阅读说明：本技术 换热器和多制冷系统空调机组 (Heat exchanger and multi-refrigerating-system air conditioning unit ) 是由 钟笑鸣 蒋建龙 高强 于 2019-06-28 设计创作，主要内容包括：本发明公开了一种换热器和多制冷系统空调机组,根据本发明实施例的换热器包括第一集流管、第二集流管、第三集流管、第四集流管、换热管和翅片,换热管包括第一换热管和第二换热管,第一换热管和所述第二换热管沿集流管的长度方向交替布置,第一换热管和/或第二换热管具有折弯段且包括第一段、中间段和第二段,所述换热器包括第一部分、中间部分和第二部分,所述换热器的中间部分包括所述中间段和所述翅片,所述换热器的第一部分包括所述第一段,流经所述换热器的气流先后通过所述换热器的中间部分和所述换热器的第一部分,或先后通过所述换热器的第一部分和所述换热器的中间部分。本发明的换热器提高了换热面积利用率。(The invention discloses a heat exchanger and a multi-refrigerating system air conditioning unit, the heat exchanger according to the embodiment of the invention comprises a first collecting pipe, a second collecting pipe, a third collecting pipe, a fourth collecting pipe, heat exchange pipes and fins, the heat exchange pipes comprise a first heat exchange pipe and a second heat exchange pipe, the first heat exchange pipe and the second heat exchange pipe are alternately arranged along the length direction of the collecting pipes, the first heat exchange pipe and/or the second heat exchange pipe are/is provided with a bending section and comprise a first section, a middle section and a second section, the heat exchanger comprising a first portion, an intermediate portion and a second portion, the intermediate portion of the heat exchanger comprising the intermediate section and the fins, the first portion of the heat exchanger comprises the first section, and the gas flow flowing through the heat exchanger passes through the intermediate portion of the heat exchanger and the first portion of the heat exchanger in sequence, or passes through the first portion of the heat exchanger and the intermediate portion of the heat exchanger in sequence. The heat exchanger improves the utilization rate of the heat exchange area.)

1. A heat exchanger, comprising:

the first collecting pipe and the second collecting pipe are arranged in parallel;

the third collecting pipe and the fourth collecting pipe are arranged in parallel, the third collecting pipe and the first collecting pipe are arranged in parallel, and the fourth collecting pipe and the second collecting pipe are arranged in parallel;

the heat exchange tubes comprise a plurality of first heat exchange tubes arranged in parallel and a plurality of second heat exchange tubes arranged in parallel, the first heat exchange tubes and the second heat exchange tubes are alternately arranged along the length direction of the first collecting pipe, one end of each first heat exchange tube is connected with the corresponding first collecting pipe, the other end of each first heat exchange tube is connected with the corresponding second collecting pipe to communicate the corresponding first collecting pipe and the corresponding second collecting pipe, one end of each second heat exchange tube is connected with the corresponding third collecting pipe, and the other end of each second heat exchange tube is connected with the corresponding fourth collecting pipe to communicate the corresponding third collecting pipe and the corresponding fourth collecting pipe;

the fins are arranged between the adjacent heat exchange tubes, and at least two fins are arranged between the adjacent first heat exchange tube and the second heat exchange tube along the length direction of the first collecting pipe;

at least one of the first heat exchange tube and the second heat exchange tube is provided with a bending section and comprises a first section, a middle section and a second section, the bending section comprises a first bending section and a second bending section, the first section is connected with the middle section through the first bending section, the second section is connected with the middle section through the second bending section,

the heat exchanger comprises a first portion, an intermediate portion and a second portion, the intermediate portion of the heat exchanger comprises the intermediate section and the fins, the first portion of the heat exchanger comprises the first section, and the airflow flowing through the heat exchanger passes through the intermediate portion of the heat exchanger and the first portion of the heat exchanger in sequence, or passes through the first portion of the heat exchanger and the intermediate portion of the heat exchanger in sequence.

2. A heat exchanger according to claim 1, wherein the second portion of the heat exchanger comprises the second section, and the gas stream flowing through the heat exchanger passes through the intermediate portion of the heat exchanger and the second portion of the heat exchanger in succession, or passes through the second portion of the heat exchanger and the intermediate portion of the heat exchanger in succession, and passes through the first portion of the heat exchanger and the second portion of the heat exchanger in parallel.

3. The heat exchanger according to claim 1, wherein the first heat exchange tube has the bent section, the first section, the intermediate section, and the second section, one end of the first section of the first heat exchange tube is connected to the first header, and the other end of the first section of the first heat exchange tube is connected to the first bent section;

one end of the second section of the first heat exchange tube is connected with the second collecting pipe, and the other end of the second section of the first heat exchange tube is connected with the second bending section.

4. The heat exchanger of claim 3, wherein the first header and the second header are located on the same side of the middle section of the first heat exchange tube in a width direction of the middle section of the first heat exchange tube.

5. The heat exchanger of claim 3, wherein the first header and the second header are located on different sides of the middle section of the first heat exchange tube in a width direction of the middle section of the first heat exchange tube.

6. The heat exchanger according to any one of claims 3 to 5, wherein the second heat exchange tube has the bent section, the first section, the intermediate section, and the second section, one end of the first section of the second heat exchange tube is connected to the third header, and the other end of the first section of the second heat exchange tube is connected to the first bent section;

one end of the second section of the second heat exchange tube is connected with the fourth collecting pipe, and the other end of the second section of the second heat exchange tube is connected with the second bending section.

7. The heat exchanger according to claim 6, wherein the third header and the fourth header are located on the same side of the middle section of the second heat exchange tube in the width direction of the middle section of the second heat exchange tube.

8. The heat exchanger of claim 6, wherein the third header and the fourth header are located on different sides of the intermediate section of the second heat exchange tube in a width direction of the intermediate section of the second heat exchange tube.

9. The heat exchanger according to claim 8, wherein the first header and the fourth header are located on the same side of the middle section of the first heat exchange tube in the width direction of the middle section of the first header, and the second header and the third header are located on the same side of the middle section of the first heat exchange tube in the width direction of the middle section of the first header.

10. The heat exchanger of claim 1, wherein the intermediate section includes a first end and a second end disposed opposite to each other in a length direction of the intermediate section, at least one of the first heat exchange tube and the second heat exchange tube further includes a third section, a fourth section, a fifth section, and a sixth section, the bending section further includes a third bending section, a fourth bending section, a fifth bending section, and a sixth bending section, the first end of the intermediate section is connected to the third section through the third bending section, the third section is connected to the fourth section through the fourth bending section, the fourth section is connected to the first section through the first bending section, the fourth section is parallel to the intermediate section, and the third section is inclined to the intermediate section,

the second end of interlude with the fifth section passes through the fifth section links to each other, the fifth section with the sixth section passes through the sixth section links to each other, the sixth section with the second section passes through the second section links to each other, the sixth section with the interlude is parallel, the fifth section slope in the interlude.

11. The heat exchanger according to any one of claims 1 to 10, wherein the first heat exchange tube has a width smaller than a width of the second heat exchange tube.

12. The heat exchanger as recited in claim 11 wherein the fin between the first heat exchange tube and the second heat exchange tube has a length in the width direction of the second heat exchange tube equal to or greater than the width of the second heat exchange tube.

13. A multi-refrigeration-system air conditioning unit, characterized by comprising a first refrigeration system and a second refrigeration system, wherein the first refrigeration system and the second refrigeration system share at least one heat exchanger, the heat exchanger is a heat exchanger according to any one of claims 1 to 12, the first collecting pipe and the second collecting pipe are respectively connected with a pipeline of the first refrigeration system, and the third collecting pipe and the fourth collecting pipe are respectively connected with a pipeline of the second refrigeration system.

14. The multi-refrigerant-system air conditioning unit as set forth in claim 13, comprising a refrigerant having a flow direction in the first section opposite to a flow direction of the refrigerant in the middle section, and having a flow direction in the second section opposite to the flow direction of the refrigerant in the middle section.

Technical Field

The invention relates to the technical field of heat exchange, in particular to a heat exchanger and a multi-refrigerating-system air conditioning unit with the same.

Background

Multiple refrigerant system air conditioners employ multiple separate refrigerant circuits. In order to adapt to the multi-refrigeration system air conditioner, the heat exchanger in the refrigerant loop is a multi-system heat exchanger.

Disclosure of Invention

Therefore, the invention provides the heat exchanger which is applied to the multi-refrigeration air conditioning unit and can improve the utilization rate of the heat exchange area on the premise of improving the uniformity of the outlet air temperature.

The invention further provides an air conditioning unit with multiple refrigeration systems.

A heat exchanger according to an embodiment of the first aspect of the invention comprises: the first collecting pipe and the second collecting pipe are arranged in parallel; the third collecting pipe and the fourth collecting pipe are arranged in parallel, the third collecting pipe and the first collecting pipe are arranged in parallel, and the fourth collecting pipe and the second collecting pipe are arranged in parallel; the heat exchange tubes comprise a plurality of first heat exchange tubes arranged in parallel and a plurality of second heat exchange tubes arranged in parallel, the first heat exchange tubes and the second heat exchange tubes are alternately arranged along the length direction of the first collecting pipe, one end of each first heat exchange tube is connected with the corresponding first collecting pipe, the other end of each first heat exchange tube is connected with the corresponding second collecting pipe to communicate the corresponding first collecting pipe and the corresponding second collecting pipe, one end of each second heat exchange tube is connected with the corresponding third collecting pipe, and the other end of each second heat exchange tube is connected with the corresponding fourth collecting pipe to communicate the corresponding third collecting pipe and the corresponding fourth collecting pipe; the fins are arranged between the adjacent heat exchange tubes, and at least two fins are arranged between the adjacent first heat exchange tube and the second heat exchange tube along the length direction of the first collecting pipe; at least one of the first heat exchange tube and the second heat exchange tube is provided with a bending section and comprises a first section, an intermediate section and a second section, the bending section comprises a first bending section and a second bending section, the first section is connected with the intermediate section through the first bending section, the second section is connected with the intermediate section through the second bending section, the heat exchanger comprises a first part, an intermediate part and a second part, the intermediate part of the heat exchanger comprises the intermediate section and the fins, the first part of the heat exchanger comprises the first section, and airflow flowing through the heat exchanger passes through the intermediate part of the heat exchanger and the first part of the heat exchanger or passes through the first part of the heat exchanger and the intermediate part of the heat exchanger.

According to the heat exchanger provided by the embodiment of the invention, the fins and the middle section of the first heat exchange tube and/or the middle section of the second heat exchange tube are/is used as the middle part of the heat exchanger, the first section of the first heat exchange tube and/or the first section of the second heat exchange tube are/is used as the first part of the heat exchanger, and the airflow flowing through the heat exchanger sequentially passes through the middle part of the heat exchanger and the first part of the heat exchanger or sequentially passes through the first part of the heat exchanger and the middle part of the heat exchanger, so that the utilization rate of a heat exchange area can be improved on the premise of improving the uniformity of the outlet.

In some embodiments, the second portion of the heat exchanger comprises the second section, and the gas stream flowing through the heat exchanger passes through the intermediate portion of the heat exchanger and the second portion of the heat exchanger in succession, or passes through the second portion of the heat exchanger and the intermediate portion of the heat exchanger in succession, and passes through the first portion of the heat exchanger and the second portion of the heat exchanger in parallel.

In some embodiments, the first heat exchange tube has the bent section, the first section, the middle section, and the second section, one end of the first section of the first heat exchange tube is connected to the first header, and the other end of the first section of the first heat exchange tube is connected to the first bent section;

one end of the second section of the first heat exchange tube is connected with the second collecting pipe, and the other end of the second section of the first heat exchange tube is connected with the second bending section.

In some embodiments, the first header and the second header are located on the same side of the middle section of the first heat exchange tube in the width direction of the middle section of the first heat exchange tube.

In some embodiments, the first header and the second header are located at different sides of the middle section of the first heat exchange tube in a width direction of the middle section of the first heat exchange tube.

In some embodiments, the second heat exchange tube has the bent section, the first section, the middle section, and the second section, one end of the first section of the second heat exchange tube is connected to the third header, and the other end of the first section of the second heat exchange tube is connected to the first bent section;

one end of the second section of the second heat exchange tube is connected with the fourth collecting pipe, and the other end of the second section of the second heat exchange tube is connected with the second bending section.

In some embodiments, the third header and the fourth header are located on the same side of the middle section of the second heat exchange tube in the width direction of the middle section of the second heat exchange tube.

In some embodiments, the third header and the fourth header are located on different sides of the middle section of the second heat exchange tube in a width direction of the middle section of the second heat exchange tube.

In some embodiments, the first collecting pipe and the fourth collecting pipe are located on the same side of the middle section of the first heat exchange pipe along the width direction of the middle section of the first collecting pipe, and the second collecting pipe and the third collecting pipe are located on the same side of the middle section of the first heat exchange pipe along the width direction of the middle section of the first collecting pipe.

In some embodiments, the intermediate section includes a first end and a second end that are oppositely disposed in a length direction of the intermediate section, at least one of the first heat exchange tube and the second heat exchange tube further includes a third section, a fourth section, a fifth section, and a sixth section, the bending section further includes a third bending section, a fourth bending section, a fifth bending section, and a sixth bending section, the first end of the intermediate section is connected to the third section through the third bending section, the third section is connected to the fourth section through the fourth bending section, the fourth section is connected to the first section through the first bending section, the fourth section is parallel to the intermediate section, and the third section is inclined to the intermediate section,

the second end of interlude with the fifth section passes through the fifth section links to each other, the fifth section with the sixth section passes through the sixth section links to each other, the sixth section with the second section passes through the second section links to each other, the sixth section with the interlude is parallel, the fifth section slope in the interlude.

In some embodiments, the first heat exchange tube has a width less than a width of the second heat exchange tube.

In some embodiments, the length of the fin between the first heat exchange tube and the second heat exchange tube in the width direction of the second heat exchange tube is greater than or equal to the width of the second heat exchange tube.

The multi-refrigeration-system air conditioning unit according to the embodiment of the second aspect of the present invention includes a first refrigeration system and a second refrigeration system, where the first refrigeration system and the second refrigeration system share at least one heat exchanger, the heat exchanger is the heat exchanger according to any of the above embodiments, the first collecting pipe and the second collecting pipe are respectively connected to a pipeline of the first refrigeration system, and the third collecting pipe and the fourth collecting pipe are respectively connected to a pipeline of the second refrigeration system.

In some embodiments, the multi-refrigerant-system air conditioning unit includes a refrigerant, a flow direction of the refrigerant in the first section is opposite to a flow direction of the refrigerant in the middle section, and a flow direction of the refrigerant in the second section is opposite to the flow direction of the refrigerant in the middle section.

Drawings

FIG. 1 is a front view of a heat exchanger according to one embodiment of the present invention.

Fig. 2 is a top view of the heat exchanger of fig. 1.

Fig. 3 is a schematic structural view of the heat exchange tube of fig. 1.

Fig. 4 is a front view of a heat exchanger according to another embodiment of the present invention.

Fig. 5 is a schematic structural view of the heat exchange tube of fig. 4.

Fig. 6 is a front view of a heat exchanger according to still another embodiment of the present invention.

Fig. 7 is a top view of the heat exchanger of fig. 6.

Fig. 8 is a schematic structural view of a part of the heat exchange tube in fig. 6.

Fig. 9 is a front view of a heat exchanger according to yet another embodiment of the present invention.

Fig. 10 is a schematic structural view of a part of the heat exchange tube in fig. 9.

Fig. 11 is a front view of a heat exchanger according to another embodiment of the present invention.

Fig. 12 is a front view of a heat exchanger according to still another embodiment of the present invention.

Fig. 13 is a front view of a heat exchanger according to yet another embodiment of the present invention.

Fig. 14 is a top view of the heat exchanger of fig. 13.

Fig. 15 is a schematic structural view of the heat exchange tube of fig. 13.

Fig. 16 is a partial structural schematic view of the heat exchange tube of fig. 13.

Fig. 17 is a front view of a heat exchanger according to yet another embodiment of the present invention.

Fig. 18 is a top view of the heat exchanger of fig. 17.

Fig. 19 is a front view of a heat exchanger according to yet another embodiment of the present invention.

Fig. 20 is a top view of the heat exchanger of fig. 19.

Fig. 21 is a schematic view of the header of fig. 19.

Fig. 22 is a schematic diagram of a multi-refrigerant system air conditioning unit according to an embodiment of the present invention.

Fig. 23 is a schematic structural view of a portion of a heat exchange tube according to an embodiment of the present invention, showing one exemplary structure of a fin.

Fig. 24 is a schematic structural view of a portion of a heat exchange tube according to an embodiment of the present invention, showing another exemplary configuration of fins.

Reference numerals:

the heat exchanger 100, the first header 1, the second header 2, the third header 3, the fourth header 4, the heat exchange tube 5, the first heat exchange tube 501, the second heat exchange tube 502, the first section 51, the first longitudinal side 511 of the first section, the first side 5111, the second longitudinal side 512 of the first section, the middle section 52, the first longitudinal side 521 of the middle section, the middle side 5211, the second longitudinal side 522 of the middle section, the second section 53, the first longitudinal side 531 of the second section, the second side 5311, the second longitudinal side 532 of the second section, the bent section 54, the first bent section 541, the second bent section 542, the third bent section 543, the fourth bent section 545, the fifth bent section 546, the sixth bent section 547, the second section 55, the fourth section 56, the fifth section 57, the sixth section 58, the twisted section 59, the first twisted section 591, the second twisted section 592,

the air conditioning unit with multiple refrigeration systems 200, a compressor 210, a condenser 220, a throttling device 230 and an evaporator 240.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or fixture in question must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered as limiting.

As shown in fig. 1 to 21, a heat exchanger 100 according to an embodiment of the present invention includes a first header 1, a second header 2, a third header 3, a fourth header 4, a heat exchange tube 5, and a fin 6.

The first collecting pipe 1 and the second collecting pipe 2 are arranged in parallel, the third collecting pipe 3 and the fourth collecting pipe 4 are arranged in parallel, the third collecting pipe 3 and the first collecting pipe 1 are arranged in parallel, and the fourth collecting pipe 4 and the second collecting pipe 2 are arranged in parallel. As shown in fig. 2, the first header 1, the second header 2, the third header 3, and the fourth header 4 all extend in the vertical direction. As shown in fig. 1, the first header 1 and the second header 2 are arranged at an interval in the left-right direction. The third header 3 and the fourth header 4 are arranged at an interval in the left-right direction.

The heat exchange tube 5 includes a plurality of first heat exchange tubes 501 and a plurality of second heat exchange tubes 502, the plurality of first heat exchange tubes 501 are arranged in parallel, the plurality of second heat exchange tubes 502 are arranged in parallel, and the first heat exchange tubes 501 and the second heat exchange tubes 502 are arranged in parallel. As shown in fig. 2, the plurality of heat exchange tubes 5 are arranged at intervals in the up-down direction and include a plurality of first heat exchange tubes 501 and a plurality of second heat exchange tubes 502. Each of the first heat exchange tubes 501 and each of the second heat exchange tubes 502 extend in the left-right direction, the plurality of first heat exchange tubes 501 are arranged at intervals in the up-down direction, the plurality of second heat exchange tubes 502 are arranged at intervals in the up-down direction, and the first heat exchange tubes 501 and the second heat exchange tubes 502 are arranged at intervals in the up-down direction.

The first heat exchange tubes 501 and the second heat exchange tubes 502 are alternately arranged along the length direction of the first header 1. As shown in fig. 2, the first heat exchange tubes 501 and the second heat exchange tubes 502 are alternately arranged in the up-down direction (the direction in which the length of the header extends). It should be noted here that the "alternate arrangement" should be understood in a broad sense. For example, one or more second heat exchange pipes 502 may be disposed between two adjacent first heat exchange pipes 501; one or more first heat exchange tubes 501 may be disposed between two adjacent second heat exchange tubes 502; further, the plurality of first heat exchange tubes 501 may be divided into a plurality of first heat exchange tube groups, each of which may include at least two first heat exchange tubes 501, and the plurality of second heat exchange tubes 502 may be divided into a plurality of second heat exchange tube groups, each of which may include at least two second heat exchange tubes 502, and the first heat exchange tubes may be alternately arranged with the second heat exchange tubes.

One end of the first heat exchange tube 501 is connected to the first collecting pipe 1, and the other end of the first heat exchange tube 501 is connected to the second collecting pipe 2, so as to communicate the first collecting pipe 1 and the second collecting pipe 2. In other words, a plurality of first heat exchange tubes 501 are connected between the first header 1 and the second header 2 to communicate the first header 1 and the second header 2.

One end of the second heat exchange tube 502 is connected to the third collecting main 3, and the other end of the second heat exchange tube 502 is connected to the fourth collecting main 4 to communicate the third collecting main 3 and the fourth collecting main 4. In other words, a plurality of second heat exchange tubes 502 are connected between the third header 3 and the fourth header 4 to communicate the third header 3 and the fourth header 4.

Fins 6 are arranged between the adjacent heat exchange tubes 5, and at least two fins 6 are arranged between the adjacent first heat exchange tube 501 and second heat exchange tube 502 along the length direction of the first header 1. The arrangement of the fins 6 can improve the heat exchange area of the two adjacent heat exchange tubes 5, and the heat exchange efficiency of each heat exchanger is improved. It is understood that the first heat exchange pipe 501 and the second heat exchange pipe 502 share the fin 6.

At least one of the first heat exchange tube 501 and the second heat exchange tube 502 is provided with a bending section 54, the at least one comprises a first section 51, an intermediate section 52 and a second section 53, the bending section 54 comprises a first bending section 541 and a second bending section 542, the first section 51 is communicated with the intermediate section 52 through the first bending section 541, and the second section 53 is communicated with the intermediate section 52 through the second bending section 542. In other words, at least one of the first heat exchange pipe 501 and the second heat exchange pipe 502 is bent at both sides in the longitudinal direction before being bent to form a bent pipe.

The heat exchanger 100 comprises a first section, an intermediate section and a second section, wherein the intermediate section of the heat exchanger 100 comprises the intermediate section 52 and the fins 6, and the first section of the heat exchanger 100 comprises the first section 51. In other words, the intermediate section 52 of the first heat exchange tube 501 and/or the intermediate section 52 of the second heat exchange tube 502 and the fin 6 serve as the intermediate portion of the heat exchanger 100, and the first section 51 of the first heat exchange tube 501 and/or the first section 51 of the second heat exchange tube 502 serve as the first portion of the heat exchanger 100.

Wherein the gas stream flowing through heat exchanger 100 may pass through the intermediate portion and the first portion of heat exchanger 100 sequentially, or through the first portion and the intermediate portion of heat exchanger 100 sequentially. In other words, the gas stream flowing through the heat exchanger 100 passes through the middle portion of the heat exchanger 100 before passing through the first portion of the heat exchanger 100, or passes through the first portion of the heat exchanger 100 before passing through the middle portion of the heat exchanger 100.

According to the heat exchanger 100 of the embodiment of the invention, the fin 6 and the intermediate section 52 of the first heat exchange tube 501 and/or the intermediate section 52 of the second heat exchange tube 502 are used as the intermediate part of the heat exchanger 100, the first section 51 of the first heat exchange tube 501 and/or the first section 51 of the second heat exchange tube 502 are used as the first part of the heat exchanger 100, and the airflow flowing through the heat exchanger 100 passes through the intermediate part of the heat exchanger 100 and the first part of the heat exchanger 100 in sequence or passes through the first part of the heat exchanger 100 and the intermediate part of the heat exchanger 100 in sequence, so that the utilization rate of heat exchange area can be improved on the premise of improving the uniformity of the outlet air temperature.

It can be understood that, in the heat exchanger 100 of the present invention, the first collecting pipe 1, the first heat exchange tube 501 and the second collecting pipe 2 form a first system, and the third collecting pipe 3, the second heat exchange tube 502 and the fourth collecting pipe 4 form a second system, wherein the first system and the second system can work at the same time, that is, run at full load, so as to meet the requirement of the air conditioner for high-load operation; one of the first system and the second system may also be operated, i.e., part load operation, to meet the low load operation requirements of the air conditioner.

The heat exchanger 100 can thus be applied to a multi-refrigerant system air conditioning unit having a plurality of refrigerant systems. Moreover, by the alternative arrangement of the first heat exchange tubes 501 and the second heat exchange tubes 502, the heat exchange area of each system is substantially the same as the whole heat exchange area of the heat exchanger, that is, the heat exchange area in a partial load operation state is substantially the same as the heat exchange area in a full load operation state, so that the utilization rate of the heat exchange area is improved, and the heat exchange effect and the energy efficiency of the multi-channel heat exchanger in partial load operation are also improved. Meanwhile, the temperature of the air after heat exchange is more uniform, and the phenomenon of local condensation is avoided. Moreover, the heat exchanger has a compact structure and saves space.

In some embodiments, the second portion of the heat exchanger 100 includes the second section 53. In other words, the second section 53 of the first heat exchange tube 501 and/or the second section 53 of the second heat exchange tube 502 serve as the second portion of the heat exchanger 100.

The gas stream flowing through heat exchanger 100 passes through the intermediate portion of heat exchanger 100 and the second portion of heat exchanger 100 in series, or passes through the second portion of heat exchanger 100 and the intermediate portion of heat exchanger 100 in series, and passes through the first portion of heat exchanger 100 and the second portion of heat exchanger 100 in parallel. In other words, the gas flow through the heat exchanger 100 passes through the middle portion of the heat exchanger 100 before passing through the second portion of the heat exchanger 100, or passes through the second portion of the heat exchanger 100 before passing through the middle portion of the heat exchanger 100, and the gas flow passes through the first portion and the second portion of the heat exchanger 100 in parallel.

It should be noted here that the first portion of the heat exchanger 100 and the second portion of the heat exchanger 100 do not overlap in the direction of the gas flow, and the gas flow does not pass through the first portion and the second portion of the heat exchanger 100 in sequence, or passes through the second portion and the first portion of the heat exchanger 100 in sequence, but passes through the first portion and the second portion of the heat exchanger 100 in parallel.

In some embodiments, the heat exchange tube 5 includes a first longitudinal side and a second longitudinal side, wherein the first longitudinal side and the second longitudinal side each extend in a direction parallel to the longitudinal direction of the heat exchange tube 5 and are arranged oppositely in the thickness direction of the heat exchange tube 5 (the direction in which the length of the header extends, i.e., the up-down direction in fig. 2). As shown in fig. 2 and 3, the heat exchange tube 5 includes upper and lower sides that are oppositely arranged in the up-down direction.

It is to be understood that, as shown in fig. 3, the first segment 51 includes a first side surface 511 and a second side surface which are oppositely arranged in the thickness direction of the first segment 51, the intermediate segment 52 includes a first side surface 521 and a second side surface which are oppositely arranged in the thickness direction of the intermediate segment 52, and the second segment 53 includes a first side surface 531 and a second side surface which are oppositely arranged in the thickness direction of the second segment 53.

Wherein the first longitudinal side 511 of the first section 51 is arranged parallel to the first longitudinal side 521 of the intermediate section 52 and the first longitudinal side 531 of the second section 53 is arranged parallel to the first longitudinal side 521 of the intermediate section 52. In other words, the first and second longitudinal sides 511, 521, 52 of the first segment 51, and 531, 53 of the second segment are all arranged in parallel.

The first longitudinal side 511 of the first segment 51 has a first side 5111 extending along the length of the first segment 51, the first longitudinal side 521 of the intermediate segment 52 has an intermediate side 5211 extending along the length of the intermediate segment 52, and the first longitudinal side 531 of the second segment 53 has a second side 5311 extending along the length of the second segment 53. An angle β 1 formed between the first side edge and the middle side edge is an acute angle, and an angle β 2 formed between the second side edge and the middle side edge is an acute angle.

In other words, the first heat exchange tube 501 and/or the second heat exchange tube 502 are bent tubes, the bent tubes have two opposite side sections in the length direction of the non-bent tubes before being bent, the two opposite side sections are bent on the longitudinal sides (the sides perpendicular to the thickness direction of the non-bent tubes) of the non-bent tubes, and are respectively folded in the direction toward the middle section 52, so as to form the first section 51, the middle section 52 and the second section 53 on the same heat exchange tube 5, such that the outer end of the first section 51 is located on one side in the width direction of the middle section 52, and the outer end of the second section 53 is located on one side or the other side in the width direction of the middle section 52.

The heat exchanger 100 is applied to a multi-refrigeration system air conditioning unit, the uniformity of air outlet can be improved, the utilization rate of a heat exchange area is improved, meanwhile, the bending positions of the first heat exchange tube 501 and/or the second heat exchange tube 502 are arranged on the first longitudinal side and the second longitudinal side of the heat exchange tube 5 which are oppositely arranged along the thickness direction, the stress area is relatively large, the stress of the heat exchange tube 5 is relatively uniform along the width direction, and the reliability of the heat exchange tube 5 and the heat exchanger 100 is improved. Moreover, the areas of the two end sections of the heat exchange tube 5 are relatively reduced, and the main body area of the heat exchange tube 5 with fins is enlarged, so that the heat exchange effect is improved. In addition, by designing the first heat exchange tube 501 and/or the second heat exchange tube 502 into the above structure, when the refrigerant flows through the bent portion of the heat exchange tube 5, the flow direction of the refrigerant is reversely changed, the local pressure drop is increased, when the heat exchanger is used as an evaporator, the mixing of the gas-liquid two-phase refrigerant can be promoted, and the refrigerant is uniformly distributed among the heat exchange tubes.

Further, the range of the angle beta 1 is more than or equal to 25 degrees and less than or equal to 85 degrees, and the range of the angle beta 2 is more than or equal to 25 degrees and less than or equal to 85 degrees and less than or equal to 25 degrees. By setting the angles beta 1 and beta 2 within the above ranges, when the refrigerant in the refrigeration system flows through the bent part of the heat exchange tube 5, the flow direction of the refrigerant is reversely changed, so that the local pressure drop is further increased, when the heat exchanger is used as an evaporator, the mixing of the gas-liquid two-phase refrigerant can be further promoted, and the refrigerant is uniformly distributed among the heat exchange tubes.

In some embodiments, the first heat exchange tube 501 has a bent section 54, a first section 51, an intermediate section 52, and a second section 53. In other words, the first heat exchange tube 501 is a bent tube.

One end of the first section 51 of the first heat exchange tube 501 is connected to the first header 1, and the other end of the first section 51 of the first heat exchange tube 501 is connected to the first bent section 541. As shown in fig. 2 and 3, the left end of the first section 51 of the first heat exchange tube 501 is connected to the first header 1, and the right end of the first section 51 of the first heat exchange tube 501 is connected to the first bent section 541.

The first section 51 of the first heat exchange tube 501 is formed by folding a section of the heat exchange tube, connected to the first header 1, of the first heat exchange tube 501, relative to the middle section 52 of the first heat exchange tube 501, and a first bent section 541 is formed at a bent position. It should be noted that the first bending section 541 is in arc transition, so that the transition arc is formed when the one-section heat exchange tube is folded with respect to the middle section 52. Through the structure, the heat exchange area formed by the middle section 51 of the first heat exchange tube 501 can be increased under the same ventilation area, and the heat exchange effect is improved. Meanwhile, the arc-shaped transition can reduce the stress concentration of the bending area of the heat exchange tube, so that the reliability of the heat exchanger is improved.

One end of the second section 53 of the first heat exchange tube 501 is connected to the second header 2, and the other end of the second section 53 of the first heat exchange tube 501 is connected to the second bent section 542. As shown in fig. 2 and 3, the right end of the second section 53 of the first heat exchange tube 501 is connected to the second header 2, and the left end of the second section 53 of the first heat exchange tube 501 is connected to the second bent section 542.

The second section 53 of the first heat exchange tube 501 is formed by folding a section of the heat exchange tube, connected to the first heat exchange tube 501 and the second header 2, over relative to the middle section 52 of the first heat exchange tube 501, and a second folded section 542 is formed at the folded position. It should be noted that the second bending section 541 is in arc transition, so that the transition arc is formed when the heat exchange tube is folded relative to the middle section 52.

In some alternative embodiments, the first header 1 and the second header 2 are located on the same side of the intermediate section 52 of the first heat exchange tube 501 in the width direction (front-to-back direction shown in fig. 1) of the intermediate section 52 of the first heat exchange tube 501.

In other words, the outer end of the first section 51 (the end of the first section 51 remote from the intermediate section 52) and the outer end of the second section 52 (the end of the second section 52 remote from the intermediate section 52) of the first heat exchange tube 501 are located on the same side in the width direction of the intermediate section 52.

As shown in fig. 1, the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 are both located at the rear side of the intermediate section 52, i.e., the first header 1 and the second header 2 are both located at the rear side of the intermediate section 52. It will be understood that the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 may also both be located at the front side of the middle section 52, i.e. the first header 1 and the second header 2 are both located at the front side of the middle section 52. By locating the first header 1 and the second header 2 on the same side of the intermediate section 51, the size of the heat exchanger 100 in the front-rear direction can be reduced, and the structural compactness can be improved.

In some specific embodiments, the second heat exchange tube 502 has a bent section 54, a first section 51, an intermediate section 52, and a second section 53. In other words, the second heat exchanging pipes 502 are also bending pipes. The third header 3 and the fourth header 4 are located on the same side of the intermediate section 52 of the second heat exchange tube 502 in the width direction of the intermediate section 52 of the second heat exchange tube 502.

In other words, the outer end of the first section 51 (the end of the first section 51 remote from the intermediate section 52) and the outer end of the second section 52 (the end of the second section 52 remote from the intermediate section 52) of the second heat exchange tube 502 are located on the same side in the width direction of the intermediate section 52.

As shown in fig. 6, the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 are both located on the front side of the intermediate section 52, i.e., the third header 3 and the fourth header 4 are both located on the front side of the intermediate section 52. It will be understood that the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 may also both be located at the rear side of the intermediate section 52, i.e. the third header 3 and the fourth header 4 are both located at the rear side of the intermediate section 52.

In some specific embodiments, the first header 1, the second header 2, the third header 3, and the fourth header 4 are located on the same side of the middle section 51 of the first heat exchange tube 501 in the width direction of the middle section 52 of the first heat exchange tube 501.

As shown in fig. 11 and 12, the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 are both located at the rear side of the middle section 52, and the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 are both located at the rear side of the middle section 52, i.e., the first header 1, the second header 2, the third header 3 and the fourth header 4 are all located at the rear side of the middle section 51. It is understood that the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 may be located at the front side of the middle section 52, and the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 may be located at the front side of the middle section 52, i.e. the first header 1, the second header 2, the third header 3 and the fourth header 4 are located at the front side of the middle section 51. Through all lieing in the same one side of interlude 51 with first pressure manifold 1, second pressure manifold 2, third pressure manifold 3 and fourth pressure manifold 4, when the simultaneous operation of multisystem, the difference of the inlet air temperature difference between the multisystem can be reduced to do benefit to the balance between each system.

Further, the angle β 1 of the first heat exchange tube 501 is different from the angle β 1 of the second heat exchange tube 502, and/or the included angle β 2 of the first heat exchange tube 501 is different from the angle β 2 of the second heat exchange tube 502.

According to the heat exchanger 100 of the embodiment of the present invention, by offsetting the outer end of the first section 51 of the first heat exchange tube 501 from the outer end of the first section 51 of the second heat exchange tube 502, that is, the angle β 1 of the first heat exchange tube 501 is different from the angle β 1 of the second heat exchange tube 502, the first header 1 and the third header 3 can be made to be installed on the same side in the width direction of the intermediate section 52. Likewise, by offsetting the outer end of the second section 53 of the first heat exchange tube 501 from the outer end of the second section 53 of the second heat exchange tube 502, i.e., the angle β 2 of the first heat exchange tube 501 is different from the angle β 2 of the second heat exchange tube 502, the second header 2 and the fourth header 4 can be made so that the second header 2 and the fourth header 4 are mounted on the same side in the width direction of the intermediate section 52.

As shown in fig. 11, the angle β 1 of the first heat exchange tube 501 is the same as the angle β 2 of the first heat exchange tube 501, the angle β 1 of the second heat exchange tube 502 is the same as the angle β 2 of the second heat exchange tube 502, and the angle β 1 of the first heat exchange tube 501 and the angle β 2 of the first heat exchange tube 501 are greater than the angle β 1 of the second heat exchange tube 502 and the angle β 2 of the second heat exchange tube 502, so that the third header 3 and the fourth header 4 are closer to the intermediate section 52 than the first header 1 and the second header 2 in the width direction of the intermediate section 52.

As shown in fig. 12, the angle β 1 of the first heat exchange tube 501 is greater than the angle β 2 of the first heat exchange tube 501, the angle β 1 of the second heat exchange tube 502 is smaller than the angle β 2 of the second heat exchange tube 502, the angle β 1 of the first heat exchange tube 501 is the same as the angle β 2 of the second heat exchange tube 501, and the angle β 2 of the first heat exchange tube 501 is the same as the angle β 1 of the second heat exchange tube 502, so that the third header 3 and the second header 2 are closer to the intermediate section 52 than the first header 1 and the fourth header 4 in the width direction of the intermediate section 52.

In other specific embodiments, the first header 1 and the second header 2 are located on one side of the middle section 52 of the first heat exchange tube 501 in the width direction of the middle section 52 of the first heat exchange tube 501, and the third header 3 and the fourth header 4 are located on the other side of the middle section 52 of the first heat exchange tube 501 in the width direction of the middle section 52 of the first heat exchange tube 501.

As shown in fig. 6 to 8, the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 are both located on the rear side of the intermediate section 52, the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 are both located on the front side of the intermediate section 52, i.e., the first header 1 and the second header 2 are located on the rear side of the intermediate section 51, and the third header 3 and the fourth header 4 are located on the front side of the intermediate section 51. It is understood that it is also possible that the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 are both located on the front side of the middle section 52, the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 are both located on the rear side of the middle section 52, i.e., the first header 1 and the second header 2 are located on the front side of the middle section 51, and the third header 3 and the fourth header 4 are located on the rear side of the middle section 51. By locating the first header 1 and the second header 2 at the front side of the middle section 51 and the third header 3 and the fourth header 4 at the rear side of the middle section 51, the uniformity of the outlet air temperature can be improved when each system works independently.

Further, the angle β 1 of the first heat exchange tube 501 is the same as the angle β 1 of the second heat exchange tube 502, and/or the angle β 2 of the first heat exchange tube 501 is the same as the angle β 2 of the second heat exchange tube 502.

Further, the angle β 1 of the first heat exchange tube 501 is the same as the angle β 2 of the first heat exchange tube 501, the angle β 1 of the second heat exchange tube 502 is the same as the angle β 2 of the second heat exchange tube 502, and the angle β 1 of the first heat exchange tube 501 is the same as the angle β 2 of the first heat exchange tube 501 and the angle β 1 of the second heat exchange tube 502 is the same as the angle β 2 of the second heat exchange tube 502.

In other alternative embodiments, the first heat exchange tube 501 has a bent section, a first section 51, an intermediate section 52, and a second section 53. In other words, the first heat exchange tubes 501 are all bent tubes. The first header 1 and the second header 2 are located on different sides of the intermediate section 52 of the first heat exchange tube 501 in the width direction of the intermediate section 52 of the first heat exchange tube 501.

In other words, the outer end of the first section 51 (the end of the first section 51 remote from the intermediate section 52) and the outer end of the second section 52 (the end of the second section 52 remote from the intermediate section 52) of the first heat exchange tube 501 are located on different sides in the width direction of the intermediate section 52.

As shown in fig. 4, 5 and 9, the outer end of the first section 51 of the first heat exchange tube 501 is located at the rear side of the middle section 52, the outer end of the second section 52 is located at the front side of the middle section 52, i.e. the first header 1 is located at the rear side of the middle section 52, and the second header 2 is located at the front side of the middle section 52. It is understood that the outer end of the first section 51 of the first heat exchange tube 501 may be located at the front side of the middle section 52, the outer end of the second section 52 may be located at the rear side of the middle section 52, that is, the first header 1 is located at the front side of the middle section 52, and the second header 2 is located at the rear side of the middle section 52. Through being located the rear side of interlude 52 with first pressure manifold 1, second pressure manifold 2 is located the front side of interlude 52, perhaps is located the front side of interlude 52 with first pressure manifold 1, and second pressure manifold 2 is located the rear side of interlude 52, can design the air current direction of single system work, and designs the refrigerant flow direction and be countercurrent or following current, improves the heat transfer effect.

In some specific embodiments, the second heat exchange tube 502 has a bent section, a first section 51, an intermediate section 52, and a second section 53. In other words, the second heat exchanging pipes 502 are also bending pipes. The third header 3 and the fourth header 4 are located on different sides of the intermediate section 52 of the second heat exchange tube 502 in the width direction of the intermediate section 52 of the second heat exchange tube 502.

In other words, the outer end of the first section 51 (the end of the first section 51 remote from the intermediate section 52) and the outer end of the second section 52 (the end of the second section 52 remote from the intermediate section 52) of the second heat exchange tube 501 are located on different sides in the width direction of the intermediate section 52.

As shown in fig. 9, the outer end of the first section 51 of the second heat exchange tube 501 is located at the front side of the middle section 52, the outer end of the second section 52 is located at the rear side of the middle section 52, i.e. the third header 3 is located at the front side of the middle section 52, and the fourth header 4 is located at the rear side of the middle section 52. It is understood that the outer end of the first section 51 of the second heat exchange tube 501 is located at the rear side of the middle section 52, the outer end of the second section 52 is located at the front side of the middle section 52, i.e. the third header 3 is located at the rear side of the middle section 52, and the fourth header 4 is located at the front side of the middle section 52.

In some specific embodiments, the first header 1 and the fourth header 4 are located on the same side of the middle section 51 of the first heat exchange tube 501 in the width direction of the middle section of the first heat exchange tube 501, and the second header 2 and the third header 3 are located on the same side of the middle section 51 of the first heat exchange tube 501 in the width direction of the middle section 51 of the first heat exchange tube 501.

As shown in fig. 9, the outer end of the first section 51 of the first heat exchange tube 501 is located at the rear side of the intermediate section 52, and the outer end of the second section 52 of the second heat exchange tube 501 is located at the rear side of the intermediate section 52, i.e., the first header 1 and the fourth header 4 are both located at the rear side of the intermediate section 51. The outer end of the second section 52 of the first heat exchange tube 501 is located at the front side of the middle section 52, and the outer end of the first section 51 of the second heat exchange tube 501 is located at the front side of the middle section 52, i.e. the second header 2 and the third header 3 are both located at the front side of the middle section 51. Through all being located the rear side of interlude 51 with first pressure manifold 1 and fourth pressure manifold 4, second pressure manifold 2 and third pressure manifold 3 all are located the front side of interlude 51, perhaps all are located the front side of interlude 51 with first pressure manifold 1 and fourth pressure manifold 4, and second pressure manifold 2 and third pressure manifold 3 all are located the rear side of interlude 51, when dual system simultaneous working, are favorable to the performance balance between the dual system.

In some embodiments, as shown in fig. 15 and 16, the intermediate section 52 comprises a first end (left end of the intermediate section 52 shown in fig. 15) and a second end (right end of the intermediate section 52 shown in fig. 15) opposite in the length direction of the intermediate section 52, the first heat exchange tube 501 further comprises a third section 55, a fourth section 56, a fifth section 57 and a sixth section 58, and the bending section 54 further comprises a third bending section 543, a fourth bending section 544, a fifth bending section 545 and a sixth bending section 546.

The first end of the middle section 52 is connected to the third section 55 through the third bending section 543, the third section 55 is connected to the fourth section 56 through the fourth bending section 544, and the fourth section 56 is connected to the first section 51 through the first bending section 541. And the first longitudinal side of the fourth segment 56 is parallel to the first longitudinal side of the intermediate segment 52, which is oblique to the first longitudinal side 521 of the intermediate segment 52.

As shown in fig. 15 and 16, the left end of the middle section 52 is connected to the third bending section 543, the right end of the third section 55 is connected to the third bending section 543, the left end of the third section 55 is connected to the fourth bending section 544, the right end of the fourth section 56 is connected to the fourth bending section 544, and the left end of the fourth section 56 is connected to the first bending section 541. Wherein the third section 55 is inclined to the front side with respect to the intermediate section 52 to space the fourth section 56 and the intermediate section 52 in the front-rear direction, and the fourth section 56 and the intermediate section 52 are arranged in parallel.

The second end of the middle segment 52 communicates with the fifth segment 57 through a fifth bending segment 545, the fifth segment 57 communicates with the sixth segment 58 through a sixth bending segment 546, and the sixth segment 58 communicates with the second segment 53 through a second bending segment 542. And the first longitudinal side of the sixth section 58 is parallel to the first longitudinal side of the intermediate section 52 and the first longitudinal side of the fifth section is oblique to the first longitudinal side of the intermediate section 52.

As shown in fig. 15, the right end of the middle section 52 is connected to the fifth bending section 545, the left end of the fifth section 57 is connected to the fifth bending section 545, the right end of the fifth section 57 is connected to the sixth bending section 546, the left end of the sixth section 58 is connected to the sixth bending section 546, and the right end of the sixth section 58 is connected to the second bending section 542. Wherein the fifth section 57 is inclined to the front side with respect to the intermediate section 52 to space the sixth section 58 and the intermediate section 52 in the front-rear direction, and the sixth section 58 and the intermediate section 52 are arranged in parallel.

Further, the fourth segment 56 and the sixth segment 58 are aligned in the left-right direction.

In the embodiment shown in fig. 15 and 16, by providing a plurality of bending sections, the stress concentration can be further improved, and the reliability of the heat exchanger can be improved.

In some embodiments, the width of the first heat exchange tube 501 is different from the width of the second heat exchange tube 502. As shown in fig. 17, the first heat exchange pipe 501 has a width smaller than that of the second heat exchange pipe 502.

Further, the first heat exchange tube 501 is a bent tube, and the second heat exchange tube 501 is a straight tube. The width that can understand is less than the straight tube of bending, and the heat exchange tube that bends promptly adopts the heat exchange tube that the width is less, does benefit to realizing bending of heat exchange tube, improves the heat exchanger reliability, can adapt to the difference of first system and second system heat transfer volume simultaneously to realize the differentiation of different systems and match.

In some specific embodiments, the length of the fin 6 between the first heat exchange tube 501 and the second heat exchange tube 502 in the width direction of the second heat exchange tube 502 is equal to or greater than the width of the second heat exchange tube 502, thereby increasing the heat exchange area on the air side.

It will be understood that the fin 6 between the first heat exchange tube 501 and the second heat exchange tube 502 may be a corrugated fin, as shown in fig. 23, extending along the length of the intermediate section 51 of the heat exchange tube 5, a cross fin, as shown in fig. 24, or other type of fin.

In some embodiments, the first section 51 and/or the second section 53 in at least one of the first heat exchange tube 501 and the second heat exchange tube 502 are twisted to form a twisted section 59, wherein the first section 51 is twisted about the length of the first section 51 to form a first twisted section 591, and the second section 53 is twisted about the length of the second section 53 to form a second twisted section 592.

As shown in fig. 19 and 20, the first heat exchange tube 501 is a bent tube, the second heat exchange tube 502 is a straight tube, the first section 51 of the first heat exchange tube 501 is twisted to form a first twisted section 591, and the second section 53 of the first heat exchange tube 501 is twisted to form a second twisted section 592.

Further, as shown in fig. 21, the diameter of the first header 1 is the same as that of the second header 2, the diameter of the third header 3 is the same as that of the fourth header 4, and the diameter of the first header 1 and the diameter of the second header 2 are smaller than those of the third header 3 and the fourth header 4. Therefore, the diameter of part of the collecting pipes can be reduced, and the effective heat exchange area is increased by reducing the diameter of the collecting pipes.

A multi refrigerant system air conditioning unit according to an embodiment of the present invention will be described with reference to fig. 22.

The multi-refrigeration-system air conditioning unit 200 according to the embodiment of the invention comprises a plurality of refrigeration systems, wherein the plurality of refrigeration systems comprise a first refrigeration system and a second refrigeration system, the first refrigeration system and the second refrigeration system share at least one heat exchanger, the heat exchanger is an evaporator and/or a condenser of the first refrigeration system and the second refrigeration system, and the heat exchanger is the heat exchanger 100 according to any one of the embodiments.

More specifically, the plurality of refrigeration systems includes a plurality of compressors 210, condensers 220, a plurality of throttle devices 230, evaporators 240, wherein at least two refrigeration systems share one condenser 220 or one evaporator 240.

The following description will be given by taking a dual refrigeration system air conditioning unit as an example, but the present invention is not limited thereto.

As shown in fig. 22, the dual refrigerant system air conditioning unit 2 includes two compressors 210, two condensers 220, two throttle devices 230, and one evaporator 240. In other words, the two refrigeration systems are the first refrigeration system and the second refrigeration system respectively, and share one evaporator 240, the evaporator 240 is the heat exchanger 1 according to the embodiment of the present invention, and the throttling device 230 may be an expansion valve.

The first refrigeration system includes a compressor 210, a condenser 220, and an expansion valve, wherein the compressor 210, the condenser 220, and the expansion valve are connected in series in sequence, and the expansion valve and the compressor 210 are respectively connected to a first collecting pipe 1 and a second collecting pipe 2 of an evaporator 240 (heat exchanger 100).

The second refrigeration system comprises another compressor 210, another condenser 220 and another expansion valve, wherein the compressor 210, the condenser 220 and the expansion valve are connected in series in sequence, and the expansion valve and the compressor 210 are connected to the third header 3 and the fourth header 4 of the evaporator 240 (heat exchanger 100), respectively.

In other words, the first header 1 and the second header 2 are respectively connected to the pipeline of the first refrigeration system, and the third header 3 and the fourth header 4 are respectively connected to the pipeline of the second refrigeration system.

In the dual refrigeration system air conditioner, depending on the load requirement, one of the refrigeration systems may be selected to operate independently (part load operation) or both refrigeration systems (full load operation) may be selected to operate simultaneously.

In some embodiments, the multi-refrigerant system air conditioning unit 200 includes a refrigerant flowing in the first section 51 in a direction opposite to a flowing direction of the refrigerant in the middle section 52, and a refrigerant flowing in the second section 53 in a direction opposite to the flowing direction of the refrigerant in the middle section 52.

In other words, the refrigerant reversely turns in the first bending section 541 while flowing from the first section 51 to the intermediate section 52 or from the intermediate section 52 to the first section 51, and reversely turns in the second bending section 544 while flowing from the second section 53 to the intermediate section 52 or from the intermediate section 52 to the second section 53.

In some embodiments, the first heat exchange tube 501 and/or the second heat exchange tube 501 in the evaporator 240 includes a bent section 54, a first section 51, an intermediate section 52 and a second section 53, taking the example that the first heat exchange tube 501 includes a bent section 54, a first section 51, an intermediate section 52 and a second section 53, the outer end of the first section 51 of the first heat exchange tube 501 is connected to the first collecting pipe 1, and the outer end of the second section 53 of the first heat exchange tube 501 is connected to the second collecting pipe 2.

As shown in fig. 1, in the first heat exchange tube 501, the refrigerant enters the first section 51 from the outer end of the first section 51 and flows in the forward left direction until reaching the first bending section 541 and is inverted at the first bending section 541, so as to flow in the left-right direction, and until reaching the second bending section 542 and is inverted at the second bending section 542, so as to flow in the backward left direction. When the flow direction of the system refrigerant is reversed, the local pressure drop of the refrigerant flow is increased, and distribution of the refrigerant in the inflow collecting pipe is facilitated.

In some embodiments, the heat exchanger 100 is a heat exchanger as shown in fig. 6 to 8, the outer end of the first section 51 of the second heat exchange tube 502 is connected to the third collecting main 3, and the outer end of the second section 53 of the second heat exchange tube 502 is connected to the fourth collecting main 4.

In other words, the first heat exchange tube 501 and the second heat exchange tube 502 are both bent tubes, the first header 1 and the second header 2 are located on one side of the middle section 52 of the first heat exchange tube 501 along the width direction of the middle section 52 of the first heat exchange tube 501, and the third header 3 and the fourth header 4 are located on the other side of the middle section 52 of the first heat exchange tube 501 along the width direction of the middle section 52 of the first heat exchange tube 501. As shown in fig. 6 to 8, the outer end of the first section 51 and the outer end of the second section 52 of the first heat exchange tube 501 are both located on the rear side of the intermediate section 52, the outer end of the first section 51 and the outer end of the second section 52 of the second heat exchange tube 502 are both located on the front side of the intermediate section 52, i.e., the first header 1 and the second header 2 are located on the rear side of the intermediate section 51, and the third header 3 and the fourth header 4 are located on the front side of the intermediate section 51.

The flow directions of the refrigerants in the first heat exchange tube 501 and the second heat exchange tube 502 are the same. In other words, the first header 1 and the third header 3 serve as inlets of the first system, the third header 3 serves as an inlet of the second system, and the first header 1 and the third header 3 are located on the same side of the middle section 52 of the first heat exchange tube 501 in the length direction of the middle section 52 of the first heat exchange tube 501.

As shown in fig. 6 to 8, the first collecting pipe 1 and the third collecting pipe 3 are located on the left side of the middle section 51, and the refrigerant of the first system enters the first heat exchange pipe 501 through the first collecting pipe 1 and enters the second collecting pipe 2 through the first heat exchange pipe 501, that is, the refrigerant of the first system flows in from the first collecting pipe 1 and flows out from the second collecting pipe 2. The refrigerant of the second system enters the second heat exchange tube 502 through the third header 3, and enters the fourth header 4 through the second heat exchange tube 502, that is, the refrigerant of the second system flows in from the third header 3, and flows out from the fourth header 4.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the description of the present specification, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.