阅读说明：本技术 选择制冷系统用毛细管的装置及方法 (Apparatus and method for selecting capillary tube for refrigeration system ) 是由 董勇志 王军 于 2021-01-26 设计创作，主要内容包括：本发明公开了一种选择制冷系统用毛细管的装置及方法,所述装置包括：壳体,其内形成有腔体,其上形成有入端、出端和多路毛细管分支；选通件,其至少部分位于所述腔体内,用于选择一路或多路所述毛细管分支与所述入端及所述出端连通。所述方法包括：将所述装置中的入端与出端分别与制冷系统连接；令所有毛细管分支均与所述入端及所述出端连通,将包括所述装置在内的制冷系统抽真空并注入制冷剂；利用选通件选择所述毛细管分支与所述入端及所述出端连通,获取设置目标参数值；确定所述设置目标参数值满足设定要求时所对应的毛细管分支的规格定为选定毛细管规格。应用本发明,能解决现有技术存在的操作繁琐复杂、费时费力、效率低、成本高的问题。(The invention discloses a device and a method for selecting a capillary tube for a refrigeration system, wherein the device comprises: the shell is internally provided with a cavity, and an inlet end, an outlet end and a multi-path capillary branch are formed on the cavity; and the gating piece is at least partially positioned in the cavity and is used for selecting one path or multiple paths of the capillary branches to be communicated with the inlet end and the outlet end. The method comprises the following steps: connecting an input end and an output end of the device with a refrigeration system respectively; all the capillary tube branches are communicated with the inlet end and the outlet end, and a refrigeration system comprising the device is vacuumized and injected with a refrigerant; selecting the capillary branch to be communicated with the input end and the output end by using a gating piece to obtain a set target parameter value; and determining the specification of the corresponding capillary branch as the specification of the selected capillary when the set target parameter value meets the set requirement. The invention can solve the problems of complex operation, time and labor waste, low efficiency and high cost in the prior art.)

1. An apparatus for selecting a capillary tube for a refrigeration system, said apparatus comprising:

the device comprises a shell, a plurality of capillary tubes and a plurality of connecting pipes, wherein a cavity is formed in the shell, and an inlet end, an outlet end and a plurality of capillary tube branches are formed on the shell;

and the gating piece is at least partially positioned in the cavity and is used for selecting one path or multiple paths of the capillary branches to be communicated with the inlet end and the outlet end.

2. The apparatus for selecting a capillary tube for a refrigeration system of claim 1, wherein said gate comprises:

a plurality of through channels dispersedly disposed on the gate member along a moving direction of the gate member;

the gating piece moves in the cavity, and one path or multiple paths of capillary branches are selected to be communicated with the inlet end and the outlet end through the through channel according to different moving distances of the gating piece in the cavity.

3. The apparatus for selecting a capillary tube for a refrigerant system as set forth in claim 2, further comprising:

a housing positioning portion formed on an inner wall of the housing;

and the gating piece positioning part is formed on the gating piece and matched with the shell positioning part to realize the positioning of the gating piece in the cavity.

4. The apparatus of claim 3, wherein the housing-positioning portion is a groove, and the gate-positioning portion is a ball protruding from the gate main body.

5. The apparatus of claim 4, wherein the ball is a spring ball.

6. The apparatus of any one of claims 1 to 5, wherein a handle for pushing and pulling the gate is formed on the gate, and an operating portion of the handle is located outside the cavity.

7. The apparatus for selecting a capillary tube for a refrigeration system of claim 6, wherein an identifier is further formed on said handle presenting said communicated capillary tube branches.

8. A method for selecting a capillary tube for a refrigeration system using the apparatus for selecting a capillary tube for a refrigeration system according to any one of claims 1 to 7, the method comprising:

respectively connecting an input end and an output end of the device with a refrigerant pipeline of a refrigeration system;

controlling a gating piece in the device to enable all capillary branches in the device to be communicated with the inlet end and the outlet end, vacuumizing a refrigeration system comprising the device and injecting a refrigerant;

operating a refrigerating system, selecting different capillary branches to be communicated with the input end and the output end by using a gating piece, and acquiring set target parameter values when the different capillary branches are communicated with the input end and the output end;

and determining the specifications of all capillary branches communicated with the input end and the output end corresponding to the set target parameter values when the set target parameter values meet the set requirements as the specifications of the selected capillary.

9. The method of selecting a capillary tube for a refrigerant system as set forth in claim 8, further comprising:

after the refrigerating system including the device is injected with the refrigerant, the gating piece is controlled firstly, so that part of the capillary tube branches are communicated with the inlet end and the outlet end, and then the refrigerating system is operated.

10. The method of selecting a capillary tube for a refrigeration system according to claim 8 or 9, further comprising:

estimating the specifications of the required capillaries and comparing with the specifications of the capillaries in all capillary branches in the device;

if the specification of the required capillary tube is larger than the specification of the capillary tubes in all the capillary tube branches in the device, connecting an adjusting capillary tube at the input end of the device or the output end of the device, and connecting the adjusting capillary tube and the device with the refrigerant pipeline; the gauge of the tuning capillary is determined according to the gauge of the desired capillary and the gauge of the capillaries in all capillary branches in the device.

Technical Field

The invention belongs to the technical field of refrigeration systems, particularly relates to a capillary tube technology for a refrigeration system, and more particularly relates to a device and a method for selecting a capillary tube for a refrigeration system.

Background

The capillary tube is a common throttling part in the refrigeration system, the purpose of throttling is to reduce the pressure of refrigerant in the refrigeration system, reduce the flow rate of the refrigerant, form high-low pressure difference at two ends of the capillary tube, and absorb heat through the pressure reduction of the refrigerant, so that the purpose of absorbing air heat is achieved.

Capillary tubes of different specifications (length/inner diameter) affect the overall energy efficiency of the refrigeration system equipment by affecting the extended pressure drop. In order to ensure the energy efficiency of the whole machine, the capillary tube for the refrigerating system needs to be repeatedly debugged. In the prior art, in the development stage of a refrigeration system, firstly, an approximate capillary specification is determined by a calculation method; and then, adjusting the energy efficiency of the refrigeration equipment by finely adjusting the specification of the capillary tube in a laboratory until the required energy efficiency is achieved, and taking the specification of the capillary tube achieving the required energy efficiency as the capillary tube for the final refrigeration equipment. When the specification of the capillary tube is finely adjusted in a laboratory, stop valves are welded at two ends of the capillary tube, and the capillary tube is welded on the stop valves. When the capillary tube is replaced each time, the stop valve needs to be closed, the capillary tube is welded again, the refrigerant is filled again, and then the stop valve is opened for debugging.

The method for selecting the capillary tube has the advantages of complex operation, time and labor waste, low efficiency and high cost, increases the starting time of products, and wastes development resources.

Disclosure of Invention

The invention aims to provide a device and a method for selecting a capillary tube for a refrigeration system, which solve the problems of complex operation, time and labor waste, low efficiency and high cost in the prior art.

In order to achieve the purpose, the device for selecting the capillary tube for the refrigeration system provided by the invention adopts the following technical scheme:

an apparatus for selecting a capillary tube for a refrigeration system, comprising:

the device comprises a shell, a plurality of capillary tubes and a plurality of connecting pipes, wherein a cavity is formed in the shell, and an inlet end, an outlet end and a plurality of capillary tube branches are formed on the shell;

and the gating piece is at least partially positioned in the cavity and is used for selecting one path or multiple paths of the capillary branches to be communicated with the inlet end and the outlet end.

In one preferred embodiment, the gate includes:

a plurality of through channels dispersedly disposed on the gate member along a moving direction of the gate member;

the gating piece moves in the cavity, and one path or multiple paths of capillary branches are selected to be communicated with the inlet end and the outlet end through the through channel according to different moving distances of the gating piece in the cavity.

In one preferred embodiment, the apparatus further comprises:

a housing positioning portion formed on an inner wall of the housing;

and the gating piece positioning part is formed on the gating piece and matched with the shell positioning part to realize the positioning of the gating piece in the cavity.

In one preferred embodiment, the housing positioning portion is a groove, and the gating member positioning portion is a ball protruding from the gating member main body.

In one preferred embodiment, the ball is a spring ball.

In one preferred embodiment, a handle for pushing and pulling the gating piece is formed on the gating piece, and an operating part of the handle is positioned outside the cavity.

In one preferred embodiment, a marker is also formed on the handle presenting the communicated capillary branch.

In order to achieve the purpose, the method for selecting the capillary tube for the refrigeration system provided by the invention is realized by adopting the following technical scheme:

a method for selecting a capillary tube for a refrigeration system by using the device for selecting a capillary tube for a refrigeration system comprises the following steps:

respectively connecting an input end and an output end of the device with a refrigerant pipeline of a refrigeration system;

controlling a gating piece in the device to enable all capillary branches in the device to be communicated with the inlet end and the outlet end, vacuumizing a refrigeration system comprising the device and injecting a refrigerant;

operating a refrigerating system, selecting different capillary branches to be communicated with the input end and the output end by using a gating piece, and acquiring set target parameter values when the different capillary branches are communicated with the input end and the output end;

and determining the specifications of all capillary branches communicated with the input end and the output end corresponding to the set target parameter values when the set target parameter values meet the set requirements as the specifications of the selected capillary.

In one preferred embodiment, the method further comprises:

after the refrigerating system including the device is injected with the refrigerant, the gating piece is controlled firstly, so that part of the capillary tube branches are communicated with the inlet end and the outlet end, and then the refrigerating system is operated.

In one preferred embodiment, the method further comprises:

estimating the specifications of the required capillaries and comparing with the specifications of the capillaries in all capillary branches in the device;

if the specification of the required capillary tube is larger than the specification of the capillary tubes in all the capillary tube branches in the device, connecting an adjusting capillary tube at the input end of the device or the output end of the device, and connecting the adjusting capillary tube and the device with the refrigerant pipeline; the gauge of the tuning capillary is determined according to the gauge of the desired capillary and the gauge of the capillaries in all capillary branches in the device.

Compared with the prior art, the invention has the advantages and positive effects that:

the invention provides a device and a method for selecting a capillary tube for a refrigerating system.A feed end, a discharge end and a plurality of capillary tube branches are formed on a shell, a gating piece is formed in a cavity formed by the shell, and one or more capillary tube branches can be selected by the gating piece to be communicated with the feed end and the discharge end; when the inlet end and the outlet end of the shell are connected into the refrigerating system, the capillary branches which are communicated with the inlet end and the outlet end of the shell are actual capillaries connected into the refrigerating system, and the capillary branches which are not communicated with the inlet end and the outlet end are not connected into the refrigerating system; therefore, different paths of capillaries are selected to be communicated through the gating piece, so that different capillaries can be connected into the refrigeration system, and further, the different capillaries are utilized to carry out operation test, and the proper capillary specification which meets the parameter setting target of the refrigeration system is obtained; the device and the method provided by the invention have the advantages that when the connected capillary tubes with different specifications are changed in the refrigeration system, only the gating piece needs to be operated, the complex operation processes of operating the stop valve, welding the capillary tubes, filling the refrigerant and the like are not needed, the specification of the capillary tubes is selected and adjusted in an online mode, the operation is convenient and fast, the time and the labor are saved, the operation efficiency is high, and the operation cost for selecting the capillary tubes is reduced.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of one embodiment of an apparatus for selecting a capillary tube for a refrigeration system according to the present invention;

FIG. 2 is a schematic diagram of another embodiment of the apparatus for selecting a capillary tube for a refrigeration system of the present invention;

FIG. 3 is a schematic structural diagram of the embodiment of FIG. 2 in a first state;

FIG. 4 is a schematic structural diagram of the embodiment of FIG. 2 in a second state;

FIG. 5 is a flow chart of one embodiment of a method of selecting a capillary tube for a refrigeration system of the present invention.

In the above figures, the reference numerals and their corresponding part names are as follows:

10. a housing;

101. an input end; 102. outputting;

111. a first capillary branch; 1111. an input end; 1112. outputting; 112. a second capillary branch; 113. a third capillary branch; 114. a fourth capillary branch; 115. a fifth capillary branch;

12. a gating element; 121. a through passage;

20. a housing;

201. an input end; 202. outputting; 203. a housing positioning portion;

211. a first capillary branch; 212. a second capillary branch; 213. a third capillary branch; 214. a fourth capillary branch; 215. a fifth capillary branch;

22. a gating element;

221. a first through passage; 222. a second through passage; 223. a third through passage; 224. a third through passage; 225. a fifth through passage; 226. a sixth through passage; 227. a gating member positioning portion; 228. a handle; 2281. an operation unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, for example, as mechanical or electrical connections; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The invention aims to solve the problems of complex operation and low efficiency in the prior art of determining the specification of a capillary tube for a refrigeration system, and provides a device for selecting the capillary tube and a method for selecting the capillary tube by using the device.

Fig. 1 is a schematic diagram of an embodiment of the apparatus for selecting a capillary tube for a refrigeration system according to the present invention.

As shown in fig. 1, the device of this embodiment includes a housing 10, and a cavity is formed inside the housing 10. An inlet 101 and an outlet 102 are formed in the housing 10. The inlet 101 and outlet 102 are defined with respect to the flow direction of the refrigerant when the device is used in a refrigeration system. When the device is switched into a refrigeration system, the inlet 101 will be connected to the condenser outlet and the outlet 102 will be connected to the evaporator inlet. The inlet 101 and the outlet 102 may be openings formed on the housing and communicated with the internal cavity of the housing 10, or may be a pipe section communicated with the internal cavity of the housing 10.

Five capillary branches, namely a first capillary branch 111, a second capillary branch 112, a third capillary branch 113, a fourth capillary branch 114 and a fifth capillary branch 115, are also formed in the housing 10. The five capillary branches are communicated with the internal cavity of the housing 10 and are arranged in sequence on the housing 10. In other embodiments, the number of capillary branches is not limited to five, and other multiple paths may be used, as long as the number of multiple paths is not less than two, and all the multiple paths are within the scope of the present invention. In this embodiment, the capillaries in each capillary branch have equal inside diameters and are not all equal or not all equal in length.

The apparatus of this embodiment further comprises a gate 12 at least partially located within the cavity of the housing 10 for selecting one or more capillary branches to communicate with the inlet 101 and outlet 102. At least a part of the gating member 12 for gating one or more capillary tubes is located in the cavity of the housing 10, so that when part of the structure of the gating member 12 is sealed in the cavity to avoid refrigerant leakage, the one or more capillary tube branches can be selected to be communicated with the inlet end 101 and the outlet end 102 through the gating member 12.

As described above, when the apparatus is applied to a refrigeration system, the inlet port 101 and the outlet port 102 are connected to the refrigerant flow path. Then, the capillary tube branches communicating with the inlet end 101 and the outlet end 102 will also be cut into the refrigerant flow path, and the capillary tube branches not communicating with the inlet end 101 and the outlet end 102 will not be cut into the refrigerant flow path. Thus, selection of the actual capillary tube connected to the refrigerant flow path is achieved by the gating or non-gating of the capillary tube branch by the gating member 12.

Further, referring to fig. 1, in this embodiment, each capillary branch also includes an inlet end and an outlet end, and the inlet end and the outlet end are respectively communicated with the cavity of the housing 10. Taking the first capillary branch 111 as an example, in fig. 1, the position on the right side of the housing 10 opposite to the input end 101 of the housing 10 is an input end 1111 of the first capillary branch 111, and on the left side of the housing 10, the position above the input end 101 of the housing 10 is an output end 1112 of the first capillary branch 111. The input ends and the output ends of the other capillary branches are also arranged in sequence in a manner that the right side of the shell 10 is the input end, the left side of the shell is the output end, and the output end is positioned above the input end.

The gate 12 has a plurality of through-passages 121 arranged in the vertical direction. The inner diameter of each through-channel 121 is dimensioned to correspond to the inner diameter of the capillary branch. The capillary branches may communicate with the inlet end 101 and the outlet end 102 of the housing 10 through the through-channels 121.

Specifically, in the position of the gate 12 shown in fig. 1, the inlet end 101 of the housing communicates with the inlet end 1111 of the first capillary branch 111 through one through-channel, the outlet end 1112 of the first capillary branch 111 communicates with the inlet end of the second capillary branch 112 through another through-channel, the outlet end of the second capillary branch 112 communicates with the inlet end of the third capillary branch 113 through another through-channel, and the outlet end of the third capillary branch 113 communicates with the outlet end 102 of the housing 10 through the uppermost through-channel. The coupled capillary branches are thus selected as the first 111, second 112 and third 113 capillary branches, whereas the fourth 114 and fifth 115 capillary branches are not coupled. When the inner diameters of the capillary branches are equal, the actual capillary tube connected to the refrigeration system has an inner diameter equal to the inner diameter of each capillary branch and a length equal to the sum of the lengths of the first capillary branch 111, the second capillary branch 112, and the third capillary branch 113.

The position of the gate 12 in the cavity changes, and the position of the through channel changes accordingly, so that the capillary branches connected to the inlet end 101 and the outlet end 102 of the shell 10 through the through channel can be changed, that is, the length of the actual capillary in the refrigeration system is changed, and the access of capillaries with different specifications in the refrigeration system is realized.

In other embodiments, the inner diameters of the capillaries in the capillary branches may also be completely unequal or not completely equal. Then, the capillary branches with different inner diameters are selected to be connected with the inlet end and the outlet end of the shell through the through channel, so that the capillary branches with different inner diameters are connected into the pipeline. When the specification of the capillary branch which is actually connected is calculated, the specification can be unified according to the conversion relation between the inner diameter and the length, and the length and the inner diameter of the capillary which is actually connected can be determined.

By adopting the device for selecting the capillary tube for the refrigeration system, the inlet end, the outlet end and the multiple paths of capillary tube branches are formed on the shell, the gating piece is formed in the cavity formed by the shell, and one or more paths of capillary tube branches can be selected by the gating piece to be communicated with the inlet end and the outlet end. When the inlet end and the outlet end of the shell are connected into the refrigerating system, the capillary branches which are communicated with the inlet end and the outlet end of the shell are actual capillaries connected into the refrigerating system, and the capillary branches which are not communicated with the inlet end and the outlet end are not connected into the refrigerating system. Therefore, different capillary tubes can be connected into the refrigeration system by selecting the capillary tubes in different paths through the gating piece for communication, and then the operation test is carried out by utilizing the different capillary tubes, so that the proper capillary tube specification meeting the set parameter target of the refrigeration system is obtained. The device of the embodiment is used for realizing that when the connected capillary tubes with different specifications are changed in the refrigerating system, only the gating piece needs to be operated, the complex operation processes of operating the stop valve, welding the capillary tubes, filling the refrigerant and the like are not needed, the capillary tube specification selection and adjustment in an online mode are realized, the operation is convenient and fast, the time and the labor are saved, the operation efficiency is high, and the operation cost for selecting the capillary tubes is reduced.

Fig. 2 to 4 show another embodiment of the device for selecting a capillary tube for a refrigeration system according to the present invention, wherein fig. 2 is a schematic structural view of the embodiment, and fig. 3 and 4 are schematic structural views of the embodiment in two different states, respectively.

As shown in fig. 2 to 4, the device of this embodiment includes a housing 20, and a cavity is formed inside the housing 20. An inlet end 201 and an outlet end 202 are formed on the housing 20. The inlet end 201 and the outlet end 202 are defined with respect to the flow direction of the refrigerant when the device is used in a refrigeration system. When the device is switched into a refrigeration system, the inlet end 201 will be connected to the condenser outlet and the outlet end 202 will be connected to the evaporator inlet. The inlet end 201 and the outlet end 202 are both a section of pipe communicated with the inner cavity of the shell 20, so as to be connected with other pipes when being applied to a refrigeration system.

Five capillary branches, namely a first capillary branch 211, a second capillary branch 212, a third capillary branch 213, a fourth capillary branch 214 and a fifth capillary branch 215, are also formed in the housing 20. The five capillary branches are in communication with the interior cavity of the housing 20 and are arranged in sequence on the housing 20. The capillaries in the five capillary branches have equal inner diameters and unequal lengths. Each capillary branch also includes an inlet end and an outlet end, and the inlet end and the outlet end are respectively communicated with the cavity of the housing 20.

The apparatus of this embodiment further comprises a gate 22, and the gate 22 comprises a gate body and a handle 228, wherein the gate body is entirely located within the cavity of the housing 20 and sealed from both ends of the cavity to prevent leakage of the refrigerant. Manipulation of the handle 228 enables the gate 22 to be moved within the cavity in the direction of the axis of the handle 228.

Six through channels are formed in the gate body, and are arranged and dispersed in sequence from one end close to the handle 228 to one end far from the handle 228, and the arrangement direction is also the moving direction of the gate 22 in the cavity. The six through channels are respectively a first through channel 221, a second through channel 222, a third through channel 223, a fourth through channel 224, a fifth through channel 225 and a sixth through channel 226 from one end close to the handle 228 to one end far away from the handle 228. Further, the sixth through passage 226 is a through passage near the outlet end 202 of the housing 20, and its tip end is in communication with the outlet end 202. Also, the outlet 202 can follow the movement of the gate 22. Also, when gate 22 is moved to the outermost end as shown in fig. 4, outlet 202 still maintains a portion of the tube segment exposed from housing 20.

A casing positioning part 203 is formed on the inner wall of the casing 20, a gate positioning part 227 is formed on the gate 22, and the casing positioning part 203 and the gate positioning part 227 are matched to realize the positioning of the gate 22 in the cavity. With the five capillary branches, to achieve multi-position positioning of the gate 22, the housing positioning portion 203 and the gate positioning portion 227 each include at least 5 positioning members.

Specifically, in this embodiment, the housing positioning portion 203 includes at least 5 grooves, and the gate positioning portion 227 includes at least 5 sets of balls. The ball is embedded into the groove to realize positioning. In a preferred embodiment, the ball is a spring ball, and the spring ball and the groove cooperate to provide a jerk when the handle 228 is pushed, so that the moving distance of the gate 22 can be controlled, thereby improving the accuracy of selecting the connected capillary branches.

For ease of handling, the operating portion 2281 at the end of the handle 228 is located outside the cavity, and the operating portion 2281 has an oval spherical shape for ease of handling.

A marker (not shown) is also formed on the handle 228 at the rear end of the operating portion 2281 and is used to represent the capillary branch through which the gate 22 communicates. In one embodiment, the marks are scale lines and scale values corresponding to the connected capillary branches. By reading the scale value exposed outside the housing 20, it is possible to know which capillary tube or capillary tubes are currently connected.

The process of selecting the capillary tube for the refrigerating system by adopting the device is as follows:

fig. 3 is a schematic structural view showing a state in which all five capillary branches are communicated with the inlet end 101 and the outlet end 102 of the housing 20. In this state, the handle is pushed inward to the extreme position and positioned. The first through channel 221 communicates the inlet end 201 with the inlet end of the first capillary branch 211, and the second through channel 222 communicates the outlet end of the first capillary branch 211 with the inlet end of the second capillary branch 212; the third through channel 223 communicates the outlet end of the second capillary branch 212 with the inlet end of the third capillary branch 213; the fourth through channel 224 communicates the outlet end of the third capillary branch 213 with the inlet end of the fourth capillary branch 214; the fifth through channel 225 communicates the outlet end of the fourth capillary branch 214 with the inlet end of the fifth capillary branch 215; the sixth through passage 226 communicates the outlet end of the fifth capillary branch 215 with the outlet end 202 of the housing 20. In this state, when the device is applied to a refrigeration system, the inlet port 201 and the outlet port 202 are connected to the refrigerant flow path. Then, five capillary tube branches communicating with the inlet port 201 and the outlet port 202 are also connected to the refrigerant flow path.

Fig. 4 is a schematic structural view showing a state in which only the first capillary branch 211 communicates with the inlet end 101 and the outlet end 102 of the housing 20. In this state, the handle is moved inward by a short distance and positioned. The fifth through channel 225 communicates the inlet end 201 with the inlet end of the first capillary branch 211, the sixth through channel 226 communicates the outlet end of the first capillary branch 211 with the outlet end 202 of the housing 20, the remaining capillary branches not being communicated. In this state, when the device is applied to a refrigeration system, the inlet port 201 and the outlet port 202 are connected to the refrigerant flow path. Then, the first capillary branch 211 communicating with the inlet end 201 and the outlet end 202 is connected to the refrigerant flow path, and none of the remaining capillary branches is connected to the refrigerant flow path.

The push-and-pull of the handle 228 is controlled by the operating part 2281, so that the change of the moving distance of the gating piece main body forming the through channel in the cavity is changed, the position of the through channel is changed, and the capillary branches connected with the inlet end 201 and the outlet end 202 of the shell 20 through the through channel can be changed, that is, the specification of the actual capillary in the refrigeration system is changed, and the access of capillaries with different specifications in the refrigeration system is realized.

Fig. 5 is a flow chart illustrating an embodiment of a method for selecting a capillary tube for a refrigeration system according to the present invention, and more particularly, a flow chart illustrating a method for selecting a capillary tube using the apparatus for selecting a capillary tube for a refrigerant system illustrated in the embodiment of fig. 1 or fig. 2 or other preferred embodiments.

For convenience of description, this embodiment selects a capillary tube for a refrigeration system using the following method in conjunction with the apparatus shown in fig. 2 to 4.

Step 51: the inlet end and the outlet end of the device are respectively connected with a refrigerant pipeline of the refrigeration system.

The inlet end is connected with the outlet of the condenser, in particular to a pipeline connected with the outlet of the condenser; the outlet end is connected with the inlet of the evaporator, in particular to a pipeline connected with the inlet of the evaporator.

Step 52: and controlling a gating piece in the device to enable all capillary branches in the device to be communicated with the inlet end and the outlet end, vacuumizing a refrigeration system comprising the device and injecting the refrigerant.

In the state shown in fig. 3, all five capillary branches in the device are communicated with the inlet end and the outlet end, so that all the capillary branches in the device are connected to the refrigeration system.

Step 53: and operating the refrigerating system, selecting different capillary branches to be communicated with the input end and the output end by using the gating piece, and acquiring set target parameter values when the different capillary branches are communicated with the input end and the output end.

In a refrigeration system, the capillary tube of a desired specification is typically determined by setting a target parameter value to meet a requirement. The set target parameters include, but are not limited to, refrigerant outlet pipe throttling temperature, refrigerant outlet pipe throttling pressure.

When the refrigerating system operates, different capillary branches are selected by the gating piece in the device to be communicated with the inlet end and the outlet end, so that different capillary branches are connected into the refrigerant circulating pipeline. After capillary branches are selected and stably run each time, a set target parameter value in the current connected capillary branch state is obtained, and the obtained set target parameter value is compared with a set required value. If the set required value is not met, the position of the gating piece is changed, and particularly, the distance of the gating piece in the cavity can be moved through the handle to select different capillary branches to be connected into the circulating pipeline of the refrigerant system.

Step 54: and determining the specifications of all capillary branches communicated with the inlet end and the outlet end corresponding to the set target parameter values meeting the set requirements as the specifications of the selected capillary.

The target parameter value is set to meet the set requirement, and the capillary specification in the state meets the set requirement, so that the energy efficiency required by the system can be achieved. The specification of the capillary tube is selected according to the specified positioning of all the capillary tube branches which are communicated with the inlet end and the outlet end at the moment.

And after the specification of the selected capillary tube is determined, the device is removed from the refrigerating system, the capillary tube with the same specification is selected according to the specification of the selected capillary tube and is welded into the refrigerating system, and the selection of the capillary tube for the refrigerating system is completed.

By adopting the method, the device for selecting the capillary tube for the refrigerating system is combined, after the device is welded into the refrigerating system once, vacuumization and refrigerant injection are performed once, and the connected capillary tubes with different specifications are changed in the refrigerating system, only the gating piece needs to be operated, and the complex operation processes of operating the stop valve, welding the capillary tube, filling the refrigerant and the like are not needed; in addition, when the gating piece is operated, the refrigeration system does not need to be stopped, so that the capillary specification selection and adjustment in an online mode are realized, the operation is convenient, the time and the labor are saved, the operation efficiency is high, and the cost for selecting the capillary is greatly reduced.

In other embodiments, to increase the speed of the gating member selecting the connected capillary branch, after the refrigerant is injected into the refrigeration system including the apparatus, the gating member is controlled to connect a portion of the capillary branch to the inlet and outlet, and then the refrigeration system is operated. For example, the gate is controlled so that half of the capillary branches communicate. Then, after the refrigeration system is operated, the adjustment of reducing the capillary branches or increasing the capillary branches can be performed on the basis that half of the capillary branches are communicated, and the selection speed can be improved.

In other preferred embodiments, the specification of all capillary branches in the device may not meet the tuning requirements, and to ensure that the selection of the capillary is performed smoothly with the device, the selection of the capillary is performed by:

the specification of the desired capillary is first estimated and compared to the specifications of the capillaries in all the capillary branches in the device. The method of estimating the capillary specification is carried out using the prior art.

If the specification of the required capillary tube is larger than that of the capillary tubes in all the capillary tube branches in the device, a section of adjusting capillary tube is connected at the input end or the output end of the device, and the adjusting capillary tube and the device are connected with the refrigerant pipeline.

The specification of the adjusting capillary is determined according to the specification of the required capillary and the specification of the capillaries in all capillary branches in the device, so that the specification of the required capillary can be achieved after the specification of the capillary and the specifications of the capillaries in all capillary branches in the device are adjusted. As a more preferred embodiment, the specification of the capillary is adjusted to the estimated desired capillary specification minus half the specification of all capillary branches in the device.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.