阅读说明：本技术 一种基于双吸气压力压缩机的多功能温湿分控空调系统 (Multifunctional temperature and humidity separately-controlled air conditioning system based on double-suction pressure compressor ) 是由 梁江 左建波 武振兴 于 2020-05-09 设计创作，主要内容包括：本发明公开了一种基于双吸气压力压缩机的多功能温湿分控空调系统,包括室内机以及室外机；室外机具有双吸气压力压缩机；室内机包括新风除湿机、直膨式风机盘管、毛细辐射管作为空气处理末端；本发明的空调系统通过新风除湿机、直膨式风机盘管和毛细辐射管作为系统的三种空气处理末端,舒适性好、可靠性高,新风除湿机调节室内湿度,同时利用毛细辐射管和直膨式风机盘管作为室内温度的显热处理末端。通过优先使用毛细辐射管的方式,保证室内舒适性,在室内温度超过设定标准时,利用直膨式风机盘管辅助降温,从而减少了毛细铺装面积,增加个性化调温手段,系统可靠性大大提高。(The invention discloses a multifunctional temperature and humidity separately controlled air conditioning system based on a double-suction pressure compressor, which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a compressor, a temperature sensor, a temperature; the outdoor unit is provided with a double-suction pressure compressor; the indoor unit comprises a fresh air dehumidifier, a direct expansion type fan coil and a capillary radiant tube which are used as air treatment terminals; the air conditioning system of the invention takes the fresh air dehumidifier, the direct expansion type fan coil and the capillary radiant tube as three air treatment ends of the system, has good comfort and high reliability, the fresh air dehumidifier adjusts the indoor humidity, and simultaneously, the capillary radiant tube and the direct expansion type fan coil are used as sensible heat treatment ends of the indoor temperature. The mode of preferentially using the capillary radiant tube ensures the indoor comfort, and when the indoor temperature exceeds the set standard, the direct-expansion type fan coil is used for assisting in cooling, so that the capillary paving area is reduced, the personalized temperature regulation means is added, and the system reliability is greatly improved.)

1. The utility model provides a multi-functional temperature and humidity divides accuse air conditioning system based on double suction pressure compressor which characterized in that, this system includes:

an indoor unit; and

an outdoor unit (1);

the outdoor unit (1) is provided with a double-suction pressure compressor (5), and the double-suction pressure compressor (5) is provided with two suction ports and an air outlet;

the indoor unit comprises a fresh air dehumidifier (2), at least one straight expansion type fan coil (3) and at least one capillary radiant tube (4);

the fresh air dehumidifier (2), the straight expansion type fan coil (3) and the capillary radiant tube (4) are communicated with a double-suction pressure compressor (5) of the outdoor unit (1) through pipelines to receive or convey a refrigerant;

the system communicates the indoor with the outdoor through the fresh air dehumidifier (2) to realize air supply;

the system is configured to:

when the refrigeration working condition is adopted, the fresh air dehumidifier (2) is used for removing moisture in fresh air, the capillary radiant tube (4) bears the sensible heat load at a certain indoor temperature under the refrigeration working condition, and the direct expansion type fan coil (3) bears the sensible heat load reduced to a certain temperature; and

when the heating working condition is met, the fresh air dehumidifier (2) heats fresh air, the capillary radiant tube (4) bears the sensible heat load at a certain indoor temperature under the heating working condition, and the direct expansion type fan coil (3) bears the sensible heat load which is raised to a certain temperature.

2. The multifunctional temperature and humidity separately controlled air conditioning system based on the dual suction pressure compressor as claimed in claim 1, wherein two suction ports of the dual suction pressure compressor (5) of the outdoor unit (1) are configured as a low pressure suction port and a high pressure suction port, and the refrigerant inputted through the low pressure suction port and the high pressure suction port is compressed by the cylinder in the dual suction pressure compressor (5) and outputted from the air outlet;

the outdoor unit (1) comprises a plurality of straight-expansion type fan coils (3) and a plurality of capillary radiant tubes (4);

the plurality of straight-expansion type fan coils (3) are connected in parallel;

the plurality of capillary radiant tubes (4) are mutually connected in parallel.

3. The multifunctional temperature and humidity separately controlled air conditioning system based on the double suction pressure compressor as claimed in claim 2, wherein the air outlets of the double suction pressure compressor (5) of the outdoor unit (1) are respectively communicated with a four-way reversing valve through two branches;

the two four-way reversing valves are respectively a first four-way reversing valve (6) and a second four-way reversing valve (7);

the first four-way reversing valve (6) is provided with a first port a, a second port b, a third port c and a fourth port d;

the second four-way reversing valve (7) is provided with a first port A, a second port B, a third port C and a fourth port D;

the air outlet of the double-suction pressure compressor (5) is communicated with a first port a of the first four-way reversing valve (6) and a first port A of the second four-way reversing valve through branches respectively so as to convey refrigerant;

a fourth port D of the first four-way reversing valve (6) and a fourth port D of the second four-way reversing valve (7) are respectively communicated with a suction port;

a first electromagnetic valve (16) and a second electromagnetic valve (19) are respectively arranged on a passage between the first four-way reversing valve (6) and the air suction port and a passage between the second four-way reversing valve (7) and the air suction port, and the two passages are connected through a bridging electromagnetic valve (20);

the outdoor unit (1) further comprises an outdoor heat exchanger (8);

the refrigerant output from the second port B of the first four-way reversing valve (6) and the second port B of the second four-way reversing valve (7) is collected into a first pipeline (10);

the first pipeline (10) is provided with two first pipeline branches, wherein one first pipeline branch is communicated with a first connector (11) of the outdoor unit (1), and the other first pipeline branch is communicated with the outdoor heat exchanger (8);

in addition, the outdoor unit (1) further comprises a refrigerant-water heat exchanger (9) which is communicated with both the outdoor heat exchanger (8) and the double-suction pressure compressor (5).

4. The multifunctional temperature and humidity control air conditioning system based on the double suction pressure compressor as claimed in claim 3, wherein the outdoor heat exchanger (8) is connected to the second port (13) of the outdoor unit (1) through a third expansion valve (12) at the end opposite to the first pipeline branch;

the third port c of the first four-way reversing valve (6) is communicated with a fourth port (15) of the outdoor unit (1) through a second pipeline (14);

a third port C of the second four-way reversing valve (7) is communicated with a third interface (18) of the outdoor unit (1) through a third pipeline (17);

the refrigerant channel of the refrigerant-water heat exchanger (9) is connected in series between the second interface (13) and the third interface (18) of the outdoor unit through a fourth pipeline (21);

the heat exchange water channel of the refrigerant-water heat exchanger (9) is communicated with the capillary radiant tube (4);

and a fourth expansion valve (22) is installed on the fourth pipeline (21).

5. The multifunctional temperature and humidity control air conditioning system based on the double-suction pressure compressor is characterized in that the fresh air dehumidifier (2) comprises a blast pipeline (25) for communicating the indoor and the outdoor; and

the air filter (26), the fresh air heat exchanger (27), the reheating heat exchanger (28), the wet film humidifier (29) and the air supply fan (30) are integrated in the air supply pipeline (25) and are sequentially arranged from the outdoor end to the indoor end;

one end of the fresh air heat exchanger (27) is communicated with a second interface (13) of the outdoor unit (1) through a second expansion valve (31), and the other end of the fresh air heat exchanger (27) is communicated with a fourth interface (15) of the outdoor unit (1);

one end of the reheating heat exchanger (28) is communicated with a first interface (11) of the outdoor unit (1), and the other end of the reheating heat exchanger (28) is communicated with the fresh air heat exchanger (27) through a first expansion valve (32) and a one-way valve (33);

and the check valve (33) is configured to restrict the refrigerant from circulating from the fresh air heat exchanger (27) to the reheat heat exchanger (28).

6. The multifunctional temperature and humidity control air conditioning system based on the double-suction pressure compressor is characterized in that the direct-expansion type fan coil (3) comprises a shell (34), and a coil heat exchanger (35) and a fan (36) which are arranged in the shell (34);

one end of the coil heat exchanger (35) is communicated with a second interface (13) of the outdoor unit (1) through a fifth expansion valve (37), and the other end of the coil heat exchanger (35) is communicated with a third interface (18) of the outdoor unit (1);

one side of the shell (34) is configured to be an air inlet to suck indoor return air and send the air to the indoor through an air outlet on the other side after heat exchange.

7. The multifunctional temperature and humidity control air conditioning system based on the double-suction-pressure compressor as claimed in claim 6, wherein the fresh air heat exchanger (27), the outdoor heat exchanger (8), the reheating heat exchanger (28) and the coil heat exchanger (35) are all air-refrigerant heat exchangers.

8. The multifunctional temperature and humidity control air conditioning system based on the double-suction-pressure compressor as claimed in claim 7, wherein the fresh air heat exchanger (27), the outdoor heat exchanger (8), the reheat heat exchanger (28) and the coil heat exchanger (35) are finned tube heat exchangers and/or micro-channel heat exchangers.

9. The multifunctional temperature and humidity separately controlled air conditioning system based on the double-suction pressure compressor is characterized in that the refrigerant-water heat exchanger (9) is a plate heat exchanger or a double-pipe heat exchanger.

10. The multifunctional temperature and humidity control air conditioning system based on the double suction pressure compressor as claimed in claim 3, wherein an outdoor fan (24) is installed at the outdoor heat exchanger (8) of the outdoor unit (1).

Technical Field

The invention relates to the technical field of central air conditioners, in particular to a multifunctional temperature and humidity separately controlled air conditioning system based on a double-suction pressure compressor.

Background

Along with the development of science and technology, air conditioning system of humiture independent control compares in traditional air conditioning system and has bigger advantage, receives more and more people's attention.

Disclosure of Invention

The invention aims to provide a multifunctional temperature and humidity separately controlled air conditioning system based on a double-suction pressure compressor, which improves the energy efficiency of the system by combining an outdoor unit with various indoor air treatment tail ends.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention relates to a multifunctional temperature and humidity separately controlled air conditioning system based on a double-suction pressure compressor, which comprises:

an indoor unit; and

an outdoor unit;

the outdoor unit is provided with a double-suction pressure compressor, and the double-suction pressure compressor is provided with two suction ports and an air outlet;

the indoor unit comprises a fresh air dehumidifier, at least one straight expansion type fan coil and at least one capillary radiant tube;

the fresh air dehumidifier, the direct expansion type fan coil and the capillary radiant tube are communicated with a double-suction pressure compressor of the outdoor unit through pipelines to receive or convey a refrigerant;

the system communicates the indoor with the outdoor through the fresh air dehumidifier to realize air supply;

the system is configured to:

when the refrigeration working condition is met, the fresh air dehumidifier is used for removing water in fresh air, the capillary radiant tube bears the sensible heat load at a certain indoor temperature under the refrigeration working condition, and the direct expansion type fan coil bears the sensible heat load reduced to a certain temperature; and

when the heating working condition is met, the fresh air dehumidifier heats fresh air, the capillary radiant tube bears the sensible heat load at a certain indoor temperature under the heating working condition, and the direct expansion type fan coil bears the sensible heat load which is increased to a certain temperature.

Furthermore, two suction ports of a double suction pressure compressor of the outdoor unit are configured as a low pressure suction port and a high pressure suction port, and the refrigerant input through the low pressure suction port and the high pressure suction port is compressed by an inner cylinder of the double suction pressure compressor and then output from the air outlet;

the outdoor unit comprises a plurality of straight expansion type fan coils and a plurality of capillary radiant tubes;

the plurality of straight-expansion type fan coils are connected in parallel;

the plurality of capillary radiant tubes are connected in parallel with each other.

Further, the air outlets of the double-suction pressure compressors of the outdoor unit are respectively communicated with a four-way reversing valve through two branch circuits;

the two four-way reversing valves are respectively a first four-way reversing valve and a second four-way reversing valve;

the first four-way reversing valve is provided with a first port a, a second port b, a third port c and a fourth port d;

the second four-way reversing valve is provided with a first port A, a second port B, a third port C and a fourth port D;

the air outlet of the double-suction pressure compressor is communicated with the first port a of the first four-way reversing valve and the first port A of the second four-way reversing valve through branch lines respectively so as to convey refrigerant;

the fourth port D of the first four-way reversing valve and the fourth port D of the second four-way reversing valve are respectively communicated with an air suction port;

a first electromagnetic valve and a second electromagnetic valve are respectively arranged on a passage between the first four-way reversing valve and the air suction port and a passage between the second four-way reversing valve and the air suction port, and the two passages are connected through a bridging electromagnetic valve;

the outdoor unit also comprises an outdoor heat exchanger;

the refrigerant output by the second port B of the first four-way reversing valve and the second port B of the second four-way reversing valve is collected to a first pipeline;

the first pipeline is provided with two first pipeline branches, one first pipeline branch is communicated with a first interface of the outdoor unit, and the other first pipeline branch is communicated with the outdoor heat exchanger;

in addition, the outdoor unit further comprises a refrigerant-water heat exchanger communicated with both the outdoor heat exchanger and the double suction pressure compressor.

Furthermore, one end of the outdoor heat exchanger, which is opposite to the first pipeline branch, is communicated with a second interface of the outdoor unit through a third expansion valve;

a third port c of the first four-way reversing valve is communicated with a fourth interface of the outdoor unit through a second pipeline;

a third port C of the second four-way reversing valve is communicated with a third interface of the outdoor unit through a third pipeline;

a refrigerant channel of the refrigerant-water heat exchanger is connected in series between the second interface and the third interface of the outdoor unit through a fourth pipeline;

the heat exchange water channel of the refrigerant-water heat exchanger is communicated with the capillary radiant tube;

and a fourth expansion valve is installed on the fourth pipeline.

Furthermore, the fresh air dehumidifier comprises an air supply pipeline which is communicated with the indoor and the outdoor; and

the air filter, the fresh air heat exchanger, the reheating heat exchanger, the wet film humidifier and the air supply fan are integrated in the air supply pipeline and sequentially arranged from the outdoor end to the indoor end;

one end of the fresh air heat exchanger is communicated with a second interface of the outdoor unit through a second expansion valve, and the other end of the fresh air heat exchanger is communicated with a fourth interface of the outdoor unit;

one end of the reheating heat exchanger is communicated with a first interface of the outdoor unit, and the other end of the reheating heat exchanger is communicated with the fresh air heat exchanger through a first expansion valve and a one-way valve;

and the check valve is configured to limit the refrigerant from circulating from the fresh air heat exchanger to the reheat heat exchanger.

Further, the direct-expansion fan coil comprises a shell, and a coil heat exchanger and a fan which are arranged in the shell;

one end of the coil heat exchanger is communicated with a second interface of the outdoor unit through a fifth expansion valve, and the other end of the coil heat exchanger is communicated with a third interface of the outdoor unit;

one side of the shell is configured into an air inlet to suck indoor return air and supply the air to the indoor through an air outlet on the other side after heat exchange.

Furthermore, the fresh air heat exchanger, the outdoor heat exchanger, the reheating heat exchanger and the coil heat exchanger are all air-refrigerant heat exchangers.

Furthermore, the fresh air heat exchanger, the outdoor heat exchanger, the reheating heat exchanger and the coil heat exchanger adopt finned tube heat exchangers and/or micro-channel heat exchangers.

Further, the refrigerant-water heat exchanger is a plate heat exchanger or a sleeve heat exchanger.

Further, an outdoor fan is installed at an outdoor heat exchanger of the outdoor unit.

In the technical scheme, the multifunctional temperature and humidity separately controlled air conditioning system based on the double-suction pressure compressor provided by the invention has the following beneficial effects:

1. the air conditioning system of the invention takes the fresh air dehumidifier, the direct expansion type fan coil and the capillary radiant tube as three air treatment ends of the system, has good comfort and high reliability, the fresh air dehumidifier adjusts the indoor humidity, and simultaneously, the capillary radiant tube and the direct expansion type fan coil are used as sensible heat treatment ends of the indoor temperature. The indoor comfort is ensured by preferentially using the capillary radiant tube, and when the indoor temperature exceeds a set standard, the direct expansion type fan coil is used for assisting in cooling, so that the capillary paving area is reduced, the personalized temperature regulation means is added, and the system reliability is greatly improved; meanwhile, because the direct expansion type fan coil is not used for cooling indoors independently, the air handling capacity is greatly reduced, the indoor temperature requirement can be met by only depending on the capillary radiant tube in most of time, and the noise problem caused by the direct expansion type fan coil is thoroughly solved;

2. the air conditioning system has the advantages of small overall space occupation and attractive installation, the capillary radiant tube system at the indoor air treatment end can be directly hidden in a ceiling and a wall body, the indoor space is not occupied, the decoration effect is not influenced, and meanwhile, the direct expansion type fan coil used by the system is obviously smaller than the common fan coil due to the fact that the direct expansion type fan coil only needs to bear a small amount of room load, and the advantages of installation flexibility and attractive appearance degree are obvious.

3. The whole system only needs to be provided with one outdoor unit, does not obviously affect the outer vertical surface of the building, and is convenient to install.

4. The air conditioning system has high energy efficiency, and because two air treatment terminals are used indoors, the heat transfer area in the air treatment process is greatly increased, the heat transfer temperature difference is reduced, and the loss in the heat transfer process is effectively reduced; in addition, the double-suction pressure compressor is used as a core mechanism of the outdoor unit, and the suction pressure of the refrigerant bearing indoor sensible heat load is increased, so that the average compression ratio of the system is greatly reduced, and the power consumption of the compressor is obviously reduced compared with that of the traditional single-suction pressure compressor.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic connection diagram of a multifunctional temperature and humidity separately controlled air conditioning system based on a dual suction pressure compressor according to an embodiment of the present invention;

fig. 2 is a system schematic diagram of a multifunctional temperature and humidity separately controlled air conditioning system based on a double suction pressure compressor according to an embodiment of the present invention;

FIG. 3 is a system diagram illustrating the refrigeration operation of a multifunctional temperature and humidity controlled air conditioning system based on a dual suction pressure compressor according to an embodiment of the present invention;

fig. 4 is a system schematic diagram of a heating condition of a multifunctional temperature and humidity separately controlled air conditioning system based on a double suction pressure compressor according to an embodiment of the present invention.

Description of reference numerals:

1. an outdoor unit; 2, a fresh air dehumidifier; 3. a direct expansion type fan coil; 4. a capillary radiant tube;

5. a double suction pressure compressor; 6. a first four-way reversing valve; 7. a second four-way reversing valve; 8. an outdoor heat exchanger; 9. a refrigerant-water heat exchanger; 10. a first pipeline; 11. a first interface; 12. a third expansion valve; 13. a second interface; 14. a second pipeline; 15. a fourth interface; 16. a first solenoid valve; 17. a third pipeline; 18. a third interface; 19. a second solenoid valve; 20. bridging the electromagnetic valves; 21. a fourth pipeline; 22. a fourth expansion valve; 23. a water pump; 24. an outdoor fan; 25. an air supply duct; 26. an air filter; 27. a fresh air heat exchanger; 28. a reheat heat exchanger; 29. a wet film humidifier; 30. an air supply fan; 31. a second expansion valve; 32. a first expansion valve; 33. a one-way valve; 34. a housing; 35. a coil heat exchanger; 36. a fan; 37. and a fifth expansion valve.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

See fig. 1-4;

the invention relates to a multifunctional temperature and humidity separately controlled air conditioning system based on a double-suction pressure compressor, which comprises:

an indoor unit; and

an outdoor unit 1;

the outdoor unit 1 has a double suction pressure compressor 5, and the double suction pressure compressor 5 has two suction ports and one air outlet;

the indoor unit comprises a fresh air dehumidifier 2, at least one straight expansion type fan coil 3 and at least one capillary radiant tube 4;

the fresh air dehumidifier 2, the straight expansion type fan coil 3 and the capillary radiant tube 4 are communicated with a double-suction pressure compressor 5 of the outdoor unit 1 through pipelines to receive or convey a refrigerant;

the system communicates the indoor with the outdoor through a fresh air dehumidifier 2 to realize air supply;

the system is configured to:

in the refrigeration working condition, the fresh air dehumidifier 2 is used for removing moisture in fresh air, the capillary radiant tube 4 bears sensible heat load at a certain indoor temperature (for example, 28 ℃) in the refrigeration working condition, and the direct expansion type fan coil 3 bears sensible heat load reduced to a certain temperature (for example, 24 ℃); and

in the heating working condition, the fresh air dehumidifier 2 heats fresh air, the capillary radiant tube 4 bears sensible heat load at a certain indoor temperature (for example, 18 ℃) in the heating working condition, and the direct expansion type fan coil 3 bears sensible heat load raised to a certain temperature (for example, 24 ℃).

Specifically, the embodiment discloses an air conditioning system with a double-suction-pressure compressor 5, which is divided into an outdoor unit 1 and an indoor unit, wherein the outdoor unit 1 uses the double-suction-pressure compressor 5 as a core component, the indoor unit uses a fresh air dehumidifier 2, a direct-expansion type fan coil 3 and a capillary radiant tube 4 as an air treatment terminal, and the direct-expansion type fan coil 3 is used for assisting the capillary radiant tube 4 to bear indoor sensible heat load according to different working conditions (refrigeration/heating).

Preferably, in the present embodiment, two suction ports of the dual suction pressure compressor 5 of the outdoor unit 1 are configured as a low pressure suction port and a high pressure suction port, and the refrigerant input through the low pressure suction port and the high pressure suction port is compressed by the cylinder in the dual suction pressure compressor 5 and then output from the air outlet;

the outdoor unit 1 comprises a plurality of straight expansion type fan coil pipes 3 and a plurality of capillary radiant tubes 4;

the plurality of straight-expansion type fan coils 3 are connected in parallel;

the plurality of capillary radiant tubes 4 are connected in parallel with each other.

The double suction pressure compressor 5 of the present embodiment has two suction ports, and one of the two suction ports is configured as a low-pressure suction port and the other is configured as a high-pressure suction port; meanwhile, the number of the straight-expansion type fan coil 3 and the number of the capillary radiant tubes 4 in the embodiment can be properly adjusted according to the actual cooling/heating process requirement. In addition, the two suction ports of the double suction pressure compressor 5 of the present embodiment are independent of each other, and the refrigerant is outputted at the same outlet port by compression of the inner cylinder.

As a preferred technical scheme:

as shown in fig. 2;

the air outlets of the double-suction pressure compressor 5 of the outdoor unit 1 are respectively communicated with a four-way reversing valve through two branch circuits;

the two four-way reversing valves are respectively a first four-way reversing valve 6 and a second four-way reversing valve 7;

the first four-way selector valve 6 has a first port a, a second port b, a third port c and a fourth port d;

the second four-way reversing valve 7 has a first port a, a second port B, a third port C and a fourth port D;

the air outlet of the double-suction pressure compressor 5 is respectively communicated with a first port a of the first four-way reversing valve 6 and a first port A of the second four-way reversing valve 7 through branches to convey refrigerant;

the fourth port D of the first four-way reversing valve 6 and the fourth port D of the second four-way reversing valve are respectively communicated with an air suction port;

a first electromagnetic valve 16 and a second electromagnetic valve 19 are respectively arranged on a passage between the first four-way reversing valve 6 and the air suction port and a passage between the second four-way reversing valve 7 and the air suction port, and the two passages are connected through a bridging electromagnetic valve 20;

the outdoor unit 1 further includes an outdoor heat exchanger 8;

the refrigerant output from the second port B of the first four-way reversing valve 6 and the second port B of the second four-way reversing valve 7 is collected into the first pipeline 10;

the first pipeline 10 has two first pipeline branches, wherein one first pipeline branch is communicated with the first port 11 of the outdoor unit 1, and the other first pipeline branch is communicated with the outdoor heat exchanger 8;

the outdoor unit 1 further includes a refrigerant-water heat exchanger 9 communicating with both the outdoor heat exchanger 8 and the double suction pressure compressor 5.

One end of the outdoor heat exchanger 8 opposite to the first pipeline branch is communicated with a second interface 13 of the outdoor unit 1 through a third expansion valve 12;

the third port c of the first four-way reversing valve 6 is communicated with the fourth port of the outdoor unit 1 through a second pipeline 14;

a third port C of the second four-way reversing valve 7 is communicated with a third interface 18 of the outdoor unit 1 through a third pipeline 17;

the refrigerant channel of the refrigerant-water heat exchanger 9 is connected in series between the second port 13 and the third port 18 of the outdoor unit 1 through a fourth pipeline 21;

the heat exchange water channel of the refrigerant-water heat exchanger 9 is communicated with the capillary radiant tube 4;

a fourth expansion valve 22 is installed on the fourth pipe 21.

In the present embodiment, an outdoor fan 24 is mounted to the outdoor heat exchanger 8 of the outdoor unit 1.

As a preferred technical scheme:

as shown in fig. 2;

the fresh air dehumidifier 2 comprises an air supply pipeline 25 communicating the indoor and the outdoor; and

an air filter 26, a fresh air heat exchanger 27, a reheating heat exchanger 28, a wet film humidifier 29 and an air supply fan 30 which are integrated in the air supply pipeline 25 and are sequentially arranged from the outdoor end to the indoor end;

one end of the fresh air heat exchanger 27 is communicated with the second interface 13 of the outdoor unit 1 through a second expansion valve 31, and the other end of the fresh air heat exchanger 27 is communicated with the fourth interface 15 of the outdoor unit 1;

one end of the reheating heat exchanger 28 is communicated with the first interface 11 of the outdoor unit 1, and the other end of the reheating heat exchanger 28 is communicated with the fresh air heat exchanger 27 through a first expansion valve 32 and a one-way valve 33;

and the check valve 33 is configured to restrict refrigerant flow from the fresh air heat exchanger 27 to the reheat heat exchanger 28.

As a preferred technical scheme:

as shown in fig. 2;

the direct-expansion fan coil 3 includes a casing 34, and a coil heat exchanger 35 and a fan 36 installed in the casing 34;

one end of the coil heat exchanger 35 is communicated with the second port 13 of the outdoor unit 1 through a fifth expansion valve 37, and the other end of the coil heat exchanger 35 is communicated with the third port 18 of the outdoor unit 1;

the housing 34 is configured as an air inlet on one side to draw in return air from the room and to supply air to the room through an air outlet on the other side after heat exchange.

In the embodiment, the capillary radiant tubes 4 are connected in parallel at two ends of a heat exchange water channel of the refrigerant-water heat exchanger 9, circulating water is injected into the capillary radiant tubes 4, the circulating water is water at the current environmental temperature, and the circulating water is cooled into cold water by cooling the cold water fed into the capillary radiant tubes to carry out indoor refrigeration in summer; and the room heating is carried out after the normal temperature water fed in winter is heated.

In the embodiment, the two suction ports of the dual suction pressure compressor 5 of the outdoor unit 1 are respectively provided with an electromagnetic valve, namely, the first electromagnetic valve 16 and the second electromagnetic valve 19, and two forms of temperature and humidity processing can be switched:

when the first electromagnetic valve 16 is closed and the second electromagnetic valve 19 is opened, the fresh air dehumidifier 2 does not work any more, only the capillary radiant tube 4 and the direct expansion type fan coil 3 work, and at the moment, the adjustment can be carried out through the bridging electromagnetic valve 20;

when the second electromagnetic valve 19 is closed and the first electromagnetic valve 16 is opened, the fresh air dehumidifier 2 works, the capillary radiant tube 4 and the direct expansion type fan coil 3 do not work any more, and the refrigerating capacity of fresh air treatment can be adjusted by the bridging electromagnetic valve 20;

when the first solenoid valve 16 and the second solenoid valve 19 are simultaneously opened, the bridging solenoid valve 20 needs to be kept in a closed state.

The following is a further description of specific cooling/heating conditions:

referring to fig. 3, when the air conditioning system disclosed in this embodiment is in a cooling condition:

in summer, the temperature of the fed fresh air is reduced and cold water is provided through the air conditioning system of the embodiment, under the working condition, the first port a and the fourth port D of the first four-way reversing valve 6 and the first port A and the fourth port D of the second four-way reversing valve 7 are communicated, the third ports (c and D) and the second ports (B and B) are communicated, the outdoor heat exchanger 8 serves as a condenser, and the refrigerant-water heat exchanger 9 and the fresh air heat exchanger 27 both serve as evaporators.

The method specifically comprises the following steps:

refrigerant discharged by the double-suction pressure compressor 5 is respectively conveyed to a first port a of a first four-way reversing valve 6 and a first port A of a second four-way reversing valve 7 through branches, is discharged from corresponding second ports (B and B), and is divided into two branches through a first pipeline 10, wherein one branch of refrigerant is conveyed to an outdoor heat exchanger 8 for cooling and condensation, the other branch of refrigerant is directly conveyed to a reheating heat exchanger 28 for heating cooled and dehumidified fresh air to reach a comfortable temperature value, then the refrigerant enters the fresh air heat exchanger 27 through a first expansion valve 32 and a one-way valve 33 in sequence, the refrigerant discharged by the outdoor heat exchanger 8 is divided into three branches again, the first branch of refrigerant is mixed with the refrigerant of the reheating heat exchanger 28 and is conveyed into the fresh air heat exchanger 27 for dehumidifying and cooling the fresh air, the warmed refrigerant is conveyed to a third port c of the first four-way reversing valve 6 through a second pipeline 14 and is conveyed to a fourth port d of the first four-way reversing valve 6 through a first electromagnetic valve 16 The low-pressure air is sent into the low-pressure air inlet of the double-suction pressure compressor 5 again; the second refrigerant is throttled and cooled by a third expansion valve 12, enters a refrigerating-water heat exchanger 9 to supply water for cooling, is conveyed to a third port C of a second four-way reversing valve 7 through a third pipeline 17, is sent to a high-pressure air suction port of a double-suction pressure compressor 5 again through a fourth port D and a second electromagnetic valve 19, and flows into a capillary radiant tube 4 to cool the indoor temperature after the temperature of the refrigerant-water heat exchanger 9 is reduced; and the refrigerant discharged from the heat exchanger is conveyed to the third port C of the second four-way reversing valve 7 through the third pipeline 17 and is sent to the high-pressure air suction port of the double-suction pressure compressor 5 through the fourth port D and the second electromagnetic valve 19 again.

Referring to fig. 4, when the air conditioning system disclosed in this embodiment is in the heating condition:

in winter, the temperature of the fed fresh air is raised and hot water is simultaneously provided through the air conditioning system, under the working condition, the first port a and the fourth port D of the first four-way reversing valve 6 are communicated with the first port A and the fourth port D of the second four-way reversing valve 7, the third ports (C and C) are communicated with the second ports (B and B), the outdoor heat exchanger 8 serves as an evaporator, and the refrigerant-water heat exchanger 9 and the fresh air heat exchanger 27 serve as condensers.

The method specifically comprises the following steps:

the refrigerant discharged by the double-suction pressure compressor 5 is divided into two paths, one path of the refrigerant enters the fresh air heat exchanger 27 through the first four-way reversing valve 6 and the second pipeline 14 to heat fresh air, the other path of the refrigerant enters the refrigerant-water heat exchanger 9 through the second four-way reversing valve 7 to heat water, and the two paths of the refrigerant are converged in the fourth pipeline 21, throttled and cooled through the third expansion valve 12 and then enter the outdoor heat exchanger 8 to absorb heat from air; finally, the gasified and heated refrigerant is sent to a first four-way reversing valve 6 and a second four-way reversing valve 7 through a first pipeline 10 and respectively flows back to two air suction ports of the double-suction pressure compressor 5, and the heat pump cycle is completed.

Water heated by the refrigerant-water heat exchanger 9 heats the indoor space through the capillary radiant tube 4, and meanwhile, the refrigerant coming out of the second four-way reversing valve 7 is sent into the direct-expansion type fan coil 3 to be heated internally.

As a preferred technical scheme:

in this embodiment, the fresh air heat exchanger 27, the outdoor heat exchanger 8, the reheat heat exchanger 28, and the coil heat exchanger 35 are all air-refrigerant heat exchangers.

Among them, more specifically:

the fresh air heat exchanger 27, the outdoor heat exchanger 8, the reheating heat exchanger 28 and the coil heat exchanger 35 adopt finned tube heat exchangers and/or micro-channel heat exchangers.

In this embodiment, the refrigerant-water heat exchanger 9 is a plate heat exchanger or a double pipe heat exchanger.

In the technical scheme, the multifunctional temperature and humidity separately controlled air conditioning system based on the double-suction pressure compressor provided by the invention has the following beneficial effects:

the air conditioning system of the invention takes the fresh air dehumidifier 28, the direct expansion type fan coil 3 and the capillary radiant tube 4 as three air treatment ends of the system, has good comfort and high reliability, the fresh air dehumidifier 28 regulates the indoor humidity, and simultaneously, the capillary radiant tube 4 and the direct expansion type fan coil 3 are taken as sensible heat treatment ends of the indoor temperature. The indoor comfort is ensured by preferentially using the capillary radiant tube, and when the indoor temperature exceeds the set standard, the direct expansion type fan coil 3 is used for assisting in cooling, so that the capillary paving area is reduced, the personalized temperature regulation means is added, and the system reliability is greatly improved; meanwhile, because the direct-expansion fan coil 3 is not used for cooling the indoor space independently, the air handling capacity is greatly reduced, the indoor temperature requirement can be met by only depending on the capillary radiant tube 4 in most of time, and the noise problem caused by the use of the direct-expansion fan coil 3 is thoroughly solved;

the air conditioning system of the invention occupies little space as a whole, is installed beautifully, the capillary radiant tube 4 system at the indoor air treatment end can be directly hidden in a ceiling and a wall body, does not occupy indoor space and does not influence decoration effect, and meanwhile, because the direct expansion type fan coil 3 only needs to bear a small amount of room load, the volume of the direct expansion type fan coil used by the system is obviously smaller than that of a common fan coil, and the advantages of installation flexibility and beautifully appearance degree are obvious

The whole system only needs to be provided with one outdoor unit 1, does not obviously affect the outer vertical surface of a building, and is convenient to install.

The air conditioning system has high energy efficiency, and because two air treatment terminals are used indoors, the heat transfer area in the air treatment process is greatly increased, the heat transfer temperature difference is reduced, and the loss in the heat transfer process is effectively reduced; in addition, the double-suction pressure compressor 5 is used as a core mechanism of the outdoor unit 1, and the suction pressure of the refrigerant bearing the indoor sensible heat load is increased, so that the average compression ratio of the system is greatly reduced, and the power consumption of the compressor is obviously reduced compared with that of the traditional single-suction pressure compressor.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications to the described embodiments in a variety of different ways or with different temperature control criteria may be made without departing from the spirit and scope of the invention and are intended to be within the scope of the appended claims. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.