CN214469435U - Multi-split air conditioner system with refrigerant recovery function - Google Patents

Abstract

The utility model discloses a multi-split air conditioner system with a refrigerant recovery function, which comprises an outdoor unit, at least one group of hydraulic modules and at least one group of indoor modules, wherein, the device also comprises a liquid pipe, a high-low pressure air pipe, a high pressure air pipe, a liquid pipe stop valve arranged on the liquid pipe, a high-low pressure stop valve arranged on the high-low pressure air pipe, a high pressure stop valve arranged on the high pressure air pipe and a low pressure detection device arranged at the input end of the compressor, wherein, a preset refrigerant recovery mode can be started after the high-pressure stop valve is closed as required, the liquid pipe stop valve is closed after the compressor reaches a preset working frequency in the refrigerant recovery period, and the high-pressure stop valve and the low-pressure stop valve are closed until the low-pressure value monitored by the low-pressure detection device is lower than a preset pressure value so as to finish the refrigerant recovery mode, the refrigerant can be effectively and completely recycled into the outdoor unit, the operation is simple, and the recycling efficiency is high.

Description

Multi-split air conditioner system with refrigerant recovery function

Technical Field

The utility model belongs to the technical field of the technique of the multi-split system and specifically relates to indicate a multi-split system with refrigerant recovery function.

Background

At present, in a multifunctional multi-split air conditioner system with a three-pipe outdoor unit matched with an air conditioner indoor unit and a hydraulic module, the outdoor unit is provided with three pipes, the hydraulic module is also provided with three pipes and two groups of electromagnetic valves, when the system needs to recycle pipelines outside the outdoor unit, the air conditioner indoor unit and refrigerants of the hydraulic module to the outdoor unit, because the system pipelines are complex, the pipeline refrigerants between high-pressure air pipes which are usually connected with the outdoor unit and the hydraulic module cannot be recycled and need to be released into the atmosphere, the system is not environment-friendly, the refrigerant quantity in use is greatly reduced, the refrigerant quantity is few and unclear, extra cost is needed for adding the refrigerants, the amount of the added refrigerants is unclear, the refrigerant can be added only by means of system state points, and finally the system is not operated at the optimal point.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a function abundant, energy-conserving efficient have the refrigerant and retrieve many online system of function.

In order to achieve the above object, the utility model provides a multi-split air conditioner system with refrigerant recovery function, including off-premises station, at least a set of hydraulic module and at least a set of indoor module, wherein, the off-premises station includes compressor, first cross valve, second cross valve and outdoor heat exchanger, the output of compressor respectively with first cross valve D interface and second cross valve D interface connection, the input of compressor respectively with the S interface of first cross valve and second cross valve S interface connection, the E interface of first cross valve is through the S interface connection of throttle unit with the second cross valve, the C interface of second cross valve is through the S interface connection of throttle unit with first cross valve, the C interface of first cross valve is connected with outdoor heat exchanger; the hydraulic module also comprises a liquid pipe, a high-low pressure air pipe and a high-pressure air pipe, wherein one end of the liquid pipe is connected with the outdoor heat exchanger, and the other end of the liquid pipe is respectively connected with the other end of the hydraulic heat exchanger of the hydraulic module and the other end of the indoor heat exchanger of the indoor module; one end of the high-pressure air pipe is connected between the four-way valve and the output end of the compressor in a bypass mode, and the other end of the high-pressure air pipe is connected with one end of the hydraulic heat exchanger of the hydraulic module; one end of the high-low pressure air pipe is connected with an E interface of the second four-way valve, and the other end of the high-low pressure air pipe is respectively connected with one end of a hydraulic heat exchanger of the hydraulic module and one end of an indoor heat exchanger of the indoor module; still including locating the liquid pipe stop valve on the liquid pipe, locate the high low pressure stop valve on the high low pressure trachea, locate the high pressure stop valve on the high pressure trachea and locate the low pressure detection device of compressor input end department, wherein, can launch predetermined refrigerant recovery mode after closing the high pressure stop valve as required, and the compressor closes the liquid pipe stop valve after reaching predetermined operating frequency during the refrigerant is retrieved, when the low pressure value that low pressure detection device monitored is less than predetermined pressure value, close high low pressure stop valve, in order to accomplish the refrigerant recovery mode.

Further, the oil separator is arranged at the output end of the compressor.

Furthermore, the device also comprises a gas-liquid separator arranged at the input end of the compressor.

Furthermore, a first electronic expansion valve is arranged between the liquid pipe and each hydraulic heat exchanger and each indoor heat exchanger.

Further, the system comprises at least two compressors which are arranged in parallel.

Furthermore, one end of the liquid pipe close to the outdoor heat exchanger is provided with an outdoor unit electronic expansion valve.

Furthermore, a first electromagnetic valve is arranged between the high-pressure air pipe and any one hydraulic heat exchanger.

Furthermore, a second electromagnetic valve is arranged between the high-low pressure air pipe and any one hydraulic heat exchanger.

Further, the throttling unit is a capillary tube.

Furthermore, the high-low pressure air pipe is connected with one end of the hydraulic heat exchanger and the indoor heat exchanger through a branch pipe, and the liquid pipe is respectively connected with the hydraulic heat exchanger and the indoor heat exchanger through the branch pipe.

The utility model adopts the above technical scheme, its beneficial effect lies in: the hydraulic module can produce hot water or cold water when the indoor module is refrigerated, or the hydraulic module can produce hot water or cold water when the air conditioning system is heated, the functions are rich and diverse, and the use cost is effectively reduced. Also has the characteristics of energy conservation, heat recovery, high efficiency and the like; in addition, the refrigerant recovery mode is provided, which can effectively and completely recover the refrigerant to the outdoor unit, and has simple operation and high recovery efficiency.

Drawings

Fig. 1 is a schematic diagram illustrating a connection configuration of a multi-split system.

The system comprises 100-outdoor unit, 200-hydraulic module, 300-indoor module, 1-compressor, 2-first four-way valve, 3-second four-way valve, 4-outdoor heat exchanger, 5-oil separator, 6-gas-liquid separator, 7-liquid pipe, 8-high-low pressure gas pipe, 9-high pressure gas pipe, 10-hydraulic heat exchanger, 11-indoor heat exchanger, 12-first electronic expansion valve, 13-first solenoid valve and 14-second solenoid valve.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1, in the present embodiment, a multi-split air conditioning system with a refrigerant recycling function includes an outdoor unit 100, at least one group ofhydraulic modules 200, and at least one group ofindoor modules 300, and for convenience of explanation of the present embodiment, two groups ofhydraulic modules 200 arranged in parallel and three groups ofindoor modules 300 arranged in parallel are defined herein.

In the present embodiment, the outdoor unit 100 includes a compressor 1, a first four-way valve 2, a second four-way valve 3, an outdoor heat exchanger 4, an oil separator 5, and a gas-liquid separator 6, wherein each of the first four-way valve 2 and the second four-way valve 3 includes C, D, E, S four ports. The output end of the compressor 1 is respectively connected with a D interface of the first four-way valve 2 and a D interface of the second four-way valve 3 through an oil separator 5, the input end of the compressor 1 is connected with an S interface of the first four-way valve 2 and an S interface of the second four-way valve 3 through a gas-liquid separator 6, a C interface of the first four-way valve 2 is connected with one end of an outdoor heat exchanger 4, and an E interface of the first four-way valve 2 is connected with a C interface of the second four-way valve connected with the S interface of the second four-way valve 3 through a throttling unit and is connected with the S interface of the first four-way valve 2 through a throttling unit.

Further, when the first four-way valve 2 is powered down, the interface D is communicated with the interface C, the interface E is communicated with the end S, and when the first four-way valve 2 is powered on, the interface D is communicated with the interface E.

Further, when the second four-way valve 3 is powered off, the D interface is conducted with the C interface, the E interface is conducted with the S interface, and due to the fact that the C interface is connected through the capillary tube, actually, the refrigerant throughput is little, namely, no refrigerant passes through from the D interface to the C end. When the second four-way valve 3 is powered on, the D interface is communicated with the E interface, and the C interface is communicated with the S interface.

Further, in order to ensure that the compressors 1 have sufficient output power in the multi-split air conditioner, at least two compressors 1 may be provided in parallel, so that the compressors 1 are started as required.

In the present embodiment, eachhydro module 200 includes ahydro heat exchanger 10. Eachindoor module 300 includes anindoor heat exchanger 11. The device also comprises a liquid pipe 7, a high-low pressure air pipe 8 and a high-pressure air pipe 9, wherein an E interface of the second four-way valve 3 is connected with one end of the high-low pressure air pipe 8, and the other end of the high-low pressure air pipe 8 is respectively connected with one end of ahydraulic heat exchanger 10 and one end of anindoor heat exchanger 11 through a branch pipe. One end of the liquid pipe 7 is connected with the outdoor heat exchanger 4, and the other end of the liquid pipe 7 is respectively connected with the other end of thehydraulic heat exchanger 10 and the other end of theindoor heat exchanger 11. One end of the high-pressure air pipe 9 is connected between the four-way valve and the output end of the compressor 1 in a bypass mode, and the other end of the high-pressure air pipe 9 is connected with one end of thehydraulic heat exchanger 10.

Furthermore, electronic expansion valves are arranged between the liquid pipe 7 and eachhydraulic heat exchanger 10 and eachindoor heat exchanger 11.

Furthermore, an outdoor electronic expansion valve is arranged at one end of the liquid pipe 7 close to the heat exchanger.

In this embodiment, a first electromagnetic valve 13 is disposed between the high-pressure air pipe 9 and any one of the hydro-heat exchangers 10, and a second electromagnetic valve 14 is disposed between the high-pressure air pipe 8 and any one of the hydro-heat exchangers 10, wherein the opening and closing of the first electromagnetic valve 13 and the second electromagnetic valve 14 are correspondingly switched according to the operation mode requirement of the multi-split air-conditioning system.

Further, the high-low pressure air pipe 8 is connected with one end of thehydraulic heat exchanger 10 and theindoor heat exchanger 11 through a branch pipe, and the liquid pipe 7 is respectively connected with thehydraulic heat exchanger 10 and theindoor heat exchanger 11 through the branch pipe.

Specifically, the multi-split air conditioner comprises the following operation modules:

1) only theindoor module 300 operates in the cooling mode: at this time, the first four-way valve 2 is powered off, the second four-way valve 3 is powered off, the firstelectronic expansion valves 12 of all thehydraulic modules 200 are closed, the first electromagnetic valve 13 and the second electromagnetic valve 14 are both closed, the outdoor heat exchanger 4 serves as a condenser, and theindoor heat exchanger 11 serves as an evaporator. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 4 through the oil separator 5 and the first four-way valve 2 to be condensed, then enters theindoor heat exchanger 11 to be evaporated after being throttled by the liquid pipe 7 and the firstelectronic expansion valve 12 of theindoor heat exchanger 11, then flows back to the compressor 1 through the high-low pressure gas pipe 8, the four-way valve and the gas-liquid separator 6, and repeatedly circulates the flow path. The low-pressure gas refrigerant flows through the high-pressure gas pipe 8.

2) Only theindoor module 300 operates as a heating module: at this time, the first four-way valve 2 and the second four-way valve 3 are powered on, the firstelectronic expansion valves 12 of all thehydraulic modules 200 are closed, the first electromagnetic valve 13 and the second electromagnetic valve 14 are both closed, the outdoor heat exchanger 4 serves as an evaporator, and theindoor heat exchanger 11 serves as a condenser. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters theindoor heat exchanger 11 through the oil separator 5, the four-way valve and the high-low pressure air pipe 8 to be condensed, is throttled by the firstelectronic expansion valve 12 of theindoor heat exchanger 11, enters theindoor heat exchanger 11 through the liquid pipe 7 to be evaporated, then flows back to the compressor 1 through the four-way valve and the gas-liquid separator 6, and repeatedly circulates through the flow path. The high-pressure gas refrigerant flows through the high-pressure gas pipe 8.

3) Theindoor module 300 operates in a cooling mode and thehydro module 200 operates in a heating water mode (heat recovery in this case): the appropriate mode can be selected correspondingly according to the refrigerating demand of the multi-connected air conditioner, wherein when the refrigerating demand of the multi-connected air conditioner is large, the following modes can be adopted when the hot water demand is small: at this time, the first four-way valve 2 and the second four-way valve 3 are powered off, the firstelectronic expansion valve 12 of thehydro module 200 is opened, the first solenoid valve 13 is opened, the second solenoid valve 14 is closed, the outdoor heat exchanger 4 serves as a condenser, theindoor heat exchanger 11 serves as an evaporator, and thehydro heat exchanger 10 serves as a condenser. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is divided into two parts after passing through the oil separator 5, one part of the refrigerant enters the outdoor heat exchanger 4 through the first four-way valve 2 to be condensed and then enters the liquid pipe 7, the other part of the high-temperature and high-pressure refrigerant enters thehydraulic heat exchanger 10 through the high-pressure air pipe 9 to be condensed and released heat, the refrigerant is throttled by the firstelectronic expansion valve 12 of thehydraulic heat exchanger 10 and then enters the liquid pipe 7, the two parts of the refrigerant are mixed in the liquid pipe 7 and then enter theindoor heat exchanger 11 to be evaporated, and then the refrigerant flows back to the compressor 1 through the high-low pressure air pipe 8, the second four-way valve 3 and the gas-liquid separator 6 to repeatedly circulate the flow path. The low-pressure gas refrigerant flows through the high-pressure gas pipe 8.

When the multi-split air conditioner has small refrigerating demand and large heating water demand, the following modes can be adopted: at this time, the first four-way valve 2 is powered on and the second four-way valve 3 is powered off, the firstelectronic expansion valve 12 of thehydraulic module 200 is opened, the first electromagnetic valve 13 is opened, the second electromagnetic valve 14 is closed, the outdoor heat exchanger 4 serves as an evaporator, theindoor heat exchanger 11 serves as an evaporator, and thehydraulic heat exchanger 10 serves as a condenser. At the moment, high-temperature and high-pressure refrigerant discharged by the compressor 1 enters thehydraulic heat exchanger 10 through the oil separator 5 and the high-pressure air pipe 9 to be condensed and released heat, then is throttled by the firstelectronic expansion valve 12 of thehydraulic heat exchanger 10 and then is divided into two parts through the liquid inlet pipe 7, a part of the refrigerant enters theindoor heat exchanger 11 to be evaporated and then flows back to the compressor 1 along the high-pressure and low-pressure air pipe 8, the second four-way valve 3 and the gas-liquid separator 6, and the other part of the refrigerant enters the outdoor heat exchanger 4 to be evaporated and absorbed heat and then flows back to the compressor 1 through the first four-way valve 2 and the gas-liquid separator 6, and the flow paths are repeatedly circulated. The refrigerant flowing through the high-low pressure gas pipe 8 is a low-pressure gaseous refrigerant.

4) Theindoor module 300 operates in a heating mode and thehydro module 200 operates in heating water: at this time, the first four-way valve 2 and the second four-way valve 3 are energized, the firstelectronic expansion valve 12 of thehydro module 200 is opened, the first solenoid valve 13 is opened, the second solenoid valve 14 is closed, the outdoor heat exchanger 4 serves as an evaporator, theindoor heat exchanger 11 serves as a condenser, and thehydro heat exchanger 10 serves as a condenser. At the moment, a high-temperature and high-pressure refrigerant discharged by the compressor 1 passes through the oil separator 5 and is divided into two parts, one part of the refrigerant enters thehydraulic heat exchanger 10 through the high-pressure air pipe 9 to be condensed and release heat, then is throttled by the firstelectronic expansion valve 12 of thehydraulic heat exchanger 10 and enters the liquid inlet pipe 7, the other part of the refrigerant enters theindoor heat exchanger 11 through the second four-way valve 3 and the high-low pressure air pipe 8 to be condensed and enters the liquid inlet pipe 7, the two parts of the refrigerant are converged and mixed and flow into the outdoor heat exchanger 4 through the liquid inlet pipe 7 to be evaporated, and then the first refrigerant flows back to the compressor 1 through the four-way valve and the gas-liquid separator 6 to repeatedly circulate the flow paths. The high-pressure gas refrigerant flows through the high-pressure gas pipe 8.

5) Only thehydro module 200 operates with hot water production: at this time, the first four-way valve 2 is powered on, the second four-way valve 3 is powered off, the firstelectronic expansion valve 12 of theindoor heat exchanger 11 is closed, the firstelectronic expansion valve 12 of thehydraulic heat exchanger 10 is opened, the first electromagnetic valve 13 is opened, the second electromagnetic valve 14 is closed, the outdoor heat exchanger 4 serves as an evaporator, theindoor heat exchanger 11 does not work, and thehydraulic heat exchanger 10 serves as a condenser. At the moment, a high-temperature and high-pressure refrigerant discharged by the compressor 1 enters thehydraulic heat exchanger 10 through the high-pressure air pipe 9 to be condensed and released, then is throttled by the firstelectronic expansion valve 12 of thehydraulic heat exchanger 10, enters the outdoor heat exchanger 4 through the liquid pipe 7 to be evaporated, and then flows back to the compressor 1 through the first four-way valve 2 and the gas-liquid separator 6, and the circulating flow path is repeated. The high-low pressure gas pipe 8 is a high-pressure gaseous refrigerant.

6) Theindoor module 300 operates with cooling and thehydro module 200 operates with cooling water: at this time, the first four-way valve 2 and the second four-way valve 3 are powered off, the firstelectronic expansion valve 12 of theindoor heat exchanger 11 is closed, the firstelectronic expansion valve 12 of thehydro heat exchanger 10 is opened, the first electromagnetic valve 13 is closed, the second electromagnetic valve 14 is opened, the outdoor heat exchanger 4 serves as a condenser, theindoor heat exchanger 11 serves as an evaporator, and thehydro heat exchanger 10 serves as an evaporator. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 4 through the oil separator 5 and the first four-way valve 2 to be condensed, then is divided into two parts through the liquid pipe 7 to respectively enter theindoor heat exchanger 11 and thehydraulic heat exchanger 10 to be evaporated, and then respectively enters the high-pressure and low-pressure gas pipe 8, the four-way valve and the gas-liquid separator 6 to flow back to the compressor 1, and the circulation flow path is repeated. The high-low pressure gas pipe 8 is a low-pressure gaseous refrigerant.

7) Only thehydro module 200 is running with chilled water: at this time, the first four-way valve 2 and the second four-way valve 3 are powered off, the firstelectronic expansion valve 12 of theindoor heat exchanger 11 is closed, the firstelectronic expansion valve 12 of thehydraulic heat exchanger 10 is opened, the first electromagnetic valve 13 is closed, the second electromagnetic valve 14 is opened, the outdoor heat exchanger 4 serves as a condenser, theindoor heat exchanger 11 does not work, and thehydraulic heat exchanger 10 serves as an evaporator. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 4 through the oil separator 5 and the first four-way valve 2 to be condensed, then enters thehydraulic heat exchanger 10 through the liquid pipe 7 to be evaporated, and then flows back to the compressor 1 through the high-low pressure gas pipe 8, the second four-way valve 3 and the gas-liquid separator 6 to repeatedly circulate the flow path. The high-low pressure gas pipe 8 is a low-pressure gaseous refrigerant.

Based on each operation module, the multi-split air conditioner can selectively produce hot water and cold water according to the requirement while refrigerating, so that the energy-saving effect is achieved, and the multi-split air conditioner has the characteristic of rich functions.

In this embodiment, the device further includes a liquid pipe stop valve 71 disposed on the liquid pipe 7, a high-lowpressure stop valve 81 disposed on the high-low pressure gas pipe 8, a high-pressure stop valve 91 disposed on the high-pressure gas pipe 9, and a low pressure detection device 15 disposed at the input end of the compressor 1, where the low pressure detection device 15 employs a pressure sensor for detecting and acquiring a low pressure value at the input end of the compressor. When the refrigerant of the system needs to be recovered to the outdoor unit, the predetermined refrigerant recovery mode can be started after the high pressure stop valve 91 is closed as required, and the liquid pipe stop valve 71 is closed after the compressor reaches the predetermined operating frequency during the refrigerant recovery period until the low pressure value monitored by the low pressure detection device 15 is lower than the predetermined pressure value, and the high and lowpressure stop valve 81 is closed, so as to complete the refrigerant recovery mode.

Specifically, the high-pressure stop valve 91 is first closed, and then the refrigerant recovery mode is activated, in which, for the outdoor unit: the compressor 1 runs at the highest frequency, the fan of the outdoor heat exchanger 4 runs at the highest windshield, the first four-way valve 2 and the second four-way valve 3 are powered off, the electronic expansion valve of the outdoor unit is adjusted to the maximum opening degree, and the low-voltage protection of the system is closed; for the indoor module 300: the firstelectronic expansion valves 12 of all theindoor heat exchangers 11 are adjusted to the maximum opening degree, and fans of theindoor heat exchangers 11 run in the highest windshield; for the hydro module 200: the first solenoid valve 13 and the second solenoid valve 14 are opened, and the firstelectronic expansion valve 12 of thehydro heat exchanger 10 is adjusted to the maximum opening degree. At this time, the outdoor unit 100, theindoor module 300, and thehydraulic module 200 keep the above states and continuously operate until the operating frequency of the compressor reaches 60Hz, the liquid pipe stop valve 71 is closed, and then the low pressure detection device 15 is started to continuously monitor and obtain a real-time low pressure value, so that when the low pressure value is monitored to be lower than a predetermined pressure value (preferably 0.05 MPa), the high and lowpressure stop valve 81 is closed, and the refrigerant recovery mode is completed. Through the refrigerant recovery mode, all the refrigerants can be effectively and completely recovered into the outdoor unit 100, and no additional pressure gauge is required to be installed during the recovery period to monitor the pressure, so that the operation is simple, and the recovery efficiency is high.

The above-described embodiments are merely preferred embodiments of the present invention, which are not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents of the embodiments of the invention without departing from the scope of the invention. Therefore, the content of the technical scheme of the utility model, according to the equivalent change made by the idea of the utility model, should be covered in the protection scope of the utility model.

Claims (10)

1. The utility model provides a multiple online system with refrigerant retrieves function, includes off-premises station (100), at least a set of water conservancy module (200) and at least a set of indoor module (300), wherein, off-premises station (100) is including compressor (1), first cross valve (2), second cross valve (3) and outdoor heat exchanger (4), its characterized in that: the output end of the compressor (1) is respectively connected with a D interface of a first four-way valve (2) and a D interface of a second four-way valve (3), the input end of the compressor (1) is respectively connected with an S interface of the first four-way valve (2) and an S interface of the second four-way valve (3), an E interface of the first four-way valve (2) is connected with the S interface of the second four-way valve (3) through a throttling unit, a C interface of the second four-way valve (3) is connected with the S interface of the first four-way valve (2) through a throttling unit, and a C interface of the first four-way valve (2) is connected with an outdoor heat exchanger (4);

the device is characterized by further comprising a liquid pipe (7), a high-low pressure air pipe (8) and a high-pressure air pipe (9), wherein one end of the liquid pipe (7) is connected with the outdoor heat exchanger (4), and the other end of the liquid pipe (7) is respectively connected with the other end of the hydraulic heat exchanger (10) of the hydraulic module (200) and the other end of the indoor heat exchanger (11) of the indoor module (300); one end of the high-pressure air pipe (9) is connected between the four-way valve and the output end of the compressor (1) in a bypass mode, and the other end of the high-pressure air pipe (9) is connected with one end of a hydraulic heat exchanger (10) of the hydraulic module (200); one end of the high-low pressure air pipe (8) is connected with an E interface of the second four-way valve (3), and the other end of the high-low pressure air pipe (8) is respectively connected with one end of a hydraulic heat exchanger (10) of the hydraulic module (200) and one end of an indoor heat exchanger (11) of the indoor module (300);

still including locating liquid pipe stop valve (71) on liquid pipe (7), locate high low pressure stop valve (81) on high low pressure trachea (8), locate high pressure stop valve (91) on high-pressure trachea (9) and locate compressor (1) input end department low pressure detection device (15), wherein, can start predetermined refrigerant recovery mode after closing high pressure stop valve (91) as required, and compressor (1) closes liquid pipe stop valve (71) after reaching predetermined operating frequency during refrigerant recovery, when the low pressure value that low pressure detection device (15) monitored is less than the predetermined pressure value, close high low pressure stop valve 81, in order to accomplish refrigerant recovery mode.

2. The system of claim 1, wherein the refrigerant recovery system further comprises: the oil separator also comprises an oil separator (5) arranged at the output end of the compressor (1).

3. The system of claim 1, wherein the refrigerant recovery system further comprises: the compressor also comprises a gas-liquid separator (6) arranged at the input end of the compressor (1).

4. The system of claim 1, wherein the refrigerant recovery system further comprises: first electronic expansion valves (12) are arranged between the liquid pipe (7) and each hydraulic heat exchanger (10) and each indoor heat exchanger (11).

5. The system of claim 1, wherein the refrigerant recovery system further comprises: comprises at least two compressors (1) which are arranged in parallel.

6. The system of claim 1, wherein the refrigerant recovery system further comprises: and an outdoor electronic expansion valve is arranged at one end of the liquid pipe (7) close to the outdoor heat exchanger (4).

7. The system of claim 1, wherein the refrigerant recovery system further comprises: a first electromagnetic valve (13) is arranged between the high-pressure air pipe (9) and any one hydraulic heat exchanger (10).

8. The system of claim 1, wherein the refrigerant recovery system further comprises: and a second electromagnetic valve (14) is arranged between the high-low pressure air pipe (8) and any one hydraulic heat exchanger (10).

9. The system of claim 1, wherein the refrigerant recovery system further comprises: the throttling unit is a capillary tube.

10. The system of claim 1, wherein the refrigerant recovery system further comprises: the high-pressure air pipe (8) and the low-pressure air pipe (7) are connected with one end of the hydraulic heat exchanger (10) and the indoor heat exchanger (11) through a branch pipe, and the liquid pipe (7) is connected with the hydraulic heat exchanger (10) and the indoor heat exchanger (11) through the branch pipe respectively.

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