CN214469438U

CN214469438U - Stable and reliable double-four-way valve multi-split system

Info

Publication number: CN214469438U
Application number: CN202023320007.1U
Authority: CN
Inventors: 刘红斌; 麦享世
Original assignee: Guangdong Jiwei Technology Co Ltd
Current assignee: Guangdong Jiwei Technology Co Ltd; Guangdong Giwee Technology Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-10-22
Anticipated expiration: 2030-12-31

Abstract

The utility model discloses a stable and reliable double four-way valve multi-split system, which comprises an outdoor unit, at least one group of hydraulic modules, at least one group of indoor modules, a liquid pipe, a high-low pressure air pipe and a high pressure air pipe, wherein a first electromagnetic valve is arranged on a pipeline between the high pressure air pipe and any one hydraulic heat exchanger, and the forward end and the reverse end of the first electromagnetic valve are respectively connected with the hydraulic heat exchanger and the high pressure air pipe correspondingly; and a one-way valve and a second electromagnetic valve are arranged on a pipeline between the high-low pressure air pipe and each hydraulic heat exchanger, the outlet end and the inlet end of the one-way valve are respectively connected with the high-low pressure air pipe and the forward end of the second electromagnetic valve, and the reverse end of the second electromagnetic valve is connected with the hydraulic heat exchanger.

Description

Stable and reliable double-four-way valve multi-split system

Technical Field

The utility model belongs to the technical field of the technique of many online air conditioning systems and specifically relates to indicate a reliable and stable two cross valves many online systems.

Background

The conventional hydraulic modules are matched with the outdoor unit, and one hydraulic module is matched with one outdoor unit, so that the connecting pipe of the conventional hydraulic module is 2 pipes, the throttling component of the system is arranged on the outdoor unit, and the hydraulic module is not provided with the throttling component.

In a common system of a three-pipe multi-split air conditioner with a hydraulic module, because the hydraulic module is two pipes, a switching device needs to be installed between an outdoor unit and the hydraulic module, three pipes are arranged on one side of the switching device connected with the outdoor unit, and two pipes are arranged on one side connected with a hydraulic module and an indoor unit. This has a problem in that, if a user installs only the indoor unit of the air conditioner without installing the hydro module, a switching device must be installed between the indoor unit and the outdoor unit, thereby causing an increase in cost and a troublesome installation, and also causing a great trouble in electric control. In addition, in a common system with a three-pipe multi-split air conditioner and a hydraulic module, when the hydraulic module is not started, a pipeline refrigerant is closed due to the fact that no cutoff device is arranged, the possibility of refrigerant leakage exists, and energy waste or freezing and explosion of the pipeline are caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's not enough, provide a two cross valves multi-split system that the function is abundant, reliable and stable.

In order to realize foretell purpose, the utility model provides a reliable and stable two cross valves multi-split system, including off-premises station, at least a set of water conservancy module and at least a set of indoor module, wherein, the off-premises station is including compressor, first cross valve, second cross valve and outdoor heat exchanger, its characterized in that: the hydraulic heat exchanger comprises a hydraulic module, a hydraulic heat exchanger and a hydraulic module, and is characterized by further comprising 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 each group of hydraulic modules 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, the other end of the high-pressure air pipe is connected with one end of each group of hydraulic heat exchangers of the hydraulic modules respectively, a first electromagnetic valve is arranged on a pipeline between the high-pressure air pipe and any one hydraulic heat exchanger, and the forward end and the reverse end of the first electromagnetic valve are correspondingly connected with the hydraulic heat exchangers and the high-pressure air pipe respectively; one end of the high-low pressure air pipe is connected with an interface E of the second four-way valve, the other end of the high-low pressure air pipe is 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 respectively, a one-way valve and a second electromagnetic valve are arranged on a pipeline between the high-low pressure air pipe and each hydraulic heat exchanger, the outlet end and the inlet end of each one-way valve are connected with the positive ends of the high-low pressure air pipe and the second electromagnetic valve respectively, and the reverse end of each second electromagnetic valve is connected with the hydraulic heat exchanger.

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, the high-low pressure air pipe is connected with one end of each group of hydraulic heat exchangers and each group of indoor heat exchangers through a branch pipe, and the liquid pipe is connected with each group of hydraulic heat exchangers and each group of indoor heat exchangers through the branch pipe.

The utility model adopts the above technical scheme, its beneficial effect lies in: through the forward design of first solenoid valve and the forward design of check valve cooperation second solenoid valve to when the water conservancy module is inoperative, can turn off the refrigerant flow of this water conservancy module completely, avoid the risk of refrigerant leakage and the waste of cold source, especially avoided because of the refrigerant leaks and arouse that the water pipe line is frozen the problem of exploding and take place, more add reliable and more stable, energy-conservation.

Drawings

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

Fig. 2 is a schematic view of the connection composition of the hydro modules.

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 electromagnetic valve, 14-second electromagnetic valve and 15-one-way 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 conditioner includes an outdoor unit 100, at least one group of hydraulic modules 200, and at least one group of indoor modules 300, and for convenience of explanation of the present embodiment, two groups of hydraulic modules 200 arranged in parallel and three groups of indoor 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.

Referring to fig. 2, in the present embodiment, each hydro module 200 includes a hydro heat exchanger 10. Each indoor module 300 includes an indoor heat exchanger 11. The heat exchanger also comprises 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 and the other end of the indoor heat exchanger 11. An interface E of the second four-way valve 3 is connected with one end of a high-low pressure air pipe 8, the other end of the high-low pressure air pipe 8 is connected with one end of a hydraulic heat exchanger 10 and one end of an indoor heat exchanger 11 through a branch pipe respectively, wherein a one-way valve 15 and a second electromagnetic valve 14 are arranged on a pipeline between the high-low pressure air pipe 8 and each hydraulic heat exchanger 10, the outlet end and the inlet end of the one-way valve 15 are connected with the forward ends of the high-low pressure air pipe 8 and the second electromagnetic valve 14 respectively, and the reverse end of the second electromagnetic valve 14 is connected with the hydraulic heat exchanger 10. 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, the other end of the high-pressure air pipe 9 is connected with one end of the hydraulic heat exchanger 10, a first electromagnetic valve 13 is arranged on a pipeline between the high-pressure air pipe 9 and any one hydraulic heat exchanger 10, and the forward end and the reverse end of the first electromagnetic valve 13 are respectively connected with the hydraulic heat exchanger 10 and the high-pressure air pipe 9 correspondingly. Specifically, the solenoid valve has characteristics of high forward pressure resistance and low reverse pressure resistance, and thus a refrigerant leakage is likely to occur when the reverse pressure is high. Therefore, when the hydraulic module 200 is in the hot water mode, the first electromagnetic valve 13 needs to be opened, the second electromagnetic valve 14 needs to be closed, and one end of the high-low pressure gas pipe 8 close to the hydraulic module 200 is in the low-pressure state, so that the forward direction of the second electromagnetic valve 14 needs to be the direction from the hydraulic module 200 to the high-low pressure gas pipe, but when the indoor module 300 is heated and the hydraulic module 200 is stopped, the first electromagnetic valve 13 and the second electromagnetic valve 14 need to be closed, at this time, one end of the high-low pressure pipe 8 close to the hydraulic module 200 is in the high-pressure state, and the hydraulic heat exchanger 10 of the hydraulic module 200 is in the low-pressure state, and if the check valve 15 is not arranged, even if the second electromagnetic valve 14 is closed, the refrigerant in the high-low pressure gas pipe leaks into the hydraulic heat exchanger 10 through the second electromagnetic valve 14 due to the difference in reverse pressure resistance, therefore, the one-way valve 15 is additionally arranged, so that the refrigerant can only flow from the hydraulic heat exchanger 10 to the high-low pressure air pipe 8, but cannot flow from the high-low pressure air pipe 8 to the hydraulic heat exchanger 10 through the second electromagnetic valve 14, and the problem of refrigerant leakage is effectively avoided.

Furthermore, a first electronic expansion valve 12 is arranged between the liquid pipe 7 and each hydraulic heat exchanger 10 and each indoor 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, when any hydraulic module 200 is in the hot water mode, the first electronic expansion valve 12 of the hydraulic heat exchanger 10 is opened, the first solenoid valve 13 is opened, and the second solenoid valve 14 is closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor enters the hydraulic heat exchanger 10 through the high-pressure air pipe 9 and the first solenoid valve 13 to be condensed and released, and then flows to the liquid pipe 7 through the first electronic expansion valve 12. When any hydraulic module 200 starts the cooling water mode, the first electronic expansion valve 12 of the hydraulic heat exchanger 10 is opened, the first electromagnetic valve 13 is closed, and the second electromagnetic valve 14 is opened, so that the refrigerant sent from the liquid pipe enters the hydraulic heat exchanger 10 after being throttled by the first electronic expansion valve 12 to be evaporated and absorb heat, and then flows to the high-low pressure gas pipe 8 through the second electromagnetic valve 14.

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

1) only the indoor 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 first electronic expansion valves 12 of all the hydraulic 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 the indoor 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 the indoor heat exchanger 11 to be evaporated after being throttled by the liquid pipe 7 and the first electronic expansion valve 12 of the indoor 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 the indoor 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 first electronic expansion valves 12 of all the hydraulic 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 the indoor heat exchanger 11 serves as a condenser. At this time, the high-temperature and high-pressure refrigerant discharged from the compressor 1 enters the indoor 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 first electronic expansion valve 12 of the indoor heat exchanger 11, enters the indoor 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) The indoor module 300 operates in a cooling mode and the hydro 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 first electronic expansion valve 12 of the hydro 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, the indoor heat exchanger 11 serves as an evaporator, and the hydro 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 the hydraulic heat exchanger 10 through the high-pressure air pipe 9 to be condensed and released heat, the refrigerant is throttled by the first electronic expansion valve 12 of the hydraulic 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 the indoor 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 first electronic expansion valve 12 of the hydraulic 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, the indoor heat exchanger 11 serves as an evaporator, and the hydraulic heat exchanger 10 serves as a condenser. At the moment, high-temperature and high-pressure refrigerant discharged by the compressor 1 enters the hydraulic 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 first electronic expansion valve 12 of the hydraulic heat exchanger 10 and then is divided into two parts through the liquid inlet pipe 7, a part of the refrigerant enters the indoor 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) The indoor module 300 operates in a heating mode and the hydro 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 first electronic expansion valve 12 of the hydro 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, the indoor heat exchanger 11 serves as a condenser, and the hydro 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 the hydraulic heat exchanger 10 through the high-pressure air pipe 9 to be condensed and release heat, then is throttled by the first electronic expansion valve 12 of the hydraulic heat exchanger 10 and enters the liquid inlet pipe 7, the other part of the refrigerant enters the indoor 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 the hydro 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 first electronic expansion valve 12 of the indoor heat exchanger 11 is closed, the first electronic expansion valve 12 of the hydraulic 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, the indoor heat exchanger 11 does not work, and the hydraulic heat exchanger 10 serves as a condenser. At the moment, a high-temperature and high-pressure refrigerant discharged by the compressor 1 enters the hydraulic heat exchanger 10 through the high-pressure air pipe 9 to be condensed and released, then is throttled by the first electronic expansion valve 12 of the hydraulic 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) The indoor module 300 operates with cooling and the hydro 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 first electronic expansion valve 12 of the indoor heat exchanger 11 is closed, the first electronic expansion valve 12 of the hydro 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, the indoor heat exchanger 11 serves as an evaporator, and the hydro heat exchanger 10 serves as an evaporator. At the moment, high-temperature and high-pressure refrigerant discharged by the compressor 1 enters the outdoor heat exchanger 4 for condensation after passing through the oil separator 5 and the first four-way valve 2, then is divided into two parts by the liquid pipe 7 and respectively enters the indoor heat exchanger 11 and the hydraulic heat exchanger 10 for evaporation, then the refrigerant at the indoor heat exchanger 11 enters the high-low pressure gas pipe 8, the second four-way valve 3 and the gas-liquid separator 6 and flows back to the compressor 1, the refrigerant at the hydraulic heat exchanger 10 enters the high-low pressure gas pipe 8, the second four-way valve and the gas-liquid separator 6 through the second electromagnetic valve 14 and the one-way valve 15 and flows 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 the hydro 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 first electronic expansion valve 12 of the indoor heat exchanger 11 is closed, the first electronic expansion valve 12 of the hydraulic 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, the indoor heat exchanger 11 does not work, and the hydraulic 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 the hydraulic heat exchanger 10 through the liquid pipe 7 to be evaporated, and then flows back to the compressor 1 through the second electromagnetic valve 14, the one-way valve 15, 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.

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

1. The utility model provides a reliable and stable two cross valve multi-split system, 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 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 each group of hydraulic modules (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, the other end of the high-pressure air pipe (9) is connected with one end of each group of hydraulic heat exchangers (10) of the hydraulic modules (200), a first electromagnetic valve (13) is arranged on a pipeline between the high-pressure air pipe (9) and any one hydraulic heat exchanger (10), and the forward end and the reverse end of the first electromagnetic valve (13) are correspondingly connected with the hydraulic heat exchangers (10) and the high-pressure air pipe (9) respectively; one end of the high-low pressure air pipe (8) is connected with an interface E of the second four-way valve (3), the other end of the high-low pressure air pipe (8) is 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) respectively, a check valve (15) and a second electromagnetic valve (14) are arranged on a pipeline between the high-low pressure air pipe (8) and each hydraulic heat exchanger (10), the outlet end and the inlet end of the check valve (15) are connected with the forward ends of the high-low pressure air pipe (8) and the second electromagnetic valve (14) respectively, and the reverse end of the second electromagnetic valve (14) is connected with the hydraulic heat exchanger (10).

2. The stable and reliable double-four-way valve multi-split system as claimed in claim 1, wherein: the oil separator also comprises an oil separator (5) arranged at the output end of the compressor (1).

3. The stable and reliable double-four-way valve multi-split system as claimed in claim 1, wherein: the compressor also comprises a gas-liquid separator (6) arranged at the input end of the compressor (1).

4. The stable and reliable double-four-way valve multi-split system as claimed in claim 1, wherein: 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 stable and reliable double-four-way valve multi-split system as claimed in claim 1, wherein: comprises at least two compressors (1) which are arranged in parallel.

6. The stable and reliable double-four-way valve multi-split system as claimed in claim 1, wherein: 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 stable and reliable double-four-way valve multi-split system as claimed in claim 1, wherein: the high-pressure air pipe (8) and the low-pressure air pipe are connected with one end of each group of hydraulic heat exchangers (10) and each group of indoor heat exchangers (11) through a branch pipe, and the liquid pipe (7) is connected with each group of hydraulic heat exchangers (10) and each group of indoor heat exchangers (11) through the branch pipe.