CN212690915U - Four-way valve, heat exchange system and air conditioning unit - Google Patents

Abstract

The utility model discloses a cross valve, heat transfer system and air conditioning unit. Wherein, this four-way valve includes: the air-suction pilot valve comprises a main valve and a pilot valve, wherein the pilot valve comprises a first capillary tube, a second capillary tube, a third capillary tube and a fourth capillary tube, and the air exhaust end of the fourth capillary tube is a free end and is used for being communicated with the air suction end of a compressor. Through the utility model discloses, the pressure that can make the low pressure end of the main valve of cross valve is enough low, and then the pressure differential of the piston at the main valve both ends of cross valve when the increase switching-over promotes smooth switching-over.

Description

Four-way valve, heat exchange system and air conditioning unit

Technical Field

The utility model relates to a unit technical field particularly, relates to a cross valve, heat transfer system and air conditioning unit.

Background

In the existing air conditioning system, the four-way valve plays an important role in controlling the flow direction of a refrigerant and is an indispensable component in an air conditioner. Fig. 1 is a structure of a conventional four-way valve, and as shown in fig. 1, a valve body of the four-way valve mainly comprises two parts: the main valve 1 and the pilot valve 2, the pilot valve 2 includes electromagnetic coil and four capillary tubes d, e, c, s, and its main valve 1 has four valve ports D, E, C, S. The four-way valve is reversed mainly by the pressure difference between two ends of the piston, and the normal four-way valve generates the pressure difference by the capillary D communicated with the valve port D and the capillary S communicated with the valve port S in the pilot valve 2, so as to be reversed. When the pressure of a valve port S of the four-way valve is higher, the pressure difference of pistons at the left end and the right end of the four-way valve cannot reach the lowest action pressure difference, and the four-way valve cannot be reversed or cannot be reversed in place.

Aiming at the problem that the differential pressure of pistons at two ends cannot reach the lowest action differential pressure in the prior art, so that the reversing cannot be performed or the reversing cannot be performed in place, an effective solution is not provided at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an in provide a cross valve, heat transfer system and air conditioning unit to solve prior art pressure differential and can not reach minimum action pressure differential, lead to can not the switching-over, or the problem that the switching-over is not in place.

In order to solve the technical problem, the utility model provides a four-way valve, wherein, this four-way valve includes: the pilot valve comprises a first capillary tube, a second capillary tube, a third capillary tube and a fourth capillary tube, wherein the exhaust end of the fourth capillary tube is a free end and is used for being communicated with the suction end of the compressor.

Further, the pilot valve is to: when the direction is not reversed, the second capillary tube and the fourth capillary tube are controlled to be communicated, and the first capillary tube and the third capillary tube are controlled to be communicated;

and when the capillary tube is reversed, the third capillary tube and the fourth capillary tube are controlled to be communicated, and the first capillary tube and the second capillary tube are controlled to be communicated.

Further, the main valve comprises a first valve port, a second valve port, a third valve port and a fourth valve port, wherein the first valve port is used for being communicated with the exhaust end of the compressor, the second valve port and the third valve port are used for being communicated with the heat exchanger, and the fourth valve port is used for being communicated with the suction end of the compressor.

The utility model also provides a heat exchange system, the system comprises a compressor, a four-way valve, a first heat exchanger, a second heat exchanger and a third heat exchanger, and is characterized in that the four-way valve is the four-way valve;

a fourth capillary tube of the four-way valve is communicated with a suction end of a compressor, a first valve port is communicated with a discharge end of the compressor, a second valve port is communicated with the second heat exchanger, a third valve port is communicated with the first heat exchanger, a fourth valve port is communicated with a suction end of the compressor, a pipeline which is connected after the second heat exchanger is converged with the first heat exchanger is communicated with the third heat exchanger, and the third heat exchanger is communicated with the suction end of the compressor;

and the four-way valve is used for switching the conduction of the first heat exchanger or the second heat exchanger through self reversing.

Further, the system further comprises:

and the liquid storage tank is arranged between the pipeline after the second heat exchanger and the first heat exchanger are converged and the third heat exchanger.

Further, the system further comprises:

and the gas-liquid separator is arranged between the fourth valve port of the four-way valve and the air suction end of the compressor.

Further, the system further comprises:

the first throttling device is arranged between the first heat exchanger and the liquid storage tank;

the second throttling device is arranged between the second heat exchanger and the liquid storage tank;

and the third throttling device is arranged between the liquid storage tank and the third heat exchanger.

Further, the first throttle device comprises a first expansion valve and a first one-way valve which are arranged in parallel.

Further, the second throttling means includes:

the capillary tube type electromagnetic valve comprises a first electromagnetic valve, a second one-way valve and a capillary tube, wherein the first electromagnetic valve and the capillary tube are connected in series to form a series branch, and the series branch and the second one-way valve are connected in parallel.

Further, the third throttling device comprises a second expansion valve and a third one-way valve which are arranged in parallel.

Further, the system further comprises:

the reversing valve comprises a first valve port, a second valve port, a third valve port and a fourth valve port;

the first valve port is communicated with the exhaust end of the compressor; the second valve port is communicated with the third heat exchanger; the third valve port is communicated with the first valve port of the four-way valve; the fourth valve port is communicated with a suction end of the compressor;

the reversing valve is used for changing the flow direction of a refrigerant in the system through self reversing.

The utility model also provides an air conditioning unit, including above-mentioned heat transfer system.

Use the technical scheme of the utility model, set up the exhaust end of the fourth capillary that communicates originally with main valve fourth mouth-piece into the free end, when using, communicate the fourth capillary to the suction end of compressor, can make the pressure of the low pressure end of the main valve of cross valve enough low, and then the pressure differential of the piston at the main valve both ends of cross valve when the increase switching-over promotes smooth switching-over.

Drawings

FIG. 1 is a block diagram of a prior art four-way valve;

FIG. 2 is a block diagram of a four-way valve according to an embodiment of the present invention;

fig. 3 is a block diagram of a heat exchange system according to an embodiment of the present invention;

fig. 4 is a block diagram of a heat exchange system according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be understood that although the terms first, second, third, etc. may be used to describe the heat exchangers in the embodiments of the present invention, the heat exchangers should not be limited to these terms. These terms are only used to distinguish between different heat exchangers. For example, a first heat exchanger may also be referred to as a second heat exchanger, and similarly, a second heat exchanger may also be referred to as a first heat exchanger, without departing from the scope of embodiments of the present invention.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.

The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.

Example 1

The embodiment provides a cross valve, fig. 2 is according to the utility model discloses the structure diagram of cross valve, as shown in fig. 2, this cross valve includes main valve 1 and pilot valve 2, pilot valve 2 includes first capillary D, second capillary e, third capillary c and fourth capillary s, the exhaust end of fourth capillary s is the free end, a suction end for communicating the compressor, first valve port D of first capillary D's inlet end intercommunication main valve 1, the left side air chamber of second capillary e's the end intercommunication main valve 1 of giving vent to anger, the right side air chamber of third capillary c's the end intercommunication main valve 1 of giving vent to anger, the end of giving vent to anger of first capillary D, the inlet end of second capillary e, the inlet end of third capillary c and the inlet end of fourth capillary s all communicate with the air chamber in the pilot valve 2.

The pilot valve 2 is used for: when the direction is not reversed, the second capillary tube e and the fourth capillary tube s are controlled to be communicated, and the first capillary tube d and the third capillary tube c are controlled to be communicated; and when the capillary tube is reversed, the third capillary tube c and the fourth capillary tube s are controlled to be communicated, and the first capillary tube d and the second capillary tube e are controlled to be communicated.

Specifically, when the direction is not reversed, the electromagnetic coil controls the conduction between the second capillary e and the fourth capillary s, the first capillary d and the third capillary c are conducted, and the high-pressure gaseous refrigerant flows from the first capillary d to the third capillary c to fill the right air chamber of the main valve 1;

when reversing, the electromagnetic coil controls the conduction between the third capillary c and the fourth capillary s, the conduction between the first capillary d and the second capillary e, the high-pressure gaseous refrigerant flows to the second capillary e from the first capillary d, pushes the left piston of the main valve 1 to move rightwards, and the gas in the right gas chamber flows to the fourth capillary s through the third capillary c and finally returns to the air suction end of the compressor, so that the reversing is realized.

In the four-way valve of the present embodiment, the exhaust end of the fourth capillary tube S, which originally communicates with the fourth port S of the main valve, is set as a free end, and the fourth capillary tube S is communicated to the suction end of the compressor when in use, so that the pressure at the low-pressure end of the main valve of the four-way valve can be sufficiently reduced, and the differential pressure between the pistons at both ends of the main valve 2 of the four-way valve during the change-over can be increased to promote smooth change-over.

In an embodiment, main valve 1 includes a first port D, a second port E, a third port C, and a fourth port S, where the first port D is used for communicating with the exhaust end of the compressor, the second port E and the third port C are used for communicating with the heat exchanger, and the fourth port S is used for communicating with the suction end of the compressor.

Example 2

This embodiment provides a heat transfer system, and fig. 3 is according to the utility model discloses heat transfer system's structure chart, as shown in fig. 3, this heat transfer system includes: the heat exchanger comprises a compressor 3, a four-way valve 7, a first heat exchanger 4, a second heat exchanger 5 and a third heat exchanger 6, and is characterized in that the four-way valve 7 is the four-way valve in the embodiment;

a fourth capillary tube S of the four-way valve 7 is communicated with a suction end of the compressor 3, a first valve port D is communicated with a discharge end of the compressor 3, a second valve port E is communicated with an inlet end of the second heat exchanger 5, a third valve port C is communicated with an inlet end of the first heat exchanger 4, a fourth valve port S is communicated with a suction end of the compressor 3, a pipeline which is connected after an outlet end of the second heat exchanger 5 is converged with an outlet end of the first heat exchanger 4 is communicated with an inlet end of the third heat exchanger 6, and an outlet end of the third heat exchanger 6 is communicated with a suction end of the compressor 3.

The four-way valve 7 is used for switching the conduction of the first heat exchanger 4 or the second heat exchanger 5 through self reversing. Before the four-way valve 7 is switched, the second capillary tube E and the fourth capillary tube S of the pilot valve of the four-way valve 7 are communicated, the first capillary tube D and the third capillary tube C are communicated, a high-pressure gaseous refrigerant flows to the third capillary tube C from the first capillary tube D, then the right air chamber of the main valve 1 is filled, the first valve port D and the third valve port C of the main valve 1 are communicated, the second valve port E and the fourth valve port S are communicated, and then the high-pressure refrigerant discharged by the compressor 3 is controlled to return to the air suction end of the compressor 3 through the first heat exchanger 4 and the third heat exchanger 6.

After the four-way valve 7 is switched, the electromagnetic coil controls the conduction between the third capillary tube C and the fourth capillary tube S, the first capillary tube D and the second capillary tube E are conducted, high-pressure gaseous refrigerant flows to the second capillary tube E from the first capillary tube D, the left piston of the main valve is pushed to move rightwards, gas in the right air chamber flows to the fourth capillary tube S through the third capillary tube C and finally returns to the air suction end of the compressor to realize reversing, so that the first valve port D and the second valve port E of the main valve 1 are conducted, the third valve port C and the fourth valve port S are conducted, and the high-pressure refrigerant discharged by the compressor 3 is controlled to return to the air suction end of the compressor 3 through the second heat exchanger 5 and the third heat exchanger 6.

Example 3

This embodiment provides another kind of heat transfer system, and fig. 4 is according to the utility model discloses another embodiment's heat transfer system's block diagram, as shown in fig. 4, wherein, above-mentioned first heat exchanger 4 is the fin evaporator, and the other fan 14 that is provided with of fin evaporator, second heat exchanger 5 are hot water shell and tube heat exchanger, and third heat exchanger 6 is air conditioner shell and tube condenser.

As shown in fig. 4, the system further includes: and the liquid storage tank 8 is arranged between the pipeline formed by the convergence of the second heat exchanger 5 and the first heat exchanger 4 and the third heat exchanger 6, is used for storing the refrigerant and supplying the refrigerant to the system when the refrigerant of the system is insufficient. The system further comprises: and the gas-liquid separator 9 is arranged between the fourth valve port S of the four-way valve 7 and the air suction end of the compressor 3, and is used for separating liquid refrigerants so as to prevent liquid impact of the compressor.

To achieve throttling, the system further comprises: the first throttling device 10 is arranged between the first heat exchanger 4 and the liquid storage tank 8; the second throttling device 11 is arranged between the second heat exchanger 5 and the liquid storage tank 8; and the third throttling device 12 is arranged between the liquid storage tank 8 and the third heat exchanger 6.

Wherein, the first throttle device 10 comprises a first expansion valve EEV1 and a first check valve V1 which are arranged in parallel; the second throttle device 11 includes: the device comprises a first electromagnetic valve EV1, a second one-way valve V2 and a capillary tube 111, wherein the first electromagnetic valve EV1 is connected with the capillary tube 111 in series to form a series branch, and the series branch is connected with the second one-way valve V2 in parallel; the third throttling device 12 includes a second expansion valve EEV2 and a third check valve V3, which are disposed in parallel.

As shown in fig. 3 mentioned above, before the four-way valve 7 is switched, the second capillary tube E and the fourth capillary tube S of the pilot valve of the four-way valve 7 are conducted, the first capillary tube D and the third capillary tube C are conducted, the high-pressure gaseous refrigerant flows from the first capillary tube D to the third capillary tube C, and then fills the right air chamber of the main valve 1, so that the first valve port D and the third valve port C of the main valve 1 are conducted, the second valve port E and the fourth valve port S are conducted, and thus the high-pressure refrigerant discharged from the compressor 3 is controlled to sequentially pass through the first heat exchanger 4, the first throttling device 10, the liquid storage tank 8, the third throttling device 12, the third heat exchanger 6, the gas-liquid separator 9, and return to the suction end of the compressor 3, so as to realize refrigeration, in order to avoid the backflow of the refrigerant, the fourth valve port S and the gas-liquid separator 9 are further provided with a, a second electromagnetic valve EV2 is also provided between the fourth check valve V4 and the gas-liquid separator 9.

After the four-way valve 7 is switched, the electromagnetic coil controls the conduction between the third capillary tube C and the fourth capillary tube S, the first capillary tube D and the second capillary tube E are conducted, high-pressure gaseous refrigerant flows from the first capillary tube D to the second capillary tube E, the left piston of the main valve is pushed to move rightwards, gas in the right air chamber flows to the fourth capillary tube S through the third capillary tube C, and finally returns to the air suction end of the compressor to realize reversing, so that the first valve port D and the second valve port E of the main valve 1 are conducted, the third valve port C and the fourth valve port S are conducted, and high-pressure refrigerant discharged by the compressor 3 is controlled to return to the air suction end of the compressor 3 through the second heat exchanger 5, the second throttling device 11, the liquid storage tank 8, the third throttling device 12, the third heat exchanger 6 and the gas-liquid separator 9, and meanwhile, refrigeration and hot.

In order to realize the switching of the refrigerant flow direction of the whole system, the system also comprises: the direction-changing valve 13 comprises a first port D1, a second port E1, a third port C1 and a fourth port S1; the first valve port D1 is communicated with the exhaust end of the compressor 3; the second valve port E1 is communicated with the third heat exchanger 6; the third port C1 is communicated with the first port D of the four-way valve 7; the fourth valve port S1 is communicated with the suction end of the compressor 3;

the reversing valve 13 is used for changing the flow direction of the refrigerant in the system through self reversing. In this embodiment, the reversing valve 13 is a four-way valve, before the reversing valve 13 reverses, the first port D1 is communicated with the third port C1, the second port E1 is communicated with the fourth port S1, so that the high-pressure refrigerant discharged from the compressor 3 passes through the first heat exchanger 4 or the second heat exchanger 5 first, and then passes through the third heat exchanger 6, so as to realize independent refrigeration or refrigeration plus hot water production, in order to avoid refrigerant backflow, the fourth port S1 and the gas-liquid separator 9 are further provided with a fifth one-way valve V5, and in addition, in order to control whether the refrigerant is communicated, a third electromagnetic valve EV3 is further arranged between the fifth one-way valve V5 and the gas-liquid separator 9; after the reversing valve 13 reverses, the first valve port D1 is communicated with the second valve port E1, and the third valve port C1 is communicated with the fourth valve port S1, so that the high-pressure refrigerant discharged from the compressor 3 passes through the third heat exchanger 6, and then passes through the first heat exchanger 4 or the second heat exchanger 5, and thus, independent heating or heating and cooling water is realized.

Example 4

The embodiment provides a heat exchange system, is applied to air conditioning unit, combines above-mentioned figure 4 to explain the utility model discloses an embodiment, includes first heat exchanger 4, second heat exchanger 5 and the three heat exchanger of third heat exchanger 6, cross valve 7 and switching-over valve 13 at least in this embodiment, first throttling arrangement 10, second throttling arrangement 11, a plurality of throttling arrangement of third throttling arrangement 12, compressor 3, wherein, above-mentioned first heat exchanger 4 is the fin evaporator, the other fan 14 that is provided with of first heat exchanger 4, second heat exchanger 5 is hot water shell and tube heat exchanger, third heat exchanger 6 is air conditioner shell and tube condenser.

When the device is used, only two heat exchangers can be conducted, such as the first heat exchanger 4 and the third heat exchanger 6, or the second heat exchanger 5 and the third heat exchanger 6, and one of the first heat exchanger 4 or the second heat exchanger 5 is idle. In order to ensure that the idle heat exchanger is not communicated with the conducted heat exchanger when the air conditioning system is used, and the pressure of the idle heat exchanger is very high when the ambient temperature or the water temperature is high, the pressure of the fourth capillary tube S is higher than that of the idle heat exchanger due to the fact that the fourth capillary tube S is communicated with the fourth valve port S by the aid of the common four-way valve, and therefore the pressure of the fourth capillary tube S is not as high as that of the idle heat exchanger, a large pressure difference cannot be formed between the fourth capillary tube S and the first capillary tube d, and the.

In the four-way valve 7 of the present embodiment, the fourth capillary tube S in the original pilot valve 2, which is communicated with the fourth valve port S, is disconnected, so that the fourth capillary tube S is no longer connected to the fourth valve port S, but is directly communicated to the suction end of the compressor 3, so as to ensure that the fourth capillary tube S is communicated with the low pressure side at any time, and thus a larger pressure difference is formed when the four-way valve 7 is reversed.

In summer, the system operates in a refrigerating mode, high-pressure refrigerant discharged from the exhaust end of the compressor 3 returns to the air suction end of the compressor 3 through the first heat exchanger 4, the first throttling device 10, the liquid storage tank 8, the third throttling device 12, the third heat exchanger 6 and the gas-liquid separator 9, and refrigeration is achieved.

After the mode is switched, the operation of refrigeration and hot water production is performed, the four-way valve 7 in the control system is reversed, so that the high-pressure refrigerant discharged from the exhaust end of the compressor 3 firstly passes through the second heat exchanger 5, the second throttling device 11, the liquid storage tank 8, the third throttling device 12, the third heat exchanger 6 and the gas-liquid separator 9 and returns to the suction end of the compressor 3, and refrigeration and hot water production are realized at the same time. At this time, if the existing four-way valve is adopted as the four-way valve 7, the second port E and the fourth port S of the four-way valve 7 are communicated due to high temperature of the original hot water, and the pressure of the second port E is higher and the pressure of the fourth port S is higher, the pressure difference formed by the first port D and the fourth port S is very small, and the four-way valve cannot be reversed as required.

If the four-way valve in the above embodiment 1 is adopted, the fourth capillary tube S is communicated with the gas-liquid separator 9 at the suction end of the compressor 3, and since the gas-liquid separator 9 is communicated with the suction end of the compressor 3 when in operation and the pressure is very low, the fourth capillary tube S in the four-way valve 7 is always communicated with the suction end of the compressor 3 with lower air pressure, and through the connection of the pilot valve 2, the fourth valve port S can easily establish a pressure difference with the first valve port D, thereby increasing the thrust generated when the main valve of the four-way valve 7 is reversed, and smoothly reversing the four-way valve 7.

Example 5

The embodiment provides an air conditioning unit, including above-mentioned heat transfer system for realize the smooth switching-over of cross valve, and then the flow direction of fast switch-over refrigerant.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (12)

1. A four-way valve comprises a main valve (1) and a pilot valve (2), wherein the pilot valve (2) comprises a first capillary tube d, a second capillary tube e, a third capillary tube c and a fourth capillary tube s, and is characterized in that the exhaust end of the fourth capillary tube s is a free end and is used for being communicated with the suction end of a compressor.

2. The four-way valve according to claim 1, wherein the pilot valve (2) is configured to:

when the direction is not reversed, the second capillary tube e and the fourth capillary tube s are controlled to be communicated, and the first capillary tube d and the third capillary tube c are controlled to be communicated;

and when the capillary tube is reversed, the third capillary tube c and the fourth capillary tube s are controlled to be communicated, and the first capillary tube d and the second capillary tube e are controlled to be communicated.

3. Four-way valve according to claim 1, wherein the main valve (1) comprises a first port D for communicating with the discharge side of the compressor, a second port E and a third port C for communicating with the heat exchanger, and a fourth port S for communicating with the suction side of the compressor.

4. A heat exchange system comprising a compressor (3), a four-way valve (7), a first heat exchanger (4), a second heat exchanger (5) and a third heat exchanger (6), wherein the four-way valve (7) is a four-way valve according to any one of claims 1 to 3;

a fourth capillary tube S of the four-way valve (7) is communicated with a suction end of a compressor (3), a first valve port D is communicated with a discharge end of the compressor (3), a second valve port E is communicated with the second heat exchanger (5), a third valve port C is communicated with the first heat exchanger (4), a fourth valve port S is communicated with a suction end of the compressor (3), a pipeline connected after the second heat exchanger (5) and the first heat exchanger (4) are converged is communicated with the third heat exchanger (6), and the third heat exchanger (6) is communicated with a suction end of the compressor (3);

and the four-way valve (7) is used for switching the conduction of the first heat exchanger (4) or the second heat exchanger (5) through self reversing.

5. The system of claim 4, further comprising:

and the liquid storage tank (8) is arranged between a pipeline formed by converging the second heat exchanger (5) and the first heat exchanger (4) and the third heat exchanger (6).

6. The system of claim 5, further comprising:

and the gas-liquid separator (9), wherein the gas-liquid separator (9) is arranged between the fourth valve port S of the four-way valve (7) and the air suction end of the compressor (3).

7. The system of claim 5, further comprising:

the first throttling device (10) is arranged between the first heat exchanger (4) and the liquid storage tank (8);

the second throttling device (11) is arranged between the second heat exchanger (5) and the liquid storage tank (8);

and the third throttling device (12) is arranged between the liquid storage tank (8) and the third heat exchanger (6).

8. The system of claim 7, wherein the first throttle device (10) includes a first expansion valve (EEV1) and a first check valve (V1) arranged in parallel.

9. The system according to claim 7, characterized in that said second throttling means (11) comprise:

the device comprises a first solenoid valve (EV1), a second one-way valve (V2) and a capillary tube (111), wherein the first solenoid valve (EV1) is connected with the capillary tube (111) in series to form a series branch, and the series branch is connected with the second one-way valve (V2) in parallel.

10. The system according to claim 7, wherein the third throttling device (12) comprises a second expansion valve (EEV2) and a third check valve (V3) arranged in parallel.

11. The system of claim 4, further comprising:

a direction-changing valve (13) which comprises a first port D1, a second port E1, a third port C1 and a fourth port S1;

the first valve port D1 is communicated with the exhaust end of the compressor (3); the second valve port E1 is communicated with the third heat exchanger (6); the third valve port C1 is communicated with a first valve port D of the four-way valve (7); the fourth valve port S1 is communicated with the suction end of the compressor (3);

the reversing valve (13) is used for changing the flow direction of a refrigerant in the system through self reversing.

12. An air conditioning assembly comprising the heat exchange system of any one of claims 4 to 11.

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