CN216769839U - Air conditioner - Google Patents

Abstract

The utility model provides an air conditioner, and relates to the technical field of air conditioners. Under the condition that the first pipe section is defrosted, the first four-way valve conducts the outlet of the compressor to be communicated with the first heat exchanger, and the first connecting pipe is communicated with the outlet of the compressor; the second four-way valve conducts a second connecting pipe and a second pipe section of the first heat exchanger and the first pipe section; the third four-way valve conducts the first pipe section and the second connecting pipe, and the second pipe section and the first connecting pipe; under the condition that the second pipe section is defrosted, the first four-way valve conducts the outlet of the compressor and the first heat exchanger, and the first connecting pipe and the outlet of the compressor; the second four-way valve conducts the first heat exchanger and the second pipe section, and the second connecting pipe and the first pipe section; the third four-way valve conducts the second pipe section and the second connecting pipe, and the first pipe section and the first connecting pipe. The defrosting purpose of the second heat exchanger can be achieved while the indoor temperature is guaranteed.

Description

Air conditioner

Technical Field

The utility model relates to the technical field of air conditioners, in particular to an air conditioner.

Background

The air conditioner is widely applied to daily life, the air conditioner is mainly in a heating mode and a cooling mode, the heating mode is operated for a long time in winter, the frosting condition of a heat exchanger of the outdoor unit is easily caused, the heating effect of the whole air conditioner is poor, particularly in the winter environment in the north, the heating effect in the low-temperature environment is poor, and if the frosting condition of the heat exchanger of the outdoor unit is caused, the heating effect is basically lost. In order to defrost as quickly as possible, most air conditioners adopt reverse cycle defrosting, and the temperature fluctuation in a room is large when the reverse defrosting is adopted, so that the user experience is poor.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem of ensuring the experience of a user while defrosting.

To solve the above problems, the present invention provides an air conditioner.

In a first aspect, an embodiment of the present invention provides an air conditioner, where the air conditioner includes a first heat exchanger, a first four-way valve, a compressor, a second heat exchanger, a first expansion valve, a second four-way valve, a third four-way valve, a first connection pipe, and a second connection pipe, the first heat exchanger is disposed indoors, the second heat exchanger is disposed outdoors, the second heat exchanger includes a first pipe segment and a second pipe segment, the first expansion valve is disposed on the second connection pipe, the first four-way valve is respectively communicated with an inlet and an outlet of the compressor, an end of the first connection pipe, and the first heat exchanger, the second four-way valve is respectively communicated with an end of the second connection pipe, an end of the first heat exchanger far away from the first four-way valve, an end of the first pipe segment, and an end of the second pipe segment, the third four-way valve is respectively communicated with an end of the first pipe segment far away from the second four-way valve, and a third four-way valve is respectively communicated with an end of the first pipe segment far away from the second four-way valve, One end of the second pipe section, which is far away from the second four-way valve, one end of the second connecting pipe, which is far away from the second four-way valve, and one end of the first connecting pipe, which is far away from the first four-way valve, are connected;

under the condition that the first pipe section is defrosted, the first four-way valve conducts the outlet of the compressor to be communicated with the first heat exchanger, and the first connecting pipe is communicated with the outlet of the compressor; the second four-way valve conducts the first heat exchanger and the first pipe section, and the second connecting pipe and the second pipe section; the third four-way valve conducts the first pipe section and the second connecting pipe, and the second pipe section and the first connecting pipe;

under the condition that the second pipe section is defrosted, the first four-way valve conducts the outlet of the compressor and the first heat exchanger, and the first connecting pipe and the outlet of the compressor; the second four-way valve conducts the first heat exchanger and the second pipe section, and the second connecting pipe and the first pipe section; the third four-way valve conducts the second pipe section and the second connecting pipe, and the first pipe section and the first connecting pipe.

The second heat exchanger arranged outdoors comprises a first pipe section and a second pipe section which are connected with each other, under the condition that the first pipe section is defrosted, high-temperature high-pressure heat exchange medium flowing out of an outlet of the compressor enters the first heat exchanger arranged indoors through the first four-way valve, forms high-temperature high-pressure heat exchange medium after exchanging heat with indoor air, enters the first pipe section through the second four-way valve, forms low-temperature high-pressure heat exchange medium after defrosting and exchanging heat for the first pipe section, forms low-temperature low-pressure heat exchange medium after throttling through the first expansion valve, and finally flows back to the compressor after exchanging heat for the second pipe section to form high-temperature low-pressure heat exchange medium. That is to say, under the condition that the first pipe section defrosts, the working principle of the first pipe section is the same as that of the first heat exchanger, and the air conditioner can defrost the first pipe section while heating indoor air, namely, the first pipe section is defrosted by using the waste heat of the heat exchange medium, so that the indoor environment temperature can be ensured not to be reduced while defrosting, and the user experience is improved while defrosting.

Similarly, under the condition of defrosting of the second pipe section, the high-temperature and high-pressure heat exchange medium flowing out of the outlet of the compressor enters the first heat exchanger arranged indoors, forms a high-temperature and high-pressure heat exchange medium after exchanging heat with indoor air, then enters the second pipe section, forms a low-temperature and high-pressure heat exchange medium after defrosting and exchanging heat for the second pipe section, forms a low-temperature and low-pressure heat exchange medium after throttling through the first expansion valve, forms a high-temperature and low-pressure heat exchange medium after exchanging heat for the first pipe section, and finally flows back to the compressor. That is to say, under the condition of second pipeline section defrosting, the theory of operation of second pipeline section and first heat exchanger is the same, and the air conditioner can also defrost the second pipeline section when heating indoor air, utilizes heat transfer medium's waste heat to defrost the second pipeline section promptly, can guarantee that indoor ambient temperature does not descend when defrosting, has improved user experience and has felt when defrosting.

That is, the air conditioner can defrost the first section while heating indoor air under the condition that the first section is defrosted. The air conditioner can defrost the second duct section while heating indoor air under the condition that the second duct section is defrosted. The defrosting purpose of the second heat exchanger can be achieved while the indoor temperature is guaranteed.

In an optional embodiment of the present invention, the air conditioner further includes a third connecting pipe and a second expansion valve, one end of the first heat exchanger, which is far away from the first four-way valve, is connected to the second four-way valve through the third connecting pipe, and the second expansion valve is disposed on the third connecting pipe;

under the conditions of defrosting of the first pipe section and defrosting of the second pipe section, the second expansion valve is opened to the maximum opening degree, and the first expansion valve is opened to a first preset opening degree; wherein the first preset opening degree is less than half of the maximum opening degree of the first expansion valve;

under the condition that the air conditioner is in a heating mode, the first expansion valve is opened to the maximum opening degree, and the second expansion valve is opened to a second preset opening degree; wherein the second preset opening degree is smaller than half of the maximum opening degree of the second expansion valve.

In an alternative embodiment of the present invention, the second four-way valve includes a first port, a second port, a third port and a fourth port, the first port is connected to the third connection pipe, the second port is connected to the second connection pipe, the third port is connected to the first pipe section, and the fourth port is connected to the second pipe section;

under a condition that the first tube section is defrosted, the first valve port is communicated with the third valve port, and the second valve port is communicated with the fourth valve port;

the first valve port is communicated with the fourth valve port under the condition that the second pipe section is defrosted; the second valve port is communicated with the third valve port;

and under the condition that the air conditioner is in a heating mode, the first valve port is communicated with the third valve port and the fourth valve port.

In an optional embodiment of the present invention, the third four-way valve includes a first connection port, a second connection port, a third connection port, and a fourth connection port, the first connection port is connected to the second connection pipe, the second connection port is connected to the first connection pipe, the third connection port is connected to the first pipe section, and the fourth connection port is connected to the second pipe section;

under the condition that the first pipe section is defrosted, the first connecting port is communicated with the third connecting port, and the second connecting port is communicated with the fourth connecting port;

under the condition that the second pipe section is defrosted, the first connecting port is communicated with the fourth connecting port, and the second connecting port is communicated with the third connecting port;

and under the condition that the air conditioner is in a heating mode, the third connecting port is communicated with the second connecting port, and the fourth connecting port is communicated with the second connecting port.

In an optional embodiment of the present invention, the first four-way valve includes a first conduction port, a second conduction port, a third conduction port and a fourth conduction port, the first conduction port communicates with an inlet of the compressor, the second conduction port communicates with an outlet of the compressor, the third conduction port communicates with the first heat exchanger, and the fourth conduction port communicates with a first connection pipe;

under the condition that the first pipe section is defrosted, the second pipe section is defrosted and the air conditioner is in a heating mode, the first conduction opening is communicated with the fourth conduction opening, and the second conduction opening is communicated with the third conduction opening.

In an optional embodiment of the present invention, under a condition that the air conditioner is in a heating mode, the second four-way valve respectively conducts the first heat exchanger and the first pipe section, and the first heat exchanger and the second pipe section, and the third four-way valve respectively conducts the first pipe section and an inlet of the compressor, and the second pipe section and an inlet of the compressor.

Drawings

Fig. 1 is a schematic structural diagram of an air conditioner under a first-stage defrosting condition according to a first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an air conditioner according to a first embodiment of the present invention under a second-duct defrosting condition.

Fig. 3 is a schematic structural diagram of an air conditioner in a heating mode according to a first embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an air conditioner in a cooling mode according to a first embodiment of the present invention.

Description of reference numerals:

100-an air conditioner; 110 — a first heat exchanger; 120-a first four-way valve; 122-a first conduction port; 124-a second conduction port; 126-a third conduction port; 128-a fourth conduction port; 130-a compressor; 140-a second heat exchanger; 141-a first tube section; 143-a second tube section; 150-a first expansion valve; 160-a second four-way valve; 162-first valve port; 164-second valve port; 166-third port; 168-fourth valve port; 170-a third four-way valve; 172-a first connection port; 174-a second connection port; 176-a third connection port; 178-fourth connection port; 182-a first connection pipe; 184-a second connecting pipe; 186-third connecting tube; 190 — a second expansion valve.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

First embodiment

Referring to fig. 1 and fig. 2, the present embodiment provides an air conditioner 100, and the air conditioner 100 provided in the present embodiment can ensure that the indoor environment temperature does not decrease while defrosting, and improve the user experience while defrosting.

The air conditioner 100 is widely used in daily life, the air conditioner 100 mainly uses a heating mode and a cooling mode, and the heating mode is operated for a long time in winter, which easily causes the frosting of the heat exchanger of the outdoor unit, resulting in poor heating effect of the whole air conditioner 100, especially in winter in north, the heating effect is poor originally in low temperature environment, and if the heat exchanger of the outdoor unit frosts, the heating effect is basically lost. In order to defrost as quickly as possible, most of the air conditioners 100 employ reverse cycle defrosting, and the temperature fluctuation in the room is large when reverse defrosting is employed, which results in poor user experience. Other defrosting modes have small indoor temperature fluctuation relative to a reverse cycle, but the structure is relatively complex, so that the cost is high, and the defrosting effect is not satisfactory. The air conditioner 100 provided by this embodiment can improve the above problem, and the air conditioner 100 provided by this embodiment adopts a regional defrosting mode under the condition of the heating mode, so that the indoor environment temperature can be ensured not to drop while defrosting, and the user experience is improved while defrosting.

Referring to fig. 1 and 2, the direction of the arrows in fig. 1 and 2 indicate the flow direction of the heat exchange medium. In this embodiment, the air conditioner 100 includes a first heat exchanger 110, a first four-way valve 120, a compressor 130, a second heat exchanger 140, a first expansion valve 150, a second four-way valve 160, a third four-way valve 170, a first connection pipe 182, and a second connection pipe 184, the first heat exchanger 110 is disposed indoors, the second heat exchanger 140 is disposed outdoors, the second heat exchanger 140 includes a first pipe section 141 and a second pipe section 143, the first expansion valve 150 is disposed on the second connection pipe 184, the first four-way valve 120 is respectively communicated with an inlet and an outlet of the compressor 130, an end of the first connection pipe 182, and the first heat exchanger 110, the second four-way valve 160 is respectively communicated with an end of the second connection pipe 184, an end of the first heat exchanger 110 far from the first four-way valve 120, an end of the first pipe section 141, and an end of the second four-way valve 143, and the third four-way valve 170 is respectively communicated with an end of the first pipe section 141 far from the second four-way valve 160, The end of second tube segment 143 remote from second four-way valve 160, the end of second connection tube 184 remote from second four-way valve 160, and the end of first connection tube 182 remote from first four-way valve 120 are connected.

Under the condition that the first pipe section 141 is defrosted, the first four-way valve 120 conducts the outlet of the compressor 130 to communicate with the first heat exchanger 110, and the first connection pipe 182 to the outlet of the compressor 130; the second four-way valve 160 connects the first heat exchanger 110 with the first section 141, and the second connection pipe 184 with the second section 143; the third four-way valve 170 connects the first pipe section 141 and the second connection pipe 184, and the second pipe section 143 and the first connection pipe 182.

Under the condition that second pipe section 143 is defrosted, first four-way valve 120 connects the outlet of compressor 130 with first heat exchanger 110, first connecting pipe 182 and the outlet of compressor 130; the second four-way valve 160 connects the first heat exchanger 110 and the second section 143, and the second connection pipe 184 and the first section 141; third four-way valve 170 connects second pipe section 143 to second connection pipe 184, and first pipe section 141 to first connection pipe 182.

In this embodiment, the second heat exchanger 140 disposed outdoors includes a first pipe section 141 and a second pipe section 143 connected to each other, under the condition that the first pipe section 141 is defrosted, a high-temperature high-pressure heat exchange medium flowing out of an outlet of the compressor 130 enters the first heat exchanger 110 disposed indoors through the first four-way valve 120, forms a high-temperature high-pressure heat exchange medium after exchanging heat with indoor air, enters the first pipe section 141 through the second four-way valve 160, forms a low-temperature high-pressure heat exchange medium after defrosting and exchanging heat with the first pipe section 141, forms a low-temperature low-pressure heat exchange medium after throttling through the first expansion valve 150, forms a high-temperature low-pressure heat exchange medium after exchanging heat with the second pipe section 143, and finally flows back to the compressor 130. That is, under the condition that the first pipe section 141 is defrosted, the first pipe section 141 and the first heat exchanger 110 have the same working principle, and the air conditioner 100 can defrost the first pipe section 141 while heating indoor air, that is, the first pipe section 141 is defrosted by using the residual heat of the heat exchange medium, so that the indoor environment temperature is not reduced while defrosting, and the user experience is improved while defrosting.

Similarly, under the condition that the second pipe section 143 is defrosted, the high-temperature high-pressure heat exchange medium flowing out of the outlet of the compressor 130 enters the first heat exchanger 110 arranged indoors, forms a high-temperature high-pressure heat exchange medium after exchanging heat with indoor air, then enters the second pipe section 143, forms a low-temperature high-pressure heat exchange medium after defrosting and exchanging heat with the second pipe section 143, forms a low-temperature low-pressure heat exchange medium after throttling by the first expansion valve 150, forms a high-temperature low-pressure heat exchange medium after exchanging heat with the first pipe section 141, and finally flows back to the compressor 130. That is, under the condition that the second pipe section 143 is defrosted, the second pipe section 143 has the same working principle as the first heat exchanger 110, and the air conditioner 100 can defrost the second pipe section 143 while heating the indoor air, that is, the second pipe section 143 is defrosted by using the residual heat of the heat exchange medium, so that the indoor environment temperature is not reduced while defrosting, and the user experience is improved while defrosting.

That is, the air conditioner 100 can defrost the first duct section 141 while heating indoor air under the condition that the first duct section 141 is defrosted. Under the condition that the second duct section 143 is defrosted, the air conditioner 100 can defrost the second duct section 143 while heating indoor air. The defrosting of the second heat exchanger 140 can be achieved while the indoor temperature is ensured.

In this embodiment, the air conditioner 100 further includes a third connection pipe 186 and a second expansion valve 190, wherein one end of the first heat exchanger 110 remote from the first four-way valve 120 is connected to the second four-way valve 160 through the third connection pipe 186, and the second expansion valve 190 is disposed on the third connection pipe 186.

Under the conditions of defrosting of the first pipe section 141 and defrosting of the second pipe section 143, the second expansion valve 190 is opened to a maximum opening degree, and the first expansion valve 150 is opened to a first preset opening degree; wherein the first preset opening degree is less than half of the maximum opening degree of the first expansion valve 150.

Referring to fig. 3, the arrow direction in fig. 3 indicates the flowing direction of the heat exchange medium, and under the condition that the air conditioner 100 is in the heating mode, the first expansion valve 150 is opened to the maximum opening degree, and the second expansion valve 190 is opened to the second preset opening degree; wherein the second preset opening degree is smaller than half of the maximum opening degree of the second expansion valve 190.

In this embodiment, under the condition that the first pipe section 141 is defrosted, the first pipe section 141 is defrosted by the residual heat of the heat exchange medium, the second expansion valve 190 does not need to throttle the heat exchange medium, the opening degree of the second expansion valve 190 is opened to the maximum, the first pipe section 141 and the first heat exchanger 110 are communicated, both of which play a role in heating, and the first pipe section 141 is defrosted. The first expansion valve 150 performs a throttling function, and the heat exchange medium passing through the first pipe section 141 forms a low-temperature and low-pressure heat exchange medium after being throttled by the first expansion valve 150.

Similarly, under the condition that the second pipe section 143 is defrosted, the second pipe section 143 is defrosted by the residual heat of the heat exchange medium, and similarly, the second collision valve does not need to throttle the heat exchange medium, and the opening degree of the second collision valve is opened to the maximum, so that the second pipe section 143 is communicated with the first heat exchanger 110, and both the second pipe section 143 and the first heat exchanger 110 play a role in heating, and the second pipe section 143 is defrosted. The first expansion valve 150 performs a throttling function, and the heat exchange medium passing through the second pipe section 143 is throttled by the first expansion valve 150 to form a low-temperature and low-pressure heat exchange medium.

That is, if the second expansion valve 190 does not perform the throttling function under the condition that the first pipe section 141 and the second pipe section 143 are defrosted, the opening degree of the second expansion valve 190 is opened to the maximum, and if the first expansion valve 150 performs the throttling function, the opening degree of the first expansion valve 150 is opened to a small degree, and cannot exceed half of the maximum opening degree of the first expansion valve 150.

In this embodiment, when the air conditioner 100 is in the heating mode, the second four-way valve 160 respectively connects the first heat exchanger 110 to the first pipe section 141, and the first heat exchanger 110 to the second pipe section 143, and the third four-way valve 170 respectively connects the first pipe section 141 to the inlet of the compressor 130, and the second pipe section 143 to the inlet of the compressor 130.

In the heating mode, the first pipe section 141 and the second pipe section 143 are integrated. In the heating mode, the first four-way valve 120 connects the outlet of the compressor 130 and the inlets of the first heat exchanger 110, the first connection pipe 182 and the compressor 130, and the second expansion valve 190 connects the first heat exchanger 110 and the first pipe section 141 and the second pipe section 143. Third four-way valve 170 connects first connection pipe 182 with first pipe section 141 and second pipe section 143. Under the condition that the air conditioner 100 operates in the heating mode, the low-temperature high-pressure heat exchange medium flowing out of the first heat exchanger 110 is throttled by the second expansion valve 190 and then becomes a low-temperature low-pressure heat exchange medium, the low-temperature low-pressure heat exchange medium flows into the first pipe section 141 and the second pipe section 143 at the same time, the first pipe section 141 and the second pipe section 143 exchange heat with the low-temperature low-pressure heat exchange medium at the same time, the high-temperature low-pressure heat exchange medium is formed, and the high-temperature low-pressure heat exchange medium flows back to the inlet of the compressor 130 through the third four-way valve 170.

That is, in the heating mode, the first pipe section 141 and the second pipe section 143 heat the heat exchange medium at the same time, and in the heating mode, the first pipe section 141 and the second pipe section 143 are connected in parallel, and the working principle of the first pipe section 141 and the second pipe section 143 is the same. In the heating mode, when the second expansion valve 190 performs a throttling function and the first expansion valve 150 does not perform a throttling function, the opening degree of the first expansion valve 150 is maximized, and the opening degree of the second expansion valve 190 is minimized and cannot exceed half the maximum opening degree of the second expansion valve 190.

In this embodiment, second four-way valve 160 includes first port 162, second port 164, third port 166, and fourth port 168, wherein first port 162 is connected to third connection pipe 186, second port 164 is connected to second connection pipe 184, third port 166 is connected to first pipe segment 141, and fourth port 168 is connected to second pipe segment 143.

In the condition of defrosting of the first tube section 141, the first port 162 communicates with the third port 166, and the second port 164 communicates with the fourth port 168; under conditions where the second tube section 143 is defrosted, the first valve port 162 communicates with the fourth valve port 168; the second port 164 is in communication with the third port 166; when the air conditioner 100 is in the heating mode or the cooling mode, the first valve port 162 is communicated with the third valve port 166 and the fourth valve port 168.

In the present embodiment, in the condition that the first pipe section 141 is defrosted, the first port 162 is communicated with the third port 166, the second port 164 is communicated with the fourth port 168, so that the first pipe section 141 is communicated with the first heat exchanger 110, and the first pipe section 141 is communicated with the second pipe section 143. The low-temperature and high-pressure heat exchange medium flowing out of the first heat exchanger 110 enters the first pipe section 141, and the first pipe section 141 is defrosted by residual heat of the heat exchange medium.

Similarly, under the condition that the second pipe section 143 is defrosted, the first valve port 162 is communicated with the fourth valve port 168, so that the first pipe section 141 is communicated with the first heat exchanger 110, the low-temperature high-pressure heat exchange medium flowing out of the first heat exchanger 110 enters the second pipe section 143, and the first pipe section 141 is defrosted by the residual heat of the heat exchange medium.

In the heating mode or the cooling mode, the first valve port 162 is communicated with the third valve port 166 and the fourth valve port 168. In the heating mode, the low-temperature and high-pressure heat exchange medium flowing out of the first heat exchanger 110 is throttled by the second expansion valve 190 and then enters the first pipe section 141 and the second pipe section 143, respectively. In the cooling mode, the low-temperature and high-pressure heat exchange medium flowing out of the first pipe section 141 and the second pipe section 143 is throttled by the second expansion valve 190 and then enters the first heat exchanger 110 to cool the indoor environment.

In this embodiment, third four-way valve 170 includes first connection port 172, second connection port 174, third connection port 176, and fourth connection port 178, first connection port 172 is connected to second connection pipe 184, second connection port 174 is connected to first connection pipe 182, third connection port 176 is connected to first pipe section 141, and fourth connection port 178 is connected to second pipe section 143;

in the defrosting condition of the first pipe section 141, the first connection port 172 communicates with the third connection port 176, and the second connection port 174 communicates with the fourth connection port 178; in the condition where the second pipe section 143 is defrosted, the first connection port 172 communicates with the fourth connection port 178, and the second connection port 174 communicates with the third connection port 176; when the air conditioner 100 is in the heating mode or the cooling mode, the third connection port 176 communicates with the second connection port 174, and the fourth connection port 178 communicates with the second connection port 174.

In this embodiment, the first four-way valve 120 includes a first conduction port 122, a second conduction port 124, a third conduction port 126 and a fourth conduction port 128, the first conduction port 122 is communicated with an inlet of the compressor 130, the second conduction port 124 is communicated with an outlet of the compressor 130, the third conduction port 126 is communicated with the first heat exchanger 110, and the fourth conduction port 128 is communicated with the first connection pipe 182; in the defrosting condition of the first pipe section 141, the defrosting condition of the second pipe section 143, and the heating mode of the air conditioner 100, the first conduction port 122 communicates with the fourth conduction port 128, and the second conduction port 124 communicates with the third conduction port 126.

The working principle of the air conditioner 100 provided by the embodiment is as follows: referring to fig. 1, an arrow direction in fig. 1 indicates a flow direction of the heat exchange medium, in the present embodiment, under the condition that the first pipe section 141 is defrosted, the second conduction port 124 of the first four-way valve 120 is communicated with the third conduction port 126, the first conduction port 122 is communicated with the fourth conduction port 128, the first port 162 of the second four-way valve 160 is communicated with the third port 166, the second port 164 is communicated with the fourth port 168, the first connection port 172 of the third four-way valve 170 is communicated with the third connection port 176, the second connection port 174 is communicated with the fourth connection port 178, the opening degree of the first expansion valve 150 is a first preset opening degree, and the opening degree of the second expansion valve 190 is a maximum opening degree. The high-temperature high-pressure heat exchange medium flowing out of the compressor 130 flows into the first heat exchanger 110, and becomes a low-temperature high-pressure heat exchange medium after passing through the first heat exchanger 110, and the low-temperature high-pressure heat exchange medium enters the first pipe section 141, so that the first pipe section 141 is defrosted by the waste heat of the heat exchange medium. The low-temperature high-pressure heat exchange medium flowing out of the first pipe section 141 is throttled by the first expansion valve 150 and changed into a low-temperature low-pressure heat exchange medium, and the low-temperature high-pressure heat exchange medium is changed into a high-temperature low-pressure heat exchange medium after being subjected to heat exchange by the second pipe section 143 and returned to the compressor 130.

Referring to fig. 2, the arrow direction in fig. 2 indicates the flow direction of the heat exchange medium, and under the condition that the second pipe section 143 is defrosted, the second conduction port 124 of the first four-way valve 120 is communicated with the third conduction port 126, the first conduction port 122 is communicated with the fourth conduction port 128, the first port 162 of the second four-way valve 160 is communicated with the fourth port 168, the second port 164 is communicated with the third port 166, the first connection port 172 of the third four-way valve 170 is communicated with the fourth connection port 178, the second connection port 174 is communicated with the third connection port 176, the opening degree of the first expansion valve 150 is a first predetermined opening degree, and the opening degree of the second expansion valve 190 is a maximum opening degree. The high-temperature and high-pressure heat exchange medium flowing out of the compressor 130 flows into the first heat exchanger 110, and is changed into a low-temperature and high-pressure heat exchange medium after passing through the first heat exchanger 110, and the low-temperature and high-pressure heat exchange medium enters the second pipe section 143, so that the second pipe section 143 is defrosted by the waste heat of the heat exchange medium. The low-temperature and high-pressure heat exchange medium flowing out of the second pipe section 143 is throttled by the first expansion valve 150 and then changed into a low-temperature and low-pressure heat exchange medium, and the low-temperature and high-pressure heat exchange medium is changed into a high-temperature and low-pressure heat exchange medium after being subjected to heat exchange by the first pipe section 141 and then flows back to the compressor 130.

Referring to fig. 3, the direction of arrows in fig. 3 indicates the flow direction of the heat exchange medium, and in the heating mode, the second conduction port 124 of the first four-way valve 120 is in conduction with the third conduction port 126, the first conduction port 122 is in conduction with the fourth conduction port 128, the first port 162 of the second four-way valve 160 is in conduction with the third port 166 and the fourth port 168 at the same time, and the first connection port 172 of the third four-way valve 170 is in conduction with the third connection port 176 and the fourth connection port 178 at the same time. The opening degree of the first expansion valve 150 is the maximum opening degree, and the opening degree of the second expansion valve 190 is the second preset opening degree. The high-temperature high-pressure heat exchange medium flowing out of the compressor 130 flows into the first heat exchanger 110, becomes a low-temperature high-pressure heat exchange medium after passing through the first heat exchanger 110, becomes a low-temperature low-pressure heat exchange medium after being throttled by the second expansion valve 190, and the low-temperature low-pressure heat exchange medium enters the first pipe section 141 and the second pipe section 143 respectively, and forms a high-temperature low-pressure heat exchange medium after being subjected to heat exchange by the first pipe section 141 or the second pipe section 143, and then flows back to the compressor 130.

Referring to fig. 4, the arrows in fig. 4 indicate the flow direction of the heat exchange medium, and in the cooling mode, the second conduction port 124 of the first four-way valve 120 is in conduction with the fourth conduction port 128, the third conduction port 126 is in conduction with the first conduction port 122, the first port 162 of the second four-way valve 160 is in conduction with the third port 166 and the fourth port 168, and the first connection port 172 of the third four-way valve 170 is in conduction with the third connection port 176 and the fourth connection port 178. The opening degree of the first expansion valve 150 is the maximum opening degree, and the opening degree of the second expansion valve 190 is the second preset opening degree. The high-temperature and high-pressure heat exchange medium flowing out of the compressor 130 flows into the first pipe section 141 and the second pipe section 143, passes through the first pipe section 141 and the second pipe section 143, is changed into a low-temperature and high-pressure heat exchange medium, is throttled by the second expansion valve 190, is changed into a low-temperature and low-pressure heat exchange medium, enters the first heat exchanger 110, exchanges heat with the first heat exchanger 110 to form a high-temperature and low-pressure heat exchange medium, and flows back to the compressor 130.

In summary, in the air conditioner 100 provided in this embodiment, under the condition that the first pipe section 141 is defrosted, the high-temperature and high-pressure heat exchange medium flowing out of the outlet of the compressor 130 enters the first heat exchanger 110 disposed indoors through the first four-way valve 120, forms a high-temperature and high-pressure heat exchange medium after exchanging heat with the indoor air, enters the first pipe section 141 through the second four-way valve 160, forms a low-temperature and high-pressure heat exchange medium after defrosting and exchanging heat for the first pipe section 141, forms a low-temperature and low-pressure heat exchange medium after throttling through the first expansion valve 150, and forms a high-temperature and low-pressure heat exchange medium after exchanging heat through the second pipe section 143, and finally flows back to the compressor 130. That is to say, under the condition that the first pipe section 141 is defrosted, the first pipe section 141 and the first heat exchanger 110 have the same working principle, and the air conditioner 100 can defrost the first pipe section 141 while heating indoor air, that is, the first pipe section 141 is defrosted by using the residual heat of the heat exchange medium, so that the indoor environment temperature is not reduced while defrosting, and the user experience is improved while defrosting.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (6)

1. The air conditioner is characterized in that the air conditioner (100) comprises a first heat exchanger (110), a first four-way valve (120), a compressor (130), a second heat exchanger (140), a first expansion valve (150), a second four-way valve (160), a third four-way valve (170), a first connecting pipe (182) and a second connecting pipe (184), wherein the first heat exchanger (110) is arranged indoors, the second heat exchanger (140) is arranged outdoors, the second heat exchanger (140) comprises a first pipe section (141) and a second pipe section (143), the first expansion valve (150) is arranged on the second connecting pipe (184), the first four-way valve (120) is respectively communicated with an inlet and an outlet of the compressor (130), one end of the first connecting pipe (182) and the first heat exchanger (110), and the second four-way valve (160) is respectively communicated with one end, and the other end of the second connecting pipe (184), The end of the first heat exchanger (110) far away from the first four-way valve (120), the end of the first pipe section (141) and the end of the second pipe section (143) are communicated, and the third four-way valve (170) is respectively connected with the end of the first pipe section (141) far away from the second four-way valve (160), the end of the second pipe section (143) far away from the second four-way valve (160), the end of the second connecting pipe (184) far away from the second four-way valve (160) and the end of the first connecting pipe (182) far away from the first four-way valve (120);

the first four-way valve (120) conducts the outlet of the compressor (130) to the first heat exchanger (110), the first connecting pipe (182) and the outlet of the compressor (130) under the condition that the first pipe section (141) is defrosted; the second four-way valve (160) connects the first heat exchanger (110) with the first pipe section (141) and the second connecting pipe (184) with the second pipe section (143); the third four-way valve (170) connects the first pipe section (141) and the second connection pipe (184), and the second pipe section (143) and the first connection pipe (182);

the first four-way valve (120) conducts the outlet of the compressor (130) with the first heat exchanger (110), the first connecting pipe (182) with the outlet of the compressor (130) under the condition that the second pipe section (143) is defrosted; the second four-way valve (160) conducts the first heat exchanger (110) and the second pipe section (143), and the second connecting pipe (184) and the first pipe section (141); the third four-way valve (170) connects the second pipe section (143) and the second connection pipe (184), and the first pipe section (141) and the first connection pipe (182).

2. The air conditioner according to claim 1, wherein the air conditioner (100) further comprises a third connection pipe (186) and a second expansion valve (190), wherein an end of the first heat exchanger (110) remote from the first four-way valve (120) is connected to the second four-way valve (160) through the third connection pipe (186), and the second expansion valve (190) is disposed on the third connection pipe (186);

under the conditions that the first pipe section (141) is defrosted and the second pipe section (143) is defrosted, the second expansion valve (190) is opened to a maximum opening degree, and the first expansion valve (150) is opened to a first preset opening degree; wherein the first preset opening degree is less than half of a maximum opening degree of the first expansion valve (150);

under the condition that the air conditioner (100) is in a heating mode or a cooling mode, the first expansion valve (150) is opened to the maximum opening degree, and the second expansion valve (190) is opened to a second preset opening degree; wherein the second preset opening degree is less than half of the maximum opening degree of the second expansion valve (190).

3. The air conditioner according to claim 2, wherein the second four-way valve (160) comprises a first valve port (162), a second valve port (164), a third valve port (166) and a fourth valve port (168), the first valve port (162) is connected with the third connecting pipe (186), the second valve port (164) is connected with the second connecting pipe (184), the third valve port (166) is connected with the first pipe section (141), and the fourth valve port (168) is connected with the second pipe section (143);

under a condition that the first pipe section (141) is defrosted, the first valve port (162) is communicated with the third valve port (166), and the second valve port (164) is communicated with the fourth valve port (168);

the first valve port (162) communicates with the fourth valve port (168) in a condition where the second tube section (143) is defrosted; the second valve port (164) is in communication with the third valve port (166);

the first valve port (162) is communicated with the third valve port (166) and the fourth valve port (168) under the condition that the air conditioner (100) is in a heating mode or a cooling mode.

4. The air conditioner of claim 1, wherein the third four-way valve (170) comprises a first connection port (172), a second connection port (174), a third connection port (176), and a fourth connection port (178), the first connection port (172) is connected to the second connection pipe (184), the second connection port (174) is connected to the first connection pipe (182), the third connection port (176) is connected to the first pipe section (141), and the fourth connection port (178) is connected to the second pipe section (143);

-the first connection port (172) communicates with the third connection port (176) and the second connection port (174) communicates with the fourth connection port (178) in a condition in which the first pipe section (141) is defrosted; -in the condition of defrosting of the second pipe section (143), the first connection port (172) communicates with the fourth connection port (178), the second connection port (174) communicates with the third connection port (176); the third connection port (176) communicates with the second connection port (174), and the fourth connection port (178) communicates with the second connection port (174) when the air conditioner (100) is in a heating mode or a cooling mode.

5. The air conditioner according to claim 1, wherein the first four-way valve (120) includes a first conduction port (122), a second conduction port (124), a third conduction port (126), and a fourth conduction port (128), the first conduction port (122) communicates with an inlet of the compressor (130), the second conduction port (124) communicates with an outlet of the compressor (130), the third conduction port (126) communicates with the first heat exchanger (110), and the fourth conduction port (128) communicates with a first connection pipe (182); the first conduction port (122) is communicated with the fourth conduction port (128), and the second conduction port (124) is communicated with the third conduction port (126) under the conditions that the first pipe section (141) is defrosted, the second pipe section (143) is defrosted and the air conditioner (100) is in a heating mode.

6. The air conditioner according to claim 1, wherein under a condition that the air conditioner (100) is in a heating mode, the second four-way valve (160) respectively conducts the first heat exchanger (110) and the first pipe section (141), and the first heat exchanger (110) and the second pipe section (143), and the third four-way valve (170) respectively conducts the first pipe section (141) and an inlet of the compressor (130), and the second pipe section (143) and an inlet of the compressor (130).

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