CN211060240U - Outer quick-witted defrosting system and air conditioner that do not shut down - Google Patents

Abstract

The utility model provides a non-stop defrosting system for an external unit and an air conditioner, which relate to the technical field of air conditioners. The utility model includes a first external unit heat exchanger, a second external unit heat exchanger, a first four-way reversing valve, a first The throttle assembly, the second throttle assembly and the seventh cut-off valve; the first external heat exchanger, the first throttle assembly, the second external heat exchanger, the seventh cut-off valve and the second throttle assembly are sequentially connected in series ; The S1 end of the first four-way reversing valve is connected to the compression system, the C1 end of the first four-way reversing valve is connected to the first external machine heat exchanger, and the E1 end of the first four-way reversing valve is connected to the second external machine. Between the heat exchanger and the seventh shut-off valve, the D1 end of the first four-way reversing valve is connected between the seventh shut-off valve and the second throttle assembly. In the non-stop defrosting system for the external machine and the air conditioner according to the utility model, two external machine heat exchangers arranged in series can be defrosted alternately. When one of the external machine heat exchangers needs to be defrosted, the other one The machine heat exchanger can carry out heat exchange to ensure that the heating does not stop.

Description

A non-stop defrosting system and air conditioner for an external machine

technical field

The utility model relates to the technical field of air conditioners, in particular to a defrosting system and an air conditioner without stopping the external machine.

Background technique

In areas without central heating in winter, air conditioners (especially multi-line) become the main heating device. However, when the air conditioner is running in the heating mode, due to the low ambient temperature, the surface of the heat exchanger of the outdoor unit is prone to frost, which seriously affects the heat exchange effect.

At present, there are two types of defrosting methods for air conditioners: thermal defrosting and non-thermal defrosting. Non-thermal defrosting mainly uses external force to defrost, including ultrasonic defrosting. The initial defrosting effect of non-thermal defrosting is obvious, but the continuous defrosting effect is poor. Thermal defrosting mainly includes reverse cycle defrosting and hot gas bypass defrosting. These two defrosting effects are obvious, and they are also the most commonly used defrosting methods at present. The energy consumption of the machine increases.

Utility model content

The problem solved by the utility model is that the defrosting effect of the existing non-thermal defrosting method is not high, and the thermal defrosting needs to be shut down, resulting in insufficient indoor heating and increased energy consumption of the compressor during defrosting.

In order to solve the above problems, the utility model provides a non-stop defrosting system for an external machine, which includes a first external machine heat exchanger, a second external machine heat exchanger, a first four-way reversing valve, a first throttle assembly, The second throttle assembly and the seventh shut-off valve;

The first external machine heat exchanger, the first throttle assembly, the second external machine heat exchanger, and the seventh shut-off valve are sequentially connected in series with the second throttle assembly;

The S1 end of the first four-way reversing valve is connected to the compression system, the C1 end of the first four-way reversing valve is connected to the first external heat exchanger, and the E1 end of the first four-way reversing valve is connected The D1 end of the first four-way reversing valve is connected between the seventh stop valve and the second throttle assembly between.

By arranging two external machine heat exchangers connected in series, the utility model enables the two external machine heat exchangers arranged in series to defrost alternately, and when one of the external machine heat exchangers needs to be defrosted, the other external machine heat exchanger The heat exchanger can perform heat exchange to ensure that the heating does not stop and the indoor heat is continuously supplied; and the two external heat exchangers can perform heat exchange at the same time to improve the heat exchange efficiency.

Optionally, an internal heat exchanger is also included, and the gas pipe and the liquid pipe of the internal heat exchanger are respectively connected to the compression system and the second throttle assembly, so as to ensure the control of the indoor environment.

Optionally, the compression system includes a compressor, and the compressor is connected to the first external heat exchanger and the internal heat exchanger respectively, and the refrigerant is compressed into a high temperature and high pressure refrigerant by the compressor, and is supplied to the heat exchanger. Internal heat exchanger for heating.

Optionally, the compression system further includes a second four-way reversing valve, the C2 end of the second four-way reversing valve is connected to the S1 end of the first four-way reversing valve, and the second four-way reversing valve is connected to the S1 end of the first four-way reversing valve. The D2 end of the reversing valve is connected to the air pipe of the compressor, the E2 end of the second four-way reversing valve is connected to the internal heat exchanger, and the S2 end of the second four-way reversing valve is connected to the The liquid pipe of the compressor can provide high-temperature and high-pressure refrigerant, and the system can realize cooling and heating functions through the reversal of the second four-way reversing valve.

Optionally, it also includes a first shut-off valve, a third shut-off valve and a sixth shut-off valve;

The first shut-off valve is arranged between the C2 end of the second four-way reversing valve and the S1 end of the first four-way reversing valve, and the third shut-off valve is arranged on the first external machine Between the heat exchanger and the C1 end, one end of the sixth cut-off valve is connected between the second external heat exchanger and the seventh cut-off valve, and the other end of the sixth cut-off valve is connected to the The E1 end of the first four-way reversing valve, through the control of the valve and the pipeline, realizes the direction of the refrigerant in the system, and realizes the operation of various modes of cooling, heating and defrosting modes. Through the control of multiple stop valves, The defrosting of the first external machine heat exchanger and the second external machine heat exchanger can be realized respectively, and the machine does not stop during the defrosting process.

Optionally, the first throttle assembly includes a first throttle member and a fifth cut-off valve connected in series, and a parallel connection with both ends of the first throttle member and the fifth cut-off valve connected in series. the fourth stop valve;

The second throttle assembly includes a second throttle member and a ninth cut-off valve connected in series, and an eighth cut-off valve connected in parallel with both ends of the second throttle member and the ninth cut-off valve connected in series . According to actual needs, throttling can be performed when throttling is required, and when throttling is not required, the throttling component can also be used as a communication pipe to allow the refrigerant to flow through without throttling.

Optionally, the first throttling member and the second throttling member are electronic expansion valves, capillary tubes or thermal expansion valves, so as to realize the throttling function, which is simple and easy to implement.

The utility model also provides an air conditioner, which includes the non-stop defrosting system for the external machine described in any one of the above.

The beneficial effects of the air conditioner relative to the prior art are the same as the beneficial effects of the non-stop defrosting system for the external unit relative to the prior art, which will not be repeated here.

Optionally, the air conditioner further includes a second shut-off valve, one end of the second shut-off valve is connected between the second four-way reversing valve and the first shut-off valve, and the other end of the second shut-off valve is connected The first external heat exchanger.

When the air conditioner operates in the heating mode or the cooling mode, the circulation of the refrigerant may not be realized through the first four-way reversing valve, the refrigerant path is shorter, and the system operation is simpler.

Description of drawings

1 is a schematic diagram of a defrosting system according to an embodiment of the present utility model;

2 is a schematic diagram of the refrigerant flow when the defrosting system according to the embodiment of the present utility model defrosts the first external machine heat exchanger;

3 is a schematic diagram of the refrigerant flow when the defrosting system according to the embodiment of the present utility model defrosts the second external machine heat exchanger;

4 is a schematic diagram of the connection of the second shut-off valve according to the embodiment of the present utility model;

5 is a schematic diagram of the flow direction of the refrigerant in the heating mode of the air conditioner according to the embodiment of the present utility model;

6 is a schematic diagram of the flow direction of the refrigerant in the refrigeration mode of the air conditioner according to the embodiment of the present invention.

Description of reference numbers:

1- The first external machine heat exchanger, 2- The second external machine heat exchanger, 3- The first four-way reversing valve, 4- The second four-way reversing valve, 5- Compressor, 6- Inner machine changer Heater, 7-first throttle, 8-second throttle, 9-first shut-off valve, 10-second shut-off valve, 11-third shut-off valve, 12-fourth shut-off valve, 13-first shut-off valve Five stop valve, 14- sixth stop valve, 15- seventh stop valve, 16- eighth stop valve, 17- ninth stop valve.

Detailed ways

Existing air conditioners often use thermal defrosting when the external heat exchanger is frosted or prone to frost, and the most common is the reverse cycle defrosting method. The reverse cycle defrosting method refers to: when the air conditioner heating mode needs to defrost the external heat exchanger, the four-way reversing valve is reversed, so that the high temperature and high pressure refrigerant compressed by the compressor first flows into the external heat exchanger to defrost , and then enter the throttling device and the internal heat exchanger and other components. The main problem brought about by this process is that the internal heat exchanger no longer provides heat, which makes the indoor heating insufficient and cannot satisfy the user's temperature comfort, especially for multi-connection.

Aiming at the defrosting problem of the outdoor unit, the utility model provides a non-stop defrosting system for the outdoor unit, a control method and an air conditioner, so that the defrosting process of the air conditioner does not stop and ensures continuous indoor heating.

In order to make the above objects, features and advantages of the present utility model more clearly understood, the specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that terms such as "first" and "second" in various embodiments are only used for description purposes, and should not be construed as indicating or implying relative importance or implicit Indicates the number of technical features indicated. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature.

This embodiment provides a non-stop defrosting system for an external unit, which, compared to an existing air conditioner (especially a multi-connection), includes at least two first and second external unit heat exchangers connected in series. The models of the first external heat exchanger and the second external heat exchanger may be the same or different. When the air conditioner is running in the cooling and heating modes, the first external heat exchanger 1 and the second external heat exchanger both conduct heat exchange, and heat exchange can be performed between the two external heat exchangers, and also The heat exchange between the two external heat exchangers can be carried out at the same time to improve the heat exchange efficiency of the external heat exchangers.

And when any one of the first outdoor heat exchanger and the second outdoor heat exchanger is frosted, the frosted outdoor heat exchanger will be defrosted, and the unfrosted outdoor heat exchanger will be defrosted. heat exchange. Preferably, any one or a combination of various defrosting methods such as thermal defrosting and non-thermal defrosting can be adopted for the frosted external heat exchanger.

By arranging two external heat exchangers connected in series, the two external heat exchangers arranged in series can work alternately, and when one of the external heat exchangers needs to be defrosted, the other one can Heat exchange ensures that the heating does not stop and the indoor heat is continuously supplied; and the two external heat exchangers can perform heat exchange at the same time to improve the heat exchange efficiency.

In addition, the defrosting external heat exchanger is equivalent to a subcooler, which can use the cooling capacity of the frost layer to improve the subcooling degree of the refrigerant, improve the system efficiency, make up for the reduction in the heating capacity during defrosting, and achieve continuous heating effect.

On the basis of the above embodiment, in order to make the cooling and heating functions operate normally, the non-stop defrosting system for the external machine in this embodiment further includes a throttling device. When running in heating mode, the throttling device throttles the refrigerant discharged from the internal heat exchanger; when running in cooling mode, the throttling device throttles the refrigerant entering the internal heat exchanger.

And when any one of the first external heat exchanger and the second external heat exchanger is frosted, the throttling device throttles the refrigerant discharged from the defrosted external heat exchanger, The throttled refrigerant is suitable for entering the unfrosted external heat exchanger.

Specifically, a single throttling device can be controlled in various ways such as a four-way valve to achieve the above-mentioned throttling effect on the refrigerant. This embodiment provides a simpler implementation. Specifically, with reference to FIG. 1 , it includes :

The throttling device includes a first throttling component and a second throttling component, the first throttling component is connected in series between the first external machine heat exchanger 1 and the second external machine heat exchanger 2, and the second throttling component is connected in series. between the second outer machine heat exchanger 2 and the inner machine heat exchanger.

When the air conditioner operates normally in the heating mode, the refrigerant discharged from the compressor enters the internal heat exchanger for heat exchange, and then passes through the second throttling component for throttling, and then enters the first external heat exchanger connected in series 1 exchanges heat with the second external heat exchanger 2. At this time, the first throttling component does not throttle, and the refrigerant returns to the compressor.

When the air conditioner operates normally in the cooling mode, the refrigerant discharged from the compressor first enters the series-connected first external heat exchanger 1 and the second external heat exchanger 2 for heat exchange. At this time, the first throttling component does not perform heat exchange. After throttling, the refrigerant enters the second throttling component for throttling, and then enters the internal heat exchanger for heat exchange and returns to the compressor.

When the air conditioner defrosts the first external heat exchanger 1, the refrigerant discharged from the compressor enters the internal heat exchanger for heat exchange, and then enters the first external heat exchanger 1 for defrosting, and then passes through the first external heat exchanger 1 for defrosting. The throttling component is throttled, and then flows into the second external heat exchanger 2 for heat exchange, and then returns to the compressor.

When the air conditioner defrosts the second external heat exchanger 2, the refrigerant discharged from the compressor enters the internal heat exchanger for heat exchange, then enters the second external heat exchanger 2 for defrosting, and then passes through the first The throttling component is throttled, and then flows into the first external heat exchanger 1 for heat exchange, and then returns to the compressor.

Specifically, as shown in FIGS. 1 to 6 , the defrosting system includes a first external heat exchanger 1 , a first throttle assembly, a second external heat exchanger 2 , and a seventh shut-off valve 15 connected in series With the second throttle assembly, the S1 end of the first four-way reversing valve 3 is connected to the compression system, the C1 end of the first four-way reversing valve 3 is connected to the first external heat exchanger 1, and the first four-way reversing valve is connected. The E1 end of 3 is connected between the second external heat exchanger 2 and the seventh shut-off valve 15, and the D1 end of the first four-way reversing valve 3 is connected between the seventh shut-off valve 15 and the second throttle assembly.

The compression system is used to provide high temperature and high pressure refrigerant, including the compressor 5 and the second four-way reversing valve 4. The C2 end of the second four-way reversing valve 4 is connected to the S1 end of the first four-way reversing valve 3, and the second four-way reversing valve 3. The D2 end of the reversing valve 4 is connected to the air pipe of the compressor 5, the E2 end of the second four-way reversing valve 4 is connected to the internal heat exchanger 6, and the S2 end of the second four-way reversing valve 4 is connected to the compressor 5. liquid pipe. Specifically, in an air conditioner that only needs heating but not cooling, the second four-way reversing valve 4 is not required, and the reversing of the second four-way reversing valve 4 realizes the switching between the compressor cooling mode and the heating mode.

Specifically, through the design of the valve and the pipeline, the above-mentioned selection can be realized in various ways, and the first throttling component and the second throttling component are used to throttle the refrigerant. This embodiment provides an implementation manner with a simple structure. As shown in FIG. 1 to FIG. 6 , the first throttle assembly includes a first throttle member 7 and a fifth shut-off valve 13 connected in series, and a first throttle member 7 connected in series with a first stop valve 13 connected in series. The throttle member 7 is connected to the fourth stop valve 12 in parallel with both ends of the fifth stop valve 13 . When the first throttling member 7 is required for throttling, the fifth shut-off valve 13 is connected and the fourth shut-off valve 12 is disconnected; when the first throttling member 7 is not required for throttling, the fourth shut-off valve 12 is communicated and shut off Open the fifth stop valve 13 .

As shown in FIG. 2 , the second throttle assembly includes a second throttle member 8 and a ninth stop valve 17 connected in series, and a parallel connection with both ends of the second throttle member 8 and the ninth stop valve 17 connected in series. The eighth stop valve 16 . When the second throttling member 8 is required for throttling, the ninth shut-off valve 17 is connected and the eighth shut-off valve 16 is disconnected; when the second throttling member 8 is not required for throttling, the eighth shut-off valve 16 is communicated and shut off Open the ninth stop valve 17.

On the basis of the above-mentioned embodiment, this embodiment provides a specific implementation manner of connecting the above-mentioned first external machine heat exchanger 1 , the first throttle assembly, the second external machine heat exchanger 2 and the second throttle assembly, With reference to Fig. 3, a non-stop defrosting system for an external machine is provided, including a first external machine heat exchanger 1, a second external machine heat exchanger 2, an internal machine heat exchanger 6 and a second and fourth heat exchangers connected in series. The first four-way reversing valve 4 and the second four-way reversing valve 4 are connected with the first external heat exchanger 1 to form a closed circuit, and also include the first four-way reversing valve 3, the second four-way reversing valve 4, the first four-way reversing valve 4, the first four-way reversing valve A shut-off valve 9 , a third shut-off valve 11 , a sixth shut-off valve 14 and a seventh shut-off valve 15 .

A first throttling component is arranged between the first external machine heat exchanger 1 and the second external machine heat exchanger 2, and the first throttling component includes a first throttling member 7 and a fifth shut-off valve 13 connected in series, and A fourth shut-off valve 12 connected in parallel with both ends of the first throttle member 7 and the fifth shut-off valve 13 connected in series.

A second throttle assembly is arranged between the second outer machine heat exchanger 2 and the inner machine heat exchanger 6, and the second throttle assembly includes a second throttle member 8 and a ninth shut-off valve 17 connected in series, and a series connection with The connected second throttling member 8 is connected to the eighth stop valve 16 connected in parallel with both ends of the ninth stop valve 17 .

One end of the first cut-off valve 9 is connected to the C2 end of the second four-way reversing valve 4 , and the other end of the first cut-off valve 9 is connected to the S1 end of the first four-way reversing valve 3 .

Both ends of the third shut-off valve 11 are respectively connected to the first external heat exchanger 1 and the C1 end of the first four-way reversing valve 3 .

The seventh shut-off valve 15 is connected between the second external heat exchanger 2 and the second throttle assembly.

One end of the sixth shut-off valve 14 is connected between the second external heat exchanger 2 and the seventh shut-off valve 15 , and the other end of the sixth shut-off valve 14 is connected to the E1 end of the first four-way reversing valve 3 .

The E2 end of the second four-way reversing valve 4 is connected to the intake pipe of the internal heat exchanger 6 .

The D1 end of the first four-way reversing valve 3 is connected between the seventh shut-off valve 15 and the second throttle assembly.

Specifically, the defrosting system described in this embodiment further includes a compressor 5 , and the liquid pipe and the gas pipe of the compressor 5 are respectively connected to the S2 end and the D2 end of the second four-way reversing valve 4 .

Preferably, the first throttle member 7 and the second throttle member 8 in this embodiment are electronic expansion valves, capillary tubes or thermal expansion valves.

Based on the non-stop defrosting system for the external machine provided by the above embodiment, the present embodiment also provides a non-stop defrosting control method for the external machine, including:

As shown in FIG. 2, when the defrosting signal of the first external heat exchanger 1 is received, the first four-way reversing valve 3 is controlled to communicate with the D1 end and the C1 end, and the second four-way reversing valve 4 is communicated with the D2 end and the C1 end. At the E2 end, control the first cut-off valve 9, the third cut-off valve 11, the fifth cut-off valve 13, the sixth cut-off valve 14 and the eighth cut-off valve 16, and close the fourth cut-off valve 12, the seventh cut-off valve 15 and the ninth cut-off valve 16. Stop valve 17; the high temperature and high pressure refrigerant compressed by the compressor 5 first enters the second four-way reversing valve 4 through the D2 end, and then enters the internal heat exchanger 6 through the E2 end for heat exchange, providing heat to the indoor environment, and then passing through the first The eight cut-off valve 16 enters the D1 end of the first four-way reversing valve 3, and then flows from the C1 end of the first four-way reversing valve 3 through the third cut-off valve 11 into the first external heat exchanger 1. At this time, the The temperature of the refrigerant is also relatively high, which can better increase the temperature of the first external heat exchanger 1 and defrost the first external heat exchanger 1; after flowing through the first external heat exchanger 1, It enters the first throttling member 7 for throttling, and becomes a low-temperature and low-pressure refrigerant, then enters the second external heat exchanger 2 for heat exchange, and then flows through the sixth shut-off valve 14 and enters the E1 of the first four-way reversing valve 3 end, and then flows out from the S1 end of the first four-way reversing valve 3, flows through the first stop valve 9 and returns to the C2 end of the second four-way reversing valve 4, and then passes through the S2 end of the second four-way reversing valve 4. Return to the compressor 5 to realize the circulation of the refrigerant.

As shown in FIG. 3, when receiving the defrosting signal of the second external heat exchanger 2, the first four-way reversing valve 3 is controlled to communicate with the D1 end and the E1 end, and the second four-way reversing valve 4 is communicated with the D2 end and the E1 end. At the E2 end, control the first cut-off valve 9, the third cut-off valve 11, the fifth cut-off valve 13, the sixth cut-off valve 14 and the eighth cut-off valve 16, and close the fourth cut-off valve 12, the seventh cut-off valve 15 and the ninth cut-off valve 16. Stop valve 17; the high temperature and high pressure refrigerant compressed by the compressor 5 first enters the second four-way reversing valve 4 through the D2 end, and then enters the internal heat exchanger 6 through the E2 end for heat exchange, providing heat to the indoor environment, and then passing through the first The eight cut-off valve 16 enters the D1 end of the first four-way reversing valve 3, and then flows from the E1 end of the first four-way reversing valve 3 through the sixth cut-off valve 14 into the second external heat exchanger 2. At this time, the The temperature of the refrigerant is also relatively high, which can better increase the temperature of the second external heat exchanger 2 and defrost the second external heat exchanger 2; after flowing through the second external heat exchanger 2, It enters the first throttling member 7 for throttling, becomes a low-temperature and low-pressure refrigerant, then enters the first external heat exchanger 1 for heat exchange, and then flows through the third shut-off valve 11 and enters the C1 of the first four-way reversing valve 3 end, and then flows out from the S1 end of the first four-way reversing valve 3, flows through the first stop valve 9 and returns to the C2 end of the second four-way reversing valve 4, and then passes through the S2 end of the second four-way reversing valve 4. Return to the compressor 5 to realize the circulation of the refrigerant.

In the defrosting system described in this embodiment, two external heat exchangers perform heat exchange at the same time under the condition of heat supply. When the defrosting condition is triggered, one outdoor heat exchanger will be defrosted first, and the other outdoor heat exchanger will continue to evaporate and absorb heat. When the defrosting is completed, the other outdoor heat exchanger can be defrosted by changing the flow direction of the first four-way reversing valve 3 immediately, or the other outdoor heat exchanger can be defrosted after waiting for a certain period of time. The defrosting method ensures that the defrosting of the two external heat exchangers can be performed alternately, the heat exchange process of the external heat exchanger is uninterrupted, and the heat supply of the internal heat exchanger is uninterrupted. During the whole defrosting process, while ensuring non-stop defrosting, the problem of reducing the service life caused by the long-term use of a single external heat exchanger is well solved, and the service life of the heat exchanger is improved at the same time.

On the basis of the above-mentioned non-stop defrosting control system for the external unit, this embodiment further provides an air conditioner, including the non-stop defrosting system for the external unit described in any of the above embodiments.

Specifically, the air conditioner includes various types of air conditioners, such as a wall-mounted unit, a cabinet unit, a multi-line unit, and an air duct unit, and can satisfy continuous heat supply and uninterrupted heat supply during defrosting.

Preferably, as shown in FIG. 4 , the air conditioner further includes a second shut-off valve 10 , and one end of the second shut-off valve 10 is connected between the second four-way reversing valve 4 and the first shut-off valve 9 . During this time, the other end of the second shut-off valve 10 is connected to the first external heat exchanger 1 .

When the air conditioner operates in the heating mode or the cooling mode, the circulation of the refrigerant may not be realized through the first four-way reversing valve 3. For details, please refer to the control process of the heating and cooling modes of the air conditioner and the flow direction of the refrigerant.

When the air conditioner operates in the heating mode, the first four-way reversing valve 3 can be connected to the D1 end and the C1 end, can be connected to the D1 end and the E1 end, or can be disconnected.

When the first four-way reversing valve 3 communicates with the D1 end and the C1 end, the second four-way reversing valve 4 communicates with the D2 end and the E2 end, and communicates with the first shut-off valve 9 , the third shut-off valve 11 and the fourth shut-off valve 12 , the sixth stop valve 14 and the ninth stop valve 17, close the second stop valve 10, the fifth stop valve 13, the seventh stop valve 15 and the eighth stop valve 16; the high temperature and high pressure refrigerant compressed by the compressor 5 first passes through the D2 end Enter the second four-way reversing valve 4, then enter the internal heat exchanger 6 through the E2 end for heat exchange, provide heat to the indoor environment, and then enter the second throttling member 8 through the ninth stop valve 17 for throttling, and then Enter the D1 end of the first four-way reversing valve 3, and then flow from the C1 end of the first four-way reversing valve 3 through the third stop valve 11 into the first external heat exchanger 1 for heat exchange, and then flow through the first external heat exchanger 1. The four shut-off valve 12 enters the second external heat exchanger 2 for heat exchange, and then flows through the sixth shut-off valve 14 into the E1 end of the first four-way reversing valve 3 , and then flows from the S1 of the first four-way reversing valve 3 The end flows out, flows through the first cut-off valve 9 and returns to the C2 end of the second four-way reversing valve 4, and then returns to the compressor 5 through the S2 end of the second four-way reversing valve 4 to realize the circulation of the refrigerant.

When the first four-way reversing valve 3 communicates with the D1 end and the E1 end, the second four-way reversing valve 4 communicates with the D2 end and the E2 end, and communicates with the first shut-off valve 9 , the third shut-off valve 11 and the fourth shut-off valve 12 , the sixth stop valve 14 and the ninth stop valve 17, close the second stop valve 10, the fifth stop valve 13, the seventh stop valve 15 and the eighth stop valve 16; the high temperature and high pressure refrigerant compressed by the compressor 5 first passes through the D2 end Enter the second four-way reversing valve 4, then enter the internal heat exchanger 6 through the E2 end for heat exchange, provide heat to the indoor environment, and then enter the second throttling member 8 through the ninth stop valve 17 for throttling, and then Enter the D1 end of the first four-way reversing valve 3, and then flow from the E1 end of the first four-way reversing valve 3 through the sixth stop valve 14 into the second external heat exchanger 2 for heat exchange, and then flow through the first The four-stop valve 12 enters the first external heat exchanger 1 for heat exchange, and then flows through the third shut-off valve 11 into the C1 end of the first four-way reversing valve 3 , and then flows from the S1 of the first four-way reversing valve 3 The end flows out, flows through the first cut-off valve 9 and returns to the C2 end of the second four-way reversing valve 4, and then returns to the compressor 5 through the S2 end of the second four-way reversing valve 4 to realize the circulation of the refrigerant.

As shown in FIG. 5 , when the first four-way reversing valve 3 is disconnected, the second four-way reversing valve 4 communicates with the D2 end and the E2 end, and communicates with the second shut-off valve 10 , the fourth shut-off valve 12 , and the seventh The shut-off valve 15 and the ninth shut-off valve 17 close the first shut-off valve 9, the third shut-off valve 11, the fifth shut-off valve 13, the sixth shut-off valve 14 and the eighth shut-off valve 16; Enter the second four-way reversing valve 4 through the D2 end, and then enter the internal heat exchanger 6 through the E2 end for heat exchange, provide heat to the indoor environment, and then enter the second throttle member 8 through the ninth stop valve 17 for throttling. It flows through the seventh cut-off valve 15 into the second external heat exchanger 2 for heat exchange, and then flows through the fourth cut-off valve 12 into the first external heat exchanger 1 for heat exchange, and then flows through the second cut-off The valve 10 returns to the C2 end of the second four-way reversing valve 4, and then returns to the compressor 5 through the S2 end of the second four-way reversing valve 4 to realize the circulation of the refrigerant.

When the air conditioner is operating in the cooling mode, the first four-way reversing valve 3 is disconnected. As shown in FIG. 6 , the second four-way reversing valve 4 communicates with the D2 end and the C2 end, communicates with the second stop valve 10 , the fourth stop valve 12 , the seventh stop valve 15 and the ninth stop valve 17 , and closes the first stop valve Valve 9, the third stop valve 11, the fifth stop valve 13, the sixth stop valve 14 and the eighth stop valve 16, the high temperature and high pressure refrigerant compressed by the compressor 5 first enters the second four-way reversing valve 4 through the D2 end, and then The C2 end flows through the second cut-off valve 10 into the first external heat exchanger 1 for heat exchange, and then flows through the fourth cut-off valve 12 into the second external heat exchanger 2 for heat exchange, and then flows through the seventh cut-off The valve 15 enters the second throttling member 8 for throttling, and then flows through the ninth cut-off valve 17 into the internal heat exchanger 6 for heat exchange, and then enters the E2 end of the second four-way reversing valve 4, and then passes through the second The S2 end of the four-way reversing valve 4 returns to the compressor 5 to realize the circulation of the refrigerant.

Preferably, the air conditioner further includes a fan, and the number of the fans is the same as the number of the heat exchangers (the sum of the numbers of the external heat exchanger and the internal heat exchanger). During defrosting, the fan can speed up the heat exchange between the heat exchanger and the external environment, and can increase the speed of the fan during defrosting, speed up the defrosting process, and shorten the defrosting time.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (10)

1. The defrosting system without stopping the outdoor unit is characterized by comprising a first outdoor unit heat exchanger (1), a second outdoor unit heat exchanger (2), a first four-way reversing valve (3), a first throttling assembly, a second throttling assembly and a seventh stop valve (15);

the first external machine heat exchanger (1), the first throttling assembly, the second external machine heat exchanger (2), a seventh stop valve (15) and the second throttling assembly are sequentially connected in series;

the S1 end of the first four-way reversing valve (3) is connected with a compression system, the C1 end of the first four-way reversing valve (3) is connected with the first outer machine heat exchanger (1), the E1 end of the first four-way reversing valve (3) is connected between the second outer machine heat exchanger (2) and the seventh stop valve (15), and the D1 end of the first four-way reversing valve (3) is connected between the seventh stop valve (15) and the second throttling assembly.

2. The outdoor unit non-stop defrosting system of claim 1 further comprising an indoor unit heat exchanger (6), wherein the air pipe and the liquid pipe of the indoor unit heat exchanger (6) are respectively connected with the compression system and the second throttling assembly.

3. The outdoor unit non-stop defrost system according to claim 2, characterized in that the compression system comprises a compressor (5), and the compressor (5) is connected to the first outdoor unit heat exchanger (1) and the indoor unit heat exchanger (6), respectively.

4. The outdoor unit non-stop defrosting system according to claim 3, wherein the compression system further comprises a second four-way reversing valve (4), the C2 end of the second four-way reversing valve (4) is connected with the S1 end of the first four-way reversing valve (3), the D2 end of the second four-way reversing valve (4) is connected with the air pipe of the compressor (5), the E2 end of the second four-way reversing valve (4) is connected with the indoor unit heat exchanger (6), and the S2 end of the second four-way reversing valve (4) is connected with the liquid pipe of the compressor (5).

5. The outdoor unit non-stop defrosting system according to claim 4, further comprising a first stop valve (9), a third stop valve (11) and a sixth stop valve (14);

the first stop valve (9) is arranged between the end C2 of the second four-way reversing valve (4) and the end S1 of the first four-way reversing valve (3), the third stop valve (11) is arranged between the ends C1 of the first outdoor unit heat exchanger (1), one end of the sixth stop valve (14) is connected between the second outdoor unit heat exchanger (2) and the seventh stop valve (15), and the other end of the sixth stop valve (14) is connected with the end E1 of the first four-way reversing valve (3).

6. The outdoor unit non-stop defrosting system according to any one of claims 1 to 5, wherein the first throttling assembly includes a first throttling part (7) and a fifth stop valve (13) connected in series, and a fourth stop valve (12) connected in parallel with both ends of the first throttling part (7) and the fifth stop valve (13) connected in series;

the second throttling assembly comprises a second throttling piece (8) and a ninth stop valve (17) which are connected in series, and an eighth stop valve (16) which is connected with the second throttling piece (8) and the ninth stop valve (17) in series in parallel.

7. The outdoor unit non-stop defrosting system of claim 6 wherein the first throttle member (7) and the second throttle member (8) are electronic expansion valves, capillary tubes or thermal expansion valves.

8. An air conditioner, comprising the outdoor unit non-stop defrosting system of any one of claims 1 to 7.

9. The air conditioner according to claim 8, further comprising a second cut-off valve (10), wherein one end of the second cut-off valve (10) is connected between the second four-way selector valve (4) and the first cut-off valve (9), and the other end of the second cut-off valve (10) is connected to the first outdoor unit heat exchanger (1).

10. The air conditioner as claimed in claim 8, further comprising fans, the number of which is the same as the number of heat exchangers.

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