A composite multi-mode heat pump system and working method thereof

Abstract

The present application discloses a composite multi-mode heat pump system and its working method. The heat pump system includes a compressor, a condenser, a first three-way pipe, an ejector, a gas-liquid separator, a second three-way pipe, a first evaporator, a second evaporator, an auxiliary heat-collecting evaporator, a third three-way pipe and a four-way pipe. The compressor is used to increase the temperature and pressure of the gas; the condenser is used to release heat and condense the gas; the ejector is used to eject the high-pressure working fluid from the low-pressure working fluid to improve the system efficiency; the gas-liquid separator is used to separate the gas and liquid in the fluid; the first evaporator and the second evaporator are both used to evaporate the liquid; the auxiliary heat-collecting evaporator is used to replenish air to the compressor to assist in improving the efficiency of the heat pump. The present application replenishes air to the compressor through the auxiliary heat-collecting evaporator, thereby improving the heating efficiency of the heat pump; and two evaporators are provided. When one of the evaporators is defrosted, the other evaporator can operate normally, reducing the impact of the defrosting process on the efficiency of the heat pump system.

Description

Technical Field

[0001] The present application relates to the field of heat pump technology, and in particular to a composite multi-mode heat pump system and a working method thereof. Background Art

[0002] In the process of continuous development of heat pump technology, problems such as outdoor evaporator frosting, low operating efficiency in low temperature environment and difficulty in expansion work recovery are long-standing problems in the field of heat pumps. With the increase in global energy utilization demand and the deterioration of environmental climate, heating requirements are gradually increasing. The increase in heat pump heating demand and the development of high-efficiency heat pump technology have become a general trend. The large demand for heat pumps in low temperature environments and the difficulty of heat pumps to achieve efficient and stable operation in low temperature environments are inseparable contradictions. Therefore, how to achieve efficient and stable heating of heat pumps in low temperature environments is the key prerequisite for the promotion and application of heat pump technology.

[0003] Based on the traditional steam compression heat pump cycle system, many scholars have proposed multi-stage compression heat pump cycle, cascade heat pump cycle system, intermediate air-supplement heat pump cycle and ejector-enhanced heat pump cycle. One type of optimization scheme is to improve the overall performance of the system by reusing the heat energy and pressure energy of the condenser outlet fluid. For example, the intermediate air-supplement heat pump cycle is mostly divided at the condenser outlet, and an intermediate heat exchanger is added between the two fluids to achieve the effect of supercooling and compressor air-supplement, which can effectively reduce the compressor exhaust temperature and reduce the compression power consumption. The intermediate air-supplement branch can realize the recovery of part of the heat energy and pressure energy of the condenser outlet fluid. The ejector-compression heat pump cycle system can use the condenser outlet fluid as the high-pressure working fluid of the ejector and the working fluid of the evaporator outlet as the low-pressure ejector fluid. The high-pressure working fluid is used to eject the low-pressure fluid to increase the pressure of the low-pressure fluid, save the compressor power consumption, reduce the pressure ratio of the compressor, and thus improve the working efficiency of the compressor.

[0004] However, on the one hand, the efficiency of the ejector is determined by the pressure difference of the system. When the pressure difference in the system is too small, the low efficiency of the ejector will affect the operating efficiency of the heat pump system. When the pressure difference in the system is too large, the ejector is effective in improving the heat pump system, but the performance of the heat pump system itself will also decrease. The two are an inseparable contradiction. Therefore, how to take into account the operating efficiency of both the ejector and the heat pump system at the same time is a major technical difficulty in improving the performance of the injection-compression heat pump. On the other hand, the frosting problem of the evaporator of the heat pump system is also an important obstacle to the development of heat pumps. Traditional defrosting methods are mostly reverse cycle defrosting, hot gas bypass defrosting, heat storage defrosting, etc., which will reduce the operating efficiency of the heat pump system during the defrosting process. Summary of the invention

[0005] The purpose of the present application is to solve at least one of the technical problems existing in the prior art, and to provide a composite multi-mode heat pump system and a working method thereof, which can improve the operating efficiency of the heat pump system and reduce the impact of the evaporator defrosting process on the heat pump system.

[0006] According to a first aspect of the present application, there is provided a composite multi-mode heat pump system, comprising:

[0007] compressor;

[0008] a condenser, the condenser being connected to the compressor;

[0009] a first tee pipe, wherein a first opening of the first tee pipe is connected to the condenser;

[0010] an injector, the inlet of the injector being connected to the second opening of the first three-way pipe;

[0011] A gas-liquid separator, wherein the gas-liquid separator is connected to the outlet of the ejector, and the gas outlet of the gas-liquid separator is connected to the compressor;

[0012] a second tee pipe, wherein a first opening of the second tee pipe is connected to a liquid outlet of the gas-liquid separator;

[0013] a first evaporator, the first evaporator being connected to the second opening of the second three-way pipe;

[0014] a second evaporator, the second evaporator being connected to the third opening of the second three-way pipe;

[0015] an auxiliary heat collection evaporator, the auxiliary heat collection evaporator being connected to the compressor;

[0016] a third three-way pipe, wherein a first opening of the third three-way pipe is connected to the auxiliary heat collection evaporator, and a second opening of the third three-way pipe is connected to the second evaporator;

[0017] A four-way pipe, wherein the first opening of the four-way pipe is connected to the third opening of the first three-way pipe, the second opening of the four-way pipe is connected to the first evaporator, the third opening of the four-way pipe is connected to the ejector, and the fourth opening of the four-way pipe is connected to the third opening of the third three-way pipe.

[0018] According to the first aspect of the present application, further, the auxiliary heat collection evaporator is specifically a solar heat collection evaporator, an electric heat collection evaporator or a wind heat collection evaporator.

[0019] According to the first aspect embodiment of the present application, further, the composite multi-mode heat pump system also includes a first throttle valve, which is arranged between the first evaporator and the second three-way pipe, and is used to control the flow rate of the fluid flowing through the first evaporator.

[0020] According to the first aspect embodiment of the present application, further, the composite multi-mode heat pump system also includes a second throttle valve, which is arranged between the second evaporator and the second three-way pipe to control the flow rate of the fluid flowing through the second evaporator.

[0021] According to the first aspect embodiment of the present application, further, the composite multi-mode heat pump system also includes a fourth three-way pipe, a fifth three-way pipe and a third throttle valve arranged between the third three-way pipe and the four-way pipe, and the fourth three-way pipe, the third throttle valve and the fifth three-way pipe are connected in sequence to form a branch pipe structure, and the fluid can flow directly from the fourth three-way pipe to the fifth three-way pipe, or flow through the fourth three-way pipe and the third throttle valve in sequence and then flow to the fifth three-way pipe.

[0022] According to the second aspect of the present application, a working method for the above-mentioned composite multi-mode heat pump system is provided, including an auxiliary heat pump mode, a normal heat pump mode, a first evaporator defrost mode and a second evaporator defrost mode.

[0023] According to the second aspect of the present application, further, the working method of the auxiliary heat pump mode includes:

[0024] Turning on the compressor, the condenser, the ejector, the gas-liquid separator and the first evaporator;

[0025] The compressor, the condenser, the first three-way pipe, the ejector and the gas-liquid separator constitute a heat pump heating main cycle, and the condenser outputs heat to the outside;

[0026] The first three-way pipe divides the gas, and another part of the gas flows through the four-way pipe and the auxiliary heat collection evaporator and then flows to the compressor, and the auxiliary heat collection evaporator assists in heating the gas;

[0027] The liquid separated from the gas-liquid separator flows through the second three-way pipe, the first evaporator, the four-way pipe, the ejector, and then flows back to the gas-liquid separator. The first evaporator is used to evaporate the liquid.

[0028] According to the second aspect of the present application, further, the working method of the ordinary heat pump mode includes:

[0029] Turning on the compressor, the condenser, the ejector, the gas-liquid separator and the first evaporator;

[0030] The compressor, the condenser, the first three-way pipe, the ejector and the gas-liquid separator constitute a heat pump heating main cycle, and the condenser outputs heat to the outside;

[0031] The liquid separated from the gas-liquid separator flows through the second three-way pipe, the first evaporator, the four-way pipe, the ejector, and then flows back to the gas-liquid separator. The first evaporator is used to evaporate the liquid.

[0032] According to the second aspect of the present application, further, the working method of the first evaporator defrost mode includes:

[0033] Turning on the compressor, the condenser, the ejector, the gas-liquid separator and the second evaporator;

[0034] The compressor, the condenser, the first three-way pipe, the ejector and the gas-liquid separator constitute a heat pump heating main cycle, and the condenser outputs heat to the outside;

[0035] The first three-way pipe divides the gas, and another part of the gas flows through the four-way pipe and the first evaporator and then flows to the second three-way pipe, and the high-temperature gas defrosts the first evaporator and produces condensed liquid;

[0036] The liquid separated from the gas-liquid separator flows to the second three-way pipe and merges with the liquid flowing out of the first evaporator, and then flows through the second evaporator, the four-way pipe, and the ejector in sequence before returning to the gas-liquid separator. The second evaporator is used to evaporate the liquid.

[0037] According to the second aspect of the present application, further, the working method of the second evaporator defrost mode includes:

[0038] Turning on the compressor, the condenser, the ejector, the gas-liquid separator and the first evaporator;

[0039] The compressor, the condenser, the first three-way pipe, the ejector and the gas-liquid separator constitute a heat pump heating main cycle, and the condenser outputs heat to the outside;

[0040] The first three-way pipe divides the gas, and another part of the gas flows through the four-way pipe and the second evaporator and then flows to the second three-way pipe, and the high-temperature gas defrosts the second evaporator and produces condensed liquid;

[0041] The liquid separated from the gas-liquid separator flows to the second three-way pipe and merges with the liquid flowing out of the second evaporator, and then flows through the first evaporator, the four-way pipe, and the ejector in sequence before returning to the gas-liquid separator. The first evaporator is used to evaporate the liquid.

[0042] The beneficial effects of the embodiments of the present application include at least: the present application supplements air to the compressor through an auxiliary heat-collecting evaporator, thereby improving the heating efficiency of the heat pump; and two evaporators are provided, when one of the evaporators is defrosted, the other evaporator can operate normally, reducing the impact of the defrosting process on the efficiency of the heat pump system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief description of the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present application, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0044] Figure 1 is a connection diagram of a composite multi-mode heat pump system according to an embodiment of the first aspect of the present application;

[0045] Figure 2 It is a schematic diagram of the auxiliary heat pump mode in the working method of the embodiment of the second aspect of the present application;

[0046] Figure 3 It is a schematic diagram of a common heat pump mode in the working method of the embodiment of the second aspect of the present application;

[0047] Figure 4 It is a schematic diagram of a first evaporator defrosting mode in the working method of the embodiment of the second aspect of the present application;

[0048] Figure 5 It is a schematic diagram of the second evaporator defrost mode in the working method of the second aspect embodiment of the present application.

[0049] Figure markings: 1-compressor, 2-condenser, 3-first three-way pipe, 4-four-way pipe, 5-fourth three-way pipe, 6-third throttle valve, 7-fifth three-way pipe, 8-third three-way pipe, 9-second evaporator, 10-second throttle valve, 11-second three-way pipe, 12-first throttle valve, 13-first evaporator, 14-ejector, 15-gas-liquid separator, 16-auxiliary heat collection evaporator. DETAILED DESCRIPTION

[0050] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0051] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0053] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0054] The present application proposes a composite multi-mode heat pump system and a working method thereof. The present application supplements air to the compressor 1 through an auxiliary heat-collecting evaporator 16, thereby improving the heating efficiency of the heat pump. In addition, two evaporators are provided. When one of the evaporators is defrosted, the other evaporator can operate normally, thereby reducing the impact of the defrosting process on the efficiency of the heat pump system.

[0055] Reference Figure 1 The composite multi-mode heat pump system in the embodiment of the first aspect of the present application includes a compressor 1, a condenser 2, a first three-way pipe 3, an ejector 14, a gas-liquid separator 15, a second three-way pipe 11, a first evaporator 13, a second evaporator 9, an auxiliary heat collection evaporator 16, a third three-way pipe 8 and a four-way pipe 4. The compressor 1 is used to increase the temperature and pressure of the gas; the condenser 2 is used to make the gas release heat and condense to transfer the heat to the outside; the ejector 14 is used to eject the high-pressure working fluid from the low-pressure working fluid to improve the system efficiency; the gas-liquid separator 15 is used to separate the gas and liquid in the fluid; the first evaporator 13 and the second evaporator 9 are both used to evaporate the liquid to convert it into gas; the auxiliary heat collection evaporator 16 is used to supplement the compressor 1 with gas to assist in improving the efficiency of the heat pump.

[0056] Specifically, the condenser 2 is connected to the compressor 1; the first opening of the first three-way pipe 3 is connected to the condenser 2; the inlet of the ejector 14 is connected to the second opening of the first three-way pipe 3; the gas-liquid separator 15 is connected to the outlet of the ejector 14, and the gas outlet of the gas-liquid separator 15 is connected to the compressor 1; the first opening of the second three-way pipe 11 is connected to the liquid outlet of the gas-liquid separator 15; the first evaporator 13 is connected to the second opening of the second three-way pipe 11; the second evaporator 9 is connected to the third opening of the second three-way pipe 11; the auxiliary heat collection evaporator 16 is connected to the compressor 1; the first opening of the third three-way pipe 8 is connected to the auxiliary heat collection evaporator 16, and the second opening of the third three-way pipe 8 is connected to the second evaporator 9; the first opening of the four-way pipe 4 is connected to the third opening of the first three-way pipe 3, the second opening of the four-way pipe 4 is connected to the first evaporator 13, the third opening of the four-way pipe 4 is connected to the ejector 14, and the fourth opening of the four-way pipe 4 is connected to the third opening of the third three-way pipe 8.

[0057] Furthermore, the auxiliary heat collection evaporator 16 is specifically a solar heat collection evaporator, an electric heat collection evaporator or a wind heat collection evaporator, which can use clean energy for auxiliary heating and is more environmentally friendly.

[0058] Furthermore, the composite multi-mode heat pump system further includes a first throttle valve 12 , which is disposed between the first evaporator 13 and the second three-way pipe 11 and is used to control the flow rate of the fluid flowing through the first evaporator 13 .

[0059] Furthermore, the composite multi-mode heat pump system further includes a second throttle valve 10 , which is disposed between the second evaporator 9 and the second three-way pipe 11 and is used to control the flow rate of the fluid flowing through the second evaporator 9 .

[0060] Furthermore, the composite multi-mode heat pump system further includes a fourth three-way pipe 5, a fifth three-way pipe 7 and a third throttle valve 6 arranged between the third three-way pipe 8 and the four-way pipe 4. The fourth three-way pipe 5, the third throttle valve 6 and the fifth three-way pipe 7 are sequentially connected to form a branch pipe structure, and the fluid can flow directly from the fourth three-way pipe 5 to the fifth three-way pipe 7, or flow through the fourth three-way pipe 5 and the third throttle valve 6 in sequence and then flow to the fifth three-way pipe 7.

[0061] The working method in the embodiment of the second aspect of the present application is based on the above-mentioned composite multi-mode heat pump system, including an auxiliary heat pump mode, a normal heat pump mode, a first evaporator defrost mode and a second evaporator defrost mode.

[0062] refer to Figure 2 , the working method of auxiliary heat pump mode includes:

[0063] S110. Turn on the compressor 1, the condenser 2, the ejector 14, the gas-liquid separator 15 and the first evaporator 13;

[0064] S120. The compressor 1, the condenser 2, the first three-way pipe 3, the ejector 14 and the gas-liquid separator 15 constitute the main cycle of heat pump heating, and the condenser 2 outputs heat to the outside;

[0065] S130. The first three-way pipe 3 splits the gas, a part of the gas enters the heat pump heating main cycle, and the other part of the gas flows through the four-way pipe 4 and the auxiliary heat collection evaporator 16 and then flows to the compressor 1. At this time, the fourth three-way pipe 5 and the fifth three-way pipe 7 open the branch to allow the gas to flow through the third throttle valve 6 to reduce the gas pressure; the auxiliary heat collection evaporator 16 assists in heating the gas;

[0066] S140. The liquid separated from the gas-liquid separator 15 flows through the second three-way pipe 11, the first evaporator 13, the four-way pipe 4, and the ejector 14 and then flows back to the gas-liquid separator 15. The first throttle valve 12 reduces the pressure of the liquid entering the first evaporator 13. The first evaporator 13 is used to evaporate the liquid to recover the high-temperature gas.

[0067] Reference Figure 3 , the working methods of the ordinary heat pump mode include:

[0068] S210. Start the compressor 1, the condenser 2, the ejector 14, the gas-liquid separator 15 and the first evaporator 13;

[0069] S220. The compressor 1, the condenser 2, the first three-way pipe 3, the ejector 14 and the gas-liquid separator 15 constitute the main cycle of heat pump heating, and the condenser 2 outputs heat to the outside;

[0070] S230. The liquid separated from the gas-liquid separator 15 flows through the second three-way pipe 11, the first evaporator 13, the four-way pipe 4, and the ejector 14 and then flows back to the gas-liquid separator 15. The first throttle valve 12 reduces the pressure of the liquid entering the first evaporator 13. The first evaporator 13 is used to evaporate the liquid.

[0071] Reference Figure 4 , the working method of the first evaporator defrost mode includes:

[0072] S310. Start the compressor 1, the condenser 2, the ejector 14, the gas-liquid separator 15 and the second evaporator 9;

[0073] S320. The compressor 1, the condenser 2, the first three-way pipe 3, the ejector 14 and the gas-liquid separator 15 constitute the main cycle of heat pump heating, and the condenser 2 outputs heat to the outside;

[0074] S330. The first three-way pipe 3 splits the gas, a part of the gas enters the heat pump heating main cycle, and the other part of the gas flows through the four-way pipe 4 and the first evaporator 13 and then flows to the second three-way pipe 11. The high-temperature gas defrosts the first evaporator 13 and produces condensed liquid;

[0075] S340. The liquid separated from the gas-liquid separator 15 flows to the second three-way pipe 11 to merge with the liquid flowing out of the first evaporator 13, and then flows through the second evaporator 9, the four-way pipe 4, and the ejector 14 in sequence before returning to the gas-liquid separator 15. The second throttle valve 10 reduces the pressure of the liquid entering the second evaporator 9, and the second evaporator 9 is used to evaporate the liquid.

[0076] Reference Figure 5 , the working method of the second evaporator defrost mode includes:

[0077] S410. Start the compressor 1, the condenser 2, the ejector 14, the gas-liquid separator 15 and the first evaporator 13;

[0078] S420. The compressor 1, the condenser 2, the first three-way pipe 3, the ejector 14 and the gas-liquid separator 15 constitute the main cycle of heat pump heating, and the condenser 2 outputs heat to the outside;

[0079] S430. The first three-way pipe 3 divides the gas, a part of the gas enters the heat pump heating main cycle, and the other part of the gas flows through the four-way pipe 4 and the second evaporator 9 and then flows to the second three-way pipe 11. The high-temperature gas defrosts the second evaporator 9 and produces condensed liquid;

[0080] S440. The liquid separated from the gas-liquid separator 15 flows to the second three-way pipe 11 to merge with the liquid flowing out of the second evaporator 9, and then flows through the first evaporator 13, the four-way pipe 4, and the ejector 14 in sequence before returning to the gas-liquid separator 15. The first throttle valve 12 reduces the pressure of the liquid entering the first evaporator 13, and the first evaporator 13 is used to evaporate the liquid.

[0081] The above is a specific description of the preferred implementation methods of the present application, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application, and these equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A composite multi-mode heat pump system, characterized in that: include: Compressor (1); A condenser (2), the condenser (2) being connected to the compressor (1); A first three-way pipe (3), wherein a first opening of the first three-way pipe (3) is connected to the condenser (2); an ejector (14), the inlet of the ejector (14) being connected to the second opening of the first three-way pipe (3); a gas-liquid separator (15), the gas-liquid separator (15) being connected to the outlet of the ejector (14), and the gas outlet of the gas-liquid separator (15) being connected to the compressor (1); a second three-way pipe (11), wherein a first opening of the second three-way pipe (11) is connected to a liquid outlet of a gas-liquid separator (15); a first evaporator (13), the first evaporator (13) being connected to the second opening of the second three-way pipe (11); a second evaporator (9), the second evaporator (9) being connected to the third opening of the second three-way pipe (11); an auxiliary heat collection evaporator (16), the auxiliary heat collection evaporator (16) being connected to the compressor (1); a third three-way pipe (8), wherein a first opening of the third three-way pipe (8) is connected to the auxiliary heat collection evaporator (16), and a second opening of the third three-way pipe (8) is connected to the second evaporator (9); A four-way pipe (4), wherein a first opening of the four-way pipe (4) is connected to a third opening of the first three-way pipe (3), a second opening of the four-way pipe (4) is connected to the first evaporator (13), a third opening of the four-way pipe (4) is connected to the ejector (14), and a fourth opening of the four-way pipe (4) is connected to a third opening of the third three-way pipe (8).

2. The composite multi-mode heat pump system according to claim 1, characterized in that: The auxiliary heat collection evaporator (16) is specifically a solar heat collection evaporator, an electric heat collection evaporator or a wind heat collection evaporator.

3. The composite multi-mode heat pump system according to claim 1, characterized in that: The composite multi-mode heat pump system further comprises a first throttle valve (12), wherein the first throttle valve (12) is arranged between the first evaporator (13) and the second three-way pipe (11), and is used to control the flow rate of the fluid flowing through the first evaporator (13).

4. The composite multi-mode heat pump system according to claim 1, characterized in that: The composite multi-mode heat pump system further comprises a second throttle valve (10), wherein the second throttle valve (10) is arranged between the second evaporator (9) and the second three-way pipe (11) and is used to control the flow rate of the fluid flowing through the second evaporator (9).

5. The composite multi-mode heat pump system according to claim 1, characterized in that: The composite multi-mode heat pump system further comprises a fourth three-way pipe (5), a fifth three-way pipe (7) and a third throttle valve (6) arranged between the third three-way pipe (8) and the four-way pipe (4); the fourth three-way pipe (5), the third throttle valve (6) and the fifth three-way pipe (7) are connected in sequence to form a branch pipe structure, and the fluid can flow directly from the fourth three-way pipe (5) to the fifth three-way pipe (7), or flow through the fourth three-way pipe (5) and the third throttle valve (6) in sequence and then flow to the fifth three-way pipe (7).

6. A working method for the composite multi-mode heat pump system according to any one of claims 1 to 5, characterized in that: It includes auxiliary heat pump mode, normal heat pump mode, first evaporator defrost mode and second evaporator defrost mode.

7. The working method according to claim 6, characterized in that: The working method of the auxiliary heat pump mode includes: Turning on the compressor (1), the condenser (2), the ejector (14), the gas-liquid separator (15) and the first evaporator (13); The compressor (1), the condenser (2), the first three-way pipe (3), the ejector (14) and the gas-liquid separator (15) constitute a heat pump heating main cycle, and the condenser (2) outputs heat to the outside; The first three-way pipe (3) divides the gas, and another part of the gas flows through the four-way pipe (4) and the auxiliary heat collection evaporator (16) and then flows to the compressor (1), and the auxiliary heat collection evaporator (16) assists in heating the gas; The liquid separated from the gas-liquid separator (15) flows through the second three-way pipe (11), the first evaporator (13), the four-way pipe (4), the ejector (14), and then flows back to the gas-liquid separator (15). The first evaporator (13) is used to evaporate the liquid.

8. The working method according to claim 6, characterized in that: The working method of the ordinary heat pump mode includes: Turning on the compressor (1), the condenser (2), the ejector (14), the gas-liquid separator (15) and the first evaporator (13); The compressor (1), the condenser (2), the first three-way pipe (3), the ejector (14) and the gas-liquid separator (15) constitute a heat pump heating main cycle, and the condenser (2) outputs heat to the outside; The liquid separated from the gas-liquid separator (15) flows through the second three-way pipe (11), the first evaporator (13), the four-way pipe (4), the ejector (14), and then flows back to the gas-liquid separator (15). The first evaporator (13) is used to evaporate the liquid.

9. The working method according to claim 6, characterized in that: The working method of the first evaporator defrost mode includes: Turning on the compressor (1), the condenser (2), the ejector (14), the gas-liquid separator (15) and the second evaporator (9); The compressor (1), the condenser (2), the first three-way pipe (3), the ejector (14) and the gas-liquid separator (15) constitute a heat pump heating main cycle, and the condenser (2) outputs heat to the outside; The first three-way pipe (3) divides the gas, and another part of the gas flows through the four-way pipe (4) and the first evaporator (13) and then flows to the second three-way pipe (11), and the high-temperature gas defrosts the first evaporator (13) and produces condensed liquid; The liquid separated from the gas-liquid separator (15) flows to the second three-way pipe (11) to merge with the liquid flowing out of the first evaporator (13), then flows through the second evaporator (9), the four-way pipe (4), and the ejector (14) in sequence before flowing back to the gas-liquid separator (15). The second evaporator (9) is used to evaporate the liquid.

10. The working method according to claim 6, characterized in that: The working method of the second evaporator defrost mode includes: Turning on the compressor (1), the condenser (2), the ejector (14), the gas-liquid separator (15) and the first evaporator (13); The compressor (1), the condenser (2), the first three-way pipe (3), the ejector (14) and the gas-liquid separator (15) constitute a heat pump heating main cycle, and the condenser (2) outputs heat to the outside; The first three-way pipe (3) divides the gas, and another part of the gas flows through the four-way pipe (4) and the second evaporator (9) and then flows to the second three-way pipe (11), and the high-temperature gas defrosts the second evaporator (9) and produces condensed liquid; The liquid separated from the gas-liquid separator (15) flows to the second three-way pipe (11) to merge with the liquid flowing out of the second evaporator (9), then flows through the first evaporator (13), the four-way pipe (4), and the ejector (14) in sequence before returning to the gas-liquid separator (15). The first evaporator (13) is used to evaporate the liquid.

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