Energy storage type heat pump structure

Abstract

The invention discloses an energy storage type heat pump structure which comprises a compressor. A condenser; an evaporator; the pipeline assembly comprises a first pipeline, a second pipeline, a third pipeline, a heat exchange pipe, a first valve body and a second valve body, one end of the first pipeline communicates with an outlet of the compressor, the other end of the first pipeline communicates with a first branch pipe and a second branch pipe, the first branch pipe communicates with the first communicating opening, and the second branch pipe communicates with the second communicating opening; the second communication port is communicated with the inlet end of the heat exchange pipe through a second pipeline, and the second branch pipe is communicated with the inlet end of the heat exchange pipe; the outlet end of the heat exchange pipe communicates with the third communication opening through a third pipeline. The fourth communication opening is communicated with an inlet of the compressor; a first valve body is arranged on the first branch pipe; a second valve body is arranged on the second branch pipe; and the energy storage water tank exchanges heat with the heat exchange pipe. Defrosting operation is carried out through waste heat stored in the energy storage water tank, and the defrosting action can be carried out without absorbing indoor waste heat.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to an energy storage type heat pump structure. Background Art

[0002] A heat pump generally includes pipes that connect the heat pump to the water tank, water pump, evaporator, condenser, compressor and other components as required. The evaporator is installed outdoors and the compressor is installed indoors. The outside air is inhaled through the fan. The heat in the air is absorbed by the refrigerant in the evaporator, causing the refrigerant to change from liquid to gas and the temperature to rise. Even in a low temperature environment, the air still contains a certain amount of heat that can be absorbed and utilized.

[0003] When the heat pump is working, the gaseous refrigerant is compressed by the compressor, and the compressor does work on the refrigerant, causing the pressure and temperature of the refrigerant to further increase. At this time, the work done by the compressor is converted into the internal energy of the refrigerant gas, turning it into a high-temperature and high-pressure gas. The high-temperature and high-pressure gas flows into the condenser, exchanges heat with the water around the condenser or the indoor air, and releases a large amount of heat, causing the water temperature to rise or the indoor air to warm up. In this process, the refrigerant cools and condenses into a liquid. The liquid refrigerant passes through throttling devices such as expansion valves, and the pressure and temperature of the liquid refrigerant decreases, becoming a low-temperature and low-pressure liquid refrigerant in preparation for the next cycle. The low-temperature and low-pressure refrigerant liquid re-enters the evaporator and absorbs the heat in the air again. This cycle repeats, continuously moving the heat in the air into the room, and achieving continuous heating.

[0004] When the heat pump is in use, if it is running in a low temperature environment, the water vapor in the outdoor air will condense into frost on the surface of the evaporator when it encounters cold. As the frost layer continues to thicken, it will increase the thermal resistance of the heat exchanger, reduce its heat exchange efficiency, and cause the heating capacity of the heat pump to decrease, and the indoor heating effect to deteriorate. Therefore, it is necessary to defrost the outdoor evaporator before normal heating can be completed.

[0005] The existing practice is to use the refrigerant to absorb the indoor waste heat for defrosting before normal use. In this way, the refrigerant needs to flow over a long path, so the defrosting time is long, which affects the heating efficiency of the heat pump. Summary of the invention

[0006] In order to overcome at least one of the defects of the above-mentioned prior art, the present invention provides an energy storage heat pump structure, which can be provided with an energy storage water tank, and the water in the energy storage water tank absorbs the heat exchange waste heat of the refrigerant. After the waste heat is stored, the waste heat stored in the energy storage water tank is used for defrosting operation, and the defrosting operation can be performed without absorbing the indoor waste heat.

[0007] The technical solution adopted by the present invention to solve the problem is:

[0008] An energy storage heat pump structure, comprising:

[0009] compressor;

[0010] A condenser, the condenser is used for exchanging heat with indoor air, and the condenser is provided with a first conduction port and a second conduction port;

[0011] An evaporator, the evaporator is used for exchanging heat with outdoor air, and the evaporator is provided with a third conduction port and a fourth conduction port;

[0012] A pipeline assembly, the pipeline assembly includes a first pipeline, a second pipeline, a third pipeline, a heat exchange tube, a first valve body and a second valve body, one end of the first pipeline is connected to the outlet of the compressor, the other end of the first pipeline is connected to a first branch pipe and a second branch pipe, the first branch pipe is connected to the first conduction port, the second conduction port is connected to the inlet end of the heat exchange tube through the second pipeline, and the second branch pipe is connected to the inlet end of the heat exchange tube; the outlet end of the heat exchange tube is connected to the third conduction port through the third pipeline; the fourth conduction port is connected to the inlet of the compressor; the first branch pipe is provided with a first valve body; the second branch pipe is provided with a second valve body;

[0013] An energy storage water tank is used to store water and exchange heat with the heat exchange tube.

[0014] Furthermore, the heat exchange tube is arranged inside the energy storage water tank.

[0015] Furthermore, the heat exchange tube coil is arranged inside the energy storage water tank.

[0016] Furthermore, the pipeline assembly also includes a third valve body, and the third valve body is provided on the second pipeline.

[0017] Furthermore, the energy storage heat pump structure also includes an oil-liquid separation component, which also includes an oil separator and a fourth pipeline, the oil separator is provided with a first inlet, a first outlet and a second outlet, the first inlet is arranged at the top of the oil separator, the first outlet is arranged at the side of the oil separator, and the second outlet is arranged at the bottom of the oil separator; one end of the fourth pipeline is connected to the outlet of the compressor, the other end of the fourth pipeline is connected to the first inlet, the first pipeline is connected to the first outlet, the second outlet is connected to one end of the fourth pipeline, and the other end of the fourth pipeline is connected to the oil return port of the compressor.

[0018] Furthermore, the fourth pipe is a capillary tube.

[0019] Furthermore, the condenser is provided in plurality, the first branch pipe is connected to the first conduction ports of the plurality of condensers through the plurality of third branch pipes; the second conduction ports of the plurality of condensers are all connected to the second pipeline.

[0020] Furthermore, the evaporator is provided with a temperature detector, and the temperature detector is used to detect the frosting temperature of the evaporator and send a temperature signal; the first valve body and the second valve body are both used to receive the temperature signal.

[0021] Furthermore, a throttling device is provided on the third pipeline.

[0022] Furthermore, the fourth conducting port is connected to the inlet of the vapor-liquid separator through a fifth pipeline, and the outlet of the vapor-liquid separator is connected to the inlet of the compressor.

[0023] In summary, the present invention has the following technical effects:

[0024] When defrosting, the refrigerant discharged from the compressor does not need to enter the condenser to absorb the waste heat in the room, but can be directly introduced into the heat exchange tube through the second branch pipe to absorb the waste heat stored in the energy storage tank. This reduces the flow path of the refrigerant during the defrosting process, and the defrosting flow path is shortened, and the defrosting speed is fast.

[0025] In addition, the hot water in the energy storage tank is heated by the waste heat of the refrigerant during the heating process, and this waste heat is used to perform the defrosting action of the heat pump, which improves the energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the oil separator of the present invention.

[0028] Among them, the meanings of the figure numbers are as follows: 10, compressor; 20, condenser; 30, evaporator; 40, energy storage water tank; 41, heat exchange tube; 51, first pipeline; 511, first branch pipe; 512, second branch pipe; 513, first valve body; 514, second valve body; 52, second pipeline; 521, third valve body; 53, third pipeline; 60, oil separator; 61, fourth pipeline. DETAILED DESCRIPTION

[0029] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] See also Figure 1 as well as Figure 2 The present invention discloses an energy storage heat pump structure, including a compressor 10, a condenser 20, an evaporator 30 and a pipeline assembly. The condenser 20 can exchange heat with indoor air, and the condenser 20 is provided with a first conduction port and a second conduction port. The evaporator 30 can exchange heat with outdoor air, and the evaporator 30 is provided with a third conduction port and a fourth conduction port.

[0033] The specific pipeline assembly includes a first pipeline 51, a second pipeline 52, a third pipeline 53, a heat exchange tube 41, a first valve body 513 and a second valve body 514. One end of the first pipeline 51 is connected to the outlet of the compressor 10, and the other end of the first pipeline 51 is connected to a first branch pipe 511 and a second branch pipe 512. The first branch pipe 511 is connected to the first conducting port, the second conducting port is connected to the inlet end of the heat exchange tube 41 through the second pipeline 52, and the second branch pipe 512 is connected to the inlet end of the heat exchange tube 41; the outlet end of the heat exchange tube 41 is connected to the third conducting port through the third pipeline 53, and the fourth conducting port is connected to the inlet of the compressor 10; the first branch pipe 511 is provided with a first valve body 513; the second branch pipe 512 is provided with a second valve body 514.

[0034] The energy storage water tank 40 is used to store water and exchange heat with the heat exchange tube 41. The heat exchange tube 41 can be arranged inside the energy storage water tank 40 to exchange heat with the water in the energy storage water tank 40, or the heat exchange tube 41 can be arranged outside the energy storage water tank 40 to exchange heat with the water in the energy storage water tank 40.

[0035] On the basis of the above structure, when the energy storage heat pump structure of the present invention is used, during normal heating operation, the first valve body 513 is opened and the second valve body 514 is closed. In this way, the gaseous refrigerant is compressed by the compressor 10, and the compressor 10 works on the refrigerant, so that the pressure and temperature of the refrigerant are further increased. At this time, the work done by the compressor 10 is converted into the internal energy of the refrigerant gas, making it a high-temperature and high-pressure gas. The high-temperature and high-pressure gas flows into the first pipeline 51 through the outlet of the compressor 10. Since the second valve body 514 is closed and the first valve body 513 is opened, the refrigerant in the first pipeline 51 can enter the first conduction port of the condenser 20 through the first branch pipe 511 and flow into the condenser 20. In this way, the condenser 20 exchanges heat with the indoor air, releasing a large amount of heat, so that the water temperature rises or the indoor air becomes warmer, and the refrigerant cools and condenses into liquid in the process.

[0036] Since the refrigerant still has a certain amount of residual heat after releasing a large amount of heat through heat exchange with the condenser 20 and the indoor air, the refrigerant with residual heat can enter the second pipe 52 through the second conducting port, and then enter the heat exchange tube 41 through the second pipe 52. The refrigerant with residual heat in the heat exchange tube 41 can exchange heat with the water in the energy storage tank 40, and use the residual heat to heat the water in the water storage tank.

[0037] Then the refrigerant in the heat exchange tube 41 is guided to the third pipe 53 through the outlet end of the heat exchange tube 41, and is guided to the third conduction port through the third pipe 53 to be introduced into the evaporator 30, and enters the low-temperature and low-pressure refrigerator after the evaporator 30 to absorb the heat in the air again, and the cycle is repeated to continuously carry the heat in the air to the room to achieve continuous heating. The heat absorbed from the air enters the inlet of the compressor 10 through the fourth conduction port, and the cycle is repeated to achieve indoor heating.

[0038] During the heating process, the residual heat in the refrigerant in the heat exchange tube 41 can continuously exchange heat with the water in the energy storage water tank 40, so that the water temperature in the energy storage water tank 40 can continuously utilize the residual heat and maintain a certain water temperature. It should be noted that in this embodiment, the water in the energy storage water tank 40 can be heated to a water temperature of about 30 to 40 degrees after heat exchange with the heat exchange tube 41.

[0039] When the outdoor ambient temperature is low, the outer layer of the evaporator 30 located outdoors is prone to frost in the low temperature environment. As the frost layer continues to thicken, the thermal resistance of the heat exchanger will increase, reducing its heat exchange efficiency, resulting in a decrease in the heating capacity of the heat pump and a worse indoor heating effect. At this time, the heat pump can first start the defrosting action. When defrosting, the first valve body 513 can be closed and the second valve body 514 can be opened. At this time, the refrigerant exported from the outlet of the compressor 10 can be exported through the first pipe 51 and introduced into the heat exchange tube 41 through the second branch pipe 512. At this time, the refrigerant in the heat exchange tube 41 can absorb the residual heat in the water in the energy storage water tank 40, and then enter the third pipe 53 through the outlet end of the heat exchange tube 41, and be guided to the third conduction port of the evaporator 30 through the third pipe 53. At this time, the refrigerant in the evaporator 30 absorbs the residual heat in the energy storage water tank 40, and thus can release heat to defrost the surface of the evaporator 30. In this way, when defrosting, the refrigerant exported from the compressor 10 does not need to enter the condenser 20 to absorb the residual heat in the room, but can be directly introduced into the heat exchange tube 41 through the second branch pipe 512 to absorb the residual heat stored in the energy storage water tank 40. In this way, the flow path of the refrigerant is reduced during the defrosting process, and the defrosting flow path end is fast.

[0040] In addition, the hot water in the energy storage water tank 40 is heated by the waste heat of the refrigerant in the heating process, and the heat pump is defrosted by using this waste heat, so that the energy utilization rate is higher.

[0041] Of course, in this embodiment, the compressor 10, the evaporator 30 and the condenser 20 are all existing technologies, and their specific structures and working principles do not belong to the technical content to be protected by this application, and will not be described in detail here.

[0042] More specifically, the heat exchange tube 41 can be arranged inside the energy storage water tank 40, that is, the heat exchange tube 41 is arranged inside the energy storage water tank 40, so that the water in the energy storage water tank 40 can cover the outside of the heat exchange tube 41 and fully contact and exchange heat with the refrigerant in the heat exchange tube 41, so that the heat exchange efficiency is higher and the waste heat of the refrigerant can be fully absorbed and utilized.

[0043] Furthermore, the heat exchange tube 41 is coiled inside the energy storage water tank 40, and the coiled heat exchange tube 41 can increase more heat exchange area within a limited space. Compared with a straight tube, the coiling method increases the length of the heat exchange tube 41, thereby providing a larger surface area for heat transfer, thereby improving the overall heat exchange capacity of the heat exchanger. In addition, when the refrigerant flows in the coiled heat exchange tube 41, it needs to constantly change the flow direction, which will increase the turbulence of the refrigerant. The fluid in the turbulent state can better exchange heat with the wall of the heat exchange tube 41, improve the convective heat transfer coefficient, and then enhance the heat exchange effect, so that the waste heat can be more absorbed by the water in the energy storage water tank 40, improving the heat storage efficiency.

[0044] Furthermore, the above-mentioned pipeline assembly also includes a third valve body 521, and the third valve body 521 can be arranged on the second pipeline 52. In order to prevent the refrigerant remaining in the condenser 20 from flowing into the heat exchange tube 41 during the defrosting action, in addition to closing the first branch pipe 511 through the first valve body 513, the second pipeline 52 can also be closed through the third valve body 521. If the residual refrigerant in the condenser 20 flows to the heat exchange tube 41 in the defrosting state, the temperature of the refrigerant flowing to the heat exchange tube 41 through the compressor 10 through the second branch pipe 512 will be combined, so that the heat exchange temperature difference of the energy storage water tank 40 will be large when heat exchange is required. Therefore, by closing the third valve body 521, the refrigerant in the condenser 20 can be reduced from flowing into the heat exchange tube 41 in this state, and the heat exchange temperature difference of the refrigerant in the heat exchange tube 41 during the defrosting action can be reduced, thereby improving the defrosting efficiency.

[0045] Further, see Figure 2 The energy storage heat pump structure also includes an oil-liquid separation component, which also includes an oil separator 60 and a fourth pipe 61. The oil separator 60 is provided with a first inlet, a first outlet and a second outlet. The first inlet is arranged at the top of the oil separator 60, the first outlet is arranged at the side of the oil separator 60, and the second outlet is arranged at the bottom of the oil separator 60; one end of the fourth pipe 61 is connected to the outlet of the compressor 10, the other end of the fourth pipe 61 is connected to the first inlet, the first pipe 51 is connected to the first outlet, the second outlet is connected to one end of the fourth pipe 61, and the other end of the fourth pipe 61 is connected to the oil return port of the compressor 10.

[0046] During the operation of the compressor 10, in order to improve the operating performance of the compressor 10, lubricating oil is generally set in the pipeline of the compressor 10, so that the lubricating oil flows with the refrigerant during the operation of the compressor 10, thereby reducing the wear caused by friction during high-speed operation. During the operation of the compressor 10, the refrigerant will be compressed into a high-temperature and high-pressure gas and discharged. In this process, the refrigerant oil will be fully mixed with the refrigerant and will be discharged from the compressor 10 together with the refrigerant and enter the circulation pipeline of the refrigeration system.

[0047] In this embodiment, the first inlet of the oil separator 60 is connected to the outlet of the compressor 10. The refrigerant and the lubricating oil are mixed in the compressor 10 and then enter the oil separator 60. The refrigerant is mixed with the lubricating oil and enters the first pipe 51 through the first outlet, and then enters the various circulation components of the heat pump through the first branch pipe 511 or the second branch pipe 512 of the first pipe 51 for circulation and lubrication.

[0048] The refrigerant exported from the compressor 10 is introduced into the condenser 20 through the first branch pipe 511 of the first pipe 51. If the indoor space is large, it is necessary to lay a longer pipe to guide the refrigerant exported from the compressor 10 to the condenser 20 for heat exchange, and then return to the heat exchange pipe 41, evaporator 30 and other structures through a longer return path, and then return to the compressor 10. In this way, the oil return path of the compressor 10 will be longer. Therefore, in this embodiment, the refrigerant entering the oil separator 60 can also be in the oil separator 60. The lubricating oil in the oil-gas mixture discharged from the compressor 10 is separated, and the separated lubricating oil is then directly returned to the compressor 10 through the second outlet through the fourth pipe 61, thereby realizing the recovery of the lubricating oil, which can effectively separate part of the lubricating oil in the refrigerant, improve the oil return efficiency, reduce the amount of lubricating oil entering the circulation pipeline of the heat pump system, and extend the safe operation time of the compressor 10 in the non-return oil state. It is particularly suitable for heat pump structures with longer pipelines.

[0049] Furthermore, the fourth pipe 61 is a capillary tube, which is used to return the lubricating oil of the compressor 10. The oil return capillary tube can return the lubricating oil deposited at the bottom of the oil separator 60 to the compressor 10 under the action of pressure difference, so that the lubricating oil can be recycled and the oil return efficiency is higher.

[0050] Furthermore, there are multiple condensers 20, and the first branch pipe 511 is connected to the first conduction ports of multiple condensers 20 through multiple third branch pipes; the second conduction ports of multiple condensers 20 are all connected to the second pipe 52. In the case where there are multiple condensers 20, the refrigerant guided by the compressor 10 in the first pipe 51 can enter the first branch pipe 511, and then be introduced into different condensers 20 through multiple third branch pipes of the first branch pipe 511, so that the condensers 20 at different positions can perform heat exchange heating at different positions in the room, thereby improving the heating efficiency. The second conduction ports of multiple condensers 20 can all be connected to the second pipe 52, and the second pipe 52 can return the refrigerant after heat release at different positions to the heat exchange pipe 41 and the water in the energy storage water tank 40 for heat exchange.

[0051] Furthermore, the evaporator 30 is provided with a temperature detector, which can detect the frosting temperature of the evaporator 30 and send a temperature signal; the first valve body 513 and the second valve body 514 are both used to receive the temperature signal.

[0052] On the basis of this structure, the heat pump structure includes a host controller, in which a defrost temperature value can be preset. When the frosting temperature of the evaporator 30 detected by the temperature detector of the evaporator 30 reaches the defrost temperature value preset by the host controller, the host controller can control the heat pump to start the defrosting action. That is, the host controller can control the compressor 10 to start, the first valve body 513 to close, and the second valve body 514 to open, so as to perform the defrosting cycle of the refrigerant. When the temperature detector of the evaporator 30 detects that the defrost temperature is higher than the defrost temperature value preset by the host controller, the defrosting action can be stopped and the normal heat pump heating action can be started. At this time, the first valve body 513 can be opened and the second valve body 514 can be closed.

[0053] It should be noted that the first valve body 513, the second valve body 514 and the third valve body 521 are all selected as solenoid valves in the prior art, so that the host controller can open and close them according to the control signal.

[0054] Furthermore, a throttling device is provided on the third pipe 53. The specific throttling device can be a filter, an expansion valve or other structures in the prior art. After releasing heat in the condenser 20, the liquid refrigerant can be discharged to the inlet end of the heat exchange tube 41 through the second conduction port of the condenser 20. After the heat exchange tube 41 exchanges heat with the water in the energy storage water tank 40, the heat exchange tube 41 is guided to the third pipe 53 through the outlet end. When flowing in the third pipe 53, it can be throttled by the throttling device, the pressure is reduced, and the temperature also drops accordingly. After becoming a low-temperature and low-pressure liquid refrigerant, it enters the evaporator 30 through the third conduction port. The low-temperature and low-pressure refrigerant liquid re-enters the evaporator 30, absorbs heat from the air again, and then prepares for the next cycle through the fourth conduction port.

[0055] Furthermore, the fourth conduction port is connected to the inlet of the vapor-liquid separator through the fifth pipeline, and the outlet of the vapor-liquid separator is connected to the inlet of the compressor 10. Since the refrigerant coming out of the evaporator 30 may be in a gas-liquid two-phase state, if it directly enters the compressor 10, the liquid refrigerant entering the compressor 10 may cause liquid hammer, damaging the valve plate, piston and other components of the compressor 10. Therefore, the refrigerant led out of the fourth conduction port of the evaporator 30 can be first guided to the vapor-liquid separator through the fifth pipeline, and the liquid refrigerant can be separated and stored in the vapor-liquid separator, allowing only the gaseous refrigerant to enter the compressor 10, thereby effectively avoiding the occurrence of liquid hammer and extending the service life of the compressor 10.

[0056] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. An energy storage heat pump structure, characterized in that ,include, compressor; A condenser, the condenser is used for exchanging heat with indoor air, and the condenser is provided with a first conduction port and a second conduction port; An evaporator, the evaporator is used for exchanging heat with outdoor air, and the evaporator is provided with a third conduction port and a fourth conduction port; A pipeline assembly, the pipeline assembly includes a first pipeline, a second pipeline, a third pipeline, a heat exchange tube, a first valve body and a second valve body, one end of the first pipeline is connected to the outlet of the compressor, the other end of the first pipeline is connected to a first branch pipe and a second branch pipe, the first branch pipe is connected to the first conduction port, the second conduction port is connected to the inlet end of the heat exchange tube through the second pipeline, and the second branch pipe is connected to the inlet end of the heat exchange tube; the outlet end of the heat exchange tube is connected to the third conduction port through the third pipeline; the fourth conduction port is connected to the inlet of the compressor; the first branch pipe is provided with a first valve body; the second branch pipe is provided with a second valve body; An energy storage water tank is used to store water and exchange heat with the heat exchange tube.

2. The energy storage heat pump structure according to claim 1, characterized in that: The heat exchange tube is arranged inside the energy storage water tank.

3. The energy storage heat pump structure according to claim 2, characterized in that: The heat exchange tube coil is arranged inside the energy storage water tank.

4. The energy storage heat pump structure according to claim 1, characterized in that: The pipeline assembly also includes a third valve body, and the third valve body is arranged on the second pipeline.

5. The energy storage heat pump structure according to claim 1, characterized in that: The energy storage heat pump structure also includes an oil-liquid separation component, which also includes an oil separator and a fourth pipeline. The oil separator is provided with a first inlet, a first outlet and a second outlet. The first inlet is arranged at the top of the oil separator, the first outlet is arranged at the side of the oil separator, and the second outlet is arranged at the bottom of the oil separator; one end of the fourth pipeline is connected to the outlet of the compressor, the other end of the fourth pipeline is connected to the first inlet, the first pipeline is connected to the first outlet, the second outlet is connected to one end of the fourth pipeline, and the other end of the fourth pipeline is connected to the oil return port of the compressor.

6. The energy storage heat pump structure according to claim 5, characterized in that: The fourth channel is a capillary tube.

7. The energy storage heat pump structure according to any one of claims 1 to 6, characterized in that: There are multiple condensers, and the first branch pipe is connected to the first conduction ports of the multiple condensers through multiple third branch pipes; the second conduction ports of the multiple condensers are all connected to the second pipeline.

8. The energy storage heat pump structure according to any one of claims 1 to 6, characterized in that: The evaporator is provided with a temperature detector, and the temperature detector is used to detect the frosting temperature of the evaporator and send a temperature signal; the first valve body and the second valve body are both used to receive the temperature signal.

9. The energy storage heat pump structure according to any one of claims 1 to 6, characterized in that: The third pipeline is provided with a throttling device.

10. The energy storage heat pump structure according to any one of claims 1 to 6, characterized in that: The fourth conducting port is connected to the inlet of the vapor-liquid separator through a fifth pipeline, and the outlet of the vapor-liquid separator is connected to the inlet of the compressor.

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