Energy storage type heat pump structure

Abstract

The utility model 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. According to the utility model, the defrosting operation is carried out by 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] This utility model relates to the field of heat pump technology, and in particular to an energy storage heat pump structure. Background Technology

[0002] A heat pump typically includes pipes connecting the heat pump to components such as a water tank, water pump, evaporator, condenser, and compressor, installed outdoors, and an indoor compressor. It draws in outside air through a fan, and the heat in the air is absorbed by the refrigerant in the evaporator, causing the refrigerant to change from a liquid to a gaseous state and its temperature to rise. Even in low-temperature environments, the air still contains a certain amount of heat that can be absorbed and utilized.

[0003] When a heat pump is working, the gaseous refrigerant is compressed by the compressor. The compressor does work on the refrigerant, further increasing its pressure and temperature. This work is converted into the internal energy of the refrigerant gas, transforming it into a high-temperature, high-pressure gas. This high-temperature, high-pressure gas flows into the condenser, where it exchanges heat with the surrounding water or indoor air, releasing a large amount of heat and raising the water temperature or warming the indoor air. Meanwhile, the refrigerant cools and condenses into a liquid. The liquid refrigerant passes through expansion valves and other throttling devices, reducing its pressure and temperature, becoming a low-temperature, low-pressure liquid refrigerant, ready for the next cycle. The low-temperature, low-pressure liquid refrigerant re-enters the evaporator, absorbing heat from the air again. This cycle repeats continuously, transferring heat from the air to the room, achieving continuous heating.

[0004] When the heat pump is in use, if it operates in a low-temperature environment, water vapor in the outdoor air will condense into frost on the surface of the evaporator. As the frost layer thickens, it increases the thermal resistance of the heat exchanger, reduces its heat exchange efficiency, and causes the heat pump's heating capacity to decrease, resulting in poor indoor heating performance. Therefore, it is necessary to defrost the outdoor evaporator before it can resume normal heating operation.

[0005] The current practice is to use refrigerant to absorb residual heat from the room for defrosting before normal use. This requires the refrigerant to travel a longer path, which results in a longer defrosting time and affects the heating efficiency of the heat pump. Utility Model Content

[0006] In order to overcome at least one of the defects of the prior art, the present invention provides an energy storage heat pump structure, which can be equipped with an energy storage water tank, in which the water absorbs the waste heat of the refrigerant and stores the waste heat. The waste heat stored in the energy storage water tank is then used for defrosting, and the defrosting action can be performed without absorbing indoor waste heat.

[0007] The technical solution adopted by this utility model to solve its problem is:

[0008] A storage heat pump structure, comprising,

[0009] compressor;

[0010] A condenser for exchanging heat with indoor air, the condenser having a first inlet and a second inlet;

[0011] An evaporator for exchanging heat with outdoor air, the evaporator being provided with a third inlet and a fourth inlet;

[0012] A piping assembly includes a first pipe, a second pipe, a third pipe, a heat exchange tube, a first valve body, and a second valve body. One end of the first pipe is connected to the outlet of the compressor, and the other end of the first pipe is connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to a first through-port, and the second through-port is connected to the inlet end of the heat exchange tube through the second pipe. The outlet end of the heat exchange tube is connected to the third through-port through the third pipe. A fourth through-port is connected to the inlet of the compressor. A first valve body is provided on the first branch pipe, and a second valve body is provided on the second branch pipe.

[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 disposed inside the energy storage water tank.

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

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

[0017] Furthermore, the energy storage heat pump structure also includes an oil separation component, which further includes an oil separator and a fourth pipe. The oil separator has a first inlet, a first outlet, and a second outlet. The first inlet is located at the top of the oil separator, the first outlet is located on the side of the oil separator, and the second outlet is located at the bottom of the oil separator. One end of the fourth pipe is connected to the outlet of the compressor, and the other end of the fourth pipe is connected to the first inlet. The first pipe is connected to the first outlet, the second outlet is connected to one end of the fourth pipe, and the other end of the fourth pipe is connected to the oil return port of the compressor.

[0018] Furthermore, the fourth conduit is a capillary.

[0019] Furthermore, the condenser is provided with multiple condensers, and the first branch pipe is connected to the first conduction port of the multiple condensers through multiple third branch pipes; the second conduction port of the multiple condensers is connected to the second pipe.

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

[0021] Furthermore, the third pipe is equipped with a throttling device.

[0022] Furthermore, the fourth conduit is connected to the inlet of the vapor-liquid separator via the fifth pipe, and the outlet of the vapor-liquid separator is connected to the inlet of the compressor.

[0023] In summary, this utility model has the following technical effects:

[0024] During defrosting, the refrigerant discharged from the compressor does not need to enter the condenser to absorb the residual heat in the room. Instead, it is directly introduced into the heat exchange tube through the second branch pipe to absorb the residual heat stored in the energy storage tank. This reduces the flow path of the refrigerant during defrosting, resulting in a faster defrosting speed.

[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 then used for the defrosting action of the heat pump, which results in higher energy utilization. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the oil separator of this utility model.

[0028] The meanings of the reference numerals in the attached drawings are as follows: 10, compressor; 20, condenser; 30, evaporator; 40, energy storage tank; 41, heat exchange tube; 51, first pipe; 511, first branch pipe; 512, second branch pipe; 513, first valve body; 514, second valve body; 52, second pipe; 521, third valve body; 53, third pipe; 60, oil separator; 61, fourth pipe. Detailed Implementation

[0029] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0032] See Figure 1 as well as Figure 2 This utility model discloses an energy storage heat pump structure, including a compressor 10, a condenser 20, an evaporator 30, and a piping assembly. The condenser 20 can exchange heat with indoor air and is provided with a first through port and a second through port. The evaporator 30 can exchange heat with outdoor air and is provided with a third through port and a fourth through port.

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

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

[0035] Based on the above structure, when using the energy storage heat pump structure of this utility model, during normal heating operation, the first valve body 513 is open and the second valve body 514 is closed. As the compressor 10 operates, the gaseous refrigerant is compressed by the compressor 10, which performs work on the refrigerant, further increasing its pressure and temperature. The work done by the compressor 10 is converted into the internal energy of the refrigerant gas, transforming it into a high-temperature, high-pressure gas. This high-temperature, high-pressure gas flows through the outlet of the compressor 10 into the first pipe 51. Since the second valve body 514 is closed and the first valve body 513 is open, the refrigerant in the first pipe 51 can flow into the first inlet of the condenser 20 through the first branch pipe 511. In this way, the condenser 20 exchanges heat with the indoor air, releasing a large amount of heat, raising the water temperature or warming the indoor air. Meanwhile, the refrigerant cools and condenses into a liquid during this process.

[0036] After the refrigerant exchanges heat with the condenser 20 and the indoor air, it releases a large amount of heat and still has a certain amount of residual heat. The refrigerant with residual heat can enter the second pipe 52 through the second inlet, 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 energy storage tank.

[0037] The refrigerant in heat exchange tube 41 is then guided through its outlet to the third pipe 53, and from there through the third pipe 53 to the third inlet before entering the evaporator 30. Once in the evaporator 30, the low-temperature, low-pressure refrigerant absorbs heat from the air again, and this cycle repeats continuously, transferring heat from the air to the room for sustained heating. The absorbed heat then enters the compressor 10 through the fourth inlet, continuing this cycle to heat the room.

[0038] During the heating process, the residual heat in the refrigerant inside the heat exchange tube 41 can continuously exchange heat with the water in the energy storage tank 40, allowing the water temperature in the energy storage tank 40 to 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 tank 40 can be heated to a temperature of approximately 30 to 40 degrees Celsius after exchanging heat with the heat exchange tube 41.

[0039] When the outdoor ambient temperature is low, the outer layer of the outdoor evaporator 30 is prone to frost formation in the low-temperature environment. 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 heat pump's heating capacity to decrease, resulting in a poor indoor heating effect. At this time, the heat pump can start the defrosting action. During defrosting, the first valve body 513 can be closed and the second valve body 514 can be opened. At this time, the refrigerant discharged from the outlet of the compressor 10 can be discharged 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 tank 40, and then enter the third pipe 53 through the outlet end of the heat exchange tube 41. The third pipe 53 guides it to the third inlet of the evaporator 30. At this time, the refrigerant in the evaporator 30 can release heat to defrost the surface of the evaporator 30 because it has absorbed the residual heat in the energy storage tank 40. In this way, during the defrosting action, the refrigerant discharged from the compressor 10 does not need to enter the condenser 20 to absorb the residual heat in the room. It 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 tank 40. This reduces the flow path of the refrigerant during the defrosting process, thus shortening the defrosting flow path and making the defrosting speed faster.

[0040] In addition, the hot water in the energy storage tank 40 is heated by the waste heat of the refrigerant during the heating process, and this waste heat is then used for the defrosting action of the heat pump, which results in higher energy utilization.

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

[0042] More specifically, the heat exchange tube 41 can be installed inside the energy storage water tank 40. That is to say, the heat exchange tube 41 is installed inside the energy storage water tank 40. In this way, the water in the energy storage water tank 40 can cover the outside of the heat exchange tube 41 and fully contact the refrigerant inside the heat exchange tube 41 for heat exchange. This results in higher heat exchange efficiency and the waste heat of the refrigerant can be fully absorbed and utilized.

[0043] Furthermore, the heat exchange tubes 41 are coiled inside the energy storage tank 40. This coiled arrangement increases the heat exchange area within a limited space. Compared to straight tubes, the coiled arrangement increases the length of the heat exchange tubes 41, providing a larger surface area for heat transfer and thus improving the overall heat exchange capacity of the heat exchanger. In addition, the refrigerant needs to constantly change its flow direction as it flows through the coiled heat exchange tubes 41, increasing the turbulence. In turbulent flow, the fluid can better exchange heat with the tube walls of the heat exchange tubes 41, improving the convective heat transfer coefficient and enhancing the heat exchange effect. Consequently, more waste heat can be absorbed by the water in the energy storage tank 40, improving heat storage efficiency.

[0044] Furthermore, the aforementioned piping assembly also includes a third valve body 521, which can be installed on the second pipe 52. To prevent refrigerant remaining in the condenser 20 from flowing into the heat exchange tube 41 during defrosting, in addition to closing the first branch pipe 511 via the first valve body 513, the second pipe 52 can also be closed via the third valve body 521. If the refrigerant remaining in the condenser 20 flows into the heat exchange tube 41 during defrosting, it will combine with the temperature of the refrigerant flowing from the compressor 10 through the second branch pipe 512 to the heat exchange tube 41. This would result in a large temperature difference when the energy storage tank 40 needs heat exchange. Therefore, by closing the third valve body 521, the flow of refrigerant from the condenser 20 into the heat exchange tube 41 in this state can be reduced, thereby lowering the temperature difference of the refrigerant in the heat exchange tube 41 during defrosting and improving defrosting efficiency.

[0045] Further, see Figure 2 The energy storage heat pump structure also includes an oil separation component, which includes an oil separator 60 and a fourth pipe 61. The oil separator 60 has a first inlet, a first outlet and a second outlet. The first inlet is located at the top of the oil separator 60, the first outlet is located at the side of the oil separator 60 and the second outlet is located at the bottom of the oil separator 60. One end of the fourth pipe 61 is connected to the outlet of the compressor 10, and 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] In order to improve the operating performance of the compressor 10, lubricating oil is usually installed in the internal pipeline of the compressor 10 during operation. The lubricating oil flows with the refrigerant during the operation of the compressor 10, reducing the wear caused by friction during high-speed operation. During the operation of the compressor 10, the refrigerant is compressed into high-temperature and high-pressure gas and discharged. In this process, the refrigerant oil will be fully mixed with the refrigerant and discharged from the compressor 10 along with the refrigerant, entering 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. After the refrigerant and lubricating oil are mixed in the compressor 10, they enter the oil separator 60. The refrigerant and lubricating oil will enter the first pipe 51 through the first outlet, and then enter 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 discharged 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, a longer pipe needs to be laid to guide the refrigerant discharged 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 before returning to the compressor 10. This results in a longer oil return path for the compressor 10. Therefore, in this embodiment, the refrigerant entering the oil separator 60 can also be separated from the lubricating oil in the oil-gas mixture discharged from the compressor 10 in the oil separator 60. The separated lubricating oil is then directly returned to the compressor 10 through the second outlet and the fourth pipe 61, thereby realizing the recovery of lubricating oil. This can effectively separate some of the lubricating oil in the refrigerant, improve the oil return efficiency, reduce the amount of lubricating oil entering the heat pump system circulation pipeline, and extend the safe operating time of the compressor 10 in the absence of oil return. This is especially suitable for heat pump structures with long pipelines.

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

[0050] Furthermore, multiple condensers 20 are provided. The first branch pipe 511 is connected to the first inlet of multiple condensers 20 through multiple third branch pipes. The second inlets of multiple condensers 20 are all connected to the second pipe 52. When multiple condensers 20 are provided, the refrigerant discharged from the compressor 10 guided in the first pipe 51 can enter the first branch pipe 511, and then be introduced into different condensers 20 through the multiple third branch pipes of the first branch pipe 511. In this way, heat exchange and heating are carried out at different locations in the room by condensers 20 at different locations, thereby improving heating efficiency. The second inlets of multiple condensers 20 can all be connected to the second pipe 52, through which the refrigerant after releasing heat at different locations can flow back to the heat exchange pipe 41 to exchange heat with the water in the energy storage tank 40.

[0051] Furthermore, the evaporator 30 is equipped 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] Based on this structure, the heat pump includes a main controller. The main controller can preset a defrost temperature value. When the temperature detector of the evaporator 30 detects that the frosting temperature of the evaporator 30 reaches the preset defrost temperature value, the main controller can control the heat pump to start the defrosting process. That is, the main controller can control the compressor 10 to start, the first valve 513 to close, and the second valve 514 to open, initiating the refrigerant defrosting cycle. When the temperature detector of the evaporator 30 detects that the defrost temperature is higher than the preset defrost temperature value, the defrosting process can be stopped, and normal heat pump heating can begin. At this time, the first valve 513 is opened, and the second valve 514 is closed.

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

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

[0055] Furthermore, the aforementioned fourth conduit is connected to the inlet of the vapor-liquid separator via the fifth pipe, and the outlet of the vapor-liquid separator is connected to the inlet of the compressor 10. Since the refrigerant exiting the evaporator 30 may be in a two-phase state (gas and liquid), if it directly enters the compressor 10, the liquid refrigerant entering the compressor 10 may cause liquid slugging, damaging components such as valves and pistons of the compressor 10. Therefore, the refrigerant exiting from the fourth conduit of the evaporator 30 can first be guided to the vapor-liquid separator via the fifth pipe. In the vapor-liquid separator, the liquid refrigerant can be separated and stored, allowing only the gaseous refrigerant to enter the compressor 10, thereby effectively avoiding liquid slugging and extending the service life of the compressor 10.

[0056] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A storage-type heat pump structure, characterized in that... ,include, compressor; A condenser for exchanging heat with indoor air, the condenser having a first inlet and a second inlet; An evaporator for exchanging heat with outdoor air, the evaporator being provided with a third inlet and a fourth inlet; A piping assembly includes a first pipe, a second pipe, a third pipe, a heat exchange tube, a first valve body, and a second valve body. One end of the first pipe is connected to the outlet of the compressor, and the other end of the first pipe is connected to a first branch pipe and a second branch pipe. The first branch pipe is connected to a first through-port, and the second through-port is connected to the inlet end of the heat exchange tube through the second pipe. The outlet end of the heat exchange tube is connected to the third through-port through the third pipe. A fourth through-port is connected to the inlet of the compressor. A first valve body is provided on the first branch pipe, and a second valve body is provided on the second branch pipe. 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 installed inside the energy storage tank.

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

4. The energy storage heat pump structure according to claim 1, characterized in that, The piping assembly also includes a third valve body, which is provided on the second pipe.

5. The energy storage heat pump structure according to claim 1, characterized in that, The energy storage heat pump structure also includes an oil separation component, which further includes an oil separator and a fourth pipe. The oil separator has a first inlet, a first outlet, and a second outlet. The first inlet is located at the top of the oil separator, the first outlet is located on the side of the oil separator, and the second outlet is located at the bottom of the oil separator. One end of the fourth pipe is connected to the outlet of the compressor, and the other end of the fourth pipe is connected to the first inlet. The first pipe is connected to the first outlet, the second outlet is connected to one end of the fourth pipe, and the other end of the fourth pipe 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.

7. The energy storage heat pump structure according to any one of claims 1-6, characterized in that, The condenser is provided in multiple ways, and the first branch pipe is connected to the first conduction port of the multiple condensers through multiple third branch pipes; the second conduction port of the multiple condensers is connected to the second pipe.

8. The energy storage heat pump structure according to any one of claims 1-6, characterized in that, The evaporator is equipped with a temperature detector, which is used to detect the frost 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 1-6, characterized in that, The third pipe is equipped with a throttling device.

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

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