Phase change defrosting device of air source heat pump

Abstract

The utility model provides an air source heat pump phase change defrosting device, and relates to the technical field of heat pump defrosting. The device comprises an evaporator, a compressor, a heat pump shell and a phase change backflow system, the phase change backflow system comprises a heat absorption device, an exchange device and a heat release device, the heat absorption device is arranged at the bottom end in the heat pump shell and connected with the heat pump shell and the compressor, the heat release device is arranged in the evaporator, and the exchange device is communicated with the heat absorption device and the heat release device. The heat absorption device absorbs solar energy and heat emitted when the compressor works, the heat is transferred to the heat release device through the phase change backflow system to release heat, and the evaporator is assisted in defrosting. Through the independent phase change backflow system, the defrosting work of the heat pump is maintained through heat energy of the heat pump and solar energy, an energy system and an induction element do not need to be additionally arranged, disassembly and assembly are flexible, and the improvement cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump defrosting, in particular to an air source heat pump phase change defrosting device. Background Art

[0002] An air source heat pump is a device with efficient and clean energy utilization technology. It absorbs low-temperature heat energy from the air and converts it into high-temperature heat energy, achieving multifunctional applications such as heating, cooling, and hot water supply. With the increasing demand for comfort, energy saving, and safety, air source heat pumps, as a new type of energy-saving equipment, have broad market potential and application prospects. However, air source heat pumps also face some challenges. In actual applications, extreme low temperature environments will reduce the efficiency of air source heat pumps. The performance of air source heat pumps will vary with outdoor climate changes. In cold areas, auxiliary heaters are required to assist in internal defrosting while meeting heat demand. Selecting a suitable air source heat pump system requires considering regional climate characteristics and the specific needs of the building.

[0003] For example, patent publication number CN118242795A discloses an automatic defrosting low-temperature air source heat pump, which heats a serpentine copper tube with hot water, allowing the serpentine copper tube to heat the frost on the evaporator, thereby achieving an automatic defrosting effect.

[0004] However, this method requires providing additional energy for the defrost system and installing other accessory sensors, which does not meet the energy-saving requirements of the auxiliary defrost system. Utility Model Content

[0005] The utility model provides an air source heat pump phase change defrosting device to alleviate the problem in the prior art that additional energy and additional equipment need to be provided to an auxiliary defrosting system.

[0006] In order to alleviate the above technical problems, the technical solution provided by the present invention is:

[0007] The utility model provides an air source heat pump phase change defrosting device, comprising an evaporator, a compressor, a heat pump housing and a phase change reflux system, wherein the phase change reflux system comprises a heat absorption device, an exchange device and a heat release device, the heat absorption device is arranged at the bottom end position in the heat pump housing, and is connected to the heat pump housing and the compressor, the heat release device is arranged inside the evaporator, the exchange device is connected to the heat absorption device and the heat release device, the heat absorption device absorbs solar energy and heat emitted by the compressor during operation, and transfers the heat to the heat release device through the phase change reflux system to release heat, thereby assisting the evaporator in defrosting.

[0008] Furthermore, the heat pump housing is arranged outside the evaporator and the compressor, and a plurality of solar energy absorption panels are arranged around the bottom end of the heat pump housing, and the solar energy absorption panels are connected to the heat absorption device.

[0009] Furthermore, the heat release device includes a plurality of U-shaped copper tubes, which are arranged in an inverted U shape, and the plurality of U-shaped copper tubes are arranged at intervals along the fins of the evaporator.

[0010] Furthermore, the heat absorption device includes a compressor heat absorber and a baffle heat absorber. The compressor heat absorber is connected to the outer shell of the compressor and is used to absorb the heat generated by the compressor. The baffle heat absorber is in contact with the solar absorption panel.

[0011] Furthermore, the exchange device is arranged between the heat release device and the heat absorption device, the upper end of the exchange device is connected to the U-shaped copper tube, and the lower end of the exchange device is connected to the compressor heat absorber and the baffle heat absorber.

[0012] Furthermore, the exchange device includes a branch pipe and a return pipe, the branch pipe includes multiple upper branch pipes and multiple lower branch pipes, the multiple upper branch pipes are connected one-to-one with the interfaces of the multiple U-shaped copper pipes, and are used to receive the reflux liquid refrigerant, part of the interface of the lower branch pipe is connected to the compressor heat absorber, and the other part of the interface of the lower branch pipe is connected to the baffle heat absorber, and the return pipe is connected to the upper branch pipe at the upper end and the lower branch pipe at the lower end.

[0013] Furthermore, thermal insulation materials are provided outside the upper branch pipe and the lower branch pipe.

[0014] Furthermore, the compressor is arranged at the lower end of the evaporator, and the compressor is connected to the evaporator.

[0015] Furthermore, the compressor heat absorber includes a solenoid, an airflow fan and a heat conduction block, wherein the solenoid is arranged outside the heat conduction block; and the airflow fan is arranged inside the solenoid pipe.

[0016] The beneficial effects of the air source heat pump phase change defrosting device in this utility model are analyzed as follows:

[0017] The utility model discloses an air source heat pump phase change defrosting device, comprising an evaporator, a compressor, a heat pump housing and a phase change reflux system, wherein the phase change reflux system comprises a heat absorption device, an exchange device and a heat release device, the heat absorption device is arranged at the bottom end position in the heat pump housing, and is connected to the heat pump housing and the compressor, the heat release device is arranged inside the evaporator, the exchange device is connected to the heat absorption device and the heat release device, the heat absorption device absorbs solar energy and heat emitted by the compressor when working, and transfers the heat to the heat release device through the phase change reflux system to release heat, thereby assisting the evaporator in defrosting.

[0018] The phase-change reflux system is filled with refrigerant. Heat from the compressor casing and solar energy is first transferred to the refrigerant within the system. The refrigerant vaporizes and rises to the evaporator, releasing heat to defrost the evaporator. After releasing heat, the refrigerant transforms into a liquid state and, under the influence of gravity, flows along the return pipe to the heat sink below, where it continues its gas-liquid transformation.

[0019] First, the device utilizes its own thermal energy and solar energy to maintain defrosting of the heat pump, eliminating the need for additional energy systems and sensing components. Second, the phase-change reflux system is independent of the evaporator and compressor, making it possible to retrofit the existing evaporator and compressor without requiring modifications, resulting in low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of an air source heat pump phase change defrosting device provided in an embodiment of the utility model;

[0022] Figure 2 A schematic structural diagram of an air source heat pump provided by an embodiment of the utility model;

[0023] Figure 3 A schematic structural diagram of a phase change reflux system provided in an embodiment of the present utility model;

[0024] Figure 4 A schematic top view of the structure of an air source heat pump phase change defrosting device provided in an embodiment of the utility model;

[0025] Figure 5 A schematic structural diagram of a compressor heat absorber provided in an embodiment of the utility model.

[0026] Icons: 110-evaporator; 120-compressor; 130-heat pump housing; 200-phase change reflux system; 210-heat absorption device; 220-exchange device; 230-heat release device; 131-solar absorption panel; 211-compressor heat absorber; 212-baffle heat absorber; 221-return pipe; 222-upper branch pipe; 223-lower branch pipe; 231-U-shaped copper tube; 2111-solenoid; 2112-air flow fan; 2113-heat conduction block. DETAILED DESCRIPTION

[0027] This embodiment provides an air source heat pump phase change defrosting device, please refer to Figure 1-Figure 5 The device includes an evaporator 110, a compressor 120, a heat pump housing 130 and a phase change reflux system 200. The phase change reflux system 200 includes a heat absorption device 210, an exchange device 220 and a heat release device 230. The heat absorption device 210 is arranged at the bottom end of the heat pump housing 130 and is connected to the heat pump housing 130 and the compressor 120. The heat release device 230 is arranged inside the evaporator 110. The exchange device 220 connects the heat absorption device 210 and the heat release device 230. The heat absorption device 210 absorbs solar energy and heat emitted by the compressor 120 during operation, and transfers the heat to the heat release device 230 through the phase change reflux system 200 to release heat, thereby assisting the evaporator 110 in defrosting.

[0028] During operation, the phase-change recirculation system 200 is filled with refrigerant. Heat from the compressor 120 casing and solar energy is first transferred to the refrigerant within the phase-change recirculation system 100. The refrigerant vaporizes due to the heat and rises to the evaporator 110. The vaporized refrigerant releases heat, thereby defrosting the evaporator 110. After releasing heat, the refrigerant transforms into a liquid state and, under the action of gravity, flows along the return pipe 221 to the heat sink 210 below, where it continues its gas-liquid transformation.

[0029] First, the device utilizes its own thermal energy and solar energy to maintain defrosting of the heat pump, eliminating the need for additional energy systems and sensing components. Second, the phase-change reflux system 200 is independent of the evaporator 110 and compressor 120. Therefore, the original evaporator 110 and compressor 120 can be retrofitted with the phase-change reflux system 200, resulting in low modification costs.

[0030] To ensure the air-source heat pump meets basic structural requirements, an optional frame is provided for the phase change reflow system 200. The heat pump housing 130 is disposed outside the evaporator 110 and compressor 120. A plurality of solar absorption panels 131 are disposed around the bottom of the heat pump housing 130 and connected to the heat absorption device 210.

[0031] The heat pump housing 130 is an important component of the heat pump equipment. The heat pump housing 130 plays the role of protecting the internal components. This device involves the appearance and overall structure of the heat pump. The overall housing adopts a welded structure with baffles on each side; an integral frame structure can also be adopted. The heat pump housing 130 is usually made of sheet metal, such as galvanized sheet or stainless steel. These materials have good corrosion resistance and structural stability. On each exposed surface of the bottom of the heat pump housing 130, there is a solar absorption panel 131 with a high absorption ratio and good heat transfer performance. The panels are connected in parallel. The solar absorption panel 131 is a key component connected to the heat absorption device 210. Its surface is usually coated with a dark solar absorption coating. The material selection is diverse, including copper, aluminum alloy, copper-aluminum composite material, stainless steel, galvanized steel, plastic and rubber.

[0032] In an optional solution of this embodiment, more preferably, the heat release device 230 includes a plurality of U-shaped copper tubes 231 , which are arranged in an inverted U shape, and the plurality of U-shaped copper tubes 231 are arranged at intervals along the fins of the evaporator 110 .

[0033] The heat release device 230 is composed of multiple U-shaped copper tubes 231. Their precisely curved shape helps improve system performance and efficiency, and the copper tubes provide excellent thermal conductivity when used as pathways for heat transfer between fluids. The entire heat release device 230 is surrounded by the evaporator 110, with the U-shaped copper tubes 231 inserted into the rectangular fins of the evaporator 110. This interlocking structure provides a large contact area within a limited space. Combined with the inherent characteristics of the U-shaped copper tubes 231 and the rectangular fins, this structure provides an effective heat exchange area within a relatively limited space.

[0034] In the optional scheme of this embodiment, it is more preferred that the heat absorption device 210 includes a compressor heat absorber 211 and a baffle heat absorber 212. The compressor heat absorber 211 is connected to the outer shell of the compressor 120 and is used to absorb the heat generated by the compressor 120. The baffle heat absorber 212 is in contact with the solar absorption panel 131.

[0035] During the operation of the compressor 120, the reciprocating motion of the piston in the cylinder or the rotation of the rotating parts inevitably generates excess heat, part of which is transferred to the outer shell of the compressor 120 and collected by the heat absorption device 210. The waste heat of the heat pump itself is used to make the heat medium undergo phase change. In this process, a special compressor heat absorber 211 is used to collect this heat. The special internal structure of the compressor heat absorber 211 can concentrate the heat distributed throughout the outer shell of the compressor 120 into the compressor heat absorber 211, and the interior of the compressor heat absorber 211 is directly connected to the phase change reflux system 200, and the vaporized heat medium After absorbing heat in the compressor heat absorber 211, the heat is directly transferred to the heat release device 230 through the pipeline; the baffle heat absorber 212 has the same function as the compressor heat absorber 211. The baffle heat absorber 212 is connected to the solar absorption panel 131 through the terminal reserved between the contact surface of the solar absorption panel 131 and the heat pump housing 130. The solar energy collected is converted into electrical energy, and then the electrical energy is converted into heat energy through the internal heating device of the baffle heat absorber 212 to be provided to the heat medium. The connection method here can also be designed to be connected to an infrared electric heating panel, but both methods may cause the solar heat transfer to be impaired.

[0036] In the optional scheme of this embodiment, it is more preferred that the exchange device 220 is arranged between the heat release device 230 and the heat absorption device 210, the upper end of the exchange device 220 is connected to the U-shaped copper tube 231, and the lower end of the exchange device 220 is connected to the compressor heat absorber 211 and the baffle heat absorber 212.

[0037] The heat medium gas passes through the exchange device 220 and reaches the heat release device 230. After the heat release device 230 releases energy for defrosting, it undergoes a secondary phase change and flows back into the exchange device 220. It then returns to the heat absorption device 210 along the exchange device 220. Gas and liquid mix in the entire phase change reflux system 200. As a path connecting the exchange device 220 and the heat absorption device 210, the exchange device 220 not only takes into account the functions of rectification and reflux, but also prevents gas leakage and pipeline corrosion when transporting heat medium. At each interface position of the exchange device 220, an airtight connection is adopted, with retaining rings and sealing rings installed at the pipe openings. The connection with the U-shaped copper tube 231 adopts the form of the lower pipe opening wrapped around the upper pipe opening. A multi-layer anti-corrosion structure is used at the pipe opening and inside the connecting pipe of the exchange device 220. The pipe diameter should not be too small to prevent expansion and cracking when the heat medium gas passes through the branch pipe quickly.

[0038] In the optional scheme of this embodiment, it is more preferred that the exchange device 220 includes a branch pipe and a return pipe 221, the branch pipe includes multiple upper branch pipes 222 and multiple lower branch pipes 223, the multiple upper branch pipes 222 are connected to the interfaces of multiple U-shaped copper tubes 231 in a one-to-one correspondence, and are used to receive the reflux liquid refrigerant, part of the interface of the lower branch pipe 223 is connected to the compressor heat absorber 211, and the other part of the interface of the lower branch pipe 223 is connected to the baffle heat absorber 212, and the return pipe 221 is connected to the upper branch pipe 222 at the upper end and the lower branch pipe 223 at the lower end.

[0039] In the exchange device 220, the main function of the return pipe 221 is to collect the liquid heat medium that returns after the heat exchange is completed. In the system design, the size, shape and position of the return pipe 221 need to be carefully considered to ensure the optimal performance and reliability of the system. The return pipe 221 can be a simple pipe or a pipe with a special design, such as a serpentine pipe or a spiral pipe, to increase the surface area and improve the heat exchange performance. In some systems, the return pipe 221 may be used in combination with a liquid reservoir or a gas-liquid separator to further improve the efficiency and stability of the system. In order to ensure its certain thermal conductivity, some interlayers or thermal insulation materials with good thermal insulation performance also need to be set on the outside of the return pipe 221.

[0040] In the exchange device 220, the upper branch pipe 222 is connected to the pipe mouth connection of the U-shaped copper pipe 231. In this embodiment, the copper pipe connection is welded. Without limiting other conditions, bolts and nuts can be used to connect the two flanges together, and a gasket (such as a rubber gasket, a metal gasket or an asbestos gasket) is used in the middle to achieve sealing. Thread sealing tape or pipe sealant, such as polytetrafluoroethylene (PTFE) tape or liquid pipe sealant, can also be used to wrap or apply it on the thread to prevent leakage. At the same time, as a common method of pipe mouth sealing, O-rings, rectangular rings or other shapes can be used to fill the gap at the pipe connection to prevent leakage. In order to reduce the heat loss of the gaseous high-temperature heat medium, an insulation material is provided on the outside of the lower branch pipe 223.

[0041] The basic structure of an air-source heat pump consists of a compressor 120 located below and connected to the evaporator 110. Compressor 120 compresses the gas by reducing its volume to increase its pressure. Available compressor types include piston reciprocating compressors and screw rotary compressors. During operation, compressor 120 generates excess heat, which is dissipated into the outer casing. The evaporator 110 typically consists of heat transfer tubes, fins, end caps, brackets, and an inlet and outlet. The design and selection of evaporator 110 depend on the specific application requirements, the type of cooling medium, the required cooling capacity, and the overall system design. Compressor 120 is connected solely to evaporator 110 and is independent of the phase-change recirculation system 200. Therefore, the phase-change recirculation system 200, acting as an auxiliary defrost system, is not included in the heat pump's operation. However, when compressor 120 is operating, the phase-change recirculation system 200 assists in defrosting only when it receives excess energy. Furthermore, the compressor 120 and evaporator 110 within the heat pump have their own self-defrosting logic.

[0042] In the optional scheme of this embodiment, more preferably, the compressor heat absorber 211 includes a solenoid 2111, an air flow fan 2112 and a heat conductive block 2113, the solenoid 2111 is arranged outside the heat conductive block 2113; the air flow fan 2112 is arranged in the pipe of the solenoid 2111.

[0043] The spirals of the solenoid 2111 are arranged in a closed manner with the gaps as narrow as possible, tightly fitting and wrapping the heat-conducting block 2113, so that the heat medium can fully absorb heat in the solenoid 2111. Due to its unique spiral structure, it can accommodate more heat medium for full heating compared to the general straight-up and straight-down heat-conducting copper tubes. The heat-conducting block 2113 has excellent thermal conductivity. Due to the characteristics of heat transfer, the waste heat dispersed from the compressor 120 casing is concentrated on the heat-conducting block 2113. The heated and vaporized heat medium drives the blades to rotate through the air flow fan 2112, forming a vortex that is continuously guided upward, and the high-temperature gas inside the solenoid 2111 is extracted. Because the cavity and the liquefied heat medium are affected by gravity, the gas-liquid exchange and heat exchange are continuously accelerated.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An air source heat pump phase change defrosting device, characterized by: It includes an evaporator (110), a compressor (120), a heat pump housing (130) and a phase change reflux system (200); The phase change reflux system (200) includes a heat absorption device (210), an exchange device (220) and a heat release device (230); The heat absorbing device (210) is arranged at the bottom end of the heat pump housing (130) and is connected to the heat pump housing (130) and the compressor (120). The heat releasing device (230) is arranged inside the evaporator (110). The exchange device (220) is connected to the heat absorbing device (210) and the heat releasing device (230). The heat absorbing device (210) absorbs heat from the heat pump housing (130) and the compressor (120) and transfers the heat to the heat releasing device (230) through the phase change reflux system (200) to release heat, thereby assisting the evaporator (110) in defrosting.

2. The air source heat pump phase change defrosting device according to claim 1, characterized in that: The heat pump housing (130) is arranged outside the evaporator (110) and the compressor (120); A plurality of solar energy absorption panels (131) are arranged around the bottom end of the heat pump housing (130); The solar energy absorption panel (131) is connected to the heat absorption device (210).

3. The air source heat pump phase change defrosting device according to claim 2, characterized in that: The heat release device (230) comprises a plurality of U-shaped copper tubes (231), the U-shaped copper tubes (231) being arranged in an inverted U shape, and the plurality of U-shaped copper tubes (231) being arranged at intervals along the fins of the evaporator (110).

4. The air source heat pump phase change defrosting device according to claim 3, characterized in that: The heat absorption device (210) includes a compressor heat absorber (211) and a baffle heat absorber (212); The compressor heat absorber (211) is connected to the outer shell of the compressor (120) and is used to absorb heat generated by the compressor (120); The baffle heat absorber (212) is in contact with the solar absorption panel (131).

5. The air source heat pump phase change defrosting device according to claim 4, characterized in that: The exchange device (220) is arranged between the heat release device (230) and the heat absorption device (210); the upper end of the exchange device (220) is connected to the U-shaped copper tube (231); and the lower end of the exchange device (220) is connected to the compressor heat absorber (211) and the baffle heat absorber (212).

6. The air source heat pump phase change defrosting device according to claim 5, characterized in that: The exchange device (220) includes a branch pipe and a return pipe (221); The branch pipes include a plurality of upper branch pipes (222) and a plurality of lower branch pipes (223); The plurality of upper branch pipes (222) are connected to the interfaces of the plurality of U-shaped copper pipes (231) in a one-to-one correspondence, and are used to receive the reflux liquid refrigerant; A portion of the lower branch pipe (223) is connected to the compressor heat absorber (211), and another portion of the lower branch pipe (223) is connected to the baffle heat absorber (212). The return pipe (221) is connected to the upper branch pipe (222) at the upper end and the lower branch pipe (223) at the lower end.

7. The air source heat pump phase change defrosting device according to claim 6, characterized in that: The upper branch pipe (222) and the lower branch pipe (223) are both provided with heat-insulating materials.

8. The air source heat pump phase change defrosting device according to claim 7, characterized in that: The compressor (120) is arranged at the lower end of the evaporator (110), and the compressor (120) is connected to the evaporator (110).

9. The air source heat pump phase change defrosting device according to claim 8, characterized in that: The compressor heat absorber (211) includes a solenoid (2111), an air flow fan (2112) and a heat conduction block (2113); The solenoid (2111) is arranged outside the heat-conducting block (2113); and the airflow fan (2112) is arranged inside the solenoid (2111) pipe.

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