Combined heat exchanger matched with crude oil heating heat pump device

Abstract

The invention discloses a combined heat exchanger matched with a crude oil heating heat pump device, and belongs to the field of heat pumps and heat exchange. The combined heat exchanger comprises a condenser, a wrapping type flexible electric heating component and a phase change heat storage component. The wrapped flexible electric heating component is wrapped outside the condenser, the wrapped flexible electric heating component is connected with the power supply, and the condenser comprises a refrigerant channel and a crude oil channel; the phase change heat storage component comprises a refrigerant channel and a crude oil channel; a refrigerant channel of the condenser is communicated with a refrigerant channel of the phase change heat storage component; and the condenser crude oil channel is communicated with the phase change heat storage component crude oil channel. The three-in-one integrated design of the condenser, the wrapping type flexible electric heating component and the phase change heat storage component is adopted, multiple functions are integrated, the overall structure is greatly simplified, and remarkable technical advantages are shown in the aspects of heat exchange efficiency, anti-scaling treatment, system defrosting, energy efficiency improvement and the like.

Description

Technical Field

[0001] This invention belongs to the field of heat pump and heat exchange technology, specifically relating to a combined heat exchanger for use with a crude oil heating heat pump device. Background Technology

[0002] Crude oil extracted from many oilfields in China generally has a high wax content and a high pour point. Especially in northern winters, during the transportation of crude oil from well sites, the temperature of the crude oil drops rapidly due to the heat dissipation of the pipelines. This causes wax, gum, asphalt, sand particles, and other mechanical impurities in the crude oil to deposit on the inner wall of the pipeline, forming a wax deposit phenomenon that seriously affects the safety and transport capacity of the pipeline. Therefore, in northern oilfields, it is usually necessary to heat the produced fluid before transportation in winter.

[0003] Among various technical solutions for heating crude oil at well sites, air source heat pump heating devices are a relatively new technology that offers significant energy-saving and environmental advantages compared to other heating technologies. Air source heat pumps are widely used in domestic hot water production and heating, but their application in heating produced fluids at well sites requires addressing specific needs related to crude oil heating. For example, well sites are often located in harsh climates with extreme low temperatures, leading to insufficient compressor heating, necessitating additional heat sources. Furthermore, crude oil requires continuous heating throughout the winter, while air source heat pumps often need to stop heating due to defrosting issues, requiring auxiliary heating methods to provide heat.

[0004] For defrosting issues in air source heat pumps, the fastest and most commonly used method is to employ reverse operation technology using a four-way valve, but this requires providing the heat needed for defrosting. Simultaneously, crude oil heating cannot be interrupted during system defrosting, thus requiring an additional heat supply for crude oil heating. To address this problem, a phase change heat storage medium can be used. During normal system operation, it accumulates some heat for defrosting and provides a partial heat source for crude oil heating during defrosting. The remaining heat supply gap during defrosting can be compensated for by electric heating.

[0005] Achieving efficient, coupled, and synergistic heat exchange among the refrigerant, crude oil, heat storage medium, and electric heating device during the condensation process in a crude oil heating heat pump unit is a major challenge in crude oil heat exchanger design. Ingeniously coupling and integrating these functions is the prerequisite and foundation for ensuring the efficient, compact, safe, and reliable operation of the heat pump unit. Therefore, in the design of crude oil heating heat pump units, special attention must be paid to the synergistic effect between these functions to achieve optimal heat exchange performance. Summary of the Invention

[0006] The purpose of this invention is to provide a combined heat exchanger for a crude oil heating heat pump device, so as to meet the problem of stable heat supply and matching in the normal and defrost working modes of the heat pump system, solve the problems of difficult heat transfer in multiple modes during defrost in crude oil heating heat pump devices, and the difficulty in realizing the coupling design of multi-media crude oil heat exchangers, and ensure the stable, safe, efficient and reliable operation of the heat pump system.

[0007] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a combined heat exchanger for a crude oil heating heat pump device, comprising a condenser, a wrap-around flexible electric heating component, and a phase change heat storage component. The flexible electric heating element is wrapped around the outside of the condenser and is connected to the power supply. The condenser includes a refrigerant channel and a crude oil channel. The phase change heat storage element includes a refrigerant channel and a crude oil channel. The refrigerant channel of the condenser is connected to the refrigerant channel of the phase change heat storage element. The crude oil channel of the condenser is connected to the crude oil channel of the phase change heat storage element.

[0008] The refrigerant passage of the condenser includes several inner tubes arranged in parallel. Adjacent inner tubes are connected by elbows, which are alternately arranged at both ends of the inner tubes. Each connection between the elbow and the inner tube is equipped with a connecting pipe and a sealing gasket. One end of the refrigerant passage of the condenser is the first refrigerant inlet, and the other end is the first refrigerant outlet. The first refrigerant inlet is connected to the refrigerant passage of the phase change heat storage component, and the first refrigerant outlet is connected to an external refrigerant pipeline.

[0009] The crude oil passage of the condenser includes a sleeve, and the inner tube is sleeved on the outside of the sleeve. Both ends of the sleeve are coaxially equipped with sealing plates. Adjacent sleeves are connected by pipes arranged alternately near the two ends of the sleeve. A first discharge pipe is set at one end of the sleeve near the first refrigerant inlet, and a first feed pipe is set at one end of the sleeve near the first refrigerant outlet. The first discharge pipe is connected to the crude oil passage of the phase change heat storage component through a pipe, and the first feed pipe is connected to an external crude oil pipeline.

[0010] The inner surface of the sleeve, the inner tube, and the outer surface of the elbow are all treated with a water-repellent coating.

[0011] The crude oil channel of the phase change heat storage component includes a second spiral tube, one end of which is connected to a second feed pipe and the other end of which is connected to a second discharge pipe; the second feed pipe is connected to the first discharge pipe of the refrigerant condenser and the second discharge pipe is connected to an external crude oil pipeline.

[0012] The refrigerant channel of the phase change heat storage component includes a first spiral tube, one end of which is connected to a second refrigerant inlet and the other end of which is connected to a second refrigerant outlet. The second refrigerant outlet is connected to the first refrigerant inlet of the condenser, and the second refrigerant inlet is connected to an external refrigerant pipeline.

[0013] The first and second spiral tubes are intertwined and simultaneously placed within a cylindrical cavity formed by the inner and outer sleeves, where phase change heat storage material is stored.

[0014] Both the outer side of the outer sleeve and the inner side of the inner sleeve are wrapped with insulation layers. The encapsulated flexible electric heating component includes a heating layer with current-carrying electrodes at both ends; the heating layer is covered with a waterproof layer, and the waterproof layer is covered with an insulating layer; the current-carrying electrodes are connected to a power source.

[0015] The heating layer is a graphene electric heating film.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The combined heat exchanger for the crude oil heating heat pump device provided by this invention adopts an integrated design that combines a condenser, a wrap-around flexible electric heating component, and a phase change heat storage component into one unit. This integrates multiple functions into one, significantly simplifying the overall structure and effectively improving the overall performance and practicality of the equipment. The condenser, as the core component of heat exchange, ensures efficient heat transfer between the refrigerant and crude oil. The introduction of the wrap-around flexible electric heating component provides a powerful supplement to the heat demand of the equipment under extreme low-temperature conditions and when the compressor fails. This component not only enhances the reliability of the equipment and ensures stable operation in various harsh environments, but also provides an additional heat source during system defrosting, accelerating the defrosting speed and improving overall operating efficiency. The phase change heat storage component improves the energy efficiency of the heat pump. During normal operation of the heat pump, this component can accumulate a portion of heat and release it when the system needs defrosting, effectively avoiding heat loss due to defrosting and further improving the overall energy efficiency of the heat pump.

[0017] Furthermore, by applying a professional hydrophobic coating to the inner surface of the crude oil passage in the condenser, the problems of scale and fouling that may occur during heat exchange are effectively solved, thereby further extending the service life of the equipment and improving heat exchange efficiency.

[0018] The combined heat exchanger for the crude oil heating heat pump device of the present invention integrates multiple functions and demonstrates significant technical advantages and beneficial effects in terms of heat exchange efficiency, defrosting and energy efficiency improvement, bringing a brand-new solution and breakthrough to the field of heat pumps and heat exchange. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a schematic diagram of the combined heat exchanger used in conjunction with the crude oil heating heat pump device of the present invention.

[0020] Figure 2 This is a schematic diagram of the condenser in the combined heat exchanger used with the crude oil heating heat pump device of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the enclosed flexible electric heating component in the combined heat exchanger used in the crude oil heating heat pump device of the present invention.

[0022] Figure 4 A schematic diagram of the phase change heat storage component in the combined heat exchanger used with the crude oil heating heat pump device of the present invention. The components include: 1. Condenser; 2. Wrapped flexible electric heating element; 3. Phase change heat storage element; 101. Inner tube; 102. Sleeve; 103. Sealing plate; 104. Connecting pipe; 105. Elbow; 106. First refrigerant inlet; 107. First refrigerant outlet; 108. First feed pipe; 109. First discharge pipe; 201. Heating layer; 202. Current-carrying electrode; 203. Waterproof layer; 204. Insulation layer; 301. First spiral tube; 302. Second spiral tube; 303. Inner sleeve; 304. Outer sleeve; 305. Insulation layer; 306. Second refrigerant inlet; 307. Second refrigerant outlet; 308. Second feed pipe; 309. Second discharge pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of the embodiments of the present invention, it should be noted that the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of the invention is in use. These are merely 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 orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0029] The present invention will now be described in further detail with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the crude oil heating heat pump device of the present invention uses a combined heat exchanger, which includes a condenser 1, a wrap-around flexible electric heating component 2, and a phase change heat storage component 3. The wrap-around flexible electric heating component 2 is wrapped around the outside of the condenser 1 and is connected to a power source; the condenser 1 is connected to the phase change heat storage component 3 through a pipe.

[0031] like Figure 2As shown, condenser 1 is a shell-and-tube heat exchanger, including a refrigerant passage and a crude oil passage. The refrigerant passage of condenser 1 includes several inner tubes 101 arranged in parallel. Adjacent inner tubes 101 are connected by elbows 105, which are U-shaped elbows. Elbows 105 are alternately arranged at both ends of the inner tubes 101. Each connection between the elbow 105 and the inner tube 101 is provided with a connecting pipe 104 and a sealing gasket. The crude oil passage of condenser 1 includes a sleeve 102, which is located outside the inner tubes 101. Each sleeve 102 is fitted with a casing 102, and sealing plates 103 are coaxially installed at both ends of the casing 102. Adjacent casings 102 are connected by pipes arranged alternately near both ends of the casing 1. One end of the refrigerant passage of the condenser 1 is the first refrigerant inlet 106, and the end of the casing 102 near the first refrigerant inlet 106 is provided with a first discharge pipe 109. The other end of the refrigerant passage of the condenser 1 is the first refrigerant outlet 107. The end of the casing 102 near the first refrigerant outlet 107 is provided with a first feed pipe 108. The first refrigerant inlet 106 is connected to the phase change heat storage component 3 through a pipe, the first refrigerant outlet 107 is connected to an external refrigerant pipe, the first discharge pipe 109 is connected to the phase change heat storage component 3 through a pipe, and the first feed pipe 108 is connected to an external crude oil pipe.

[0032] The crude oil channel is wrapped around the refrigerant channel. The refrigerant flows inside the inner pipe 101, while the crude oil flows between the casing 102 and the inner pipe 101, with the refrigerant and crude oil in counter-current contact. This counter-current contact between the refrigerant and crude oil allows for a larger contact area, improving heat exchange efficiency and achieving a highly efficient, stable, easy-to-maintain, and controllable heat exchange process.

[0033] In some embodiments, the inner surface of the sleeve 102, the inner pipe 101, and the outer surface of the elbow 105 are all treated with a hydrophobic coating. Hydrophobic treatment of the pipe surface prevents impurities from depositing on the pipe surface, avoids wax buildup, ensures smooth pipe flow, and also prevents corrosion and extends the pipe's service life.

[0034] like Figure 3 As shown, the flexible encapsulated electric heating component 2 is wrapped around the outside of the condenser 1. The flexible encapsulated electric heating component 2 includes a heating layer 201, with current-carrying electrodes 202 at both ends of the heating layer 201. The heating layer 201 is covered with a waterproof layer 203, and the waterproof layer 203 is covered with an insulating layer 204. Energy is provided to the current-carrying electrodes 202 through a power supply connection. The heating layer 201 is a novel flexible graphene electric heating film with high heat flux density. The heating temperature of the graphene electric heating film is 85-95℃.

[0035] The encapsulated flexible electric heating element ensures stable equipment operation, providing timely energy replenishment under extreme low-temperature conditions and in case of equipment failure. Waterproof and insulating layers enhance the durability and safety of the heating element. The graphene heating film exhibits excellent electrothermal conversion efficiency, efficiently converting electrical energy into heat energy and reducing energy waste. The graphene electric heating film has a heating temperature of 85-95℃, a suitable temperature range that meets heat exchange requirements while avoiding excessive energy consumption and environmental pollution. The encapsulated flexible electric heating element can be installed on the exterior of condensers of different sizes, offering high adaptability.

[0036] like Figure 4 As shown, the phase change heat storage component 3 is a double spiral coil sleeve heat exchanger; the phase change heat storage component 3 includes a refrigerant channel and an oil channel; the refrigerant channel of the phase change heat storage component 3 includes a first spiral tube 301, one end of the first spiral tube 301 is connected to the second refrigerant inlet 306, and the other end is connected to the second refrigerant outlet 307, the second refrigerant outlet 307 is connected to the first refrigerant inlet 106 of the condenser, and the second refrigerant inlet 306 is connected to an external refrigerant pipeline; the oil channel of the phase change heat storage component 3 includes a second spiral tube 302, one end of the second spiral tube 302 is connected to the second feed pipe 308, and the other end is connected to the second discharge pipe 309; the second feed pipe 308 is connected to the first discharge pipe 109 of the refrigerant condenser 1, and the second discharge pipe 309 is connected to an external oil pipeline. The first spiral tube 301 and the second spiral tube 302 are intertwined and simultaneously disposed within a cylindrical cavity formed by the inner sleeve 303 and the outer sleeve 304, where phase change heat storage material is stored.

[0037] The phase change heat storage component 3 is designed as a double spiral coil, which increases the heat exchange area, allowing the refrigerant and crude oil to exchange heat more fully with the phase change heat storage material as they flow through the spiral coil, thus improving heat exchange efficiency. During normal heat pump operation, the phase change heat storage component can store some heat. When the heat pump system needs defrosting, the stored heat is released, providing additional heat for defrosting and effectively improving the overall energy efficiency of the heat pump system. The introduction of the phase change heat storage component gives the heat pump system a stronger ability to cope with emergencies such as defrosting, improving system stability.

[0038] In some embodiments, an insulation layer 305 is wrapped around the outer side of the outer sleeve 304 and the inner side of the inner sleeve 303. The insulation layer can reduce the loss of accumulated heat and maintain the effect of heat accumulation.

[0039] In some embodiments, the phase change thermal storage material is a mixture of sodium sulfate decahydrate and sodium phosphate dodecahydrate, or other thermal storage media with similar melting points. Phase change thermal storage materials can store and release heat within a specific temperature range, effectively utilizing the system's energy and improving the overall efficiency of the heat pump.

[0040] In some embodiments, the combined heat exchanger provided by the present invention adopts an integrated skid-mounted design, in which all the above-mentioned components are integrated into a single skid. The integrated design simplifies the overall structure of the combined heat exchanger and improves the flexibility of application.

[0041] Example 1 The crude oil heating heat pump device in this embodiment uses a combined heat exchanger, including a condenser 1, a wrap-around flexible electric heating component 2, and a phase change heat storage component 3. The wrap-around flexible electric heating component 2 is wrapped around the outside of the condenser 1 and is connected to a power source; the condenser 1 is connected to the phase change heat storage component 3 through a pipe.

[0042] Condenser 1 is a shell-and-tube heat exchanger, comprising a refrigerant passage and a crude oil passage. The refrigerant passage of condenser 1 includes four inner tubes 101, which are arranged parallel in the vertical direction. Adjacent inner tubes 101 are connected by U-shaped elbows 105 at their ends. The elbows 105 are alternately arranged at both ends of the inner tubes 101, and each connection between the elbow 105 and the inner tube 101 is provided with a connecting pipe 104 and a sealing gasket. The crude oil passage of condenser 1 includes a sleeve 102, which covers the outside of the inner tubes 101. The condenser 1 has a sleeve 102, with sealing plates 103 coaxially mounted at both ends. Adjacent sleeves 102 are connected by pipes arranged alternately near both ends of the sleeve 1. One end of the refrigerant passage of the condenser 1 is a first refrigerant inlet 106, and a first discharge pipe 109 is provided at one end of the sleeve 102 near the first refrigerant inlet 106. The other end of the refrigerant passage of the condenser 1 is a first refrigerant outlet 107. A first feed pipe 108 is provided at one end of the sleeve 102 near the first refrigerant outlet 107. The first refrigerant inlet 106 is connected to the phase change heat storage component 3 via a pipe, the first refrigerant outlet 107 is connected to an external refrigerant pipe, the first discharge pipe 109 is connected to the phase change heat storage component 3 via a pipe, and the first feed pipe 108 is connected to an external crude oil pipe. The inner surface of the sleeve 102, the outer surface of the inner pipe 101, and the elbow 105 are all treated with a hydrophobic coating.

[0043] A flexible, enclosed electric heating component 2 is wrapped around the outside of the condenser 1. The flexible electric heating component 2 includes a heating layer 201, with current-carrying electrodes 202 at both ends. The heating layer 201 is covered by a waterproof layer 203, and the waterproof layer 203 is covered by an insulating layer 204. Energy is provided to the current-carrying electrodes 202 via a power supply. The heating layer 201 is a novel flexible graphene electric heating film with high heat flux density; the heating temperature of the graphene electric heating film is 85-95℃.

[0044] The phase change heat storage component 3 is a double spiral coil sleeve heat exchanger. The phase change heat storage component 3 includes a refrigerant channel and a crude oil channel. The refrigerant channel of the phase change heat storage component 3 includes a first spiral tube 301, one end of which is connected to a second refrigerant inlet 306, and the other end is connected to a second refrigerant outlet 307. The second refrigerant outlet 307 is connected to the first refrigerant inlet 106 of the condenser, and the second refrigerant inlet 306 is connected to an external refrigerant pipeline. The crude oil channel of the phase change heat storage component 3 includes a second spiral tube 302, one end of which is connected to a second feed pipe 308, and the other end is connected to a second discharge pipe 309. The second feed pipe 308 is connected to the first discharge pipe 109 of the refrigerant condenser 1, and the second discharge pipe 309 is connected to an external crude oil pipeline. The first spiral tube 301 and the second spiral tube 302 are intertwined and simultaneously disposed within a cylindrical cavity formed by the inner sleeve 303 and the outer sleeve 304, where the phase change heat storage material is stored. The outer sleeve 304 and the inner sleeve 303 are wrapped with an insulation layer 305. The phase change heat storage material is a mixture of sodium sulfate decahydrate and sodium phosphate dodecahydrate.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still make modifications or equivalent substitutions to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the protection scope of the claims of the present invention pending approval.

Claims

1. A combined heat exchanger for use with a crude oil heating heat pump device, characterized in that, Includes a condenser (1), a wrap-around flexible electric heating component (2), and a phase change heat storage component (3); The enclosed flexible electric heating component (2) is wrapped around the outside of the condenser (1). The enclosed flexible electric heating component (2) is connected to the power supply. The condenser (1) includes a refrigerant channel and an oil channel. The phase change heat storage component (3) includes a refrigerant channel and an oil channel. The refrigerant channel of the condenser (1) is connected to the refrigerant channel of the phase change heat storage component (3). The oil channel of the condenser (1) is connected to the oil channel of the phase change heat storage component (3).

2. The combined heat exchanger for a crude oil heating heat pump device according to claim 1, characterized in that, The refrigerant passage of the condenser (1) includes several inner tubes (101), which are arranged in parallel. Adjacent inner tubes (101) are connected by elbows (105). Elbows (105) are alternately arranged at both ends of the inner tubes (101). A connecting pipe (104) and a sealing gasket are provided at the connection between the elbow (105) and the inner tube (101). One end of the refrigerant passage of the condenser (1) is the first refrigerant inlet (106), and the other end of the refrigerant passage of the condenser (1) is the first refrigerant outlet (107). The first refrigerant inlet (106) is connected to the refrigerant passage of the phase change heat storage component (3), and the first refrigerant outlet (107) is connected to the external refrigerant pipeline.

3. The combined heat exchanger for a crude oil heating heat pump device according to claim 2, characterized in that, The crude oil passage of the condenser (1) includes a sleeve (102). The inner tube (101) is fitted with a sleeve (102) on the outside. Both ends of the sleeve (102) are coaxially fitted with sealing plates (103). Adjacent sleeves (102) are connected by pipes arranged alternately near the two ends of the sleeve (2). A first discharge pipe (109) is provided at one end of the sleeve (102) near the first refrigerant inlet (106), and a first feed pipe (108) is provided at one end of the sleeve (102) near the first refrigerant outlet (107). The first discharge pipe (109) is connected to the crude oil passage of the phase change heat storage component (3) through a pipe. The first feed pipe (108) is connected to the external crude oil pipeline.

4. The combined heat exchanger for a crude oil heating heat pump device according to claim 3, characterized in that, The inner surface of the sleeve (102), the inner tube (101), and the outer surface of the elbow (105) are all treated with a hydrophobic coating.

5. A combined heat exchanger for a crude oil heating heat pump device according to claim 3, characterized in that, The crude oil channel of the phase change heat storage component (3) includes a second spiral tube (302), one end of which is connected to the second feed pipe (308) and the other end is connected to the second discharge pipe (309); the second feed pipe (308) is connected to the first discharge pipe (109) of the refrigerant condenser (1), and the second discharge pipe (309) is connected to the external crude oil pipeline.

6. A combined heat exchanger for a crude oil heating heat pump device according to claim 3, characterized in that, The phase change heat storage component (3) includes a refrigerant channel including a first spiral tube (301), one end of which is connected to a second refrigerant inlet (306) and the other end is connected to a second refrigerant outlet (307). The second refrigerant outlet (307) is connected to the first refrigerant inlet (106) of the condenser, and the second refrigerant inlet (306) is connected to an external refrigerant pipeline.

7. A combined heat exchanger for a crude oil heating heat pump device according to claim 5 or 6, characterized in that, The first spiral tube (301) and the second spiral tube (302) are intertwined and simultaneously placed in a cylindrical cavity formed by the inner sleeve (303) and the outer sleeve (304), where phase change heat storage material is stored.

8. A combined heat exchanger for a crude oil heating heat pump device according to claim 7, characterized in that, The outer side of the outer sleeve (304) and the inner side of the inner sleeve (303) are both covered with an insulation layer.

9. A combined heat exchanger for a crude oil heating heat pump device according to claim 1, characterized in that, The enclosed flexible electric heating component (2) includes a heating layer (201), and current-carrying electrodes (202) are provided at both ends of the heating layer (201); the heating layer (201) is covered with a waterproof layer (203), the waterproof layer (203) is covered with an insulating layer (204), and the current-carrying electrodes (202) are connected to a power source.

10. A combined heat exchanger for a crude oil heating heat pump device according to claim 9, characterized in that, The heating layer (201) is a graphene electric heating film.

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