Low-temperature heat pump lubricating oil heating structure and heat pump compressor

Abstract

The utility model relates to the technical field of heat pump compressors, in particular to a low-temperature heat pump lubricating oil heating structure and a heat pump compressor. The low-temperature heat pump lubricating oil heating structure comprises a heat pump shell and a heating element. The heat pump shell is provided with an inner cavity, the side wall of the heat pump shell is provided with a heating cavity separated from the inner cavity, and the heating element is contained in the heating cavity. The low-temperature heat pump lubricating oil heating structure is applied to a heat pump compressor and can improve the flowability of compressor lubricating oil in a low-temperature environment, so that the reliability of the heat pump compressor is guaranteed, the filling amount of the lubricating oil can be reduced, and the situation that the circulating resistance in the compressor is increased due to excessive lubricating oil is avoided; therefore, the working efficiency of the compressor can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pump compressors, and particularly to a low-temperature heat pump lubricating oil heating structure and a heat pump compressor. Background Art

[0002] At present, the heat pump compressor system installed in mainstream new energy vehicles transfers energy by using the heat in the environment, and only a small amount of electric energy needs to be consumed to achieve a high heating efficiency, which can significantly improve the driving range of the vehicle compared with the traditional high-voltage PTC.

[0003] However, in a low-temperature environment, the viscosity of the lubricating oil in the compressor will increase, resulting in poor fluidity, which affects the lubrication efficiency, heat exchange and increases power consumption. Increasing the filling amount of the lubricating oil can ensure that there is enough lubricating oil to cover and lubricate all moving parts inside the compressor at low temperature, reduce wear, improve the heat exchange efficiency at the same time, and more lubricating oil can more effectively absorb and disperse the heat generated during the compression process to protect the compressor from heat damage.

[0004] However, increasing the filling amount of the lubricating oil in the heat pump compressor will reduce the efficiency. Too much lubricating oil will increase the circulation resistance inside the compressor, resulting in increased work done by the compressor and reduced efficiency. Too much lubricating oil may also accumulate in the heat exchanger, affecting the heat exchange efficiency and thus reducing the energy efficiency ratio of the entire system. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a low-temperature heat pump lubricating oil heating structure and a heat pump compressor, which can improve the fluidity of the compressor lubricating oil in a low-temperature environment, thereby ensuring the reliability of the heat pump compressor, and further being able to reduce the filling amount of the lubricating oil, thus avoiding the increase of the circulation resistance inside the compressor due to too much lubricating oil, and being able to improve the working efficiency of the compressor.

[0006] The embodiments of the utility model are implemented as follows:

[0007] In a first aspect, the utility model provides a low-temperature heat pump lubricating oil heating structure, which includes a heat pump housing and a heating element;

[0008] The heat pump housing is configured with an inner cavity, and the side wall of the heat pump housing is configured with a heating cavity separated from the inner cavity, and the heating element is accommodated in the heating cavity.

[0009] In an optional embodiment, the low-temperature heat pump lubricating oil heating structure further includes a heat preservation and heat insulation member arranged in the heating cavity; the heat preservation and heat insulation member is located on the side of the heating element facing away from the inner cavity.

[0010] In an alternative embodiment, one side of the heating element facing the inner cavity is in contact with the inner wall of the heating cavity, and the remaining sides of the heating element are covered by a heat insulation and heat preservation member.

[0011] In an alternative embodiment, the heat pump housing is configured with a control cavity separated from the inner cavity, and the control cavity communicates with the heating cavity.

[0012] In an alternative embodiment, the heating cavity extends along the axial direction of the heat pump housing.

[0013] In an alternative embodiment, along the axial direction of the heat pump housing, one end of the heating cavity is open, and the open end of the heating cavity communicates with the control cavity.

[0014] In an alternative embodiment, a heat insulation pad is arranged on the inner end surface of the heating cavity, and a sealant layer is arranged at the opening end of the heating cavity.

[0015] In an alternative embodiment, the heating element includes a ceramic heating element or a heating resistance wire.

[0016] In an alternative embodiment, the heating cavity includes a plurality of sub-chambers, and the plurality of sub-chambers are arranged at intervals around the axial direction of the heat pump housing;

[0017] The low-temperature heat pump lubricating oil heating structure includes a plurality of heating elements, and at least one heating element is arranged in each sub-chamber.

[0018] In a second aspect, the present invention provides a heat pump compressor, and the heat pump compressor includes the low-temperature heat pump lubricating oil heating structure according to any one of the foregoing embodiments.

[0019] The beneficial effects of the embodiments of the present invention include:

[0020] The low-temperature heat pump lubricating oil heating structure includes a heat pump housing and a heating element; the heat pump housing is configured with an inner cavity, the side wall of the heat pump housing is configured with a heating cavity separated from the inner cavity, and the heating element is accommodated in the heating cavity. The low-temperature heat pump lubricating oil heating structure is applied to a heat pump compressor, and it can heat the lubricating oil in the inner cavity of the heat pump housing, thereby improving the fluidity of the compressor lubricating oil in a low-temperature environment, and thus ensuring the reliability of the heat pump compressor; and since the fluidity of the lubricating oil can be increased by heating, the filling amount of the lubricating oil can be reduced, thereby avoiding an increase in the internal circulation resistance of the compressor due to excessive lubricating oil, and thus improving the working efficiency of the compressor. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a cross-sectional view of the low-temperature heat pump lubricating oil heating structure in the embodiments of the present invention;

[0023] Figure 2 It is a partial schematic view of the low-temperature heat pump lubricating oil heating structure in the embodiments of the present invention;

[0024] Figure 3 It is a schematic structural view of the heat pump housing in the embodiments of the present invention;

[0025] Figure 4 It is a schematic structural view of the first perspective of the low-temperature heat pump lubricating oil heating structure in the embodiments of the present invention;

[0026] Figure 5 It is a schematic structural view of the second perspective of the low-temperature heat pump lubricating oil heating structure in the embodiments of the present invention;

[0027] Figure 6 It is a layout schematic view of the sub-chamber in the embodiments of the present invention.

[0028] Reference numerals: 100 - low-temperature heat pump lubricating oil heating structure; 110 - heat pump housing; 120 - heating element; 111 - inner cavity; 112 - heating cavity; 130 - heat insulation member; 113 - control cavity; 114 - sub-chamber. Detailed embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0033] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] Currently, the heat pump compressor system installed in mainstream new energy vehicles transfers energy by using the heat in the environment and can achieve a high heating efficiency with only a small amount of electric energy consumption. Compared with traditional high-voltage PTC, it can significantly improve the vehicle's cruising range. However, in a low-temperature environment, the viscosity of the lubricating oil in the compressor increases, making its fluidity worse, thus affecting the lubrication efficiency, heat exchange, and increasing power consumption. Increasing the filling amount of the lubricating oil can ensure that there is enough lubricating oil to cover and lubricate all moving parts inside the compressor at low temperatures, reduce wear, and at the same time improve the heat exchange efficiency. Moreover, a larger amount of lubricating oil can more effectively absorb and disperse the heat generated during the compression process, protecting the compressor from heat damage.

[0036] However, increasing the filling amount of the lubricating oil in the heat pump compressor will bring various negative effects:

[0037] 1. It will reduce efficiency. Too much lubricating oil will increase the circulation resistance inside the compressor, resulting in increased work and reduced efficiency. Excessive lubricating oil may also accumulate in the heat exchanger, affecting the heat exchange efficiency, thereby reducing the energy efficiency ratio of the entire system.

[0038] 2. Increase the starting burden: Too much lubricating oil requires more energy to drive, especially when starting at low temperatures. Too much lubricating oil will increase the starting load of the compressor, which may cause starting difficulties or increase starting time, and even cause damage to the motor.

[0039] 3. Affecting the refrigerant cycle: Too much lubricating oil may mix with the refrigerant, increase the viscosity of the refrigerant, and affect the circulation volume and speed of the refrigerant. Under low temperature conditions, this may cause the refrigerant to flow poorly in the system, affecting the heating or cooling efficiency;

[0040] 4. Liquid hammer may occur: too much lubricating oil, especially after the compressor is shut down, the lubricating oil may gather in certain parts due to gravity. When the compressor is started again, the accumulated lubricating oil may be suddenly sucked into the compressor, forming liquid hammer, causing mechanical shock inside the compressor, and in severe cases, damaging the compressor parts;

[0041] 5. Increased maintenance costs: Long-term excessive lubrication may cause oil accumulation and blockage inside the system, requiring more frequent maintenance and cleaning, increasing usage and maintenance costs.

[0042] Based on the above reasons, this embodiment provides a low-temperature heat pump lubricating oil heating structure 100, please refer to Figures 1 - 5 , the low-temperature heat pump lubricating oil heating structure 100 includes a heat pump housing 110 and a heating element 120;

[0043] The heat pump housing 110 is configured with an inner cavity 111 , and a side wall of the heat pump housing 110 is configured with a heating cavity 112 separated from the inner cavity 111 , and the heating element 120 is accommodated in the heating cavity 112 .

[0044] Please refer to Figures 1 - 5 The working principle of the low-temperature heat pump lubricating oil heating structure 100 is:

[0045] The low-temperature heat pump lubricating oil heating structure 100 is applied to a heat pump compressor. The low-temperature heat pump lubricating oil heating structure 100 includes a heat pump housing 110 and a heating element 120. The heat pump housing 110 is configured with an inner cavity 111, in which lubricating oil is accommodated, and the side wall of the heat pump housing 110 is configured with a heating cavity 112 separated from the inner cavity 111, and the heating element 120 is accommodated in the heating cavity 112. Thus, the heating element 120 disposed in the heating cavity 112 can heat the lubricating oil in the inner cavity 111 of the heat pump housing 110, thereby improving the fluidity of the compressor lubricating oil in a low-temperature environment and ensuring the reliability of the heat pump compressor. Moreover, since the fluidity of the lubricating oil can be increased by heating in a low-temperature environment, the filling amount of the lubricating oil can be reduced, thereby avoiding an increase in the circulation resistance inside the compressor due to excessive lubricating oil, and thus improving the working efficiency of the compressor.

[0046] In addition, through the above-mentioned heating element 120 and the structural arrangement of the heating element 120, the following functions are also available:

[0047] It can reduce the starting load of the compressor, avoid difficult starting or increased starting time due to excessive starting load, and thus avoid damaging the motor.

[0048] It can also avoid affecting the refrigerant circulation, reduce the amount of lubricating oil mixed with the refrigerant, avoid an increase in the viscosity of the refrigerant, and thus maintain the normal circulation amount and speed of the refrigerant, and further avoid poor flow of the refrigerant under low-temperature conditions, thereby ensuring the normal operation of the heating or cooling function.

[0049] Avoid the lubricating oil accumulating in certain parts due to gravity after the compressor stops, thereby avoiding the phenomenon of liquid slugging when the accumulated lubricating oil is suddenly sucked into the compressor when the compressor starts again, and thus avoiding mechanical shock damage to the compressor components due to the liquid slugging phenomenon inside the compressor.

[0050] Reduce the risk of oil accumulation and blockage inside the system, thereby reducing the maintenance and cleaning frequency and lowering the usage cost and maintenance cost.

[0051] Furthermore, please refer to Figures 1 - 5 , in this embodiment, during the operation of the heating element 120, to improve its heating efficiency for the lubricating oil, that is, to ensure that the heat generated by the heating element 120 can be transferred to the lubricating oil, therefore, the low-temperature heat pump lubricating oil heating structure 100 further includes a heat insulation member 130 disposed in the heating cavity 112; the heat insulation member 130 is located on the side of the heating element 120 away from the inner cavity 111. Thus, through such an arrangement, heat dissipation can be reduced, thereby improving its heating efficiency for the lubricating oil.

[0052] When configuring the heating element 120 and the heat insulation member 130, in this embodiment, the side of the heating element 120 facing the inner cavity 111 is attached to the inner wall of the heating cavity 112, and the remaining sides of the heating element 120 are covered by the heat insulation member 130. Through such a setting method, the heat generated by the heating element 120 can be conducted towards the inner cavity 111, thereby increasing the heating effect on the lubricating oil.

[0053] It can be understood that in this embodiment, for the convenience of installing the control component for controlling the heat pump compressor, the heat pump housing 110 is configured with a control cavity 113 separated from the inner cavity 111. The control component is installed in the control cavity 113, and the control cavity 113 is communicated with the heating cavity 112. Thus, the heating element 120 can be conveniently electrically connected to the control component located in the control cavity 113, thereby facilitating the control of the working state of the heat pump compressor and the heating state of the heating element 120.

[0054] For the convenience of communicating the control cavity 113 with the heating cavity 112, the heating cavity 112 extends along the axial direction of the heat pump housing 110; and along the axial direction of the heat pump housing 110, one end of the heating cavity 112 is open, and the open end of the heating cavity 112 is communicated with the control cavity 113. Through such a setting method, the communication method between the heating cavity 112 and the control cavity 113 is simplified;

[0055] Moreover, on this basis, to improve the sealing performance and heat preservation performance of the heating cavity 112 and avoid the loss of heat from its two ends, an insulating pad is configured on the inner end surface of the heating cavity 112, and a sealing glue layer is provided at the opening end of the heating cavity 112.

[0056] Based on the above content, please refer to Figures 1 - 5 , when configuring the heating element 120 in this embodiment, the heating element 120 includes a ceramic heating element or a heating resistance wire. In other embodiments of the present invention, the heating element 120 can also adopt other structural types of heating structures.

[0057] Please refer to Figures 1 - 6 , and to improve the heating effect on the lubricating oil, the heating cavity 112 includes a plurality of sub-chambers 114, and the plurality of sub-chambers 114 are arranged at intervals along the axial direction of the heat pump housing 110; and the low-temperature heat pump lubricating oil heating structure 100 includes a plurality of heating elements 120, and at least one heating element 120 is arranged in each sub-chamber 114. That is, through such a setting method, the heating surface of the lubricating oil can be increased to improve the heating uniformity of the lubricating oil and the heating efficiency of the lubricating oil. It should be noted that in this embodiment, when configuring the heating element 120, the structural shape of the heating element 120 is adapted to the shape of the heating cavity 112 or the sub-chamber 114 to improve the heat conduction efficiency.

[0058] Based on the above content, please refer to Figures 1 - 6 Figures 1 - 6 , this embodiment further provides a heat pump compressor, which includes the low-temperature heat pump lubricating oil heating structure 100 of any one of the foregoing embodiments. By adopting the above-mentioned low-temperature heat pump lubricating oil heating structure 100, the heat pump compressor can heat the lubricating oil in the inner cavity 111 of the heat pump housing 110 through the heating element 120 disposed in the heating cavity 112, thereby improving the fluidity of the compressor lubricating oil in a low-temperature environment and ensuring the reliability of the heat pump compressor; moreover, since the fluidity of the lubricating oil can be increased by heating in a low-temperature environment, the filling amount of the lubricating oil can be reduced, thereby avoiding an increase in the circulation resistance inside the compressor due to excessive lubricating oil, and thus improving the working efficiency of the compressor.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-temperature heat pump lubricating oil heating structure, characterized in that: The low-temperature heat pump lubricating oil heating structure comprises a heat pump housing and a heating element; The heat pump housing is configured with an inner cavity, and the side wall of the heat pump housing is configured with a heating cavity separated from the inner cavity, and the heating element is accommodated in the heating cavity.

2. The low-temperature heat pump lubricating oil heating structure according to claim 1, characterized in that: The low-temperature heat pump lubricating oil heating structure further comprises a heat-insulating component arranged in the heating chamber; The thermal insulation component is located on a side of the heating element away from the inner cavity.

3. The low-temperature heat pump lubricating oil heating structure according to claim 2, characterized in that: The side of the heating element facing the inner cavity is in contact with the inner wall of the heating cavity, and the other side surfaces of the heating element are covered by the thermal insulation component.

4. The low-temperature heat pump lubricating oil heating structure according to claim 1, characterized in that: The heat pump housing is provided with a control chamber separated from the inner chamber, and the control chamber is communicated with the heating chamber.

5. The low-temperature heat pump lubricating oil heating structure according to claim 4, characterized in that: The heating chamber extends along the axial direction of the heat pump housing.

6. The low-temperature heat pump lubricating oil heating structure according to claim 5, characterized in that: Along the axial direction of the heat pump housing, one end of the heating chamber is open, and the open end of the heating chamber is communicated with the control chamber.

7. The low-temperature heat pump lubricating oil heating structure according to claim 6, characterized in that: The inner end surface of the heating chamber is provided with a heat insulation pad, and the open end of the heating chamber is provided with a sealing rubber layer.

8. The low-temperature heat pump lubricating oil heating structure according to claim 1, characterized in that: The heating element comprises a ceramic heating element or a heating resistance wire.

9. The low-temperature heat pump lubricating oil heating structure according to any one of claims 1 to 8, characterized in that: The heating chamber comprises a plurality of sub-chambers, and the plurality of sub-chambers are arranged at intervals around the axis direction of the heat pump housing; The low-temperature heat pump lubricating oil heating structure comprises a plurality of the heating elements, and at least one heating element is disposed in each of the sub-chambers.

10. A heat pump compressor, characterized in that: The heat pump compressor comprises the low-temperature heat pump lubricating oil heating structure according to any one of claims 1-9.

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