Gear refrigeration pump and refrigeration device

Abstract

This application discloses a gear-driven refrigeration pump and a refrigeration device, including a base, a stator assembly, a rotor assembly, and a gear assembly. The base has a first cavity and a second cavity, the first cavity communicating with the second cavity. The base also has an inlet and an outlet, the inlet communicating with the first cavity and the outlet communicating with the second cavity. The stator assembly is connected to the base and housed within the second cavity. The rotor assembly includes a connected shaft and a rotor, the rotor being housed within the second cavity, the shaft within the first and second cavities, and the rotor connected to the stator assembly. The gear assembly includes an internal gear and an external gear. The internal gear is located along a first direction on the side of the rotor facing the first cavity and is connected to the shaft. The external gear meshes with the circumference of the internal gear, and the internal gear is driven to rotate by the shaft. The gear-driven refrigeration pump of this invention can improve the inter-tooth volumetric efficiency of the external and internal gears, thereby improving the refrigerant delivery efficiency. The refrigeration device having the above-described gear-driven refrigeration pump also has the aforementioned advantages.

Description

Technical Field

[0001] This invention relates to the technical field of gear pumps, and more particularly to a gear refrigeration pump and refrigeration device. Background Technology

[0002] In related technologies, when a refrigeration pump is working, it drives an internal gear to rotate via an external gear, utilizing the meshing clearance between the external and internal gears to deliver refrigerant. However, the external gear of the refrigeration pump is affected by radial forces, resulting in poor stability of the meshing clearance between the external and internal gears. This leads to a decrease in the inter-tooth volumetric efficiency of the external and internal gears, thereby reducing the refrigerant delivery efficiency. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a gear refrigeration pump that can improve the inter-tooth volumetric efficiency of the external and internal gears, thereby improving the refrigerant delivery efficiency.

[0004] The present invention also proposes a refrigeration device having the above-mentioned gear refrigeration pump.

[0005] According to a first aspect of the present invention, a gear refrigeration pump has a first orientation and includes a base, a stator assembly, a rotor assembly, and a gear assembly.

[0006] The base has a first cavity and a second cavity, the first cavity being connected to the second cavity, and the base also has a liquid inlet and a liquid outlet, the liquid inlet being connected to the first cavity and the liquid outlet being connected to the second cavity; The stator assembly is connected to the base and housed in the second cavity; The rotor assembly includes a connected shaft and a rotor, the rotor being housed in a second cavity, the shaft being housed in a first cavity and a second cavity, the rotor being connected to the stator assembly, and the rotor being driven to rotate by the stator assembly, thereby causing the shaft to rotate. The gear assembly includes an internal gear and an external gear. The internal gear is located on the side of the rotor facing the first cavity along the first direction and is connected to the rotating shaft. The external gear meshes with the circumference of the internal gear. The internal gear is driven to rotate by the rotating shaft and drives the external gear to rotate.

[0007] The gear refrigeration pump according to embodiments of the present invention has at least the following beneficial effects: by driving the internal gear to rotate through the rotating shaft, and causing the internal gear to drive the external gear to rotate synchronously, the radial force of the gear refrigeration pump will act on the rotating shaft, thereby reducing the influence of the radial force on the gear, thus ensuring the stability of the meshing clearance between the external gear and the internal gear, and improving the refrigerant delivery efficiency.

[0008] According to some embodiments of the present invention, the internal gear and the external gear are housed in the first cavity; the base has a first flow port located between the internal gear and the external gear and the rotor along the first direction, and the first flow port communicates the first cavity and the second cavity.

[0009] According to some embodiments of the present invention, the gear refrigeration pump further includes a pump cover having a second flow port, the second flow port extending through both sides of the pump cover along the first direction, the pump cover being housed in the first cavity, and the second flow port communicating with the first cavity; on a plane perpendicular to the first direction, the orthographic projection of the outline of the first flow port and the orthographic projection of the outline of the second flow port are arranged opposite to each other.

[0010] According to some embodiments of the present invention, along the first direction, the second flow port is disposed opposite to at least a portion of the meshing position of the internal gear and the external gear.

[0011] According to some embodiments of the present invention, the gear refrigeration pump further includes a seal that surrounds the periphery of the external gear in a direction perpendicular to the first direction, the seal being located between the pump cover and at least a portion of the base, and connected to the pump cover and the base.

[0012] According to some embodiments of the present invention, the gear refrigeration pump further includes a pump cover located in the first cavity and separating the first cavity to form a lower cavity and an upper cavity. The lower cavity is connected to the upper cavity, the internal gear and the external gear are located in the upper cavity, and the liquid inlet is connected to the lower cavity.

[0013] According to some embodiments of the present invention, the pump cover is disposed opposite to at least a portion of the liquid inlet along a direction perpendicular to the first direction, a portion of the liquid inlet communicating with the lower cavity and a portion of the liquid inlet communicating with the upper cavity.

[0014] According to some embodiments of the present invention, at least a portion of the external gear abuts against the outer peripheral wall of the internal gear, and the internal gear and the external gear each have a rotation center, wherein the rotation center of the internal gear is eccentrically disposed from the rotation center of the external gear.

[0015] According to some embodiments of the present invention, the base includes a housing, a stator housing, and a bearing housing. The housing has a first cavity and a second cavity. The stator housing and the bearing housing are housed in the second cavity. The stator assembly is connected to the stator housing. The housing, the stator housing, and the bearing housing are integrally formed.

[0016] The refrigeration apparatus according to a second aspect of the present invention includes the gear refrigeration pump described in any of the above embodiments.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the gear refrigeration pump in an embodiment of the present invention; Figure 2 This is a schematic diagram of the gear refrigeration pump in an embodiment of the present invention; Figure 3 This is a side sectional view of the gear refrigeration pump in an embodiment of the present invention; Figure 4 This is a side sectional view of the gear refrigeration pump in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the base and pump cover in an embodiment of the present invention; Figure 6 This is a schematic diagram of the internal and external gear structures in an embodiment of the present invention.

[0019] Figure label: Gear refrigeration pump 100; Base 110; First cavity 111; Lower cavity 1111; Upper cavity 1112; Second cavity 112; Liquid inlet 113; Liquid outlet 114; First overflow port 115; Stator assembly 120; Rotor assembly 130; shaft 131; rotor 132; flow passage 133; Gear assembly 140; internal gear 141; external gear 142; Pump cover 150; Second flow port 151; Seal 160. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 limiting this invention.

[0022] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The gear-driven refrigeration pump of a first aspect embodiment and the refrigeration apparatus of a second aspect embodiment of the present invention will now be described with reference to the accompanying drawings. It should be noted that the gear-driven refrigeration pump and the refrigeration apparatus have a first direction. For ease of description and understanding, the vertical direction is schematically used to represent the first direction in this application.

[0026] A first aspect of the present invention provides a gear refrigeration pump 100, such as... Figures 1 to 3 As shown, the gear refrigeration pump 100 includes a base 110, a stator assembly 120, a rotor assembly 130, and a gear assembly 140. The base 110 has a first cavity 111 and a second cavity 112, which are connected. The base 110 also has a liquid inlet 113 and a liquid outlet 114, with the liquid inlet 113 connected to the first cavity 111 and the liquid outlet 114 connected to the second cavity 112.

[0027] The stator assembly 120 is connected to the base 110 and housed in the second cavity 112. The rotor assembly 130 includes a shaft 131 and a rotor 132 connected to each other. The rotor 132 is housed in the second cavity 112, and a portion of the shaft 131 is housed in the first cavity 111, while another portion is housed in the second cavity 112. The rotor 132 is connected to the stator assembly 120. The stator assembly 120 establishes a magnetic field to drive the rotor 132 to rotate, thereby enabling the rotor 132 to drive the shaft 131 to rotate.

[0028] The gear assembly 140 includes an internal gear 141 and an external gear 142. The internal gear 141 is located on the side of the rotor 132 facing the first cavity 111 in the vertical direction and is connected to the rotor 132. The external gear 142 is disposed around the internal gear 141 and meshes with it. When the rotating shaft 131 is driven to rotate, the rotating shaft 131 drives the internal gear 141 to rotate, and the internal gear 141 synchronously drives the external gear 142 to rotate.

[0029] Specifically, in one example, refrigerant enters the first chamber 111 through the inlet 113, and the internal gear 141 is mounted on the rotating shaft 131 via a keyway. The base 110 has gear slots in which the internal gear 141 and the external gear 142 are housed. When the gear refrigeration pump 100 is energized, the stator assembly 120 establishes a magnetic field that drives the rotor 132 to rotate. The rotor 132 synchronously drives the rotating shaft 131 to rotate, which in turn drives the internal gear 141 to rotate, causing the external gear 142 to follow the rotation of the internal gear 141. As the internal gear 141 and the external gear 142 rotate, they continuously mesh, causing a change in the volume between their teeth. When the teeth of the internal gear 141 and the external gear 142 disengage, the inter-tooth volume increases, creating a localized negative pressure between them. The negative pressure draws the refrigerant from the first chamber 111 into the space between the gear teeth. When the teeth of the internal gear 141 and the external gear 142 begin to mesh, the volume between the teeth decreases. At this time, the refrigerant in the second chamber 112 is squeezed to flow towards the liquid outlet 114. The rotor assembly 130 has a flow channel 133 that connects to the liquid outlet 114. After being squeezed, the refrigerant enters the flow channel 133 and is eventually discharged from the liquid outlet 114 of the base 110, thereby realizing the input and output of refrigerant.

[0030] In this embodiment of the invention, the gear refrigeration pump 100 drives the internal gear 141 to rotate via the rotating shaft 131, and the internal gear 141 drives the external gear 142 to rotate synchronously. The radial force of the gear refrigeration pump 100 acts on the rotating shaft 131, thereby reducing the influence of the radial force on the gear, thus ensuring the stability of the meshing clearance between the external gear 142 and the internal gear 141, and improving the refrigerant delivery efficiency.

[0031] like Figure 2 and Figure 4 As shown, in one possible embodiment, the internal gear 141 and the external gear 142 are housed in the first cavity 111. The base 110 has a first flow port 115, which is located vertically between the internal gear 141 and the external gear 142 and the rotor 132. The first flow port 115 connects the first cavity 111 and the second cavity 112. When refrigerant is supplied, the refrigerant passes through the gap between the teeth of the internal gear 141 and the external gear 142, then enters the second cavity 112 through the first flow port 115, and finally exits from the second cavity 112 through the liquid outlet 114.

[0032] Specifically, when refrigerant is introduced into the first cavity 111 through the liquid inlet 113, the internal gear 141 and the external gear 142 are wetted by the refrigerant. Since the internal gear 141 and the external gear 142 are housed in the first cavity 111, the radial force exerted by the refrigerant on the internal gear 141 and the external gear 142 is canceled out. That is, the refrigerant wets the internal gear 141 and the external gear 142, and the refrigerant exerts radial force on the internal gear 141 and the external gear 142 in all directions. The air pressure at all locations within the first cavity 111 is the same, the hydraulic pressure generated by the refrigerant is the same, and the radial component of the hydraulic force is also the same. This allows the radial forces acting on the internal gear 141 and the external gear 142 to cancel each other out, thereby reducing the impact of the radial force on the gear assembly 140, and further improving the meshing stability of the internal gear 141 and the external gear 142, and improving the refrigerant delivery efficiency. Furthermore, since the refrigerant is continuously supplied to the second chamber 112, the pressure in the second chamber 112 will be greater than the pressure in the first chamber 111. The internal gear 141 and the external gear 142 are housed in the first chamber 111, which can reduce the influence of liquid pressure on the gear assembly 140, thereby further improving the working stability of the gear assembly 140.

[0033] like Figure 4 and Figure 5 As shown, in a further embodiment, the gear refrigeration pump 100 further includes a pump cover 150, which has a second flow port 151. The second flow port 151 extends through both sides of the pump cover 150 in the vertical direction. The pump cover 150 is housed in a first cavity 111, and the second flow port 151 communicates with the first cavity 111. On a plane perpendicular to the vertical direction, the orthographic projections of the outlines of the first flow port 115 and the second flow port 151 are positioned opposite each other.

[0034] Specifically, the gear assembly 140 is located vertically between the first flow port 115 and the second flow port 151. During refrigerant delivery, the refrigerant is positioned below the gear assembly 140. When the external gear 142 and the internal gear 141 separate, a local negative pressure is generated between them, causing the refrigerant to be attracted. This negative pressure draws the refrigerant from the first cavity 111 through the second flow port 151 into the space between the first flow port 115 and the gear assembly 140. When the external gear 142 and the internal gear 141 mesh, the refrigerant is thrust, causing it to flow through the first flow port 115 and into the second cavity 112.

[0035] In this embodiment, on the horizontal projection plane, the first outlet 115 and the second outlet 151 are arranged offset horizontally to form a relatively opposed structure. This allows the refrigerant to form a circuitous flow path when passing through the second outlet 151 and the first outlet 115 on the horizontal plane. Specifically, after the refrigerant is drawn into the space between the first outlet 115 and the gear assembly 140 at the second outlet 151, the refrigerant is propelled by the engagement of the internal gear 141 and the external gear 142 at the second outlet 151. During the refrigerant flow, the engagement position of the internal gear 141 and the external gear 142 continuously changes. When the refrigerant flows to the first outlet 115, the internal gear 141 and the external gear 142 at the first outlet 115 engage, thereby pushing the refrigerant from the first outlet 115 into the second cavity 112, thus improving the refrigerant delivery efficiency.

[0036] like Figure 4 As shown, in one possible implementation, the second flow port 151 is positioned opposite to at least a partial meshing position of the internal gear 141 and the external gear 142 along the vertical direction. In a specific embodiment, the orthographic projection of the outline of the second flow port 151 in the vertical direction overlaps with the orthographic projections of the internal gear 141 and the external gear 142. Since the internal gear 141 and the external gear 142 rotate, the positions of the internal gear 141 and the external gear 142 corresponding to the second flow port 151 will mesh. Because refrigerant delivery requires the meshing of the internal gear 141 and the external gear 142, positioning the second flow port 151 opposite to the partial meshing position of the internal gear 141 and the external gear 142 can increase the force exerted by the internal gear 141 and the external gear 142 on the refrigerant, thereby improving the refrigerant delivery efficiency.

[0037] like Figure 4As shown, in some embodiments, the gear refrigeration pump 100 further includes a seal 160, which surrounds the periphery of the external gear 142 in a direction perpendicular to the up and down direction. The seal 160 is located between the pump cover 150 and at least a portion of the base 110, and the seal 160 is connected to the pump cover 150 and the base 110.

[0038] Specifically, in one example, the base 110 has a gear groove in which an internal gear 141 and an external gear 142 are fitted. It is understood that if the internal gear 141 and external gear 142 are located in the first cavity 111, the gear groove is part of the first cavity 111. If the internal gear 141 and external gear 142 are located in the second cavity 112, the gear groove is part of the second cavity 112. The pump cover 150 is connected to the bottom wall of the gear groove. A seal 160 is located on the periphery of the external gear 142 and is situated between the gear groove and the pump cover 150. The seal 160 is pressed against the bottom wall of the gear groove and the pump cover 150. In this embodiment, the seal 160 can provide a circumferential seal to the end faces of the pump cover 150 and the gear groove. The second outlet 151 and the gear assembly 140 are both located within the sealing area of ​​the seal 160. When the internal gear 141 and external gear 142 mesh to deliver refrigerant, the refrigerant passes through the second outlet 151 and the meshing gap between the internal gear 141 and the external gear 142. The seal 160 prevents circumferential leakage of refrigerant from the gear assembly 140 during delivery, thus avoiding any impact on refrigerant delivery efficiency.

[0039] like Figure 3 and Figure 4 As shown, in one possible embodiment, the gear refrigeration pump 100 further includes a pump cover 150 located within the first cavity 111. The pump cover 150 divides the first cavity 111 into an upper cavity 1112 and a lower cavity 1111, which are interconnected. An internal gear 141 and an external gear 142 are located in the upper cavity 1112, and a liquid inlet 113 is connected to the lower cavity 1111.

[0040] Specifically, when the refrigerant enters the lower cavity 1111 through the inlet 113, under the meshing action of the internal gear 141 and the external gear 142, the refrigerant will enter the upper cavity 1112 through the second outlet 151 of the pump cover 150, and after entering the upper cavity 1112, it will be transported by the internal gear 141 and the external gear 142 to the first outlet 115 to enter the second cavity 112. In this embodiment, during the process of injecting refrigerant into the first cavity 111, some of the refrigerant will vaporize. The pump cover 150 divides the first cavity 111 into the lower cavity 1111 and the upper cavity 1112, so that when some of the refrigerant vaporizes due to temperature or pressure changes, the vaporized refrigerant can move upward under the action of gravity to accumulate in the upper cavity 1112. Since the internal gear 141 and external gear 142 are also located in the upper cavity 1112, the liquid refrigerant is transported to the second cavity 112 by the internal gear 141 and external gear 142 before the vaporized refrigerant, thus ensuring the refrigerant transport capacity and stability of the internal gear 141 and external gear 142. As the gear refrigeration pump 100 continues to operate, the pressure in the upper cavity 1112 will continuously increase, and the vaporized refrigerant accumulated in the upper cavity 1112 will gradually condense under pressure, transforming back into liquid refrigerant. The liquid refrigerant sinks to the surface of the pump cover 150 or the lower cavity 1111 under gravity, and is eventually transported by the gear assembly 140 to participate in the compression and transport cycle again, thereby avoiding the situation where the vaporized refrigerant is transported by the gear assembly 140, reducing the refrigerant transport volume and causing a decrease in refrigerant transport efficiency.

[0041] like Figure 4 As shown, in a further embodiment, the pump cover 150 is positioned opposite to at least a portion of the liquid inlet 113 along a direction perpendicular to the vertical direction. The portion of the liquid inlet 113 connects to the lower cavity 1111, and the portion connects to the upper cavity 1112. Specifically, in the circumferential direction, the pump cover 150 is positioned opposite to the portion of the liquid inlet 113, and the liquid inlet 113 is separated by the pump cover 150 along the vertical direction. A portion of the liquid inlet 113 connects to the lower cavity 1111, and another portion connects to the upper cavity 1112.

[0042] During the refrigerant injection into the first chamber 111, if some of the refrigerant vaporizes, it will rise above the liquid refrigerant under gravity. The vaporized refrigerant will enter the upper chamber 1112 through the liquid inlet 113, and the liquid refrigerant will enter the lower chamber 1111 through the liquid inlet 113. This ensures that when the internal gear 141 and external gear 142 mesh, the refrigerant drawn in through the second overflow port 151 is always liquid, thus ensuring the refrigerant delivery capacity and efficiency. Furthermore, by introducing the vaporized and liquid refrigerant separately, the vaporized and liquid refrigerants can be separated within the first chamber 111. This facilitates processing of the vaporized refrigerant (such as increasing the pressure in the upper chamber 1112) to convert it into liquid refrigerant, thereby increasing the speed at which the refrigerant participates in the delivery cycle and further improving the refrigerant delivery efficiency.

[0043] like Figure 5 As shown, in some embodiments, at least some of the teeth of the external gear 142 abut against the outer peripheral wall of the internal gear 141. The internal gear 141 and the external gear 142 each have a rotation center, and the rotation centers of the internal gear 141 and the external gear 142 are eccentrically arranged.

[0044] Specifically, the rotation center of the internal gear 141 is O1, and the rotation center of the external gear 142 is O2. The rotation centers O1 and O2 are offset, meaning they are not concentric, and there is an eccentricity between them. In this embodiment, the eccentric setting of the rotation centers O1 and O2 allows the internal gear 141 and the external gear 142 to continuously mesh and disengage, thereby enabling the refrigerant to continuously enter from the first cavity 111 to the second cavity 112 and exit from the second cavity 112 to the liquid outlet 114. This achieves continuous intake, compression, and discharge of the refrigerant, thereby improving the meshing smoothness between the internal gear 141 and the external gear 142 and the refrigerant delivery efficiency.

[0045] In another embodiment, the base 110 includes a housing, a stator housing, and a bearing housing. The housing has a first cavity 111 and a second cavity 112. Both the stator housing and the bearing housing are housed within the second cavity 112. The stator assembly 120 is connected to the stator housing. Specifically, the gear refrigeration pump 100 also includes sliding bearings, which are interference-fitted with the bearing housing. At least two sliding bearings are included, and some of these bearings are fitted with thrust ball bearings. The thrust ball bearings abut against the rotor assembly 130 to withstand axial forces. When the gear refrigeration pump 100 operates, the rotor assembly 130 may generate an axial force in the vertical direction under the action of electromagnetic force and gear meshing force. This axial force is transmitted to the thrust ball bearings via the shaft 131 and is borne by the thrust ball bearings, reducing the impact of the axial force on the rotor assembly 130 and the gear assembly 140, thereby improving the operational stability of the gear refrigeration pump 100.

[0046] In this embodiment, the outer shell, stator housing, and bearing housing are integrally formed. Specifically, the outer shell, stator housing, and bearing housing can be integrally formed into a single structure through processes such as casting and forging. Integral forming of the outer shell, stator housing, and bearing housing can improve the structural strength and rigidity of the base 110, and can also improve the assembly consistency of the product, reduce the influence of radial and axial forces during the operation of the gear refrigeration pump 100, reduce the relative displacement or loosening between components, thereby improving the support accuracy of the shaft 131 on the internal gear 141 and the stability of gear meshing, and thus improving the refrigerant delivery efficiency.

[0047] A second aspect of this application provides a refrigeration device, such as... Figures 1 to 6 As shown, the refrigeration device includes the gear refrigeration pump 100 described in any of the above embodiments. Therefore, the refrigeration device includes all the technical solutions mentioned in the above embodiments with beneficial effects, which will not be repeated here.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A gear-driven refrigeration pump, having a first direction, characterized in that, include: The base has a first cavity and a second cavity, the first cavity being connected to the second cavity, and the base also has a liquid inlet and a liquid outlet, the liquid inlet being connected to the first cavity and the liquid outlet being connected to the second cavity; A stator assembly is connected to the base and housed in the second cavity; A rotor assembly includes a connected shaft and a rotor, the rotor being housed in a second cavity, the shaft being housed in a first cavity and a second cavity, the rotor being connected to the stator assembly, the rotor being driven to rotate by the stator assembly, and driving the shaft to rotate; The gear assembly includes an internal gear and an external gear. The internal gear is located on the side of the rotor facing the first cavity along the first direction and is connected to the rotating shaft. The external gear meshes with the circumference of the internal gear. The internal gear is driven to rotate by the rotating shaft and drives the external gear to rotate.

2. The gear refrigeration pump according to claim 1, characterized in that, The internal gear and the external gear are housed in the first cavity; The base has a first flow port, which is located between the internal gear and the external gear and the rotor along the first direction, and the first flow port connects the first cavity and the second cavity.

3. The gear refrigeration pump according to claim 2, characterized in that, The gear refrigeration pump further includes a pump cover, which has a second flow port. The second flow port extends through both sides of the pump cover along the first direction. The pump cover is housed in the first cavity, and the second flow port communicates with the first cavity. On a plane perpendicular to the first direction, the orthographic projections of the contours of the first and second flow ports are positioned opposite each other.

4. The gear refrigeration pump according to claim 3, characterized in that, Along the first direction, the second flow port is disposed opposite to at least a portion of the meshing position of the internal gear and the external gear.

5. The gear refrigeration pump according to claim 3, characterized in that, The gear refrigeration pump further includes a seal that surrounds the periphery of the external gear in a direction perpendicular to the first direction. The seal is located between the pump cover and at least a portion of the base and is connected to the pump cover and the base.

6. The gear refrigeration pump according to claim 1, characterized in that, The gear refrigeration pump also includes a pump cover, which is located in the first cavity and separates the first cavity to form a lower cavity and an upper cavity. The lower cavity is connected to the upper cavity. The internal gear and the external gear are located in the upper cavity, and the liquid inlet is connected to the lower cavity.

7. The gear refrigeration pump according to claim 6, characterized in that, Along a direction perpendicular to the first direction, the pump cover is disposed opposite to at least a portion of the liquid inlet, a portion of the liquid inlet communicating with the lower cavity and a portion of the liquid inlet communicating with the upper cavity.

8. The gear refrigeration pump according to claim 1, characterized in that, At least a portion of the external gear abuts against the outer peripheral wall of the internal gear. The internal gear and the external gear each have a rotation center, and the rotation center of the internal gear is eccentrically positioned relative to the rotation center of the external gear.

9. The gear refrigeration pump according to claim 1, characterized in that, The base includes a housing, a stator housing, and a bearing housing. The housing has a first cavity and a second cavity. The stator housing and the bearing housing are housed in the second cavity. The stator assembly is connected to the stator housing. The outer casing, the stator housing, and the bearing housing are integrally formed.

10. A refrigeration device, characterized in that, include: The gear refrigeration pump according to any one of claims 1 to 9.

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