High pressure internal gear pump

Abstract

The utility model discloses a high pressure internal meshing gear pump, include: compensation subassembly, compensation subassembly is located the inside of outer gear, and is located between outer gear and internal gear, compensation subassembly includes: upper crescent plate, lower crescent plate and two elastic sealing components, upper crescent plate and lower crescent plate are connected in proper order in the inside of outer gear along the radial direction of outer gear, the side of upper crescent plate faces lower crescent plate and is formed with first oil collecting groove and second oil collecting groove in proper order by two end portions to the center direction, the both ends of upper crescent plate are central symmetry, the both ends of upper crescent plate are central symmetry, the both ends of upper crescent plate are central symmetry, the both edges of the side of upper crescent plate face lower crescent plate and are formed with first inclined plane, first inclined plane extends by the end portion of upper crescent plate to the center direction, until first inclined plane intercommunication second oil collecting groove, two elastic sealing components are located in two second oil collecting groove respectively, the utility model discloses have the advantages such as improving volumetric efficiency, reducing noise, prolonging service life.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive suspension systems, specifically relating to a high-pressure internal meshing gear pump. Background Technology

[0002] High-pressure internal gear pumps are mainly used in automotive suspension systems and can be integrated with motors and controllers to form suspension electronic oil pump assemblies. These pumps are bidirectional, capable of bidirectional rotation (the inlet and outlet directions can be interchanged depending on the rotation direction of the internal gear). Their core structure includes an internal gear, an external gear, and a crescent plate assembly. During operation, only the oil near the outlet area experiences higher pressure, which forces the upper and lower crescent plates apart. To prevent the upper and lower crescent plates from tilting upwards on one side, existing equipment separates the upper crescent plate at both ends, allowing the side closer to the outlet to operate while the side closer to the inlet remains inactive. Because the separate upper crescent plates are smaller, the side closer to the outlet is more easily pushed by the oil, ensuring proper contact with the external gear and the lower crescent plate with the internal gear. However, since the upper pressure plate is a split type, the upper pressure plate near the oil inlet will shake during operation, causing it to collide with the lower pressure plate and the external gear, generating noise and reducing service life. In order to solve this problem, a high-pressure internal meshing gear pump is proposed. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, this utility model proposes a high-pressure internal gear pump, which has the advantages of improving volumetric efficiency, reducing noise, and extending service life.

[0005] According to an embodiment of the present invention, a high-pressure internal gear pump includes: a compensation component located inside an external gear and disposed between the external gear and an internal gear, the compensation component being used to compensate for the clearance between itself and the external gear and the internal gear; the compensation component includes: an upper crescent plate, a lower crescent plate, and two elastic sealing components, the upper crescent plate and the lower crescent plate being slidably connected to the interior of the external gear along the radial direction of the external gear; a first oil collection groove and a second oil collection groove are sequentially formed from two ends toward the center on the side of the upper crescent plate facing the lower crescent plate, the two ends of the upper crescent plate being centrally symmetrical, and a first inclined surface being formed on two edges on the side of the upper crescent plate facing the lower crescent plate, the first inclined surface extending from the end of the upper crescent plate toward the center until the first inclined surface connects to the second oil collection groove; the two elastic sealing components are respectively located in the two second oil collection grooves, and are used to seal the clearance between the upper crescent plate and the lower crescent plate at a position near the center of the upper crescent plate in the second oil collection groove.

[0006] According to one embodiment of the present invention, the elastic sealing assembly includes an elastic element and a sealing rod; a second inclined surface is formed on the edge of the second oil collection groove near the center of the upper crescent plate, a protrusion is formed on the side of the lower crescent plate facing the upper crescent plate, and a third inclined surface is formed on the edges at both ends of the protrusion. The two third inclined surfaces and the two second inclined surfaces correspond one-to-one, and the corresponding third inclined surfaces and second inclined surfaces are arranged opposite to each other. The elastic element is used to push the sealing rod towards the second inclined surface and the third inclined surface, so that the second inclined surface and the third inclined surface are in contact with the circumferential surface of the sealing rod.

[0007] According to one embodiment of the present invention, the elastic element is installed on the side of the second oil collection groove away from the center of the upper crescent plate.

[0008] According to one embodiment of the present invention, the elastic element is a support spring.

[0009] According to one embodiment of the present invention, the inner depth of the first oil collecting groove is consistent.

[0010] According to one embodiment of the present invention, a first positioning groove is formed at both the front and rear ends of the upper crescent plate, and a second positioning groove is formed at both the front and rear ends of the lower crescent plate. The two first positioning grooves and the two second positioning grooves correspond one-to-one, and the corresponding first positioning grooves and second positioning grooves are sequentially opened along the radial direction of the external gear. The width of the corresponding first positioning grooves and second positioning grooves gradually decreases along the radial direction of the external gear.

[0011] According to one embodiment of the present invention, the first positioning groove is located on the axis of symmetry of the upper crescent plate, and the second positioning groove is located on the axis of symmetry of the lower crescent plate.

[0012] According to one embodiment of the present invention, it further includes two distribution plates, which are located at the front and rear ends of the external gear. Each of the two distribution plates is provided with a positioning pin, which slides in the first positioning groove and the second positioning groove to limit the upper crescent plate and the lower crescent plate.

[0013] According to one embodiment of the present invention, the length of the first oil collecting groove is not less than the tooth pitch of the external gear, and the sum of the lengths of the first oil collecting groove and the second oil collecting groove is greater than two-fifths of the length of the upper crescent plate.

[0014] According to one embodiment of the present invention, the distance from the second oil collecting groove to the center of the upper crescent plate is not less than 1.5 times the tooth pitch of the external gear, and the distance from the center of the second oil collecting groove to the first oil collecting groove is not less than the tooth pitch of the external gear.

[0015] The beneficial effects of this utility model are that it adopts a first oil collecting groove and a second oil collecting groove on the upper crescent plate, and the first inclined surface is opened from the end of the upper crescent plate to the second oil collecting groove, so that oil can be supplied to the first oil collecting groove and the second oil collecting groove at the same time. This allows the first oil collecting groove and the second oil collecting groove to separate the upper crescent plate and the lower crescent plate at the same time, achieving uniform separation of the upper crescent plate and avoiding the phenomenon of edge warping. At the same time, it eliminates the need to separate the upper crescent plate, thus ensuring the stability of the upper crescent plate, avoiding the impact phenomenon of the upper crescent plate near the oil inlet, reducing noise, and improving service life.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which:

[0019] Figure 1 This is a front view schematic diagram of the structure of the compensation component, external gear and internal gear of this utility model after they are installed in the pump body;

[0020] Figure 2 This is a schematic diagram of the main structure of the gear pump of this utility model;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of area A of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of section B of this utility model after rotating it by 90°;

[0023] Figure 5 This is a partial three-dimensional cross-sectional view of the compensation component, external gear, and internal gear of this utility model after assembly;

[0024] Figure 6 This is an enlarged schematic diagram of area C of this utility model;

[0025] Figure 7 This is a schematic diagram showing the disassembled structure of the gear pump of this utility model;

[0026] Figure 8 This is an enlarged schematic diagram of region D of this utility model;

[0027] Figure label:

[0028] 1. Pump cover; 2. Pump body; 3. First inclined surface; 5. Distribution plate; 6. Positioning pin; 7. Upper crescent plate; 72. First oil collection groove; 73. Second oil collection groove; 74. First positioning groove; 8. Lower crescent plate; 81. Second positioning groove; 13. Internal gear; 14. External gear; 15. Elastic washer; 16. Sealing rod; 17. Elastic element. Detailed Implementation

[0029] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 this utility model based on the specific circumstances.

[0032] The high-pressure internal gear pump of this utility model is described in detail below with reference to the accompanying drawings.

[0033] like Figure 1-8As shown, the high-pressure internal gear pump according to an embodiment of the present invention includes: a compensation assembly, which is located inside the external gear 14 and disposed between the external gear 14 and the internal gear 13, and is used to compensate for the gap between itself and the external gear 14 and the internal gear 13; the compensation assembly includes: an upper crescent plate 7, a lower crescent plate 8 and two elastic sealing assemblies, the upper crescent plate 7 and the lower crescent plate 8 being sequentially slidably connected to the inside of the external gear 14 along the radial direction of the external gear 14; the side of the upper crescent plate 7 facing the lower crescent plate 8 having a first oil collecting groove 72 and a second oil collecting groove 72 sequentially formed from the two ends toward the center. The oil groove 73 has two ends of the upper crescent plate 7 that are centrally symmetrical. The two edges of the upper crescent plate 7 facing the lower crescent plate 8 have a first inclined surface 3. The first inclined surface 3 extends from the end of the upper crescent plate 7 toward the center until it connects to the second oil collection groove 73. That is, the first inclined surface 3 extends from the end of the upper crescent plate 7 toward the center, passes through the first oil collection groove 72, and then connects to the second oil collection groove 73. Two elastic sealing components are located in the two second oil collection grooves 73 respectively, and are used to seal the gap between the upper crescent plate 7 and the lower crescent plate 8 in the second oil collection groove 73 near the center of the upper crescent plate 7.

[0034] In this embodiment, the high-pressure internal gear pump further includes a pump body 2, a pump cover 1, and two distribution plates 5. A cylindrical cavity is formed inside the pump body 2. The external gear 14 is mounted in the cylindrical cavity through a first bearing to achieve a rotatable connection between the external gear 14 and the pump body 2. The two distribution plates 5 are respectively located at the front and rear ends of the external gear 14 to form a sealed space together with the external gear 14. The compensation component and the internal gear 13 are both located in this sealed space. The external gear 14 is annular and has multiple first teeth inside. The multiple first teeth are evenly arranged along the circumference of the external gear 14. The outer surface of the internal gear 13 has multiple second teeth formed along the circumference. The diameter of the internal gear 13 is smaller than that of the external gear 14. The upper surface of the upper crescent plate 7 is in contact with the tip of the first tooth of the upper part of the external gear 14; the lower surface of the lower crescent plate 8 is in contact with the tip of the second tooth of the upper part of the internal gear 13, and the second tooth of the lower part of the internal gear 13 meshes with the first tooth of the lower part of the internal gear 13. In the non-operating state, the lower surface of the upper crescent plate 7 and the upper surface of the lower crescent plate 8 are in contact; thus, the upper crescent plate 7, the lower crescent plate 8 and the internal gear 13 divide the interior of the external gear 14 into two spaces; an oil inlet and an oil outlet are formed on the distribution plate 5, and the oil inlet and the oil outlet are located in the two spaces mentioned above, which are referred to as the oil inlet space and the oil outlet space for ease of understanding. The oil entering through the inlet is carried to the outlet space by the rotation of the internal gear 13 and the external gear 14. As the internal and external gears rotate, the amount of oil in the outlet space increases, thus increasing the pressure within the space, before being discharged from the outlet. The first inclined surface 3 creates a first channel between the upper crescent plate 7 and the distribution plate 5. During the process of oil entering the outlet space, some oil in the outlet space enters the first oil collecting tank 72 and the second oil collecting tank 73 through the first channel near the outlet space. As the pressure in the outlet space increases, the amount of oil entering the first and second oil collecting tanks 72 and 73 also increases, causing the upper crescent plate 7 and the lower crescent plate 8 to separate near the outlet space. At this time, due to the elastic seal, the upper crescent plate 7 and the lower crescent plate 8 remain sealed at the position near the center of the upper crescent plate 7 in the second oil collecting tank 73; while the separated upper crescent plate 7 and lower crescent plate 8... The crescent plates 8 press against the internal gear 13 and the external gear 14 respectively to improve the fit between the upper crescent plate 7 and the external gear 14, as well as the fit between the internal gear 13 and the lower crescent plate 8. During this process, the upper crescent plate 7 and the lower crescent plate 8 are both pressed in the first oil collection groove 72 and the second oil collection groove 73, causing them to separate. This avoids the phenomenon of the upper crescent plate 7 and the lower crescent plate 8 tilting up on one side, and achieves the separation of the upper crescent plate 7 and the lower crescent plate 8 along the radial direction of the external gear 14. This ensures the contact area between the upper crescent plate 7 and the first tooth and the contact area between the lower crescent plate 8 and the first tooth, and prevents the oil in the oil outlet space from flowing back into the oil inlet space.By opening the first inclined surface 3 to the second oil collection groove 73, the upper crescent plate 7 and the lower crescent plate 8 are separated by translation, avoiding the phenomenon of warping, ensuring the uniformity of separation of the upper crescent plate 7 and the lower crescent plate 8, eliminating the need for the upper crescent plate 7 to be a separate unit, improving the convenience of installation, and avoiding the phenomenon of impact on the upper crescent plate 7 at the oil inlet space, thus reducing noise and improving service life.

[0035] The resilient sealing assembly includes an elastic element 17 and a sealing rod 16. A second inclined surface is formed on the edge of the second oil collection groove 73 near the center of the upper crescent plate 7. A protrusion is formed on the side of the lower crescent plate 8 facing the upper crescent plate 7. Third inclined surfaces are formed on the edges at both ends of the protrusion. The two third inclined surfaces correspond one-to-one with the two second inclined surfaces, and the corresponding third and second inclined surfaces are arranged opposite each other. That is, in the area between the two second inclined surfaces, the area of ​​the upper crescent plate 7 facing the lower crescent plate 8 is a concave area to ensure the fit between the two ends of the lower crescent plate 8 and the upper crescent plate 7 when not in operation. The elastic element 17 is used to push the sealing rod 16 towards the second and third inclined surfaces, so that both the second and third inclined surfaces contact the circumferential surface of the sealing rod 16. The elastic element 17 is installed on the side of the second oil collection groove 73 away from the center of the upper crescent plate 7. The elastic element 17 is a support spring.

[0036] In this embodiment, the sealing rod 16 is cylindrical, and the corresponding second and third inclined surfaces are centrally symmetrical. The opening size of the second and third inclined surfaces gradually decreases towards the center along the end of the upper crescent plate 7. The elastic element 17 is used to push the sealing rod 16 along the central axis of the second and third inclined surfaces. Specifically, the two sealing rods 16 move in a direction close to the circumference of the external gear 14, so that the sealing rod 16 exerts a thrust perpendicular to the second and third inclined surfaces. Under the action of the two elastic elements 17, the upper crescent plate 7 and the lower crescent plate 8 are separated under the common thrust at both ends, so that the upper crescent plate 7 and the lower crescent plate 8 respectively fit the external gear 14 and the internal gear 13. Since the elastic element 17 is a supporting spring, the sealing rod 16 moves only in one direction, avoiding the phenomenon of tilting or offset of the sealing rod 16 and ensuring the fit between the sealing rod 16 and the second and third inclined surfaces. Furthermore, since the elastic element 17 pushes the sealing rod 16 along the central axis of the second and third inclined surfaces, after the oil enters the second oil collection tank 73, it generates thrust in all directions within the second oil collection tank 73. The force pushing the sealing rod 16 is in the same direction as the thrust of the elastic element 17. Therefore, the oil assists the elastic element 17 in pushing the sealing rod 16 towards the second and third inclined surfaces. While ensuring that the elastic element 17 is in close contact with the second and third inclined surfaces, the second and third inclined surfaces are further separated by the thrust of the sealing rod 16. This increases the separation force at the center of the upper crescent plate 7 and the lower crescent plate 8, making the separation of the upper crescent plate 7 and the lower crescent plate 8 more uniform.

[0037] The concave depth of the first oil collecting groove 72 is consistent, meaning that the distance from each point on the inner surface of the first oil collecting groove 72 to the lower crescent plate 8 is the same. This ensures that the force is uniform after the oil enters the first oil collecting groove 72, thereby guaranteeing the uniformity of the separation between the upper crescent plate 7 and the lower crescent plate 8.

[0038] The upper crescent plate 7 has a first positioning groove 74 formed at both the front and rear ends, and the lower crescent plate 8 has a second positioning groove 81 formed at both the front and rear ends. The two first positioning grooves 74 and the two second positioning grooves 81 correspond one-to-one, and the corresponding first positioning grooves 74 and second positioning grooves 81 are opened sequentially along the radial direction of the external gear 14. The width of the corresponding first positioning grooves 74 and second positioning grooves 81 gradually decreases along the radial direction of the external gear 14.

[0039] The first positioning groove 74 is located on the axis of symmetry of the upper crescent plate 7, and the second positioning groove 81 is located on the axis of symmetry of the lower crescent plate 8.

[0040] Both distribution plates 5 are provided with positioning pins 6, which slide in the first positioning groove 74 and the second positioning groove 81 to limit the upper crescent plate 7 and the lower crescent plate 8.

[0041] In this embodiment, one end of the positioning pin 6 has a structure consistent with the combined structure of the first positioning groove 74 and the second positioning groove 81. After being inserted into the first positioning groove 74 and the second positioning groove 81, it limits the movement of the upper crescent plate 7 and the lower crescent plate 8, preventing them from rotating with the rotation of the internal gear 13 and the external gear 14, thus maintaining their stability. The width of one end of the positioning pin 6 is slightly smaller than the dimensions of the first positioning groove 74 and the second positioning groove 81 to facilitate the vertical movement of the upper crescent plate 7 and the lower crescent plate 8.

[0042] Furthermore, two positioning pins 6 are fixed to the opposite surfaces of the pump body 2 and the pump cover 1, respectively. Positioning holes through the positioning pins 6 are formed on both distribution plates 5, and the two distribution plates 5 are positioned by the positioning pins 6.

[0043] The length of the first oil collection groove 72 is not less than the tooth pitch of the external gear 14, and the sum of the lengths of the first oil collection groove 72 and the second oil collection groove 73 is greater than two-fifths of the length of the upper crescent plate 7.

[0044] The distance from the center of the second oil collection groove 73 to the center of the upper crescent plate 7 shall not be less than 1.5 times the tooth pitch of the external gear 14, and the distance from the center of the second oil collection groove 73 to the first oil collection groove 72 shall not be less than the tooth pitch of the external gear 14.

[0045] In other words, the sum of the arc lengths of the first oil collecting groove 72 and the second oil collecting groove 73 on one side of the upper crescent plate 7 is greater than two-fifths of half the length of the upper crescent plate 7. Furthermore, the first oil collecting groove 72 and the second oil collecting groove 73 are spaced apart. Therefore, when the oil in the first oil collecting groove 72 and the second oil collecting groove 73 separates the upper crescent plate 7 and the lower crescent plate 8, it disperses the thrust on the upper crescent plate 7 and the lower crescent plate 8, ensuring uniform separation and further reducing edge warping. By setting the length of the first oil collecting groove 72 to be no less than the tooth pitch of the external gear 14, when one of the first teeth a is about to leave the first oil collecting groove 72, the other first tooth b adjacent to that first tooth a begins to contact the first oil collecting groove 72, achieving a double sealing effect through the first oil collecting groove 72.

[0046] The widths of the internal gear 13, external gear 14, upper crescent plate 7, lower crescent plate 8, and sealing rod 16 are consistent. The two ends of the internal gear 13, external gear 14, upper crescent plate 7, lower crescent plate 8, and sealing rod 16 respectively contact the end faces of the two distribution plates 5. Annular grooves are provided on the opposing surfaces of the pump body 2 and pump cover 1. Elastic washers 15 are provided within the annular grooves, protruding from them. One end of the annular groove abuts against the inner surface of the groove, and the other end abuts against the corresponding distribution plate 5. At this time, the elastic washers 15 are in a compressed state. When a gap is created between the distribution plate 5 and the internal gear 13, external gear 14, upper crescent plate 7, lower crescent plate 8, and sealing rod 16, the thrust of the elastic washers 15 will cause the distribution plate 5 to adhere to the internal gear 13, external gear 14, upper crescent plate 7, lower crescent plate 8, and sealing rod 16, thus compensating for the gap and ensuring volumetric efficiency.

[0047] The pump body 2 and pump cover 1 are fixed together with bolts. The pump cover 1 has mounting holes along the central axis of the internal gear 13, and the pump body 2 has through holes along the central axis of the internal gear 13. Both the mounting holes and through holes are used to mount the drive shaft. One end of the drive shaft is fixedly connected to a motor, and the other end passes through the through hole and the internal gear 13, with a bearing connected to the mounting hole. The circumferential surface of the drive shaft has splines or polygonal flat bars. These splines or polygonal flat bars are inserted into the interior of the internal gear 13 and mesh with its inner surface, driving the internal gear 13 to rotate via the motor. The motor is fixedly mounted on the outside of the pump body 2 and is a bidirectional motor, capable of driving the internal gear 13 to rotate in either the forward or reverse direction. Two second bearings are fitted onto the drive shaft, connecting the pump cover 1 and the pump body 2 respectively.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present 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.

[0049] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-pressure internal gear pump, characterized in that, include: The compensation component is located inside the external gear (14) and between the external gear (14) and the internal gear (13). The compensation component is used to compensate for the gap between itself and the external gear (14) and the internal gear (13). The compensation assembly includes an upper crescent plate (7), a lower crescent plate (8), and two elastic sealing components. The upper crescent plate (7) and the lower crescent plate (8) are sequentially slidably connected to the interior of the external gear (14) along the radial direction of the external gear (14). On the side of the upper crescent plate (7) facing the lower crescent plate (8), a first oil collection groove (72) and a second oil collection groove (73) are sequentially formed from the two ends toward the center. The two ends of the upper crescent plate (7) are centrally symmetrical. The toothed plate (7) has two edges on the side facing the lower crescent plate (8) with a first inclined surface (3). The first inclined surface (3) extends from the end of the upper crescent plate (7) toward the center until the first inclined surface (3) connects to the second oil collection groove (73). The two elastic sealing components are respectively located in the two second oil collection grooves (73) and are used to seal the gap between the upper crescent plate (7) and the lower crescent plate (8) in the second oil collection groove (73) near the center of the upper crescent plate (7).

2. The high-pressure internal gear pump according to claim 1, characterized in that, The elastic sealing assembly includes an elastic element (17) and a sealing rod (16); a second inclined surface is formed on the edge of the second oil collection groove (73) near the center of the upper crescent plate (7), a protrusion is formed on the side of the lower crescent plate (8) facing the upper crescent plate (7), and a third inclined surface is formed on the edges at both ends of the protrusion. The two third inclined surfaces and the two second inclined surfaces correspond one-to-one, and the corresponding third inclined surfaces and second inclined surfaces are arranged opposite to each other. The elastic element (17) is used to push the sealing rod (16) towards the second and third inclined surfaces, so that the second and third inclined surfaces are in contact with the circumferential surface of the sealing rod (16).

3. The high-pressure internal gear pump according to claim 2, characterized in that, The elastic element (17) is installed on the side of the second oil collection tank (73) away from the center of the upper crescent plate (7).

4. The high-pressure internal gear pump according to claim 3, characterized in that, The elastic element (17) is a support spring.

5. The high-pressure internal gear pump according to claim 4, characterized in that, The inner depth of the first oil collection groove (72) is consistent.

6. The high-pressure internal gear pump according to claim 5, characterized in that, The upper crescent plate (7) has a first positioning groove (74) formed at both the front and rear ends, and the lower crescent plate (8) has a second positioning groove (81) formed at both the front and rear ends. The two first positioning grooves (74) and the two second positioning grooves (81) correspond one-to-one, and the corresponding first positioning grooves (74) and second positioning grooves (81) are opened sequentially along the radial direction of the external gear (14). The width of the corresponding first positioning grooves (74) and second positioning grooves (81) gradually decreases along the radial direction of the external gear (14).

7. The high-pressure internal gear pump according to claim 6, characterized in that, The first positioning groove (74) is located on the axis of symmetry of the upper crescent plate (7), and the second positioning groove (81) is located on the axis of symmetry of the lower crescent plate (8).

8. The high-pressure internal gear pump according to claim 7, characterized in that, It also includes two distribution plates (5), which are located at the front and rear ends of the external gear (14). Each of the two distribution plates (5) is provided with a positioning pin (6), which slides in the first positioning groove (74) and the second positioning groove (81) to limit the upper crescent plate (7) and the lower crescent plate (8).

9. The high-pressure internal gear pump according to claim 8, characterized in that, The length of the first oil collection groove (72) is not less than the pitch of the external gear (14), and the sum of the lengths of the first oil collection groove (72) and the second oil collection groove (73) is greater than two-fifths of the length of the upper crescent plate (7).

10. The high-pressure internal gear pump according to claim 9, characterized in that, The distance from the second oil collection groove (73) to the center of the upper crescent plate (7) is not less than 1.5 times the tooth pitch of the external gear (14), and the distance from the center of the second oil collection groove (73) to the first oil collection groove (72) is not less than the tooth pitch of the external gear (14).

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