A concentric body servo energy-saving high-pressure internal gear pump

Abstract

A concentric body servo energy-saving high-pressure internal gear pump includes a pump body, the pump body includes a front cover, a rear cover and a body arranged between the front cover and the rear cover, the center of the body is coaxially provided with an annular chamber; a drive assembly, including an inner gear ring rotatably arranged in the chamber, and a drive shaft rotatably arranged in the inner gear ring, the inner gear ring and the chamber are coaxially arranged, the drive shaft has an outer gear portion, the outer gear portion is partially meshed with the inner gear ring, and the axis of the drive shaft is eccentrically arranged with the body; a pressure retainer assembly is arranged between the inner gear ring and the outer gear portion. When the present invention is heated and deformed, the concentric body can be heated and deformed uniformly in the direction of concentric circles, so that the chamber maintains good roundness, and the inner gear ring and the chamber have good coaxiality, so that the wear phenomenon will not occur due to the misalignment of the body and the inner gear ring, causing damage to the oil pump, thereby improving the service life of the oil pump and the output of a certain flow and pressure.

Description

Technical Field

[0001] The invention relates to the technical field of gear pumps, and in particular to a concentric body servo energy-saving high-pressure internal gear pump. Background Art

[0002] like Figure 1 As shown, a conventional gear pump utilizes a power source (e.g., a motor) to drive an outer gear shaft 1, and then utilizes the partial meshing relationship between the outer gear shaft 1 and the inner gear ring 2 to drive the inner gear ring 2 to rotate synchronously. During the rotation of the two, a fluid (e.g., hydraulic oil) can be sucked into a chamber 4 of a body 3 from an oil inlet H1, and then the pressurized fluid is discharged from the chamber 4 from an oil outlet H2. In addition, a pressure component 5 is used to divide the chamber 4 into a high-pressure chamber and a low-pressure chamber, and radial pressure compensation is formed for the fluid, thereby forming a nearly gapless sealing state between the outer gear shaft 1, the inner gear ring 2, and the pressure component 5.

[0003] However, in the structure of the conventional technology, the outer gear shaft 1 and the body 3 are coaxially designed, while the chamber 4 and the inner gear ring 2 are eccentrically designed. Because the chamber 4 is eccentric, the wall thickness of the body 3 is uneven, with one side thin and the other thick. In this case, the body 3 gradually heats up under the continuous operation of the oil pump, and causes the thermal expansion deformation of the body 3. Since the body 3 is not designed as a concentric circle, the body 3 deforms into a non-true circle when it is heated and deformed. Especially under high speed and high pressure, the deformation is greater, and the coaxiality of the body 3 and the inner gear ring 2 is lost, which causes the wear of the first high-pressure barrier area 7A and the second high-pressure barrier area 7B in the chamber 4, and then causes the high-pressure fluid in the high-pressure chamber to leak its high-pressure fluid from the damaged first high-pressure barrier area 7A and the second high-pressure barrier area 7B, which will cause the high-pressure fluid in the high-pressure oil tank 6 to experience a sudden drop in pressure and flow loss, and the oil pump loses its efficiency. Therefore, it is necessary to design a better internal gear pump to solve the above problems. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a concentric body servo energy-saving high-pressure internal gear pump with good sealing performance, improved oil pump service life and stable flow and pressure output.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A concentric body servo energy-saving high-pressure internal gear pump, comprising:

[0007] A pump body, the pump body comprising a front cover, a rear cover and a body disposed between the front cover and the rear cover, the front cover being provided with an oil inlet, the rear cover being provided with an oil outlet, an annular chamber being coaxially disposed at the center of the body, the chamber being in communication with the oil inlet and the oil outlet;

[0008] a drive assembly, comprising an inner gear ring rotatably disposed in the chamber, and a drive shaft rotatably disposed in the inner gear ring, the inner gear ring and the chamber are coaxially disposed, the drive shaft has an outer tooth portion, the outer tooth portion is partially meshed with the inner gear ring, and the axis of the drive shaft is eccentrically disposed with respect to the body;

[0009] A pressure retainer assembly is disposed between the inner gear ring and the outer gear portion.

[0010] Furthermore, a driving portion is provided at one end of the driving shaft and protrudes out of the front cover.

[0011] Furthermore, the front cover is provided with an oil inlet channel connected to the oil inlet port, and the rear cover is provided with an oil outlet channel connected to the oil outlet port, the oil inlet channel and the oil outlet channel are both axially parallel to the drive shaft, and the oil inlet channel, the oil outlet channel and the drive shaft are located on different axes.

[0012] Further, the oil inlet is perpendicular to the oil inlet channel, or / and the oil outlet is perpendicular to the oil outlet channel.

[0013] Furthermore, the oil inlet and the oil outlet are located on the same side of the pump body.

[0014] Furthermore, the body is circular or square, and the surfaces of the front cover and the rear cover facing the body are provided with convex rings, and the two ends of the chamber are sleeved on the convex rings.

[0015] Furthermore, the pressure retainer assembly includes a crescent-shaped pressure retainer main piece and an arc-shaped pressure retainer auxiliary piece, the outer peripheral surface of the pressure retainer main piece is provided with a receiving groove, the pressure retainer auxiliary piece is arranged in the receiving groove, and a pressure-guiding groove is formed between the pressure retainer auxiliary piece and the pressure retainer main piece, and the pressure retainer main piece is concavely provided with a first spring plate groove and a second spring plate groove at the edge of the receiving groove, which are respectively used to accommodate a first spring plate and a second spring plate, the first spring plate abuts against the pressure retainer auxiliary piece, the second spring plate abuts against a pressure-maintaining rod located in the second spring plate groove, and the pressure-maintaining rod abuts against the pressure retainer auxiliary piece, so that the pressure-maintaining rod is abutted by the second spring plate to push the pressure retainer auxiliary piece toward the tooth portion of the inner gear ring.

[0016] Furthermore, pressure-retaining side plates are provided on the front and rear sides of the main plate of the pressure retainer, and an embedding groove is respectively provided on the front and rear sides of the main plate of the pressure retainer, and an overhead column is provided in the embedding groove, one end of the overhead column is located in the embedding groove, and the other end passes through the pressure-retaining side plate and is fixed to the front cover or the rear cover.

[0017] Furthermore, a retaining wall is provided between the embedding groove and the containing groove, and one end of the pressure retainer sub-piece abuts against the retaining wall.

[0018] Further, the pressure retainer assembly includes an overhead shaft, the two ends of the overhead shaft are fixed to the front cover and the rear cover, the outer periphery of the overhead shaft is provided with a recessed portion, a crescent-shaped pressure retainer main sheet is partially accommodated in the recessed portion, the inner peripheral surface of the pressure retainer main sheet abuts against the overhead shaft, the outer peripheral surface is provided with a receiving groove, a pressure retainer secondary sheet is accommodated in the receiving groove, one end of the pressure retainer secondary sheet abuts against the recessed portion, a pressure guiding groove is formed between the pressure retainer secondary sheet and the pressure retainer main sheet, the pressure retainer main sheet is concavely provided with a first spring sheet groove and a second spring sheet groove in the edge of the receiving groove, respectively used to accommodate a first spring sheet and a second spring sheet, the first spring sheet abuts against the pressure retainer secondary sheet, the second spring sheet abuts against a pressure-maintaining rod located in the second spring sheet groove, and the pressure-maintaining rod abuts against the pressure retainer secondary sheet, so that the pressure-maintaining rod is abutted by the second spring sheet and pushes the pressure retainer secondary sheet toward the tooth portion of the inner gear ring.

[0019] Beneficial effects of the present invention:

[0020] The annular chamber in the concentric body of the present invention is coaxially arranged with the body, so when the temperature rises and thermal deformation occurs, the concentric body can be uniformly heated and deformed in a concentric direction, so that the chamber maintains good true roundness, and the inner gear ring and the chamber have good coaxiality. Therefore, the concentric body can maintain coaxial operation during the rotation of the inner gear ring, and will not cause wear due to the misalignment of the concentric body and the inner gear ring, causing damage to the oil pump, thereby improving the service life of the oil pump and the output of a certain flow rate and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A radial cross-sectional view of a conventional gear pump in the background art;

[0022] Figure 2 A three-dimensional diagram of a concentric body servo energy-saving high-pressure internal gear pump according to a first embodiment of the present invention;

[0023] Figure 3 It is a three-dimensional exploded view of a concentric body servo energy-saving high-pressure internal gear pump according to the first embodiment of the present invention;

[0024] Figure 4 It is an axial cross-sectional view of a concentric body servo energy-saving high-pressure internal gear pump according to the first embodiment of the present invention;

[0025] Figure 5 It is an axial cross-sectional view from another perspective of the concentric body servo energy-saving high-pressure internal gear pump of the first embodiment of the present invention;

[0026] Figure 6 A radial cross-sectional view of a concentric body servo energy-saving high-pressure internal gear pump according to a first embodiment of the present invention;

[0027] Figure 7 It is a three-dimensional exploded view of a pressure retainer assembly in a concentric body servo energy-saving high-pressure internal gear pump according to the first embodiment of the present invention;

[0028] Figure 8 It is a perspective exploded view of a pressure retainer assembly in a concentric body high pressure internal gear pump according to a second embodiment of the present invention;

[0029] Fig. 9 A radial cross-sectional view of a concentric body servo energy-saving high-pressure internal gear pump according to a third embodiment of the present invention;

[0030] In the figure, 1 is an outer gear shaft, 2 is an inner gear ring, 3 is a main body, 4 is a chamber, 5 is a pressure retainer assembly, 6 is a high-pressure oil groove, 7A is a first high-pressure barrier area, 7B is a second high-pressure barrier area, H1 is an oil inlet, H2 is an oil outlet, 10 is an inner gear pump, 20 is a pump body, 21 is a front cover, 212 is an oil inlet, 214 is an oil inlet channel, 216 is a convex ring, 22 is a rear cover, 221 is an oil outlet, 223 is an oil outlet channel, 23 is a main body, 232 is a chamber, 24 is a bolt, 25 is a first shaft hole, 26 is a second shaft hole, 27 is a positioning pin, 28 is a first pin hole, 29 is a second Pin hole, 30—driving assembly, 32—inner gear ring, 34—driving shaft, 342—external gear portion, 344—driving portion, 35—sliding bearing, 40—pressure retainer assembly, 41—pressure retainer positive plate, 411—receiving groove, 412—first spring plate groove, 413—second spring plate groove, 414—embedded groove, 415—retaining wall, 42—pressure retainer auxiliary plate, 43—first spring plate, 44—second spring plate, 45—pressure retaining rod, 46—pressure retaining side plate, 47—top column, 48—back support ring, 49—back support ring oil seal, 50—pressure guide groove, 60—top shaft, 61—recessed portion. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] like Figure 2 and Figure 3 A first embodiment of the present invention provides a concentric body high pressure internal gear pump 10 , including a pump body 20 , a drive assembly 30 and a pressure retainer assembly 40 .

[0035] The pump body 20 includes a front cover 21, a rear cover 22 and a body 23 disposed between the front cover 21 and the rear cover 22. The outer periphery of the body 23 can be circular or square. An annular chamber 232 is coaxially arranged at the center of the body 23, that is, the cross section of the chamber 232 is circular. In this embodiment, the body 23 is annular, and the annular body 23 is designed to be concentric with the chamber 232. The four ends of the front cover 21 and the rear cover 22 are fixed together by four bolts 24. The surfaces of the front cover 21 and the rear cover 22 facing the body are convexly provided with a convex ring 216, and the two ends of the chamber 232 are sleeved on the convex ring 216, so as to realize the radial positioning of the front cover 21, the body 23 and the rear cover 22. The rear side surface of the front cover 21 and the front side surface of the rear cover 22 are provided with a first axial hole 25 and a second axial hole 26 located on one side of the first axial hole 25. The front and rear end faces of the main body 23 are respectively provided with a first pin hole 28, and the rear end face of the front cover 21 and the front end face of the rear cover 22 are respectively provided with a second pin hole 29 at positions corresponding to the first pin hole 28. The positioning pin 27 is inserted into the first pin hole 28 and the second pin hole 29 to realize the axial positioning between the main body 23 and the front cover 21 and the rear cover 22, thereby fixing the main body 23 between the front cover 21 and the rear cover 22.

[0036] like Figures 3 to 5The front cover 21 is provided with an oil inlet 212 extending straight downward from its top surface, and the front cover 21 has an oil inlet passage 214 inside, and the front end of the oil inlet passage 214 is vertically connected to the bottom end of the oil inlet 212. The rear cover 22 has an oil outlet 221 extending straight downward from its top surface, and the rear cover 22 has an oil outlet passage 223 inside, and the rear end of the oil outlet passage 223 is vertically connected to the bottom end of the oil outlet 221. Thus, the oil inlet 212 and the oil outlet 221 are located on the same side of the pump body 20, and the oil inlet passage 214 and the oil outlet passage 223 are axially parallel and located on different axes. The rear end of the oil inlet channel 214 and the front end of the oil outlet channel 223 are connected to the chamber 232. Therefore, when the fluid is sucked into the chamber 232 from the oil inlet port 212 through the oil inlet channel 214 or discharged from the chamber 232 to the oil outlet port 221 through the oil outlet channel 223, no turbulent flow obstruction will be formed. Introducing or exporting the fluid in a parallel manner can make the fluid flow out in large quantities and quickly, effectively improving the smoothness of the fluid delivery.

[0037] like Figures 3 to 6 The drive assembly 30 includes an inner gear ring 32 rotatably disposed in the chamber 232, and a drive shaft 34 rotatably disposed in the inner gear ring 32. The drive shaft 34 is disposed in the chamber 232 and is sleeved with a sliding bearing 35 at both ends, so that the drive shaft 34 can rotate in the inner gear ring 32, and the sliding bearing 35 is accommodated in the first shaft hole 25. The axial direction of the drive shaft 34 is parallel to the oil inlet channel 214 and the oil outlet channel 223, and the oil inlet channel 214, the oil outlet channel 223 and the drive shaft 34 are located on different axes. In this embodiment, the oil inlet channel 214 and the oil outlet channel 223 are respectively located on both sides of the drive shaft 34. One end of the drive shaft 34 has an outer tooth portion 342, and the drive shaft 34 partially engages with the inner gear ring 32 through the outer tooth portion 342. The other end of the drive shaft 34 has a drive portion 344 protruding from the front cover 21. The drive shaft 34 is connected to a drive source (such as a motor, not shown in the figure) through the drive portion 344. The drive shaft 34 is driven to rotate by the drive source, and the outer tooth portion 342 engages with the inner gear ring 32, driving the inner gear ring 32 to rotate.

[0038] In the present invention, the inner gear ring 32 is coaxially arranged with the chamber 232, and the axis of the drive shaft 34 is eccentrically arranged with the body 23. When the body 23 gradually heats up under the continuous operation of the oil pump, resulting in thermal expansion deformation of the body 23, since the annular chamber 232 of the present invention is coaxially arranged with the body 23, the body 23 can be uniformly heated and deformed in a concentric circle direction during the heating and thermal deformation, so that the chamber 232 maintains a good roundness, and the inner gear ring 32 and the chamber 232 have a good coaxiality. Therefore, the body 23 can maintain coaxial operation during the rotation of the inner gear ring 32, and will not cause wear due to the different axes of the body 23 and the inner gear ring 32, causing damage to the oil pump, thereby improving the service life of the oil pump and the output of a certain flow rate and pressure.

[0039] like Figure 3 , Figure 6 and Figure 7 The pressure retainer assembly 40 is arranged between the inner gear ring 32 and the outer gear portion 342 of the driving shaft 34 to provide a pressure compensation effect. In this embodiment, the pressure retainer assembly 40 includes a crescent-shaped pressure retainer main piece 41 and an arc-shaped pressure retainer secondary piece 42. The outer peripheral surface of the pressure retainer main piece 41 is provided with a receiving groove 411. The pressure retainer secondary piece 42 is arranged in the receiving groove 411. A pressure guide groove 50 is formed between the pressure retainer secondary piece 42 and the pressure retainer main piece 41. The pressure retainer main piece 41 is concavely provided with a first spring plate groove 412 and a second spring plate groove 413 at the edge of the receiving groove 411, which are respectively used to accommodate the first spring plate 43 and the second spring plate 44. In this embodiment, the first spring plate 43 and the second spring plate 44 are wave springs. The first spring plate 43 abuts against the pressure retainer secondary piece 42 to provide elastic force so that the pressure retainer secondary piece 42 can be smoothly opened when subjected to the action of the fluid. The second spring piece 44 presses against the pressure-maintaining rod 45 in the second spring piece groove 413, and the pressure-maintaining rod 45 presses against the pressure retainer sub-piece 42, so that the pressure-maintaining rod 45 is pressed against the second spring piece 44 to push the pressure retainer sub-piece 42 toward the tooth portion of the inner gear ring 32, and when the pressure retainer sub-piece 42 is opened, a pressure guiding groove 50 is formed between the pressure retainer main piece 41 and the pressure retainer sub-piece 42.

[0040] The front and rear sides of the pressure retainer main piece 41 are provided with pressure retaining side pieces 46, and the front and rear sides of the pressure retainer main piece 41 are respectively provided with an embedding groove 414, and an overhead column 47 is arranged in the embedding groove 414, one end of the overhead column 47 is located in the embedding groove 414, and the other end passes through the pressure retaining side piece 46, the back support ring 48 and the back support ring oil seal 49 respectively and is inserted into the second shaft hole 26 of the front cover 21 and the rear cover 22. The embedding groove 414 is separated from the containing groove 411 by a retaining wall 415, and one end of the pressure retainer auxiliary piece 42 is against the retaining wall 415, and the retaining wall 415 provides support for the pressure retainer auxiliary piece 42.

[0041] like Figure 4 and Figure 6 When the drive shaft 34 drives the inner gear ring 32 to rotate together, the fluid (such as hydraulic oil) flowing from the oil inlet 212 to the oil inlet channel 214 will be entrained to contact with the pressure retainer assembly 40 as the inner gear ring 32 and the drive shaft 34 rotate synchronously, and the fluid will gradually be pressurized as the tooth gap space decreases, and then the high-pressure fluid will be squeezed out from the oil outlet 221 along the oil outlet channel 223. In the process of discharging the high-pressure fluid, a part of the high-pressure fluid will flow back into the pressure guide groove 50, and at this time, the pressure retainer main plate 41 and the pressure retainer auxiliary plate 42 will be opened at a certain angle until the high-pressure fluid is blocked by the pressure retaining rod 45 and then flows out of the pressure guide groove 50.

[0042] The present invention can configure different pressure retainer assemblies 40 according to actual needs. Figure 8 In the second embodiment of the present invention, the pressure retainer assembly 40 includes an overhead shaft 60, both ends of which are fixed in the second shaft holes 26 of the front cover 21 and the rear cover 22, and a recessed portion 61 is provided on the outer periphery of the overhead shaft 60, a crescent-shaped pressure retainer main piece 41 is partially accommodated in the recessed portion 61, the inner peripheral surface of the pressure retainer main piece 41 abuts against the recessed portion 61 of the overhead shaft 60, and a groove 411 is provided on the outer peripheral surface, and a pressure retainer sub-piece 42 is accommodated in the groove 411, one end of the pressure retainer sub-piece 42 abuts against the recessed portion 61 of the overhead shaft 60, and one end of the pressure retainer main piece 41 and the pressure retainer sub-piece 42 both abut against the recessed portion 61 of the overhead shaft 60 as support. A pressure guiding groove 50 is formed between the pressure retainer sub-piece 41 and the pressure retainer main piece 42. The pressure retainer main piece 41 is provided with a first spring sheet groove 412 and a second spring sheet groove 413 in the edge of the receiving groove 411, respectively used to accommodate the first spring sheet 43 and the second spring sheet 44. The first spring sheet 43 abuts against the pressure retainer sub-piece 42, and the second spring sheet 44 abuts against the pressure retaining rod 45 located in the second spring sheet groove 413. The pressure retaining rod 45 abuts against the pressure retainer sub-piece 42, so that the pressure retaining rod 45 is abutted by the second spring sheet 44 and pushes the pressure retainer sub-piece 42 away from the pressure retainer main piece 41, that is, the pressure retaining rod 45 pushes the pressure retainer sub-piece 42 toward the tooth portion of the inner gear ring 32. The actuation principle and the configuration of other components of the second embodiment are the same as those of the first embodiment, and will not be repeated.

[0043] like Fig. 9In the third embodiment of the present invention, the pump body 20 includes a front cover 21, a rear cover 22 and a body 23 disposed between the front cover 21 and the rear cover 22. The outer periphery of the body 23 is square, and a circular chamber 232 is coaxially arranged at the center of the body 23. The cross section of the chamber 232 is circular, and the chamber 232 is coaxially designed with the body 23. The four ends of the front cover 21 and the rear cover 22 are fixed together by four bolts 24, and the bolts 24 simultaneously pass through the ends of the body 23 around to fix the front cover 21, the body 23 and the rear cover 22 together. The other structures of this embodiment are the same or similar to those of the first embodiment, and will not be repeated. To sum up, in the concentric body high-pressure internal gear pump 10 of the present invention, the chamber 232 and the body 23 are coaxially designed, so that the body 23 has a uniform wall thickness. In this way, when the temperature gradually rises under the continuous operation of the oil pump and causes the thermal expansion deformation of the body 23, since the annular chamber 232 of the present invention is coaxially arranged with the body 23, the body 23 can be uniformly heated and deformed in a concentric direction during the heating and thermal deformation, so that the chamber 232 maintains a good roundness, and the inner gear ring 32 and the chamber 232 have a good coaxiality. Therefore, the body 23 can maintain coaxial operation during the rotation of the inner gear ring 32, and will not cause wear due to the different axes of the body 23 and the inner gear ring 32, causing damage to the oil pump, thereby improving the service life of the oil pump and the implicit flow and pressure output.

[0044] In addition, the oil inlet channel 214 and the oil outlet channel 223 are arranged in parallel with the drive shaft 34, and the inner gear ring 32 is not provided with radial through holes, so that when the hydraulic oil is sucked into the chamber 232 from the oil inlet port 212 through the oil inlet channel 214 or discharged from the chamber 232 to the oil outlet port 221 through the oil outlet channel 223, no turbulent flow obstruction is formed, and since the oil outlet port 221 is not in the radial direction of the drive shaft 34, it can flow out in large quantities and quickly from the side of the chamber 232, so that the flow smoothness of the hydraulic oil can be effectively improved. In addition, since the oil inlet port 212 and the oil outlet port 221 are located on the same side of the pump body 20, the concentric body servo energy-saving high-pressure internal gear pump 10 of the present invention can be conveniently installed with other components (such as pipelines).

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A concentric body servo energy-saving high-pressure internal gear pump, characterized in that: include: A pump body, the pump body comprising a front cover, a rear cover and a body disposed between the front cover and the rear cover, the front cover being provided with an oil inlet, the rear cover being provided with an oil outlet, an annular chamber being coaxially disposed at the center of the body, the chamber being in communication with the oil inlet and the oil outlet; a drive assembly, comprising an inner gear ring rotatably disposed in the chamber, and a drive shaft rotatably disposed in the inner gear ring, the inner gear ring and the chamber are coaxially disposed, the drive shaft has an outer tooth portion, the outer tooth portion is partially meshed with the inner gear ring, and the axis of the drive shaft is eccentrically disposed with respect to the body; a pressure retainer assembly disposed between the inner gear ring and the outer gear portion; The pressure retainer assembly comprises a crescent-shaped pressure retainer main piece and an arc-shaped pressure retainer auxiliary piece, the outer peripheral surface of the pressure retainer main piece is provided with a receiving groove, the pressure retainer auxiliary piece is arranged in the receiving groove, a pressure guiding groove is formed between the pressure retainer auxiliary piece and the pressure retainer main piece, the pressure retainer main piece is concavely provided with a first spring sheet groove and a second spring sheet groove in the edge of the receiving groove, respectively used to accommodate a first spring sheet and a second spring sheet, the first spring sheet abuts against the pressure retainer auxiliary piece, the second spring sheet abuts against a pressure-maintaining rod located in the second spring sheet groove, and the pressure-maintaining rod abuts against the pressure retainer auxiliary piece, so that the pressure-maintaining rod is abutted by the second spring sheet and pushes the pressure retainer auxiliary piece toward the tooth portion of the inner gear ring; The front and rear sides of the pressure retainer main sheet are provided with pressure retaining side sheets, and the front and rear sides of the pressure retainer main sheet are respectively provided with an embedding groove, and a top column is provided in the embedding groove, one end of the top column is located in the embedding groove, and the other end passes through the pressure retaining side sheet and is fixed to the front cover or the rear cover; A retaining wall is provided between the embedding groove and the containing groove, and one end of the pressure retainer sub-piece abuts against the retaining wall; The pressure retainer assembly includes an overhead shaft, both ends of which are fixed to the front cover and the rear cover, a recessed portion is provided on the outer periphery of the overhead shaft, a crescent-shaped pressure retainer positive sheet is partially accommodated in the recessed portion, and the inner peripheral surface of the pressure retainer positive sheet is against the overhead shaft.

2. The concentric body servo energy-saving high-pressure internal gear pump according to claim 1 is characterized in that: One end of the driving shaft is provided with a driving portion protruding out of the front cover.

3. The concentric body servo energy-saving high-pressure internal gear pump according to claim 1 is characterized in that: The front cover is provided with an oil inlet channel connected to the oil inlet port, and the rear cover is provided with an oil outlet channel connected to the oil outlet port. The oil inlet channel and the oil outlet channel are both parallel to the axis of the drive shaft, and the oil inlet channel, the oil outlet channel and the drive shaft are located on different axes.

4. The concentric body servo energy-saving high-pressure internal gear pump according to claim 3 is characterized in that: The oil inlet is perpendicular to the oil inlet passage, or / and the oil outlet is perpendicular to the oil outlet passage.

5. The concentric body servo energy-saving high-pressure internal gear pump according to claim 3 or 4, characterized in that: The oil inlet and the oil outlet are located on the same side of the pump body.

6. The concentric body servo energy-saving high-pressure internal gear pump according to claim 1 is characterized in that: The body is circular or square, and convex rings are convexly arranged on the surfaces of the front cover and the rear cover facing the body, and the two ends of the chamber are sleeved on the convex rings.

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