Bidirectional internal gear pump with backlash compensation function

Abstract

The utility model provides a bidirectional internal gear pump with backlash compensation function, which comprises a gear pump body, a gear pair, a radial backlash compensation assembly and an axial backlash compensation assembly, the gear pair comprises an internal gear and an external gear, the radial backlash compensation assembly comprises a main crescent plate and two auxiliary crescent plates, the outer arc section of the main crescent-shaped plate is convexly provided with a protrusion, the inner arc section of each auxiliary crescent-shaped plate is concavely provided with a groove, the protrusion is connected into the groove, and the axial clearance compensation assembly comprises two floating side plates which are oppositely arranged on the two sides of the gear pair in the axial direction. In this way, when oil enters, stress high-pressure areas of the main crescent plate and the auxiliary crescent plate are opened to be tightly attached to tooth crests of the inner gear and tooth crests of the outer gear respectively, the low-pressure side of the auxiliary crescent plate gets close and is tightly attached to the protrusion of the main crescent plate for extrusion, and therefore the radial clearance compensation effect is achieved, and the floating side plate is tightly attached to the end face of the gear pair under back pressure to form axial clearance compensation so as to reduce the axial clearance. Therefore, the bidirectional clearance compensation effect is achieved, and the service life of the gear pump is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of internal gear pump, especially a bidirectional internal gear pump with gap compensation function. BACKGROUND

[0002] The internal gear pump has compact structure, small volume, and the structure of the inner contact of the gear and the gear ring, which makes the contact point longer, so that it has better sealing effect, greater oil suction and discharge pressure angle, and further has lower noise, smaller flow pulsation and better oil suction capacity.

[0003] However, due to the accumulation of use time, the gear pair is prone to wear, so it is necessary to take measures to compensate the gap to ensure the equipment effect. The radial gap compensation assembly of the internal gear pump in the prior art usually needs to use a crescent plate in cooperation with other components, which has a complex structure and sometimes causes the gear pump to fail due to jamming, thereby affecting the equipment effect. Therefore, the post-maintenance is frequent, which increases the economic cost.

[0004] Therefore, it is necessary to provide a bidirectional internal gear pump with gap compensation function to solve or at least alleviate the above-mentioned defects. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the utility model is to provide a bidirectional internal gear pump with gap compensation function to solve the problem of complex structure of the radial gap compensation assembly in the prior art, which is prone to jamming and causes the gear pump to fail.

[0006] To achieve the above-mentioned purpose, the utility model provides a bidirectional internal gear pump with gap compensation function, which comprises a gear pump body, a gear pair, a radial gap compensation assembly and an axial gap compensation assembly arranged in the gear pump body, the gear pair comprises an inner gear and an outer gear, and the inner gear and the outer gear are eccentrically engaged; wherein,

[0007] The radial gap compensation assembly comprises a main crescent plate and two auxiliary crescent plates, the inner arc segment of the main crescent plate is arranged in abutment with the outer ring teeth of the inner gear, the two auxiliary crescent plates are arranged on one side of the outer arc segment of the main crescent plate in opposite directions along the central axis of the main crescent plate, and the outer arc segment of the auxiliary crescent plate is arranged in abutment with the inner ring teeth of the outer gear;

[0008] The outer arc segment of the main crescent plate is provided with a synapse, the inner arc segment of each auxiliary crescent plate is recessed to form a groove matched with the synapse, the synapse is connected in the groove, and the outer arc segment of the main crescent plate is recessed inward to form an oil guide chamber with the inner arc segment of the auxiliary crescent plate;

[0009] The axial gap compensation assembly comprises two floating side plates arranged in axial opposition, the two floating side plates are connected to two sides of the gear pair, and each of the floating side plates is provided with a side plate shaft hole for the motor shaft to pass through and an oil passage hole for oil to pass in and out.

[0010] Preferably, the number of the synapses is two, the two synapses are oppositely convex on the outer arc segment of the main crescent plate along the central axis of the main crescent plate, the inner arc segment of each of the secondary crescent plates is provided with a groove, and the two synapses are connected in the grooves of the two secondary crescent plates respectively.

[0011] Preferably, the gear pump body comprises a pump body and a pump cover, the gear pair, the radial gap compensation assembly and the axial gap compensation assembly are arranged in the pump body, the pump cover is connected to the top of the pump body, the pump cover is provided with an oil inlet and an oil outlet, and the bottom of the pump body is provided with a pump body shaft hole coaxially arranged with the side plate shaft hole.

[0012] Preferably, ear-shaped sealing rings are further arranged at the oil passage holes, the upper ear-shaped sealing ring is connected between the pump cover and the upper floating side plate, and the lower ear-shaped sealing ring is connected between the bottom end of the pump body and the lower floating side plate.

[0013] Preferably, two stop pins are further arranged, the middle part of the main crescent plate is recessed inward along the axial direction to form a stop groove, each of the floating side plates is provided with a mounting hole for the stop pin to pass through, and the stop pin passes through the mounting hole and extends into the stop groove.

[0014] Preferably, the synapses are in arc shape, and the grooves are in arc shape.

[0015] Preferably, dovetail grooves are further arranged on the floating side plates and are oppositely arranged relative to the oil guide chamber.

[0016] Preferably, lubricating shaft sleeves are further arranged at the side plate shaft hole of the upper floating side plate and between the side plate shaft hole of the lower floating side plate and the pump body shaft hole.

[0017] Preferably, the arc width of the groove is greater than the arc width of the synapse.

[0018] Preferably, a bushing is further arranged on the outer side of the outer gear.

[0019] Compared with the prior art, the gear pump provided by the utility model has the following beneficial effects:

[0020] The utility model provides a kind of bidirectional internal meshing gear pump with gap compensation function, including gear pump body, gear pair, radial gap compensation component and axial gap compensation component, gear pair includes internal gear and external gear, and it is arranged eccentrically and is engaged between internal gear and external gear, radial gap compensation component includes main crescent plate and two vice crescent plates, the inner arc segment of main crescent plate is arranged with the outer ring tooth of internal gear, two vice crescent plates are oppositely arranged in the outer arc segment side of main crescent plate along the central axis of main crescent plate, and the outer arc segment of vice crescent plate is arranged with the inner ring tooth of external gear, the outer arc segment of main crescent plate is formed with synapse by protruding, the recess of being matched with synapse is formed in the inner arc segment of each vice crescent plate by recessing, synapse is connected in recess, and the outer arc segment of main crescent plate is arranged inwardly recessed to form oil guide chamber with the inner arc segment of vice crescent plate, axial gap compensation component includes two floating side plates oppositely arranged along the axis, two floating side plates are connected to the two sides of gear pair, and side plate shaft hole for motor shaft to penetrate and oil hole for oil to enter and exit are formed in each floating side plate. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structures shown in these drawings without creative labor.

[0022] Figure 1 It is the assembly explosion schematic view in the pump body inside in an embodiment of the utility model;

[0023] Figure 2 It is the assembly schematic view of radial gap compensation component in an embodiment of the utility model;

[0024] Figure 3 It is the plane schematic view of radial gap compensation component in an embodiment of the utility model;

[0025] Figure 4 It is the assembly schematic view of floating side plate and ear type sealing ring in an embodiment of the utility model;

[0026] Figure 5 is a three-dimensional view of the embodiment of the present application after the pump cover is removed;

[0027] Figure 6 is a three-dimensional view of the overall structure of the embodiment of the present application;

[0028] Figure 7 is a cross-sectional view of the overall structure of the embodiment of the present application;

[0029] Figure 8 is a three-dimensional view of the overall structure of the embodiment of the present application from another perspective.

[0030] Figure 9 is an assembly view of the stop pin of the embodiment of the present application.

[0031] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0032] Explanation of reference numerals:

[0033] 10, radial gap compensation assembly; 110, main crescent plate; 111, synapse; 112, oil guide chamber; 113, stop groove; 120, auxiliary crescent plate; 121, groove; 20, axial gap compensation assembly; 210, floating side plate; 211, side plate shaft hole; 212, oil passage hole; 213, mounting hole; 214, dovetail groove; 220, ear-shaped sealing ring; 30, gear pair; 310, inner gear; 320, outer gear; 40, gear pump body; 410, pump body; 411, pump body shaft hole; 420, pump cover; 421, oil inlet; 422, oil outlet; 430, stop pin; 440, lubricating shaft sleeve; 450, bushing. DETAILED DESCRIPTION

[0034] It should be understood that the specific embodiments described herein are merely intended to explain the present application, and are not intended to limit the present application.

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0038] Please refer to the accompanying drawings Figures 1-9 The present application provides an embodiment of a bidirectional internal meshing gear pump with gap compensation function, comprising a gear pump body 40 and a gear pair 30, a radial gap compensation assembly 10 and an axial gap compensation assembly 20 arranged in the gear pump body 40. The gear pair 30 comprises an inner gear 310 and an outer gear 320, and the inner gear 310 and the outer gear 320 are eccentrically meshed. First of all, it should be noted that the axial direction in the present application refers to the gear axial direction (the extension direction of the motor shaft). Unlike the radial gap compensation assembly 10 of the internal meshing gear pump in the prior art, which usually needs to use a crescent plate with other components, its structure is complex, sometimes it will be stuck and cause the gear pump to fail, thereby affecting the equipment effect, so that the later maintenance is frequent, and the economic cost is increased. The present application solves the above-mentioned defects in the prior art by providing a bidirectional internal meshing gear pump with gap compensation function, as follows:

[0039] The radial gap compensation assembly 10 comprises a main crescent plate 110 and two auxiliary crescent plates 120, the inner arc segment of the main crescent plate 110 is arranged in abutment with the outer ring teeth of the inner gear 310, the two auxiliary crescent plates 120 are arranged in opposition along the central axis of the main crescent plate 110 on one side of the outer arc segment of the main crescent plate 110, and the outer arc segment of the auxiliary crescent plate 120 is arranged in abutment with the inner ring teeth of the outer gear 320; the outer arc segment of the main crescent plate 110 is convexly formed with a synapse 111, the inner arc segment of each auxiliary crescent plate 120 is concavely formed with a groove 121 arranged in matching with the synapse 111, the synapse 111 is connected in the groove 121, and the outer arc segment of the main crescent plate 110 is concavely arranged inward to form an oil guide chamber 112 between the inner arc segment of the auxiliary crescent plate 120; the axial gap compensation assembly 20 comprises two floating side plates 210 arranged in opposition along the axis, the two floating side plates 210 are connected on both sides of the gear pair 30, and each floating side plate 210 is provided with a side plate shaft hole 211 for the motor shaft to penetrate and an oil passage hole 212 for oil to enter and exit.

[0040] Specifically, the bidirectional internal meshing gear pump with gap compensation function in the application comprises a gear pump body 40, a gear pair 30, a radial gap compensation assembly 10 and an axial gap compensation assembly 20, the gear pump body 40 is used for mounting the remaining parts and serves as the whole bearing body, in a preferred embodiment, it can specifically comprise a pump body 410 and a pump cover 420, the pump body 410 is used for mounting the gear pair 30, the radial gap compensation assembly 10 and the axial gap compensation assembly 20 therein, and the pump cover 420 is connected to the pump body 410 to cover the pump body 410 to form a sealed device, it can be understood that the pump cover 420 has an oil inlet 421 and an oil outlet 422 to respectively communicate with the oil inlet cavity and the oil outlet cavity in the pump body 410, and the pump body 410 is provided with a pump body shaft hole 411 at the bottom to penetrate the motor shaft, so that the gear pair 30 is driven to rotate by the rotation of the motor shaft; the gear pair 30 comprises an outer gear 320 and an inner gear 310, the outer gear 320 and the inner gear 310 are arranged in eccentric internal meshing to form a bias gap, the bias gap is used for mounting the radial gap compensation assembly 10, so that the radial gap compensation assembly 10 is tightly pressed to compensate for the radial wear gap between the outer gear 320 and the inner gear 310; the axial gap compensation assembly 20 is used to compensate for the gap difference of the gear pump along the axis, so as to have the effect of bidirectional compensation, thereby greatly prolonging the service life of the equipment.

[0041] The radial gap compensation assembly 10 comprises a main crescent plate 110 and two auxiliary crescent plates 120. The inner arc segment of the main crescent plate 110 is arranged in abutment with the outer ring teeth of the ring gear 310, and the outer arc segment of the auxiliary crescent plate 120 is arranged in abutment with the inner ring teeth of the outer gear 320, so that the main crescent plate 110 and the auxiliary crescent plate 120 are arranged between the ring gear 310 and the outer gear 320, and two auxiliary crescent plates 120 are arranged to compensate for the radial gap from both ends of the main crescent plate 110, so as to ensure that the stress and compensation effect are uniform, and therefore the two auxiliary crescent plates 120 are arranged opposite to each other along the central axis of the main crescent plate 110. Preferably, the traditional compensation form using a sealing strip and an elastic element is abandoned, and the application is provided with a synapse 111 protruding from the outer arc segment of the main crescent plate 110, and a groove 121 recessed from the inner arc segment of the auxiliary crescent plate 120 and matched with the synapse 111, so that the synapse 111 is connected in the groove 121. When the oil enters, the main and auxiliary crescent plates 120 are opened in the high-pressure area and tightly adhere to the tooth top of the ring gear 320, and the auxiliary crescent plates 120 are close to each other in the low-pressure area and tightly adhere to the synapse 111 of the main crescent plate 110 for extrusion, thereby achieving the effect of radial gap compensation. Since the gear is circumferentially movable when it is engaged, the synapse 111 is also arranged in an arc shape in a preferred embodiment, which can facilitate the matching of the stress mode of the movement mode, so that the stress is more uniform when the radial gap is compensated, and the compensation effect is better. In order to facilitate the installation of the arc-shaped synapse 111, the groove 121 is also arranged in an arc shape.

[0042] Further, the outer arc segment of the main crescent plate 110 is recessed inwardly to form an oil guide chamber 112 with the inner arc segment of the auxiliary crescent plate 120, which is used to facilitate the entry of oil to quickly open the high-pressure area of the main and auxiliary crescent plates 120, close the low-pressure side of the auxiliary crescent plates 120, and tightly adhere to the synapse 111, thereby improving the efficiency of radial gap compensation. The axial gap compensation assembly 20 comprises two floating side plates 210 arranged opposite to each other along the axial direction, so as to compensate for the axial gap from the upper and lower sides of the axial direction, and the floating side plates 210 are pressed to respectively adhere to the upper and lower end faces of the gear pair 30, thereby achieving the effect of axial gap compensation. It can be understood that, in order not to affect the entry and exit of oil and the penetration connection of the motor shaft, the floating side plate 210 needs to be provided with a side plate shaft hole 211 for the penetration of the motor shaft and an oil passage hole 212 for the entry and exit of oil.

[0043] As a preferred embodiment of the utility model, the number of the synapses 111 is two, the two synapses 111 are oppositely arranged on the outer arc segment of the main crescent plate 110 along the central axis of the main crescent plate 110, and the inner arc segment of each of the auxiliary crescent plates 120 is provided with a recess 121 corresponding to the synapse 111.

[0044] It should be noted that, in order to ensure uniform radial gap compensation effect, the number of the synapses 111 on the main crescent plate 110 is two, so that each of the auxiliary crescent plates 120 corresponds to a synapse 111 for close contact, and therefore the inner arc segment of each of the auxiliary crescent plates 120 is provided with a recess 121 corresponding to the synapse 111.

[0045] As a preferred embodiment of the utility model, the ear-shaped sealing ring 220 is arranged at the oil hole 212, and the upper ear-shaped sealing ring 220 is connected between the pump cover 420 and the upper floating side plate 210, and the lower ear-shaped sealing ring 220 is connected between the bottom end of the pump body 410 and the lower floating side plate 210.

[0046] It should be noted that the ear-shaped sealing ring 220 is used for preventing oil leakage, so that the oil can only enter and exit from the oil hole 212, and cannot leak to other positions of the floating side plate 210, and therefore the ear-shaped sealing ring 220 is arranged at the oil hole 212, the upper ear-shaped sealing ring 220 is fixed between the upper floating side plate 210 and the pump cover 420, and the lower ear-shaped sealing ring 220 is fixed between the lower floating side plate 210 and the bottom end of the pump body 410; it is worth noting that, under the action of the pump cover 420 and the bottom of the pump body 410, a pre-compression force is applied to the ear-shaped sealing ring 220, and the pre-compression force drives the floating side plate 210 to tightly contact the upper and lower end surfaces of the gear pair 30, so as to further ensure the effect of axial gap compensation.

[0047] As a preferred embodiment of the utility model, the main crescent plate 110 is provided with a stop groove 113 formed by inwardly recessing the central part of the main crescent plate 110 along the axial direction, each of the floating side plates 210 is provided with a mounting hole 213 for penetrating the stop pin 430, and the stop pin 430 penetrates the mounting hole 213 and extends into the stop groove 113.

[0048] It is worth noting that the stop pin 430 is used to fix the main crescent plate 110 to avoid the main crescent plate 110 from deviating and rotating, so that the stop groove 113 is formed in the middle of the main crescent plate 110 and recessed inward on both sides in the axial direction to be connected with the stop pin 430, and considering that there are floating side plates 210 on both sides of the end face, the mounting hole 213 for the stop pin 430 to penetrate through is also needed to be formed on the floating side plate 210, so that the two stop pins 430 penetrate through the mounting holes 213 above and below from top to bottom and extend into the corresponding stop grooves 113, and the protruding position is just set between the two secondary crescent plates 120, please combine with the specific description of the drawings Figure 1 and the drawings Figure 9 .

[0049] Further, the dovetail groove 214 is also formed on the floating side plate 210, and the dovetail groove 214 is opposite to the oil guide chamber 112.

[0050] It should be understood that the dovetail groove 214 can facilitate part of the high-pressure oil to quickly enter the oil guide chamber 112 between the main crescent plate 110 and the secondary crescent plate 120 to realize the radial gap compensation function, so as to improve the efficiency of the radial gap compensation.

[0051] Further, the lubricating shaft sleeve 440 is connected between the side plate shaft hole 211 of the floating side plate 210 on the upper side and the side plate shaft hole 211 of the floating side plate 210 on the lower side and the pump body shaft hole 411.

[0052] It should be noted that the lubricating shaft sleeve 440 is used to reduce wear and tear to improve the service life, the lubricating shaft sleeve 440 at the side plate shaft hole 211 of the floating side plate 210 on the upper side is used to protect the motor shaft part between the floating side plate 210 on the upper side and the pump cover 420, and the lubricating shaft sleeve 440 between the side plate shaft hole 211 of the floating side plate 210 on the lower side and the pump body shaft hole 411 is used to protect the motor shaft part between the floating side plate 210 on the lower side and the bottom of the pump body 410.

[0053] Further, the arc width of the recess 121 is greater than the arc width of the synaptic knob 111.

[0054] It should be noted that in this way, the synaptic knob 111 and the recess 121 are used to have a certain activity space according to the situation when being extruded and pressed closely, which improves the adaptability of the device, avoids damage to parts due to excessive extrusion, and prolongs the service life of the device.

[0055] Further, the bushing 450 is sleeved on the outer side of the outer gear 320.

[0056] It can be understood that the bushing 450 is used for reducing the wear of the outer side of the outer gear 320, so as to prolong the service life of the parts, and thus is sleeved on the outer side of the outer gear 320.

[0057] For the convenience of those skilled in the art, the working process of the device is briefly described as follows:

[0058] When the motor shaft rotates, the inner gear 310 drives the outer gear 320 to rotate, forming a reciprocating and periodic volume cavity, so as to establish oil pressure; the pressure makes the oil enter the oil guide chamber 112 through the dovetail groove 214 on the floating side plate 210 and the gap between the main and secondary crescent plates 110 and 120; the main and secondary crescent plates 110 and 120 are opened under the force of the high-pressure area and tightly adhere to the tooth top of the inner and outer gears 310 and 320 respectively; the low-pressure side of the secondary crescent plate 120 is close to the synapse 111 of the main crescent plate 110 and tightly adheres to it, so as to play the effect of radial gap compensation; and the floating side plate 210 is tightly adhered to the end surface of the gear pair 30 under the back pressure, so as to form axial gap compensation.

[0059] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation according to the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, are all included in the patent protection range of the utility model.

Claims

1. A bidirectional internal gear pump having a gap compensation function, characterized by, The gear pump body and the gear pair, the radial gap compensation assembly and the axial gap compensation assembly arranged in the gear pump body, the gear pair includes an inner gear and an outer gear, and the inner gear and the outer gear are arranged in eccentric inner engagement; wherein, The radial gap compensation assembly includes a main crescent plate and two auxiliary crescent plates, the inner arc segment of the main crescent plate is arranged in abutment with the outer ring teeth of the inner gear, the two auxiliary crescent plates are arranged on one side of the outer arc segment of the main crescent plate in opposite directions along the central axis of the main crescent plate, and the outer arc segment of the auxiliary crescent plate is arranged in abutment with the inner ring teeth of the outer gear; The outer arc segment of the main crescent plate is convexly formed with a synapse, the inner arc segment of each auxiliary crescent plate is concavely formed with a groove matched with the synapse, the synapse is connected in the groove, and the outer arc segment of the main crescent plate is concavely arranged inward to form an oil guide chamber with the inner arc segment of the auxiliary crescent plate. The axial gap compensation assembly includes two floating side plates arranged in opposite directions along the axial direction, the two floating side plates are connected to the two sides of the gear pair, and each floating side plate is provided with a side plate shaft hole for the motor shaft to penetrate and an oil passage hole for oil to flow in and out.

2. The bidirectional internal gear pump with gap compensation function according to claim 1, characterized in that, The number of synapses is two, the two synapses are convexly arranged on the outer arc segment of the main crescent plate in opposite directions along the central axis of the main crescent plate, and each inner arc segment of the auxiliary crescent plate is provided with one groove.

3. The bidirectional internal gear pump with gap compensation function according to claim 1, characterized in that, The gear pump body includes a pump body and a pump cover, the gear pair, the radial gap compensation assembly and the axial gap compensation assembly are arranged in the pump body, the pump cover is connected to the top of the pump body, and the pump cover has an oil inlet and an oil outlet, and the bottom of the pump body is provided with a pump body shaft hole coaxially arranged with the side plate shaft hole.

4. The bidirectional internal gear pump with gap compensation function according to claim 3, characterized in that, It also includes ear-shaped sealing rings, the ear-shaped sealing rings are arranged at the oil passage hole in correspondence with the surrounding protection, and the ear-shaped sealing ring above is connected between the pump cover and the floating side plate above, and the ear-shaped sealing ring below is connected between the bottom end of the pump body and the floating side plate below.

5. The bidirectional internal gear pump with gap compensation function according to claim 3, characterized in that, It also includes two stop pins, the middle part of the main crescent plate is concavely formed with a stop groove along the axial direction on both sides, each floating side plate is provided with a mounting hole for the stop pin to penetrate, and the stop pin penetrates the mounting hole and extends into the stop groove.

6. The bidirectional internal gear pump with a gap compensation function according to claim 1, characterized by, The synapse is arc-shaped, and the groove is matched and arranged in an arc shape.

7. The bidirectional internal gear pump with a gap compensation function according to claim 1, characterized by, The floating side plate is also provided with a dovetail groove, and the dovetail groove is arranged opposite to the oil guide chamber.

8. The bidirectional internal gear pump with a gap compensation function according to claim 3, characterized by, It also includes a lubricating shaft sleeve, the lubricating shaft sleeve is connected at the side plate shaft hole of the floating side plate above and between the side plate shaft hole of the floating side plate below and the pump body shaft hole.

9. The bidirectional internal gear pump with a gap compensation function according to claim 1, characterized by, The arc width of the groove is greater than the arc width of the synapse.

10. The bidirectional internal gear pump with a gap compensation function according to claim 6, characterized by, It also includes a bushing, and the bushing is sleeved on the outside of the outer gear.

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