Four-quadrant working internal gear pump

Abstract

The utility model relates to a four-quadrant working internal gear pump, and relates to the technical field of hydraulic pumps. The gear pump cover comprises a pump cover shell, a medium exchange port and a one-way valve, and a medium passage is formed in the four-quadrant working internal gear pump cover; the medium exchange port is located in the top of the pump cover shell. When the four-quadrant working internal gear pump cover is connected with the pump body, the medium exchange port is used for exchanging media with the outside, and the one-way valve is used for conveying the media leaked in the medium channel to the low-pressure medium cavity. In the working process of the internal gear pump, under the condition that a pump cover is connected with a pump body, an axial compensation structure and a radial compensation structure between the pump body and the pump cover are designed, so that in the working process of the pump cover gear pump, when high-pressure oil passes through an oil pumping assembly, the oil can be effectively compensated when an axial gap and a radial gap are generated; clearance compensation is achieved through a mechanical structure, so that the oil drainage amount generated by clearances in the working process is reduced, the volume efficiency is improved, and the low-speed performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic pump technical field especially relates to a four quadrant operation internal meshing gear pump. BACKGROUND

[0002] Internal meshing gear pump has the characteristics of small noise, small flow pulsation, high efficiency, through the axial and radial gap compensation design, can further improve the efficiency, and can obtain good low speed performance, is currently widely used in servo hydraulic field.

[0003] In the related art, internal meshing gear pump usually through radial gap compensation design, reduce the leakage of radial gap, improve the volumetric efficiency, improve low speed performance.In addition, the gear pump needs to design an additional oil return port in addition to the design of oil inlet and outlet, so that the high pressure leakage medium in the pump cavity flows back to the oil tank through the oil return port.

[0004] However, the related art does not compensate for the axial gap while compensating for the radial gap. In addition, the related art requires the design of an oil return port, and the hydraulic system needs to add an oil pipe, which brings inconvenience to installation and use. SUMMARY

[0005] The utility model discloses four quadrant operation internal meshing gear pump, can realize the axial compensation and radial compensation of pump oil under the working state simultaneously, and increase the design of oil return oil circuit, through the leakage medium returns to the low pressure cavity through the inner pump inner channel, thereby reducing the design of the leakage medium through the third oil port to the oil tank, the device includes gear pump cover, pump body and pump oil component;

[0006] The gear pump cover is connected with the pump body, and a medium passage is formed in the pump body, which is used for passing medium when the four quadrant internal meshing gear pump cover works;

[0007] When the pump cover is connected with the pump body, a containing cavity is formed, the pump oil component is located in the containing cavity, and is located at the connection between the pump cover and the pump body, and the pump oil component is fixedly connected with the pump cover and the pump body respectively;

[0008] The gear pump cover comprises a pump cover shell, a medium exchange port and a one-way valve, and a medium passage is formed in the four quadrant operation internal meshing gear pump cover;

[0009] The medium exchange port is located at the top of the pump cover shell;

[0010] When the four quadrant operation internal meshing gear pump cover is connected with the pump body, the medium exchange port is used for exchanging medium with the outside world, and the one-way valve is used for selectively conveying the high pressure medium leaked in the medium passage to the low pressure medium cavity.

[0011] In an optional embodiment, the pump cover shell comprises at least two medium exchange ports;

[0012] The at least two media exchange ports include at least one media inlet and at least one media outlet;

[0013] The media inlet, the media outlet and the one-way valve are located in the same media passage;

[0014] The one-way valve is provided with a one-way valve mounting hole;

[0015] The one-way valve is located inside the one-way valve mounting hole;

[0016] The first end of the one-way valve is opposite to the media passage, and the second end of the one-way valve is provided with a plug;

[0017] The one-way valve mounting hole forms an outlet oil path for connecting to the media passage.

[0018] In an optional embodiment, the one-way valve is in interference fit with the media exchange port;

[0019] Or,

[0020] The one-way valve is in threaded connection with the media passage; the one-way valve is provided with a sealing ring;

[0021] The sealing ring is in contact with the one-way valve and the media passage;

[0022] The sealing ring is used to reinforce the connection of the one-way valve and the media passage.

[0023] In an optional embodiment, the pump oil component has an axial compensation structure and a radial compensation structure;

[0024] The axial compensation structure is used to realize axial gap compensation of the pump oil component when the four-quadrant working meshing gear pump works;

[0025] The radial compensation structure is used to realize radial gap compensation of the pump oil component when the four-quadrant working meshing gear pump works.

[0026] In an optional embodiment, the pump oil component includes an inner gear and an outer gear;

[0027] The outer gear is in meshing with the inner gear, and the radius of the outer gear is smaller than that of the inner gear;

[0028] A volume cavity is formed between the outer gear and the inner gear, and the volume cavity is used to pass media when the four-quadrant working meshing gear pump works;

[0029] The radial compensation structure and the axial compensation structure are located inside the volume cavity;

[0030] The radial compensation structure and the axial compensation structure are in contact.

[0031] In an alternative embodiment, the axial compensation structure comprises an axial plate, the radial compensation structure comprises an oil distribution disc and an oil distribution disc holder;

[0032] The axial plate is provided with at least one through hole;

[0033] The surface of the oil distribution disc holder is provided with at least one slot, the number and position of the through holes correspond to the number and position of the slots;

[0034] The surface of the oil distribution disc and the surface of the oil distribution disc holder with the slots are matched to form an oil channel;

[0035] When the four-quadrant working internal meshing gear pump is working, the medium passes through the through holes and the oil channel to separate the oil distribution disc and the oil distribution disc holder.

[0036] In an alternative embodiment, the axial plate is implemented as an axisymmetric structure;

[0037] The axial plate comprises a first through hole, a second through hole, a third through hole, a fourth through hole and a sunken groove;

[0038] The first through hole is located at the axis of the axisymmetric structure, and the first through hole is implemented as an axisymmetric shape for positioning and installation;

[0039] The number of the sunken groove, the second through hole and the third through hole is two, which are distributed in an axisymmetric manner;

[0040] The second through hole and the third through hole are located inside the sunken groove;

[0041] The sunken groove has a connecting part for passing the medium;

[0042] The second through hole and the third through hole are used to connect the oil inlet and outlet of the pump cover;

[0043] The fourth through hole is located at the axis of the axisymmetric structure, and the fourth through hole is used for positioning and installation and forms a medium passage when the four-quadrant working internal meshing gear pump cover is working.

[0044] In an alternative embodiment, the number and position of the oil distribution disc and the oil distribution disc holder correspond to the sunken groove;

[0045] The radial compensation structure further comprises a stop pin;

[0046] The stop pin is in contact with the oil distribution disc and the oil distribution disc holder to support the oil distribution disc and the oil distribution disc holder;

[0047] The stop pin is used to limit the relative displacement of the oil distribution disc and the oil distribution disc holder.

[0048] In an alternative embodiment, the radial compensation structure further comprises a sealing roller and a spring sheet;

[0049] The sealing roller and the spring sheet are used to contact the oil distribution disc;

[0050] The sealing roller and the spring sheet are used for reinforcing the connection of the oil distribution plate and the oil distribution plate frame.

[0051] In an optional embodiment, when the internal gear pump cover is connected with the pump body, the pump cover cavity and the pump body cavity are formed;

[0052] The pump cover cavity, the pump body cavity and the one-way valve are located in the same medium passage;

[0053] The one-way valve is used for maintaining the leakage medium of the pump cover cavity to flow in the medium passage.

[0054] In an optional embodiment, when the internal gear pump cover is connected with the pump body, the end of the pump body also forms a skeleton oil seal cavity;

[0055] The skeleton oil seal cavity is communicated with the pump body cavity, and the skeleton oil seal cavity is used for realizing cavity sealing to ensure that the skeleton oil seal sealing pressure is maintained at low pressure.

[0056] The technical effects contained in each embodiment of the utility model at least include:

[0057] (1) on the pump cover structure, the leakage medium is transported back to the low pressure oil chamber through the one-way valve, the design of the excess return port is reduced, the complexity of the hydraulic system is reduced, and the user is convenient to install and use

[0058] (1) in the process of working of the internal gear pump, under the condition that the pump cover is connected with the pump body, by designing the axial compensation structure and the radial compensation structure between the pump body and the pump cover, when the high pressure oil passes through the pump oil assembly in the working process of the pump cover gear pump, the gap compensation can be realized through the mechanical structure when the axial gap and the radial gap are generated, thereby reducing the oil leakage amount generated by the gap in the working process, so that the volumetric efficiency is improved, and the low speed performance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0059] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0060] Figure 1 A structure schematic view of a gear pump cover provided by one exemplary embodiment of the utility model is shown.

[0061] Figure 2 A cross-sectional schematic view of a four-quadrant working internal gear pump provided by one exemplary embodiment of the utility model is shown.

[0062] Figure 3 Fig. 2 shows a cross-sectional schematic view of another four-quadrant working internal meshing gear pump according to an example embodiment of the present application.

[0063] Figure 4 Fig. 3 shows a cross-sectional schematic view of a pump oil component according to an example embodiment of the present application.

[0064] Figure 5 Fig. 4 shows a structural schematic view of an axial compensation structure according to an example embodiment of the present application.

[0065] Figure 6 Fig. 5 shows a schematic view of a combination of an axial compensation structure and a radial compensation structure according to an example embodiment of the present application.

[0066] Figure 7 Fig. 6 shows a cavity structure schematic view according to an example embodiment of the present application.

[0067] Figure 8 Fig. 7 shows a cavity structure schematic view from another angle according to an example embodiment of the present application. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will make further detailed description to the embodiments of the present application in combination with the drawings.

[0069] The gear pump cover and the four-quadrant working internal meshing gear pump according to the embodiments of the present application are applied to automobile and industrial scenes.

[0070] It should be noted that the four-quadrant working internal meshing gear pump cover and the internal meshing gear pump according to the embodiments of the present application can be used as a hydraulic pump motor.

[0071] Figure 1 Fig. 1 shows a structural schematic view of a gear pump cover according to an example embodiment of the present application, Figure 2 and Figure 3 Fig. 2 shows a cross-sectional schematic view of another four-quadrant working internal meshing gear pump according to an example embodiment of the present application. Figures 1 to 3 The four-quadrant working internal meshing gear pump comprises a gear pump cover 1, a pump body 2 and a pump oil component 12 as shown in Figure 2 Fig. 1.

[0072] The gear pump cover 1 is connected with the pump body 2, and the pump body 2 is formed with a medium passage for passing medium when the four-quadrant working internal meshing gear pump cover works.

[0073] When the pump cover 1 is connected with the pump body 2, a containing cavity is formed, the pump oil part 12 is located in the containing cavity, and is located at the connection of the pump cover 1 and the pump body 2, and the pump oil part 12 is fixedly connected with the pump cover 1 and the pump body 2 respectively.

[0074] In the embodiment of the utility model, the pump body is used to refer to all components of the pump assembly except the four-quadrant working internal meshing gear pump cover in the actual application scene. In one example, the pump body indicates the four-quadrant working internal meshing gear pump cover; in another example, the pump body indicates all modules including the control module and the motor module in the pump module except the four-quadrant working internal meshing gear pump cover. The specific structure and form of the pump body are not limited in the utility model. In the utility model, the four-quadrant working internal meshing gear pump cover pumps the medium into the pump body to realize the subsequent energy conversion or energy transmission process.

[0075] The gear pump cover 1 comprises a pump cover shell 11, a medium exchange port 111, and a one-way valve 112, and a medium passage is formed inside the four-quadrant working internal meshing gear pump cover.

[0076] The medium exchange port 111 is located at the top of the pump cover shell 11.

[0077] When the four-quadrant working internal meshing gear pump cover is connected with the pump body, the medium exchange port 111 is used for exchanging medium with the outside world, and the one-way valve 112 is used for selectively conveying the leaked high-pressure medium in the medium passage to the low-pressure medium cavity.

[0078] It should be noted that the above description is combined with Figure 2 and Figure 3 In the embodiment of the application, the pump cover shell 11 comprises at least two medium exchange ports 111; the at least two medium exchange ports 111 comprise at least one medium inlet and at least one medium outlet; the medium inlet, the medium outlet, and the one-way valve 112 are located in the same medium passage; the one-way valve 112 is provided with a one-way valve mounting hole 113; the one-way valve is located inside the one-way valve mounting hole 113; the first end of the one-way valve 112 is opposite to the medium passage, and the second end of the one-way valve 112 is provided with a plug 114. The one-way valve mounting hole 113 forms an outlet oil way 115. The outlet oil way 115 is used for connecting into the medium passage.

[0079] It should be noted that, as shown in Figure 2 the number of the one-way valve mounting hole 112 is 2. The oil ways formed by the two one-way valve mounting holes 112 can be parallel to each other or can form an included angle. Optionally, the included angle can be formed as at least one of an acute angle and an obtuse angle. In a preferred case, in order to make the structure compact, the included angle is realized as an obtuse angle.

[0080] In this case, the one-way valve is in interference fit with the medium exchange port; or, the one-way valve is in threaded connection with the medium passage; the one-way valve is provided with a sealing ring; the sealing ring is in contact with the one-way valve and the medium passage; and the sealing ring is used to reinforce the connection between the one-way valve and the medium passage. In the case that the medium passage is formed inside the four-quadrant working internal meshing gear pump, the oil return oil passage where the one-way valve is located is relatively separated from the main oil passage. During the working process of the main oil passage, the pump oil component circulates the medium inside the pump body by forming a high-pressure area and a low-pressure area, and after leakage of high-pressure medium occurs, the one-way valve in the oil return oil passage controls the flow direction of the medium, so that the leaked high-pressure medium is selectively delivered to the low-pressure area.

[0081] In summary, the device provided in the embodiment of the utility model, through one-way valve, the leaked medium is delivered back to the low-pressure oil cavity, the design of the excess oil return port is reduced, the complexity of the hydraulic system is reduced, and the user is convenient to install and use.

[0082] In the embodiment of the utility model, the pump oil component has an axial compensation structure and a radial compensation structure;

[0083] The axial compensation structure is used to realize axial gap compensation of the pump oil component when the four-quadrant working internal meshing gear pump works; and the radial compensation structure is used to realize radial gap compensation of the pump oil component when the four-quadrant working internal meshing gear pump works.

[0084] Next, the specific implementation forms of the axial compensation structure and the radial compensation structure will be described in combination with Figures 4 to 6

[0085] In an optional embodiment, the pump oil component 12 comprises an inner gear 124 and an outer gear 123; the outer gear 123 is in meshing engagement with the inner gear 124, and the radius of the outer gear 123 is smaller than that of the inner gear 124; a volume cavity is formed between the outer gear 123 and the inner gear 124, and the volume cavity is used for passing the medium when the four-quadrant working internal meshing gear pump works; the radial compensation structure 122 and the axial compensation structure 121 are located inside the volume cavity; and the radial compensation structure 122 and the axial compensation structure 121 are in contact.

[0086] That is, in the embodiment of the utility model, the structure of the internal meshing gear pump is adapted, and the axial compensation structure and the radial compensation structure are located on the flow path of the medium after being pressurized.

[0087] ​In an alternative embodiment, the axial compensation structure 121 comprises an axial plate 1211, the radial compensation structure 122 comprises an oil distribution disc 1221 and an oil distribution disc holder 1222; the axial plate 1211 is provided with at least one oil groove 12116; the surface of the oil distribution disc holder 1222 comprises at least one slot 12221, the number and position of the oil grooves correspond to the number and position of the slots; the oil distribution disc 1221 and the surface of the oil distribution disc holder 1222 with the slots are attached to form an oil channel. When the four-quadrant working meshing gear pump is working, the medium passes through the oil groove and the passage formed by the oil channel.

[0088] In this case, the axial plate 1211 is implemented as an axisymmetric structure; the axial plate comprises a first through hole 12111, a second through hole 12112, a third through hole 12113, a fourth through hole 12114 and a sunken groove 12115; the first through hole 12111 is located at the axis of the axisymmetric structure, and the first through hole 12111 is implemented as an axisymmetric shape for positioning and installation. In actual application, the first through hole can be implemented as a circular through hole for cooperating with the shaft stop pin 1223; the number of the sunken groove 12115, the second through hole 12112 and the third through hole 12113 is two, which are distributed in an axisymmetric manner; the second through hole 12112 and the third through hole 12113 are located inside the sunken groove 12115; the sunken groove 12115 has a connecting portion for passing the medium; the second through hole 12112 and the third through hole 12113 are used to connect the oil inlet and outlet of the pump cover; the fourth through hole 12114 is located at the axis of the axisymmetric structure, and the fourth through hole 12114 is used for positioning and installation.

[0089] It should be noted that, in the embodiment of the present application, the width of the oil groove 12116 is sufficient, so that in the working state, the high-pressure oil can separate the oil distribution disc 1221 and the oil distribution disc holder 1222 when forming the medium passage. In this case, the gap between the oil groove 12116 and the oil distribution disc 1221 and the oil distribution disc holder 1222 is connected, and the oil distribution disc holder has the slot 12221 adapted to this function.

[0090] In an alternative embodiment, the number and position of the oil distribution disc 1221 and the oil distribution disc holder 1222 correspond to the sunken groove 12115, and the radial compensation structure 122 further comprises a stop pin 1223. The stop pin 1223 is in contact with the oil distribution disc 1221 and the oil distribution disc holder 1222 for supporting the oil distribution disc 1221 and the oil distribution disc holder 1222, and the stop pin 1223 is used to limit the circumferential displacement of the oil distribution disc 1221 and the oil distribution disc holder 1222 under the action of high-pressure medium.

[0091] Correspondingly, please refer to Figure 4In order to reduce the leakage between the oil distribution disc and the oil distribution disc holder, the radial compensation structure 122 further comprises a sealing roller 1224 and a spring sheet 1225; the sealing roller 1224 and the spring sheet 1225 are used to contact the oil distribution disc 1222; the sealing roller 1224 and the spring sheet 1225 are used for sealing and organizing the leakage of high-pressure medium between the oil distribution disc and the oil distribution disc holder.

[0092] According to the above structural description, in the case of the combination of the outer gear and the inner gear as the pump oil component, the crescent-shaped cavity in the middle of the gear is filled with the radial compensation structure, and the crescent-shaped cavity between the gears is divided into two volume cavities, which can be regarded as a first volume cavity and a second volume cavity. When the gear rotates clockwise, the first volume cavity is an oil suction cavity, the meshing area volume of the gear becomes larger, the hydraulic oil is sucked into the first volume cavity, and with the rotation of the gear, the gear tooth groove between the two gears transports the hydraulic oil from the first volume cavity to the second volume cavity, and the gear meshing area volume at the second volume cavity becomes smaller, which is a high-pressure cavity, and the high-pressure hydraulic oil is discharged. When the gear rotates counterclockwise, the second volume cavity is a low-pressure oil suction cavity, and the first volume cavity is a high-pressure cavity, and the gear tooth groove transports the hydraulic oil from the second volume cavity to the first volume cavity. In the process, the medium is high-pressure oil or low-pressure oil, which passes through the oil passage formed by the sinking groove and the various through holes.

[0093] In order to meet the four-quadrant working, the radial compensation structure is designed symmetrically. In the embodiment of the utility model, it is composed of two oil distribution disc holders, two oil distribution discs, two sealing rollers and wave spring sheets. In the working process of the internal meshing gear pump, the high-pressure oil on the high-pressure cavity side enters the gap between the oil distribution disc and the oil distribution disc holder, and presses the oil distribution disc and the oil distribution disc holder to the addendum circle of the two gears respectively, reduces the gap of the addendum circle, and reduces the leakage of the high-pressure cavity oil to the low-pressure cavity. The gap between the oil distribution disc and the oil distribution disc holder is sealed by the sealing roller, and the high-pressure hydraulic oil presses the sealing roller against the tangent surface of the oil distribution disc and the oil distribution disc holder, and organizes the leakage of the hydraulic oil to the low-pressure area. The wave spring sheet presses the sealing roller against the tangent surface of the oil distribution disc and the oil distribution disc holder without establishing pressure, so as to realize sealing. The stop pin provides support for the oil distribution disc and the oil distribution disc holder, offsets the hydraulic pressure of the oil distribution disc and the oil distribution disc holder, and prevents the axial displacement of the oil distribution disc and the oil distribution disc holder.

[0094] Meanwhile, in the axial direction, the internal meshing gear pump is designed with two axial gap compensation plates, and the axial plates are also designed symmetrically to meet the four-quadrant working. The axial plate is designed with oil grooves corresponding in number and position to the radial compensation structure, and the oil grooves are respectively communicated with the two volume cavities; and the oil grooves are designed for the volume cavities to communicate with the oil inlet and outlet on the pump cover.

[0095] The second through hole and the third through hole are further included on the axial plate, which are respectively communicated with the oil channel formed by the slot on the oil distribution disc holder, so that the high-pressure oil can quickly fill the gap between the oil distribution disc and the oil distribution disc holder, quickly separate the oil distribution disc and the oil distribution disc holder, and realize the function of gap compensation.

[0096] Figure 7 An oil circuit structure schematic diagram of an internal gear pump is shown in an exemplary embodiment of the utility model, Figure 8 An oil circuit structure schematic diagram of another angle is shown. Figure 8 As shown, the accommodating space in the internal gear pump is formed with a pump cover cavity 610 and a pump body cavity 620, and the pump cover cavity 610 and the pump body cavity 620 are communicated. In this case, the end of the pump body is also formed with a skeleton oil seal cavity 630; the skeleton oil seal cavity is communicated with the pump body cavity, and the skeleton oil seal cavity is used to realize cavity sealing to ensure that the skeleton oil seal sealing pressure is maintained at low pressure. The skeleton oil seal cavity is communicated with the pump body cavity, and the skeleton oil seal cavity is used to realize cavity sealing to ensure that the skeleton oil seal sealing pressure is maintained at low pressure. In the embodiment of the utility model, the oil circuit of the pump cover cavity and the oil circuit of the oil seal cavity in front of the pump body and the oil circuit of the single valve form a 90° included angle.

[0097] It should be noted that the utility model Figure 8 In the embodiment of the utility model, the medium of the pump cover cavity flows into the gear low-pressure cavity through the corresponding oil circuit of the one-way valve, and the high-pressure medium leaked in the pump oil assembly also flows into the pump body cavity for circulation.

[0098] In summary, the internal gear pump provided by each embodiment of the utility model has the following advantages. In the process of working of the internal gear pump, when the pump cover is connected with the pump body, the axial compensation structure and the radial compensation structure between the pump body and the pump cover are designed, so that in the working process of the pump cover gear pump, when the high-pressure oil passes through the pump oil assembly, the gap compensation can be realized through the mechanical structure when the axial gap and the radial gap are generated, thereby reducing the oil leakage amount generated by the gap in the working process, improving the volumetric efficiency, and improving the low-speed performance.

[0099] It should be noted that in the embodiment of the utility model, the internal gear pump is also provided with necessary components in the pump body, such as sliding bearings and gear shafts. The specific position and combination mode of the above components are not limited in the utility model.

[0100] The above is only an optional embodiment of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A four-quadrant operating internal gear pump characterized by, The four-quadrant working internal meshing gear pump comprises a gear pump cover, a pump body and a pump oil component; The gear pump cover is connected with the pump body, and a medium passage is formed in the pump body for passing medium when the four-quadrant working internal meshing gear pump cover works; When the pump cover is connected with the pump body, a containing cavity is formed, the pump oil component is located in the containing cavity, and is fixedly connected with the pump cover and the pump body; The gear pump cover comprises a pump cover shell, a medium exchange port and a one-way valve, and a medium passage is formed in the four-quadrant working internal meshing gear pump cover; The medium exchange port is located at the top of the pump cover shell; When the four-quadrant working internal meshing gear pump cover is connected with the pump body, the medium exchange port is used for exchanging medium with the outside, and the one-way valve is used for selectively conveying high-pressure medium leaked in the medium passage to a low-pressure medium cavity.

2. The internal gear pump of claim 1, wherein, The pump cover shell comprises at least two medium exchange ports; At least one medium inlet and at least one medium outlet are included in the at least two medium exchange ports; The medium inlet, the medium outlet and the one-way valve are located in the same medium passage; The one-way valve is provided with a one-way valve mounting hole; The one-way valve is located inside the one-way valve mounting hole; A first end of the one-way valve is opposite to the medium passage, and a second end of the one-way valve is provided with a plug; The one-way valve mounting hole forms an outlet oil passage for connecting into the medium passage.

3. The four-quadrant operating internal gear pump of claim 2, wherein, The one-way valve is interference-fitted with the medium exchange port; Or, The one-way valve is threadedly connected with the medium passage; the one-way valve is provided with a sealing ring; The sealing ring is in contact with the one-way valve and the medium passage; The sealing ring is used for reinforcing the connection of the one-way valve and the medium passage.

4. The four-quadrant operating internal gear pump of claim 1 wherein, The pump oil component has an axial compensation structure and a radial compensation structure; The axial compensation structure is used for realizing axial gap compensation of the pump oil component when the four-quadrant working internal meshing gear pump works; The radial compensation structure is used for realizing radial gap compensation of the pump oil component when the four-quadrant working internal meshing gear pump works.

5. The four-quadrant operating internal gear pump of claim 4 wherein, The pump oil component comprises an inner gear and an outer gear; The outer gear is engaged with the inner gear, and the radius of the outer gear is smaller than that of the inner gear; A volume cavity is formed between the outer gear and the inner gear, and is used for passing medium when the four-quadrant working internal meshing gear pump works; The radial compensation structure and the axial compensation structure are located inside the volume cavity; The radial compensation structure and the axial compensation structure are in contact.

6. The four-quadrant operating internal gear pump of claim 5, wherein, The axial compensation structure comprises an axial plate, and the radial compensation structure comprises an oil distribution disc and an oil distribution disc holder; At least one through hole is formed in the axial plate; At least one slot is formed on the surface of the oil distribution disc holder, and the number and positions of the through holes correspond to those of the slots; The oil distribution disc is attached to the surface of the oil distribution disc holder with the slots to form an oil channel. When the four-quadrant working internal meshing gear pump works, the medium passes through the passageway formed by the through hole and the oil channel to spread the oil distribution disc and the oil distribution disc holder.

7. The four-quadrant operating internal gear pump according to claim 6, characterized in that, The axial plate is implemented as an axisymmetric structure. The axial plate comprises a first through hole, a second through hole, a third through hole, a fourth through hole and a sunken groove. The first through hole is located at the axis of the axisymmetric structure and is implemented as an axisymmetric shape for positioning installation. The sunken groove, the second through hole and the third through hole are two in number and are distributed in an axisymmetric manner. The second through hole and the third through hole are located inside the sunken groove. The sunken groove has a connecting part for passing the medium. The second through hole and the third through hole are used to connect the inlet and outlet oil ports of the pump cover. The fourth through hole is located at the axis of the axisymmetric structure and is used for positioning installation and forms a medium passageway when the four-quadrant working internal meshing gear pump cover works.

8. The four-quadrant operating internal gear pump of claim 7, wherein, The number and position of the oil distribution disc and the oil distribution disc holder correspond to the sunken groove. The radial compensation structure further comprises a stop pin. The stop pin is in contact with the oil distribution disc and the oil distribution disc holder and is used to support the oil distribution disc and the oil distribution disc holder. The stop pin is used to limit the relative displacement of the oil distribution disc and the oil distribution disc holder.

9. The four-quadrant operating internal gear pump of claim 7 wherein, The radial compensation structure further comprises a sealing roller and a spring sheet. The sealing roller and the spring sheet are used to contact the oil distribution disc. The sealing roller and the spring sheet are used to reinforce the connection of the oil distribution disc and the oil distribution disc holder.

10. The internal gear pump of claim 1, wherein, When the internal meshing gear pump cover is connected with the pump body, a pump cover cavity and a pump body cavity are formed. The pump cover cavity, the pump body cavity and the one-way valve are located in the same medium passageway. The one-way valve is used to maintain the flow of leaked medium of the pump cover cavity in the medium passageway. When the internal meshing gear pump cover is connected with the pump body, the end part of the pump body further forms a skeleton oil seal cavity. The skeleton oil seal cavity is in communication with the pump body cavity and is used to realize cavity sealing to ensure that the skeleton oil seal sealing pressure is maintained at low pressure.

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