Gear pump cover and four-quadrant working internal gear pump

Abstract

The invention relates to a gear pump cover and 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 invention relates to the technical field of hydraulic pumps, and in particular to a gear pump cover and a four-quadrant working internal meshing gear pump. Background Art

[0002] Internal gear pumps have the characteristics of low noise, small flow pulsation and high efficiency. Through axial and radial clearance compensation design, the efficiency can be further improved and good low-speed performance can be obtained. They are currently widely used in the servo hydraulic field.

[0003] In the related art, the internal gear pump usually adopts radial clearance compensation design to reduce the leakage of radial clearance, improve volumetric efficiency and enhance low-speed performance. In addition, in addition to the design of the oil inlet and outlet, the gear pump also needs to design an additional oil return port so that the high-pressure leaked medium in the pump chamber can flow back to the oil tank through the oil return port.

[0004] However, the related art does not have a technology for compensating the axial clearance while compensating the radial clearance. In addition, the related art needs to design an oil return port, and the hydraulic system needs to add an oil pipe, which brings inconvenience to installation and use. Summary of the invention

[0005] The present invention relates to a gear pump cover and a four-quadrant working internal meshing gear pump, which can simultaneously realize axial compensation and radial compensation when pumping oil in a working state, and increase the design of an oil return oil circuit, so that the leaked medium returns to the low-pressure chamber through the inner flow channel of the inner pump, thereby reducing the design of returning the leaked medium to the oil tank through the third oil port. The technical solution is as follows: On the one hand, a gear pump cover is provided, the gear pump cover comprising a pump cover housing, a medium exchange port and a one-way valve, and a medium passage is formed inside the four-quadrant working internal meshing gear pump cover; The medium exchange port is located on the top of the pump cover housing; When the four-quadrant working internal gear pump cover is connected to the pump body, the medium exchange port is used to exchange the medium with the outside, and the one-way valve is used to selectively transport the high-pressure medium leaking in the medium passage to the low-pressure medium chamber.

[0006] In an optional embodiment, the pump cover housing includes at least two medium exchange ports; The at least two medium exchange ports include at least one medium inlet and at least one medium outlet; 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 installation hole; The first end of the one-way valve is opposite to the medium passage, and the second end of the one-way valve is provided with a plug; The one-way valve installation hole forms an outlet oil passage, and the outlet oil passage is used to be connected to the medium passage.

[0007] In an optional embodiment, the one-way valve is interference-fitted with the medium exchange port; or, The one-way valve is threadedly connected to the medium passage; the one-way valve is equipped with a sealing ring; The sealing ring is in contact with the one-way valve and the medium passage; The sealing ring is used to strengthen the connection between the one-way valve and the medium passage.

[0008] On the other hand, a four-quadrant working internal meshing gear pump is provided, the four-quadrant working internal meshing gear pump comprising any one of the above gear pump covers, a pump body and an oil pump component; The gear pump cover is connected to the pump body, and a medium passage is formed in the pump body. The medium passage is used to pass the medium when the four-quadrant internal meshing gear pump cover is working; When the pump cover is connected to the pump body, a receiving cavity is formed. The oil pump component is located in the receiving cavity and at the connection between the pump cover and the pump body. The oil pump component is fixedly connected to the pump cover and the pump body respectively. The oil pump component has an axial compensation structure and a radial compensation structure; The axial compensation structure is used to realize the axial clearance compensation of the pump oil parts when the four-quadrant internal gear pump is working; The radial compensation structure is used to realize radial clearance compensation of the pump oil components when the four-quadrant internal gear pump is working.

[0009] In an optional embodiment, the oil pump component includes an internal gear and an external gear; The outer gear meshes with the inner gear, and the radius of the outer gear is smaller than the radius of the inner gear; A volume cavity is formed between the external gear and the internal gear, and the volume cavity is used for passing the medium when the four-quadrant working internal gear pump is working; 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.

[0010] In an optional embodiment, the axial compensation structure includes an axial plate, and the radial compensation structure includes an oil distribution plate and an oil distribution plate frame; At least one through hole is formed on the axial plate; The surface of the oil distribution tray frame includes at least one slot, and the number of through holes corresponds to the number and position of the slots; The oil distribution plate and the oil distribution plate frame have grooved surfaces that fit together to form an oil passage; When the four-quadrant internal gear pump is working, the medium passes through the passage formed by the through hole and the oil channel to support the oil distribution plate and the oil distribution plate frame.

[0011] In an optional embodiment, the axial plate is implemented as an axisymmetric structure; The axial plate includes a first through hole, a second through hole, a third through hole, a fourth through hole and a sinking groove; The first through hole is located at the axis of the axisymmetric structure, and the first through hole is implemented in an axisymmetric shape for positioning and installation; The number of the sinking grooves, the second through holes and the third through holes is 2 and they are axially symmetrically distributed; The second through hole and the third through hole are located inside the sinking groove; The sinking tank has a connection part, and the connection part is used for passing the medium; The second through hole and the third through hole are used to connect the oil inlet and outlet of the pump cover; The fourth through hole is located at the axis of the axisymmetric structure. 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.

[0012] In an optional embodiment, the number and position of the oil distribution trays and the oil distribution tray racks correspond to the sinking tanks; The radial compensation structure also includes a stop pin; The stop pin contacts the oil distribution plate and the oil distribution plate frame, and is used to support the oil distribution plate and the oil distribution plate frame; The stop pin is used to limit the relative displacement of the oil distribution plate and the oil distribution plate frame.

[0013] In an optional embodiment, the radial compensation structure further includes a sealing roller and a spring sheet; The sealing roller and the spring sheet are used to contact the oil distribution plate; Sealing rollers and spring sheets are used to reinforce the connection between the oil distribution plate and the oil distribution plate frame.

[0014] In an optional embodiment, when the internal gear pump cover is connected to the pump body, a pump cover cavity and a pump body cavity are formed; The pump cover cavity, pump body cavity and one-way valve are located in the same medium passage; The one-way valve is used to keep the leaking medium in the pump cover cavity flowing in the medium passage.

[0015] In an optional embodiment, when the internal gear pump cover is connected to the pump body, the end of the pump body also forms a skeleton oil seal cavity; 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 sealing pressure of the skeleton oil seal is maintained at a low pressure.

[0016] The technical effects of various embodiments of the present invention include at least: (1) In the pump cover structure, the leaked medium is transported back to the low-pressure oil chamber through a one-way valve, which reduces the design of redundant oil return ports, reduces the complexity of the hydraulic system, and facilitates user installation and use (1) When the internal gear pump is working, with the pump cover connected to the pump body, by designing the axial compensation structure and radial compensation structure between the pump body and the pump cover, when the high-pressure oil passes through the pump oil assembly during the operation of the pump cover gear pump, when the axial clearance and radial clearance are generated, the clearance compensation can be achieved through the mechanical structure, thereby reducing the oil leakage caused by the clearance during the operation, thereby improving the volumetric efficiency and enhancing the low-speed performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a gear pump cover provided by an exemplary embodiment of the present invention is shown.

[0019] Figure 2 A cross-sectional schematic diagram of a four-quadrant internal gear pump provided by an exemplary embodiment of the present invention is shown.

[0020] Figure 3 A cross-sectional schematic diagram of another four-quadrant internal gear pump provided by an exemplary embodiment of the present invention is shown.

[0021] Figure 4 A cross-sectional schematic diagram of an oil pump component provided by an exemplary embodiment of the present invention is shown.

[0022] Figure 5 A schematic structural diagram of an axial compensation structure provided by an exemplary embodiment of the present invention is shown.

[0023] Figure 6 A schematic diagram of a combination of an axial compensation structure and a radial compensation structure provided by an exemplary embodiment of the present invention is shown.

[0024] Figure 7 A schematic diagram of a cavity structure provided by an exemplary embodiment of the present invention is shown.

[0025] Figure 8 A schematic diagram of a cavity structure at another angle provided by an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The gear pump cover and the four-quadrant working internal gear pump involved in the embodiments of the present invention are applied to automobile and industrial scenes. Optionally, the internal gear pump is used in industrial transmission scenes and can also be used for automobile active suspension, and the four-quadrant working internal gear pump cover is a detachable oil supply component in the internal gear pump.

[0028] It should be noted that the four-quadrant working internal gear pump cover and the internal gear pump involved in the embodiment of the present invention can be independently implemented as a hydraulic pump motor for use.

[0029] Figure 1 A schematic structural diagram of a gear pump cover provided by an exemplary embodiment of the present invention is shown.

[0030] Please refer to Figure 1 The gear pump cover 1 includes a pump cover housing 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; The medium exchange port 111 is located at the top of the pump cover housing 11; When the four-quadrant working internal gear pump cover is connected to the pump body, the medium exchange port 111 is used to exchange medium with the outside, and the one-way valve 112 is used to selectively transport the high-pressure medium leaking in the medium passage to the low-pressure medium chamber.

[0031] exist Figure 1 Shown is the basis of the gear pump cover, Figure 2 and Figure 3 The schematic diagram of the cross section of the four-quadrant internal gear pump under different cross sections is shown in Figure 1. Figures 1 to 3 The four-quadrant internal gear pump includes: Figure 2 The gear pump cover 1, pump body 2 and oil pump component 12 shown; The gear pump cover 1 is connected to the pump body 2, and a medium passage is formed in the pump body 2, and the medium passage is used to pass the medium when the four-quadrant inner meshing gear pump cover is working; When the pump cover 1 is connected to the pump body 2, an accommodating cavity is formed. The oil pump component 12 is located in the accommodating cavity and at the connection between the pump cover 1 and the pump body 2. The oil pump component 12 is fixedly connected to the pump cover 1 and the pump body 2 respectively.

[0032] In an embodiment of the present invention, the pump body is used to refer to the collection of all components of the pump assembly except the four-quadrant working internal gear pump cover in an actual application scenario. In one example, the pump body indicates the four-quadrant working internal gear pump cover; in another example, the pump body indicates all module contents in the pump module except the four-quadrant working internal gear pump cover, including the control module and the motor module. The present invention does not limit the specific structure and form of the pump body. In the present invention, the four-quadrant working internal gear pump cover pumps the medium into the pump body to realize the subsequent energy conversion or energy transfer process.

[0033] It should be noted that, combined with Figure 2 as well as Figure 3 In the embodiment of the present application, the pump cover housing 11 includes at least two medium exchange ports 111; the at least two medium exchange ports 111 include 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 passage 115. The outlet oil passage 115 is used to connect to the medium passage.

[0034] It should be noted that, in the embodiments of the present application, Figure 2 As shown, the number of the one-way valve mounting holes 112 is 2. The oil passages formed by the two one-way valve mounting holes 112 can be parallel to each other or form an angle. Optionally, the 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 angle is implemented as an obtuse angle.

[0035] In this case, the one-way valve and the medium exchange port are interference fit; or, the one-way valve is threadedly connected to the medium passage; the one-way valve is equipped with a sealing ring; the sealing ring is in contact with the one-way valve and the medium passage; the sealing ring is used to reinforce the connection between the one-way valve and the medium passage. When a medium passage is formed inside the four-quadrant internal gear pump, the return oil circuit where the one-way valve is located is relatively separated from the main oil circuit. During the operation of the main oil circuit, the pump oil component forms high-pressure and low-pressure areas so that the medium circulates inside the pump body. When the high-pressure medium leaks, it will enter the return oil circuit where the one-way valve is located. The one-way valve controls the flow direction of the medium in the return oil circuit, so that the leaked high-pressure medium is selectively transported to the low-pressure area.

[0036] In summary, the device provided in the embodiment of the present invention transports the leaked medium back to the low-pressure oil chamber through a one-way valve, thereby reducing the design of redundant oil return ports, reducing the complexity of the hydraulic system, and facilitating installation and use by users.

[0037] In the embodiment of the present invention, the oil pump component has an axial compensation structure and a radial compensation structure; The axial compensation structure is used to achieve axial clearance compensation of the oil pump component when the four-quadrant working internal gear pump is working; the radial compensation structure is used to achieve radial clearance compensation of the oil pump component when the four-quadrant working internal gear pump is working.

[0038] Next, combine Figures 4 to 6 , the specific implementation forms of the axial compensation structure and the radial compensation structure are explained, In an optional embodiment, the oil pump component 12 includes an internal gear 124 and an external gear 123; the external gear 123 is meshed with the internal gear 124, and the radius of the external gear 123 is smaller than the radius of the internal gear 124; a volume cavity is formed between the external gear 123 and the internal gear 124, and the volume cavity is used to pass the medium when the four-quadrant working internal gear pump is working; the radial compensation structure 122 and the axial compensation structure 121 are located inside the volume cavity; the radial compensation structure 122 and the axial compensation structure 121 are in contact.

[0039] That is, in the embodiment of the present invention, the structure adapted to the internal gear pump, the axial compensation structure and the radial compensation structure are both located on the flow path of the medium after pressurization.

[0040] In an optional embodiment, the axial compensation structure 121 includes an axial plate 1211, and the radial compensation structure 122 includes an oil distribution plate 1221 and an oil distribution plate frame 1222; at least one oil groove 12116 is provided on the axial plate 1211; the surface of the oil distribution plate frame 1222 includes at least one slot 12221, and the number of the oil grooves corresponds to the number and position of the slots; the slotted surfaces of the oil distribution plate 1221 and the oil distribution plate frame 1222 are fitted to form an oil passage. When the four-quadrant internal gear pump is working, the medium passes through the passage formed by the oil groove and the oil passage.

[0041] In this case, the axial plate 1211 is implemented as an axisymmetric structure; the axial plate includes a first through hole 12111, a second through hole 12112, a third through hole 12113, a fourth through hole 12114 and a sinking 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 applications, the first through hole can be realized as a circular through hole, which is used to cooperate with the shaft stop pin 1223; the number of the sinking groove 12115, the second through hole 12112 and the third through hole 12113 is 2, which are axially symmetrically distributed; the second through hole 12112 and the third through hole 12113 are located inside the sinking groove 12115; the sinking groove 12115 has a connecting portion, which is used to pass 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 axially symmetrical structure, and the fourth through hole 12114 is used for positioning and installation.

[0042] It should be noted that, in the embodiment of the present invention, the width of the oil groove 12116 is sufficient, so that when the medium passage is formed, in the working state, the high-pressure oil can open the oil distribution plate 1221 and the oil distribution plate frame 1222. In this case, the gap between the oil groove 12116 and the oil distribution plate 1221 and the oil distribution plate frame 1222 is connected, and the oil distribution plate frame has a slot 12221 adapted to this function.

[0043] In an optional embodiment, the number and position of the oil distribution plate 1221 and the oil distribution plate frame 1222 correspond to the sinking groove 12115, and the radial compensation structure 122 further includes a stop pin 1223. The stop pin 1223 contacts the oil distribution plate 1221 and the oil distribution plate frame 1222, and is used to support the oil distribution plate 1221 and the oil distribution plate frame 1222. The stop pin 1223 is used to limit the circumferential displacement of the oil distribution plate 1221 and the oil distribution plate frame 1222 under the action of the high-pressure medium.

[0044] For the corresponding Figure 4 In order to reduce the leakage between the oil distribution plate and the oil distribution plate frame, the radial compensation structure 122 also includes 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 plate 1222; the sealing roller 1224 and the spring sheet 1225 are used to seal and organize the leakage of high-pressure medium between the oil distribution plate and the oil distribution plate frame.

[0045] According to the above structural description, in the case of the combination of the outer gear and the inner gear as the oil pump component, the crescent-shaped chamber in the middle of the gear is filled with a radial compensation structure, which separates the crescent-shaped chamber between the gears into two volume chambers, which can be regarded as the first volume chamber and the second volume chamber. When the gear rotates clockwise, the first volume chamber is an oil suction chamber, the volume of the meshing area of ​​the gear becomes larger, and the hydraulic oil is sucked into the first volume chamber. As the gear rotates, the tooth groove between the two teeth of the gear transports the hydraulic oil from the first volume chamber to the second volume chamber, and the volume of the gear meshing area at the second volume chamber becomes smaller, which is a high-pressure chamber and discharges high-pressure hydraulic oil. When the gear rotates counterclockwise, the second volume chamber is a low-pressure oil suction chamber, and the first volume chamber is a high-pressure chamber. The gear tooth groove transports the hydraulic oil from the second volume chamber to the first volume chamber. In this process, the medium is high-pressure oil or low-pressure oil, which passes through the oil path formed by the sinking groove and each through hole.

[0046] In order to meet the four-quadrant operation, the radial compensation structure is designed symmetrically. In the embodiment of the present invention, it is composed of two oil distribution disc frames, two oil distribution discs, two sealing rollers and wave spring sheets. During the operation of the internal gear pump, the high-pressure oil on the high-pressure chamber side enters the gap between the oil distribution disc and the oil distribution disc frame, and presses the oil distribution disc and the oil distribution disc frame to the tooth top circles of the two gears respectively, reducing the gap between the tooth top circles and reducing the leakage of the high-pressure chamber oil to the low-pressure chamber. The gap between the oil distribution disc and the oil distribution disc frame 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 frame to prevent the hydraulic oil from leaking to the low-pressure area. When the pressure is not established, the wave spring sheet presses the sealing roller against the tangent surface of the oil distribution disc and the oil distribution disc frame to achieve sealing. The stop pin provides support to the oil distribution disc and the oil distribution disc frame, offsets the hydraulic pressure of the oil distribution disc and the oil distribution disc frame, and prevents the axial displacement of the oil distribution disc and the oil distribution disc frame.

[0047] At the same time, in the axial direction, the internal gear pump is designed with two axial clearance compensation plates. In order to meet the four-quadrant operation, the axial plates are also designed symmetrically. The axial plates are designed with oil grooves corresponding in number and position to the radial compensation structure, and the oil grooves are connected to the two volume chambers respectively; and oil grooves are designed for the volume chamber and the oil inlet and outlet on the pump cover.

[0048] The axial plate also includes a second through hole and a third through hole, which are respectively connected to the oil channels formed by the grooves on the oil distribution plate frame, so that the high-pressure oil can quickly fill the gap between the oil distribution plate and the oil distribution plate frame, quickly expand the oil distribution plate and the oil distribution plate frame, and realize the gap compensation.

[0049] Figure 7 FIG. 1 shows a schematic diagram of an oil circuit structure of an internal gear pump provided by an exemplary embodiment of the present invention. Figure 8 FIG. 2 shows a schematic diagram of the oil circuit structure from another angle. Figure 8As shown, the accommodation space in the internal gear pump forms a pump cover cavity 610 and a pump body cavity 620, and the pump cover cavity 610 is connected to the pump body cavity 620. In this case, a skeleton oil seal cavity 630 is also formed at the end of the pump body; the skeleton oil seal cavity is connected to the pump body cavity, and the skeleton oil seal cavity is used to achieve cavity sealing to ensure that the skeleton oil seal sealing pressure is maintained at a low pressure. Skeleton oil seal cavity; the skeleton oil seal cavity is connected to the pump body cavity, and the skeleton oil seal cavity is used to achieve cavity sealing to ensure that the skeleton oil seal sealing pressure is maintained at a low pressure. In an embodiment of the present invention, the pump cover cavity and the oil circuit in front of the pump body and the oil circuit of the oil seal cavity and the oil circuit of the one-way valve form a 90° angle.

[0050] It should be noted that please combine Figure 8 In the embodiment of the present invention, the medium in the pump cover cavity flows into the low-pressure cavity of the gear through the oil path corresponding to the one-way valve, and the high-pressure medium leaked from the pump oil assembly will also flow into the pump body cavity for circulation.

[0051] To summarize, the internal gear pump provided by each embodiment of the present invention, during the operation of the internal gear pump, when the pump cover is connected to the pump body, by designing the axial compensation structure and the radial compensation structure between the pump body and the pump cover, allows the pump cover gear pump to achieve clearance compensation through the mechanical structure when axial clearance and radial clearance are generated when the high-pressure oil passes through the oil pump assembly during operation, thereby reducing the oil leakage caused by the clearance during operation, thereby improving the volumetric efficiency and enhancing the low-speed performance.

[0052] It should be noted that, in the embodiment of the present invention, the internal gear pump is also equipped with necessary components inside the pump body, such as sliding bearings and gear shafts. The present invention does not limit the specific positions and combinations of the above components.

[0053] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gear pump cover, characterized in that: The gear pump cover comprises a pump cover shell, a medium exchange port and a one-way valve, and a medium passage is formed inside 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 gear pump cover is connected to the pump body, the medium exchange port is used to exchange medium with the outside, and the one-way valve is used to selectively transport the high-pressure medium leaking in the medium passage to the low-pressure medium chamber.

2. The gear pump cover according to claim 1, characterized in that: The pump cover housing includes at least two medium exchange ports; The at least two medium exchange ports include at least one medium inlet and at least one medium outlet; 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 installation hole; The first end of the one-way valve is opposite to the medium passage, and the second end of the one-way valve is provided with a plug; The one-way valve installation hole forms an outlet oil passage, and the outlet oil passage is used to be connected to the medium passage.

3. The gear pump cover according to claim 2, characterized in that: The one-way valve is interference-fitted with the medium exchange port; or, The one-way valve is threadedly connected to 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 to reinforce the connection between the one-way valve and the medium passage.

4. A four-quadrant internal gear pump, characterized in that: The four-quadrant working internal gear pump comprises the gear pump cover, pump body and oil pump component according to any one of claims 1 to 2; The gear pump cover is connected to the pump body, and a medium passage is formed in the pump body, and the medium passage is used to pass the medium when the four-quadrant inner meshing gear pump cover is working; When the pump cover is connected to the pump body, a receiving cavity is formed, and the oil pump component is located in the receiving cavity and at the connection between the pump cover and the pump body, and the oil pump component is fixedly connected to the pump cover and the pump body respectively; The oil pump component has an axial compensation structure and a radial compensation structure; The axial compensation structure is used to realize axial clearance compensation of the oil pump component when the four-quadrant internal gear pump is working; The radial compensation structure is used to achieve radial clearance compensation of the oil pump component when the four-quadrant internal gear pump is working.

5. The four-quadrant internal gear pump according to claim 4, characterized in that: The oil pump component includes an internal gear and an external gear; The external gear is meshed with the internal gear, and the radius of the external gear is smaller than the radius of the internal gear; A volume cavity is formed between the external gear and the internal gear, and the volume cavity is used for passing a medium when the four-quadrant working internal meshing gear pump is working; 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 internal gear pump according to claim 4, characterized in that: The axial compensation structure includes an axial plate, and the radial compensation structure includes an oil distribution plate and an oil distribution plate frame; The axial plate is provided with at least one through hole; The surface of the oil distribution tray includes at least one slot, and the number of the through holes corresponds to the number and position of the slot; The oil distribution plate and the oil distribution plate frame are fitted with the grooved surface to form an oil passage; When the four-quadrant internal gear pump is working, the medium passes through the passage formed by the through hole and the oil channel to open the oil distribution plate and the oil distribution plate frame.

7. The four-quadrant internal gear pump according to claim 6, characterized in that: The axial plate is realized as an axisymmetric structure; The axial plate includes a first through hole, a second through hole, a third through hole, a fourth through hole and a sinking groove; The first through hole is located at the axis of the axisymmetric structure, and the first through hole is implemented in an axisymmetric shape for positioning and installation; The number of the sinking groove, the second through hole and the third through hole is 2, and they are distributed in an axisymmetric manner; The second through hole and the third through hole are located inside the sinking groove; The sinking tank has a connecting portion, and the connecting portion is used for passing the medium; The second through hole and the third through hole are used to connect the oil inlet and outlet of the pump cover; 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.

8. The four-quadrant internal gear pump according to claim 7, characterized in that: The number and position of the oil distribution tray and the oil distribution tray rack correspond to the sinking tank; The radial compensation structure also includes a stop pin; The stop pin is in contact with the oil distribution plate and the oil distribution plate frame, and is used to support the oil distribution plate and the oil distribution plate frame; The stop pin is used to limit the relative displacement of the oil distribution plate and the oil distribution plate frame.

9. The four-quadrant internal gear pump according to claim 6, characterized in that: The radial compensation structure also includes a sealing roller and a spring sheet; The sealing roller and the spring sheet are used to contact the oil distribution plate; The sealing roller and the spring sheet are used to reinforce the connection between the oil distribution plate and the oil distribution plate frame.

10. The internal gear pump according to claim 4, characterized in that: When the internal gear pump cover is connected to 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 passage; The one-way valve is used to maintain the leakage medium of the pump cover cavity flowing in the medium passage; When the internal gear pump cover is connected to the pump body, the end of the pump body also forms a skeleton oil seal cavity; The skeleton oil seal cavity is communicated with the pump body cavity, and the skeleton oil seal cavity is used to achieve cavity sealing to ensure that the sealing pressure of the skeleton oil seal is maintained at a low pressure.

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