Internal gear pump and hydraulic system

Abstract

The utility model discloses an internal gear pump and a hydraulic system. The internal gear pump comprises a pump shell, an inner gear ring, a gear shaft and a crescent plate. The pump shell comprises a first wall surface and a second wall surface, the first wall surface is provided with a first oil inlet hole and a first oil outlet hole, and the second wall surface is provided with a second oil inlet hole and a second oil outlet hole; the inner gear ring is arranged in the pump shell; the gear shaft is rotatably arranged in the pump shell, the gear shaft is meshed with the inner gear ring, and a crescent cavity is formed between the gear shaft and the inner gear ring; the crescent plate is arranged in the crescent cavity, an oil suction cavity and an oil pressing cavity are formed in the two sides of the crescent plate in the circumferential direction respectively, the first oil inlet hole and the second oil inlet hole are communicated with the oil suction cavity respectively, and the first oil outlet hole and the second oil outlet hole are communicated with the oil pressing cavity respectively. The oil inlet hole and the oil outlet hole are respectively formed in different wall surfaces of the pump shell, so that the installation scene of the internal gear pump can be increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear pumps, in particular to an internal meshing gear pump and a hydraulic system. BACKGROUND

[0002] The internal meshing gear pump generally comprises a pump body, an inner gear ring and a gear arranged in the pump body, the inner gear ring and the gear are in meshing on one side, and are separated by a crescent plate assembly on the other side. The crescent plate assembly separates the non-meshing space between the inner gear ring and the gear into two chambers, the chamber where the two gears are disengaged is an oil suction chamber, and the chamber where the two gears are about to engage is an oil pressing chamber. When the internal meshing gear pump works, the gear rotates at high speed and drives the inner gear ring to rotate. In the process of transmission between the inner gear ring and the gear, the closed space volume of the oil suction chamber where the two gears are disengaged increases, forming a negative pressure, and oil is sucked from the oil inlet of the pump body, and the closed space volume of the oil pressing chamber where the two gears are about to engage decreases, and oil is pressed out from the oil outlet of the pump body. However, the interface of the conventional internal meshing gear pump and the external pipeline is only one set, and the structure is usually arranged on one side of the pump. In some specific application occasions, it is not convenient to install and use, or even it cannot be used. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to provide an internal meshing gear pump and a hydraulic system, and aims to improve the situation that the application scene of the internal meshing gear pump in the related art is limited.

[0004] According to a first aspect of the present application, an internal meshing gear pump is provided, comprising:

[0005] A pump shell comprising a first wall surface and a second wall surface, the first wall surface is provided with a first oil inlet hole and a first oil outlet hole, and the second wall surface is provided with a second oil inlet hole and a second oil outlet hole;

[0006] An inner gear ring arranged in the pump shell;

[0007] A gear shaft rotatably arranged in the pump shell, the gear shaft is in meshing with the inner gear ring, and a crescent-shaped cavity is arranged between the gear shaft and the inner gear ring;

[0008] A crescent plate arranged in the crescent-shaped cavity, two sides of the crescent plate along the circumference are respectively provided with an oil suction chamber and an oil pressing chamber, the first oil inlet hole and the second oil inlet hole are respectively communicated with the oil suction chamber, and the first oil outlet hole and the second oil outlet hole are respectively communicated with the oil pressing chamber.

[0009] Optionally, a first communication hole is arranged inside the pump shell, the first communication hole is communicated with the oil suction chamber, and the first communication hole is also respectively communicated with the first oil inlet hole and the second oil inlet hole; and / or

[0010] The pump shell is internally provided with a second communication hole, the second communication hole is in communication with the oil pressing cavity, and the second communication hole is also in communication with the first oil outlet hole and the second oil outlet hole respectively.

[0011] Optionally, the inner tooth ring is provided with a first oil passing hole extending from the inner circumferential surface of the inner tooth ring to the outer circumferential surface of the inner tooth ring, the first oil passing hole is in communication with the oil suction cavity, and the first oil passing hole is also in communication with the first oil inlet hole and the second oil inlet hole respectively; and / or,

[0012] The inner tooth ring is provided with a second oil passing hole extending from the inner circumferential surface of the inner tooth ring to the outer circumferential surface of the inner tooth ring, the second oil passing hole is in communication with the oil pressing cavity, and the second oil passing hole is also in communication with the first oil outlet hole and the second oil outlet hole respectively.

[0013] Optionally, the pump shell comprises a first cover body, a pump body and a second cover body connected in sequence, the first cover body, the pump body and the second cover body enclose a receiving cavity, the inner tooth ring and the crescent plate are accommodated in the receiving cavity, and the gear shaft is at least partially arranged in the receiving cavity;

[0014] The first cover body is provided with the first oil inlet hole and the first oil outlet hole, and / or the pump body is provided with the second oil inlet hole and the second oil outlet hole.

[0015] Optionally, along the axial direction of the gear shaft, the first cover body, the pump body and the second cover body are arranged in sequence, and one side of the first cover body away from the pump body is provided with the first wall surface;

[0016] Along the circumferential direction of the gear shaft, one side of the pump body is provided with the second wall surface.

[0017] Optionally, the second cover body is provided with a shaft hole in communication with the receiving cavity, and one end of the gear shaft passes through the shaft hole and extends out of the pump shell.

[0018] Optionally, the diameter of the first oil inlet hole is greater than the diameter of the first oil outlet hole; and / or,

[0019] The diameter of the second oil inlet hole is greater than the diameter of the second oil outlet hole.

[0020] Optionally, the inner meshing gear pump comprises a first cover plate, the first cover plate is detachably mounted on the first wall surface, and the first cover plate is used for closing the first oil inlet hole and the first oil outlet hole; or,

[0021] The inner meshing gear pump comprises a second cover plate, the second cover plate is detachably mounted on the second wall surface, and the second cover plate is used for closing the second oil inlet hole and the second oil outlet hole.

[0022] Optionally, the pump housing is provided with a first detection oil hole, the first detection oil hole is communicated with the first oil inlet hole and / or the second oil inlet hole, and the first detection oil hole is used for installing a sensor; and / or

[0023] The pump housing is provided with a second detection oil hole, the second detection oil hole is communicated with the first oil outlet hole and / or the second oil outlet hole, and the second detection oil hole is used for installing a sensor.

[0024] According to a second aspect of the present application, a hydraulic system is provided, comprising the internal gear pump as described above.

[0025] The internal gear pump disclosed in the present application has the following beneficial effects: the first wall surface of the pump housing is provided with the first oil inlet hole and the first oil outlet hole, the second wall surface of the pump housing is provided with the second oil inlet hole and the second oil outlet hole, the first oil inlet hole and the second oil outlet hole are respectively communicated with the oil suction cavity, and the first oil outlet hole and the second oil outlet hole are respectively communicated with the oil press cavity. When it is inconvenient to install one group of oil inlet and outlet holes, another group of oil inlet holes can be used to communicate with the external pipeline, thereby increasing the installation scenarios of the internal gear pump. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the specific embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0027] Figure 1 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown;

[0028] Figure 2 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown;

[0029] Figure 3 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown; Figure 1 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown;

[0030] Figure 4 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown;

[0031] Figure 5 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown; Figure 1 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown;

[0032] Figure 6 An exploded view of the structure of an internal gear pump according to one embodiment of the present application is shown;

[0033] Reference signs:

[0034] 10, pump housing; 101, accommodating cavity; 11, first cover; 111, first wall surface; 112, first oil inlet hole; 113, first oil outlet hole; 114, first detection oil hole; 115, second detection oil hole; 12, pump body; 121, second wall surface; 122, second oil inlet hole; 123, second oil outlet hole; 124, first communication hole; 125, second communication hole; 13, second cover;

[0035] 20, inner gear ring; 201, first oil passing hole; 202, second oil passing hole;

[0036] 30, gear shaft;

[0037] 40, crescent plate;

[0038] 10a, oil suction cavity; 10b, oil pressing cavity. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way should be taken as any limitation of the present application and its applications or uses. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without any creative effort fall within the scope of the present application.

[0040] The technologies, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description under appropriate circumstances.

[0041] In the description of the present application, it should be noted that the orientation words such as “front, back, up, down, left, right”, “transverse, vertical, perpendicular, horizontal” and “top, bottom” and the like indicate the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words “inner, outer” refer to the inner and outer of the contour of each component itself.

[0042] In the description of the present application, it should be noted that the use of the words “first”, “second” and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0043] The technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0044] Please refer to Figures 1 to 6 , one embodiment of the present application provides an internal gear pump, which comprises a pump shell 10, an inner gear ring 20, a gear shaft 30 and a crescent plate 40. The pump shell 10 comprises a first wall surface 111 and a second wall surface 121. The first wall surface 111 is provided with a first oil inlet hole 112 and a first oil outlet hole 113, and the second wall surface 121 is provided with a second oil inlet hole 122 and a second oil outlet hole 123. The inner gear ring 20 is arranged in the pump shell 10, and the gear shaft 30 is rotatably arranged in the pump shell 10 and engaged with the inner gear ring 20. A crescent-shaped cavity is arranged between the gear shaft 30 and the inner gear ring 20, and the crescent plate 40 is arranged in the crescent-shaped cavity. The two sides of the crescent plate 40 along the circumference are respectively provided with an oil suction cavity 10a and an oil pressing cavity 10b, and the first oil inlet hole 112 and the second oil inlet hole 122 respectively communicate with the oil suction cavity 10a, and the first oil outlet hole 113 and the second oil outlet hole 123 respectively communicate with the oil pressing cavity 10b.

[0045] Please refer to Figure 5 , please refer to Figure 2 and Figure 3 , in some embodiments, a first communication hole 124 is arranged inside the pump shell 10, the first communication hole 124 communicates with the oil suction cavity 10a, and the first communication hole 124 also respectively communicates with the first oil inlet hole 112 and the second oil inlet hole 122.

[0046] A second communication hole 125 is arranged inside the pump shell 10, the second communication hole 125 communicates with the oil pressing cavity 10b, and the second communication hole 125 also respectively communicates with the first oil outlet hole 113 and the second oil outlet hole 123.

[0047] In some embodiments, the diameter of the first oil inlet hole 112 is larger than the diameter of the first oil outlet hole 113, and / or the diameter of the second oil inlet hole 122 is larger than the diameter of the second oil outlet hole 123. Such structure arrangement makes the diameter of the oil inlet hole larger, and the larger diameter of the oil inlet hole can ensure the stable oil suction pressure in the oil pressing cavity 10b, reduce the risk of air entering, and improve the situation that the working efficiency of the internal gear pump is reduced due to the air entering the oil suction cavity 10a.

[0048] As shown in Figure 6 , in some embodiments, the pump shell 10 is provided with a first detection oil hole 114, and the first detection oil hole 114 communicates with the first oil inlet hole 112 and / or the second oil inlet hole 122. The first detection oil hole 114 is used to install a sensor to real-time feedback the working state of the internal gear pump at the oil inlet hole. As such sensors, oil inlet hole pressure sensor, oil inlet hole temperature sensor and oil inlet hole contamination sensor can be listed.

[0049] The pump housing 10 is provided with a second detection oil hole 115, which is in communication with the first oil outlet hole 113 and / or the second oil outlet hole 123, and is used to install a sensor to feed back the working state of the oil outlet hole of the internal gear pump in real time. As such sensors, oil outlet hole pressure sensors, oil outlet hole temperature sensors, and oil outlet hole vibration sensors can be listed.

[0050] In some embodiments, the internal gear pump comprises a first cover plate. The first cover plate is detachably mounted on the first wall surface 111 and is used to close the first oil inlet hole 112 and the first oil outlet hole 113. In actual hydraulic systems, the external pipeline is laid before the internal gear pump is installed. When the access direction of the external pipeline is difficult to match the orientation of the first oil inlet hole 112 and the first oil outlet hole 113, the first oil inlet hole 112 and the first oil outlet hole 113 are closed by the first cover plate to avoid leakage from the first oil inlet hole 112 and the first oil outlet hole 113 while oil enters and exits the second oil inlet hole 122 and the second oil outlet hole 123.

[0051] Exemplarily, the first wall surface 111 is provided with at least two threaded holes distributed around the four sides of the first wall surface 111. The same number of fasteners as the threaded holes pass through the first cover plate and are correspondingly screwed and fixed in the at least two threaded holes, so that the first cover plate closes the first oil inlet hole 112 and the first oil outlet hole 113.

[0052] In some embodiments, the internal gear pump comprises a second cover plate. The second cover plate is detachably mounted on the second wall surface 121 and is used to close the second oil inlet hole 122 and the second oil outlet hole 123. Similarly, when the access direction of the external pipeline is difficult to match the orientation of the second oil inlet hole 122 and the second oil outlet hole 123, the second oil inlet hole 122 and the second oil outlet hole 123 are closed by the second cover plate to avoid leakage from the second oil inlet hole 122 and the second oil outlet hole 123 while oil enters and exits the first oil inlet hole 112 and the first oil outlet hole 113.

[0053] It should be noted that the connection mode between the second cover plate and the second wall surface 121 can be the same as the connection mode between the first cover plate and the first wall surface 111. For details, please refer to the description of the specific connection mode between the first cover plate and the first wall surface 111, which will not be repeated here.

[0054] For the pump housing 10, Figure 1 , Figure 2 , Figure 4 and Figure 6As shown, in some embodiments, the pump housing 10 comprises a first cover 11, a pump body 12 and a second cover 13 connected in sequence. The first cover 11, the pump body 12 and the second cover 13 enclose a receiving cavity 101. Exemplarily, along the axial direction of the gear shaft 30, the first cover 11, the pump body 12 and the second cover 13 are arranged in sequence, and the first cover 11, the pump body 12 and the second cover 13 can be connected by screw sealing to form a three-piece structure. The inner ring gear 20 and the crescent plate 40 are accommodated in the receiving cavity 101, and the gear shaft 30 is at least partially arranged in the receiving cavity 101.

[0055] The first cover 11 is provided with the first wall surface 111 on the side away from the pump body 12. Exemplarily, the first oil inlet hole 112 and the first oil outlet hole 113 are located on the side of the first wall surface 111 close to the bottom thereof, and the first oil inlet hole 112 and the first oil outlet hole 113 are arranged side by side and spaced apart.

[0056] The pump body 12 is provided with the second wall surface 121 on one side along the circumferential direction of the gear shaft 30. Exemplarily, the first wall surface 111 and the second wall surface 121 are adjacent. The second oil inlet hole 122 and the second oil outlet hole 123 are both located in the middle part of the second wall surface 121, and the second oil inlet hole 122 and the second oil outlet hole 123 are arranged side by side and spaced apart.

[0057] As shown in the drawings, Figure 5 In some embodiments, the first communication hole 124 and the second communication hole 125 are both arranged inside the pump body 12.

[0058] The first oil inlet hole 112 and the second oil inlet hole 122 are communicated to the oil suction cavity 10a through the same first communication hole 124. Exemplarily, the axial direction of the first oil inlet hole 112 and the axial direction of the second oil inlet hole 122 are perpendicular to each other, and the axial direction of the second oil inlet hole 122 coincides with the axial direction of the first communication hole 124.

[0059] The first oil outlet hole 113 and the second oil outlet hole 123 are communicated to the oil pressure cavity 10b through the same second communication hole 125. Exemplarily, the axial direction of the first oil outlet hole 113 and the axial direction of the second oil outlet hole 123 are perpendicular to each other, and the axial direction of the second oil outlet hole 123 coincides with the axial direction of the second communication hole 125.

[0060] As shown in the drawings, Figure 6 In some embodiments, the first detection oil hole 114 and the second detection oil hole 115 are both arranged on the first cover 11. Exemplarily, the first detection oil hole 114, the second detection hole, the first oil outlet hole 113 and / or the first oil inlet hole 112 are located on the same side and arranged adjacent to each other.

[0061] The second cover 13 is provided with a shaft hole communicated with the receiving cavity 101, and one end of the gear shaft 30 passes through the shaft hole and extends out of the pump housing 10.

[0062] For internal gear ring 20, such as Figure 4 As shown, in some embodiments, the internal gear ring 20 is provided with a first oil passage hole 201, which extends from the inner circumferential surface of the internal gear ring 20 to the outer circumferential surface of the internal gear ring 20. The first oil passage hole 201 connects to the oil suction chamber 10a, and also connects to the first oil inlet hole 112 and the second oil inlet hole 122. This structure allows the first oil passage hole 201 to provide an oil passage path for the first oil inlet hole 112 and the second oil inlet hole 122, while also guiding the oil to the inter-tooth meshing portion to form an oil film, thereby reducing the impact and load during meshing of the internal gear ring 20 and the gear shaft 30. Exemplarily, the first oil passage hole 201 is connected to the first connecting hole 124, and the oil suction chamber 10a is connected to the first oil inlet hole 112 and the second oil inlet hole 122 through the first oil passage hole 201 and the first connecting hole 124, respectively.

[0063] The internal gear ring 20 is provided with a second oil passage hole 202, which extends from the inner circumferential surface of the internal gear ring 20 to the outer circumferential surface of the internal gear ring 20. The second oil passage hole 202 is connected to the oil pressure chamber 10b, and is also connected to the first oil outlet hole 113 and the second oil outlet hole 123. For example, the second oil passage hole 202 is connected to the second connecting hole 125, and the oil pressure chamber 10b is connected to the first oil outlet hole 113 and the second oil outlet hole 123 through the second oil passage hole 202 and the second connecting hole 125, respectively.

[0064] In summary, the internal gear pump of this application has a first oil inlet 112 and a second oil outlet 123 connected to the oil suction chamber 10a, and a first oil outlet 113 and a second oil outlet 123 connected to the oil pressure chamber 10b. This allows users to connect the external pipeline using the other set of oil inlets when one set of oil inlets / outlets is inconvenient to install, thereby expanding the application scenarios of the internal gear pump.

[0065] Based on the same technical concept, one embodiment of this application also provides a hydraulic system including a drive component and the internal gear pump described in any of the above embodiments. Specifically, the drive component includes a motor and a transmission box, the transmission box fixing the gear shaft 30, and the motor driving the gear shaft 30 to rotate through the transmission box.

[0066] For the structure of the internal gear pump, please refer to the descriptions of the above embodiments; further details will not be provided here.

[0067] It should be noted that the preferred embodiments of the present application are described in the specification and its attached drawings, but the present application can be implemented in many different forms and is not limited to the embodiments described in the specification, and these embodiments are not intended to be additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Furthermore, each of the above technical features continues to combine to form various embodiments not listed above, which are considered to be within the scope of the present application specification; further, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes shall fall within the scope of protection of the claims of the present application.

Claims

1. An internal gear pump characterized by, The application relates to an internal meshing gear pump. The pump shell comprises a first wall surface and a second wall surface, the first wall surface is provided with a first oil inlet hole and a first oil outlet hole, the second wall surface is provided with a second oil inlet hole and a second oil outlet hole; An inner gear ring is arranged in the pump shell; A gear shaft is rotatably arranged in the pump shell, the gear shaft is engaged with the inner gear ring, and a crescent-shaped cavity is arranged between the gear shaft and the inner gear ring; A crescent plate is arranged in the crescent-shaped cavity, two sides of the crescent plate along the circumference are respectively provided with an oil suction cavity and an oil pressing cavity, the first oil inlet hole and the second oil inlet hole are communicated with the oil suction cavity, and the first oil outlet hole and the second oil outlet hole are communicated with the oil pressing cavity.

2. The internal gear pump of claim 1, wherein, A first communication hole is arranged in the pump shell, the first communication hole is communicated with the oil suction cavity, and the first communication hole is also communicated with the first oil inlet hole and the second oil inlet hole; and / or A second communication hole is arranged in the pump shell, the second communication hole is communicated with the oil pressing cavity, and the second communication hole is also communicated with the first oil outlet hole and the second oil outlet hole.

3. The internal gear pump of claim 1, wherein, The inner gear ring is provided with a first oil passing hole, the first oil passing hole extends from the inner circumferential surface of the inner gear ring to the outer circumferential surface of the inner gear ring, the first oil passing hole is communicated with the oil suction cavity, and the first oil passing hole is also communicated with the first oil inlet hole and the second oil inlet hole; and / or The inner gear ring is provided with a second oil passing hole, the second oil passing hole extends from the inner circumferential surface of the inner gear ring to the outer circumferential surface of the inner gear ring, the second oil passing hole is communicated with the oil pressing cavity, and the second oil passing hole is also communicated with the first oil outlet hole and the second oil outlet hole.

4. The internal gear pump of claim 1, wherein, The pump shell comprises a first cover body, a pump body and a second cover body which are sequentially connected, the first cover body, the pump body and the second cover body form an accommodating cavity, the inner gear ring and the crescent plate are accommodated in the accommodating cavity, and the gear shaft is at least partially arranged in the accommodating cavity; The first cover body is provided with the first oil inlet hole and the first oil outlet hole, and / or the pump body is provided with the second oil inlet hole and the second oil outlet hole.

5. The internal gear pump of claim 4, wherein, The first cover body, the pump body and the second cover body are sequentially arranged along the axial direction of the gear shaft, and one side of the first cover body away from the pump body is provided with the first wall surface; One side of the pump body is provided with the second wall surface along the circumferential direction of the gear shaft.

6. The internal gear pump of claim 4, wherein, The second cover body is provided with a shaft hole communicated with the accommodating cavity, one end of the gear shaft passes through the shaft hole and extends to the outside of the pump shell.

7. The internal gear pump of claim 1 wherein, The diameter of the first oil inlet hole is larger than the diameter of the first oil outlet hole; and / or The diameter of the second oil inlet hole is larger than the diameter of the second oil outlet hole.

8. The internal gear pump of any one of claims 1-7, wherein, The internal meshing gear pump comprises a first cover plate which is detachably mounted on the first wall surface and is used for closing the first oil inlet hole and the first oil outlet hole; or The internal meshing gear pump comprises a second cover plate which is detachably mounted on the second wall surface and is used for closing the second oil inlet hole and the second oil outlet hole.

9. The internal gear pump of any one of claims 1-7, wherein, The pump housing is provided with a first detection oil hole, the first detection oil hole is communicated with the first oil inlet hole and / or the second oil inlet hole, and the first detection oil hole is used for installing a sensor; and / or The pump housing is provided with a second detection oil hole, the second detection oil hole is communicated with the first oil outlet hole and / or the second oil outlet hole, and the second detection oil hole is used for installing a sensor.

10. A hydraulic system characterized by, An internal gear pump comprising the features of any one of claims 1-9.

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