Internal gear pump and hydraulic system

Abstract

The embodiment of the utility model relates to the technical field of gear pumps, and discloses an internal gear pump and a hydraulic system.The internal gear pump comprises a pump body, an inner gear ring, a gear, a crescent plate assembly and a valve plate; the inner gear ring is arranged in the pump body; the gear is rotatably arranged in the pump body, the gear is meshed with the inner gear ring, and a first cavity, a second cavity and a third cavity are formed between the gear and the inner gear ring; the crescent plate assembly is arranged in the third cavity, the crescent plate assembly abuts against the inner gear ring and the gear, a transition cavity is formed between the crescent plate assembly and the inner gear ring, and the first cavity and the second cavity are located on the two sides of the third cavity in the circumferential direction of the crescent plate assembly respectively; the valve plate is arranged in the pump body and abuts against the inner gear ring, the gear and the crescent plate assembly in the axial direction of the inner gear ring. In this way, the technical problem that vibration noise of the crescent plate assembly is large due to sudden change of oil pressure can be solved.

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] At present, a conventional internal meshing gear pump usually 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 area, and the chamber where the two gears are about to engage is an oil pressing area. 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 area where the two gears are disengaged increases, forming negative pressure, and oil is sucked from the oil inlet of the pump body, while the closed space volume of the oil pressing area where the two gears are about to engage decreases, and oil is pressed out from the oil outlet of the pump body. However, the internal meshing gear pump generates a large noise due to vibration caused by sudden change of oil pressure under high-speed rotation, which may affect the service life to some extent as the use time accumulates. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to provide an internal meshing gear pump and a hydraulic system to improve the technical problem of large vibration noise of the internal meshing gear pump caused by sudden change of oil pressure in the related art.

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

[0005] a pump body;

[0006] an inner gear ring arranged in the pump body;

[0007] a gear rotatably arranged in the pump body, the gear is in meshing with the inner gear ring, and a first chamber, a second chamber and a third chamber are arranged between the gear and the inner gear ring;

[0008] a crescent plate assembly arranged in the third chamber, the crescent plate assembly abuts against the inner gear ring and the gear respectively, a transition chamber is arranged between the crescent plate assembly and the inner gear ring, and the first chamber and the second chamber are respectively located on both sides of the third chamber along the circumferential direction of the crescent plate assembly;

[0009] a distribution disc arranged in the pump body, the distribution disc abuts against the inner gear ring, the gear and the crescent plate assembly along the axial direction of the inner gear ring;

[0010] The distribution disc is provided with a first communication hole and a first oil passage hole, and the first communication hole and the first oil passage hole respectively penetrate the distribution disc along the axial direction of the inner ring gear, one end of the first communication hole communicates with the transition chamber, one end of the first oil passage hole communicates with the first chamber, and the other end of the first communication hole and the other end of the first oil passage hole communicate.

[0011] Optionally, the distribution disc is provided with a first buffer groove on the side facing the crescent plate, and one end of the first buffer groove communicates with the first communication hole along the circumferential direction of the inner ring gear.

[0012] Optionally, the width of the first buffer groove decreases in sequence from one end of the first buffer groove facing the first communication hole to the other end of the first buffer groove.

[0013] Optionally, the pump body comprises a pump shell and an end cover connected to each other, and the pump shell and the end cover enclose a pump cavity, and the inner ring gear and the gear are arranged in the pump cavity, respectively.

[0014] The end cover is provided with a first oil passage, and the side of the distribution disc away from the crescent plate assembly abuts against the end cover, and the first oil passage hole communicates with the first oil passage.

[0015] Optionally, the end cover is provided with a first communication groove on the side facing the distribution disc, and the first communication groove communicates the first oil passage and the first oil passage hole.

[0016] Optionally, the distribution disc is provided with a groove on the side facing the crescent plate assembly, and the groove communicates the first chamber and the first oil passage hole.

[0017] Optionally, the distribution disc is further provided with a second oil passage hole, the second oil passage hole communicates the groove and the first communication groove, and the other end of the second oil passage hole and the other end of the first communication hole communicate; and / or

[0018] The distribution disc is further provided with a second buffer groove on the side facing the crescent plate, and one end of the second buffer groove communicates with the groove along the circumferential direction of the inner ring gear.

[0019] Optionally, the crescent plate assembly comprises a crescent main plate and a crescent auxiliary plate abutting against each other, and a gap is arranged between the crescent main plate and the crescent auxiliary plate.

[0020] The distribution disc is further provided with a second communication hole, and the second communication hole penetrates the distribution disc along the axial direction of the inner ring gear, and the two ends of the second oil passage hole respectively communicate with the gap and the first oil passage.

[0021] Optionally, the number of the flow distribution discs is two, and the two flow distribution discs are respectively arranged on two sides of the inner ring gear in the axial direction of the inner ring gear.

[0022] According to a second aspect of the present application, a hydraulic system is provided, comprising the internal gear pump as described above.

[0023] The beneficial effects of the embodiments of the present application are as follows: the first communication holes respectively communicate the first chamber and the transition chamber, so that the oil pressure of the transition chamber can be balanced with the oil pressure of the first chamber, that is, the oil pressure of the two sides of the crescent plate assembly in the radial direction is balanced, thereby reducing the vibration and noise of the internal gear pump. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the following description of the embodiments or the prior art will be briefly introduced. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0025] Figure 1 An exploded view of the structure of an internal gear pump according to one of the embodiments of the present application is provided;

[0026] Figure 2 A sectional view of an internal gear pump according to one of the embodiments of the present application is provided;

[0027] Figure 3 A sectional view of an internal gear pump according to one of the embodiments of the present application is provided; Figure 1 An assembly plane schematic diagram between the oil distribution disc, the crescent plate assembly, the gear and the inner ring gear in the internal gear pump is shown;

[0028] Figure 4 An assembly plane schematic diagram between the oil distribution disc, the crescent plate assembly, the gear and the inner ring gear in the internal gear pump is shown; Figure 1 A plane schematic diagram of the oil distribution disc in the internal gear pump is shown;

[0029] Figure 5 A plane schematic diagram of the oil distribution disc in the internal gear pump is shown; Figure 1 A partial structure exploded view of the oil distribution disc, the arc-shaped sealing gasket and the end cover in the internal gear pump is shown;

[0030] Figure 6 A partial structure exploded view of the oil distribution disc, the arc-shaped sealing gasket and the end cover in the internal gear pump is shown; Figure 1 A partial structure exploded view of the internal gear pump is shown;

[0031] Figure 7 A partial structure exploded view of the internal gear pump is shown; Figure 1 Another partial structure exploded view of the internal gear pump is shown;

[0032] Figure 8 Another partial structure exploded view of the internal gear pump is shown; Figure 3 An exploded view of the structure of the crescent plate assembly is shown;

[0033] BRIEF DESCRIPTION OF DRAWINGS

[0034] 10 pump body; 10a pump cavity; 11 pump shell; 12 end cover; 121 first oil passage; 122 first communication groove;

[0035] 1a first chamber; 1b second chamber; 1c transition chamber;

[0036] 20 inner gear ring;

[0037] 30 gear;

[0038] 40 crescent plate assembly; 41 crescent main plate; 42 crescent auxiliary plate;

[0039] 50 oil distribution disc; 501 first communication hole; 502 first oil passage hole; 503 first buffer groove; 504 recess; 505 second oil passage hole; 506 second buffer groove; 507 second communication hole;

[0040] 60 arc-shaped sealing washer. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. 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.

[0042] The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the description of the application where appropriate.

[0043] 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 based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without 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.

[0044] In the description of the present application, it should be noted that the use of "first", "second", and the like words to limit 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 limiting the scope of protection of the present application.

[0045] 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.

[0046] Please refer to Figures 1 to 8 , one embodiment of the present application provides an internal gear pump, which comprises a pump body 10, an inner gear ring 20, a gear 30 and a crescent plate assembly 40. The inner gear ring 20 is arranged in the pump body 10, the gear 30 is rotatably arranged in the pump body 10, and the gear 30 is engaged with the inner gear ring 20. The first chamber 1a, the second chamber 1b and the third chamber (not marked in the figure) are arranged between the gear 30 and the inner gear ring 20. The crescent plate assembly 40 is arranged in the third chamber, and the crescent plate assembly 40 abuts against the inner gear ring 20 and the gear 30 respectively. The transition chamber 1c is arranged between the crescent plate assembly 40 and the inner gear ring 20. Along the circumference of the crescent plate assembly 40, the first chamber 1a and the second chamber 1b are respectively located on the two sides of the third chamber. The distributor plate 50 is arranged in the pump body 10, and the distributor plate 50 abuts against the inner gear ring 20, the gear 30 and the crescent plate assembly 40 along the axial direction of the inner gear ring 20. The distributor plate 50 is provided with the first communication hole 501 and the first oil passage hole 502, and the first communication hole 501 and the first oil passage hole 502 respectively penetrate the oil distribution plate along the axial direction of the inner gear ring 20. The one end of the first communication hole 501 connected with the transition chamber 1c, and the one end of the first oil passage hole 502 connected with the first chamber 1a, and the other end of the first communication hole 501 and the other end of the first oil passage hole 502 are communicated.

[0047] As Figure 1 , Figure 6 or Figure 7 indicated, in some embodiments, the number of distributor plates 50 is two, and the two distributor plates 50 are arranged on the opposite sides of the inner gear ring 20 along the axial direction of the inner gear ring 20. Exemplarily, along the axial direction of the inner gear ring 20, the combination structure of one side wall of the pump body 10, one distributor plate 50, the inner gear ring 20, the gear 30 and the crescent plate assembly 40, the other distributor plate 50 and the other side wall of the pump body 10 are arranged in sequence.

[0048] Next, in order to facilitate the reader to understand the working principle of the internal gear pump of the present application, the gear 30 is taken as an example to rotate around the inner gear ring 20 as Figure 3The change of the oil liquid in the clockwise rotation direction is shown by way of example, wherein the first chamber 1a is a high-pressure oil chamber, and the second chamber 1b is a low-pressure oil chamber. The first communication hole 501 respectively communicates the first chamber 1a and the transition chamber 1c, so that the oil liquid pressure of the transition chamber 1c can be balanced with the oil liquid pressure of the first chamber 1a, that is, the oil liquid pressure on the two sides of the radial direction of the crescent plate assembly 40 is balanced, thereby reducing the vibration and noise of the internal gear pump.

[0049] Please refer to Figure 6 in combination with Figure 5 any figure, in some embodiments, the first buffer groove 503 is arranged on the side of the distribution plate 50 facing the crescent plate assembly 40. One end of the first buffer groove 503 communicates with the first communication hole 501 along the circumferential direction of the inner gear ring 20. Such a structure gradually increases the pressure space between the first buffer groove 503 and the inner gear ring 20, slowly transitions to high pressure, and enables the oil liquid to adapt to the change in high pressure in the high-pressure oil chamber in advance when reaching the high-pressure oil chamber, thereby providing a smooth process for the oil liquid to enter and exit between the inner gear ring 20 and the crescent plate assembly 40, and further reducing the vibration and noise of the internal gear pump. By way of example, the width of the first buffer groove 503 gradually decreases from the end of the first buffer groove 503 facing the first communication hole 501 to the other end of the first buffer groove 503.

[0050] It should be noted that in the embodiments of the present application, the first chamber 1a and the second chamber 1b are symmetrically arranged along the axial direction of the inner gear ring 20, and the structures on the left and right sides of the distribution plate 50 are symmetrically arranged. After the rotation direction of the gear 30 is changed, the structure of the present application is still effective. Since the high-pressure oil chamber and the low-pressure oil chamber are exchanged, the pressure space between the first buffer groove 503 and the inner gear ring 20 gradually increases, slowly transitions to high pressure, and thus can adapt to the change in high pressure in the high-pressure oil chamber in advance when reaching the high-pressure oil chamber.

[0051] As Figure 3 or Figure 4 shown, in some embodiments, the distribution plate 50 further comprises a second oil passage hole 505. The second oil passage hole 505 penetrates the distribution plate 50 along the axial direction of the inner gear ring 20. One end of the second oil passage hole 505 communicates with the first chamber 1a, and the other end of the second oil passage hole 505 communicates with the other end of the first communication hole 501. Such a structure can divide the oil liquid, reduce the flow resistance of the oil liquid, avoid pressure abnormalities caused by the obstruction of a single oil passage hole, and ensure the smooth operation of the internal gear pump.

[0052] As Figures 3 to 5As shown in any of the accompanying drawings, in some embodiments, one side of the distributor plate 50 facing the crescent plate assembly 40 is provided with a recess 504, which is in communication with the first chamber 1a and the first oil passage hole 502. By providing the recess 504 on the side of the distributor plate 50 facing the crescent plate assembly 40, the retention and accumulation of oil can be improved, the smooth flow of oil can be maintained, and the normal supply of oil in the first chamber 1a can be ensured.

[0053] In addition, the second oil passage hole 505 is in communication with the recess 504 and the first communication groove 122. The second oil passage hole 505 is arranged in a spaced manner with the first oil passage hole 502 along the circumference of the inner ring gear 20.

[0054] As shown in Figure 3 or Figure 4 In some embodiments, the other side of the distributor plate 50 facing the crescent plate assembly 40 is also provided with a second buffer groove 506, one end of which is in communication with the recess 504 along the circumference of the inner ring gear 20. In addition, the second buffer groove 506 is directly in communication with the first chamber 1a. Further, the width of the second buffer groove 506 decreases in sequence from the end of the second buffer groove 506 facing the recess 504 to the other end of the second buffer groove 506.

[0055] Based on the similar principle as the first buffer groove 503, the pressure increasing space between the second buffer groove 506 and the gear 30 gradually increases to slowly transition to high pressure, so that the oil can adapt to the change of high pressure in the oil chamber in advance when the oil reaches the oil chamber, and a smooth process of oil in and out between the gear 30 and the crescent plate assembly 40 is provided, which reduces the sudden change of oil pressure of the internal gear pump from the oil suction chamber to the oil chamber, further reduces the vibration and noise of the internal gear pump.

[0056] For the pump body 10, please refer to Figure 5 and Figure 1 in combination with Figure 2 As shown in some embodiments, the pump body 10 includes a pump shell 11 and an end cover 12 connected together, and the pump shell 11 and the end cover 12 enclose a pump cavity 10a, and the inner ring gear 20 and the gear 30 are arranged in the pump cavity 10a. Exemplarily, along the axial direction of the inner ring gear 20, the inner side wall of the pump shell 11, one of the distributor plates 50, the inner ring gear 20, the gear 30 and the combined structure of the crescent plate assembly 40, the other distributor plate 50 and the inner side wall of the end cover 12 are arranged in sequence.

[0057] The end cover 12 is provided with a first oil passage 121 for inputting or outputting oil in the first oil cavity. The end cover 12 is provided with a first communication groove 122 on the side facing the distribution plate 50, the first communication groove 122 is in communication with the first oil passage 121 and the first oil passage hole 502. In addition, the second oil passage hole 505 is in communication with the first oil passage 121. Exemplarily, the internal gear pump comprises an arc-shaped sealing gasket 60 abutting against the inner side wall of the end cover 12 and the oil distribution plate, and the arc-shaped sealing gasket 60, the end cover 12 and the oil distribution plate together form the first communication groove 122.

[0058] It can be understood that the first communication groove 122 can be formed in various ways, which will not be limited here. For example, in other embodiments, the first communication groove is formed by recessing inwardly from the inner side wall of the end cover 12.

[0059] It can also be understood that the embodiments of the present application do not specifically limit the way the distribution plate 50 is fixed to the pump body 10. For example, in some embodiments, the distribution plate 50 is fixed to the end cover 12 or the pump shell 11 by screws, positioning pins or other fixing members.

[0060] For the crescent plate assembly 40, please refer to Figure 8 Please refer to Figure 3 or Figure 7 In some embodiments, the crescent plate assembly 40 comprises a main crescent plate 41 and a secondary crescent plate 42, the inner arc segment of the main crescent plate 41 abuts against the tooth top surface of the gear 30, the secondary crescent plate 42 is arranged between the main crescent plate 41 and the inner ring gear 20, and the outer arc segment of the secondary crescent plate 42 abuts against the tooth top surface of the inner ring gear 20. A gap is provided between the main crescent plate 41 and the secondary crescent plate 42, and the distribution plate 50 is also provided with a second communication hole 507, which penetrates the distribution plate 50 along the axial direction of the inner ring gear 20, and the two ends of the second communication hole 507 are in communication with the gap and the first oil passage 121 respectively. Such a structure allows the oil in the first chamber la to fill into the gap between the main crescent plate 41 and the secondary crescent plate 42 through the second communication hole 507, and under the pressure of the oil, the main crescent plate 41 and the tooth top surface of the gear 30 are tightly attached, and the secondary crescent plate 42 and the tooth top surface of the inner ring gear 20 are tightly attached, thereby reducing the leakage of oil from the inter-tooth oil cavity.

[0061] In summary, the internal gear pump disclosed in the present application is provided with a first communication hole in communication with the first chamber and the transition chamber, so that the oil pressure in the transition chamber can be balanced with the oil pressure in the first chamber, that is, the oil pressure on the two sides of the crescent plate assembly in the radial direction is balanced, thereby reducing the vibration and noise of the internal gear pump.

[0062] Based on the same technical concept, one of the embodiments of the present application further provides a hydraulic system comprising a driving member and the internal gear pump according to any one of the above embodiments. Specifically, the driving member comprises a motor, and an output shaft of the motor penetrates the gear 30 to drive the gear 30 to rotate.

[0063] The structure of the internal gear pump can refer to the description of the above embodiments, and will not be described here.

[0064] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but the present application can be implemented in many different forms, and is not limited to the embodiments described in the specification. The embodiments are not 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, the above technical features continue to combine with each other to form various embodiments not listed above, which are considered to be within the scope of the present application. Furthermore, for those skilled in the art, the above description can be improved or changed, and all these improvements and changes should be within the protection scope of the claims of the present application.

Claims

1. An internal gear pump, characterized in that, include: Pump body; An internal gear ring is disposed within the pump body; A gear is rotatably disposed within the pump body, the gear meshing with the internal gear ring, and a first chamber, a second chamber, and a third chamber are provided between the gear and the internal gear ring; A crescent plate assembly is disposed in the third chamber. The crescent plate assembly abuts against the internal gear ring and the gear respectively. A transition chamber is provided between the crescent plate assembly and the internal gear ring. Along the circumference of the crescent plate assembly, the first chamber and the second chamber are located on both sides of the third chamber respectively. A distribution plate is disposed in the pump body and abuts against the internal gear ring, the gear, and the crescent plate assembly along the axial direction of the internal gear ring. The distribution plate is provided with a first connecting hole and a first oil passage hole. Along the axial direction of the internal gear ring, the first connecting hole and the first oil passage hole respectively penetrate the distribution plate. One end of the first connecting hole facing the crescent plate assembly is connected to the transition chamber, and one end of the first oil passage hole facing the crescent plate assembly is connected to the first chamber. The other end of the first connecting hole is connected to the other end of the first oil passage hole.

2. The internal gear pump according to claim 1, characterized in that, The distribution plate has a first buffer groove on the side facing the crescent plate assembly, and one end of the first buffer groove is connected to the first connecting hole along the circumference of the internal gear ring.

3. The internal gear pump according to claim 2, characterized in that, The width of the first buffer groove decreases sequentially from one end of the first buffer groove toward the first connecting hole to the other end of the first buffer groove.

4. The internal gear pump according to claim 1, characterized in that, The pump body includes a pump casing and an end cover connected together. The pump casing and the end cover enclose a pump cavity. The internal gear ring and the gear are respectively disposed in the pump cavity. The end cap is provided with a first oil passage, and the side of the distribution plate opposite to the crescent plate assembly abuts against the end cap. The first oil passage is connected to the first oil passage.

5. The internal gear pump according to claim 4, characterized in that, The end cap is provided with a first connecting groove on the side facing the distribution plate. The first connecting groove connects the first oil passage, the first connecting hole and the first oil passage hole respectively.

6. The internal gear pump according to claim 5, characterized in that, The distribution plate has a groove on the side facing the crescent plate assembly, and the groove connects the first chamber and the first oil passage.

7. The internal gear pump according to claim 6, characterized in that, The distribution plate is also provided with a second oil passage hole, which connects the groove and the first connecting groove; and / or The distribution plate is further provided with a second buffer groove on the side facing the crescent plate assembly, and one end of the second buffer groove is connected to the groove along the circumference of the internal gear ring.

8. The internal gear pump according to claim 1, characterized in that, The crescent plate assembly includes a crescent main plate and a crescent sub-plate that abut against each other, and a gap is provided between the crescent main plate and the crescent sub-plate; The distribution plate is also provided with a second connecting hole. Along the axial direction of the internal gear ring, the second connecting hole penetrates the distribution plate. One end of the second connecting hole facing the crescent plate is connected to the gap, and the other end of the second connecting hole is connected to the first oil passage hole.

9. The internal gear pump according to any one of claims 1-8, characterized in that, The number of distribution disks is two, and the two distribution disks are respectively arranged on both sides of the internal gear ring along the axial direction of the internal gear ring.

10. A hydraulic system, characterized in that, Including the internal gear pump as described in any one of claims 1-9.

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