Axially compensated internal gear pump

Abstract

The utility model provides a kind of internal meshing gear pump of axial compensation, including pump body, pump cover, inner gear ring and the external gear meshing in inner gear ring, inner gear ring and pump body, pump cover between are equipped with oil distribution disc and rubber ring, the inner side surface of oil distribution disc and the end surface of inner gear ring contact fit, outer side surface and rubber ring contact fit, pump body and pump cover are all equipped with the positioning groove for installing rubber ring, the height of the rubber ring is greater than the depth of positioning groove, the side wall of positioning groove is provided with oil groove. The gear pump provided by the utility model can realize positive and negative rotation pump oil, and by setting the positioning groove for installing rubber ring on pump body and pump cover, and setting oil groove on the side wall of positioning groove, high-pressure oil of oil pump can be introduced into positioning groove, rubber ring is pushed close to oil distribution disc using oil pressure, and then oil distribution disc is close to gear pair, to ensure the axial sealing effect of gear pump.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically to an axially compensated internal meshing gear pump. Background Technology

[0002] Internal gear pumps, as a common type of pump, are widely used in various industrial applications. Traditional internal gear pumps are typically designed for unidirectional rotation, meaning they can only pump oil in one direction. However, with the continuous development of industrial technology, higher demands are placed on the flexibility and adaptability of pumping equipment. An internal gear pump has an internal gear and an external gear, with the external gear eccentrically positioned within and meshing with the internal gear. To seal the pump chamber, side plates are tightly fitted to the ends of both the internal and external gears. The pump chamber is the space between the two gears, extending circumferentially from the pump inlet to the pump outlet. The side plates usually have shaft holes through which the pump shaft passes. To ensure the sealing effect of the side plates, a sealing ring is typically installed between the side plates and the pump casing. Utility Model Content

[0003] The purpose of this invention is to provide an axially compensated internal gear pump, which improves the pump's sealing performance through the axial compensation function of the sealing ring.

[0004] The technical solution of this utility model is: an axially compensated internal gear pump, including a pump body, a pump cover, an internal gear ring, and an external gear meshing with the internal gear ring. An oil distribution plate and a rubber ring are installed between the internal gear ring and the pump body and the pump cover. The inner side of the oil distribution plate contacts and engages with the end face of the internal gear ring, and the outer side contacts and engages with the rubber ring. The pump body and the pump cover are provided with positioning grooves for installing the rubber ring. The height of the rubber ring is greater than the depth of the positioning groove, and an oil inlet groove is provided on the side wall of the positioning groove.

[0005] As a preferred technical solution, the cross-sectional structure of the rubber ring is L-shaped, wider at the top and narrower at the bottom, with the narrow end located in the positioning groove of the pump body or pump cover.

[0006] In one embodiment, the oil distribution plate is provided with an eccentric shaft hole, the inner side of the oil distribution plate is provided with two oil passage grooves, the bottom of the oil passage groove is provided with two oil passage holes, and the narrow end of the oil passage groove is provided with an unloading groove to reduce pressure fluctuations.

[0007] In one embodiment, the number of positioning grooves and rubber rings is four; the outer periphery of both the positioning grooves and the oil passage grooves is crescent-shaped.

[0008] In one embodiment, a crescent-shaped cavity is formed between the internal gear ring and the external gear, and a filler is disposed in the cavity.

[0009] The gear pump provided by this utility model can realize forward and reverse rotation for pumping oil. By setting positioning grooves for installing rubber rings on the pump body and pump cover, and setting oil inlet grooves on the side walls of the positioning grooves, the high-pressure oil of the oil pump can be introduced into the positioning grooves. The oil pressure pushes the rubber ring to stick to the oil distribution plate, thereby making the oil distribution plate stick to the gear pair, ensuring the axial sealing effect of the gear pump. Attached Figure Description

[0010] Figure 1 This is a partial cross-sectional view of the gear pump in an embodiment of the present invention.

[0011] Figure 2 for Figure 1 A partially enlarged structural diagram;

[0012] Figure 3 This is a schematic diagram of the pump body structure in an embodiment of the present utility model;

[0013] Figure 4 for Figure 3 A magnified structural diagram of part A in the diagram;

[0014] Figure 5 This is a schematic diagram of the oil distribution plate structure in an embodiment of the present utility model;

[0015] Figure 6 for Figure 5 A magnified structural diagram of part B in the diagram;

[0016] The attached figures are labeled as follows:

[0017] 10. Pump body; 20. Pump cover; 30. Internal gear ring; 40. External gear; 50. Oil distribution plate; 51. Oil passage groove; 52. Oil passage hole; 53. Unloading groove; 60. Rubber ring; 70. Positioning groove; 71. Oil inlet groove. Detailed Implementation

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0019] It should be noted in advance that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] like Figures 1 to 6As shown, an axially compensated internal gear pump includes a pump body 10, a pump cover 20, an internal gear ring 30, and an external gear 40 internally meshing with the internal gear ring 30. A crescent-shaped cavity is formed between the internal gear ring 30 and the external gear 40, and a filler is provided in the cavity. An oil distribution plate 50 and a rubber ring 60 are installed between the internal gear ring 30 and the pump body 10 and the pump cover 20. The inner side of the oil distribution plate 50 contacts and engages with the end face of the internal gear ring 30, and the outer side contacts and engages with the rubber ring 60. The pump body 10 and the pump cover 20 are provided with positioning grooves 70 for installing the rubber ring 60. The height of the rubber ring 60 is greater than the depth of the positioning groove 70. An oil inlet groove 71 is provided on the side wall of the positioning groove 70. The cross-sectional structure of the rubber ring 60 is L-shaped, wider at the top and narrower at the bottom, with the narrow end located in the positioning groove 70 of the pump body 10 or the pump cover 20.

[0021] In this embodiment, the oil distribution plate 50 is provided with an eccentric shaft hole, the inner side of the oil distribution plate 50 is provided with two oil passage grooves 51, the bottom of the oil passage grooves 51 is provided with two oil passage holes 52, and the narrow end of the oil passage grooves 51 is provided with a load relief groove 53 to reduce pressure fluctuations.

[0022] In this embodiment, there are four positioning grooves 70 and four rubber rings 60; the outer periphery of both the positioning groove 70 and the oil passage groove 51 is crescent-shaped.

[0023] The gear pump provided in this embodiment can pump oil in both forward and reverse rotation. By setting a positioning groove 70 for installing a rubber ring 60 on the pump body 10 and the pump cover 20, and setting an oil inlet groove 71 on the side wall of the positioning groove 70, the high-pressure oil of the oil pump can be introduced into the positioning groove 70. The oil pressure pushes the rubber ring 60 to stick to the oil distribution plate 50, thereby making the oil distribution plate 50 stick to the gear pair, ensuring the axial sealing effect of the gear pump.

[0024] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

[0025] To facilitate understanding by those skilled in the art of the improvements of this utility model over the prior art, some of the drawings and descriptions of this utility model have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this utility model.

Claims

1. An axially compensated internal gear pump, comprising a pump body (10), a pump cover (20), an internal gear ring (30), and an external gear (40) internally meshing with the internal gear ring (30), characterized in that: An oil distribution plate (50) and a rubber ring (60) are installed between the internal gear ring (30) and the pump body (10) and the pump cover (20). The inner side of the oil distribution plate (50) is in contact with the end face of the internal gear ring (30), and the outer side is in contact with the rubber ring (60). The pump body (10) and the pump cover (20) are provided with positioning grooves (70) for installing the rubber ring (60). The height of the rubber ring (60) is greater than the depth of the positioning groove (70). The side wall of the positioning groove (70) is provided with an oil inlet groove (71).

2. The axially compensated internal gear pump according to claim 1, characterized in that: The cross-sectional structure of the rubber ring (60) is L-shaped, wider at the top and narrower at the bottom, with the narrow end located in the positioning groove (70) of the pump body (10) or pump cover (20).

3. The axially compensated internal gear pump according to claim 1 or 2, characterized in that: The oil distribution plate (50) is provided with an eccentric shaft hole. The inner side of the oil distribution plate (50) is provided with two oil passage grooves (51). The bottom of the oil passage groove (51) is provided with two oil passage holes (52). The narrow end of the oil passage groove (51) is provided with a load relief groove (53) to reduce pressure fluctuation.

4. The axially compensated internal gear pump according to claim 1 or 2, characterized in that: The number of positioning grooves (70) and rubber rings (60) is four; the outer periphery of positioning grooves (70) and oil grooves (51) is crescent-shaped.

5. The axially compensated internal gear pump according to claim 1 or 2, characterized in that: A crescent-shaped cavity is formed between the internal gear ring (30) and the external gear (40), and a filler is provided in the cavity.

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