Axial clearance compensation structure of high-pressure-resistant internal gear pump and internal gear pump thereof

Abstract

The axial clearance compensation structure of the high-pressure-resistant internal gear pump comprises a crescent sealing ring, the shape of the crescent sealing ring is similar to that of a crescent groove in a pump body, the crescent sealing ring is arranged in the crescent groove, and the crescent sealing ring is arranged in the crescent groove. The thickness of the crescent sealing ring is larger than the depth of the crescent groove, and the thickness of the sealing ring is larger than the depth of the crescent groove after the valve plate and the pump body are installed and extrude the sealing ring, so that a gap is formed between the pump body and the valve plate after the valve plate and the pump body are installed, and the axial gap of the gear pump is compensated. A crescent sealing ring is arranged in the crescent groove, so that a gap is formed between the pump body and the valve plate after the valve plate and the pump body are mounted, the axial gap of the gear pump is compensated, and the gear pump can be suitable for endurance tests of the pump running under higher pressure and frequent high-low pressure switching.

Description

TECHNICAL FIELD

[0001] The utility model relates to an axial gap compensation structure of high-pressure-resistant internal meshing gear pump and internal meshing gear pump belong to electro -hydraulic motor pump technical field. BACKGROUND

[0002] In the electro -hydraulic motor unit, the stability of internal meshing gear pump displacement and the guarantee of higher volumetric efficiency need to use axial compensation structure, the internal meshing gear pump axial compensation structure in the prior electro -hydraulic motor pump cannot be applicable to the durability test of operation under higher pressure and frequent high-low pressure switching. SUMMARY

[0003] In view of the deficiency of prior art, the utility model discloses a kind of axial gap compensation structure of high-pressure-resistant internal meshing gear pump and internal meshing gear pump, which can be applicable to operation under higher pressure and can satisfy the durability test of frequent high-low pressure switching.

[0004] To achieve the foregoing utility model purposes, the utility model adopts the technical scheme that includes:

[0005] The utility model discloses an axial gap compensation structure of high-pressure-resistant internal meshing gear pump in one aspect, including crescent sealing ring, the shape of the crescent sealing ring is similar with the shape of moon slot on pump body, the crescent sealing ring is arranged in moon slot, the thickness of the crescent sealing ring is greater than the depth of moon slot, the thickness of the sealing ring after extrusion sealing ring is installed with the pump body and the flow distribution disc is greater than the depth of moon slot, so that there is gap between the pump body and the flow distribution disc after the flow distribution disc is installed with the pump body, to compensate the axial gap of gear pump.

[0006] Further, the outer side of the crescent sealing ring is provided with a notched groove, the notched groove is arranged in the moon slot, the shape of the notched groove is similar with the shape of the moon slot, a crescent check ring is arranged in the notched groove, and the crescent check ring is used at least to block the crescent sealing ring to prevent the crescent sealing ring from being separated from the moon slot.

[0007] Further, the height of the sealing ring after compression is higher than the height of the crescent check ring.

[0008] Further, the crescent check ring is a plastic check ring.

[0009] The utility model discloses an internal meshing gear pump in another aspect, including pump body and flow distribution disc, moon slot is provided on the pump body, the axial gap compensation structure of high-pressure-resistant internal meshing gear pump is arranged in the moon slot, there is gap between the pump body and the flow distribution disc after the pump body, the flow distribution disc and the axial gap compensation structure of high-pressure-resistant internal meshing gear pump are assembled.

[0010] Furthermore, after the axial clearance compensation structure of the pump body, the distribution plate, and the high-pressure internal gear pump is assembled, the clearance between the pump body and the distribution plate is 0.7-1.0 mm.

[0011] Compared with the prior art, the advantages of this utility model include:

[0012] 1) The axial clearance compensation structure of the high-pressure internal meshing gear pump provided by this utility model is provided with a crescent sealing ring in the crescent groove, so that there is a gap between the pump body and the distribution plate after the distribution plate is installed, so as to compensate for the axial clearance of the gear pump. It can be used for durability tests of pump operation under high pressure and frequent high and low pressure switching.

[0013] 2) The axial clearance compensation structure of the high-pressure internal gear pump provided by this utility model includes a crescent-shaped retaining ring in the notch groove. The crescent-shaped retaining ring is used to block the crescent-shaped sealing ring and prevent the crescent-shaped sealing ring from detaching from the crescent groove. During use, the crescent-shaped retaining ring, together with the crescent-shaped sealing ring, plays the role of axial clearance compensation. On the other hand, the crescent-shaped retaining ring can prevent the crescent-shaped sealing ring from undergoing excessive deformation and detaching from the mounting groove on the pump body under high-pressure operating conditions. At the same time, the crescent-shaped retaining ring can also prevent the crescent-shaped sealing ring from shearing or breaking under the high-low pressure switching durability test environment.

[0014] 3) The axial clearance compensation structure of the high-pressure internal gear pump provided by this utility model is simple and compact, does not affect the volumetric efficiency of the gear pump itself, is easy to maintain, extends the service life of the crescent seal ring in the internal gear pump, and has low production cost, enabling mass production. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the axial clearance compensation structure of a high-pressure internal meshing gear pump provided in a typical embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal gear pump provided in a typical embodiment of this utility model;

[0018] Figure 3 This is a partial structural schematic diagram of an internal gear pump provided in a typical embodiment of this utility model;

[0019] Explanation of reference numerals in the attached diagram: 1. Crescent-shaped sealing ring; 2. Distribution plate; 3. Pump body; 5. Crescent-shaped retaining ring. Detailed Implementation

[0020] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0021] like Figure 1 As shown, this utility model discloses an axial clearance compensation structure for a high-pressure internal gear pump, including a crescent-shaped sealing ring 1. The crescent-shaped sealing ring 1 has a shape similar to the crescent groove on the pump body 3. The crescent-shaped sealing ring 1 is disposed in the crescent groove, and the thickness of the crescent-shaped sealing ring 1 is greater than the depth of the crescent groove. After the distribution plate 2 and the pump body 3 are installed with the compression sealing ring, the thickness of the sealing ring is greater than the depth of the crescent groove, so that there is a gap between the pump body 3 and the distribution plate 2 after the distribution plate 2 and the pump body 3 are installed, so as to compensate for the axial clearance of the gear pump. It is suitable for durability tests of pumps operating under high pressure and frequent high and low pressure switching.

[0022] This utility model has a simple and compact structure, does not affect the volumetric efficiency of the gear pump, is easy to maintain, extends the service life of the crescent seal ring 1 in the internal gear pump, and has low production cost, enabling mass production.

[0023] Based on the above, such as Figure 1 , Figure 2 , Figure 3 As shown, a notch is provided on the outer side of the crescent-shaped sealing ring 1. The notch is located within the crescent-shaped groove, and its shape is similar to that of the crescent-shaped groove. A crescent-shaped retaining ring 5 is provided within the notch. The crescent-shaped retaining ring 5 is used to at least block the crescent-shaped sealing ring 1, preventing it from detaching from the crescent-shaped groove. During use, the crescent-shaped retaining ring 5, together with the crescent-shaped sealing ring 1, plays a role in axial clearance compensation. On the other hand, the crescent-shaped retaining ring 5 can prevent the crescent-shaped sealing ring 1 from undergoing excessive deformation and detaching from the mounting groove on the pump body 3 under high-pressure operating conditions. At the same time, the crescent-shaped retaining ring 5 can also prevent the crescent-shaped sealing ring 1 from shearing or breaking under the conditions of high-low pressure switching durability test.

[0024] Based on the above, the height of the compressed sealing ring is higher than the height of the crescent retaining ring 5, so that during use, the distribution plate 2 presses the crescent sealing ring 1 to form a sealing structure.

[0025] In some implementations, the crescent-shaped retaining ring 5 is a plastic retaining ring.

[0026] Another aspect of this utility model discloses an internal meshing gear pump, such as...Figure 2 As shown, the pump includes a pump body 3 and a distribution plate 2. The pump body 3 is provided with a crescent groove, and an axial clearance compensation structure for a high-pressure internal gear pump is provided in the crescent groove. After the pump body 3, the distribution plate 2 and the axial clearance compensation structure for the high-pressure internal gear pump are assembled, there is a gap between the pump body 3 and the distribution plate 2, which can realize axial compensation for the internal gear pump, enabling the internal gear pump to operate under high pressure and withstand durability tests with frequent high and low pressure switching.

[0027] In some implementation cases, after the axial clearance compensation structure of the pump body 3, the distribution plate 2 and the high-pressure internal gear pump are assembled, the clearance between the pump body 3 and the distribution plate 2 is 0.7-1.0mm. The clearance between the assembled pump body 3 and the distribution plate 2 can be 0.7mm, 0.8mm, 0.9mm or 1.0mm. The clearance between the assembled pump body 3 and the distribution plate 2 is determined by the axial distance to be compensated.

[0028] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An axial gap compensation structure for a high pressure resistant internal gear pump, characterized by: The application relates to an axial gap compensation structure of a high-pressure-resistant internal meshing gear pump, which comprises a crescent sealing ring (1) which is similar in shape to a crescent groove on a pump body (3), is arranged in the crescent groove, and has a thickness greater than the depth of the crescent groove; and after an extrusion sealing ring is arranged between a distribution disc (2) and the pump body (3), the thickness of the sealing ring is greater than the depth of the crescent groove, so that a gap is formed between the pump body (3) and the distribution disc (2) after the pump body (3) and the distribution disc (2) are assembled, and the axial gap of the gear pump is compensated.

2. The axial gap compensation structure for a high pressure resistant internal gear pump according to claim 1, characterized by: The outer side of the crescent sealing ring (1) is provided with a notch groove which is arranged in the crescent groove, is similar in shape to the crescent groove, and is provided with a crescent check ring (5) which is used for at least blocking the crescent sealing ring (1) and preventing the crescent sealing ring (1) from being separated from the crescent groove.

3. The axial gap compensation structure for a high pressure resistant internal gear pump according to claim 2, characterized by: The height of the sealing ring after compression is higher than the height of the crescent check ring (5).

4. The axial gap compensation structure for a high pressure resistant internal gear pump according to claim 2, characterized by: The crescent check ring (5) is a plastic check ring.

5. An internal gear pump characterized by: The application further relates to a high-pressure-resistant internal meshing gear pump which comprises a pump body (3) and a distribution disc (2), the pump body (3) is provided with a crescent groove, the crescent groove is provided with the axial gap compensation structure of the high-pressure-resistant internal meshing gear pump according to any one of claims 1-4, and a gap is formed between the pump body (3) and the distribution disc (2) after the pump body (3), the distribution disc (2) and the axial gap compensation structure of the high-pressure-resistant internal meshing gear pump are assembled.

6. The internal gear pump of claim 5, wherein: The gap between the pump body (3) and the distribution disc (2) after the pump body (3), the distribution disc (2) and the axial gap compensation structure of the high-pressure-resistant internal meshing gear pump are assembled is 0.7-1.0 mm.

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