Corrosion-resistant oil pump plunger seal structure

Abstract

The utility model relates to a kind of corrosion-resistant oil pump plunger sealing structure. Including: pump body, plunger end part and plunger cylinder part, plunger cylinder part is set at the center of plunger end part, plunger cylinder part is installed in pump body. Sealing structure further includes: gasket, first sealing member and second main sealing ring, gasket and first sealing member are all set between plunger end part and pump body, gasket and first sealing member are all set on plunger cylinder part, the inner diameter of gasket is greater than the outer diameter of first sealing member, first sealing member and plunger cylinder part interference fit, second main sealing ring is set in the sealing groove of plunger cylinder part. The sealing structure contains second main sealing ring for sealing ring, and the interference fit of sealing groove of plunger cylinder part, prevent the leakage of fuel in pump body from seeping out. The inner circumferential surface of gasket, pump body upper surface, plunger end part lower surface and plunger outer circumferential surface in the sealing structure are composed of sealing groove structure, play the role of limiting the radial and axial movement of first sealing member.

Description

Technical Field

[0001] This utility model relates to the field of oil pump sealing technology, and in particular to a corrosion-resistant oil pump plunger sealing structure. Background Technology

[0002] Common oil pumps have a main seal between the plunger and the pump body to prevent fuel leakage from inside the pump. However, exported oil pumps are now transported by sea, exposing them to prolonged salt spray conditions, which poses risks such as corrosion of the main seal, oil leakage, and rust on the internal camshaft. Summary of the Invention

[0003] This invention provides a corrosion-resistant oil pump plunger sealing structure that can prevent salt spray penetration and extend the service life of the second main sealing ring, thereby solving the technical problems mentioned in the background art.

[0004] The technical problem of this utility model is as follows: a corrosion-resistant oil pump plunger sealing structure, comprising: a pump body, a plunger end and a plunger column portion, wherein the plunger column portion is disposed at the center of the plunger end and is installed in the pump body.

[0005] The sealing structure also includes: a gasket, a first sealing element, and a second main sealing ring. The gasket and the first sealing element are both disposed between the plunger end and the pump body. The gasket and the first sealing element are both sleeved on the plunger body. The inner diameter of the gasket is larger than the outer diameter of the first sealing element. The first sealing element is interference-fitted with the plunger body. The second main sealing ring is disposed in the sealing groove of the plunger body.

[0006] Furthermore, the upper end face of the first seal forms a surface contact with the lower surface of the plunger end, and the lower end face of the first seal forms a surface contact with the upper surface of the pump body.

[0007] Furthermore, the upper end face of the first seal is provided with a chamfered structure on the side near the plunger body.

[0008] Furthermore, after installation, the upper surface of the gasket contacts the lower surface of the plunger end, the lower surface of the gasket contacts the upper surface of the pump body, and the thickness of the first seal is greater than or equal to the thickness of the gasket.

[0009] The beneficial effects of this utility model are as follows: the second main sealing ring included in the sealing structure is a sealing ring that is interference-fitted with the sealing groove of the plunger body to prevent fuel leakage from the pump body.

[0010] In this sealing structure, the inner circumferential surface of the gasket, the upper surface of the pump body, the lower surface of the plunger end, and the outer circumferential surface of the plunger form a sealing groove structure, which restricts the radial and axial movement of the first sealing element.

[0011] The first seal in this sealing structure, located before the second main sealing ring, can effectively reduce the erosion of the second main sealing ring by salt spray.

[0012] The first sealing element in this sealing structure has a rectangular cross-section, which makes surface contact with the upper surface of the pump body and the plunger, rather than line contact with the O-ring. This increases the contact area, and the sealing area can be further increased after the sealing element is squeezed and deformed. This more effectively prevents salt spray from entering and will not pop out of the gasket, thus losing the sealing function.

[0013] The inner wall of the first seal in this sealing structure is chamfered to avoid interference with the rounded corner of the plunger bottom and stress concentration in the seal, which could lead to cracking. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the overall structure of this utility model.

[0015] Figure 2 This is a cross-sectional view of the overall structure of this utility model after assembly.

[0016] Figure 3 This is a cross-sectional view of the main body of this utility model.

[0017] Figure 4 yes Figure 3 A magnified view of part A in the middle. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0019] In the technical solution of this utility model, Figure 1 and Figure 2 This is a structural schematic diagram of a corrosion-resistant oil pump plunger sealing structure according to the present invention, as shown in the diagram. Figure 1 and Figure 2 As shown, this utility model includes: The pump body 1 comprises a plunger end 4, a plunger column portion 6, a gasket 2, a first seal 3, and a second main seal ring 5. The plunger column portion 6 is located at the center of the plunger end 4 and is installed inside the pump body 1. Specifically, the two components can be integrally formed. The gasket 2 and the first seal 3 are both disposed between the plunger end 4 and the pump body 1. The gasket 2 and the first seal 3 are both sleeved on the plunger body 6. The inner diameter of the gasket 2 is larger than the outer diameter of the first seal 3. The first seal 3 is interference-fitted with the plunger body 6. The second main sealing ring 5 is disposed in the sealing groove of the plunger body 6.

[0020] In an embodiment of this utility model, the upper end face of the first sealing member 3 is in surface contact with the lower surface of the plunger end 4, and the lower end face 32 of the first sealing member 3 is in surface contact with the upper surface of the pump body 1.

[0021] In embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the upper end face of the first sealing member 3 is provided with a chamfered structure 31 on the side near the plunger body 6.

[0022] In an embodiment of this utility model, after installation, the upper surface of the gasket 2 contacts the lower surface of the plunger end 4, the lower surface of the gasket 2 contacts the upper surface of the pump body 1, and the thickness of the first sealing member 3 is greater than or equal to the thickness of the gasket 2.

[0023] The corrosion-resistant oil pump plunger seal structure provided in this embodiment is based on... Figure 1 and Figure 2 The pump body 1 and the plunger end 4 are included. The upper surface of the pump body 1 and the lower surface of the plunger end 4 are provided with a gasket 2. The inner wall of the gasket 2 and the upper surface of the pump body 1 are fixed with a first sealing element 3. A second main sealing ring 5 is provided in the sealing groove of the plunger body 6. The first sealing element 3, the plunger end 4, the plunger body 6, the second main sealing ring 5, the pump body 1, and the gasket 2 are axially aligned with the same center line.

[0024] The inner wall of the first seal 3 has a chamfered structure 31 at the contact surface with the plunger end 4, which can avoid interference with the rounded corner of the plunger end 4. The inner wall of the first seal 3 is smaller than the outer circle of the plunger body 6 (interference fit). The shrinkage of the sealing ring makes the first seal 3 fit tightly against the outer circle of the plunger body 6, blocking the entry of external gas and liquid. The lower surface of the first seal 3 is a planar structure, which is in surface contact with the upper surface of the pump body 1. The contact area is large. The inner wall of the upper surface of the pump body 1 has a chamfer. The planar structure of the lower surface of the first seal 3 can prevent it from sinking into the chamfered cavity when it is squeezed and deformed, avoiding the possibility of biting at this point. The outer surface of the first seal 3 is in surface contact with the inner wall of the gasket 2. When the first seal 3 is axially squeezed and deformed, the surface contact can prevent the first seal 3 from being squeezed out of the gasket 2 to the outside of the plunger end 4 and detaching from the plunger end 4, thus avoiding the situation where it fails to seal. When assembling the first sealing component 3, its actual height should not be lower than that of the gasket, so as not to affect the gasket's function of controlling the oil pump's pre-stroke.

[0025] This implementation case provides a corrosion-resistant oil pump plunger sealing structure, which includes two seals. The first seal 3 serves to prevent external salt spray from entering, and the second main sealing ring 5 serves to limit fuel leakage inside the pump body.

[0026] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A corrosion-resistant oil pump plunger seal structure, comprising: The pump body (1), plunger end (4) and plunger column part (6), wherein the plunger column part (6) is disposed at the center of the plunger end (4) and the plunger column part (6) is installed inside the pump body (1), characterized in that it further includes: gasket (2), first seal (3) and second main seal ring (5). The gasket (2) and the first seal (3) are both disposed between the plunger end (4) and the pump body (1). The gasket (2) and the first seal (3) are both sleeved on the plunger body (6). The inner diameter of the gasket (2) is larger than the outer diameter of the first seal (3). The first seal (3) is interference-fitted with the plunger body (6). The second main sealing ring (5) is disposed in the sealing groove of the plunger body (6).

2. The corrosion-resistant oil pump plunger seal structure as described in claim 1, characterized in that, The upper end face of the first seal (3) is in surface contact with the lower surface of the plunger end (4), and the lower end face of the first seal (3) is in surface contact with the upper surface of the pump body (1).

3. The corrosion-resistant oil pump plunger seal structure as described in claim 1, characterized in that, The upper end face of the first sealing element (3) is provided with a chamfer structure (31) on the side near the plunger body (6).

4. The corrosion-resistant oil pump plunger seal structure as described in claim 1, characterized in that, After installation, the upper surface of the gasket (2) contacts the lower surface of the plunger end (4), the lower surface of the gasket (2) contacts the upper surface of the pump body (1), and the thickness of the first seal (3) is greater than or equal to the thickness of the gasket (2).

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