Fuel and lubricating oil filter

Abstract

The utility model discloses a fuel and lubricating oil filter which mainly comprises a spring, a bypass valve seat, a valve shell, a self-sealing valve seat, a rubber part, a filter element assembly and a shell assembly which are coaxially assembled, sealing is achieved between the valve shell and the self-sealing valve seat through spring driving, sealing is achieved between the bypass valve seat and the valve assembly through spring driving, and axial pressing is achieved among the filter element assembly, the valve shell and the bypass valve seat through springs. According to the utility model, the structure of the conventional fuel and lubricating oil filter is simplified, the dead weight of the filter is reduced, the manufacturing cost and difficulty of the filter are reduced, and the economical efficiency of the filter is improved.

Description

Technical Field

[0001] The utility model belongs to the field of filter structure design, in particular to a spring structure in a fuel and lubricating oil filter with bypass, self-sealing and anti-movement functions. Background Art

[0002] During the operation of the aviation fuel system and lubricating oil system, the system working oil inevitably contains various impurities, which will cause damage to the system. In order to ensure the normal operation of the system, reduce the wear of the components in the system, and extend the service life, a filter is set in the system accessories to filter the impurities in the working oil. According to the use function of the filter, the filter is provided with a bypass valve and a self-sealing valve. The bypass valve is used to ensure the normal oil supply of the system when the filter element is blocked; the self-sealing valve is used to automatically close the inlet channel of the filter when cleaning and replacing the filter element to prevent external impurities from entering and prevent the system oil from leaking. At present, the bypass valve and the self-sealing valve often realize their functions through the expansion and contraction of different spring structures, which increases the complexity of the structural design, increases the weight of the filter, and increases the manufacturing cost and difficulty. Summary of the invention

[0003] In view of the problems existing in the background technology, the utility model aims to provide a fuel and lubricating oil filter, which realizes the functions of a bypass valve, a self-sealing valve, and a stable filter element assembly through a spring, simplifies the structure of the fuel and lubricating oil filter, reduces the weight of the fuel and lubricating oil filter, and reduces the manufacturing cost and difficulty.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] Fuel and oil filter, including:

[0006] A shell assembly, wherein a fuel oil flow cavity is formed inside the shell assembly, wherein a fuel oil outlet is formed on an end surface along the axial direction of the shell assembly, and a fuel oil inlet is formed near the fuel oil outlet and on the circumferential surface of the shell assembly;

[0007] A filter element assembly, wherein the filter element assembly is installed in the fuel oil flow cavity of the housing assembly and is coaxial with the housing assembly. The filter element assembly is a hollow rotating body. A filter outlet is opened on the axial end face of the filter element assembly close to the fuel oil outlet on the housing assembly. The filter screen is located on the rotating surface of the filter element assembly. The fuel oil enters the hollow cavity of the filter element assembly through the filter screen from the outside of the filter element assembly and then flows out from the filter outlet and flows to the fuel oil outlet.

[0008] A valve housing, wherein the valve housing is a rotating body with a cavity, and the inlet end of the cavity is connected to the filter outlet, and the outlet end is connected to the fuel and lubricating oil outlet. The valve housing is installed in the fuel and lubricating oil flow cavity and is coaxial with the housing assembly. A through hole is also opened on the valve housing, one end of the through hole is connected to the fuel and lubricating oil flow cavity, and the other end is connected to the cavity of the valve housing. A circle of first annular protrusions is formed on the inner wall of the cavity of the valve housing, and a circle of second annular protrusions is also formed on the outer surface of the valve housing;

[0009] A bypass valve seat and a spring, wherein the bypass valve seat is slidably connected in the cavity of the valve housing through the spring, and the bypass valve seat is coaxial with the valve housing, and the axial end surface of the bypass valve seat includes a tapered surface, and when the tapered surface fits with the annular protrusion in the cavity of the valve housing, a sealing surface is formed between the fuel flow cavity and the valve housing cavity to isolate the two;

[0010] A self-sealing valve seat, which is an annular member and is mounted on the inner wall of the fuel and lubricating oil flow chamber. The self-sealing valve seat is coaxial with the housing assembly, and the axial distance from the self-sealing valve seat to the fuel and lubricating oil outlet is greater than the axial distance from the second annular protrusion to the fuel and lubricating oil outlet;

[0011] The rubber piece is an annular piece and is installed on the axial end surface of the self-sealing valve seat close to the fuel and lubricating oil outlet. When the rubber piece fits with the second annular protrusion, a sealing surface is formed in the fuel and lubricating oil flow cavity.

[0012] Furthermore, the fuel and lubricating oil filter also includes a retaining ring and a third annular protrusion, wherein the retaining ring is installed in a groove on the inner wall of the fuel and lubricating oil flow chamber, the third annular protrusion is located on the inner wall of the fuel and lubricating oil flow chamber, and the self-sealing valve seat and the rubber member are installed between the retaining ring and the third annular protrusion.

[0013] Furthermore, the housing assembly includes an upper housing and a lower housing, and the upper housing and the lower housing are connected via threads.

[0014] Furthermore, the spring is a cylindrical spring.

[0015] Furthermore, one end of the valve housing is sealedly connected to the filter element assembly, and the other end is inserted into the inner wall of the fuel and lubricating oil outlet.

[0016] Furthermore, the fuel oil outlet is a stepped through hole on the end surface of the housing assembly.

[0017] Compared with the prior art, the utility model designs a spring in the shell assembly near the fuel and lubricating oil outlet. The spring cooperates with the bypass valve seat, the self-sealing valve seat and the valve shell to realize the three functions of the bypass valve, the self-sealing valve and the stable filter element assembly, thereby simplifying the structure of the fuel and lubricating oil filter, reducing the weight of the fuel and lubricating oil filter, improving the economy of the product, and reducing the manufacturing cost and difficulty of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the filter state when the spring in the utility model plays the function of stabilizing the filter element assembly;

[0019] Figure 2 This is a schematic diagram of the filter state when the spring in the utility model functions as a bypass valve;

[0020] Figure 3 It is a schematic diagram of the filter state when the spring in the utility model functions as a self-sealing valve;

[0021] In the figure: 1-spring, 2-bypass valve seat, 3-valve housing, 4-self-sealing valve seat, 5-rubber part, 6-retaining ring, 7-filter element assembly, 8-housing assembly. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0023] like Figure 1 to Figure 3 As shown, the fuel and lubricating oil filter designed in this embodiment is mainly composed of a spring 1, a bypass valve seat 2, a valve housing 3, a self-sealing valve seat 4, a rubber part 5, a retaining ring 6, a filter element assembly 7 and a housing assembly 8, and the spring 1, the bypass valve seat 2, the valve housing 3, the self-sealing valve seat 4, the rubber part 5, the retaining ring 6, the filter element assembly 7 and the housing assembly 8 are all coaxially assembled.

[0024] like Figure 1 As shown, there is a gap assembly between the bypass valve seat 2 and the valve housing 3, and between the valve housing 3 and the housing assembly 8. Through the expansion and contraction of the spring 1, the bypass valve seat 2 can slide freely in the valve housing 3, and the valve housing 3 can slide freely in the housing assembly 8 (the sliding position is the fuel oil outlet of the housing assembly 8, that is, the stepped through hole at one axial end of the housing assembly 8). The housing assembly 8 is divided into an upper housing and a lower housing, which are threadedly connected. The outer surface of the valve housing 3 has a circle of second annular protrusions, which is used to press the rubber member 5 to form a sealing surface. The end face of the bypass valve seat 2 has a circle of conical surface, which cooperates with a circle of first annular protrusions on the inner wall of the valve housing 3 to form a sealing surface.

[0025] The axial end surface of the self-sealing valve seat 4 is provided with a vulcanized rubber member 5 as a sealing member, and the self-sealing valve seat 4 is fixed to the inner wall of the housing assembly 8 through a retaining ring 6 and a third annular protrusion on the inner wall of the housing assembly 8. The rubber member 5 is fixed to the surface of the self-sealing valve seat 4 by vulcanization, and when the spring 1 acts as a self-sealing valve, the valve housing 3 presses the rubber member 5 to improve the sealing performance.

[0026] The filter element assembly 7 in the fuel oil filter is composed of a skeleton ( Figure 1 The filter element assembly 7 is composed of a structure with multiple circular holes on the middle surface and a filter net covered on the outer surface of the skeleton. When the filter element assembly 7 works normally, the spring 1 drives the valve housing 3 to slide a very small distance in the direction of the filter element assembly 7, thereby eliminating the installation gap between the filter element assembly 7 and the valve housing 3 and the housing assembly 8. Relying on the compression effect of the axial force, the shaking of the filter element assembly 7 during operation is reduced, thereby stabilizing the filter element assembly 7.

[0027] When the filter element assembly 7 in the fuel and lubricating oil filter is clogged, the pressure difference between the fuel and lubricating oil inlet and the fuel and lubricating oil outlet of the fuel and lubricating oil filter increases, the spring 1 is subjected to force, and the compression amount increases, and the bypass valve seat 2 slides toward the fuel and lubricating oil outlet of the fuel and lubricating oil filter. A through hole is provided on the side of the valve housing 3 (arranged around the circumferential surface of the valve housing 3), and the working oil flows to the fuel and lubricating oil outlet through the through hole, playing the role of a bypass valve.

[0028] When the fuel and lubricating oil filter is replaced or the filter element assembly 7 is cleaned, the spring 1 is stretched, driving the bypass valve seat 2 and the valve housing 3 to slide toward the self-sealing valve seat 4. The valve housing 3 (the second annular protrusion) presses the vulcanized rubber part 5 on the self-sealing valve seat 4, and the flow path of the working oil to the fuel and lubricating oil outlet is closed, which plays the role of a self-sealing valve.

[0029] like Figure 1 As shown in the figure, the black solid arrows represent the flow direction and path of the working oil. When the fuel filter works normally, the working oil flows in from the fuel inlet on the housing assembly 8, and flows out from the fuel outlet after being filtered by the filter element assembly 7. At this time, the spring 1 drives the valve housing 3 to slide a very small distance in the direction of the filter element assembly 7, eliminating the installation gap (i.e., axial gap) between the filter element assembly 7 and the valve housing 3 and the housing assembly 8, reducing the shaking of the filter element assembly 7 during operation, and the spring 1 plays the role of stabilizing the filter element assembly 7.

[0030] like Figure 2As shown in the figure, the black solid arrows represent the flow direction and path of the working oil. When the filter element assembly 7 of the fuel and lubricating oil filter is blocked, the pressure difference between the fuel and lubricating oil inlet and the fuel and lubricating oil outlet of the fuel and lubricating oil filter increases, the spring 1 is compressed, and the bypass valve seat 2 slides toward the fuel and lubricating oil outlet. A through hole is set on the side of the valve housing 3, and the working oil flows in from the fuel and lubricating oil inlet on the housing assembly 8 and flows out from the fuel and lubricating oil outlet through the through hole on the side of the valve housing 3. The spring 1 plays the role of a bypass valve.

[0031] like Figure 3 As shown in the figure, the black solid arrows represent the flow direction and path of the working oil. When the fuel oil filter is replaced or the filter element assembly 7 is cleaned, the filter element assembly 7 is taken out from the housing assembly 8, the spring 1 is stretched, and the bypass valve seat 2 and the valve housing 3 slide toward the self-sealing valve seat 4, and the valve housing 3 presses the vulcanized rubber part 5 on the self-sealing valve seat 4. The working oil is stabilized in the closed cavity formed by the housing assembly 8, the valve housing 3, and the bypass valve seat 2, and the flow channel to the fuel oil outlet is closed, and the spring 1 plays the role of a self-sealing valve.

[0032] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fuel oil filter, characterized in that: include: A shell component (8), wherein a fuel oil flow chamber is formed inside the shell component (8), wherein a fuel oil outlet is formed on an end surface along the axial direction of the shell component (8), and a fuel oil inlet is formed near the fuel oil outlet and on the circumferential surface of the shell component (8); A filter element assembly (7), wherein the filter element assembly (7) is installed in the fuel oil flow cavity of the housing assembly (8) and is coaxial with the housing assembly (8); the filter element assembly (7) is a hollow rotating body; a filter outlet is provided on the axial end face of the filter element assembly (7) close to the fuel oil outlet on the housing assembly (8); the filter screen is located on the rotating surface of the filter element assembly (7); the fuel oil enters the hollow cavity of the filter element assembly (7) through the filter screen from the outside of the filter element assembly (7) and then flows out from the filter outlet and flows toward the fuel oil outlet; A valve housing (3), wherein the valve housing (3) is a rotating body with a cavity, wherein the inlet end of the cavity is connected to the filter outlet, and the outlet end is connected to the fuel oil outlet. The valve housing (3) is installed in the fuel oil flow cavity and is coaxial with the housing assembly (8). A through hole is also provided on the valve housing (3), one end of the through hole is connected to the fuel oil flow cavity, and the other end is connected to the cavity of the valve housing (3). A circle of first annular protrusions is provided on the inner wall of the cavity of the valve housing (3), and a circle of second annular protrusions is also provided on the outer surface of the valve housing (3); A bypass valve seat (2) and a spring (1), wherein the bypass valve seat (2) is slidably connected in the cavity of the valve housing (3) via the spring (1), and the bypass valve seat (2) and the valve housing (3) are coaxial, and the axial end surface of the bypass valve seat (2) includes a conical surface, and when the conical surface is in contact with the annular protrusion in the cavity of the valve housing (3), a sealing surface is formed between the fuel oil flow cavity and the cavity of the valve housing (3) to isolate the two; A self-sealing valve seat (4), the self-sealing valve seat (4) being an annular member and being mounted on the inner wall of the fuel oil flow chamber, the self-sealing valve seat (4) being coaxial with the housing assembly (8), and the axial distance from the self-sealing valve seat (4) to the fuel oil outlet being greater than the axial distance from the second annular protrusion to the fuel oil outlet; The rubber member (5) is an annular member and is mounted on the axial end surface of the self-sealing valve seat (4) close to the fuel oil outlet. When the rubber member (5) is in contact with the second annular protrusion, a sealing surface is formed in the fuel oil flow chamber.

2. The fuel and lubricating oil filter according to claim 1, characterized in that: It also includes a retaining ring (6) and a third annular protrusion, wherein the retaining ring (6) is installed in a groove on the inner wall of the fuel and lubricating oil flow chamber, and the third annular protrusion is located on the inner wall of the fuel and lubricating oil flow chamber, and the self-sealing valve seat (4) and the rubber member (5) are installed between the retaining ring (6) and the third annular protrusion.

3. The fuel and lubricating oil filter according to claim 1, characterized in that: The housing assembly (8) comprises an upper housing and a lower housing, and the upper housing and the lower housing are connected via threads.

4. The fuel and lubricating oil filter according to claim 1, characterized in that: The spring (1) is a cylindrical spring.

5. The fuel and lubricating oil filter according to claim 1, characterized in that: One end of the valve housing (3) is sealedly connected to the filter element assembly (7), and the other end is inserted into the inner wall of the fuel oil outlet.

6. The fuel and lubricating oil filter according to claim 1, characterized in that: The fuel oil outlet is a stepped through hole on the end surface of the housing component (8).

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