Overhead fuel filter

Abstract

The utility model belongs to the technical field of filters, and relates to a top-mounted fuel filter, which comprises a shell, an oil inlet, an oil outlet and an exhaust oil return hole arranged at the bottom of an inner cavity of the shell; the exhaust pipe is in threaded connection with the exhaust oil return hole and extends upwards in the axial direction of the shell; the filter element assembly is installed in the shell, the exhaust pipe extends to an upper end cover of the filter element assembly along an inner hole of the filter element assembly, and the outer circumferential surface of the upper end of the exhaust pipe is in sealing fit with the inner wall of the inner hole of the upper end cover; the upper cover is in threaded connection with the shell, and the upper cover is in sealing fit with the shell; the filter element assembly further comprises an upper end cover protective cap and a felt ring, and a main exhaust hole is formed in the center of the upper end cover. The filter not only can effectively solve the gas collection phenomenon and enable an engine to operate more stably, but also can reduce the cost of replacing the filter element during maintenance as the exhaust pipe is designed and mounted on the shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters and relates to an upper-mounted fuel filter. Background Art

[0002] The main function of a fuel filter is to filter impurities in the fuel, ensure the cleanliness of the fuel, and enable the entire fuel injection system to operate stably and reliably. Currently, air accumulation easily occurs in filters on the market. If the gas cannot be discharged in time, it is very likely to cause poor fuel supply, thus affecting the operation of the vehicle. The existing conventional structure cannot effectively prevent the influence of the gas existing in the filter on the oil circuit. Summary of the Invention

[0003] Aiming at the above problems, the utility model provides an upper-mounted fuel filter. This filter can not only effectively solve the problem of air accumulation, making the engine run more stably, but also design and install the exhaust pipe on the housing, reducing the cost of replacing the filter element during maintenance.

[0004] According to the technical solution of the utility model: an upper-mounted fuel filter, characterized by comprising:

[0005] A housing, provided with an oil inlet and an oil outlet, and an exhaust oil return hole is arranged at the bottom of its inner cavity;

[0006] An exhaust pipe, threadedly connected to the exhaust oil return hole and extending upward along the axial direction of the housing;

[0007] A filter element assembly, installed in the housing, the exhaust pipe extends along the inner hole of the filter element assembly to the upper end cover of the filter element assembly, and the outer circumferential surface of the upper end of the exhaust pipe is in sealing cooperation with the inner wall of the inner hole of the upper end cover;

[0008] An upper cover, threadedly connected to the housing, and in sealing cooperation between the upper cover and the housing;

[0009] The filter element assembly further includes an upper end cover cap and a felt ring. A total exhaust hole is arranged at the center of the upper end cover. The upper and lower surfaces of the upper end cover are provided with coaxially arranged guide cylinders. The upper end cover cap presses and limits the felt ring in the upper guide cylinder. A dirty oil side exhaust hole is penetrated and arranged on the bottom plate of the upper end cover cap. A gas guiding structure is also constructed on the upper end cover. A clean oil side exhaust hole is penetrated and arranged on the side wall of the upper guide cylinder. One end of the clean oil side exhaust hole communicates with the felt ring, and the other end communicates with the cavity of the gas guiding structure. The cavity of the gas guiding structure communicates with the inner cavity of the filter element assembly.

[0010] As a further improvement of the utility model, the oil inlet is arranged on the side wall of the housing, and the oil outlet is arranged at the bottom of the housing.

[0011] As a further improvement of the utility model, the inlet end of the lower guide cylinder is constructed in a flared shape with a smaller upper part and a larger lower part to realize the guiding of the exhaust pipe.

[0012] As a further improvement of the present utility model, a fourth O-ring is disposed in a ring groove formed on the circumferential surface of the upper end of the exhaust pipe to achieve sealing with the inner wall of the lower guiding cylinder.

[0013] Sealing is achieved between the lower flange surface of the exhaust pipe and the exhaust oil return hole of the housing through a fifth O-ring.

[0014] As a further improvement of the present utility model, locking claws are formed on the top surface of the upper end cover to press against the supporting portion on the inner wall of the upper cover.

[0015] As a further improvement of the present utility model, the air guiding structure includes a vertical plate formed on the upper surface of the upper end cover, and the vertical plate is hermetically connected to the top end of the upper guiding cylinder through a horizontal plate.

[0016] As a further improvement of the present utility model, an external thread is formed on the connecting portion of the upper cover, a clamping groove is formed above the external thread, and a first O-ring is disposed in the clamping groove, and the first O-ring is hermetically fitted with the inner wall of the housing.

[0017] As a further improvement of the present utility model, sealing is achieved between the bottom of the filter element assembly and the housing through a second O-ring and a third O-ring, wherein the second O-ring achieves sealing between the filter element assembly and the inner wall of the housing, and the third O-ring achieves sealing between the inner ring at the lower end of the filter element assembly and the outer surface of the sleeve at the bottom of the inner cavity of the housing.

[0018] As a further improvement of the present utility model, the upper end cover cap includes a cap bottom plate, an upper flange and a connecting cylinder body. The dirty oil side exhaust hole is formed on the cap bottom plate, the cap bottom plate is integrally connected to the lower end of the connecting cylinder body, and the upper flange is integrally connected to the outer circumferential surface at the upper end of the connecting cylinder body.

[0019] The technical effect of the present utility model is as follows: The present utility model adopts a new exhaust structure, which can effectively solve the problem of air accumulation in the filter; the exhaust pipe is installed on the exhaust oil return hole through a thread, reducing the cost of replacing the filter element during maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural sectional view of the present utility model.

[0021] Figure 2 is a sectional view of the filter element structure of the present utility model.

[0022] Figure 3 is a fuel flow diagram.

[0023] Figure 4 is an exhaust flow diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0025] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] As Figures 1-4 shown, a fuel filter of the upper-mounted type of the present utility model includes a housing 4. The housing 4 is provided with an oil inlet 4-1 and an oil outlet 4-2, and an exhaust oil return hole 4-3 is provided at the bottom of its inner cavity; it can be understood that the oil inlet 4-1 is provided on the side wall of the housing 4, and the oil outlet 4-2 is provided at the bottom of the housing 4.

[0027] An exhaust pipe 8 is threadedly connected to the exhaust oil return hole 4-3 and extends upward along the axial direction of the housing 4;

[0028] A filter element assembly 3 is installed in the housing 4. The exhaust pipe 8 extends through the inner hole of the filter element assembly 3 to the upper end cover 3-3 of the filter element assembly 3, and the outer circumferential surface of the upper end of the exhaust pipe 8 is in sealing fit with the inner wall of the inner hole of the upper end cover 3-3;

[0029] An upper cover 1 is threadedly connected to the housing 4, and a sealing fit is provided between the upper cover 1 and the housing 4;

[0030] The filter element assembly 3 further includes an upper end cover cap 3-1 and a felt ring 3-2. A total exhaust hole 3-6 is provided at the center of the upper end cover 3-3. Coaxial guide cylinders are formed on the upper and lower surfaces of the upper end cover 3-3. The upper end cover cap 3-1 presses and limits the felt ring 3-2 in the upper guide cylinder. A dirty oil side exhaust hole 3-4 is provided through the bottom plate of the upper end cover cap 3-1. A gas guiding structure is also formed on the upper end cover 3-3. A clean oil side exhaust hole 3-5 is provided through the side wall of the upper guide cylinder. One end of the clean oil side exhaust hole 3-5 communicates with the felt ring 3-2, and the other end communicates with the cavity of the gas guiding structure. The cavity of the gas guiding structure communicates with the inner cavity of the filter element assembly 3.

[0031] The inlet end of the lower guide cylinder is configured in a flared shape with a smaller upper part and a larger lower part to realize the guiding of the exhaust pipe 8.

[0032] A fourth O-ring 7 is arranged in a ring groove formed on the outer circumferential surface of the upper end of the exhaust pipe 8 to realize the sealing with the inner wall of the lower guide cylinder.

[0033] The lower flange surface of the exhaust pipe 8 and the exhaust oil return hole of the housing 4 are sealed by a fifth O-ring 9.

[0034] The top surface of the upper end cover 3-3 is provided with locking claws 3-31 to press against the supporting part on the inner wall of the upper cover 1.

[0035] The air guiding structure includes a vertical plate formed on the upper surface of the upper end cover 3-3, and the vertical plate is hermetically connected to the top end of the upper guiding cylinder through a horizontal plate.

[0036] The connecting part of the upper cover 1 is provided with an external thread, and a clamping groove is formed above the external thread. The first O-ring 2 is fitted in the clamping groove, and the first O-ring 2 is hermetically fitted with the inner wall of the housing 4.

[0037] The bottom of the filter element assembly 3 is sealed with the housing 4 through the second O-ring 5 and the third O-ring 6. Among them, the second O-ring 5 seals the filter element assembly 3 and the inner wall of the housing 4, and the third O-ring 6 seals the outer surface of the inner ring at the lower end of the filter element assembly 3 and the bottom sleeve in the inner cavity of the housing 4.

[0038] The upper end cover cap 3-1 includes a cap bottom plate, an upper flange and a connecting cylinder. The dirty oil side exhaust hole 3-4 is formed on the cap bottom plate. The cap bottom plate is integrally connected to the lower end of the connecting cylinder, and the upper flange is integrally connected to the outer circumferential surface of the upper end of the connecting cylinder.

[0039] As Figures 1-4 shown, the unfiltered fuel enters through the fuel inlet of the housing 4, and the clean fuel filtered by the filter element assembly 3 flows out from the fuel outlet of the housing 4 and is used by the entire fuel supply system.

[0040] The air on the dirty oil side passes through the dirty oil side exhaust hole 3-4, and the air on the clean oil side passes through the clean oil side exhaust hole 3-5, and then flows into the oil return passage through the total exhaust hole 3-6, thereby solving the air accumulation problem and ensuring the full use of the filter element assembly 3.

[0041] In the utility model, the exhaust pipe 8 is installed on the exhaust oil return hole 4-3 by thread, and the overall sealing performance is ensured by the fifth O-ring 9. It does not need to be replaced during the maintenance of the filter, reducing the cost of replacing the filter element during maintenance.

[0042] The utility model adopts a new exhaust structure, which is composed of an upper end cover cap 3-1, a felt ring 3-2 and an upper end cover 3-3. The air on the dirty oil side and the clean oil side is discharged through this exhaust structure and flows into the oil return passage through the exhaust pipe, which can effectively solve the air accumulation problem of the filter. A felt ring 3-2 is installed between the three exhaust holes. It can prevent the dirty side particles from flowing into the clean side oil passage through the clean side exhaust hole 3-5 and ensure the overall filtration efficiency.

[0043] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A top-mounted fuel filter, characterized in that: include: The housing (4) is provided with an oil inlet (4-1) and an oil outlet (4-2), and an exhaust oil return hole (4-3) is provided at the bottom of the inner cavity thereof; An exhaust pipe (8) threadedly connected to the exhaust oil return hole (4-3) and extending upward along the axial direction of the housing (4); The filter element assembly (3) is installed in the housing (4), the exhaust pipe (8) extends along the inner hole of the filter element assembly (3) to the upper end cover (3-3) of the filter element assembly (3), and the outer circumferential surface of the upper end of the exhaust pipe (8) is sealed with the inner wall of the inner hole of the upper end cover (3-3); The upper cover (1) is threadably connected to the housing (4), and the upper cover (1) and the housing (4) are sealed together; The filter element assembly (3) further comprises an upper end cover protective cap (3-1) and a felt ring (3-2); a main exhaust hole (3-6) is arranged at the center of the upper end cover (3-3); the upper and lower surfaces of the upper end cover (3-3) are provided with coaxially arranged guide cylinders; the upper end cover protective cap (3-1) presses the felt ring (3-2) into the upper guide cylinder for limiting its position; a dirty oil side exhaust hole (3-4) is provided through the bottom plate of the upper end cover protective cap (3-1); an air guide structure is also provided on the upper end cover (3-3); a clean oil side exhaust hole (3-5) is provided through the side wall of the upper guide cylinder; one end of the clean oil side exhaust hole (3-5) is connected to the felt ring (3-2) and the other end is connected to the cavity of the air guide structure; the cavity of the air guide structure is connected to the inner cavity of the filter element assembly (3).

2. The top-mounted fuel filter according to claim 1, characterized in that: The oil inlet (4-1) is arranged on the side wall of the housing (4), and the oil outlet (4-2) is arranged on the bottom of the housing (4).

3. The top-mounted fuel filter according to claim 1, characterized in that: The inlet end of the lower guide cylinder is structured in a trumpet-shaped shape with a small upper portion and a large lower portion, so as to guide the exhaust pipe (8).

4. The top-mounted fuel filter according to claim 1, characterized in that: A fourth O-ring (7) is provided in the annular groove on the circumferential surface of the upper end of the exhaust pipe (8) to achieve sealing with the inner wall of the lower guide cylinder; A fifth O-ring (9) is used to seal the lower flange surface of the exhaust pipe (8) and the exhaust oil return hole of the housing (4).

5. The top-mounted fuel filter according to claim 1, characterized in that: The top surface of the upper end cover (3-3) is configured with a locking claw (3-31) for pressing against a supporting portion of the inner wall of the upper cover (1).

6. The top-mounted fuel filter according to claim 1, characterized in that: The air guide structure comprises a vertical plate constructed on the upper surface of the upper end cover (3-3), and the vertical plate is sealed and connected to the top end of the upper guide cylinder via a horizontal plate.

7. The top-mounted fuel filter according to claim 1, characterized in that: The connection portion of the upper cover (1) is configured with an external thread, and a slot is configured above the external thread. The first O-ring (2) is arranged in the slot, and the first O-ring (2) is sealingly matched with the inner wall of the housing (4).

8. The top-mounted fuel filter according to claim 1, characterized in that: The bottom of the filter element assembly (3) is sealed between the second O-ring (5), the third O-ring (6) and the housing (4), wherein the second O-ring (5) seals the filter element assembly (3) and the inner wall of the housing (4), and the third O-ring (6) seals the inner ring at the lower end of the filter element assembly (3) and the outer surface of the sleeve at the bottom of the inner cavity of the housing (4).

9. The top-mounted fuel filter according to claim 1, characterized in that: The upper end cover protective cap (3-1) comprises a protective cap bottom plate, an upper flange and a connecting cylinder, the dirty oil side exhaust hole (3-4) is constructed on the protective cap bottom plate, the protective cap bottom plate is integrally connected to the lower end of the connecting cylinder, and the upper flange is integrally connected to the outer circular surface of the upper end of the connecting cylinder.

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