Fuel filter capable of preventing backflow

Abstract

The utility model discloses a fuel filter capable of preventing backflow, which comprises a fuel filter main body, a fuel filter element main body is arranged on the surface of the inner side of the fuel filter main body, an oil inlet flow guide pipe fitting is arranged on the surface of the upper end of the fuel filter main body, and an oil outlet pipe is arranged on the outer side of the upper surface of the fuel filter main body. A supporting plate and an adapter convex pipe head are placed on the upper surface of the oil inlet flow guide pipe fitting, a conical cavity is formed in the inner side surface of the adapter convex pipe head, a conical sealing block is slidably connected to the inner side surface of the conical cavity of the adapter convex pipe head, an inserting rod is fixedly connected to the lower surface of the conical sealing block, and a spring is connected to the outer surface of the inserting rod in a sleeving mode. The adapter convex pipe head is installed outside the oil inlet flow guide pipe fitting, the one-way valve element assembly structure is directly arranged on the inner side of the adapter convex pipe head in a filling mode, installation and disassembly are convenient, the mechanism is simple, blocking type sealing is achieved after the conical sealing blocks are attached, the attaching area is large, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of fuel filters that prevent backflow, and more specifically, to a fuel filter that prevents backflow. Background Technology

[0002] A fuel filter is a component in the automotive industry that filters out particulate matter and impurities from fuel, preventing wear and damage to other parts of the vehicle's fuel system. It is an essential part of the fuel system and an indispensable component in the automotive industry.

[0003] Its fuel filter is connected in series between the fuel pump and the throttle body inlet. The function of the fuel filter is to remove solid impurities such as iron oxide and dust contained in the fuel, preventing clogging of the fuel system (especially the fuel injectors). It also reduces mechanical wear, ensures stable engine operation, and improves reliability. The fuel filter structure consists of an aluminum shell and a stainless steel bracket. High-efficiency filter paper discs, arranged in a chrysanthemum shape, are mounted on the bracket to increase the flow area. Electronic fuel injection filters are not interchangeable with carburetor filters. Because electronic fuel injection filters often withstand fuel pressures of 200-300 kPa, their pressure resistance is generally required to be above 500 kPa, while carburetor filters do not need to meet such high pressure requirements.

[0004] In existing fuel filters, the more impurities accumulate inside the filter element during long-term use, the easier it is for fuel to flow back during fuel intake. This utility model, authorized by CN220646088U, relates to the field of automotive parts technology, specifically a fuel filter to prevent backflow. It includes a lower housing and an upper housing. The top of the lower housing is threadedly connected to the upper housing, and the top of the upper housing has a fuel outlet. The bottom of the lower housing is threadedly connected to a sealing cap. Filter cotton is snapped into the interior of the lower housing. The internal movable installation includes cleaning scrapers located below the filter cotton, and a driven bevel gear is fixedly connected to the middle of the cleaning scrapers. The side of the lower housing is fixedly connected to an oil inlet guide pipe. This backflow-preventing fuel filter uses a one-way sealing ball and a compression spring installed on the oil inlet guide pipe. When oil is being introduced, the fuel pressure pushes the one-way sealing ball to move and allow oil to enter. When oil is stopped, the compression spring applies elastic force to the one-way sealing ball, causing the one-way sealing ball to fit against the sealing concave surface on the connecting cap, thus sealing the oil inlet position of the connecting cap.

[0005] The aforementioned patent uses a ball head seal for one-way sealing, which has a small contact area and poor sealing performance. In addition, the mechanism is an integrated structure, and its one-way oil inlet component is complex, costly, and inconvenient to install, disassemble, and maintain. Utility Model Content

[0006] To address the problems existing in the prior art, the purpose of this utility model is to provide a fuel filter that prevents backflow. By using an externally mounted adapter protrusion on the inlet guide pipe, the one-way valve core assembly structure is directly filled inside the adapter protrusion. It is easy to install and disassemble, and the mechanism is simple. It adopts a cone-shaped sealing block for blocking sealing after contact, and its contact area is large, which improves the sealing performance.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A fuel filter for preventing backflow includes a fuel filter body, a fuel filter element body disposed on the inner surface of the fuel filter body, an inlet guide pipe disposed on the upper surface of the fuel filter body, an outlet pipe disposed on the outer side of the upper surface of the filter body, a support plate and a connecting protrusion disposed on the upper surface of the inlet guide pipe, a conical cavity disposed on the inner surface of the connecting protrusion, and a conical sealing block slidably connected to the inner surface of the conical cavity of the connecting protrusion. The lower surface of the conical sealing block... A fixed connection is made to the surface of the connector, and a spring is sleeved on the outer surface of the connector. An oil inlet is opened on the surface of the support plate. A hexagonal concave sleeve is sleeved on the outer surface of the adapter protrusion. The hexagonal concave sleeve is threaded to the upper outer surface of the oil inlet guide pipe. By using an adapter protrusion installed on the outside of the oil inlet guide pipe, the one-way valve core assembly structure is directly filled into the inside of the adapter protrusion. It is easy to install and disassemble, and the mechanism is simple. It adopts a cone-shaped sealing block for blocking sealing after contact, and its contact area is large, which improves the sealing performance.

[0009] Furthermore, the inner surface of the hexagonal concave sleeve is provided with an internal thread, and the outer surface of the oil inlet guide pipe is provided with an external thread. The inner surface of the hexagonal concave sleeve is connected to the outer surface of the oil inlet guide pipe through a thread.

[0010] Furthermore, the oil inlet openings are distributed on both sides of the support plate, with one side having a concave structure and the other side having a curved structure.

[0011] Furthermore, the support plate has an insertion hole at its center, and the outer surface of the insertion rod is slidably connected to the inner surface of the insertion hole.

[0012] Furthermore, the outer surface of the support plate is covered with a rubber layer.

[0013] Furthermore, the outer surface of the conical sealing block is covered with a rubber layer.

[0014] Furthermore, the outer surface of the hexagonal concave sleeve is configured as a hexagonal truncated structure, and its outer surface is provided with hexagonal side cutouts.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] (1) By using an externally installed adapter protrusion of the oil inlet guide pipe, the one-way valve core assembly structure is directly filled into the inner side of the adapter protrusion. It is easy to install and disassemble, and the mechanism is simple. It adopts a cone-shaped sealing block for blocking sealing after bonding, and its bonding area is large, which improves the sealing performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is an enlarged view of point A in this utility model;

[0020] Figure 4 This is a schematic diagram of the adapter protrusion of this utility model;

[0021] Figure 5 This is a schematic diagram of the conical sealing block of this utility model;

[0022] Figure 6 This is a schematic diagram of the support plate of this utility model.

[0023] Explanation of the labels in the diagram:

[0024] 1 Fuel filter body, 2 Fuel filter element body, 3 Inlet guide pipe, 4 Outlet pipe, 5 Support plate, 6 Adapter protrusion, 7 Conical cavity, 8 Conical sealing block, 9 Insert rod, 10 Spring, 11 Inlet opening, 12 Through hole, 13 Hexagonal concave sleeve. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1: Please refer to Figure 1-6A fuel filter for preventing backflow includes a fuel filter body 1, with a fuel filter element body 2 disposed on the inner surface of the fuel filter body 1 (common materials for fuel filter elements include filter paper, nylon cloth, and polymer materials; these materials are chosen to filter impurities in gasoline and ensure fuel cleanliness. In addition, fuel filter elements can also be made of the following materials: paper filter elements: characterized by high filtration accuracy and low cost, suitable for ordinary passenger cars; non-woven fabric filter elements: characterized by strong oil resistance and good adsorption capacity, suitable for applications requiring high filtration efficiency; glass fiber filter elements: characterized by high filtration accuracy, high temperature resistance, and good chemical stability, suitable for high-performance vehicles or diesel engines). An oil inlet guide pipe 3 is disposed on the upper surface of the fuel filter body 1. An oil outlet pipe 4 is provided on the outer side of the surface. A support plate 5 and a transition convex head 6 are placed on the upper surface of the oil inlet guide pipe 3. A conical cavity 7 is provided on the inner surface of the transition convex head 6. A conical sealing block 8 is slidably connected to the inner surface of the conical cavity 7 of the transition convex head 6. An insert rod 9 is fixedly connected to the lower surface of the conical sealing block 8. A spring 10 is sleeved on the outer surface of the insert rod 9. An oil inlet opening 11 is opened on the surface of the support plate 5. A hexagonal concave sleeve 13 is sleeved on the outer surface of the transition convex head 6. The hexagonal concave sleeve 13 is threadedly connected to the upper outer surface of the oil inlet guide pipe 3. By using an transition convex head installed on the outside of the oil inlet guide pipe, the one-way valve core assembly structure is directly filled into the inner side of the transition convex head. It is easy to install and disassemble, and the mechanism is simple. It adopts a cone sealing block after contact and blocking seal, which has a large contact area and improves the sealing performance.

[0027] The inner surface of the hexagonal concave sleeve 13 is provided with internal threads, and the outer surface of the oil inlet guide pipe 3 is provided with external threads. The inner surface of the hexagonal concave sleeve 13 is connected to the outer surface of the oil inlet guide pipe 3 by threads, which facilitates twisting installation.

[0028] The oil inlet openings 11 are distributed on both sides of the support plate 5, with one side having a concave structure and the other side having a curved structure; this facilitates oil intake. When oil is being introduced, the fuel pushes open the conical sealing block 8 and can be discharged downwards, entering the oil inlet guide pipe 3 through the oil inlet opening 11, filtering the fuel inside the fuel filter body 1, and then exporting the filtered fuel through the oil outlet pipe 4.

[0029] In use, a support plate 5 and an adapter convex head 6 are placed on the upper surface of the oil inlet guide pipe 3. A conical cavity 7 is provided on the inner surface of the adapter convex head 6. A conical sealing block 8 is slidably connected to the inner surface of the conical cavity 7 of the adapter convex head 6. An insert rod 9 is fixedly connected to the lower surface of the conical sealing block 8. A spring 10 is sleeved on the outer surface of the insert rod 9. An oil inlet opening 11 is opened on the surface of the support plate 5. A hexagonal concave sleeve 13 is sleeved on the outer surface of the adapter convex head 6. The hexagonal concave sleeve 13 is threaded to the upper outer surface of the oil inlet guide pipe 3. It is easy to install. In use, when fuel enters, it can push open the conical sealing block 8. The conical sealing block 8 is squeezed by the spring 10. After being squeezed downward, oil enters. After oil enters, it rebounds. The conical sealing block 8 can fit tightly into the conical cavity 7 in the adapter convex head 6, which can fit and seal, improve the fitting area, and has strong sealing performance and prevents backflow.

[0030] The support plate 5 has an insertion hole 12 at the center of its surface, and the outer surface of the insertion rod 9 is slidably connected to the inner surface of the insertion hole 12; the insertion rod 9 can be slidably installed, making it easy to install and remove. The outer surface of the support plate 5 is covered with a rubber layer, and the outer surface of the conical sealing block 8 is covered with a rubber layer to increase the sealing performance.

[0031] The outer surface of the hexagonal recess 13 is set as a hexagonal truncated structure with hexagonal edge cutouts. When in use, the wrench can be used to easily twist and install and disassemble the hexagonal recess 13 by clamping it on the outer surface of the hexagonal truncated structure. It is easy to install and disassemble. After it is locked, it can be pressed to fix the adapter protrusion 6 and the support plate 5, and at the same time, it can be tightly installed and sealed.

[0032] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A fuel filter for preventing backflow, comprising a fuel filter body (1), characterized in that: The inner surface of the fuel filter body (1) is provided with a fuel filter element body (2), the upper surface of the fuel filter body (1) is provided with an oil inlet guide pipe (3), the outer side of the upper surface of the fuel filter body (1) is provided with an oil outlet pipe (4), the upper surface of the oil inlet guide pipe (3) is provided with a support plate (5) and a connecting protrusion (6), the inner surface of the connecting protrusion (6) is provided with a conical cavity (7), the inner surface of the conical cavity (7) of the connecting protrusion (6) is slidably connected with a conical sealing block (8), the lower surface of the conical sealing block (8) is fixedly connected with an insertion rod (9), the outer surface of the insertion rod (9) is sleeved with a spring (10), the surface of the support plate (5) is provided with an oil inlet opening (11), the outer surface of the connecting protrusion (6) is sleeved with a hexagonal concave sleeve (13), and the hexagonal concave sleeve (13) is threadedly connected to the upper outer surface of the oil inlet guide pipe (3).

2. The fuel filter for preventing backflow according to claim 1, characterized in that: The inner surface of the hexagonal concave sleeve (13) is provided with an internal thread, and the outer surface of the oil inlet guide pipe (3) is provided with an external thread. The inner surface of the hexagonal concave sleeve (13) is connected to the outer surface of the oil inlet guide pipe (3) by a thread.

3. A fuel filter for preventing backflow according to claim 1, characterized in that: The oil inlet opening (11) is distributed on both sides of the support plate (5), with one side being a concave structure and the other side being a curved structure.

4. A fuel filter for preventing backflow according to claim 1, characterized in that: The support plate (5) has an insertion hole (12) at the center of its surface, and the outer surface of the insertion rod (9) is slidably connected to the inner surface of the insertion hole (12).

5. A fuel filter for preventing backflow according to claim 1, characterized in that: The outer surface of the support plate (5) is covered with a rubber layer.

6. A fuel filter for preventing backflow according to claim 1, characterized in that: The outer surface of the conical sealing block (8) is covered with a rubber layer.

7. A fuel filter for preventing backflow according to claim 1, characterized in that: The outer surface of the hexagonal concave sleeve (13) is configured as a hexagonal truncated structure, and its outer surface is provided with hexagonal side cutouts.

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