Isolated closed fuel filter

Abstract

According to the technical scheme, the isolated closed type fuel filter comprises a protective cylinder, an inlet pipe is communicated with the center of the top of the protective cylinder, an outlet pipe is communicated with the center of the bottom of the protective cylinder, the outlet pipe is communicated with a filter cylinder fixed to the inner bottom of the protective cylinder, and filter paper is connected to the outer portion of the filter cylinder in an inserted mode. A filter plate is arranged at the upper part in the protective cylinder, the filter plate comprises a plane cone plate with the top surface diameter larger than the bottom surface diameter and a cylinder fixed at the top of the plane cone plate, filter holes of the filter plate are formed in the side surface of the plane cone plate, and the top surface of the filter plate is communicated with the bottom surface to be closed. Sealing is achieved through threaded connection between the first protective cylinder and the second protective cylinder so that the filter can be separated from the outside, it is avoided that due to excessive external impurities, the service life of filter paper is shortened, the service life of the filter is prolonged, meanwhile, preliminary filtering is conducted through the filter plate, impurities on the surface of the filter paper are further reduced, and the service life of the filter is prolonged. The service life of the filter paper is further prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel filters, in particular to an isolated and enclosed fuel filter. Background Technique

[0002] Fuel filters are divided into three categories: diesel filters, gasoline filters, and natural gas filters. The function of a fuel filter is to prevent particulate matter, water, and impurities in the fuel, ensuring that precision components in the fuel system are protected from wear and other damages. The fuel filter is connected in series on the pipeline between the fuel pump and the inlet of the throttle valve body, removing solid impurities such as iron oxide and dust contained in the fuel, preventing blockage of the fuel system (especially the fuel injector), reducing mechanical wear, ensuring stable operation of the engine, and improving reliability.

[0003] Chinese Patent with the publication number CN220909874U discloses a fuel filter. Through the sliding connection of the first connecting rod and the second connecting rod, and an adjustment and positioning mechanism is provided between the first connecting rod and the second connecting rod, so that through the adjustment and positioning mechanism, the movement of the second support plate and the second connecting rod can be adjusted and positioned, and the distance between the base and the upper cover can be adjusted, thereby facilitating the disassembly, installation, and fixation of the filter element. However, due to its exposed state, it will cause excessive impurities and increase the working load of the filter element. Summary of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the present utility model is to provide an isolated and enclosed fuel filter.

[0005] In order to achieve the above purpose, the technical solution of the present utility model is as follows:

[0006] An isolated and enclosed fuel filter includes a protection cylinder. The center of the top of the protection cylinder is connected to an inlet pipe, and the center of the bottom of the protection cylinder is connected to an outlet pipe. The outlet pipe is connected to a filter cylinder fixed at the bottom inside the protection cylinder. A filter paper is inserted outside the filter cylinder. An upper part inside the protection cylinder is provided with a filter plate. The filter plate includes a flat conical plate with a top surface diameter larger than the bottom surface diameter and a cylinder fixed at the top of the flat conical plate. The filter holes of the filter plate are opened on the side surface of the flat conical plate, and the top surface of the filter plate is open and the bottom surface is closed.

[0007] Preferably, the diameter of the bottom surface of the filter plate is not less than the outer diameter of the filter paper.

[0008] Preferably, the bottom surface of the filter plate abuts against the filter cylinder.

[0009] Preferably, the protective cylinder includes a first protective cylinder and a second protective cylinder. An outer stepped platform is provided at the upper part of the first protective cylinder, and an external thread is provided on the stepped platform at the upper part of the first protective cylinder. An inner stepped shape is provided at the lower part of the second protective cylinder, and an internal thread is provided on the stepped platform at the lower part of the second protective cylinder. The first protective cylinder and the second protective cylinder are thread-sealed and connected through the external thread and the internal thread.

[0010] Preferably, the height of the stepped platform at the lower part of the second protective cylinder is greater than the height of the stepped platform at the upper part of the first protective cylinder.

[0011] Preferably, symmetrically limited slots are provided on both sides between the internal thread and the stepped platform inside the second protective cylinder. Through holes with a cross-sectional area smaller than that of the limited slots are communicated and opened on the opposite sides of the two limited slots. The through holes penetrate the second protective cylinder, and a rubber pad is sealed outside the through holes. Fixed cylinders are symmetrically provided on both sides of the upper cylinder of the filter plate. An expansion rod is slidably arranged inside the fixed cylinder. A limiting block adapted to the limited slot is provided at the end of the expansion rod, and a return spring wound around the expansion rod is provided between the limiting block and the end of the fixed cylinder.

[0012] Preferably, the inner diameter of the upper cylinder of the filter plate is not less than the inner diameter of the upper part inside the second protective cylinder.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model realizes sealing through the threaded connection between the first protective cylinder and the second protective cylinder, thereby isolating the filter from the outside, avoiding the reduction of the service life of the filter paper caused by excessive external impurities, improving the service life of the filter, and at the same time, performing preliminary filtration through the filter plate to further reduce the impurities on the surface of the filter paper, thereby further increasing the service life of the filter paper;

[0015] 2. The present utility model realizes the convenient loading and unloading between the filter plate and the second protective cylinder through the fixed cylinder, the expansion rod, the return spring, the limiting block, the limited slot, the through hole and the rubber pad, which is beneficial to the later maintenance and replacement, and increases the practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present utility model will be described with reference to the accompanying drawings. It should be understood that the drawings are only for the purpose of illustration and are not intended to limit the scope of protection of the present utility model. In the drawings, the same reference numerals are used to refer to the same components.

[0017] Wherein:

[0018] Figure 1 is the overall structural schematic diagram of the present utility model;

[0019] Figure 2 is the structural schematic diagram of the second protective cylinder of the present utility model Figure 1 ;

[0020] Figure 3 It is a schematic structural diagram of the filter plate of the present utility model;

[0021] Figure 4 It is a schematic structure of the second protection cylinder of the present utility model Figure 2 ;

[0022] Figure 5 It is a schematic structural diagram of the first protection cylinder of the present utility model;

[0023] Figure 6 It is a schematic structural diagram of the filter cartridge of the present utility model.

[0024] The markings in the figure illustrate: 1. The first protection cylinder; 2. The second protection cylinder; 3. The inlet pipe; 4. The outlet pipe;

[0025] 5. The filter plate; 6. The fixed cylinder; 7. The telescopic rod; 8. The return spring; 9. The limit block;

[0026] 10. The limit groove; 11. The through hole; 12. The rubber pad; 13. The filter cartridge; 14. The filter paper. Specific embodiments

[0027] It is easy to understand that according to the technical solution of the present utility model, without changing the essence of the present utility model, those of ordinary skill in the art can propose various structural ways and implementation ways that can be mutually replaced. Therefore, the following specific embodiments and the accompanying drawings are only illustrative descriptions of the technical solution of the present utility model, and should not be regarded as all of the present utility model or as a limitation or restriction on the technical solution of the present utility model.

[0028] As Figure 1 shown, as a kind of isolated and enclosed fuel filter of the present utility model, it includes a protection cylinder, and the protection cylinder includes the first protection cylinder 1 and the second protection cylinder 2. As Figure 5 shown, an outer stepped platform is provided on the upper part of the first protection cylinder 1, and an external thread is provided on the stepped platform on the upper part of the first protection cylinder 1. As Figure 2 shown, an inner stepped shape is provided on the lower part of the second protection cylinder 2, and an internal thread is provided on the stepped platform on the lower part of the second protection cylinder 2. The first protection cylinder 1 and the second protection cylinder 2 are thread-sealed and connected through the external thread and the internal thread. A feed pipe 3 is connected to the center of the top of the second protection cylinder 2, and a discharge pipe 4 is connected to the center of the bottom of the first protection cylinder 1, and the discharge pipe 4 is communicated with the filter cartridge 13 fixed to the inner bottom of the first protection cylinder 1. As Figure 6 shown, a filter paper 14 is inserted outside the filter cartridge 13. The filter is isolated from the outside by the threaded connection between the first protection cylinder 1 and the second protection cylinder 2, avoiding the reduction of the service life of the filter paper 14 caused by excessive external impurities, thereby improving the service life of the filter.

[0029] The height of the lower stepped platform of the second protective cylinder 2 is greater than the height of the upper stepped platform of the first protective cylinder 1. A filter plate 5 is arranged inside the second protective cylinder 2. As Figure 3 shown, the filter plate 5 includes a flat conical plate with a top surface diameter larger than the bottom surface diameter and a cylinder fixed to the top of the flat conical plate. The filter holes of the filter plate 5 are opened on the side surface of the flat conical plate, and the top surface of the filter plate 5 is open and the bottom surface is closed. Fixed cylinders 6 are symmetrically arranged on both sides of the cylinder on the filter plate 5. An expansion rod 7 is slidably arranged inside the fixed cylinder 6. A limit block 9 adapted to the limit groove 10 is arranged at the end of the expansion rod 7. A return spring 8 wound around the expansion rod 7 is arranged between the limit block 9 and the end of the fixed cylinder 6. As Figure 4 shown, limit grooves 10 are symmetrically opened on both sides between the internal thread and the stepped platform inside the second protective cylinder 2. Through holes 11 with a cross-sectional area smaller than that of the limit groove 10 are communicated and opened on the opposite sides of the two limit grooves 10. The through holes 11 penetrate through the second protective cylinder 2, and a rubber pad 12 is sealed outside the through holes 11. By pressing the limit block 9, the filter plate 5 is placed into the second protective cylinder 2 until the limit block 9 corresponds to the position of the limit groove 10. The limit block 9 is inserted into the limit groove 10 by the resilience of the return spring 8, thereby realizing the connection between the filter plate 5 and the second protective cylinder 2. By pressing the rubber pad 12 until the limit block 9 disengages from the limit groove 10, the disassembly between the filter plate 5 and the second protective cylinder 2 is realized. The convenient loading and unloading between the filter plate 5 and the second protective cylinder 2 is simply and efficiently realized, which is beneficial to later maintenance and replacement, and increases the practical value.

[0030] The diameter of the bottom surface of the filter plate 5 is not less than the outer diameter of the filter paper 14, ensuring that the liquid filtered by the filter plate 5 can directly fall into the bottom of the first protective cylinder 1, avoiding directly falling on the upper surface of the filter paper 14 to generate impurities and causing blockage of the filter paper 14. At the same time, preliminary filtration is carried out through the filter plate 5 to further reduce the impurities on the surface of the filter paper 14, thereby further increasing the service life of the filter paper 14. The bottom surface of the filter plate 5 abuts against the filter cylinder 13, and the filter cylinder 13 plays a role in supporting the filter plate 5, increasing the stability of the filter. The top surface of the cylinder on the filter plate 5 abuts against the stepped platform inside the second protective cylinder 2, and the inner diameter of the cylinder on the filter plate 5 is not less than the inner diameter of the upper part inside the second protective cylinder 2, ensuring that the liquid entering through the inlet pipe 3 will directly fall on the filter hole area of the filter plate 5.

[0031] The technical scope of the present utility model is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present utility model, and these deformations and modifications should all fall within the protection scope of the present utility model.

Claims

1. An isolated and enclosed fuel filter, characterized in that: It includes a protective cylinder. A feed pipe (3) is connected to the center of the top of the protective cylinder, and a discharge pipe (4) is connected to the center of the bottom of the protective cylinder. The discharge pipe (4) is connected to a filter cartridge (13) fixed to the inner bottom of the protective cylinder. A filter paper (14) is inserted outside the filter cartridge (13). A filter plate (5) is arranged in the upper part of the protective cylinder. The filter plate (5) includes a flat conical plate with a top surface diameter larger than the bottom surface diameter and a cylinder fixed to the top of the flat conical plate. The filter holes of the filter plate (5) are opened on the side surface of the flat conical plate, and the top surface of the filter plate (5) is open and the bottom surface is closed.

2. The isolated and enclosed fuel filter according to claim 1, wherein: The diameter of the bottom surface of the filter plate (5) is not less than the outer diameter of the filter paper (14).

3. The isolated and enclosed fuel filter according to claim 2, characterized in that: The bottom surface of the filter plate (5) abuts against the filter cartridge (13).

4. The isolated and enclosed fuel filter according to claim 1, wherein: The protective cylinder includes a first protective cylinder (1) and a second protective cylinder (2). An outer stepped platform is arranged on the upper part of the first protective cylinder (1), and an external thread is arranged on the upper stepped platform of the first protective cylinder (1). An inner stepped shape is arranged on the lower part of the second protective cylinder (2), and an internal thread is arranged on the lower stepped platform of the second protective cylinder (2). The first protective cylinder (1) and the second protective cylinder (2) are thread-sealed and connected through the external thread and the internal thread.

5. The isolated and enclosed fuel filter according to claim 4, wherein: The height of the lower stepped platform of the second protective cylinder (2) is greater than the height of the upper stepped platform of the first protective cylinder (1).

6. The isolated and enclosed fuel filter according to claim 5, wherein: Limiting grooves (10) are symmetrically opened on both sides between the internal thread and the stepped platform in the second protective cylinder (2). Through holes (11) with a cross-sectional area smaller than that of the limiting grooves (10) are communicated and opened on the opposite sides of the two limiting grooves (10). The through holes (11) penetrate through the second protective cylinder (2), and rubber pads (12) are sealed outside the through holes (11). Fixed cylinders (6) are symmetrically arranged on both sides of the cylinder on the filter plate (5). Expansion rods (7) are slidably arranged in the fixed cylinders (6). Limiting blocks (9) adapted to the limiting grooves (10) are arranged at the ends of the expansion rods (7), and a return spring (8) wound around the expansion rods (7) is arranged between the limiting blocks (9) and the ends of the fixed cylinders (6).

7. The isolated and enclosed fuel filter according to claim 6, wherein: The inner diameter of the cylinder on the filter plate (5) is not less than the inner diameter of the upper part in the second protective cylinder (2).

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