Fuel filter

Abstract

The utility model provides fuel filter belongs to the field of automobile technology, it has solved the problem of not being favorable to installation after the welding of existing fuel filter. The fuel filter, including casing and lid, the lower end of casing has the lower shoulder of the lower insertion part of cylinder shape, the lower end of lid has the upper shoulder of the upper insertion part of cylinder shape, the outer side of upper insertion part is equipped with the lower insertion part, and the lower end surface of upper insertion part and the upper end surface of lower shoulder abut, the outer diameter of upper insertion part is not greater than the outer diameter of lower shoulder, one side of casing has the limit block of convex block shape, the limit port is set up to one side of lid, the limit block is inserted into the limit port, the lid is made of the light -transmitting material, and the welding fixation between the inner side of upper insertion part and the outer side of lower insertion part. The fuel filter has the advantage that is convenient to install.

Description

Technical Field

[0001] This utility model belongs to the field of automotive technology and relates to a fuel filter. Background Technology

[0002] An automotive fuel filter typically consists of a housing, a cover, and a filter element. The cover is attached to the housing, forming a filter chamber for housing the filter element. The cover has an inlet and an outlet port. Fuel enters the filter chamber through the inlet port, is filtered by the filter element, and then exits through the outlet port.

[0003] When assembling existing automotive fuel filters, the cover is usually first placed over the opening of the housing. Then, the seam between the cover and the housing is welded and fixed on the outside of the fuel filter to form an integral fuel filter.

[0004] However, after the fuel filter is welded, it still needs to be installed into a specific mounting cavity in the car. During installation, because the cover and the outer side of the housing are connected by welding, the weld position will inevitably form an outward protruding weld. This weld increases the width of the fuel filter, which may result in a mismatch with the diameter of the mounting cavity, making it difficult to install. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a fuel filter that solves the problem of difficult installation after welding in existing fuel filters.

[0006] The objective of this utility model can be achieved through the following technical solutions: A fuel filter includes a top-open housing and a cover covering the top of the housing. The housing has a cylindrical lower insertion portion at its upper end, and an outwardly protruding, annular lower shoulder at the lower end of the lower insertion portion on the outer side of the housing. The cover has a cylindrical upper insertion portion at its lower end, and an inwardly protruding, annular upper shoulder at the upper end of the upper insertion portion on the inner side of the cover. The upper insertion portion is fitted over the outer side of the lower insertion portion, with its lower end face abutting against the upper end face of the lower shoulder. The outer diameter of the upper insertion portion is not greater than the outer diameter of the lower shoulder. A protruding, block-shaped limiting block is present on one side of the housing, and a corresponding limiting opening is provided on one side of the cover. The limiting block is inserted into the limiting opening. The cover is made of a light-transmitting material, and the inner side of the upper insertion portion and the outer side of the lower insertion portion are welded together.

[0007] During assembly of this fuel filter, the upper insertion part at the lower end of the cover is fitted over the lower insertion part at the upper end of the housing to achieve radial positioning between the cover and the housing. Axial positioning is achieved by the upper insertion part abutting against the lower shoulder. Circumferential positioning is then achieved by a positioning block engaging with the positioning opening, ensuring the stability of the cover and housing after installation and providing a stable foundation for welding. Subsequently, through the cover made of translucent material, laser welding is used to weld and fix the inner surface of the upper insertion part and the outer surface of the lower insertion part, forming a weld between them, thus completing the assembly of the fuel filter.

[0008] This assembly method ensures that the welding position of the fuel filter is located between the inner side of the upper insertion part and the outer side of the lower insertion part, rather than an exposed protruding weld. Furthermore, the outer diameter of the upper insertion part is not greater than the outer diameter of the lower shoulder. In actual production, as long as the outer diameter of the lower shoulder matches the diameter of the mounting cavity, the fuel filter can be easily installed after the assembly and welding are completed.

[0009] In the aforementioned fuel filter, the limiting block is located on the upper end face of the lower shoulder, and the limiting opening is located on the lower end face of the upper insertion portion. The positions of the limiting block and the limiting opening minimize the impact of their placement on the welding process.

[0010] In the aforementioned fuel filter, the top surface of the limiting block is an upward-convex arc surface. The arc surface guides the installation process.

[0011] In another scenario, in the aforementioned fuel filter, the limiting block is located on the outer side of the lower insertion portion, and the limiting opening is located on the inner side of the upper insertion portion. The limiting block can be located on the outer side of the lower insertion portion near its lower end, and the limiting opening can be a notch matching the shape of the limiting block, or a groove formed at the bottom extending to the lower end face of the upper insertion portion.

[0012] In the aforementioned fuel filter, the outer side of the upper end of the lower connector has a rounded chamfer. The chamfer at the upper end of the lower connector facilitates the connection between the upper and lower connectors. Simultaneously, it eliminates the need for a chamfer at the lower end of the upper connector, ensuring the stability of the lower end of the upper connector abutting against the upper side of the lower shoulder, thereby guaranteeing welding quality.

[0013] In the aforementioned fuel filter, the inner diameter of the lower insertion portion is smaller than the inner diameter of the upper shoulder. This results in a larger thickness of the lower insertion portion, ensuring strength.

[0014] Compared with existing technologies, this fuel filter uses the cooperation of the upper insertion part, lower insertion part, upper shoulder, lower shoulder, limiting block and limiting port to limit the cover and shell in all directions after they are fitted, ensuring the stability of the structure after fitting. Furthermore, the welding position is made between the inner side of the cover and the outer side of the shell by laser welding, without protruding from the outer side of the cover and shell, thus avoiding the situation where the welding causes a protruding weld seam that affects the assembly of the fuel filter. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the fuel filter.

[0016] In the figure, 1 is the shell; 1a is the lower insertion part; 1b is the lower shoulder; 1c is the limiting block; 1d is the chamfer; 2 is the cover; 2a is the upper insertion part; 2b is the upper shoulder; 2c is the limiting port. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] like Figure 1 As shown, this fuel filter includes a cylindrical housing 1 and a cover 2. The opening of the housing 1 faces upward, and the opening of the cover 2 faces downward, covering the top of the housing 1.

[0019] The upper end of the housing 1 has a cylindrical lower insertion portion 1a, and the outer side of the housing 1 has an outwardly protruding, annular lower shoulder 1b at the lower end of the lower insertion portion 1a. Correspondingly, the lower end of the cover 2 has a cylindrical upper insertion portion 2a, and the inner side of the cover 2 has an inwardly protruding, annular upper shoulder 2b at the upper end of the upper insertion portion 2a. The upper insertion portion 2a is fitted over the outer side of the lower insertion portion 1a. The lower end face of the upper insertion portion 2a abuts against the upper end face of the lower shoulder 1b, and the upper end face of the lower insertion portion 1a faces the lower end face of the upper shoulder 2b with a gap between them. The outer side of the upper end of the lower insertion portion 1a has a rounded chamfer 1d, and the inner diameter of the lower insertion portion 1a is smaller than the inner diameter of the upper shoulder 2b. In this embodiment, the outer diameter of the upper insertion part 2a is not greater than the outer diameter of the lower shoulder 1b, and preferably the two are equal, that is, the outer surface of the upper insertion part 2a and the outer surface of the lower shoulder 1b are flush.

[0020] The housing 1 has a protruding, block-shaped limiting block 1c on one side, and a corresponding limiting opening 2c is provided on one side of the cover 2, into which the limiting block 1c is inserted. The cover 2 is made of a light-transmitting, unbleached material, which is an existing material. The inner side of the upper insertion part 2a and the outer side of the lower insertion part 1a are fixed by laser welding. In this embodiment, the limiting block 1c is located on the upper side of the lower shoulder 1b, and the top surface of the limiting block 1c is an upwardly convex arc surface. The limiting opening 2c is provided on the lower end surface of the upper insertion part 2a. Of course, if necessary, the limiting block 1c can also be located on the outer side of the lower insertion part 1a, with the limiting opening 2c correspondingly provided on the inner side of the upper insertion part 2a.

[0021] During assembly of this fuel filter, the upper insertion part 2a at the lower end of the cover 2 is fitted onto the outer side of the lower insertion part 1a at the upper end of the housing 1, achieving radial positioning between the cover 2 and the housing 1. Axial positioning is achieved by the upper insertion part 2a abutting against the lower shoulder 1b. Circumferential positioning is achieved by the limiting block 1c engaging with the limiting opening 2c, ensuring the stability of the position of the cover 2 and housing 1 after fitting, providing a stable foundation for welding. Then, through the cover 2 made of translucent material, laser welding is used to weld and fix the inner side of the upper insertion part 2a and the outer side of the lower insertion part 1a, completing the assembly of the fuel filter.

[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A fuel filter, comprising a housing (1) with an open top and a cover (2) covering the top of the housing (1), characterized in that, The upper end of the housing (1) has a cylindrical lower insertion part (1a). The outer side of the housing (1) has an outwardly protruding annular lower shoulder (1b) at the lower end of the lower insertion part (1a). The lower end of the cover (2) has a cylindrical upper insertion part (2a). The inner side of the cover (2) has an inwardly protruding annular upper shoulder (2b) at the upper end of the upper insertion part (2a). The upper insertion part (2a) is fitted onto the outer side of the lower insertion part (1a), and the upper insertion part (2a)... The lower end face of the upper plug (2a) abuts against the upper end face of the lower shoulder (1b). The outer diameter of the upper plug (2a) is not greater than the outer diameter of the lower shoulder (1b). The housing (1) has a protruding block-shaped limiting block (1c) on one side. The cover (2) has a corresponding limiting opening (2c) on one side. The limiting block (1c) is inserted into the limiting opening (2c). The cover (2) is made of light-transmitting material. The inner side of the upper plug (2a) and the outer side of the lower plug (1a) are welded and fixed together.

2. The fuel filter according to claim 1, characterized in that, The limiting block (1c) is located on the upper end face of the lower shoulder (1b), and the limiting port (2c) is opened on the lower end face of the upper insertion part (2a).

3. The fuel filter according to claim 2, characterized in that, The top surface of the limiting block (1c) is an upwardly convex arc surface.

4. The fuel filter according to claim 1, characterized in that, The limiting block (1c) is located on the outside of the lower insertion part (1a), and the limiting port (2c) is opened on the inside of the upper insertion part (2a).

5. The fuel filter according to any one of claims 1 to 4, characterized in that, The outer side of the upper end of the lower insertion part (1a) has a rounded chamfer (1d).

6. The fuel filter according to any one of claims 1 to 4, characterized in that, The inner diameter of the lower insertion part (1a) is smaller than the inner diameter of the upper shoulder (2b).

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