Multi-filtering type fuel filter

Abstract

The utility model discloses a multi-filtering type fuel filter which comprises a bottom shell, an upper cover is arranged at the upper end of the bottom shell, the upper cover is connected to the outer surface of the upper end of the bottom shell through threads, a hexagonal protrusion is arranged on the upper surface of the upper cover, a hexagonal groove is formed in the surface of the hexagonal protrusion, and the hexagonal groove is in threaded connection with the hexagonal protrusion. An oil inlet pipe is arranged on the surface of the inner side of the lower end of the bottom shell, guide-out holes are formed in the outer surface of the oil inlet pipe and evenly distributed in the outer surface of the oil inlet pipe, the surface of the inner side of the bottom shell is filled with a filter element, and an oil outlet pipe opening is formed in the surface of the outer side of the bottom shell. A positioning ring is fixedly connected to the inner side surface of the lower end of the bottom shell, a variable-diameter annular cavity is formed in the inner side of the positioning ring, fuel oil is effectively filtered in a multi-layer mode through the filter element made of the multi-layer composite material, chips cannot be generated due to aging, a bottom pressure relief and oil return part is arranged to be of a variable-diameter meshing structure, internal and external abutting fit sealing can be achieved, and the service life of the fuel oil filter is prolonged. The sealing performance of the oil return valve is improved, and the filtering performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of multiple filtering type fuel filter, more specifically, to a multiple filtering type fuel filter. BACKGROUND

[0002] In the filter, it refers to the accessory that the filter paper plays the role of filtering impurities or gas, generally refers to the automobile filter, it is the accessory of engine, is divided into according to different filtering functions: oil filter, fuel filter (gasoline filter, diesel filter, oil-water separator, hydraulic filter), air filter, air conditioner filter and so on;

[0003] The current filter is mostly single-filter barrel structure, the filter screen on the barrel body of single-structure filter barrel can only provide filtering for fixed-size substances, and the filter paper in the filter provides filtering for small impurities in the oil body, and the traditional paper body is mostly single-layer paper body structure, so the filtering capacity is limited, and the best water filtering effect cannot be achieved.

[0004] In the prior art, such as the utility model disclosed in authorized announcement No. CN213392457U, a double multiple filtering type fuel filter is disclosed, which comprises a shell, filter paper and a filter barrel, the filter paper and the filter barrel are located in the shell, the filter barrel comprises a first filter barrel and a second filter barrel, the second filter barrel is embedded in the first filter barrel, a first filter screen is arranged on the barrel body of the first filter barrel, annular top seats are arranged at the top ends of the first filter barrel and the second filter barrel, a bottom seat is arranged at the bottom of the first filter barrel, and a first embedding hole is arranged on the annular top seat at the top end of the first filter barrel. The filter adopts a double-filter barrel embedding structure, the double-filter barrel adopts a buckle hole embedding mode, is convenient to disassemble and assemble, different sizes of filter screens can provide double filtering for impurities in the oil body, further improve the oil product, enhance the oil combustion efficiency, and the composite filter paper can enhance the filtering effect of the oil body when filtering, more comprehensively filters small impurity particles in the oil product, and makes the filtering more thorough.

[0005] In the above-mentioned patent, composite multi-layer filtering is adopted, but a sponge assembly is arranged inside to filter the oil product, the sponge material cannot be used in oil filtering, the sponge material will be corroded and aged when immersed in gasoline and diesel, the sponge itself will produce debris, the sponge holes are relatively large, the molecular structure of the oil body is small, and effective filtering cannot be achieved, and when the fuel filter filters, the oil pressure is prevented after oil enters, a pressure relief and oil return structure is arranged, the existing technical structure is mostly a valve piece type structure, is directly covered and positioned, the sealing is not enough, oil return also occurs when the pressure is not large, and the filtering performance is affected. Utility model content

[0006] The utility model discloses a multiple filtration formula fuel filter which adopts the filter filter core of multilayer composite material, effectively filters fuel in multiple layers, does not appear the debris of aging, and the bottom pressure relief oil return part is set to the variable diameter occlusion structure, can be in and out top and press against the seal of close, improves the sealing performance of oil return valve, improves the filtering performance.

[0007] To solve the above problems, the utility model adopts the following technical scheme.

[0008] A multiple filtration formula fuel filter, including the bottom shell, the upper end of bottom shell is provided with the upper cover, the upper cover is connected through the screw on the upper end outer surface of bottom shell, the upper surface of upper cover is provided with the hexagonal convex, the surface of hexagonal convex is provided with hexagonal recess, the lower end inner side surface of bottom shell is provided with the oil inlet pipe, the outer surface of oil inlet pipe is provided with the lead-out hole, the lead-out hole evenly distributes and is provided on the outer surface of oil inlet pipe, the inner side surface of bottom shell is filled with filter filter core, the outer side surface of bottom shell is provided with the oil outlet pipe, the lower end inner side surface of bottom shell is fixedly connected with the positioning ring, the inner side of positioning ring is provided with the variable diameter ring cavity, the inner side surface of variable diameter ring cavity of positioning ring is slidably connected with the variable diameter ring, the inner end surface of oil inlet pipe is sleeved with the spring, the upper surface of spring is extruded on the lower surface of variable diameter ring, the lower surface of bottom shell is provided with the oil return pipe, by adopting the filter filter core of multilayer composite material, effectively filters fuel in multiple layers, does not appear the debris of aging, and the bottom pressure relief oil return part is set to the variable diameter occlusion structure, can be in and out top and press against the seal of close, improves the sealing performance of oil return valve, improves the filtering performance.

[0009] Further, the oil return pipe is arranged on the inner side surface of the positioning ring of the bottom shell.

[0010] Further, the outer surface of the variable diameter ring is covered with a rubber layer that is tightly attached to the inner side surface of the variable diameter ring cavity of the positioning ring.

[0011] Further, the filter filter core adopts a composite filter core structure, and the filter filter core is made of nylon filter cloth, glass fiber filter paper, chemical fiber filter paper and polyester fiber filter paper.

[0012] Further, the nylon filter cloth of the filter filter core is sleeved on the outer surface of the positioning ring.

[0013] Further, the inner side surface of the upper cover is provided with a rubber pad, and the upper end outer surface of the bottom shell is provided with a sealing ring.

[0014] Further, the outer surface of the bottom shell is provided with a ring groove, and the sealing ring is sleeved on the inner side surface of the ring groove of the bottom shell.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] (1) through the use of multi-layer composite material filter core, effective multi-layer filter fuel, will not be aging debris, bottom pressure relief return oil part is set to variable diameter occlusion structure, can be inside and outside top close seal, improve the sealing performance of the return valve, improve the filtering performance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the first schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is the second schematic diagram of the overall structure of the utility model;

[0019] Figure 3 is the third schematic diagram of the overall structure of the utility model;

[0020] Figure 4 is the schematic diagram of the overall structure of the utility model;

[0021] Figure 5 is the schematic diagram of the local structure of the positioning ring of the utility model.

[0022] Explanation of reference numerals in the drawing:

[0023] 1 bottom shell, 2 upper cover, 3 oil inlet pipe, 4 lead-out hole, 5 filter core, 6 oil outlet pipe, 7 positioning ring, 8 variable diameter ring, 9 spring, 10 return oil pipe, 80 rubber layer, 51 nylon filter cloth, 52 glass fiber filter paper, 53 chemical fiber filter paper, 54 polyester fiber filter paper, 20 rubber pad, 21 sealing ring. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Embodiment 1: please refer to Figures 1-5The utility model provides a kind of multiple filtering fuel filter, including bottom shell 1, the upper end of bottom shell 1 is provided with upper cover 2, upper cover 2 is connected by screw on the upper end outer surface of bottom shell 1, the upper surface of upper cover 2 is provided with hexagonal boss 11, the surface of hexagonal boss 11 is provided with hexagonal groove 12, the lower end inner side surface of bottom shell 1 is provided with oil inlet pipe 3, the outer surface of oil inlet pipe 3 is provided with lead-out hole 4, lead-out hole 4 is evenly distributed and is provided on the outer surface of oil inlet pipe 3, the inner side surface of bottom shell 1 is filled with filter element 5, the outer side surface of bottom shell 1 is provided with oil outlet pipe 6, the lower end inner side surface of bottom shell 1 is fixedly connected with positioning ring 7, the inner side of positioning ring 7 is provided with variable-diameter ring cavity, the inner side surface of variable-diameter ring cavity of positioning ring 7 is slidably connected with variable-diameter ring 8, the inner end surface of oil inlet pipe 3 is sleeved with spring 9, the upper surface of spring 9 is extruded on the lower surface of variable-diameter ring 8, the lower surface of bottom shell 1 is provided with oil return pipe 10;By adopting the filter element of multilayer composite material, effectively multilayer filter fuel, will not be aged and appear debris, bottom pressure relief oil return part is set to variable-diameter bite structure, can be inside and outside top and press fit seal, improve the sealing performance of oil return valve, improve filtering performance;

[0026] Oil return pipe 10 is respectively arranged at the inner side surface of the positioning ring 7 of bottom shell 1;When oil pressure is large, the positioning ring 7 can be extruded and lowered, so that the oil flows downward and is guided back through the oil return pipe 10;

[0027] The outer surface of variable-diameter ring 8 is covered with rubber layer 80, and the rubber layer 80 is tightly fitted to the inner side surface of the variable-diameter ring cavity of the positioning ring 7;Increase the sealing performance when fitting, the variable-diameter surface of the variable-diameter ring 8 is fitted in the variable-diameter ring cavity of the positioning ring 7, to increase the fitting and sealing performance, and the inside and outside are engaged and sealed to improve the sealing performance;

[0028] The filter element 5 adopts a composite filter element structure, and is made of nylon filter cloth 51, glass fiber filter paper 52, chemical fiber filter paper 53 and polyester fiber filter paper 54; the filter element 5 can perform multi-layer filtration, from coarse to fine filtration; the nylon filter cloth 51 can filter the first layer, and the nylon filter cloth 51 is wear-resistant and will not be damaged when being sleeved on the outer surface of the positioning ring 7; the nylon filter cloth 51 further passes through the second layer of the glass fiber filter paper 52 and the chemical fiber filter paper 53 for filtration, and finally high-precision filtration is performed through the polyester fiber filter paper 54; the advantages of the polyester fiber filter paper mainly include high strength and wear resistance, good chemical stability, strong air permeability and environmental protection sustainability; these characteristics make the polyester fiber filter paper widely used in many fields; the polyester fiber filter paper has high strength and wear resistance, can withstand large pressure and friction, maintains the integrity and filtration efficiency of the filter paper; the high strength and wear resistance enable the filter paper to maintain stable performance during long-time use, reduce the replacement frequency and thus reduce the cost; the polyester fiber filter paper has good chemical stability and is resistant to erosion of various chemicals, which makes it excellent in handling fluids containing corrosive substances and difficult to be damaged;

[0029] The nylon filter cloth 51 of the filter element 5 is sleeved on the outer surface of the positioning ring 7; the positioning and installation are facilitated; the upper cover 2 is threadedly connected to the upper end outer surface of the bottom shell 1; the upper surface of the upper cover 2 is provided with a hexagonal protrusion 11; the surface of the hexagonal protrusion 11 is provided with a hexagonal groove 12; the threaded installation is facilitated; the hexagonal protrusion 11 can be clamped and twisted by a spanner; the hexagonal groove 12 can be clamped and twisted by an internal hexagon; the installation and dismounting are facilitated;

[0030] The inner surface of the upper cover 2 is provided with a rubber pad 20; the upper end outer surface of the bottom shell 1 is provided with a sealing ring 21; the sealing performance of the upper cover 2 after installation is increased; the outer surface of the bottom shell 1 is provided with a ring groove; the sealing ring 21 is sleeved on the inner surface of the ring groove of the bottom shell 1; the upper cover 2 is pressed downward to seal the sealing ring 21 after installation.

[0031] The above merely describes a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical scheme of the present application and the improved concept thereof within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A multiple filtration fuel filter comprising a bottom housing (1), characterized in that: The upper end of the bottom shell (1) is provided with an upper cover (2), the upper cover (2) is connected on the upper end outer surface of the bottom shell (1) by thread, the upper surface of the upper cover (2) is provided with a hexagonal convex (11), the surface of the hexagonal convex (11) is provided with a hexagonal groove (12), the inner side surface of the lower end of the bottom shell (1) is provided with an oil inlet pipe (3), the outer surface of the oil inlet pipe (3) is provided with a lead-out hole (4), the lead-out holes (4) are evenly distributed on the outer surface of the oil inlet pipe (3), the inner side surface of the bottom shell (1) is filled with a filter element (5), the outer side surface of the bottom shell (1) is provided with an oil outlet pipe (6), the inner side surface of the lower end of the bottom shell (1) is fixedly connected with a positioning ring (7), the inner side of the positioning ring (7) is provided with a variable diameter ring cavity, the variable diameter ring cavity of the positioning ring (7) is slidably connected with a variable diameter ring (8), the inner end surface of the oil inlet pipe (3) is sleeved with a spring (9), the upper surface of the spring (9) is pressed on the lower surface of the variable diameter ring (8), and the lower surface of the bottom shell (1) is provided with an oil return pipe (10).

2. The multiple filter fuel filter of claim 1 wherein: The oil return pipe (10) is arranged on the inner side surface of the positioning ring (7) of the bottom shell (1).

3. The multiple filter fuel filter of claim 1 wherein: The outer surface of the variable diameter ring (8) is covered with a rubber layer (80), and the rubber layer (80) is tightly attached to the inner side surface of the variable diameter ring cavity of the positioning ring (7).

4. The multiple filter fuel filter of claim 1 wherein: The filter element (5) adopts a composite filter element structure, and the filter element (5) is made of a nylon filter cloth (51), a glass fiber filter paper (52), a chemical fiber filter paper (53) and a polyester fiber filter paper (54).

5. The multiple filter fuel filter of claim 4 wherein: The nylon filter cloth (51) of the filter element (5) is sleeved on the outer surface of the positioning ring (7).

6. The multiple filter fuel filter of claim 1 wherein: The inner side surface of the upper cover (2) is provided with a rubber pad (20), and the upper end outer surface of the bottom shell (1) is provided with a sealing ring (21).

7. A multi-filter fuel filter according to claim 6, characterized in that: The outer surface of the bottom shell (1) is provided with a ring groove, and the sealing ring (21) is sleeved on the inner side surface of the ring groove of the bottom shell (1).

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