Filter screen assembly for liquid level sensor in urea box

Abstract

The utility model discloses a filter screen assembly for a liquid level sensor in a urea box. The filter screen assembly comprises a filter screen body and an anti-blocking filter screen. The filter screen main body comprises an outer screen sheet, an outer prism, an inner screen sheet and an inner prism; the anti-blocking filter screen comprises fixed supporting legs, anti-blocking prisms and inclined filter screen sheets. According to the scheme, the filter screen assembly is improved from two layers in the prior art to form three-dimensional filtration, the area of the whole filter screen assembly is increased, the liquid suction area can be effectively increased, the filtering effect is improved, and a urea nozzle for spraying liquid is prevented from being blocked after liquid suction; the meshes on the two sides of the anti-blocking filter screen are arranged in a V-shaped structure, so that the area of a urea liquid inlet is large, the filtering area of urea liquid can be increased, meanwhile, the urea liquid on the urea liquid level sensor can be pumped back to wash the inner mesh component, filtered impurities can be concentrated at the tip of the inner mesh component under the impact of the urea liquid, and the filtering effect of the urea liquid is improved. The meshes on the two sides are not easy to block, and the service life of the filter screen assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of urea liquid filter screens, and in particular to a filter screen component for a liquid level sensor in a urea tank. Background Art

[0002] Urea injection system is an important device for after-treatment of exhaust emissions of light trucks. The SCR urea tank sensor in the SCR system is one of the essential components. The urea tank sensor is usually composed of a plastic head, a heating tube, a float-type liquid level sensor, a urea tube, a filter assembly and other components.

[0003] The filter mesh area of ​​the existing filter assembly installed at the bottom of the urea pipe is mostly designed to be 2020 square millimeters, with a small surface area. In addition, the filter cloth is clamped between the outer filter shell frame and the inner filter shell frame. The filtering effect of a single filter cloth is low. When some mesh holes are blocked, the flow rate of urea liquid extracted by the urea pipe will be seriously affected, and the problem of insufficient urea injection will easily occur, which is not conducive to the subsequent treatment of automobile exhaust gas. It needs to be improved.

[0004] Useful content

[0005] The purpose of this section is to summarize some aspects of the embodiments of this utility and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and practical name of this application to avoid blurring the purpose of this section, specification abstract and practical name, and such simplifications or omissions cannot be used to limit the scope of this utility.

[0006] Therefore, in order to solve the above technical problems, the present invention provides the following technical solutions: a filter assembly for a liquid level sensor in a urea tank, comprising a filter body and an anti-blocking filter;

[0007] The filter body comprises an outer mesh sheet, an outer prism, an inner mesh sheet and an inner prism, wherein the outer prisms are arranged in multiple groups at intervals, and the multiple groups of outer prisms are connected by the outer mesh sheet; the inner prisms are arranged on the inner side of the outer prisms, and the inner prisms are arranged in multiple groups, and the multiple groups of inner prisms are connected by the inner mesh sheet, and the outer prisms and the inner prisms are arranged alternately;

[0008] The anti-blocking filter screen includes fixed legs, anti-blocking prisms and inclined filter mesh sheets. The cross-section of the anti-blocking filter screen is a "V"-shaped structure. The opening surface of the anti-blocking filter screen is arranged toward the outer mesh sheet. Both sides of the opening surface of the anti-blocking filter screen are connected to fixed legs. One end of the inclined filter mesh sheet is connected to the fixed legs, and the fixed legs are fixed to the outer mesh sheet by fasteners. The other end of the inclined filter mesh sheet is connected to the anti-blocking prism, and the anti-blocking prism is fixed to the outer prism.

[0009] As a preferred solution of the filter assembly for the liquid level sensor in the urea tank of the present invention, the outer mesh sheet and the inner mesh sheet are arranged with a front-to-rear gap, and the anti-blocking filter screen is arranged between the outer mesh sheet and the inner mesh sheet.

[0010] As a preferred solution of the filter assembly for the liquid level sensor in the urea tank of the present invention, the upper and lower ends of the filter body are connected to a filter frame, the filter frame is fixed on the urea liquid level sensor, and one side of the urea liquid level sensor is connected to a urea heating solenoid valve.

[0011] As a preferred solution of the filter assembly for the liquid level sensor in the urea tank of the present invention, the urea liquid level sensor is connected to a urea liquid return pipe, which is connected to the top of the filter body, and the inner mesh assembly is flushed by the back draw of urea liquid.

[0012] As a preferred solution of the filter assembly for the liquid level sensor in the urea tank of the present invention, the urea liquid level sensor is fixed on a sealing seat, a sealing ring is connected to the sealing seat, and the sealing ring is sealed and fixed to the urea tank.

[0013] As a preferred solution of the filter assembly for the liquid level sensor in the urea tank of the present invention, a toothed ring opening is provided on the urea tank, and the structure of the sealing ring is adapted to the toothed ring opening structure.

[0014] Beneficial effects of this utility:

[0015] 1. A filter assembly for a liquid level sensor in a urea tank is proposed in the present invention. The filter assembly is improved from the two-layer filter assembly in the prior art to a three-dimensional filter. The area of ​​the overall filter assembly is increased, which can effectively increase the liquid absorption area, improve the filtering effect, and prevent the urea nozzle that sprays liquid from being blocked after absorbing liquid.

[0016] 2. A filter assembly for a liquid level sensor in a urea tank is proposed in the present invention. The meshes on both sides of the anti-blocking filter are arranged in a "V" shape, so that the area at the inlet of the urea liquid is larger, which can increase the filtering area of ​​the urea liquid. At the same time, the urea liquid on the urea liquid level sensor can be back-drawn to flush the inner mesh assembly. The filtered impurities can be concentrated at the tip under the impact of the urea liquid, and are not easy to clog the meshes on both sides, thereby extending the service life of the filter assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the practical embodiment, the following is a brief introduction to the drawings required for the description of the embodiment. Obviously, the drawings described below are only some embodiments of the practical embodiment. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 Schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of the rear view structure of the present utility model.

[0020] Figure 3 This is a top view structural diagram of the present utility model.

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the sealing ring of this utility model.

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the filter body and the anti-clogging filter of this utility model.

[0023] Figure 6 This is a schematic diagram of the partial connection structure between the filter body and the anti-blocking filter of this utility model.

[0024] In the figure: 100, filter body; 101, outer mesh; 102, outer prism; 103, inner mesh; 104, inner prism; 105, filter frame;

[0025] 200, anti-blocking filter screen; 201, fixed support foot; 202, anti-blocking prism; 203, inclined filter screen;

[0026] 300, urea liquid level sensor; 301, urea liquid return pipe;

[0027] 400, urea heating solenoid valve;

[0028] 500, sealing seat; 501, sealing ring. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention, so the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the present embodiment in detail, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Reference Figures 1 to 6 , as an embodiment of the present utility, a filter assembly for a liquid level sensor in a urea tank is provided, comprising a filter body 100 and an anti-blocking filter 200;

[0034] The filter body 100 includes an outer mesh sheet 101, an outer prism 102, an inner mesh sheet 103 and an inner prism 104. The outer prisms 102 are arranged in multiple groups at intervals, and the multiple groups of outer prisms 102 are connected by the outer mesh sheet 101; the inner prisms 104 are arranged on the inner side of the outer prisms 102, and the inner prisms 104 are arranged in multiple groups, and the multiple groups of inner prisms 104 are connected by the inner mesh sheet 103, and the outer prisms 102 and the inner prisms 104 are arranged alternately; the outer mesh sheet 101 and the inner mesh sheet 103 are arranged in a front-to-back gap, and the anti-blocking filter 200 is arranged between the outer mesh sheet 101 and the inner mesh sheet 103; the upper and lower ends of the filter body 100 are connected A filter frame 105 is provided, the filter frame 105 is fixed on the urea liquid level sensor 300, and a urea heating solenoid valve 400 is connected to one side of the urea liquid level sensor 300; a urea liquid return pipe 301 is connected to the urea liquid level sensor 300, and the urea liquid return pipe 301 is connected to the top of the filter body 100, and the inner mesh assembly is flushed by the urea liquid backflow; the urea liquid level sensor 300 is fixed on the sealing seat 500, and a sealing ring 501 is connected to the sealing seat 500, and the sealing ring 501 is sealed and fixed to the urea tank; a toothed ring opening is opened on the urea tank, and the structure of the sealing ring 501 is adapted to the toothed ring opening structure;

[0035] The anti-blocking filter 200 includes a fixed support leg 201, an anti-blocking prism 202 and an inclined filter mesh 203. The cross-section of the anti-blocking filter 200 is a "V"-shaped structure. The opening surface of the anti-blocking filter 200 is arranged toward the outer mesh 101. Both sides of the opening surface of the anti-blocking filter 200 are connected to the fixed support leg 201. One end of the inclined filter mesh 203 is connected to the fixed support leg 201, and the fixed support leg 201 is fixed to the outer mesh 101 by a fastener; the other end of the inclined filter mesh 203 is connected to the anti-blocking prism 202, and the anti-blocking prism 202 is fixed to the outer prism 102.

[0036] In this embodiment: This solution improves the filter assembly from the two-layer in the prior art to a three-dimensional filtration. When in use, when the urea liquid passes through, the large particles of impurities in the urea liquid can be first filtered through the outer mesh 101, and then filtered twice through the anti-clogging filter 200, and finally filtered three times through the inner mesh 103. The specification of the outer mesh 101 is preferably a 35um mesh. The area of ​​the overall filter assembly is increased to 5050 square millimeters compared to 2020 square millimeters in the prior art, which can effectively increase the liquid absorption area, improve the filtering effect, and prevent the urea nozzle that sprays liquid from being blocked after absorbing liquid.

[0037] At the same time, the meshes on both sides of the anti-clogging filter 200 are arranged in a "V" shape, so that the area at the urea liquid inlet is larger, which can increase the filtering area of ​​the urea liquid. At the same time, the urea liquid on the urea liquid level sensor 300 can be drawn back to flush the inner mesh assembly, and the filtered impurities can be concentrated at the tip under the impact of the urea liquid, which is not easy to clog the meshes on both sides, thereby extending the service life of the filter assembly.

[0038] It is worth noting that the entire device is controlled by a controller. Since the controller is a commonly used device and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A filter assembly for a liquid level sensor in a urea tank, characterized in that: It comprises a filter screen body (100) and an anti-blocking filter screen (200); The filter screen body (100) comprises an outer mesh sheet (101), an outer prism (102), an inner mesh sheet (103) and an inner prism (104); the outer prisms (102) are arranged in multiple groups at intervals, and the multiple groups of outer prisms (102) are connected by the outer mesh sheet (101); the inner prisms (104) are arranged on the inner side of the outer prisms (102); the inner prisms (104) are arranged in multiple groups, and the multiple groups of inner prisms (104) are connected by the inner mesh sheet (103); the outer prisms (102) and the inner prisms (104) are arranged in a staggered manner; The anti-blocking filter (200) comprises a fixed support leg (201), an anti-blocking prism (202) and an inclined filter sheet (203); the cross section of the anti-blocking filter (200) is in a "V"-shaped structure; the opening surface of the anti-blocking filter (200) is arranged toward the outer sheet (101); both sides of the opening surface of the anti-blocking filter (200) are connected to the fixed support leg (201); one end of the inclined filter sheet (203) is connected to the fixed support leg (201), and the fixed support leg (201) is fixed to the outer sheet (101) via a fastener; the other end of the inclined filter sheet (203) is connected to the anti-blocking prism (202), and the anti-blocking prism (202) is fixed to the outer prism (102).

2. The filter assembly for the urea tank liquid level sensor according to claim 1, characterized in that: The outer mesh sheet (101) and the inner mesh sheet (103) are arranged with a front-to-rear gap, and the anti-blocking filter screen (200) is arranged between the outer mesh sheet (101) and the inner mesh sheet (103).

3. The filter assembly for the urea tank liquid level sensor according to claim 1, characterized in that: The upper and lower ends of the filter body (100) are both connected to a filter frame (105), the filter frame (105) is fixed on a urea liquid level sensor (300), and one side of the urea liquid level sensor (300) is connected to a urea heating solenoid valve (400).

4. The filter assembly for the urea tank liquid level sensor according to claim 3, characterized in that: The urea liquid level sensor (300) is connected to a urea liquid return pipe (301), and the urea liquid return pipe (301) is connected to the top end of the filter body (100).

5. The filter assembly for the liquid level sensor in the urea tank according to claim 3, characterized in that: The urea liquid level sensor (300) is fixed on a sealing seat (500), a sealing ring (501) is connected to the sealing seat (500), and the sealing seat (500) is sealed and fixed on the urea tank through the sealing ring (501).

6. The filter assembly for the liquid level sensor in the urea tank according to claim 5, characterized in that: The urea tank is provided with a toothed ring opening, and the structure of the sealing ring (501) is adapted to the toothed ring opening structure.

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