Stable sealing type gasoline filter

Abstract

Precise positioning of a pressure valve is achieved through a positioning seat and a positioning plug-in unit, the positioning plug-in unit made of rubber materials is adopted to enhance sealing performance and optimize the internal structure of the pressure valve, pressure control is achieved through matching of a diaphragm, a sealing ring and a spring, and the problems that a traditional pressure valve is not tight in sealing and not reliable in positioning are solved. The device has the characteristics of accurate positioning, good sealing and stable work, and is suitable for an automobile fuel oil filtering system.

Description

TECHNICAL FIELD

[0001] The utility model relates to gasoline filter technology field, concretely relates to a stable seal type gasoline filter. BACKGROUND

[0002] The gasoline filter is the key part of automobile fuel filtration, in order to maintain the stability of gasoline supply pressure, generally sets up pressure valve in gasoline filter, and the traditional pressure valve structure is sealed between the oil outlet pipe and the outer wall of pressure valve in filter, which leads to the sealing is not tight, and also causes the positioning of pressure valve to be unreliable, so that it is easy to deviate, greatly influences the stability of the work of pressure valve. SUMMARY

[0003] To solve the above problems, the utility model discloses a stable seal type gasoline filter, which aims to improve the sealing tightness and positioning reliability of the pressure valve and ensure the working stability.

[0004] To achieve the above object, the utility model provides the following technical scheme: a stable seal type gasoline filter, comprising: a shell, the inner chamber of which is provided with a partition plate, a filter element is installed below the partition plate, and a pressure valve is installed above the partition plate, the lower end of the shell is connected with an oil inlet pipe, and the upper end of the shell is connected with an oil outlet pipe and a return pipe, the oil outlet pipe and the oil inlet pipe are coaxially arranged, a through hole coaxial with the oil inlet pipe is formed in the partition plate, a positioning seat is installed on the through hole, the bottom of the pressure valve is positioned and inserted on the positioning seat through a rubber element, and a positioning insert is inserted into the inner end of the oil outlet pipe, and the lower end of the positioning insert is positioned and matched with the valve shell of the pressure valve.

[0005] The pressure valve comprises a middle pipe and a valve shell welded on the outer wall of the middle pipe, a diaphragm is arranged in the valve shell, a spring positioning seat and a spring are arranged above the diaphragm, the spring positioning seat is sleeved on the lower part of the spring, a dynamic sealing ring and a fixed sealing ring are arranged below the diaphragm, the dynamic sealing ring is connected with the diaphragm, the fixed sealing ring is connected with the bottom of the inner chamber of the valve shell, the dynamic sealing ring is in contact and sealed with the fixed sealing ring under the elastic force of the spring, the middle pipe and the valve shell have an annular positioning ring groove, the positioning insert is a tubular element, an annular positioning ring is arranged on the lower part of the positioning insert, the positioning ring is matched with the positioning ring groove, the positioning insert is sleeved on the middle pipe, the lower port of the positioning insert is inserted into the positioning ring groove, and the upper port of the positioning insert is inserted into the inner hole of the oil outlet pipe.

[0006] The positioning seat is an annular body, comprising a large pipe body with a large pipe diameter in the upper part and a small pipe body with a small pipe diameter in the lower part, the small pipe body is inserted on the through hole of the partition plate through a sealing ring, and the bottom of the pressure valve is installed in the large pipe body; the small pipe body of the positioning seat is inserted into the through hole of the partition plate.

[0007] The positioning insert is made of rubber.

[0008] The outer wall of the valve shell is provided with an outlet hole, and the outlet hole is communicated with the return pipe.

[0009] The utility model discloses the beneficial effects are:

[0010] 1. Positioning seat and positioning insert realize the accurate positioning of pressure valve;

[0011] 2. Rubber material positioning insert enhances the sealing property;

[0012] 3. Pressure valve structure optimization, stable and reliable work.

[0013] The utility model will be further described below in connection with the drawings and specific embodiment. DRAWINGS

[0014] Figure 1 It is the structure diagram of the specific embodiment of the utility model;

[0015] Figure 2 It is the structure diagram of positioning insert in the specific embodiment of the utility model;

[0016] Figure 3 It is Figure 1 the enlarged view of A in the middle.

[0017] Reference signs: 1 - shell, 2 - baffle, 3 - filter core, 4 - pressure valve, 41 - middle pipe, 42 - valve shell, 43 - diaphragm, 44 - spring positioning seat, 45 - spring, 46 - dynamic sealing ring, 47 - fixed sealing ring, 5 - oil inlet pipe, 6 - oil outlet pipe, 7 - backflow pipe, 8 - positioning seat, 81 - big pipe body, 82 - small pipe body, 9 - positioning insert, 91 - positioning ring. SPECIFIC EMBODIMENT

[0018] The utility model will be further described below in connection with the drawings and specific embodiment.

[0019] As Figure 1 — Figure 3 Indicated, this embodiment discloses a kind of stable sealing type gasoline filter provided by the embodiment, its structure and working principle are as follows:

[0020] I, overall structure composition

[0021] As Figure 1 And Figure 2 Indicated, the stable sealing type gasoline filter includes shell 1, baffle 2, filter core 3, pressure valve 4, oil inlet pipe 5, oil outlet pipe 6, backflow pipe 7, positioning seat 8 and positioning insert 9.

[0022] Housing 1: cylindrical metal shell, inside which a closed inner cavity is formed, the lower end is connected or welded with the oil inlet pipe 5 (used to access the high-pressure gasoline of the fuel system), the upper end is connected or welded with the oil outlet pipe 6 (used to output the filtered clean gasoline) and the return pipe 7 (used to guide the overpressure gasoline). The oil outlet pipe 6 is coaxially arranged with the oil inlet pipe 5 (the center lines coincide), which ensures smooth flow of the fuel.

[0023] Partition plate 2: fixed in the middle of the inner cavity of the housing 1, which divides the inner cavity into the lower filter cavity (containing the filter element 3) and the upper valve cavity (containing the pressure valve 4). The center position of the partition plate 2 is provided with a circular perforation coaxial with the oil inlet pipe 5 (the diameter is slightly larger than the outer diameter of the small pipe body 82 of the positioning seat 8).

[0024] Filter element 3: a folded filter paper filter element, installed in the filter cavity below the partition plate 2, used to intercept impurity particles in gasoline.

[0025] Pressure valve 4: installed in the valve cavity above the partition plate 2, is the core component of controlling overpressure relief.

[0026] II. Detailed connection relationship of key components

[0027] 1. Positioning of the positioning seat 8 and the bottom of the pressure valve 4

[0028] The perforation is provided with a positioning seat 8, which is an annular body structure, including a large pipe body 81 with a large diameter in the upper part (the outer diameter matches the diameter of the perforation) and a small pipe body 82 with a small diameter in the lower part (the outer diameter is smaller than the diameter of the perforation). The small pipe body 82 is inserted into the perforation of the partition plate 2 through a rubber sealing ring (embedded in the annular groove on the outer wall of the small pipe body 82), realizing sealed fixation with the partition plate 2; the large pipe body 81 is located above the partition plate 2, which is hollow inside and smooth in the inner wall.

[0029] The bottom of the pressure valve 4 (the bottom end of the middle pipe 41) is positioned and inserted into the large pipe body 81 through a rubber part (such as an annular rubber pad). The rubber part not only plays a buffering and damping role, but also ensures the close fit of the bottom of the pressure valve 4 and the positioning seat 8, preventing gasoline from leaking from the gap at the bottom.

[0030] 2. Positioning of the positioning insert 9 and the top of the pressure valve 4 and connection of the oil outlet pipe 6

[0031] A positioning insert 9 is installed at the inner end of the oil outlet pipe 6 (the end closest to the valve cavity). It is a tubular component made of rubber (with a certain elastic deformation capability). The lower part is provided with an annular positioning ring 91 (an annular protrusion protruding from the outer wall of the positioning insert 9). The positioning ring 91 cooperates with the upper end face of the valve body 42 and the positioning ring groove. There is an annular positioning ring groove between the middle pipe 41 of the pressure valve 4 and the valve body 42 (opened on the inner wall of the valve body 42, with a depth of about 2-3mm). The positioning ring at the lower part of the positioning insert 9 is embedded in the positioning ring groove to achieve radial limitation of the upper part of the pressure valve 4 (preventing its lateral displacement). At the same time, the positioning insert 9 is sleeved on the outer wall of the middle pipe 41 (the middle pipe 41 is a metal rigid pipe that provides support), and its lower end is inserted into the positioning ring groove to further restrict the axial movement of the pressure valve 4.

[0032] The upper port of the positioning plug 9 is inserted into the inner hole of the oil outlet pipe 6 (interference fit). Through the elastic deformation of the rubber material, it fits tightly against the inner wall of the oil outlet pipe 6, which not only achieves a sealed connection between the oil outlet pipe 6 and the pressure valve 4, but also ensures the reliable fixation of the positioning plug 9 itself.

[0033] 3. Internal structure of pressure valve 4

[0034] like Figure 3 As shown, the pressure valve 4 includes a central tube 41 (a rigid metal tube running vertically through the valve) and a valve body 42 (a metal shell forming an annular cavity with the central tube 41) welded to the outer wall of the central tube 41. A diaphragm 43 (an elastic rubber film with a center that can bulge upwards) is disposed inside the valve body 42. A spring positioning seat 44 (a metal ring) and a spring 45 (a compression spring, with its upper end abutting against the inner top wall of the valve body 42 and its lower end abutting against the spring positioning seat 44) are fixed above the diaphragm 43. A dynamic sealing ring 46 (a rubber ring bonded to the lower surface of the diaphragm 43) and a fixed sealing ring 47 (a metal ring fixed to the bottom of the inner cavity of the valve body 42) are disposed below the diaphragm 43. Under normal conditions, the elastic force of the spring 45 keeps the dynamic sealing ring 46 and the fixed sealing ring 47 in close contact (i.e., the pressure valve is closed).

[0035] The outer wall of the valve housing 42 is provided with several outlet holes (connecting the annular chamber and the return pipe 7). When the dynamic sealing ring 46 and the fixed sealing ring 47 are separated, the overpressure gasoline can enter the annular chamber through the gap between the dynamic sealing ring 46 and the fixed sealing ring 47, and flow into the return pipe 7 through the outlet holes and be discharged.

[0036] III. Work Process Example

[0037] When the gasoline filter is working normally, the gasoline pressure connected by the oil inlet pipe 5 is within the design range (for example, ≤3bar), one way of gasoline directly passes through the middle pipe 41 of the pressure valve 4, and the other way of gasoline enters the valve cavity through the perforation of the partition plate 2, then the spring 45 pushes the diaphragm 43 to compress downward, so that the dynamic sealing ring 46 and the static sealing ring 47 are tightly attached, gasoline cannot pass through the gap between the dynamic sealing ring 46 and the static sealing ring 47, and all the gasoline is filtered by the filter element 3 and then directly output from the oil outlet pipe 6 through the middle pipe 41.

[0038] When the gasoline pressure abnormally rises (for example, >3bar), the pushing force of gasoline on the diaphragm 43 exceeds the elastic force of the spring 45, the diaphragm 43 arches upward (driving the dynamic sealing ring 46 to move upward), the dynamic sealing ring 46 and the static sealing ring 47 are separated, the overpressure gasoline flows from the gap into the upper part of the diaphragm, then enters the annular chamber through the outlet hole of the valve shell 42 outer wall, and finally is led out to the low-pressure circuit of the fuel system through the return pipe 7, so as to maintain the stable pressure inside the filter.

[0039] In this process, the positioning seat 8 ensures that the bottom of the pressure valve 4 is fixed and does not deviate, the positioning insert 9 limits the radial and axial movement of the upper part of the pressure valve 4 through the elastic deformation of the rubber material and the cooperation of the positioning ring and the positioning ring groove, and the precise positioning and tight sealing of the pressure valve 4 are realized as a whole by combining the sealing effect of the rubber part, thereby avoiding the leakage and deviation problems caused by the failure of the sealing ring or multiple sealing in the traditional structure.

[0040] After adopting the above technical scheme, the following technical effects can be achieved:

[0041] 1. The positioning seat and the positioning insert realize the precise positioning of the pressure valve;

[0042] 2. The positioning insert of rubber material enhances the sealing performance;

[0043] 3. The structure of the pressure valve is optimized, and the work is stable and reliable.

Claims

1. A positive shut-off gasoline filter comprising: The shell (1) has a cavity provided with a partition plate (2), a filter core (3) is installed below the partition plate (2), and a pressure valve (4) is installed above the partition plate (2), the lower end of the shell (1) is connected with an oil inlet pipe (5), and the upper end of the shell (1) is connected with an oil outlet pipe (6) and a return pipe (7), characterized in that the oil outlet pipe (6) and the oil inlet pipe (5) are coaxially arranged, the partition plate (2) is provided with a through hole coaxial with the oil inlet pipe (5), a positioning seat (8) is installed on the through hole, the bottom of the pressure valve (4) is positioned and inserted on the positioning seat (8) through a rubber part, and the inner end of the oil outlet pipe (6) is inserted with a positioning plug (9), and the lower end of the positioning plug (9) is positioned and matched with the valve shell (42) of the pressure valve (4).

2. The sealed gasoline filter according to claim 1, wherein The pressure valve (4) comprises a middle pipe (41) and a valve shell (42) welded on the outer wall of the middle pipe (41), a diaphragm (43) is arranged in the valve shell (42), a spring positioning seat (44) and a spring (45) are arranged above the diaphragm (43), the spring positioning seat (44) is sleeved on the lower part of the spring (45), a dynamic sealing ring (46) and a fixed sealing ring (47) are arranged below the diaphragm (43), the dynamic sealing ring (46) is connected with the diaphragm (43), the fixed sealing ring (47) is connected with the bottom of the inner cavity of the valve shell (42), the dynamic sealing ring (46) is in contact and sealed with the fixed sealing ring (47) under the elastic force of the spring (45), the middle pipe (41) and the valve shell (42) have an annular positioning ring groove, the positioning plug (9) is a tubular part, an annular positioning ring is arranged on the lower part of the positioning plug (9), the positioning ring is matched with the positioning ring groove, the positioning plug (9) is sleeved on the middle pipe (41), and the lower port of the positioning plug (9) is inserted into the positioning ring groove, and the upper port of the positioning plug (9) is inserted into the inner hole of the oil outlet pipe (6).

3. The sealed gasoline filter according to claim 1, wherein The positioning seat (8) is an annular body, comprising a large pipe body (81) with a large pipe diameter at the upper part and a small pipe body (82) with a small pipe diameter at the lower part, the small pipe body (82) is inserted on the through hole of the partition plate (2) through a sealing ring, and the bottom of the pressure valve (4) is installed in the large pipe body (81); the small pipe body (82) of the positioning seat (8) is inserted into the through hole of the partition plate (2).

4. The sealed gasoline filter according to claim 1, wherein The positioning plug (9) is made of rubber.

5. The sealed gasoline filter of claim 2 wherein, An outlet hole is arranged on the outer wall of the valve shell (42), and the outlet hole is communicated with the return pipe (7). An outlet hole is arranged on the outer wall of the valve shell (42), and the outlet hole is communicated with the return pipe (7).

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