Filter element with high ferromagnetic impurity filtering performance

Abstract

The present invention discloses a filter element with high ferromagnetic impurity filtering performance, which is suitable for a medium working environment polluted by high ferromagnetic impurities, and specifically comprises a shell component, a magnetic steel component, a spring and a base. The shell component comprises a filter screen and a lower cover, one axial end of the filter screen is connected to the lower cover, and a continuous and closed first contact sealing surface or sealing line is arranged on the inner wall of the lower cover; the magnetic steel component is movably inserted into the filter screen and the lower cover along the axial direction of the shell component, and the magnetic steel component comprises a magnetic steel and a magnetic steel mounting seat, and a continuous and closed second contact sealing surface or sealing line is arranged on the magnetic steel mounting seat, and a filter element valve seal is formed when the second contact sealing surface or sealing line is close to the first contact sealing surface or sealing line; the spring is installed inside the lower cover and between the base and the magnetic steel mounting seat. The present invention can efficiently filter ferromagnetic impurities in fuel and lubricating oil, and has the ability to temporarily store and accommodate ferromagnetic impurities. When the filter element is blocked, the filter element can also have a bypass function.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel and lubricating oil systems of aircraft engines, and in particular is a ferromagnetic dirt filtering element suitable for fuel and lubricating oil systems. Background Art

[0002] According to the requirements of my country's engine fuel and lubricating oil system, it is necessary to use the specified polluted working medium normally. However, conventional filter elements are not specially designed for ferromagnetic pollutants. Taking the engine fuel system as an example, the engine should be able to start and work when using the polluted fuel specified in Table 1. It can be seen from Table 1 that the ferromagnetic pollution content accounts for more than 50% of the pollutant types. In order to improve the filtering performance of the system filter element for ferromagnetic pollutants, the design of the present invention is now proposed.

[0003] Table 1 Fuel contamination

[0004]

[0005] Summary of the invention

[0006] In view of the above needs, the present invention aims to provide a filter element with high ferromagnetic impurity filtering performance, which can efficiently filter ferromagnetic impurities in fuel and lubricating oil, and has the ability to temporarily store and accommodate ferromagnetic impurities. In particular, when the filter element is blocked, the filter element can also have a bypass function.

[0007] The present invention is achieved through the following technical solutions:

[0008] Filter elements with high ferromagnetic impurity filtering performance, including,

[0009] A housing assembly, the housing assembly comprising a filter screen made of non-ferromagnetic material and a lower cover made of non-ferromagnetic material, one axial end of the filter screen is connected to the lower cover, a continuous and closed first contact sealing surface or sealing line is provided on the inner wall of the lower cover, and a medium outlet is also provided on the lower cover;

[0010] A magnetic steel assembly, wherein the magnetic steel assembly is movably inserted into the filter screen and the lower cover along the axial direction of the housing assembly, and the magnetic steel assembly includes a magnetic steel made of ferromagnetic material and a magnetic steel mounting seat made of non-ferromagnetic material, one end of the magnetic steel is connected to the magnetic steel mounting seat, a continuous and closed second contact sealing surface or sealing line is provided on the magnetic steel mounting seat, and the magnetic steel is located in a closed area of ​​the second contact sealing surface or sealing line, and when the second contact sealing surface or sealing line is in close contact with the first contact sealing surface or sealing line, the two form a filter element valve seal;

[0011] A base, the base being installed inside the lower cover on a side away from the magnetic steel;

[0012] The spring is installed inside the lower cover and between the base and the magnetic steel mounting seat, and the two ends of the spring are respectively close to the magnetic steel mounting seat and the base.

[0013] It should be noted that the filter element valve seal has the following forms, namely, a combination of the first contact sealing surface and the second contact sealing surface, a combination of the first contact sealing surface and the second contact sealing line, and a combination of the first contact sealing line and the second contact sealing surface.

[0014] Furthermore, the magnetic steel has a variable cross-section structure, and the cross-section gradually increases from the end where the magnetic steel is connected to the magnetic steel mounting seat to the free end of the magnetic steel.

[0015] Furthermore, a through hole is formed on the magnetic steel, and the axis of the through hole is perpendicular to the axis of the magnetic steel.

[0016] Furthermore, an impurity storage groove is formed on the end surface of the magnetic steel mounting seat connected to the magnetic steel, and the impurity storage groove is located in the second contact sealing surface or line area.

[0017] Furthermore, the filter element with high ferromagnetic impurity filtering performance also includes an upper cover made of non-ferromagnetic material, which is installed at the other end of the filter screen in the axial direction and has a medium inlet.

[0018] Furthermore, the filter element with high ferromagnetic impurity filtering performance also includes a sealing gasket, which is installed on the inner wall of the lower cover to form a first contact sealing surface.

[0019] Furthermore, the base is fixed inside the lower cover by an elastic retaining ring through the hole.

[0020] As an option, the magnet is connected to a threaded hole on a magnet mounting seat via an external thread at one end.

[0021] As an option, a medium outlet is opened on the circumferential surface of the lower cover.

[0022] As an option, a spring positioning protrusion is provided on the base, a spring mounting groove is provided on the magnetic steel mounting seat, and the magnet, magnetic steel mounting seat, spring, base, lower cover and filter are coaxial.

[0023] As an option, a notch is also provided on the magnetic steel mounting seat, and when the filter element bypass valve is opened, the notch is used to increase the flow area of ​​the working medium and reduce the flow resistance of the filter element.

[0024] Compared with the prior art, the filter element with high ferromagnetic impurity filtering performance of the present invention has the following advantages:

[0025] (1) The magnet has a variable cross-section structure, and the cross-sectional area of ​​the magnet corresponding to the filter element medium inlet end is larger than the cross-sectional area of ​​the magnet corresponding to the connection end with the magnet mounting seat, forming an umbrella-shaped shielding protection structure similar to an open umbrella, preventing the high-speed inflow of the medium from flushing the impurities already adsorbed on the magnet out of the magnetic adsorption range of the magnet;

[0026] (2) There are multiple through holes on the magnetic steel to increase the adsorption area of ​​the magnetic steel and facilitate the later cleaning of ferromagnetic impurities adsorbed on the magnetic steel;

[0027] (3) An impurity storage tank is provided on the magnetic steel mounting seat to store ferromagnetic impurities moved by the medium;

[0028] (4) The filter element valve seal is formed by the sealing structure set on the magnetic steel mounting seat and the lower cover, and the opening and closing pressure of the valve is controlled by the spring. When the filter is blocked and the pressure is too high, the filter element valve seal opens and the medium flows out directly from the medium outlet on the lower cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view cross-sectional view of the present invention;

[0030] Figure 2 is a cross-sectional view of a housing assembly of the present invention;

[0031] Figure 3 is a cross-sectional view of a magnetic steel assembly of the present invention;

[0032] Figure 4 is a top view of the magnetic steel assembly of the present invention;

[0033] In the figure: 1-shell assembly, 2-magnetic steel assembly, 3-spring, 4-base, 5-elastic retaining ring for hole, 6-upper cover, 7-filter screen, 8-sealing gasket, 9-lower cover, 10-magnetic steel, 11-magnetic steel mounting seat. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0035] like Figure 1 to Figure 4 As shown, in this embodiment, the filter element with high ferromagnetic impurity filtering performance is mainly composed of a shell component 1, a magnetic steel component 2, a spring 3, a base 4 and an elastic retaining ring 5 for the hole.

[0036] like Figure 1 and Figure 2The housing assembly 1 is composed of an upper cover 6, a filter screen 7, a lower cover 9, and a sealing gasket 8, wherein the upper cover 6, the filter screen 7, and the lower cover 9 are connected by welding, and the upper cover 6 and the lower cover 9 clamp the filter screen 7 between them. The upper cover 6 is provided with a medium inlet, and the circumferential surface of the lower cover 9 is provided with a medium outlet. The sealing gasket 8 is vulcanized in a groove on the inner wall of the lower cover 9. The upper cover 6, the filter screen 7, and the lower cover 9 are all made of non-ferromagnetic materials.

[0037] like Figure 3 and Figure 4 The magnetic steel assembly 2 is composed of a magnetic steel 10 and a magnetic steel mounting seat 11, and one end of the magnetic steel 10 is installed in the magnetic steel mounting seat 11 through a threaded connection. The magnetic steel 10 is made of ferromagnetic material, and the magnetic steel mounting seat 11 needs to be made of non-ferromagnetic material. The magnetic steel 10 uses an inverted T-shaped structure, and the cross-section of one end corresponding to the upper cover 6 is larger, and the cross-section of the end threadedly connected to the magnetic steel mounting seat 11 is smaller. The above-mentioned variable cross-section structure prevents the high-speed flowing working medium from flushing the ferromagnetic impurities adsorbed in the magnetic steel out of the magnetic adsorption range of the magnetic steel. The magnetic steel 10 is provided with a plurality of through holes perpendicular to the axis of the magnetic steel 10, which can increase the adsorption area of ​​the magnetic steel and facilitate the subsequent cleaning of the adsorbed ferromagnetic impurities through the through holes. A U-shaped cross-section annular groove structure is designed on the end surface where the magnetic steel mounting seat 11 is connected to the magnetic steel 10, which is used to store ferromagnetic impurities moved by the medium.

[0038] like Figure 1 There is a circle of annular protrusions on the end surface where the magnetic steel mounting seat 11 is connected to the magnetic steel 10. The end of the annular protrusion serves as one of the structures for forming the valve sealing surface or line. In this embodiment, the end cross-section of the annular protrusion is conical, and an annular sealing line is formed at the vertex of the conical cross-section. When the annular sealing line contacts the annular sealing gasket 8 forming the sealing surface, a valve sealing structure is formed.

[0039] like Figure 2 , the upper end of the spring 3 is inserted into the mounting groove of the lower end surface of the magnetic steel mounting seat 11, and the lower end of the spring 3 is sleeved on the spring mounting protrusion of the base 4. After the magnetic steel assembly 2 is installed in the housing assembly 1, the magnetic steel assembly 2 can be used as a valve core to form a bypass valve structure under the cooperation of the spring 3, the base 4, and the elastic retaining ring 5 for the hole. When the filter screen 7 is blocked, the product working medium can flow into the lower system through the bypass valve.

[0040] The filter element with high ferromagnetic impurity filtering performance of the present invention has high ferromagnetic impurity filtering performance, has the ability to temporarily store and contain ferromagnetic impurities, and has the ability to bypass.

[0041] like Figure 1 , the unfiltered working medium consists of Figure 1The medium inlet above the middle upper cover 6 flows into the inner cavity of the filter screen 7 of the shell component 1. The ferromagnetic impurities in the working medium are adsorbed by the magnetic steel component 2 and then filtered through the filter screen 7 in the shell component 1 before flowing into the lower system. When the filter screen 7 in the shell component 1 is blocked, the magnetic steel component 2 moves downward under the pressure difference between the front and rear working media, and the bypass valve in the lower cover 9 opens. The working medium directly flows into the lower system after the ferromagnetic impurities are adsorbed by the magnetic steel component 2. Figure 4 The magnetic steel mounting seat 11 is also provided with three arc-shaped slots. When the bypass valve is opened, the three arc-shaped slots serve as partial flow channels for the working medium, thereby reducing the flow resistance of the working medium.

[0042] The above embodiments are not intended to limit the protection scope of the present invention. Any deformation, modification or equivalent substitution made on the basis of the technical solution of the present invention shall fall within the protection scope of the present invention.

Claims

1. A filter element with high ferromagnetic impurity filtering performance, characterized by: include, A housing assembly (1), the housing assembly (1) comprising a filter screen (7) made of a non-ferromagnetic material and a lower cover (9) made of a non-ferromagnetic material, one axial end of the filter screen (7) being connected to the lower cover (9), a continuous and closed first contact sealing surface or sealing line being provided on the inner wall of the lower cover (9), and a medium outlet being provided on the lower cover (9); A magnetic steel component (2), wherein the magnetic steel component (2) is movably inserted into the filter screen (7) and the lower cover (9) along the axial direction of the housing component (1), the magnetic steel component (2) comprises a magnetic steel (10) made of ferromagnetic material and a magnetic steel mounting seat (11) made of non-ferromagnetic material, one end of the magnetic steel (10) is connected to the magnetic steel mounting seat (11), a continuous and closed second contact sealing surface or sealing line is provided on the magnetic steel mounting seat (11), and the magnetic steel (10) is located in a closed area of ​​the second contact sealing surface or sealing line, and when the second contact sealing surface or sealing line is in close contact with the first contact sealing surface or sealing line, the two form a filter element valve seal; A base (4), the base (4) being mounted on a side of the lower cover (9) away from the magnetic steel (10); A spring (3), wherein the spring (3) is installed inside the lower cover (9) and between the base (4) and the magnetic steel mounting seat (11), and two ends of the spring (3) are respectively in close contact with the magnetic steel mounting seat (11) and the base (4).

2. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: The magnetic steel (10) is a variable cross-section structure, and the cross-section gradually increases from the end where the magnetic steel (10) is connected to the magnetic steel mounting seat (11) to the free end of the magnetic steel (10).

3. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: The magnetic steel (10) is provided with a through hole, and the axis of the through hole is perpendicular to the axis of the magnetic steel (10).

4. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: An impurity storage groove is formed on the end surface of the magnetic steel mounting seat (11) connected to the magnetic steel (10), and the impurity storage groove is located in the second contact sealing surface or line area.

5. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: It also comprises an upper cover (6) made of non-ferromagnetic material, the upper cover (6) being installed at the other axial end of the filter screen (7), and a medium inlet is provided on the upper cover (6).

6. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: It also includes a sealing gasket (8), which is installed on the inner wall of the lower cover (9) to form a first contact sealing surface.

7. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: The base (4) is fixed inside the lower cover (9) through a hole using an elastic retaining ring.

8. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: The magnetic steel (10) is connected to a threaded hole on a magnetic steel mounting seat (11) via an external thread at one end.

9. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: A medium outlet is provided on the circumferential surface of the lower cover (9).

10. The filter element with high ferromagnetic impurity filtering performance according to claim 1, characterized in that: The base (1) is provided with a spring positioning protrusion, the magnetic steel mounting seat (11) is provided with a spring mounting groove, and the magnetic steel (10), the magnetic steel mounting seat (11), the spring (3), the base (4), the lower cover (9) and the filter screen (7) are coaxial.

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