Front-end filter element of fuel oil and lubricating oil radiator

Abstract

The invention discloses a front-end filter element of a fuel oil and lubricating oil radiator, which is suitable for fuel oil and lubricating oil working environments. The front-end filter element is mainly composed of a protective shaft sleeve, an upper end cover, a first filter screen assembly, a middle end cover, a second filter screen assembly and a lower end cover, the protective shaft sleeve sequentially penetrates through the upper end cover, the first filter screen assembly, the middle end cover and the second filter screen assembly and then is tightly attached to the lower end cover, and a first spring, a fourth sealing ring, a rubber pad, a gasket and a magnetic bar are installed in the protective shaft sleeve. A stop block, a second spring and an elastic check ring for a hole are installed in the lower end cover. The first filter screen assembly and the second filter screen assembly are located at the positions of a lubricating oil channel and a fuel oil channel in the installation shell correspondingly, and each of the first filter screen assembly and the second filter screen assembly comprises two-stage filter screens with different filtering precision. The front-end filter elements of the lubricating oil way and the fuel oil way of the fuel and lubricating oil radiator are integrated, the number of maintenance points of an engine is reduced, the maintenance efficiency is improved, and meanwhile light weight is achieved.

Description

Technical Field

[0001] This invention relates to a front-end filter element for a fuel oil radiator, belonging to the field of aero-engine filter design technology. Background Technology

[0002] Currently, the development trend of maintenance components for aero engines is towards simplification, integration, and lightweighting. To improve the maintainability of engine fuel oil coolers, an improved design scheme is proposed for the front-end filter element of the fuel oil cooler. Summary of the Invention

[0003] The present invention aims to provide a front-end filter element for a fuel oil radiator, and to design an integrated, lightweight, and modular filtration structure for aero engines.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A front-end filter element for a lubricating oil radiator includes a protective bushing, an upper end cover, a first filter screen assembly, a middle end cover, a second filter screen assembly, and a lower end cover, all installed and coaxially assembled within a mounting housing. The upper end cover is fitted with the mounting housing with a clearance, and the upper end cover has a through hole in the axial direction, with at least one section of internal thread on the inner wall of the through hole; The intermediate end cap is fitted with the mounting housing with a clearance, and the intermediate end cap has a through hole in the axial direction; The lower end cover is fitted with the mounting housing with a gap. The first axial end face of the lower end cover has a blind hole, and the second axial end face has an annular groove. A stop block is slidably installed in the annular groove, and a second spring is provided between the stop block and the bottom of the annular groove. One end face of the stop block away from the second spring is in close contact with an annular protrusion in the mounting housing. An elastic retaining ring for holes is provided in the annular groove and between the groove opening and the stop block. The protective bushing passes through the through hole of the upper end cover, the first filter assembly, the through hole of the middle end cover, and the second filter assembly in sequence. The first axial end of the protective bushing is connected to the internal thread of the through hole of the upper end cover through the external thread. The second axial end of the protective bushing is placed in the blind hole of the lower end cover. The end face of the second axial end of the protective bushing has a blind hole. The first spring, the fourth sealing ring, the rubber pad, the gasket, and the magnetic rod are installed in sequence in the blind hole from the bottom of the blind hole to the opening of the blind hole. The first filter assembly is fitted with the mounting housing with a gap, and the first filter assembly is located between the lubricating oil inlet and the lubricating oil outlet inside the mounting housing. The first filter assembly includes a first frame, and the two sides of the first frame are respectively connected to a first filter and a second filter with different filtration accuracies. The second filter assembly is fitted with the mounting housing with a gap, and the second filter assembly is located between the fuel inlet and the fuel outlet inside the mounting housing. The second filter assembly includes a second frame, and a third filter and a fourth filter with different filtration accuracies are respectively connected to both sides of the second frame.

[0005] As one solution: A first sealing ring is provided between the outer surface of the upper end cover and the mounting housing; A second sealing ring is provided between the outer surface of the intermediate end cap and the mounting housing; A third sealing ring is provided between the outer surface of the lower end cover and the mounting housing.

[0006] As one solution: A fourth sealing ring is installed between the outer surface of the protective bushing and the non-threaded surface of the inner wall of the through hole of the upper end cover; A fifth sealing ring is installed between the outer surface of the protective bushing and the inner wall of the through hole of the intermediate end cover.

[0007] As one solution: the outer side of the upper cover is provided with multiple lugs, each lug having a mounting hole, and the upper cover is connected to the mounting housing through the mounting hole and the connector inside the mounting hole.

[0008] As one option: the upper end cover, middle end cover, and lower end cover are made of aluminum alloy.

[0009] As one solution: The pore size of the first filter screen is larger than that of the second filter screen, and the pore sizes of both the first and second filter screens are larger than the installation gap between the upper end cover, the middle end cover, the first frame and the mounting housing. The first filter screen is connected to the lubricating oil inlet, and the second filter screen is connected to the lubricating oil outlet. The pore size of the third filter screen is larger than that of the fourth filter screen, and the pore sizes of both the third and fourth filter screens are larger than the installation gap between the middle end cap, the second frame, the lower end cap and the mounting housing. The third filter screen is connected to the fuel inlet and the fourth filter screen is connected to the fuel outlet.

[0010] As one solution: The first skeleton surface is provided with a left gap control rib and a right gap control rib. Both the left gap control rib and the right gap control rib extend along the axial direction of the first filter assembly, and the lengths of the left gap control rib and the right gap control rib are different. The second skeleton surface is provided with a left gap control rib and a right gap control rib. Both the left gap control rib and the right gap control rib extend along the axial direction of the second filter assembly, and the lengths of the left gap control rib and the right gap control rib are different.

[0011] As one solution: The first filter assembly is glued to the upper end cover and the middle end cover at both axial ends, respectively. The two axial ends of the second filter assembly are glued to the upper end cover and the lower end cover, respectively.

[0012] As one solution: The first and second filter screens are connected to the first frame by spot welding; The third and fourth filters are connected to the second frame by spot welding.

[0013] As one option: the first axial end of the protective bushing further includes a regular hexagonal prism, and the regular hexagonal prism is located outside the mounting housing.

[0014] This invention integrates the front-end filter element of the lubricating oil circuit of the fuel oil cooler with the fuel oil circuit, thereby reducing the number of engine maintenance points and improving maintenance efficiency.

[0015] This invention achieves a 40% weight reduction by replacing the traditional stainless steel end cap with an aluminum alloy end cap.

[0016] This invention prevents pollutants larger than the filter mesh pore size from flowing into the downstream system by controlling the size of the gaps between the upper end cover, middle end cover, lower end cover, first frame, second frame and mounting housing.

[0017] The present invention avoids incorrect installation orientation of the first and second filter assemblies by using different lengths of the gap control ribs on the first and second filter assemblies.

[0018] Compared with existing technologies, this invention designs an integrated and lightweight front-end filter element for aircraft engine fuel and lubricating oil radiators. The front-end filters for both fuel and lubricating oil are integrated within a single mounting housing, reducing the number of engine maintenance points and improving maintenance efficiency. This invention uses an aluminum alloy end cap and an adhesive bonding method between the aluminum alloy end cap and the filter assembly, replacing the traditional stainless steel end cap and welding method, ultimately achieving weight reduction. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention; Figure 2 This is a full sectional view of the left side of the present invention; Figure 3 This is a front view of the first filter assembly of the present invention; Figure 4 This is a front view of the second filter assembly of the present invention; Figure 5 This is a top view of the present invention; Figure 6 This is a schematic diagram of the installation state of the present invention; Figure 7 This is a schematic diagram of the installation gap of the present invention; In the diagram: 1. Protective bushing, 2. First sealing ring, 3. Upper end cover, 4. First filter assembly, 5. Middle end cover, 6. Second sealing ring, 7. Second filter assembly, 8. Lower end cover, 9. Third sealing ring, 10. First spring, 11. Fourth sealing ring, 12. Rubber pad, 13. Gasket, 14. Magnetic rod, 15. Fifth sealing ring, 16. Second spring, 17. Stop block, 18. Elastic retaining ring for the hole, 19. First filter, 20. First frame, 21. Second filter, 22. Third filter, 23. Second frame, 24. Fourth filter. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0021] like Figures 1 to 7 As shown, this is an invention design for a front-end filter element of a lubricating oil radiator, mainly composed of a protective bushing 1, an upper end cover 3, a first filter screen assembly 4, a middle end cover 5, a second filter screen assembly 7, and a lower end cover 8 (see reference). Figure 1 See also Figure 3 and Figure 4 The first filter assembly 4 consists of a first filter 19, a first frame 20, and a second filter 21. The first filter 19 is the first-stage filter, and the second filter 21 is the second-stage filter. The filtration accuracy of the first filter 19 is lower than that of the second filter 21 (i.e., the nominal diameter of the mesh of the first filter 19 is larger than that of the second filter 21). The second filter assembly 7 has a similar structure to the first filter assembly 4. The filtration accuracy of the third filter 22 is lower than that of the fourth filter 24. The first filter 19 and the second filter 21 are fixed in the first frame 20 by spot welding, and the third filter 22 and the fourth filter 24 are fixed in the second frame 23 by spot welding.

[0022] A first sealing ring 2 is provided between the outer surface of the upper end cover 3 and the mounting housing; a second sealing ring 6 is provided between the outer surface of the middle end cover 5 and the mounting housing; a third sealing ring 9 is provided between the outer surface of the lower end cover 8 and the mounting housing; a fourth sealing ring 11 is installed between the outer surface of the protective bushing 1 and the non-threaded surface of the inner wall of the through hole of the upper end cover 3; and a fifth sealing ring 15 is installed between the outer surface of the protective bushing 1 and the inner wall of the through hole of the middle end cover 5.

[0023] The protective bushing 1 contains a magnetic rod 14, a first spring 10, a rubber pad 12, and a gasket 13. Because the magnetic rod 14 has poor ductility, the protective bushing 1 protects it from breakage during filter element operation. The first spring 10 provides axial preload to the magnetic rod 14, working together with the rubber pad 12 to protect the magnetic rod 14 under mechanical stress conditions such as vibration, impact, and acceleration.

[0024] The lower end cover 8 of the filter element contains a second spring 16, a stop block 17, and a spring retainer 18 for the orifice, forming an elastic structure. The second spring 16 is sleeved on the cylinder of the inner ring of the annular groove of the lower end cover 8. The upper end of the stop block 17 has a groove to accommodate the lower end of the second spring 16. The circumferential surface of the stop block 17 slides against the side wall of the annular groove. The lower end face of the stop block 17 is in close contact with an annular protrusion at the bottom of the groove below the fuel inlet and outlet inside the mounting housing. The annular protrusion passes through the inner hole of the spring retainer 18 for the orifice and then is in close contact with the lower end face of the stop block 17. The spring retainer 18 for the orifice restricts the sliding stroke of the stop block 17. After installation, it provides axial preload to the filter element, preventing damage to the adhesive joints of the first filter screen assembly 4, the second filter screen assembly 7, the upper end cover 3, the middle end cover 5, and the lower end cover 8 during normal operation due to mechanical stresses such as vibration, impact, and acceleration, as well as environmental stresses such as high and low temperatures. The filter element is installed as follows. Figure 5 As shown.

[0025] This invention is achieved through Figure 4 The three mounting holes on the upper end cap 3, which are not on the same diameter center circle, are positioned with the mounting housing to prevent incorrect installation of the filter element. This invention is fixed to the mounting housing by three bolts.

[0026] Unfiltered lubricating oil undergoes primary filtration via the first filter screen 19 of this invention. The magnetic rod 14 designed within the filter element adsorbs ferromagnetic impurities in the lubricating oil. After secondary filtration via the second filter screen 21, it flows into the next stage system. The filtration accuracy of the first filter screen 19 and the second filter screen 21 is determined by the requirements of the lubricating oil system, but it must ensure that their pore size is larger than the gap between the upper end cap 3, the middle end cap 5, the first frame 20, and the mounting housing. The first filter screen assembly 4 is connected to the upper end cap 3 and the middle end cap 5 via encapsulating adhesive. Figure 2 As shown, the length of the gap control rib on the left side of the first frame 20 is smaller than that on the right side. This setting can prevent the first filter screen assembly 4 from being installed in the wrong direction during the filter element assembly process.

[0027] Unfiltered fuel undergoes first-stage filtration via the third filter 22 of this invention. The magnetic rod 14 designed within the filter element adsorbs ferromagnetic impurities in the lubricating oil. After second-stage filtration via the fourth filter 24, it flows into the next stage system. The filtration accuracy of the third filter 22 and the fourth filter 24 is determined by the fuel system requirements, but their pore size must be larger than the gap between the intermediate end cap 5, the second frame 23, the lower end cap 8, and the mounting housing. The second filter assembly 7 is connected to the intermediate end cap 5 and the lower end cap 8 via encapsulating adhesive. Figure 2 As shown, the length of the gap control rib on the left side of the second frame 23 is smaller than that on the right side. This setting can prevent the second filter assembly 7 from being installed in the wrong direction during assembly.

[0028] This invention prevents pollutants larger than the filter mesh pore size from flowing into the downstream system by controlling the size of the gap between the upper end cover 3, the middle end cover 5, the lower end cover 8, the first frame 20, the second frame 23 and the mounting housing.

[0029] like Figure 1 and Figure 2 A second sealing ring 6 is provided between the outer surface of the intermediate end cover 5 and the mounting housing; a fifth sealing ring 15 is installed between the outer surface of the protective bushing 1 and the inner wall of the through hole of the intermediate end cover 5. The present invention achieves system oil and fuel isolation through the combination of the second sealing ring 6 and the fifth sealing ring 15.

[0030] Those skilled in the art can make various adjustments to this application based on the actual circumstances. The general principles defined in this application can be implemented in other embodiments without departing from their connotations. Therefore, this application is not limited to the structure shown in the specific embodiments, but is to be accorded the widest scope consistent with the principles and features set forth in the claims of this application.

Claims

1. A front-end filter element for a lubricating oil radiator, characterized in that: Includes a protective bushing (1), an upper end cover (3), a first filter assembly (4), an intermediate end cover (5), a second filter assembly (7), and a lower end cover (8) that are installed in the mounting housing and coaxially assembled. The upper end cover (3) is fitted with the mounting housing with a gap. The upper end cover (3) has a through hole in the axial direction and at least one internal thread on the inner wall of the through hole. The intermediate end cap (5) is fitted with the mounting housing with a clearance, and the intermediate end cap (5) has a through hole in the axial direction; The lower end cover (8) is fitted with the mounting housing with a gap. The first axial end face of the lower end cover (8) has a blind hole and the second axial end face has an annular groove. A stop block (17) is slidably installed in the annular groove. A second spring (16) is provided between the stop block (17) and the bottom of the annular groove. One end face of the stop block (17) away from the second spring (16) is in close contact with an annular protrusion in the mounting housing. An elastic retaining ring (18) for holes is provided in the annular groove and between the annular groove opening and the stop block (17). The protective bushing (1) passes through the through hole of the upper end cover (3), the first filter assembly (4), the through hole of the middle end cover (5), and the second filter assembly (7) in sequence. The first axial end of the protective bushing (1) is connected to the internal thread of the through hole of the upper end cover (3) through the external thread. The second axial end of the protective bushing (1) is placed in the blind hole of the lower end cover (8). The end face of the second axial end of the protective bushing (1) has a blind hole. The first spring (10), the fourth sealing ring (11), the rubber pad (12), the gasket (13), and the magnetic rod (14) are installed in sequence in the blind hole from the bottom of the blind hole to the opening of the blind hole. The first filter assembly (4) is fitted with the mounting housing with a gap, and the first filter assembly (4) is located between the lubricating oil inlet and the lubricating oil outlet in the mounting housing. The first filter assembly (4) includes a first frame (20), and the two sides of the first frame (20) are respectively connected to a first filter (19) and a second filter (20) with different filtration accuracies. The second filter assembly (7) is fitted with the mounting housing with a gap, and the second filter assembly (7) is located between the fuel inlet and the fuel outlet inside the mounting housing. The second filter assembly (7) includes a second frame (23), and the two sides of the second frame (23) are respectively connected to a third filter (22) and a fourth filter (24) with different filtration accuracies.

2. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: A first sealing ring (2) is provided between the outer surface of the upper end cover (3) and the mounting housing; A second sealing ring (6) is provided between the outer surface of the intermediate end cap (5) and the mounting housing. A third sealing ring (9) is provided between the outer surface of the lower end cover (8) and the mounting housing.

3. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: A fourth sealing ring (11) is installed between the outer surface of the protective bushing (1) and the non-threaded surface of the inner wall of the through hole of the upper end cover (3). A fifth sealing ring (15) is installed between the outer surface of the protective bushing (1) and the inner wall of the through hole of the intermediate end cover (5).

4. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The upper end cover (3) has multiple lugs on its outer side, and each lug has a mounting hole. The upper end cover (3) is connected to the mounting housing through the mounting hole and the connector inside the mounting hole.

5. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The upper end cover (3), middle end cover (5) and lower end cover (8) are made of aluminum alloy.

6. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The filter aperture of the first filter screen (19) is larger than that of the second filter screen (20), and the filter apertures of the first filter screen (19) and the second filter screen (20) are both larger than the installation gap between the upper end cover (3), the middle end cover (5), the first frame (20) and the mounting housing. The first filter screen (19) is connected to the lubricating oil inlet, and the second filter screen (20) is connected to the lubricating oil outlet. The filter aperture of the third filter (22) is larger than that of the fourth filter (24), and the filter apertures of the third filter (22) and the fourth filter (24) are both larger than the installation gap between the middle end cap (5), the second frame (23), the lower end cap (8) and the mounting housing. The third filter (22) is connected to the fuel inlet, and the fourth filter (24) is connected to the fuel outlet.

7. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The surface of the first skeleton (20) is provided with a left gap control rib and a right gap control rib. Both the left gap control rib and the right gap control rib extend along the axial direction of the first filter assembly (4), and the lengths of the left gap control rib and the right gap control rib are different. The second skeleton (23) has a left gap control rib and a right gap control rib on its surface. The left gap control rib and the right gap control rib extend along the axis of the second filter assembly (7), and the left gap control rib and the right gap control rib have different lengths.

8. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The first filter assembly (4) is glued to the upper end cover (3) and the middle end cover (5) at both axial ends respectively; The two ends of the second filter assembly (7) are glued to the upper end cover (3) and the lower end cover (8) respectively.

9. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The first filter screen (19) and the second filter screen (20) are connected to the first frame (20) by spot welding; The third filter (22) and the fourth filter (24) are connected to the second frame (23) by spot welding.

10. The front-end filter element of a lubricating oil radiator according to claim 1, characterized in that: The first axial end of the protective bushing (1) also includes a regular hexagonal prism, and the regular hexagonal prism is located outside the mounting housing.

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