Fuel pressure regulator

Abstract

The fuel pressure regulator comprises an upper shell, a lower shell, an oil inlet pipe, an oil return pipe, a valve body, a diaphragm, a spring and a lower supporting plate, an air connecting opening is formed in the end portion of the upper shell, the spring and the lower supporting plate are arranged in the upper shell, an upper supporting plate opposite to the lower supporting plate is arranged in the upper shell, a supporting piece is fixedly connected in the air connecting opening, and the supporting piece is fixedly connected with the diaphragm. An adjusting screw is rotatably arranged on the supporting piece, the upper supporting plate is connected to the adjusting screw in a threaded mode and matched with the lower supporting plate to press the spring, a plurality of guide protrusions extending longitudinally are formed on the inner wall of the upper shell, a plurality of guide grooves matched with the guide protrusions are formed in the circumferential side face of the upper supporting plate, and the guide protrusions are kept in the guide grooves. A plurality of first vent holes and a plurality of second vent holes are formed in the supporting piece and the upper supporting plate respectively. The fuel pressure regulator can adapt to different engines by adjusting the pre-tightening force of the spring, and has better applicability, better overall sealing performance and higher adjusting precision.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile accessories, in particular to a fuel pressure regulator. Background Art

[0002] The fuel regulator, a key component in an automotive fuel system, primarily consists of a housing, spring, diaphragm, and valve. Its operating principle is to balance oil pressure based on changes in intake manifold pressure through the coordinated action of the spring and the air chamber vacuum, maintaining fuel pressure within a normal range. Prior art efforts have sought to enhance the applicability of fuel pressure regulators to engines with varying fuel delivery pressures. For example, the utility model patent "A Pressure Valve with a Wide Scope of Application" (Publication No. CN217463360U) discloses a fuel pressure regulator that can adjust the spring preload to accommodate different engine fuel delivery pressures. However, in this fuel pressure regulator, the spring preload is adjusted by a locating member threaded onto the housing, which drives the movement of a locating member within the housing. To ensure the airtightness of the air chamber, high sealing requirements are imposed on the locating member and the housing. However, this sealing is limited by the machining precision of the threaded connection. This can affect the sealing between the locating member and the housing during production or assembly, compromising the airtightness of the air chamber and, consequently, the accuracy of the fuel pressure regulator's oil pressure regulation.

[0003] In view of the above problems, the present invention makes improvements. Utility Model Content

[0004] The utility model provides a fuel pressure regulator, which solves the above problems existing in the prior art during use.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] A fuel pressure regulator comprises an upper shell, a lower shell, an oil inlet pipe, an oil return pipe, a valve body, a diaphragm, a spring and a lower support plate, an air inlet is formed at the end of the upper shell, the spring and the lower support plate are arranged in the upper shell, an upper support plate opposite to the lower support plate is arranged in the upper shell, a support member is fixedly connected in the air inlet, an adjusting screw is rotatably arranged on the support member, the upper support plate is screwed on the adjusting screw and cooperates with the lower support plate to compress the spring, a plurality of longitudinally extending guide protrusions are formed on the inner wall of the upper shell, a plurality of guide grooves matching the guide protrusions are provided on the peripheral side surface of the upper support plate, the guide protrusions are retained in the guide grooves, and a plurality of first vent holes and a plurality of second vent holes are respectively provided on the support member and the upper support plate.

[0007] Preferably, the support member is in the shape of a cylinder with a U-shaped cross-section, a connecting portion surrounding the air inlet is formed at the upper end of the upper shell, an abutting portion is formed at the upper end of the support member and the support member is inserted into the interface so that the abutting portion abuts against the connecting portion, and the connecting portion is bent to cover the abutting portion and then welded to the abutting portion.

[0008] Preferably, a first sealing gasket is provided between the abutting portion and the connecting portion.

[0009] Preferably, a rotation hole is opened at the lower end of the support member, and a first limiting ring is formed on the peripheral side of the adjusting screw. The adjusting screw passes upward through the rotation hole so that the first limiting ring abuts against the support member.

[0010] Preferably, a hexagonal transmission portion is formed at the upper end of the adjusting screw.

[0011] Preferably, a threaded portion surrounding the adjusting screw is formed at the center of the upper support plate, and the adjusting screw is threaded in the threaded portion.

[0012] Preferably, an air pipe is connected to the support member.

[0013] Preferably, a second limiting ring is formed on the peripheral side surface of the air connecting pipe, and the air connecting pipe is screwed into the supporting component so that the second limiting ring abuts against the abutting portion.

[0014] Preferably, a second sealing gasket is provided between the second limiting ring and the abutting portion.

[0015] To sum up, the beneficial effect of the present invention is that by rotating the adjusting screw, the upper support plate, which is rotationally limited by the cooperation of the guide protrusion and the guide groove, can be moved relative to the lower support plate in the upper shell body, thereby adjusting the preload force of the spring, so that the fuel pressure regulator can adapt to engines with different fuel pressure setting values, and has better applicability. Moreover, since the movement of the adjusting screw and the upper support plate occurs inside the air chamber formed by the upper shell body, it will not affect the sealing of the air chamber, thereby ensuring the accuracy of the fuel pressure regulator in adjusting the fuel pressure in the oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0019] Figure 3 This is an exploded schematic diagram of the utility model;

[0020] Figure 4 This is a schematic structural diagram of the upper housing in the utility model;

[0021] Figure 5 This is a structural diagram of the upper spring supporting plate in the present invention;

[0022] Figure 6 Schematic diagram of the structure of the support and the adjusting screw.

[0023] In the figure: 1. Upper shell; 2. Lower shell; 3. Oil inlet pipe; 4. Oil return pipe; 5. Valve body; 6. Diaphragm; 7. Spring; 8. Lower support plate; 9. Upper support plate; 10. Adjusting screw; 11. Air connection port; 12. Support member; 13. Guide protrusion; 14. Guide groove; 15. First air vent; 16. Second air vent; 17. Connecting part; 18. Abutting part; 19. First sealing gasket; 20. Rotating hole; 21. First limiting ring; 22. Transmission part; 24. Threaded part; 25. Air connection pipe; 26. Second limiting ring; 27. Second sealing gasket. DETAILED DESCRIPTION

[0024] The following is a combination of the appended examples of the present invention Figure 1-6 , clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] As shown in the figure, a fuel pressure regulator includes an upper shell 1, a lower shell 2, an oil inlet pipe 3, an oil return pipe 4, a valve body 5, a diaphragm 6, a spring 7 and a lower support plate 8. The upper shell 1 and the lower shell 2 are fixedly connected to clamp the diaphragm 6 between the upper shell 1 and the lower shell 2. The lower support plate 8 and the valve body 5 are respectively arranged on the upper and lower sides of the diaphragm 6. The oil inlet pipe 3 and the oil return pipe 4 are fixedly connected to the lower shell 2 and communicate with the lower shell 2. The port of the oil return pipe 4 abuts against the valve body 5. An air inlet 11 is formed at the end of the upper shell 1. The spring 7 and the lower support plate 8 are arranged in the upper shell 1. The upper shell 1 is provided with a spring 7 and a spring 8 that is connected to the lower support plate 8. Regarding the upper support plate 9, a support member 12 is fixedly connected to the air inlet 11, and an adjusting screw 10 is rotatably provided on the support member 12. The upper end of the adjusting screw 10 passes through the support member 12, and the upper support plate 9 is screwed onto the adjusting screw 10 and cooperates with the lower support plate 8 to tighten the spring 7. A plurality of longitudinally extending guide protrusions 13 are formed on the inner wall of the upper shell 1, and a plurality of guide grooves 14 matching the guide protrusions 13 are provided on the side surfaces of the upper support plate 9. The guide protrusions 13 are retained in the guide grooves 14, and a plurality of first air vents 15 and a plurality of second air vents 16 are respectively provided on the support member 12 and the upper support plate 9.

[0026] Specifically, the support member 12 is fixedly connected to the structure inside the air inlet 11: the support member 12 is a cylindrical shape with a U-shaped cross-section, and a connecting portion 17 surrounding the air inlet 11 is formed at the upper end of the upper shell 1, and an abutting portion 18 is formed at the upper end of the support member 12 and the support member 12 is inserted into the interface so that the abutting portion 18 abuts against the connecting portion 17, and the connecting portion 17 is bent to cover the abutting portion 18 and then welded to the abutting portion 18.

[0027] Specifically, the adjusting screw 10 is rotatably arranged on the support member 12: a rotating hole 20 is opened at the lower end of the support member 12, and a first limiting ring 21 is formed on the side surface of the adjusting screw 10. The adjusting screw 10 passes upward through the rotating hole 20 so that the first limiting ring 21 is against the support member 12. The force applied by the spring 7 to the upper support plate 9 and then to the adjusting screw 10 enables the first limiting ring 21 to be tightly against the lower end surface of the support member 12, thereby ensuring the stability of the adjusting screw 10 during rotation.

[0028] In the above embodiment, the air inlet 11 is used to be connected to the intake manifold through a hose, and the interior of the upper housing 1 is connected to the intake manifold through the first air vent 15 and the second air vent 16. The oil inlet pipe 3 and the oil return pipe 4 are connected to the distribution pipe and the fuel tank respectively. When the fuel pressure regulator is not working, the preload force generated by the compressed spring 7 presses against the valve body 5 so that it presses against the end of the oil return pipe 4 and closes the end of the oil return pipe 4. When the fuel pressure regulator is working, a pressure difference is generated between the air chamber formed inside the upper housing 1 and the oil chamber formed inside the lower housing 2, which are separated by the diaphragm 6. The spring 7 is pushed and compressed by the valve body 5 and the lower support plate 8, so that the valve body 5 moves away from the position where it presses against the end of the oil return pipe 4. A channel for oil to pass through is formed between the oil return pipe 4 and the valve body 5. The oil in the oil chamber passes through the channel and enters the oil return pipe 4 and flows back to the fuel tank, thereby adjusting the fuel pressure in the oil circuit and maintaining it within a normal range. When the preload force of the spring 7 needs to be adjusted to suit engines with different fuel pressure setting values, the adjusting screw 10 is rotated by passing the adjusting screw 10 through the end of the support 12. At the same time, the circumferential rotation of the upper support plate 9 relative to the upper shell 1 is limited by the cooperation of the guide protrusion 13 and the guide groove 14, so that the upper support plate 9 moves relative to the lower support plate 8 in the upper shell 1 when the adjusting screw 10 is rotated, thereby adjusting the distance between the upper support plate 9 and the lower support plate 8, and then adjusting the compression amount of the spring 7, thereby achieving the purpose of adjusting the preload force of the spring 7. During the process, since the movements generated by the adjusting screw 10 and the upper support plate 9 are all carried out in the air chamber formed inside the upper shell 1, it is only necessary to seal the fixed connection between the support member 12 and the upper shell 1. In this embodiment, a good seal is formed between the support member 12 and the upper shell 1 by covering the connecting portion 17 and welding it to the abutment portion 18, thereby ensuring that the adjustment of the preload force of the spring 7 will not affect the air tightness of the air chamber, making this fuel filter more applicable while ensuring the accuracy of adjusting the fuel pressure in the oil circuit, and the processing and assembly of the fixed connection between the support member 12 and the upper shell 1 are easy to operate.

[0029] In addition, a first sealing gasket 19 is provided between the abutting portion 18 and the connecting portion 17 . The first sealing gasket strengthens the sealing between the supporting member 12 and the upper shell 1 , thereby strengthening the airtightness of the air chamber.

[0030] In addition, the upper end of the adjusting screw 10 passes through the support member 12 to form a hexagonal transmission part 22. When the preload force of the spring 7 is adjusted by rotating the adjusting screw 10, the adjusting screw 10 can be rotated by sleeved on the transmission part 22 through the hexagonal socket, thereby facilitating the operation of adjusting the preload force of the spring 7.

[0031] In addition, a threaded portion 24 surrounding the adjusting screw 10 is formed in the center of the upper support plate 9, and the adjusting screw 10 is threaded in the threaded portion 24. The threaded portion 24 increases the area of the threaded connection between the adjusting screw 10 and the upper support plate 9, thereby strengthening the supporting force of the adjusting screw 10 on the upper support plate 9 and ensuring the stability of the spring 7 when adjusting the fuel pressure in the oil circuit.

[0032] In addition, an air connecting pipe 25 is connected to the support member 12, and the hose connected to the intake manifold is plugged into the intake pipe, and the air inlet 11 is connected to the intake manifold. In addition, a second limiting ring 26 is formed on the side surface of the air connecting pipe 25. The air connecting pipe 25 is screwed into the support member 12 so that the second limiting ring 26 abuts against the abutting portion 18. The screw connection between the air connecting pipe 25 and the support member 12 allows the air connecting pipe 25 to be easily disassembled and assembled. When the preload force of the spring 7 needs to be adjusted, the air connecting pipe 25 can be easily removed to operate the adjusting screw 10 to adjust the preload force of the spring 7.

[0033] In addition, a second sealing gasket 27 is provided between the second limiting ring 26 and the abutting portion 18 . The second sealing gasket 27 strengthens the sealing between the air connection pipe 25 and the support member 12 , thereby strengthening the sealing of the air chamber.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fuel pressure regulator, comprising an upper housing (1), a lower housing (2), an oil inlet pipe (3), an oil return pipe (4), a valve body (5), a diaphragm (6), a spring (7) and a lower support plate (8), wherein an air inlet (11) is formed at an end of the upper housing (1), and the spring (7) and the lower support plate (8) are arranged in the upper housing (1), characterized in that: An upper support plate (9) opposite to the lower support plate (8) is provided in the upper shell (1), a support member (12) is fixedly connected in the air inlet (11), an adjusting screw (10) is rotatably provided on the support member (12), the upper support plate (9) is screwed onto the adjusting screw (10) and cooperates with the lower support plate (8) to tighten the spring (7), a plurality of longitudinally extending guide protrusions (13) are formed on the inner wall of the upper shell (1), a plurality of guide grooves (14) matching the guide protrusions (13) are provided on the peripheral side surface of the upper support plate (9), the guide protrusions (13) are retained in the guide grooves (14), and a plurality of first vent holes (15) and a plurality of second vent holes (16) are respectively provided on the support member (12) and the upper support plate (9).

2. The fuel pressure regulator according to claim 1, characterized in that: The support member (12) is cylindrical with a U-shaped cross section, and a connecting portion (17) surrounding the air inlet (11) is formed at the upper end of the upper shell (1). An abutting portion (18) is formed at the upper end of the support member (12), and the support member (12) is inserted into the interface so that the abutting portion (18) abuts against the connecting portion (17). The connecting portion (17) is bent to cover the abutting portion (18) and then welded to the abutting portion (18).

3. The fuel pressure regulator according to claim 2, characterized in that: A first sealing gasket (19) is provided between the abutting portion (18) and the connecting portion (17).

4. The fuel pressure regulator according to claim 2, characterized in that: A rotation hole (20) is formed at the lower end of the support member (12), and a first limiting ring (21) is formed on the peripheral side of the adjusting screw (10). The adjusting screw (10) passes upward through the rotation hole (20) so that the first limiting ring (21) abuts against the support member (12).

5. The fuel pressure regulator according to claim 4, characterized in that: A hexagonal transmission portion (22) is formed at the upper end of the adjusting screw (10).

6. The fuel pressure regulator according to claim 5, characterized in that: A threaded portion (24) surrounding the adjusting screw (10) is formed at the center of the upper support plate (9), and the adjusting screw (10) is threaded into the threaded portion (24).

7. The fuel pressure regulator according to claim 6, characterized in that: An air connection pipe (25) is connected inside the support member (12).

8. The fuel pressure regulator according to claim 7, characterized in that: A second limiting ring (26) is formed on the peripheral side of the air connection pipe (25), and the air connection pipe (25) is screwed into the support member (12) so that the second limiting ring (26) abuts against the abutting portion (18).

9. The fuel pressure regulator according to claim 8, characterized in that: A second sealing gasket (27) is provided between the second limiting ring (26) and the abutting portion (18).

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