Self-adaptive movable compensation flap valve

Abstract

The utility model belongs to the technical field of aircraft fuel systems, and particularly relates to a self-adaptive movable compensation flap valve. The flap valve comprises a valve seat, a torsion spring, a pin shaft, a valve arm, a self-locking nut, a screw, a convex gasket, a pressing adhesive and a valve plate, and is a flap valve which has activity amount and can perform position and angle compensation in a self-adaptive manner.

Description

Technical Field

[0001] The utility model belongs to the technical field of aircraft fuel systems, and in particular relates to a flap valve with adaptive activity compensation. Background Art

[0002] Flap valves are widely used in aircraft fuel systems. They have the advantages of simple and reliable structure, low flow resistance and large opening diameter. Flap valves rely on the valve plate plane parallel to the compression and sealing effect. Traditional flap valves can only rotate around a fixed axis. Due to the influence of processing errors, the valve plate plane and the sealing cannot be completely parallel. There is a certain angle deviation between the valve plate and the sealing surface, resulting in a certain amount of leakage even if the sealing and valve plate are flat. Utility Model Content

[0003] The utility model adopts a flap valve with adaptive movable compensation. The valve plate can rotate and move within a certain range around a fixed fulcrum. The flap valve structure can be automatically adjusted. The valve plate can freely move or rotate within a certain gap range to compensate for the deflection caused by the processing error between the glue pressing plane and the valve plate plane, thereby ensuring the sealing of the valve.

[0004] The technical solution of this utility model:

[0005] A flap valve with adaptive activity compensation, the flap valve comprising: a valve seat 1, a torsion spring 2, a pin 3, a valve arm 4, a self-locking nut 5, a screw 6, a convex washer 7, a glue 8, and a valve plate 9;

[0006] The valve seat 1 includes a support arm 1-1, a rubber pressing groove 1-2, a torsion spring limiting hole 1-3 is opened on the base, rubber ring grooves 1-4 are opened on the upper and lower surfaces of the valve seat 1, and a first pin shaft mounting hole 1-5 is opened on the support arm 1-1;

[0007] The torsion spring support foot 2-2 of the torsion spring 2 is fixed in the torsion spring limiting hole 1-3, and the torsion spring arm 2-1 at the other end is pressed on the valve arm 4;

[0008] The pin shaft 3 passes through the spring coil 2-3 of the torsion spring 2 and is interference fixed in the first pin shaft mounting hole 1-5 of the support arm of the valve seat 1;

[0009] The valve arm 4 includes a pressure plate 4-1 and a rotary arm 4-2. The pressure plate 4-1 is provided with a first valve mounting hole 4-3, and the rotary arm 4-2 is provided with a second pin shaft mounting hole 4-4.

[0010] The screw 6 passes through the valve arm 4, the convex washer 7 and the valve plate 9, and the end of the screw 6 is fastened and locked by the self-locking nut 5;

[0011] The convex washer 7 is divided into a large end 7-1 and a small end 7-2. The small end 7-2 is inserted into the first valve mounting hole 4-3 of the valve arm 4, and a clearance fit is maintained in the radial direction. The end surface of the large end 7-1 is pressed by the self-locking nut 5, and a clearance fit is maintained between the large end and the valve arm 4 in the axial direction. The self-locking nut 5 is pressed on the plane of the large end 7-1 of the convex washer 7;

[0012] The glue 8 is pressed onto the glue groove 1-2 of the valve seat 1 through a vulcanization process, and the top of the glue 8 is a pointed ring.

[0013] The valve plate 9 comprises a second valve mounting hole 9-1, a sealing ring surface 9-2 and a retaining groove 9-3. The sealing ring surface 9-2 presses the top of the pressing glue 8 to play a sealing role.

[0014] Furthermore,

[0015] The valve arm 4 is mounted on the pin shaft 3 through the second pin shaft mounting hole 4 - 4 . The valve arm 4 can rotate around the pin shaft 3 . The pressure plate 4 - 1 of the valve arm 4 is pressed on the valve plate 9 .

[0016] Furthermore,

[0017] In the radial clearance-maintaining fit, the clearance is set within the range of 0.1 mm to 1.0 mm.

[0018] Furthermore,

[0019] A clearance fit is maintained between the axial directions, and the clearance is set in the range of 0.1mm-1.5mm.

[0020] Furthermore,

[0021] Screw 6 is a hexagonal head screw, and the screw rod of screw 6 passes through the second valve mounting hole 9-1 of the valve plate 9. The hexagonal head of screw 6 falls into the stop groove 9-3 of the valve plate 9. The stop groove 9-3 is hexagonal and has a larger area than the hexagonal head of screw 6 to act as a limit to prevent the screw from rotating.

[0022] Furthermore,

[0023] The sealing ring surface 9 - 2 of the valve plate 9 is pressed on the pressure glue 8 , and the sealing ring surface 9 - 2 presses the top of the pressure glue 8 to isolate the fuel on both sides of the valve plate 9 .

[0024] Furthermore,

[0025] When the fuel pressure below the valve plate 9 is greater than the fuel pressure above the valve plate 9 by a set threshold, the fuel pushes the valve plate 9 to overcome the spring force of the torsion spring 2, rotates upward along the pin 3, and the flap valve opens; when the fuel pressure difference above and below the valve plate 9 is less than the set threshold, the valve plate 9 rotates downward along the pin 3 under the action of the spring force of the torsion spring 2, and the flap valve closes.

[0026] Furthermore,

[0027] When the top of the glue 8 is not parallel to the valve plate 9, the valve plate 9 takes the axis of the screw 6 as a fulcrum, and under the action of the spring force of the torsion spring 2, it rotates around the fulcrum within a set angle range, adaptively fitting the glue 8 to ensure the sealing effect.

[0028] Furthermore,

[0029] When the sealing ring surface 9-2 of the valve plate 9 is uneven, the valve plate 9 moves radially under the action of the upper and lower fuel pressure differences, adaptively looking for the flat part of the sealing ring surface 9-2 to fit the top of the glue 8 to ensure the sealing effect.

[0030] The utility model adopts a flap valve with adaptive movable compensation. The valve plate can rotate and move within a certain range around a fixed fulcrum. The flap valve structure can be automatically adjusted. The valve plate can freely move or rotate within a certain gap range to compensate for the deflection caused by the processing error between the glue pressing plane and the valve plate plane, thereby ensuring the sealing of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The overall structure diagram of the flap valve with adaptive movable compensation of the utility model;

[0032] Figure 2 This is a structural diagram of the valve seat of the utility model;

[0033] Figure 3 This is a structural diagram of the valve plate of the utility model;

[0034] Figure 4 This is a structural diagram of the valve arm of the utility model;

[0035] Figure 5 This is a structural diagram of a convex washer of the utility model;

[0036] Figure 6 The structure diagram of radial clearance and axial clearance of the active compensation of the utility model;

[0037] Figure 7 This is a structural diagram of the valve plate of the utility model;

[0038] Figure 8 It is a schematic diagram of the sealing structure of the utility model;

[0039] Fig. 9 It is a schematic diagram of the movable compensation of the valve plate rotation of the utility model. DETAILED DESCRIPTION

[0040] In order to more intuitively and clearly describe the structural principle and working method in the examples of the present utility model, the embodiments will be introduced below in conjunction with the relevant drawings.

[0041] like Figure 1 As shown, the present application provides a flap valve with adaptive activity compensation, which includes: a flap valve seat 1, a torsion spring 2, a pin 3, a flap valve arm 4, a self-locking nut 5, a screw 6, a convex washer 7, a glue 8, and a flap valve plate 9.

[0042] like Figure 2 As shown, the valve seat 1 includes a support arm 1-1, a rubber pressing groove 1-2, a torsion spring limiting hole 1-3 is opened on the base, rubber ring grooves 1-4 are opened on the upper and lower surfaces of the valve seat 1, and a pin shaft mounting hole 1-5 is opened on the support arm 1-1;

[0043] like Figure 3 As shown, the torsion spring support foot 2-2 of the torsion spring 2 is fixed in the torsion spring limiting hole 1-3, and the torsion spring arm 2-1 at the other end is pressed on the valve arm 4;

[0044] The pin 3 passes through the spring coil 2-3 of the torsion spring 2 and is interference fixed in the pin mounting hole 1-5 of the support arm of the valve seat 1;

[0045] like Figure 4 As shown, the valve arm 4 includes a pressure plate 4-1 and a rotary arm 4-2. The pressure plate 4-1 is provided with a valve mounting hole 4-3, and the rotary arm 4-2 is provided with a pin shaft mounting hole 4-4.

[0046] The screw 6 passes through the valve arm 4, the convex washer 7 and the valve plate 9, and the end of the screw 6 is fastened and locked by the self-locking nut 5;

[0047] like Figure 5 As shown, the convex washer 7 is divided into a large end 7-1 and a small end 7-2. The small end 7-2 is inserted into the valve mounting hole 4-3 of the valve arm 4, and the radial clearance is maintained (such as Figure 6 As shown), the end face of the large end 7-1 is pressed by the self-locking nut 5, and the large end and the valve arm 4 are kept in a clearance fit in the axial direction (as shown Figure 6 As shown), the self-locking nut 5 is pressed on the plane of the large end 7-1 of the convex washer 7;

[0048] The glue 8 is pressed onto the glue groove 1-2 of the valve seat 1 through a vulcanization process, and the top of the glue 8 is a pointed ring.

[0049] like Figure 7 As shown, the valve plate 9 includes a valve mounting hole 9-1, a sealing ring surface 9-2 and a retaining groove 9-3. The sealing ring surface 9-2 presses the top of the pressing glue 8 to play a sealing role.

[0050] Specifically, the glue 8 is vulcanized and fixed in the glue groove 1-2 of the valve seat 1, and the pin 3 is interference-fitted in the limiting hole of the support arm 1-1 of the valve seat 1;

[0051] Specifically, the spring coil 2-3 of the torsion spring 2 is installed on the pin shaft 3, the torsion spring support foot 2-2 of the torsion spring 2 is fixed in the torsion spring limiting hole 1-3, and the torsion spring arm 2-1 at the other end is pressed on the valve arm 4;

[0052] Specifically, the valve arm 4 is installed on the pin shaft 3 through the pin shaft installation hole 4-4, the valve arm 4 can rotate around the pin shaft 3, and the pressure plate 4-1 of the valve arm 4 is pressed on the valve plate 9;

[0053] Specifically, Figure 6 As shown, the small end 7-2 of the convex washer 7 is inserted into the valve mounting hole 4-3 of the valve arm 4, the outer diameter of the small end 7-2 of the convex washer 7 is smaller than the valve mounting hole 4-3 of the valve arm 4, and the radial clearance is maintained. The clearance can be set within the range of (0.1mm-1.0mm) according to the valve adjustment needs. The upper end surface of the large end 7-1 is pressed by the self-locking nut 5, and the lower end surface of the large end 7-1 and the valve arm are kept with a clearance along the axial direction of the screw 6. The clearance can be set within the range of (0.1mm-1.5mm) according to the valve adjustment needs.

[0054] Specifically, the screw 6 is a hexagonal head screw, the screw rod passes through the valve mounting hole 9-1 of the valve plate 9, and the hexagonal head of the screw 6 falls into the stop groove 9-3 of the valve plate 9. The stop groove 9-3 is hexagonal and has an area slightly larger than the hexagonal head of the screw 6. It is better to just fit the screw into the stop groove to limit the screw and prevent it from rotating.

[0055] Specifically, the sealing ring surface 9-2 of the valve plate 9 is pressed on the pressure glue 8, and the sealing ring surface 9-2 presses the top of the pressure glue 8 to isolate the fuel on both sides of the valve plate 9;

[0056] Specifically, Figure 8 As shown, when the fuel pressure below the valve plate 9 is greater than the fuel pressure above the valve plate 9 to a set threshold, the fuel pushes the valve 9 to overcome the spring force of the torsion spring 2, rotates upward along the pin 3, and the valve opens; when the fuel pressure difference between the upper and lower parts of the valve plate 9 is less than the set threshold, the valve plate rotates downward along the pin 3 under the spring force of the torsion spring 2, and the valve closes;

[0057] Specifically, when the top of the glue 8 is not parallel to the valve plate 9 due to processing problems, the top of the glue 8 of the traditional valve structure cannot be completely fitted with the sealing ring surface 9-2 of the valve plate 9, resulting in fuel leakage and sealing failure; Fig. 9 As shown, the movable compensation structure designed by the utility model, the valve plate 9 can be around the axis of the screw 6 as a fulcrum, under the action of the torsion spring 2, it rotates around the fulcrum within a set angle range, adaptively fits the glue 8, and ensures the sealing effect. Fig. 9 ;

[0058] Specifically, when the sealing ring surface 9-2 of the valve plate 9 is uneven and partially concave and convex due to processing problems, the uneven part of the sealing ring surface 9-2 of the valve plate 9 fits with the top of the glue 8, and there is a gap in the fitting surface, which leads to fuel leakage and sealing failure. The movable compensation structure designed in the utility model can enable the valve plate 9 to move radially under the action of the upper and lower fuel pressure differences, adaptively find the flat part of the sealing ring surface 9-2 to fit with the top of the glue 8, and ensure the sealing effect.

Claims

1. A flap valve with adaptive activity compensation, characterized in that: The flap valve comprises: a valve seat (1), a torsion spring (2), a pin shaft (3), a valve arm (4), a self-locking nut (5), a screw (6), a convex washer (7), a pressure seal (8), and a valve plate (9); The valve seat (1) comprises a support arm (1-1), a rubber pressing groove (1-2), a torsion spring limiting hole (1-3) is provided on the base, rubber ring grooves (1-4) are provided on the upper and lower surfaces of the valve seat (1), and a first pin shaft mounting hole (1-5) is provided on the support arm (1-1); The torsion spring support foot (2-2) of the torsion spring (2) is fixed in the torsion spring limiting hole (1-3), and the torsion spring arm (2-1) at the other end is pressed on the valve arm (4); The pin shaft (3) passes through the spring coil (2-3) of the torsion spring (2) and is interference-fixed in the first pin shaft mounting hole (1-5) of the support arm of the valve seat (1); The valve arm (4) comprises a pressing plate (4-1) and a rotary arm (4-2); a first valve mounting hole (4-3) is formed on the pressing plate (4-1), and a second pin shaft mounting hole (4-4) is formed on the rotary arm (4-2); The screw (6) passes through the valve arm (4), the convex washer (7) and the valve plate (9), and the end of the screw (6) is fastened and locked by a self-locking nut (5); The convex washer (7) is divided into a large end (7-1) and a small end (7-2), the small end (7-2) is inserted into the first valve mounting hole (4-3) of the valve arm (4), and a clearance fit is maintained in the radial direction, the end surface of the large end (7-1) is pressed by the self-locking nut (5), and a clearance fit is maintained between the large end and the valve arm (4) in the axial direction, and the self-locking nut (5) is pressed on the plane of the large end (7-1) of the convex washer (7); The glue (8) is pressed onto the glue groove (1-2) of the valve seat (1) through a vulcanization process, and the top of the glue (8) is a pointed ring. The valve plate (9) comprises a second valve mounting hole (9-1), a sealing ring surface (9-2) and a stop groove (9-3); the sealing ring surface (9-2) presses the top of the pressing glue (8) to play a sealing role.

2. The flap valve with adaptive motion compensation according to claim 1, characterized in that: The valve arm (4) is mounted on the pin shaft (3) through the second pin shaft mounting hole (4-4). The valve arm (4) can rotate around the pin shaft (3). The pressure plate (4-1) of the valve arm (4) is pressed on the valve plate (9).

3. The flap valve with adaptive motion compensation according to claim 1, characterized in that: In the radial clearance-maintaining fit, the clearance is set within the range of 0.1 mm to 1.0 mm.

4. The flap valve with adaptive motion compensation according to claim 1, characterized in that: A clearance fit is maintained between the axial directions, and the clearance is set in the range of 0.1mm-1.5mm.

5. The flap valve with adaptive motion compensation according to claim 1, characterized in that: The screw (6) is a hexagonal head screw. The screw rod of the screw (6) passes through the second valve mounting hole (9-1) of the valve plate (9). The hexagonal head of the screw (6) falls into the stop groove (9-3) of the valve plate (9). The stop groove (9-3) is hexagonal and has a larger area than the hexagonal head of the screw (6) so as to limit the screw and prevent it from rotating.

6. The flap valve with adaptive motion compensation according to claim 1, characterized in that: The sealing ring surface (9-2) of the valve plate (9) is pressed on the pressure glue (8), and the sealing ring surface (9-2) presses the top of the pressure glue (8) to isolate the fuel on both sides of the valve plate (9).

7. The flap valve with adaptive motion compensation according to claim 1, characterized in that: When the fuel pressure below the valve plate (9) is greater than the fuel pressure above the valve plate (9) to a set threshold, the fuel pushes the valve plate (9) to overcome the spring force of the torsion spring (2), rotates upward along the pin shaft (3), and the flap valve opens; when the fuel pressure difference between the upper and lower parts of the valve plate (9) is less than the set threshold, the valve plate (9) rotates downward along the pin shaft (3) under the action of the spring force of the torsion spring (2), and the flap valve closes.

8. The flap valve with adaptive motion compensation according to claim 1, characterized in that: When the top of the pressure seal (8) is not parallel to the valve plate (9), the valve plate (9) rotates around the fulcrum within a set angle range under the action of the spring force of the torsion spring (2) around the axis of the screw (6) as a fulcrum, and adaptively fits the pressure seal (8) to ensure the sealing effect.

9. The flap valve with adaptive motion compensation according to claim 1, characterized in that: When the sealing ring surface (9-2) of the valve plate (9) is uneven, the valve plate (9) moves radially under the action of the upper and lower fuel pressure differences, and adaptively seeks a flat part of the sealing ring surface (9-2) to fit the top of the glue (8), thereby ensuring a sealing effect.

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