Miniaturized aircraft pressure relief valve

Abstract

The present application relates to the technical field of cabin pressure regulator, in particular to a miniaturized aircraft pressure relief valve, which comprises a shell (1), a diaphragm assembly (3), a micro switch screw rod (4), a micro switch (5), an electric connector (20), a wire (21), a spring (22), an upper cover (13) and a pressure regulating screw sleeve (14). The pressure relief valve can realize the function of controlling pressure release and providing an indication signal of "valve fully open". When the pressure relief valve is fully open, the diaphragm assembly moves upward and presses the micro switch contact, thereby effectively avoiding the problem of signal abnormality caused by long-term compression of the micro switch contact.

Description

Technical Field

[0001] This invention relates to the field of aircraft cabin pressure regulator technology, and more specifically to a miniaturized aircraft pressure relief valve. Background Technology

[0002] Aircraft pressure relief valves are the main equipment in the aircraft pressure regulation system for controlling cabin pressure. They open when the pressure difference between the inside and outside of the cabin reaches a certain value, maintaining the cabin pressure at a specified level, thereby protecting the safety of items inside the cabin and the aircraft structure. Pressure relief valves are generally installed on the aircraft cabin wall. The pressure sensing element detects the difference between the cabin pressure and atmospheric pressure, and the control mechanism controls the working state of the aircraft pressure relief valve.

[0003] Current aircraft pressure relief valves have the following problems: they sense a large range of pressure difference between the inside and outside of the cabin, require high precision in opening pressure, and are also relatively large in size and weight; they cannot achieve high-precision pressure control. Summary of the Invention

[0004] The purpose of this invention is to provide a miniaturized aircraft pressure relief valve to solve the problems of large pressure relief values, low pressure control accuracy, and large size of current aircraft pressure relief valves, and to solve the problem of abnormal signals caused by the microswitch contacts on the pressure relief valve being in a long-term compressed state.

[0005] The technical solution of the present invention:

[0006] To achieve the above-mentioned objectives, a miniaturized aircraft pressure relief valve is proposed, comprising: a housing 1, a diaphragm assembly 3, a micro switch screw 4, a micro switch 5, an electrical connector 20, a wire 21, a spring 22, a top cover 13, and a pressure regulating screw sleeve 14.

[0007] The housing 1 has a concave structure with a pressure-sensing window at the center of its bottom end face; the diaphragm assembly 3 has an outer shape that matches the concave inner surface of the housing and is fitted onto the inner surface of the housing 1; the upper cover 13 is disposed above the diaphragm assembly 3 and is connected to the housing 1 by screws to press and fix the diaphragm assembly 3; the upper end of the micro switch screw 4 is threadedly connected to the pressure regulating screw sleeve 14, which is threaded into the top mounting hole of the upper cover 13, and its lower end side is fixed. The micro switch 5 has a switch contact 5a on its bottom end face; the electrical connector 20 is fixed in the electrical connector mounting base at the upper end of the upper cover 13 and is electrically connected to the micro switch 5 through the wire 21; the spring 22 is compressed between the pressure adjusting screw sleeve 14 and the diaphragm assembly 3; the diaphragm assembly 3 can bulge upward under the action of external air pressure, and when the diaphragm assembly 3 bulges to press the lower switch contact 5a of the micro switch 5, a valve fully open signal is output through the electrical connector.

[0008] Preferably, it further includes a hexagonal thin nut 15 and a tightening sleeve 16; the tightening sleeve 16 is disposed above the pressure adjusting screw sleeve 14 and is used to fix and limit the pressure adjusting screw sleeve 14; the hexagonal thin nut 15 is used to fix and limit the micro switch screw 4.

[0009] In one possible embodiment, the lower end of the pressure regulating screw sleeve 14 is designed with a limit structure, and the small end of the spring 22 is located at the lower limit of the pressure regulating screw sleeve 14 to prevent the spring from deflecting and affecting the pressure release accuracy and the reset of the diaphragm assembly 3.

[0010] In one possible embodiment, the outer side of the upper end of the pressure adjusting screw sleeve 14 is threaded, and the connection with the upper cover 13 is a threaded connection, which can adjust the compression distance of the spring 22 during installation.

[0011] In one possible embodiment, the micro switch screw 4 and the pressure regulating sleeve 14 are connected by threads, which can adjust the distance between the micro switch 5 and the diaphragm assembly 3.

[0012] In one possible embodiment, the pressure regulating sleeve 14 and the micro switch screw 4 can respectively adjust the installation position of the spring 22 and the micro switch screw 4 without interfering with each other, which facilitates the adjustment of pressure relief accuracy and improves reliability.

[0013] In one possible embodiment, the diaphragm assembly 3 includes a rigid core 3-1 disposed at the center of the concave inner surface and an elastic body 3-2; the rigid core 3-1 is a circular piece with an annular groove, and the annular groove has multiple through holes in the circumferential direction; the elastic body fills the annular groove and is integrally formed with the rigid core 3-1.

[0014] In one possible embodiment, the thickness of the filling area between the elastic body 3-2 and the rigid core 3-1 in the diaphragm assembly 3 is 6 mm to prevent the rigid core 3-1 and the elastic body 3-2 from cracking and falling off, which would lead to functional failure. The bottom outer periphery of the diaphragm assembly 3 is locally thickened to a thickness of 6 mm to increase the contact surface and prevent deformation of the contact surface of the diaphragm assembly 3.

[0015] In one possible embodiment, the diaphragm assembly 3 and the housing 1 are linearly sealed.

[0016] In one possible embodiment, it also includes a dust cover 19 and a cylindrical head screw 18 with a safety hole in the head; the dust cover 19 is fixed to the top mounting hole end face of the upper cover 13 by the cylindrical head screw 18 with a safety hole in the head.

[0017] In one possible embodiment, it also includes a filter assembly 23 and a retaining ring 24; the upper cover 13 has an exhaust hole, and the filter assembly 23 is fixed in the exhaust hole by the retaining ring 24.

[0018] In one possible embodiment, the micro switch screw 4 has a hollow inner cavity A in the middle. The wire connecting the micro switch terminal is connected to the electrical connector 20 through cavity A. Cavity A is filled with adhesive to prevent the wire 21 from shaking inside cavity A.

[0019] In one possible embodiment, the tightening sleeve 16 is designed with a hexagonal hole in the middle for easy disassembly.

[0020] In one possible embodiment, the middle two sides of the pressure regulating screw sleeve 14 are designed with through holes for easy disassembly.

[0021] In one possible embodiment, the middle part of the micro switch screw 4 is designed as a hollow inner cavity to prevent the wire from being connected to the electrical connector 20 through the tightening sleeve 16, which facilitates the adjustment of the micro switch position and prevents the wire 21 from falling off the micro switch 5.

[0022] In one possible embodiment, the electrical connector 20 is connected to the upper cover 13 to form a cavity B. After the wires are connected, glue is poured into cavity B to prevent the wires from shaking in the vibration environment, which would cause poor contact between the electrical connector 20 and the wires 21 and prevent the transmission of the "valve fully open signal".

[0023] Preferably, the spring 22 is a conical spring, with the small end of the spring 22 contacting the pressure adjusting screw sleeve 14 and the large end of the spring 22 contacting the diaphragm assembly 3.

[0024] The beneficial effects of this invention are as follows: This invention proposes a miniaturized aircraft pressure relief valve, which not only realizes the function of controlling pressure relief, but also provides the function of "valve fully open" indication signal. When the pressure relief valve is fully open, the diaphragm assembly moves upward to press the micro switch contact, which effectively avoids the problem of signal abnormality caused by long-term compression of the micro switch contact. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a miniaturized aircraft pressure relief valve according to an embodiment of the present invention. Figure 1 .

[0026] Figure 2 This is a schematic diagram of the structure of a miniaturized aircraft pressure relief valve according to an embodiment of the present invention. Figure 2 .

[0027] Figure 3 This is a schematic diagram of the rigid core 3-1 in the diaphragm assembly 3 of a miniaturized aircraft pressure relief valve according to an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of a diaphragm assembly 3 for a miniaturized aircraft pressure relief valve according to an embodiment of the present invention.

[0029] The components include: 1. Housing; 2. O-ring; 3. Diaphragm assembly; 3-1. Hard core; 3-2. Elastic body; 4. Microswitch screw; 5. Microswitch contact 5a; 6. Washer 1; 7. Stainless steel spring washer; 8. Cylindrical head screw; 9. Hexagonal flattened self-locking nut; 10. Washer 2; 11. Standard spring washer; 12. Socket hexagonal head screw; 13. Top cover; 14. Adjusting screw sleeve; 15. Hexagonal thin nut; 16. Tightening sleeve; 17. Washer 3; 18. Cylindrical head screw with safety hole; 19. Dust cover; 20. Electrical connector; 21. Wire; 22. Spring; 23. Filter assembly; 24. Retaining ring. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0032] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1-4As shown, a miniaturized aircraft pressure relief valve is characterized in that the structure includes a housing 1, an O-ring 2, a diaphragm assembly 3, a micro switch screw 4, a micro switch 5, a micro switch contact 5a, a washer 6, a stainless steel spring washer 7, a cylindrical head screw 8, a hexagonal flattened self-locking nut 9, a washer 10, a standard spring washer 11, an internal hexagonal cylindrical head screw 12, a top cover 13, a pressure adjusting screw sleeve 14, a hexagonal thin nut 15, a tightening sleeve 16, a washer 3 17, a cylindrical head screw with a safety hole at the head 18, a dust cover 19, an electrical connector 20, a wire 21, a spring 22, a filter assembly 23, and a retaining ring 24; wherein, the O-ring 2 is installed in a groove at the bottom of the housing 1, the diaphragm assembly 3 is installed inside the housing 1 and the top cover 13, the spring 22 is installed inside the diaphragm assembly 3 and the top cover 13, and the micro switch 5 is installed in... The right side of the lower end of the micro switch screw 4, the right side of the micro switch 5, and the left side of the washer 6 are connected. The right side of the washer 6 is connected to the left side of the stainless steel spring washer 7. The right side of the stainless steel spring washer 7 is connected to the left side of the cylindrical head screw 8. The upper end of the micro switch screw 4 is connected to the inner side of the pressure regulating sleeve 14. The outer side of the pressure regulating sleeve 14 is connected to the threaded hole in the middle of the upper cover 13. The tightening sleeve 16 is installed at the upper end of the threaded hole in the middle of the upper cover 13. The tightening sleeve 16 is located at the upper end of the pressure regulating sleeve 14. Two hexagonal thin nuts 15 are located at the upper middle of the pressure regulating sleeve 14. The dust cover 19 is located at the upper end of the upper cover 13. The washer 17 is located on the upper side of the dust cover 19. The cylindrical head screw 18 with a safety hole on the head is located on the upper side of the washer 17. The electrical connector 20 is located on the left side of the upper end of the upper cover 13. The filter assembly 23 is installed in the vent hole on the left side of the upper cover 13. The retaining ring 24 is installed on the left side of the filter assembly.

[0034] Preferably, it further includes a hexagonal thin nut 15 and a tightening sleeve 16; the tightening sleeve 16 is disposed above the pressure adjusting screw sleeve 14 and is used to fix and limit the pressure adjusting screw sleeve 14; the hexagonal thin nut 15 is used to fix and limit the micro switch screw 4.

[0035] In one possible embodiment, the lower end of the pressure regulating screw sleeve 14 is designed with a limit structure, and the small end of the spring 22 is located at the lower limit of the pressure regulating screw sleeve 14 to prevent the spring from deflecting and affecting the pressure release accuracy and the reset of the diaphragm assembly 3.

[0036] In one possible embodiment, the outer side of the upper end of the pressure adjusting screw sleeve 14 is threaded, and the connection with the upper cover 13 is a threaded connection, which can adjust the compression distance of the spring 22 during installation.

[0037] In one possible embodiment, the micro switch screw 4 and the pressure regulating sleeve 14 are connected by threads, which can adjust the distance between the micro switch 5 and the diaphragm assembly 3.

[0038] In one possible embodiment, the pressure regulating sleeve 14 and the micro switch screw 4 can respectively adjust the installation position of the spring 22 and the micro switch screw 4 without interfering with each other, which facilitates the adjustment of pressure relief accuracy and improves reliability.

[0039] In one possible embodiment, the diaphragm assembly 3 includes a rigid core 3-1 disposed at the center of the concave inner surface and an elastic body 3-2; the rigid core 3-1 is a circular piece with an annular groove, and the annular groove has multiple through holes in the circumferential direction; the elastic body fills the annular groove and is integrally formed with the rigid core 3-1.

[0040] In one possible embodiment, the thickness of the filling area between the elastic body 3-2 and the rigid core 3-1 in the diaphragm assembly 3 is 6 mm to prevent the rigid core 3-1 and the elastic body 3-2 from cracking and falling off, which would lead to functional failure. The bottom outer periphery of the diaphragm assembly 3 is locally thickened to a thickness of 6 mm to increase the contact surface and prevent deformation of the contact surface of the diaphragm assembly 3.

[0041] In one possible embodiment, the diaphragm assembly 3 and the housing 1 are linearly sealed.

[0042] In one possible embodiment, it also includes a dust cover 19 and a cylindrical head screw 18 with a safety hole in the head; the dust cover 19 is fixed to the top mounting hole end face of the upper cover 13 by the cylindrical head screw 18 with a safety hole in the head.

[0043] In one possible embodiment, it also includes a filter assembly 23 and a retaining ring 24; the upper cover 13 has an exhaust hole, and the filter assembly 23 is fixed in the exhaust hole by the retaining ring 24.

[0044] In one possible embodiment, the micro switch screw 4 has a hollow inner cavity A in the middle. The wire connecting the micro switch terminal is connected to the electrical connector 20 through cavity A. Cavity A is filled with adhesive to prevent the wire 21 from shaking inside cavity A.

[0045] In one possible embodiment, the tightening sleeve 16 is designed with a hexagonal hole in the middle for easy disassembly.

[0046] In one possible embodiment, the middle two sides of the pressure regulating screw sleeve 14 are designed with through holes for easy disassembly.

[0047] In one possible embodiment, the middle part of the micro switch screw 4 is designed as a hollow inner cavity to prevent the wire from being connected to the electrical connector 20 through the tightening sleeve 16, which facilitates the adjustment of the micro switch position and prevents the wire 21 from falling off the micro switch 5.

[0048] In one possible embodiment, the electrical connector 20 is connected to the upper cover 13 to form a cavity B. After the wires are connected, glue is poured into cavity B to prevent the wires from shaking in the vibration environment, which would cause poor contact between the electrical connector 20 and the wires 21 and prevent the transmission of the "valve fully open signal".

[0049] Preferably, the spring 22 is a conical spring, with the small end of the spring 22 contacting the pressure adjusting screw sleeve 14 and the large end of the spring 22 contacting the diaphragm assembly 3.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A miniaturized aircraft pressure relief valve, characterized in that, Includes: housing (1), diaphragm assembly (3), micro switch screw (4), micro switch (5), electrical connector (20), wire (21), spring (22), top cover (13), and pressure regulating screw sleeve (14); The housing (1) has a concave structure with a pressure-sensitive window at the center of its bottom end face; the diaphragm assembly (3) has an external shape that matches the concave inner surface of the housing and is fitted onto the inner surface of the housing (1); the top cover (13) is located above the diaphragm assembly (3), and is connected to the housing (1) by screws to press and fix the diaphragm assembly (3); the upper end of the micro switch screw (4) is threadedly connected to the adjusting screw sleeve (14) threaded into the top mounting hole of the top cover (13), and the lower end of the micro switch screw (4) is fixed with a micro switch (5) having a switch contact (5a) on its bottom end face; the electrical connector (20) is fixed in the electrical connector mounting seat at the upper end of the top cover (13) and is electrically connected to the micro switch (5) through the wire (21); the spring (22) is compressed between the adjusting screw sleeve (14) and the diaphragm assembly (3); the diaphragm assembly (3) can Under external air pressure, it bulges upward. When the diaphragm assembly (3) bulges to the point where the lower switch contact (5a) of the micro switch (5) is pressed, a fully open valve signal is output through the electrical connector. The diaphragm assembly (3) includes a hard core (3-1) and an elastic body (3-2) disposed at the center of the concave inner surface. The hard core (3-1) is a circular piece with an annular groove, and multiple through holes are provided in the circumferential direction of the annular groove. The elastic body fills the annular groove and is connected to the hard core (3-1). The micro switch screw (4) has a hollow inner cavity A in the middle. The wire is connected to the micro switch terminal and connected to the electrical connector (20) through cavity A. The cavity A is filled with glue to prevent the wire (21) from shaking in the cavity A. The electrical connector (20) is connected to the top cover (13) to form a hollow cavity B. After the wire is connected, glue is poured into cavity B to prevent the wire from shaking in the vibration environment, which would cause poor contact between the electrical connector (20) and the wire (21) and thus fail to transmit the valve fully open signal.

2. The miniaturized aircraft pressure relief valve according to claim 1, characterized in that, The spring (22) is a conical spring. The small end of the spring (22) contacts the adjusting screw sleeve (14), and the large end of the spring (22) contacts the diaphragm assembly (3).

3. The miniaturized aircraft pressure relief valve according to claim 1, characterized in that, It also includes a hexagonal thin nut (15) and a tightening sleeve (16); the tightening sleeve (16) is disposed above the pressure adjusting screw sleeve (14) and is used to fix and limit the pressure adjusting screw sleeve (14); the hexagonal thin nut (15) is used to fix and limit the micro switch screw (4).

4. A miniaturized aircraft pressure relief valve according to claim 1, characterized in that, It also includes a dust cover (19) and a cylindrical head screw (18) with a safety hole in the head; the dust cover (19) is fixed to the top mounting hole end face of the upper cover (13) by the cylindrical head screw (18) with a safety hole in the head.

5. A miniaturized aircraft pressure relief valve according to claim 1, characterized in that, It also includes a filter assembly (23) and a retaining ring (24); the upper cover (13) has an exhaust hole, and the filter assembly (23) is fixed in the exhaust hole by the retaining ring (24).

6. A miniaturized aircraft pressure relief valve according to claim 1, characterized in that, The micro switch screw (4) is designed with a hollow inner cavity in the middle to prevent the wire from being connected to the electrical connector (20) through the tightening sleeve (16), which facilitates the adjustment of the micro switch position and prevents the wire (21) from falling off the micro switch (5).

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