A miniaturized high-pressure pressure switch

Abstract

The invention belongs to the technical field of pressure instruments and meters, and relates to a miniaturized high-pressure pressure switch, comprising a pressure sensing component and a reed switch regulating component, wherein the pressure sensing component comprises a nozzle, a diaphragm, a sleeve, a push rod, a mounting frame, and a magnetic bead, and the reed switch regulating component comprises a reed switch, a stud, a mounting seat, and a sleeve nut (10); the diaphragm is used to sense system pressure, and after the diaphragm is deformed by pressure, it pushes the push rod and thus causes the magnetic bead to move, and the generated switch signal is output through a cable; the invention simplifies the internal structure of the pressure switch, uses a reed switch to replace a traditional contact combination to convert a displacement signal into an electrical signal, and uses a sleeve nut to adjust the upper and lower distances of the reed switch, so that the pressure switch can achieve the goal of miniaturization and high pressure.

Description

Technical Field

[0001] The present application belongs to the technical field of pressure measuring instruments, and specifically relates to a miniaturized high-pressure pressure switch. Background Art

[0002] Pressure switches are widely used in various onboard equipment of aircraft to provide pressure on / off signals. Pressure switches can be divided into two categories according to their working principles: the first category is mechanical pressure switches, which use the deformation of sensitive elements such as end tubes or diaphragms to push the micro switch or contact piece on or off through the transmission mechanism, thereby outputting a switch signal; the second category is electronic signal devices, which use silicon piezoresistors to measure system pressure, output voltage signals, and compare them with reference voltages to determine the on / off of the relay, thereby controlling the on / off of the pressure switch.

[0003] Compared with electronic pressure switches, mechanical pressure switches have low cost and high reliability, and can adapt to complex electromagnetic environments and harsh natural environments. Common mechanical pressure switches have obvious disadvantages, mainly because they require a large space structure and are heavy, which cannot meet the space structure requirements of airborne equipment. Summary of the invention

[0004] Purpose of the invention: To solve the problem of difficult structural design of mechanical pressure switches under limited space structure and weight, the present invention achieves the purpose of reducing weight and size through a structural design of a magnetic bead and a reed switch to meet the requirements of miniaturization and high pressure of pressure switches.

[0005] The present application provides a miniaturized high-pressure pressure switch, the switch comprising:

[0006] Take-over nozzle 1, connected with the system pipeline;

[0007] A diaphragm 2, mounted on the pressure nozzle 1, the diaphragm is used to sense system pressure and transmit displacement;

[0008] A push rod 4 is mounted on the center hole of the diaphragm;

[0009] A stop block 3 is mounted on the top rod, and is used to protect the diaphragm after overpressure;

[0010] A magnetic bead 6 is installed in the stop block 3;

[0011] A mounting frame 5 connected to the press nozzle;

[0012] The outer sleeve nut 10 is mounted on the mounting frame 5;

[0013] Stud 8, mounted on the outer sleeve nut 10;

[0014] A mounting seat 9, mounted on the stud 8;

[0015] A reed switch 7, mounted on the mounting seat 9;

[0016] Among them, the pressure medium enters the pressure chamber of the pressure switch through the center hole of the nozzle and acts on the diaphragm surface. After the diaphragm senses the system pressure and deforms, it drives the push rod and then causes the magnetic bead to move. As the magnetic bead approaches, the reed switch switches the signal and outputs it through the cable.

[0017] Preferably, the filler nozzle 1 has an external thread 101, a center hole 102, an external hexagon 103 and a fuse hole 104. The main function of the external thread is to connect the filler nozzle to the pressure system; the main function of the center hole is to introduce the system pressure into the pressure chamber of the pressure switch and provide an installation position for the diaphragm; the main function of the external hexagon is to provide a tool position for the installation tool when the pressure switch is connected to the pressure system; the main function of the fuse hole is to connect and fix the pressure switch and the pressure system through stainless steel wire to prevent the external thread of the filler nozzle from loosening.

[0018] Preferably, the diaphragm 2 is a bowl-shaped structure with a central hole 201, and its function is to sense the pressure in the pressure chamber of the pressure switch and convert the pressure into the displacement of the center of the diaphragm.

[0019] Preferably, the push rod 4 has an external thread 401 at one end and a circular boss 402 at the other end, and the circular boss end is fixed to the center hole of the diaphragm by vacuum electron beam welding.

[0020] Preferably, the stop block 3 has a circular boss with an internal threaded hole 301 at one end and a thin rod with an internal hole structure 302 at the other end. The circular boss end is connected to the top rod through a thread. The function of the circular boss is to contact with the center 502 of the mounting frame after the limit pressure is reached to avoid plastic deformation of the diaphragm after overpressure.

[0021] Preferably, the magnetic bead 6 is fixed in the inner hole of the thin rod end of the stop block by interference fit.

[0022] Preferably, one end of the mounting frame 5 is an inner hole 501, whose end face is fixed to the outer hexagonal end face of the nozzle by laser welding; the other end is a plane with a center hole 502 and a sleeve nut mounting hole 503 on the plane.

[0023] Preferably, the outer sleeve nut 10 is a nut comprising internal and external threads, and its main function is to install the stud and ensure that the stud does not rotate during the adjustment process; the stud 8 is an externally threaded slender rod structure, and its main function is to provide an installation position for the mounting seat; the mounting seat 9 is a plate-like structure with an arc groove, and its main function is to provide an installation position for the reed switch; the diaphragm and the pressure measuring nozzle are fixed by vacuum electron beam welding; the reed switch adjustment assembly can change the installation height of the stud on the mounting seat through the outer sleeve nut to prevent the reed switch from rotating during the error adjustment process; the reed switch adjustment assembly can be directly installed on the mounting seat through the action of the outer sleeve nut, and the error is adjusted by adjusting the outer sleeve nut during adjustment; the material selected for the diaphragm is 3J53 constant elastic alloy.

[0024] This application has the following technical effects:

[0025] 1. The present invention designs a miniaturized high-pressure pressure switch through a jacket nut scheme, and realizes the linear up and down movement of the reed switch by rotating the jacket nut;

[0026] 2. The present invention innovatively uses a combination of a magnetic bead and a reed switch for a pressure switch;

[0027] 3. The present invention has the characteristics of low cost, high reliability and high update and iteration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the installation of the outer sleeve nut of the present invention;

[0030] Figure 3 It is a structural diagram of the nozzle of the present invention;

[0031] Figure 4 is a structural diagram of the diaphragm of the present invention;

[0032] Figure 5 It is a structural diagram of the top rod of the present invention;

[0033] Figure 6 It is a structural diagram of the stop block of the present invention;

[0034] Figure 7 It is a structural diagram of the mounting frame of the present invention;

[0035] Figure 8 It is a structural diagram of the outer sleeve nut of the present invention;

[0036] Fig. 9 It is a schematic diagram of the external structure of the present invention. DETAILED DESCRIPTION

[0037] The present invention belongs to the technical field of pressure instruments and meters, and relates to a structural design of a miniaturized high-pressure pressure switch. It includes a pressure sensing component and a reed switch adjustment component, the pressure sensing component includes a nozzle 1, a diaphragm 2, a sleeve 3, a push rod 4, a mounting frame 5, and a magnetic bead 6, and the reed switch adjustment component includes a reed switch 7, a stud 8, a mounting seat 9, and a jacket nut 10; the diaphragm is used to sense the system pressure, and after the diaphragm is deformed by pressure, it pushes the push rod to make the magnetic bead move, and the generated switch signal is output through a cable.

[0038] The present invention simplifies the internal structure of the pressure switch, uses a reed switch to replace the traditional contact combination to convert the displacement signal into an electrical signal, and uses a sheath nut to adjust the upper and lower distances of the reed switch, so that the pressure switch can achieve the goal of miniaturization and high pressure.

[0039] See also Figure 1-Figure 9 , providing a structural design of a miniaturized high-pressure pressure switch. It includes a pressure-sensing component and a reed switch adjustment component. The pressure-sensing component includes a nozzle 1, a diaphragm 2, a stop block 3, a push rod 4, a mounting frame 5, and a magnetic bead 6; the reed switch adjustment component includes a reed switch 7, a stud 8, a mounting seat 9, and a sleeve nut 10. The diaphragm is used to sense the system pressure. After the diaphragm is deformed by the pressure, it pushes the push rod and then causes the magnetic bead to move, so that the contacts of the reed switch 5 are in contact or disconnected, and the switch on and off signals are output and output through a cable. The present invention simplifies the internal structure of the pressure switch, and uses a reed switch to replace the traditional contact combination to convert the displacement signal into an electrical signal, so that the pressure switch can achieve the goal of miniaturization and high pressure.

[0040] This application has the following technical effects:

[0041] 1. The present invention designs a miniaturized high-pressure pressure switch through a jacket nut scheme, and realizes the linear up and down movement of the reed switch by rotating the jacket nut;

[0042] 2. The present invention innovatively uses a combination of a magnetic bead and a reed switch for a pressure switch;

[0043] 3. The present invention has the characteristics of low cost, high reliability and high update and iteration efficiency.

[0044] In other embodiments of the present application, the present application provides a structural design of a miniaturized high-pressure pressure switch, including a pressure-sensing component and a reed switch adjustment component, wherein the pressure-sensing component includes a nozzle 1, a diaphragm 2, a stopper 3, a push rod 4, a mounting frame 5, and a magnetic bead 6; and the reed switch adjustment component includes a reed switch 7, a stud 8, a mounting seat 9, and a jacket nut 10.

[0045] The working principle of the pressure switch is to use a diaphragm (the top of which can be equipped with magnetic beads of different magnetic forces) to sense the system pressure. When the measured pressure P enters the pressure chamber through the nozzle, the diaphragm deforms after sensing the pressure, and its center produces a corresponding displacement, pushing the top rod and thus causing the magnetic beads to move. When the measured pressure is greater than the atmospheric pressure, the diaphragm drives the magnetic column to move upward. At the same time, the diaphragm is limited by the lower stop nut when the limit pressure is reached, and no more displacement occurs, ensuring that the performance of the diaphragm is intact and plastic deformation is not caused by excessive displacement; when the measured pressure begins to return to atmospheric pressure, the diaphragm recovers and deforms back to the initial position, and the movement of the magnetic column causes the contacts of the reed switch 7 to contact or disconnect, thereby achieving the purpose of outputting the switch on and off signals and monitoring the pressure.

[0046] First, fix the push rod 4 to the center of the diaphragm 2 by electron beam welding, fix the diaphragm assembly to the pressure measuring nozzle 1 by electron beam welding, then fix the magnetic bead 6 to the stop block 3 by gluing, and screw the stop block 3 into the thread of the push rod 4. Finally, fix the reed switch 7 to the mounting seat 9 by gluing, and install it on the stud 8. The other side of the stud is screwed into the outer nut 10, and the whole is screwed into the threaded hole of the mounting frame 5 through the outer nut. After completing the above assembly, the threaded connection between the moving block and the pressure measuring nozzle is supplemented and fixed and sealed by laser welding.

[0047] When the system pressure rises to the pressure switch point, the diaphragm 2 senses the pressure and moves, pushing the top rod-magnetic bead upward, causing the contacts of the normally open reed switch to contact, thereby outputting a connection signal.

[0048] When the system pressure increases further, the diaphragm 2 is already limited by the stop block 3 at a certain pressure and no longer moves, thereby preventing the diaphragm from plastically deforming under overpressure conditions.

[0049] When the system pressure drops to the pressure switch point, the diaphragm 2 begins to recover its deformation and drives the push rod 4 to move downward, so that the closed reed switch contacts are disconnected, thereby outputting a disconnection signal.

Claims

1. A miniaturized high-pressure pressure switch, characterized in that: The switch comprises: A take-over nozzle (1) connected to a system pipeline; A diaphragm (2) is mounted on the pressure nozzle (1), and is used to sense system pressure and transmit displacement; A push rod (4) is mounted on the center hole of the diaphragm; A stop block (3) is mounted on the top rod, and is used to protect the diaphragm after overpressure; A magnetic bead (6) installed in the stop block (3); A mounting frame (5) connected to the pressure nozzle; An outer sleeve nut (10) mounted on the mounting frame (5); A stud (8) mounted on the outer sleeve nut (10); A mounting seat (9) mounted on the stud (8); A reed switch (7) mounted on the mounting seat (9); Among them, the pressure medium enters the pressure chamber of the pressure switch through the center hole of the nozzle and acts on the diaphragm surface. After the diaphragm senses the system pressure and deforms, it drives the push rod and then causes the magnetic bead to move. As the magnetic bead approaches, the reed switch switches the signal and outputs it through the cable.

2. The switch according to claim 1, characterized in that: The pipe nozzle (1) has an external thread (101), a center hole (102), an external hexagon (103) and a fuse hole (104). The external thread mainly functions to connect the pipe nozzle to the pressure system; the center hole mainly functions to introduce the system pressure into the pressure chamber of the pressure switch and provide a mounting position for the diaphragm; the external hexagon mainly functions to provide a tool position for the installation tool when the pressure switch is connected to the pressure system; the fuse hole mainly functions to connect and fix the pressure switch and the pressure system through a stainless steel wire to prevent the external thread of the pipe nozzle from loosening.

3. The switch according to claim 2, characterized in that: The diaphragm (2) is a bowl-shaped structure with a central hole (201), and its function is to sense the pressure in the pressure chamber of the pressure switch and convert the pressure into displacement of the center of the diaphragm.

4. The switch according to claim 3, characterized in that: The push rod (4) has an external thread (401) at one end and a circular boss (402) at the other end, and the circular boss end is fixed to the central hole of the diaphragm by vacuum electron beam welding.

5. The switch according to claim 4, characterized in that: The stop block (3) has a circular boss with an internal threaded hole (301) at one end and a thin rod with an internal hole structure (302) at the other end. The circular boss end is connected to the top rod through a thread. The function of the circular boss is to contact the center of the mounting frame (502) after reaching the limit pressure, so as to avoid plastic deformation of the diaphragm after overpressure.

6. The switch according to claim 5, characterized in that: The magnetic bead (6) is fixed in the inner hole of the thin rod end of the stop block by interference fit.

7. The switch according to claim 1, characterized in that: One end of the mounting frame (5) is an inner hole (501), and its end face is fixed to the outer hexagonal end face of the nozzle by laser welding; the other end is a plane, and the plane has a center hole (502) and a sleeve nut mounting hole (503).

8. The switch according to claim 7, characterized in that The outer sleeve nut (10) is a nut including internal and external threads, and its main function is to install the stud and ensure that the stud does not rotate during the adjustment process; the stud (8) is an external threaded slender rod structure, and its main function is to provide a mounting position for the mounting seat; the mounting seat (9) is a plate-like structure with an arc groove, and its main function is to provide a mounting position for the reed switch; the diaphragm and the pressure measuring nozzle are fixed by vacuum electron beam welding; the reed switch adjustment component can change the installation height of the stud on the mounting seat through the outer sleeve nut to prevent the reed switch from rotating during the error adjustment process; the reed switch adjustment component can be directly installed on the mounting seat through the action of the outer sleeve nut, and the error is adjusted by adjusting the outer sleeve nut during adjustment; the material selected for the diaphragm is 3J53 constant elastic alloy.

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