A pressure switch and method for monitoring pipeline pressure

Abstract

The invention discloses a pressure switch and method for pipeline pressure monitoring, comprising an outer shell, an inner cavity and a connector connected in sequence; the outer shell is cylindrical, a target structure is arranged inside the outer shell, the target structure is circular, the diameter of the target structure is the same as the inner diameter of the outer shell, the target structure is slidably connected to the inner wall of the outer shell, and a permanent magnet is arranged on the side of the target structure facing the inner cavity; the outer shell is nested on the inner cavity, the inner cavity is located at the end of the outer shell, a spring is nested on the inner cavity, one end of the spring is connected to the inner cavity, and the other end is connected to the side of the target structure facing the inner cavity; a magnetic field detection circuit is arranged inside the inner cavity. The pressure impact in the pipeline of the aircraft hydraulic system is monitored in real time, and a feedback signal is provided.

Description

Technical Field

[0001] The invention belongs to the field of aviation equipment and relates to a pressure switch and a method for monitoring pipeline pressure. Background Art

[0002] The hydraulic system provides hydraulic energy as power for aircraft flight control systems, high lift systems, landing gear systems and other systems. It is an indispensable system in modern large military and civil aircraft. There are a large number of valve control devices / systems in the aircraft hydraulic system, which control the action of downstream hydraulic components through valves, such as controlling the start and stop of actuators such as actuators and hydraulic motors. When the valve is working, it often causes fluctuations in the pressure of the hydraulic system. In severe cases, it even causes pressure shocks in the local hydraulic system. After long-term operation, hydraulic equipment and pipelines will be damaged due to fatigue. This not only increases the operating cost of the aircraft, but also directly affects the flight safety of the aircraft. Therefore, eliminating pressure shocks in the aircraft hydraulic system is of great significance to improving the handling quality and safety of the aircraft.

[0003] The pressure of the hydraulic system, as its key indicator, has a significant impact on the normal operation of the user system. In the design of the aircraft hydraulic system, reducing the pressure shock in the system is of great significance to improving the aircraft's control quality and safety. Therefore, it is necessary to detect the pressure in the system in real time and provide timely feedback when the pressure exceeds the limit. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a pressure switch and method for pipeline pressure monitoring, which can monitor the pressure shock in the aircraft hydraulic system pipeline in real time and provide a feedback signal.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A pressure switch for pipeline pressure monitoring, comprising a housing, an inner cavity and a connecting piece connected in sequence;

[0007] The outer shell is cylindrical, and a target structure is arranged inside the outer shell. The target structure is circular, and the diameter of the target structure is the same as the inner diameter of the outer shell. The target structure is slidably connected to the inner wall of the outer shell, and a permanent magnet is arranged on the side of the target structure facing the inner cavity; the outer shell is nested on the inner cavity, and the inner cavity is located at the end of the outer shell. A spring is nested on the inner cavity, one end of the spring is connected to the inner cavity, and the other end is connected to the side of the target structure facing the inner cavity; a magnetic field detection circuit is arranged inside the inner cavity.

[0008] Preferably, the magnetic field detection circuit includes a Hall switch and a switch conversion circuit connected in sequence.

[0009] Furthermore, the input ends of the Hall switch and the switch conversion circuit are both connected to the output end of the power conversion circuit, and the input end of the power conversion circuit is connected to the power supply.

[0010] Preferably, a nozzle is provided at the other end of the shell connected to the inner cavity.

[0011] Preferably, an O-ring is provided on the outer circle of the target structure, a protective shell is wrapped around the permanent magnet, and a cover plate is provided on the side of the protective shell facing the inner cavity.

[0012] Preferably, a gasket is provided between the connecting piece and the inner cavity.

[0013] Furthermore, the inner cavity and the gasket are connected by slotted screws.

[0014] Preferably, the connecting piece is an electrical connector.

[0015] A pipeline pressure monitoring method based on the pressure switch described in any one of the above items, wherein the pressure switch is installed at the pipeline pressure pipe, the measured medium enters the shell, the target structure is compressed by the spring after being subjected to pressure, and the permanent magnet gradually approaches the magnetic field detection circuit in the inner cavity. When the magnetic field strength detected by the magnetic field detection circuit reaches a first set value, the magnetic field detection circuit outputs a pressure over-limit signal.

[0016] Preferably, after the pipeline pressure drops, when the magnetic field detection circuit outputs a pressure over-limit signal and the pressure in the outer shell gradually decreases, the permanent magnet gradually moves away from the magnetic field detection circuit in the inner cavity, and when the magnetic field strength detected by the magnetic field detection circuit reaches the second set value, the magnetic field detection circuit outputs a pressure non-over-limit signal, and the first set value is greater than the second set value.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention bears pressure through a target structure. According to the pressure size and a spring, the permanent magnet can be moved closer to or farther away from the inner cavity. The magnetic field detection circuit in the inner cavity can detect the magnetic field size. The closer the permanent magnet is to the inner cavity, the greater the magnetic field strength. Therefore, when the magnetic field detection circuit detects that the magnetic field strength exceeds the set magnetic field strength, the pressure exceeds the warning line. The pressure overshoot can be captured quickly and accurately, and an alarm or control signal can be provided, thereby improving the control quality and safety of the aircraft. In addition, the pressure switch is non-contact detection, with low mechanical wear, reliable operation and long service life.

[0019] Furthermore, the Hall switch has its own hysteresis characteristic, and the proximity trigger magnetic field strength does not overlap with the distance trigger magnetic field strength, which effectively avoids the problem of repeated or erroneous output of alarm or control signals caused by pressure fluctuations. By setting the distance trigger magnetic field strength, a signal can be issued when the pressure drops below the safety line.

[0020] Furthermore, the nozzle can ensure the sealing of the liquid flowing into the housing.

[0021] Furthermore, the O-ring, the protective shell and the cover plate can ensure that the liquid will not leak to the permanent magnet side, thereby ensuring the service life of the parts.

[0022] Furthermore, the use of an electrical connector allows for online installation and disassembly, making maintenance easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An exploded view of the pressure switch structure of the present invention;

[0024] Figure 2 It is the principle diagram of the magnetic field detection circuit of the present invention.

[0025] Among them: 1-take nozzle; 2-housing; 3-O-ring; 4-target structure; 5-permanent magnet; 6-cover plate; 7-spring; 8-inner cavity; 9-magnetic field detection circuit; 10-gasket; 11-slotted screw; 12-electrical connector. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0027] like Figure 1 As shown, the pressure switch for pipeline pressure monitoring according to the present invention comprises a housing 2, an inner cavity 8 and a connecting piece which are connected in sequence.

[0028] The outer shell 2 is cylindrical, and the nozzle 1 is fixed at one end of the outer shell 2. A target structure 4 is arranged in the outer shell 2. The target structure 4 is circular, and the diameter of the target structure 4 is the same as the inner diameter of the outer shell 2. It can slide in the outer shell 2, and the target structure 4 is slidably connected to the inner wall of the outer shell 2. A permanent magnet 5 is arranged on the side of the target structure 4 facing the inner cavity 8; the inner cavity 8 is arranged at the other end of the outer shell 2, and the outer shell 2 is nested on the inner cavity 8. A spring 7 is nested on the inner cavity 8, and one end of the spring 7 is connected to the inner cavity 8, and the other end is connected to the side of the target structure 4 facing the inner cavity 8; a magnetic field detection circuit 9 is arranged inside the inner cavity 8.

[0029] like Figure 2 As shown, the magnetic field detection circuit 9 includes a Hall switch and a switch conversion circuit connected in sequence, the input ends of the Hall switch and the switch conversion circuit are connected to the output end of the power conversion circuit, and the input end of the power conversion circuit is connected to the power supply. The Hall switch has its own hysteresis characteristics, and the proximity trigger magnetic field strength does not overlap with the distance trigger magnetic field strength, which effectively avoids the problem of repeated output or erroneous output of alarm or control signals caused by pressure fluctuations. By setting the proximity trigger magnetic field strength, an over-limit signal can be issued when the pressure reaches the warning line, and by setting the distance trigger magnetic field strength, a non-over-limit signal can be issued when the pressure drops below the safety line.

[0030] The outer circle of the target structure 4 is provided with an O-ring 3, which contacts the inner wall of the housing 2. The permanent magnet 5 is wrapped with a protective shell, and a cover plate 6 is provided on the side of the protective shell facing the inner cavity 8. It is ensured that the liquid will not leak to the side of the permanent magnet, and the service life of the parts is guaranteed.

[0031] The side of the inner cavity 8 facing the connector is a square base with a through hole in the middle for placing the magnetic field detection circuit 9. A gasket 10 is provided between the connector and the inner cavity 8. The inner cavity 8 and the gasket 10 are connected by slotted screws 11.

[0032] The connecting piece is an electrical connector 12, one end of which is connected to the magnetic field detection circuit 9, and the other end is connected to an external power supply.

[0033] When the pressure switch of the present invention is used to monitor the pipeline pressure, the approach trigger magnetic field strength and the distance trigger magnetic field strength are set, the approach trigger magnetic field strength is set to the first set value, and the approach trigger magnetic field strength is set to the second set value, and the first set value is greater than the second set value; the pressure switch is installed at the pipeline pressure pipe, the measured medium enters the inside of the shell 2, the target structure 4 is compressed by the spring 7 after being subjected to pressure, and the permanent magnet 5 gradually approaches the magnetic field detection circuit 9 in the inner cavity 8. When the magnetic field strength detected by the magnetic field detection circuit 9 reaches the first set value, the magnetic field detection circuit 9 outputs a pressure over-limit signal. After the magnetic field detection circuit 9 outputs the pressure over-limit signal, and the pressure in the shell 2 gradually decreases, the permanent magnet 5 gradually moves away from the magnetic field detection circuit 9 in the inner cavity 8. When the magnetic field strength detected by the magnetic field detection circuit 9 reaches the second set value, the magnetic field detection circuit 9 outputs a pressure non-over-limit signal.

[0034] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A pressure switch for pipeline pressure monitoring, characterized in that: It comprises an outer shell (2), an inner cavity (8) and a connecting piece which are connected in sequence; The outer shell (2) is cylindrical, a target structure (4) is arranged inside the outer shell (2), the target structure (4) is circular, the diameter of the target structure (4) is the same as the inner diameter of the outer shell (2), the target structure (4) is slidably connected to the inner wall of the outer shell (2), and a permanent magnet (5) is arranged on the side of the target structure (4) facing the inner cavity (8); the outer shell (2) is nested on the inner cavity (8), the inner cavity (8) is located at the end of the outer shell (2), a spring (7) is nested on the inner cavity (8), one end of the spring (7) is connected to the inner cavity (8), and the other end is connected to the side of the target structure (4) facing the inner cavity (8); a magnetic field detection circuit (9) is arranged inside the inner cavity (8); The pipeline pressure monitoring method of the pressure switch is: The pressure switch is installed at the pipeline pressure guide pipe, and the measured medium enters the interior of the housing (2). The target structure (4) compresses the spring (7) after being subjected to pressure, and the permanent magnet (5) gradually approaches the magnetic field detection circuit (9) in the inner cavity (8). When the magnetic field intensity detected by the magnetic field detection circuit (9) reaches a first set value, the magnetic field detection circuit (9) outputs a pressure overlimit signal.

2. The pressure switch for pipeline pressure monitoring according to claim 1, characterized in that: The magnetic field detection circuit (9) comprises a Hall switch and a switch conversion circuit which are connected in sequence.

3. The pressure switch for pipeline pressure monitoring according to claim 2, characterized in that: The input ends of the Hall switch and the switch conversion circuit are both connected to the output end of the power conversion circuit, and the input end of the power conversion circuit is connected to the power supply.

4. The pressure switch for pipeline pressure monitoring according to claim 1, characterized in that: A nozzle (1) is provided at the other end of the outer shell (2) connected to the inner cavity (8).

5. The pressure switch for pipeline pressure monitoring according to claim 1, characterized in that: An O-ring (3) is arranged on the outer circumference of the target structure (4), a protective shell is wrapped around the permanent magnet (5), and a cover plate (6) is arranged on the side of the protective shell facing the inner cavity (8).

6. The pressure switch for pipeline pressure monitoring according to claim 1, characterized in that: A gasket (10) is provided between the connecting piece and the inner cavity (8).

7. The pressure switch for pipeline pressure monitoring according to claim 6, characterized in that: The inner cavity (8) and the gasket (10) are connected by means of slotted screws (11).

8. The pressure switch for pipeline pressure monitoring according to claim 1, characterized in that: The connecting piece is an electric connector (12).

9. The pressure switch for pipeline pressure monitoring according to claim 1, characterized in that: After the pipeline pressure drops, when the magnetic field detection circuit (9) outputs a pressure over-limit signal and the pressure in the housing (2) gradually decreases, the permanent magnet (5) gradually moves away from the magnetic field detection circuit (9) in the inner cavity (8), and when the magnetic field intensity detected by the magnetic field detection circuit (9) reaches a second set value, the magnetic field detection circuit (9) outputs a pressure non-over-limit signal, and the first set value is greater than the second set value.

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