Pressure sensor with wide-range buffer mechanism

Abstract

The invention provides a pressure sensor with a wide-range buffer mechanism, and the sensor comprises a housing which is provided with an inner cavity; one end of the pipe joint is connected with one end of the shell, and a multilayer board buffer is arranged in the other end of the pipe joint; the pressure core body is arranged at the other end of the pipe joint and is positioned in the inner cavity; and the circuit board is connected with the shell and the pressure core body. And the multi-layer plate buffer is installed through threads, so that the multi-layer plate buffer is convenient to disassemble and maintain. The number of laminates of the buffer can be set according to actual working conditions, protection of a sensitive diaphragm of the pressure sensor in the pressure sudden change process is achieved, and the use requirements for reliability and safety of the wide-range pressure sensor of the airborne hydraulic system are met.

Description

Technical Field

[0001] The invention relates to the technical field of airborne aviation large-range pressure sensor testing and control, and in particular to a pressure sensor with a large-range buffer mechanism. Background Art

[0002] In the airborne hydraulic system, the airborne electro-hydraulic servo system and the airborne hydraulic transmission system are responsible for the aircraft control system, retraction system, wheel brakes and ground steering, which are extremely important for the safe flight and landing of the aircraft. In the hydraulic system, multiple large-range pressure sensors are installed to monitor the medium pressure in the landing gear and door retraction pipelines, and transmit the pressure signal to the flight control system. The medium pressure of the system is generally ≥25MPa.

[0003] Since the airborne hydraulic system is closely related to flight safety and landing, the reliability and stability requirements for the sensors supporting the system are extremely high. Especially at the moment of aircraft landing, the instantaneous and overload pressure of the landing gear hydraulic system often exceeds the full-range pressure by 1.5 to 2 times, accompanied by pressure transients, pulse pressures and pressure mutations, which puts forward higher requirements for the impact and overload of the sensitive diaphragm of the pressure sensor. This requires the design of a buffer mechanism at the position of the pressure sensor probe to protect the sensitive diaphragm of the pressure sensor during the pressure mutation process. Summary of the invention

[0004] In view of this, the present invention provides a pressure sensor with a large-range buffer mechanism to protect the sensitive diaphragm of the pressure sensor during sudden pressure changes, thereby meeting the reliability and safety requirements of the large-range pressure sensor of the airborne hydraulic system.

[0005] The present invention provides the following technical solution: a pressure sensor with a large-range buffer mechanism, comprising: a shell, which is provided with an inner cavity; a pipe joint, one end of which is connected to one end of the shell, and a multilayer board buffer is provided in the other end of the pipe joint; a pressure core, which is arranged at the other end of the pipe joint and is located in the inner cavity; and a circuit board, which is connected to the shell and the pressure core.

[0006] Furthermore, the circuit board is arranged in the inner cavity, and the circuit board is connected to the pressure core through a cable.

[0007] Furthermore, the pressure sensor with a large-range buffer mechanism also includes a socket, which is arranged at the other end of the shell, and the socket is connected to the circuit board through a cable.

[0008] Furthermore, the multilayer board buffer includes: a shell provided with a buffer cavity; a plurality of gasket groups arranged in the buffer cavity; and a joint connected to the shell and pressing the plurality of gasket groups.

[0009] Furthermore, the gasket set includes a first gasket, a second gasket and a third gasket which are arranged in sequence.

[0010] Furthermore, the thickness of the first gasket is 0.1 mm, and a circular hole with a diameter of 0.8 mm is arranged at the center of the first gasket; the thickness of the second gasket is 0.4 mm, and a circular hole with a diameter of 1.5 mm is arranged at the center of the second gasket; the thickness of the third gasket is 0.1 mm, and two circular holes with a diameter of 0.5 mm are arranged in the middle of the third gasket, and the two circular holes with a diameter of 0.5 mm are symmetrically arranged relative to the center of the third gasket.

[0011] Furthermore, a second gasket is arranged between two adjacent gasket groups.

[0012] Furthermore, the number of gasket groups is 5-15 groups.

[0013] Compared with the prior art, the beneficial effects achieved by at least one of the above technical solutions adopted by the present invention include at least: by installing a multi-layer buffer, the multi-layer buffer is installed by threads, which is easy to disassemble and maintain. The number of layers of the buffer can be set according to the actual working conditions, so as to protect the sensitive diaphragm of the pressure sensor during the sudden pressure change, and meet the reliability and safety requirements of the large-range pressure sensor of the airborne hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the pressure sensor of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the multilayer board buffer of the present invention;

[0017] Figure 3 It is a schematic diagram of the structure of the gasket in the multilayer board buffer of the present invention;

[0018] Figure 4 This is a comparison chart of the simulation results of the pressure buffer effect.

[0019] The reference numerals in the figure are: 1. multilayer board buffer; 2. pipe joint; 3. pressure core; 4. circuit board; 5. housing; 6. socket; 11. shell; 12. joint; 13. first gasket; 14. second gasket; 15. third gasket. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] like Figures 1 to 3 As shown, an embodiment of the present invention provides a pressure sensor with a large-range buffer mechanism, comprising: a housing 5, a pipe joint 2, a pressure core 3 and a circuit board 4. The housing 5 is provided with an inner cavity; one end of the pipe joint 2 is connected to one end of the housing 5, and a multilayer board buffer 1 is provided in the other end of the pipe joint 2; the pressure core 3 is provided at the other end of the pipe joint 2 and is located in the inner cavity; the circuit board 4 is connected to the housing 5 and the pressure core 3.

[0023] By installing the multi-layer buffer 1, the multi-layer buffer 1 is installed by threading, which is convenient for disassembly and maintenance. The number of layers of the buffer can be set according to the actual working conditions, so as to realize the protection of the sensitive diaphragm of the pressure sensor during the sudden pressure change process, and meet the reliability and safety requirements of the large-range pressure sensor of the airborne hydraulic system.

[0024] The circuit board 4 is arranged in the inner cavity, and the circuit board 4 is connected to the pressure core 3 through a cable.

[0025] The pressure sensor with a large-range buffer mechanism further includes a socket 6 , which is disposed at the other end of the housing 5 , and the socket 6 is connected to the circuit board 4 through a cable.

[0026] It should be noted that the pressure core 3 is first sealed and fixed by laser welding, and the weld penetration depth needs to be ≥1 mm to avoid weld failure under large pressure pulses.

[0027] like Figure 2 As shown, the multilayer board buffer 1 in the embodiment of the present invention comprises a housing 11, multiple gasket groups and a joint 12. The housing 11 is provided with a buffer cavity; the multiple gasket groups are arranged in the buffer cavity; the joint 12 is connected to the housing 11 and compresses the multiple gasket groups.

[0028] The material of all components in the multilayer board buffer 1 is 316L stainless steel. The total external length of the multilayer board buffer 1 is 15±0.1mm, and the external diameter is an M4×0.5-6h external thread structure.

[0029] like Figure 3As shown, the gasket set includes a first gasket 13, a second gasket 14 and a third gasket 15 which are arranged in sequence. The first gasket 13 has a thickness of 0.1 mm, and a circular hole with a diameter of 0.8 mm is arranged at the center of the first gasket 13; the second gasket 14 has a thickness of 0.4 mm, and a circular hole with a diameter of 1.5 mm is arranged at the center of the second gasket 14; the third gasket 15 has a thickness of 0.1 mm, and two circular holes with a diameter of 0.5 mm are arranged in the middle of the third gasket 15, and the two circular holes with a diameter of 0.5 mm are arranged symmetrically relative to the center of the third gasket 15.

[0030] It should be noted that the stacking order of the gaskets in the gasket group in the embodiment of the present invention can only be stacked in the order of the first gasket 13, the second gasket 14 to the third gasket 15. Ten groups are arranged in sequence inside the buffer, and can also be designed into 5 groups or 15 groups according to actual buffering requirements. The more groups, the better the buffering effect, but the longer the response time to the pressure, so it is generally designed to be 10 groups as the best.

[0031] Furthermore, a second gasket 14 is arranged between two adjacent gasket groups.

[0032] After the buffer is assembled, the multilayer board buffer 1 is screwed into the bottom of the pipe joint 2 using a flat-blade screwdriver through the M4×0.5-6h external thread structure. Figure 1 As shown, the installation and fixation of the multilayer board buffer 1 is completed.

[0033] In order to verify the sensor's ability to resist pressure pulses and mutations, a transient fluid analysis is performed on the sensor to obtain the pressure change process of the sensor's pressure core test surface over time, and the pressure acting on the pressure core test surface at each time step is dynamically monitored. The results are recorded every 1ms during the calculation process, such as Figure 4 As shown, the left side is the simulation result of the pressure buffering effect with the multilayer board buffer 1 installed, and the right side is the simulation result of the pressure buffering effect without the multilayer board buffer 1 installed. It can be seen that when the pressure mutation is applied at the 10th ms, the pressure change amplitude of the sensor installed with the multilayer board buffer 1 is more relaxed, proving that it has a good buffering effect.

[0034] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with each other, and with each other.

Claims

1. A pressure sensor with a large-range buffer mechanism, characterized in that: include: A housing (5) having an inner cavity; A pipe joint (2) has one end connected to one end of the housing (5), and a multilayer board buffer (1) is disposed in the other end of the pipe joint (2); A pressure core (3) is arranged at the other end of the pipe joint (2) and is located in the inner cavity; The circuit board (4) is connected to the housing (5) and the pressure core (3).

2. The pressure sensor with a large-range buffer mechanism according to claim 1, characterized in that: The circuit board (4) is arranged in the inner cavity, and the circuit board (4) is connected to the pressure core (3) via a cable.

3. The pressure sensor with a large-range buffer mechanism according to claim 2, characterized in that: The pressure sensor with a large-range buffer mechanism also includes a socket (6), which is arranged at the other end of the housing (5), and the socket (6) is connected to the circuit board (4) via a cable.

4. The pressure sensor with a large-range buffer mechanism according to any one of claims 1 to 3, characterized in that: The multilayer board buffer (1) comprises: The housing (11) is provided with a buffer chamber; A plurality of gasket groups are arranged in the buffer cavity; The joint (12) is connected to the housing (11) and presses the plurality of gasket groups.

5. The pressure sensor with a large-range buffer mechanism according to claim 4, characterized in that: The gasket set comprises a first gasket (13), a second gasket (14) and a third gasket (15) which are arranged in sequence.

6. The pressure sensor with a large-range buffer mechanism according to claim 5, characterized in that: The thickness of the first gasket (13) is 0.1 mm, and a circular hole with a diameter of 0.8 mm is provided at the center of the first gasket (13); The thickness of the second gasket (14) is 0.4 mm, and a circular hole with a diameter of 1.5 mm is provided at the center of the second gasket (14); The thickness of the third gasket (15) is 0.1 mm, and two circular holes with a diameter of 0.5 mm are arranged in the middle of the third gasket (15), and the two circular holes with a diameter of 0.5 mm are symmetrically arranged relative to the center of the third gasket (15).

7. The pressure sensor with a large-range buffer mechanism according to claim 6, characterized in that: A second gasket (14) is arranged between two adjacent gasket groups.

8. The pressure sensor with a large-range buffer mechanism according to claim 5, characterized in that: The number of the gasket groups is 5-15 groups.

Images