Detachable sealing type position sensor

Abstract

The invention relates to the technical field of sensors, in particular to a detachable sealing type position sensor which comprises an internal element, a shell, a mounting seat and a socket, the internal element is mounted in the shell, the socket and the mounting seat are welded into a whole through laser, the mounting seat and the shell are fixed through screws, a first shaft shoulder is arranged on the outer circle face of the shell, and a second shaft shoulder is arranged on the outer circle face of the shell. A second shaft shoulder is arranged on the outer circular face of the installation base, the outer contour line of the section of an annular table on the side, away from the socket, of the installation base is an arc line, the first shaft shoulder is matched with the end face of the second shaft shoulder, and the outer surface of the annular table is tightly matched with the conical face. The mounting base and the shell are connected through the screws, after the screws are fastened, the conical surface of the inner hole of the shell is in close fit with the outer surface of the annular table of the mounting base to achieve metal sealing, the sensor can be detached through mounting of the screws, components in the sensor can be maintained, and the cost for replacing the whole sensor when the interior of the sensor breaks down is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a detachable sealed position sensor. Background Art

[0002] The position sensor is an important part of the aircraft. The position sensor on the aircraft landing gear is used to detect the retraction and extension of the landing gear to determine whether the landing is in place. The existing position sensor is composed of internal components, sockets and shells. The internal components usually include coils, induction components and control circuits. The internal components are installed in the shell, and the control circuit is connected to the socket. The socket and the shell are usually laser welded into one to form a full metal sealing structure to provide protection for the internal components and avoid external interference. It is a product that cannot be disassembled and repaired. If the internal components of the sensor fail, the entire sensor can usually only be replaced, resulting in high costs for using the sensor. Summary of the invention

[0003] In order to solve the problems mentioned in the above background technology, the present invention provides a detachable sealed position sensor to solve the problem that the existing position sensor cannot be disassembled for maintenance.

[0004] The present invention discloses the following technical scheme: a detachable sealed position sensor, comprising an internal component, a shell, a mounting seat and a socket, wherein the internal component is mounted in the shell, the socket and the mounting seat are integrated by laser welding, the mounting seat and the shell are fixed by screws, a first shoulder is provided on the outer cylindrical surface of the shell, a conical surface is formed at the transition point between the inner hole of the shell and the outer end surface of the first shoulder, the conical surface opens to the outside of the shell, a second shoulder is provided on the outer cylindrical surface of the mounting seat, the outer contour line of the annular table section on the side of the mounting seat away from the socket is an arc line, the first shoulder is matched with the end surface of the second shoulder, and the outer surface of the annular table is tightly matched with the conical surface.

[0005] Furthermore, the internal components include an insulating gasket, a coil, a circuit board, a limiting ring, a wave spring, and an elastic retaining ring. The insulating gasket separates the coil from the inner end face of the shell. The circuit board is installed along the axial direction of the shell. The two sides of the circuit board are respectively abutted against the coil and the limiting ring. A wave spring is provided on the side of the limiting ring away from the circuit board, and the wave spring abuts against the elastic retaining ring.

[0006] Furthermore, the deformation of the annular platform during installation is 0.1-0.2 mm, and the outer surface roughness is not less than 0.8 μm.

[0007] Furthermore, the cone surface roughness of the shell is not less than 0.8 μm.

[0008] Furthermore, the screws are circumferentially distributed on the first shoulder and the second shoulder.

[0009] Furthermore, the screw is provided with a fuse.

[0010] Beneficial effect: Compared with the prior art, the present invention welds the mounting base and the socket into one, and connects the mounting base and the shell with screws. After the screws are tightened, the conical surface of the inner hole of the shell and the outer surface of the annular stage of the mounting base are closely matched to achieve metal sealing. The sensor can be disassembled by using screws for installation, and the components inside the sensor can be repaired, thereby reducing the cost of replacing the entire sensor when an internal fault occurs in the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the detachable sealed position sensor of the present invention; Figure 2 It is a schematic diagram of the housing structure of the present invention; Figure 3 It is a schematic diagram of the mounting seat structure of the present invention; In the figure: 1-housing, 2-mounting seat, 3-socket, 4-insulating gasket, 5-coil, 6-circuit board, 7-limiting ring, 8-wave spring, 9-elastic retaining ring, 10-screw, 11-first shoulder, 12-conical surface, 21-second shoulder, 22-annular platform. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] Implementation example Figure 1 to Figure 2 As shown: a detachable sealed position sensor, including an internal component, a shell 1, a mounting seat 2 and a socket 3, the internal component is installed in the shell 1, the socket 3 and the mounting seat 2 are integrated by laser welding, the mounting seat 2 and the shell 1 are fixed by screws 10, the outer cylindrical surface of the shell 1 is provided with a first shoulder 11, the transition between the inner hole of the shell 1 and the outer end surface of the first shoulder 11 is a conical surface 12, the conical surface 12 is open to the outside of the shell 1, the outer cylindrical surface of the mounting seat 2 is provided with a second shoulder 21, the mounting seat 2 is away from the socket 3 side of the annular The outer contour line of the cross section of the platform 22 is an arc line. When the mounting seat 2 is connected to the shell 1, the annular platform 22 extends into the inner hole of the shell 1, and the highest point of the outer surface of the annular platform 22 cooperates with the conical surface 12 of the shell 1. As the screw 10 is tightened, the mounting seat 2 moves toward the shell 1 along the axial direction, and the first shoulder 11 cooperates with the end surface of the second shoulder 21. Since the wall thickness at the conical surface 12 is greater than the wall thickness of the annular platform 22, the conical surface 12 gradually narrows inward, and the annular platform 22 is squeezed and radially deformed to cooperate closely with the conical surface 12 to achieve a metal sealing effect.

[0014] The internal components include an insulating gasket 4, a coil 5, a circuit board 6, a limiting ring 7, a wave spring 8, and an elastic retaining ring 9. The insulating gasket 4 separates the coil 5 from the inner end face of the shell 1 to prevent the coil 5 from contacting the end face of the shell 1 and affecting the sensing accuracy. The circuit board 6 is installed along the axial direction of the shell 1. The two sides of the circuit board 6 are respectively abutted against the coil 5 and the limiting ring 7. The limiting ring 7 limits the circuit board 6. A wave spring 8 is provided on the side of the limiting ring 7 away from the circuit board 6. The wave spring 8 has an axial buffering effect on the limiting ring 7. The wave spring 8 abuts against the elastic retaining ring 9, and the elastic retaining ring 9 limits the axial direction of the wave spring 8.

[0015] The deformation of the annular platform 22 during installation is 0.1mm~0.2mm, and the outer surface roughness is not less than 0.8μm to ensure the sealing effect; the conical surface 12 of the shell 1 has a roughness of not less than 0.8μm to ensure the sealing effect; the screws 10 are circumferentially distributed at the first shoulder 11 and the second shoulder 21, and the force is evenly applied during installation to ensure that the shell 1 and the mounting seat 2 are coaxial; a fuse is provided on the screw 10 to prevent the screw 10 from loosening.

[0016] The specific implementation process is as follows: when the mounting seat 2 is installed with the shell 1, the annular platform 22 of the mounting seat 2 extends into the inner hole of the shell 1, and the outer surface of the annular platform 22 cooperates with the conical surface 12 of the inner hole of the shell 1, and bolts are installed at the first shoulder 11 and the second shoulder 21. As the bolts are tightened, the mounting seat 2 and the shell 1 are close, and the end faces of the first shoulder 11 and the second shoulder 21 cooperate. Since the conical surface 12 gradually narrows inward, the wall thickness at the conical surface 12 is greater than the wall thickness at the annular platform 22. The annular platform 22 is squeezed to cause radial deformation of 0.1mm to 0.2mm, so that it is closely matched with the conical surface 12, and the roughness of the outer surface of the annular platform 22 and the conical surface 12 is not less than 0.8μm, and the sealing effect is good. If the electronic components inside the sensor fail, the shell 1 and the mounting seat 2 can be separated by removing the screws 10, and the faulty components in the shell 1 can be taken out for repair.

[0017] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A detachable sealed position sensor, comprising an internal element, a shell (1), a mounting seat (2) and a socket (3), wherein the internal element is mounted in the shell (1), the socket (3) and the mounting seat (2) are integrated by laser welding, the mounting seat (2) and the shell (1) are fixed by screws (10), a first shoulder (11) is provided on the outer circumferential surface of the shell (1), a conical surface (12) is formed at the transition point between the inner hole of the shell (1) and the outer end surface of the first shoulder (11), the conical surface (12) is open to the outside of the shell (1), a second shoulder (21) is provided on the outer circumferential surface of the mounting seat (2), the outer contour line of the cross section of the annular platform (22) on the side of the mounting seat (2) away from the socket (3) is an arc line, the first shoulder (11) and the second shoulder (21) are matched at the end surface, and the outer surface of the annular platform (22) is tightly matched with the conical surface (12).

2. The detachable sealed position sensor according to claim 1, characterized in that: The internal components include an insulating gasket (4), a coil (5), a circuit board (6), a limiting ring (7), a wave spring (8), and an elastic retaining ring (9). The insulating gasket (4) separates the coil (5) from the inner end surface of the housing (1). The circuit board (6) is installed along the axial direction of the housing (1). Both sides of the circuit board (6) are respectively in contact with the coil (5) and the limiting ring (7). A wave spring (8) is provided on the side of the limiting ring (7) away from the circuit board (6). The wave spring (8) is in contact with the elastic retaining ring (9).

3. The detachable sealed position sensor according to claim 1, characterized in that: The annular platform (22) has a deformation amount of 0.1 to 0.2 mm during installation, and an outer surface roughness of not less than 0.8 μm.

4. The detachable sealed position sensor according to claim 1, characterized in that: The roughness of the conical surface (12) of the shell (1) is not less than 0.8 μm.

5. The detachable sealed position sensor according to claim 1, characterized in that: The screws (10) are circumferentially distributed on the first shoulder (11) and the second shoulder (21).

6. The detachable sealed position sensor according to claim 1, characterized in that: The screw (10) is provided with a fuse.

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