Position sensor

Abstract

A position sensor, including a housing. Inside the left end of the housing, there is a magnetic can. The left end face of the magnetic can is in contact with the inner wall of the housing. Inside the magnetic can, there is a coil fixedly connected. On the right side of the magnetic can, there is a printed circuit board fixedly connected. On the right side surface of the printed circuit board, there are respectively two first lead pads and two second lead pads. There are wire passing holes on the magnetic can and the printed circuit board. The starting wire and the ending wire of the coil are respectively welded to the two first lead pads on the printed circuit board through the wire passing holes. Two wires are respectively connected to the two second lead pads. At the right end of the housing, there is a socket fixedly connected. Inside the socket, there are two pins; the other ends of the two wires are respectively connected to the two pins. The right end of the printed circuit board is connected with a spring, and the right end of the spring abuts against the left end of the socket. The position sensor designed by the present invention has the advantages of small volume, good insulation performance and high sensitivity, and is worthy of promotion.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft position detection devices, and particularly to position sensors. Background Art

[0002] Sensors are an important part of aircraft position detection devices. They are installed in important parts such as aircraft cabin doors to detect the closed position of the cabin doors for the flight control system to determine whether the cabin doors are reliably closed.

[0003] Existing sensors mainly consist of a cover plate, a non-metallic insulating gasket, a coil, an adhesive, a magnetic can, a printed circuit board, a spring, a retaining ring, an elastic retaining ring, and a socket. The connection structure is shown in Figure 1 Due to the installation of a non-metallic insulating gasket, a retaining ring, and an elastic retaining ring, they are large in volume, poor in insulation performance, and low in sensitivity. Summary of the Invention

[0004] The purpose of the present invention is to provide a position sensor to solve the above problems.

[0005] To achieve the above purpose, the following technical solutions are adopted: A position sensor includes a housing. Inside the left end of the housing, there is a magnetic can. The left end face of the magnetic can is in contact with the inner wall of the housing. Inside the magnetic can, a coil is fixedly connected using an adhesive. On the right side of the magnetic can, a printed circuit board is fixedly connected. On the right surface of the printed circuit board, there are respectively two first lead pads and two second lead pads.

[0006] The magnetic can and the printed circuit board are provided with wire passing holes. The start wire and end wire of the coil pass through the wire passing holes and are respectively welded to the two first lead pads on the printed circuit board. Wires are respectively connected to the two second lead pads.

[0007] On the right end of the housing, a socket is fixedly connected. Inside the socket, there are two pins.

[0008] The other ends of the two wires are respectively connected to the two pins to achieve circuit connection.

[0009] On the right end of the printed circuit board, a spring is connected. The right end of the spring abuts against the left end of the socket. Flexible fixation is performed through the spring to prevent internal parts from axially moving under a mechanical environment.

[0010] Preferably, a plurality of bosses are evenly arranged circumferentially on the right end of the magnetic can. On the printed circuit board, card slots are evenly provided. The card slots match the bosses and are fixed using an adhesive to prevent relative rotation or movement between the printed circuit board and the magnetic can.

[0011] Preferably, the housing and the socket are fixedly connected by laser welding to achieve sealing, preventing external objects such as water vapor from entering the interior of the housing and causing a short circuit; at the same time, it limits the internal parts, eliminating the need for retaining rings and snap rings for limiting, thus reducing the length dimension of the product.

[0012] Preferably, a predetermined distance is left between the left end face of the coil and the inner wall of the housing to prevent the coil from contacting the housing and damaging the coil enamel layer, resulting in insulation breakdown, and improving the insulation performance of the product.

[0013] Preferably, a stop washer is provided outside the housing, and a lock washer and a nut are sequentially provided on one side of the stop washer. The stop washer prevents rotation, and the lock washer and the nut are used for fixing and locking, eliminating the need for safety locking, and simplifying the disassembly and assembly operations.

[0014] Preferably, heat shrinkable tubes are sleeved on the start wire and the end wire of the coil respectively.

[0015] Preferably, the magnetic can on the right side of the coil is provided with an annular groove, a lead wire groove is connected to the annular groove, the lead wire groove is arranged along the radial direction of the magnetic can, and the other end of the lead wire groove is communicated with a wire passing hole.

[0016] The beneficial effects achieved by the present invention: For the position sensor proposed by the present invention, since the insulating gasket between the magnetic can and the housing is eliminated, the distance between the magnetic can and the target is reduced, thus effectively improving the induction sensitivity of the product; through the provided spring, it realizes the limitation of the internal parts, and at the same time prevents the internal parts from axially moving under the mechanical environment, and eliminates the need for retaining rings and snap rings for limiting, reducing the length dimension of the product; the provided nut, lock washer and stop washer achieve effective fixation, eliminating the need for safety locking, and simplifying the disassembly and assembly; the coil arranged inside the magnetic can makes a predetermined distance reserved between the coil and the housing and is fixed with an adhesive, preventing the coil from contacting the housing and damaging the coil enamel layer, resulting in insulation breakdown, and improving the insulation performance of the product. Therefore, this position sensor has the advantages of small volume, good insulation performance and high sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a position sensor in the prior art.

[0018] Figure 2 It is a schematic structural diagram of the position sensor of the present invention.

[0019] Figure 3 For Figure 2 The schematic cross-sectional view A-A structure diagram.

[0020] Figure 4 For Figure 2 The schematic cross-sectional view B-B structure diagram.

[0021] In the figure, 1 - coil, 2 - housing, 3 - magnetic can, 4 - heat shrinkable sleeve, 5 - printed circuit board, 6 - spring, 7 - nut, 8 - lock washer, 9 - stop washer, 10 - socket, 11 - wire, 31 - annular groove, 32 - lead groove, 33 - card slot, 51 - wire passing hole, 52 - first lead pad, 53 - second lead pad, 54 - boss. Detailed implementation mode

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0024] Refer to the attached Figures 1-4 The position sensor includes a housing 2. Inside the left end of the housing 2, there is a magnetic can 3. The left end face of the magnetic can 3 is in contact with the inner wall of the housing 2. Inside the magnetic can 3, there is a fixed coil 1. On the right side of the magnetic can 3, there is a fixed printed circuit board 5. On the right side surface of the printed circuit board 5, there are respectively two first lead pads 52 and two second lead pads 53.

[0025] There is a wire passing hole 51 on the magnetic can 3 and the printed circuit board 5. The start wire and end wire of the coil 1 pass through the wire passing hole 51 and are respectively welded to the two first lead pads 52 of the printed circuit board 5. Two wires 11 are respectively connected to the two second lead pads 53.

[0026] The right end of the housing 2 is fixedly connected with a socket 10, and there are two pins inside the socket 10.

[0027] The other ends of the two wires 11 are respectively connected to the two pins to achieve circuit connection.

[0028] The right end of the printed circuit board 5 is connected with a spring 6, and the right end of the spring 6 abuts against the left end of the socket 10; flexible fixation is carried out through the spring 6 to prevent the internal parts from axially moving under the mechanical environment.

[0029] A plurality of bosses 54 are uniformly arranged circumferentially at the right end of the magnetic can 3. The printed circuit board 5 is uniformly provided with card slots 33. The card slots 33 are matched with the bosses 54 and are fixed with an adhesive to prevent the printed circuit board 5 from rotating and moving relative to the magnetic can 3.

[0030] The housing 2 and the socket 10 are fixedly connected by laser welding. Fixed sealing is achieved through laser welding to prevent external objects such as water vapor from entering the interior of the housing and causing a short circuit. At the same time, the internal parts are limited in position, eliminating the need for retaining rings and snap rings for position limitation, thus reducing the length dimension of the product.

[0031] A predetermined distance is left between the left end face of the coil 1 and the inner wall of the housing 2 to prevent the coil 1 from contacting the housing 2 and damaging the coil enamel insulation layer, resulting in insulation breakdown, and improving the insulation performance of the product.

[0032] A stop washer 9 is provided outside the housing 2. A lock washer 8 and a nut 7 are sequentially provided on one side of the stop washer 9. The rotation of the stop washer 9 is prevented, and the lock washer 8 and the nut 7 are used for fixing and preventing loosening, eliminating the need for safety wire for anti-loosening, and simplifying the disassembly and assembly on the machine.

[0033] Heat shrinkable sleeves 4 are respectively sleeved on the start wire and the end wire of the coil 1.

[0034] An annular groove 31 is provided on the magnetic can 3 on the right side of the coil 1. A lead wire groove 32 is connected to the annular groove 31. The lead wire groove 32 is arranged along the radial direction of the magnetic can 3, and the other end of the lead wire groove 32 communicates with a wire threading hole 51, preventing the enameled wire from being scratched and damaged after assembly, and improving the insulation performance.

[0035] Working principle: The sensor seals a set of winding coils in a fully metal housing. When a periodic pulse signal is applied to the winding coils built into the sensor probe, the coils emit a magnetic field outward. When the metal target moves relative to the probe, the magnetic circuit and magnetic resistance of the magnetic field will be affected during this process. When the metal target approaches or the projected area of the probe sensing end face and the metal target end face increases, the magnetic circuit magnetic resistance decreases, and the inductance of the coil inside the probe increases; when the metal target moves away or the projected area of the probe sensing end face and the metal target end face decreases, the magnetic circuit magnetic resistance increases, and the inductance of the coil inside the probe decreases. The aircraft detection circuit identifies the position state of the target by detecting the change in inductance, and indicates the approaching and moving away states of the target with discrete digital signals to determine whether the aircraft cabin door is reliably closed.

[0036] The above description is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A position sensor, comprising a housing (2), characterized in that: Inside the left end of the said housing (2), there is a magnetic canister (3). The left end face of the magnetic canister (3) is in contact with the inner wall of the housing (2). Inside the magnetic canister (3), there is a coil (1) fixedly connected. On the right side of the magnetic canister (3), there is a printed circuit board (5) fixedly connected. On the right side surface of the printed circuit board (5), there are respectively two first lead pads (52) and two second lead pads (53). On the magnetic canister (3) and the printed circuit board (5), there is a wire passing hole (51). The start wire and end wire of the coil (1) are respectively welded to the two first lead pads (52) of the printed circuit board (5) through the wire passing hole (51). Two wires (11) are respectively connected to the two second lead pads (53). On the right end of the housing (2), there is a socket (10) fixedly connected. Inside the socket (10), there are two pins. The other ends of the two wires (11) are respectively connected to the two pins. On the right end of the printed circuit board (5), there is a spring (6) connected. The right end of the spring (6) abuts against the left end of the socket (10). On the magnetic canister on the right side of the coil, there is an annular groove. On the annular groove, there is a lead groove connected. The lead groove is arranged along the radial direction of the magnetic canister. The other end of the lead groove communicates with the wire passing hole.

2. The position sensor according to claim 1, wherein: On the circumferential direction of the right end of the magnetic canister (3), there are evenly arranged a plurality of bosses (54). On the printed circuit board (5), there are evenly arranged card slots (33). The card slots (33) match with the bosses (54) and are fixed using an adhesive.

3. The position sensor according to claim 1, characterized in that: The housing (2) and the socket (10) are fixedly connected through laser welding.

4. The position sensor according to claim 1, characterized in that: There is a predetermined distance left between the left end face of the coil (1) and the inner wall of the housing (2).

5. The position sensor according to claim 1, characterized in that: Outside the housing (2), there is a stop washer (9). On one side of the stop washer (9), there are successively a lock washer (8) and a nut (7).

6. The position sensor according to claim 1, characterized in that: On the start wire and end wire of the coil (1), there are respectively heat shrinkable sleeves (4) sleeved.

Images