Magnetic traction waterproof linear displacement sensor

Abstract

The utility model relates to a magnetic traction waterproof linear displacement sensor, which comprises a shell, a sealing end cover, a connector socket, a pilot sliding block, a follow-up sliding block, a carbon film resistor circuit board, a universal connector and a traction rod, a first sliding rail is arranged at the upper end of the outer part of the shell, and the pilot sliding block slides back and forth along the first sliding rail of the shell. The guide sliding block is connected with one end of the traction rod through a universal connector, the other end of the traction rod is used for being connected with a detected unit, a second sliding rail is arranged in the shell, the follow-up sliding block slides back and forth along the second sliding rail of the shell, and the carbon film resistor circuit board is arranged in the shell. A sliding brush electrically connected with the carbon film resistor circuit board is installed at one end of the follow-up sliding block, and the two ends of the shell are sealed through sealing end covers. According to the invention, the body can be completely sealed while various performances of the original pull rod type displacement sensor are maintained. And damage caused by a humid environment is avoided. Meanwhile, the structure is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of displacement sensors, and particularly relates to a magnetic traction waterproof linear displacement sensor. Background Art

[0002] At present, for the opening feedback sampling sensors commonly used in small and medium-sized power stations in China for water turbine guide vanes (or needle nozzles), pull rod displacement sensors are basically adopted, such as Chinese Patent CN302915992S (ZL2014301274141) and Chinese Patent CN203518935U (ZL2013206041839).

[0003] Due to the harsh use environment (the environment around the water turbine is humid, and at the same time, the low-temperature pressurized water flowing inside the water turbine can easily cause condensate on the surface of the pull rod and the shell of the displacement sensor. The condensate will gradually enter the inside of the sensor and damage the internal components. In addition, the leakage and splashing water of the water turbine will cause the conventional displacement sensor to be damaged by water ingress and moisture).

[0004] If a magnetostrictive displacement sensor is adopted, the cost is relatively high, and there is a complex conversion circuit in the middle of signal transmission, such as Chinese Utility Model Patent CN202149749U. Due to various harmonic interferences in the power station environment, its use also has unreliability.

[0005] At present, small hydropower centralized control projects are being comprehensively carried out in China to improve the degree of automation. There are further requirements for the service life and stability of components. At the same time, small power stations are limited by funds and cannot adopt high-price components. Therefore, low-cost and highly reliable components are needed. Content of the Utility Model

[0006] Aiming at the deficiencies of the prior art, the utility model aims to provide a magnetic traction waterproof linear displacement sensor, which can completely seal the body while retaining the various performances of the original pull rod displacement sensor, and prevent damage caused by a humid environment.

[0007] The utility model is realized through the following technical solutions.

[0008] A magnetic traction waterproof linear displacement sensor, comprising a housing, a sealing end cover, a connector socket, a pilot slider, a follower slider, a carbon film resistor circuit board, a universal joint, and a traction rod. A first slide rail is provided at the upper end of the outer part of the housing. The pilot slider slides back and forth along the first slide rail of the housing. The pilot slider is connected to one end of the traction rod through a universal joint. The other end of the traction rod is used to connect the unit to be detected. A second slide rail is provided inside the housing. The follower slider slides back and forth along the second slide rail of the housing. The carbon film resistor circuit board is arranged inside the housing. One end of the follower slider is equipped with a sliding brush electrically connected to the carbon film resistor circuit board. Both ends of the housing are sealed with sealing end covers. A connector socket is provided on one of the sealing end covers. The connector socket is electrically connected to the carbon film resistor circuit board;

[0009] Five magnets are provided inside the pilot slider. One of them is the central magnet of the pilot slider, and four are the annular magnets of the pilot slider. The annular magnets of the pilot slider are arranged circumferentially around the central magnet of the pilot slider. The annular magnets of the pilot slider and the central magnet of the pilot slider have opposite polarities; A central magnet of the follower slider is provided in the middle of the follower slider. The central magnet of the pilot slider and the central magnet of the follower slider have opposite polarities.

[0010] Furthermore, the first slide rail is a long groove provided at the upper ends of both sides of the outer part of the housing. Hooks matching the long groove are provided on both sides of the bottom of the pilot slider.

[0011] Furthermore, the second slide rail is a semi-circular convex guide rail. The semi-circular convex guide rail is provided on both sides inside the housing. Semi-circular grooves matching the second slide rail are provided on both sides of the follower slider. Wear-resistant nylon bushings are embedded in the semi-circular grooves.

[0012] Furthermore, the carbon film resistor circuit board is a long strip-shaped carbon film resistor circuit board. The length of the carbon film resistor circuit board is slightly less than the length of the housing.

[0013] Furthermore, a sealing gasket is further included. The sealing end covers seal both ends of the housing through the sealing gasket.

[0014] Furthermore, the annular magnets of the pilot slider, the central magnet of the pilot slider, and the central magnet of the follower slider are all cylindrical strong magnets.

[0015] Furthermore, the sliding brush on the follower slider is a precious metal multi-tentacle sliding brush with elastic damping.

[0016] Furthermore, the housing is an aluminum housing, preferably hard anodized aluminum.

[0017] Furthermore, an installation groove is provided on the lower side of the housing for fixing the magnetic traction waterproof linear displacement sensor using an installation clip.

[0018] Furthermore, the universal joint is a spherical universal joint.

[0019] Compared with the prior art, the advantages of the present utility model are as follows: compared with the existing pull-rod type displacement sensor, while retaining the performance of the original pull-rod type displacement sensor, the present invention enables the body to be completely sealed, preventing damage caused by a humid environment. At the same time, the invention has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is an exploded view of the present utility model;

[0022] Figure 3 is a schematic diagram of the pilot slider and the follower slider of the present utility model;

[0023] In the figure: 1, housing; 2, sealing end cover; 3, sealing gasket; 4, connector socket; 5, pilot slider; 6, follower slider; 7, carbon film resistor circuit board; 8, universal joint; 9, traction rod;

[0024] 101, first slide rail; 102, second slide rail; 103, installation groove.

[0025] 501, central magnet of the pilot slider; 502, annular magnet of the pilot slider; 503, convex hook;

[0026] 601, central magnet of the follower slider; 602, wear-resistant nylon bearing bush; 603, semi-circular groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but it is not limited to the present utility model.

[0028] As Figures 1 to 3 shown, a magnetic traction waterproof linear displacement sensor includes a housing 1, a sealing end cover 2, a connector socket 4, a pilot slider 5, a follower slider 6, a carbon film resistor circuit board 7, a universal joint 8, and a traction rod 9. A first slide rail 101 is provided at the upper end of the outer part of the housing 1. The pilot slider 5 slides back and forth along the first slide rail 101 of the housing 1. The pilot slider 5 is connected to one end of the traction rod 9 through the universal joint 8. The other end of the traction rod 9 is used to connect to a detection unit (not shown in the figure). A second slide rail 102 is provided inside the housing 1. The follower slider 6 slides back and forth along the second slide rail 102 of the housing 1. The carbon film resistor circuit board 7 is arranged inside the housing 1. One end of the follower slider 6 is equipped with a sliding brush (not shown in the figure) electrically connected to the carbon film resistor circuit board 7. Both ends of the housing 1 are sealed with the sealing end cover 2. A connector socket 4 is arranged on one of the sealing end covers 2. The connector socket 4 is electrically connected to the carbon film resistor circuit board 7;

[0029] There are five magnets inside the pilot slider 5, one of which is the pilot slider central magnet 501, and four are the pilot slider annular magnets 502. The pilot slider annular magnets 502 are arranged circumferentially around the pilot slider central magnet 501, and the polarities of the pilot slider annular magnets 502 and the pilot slider central magnet 501 are opposite; there is a follower slider central magnet 601 in the middle of the follower slider 6, and the polarities of the pilot slider central magnet 501 and the follower slider central magnet 601 are opposite. The pilot slider central magnet 501 and the follower slider central magnet 601 form an attractive force, and the four pilot slider annular magnets 502 and the follower slider central magnet 601 form a deflecting repulsive force. The central attractive force and the surrounding deflecting repulsive force make the positioning of the follower slider central magnet 601 reliable, eliminate the magnetic attraction dead zone, and ensure that the follower slider and the pilot slider move completely synchronously.

[0030] Further, the first slide rail 101 is a long groove provided at the upper ends of both sides outside the housing 1, and convex hooks 503 are provided on both sides of the bottom of the pilot slider 5 to cooperate with the long groove.

[0031] Further, the second slide rail 102 is a semi-circular convex guide rail, and the semi-circular convex guide rail is provided on both sides inside the housing 1. Semi-circular grooves 603 are provided on both sides of the follower slider 6 to cooperate with the second slide rail 102, and wear-resistant nylon bearings are embedded in the semi-circular grooves 603 to ensure free and easy sliding of the slider.

[0032] Further, the carbon film resistor circuit board 7 is a long carbon film resistor circuit board, and the length of the carbon film resistor circuit board 7 is slightly less than the length of the housing 1.

[0033] Further, a sealing gasket 3 is also included, and the sealing end cover 2 seals both ends of the housing 1 through the sealing gasket 3 for waterproofing.

[0034] Further, the pilot slider annular magnets 502, the pilot slider central magnet 501, and the follower slider central magnet 601 are all cylindrical strong magnets.

[0035] Further, the brush on the follower slider 6 is a precious metal multi-tentacle brush with elastic damping.

[0036] Further, the housing 1 is an aluminum housing, preferably hard anodized aluminum.

[0037] Further, an installation groove 103 is provided on the lower side of the housing 1 for fixing the magnetic traction waterproof linear displacement sensor using an installation card.

[0038] Further, the universal joint 8 is a spherical universal joint. The universal joint can automatically correct the deviation.

[0039] This sensor is a resistance output type (power supply 0 ~ 30V, the output voltage changes with the displacement of the follower slider), and the signal can also be converted into a standard 0-5V, 0-10V or 4-20mA DC signal through a built-in or external V / A transmitter module to meet the requirements of long-distance transmission control.

[0040] The sensor is installed at the fixed part of the guide vane servomotor. The traction rod connects the guide vane and the connecting part of the servomotor piston rod. When the guide vane moves, the follower slider follows the movement and outputs a corresponding variable voltage.

[0041] Working principle: The magnetic traction waterproof linear displacement sensor is fixedly installed in a suitable position, the traction rod 9 is connected to the detected unit, and the connector socket 4 is electrically connected to the power supply unit and the signal detection unit. When the detected unit moves, the traction rod 9 is driven by the detected unit, thereby driving the leading slider 5 to slide along the slide rail 101 of the shell 1. The leading slider 5 drives the follower slider 6 to slide along the slide rail 2 102 of the shell 1 through the leading slider annular magnet 502, the leading slider center magnet 501 and the follower slider center magnet 601. The relative position of the brush of the follower slider 6 and the carbon film resistor circuit board 7 changes, which changes the resistance of the carbon film resistor circuit board 7, and then outputs different voltages through the connector socket 4.

[0042] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic traction waterproof linear displacement sensor, characterized in that, It includes a housing (1), a sealing end cover (2), a connector socket (4), a pilot slider (5), a follower slider (6), a carbon film resistor circuit board (7), a universal joint (8), and a traction rod (9). On the upper end of the outer part of the housing (1), there is a first slide rail (101). The pilot slider (5) slides back and forth along the first slide rail (101) of the housing (1). The pilot slider (5) is connected to one end of the traction rod (9) through the universal joint (8). The other end of the traction rod (9) is used to connect the unit to be detected. Inside the housing (1), there is a second slide rail (102). The follower slider (6) slides back and forth along the second slide rail (102) of the housing (1). The carbon film resistor circuit board (7) is arranged inside the housing (1). One end of the follower slider (6) is equipped with a sliding brush electrically connected to the carbon film resistor circuit board (7). Both ends of the housing (1) are sealed with the sealing end cover (2). A connector socket (4) is arranged on one of the sealing end covers (2), and the connector socket (4) is electrically connected to the carbon film resistor circuit board (7); There are five magnets inside the pilot slider (5). One is the pilot slider central magnet (501), and four are the pilot slider annular magnets (502). The pilot slider annular magnets (502) are arranged circumferentially around the pilot slider central magnet (501). The pilot slider annular magnets (502) and the pilot slider central magnet (501) have opposite polarities. In the middle of the follower slider (6), there is a follower slider central magnet (601). The pilot slider central magnet (501) and the follower slider central magnet (601) have opposite polarities.

2. The magnetic traction waterproof linear displacement sensor according to claim 1, wherein The first slide rail (101) is a long strip-shaped groove arranged on the upper ends of both sides of the outer part of the housing (1). On both sides of the bottom of the pilot slider (5), there are hooks (503) that match the long strip-shaped groove.

3. The magnetic traction waterproof linear displacement sensor according to claim 1, wherein The second slide rail (102) is a semi-circular convex guide rail. The semi-circular convex guide rail is arranged on both sides inside the housing (1). On both sides of the follower slider (6), there are semi-circular grooves (603) that match the second slide rail (102). The semi-circular grooves (603) are inlaid with wear-resistant nylon bearing bushes.

4. The magnetic traction waterproof linear displacement sensor according to claim 1, wherein The carbon film resistor circuit board (7) is a long strip-shaped carbon film resistor circuit board. The length of the carbon film resistor circuit board (7) is slightly less than the length of the housing (1).

5. The magnetic traction waterproof linear displacement sensor according to claim 1, wherein It also includes a sealing gasket (3). The sealing end cover (2) seals both ends of the housing (1) through the sealing gasket (3).

6. The magnetic traction waterproof linear displacement sensor according to claim 1, characterized in that, The pilot slider annular magnets (502), the pilot slider central magnet (501), and the follower slider central magnet (601) are all cylindrical strong magnets.

7. The magnetic traction waterproof linear displacement sensor according to claim 1, wherein The sliding brush on the follower slider (6) is a precious metal multi-tentacle sliding brush with elastic damping.

8. The magnetic traction waterproof linear displacement sensor according to claim 1, wherein The housing (1) is an aluminum housing.

9. The magnetic traction waterproof linear displacement sensor according to claim 1, characterized in that There is an installation groove (103) on the lower side of the housing (1).

10. The magnetic traction waterproof linear displacement sensor according to claim 1, characterized in that, The universal joint (8) is a spherical universal joint.

Images