Non-contact proximity switch and valve position indicating system

Abstract

The embodiment of the present application provides a kind of non-contact proximity switch and valve position indicating system.Therein, non-contact proximity switch includes: shell;Contact seat, including first static contact, second static contact and rotatable movable contact arc plate, and the both ends of movable contact arc plate are respectively provided with first static contact and second static contact.Elastic component is rotatably arranged in shell, and part of elastic component is pressed movable contact arc plate and can slide on the surface of movable contact arc plate.Drive component, including movable magnetic part, fixed magnetic part, connecting shaft and connecting rod.The valve position indicating system provided by the present application includes valve, support, electrical connection, indicator and the above-mentioned proximity switch, and the target for attracting movable magnetic part is arranged on the valve stem of valve.The proximity switch provided by the present application, elastic component is pressed first movable static contact and first static contact or second movable static contact and second static contact in contact state, and it will not cause contact misoperation phenomenon in high vibration environment.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to switch control technology, in particular to a non-contact proximity switch and valve position indication system. BACKGROUND

[0002] The non-contact proximity switch is a position switch capable of outputting a switch signal without contacting external components, and the proximity switch changes a state to output a switch signal when a target is less than or greater than a motion threshold from an inductive surface of the switch. The existing non-contact proximity switch directly drives a switch contact by using a magnetic component, and the magnetic component and the contact are connected by steel. When there is vibration in the working environment (especially when the proximity switch is installed in a pipeline or other high-vibration environment), the vibration of the magnetic component will cause the proximity switch to malfunction and generate a false signal. SUMMARY

[0003] The embodiment of the present application provides a non-contact proximity switch, which solves the problem that the vibration of the magnetic component will cause the proximity switch to malfunction and generate a false signal when there is vibration in the working environment.

[0004] According to an aspect of the embodiment of the present application, a non-contact proximity switch is provided, comprising:

[0005] A shell comprising an open end and a closed end;

[0006] A contact seat arranged in the shell and fixedly connected with the shell, the contact seat being close to the open end of the shell; the contact seat comprising a first static contact, a second static contact and a rotatable dynamic contact arc-shaped plate extending towards the closed end of the shell, the first static contact and the second static contact being arranged at intervals, and the dynamic contact arc-shaped plate having a first dynamic contact and a second dynamic contact arranged at two ends thereof respectively;

[0007] An elastic component rotatably arranged in the shell and having a rotation axis perpendicular to an axis of the shell, a part of the elastic component being pressed against the dynamic contact arc-shaped plate and being capable of sliding on a surface of the dynamic contact arc-shaped plate to drive the dynamic contact arc-shaped plate to switch between a position where the first dynamic contact contacts the first static contact and a position where the second dynamic contact contacts the second static contact;

[0008] The drive assembly comprises a movable magnetic part, a fixed magnetic part, a connecting shaft and a connecting rod. The fixed magnetic part is fixed in the shell. The movable magnetic part is arranged in the shell and between the closed end of the shell and the fixed magnetic part, and the movable magnetic part is movable along the axial direction of the shell in the shell. The first end of the connecting shaft is fixedly connected with the movable magnetic part. The second end of the connecting shaft is hingedly connected with the first end of the connecting rod through the fixed magnetic part. The second end of the connecting rod is hingedly connected with the elastic assembly.

[0009] In an optional implementation, the contact seat further comprises a support between the first static contact and the second static contact. One end of the support towards the closed end of the shell is connected with the movable contact arc-shaped plate. The movable contact arc-shaped plate is rotatable around the connection point with the support. When the part of the movable contact arc-shaped plate pressed by the elastic assembly passes the connection point of the movable contact arc-shaped plate with the support, the movable contact arc-shaped plate rotates to change the state of the proximity switch.

[0010] In an optional implementation, the connection point of the movable contact arc-shaped plate with the support is located at the midpoint of the movable contact arc-shaped plate; and / or,

[0011] The contact seat further comprises three contact pins and a base. Two of the three contact pins form the first static contact and the second static contact towards the end of the movable contact arc-shaped plate. The other contact pin is fixedly connected with the support towards the end of the movable contact arc-shaped plate.

[0012] In an optional implementation, the elastic assembly comprises a spring seat and an elastic part. The spring seat is arranged in the shell and is hingedly connected with the shell. The spring seat is rotatable around the connection point with the shell. The rotation axis of the spring seat is perpendicular to the axis of the shell. The second end of the connecting rod is hingedly connected with the side wall of the spring seat. The spring seat is provided with a receiving groove with an opening towards the movable contact arc-shaped plate. One end of the elastic part is located inside the receiving groove, and the other end of the elastic part presses the movable contact arc-shaped plate.

[0013] In an optional implementation, the elastic part comprises a spring and a ball. The first end of the spring is located inside the receiving groove. The second end of the spring presses the movable contact arc-shaped plate through the ball. The ball is rotatably connected with the spring.

[0014] In an alternative implementation, the elastic assembly further comprises a spring sleeve, the spring sleeve is located inside the accommodating groove, the first end of the spring is in abutment with the bottom wall of the accommodating groove, the second end of the spring is located inside the spring sleeve and in abutment with the spring sleeve, the spring sleeve is provided with a mounting groove for rotatably mounting the ball towards the end of the arc-shaped plate of the moving contact.

[0015] In an alternative implementation, the support assembly is provided inside the shell and fixed with the shell; the support assembly comprises a magnetic member mounting rack and a movable component positioning rack, the first end of the magnetic member mounting rack is in abutment with the closed end of the shell, the second end of the magnetic member mounting rack is in abutment with the movable component positioning rack; the two ends of the magnetic member mounting rack are respectively provided with openings, the movable magnetic member is located inside the first end of the magnetic member mounting rack and can move along the axis of the magnetic member mounting rack; the shell, the magnetic member mounting rack and the movable component positioning rack define an installation hole for accommodating the fixed magnetic member.

[0016] In an alternative implementation, the first end of the connecting shaft is provided with an enlarged portion, the enlarged portion is provided with an installation groove for fixing the movable magnetic member.

[0017] In an alternative implementation, the shell is further provided with a compression nut, the compression nut is located inside the shell and threadedly connected with the shell, the compression nut is located between the contact seat and the open end of the shell.

[0018] According to another aspect of the embodiments of the present application, a valve position indication system is provided, comprising a valve, a bracket, an electrical connector, an indicator and a non-contact proximity switch as described above;

[0019] The valve is provided with a target for attracting the movable magnetic member of the proximity switch on the valve stem, the valve and the proximity switch are mounted on the bracket, and the indicator is electrically connected with the contact of the proximity switch through the electrical connector.

[0020] As can be understood by those skilled in the art, the non-contact proximity switch of the present application comprises a housing, a driving assembly, an elastic assembly and a contact seat. The housing comprises an open end and a closed end, the contact seat is arranged in the housing and fixedly connected with the housing, and the contact seat is close to the open end of the housing; the contact seat comprises a first static contact extending towards the closed end of the housing, a second static contact and a movable dynamic contact arc-shaped plate, the first static contact and the second static contact are arranged in a spaced manner, and the two ends of the dynamic contact arc-shaped plate are respectively provided with a first dynamic contact and a second dynamic contact. The elastic assembly is rotatably arranged in the housing, and the rotation axis of the elastic assembly is perpendicular to the axis of the housing, a part of the elastic assembly is pressed against the dynamic contact arc-shaped plate and can slide on the surface of the dynamic contact arc-shaped plate to drive the dynamic contact arc-shaped plate to switch between the positions where the first dynamic contact and the first static contact are in contact and the second dynamic contact and the second static contact are in contact. The driving assembly comprises a movable magnetic part, a fixed magnetic part, a connecting shaft and a connecting rod, the fixed magnetic part is fixed in the housing, the movable magnetic part is arranged in the housing and located between the closed end of the housing and the fixed magnetic part, and the movable magnetic part can move in the housing along the axis direction of the housing; the first end of the connecting shaft is fixedly connected with the movable magnetic part, the second end of the connecting shaft is hingedly connected with the first end of the connecting rod through the fixed magnetic part, and the second end of the connecting rod is hingedly connected with the elastic assembly. In this way, when the dynamic contact arc-shaped plate rotates between the positions where the first dynamic contact and the first static contact are in contact and the second dynamic contact and the second static contact are in contact, the elastic assembly can press the first dynamic contact and the first static contact or the second dynamic contact and the second static contact, thereby avoiding the false action of the proximity switch in a vibrating environment. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application and the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0022] Figure 1 It is a schematic diagram of the contact structure of the existing proximity switch;

[0023] Figure 2 It is a schematic diagram of the structure of the non-contact proximity switch provided by the embodiment of the present application in the working state;

[0024] Figure 3 It is a schematic diagram of the structure of the non-contact proximity switch provided by the embodiment of the present application in the working state; Figure 2

[0025] Figure 4 It is a schematic diagram of the structure of the non-contact proximity switch provided by the embodiment of the present application in the working state;

[0026] Figure 5 ​A structure schematic view of the contact seat provided for the embodiment of the present application;

[0027] Figure 6 A structure schematic view of the connection of the moving contact arc-shaped plate, elastic component and driving component provided for the embodiment of the present application;

[0028] Figure 7 A partial structure schematic view of the valve position indication system provided for the embodiment of the present application.

[0029] Explanation of reference signs:

[0030] 1 - shell;

[0031] 2 - contact seat;

[0032] 21 - first stationary contact;

[0033] 22 - second stationary contact;

[0034] 23 - support;

[0035] 24 - contact pin;

[0036] 25 - base;

[0037] 26 - connecting sleeve;

[0038] 27 - moving contact arc-shaped plate;

[0039] 271 - first moving contact;

[0040] 272 - second moving contact;

[0041] 3 - elastic component;

[0042] 31 - spring seat;

[0043] 32 - elastic part;

[0044] 321 - spring;

[0045] 322 - ball;

[0046] 323 - spring sleeve;

[0047] 4 - compression nut;

[0048] 5 - driving component;

[0049] 51 - movable magnetic part;

[0050] 52 - fixed magnetic part;

[0051] 53 - connecting shaft;

[0052] 54 - connecting rod;

[0053] 6 - support component;

[0054] 61-Magnetic component mounting bracket;

[0055] 62-Moving part positioning bracket;

[0056] 7-Target;

[0057] 8-Electrical connectors;

[0058] 81-Socket;

[0059] 82-Plug;

[0060] 9-Moving contact arm. Detailed Implementation

[0061] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0062] Secondly, it should be noted that in the description of this invention, terms such as "inner" and "outer" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0063] Figure 1 This is a schematic diagram of the existing proximity switch contact. (Example) Figure 1 As shown, an existing proximity switch includes a housing, inside which are disposed a movable magnetic component, a fixed magnetic component, a moving contact arm 9, and a connecting shaft coaxial with the housing. The left end of the connecting shaft is connected to the movable magnetic component, and the right end of the connecting shaft passes through the fixed magnetic component and is rigidly connected to the moving contact arm 9. The moving contact arm 9 is perpendicular to the axis of the connecting shaft. A stationary contact is provided on each of the left and right sides of the moving contact arm 9. Here, the contact on the left side of the moving contact arm 9 in the existing proximity switch is defined as the first stationary contact 21, and the contact on the right side of the moving contact arm 9 is defined as the second stationary contact 22. The movable magnetic component can move left and right, thereby driving the moving contact arm 9 to move left and right via the connecting shaft. When the moving contact arm 9 moves to the right end, it contacts the first stationary contact 21; when it moves to the left end, it contacts the second stationary contact 22. However, when the proximity switch is in a vibration environment, the moving contact arm 9 vibrates with the vibration, causing the moving and stationary contacts to switch continuously, making the proximity switch prone to contact malfunction.

[0064] In view of this, the inventors designed a non-contact proximity switch employing an elastic connection. The elastic force of the elastic component presses the moving and stationary contacts together, maintaining reliable contact between the contacts even when the proximity switch vibrates with the environment. The switch includes a housing, a drive assembly, an elastic component, and a contact base. The housing is configured with one open end and one closed end. The contact base is disposed within the housing and fixedly connected to it, with the contact base located near the open end of the housing. The contact base includes a first stationary contact, a second stationary contact, and a rotatable moving contact arc-shaped plate extending towards the closed end of the housing. The first and second stationary contacts are spaced apart, and the moving contact arc-shaped plate has a first moving contact and a second moving contact at its two ends, respectively. The elastic component is rotatably disposed within the housing, with its rotation axis perpendicular to the housing's axis. A portion of the elastic component presses against the moving contact arc-shaped plate and can slide on its surface, driving the moving contact arc-shaped plate to switch between positions where the first moving contact contacts the first stationary contact and where the second moving contact contacts the second stationary contact. The drive assembly includes a movable magnetic component, a fixed magnetic component, a connecting shaft, and a connecting rod. The fixed magnetic component is fixed inside the housing, while the movable magnetic component is disposed inside the housing and located between the closed end of the housing and the fixed magnetic component, and is capable of moving within the housing along the axial direction of the housing. The first end of the connecting shaft is fixedly connected to the movable magnetic component, and the second end of the connecting shaft passes through the fixed magnetic component and is hinged to the first end of the connecting rod. The second end of the connecting rod is hinged to an elastic component. Thus, when the proximity switch operates in a vibrating environment, the elastic component applies a spring force to the curved plate of the moving contact, thereby pressing the first moving contact against the first stationary contact or the second moving contact against the second stationary contact, preventing the proximity switch from malfunctioning under vibration.

[0065] Example 1

[0066] Figure 2 This is a schematic diagram of the non-contact proximity switch provided in this embodiment in its working state. Figure 3 for Figure 2 The diagram shows the structure of a non-contact proximity switch in its non-operating state. Here, the non-operating state is defined as the first moving contact 271 contacting the first stationary contact 21, and the operating state is defined as the second moving contact 272 contacting the second stationary contact 22. Figures 2-3 As shown, the non-contact proximity switch provided in this embodiment includes a housing 1, a contact base 2, an elastic component 3, and a drive component 5. The housing 1 includes an open end and a closed end, serving as the housing of the proximity switch. This embodiment does not limit the diameter and length of the housing 1; those skilled in the art can set them according to actual needs.

[0067] In one possible implementation, the left outer wall of the shell 1 can be provided with external threads, and the proximity switch can be fixed in the position to be installed by the external threads of the shell 1. Preferably, the outer diameter of the left portion of the shell 1 is the smallest, and the outer wall of the left portion is provided with external threads. The outer diameter of the middle portion of the shell 1 is greater than that of the left portion, that is, when the proximity switch is installed by threads, the middle portion of the shell 1 can be used for limiting. The outer diameter of the right portion of the shell 1 is the largest, and the right portion can be provided in a hexagonal shape, facilitating the use of a screwing tool for screwing.

[0068] Preferably, a metal material can be used as the material of the shell 1, for example, the shell 1 can be made of stainless steel. By providing the shell 1 in stainless steel, on the one hand, the structural strength of the shell 1 is ensured, and on the other hand, the stainless steel has better corrosion resistance. Therefore, the non-contact proximity switch provided in this embodiment can be applied to harsh working environments, such as underwater or nuclear power plants.

[0069] Continuing to refer to Figures 2-3 The support assembly 6 is internally provided with a driving assembly 5, and the driving assembly 5 includes a movable magnetic part 51, a fixed magnetic part 52, a connecting shaft 53, and a connecting rod 54. The fixed magnetic part 52 is fixed with the shell 1. In one possible implementation, the shell 1 is internally provided with the support assembly 6, and the support assembly 6 is located in the interior of the shell 1 and is fixed with the shell 1. Exemplarily, the support assembly 6 includes a magnetic part mounting frame 61 and a movable part positioning frame 62. The magnetic part mounting frame 61 and the movable part positioning frame 62 abut each other. Specifically, the left end of the magnetic part mounting frame 61 abuts the closed end of the shell 1, and the right end of the magnetic part mounting frame 61 abuts the left end of the movable part positioning frame 62. The shell 1, the magnetic part mounting frame 61, and the movable part positioning frame 62 define a mounting hole for accommodating the fixed magnetic part 52. Exemplarily, the mounting hole has the same axis as the shell 1, and the fixed magnetic part 52 is fixed in the mounting hole.

[0070] It is worth mentioning that the material of the support assembly 6 should be a diamagnetic material to avoid magnetic permeability when the support assembly 6 is used to fix the fixed magnetic part 52. Preferably, the material of the support assembly 6 also has the properties of high temperature resistance and radiation resistance. For example, Peek (polyether ether ketone) can be selected as the material of the support assembly 6, so that the non-contact proximity switch provided in this embodiment can be applied to harsh environments.

[0071] Figures 2-3It is shown that the movable magnetic piece 51 can move inside the support assembly 6, in particular, the movable magnetic piece 51 is located between the closed end of the shell 1 and the fixed magnetic piece 52, that is, the movable magnetic piece 51 is located at the left of the closed end of the shell 1 and at the right of the fixed magnetic piece 52, and the movable magnetic piece 51 can move left and right. Exemplarily, the magnetic piece mounting frame 61 is provided with openings at both ends, and the movable magnetic piece 51 is located in the left end of the magnetic piece mounting frame 61 and can move along the axis of the magnetic piece mounting frame 61, that is, the left end of the magnetic piece mounting frame 61 is used to mount the movable magnetic piece 51.

[0072] In a possible implementation, the movable magnetic piece 51 is fixed with the left end of the connecting shaft 53, and exemplarily, the left end of the connecting shaft 53 is provided with an enlarged portion, the enlarged portion is provided with a mounting groove, and the movable magnetic piece 51 can be fixed with the mounting groove by inlaying.

[0073] By providing the enlarged portion at the left end of the connecting shaft 53, the enlarged portion is provided with the mounting groove, on the one hand, the stability of the connection between the connecting shaft 53 and the movable magnetic piece 51 is ensured, and on the other hand, the movable magnetic piece 51 can be limited by the outer wall of the enlarged portion and the inner wall of the magnetic piece mounting frame 61, so that the movable magnetic piece 51 can only move left and right in the magnetic piece mounting frame 61 along the axis direction of the magnetic piece mounting frame 61. Figures 2-3

[0074] Figure 4 A partial structure schematic diagram of the driving assembly provided for the embodiment is shown. As shown in Figure 4 , in a possible implementation, the movable magnetic piece 51 and the fixed magnetic piece 52 have the same magnetization direction, that is, the movable magnetic piece 51 and the fixed magnetic piece 52 attract each other, and the fixed magnetic piece 52 can exert a rightward force on the movable magnetic piece 51. When the distance between the external target object, for example, the target 7 with the same magnetization direction as the movable magnetic piece 51, and the movable magnetic piece 51 exceeds the preset distance, the fixed magnetic piece 52 attracts the movable magnetic piece 51 to the right end, and when the distance between the movable magnetic piece 51 and the target 7 is less than the preset distance, the attraction of the target 7 to the movable magnetic piece 51 exceeds the attraction of the fixed magnetic piece 52 to the movable magnetic piece 51, and the movable magnetic piece 51 moves leftward. That is, the movable magnetic piece 51 can move along the axis direction of the support assembly 6 under the magnetic force of the target 7 and the fixed magnetic piece 52. It is easy to understand that the preset distance is the distance between the target 7 and the movable magnetic piece 51 when the attraction of the target 7 to the movable magnetic piece 51 and the attraction of the fixed magnetic piece 52 to the movable magnetic piece 51 are equal.

[0075] As shown in Figures 2-3 ​As shown, the right end of the connecting shaft 53 passes through the fixed magnetic component 52 and is hinged to the left end of the connecting rod 54. That is to say, during the process of the movable magnetic component 51 driving the connecting shaft 53 to move left and right, the connecting rod 54 can rotate relative to the connecting shaft 53. The right end of the connecting rod 54 is hinged to the bottom of the elastic component 3.

[0076] Continue to refer to Figures 2-3 The elastic component 3 is rotatably disposed inside the housing 1. Exemplarily, the elastic component 3 is rotatably disposed inside the movable part positioning bracket 62. Specifically, the elastic component 3 is capable of rotating around... Figure 2 Rotating at point A, the right side of the elastic component 3 presses against the moving contact arc plate 27 and can slide on the surface of the moving contact arc plate 27. The moving contact arc plate 27 is rotatably disposed inside the housing 1. For example, the moving contact arc plate 27 is rotatably disposed inside the movable component positioning frame 62 and inclined to the connecting shaft 53. The proximity switch can be switched between the working state and the non-working state by driving the moving contact arc plate 27 to rotate through the elastic component 3.

[0077] Figure 6 This is a schematic diagram illustrating the connection between the moving contact arc plate, the elastic component, and the driving component provided in this embodiment. Figure 6 As shown, the movable magnetic component 51 can drive the connecting shaft 53 to move left and right. The left and right movement of the connecting shaft 53 can drive the connecting rod 54 to rotate relative to the connecting shaft 53. The connecting rod 54 drives the elastic component 3 to rotate around point A. The right end of the elastic component 3 can slide on the surface of the moving contact arc plate 27. The moving contact arc plate 27 can rotate around point B. Therefore, the rotation of the elastic component 3 can drive the moving contact arc plate 27 to rotate around point B, thereby realizing the switching of the working state.

[0078] Those skilled in the art will understand that the drive assembly 3 converts the linear motion of the movable magnetic element 51 into the rotational motion of the elastic assembly 3 through the connecting rod 54 and the connecting shaft 53. Specifically, when the movable magnetic element 51 moves from right to left, the elastic assembly 3 rotates clockwise; when the movable magnetic element 51 moves from left to right, the elastic assembly 3 rotates counterclockwise.

[0079] One possible implementation is that the elastic component 3 includes a spring seat 31 and an elastic member 32. The spring seat 31 is disposed inside the housing 1 and pinned to the housing 1. Exemplarily, the spring seat is disposed inside the movable member positioning bracket 62. Specifically, the spring seat 31 is located inside the housing 1. Figure 6 Point A is pinned to the movable part positioning bracket 62, and the spring seat 31 can rotate around point A. The side wall of the spring seat 31 is hinged to the right end of the connecting rod 54. Exemplarily, the bottom of the side wall of the spring seat 31 is hinged to the connecting rod 54. Those skilled in the art can also set the hinge point between the spring seat 31 and the connecting rod 54 at other positions on the side wall of the spring seat 31, such as the top. This embodiment is not limited.

[0080] like Figure 6 As shown, the spring seat 31 is provided with an opening facing the moving contact arc-shaped plate 27. Figure 6 The left end of the elastic member 32 is located in the receiving groove on the right side, and the right end of the elastic member 32 presses against the moving contact arc plate 27. A spring seat 31 is provided that is pinned to the support assembly 6. The spring seat 31 is provided with a receiving groove. The elastic member 32 is fixed by the receiving groove. On the one hand, the rotation of the spring seat 31 drives the elastic member 32 to slide on the surface of the moving contact arc plate 27, thereby driving the moving contact arc plate 27 to rotate. On the other hand, the receiving groove limits the left end of the elastic member 32, so that the elastic member 32 can press against the moving contact arc plate 27 to the right.

[0081] Continue to refer to Figure 6 The elastic component 32 includes a spring 321 and a ball 322. The left end of the spring 321 is located inside the receiving groove, and the right end of the spring 321 presses against the moving contact arc plate 27 through the ball 322. The ball 322 and the spring 321 are rotatably connected.

[0082] By configuring the elastic component 32 as a spring 321 and a ball 322, while ensuring that the elastic component 32 applies a rightward elastic force to the moving contact arc plate 27, the ball 322 can contact the moving contact arc plate 27, allowing the elastic component 3 to slide more smoothly on the surface of the moving contact arc plate 27.

[0083] Better, such as Figure 6 As shown, the elastic component 32 also includes a spring sleeve 323 for mounting the ball bearing 322. The spring sleeve 323 is disposed inside the receiving groove, and it is easy to understand that the spring sleeve 323 can slide along the axis of the receiving groove inside the receiving groove. The left end of the spring 321 abuts against the bottom wall of the receiving groove, and the right end of the spring is located inside the spring sleeve 323 and abuts against the spring sleeve 323. The spring 321 is in a compressed state, that is, the spring sleeve 323 has a tendency to move to the right relative to the spring seat 31. The right end of the spring sleeve 323 is provided with a mounting groove for rotatably mounting the ball bearing 322, that is, the mounting groove is larger than the ball bearing 322, thereby ensuring that the ball bearing 322 can rotate inside the mounting groove.

[0084] By setting a spring sleeve 323 and fixing the ball 322 with the mounting groove of the spring sleeve 323, the ball 322 can be prevented from falling off during the movement of the moving contact arc plate 27, thus ensuring the stability of the connection.

[0085] like Figures 2-3As shown, a first moving contact 271 and a second moving contact 272 are respectively provided at the upper and lower ends of the moving contact arc plate 27. It is easy to understand that the moving contact arc plate 27, the first moving contact 271, and the second moving contact 272 are all made of conductive material. This embodiment does not limit the cross-sectional shape of the moving contact arc plate 27; those skilled in the art can configure it according to actual needs.

[0086] Figure 5 This is a schematic diagram of the contact base provided in this embodiment. Figure 2 and Figure 5 As shown, the contact seat 2 is disposed inside the housing 1 and near the opening end of the housing 1. One possible implementation is that the contact seat 2 is disposed inside the housing 1 and abuts against the right end of the support component 6 inside the housing 1. The contact seat 2 includes a first stationary contact 21 and a second stationary contact 22 extending to the left end of the housing 1, with the first stationary contact 21 and the second stationary contact 22 spaced apart. It is easy to understand that the first stationary contact 21 and the second stationary contact 22 can be located on the same side of the moving contact arc plate 27 or on opposite sides of the moving contact arc plate 27, that is, when the moving contact arc plate 27 rotates, the contact positions with the first stationary contact 21 and the contact positions with the second stationary contact 22 can be located on the same side or opposite sides of the moving contact arc plate 27.

[0087] Those skilled in the art will understand that the elastic component 3 presses the moving contact arc plate 27 into a contact state between the first stationary contact 21 and the first moving contact 271 of the moving contact arc plate 27, or a contact state between the second stationary contact 22 and the second moving contact 272 of the moving contact arc plate 27. The rotation of the elastic component 3 causes the ball 322 to move on the moving contact arc plate 27. When the ball 322 passes through the rotation point of the moving contact arc plate 27, for example... Figure 6 The state of the proximity switch only changes when it reaches point B, thus effectively preventing the proximity switch from malfunctioning in a vibration environment.

[0088] like Figure 5 As shown, the contact base 2 also includes a support 23, a contact pin 24, and a base 25. The support 23 is located inside the housing 1 and connected to the moving contact arc plate 27. The moving contact arc plate 27 can rotate around the contact point with the support 23. Preferably, the contact position between the support 23 and the moving contact arc plate 27 is located at the midpoint of the moving contact arc plate 27. Thus, the force required for the elastic component 3 to drive the moving contact arc plate 27 to rotate clockwise is the same as that required to rotate counterclockwise. The proximity switch switches more smoothly between the two different operating states. At the same time, the moving contact arc plate 27 only rotates when the ball 322 passes through the midpoint of the moving contact arc plate 27.

[0089] Continue to refer to Figure 5The contact pins 24 pass through and are fixedly connected to the base 25, the left and right ends of the contact pins 24 extend out of the base 25, and the number of the contact pins 24 is three, the left ends of two of the contact pins 24 form the first static contact point 21 and the second static contact point 22 respectively, and the left end of the other contact pin (not shown in the figure) is fixedly connected to the support 23.

[0090] As can be understood by those skilled in the art, by arranging the base 25 and the contact pins 24, the left end of the contact pin 24 is used to contact the arc-shaped plate 27 of the moving contact point, the right end of the contact pin 24 is used to connect an external circuit, the number of the contact pins 24 is three, one of the contact pins 24 connected to the support 23 can be used as a common terminal of the circuit, and thus the proximity switch provided in the embodiment can be externally connected to two circuits, and the switching between the two circuits can be realized by changing the working state of the proximity switch.

[0091] As shown in Figures 2-3 , the proximity switch provided in the embodiment further comprises a compression nut 4, the compression nut 4 is arranged in the shell 1 and is threadedly connected to the shell 1, and the compression nut 4 is located between the contact point base 2 and the right end of the shell 1. It can be easily understood that the radial section of the compression nut 4 is annular structure, and the right end of the contact pin 24 can extend rightward from the inside of the annular structure. By arranging the compression nut 4, the contact point base 2 can be prevented from being pulled out of the opening end, i.e. the right end, of the shell 1.

[0092] Embodiment Two

[0093] Figure 7 Part of the structure of the valve position indication system provided in the embodiment is shown in the figure. On the basis of the embodiment one, the embodiment further provides a valve position indication system, which comprises a valve, a support, an electrical connecting member 8, an indicator and the non-contact proximity switch in the embodiment one.

[0094] The valve stem of the valve is provided with a target 7, and the embodiment does not limit the fixing mode of the target 7 and the valve stem, and those skilled in the art can arrange it according to actual needs. The valve and the proximity switch are both mounted on the support, and the rear circuit is electrically connected to the contact points of the proximity switch through the electrical connecting member 8, wherein the indicator is located on the rear circuit, i.e. the circuit electrically connected to the proximity switch.

[0095] As shown in Figure 5 and Figure 7 , the electrical connecting member 8 comprises a plug 82 and a socket 81, the main body part of the socket 81 is fixedly connected to the shell 1, for example, by welding, and the contact pins of the socket 81 can be connected to the contact pins of the proximity switch through the connecting sleeve 26. It can be easily understood that the socket 81 is connected to the plug 82 by plug-in connection, and one possible implementation is that a shell sleeve can be arranged on the outer side walls of the socket 81 and the plug 82 to ensure the reliability of the connection between the socket 81 and the plug 82.

[0096] The skilled in the art can understand that when the valve is switched from the open state to the closed state, the valve stem drives the target 7 to move towards the proximity switch, the proximity switch is switched from the non-working state to the working state, the circuit of the latter stage is connected, and the indicator works to indicate that the valve has been closed.

[0097] The proximity switch in the embodiment has the same structure as the proximity switch provided in the first embodiment and can bring the same or similar technical effects, which will not be described here again. For details, refer to the description of the above-mentioned embodiments.

[0098] In the description of the present application, it should be understood that the terms "top", "bottom", "upper", "lower" (if any) indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0099] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0100] The terms "first", "second" in the specification and claims of the present application and the above description of the drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0101] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A non-contact proximity switch, characterized in that, include: The outer casing includes an open end and a closed end; A contact base is disposed inside the housing and fixedly connected to the housing, and the contact base is close to the open end of the housing; the contact base includes a first stationary contact, a second stationary contact, and a rotatable movable contact arc plate extending toward the closed end of the housing, the first stationary contact and the second stationary contact are spaced apart, and the two ends of the movable contact arc plate are respectively provided with a first movable contact and a second movable contact; An elastic component is rotatably disposed within the housing, with its rotation axis perpendicular to the axis of the housing. A portion of the elastic component presses against the moving contact arc plate and is capable of sliding on the surface of the moving contact arc plate to drive the moving contact arc plate to switch between positions where the first moving contact contacts the first stationary contact and where the second moving contact contacts the second stationary contact. A drive assembly includes a movable magnetic component, a fixed magnetic component, a connecting shaft, and a connecting rod. The fixed magnetic component is fixed inside the housing. The movable magnetic component is disposed inside the housing and located between the closed end of the housing and the fixed magnetic component, and the movable magnetic component is capable of moving within the housing along the axial direction of the housing. A first end of the connecting shaft is fixedly connected to the movable magnetic component, and a second end of the connecting shaft passes through the fixed magnetic component and is hinged to a first end of the connecting rod. The second end of the connecting rod is hinged to the elastic component. The elastic component includes a spring seat and an elastic member. The spring seat is disposed inside the housing and pinned to the housing. The spring seat is rotatable about the connection point with the housing. The rotation axis of the spring seat is perpendicular to the axis of the housing. The side wall of the spring seat is hinged to the second end of the connecting rod. The spring seat is provided with a receiving groove with an opening facing the moving contact arc plate. One end of the elastic member is located inside the receiving groove, and the other end presses against the moving contact arc plate.

2. The non-contact proximity switch according to claim 1, characterized in that, The contact base also includes a support located between the first stationary contact and the second stationary contact. One end of the support facing the closed end of the housing is connected to the moving contact arc plate. The moving contact arc plate is rotatable around the connection point with the support. When the portion of the elastic component pressing the moving contact arc plate passes the connection point between the moving contact arc plate and the support, the moving contact arc plate rotates to change the state of the proximity switch.

3. The non-contact proximity switch according to claim 2, characterized in that, The connection point between the moving contact arc plate and the support is located at the midpoint of the moving contact arc plate; and / or, The contact base also includes three contact pins and a base. The three contact pins pass through the base, and two of the contact pins form the first stationary contact and the second stationary contact at the end of the moving contact arc plate. The end of the other contact pin facing the moving contact arc plate is fixedly connected to the support.

4. The non-contact proximity switch according to claim 1, characterized in that, The elastic component includes a spring and a ball bearing. The first end of the spring is located inside the receiving groove, and the second end of the spring presses against the moving contact arc plate through the ball bearing. The ball bearing and the spring are rotatably connected.

5. The non-contact proximity switch according to claim 4, characterized in that, The elastic component also includes a spring sleeve located inside the receiving groove. The first end of the spring abuts against the bottom wall of the receiving groove, and the second end of the spring is located inside the spring sleeve and abuts against the spring sleeve. The end of the spring sleeve facing the moving contact arc plate is provided with a mounting groove for rotatably mounting the ball.

6. The non-contact proximity switch according to claim 1, characterized in that, It also includes a support assembly disposed within and fixed to the housing; the support assembly includes a magnetic component mounting bracket and a movable component positioning bracket, the first end of the magnetic component mounting bracket abutting against the closed end of the housing, and the second end of the magnetic component mounting bracket abutting against the movable component positioning bracket; each end of the magnetic component mounting bracket has an opening, the movable magnetic component is located within the first end of the magnetic component mounting bracket and is capable of moving along the axis of the magnetic component mounting bracket; the housing, the magnetic component mounting bracket, and the movable component positioning bracket define a mounting hole for accommodating the fixed magnetic component.

7. The non-contact proximity switch according to any one of claims 1-6, characterized in that, The first end of the connecting shaft is provided with a bulging part, and the bulging part is provided with a mounting groove for fixing the movable magnetic component.

8. The non-contact proximity switch according to any one of claims 1-6, characterized in that, It also includes a clamping nut, which is disposed inside the housing and threadedly connected to the housing, and the clamping nut is located between the contact seat and the open end of the housing.

9. A valve position indicating system, characterized in that, Includes valves, brackets, electrical connections, indicators, and the non-contact proximity switch according to any one of claims 1-8; The valve stem is provided with a target for attracting the movable magnetic component of the proximity switch. The valve and the proximity switch are mounted on the bracket. The indicator is electrically connected to the contacts of the proximity switch through the electrical connector.

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