Proximity switches

Abstract

The present disclosure provides a proximity switch, comprising: a housing having a first opening and a second opening; a switch body located in the housing; a watertight socket sealed and inserted in the first opening, the watertight socket being electrically connected to the switch body; a sensing element movably inserted in the second opening, configured to move toward the switch body under the action of an external force; an insulating seal located between the switch body and the sensing element, the insulating seal being sealed and connected to the housing, dividing the inner cavity of the housing into a first cavity and a second cavity, the switch body being located in the first cavity, and the sensing element being located in the second cavity. The present disclosure has high pressure resistance and good sealing performance, and can adapt to deep-sea working environments.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater instruments and equipment, and in particular to a proximity switch. Background Art

[0002] A proximity switch is a position switch that can trigger a switch action without direct mechanical contact with moving parts. When a metal detector approaches the sensing component of the proximity switch and the distance between the metal detector and the sensing component reaches the operating distance of the proximity switch, the proximity switch can be activated without mechanical contact or any pressure. Proximity switches can be widely used in machine tools, metallurgy, chemical industry, textile and other fields.

[0003] A proximity switch is provided in the related art, including a shell, in which a sensing component and a main circuit board are arranged, and the sensing component is connected to the main circuit board through a wire.

[0004] However, the proximity switches in the related art have low pressure resistance and are suitable for use in environments without pressure or with low pressure. When in deep-sea environments where high pressure resistance and sealing performance are required, conventional proximity switches cannot be used normally. Summary of the invention

[0005] The embodiment of the present disclosure provides a proximity switch, which has high pressure resistance and good sealing performance and can adapt to deep-sea working environment. The technical solution is as follows:

[0006] An embodiment of the present disclosure provides a proximity switch, which includes: a shell having a first opening and a second opening; a switch body located in the shell; a watertight socket sealed and inserted in the first opening, the watertight socket being electrically connected to the switch body; a sensing element movably inserted in the second opening and configured to move toward the switch body under the action of an external force; an insulating sealing body located between the switch body and the sensing element, the insulating sealing body being sealingly connected to the shell to divide the inner cavity of the shell into a first cavity and a second cavity, the switch body being located in the first cavity, and the sensing element being located in the second cavity.

[0007] In one implementation of the embodiment of the present disclosure, the insulating sealing body includes a sealing cylinder and a transverse partition, both ends of the sealing cylinder are open, the transverse partition is located in the sealing cylinder, and the inner cavity of the sealing cylinder is divided into a first sealing cavity and a second sealing cavity, the switch body is inserted in the first sealing cavity, and the sensing component is inserted in the second sealing cavity.

[0008] In another implementation of the embodiment of the present disclosure, a plurality of axially extending strip grooves are provided on the outer wall of the sealing tube, and the plurality of strip grooves are circumferentially evenly distributed on the outer wall of the sealing tube, and a plurality of strip protrusions matching the strip grooves are provided on the inner wall of the shell; or, a plurality of axially extending strip protrusions are provided on the outer wall of the sealing tube, and the plurality of strip protrusions are circumferentially evenly distributed on the outer wall of the sealing tube, and a plurality of strip grooves matching the strip protrusions are provided on the inner wall of the shell.

[0009] In another implementation of the embodiment of the present disclosure, the inner wall of the shell is provided with an inner flange, one end of the sealing tube is abutted against the inner flange, the outer wall of the sealing tube is fitted with the inner wall of the shell, the inner flange and one end of the sealing tube are provided with annular sealing rings, and at least two circles of annular sealing rings are provided between the outer wall of the sealing tube and the inner wall of the shell.

[0010] In another implementation of the embodiment of the present disclosure, the sensing member includes a sensing touch rod and a first resetting member, the sensing touch rod is inserted in the second opening, the first resetting member is sleeved on the sensing touch rod, and the first resetting member is configured to provide a force for the sensing touch rod to move away from the switch body when the sensing touch rod moves toward the switch body.

[0011] In another implementation of the embodiment of the present disclosure, the sensing member further includes a sensing tube and a second resetting member, the sensing tube is located in the second cavity, the sensing tube is sleeved on the sensing touch rod, the first resetting member is located in the inner cavity of the sensing tube, one end of the first resetting member abuts against the outer wall of the sensing touch rod, the other end of the first resetting member abuts against the inner wall of the sensing tube, the second resetting member is sleeved on the sensing tube, one end of the second resetting member abuts against the outer wall of the sensing tube, and the other end of the second resetting member abuts against the inner wall of the shell.

[0012] In another implementation of the embodiment of the present disclosure, the shell includes a first mounting tube, a second mounting tube and an end cover, one end of the first mounting tube and one end of the second mounting tube are coaxially connected, and the end cover is coaxially pressed on the other end of the second mounting tube, the first mounting tube, the second mounting tube and the end cover constitute a closed cavity, the first opening is located on the outer wall of the first mounting tube, the second opening is located on the end face of the end cover, the switch body is located in the first mounting tube, and the insulating sealing body is located in the second mounting tube.

[0013] In another implementation of the embodiment of the present disclosure, one end of the first mounting tube and one end of the second mounting tube are both provided with a connecting flange, and at least two annular sealing rings are provided between the two connecting flanges.

[0014] In another implementation of the embodiment of the present disclosure, the insulating sealing body is a ceramic material piece.

[0015] In another implementation of the embodiment of the present disclosure, the shell, the watertight socket and the sensing component are all made of titanium alloy.

[0016] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure include at least:

[0017] The shell of the disclosed embodiment is provided with a first opening and a second opening, and a switch body is installed in the shell, and a watertight socket is sealed and inserted in the first opening, and the watertight socket is electrically connected to the switch body for supplying power to the switch body so that the switch body can work normally, and the watertight socket is sealed and connected to the first opening so as to seal the first opening from the outside world and prevent seawater from leaking from the first opening in a deep sea environment; and the sensing element is movably inserted in the second opening, and the sensing element can move toward the switch body under the action of an external force. When in use, an external component applies an external force to the sensing element so that the sensing element moves toward the switch body, that is, when the distance between the sensing element and the sensing component of the switch body reaches the action distance of the proximity switch, the proximity switch starts to act, so that the proximity switch can work; and an insulating seal is also provided in the shell of the proximity switch, and the insulating seal is located at the switch body, so that the proximity switch can work. Between the switch body and the sensing element, the insulating seal is sealed and connected to the shell, which can divide the inner cavity of the shell into a first cavity and a second cavity. The switch body is located in the first cavity, and the sensing element is located in the second cavity. The shell is divided into two cavities by the insulating seal, and the switch body is sealed and isolated in the first cavity. Since the sealing performance of the movable plug-in sensing element is slightly poor, the movable plug-in sensing element is placed in the second cavity, which can effectively prevent seawater from leaking from the second cavity to the first cavity, and prevent the switch body from being corroded by seawater. At the same time, the switch body is always located in the first cavity surrounded by the shell and the insulating seal during operation. The shell and the insulating seal bear the seawater pressure for the switch body. Therefore, the proximity switch has high pressure resistance and sealing performance and can adapt to deep-sea environments. At the same time, since the insulating seal has insulating properties, it will not affect the working state of the proximity switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a structural schematic diagram of a proximity switch provided by an embodiment of the present disclosure;

[0020] Figure 2 is a cross-sectional view of a proximity switch provided by an embodiment of the present disclosure;

[0021] Figure 3 It is a cross-sectional schematic diagram of a sealing cylinder and a shell body provided in an embodiment of the present disclosure.

[0022] The symbols in the figure mean the following:

[0023] 1-housing, 11-first opening, 12-second opening, 13-first cavity, 14-second cavity, 15-first mounting tube, 151-connecting ear plate, 16-second mounting tube, 161-inner flange, 17-end cover, 18-connecting flange, 191-bushing, 192-retaining ring;

[0024] 2- switch body, 21- switch mounting plate;

[0025] 3- Watertight socket;

[0026] 4-sensing element, 41-sensing touch rod, 42-first reset element, 43-sensing cylinder, 44-second reset element;

[0027] 5-insulating sealing body, 51-sealing cylinder, 52-transverse partition, 53-first sealing cavity, 54-second sealing cavity, 55-strip groove, 56-strip protrusion;

[0028] 6-Annular sealing ring. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0030] Figure 1 Schematic diagram of a proximity switch provided by an embodiment of the present disclosure. Figure 1 As shown, the proximity switch comprises: a housing 1, a switch body 2, a watertight socket 3, a sensing element 4 and an insulating sealing body 5.

[0031] Figure 2 is a cross-sectional view of a proximity switch provided by an embodiment of the present disclosure. Figure 2 As shown, the shell 1 has a first opening 11 and a second opening 12; the switch body 2 is located in the shell 1; the watertight socket 3 is sealed and inserted in the first opening 11, and the watertight socket 3 is electrically connected to the switch body 2; the sensing element 4 is movably inserted in the second opening 12, and is configured to be able to move toward the switch body 2 under the action of an external force; the insulating sealing body 5 is located between the switch body 2 and the sensing element 4, and the insulating sealing body 5 is sealed and connected to the shell 1, dividing the inner cavity of the shell 1 into a first cavity 13 and a second cavity 14, the switch body 2 is located in the first cavity 13, and the sensing element 4 is located in the second cavity 14.

[0032] The shell of the disclosed embodiment is provided with a first opening and a second opening, and a switch body is installed in the shell, and a watertight socket is sealed and inserted in the first opening, and the watertight socket is electrically connected to the switch body for supplying power to the switch body so that the switch body can work normally, and the watertight socket is sealed and connected to the first opening so as to seal the first opening from the outside world and prevent seawater from leaking from the first opening in a deep sea environment; and the sensing element is movably inserted in the second opening, and the sensing element can move toward the switch body under the action of an external force. When in use, an external component applies an external force to the sensing element so that the sensing element moves toward the switch body, that is, when the distance between the sensing element and the sensing component of the switch body reaches the action distance of the proximity switch, the proximity switch starts to act, so that the proximity switch can work; and an insulating seal is also provided in the shell of the proximity switch, and the insulating seal is located at the switch body, so that the proximity switch can work. Between the switch body and the sensing element, the insulating seal is sealed and connected to the shell, which can divide the inner cavity of the shell into a first cavity and a second cavity. The switch body is located in the first cavity, and the sensing element is located in the second cavity. The shell is divided into two cavities by the insulating seal, and the switch body is sealed and isolated in the first cavity. Since the sealing performance of the movable plug-in sensing element is slightly poor, the movable plug-in sensing element is placed in the second cavity, which can effectively prevent seawater from leaking from the second cavity to the first cavity, and prevent the switch body from being corroded by seawater. At the same time, the switch body is always located in the first cavity surrounded by the shell and the insulating seal during operation. The shell and the insulating seal bear the seawater pressure for the switch body. Therefore, the proximity switch has high pressure resistance and sealing performance and can adapt to deep-sea environments. At the same time, since the insulating seal has insulating properties, it will not affect the working state of the proximity switch.

[0033] In the embodiments of the present disclosure, Figure 1 As shown, the shell 1 may include a first mounting tube 15, a second mounting tube 16 and an end cover 17. One end of the first mounting tube 15 is coaxially connected to one end of the second mounting tube 16. The end cover 17 is coaxially pressed onto the other end of the second mounting tube 16. The first mounting tube 15, the second mounting tube 16 and the end cover 17 constitute a closed cavity. The first opening 11 is located on the outer wall of the first mounting tube 15, the second opening 12 is located on the end surface of the end cover 17, the switch body 2 is located in the first mounting tube 15, and the insulating sealing body 5 is located in the second mounting tube 16.

[0034] In this embodiment, the housing 1 is divided into three parts: a first mounting tube 15, a second mounting tube 16 and an end cover 17, and each part is used to install different components. The switch body 2 is installed in the first mounting tube 15, and a first opening 11 for inserting the watertight socket 3 is provided on the outer wall of the first mounting tube 15; the insulating seal 5 is installed in the second mounting tube 16; and the induction component 4 is inserted in the end cover 17. That is, different components are individually coated and protected by different shell components, so that each component has a separately configured protective shell, thereby improving the pressure resistance of each component, making the proximity switch more suitable for deep-sea environment. In addition, the first mounting tube 15, the second mounting tube 16 and the insulating seal 5 can constitute a second-level closed protection cavity, and the switch body 2 is located in the closed protection cavity to ensure that the switch body 2 will not be corroded by seawater during use and can withstand greater pressure.

[0035] like Figure 1 As shown, the first mounting tube 15 is cylindrical, and the first opening 11 is located on the side wall of the first mounting tube 15. The first opening 11 is a rectangular cylinder extending radially outward along the first mounting tube 15. After the watertight socket 3 is inserted into the first opening 11, a rectangular flange can be installed on the watertight socket 3, and the rectangular flange is connected to the end of the rectangular cylinder of the first opening 11, so that the watertight socket 3 is fixedly installed in the first opening 11.

[0036] In addition, at least two annular sealing rings 6 are provided between the outer wall of the watertight socket 3 and the first opening 11 to achieve sealed insertion of the watertight socket 3 and the first opening 11, so as to improve the sealing performance between the first opening 11 and the watertight socket 3 and prevent seawater from intruding into the first mounting tube 15 from the first opening 11.

[0037] At the same time, if Figure 2 As shown, a switch body 2 is installed in the first installation cylinder 15, and the switch body 2 is inserted on the switch installation plate 21. In addition, an external thread is provided on the outer wall of the switch body 2, and the switch installation plate 21 has an inner hole, and the inner hole is provided with an internal thread, so that the switch body 2 can be screwed with the inner hole of the switch body 2 through the thread. After the switch body 2 is inserted on the switch installation plate 21, nuts can be screwed in from both ends of the switch body 2, so that both ends of the switch installation plate 21 are locked by the nuts, thereby preventing the switch body 2 from falling off the switch installation plate 21.

[0038] like Figure 2 As shown, when the switch body 2 is fixedly installed in the first installation cylinder 15, the switch installation plate 21 can be fastened to the inner wall of the first installation cylinder 15 by screws.

[0039] like Figure 2As shown, the switch body 2 is placed along the axial direction of the first mounting tube 15, so that one end of the switch body 2 can face the second mounting tube 16 and the end cover 17, so that when the sensing member 4 moves toward the switch body 2, it can approach the sensing surface of the switch body 2. The part of the watertight socket 3 outside the first mounting tube 15 can be electrically connected to the external power supply component, and the other end of the switch body 2 is electrically connected to the watertight socket 3 through a cable to supply power for the normal operation of the watertight socket 3. The good sealing performance of the watertight socket 3 itself is used to prevent seawater from intruding, causing corrosion, circuit failure and other problems.

[0040] It should be noted that the first opening 11 is a cylinder extending radially outward from the first mounting cylinder 15 , and the shape of the first opening 11 may be other shapes besides a rectangle, such as a circle, etc., which is not limited in this embodiment.

[0041] like Figure 1 As shown, one end of the first mounting tube 15 is coaxially connected to one end of the second mounting tube 16, and the other end of the first mounting tube 15 can be provided with a plurality of connecting ear plates 151. The proximity switch can be installed in an underwater hull or other fixed structure through the connecting ear plates 151 to facilitate the fixed connection of the proximity switch.

[0042] like Figure 1 As shown, one end of the first mounting tube 15 has a circular connecting flange 18, and one end of the second mounting tube 16 has a circular connecting flange 18, so that the first mounting tube 15 and the second mounting tube 16 can be connected through the connecting flange 18 and fixed with bolts to achieve coaxial connection between the first mounting tube 15 and the second mounting tube 16.

[0043] Optionally, one end of the first mounting tube 15 and one end of the second mounting tube 16 are both provided with a connecting flange 18, and at least two annular sealing rings 6 are provided between the two connecting flanges 18. Providing the annular sealing ring 6 between the connecting flanges 18 can improve the sealing between the connecting flanges 18, and can effectively prevent seawater from intruding into the first mounting tube 15 and the second mounting tube 16 from the gap between the connecting flanges 18.

[0044] For example, Figure 2 As shown, two circles of annular sealing rings 6 are provided between the two connecting flanges 18. The two circles of annular sealing rings 6 are concentrically arranged and spaced apart so that there is a gap between the two circles of annular sealing rings 6. In this way, even if the outer circle of the annular sealing ring 6 leaks, the inner circle of the annular sealing ring 6 can effectively block seawater and prevent it from intruding into the first mounting tube 15 and the second mounting tube 16.

[0045] Among them, Figure 1As shown, the second mounting tube 16 is cylindrical, and the insulating sealing body 5 is installed in the second mounting tube 16. The second mounting tube 16 is set to be cylindrical, that is, the inner wall of the second mounting tube 16 is also a smooth arc surface, which facilitates the insulating sealing body 5 to fit closely with the inner wall of the second mounting tube 16 to improve the sealing performance of the insulating sealing body 5 and the second mounting tube 16, so that the insulating sealing body 5 divides the inner cavity of the shell 1 into a first cavity 13 and a second cavity 14 which are sealed to each other.

[0046] Optionally, the insulating seal 5 is a ceramic material, that is, the insulating seal 5 is made of ceramic. Ceramics are hard, fine, and have strong pressure resistance and good insulation performance. Therefore, the switch body 2 in the first cavity 13 surrounded by the housing 1 and the insulating seal 5 made of ceramic can withstand the greater seawater pressure in the deep sea environment; at the same time, since the insulating seal 5 made of ceramic has good insulation performance, it will not affect the working state of the switch body 2.

[0047] like Figure 1 As shown, the other end of the second mounting tube 16 is provided with a circular connecting flange 18, and the open end of the end cover 17 is also provided with a circular connecting flange 18, so that the second mounting tube 16 and the end cover 17 can be connected through the connecting flange 18 and fixed with bolts, thereby realizing the coaxial press-fitting of the second mounting tube 16 and the end cover 17.

[0048] like Figure 1 As shown, the end surface of the closed end of the end cover 17 has a second opening 12, and the second opening 12 is used to insert the sensing member 4, and one end of the sensing member 4 is located outside the housing 1, so that the external component can apply an external force to the sensing member 4, so that the sensing member 4 moves toward the switch body 2, that is, when the distance between the sensing member 4 and the sensing component of the switch body 2 reaches the action distance of the proximity switch, the proximity switch starts to act, so that the proximity switch can work.

[0049] Alternatively, if Figure 2 As shown, the insulating sealing body 5 includes a sealing cylinder 51 and a transverse partition 52. Both ends of the sealing cylinder 51 are open. The transverse partition 52 is located in the sealing cylinder 51, dividing the inner cavity of the sealing cylinder 51 into a first sealing cavity 53 and a second sealing cavity 54. The switch body 2 is inserted into the first sealing cavity 53, and the sensor 4 is inserted into the second sealing cavity 54.

[0050] In this embodiment, the insulating sealing body 5 is configured as a sealing cylinder 51 , and a transverse partition 52 is disposed in the sealing cylinder 51 , so that the sealing cylinder 51 is divided into a first sealing chamber 53 and a second sealing chamber 54 that are separated from each other. Among them, the switch body 2 is inserted in the first sealing cavity 53, and the sensing component 4 is inserted in the second sealing cavity 54. In this way, the sealing cylinder 51 is separated by the transverse partition 52, so that the cross section of the insulating sealing body 5 in the axial direction is H-shaped. Since the sealing performance of the movable inserted sensing component 4 is slightly poor, the insulating sealing body 5 is set to be H-shaped. In this way, even if seawater invades the second mounting cylinder 16 from the end cover 17, since the second sealing cavity 54 of the insulating sealing body 5 is directly opposite to the end cover 17, the seawater will first flow into the second sealing cavity 54, and the large amount of free space in the second sealing cavity 54 can be used to gather seawater, thereby preventing seawater from directly flowing to the gap between the sealing cylinder 51 and the second mounting cylinder 16 after entering the second mounting cylinder 16, thereby preventing seawater from invading the first mounting cylinder 15 from the gap between the sealing cylinder 51 and the second mounting cylinder 16 to corrode the switch body 2.

[0051] At the same time, the switch body 2 and the sensing element 4 are respectively arranged in the first sealed cavity 53 and the second sealed cavity 54. Since the first sealed cavity 53 and the second sealed cavity 54 belong to the inner cavity of the sealing tube 51, that is, the first sealed cavity 53 and the second sealed cavity 54 are coaxial, when the sensing element 4 moves, it can be ensured that the sensing element 4 moves in the direction of the switch body 2, so that the proximity switch can work normally.

[0052] Optionally, a plurality of axially extending strip grooves 55 or strip protrusions 56 may be provided on the outer wall of the sealing cylinder 51, and the plurality of strip grooves 55 or strip protrusions 56 may be uniformly distributed circumferentially on the outer wall of the sealing cylinder 51. Correspondingly, a plurality of strip protrusions 56 or strip grooves 55 matching the strip grooves 55 or strip protrusions 56 may be provided on the inner wall of the housing 1.

[0053] By providing a strip groove 55 or a strip protrusion 56 on the outer wall of the sealing cylinder 51, and providing a matching strip protrusion 56 or a strip groove 55 on the inner wall of the shell 1, the original matching plane or curved surface of the sealing cylinder 51 and the shell 1 is changed into a tortuous folded surface. Compared with the matching plane or curved surface, the matching folded surfaces are more likely to prevent seawater from intruding, thereby effectively preventing seawater from intruding and corroding the switch body 2.

[0054] For example, Figure 3 FIG. 1 is a cross-sectional schematic diagram of a sealing cylinder and a housing provided by an embodiment of the present disclosure. Figure 3As shown, a plurality of axially extending strip grooves 55 are provided on the outer wall of the sealing cylinder 51 , and the plurality of strip grooves 55 are evenly distributed circumferentially on the outer wall of the sealing cylinder 51 , and a plurality of strip protrusions 56 matching the strip grooves 55 are provided on the inner wall of the second mounting cylinder 16 .

[0055] By providing a strip groove 55 on the outer wall of the sealing cylinder 51 and a matching strip protrusion 56 on the inner wall of the second mounting cylinder 16, the plane or curved surface that originally matches the sealing cylinder 51 and the second mounting cylinder 16 is changed into a tortuous folded surface. Compared with the matching plane or curved surface, the mutually matching folded surfaces are more likely to prevent seawater from intruding, thereby effectively preventing seawater from intruding and corroding the switch body 2.

[0056] Exemplarily, a plurality of axially extending strip protrusions 56 are provided on the outer wall of the sealing cylinder 51 , and the plurality of strip protrusions 56 are evenly distributed circumferentially on the outer wall of the sealing cylinder 51 , and a plurality of strip grooves 55 matching the strip protrusions 56 are provided on the inner wall of the housing 1 .

[0057] By providing a strip protrusion 56 on the outer wall of the sealing cylinder 51 and a matching strip groove 55 on the inner wall of the second mounting cylinder 16, the plane or curved surface that originally matches the sealing cylinder 51 and the second mounting cylinder 16 is changed into a tortuous folded surface. Compared with the matching plane or curved surface, the mutually matching folded surfaces are more likely to prevent seawater from intruding, thereby effectively preventing seawater from intruding and corroding the switch body 2.

[0058] Optionally, an inner flange 161 is provided on the inner wall of the shell 1, one end of the sealing tube 51 is against the inner flange 161, the outer wall of the sealing tube 51 is fitted with the inner wall of the shell 1, an annular sealing ring 6 is provided on the inner flange 161 and one end of the sealing tube 51, and at least two circles of annular sealing rings 6 are provided between the outer wall of the sealing tube 51 and the inner wall of the shell 1.

[0059] An inner flange 161 is provided on the inner wall of the shell 1. After the sealing cylinder 51 of the insulating sealing body 5 is placed in the shell 1, it abuts against the inner flange 161 in the shell 1, and the inner flange 161 is used to limit the position for easy installation of the sealing cylinder 51. Therefore, the contact portion between the sealing cylinder 51 and the shell 1 includes the outer wall of the sealing cylinder 51 and the inner wall of the shell 1, and the end of the sealing cylinder 51 and the inner flange 161. Therefore, in order to improve the sealing between the sealing cylinder 51 and the shell 1, in this embodiment, an annular sealing ring 6 is provided on the inner flange 161 and one end of the sealing cylinder 51, and at least two circles of annular sealing rings 6 are provided between the outer wall of the sealing cylinder 51 and the inner wall of the shell 1, so as to improve the sealing between the insulating sealing body 5 and the shell 1, thereby effectively preventing seawater from intruding into the shell 1 and corroding the switch body 2.

[0060] For example, Figure 2As shown, an inner flange 161 is provided on the inner wall of the second mounting cylinder 16, and an annular sealing ring 6 is provided between the inner flange 161 and the sealing cylinder 51. At the same time, two circles of annular sealing rings 6 are provided between the outer wall of the sealing cylinder 51 and the inner wall of the second mounting cylinder 16. The two circles of annular sealing rings 6 are coaxially sleeved on the sealing cylinder 51, and the two circles of annular sealing rings 6 are arranged at intervals so that there is a gap between the two circles of annular sealing rings 6. In this way, even if the outer circle of the annular sealing ring 6 leaks, the inner circle of the annular sealing ring 6 can effectively block seawater and prevent it from intruding into the first mounting cylinder 15.

[0061] Alternatively, if Figure 2 As shown, the sensing member 4 includes a sensing touch rod 41 and a first resetting member 42. The sensing touch rod 41 is inserted into the second opening 12, and the first resetting member 42 is sleeved on the sensing touch rod 41. The first resetting member 42 is configured to provide a force for the sensing touch rod 41 to move away from the switch body 2 when the sensing touch rod 41 moves toward the switch body 2. In this way, after the sensing touch rod 41 is moved toward the switch body 2 by the external force, when the external force disappears, the first resetting member 42 can provide a force for the sensing touch rod 41 to move away from the switch body 2, so that the sensing touch rod 41 can be reset to perform the next switch action.

[0062] For example, Figure 2 As shown, the first reset member 42 can be a spring, which is sleeved on the sensing touch rod 41. One end of the spring can be against the shoulder on the sensing touch rod 41, and the other end of the spring can be against the outer wall of the shell 1. In this way, after the sensing touch rod 41 is moved toward the switch body 2 by the external force, the spring is compressed and accumulates energy. When the external force disappears, the spring can provide the sensing touch rod 41 with a force to move away from the switch body 2, so that the sensing touch rod 41 can be reset to perform the next switch action.

[0063] Alternatively, if Figure 2As shown, the sensing element 4 may further include a sensing tube 43 and a second reset element 44. The sensing tube 43 is located in the second cavity 14, and the sensing tube 43 is sleeved on the sensing contact rod 41. The first reset element 42 is located in the inner cavity of the sensing tube 43, and one end of the first reset element 42 abuts against the outer wall of the sensing contact rod 41, and the other end of the first reset element 42 abuts against the inner wall of the sensing tube 43. The second reset element 44 is sleeved on the sensing tube 43, and one end of the second reset element 44 abuts against the outer wall of the sensing tube 43, and the other end of the second reset element 44 abuts against the inner wall of the housing 1. In this way, when the sensing contact rod 41 is subjected to an external force and moves toward the switch body 2, the first reset element 42 is also subjected to an external force and pushes the sensing tube 43 to move toward the switch body 2, that is, the sensing tube 43 also moves close to the switch body 2. When the distance between the sensing tube 43 and the sensing component of the switch body 2 reaches the action distance of the proximity switch, the proximity switch starts to act. When the external force disappears, the first restoring member 42 and the second restoring member 44 can provide a force for the sensing rod 41 and the sensing tube 43 to move away from the switch body 2 , so that the sensing rod 41 and the sensing tube 43 can be reset for the next switch action.

[0064] For example, Figure 2 As shown, the first reset member 42 and the second reset member 44 can both be springs, one end of the first reset member 42 abuts against the shoulder of the sensing touch rod 41, and the other end of the first reset member 42 abuts against the end face of one end of the sensing tube 43. At the same time, a bushing 191 and a retaining ring 192 can also be provided on the end cover 17. The bushing 191 is inserted into the inner hole of the end cover 17, and the axial length of the bushing 191 is greater than the thickness of the end face of the end cover 17, so that the sensing touch rod 41 can be inserted into the end cover 17 more stably. The retaining ring 192 can be inserted into the other end of the end cover 17. The retaining ring 192 is used to resist one end of the second reset member 44, and the other end of the second reset member 44 abuts against the shoulder on the outer wall of the sensing tube 43. In this way, when the sensing rod 41 is subjected to external force and moves toward the switch body 2, the first reset member 42 is also subjected to external force and compressed, and the first reset member 42 pushes the sensing tube 43 to move toward the switch body 2. At the same time, the second reset member 44 is also subjected to the shoulder pressure of the sensing tube 43 and compressed, and the sensing tube 43 approaches the switch body 2, so that the proximity switch starts to operate. When the external force disappears, the first reset member 42 and the second reset member 44 can provide the sensing rod 41 and the sensing tube 43 with a force to move away from the switch body 2, so that the sensing rod 41 and the sensing tube 43 can be reset to perform the next switch action.

[0065] Optionally, the housing 1, the watertight socket 3 and the sensor 4 are all made of titanium alloy. The parts of the housing 1, the watertight socket 3 and the sensor 4 that are in direct contact with seawater are made of titanium alloy, which can effectively prevent the corrosion of the housing 1, the watertight socket 3 and the sensor 4 by seawater, thereby improving the service life of the proximity switch.

[0066] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A proximity switch, It is characterized in that The proximity switch comprises: A housing (1) having a first opening (11) and a second opening (12); A switch body (2) is located inside the housing (1); a watertight socket (3) sealed and inserted in the first opening (11), the watertight socket (3) being electrically connected to the switch body (2); A sensing element (4) movably inserted into the second opening (12) and configured to move toward the switch body (2) under the action of an external force; An insulating sealing body (5) is located between the switch body (2) and the sensing element (4). The insulating sealing body (5) is sealedly connected to the housing (1) to divide the inner cavity of the housing (1) into a first cavity (13) and a second cavity (14). The switch body (2) is located in the first cavity (13), and the sensing element (4) is located in the second cavity (14). The insulating sealing body (5) comprises a sealing cylinder (51) and a transverse partition (52). Both ends of the sealing cylinder (51) are open. The transverse partition (52) is located in the sealing cylinder (51) to divide the inner cavity of the sealing cylinder (51) into a first sealing cavity (53) and a second sealing cavity (54). The switch body (2) is inserted into the first sealing cavity (53), and the sensing element (4) is inserted into the second sealing cavity (54).

2. The proximity switch according to claim 1, It is characterized in that The outer wall of the sealing cylinder (51) is provided with a plurality of axially extending strip grooves (55), the plurality of strip grooves (55) are evenly distributed circumferentially on the outer wall of the sealing cylinder (51), and the inner wall of the housing (1) is provided with a plurality of strip protrusions (56) matching the strip grooves (55); or, The outer wall of the sealing cylinder (51) is provided with a plurality of axially extending strip-shaped protrusions (56), and the plurality of strip-shaped protrusions (56) are evenly distributed circumferentially on the outer wall of the sealing cylinder (51), and the inner wall of the housing (1) is provided with a plurality of strip-shaped grooves (55) matching the strip-shaped protrusions (56).

3. The proximity switch according to claim 1, It is characterized in that The inner wall of the shell (1) is provided with an inner flange (161), one end of the sealing tube (51) is in contact with the inner flange (161), the outer wall of the sealing tube (51) is in contact with the inner wall of the shell (1), an annular sealing ring (6) is provided between the inner flange (161) and one end of the sealing tube (51), and at least two circles of annular sealing rings (6) are provided between the outer wall of the sealing tube (51) and the inner wall of the shell (1).

4. The proximity switch according to any one of claims 1 to 3, It is characterized in that The sensing member (4) comprises a sensing touch rod (41) and a first resetting member (42); the sensing touch rod (41) is inserted into the second opening (12); the first resetting member (42) is sleeved on the sensing touch rod (41); and the first resetting member (42) is configured to provide a force for the sensing touch rod (41) to move away from the switch body (2) when the sensing touch rod (41) moves toward the switch body (2).

5. The proximity switch according to claim 4, It is characterized in that The sensing element (4) further comprises a sensing tube (43) and a second resetting element (44); the sensing tube (43) is located in the second cavity (14); the sensing tube (43) is sleeved on the sensing touch rod (41); the first resetting element (42) is located in the inner cavity of the sensing tube (43); one end of the first resetting element (42) abuts against the outer wall of the sensing touch rod (41); the other end of the first resetting element (42) abuts against the inner wall of the sensing tube (43); the second resetting element (44) is sleeved on the sensing tube (43); one end of the second resetting element (44) abuts against the outer wall of the sensing tube (43); and the other end of the second resetting element (44) abuts against the inner wall of the housing (1).

6. The proximity switch according to any one of claims 1 to 3, It is characterized in that The housing (1) comprises a first mounting tube (15), a second mounting tube (16) and an end cover (17); one end of the first mounting tube (15) and one end of the second mounting tube (16) are coaxially connected; the end cover (17) is coaxially pressed onto the other end of the second mounting tube (16); the first mounting tube (15), the second mounting tube (16) and the end cover (17) constitute a closed cavity; the first opening (11) is located on the outer wall of the first mounting tube (15); the second opening (12) is located on the end surface of the end cover (17); the switch body (2) is located in the first mounting tube (15); and the insulating sealing body (5) is located in the second mounting tube (16).

7. The proximity switch according to claim 6, It is characterized in that One end of the first installation tube (15) and one end of the second installation tube (16) are both provided with a connecting flange (18), and at least two annular sealing rings (6) are provided between the two connecting flanges (18).

8. The proximity switch according to any one of claims 1 to 3, It is characterized in that The insulating sealing body (5) is a ceramic material piece.

9. The proximity switch according to any one of claims 1 to 3, It is characterized in that The housing (1), the watertight socket (3) and the induction component (4) are all made of titanium alloy material.

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