Hermetically sealed microswitch

Abstract

The utility model relates to an air-tight seal microswitch, which comprises a box, a touch device and an electrical switching device, the electrical switching device comprises a movable contact piece, the touch device is used for transmitting external force to the movable contact piece, the touch device comprises a sleeve, a button, a corrugated diaphragm and a sliding block, an accommodating cavity is arranged in the box, one end of the sleeve is embedded in the surface of the box, and the other end of the sleeve is embedded in the sliding block. A containing cavity is formed in one end of the sleeve, a guide groove is formed in the other end of the sleeve and extends into the containing cavity, the button is sleeved with the sleeve, a boss is arranged on the surface of the button, the sliding block is sleeved with the guide groove, the sliding block and the boss are connected together through the corrugated diaphragm, and the movable contact piece, the corrugated diaphragm, the boss and the sliding block are all contained in the containing cavity. By adopting the technical scheme provided by the utility model, the corrugated diaphragm is prevented from being directly exposed in the external environment, the corrugated diaphragm is prevented from being invaded by chemical substances in the external environment, and when the local elasticity of the corrugated diaphragm loses efficacy, the overall elasticity of the corrugated diaphragm is not influenced, so that the external force can be reliably transmitted to the moving contact all the time.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro switches, and in particular relates to a gas-sealed micro switch. Background Art

[0002] A micro switch is a pressure-activated fast-change switch. Because the contact spacing of the switch is relatively small, it is called a micro switch, also known as a smart switch. Common micro switches generally include a trigger device and an electrical switching device. The trigger device is used to transmit external force to the electrical switching device, and the electrical switching device is used to achieve the switching of the electrical connection state.

[0003] For example, the patent document with the publication number "CN106128807B" discloses a micro switch trigger device and a micro switch module using the device, wherein the micro switch trigger device includes a swing bracket equipped with a force transmission member, the force transmission member has an avoidance groove, and the avoidance groove is close to the two groove walls close to the notch to form a first contour surface for pressing the trigger button of the micro switch and a second contour surface symmetrical about the first symmetry plane, the rotation axis of the force transmission member is on the first symmetry plane, the force transmission member also has a first contact portion in contact with the trigger member and a second contact portion symmetrical about the second symmetry plane; the force transmission member has a free position, a first direction trigger position and a second direction trigger position opposite to the first direction trigger position, and the micro switch device also includes a reset mechanism for resetting the force transmission member from the first and second direction trigger positions to the free position. This patented technology realizes the two-way same-position triggering of the micro switch.

[0004] However, the touch device of the existing micro switch is generally made of elastic and insulating materials, and the touch element is generally exposed outside the housing of the micro switch. On the one hand, since the touch element is directly exposed to the external environment, it is very easy to be damaged by oxidation or attacked by chemical substances in the external environment. On the other hand, the touch element is frequently subjected to external forces and is prone to elastic failure, which affects the normal use of the micro switch and affects the service life of the micro switch. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a hermetic sealing micro switch.

[0006] The utility model provides an airtight micro switch, comprising a box, a touch device and an electrical switching device, wherein the electrical switching device comprises a moving contact piece, the touch device is used to transmit external force to the moving contact piece, the touch device comprises a sleeve, a button, a corrugated diaphragm and a slider, an accommodating cavity is provided in the box, one end of the sleeve is embedded in the surface of the box, the other end of the sleeve is provided with a guide groove and extends into the accommodating cavity, the button is sleeved in the sleeve, the surface of the button is provided with a boss, the slider is sleeved in the guide groove, the slider and the boss are connected together through the corrugated diaphragm, and the moving contact piece, the corrugated diaphragm, the boss and the slider are all accommodated in the accommodating cavity.

[0007] The electrical switching device also includes a common contact, a normally open contact and a normally closed contact. One end of the moving contact piece is fixedly connected to the common contact. When an external force is transmitted to the moving contact piece through the trigger device, the force switches the electrical connection between the other end of the moving contact piece and the normally closed contact to the electrical connection between the other end of the moving contact piece and the normally open contact.

[0008] The normally closed contact is also fixedly connected to the first conductive sheet, and the normally open contact is also fixedly connected to the second conductive sheet. The electrical connection between the movable contact sheet and the normally closed contact and the electrical connection between the movable contact sheet and the normally open contact means that the movable contact sheet is in abutment with the first conductive sheet or the second conductive sheet.

[0009] A limiting hole is further provided on the surface of the movable contact piece, and a reset spring is further provided in the accommodating cavity, wherein at least one end of the reset spring passes through the limiting hole.

[0010] The movable contact piece is also fixedly connected to one end of the supporting piece, and the other end of the supporting piece passes through the limiting hole. The surface of the supporting piece is also provided with a V-shaped groove, and at least one end of the reset spring piece extends into and abuts against the V-shaped groove.

[0011] The reset spring is in an inverted V shape as a whole.

[0012] The box comprises a shell and a base. One end of the shell is open. The base and the shell are welded together and the base covers the open end of the shell. The accommodating cavity is a closed space formed by the base and the shell.

[0013] The base is also fixedly connected with the supporting base.

[0014] The surface of the support seat is also provided with a positioning hole, and a shaft sleeve is embedded in the positioning hole.

[0015] A guide hole is also provided on the surface of the sliding block, a pressure rod is also installed in the guide hole, and the end of the button extends into the guide hole.

[0016] The beneficial effects of the utility model are as follows: by adopting the technical solution provided by the utility model, the touch device is installed in the box, and the inside of the box is filled with inert gas. On the one hand, it can prevent the corrugated diaphragm and other touch elements from being directly exposed to the external environment, prevent the corrugated diaphragm from being invaded by chemical substances in the external environment, and extend the service life of the touch element; on the other hand, a corrugated diaphragm is adopted as the touch element, and the corrugated diaphragm is composed of a plurality of corrugated sheets. Even if the elasticity of a local corrugated sheet fails, it will not cause the overall elasticity of the corrugated diaphragm to fail, thereby ensuring that the external force can always be reliably transmitted to the moving contact sheet, and realizing reliable electrical connection replacement of the micro switch; in addition, compared with elastic elements such as springs in the prior art, the corrugated diaphragm is easier to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the utility model;

[0018] Figure 2 This is a schematic diagram of the connection structure of the common contact, the supporting piece, the moving contact piece and the reset spring piece of the utility model;

[0019] Figure 3 The utility model is a schematic diagram of the connection structure of a button, a sleeve, a housing, a slider and a corrugated diaphragm.

[0020] In the figure: 1-box, 2-moving contact piece, 3-common contact, 4-normally open contact, 5-normally closed contact, 6-sleeve, 7-button, 8-accommodating chamber, 9-first conductive sheet, 10-second conductive sheet, 11-limiting hole, 12-reset spring sheet, 13-support sheet, 14-V-shaped groove, 15-housing, 16-base, 17-support seat, 18-positioning hole, 19-sleeve, 20-boss, 21-slider, 22-corrugated diaphragm, 23-pressure rod, 24-guide groove, 25-guide hole. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings, but the claimed protection scope is not limited to the above;

[0022] The utility model provides a hermetic seal micro switch, such as Figures 1 to 3As shown, it includes a box 1, a trigger device and an electrical switching device, the electrical switching device includes a moving contact piece 2, the trigger device is used to transmit external force to the moving contact piece 1, the trigger device includes a sleeve 6, a button 7, a corrugated diaphragm 22 and a slider 21, a housing chamber 8 is provided in the box 1, one end of the sleeve 6 is embedded in the surface of the box 1, the other end of the sleeve 6 is provided with a guide groove 24 and extends into the housing chamber 8, the button 7 is sleeved in the sleeve 6, the surface of the button 7 is provided with a boss 20, the slider 21 is sleeved in the guide groove 24, the slider 21 and the boss 20 are connected together through the corrugated diaphragm 22, and the moving contact piece 2, the corrugated diaphragm 22, the boss 20 and the slider 21 are all accommodated in the housing chamber 8. The housing chamber 8 is also filled with an inert gas.

[0023] By adopting the technical solution provided by the utility model, the touch device is installed in the box and the inside of the box is filled with inert gas. On the one hand, it can prevent the corrugated diaphragm and other touch elements from being directly exposed to the external environment, prevent the corrugated diaphragm from being invaded by chemical substances in the external environment, and extend the service life of the touch element; on the other hand, a corrugated diaphragm is used as the touch element. The corrugated diaphragm is composed of a plurality of corrugated sheets. Even if the elasticity of a local corrugated sheet fails, it will not cause the overall elasticity of the corrugated diaphragm to fail, thereby ensuring that the external force can always be reliably transmitted to the moving contact sheet, thereby realizing reliable electrical connection and replacement of the micro switch; in addition, compared with elastic elements such as springs in the prior art, the corrugated diaphragm is easier to install.

[0024] Specifically, the electrical switching device further includes a common contact 3, a normally open contact 4 and a normally closed contact 5. One end of the moving contact piece 2 is fixedly connected to the common contact 3. When an external force is transmitted to the moving contact piece 2 through the trigger device, the force switches the electrical connection between the other end of the moving contact piece 2 and the normally closed contact 5 to the electrical connection between the other end of the moving contact piece 2 and the normally open contact 4. The normally closed contact 5 is also fixedly connected to the first conductive sheet 9, and the normally open contact 4 is also fixedly connected to the second conductive sheet 10. The electrical connection between the moving contact piece 2 and the normally closed contact 5 and the electrical connection between the moving contact piece 2 and the normally open contact 4 refer to: the moving contact piece 2 is in contact with the first conductive sheet 9 or the second conductive sheet 10.

[0025] In addition, a limiting hole 11 is provided on the surface of the movable contact piece 2, and a reset spring piece 12 is provided in the accommodating cavity 8, and at least one end of the reset spring piece 12 passes through the limiting hole 11. The movable contact piece 2 is also fixedly connected to one end of a support piece 13, and the other end of the support piece 13 passes through the limiting hole 11. A V-shaped groove 14 is provided on the surface of the support piece 13, and at least one end of the reset spring piece 12 extends into and abuts against the V-shaped groove 14. Preferably, the reset spring piece 12 is in an inverted V shape as a whole. When a force is applied to one end of the button 7, the force is transmitted to the moving contact piece 2 via the other end of the button 7, so that the other end of the moving contact piece 2 is disconnected from the normally closed contact 5 and the electrical connection between the moving contact piece and the normally open contact 4 is contacted. In this process, the reset spring 12 is deformed, so that the elastic potential energy is stored in the reset spring 12. When the button 7 is released, the other end of the moving contact piece 2 is disconnected from the normally open contact 4 and the electrical connection between the moving contact piece and the normally closed contact 5 is contacted. At this time, the reset spring 12 releases the elastic potential energy and returns to its initial state.

[0026] In addition, the box 1 includes a shell 15 and a base 16. The shell 15 is open at one end, and the base 16 is welded to the shell 15 as a whole. The base 16 covers the open end of the shell 15, and the accommodating cavity 8 is a closed space formed by the base 16 and the shell 15. The base 16 is also fixedly connected to the support base 17. Preferably, the support base 17 is made of ceramic material.

[0027] Specifically, the surface of the support seat 17 is also provided with a positioning hole 18, and a shaft sleeve 19 is embedded in the positioning hole 18. The positioning hole 18 is used to enable the micro switch to be assembled as a whole to the required application scenario. The surface of the button 7 is provided with a boss 20, and the surface of the sleeve 6 is also provided with a guide groove 24. A slider 21 is set in the guide groove 24, and the slider 21 and the boss 20 are connected together through a corrugated diaphragm 22. When a force is applied to one end of the button 7, the button 7 moves along the axial direction of the sleeve 6, causing the corrugated diaphragm to deform and compress, and at the same time, the force is transmitted to the moving contact piece 2 via the pressure rod 23.

[0028] In addition, a guide hole 25 is provided on the surface of the slider 21, and a pressure rod 23 is mounted in the guide hole 25, and the end of the button 7 extends into the guide hole 25. The pressure rod 23 is made of insulating material, so that the button 7 can be made of metal material, which is beneficial to improve the overall durability of the micro switch.

Claims

1. A hermetic seal micro switch, characterized in that: The invention comprises a box (1), a trigger device and an electrical switching device, wherein the electrical switching device comprises a moving contact piece (2), the trigger device is used to transmit external force to the moving contact piece (2), the trigger device comprises a sleeve (6), a button (7), a corrugated diaphragm (22) and a slider (21), the box (1) is provided with a receiving cavity (8), one end of the sleeve (6) is embedded in the surface of the box (1), and the other end of the sleeve (6) is provided with a guide groove (24 ) and extends into the accommodating cavity (8), the button (7) is sleeved in the sleeve (6), a boss (20) is provided on the surface of the button (7), the slider (21) is sleeved in the guide groove (24), the slider (21) and the boss (20) are connected together through the corrugated diaphragm (22), and the moving contact piece (2), the corrugated diaphragm (22), the boss (20) and the slider (21) are all accommodated in the accommodating cavity (8).

2. The hermetic micro switch according to claim 1, characterized in that: The electrical switching device further comprises a common contact (3), a normally open contact (4) and a normally closed contact (5); one end of the movable contact piece (2) is fixedly connected to the common contact (3); when an external force is transmitted to the movable contact piece (2) through the trigger device, the electrical connection between the other end of the movable contact piece (2) and the normally closed contact (5) is switched to the electrical connection between the other end of the movable contact piece (2) and the normally open contact (4).

3. The hermetic micro switch according to claim 2, characterized in that: The normally closed contact (5) is also fixedly connected to the first conductive sheet (9), and the normally open contact (4) is also fixedly connected to the second conductive sheet (10). The electrical connection between the movable contact sheet (2) and the normally closed contact (5) and the electrical connection between the movable contact sheet (2) and the normally open contact (4) means that the movable contact sheet (2) is in abutment contact with the first conductive sheet (9) or the second conductive sheet (10).

4. The hermetic micro switch according to claim 1, characterized in that: A limiting hole (11) is also provided on the surface of the movable contact piece (2), and a reset spring (12) is also provided in the accommodating cavity (8), wherein at least one end of the reset spring (12) passes through the limiting hole (11).

5. The hermetic micro switch according to claim 4, characterized in that: The movable contact piece (2) is also fixedly connected to one end of the support piece (13), the other end of the support piece (13) passes through the limiting hole (11), and the surface of the support piece (13) is also provided with a V-shaped groove (14), and at least one end of the reset spring piece (12) extends into and abuts against the V-shaped groove (14).

6. A hermetic micro switch as claimed in claim 4 or 5, characterized in that: The reset spring (12) is in an inverted V shape as a whole.

7. The hermetic micro switch according to claim 1, characterized in that: The box (1) comprises an outer shell (15) and a base (16); one end of the outer shell (15) is open; the base (16) and the outer shell (15) are welded together as a whole, and the base (16) covers the open end of the outer shell (15); and the accommodating cavity (8) is a closed space formed by the base (16) and the outer shell (15).

8. The hermetic micro switch according to claim 7, characterized in that: The base (16) is also fixedly connected to the support base (17).

9. The hermetic micro switch according to claim 8, characterized in that: The surface of the support seat (17) is also provided with a positioning hole (18), and a shaft sleeve (19) is embedded in the positioning hole (18).

10. The hermetic micro switch according to claim 1, characterized in that: The surface of the slider (21) is also provided with a guide hole (25), a pressure rod (23) is also mounted inside the guide hole (25), and the end of the button (7) extends into the guide hole (25).

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