Dustproof micro switch

Abstract

This utility model relates to the field of micro switches. It discloses a dustproof micro switch, comprising: a housing, a spacer element, a button, a conductive component, and a trigger element. The spacer element divides the interior of the housing into an outer chamber and a dustproof chamber. The outer chamber has an external guide hole. The upper and lower ends of the button are slidably disposed in the external guide hole and the outer chamber, respectively. A trigger structure is provided on the surface of the lower end of the button near the spacer element. The conductive component includes a common contact, a normally closed contact, and a normally open contact. The upper ends of the normally closed and normally open contacts are respectively provided with normally closed and normally open contacts. The upper end of the common contact has a bent section, and the lower end of the bent section has a common contact. The normally closed contact, the common contact, and the normally open contact are arranged sequentially along a horizontal direction near the outer chamber. The trigger element is disposed in the bent section, with one end penetrating the spacer element and abutting against the trigger structure. A multi-layered sealing structure effectively prevents dust from entering the dustproof chamber inside the housing through the gaps in the external guide hole.

Description

Technical Field

[0001] This utility model relates to the field of micro switches, and in particular to a dustproof micro switch. Background Technology

[0002] Micro switches are a commonly used type of switching component. Specifically, a micro switch is a contact mechanism that performs a switching action with a predetermined stroke. It is covered by a housing and has an external actuator rod. Because the contact spacing is relatively small, it is called a micro switch, also known as a sensitive switch. In existing micro switches, a gap exists between the actuator rod and the housing during movement, resulting in generally poor dust protection. This allows external dust to enter the housing, affecting its use.

[0003] Therefore, a dustproof micro switch is designed, which uses a button as the driving element and separates the driving element from the conductive component to prevent dust from entering the cavity of the conductive component. Utility Model Content

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a dustproof micro switch, comprising:

[0005] shell;

[0006] A spacer element is disposed inside the housing, which divides the interior of the housing into an outer chamber and a dustproof chamber. The spacer element has an inner guide hole that connects the outer chamber and the dustproof chamber, and the outer chamber has an outer guide hole that connects to the outside.

[0007] A button, the upper and lower ends of which are slidably disposed in the outer guide hole and the outer cavity respectively, and a trigger structure is provided on the surface of the lower end of the button near the spacer element;

[0008] A conductive component, comprising a common contact, a normally closed contact, and a normally open contact, wherein the common contact, normally closed contact, and normally open contact are sequentially arranged in the dustproof chamber along the direction approaching the outer cavity;

[0009] The normally closed contact and normally open contact are respectively provided with normally closed contact and normally open contact at their upper ends. The upper end of the common contact is bent downward to provide a bent section. The lower end of the bent section is provided with a common contact. The normally closed contact, the common contact and the normally open contact are arranged sequentially along the horizontal direction close to the outer cavity.

[0010] A trigger element, wherein the middle part of the trigger element is disposed in the bending section, and one end of the trigger element passes through the spacer element and abuts against the trigger structure.

[0011] Preferably, the spacer element includes an upper plate and a lower plate, and the outer shell includes a main shell and a base. The upper plate and the lower plate are respectively fixed inside the main shell and on the upper surface of the base. The lower end of the upper plate and the upper end of the lower plate are provided with through grooves, and the two through grooves together form the inner guide hole.

[0012] Preferably, the dustproof micro switch further includes an elastic component, which includes a first spring and a second spring. The two ends of the first spring are respectively disposed on the button and the inner wall of the outer cavity, and the two ends of the second spring are respectively disposed on the trigger element and the common contact.

[0013] Preferably, the triggering structure includes a triggering groove and a vertical plane, which are arranged sequentially from top to bottom on the button, and the plane at the bottom of the triggering groove and the vertical plane are arranged alternately along the direction close to the triggering element.

[0014] Preferably, the triggering element includes a trigger block, the center line of the inner guide hole intersects the center line of the outer guide hole perpendicularly, the trigger block includes a protrusion, a main block and a positioning rod connected in sequence, the main block and the positioning rod respectively pass through the inner guide hole and the bent section, the second spring is sleeved on the positioning rod, and the protrusion cooperates with the inclined surface of the trigger groove wall.

[0015] Preferably, the triggering element further includes a clamping block, which is disposed on the positioning rod. The two ends of the second spring are respectively disposed on the clamping block and the common contact piece. The surfaces of the main block and the clamping block near the bending section are both convex arc surfaces.

[0016] Preferably, the longitudinal section of the positioning rod is a rounded rectangle, the longitudinal section of the main block is a rectangle, the longitudinal section of the positioning rod is smaller than the longitudinal section of the main block, a through hole is provided in the middle of the bent section, and the positioning rod is clearance-fitted with the through hole.

[0017] Preferably, the longitudinal section of the trigger groove is an isosceles trapezoid, and the length H of the bottom of the trigger groove and the length L of the longitudinal section of the main block satisfy the following relationship: H≥2*L.

[0018] Preferably, the bent section is an elastic conductive sheet bent into an inverted L-shape.

[0019] Preferably, the dustproof micro switch further includes a dustproof sleeve, an upper annular groove is provided at the upper end of the button, a lower annular groove is provided around the outer guide hole on the outer wall of the outer shell, the upper and lower ends of the dustproof sleeve are respectively bonded to the inside of the upper annular groove and the lower annular groove, the bottom of the upper annular groove is vertically set, and the bottom of the upper annular groove is horizontally set.

[0020] The working principle of this utility model is as follows: the dust cover covers and blocks the outer guide hole to prevent dust from entering the outer chamber. The inner guide hole is the only connection channel between the outer chamber and the dustproof chamber, and the main body of the trigger element is sleeved inside the inner guide hole. The trigger element will close the channel between the outer chamber and the dustproof chamber. The dustproof chamber is closed by the cooperation of the spacer element and the trigger element, thus preventing dust from entering the dustproof chamber.

[0021] The main body and clamping block of the trigger element hold and position the bent section. When the button is pressed, the first spring is compressed, and the trigger element moves horizontally. The protrusion of the trigger element moves from the vertical plane of the trigger structure into the trigger groove. The trigger element causes the bent section and its lower end common contact to swing towards the outer cavity. When the protrusion of the trigger element contacts the trigger groove of the trigger structure, the common contact and the normally open contact make contact and conduct.

[0022] When the button rebounds and resets, the first spring is compressed, and the trigger element moves horizontally. The protrusion of the trigger element moves from the vertical plane of the trigger structure into the trigger groove. The trigger element drives the bent section and its lower common contact to swing towards the outer cavity. When the protrusion of the trigger element contacts the trigger groove of the trigger structure, the common contact and the normally open contact make contact and conduct.

[0023] The beneficial effects of this utility model are as follows: the common contact, normally open contact, and normally closed contact are all located inside the dustproof chamber. The dustproof chamber is sealed by the cooperation of the spacer element and the trigger element, preventing dust from entering the dustproof chamber and preventing dust from adhering to the common contact, normally open contact, and normally closed contact. The multiple sealing structure effectively prevents dust from entering the dustproof chamber inside the housing through the gap of the outer guide hole. Attached Figure Description

[0024] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0025] Figure 1 A schematic diagram of the initial state of a dustproof micro switch provided in an embodiment of this utility model;

[0026] Figure 2 A schematic diagram of the trigger state of a dustproof micro switch provided in an embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of a button provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of a trigger element provided in an embodiment of the present invention;

[0029] The markings in the diagram are: 1: Housing; 2: Button; 3: Dust cover; 4: Spacer element; 5: Upper plate; 6: Lower plate; 7: Common contact; 8: Normally closed contact; 9: Normally open contact; 71: Bend section; 72: Common contact; 81: Normally closed contact; 91: Normally open contact; 10: Trigger element; 11: Trigger structure. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0031] It should be noted that, in this utility model, unless otherwise stated, when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or an intervening element may be present simultaneously. When an element is referred to as "connected to" another element, it can be directly connected to the other element or an intervening element may be present simultaneously. The directional terms used, such as "up," "down," "left," and "right," generally refer to... Figure 1 The directions shown are up, down, left, and right. "Inner" and "outer" refer to the inner and outer parts of a specific outline. "Far" and "near" refer to the distance or proximity relative to a particular component.

[0032] like Figures 1-4 As shown in the figure, an embodiment of the present invention provides a dustproof micro switch, comprising:

[0033] Outer shell 1;

[0034] The spacer element 4 is disposed inside the outer shell 1 and divides the interior of the outer shell 1 into an outer chamber and a dustproof chamber. The spacer element has an inner guide hole that connects the outer chamber and the dustproof chamber, and the outer chamber has an outer guide hole that connects to the outside.

[0035] Button 2, the upper and lower ends of button 2 are respectively slidably disposed in the outer guide hole and the outer cavity, and a trigger structure 11 is provided on the surface of the lower end of button 2 near the spacer element 4;

[0036] A conductive component, comprising a common contact 7, a normally closed contact 8, and a normally open contact 9, wherein the common contact 7, the normally closed contact 8, and the normally open contact 9 are sequentially arranged in the dustproof chamber along the direction close to the outer cavity;

[0037] The normally closed contact 8 and normally open contact 9 are respectively provided with normally closed contact 81 and normally open contact 91 at their upper ends. The common contact 7 is bent downward at its upper end and is provided with a bent section 71. The common contact 72 is provided at the lower end of the bent section 71. The normally closed contact 81, the common contact 72 and the normally open contact 91 are arranged sequentially along the horizontal direction close to the outer cavity.

[0038] A trigger element 10 is provided in the middle of the bent section 71, and one end of the trigger element 10 passes through the spacer element 4 and abuts against the trigger structure 11.

[0039] The spacer element 4 includes an upper plate 5 and a lower plate 6. The outer shell 1 includes a main shell and a base. The upper plate 5 and the lower plate 6 are respectively fixed inside the main shell and on the upper surface of the base. The lower end of the upper plate 5 and the upper end of the lower plate 6 are provided with through grooves. The two through grooves together form the inner guide hole.

[0040] The common contact 7, normally closed contact 8, and normally open contact 9 are all elongated conductive strips extending vertically. The normally open contact 9 is disposed on the lower plate 6, and the lower plate 6 supports and strengthens the normally open contact 9 and the normally open contact 91, preventing plastic deformation of the normally open contact 9 and the normally open contact 91.

[0041] The dustproof micro switch also includes an elastic component, which comprises a first spring and a second spring. The two ends of the first spring are respectively disposed on the button 2 and the inner wall of the outer cavity, and the two ends of the second spring are respectively disposed on the trigger element 10 and the common contact 7. The main body and clamping block of the trigger element 10 clamp and position the bent section 71. The second spring applies elastic force to the trigger element 10 and causes the trigger element 10 to move towards the button 2, thus extending its service life.

[0042] The trigger structure 11 includes a trigger groove and a vertical plane, which are arranged sequentially from top to bottom on the button 2. The bottom plane of the trigger groove and the vertical plane are arranged alternately along the direction close to the trigger element 10. When the trigger element 10 is in contact with the vertical plane, the common contact 72 is in contact with the normally closed contact 81, and the button 2 is in the highest position. When the trigger element 10 is in contact with the bottom of the trigger groove, the common contact 72 is in contact with the normally open contact 91. When the button 2 is fully pressed, the trigger element 10 is in contact with the upper end of the bottom of the trigger groove, and the button 2 is in the lowest position.

[0043] The trigger element 10 includes a trigger block. The spacer element 4 has an inner guide hole, the center line of which intersects perpendicularly with the center line of the outer guide hole. The trigger block includes a protrusion, a main block, and a positioning rod connected in sequence. The main block and the positioning rod pass through the inner guide hole and the bent section 71, respectively. The second spring is sleeved on the positioning rod. The protrusion engages with the inclined surface of the trigger groove wall. The lower end of the trigger groove wall is inclined. The protrusion is a sideways triangular prism structure. The lower surface of the protrusion engages with the inclined surface of the lower end of the trigger groove wall, facilitating the guidance of the protrusion so that it can smoothly slide into or out of the trigger groove.

[0044] The trigger element 10 also includes a clamping block, which is disposed on the positioning rod. The two ends of the second spring are respectively disposed on the clamping block and the common contact piece 7. The surfaces of the main block and the clamping block near the bending section 71 are both convex arc surfaces. The clamping block and the main block cooperate to clamp and position the bending section 71, effectively improving the accuracy of the bending section 71 when it swings and avoiding excessive movement and inverted plastic deformation of the bending section 71.

[0045] The longitudinal cross-section of the positioning rod is a rounded rectangle, while the longitudinal cross-section of the main block is rectangular. The longitudinal cross-section of the positioning rod is smaller than that of the main block. A through hole is provided in the middle of the bent section 71, and the positioning rod is clearance-fitted with the through hole. The second spring sleeve is disposed on the positioning rod. The positioning rod is used to fix the clamping block and also to position the second spring.

[0046] The longitudinal cross-section of the trigger groove is an isosceles trapezoid. The length H of the bottom of the trigger groove and the length L of the longitudinal cross-section of the main block satisfy the following relationship: H ≥ 2 * L. When button 2 is fully pressed down, the protrusion will move to the bottom of the trigger groove near the outer guide hole. Extending the length of the trigger groove can delay the disconnection time of the common contact 72 and the normally open contact 91, and can extend the contact and conduction time between the common contact 72 and the normally open contact 91.

[0047] The bent section 71 is an elastic conductive sheet bent into an inverted L-shape. The elastic deformation of the bent section 71 causes the common contact 72 to swing between the normally closed contact 81 and the normally open contact 91.

[0048] The dustproof micro switch also includes a dustproof sleeve 3. An upper annular groove is formed at the upper end of the button 2, and a lower annular groove is formed around the outer guide hole on the outer wall of the outer casing 1. The upper and lower ends of the dustproof sleeve 3 are respectively adhered to the interiors of the upper and lower annular grooves. The bottom of the upper annular groove is vertically positioned, and the bottom of the lower annular groove is horizontally positioned. The dustproof sleeve 3 covers and blocks the outer guide hole, preventing dust from entering the outer cavity.

[0049] In one embodiment, both the upper plate 5 and the lower plate 6 are fixed with dustproof blocks, which are sponge blocks or rubber blocks, and each dustproof block has a groove for the main block to pass through.

[0050] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these should all be considered to be within the scope of this specification.

Claims

1. A dustproof micro switch, characterized in that: include: shell; A spacer element is disposed inside the housing, which divides the interior of the housing into an outer chamber and a dustproof chamber. The spacer element has an inner guide hole that connects the outer chamber and the dustproof chamber, and the outer chamber has an outer guide hole that connects to the outside. A button, the upper and lower ends of which are slidably disposed in the outer guide hole and the outer cavity respectively, and a trigger structure is provided on the surface of the lower end of the button near the spacer element; A conductive component, comprising a common contact, a normally closed contact, and a normally open contact, wherein the common contact, normally closed contact, and normally open contact are sequentially arranged in the dustproof chamber along the direction approaching the outer cavity; The normally closed contact and normally open contact are respectively provided with normally closed contact and normally open contact at their upper ends. The upper end of the common contact is bent downward to provide a bent section. The lower end of the bent section is provided with a common contact. The normally closed contact, the common contact and the normally open contact are arranged sequentially along the horizontal direction close to the outer cavity. A trigger element, wherein the middle part of the trigger element is disposed in the bending section, and one end of the trigger element passes through the spacer element and abuts against the trigger structure.

2. The dustproof micro switch according to claim 1, characterized in that: The spacer element includes an upper plate and a lower plate. The outer shell includes a main shell and a base. The upper plate and the lower plate are respectively fixed inside the main shell and on the upper surface of the base. The lower end of the upper plate and the upper end of the lower plate are provided with through slots. The two through slots together form the inner guide hole.

3. The dustproof micro switch according to claim 1, characterized in that: The dustproof micro switch also includes an elastic component, which includes a first spring and a second spring. The two ends of the first spring are respectively disposed on the button and the inner wall of the outer cavity, and the two ends of the second spring are respectively disposed on the trigger element and the common contact.

4. The dustproof micro switch according to claim 3, characterized in that: The triggering structure includes a triggering groove and a vertical plane. The triggering groove and the vertical plane are arranged sequentially from top to bottom on the button. The plane where the bottom of the triggering groove is located and the vertical plane are arranged alternately along the direction close to the triggering element.

5. The dustproof micro switch according to claim 4, characterized in that: The triggering element further includes a triggering block. The center line of the inner guide hole intersects perpendicularly with the center line of the outer guide hole. The triggering block includes a protrusion, a main block, and a positioning rod connected in sequence. The main block and the positioning rod pass through the inner guide hole and the bent section, respectively. The second spring is sleeved on the positioning rod. The protrusion engages with the inclined surface of the trigger groove wall.

6. The dustproof micro switch according to claim 5, characterized in that: The triggering element also includes a clamping block, which is disposed on the positioning rod. The two ends of the second spring are respectively disposed on the clamping block and the common contact piece. The surfaces of the main block and the clamping block near the bending section are both convex arc surfaces.

7. The dustproof micro switch according to claim 5, characterized in that: The longitudinal section of the positioning rod is a rounded rectangle, the longitudinal section of the main block is a rectangle, the longitudinal section of the positioning rod is smaller than the longitudinal section of the main block, a through hole is provided in the middle of the bent section, and the positioning rod is clearance-fitted with the through hole.

8. The dustproof micro switch according to claim 5, characterized in that: The longitudinal section of the trigger groove is an isosceles trapezoid, and the length H of the bottom of the trigger groove and the length L of the longitudinal section of the main block satisfy the following relationship: H≥2*L.

9. The dustproof micro switch according to claim 1, characterized in that: The bent section is an elastic conductive sheet bent into an inverted L-shape.

10. The dustproof micro switch according to claim 1, characterized in that: The dustproof micro switch also includes a dustproof sleeve. An upper annular groove is provided at the upper end of the button, and a lower annular groove is provided around the outer guide hole on the outer wall of the outer shell. The upper and lower ends of the dustproof sleeve are respectively bonded to the inside of the upper annular groove and the lower annular groove. The bottom of the upper annular groove is set vertically and the bottom of the upper annular groove is set horizontally.

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