Microswitch and reed structure thereof

Abstract

The utility model relates to a microswitch and a reed structure thereof, comprising a first reed, one end of which is provided with a movable contact; one side, opposite to the movable contact, of the supporting sheet is provided with a reed clamping groove, and the first reed is buckled in the reed clamping groove; and the protection piece is fixed on the first reed and pressed on the inner wall of the reed clamping groove by the first reed, the protection piece isolates the first reed from the supporting piece, the protection piece is in running fit with the inner wall of the reed clamping groove in the rotating direction of the first reed, and the protection piece is a conductive part. According to the utility model, the protection piece fixed on the first reed is in running fit with the supporting sheet instead of running fit between the first reed and the supporting sheet in the prior art, so that the first reed is prevented from being worn or broken after multiple times of rotation; and the second reed and the first reed are overlapped and fixed, so that the problem that the elastic sheet is tired after the microswitch is used for many times due to the fact that the elastic sheet applies pressure to the first reed is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a micro switch and a reed structure thereof. Background Art

[0002] A micro switch is a contact mechanism with a small contact interval and a snap-action mechanism, which performs a switch action with a specified stroke and a specified force. External mechanical force acts on the action reed through a transmission element. When the action reed moves to a critical point, an instantaneous action is generated, causing the moving contact at the end of the action reed to quickly connect or disconnect with the fixed contact. At present, the mechanical life of micro switches on the domestic market varies from 100,000 times to 50 million times depending on the different use requirements, and the service life of the reed in the micro switch is very high.

[0003] The patent with publication number CN211929325U proposes a micro switch for aviation switches, which proposes that a reed is connected to the second tilting portion of a support plate, and a reed slot is formed on the second tilting portion, and the reed is buckled in the reed slot. After the micro switch is used too many times, the reed at the reed slot is worn by the support plate, causing the action to fail, and even causing the reed to break, resulting in damage to the micro switch or a reduction in service life. Utility Model Content

[0004] In view of this, one of the purposes of the utility model is to provide a reed structure to solve the technical problem in the prior art that after the micro switch is used too many times, the reed is worn by the support plate at the reed slot, causing failure of action or even reed breakage.

[0005] The utility model provides a spring structure, comprising: a first spring, one end of which is provided with a moving contact; a supporting sheet, a spring slot is provided on the side of the supporting sheet facing away from the moving contact, and the first spring is buckled in the spring slot; a protective member, the protective member is fixed on the first spring and is pressed against the inner wall of the spring slot by the first spring, the protective member isolates the first spring from the supporting sheet, the protective member and the inner wall of the spring slot are rotatably matched along the rotation direction of the first spring, and the protective member is a conductive member.

[0006] Optionally, a strip hole is provided on the first reed sheet, the length of the strip hole extends along the length direction of the first reed sheet, the support sheet partially passes through the strip hole and protrudes from the upper surface of the first reed sheet, and the protective member is located at one end of the strip hole in the length direction.

[0007] Optionally, a first arc surface is provided on a side of the protective member facing the reed slot, and a second arc surface is provided on an inner wall of the reed slot, and the second arc surface is rotatably matched with the first arc surface.

[0008] Optionally, the protective member includes an upper connecting portion, a lower connecting portion and a bending portion, the upper end of the bending portion is integrally formed with the upper connecting portion, the lower end of the bending portion is integrally formed with the lower connecting portion, and the first arc surface is located on the bending portion; the lower surface of the upper connecting portion is tightly fixed to the upper surface of the first spring leaf, and the upper surface of the lower connecting portion is tightly fixed to the lower surface of the first spring leaf.

[0009] Optionally, the width of the upper connecting portion and / or the lower connecting portion is greater than the width of the bending portion.

[0010] Optionally, the lower surface of the upper connecting portion is fixedly connected to the upper surface of the first reed by brazing; and the upper surface of the lower connecting portion is fixedly connected to the lower surface of the first reed by brazing.

[0011] Optionally, the protective member is a silver plate.

[0012] Optionally, the spring structure also includes a second spring and a spring sheet, the first spring sheet and the second spring sheet are both flat spring sheets, and the spring sheet is partially curved; the second spring sheet is stacked and fixed to the first spring sheet, and the second spring sheet is used to thicken the first spring sheet at the point where the spring sheet presses against it; the support sheet is provided with a spring sheet slot on the side facing the moving contact, the spring sheet passes through the strip hole, one end of the spring sheet abuts against one end of the strip hole close to the moving contact, and the other end abuts against the spring sheet slot.

[0013] Optionally, both the first reed and the second reed are provided with mounting holes for accommodating the moving contact, and the second reed is fastened to the first reed via the moving contact.

[0014] The second object of the utility model is to provide a micro switch, comprising the above-mentioned reed structure, and also comprising a bottom filler, a cover, an upper contact piece, a lower contact piece, a button and a sealing ring, the cover and the bottom filler form a chamber for accommodating the reed structure, one end of the upper contact piece, the lower contact piece and the support piece are all located in the chamber, and the other end passes through the bottom filler to the outside of the micro switch, the cover is provided with a clamping hole for positioning the sealing ring, the clamping hole leads to the chamber, the sealing ring is sealed and connected to the button, one end of the button protrudes from the clamping hole and the sealing ring, and the other end extends into the chamber to press against the upper surface of the first reed.

[0015] The technical solution of the utility model has the following advantages:

[0016] 1. The protective piece fixed on the first spring piece is used to rotate with the support piece, which replaces the rotational cooperation between the first spring piece and the support piece in the prior art, thereby avoiding the wear or breakage of the first spring piece after multiple rotations;

[0017] 2. The protective member and the support sheet are provided with matching arc surfaces, so that the two can maintain a stable and large contact area when they rotate relative to each other. Compared with the smaller contact area when the support sheet directly contacts the first reed in the prior art, the resistance at the rotating contact point between the reed slot and the protective member is reduced;

[0018] 3. The protective member includes an upper connecting portion and a lower connecting portion. The upper connecting portion is closely attached to the upper surface of the first reed and brazed, and the lower connecting portion is closely attached to the lower surface of the first reed and brazed, thereby reducing the resistance between the protective member and the first reed;

[0019] 4. Since the spring sheet exerts pressure on the first spring sheet, that is, the force that moves the first spring sheet to move the moving contact, the spring sheet will fatigue after repeated use of the micro switch, and the second spring sheet is superimposed and fixed on the first spring sheet to solve this problem;

[0020] 5. Use the bottom filler to pass the upper contact piece, the lower contact piece and the support piece to the outside of the micro switch, and use the card hole, the sealing ring and the button on the cover to keep the chamber isolated from the outside when the button is pressed, so that the micro switch has certain waterproof and dustproof properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a front view of the micro switch of the utility model;

[0023] Figure 2 It is a cross-sectional view of the micro switch of the utility model;

[0024] Figure 3 This is a three-dimensional diagram of the micro switch of the utility model after the cover is hidden;

[0025] Figure 4 It is a schematic diagram of the connection between the supporting sheet and the first reed sheet in the micro switch of the utility model.

[0026] Description of reference numerals:

[0027] 1. First spring leaf; 11. Strip hole; 2. Second spring leaf; 21. Mounting hole; 3. Spring leaf; 4. Moving contact; 41. Upper cone cap; 42. Lower cone cap; 43. Connecting column; 5. Supporting sheet; 5a. First top end; 5b. Second top end; 5c. Groove; 51. Spring leaf clamping slot; 511. Second arc surface; 52. Spring leaf clamping slot; 6. Protective member; 61. Upper connecting portion; 62. Lower connecting portion; 63. Bending portion; 631. First arc surface; 7. Bottom filler; 8. Cover; 81. Clamping hole; 9. Upper contact sheet; 10. Lower contact sheet; 12. Button; 121. Annular groove; 122. Limiting column; 13. Sealing ring; 14. Chamber. DETAILED DESCRIPTION

[0028] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Unless otherwise clearly specified and limited, the terms "disposed", "installed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0031] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0032] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0033] Reference Figure 1 and Figure 2As shown, the utility model provides a micro switch, including a bottom filler 7, a cover 8, a reed structure, an upper contact piece 9, a lower contact piece 10, a button 12 and a sealing ring 13, wherein a card hole 81 is arranged on the top of the cover 8 and the bottom is open, the bottom of the cover 8 is closed with the bottom filler 7, the cover 8 and the bottom filler 7 form a chamber 14, and the reed structure is accommodated in the chamber 14. The sealing connection method of the bottom filler 7 and the cover 8 includes but is not limited to gluing and ultrasonic welding. The bottom filler 7 is made of non-conductive material; the reed structure includes a support sheet 5, the support sheet 5, the upper contact sheet 9 and the lower contact sheet 10 are fixed as a whole with the bottom filler 7, and pass through the bottom filler 7; the upper contact sheet 9, the lower contact sheet 10 and the support sheet 5 are all located in the chamber 14 at one end, and the other end passes through the bottom filler 7 to the outside of the micro switch.

[0034] Reference Figure 2 The inner cavity of the clamping hole 81 at the top of the cover 8 is in an inverted T shape. The clamping hole 81 can be directly set in the wall of the cover 8, or a protrusion can be set on the outer wall of the cover 8, and then the clamping hole 81 is set in the protrusion; the bottom of the clamping hole 81 directly passes through the chamber 14. The clamping hole 81 is used to position the sealing ring 13: the sealing ring 13 is also in an inverted T shape, the bottom of the sealing ring 13 is clamped in the clamping hole 81, the top of the sealing ring 13 protrudes outside the clamping hole 81, and the side wall of the sealing ring 13 cooperates with the inner cavity of the clamping hole 81; the sealing ring 13 is made of rubber and has elasticity. After the sealing ring 13 is installed in the clamping hole 81, the side wall of the sealing ring 13 should be tightly against the inner wall of the clamping hole 81, so as to achieve a sealed connection.

[0035] Reference Figure 2 and Figure 3 A button 12 is inserted into the hole of the sealing ring 13. The button 12 has three integrally formed sections: upper, middle and lower. The upper section is cylindrical and inserted into the sealing ring 13, the middle section is quadrangular prism-shaped, and the lower section is triangular prism-shaped; the top of the upper section of the button 12 protrudes from the top of the sealing ring 13 to facilitate pressing the button 12; the middle section of the button 12 is located in the chamber 14, and the inner wall of the cover 8 has a groove structure that cooperates with the middle section of the button 12 to guide the movement of the button 12; the lower section of the button 12 is also located in the chamber 14, and one edge of the lower section faces downward to press the spring structure. The top diameter of the sealing ring 13 is smaller than the internal inner diameter, and the upper side of the button 12 is provided with an annular groove 121, and the top opening of the sealing ring 13 is plugged into the annular groove 121; since the sealing ring 13 is elastic, the top of the sealing ring 13 will be compressed and deformed when the button 12 moves up and down, and the top of the sealing ring 13 protrudes outside the card hole 81, so there is a margin for deformation at the top of the sealing ring 13; the cooperation between the sealing ring 13 and the annular groove 121 makes the micro switch at the button 12 waterproof and dustproof.

[0036] Reference Figure 2The spring structure includes a first spring 1, a second spring 2, a spring 3, a protective member 6, a moving contact 4 and a supporting sheet 5, wherein the first spring 1 and the second spring 2 are flat springs, and the spring 3 is a partially bent spring.

[0037] Reference Figure 3 A strip hole 11 is provided at the long axis of the upper surface of the first reed 1, and the length of the strip hole 11 extends along the length direction of the first reed 1; a limiting column 122 is integrally formed at the bottom end of the button 12, and the limiting column 122 is coaxial with the button 12. The limiting column 122 is inserted into the strip hole 11, and the lower section of the button 12 is pressed on the upper surface of the first reed 1; when the button 12 presses the first reed 1 downward, the limiting column 122 limits the first reed 1 to prevent the first reed 1 from radial displacement along the limiting column 122.

[0038] Reference Figure 2 and Figure 3 The top of the support sheet 5 is divided into a first top 5a and a second top 5b, both of which are inserted into the strip hole 11 and protrude from the upper surface of the first spring sheet 1; a groove 5c is formed between the first top 5a and the second top 5b, and the limit column 122 and the lower section of the button 12 are located directly above the groove 5c. The groove 5c can accommodate the downward limit column 122 and the lower section of the button 12 to prevent the button 12 from interfering with the support sheet 5 when it moves downward.

[0039] A moving contact 4 is arranged at one end of the first spring 1, and the moving contact 4 includes a coaxial upper cone cap 41, a lower cone cap 42 and a connecting column 43. A second spring 2 is stacked on the half section of the first spring 1 where the moving contact 4 is arranged. Both the first spring 1 and the second spring 2 have mounting holes 21 for accommodating the connecting column 43. The connecting column 43 is passed through the mounting hole 21 to connect the first spring 1 and the second spring 2 in series, and then the upper cone cap 41 is installed at the upper end of the connecting column 43 and the lower cone cap 42 is installed at the lower end, so that the stacking and fixing of the first spring 1 and the second spring 2 can be realized. The upper cone cap 41 and the lower cone cap 42 can be installed on the connecting column 43 by threaded connection or welding or other methods, which are not specifically limited in this embodiment. Since the spring 3 applies pressure to the first spring 1, that is, the force to move the first spring 1 to move the moving contact 4, the spring 3 will fatigue after the micro switch is used many times, and the second spring 2 is stacked and fixed on the first spring 1, which can solve this problem.

[0040] The support sheet 5, the lower contact sheet 10 and the upper contact sheet 9 are arranged from left to right on the bottom filler 7. The top of the upper contact sheet 9 is bent and located directly above the moving contact 4, and the top of the lower contact sheet 10 is bent and located directly below the moving contact 4. The support sheet 5 is provided with a spring clip slot 52 on the side facing the moving contact 4, and a spring clip slot 51 on the side facing away from the moving contact 4; the spring clip slot 52 is used to abut against the lower end of the spring sheet 3, and the spring clip slot 51 is used to buckle the end of the strip hole 11 away from the moving contact 4.

[0041] The spring piece 3 passes through the strip hole 11, a part of the spring piece 3 is located above the first spring piece 1, and the rest of the spring piece 3 is located below the first spring piece 1; the bent part of the spring piece 3 is also located above the first spring piece 1, and the bent part is arched upward; the end of the spring piece 3 located above the first spring piece 1 is against the end of the strip hole 11 close to the moving contact 4, and the end of the spring piece 3 located below the first spring piece 1 is against the spring piece slot 52. The second spring piece 2 is used to thicken the part of the first spring piece 1 pressed by the spring piece 3, so the second spring piece 2 extends to the end of the strip hole 11 against which the spring piece 3 is pressed.

[0042] Reference Figure 4 , the support sheet 5 is not in direct contact with the first reed sheet 1, but is rotatably connected to the first reed sheet 1 through the protective member 6; the protective member 6 serves to isolate the first reed sheet 1 from the support sheet 5, and prevents the first reed sheet 1 from being worn by the support sheet 5 when rotating. The protective member 6 is made of a conductive plate, such as a silver plate, or other plates, which is not specifically limited in this embodiment.

[0043] The protective member 6 is bent to form a bending portion 63, and the two ends of the bending portion 63 are respectively a straight upper connecting portion 61 and a lower connecting portion 62. The protective member 6 is passed through the strip hole 11 and wraps around the first spring piece 1 at one end of the strip hole 11 in the length direction. The lower surface of the upper connecting portion 61 is in close contact with the upper surface of the first spring piece 1 and is fixedly connected by brazing; the upper surface of the lower connecting portion 62 is in close contact with the lower surface of the first spring piece 1 and is fixedly connected by brazing; the design of the connection method between the upper connecting portion 61, the lower connecting portion 62 and the first spring piece 1 reduces the resistance between the protective member 6 and the first spring piece 1. Furthermore, the width of the upper connecting portion 61 and / or the lower connecting portion 62 can be designed to be greater than the width of the bending portion 63, thereby further increasing the contact area with the first spring piece 1 to reduce the resistance; the direction of the width is the width direction of the first spring piece 1.

[0044] Reference Figure 3 and Figure 4Under the pressing force of the spring sheet 3 on the first spring sheet 1 , the first spring sheet 1 presses the protective member 6 into the spring sheet slot 51 , so that the bent portion 63 of the protective member 6 is in close contact with the inner wall of the spring sheet slot 51 . A first arc surface 631 is provided on the side of the bending portion 63 facing the spring slot 51, and a second arc surface 511 is provided on the inner wall of the spring slot 51. The second arc surface 511 is rotationally matched with the first arc surface 631, and the rotation direction is the rotation direction of the first spring 1 when the button 12 presses the first spring 1; this design utilizes the protective member 6 fixed on the first spring 1 to rotate with the support sheet 5, replacing the rotational cooperation between the first spring 1 and the support sheet 5 in the prior art, thereby avoiding wear or breakage of the first spring 1 after multiple rotations; matching arc surfaces are provided on the protective member 6 and the support sheet 5, so that the two can maintain a stable and large contact area when they rotate relative to each other. Compared with the smaller contact area when the support sheet 5 directly contacts the first spring 1 in the prior art, the design of this embodiment reduces the resistance at the rotational contact point between the protective member 6 and the spring slot 51.

[0045] In summary, the micro switch provided in this embodiment has the following working principle: after pressing the button 12, the button 12 presses down the first spring leaf 1, causing the first spring leaf 1 to rotate around the spring leaf slot 51, and the spring leaf 3 is then deformed and drives the moving contact 4 to move, causing the moving contact 4 to change from contacting the upper contact piece 9 to contacting the lower contact piece 10, thereby realizing circuit switching.

[0046] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A reed structure, characterized in that: include: A first reed, wherein a moving contact is provided at one end of the first reed; A support sheet, wherein a reed slot is provided on the side of the support sheet facing away from the moving contact, and the first reed is buckled in the reed slot; A protective member, wherein the protective member is fixed on the first reed and is pressed against the inner wall of the reed slot by the first reed, wherein the protective member isolates the first reed from the support sheet, wherein the protective member and the inner wall of the reed slot rotate in cooperation along the rotation direction of the first reed, and wherein the protective member is a conductive member.

2. The reed structure according to claim 1, characterized in that: The first reed is provided with a strip hole, the length of which extends along the length direction of the first reed, the support sheet partially passes through the strip hole and protrudes from the upper surface of the first reed, and the protective member is located at one end of the strip hole in the length direction.

3. The reed structure according to claim 1, characterized in that: The protective member is provided with a first arc surface on one side facing the reed slot, and the inner wall of the reed slot is provided with a second arc surface, and the second arc surface is rotationally matched with the first arc surface.

4. The reed structure according to claim 3, characterized in that: The protective member includes an upper connecting portion, a lower connecting portion and a bending portion, the upper end of the bending portion is integrally formed with the upper connecting portion, the lower end of the bending portion is integrally formed with the lower connecting portion, and the first arc surface is located on the bending portion; the lower surface of the upper connecting portion is tightly fixed to the upper surface of the first spring leaf, and the upper surface of the lower connecting portion is tightly fixed to the lower surface of the first spring leaf.

5. The reed structure according to claim 4, characterized in that: The width of the upper connecting portion and / or the lower connecting portion is greater than the width of the bending portion.

6. The reed structure according to claim 4, characterized in that: The lower surface of the upper connection portion is fixedly connected to the upper surface of the first spring piece by brazing; the upper surface of the lower connection portion is fixedly connected to the lower surface of the first spring piece by brazing.

7. The reed structure according to any one of claims 1 to 6, characterized in that: The protective member is a silver plate.

8. The reed structure according to claim 2, characterized in that: The spring structure also includes a second spring and a spring sheet, the first spring sheet and the second spring sheet are both flat spring sheets, and the spring sheet is partially curved; the second spring sheet is stacked and fixed with the first spring sheet, and the second spring sheet is used to thicken the first spring sheet at the position pressed by the spring sheet; the support sheet is provided with a spring sheet slot on the side facing the moving contact, the spring sheet passes through the strip hole, one end of the spring sheet abuts against one end of the strip hole close to the moving contact, and the other end abuts against the spring sheet slot.

9. The reed structure according to claim 8, characterized in that: The first reed and the second reed are both provided with mounting holes for accommodating the moving contact, and the second reed is fastened to the first reed via the moving contact.

10. A micro switch, characterized in that: The invention comprises the reed structure as described in any one of claims 1 to 9, and further comprises a bottom filler, a cover, an upper contact piece, a lower contact piece, a button and a sealing ring, wherein the cover and the bottom filler form a chamber for accommodating the reed structure, one end of each of the upper contact piece, the lower contact piece and the support piece is located in the chamber, and the other end passes through the bottom filler to the outside of the micro switch, the cover is provided with a card hole for positioning the sealing ring, the card hole leads to the chamber, the sealing ring is sealedly connected to the button, one end of the button protrudes from the card hole and the sealing ring, and the other end extends into the chamber to press against the upper surface of the first reed.

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