Push type anti-ablation switch

Abstract

The utility model discloses a kind of press type anti-ablation switches, it is related to switch technical field, solve the current in point contact state, high current density generates huge heat on contact resistance, prone to contact ablation problem;The utility model includes mounting seat and press plate, the inside of mounting seat is provided with chamber, fixed contact is provided in chamber, opening is opened on chamber, opening is opened in the top of fixed contact;Mounting seat is provided with movable contact by elastic member, the below of press plate is provided with contact part;Its purpose is, movable contact is supported by independently arranged elastic member, so that movable contact forms contact perpendicular motion, avoid moving contact along arc trajectory contact, movable contact is vertically guided and suspended limit by elastic member, ensure that fixed contact is formed plane contact with below, increase contact area, press plate is pressed down by elastic member buffering and correcting pressure direction after, reduce contact resistance and arc risk.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to a push-button type anti-burning switch. Background Technology

[0002] As a fundamental component of human-computer interaction and circuit control, the core function of a switch button is to reliably connect or disconnect a circuit through mechanical action. Throughout the long-term development of push-button switches, the contact method and reliability of their internal contacts have been the core focus of technological evolution. Existing switch button contact technology is mainly based on a press-lever-rocker mechanical structure. While this structure is mature and cost-controllable, it also presents some inherent technical challenges. When a user presses the button, the applied force is typically transmitted through the button cap to an internal movable component. This movable component rotates around a fixed fulcrum or axis. The nature of this rotational motion determines the dynamic contact at its end. The trajectory of a point is an arc. When the moving contact moves downward along this arc to contact the fixed stationary contact, at the moment of contact, the two will first collide in the tangential direction of the arc trajectory. Since the moving contact approaches the plane of the stationary contact at an angle, the initial contact often occurs in a very small area or a point on the edge of the moving contact, rather than the entire contact surface, i.e., point contact. In the point contact state, the current flowing through the contact is forced to concentrate through a tiny contact area, causing the current density in that area to increase sharply. The high current density generates huge heat on the contact resistance, which can easily cause the temperature of the tiny contact point to rise sharply, leading to contact erosion problems. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a push-button type anti-ablation switch. The pressure plate is hinged to the mounting base and generates a rotational motion when pressed. The movable contact is supported by an independently set elastic element, so that the contact formed by the movable contact moves vertically, avoiding the movable contact from contacting along an arc trajectory. The movable contact is vertically guided by the elastic element and suspended and limited, so that it is detached from the fixed contact when not pressed. The contact rod can adaptively adjust the angle to ensure that it forms a planar contact with the fixed contact below, increasing the contact area. After the pressure plate is pressed down, the elastic element buffers and corrects the pressure direction, reducing contact resistance and arc risk.

[0004] The technical solution adopted in this utility model is as follows: A push-button type anti-ablation switch includes a mounting base and a button. The button includes a pressure plate. One side of the mounting base is hinged to the pressure plate. The mounting base has a cavity inside, and a fixed contact is disposed within the cavity. An opening is formed in the cavity above the fixed contact. A movable contact is disposed on the mounting base via an elastic element. The bottom of the elastic element is fixed to the mounting base, and the movable contact is located above the opening. The button also includes a contact portion disposed below the pressure plate. The contact portion can contact the movable contact by pressing the pressure plate.

[0005] Using the above technical solution, the pressure plate is hinged to the mounting base, generating rotational motion when pressed. The movable contact is supported by an independently set elastic element, so that the contact formed by the movable contact moves vertically, avoiding the movable contact from contacting along an arc trajectory. The movable contact is vertically guided by the elastic element and suspended and limited, so that it is detached from the fixed contact when not pressed. The contact rod can adaptively adjust its angle to ensure planar contact with the fixed contact below, increasing the contact area. After the pressure plate is pressed down, the elastic element buffers and corrects the pressure direction, reducing contact resistance and arc risk.

[0006] Preferably, the elastic element is a spring, and the movable contact includes a contact block and a contact rod arranged coaxially. The lower part of the contact block is fixed to the top part of the contact rod, the top part of the spring is located at the lower part of the contact block, the bottom end of the spring is fixed to the upper part of the mounting base, the size of the top part of the spring is smaller than the size of the contact block, and the contact rod is located inside the spring.

[0007] By adopting the above technical solution, the contact block increases the force-bearing area of ​​the contact rod, the top of the spring abuts against the lower part of the contact block, dispersing the pressure and avoiding local deformation. The contact rod is built into the spring, and the spring also acts as a guide mechanism to ensure the vertical movement trajectory. The size of the top of the spring is smaller than the size of the contact block to prevent the spring from disengaging and maintain the pre-compression force.

[0008] Preferably, the coil diameter of the spring increases sequentially from top to bottom.

[0009] Using the above technical solution, the tapered design of the spring, which is narrow at the top and wide at the bottom, can provide stronger support at the bottom and fully resist the lateral force caused by the tilt of the pressure plate. The increasing coil diameter provides non-linear elastic force, ensuring sufficient pressure at the moment of contact.

[0010] Preferably, a cover is fixed on the mounting base, the cover communicates with the chamber, the contact rod movably passes through the cover and is coaxially arranged with it, and the spring is sleeved on the outside of the cover. In the initial state, the distance between the bottom end of the contact rod and the fixed contact point is less than the distance between the lower part of the contact block and the top end of the cover.

[0011] With the above technical solution, the bottom of the contact rod is closer to the fixed contact point in the initial state, ensuring that the contact rod can contact the fixed contact point and forcibly form a vertical contact. The cover acts as a rigid guide sleeve for the contact rod and the spring, which can effectively prevent the horizontal deviation of the spring.

[0012] Preferably, the cover is in the shape of a two-step frustum, the upper part of the cover is smaller than the lower part of the cover, and the bottom of the cover is a vertical cylinder.

[0013] By adopting the above technical solution, the cover is smaller at the top and larger at the bottom, forming a stepped stop surface, which limits the excessive downward pressure of the spring and the contact block, avoids spring overload, provides a long guide stroke, and enhances the anti-deviation capability.

[0014] Preferably, the lower end of the contact portion is arc-shaped.

[0015] With the above technical solution, the lower end of the contact part is arc-shaped, and the contact with the movable contact point changes from line contact to surface contact, which disperses local stress, and the arc surface adapts to the rotation angle change of the pressure plate.

[0016] Preferably, the lower end of the contact portion is cross-shaped, the cross shape is arc-shaped, and the convex surface of the arc faces the movable contact.

[0017] Using the above technical solution, each cross arm is equivalent to a miniature cantilever beam. When subjected to pressure, it bends independently and automatically compensates for the tilt angle of the pressure plate. No matter how the pressure plate is tilted, the resultant force transmitted to the moving contact always remains vertical. When the pressure is overloaded, the elastic bending of the cross arm can absorb the impact and prevent the moving contact from being over-pressurized.

[0018] The lower part of the pressure plate is provided with an arc-shaped cover, which gradually expands outward from the upper part to the lower part to match the shape of the spring.

[0019] Using the above technical solution, the arc-shaped cover can provide partial protection for the components below it. The arc-shaped cover also acts as a limiting element for the spring. When pressed, the arc surface that gradually expands outward from the top to the bottom forms a space to accommodate the spring.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The pressure plate is hinged to the mounting base, generating a rotational motion when pressed. The movable contact is supported by an independently set elastic element, which allows the contact formed by the movable contact to move vertically, preventing the movable contact from contacting along an arc trajectory. The movable contact is vertically guided by the elastic element and suspended and limited, so that it is detached from the fixed contact when not pressed. The contact rod can adaptively adjust its angle to ensure planar contact with the fixed contact below, increasing the contact area. After the pressure plate is pressed down, the elastic element buffers and corrects the pressure direction, reducing contact resistance and the risk of arcing. Attached Figure Description

[0021] This utility model will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a three-dimensional structural diagram of a push-button type anti-ablation switch according to this utility model; Figure 2 This is a schematic diagram of the right side view of a push-button anti-ablation switch according to this utility model; Figure 3 This is a utility model Figure 2 A schematic diagram of the cross-sectional structure; Figure 4 This is a top-view three-dimensional structural diagram of a push-button anti-ablation switch according to this utility model; Figure 5 This is a utility model Figure 4 Schematic diagram of the cross-sectional structure in the middle; Figure 6 This is a schematic diagram of the structure of the pressure plate and the contact part of this utility model.

[0022] Figure Labels

[0023] 1-Active contact, 101-Contact block, 102-Contact rod, 2-Spring, 3-Mounting base, 4-Fixed contact, 5-Contact part, 6-Pressure plate, 7-Cover, 8-Arc-shaped cover. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The following is combined Figures 1-6 This utility model will be described in detail. Example 1

[0026] A push-button type anti-ablation switch, see attached document. Figures 1-2The device includes a mounting base 3 and a button. The button includes a pressure plate 6. One side of the mounting base 3 is hinged to the pressure plate 6. The mounting base 3 has an internal chamber containing a fixed contact 4. The chamber has an opening above the fixed contact 4. A movable contact 1 is provided on the mounting base 3 via an elastic element. The bottom of the elastic element is fixed to the mounting base 3, and the movable contact 1 is located above the opening. The button also includes a contact portion 5 located below the pressure plate 6. Pressing the pressure plate 6 allows it to contact the movable contact 1. The pressure plate 6 is hinged to the mounting base 3 and rotates when pressed. The movable contact 1 is supported by an independently set elastic element, which makes the contact formed by the movable contact 1 move vertically, preventing the movable contact from contacting along an arc trajectory. The movable contact 1 is vertically guided by the elastic element and suspended and limited, so that it is detached from the fixed contact 4 when it is not pressed, ensuring that it forms a planar contact with the fixed contact 4 below, increasing the contact area. After the pressure plate 6 is pressed down, the elastic element buffers and corrects the pressure direction, reducing contact resistance and the risk of arcing.

[0027] The bottom of the fixed contact 4 penetrates the cavity, and the bottom of the fixed contact is electrically connected to other external components.

[0028] The mounting base 3 and the pressure plate 6 are made of PBT material.

[0029] In this embodiment, refer to the appendix. Figure 3 The elastic element is a spring 2. The movable contact 1 includes a contact block 101 and a contact rod 102 coaxially arranged. The lower part of the contact block 101 is fixed to the top of the contact rod 102. The top of the spring 2 is located at the lower part of the contact block 101. The bottom end of the spring 2 is fixed to the upper part of the mounting base 3. The size of the top of the spring 2 is smaller than the size of the contact block 101. The contact rod 102 is located inside the spring 2 and can adaptively adjust its angle. The contact block 101 increases the force-bearing area of ​​the contact rod 102. The top of the spring 2 abuts against the lower part of the contact block 101 to distribute pressure and avoid local deformation. The contact rod 102 is built into the spring 2. The spring 2 also acts as a guide mechanism to ensure the vertical movement trajectory. The size of the top of the spring 2 is smaller than the size of the contact block 101 to prevent the spring 2 from disengaging and maintain the pre-compression force.

[0030] The material of spring 2 is C5191W-H supplementary material.

[0031] In this embodiment, the coil diameter of the spring 2 increases from top to bottom; the tapered design of the spring 2, which is narrow at the top and wide at the bottom, can make the bottom support stronger and can fully resist the lateral force caused by the tilt of the pressure plate 6. The increasing coil diameter provides non-linear elastic force to ensure sufficient pressure at the moment of contact.

[0032] In this embodiment, a cover 7 is fixed on the mounting base 3. The cover 7 communicates with the chamber. The contact rod 102 movably passes through the cover 7 and is coaxially arranged with it. The spring 2 is sleeved on the outside of the cover 7. In the initial state, the distance between the bottom end of the contact rod 102 and the fixed contact point 4 is less than the distance between the lower part of the contact block 101 and the top end of the cover 7. In the initial state, the bottom end of the contact rod 102 is closer to the fixed contact point 4, ensuring that the contact rod 102 can contact the fixed contact point 4 and forcibly form a vertical contact. The cover 7 serves as a rigid guide sleeve for the contact rod 102 and the spring 2, which can effectively prevent the horizontal deviation of the spring 2.

[0033] In this embodiment, refer to the appendix. Figures 4-5 The cover 7 is in the shape of a two-step frustum. The upper part of the cover 7 is smaller than the lower part of the cover 7. The bottom of the cover 7 is a vertical cylinder. The cover 7 is smaller at the top and larger at the bottom, forming a stepped stop surface, which limits the excessive downward pressure of the spring 2 and the contact block 101, avoids overload of the spring 2, provides a long guide stroke, and enhances the anti-deviation ability.

[0034] The cover 7 is made of engineering plastic, and the bottom of the cover 7 is bonded to or integrally formed with the mounting base 3.

[0035] The gap between the inner wall of the cover 7 and the contact rod 102 is 0.1 mm.

[0036] The material of the cover 7 is PAG30. Example 2

[0037] In this embodiment, refer to the appendix. Figure 6 The lower end of the contact part 5 is arc-shaped; the lower end of the contact part 5 is arc-shaped, and the contact with the movable contact point 1 changes from line contact to surface contact, which disperses local stress, and the arc surface adapts to the rotation angle change of the pressure plate 6.

[0038] The radius of curvature of the arc is R6.5.

[0039] In this embodiment, the lower end of the contact part 5 is cross-shaped, and the cross-shaped part is arc-shaped with the convex surface of the arc facing the active contact 1. Each cross arm is equivalent to a miniature cantilever beam, which bends independently after being pressed, automatically compensating for the tilt angle of the pressure plate 6. No matter how the pressure plate 6 is tilted, the resultant force transmitted to the active contact 1 always remains vertical. When the pressure is overloaded, the elastic bending of the cross arm can absorb the impact and prevent the active contact 1 from being over-pressurized. Example 3

[0040] The lower part of the pressure plate is provided with an arc-shaped cover 8, which gradually expands outward from the top to the bottom to match the shape of the spring 2. The arc-shaped cover 8 can provide partial protection for the components below it, and the arc-shaped cover 8 plays a role in matching and limiting the spring 2. When pressed, the arc surface that gradually expands outward from the top to the bottom forms a space to accommodate the spring 2.

[0041] The steps for using a push-button type anti-ablation switch are as follows: Step 1: The pressure plate 6 is in the raised state, and the cross-shaped contact part 5 is not in contact with the contact block 101 of the movable contact 1; the bottom end of the contact rod 102 of the movable contact 1 is less than the distance between the contact block 101 and the top of the cover 7 from the stationary contact of the fixed contact 4. At this time, the conical spring 2 is in a pre-compressed state, and the contact block 101 is suspended and limited above the cover 7. Step 2: Press the pressure plate 6 with your finger. The pressure plate 6 rotates and presses down around the hinge point. The lower end of the contact part 5 contacts the contact block 101 of the movable contact point 1. The cross arm deforms independently and automatically compensates for the tilt angle of the pressure plate 6, converting the resultant force into vertical pressure, eliminating the lateral component force caused by the hinge rotation, and ensuring that the pressure is vertically downward. Step 3: After being pressed, the contact block 101 moves downward, pushing the contact rod 102 vertically through the cover 7. The contact rod 102 first contacts the fixed contact 4 to form a surface contact conductive circuit. The conical spring 2 continuously provides vertical pressure to avoid local heating and burning. Step 4: Release the pressure plate 6, the conical spring 2 releases its stored energy, pushing the contact block 101 upwards. The contact rod 102 then vertically disengages from the fixed contact point 4, remaining suspended and restoring a safe distance from the fixed contact point 4. It should be noted that: The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A push-button type anti-ablation switch, comprising a mounting base (3) and a button, the button comprising a pressure plate (6), one side of the mounting base (3) being hinged to the pressure plate (6), the mounting base (3) having a cavity inside, and a fixed contact (4) being disposed within the cavity, characterized in that, The chamber has an opening above the fixed contact (4); the mounting base (3) has a movable contact (1) provided by an elastic element, the bottom of the elastic element is fixed to the mounting base (3), and the movable contact (1) is located above the opening; the button also includes a contact part (5), which is located below the pressure plate (6), and the contact part (5) can contact the movable contact (1) by pressing the pressure plate (6).

2. A push-button type anti-erosion switch according to claim 1, characterized in that, The elastic element is a spring (2). The movable contact (1) includes a contact block (101) and a contact rod (102) arranged coaxially. The lower part of the contact block (101) is fixed to the top of the contact rod (102). The top of the spring (2) is located at the lower part of the contact block (101). The bottom end of the spring (2) is fixed to the upper part of the mounting base (3). The size of the top of the spring (2) is smaller than the size of the contact block (101). The contact rod (102) is located inside the spring (2).

3. A push-button type anti-ablation switch according to claim 2, characterized in that, The coil diameter of the spring (2) increases from top to bottom.

4. A push-button type anti-erosion switch according to claim 2, characterized in that, A cover (7) is fixed on the mounting base (3). The cover (7) communicates with the chamber. The contact rod (102) moves through the cover (7) and is coaxial with it. The spring (2) is sleeved on the outside of the cover (7). In the initial state, the distance between the bottom end of the contact rod (102) and the fixed contact point (4) is less than the distance between the lower part of the contact block (101) and the top end of the cover (7).

5. A push-button type anti-erosion switch according to claim 4, characterized in that, The cover (7) is in the shape of a two-step frustum, the upper part of the cover (7) is smaller than the lower part of the cover (7), and the bottom of the cover (7) is a vertical cylinder.

6. A push-button type anti-erosion switch according to any one of claims 1 to 5, characterized in that, The lower end of the contact portion (5) is arc-shaped.

7. A push-button type anti-ablation switch according to claim 6, characterized in that, The lower end of the contact part (5) is cross-shaped, and the cross-shaped part is arc-shaped with the convex surface of the arc facing the active contact (1).

8. A push-button type anti-erosion switch according to claim 3, characterized in that, The lower part of the pressure plate (6) is provided with an arc-shaped cover (8), which gradually expands outward from the upper part to the lower part, so as to match the shape of the spring (2).

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