An explosion-proof micro switch with buffer function

Abstract

This utility model discloses an explosion-proof micro switch with a buffer function, including a bottom shell and a top cover. An elastic component and a foot component for triggering the switch are embedded in the bottom shell and top cover. A buffer cylinder is provided on the top cover, and a push switch is movably inserted into the buffer cylinder. A dust cover is provided at the upper end of the push switch, covering the upper port of the buffer cylinder, and the lower end abuts against the elastic component. This utility model, through the coordinated sealing design of the dust cover and the buffer cylinder, effectively prevents dust from entering the switch, avoiding dust explosion caused by contact with residual electric arc. Simultaneously, by extending the sealing path of the buffer cylinder, the overall explosion-proof protection capability under dust conditions is effectively improved. By setting an annular buffer rubber ring inside the buffer cylinder to match the fixing rod, the impact force when the fixing rod slides can be effectively reduced. At the same time, the push switch's pressing lever and the second locking head of the toggle piece are stably engaged, improving both the switch's operating feel and enhancing explosion-proof reliability.

Description

Technical Field

[0001] This utility model relates to the field of micro switch technology, specifically to an explosion-proof micro switch with a buffer function. Background Technology

[0002] A microswitch, also known as a sensitive switch, is a precision electromechanical component that triggers the switching of a circuit through a tiny physical displacement. It can complete the rapid switching of contacts in an extremely short time (milliseconds) to achieve instantaneous circuit connection and disconnection. However, microswitches inevitably generate electric arcs and sparks when their contacts open and close. In hazardous environments such as petrochemical plants, coal mines, and natural gas transportation, where flammable gases, dust, or vapors are present, these arcs, sparks, or high temperatures can easily ignite surrounding flammable and explosive materials, causing explosions. Therefore, microswitches used in these environments need to have explosion-proof structures and functions.

[0003] In the prior art, utility model patent with patent number CN202420047697.7 discloses an explosion-proof micro switch, including a housing and an elastic support plate fixedly disposed on the upper end of the housing. A switch moving block is disposed below the housing. A limiting housing is slidably connected to the side of the switch moving block away from the elastic support plate and extends into its interior. Primary separation elimination plates are fixedly disposed on opposite sides of the limiting housing. There are several primary separation elimination plates. A secondary isolation elimination plate is fixedly disposed between every two primary separation elimination plates. There are several secondary isolation elimination plates.

[0004] The aforementioned patent discloses a microswitch with explosion-proof functionality. It uses multiple extinguishing plates to isolate and extinguish electric arcs, preventing excessive arc compression from causing overheating and explosion within the device. However, this explosion-proof microswitch still generates arcs during use. When used in a dusty environment, there is still a risk of explosion, as residual arcs can easily ignite dust, triggering a dust explosion. Therefore, the overall explosion-proof capability of this microswitch under dusty conditions remains insufficient and requires further improvement. Utility Model Content

[0005] The purpose of this invention is to provide an explosion-proof micro switch with a buffer function, which aims to improve the problem that existing explosion-proof micro switches still have the risk of residual electric arc igniting dust and causing an explosion under dust conditions, and the overall explosion-proof protection capability is insufficient.

[0006] This utility model is implemented as follows: An explosion-proof micro switch with a buffer function includes a bottom shell and a top cover. The bottom shell and the top cover are fitted with an elastic component and a foot component for triggering the switch. A buffer cylinder is provided on the top cover. A push switch is movably inserted in the buffer cylinder. A dust cover is provided on the upper end of the push switch. The dust cover covers the upper port of the buffer cylinder and the lower end abuts against the elastic component.

[0007] Preferably, the foot assembly includes a first foot, a second foot, and a third foot, which are vertically embedded in the bottom shell from left to right, with the upper end of the first foot extending above the second foot.

[0008] Preferably, the elastic component includes a toggle piece, a stop piece, and a spring. One end of the stop piece rotatably abuts against the third foot piece, and the other end is located between the upper ends of the first foot piece and the second foot piece. One end of the toggle piece rotatably abuts against the third foot piece, and the other end abuts against the lower end of the push switch. One end of the spring is connected to the toggle piece, and the other end is connected to the stop piece.

[0009] Preferably, the third foot component includes a first slot, and the end of the abutment piece near the third foot component is provided with a third locking head that matches the first slot. The third locking head rotates and abuts against the first slot, and is elastically abutted by a spring.

[0010] Preferably, the abutting piece includes an abutting head, and the abutting head is provided at the end of the abutting piece away from the third locking head, and the abutting head is located between the upper end of the first pin and the upper end of the second pin.

[0011] Preferably, the actuating piece includes a first locking head, and the third foot is provided with a second locking groove. The first locking head rotates and abuts against the second locking groove, and is elastically abutted by a spring.

[0012] Preferably, the buffer cylinder includes a groove, the upper end of the buffer cylinder is provided with a groove surrounding the push switch, and the lower end of the dust cover extends into the groove.

[0013] Preferably, the push switch further includes a fixing rod, the upper end of which is fitted with a dust cover and the lower end of which is provided with a pressing lever, and the fixing rod is slidably inserted into the buffer cylinder; the toggle piece is provided with a second locking head at the end near the push switch, and the pressing lever is locked in the second locking head.

[0014] Preferably, the buffer cylinder is provided with an annular buffer ring that fits the outer periphery of the fixing rod to reduce the impact when the fixing rod slides and improve the sealing performance.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model effectively prevents dust from entering the switch through the synergistic sealing design of the dust cover and the buffer cylinder, avoiding dust explosion caused by contact between dust and residual electric arc; at the same time, by extending the sealing path of the buffer cylinder, the dustproof effect is further improved, and the overall explosion protection capability under dust conditions is effectively improved while ensuring smooth pressing.

[0016] 2. This utility model effectively reduces the impact force when the fixed rod slides by setting an annular buffer rubber ring inside the buffer cylinder to match the fixed rod, and reduces the mechanical vibration when the contacts open and close; at the same time, the pressing lever of the push switch is stably engaged with the second locking head of the toggle piece to ensure a smooth triggering process, which not only improves the feel of the switch operation, but also enhances the explosion-proof reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the elastic component and foot component of this utility model embedded in the bottom shell; Figure 3 This is a schematic diagram of the structure of the top cover of this utility model; Figure 4 This is a schematic diagram of the push-button switch of this utility model; Figure 5 This is a schematic diagram of the foot component of this utility model being embedded in the bottom shell; Figure 6 This is a utility model Figure 2 Schematic diagram of the structure at point A; Figure 7 This is a schematic diagram of the structure of the toggle piece of this utility model; Figure 8 This is a schematic diagram of the structure of the abutment piece of this utility model.

[0018] In the diagram: 1. Bottom shell; 2. Top cover; 201. Buffer cylinder; 202. Groove; 3. Push switch; 301. Fixing rod; 302. Dust cover; 303. Push lever; 4. First pin; 5. Second pin; 6. Third pin; 601. First slot; 602. Second slot; 7. Actuating piece; 701. First latch; 702. Second latch; 8. Abutment piece; 801. Abutment joint; 802. Third latch; 9. Spring. Detailed Implementation

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details: Example 1

[0021] like Figure 1 , Figure 2 and Figures 5-8As shown, an explosion-proof micro switch with a buffer function includes a base shell 1 and a top cover 2. The base shell 1 and top cover 2 are fitted with an elastic component and a pin assembly for triggering the switch. The pin assembly includes a first pin 4, a second pin 5, and a third pin 6, which are vertically embedded in the base shell 1 from left to right. All three are integrally stamped from C5191 phosphor bronze (copper content ≥99.5%), with a tin-plated surface (plating thickness 5-8μm) for corrosion resistance. The cross-section is a 1.5×2.0mm rectangle, and the embedded ends are provided with barbs. The structure (barb height 0.3mm) is fixed to the bottom shell 1 by injection molding insert process, with a pull-out force ≥50N; the upper end of the first prong 4 extends above the second prong 5, and the elastic component includes a toggle piece 7, a stop piece 8, and a spring 9. One end of the stop piece 8 rotates and abuts against the third prong 6, and the other end is located between the upper end of the first prong 4 and the upper end of the second prong 5; the upper end of the first prong 4 is a normally closed contact, and the upper end of the second prong 5 is a normally open contact, both of which are welded and formed by silver-nickel alloy (AgNi10), with a contact convex surface radius of 1.0mm and a surface roughness Ra≤ 0.1μm; the third pin 6 serves as a common support end, with its first slot 601 being an arc-shaped groove (radius 2.0mm, depth 1.5mm) and its second slot 602 being a U-shaped groove (opening width 2.2±0.05mm, groove depth 3.0mm), the center distance between the two slots being 4.0mm, ensuring the stability of the rotation trajectory of the elastic component; one end of the toggle piece 7 rotates and abuts against the third pin 6, and the other end abuts against the lower end of the push switch 3; one end of the spring 9 is connected to the toggle piece 7, and the other end is connected to the abutment piece 8. The third pin 6 includes the first slot 601, and the abutment piece 8 is close to the third pin 6. One end of the foot piece 6 is provided with a third locking head 802 that is adapted to the first locking groove 601. The third locking head 802 rotates and abuts against the first locking groove 601 and is elastically abutted by the spring 9. The abutting piece 8 includes an abutting head 801. The abutting piece 8 is provided with an abutting head 801 at the end away from the third locking head 802. The abutting head 801 is located between the upper end of the first foot piece 4 and the upper end of the second foot piece 5. The actuating piece 7 includes a first locking head 701. The third foot piece 6 is provided with a second locking groove 602. The first locking head 701 rotates and abuts against the second locking groove 602 and is elastically abutted by the spring 9.

[0022] like Figures 1-4 and Figure 7As shown, a buffer cylinder 201 is provided on the upper cover 2, and a push switch 3 is movably inserted in the buffer cylinder 201. A dust cover 302 is provided on the upper end of the push switch 3, covering the upper port of the buffer cylinder 201, and the lower end abuts against the elastic component. The buffer cylinder 201 includes a groove 202, and the upper end of the buffer cylinder 201 is provided with a groove 202 surrounding the push switch 3. The lower end of the dust cover 302 extends into the groove 202. The push switch 3 also includes a fixing rod. 301. A dust cover 302 is fitted onto the upper end of the fixing rod 301, and a pressing lever 303 is provided at the lower end. The fixing rod 301 is slidably inserted into the buffer cylinder 201. A second locking head 702 is provided at the end of the toggle piece 7 near the pressing switch 3, and the pressing lever 303 is locked into the second locking head 702. An annular buffer rubber ring adapted to the outer circumference of the fixing rod 301 is provided inside the buffer cylinder 201 to reduce the impact when the fixing rod 301 slides and improve the sealing performance. The buffer cylinder 201 is 2 cm high, which not only ensures a longer sealing path and avoids increasing the difficulty of dust entering the switch, but also further enhances the dustproof effect. The upper cover 2 is integrally injection molded, with an inner diameter of 8±0.1mm and a height of 20±0.1mm (i.e., 2 cm). The inner wall has an annular groove (2.0mm wide, 1.0mm deep) for inserting an annular buffer ring (silicone rubber, Shore hardness 60±5, inner diameter 7.8mm, outer diameter 8.2mm, interference fit 0.1-0.2mm). The upper groove 202 is 3.0mm wide and 1.5mm deep, forming an interference fit (0.2mm interference) with the lower end of the dust cover 302. The fixing rod 301 is a φ6±0.05mm 304 stainless steel rod, 25±0.1mm long, with an annular groove (1.0mm wide, 0.5mm deep) on its upper outer circumference. The dust cover 302 is fixed with a diameter of φ2.0±0.05mm. The pressing rod 303 is a cylindrical structure with chamfered ends (chamfer radius 0.5mm) and is welded perpendicularly to the fixing rod 301 (welding strength ≥10N). The dust cover 302 is made of TPU material (thickness 0.8mm), has a bell-shaped structure, and has an annular rib on the inner side of the lower end (fitting the fixing rod groove). The upper end has an arc design (radius 10mm), which combines dust protection and tactile comfort. The annular buffer rubber ring in the buffer cylinder 201 and the fixing rod 301 form a dynamic sealing structure with a sliding friction of 0.5-1.0N, which ensures smooth pressing and axial sealing, preventing dust from entering the switch through the gap of the fixing rod. Example 2

[0023] like Figure 1 , Figure 2 and Figures 5-8As shown, an explosion-proof micro switch with a buffer function includes a base shell 1 and a top cover 2. The base shell 1 and top cover 2 are fitted with an elastic component and a foot assembly for triggering the switch. The foot assembly includes a first foot 4, a second foot 5, and a third foot 6, which are vertically embedded in the base shell 1 from left to right. The upper end of the first foot 4 extends above the second foot 5. The elastic component includes a toggle piece 7, a stop piece 8, and a spring 9. One end of the stop piece 8 rotatably abuts against the third foot 6, and the other end is located between the upper ends of the first foot 4 and the second foot 5. One end of the toggle piece 7 rotatably abuts against the third foot 6, and the other end abuts against a spring located below the push switch 3. The spring 9 is connected to the actuating piece 7 at one end and to the abutting piece 8 at the other end. The third foot piece 6 includes a first slot 601. The abutting piece 8 is provided with a third locking head 802 that is adapted to the first slot 601 at one end near the third foot piece 6. The third locking head 802 rotates and abuts against the first slot 601 and is elastically abutted by the spring 9. The abutting piece 8 includes an abutting head 801. The abutting piece 8 is provided with an abutting head 801 at one end away from the third locking head 802. The abutting head 801 is located between the upper end of the first foot piece 4 and the upper end of the second foot piece 5. The actuating piece 7 includes a first locking head 701. The third foot piece 6 is provided with a second slot 602. The first locking head 701 rotates and abuts against the second slot 602 and is elastically abutted by the spring 9.

[0024] like Figures 1-4 and Figure 7 As shown, a buffer cylinder 201 is provided on the upper cover 2, and a push switch 3 is movably inserted in the buffer cylinder 201. A dust cover 302 is provided on the upper end of the push switch 3, covering the upper port of the buffer cylinder 201, and the lower end abuts against the elastic component. The buffer cylinder 201 includes a groove 202, and the upper end of the buffer cylinder 201 is provided with a groove 202 surrounding the push switch 3. The lower end of the dust cover 302 extends into the groove 202. The push switch 3 also includes a fixing rod. 301, the upper end of the fixing rod 301 is fitted with a dust cover 302, and the lower end is provided with a pressing lever 303. The fixing rod 301 is slidably inserted into the buffer cylinder 201. The end of the toggle piece 7 near the pressing switch 3 is provided with a second locking head 702. The pressing lever 303 is locked in the second locking head 702. The buffer cylinder 201 is provided with an annular buffer rubber ring that is adapted to the outer periphery of the fixing rod 301 to reduce the impact when the fixing rod 301 slides and improve the sealing performance.

[0025] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An explosion-proof micro switch with a buffer function, comprising a base shell (1) and a top cover (2), characterized in that, The bottom shell (1) and the top cover (2) are fitted with an elastic component and a foot component for triggering the switch. A buffer cylinder (201) is provided on the top cover (2). A push switch (3) is movably inserted in the buffer cylinder (201). A dust cover (302) is provided at the upper end of the push switch (3). The dust cover (302) covers the upper port of the buffer cylinder (201) and the lower end abuts against the elastic component.

2. The explosion-proof micro switch with buffer function according to claim 1, characterized in that, The foot assembly includes a first foot piece (4), a second foot piece (5), and a third foot piece (6). The first foot piece (4), the second foot piece (5), and the third foot piece (6) are vertically embedded in the bottom shell (1) from left to right. The upper end of the first foot piece (4) extends above the second foot piece (5).

3. The explosion-proof micro switch with buffer function according to claim 2, characterized in that, The elastic component includes a toggle piece (7), a stop piece (8), and a spring (9). One end of the stop piece (8) rotates and abuts against the third foot piece (6), and the other end is located between the upper end of the first foot piece (4) and the upper end of the second foot piece (5). One end of the toggle piece (7) rotates and abuts against the third foot piece (6), and the other end abuts against the lower end of the push switch (3). One end of the spring (9) is connected to the toggle piece (7), and the other end is connected to the stop piece (8).

4. The explosion-proof micro switch with buffer function according to claim 3, characterized in that, The third foot piece (6) includes a first slot (601). The abutment piece (8) is provided with a third head (802) that is adapted to the first slot (601) at one end near the third foot piece (6). The third head (802) rotates and abuts against the first slot (601) and is elastically abutted by a spring (9).

5. The explosion-proof micro switch with buffer function according to claim 4, characterized in that, The abutting piece (8) includes an abutting head (801). The abutting piece (8) is provided with an abutting head (801) at one end away from the third locking head (802). The abutting head (801) is located between the upper end of the first pin (4) and the upper end of the second pin (5).

6. The explosion-proof micro switch with buffer function according to claim 3, characterized in that, The actuating piece (7) includes a first locking head (701), and the third foot piece (6) is provided with a second locking groove (602). The first locking head (701) rotates and abuts against the second locking groove (602), and is elastically abutted by a spring (9).

7. The explosion-proof micro switch with buffer function according to claim 1, characterized in that, The buffer cylinder (201) includes a groove (202), and the upper end of the buffer cylinder (201) is provided with a groove (202) surrounding the push switch (3), and the lower end of the dust cover (302) extends into the groove (202).

8. The explosion-proof micro switch with buffer function according to claim 6, characterized in that, The push switch (3) also includes a fixing rod (301), the upper end of which is fitted with a dust cover (302), and the lower end is provided with a pressing lever (303). The fixing rod (301) is slidably inserted into the buffer cylinder (201). The toggle piece (7) is provided with a second locking head (702) at one end near the push switch (3), and the pressing lever (303) is locked in the second locking head (702).

9. The explosion-proof micro switch with buffer function according to claim 8, characterized in that, The buffer cylinder (201) is provided with an annular buffer rubber ring that is adapted to the outer periphery of the fixing rod (301) to reduce the impact when the fixing rod (301) slides and improve the sealing performance.

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