Switch

Abstract

The utility model discloses a switch, which comprises a base, a handle and a transmission rod, the handle is rotatably arranged on the base, a static contact piece and a movable contact piece are arranged in the base, transmission parts are arranged on two sides of the handle, one end of the transmission rod is rotatably connected with the transmission parts, and the other end of the transmission rod is rotatably connected with the movable contact piece. One end of the transmission rod is rotationally connected with the transmission part of the handle, the other end of the transmission rod is rotationally connected with the movable contact piece, the transmission rod plays a transmission role between the handle and the movable contact piece, and the contact areas of the transmission rod, the handle and the movable contact piece are very small, so that the heat transfer area during closing is reduced, the temperature rise of the handle is reduced, and the service life of the switch is prolonged. The handle is ensured not to deform during long-time switching on, and the stability and reliability of the product are improved.

Description

Technical Field

[0001] This utility model relates to a switch. Background Technology

[0002] Existing protective switches generally include a base, a top cover, a handle, a moving contact, and a stationary contact. For example, Chinese invention patent CN108389748B discloses a protective switch including a body, a stationary contact, a moving contact, and a handle. The stationary and moving contacts are respectively disposed on the body, and the handle is rotatably mounted on the body. The moving contact has an arched portion, and the top surface of the arched portion has a first slope and a second slope corresponding to the two sides opposite to its top corner. The moving contact has a moving contact head, and the second slope is further away from the moving contact head than the first slope. The handle has a cam portion for driving the moving contact to achieve opening and closing. This cam portion contacts and engages with the arched portion of the moving contact. In the open state, the cam portion of the handle abuts against the first slope of the arched portion; in the closed state, the cam portion of the handle abuts against the second slope of the arched portion. When closing, the temperature of the moving contact rises, and the contact area between the cam portion and the second slope of the handle is large. If the current is high and the switch is closed for a long time, the handle may soften and deform. This invention patent has two safety hazards: First, when closing the circuit, if a large fault current occurs, the moving contact may stick to the stationary contact (this is a common occurrence in low-voltage electrical appliances). In this case, when the handle is turned to open the circuit, the cam part of the handle separates from the moving contact, and the spring force cannot separate the moving and stationary contacts. This results in the handle being in the open position while the moving contact is in the closed state, posing a significant safety hazard. Second, when the fault current increases or the moving and stationary contacts oxidize, the temperature of the moving contact rises. The cam part of the handle and the second slope surface of the moving contact have a large contact area and good heat transfer effect. After a long period of closing the circuit, the handle may soften and deform, reducing the contact pressure and causing the switch to fail. Utility Model Content

[0003] In view of the shortcomings of existing technology, this utility model provides a switch.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a switch, including a base and a handle, the handle being rotatably mounted on the base, a stationary contact and a moving contact being provided inside the base, and a transmission rod being provided on both sides of the handle, with one end of the transmission rod being rotatably connected to the transmission part and the other end being rotatably connected to the moving contact.

[0005] The transmission part has a first connecting hole on its side, the moving contact has a second connecting hole, the transmission rod is U-shaped, and the two ends of the transmission rod are respectively rotatably engaged with the first connecting hole and the second connecting hole.

[0006] The movable contact has a first recessed portion and a second recessed portion in the middle of the first recessed portion. The second recessed portion and the first recessed portion are recessed in opposite directions. The concave surfaces of the first recessed portion and the second recessed portion are combined to form a second connecting hole.

[0007] The base is connected to a middle cover, which has a through hole through which the handle protrudes. The middle cover has a baffle corresponding to the transmission rod inside.

[0008] A reset elastic element is provided between the moving contact and the base.

[0009] The base has symmetrical support seats on both sides of the handle. Each support seat has a shaft hole. The inner sides of the two support seats have slots that communicate with the shaft holes. The slots have a first inclined surface. The thickness of the first inclined surface gradually increases from the outside to the inside. The handle has a rotating shaft. The rotating shaft and the shaft hole are rotatably connected.

[0010] The movable contact is provided with positioning plates on both sides, and the base is provided with mounting seats symmetrically on both sides of the movable contact. The mounting seat is provided with a first opening, and the positioning plates can slide up and down and swing within the first opening. A stop block is provided on the first opening, and an insertion port communicating with the first opening is formed between the stop block and the mounting seat.

[0011] The mounting base and the base are integrally injection molded.

[0012] The beneficial effects of this utility model are as follows: This utility model features a transmission rod with one end rotatably connected to the handle's transmission part and the other end rotatably connected to the moving contact. The transmission rod acts as a transmission mechanism between the handle and the moving contact. The moving contact does not directly contact the handle; there is a gap between them. The contact area between the transmission rod, the handle, and the moving contact is very small, reducing the heat transfer area during closing, lowering the handle's temperature rise, ensuring the handle will not deform during prolonged closing, and improving the stability of the switch. The connection between the transmission rod, the handle, and the moving contact adopts a linkage design. As soon as the handle is opened, the moving contact separates from the stationary contact, eliminating the safety hazard of the moving contact sticking to the stationary contact while the handle is in the open position, thus improving the reliability of the switch. Attached Figure Description

[0013] Figure 1 This is a front view of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model after the cover is removed;

[0015] Figure 3 This is a schematic diagram of the moving contact structure of this utility model;

[0016] Figure 4 This is a cross-sectional view of the open gate state of this utility model;

[0017] Figure 5 This is a cross-sectional view of the present invention in the closed state;

[0018] Figure 6 for Figure 1 A cross-sectional view along the AA direction;

[0019] Figure 7 This is a schematic diagram of the structure of the cover in this utility model;

[0020] Figure 8 This is a cross-sectional view of the pivot point of the handle of this utility model. Detailed Implementation

[0021] like Figures 1-8 As shown, a switch includes a base 1 and a handle 2. The handle 2 is rotatably mounted on the base 1. The base 1 contains a stationary contact 6 and a moving contact 3. It also includes a transmission rod 7. Transmission parts 21 are located on both sides of the handle 2. One end of the transmission rod 7 is rotatably connected to the transmission part 21, and the other end is rotatably connected to the moving contact 3. When opening or closing the switch, rotating the handle 2 causes the transmission part 21 to drive the moving contact 3 to rotate via the transmission rod 7, thus opening or closing the switch.

[0022] The transmission part 21 has a first connecting hole 22 on its side, the moving contact 3 has a second connecting hole 31, the transmission rod 7 is U-shaped, and the two ends of the transmission rod 7 are respectively rotatably engaged with the first connecting hole 22 and the second connecting hole 31.

[0023] The movable contact 3 is provided with a first recessed portion 32, and a second recessed portion 33 is provided in the middle of the first recessed portion 32. The second recessed portion 33 and the first recessed portion 32 are recessed in opposite directions. The opposing concave surfaces of the first recessed portion 32 and the second recessed portion 33 combine to form a second connecting hole 31. The second connecting hole 31 of this structure is formed by bending on the movable contact 3, which is simple in structure, easy to process and low in cost.

[0024] The base 1 is connected to a middle cover 52 and an upper cover 51. The middle cover 52 has a through hole 53 through which the handle 2 passes. The middle cover 52 has a baffle 54 corresponding to the transmission rod 7 inside. The baffle 54 can prevent the transmission rod 7 from sliding outward.

[0025] A reset elastic element 4 is provided between the moving contact 3 and the base 1. In this embodiment, the reset elastic element 4 is a spring.

[0026] In the switch disclosed in CN108389748B, protrusions extend from opposite sides of the moving contact, and the base is provided with guide grooves that mate with the two protrusions of the moving contact one by one. The protrusions are confined in the guide grooves and can move up and down along the guide grooves. Because a spring is provided between the moving contact and the base, the spring will give the moving contact an upward force and drive the handle to move, making it impossible to position the moving contact during assembly. Without the aid of auxiliary tooling, the contact parameters cannot be tested, which brings difficulties to production and assembly.

[0027] In this embodiment, the base 1 has symmetrical support seats 11 on both sides of the handle 2. Each support seat 11 has a shaft hole 12. The inner surfaces of the two support seats 11 facing each other have slots 13 communicating with the shaft holes 12. A first inclined surface 14 is provided within the slot 13, and the thickness of the first inclined surface 14 gradually increases from the outside to the inside. The handle 2 has a rotating shaft 23, which is rotatably connected to the shaft hole 12. When assembling the handle 2, the rotating shaft 23 is pressed down from the slot 13, and the handle 2 pushes the support seats 11 apart through the first inclined surface 14. Then, the rotating shaft 23 is inserted into the shaft hole 12. After insertion, the rotating shaft 23 only rotates and does not disengage from the shaft hole 12, making switch assembly easier. The first inclined surface 14 serves as a guide and transition.

[0028] The movable contact 3 has positioning plates 34 on both sides, and the base 1 has mounting seats 15 symmetrically arranged on both sides of the movable contact 3. The mounting seats 15 have a first opening 16, and the positioning plates 34 can slide up and down and swing within the first opening 16. The first opening 16 has a stop block 17, and the stop block 17 and the mounting seat 15 form an insertion port 18 communicating with the first opening 16. The mounting seat 15 and the base 1 are integrally injection molded. When installing the movable contact 3, after the positioning plate 34 is vertically inserted along the insertion port 18, the movable contact 3 is laid flat. Due to the upward force of the spring, the positioning plate 34 will abut against the upper edge of the first opening 16, so that the positioning plate 34 is restricted within the first opening 16, and the movable contact 3 will not shake.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Simple modifications and substitutions made by those skilled in the art without departing from the spirit and scope of this utility model are within its protection scope.

Claims

1. A switch, comprising a base and a handle, the handle being rotatably mounted on the base, and the base containing a stationary contact and a moving contact, characterized in that, It also includes a transmission rod, and the handle has transmission parts on both sides. One end of the transmission rod is rotatably connected to the transmission part, and the other end is rotatably connected to the moving contact.

2. A switch as described in claim 1, characterized in that, The transmission part has a first connecting hole on its side, the moving contact has a second connecting hole, the transmission rod is U-shaped, and the two ends of the transmission rod are respectively rotatably engaged with the first connecting hole and the second connecting hole.

3. A switch as described in claim 2, characterized in that, The movable contact has a first recessed portion and a second recessed portion in the middle of the first recessed portion. The second recessed portion and the first recessed portion are recessed in opposite directions. The concave surfaces of the first recessed portion and the second recessed portion are combined to form a second connecting hole.

4. A switch as described in claim 2, characterized in that, The base is connected to a middle cover, which has a through hole through which the handle protrudes. The middle cover has a baffle corresponding to the transmission rod inside.

5. A switch as described in claim 1, characterized in that, A reset elastic element is provided between the moving contact and the base.

6. A switch as described in claim 5, characterized in that, The base has symmetrical support seats on both sides of the handle. Each support seat has a shaft hole. The inner sides of the two support seats have slots that communicate with the shaft holes. The slots have a first inclined surface. The thickness of the first inclined surface gradually increases from the outside to the inside. The handle has a rotating shaft. The rotating shaft and the shaft hole are rotatably connected.

7. A switch as described in claim 5, characterized in that, The movable contact is provided with positioning plates on both sides, and the base is provided with mounting seats symmetrically on both sides of the movable contact. The mounting seat is provided with a first opening, and the positioning plates can slide up and down and swing within the first opening. A stop block is provided on the first opening, and an insertion port communicating with the first opening is formed between the stop block and the mounting seat.

8. A switch as described in claim 7, characterized in that, The mounting base and the base are integrally injection molded.

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