Switch

Abstract

The switch comprises a base and a handle, the handle is rotationally arranged on the base, a static contact piece and a movable contact piece are arranged in the base, the switch further comprises a transmission rod, transmission parts are arranged on the two sides of the handle, one end of the transmission rod is rotationally connected with the transmission parts, and the other end of the transmission rod is rotationally 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 small, so that the heat transfer area during closing is reduced, and the temperature rise of the handle is reduced; 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] The present invention relates to a switch. Background Art

[0002] The protection switches in the prior art generally include a base, an upper cover, a handle, a moving contact, and a static contact. For example, in the Chinese invention patent disclosed in the publication number CN108389748B, a protection switch includes a body, a static contact, a moving contact, and a handle. The static contact and the moving contact are respectively arranged on the body, and the handle is rotatably arranged on the body; an arched portion is provided on the moving contact, and the top surface of the arched portion has a first slope and a second slope at positions corresponding to the two sides opposite to the top end corner. A moving contact head is provided on the moving contact, and the second slope is farther from the moving contact head than the first slope; a cam portion is provided on the handle for driving the moving contact to move to realize opening and closing. The cam portion contacts and cooperates 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, and 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 of the handle and the second slope is large. If the current is large and the switch is closed for a long time, the handle may soften and deform. There are two potential safety hazards in this invention patent: First, when closing, if a large fault current occurs, the moving contact head may stick to the static contact head (the situation where the moving contact head and the static contact head of a low-voltage electrical appliance stick together occurs from time to time). At this time, when the handle is rotated to open, the cam portion of the handle is separated from the moving contact, and the elastic force of the spring cannot separate the moving contact head and the static contact head. In this way, the handle is in the open position while the moving contact head is in the closed state, posing a great safety hazard; Second, when the fault current increases or the moving and static contact heads are oxidized, the temperature of the moving contact rises, and the contact area between the cam portion of the handle and the second slope of the moving contact is large, and the heat transfer effect is good. When the switch is closed for a long time, the handle may soften and deform, reducing the contact pressure and causing the switch to fail. Summary of the Invention

[0003] Aiming at the deficiencies of the existing technology, the present invention provides a switch.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A switch includes a base and a handle. The handle is rotatably arranged on the base. A static contact and a moving contact are arranged in the base. The switch further includes a transmission rod. Transmission portions are provided on both sides of the handle. One end of the transmission rod is rotatably connected to the transmission portion, and the other end is rotatably connected to the moving contact.

[0005] A first connection hole is provided on the side surface of the transmission portion, and a second connection hole is provided on the moving contact. The transmission rod is U-shaped, and both ends of the transmission rod are rotatably matched with the first connection hole and the second connection hole respectively.

[0006] The moving contact member is provided with a first concave portion, and a second concave portion is provided in the middle of the first concave portion. The directions of concavity of the second concave portion and the first concave portion are opposite. The concave surfaces of the first concave portion and the second concave portion facing each other combine to form a second connection hole.

[0007] A middle cover is connected to the base. The middle cover is provided with a through hole, and the handle passes through the through hole. A baffle corresponding to the transmission rod is provided inside the middle cover.

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

[0009] On both sides of the handle, the base is symmetrically provided with support seats. Each of the two support seats is provided with a shaft hole. The inner side surfaces of the two support seats facing each other are provided with slots communicating with the shaft holes. A first inclined surface portion is provided in the slots. The thickness of the first inclined surface portion gradually increases from outside to inside. The handle is provided with a rotating shaft, and the rotating shaft is rotatably connected to the shaft hole.

[0010] Positioning plates are provided on both sides of the moving contact member. On both sides of the moving contact member, the base is symmetrically provided with mounting seats. The mounting seats are provided with first openings. The positioning plates can slide up and down and swing in the first openings. A stop block is provided on the first openings. An insertion opening communicating with the first openings is formed between the stop block and the mounting seats.

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

[0012] Advantages of the present invention: One end of the transmission rod provided in the present invention is rotatably connected to the transmission part of the handle, and the other end is rotatably connected to the moving contact member. The transmission rod plays a transmission role between the handle and the moving contact member. The moving contact member and the handle do not directly contact each other, and there is a gap between them. The contact areas of the transmission rod with the handle and the moving contact member are very small, reducing the heat transfer area during closing, lowering the temperature rise of the handle, ensuring that the handle will not deform during long-term closing, and improving the stability of the switch. The connection between the transmission rod and the handle and the moving contact member adopts a linkage design. As long as the handle is opened, the moving contact will separate from the static contact, eliminating the potential safety hazard that the handle is in the open position while the moving contact is stuck to the static contact and the moving contact is in the closed state, and improving the reliability of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2 is the structural schematic diagram of the present invention after removing the cover;

[0015] Figure 3 is the structural schematic diagram of the moving contact member of the present invention;

[0016] Figure 4 is the sectional view of the present invention in the open state;

[0017] Figure 5Cross-sectional view of the closing state of the present invention;

[0018] Figure 6 is Figure 1 Cross-sectional view in the A-A direction in

[0019] Figure 7 Schematic structural diagram of the cover in the present invention;

[0020] Figure 8 Cross-sectional view at the rotating shaft of the handle of the present invention. Detailed implementation manner

[0021] As Figures 1-8 shown, a switch includes a base 1 and a handle 2. The handle 2 is rotatably arranged on the base 1. A static contact 6 and a moving contact 3 are arranged in the base 1. It further includes a transmission rod 7. Transmission parts 21 are arranged 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 and closing, the handle 2 is rotated, and the transmission part 21 drives the moving contact 3 to rotate through the transmission rod 7 to achieve opening or closing.

[0022] A first connection hole 22 is arranged on the side surface of the transmission part 21. The moving contact 3 is provided with a second connection hole 31. The transmission rod 7 is U-shaped, and both ends of the transmission rod 7 are rotatably matched with the first connection hole 22 and the second connection hole 31 respectively.

[0023] The moving contact 3 is provided with a first concave part 32. A second concave part 33 is arranged in the middle of the first concave part 32. The direction of the depression of the second concave part 33 is opposite to that of the first concave part 32. The concave surfaces of the first concave part 32 and the second concave part 33 facing each other form the second connection hole 31. The second connection hole 31 of this structure is formed by bending on the moving contact 3, with a simple structure, convenient processing and low cost.

[0024] The middle cover 52 and the upper cover 51 are connected to the base 1. The middle cover 52 is provided with a through hole 53, and the handle 2 passes through the through hole 53. A baffle 54 corresponding to the transmission rod 7 is arranged in the middle cover 52. The baffle 54 can prevent the transmission rod 7 from sliding outwards.

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

[0026] In the switch disclosed in CN108389748B, convex parts respectively extend from opposite sides of the moving contact. The base is provided with guide grooves that cooperate with the two convex parts of the moving contact one by one. The convex parts are limited in the guide grooves and can move up and down along the guide grooves. Because a spring is arranged between the moving contact and the base, the spring will give the moving contact an upward force and drive the handle to move at the same time, 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, support seats 11 are symmetrically arranged on both sides of the handle 2 of the base 1. Each of the two support seats 11 is provided with a shaft hole 12. Grooves 13 communicating with the shaft holes 12 are provided on the inner sides of the two support seats 11 facing each other. A first inclined surface portion 14 is provided in the groove 13. The thickness of the first inclined surface portion 14 gradually increases from outside to inside. The handle 2 is provided with a rotating shaft 23, and the rotating shaft 23 is rotatably connected to the shaft hole 12. When assembling the handle 2, the rotating shaft 23 is pressed down from the groove 13, and the handle 2 pushes the two support seats 11 on both sides away through the first inclined surface portion 14 downward. Then the rotating shaft 23 is snapped into the shaft hole 12. After being snapped in, the rotating shaft 23 can only rotate and will not disengage from the shaft hole 12, making the switch assembly easier. The first inclined surface portion 14 plays a guiding and transitional role.

[0028] Positioning plates 34 are provided on both sides of the moving contact 3. Mounting seats 15 are symmetrically arranged on both sides of the moving contact 3 on the base 1. The mounting seats 15 are provided with first openings 16. The positioning plates 34 can slide up and down and swing in the first openings 16. A stop block 17 is provided on the first opening 16. An insertion opening 18 communicating with the first opening 16 is formed between the stop block 17 and the mounting seat 15. The mounting seats 15 and the base 1 are integrally injection-molded. When installing the moving contact 3, after the positioning plates 34 are vertically placed into the insertion opening 18, the moving contact 3 is then laid flat. Due to the upward force of the spring, the positioning plates 34 will abut against the upper edges of the first openings 16, restricting the positioning plates 34 within the first openings 16 and preventing the moving contact 3 from shaking.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, simple modifications and substitutions by ordinary technicians in the art are within the protection scope of the present invention.

Claims

1. A switch, comprising a base and a handle, the handle is rotatably arranged on the base, and a static contact and a moving contact are arranged in the base, characterized in that, It further includes a transmission rod. Transmission parts are provided on both sides of the handle. One end of the transmission rod is rotatably connected to the transmission part, and the other end is rotatably connected to the moving contact piece.

2. The switch according to claim 1, wherein A first connection hole is provided on the side of the transmission part, and a second connection hole is provided on the moving contact piece. The transmission rod is U-shaped, and both ends of the transmission rod are rotatably matched with the first connection hole and the second connection hole respectively.

3. A switch according to claim 2, characterized in that, The moving contact piece is provided with a first concave portion, and a second concave portion is provided in the middle of the first concave portion. The direction of the concave of the second concave portion is opposite to that of the first concave portion. The opposite concave surfaces of the first concave portion and the second concave portion form the second connection hole.

4. A switch according to claim 2, wherein, A middle cover is connected to the base. The middle cover is provided with a through hole, and the handle passes through the through hole. A baffle corresponding to the transmission rod is provided inside the middle cover.

5. A switch according to claim 1, characterized in that, A reset elastic member is provided between the moving contact piece and the base.

6. A switch according to claim 5, characterized in that, The base is symmetrically provided with support seats on both sides of the handle. Each of the two support seats is provided with a shaft hole. The inner sides of the two support seats facing each other are provided with slots communicating with the shaft holes. A first inclined surface portion is provided in the slots. The thickness of the first inclined surface portion gradually increases from the outside to the inside. The handle is provided with a rotating shaft, and the rotating shaft is rotatably connected to the shaft hole.

7. A switch according to claim 5, characterized in that, Positioning plates are provided on both sides of the moving contact piece. The base is symmetrically provided with mounting seats on both sides of the moving contact piece. The mounting seats are provided with first openings. The positioning plates can slide up and down and swing in the first openings. A stop block is provided on the first opening. An insertion port communicating with the first opening is formed between the stop block and the mounting seat.

8. A switch according to claim 7, characterized in that, The mounting seat and the base are integrally injection-molded.

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