Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a shell, an arc extinguishing system and a contact system, the shell comprises a bottom plate and a base, the bottom plate and the base form an arc extinguishing chamber cavity and a contact cavity which are arranged up and down, the arc extinguishing system is arranged in the arc extinguishing chamber cavity, and the contact system is arranged in the contact cavity; the contact system comprises a moving contact and a static contact which are correspondingly arranged; the moving contact comprises a first moving contact piece, the first moving contact piece is provided with a first moving contact, and the isolating device comprises a support fixedly arranged in the shell and a flexible isolating plate which is arranged on the support and used for stopping electric arc generated by separation of the moving contact and the static contact from moving towards the lower portion of the isolating device. The first movable contact piece penetrates through the flexible isolation plate, and the first movable contact is located above the flexible isolation plate. The isolating device has the advantages that part of arc gas can be effectively prevented from moving towards the lower part of the isolating device, so that arc rising is facilitated, the arc extinguishing efficiency is improved, and the arc extinguishing effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a switch. Background Art

[0002] Switches are crucial electrical components in power distribution lines, shutting off the current they carry to disconnect the circuit and protect both the circuit and the equipment using it. Switches typically consist of a contact system and an arc-extinguishing system. The contact system, in turn, includes a moving contact and a stationary contact. The moving contact actuates to make contact with or separate from the stationary contact, thereby switching the switch on and off. When the switch is opened, an arc is generated between the moving and stationary contacts. The relatively high energy of this arc makes it difficult to disconnect the switch. Therefore, an arc-extinguishing system is required to extinguish the arc generated when the moving and stationary contacts separate. Only when the arc is extinguished can the circuit be disconnected.

[0003] When existing switches are disconnecting the circuit, most of the arc will enter the arc extinguishing system to be extinguished, but a small amount of arc will still be unable to enter the arc extinguishing system, thus posing certain safety hazards.

[0004] In view of this, it is necessary to reasonably improve the existing switch structure. Utility Model Content

[0005] The purpose of the utility model is to provide a switch, which can block part of the arc gas from moving downward to the cavity by adding an isolation device below the moving contact in the shell, which is beneficial to the rise of the arc, improves the arc extinguishing efficiency, and increases the arc extinguishing effect.

[0006] The purpose of the present utility model is achieved in this way. A switch comprises a shell, an arc extinguishing system, and a contact system. The shell comprises a bottom plate and a base. The bottom plate and the base constitute an arc extinguishing chamber cavity and a contact cavity arranged up and down. The arc extinguishing system is arranged in the arc extinguishing chamber cavity, and the contact system is arranged in the contact cavity; the contact system comprises corresponding moving contacts and static contacts; the moving contact comprises a first moving contact piece, a first moving contact point is arranged on the first moving contact piece, and an isolation device is also included. The isolation device comprises a bracket fixedly arranged in the shell and a flexible isolation plate arranged on the bracket for stopping the arc gas generated by the separation of the moving and static contacts from moving to the bottom of the isolation device, the first moving contact piece passes through the flexible isolation plate and the first moving contact point is located above the flexible isolation plate.

[0007] In a specific embodiment of the present invention, the movable contact further includes a second movable contact piece, the second movable contact piece is provided with a second movable contact point, and the second movable contact point is located below the flexible isolation plate.

[0008] In another specific embodiment of the present invention, the bracket is fixedly arranged on the bottom plate.

[0009] In another specific embodiment of the present invention, the bracket is fixedly arranged on the base.

[0010] In another specific embodiment of the present invention, the flexible isolation board is made of flexible material.

[0011] In another specific embodiment of the present invention, the flexible material is one of ceramic fiber and asbestos.

[0012] In a further specific embodiment of the present invention, the flexible isolation plate is wavy or serrated.

[0013] In a more specific embodiment of the present invention, one end of the first moving contact piece facing the arc extinguishing system passes through a through hole provided on the flexible isolation plate. When the moving contact and the static contact are separated, the first moving contact piece drives the flexible isolation plate to deform within the frame of the bracket.

[0014] In a further specific embodiment of the present invention, the moving contact also includes a contact bracket, and a pushing portion is provided on the contact bracket. The pushing portion passes through a through hole provided on the flexible isolation plate. When the moving contact and the static contact are separated, the pushing portion drives the flexible isolation plate to deform within the frame of the bracket.

[0015] Due to the adoption of the above structure, the present invention has the beneficial effect: by adding an isolation device below the first moving contact of the first moving contact piece in the shell, the isolation device can effectively block part of the arc gas from moving to the bottom of the isolation device, thereby facilitating the rise of the arc, improving the arc extinguishing efficiency, and increasing the arc extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an embodiment of the switch of the present invention;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the base plate and the moving contact of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the bracket of the utility model.

[0019] In the figure: 1. Shell, 11. Bottom plate, 12. Base, 13. Arc extinguishing chamber, 14. Contact chamber; 2. Contact system, 21. Moving contact, 211. First moving contact piece, 2111. First moving contact point, 212. Second moving contact piece, 213. Contact bracket; 3. Isolation device, 31. Bracket, 32. Flexible isolation plate, 321. Through hole; 4. Arc extinguishing system. DETAILED DESCRIPTION

[0020] The specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments does not limit the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as within the scope of protection of the present invention.

[0021] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings. They are only used to facilitate the description of the technical solution provided by the present invention and to simplify the description in conjunction with the drawings. Therefore, they should not be understood as a special limitation on the technical solution provided by the present invention.

[0022] See also Figure 1 、 Figure 2 and Figure 3 The utility model relates to a switch, which includes a shell 1, an arc extinguishing system 4, and a contact system 2. The shell 1 includes a bottom plate 11 and a base 12. The bottom plate 11 and the base 12 are spliced ​​together to form a cavity. The cavity includes an arc extinguishing chamber cavity 13 and a contact cavity 14, wherein the arc extinguishing chamber cavity 13 is located above the contact cavity 14, the arc extinguishing system 4 is arranged in the arc extinguishing chamber cavity 14, and the contact system 2 is arranged in the contact cavity 14. The contact system 2 includes correspondingly arranged moving contacts 21 and static contacts 22. The arc generated by the separation of the moving and static contacts enters the arc extinguishing system 4.

[0023] The movable contact 21 includes a first movable contact piece 211, on which a first movable contact point 2111 is disposed. The technical innovation of the present invention lies in the inclusion of an isolation device 3, comprising a bracket 31 fixedly mounted within the housing 1 and a flexible isolation plate 32 mounted on the bracket 31 to prevent arc gas generated by the separation of the movable and static contacts from moving downwardly from the isolation device 3. The first movable contact piece 211 passes through the flexible isolation plate 32, and the first movable contact point 2111 is located above the flexible isolation plate 32. Specifically, in the direction below the isolation device 3, that is, the direction of the contact cavity 14, in this embodiment, when the moving contact 21 and the static contact 22 are in contact, the moving contact 21 compresses the flexible isolation plate 32 during movement. When the moving contact 21 and the static contact 22 are separated, the moving contact 21 stretches the flexible isolation plate 32 during movement, that is, the flexible isolation plate 32 is spread out within the range of the bracket 31, similar to a curtain structure, so that the arc cannot enter the position below the flexible isolation plate 32, thereby preventing further ablation of the first moving contact piece 211.

[0024] Furthermore, if the movable contact 21 further includes a second movable contact piece 212, the first movable contact piece 211 can be considered an arc contact piece, while the second movable contact piece 212 can be considered a main contact piece. The second movable contact piece 212 is provided with a second movable contact point, which is located below the flexible isolation plate 32. When the movable contact 21 and the stationary contact 22 separate, the movable contact 21 stretches the flexible isolation plate 32 during movement, preventing the arc from entering the position below the flexible isolation plate 32, thereby preventing further ablation of the second movable contact piece 212.

[0025] The bracket 31 can be fixedly mounted on the bottom plate 11, and the flexible isolation plate 32 can be deformed within the range surrounded by the bracket. In this embodiment, a mounting groove is provided on the bottom plate 11, and the bracket 31 is snapped into the mounting groove.

[0026] The bracket 31 can also be fixedly mounted on the base 12. In this embodiment, a mounting groove is provided on the base, and the bracket 31 is snap-fitted into the mounting groove.

[0027] Of course, there are other ways to install the bracket 31, for example, it is also feasible to fix the bracket 31 on other places such as the busbar.

[0028] The flexible isolation plate 32 is made of a flexible material, such as but not limited to ceramic fiberboard, asbestos cloth, and other high-temperature resistant flexible materials. The shape of the flexible isolation plate 32 is not limited in any way. In this embodiment, it is preferably wavy or zigzag.

[0029] The flexible isolation plate 32 is deformed in this way: the end of the first moving contact piece 211 facing the arc extinguishing system 4 passes through the through hole 321 set on the flexible isolation plate 32. When the moving contact 21 and the static contact 22 are separated, the first moving contact piece 211 drives the flexible isolation plate 32 to deform within the frame of the bracket 31. The deformation means that the moving contact 21 stretches the flexible isolation plate 32 during the movement so that the flexible isolation plate is spread out within the range of the bracket 31.

[0030] The movable contact further includes a contact support 213, which is provided with a push portion (not shown in the figure). The push portion passes through a through hole 321 provided in the flexible isolation plate 32. When the movable contact 21 and the stationary contact 22 separate, the push portion causes the flexible isolation plate 32 to deform within the frame of the support 31. The deformation is caused by the movable contact 21 stretching the flexible isolation plate 32 during movement, causing the flexible isolation plate to spread within the range of the support 31. Preferably, the push portion is a protrusion.

Claims

1. A switch, comprising a housing (1), an arc extinguishing system (4), and a contact system (2), wherein the housing (1) comprises a bottom plate (11) and a base (12), the bottom plate (11) and the base (12) forming an arc extinguishing chamber cavity (13) and a contact cavity (14) arranged vertically, the arc extinguishing system (4) being arranged in the arc extinguishing chamber cavity (13), and the contact system (2) being arranged in the contact cavity (14); the contact system (2) comprising a correspondingly arranged movable contact (21) and a stationary contact (22); the movable contact (21) comprising a first movable contact piece (211), the first movable contact piece (211) being provided with a first movable contact point (2111), and characterized in that: The invention also includes an isolation device (3), wherein the isolation device (3) includes a bracket (31) fixedly arranged in the housing (1) and a flexible isolation plate (32) arranged on the bracket (31) for preventing the arc generated by the separation of the moving and static contacts from moving downwardly of the isolation device (3); the first moving contact piece (211) passes through the flexible isolation plate (32) and the first moving contact point (2111) is located above the flexible isolation plate (32).

2. A switch according to claim 1, characterized in that: The movable contact (21) further comprises a second movable contact piece (212), a second movable contact point is provided on the second movable contact piece (212), and the second movable contact point is located below the flexible isolation plate (32).

3. The switch according to claim 1, wherein: The bracket (31) is fixedly arranged on the bottom plate (11).

4. The switch according to claim 1, characterized in that: The bracket (31) is fixedly arranged on the base (12).

5. The switch according to claim 1, characterized in that: The flexible isolation plate (32) is made of flexible material.

6. A switch according to claim 5, characterized in that: The flexible material is one of ceramic fiber and asbestos.

7. The switch according to claim 1, characterized in that: The flexible isolation plate (32) is wavy or sawtooth-shaped.

8. A switch according to claim 1 or 2, characterized in that: One end of the first moving contact piece (211) facing the arc extinguishing system (4) passes through a through hole (321) provided on the flexible isolation plate (32); when the moving contact (21) and the static contact (22) are separated, the first moving contact piece (211) drives the flexible isolation plate (32) to deform within the frame of the bracket (31).

9. The switch according to claim 1, characterized in that: The movable contact further comprises a contact bracket (213), and a pushing portion is provided on the contact bracket (213). The pushing portion passes through a through hole (321) provided on the flexible isolation plate (32). When the movable contact (21) and the static contact (22) are separated, the pushing portion drives the flexible isolation plate (32) to deform within the frame of the bracket (31).

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