Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising a base and an arc extinguish chamber device installed in the base, a breaking pole A and a breaking pole B are adjacently arranged in the base side by side, and the arc extinguish chamber device comprises two arc extinguish chambers which are installed in the breaking pole A and the breaking pole B respectively and used for extinguishing breaking arcs. The exhaust channels of the two arc extinguish chambers are arranged on the side away from the adjacent arc extinguish chamber in a bias mode. The device has the advantages that the arc extinguish chambers of adjacent phases can be prevented from being broken down on adjacent exhaust channel sides; the arc can move towards the exhaust channel at one side after entering the arc extinguish chamber, equivalently increases the depth of the cutting area of the grid sheet, can prevent the arc from being broken down at the exhaust channel side after being further cooled, and improves the breaking reliability of the switch.

Description

Technical Field

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

[0002] With the development of new energy technologies, users have put forward higher requirements on low-voltage electrical components. Especially with the continuous development and growth of photovoltaic power plants, the performance indicators of protection components required by power plants have also been higher.

[0003] In the prior art, when there are disconnecting poles at both ends of the load connected to the DC switch, the current directions in the two disconnecting poles connected to the load are opposite, so that the arc current directions in the breakpoints of the two disconnecting poles are opposite, and the arcs repel each other. If the moving speeds of the two arcs are different, the slower arc will be repelled by the faster moving arc, and thus cannot enter the arc extinguishing chamber, and the breaking performance of the switch is reduced. The breaking performance of the switch can be improved by adopting a method of connecting multiple breakpoints in series. When all the disconnecting poles of the DC switch are at one end of the load, the current directions of all the disconnecting poles can be made the same by connecting the load side of one disconnecting pole and the power supply side of another disconnecting pole in series, thereby ensuring that the arcs in the disconnecting poles can reliably enter the arc extinguishing chamber. However, this method still has some problems, such as the problem of breakdown at the front of the grid, especially the grid located on the exhaust channel side at the front end of the arc extinguishing chamber. The arcs of adjacent phases attract each other and then pass through the arc extinguishing chamber, enter the front end of the arc extinguishing chamber and break down on the adjacent exhaust channel side, which will cause unreliable breaking. Specifically, if Figures 1 to 3 The switch has adjacent disconnecting poles A and B in the base 1, and the current directions of the disconnecting poles A and B are the same. Arc extinguishing chambers 2 are respectively installed in the disconnecting poles A and B, wherein one arc extinguishing chamber 2 in the disconnecting pole A symmetrically forms a pair of first exhaust channels c on the left and right sides of the front end, and the other arc extinguishing chamber 2 in the disconnecting pole B symmetrically forms a pair of second exhaust channels f on the left and right sides of the front end. The arc extinguishing chamber 2 is provided with a shielding plate 3 at the gas outlet position, and the shielding plate 3 is provided with corresponding exhaust grooves 31 at the positions corresponding to each exhaust channel. The high-temperature gas generated when the switch is disconnected is discharged from the exhaust grooves 31 on the shielding plate 3 through four channels. Since the current directions of the disconnecting poles A and B are the same, the arcs generated by the disconnecting poles A and B attract each other, pass through the arc extinguishing chamber 2 and enter the front end of the arc extinguishing chamber 2, and will break down on the adjacent sides of a first exhaust channel c and a second exhaust channel f.

[0004] In view of the above-mentioned prior art, it is necessary to improve the structure of the existing switch. Utility Model Content

[0005] The utility model aims to provide a switch which can prevent the electric arc from breaking down on the exhaust passage side, thereby improving the breaking reliability.

[0006] The purpose of the utility model is achieved in this way. A switch comprises a base and an arc extinguishing chamber device installed in the base, wherein a disconnecting pole A and a disconnecting pole B are arranged side by side and adjacent to each other in the base, and the arc extinguishing chamber device comprises two arc extinguishing chambers respectively installed in the disconnecting pole A and the disconnecting pole B for extinguishing the disconnecting arc, and the exhaust channels of the two arc extinguishing chambers are both offset to a side away from the adjacent arc extinguishing chamber.

[0007] In a specific embodiment of the present invention, the exhaust passage is arranged between the arc extinguishing chamber and the base.

[0008] In another specific embodiment of the present invention, the arc extinguishing chamber includes a pair of side walls and a group of arc extinguishing grids arranged in an array between the pair of side walls, the array direction of the group of arc extinguishing grids extends along the height direction of the switch, the arc extinguishing grids form a notch on one side of the air outlet, and the notches of the group of arc extinguishing grids are arranged longitudinally to form the exhaust channel.

[0009] In another specific embodiment of the present invention, recesses extending along the height direction of the switch and respectively offset to one side away from the adjacent arc extinguishing chamber are provided on the base at the position of the air outlet of the arc extinguishing chamber, and the recesses form the exhaust channel.

[0010] In another specific embodiment of the utility model, it also includes a shielding plate arranged between the base and the arc extinguishing chamber, and the shielding plate is provided with exhaust grooves at intervals at positions corresponding to the exhaust channels of the arc extinguishing chamber, and the broken arc is discharged from the inside of the switch through the exhaust grooves.

[0011] The utility model sets an exhaust channel on one side of the arc extinguishing chamber. Compared with the prior art, the utility model has the following beneficial effects: firstly, it can prevent the arc extinguishing chamber of the adjacent phase from breaking down on the adjacent exhaust channel side; secondly, after the arc enters the arc extinguishing chamber, it can move to one side of the exhaust channel, which equivalently increases the cutting area depth of the grid. After further cooling the arc, it can prevent the arc from breaking down on the exhaust channel side, thereby improving the disconnection reliability of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of an existing switch;

[0013] Figure 2 It is a structural schematic diagram of the arc extinguishing chamber and the exhaust passage of the existing switch;

[0014] Figure 3 This is a wiring diagram of an existing switch;

[0015] Figure 4 This is a schematic diagram of the overall structure of the switch of the utility model;

[0016] Figure 5It is a structural schematic diagram of the arc extinguishing chamber and the exhaust channel thereof of the utility model;

[0017] Figure 6 It is a schematic diagram of the disconnected gas path in the switch of the utility model.

[0018] In the figure: 1. base, 11. cavity, 12. positioning part; 2. arc extinguishing chamber, 2a. first arc extinguishing chamber, 2b. second arc extinguishing chamber, 21. side wall, 22. arc extinguishing grid, 221. notch; 3. shielding plate, 31. exhaust groove; c. first exhaust channel; f. second exhaust channel. DETAILED DESCRIPTION

[0019] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0020] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are referring to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solutions provided by the present utility model.

[0021] The utility model relates to a switch, which is a DC switch, comprising a base 1, a shaft system, an operating mechanism, a contact system and an arc extinguishing chamber device. The operating mechanism is installed in the base 1 for closing and opening the circuit breaker, and the shaft system receives the action of the operating mechanism and transmits it to the contact system to realize the opening or closing operation of the switch.

[0022] like Figure 4 As shown, a plurality of cavities 11 are provided on the base 1 of the switch, and the arc extinguishing chamber device includes an arc extinguishing chamber 2 for extinguishing the breaking arc and a shielding plate 3 provided at the front end of the arc extinguishing chamber 2 at the air outlet for shielding the breaking arc, and the arc extinguishing chamber 2 and the shielding plate 3 are installed together in the cavity 11 of the base 1. A positioning portion 12 is also provided on the base 1, and after the shielding plate 3 is installed in place, the positioning portion 12 positions the shielding plate 3. Of course, the cavity 11 on the base 1 can be set as a closed structure at the position of the air outlet of the arc extinguishing chamber 2 to shield the breaking arc, which is not shown in the figure. In this structure, the shielding plate 3 does not need to be installed. Embodiment 1:

[0023] See you next time Figure 4 This embodiment is described with a two-pole switch. A disconnecting pole A and a disconnecting pole B are arranged side by side in the base 1, and the disconnecting pole A is located on the right side of the disconnecting pole B. The disconnecting pole A and the disconnecting pole B are respectively provided with the arc extinguishing chamber 2 and the shielding plate 3.

[0024] Compared with the prior art, in order to prevent the arc from breaking down at the front end of the arc extinguishing chamber 2, this embodiment forms exhaust channels on the mutually distant sides of the gas outlets of the two arc extinguishing chambers 2. That is, for the disconnecting pole A and the disconnecting pole B, the exhaust channels are only provided on one side. The exhaust channels are provided on the base 1 or the arc extinguishing chamber 2.

[0025] See also Figure 5 Combined with Figure 4 In this embodiment, the exhaust channel is arranged on the arc extinguishing chamber 2. The arc extinguishing chamber 2 includes a pair of side walls 21 and a group of arc extinguishing grids 22 arranged in an array between the pair of side walls 21, and the array direction of the group of arc extinguishing grids 22 extends along the height direction of the switch. The arc extinguishing grid 22 is formed with a notch 221 at one end of the gas outlet, and the notches 221 of the group of arc extinguishing grids 22 are arranged in a longitudinal array to form the exhaust channel. The shielding plate 3 is provided with exhaust grooves 31 at intervals corresponding to the notches 221 of the arc extinguishing chamber 2, and the disconnected arc is discharged from the inside of the switch through the exhaust grooves 31. The high-pressure gas generated when the switch is disconnected rises through the exhaust channel and is quickly discharged at the position of the exhaust groove 31. The shape of the exhaust groove 31 can be circular, oval or square, preferably oval. The material of the shielding plate 3 is a gas-generating material. When the switch is disconnected, the arc erodes the gas-generating material, and the gas-generating material generates gas, which increases the gas pressure in the arc extinguishing chamber 2, increases the arc voltage during the disconnection process, and accelerates the arc extinguishing speed.

[0026] The first arc-extinguishing chamber 2a in the disconnecting pole A forms the notch 221 on the right side of the air outlet of the arc-extinguishing grid 22, and the notches 221 of a group of arc-extinguishing grids 22 of the first arc-extinguishing chamber 2a constitute a first exhaust channel c; the second arc-extinguishing chamber 2b in the disconnecting pole B forms the notch 221 on the left side of the air outlet of the arc-extinguishing grid 22, and the notches 221 of a group of arc-extinguishing grids 22 of the second arc-extinguishing chamber 2b constitute a second exhaust channel f.

[0027] See also Figure 6 Combined with Figure 3 Since the current directions of the disconnecting poles A and B are the same, the arcs generated when the switch is disconnected attract each other, and the disconnected arcs and the high-temperature gases generated during the disconnection are discharged through the first exhaust channel c and the second exhaust channel f. Therefore, after the arc and the high-temperature gases reach the front end of the arc extinguishing chamber 2, they need to pass through the horizontal paths g and h in the arc extinguishing chamber 2 and then pass through the first exhaust channel c and the second exhaust channel f respectively, and finally be discharged to the outside of the switch through the exhaust groove 31 on the baffle plate 3. This process can further cool the high-temperature gas and avoid the problem of breakdown in the adjacent first and second exhaust channels c and f in the prior art. Embodiment 2:

[0028] In this embodiment, the main difference from Embodiment 1 is that the exhaust channel is arranged on the base 1, which is not shown in the figure. On the base 1, at the position of the outlet of the arc extinguishing chamber 2, there are recesses extending along the height direction of the switch and respectively offset to one side away from the adjacent arc extinguishing chamber 2, and the recesses form the exhaust channel. Specifically, on the base 1, a recess is arranged at the right position of the outlet of the first arc extinguishing chamber 2a in the disconnecting pole A, and the recess forms the first exhaust channel c; and a recess is arranged at the left position of the outlet of the second arc extinguishing chamber 2b in the disconnecting pole B, and the recess forms the second exhaust channel f. No recess is arranged on the arc extinguishing grid 22. Its implementation process is consistent with that of Embodiment 1 and will not be repeated. Embodiment 3:

[0029] In addition to two-pole switches, this design is also applicable to three-pole switches. In this embodiment, the switch includes disconnecting poles A, B, and C (not shown). The arc extinguishing chamber 2 includes a first arc extinguishing chamber 2a and a second arc extinguishing chamber 2b. Specifically, the first arc extinguishing chamber 2a is installed in the disconnecting pole A, and the second arc extinguishing chamber 2b is installed in the disconnecting poles B and C respectively. The current directions of the disconnecting poles A and B are the same, and the current direction of the disconnecting pole C is opposite to that of the disconnecting poles A and B. Its implementation process is consistent with that of Example 1 and will not be repeated here.

Claims

1. A switch, comprising a base (1) and an arc extinguishing chamber device installed in the base (1), wherein a disconnecting pole A and a disconnecting pole B are arranged side by side and adjacent to each other in the base (1), and the arc extinguishing chamber device comprises two arc extinguishing chambers (2) respectively installed in the disconnecting pole A and the disconnecting pole B for extinguishing the disconnecting arc, characterized in that: The exhaust passages of the two arc extinguishing chambers (2) are both biased to a side away from the adjacent arc extinguishing chamber (2).

2. A switch according to claim 1, characterized in that The exhaust passage is arranged between the arc extinguishing chamber (2) and the base (1).

3. A switch according to claim 2, characterized in that The arc extinguishing chamber (2) comprises a pair of side walls (21) and a group of arc extinguishing grids (22) arranged in an array between the pair of side walls (21); the array direction of the group of arc extinguishing grids (22) extends along the height direction of the switch; the arc extinguishing grids (22) form a notch on one side of the gas outlet; the notches of the group of arc extinguishing grids (22) are arranged in a longitudinal array to form the exhaust channel.

4. A switch according to claim 2, characterized in that On the base (1), recesses are provided at the positions of the gas outlets of the arc extinguishing chambers (2), extending along the height direction of the switch and respectively offset to the side away from the adjacent arc extinguishing chambers (2), and the recesses form the exhaust passages.

5. A switch according to claim 1, characterized in that The invention also comprises a shielding plate (3) arranged between the base (1) and the arc extinguishing chamber (2), wherein the shielding plate (3) is provided with exhaust grooves (31) at intervals at positions corresponding to the exhaust passages of the arc extinguishing chamber (2), and the disconnected arc is discharged from the interior of the switch through the exhaust grooves (31).

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