A dustproof structure of an arc extinguishing chamber and a disconnecting switch

Abstract

This invention provides a dustproof structure for an arc-extinguishing chamber. The arc-extinguishing chamber includes a cover mounted on its top. The top of the cover has a mounting groove with multiple vents communicating with the interior of the arc-extinguishing chamber. One side of the mounting groove is connected to the first side wall of the cover via a rotating groove. The dustproof cover includes a plate and a rotating shaft connected by a connector. The rotating shaft is rotatably mounted in the rotating groove. The plate can be embedded in the mounting groove and blocks the multiple vents. The connector also has a first limiting surface. The base has a cavity for accommodating the arc-extinguishing chamber. The cavity includes a first cavity sidewall near the first cover sidewall, and the first cavity sidewall has a second limiting surface for limiting the first limiting surface. This invention also provides a disconnecting switch, including the aforementioned dustproof structure for an arc-extinguishing chamber. This invention enables a disconnecting switch without a zero-flash arc cover to have a dustproof function while ensuring smooth discharge of arc gas.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and in particular to a dustproof structure for an arc-extinguishing chamber and an isolating switch. Background Technology

[0002] In low-voltage power distribution systems, disconnecting switches are commonly used for opening and closing operations when there is no current or only a very small current in the circuit. Their arc-extinguishing requirements are low, and arc-extinguishing devices are usually not mandatory. However, some disconnecting switches have the capability to interrupt small load currents, and therefore are still equipped with arc-extinguishing chambers. Due to considerations such as reducing switch size, structural complexity, and cost, these disconnecting switches typically do not have a zero-arc shield, so they generally lack dust protection measures. During the breaking process, to ensure effective arc extinguishing, the arc-extinguishing chamber's casing has vents to allow arc gases to escape. However, in some harsh operating environments, dust and sand can enter the disconnecting switch through these vents. Over time, the accumulation of these impurities inside can reduce the disconnecting switch's performance and service life. Utility Model Content

[0003] The purpose of this invention is to provide a dustproof structure for an arc-extinguishing chamber, which achieves dustproof function without affecting the discharge of arc gas.

[0004] This utility model provides a dustproof structure for an arc-extinguishing chamber, including an arc-extinguishing chamber, a base, and a dustproof cover. The arc-extinguishing chamber includes a cover set on its top, and the top of the cover has a mounting groove with multiple air vents communicating with the interior of the arc-extinguishing chamber. One side of the mounting groove is connected to the first side wall of the cover via a rotating groove. The dustproof cover includes a plate and a rotating shaft connected by a connector. The rotating shaft is rotatably disposed in the rotating groove. The plate can be embedded in the mounting groove and block the multiple air vents. The connector also has a first limiting surface. The base has a cavity for accommodating the arc-extinguishing chamber. The cavity includes a first cavity sidewall near the first cover sidewall. The first cavity sidewall has a second limiting surface for limiting the first limiting surface. The second limiting surface limits the maximum rotation angle of the plate, ensuring that the plate can fall back into the mounting groove under its own weight.

[0005] Preferably, the first cover sidewall is provided with a first limiting groove, and the first cavity sidewall is provided with a first limiting boss that is inserted and cooperates with the first limiting groove.

[0006] Preferably, one side of the mounting groove is connected to the first limiting groove through the rotating groove, and the second limiting surface is disposed on the first limiting protrusion.

[0007] Preferably, the second limiting surface is disposed on the top of the sidewall of the first cavity.

[0008] Preferably, the first limiting surface is set at an angle to the top surface of the plate.

[0009] Preferably, the rotation angle of the plate is 0°-68°.

[0010] Preferably, the second limiting surface is vertically arranged.

[0011] Preferably, the bottom of the connector is also provided with a clearance groove.

[0012] Preferably, the rotating shaft is detachably disposed in the rotating groove.

[0013] This utility model also provides an isolating switch, including the aforementioned arc-extinguishing chamber dustproof structure.

[0014] The advantage of this invention lies in the fact that, through the limiting cooperation between the first limiting surface on the dust cover and the side wall of the first cavity on the base, the isolating switch without a zero-flashover shield can have a dustproof function while ensuring the smooth discharge of arc gas. When the arc gas is discharged, the dust cover will rotate under the push of the arc gas, causing the vent to open; after the arc gas is discharged, the dust cover will fall back to its original position under its own gravity and seal the vent, preventing external impurities from entering the arc-extinguishing chamber through the vent.

[0015] This invention ensures the normal operation of the disconnecting switch and extends its service life. Attached Figure Description

[0016] Figure 1 This is a perspective view of the dustproof structure of the arc-extinguishing chamber of this utility model;

[0017] Figure 2 It is a three-dimensional diagram of the arc-extinguishing chamber;

[0018] Figure 3 It is a 3D view of the casing;

[0019] Figure 4 It is a 3D view of the dust cover;

[0020] Figure 5 This is a schematic diagram of the installation structure of the dust cover and the housing;

[0021] Figure 6 It is a three-dimensional view of the base;

[0022] Figure 7 and Figure 8 These are schematic diagrams of the installation structure of the dust cover with its base and cover when it is opened, viewed from different angles.

[0023] Figure 9 This is a perspective view of the isolating switch of the present invention when the dust cover is open;

[0024] Figure 10 This is a perspective view of the isolating switch of the present invention when the dust cover is closed.

[0025] In the picture:

[0026] 1. Arc-extinguishing chamber; 11. Cover; 111. Mounting groove; 112. Vent hole; 113. Rotation groove; 114. First limiting groove; 115. Second limiting groove; 116. First cover sidewall; 117. Second cover sidewall;

[0027] 2. Base; 21. Cavity; 211. First cavity sidewall; 212. Second cavity sidewall; 221. First limiting boss; 2211. Second limiting surface; 222. Second limiting boss;

[0028] 3. Dust cover; 31. Rotating shaft; 32. Connecting piece; 321. First limiting surface; 322. Clearance groove; 33. Plate body. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0030] In the description of this utility model, it should be noted that the terms "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0032] like Figure 1 As shown, this utility model provides a dustproof structure for an arc-extinguishing chamber, which includes an arc-extinguishing chamber 1, a base 2, and a dustproof cover 3.

[0033] like Figure 1-3As shown, the arc-extinguishing chamber 1 includes a cover 11 disposed on its top. The top of the cover 11 is provided with a mounting groove 111. The mounting groove 111 is provided with a plurality of air outlets 112 that communicate with the interior of the arc-extinguishing chamber 1. One side of the mounting groove 111 is connected to the first cover side wall 116 of the cover 11 through a rotating groove 113.

[0034] like Figure 3-5 As shown, the dust cover 3 includes a plate 33 and a rotating shaft 31 connected by a connector 32. The rotating shaft 31 is rotatably disposed in the rotating groove 113. The plate 33 can be embedded in the mounting groove 111 and block multiple air vents 112. The connector 32 is also provided with a first limiting surface 321.

[0035] like Figure 6-8 As shown, the base 2 is provided with a cavity 21 for accommodating the arc-extinguishing chamber 1, that is, the arc-extinguishing chamber 1 is installed in the cavity 21. The cavity 21 includes a first cavity sidewall 211 near the first cover sidewall 116, and a second limiting surface 2211 is provided on the first cavity sidewall 211 for limiting the first limiting surface 321. The second limiting surface 2211 limits the maximum rotation angle of the plate 33, ensuring that the plate 33 can fall back into the mounting groove 111 under its own gravity.

[0036] like Figure 9-10 As shown, this utility model also provides an isolating switch including the aforementioned arc-extinguishing chamber dustproof structure.

[0037] Combination Figure 1-10 The working principle of this utility model is as follows: When the disconnecting switch is in the open or closed state, the rotation angle of the plate 33 is 0°. It is embedded in the mounting groove 111 and blocks multiple vent holes 112, which can prevent external impurities from entering the arc-extinguishing chamber 1 through the vent holes 112. When the disconnecting switch is in the disconnection process, the generated arc gas will be discharged through the vent holes 112. During this process, the arc gas pushes the plate 33 to rotate around the rotating shaft 31 and disengage from the mounting groove 111, and the vent holes 112 open. When the plate 33 rotates around the rotating shaft 31 by a certain angle, the first limiting surface 321 abuts against the second limiting surface 2211. The second limiting surface 2211 can effectively prevent the plate 33 from failing to fall back automatically due to excessive rotation angle. After the arc gas is discharged, the plate 33 will fall back into the mounting groove 111 under its own gravity, and the vent holes 112 will close again.

[0038] As can be seen from the above, by setting the aforementioned dustproof structure of the arc-extinguishing chamber, this utility model enables the disconnecting switch to have a dustproof function while ensuring the smooth discharge of arc gas, thereby ensuring the normal operation of the disconnecting switch and extending its service life.

[0039] To ensure that the arc gas generated inside the arc extinguishing chamber 1 can smoothly drive the plate 33 to rotate and be discharged from the vent 112, the plate 33 is preferably made of a lightweight material, such as plastic or honeycomb composite material.

[0040] like Figure 3-4 , Figure 7-8 As shown, the rotating shaft 31 is detachably mounted in the rotating groove 113; the first limiting surface 321 is an inclined surface, which is located on the top of the connector 32 and forms an angle with the top surface of the plate 33. A recessed clearance groove 322 is also provided at the bottom of the connector 32. The clearance groove 322 can avoid the connection between the mounting groove 111 and the rotating groove 113, allowing the plate 33 to be stably and reliably embedded in the mounting groove 111 and sealing multiple air vents 112.

[0041] In one specific embodiment of this utility model, each end of the rotating groove 113 is provided with an insertion hole, and both ends of the rotating shaft 31 are respectively inserted into the insertion holes, thereby realizing the detachable connection between the rotating shaft 31 and the rotating groove 113. This structure is easy to process and assemble, and has low production cost. The rotation angle of the plate 33 is 0°-68°, the included angle between the first limiting surface 321 and the top surface of the plate 33 is 22°, and the second limiting surface 2211 is vertically set (i.e., the included angle between the second limiting surface 2211 and the horizontal plane is 90°). When the plate 33 rotates to 68°, the first limiting surface 321 will abut against the second limiting surface 2211, so that the plate 33 cannot continue to increase the rotation angle. To further improve the dustproof effect of the plate 33, a sealing element is also provided along the outer periphery of the plate 33. The sealing element is specifically a rubber strip, which can seal the gap between the plate 33 and the mounting groove 111, thereby enhancing the dustproof effect of the dust cover 3.

[0042] There are various connection methods between the arc-extinguishing chamber 1 and the cavity 21. In one embodiment of this utility model, the arc-extinguishing chamber 1 is installed in the cavity 21 by fasteners such as screws, and the second limiting surface 2211 is disposed on the top of the side wall 211 of the first cavity.

[0043] In another embodiment of this utility model, the arc-extinguishing chamber 1 and the cavity 21 are connected by a limiting structure. For example... Figure 3 , Figure 6-7As shown, the first sidewall 116 of the housing 11 is provided with a first limiting groove 114, and the first sidewall 211 of the cavity 21 is provided with a first limiting boss 221 that engages with the first limiting groove 114. The housing 11 also includes a second sidewall 117 opposite to the first sidewall 116, and the second sidewall 117 is provided with a second limiting groove 115; the cavity 21 also includes a second sidewall 212 opposite to the first sidewall 211, and the second sidewall 212 is provided with a second limiting boss 222 that engages with the second limiting groove 115. The limiting engagement between the limiting groove and the limiting boss can replace additional fasteners, thereby facilitating the installation of the arc-extinguishing chamber 1 in the cavity 21 and restricting the movement of the arc-extinguishing chamber 1. This limiting structure is simple and easy to manufacture and install. In this embodiment, one side of the mounting groove 111 is connected to the first limiting groove 114 through the rotating groove 113, and the second limiting surface 2211 is disposed on the first limiting boss 221.

[0044] Furthermore, such as Figure 5-7 As shown, the base 2 includes two cavities 21 spaced apart on the left and right, and there are two arc-extinguishing chambers 1, with one arc-extinguishing chamber 1 installed in each cavity 21. The cover 11 is detachably mounted on the top of the arc-extinguishing chamber 1. This arrangement facilitates cleaning of the interior of the arc-extinguishing chamber 1 and the air outlet 112, as well as replacement of corresponding parts.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A dustproof structure of an arc extinguishing chamber, characterized by comprising: It includes an arc-extinguishing chamber (1), a base (2), and a dust cover (3). The arc-extinguishing chamber (1) includes a cover (11) set on its top. The top of the cover (11) is provided with a mounting groove (111). The mounting groove (111) is provided with a plurality of air outlets (112) that communicate with the interior of the arc-extinguishing chamber (1). One side of the mounting groove (111) is connected to the first cover sidewall (116) of the cover (11) through a rotating groove (113). The dust cover (3) includes a plate (33) and a rotating shaft (31) connected by a connector (32). The rotating shaft (31) is rotatably disposed in the rotating groove (113). The plate (33) can be embedded in the mounting groove (111) and block the plurality of air vents (112). The connector (32) is also provided with a first limiting surface (321). The base (2) is provided with a cavity (21) for accommodating the arc-extinguishing chamber (1). The cavity (21) includes a first cavity sidewall (211) near the first cover sidewall (116). The first cavity sidewall (211) is provided with a second limiting surface (2211) for limiting the first limiting surface (321). The second limiting surface (2211) limits the maximum rotation angle of the plate (33) to ensure that the plate (4) can fall back into the mounting groove (111) under its own gravity.

2. The dust-proof structure of the arc extinguishing chamber according to claim 1, characterized in that, The first cover sidewall (116) is provided with a first limiting groove (114), and the first cavity sidewall (211) is provided with a first limiting boss (221) that is inserted and cooperates with the first limiting groove (114).

3. The dust-proof structure of the arc extinguishing chamber according to claim 2, characterized in that, One side of the mounting groove (111) is connected to the first limiting groove (114) through the rotating groove (113), and the second limiting surface (2211) is disposed on the first limiting boss (221).

4. The dust-proof structure of the arc extinguishing chamber according to claim 1, characterized in that, The second limiting surface (2211) is disposed on the top of the first cavity sidewall (211).

5. The dust-proof structure of the arc extinguishing chamber according to claim 1, characterized in that, The first limiting surface (321) is set at an angle to the top surface of the plate (33).

6. The dust-proof structure of the arc extinguishing chamber according to claim 5, characterized in that The rotation angle of the plate (33) is 0°-68°.

7. The dust-proof structure of the arc extinguishing chamber according to claim 5, characterized in that The second limiting surface (2211) is set vertically.

8. The dust-proof structure of the arc extinguishing chamber according to claim 1, characterized in that, The bottom of the connector (32) is also provided with a clearance groove (322).

9. The dust-proof structure of the arc extinguishing chamber according to claim 1, characterized in that, The rotating shaft (31) is detachably disposed in the rotating groove (113).

10. A disconnector, characterized in that Includes the dustproof structure of the arc-extinguishing chamber as described in any one of claims 1-9.

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