Arc extinguishing structure and rotary disconnecting switch

Abstract

The utility model discloses an arc extinguishing structure and a rotary disconnecting switch, and relates to the field of low-voltage electrical appliances, the arc extinguishing structure comprises an arc extinguishing grid sheet group, the arc extinguishing grid sheet group comprises two insulating side plates, the two insulating side plates clamp a plurality of metal arc extinguishing grid sheets which are arranged in a laminated manner, and the metal arc extinguishing grid sheets are provided with first gaps; the metal arc-extinguishing grid sheets form two grid sheet legs at the two sides of the first gap, the arc-extinguishing grid sheet group also comprises at least one insulating spacer, and the insulating spacer at least shields a gap between the tail parts, far away from the first gap, of the two adjacent metal arc-extinguishing grid sheets. The arc extinguishing device is used for electrically isolating at least two adjacent metal arc extinguishing grid sheets, and preventing arc extinguishing failure caused by arc segmentation failure of the metal arc extinguishing grid sheets due to the fact that an arc rushes to the back of the whole arc extinguishing grid sheet group through a gap between the metal arc extinguishing grid sheets and is connected again to form an arc when the rotary isolating switch breaks a large current. According to the invention, the breaking capacity of the rotary disconnecting switch can be improved.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an arc-extinguishing structure and a rotary disconnecting switch. Background Technology

[0002] Rotary disconnect switches serve to isolate power supplies and break circuits. With the rapid development of the photovoltaic industry, rotary disconnect switches have also been widely used. In recent years, increasingly higher requirements have been placed on the current-carrying capacity and temperature rise performance of rotary disconnect switches.

[0003] The rotary disconnector has an arc-extinguishing chamber inside, in which multiple metal arc-extinguishing grids are stacked to extinguish the electric arc generated when the moving and stationary contacts come into contact or break. When the rotary disconnector interrupts a large current, the electric arc can easily pass through the gaps between the metal arc-extinguishing grids and rush to the back of the entire arc-extinguishing chamber to reconnect and form a long arc, causing the metal arc-extinguishing grids to fail to divide the arc, thus resulting in arc-extinguishing failure. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an arc-extinguishing structure and rotary isolating switch with stronger breaking capacity.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this application provides an arc-extinguishing structure, including an arc-extinguishing grid assembly, the arc-extinguishing grid assembly including two insulating side plates, a plurality of metal arc-extinguishing grids sandwiched between the two insulating side plates, the metal arc-extinguishing grids having a first notch, and the metal arc-extinguishing grids forming two grid legs on both sides of the first notch, characterized in that it includes at least one insulating spacer, the insulating spacer at least blocking the gap between the tails of two adjacent metal arc-extinguishing grids away from the first notch.

[0007] In one possible implementation, the insulating spacer is fixedly mounted between two insulating side plates.

[0008] In one possible implementation, the arc-extinguishing grid assembly is disposed within the switching unit, and the insulating spacer is integrally formed with the housing of the switching unit.

[0009] In one possible implementation, the side of the insulating spacer is abutted against the tail of at least two adjacent metal arc-quenching grids.

[0010] In one possible implementation, the insulating spacer extends between two adjacent metal arc-quenching grids.

[0011] In one possible implementation, the insulating spacer includes an open groove and two spacer legs located on both sides of the groove, and an insulating plate integrally formed with the two spacer legs, the insulating plate being located between adjacent metal arc-extinguishing grids, the groove corresponding to the position of a first notch in the metal arc-extinguishing grid;

[0012] Alternatively, the insulating spacer may include an insulating plate located between adjacent metal arc-quenching grids.

[0013] In one possible implementation, two protrusions extend from the upper and lower sides of the insulating spacer, forming a slot between the two protrusions. The insulating side plate includes an outer arc side and an inner arc side. A locking hole is provided on the insulating side plate. The locking hole is close to the outer arc side and forms a locking platform with the outer arc side. One of the protrusions extends into the locking hole, and the locking platform is locked in the slot.

[0014] In one possible implementation, the arc-extinguishing grid assembly includes two insulating spacers that are evenly distributed among multiple metal arc-extinguishing grids, dividing the multiple metal arc-extinguishing grids into three groups.

[0015] In one possible implementation, the arc-extinguishing grid assembly includes two insulating spacers, which are evenly spaced apart and arranged on one side of the tail of the metal arc-extinguishing grid in the arc-extinguishing grid assembly.

[0016] In one possible implementation, each insulating spacer blocks the gap between the tails of two metal arc-extinguishing grid plates.

[0017] In one possible implementation, the arc-extinguishing grids are arranged in an arc shape, and a plurality of the metal arc-extinguishing grids and the insulating spacers are radially mounted on two insulating side plates, with an included angle between adjacent metal arc-extinguishing grids.

[0018] In one possible implementation, the first notch includes a first arc-extinguishing groove at the entrance and a second arc-extinguishing groove at the bottom, the first and second arc-extinguishing grooves being connected. The first arc-extinguishing groove has a "V" shape, and the second arc-extinguishing groove has a "U" shape and is inclined. The width at the entrance of the first notch is greater than the width at the bottom of the first notch, including a first side and a second side opposite to each other. The first side protrudes toward the second side, forming a triangular tip structure. There is a gap between the tip structure and the second side. The tip structure divides the first notch into a "U" shaped area at the bottom and a "V" shaped area at the entrance. The "U" shaped area and the "V" shaped area respectively form the second arc-extinguishing groove and the first arc-extinguishing groove. Adjacent metal arc-extinguishing grids are arranged alternately, so that the inclination direction of the second arc-extinguishing groove of the first notch of adjacent metal arc-extinguishing grids is opposite, and the protrusion direction of the tip structure is opposite.

[0019] Secondly, this application provides a rotary disconnect switch, including a switch unit, wherein the switch unit is provided with a stationary contact, the arc extinguishing structure, and a rotary contact assembly rotatably disposed therein. The rotary contact assembly includes a moving contact, and the rotary contact assembly rotates to make the moving contact contact or disconnect from the stationary contact. The arc extinguishing structure includes two arc extinguishing grid groups disposed opposite to each other, the two arc extinguishing grid groups are located on both sides of the rotary contact assembly, and the ends of the two arc extinguishing grid groups are respectively disposed at a distance from each other. The two stationary contacts are respectively located within the interval between the ends of the two arc extinguishing grid groups.

[0020] Compared to existing technologies, the arc-extinguishing structure provided in this application includes an arc-extinguishing grid assembly. The arc-extinguishing grid assembly includes two insulating side plates that hold multiple stacked metal arc-extinguishing grids. Each metal arc-extinguishing grid has a first notch, and two grid legs are formed on both sides of the first notch. The arc-extinguishing grid assembly also includes at least one insulating spacer. The insulating spacer is used to electrically isolate the gap between the tails of adjacent metal arc-extinguishing grids away from the first notch, preventing the arc from passing through the gap between adjacent metal arc-extinguishing grids and reaching the rear of the entire arc-extinguishing grid assembly when the rotary disconnecting switch interrupts a large current, causing it to reconnect and form a long arc, resulting in the failure of the metal arc-extinguishing grids to divide the arc and ultimately leading to arc-extinguishing failure. This application can improve the breaking capacity of the rotary disconnecting switch.

[0021] Furthermore, the insulating spacer is integrally formed with the housing of the switching unit, reducing the number of parts, facilitating installation, and improving production efficiency.

[0022] In addition, the insulating spacer is fixedly installed between the two insulating side plates, making the connection between the insulating spacer and the insulating side plates tighter and better isolating electric arc.

[0023] In addition, one side of the insulating spacer extends into the gap between two adjacent metal arc-extinguishing grids to electrically isolate the two adjacent metal arc-extinguishing grids, preventing electric arcs from passing through the gap between the metal arc-extinguishing grids and enhancing the electrical isolation effect.

[0024] Furthermore, the arc-extinguishing structure consists of only two insulating spacers, which are evenly spaced on one side of the tail of the metal arc-extinguishing grid in the arc-extinguishing grid assembly. Each insulating spacer blocks only the gap between the tails of the two metal arc-extinguishing grids, which can effectively prevent the arc from reconnecting and growing into a long arc without reducing the arc-extinguishing performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the rotary disconnect switch of this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the switching unit in one embodiment of the present invention;

[0027] Figure 3 This is a top view or a bottom view of the arc-extinguishing grid assembly of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the arc-extinguishing grid assembly in one embodiment of the present invention;

[0029] Figure 5 yes Figure 4 Exploded view of the arc-extinguishing grid assembly;

[0030] Figure 6 This is a schematic diagram of the structure of one embodiment of the insulating spacer of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the metal arc-extinguishing grid sheet of this utility model;

[0032] Figure 8 This is a schematic diagram of the internal structure of the switching unit in one embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram of the structure of an arc-extinguishing grid assembly according to an embodiment of the present invention;

[0034] Figure 10 yes Figure 9 A schematic diagram of the structure of the insulating side plate;

[0035] Figure 11a and Figure 11b yes Figure 8 A schematic diagram of the housing of the intermediate switch unit;

[0036] Figure 12a and Figure 12b This is a schematic diagram of the internal structure of the switching unit in one embodiment of the present invention;

[0037] The reference numerals in the attached drawings include: operating device 105; switching unit 100; rotating contact assembly 1; stationary contact 2; arc-extinguishing grid assembly 3; insulating side plate 31; metal arc-extinguishing grid 32; first notch 321; insulating spacer 33; second notch 311; groove 34; spacer leg 35; insulating plate 36; slot 37; slot hole 38; first arc-extinguishing groove 323; second arc-extinguishing groove 324; tip structure 322; first switching unit 101; second switching unit 102. Detailed Implementation

[0038] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0039] like Figures 1-2As shown, the rotary disconnect switch includes a stacked operating device 105 and a switching unit 100. The operating device 105 includes an operating mechanism connected to the switching unit 100, used to drive the switching unit 100 to open or close, connecting or disconnecting the circuit. The switching unit 100 includes a housing and a rotary contact assembly 1, a stationary contact 2, and an arc-extinguishing structure disposed inside the housing. The rotary contact assembly 1 includes a moving contact. The operating mechanism is connected to the rotary contact assembly 1 and can drive the rotary contact assembly 1 to rotate inside the switching unit 100, thereby driving the moving contact to contact or separate from the stationary contact 2, completing the connection or disconnection of the circuit. It has the advantages of compact design and simple operation. The arc-extinguishing structure is used to extinguish the electric arc generated at the moment the moving contact and stationary contact 2 contact or disconnect.

[0040] The operating device 105 also includes a trip unit, which is connected to the operating mechanism and the control system respectively. The control system is connected to the circuit network corresponding to the trip unit. When the circuit network fails, the control system drives the trip unit to trip the operating mechanism. The operating mechanism drives the moving contact of the switch unit 100 to separate from the stationary contact 2, thereby improving the safety protection performance of the disconnecting switch.

[0041] like Figure 2 As shown in the preferred embodiment of this application, the switch unit 100 is provided with two stationary contacts 2 at intervals inside. One stationary contact 2 is connected to the inlet end of the line, and the other stationary contact 2 is connected to the outlet end of the line. The rotating contact assembly 1 rotates and simultaneously contacts or disconnects from the two stationary contacts 2 to control the conduction or disconnection of the circuit.

[0042] like Figures 1-12b This application provides an arc-extinguishing structure for a rotary disconnector. In the embodiments provided by this utility model, the arc-extinguishing structure is preferably applied to a rotary disconnector, but it is not limited to rotary disconnectors. Any device that can utilize the arc-extinguishing structure of this application is within the protection scope of this application. In the embodiments of this application, the arc-extinguishing structure includes two relatively spaced arc-extinguishing grid plate groups 3 located on both sides of the rotary contact assembly 1.

[0043] in, Figure 2 This is a schematic diagram of the internal structure of the switch unit 100. Figure 3 It is a top view or a bottom view of the arc-extinguishing grid assembly 3. Figure 4 A schematic diagram of the structure of arc-extinguishing grid assembly 3. Figure 5 This is an exploded view of arc-extinguishing grid assembly 3.

[0044] Preferred, such as Figures 3-5As shown, the arc-extinguishing grid assembly 3 includes two insulating side plates 31 and multiple stacked metal arc-extinguishing grids 32. The two insulating side plates 31 clamp the multiple metal arc-extinguishing grids 32. Each metal arc-extinguishing grid 32 is provided with a first notch 321, and two grid legs are formed on both sides of the first notch 321. The first notch 321 is used for arc extinguishing, which is the prior art in this field. Preferably, adjacent metal arc-extinguishing grids 32 are arranged in an alternating pattern, so that the bottom inclination direction of the first notch 321 of adjacent metal arc-extinguishing grids 32 is opposite; that is, one metal arc-extinguishing grid 32 is installed facing forward, and another metal arc-extinguishing grid 32 is rotated 180 degrees and installed in the opposite direction, so that the inclination direction of the first notch 321 in adjacent metal arc-extinguishing grids 32 is opposite. The staggered arrangement of the bottom slopes of adjacent metal arc-extinguishing grids 32 will form an inwardly concave chamfer in the middle of the two arc-extinguishing grid assemblies 3. The formed chamfer is more conducive to lengthening the arc to achieve a better arc extinguishing effect.

[0045] Furthermore, in a preferred embodiment of this application, the arc-extinguishing grid assembly 3 is provided with only two insulating side plates 31, and a rear side plate is not provided behind the air outlet, which makes assembly simple and cost-effective.

[0046] like Figures 3-12b As shown, the arc-extinguishing structure of this application also includes at least one insulating spacer. The insulating spacer at least blocks the gap between the tails of two adjacent metal arc-extinguishing grid plates 32 away from the first notch 321, which is used to electrically isolate the gap between adjacent metal arc-extinguishing grid plates 32. This prevents the arc from rushing out of the gap between adjacent metal arc-extinguishing grid plates 32 when the rotary disconnecting switch breaks a large current, and from rushing from the front of the entire arc-extinguishing grid plate group 3 to the rear of the entire arc-extinguishing grid plate group 3 to reconnect and form a long arc, causing the metal arc-extinguishing grid plates 32 to fail to divide the arc, and ultimately leading to arc-extinguishing failure. This application can improve the breaking capacity of the rotary disconnecting switch.

[0047] In one embodiment, such as Figures 3-7 As shown, the insulating spacer 33 is fixedly installed between the two insulating side plates 31, making the connection between the insulating spacer 33 and the insulating side plates 31 tighter and better isolating the electric arc.

[0048] Preferred, such as Figure 3 As shown, one side of the insulating spacer 33 extends into the gap between two adjacent metal arc-extinguishing grid plates 32 to electrically isolate the two adjacent metal arc-extinguishing grid plates 32.

[0049] Preferably, the arc-extinguishing grid plate group 3 includes two insulating spacers 33, which are evenly distributed among multiple metal arc-extinguishing grid plates 32, roughly dividing the multiple metal arc-extinguishing grid plates 32 into three groups. Each insulating spacer 33 blocks the gap between the tails of two adjacent metal arc-extinguishing grid plates 32 away from the first notch 321, which can effectively prevent the arc from reconnecting and growing into a long arc without reducing the arc-extinguishing performance.

[0050] Of course, in a less desirable embodiment, the arc-extinguishing grid assembly 3 includes one, three, or more insulating spacers 33. However, one insulating spacer 33 may cause the arc to reconnect and grow into a longer arc, while three insulating spacers evenly distributed among the multiple metal arc-extinguishing grids 32, dividing the multiple metal arc-extinguishing grids 32 into four groups, may hinder the venting of the arc-extinguishing structure and reduce the arc-extinguishing performance. Therefore, the number of insulating spacers 33 needs to be reasonably arranged according to the size of the arc-extinguishing grid assembly 3 and the number of metal arc-extinguishing grids 32 inside the arc-extinguishing grid assembly 3, to ensure that the arc-extinguishing structure can vent properly and prevent the arc from reconnecting and growing into a longer arc, without reducing the arc-extinguishing performance.

[0051] Furthermore, such as Figures 3-6 As shown, the insulating spacer 33 includes an open groove 34 and two spacer legs 35 located on both sides of the groove 34, as well as an insulating plate 36 integrally formed with the two spacer legs 35. The insulating plate 36 and the two spacer legs 35 surround to form the groove 34. The insulating plate 36 is located between adjacent metal arc-extinguishing grid plates 32 and plays an insulating role. The groove 34 corresponds to the position of the first notch 321 of the metal arc-extinguishing grid plate 32. Alternatively, the insulating spacer 33 includes an insulating plate 36, which is located between adjacent metal arc-extinguishing grid plates 32, that is, the two spacer legs 35 are not provided. The upper and lower sides of the insulating spacer 33 are fixedly installed on the insulating side plates 31 on both sides.

[0052] Furthermore, the insulating spacer 33 has two protrusions extending from its upper and lower sides respectively, that is, two protrusions are provided on each side of the spacer leg 35, and a groove 37 is formed between the two protrusions. The insulating side plate 31 has a locking hole 38 corresponding to one of the protrusions. The insulating side plate 31 has an arc-shaped structure including an outer arc side and an inner arc side. The locking hole 38 is located near the outer arc side, and the locking hole 38 and the outer arc side form a locking platform. The protrusion extends into the locking hole 38, and the locking platform is engaged in the groove 37. Figure 6 A schematic diagram of the insulating spacer 33 is shown.

[0053] Furthermore, such as Figure 4 and Figure 5As shown, the insulating side plate 31 includes an outer arc sidewall and an inner arc sidewall. The locking holes 38 are respectively provided at one-third position and two-thirds position of the outer arc sidewall, and the insulating spacer 33 is installed on the locking holes 38.

[0054] In one embodiment, such as Figures 8-11b As shown, the arc-extinguishing grid plate group 3 is disposed within the switch unit 100. The insulating spacer 33 is integrally formed with the housing of the switch unit 100, and the insulating spacer 33 extends between two adjacent metal arc-extinguishing grid plates 32. The integral formation of the insulating spacer 33 with the housing of the switch unit 100 reduces the number of parts, facilitates installation, and improves production efficiency.

[0055] Furthermore, in the preferred embodiment of this application, the switch unit 100 has two integrally formed insulating spacers 33 within its housing. The two insulating spacers 33 are evenly spaced, dividing the plurality of metal arc-extinguishing grids 32 into approximately three groups. Each insulating spacer 33 extends only between the tail gaps of two metal arc-extinguishing grids 32 in one group. This effectively prevents the arc from reconnecting and growing into a long arc without reducing the arc-extinguishing performance. Of course, in a less desirable embodiment, the arc-extinguishing grid group 3 may also include one, three, or more insulating spacers 33. However, having only one insulating spacer 33 may cause the arc to reconnect and grow into a long arc, or having three or more insulating spacers 33 may obstruct the venting of the arc-extinguishing structure, resulting in a poorer arc-extinguishing effect.

[0056] In another embodiment, such as Figure 12a and Figure 12b As shown, the arc-extinguishing grid plate group 3 is disposed inside the switch unit 100, the insulating spacer 33 is integrally formed with the housing of the switch unit 100, and one side of the insulating spacer 33 is attached to the tail of at least two adjacent metal arc-extinguishing grid plates 32.

[0057] Furthermore, in a preferred embodiment, the arc-extinguishing grid assembly 3 includes two insulating spacers 33, which are evenly spaced and arranged on one side of the tail of the metal arc-extinguishing grid 32 in the arc-extinguishing grid assembly 3. This effectively prevents the arc from reconnecting and growing into a long arc without reducing the arc-extinguishing performance. Of course, in a less desirable embodiment, it may also include one, three, or more insulating spacers 33. However, with only one insulating spacer 33, the arc may reconnect and grow into a long arc, or with three or more insulating spacers 33, the air venting of the arc-extinguishing structure may be hindered, resulting in a poorer arc-extinguishing effect.

[0058] Furthermore, in a preferred embodiment, each insulating spacer 33 blocks the gap between the tails of two metal arc-extinguishing grid plates 32. Of course, in a less desirable embodiment, each insulating spacer 33 blocks the gap between the tails of three or more metal arc-extinguishing grid plates 32. However, blocking the gap between the tails of three or more metal arc-extinguishing grid plates 32 may hinder the exhaust of the arc-extinguishing structure and reduce the arc-extinguishing performance.

[0059] Preferred, such as Figures 8-12b As shown, the insulating side plate 31 includes an outer arc side and an inner arc side. The second notch 311 is provided at one-third position and two-thirds position of the outer arc side, respectively. The insulating spacer 33 is limited within the second notch 311, which has a fixing effect on the arc extinguishing grid plate group 3.

[0060] Preferred, Figure 7 A schematic diagram of the structure of the metal arc-quenching grid 32 in an embodiment of this application is shown, as follows: Figure 7 As shown, the first notch 321 includes a first arc-extinguishing groove 323 at the entrance and a second arc-extinguishing groove 324 at the bottom. The first arc-extinguishing groove 323 and the second arc-extinguishing groove 324 are connected. The first arc-extinguishing groove 323 has a "V" shaped structure, and the second arc-extinguishing groove 324 has a "U" shaped structure and is inclined. Specifically, the width at the entrance of the first notch 321 is greater than the width at the bottom of the first notch 321, including a first side and a second side. The first side protrudes toward the second side, forming a triangular tip structure 322. There is a gap between the tip structure 322 and the second side. The tip structure 322 divides the first notch 321 into a "U"-shaped area at the bottom and a "V"-shaped area at the entrance. The "U"-shaped area and the "V"-shaped area respectively form the second arc-extinguishing groove 324 and the first arc-extinguishing groove 323. The inclined second side forms one side of the first arc-extinguishing groove 323 and the second arc-extinguishing groove 324. The two sides of the triangular tip structure 322 respectively form the other side of the first arc-extinguishing groove 323 and the second arc-extinguishing groove 324.

[0061] Preferably, the adjacent metal arc-extinguishing grids 32 are arranged alternately, such that the inclination directions of the second arc-extinguishing grooves 324 of the adjacent metal arc-extinguishing grids 32 are opposite, and the protrusion directions of the tip structure 322 are opposite.

[0062] Specifically, the insulating plate 36 of the insulating spacer 33 avoids the first arc-extinguishing groove 323 and the second arc-extinguishing groove 324 to avoid affecting the extinguishing of the electric arc.

[0063] Furthermore, such as Figure 4 and Figure 5As shown, the arc-extinguishing grid group 3 is arranged in an arc shape. Multiple stacked metal arc-extinguishing grids 32 and the insulating spacer 33 are radially mounted on the two insulating side plates 31. There is an angle between adjacent metal arc-extinguishing grids 32, and the angle is acute, that is, adjacent metal arc-extinguishing grids 32 are not parallel. By stacking multiple metal arc-extinguishing grids 32 radially, the movement trajectory of the moving contact can be matched. Because the movement trajectory of the moving contact is arc-shaped during the contact and separation process between the moving contact and the two stationary contacts 2, the arc following the movement trajectory of the moving contact is also approximately arc-shaped. The radial stacking of multiple metal arc-extinguishing grids 32 can reduce the resistance of the arc movement and make it easier for the arc to enter the two arc-extinguishing grid groups 3, thus achieving a better arc extinguishing effect.

[0064] Preferred, such as Figure 1 As shown, the rotary disconnect switch includes a first switch unit 101 and a second switch unit 102 stacked together. The current carrying capacity of the second switch unit 102 is weaker than that of the first switch unit 101. The thickness of the second switch unit 102 is less than that of the first switch unit 101. The thickness of the arc-extinguishing grid group 3 of the second switch unit 102 is less than that of the arc-extinguishing grid group 3 of the first switch unit 101. The thickness of the moving contact and stationary contact 2 of the second switch unit 102 is less than that of the moving contact and stationary contact 2 of the first switch unit 101. Further, as... Figure 1 As shown in the preferred embodiment of this application, the rotary disconnect switch includes a plurality of first switch units 101 stacked together and a plurality of second switch units 102 stacked together. The plurality of first switch units 101 and the plurality of second switch units 102 are used to connect and control the on / off state of multiple lines, and enable the rotary disconnect switch to have different current carrying capacities, thus having a wider range of application scenarios.

[0065] Preferably, the switching unit 100 is provided with a first upper partition and a first lower partition, and the rotating contact assembly 1 and the two arc-extinguishing grid groups 3 are disposed between the first upper partition and the first lower partition. The first upper partition and the first lower partition can clamp and fix the rotating contact assembly 1 and the two arc-extinguishing grid groups 3 along the thickness direction of the switching unit 100 to form an integral arc-extinguishing space, thereby improving the arc-extinguishing performance and enabling arc extinguishing with higher current carrying capacity.

[0066] Furthermore, the first upper partition and the first lower partition are made of insulating gas-generating material. When the moving contact and the two stationary contacts 2 come into contact or separate, an electric arc is generated. The gas generated by the first upper partition and the first lower partition under the high temperature erosion of the electric arc can cool the arc. Simultaneously, the generated gas also propels the arc towards the arc-extinguishing chamber, thereby accelerating arc extinguishing.

[0067] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0068] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An arc-extinguishing structure comprising an arc-extinguishing grid assembly (3), the arc-extinguishing grid assembly (3) comprising two insulating side plates (31), a plurality of metal arc-extinguishing grids (32) sandwiched between the two insulating side plates (31), the metal arc-extinguishing grids (32) having a first notch (321), and the metal arc-extinguishing grids (32) forming two grid legs on both sides of the first notch (321), characterized in that, It includes at least one insulating spacer (33) that at least blocks the gap between the tails of two adjacent metal arc-quenching grids (32) away from the first notch (321).

2. The arc-extinguishing structure according to claim 1, characterized in that, The insulating spacer (33) is fixedly installed between the two insulating side plates (31).

3. The arc-extinguishing structure according to claim 1, characterized in that, The arc-extinguishing grid assembly (3) is disposed inside the switch unit (100), and the insulating spacer (33) is integrally formed with the housing of the switch unit (100).

4. The arc-extinguishing structure according to claim 2 or 3, characterized in that, The side of the insulating spacer (33) is attached to the tail of at least two adjacent metal arc-extinguishing grid plates (32).

5. The arc-extinguishing structure according to claim 2 or 3, characterized in that, The insulating spacer (33) extends between two adjacent metal arc-quenching grids (32).

6. The arc-extinguishing structure according to claim 5, characterized in that, The insulating spacer (33) includes an open groove (34) and two spacer legs (35) located on both sides of the groove (34), and an insulating plate (36) integrally formed with the two spacer legs (35). The insulating plate (36) is located between adjacent metal arc-extinguishing grid plates (32), and the groove (34) corresponds to the position of the first notch (321) of the metal arc-extinguishing grid plate (32). Alternatively, the insulating spacer (33) may include an insulating plate (36) located between adjacent metal arc-quenching grid plates (32).

7. The arc-extinguishing structure according to claim 6, characterized in that, The insulating spacer (33) has two protrusions extending from its upper and lower sides respectively, and a slot (37) is formed between the two protrusions. The insulating side plate (31) includes an outer arc side and an inner arc side. A slot (38) is provided on the insulating side plate (31). The slot (38) is close to the outer arc side and forms a slot with the outer arc side. One of the protrusions extends into the slot (38), and the slot is locked in the slot (37).

8. The arc-extinguishing structure according to claim 5, characterized in that, The arc-extinguishing grid plate group (3) includes two insulating spacers (33), which are evenly distributed among multiple metal arc-extinguishing grid plates (32), dividing the multiple metal arc-extinguishing grid plates (32) into three groups.

9. The arc-extinguishing structure according to claim 4, characterized in that, The arc-extinguishing grid plate group (3) includes two insulating spacers (33), which are evenly spaced on one side of the tail of the metal arc-extinguishing grid plate (32) of the arc-extinguishing grid plate group (3).

10. The arc-extinguishing structure according to claim 2 or 3, characterized in that, Each insulating spacer (33) blocks the gap between the tails of the two metal arc-extinguishing grid plates (32).

11. The arc-extinguishing structure according to claim 2, characterized in that, The arc-extinguishing grids are arranged in an arc shape, and multiple metal arc-extinguishing grids (32) and insulating spacers (33) are radially mounted on two insulating side plates (31), with an included angle between adjacent metal arc-extinguishing grids (32).

12. The arc-extinguishing structure according to claim 1, characterized in that, The first notch (321) includes a first arc-extinguishing groove (323) at the entrance and a second arc-extinguishing groove (324) at the bottom. The first arc-extinguishing groove (323) and the second arc-extinguishing groove (324) are connected. The first arc-extinguishing groove (323) has a "V" shaped structure, and the second arc-extinguishing groove (324) has a "U" shaped structure and is inclined. The width at the entrance of the first notch (321) is greater than the width at the bottom of the first notch (321), including a first side and a second side opposite to each other. The first side protrudes toward the second side, forming a triangular tip structure (322). The tip structure (322) has a gap with the second side. The tip structure (322) divides the first notch (321) into a "U"-shaped area at the bottom and a "V"-shaped area at the entrance. The "U"-shaped area and the "V"-shaped area form the second arc-extinguishing groove (324) and the first arc-extinguishing groove (323) respectively. The adjacent metal arc-extinguishing grids (32) are arranged alternately, so that the second arc-extinguishing grooves (324) of the first notch (321) of the adjacent metal arc-extinguishing grids (32) are tilted in opposite directions, and the protrusions of the tip structure (322) are in opposite directions.

13. A rotary disconnect switch, comprising a switching unit (100), characterized in that, The switching unit (100) is provided with a stationary contact (2), an arc-extinguishing structure as described in any one of claims 1-12, and a rotating contact assembly (1) rotatably provided. The rotating contact assembly (1) includes a moving contact. The rotating contact assembly (1) rotates to make the moving contact contact or disconnect from the stationary contact (2). The arc-extinguishing structure includes two arc-extinguishing grid groups (3) arranged opposite to each other. The two arc-extinguishing grid groups (3) are located on both sides of the rotating contact assembly (1), and the ends of the two arc-extinguishing grid groups (3) are respectively arranged at intervals relative to each other. The two stationary contacts (2) are respectively located within the interval between the ends of the two arc-extinguishing grid groups (3).

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