Arc extinguishing device of switch

Abstract

An arc extinguishing device of a switch belongs to the technical field of switching devices. Comprising a pair of side walls which are matched with each other in a face-to-face mode and grid pieces arranged between the pair of side walls in an array mode, the pair of side walls are tightened through fasteners, at least one fastener is sleeved with an insulating sleeve, the insulating sleeve abuts against a splicing seam of the pair of side walls, and the grid pieces are connected with the insulating sleeve. The device is used for preventing electric arc gas from escaping from a splicing gap of a pair of side walls to break down the fastener. The connector has the advantages that the insulating sleeve is sleeved on the fastener which is tightened after the pair of side walls are matched with each other, and the insulating sleeve is propped against the splicing gap of the pair of side walls, so that the pair of side walls can be reliably tightened; and the occurrence of a breakdown condition generated when the electric arc escaped from the abutted seam of the pair of side walls encounters the fastener can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of switch apparatus, specifically relates to an arc extinguishing device of switch. BACKGROUND

[0002] Switch, especially disconnecting switch, is an important low-voltage electrical apparatus, and its function is to control the on-off of the current to meet the on-off management of the power supply network.

[0003] With the development of new energy such as wind power and photovoltaic power generation facilities, the application scenarios of these power generation facilities connected to the power grid are increasing, and accordingly, the application of frame type circuit breaker is also increasing. Since the arc extinguishing device is an indispensable important arc extinguishing component of the switch, the industry has increasingly strict requirements for it. Specifically, when the contact system of the switch breaks the current, an arc will be generated, which needs to enter the arc extinguishing device to be extinguished. Only after the arc is extinguished by the arc extinguishing device, the on-off of the current is disconnected.

[0004] The arc extinguishing device of the switch usually includes a shell, arc extinguishing grid plates (stacked or arranged in a specific shape) arranged in the shell, and an arc guide plate for guiding the arc into the arc extinguishing grid plates for arc extinguishing. The aforementioned shell includes a pair of side walls facing each other, which usually needs to be tightened by fasteners such as fastening bolts between the pair of side walls, and the assembly is completed after tightening. The positive significance of the aforementioned tightening of the pair of side walls by bolts is that the stacked or arranged arc extinguishing grid plates are reliably positioned to prevent them from loosening or shifting due to vibration or impact during operation, ensuring that the arc extinguishing grid plates always maintain the correct arrangement and required spacing, effectively divide and extinguish the arc, improve the overall strength, and use bolts to tighten the pair of side walls to fully ensure the overall structural strength, so that it can withstand greater working load and avoid the influence of external environment, thereby improving the reliability and durability of the switch, etc.

[0005] However, as mentioned above, with the development of new energy, the voltage also increases, and the material of the bolt (also referred to as "screw", the same below) used to tighten the pair of side walls is metal, so that the gap at the joint surface of the pair of side walls after tightening is broken down. Because in a high-voltage or high-current environment, the arc often has very high energy and destructive power, in theory, after the pair of side walls are fully tightened by bolts, the factors of arc leakage and even damage to the equipment can be eliminated, but if the bolt used to tighten the pair of side walls is directly opposite the joint of the side wall, it is difficult to completely prevent the aforementioned breakdown objectively. Therefore, the industry has been working to explore effective technical means to prevent the bolt from being broken down by the arc. SUMMARY

[0006] The utility model discloses a kind of arc extinguishing devices of switch, including the cooperation of a pair of side walls each other face to face and the grid piece arrayed between a pair of side walls, the pair of side walls are tightened by fastener, insulating sleeve is sleeved on at least one described fastener, the insulating sleeve is resisted at the joint seam of a pair of side walls, for preventing arc gas from the joint gap of a pair of side walls and causing breakdown to fastener.

[0007] The utility model discloses a kind of arc extinguishing devices of switch, including the cooperation of a pair of side walls each other face to face and the grid piece arrayed between a pair of side walls, the pair of side walls are tightened by fastener, insulating sleeve is sleeved on at least one described fastener, the insulating sleeve is resisted at the joint seam of a pair of side walls, for preventing arc gas from the joint gap of a pair of side walls and causing breakdown to fastener.

[0008] In a specific embodiment of the utility model, an observation hole is formed on the pair of side walls and at a position corresponding to the insulating sleeve, which extends to the insulating sleeve.

[0009] In another specific embodiment of the utility model, the pair of side walls are a first side wall and a second side wall respectively, the first side wall includes a first wall portion, a first end portion and a second end portion, the first end portion is formed on the right upper portion of the first wall portion, and the second end portion is formed on the left upper portion of the first wall portion, and the first wall portion, the first end portion and the second end portion together form the first side wall, and the side of the first side wall facing the second side wall is open; the second side wall includes a first wall body, a first end wall and a second end wall, the first end wall is formed on the right upper portion of the first wall body, and the second end wall is formed on the left upper portion of the first wall body, and the first wall body, the first end wall and the second end wall together form the second side wall, and the side of the second side wall facing the first side wall is open.

[0010] In yet another specific embodiment of the utility model, the first end portion has a first end portion bolt hole, and the first end wall has a first end wall bolt hole corresponding to the position of the first end portion bolt hole, and when the first and second side walls are matched with each other face to face, the first end wall bolt hole and the first end portion bolt hole form a complete bolt hole for accommodating the fastener and the insulating sleeve sleeved outside the fastener.

[0011] In still another specific embodiment of the utility model, a first observation semicircular hole with a C-shaped cross section is provided on the first end portion and faces the side of the first end wall along the height direction of the arc extinguishing device, and a second observation semicircular hole with a C-shaped cross section and corresponding to the first observation semicircular hole is provided on the first end wall and faces the side of the first end portion along the height direction of the arc extinguishing device, and when the first and second side walls are matched with each other face to face, the first and second observation semicircular holes cooperate to form the observation hole with a circular cross section.

[0012] In still another specific embodiment of the present application, a first matching edge is formed on the first end portion and at a position left of the first observation semi-circular hole, a matching cavity is formed at a lower part of the first matching edge and at a side opposite to the first observation semi-circular hole, a matching edge fitting recess is formed on the first end wall and at a position left of the second observation semi-circular hole, and the first matching edge and the matching edge fitting recess are in a mortise and tenon joint with each other.

[0013] In still another specific embodiment of the present application, the first end portion bolt hole is opposite to the matching cavity, and the first observation semi-circular hole is communicated with the matching cavity.

[0014] In still another specific embodiment of the present application, a wall portion fixing block is formed at a right lower part of the first wall portion, a left end portion positioning boss is formed at a left lower part of the first wall portion, a wall portion supporting plate is formed at a position between the wall portion fixing block and the left end portion positioning boss, a right end portion positioning boss is extended from an upper part of the wall portion fixing block, and the wall portion fixing block, the left and right end portion positioning bosses and the wall portion supporting plate are towards a side of the first wall body; a wall body fixing block is formed at a right lower part of the first wall body, a left head portion positioning boss is formed at a left lower part of the first wall body, a wall body supporting plate is formed at a position between the wall body fixing block and the left head portion positioning boss, and a right head portion positioning boss is extended from an upper part of the wall body fixing block, and the wall body fixing block, the left and right head portion positioning bosses and the wall body supporting plate are towards a side of the first wall portion.

[0015] In still another specific embodiment of the present application, a positioning member for preventing arc gas from invading the grid leg is inserted on the grid leg of the grid.

[0016] In still another specific embodiment of the present application, the arc extinguishing device further comprises a pair of gas generating members, the pair of gas generating members are located at an inner side of the grid, and a space between the pair of gas generating members is formed as an arc channel.

[0017] The technical effect of the technical scheme provided by the present application is that, since the insulating sleeve is sleeved on the fastener which is tightened after the cooperation of the pair of side walls, and the insulating sleeve is arranged at the joint gap of the pair of side walls, the pair of side walls can be reliably tightened, and the occurrence of breakdown of the arc escaping from the joint of the pair of side walls when encountering the fastener can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic view of a switch of the present application;

[0019] Figure 2 FIG. 2 is a schematic view of an arc extinguishing device of the switch of the present application;Figure 1 perspective view of the arc extinguishing device shown in FIG. 1;

[0020] Figure 3 for Figure 1 and Figure 2 perspective exploded view of the arc extinguishing device shown in FIG. 1;

[0021] Figure 4 for Figure 3 schematic view of a first side wall of the pair of side walls shown in FIG. 1, as viewed from the rear side thereof;

[0022] Figure 5 for Figure 3 schematic view of a second side wall of the pair of side walls shown in FIG. 1, as viewed from the rear side thereof, with the grid removed;

[0023] Figure 6 for Figure 3 detailed view of the pair of gas generating members shown in FIG. 1;

[0024] Figure 7 for Figure 3 schematic view of the installation of the insulating sleeve and the fastener shown in FIG. 1. DETAILED DESCRIPTION

[0025] In order to enable a person skilled in the art to more clearly understand the technical substance and beneficial effects of the present application, the applicant will make a detailed description in the following manner by way of examples, but the description of the examples is not a limitation on the technical scheme of the present application, and any equivalent transformation made only in form but not in substance based on the technical concept of the present application should be regarded as falling within the technical scheme of the present application.

[0026] In the following description, any directional or positional concept such as up, down, left, right, front and rear is based on the position state of the present application at the time of description, and thus should not be understood as a special limitation on the technical scheme provided by the present application. Figure 3

[0027] Please refer to Figure 1 , Figure 1 The schematic view of the switch essentially comprises a contact system, which comprises a movable contact 10 and a stationary contact 20. The arc extinguishing device 30 corresponding to the aforementioned contact system is also shown. The aforementioned movable contact 10 and stationary contact 20 are installed inside the housing of the switch. The aforementioned arc extinguishing device 30 is installed at the upper opening of the housing and is located above the aforementioned movable contact 10 and the aforementioned stationary contact 20.

[0028] ​The aforementioned moving contact 10 is typically rotatable, while the aforementioned stationary contact 20 is fixed. After rotation, the moving contact 10 contacts or separates from the stationary contact 20. When they are in contact, the contact system is in a closed state; when they separate, they are in an open state.

[0029] Please see Figures 2-3 ,Depend on Figure 2 The aforementioned arc-extinguishing device 30 includes a pair of sidewalls 1, arrays of grid plates 2 (i.e., "arc-extinguishing grid plates", hereinafter the same) between opposite sides of the pair of sidewalls 1, and a cover 3 located on top of the arc-extinguishing device 30. Figure 3 The image also shows the deionization component 4 and a pair of gas-generating components 5 located above the aforementioned grid plate 2.

[0030] The aforementioned cover 3 is installed above the aforementioned pair of sidewalls 1 joined together. After the aforementioned pair of sidewalls 1 and cover 3 are installed, they form the outer housing of the aforementioned arc-extinguishing device 30. Specifically, the aforementioned pair of sidewalls 1 are a first sidewall 11 and a second sidewall 12. The aforementioned array of grid plates 2 is located between the aforementioned first sidewall 11 and second sidewall 12.

[0031] Depend on Figure 3 As shown, the aforementioned deionization component 4 is disposed within the cavity above the aforementioned grid plate 2, formed by splicing the aforementioned first sidewall 11 and second sidewall 12. Specifically, the aforementioned deionization component 4 includes an insulating plate 41 and a filter component 42. In the height direction of the arc extinguishing device 30, the aforementioned insulating plate 41 is located between the aforementioned filter component 42 and the aforementioned grid plate 2. That is, the aforementioned insulating plate 41 is located above the aforementioned grid plate 2, and the aforementioned filter component 42 is located above the aforementioned insulating plate 41.

[0032] The aforementioned gas-generating components 5 are a pair, which are attached to the inner sides of a pair of grid legs of the aforementioned grid plate 2. The opposing surfaces of the pair of gas-generating components 5 are spaced apart, thereby forming an arc channel. That is to say, the aforementioned arc-extinguishing device 30 also includes a pair of gas-generating components 5, which are in contact with the inner sides of a pair of grid legs of the aforementioned grid plate 2, and the space between the pair of gas-generating components 5 constitutes an arc channel. Since there are many materials known in the industry that can decompose and generate a large amount of gas under the action of high temperature of electric arc to effectively extinguish electric arc, there is no need to be particularly limited in this embodiment.

[0033] The aforementioned arc-extinguishing device 30 also includes a positioning member 6, which is inserted into the grid leg of the aforementioned grid plate 2 to prevent arc gas from attacking the grid leg.

[0034] The aforementioned pair of sidewalls 1, while holding the aforementioned array of grid plates 2, are tightened by fasteners 200. A key technical point of this invention is that at least one of the aforementioned fasteners 200 is fitted with an insulating sleeve 100 to prevent arc gas from escaping from the joint of the pair of sidewalls 1 and causing breakdown of the fastener 200. This insulating sleeve 100 abuts against the joint of the pair of sidewalls 1, thereby preventing gas (arc gas) inside the arc-extinguishing device 30 from contacting the aforementioned fastener 200 through the gap, thus improving the insulation of the arc-extinguishing device. The fastener 200 is preferably a screw or bolt. The following embodiments use a bolt as an example. However, its positioning range is not limited to screws or bolts.

[0035] The aforementioned insulating sleeve 100 can be any one of polyvinyl chloride sleeve, polyurethane sleeve, polypropylene sleeve, silicone rubber sleeve, ceramic sleeve, and glass fiber insulating sleeve. In this embodiment, a silicone rubber sleeve is selected.

[0036] Depend on Figure 3 As shown, in order to confirm the installation status of the aforementioned insulating sleeve 100, an observation hole 300 is formed on one of the aforementioned pair of sidewalls 1 at a position corresponding to the aforementioned insulating sleeve 100. The observation hole 300 extends downward to the insulating sleeve 100. Personnel can observe whether the aforementioned insulating sleeve 100 is installed through this observation hole 300. Furthermore, based on the above description of the observation hole 300, it can be determined without a doubt that the observation hole 300 is a through hole. Preferably, the observation hole 300 is arranged in the vertical direction, that is, along the height direction of the arc-extinguishing device 30.

[0037] Please see Figures 4-5 , Figure 4 The first sidewall 11 of the structural system of a pair of sidewalls 1 shown and Figure 5 The second sidewall 12 shown is preferably made of a thermosetting material, such as DMC or BMC. Glass fiber is usually added to enhance the performance of the first sidewall.

[0038] Please pay attention. Figure 4 The aforementioned first sidewall 11 includes a first wall portion 111, a first end portion 112, and a second end portion 113. The first end portion 112 is located on the upper right side of the first wall portion 111, and the second end portion 113 is located on the upper left side of the first wall portion 111. The first wall portion 111, the first end portion 112, and the second end portion 113 together form the aforementioned first sidewall 11 with one side facing the aforementioned second sidewall 12 being open, while the other three sides form an enclosed [character-shaped structure (the character shape is the shape of half a square bracket in a whole square bracket, the same below, and the same applies to other characters)], that is, forming a three-sided enclosed semi-frame structure. The first end portion 112 corresponds to the aforementioned moving contact 10 side, and the second end portion 113 corresponds to the aforementioned stationary contact 20 side.

[0039] Please see Figure 5 The second side wall 12 comprises a first wall body 121, a first end wall 122 and a second end wall 123. The first end wall 122 is formed on the right upper portion of the first wall body 121, and the second end wall 123 is formed on the left upper portion of the first wall body 121. The first end wall 122 and the second end wall 123 together with the first wall body 121 form an open side toward the first side wall 11, and the other three sides form a semicircular frame structure. The first end wall 122 corresponds to the side of the moving contact 10, and the second end wall 123 corresponds to the side of the stationary contact 20.

[0040] As shown in Figure 4 and Figure 5 , the first end portion 112 has a first end portion bolt hole 1124, and the first end wall 122 has a first end wall bolt hole 1225 corresponding to the position of the first end portion bolt hole 1124. When the first side wall 11 and the second side wall 12 are matched face to face, the first end wall bolt hole 1225 and the first end portion bolt hole 1124 form a complete bolt hole for accommodating the fastener 200 and the insulating sleeve 100 fitted thereon. As described above and in combination with the illustrated structure, the first end portion bolt hole 1124 is used for the insulating sleeve 100 and the fastener 200 inserted into the insulating sleeve 100. Preferably, the first end portion bolt hole 1124 is directly opposite the inside of the matching cavity 1122, and the first end portion bolt hole 1124 is opened along the width direction of the arc extinguishing device 30.

[0041] On the first end portion 112 and toward the side of the first end wall 122 along the height direction of the arc extinguishing device 30, a first observation semicircular hole 1125 with a C-shaped cross section is provided, and on the first end wall 122 and toward the side of the first end portion 112 along the height direction of the arc extinguishing device 30, a second observation semicircular hole 1223 with a C-shaped cross section and corresponding to the first observation semicircular hole 1125 is provided. When the first side wall 11 and the second side wall 12 are matched face to face, the first observation semicircular hole 1125 and the second observation semicircular hole 1223 cooperate to form the observation hole 300 with a circular cross section. The first observation semicircular hole 1125 is in communication with a matching cavity 1122, that is, the first observation semicircular hole 1125 extends or is provided along the height direction of the arc extinguishing device 30.

[0042] The outer side of the aforementioned first end portion 112, i.e. the side opposite to the second end portion 113 (i.e. on the right side of the first end portion 112) and close to, i.e. towards, the second side wall 12 is provided with a first end portion positioning recess 1126 for tenon-and-mortise cooperation or interfitting with the second side wall 12.

[0043] On the aforementioned first end portion 112 and at a position left of the aforementioned first observation semicircular hole 1125 is provided a first cooperation edge 1121, at the lower part of the first cooperation edge 1121 and on the side opposite to the first observation semicircular hole 1125 is provided a cooperation cavity 1122, on the aforementioned first end wall 122 and at a position left of the aforementioned second observation semicircular hole 1223 is provided a cooperation edge insertion recess 1221 corresponding to the aforementioned first cooperation edge 1121, the aforementioned first cooperation edge 1121 and the cooperation edge insertion recess 1221 are tenon-and-mortise cooperated with each other.

[0044] The aforementioned first end portion bolt hole 1124 is opposite to the aforementioned cooperation cavity 1122, and the aforementioned first observation semicircular hole 1125 is communicated with the aforementioned cooperation cavity 1122.

[0045] On the lower right side of the aforementioned first wall portion 111 is provided a wall portion fixing block 1111, on the lower left side is provided an end portion left positioning boss 1112, at a position between the wall portion fixing block 1111 and the end portion left positioning boss 1112 is provided a wall portion support plate 1116, between the wall portion fixing block 1111 and the wall portion support plate 1116 and between the end portion left positioning boss 1112 and the wall portion support plate 1116 are respectively provided wall portion positioning edges 1113, on the upper part of the aforementioned wall portion fixing block 1111 is extended an end portion right positioning boss 1117, and the aforementioned wall portion fixing block 1111, end portion left positioning boss 1112, end portion right positioning boss 1117, wall portion support plate 1116 and wall portion positioning edges 1113 are provided on the side of the lower part of the first wall portion 111 towards the aforementioned first wall body 121. The aforementioned wall portion positioning edges 1113 are cooperated with the louvers 2, i.e. provide positioning function for the louvers 2.

[0046] A wall body fixing block 1211 is formed on the lower right side of the first wall body 121, and a head left positioning boss 1212 is formed on the lower left side. A wall body support plate 1216 is formed between the wall body fixing block 1211 and the head left positioning boss 1212. Wall body positioning rails 1213 are formed at intervals between the wall body fixing block 1211 and the wall body support plate 1216, and between the head left positioning boss 1212 and the wall body support plate 1216. A head right positioning boss 1217 is formed on the upper part of the wall body fixing block 1211. The wall body fixing block 1211, the head left positioning boss 1212, the head right positioning boss 1217, the wall body support plate 1216, and the wall body positioning rails 1213 form the lower side of the first wall body 121, which faces the first side wall 111. When the first side wall 111 and the second side wall 112 are placed face to face, the wall body fixing block 1211 corresponds to the wall body fixing block 1111, the head left positioning boss 1212 corresponds to the head left positioning boss 1112, the wall body support plate 1216 corresponds to the wall body support plate 1116, and the head right positioning boss 1217 corresponds to the head right positioning boss 1117. The grid leg positioning pin shafts 400 are inserted into the grid legs of the grid 2, and are positioned on the front side and the back side of the grid legs. The front end of one of the two grid leg positioning pin shafts 400 is inserted into the recess of the head left positioning boss 1112, and the back end is inserted into the recess of the wall body support plate 1116. The front end of the other of the two grid leg positioning pin shafts 400 is inserted into the recess of the head right positioning boss 1217, and the back end is inserted into the recess of the wall body support plate 1216. Figure 4 The head left positioning boss 1212 corresponds to the head left positioning boss 1112, the head right positioning boss 1217 corresponds to the head right positioning boss 1117, and the wall body support plate 1216 corresponds to the wall body support plate 1116. The grid leg positioning pin shafts 400 are inserted into the grid legs of the grid 2, and are positioned on the front side and the back side of the grid legs. The front end of one of the two grid leg positioning pin shafts 400 is inserted into the recess of the head left positioning boss 1112, and the back end is inserted into the recess of the wall body support plate 1116. The front end of the other of the two grid leg positioning pin shafts 400 is inserted into the recess of the head right positioning boss 1217, and the back end is inserted into the recess of the wall body support plate 1216.

[0047] The positioning member 6 is inserted into the grid legs of the grid 2, and has a shape of [.

[0048] The arc extinguishing device further includes a pair of the gas generating members 5 mentioned above and to be described in detail below. The pair of gas generating members 5 are located on the inner side of the grid 2, and the space between the pair of gas generating members 5 forms an arc passage.

[0049] Please refer to Figure 6 and continue to combine Figure 4 and Figure 5 The grid leg positioning pin shafts 400 are inserted into the gas generating members 5, and the gas generating members 5 are fixed to the pair of side walls 1 by screws. A sealing plate 500 is provided between the mounting surface of the arc extinguishing device 30 and the switch housing. Figure 3The sealing plate 500 is preferably made of a rubber material with elasticity.

[0050] As shown in Figure 4 A wall portion stop 1114 is formed in the middle of the right edge of the first wall portion 111 between the wall portion fixing block 1111 and the left end positioning boss 1112. A wall portion fixing block screw hole 11111 is formed in the wall portion fixing block 1111. A screw passes through the wall portion fixing block screw hole 11111 to fasten the first wall portion 111, the wall body fixing block screw hole 12111 formed in the wall body fixing block 1211, and the pair of gas generating members 4 together.

[0051] The wall portion stop 1114 is in the shape of a convex stop and is located between the first end portion 112 and the wall portion fixing block 1111. The wall portion stop 1114 separates the grid fins 2 from the outside. The wall portion stop 1114 also has an avoidance gap 1115 to avoid the moving arc striking piece inside the arc extinguishing device 30.

[0052] As shown in Figure 4 A first end portion positioning gap 1123 is formed in the lower part of the fitting cavity 1122. The first end portion positioning gap 1123 is also used for mortise and tenon cooperation with the second side wall 12.

[0053] As shown in Figure 4 The inside of the second end portion 113, i.e. the side facing the first end portion 112, has a second fitting stop 1131 for mortise and tenon cooperation with the second side wall 12. The second end portion 113 also has a second end portion bolt hole 1132 arranged in the width direction of the arc extinguishing device 30. The outside of the second end portion 113, i.e. the side close to the second side wall 12, has a second end portion positioning recess 1133. The second end portion positioning recess 1133 is also used for mortise and tenon cooperation with the second side wall 12.

[0054] As shown in Figure 5 The wall body stop 1214 is formed in the second wall body 121. Since the corresponding structures on the second wall body 121 are symmetrical to those on the first wall portion 111, the applicant will not describe the structure and function in detail. Similarly, the wall body fixing block screw hole 12111, the left head positioning boss 1212, the wall body support plate 1216, and the wall body stop avoidance gap 1215 of the wall body stop 1214 are consistent with the corresponding structures on the first wall portion 111, and thus will not be described in detail.

[0055] As to the aforementioned first end wall 122, the first end wall 122 is spliced with the aforementioned first end portion 112. Specifically, the aforementioned first end wall 122 comprises the aforementioned fitting along recessed cavity 1221 mentioned above, which is located on the inner side of the aforementioned first end wall 122, and is mortise and tenon jointed with the aforementioned first fitting along 1121 on the inner side of the aforementioned first end portion 112. Figure 5 The fitting tenon 1224 formed on the inner lower edge of the first end wall 122 is also shown in the figure. The fitting tenon 1224 is mortise and tenon jointed with the aforementioned first end portion positioning recess 1123.

[0056] The first tenon 1222 is provided on the outer side of the aforementioned first end wall 122 and close to the side of the aforementioned first side wall 11, which is mortise and tenon jointed or embedded with the first end portion positioning recess 1126 of the aforementioned first end portion 112.

[0057] Please refer to Figure 7 and in combination with Figure 5 , Figure 7 The aforementioned second observation semicircular hole 1223 opened on the aforementioned first end wall 122 is shown in more detail, which is combined with the aforementioned first observation semicircular hole 1125 on the aforementioned first end portion 12 to form a complete observation hole 300. Preferably, the aforementioned second observation semicircular hole 1223 also extends or is arranged along the height direction of the aforementioned arc extinguishing device 30, so that the aforementioned observation hole 300 extends or is arranged along the height direction of the aforementioned arc extinguishing device 30.

[0058] The first end wall bolt hole 1225 of the aforementioned first end wall 122 and the first end portion bolt hole 1124 on the aforementioned first end portion 112 form a complete hole for accommodating the aforementioned insulating sleeve 100 and the aforementioned fastener 200, and the separation surface of the aforementioned first end portion bolt hole 1124 and the aforementioned first end wall bolt hole 1225 is arranged along the normal direction, that is, perpendicular to the extension direction of the bolt hole. The aforementioned first end wall bolt hole 1225 is arranged along the width direction of the aforementioned arc extinguishing device 30.

[0059] Continuing to see Figure 5 , the aforementioned second end wall 123 is spliced with the second end portion 113. The inner side of the aforementioned second end wall 123 has a recessed cavity 1231, which is mortise and tenon jointed or embedded with the aforementioned second fitting along 1131 of the aforementioned second end portion 113.

[0060] The tenon 1232 is provided on the outer side of the aforementioned second end wall 123 and close to or towards the aforementioned first side wall 11, which is mortise and tenon jointed or embedded with the second end portion positioning recess 1133 on the second end portion 113.

[0061] A screw hole 1233 is also provided on the aforementioned second end wall 123. The screw hole 1233 and the second end bolt hole 1132 on the aforementioned second end 13 form a complete screw hole. The separation surface between the aforementioned screw hole 1233 and the aforementioned second end bolt hole 1132 is arranged along the normal direction, that is, perpendicular to the extension direction of the screw hole. The aforementioned screw hole 1233 is arranged along the width direction of the aforementioned arc extinguishing device 30.

[0062] See details Figure 6 A schematic diagram of the gas generating element 5 is shown, with only one of the pair of gas generating elements 5 shown. The pair of gas generating elements are respectively configured to mate with the aforementioned first sidewall 11 and second sidewall 12. The following only describes the structural features of the gas generating element 5 mates with the first sidewall 11. Since the structural features of the other gas generating element 5 mates with the aforementioned second sidewall 12 are basically the same as those of the gas generating element 5 mates with the aforementioned first sidewall 11, they will not be described in detail.

[0063] Typically, the aforementioned gas-generating component 5 is made of a gas-generating material, such as nylon, which is a thermoplastic material. When heated by an electric arc, it releases insulating gas, which helps extinguish the arc.

[0064] The gas generating component 5 includes a base plate portion 51, a dam 52, a partition plate 53, a first positioning plate 54, and a second positioning plate 55. The base plate portion 51 has a sheet structure. After the aforementioned pair of gas generating components 5 are installed, the pair of base plate portions 51 are spaced apart to form an arc channel.

[0065] The aforementioned dike 52 extends from the aforementioned base plate portion 51 toward the side wall 1 that it mates with, and is located below and on both sides of the grid leg of the grid plate 2 to which the aforementioned gas generating member 5 mates. In this embodiment, the aforementioned dike 52 has a three-sided enclosing structure.

[0066] The aforementioned partition 53 also extends from the aforementioned substrate portion 51 to the side wall 1 that cooperates with it. In this embodiment, there is only one partition 53, which passes through a gap between the grid legs of the aforementioned grid plate 2.

[0067] The first positioning plate 54 and the second positioning plate 55 extend from the base plate 51 to the side wall 1 to be matched, and position the legs of the grid sheet 2. The first positioning plate 54 is sparse relative to the second positioning plate 55, and the second positioning plate 55 is dense relative to the first positioning plate 54. The reason is that there are two legs of the grid sheet between adjacent first positioning plates 54, and there is only one leg of the grid sheet between adjacent second positioning plates 55. The positioning effect of the first positioning plate 54 is matched with the wall positioning line 1113. Specifically, there are also two legs of the grid sheet between adjacent wall positioning lines 1113, and the first positioning plate 54 is staggered with the wall positioning line 1113 by one leg of the grid sheet, so that the positioning effect is achieved.

[0068] The base plate 51 has a downward opening 511 on the top edge, which matches a group of grid sheets 2 corresponding to the arc inlet of the array. The lower edge of the base plate 51 has an extension 512 extending downward, which is used to isolate the long and short contact blades of the movable contact 10. The lower edge of the base plate 51 corresponding to the wall fixing block 1111 is provided with a mounting protrusion 513 and a ring-shaped coffer 514. The mounting protrusion 513 protrudes from the base plate 51 to the other gas generating member 5, and the ring-shaped coffer 514 extends to the wall fixing block 1111 and matches the wall fixing block screw hole 11111 on the wall fixing block 1111.

[0069] The coffer 52 has a matching circular hole 521 on the two side surfaces, and the partition plate 53 has a slot-shaped hole 531. The matching circular hole 521 and the slot-shaped hole 531 are matched with the positioning pin shaft 400.

[0070] In summary, the arc extinguishing device of the switch provided by the utility model includes a pair of side walls 1, the array of the grid sheet 2 between the side walls 1, a pair of side walls 1 are fixed to each other through at least one fastener 200, the insulating sleeve 100 is sleeved on the fastener 200, the insulating sleeve 100 is blocked on the gap of the pair of side walls 1, and the insulating sleeve 100 prevents the electric arc gas from escaping from the joint gap and contacting the fastener 200 to cause breakdown.

Claims

1. An arc quenching device for a switch comprising a pair of side walls (1) mated face to face to each other and a plurality of vanes (2) arranged between the pair of side walls (1), said pair of side walls (1) being tightened by a fastener (200), characterized in that: An insulating sleeve (100) is sleeved on at least one of the fasteners (200), and the insulating sleeve (100) is arranged at the joint of the pair of side walls (1) to prevent arc gas from escaping from the joint of the pair of side walls (1) and causing breakdown of the fastener (200).

2. An arc quenching device for a switch according to claim 1, characterized in that: An observation hole (300) is formed on the pair of side walls (1) and at a position corresponding to the insulating sleeve (100), and the observation hole (300) extends to the insulating sleeve (100).

3. An arc quenching device for a switch according to claim 2, characterized in that: The pair of side walls (1) are respectively a first side wall (11) and a second side wall (12). The first side wall (11) comprises a first wall portion (111), a first end portion (112) and a second end portion (113). The first end portion (112) is arranged at the right upper portion of the first wall portion (111), and the second end portion (113) is arranged at the left upper portion of the first wall portion (111). The first wall portion (111), the first end portion (112) and the second end portion (113) jointly form the first side wall (11) to be open on the side facing the second side wall (12). The second side wall (12) comprises a first wall body (121), a first end wall (122) and a second end wall (123). The first end wall (122) is arranged at the right upper portion of the first wall body (121), and the second end wall (123) is arranged at the left upper portion of the first wall body (121). The first wall body (121), the first end wall (122) and the second end wall (123) jointly form the second side wall (12) to be open on the side facing the first side wall (11).

4. An arc quenching device for a switch according to claim 3, characterized in that: The first end portion (112) is provided with a first end portion bolt hole (1124), and the first end wall (122) is provided with a first end wall bolt hole (1225) corresponding to the position of the first end portion bolt hole (1124). When the first side wall (11) and the second side wall (12) are arranged face to face, the first end wall bolt hole (1225) and the first end portion bolt hole (1124) form a complete bolt hole for accommodating the fastener (200) and the insulating sleeve (100) sleeved thereon.

5. An arc quenching device for a switch according to claim 4, characterized in that: The first end portion (112) is provided with a first observation semicircular hole (1125) in the shape of a C-shaped cross section and facing the first end wall (122) in the height direction of the arc extinguishing device (30), and the first end wall (122) is provided with a second observation semicircular hole (1223) in the shape of a C-shaped cross section and corresponding to the first observation semicircular hole (1125) and facing the first end portion (112) in the height direction of the arc extinguishing device (30). When the first side wall (11) and the second side wall (12) are arranged face to face, the first observation semicircular hole (1125) and the second observation semicircular hole (1223) jointly form the observation hole (300) in the shape of a circular cross section.

6. An arc quenching device for a switch according to claim 5, characterized in that: A first matching edge (1121) is formed on the first end portion (112) and at a position left of the first observation semi-circular hole (1125), a matching cavity (1122) is formed on the lower part of the first matching edge (1121) and at a side opposite to the first observation semi-circular hole (1125), a matching edge fitting recess (1221) corresponding to the first matching edge (1121) is formed on the first end wall (122) and at a position left of the second observation semi-circular hole (1223), the first matching edge (1121) and the matching edge fitting recess (1221) are matched with each other.

7. An arc quenching device for a switch according to claim 6, characterized in that: The first end portion bolt hole (1124) is opposite to the matching cavity (1122), and the first observation semi-circular hole (1125) is communicated with the matching cavity (1122).

8. An arc quenching device for a switch according to claim 3, characterized in that: A wall portion fixing block (1111) is formed on the right lower part of the first wall portion (111), a left end portion positioning boss (1112) is formed on the left lower part, a wall portion supporting plate (1116) is formed at a position between the wall portion fixing block (1111) and the left end portion positioning boss (1112), a right end portion positioning boss (1117) is extended on the upper part of the wall portion fixing block (1111), and the wall portion fixing block (1111), the left end portion positioning boss (1112), the right end portion positioning boss (1117) and the wall portion supporting plate (1116) are towards a side of the first wall body (121); a wall body fixing block (1211) is formed on the right lower part of the first wall body (121), a left head positioning boss (1212) is formed on the left lower part, a wall body supporting plate (1216) is formed at a position between the wall body fixing block (1211) and the left head positioning boss (1212), a right head positioning boss (1217) is extended on the upper part of the wall body fixing block (1211), and the wall body fixing block (1211), the left head positioning boss (1212), the right head positioning boss (1217) and the wall body supporting plate (1216) are towards a side of the first wall portion (111).

9. An arc quenching device for a switch according to claim 8, characterized in that: A positioning member (6) for preventing arc gas from invading the grid leg is arranged on the grid leg of the grid (2).

10. An arc quenching device for a switch according to claim 9, characterized in that: The arc extinguishing device further comprises a pair of gas generating members (5), the pair of gas generating members (5) are located on the inner side of the grid (2), and a space between the pair of gas generating members (5) is formed as an arc channel.

Images