CN218730618U

CN218730618U - Switch unit and isolating switch

Info

Publication number: CN218730618U
Application number: CN202221175327.9U
Authority: CN
Inventors: 王龙江; 张谦; 晏国云; 马倩; 杨文学
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2023-03-24
Anticipated expiration: 2032-05-09

Abstract

The application discloses switch unit and isolator relates to electrical apparatus technical field. The switch unit comprises a shell, a movable contact component and a fixed contact which are arranged in the shell, wherein an arc spraying channel is formed in the shell, and a plurality of grid pieces are arranged in the arc spraying channel at intervals, so that electric arcs formed when the movable contact component and the fixed contact are separated are guided to the arc spraying channel and are divided by the grid pieces. The arc extinguishing effect can be improved, and the durability of the isolating switch is guaranteed.

Description

Switch unit and isolating switch

Technical Field

The application relates to the technical field of electric appliances, in particular to a switch unit and an isolating switch.

Background

When a moving contact and a static contact of the isolating switch are disconnected, electric arcs can be generated between the contacts, the electric arcs are sucked into an arc spraying channel to be cooled and extinguished, a part of electric arcs or ionized gas is sprayed out from an arc spraying port to form flashover, and in a product use specification, manufacturers can mark the flashover distance of a product, namely the flashover distance of the electric arcs when the current is cut off according to a specified program under specified conditions, such as rated voltage and power factor.

The temperature of the electric arc reaches thousands of degrees centigrade, the electric arc also has conductive performance, and the generated harm is very serious. In the power industry, the electric arc sprayed by the isolating switch may be directly sprayed to grounded metal frames such as a switch cabinet, a distribution panel and the like, which may cause the damage of metal conductors, abnormal surge voltage of circuits, burn operators and burn equipment, cause the aging of insulators and other conditions, and seriously cause short-circuit fault, explosion and fire hazard, threaten the safety of life and property, and in the industries such as petroleum, chemical industry, mining industry and the like, the damage of flashover needs to be paid attention.

At present, in order to reduce the distance of the arc flying out of the isolating switch, the distance of the arc spraying channel is generally increased, however, the arc is generally kept in a burning state in the arc spraying channel, and the shell or other switch components in the shell can be damaged, which is not favorable for meeting the requirement of the durability of the isolating switch.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a switch unit and isolator can promote the arc extinguishing effect to guarantee isolator's durability.

The embodiment of the application is realized as follows:

in one aspect of the embodiments of the present application, a switch unit is provided, which includes a housing, and a moving contact assembly and a static contact disposed in the housing, wherein an arc spraying channel is formed in the housing, and a plurality of grids are disposed at intervals in the arc spraying channel, so that an arc formed when the moving contact assembly and the static contact are separated is guided to the arc spraying channel and is divided by the grids.

Optionally, the arc spraying channel comprises an arc spraying inlet facing the moving contact assembly, and an arc spraying outlet opening on the shell, and the width of the arc spraying inlet is larger than that of the arc spraying outlet.

Optionally, a trapezoidal channel is formed between adjacent grid plates, and the width of the trapezoidal channel close to the arc spraying inlet is greater than the width of the trapezoidal channel close to the arc spraying outlet.

Optionally, two ends of the grid along the arc spraying channel direction are respectively provided with a first protrusion and second protrusions located on two opposite sides of the first protrusion.

Optionally, when the grid is located at the edge of the arc spraying channel, the length of the first protrusion facing one end of the fixed contact is greater than the length of the second protrusion, and the first protrusion is arc-shaped.

Optionally, when the grid is located in the middle of the arc spraying channel, the length of the first protrusion is smaller than that of the second protrusion.

Optionally, a plurality of positioning grooves are formed in the arc spraying channel, and the plurality of grid pieces and the positioning grooves are arranged in a one-to-one correspondence manner.

Optionally, the grid is a metal sheet.

Optionally, the movable contact assembly includes movable contact pads arranged in parallel, and a movable contact disposed between the two movable contact pads, and the movable contact pads are rotatably connected to the housing.

In another aspect of the embodiments of the present application, there is provided an isolation switch including the switch unit as described in any one of the above.

The beneficial effects of the embodiment of the application include:

the switch unit and isolator that this application embodiment provided through set up a plurality of bars pieces at the interval in spouting the arc passageway, can form the passageway of reposition of redundant personnel between the adjacent bars piece, when electric arc through spouting the arc passageway, can cut apart electric arc to add a plurality of nearly utmost point pressure drops, in order to play the effect of rapid cooling electric arc, thereby reduce the blowout distance of electric arc. Adopt above-mentioned form, can promote the arc extinguishing effect, reduce the influence that the high temperature that the electric arc produced and electric arc self electric conductivity led to the fact isolator to guarantee isolator's durability and the stability when using.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a switch unit provided in an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of a gate provided in an embodiment of the present application;

fig. 4 is a second schematic structural diagram of a gate provided in the embodiment of the present application;

fig. 5 is a schematic structural diagram of a housing provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a movable contact assembly according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a disconnector provided in the embodiment of the present application.

Icon: 100-a switching unit; 110-a housing; 112-arc spraying channel; 1122-an arc ejection inlet; 1124-arc spraying outlet; 1126-trapezoidal channels; 114-a positioning groove; 120-moving contact assembly; 122-movable contact disc; 124-moving contact; 130-a fixed contact; 140-a grid sheet; 142-a first projection; 144-a second projection; 200-an isolating switch; 210-operating mechanism.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

At present, in order to reduce the distance of the arc flying out of the isolating switch, the distance of the arc spraying channel is generally increased, however, the arc is generally kept in a burning state in the arc spraying channel, and the shell or other switch components in the shell can be damaged, which is not favorable for meeting the requirement of the durability of the isolating switch. In view of the above problems, embodiments of the present application provide the following technical solutions to overcome the above technical problems.

Referring to fig. 1 and 2, an embodiment of the present application provides a switch unit 100, which includes a housing 110, and a movable contact assembly 120 and a stationary contact 130 disposed in the housing 110, wherein an arc spraying channel 112 is formed in the housing 110, and a plurality of grids 140 are disposed at intervals in the arc spraying channel 112, so that an arc formed when the movable contact assembly 120 and the stationary contact 130 are separated is guided to the arc spraying channel 112 and is divided by the grids 140.

Specifically, the moving contact assembly 120 and the fixed contact 130 arranged in the housing 110 enable the switch unit 100 to meet a required on-off requirement through the cooperation between the moving contact assembly 120 and the fixed contact 130, so as to control an accessed circuit. Upon separation between the moving contact assembly 120 and the stationary contact assembly 130, an arc is generated between the contacts, and the arc is ejected out of the housing 110 through the arc ejection channel 112. By arranging a plurality of grids 140 at intervals in the arc spraying passage 112, the arc spraying passage 112 can form a plurality of shunting passages, so that the grids 140 can divide and shunt the arc.

As can be understood, the switch unit 100 includes two opposite fixed contacts 130, and the two fixed contacts 130 are disposed on opposite sides of the housing 110, so as to make or break the two fixed contacts 130 through the fixed contact 130 assembly. In order to ensure the arc extinguishing effect, two arc spraying channels 112 are correspondingly arranged, and the arc spraying channels 112 and the fixed contacts 130 are arranged in a staggered manner.

The switch unit 100 that this application embodiment provided, through set up a plurality of bars pieces 140 at the interval in spouting arc passageway 112, can form the passageway of reposition of redundant personnel between the adjacent bars piece 140, when electric arc through spouting arc passageway 112, can cut apart electric arc to overlap a plurality of nearly extremely voltage drops, in order to play the effect of rapid cooling electric arc, thereby reduce the blowout distance of electric arc. Adopt above-mentioned form, can promote the arc extinguishing effect, reduce the influence that the high temperature that the electric arc produced and electric arc self electric conductivity led to the fact isolator to guarantee isolator's durability and the stability when using.

As shown in fig. 2, the arc spraying passage 112 includes an arc spraying inlet 1122 facing the movable contact assembly 120 and an arc spraying outlet 1124 opened on the housing 110, and the width of the arc spraying inlet 1122 is greater than that of the arc spraying outlet 1124.

Specifically, by forming the arcing inlet 1122 at a position of the arcing channel 112 facing the movable contact assembly 120, the generated arc can be better introduced into the arcing channel 112 from the arcing inlet 1122. In addition, the arc outlet 1124 is formed on the housing 110 to enable the arc to fly out from a specific position, the width of the arc inlet 1122 is larger than that of the arc outlet 1124, so that the arc can be better introduced, the temperature of the arc is higher, air in the housing 110 rapidly expands to generate air flow, the arc is ejected from the arc ejection channel 112 while the air flow flows out from the arc ejection channel 112, and the air pressure difference is favorably formed by adopting the form that the inlet is wide and the outlet is narrow, so that the arc can fly out in a specific path under the influence of the air pressure, and the influence on other parts in the housing 110 is avoided. Meanwhile, the narrow arc spraying outlet 1124 is arranged on the shell 110, so that the condition that the radiation area of the flying arc is influenced by the external environment is too large and has no certainty can be avoided, and the safety in use is ensured.

With continued reference to fig. 2, trapezoidal channels 1126 are formed between adjacent louvers 140, and the width of the trapezoidal channels 1126 near the arc ejection inlet 1122 is greater than the width near the arc ejection outlet 1124.

Specifically, the trapezoidal channels 1126 are formed between the adjacent grids 140, so that the overall shape of the arc spraying channels 112 can be adapted, and the width of the trapezoidal channels 1126 close to the arc spraying inlets 1122 is larger than that of the trapezoidal channels 1126 close to the arc spraying outlets 1124, which is beneficial to ensuring smooth passing of an arc and improving an arc extinguishing effect.

As shown in fig. 2, 3 and 4, the two ends of the grid 140 along the arc spraying channel 112 are respectively provided with a first protrusion 142 and second protrusions 144 located at two opposite sides of the first protrusion 142.

Specifically, the first protrusion 142 and the second protrusions 144 located at two opposite sides of the first protrusion 142 can better perform an arc striking function, so that the arc can pass through the grid 140.

As shown in fig. 2 and 4, when the grid 140 is located at the edge of the arc spraying channel 112, the length of the first protrusion 142 facing one end of the fixed contact 130 is greater than the length of the second protrusion 144, and the first protrusion 142 is configured in an arc shape.

Specifically, when the grid 140 is located at the edge of the arc spraying channel 112, since one end of the grid 140 facing the static contact 130 component is farther from the static contact 130 component, in order to better guide the arc, the length of the first protrusion 142 of the grid 140 is longer than the length of the second protrusion 144, so that the arc is directly guided to the middle position of the grid 140. In addition, the first protrusion 142 is arranged to be arc-shaped, so that the moving contact assembly 120 is closer to the fixed contact assembly 130 while the action of the fixed contact assembly is not delayed, and the arc striking effect is improved.

As shown in fig. 2 and 3, when the grid 140 is located in the middle of the arc spraying channel 112, the length of the first protrusion 142 is smaller than that of the second protrusion 144.

Specifically, by setting the length of the first protrusion 142 to be smaller than the length of the second protrusion 144, the generated arc can be guided to the first protrusion 142 through the second protrusion 144, so that the arc passes through the middle of the grid 140, and the influence on the housing 110 caused by burning the housing 110 when the arc passes along the housing 110 is avoided.

As shown in fig. 5, a plurality of positioning slots 114 are formed in the arc spraying channel 112, and a plurality of grids 140 are arranged in one-to-one correspondence with the positioning slots 114.

By adopting the above form, only need with bars piece 140 insert the constant head tank 114 can, be favorable to simplifying the setting form, promote assembly efficiency, in addition, each bars piece 140 can set up to the same structure, when assembling bars piece 140, need not to distinguish the tip of bars piece 140, be favorable to reducing the probability of assembly error, and reduce the operation degree of difficulty, only need with bars piece 140 insert after the constant head tank 114, support through casing 110 and hold spacing can.

In an alternative embodiment of the present application, the grid 140 is a metal sheet. In an example, the grid sheet 140 may be an aluminum sheet, a copper sheet, an iron sheet, or the like, which can better play a role of heat dissipation while ensuring an arc striking effect, so that an arc is rapidly extinguished, and an arc extinguishing effect is improved.

As shown in fig. 6, the movable contact assembly 120 includes movable contact pads 122 disposed in parallel, and a movable contact 124 disposed between the two movable contact pads 122, wherein the movable contact pads 122 are rotatably connected to the housing 110.

Specifically, by arranging the movable contact discs 122 in parallel and arranging the movable contact 124 between the two movable contact discs 122, when the movable contact 124 is separated from the fixed contact 130 to generate an electric arc, the movable contact discs 122 can block the electric arc, and by adopting the above form, the electric arc can only pass through between the two movable contact discs 122 and is ejected out through the arc ejection channel 112, so that the electric arc is prevented from being guided by other components in the shell 110 to form a short circuit, and the reliability in use is ensured.

As shown in fig. 7, the embodiment of the present application further discloses an isolation switch 200, which includes the switch unit 100 in the foregoing embodiment. The isolating switch 200 includes a plurality of stacked switch units 100, and an operating mechanism 210 connected to the switch units 100, so that the operating mechanism 210 drives the switch units 100 to operate, thereby implementing a desired opening or closing operation. The disconnector 200 comprises the same structure and advantageous effects as the switch unit 100 in the previous embodiment. The structure and the advantages of the switch unit 100 have been described in detail in the foregoing embodiments, and are not described in detail herein.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A switch unit (100) is characterized by comprising a shell (110), and a movable contact assembly (120) and a fixed contact (130) which are arranged in the shell (110), wherein an arc spraying channel (112) is formed in the shell (110), a plurality of grid pieces (140) are arranged in the arc spraying channel (112) at intervals, so that an electric arc formed when the movable contact assembly (120) is separated from the fixed contact (130) is guided to the arc spraying channel (112) and is divided by the grid pieces (140), and a first protrusion (142) is arranged on each grid piece (140) along the direction of the arc spraying channel (112).

2. The switch unit (100) according to claim 1, wherein the arcing channel (112) comprises an arcing inlet (1122) facing the movable contact assembly (120) and an arcing outlet (1124) opening on the housing (110), the arcing inlet (1122) having a width greater than a width of the arcing outlet (1124).

3. The switch unit (100) of claim 2, wherein trapezoidal channels (1126) are formed between adjacent louvers (140), and a width of the trapezoidal channels (1126) proximate the arc ejection inlet (1122) is greater than a width proximate the arc ejection outlet (1124).

4. The switch unit (100) according to any one of claims 1 to 3, wherein the grid (140) is provided with a first protrusion (142) at each end in the direction of the arc spraying channel (112), and a second protrusion (144) at opposite sides of the first protrusion (142).

5. The switch unit (100) of claim 4, wherein for the gate (140) located at the edge, the length of the first protrusion (142) facing one end of the fixed contact (130) is greater than the length of the second protrusion (144), and the first protrusion (142) is configured in an arc shape.

6. The switch unit (100) according to claim 4, characterized in that for the grid (140) located in the middle of the arcing channel (112), the length of the first protrusion (142) is smaller than the length of the second protrusion (144).

7. The switch unit (100) according to any one of claims 1 to 3, wherein a plurality of positioning slots (114) are provided in the arc spraying channel (112), and a plurality of grid pieces (140) are provided in one-to-one correspondence with the positioning slots (114).

8. The switching cell (100) according to any of claims 1 to 3, wherein the grid (140) is a metal sheet.

9. The switching unit (100) according to any one of claims 1 to 3, wherein the movable contact assembly (120) comprises movable contact pads (122) arranged in parallel and a movable contact (124) arranged between the two movable contact pads (122), the movable contact pads (122) being rotatably connected with the housing (110).

10. A disconnector (200) characterized in that it comprises a switching unit (100) according to any one of claims 1-9.