Electric appliance switch with equipotential connection structure

Abstract

The utility model discloses an electric appliance switch with an equipotential connection structure, which comprises an electric appliance switch main body and an arc extinguishing system main body, a static contact is arranged in the electric appliance switch main body, and an arc striking angle is arranged on the static contact; the top of the electric appliance switch main body is provided with an installation cavity for the arc extinguishing system main body to be vertically inserted, after the arc extinguishing system main body is installed in the installation cavity, the contact plate is in contact with the arc striking angle, the contact plate is provided with a screw hole, the arc striking angle is provided with a through hole, and a shell of the electric appliance switch main body is provided with an installation hole corresponding to the through hole. Locking bolts are installed among the installation holes, the through holes and the screw holes, and the contact plate and the arc striking angle are in equipotential connection. According to the utility model, the arc striking angle is in equipotential connection with the static contact, so that the moving resistance of an arc root on the surface of the arc striking grid plate is greatly reduced, the arc on the surface of the arc striking grid plate quickly moves towards the arc extinguishing grid plate group along the surface of the arc striking grid plate, and in addition, disassembly and later maintenance are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the related technical field of electric appliance switch, concretely is an electric appliance switch with equipotential connection structure. BACKGROUND

[0002] In the process of load breaking and breaking fault current of electric appliance switch, the voltage between contacts can cause air dielectric discharge and form arc. Low-voltage electric appliance switch often adopts arc extinguishing system composed of arc extinguishing grid to cut and cool the generated arc to extinguish the arc and prevent the arc from damaging the electrical equipment and power distribution system.

[0003] In order to make the arc generated at the contact of electric appliance switch quickly enter the arc extinguishing system and be cut by arc extinguishing grid to cool and extinguish the arc, two methods of gas blow and magnetic blow are often used. That is, the high temperature of arc makes the composite gas generating material crack into small molecules to form particle gas flow to push the arc into the arc extinguishing system to form gas blow effect; the structure of contact or arc extinguishing system in electric appliance switch is improved to make the induced magnetic field generated by the internal current push the arc into the arc extinguishing system. However, the effect of the two methods is related to the current energy, and when the current energy is low, the effect of gas blow and magnetic blow is obviously weakened. Therefore, the grid pieces at the two ends of the arc extinguishing grid group of arc extinguishing system are often connected to the static contact and moving contact of electric appliance switch respectively to make the arc root quickly transfer and make the arc quickly enter the arc extinguishing system to shorten the arc burning time, reduce the damage of arc to the contact system and improve the arc extinguishing effect and electrical life of electric appliance switch.

[0004] At present, the equal potential connection of the moving contact and the arc extinguishing system is usually realized by short gap arc jump, and the equal potential connection of the static contact and the arc extinguishing system is usually realized by placing and adhering, which cannot guarantee the reliable equal potential connection of the static contact arc extinguishing system. If other ways are used for rigid connection, the arc extinguishing system will be difficult to disassemble. Especially for frame circuit breakers, since the arc extinguishing system of the frame circuit breaker adopts a modular type and can be separated from the circuit breaker body, the conventional equal potential connection cannot guarantee reliable connection and convenient disassembly of the arc extinguishing system at the same time, so as to facilitate maintenance and replacement. At the same time, since the electric appliance switch usually adopts a moving contact system with a main contact and an arc contact, the arc is generated only on the arc contact, which guarantees the breaking performance and enables the main contact to normally make and break without being affected by the arc. Therefore, whether the arc contact works normally determines the making and breaking performance of the electric appliance switch. With the increase of the number of making and breaking arcs, the conductive parts of the arc contact and other parts in contact with the arc generation position are gradually eroded by the arc, the overstroke of the arc contact from making to breaking gradually decreases, and finally loses the function. At this time, the arc can be generated at the arc contact and the main contact at the same time, which causes the electric appliance switch to fail to break and the main conductive circuit to burn out. Therefore, necessary means need to be added to detect the degree of the arc contact of the frame circuit breaker relative to the main contact from making to breaking, guarantee the reliability of the arc generation action of the arc contact, and ensure the normal making and breaking of the electric appliance switch.

[0005] Therefore, how to realize the reliable electrical connection of the arc extinguishing system of the electric appliance switch, especially the frame circuit breaker, and the static contact, realize the convenient disassembly of the arc extinguishing system, facilitate maintenance and rapid replacement, and detect the normal work of the arc contact and whether the arc contact from making to breaking is reliable in real time, has become a problem to be solved in the structural design of the arc extinguishing system. Content of the utility model

[0006] In order to solve the defects in the prior art, the utility model provides an electric appliance switch with an equal potential connection structure.

[0007] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0008] The utility model discloses an electric appliance switch with an equal potential connection structure, which comprises an electric appliance switch body and an arc extinguishing system body, a static contact is installed in the electric appliance switch body, an arc generation corner is arranged on the static contact, characterized in that the arc extinguishing system body comprises a shell with an arc extinguishing grid group in the inside, an arc generation grid is arranged in the inside of the shell, the arc generation grid comprises a grid body, one end of the grid body is provided with a first bending flat plate located at the lower part of the lowermost arc extinguishing grid of the arc extinguishing grid group, the other end of the grid body is provided with a second bending flat plate, and the end of the second bending flat plate is provided with a contact plate bent multiple times; and the contact plate is exposed outside the shell and vertically upwards.

[0009] The top of the electric appliance switch body is provided with a mounting cavity for vertically inserting the arc extinguishing system body, and the static contact is arranged at the bottom of the mounting cavity, and the arc striking horn is arranged on the static contact in a vertically upward state, and after the arc extinguishing system body is mounted in the mounting cavity, the contact plate is in contact with the arc striking horn, the contact plate is provided with a threaded hole, the arc striking horn is provided with a through hole, and the shell of the electric appliance switch body is provided with a mounting hole corresponding to the through hole, and a locking bolt is mounted between the mounting hole, the through hole and the threaded hole to connect the contact plate and the arc striking horn in an equipotential manner; the arc striking horn is provided with a potential measuring point A and a potential measuring point B.

[0010] As a preferred technical scheme of the utility model, the arc striking grid piece is internally provided with an iron core at the bending position of the contact plate.

[0011] As a preferred technical scheme of the utility model, the mounting hole is internally mounted with a bottom plug for sealing the mounting hole.

[0012] As a preferred technical scheme of the utility model, the electric appliance switch body and the shell of the arc extinguishing system body are further mounted with a positioning bolt.

[0013] As a preferred technical scheme of the utility model, the potential measuring point A and the potential measuring point B are arranged along the current direction and are apart from each other by a certain distance.

[0014] As a preferred technical scheme of the utility model, the second bending flat plate is provided with a grid piece silver point for contacting the arc contact in the arc extinguishing system body.

[0015] The utility model discloses the beneficial effect is:

[0016] 1、the electric appliance switch with equipotential connection structure in the contact plate of arc striking grid piece is connected with static contact in equipotential manner through arc striking horn, greatly reduces the moving resistance of arc root on the surface of arc striking grid piece, makes the arc on the surface of arc striking grid piece quickly move to arc extinguishing grid group along its surface, wherein the contact plate is provided with a threaded hole, the arc striking horn is provided with a through hole, and the shell of the electric appliance switch body is provided with a mounting hole corresponding to the through hole, and a locking bolt is mounted between the mounting hole, the through hole and the threaded hole to connect the contact plate and the arc striking horn in equipotential manner, which is convenient for dismounting and post-maintenance.

[0017] 2、the electric appliance switch with equipotential connection structure is provided with potential measuring point A and potential measuring point B on the arc striking horn, can determine the action time of arc contact prior or lag main contact by measuring the potential difference waveform change time between potential measuring point A and potential measuring point B, and detect the reliability of arc contact first closing and then opening. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation to the present application. In the drawings:

[0019] Figure 1 is a structural schematic view of the electrical switch with the equipotential connection structure of the present application;

[0020] Figure 2 is a structural schematic view of the installation cavity of the electrical switch with the equipotential connection structure of the present application;

[0021] Figure 3 is a structural schematic view of the arc drawing grid sheet of the electrical switch with the equipotential connection structure of the present application;

[0022] Figure 4 is a structural schematic view of the connection between the arc drawing grid sheet and the arc drawing angle of the electrical switch with the equipotential connection structure of the present application;

[0023] Figure 5 is a first schematic view of the current and arc path in the embodiment of the electrical switch with the equipotential connection structure of the present application;

[0024] Figure 6 is a second schematic view of the current and arc path in the embodiment of the electrical switch with the equipotential connection structure of the present application

[0025] Figure 7 is a schematic view of the current path in the critical state of the initial contact between the arc contact and the arc drawing grid sheet in the embodiment of the present application;

[0026] Figure 8 is a schematic view of the current path in the critical state of the initial contact between the main contact and the static contact in the embodiment of the present application.

[0027] In the drawings: 1, electrical switch main body; 2, arc extinguishing system main body; 201, shell; 202, arc extinguishing grid sheet group; 203, arc drawing grid sheet; 204, grid sheet main body; 205, grid sheet silver point; 206, first bending flat plate; 207, second bending flat plate; 208, contact plate; 209, screw hole; 3, static contact; 4, arc drawing angle; 5, installation cavity; 6, through hole; 7, mounting hole; 8, locking bolt; 9, iron core; 10, bottom plug; 11, potential measuring point A; 12, potential measuring point B; 13, arc contact; 14, arc contact silver point; 15, main contact; 16, main contact silver point; 17, static contact silver point. DETAILED DESCRIPTION

[0028] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model.

[0029] Embodiment: as Figures 1-8 The utility model discloses an electric appliance switch with equal potential connection structure, including electric appliance switch main body 1 and arc extinguishing system main body 2, install static contact 3 in electric appliance switch main body 1, be equipped with arc leading angle 4 on static contact 3, the arc extinguishing system main body include the casing 201 with arc extinguishing grid piece group 202 in the inside, the inside of casing 201 is equipped with arc leading grid piece 203, arc leading grid piece 203 includes grid piece main body 204, one end of grid piece main body 204 is equipped with the first bending flat plate 206 in the lower part of the most lower end arc extinguishing grid piece of arc extinguishing grid piece group 202, the other end of grid piece main body 204 is equipped with the second bending flat plate 207, and the end of second bending flat plate 207 is equipped with the contact plate 208 of multiple bending, and contact plate 208 exposes the outside of casing 201, and contact plate 208 is vertically upwards,

[0030] As Figure 2 The top of electric appliance switch main body 1 is equipped with the installation cavity 5 for the vertical insertion of arc extinguishing system main body 2, and static contact 3 is arranged at the bottom of installation cavity 5, arc leading angle 4 is arranged on static contact 3 in a vertically upward state, and after arc extinguishing system main body 2 is installed in installation cavity 5, contact plate 208 is in contact with arc leading angle 4, screw hole 209 is arranged on contact plate 208, through hole 6 is arranged on arc leading angle 4, and mounting hole 7 corresponding to through hole 6 is arranged on the casing of electric appliance switch main body 1, locking bolt 8 is mounted between mounting hole 7, through hole 6 and screw hole 209 to connect contact plate 208 and arc leading angle 4 in equal potential. The contact plate 208 in arc leading grid piece 203 is connected to static contact 3 in equal potential through arc leading angle 4, which greatly reduces the moving resistance of arc root on the surface of arc leading grid piece 203, so that the arc on the surface of arc leading grid piece 203 moves quickly along the surface to arc extinguishing grid piece group 202, wherein screw hole 209 is arranged on contact plate 208, through hole 6 is arranged on arc leading angle 4, and mounting hole 7 corresponding to through hole 6 is arranged on the casing 201 of electric appliance switch main body 1, locking bolt 8 is mounted between mounting hole 7, through hole 6 and screw hole 209 to connect contact plate 208 and arc leading angle 4 in equal potential, which facilitates disassembly and later maintenance.

[0031] Arc leading angle 4 and arc leading grid piece 203 adopt iron magnetic material copper plating type to ensure the strength of arc leading angle 4 and enhance the conductivity of arc leading angle 4 and arc leading grid piece 203.

[0032] As Figure 5As shown, the arc starting grid 203 is internally provided with a core 9 at the bending of the contact plate 208, the core is made of ferromagnetic material, which can enhance the intensity of the induced magnetic field inside the bending structure of the arc starting grid 203, enhance the magnetic blow effect, increase the force of the arc, accelerate the moving speed of the arc to the arc extinguishing grid group 202, and at the same time, increase the heat capacity of the arc starting grid 203 and improve the ability of resisting high-temperature ablation of the arc.

[0033] When the arc is generated between the arc contact silver point 14 of the arc contact 13 and the grid silver point 205 of the arc starting grid 203, since the arc starting grid 203 is connected to the static contact 3 through the arc starting angle 4, the moving resistance of the arc root on the surface of the arc starting grid 203 is greatly reduced, so that the arc on the surface of the arc starting grid 203 quickly moves along the surface to the arc extinguishing grid group 202. At the same time, the direction of the induced magnetic field generated by the core 9 at the bending of the arc extinguishing grid group 202 is as shown in Figure 5 and Figure 6 As shown, when the current direction is as shown in Figure 5 The induced magnetic field makes the Lorentz force of the arc towards the arc extinguishing grid group 202, so that the magnetic blow effect is enhanced. The equipotential and enhanced magnetic blow structure greatly shortens the time from the state shown in Figure 5 to the state shown in Figure 6 , and accelerates the moving speed of the arc to the arc extinguishing grid group 202.

[0034] The second bending plate 207 is provided with a grid silver point 205 in contact with the arc contact 13 in the arc extinguishing system main body 2.

[0035] The mounting hole 7 is internally provided with a bottom plug 10 for sealing the mounting hole 7, so that the internal conductive part is electrically isolated from the outside of the electric appliance switch.

[0036] The electric appliance switch main body 1 and the shell of the arc extinguishing system main body 2 are further provided with a positioning bolt, which is multi-directionally positioned and has good fixing effect.

[0037] As shown in Figure 3 The arc starting angle 4 is provided with a potential measuring point A11 and a potential measuring point B12, the potential measuring point A11 and the potential measuring point B12 are arranged along the current direction and are apart from each other by a certain distance. The steps of the arc contact 13 detection are as follows:

[0038] Figure 7 The current path schematic diagram of the critical state of the initial contact between the arc contact 13 and the arc starting grid 203 of the embodiment of the utility model is as shown in Figure 7For the critical state of the main contact 15 and the static contact 3 initial contact, the current path schematic diagram is shown in the figure.The moving contact system of the electric switch is composed of a plurality of arc contacts 13 and a plurality of main contacts 15, the main contact 15 has a main contact silver point 16, the main contact silver point 16 can be in contact with a static contact silver point 17, and the main contact silver point 16 can realize the conduction of the main circuit.

[0039] When the electric switch is from the opening state to the closing state, the arc contact 13 and the main contact 15 rotate clockwise around the moving contact system rotation center together until Figure 7 The state shown in the figure. At this time, the arc contact silver point 14 and the grid silver point 205 are in initial contact, and the initial conduction of the current between the arc contact 13 and the arc grid 203 is realized. AB AB Therefore, the potential difference between the potential measuring point A11 and the potential measuring point B12 is U AB .

[0040] In order to facilitate signal acquisition, the arc angle 4 and the contact plate 208 are fixed by bolts to form an equipotential connection mode, the arc angle 4 can be selected from other alloy materials such as iron-nickel alloy and other alloy materials different from the arc grid 203, or the cross section of the arc angle is adjusted to change the resistance between the potential measuring point A11 and the potential measuring point B12, so as to change the potential difference signal intensity between the potential measuring point A11 and the potential measuring point B12.

[0041] The electric switch continues to act on the closing state, and the contact system continues to rotate clockwise around the moving contact system rotation center until Figure 8 The state shown in the figure. At this time, the main contact silver point 16 and the static contact silver point 17 are in initial contact, and the initial conduction of the current between the main contact 15 and the static contact 3 is realized. Figure 8 At this time, the potential difference between the potential measuring point A11 and the potential measuring point B12 is U ' AB Therefore, the potential difference between the potential measuring point A11 and the potential measuring point B12 is U ' ·R AB .

[0042] After that, the electric switch continues to act on the closing state until the closing is in place. Figure 8 In the state shown in the figure, due to the contact between the main contact 15 and the static contact 3, a shunt is generated, and the current between the potential measuring point A11 and the potential measuring point B12 is instantaneously changed from I to I ', the potential difference between the two also mutates. And from the generation of current I to the sudden change of current I ' The time difference between the two is the time it takes arcing contact 13 to conduct current before main contact 15. By detecting the potential change between potential measurement points A11 and B12 and collecting the time difference based on the closing speed of the electrical switch's operating mechanism, the excess travel of the arcing contact before the main contact 15 can be calculated.

[0043] Similarly, when the electrical switch moves from the closed state to the open state, the moving contact system rotates counterclockwise to Figure 8 During this period, the current between the potential measurement point A11 and the potential measurement point B12 is I ' When the moving contact system continues to rotate counterclockwise, the main contact silver point 16 and the static contact silver point 17 are disconnected, so that the current between the potential measurement point A11 and the potential measurement point B12 changes from I ' Instantaneously changes to 1. At this point, the timing starts until Figure 8 The state shown. When the moving contact system continues to rotate counterclockwise, the arc contact silver point 14 is disconnected from the grid silver point 205, and an arc is generated between the arc contact silver point 14 and the grid silver point 205, and the electrical switch enters the arc breaking process. At this time, the current I suddenly changes and enters the breaking curve, which is the end of the timing. By detecting the potential change between the potential measurement point A11 and the potential measurement point B12, the time difference between the timing start and the timing end is collected, that is, the time difference between the arc contact 13 disconnecting the current and the main contact 15 disconnecting the current. According to the opening speed of the operating mechanism of the electrical switch, the excess travel of the arc contact 13 and the main contact 15 disconnecting the current can be calculated through the time difference.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An electrical switch with an equipotential connection structure, comprising an electrical switch body (1) and an arc extinguishing system body (2), wherein a static contact (3) is installed in the electrical switch body (1), and an arc striking angle (4) is provided on the static contact (3), characterized in that: The arc extinguishing system body comprises a shell (201) having an arc extinguishing grid group (202) therein, an arc striking grid (203) is provided inside the shell (201), the arc striking grid (203) comprises a grid body (204), one end of the grid body (204) is provided with a first bent flat plate (206) located below the arc extinguishing grid at the lowest end of the arc extinguishing grid group (202), the other end of the grid body (204) is provided with a second bent flat plate (207), the end of the second bent flat plate (207) is provided with a contact plate (208) bent multiple times; the contact plate (208) is exposed outside the shell (201), and the contact plate (208) is vertically upward; The top of the electrical switch body (1) is provided with a mounting cavity (5) for vertically inserting the arc extinguishing system body (2), and the static contact (3) is provided at the bottom of the mounting cavity (5), and the arc striking angle (4) is provided on the static contact (3) in a vertically upward state, and after the arc extinguishing system body (2) is installed in the mounting cavity (5), the contact plate (208) contacts the arc striking angle (4), the contact plate (208) is provided with a screw hole (209), the arc striking angle (4) is provided with a through hole (6), and the housing of the electrical switch body (1) is provided with a mounting hole (7) corresponding to the through hole (6), and a locking bolt (8) is installed between the mounting hole (7), the through hole (6) and the screw hole (209) to connect the contact plate (208) and the arc striking angle (4) to the same potential; the arc striking angle (4) is provided with a potential measurement point A (11) and a potential measurement point B (12).

2. The electrical switch with an equipotential connection structure according to claim 1, characterized in that: The arc striking grid (203) is provided with an iron core (9) inside the bent portion of the contact plate (208).

3. The electrical switch with an equipotential connection structure according to claim 1, characterized in that: A bottom plug (10) is installed in the mounting hole (7) to seal the mounting hole (7).

4. The electrical switch with an equipotential connection structure according to claim 1, characterized in that: Positioning bolts are also installed between the electrical switch body (1) and the housing of the arc extinguishing system body (2).

5. The electrical switch with an equipotential connection structure according to claim 1, characterized in that: The potential measurement point A (11) and the potential measurement point B (12) are arranged along the current direction and are at a certain distance from each other.

6. The electrical switch with an equipotential connection structure according to claim 1, characterized in that: The second bent flat plate (207) is provided with a grid silver point (205) in contact with an arc contact (13) in the arc extinguishing system body (2).

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