CN218730514U

CN218730514U - Moving contact of electric switch and double-breakpoint rotary isolating switch

Info

Publication number: CN218730514U
Application number: CN202222643248.2U
Authority: CN
Inventors: 南添; 梁英杰; 寇籍; 苏文冉; 周彬; 南寅
Original assignee: Tianjin Svrui Intelligent Electrical Co Ltd
Current assignee: Tianjin Svrui Intelligent Electrical Co Ltd
Priority date: 2022-07-18
Filing date: 2022-10-09
Publication date: 2023-03-24
Anticipated expiration: 2032-10-09
Also published as: CN117457420A; WO2024017063A1

Abstract

The utility model discloses a moving contact of electric switch, be provided with the rotation center point on the moving contact to rotation center point reverse symmetry transmission axis y, the moving contact extends both ends from rotation center point along axis y to both sides, and both ends all are provided with as the contact electrically conductive arch of usefulness and as the protruding form that shifts electric arc and elongate electric arc usefulness and draw arc portion, arch and protruding form arc portion do not distribute in axis y's both sides, and the protruding extending direction at both ends sets up on the contrary, and the protruding form at both ends draws arc portion and contact electrically conductive protruding shape with incomplete samely. The moving contact can meet the requirement of reliably breaking the electric arc under higher rated working voltage, and the breaking capacity of the electric switch is improved.

Description

Moving contact of electric switch and double-breakpoint rotary isolating switch

Technical Field

The utility model relates to a low-voltage apparatus technical field, concretely relates to moving contact and rotatory isolator of double break point of electric switch.

Background

The switch is an electric appliance which can be used for connecting, bearing and breaking current under normal circuit condition, and also can be used for connecting, bearing and breaking current for a certain time under the defined abnormal circuit condition.

With the popularization of new energy in China, the rotary isolating switch is widely applied to power systems such as photovoltaic systems, wind power systems and the like, and the branch circuit is switched on and off by the rotary isolating switch. When the moving contact and the static contact of the isolating switch are separated, arc discharge can be generated, and the arc can have great damage effect on the moving contact and the static contact, so that the breaking performance of the rotary isolating switch is reduced. Therefore, if the arc cannot be extinguished quickly and effectively, the time for breaking the circuit is prolonged, hidden dangers are brought to the use of the isolating switch and the load equipment, and even safety accidents are possibly caused.

In a limited space, in order to meet the market demands of miniaturization and high breaking capacity, many manufacturers improve the arc extinguishing capacity by combining the mode of separating electric arcs and blowing long electric arcs by arranging an arc extinguishing chamber with the opening distance smaller than or equal to the opening distance between a moving contact and a static contact in a disconnecting switch and arranging a permanent magnet, but because the permanent magnet has directivity, the permanent magnet arranged around two end parts of the moving contact of the switch only plays a half role when passing current in the forward and reverse directions, so that the current with higher voltage cannot be broken, and the development of miniaturization and high power of large-capacity electric power equipment cannot be adapted. Therefore, a movable contact capable of transferring an arc and extending more is required.

SUMMERY OF THE UTILITY MODEL

Based on above-mentioned background, the utility model provides a moving contact and electric switch of electric switch draws the arc portion through the protruding form that sets up on the moving contact as the electrically conductive arch of usefulness of contact and as guide electric arc usefulness, bigger extension electric arc to satisfy reliable disconnected electric arc of dividing under the higher rated operating voltage, can effectively overcome at least one of above-mentioned problem.

The technical scheme of the utility model as follows:

in one aspect, the utility model provides a moving contact of electric switch, be provided with the rotation center point on the moving contact to the reverse symmetry transmission axis of rotation center point (y), the moving contact is along axis (y) to both sides extend and be certain angle conduct the electric arch of usefulness and as the protruding form that shifts and elongate electric arc usefulness of contact with axis (y) in the tip setting and draws arc portion, the tip protruding and protruding form draw the both sides that arc portion distributes at axis (y), the arch at moving contact both ends sets up in opposite direction of extension separately.

In a preferred embodiment, the convex arc-striking portions at the two ends of the movable contact are respectively arranged in opposite extending directions.

In a preferred embodiment, an angle α formed between a point on the protrusion farthest from the center point of rotation and a line connecting the center point of rotation and the axis (y) is not less than 20 ° and not more than 70 °, and an angle β formed between a point on the protrusion-like arc-inducing portion farthest from the center point of rotation and a line connecting the center point of rotation and the axis (y) is not more than 60 °. In this way, the distance between the convex conductive part of the moving contact and the convex arc-leading part is effectively controlled, and the electric arc can be more greatly elongated and effectively transferred from the convex conductive part to the convex arc-leading part.

In a preferred embodiment, when the movable contact moves rotationally around the rotation center point, the rotation radius of a point on the protrusion farthest from the rotation center point is smaller than or equal to or larger than the rotation radius of a point on the protrusion-shaped arc-striking portion farthest from the rotation center point. In this way, after the electric arc is transferred, the arc can be effectively lengthened by the convex arc ignition part, and the conductive part protruded on the movable contact is protected from being corroded by the electric arc.

In a preferred embodiment, the shape of the protrusion is one of a square shape, a circular shape, an arc shape, a trapezoid shape, a triangular shape, or any combination of two or more of the shapes.

In a preferred embodiment, the shape of the convex arc-leading part is one of square, circle, arc, trapezoid and triangle or any combination of two or more of the shapes.

In a preferred embodiment, the shapes of the protrusions and the protrusion-shaped arc ignition parts arranged at the two ends of the movable contact are the same or different.

In a preferred embodiment, the movable contact is a single movable contact blade or is formed by stacking at least two movable contact blades concentrically arranged in a rotation center point.

In a preferred embodiment, the movable contact piece includes a movable contact piece main body portion, and the protrusion-shaped arc-striking portion are disposed at an end portion of the movable contact piece main body portion.

In a preferred embodiment, the convex arc-striking portion is integrally disposed on the main body portion of the moving contact piece or the convex arc-striking portion and the main body portion of the moving contact piece are separately disposed, and the convex arc-striking portion is mechanically connected to the main body portion of the moving contact piece by riveting, welding, or fastening.

In a preferred embodiment, when the moving contact is a single moving contact blade, the two ends of the moving contact blade are both provided with the protrusions and the protrusion-shaped arc ignition portions.

In the embodiment, the movable contact rotates around the rotation center, so that the protrusions at the two ends of the movable contact are respectively inserted into the elastic openings of the conductive ends of the two independent static contacts, the conductive parts at the two ends of the movable contact and the static contacts are simultaneously contacted and disconnected, double-breakpoint disjunction is realized, and fracture disconnection voltage is well reduced. The elastic opening of the conductive end of the static contact can well clamp the conductive protrusion of the moving contact, so that the good conductive contact performance of the electric switch is ensured.

In a preferred embodiment, when the movable contact is formed by stacking a plurality of movable contact blades, both ends of each movable contact blade are provided with the protrusions, both ends of at least one movable contact blade are provided with the convex arc-leading portions, or one end of at least one of the movable contact blades is provided with the convex arc-leading portion, and the other end of at least one of the movable contact blades is provided with the convex arc-leading portion.

In a preferred embodiment, a boss or a clamping groove is arranged on the outer side of the middle part of the movable contact blade.

In a preferred embodiment, the center portion of the movable contact blade is provided with a circular, square or semicircular hole.

In a preferred embodiment, the central portion of the movable contact blade is provided with a projection or a groove perpendicular to the plane of rotation of the movable contact.

In the above embodiments, the middle portion of the moving contact blade is provided with features for defining the rotation center of the moving contact, and ensuring that the protrusion and the convex arc striking portion on the moving contact conform to the rotation path designed by us.

In a preferred embodiment, when the movable contact is composed of a plurality of movable contact blades, the protrusions at two end parts of adjacent movable contact blades have gaps, and at least one protrusion-shaped arc-striking part is positioned between two adjacent movable contact blades.

In the embodiment, the movable contact rotates around the rotation center, so that the protrusions at the two ends of the movable contact are respectively inserted into the elastic openings of the conductive ends of the static contact, the conductive parts at the two ends of the movable contact and the static contact are simultaneously contacted and disconnected, double-breakpoint breaking is realized, and the breaking voltage of a fracture is well reduced.

The gap between the bulges at the two end parts of the moving contact forms an elastic opening which is respectively matched with the conductive ends of the two independent static contacts, when the electric switch is switched on/off, the moving contact rotates to realize the simultaneous contact and disconnection of the conductive parts at the two ends of the moving contact and the static contact, the double-breakpoint disjunction is realized, and the break-break voltage of the fracture is well reduced. The elastic opening between the bulges at the two ends of the moving contact can well clamp the conductive end of the static contact, so that the good conductive contact performance of the electric switch is ensured.

In a preferred embodiment, when the movable contact is composed of a plurality of movable contact pieces, the convex arc-striking part on the movable contact piece is closed to the adjacent movable contact piece in a flat or bent manner. Can effectively narrow the electric arc, increase the electric arc voltage, accelerate the electric arc to extinguish.

In a preferred embodiment, the convex arc-leading portion is further provided with at least one convex extension extending from an outer edge of the convex arc-leading portion to a position far away from the rotation center point.

On the other hand, the utility model provides a rotatory isolator of double break point, include moving contact, insulating housing, static contact, metal grid piece stromatolite explosion chamber, operating device, the moving contact rotatably sets up in the insulating housing, the static contact is fixed in the insulating housing, the tip of static contact is provided with the electrically conductive end with protruding switch-on, the moving contact horizontal rotation makes the moving contact both ends arch respectively with the electrically conductive end simultaneous contact or the separation of two independent static contacts.

In a preferred embodiment, a gas generating insulating member is arranged between the moving contact and the arc extinguish chamber, the gas generating insulating member is arranged in parallel to the upper and lower areas of the rotating path of the convex arc striking part and the convex arc striking part at the two ends of the moving contact to form an air passage, and the width of the air passage is narrower than that of the metal grid sheet in the arc extinguish chamber.

The purpose of this embodiment is that the isolator adopts the double-break working mode, and the arc can be generated during breaking, and the arc can be narrowed by adding the gas-generating insulator, so that the arc can be extinguished quickly, and the generated inert gas can accelerate the movement of the arc and help to avoid the reignition of the arc. The arc extinguishing chamber is located protruding the place ahead to including piling up arc extinguishing bars piece like C shape or L shape, with the moving trajectory cooperation of the protruding form arc-striking portion of moving contact, can realize that electric arc shifts and lengthens, arc can effectively be cut apart to the arc extinguishing bars piece, the extinguishing of accelerating electric arc.

The utility model has the advantages as follows:

1. this application is through setting up on the moving contact with conventional structure and extending the electrically conductive arch of contact to the static contact direction to deviating from protruding one side increases the protruding form arc initiation portion that shifts the effect of striking. When moving contact and static contact turned to the separation state from the contact state, moving contact rotary motion, the radius of rotation of protruding form run-on portion is greater than bellied radius of rotation, consequently, the moving contact rotates in-process protruding form transfer run-on portion and arc extinguishing bars piece minimum distance and is less than when protruding minimum distance with the arc extinguishing bars piece, the resistance between protruding form and the arc extinguishing bars piece on the moving contact is littleer, thereby electric arc will realize from the transfer of electrically conductive arch to transferring the protruding form run-on portion of run-on, in the twinkling of an eye more greatly elongate electric arc, thereby make electric arc voltage increase fast, reach the effect that electric arc extinguishes fast, electric arc disjunction ability of electric switch under higher rated operating voltage has been promoted.

On the other hand, the arc is transferred to the convex arc-leading part from the bulge, so that the burning loss of the arc to the contact electric conduction bulge is reduced, and the service life of the switch is prolonged.

2. This application is through arc transfer technique, and the moving contact guide arc orbit is longer, can set up longer arc passageway in the periphery of moving contact movement orbit, arranges the arc extinguishing bars piece of more quantity in the arc passageway. The arc generated when the movable contact and the fixed contact are separated can be more divided by the arc extinguishing grid plate, the arc voltage is increased, the cooling speed of the arc can be accelerated, the arc is effectively prevented from overflowing to the outside of the switch, and zero arcing is realized; and shorten arc extinguishing time, promoted the security and the electric life of switch greatly.

3. According to the isolating switch, the gas generating insulating part can be additionally arranged in part or all of the electric arc area of the isolating switch for narrowing the electric arc and increasing the gas blowing effect, so that the electric arc is lengthened more quickly and longer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a movable contact according to an embodiment of the present application;

fig. 2 is a schematic diagram of an internal structure of the double-breakpoint isolation switch of the present application;

fig. 3 is a schematic diagram of a motion track of the movable contact in the double-breakpoint isolating switch according to the present application;

FIG. 4 is a schematic diagram of an arc transfer process of the movable contact of the present application in a double break point disconnector;

FIGS. 5 to 8 are other schematic structural views of the movable contact blade;

fig. 9 is a schematic view of the movable contact in fig. 5 in a contact state with the fixed contact;

fig. 10 is a schematic structural view of a movable contact according to another embodiment of the present application;

fig. 11 is a schematic view of the movable contact in fig. 10 in a contact state with the fixed contact;

fig. 12 is a schematic perspective view of a double-break isolator according to the present application;

fig. 13 is a schematic structural diagram of a movable contact module of the present application;

FIG. 14 is a schematic view of the gas generating insulator of the present application forming an air passage between the movable contact and the arc chute;

FIG. 15 is a schematic view of a riveting structure of the gas generating insulator and the insulator housing of the present application;

FIG. 16 is a schematic view of the gas generating insulator and the insulator housing of the present application;

FIG. 17 is a schematic view of a riveting structure of a gas generating insulator and an arc extinguishing chamber according to the present application;

fig. 18 is a schematic structural view of a movable contact of other embodiments disposed in a double-break isolating switch;

fig. 19 is a schematic structural view of another embodiment of a movable contact disposed in a double break point disconnector;

fig. 20 is a schematic structural view of an arc striking metal grid of an arc extinguishing chamber of the metal grid stack according to the present application, which is C-shaped;

fig. 21 is a schematic structural view of an arc striking metal grid of an arc extinguishing chamber of the metal grid stack according to the present application, which is L-shaped;

fig. 22 is another schematic structural diagram of the movable contact and the fixed contact of the present application;

fig. 23 is another schematic structural diagram of the movable contact and the stationary contact according to the present application.

Detailed Description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to perform more detailed description on the technical solution in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a moving contact of an electrical switch is provided in an embodiment of the present application, the moving contact is a single moving contact blade 100, the moving contact blade 100 includes a moving contact blade main body 103, and a protrusion 101 and a protrusion arc-inducing portion 102 that are disposed at two radial end portions of the moving contact blade main body 103, a rotation central point 11 is disposed at a central position of the moving contact blade main body 103, an axis y is respectively emitted from the rotation central point 11 in opposite directions along a radial direction of the moving contact blade 100, a boss 1031 is disposed at a middle position of the moving contact blade main body 103, and the moving contact blade main body 103 is symmetrically disposed along the axis y, that is, the bosses 1031 are disposed on two sides of the moving contact blade main body 103, and the bosses 1031 on two sides are symmetrical along the axis y; the protrusion 101 and the protrusion arc-leading portion 102 located at the same end of the movable contact blade 100 are respectively disposed at two sides of the axis y, wherein the end of the main body 103 of the protrusion 101 extends to a side away from the axis y and the extending direction is substantially perpendicular to the axis y, the end of the main body 103 of the protrusion arc-leading portion 102 extends to a direction forming an acute angle with the axis y and away from the rotation center point 11, and the protrusion 101 and the protrusion arc-leading portion 102 at the same end of the movable contact 1 are substantially V-shaped.

The protrusions 101 at the two end portions of the movable contact piece 100 and the movable contact piece main body portion 103 are integrally arranged, the convex arc-striking portions 102 at the two end portions and the movable contact piece main body portion 103 can be integrally arranged or can be separately arranged, when the movable contact piece is separately arranged, the convex arc-striking portions 102 are mechanically connected with the movable contact piece main body portion through riveting, welding, fastening and the like, when the convex arc-striking portions 102 and the movable contact piece main body portion 103 are integrally or separately arranged, the convex arc-striking portions 102 and the movable contact piece main body portion 103 can be arranged in the same plane or in different planes.

With reference to fig. 1, the protrusions 101 at two ends of the movable contact blade 100 extend in opposite directions and are oppositely disposed with respect to the axis Y, the protrusions 101 at the upper end of the movable contact blade 100 extend backward from the main body of the movable contact blade, and the protrusions 101 at the lower end extend forward from the main body of the movable contact blade, in this embodiment, the extending direction of the protrusions 101 is substantially perpendicular to the axis Y, the protrusions 101 are rectangular, the ends of the protrusions 101 are provided with chamfers, the chamfers of the protrusions 101 at two ends of the movable contact 1 are disposed at a corner away from the rotation center point 11, and the upper and lower surfaces of the protrusions 101 contact or separate from the conductive end of the stationary contact of the switch.

It should be noted that the extending direction of the protrusion 101 may also be set to form an acute angle or an obtuse angle with the axis y, the extending direction of the protrusion 101 is not limited to the application, and the shape of the protrusion 101 is not limited to the rectangle with the cut angle in the embodiment, and may also be one of a circle, an arc, a trapezoid, and a triangle, or a combination of the two shapes.

With reference to fig. 1, the extending directions of the convex arc-leading portions 102 at the two end portions of the moving contact piece 100 are opposite, and the structural shapes of the convex arc-leading portions 102 at the two end portions may be the same or different, wherein the convex arc-leading portion 102 at the upper end extends forward and upward from the main body portion of the moving contact piece, the convex arc-leading portion 102 at the lower end extends backward and downward from the main body portion of the moving contact piece, and the extending direction of the convex arc-leading portion 102 forms an acute angle with the axis y. In this embodiment, the convex arc-striking portion 102 is tapered, and the size of the convex arc-striking portion 102 gradually decreases from the movable contact blade main body portion to the end portion. So that the arc can be concentrated in a small area or even at a certain point.

In a preferred embodiment, referring to fig. 1, the convex arc portion 102 may further include at least one convex extension 104 extending from an outer edge of the convex arc portion 102 to a position away from the rotation center point 11, and a length of a farthest point of the convex extension 104 from the rotation center point 11 and the rotation center point 11 is greater, so as to facilitate arc elongation.

An included angle alpha between a connection line of a point on the bulge 101, which is farthest from the rotating center 11, and the rotating center 11 and an axis y is not less than 20 degrees and not more than 70 degrees, and an included angle beta between a connection line of a point on the bulge-shaped arc-leading portion 102, which is farthest from the rotating center 11, and the rotating center 11 and the axis y is not more than 60 degrees.

In this embodiment, the included angle α > β, and in other embodiments, the included angle α may be smaller than the included angle β or both angles may be equal, as long as both the included angle α and the included angle β satisfy the above-mentioned range.

The distance from the farthest point to the rotation central point 11 on the protrusion 101 at the same end of the moving contact 1 is smaller than the distance from the farthest point to the rotation central point 11 on the protrusion arc-leading portion 102, so that when the moving contact 1 rotates around the rotation central point 11, the rotation radius of the farthest point to the rotation central point 11 on the protrusion 101 is smaller than the rotation radius of the farthest point to the rotation central point 11 on the protrusion arc-leading portion 102. When the moving contact 1 rotates around the central point 11, the arc striking part 102 is closer to the arc extinguishing grid piece arranged above the moving contact than the protrusion 101, and the purpose of arc transfer is achieved.

Referring to fig. 2, the present embodiment further discloses an electric switch, which is a double-breakpoint rotary isolating switch. The rotary isolating switch can be applied to an alternating current circuit or a direct current circuit, and the number of the contact modules can be configured correspondingly according to the requirement.

The double-breakpoint rotary isolating switch comprises an insulating shell 2, an operating mechanism 5, a moving contact module 30, a static contact 3 and an arc extinguish chamber 4, wherein the moving contact module 30 comprises a transfer part 301 and a moving contact 1, the insulating shell 2 is provided with a peripheral seat which is concentrically matched with the circular moving contact module 30, the moving contact module 30 is located in the peripheral seat at the middle part of the insulating shell 2 and can freely rotate, the moving contact 1 is fixedly clamped in the transfer part 301 through a boss 1031, so that the rotating center 11 of the moving contact 1 is coincided with the circle center of the transfer part 301, and the transfer part 301 drives the moving contact 1 to rotate together. The fixed contacts 3 are fixed on the peripheral seat, one rotatable moving contact 1 corresponds to the two fixed contacts 3, and the operating mechanism 5 drives the moving contact module 30 to rotate around the rotation central point 11, so that the upper and lower surfaces of the protrusions 101 at the two ends of the moving contact 1 are respectively contacted with or separated from the upper and lower surfaces of the conductive end on the corresponding fixed contact. Specific contact patterns can refer to fig. 9 and 11, but are not limited to the contact patterns of fig. 9 and 11.

The arc extinguishing chamber 4 is arranged at the periphery of the motion tracks at the two ends of the moving contact, stacked arc extinguishing grid pieces are arranged in the arc extinguishing chamber, and the arrangement shape of the arc extinguishing grid pieces is similar to a C shape or an L shape. The arc extinguishing device is used for being matched with the moving contact to realize arc transfer and fast arc extinguishing.

Referring to fig. 3, in the present application, by providing a convex arc-guiding portion 102 extending away from a protrusion 101 on a moving contact, since a distance from a rotation center point 11 on the convex arc-guiding portion 102 is greater than a distance from a farthest point from the rotation center point 11 on the protrusion 101, a moving trajectory of a farthest point 102a from the rotation center point 11 on the convex arc-guiding portion 102 is greater than a moving trajectory of a farthest point 101a from the rotation center point 11 on the protrusion 101, and a difference between a moving trajectory length of the convex arc-guiding portion 102 and a moving trajectory length of the protrusion 101 plus a length between the farthest point 101a on the protrusion 101 and a farthest point 102a on the convex arc-guiding portion 102 is an arc elongation length increased by the provision of the convex arc-guiding portion 102.

Referring to fig. 4, the arc extinguishing chamber 4 is composed of a plurality of arc extinguishing grid pieces, one fixed contact is correspondingly provided with a group of arc extinguishing grid pieces, the group of arc extinguishing grid pieces are sequentially arranged in a C shape or an L shape along the rotation direction of the movable contact 1, when the movable contact 1 is separated from the fixed contact 3, an arc is generated between the protrusion 101 on the movable contact 1 and the fixed contact 3, when the movable contact 1 rotates to the position shown in the figure, the length K between the farthest point 102a on the protrusion arc-leading portion 102 from the rotation center point 11 and the arc extinguishing grid piece is smaller than the length L between the farthest point 101a on the protrusion 101 from the rotation center point 11 and the arc extinguishing grid piece, at this time, the resistance between the protrusion arc-leading portion 102 and the arc extinguishing grid piece is smaller, the arc is transferred from the protrusion 101 to the protrusion arc-leading portion 102, the arc is instantly elongated, so that the arc voltage is rapidly increased, and the arc is continuously rotated after the arc is transferred from the protrusion 101 to the protrusion 102, the arc-leading portion 102 is completely extinguished, and the arc-extinguishing effect is achieved, and the arc-extinguishing effect is prevented from being damaged, and the arc-extinguishing switch is used for a long time.

In this embodiment, the movable contact 1 is fixed to the transferring member 301 through a protrusion 1031, a recess portion matching with the protrusion 1031 is disposed on the transferring member 301 to achieve connection therebetween, and a rotation center point 11 of the movable contact 1 coincides with a central axis of the transferring member 301.

In other embodiments, as shown in fig. 5, two sides of the middle position of the movable contact blade main body portion 103 are provided with clamping grooves 1031', the clamping grooves 1031' on the two sides are symmetrically arranged with respect to the axis y, correspondingly, the transfer member 301 is provided with a latch cooperating with the clamping grooves 1031', and the movable contact 1 is fixed on the transfer member 301 through the clamping of the clamping grooves 1031' and the latch.

In another embodiment, as shown in fig. 6, the movable contact 1 may be mounted on the transfer member 301 by opening a hole 14 at the rotation center point 11 of the movable contact piece main body portion 103, and providing a fixed column on the transfer member 301, wherein the hole 14 on the movable contact 1 penetrates the fixed column on the transfer member 301; as shown in fig. 7 and 8, the movable contact blade 100 may be rotatably mounted on the insulating housing 2 or the transfer member 301 of the insulating housing 2 through the recess 16 or the protrusion 15 by forming the recess 16 or the protrusion 15 at the central position of the movable contact blade main body portion 103.

Fig. 9 is a schematic view of a moving contact and a stationary contact formed by a single moving contact blade 100, where protrusions 101 at two ends of the moving contact are respectively in contact with the corresponding stationary contact, the stationary contact 3 is formed by two stationary contact blades, and the protrusions 101 are inserted between the two stationary contact blades to achieve the contact conduction between the moving contact and the stationary contact.

The application still discloses another kind of specific embodiment by the movable contact structure that a plurality of movable contact blades are constituteed, please refer to fig. 10, movable contact 1 is folded from top to bottom by two movable contact blades 100 and is established and form, and two movable contact blades 100's rotation central point 11 sets up with the heart, has gapped stack from top to bottom for two movable contact blade 100's movable contact blade main part 103, two movable contact blade 100's protruding 101 shape size is the same, and has gapped stack from top to bottom, two in this embodiment movable contact blade 100 assembles when together, and movable contact blade main part and protruding 101 are the same and coincide on transfer 301.

In this embodiment, the two ends of the two movable contact blades 100 are both provided with the convex-shaped arc-leading portions 102, the size and the shape of the convex-shaped arc-leading portions 102 on the two movable contact blades 100 are the same, and when the two movable contact blades 100 are assembled together, the projections of the convex-shaped arc-leading portions 102 on the two ends of the two movable contact blades 100 on the transfer member 301 are the same and coincide.

Specifically, when the two movable contact blades 100 are assembled, the two movable contact blades 100 are stacked, and the convex arc-leading portions 102 are folded towards the gap direction between the two movable contact blades 100 in a flat or bent manner, so that the two convex arc-leading portions 102 at the same end of the two movable contact blades 100 are located between the two movable contact blades 100 in the stacking direction, and the two convex arc-leading portions 102 at the same end of the two movable contact blades 100 are contacted and conducted.

It should be noted that, this embodiment is exemplified by only stacking two moving contact pieces to form a moving contact, and the number of the moving contact pieces is not limited herein, and a moving contact formed by stacking a plurality of moving contact pieces may also be formed by moving contact pieces more than two pieces, for example, three moving contact pieces may be stacked up and down to form a moving contact, a gap is provided between three moving contact pieces, or four or five moving contact pieces may be stacked up and down to form a moving contact, and the number of the moving contact pieces may be reasonably set according to the actual switch structure.

In the moving contact structure that a plurality of moving contact pieces constitute, a plurality of both ends that move the contact piece all are provided with the clearance between protruding and the adjacent arch, wherein the both ends that are located the moving contact piece main part of the moving contact piece of stack direction of height department set up protruding form and draw forth arc portion, the both ends that other move the contact piece are unable to set up protruding form and draw forth arc portion, the contact of the moving contact piece main part of a plurality of moving contact pieces is electrically conductive, so that electric arc in a plurality of archs transmits protruding form and draws forth arc portion through moving contact piece main part.

The movable contact is formed by a plurality of movable contact pieces, and the two end parts of the movable contact are provided with the convex arc-striking parts only after the plurality of movable contact pieces are assembled together, namely the convex arc-striking parts at the two end parts of the movable contact can be arranged on the same movable contact piece or can be arranged on two different movable contact pieces; the quantity of the convex arc-leading parts at the two end parts of the moving contact is not limited, the convex arc-leading parts can be arranged on each moving contact piece, or the convex arc-leading parts can be arranged on partial moving contact pieces, and the arc-leading parts can be arranged at the two ends of the moving contact as long as the moving contact pieces are overlapped and assembled.

The fixing manner, the working principle and the effect of the moving contact 1 formed by the double-acting contact blade 100 and the insulating shell or the transferring member 301 on the insulating shell are the same as those of the above embodiments, and are not described herein again.

Fig. 11 is a schematic diagram of a contact state between a moving contact structure formed by double moving contact blades and a fixed contact, where protrusions 101 at two ends of the moving contact are respectively in contact with corresponding fixed contacts, the fixed contact 3 is a single fixed contact blade, and an end of the fixed contact blade is inserted between the protrusions 101 of two moving contact blades of the moving contact, so as to achieve contact conduction between the moving contact and the fixed contact.

Fig. 12 shows a double-breakpoint isolation switch, in which the moving contact module 30 can rotate clockwise or counterclockwise by rotating the operating handle 5, so as to achieve the switching-on and switching-off functions of the moving contact 1 and the static contact 3.

Referring to fig. 13, in the present embodiment, the movable contact module 30 includes a movable contact 1 and a transfer component 301, the transfer component 301 is formed by an upper insulating component 3011 and a lower insulating component 3012, and the movable contact 1 is fixed between the upper insulating component 3011 and the lower insulating component 3012, but the movable contact module 30 is not limited to the combination shown in the present embodiment.

Referring to fig. 14, an air duct 7 is formed between the moving contact module 30 and the arc extinguish chamber 4, at least one side of two sides of the air duct 7 is provided with a gas generating insulating member 6, the gas generating insulating member 6 is parallel to upper and lower regions of a rotation path of a protrusion and a convex arc striking portion at two ends of the moving contact, a width H2 of the air duct 7 is smaller than a width H1 of a metal grid sheet in the arc extinguish chamber 4, in this embodiment, the width H2 of the air duct 7 is also smaller than a width H3 of a gap between the upper insulating member 3011 and the lower insulating member 3012, in other embodiments, H2 may be greater than or equal to H3. So that the electric arc generated when the moving contact 1 is separated from the static contact 3 enters the air airway 7 more quickly, the width H2 of the air airway 7 is smaller than the width H1 of the metal grid in the arc extinguish chamber 4, so that an air pressure difference is formed between the arc extinguish chamber 4 and the air airway 7, the diameter of the electric arc is favorably compressed, the electric arc is accelerated to move to the arc extinguish chamber, and the electric arc is accelerated to extinguish.

With continued reference to fig. 14, the protrusion 101 and the convex arc-leading portion 102 of the movable contact 1 may be partially or completely wrapped by the air duct 7 formed by the gas-generating insulator 6, and the rotation path of the protrusion 101 and the convex arc-leading portion 102 may also be partially or completely wrapped by the air duct 7.

Referring to fig. 15, 16 and 17, the gas generating insulator 6 may be an independent body, and is fixed to the bottom of the arc extinguish chamber 4, or fixed to the insulating housing 2, or integrally disposed on the insulating housing 2, by riveting, concave-convex fitting, hole-site fitting, clamping, welding, or the like.

Specifically, the insulating housing 2 comprises an upper housing and a lower housing, and as shown in fig. 15, the gas-generating insulating member 6 is respectively assembled with the upper housing and the lower housing by a convex-concave fit; as shown in fig. 16, the gas-generating insulator 6 is integrally provided with the upper case and the lower case, respectively; as shown in fig. 17, the gas generating insulator 6 is mounted on the arc extinguishing chamber 4 by male-female fitting.

Fig. 18 is a schematic structural diagram of a movable contact in another embodiment, which is disposed in a double-break-point disconnecting switch, and the movable contact in this embodiment is different from the movable contact in the above embodiments in that: the distance of the farthest point 102a of the convex arc-striking portion 102 from the rotation center point 11 is equal to the distance of the farthest point of the protrusion 101 from the rotation center point 11. When the moving contact rotates to the point 102a, farthest from the rotating central point 11, on the convex arc-leading portion 102, and is closest to an arc-extinguishing grid piece of the arc-extinguishing chamber, the electric arc is transferred from the protrusion 101 to the convex arc-leading portion 102, and the electric arc is instantly elongated, so that the electric arc voltage is rapidly increased.

Similarly, in the schematic structural diagram of the movable contact structure of another specific embodiment shown in fig. 19, which is disposed in the double-breakpoint isolating switch, the movable contact in this embodiment is different from the movable contact structure in the above embodiment in that: the distance of the farthest point 102a from the rotation center point 11 on the convex arc-striking portion 102 is smaller than the distance of the farthest point 101a from the rotation center point 11 on the protrusion 101. When the moving contact rotates to the point 102a, farthest from the rotating central point 11, on the convex arc-leading portion 102, and is closest to an arc-extinguishing grid piece of the arc-extinguishing chamber, the electric arc is transferred from the protrusion 101 to the convex arc-leading portion 102, and the electric arc is instantly elongated, so that the electric arc voltage is rapidly increased.

Fig. 20 is a schematic structural diagram that an arc striking metal grid plate of an arc extinguishing chamber of a metal grid plate lamination of the present application is C-shaped, as shown in fig. 20, a C-shaped arc striking metal grid plate is disposed at one end of the arc extinguishing chamber of the metal grid plate lamination close to a fixed contact, the C-shaped arc striking metal grid plate includes a first section parallel to the fixed contact and adjacent to or closely adjacent to the fixed contact, a third section substantially parallel to or having a small included angle with the arc extinguishing grid plate adjacent to the arc striking metal grid plate, and a second section connected between the first section and the third section, and the first section, the second section, and the third section are connected to form a C shape.

It should be noted that the C-shaped arc striking metal grid can also be disposed at an end of the arc extinguishing chamber of the metal grid lamination, which is far away from the stationary contact, and can be flexibly adjusted according to product requirements.

Fig. 21 is a schematic structural diagram that an arc striking metal grid plate of an arc extinguishing chamber of a metal grid plate lamination is L-shaped, as shown in fig. 21, an L-shaped arc striking metal grid plate is arranged at one end, close to a fixed contact, of the arc extinguishing chamber of the metal grid plate lamination, the L-shaped arc striking metal grid plate includes a fourth section parallel to the fixed contact and adjacent to or closely adjacent to the fixed contact, and a fifth section approximately parallel to or having a small included angle with the arc extinguishing grid plate adjacent to the arc striking metal grid plate, and the fourth section and the fifth section are connected to form an L shape.

It should be noted that the L-shaped arc striking metal grid can also be disposed at an end of the arc extinguishing chamber of the metal grid lamination, which is far away from the stationary contact, and can be flexibly adjusted according to product requirements.

In other embodiments, the arc striking metal grid sheet adjacent to one end of the fixed contact and the fixed contact can also be arranged at an acute angle, and when the arc striking metal grid sheet is in a C shape, a section of the arc striking metal grid sheet adjacent to the fixed contact and the fixed contact are arranged at an acute angle; when the arc striking metal grid sheet is L-shaped, a section of the arc striking metal grid sheet close to the static contact is arranged at an acute angle with the static contact.

Fig. 22 is another schematic structural diagram of the movable contact and the stationary contact according to the present application, and compared with the movable contact and the stationary contact shown in fig. 21, the length of the protrusion at the end of the movable contact in this embodiment is shorter, and correspondingly, the length of the stationary contact matched with the movable contact is longer, so as to achieve the contact or separation between the movable contact and the stationary contact.

Fig. 23 is another schematic structural diagram of a moving contact and a stationary contact according to the present application, in this embodiment, a size of a convex arc-striking portion of the moving contact is reduced, and accordingly, a structure of the stationary contact is also changed, and when the stationary contact is in contact with the moving contact, an extending direction of the stationary contact is substantially parallel to an extending direction of a main body portion of the moving contact.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A moving contact of an electric switch is characterized in that a rotating central point is arranged on the moving contact, an axis y is symmetrically emitted in a reverse direction of the rotating central point, the moving contact extends towards two sides along the axis y and is provided with a protrusion which forms a certain angle with the axis y and is used for contact conduction and a protrusion arc-leading part which is used for transferring and lengthening electric arcs, the protrusion and the protrusion arc-leading part at the end part are distributed at two sides of the axis y, and the protrusions at two ends of the moving contact are arranged in opposite extending directions respectively.

2. A movable contact according to claim 1, wherein the convex arc-striking portions at the two ends of the movable contact extend in opposite directions.

3. The movable contact according to claim 1, wherein an angle α formed between a line connecting a point on the protrusion farthest from the rotation center point and the axis y is not less than 20 ° and not more than 70 °, and an angle β formed between a line connecting a point on the protrusion-like arc-inducing portion farthest from the rotation center point and the axis y is not more than 60 °.

4. The movable contact according to claim 1, wherein when the movable contact performs a rotational motion about the rotational center point, a rotational radius of a point on the protrusion farthest from the rotational center point is smaller than or equal to or greater than a rotational radius of a point on the protrusion-shaped arc-initiating portion farthest from the rotational center point.

5. The movable contact of claim 1 wherein the shape of the protrusion is one or any combination of two or more of a square, a circle, an arc, a trapezoid, and a triangle.

6. The movable contact according to claim 1, wherein the shape of the convex arc-striking portion is one of a square shape, a circular shape, an arc shape, a trapezoid shape, a triangular shape, or any combination of two or more of the shapes.

7. The movable contact according to claim 1, wherein the protrusions and the protrusion-shaped arcing portions provided at both ends of the movable contact have the same or different structural shapes.

8. The movable contact according to claim 1, wherein the movable contact is a single movable contact blade or a stack of at least two movable contact blades concentrically arranged with respect to a rotation center point.

9. The movable contact of claim 8 wherein said movable contact piece includes a movable contact piece body portion and said protrusion arc initiation portion disposed at an end of said movable contact piece body portion.

10. The movable contact according to claim 9, wherein the convex arc-striking portion is integrally disposed on the main body portion of the movable contact strip or the convex arc-striking portion and the main body portion of the movable contact strip are separately disposed, and the convex arc-striking portion is mechanically connected to the main body portion of the movable contact strip by riveting, welding, or fastening.

11. The movable contact according to claim 9, wherein when the movable contact is a single movable contact blade, both ends of the movable contact blade are provided with the protrusions and the protrusion-shaped arc-striking portions.

12. The movable contact according to claim 9, wherein when the movable contact is formed by stacking a plurality of movable contact blades, both ends of each movable contact blade are provided with the protrusions, both ends of at least one movable contact blade are provided with the convex arc-striking portions, or one end of at least one of the movable contact blades is provided with the convex arc-striking portion, and the other end of at least one of the movable contact blades is provided with the convex arc-striking portion.

13. The movable contact according to claim 9, wherein the movable contact blade is provided with a boss or a slot at the outer side of the middle portion thereof.

14. A movable contact according to claim 9, wherein the central portion of the movable contact blade is provided with a circular, square or semicircular aperture.

15. A movable contact according to claim 9, wherein the central portion of the movable contact blade is provided with a projection or a groove perpendicular to the rotation plane of the movable contact.

16. The movable contact according to claim 9 wherein when said movable contact is composed of a plurality of movable contact blades, there is a gap between the protrusions at the two ends of adjacent movable contact blades, and at least one of said protrusion-like arc-inducing portions is located between two adjacent movable contact blades.

17. A movable contact according to claim 16, wherein the convex arc-striking portion of a part of the movable contact blade is bent or flattened toward the adjacent movable contact blade.

18. The movable contact of claim 1 wherein said convex arcing portion further comprises at least one convex extension extending from an outer edge of said convex arcing portion away from said center point of rotation.

19. A double-breakpoint rotary isolating switch, characterized in that it comprises a moving contact according to any one of claims 1 to 18, an insulating housing, a fixed contact, an arc extinguish chamber with laminated metal grids, and an operating mechanism, wherein the moving contact is rotatably disposed in the insulating housing, the fixed contact is fixed in the insulating housing, the end of the fixed contact is provided with a conductive end connected with a protrusion, and the moving contact horizontally rotates to make the protrusions at both ends of the moving contact respectively contact with or separate from the conductive ends of two independent fixed contacts.

20. The double-breakpoint rotary isolating switch of claim 19, wherein a gas generating insulating member is disposed between the moving contact and the arc extinguish chamber, the gas generating insulating member is disposed parallel to upper and lower regions of a rotation path of the protrusion and the convex arc striking portion at two ends of the moving contact to form an air passage, and a width of the air passage is narrower than a width of the metal grid in the arc extinguish chamber.

21. The double-breakpoint rotary isolating switch according to claim 19, wherein at least one end portion of the arc extinguishing chamber of the metal grid sheet lamination, which is close to the fixed contact or far from the fixed contact, is provided with an arc striking metal grid sheet.

22. The double-breakpoint rotary isolating switch of claim 21, wherein the arc striking metal grid piece adjacent to one end of the fixed contact is arranged at an acute angle with respect to the fixed contact.

23. A double break rotary disconnector according to claim 19 or 20 or 21 or 22, characterized in that the arc extinguishing chamber of the stack of metal grids, with or without ignition metal grids, has an L or C shape.

24. The double-breakpoint rotary isolating switch of claim 21 or 22, wherein the arc striking metal grid is L-shaped or C-shaped in shape.