WO2024017044A1 - Switch unit, isolating switch and power supply system - Google Patents

Abstract

The present application relates to the technical field of electric switches. Disclosed are a switch unit, an isolating switch and a power supply system. The switch unit comprises a shell, a moving contact arranged in the shell, a moving contact support, a fixed contact, and an arc extinguishing chamber corresponding to the fixed contact, wherein the moving contact can be connected to the fixed contact in an inserted manner; an electric arc guide surface is formed on the fixed contact; the fixed contact is connected to an arc introduction sheet; the electric arc guide surface is connected to one side surface of the arc introduction sheet to form an arc introduction surface; and the arc introduction surface extends to one side of the arc extinguishing chamber, so that an electric arc generated at the fixed contact is introduced into the arc extinguishing chamber by means of the arc introduction surface. The arc introduction effect can be improved, thereby improving the arc extinguishing capability of the isolating switch.

Description

Switch unit, isolation switch and power supply system

Cross-references to related applications

This application requires the priority of the Chinese patent application with application number 202210874483.2 and titled "A switch unit, isolating switch and power supply system" submitted to the State Intellectual Property Office of China on July 21, 2022, and requires priority on July 2022. The priority of the Chinese patent application with application number 202221998655.9 and titled "A switch unit, isolating switch and power supply system" submitted to the State Intellectual Property Office of China on March 29, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of isolating switches, specifically, to a switch unit, isolating switch and power supply system.

Background technique

Rotary isolating switches in the related art are usually stacked by several switch units. Each switch unit includes a housing. Each housing is equipped with corresponding moving contacts and static contacts. The static contacts are installed in the housing. The external terminals extend to the outside of the housing. The middle part of the housing is rotated with a movable contact turret for installation on the moving contacts. The external terminals of the static contacts extend to the outside of the housing. Each moving contact is composed of two moving contact pieces. Two movable contacts are paired and arranged oppositely on the movable contact mounting frame. There is a matching gap between the pairs of movable contacts for the insertion of static contacts. There is a drive between each housing to drive each movable contact to rotate. The axis core of the frame rotates synchronously, so that the movable contact piece and the static contact head form a contact, conduction, separation and disconnection relationship.

When the movable contact and the static contact are separated, an arc will be generated. The arc will not only cause great damage to the contacts, but also prolong the time for disconnecting the circuit, causing hidden dangers to the use of the isolating switch, so it is often An arc extinguishing chamber will be set up in each switch unit to extinguish the arc, so how to quickly introduce the arc into the arc extinguishing chamber becomes very important, especially the introduction of the arc root at the static contact is the most critical. Currently, there are some static The contact arc ignition structure is often difficult to realize the rapid transfer of the arc root, causing the arc to always burn on the static contact, causing serious burn damage to the static contact. At the same time, the arc cannot quickly enter the arc extinguishing chamber, and the actual effect of the arc extinguishing chamber is difficult to exert. come out.

In addition, the isolating switch plays two roles in the power system: one is the control role, that is, according to the operation needs of the power system, a part of the power equipment or lines is put into or out of operation; the other is the protection role, that is, when the power equipment or lines occur When a fault occurs, the faulty part is quickly removed from the power system to ensure the normal operation of the fault-free part of the power system.

In related technologies, an arc extinguishing chamber is usually configured in the isolating switch for arc extinguishing. Since the tip of the movable contact needs to extend into the arc extinguishing chamber, in order to ensure smooth installation, the movable contact and the arc extinguishing chamber are usually assembled together first. , and then the whole assembly consisting of the movable contact and the arc extinguishing chamber is installed into the housing, which is not conducive to the mechanized installation of the movable contact and the arc extinguishing chamber.

Contents of the invention

One aspect of the present application provides a switch unit, an isolating switch and a power supply system, which can improve the arc ignition effect, thereby improving the arc extinguishing capability of the isolating switch.

According to some exemplary embodiments of an aspect of the present application, a switch unit is provided. The switch unit may include a housing, a movable contact disposed in the housing, a movable contact bracket, a fixed contact, and the The arc extinguishing chamber corresponding to the static contact, the movable contact can be plugged into the static contact, an arc guide surface is formed on the static contact, an arc ignition piece is connected to the static contact, and The arc guide surface and one side of the arc ignition piece are connected to form an arc ignition surface, and the arc ignition surface extends to one side of the arc extinguishing chamber, so that the arc generated at the static contact passes through the arc ignition surface. The surface is introduced into the arc extinguishing chamber.

Optionally, as an implementable manner, the housing may be a rectangular housing, the static contacts include two, and both ends of the movable contact are respectively plugged into the two static contacts, The static contact includes a connection section and an extension section that are connected to each other. The connection section cooperates with the housing and extends outside the housing to achieve electrical connection with external electrical equipment. The extension section faces the location inside the housing. The arc extinguishing chamber is configured, the end of the extension section is used to cooperate with the movable contact, and the connection line between the two static contacts and the movable contact overlaps with the length direction of the rectangular housing. The included angle is in the range of 15°-65°.

Optionally, as an implementable manner, the end of the extension section may also be formed with an arc-generating fillet or arc-generating fillet connected to the arc guide surface. Obtuse arc angle.

Optionally, as an implementable manner, the arc-starting piece may be a V-shaped folding plate, one V-shaped arm of the V-shaped folding plate is connected to the extension section, and the other part of the V-shaped folding plate is connected to the extending section. A V-shaped arm is disposed toward the arc extinguishing chamber.

Optionally, as an implementable manner, a V-shaped arm of the arc ignition blade facing the arc extinguishing chamber may include a guide section and a bending section connected to each other, and the bending section is located on the arc extinguishing chamber. On one side of the chamber, the bending section is arranged parallel or approximately parallel to the arc extinguishing grid in the arc extinguishing chamber close to the bending section.

Optionally, as an implementable manner, the side surface of the guide section facing the arc extinguishing chamber and the arc guide surface can be connected to form a flat surface or an arc surface, or the guide section can be connected towards the arc extinguishing chamber. One side surface of the arc extinguishing chamber can be connected to the arc guide surface, and the connection angle is between 150° and 180°.

Optionally, as an implementable manner, a magnetization block may also be provided in the V-shaped area formed by the static contact and the arc striking piece, and the magnetization block is used to increase the arc blowing force to increase the arc blowing force. The arc is blown towards the arc extinguishing chamber.

Optionally, as an implementable manner, the magnetization block may include a first connecting arm and a second connecting arm arranged in a V shape, the first connecting arm corresponding to the extension section, and the The second connecting arm is arranged corresponding to a V-shaped arm of the arc ignition piece facing the arc extinguishing chamber.

Optionally, as an implementable manner, the magnetization block may include a first magnetization section and a second magnetization section connected to each other, and the first magnetization section has a magnetic field parallel to or approximately parallel to the guide section. A parallel first magnetizing surface, the second magnetizing section has a second magnetizing surface that is parallel or approximately parallel to the bent section.

Optionally, as an implementable manner, the magnetization block may be in a U-shaped structure, and the arc-starting blade is disposed on both sides of the U-shaped structure toward a V-shaped arm of the arc extinguishing chamber. between.

According to other exemplary embodiments of an aspect of the present application, an isolating switch is also provided. The isolating switch may include a plurality of switch units according to an aspect of the present application arranged in a stack, and is connected to the switch unit. An operating mechanism is provided with an operating handle.

Optionally, as an implementable manner, the portion of the connecting section of each fixed contact extending out of the housing may be staggered along the stacking direction of the switch unit.

According to further exemplary embodiments of an aspect of the present application, a power supply system is also provided. The power supply system may include: a DC source, a power conversion unit, and an isolation switch according to an aspect of the present application. The isolation switch It is connected between the DC source and the power conversion unit, and is opened by operating the isolation switch when the DC source or the power conversion unit fails.

The beneficial effects of the above-mentioned embodiments of an aspect of the present application include at least:

The switch unit, isolation switch and power supply system provided by this application include a casing, a movable contact arranged in the casing, a movable contact bracket, a static contact, and an arc extinguishing chamber corresponding to the static contact. The movable contact can Plug-in with the static contact, an arc guide surface is formed on the static contact, an arc ignition piece is connected to the static contact, and the arc guide surface and one side of the arc ignition piece are connected to form an arc ignition surface, and the arc ignition surface extends to the extinguishing point One side of the arc chamber, so that the arc generated at the static contact is introduced into the arc extinguishing chamber through the arc striking surface, ensuring that the arc can be stably transmitted from the static contact to the arc extinguishing chamber, thus improving the arc striking effect of the switch unit. By ensuring The arc can smoothly enter the arc extinguishing chamber so that the arc extinguishing chamber can extinguish the arc, thereby improving the arc extinguishing capability of the isolating switch.

Another aspect of the application provides a switch unit, isolating switch and power supply system, which can help realize the mechanized installation of movable contacts and arc extinguishing chambers.

According to some exemplary embodiments of another aspect of the present application, a switch unit is provided, which may include a base, a static contact and an arc extinguishing chamber respectively fixedly disposed in the base, and a movable contact rotatably disposed in the base. The contact and the upper cover are provided with a relief groove on the base, and an opening is provided on one side of the relief groove close to the arc extinguishing chamber. The end of the movable contact can be located in the relief groove. and rotate and slide into the arc extinguishing chamber through the opening. The upper cover is provided with a blocking block corresponding to the relief slot. The upper cover is assembled and connected with the base, and the blocking block is plugged into the arc extinguishing chamber. in the said giving way.

Optionally, the movable contact may include a movable contact bracket and a movable contact busbar fixedly provided on the movable contact bracket, and the movable contact The bracket rotates relative to the base, so that the end of the movable contact busbar cooperates with the opening and closing of the static contact.

Optionally, the stationary contact, the arc extinguishing chamber, the relief groove and the blocking block may each include two, and the opposite ends of the movable contact busbar are respectively provided with plug-in parts. The two static contacts, the two arc extinguishing chambers, the two plug-in parts, the two relief slots and the two blocking blocks are all along the geometric center of the movable contact bracket. Set up centrally symmetrically.

Optionally, along the installation surface perpendicular to the assembly direction of the base and the upper cover, the movable contact bracket and two relief grooves and two seals located on opposite sides of the movable contact bracket The block can separate the unit housing formed by the assembly of the base and the upper cover into two mutually independent installation cavities.

Optionally, the movable contact bracket may be provided with two openings, and the two plug-in parts respectively extend out of the movable contact bracket through the corresponding openings, along the movable contact In the circumferential direction of the bracket, the arc length of the movable contact bracket located between the two openings is longer than that of the side of the relief slot close to the arc extinguishing chamber and the stationary contact close to the arc extinguishing chamber. The arc length of the moving contact bracket between one side of the arc chamber.

Optionally, the base and the upper cover may be respectively provided with a first sub-accommodating groove and a second sub-accommodating groove, and the first sub-accommodating groove and the second sub-accommodating groove are jointly formed for accommodating The accommodating groove of the moving contact bracket is concentrically accommodated in the accommodating groove.

Optionally, the movable contact can rotate relative to the base to form a rotation path that matches the opening and closing of the static contact, and the static contact and the arc extinguishing chamber are respectively located outside the rotation path, And the static contact is located on the side of the arc extinguishing chamber away from the relief slot.

Optionally, the shape of the blocking block may be adapted to the shape of the relief groove.

Other exemplary embodiments of another aspect of the application also provide an isolation switch, which may include a handle, an operating mechanism, and a switch unit according to another aspect of the application, the number of switch units being It includes a plurality of switch units, and a plurality of switch units are stacked in sequence. The handle is drivingly connected to the movable contact of each switch unit through the operating mechanism. The handle is used to drive the operating mechanism to rotate to drive multiple switches. The moving contacts of each of the switch units rotate synchronously.

Some embodiments of another aspect of the application also provide a power supply system. The power supply system may include a DC source, a power conversion unit, and an isolation switch according to another aspect of the application. The isolation switch is connected to Between the DC source and the power conversion unit, opening is achieved by operating the isolation switch when the DC source or the power conversion unit fails.

The beneficial effects of the above embodiments of another aspect of the present application include at least:

The switch unit includes a base, a static contact and an arc extinguishing chamber respectively fixedly installed in the base, a movable contact rotatingly installed in the base, and an upper cover. The base is provided with a relief groove, and the relief groove is close to the arc extinction chamber. There is an opening on one side of the opening, and the end of the moving contact can be located in the relief slot and rotated through the opening to slide into the arc extinguishing chamber. The upper cover is provided with a blocking block corresponding to the relief slot. The upper cover is assembled and connected with the base, and the sealing The blocking block is inserted into the relief groove. In the actual production and manufacturing process, the static contact and arc extinguishing chamber can be fixedly installed in the base through a robot first, so that the static contact, arc extinguishing chamber and base can be assembled together first. At this time, the static contact can be realized and mechanized installation of the arc extinguishing chamber, and then use the manipulator to align the end of the movable contact with the relief groove of the base, and move the movable contact toward the side close to the base and push it into the relief groove. , can realize the mechanized installation of the movable contact, and then use the manipulator to rotate the movable contact toward the side close to the static contact, so that the end of the movable contact rotates through the opening and slides into the arc extinguishing chamber. At this time, it can be exposed Make way for the fixed installation of the upper cover. Finally, use a manipulator to align the blocking block of the upper cover with the giving slot of the base, and move the upper cover toward the side closer to the base to achieve assembly connection with the base. At this time, the blocking block can be inserted into the relief groove to close the opening, thereby preventing the arc generated between the movable contact and the stationary contact from flowing into the relief groove through the opening or even flowing to other positions of the base, thereby preventing the arc from flowing into the relief groove or even to other positions of the base. Under the premise of affecting the sealing, it can effectively improve the feasibility of mechanized installation of static contacts, arc extinguishing chambers and moving contacts.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a switch unit provided by an embodiment of the present application;

Figure 2 is a second structural schematic diagram of a switch unit provided by an embodiment of the present application;

Figure 3 is one of the structural schematic diagrams of the static contacts, arc striking pieces and magnetizing blocks in the switch unit provided by an embodiment of the present application;

Figure 4 is the second structural schematic diagram of the static contact, arc striking piece and magnetizing block in the switch unit provided by the embodiment of the present application;

Figure 5 is the third structural schematic diagram of the static contact, arc striking piece and magnetizing block in the switch unit provided by the embodiment of the present application;

Figure 6 is an exploded schematic diagram of a switch unit provided by another embodiment of the present application;

Figure 7 is a schematic structural diagram of the base of a switch unit provided by another embodiment of the present application;

Figure 8 is a schematic assembly diagram of the base, static contacts, arc extinguishing chamber and movable contacts of the switch unit provided by another embodiment of the present application;

Figure 9 is a schematic structural diagram of an upper cover of a switch unit provided by another embodiment of the present application;

Figure 10 is a schematic cross-sectional view of a switch unit provided by another embodiment of the present application;

Figure 11 is a second schematic cross-sectional view of a switch unit provided by another embodiment of the present application;

Figure 12 is a schematic structural diagram of an arc extinguishing chamber of a switch unit provided by another embodiment of the present application;

Figure 13 is a schematic structural diagram of an isolation switch provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of an isolation switch provided by another embodiment of the present application; and

FIG. 15 is a schematic structural diagram of a stacked arrangement of multiple switch units in an isolation switch according to an embodiment of the present application.

Icon: 100, 100'-switch unit; 110, 110'-casing (or base); 111'-buffer slot; 112'-first installation slot; 113'-second installation slot; 114'-first Sub-containing groove; 115'-exhaust channel; 1151'-guide block; 120, 120'-static contact; 121-connection section; 122-extension section; 123-arc guide surface; 124-connection part; 130, 130'-arc extinguishing chamber; 131'-gas production plate; 132'-grid piece; 140-arc striking piece; 141-guide section; 142-bending section; 150-magnetization block; 151-first connecting arm; 152-the second connecting arm; 153-the first magnetizing section; 154-the second magnetizing section; 160, 160'-moving contact; 161, 161'-moving contact bracket; 162'-moving contact busbar; 163'-plugging part; 170'-upper cover; 171'-blocking block; 172'-second sub-accommodating groove; 180'-unit shell; 181'-installation cavity; 200, 200'-isolating switch; 210, 210' - operating mechanism; 220, 220' - operating handle; a ₁ , a ₂ - arc length; b - rotation path.

Detailed ways

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship where the product of this application is commonly placed when used. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply. The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application. In addition, the terms "first", "second", etc. are only used to differentiate descriptions and are not to be understood as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", etc. do not mean that the component is required to be absolutely horizontal or suspended, but may be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical". It does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the description of this application, it should also be noted that, unless otherwise clearly stated and limited, the terms "setting", "installation", "connecting" and "connecting" should be understood in a broad sense. For example, it can be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood on a case-by-case basis.

First, referring to Figures 1 and 3, one aspect of the present application provides a switch unit 100, which may include a housing (also called a base) 110, a movable contact disposed in the housing 110, a movable contact bracket, a static The contact 120, and the arc extinguishing chamber 130 corresponding to the static contact 120, the movable contact can be plugged into the static contact, the static contact 120 is formed with an arc guide surface 123, and the static contact 120 is connected with an arc ignition piece 140, and the arc guide surface 123 and one side of the arc ignition piece 140 are connected to form an arc ignition surface, which extends to one side of the arc extinguishing chamber 130, so that the arc generated at the static contact 120 is introduced and extinguished through the arc ignition surface. Inside the arc chamber 130.

Specifically, the arc ignition piece 140 is connected to the static contact 120, and the arc guide surface 123 is connected to one side of the arc ignition piece 140 to form an arc starting surface, which is equivalent to extending the arc guide surface 123 on the static contact 120 to the arc extinguishing point. Chamber 130 to prevent the arc from stagnating at the arc guide surface on the static contact 120, causing the static contact 120 to be burned and damaged, so as to ensure the arc ignition and arc extinguishing effect of the switch unit 100. Among them, the arc guide surface 123 and the arc ignition blade The arc striking surface formed by connecting one side of 140 can be a flat surface or a large obtuse angle surface to ensure that the arc smoothly enters the arc extinguishing chamber 130 through the arc striking surface. For example, the large obtuse angle surface can be set to 165°, 168°, 170° or 172°.

The switch unit 100 provided by this application may include a housing 110, a moving contact 160 disposed in the housing 110, a moving contact bracket 161, a static contact 120, and an arc extinguishing chamber 130 corresponding to the static contact 120. The movable contact 160 can be plugged into the static contact 120. The static contact 120 is formed with an arc guide surface 123. The static contact 120 is connected with an arc ignition piece 140, and the arc guide surface 123 and one side of the arc ignition piece 140 The connection forms an arc striking surface, which extends to one side of the arc extinguishing chamber 130 so that the arc generated at the static contact 120 is introduced into the arc extinguishing chamber 130 through the arc striking surface, ensuring that the arc can be stably conducted from the static contact 120 to the arc extinguishing chamber 130, thereby improving the arc ignition effect of the switch unit 100. By ensuring that the arc can smoothly enter the arc extinguishing chamber 130, the arc extinguishing chamber 130 can extinguish the arc, thereby improving the arc extinguishing capability of the isolating switch.

In a possible embodiment of the present application, as shown in FIG. 2 , the housing 110 may be a rectangular housing 110 , the static contacts 120 include two, and both ends of the movable contact 160 are plugged into the two static contacts 120 respectively. , the static contact 120 includes an interconnected connecting section 121 and an extending section 122. The connecting section 121 cooperates with the housing 110 and extends outside the housing 110 to achieve electrical connection with external electrical equipment. The extending section 122 faces inside the housing 110 The arc extinguishing chamber 130 is set up, and the end of the extension section 122 is used to cooperate with the movable contact. The angle between the overlap between the two static contacts and the movable contact and the length direction of the rectangular housing 110 is in the range of 15°-65°. .

Specifically, the angle between the overlapping connection between the two static contacts 120 and the moving contact 160 and the length direction of the rectangular housing 110 is the α angle in Figure 2. When the α angle is less than 15°, the movable contact 160 is opened. The position can be farther, and the grid plate arrangement position is larger, but the arc ignition piece 140 is too tilted, and the arc ignition effect is not good; when the α angle is greater than 65°, the arc ignition piece 140 is very gentle, and the arc ignition is very good, but the dynamic contact The maximum opening position of the head 160 becomes closer, and the space for grid arrangement in the arc extinguishing chamber 130 becomes smaller. Setting the α angle in the range of 15°-65° can not only make the connection between the static contact 120 and the arc ignition piece 140 easier It is smooth and easy to start an arc, and can ensure that the space of the arc extinguishing chamber 130 is enlarged to arrange more grids. At this time, the arc generated when the moving contact and the static contact 120 are separated can be directed to the rectangular housing 110 One corner of the arc extinguishing chamber 130 is moved. On this basis, the arc extinguishing chamber 130 is set to extend to both sides along the width direction of the rectangular housing 110. By increasing the setting range of the arc extinguishing chamber 130, the arc is allowed to flow within the arc extinguishing chamber 130. It has a long moving path, thereby ensuring the arc extinguishing capability of the switch unit 100 . The extension section 122 can be arranged to extend toward the arc extinguishing chamber 130 at a preset angle with the width direction of the housing 110 , or it can first extend a preset distance along the width direction of the housing 110 and then extend along the width direction of the housing 110 with the housing 110 . The width direction extends toward the arc extinguishing chamber 130 at a preset angle, ensuring that the angle between the line connecting the end of the extension section 122 and the geometric center of the housing 110 and the length direction of the rectangular housing 110 is within the range of 15°-65°. .

Furthermore, the extension section 122 of the stationary contact 120 may also include a plurality of sub-extension sections extending in different directions or angles, so as to be closer to the movement path of the movable contact 160 . It can be understood that the extension section 122 of the stationary contact 120 can also be a straight sub-extension section and one or more bent sub-extension sections.

In a possible embodiment of the present application, as shown in FIG. 3 , the end of the extension section 122 may also be formed with an arc-generating fillet or an arc-generating obtuse angle connected to the arc guide surface 123 .

Specifically, when the end of the extension section 122 has a sharp angle, part of the arc generated when the movable contact and the stationary contact 120 are separated will flow along the side of the stationary contact 120 away from the arc extinguishing chamber 130 , and this part of the arc will This brings hidden dangers to the use of the switch unit 100. The sharp-angled end of the extension section 122 is difficult to guide the arc and causes the arc to stay at the end of the extension section 122 for a long time, causing burns at the end of the extension section 122 and causing the movable contact 160 to be unable to be inserted. smooth, or lead to unsatisfactory contact between the moving and static contacts. At this time, the end of the extension section 122 is set to a rounded or obtuse angle, so as to increase the contact area between the end of the extension section 122 and the moving contact, and produce arc fillets. Or the obtuse angle of arc generation can more easily guide the arc to the arc guide surface 123, and then guide the arc to the arc starting piece 140 through the arc guide surface 123, so that the arc can enter the arc extinguishing chamber 130, wherein the arc generation obtuse angle can be set to 120°-160°.

In a possible embodiment of the present application, as shown in Figures 1 and 3, the arc starting piece 140 can be a V-shaped folding plate. A V-shaped arm of the V-shaped folding plate is connected to the extension section 122. The V-shaped folding plate The other V-shaped arm is disposed toward the arc extinguishing chamber 130 .

Specifically, the arc-starting blade 140 is arranged in a V-shape. A V-shaped arm of the arc-starting blade 140 facing the arc extinguishing chamber 130 will not have a large bending angle with the arc guide surface 123, so that the arc passes through the arc guide surface 123. When the arc striker 140 and the arc striker 140 are connected, the arc will not jump and stop on the arc striker surface, causing burns to the static contact 120 or the arc striker 140. On the other hand, when arranged in a V-shape, the arc striker 140 can deflect the arc. Guided to the bottom of the rectangular housing 110 , the setting range of the arc extinguishing chamber 130 can extend to both sides along the width direction of the rectangular housing 110 to ensure the arc extinguishing capability of the arc extinguishing chamber 130 .

In a possible embodiment of the present application, as shown in FIGS. 1 and 3 , a V-shaped arm of the arc ignition blade 140 facing the arc extinguishing chamber 130 may include a guide section 141 and a bending section 142 connected to each other. The segment 142 is located on one side of the arc extinguishing chamber 130 , and the bending segment 142 is parallel or approximately parallel to the arc extinguishing grid in the arc extinguishing chamber 130 close to the bending segment 142 .

Specifically, a bending section 142 is provided at one end of the arc ignition piece 140 facing the arc extinguishing chamber 130, and the bending section 142 is arranged parallel or approximately parallel to the arc extinguishing grid piece in the arc extinguishing chamber 130 close to the bending section 142. At this time, The arc root can enter the arc extinguishing chamber 130 more smoothly through the arc striking surface on the bending section 142 and be cut off by the arc extinguishing grids arranged at intervals.

In a possible embodiment of the present application, as shown in FIGS. 1 and 3 , the static contact 120 can be integrally formed with the arc ignition piece 140 .

Specifically, the static contact 120 and the arc-starting piece 140 are integrally arranged, that is, the extension section 122 of the static contact 120 is a V-shaped arm of the V-shaped structure, and the arc-starting piece 140 is another V-shaped arm of the V-shaped structure. At this time, the arc guiding surface 123 of the static contact 120 and one side of the arc striking piece 140 are connected to each other and there is no gap on the arc striking surface, which can better ensure the conduction of the arc on the arc striking surface. On the other hand, by connecting the static contact The contact 120 and the arc ignition piece 140 are integrally provided to facilitate the assembly of the static contact 120 and the arc ignition piece 140 on the housing 110, thereby improving the assembly and production efficiency of the isolating switch and saving production costs.

In a possible embodiment of the present application, as shown in Figures 1 and 3, the side surface of the guide section 141 facing the arc extinguishing chamber 130 and the arc guide surface 123 can be connected to form a flat surface or an arc surface, or the guide section The side surface of 141 facing the arc extinguishing chamber 130 is connected with the arc guide surface 123, and the connection angle is between 150° and 180°. The arc starting surface formed by connecting the arc guide surface 123 and the guide section 141 is relatively smooth to ensure that the arc smoothly enters the arc extinguishing chamber 130 through the arc starting surface.

In a possible embodiment of the present application, as shown in FIGS. 1 and 3 , a magnetizing block 150 may also be provided in the V-shaped area formed by the static contact 120 and the arc striking piece 140 . The magnetizing block 150 is used for The arc blowing force is increased to blow the arc toward the arc extinguishing chamber 130 .

Specifically, when the moving contact and the static contact 120 are separated, the current flows in the direction from the static contact 120 to the arc starting piece 140, and from the arc starting piece 140 to the moving contact through the arc. According to Ampere's rule, It can be seen that the magnetic induction intensity in the V-shaped area is vertical to the mounting surface of the housing 110, and the magnetic induction intensity outside the V-shaped area is vertical to the mounting surface of the housing 110. According to the left-hand rule, under the action of the magnetic induction intensity of the arc perpendicular to the paper surface outward, Due to the Lorentz force moving horizontally to the right, the arc is elongated due to the arc blowing force, and at the same time, the arc transfer along the arc striking surface toward the arc extinguishing chamber 130 is accelerated. At this time, the magnetizing block 150 is arranged in the V-shaped area, which increases the magnetic induction intensity in the V-shaped area. At the same time, the magnetic induction intensity outside the V-shaped area is also correspondingly enhanced, thereby increasing the arc blowing force and further accelerating the arc along the ignition direction. The arc surface moves toward the arc extinguishing chamber 130 . It should be noted that when the current flows in the reverse direction, the magnetic blowing force received by the arc is still directed toward the arc extinguishing chamber 130 to ensure the arc extinguishing capability of the arc extinguishing chamber 130 .

In a possible embodiment of the present application, as shown in FIG. 3 , the magnetizing block 150 may include a first connecting arm 151 and a second connecting arm 152 arranged in a V shape. The first connecting arm 151 is connected to the extension section 122 . Correspondingly, the second connecting arm 152 is disposed corresponding to a V-shaped arm of the arc ignition piece 140 facing the arc extinguishing chamber 130 .

Specifically, on the basis of the V-shaped area formed by the static contact 120 and the arc ignition piece 140, the magnetizing block 150 is also arranged in a V-shaped structure, the first connecting arm 151 is corresponding to the extension section 122, and the second connecting arm 151 is arranged in a V-shaped structure. The connecting arm 152 is arranged corresponding to a V-shaped arm of the arc ignition piece 140 facing the arc extinguishing chamber 130. When the V-shaped arm of the arc starting blade 140 facing the arc extinguishing chamber 130 is a straight arm, the second connecting arm 152 is also configured as a straight arm to further accelerate the transfer of the arc along the arc starting surface toward the arc extinguishing chamber 130 .

When the arc starting blade 140 faces a V-shaped arm of the arc extinguishing chamber 130 and includes a guide section 141 and a bending section 142, the second connecting arm 152 is also provided with a corresponding bending section to increase the arc blowing force and further accelerate the arc along its path. The arc starting surface moves toward the arc extinguishing chamber 130 .

In a possible embodiment of the present application, as shown in FIG. 4 , the magnetization block may include a first magnetization section 153 and a second magnetization section 154 that are connected to each other. The first magnetization section 153 has a connection with the guide section 141 The second magnetization section 154 has a parallel or approximately parallel first magnetization surface and a second magnetization surface that is parallel or approximately parallel to the bent section 142 .

Specifically, the housing 110 is provided with a slot for placing the magnetization block 150. The side of the first magnetization section 153 facing the guide section 141 is the first magnetization surface, and the first magnetization surface is opposite to the arc-initiating surface of the guide section 141. Parallel, the side of the second magnetization section 154 facing the bending section 142 is the second magnetization surface, and the second magnetization surface is parallel to the arc striking surface of the bending section 142 to increase the magnetic induction intensity and accelerate the arc along the arc striking surface. The transfer speed facing toward the arc extinguishing chamber 130.

In a possible embodiment of the present application, as shown in FIG. 5 , the magnetizing block 150 can be in a U-shaped structure, and the arc ignition piece 140 is disposed on both sides of the U-shaped structure toward a V-shaped arm of the arc extinguishing chamber 130 between.

Specifically, when the magnetizing block 150 corresponds to the arc igniting piece 140, the magnetizing block 150 only corresponds to one side of the arc igniting piece 140; and when the magnetizing block 150 has a U-shaped structure, the magnetizing block 150 It includes a bottom plate and correspondingly arranged two side plates. The bottom plate and two side plates cover three sides of the arc ignition piece 140. At this time, the magnetic induction intensity formed by the magnetizing block 150 covered on three sides is higher than that formed by the magnetizing block 150 covered on one side. The magnetic induction intensity is greater, and the arc blowing force on the arc is greater, which is more conducive to the transfer of the arc to the arc extinguishing chamber 130 along the arc starting piece 140.

As shown in FIGS. 6 to 11 , another aspect of the present application provides a switch unit 100 ′, which may include a base (also referred to as a housing) 110 ′ and static contacts 120 respectively fixedly provided in the base 110 ′. ' and the arc extinguishing chamber 130', the movable contact 160' that is rotated in the base 110', and the upper cover 170'. The base 110' is provided with a relief slot 111', and the relief groove 111' is close to the arc extinguishing chamber 130 ' is provided with an opening on one side, and the end of the movable contact 160' can be located in the relief groove 111' and rotate and slide into the arc extinguishing chamber 130' through the opening. The upper cover 170' is provided with a corresponding relief groove 111'. The blocking block 171', the upper cover 170' and the base 110' are assembled and connected, and the blocking block 171' is inserted into the relief groove 111'. For example, in this embodiment, the base 110' and the upper cover 170' are arranged oppositely, so that after the base 110' and the upper cover 170' are close to each other for assembly and connection, they can be formed by the base 110' and the upper cover 170'. The unit housing 180' is used to accommodate the stationary contact 120', the arc extinguishing chamber 130' and the movable contact 160'.

In the actual manufacturing process, the static contact 120' and the arc extinguishing chamber 130' can be fixedly installed in the base 110' respectively through a robot, so that the static contact 120', the arc extinguishing chamber 130' and the base 110' are first Assembled together, at this time, the mechanized installation of the static contact 120' and the arc extinguishing chamber 130' can be realized, and then the end of the moving contact 160' is aligned with the relief groove 111' of the base 110' through a manipulator. , and move the movable contact 160' toward the side close to the base 110' and push it into the relief groove 111'. At this time, the mechanized installation of the movable contact 160' can be realized, and then the movable contact 160' is moved by the robot. Rotate toward the side close to the stationary contact 120', so that the end of the movable contact 160' rotates through the opening and slides into the arc extinguishing chamber 130'. At this time, the relief groove 111' can be exposed for the upper cover 170' Finally, the manipulator is used to align the blocking block 171' of the upper cover 170' with the relief groove 111' of the base 110', and move the upper cover 170' toward the side close to the base 110' to align with the The base 110' is assembled and connected. At this time, the blocking block 171' is inserted into the relief slot 111' to close the opening, thereby preventing the arc generated between the movable contact 160' and the stationary contact 120' from flowing in through the opening. The flow in the relief groove 111' can even flow to other positions of the base 110', which can effectively improve the feasibility of mechanized installation of the static contacts 120', arc extinguishing chamber 130' and movable contacts 160' without affecting the sealing performance. sex.

It is worth noting that in the actual manufacturing process, as for the actual angle at which the movable contact 160' is rotated by the robot toward the side close to the stationary contact 120', those skilled in the art should be able to make reasonable selections and adjustments based on the actual situation. The design only needs to make the relief groove 111' fully exposed for the fixed installation of the upper cover 170'. In actual use, the maximum stroke that the end of the movable contact 160' can move toward the side close to the stationary contact 120' should be such that the end of the movable contact 160' can move with the end of the stationary contact 120'. Reasonable selection and design are based on the effective contact of the ends to achieve closing. The maximum stroke that the end of the movable contact 160' can rotate towards the side away from the static contact 120' should be based on the end of the movable contact 160'. Make a reasonable selection based on the fact that the side of the blocking block 171' close to the end of the blocking block 171' will not collide with the end of the blocking block 171' close to the movable contact 160'. Select and design to avoid the blocking block 171' from affecting the opening and closing actions of the moving contact 160' and the static contact 120'.

Regarding the actual shapes of the relief groove 111' and the blocking block 171', those skilled in the art should be able to determine the actual shapes and arrangements of the static contacts 120', arc extinguishing chambers 130' and movable contacts 160' in the base 110'. According to the situation, reasonable selection and design only need to be made so that the actual shapes of the relief groove 111' and the blocking block 171' can adapt to each other, and there are no specific restrictions here. In addition, along the assembly direction of the base 110' and the upper cover 170', given the actual height of the opening of the slot 111', those skilled in the art should be able to determine the actual height of the arc extinguishing chamber 130' and the movable contact 160' in the base 110' Proper selection and design only require that the end of the movable contact 160' can rotate and slide into the arc extinguishing chamber 130' through the opening without colliding with the arc extinguishing chamber 130'. There is no specific restriction here.

As shown in Figures 6 to 11, in this embodiment, the movable contact 160' may include a movable contact bracket 161' and a movable contact bus bar 162' fixedly provided on the movable contact bracket 161'. The bracket 161' rotates relative to the base 110', so that the end of the movable contact bus 162' cooperates with the static contact 120' to open and close. Specifically, when the moving contact bracket 161' rotates relative to the base 110' toward the side away from the static contact 120', it can drive the moving contact bus 162' to rotate synchronously to cooperate with the static contact 120' to achieve opening. When the contact bracket 161' rotates relative to the base 110' toward the side close to the static contact 120', it can drive the movable contact bus 162' to rotate synchronously to cooperate with the static contact 120' to achieve closing.

The actual number of contact mechanisms built into each switch unit 100' can be set to one, two, three or more. Depending on the number, the corresponding number can enable the connected circuit to be disconnected when it is disconnected. To form single breakpoint, double breakpoint, triple breakpoint or multiple breakpoints, those skilled in the art should be able to make reasonable selection and design based on the actual situation, as long as the switch unit 100' can meet the actual needs of the connected circuit. Yes, there are no specific restrictions here. For example, as shown in Figures 6 to 11, in this embodiment, each of the static contacts 120' and the arc extinguishing chamber 130' includes two, and the opposite ends of the movable contact bus 162' are respectively provided with plugs. The connecting portion 163', the two static contacts 120', the two arc extinguishing chambers 130' and the two plug-in parts 163' are all centrally symmetrically arranged along the geometric center of the movable contact bracket 161', so that one of them is plugged in. The plug-in part 163' cooperates with the static contact 120' located on one side of the base 110', and the other plug-in part 163' cooperates with the static contact 120' located on the other side of the base 110', thereby forming a double breakpoint structure.

For example, the moving contact bracket 161' may include two sub-brackets that interlock with each other to clamp and fix the moving contact busbar 162' between the two sub-brackets. When the actual number of contact mechanisms built into each switch unit 100' includes two, in order to ensure the smooth installation of the movable contact bus 162', the relief groove 111' and the blocking block 171' should also include two, and The two plug-in parts 163' are adapted to each other, and the two relief grooves 111' and the two blocking blocks 171' are centrally symmetrically arranged along the geometric center of the moving contact bracket 161'.

Through the above design, the switch unit 100' provided by the embodiment of the present application has a mounting surface perpendicular to the assembly direction of the base 110' and the upper cover 170', the moving contact bracket 161' and the two sides located on the opposite sides of the moving contact bracket 161'. Two relief grooves 111' and two blocking blocks 171' can separate the unit housing 180' formed by the assembly of the base 110' and the upper cover 170' into two mutually independent installation cavities 181', so that the two contacts The head mechanism and the corresponding arc extinguishing chamber 130' can be installed in the two installation cavities 181' respectively. In this way, the arc generated by the opening and closing of the plug-in part 163' of the movable contact busbar 162' of one of the contact mechanisms and the corresponding static contact 120' can be quickly and smoothly introduced into the movable contact busbar 162 The plug-in part 163' and the static contact 120' are located in the arc extinguishing chamber 130' in the same installation cavity 181'. The plug-in part 163' of the movable contact bus 162' of another contact mechanism is connected to the corresponding static contact. The arc generated by the opening and closing of the contact 120' can be quickly and smoothly introduced into the arc extinguishing chamber 130' of the plug-in part 163' of the movable contact bus 162' and the static contact 120' located in the same installation cavity 181'. , thereby avoiding mutual interference between the two contact mechanisms.

Specifically, the moving contact bracket 161' may be provided with two openings, and the two plug-in parts 163' respectively extend out of the moving contact bracket 161' through the corresponding openings, along the circumferential direction of the moving contact bracket 161'. , the arc length a ₁ of the movable contact bracket 161' located between the two openings is greater than the side of the relief groove 111' close to the arc extinguishing chamber 130' and the side of the static contact 120' close to the arc extinguishing chamber 130'. The arc length a ₂ of the movable contact bracket 161' between the two sides is to ensure that the movable contact bracket 161' and the movable contact busbar 162' fixedly arranged on the movable contact bracket 161' jointly form the movable contact 160' At the same time, it can also avoid the dynamic contact of one of the contact mechanisms when the movable contact bracket 161' drives the plug-in part 163' of the movable contact bus 162' to cooperate with the static contact 120' to open and close. The arc generated by the opening and closing of the plug portion 163' of the head busbar 162' and the corresponding static contact 120' passes through the gap between the movable contact bracket 161' and the relief slot 111' and/or the movable contact bracket 161' The gap between the fixed contact 120' and the fixed contact 120' flows into the installation cavity 181' where the other contact mechanism is located.

In addition, the relief groove 111' and the blocking block 171' located on one side of the moving contact bracket 161' are integrated, and the relief groove 111' and the blocking block are located on the other side of the moving contact bracket 161'. The entirety of 171' should extend as far as possible toward the side close to the peripheral wall of the movable contact bracket 161', On the premise of ensuring that the opening and closing action of the movable contact bracket 161' driving the movable contact busbar 162' and the opening and closing of the static contact 120' are not affected, the relief slot 111' and the sealing area are minimized. Block the gap between the integral side wall composed of the block 171' and the peripheral wall of the adjacent moving contact bracket 161', thereby further improving the sealing performance of the two independent installation cavities 181'.

In this embodiment, the base 110' and the upper cover 170' may be respectively provided with a first sub-accommodating groove 114' and a second sub-accommodating groove 172'. The first sub-accommodating groove 114' and the second sub-accommodating groove 172' Together, they form a receiving groove for accommodating the moving contact bracket 161', and the moving contact bracket 161' is concentrically accommodated in the receiving groove. In this way, when the base 110' and the upper cover 170' are assembled and connected, the first sub-accommodating groove 114' and the second sub-accommodating groove 172' can cooperate with each other and jointly move the contact bracket 161' along the base 110' and The upper cover 170' is limited in the assembly direction and the installation direction perpendicular to the assembly direction.

In this embodiment, the movable contact 160' can rotate relative to the base 110' to form a rotation path b that matches the opening and closing of the static contact 120'. The static contact 120' and the arc extinguishing chamber 130' are respectively located on the rotation path b. outside, and the static contact 120' is located on the side of the arc extinguishing chamber 130' away from the relief groove 111'. Among them, the static contact 120' needs to include a part located on the rotation path b' formed by the movable contact 160' (or the plug-in part 163' of the movable contact bus 162') in order to realize the movable contact 160'. and the opening and closing action of the static contact 120'.

As shown in Figures 6 to 11, in this embodiment, the base 110' can be provided with a first installation groove 112' and a second installation groove 113' respectively, and the static contact 120' is accommodated in the first installation groove 112 ', the arc extinguishing chamber 130' is accommodated in the second installation groove 113', and the second installation groove 113' is located between the first installation groove 112' and the relief groove 111'. During the opening and closing process of the movable contact 160' and the static contact 120', the rotation path b formed by the movable contact 160' is actually located in an arc formed with the geometric center of the movable contact bracket 161' as the center. shape path. To this end, in the design process of the first installation groove 112', the second installation groove 113', the first sub-accommodation groove 114' (or accommodation groove) and the relief groove 111', the first step should be followed. The installation groove 112', the second installation groove 113' and the relief groove 111' are respectively arranged on an arc path formed with the geometric center of the first sub-accommodating groove 114' (or the accommodation groove) as the center. It ensures the accuracy and reliability of the opening and closing actions of the movable contact 160' and the stationary contact 120', and also ensures that the arc generated between the movable contact 160' and the stationary contact 120' can be smoothly introduced into the arc extinguishing chamber. Arc extinguishing within 130'.

As shown in FIGS. 6 , 8 , 10 and 12 , in this embodiment, the arc extinguishing chamber 130 ′ may include two gas generating plates 131 ′ arranged oppositely and spaced apart, and a connection between the two gas generating plates 131 ′. A plurality of grid pieces 132' are formed between the two gas generating plates 131' to form a rotation channel for the end of the movable contact 160' to pass through. The plurality of grid pieces 132' are arranged at intervals, and two adjacent ones are An arc ignition path is formed between the grid plates 132', and the arc generated between the movable contact 160' and the stationary contact 120' flows into the arc ignition path. As the name implies, the material of the gas generating plate 131' should be a material that can generate gas, so that the air flow that can be used for air blowing and arc extinguishing is generated through the gas generating plate 131', so that the moving contact 160' and the static contact can be connected during the opening and closing process. The arc generated between the contacts 120' can be introduced into the arc path under the action of air flow for arc extinguishing.

Further, as shown in Figures 6 to 10, in this embodiment, the base 110' may be provided with an exhaust channel 115', and the exhaust channel 115' is located in the arc extinguishing chamber 130' away from the movable contact 160' and the static contactor 160'. One side of the contact 120', and the exhaust channel 115' is connected with the arc ignition channel to quickly discharge the arc particles and high-temperature gas generated by the arc extinguishing chamber 130' out of the base 110', which is conducive to the rapid extinguishing of the arc.

As shown in Figures 6 to 10, in this embodiment, a guide block 1151' may be provided in the exhaust channel 115', and the guide block 1151' is used to guide the air flow. As for the specific shape of the guide block 1151', those skilled in the art should be able to make a reasonable selection and design based on the actual shape of the exhaust channel 115'. There is no specific restriction here, as long as the guide block 1151' can make the exhaust channel The airflow in 115' is guided to the outside of the base 110', and at the same time, the backflow phenomenon of the airflow at the outlet of the exhaust channel 115' can be avoided.

Some embodiments of the present application also disclose an isolating switch 200. Please refer to Figures 13 and 15. The isolating switch 200 may include a plurality of stacked switch units 100 according to one aspect of the present application, and a switch unit 100 is connected to the operating mechanism 210, and the operating mechanism 210 is provided with an operating handle 220.

In a possible embodiment of the present application, as shown in FIG. 15 , the portion of the connecting section 121 of each stationary contact 120 that protrudes from the housing 110 can be staggered along the stacking direction of the switch unit 100 .

Specifically, the part of the connecting section 121 of the static contact 120 extending out of the housing 110 is the wiring portion 124. When the wiring portions 124 on two adjacent switch units 100 are arranged at the same position relative to the housing 110, the two adjacent switch units 100 will The electrical gap between the wiring portions 124 on the switch unit 100 is small and can easily It is easy to break down. In this application, the wiring portions 124 are staggered to increase the electrical gap and prevent breakdown voltage from damaging the wiring portion 124 to ensure the stable use of the isolating switch 200 .

For example, the position of the wiring portion 124 on the housing 110 can be changed by lengthening the connecting section 121 of the static contact 120, and the wiring portion 124 on a housing 110 can be provided at one end of the housing 110 in the length direction. The wiring portion 124 on the adjacent housing 110 is arranged at the other end of the length direction of the housing 110. At this time, the distance between the wiring portion 124 on the two adjacent housings 110 is the largest, which can better ensure the working stability of the isolation switch 200.

Other embodiments of the present application also provide an isolating switch 200'. Referring to Figure 14, it may include a handle 220', an operating mechanism 210' and a switch unit 100', so as to drive the operating mechanism 210' to rotate through the handle 220'. The opening and closing actions of the switch unit 100' are controlled, thereby improving the accuracy and reliability of the opening and closing actions of the switch unit 100'. In the actual production and manufacturing process, the handle 220' can be provided on one side of the operating mechanism 210', the switch unit 100' can be fixedly provided on the other side of the operating mechanism 210', and the gap between the operating mechanism 210' and the switch unit 100' The fixing method may be a detachable connection or a non-detachable connection. For example, the detachable connection may be screw connection, snap connection, splicing, etc.

As shown in Figure 14, when the number of switch units 100' includes multiple, multiple switch units 100' are stacked in sequence, and each switch unit 100' is built with an independent contact mechanism (each contact mechanism includes a three movable contacts 160' and one fixed contact 120'), so that each switch unit 100' can be connected to a circuit and perform on-off control of the circuit to which it is connected. In the process of the handle 220' controlling the opening and closing action of the switch unit 100' through the operating mechanism 210', the operating mechanism 210' needs to be drivingly connected to the movable contact 160' of each switch unit 100' to pass the handle 220 'The driving operating mechanism 210' rotates to drive the movable contacts 160' of multiple switch units 100' to rotate synchronously, thereby achieving consistency in the opening and closing states of each switch unit 100', that is, under the control of the operating mechanism 210', All switch units 100' are in the open state at the same time, or all switch units 100' are in the closed state at the same time. Regarding the actual number of switch units 100', those skilled in the art should be able to make reasonable selection and design based on actual conditions, as long as the switch unit 100' can meet the actual needs of the connected circuit, for example, the switch unit 100' It can be set to 4, 6, 8, 10 or 12, etc. There are no specific restrictions here.

Some further embodiments of the present application also disclose a power supply system, which may include: a DC source, a power conversion unit, and the isolation switches 200 and 200' in the aforementioned embodiments. The isolation switches 200 and 200' are connected between the DC source and the power conversion unit. Between units, when the DC source or power conversion unit fails, the isolation switch 200, 200' is operated to realize opening, thereby ensuring the normal use of the power supply system and improving the safety performance of the power supply system.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Industrial applicability

This application discloses a switch unit, an isolation switch and a power supply system, and relates to the technical field of electrical switches. The switch unit includes a shell, a movable contact arranged in the shell, a movable contact bracket, a static contact, and an arc extinguishing chamber corresponding to the static contact. The movable contact can be plugged into the static contact, and the static contact An arc guide surface is formed on the top of the arc extinguisher, and an arc strike piece is connected to the static contact. The arc guide surface and one side of the arc strike piece are connected to form an arc strike surface. The arc strike surface extends to one side of the arc extinguishing chamber so that the static contact The arc generated at the head is introduced into the arc extinguishing chamber through the arc striking surface, which can improve the arc striking effect and thereby improve the arc extinguishing capability of the isolating switch.

In addition, it can be understood that the switch unit, isolating switch and power supply system of the present application are reproducible and can be applied in a variety of applications. For example, the switch unit, isolation switch and power supply system of the present application can be applied to the field of electrical switching technology, etc.

Claims (22)

1. A switch unit, which includes a housing, a movable contact arranged in the housing, a movable contact bracket, a static contact, and an arc extinguishing chamber corresponding to the static contact, and the movable contact can Plug-in with the static contact, an arc guide surface is formed on the static contact, an arc ignition piece is connected to the static contact, and the arc guide surface is connected to one side of the arc ignition piece to form An arc starting surface extends to one side of the arc extinguishing chamber, so that the arc generated at the stationary contact is introduced into the arc extinguishing chamber through the arc starting surface.
2. The switch unit according to claim 1, wherein the housing is a rectangular housing, the static contacts include two, and both ends of the movable contact are respectively plugged into the two static contacts, so The static contact at least includes an interconnected connecting section and an extending section. The connecting section cooperates with the housing and extends outside the housing to achieve electrical connection with external electrical equipment. The extending section is inside the housing. Set toward the arc extinguishing chamber, the end of the extension section is used to cooperate with the movable contact, and the connecting line between the two static contacts and the movable contact overlaps with the length of the rectangular housing The included angle of the direction is in the range of 15°-65°.
3. The switch unit according to claim 2, wherein the end of the extension section is further formed with an arc-generating fillet or an arc-generating obtuse angle connected to the arc guide surface.
4. The switch unit according to claim 2 or 3, wherein the arc-starting piece is a V-shaped folding plate, a V-shaped arm of the V-shaped folding plate is connected to the extension section, and the V-shaped folding plate has a Another V-shaped arm is provided toward the arc extinguishing chamber.
5. The switch unit according to claim 4, wherein a V-shaped arm of the arc ignition blade facing the arc extinguishing chamber includes a guide section and a bending section connected to each other, and the bending section is located in the arc extinguishing chamber. On one side of the arc extinguishing chamber, the bending section is arranged parallel or approximately parallel to the arc extinguishing grid piece close to the bending section in the arc extinguishing chamber.
6. The switch unit according to claim 5, wherein the side surface of the guide section facing the arc extinguishing chamber is connected to the arc guide surface to form a flat surface or an arc surface, or the guide section faces the arc extinguishing chamber. One side surface of the arc chamber is connected to the arc guide surface, and the connection angle is between 150° and 180°.
7. The switch unit according to claim 5 or 6, wherein a magnetizing block is also provided in the V-shaped area formed by the static contact and the arc striking piece, and the magnetizing block is used to increase the arc blowing force, to blow the arc toward the arc extinguishing chamber.
8. The switch unit according to claim 7, wherein the magnetizing block includes a first connecting arm and a second connecting arm arranged in a V-shape, the first connecting arm corresponding to the extension section, and the third connecting arm Two connecting arms are arranged corresponding to a V-shaped arm of the arc ignition piece facing the arc extinguishing chamber.
9. The switch unit according to claim 7, wherein the magnetization block includes a first magnetization section and a second magnetization section connected to each other, the first magnetization section has a structure parallel or approximately parallel to the guide section. The first magnetizing surface, the second magnetizing section has a second magnetizing surface that is parallel or approximately parallel to the bending section.
10. The switch unit according to claim 7, wherein the magnetizing block has a U-shaped structure, and a V-shaped arm of the arc ignition piece facing the arc extinguishing chamber is disposed between two side plates of the U-shaped structure. between.
11. A switch unit, which includes a base, a static contact and an arc extinguishing chamber that are fixedly installed in the base, a movable contact that is rotated in the base, and an upper cover. The base is provided with a A slot is provided with an opening on one side of the slot close to the arc extinguishing chamber. The end of the movable contact can be located in the slot and rotate and slide into the arc extinguishing chamber through the opening. , The upper cover is provided with a blocking block corresponding to the relief groove, the upper cover is assembled and connected with the base, and the blocking block is inserted into the relief groove.
12. The switch unit according to claim 11, wherein the movable contact includes a movable contact bracket and a movable contact busbar fixedly arranged on the movable contact bracket, and the movable contact bracket rotates relative to the base. , so that the end of the movable contact busbar cooperates with the opening and closing of the static contact.
13. The switch unit according to claim 12, wherein each of the stationary contacts, the arc extinguishing chamber, the relief groove and the blocking block includes two, and the opposite ends of the movable contact busbar Plug-in parts are respectively provided, and the two static contacts, the two arc extinguishing chambers, the two plug-in parts, the two relief grooves and the two blocking blocks are all along the The geometric center of the moving contact bracket is centrally symmetrical.
14. The switch unit according to claim 13, wherein along the mounting surface perpendicular to the assembly direction of the base and the upper cover, the movable contact bracket and the two movable contact brackets located on opposite sides of the movable contact bracket The relief groove and the two blocking blocks can separate the unit housing formed by assembling the base and the upper cover into two mutually independent installation cavities.
15. The switch unit according to claim 13 or 14, wherein the moving contact bracket is provided with two openings, and the two plug-in parts extend out of the moving contact through the corresponding openings. Outside the bracket, along the circumferential direction of the movable contact bracket, the arc length of the movable contact bracket between the two openings is greater than the arc length between the side of the relief slot and close to the arc extinguishing chamber. The arc length of the movable contact bracket between the side of the static contact close to the arc extinguishing chamber.
16. The switch unit according to any one of claims 12 to 15, wherein the base and the upper cover are respectively provided with a first sub-accommodating groove and a second sub-accommodating groove, the first sub-accommodating groove Together with the second sub-accommodating groove, a receiving groove is formed for accommodating the movable contact bracket, and the movable contact bracket is concentrically accommodated in the accommodating groove.
17. The switch unit according to any one of claims 11 to 16, wherein the movable contact rotates relative to the base to form a rotation path matching the opening and closing of the stationary contact, and the stationary contact and The arc extinguishing chambers are respectively located outside the rotation path, and the static contacts are located on a side of the arc extinguishing chamber away from the relief slot.
18. The switch unit according to any one of claims 11 to 17, wherein the shape of the blocking block is adapted to the shape of the relief groove.
19. An isolating switch, which includes a plurality of switch units arranged in a stack and an operating mechanism connected to the switch unit. The operating mechanism is provided with an operating handle, wherein the switch unit is according to claims 1 to 10 The switch unit according to any one of claims 11 to 18.
20. The isolating switch according to claim 19, wherein, in the case where the switch unit is the switch unit according to any one of claims 1 to 10, the connection section of each of the stationary contacts extends out Portions of the housing are staggered along the stacking direction of the switching units.
21. The isolating switch according to claim 19, wherein when the switch unit is the switch unit according to any one of claims 11 to 18, a plurality of the switch units are stacked in sequence, and the The operating handle is drivingly connected to the movable contact of each switch unit through the operating mechanism, and the operating handle is used to drive the operating mechanism to rotate to drive the movable contacts of multiple switch units to rotate synchronously.
22. A power supply system, wherein the power supply system includes: a DC source, a power conversion unit and an isolation switch according to any one of claims 19 to 21, the isolation switch is connected between the DC source and the Between the power conversion units, when the DC source or the power conversion unit fails, the isolation switch is operated to realize opening.