Switch unit and isolating switch

Abstract

The utility model provides a switch unit and an isolating switch, and relates to the technical field of low-voltage electric appliances. The utility model provides a switch unit. The switch unit comprises an arc extinguish chamber, a static contact and a moving contact used for being matched with the static contact for opening and closing. The whole switch unit adopts a plug-in type movable contact and a plug-in type static contact, and the static contact is of a two-piece plug-in piece type structure. During closing, the moving and static contacts are plugged, and the circuit is switched on. And during opening, the moving contact increases arc motion through an arc extinguishing structure formed by the arc extinguishing chamber on the opening path, so that the arc is quickly extinguished, a critical current test is helped to pass, and the use effect and the safety of the switch unit are ensured. The utility model further provides an isolating switch which comprises the switch unit and an operating mechanism, the operating mechanism drives the moving contact of the switch unit to move for opening or closing, and the isolating switch is low in overall structure and cost, high in safety and capable of being used for opening or closing of a high-voltage direct-current circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a switch unit and an isolating switch. Background Art

[0002] As one of the indispensable electrical components of the control circuit, the isolating switch plays a role of control and protection in the power system and is widely used in many production processes and technical equipment. In the existing low-voltage electrical field, direct current can only reach DC1500V. According to the latest low-voltage electrical industry standard development plan, it will develop to AC2000V-DC3000V. Among the isolating switches, the current new products can only reach DC750V for one pole and DC1500V for two poles, and the products of various companies cannot reach DC2000V and DC2500V. At present, there are customer demands for low-voltage electrical appliances of DC2000~2500V in the market, and the existing DC1500V products have low arc extinguishing efficiency or completely lose the arc extinguishing effect when subjected to voltages higher than DC1500V, which not only cannot meet the use requirements, but may also cause safety accidents. Therefore, it is urgent to provide a switch unit and isolating switch adapted to higher voltages. Utility Model Content

[0003] The purpose of the utility model is to provide a switch unit and an isolating switch for solving the above technical problems.

[0004] A switch unit comprises: an arc extinguishing chamber, a static contact and a moving contact for cooperating with the static contact in opening and closing. The static contact comprises two plug-in pieces arranged opposite to each other to form a gap. The moving contact is driven to move to the gap and plugged with the plug-in pieces on both sides of the gap to cooperate with the static contact in closing. The arc extinguishing chamber is arranged on the opening and closing path of the moving contact.

[0005] Furthermore, the stationary contact further comprises an elastic member located between the two plug-in sheets, and the elastic member is used to provide a force to the two plug-in sheets so that ends of the two plug-in sheets close to the moving contact tend to approach each other.

[0006] Furthermore, the plug-in piece is an elastic piece, and when the moving contact is located in the gap, the elastic piece abuts against two opposite sides of the moving contact.

[0007] Furthermore, a guiding inclined surface for guiding the moving contact to move to the gap is arranged on the plug-in piece and / or the moving contact.

[0008] Furthermore, the stationary contact further comprises a fixing frame and a supporting shell, the supporting shell is arranged on the fixing frame, and one end of the plug-in piece away from the moving contact is connected to the supporting shell.

[0009] Furthermore, the arc extinguishing chamber includes a plurality of arc extinguishing grids arranged at intervals along the moving contact opening and closing path, and an arc extinguishing channel with one end close to the moving contact opening and closing path and the other end away from the moving contact opening and closing path is formed between adjacent arc extinguishing grids, and the length of the arc extinguishing channel close to the static contact is greater than the length of the arc extinguishing channel away from the static contact.

[0010] Furthermore, the arc extinguishing chamber includes a first arc extinguishing area close to the static contact and a second arc extinguishing area away from the static contact. The arc extinguishing grids located in the first arc extinguishing area are arranged at intervals in the circumferential direction along the rotating axis of the moving contact, and the arc extinguishing grids located in the second arc extinguishing area are arranged in a straight line with uniform intervals.

[0011] Furthermore, a through groove for accommodating at least part of the moving contact opening and closing path is provided on one side of the arc extinguishing chamber close to the moving contact opening and closing path, and the ratio of the width of the two opposite side walls of the through groove to the thickness of the moving contact is (1.5-2):1.

[0012] Furthermore, a gas generating device is provided at the rotating shaft of the moving contact, which is used to blow the arc generated at the moving contact toward the arc extinguishing chamber.

[0013] The utility model also provides an isolating switch, which comprises any of the above switch units and an operating mechanism, wherein the operating mechanism is drivingly connected to a moving contact of the switch unit and is used to drive the moving contact to rotate to cooperate with the static contact of the switch unit to open and close.

[0014] The utility model provides a switch unit, which includes: an arc extinguishing chamber, a static contact, and a moving contact for cooperating with the static contact for opening and closing. The entire switch unit adopts plug-in moving and static contacts, and the static contact is a two-piece plug-in sheet structure. When closing the switch, the moving and static contacts are plugged in to connect the circuit. When opening the switch, the moving contact forms an arc extinguishing structure through the arc extinguishing chamber on the opening path, which increases the arc movement and quickly extinguishes the arc, helps pass the critical current test, and ensures the use effect and safety of the switch unit.

[0015] The utility model also provides an isolating switch, which includes any of the above-mentioned switch units and an operating mechanism, and the operating mechanism drives the moving contact of the switch unit to move to open or close the switch. The overall structure has low cost and high safety, and can be used for opening or closing higher voltage DC circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A three-dimensional diagram of a switch unit provided in an embodiment of the utility model;

[0018] Figure 2 A cross-sectional view of a switch unit provided in an embodiment of the utility model;

[0019] Figure 3 A diagram showing the coordination of a moving contact and a stationary contact in a switch unit provided in an embodiment of the utility model;

[0020] Figure 4 A cross-sectional view of a stationary contact in a switch unit provided in an embodiment of the utility model;

[0021] Figure 5 A structural diagram of an existing switch unit provided in an embodiment of the utility model;

[0022] Figure 6 A three-dimensional diagram of an isolating switch provided in an embodiment of the utility model.

[0023] Icons: 100-arc extinguishing chamber; 200-moving contact; 300-static contact; 301-plug-in plate; 302-fixing frame; 303-elastic member; 304-support shell; 101-first fixing plate; 102-second fixing plate; 103-arc extinguishing grid; 104-first arc extinguishing area; 105-second arc extinguishing area; 1031-arc extinguishing groove; 400-gas generating device; 500-switch unit; 600-operating mechanism. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] Example 1

[0029] A switch unit comprises: an arc extinguishing chamber 100, a static contact 300 and a moving contact 200 for cooperating with the static contact 300 for opening and closing. The static contact 300 comprises two plug-in pieces 301 arranged opposite to each other to form a gap. The moving contact 200 is driven to move to the gap and plugged with the plug-in pieces 301 on both sides of the gap to cooperate with the static contact 300 for closing. The arc extinguishing chamber 100 is arranged on the opening and closing path of the moving contact 200.

[0030] Please refer to Figure 1As shown, in this embodiment, the static contact 300 remains fixed, and the moving contact 200 is spaced apart from the static contact 300, so that the moving contact 200 can be disconnected from the static contact 300 to disconnect the circuit. At the same time, the moving contact 200 moves through the rotating shaft, so that the moving contact 200 rotates to the static contact 300 and abuts against the static contact 300 to close the circuit. The static contact 300 includes two plug-in plates 301 arranged opposite to each other, and a plug-in gap is formed between the plug-in plates 301 to accommodate the moving contact 200. When the moving contact 200 rotates to the position of the static contact 300, the moving contact 200 is inserted into the gap between the two plug-in plates 301, and the two plug-in plates 301 abut against the two sides of the moving contact 200 respectively, at which time the switch unit is closed and the circuit is connected. On the contrary, when the moving contact 200 rotates in the direction away from the moving contact 200, the moving contact 200 is separated from the plug-in gap, and the moving contact 200 is disconnected from the two plug-in pieces 301. At this time, the switch unit is opened and the circuit is disconnected. When opening, the moving contact 200 gradually separates from the plug-in piece 301 and finally separates from the plug-in piece 301, and finally the moving contact 200 is away from the static contact 300. In the process of opening movement from the moving contact 200 being completely separated from the plug-in piece 301 to gradually moving away from the static contact, an arc will be generated between the moving contact 200 and the static contact 300, which may cause a safety accident. At this time, by setting an arc extinguishing chamber 100 on the opening path of the moving contact 200, the arc is extinguished, the heat generated by the arc is dispersed, and the safety of the equipment is ensured. In this embodiment, the fixed contact 300 is formed by two plug-in sheets 301, and the movable contact 200 is connected through the gap between the plug-in sheets 301. Under the premise of ensuring that the contact area between the movable contact 200 and the fixed contact 300 meets the requirements and improving the connection stability, the thickness of the movable contact 200 can be reduced. Figure 1 and Figure 2 As shown, the moving contact 200 can be connected to the plug-in piece 301 using a single-piece matching piece. Figure 5 As shown, it can be understood that the traditional moving contact 200 usually adopts a two-piece or even multi-piece contact structure. In order to ensure the connection effect, the overall structure of the moving contact 200 is relatively wide. Arcs may be generated in multiple places when opening the switch, especially in DC2000-DC2500V DC circuits. The arcs generated by this wide moving contact 200 structure are difficult to extinguish, and it is difficult for the equipment to pass the DC critical circuit test. The smaller moving contact 200 provided in this embodiment has less resistance when moving and is easy to control. In conjunction with the static contact 300 with two plug-in pieces 301, the moving contact 200 is easy to connect with the static contact 300 or quickly disconnect from the static contact 300 to achieve opening. At the same time, the arc generated when the thinner moving contact 200 is opened is more concentrated. The arc extinguishing chamber 100 arranged along the opening path of the moving contact 200 increases the movement of the arc and is easy to extinguish the arc. It can be used for the opening and arc extinguishing operation of a DC circuit with a voltage of DC2000-DC2500V, with a wider range of applications and higher safety.

[0031] Optionally, in some implementations of this embodiment, the stationary contact 300 further includes an elastic member 303 located between the two plug-in plates 301, and the elastic member 303 is used to provide a force to the two plug-in plates 301 so that the two plug-in plates 301 close to one end of the moving contact 200 tend to approach each other.

[0032] Please refer to Figure 3 and Figure 4 As shown, an elastic member 303 is provided between the two plug-in sheets 301. Optionally, the elastic member 303 may be a spring, a reset spring, or other structures. The elastic member 303 is provided between the plug-in sheets 301, or may be provided on the sides of the two plug-in sheets 301, to provide an elastic force so that the ends of the two plug-in sheets 301 connected to the moving contacts 200 tend to move closer to each other. When the moving contact 200 is inserted into the gap between the two plug-in sheets 301 when the switch is closed, the two plug-in sheets 301 clamp the moving contact 200 under the action of the elastic member 303, so that the plug-in sheets 301 are always close to the moving contact 200, ensuring the stability of the circuit connection and avoiding dangerous situations such as poor contact.

[0033] Optionally, in some implementations of this embodiment, the stationary contact 300 further includes a fixing frame 302 and a supporting shell 304 , the supporting shell 304 is disposed on the fixing frame 302 , and one end of the plug-in piece 301 away from the moving contact 200 is connected to the supporting shell 304 .

[0034] Please refer to Figure 4As shown, in this embodiment, the static contact 300 includes a fixing frame 302 for mounting the plug-in piece 301, and a supporting shell 304 is arranged on the fixing frame 302. One end of the two plug-in pieces 301 away from the moving contact 200 is movably arranged in the supporting shell 304, and the elastic member 303 is also arranged in the supporting shell 304. The plug-in piece 301 is supported by the fixing frame 302 to ensure the stability of the plug-in piece 301. The fixing frame 302 and the supporting shell 304 shown can be made of metal material, which is convenient for connecting the external circuit to make the plug-in piece 301 energized. The plug-in piece 301 can be movable in the supporting shell 304, and the gap width between the two plug-in pieces 301 can be adjusted under the action of the elastic member 303, so that the moving contact 200 is inserted and abutted with the plug-in piece 301. The supporting shell 304 wraps the plug-in piece 301, fixes and limits the plug-in piece 301, ensures the stability of the plug-in piece 301, and allows the plug-in piece 301 to have a certain degree of freedom. The two plug-in pieces 301 form a clamp with a certain force under the action of the elastic member 303. When the clamp contacts and cooperates with the moving contact 200, an overtravel and a final pressure are formed. Even if there are traces of arc erosion on the moving contact 200, unevenness, adhesion, bending, etc., the moving contact 200 can be smoothly inserted between the two plug-in pieces 301 and stably connected to the plug-in pieces 301. Therefore, slight deformation and arc erosion of the moving contact 200 do not affect the actual use effect of the moving contact 200, and there is no need to replace the moving contact 200, thereby improving the service life of the moving contact 200 and the entire switch unit.

[0035] Optionally, in some other embodiments, the plug-in sheet 301 is an elastic sheet, and when the moving contact 200 is located in the gap, the elastic sheet abuts against two opposite sides of the moving contact 200 .

[0036] The plug-in piece 301 is made of metal and is set to a thin sheet structure. The thin sheet metal strip has a certain elastic force. By changing the shape of the two plug-in pieces 301, the ends of the plug-in pieces 301 connected to the moving contact 200 have a tendency to move closer to each other. When the switch is closed, the moving contact 200 is inserted into the gap between the two plug-in pieces 301 and squeezes the plug-in piece 301 to deform the plug-in piece 301. The plug-in piece 301 fits tightly against the moving contact 200 under the action of the self-generated elastic force, ensuring that the plug-in piece 301 is in good contact with the moving contact 200.

[0037] Please refer to Figure 3 As shown, in some implementations of this embodiment, a guiding inclined surface for guiding the moving contact 200 to move to the gap is provided on the plug-in sheet 301 and / or the moving contact 200 .

[0038] It can be understood that in order to ensure the stability of the connection between the moving contact 200 and the plug-in sheet 301, the gap between the two plug-in sheets 301 is smaller than the thickness of the moving contact 200. When the moving contact 200 is inserted into the gap between the two plug-in sheets 301, the elastic member 303 or the elastic plug-in sheet 301 is deformed. Under the action of the elastic force, the plug-in sheet 301 always fits the moving contact 200, thereby forming a good contact effect. However, because the gap between the plug-in sheets 301 is small, the moving contact 200 cannot be aligned with the gap between the two plug-in sheets 301 during the closing operation, which may cause the moving contact 200 to directly abut against the end of the plug-in sheet 301, and cannot be smoothly inserted into the gap, or cause a jam during the closing operation. The guiding inclined surface structure is symmetrically arranged on the two plug-in sheets 301, so that the moving contact 200 can be quickly aligned and inserted into the gap between the two plug-in sheets 301, and the closing process is smooth without jamming or stuck. Similarly, a slope structure is provided on the moving contact 200 to reduce the area of ​​the connection end between the moving contact 200 and the plug-in piece 301, forming a sloped guide structure to ensure that the moving contact 200 is quickly aligned and inserted into the gap between the plug-in pieces 301. During production, a guiding slope can be provided on the plug-in piece 301 or the moving contact 200 according to demand, or on both the plug-in piece 301 and the moving contact 200, to improve the smoothness of closing.

[0039] Optionally, in some implementations of the present embodiment, the arc extinguishing chamber 100 includes a plurality of arc extinguishing grids 103 arranged at intervals along the opening and closing path of the moving contact 200, and an arc extinguishing channel with one end close to the opening and closing path of the moving contact 200 and the other end away from the opening and closing path of the moving contact 200 is formed between adjacent arc extinguishing grids 103, wherein the length of the arc extinguishing channel close to the static contact 300 is greater than the length of the arc extinguishing channel away from the static contact 300.

[0040] Please refer to Figure 2As shown, in this embodiment, the arc extinguishing chamber 100 includes a first fixed plate 101, a second fixed plate 102, and a plurality of arc extinguishing grids 103 spaced apart between the first fixed plate 101 and the second fixed plate 102. A plurality of arc extinguishing grids 103 are arranged in a circular circumferential direction along the rotating shaft of the moving contact 200 to form the arc extinguishing chamber 100. An arc extinguishing channel is formed between two adjacent arc extinguishing grids 103. The arc generated when the moving contact 200 is opened is dispersed into a plurality of arc extinguishing channels and extinguished. The arc extinguishing grids 103 can be made of metal materials such as iron and aluminum, which are low in cost and have good thermal conductivity. When a plurality of arc extinguishing grids 103 are arranged to form the arc extinguishing chamber 100 and separate to extinguish the arc, the arc extinguishing grids 103 also form a good heat dissipation system, which quickly disperses the heat generated by the arc and improves the arc extinguishing effect and arc extinguishing speed. Furthermore, to ensure the arc extinguishing effect, the length of the arc extinguishing grid 103 at one end close to the static contact 300 is greater than the length of the arc extinguishing grid 103 at one end away from the static contact 300, so that the length of the arc extinguishing channel close to the static contact 300 is greater than the length of the arc extinguishing channel away from the static contact 300. It can be understood that during the opening process, the arc energy generated when the moving contact 200 has just completely separated from the static contact 300 is relatively strong. As the moving contact 200 gradually moves away from the static contact 300, the arc energy generated gradually decreases and eventually disconnects the circuit. Therefore, the arc extinguishing grid 103 at one end close to the static contact 300 undertakes the main arc extinguishing work. In this embodiment, a longer arc extinguishing grid 103 is set at the end close to the static contact 300 to form a longer arc extinguishing channel, which can dissipate heat to the maximum extent and ensure the arc extinguishing effect. A shorter arc extinguishing grid 103 is set at the end away from the static contact 300 to separate and extinguish the arc with lower residual energy. A shorter arc-extinguishing flash piece is arranged in the arc-extinguishing chamber 100 at one end away from the static contact 300, which can reduce costs, save space, and reduce the volume of the entire switch unit while ensuring the arc-extinguishing effect, making it easier to install and use.

[0041] Optionally, in some other embodiments, a plurality of arc extinguishing flash pieces of equal length may be evenly spaced circumferentially arranged around the rotating shaft of the static contact 300 to form the arc extinguishing chamber 100 , which is more suitable for the opening movement trajectory of the rotational movement of the static contact 300 .

[0042] Optionally, in some implementations of the present embodiment, the arc extinguishing chamber 100 includes a first arc extinguishing area 104 close to the static contact 300 and a second arc extinguishing area 105 away from the static contact 300, and the arc extinguishing grids 103 located in the first arc extinguishing area 104 are arranged at intervals in the circumferential direction along the axis of rotation of the moving contact 200, and the arc extinguishing grids 103 located in the second arc extinguishing area 105 are arranged in a straight line with uniform intervals.

[0043] Please refer to Figure 2As shown, in this embodiment, the moving contact 200 opens or closes the switch by rotating motion, and the motion trajectory of its movable end (i.e., the opening and closing path) is an arc route. In order to match the moving trajectory of the moving contact 200 and make full use of the space, the arc extinguishing grids 103 in the first arc extinguishing area 104 close to one end of the stationary contact 300 are arranged at intervals in the circumferential direction, which can make full use of the space and increase the length of the arc extinguishing grids 103. The arc extinguishing grids 103 in the second arc extinguishing area 105 far away from the stationary contact 300 are evenly spaced and arranged in a straight line, reducing the length of the arc extinguishing grids 103. The arc extinguishing grids 103 in the first arc extinguishing area 104 and the second arc extinguishing area 105 form an L-shaped arc extinguishing structure, which is convenient for matching the square installation structure and making full use of the space.

[0044] Optionally, in some implementations of the present embodiment, a through groove for accommodating at least part of the opening and closing path of the moving contact 200 is opened on one side of the arc extinguishing chamber 100 close to the opening and closing path of the moving contact 200, and the ratio of the width of the two opposite side walls of the through groove to the thickness of the moving contact 200 is (1.5-2):1.

[0045] Since the moving contact 200 adopts a single-piece contact structure, its thickness can be set to be relatively thin, and a through groove for accommodating at least part of the moving contact 200 opening and closing path is provided on one side of the arc extinguishing chamber 100 close to the opening and closing path of the moving contact 200. Figure 1 As shown, specifically, each arc extinguishing grid 103 is provided with an arc extinguishing groove 1031, and a plurality of arc extinguishing flash sheets are arranged so that the arc extinguishing grooves 1031 are connected to form a through groove. When the moving contact 200 moves, the end portion generating the arc moves in the through groove, and the arc extinguishing operation is performed through the arc extinguishing grid 103. Since the thickness of the moving contact 200 is relatively narrow, the width of the through groove can also be set to a relatively narrow structure, which can fully cover the moving contact 200 to form a relatively narrow moving gap. During the movement of the moving contact 200, the narrow through groove limits the movement of the arc, so that the arc is better dispersed into the arc extinguishing channel, thereby accelerating the arc extinguishing speed. The narrow slit structure formed by the arc extinguishing chamber 100 suppresses the occurrence of back breakdown. Once the arc enters the arc extinguishing chamber 100, the arc voltage always maintains a relatively high value, and the arc burning time will also become shorter.

[0046] Optionally, the ratio of the width of the two opposite side walls of the through slot to the thickness of the moving contact 200 is (1.5-2):1.

[0047] Theoretically, the smaller the width of the through slot, the better its wrapping property, which is convenient for improving the arc extinguishing effect. However, when the width of the through slot is too small, and the ratio of the width of the through slot to the thickness of the moving contact 200 is less than 1.5:1, during the rotation of the moving contact 200, its side wall is easy to rub against the arc extinguishing grids 103 on both sides, causing noise or wear, and even affecting the smoothness of the moving contact 200 when moving. Therefore, the minimum width of the through slot is 1.5 times the thickness of the moving contact 200, ensuring that the two sides of the moving contact 200 and the arc extinguishing grids 103 form a movable gap to avoid friction between the moving contact 200 and the arc extinguishing flash sheet. On the contrary, the width of the through slot should not be too large. When the width of the through slot is greater than twice the thickness of the moving contact 200, the gap between the moving contact 200 and the arc extinguishing chamber 100 is too large, and the above-mentioned effect of increasing the arc extinguishing speed through the narrow slit structure cannot be achieved. Therefore, the optimal width of the through slot is 1.5 to twice the thickness of the moving contact 200.

[0048] Optionally, in some other embodiments, arc-isolating members are respectively provided on both sides of the arc-extinguishing grid 103, and a narrow gap is formed between the arc-isolating members for passing the moving contact 200. The arc-extinguishing narrow gap is further formed by the arc-isolating members, so that the generated arcs can quickly enter the arc-extinguishing channel for arc-extinguishing, thereby improving the arc-extinguishing speed and arc-extinguishing effect.

[0049] Optionally, in some implementations of the present embodiment, a gas generating device 400 is provided at the rotating shaft of the moving contact 200 for blowing the arc generated at the moving contact 200 toward the arc extinguishing chamber 100 .

[0050] The gas generating device 400 cooperates with the narrow slit formed by the arc-isolating member to form a directional arc-extinguishing airflow. When the switch is opened, the gas generating device 400 cooperates with the narrow slit structure of the through slot to form a strong air blowing effect, blowing the arc into the narrow slit and the arc-extinguishing channel.

[0051] Optionally, in some implementations of this embodiment, the switch unit further includes a unit housing, and the arc extinguishing chamber 100, the moving contact 200, the static contact 300, etc. are all arranged inside the unit housing. The arc extinguishing chamber 100, the moving contact 200, the static contact 300 and other structures are encapsulated by the unit housing. On the one hand, it can prevent external substances from damaging the arc extinguishing chamber 100, the moving contact 200, the static contact 300 and other components, thereby improving the service life of the device. It also prevents operators from contacting the arc extinguishing chamber 100, the moving contact 200, the static contact 300 and other components to cause electric shock, thereby improving the safety of the device.

[0052] Example 2

[0053] This embodiment provides an isolating switch, which includes any of the above-mentioned switch units 500 and an operating mechanism 600. The operating mechanism 600 is drivingly connected to the moving contact 200 of the switch unit 500 and is used to drive the moving contact 200 to rotate to cooperate with the static contact 300 of the switch unit to open and close.

[0054] Please refer to Figure 6 As shown, the isolating switch provided in this embodiment adopts the above-mentioned switch unit with the arc extinguishing chamber 100, which can be used for the opening and closing of DC circuits under the voltage of DC2000-DC2500V. It has high safety, and the cost of the entire isolating switch is low and the operation is simple. The opening and closing operations can be completed by driving the moving contact 200 to rotate through the operating mechanism.

[0055] Optionally, in this embodiment, the isolating switch may include at least one switch unit. When it includes multiple switch units, the multiple switch units are stacked in sequence to form a switch body. The operating mechanism is located on one side of the switch body, and the operating mechanism is driven and connected to the moving contacts 200 in all the switch units to drive all the switch units to close and open synchronously.

[0056] In summary, the utility model provides a switch unit, which includes: an arc extinguishing chamber 100, a static contact 300, and a moving contact 200 for cooperating with the static contact 300 for opening and closing. The static contact 300 includes two plug-in pieces 301 arranged relatively to form a gap. The moving contact 200 is driven to move to the gap and plugged with the plug-in pieces 301 on both sides of the gap to cooperate with the static contact 300 for closing. The arc extinguishing chamber 100 is arranged on the opening and closing path of the moving contact 200. The switch unit adopts plug-in moving and static contacts 300, and the static contact 300 is a two-piece plug-in piece 301 structure. When closing, the moving and static contacts 300 are plugged in to connect the circuit. When opening, the moving contact 200 forms an arc extinguishing structure through the arc extinguishing chamber 100 on the opening path, which increases the arc movement and quickly extinguishes the arc, helping to pass the critical current test.

[0057] The utility model also provides an isolating switch, which includes any of the above switch units and an operating mechanism, has high safety, and the entire isolating switch has low cost and is easy to operate. The opening and closing operations can be completed by driving the moving contact 200 to rotate through the operating mechanism.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A switch unit, characterized in that: include: An arc extinguishing chamber (100), a stationary contact (300), and a moving contact (200) for opening and closing the circuit breaker in cooperation with the stationary contact (300); the stationary contact (300) comprises two plug-in plates (301) arranged opposite to each other to form a gap; the moving contact (200) is driven to move to the gap and plugs into the plug-in plates (301) on both sides of the gap to close the circuit breaker in cooperation with the stationary contact (300); and the arc extinguishing chamber (100) is arranged on the opening and closing path of the moving contact (200).

2. The switch unit according to claim 1, characterized in that: The stationary contact (300) further comprises an elastic member (303) located between the two plug-in plates (301), and the elastic member (303) is used to provide a force to the two plug-in plates (301), so that the ends of the two plug-in plates (301) close to the moving contact (200) tend to approach each other.

3. The switch unit according to claim 1, characterized in that: The plug-in sheet (301) is an elastic sheet, and when the moving contact (200) is located in the gap, the elastic sheet abuts against two opposite sides of the moving contact (200).

4. The switch unit according to claim 1, characterized in that: A guiding inclined surface for guiding the moving contact (200) to move to the clamping gap is provided on the plug-in sheet (301) and / or the moving contact (200).

5. The switch unit according to claim 1, characterized in that: The stationary contact (300) further comprises a fixing frame (302) and a supporting shell (304); the supporting shell (304) is arranged on the fixing frame (302); and one end of the plug-in piece (301) away from the moving contact (200) is connected to the supporting shell (304).

6. The switch unit according to claim 1, characterized in that: The arc extinguishing chamber (100) comprises a plurality of arc extinguishing grids (103) arranged at intervals along the opening and closing path of the moving contact (200); an arc extinguishing channel having one end close to the opening and closing path of the moving contact (200) and the other end away from the opening and closing path of the moving contact (200) is formed between adjacent arc extinguishing grids (103); the length of the arc extinguishing channel close to the stationary contact (300) is greater than the length of the arc extinguishing channel away from the stationary contact (300).

7. The switch unit according to claim 6, characterized in that: The arc extinguishing chamber (100) comprises a first arc extinguishing area (104) close to the stationary contact (300) and a second arc extinguishing area (105) away from the stationary contact (300); the arc extinguishing grids (103) located in the first arc extinguishing area (104) are arranged at intervals in a circumferential direction along the rotation axis of the moving contact (200); and the arc extinguishing grids (103) located in the second arc extinguishing area (105) are arranged in a straight line at even intervals.

8. The switch unit according to claim 1, characterized in that: A through groove for accommodating at least a portion of the opening and closing path of the moving contact (200) is provided on one side of the arc extinguishing chamber (100) close to the opening and closing path of the moving contact (200), and the ratio of the width of the two opposite side walls of the through groove to the thickness of the moving contact (200) is (1.5-2):

1.

9. The switch unit according to claim 1, characterized in that: A gas generating device (400) is provided at the rotating shaft of the moving contact (200) for blowing the electric arc generated at the moving contact (200) toward the arc extinguishing chamber (100).

10. An isolating switch, characterized in that: It comprises a switch unit and an operating mechanism as claimed in any one of claims 1 to 9, wherein the operating mechanism is drivingly connected to a moving contact (200) of the switch unit and is used to drive the moving contact (200) to rotate to cooperate with a stationary contact (300) of the switch unit for opening and closing.

Images