A switching unit, disconnector and power supply system

Abstract

The application discloses a switch unit, an isolating switch and a power supply system, and relates to a switch unit and an isolating switch. The switch unit comprises a shell, a movable contact arranged in the shell, a movable contact support, a static contact and an arc extinguishing chamber corresponding to the static contact. The movable contact can be inserted with the static contact. An arc guiding surface is formed on the static contact. An arc leading piece is connected to the static contact. An arc leading surface is formed by connecting the arc guiding surface and one side surface of the arc leading piece. The arc leading surface extends to one side of the arc extinguishing chamber, so that the arc generated at the static contact is introduced into the arc extinguishing chamber through the arc leading surface. The arc leading effect is improved, and the arc extinguishing capacity of the isolating switch is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disconnectors, in particular to a switch unit, a disconnector and a power supply system. BACKGROUND

[0002] The existing rotating disconnectors are usually stacked by several switch units, each switch unit includes a shell, a corresponding moving contact and a static contact are installed in each shell, the static contact external terminal extends to the outside of the shell, a moving contact rotating frame for installing the moving contact is arranged in the middle of the shell, the static contact external terminal extends to the outside of the shell, each moving contact is composed of two moving contact pieces, the two moving contact pieces are arranged in pairs and oppositely on the moving contact piece mounting frame, a matching gap for inserting the static contact is arranged between the paired moving contact pieces, a shaft core for driving the synchronous rotation of each moving contact rotating frame is arranged between each shell, so that the moving contact piece and the static contact form a contact conducting and separating relationship.

[0003] When the moving contact and the static contact are separated, an arc will be generated, which not only has a great destructive effect on the contacts, but also prolongs the time of breaking the circuit, which brings hidden dangers to the use of the disconnector, so an arc extinguishing chamber is usually arranged in each switch unit for arc extinguishing, therefore, 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, and the current arc root introduction structure of the static contact is difficult to achieve rapid transfer of the arc root, which causes the arc to burn on the static contact, resulting in serious burning of the static contact, and the arc cannot quickly enter the arc extinguishing chamber, so the actual effect of the arc extinguishing chamber is difficult to play. SUMMARY

[0004] The purpose of the present application is to provide a switch unit, a disconnector and a power supply system, which can improve the arc introduction effect and improve the arc extinguishing ability of the disconnector.

[0005] The embodiment of the present application is implemented as follows:

[0006] In one aspect of the embodiment of the present application, a switch unit is provided, which includes a shell, a moving contact, a moving contact support, a static contact arranged in the shell, and an arc extinguishing chamber corresponding to the static contact, the moving contact can be inserted with the static contact, an arc guiding surface is formed on the static contact, an arc introduction piece is connected to the static contact, and an arc introduction surface is formed by connecting the arc guiding surface and one side surface of the arc introduction piece, the arc introduction surface extends to one side of the arc extinguishing chamber, so that the arc generated at the static contact is introduced into the arc extinguishing chamber through the arc introduction surface.

[0007] Optionally, as an implementable mode, the shell is a rectangular shell, the static contact includes two, the dynamic contact is respectively inserted with two static contacts, the static contact includes a connecting section and an extending section connected with each other, the connecting section is matched with the shell and extends to outside of the shell to realize electrical connection with external electrical equipment, the extending section is arranged in the shell and faces the arc extinguishing chamber, and the end of the extending section is used for matching with the dynamic contact. The angle between the line of the overlapping position of the two static contacts and the dynamic contact and the length direction of the rectangular shell is within the range of 15°-65°.

[0008] Optionally, as an implementable mode, the end of the extending section is further formed with an arc generation fillet or an arc generation obtuse angle connected with the arc guiding surface.

[0009] Optionally, as an implementable mode, the arc guiding piece is a V-shaped folding plate, one V-shaped arm of the V-shaped folding plate is connected with the extending section, and the other V-shaped arm of the V-shaped folding plate faces the arc extinguishing chamber.

[0010] Optionally, as an implementable mode, one V-shaped arm of the arc guiding piece facing the arc extinguishing chamber includes a guiding section and a bending section connected with each other, the bending section is located at one side of the arc extinguishing chamber, and the bending section is arranged in parallel or approximately in parallel with the arc extinguishing grid piece close to the bending section in the arc extinguishing chamber.

[0011] Optionally, as an implementable mode, one side surface of the guiding section facing the arc extinguishing chamber is connected with the arc guiding surface as a plane or an arc surface, or one side surface of the guiding section facing the arc extinguishing chamber is connected with the arc guiding surface, and the connection angle is within the range of 150°-180°.

[0012] Optionally, as an implementable mode, a magnetic enhancement block is further arranged in the V-shaped area formed by the static contact and the arc guiding piece, and the magnetic enhancement block is used for increasing the arc blowing force to blow the arc to the arc extinguishing chamber.

[0013] Optionally, as an implementable mode, the magnetic enhancement block includes a first connecting arm and a second connecting arm arranged in a V shape, the first connecting arm corresponds to the extending section, and the second connecting arm corresponds to one V-shaped arm of the arc guiding piece facing the arc extinguishing chamber.

[0014] Optionally, as an implementable mode, the magnetic enhancement block includes a first magnetic enhancement section and a second magnetic enhancement section connected with each other, the first magnetic enhancement section has a first magnetic enhancement surface in parallel or approximately in parallel with the guiding section, and the second magnetic enhancement section has a second magnetic enhancement surface in parallel or approximately in parallel with the bending section.

[0015] Optionally, as an implementable manner, the magnetic block is in a U-shaped structure, and the arc striking piece is arranged between two side plates of the U-shaped structure and faces a V-shaped arm of the arc extinguishing chamber. In another aspect of the embodiment of the present application, a disconnecting switch is provided, which comprises a plurality of switch units stacked as any one of the above and an operating mechanism connected with the switch units, and an operating handle is arranged on the operating mechanism.

[0016] Optionally, as an implementable manner, the part of the connecting section of each static contact that extends out of the shell is staggered along the stacking direction of the switch units.

[0017] The embodiment of the present application also provides a power supply system, which comprises a direct current source, a power conversion unit and the disconnecting switch as described above, and the disconnecting switch is connected between the direct current source and the power conversion unit, and the switch is operated to realize opening when the direct current source or the power conversion unit fails.

[0018] The beneficial effects of the embodiment of the present application include:

[0019] The switch unit, the disconnecting switch and the power supply system provided by the present application comprise a shell, a moving contact arranged in the shell, a moving contact support, a static contact and an arc extinguishing chamber corresponding to the static contact. The moving contact can be plugged with the static contact. An arc guiding surface is formed on the static contact. An arc striking piece is connected to the static contact. An arc striking surface is formed by the arc guiding surface and one side surface of the arc striking piece. The arc striking surface extends to one side of the arc extinguishing 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 conducted from the static contact to the arc extinguishing chamber, thereby improving the arc striking effect of the switch unit. By ensuring that the arc can smoothly enter the arc extinguishing chamber so that the arc extinguishing chamber can extinguish the arc, the arc extinguishing capacity of the disconnecting switch is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0021] Figure 1 One of the structural schematic diagrams of the switch unit provided by the embodiment of the present application;

[0022] Figure 2 The second structural schematic diagram of the switch unit provided by the embodiment of the present application;

[0023] Figure 3 One of the structural schematic diagrams of the static contact, the arc striking piece and the magnetic block in the switch unit provided by the embodiment of the present application;

[0024] Figure 4 Fig. 2 is a structural schematic diagram of a static contact, an arc striking piece and a magnetic enhancement block in a switch unit according to an embodiment of the present application;

[0025] Figure 5 Fig. 3 is a structural schematic diagram of a static contact, an arc striking piece and a magnetic enhancement block in a switch unit according to an embodiment of the present application;

[0026] Figure 6 Fig. 4 is a structural schematic diagram of a disconnecting switch according to an embodiment of the present application;

[0027] Figure 7 Fig. 5 is a structural schematic diagram of a plurality of switch units stacked in a disconnecting switch according to an embodiment of the present application.

[0028] Fig. 1 is a structural schematic diagram of a disconnecting switch according to an embodiment of the present application. As shown in Fig. 1, the disconnecting switch 200 comprises a plurality of switch units 100, an operating mechanism 210 and an operating handle 220. The switch units 100 are stacked in the disconnecting switch 200. The operating mechanism 210 is connected to the switch units 100 and the operating handle 220. The operating handle 220 is used to drive the operating mechanism 210 to operate the switch units 100. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0031] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Please refer to Figure 1 and Figure 3 The embodiment provides a switch unit 100, which comprises a shell 110, a moving contact, a moving contact support, a static contact 120 arranged in the shell 110, and an arc extinguishing chamber 130 corresponding to the static contact 120. The moving contact can be plugged with the static contact. The static contact 120 is provided with an arc guiding surface 123. An arc guiding sheet 140 is connected to the static contact 120. The arc guiding surface 123 and one side surface of the arc guiding sheet 140 are connected to form an arc guiding surface. The arc guiding surface 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 guiding surface.

[0034] Specifically, the arc guiding sheet 140 is connected to the static contact 120. The arc guiding surface 123 and one side surface of the arc guiding sheet 140 are connected to form an arc guiding surface, which is equivalent to extending the arc guiding surface 123 on the static contact 120 to the arc extinguishing chamber 130. In this way, the arc stagnation at the arc guiding surface on the static contact 120 is avoided, so that the static contact 120 is not damaged by burning. The arc extinguishing effect of the switch unit 100 is ensured. The arc guiding surface formed by the connection of the arc guiding surface 123 and one side surface of the arc guiding sheet 140 can be a plane or a large obtuse angle surface, so that the arc can smoothly enter the arc extinguishing chamber 130. For example, the large obtuse angle surface can be set to 165°, 168°, 170° or 172°.

[0035] The switch unit 100 provided by the present application comprises a shell 110, a moving contact 160, a moving contact support 170, a static contact 120 arranged in the shell 110, and an arc extinguishing chamber 130 corresponding to the static contact 120. The moving contact 160 can be plugged with the static contact 120. The static contact 120 is provided with an arc guiding surface 123. An arc guiding sheet 140 is connected to the static contact 120. The arc guiding surface 123 and one side surface of the arc guiding sheet 140 are connected to form an arc guiding surface. The arc guiding surface 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 guiding surface, ensuring that the arc can be stably conducted from the static contact 120 to the arc extinguishing chamber 130, thereby improving the arc guiding 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 capacity of the disconnecting switch.

[0036] In one embodiment of the present application, as shown in Figure 2 the shell 110 is a rectangular shell 110, the static contact 120 includes two, the moving contact 160 is respectively inserted with two static contacts 120, the static contact 120 includes a connecting section 121 and an extension section 122 connected with each other, the connecting section 121 is matched with the shell 110 and extends to the outside of the shell 110 to realize electrical connection with external electrical equipment, the extension section 122 is arranged in the shell 110 and faces the arc extinguishing chamber 130, the end of the extension section 122 is used for matching with the moving contact, and the included angle between the line at the overlap position of the two static contacts and the moving contact and the length direction of the rectangular shell 110 is within the range of 15°-65°.

[0037] Specifically, the included angle between the line at the overlap position of the two static contacts 120 and the moving contact 160 and the length direction of the rectangular shell 110 is the α angle in Figure 2 When the α angle is less than 15°, the opening position of the moving contact 160 can be farther, the arrangement position of the grid sheet is larger, but the arc drawing sheet 140 is too steep, and the arc drawing effect is poor; when the α angle is greater than 65°, the arc drawing sheet 140 is very gentle, and the arc drawing is good, but the maximum opening position of the moving contact 160 is closer, and the space for arranging the grid sheet in the arc extinguishing chamber 130 is smaller, the α angle is set within the range of 15°-65°, the connection between the static contact 120 and the arc drawing sheet 140 is relatively smooth, arc drawing is easy, and the space of the arc extinguishing chamber 130 is ensured to be larger to arrange more grid sheets, at this time, the arc generated when the moving contact and the static contact 120 touch point separate can move to one corner of the rectangular shell 110, on this basis, the arc extinguishing chamber 130 is arranged to extend to both sides along the width direction of the rectangular shell 110, the setting range of the arc extinguishing chamber 130 is increased, so that the arc has a longer moving path in the arc extinguishing chamber 130, thereby ensuring the arc extinguishing capacity of the switch unit 100. The extension section 122 can be arranged to extend to the arc extinguishing chamber 130 at a preset angle with the width direction of the shell 110, or the extension section 122 can first extend a preset distance along the width direction of the shell 110, and then extend to the arc extinguishing chamber 130 along a direction at a preset angle with the width direction of the shell 110, so as to ensure that the included angle between the line at the end of the extension section 122 and the geometric center of the shell 110 and the length direction of the rectangular shell 110 is within the range of 15°-65°.

[0038] Further, the extension section 122 of the static contact 120 can also include a plurality of sub-extension sections extending in different directions or angles, so as to be closer to the moving path of the moving contact 160. It can be understood that the extension section 122 of the static contact 120 can also be composed of one straight sub-extension section and one or more sub-extension sections with bends.

[0039] In one embodiment of the present application, as shown in Figure 3As shown, the end of the extension section 122 is also formed with an arc generating fillet or an arc generating obtuse angle connected with the arc guiding surface 123.

[0040] Specifically, when the end of the extension section 122 is a sharp angle, part of the arc generated when the moving contact and the static contact 120 are separated will flow along the side of the static contact 120 away from the arc extinguishing chamber 130, which will bring hidden dangers to the use of the switch unit 100. The end of the extension section 122 with a sharp angle is difficult to guide the arc, so that the arc stays at the end of the extension section 122 for a long time, which causes the end of the extension section 122 to be burned, resulting in that the moving contact 160 is not inserted smoothly, or the moving and static contacts are not in contact ideally. At this time, the end of the extension section 122 is provided as a fillet or an obtuse angle, so as to increase the contact area of the end of the extension section 122 with the moving contact. Moreover, the arc generating fillet or the arc generating obtuse angle is easier to guide the arc to the arc guiding surface 123, and then guide the arc to the arc guiding plate 140 through the arc guiding surface 123, so that the arc can enter the arc extinguishing chamber 130. The arc generating obtuse angle can be 120°-160°.

[0041] In an embodiment of the present application, as shown in Figure 1 and Figure 3 The arc guiding plate 140 is a V-shaped plate, one V-shaped arm of the V-shaped plate is connected with the extension section 122, and the other V-shaped arm of the V-shaped plate is arranged towards the arc extinguishing chamber 130.

[0042] Specifically, the arc guiding plate 140 is arranged as a V shape. The V-shaped arm of the arc guiding plate 140 towards the arc extinguishing chamber 130 will not have a large bending angle with the arc guiding surface 123, so that when the arc passes through the arc guiding surface 123 and the arc guiding plate 140, the arc will not jump and stay on the arc guiding surface, which will cause the static contact 120 or the arc guiding plate 140 to be burned. On the other hand, when arranged as a V shape, the arc guiding plate 140 can guide the arc to the bottom of the rectangular shell 110. At this time, the setting range of the arc extinguishing chamber 130 can extend to both sides along the width direction of the rectangular shell 110, so as to ensure the arc extinguishing ability of the arc extinguishing chamber 130.

[0043] In an embodiment of the present application, as shown in Figure 1 and Figure 3 The V-shaped arm of the arc guiding plate 140 towards the arc extinguishing chamber 130 includes a guiding section 141 and a bending section 142 connected with each other. The bending section 142 is located at one side of the arc extinguishing chamber 130, and the bending section 142 is arranged parallel or approximately parallel with the arc extinguishing grid blade in the arc extinguishing chamber 130 close to the bending section 142.

[0044] Specifically, the bending section 142 is arranged at the end of the arc striking piece 140 towards 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 pass through the arc striking surface on the bending section 142 more smoothly to enter the arc extinguishing chamber 130 and be cut off by the arc extinguishing grid piece arranged at intervals.

[0045] In an embodiment of the present application, as shown in Figure 1 and Figure 3 , the static contact 120 is integrally formed with the arc striking piece 140.

[0046] Specifically, the static contact 120 is integrally arranged with the arc striking piece 140, that is, the extension section 122 of the static contact 120 is a V-shaped arm of a V-shaped structure, and the arc striking piece 140 is another V-shaped arm of a V-shaped structure. At this time, the arc guiding surface 123 of the static contact 120 and the arc striking surface formed by the side surface of the arc striking piece 140 have no gap, which can better ensure the conduction of the arc on the arc striking surface. On the other hand, by integrally arranging the static contact 120 with the arc striking piece 140, the assembly of the static contact 120 and the arc striking piece 140 on the housing 110 is facilitated, thereby improving the assembly and production efficiency of the disconnecting switch and saving production cost.

[0047] In an embodiment of the present application, as shown in Figure 1 and Figure 3 , the side surface of the guiding section 141 towards the arc extinguishing chamber 130 is connected with the arc guiding surface 123 as a plane or an arc surface, or the side surface of the guiding section 141 towards the arc extinguishing chamber 130 is connected with the arc guiding surface 123 with an included angle between 150° and 180°. In this way, the arc striking surface formed by the arc guiding surface 123 and the guiding section 141 is relatively smooth, so as to ensure that the arc passes through the arc striking surface smoothly to enter the arc extinguishing chamber 130.

[0048] In an embodiment of the present application, as shown in Figure 1 and Figure 3 , the V-shaped region formed by the static contact 120 and the arc striking piece 140 is further provided with a magnetic enhancement block 150. The magnetic enhancement block 150 is used to increase the arc blowing force to blow the arc towards the arc extinguishing chamber 130.

[0049] Specifically, when the moving contact and the static contact 120 are separated, the current flows from the static contact 120 to the arc leading piece 140, and then flows to the moving contact through the arc. According to the Ampere rule, the magnetic induction intensity in the V-shaped area is inwardly perpendicular to the installation surface of the shell 110, and the magnetic induction intensity outside the V-shaped area is outwardly perpendicular to the installation surface of the shell 110. According to the left-hand rule, the arc is subjected to a horizontal rightward Lorentz force under the action of the magnetic induction intensity outwardly perpendicular to the paper. The arc is elongated under the action of the blowout force, and the arc is transferred along the arc leading surface to the arc extinguishing chamber 130. At this time, the magnetic enhancement block 150 is arranged in the V-shaped area, so as to increase the magnetic induction intensity in the V-shaped area, and the magnetic induction intensity outside the V-shaped area is also increased accordingly, so as to increase the blowout force, and further accelerate the arc to be transferred along the arc leading surface to the arc extinguishing chamber 130. It should be noted that when the current flows reversely, the magnetic blowout force of the arc is still directed to the arc extinguishing chamber 130, so as to ensure the arc extinguishing ability of the arc extinguishing chamber 130.

[0050] In an embodiment of the present application, as shown in Figure 3 The magnetic enhancement block 150 includes a first connecting arm 151 and a second connecting arm 152 arranged in a V-shaped manner. The first connecting arm 151 corresponds to the extension section 122, and the second connecting arm 152 corresponds to a V-shaped arm of the arc leading piece 140 directed to the arc extinguishing chamber 130.

[0051] Specifically, on the basis of the V-shaped area formed by the static contact 120 and the arc leading piece 140, the magnetic enhancement block 150 is also arranged in a V-shaped structure. The first connecting arm 151 corresponds to the extension section 122, and the second connecting arm 152 corresponds to a V-shaped arm of the arc leading piece 140 directed to the arc extinguishing chamber 130. When the V-shaped arm of the arc leading piece 140 directed to the arc extinguishing chamber 130 is a straight arm, the second connecting arm 152 is also arranged as a branch arm, so as to further accelerate the arc to be transferred along the arc leading surface to the arc extinguishing chamber 130.

[0052] When the V-shaped arm of the arc leading piece 140 directed to the arc extinguishing chamber 130 includes a guide section 141 and a bent section 142, the second connecting arm 152 is also arranged with a corresponding bent section 142, so as to increase the blowout force and further accelerate the arc to be transferred along the arc leading surface to the arc extinguishing chamber 130.

[0053] In an embodiment of the present application, as shown in Figure 4 The magnetic enhancement block includes a first magnetic enhancement section 153 and a second magnetic enhancement section 154 connected with each other. The first magnetic enhancement section 153 has a first magnetic enhancement surface parallel or approximately parallel to the guide section 141, and the second magnetic enhancement section 154 has a second magnetic enhancement surface parallel or approximately parallel to the bent section 142.

[0054] Specifically, the shell 110 is provided with a clamping groove for placing the magnetic block 150. One side of the first magnetic segment 153 facing the guide segment 141 is a first magnetic surface, which is parallel to the arc guiding surface of the guide segment 141. One side of the second magnetic segment 154 facing the bending segment 142 is a second magnetic surface, which is parallel to the arc guiding surface of the bending segment 142, so as to increase the magnetic induction intensity and accelerate the transfer speed of the electric arc along the arc guiding surface to the arc extinguishing chamber 130.

[0055] In an embodiment of the present application, as shown in Figure 5 the magnetic block 150 has a U-shaped structure, and the V-shaped arm of the arc guiding piece 140 facing the arc extinguishing chamber 130 is arranged between the two side plates of the U-shaped structure.

[0056] Specifically, when the magnetic block 150 corresponds to the arc guiding piece 140, the magnetic block 150 only corresponds to one side of the arc guiding piece 140. When the magnetic block 150 has a U-shaped structure, the magnetic block 150 includes a bottom plate and two side plates arranged correspondingly. The bottom plate and the two side plates cover three sides of the arc guiding piece 140. The magnetic induction intensity formed by the three-side-covered magnetic block 150 is greater than that formed by the single-side-covered magnetic block 150, and the arc blowing force on the electric arc is greater, which is more conducive to the transfer of the electric arc along the arc guiding piece 140 to the arc extinguishing chamber 130.

[0057] The present application also discloses an isolating switch 200, please refer to Figure 7 which includes a plurality of switch units 100 stacked as in the foregoing embodiments, and an operating mechanism 210 connected with the switch units 100. The operating mechanism 210 is provided with an operating handle 220.

[0058] In an embodiment of the present application, as shown in Figure 6 the part of the connecting segment 121 of each static contact 120 extending out of the shell 110 is staggered along the stacking direction of the switch units 100.

[0059] Specifically, the part of the connecting segment 121 of the static contact 120 extending out of the shell 110 is a wiring portion 124. When the wiring portions 124 on the adjacent two switch units 100 are arranged at the same position relative to the shell 110, the electrical gap between the wiring portions 124 on the adjacent two switch units 100 is small, which is easy to be broken down. The present application staggeredly arranges the wiring portions 124 to increase the electrical gap and avoid the breakdown voltage from damaging the wiring portions 124, so as to ensure the stable use of the isolating switch 200.

[0060] In an example, the length of the connecting section 121 of the fixed contact 120 can be lengthened to change the arrangement position of the wiring portion 124 on the housing 110. The wiring portion 124 on one housing 110 can be arranged at one end of the length direction of the housing 110, and the wiring portion 124 on the adjacent housing 110 can be arranged at the other end of the length direction of the housing 110. In this case, the distance between the wiring portions 124 on the adjacent two housings 110 is the largest, and the working stability of the disconnector 200 can be better ensured.

[0061] The embodiment of the present application further discloses a power supply system, which comprises a direct current source, a power conversion unit and the disconnector 200 in the foregoing embodiment. The disconnector 200 is connected between the direct current source and the power conversion unit. When the direct current source or the power conversion unit fails, the disconnector 200 is operated to realize opening.

[0062] The above merely provides preferred embodiments of the present application but should not be used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modified, equivalent replaced, improved or the like within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A switching unit, characterized by comprising: The switch comprises a shell, a moving contact arranged in the shell, a moving contact support, a stationary contact, and an arc extinguishing chamber corresponding to the stationary contact. The moving contact is capable of being inserted with the stationary contact. An arc guiding surface is formed on the stationary contact. An arc striking sheet is connected to the stationary contact. A side surface of the arc striking sheet and the arc guiding surface are connected to form an arc striking surface. The arc striking 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 striking surface. The shell is a rectangular shell. The stationary contact comprises two stationary contacts. The moving contact is inserted with the two stationary contacts at two ends thereof. The stationary contact comprises at least a connecting section and an extending section which are connected to each other. The connecting section is matched with the shell and extends out of the shell to realize electrical connection with external electrical equipment. The extending section is arranged in the shell and faces the arc extinguishing chamber. The end of the extending section is used to match with the moving contact. The end of the extending section further forms an arc generating round corner or an arc generating obtuse angle which is connected with the arc guiding surface. The arc striking sheet is a V-shaped folding plate. One V-shaped arm of the V-shaped folding plate is connected with the extending section. The other V-shaped arm of the V-shaped folding plate faces the arc extinguishing chamber. The V-shaped arm of the arc striking sheet facing the arc extinguishing chamber comprises a guiding section and a bending section which are connected to each other. The bending section is arranged at one side of the arc extinguishing chamber. The bending section is arranged in parallel or approximately in parallel with the arc extinguishing grid in the arc extinguishing chamber which is close to the bending section.

2. The switching unit according to claim 1, characterized in that The angle between the line connecting the overlapping positions of the two stationary contacts and the moving contact and the length direction of the rectangular shell is in the range of 15°-65°.

3. The switching unit according to claim 1, characterized in that The side surface of the guiding section facing the arc extinguishing chamber and the arc guiding surface are connected to form a plane or an arc surface. Alternatively, the side surface of the guiding section facing the arc extinguishing chamber and the arc guiding surface are connected with an angle in the range of 150°-180°.

4. The switching unit according to claim 1, characterized in that A magnetic enhancement block is arranged in the V-shaped area formed by the stationary contact and the arc striking sheet. The magnetic enhancement block is used to increase the arc blowing force to blow the arc to the arc extinguishing chamber.

5. The switching unit according to claim 4, characterized in that The magnetic enhancement block comprises a first connecting arm and a second connecting arm which are arranged in a V shape. The first connecting arm corresponds to the extending section. The second connecting arm corresponds to the V-shaped arm of the arc striking sheet facing the arc extinguishing chamber.

6. The switching unit according to claim 4, characterized in that The magnetic enhancement block comprises a first magnetic enhancement section and a second magnetic enhancement section which are connected to each other. The first magnetic enhancement section has a first magnetic enhancement surface which is parallel or approximately parallel to the guiding section. The second magnetic enhancement section has a second magnetic enhancement surface which is parallel or approximately parallel to the bending section.

7. The switching unit according to claim 4, characterized in that The magnetic enhancement block has a U-shaped structure. The V-shaped arm of the arc striking sheet facing the arc extinguishing chamber is arranged between the two side plates of the U-shaped structure.

8. A disconnector, characterized in that The switch comprises a plurality of switch units arranged in layers as claimed in any one of claims 1-7 and an operating mechanism connected with the switch units. An operating handle is arranged on the operating mechanism.

9. The disconnector according to claim 8, characterized in that The part of the connecting section of each stationary contact extending out of the shell is arranged staggered along the stacking direction of the switch units.

10. A power supply system characterized by comprising: The switch comprises A DC source, a power conversion unit, and an isolating switch according to claim 8 or 9, the isolating switch being connected between the DC source and the power conversion unit, and being operated to open the circuit in the event of a fault in the DC source or the power conversion unit.

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