Switch

Abstract

A switch belongs to the technical field of switching devices. Comprising a shell, a pair of pole unit containing cavities and a middle containing cavity located between the pair of pole unit containing cavities are formed in the shell, a pole unit is arranged in each pole unit containing cavity, and each pole unit comprises a moving contact, a static contact, a first line bank connected with the moving contact and an arc extinguishing device used for extinguishing electric arcs generated between the moving contact and the static contact. The switch further comprises a short circuit board arranged in the middle containing cavity, the two ends of the short circuit board extend into the containing cavity of the same pole unit respectively, and the first connector bar of the same pole unit is electrically connected with the top grid piece of the arc extinguishing device. The arc extinguish chamber has the advantages that the middle accommodating cavity is reasonably utilized to provide an independent mounting and accommodating space for the short circuit board, the structure is concise, the convenience of mounting and maintenance is ensured, the cost can be reduced, the contact is effectively prevented from being ablated, and the insulating property of the arc extinguish chamber is improved.

Description

Technical Field

[0001] This utility model belongs to the field of switch and electrical appliance technology, and specifically relates to a switch. Background Technology

[0002] Switches, such as circuit breakers, are used in power distribution systems to distribute electrical energy and protect circuits. When abnormal conditions such as overload, short circuit, undervoltage, or grounding occur in the circuit, they are triggered by thermomagnetic / electronic tripping mechanisms to quickly disconnect the faulty circuit (also known as "fault current").

[0003] As is known in the industry, when a switch is under current-carrying conditions, an electric arc is generated when the moving and stationary contacts separate. Especially when breaking a short-circuit with a large current, the core temperature of the arc can reach tens of thousands of degrees Celsius, far exceeding the melting and boiling points of materials such as copper and silver alloys. This causes the metal on the contact surface to melt or even vaporize instantly, severely impacting the contacts. On the one hand, it reduces the service life of the contacts; on the other hand, the ablation and evaporation of the contact material reduces the insulation performance of the arc-extinguishing chamber. Specifically, metal vapor is injected into the arc-extinguishing chamber and adheres to the insulating walls, arc-extinguishing grids, and other components, forming conductive residues (such as copper particles or carbon deposits). Therefore, whether the arc root can quickly transfer from the contacts not only determines the breaking capacity of the switch but also the service life of the contacts, making it crucial to the overall breaking capacity and lifespan of the switch.

[0004] Numerous publicly available Chinese patent documents contain information related to solving the aforementioned technical problems. For example, some patents employ a shorting plate to rapidly transfer the arc root on the contact surface, thereby improving the switch's breaking capacity and service life. One end of the shorting plate extends above the arc-extinguishing chamber and corresponds to the outside of the moving contact's trajectory, while the other end connects to the tripping system. However, this method places the shorting plate and the arc-extinguishing chamber in the same mounting cavity, requiring the shorting plate to be insulated. This not only increases installation difficulty but also raises switch costs. For switches without additional redundant space within the arc-extinguishing chamber mounting cavity to install such a shorting plate, it is difficult to ensure that the contacts are protected from ablation and to improve the arc-extinguishing chamber's insulation performance. Utility Model Content

[0005] The present invention aims to provide a switch whose shorting plate has an independent space, has a simple structure, is easy to install and maintain, has low cost, and can effectively prevent the contacts from being burned and improve the insulation performance of the arc-extinguishing chamber.

[0006] The present invention accomplishes its objective as follows: a switch includes a housing, within which a pair of pole unit cavities and an intermediate cavity located between the pair of pole unit cavities are formed. Each pair of pole unit cavities is provided with a pole unit, which includes a moving contact, a stationary contact, a first terminal block connected to the moving contact, and an arc-extinguishing device for extinguishing the arc generated between the moving and stationary contacts. The switch also includes a shorting plate disposed in the intermediate cavity, with both ends of the shorting plate extending into the same pole unit cavity to electrically connect the first terminal block of the same pole unit to the top grid of the arc-extinguishing device.

[0007] In a specific embodiment of this utility model, the housing includes a base and a cover. A pair of base spacers are formed in the base, and a pair of cover spacers are formed on the side of the cover facing the base and at positions corresponding to the base spacers. After the cover and the base are spliced ​​together, the pair of cover spacers and the pair of base spacers separate the pair of pole unit cavities and the intermediate cavity located between the pair of pole unit cavities in the housing. A shorting plate through hole is provided on the cavity wall formed by the base spacers and the cover spacers for the shorting plate to be inserted from the intermediate cavity into the pole unit cavity.

[0008] In another specific embodiment of this utility model, the shorting plates are a pair with the same structure but opposite orientations. Each shorting plate includes a first connecting end, a second connecting end, and an intermediate conductor connecting the first connecting end and the second connecting end. The first connecting end extends from the intermediate cavity to the pole unit cavity through a hole in the shorting plate corresponding to the first terminal block and is electrically connected to the first terminal block. The second connecting end extends from the intermediate cavity to the pole unit cavity through a hole in the shorting plate corresponding to the arc extinguishing device and is connected to the top grid plate. The intermediate conductor is laid in the intermediate cavity.

[0009] In another specific embodiment of this utility model, the first connection end and the second connection end are both rigid conductors extending along the rotation axis of the switch moving contact, and the intermediate conductor is a rigid conductor extending at an equal distance from the cavity wall, with the intermediate conductors of a pair of shorting plates spaced apart from each other.

[0010] In another specific embodiment of this utility model, a main shaft cavity is further formed within the housing. The main shaft cavity extends along the rotation axis of the moving contact and passes through the pair of pole unit cavities and the intermediate cavity. A main shaft is provided within the main shaft cavity. The main shaft includes two moving contact shaft segments corresponding to the pair of pole unit cavities and an intermediate shaft segment located between the two moving contact shaft segments and corresponding to the intermediate cavity. A receiving cavity is radially formed on each of the two moving contact shaft segments and the intermediate shaft segment. The moving contact is provided in the receiving cavity on the moving contact shaft segment, and the intermediate conductor passes through the receiving cavity on the intermediate shaft segment.

[0011] In another specific embodiment of this utility model, a first cavity and a second cavity are formed on the base phase spacer plate. The first cavity and the second cavity are respectively located on the left end and the right end of the base phase spacer plate facing upward. After the base and the cover are spliced ​​together and the base phase spacer plate and the cover phase spacer plate are spliced ​​together correspondingly, the first cavity forms the shorting plate through hole corresponding to the position of the first terminal block, and the second cavity forms the shorting plate through hole corresponding to the position of the arc extinguishing device.

[0012] In a further specific embodiment of the present invention, the arc extinguishing device includes a pair of arc extinguishing chamber supports and an arc extinguishing grid plate group fixedly installed between the pair of arc extinguishing chamber supports. The grid plate located at the top of the arc extinguishing grid plate group constitutes the top grid plate. Each of the pair of arc extinguishing chamber supports is provided with a groove, which corresponds to the second cavity. The second connecting end passes through the second cavity and the groove in sequence, extends from the intermediate cavity to the pole unit cavity, and connects to the top grid plate.

[0013] In a further specific embodiment of the present invention, a pair of descending segments extend downward from the side of the top grid plate toward the moving contact, and an opening is formed between the pair of descending segments. The second connecting end is welded to one of the descending segments near the middle cavity.

[0014] In yet another specific embodiment of this utility model, the first terminal block includes a terminal block fixed end and a terminal block for wiring that protrudes from the housing. The moving contact has a contact end that protrudes from one side of the accommodating cavity for contacting or separating from the stationary contact and a moving contact fixed end that protrudes from the other side of the accommodating cavity and is fixed to the terminal block fixed end. The first connecting end is fixed to the terminal block fixed end or fixed to the moving contact fixed end.

[0015] The technical advantages of this invention are as follows: By placing the shorting plate within the intermediate cavity, with its two ends extending into the cavity of the same pole unit, the first terminal block of the same pole unit and the top grid plate of the arc-extinguishing device are electrically connected. This rational use of the intermediate cavity provides an independent installation and storage space for the shorting plate, which not only reflects the simplicity of the structure but also ensures convenient installation and maintenance, reduces costs, effectively prevents contact erosion, and improves the insulation performance of the arc-extinguishing chamber. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 To remove Figure 1 The diagram shows the three-dimensional structure of the cover and operating mechanism.

[0018] Figure 3 for Figure 1 and Figure 2 Detailed structural diagram of the base shown;

[0019] Figure 4 for Figure 1 and Figure 2 The bottom view of the cover is shown;

[0020] Figure 5 This is a cross-sectional view of the central cavity after the cover and base are joined together.

[0021] Figure 6 for Figure 5 A schematic diagram showing the installation of a shorting plate on the basis shown.

[0022] Figure 7 This is a structural diagram of a pair of shorting plates;

[0023] Figure 8 for Figure 1 and Figure 2 The diagram shows a detailed structural diagram of the arc-extinguishing device. Detailed Implementation

[0024] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0025] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 The location and state of the object are taken as examples, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0026] Please see Figure 1 and Figure 2 The diagram shows a housing 1, which contains a pair of pole unit cavities 2 arranged side by side along the rotation axis of the moving contact of the switch and an intermediate cavity 3 located between the pair of pole unit cavities 2. Each pair of pole unit cavities 2 is provided with a pole unit 4, which includes a moving contact 41, a stationary contact 42, a first terminal block 43 connected to the moving contact 41, and an arc extinguishing device 44 for extinguishing the arc generated between the moving and stationary contacts.

[0027] The key technical points of the technical solution provided by this utility model are as follows: the switch also includes a shorting plate 5 disposed in the intermediate cavity 3, the two ends of the shorting plate 5 respectively protruding into the same pole unit cavity 2, electrically connecting the first terminal block 43 of the same pole unit 4 and the top grid plate 441 of the arc extinguishing device 44.

[0028] The aforementioned housing 1 contains a pair of pole unit cavities 2 arranged side-by-side along the rotation axis of the switch's moving contact, and an intermediate cavity 3 located between the pair of pole unit cavities 2. This means that the pair of pole unit cavities 2 and the intermediate cavity 3 are arranged side-by-side along the length of the automatic contact drive shaft from front to rear (or "rear to front"), that is, from front to back (or "back to front") relative to the width direction (short side) of the base 11, with the intermediate cavity 3 located between the pair of pole unit cavities 2. In summary, this indicates that the base 11 has three cavities: two pole units 4 are located in two mounting cavities, which are the aforementioned pair of pole unit cavities 2, and one mounting cavity is the aforementioned intermediate cavity 3, which does not house the pole units 2.

[0029] Please see Figure 3 and Figure 4 And combined Figures 1 to 2 The aforementioned housing 1 includes the base 11 and cover 12 mentioned above. The base 11 has a pair of base spacer plates 111 spaced apart from each other. On the side of the cover 12 facing the base 11 and at a position corresponding to the base spacer plates 111, a pair of cover spacer plates 121 spaced apart from each other are formed. After the cover 12 and the base 11 are spliced ​​together, the pair of cover spacer plates 121 and the pair of base spacer plates 111 separate the aforementioned pair of pole unit cavities 2 and the aforementioned intermediate cavity 3 located between the pair of pole unit cavities 2 within the housing 1.

[0030] Please see Figure 5 A shorting plate through hole 131 is provided on the cavity wall 13 formed by the aforementioned base phase spacer 111 and cover phase spacer 121 for the aforementioned shorting plate 5 to be inserted from the intermediate cavity 3 into the pole unit cavity 2.

[0031] Please see Figures 6 to 7 And combined Figure 2 The aforementioned shorting plates 5 have a pair with the same structure but opposite orientations. Each shorting plate 5 includes a first connecting end 51, a second connecting end 52, and an intermediate conductor 53 connecting the first connecting end 51 and the second connecting end 52. The first connecting end 51 extends from the aforementioned intermediate cavity 3 to the aforementioned pole unit cavity 2 through the hole 131 via the shorting plate corresponding to the aforementioned first terminal block 43 and is electrically connected to the first terminal block 43. The aforementioned second connecting end 52 extends from the aforementioned intermediate cavity 3 to the pole unit cavity 2 through the hole 131 via the shorting plate corresponding to the aforementioned arc extinguishing device 44 and is connected to the aforementioned top grid plate 441. The intermediate conductor 53 is laid in the intermediate cavity 3.

[0032] In this embodiment, both the first connecting end 51 and the second connecting end 52 are rigid conductors extending along the rotation axis of the switch moving contact, and the intermediate conductor 53 is a rigid conductor extending at an equal distance from the cavity wall 13, with the intermediate conductors 53 of the pair of shorting plates 5 spaced apart from each other. In this embodiment, as... Figure 2 and Figure 7 As shown, the shorting plate 5 on the left connects the first terminal block 43 and the top grid plate 441 of the pole unit 4 in the pole unit cavity 2 on the left. Its first connection end 51 and second connection end 52 both extend to the left. The intermediate conductor 53 is located in the intermediate cavity 3 on the side closer to its corresponding pole unit 4, that is, the intermediate conductor 53 is close to the left cavity wall 13 of the intermediate cavity 3. The shorting plate 5 on the right connects the first terminal block 43 and the top grid plate 441 of the pole unit 4 in the pole unit cavity 2 on the right. Its first connection end 51 and second connection end 52 both extend to the right. The intermediate conductor 53 is located in the intermediate cavity 3 on the side closer to its corresponding pole unit 4, that is, the intermediate conductor 53 is close to the right cavity wall 13 of the intermediate cavity 3. Thus, the two intermediate conductors are spaced apart to ensure the electrical clearance between them.

[0033] A main shaft cavity 6 is also formed within the aforementioned housing 1. Figure 3 (As shown), the main shaft cavity 6 extends along the rotation axis of the moving contact and penetrates the aforementioned pair of pole unit cavities 2 and intermediate cavity 3. The main shaft cavity 6 contains a [structure / structure / etc.] Figures 1 to 2 and by Figures 5 to 6The schematic diagram shows the main shaft 7, which includes two moving contact shaft segments 71 corresponding to the aforementioned pair of pole unit cavities 2, and an intermediate shaft segment 72 located between the two moving contact shaft segments 71 and corresponding to the aforementioned intermediate cavity 3. A receiving cavity 73 is radially formed on each of the two moving contact shaft segments 71 and the aforementioned intermediate shaft segment 72. The aforementioned moving contact 41 is housed within the receiving cavity 73 on the moving contact shaft segment 71, and the aforementioned intermediate conductor 53 passes through the receiving cavity 73 on the intermediate shaft segment 72. Similarly, to ensure the electrical clearance between the intermediate conductors 53 of the two shorting plates 5, the intermediate conductor 53 on the left side is positioned as close as possible to the left side wall of the receiving cavity 73 on the intermediate shaft segment 72 without affecting the rotation of the main shaft 7, and the intermediate conductor 53 on the right side is positioned as close as possible to the right side wall of the receiving cavity 73 on the intermediate shaft segment 72 without affecting the rotation of the main shaft 7. Of course, if an insulating layer is wrapped around the two intermediate conductors 53 or insulating tape is wrapped around them, the positions of the two intermediate conductors 53 can be relatively arbitrary and do not need to be on the left or right. The operating mechanism 8, which is located on the upper part of the intermediate shaft section 72 and connected to the main shaft 7, Figure 1 (As shown) Drive the main shaft 7 to rotate, thereby causing the rotating side of the moving contact 41 to contact or separate from the stationary contact 42.

[0034] Please pay attention. Figure 3 A first cavity 1111 and a second cavity 1112 are formed on the aforementioned base spacer 111. The first and second cavities 1111 and 1112 are respectively located on the left and right sides of the base spacer 111 facing upward. After the base 11 and the cover 12 are spliced ​​together and the base spacer 111 and the cover spacer 121 are spliced ​​together in a corresponding manner, the first cavity 1111 forms the aforementioned shorting plate through hole 131 corresponding to the position of the aforementioned first terminal block 43, and the second cavity 1112 forms the aforementioned shorting plate through hole 131 corresponding to the position of the arc extinguishing device 44.

[0035] Please see Figure 8 The aforementioned arc-extinguishing device 44 for extinguishing the arc generated between the moving and stationary heads 41 and 42 includes a pair of opposing arc-extinguishing chamber supports 442 (i.e., a pair of arc-extinguishing grid supports) and an arc-extinguishing grid assembly 443 fixedly installed between the pair of arc-extinguishing chamber supports 442. The grid at the top of the aforementioned arc-extinguishing grid assembly 443 is configured as the aforementioned top grid 441. Each of the aforementioned pair of arc-extinguishing chamber supports 442 is provided with a groove 4421, which corresponds to the aforementioned second cavity 1112. The aforementioned second connecting end 52 passes through the second cavity 1112 and the groove 4421 in sequence, extending from the aforementioned intermediate cavity 3 to the aforementioned pole unit cavity 2 and connecting with the aforementioned top grid 441.

[0036] exist Figure 1The diagram also shows a second terminal block 45 connected to the stationary contact 42. The moving contact 41 moves between closed and open positions to contact and separate from the stationary contact 42 to achieve the connection and disconnection of the circuit. Figure 2 As shown, the stationary contact 42 is located in the area formed by... Figure 8 The bottom of the arc-extinguishing device 44 is shown in detail.

[0037] See Figure 2 and Figure 8 A pair of descending sections 4411 extend downward from the top grid plate 441 toward the moving contact 41, forming an opening 4412 between the pair of descending sections 4411. The second connecting end 52 connects to one of the descending sections 4411 near the intermediate cavity 3 (see...). Figure 2 In the middle, the right descending section of the left top grid plate 411 and the left descending section of the right top grid plate 411 are welded.

[0038] See Figure 2 The first terminal block 43 includes a terminal block fixed end 431 for connecting to the moving contact 41 and a terminal block 432 exposed in the housing 1 for wiring. The first connecting end 51 is fixed to the terminal block fixed end 431.

[0039] See Figure 1 and Figure 2 The moving contact 41 has a contact end 411 protruding from one side of the accommodating cavity 73 for contacting or separating from the stationary contact 42, and a moving contact fixing end 412 protruding from the other side of the accommodating cavity 73 and fixed to the terminal block fixing end 431. The contact end 411 is a rigid guide rod with a contact point fixed on it. The moving contact fixing end 412 is also a rigid conductive block. A flexible connection is provided between the rigid guide rod and the rigid conductive block (see...). Figure 1 , and Figure 2 (Soft links omitted).

[0040] A connection end 51 of the aforementioned shorting plate 5 is provided for supplying... Figure 2 The first connecting end fixing screw hole 511 (illustrated but not marked in the attached diagram) is used to fix the first connecting end fixing screw of the shorting plate. Figure 8 (See illustration). Furthermore, the end of the first connecting end 51, i.e., the part with the first connecting end fixing screw hole 511, is wider than other parts (wider than other parts), thereby helping to improve the strength of the first connecting end 51 of the shorting plate 5.

[0041] As described above, the shorting plate 5 electrically connects the first terminal block 43 of the same pole unit 4 and the top grid plate 441 of the arc extinguishing device 44. In the above embodiment, the first connecting end 51 of the shorting plate 5 is fixed to the first terminal block 43, and the second connecting end 52 of the shorting plate 5 is fixed to the top grid plate 441.

[0042] This invention utilizes the housing of a three-pole switch to install two pole units, meaning the contact arc-extinguishing system is installed only in the two cavities on either side, leaving the middle cavity empty for laying the shorting plate 5. This provides independent installation space for the shorting plate 5, facilitating installation and maintenance and improving work efficiency. Furthermore, by utilizing the base and cover of the three-pole switch, the number of parts is reduced, lowering production costs. Moreover, by setting the intermediate conductor 53 to extend close to its corresponding pole unit, the shorting plate does not need insulation wrapping, further simplifying installation and reducing costs. This invention provides independent installation space for the shorting plate 5, effectively preventing contact erosion and improving the insulation performance of the arc-extinguishing chamber.

[0043] Of course, this utility model is not limited to the embodiment shown in the figure. The intermediate conductor 53 may not pass through the accommodating cavity 73 on the intermediate shaft section 72. While ensuring the rotational movement of the main shaft 7, a space is reserved between the intermediate shaft section 72 and the bottom wall of the intermediate cavity 3 for the intermediate conductor 53 to pass through. Of course, the shorting plate 5 may not be a rigid conductor but a flexible connection. Of course, the shorting plate 5 may be composed of a conductor combining rigid conductors and flexible connections. For example, the two connecting ends are rigid while the intermediate conductor 53 is flexible. The connection between the shorting plate 5 and the top grid plate 441 can be fastened with screws, and the connection between the shorting plate 5 and the first terminal block 43 can be welded. The first connecting end 51 of the shorting plate 5 may not be fixed to the terminal block fixing end 431 of the first terminal block 43, but fixed to the moving contact fixing end 412. In the embodiments provided by this utility model, the terminal block fixing end 431 and the terminal 432 are an integral conductive block, and the moving contact fixing end 412 is fixed to the terminal block fixing end 431. Of course, the moving contact fixing end 412, the terminal block fixing end 431 and the terminal 432 can also be integrally cast to form the first terminal block 43, and the flexible connection of the moving contact is welded to the first terminal block 43. The first connection end 51 is fixed to the first terminal block 43.

Claims

1. A switch comprising a housing (1), wherein the housing (1) contains a pair of pole unit cavities (2) and an intermediate cavity (3) located between the pair of pole unit cavities (2), and each pair of pole unit cavities (2) contains a pole unit (4), the pole unit (4) comprising a moving contact (41), a stationary contact (42), a first terminal block (43) connected to the moving contact (41), and an arc extinguishing device (44) for extinguishing the arc generated between the moving and stationary contacts, characterized in that: The switch also includes a shorting plate (5) disposed in the intermediate cavity (3), the two ends of which are inserted into the same pole unit cavity (2) to electrically connect the first terminal block (43) of the same pole unit (4) and the top grid plate (441) of the arc extinguishing device (44).

2. A switch according to claim 1, characterized in that: The housing (1) includes a base (11) and a cover (12). The base (11) has a pair of base spacer plates (111) spaced apart from each other. On the side of the cover (12) facing the base (11) and at a position corresponding to the base spacer plates (111), a pair of cover spacer plates (121) spaced apart from each other are formed. After the cover (12) and the base (11) are spliced ​​together, the pair of cover spacer plates (121) and the pair of base spacer plates (111) separate the pair of pole unit cavities (2) and the intermediate cavity (3) located between the pair of pole unit cavities (2) in the housing (1). A shorting plate through hole (131) is provided on the cavity wall (13) formed by the base spacer plates (111) and the cover spacer plates (121) for the shorting plate (5) to enter the pole unit cavity (2) from the intermediate cavity (3).

3. A switch according to claim 2, characterized in that: The shorting plates (5) have a pair of identical structures but opposite orientations. Each shorting plate (5) includes a first connecting end (51), a second connecting end (52), and an intermediate conductor (53) connecting the first connecting end (51) and the second connecting end (52). The first connecting end (51) extends from the intermediate cavity (3) to the pole unit cavity (2) through a hole (131) of the shorting plate corresponding to the first terminal block (43) and is electrically connected to the first terminal block (43). The second connecting end (52) extends from the intermediate cavity (3) to the pole unit cavity (2) through a hole (131) of the shorting plate corresponding to the arc extinguishing device (44) and is connected to the top grid plate (441). The intermediate conductor (53) is laid in the intermediate cavity (3).

4. A switch according to claim 3, characterized in that: The first connection end (51) and the second connection end (52) are both rigid conductors extending along the rotation axis of the switch moving contact. The intermediate conductor (53) is a rigid conductor that extends at an equal distance from the cavity wall (13), and the intermediate conductors (53) of a pair of shorting plates (5) are spaced apart from each other.

5. A switch according to claim 4, characterized in that: A main shaft cavity (6) is also formed inside the housing (1). The main shaft cavity (6) extends along the rotation axis of the moving contact and passes through the pair of pole unit cavities (2) and the intermediate cavity (3). A main shaft (7) is provided inside the main shaft cavity (6). The main shaft (7) includes two moving contact shaft segments (71) corresponding to the pair of pole unit cavities (2) and an intermediate shaft segment (72) located between the two moving contact shaft segments (71) and corresponding to the intermediate cavity (3). A receiving cavity (73) is radially opened on the two moving contact shaft segments (71) and the intermediate shaft segment (72). The moving contact (41) is provided in the receiving cavity (73) on the moving contact shaft segment (71), and the intermediate conductor (53) passes through the receiving cavity (73) on the intermediate shaft segment (72).

6. A switch according to claim 3, characterized in that: A first cavity (1111) and a second cavity (1112) are formed on the base phase spacer plate (111). The first and second cavities (1111 and 1112) are located on the left and right sides of the base phase spacer plate (111) facing upwards, respectively. After the base (11) and the cover (12) are spliced ​​together and the base phase spacer plate (111) and the cover phase spacer plate (121) are spliced ​​together, the first cavity (1111) forms the shorting plate through hole (131) corresponding to the position of the first terminal block (43), and the second cavity (1112) forms the shorting plate through hole (131) corresponding to the position of the arc extinguishing device (44).

7. A switch according to claim 6, characterized in that: The arc extinguishing device (44) includes a pair of arc extinguishing chamber supports (442) and an arc extinguishing grid plate group (443) fixedly installed between the pair of arc extinguishing chamber supports (442). The grid plate at the top of the arc extinguishing grid plate group (443) constitutes the top grid plate (441). Each of the pair of arc extinguishing chamber supports (442) is provided with a groove (4421), which corresponds to the second cavity (1112). The second connecting end (52) passes through the second cavity (1112) and the groove (4421) in sequence, extends from the intermediate cavity (3) to the pole unit cavity (2), and is connected to the top grid plate (441).

8. A switch according to claim 7, characterized in that: A pair of descending segments (4411) extend downward on the side of the top grid plate (441) facing the moving contact (41), and an opening (4412) is formed between the pair of descending segments (4411). The second connecting end (52) is welded to one of the descending segments (4411) near the intermediate cavity (3).

9. A switch according to claim 5, characterized in that: The first terminal block (43) includes a terminal block fixed end (431) and a terminal block (432) exposed in the housing (1) for wiring. The moving contact (41) has a contact end (411) protruding from one side of the accommodating cavity (73) for contacting or separating from the stationary contact (42) and a moving contact fixed end (412) protruding from the other side of the accommodating cavity (73) and fixed to the terminal block fixed end (431). The first connecting end (51) is fixed to the terminal block fixed end (431) or to the moving contact fixed end (412).

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