A three-phase common box switch

Abstract

The present invention relates to a three-phase common box switch, comprising a housing, a three-phase contact structure is arranged in the housing, and an operating mechanism, the operating mechanism comprises a mechanism box and a power output end, the mechanism box is mounted on the housing; the operating mechanism has a driving shaft, the driving shaft is inserted into the housing through the outer seal of the housing; the driving shaft is provided with a power output part, the transmission rod is provided with a power input part, the power input part is located between a side phase contact structure and the middle phase contact structure; the power output part is connected to the power input part in a transmission manner, so that the driving shaft drives the transmission rod to rotate. The power output part on the driving shaft is connected to the power input part on the power transmission rod in a transmission manner. Since the power input part is located between a side phase contact structure and the middle phase contact structure, the transmission distance between the driving shaft and the middle phase contact structure and the side phase contact structure is reduced, and the transmission accuracy between the operating mechanism and each phase contact structure is improved.

Description

Technical Field

[0001] The invention relates to a three-phase common box switch. Background Art

[0002] High-voltage switchgear, especially GIS products, are gradually developing towards compactness. In particular, grid users have put forward standard spacing requirements. Under the premise of ensuring convenient product operation and maintenance, miniaturization of high-voltage switchgear has become the key. Existing GIS products mostly use three-phase common box and three-phase mechanical linkage to achieve product miniaturization design, such as Figure 1 As shown, in the prior art, a three-phase common box switch includes a shell, a three-phase contact structure is arranged inside the shell, two adjacent phases in the three-phase contact structure are connected by a transmission rod, an operating mechanism is arranged outside the shell next to one of the side phases of the three-phase contact structure, and the operating mechanism is connected by transmission to the side phase, but the distance between the operating mechanism and the contact structure is large, and an insulating rod for transmission needs to be added between the operating mechanism and the side phase contact structure, which has high cost, and the transmission distance between the output end of the operating mechanism and the side phase away from the operating mechanism is too long, and the transmission accuracy is poor. Summary of the invention

[0003] The object of the present invention is to provide a three-phase common box switch to solve the technical problem in the prior art that the transmission part between the operating mechanism and the contact structure is too long, resulting in poor transmission accuracy.

[0004] To achieve the above-mentioned purpose, the technical solution of the three-phase common box switch provided by the present invention is: a three-phase common box switch, comprising:

[0005] A housing, wherein a three-phase contact structure is provided in the housing, the three-phase contact structure comprising two side-phase contact structures and one middle-phase contact structure, wherein the moving contacts of the side-phase contact structure and the moving contacts of the middle-phase contact structure are connected by a transmission rod, so as to realize synchronous movement of the three-phase moving contacts when the transmission rod rotates;

[0006] An operating mechanism, the operating mechanism comprising a mechanism box and a power output end, the power output end driving the transmission rod to rotate;

[0007] The mechanism box is mounted on the housing;

[0008] The operating mechanism has a drive shaft, which is used as the power output end, and the drive shaft is sealed and inserted into the shell from the outside of the shell;

[0009] The driving shaft is provided with a power output part, the transmission rod is provided with a power input part, and the power input part is located between a side phase contact structure and the middle phase contact structure;

[0010] The power output part is in transmission connection with the power input part so that the driving shaft drives the driving rod to rotate.

[0011] The beneficial effect is that in the three-phase common box switch provided by the present invention, the mechanism box is directly installed on the shell, the drive shaft of the mechanism box as the power output end is directly sealed and penetrated into the shell, and the power output part on the drive shaft is transmission-connected with the power input part on the power transmission rod. Since the power input part is located between a side phase contact structure and a middle phase contact structure, this not only ensures the synchronous action of the three-phase moving contacts, but also reduces the transmission distance between the drive shaft and the middle phase contact structure and the side phase contact structure, and improves the transmission accuracy between the operating mechanism and each phase contact structure. In addition, the drive shaft is directly sealed and penetrated into the shell, which is convenient for adapting to the three-phase common box switch and reduces the impact on the sealing performance of the three-phase common box switch.

[0012] As a further improvement, the power input portion is located in the middle of the corresponding side phase contact structure and the middle phase contact structure.

[0013] The beneficial effect is that the power input part is located in the middle, so that the force on the transmission rod is relatively uniform, ensuring that the force on the transmission rod is relatively uniform and improving the rotation stability of the transmission rod.

[0014] As a further improvement, the drive shaft and the transmission rod are arranged crosswise, and the power output portion of the drive shaft and the power input portion of the transmission rod cooperate to form a worm gear transmission structure, or a gear transmission structure.

[0015] The beneficial effect is that the driving shaft and the transmission rod are arranged crosswise and form a worm gear transmission structure or a gear transmission structure, so that the internal transmission structure is simple, reliable and easy to implement.

[0016] As a further improvement, a support seat is provided on the inner wall of the shell, and the drive shaft has an inner support end, which extends into the shell, and the inner support end is rotatably supported and assembled on the support seat.

[0017] The beneficial effect is that the support seat on the shell provides rotation support for the inner support end of the drive shaft, which can reduce the radial runout during the rotation of the drive shaft and make the drive shaft rotate stably.

[0018] As a further improvement, the shell includes a shell body, in which the three-phase contact structure is arranged, a through hole is provided on the shell body, a cover plate is encapsulated at the position of the through hole, the mechanism box is installed on the outside of the cover plate, and the drive shaft seal passes through the cover plate.

[0019] The beneficial effect is that the shell comprises a shell body and a cover plate, the mechanism box is installed on the outside of the cover plate, and the drive shaft seal passes through the cover plate, the structure is simple, and the assembly of the mechanism box and the shell is convenient.

[0020] As a further improvement, the drive shaft and the cover plate are sealed together via a shaft sealing structure.

[0021] The beneficial effect is that a shaft sealing structure is arranged between the driving shaft and the sealing cover plate, which simplifies the difficulty of setting the sealing measures while effectively ensuring the sealing effect of the three-phase common box switch.

[0022] As a further improvement, the drive shaft and the transmission rod are arranged perpendicularly and crosswise.

[0023] The beneficial effect is that the drive shaft and the transmission rod are arranged vertically, which facilitates the installation of the drive shaft and prevents the gear structure on the drive shaft from being separated from the gear structure on the transmission rod.

[0024] As a further improvement, the drive shaft and the transmission rod extend in parallel, the power output portion of the drive shaft is a driving sprocket, the power input portion of the transmission rod is a driven sprocket, and the driving sprocket and the driven sprocket are connected by a chain transmission.

[0025] The beneficial effect is that the driving shaft drives the corresponding driving rod to rotate through the chain driving mechanism, and the overall structure is simple and easy to implement while ensuring the transmission accuracy.

[0026] As a further improvement, the shell includes a shell body, the shell body is provided with the three-phase contact structure, the shell body is provided with a through hole, the position of the through hole is encapsulated with a cover plate, the outer side of the cover plate is integrally or separately provided with a mounting shell, the mechanism box is fixedly mounted on the shell body or the mounting shell to fix the mechanism box on the shell, the drive shaft seal is inserted into the mounting shell, and the driving sprocket and chain are located in the mounting shell.

[0027] The beneficial effect is: a cover plate is arranged on the shell body, a mounting shell is arranged on the cover plate, the mechanism box is mounted on the shell body or the mounting shell, and the drive shaft seal is inserted into the mounting shell, the structure is simple, and the fixed assembly of the mechanism box and the shell is convenient.

[0028] As a further improvement, when the mechanism box is fixedly installed on the mounting shell, the mounting shell has a protruding support portion, the protruding extension direction of the protruding support portion is parallel to the extension direction of the transmission rod, the mechanism box is fixedly assembled with the protruding support portion, and the drive shaft seal penetrates into the protruding support portion, so that the drive shaft seal penetrates into the mounting shell.

[0029] The beneficial effect is that the protruding support part is arranged on the installation shell, which facilitates the assembly of the mechanism box and the installation shell, and at the same time, facilitates the parallel arrangement of the drive shaft and the transmission rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a structural schematic diagram of a three-phase common box switch in the prior art;

[0031] Figure 2 A schematic diagram of the structure of a three-phase common box switch provided by the present invention;

[0032] Figure 3 for Figure 2 Schematic diagram of the assembly of the middle drive shaft and the transmission rod;

[0033] Figure 4 This is a schematic structural diagram of Example 2 of the three-phase common box switch provided by the present invention.

[0034] Description of reference numerals:

[0035] Figures 1 to 3 In: 1. Shell; 11. Shell body; 12. Cover plate; 121. Mounting groove; 2. Left phase contact structure; 21. Middle phase contact structure; 22. Right phase contact structure; 3. Operating mechanism; 31. Mechanism box; 311. Insertion part; 4. Left transmission rod; 41. Right transmission rod; 410. Driven bevel gear; 5. Drive shaft; 51. Active bevel gear; 6. Support seat; 61. Support groove; 7. Sealing installation cylinder; 71. Y-type sealing ring; 72. Sealing installation hole; 8. Sealing cavity.

[0036] Figure 4 In: 1. Shell; 11. Shell body; 12. Cover plate; 13. Mounting shell; 130. Protruding support part; 2. Left phase contact structure; 21. Middle phase contact structure; 22. Right phase contact structure; 3. Operating mechanism; 31. Mechanism box; 4. Left transmission rod; 41. Right transmission rod; 411. Driven sprocket; 5. Drive shaft; 51. Active sprocket; 6. Y-type sealing ring; 7. Sealing cavity; 8. Chain. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0039] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "includes a ..." that may appear do not exclude the existence of other identical elements in the process, method, article or device that includes the elements.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The present invention is further described in detail below in conjunction with embodiments.

[0043] Embodiment 1 of the three-phase switch in one box provided in the present invention:

[0044] like Figure 1 As shown, in the prior art three-phase common box switch, the connecting rod mechanism between the operating mechanism and the hexagonal shaft as the transmission part is relatively long, so that the distance between the operating mechanism and the box body is relatively far, the transmission part is prone to radial runout, and most of the transmission part leaks into the atmosphere, which is not conducive to the sealing of the box body. In the three-phase common box switch provided by the present invention, the operating mechanism 3 is connected to the transmission rod between the side phase contact structure and the middle phase contact structure 21 in the three-phase contact structure, and the operating mechanism 3 is fitted and sealed with the outer shell 1 to reduce the interval between the operating mechanism 3 and the shell 1, so as to facilitate the sealing installation of the operating mechanism 3 and the shell 1.

[0045] like Figures 2 to 3 As shown, the three-phase common box switch includes a shell 1, in which a three-phase contact structure is arranged. The contact structures of each phase are connected by a transmission rod. An operating mechanism 3 is installed on the outer wall of the shell 1. The operating structure 3 is connected to the right transmission rod 41 through a driving shaft 5 to drive the three-phase contact structure to move synchronously.

[0046] The shell 1 includes a shell body 11, which extends in the left and right directions. A three-phase contact structure is arranged in the shell body 11. A support seat 6 is fixedly arranged on the inner wall of the rear side of the shell body 11. A support groove 61 is arranged on the support seat 6. The support groove 61 extends in the front-to-back direction to provide support for the rear end of the drive shaft 5 to rotate and insert, so as to increase the stability of the rotation of the drive shaft 5. A through hole is arranged on the front side of the shell body 11 to provide support for the drive shaft 5 to pass through, and a cover plate 12 is arranged at the position of the through hole. The cover plate 12 is bolted to the shell body 11 to form a complete shell 1, and the shell body 11 and the cover plate 12 form a sealed cavity 8 for the sealing installation cylinder 7 to extend into.

[0047] The front side of the cover plate 12 is provided with a mounting groove 121 recessed backwards for sealing installation of the mechanism box 31, and the rear side of the cover plate 12 is provided with a sealing mounting tube 7, which is extended from front to rear, and is provided with a sealing mounting hole 72, which passes through the cover plate 12 for the support and passage of the drive shaft 5. The sealing mounting tube 7 is also provided with a plurality of Y-shaped sealing rings, and the plurality of Y-shaped sealing rings 71 are sequentially mounted on the drive shaft 5 along the front-to-back direction to achieve sealing assembly of the drive shaft 5 and the cover plate 12, and the sealing mounting tube 7 extends backwards into the sealing cavity 8 to further increase the sealing performance between the drive shaft 5 and the cover plate 12.

[0048] The operating mechanism 3 includes a mechanism box 31, in which a driving component is arranged. The driving component drives the corresponding driving shaft 5 to rotate. The driving shaft 5 serves as the power output end of the operating mechanism and is used to output the opening and closing driving force to the three-phase contact structure of the three-phase common box switch.

[0049] The mechanism box 31 is located at the front side of the shell 1, and an insertion portion 311 is protruding from the rear side of the mechanism box 31. The insertion portion 311 is inserted into the installation groove 121 to form a pre-positioned assembly, which is convenient for the subsequent connection of the mechanism box 31 and the cover plate 12 by bolts.

[0050] The three-phase contact structure is respectively divided into a left-phase contact structure 2, a middle-phase contact structure 21 and a right-phase contact structure 22, wherein the left-phase contact structure 2 and the middle-phase contact structure 21 are connected by a left transmission rod 4, the right-phase contact structure 22 and the middle-phase contact structure 21 are connected by a right transmission rod 41, and the left transmission rod 4 and the right transmission rod 41 are connected by a transmission. In this way, when the drive shaft 5 drives the right transmission rod 41 to transmit, the left transmission rod 4 and the right transmission rod 41 move synchronously; a rack is provided on the moving contact of each phase contact structure for cooperating with the spur gear transmission on the left and right transmission rods, so that the moving contacts of the three-phase contact structure can move synchronously.

[0051] A left spur gear is provided at the left end of the left transmission rod 4, which is connected to the moving contact of the left phase contact structure 2 by means of a gear rack. A middle spur gear is provided at the right end of the left transmission rod 4, which is connected to the moving contact of the middle phase contact structure 21 by means of a gear rack, and is used to drive the moving contact of the middle phase contact structure 21 to move.

[0052] A driven bevel gear 410 is provided in the middle of the right transmission rod 41. The driven bevel gear 410 serves as the power input part of the transmission rod, so as to be engaged and transmitted with the active bevel gear 51 of the drive shaft 5. A right spur gear is provided at the right end of the right transmission rod 41, so as to be connected to the moving contact of the right phase contact structure 22 by means of a gear rack, so as to drive the moving contact of the right phase contact structure 22 to move.

[0053] In order to connect the left transmission rod 4 with the right transmission rod 41, a connecting block is provided between the left transmission rod 4 and the right transmission rod 41, and square grooves are provided on the left and right side surfaces of the connecting block. A left four-square block is provided at the right end of the left transmission rod 4, and a right four-square block is provided at the left end of the right transmission rod 41. The left four-square block is inserted into the left square groove of the connecting block, and the right four-square block is inserted into the right square groove of the connecting block, thereby completing the transmission connection between the left transmission rod 4 and the right transmission rod 41.

[0054] The driving shaft 5 extends in the front-to-back direction and is arranged perpendicularly to the right transmission rod 41. The front end of the driving shaft 5 is connected to the transmission of the operating mechanism 3 and is driven to rotate by the operating mechanism 3 to serve as the output end of the operating mechanism 3. The middle section of the driving shaft 5 extends into the shell body 11 through the cover plate 12. The rear end of the driving shaft 5 is inserted into the support groove 61. A driving bevel gear 51 is provided on the driving shaft 5. The driving bevel gear 51 is sleeved on the driving shaft 5 and is keyed to the driving shaft 5. The driving bevel gear 51 serves as the power output part of the driving shaft 5 to mesh with the driven bevel gear 410 as the power input part of the transmission rod. When the driving shaft 5 is driven to rotate by the operating structure 3, the driving bevel gear 51 rotates to drive the driven bevel gear 410 to rotate, so as to drive the transmission rod to rotate, and then drive the contact structures of each phase to act synchronously.

[0055] When the three-phase common box switch is closed, the operating mechanism 3 is started, and the operating mechanism 3 drives the driving shaft 5 to rotate. The rotating driving shaft 5 drives the active bevel gear 51 to rotate. When the active bevel gear 51 rotates, it drives the driven bevel gear 410 to rotate, and then drives the transmission rod to rotate. The spur gear on the transmission rod rotates with the transmission rod, so that the moving contacts of the three-phase contact structure can close synchronously.

[0056] When the three-phase common box switch is opened, the operating mechanism 3 is started, and the operating mechanism 3 drives the driving shaft 5 to reverse. The reversely rotating driving shaft 5 drives the active bevel gear 51 to reverse. When the active bevel gear 51 reverses, it drives the driven bevel gear 410 to reverse, and then drives the transmission rod to reverse. The spur gear on the transmission rod rotates with the transmission rod, so that the moving contacts of the three-phase contact structure can perform the opening action synchronously.

[0057] In the three-phase common-box switch provided by the present invention, the operating mechanism 3 is connected to the right transmission rod 41 between the right phase contact structure 22 and the middle phase contact structure 21, and the operating mechanism 3 is tightly and sealedly assembled with the shell 1 to reduce the transmission distance between the operating mechanism 3 and the contact structures of each phase, thereby improving the transmission accuracy between the operating mechanism 3 and the contact structure.

[0058] Embodiment 2 of the three-phase common box switch provided in the present invention:

[0059] The difference between this embodiment and embodiment 1 is that in embodiment 1, the drive shaft 5 and the transmission rod are arranged crosswise, and the driving bevel gear 51 as the power output part of the drive shaft 5 is meshed with the driven bevel gear 411 as the power input part of the transmission rod, so that when the drive shaft 5 rotates, the transmission rod is driven to rotate. In this embodiment, the drive shaft 5 and the transmission rod are arranged in parallel, and the drive shaft 5 and the transmission rod are connected through a sprocket chain transmission.

[0060] When implementing it, Figure 4As shown, in order to install the operating mechanism 3 on the housing 1, a mounting shell 13 is provided on the outer side of the cover plate 12, and the mounting shell 13 is bolted to the housing body 11. A protruding support portion 130 is provided on the mounting shell 13. The mechanism box 31 of the operating mechanism 3 is fixedly assembled with the protruding support portion 130, and can be assembled by flange connection. The protruding support portion 130 extends in the left and right directions, so that the end of the driving shaft 5 away from the operating mechanism 3 horizontally extends into the protruding support portion 130, and a plurality of Y-shaped sealing rings 6 are sleeved on the driving shaft 5, so that the driving shaft 5 and the protruding support portion 130 are sealed and rotatably assembled, and the end of the driving shaft 5 close to the operating mechanism 3 is transmission-connected with the operating mechanism 3 to serve as an operating mechanism. At the power output end of the driving mechanism 3, the end of the driving shaft 5 extending into the protruding support part 130 is provided with a driving sprocket 51, the driving sprocket 51 is sleeved on the driving shaft 5, and is key-connected and fixed to the driving shaft 5, and the driving sprocket 51 serves as the power output part of the driving shaft 5; a driven sprocket 411 is provided in the middle of the right transmission rod 41, and the driven sprocket 411 serves as the power input part of the transmission rod, and is connected to the driving sprocket 51 as the power output part of the driving shaft 5 through a chain 8. The chain 8 extends into the shell body 1 through the mounting shell 13. When the driving shaft 5 rotates, it drives the driving sprocket 51 to rotate, and the rotating driving sprocket 51 drives the driven sprocket 411 to rotate through the chain 8, thereby rotating the transmission rod.

[0061] Because the meshing accuracy between the sprocket and the chain is greater than the meshing accuracy between the two gears, compared with Example 1, more precise transmission can be achieved between the drive shaft 5 and the transmission rod in this embodiment.

[0062] Embodiment 3 of the three-phase switch in one box provided in the present invention:

[0063] The difference between this embodiment and embodiment 1 is that in embodiment 1, the left-phase contact structure 2 is connected to the middle-phase transmission structure through the left transmission rod 4, the right-phase contact structure 22 is connected to the middle-phase transmission structure through the right transmission rod 41, and the left transmission rod 4 is connected to the right transmission rod 41 through a square structure. In this embodiment, the transmission rod is designed as an integral unit, and spur gears are provided at the positions of the transmission rods corresponding to the contact structures of each phase, and each spur gear is matched with the rack transmission of the corresponding contact structure.

[0064] Embodiment 4 of the three-phase common box switch provided in the present invention:

[0065] The difference between this embodiment and embodiment 1 is that in embodiment 1, the driven bevel gear 410 is arranged in the middle of the right rotating rod. In this embodiment, the driven bevel gear 410 is arranged on the right transmission rod 41, which is biased towards the middle phase transmission structure, so as to reduce the transmission distance between the drive shaft 5 and the middle phase contact structure 21 and the left phase contact structure 2, and correspondingly improve the transmission accuracy between the drive shaft 5 and the middle phase contact structure 21 and the left phase contact structure 2, but the transmission accuracy between the drive shaft 5 and the right phase contact structure 22 will be reduced.

[0066] Embodiment 5 of the three-phase common box switch provided in the present invention:

[0067] The difference between this embodiment and embodiment 1 is that in embodiment 2, the mechanism box is installed on the protruding support portion. In this embodiment, the mechanism box is fixedly installed on the shell body, and specifically, a flange connection structure can be provided on another cover plate on the shell body to install the mechanism box, and at the same time, the driving shaft of the operating mechanism is sealed and penetrated into the protruding support portion to ensure that the driving shaft can normally drive the transmission rod to rotate.

[0068] In addition, in Embodiment 1, the mounting shell provided with the protruding support portion is integrally arranged on the cover plate. In this embodiment, the mounting shell can also be fixedly mounted on the cover plate by means of a flange connection structure.

[0069] Embodiment 6 of the three-phase switch in one box provided in the present invention:

[0070] The difference between this embodiment and embodiment 1 is that in embodiment 1, the active bevel gear 51 as the power output part of the drive shaft 5 is meshed with the driven bevel gear 411 as the power input part of the transmission rod, so that when the drive shaft 5 rotates, the transmission rod is driven to rotate. In this embodiment, a worm section is provided on the drive shaft 5, and the worm section serves as the power output part of the drive shaft 5. A worm wheel is provided in the middle of the right transmission rod 41, and the worm wheel serves as the power input part of the transmission rod. The worm and the worm wheel are meshed with each other for transmission. When the worm section of the drive shaft 5 rotates, the worm wheel is driven to rotate, thereby rotating the transmission rod.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A three-phase common box switch, comprising: The housing comprises a housing body, wherein the housing body is provided with a three-phase contact structure, wherein the three-phase contact structure comprises two side-phase contact structures and one middle-phase contact structure, wherein the moving contacts of the side-phase contact structure and the moving contacts of the middle-phase contact structure are connected by a transmission rod, so as to realize synchronous movement of the three-phase moving contacts when the transmission rod rotates; An operating mechanism, the operating mechanism comprising a mechanism box and a power output end, the power output end drives the transmission rod to rotate; Features: The mechanism box is mounted on the housing; The operating mechanism has a drive shaft, which is used as the power output end, and the drive shaft is sealed and inserted into the shell from the outside of the shell; The driving shaft is provided with a power output part, the transmission rod is provided with a power input part, and the power input part is located between a side phase contact structure and the middle phase contact structure; The power output part is transmission-connected with the power input part so that the drive shaft drives the transmission rod to rotate; a support seat is provided on the inner wall of the shell, the drive shaft has an inner support end, the inner support end extends into the shell, the inner support end is rotationally supported and assembled on the support seat, a through hole is provided on the shell body, a covering plate is encapsulated at the position of the through hole, the mechanism box is installed on the outside of the covering plate, and the drive shaft seal passes through the covering plate.

2. The three-phase switch in one box according to claim 1, characterized in that: The power input portion is located in the middle of the corresponding side phase contact structure and the middle phase contact structure.

3. The three-phase switch in one box according to claim 1 or 2, characterized in that: The drive shaft and the transmission rod are arranged crosswise, and the power output portion of the drive shaft and the power input portion of the transmission rod cooperate to form a worm gear transmission structure, or a gear transmission structure.

4. The three-phase switch in one box according to claim 1, characterized in that: The driving shaft and the cover plate are sealed together via a shaft sealing structure.

5. The three-phase switch in one box according to claim 3, characterized in that: The driving shaft and the transmission rod are arranged vertically and crosswise.

6. The three-phase switch in one box according to claim 1 or 2, characterized in that: The driving shaft and the transmission rod extend in parallel, the power output portion of the driving shaft is a driving sprocket, the power input portion of the transmission rod is a driven sprocket, and the driving sprocket and the driven sprocket are connected by chain transmission.

7. The three-phase switch in one box according to claim 6, characterized in that: The shell includes a shell body, in which the three-phase contact structure is arranged, and a through hole is arranged on the shell body. A cover plate is encapsulated at the position of the through hole, and a mounting shell is integrally or separately arranged on the outer side of the cover plate. The mechanism box is fixedly mounted on the shell body or the mounting shell to fix the mechanism box on the shell, the drive shaft seal is inserted into the mounting shell, and the driving sprocket and the chain are located in the mounting shell.

8. The three-phase switch in one box according to claim 7, characterized in that: When the mechanism box is fixedly installed on the mounting shell, the mounting shell has a protruding support portion, the protruding extension direction of the protruding support portion is parallel to the extension direction of the transmission rod, the mechanism box is fixedly assembled with the protruding support portion, and the drive shaft seal penetrates into the protruding support portion, so that the drive shaft seal penetrates into the mounting shell.

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