Combined switch device

Abstract

A combined switch device disclosed by the present application comprises a rack, vacuum arc extinguish chambers, isolation contacts, grounding contacts and a contact knife assembly, the rack is formed by splicing a plurality of insulating partition plates, a plurality of isolation cavities are formed in the rack, the vacuum arc extinguish chambers are vertically installed in the corresponding isolation cavities, and the bottom ends of the vacuum arc extinguish chambers are provided with static contacts; the isolation contact is installed at the bottom end of the rack through an insulated isolation cross beam, an isolation area corresponding to the isolation cavity is arranged on the isolation cross beam, the isolation contact is located in the corresponding isolation area, the grounding contact is installed at the bottom end of the rack and corresponds to the isolation cavity, and the contact knife assembly is rotatably installed at the bottom end of the rack through an isolation shaft. The beneficial effects of the invention are that the vacuum arc-extinguishing chambers between phases are physically isolated through the isolation cavities, and the isolation contacts between phases are physically isolated through the isolation regions at the same time, so that the dual isolation design greatly blocks the inter-phase conductive paths in space, i.e., the inter-phase insulation electric field is greatly improved, and the reliability of the vacuum arc-extinguishing chamber is improved. And the insulating property of the combined switch equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a combined switch device. BACKGROUND

[0002] In the existing switch cabinet, a three-position combined switch device is mostly used, which integrates a vacuum circuit breaker, an isolation switch, and a grounding switch. The so-called three-position refers to three working positions: one is the closed position of the main breaking point of the isolation switch, the second is the isolation position of the separated main breaking point, and the third is the grounding position of the grounding side.

[0003] In the switch cabinet, in order to ensure its insulation, SF6 (sulfur hexafluoride gas) is filled in the box where the combined switch is installed. SF6 has good insulation performance and arc extinguishing performance. Therefore, the physical insulation isolation of each switch during installation is not ideal, especially in compact switch devices, the local electric field strength may exceed the tolerance limit of SF6 gas, causing discharge or even breakdown accidents, threatening the safe operation of the device. Therefore, how to increase the insulation performance of the existing switch device to overcome the above problems is a problem that needs to be solved by those skilled in the art. SUMMARY

[0004] One of the purposes of the present application is to provide a combined switch device capable of improving insulation performance.

[0005] To achieve the above purposes, the technical solution adopted by the present application is as follows: a combined switch device, comprising a rack, a vacuum arc-extinguishing chamber, an isolation contact, a grounding contact, and a contact knife assembly, the rack is spliced by a plurality of insulation partitions and forms a plurality of isolation cavities inside, the vacuum arc-extinguishing chamber is vertically installed corresponding to the isolation cavities and has a static contact at the bottom end, the isolation contact is installed at the bottom end of the rack through an insulation isolation beam, the isolation beam is provided with an isolation area corresponding to the isolation cavities, the isolation contact is located in the isolation area, the grounding contact is installed at the bottom end of the rack and corresponds to the isolation cavities, and the contact knife assembly is rotatably installed at the bottom end of the rack through an isolation shaft; when closing, the first end of the contact knife assembly cooperates with the static contact and is located in the isolation cavity, and the second end of the contact knife assembly cooperates with the isolation contact and is located in the isolation area.

[0006] Preferably, the rack comprises an isolation front plate, an isolation rear plate, a pair of side plates, and a plurality of three-phase partitions, the two ends of the two side plates are respectively connected and matched by the isolation front plate and the isolation rear plate, the three-phase partitions are installed between the two side plates, and the isolation cavities are formed between adjacent three-phase partitions.

[0007] Preferably, a plurality of partition plate sets are mounted on the outer part of the isolation crossbeam at intervals, each of the partition plate sets comprising a plurality of partition plate bodies arranged at equal intervals between adjacent partition plate bodies, and the partition plate sets are located on both sides of the isolation contact to form the isolation area.

[0008] Preferably, a plurality of insulating cylinders I are arranged at the bottom end of the isolation crossbeam, the insulating cylinders I are arranged at the bottom end positions corresponding to the isolation contacts, and the insulating cylinders I are provided with avoiding openings for line connection of the isolation contacts, and the avoiding openings are located corresponding to the side part of the isolation crossbeam.

[0009] Preferably, the static contact comprises a contact plate and a head body arranged at the bottom end of the contact plate, the bottom end of the contact plate is provided with an insulating plate covering the connection member, and the bottom end of the insulating plate is provided with an insulating cylinder II covering the connection member.

[0010] Preferably, the three-phase partition plate extends outward to form a plug-in part near the side part of the side plate, and the outer side of the side plate is provided with a plug-in groove; when the three-phase partition plate is installed, the plug-in part cooperates with the plug-in groove, and the side plate cooperates with the three-phase partition plate.

[0011] Preferably, the isolation shaft comprises a shaft body and a mounting seat, and the contact blade assembly is mounted on the shaft body; the mounting seat is of an insulating structure, the mounting seat is arranged outside the shaft body and covers the contact blade assembly, and the end part of the contact blade assembly extends out of the mounting seat.

[0012] Preferably, the isolation shaft is integrally injection molded by plastic, and the shaft body is of a hollow structure; the outer circumferential surface of the shaft body is inwardly recessed to form a plurality of annular grooves, and a reinforcing ring is formed between adjacent annular grooves.

[0013] Preferably, the contact blade assembly is of a double-break structure and the included angle between the two ends is θ, wherein 90°<θ<150°, the contact blade assembly comprises a lap plate and a pair of contact blades; the mounting seat is provided with a mounting cavity, and a slot opening communicating with the mounting cavity is further formed in the mounting seat; the lap plate is mounted in the mounting cavity, the contact blades are adapted to be plugged into the slot opening and connected with the end part of the lap plate; and the mounting seat is detachably provided with an insulating cover, and the cover is adapted to cover the mounting cavity.

[0014] Preferably, the combined switchgear further comprises a balancing assembly mounted on the isolation shaft, and the balancing assembly is located at a circumferential direction different from the contact blade assembly; when the isolation shaft rotates, the wind area of the balancing assembly is larger than the wind area of the contact blade assembly, and the balancing assembly is adapted to balance the gravity of the contact blade assembly through air resistance.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention provides multiple isolation cavities in an insulating frame and multiple isolation areas on an insulating isolation beam. That is, the vacuum interrupter chambers between each phase are physically isolated by the isolation cavity, and the isolation contacts between each phase are also physically isolated by the isolation area. This double isolation design greatly blocks the inter-phase conductive path in space, that is, significantly improves the inter-phase insulation electric field, and improves the insulation performance of the combined switchgear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of one side of the combination switch of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of the other side of the combination switch of the present invention.

[0018] Figure 3 It is a side structural schematic diagram of the present invention.

[0019] Figure 4 For the present invention Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle.

[0020] Figure 5 For the present invention Figure 3 Schematic diagram of the cross-sectional structure at BB in the middle.

[0021] Figure 6 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0022] Figure 7 This is a schematic diagram of the main shaft and fixed plate after being disassembled according to the present invention.

[0023] Figure 8 This is an enlarged structural diagram of point B of the present invention.

[0024] Figure 9 It is a schematic diagram of the three-dimensional structure of the bottom end of the vacuum interrupter of the present invention.

[0025] Figure 10 It is a schematic diagram of the enlarged structure of point C of the present invention.

[0026] Figure 11 Schematic diagram of the specific structure of the ground contact of the present invention.

[0027] Figure 12 Schematic diagram of the isolation of the present invention.

[0028] Figure 13 It is a schematic diagram of the isolation of the present invention.

[0029] Figure 14 Schematic diagram of the grounding of the present invention.

[0030] Figure 15 The schematic diagram of the rack explosion structure of the present application.

[0031] Figure 16 The schematic diagram of the isolation crossbeam specific structure of the present application.

[0032] Figure 17 The schematic diagram of the isolation shaft overall structure of the present application.

[0033] Figure 18 The schematic diagram of the contact blade assembly and the balance assembly after being detached from the isolation shaft of the present application.

[0034] Figure 19 The schematic diagram of the D place enlarged structure of the present application.

[0035] Figure 20 The schematic diagram of the contact blade assembly specific structure of the present application.

[0036] Figure 21 The schematic diagram of the balance assembly specific structure of the present application.

[0037] Figure 22 The schematic diagram of the isolation shaft along the axial section structure of the present application.

[0038] Figure 23 The schematic diagram of the isolation shaft side section structure of the present application.

[0039] Figure 24 The schematic diagram of the E place enlarged structure of the present application.

[0040] In the figure: 1, rack; 101, isolation front plate; 102, isolation back plate; 103, side plate; 104, breaker front plate; 105, three-phase partition plate; 2, vacuum interrupter; 201, static contact; 202, dynamic contact; 3, isolation cavity; 4, isolation shaft; 401, shaft body; 402, mounting seat; 5, grounding crossbeam; 6, isolation contact; 7, isolation crossbeam; 8, main shaft; 9, fixed plate; 10, guide structure; 1001, guide block; 1002, guide groove; 11, insulating pull rod; 12, contact blade assembly; 1201, contact blade; 1202, lap plate; 13, grounding contact; 14, bolt protection cover; 15, support frame; 16, elastic pad; 17, insulating plate; 18, insulating cylinder two; 19, rack body; 20, bolt protection cover; 21, grounding copper bar; 22, isolation area; 23, partition plate group; 2301, partition plate body; 24, insulating cylinder one; 25, avoidance opening; 26, balance assembly; 2601, cover body; 2602, fan blade; 27, annular groove; 28, reinforcing ring; 29, fixed bent plate; 30, notch; 31, reinforcing rib; 32, mounting part; 33, shielding sleeve; 34, clamping block; 35, clamping plate; 36, bolt insert; 37, mounting cavity; 38, clamping groove. DETAILED DESCRIPTION

[0041] Hereinafter, the present application will be further described in conjunction with the specific embodiments, and it should be noted that the embodiments described below or the technical features between the embodiments can be combined in any manner to form new embodiments without conflict.

[0042] In the description of the present application, it should be noted that for orientation words such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0044] One of the preferred embodiments of the present application is shown in Figures 1 to 24 A combined switchgear, comprising a rack 1, vacuum interrupters 2, isolation contacts 6, grounding contacts 13 and a contact blade assembly 12, wherein the rack 1 is spliced by a plurality of insulating partitions and forms a plurality of isolation cavities 3 inside, and the vacuum interrupters 2 are vertically installed in the corresponding isolation cavities 3 and have stationary contacts 201 at the bottom end, the isolation contacts 6 are installed at the bottom end of the rack 1 through an isolation crossbeam 7, the isolation crossbeam 7 is provided with isolation zones 22 corresponding to the isolation cavities 3, the isolation contacts 6 are located in the corresponding isolation zones 22, and the grounding contacts 13 are installed at the bottom end of the rack 1 and correspond to the isolation cavities 3; the contact blade assembly 12 is rotatably installed at the bottom end of the rack 1 through an isolation shaft 4.

[0045] It can be understood that the vacuum interrupters 2 between each phase are physically isolated by the isolation cavities 3, and the isolation contacts 6 between each phase are also physically isolated by the isolation zones 22; and when closing, the first end of the contact blade assembly 12 cooperates with the stationary contacts 201 and is located in the isolation cavities 3, and the second end of the contact blade assembly 12 cooperates with the isolation contacts 6 and is located in the isolation zones 22, thereby ensuring the insulation isolation performance between each phase when closing. This double isolation design greatly blocks the phase-to-phase conduction path in space, i.e. greatly improves the phase-to-phase insulation electric field, and improves the insulation performance of the combined switchgear.

[0046] In this embodiment, as Figure 15As shown, the rack 1 comprises an isolation front plate 101, an isolation rear plate 102, a pair of side plates 103, and a plurality of three-phase partition plates 105. The two ends of the two side plates 103 are respectively connected and matched by the isolation front plate 101 and the isolation rear plate 102. The three-phase partition plates 105 are installed between the two side plates 103, and the isolation cavities 3 are formed between adjacent three-phase partition plates 105.

[0047] Specifically, as shown in Figure 1 and Figure 2 , the isolation front plate 101, the isolation rear plate 102, and the pair of side plates 103 are assembled in a rectangular form. The three-phase partition plates 105 are equidistantly arranged inside. Since the switch is three-phase, the number of three-phase partition plates 105 is preferably three. The isolation cavities 3 for installing the three vacuum interrupters 2 are formed between adjacent three-phase partition plates 105, as shown in Figure 15 .

[0048] As shown in Figure 1 and Figure 2 , the two ends of the isolation shaft 4 are rotatably installed between the isolation front plate 101 and the isolation rear plate 102, and the isolation shaft 4 is located below the side plate 103. The purpose of this design is that we know that the width (or thickness) of the vacuum interrupter 2 is not very large, so the distance between the two side plates 103 is also not very large, which only needs to be adapted to the installation of the vacuum interrupter 2. The static contact 201, the isolation contact 6, and the grounding contact 13 are distributed in a circle around the axis of the isolation shaft 4, and the lower end of the interior of the rack 1 needs enough space for installation. The installation space must be larger than the width (or thickness) space required by the vacuum interrupter 2. Therefore, if the static contact 201 and the grounding contact 13 are designed to be located in the two side plates 103, the distance between the two side plates 103 needs to be larger, which will increase the space of the entire device and is not convenient for miniaturization design.

[0049] Therefore, the isolation shaft 4 is designed to be located below the side plate 103, so that the distance between the two side plates 103 will not be affected. Specifically, the installation space between the isolation front plate 101 and the isolation rear plate 102 is adaptively increased, and the installation space between the two side plates 103 is used for installing the vacuum interrupter 2. As shown in Figure 1 and Figure 2 , the lower part of the entire rack 1 occupies a larger space, and the upper part of the rack 1 occupies a smaller space. This design is more reasonable and compact.

[0050] In addition, the isolation front plate 101 and the isolation rear plate 102 not only facilitate the installation of specific components in the isolation switch, but also bear the load-bearing function of the skeleton of the entire rack 1; and the entire rack 1 can be assembled by four plates, with a simple structure and easy installation and disassembly, which is conducive to subsequent maintenance and inspection work.

[0051] The present application does not specifically limit the structure of the three-phase partition plate 105. A specific embodiment is provided below for reference: like Figure 5 and Figure 15 As shown, the three-phase separator 105 has an overall "earth"-shaped structure, comprising an integrally formed vertical section, an upper horizontal section, and a lower horizontal section. The lower horizontal section is located at the bottom of the vertical section, and the upper horizontal section is located in the middle of the vertical section. During assembly of the rack 1, the upper and lower horizontal sections are both inserted into the slots of the two side panels 103, while the vertical section abuts between the two side panels 103. In other words, after rack 1 is assembled, the width of the vertical section is the width of the space within the rack 1, and the vacuum interrupter 2 is located between the two vertical sections, thereby achieving insulation isolation between each phase.

[0052] Of course, the specific structure of the three-phase partition 105 is not limited to the "earth"-shaped structure mentioned above. As long as it extends outward near the outer side of the side panel 103 to form a plug-in portion, the plug-in portion and the side panel 103 can be plugged in and matched to achieve quick disassembly and assembly during installation.

[0053] Further, such as Figure 5 As shown, the upper horizontal segment corresponds to the moving contact 202 at the top of the vacuum interrupter 2, and the lower horizontal segment corresponds to the static contact 201. As we know, the two contacts of the vacuum interrupter 2 are the areas for circuit connection. Therefore, isolating adjacent contacts by longer horizontal segments can greatly improve the insulation strength between adjacent contacts and prevent short circuits between adjacent phases.

[0054] It is worth mentioning that the plug-in installation of the three-phase partition 105 can not only play the role of insulation isolation, but also have the following effects: ① Strengthen the strength of the entire rack 1; Specifically, after the two side panels 103 are installed, they are supported on both sides of the three-phase partition 105, which can prevent the two side panels 103 from being squeezed and deformed inward. ② Facilitate loading and unloading; Specifically, no fixing parts (such as bolts) are required in the early assembly and later disassembly, thereby greatly improving work efficiency. ③ Perform pre-positioning for installation; Specifically, when assembling the rack 1, the two side panels 103 can be sleeved and supported on both sides of the three-phase partition 105, that is, the upper horizontal section and the lower horizontal section of the three-phase partition 105 both play a pre-positioning role, ensuring that the two side panels 103 are parallel to each other and the spacing is uniform, thereby further improving installation efficiency.

[0055] In one embodiment of the present application, Figure 2 and Figure 16 As shown in (a) , a plurality of separation plate groups 23 are installed at intervals outside the isolation beam 7 . The separation plate groups 23 are located on both sides of the isolation contact 6 to form an isolation area 22 .

[0056] It can be understood that, through the design of the insulating partition plate group 23, each isolation contact 6 can be insulated and isolated, thereby avoiding the occurrence of short circuits between adjacent isolation contacts 6. Specifically, the partition plate group 23 includes a plurality of partition plate bodies 2301, and the plurality of partition plate bodies 2301 are arranged at equal distances to further improve the insulation performance. Of course, the design of the partition plate body 2301 also has the following effects: ① The partition plate body 2301 and the isolation beam 7 can be connected by a reinforcing rib 31, which can improve the stability of the installation of the partition plate body 2301 on the one hand, and on the other hand, the partition plate body 2301 can further enhance the strength of the entire isolation beam 7; and the isolation beam 7 itself can also increase the stability of the entire rack 1. ② The design of multiple partition plate bodies 2301 can increase the contact range with the gas, thereby improving the heat dissipation performance at the isolation contact 6, and ensuring the safe and stable operation of the equipment. ③ The equidistant spacing of the partition plate body 2301 also helps to maintain the uniformity of heat dissipation and prevent the occurrence of local overheating. ④ This multi-plate arrangement design is also convenient for later maintenance and inspection work, and can quickly locate the component position of the isolation contact 6, thereby improving work efficiency. ⑤ As shown in the figure, the partition plate group 23 and the three-phase partition plate 105 are matched with each other, and the corresponding contact blade assembly 12 can be isolated, thereby further improving the insulation isolation effect. In addition, this corresponding matching design between the partition plate group 23 and the three-phase partition plate 105 also makes the structure of the entire rack 1 more compact and reasonable, effectively utilizes the space within the rack 1, and avoids unnecessary waste of space. In summary, the specific design of the isolation beam 7 fully considers the needs of actual applications, and through reasonable layout and structural design, it achieves the goals of miniaturization, high insulation strength, high stability and easy maintenance.

[0057] Furthermore, in order to achieve a better insulation effect on the isolation beam 7, as shown in FIG. Figure 16 As shown in (b), a plurality of insulating cylinders 24 are provided at the bottom end of the isolation beam 7, that is, the insulating cylinders 24 correspond to the isolation contacts 6, and the insulating cylinders 24 are covered at the bottom end of the isolation contacts 6; of course, in order to facilitate the connection between the line and the isolation contact 6, an avoidance opening 25 can be provided on the side of the insulating cylinder 24, so that the staff can connect the line by avoiding the avoidance opening 25; it not only ensures the insulation performance of the isolation contact 6, but also facilitates the connection of the line, thereby improving the practicality and convenience of the equipment.

[0058] It should be noted that the position of the avoidance port 25 corresponds to the side of the isolation beam 7, that is, the adjacent avoidance ports 25 are not relatively designed, which can avoid interference between adjacent lines, further improving the safety and stability of the equipment. In order to facilitate the overall production of the isolation beam 7, the isolation beam 7, the partition plate group 23 and the insulating cylinder 24 can be integrally injection molded by insulating plastic, thereby greatly improving the insulation effect. In addition, the design of the insulating cylinder 24 also has the advantages that the insulating cylinder 24 can also protect the isolation contact 6 from being damaged due to accidental touch or external force impact during the later maintenance operation of the staff, thereby improving the reliability and safety of the equipment.

[0059] Based on the above embodiment, a similar insulation structure can also be used at the bottom end of the static contact 201, as shown in Figure 8 and Figure 9 The static contact 201 includes a contact plate and a head body, and the head body is arranged at the bottom end of the contact plate. It should be understood that the contact plate is for the installation of the static contact 201, and the head body is a component for subsequent power-on and power-off. Therefore, the insulation and isolation of the contact plate are very important. Further, an insulating plate 17 can be installed at the bottom end of the contact plate through a connecting piece (generally a bolt), and the bottom end of the insulating plate 17 is provided with an insulating cylinder 18 for covering the connecting piece.

[0060] Specifically, the insulating cylinder 18 and the insulating plate 17 can also be integrally injection molded by plastic, and the installed bolt is located in the insulating cylinder 18, that is, the insulating cylinder 18 covers the bottom end position of the static contact 201. The design of the insulating plate 17 and the insulating cylinder 18 not only improves the insulation performance of the static contact 201, but also effectively prevents the short circuit risk caused by the direct exposure of the bolt mounting part. Of course, the insulating cylinder 18 and the insulating cylinder 24 can also have a protective effect.

[0061] Further, in order to prevent the contact blade assembly 12 from contacting the insulating cylinder 18 during closing, as shown in Figure 9 , an elastic pad 16 can be installed at the position corresponding to the head body at the bottom end of the insulating plate 17 through a frame body 19. When the contact blade assembly 12 cooperates with the static contact 201, the contact blade assembly 12 will abut against the elastic pad 16. Of course, the elastic pad 16 also has the following advantages: ① The elastic pad 16 can be made of insulating flexible materials such as rubber and resin, thereby providing a buffering effect when the contact blade assembly 12 is closed, reducing the impact and wear between the contact blade assembly 12 and the static contact 201, and prolonging the service life of the equipment. ② Since the installation position of the elastic pad 16 is fixed, when the contact blade assembly 12 cooperates with the static contact 201, it reaches the maximum rotation angle of the contact blade assembly 12, that is, the elastic pad 16 can limit the contact blade assembly 12, thereby improving the stability and safety of the equipment.

[0062] In this embodiment, as shown in Figure 11 The grounding contact 13 includes a grounding crossbeam 5, a grounding copper bar 21 and the grounding contact 13, both ends of the grounding crossbeam 5 are fixedly installed between the isolation front plate 101 and the isolation back plate 102 by bolts, and the grounding contact 13 is installed in the grounding crossbeam 5 through the grounding copper bar 21; it should be understood that the contact blade assembly 12 cooperates with the grounding contact 13 when grounding is performed. Of course, the grounding crossbeam 5 is also installed in the isolation front plate 101 and the isolation back plate 102, which further improves the installation strength of the rack 1.

[0063] In one embodiment of the present application, as shown in Figure 6 The main shaft 8 is horizontally rotatably installed at the upper end of the inside of the rack 1, a plurality of fixed plates 9 are installed outside the main shaft 8, and the fixed plates 9 cooperate with the moving contact 202 of the corresponding vacuum interrupter 2 through the guide structure 10. It can be understood that the main shaft 8 can drive the fixed plate 9 to rotate, and the fixed plate 9 drives the moving contact 202 to cooperate with the fixed contact 201 through the guide structure 10, thereby realizing the on-off of the vacuum interrupter 2.

[0064] Specifically, the main shaft 8 can be installed in the following manner: as shown in Figure 7 and Figure 15 The support frame 15 is bolted to the upper side of the opposite side of the two side plates 103, the fixed plate 9 is rotatably installed in the support frame 15, and the main shaft 8 can be inserted into the fixed plate 9 and fixed; of course, the circuit breaker front plate 104 can be bolted to the upper side of the end of the two side plates 103, thereby rotatably installing one end of the main shaft 8 in the circuit breaker front plate 104; this can ensure the stable installation of the main shaft 8, and also improve the strength of the rack 1. In order to improve the insulation protection performance, a bolt protection cover 14 can be installed at the bolt, of course, it is not limited to the installation here, and the same bolt protection cover 14 can be used for protection at the place where the bolt needs to be installed in other parts of the circuit breaker; for example, in Figure 11 The bolt for installing the grounding copper bar 21 and the grounding contact 13 can be protected by the bolt protection cover 20.

[0065] The structure of the guide structure 10 is not limited in the present application, and the following provides a specific embodiment for reference: The guide structure 10 comprises a guide groove 1002 and a guide block 1001, wherein the guide groove 1002 is arranged outside the fixed plate 9, the guide block 1001 is connected with the movable contact 202 through the insulating pull rod 11, and the guide groove 1002 cooperates with the guide block 1001. It can be understood that when the main shaft 8 drives the fixed plate 9 to rotate, the guide groove 1002 will rotate at this time, and the guide groove 1002 will drag the guide block 1001 to move up and down, thereby enabling the movable contact 202 to move to realize the on-off of the vacuum interrupter 2. It should be noted that in the prior art, the opening and closing of the movable contact 202 generally needs to be driven through multiple crank arms, and the application can effectively realize the on-off operation of the circuit breaker through the cooperation of the guide groove 1002 and the guide block 1001, thereby improving the transmission efficiency and reducing the complexity of the structure.

[0066] In addition, the inventor of the application finds that when the isolation shaft 4 rotates, there is also such a problem as Figure 13 and Figure 23 shown, the double-break contact blade assembly 12 is installed on the isolation shaft 4 and is in the closed state, and the angle between the two contact blades 1201 is 120°. As can be clearly seen from the figure, at this time, the gravity of the isolation shaft 4 is not evenly distributed (i.e., the center of gravity is on the left), and we will take the example of counterclockwise rotation of the isolation shaft 4 to open the circuit breaker: when the isolation shaft 4 rotates from the Figure 13 position to the Figure 12 position (rotates by 60 degrees), the center of gravity is not at the vertical position, and the gravity will generate a torque that is biased towards the isolation shaft 4. The torque direction always tries to pull the center of gravity to the lowest point, resulting in: for the upper contact blade 1201, the gravity torque is the same as the rotation direction when it rotates from the high position to the low position, which pushes the rotating shaft to accelerate. For the lower contact blade 1201, the gravity torque is the same as the rotation direction when it rotates from the high position to the low position, which pushes the isolation shaft 4 to accelerate; when it passes the lowest point and rotates from the low position to the high position, the gravity torque is opposite to the rotation direction, which plays a braking role.

[0067] Specifically, only the circumferential component of the gravity provides the acceleration or inhibition effect (i.e., produces tangential acceleration), and the resultant force of the gravity of the two contact blades 1201 in the contact blade assembly 12 always drives the isolation shaft 4 to accelerate, which will cause the phenomenon of overshoot of the isolation shaft 4, affecting the stability during opening.

[0068] In order to solve the above technical problems, as shown in Figure 17 , a balance assembly 26 can also be installed on the isolation shaft 4, and of course the balance assembly 26 is arranged in a staggered manner with the contact blade assembly 12 in the circumferential direction, which is to prevent interference between the balance assembly 26 and the contact blade assembly 12, and to better enable the balance assembly 26 to function.

[0069] It is understandable that if Figure 2 As shown, when the isolation shaft 4 rotates, the balancing component 26 will come into contact with the airflow, and the windward area of ​​the balancing component 26 is larger than the windward area of ​​the contact knife component 12, and the air resistance generated by the airflow will hinder and suppress the rotation of the isolation shaft 4, that is, the gravity effect of the contact knife component 12 during rotation is balanced by the air resistance to achieve the stability of the isolation shaft 4 during rotation, thereby reducing the impact of overshoot.

[0070] It should be known that in the prior art, those skilled in the art generally perform a static balancing design on the isolation shaft 4, that is, a counterweight or a symmetrical arm structure is installed at a symmetrical position where the center of gravity of the isolation shaft 4 is offset, thereby eliminating the eccentricity and reducing the moment of inertia. However, this design has the following disadvantages: it will increase the weight or volume of the entire isolation shaft 4, which requires adaptive improvement of the strength or space of the isolation switch equipment, and increases the manufacturing cost. The balancing component 26 of the present application balances the gravity of the contact blade component 12 through the air resistance during rotation, that is, it only needs to ensure that there is sufficient contact area with the gas during rotation, so there is no need to add too much mass or volume to balance the isolation shaft 4, thereby ensuring the reliability and stability of the isolation switch.

[0071] The present application does not specifically limit the structure of the balancing assembly 26. Two specific embodiments are provided below for reference: Structure 1 (not shown): Balancing assembly 26 includes a plurality of blades 2602 extending radially along isolation shaft 4. When isolation shaft 4 rotates, blades 2602 effectively come into contact with the air, generating sufficient air resistance to balance the weight of blade contact assembly 12. The number, shape, and size of blades 2602 can be adjusted by those skilled in the art to achieve optimal balancing.

[0072] Structure 2: Figure 18 and Figure 19 As shown, the isolation shaft 4 includes a shaft body 401 and a mounting seat 402, wherein the mounting seat 402 is an insulating structure and is arranged on the outside of the shaft body 401, a mounting cavity 37 is provided in the mounting seat 402, and a slot 30 connected to the mounting cavity 37 is also provided on the mounting seat 402, and the touch knife assembly 12 is installed in the mounting cavity 37 and extends outward from the slot 30, that is, both ends of the touch knife assembly 12 are exposed; and the balancing assembly 26 is also an insulating structure, and the balancing assembly 26 can be detachably installed on the mounting seat 402 and cover the mounting cavity 37.

[0073] It can be understood that such a mounting seat 402 and the structural design of the balance assembly 26 can wrap the installed contact blade assembly 12, and the cooperation of the insulation structure design can make the insulation effect of the contact blade assembly 12 better. It should be known that the isolating switch is generally applied to a three-phase switch, as shown in Figure 18 Therefore, the corresponding mounting seat 402 has three sets of and is spaced equidistantly arranged on the shaft body 401, and the contact blade assemblies 12 between each phase need to be strictly insulated from each other. At the same time, such a structural design is also convenient for the installation and disassembly of the contact blade assembly 12 and the balance assembly 26, that is, after the balance assembly 26 is disassembled, the mounting cavity 37 is opened, and then the contact blade assembly 12 is disassembled, thereby improving the maintainability and convenience of the entire isolating switch.

[0074] It should be noted that the structure one is simple in structure, and the structure two has better insulation effect and is convenient for disassembly and maintenance of the contact blade assembly 12 and the balance assembly 26, and a person skilled in the art can select according to actual needs. Of course, based on the present application, the structure two is preferred, and therefore the structure two of the balance assembly 26 is further described in the following embodiments.

[0075] The specific structure of the balance assembly 26 is further optimized in the present application. The balance assembly 26 includes a cover body 2601 and a fan blade 2602. Of course, the cover body 2601 is installed at the opening position of the mounting cavity 37 to open and close the mounting cavity 37. The fan blade 2602 is arranged outside the cover body 2601 and extends along the radial direction of the isolating shaft 4. This is to enable the fan blade 2602 to better contact the airflow during rotation to generate better air resistance, thereby more effectively balancing the gravity of the contact blade assembly 12.

[0076] Of course, the shape and size of the fan blade 2602 can be designed according to actual needs to ensure that sufficient air resistance can be generated when the isolating shaft 4 rotates. For example: ① as shown in Figure 21 The fan blade 2602 is in the form of a straight plate, which is simple in structure and convenient for processing and installation. ② The side of the fan blade 2602 is recessed in the form of a shell; in other words, the fan blade 2602 can be in the form of a bowl. First, the recessed surface of the bowl structure forces the airflow to separate, forming a low-pressure vortex area at the back and a high-pressure area at the front, thereby forming a significant pressure difference and generating stronger reverse resistance (pressure difference resistance). Second, the airflow needs to bypass the curved surface of the bowl, and the increased flow path causes more kinetic energy to be converted into heat energy, thereby increasing energy loss (resistance).

[0077] Further, in order to better arrange and install the fan blade 2602, as shown in Figure 21 and Figure 23As shown, the cover 2601 is in the form of a fan-shaped shell, and the cover 2601 is snap-fitted to the mounting seat 402, and the center of the cover 2601 coincides with the center of the isolation shaft 4.

[0078] It can be understood that, first, the snap-fitting of the cover 2601 facilitates its later quick disassembly; and after the cover 2601 is installed, its outer circumference is preferably tangent to the outer circumference of the entire isolation shaft 4, as shown in the figure. Figure 23 As shown, in the axial projection direction of the isolation shaft 4, the projection of the cover 2601 coincides with the projection of the isolation shaft 4, and this design ensures the aesthetic appearance; and the cover 2601 and the fan blades 2602 are preferably integrally injection molded with plastic, which not only ensures a certain strength, but also reduces the production cost.

[0079] Specifically, through the concentric design, when rotating, the centers of rotation of the cover 2601 and the isolation shaft 4 are consistent, which can ensure the stability of the relative position between the two, reduce the shaking or misalignment, and further improve the stability and reliability of the overall structure of the isolation shaft 4. At the same time, the circular-arc-shaped shell structure and the design of the fan blades 2602 can also lengthen the creepage safety distance. It should be noted that the creepage distance refers to the shortest distance between two conductive parts measured along the surface of the insulating material. Lengthening the creepage distance has the following advantages: ① Reducing the risk of electric leakage: A longer creepage distance can effectively reduce the risk of electric leakage due to dirt, moisture or other environmental factors. ② Reducing the risk of electrical breakdown: In a high-voltage environment, increasing the creepage distance can reduce the risk of electrical breakdown. Electrical breakdown refers to the loss of insulation performance of the insulating material, causing current to flow through an unintended path. As the creepage distance increases, the likelihood of reaching the breakdown voltage decreases, thereby reducing the likelihood of electrical breakdown. ③ Enhancing insulation strength and improving device reliability.

[0080] In specific implementation, in order to improve the air resistance effect of the balancing assembly 26, the number of fan blades 2602 can be set according to actual needs. In this application, a plurality of fan blades 2602 can be uniformly arranged circumferentially on the outside of the cover 2601 to increase the contact area with the airflow, thereby improving the air resistance and more effectively balancing the gravity of the contact blade assembly 12. If only one fan blade 2602 is used, the fan blade 2602 needs to have a large enough area and be installed at the center position of the cover 2601 to ensure that when the isolation shaft 4 rotates, the fan blade 2602 can generate sufficient air resistance to balance the gravity of the contact blade assembly 12. However, a fan blade 2602 that is too large will not only increase the manufacturing cost, but also may interfere with the surrounding equipment during rotation. Therefore, the preferred solution is to uniformly arrange a plurality of fan blades 2602 circumferentially on the outside of the cover 2601, which not only ensures the air resistance effect, but also avoids interference and high manufacturing cost.

[0081] Specifically, as shown in Figure 7 and Figure 10 The cover 2601 extends outward at both ends to form a clamping portion on the same straight line, and the side of the clamping portion is provided with a clamping block 34 and a clamping plate 35, the clamping block 34 is preferably four groups and is located at the four corner positions of the cover 2601; and the clamping plate 35 is preferably a pair, which is located in the length extension direction of the clamping portion, and a clamping groove 38 is provided on the mounting seat 402.

[0082] It can be understood that when the clamping installation of the cover 2601 is carried out, the clamping block 34 is correspondingly inserted and matched with the clamping groove 38, and at the same time the clamping plate 35 also abuts against the inner side of the mounting cavity 37; here the clamping block 34 and the clamping groove 38 are clamped and matched to realize the installation of the cover 2601, and the clamping plate 35 is used to further support and limit the installed cover 2601, improve the contact area between the cover 2601 and the mounting seat 402, and further improve the stability of the installation of the cover 2601, and prevent the cover 2601 from being deformed.

[0083] Further, as shown in Figure 24 The end of the clamping block 34 has a hook portion, and the width of the clamping groove 38 is greater than the thickness of the clamping block 34. It can be understood that during installation, the hook portion is deformed inward under the extrusion of the clamping groove 38; when the hook portion is completely inserted into the clamping groove 38, the hook portion recovers deformation outward under the action of the elastic force, thereby realizing the stable clamping installation of the cover 2601 on the mounting seat 402. When disassembling the cover 2601, the hook portion is deformed inward under the action of external force, so that the hook portion corresponds to the clamping groove 38, and then the clamping block 34 and the clamping groove 38 can be separated to complete the disassembly.

[0084] It should be known that the two ends of the double-break contact blade assembly 12 have a certain included angle design, and the general included angle θ is between 90° and 150°, and the application adopts a design of 120°. If the contact blade assembly 12 is directly installed as a whole in the mounting cavity 37 and the two ends thereof are extended from the slot 30, the contact blade assembly 12 may be deformed due to external force during installation, thereby affecting the use effect of the contact blade assembly 12.

[0085] In order to solve the above technical problems, as shown in Figure 20As shown, in the present embodiment, the contact blade assembly 12 comprises a lap joint plate 1202 and a pair of contact blades 1201. Specifically during installation, ① first, the lap joint plate 1202 can be installed in the installation cavity 37 through the fixed bending plate 29 and the bolt fixation. ② The contact blade 1201 is inserted into the slot 30, and then the first end of the contact blade 1201 (i.e. the end close to the lap joint plate 1202) is connected with the end position of the lap joint plate 1202 (bolted), and the second end of the contact blade 1201 (i.e. the end away from the lap joint plate 1202) is exposed outside the isolation shaft 4 to form the two end positions of the contact blade assembly 12, and of course the exposed part of the contact blade 1201 can also be provided with a shielding sleeve 33. ③ Finally, the cover 2601 is installed to close and cover the installation cavity 37.

[0086] In the present embodiment, as shown, Figure 17 In order to further improve the insulation performance of the isolation shaft 4, the isolation shaft 4 (i.e. the shaft body 401 and the mounting seat 402) can also be integrally injection molded with plastic, and the outer part of the shaft body 401 is in a hollow structure. It should be known that the isolation shaft 4 in the prior art is generally made of metal material, although the metal material has high strength and rigidity, but it also has electrical conductivity, which affects the insulation performance of the isolation switch to some extent. The plastic material isolation shaft 4 of the present application is relatively thick, and the hollow structure design not only reduces the overall weight of the isolation shaft 4 and reduces the production cost, but also increases the heat dissipation area inside the isolation shaft 4 and improves the heat dissipation effect. In addition, the design of the hollow structure can also increase the mechanical strength of the isolation shaft 4 and improve its anti-deformation ability, further ensuring the stability and reliability of the isolation shaft 4.

[0087] Further, as shown, Figure 18 On both sides of the mounting seat 402 corresponding to the outer circumferential surface of the shaft body 401, a plurality of annular grooves 27 are formed by being recessed inward, and a reinforcing ring 28 is formed between adjacent annular grooves 27, and the cooperation of the reinforcing ring 28 and the annular groove 27 has the following advantages: the setting of the reinforcing ring 28 can further ensure the mechanical strength and stability of the isolation shaft 4. Specifically, the reinforcing ring 28 can increase the surface area of the outer circumferential surface of the isolation shaft 4, thereby improving its ability to withstand external pressure. At the same time, the reinforcing ring 28 can also play a role in dispersing stress, when the isolation shaft 4 is subjected to external pressure, the stress will be dispersed to each reinforcing ring 28, thereby avoiding damage or deformation caused by stress concentration and other problems.

[0088] Based on the above embodiment, that is, the isolation shaft 4 is made of plastic injection molding, and the lap plate 1202 generally needs to be connected by bolts, but the structural strength of plastic is not enough; Therefore, the installation part 32 needs to be provided in the installation cavity 37, such as the bolt insert 36 is embedded in the installation part 32, and the cooperation of the bolt insert 36 and the bolt can realize the stable installation of the lap plate 1202. Because the installation seat 402 is provided with the notch 30 and the installation cavity 37, the whole installation seat 402 is in a shell type structure, so as to stably install the bolt insert 36, the installation seat 402 needs to have enough thickness, but this will increase the overall quality of the installation seat 402. Further, without increasing the installation seat 402, the installation part 32 can be protrudingly arranged at the outer side of the installation seat 402, but the stability of the installation part 32 is still not good enough, and the strength of the installation part 32 is the premise of determining the stable installation of the whole contact knife assembly 12; In addition, the strength of the notch 30 outside the installation seat 402 is also the premise of determining the stable limiting support of the contact knife assembly 12, as shown in Figure 18 and Figure 19 When the contact knife assembly 12 is closed at both ends, the force of the contact knife assembly 12 on the notch 30 is very large, and the connection position of the notch 30 and the installation seat 402 is very easy to produce stress concentration and cause damage.

[0089] Therefore, in order to further ensure the strength of the installation part 32 and the notch 30, as shown in Figure 19 The reinforcing ribs 31 connected to the outside of the installation seat 402 can be arranged outside the installation part 32 and the notch 30. The arrangement of the reinforcing ribs 31 can significantly improve the structural strength of the installation part 32 and the notch 30. Specifically, the reinforcing ribs 31 can increase the material thickness of the installation seat 402 in the key area, thereby improving its ability to withstand external force. At the same time, the reinforcing ribs 31 can also play a role in dispersing stress, avoiding structural damage caused by stress concentration. When designing the reinforcing ribs 31, those skilled in the art can reasonably set the number, position and shape of the reinforcing ribs 31 according to the actual situation to achieve the best reinforcing effect.

[0090] In the embodiment, as shown in Figure 23 The included angle between the two contact knives 1201 can be 120°, and the center line of the balance assembly 26 (i.e. the cover 2601) is located on the extension line of the angle bisector between the two contact knives 1201. Specifically, the center lines of the two contact knives 1201 and the balance assembly 26 are distributed equidistantly in a circle. Combined with the analysis of the overshoot of the contact knife assembly 12, as shown in Figure 23As shown, during rotation, the gravity of the contactor assembly 12 will drive the isolation shaft 4 to accelerate and overshoot, and at this time, the fan 2602 is arranged at the symmetrical position of the center of gravity of the contactor assembly 12, and the fan 2602 will generate resistance, which will offset the gravity moment generated by the contactor assembly 12 to some extent, thereby effectively slowing down the overshoot.

[0091] The working principle of the application is: As Figures 12 to 14 shown, the static contact 201, the isolation contact 6 and the grounding contact 13 are uniformly distributed at the axis of the isolation shaft 4, that is, the angle between adjacent ones is 120°, and of course the 120° design at both ends of the contactor assembly 12 is also based on the equidistant distribution design of the above-mentioned three positions.

[0092] ①As Figure 12 shown, at this time, the isolation and opening state, the first end (left end) of the contactor assembly 12 is located at the center between the static contact 201 and the isolation contact 6, and the second end (right end) of the contactor assembly 12 is located at the center between the grounding contact 13 and the isolation contact 6; of course, at this time, the vacuum arc-extinguishing chamber 2 is also in the opening and breaking state, thereby realizing the double-break design of the combined switch. ②As Figure 13 shown, the isolation closing operation is carried out: under the action of the operating mechanism, the isolation shaft 4 rotates clockwise, and the contactor assembly 12 will rotate and be matched with the static contact 201 and the isolation contact 6 at both ends. ③As Figure 14 shown, the grounding closing operation is carried out: under the action of the operating mechanism, the isolation shaft 4 rotates counterclockwise, and the contactor assembly 12 will rotate and be matched with the grounding contact 13 and the isolation contact 6 at both ends, and at this time, the grounding loop is connected, and the main loop is disconnected.

[0093] It should be noted that the rotation of the isolation shaft 4 and the main shaft 8 is driven by an external operating mechanism, and the operating mechanism is a common knowledge known to those skilled in the art, and therefore will not be described again. The present application can realize the opening and closing of the isolation break and the opening and closing of the grounding break by rotating the isolation shaft 4 clockwise or counterclockwise, and the double-break effectively solves the problem of electric field creepage distance between the isolation and opening time of the incoming line end and the outgoing line end, so that the switch is safer.

[0094] Finally, it needs to be explained that the present application is mainly applied to 24KV low-carbon environmentally friendly body switch, and has the development direction of small and compact switch cabinet, and is developed 24KV low-carbon environmentally friendly circuit breaker + double-break three-position isolation integrated switch, and the combined switch also adopts the insulation type design in many places, which can effectively improve the insulation performance and safety of the whole equipment. For example, in each key part of the combined switch: vacuum arc extinguishing chamber 2, contact blade assembly 12, isolation shaft 4, isolation contact 6 and installed bolt, etc., insulation materials or insulation structures are used for wrapping or isolation, so as to avoid equipment failure or safety accident caused by phase-to-phase short circuit or contact discharge; such insulation design can also effectively improve the withstand voltage level and anti-breakdown capability of the equipment, so that it can stably operate under more severe working conditions. At the same time, the design of the rack 1 makes the electrical equipment structure more compact and smaller, reduces the occupied working space, and is easy to operate.

[0095] It should be known that in the prior art, the switch device is installed in a sealed box body, and then the box body needs to be filled with sulfur hexafluoride (SF6) gas, which has good insulation and arc extinguishing performance, and can ensure safe production operation. However, SF6 gas is chemically stable and not easy to decompose in the atmospheric environment; moreover, SF6 gas can harm the environment and cause the greenhouse effect; in addition, the existing SF6 gas usually contains toxic low-sulfur fluoride, hydrogen fluoride and sulfur dioxide gas, which can easily cause harm to the human body.

[0096] And the present application adopts the above-mentioned insulation and voltage resistance design in many places, without filling sulfur hexafluoride (SF6) gas, and can use dry air or environmentally friendly nitrogen for insulation work; on the one hand, it can ensure safe production operation, on the other hand, it will not harm the environment and the human body, and has good environmental protection performance. In addition, the switch metal material parts of the present application use copper for the conductive part, and the rest use stainless steel material for part processing, thereby effectively controlling the electromagnetic effect caused by the material magnetic field on the switch itself.

[0097] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A combination switch device, characterized in that: include: A frame, wherein the frame is formed by splicing a plurality of insulating partitions and forming a plurality of isolation cavities inside; A vacuum interrupter chamber, which is vertically mounted corresponding to the isolation cavity and has a static contact at the bottom end; An isolation contact, wherein the isolation contact is mounted on the bottom end of the frame via an insulating isolation beam, wherein an isolation area corresponding to the isolation cavity is provided on the isolation beam, and the isolation contact is located in the corresponding isolation area; A grounding contact, the grounding contact being mounted at the bottom end of the frame and corresponding to the isolation cavity; as well as The contact knife assembly is rotatably mounted on the bottom end of the frame via an isolation shaft; when the circuit breaker is closed, the first end of the contact knife assembly cooperates with the static contact and is located in the isolation cavity, and the second end of the contact knife assembly cooperates with the isolation contact and is located in the isolation area.

2. The combined switch device according to claim 1, wherein: The frame includes an isolation front plate, an isolation rear plate, a pair of side plates and multiple three-phase partition plates. The two end positions of the two side plates are respectively docked with the isolation front plate and the isolation rear plate. The three-phase partition plates are installed at intervals between the two side plates, thereby forming the isolation cavity between adjacent three-phase partition plates.

3. The combined switch device according to claim 1, wherein: A plurality of partition plate groups are installed at intervals outside the isolation beam. The partition plate group includes a plurality of partition plate bodies. Adjacent partition plate bodies are arranged at equal intervals. The partition plate group is located on both sides of the isolation contact to form the isolation area.

4. The combined switch device according to claim 3, wherein: A plurality of insulating tubes are provided at the bottom end of the isolation beam, and the insulating tubes are covered at the bottom end positions corresponding to the isolation contacts. The outside of the insulating tubes is provided with avoidance openings for the isolation contacts to connect the lines, and the positions of the avoidance openings correspond to the sides of the isolation beam.

5. The combined switch device according to claim 1, wherein: The static contact includes a contact plate and a head body, the head body is arranged at the bottom end of the contact plate, the bottom end of the contact plate is installed with an insulating plate covering it through a connecting piece, and the bottom end of the insulating plate is provided with an insulating cylinder 2 covering the connecting piece.

6. The combined switch device according to claim 2, wherein: The three-phase partition plate extends outward from the side position close to the side plate to form a plug-in portion, and a slot is provided on the outer side of the side plate; when the three-phase partition plate is installed, the plug-in portion cooperates with the slot, and the side plate and the three-phase partition plate are abutted against each other.

7. The combined switch device according to claim 1, wherein: The isolation shaft includes a shaft body and a mounting seat, and the touch knife assembly is mounted on the shaft body; the mounting seat is an insulating structure, the mounting seat is arranged outside the shaft body and covers the touch knife assembly, and the end of the touch knife assembly extends out of the mounting seat.

8. The combined switch device according to claim 7, wherein: The isolation shaft is formed by integral plastic injection molding, and the shaft body is a hollow structure; the outer circumference of the shaft body is inwardly recessed to form a plurality of annular grooves, and reinforcement rings are formed between adjacent annular grooves.

9. The combined switch device according to claim 7 or 8, characterized in that: The touch blade assembly has a double-break structure and the angle between the two ends is θ, where 90°<θ<150°. The touch blade assembly includes a lap plate and a pair of touch blades. A mounting cavity is provided in the mounting seat, and a slot communicating with the mounting cavity is also provided on the mounting seat. The lap plate is installed in the mounting cavity, and the touch blade is suitable for being plugged into the slot and connected to the end of the lap plate. A cover with an insulating structure is detachably installed on the outside of the mounting seat, and the cover is suitable for covering the mounting cavity.

10. The combined switch device according to claim 9, characterized in that: The combination switch device also includes a balancing assembly, which is mounted on the isolation shaft and is offset from the contact knife assembly in the circumferential direction; when the isolation shaft rotates, the windward area of ​​the balancing assembly is larger than the windward area of ​​the contact knife assembly, and the balancing assembly is suitable for balancing the gravity of the contact knife assembly through air resistance.

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