A double isolation circuit breaker mechanism

Abstract

The invention provides a double-isolation circuit breaker mechanism, belonging to the technical field of circuit breakers, comprising a circuit breaker assembly, the circuit breaker assembly comprising a sealed pole, the sealed pole comprising an insulating shell, an upper conductive rod, a lower conductive rod, an upper contact and a lower contact, the upper conductive rod is slidably arranged at the upper end of the insulating shell, the lower conductive rod is slidably arranged at the lower end of the insulating shell, the inner wall of the upper end of the insulating shell is provided with an inner ring portion, two positioning sleeves are arranged on the inner ring portion, a linkage channel is arranged between the two positioning sleeves, an upper rack is arranged on the outer wall of the upper conductive rod, a moving sleeve is arranged on the lower conductive rod, a lower rack is arranged on the moving sleeve, and a transmission gear is arranged in the linkage channel; in the invention, the upper conductive rod and the lower conductive rod are both arranged to be movable, and then synchronous movement toward or away from each other is achieved through a rack and gear transmission structure, so that the fracture distance can be maximized in the limited space of the insulating shell, thereby improving the arc extinguishing performance of the sealed pole.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a double-isolation circuit breaker mechanism. Background Art

[0002] Electricity has become an indispensable part of people's lives, but various dangers may occur during the conduction of electricity, which may lead to short circuits and other dangerous accidents. Therefore, people invented circuit breakers to reduce the occurrence of accidents. The function of circuit breakers is to quickly cut off the power supply when a short circuit or overcurrent fault occurs in the circuit to prevent the fault from expanding. At the same time, they can also be used as general switches to achieve the distribution and control of electrical energy.

[0003] The patent with publication number CN218730617U previously applied by the applicant discloses an upper and lower isolating circuit breaker, which includes a frame, in which an upper isolating assembly, a circuit breaker assembly and a lower isolating assembly are arranged in sequence from top to bottom. The circuit breaker assembly includes a sealed pole, a first conductive member electrically connected to the upper end of the sealed pole, a lower isolating static contact electrically connected to the lower end of the sealed pole, an insulating plate located on both sides of the sealed pole and a circuit breaker linkage mechanism, wherein a conventional sealed pole is generally adopted, which includes an insulating shell, a movable end conductive rod, a static end conductive rod, a movable end contact and a static end contact. Due to the limited space in the insulating shell, the fracture distance formed by the movable end contact and the static end contact when disconnected is limited, which leads to a reduction in its arc extinguishing performance, thereby affecting the arc extinguishing ability of the entire mechanism. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a double isolation circuit breaker mechanism.

[0005] The technical solution adopted by the present invention is as follows: The present application provides a double-isolation circuit breaker mechanism, including an upper isolation component, a circuit breaker component and a lower isolation component, the circuit breaker component includes a sealed pole, an upper conductive structure, a lower conductive structure and an insulating partition located on both sides of the sealed pole, the sealed pole includes an insulating shell, an upper conductive rod, a lower conductive rod, an upper contact and a lower contact, at least one side of the insulating shell is connected to the insulating partition, the upper conductive rod is slidably arranged at the upper end of the insulating shell along the axial direction of the insulating shell, the lower conductive rod is slidably arranged at the lower end of the insulating shell along the axial direction of the insulating shell, the inner wall of the upper end of the insulating shell is formed inwardly with an inner ring portion, two positioning sleeves are arranged upward and downward on the inner ring portion, and a positioning sleeve is arranged between the two positioning sleeves. A linkage channel is provided, an upper rack is provided on at least one side outer wall of the upper conductive rod along its axial direction, a movable sleeve is provided on the lower conductive rod towards the inner ring portion and moves synchronously therewith, a lower rack is provided on the movable sleeve corresponding to the upper rack, and a transmission gear meshing with the upper rack and the lower rack is provided in the linkage channel. When the upper conductive rod moves downward, the upper rack drives the transmission gear to rotate, and the transmission gear drives the lower rack to move upward, so that the lower conductive rod moves upward to achieve the closing of the upper contact and the lower contact; when the upper conductive rod moves upward, the upper rack drives the transmission gear to rotate, and the transmission gear drives the lower rack to move downward, so that the lower conductive rod moves downward to achieve the disconnection of the upper contact and the lower contact.

[0006] In some embodiments, a synchronously rotating matching gear is provided on one side of the transmission gear, and one of the upper rack and the lower rack is meshed with the transmission gear, and the other is meshed with the matching gear.

[0007] In some embodiments, upper racks are provided on both side outer walls of the upper conductive rod along its axial direction, and the movable sleeve includes a fixed sleeve portion and two extension plate portions, the fixed sleeve portion is sleeved on the lower conductive rod and fixed thereto, the extension plate portion is formed by the fixed sleeve portion extending upward corresponding to the upper rack, the lower rack is provided on the extension plate portion, and the inner ring portion is provided with positioning holes for the extension plate portion and the lower rack to pass through.

[0008] In some embodiments, the two extended plate portions are arc-shaped and coaxially arranged, and two mounting openings are formed in the circumferential direction, and arc-shaped arc-extinguishing hoods are arranged in the mounting openings. The two arc-extinguishing hoods and the two extended plate portions surround to form a cylindrical cover body, and the upper contact and the lower contact are located in the cover body for closing and disconnecting.

[0009] In some embodiments, the arc-extinguishing cover includes an outer frame and a plurality of arc-extinguishing plates, and the plurality of arc-extinguishing plates are arranged at intervals along the circumferential direction of the cover body and are all arranged to be inclined in a clockwise or counterclockwise direction.

[0010] In some embodiments, a connecting plate portion is provided between the two outer frames in the circumferential direction, a magnetic conductive plate is provided between the connecting plate portion and the extension plate portion, and the two magnetic conductive plates form a magnetic field to blow the arc toward the arc extinguishing cover.

[0011] In some embodiments, the upper conductive rod is connected to the upper contact, the lower conductive rod is connected to the lower contact, a mounting hole is provided on the upper contact facing the lower contact, the mounting hole is coaxially arranged with the upper conductive rod, a guide column is coaxially arranged in the mounting hole, a guide hole is provided on the lower contact facing the upper contact, the guide hole is coaxially arranged with the guide column, a guide cone hole is coaxially arranged at the open end of the guide hole, one end of the guide column facing the guide hole is provided as a dome, a lubricating sleeve is provided at the end of the guide column, and the lubricating sleeve covers the surface of the dome.

[0012] In some embodiments, the insulating shell includes an insulating tube and end covers arranged at both ends of the insulating tube, a connecting column portion is arranged on the insulating tube facing the insulating partition, a connecting groove portion adapted to the connecting column portion is arranged on the insulating partition, the insulating tube is inserted into the connecting groove portion and fixed by bolts, an upper conductive plate and a lower conductive plate are respectively arranged on the insulating partition corresponding to the upper conductive rod and the lower conductive rod, the upper conductive rod is electrically connected to the upper conductive plate through a flexible conductive strip, and the lower conductive rod is electrically connected to the lower conductive plate through a flexible conductive strip.

[0013] In some embodiments, the lower isolation assembly includes a lower static contact and a lower isolation knife disposed on the conductive plate, a mounting plate portion extends from the upper conductive plate, and the upper isolation assembly includes an upper isolation knife and an upper static contact seat disposed on the mounting plate portion.

[0014] In some embodiments, a shielding cover is pre-embedded in the inner wall of the insulating shell, and the movable sleeve also includes a push plate portion, and a sliding sealing structure is arranged between the circumferential outer wall of the push plate portion and the circumferential inner wall of the shielding cover, and the sliding sealing structure divides the insulating shell into an upper chamber and a lower chamber that are independently sealed, and the upper contact and the lower contact perform separation and combination actions in the upper chamber, and the upper chamber and the lower chamber are both filled with insulating gas, and a plurality of air supply channels are evenly arranged circumferentially on the push plate portion, and a one-way valve is arranged in the air supply channel, and the one-way valve allows the insulating gas to flow from the lower chamber to the upper chamber, and an inflation joint and an inflation tube are arranged on the insulating shell corresponding to the lower chamber.

[0015] The beneficial effects of the present invention are as follows: in the present invention, the upper conductive rod and the lower conductive rod are both arranged to be movable, and then synchronous movement toward or away from each other is achieved through a rack and gear transmission structure, which not only makes the movement of the upper conductive rod more stable and reliable, but also can maximize the fracture distance within the limited space of the insulating shell, thereby greatly improving the arc extinguishing performance of the sealed pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0017] Figure 1 It is a schematic diagram of a double isolation circuit breaker mechanism in the first embodiment;

[0018] Figure 2 A schematic diagram of a circuit breaker assembly in Embodiment 1;

[0019] Figure 3 A partial cross-sectional view of the circuit breaker assembly in Example 1 Figure 1 ;

[0020] Figure 4 It is a partial exploded view of the circuit breaker assembly in the first embodiment;

[0021] Figure 5 is a schematic diagram of the insulating housing in the first embodiment;

[0022] Figure 6 A partial cross-sectional view of the circuit breaker assembly in Example 1 Figure 2 ;

[0023] Figure 7 It is a partial cross-sectional view of the circuit breaker assembly in the second embodiment. DETAILED DESCRIPTION

[0024] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0025] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0027] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; 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 an internal connection between two devices, elements or components.

[0028] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0030] Embodiment 1:

[0031] like Figures 1 to 6As shown, this embodiment provides a double-isolation circuit breaker mechanism, including an upper isolation component 1, a circuit breaker component 2 and a lower isolation component 3, the circuit breaker component 2 includes a sealed pole 20, an upper conductive structure 21, a lower conductive structure 22 and an insulating partition 23 located on both sides of the sealed pole 20, the sealed pole 20 includes an insulating shell 200, an upper conductive rod 201, a lower conductive rod 202, an upper contact 203 and a lower contact 204, at least one side of the insulating shell 200 is connected to the insulating partition 23, the upper conductive rod 201 is connected to the insulating shell 200 along the axial direction The lower conductive rod 202 is slidably arranged at the upper end of the insulating housing 200, and is slidably arranged at the lower end of the insulating housing 200 along the axial direction of the insulating housing 200. The inner wall of the upper end of the insulating housing 200 is formed with an inner ring portion 205 inwardly, and two positioning sleeves 206 are arranged downwardly on the inner ring portion 205, and a linkage channel 207 is arranged between the two positioning sleeves 206. At least one side of the outer wall of the upper conductive rod 201 is provided with an upper rack 208 along its axial direction, and a movable sleeve that moves synchronously with the inner ring portion 205 is arranged on the lower conductive rod 202 toward the inner ring portion 205. 209, a lower rack 210 is provided on the movable sleeve 209 corresponding to the upper rack 208, and a transmission gear 211 meshing with the upper rack 208 and the lower rack 210 is provided in the linkage channel 207. When the upper conductive rod 201 moves downward, the upper rack 208 drives the transmission gear 211 to rotate, and the transmission gear 211 drives the lower rack 210 to move upward, so that the lower conductive rod 202 moves upward, realizing the closing of the upper contact 203 and the lower contact 204. When the upper conductive rod 201 moves upward, the upper rack 208 The transmission gear 211 is driven to rotate, and the transmission gear 211 drives the lower rack 210 to move downward, so that the lower conductive rod 202 moves downward, and the upper contact 203 and the lower contact 204 are disconnected. By setting the upper conductive rod 201 and the lower conductive rod 202 to be movable, and then realizing synchronous movement toward or away from each other through the rack and gear transmission structure, not only the movement of the upper conductive rod 201 is made more stable and reliable, but also the fracture distance can be maximized within the limited space of the insulating shell, thereby greatly improving the arc extinguishing performance of the sealed pole. It should be understood that the rack and gear transmission structure and the movable sleeve 209 can be interchanged up and down.

[0032] A circuit breaker linkage assembly is arranged above the sealed pole 20, and the circuit breaker linkage assembly can pull the upper conductive rod 201 to move up and down to realize the closing and disconnection of the upper contact 203 and the lower contact 204. Since the upper conductive rod 201 and the lower conductive rod 202 are both arranged to be movable, even if the sealed pole 20 is inverted, or the circuit breaker linkage assembly is arranged below the sealed pole 20, normal disconnection can also be achieved. Therefore, the sealed pole 20 has better adaptability to various circuit breakers.

[0033] Optionally, a synchronously rotating matching gear is provided on one side of the transmission gear 211, and the upper rack 208 and the lower rack 210, one of which is meshed with the transmission gear 211, and the other is meshed with the matching gear. In this way, by adjusting the transmission ratio of the transmission gear 211 and the matching gear, the moving speed of the upper conductive rod 201 and the lower conductive rod 202 can be controlled, thereby achieving the control of the closing speed and the disconnection speed of the upper contact 203 and the lower contact 204. When rapid arc extinguishing is required, it is only necessary to select gears and racks with suitable transmission ratios to speed up the disconnection speed of the upper contact 203 and the lower contact 204.

[0034] In the embodiment of the present disclosure, upper racks 208 are provided on both side outer walls of the upper conductive rod 201 along the axial direction thereof, and the movable sleeve 209 includes a fixed sleeve portion 213 and two extension plate portions 214, the fixed sleeve portion 213 is sleeved on the lower conductive rod 202 and fixed thereto, the extension plate portion 214 is formed by the fixed sleeve portion 213 extending upward corresponding to the upper rack 208, the lower rack 210 is provided on the extension plate portion 214, and the inner ring portion 205 is provided with a positioning hole 215 for the extension plate portion 214 and the lower rack 210 to pass through, so that the movement of the upper conductive rod 201 is more stable, and the force transmitted to the lower conductive rod 202 is more uniform, thereby avoiding the problem of tilting of the lower conductive rod 202.

[0035] In the embodiment of the present disclosure, the two extended plate portions 214 are both arc-shaped and coaxially arranged, and two mounting openings are formed in the circumferential direction, and an arc-shaped arc-extinguishing hood 4 is arranged in the mounting opening. The two arc-extinguishing hoods 4 and the two extended plate portions 214 surround a cylindrical cover body 40. The upper contact 203 and the lower contact 204 are located in the cover body 40 for closing and disconnecting. The cover body 40 surrounds the upper contact 203 and the lower contact 204 in a cylindrical shape, which increases the chance of extinguishing the arc and improves the arc extinguishing performance of the equipment.

[0036] Secondly, the arc extinguishing cover 4 includes an outer frame 41 and a plurality of arc extinguishing pieces 42. The plurality of arc extinguishing pieces 42 can be uniformly installed on the outer frame 41 first, and then installed on the movable sleeve 209, which simplifies the assembly process and is also convenient for later repair and maintenance. The plurality of arc extinguishing pieces 42 are arranged at intervals along the circumferential direction of the cover body 40, and are all arranged in a clockwise or counterclockwise tilt. The design of the plurality of arc extinguishing pieces 42 enables the airflow in the cover body 40 to cut off the arc more effectively, thereby improving the success rate of extinguishing the arc and reducing the arc duration. In addition, the clockwise or counterclockwise tilting setting of the arc extinguishing piece 42 can effectively guide the flow direction of the arc, enhance the control ability of the airflow, and thus improve the arc extinguishing efficiency.

[0037] Optionally, a connecting plate portion 43 is provided in the interval in the circumferential direction between the two outer frames 41, and a magnetic conductive plate is provided between the connecting plate portion 43 and the extension plate portion 214. The two magnetic conductive plates form a magnetic field to blow the arc toward the arc extinguishing cover 4, thereby increasing the probability of the arc being extinguished and improving the arc extinguishing efficiency of the sealed pole.

[0038] Compared with the conventional sealed pole, the upper contact 203 and the lower contact 204 in the sealed pole need to be moved, so the alignment accuracy requirement of the upper contact 203 and the lower contact 204 is improved. Based on this, in the embodiment of the present disclosure, the upper conductive rod 201 is connected to the upper contact 203, and the lower conductive rod 202 is connected to the lower contact 204. The upper contact 203 is provided with a mounting hole 50 facing the lower contact 204, and the mounting hole 50 is coaxially arranged with the upper conductive rod 201. A guide column 51 is coaxially arranged in the mounting hole 50, and the lower contact 204 is provided with a guide hole 52 facing the upper contact 203. The guide hole 52 is coaxially arranged with the guide column 51. The coaxially arranged guide column 51 and guide hole 52 ensure the alignment accuracy of the upper and lower contacts during connection, thereby reducing poor contact caused by inaccurate alignment.

[0039] Furthermore, a guide tapered hole 53 is coaxially arranged at the open end of the guide hole 52 to help guide the entry of the guide column 51 and reduce friction and resistance during the insertion process.

[0040] Furthermore, one end of the guide column 51 facing the guide hole 52 is set as a dome portion 54, and a lubricating sleeve is set at the end of the guide column 51, and the lubricating sleeve covers the surface of the dome portion 54. The design of the dome portion 54 and the application of the lubricating sleeve reduce wear and reduce the failure rate of components during use, thereby extending the service life of the overall equipment.

[0041] In the disclosed embodiment, the insulating shell 200 includes an insulating cylinder 2001 and end covers 2002 arranged at both ends of the insulating cylinder 2001, a connecting column portion 2003 is arranged on the insulating cylinder 2001 facing the insulating partition 23, and a connecting groove portion 230 adapted to the connecting column portion 2003 is arranged on the insulating partition 23, the insulating cylinder 2001 is inserted into the connecting groove portion 230 and fixed by bolts, thereby achieving a stable connection and enhancing the integrity of the structure, and an upper conductive plate 6 and a lower conductive plate 7 are respectively arranged on the insulating partition 23 corresponding to the upper conductive rod 201 and the lower conductive rod 202, the upper conductive rod 201 is electrically connected to the upper conductive plate 6 through a flexible conductive strip 8, and the lower conductive rod 202 is electrically connected to the lower conductive plate 7 through the flexible conductive strip 8. The use of the flexible conductive strip 8 to connect the conductive rod and the conductive plate can adapt to the displacement and vibration of the upper and lower conductive rods during operation, effectively reduce the risk of poor contact, and ensure the stability of the electrical connection.

[0042] It can be understood that the lower isolation assembly 3 includes a lower static contact and a lower isolation knife arranged on the conductive plate, a mounting plate portion extends from the upper conductive plate 6, and the upper isolation assembly 1 includes an upper isolation knife and an upper static contact seat arranged on the mounting plate portion. Regarding the upper isolation knife, the lower isolation knife and other structures, reference can be made to the patent with publication number CN218730617U previously applied by the applicant, which discloses an upper and lower isolation circuit breaker, or the patent with publication number CN115663672B, which discloses an upper and lower double isolation air insulated switch cabinet.

[0043] Embodiment 2:

[0044] like Figure 7 As shown, this embodiment is an improvement on the first embodiment, and further improves the insulation performance and service life of the sealed pole. Specifically, a shielding cover 2000 is pre-buried in the inner wall of the insulating shell 200, and the shielding cover 2000 and the insulating shell 200 are integrally injection-molded. A sliding sealing structure 200a is provided between the shielding cover 2000 and the movable sleeve 209, and the sliding sealing structure 200a separates the insulating shell 200 into an upper chamber 200b and a lower chamber 200c that are independently sealed. The upper contact 203 and the lower contact 204 perform separation and combination actions in the upper chamber 200b, and the upper chamber 200b and the lower chamber 200c are filled with insulating gas, such as SF6 gas, nitrogen, etc. The movable sleeve 209 also includes a push plate portion 2090, and the sliding sealing structure 200a is provided between the circumferential outer wall of the push plate portion 2090 and the circumferential inner wall of the shielding cover 2000, which includes at least two sealing members, the push plate portion 2090 and the sliding sealing structure 200a. A plurality of air supply channels are evenly arranged on the plate portion 2090 in the circumferential direction, and each of the air supply channels is provided with a one-way valve 200d, and the one-way valve 200d allows the insulating gas to flow from the lower chamber 200c to the upper chamber 200b. The end cover 2002 corresponding to the lower chamber 200c is provided with an air charging joint 200e and an air charging pipe 200f. Whenever the upper conductive rod 201 moves upward, the upper rack 208 drives the transmission gear 211 to rotate, and the transmission gear 211 rotates. 11 then drives the lower rack 210 to move downward, thereby causing the lower conductive rod 202 to move downward, realizing the disconnection of the upper contact 203 and the lower contact 204, and generating an arc. At this time, the insulating gas in the upper chamber 200b is consumed, and the volume of the lower chamber 200c becomes smaller due to the downward movement of the push plate part 2090. The insulating gas in the lower chamber 200c can be replenished into the upper chamber 200b through the one-way valve 200d, thereby maintaining the insulation performance in the upper chamber 200b.

[0045] Secondly, the inflation tube 200f is externally connected to an inflation device, which can be set to replenish a certain amount of insulating gas into the lower chamber 200c after each certain number of openings. In the present embodiment, the inflation tube 200f is connected to the insulating partition 23, and the inflation device is located on the outside of the insulating partition 23; in addition, an air pressure detection device can also be provided on the inflation tube 200f to monitor the air pressure in the lower chamber 200c in real time so as to facilitate timely replenishment.

[0046] In summary, after reading this detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, those skilled in the art will appreciate that the requirements of this application encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0047] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0048] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A double-isolation circuit breaker mechanism, comprising an upper isolation assembly, a circuit breaker assembly and a lower isolation assembly, characterized in that: The circuit breaker assembly includes a sealed pole, an upper conductive structure, a lower conductive structure and an insulating partition located on both sides of the sealed pole, the sealed pole includes an insulating shell, an upper conductive rod, a lower conductive rod, an upper contact and a lower contact, at least one side of the insulating shell is connected to the insulating partition, the upper conductive rod is slidably arranged at the upper end of the insulating shell along the axial direction of the insulating shell, the lower conductive rod is slidably arranged at the lower end of the insulating shell along the axial direction of the insulating shell, the inner wall of the upper end of the insulating shell is formed with an inner ring portion inwardly, two positioning sleeves are arranged upward and downward on the inner ring portion, a linkage channel is arranged between the two positioning sleeves, at least one side of the outer wall of the upper conductive rod is slidably arranged along the axial direction thereof An upper rack is arranged on the lower conductive rod, and a movable sleeve is arranged on the lower conductive rod toward the inner ring part and moves synchronously therewith. A lower rack is arranged on the movable sleeve corresponding to the upper rack, and a transmission gear meshing with the upper rack and the lower rack is arranged in the linkage channel. When the upper conductive rod moves downward, the upper rack drives the transmission gear to rotate, and the transmission gear drives the lower rack to move upward, so that the lower conductive rod moves upward to realize the closing of the upper contact and the lower contact. When the upper conductive rod moves upward, the upper rack drives the transmission gear to rotate, and the transmission gear drives the lower rack to move downward, so that the lower conductive rod moves downward to realize the disconnection of the upper contact and the lower contact.

2. A double isolation circuit breaker mechanism according to claim 1, characterized in that: A synchronously rotating speed matching gear is arranged on one side of the transmission gear, and one of the upper rack and the lower rack is meshed with the transmission gear, and the other is meshed with the speed matching gear.

3. A double isolation circuit breaker mechanism according to claim 1 or 2, characterized in that: The outer walls on both sides of the upper conductive rod are provided with upper racks along the axial direction thereof, and the movable sleeve includes a fixed sleeve portion and two extension plate portions, the fixed sleeve portion is sleeved on the lower conductive rod and fixed thereto, the extension plate portion is formed by the fixed sleeve portion extending upwardly corresponding to the upper rack, the lower rack is provided on the extension plate portion, and the inner ring portion is provided with positioning holes for the extension plate portion and the lower rack to pass through.

4. A double isolation circuit breaker mechanism according to claim 3, characterized in that: The two extended plate portions are both arc-shaped and coaxially arranged, and have two mounting openings formed in the circumferential direction, wherein an arc-shaped arc-extinguishing hood is arranged in the mounting opening, and the two arc-extinguishing hoods and the two extended plate portions surround to form a cylindrical hood body, and the upper contact and the lower contact are located in the hood body for closing and disconnecting.

5. A double isolation circuit breaker mechanism according to claim 4, characterized in that: The arc extinguishing cover comprises an outer frame and a plurality of arc extinguishing plates, wherein the plurality of arc extinguishing plates are arranged at intervals along the circumferential direction of the cover body and are all arranged to be inclined in a clockwise or counterclockwise direction.

6. A double isolation circuit breaker mechanism according to claim 5, characterized in that: A connecting plate portion is provided in the interval in the circumferential direction between the two outer frames, a magnetic conductive plate is provided between the connecting plate portion and the extension plate portion, and the two magnetic conductive plates form a magnetic field to blow the arc toward the arc extinguishing cover.

7. A double isolation circuit breaker mechanism according to claim 1, characterized in that: The upper conductive rod is connected to the upper contact, and the lower conductive rod is connected to the lower contact. A mounting hole is arranged on the upper contact toward the lower contact, and the mounting hole is coaxially arranged with the upper conductive rod. A guide column is coaxially arranged in the mounting hole. A guide hole is arranged on the lower contact toward the upper contact, and the guide hole is coaxially arranged with the guide column. A guide cone hole is coaxially arranged at the open end of the guide hole. One end of the guide column facing the guide hole is arranged as a dome. A lubricating sleeve is arranged at the end of the guide column, and the lubricating sleeve covers the surface of the dome.

8. A double isolation circuit breaker mechanism according to claim 3, characterized in that: The insulating shell includes an insulating cylinder and end covers arranged at both ends of the insulating cylinder, a connecting column portion is arranged on the insulating cylinder facing the insulating partition, a connecting groove portion adapted to the connecting column portion is arranged on the insulating partition, the insulating cylinder is inserted into the connecting groove portion and fixed by bolts, an upper conductive plate and a lower conductive plate are respectively arranged on the insulating partition corresponding to the upper conductive rod and the lower conductive rod, the upper conductive rod is electrically connected to the upper conductive plate through a flexible conductive strip, and the lower conductive rod is electrically connected to the lower conductive plate through a flexible conductive strip.

9. A double isolation circuit breaker mechanism according to claim 8, characterized in that: The lower isolation assembly includes a lower static contact and a lower isolation knife arranged on the conductive plate, a mounting plate portion extends from the upper conductive plate, and the upper isolation assembly includes an upper isolation knife and an upper static contact seat arranged on the mounting plate portion.

10. A double isolation circuit breaker mechanism according to claim 1, characterized in that: A shielding cover is pre-embedded in the inner wall of the insulating shell, and the movable sleeve also includes a push plate part. A sliding sealing structure is arranged between the circumferential outer wall of the push plate part and the circumferential inner wall of the shielding cover. The sliding sealing structure divides the insulating shell into an upper chamber and a lower chamber that are independently sealed. The upper contact and the lower contact perform separation and combination actions in the upper chamber. The upper chamber and the lower chamber are both filled with insulating gas. A plurality of air supply channels are evenly arranged circumferentially on the push plate part, and a one-way valve is arranged in the air supply channel. The one-way valve allows the insulating gas to flow from the lower chamber to the upper chamber. An inflation joint and an inflation tube are arranged on the insulating shell corresponding to the lower chamber.

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