High-voltage double-air-chamber column type vacuum circuit breaker structure

Abstract

The invention discloses a high-voltage double-air-chamber column type vacuum circuit breaker structure, and belongs to the technical field of high-voltage electrical appliances, the high-voltage double-air-chamber column type vacuum circuit breaker structure comprises an upper sleeve and a lower sleeve which are fixedly connected, the upper sleeve is internally provided with a vacuum arc-extinguishing chamber, the lower sleeve is internally provided with an insulating pull rod sleeve, and the insulating pull rod sleeve is fixedly connected with the upper sleeve. An insulating pull rod is arranged in the insulating pull rod sleeve, the insulating pull rod is connected with a movable end conducting rod of the vacuum arc-extinguishing chamber through a contact spring, and a movable end supporting conductor and a static end supporting conductor are installed at the two ends of the vacuum arc-extinguishing chamber respectively to form a supporting chain. An annular cavity between the supporting chain and the upper sleeve is communicated with an annular cavity between the insulating pull rod sleeve and the lower sleeve to form a high gas chamber; an annular cavity between the insulating pull rod sleeve and the insulating pull rod, an inner cavity of the movable end supporting conductor and an inner cavity of the corrugated pipe form a low air chamber; the periphery of one end, close to the vacuum arc-extinguishing chamber, of the insulation pull rod sleeve is provided with an outer shield, thereby improving the electric field intensity of the inner surfaces of the insulation pull rod and the insulation pull rod sleeve, and improving the insulation level.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage electrical appliances, and in particular relates to a high-voltage double-chamber column type vacuum circuit breaker structure. Background Art

[0002] Existing high-voltage circuit breakers generally use SF6 gas as electrical insulation and circuit breaking medium, but SF6 gas is a greenhouse gas with a very long atmospheric life. The greenhouse effect has a great impact and causes serious pollution to the environment. Power grids and enterprises have formulated sulfur hexafluoride gas emission reduction action plans to achieve zero sulfur hexafluoride gas emissions. Therefore, the use of sulfur hexafluoride gas products will be strictly restricted. Therefore, replacing SF6 becomes particularly important. At present, one of the most common SF6 replacement methods in high-voltage circuit breakers is to use a vacuum arc chamber as a breaking element, and the external insulation medium uses environmentally friendly gases, such as N2, C02, clean air, etc. However, the dielectric constant of environmentally friendly gases is usually much lower than that of SF6, so if you want to achieve the same external insulation effect, the inflation pressure requirements will be relatively high.

[0003] The bellows in the vacuum interrupter are usually thin-walled components made of stainless steel with a thickness of 0.1mm-0.2mm. The material and structural characteristics of the bellows determine that its allowable withstand pressure is limited. When the pressure of the insulating medium is too high, it may exceed the allowable withstand pressure of the bellows. The bellows are easily damaged if they work in an environment above the allowable withstand pressure for a long time, which in turn affects the service life of the vacuum circuit breaker. Therefore, higher inflation pressures pose great challenges to the design, manufacturing and life of the bellows at the moving end of the vacuum interrupter. At the same time, high inflation pressures increase the operating power of the operating mechanism, and the design difficulty increases accordingly. At present, for vacuum circuit breakers with voltage levels of 126kV and above and high inflation pressure, a double air chamber design is adopted, that is, through the design of a special channel, the bellows of the vacuum interrupter are located in the low air chamber to solve the problem that the bellows of traditional vacuum circuit breakers are easily damaged when exposed to high-voltage environments.

[0004] The column type vacuum circuit breaker generally consists of two parts: the upper pole and the lower pole. The upper pole generally contains the static end bracket, vacuum interrupter, contact spring and other components. The lower pole generally contains the insulating pull rod. The design purpose of the double-chamber column type vacuum circuit breaker is to place the bellows of the vacuum interrupter in the lower chamber, which determines that there are many ways to design the double-chamber vacuum circuit breaker.

[0005] At present, the technical solutions closest to the present invention are as follows: 1. Patent name: Non-SF6 gas insulated outdoor high-voltage vacuum circuit breaker, patent number 200810018057.9, the present invention discloses a non-SF6 gas insulated outdoor high-voltage vacuum circuit breaker, including a vacuum interrupter, an insulating porcelain sleeve, a supporting porcelain sleeve, an insulating pull rod, a conductive seat, a crank arm box, a crossbeam, a column, a conductive part, a spring operating mechanism, and a transmission system. The external insulation of the vacuum interrupter is to fill the space surrounded by the arc-extinguishing porcelain sleeve, the arc-extinguishing chamber and the conductive seat with high-purity nitrogen at an absolute pressure of 0.4-0.5MPa to form the upper insulating air chamber of the circuit breaker, or to fill it with other insulating gases or insulating liquids. The space surrounded by the supporting porcelain sleeve, the conductive seat and the crank arm box is filled with high-purity nitrogen at an absolute pressure of 0.1-0.2MPa, or directly filled with dry air to form the lower insulating air chamber of the circuit breaker. The invention does not use SF6 gas as an insulating medium, is harmless to human health, and does not pollute the environment. It is also applicable to outdoor high-voltage vacuum circuit breakers of other voltage levels (including higher voltage levels).

[0006] 2. Patent name: A dual-chamber high-voltage vacuum circuit breaker, application number 201810141653.X. The present invention provides a dual-chamber high-voltage vacuum circuit breaker, including a vacuum arc chamber, a first sealed air chamber and a second sealed air chamber. The outer wall of the vacuum arc chamber is placed in the first sealed air chamber, and the bellows of the vacuum arc chamber is placed in the second sealed air chamber. The air pressure of the first sealed air chamber is not lower than the air pressure of the second sealed air chamber. The present invention realizes the requirements of the external insulation withstand voltage level of the vacuum arc chamber; it not only fully realizes environmental protection but also ensures external insulation, and at the same time avoids damage to the bellows caused by high-pressure gas. It can not only better meet the two-way requirements, but also ensure safety and reliability during use and maintenance. The structure can be applied to column-type vacuum circuit breakers and tank-type vacuum circuit breakers, with a wide range of uses, meeting the needs of different structural devices. By setting the gas path, the gas path pillar for realizing the dual air chamber of the vacuum circuit breaker is realized and designed to meet the needs of setting different positions of the inflatable structure.

[0007] 3. Patent name: A vacuum circuit breaker with a double air chamber structure, application number 201711147990.1, the present invention relates to a vacuum circuit breaker with a double air chamber structure. The vacuum circuit breaker with a double air chamber structure of the present invention comprises a cylinder, a vacuum arc chamber is arranged in the cylinder, a moving end cover is arranged at one end of the vacuum arc chamber housing, the moving contact of the moving contact assembly of the vacuum arc chamber passes through the moving end cover and extends into the interior of the vacuum arc chamber, a bellows is connected between the moving end cover and the moving contact, and a moving end conductor connected to the moving contact in a sliding conductive manner is also arranged in the cylinder, the moving end conductor is sealedly connected to the moving end cover and the cylinder so that the part of the moving contact assembly located outside the vacuum arc chamber is in a sealed chamber, the air pressure in the sealed chamber is less than the air pressure in the cylinder and greater than the air pressure in the vacuum arc chamber to form a low-pressure air chamber, and a high-pressure air chamber is formed between the low-pressure air chamber and the cylinder. The vacuum circuit breaker can effectively protect the bellows in the vacuum arc chamber while having the characteristics of simple structure and easy manufacture.

[0008] 4. Patent name: A high-voltage vacuum circuit breaker, application number 201720784356.8, This utility model discloses a high-voltage vacuum circuit breaker, including an arc extinguishing chamber, a support, a base frame and an operating mechanism; the arc extinguishing chamber is fixed on the base frame through corresponding supports, and the operating mechanism is arranged on the base frame to provide operating power; the arc extinguishing chamber includes an arc extinguishing chamber porcelain sleeve and a vacuum arc extinguishing chamber arranged in the arc extinguishing chamber porcelain sleeve; the support includes a support porcelain sleeve and an insulating pull rod arranged in the support porcelain sleeve; the arc extinguishing chamber porcelain sleeve and the support porcelain sleeve are connected to form an air chamber, and the air chamber is filled with SF6 gas as an internal insulating medium; the operating end of the vacuum arc extinguishing chamber is connected to the operating mechanism through an insulating pull rod. The advantages of this utility model are simple structure, reasonable arrangement, not only small operating work, but also less greenhouse gas SF6 is filled, which can meet the requirements of power grid construction.

[0009] Patent 1 places the upper pole where the vacuum arc chamber and contact spring are located in the high gas chamber, and places the lower pole where the insulating rod is located in the low gas chamber. It only considers the external insulation problem of the vacuum arc chamber, and does not consider the pressure-bearing problem of the bellows in the vacuum arc chamber, nor the insulation problem of the end of the insulating rod, which is located in the low gas chamber. Patents 2 and 3 respectively involve column-type circuit breakers and tank-type circuit breakers, both of which are double-chamber designs, and both place the insulating rod in the low gas chamber. This placement method does not consider the electric field problem of the end of the insulating rod and the inner wall of the insulating tube that forms the low gas chamber. Patent 4 uses SF6 as the external insulating gas, and a vacuum arc chamber is used for breaking. SF6 has particularly strong insulation performance, and filling it with 0.2MPa can meet the insulation requirements, so there is no need to adopt a double-chamber design. Summary of the invention

[0010] The present invention provides a high-voltage double-chamber column type vacuum circuit breaker structure, which improves the electric field strength of the insulating rod and the inner surface of the insulating rod sleeve in the lower chamber, so that the insulation of the entire column type circuit breaker reaches an ideal level.

[0011] In order to achieve the above object, the present invention adopts the following technical solution: A high-voltage double-chamber column vacuum circuit breaker structure comprises an insulating rod, an upper bushing and a lower bushing, wherein an insulating rod sleeve is arranged in the lower bushing, an insulating rod is arranged in the insulating rod sleeve, an outer shield is arranged between the insulating rod sleeve and the insulating rod, and the outer shield is arranged outside one end of the insulating rod sleeve close to the vacuum arc extinguishing chamber; the first end of the lower bushing is mounted on a frame, and the second end is connected to the upper bushing, a vacuum arc extinguishing chamber is arranged in the upper bushing, the first end of the insulating rod is connected to the frame, and the second end is connected to the moving end conductive rod of the vacuum arc extinguishing chamber, a bellows is arranged on the moving end conductive rod, a moving end supporting conductor is installed at the first end of the vacuum arc extinguishing chamber, and a static end supporting conductor is installed at the second end to form a supporting chain, the annular cavity between the supporting chain and the upper bushing, and the annular cavity between the insulating rod sleeve and the lower bushing are connected to form a high air chamber; the annular cavity between the insulating rod sleeve and the insulating rod, the inner cavity of the moving end supporting conductor and the inner cavity of the bellows form a low air chamber.

[0012] Furthermore, the outer shielding includes a cylinder, both ends of which are open, and one end of the opening is provided with an inwardly rolled flange.

[0013] Furthermore, the insulating pull rod is connected to the movable end conductive rod of the vacuum interrupter through a contact spring.

[0014] Furthermore, the first end of the insulating pull rod sleeve is airtightly connected to the mounting flange on the frame through an epoxy casting, and the second end is connected to the inner tube airtight flange by plugging. The plug-in part is sealed with a sealing ring, and the inner tube airtight flange is fixedly connected to the mounting movable end support conductor.

[0015] Furthermore, the frame is provided with a high air chamber inflation port and a low air chamber inflation port, the high air chamber inflation port is communicated with the high air chamber, and the low air chamber inflation port is communicated with the low air chamber.

[0016] Furthermore, the radius of the flange of the outer shield is 10 mm to 30 mm. Furthermore, the difference between the outer diameter of the outer shield and the inner diameter of the lower sleeve is 10 mm to 50 mm; the length of the lower end of the outer shield from the end surface of the moving end heat dissipation bracket is 0.5 to 2 times the inner diameter of the lower sleeve.

[0017] Furthermore, when the switch is opened, the distance between the end of the insulating pull rod and the lower end surface of the outer shield is greater than the length between the lower end of the outer shield and the end surface of the moving end heat dissipation bracket.

[0018] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention proposes a high-voltage double-chamber column vacuum circuit breaker structure, which uses a special channel design to realize the double-chamber structure of the circuit breaker, so that the vacuum arc chamber bellows is located in the low-pressure chamber, solving the problem that the bellows of the traditional vacuum circuit breaker is easily damaged when exposed to a high-voltage environment. At the same time, since the insulating rod and the inner surface of the insulating rod sleeve that forms the air chamber channel are also located in the low-pressure chamber, the low environmental gas inflation pressure means that the electric field tolerance value is very low and the required insulation level cannot be achieved. The present invention also designs an external shielding structure, which solves the problem of electric field concentration on the surface of the insulating rod and the inner surface of the insulating rod sleeve in the low-pressure chamber by setting an external shield between the high-pressure chamber and the low-pressure chamber, balances the electric field, and improves the overall insulation performance of the product.

[0019] Furthermore, through the matching design of the outer shield, lower bushing, insulating rod and insulating rod sleeve, the electric field strength on the surface of the insulating rod in the low air chamber and the inner surface of the insulating rod insulating sleeve can be optimized in both the closed and open states, thereby improving the insulation level of the entire circuit breaker.

[0020] Furthermore, the double air chamber structure of the present invention performs inflation and gas gauge pressure monitoring from the bottom end of the lower pole, which is safer and more reliable.

[0021] Furthermore, the inflation ports of the high air chamber and the low air chamber are both located within the frame, so that the real-time monitoring of the gas inflation pressure can be achieved.

[0022] Furthermore, the moving end heat dissipation bracket and the outer shield are an integrated structure, and are designed and processed as a whole, which is not only beneficial to improving the insulation performance of the product but also saves installation steps and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a high-voltage double-chamber column type vacuum circuit breaker of the present invention; Figure 2 A schematic diagram of the gas flow path of the high gas chamber of the present invention; Figure 3 A schematic diagram of the gas flow path of the low gas chamber of the present invention; Figure 4 This is a schematic diagram of the installation position of the outer shield of the present invention; Figure 5 A schematic diagram of a specific implementation of the present invention; Figure 6 It is a stereogram of the outer shield; Figure 7 It is a half-section diagram of the outer shield; Figure 8 The figure is a schematic diagram of the positional relationship among the outer shield, the insulating rod, the lower bushing and the end of the insulating rod in the closed state of the present invention.

[0024] Symbols and descriptions of the accompanying drawings: 1. Frame, 2. Insulating rod, 3. Insulating rod sleeve, 4. Outer shield, 5. Contact spring, 6. Vacuum arc extinguishing chamber, 7. Static end supporting conductor, 8. Upper bushing, 9. Connecting flange, 10. Lower bushing, 11. Moving end supporting conductor, 12. Upper glue-mounted flange of lower bushing, 13. Lower glue-mounted flange of lower bushing, 14. Sealing ring, 15. Inner tube airtight flange, 16. Moving end heat dissipation bracket, 17. Glue-mounted flange, 18. High air chamber inflation port, 19. Mounting flange, 20. Low air chamber inflation port, 601. Moving end conductive rod, 602. Bellows, 603. Moving contact, 201. End of insulating rod. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be another element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be another element centered thereon at the same time. The terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. used herein indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] Explanation of relevant terms Vacuum interrupter: As a key component of the circuit breaker to extinguish the arc, it cooperates with the operating mechanism to form the breaking capacity, and changes a certain point in the power grid from the current conduction state to the current disconnection state.

[0030] Low air chamber: gas passage with inflation pressure of 0.1-0.2MPa.

[0031] High air chamber: gas channel with inflation pressure of 0.4-0.8MPa.

[0032] Pole: The circuit breaker body structure with epoxy casting as the supporting structure, equipped with vacuum arc extinguishing chamber, insulating pull rod, dynamic and static end conductive parts, etc.

[0033] The present invention designs a high-voltage double-chamber column vacuum circuit breaker, and specially designs an outer shield in the column vacuum circuit breaker. Through the matching design of the outer shield, the insulating cylinder, the insulating rod, and the insulating rod sleeve, the electric field strength on the surface of the insulating rod in the low gas chamber and the inner surface of the insulating cylinder of the insulating rod is optimized, and the insulation level of the entire circuit breaker is improved. At the same time, since the gas filling port is located in the frame, real-time monitoring of the gas filling pressure can be achieved.

[0034] like Figure 1 As shown, a high-voltage double-chamber column vacuum circuit breaker structure provided by the present invention includes: a frame 1, an insulating rod 2, an insulating rod sleeve 3, an outer shield 4, a contact spring 5, a vacuum arc extinguishing chamber 6, a static end support conductor 7, an upper bushing 8, a connecting flange 9, a lower bushing 10, a moving end support conductor 11, a lower bushing upper glue-mounted flange 12, a lower bushing lower glue-mounted flange 13, a sealing ring 14, an inner tube airtight flange 15, a moving end heat dissipation bracket 16, a glue-mounted flange 17, a high air chamber inflation port 18, a mounting flange 19 and a low air chamber inflation port 20. An insulating rod sleeve 3 is coaxially arranged outside the insulating rod 2. The upper end of the insulating rod 2 ( Figure 1 An outer shield 4 is arranged close to the outer periphery of the lower bushing 10 (right side in the middle), and the outer shield 4 is located in the high air chamber, and the upper end of the outer shield 4 is connected to the moving end heat dissipation bracket 16. The vacuum arc chamber 6 and the static end support conductor 7 are fixedly connected.

[0035] Specifically: like Figure 2 As shown, in a high-voltage double-chamber column type vacuum circuit breaker structure of the present invention: the lower end of the lower casing 10 ( Figure 2The left side in the middle) is installed on the vacuum circuit breaker frame 1 through the lower casing lower glue-mounted flange 13, and the upper end is connected through the lower sleeve upper glue-mounted flange 12, the moving end support conductor 11 and the upper casing 8 respectively, to ensure the external support and strength of the circuit breaker. At the same time, the lower casing lower glue-mounted flange 13 and the moving end support conductor 11 are provided with openings, which can be inflated to allow gas to flow in the cavity of the lower casing 10 and the upper casing 8 of the vacuum circuit breaker. The cavity is usually filled with insulating gas, such as environmentally friendly gas, such as nitrogen, dry air, etc., and the inflation pressure is maintained above 0.4MPa, which is called a high gas chamber.

[0036] like Figure 3 As shown, in a high-voltage double-chamber column vacuum circuit breaker structure of the present invention: the lower end of the insulating pull rod 2 is connected to the mechanism located in the frame 1, the upper end of the insulating pull rod 2 is connected to the contact spring 5, the contact spring 5 is connected to the movable end conductive rod 601 of the vacuum arc chamber 6 through a threaded connection, the upper end of the movable end conductive rod 601 is welded with a movable contact 603, and the movable end conductive rod 601 is welded with a bellows 602, and this part is a kinematic chain. The lower casing lower glue flange 13 is fixedly connected to the lower casing 10, the lower casing 10 is connected to the upper casing 8 through the movable end support conductor 11, and the movable end support conductor 11 is secondly installed on the end face of the vacuum arc chamber 6, all connections of this part are sealed by a sealing ring, and the lower casing 10, the movable end support conductor 11 and the upper casing 8 form a support chain. The annular space between the kinematic chain and the support chain is connected, and an insulating pull rod sleeve 3 is provided outside the insulating pull rod 2 to form a sealed low-pressure air chamber. The gas can be filled into the bellows 602 of the vacuum interrupter 6 from the end of the insulating rod 2 through the gap between the insulating rod 2 and the insulating rod sleeve 3, so that the bellows 602 of the vacuum interrupter is located in the low-pressure gas chamber. The insulating rod sleeve is an epoxy tube.

[0037] like Figure 4 As shown, in a high-voltage double-chamber column vacuum circuit breaker structure of the present invention, the annular cavity of the low air chamber is formed between the insulating rod 2 and the insulating rod sleeve 3, the inner cavity of the moving end supporting conductor 11 and the inner cavity of the bellows 602 form a low air chamber, and the insulating rod sleeve 3 and the upper glue-mounted flange 12 of the lower sleeve form a high air chamber. The high air chamber is provided with an outer shield 4 near the vacuum arc extinguishing chamber 6, and one end of the outer shield 4 is fixedly connected to the moving end heat dissipation bracket 16. The outer shield 4 can improve the field strength of the outer surface of the insulating rod 2 and the inner surface of the insulating rod sleeve 3 in the low air chamber.

[0038] Example 1 like Figure 5As shown, a high-voltage double-chamber column vacuum circuit breaker structure of the present invention is specifically implemented as follows: the lower end of the lower bushing 10 is installed on the frame 1 equipped with the mechanism, and the upper end of the lower bushing 10 is installed on the moving end heat dissipation bracket 16. The moving end heat dissipation bracket 16 and the outer shield 4 can be designed and processed as a whole, saving installation procedures, and the integrated design is more conducive to improving the insulation performance of the product; the moving end heat dissipation bracket 16 is connected to the moving end support conductor 11 through threads, and the moving end support conductor 11 is fixedly connected to the upper bushing 8 through the connecting flange 9 to form the entire external support circuit. The lower end of the insulating pull rod 2 is connected to the mechanism 1, and the upper end of the insulating pull rod 2 is connected to the contact spring 5 through threads; the lower end of the insulating pull rod sleeve 3 is airtightly connected to the mounting flange 19 on the frame 1 through the glue-fitting flange 17, and the upper end of the insulating pull rod sleeve 3 is connected to the inner tube airtight flange 15 through plug-in, and the plug-in part is sealed with a sealing ring 14. The inner tube airtight flange 15 and the moving end support conductor 11 are connected by bolts. The frame 1 is provided with a high air chamber inflation port 18 and a low air chamber inflation port 20. The high air chamber inflation port 18 is connected to the high air chamber, and the low air chamber inflation port 20 is connected to the low air chamber. The high air chamber can be inflated from the high air chamber inflation port 18, and the low air chamber can be inflated from the low air chamber inflation port 20. The high air chamber inflation port 18 and the low air chamber inflation port 20 are located inside the frame 1, which is convenient for gas pressure monitoring during use.

[0039] like Figure 6 and Figure 7 As shown, the material of the outer shield 4 is metal. The outer shield includes a cylinder 41 with two ends opened, one end of the cylinder 41 is provided with an arc-shaped flange 42 rolled inward, and the end of the outer shield 4 without the flange is fixedly connected to the moving end heat dissipation bracket 16. The flange 42 can improve the electric field distribution, more effectively limit the electric field coupling interference within the shield body, prevent it from spreading outward, and at the same time enhance the mechanical strength and durability of the shielding cover.

[0040] like Figure 8As shown, in a high-voltage double-chamber column vacuum circuit breaker structure, the matching dimensions of the outer shield 4, the lower bushing 10 and the insulating rod 2 are as follows: the diameter difference D1-D2 between the outer diameter D2 of the outer shield 4 and the inner diameter D1 of the lower bushing = (10-50) mm; so that the outer shield 4 can protect the inner wall of the insulating rod 2 while keeping a certain distance from the lower bushing 10 in the circumferential direction to prevent the outer shield 4 from having an adverse effect on the lower bushing 10; the radius R of the outer shield 4 flange is 10-30 mm, under this size, it can improve the electric field without causing the outer shield 4 and the protective insulating rod 2 is too close; the length L1 of the lower end of the outer shield 4 from the end face of the moving end heat dissipation bracket 16 is (0.5~2)×D1; when the insulating rod end 201 is in the open position, the distance L2 from the insulating rod end 201 to the lower end face of the outer shield 4 must be greater than L1 (i.e. L2>L1), so that in the open state, the position of the insulating rod end 201 does not exceed the lower end of the outer shield to ensure the shielding effect. If L2>L1 cannot be made during engineering design, then L2 must be at least greater than half of L1, i.e. L1>L2≥0.5×L1.

[0041] Example 2 The present embodiment provides a pole for a high-voltage double-chamber column vacuum circuit breaker, comprising a lower bushing 10, an insulating rod sleeve 3, an insulating rod 2 and an outer shield 4. The lower bushing 10 is provided with an insulating rod sleeve 3, the insulating rod 2 is provided in the insulating rod sleeve 3, and an outer shield 4 is provided between the insulating rod sleeve 3 and the insulating rod 2. The structure of the outer shield 4 is the same as that in the first embodiment.

[0042] The term "consisting of" describing a combination shall include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe a combination of elements, ingredients, parts or steps herein also contemplates embodiments that consist essentially of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any of the attributes described that "may" be included are optional.

[0043] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0044] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A high voltage double chamber column type vacuum circuit breaker structure, characterized in that: The invention comprises an insulating rod (2), an upper bushing (8) and a lower bushing (10), wherein an insulating rod sleeve (3) is arranged in the lower bushing (10), an insulating rod sleeve (3) is arranged in the insulating rod sleeve (3), an outer shield (4) is arranged between the insulating rod sleeve (3) and the insulating rod (2), and the outer shield (4) is arranged outside one end of the insulating rod sleeve (3) close to the vacuum arc extinguishing chamber (6); the first end of the lower bushing (10) is mounted on the frame (1), and the second end is connected to the upper bushing (8), the vacuum arc extinguishing chamber (6) is arranged in the upper bushing (8), the first end of the insulating rod (2) is connected to the frame (1), and the insulating rod sleeve (3) is connected to the frame (1). The first end of the vacuum arc extinguishing chamber (6) is connected to the movable end conductive rod (601), and the second end is connected to the movable end conductive rod (601) of the vacuum arc extinguishing chamber (6). The movable end conductive rod (601) is provided with a bellows (602). The first end of the vacuum arc extinguishing chamber (6) is equipped with a movable end supporting conductor (11), and the second end is equipped with a static end supporting conductor (7), so as to form a supporting chain. The annular cavity between the supporting chain and the upper sleeve (8), and the annular cavity between the insulating rod sleeve (3) and the lower sleeve (10) are connected to form a high air chamber. The annular cavity between the insulating rod sleeve (3) and the insulating rod (2), the inner cavity of the movable end supporting conductor (11), and the inner cavity of the bellows (602) form a low air chamber.

2. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: The outer shield (4) comprises a cylinder (41), the cylinder (41) having openings at both ends, and an inwardly rolled flange (42) being provided at one opening.

3. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: The insulating pull rod (2) is connected to the movable end conductive rod (601) of the vacuum interrupter (6) via a contact spring (5).

4. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: The first end of the insulating pull rod sleeve (3) is airtightly connected to the mounting flange (19) on the frame (1) via an epoxy casting (17), and the second end is connected to the inner tube airtight flange (15) by plugging. The plugging portion is sealed with a sealing ring (14). The inner tube airtight flange (15) is fixedly connected to the mounting movable end support conductor (11).

5. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: The frame (1) is provided with a high air chamber inflation port (18) and a low air chamber inflation port (20); the high air chamber inflation port (18) is connected to the high air chamber, and the low air chamber inflation port (20) is connected to the low air chamber.

6. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: The radius of the flange of the outer shield (4) is 10 mm to 30 mm.

7. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: The difference between the outer diameter of the outer shield (4) and the inner diameter of the lower sleeve (10) is 10 mm to 50 mm; the length of the lower end of the outer shield (4) from the end face of the moving end heat dissipation bracket (16) is 0.5 to 2 times the inner diameter of the lower sleeve; the moving end heat dissipation bracket (16) is installed between the upper sleeve (8) and the lower sleeve (10).

8. A high voltage double chamber column type vacuum circuit breaker structure according to claim 1, characterized in that: When the switch is opened, the distance between the end of the insulating pull rod and the lower end surface of the outer shield (4) is greater than the length between the lower end of the outer shield (4) and the end surface of the moving end heat dissipation bracket (16).

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