Vacuum interrupter

Abstract

The present invention relates to a vacuum interrupter, and more particularly, to a vacuum interrupter in which a sleeve accommodating part is provided at the other end of a movable rod of the vacuum interrupter, so that a part of a sleeve for preventing buckling of a bellows can be accommodated in a sleeve accommodating space inside a container when an opening operation of the movable rod is performed.

Description

Technical Field

[0001] The present invention relates to a vacuum interrupter, and a sleeve receiving portion is provided at the bottom of the moving rod of the vacuum interrupter, so that when the moving rod performs an opening action, a part of the sleeve for preventing buckling of the bellows can be received in the sleeve receiving space inside the container. Background Art

[0002] Generally, a vacuum circuit breaker is a circuit breaker installed in a high-voltage power system, which protects the power system by cutting off the circuit in case of dangerous conditions such as short circuit or overcurrent, and its excellent insulation performance and arc extinguishing ability in a vacuum state are utilized in the design.

[0003] In such a vacuum circuit breaker, a vacuum interrupter is used as a core component, which performs the functions of energizing and cutting off the circuit as described above in a sealed vacuum tube, and includes: a fixed electrode, and a moving electrode that can contact or separate from the fixed electrode. In particular, the part where the fixed electrode and the moving electrode are in direct contact is called a contact point.

[0004] Among them, since the moving electrode especially needs to perform a linear motion to contact or separate from the fixed electrode while maintaining the vacuum state inside the vacuum interrupter, a bellows is provided around the moving electrode.

[0005] The inside of the vacuum interrupter is in a vacuum state, while atmospheric pressure or gas pressure is applied inside the bellows. Since the pressure of the gas applied inside the bellows has a very large impact on the operating characteristics of the vacuum interrupter, the impact generated by the gas pressure needs to be considered in terms of design or capacity selection during operation.

[0006] In order to maintain airtightness during the lifting action of the moving electrode, the bellows may perform a contraction action and an expansion action, and play a role in maintaining the airtightness of the moving electrode.

[0007] In addition, in order to prevent the bellows from buckling during the contraction action and the expansion action, a guide or a sleeve can be provided inside it.

[0008] The existing vacuum interrupter provided with a guide or a sleeve is disclosed in Korean Patent Publication No. 10-1502265.

[0009] In order to prevent buckling of the above-mentioned bellows during contraction and expansion actions, a guide or a sleeve is provided in the existing vacuum interrupter as described above. However, since the guide or the sleeve is only provided in a partial section of the above-mentioned bellows, when the above-mentioned bellows performs an expansion action, there is a problem that buckling of a partial section cannot be prevented.

[0010] In addition, when the guide or the sleeve is provided long in the longitudinal direction in consideration of the length of the above-mentioned bellows during the expansion action, when the above-mentioned bellows performs a contraction action, there is a problem that the guide or the sleeve is exposed outside the vacuum interrupter. Summary of the Invention

[0011] Problems to be Solved by the Invention

[0012] Therefore, an object of the present invention is to solve the problems of the prior art as described above, and aims to provide a vacuum interrupter in which a sleeve accommodating portion is provided at the bottom of a movable rod, so that when the movable rod is opened, a part of the sleeve for preventing buckling of the bellows can be accommodated in a sleeve accommodating space inside the container.

[0013] Solutions for Solving the Problems

[0014] According to the features of the present invention for achieving the above-mentioned object, the vacuum interrupter according to the present invention includes: a container made of an insulating material and having a vacuum formed inside; a movable-side sealing cup combined with one end of the above-mentioned container, having a movable rod through-hole formed in the center thereof, and used for closing one side of the above-mentioned container; a fixed-side sealing cup combined with the other end of the above-mentioned container and used for closing the other side of the above-mentioned container; a movable rod inserted into the above-mentioned movable rod through-hole and capable of moving, having a movable contact formed at the end of the above-mentioned movable rod; a fixed rod penetrating through the above-mentioned fixed-side sealing cup and having a fixed contact formed at the end of the above-mentioned fixed rod; a bellows in a corrugated tubular shape, provided to surround the outer peripheral surface of the above-mentioned movable rod, and performing contraction and expansion actions as the above-mentioned movable rod moves up and down; a sleeve in a tubular shape, provided between the above-mentioned bellows and the above-mentioned movable rod, and used for guiding the contraction and expansion actions of the above-mentioned bellows; a sleeve accommodating portion provided at the other end of the above-mentioned movable rod, and a sleeve accommodating space is formed inside the above-mentioned sleeve accommodating portion, and when the above-mentioned movable rod is opened, a part of the above-mentioned sleeve is accommodated.

[0015] The above-mentioned sleeve accommodating portion has a diameter larger than that of the above-mentioned movable rod and is in a tubular shape, one end of which is fixedly provided at the end of the above-mentioned bellows, and the other end is fixedly provided at the other end side of the above-mentioned movable rod.

[0016] The above-mentioned sleeve includes: a sleeve body, which is tubular and is arranged to surround the above-mentioned movable rod and has a length corresponding to the length after the expansion of the above-mentioned corrugated pipe; a sleeve fixed end, which is bent and formed at one end of the above-mentioned sleeve body and fixes the above-mentioned sleeve body to the above-mentioned movable side seal cup.

[0017] A bushing is also provided at the joint of the above-mentioned sleeve fixed end and the above-mentioned movable side seal cup. An opening for installing the movable rod is formed on its outer surface, so as to guide the movement of the above-mentioned movable rod and prevent friction with the above-mentioned movable side seal cup.

[0018] A bushing cover is further provided on the outer surface of the above-mentioned bushing. It is arranged to cover the above-mentioned bushing along the edge of the above-mentioned bushing and is used to fix the above-mentioned bushing to the above-mentioned movable side seal cup.

[0019] The other end of the above-mentioned corrugated pipe is also provided with a corrugated pipe protection cover, which is cup-shaped and is arranged at intervals along the outer peripheral surface of the above-mentioned corrugated pipe, so as to prevent damage to the above-mentioned corrugated pipe caused by the electric arc generated inside the above-mentioned container.

[0020] Advantages of the Invention

[0021] The vacuum interrupter according to the present invention has the following advantages:

[0022] In the present invention, a sleeve accommodation part is provided at the bottom of the movable rod. Thus, when the opening action of the movable rod is performed, a part of the sleeve used to prevent the buckling of the corrugated pipe can be accommodated in the sleeve accommodation space inside the container.

[0023] Therefore, when the corrugated pipe performs a contraction action, since the bottom of the sleeve is accommodated in the sleeve accommodation part, there is no need to expose the sleeve outside the container. Therefore, it has the advantage of ensuring a space for arranging the sleeve inside the container.

[0024] In addition, since the sleeve used to prevent the buckling of the corrugated pipe can work inside the container without being exposed to the outside, it is possible to minimize the components for ensuring design changes and increasing the current-carrying path. Therefore, it has the effects of shortening the manufacturing time and reducing the manufacturing cost.

[0025] In addition, by guiding the entire working range of the corrugated pipe through the sleeve, the sleeve can support and guide all the folds of the corrugated pipe, so as to fundamentally prevent the life attenuation caused by the buckling of the corrugated pipe. Description of the Drawings

[0026] Figure 1 It is a cross-sectional view showing the structure of a preferred embodiment of the vacuum interrupter according to the present invention.

[0027] Figure 2It is a cross-sectional view showing the state where the movable rod constituting the embodiment of the present invention is in the opening operation.

[0028] Figure 3 It is an enlarged perspective view showing the state where a bushing and a bushing cover are provided on the upper surface of the movable side seal cup constituting the embodiment of the present invention.

[0029] Figure 4 It is an enlarged cross-sectional view showing the state where a bushing and a bushing cover are provided on the upper surface of the movable side seal cup constituting the embodiment of the present invention.

[0030] Figure 5 It is a cross-sectional view showing the state where the bellows constituting the embodiment of the present invention is in the contraction operation.

[0031] Figure 6 It is a cross-sectional view showing the state where the bellows constituting the embodiment of the present invention is in the expansion operation.

[0032] Figure 7 It is an enlarged cross-sectional view showing the state where a part of the sleeve is accommodated in the sleeve accommodating portion constituting the embodiment of the present invention.

[0033] Figure 8 It is an enlarged cross-sectional view showing the state where the sleeve accommodating portion is coupled to the end of the bellows constituting the embodiment of the present invention. Detailed Description of the Embodiment

[0034] Some embodiments of the present invention will be described in detail below with reference to schematic diagrams. It should be noted that when adding reference numerals to the structures of the respective drawings, for the same structural elements, even when they are shown in other drawings, the same reference numerals should be used as much as possible. In addition, when describing the embodiments of the present invention, when it is considered that the specific description of the relevant well-known structures or functions is not conducive to understanding the embodiments of the present invention, the detailed description thereof will be omitted.

[0035] In addition, when describing the structural elements of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are only used to distinguish this structure from other structures, and the nature, order, or sequence of this structural element is not limited by its terms. When it is described that a certain structure "is connected", "is coupled", or "is in contact" with another structure, it should be understood that this structure can be directly connected or in contact with another structure, or there may be other structures "connected", "coupled", or "in contact" between the respective structures.

[0036] Hereinafter, the structure of the vacuum interrupter according to the embodiment of the present invention will be described with reference to the accompanying drawings.

[0037] As shown in these figures, the vacuum interrupter according to the present invention includes: a container 10 made of an insulating material and having a vacuum formed therein; a movable-side sealing cup 12 coupled to one end of the container 10, having a movable rod through-hole 20 formed in the central portion thereof and for closing one side of the container 10; a fixed-side sealing cup 14 coupled to the other end of the container 10 and for closing the other side of the container; a movable rod 22 inserted into the movable rod through-hole 20 in a vertically movable manner, with a movable contact 24 formed at the end of the movable rod 22; a fixed rod 16 penetrating through the fixed-side sealing cup 14, and having a fixed contact 18 formed at the end of the fixed rod 16; a bellows 32 formed in a corrugated tubular shape and disposed around the outer peripheral surface of the movable rod 22, and performing a contraction action and an expansion action as the movable rod 22 moves up and down; a sleeve 34 formed in a tubular shape, disposed between the bellows 32 and the movable rod 22, and guiding the contraction action and the expansion action of the bellows 32; a sleeve receiving portion 40 provided at the bottom of the movable rod, a sleeve receiving space 44 being formed inside the sleeve receiving portion 40, and when the movable rod 22 performs an opening action, receiving a part of the sleeve 34; etc.

[0038] The container 10 is made of an insulating material and has a hollow cylindrical shape. The material used for the container 10 is mainly ceramic, an insulating material, and in addition to the ceramic material, various materials that achieve insulation can also be applied. The fixed rod 16 and the movable rod 22 described later are provided inside the container 10, thereby forming a part for performing closing and opening actions.

[0039] A movable-side sealing cup 12 and a fixed-side sealing cup 14 are respectively provided on one side and the other side of the container 10. The movable-side sealing cup 12 and the fixed-side sealing cup 14 are provided in a cup (CUP) shape and respectively cover one open portion and the other open portion of the container 10.

[0040] The movable-side sealing cup 12 and the fixed-side sealing cup 14 close the one open portion and the other open portion of the container 10, thereby completely closing the container 10 so as to form a vacuum inside the container 10.

[0041] The fixed rod 16 is provided to penetrate through the fixed-side sealing cup 14. Since the fixed rod 16 is a conventional fixed rod, its detailed description is omitted. The fixed rod 16 is in a rod shape, is formed long in one direction, and has a disk-shaped fixed contact 18 formed at one end thereof. The fixed rod 16 is formed of a conductive material and serves as a part where the movable contact 24 described later contacts and separates from the fixed contact 18 as the movable rod 22 moves later.

[0042] AsFigure 4 As shown, a movable rod through-hole 20 is formed in the central portion of the above-mentioned movable side sealing cup 12. The above-mentioned movable rod through-hole 20 is formed in a shape corresponding to the cross-section of a movable rod 22 to be described later, and is formed through the center of the above-mentioned movable side sealing cup 12.

[0043] Inside the above-mentioned movable rod through-hole 20, there is provided a portion for movably penetrating the movable rod 22 to be described later.

[0044] A movable rod 22 is provided inside the above-mentioned movable rod through-hole 20. Since the above-mentioned movable rod 22 is a conventional movable rod, detailed description thereof is omitted. The above-mentioned movable rod 22 is in a rod shape and is formed long along a single direction, and a movable contact 24 is formed at one end thereof. The above-mentioned movable rod 22 is formed of a conductive material, and preferably, it can be formed of oxygen-free copper. The above-mentioned movable rod 22 is arranged to be movable up and down with reference to the drawing by an operation part (not shown) or a driving part (not shown).

[0045] As the above-mentioned movable rod 22 moves up and down, the above-mentioned movable contact 24 having a disk shape at the lower end of the above-mentioned movable rod 22 moves, so that a closing action of abutting against the above-mentioned fixed contact 18 or an opening action of separating from the fixed contact 18 to be described later can be realized.

[0046] That is, when the above-mentioned movable contact 24 contacts the above-mentioned fixed contact 18, current can flow from the power supply side and be transmitted to the load side, and when the above-mentioned movable contact 24 separates from the above-mentioned fixed contact 18, the current transmitted from the power supply side to the load side can be cut off.

[0047] A flat portion 26 is formed on the side surface of the above-mentioned movable rod 22. The above-mentioned flat portions 26 are respectively formed in a flat shape on both upper side surfaces of the above-mentioned movable rod 22, so that as it is inserted into the inside of the above-mentioned movable rod through-hole 20, the rotational movement of the above-mentioned movable rod 22 can be prevented.

[0048] A bushing 28 is provided on the outer surface of the above-mentioned movable side sealing cup 12. Since the above-mentioned bushing 28 is a conventional bushing, detailed description thereof is omitted. A movable rod mounting hole 29 is formed in the center of the above-mentioned bushing 28, so that the above-mentioned movable rod 22 can penetrate and be arranged in the above-mentioned movable rod mounting hole 29, and the above-mentioned bushing 28 has the function of guiding the movement of the above-mentioned movable rod 22.

[0049] A bushing cover 30 is provided on the upper surface of the above-mentioned bushing 28. As Figure 4 shown, the above-mentioned bushing cover 30 is arranged to cover the above-mentioned bushing 28 along the edge of the above-mentioned bushing 28, so as to play a role of fixing the above-mentioned bushing 28 to the center of the outer surface of the above-mentioned movable side sealing cup 12.

[0050] In addition, since the outer edge portion of the above-mentioned bushing cover 30 is welded, the above-mentioned bushing cover 30 can be firmly fixed to the outer surface of the above-mentioned movable-side seal cup 12.

[0051] A bellows 32 is provided inside the above-mentioned container 10. The above-mentioned bellows 32 is formed in a telescopic corrugated tubular shape and is arranged to surround the outer peripheral surface of the above-mentioned movable rod 22. One end portion of the above-mentioned bellows 32 is fixed to the inner surface of the above-mentioned movable-side seal cup 12, and the other end portion is fixed to a sleeve receiving portion 40 described later. The above-mentioned bellows 32 contracts and expands as the above-mentioned movable rod 22 moves, thereby serving to seal the above-mentioned movable rod 22.

[0052] That is, even if the above-mentioned movable rod 22 moves up and down inside the above-mentioned container 10 with reference to the drawings, since the above-mentioned bellows 32 is arranged to surround the outer peripheral surface of the above-mentioned movable rod 22, the movement of the above-mentioned movable rod 22 can be achieved while maintaining the vacuum state of the above-mentioned container 10.

[0053] A sleeve 34 is provided between the above-mentioned movable rod 22 and the above-mentioned bellows 32. The above-mentioned sleeve 34 includes a sleeve main body 36 and a sleeve fixed end 38, etc.

[0054] The above-mentioned sleeve main body 36 is tubular and is formed to be long in one direction and is arranged to surround the above-mentioned movable rod 22. The above-mentioned sleeve main body 36 is arranged to have a length corresponding to the length of the above-mentioned bellows 32 after expansion along the peripheral surface of the above-mentioned movable rod 22. The above-mentioned sleeve main body 36 is provided between the above-mentioned bellows 32 and the above-mentioned movable rod 22, so as to prevent buckling of the above-mentioned bellows 32 and guide the movement of the above-mentioned movable rod 22 and the contraction and expansion movements of the above-mentioned bellows 32 when the above-mentioned bellows 32 performs contraction and expansion actions.

[0055] A sleeve fixed end 38 is formed at one end of the above-mentioned sleeve main body 36. With reference to the drawings, the above-mentioned sleeve fixed end 38 protrudes horizontally along the upper end portion of the above-mentioned sleeve main body 36. The above-mentioned sleeve fixed end 38 is fixedly provided on one side of the above-mentioned movable-side seal cup 12 by welding, so that the above-mentioned sleeve main body 36 can be fixed to the inside of the above-mentioned container 10.

[0056] In addition, since the above-mentioned sleeve main body 36 is arranged to have a length corresponding to the length of the above-mentioned bellows 32 in the expanded state, so as to guide the entire working range of the above-mentioned bellows 32, buckling of the above-mentioned bellows 32 can be prevented throughout the entire working range of the above-mentioned bellows 32.

[0057] The other end of the above corrugated pipe 32 is provided with a sleeve accommodating portion 40. The above sleeve accommodating portion 40 includes a sleeve accommodating main body 42, a corrugated pipe fixed end 46, a movable rod fixing groove 48, etc.

[0058] Based on the attached drawings, the above sleeve accommodating main body 42 has a hollow cylindrical shape with its upper end and lower end open, and is arranged at a certain interval from the outer peripheral surface of the above movable rod 22. A sleeve accommodating space 44 is formed between the above sleeve accommodating main body 42 and the above movable rod 22. As Figure 4 shown, when the above movable rod 22 performs a contraction action, the lower side portion of the above sleeve 34 can be accommodated.

[0059] One end of the above sleeve accommodating main body 42 forms a corrugated pipe fixed end 46. The above corrugated pipe fixed end 46 is bent and formed in a manner of extending in the centrifugal direction along one end portion of the above sleeve accommodating main body 42. The upper surface of the above corrugated pipe fixed end 46 based on the attached drawings is welded and bonded to the bottom surface of the end of the above corrugated pipe 32 based on the attached drawings, so that the above sleeve accommodating portion 40 can be firmly fixed to the above corrugated pipe 32.

[0060] The other end of the above sleeve accommodating main body 42 forms a movable rod fixing groove 48. The above movable rod fixing groove 48 is recessed in an arc shape along the inner edge portion of the other end of the above sleeve accommodating main body 42. A fixing stop 25 protruding from the other side of the above movable rod 22 is combined inside the above movable rod fixing groove 48. By welding in a state where the fixing stop 25 of the above movable rod 22 is combined with the above movable rod fixing groove 48, the above sleeve accommodating portion 40 can be firmly fixed to the above movable rod 22.

[0061] That is, since one end portion of the above sleeve accommodating portion 40 is fixed to the other end portion of the above corrugated pipe 32, and the other end portion is fixed to the above movable rod 22, the contraction action and expansion action of the above corrugated pipe 32 can be realized when the above movable rod 22 performs an opening action and a closing action.

[0062] In particular, when the above movable rod 22 performs an opening action, the above corrugated pipe 32 performs a contraction action due to the rising action of the above movable rod 22, and the other end portion of the above sleeve 34 provided between the above movable rod 22 and the above corrugated pipe 32 can be located inside the sleeve accommodating space 44 of the above sleeve accommodating portion 40.

[0063] A bellows protection cover 50 is provided on the bottom surface of the fixed end 46 of the bellows based on the attached drawings. The bellows protection cover 50 is cup-shaped and is arranged at a certain interval along the outer peripheral surface of the bellows 32. The bottom of the bellows protection cover 50 is welded to the bottom surface of the fixed end 46 of the bellows, so as to be firmly fixed to the sleeve receiving portion 40. By accommodating the bottom of the bellows 32, the bellows protection cover 50 serves to prevent damage to the bellows 32 caused by the electric arc generated inside the container 10.

[0064] As described above, the vacuum interrupter according to the present invention is provided with a sleeve receiving portion 40 on one side of the movable rod 22, so that a part of the sleeve 34 for preventing buckling of the bellows 32 when the movable rod 22 performs an opening action can be accommodated in the sleeve receiving space 44 inside the container 10.

[0065] Therefore, when the bellows 32 performs a contraction action, since the other end of the sleeve 34 is accommodated in the sleeve receiving portion 40, there is no need to expose the sleeve 34 outside the container 10, so there is an advantage that a space for arranging the sleeve 34 can be ensured inside the container 10.

[0066] In addition, since the sleeve 34 for preventing buckling of the bellows 32 can work in the container 10 without being exposed to the outside, it is possible to minimize the addition of components for ensuring design changes and current-carrying paths, so the manufacturing time can be shortened and the manufacturing cost can be reduced.

[0067] In addition, the entire working range of the bellows 32 is guided by the sleeve 34, so that the sleeve 34 can support and guide all the folds of the bellows 32, so that the life attenuation caused by buckling of the bellows 32 can be fundamentally prevented.

[0068] As described above, although it is illustrated that all the structures constituting the embodiments of the present invention can be integrated or operate in a combined manner, the present invention is not limited to these embodiments. That is, within the scope of the object of the present invention, all its structures can be selectively combined into one or more and operate. And, in the case of no particularly contrary description, it is indicated that the constituent elements can include terms such as "including", "constituting" or "having" described above, so it should be understood that other constituent elements are not excluded, but other structural elements can be further included. Unless otherwise defined, all terms, including technical terms or scientific terms, have the same meaning as the ordinary understanding of those skilled in the art. The same as the predefined ones, ordinary terms should be understood to have the same meaning as the meaning expressed in the context of the related art. Without being explicitly defined in the present invention, they will not be understood as idealized or overly formalized meanings.

[0069] The above description only schematically illustrates the technical idea of the present invention. Therefore, those skilled in the art can make various modifications and deformations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not used to limit the technical idea of the present invention, but for the purpose of illustration, and the scope of the technical idea of the present invention will not be limited by such embodiments. Moreover, the protection scope of the present invention should be interpreted according to the following claims, and all technical ideas within the same scope should be understood to be included in the scope of the claims of the present invention.

[0070] In the illustrated embodiment, the end of the above-mentioned sleeve receiving portion 40 is arranged to be fixed to the fixed stop edge 25 of the above-mentioned movable rod 22. However, the end of the above-mentioned sleeve receiving portion 40 can also be directly fixed to the outer surface of the other end side of the above-mentioned movable rod 22.

[0071] In addition, in the illustrated embodiment, with reference to the drawings, the above-mentioned bellows protection cover 50 is arranged to accommodate the bottom of the above-mentioned bellows 32, so as to prevent damage to the bellows 32 caused by the electric arc generated inside the above-mentioned container 10. Moreover, with reference to the drawings, the above-mentioned bellows protection cover 50 can also be arranged to extend to the upper part of the above-mentioned bellows 32 in addition to the bottom of the above-mentioned bellows 32, so as to prevent damage caused by the electric arc generated in the entire section of the above-mentioned bellows 32.

Claims

1. A vacuum interrupter, comprising: a container made of insulating material and having a vacuum formed inside thereof; a movable-side sealing cup coupled to one end of the container, having a movable rod through-hole formed in its central portion and configured to close one side of the container; a fixed-side sealing cup coupled to the other end of the container and configured to close the other side of the container; a movable rod inserted into the movable rod through-hole and capable of moving, with a movable contact formed at an end of the movable rod; a fixed rod penetrating through the fixed-side sealing cup and having a fixed contact formed at an end of the fixed rod; a bellows formed in a corrugated tubular shape, disposed to surround an outer circumferential surface of the movable rod, and configured to perform a contraction action and an expansion action as the movable rod moves; a sleeve formed in a tubular shape and disposed between the bellows and the movable rod, configured to guide the contraction action and the expansion action of the bellows; a sleeve receiving portion provided at the other end of the movable rod, and having a sleeve receiving space formed inside thereof, and configured to receive a part of the sleeve when the opening action of the movable rod is performed.

2. The vacuum interrupter according to claim 1, wherein, the sleeve receiving portion has a diameter larger than a diameter of the movable rod and is formed in a tubular shape, with one end fixedly provided at a terminal end of the bellows and the other end fixedly provided at the other end side of the movable rod.

3. The vacuum interrupter according to claim 1, wherein, the sleeve includes: a sleeve body formed in a tubular shape, disposed to surround the movable rod, and having a length corresponding to a length after the bellows expands; a sleeve fixed end bent and formed at one end portion of the sleeve body, and configured to fix the sleeve body to the movable-side sealing cup.

4. The vacuum interrupter according to claim 2, wherein, at a joint portion between the sleeve fixed end and the movable-side sealing cup, there is further provided: a bushing having a movable rod mounting hole formed on an outer surface thereof, configured to guide the movement of the movable rod and prevent friction with the movable-side sealing cup.

5. The vacuum interrupter according to claim 4, wherein, on the outer surface of the bushing, there is further provided: a bushing cover disposed to cover the bushing along an edge of the bushing and configured to fix the bushing to the movable-side sealing cup.

6. The vacuum interrupter according to claim 1, wherein, at the other end portion of the bellows, there is further provided: a bellows protection cover formed in a cup shape and disposed at a certain interval along an outer circumferential surface of the bellows, configured to prevent damage to the bellows caused by an arc generated inside the container.

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