Vacuum interrupter

Abstract

The present invention relates to a vacuum interrupter, and more particularly to a vacuum interrupter in which a sleeve housing is installed at the other end of a movable rod, thereby allowing a portion of the sleeve that prevents buckling of the bellows when the movable rod is opened to be housed in a sleeve housing space inside the container.

Description

Technical Field

[0001] The present invention relates to a vacuum interrupter, and particularly to a vacuum interrupter in which a sleeve storage portion is provided at the lower part of a movable rod, so that a part of the sleeve that prevents the buckling of the bellows during the opening operation of the movable rod can be accommodated in a sleeve storage space inside the container.

Background Art

[0002] Generally, a vacuum circuit breaker is a type of circuit breaker provided in a high-voltage power system and configured to protect the power system by interrupting the circuit when dangerous situations such as short circuits and overcurrents occur. It is designed by taking advantage of its excellent insulation performance and arc extinguishing ability in a vacuum state.

[0003] In such a vacuum circuit breaker, the core component is one that performs the energization and interruption functions of the circuit within a vacuum tube sealed by a vacuum interrupter, and includes a fixed electrode and a movable electrode that can contact or separate from the fixed electrode. In particular, the portion where the fixed electrode and the movable electrode directly contact is called a contact point.

[0004] Here, in particular, since the movable electrode must perform a linear motion so as to be able to contact or separate from the fixed electrode while maintaining the vacuum state inside the vacuum interrupter, a bellows is provided around the movable electrode.

[0005] The inside of the vacuum interrupter is in a vacuum state, and the inside of the bellows is applied with atmospheric pressure or gas pressure. Since the gas pressure applied inside the bellows has a very large influence on the operating characteristics of the vacuum interrupter, the influence of the gas pressure must be considered in the design and capacity selection during operation.

[0006] The bellows can perform a contraction operation and an expansion operation in order to maintain airtightness during the lifting and lowering operation of the movable electrode, and plays a role in maintaining the airtightness of the movable electrode.

[0007] Furthermore, guides or sleeves may be provided inside the bellows to prevent buckling during contraction and expansion.

[0008] Conventional vacuum interrupters equipped with guides or sleeves are disclosed in Korean Patent Publication No. 10-1502265.

[0009] The conventional vacuum interrupter described above is provided with guides or sleeves to prevent buckling during the contraction and expansion of the bellows. However, because the guides or sleeves are provided only in a portion of the bellows, there is a problem in that it is not possible to prevent buckling in that portion during the expansion of the bellows.

[0010] Furthermore, if the guide or sleeve is made longer in the longitudinal direction to take into account the length of the bellows during expansion, there is a problem that the guide or sleeve will be exposed to the outside of the vacuum interrupter during the contraction of the bellows. [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] Therefore, the object of the present invention is to solve the problems of the prior art described above, and to provide a vacuum interrupter in which a sleeve storage section is provided at the lower part of the movable rod, and a portion of the sleeve that prevents buckling of the bellows when the movable rod is opened can be housed in the sleeve storage space inside the container. [Means for solving the problem]

[0012] According to the features of the present invention for achieving the above objective, the vacuum interrupter according to the present invention includes: a container made of an insulating material in which a vacuum is formed inside; a movable side seal cup coupled to one end of the container, having a movable rod through hole formed in the center, and closing one side of the container; a fixed side seal cup coupled to the other end of the container, and closing the other side of the container; a movable rod inserted into the movable rod through hole and provided to be movable, with a movable contact formed at its end; a fixed rod inserted through the fixed side seal cup and having a fixed contact formed at its end; a bellows-shaped tubular bellows provided so as to surround the outer circumferential surface of the movable rod and performing contraction and expansion movements in accordance with the movement of the movable rod; a tubular sleeve provided between the bellows and the movable rod and guiding the contraction and expansion movements of the bellows; and a sleeve storage section provided at the other end of the movable rod, having a sleeve storage space formed inside, and accommodating a part of the sleeve when the movable rod is opened.

[0013] The sleeve housing has a diameter larger than the diameter of the movable rod, is tubular in shape, one end is fixed to the end of the bellows, and the other end is fixed to the other end of the movable rod.

[0014] The sleeve is tubular in shape and is provided so as to surround the movable rod. It includes a sleeve body having a length corresponding to the expanded length of the bellows, and a sleeve fixing end formed by bending at one end of the sleeve body to fix the sleeve body to the movable side seal cup.

[0015] The joint between the fixed end of the sleeve and the movable side seal cup is further provided with a bush, which has a movable rod mounting hole formed on its outer surface, guides the movement of the movable rod, and prevents friction with the movable side seal cup.

[0016] The outer surface of the bush is further provided with a bush cover that is provided to cover the edge of the bush and to fix the bush to the movable side seal cup.

[0017] The other end of the bellows is further provided with a cup-shaped bellows protective shield, which is positioned at a predetermined distance along the outer circumferential surface of the bellows to prevent damage to the bellows by arcs generated inside the container. [Effects of the Invention]

[0018] The vacuum interrupter according to the present invention has the following effects:

[0019] In this invention, a sleeve storage section is provided at the lower part of the movable rod, and a portion of the sleeve that prevents buckling of the bellows when the movable rod is opened can be housed in the sleeve storage space inside the container.

[0020] Therefore, when the bellows contract, the lower part of the sleeve is housed in the sleeve storage compartment, which has the advantage of preventing the sleeve from being exposed to the outside of the container and allowing space to be secured for the sleeve's placement within the container.

[0021] Furthermore, because the sleeve that prevents buckling of the bellows operates within the container without being exposed to the outside, design changes and the addition of parts to secure the electrical path are minimized, resulting in a shorter manufacturing period and reduced manufacturing costs.

[0022] Furthermore, because the sleeve guides the entire operating section of the bellows, it can support and guide all the folds of the bellows, which has the effect of fundamentally preventing the reduction in the lifespan of the bellows due to buckling. [Brief explanation of the drawing]

[0023] [Figure 1] This is a cross-sectional view showing the configuration of a preferred embodiment of the vacuum interrupter according to the present invention. [Figure 2] This is a cross-sectional view showing the state in which the movable rod constituting an embodiment of the present invention is in the open position. [Figure 3]It is an enlarged perspective view showing a state in which a bush and a bush cover are installed on the upper surface of the movable-side seal cup constituting an embodiment of the present invention. [Figure 4] It is an enlarged cross-sectional view showing a state in which a bush and a bush cover are installed on the upper surface of the movable-side seal cup constituting an embodiment of the present invention. [Figure 5] It is a cross-sectional view showing a state in which the bellows constituting an embodiment of the present invention has contracted. [Figure 6] It is a cross-sectional view showing a state in which the bellows constituting an embodiment of the present invention has expanded. [Figure 7] It is an enlarged cross-sectional view showing a state in which a part of the sleeve is accommodated in the sleeve storage portion constituting an embodiment of the present invention. [Figure 8] It is an enlarged cross-sectional view showing a state in which the sleeve storage portion is coupled to the end of the bellows constituting an embodiment of the present invention.

Mode for Carrying Out the Invention

[0024] Hereinafter, several embodiments of the present invention will be described in detail based on exemplary drawings. It should be noted that when adding reference numerals to the components of each figure, the same components are given the same reference numerals as much as possible even if they are shown on other drawings. Further, in describing the embodiments of the present invention, when it is determined that a detailed description of a related known configuration or function will interfere with the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

[0025] Furthermore, when describing the components of the embodiments of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are used to distinguish a component from other components, and the terms do not limit the essence, order, or sequence of the component. When it is stated that a component is "linked," "combined," or "connected" to another component, it should be understood that the component may be directly linked or connected to the other component, but it may also be that other components are "linked," "combined," or "connected" between each component.

[0026] The configuration of the vacuum interrupter according to an embodiment of the present invention will be described below with reference to the attached drawings.

[0027] As shown in these figures, the vacuum interrupter according to the present invention comprises a container 10 made of an insulating material in which a vacuum is formed inside; a movable side seal cup 12 coupled to one end of the container 10, with a movable rod through hole 20 formed in the center, which closes one side of the container 10; a fixed side seal cup 14 coupled to the other end of the container 10, which closes the other side of the container 10; a movable rod 22 inserted into the movable rod through hole 20, provided to be movable up and down, with a movable contact 24 formed at its end; and a fixed contact 18 that penetrates the fixed side seal cup 14 and has a fixed contact at its end. The structure consists of a fixed rod 16, a bellows 32 which is shaped like a corrugated tube and is provided so as to surround the outer surface of the movable rod 22 and contracts and expands in accordance with the vertical movement of the movable rod 22, a tubular sleeve 34 which is provided between the bellows 32 and the movable rod 22 and guides the contraction and expansion of the bellows 32, and a sleeve storage section 40 provided at the lower part of the movable rod 22, which has a sleeve storage space 44 formed inside and houses a part of the sleeve 34 when the movable rod 22 is opened.

[0028] The container 10 is made of an insulating material and is formed in a hollow cylindrical shape. The material of the container 10 is mainly ceramic, which is an insulating material, but a variety of insulating materials other than ceramic can also be used. The inside of the container 10 is a part that opens and closes with a fixed rod 16 and a movable rod 22, which will be described later.

[0029] A movable side seal cup 12 and a fixed side seal cup 14 are installed on one side and the other side of the container 10, respectively. The movable side seal cup 12 and the fixed side seal cup 14 are cup-shaped and are installed to cover the open portion on one side and the open portion on the other side of the container 10, respectively.

[0030] The movable side seal cup 12 and the fixed side seal cup 14 play a role in completely sealing the container 10 by closing the open portion on one side and the open portion on the other side of the container 10, thereby creating a vacuum inside the container 10.

[0031] A fixing rod 16 is installed, passing through the fixed-side seal cup 14. The fixing rod 16 is a general fixing rod, and a detailed explanation is omitted. The fixing rod 16 is rod-shaped, elongated in one direction, and has a disc-shaped fixing contact 18 at one end. The fixing rod 16 is made of a conductive material and is the part to which the movable contact 24, described later, contacts and separates from the fixing contact 18 in accordance with the movement of the movable rod 22, described later.

[0032] As shown in Figure 4, a movable rod through-hole 20 is formed in the center of the movable side seal cup 12. The movable rod through-hole 20 has a shape corresponding to the cross-section of the movable rod 22, which will be described later, and is drilled through the center of the movable side seal cup 12.

[0033] The interior of the aforementioned movable rod through-hole 20 is the portion through which the movable rod 22, described later, is inserted and installed to be movable.

[0034] A movable rod 22 is installed inside the movable rod through hole 20. The movable rod 22 is a general movable rod, and a detailed description is omitted. The movable rod 22 is rod-shaped, is formed to be long in one direction, and has a movable contact 24 formed at one end. The movable rod 22 is made of a conductive material, preferably oxygen-free copper. The movable rod 22 is installed so as to be movable up and down with respect to the drawing by an operating unit (not shown) or a driving unit (not shown).

[0035] As the movable rod 22 moves up and down, the disc-shaped movable contact 24 moves to the edge of the lower end of the movable rod 22, thereby enabling a closing operation in which it comes into contact with the fixed contact 18, or an opening operation in which it separates from the fixed contact 18, as will be described later.

[0036] In other words, when the movable contact 24 contacts the fixed contact 18, current can flow from the power supply side and be transmitted to the load side, and when the movable contact 24 is separated from the fixed contact 18, the current transmitted from the power supply side to the load side can be interrupted.

[0037] A flat portion 26 is formed on the side surface of the movable rod 22. The flat portion 26 is formed in a flat shape on both upper sides of the movable rod 22 and is inserted into the movable rod through hole 20, thereby preventing the movable rod 22 from rotating.

[0038] A bush 28 is provided on the outer surface of the movable side seal cup 12. The bush 28 is a general bush, and a detailed explanation is omitted. The movable rod 22 can be inserted through the bush 28 by forming a movable rod mounting hole 29 in the center of the bush 28, and the bush 28 plays a role in guiding the movement of the movable rod 22.

[0039] A bush cover 30 is provided on the upper surface of the bush 28. As shown in Figure 4, the bush cover 30 is provided to cover the bush 28 along its edge and serves to fix the bush 28 to the center of the outer surface of the movable side seal cup 12.

[0040] Furthermore, the outer edge of the bush cover 30 is welded, so that the bush cover 30 can be firmly fixed to the outer surface of the movable side seal cup 12.

[0041] A bellows 32 is provided inside the container 10. The bellows 32 is in the shape of a retractable corrugated tube and is provided so as to surround the outer surface of the movable rod 22. One end of the bellows 32 is fixed to the inner surface of the movable side seal cup 12, and the other end of the bellows is fixed to a sleeve housing 40, which will be described later. The bellows 32 contracts and expands in accordance with the movement of the movable rod 22, and plays a role in sealing the movable rod 22.

[0042] In other words, even if the movable rod 22 moves up and down inside the container 10 with respect to the drawing, the bellows 32 is provided so as to surround the outer surface of the movable rod 22, allowing the movable rod 22 to move while maintaining the vacuum state of the container 10.

[0043] A sleeve 34 is provided between the movable rod 22 and the bellows 32. The sleeve 34 consists of a sleeve body 36 and a sleeve fixed end 38, etc.

[0044] The sleeve body 36 is formed in a tubular shape and elongated in one direction, and is provided to surround the movable rod 22. The sleeve body 36 is installed along the circumferential surface of the movable rod 22 for a length corresponding to the length of the expanded bellows 32. The sleeve body 36 is provided between the bellows 32 and the movable rod 22 and serves to prevent buckling of the bellows 32 during its contraction and expansion movements, and to guide the movement of the movable rod 22 and the contraction and expansion movements of the bellows 32.

[0045] A sleeve fixing end 38 is formed at one end of the sleeve body 36. The sleeve fixing end 38 protrudes horizontally along the upper end of the sleeve body 36, with reference to the drawing. The sleeve fixing end 38 is fixed to one side of the movable side seal cup 12 by welding, so that the sleeve body 36 can be fixed inside the container 10.

[0046] Furthermore, since the sleeve body 36 is installed to a length corresponding to the length of the bellows 32 when it is expanded, it guides the entire operating section of the bellows 32, thereby preventing buckling of the bellows 32 throughout its entire operating section.

[0047] A sleeve storage section 40 is provided at the other end of the bellows 32. The sleeve storage section 40 consists of a sleeve storage body 42, a bellows fixed end 46, a movable rod fixing groove 48, and the like.

[0048] The sleeve storage body 42, as shown in the drawing, is a hollow cylindrical shape with an open upper and lower end, and is positioned at a predetermined distance from the outer surface of the movable rod 22. A sleeve storage space 44 is formed between the sleeve storage body 42 and the movable rod 22, and as shown in Figure 4, the lower part of the sleeve 34 can be accommodated when the movable rod 22 retracts.

[0049] A bellows fixing end 46 is provided at one end of the sleeve housing body 42. The bellows fixing end 46 is bent to extend centrifugally along one end of the sleeve housing body 42. The upper surface of the bellows fixing end 46, relative to the drawing, is welded to the lower surface of the end of the bellows 32, relative to the drawing, so that the sleeve housing 40 can be firmly fixed to the bellows 32.

[0050] A movable rod fixing groove 48 is provided at the other end of the sleeve housing body 42. The movable rod fixing groove 48 is recessed in an arc shape along the inner edge of the other end of the sleeve housing body 42. A fixing rib 25, which protrudes from the other side of the movable rod 22, is connected to the inside of the movable rod fixing groove 48. The sleeve housing 40 can be firmly fixed to the movable rod 22 by welding with the fixing rib 25 of the movable rod 22 connected to the movable rod fixing groove 48.

[0051] In other words, the sleeve housing section 40 is fixed at one end to the other end of the bellows 32 and at the other end to the movable rod 22, so that the bellows 32 can contract and expand when the movable rod 22 is opened and closed.

[0052] In particular, when the movable rod 22 is opened, the bellows 32 retracts due to the upward movement of the movable rod 22, and the other end of the sleeve 34 provided between the movable rod 22 and the bellows 32 can be positioned inside the sleeve storage space 44 of the sleeve storage section 40.

[0053] A bellows protective shield 50 is provided on the lower surface of the bellows fixed end 46, relative to the drawing. The bellows protective shield 50 is cup-shaped and is positioned along the outer circumferential surface of the bellows 32 at predetermined intervals. The lower part of the bellows protective shield 50 is firmly fixed to the sleeve housing 40 by welding to the lower surface of the bellows fixed end 46. The bellows protective shield 50, by housing the lower part of the bellows 32, serves to prevent damage to the bellows 32 from arcs generated inside the container 10.

[0054] As described above, in the vacuum interrupter according to the present invention, a sleeve storage section 40 is installed on one side of the movable rod 22, and a portion of the sleeve 34 that prevents buckling of the bellows 32 when the movable rod 22 is opened can be housed in the sleeve storage space 44 inside the container 10.

[0055] Therefore, when the bellows 32 contracts, the other end of the sleeve 34 is housed in the sleeve storage section 40, which has the advantage of ensuring that the sleeve 34 is not exposed to the outside of the container 10 and that space for the sleeve 34 can be secured inside the container 10.

[0056] Furthermore, since the sleeve 34 that prevents buckling of the bellows 32 operates within the container 10 without being exposed to the outside, design changes and the addition of parts to secure the power supply lines can be minimized, thus shortening the manufacturing period and reducing manufacturing costs.

[0057] Furthermore, since the sleeve 34 guides the entire operating section of the bellows 32, the sleeve 34 can support and guide all the folds of the bellows 32, thereby fundamentally preventing a reduction in the lifespan of the bellows 32 due to buckling.

[0058] Having stated above that all components constituting the embodiments of the present invention operate either as a single unit or in combination, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all components can also operate in a selective combination of one or more units. Furthermore, terms such as “includes,” “constitutes,” or “has,” as described above, mean that the component may be inherent, unless otherwise specifically contradicted, and should be interpreted as including other components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as those defined in dictionaries, should be interpreted as corresponding to their meaning in the context of the relevant art, and not in an ideal or overly formal sense unless explicitly defined in the present invention.

[0059] The above description is merely illustrative of the technical concept of the present invention, and a person with ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed herein are for illustrative purposes only, not to limit the technical concept of the present invention, and these embodiments do not limit the scope of the technical concept of the present invention. The scope of protection of the present invention should be interpreted in accordance with the following claims, and all technical concepts within an equivalent scope should be interpreted as being included in the scope of the rights of the present invention.

[0060] In the illustrated embodiment, the end of the sleeve housing 40 is fixed to the fixing rib 25 of the movable rod 22. However, the end of the sleeve housing 40 may be directly fixed to the outer surface of the other end of the movable rod 22.

[0061] In the illustrated embodiment, the bellows protective shield 50 is configured to accommodate the lower part of the bellows 32 relative to the drawing, and to prevent damage to the bellows 32 by arcs generated inside the container 10. However, the bellows protective shield 50 can be installed to extend not only to the lower part of the bellows 32 relative to the drawing, but also to the upper part of the bellows 32, thereby preventing damage from arc generation over the entire length of the bellows 32.

Claims

1. A container made of insulating material, in which a vacuum is formed inside, A movable side seal cup is attached to one end of the container, has a movable rod through hole formed in the center, and closes one side of the container. A fixed-side sealing cup is coupled to the other end of the container and closes the other side of the container, A movable rod is inserted into the aforementioned movable rod through hole and provided to be movable, with a movable contact formed at its end, A fixing rod is inserted through the aforementioned fixed-side seal cup, with a fixed contact point formed at its end, A bellows, which is shaped like a corrugated tube and is provided so as to surround the outer surface of the movable rod, and which contracts and expands in accordance with the movement of the movable rod, A tubular sleeve is provided between the bellows and the movable rod, and guides the contraction and expansion movements of the bellows. A vacuum interrupter comprising: a sleeve storage section provided at the other end of the movable rod, having a sleeve storage space formed inside, and a portion of the sleeve being housed when the movable rod is opened.

2. The aforementioned sleeve storage section is The vacuum interrupter according to claim 1, characterized in that it has a diameter even larger than the diameter of the movable rod, is tubular in shape, one end is fixed to the end of the bellows, and the other end is fixed to the other end of the movable rod.

3. The aforementioned sleeve is A sleeve body that is tubular in shape, is provided so as to surround the movable rod, and has a length corresponding to the length of the bellows when expanded, The vacuum interrupter according to claim 1, further comprising a sleeve fixing end formed by bending at one end of the sleeve body to fix the sleeve body to the movable side seal cup.

4. The vacuum interrupter according to claim 2, characterized in that a bush is further provided at the joint between the fixed end of the sleeve and the movable side seal cup, the bush having a movable rod mounting hole formed on its outer surface, which guides the movement of the movable rod and prevents friction with the movable side seal cup.

5. On the outer surface of the bush, The vacuum interrupter according to claim 4, further comprising a bush cover provided so as to cover the edge of the bush and for fixing the bush to the movable side seal cup.

6. The other end of the bellows is, The vacuum interrupter according to claim 1, characterized in that it is cup-shaped and is further provided with a bellows protective shield that is arranged at a predetermined distance apart along the outer surface of the bellows to prevent damage to the bellows by an arc generated inside the container.

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