Vacuum circuit breaker

Abstract

The present invention relates to a vacuum circuit breaker capable of improving structural stability and reducing a required space by reducing a distance from a pressure vessel to a driving part. According to one embodiment, a vacuum circuit breaker may include: a pressure vessel filled with an insulating gas of a predetermined pressure; a vacuum arc-extinguishing chamber provided inside the pressure vessel and having a fixed electrode and a movable electrode in a vacuum tube in a vacuum state; and a spring module, one side of which is connected to an end portion of the movable electrode through an insulating link, which moves through the pressure vessel to transmit a driving force of the driving portion to the movable electrode while maintaining airtightness, and which is equipped with a spring that applies a contact pressure to the movable electrode when the contact is closed.

Description

Technical Field

[0001] The present disclosure relates to a vacuum circuit breaker capable of reducing a distance from a pressure vessel to a driving part to increase structural stability and reduce a required space. Background Art

[0002] Generally, a vacuum circuit breaker may be a circuit breaker installed in a high-voltage power system to protect the power system by breaking the circuit when dangerous conditions such as short circuit, overcurrent, etc. occur, and may be designed by utilizing excellent insulation performance and arc extinguishing capability in a vacuum state.

[0003] The core component of such a vacuum circuit breaker may be a vacuum interrupter, which may include a fixed electrode and a movable electrode. The movable electrode may contact or separate with the fixed electrode in a sealed vacuum tube, and may perform circuit energization and circuit breaking functions by contacting and separating the fixed electrode and the movable electrode.

[0004] The interior of the vacuum interrupter can be in a vacuum state, while its exterior can be surrounded by a pressure vessel, to which gas pressure can be applied. Therefore, to transmit the driving force of a driving unit located outside the pressure vessel to the movable electrode, a movable rod can be interposed between the driving unit and the movable electrode. Furthermore, a contact pressure spring can be provided between the driving unit and the movable rod to transmit contact pressure during the engagement of the movable electrode.

[0005] In this case, since the contact pressure spring can be installed in the end of the movable rod outside the pressure vessel, the driving part should be arranged very far from the pressure vessel or very high, which causes structural instability of the entire device and increases unnecessary space. Summary of the Invention Technical issues

[0006] An object of the present disclosure is to provide a vacuum circuit breaker capable of reducing the distance from a pressure vessel to a driving portion to increase structural stability and reduce required space. Solution to the problem

[0007] A vacuum circuit breaker according to an embodiment of the present disclosure may include: a pressure vessel filled with an insulating gas at a predetermined pressure; a vacuum interrupter disposed within the interior space of the pressure vessel and having a fixed electrode and a movable electrode in a vacuum tube in a vacuum state; and a spring module, one side of the spring module being connected to the end of the movable electrode via an insulating link and having a spring that applies contact pressure to the movable electrode when the movable electrode is inserted. The spring module can penetrate the pressure vessel and move within the pressure vessel while maintaining airtightness to transmit the driving force of the driving unit to the movable electrode.

[0008] The spring module may include: a shell, one side of the shell is closed and the other side is open; a guide, the guide receiving a driving force of the driving part to reciprocate along the inner circumferential surface of the shell in the internal space of the shell; a spring, one end of the spring is supported by the inner surface of the closed side of the shell and the other end is supported by the guide; and a stopper installed on the other open side of the shell to limit the movement of the guide. Advantageous Effects of the Invention

[0009] According to an embodiment of the present disclosure, the stroke of the spring module can be confirmed and adjusted outside the pressure vessel, and the distance from the pressure vessel to the driving part can be reduced to obtain the effect of ensuring the operation and structural stability of the vacuum circuit breaker.

[0010] Furthermore, according to an embodiment of the present disclosure, when the driving part is disposed above the pressure vessel, the installation height of the driving part may be lowered to eliminate unnecessary generation of a required space. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a diagram illustrating a vacuum circuit breaker according to an embodiment of the present disclosure.

[0012] Figure 2 is an enlarged cross-sectional view showing a spring module. DETAILED DESCRIPTION

[0013] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. When adding reference numerals to components of each figure, it should be noted that even if the same components are shown in different figures, the same symbols are given as much as possible.

[0014] Figure 1 is a diagram illustrating a vacuum circuit breaker according to an embodiment of the present disclosure.

[0015] The vacuum circuit breaker according to an embodiment of the present disclosure may include a pressure vessel 10 , a vacuum interrupter 20 , and a spring module 30 .

[0016] The pressure vessel 10 may be a sealed container accommodating a vacuum interrupter 20 of a vacuum circuit breaker. An outer space of the pressure vessel may be subjected to atmospheric pressure, and an inner space of the pressure vessel may be filled with an insulating gas having a pressure equal to or higher than atmospheric pressure.

[0017] The pressure vessel 10 may have a through hole 11 formed on one side so that the spring module 30 can pass through the pressure vessel and reciprocate in the pressure vessel. A sealing member 12 for maintaining internal airtightness of the pressure vessel may be interposed between the through hole and the spring module.

[0018] The vacuum interrupter 20 may be disposed within the pressure vessel 10 and may include a fixed electrode 22 and a movable electrode 23 mounted within a vacuum tube 21. The vacuum tube may be formed of, for example, a cylindrical member made of an insulating material, but is not limited thereto. The interior of the vacuum tube may be in a vacuum state close to 0 bar.

[0019] In the vacuum interrupter 20 , the fixed electrode 22 may be installed to be fixed in the vacuum tube 21 .

[0020] In the vacuum interrupter 20 , the movable electrode 23 can reciprocate in the axial direction, and one end portion can contact or separate from the fixed electrode 22 , while the other end portion can protrude outward through the through hole 24 of the vacuum tube 21 .

[0021] The vacuum interrupter 20 may further include a bellows 25 having one side fixed to the vacuum tube 21 and configured to seal the gap between the through hole 24 of the vacuum tube and the movable electrode 23. The bellows may be contracted and extended in the axial direction so that the length in the axial direction may vary.

[0022] For example, the bellows 25 may be installed so that one end surrounds the through hole 24 and the other end surrounds the outer peripheral surface of the movable electrode 23. The bellows may be provided in this manner so that the internal space of the vacuum tube 21 can be maintained in a vacuum state even if the bellows expands and contracts according to the operation of the movable electrode.

[0023] Therefore, the bellows 25 can separate the vacuum pressure in the vacuum interrupter 20 and the gas pressure P in the pressure vessel 10 .

[0024] Figure 2 FIG is an enlarged cross-sectional view showing the spring module. Figure 2 As shown, the spring module 30 may include a housing 31 , a guide 32 , a spring 33 and a stopper 34 .

[0025] The housing 31 may be formed as a substantially cylindrical member having one side closed and the other side open to safely accommodate and protect the guide 32 and the spring 33 therein.

[0026] On the closed side, the outer surface of the housing 31 may be provided with a hinge portion 35 formed to protrude and connected to an end portion of the movable electrode 23 via an insulating link 26 .

[0027] On the other side of the opening, the inner surface of the housing 31 may be equipped with a stopper 34. For example, an internal thread may be formed on the inner circumferential surface of the housing 31, and the stopper 34 may be threadedly coupled to the housing accommodating the guide 32 and the spring 33 to prevent the guide and the spring from falling off and to limit the movement of the guide.

[0028] The housing 31 can reciprocate in the axial direction while maintaining the internal airtightness of the pressure vessel 10. To this end, the housing can be installed to slide through the inside of the sealing member 12 installed in the through hole 11 of the pressure vessel in a low friction state.

[0029] In addition, by coupling one end of the insulating link 26 with the hinge portion 35 (for example, through a pin 6) so that one end of the insulating link 26 and the hinge portion 35 can rotate relative to each other, the shell 31 can be connected to the other end of the movable electrode 23, so that the driving force of the driving portion 5 can be transmitted to the movable electrode.

[0030] The insulating link 26 may be formed of an insulating material to electrically insulate the movable electrode 23 and the driving portion 5 , and may transmit a driving force from the housing 31 of the spring module 30 to the movable electrode 23 .

[0031] The guide member 32 may include a plate-shaped support portion 37 having a predetermined thickness in the middle portion. On one side of the support portion, a barrier 38 extending from the edge of the support portion may be formed. On the other side of the support portion, a connection portion 39 extending from the center portion of the support portion in the opposite direction of the barrier may be formed.

[0032] The barrier 38 may be formed in a plate shape, such as a flat plate or a curved plate, to partition the space therein. The connection portion 39 may be formed in a rod shape extending to a predetermined length, for example.

[0033] The guide 32 (eg, the edge surface of the support portion 37 and the outer surface of the barrier 38) can reciprocate along the inner circumferential surface of the housing 31. As described above, the guide can be restricted from moving by the stopper 34 on the other side of the housing opening.

[0034] Optionally, at least one lubrication ring 36 may be inserted between the outer surface of the barrier 38 and the inner circumferential surface of the housing 31 for smooth movement of the guide. The lubrication ring may be mounted on the outer surface of the barrier or the inner circumferential surface of the housing and may be made of an engineering plastic material such as Teflon. etc.) are formed.

[0035] The spring 33 may be housed in the barrier 38 of the guide 32 . For example, the barrier of the guide may at least partially surround the spring.

[0036] The barrier 38 of the guide member 32 can hold and support the spring so that deformation (e.g., compression or extension) of the spring 33 is performed smoothly and linearly while reciprocating along the housing 31 when the driving force is transmitted to the guide member, and the barrier 38 of the guide member 32 can provide dynamic stability to restore the spring to its original stable position when the posture of the spring changes.

[0037] Furthermore, the spring 33 may be disposed between the support portion 37 of the guide member 32 and the inner surface of the closed side of the housing 31. One end of the spring 33 may be supported by the inner surface of the closed side of the housing, and the other end may be supported by the support portion of the guide member. In this manner, the support portion of the guide member may function as a spring seat for supporting the spring.

[0038] The spring 33 may be formed as, for example, a compression coil spring, but is not necessarily limited thereto, and any other form of spring may be employed as long as it elastically supports the guide member so that the guide member 32 moves within the housing 31 with a certain displacement.

[0039] When the movable electrode is inserted, the spring 33, which is under assembly load in the open state, compresses the electrode in the vacuum interrupter 20 with the operating load increased by the support portion 37 of the guide 32 and the housing 31, thereby providing conductive contact pressure between the electrodes. The contact pressure can offset the magnetic field force (repulsion force) that separates the contacts when a short-circuit current occurs and prevent resistance welding of the contacts.

[0040] The stopper 34 may be formed of an annular member having a through hole formed in a central portion and external threads formed on the outer peripheral surface in the transverse direction. As described above, the stopper may be threadedly coupled to the inner peripheral surface of the housing 31 that houses the guide 32 and the spring 33 to prevent the guide and the spring from separating and to restrict movement of the guide.

[0041] The structure of the stopper 34 and the connection relationship with the housing 31 are not necessarily limited to the above-described examples, and a stopper having any other shape may be employed as long as it is formed in an annular shape and restricts the movement of the guide 32 .

[0042] The connecting portion 39 of the guide member 32 can protrude from the shell 31 and the pressure vessel 10 through the through hole of the stop member 34, and the connecting portion is connected to the driving portion 5 via the driving link 51 and the rotation control rod 52 on the outside of the pressure vessel, and can receive driving force from the driving portion.

[0043] The rotation control rod 52 can be connected to the driving part 5 for rotation directly or through a speed reducer, etc. The driving part may include, for example, a motor, etc., and can generate power through a control command or a user's manual operation to rotate the rotation control rod.

[0044] The rotational force of the rotation control lever 52 can be transmitted to the drive link 51, and the position of the drive link can be changed according to the rotation of the rotation control lever, so that the connecting portion 39 of the guide member 32 can reciprocate in the axial direction of the guide member and the housing 31.

[0045] In this way, the spring module 30 can be connected to the end of the movable electrode 23 on one side via the insulating connecting rod 26 , and simultaneously can be connected to the drive portion 5 on the other side through the through-pressure vessel 10 .

[0046] Therefore, the spring module 30 can move through the sealing member 12 while maintaining airtightness by the driving force transmitted from the driving unit 5 to transmit the driving force of the driving unit to the movable electrode 23, and when the movable electrode is inserted, the spring module can apply contact pressure to the movable electrode through the spring 33 installed therein.

[0047] For example, the vacuum circuit breaker according to the embodiment of the present disclosure may be characterized by integrating the configuration and function of the movable rod and the pressure spring connected in series in the axial direction in the vacuum circuit breaker according to the related art into a single spring module 30 .

[0048] Therefore, compared with the vacuum circuit breaker according to the related art, the vacuum circuit breaker according to the embodiment of the present disclosure can ensure the stability of the operation and structure of the vacuum circuit breaker by reducing the distance from the pressure vessel 10 to the driving part 5, and can eliminate the required space that is unnecessarily generated.

[0049] In addition, a rod end fork 40 may be inserted between the connecting portion 39 of the guide 32 and the driving link 51. The rod end fork may include a head 42 having a pinhole formed therein and a fastening portion 43 extending from one side of the head and at least partially formed with threads.

[0050] One side of the driving link 51 and the head 42 of the rod end yoke 40 may be connected to each other, for example, by a pin 6 so as to rotate relative to each other.

[0051] like Figure 2 As shown, the connecting portion 39 of the guide 32 has an external thread formed at least partially on its outer peripheral surface and can be inserted and threadedly coupled to the fastening portion 43 of the rod end fork 40. Optionally, a nut 44 that prevents loosening can be further fastened to the connecting portion.

[0052] The configuration and coupling relationship of the connecting portion 39 and the fastening portion 43 are not necessarily limited to the above-described example, and the external thread and the internal thread may be formed so as to oppose each other. For example, a thread groove may be formed in the connecting portion, and the external thread may be formed at least partially on the outer circumferential surface of the fastening portion, so that the fastening portion can be inserted into and threadedly coupled to the thread groove of the connecting portion.

[0053] When the connecting portion 39 of the guide member 32 and the drive link 51 are connected via the rod end fork 40, the coupling length of the connecting portion threadedly coupled with the fastening portion of the rod end fork can be adjusted to check and adjust the stroke of the spring module 30 occurring during operation outside the pressure vessel 10.

[0054] As described above, according to the embodiments of the present disclosure, the stroke of the spring module can be checked and adjusted outside the pressure vessel, and the distance from the pressure vessel to the driving part can be reduced to obtain the effect of ensuring the stability of the operation and structure of the vacuum circuit breaker.

[0055] Furthermore, according to an embodiment of the present disclosure, when the driving part is disposed above the pressure vessel, the installation height of the driving part may be lowered to eliminate unnecessary generation of a required space.

[0056] The above description may be merely an example of the technical concept of the present disclosure, and those skilled in the art should understand that various modifications and changes may be made without departing from the essential characteristics of the present disclosure.

[0057] Therefore, the embodiments of the present disclosure are not intended to limit the technical ideas of the present disclosure, but are used to explain them, and the scope of the technical ideas of the present disclosure is not limited by these embodiments. The scope of protection of the present disclosure should be interpreted by the appended claims, and all technical ideas within the scope equivalent to them should be interpreted as included in the scope of rights of the present disclosure. Industrial Applicability

[0058] The present disclosure can be used in, for example, ultra-high voltage gas-insulated switchgear and the like.

Claims

1. A vacuum circuit breaker, comprising: a pressure vessel filled with an insulating gas at a predetermined pressure; a vacuum interrupter chamber provided in the inner space of the pressure vessel and having a fixed electrode and a movable electrode in a vacuum tube in a vacuum state; as well as A spring module, one side of which is connected to an end portion of the movable electrode via an insulating link, and having a spring for applying contact pressure to the movable electrode when the movable electrode is inserted, wherein the spring module penetrates the pressure vessel and moves within the pressure vessel while maintaining airtightness to transmit the driving force of the driving unit to the movable electrode.

2. The vacuum circuit breaker according to claim 1, wherein the spring module comprises: a housing having one side closed and the other side open; a guide member that receives a driving force of the driving portion to reciprocate along an inner circumferential surface of the housing in an internal space of the housing; the spring, one end of the spring being supported by the inner surface of the closed side of the housing and the other end being supported by the guide; as well as A stopper is installed at the other side of the opening of the housing to limit the movement of the guide.

3. The vacuum circuit breaker according to claim 2, wherein the housing is slidably mounted while maintaining airtightness in an inner space of a sealing member mounted in the through hole of the pressure vessel; and A hinge portion is provided on an outer surface of the closed side of the housing. The hinge portion is formed to protrude so as to be relatively rotatably coupled to the insulating link.

4. The vacuum circuit breaker according to claim 2, wherein the guide member comprises: a plate-shaped support portion having a predetermined thickness; a barrier extending from an edge of one side of the support portion; as well as A connecting portion extends from a central portion of the other side of the supporting portion in a direction opposite to a direction facing the barrier.

5. The vacuum circuit breaker according to claim 4, wherein: The spring is accommodated in the barrier and has the other end supported by the support portion, and The connecting portion protrudes from the pressure container through a through hole formed in the stopper, and is connected to the driving portion via a driving link.

6. The vacuum circuit breaker according to claim 5, wherein a rod end fork is inserted between the connecting portion and the driving link, The connecting portion is threadedly coupled to the fastening portion of the rod end fork, and One side of the driving link is coupled to the head of the rod end fork in a relatively rotatable manner. 7 . The vacuum circuit breaker of claim 4 , wherein at least one lubrication ring is inserted between an outer surface of the barrier and an inner peripheral surface of the housing for movement of the guide.

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