Switchboard having rotating shutter structure

A switchboard is provided having a rotating shutter structure that comprises: a switchboard body that is provided with a circuit breaker chamber into which a circuit breaker is inserted, and an open hole formed in the rear surface to expose a conductor part of a bushing assembly to the circuit breaker chamber; a shutter part that is rotatably installed in the switchboard body and opens/closes the open hole by rotating; and an operation unit that is installed in the switchboard body and rotates the shutter part when the circuit breaker is inserted into the circuit breaker chamber.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2020/004484, filed on Apr. 1, 2020, which claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2019-0159543, filed on Dec. 4, 2019, the contents of which are all hereby incorporated by reference herein in their entirety.

FIELD

The present disclosure relates to a switchboard having a pivotable shutter structure, and more particularly, to a switchboard having a pivotable shutter structure capable of achieving miniaturization while maintaining a set insulating distance.

BACKGROUND

In general, a switchboard is installed for various purposes such as operation or control of electric power in industrial sites such as power plants and substations, and operation of electric motors.

A circuit breaker and various electrical devices are installed in a housing of the switchboard. In general, the circuit breaker is housed inside a circuit breaker chamber of the switchboard.

In this regard, a structure to prevent contact of a conductive portion is required for safety of users when there is no circuit breaker in the circuit breaker chamber.

FIG.1is a perspective view showing a structure of a circuit breaker chamber formed inside a conventional switchboard,FIG.2is a perspective view showing a bushing assembly ofFIG.1,FIG.3is a perspective view showing a structure of a conventional circuit breaker assembly, andFIG.4is a perspective view showing a conventional shutter assembly.

Referring toFIG.1, a circuit breaker chamber1ais defined in a switchboard1. Bushing assemblies20and30are assembled to a rear face of the circuit breaker chamber1a. The shutter assembly is positioned on front faces of the bushing assemblies20and30as shown in the figure. The front faces of the bushing assemblies20and30are covered with the shutter assembly.

Referring toFIG.2, the bushing assemblies20and30are respectively composed of insulating material housing21and31and electrical conductors22and32. There is a risk of electric shock when a user touches the electrical conductors22and32in an active state thereof. Therefore, under actual usage conditions, the electrical conductors22and32are screened with the shutter assembly to protect the user from the electrical shock.

Referring toFIG.3, a circuit breaker assembly10has a main circuit11of the circuit breaker. The main circuit11of the circuit breaker has an electrical conductor12of the circuit breaker connected to the electrical conductors22and32of the bushing. In order for the above two electrical conductors22(32) and12to be connected to each other, the shutter assembly must operate. To this end, a shutter roller guide13is provided at each of both opposing sides of the circuit breaker10to open and close a space between the circuit breaker assembly10and the bushing assemblies20and30.

Referring toFIG.4, a conventional shutter assembly as described above has a structure in which upper and lower shutter plates60and61move up or down.

When the shutter roller guide13pushes shutter rollers41and51, an upper shutter plate drive lever40and a lower shutter plate drive lever50pivots.

At the same time, an upper shutter plate drive link42moves upward, and a lower shutter plate drive link52moves downward. Accordingly, the upper shutter plate60moves up, and the lower shutter plate61moves down.

FIG.5is a perspective view showing a position of the circuit breaker in a test position, andFIG.6is a perspective view showing an operation of the shutter assembly while the circuit breaker is moving to a service position.

Referring toFIG.5, when the circuit breaker10is inserted into the circuit breaker chamber1a, the circuit breaker10moves to the test position. At this time, the upper shutter plate60and the lower shutter plate61cover an entirety of the front faces of the bushing assemblies20and30.

As shown inFIG.6, while the circuit breaker10is moving to the service position, the upper shutter lever40pivots in a counterclockwise direction and the lower shutter lever50pivots in the clockwise direction due to contact between the shutter rollers41and51and the shutter roller guide13. Accordingly, the upper shutter plate60moves upward and the lower shutter plate61moves downward.

When the circuit breaker10has moved to the service position, the upper shuttle plate60and the lower shutter plate61has completed the ascending and descending motions, respectively, to fully open inlets of the bushing assemblies20and30. Then, the electrical conductor12of the moved circuit breaker10is connected to the electrical conductors22and32of the bushing assembly20and30.

As described above, conventionally, the upper shutter lever40pivots upward and the lower shutter lever50pivots downward due to the contact between the shutter rollers41and51and the shutter roller guide13.

Moreover, the upper shutter plate drive link42moves up and the lower shutter plate drive link52moves down. Accordingly, the upper shutter plate60moves upward along a vertical direction, and the lower shutter plate61moves downward along the vertical direction.

However, when the circuit breaker10has moved to the service position, the electrical conductor12for the circuit breaker and the upper shutter plate60and the lower shutter plate61are close to each other. Thus, in order to avoid mechanical interference with the electrical conductor12of the circuit breaker, the upper shutter plate60and the lower shutter plate61must move to a level where they may deviate from openings of the bushing assemblies20and30before collision.

That is, when the circuit breaker10is in the service position, a sufficient distance between the conductor12of the circuit breaker and the upper shutter plate60and the lower shutter plate61must be maintained to maintain air insulation between the conductor12of the circuit breaker and the upper shutter plate60and the lower shutter plate61.

In this regard, the conventional upper shutter plate60moves upward. Therefore, the upper shutter plate60moves up to a level which is away from the inlet to a position by a value greater than a predefined vertical dimension.

Therefore, the electrical conductors22and32of the bushing assemblies20and30are connected to the electrical conductor12of the circuit breaker. Thus, after power is connected thereto, breakdown of air electrical insulation between the conductor and a grounded upper shutter plate60may be prevented.

Conventionally, a movement distance of the upper shutter plate60should be a sufficient vertical dimension to secure an insulating distance from the plate60to the inlets of the bushing assemblies20and30. For this reason, an overall vertical dimension of the switchboard increases, so that the miniaturization of the switchboard may not be achieved.

SUMMARY

A purpose of the present disclosure is to provide a switchboard with a pivotable shutter structure in which a shutter that opens and closes the inlet of the bushing assembly has an opening and closing mechanism operating in a pivotable scheme to reduce a vertical dimension by which the shutter moves vertically to a value smaller than a predefined value when opening the inlet, thereby reducing a size of the switchboard.

Further, another purpose of the present disclosure is to provide a switchboard with a pivotable shutter structure in which a shutter that opens and closes the inlet of the bushing assembly has an opening and closing mechanism operating in a pivotable scheme and pivots along an inner side of the switchboard when opening the inlet, thereby securing a predefined insulating distance to the bushing assembly.

Purposes of the present disclosure are not limited to the above-mentioned purpose. Other purposes and advantages of the present disclosure that are not mentioned above may be understood based on following descriptions, and will be more clearly understood with reference to embodiments of the present disclosure. Further, it will be readily apparent that the purposes and advantages of the present disclosure may be realized using means and combinations thereof indicated in the Claims.

To achieve the above objects, the present disclosure provides a switchboard having a pivotable shutter structure.

There is provided a switchboard having a pivotable shutter structure, the switchboard comprising: a switchboard body having a circuit breaker chamber defined therein into which a circuit breaker is inserted, wherein an open hole is formed in a rear face of the switchboard body, wherein a conductor of a bushing assembly is exposed through the open hole to the circuit breaker chamber; a shutter pivotably installed on the switchboard body, wherein the shutter pivots to open or close the open hole; and an actuator installed on the switchboard body and configured to actuate the shutter to pivot as the circuit breaker is inserted into the circuit breaker chamber.

In one implementation, the shutter includes: a shutter plate having a plate shape and disposed in an inner space of the switchboard body, wherein an area size of the shutter plate is equal to or larger than an area size of the open hole by a predefined value; and a pair of support members respectively extending from both opposing ends of the shutter plate and along the inner space of the switchboard body, a distal end of each of the pair of support members is hinge-connected to each of both opposing sides of the switchboard body such that the hinge corresponds to a first pivot center of the shutter plate.

In one implementation, the hinge corresponding to the first pivot center is a first hinge, wherein the first hinge includes fastening means for coupling the distal end of each of the pair of support members to each of both opposing sides of the switchboard body in a pivotal manner.

In one implementation, a first through-hole is formed in each of both opposing side walls of the body defining the circuit breaker chamber, wherein the fastening means includes a fixing member, a connection member, a nut and a washer, wherein the fixing member has one end on an outer face of each of both opposing side walls of the body defining the circuit breaker chamber and extends through the first through-hole, wherein the other end of the fixing member passing through the first through-hole is inserted into one end of the connection member, wherein the other end of the connection member passes through a second through-hole formed at one end of each of the pair of support members, wherein the other end of the connection member passing through the second through-hole is coupled to the nut, wherein the washer is interposed between the nut and the other end of the connection member.

In one implementation, the actuator includes: a pair of pivoting members disposed at a path along which the circuit breaker is inserted into the chamber, wherein as the circuit breaker is inserted into the chamber, each of the pair of pivoting members comes into contact with a shutter roller guide installed on each of both opposing sides of the circuit breaker and thus pivots upwardly around a second pivot center; and a pair of link members for hinge-connecting distal ends of the pair of pivoting members to middle portions of the pair of support members, respectively.

In one implementation, a path along which the shutter pivots extends between a position at which the shutter closes the open hole and a top position of the circuit breaker chamber.

In one implementation, when the open hole is opened, the shutter plate moves to a service position and is positioned above the circuit breaker inserted into the chamber, such that a predefined insulating distance between the shutter plate and the conductor of the bushing assembly exposed through the open hole as opened is secured.

In one implementation, each of the pair of support members includes multiple telescopic pipes connected in series to each other, wherein an elastic spring is interposed between adjacent ones of the multiple telescopic pipes, wherein rollers are installed on an inner face of a top wall of the switchboard body, wherein an installation position of the rollers is located above a main circuit such that a spacing between the installation position and the first pivot center is smaller than a pivot radius of the shutter plate around the first pivot center, wherein the shutter plate pivots so as to be positioned above the circuit breaker and at the same time, a top face of the shutter plate is pressed downwardly by the rollers, such that a length of each of the pair of support members is elastically reduced.

In one implementation, an inclined face is formed on each of both opposing tip ends of the shutter plate, wherein the inclined face guides contact of the shutter plate with the rollers.

In one implementation, the switchboard further comprises: an auxiliary shutter plate disposed on the rear face of the switchboard body, wherein the auxiliary shutter plate moves up or down along a guide shaft so as to open and close an auxiliary open hole formed under the open hole and in the rear face of the body; a pair of auxiliary pivoting members, each having one end connected to a pivot shaft of each of the pair of pivoting members so as to pivot; and a pair of auxiliary link members, each having a lower end hinge-connected to the other end of each of the pair of auxiliary pivoting members, wherein upper ends of the pair of auxiliary link members are respectively hinge-connected to both opposing ends of the auxiliary shutter plate, wherein when the pair of auxiliary pivoting members pivot downwardly, the pair of auxiliary link members move downward such that the auxiliary shutter plate moves downward to open the auxiliary open hole.

In the switchboard with the pivotable shutter structure according to the present disclosure, the shutter that opens and closes the inlet of the bushing assembly has an opening and closing mechanism operating in a pivotable scheme to reduce a vertical dimension by which the shutter moves vertically to a value smaller than a predefined value when opening the inlet, thereby reducing a size of the switchboard.

Further, in the switchboard with the pivotable shutter structure according to the present disclosure, the shutter that opens and closes the inlet of the bushing assembly has an opening and closing mechanism operating in a pivotable scheme and pivots along an inner side of the switchboard when opening the inlet, thereby securing a predefined insulating distance to the bushing assembly.

The above-described effects, and specific effects of the present disclosure as not mentioned above will be described based on specific details for carrying out the disclosure.

DETAILED DESCRIPTION

The above objects, features and advantages will be described in detail later with reference to the accompanying drawings. Accordingly, a person with ordinary knowledge in the technical field to which the present disclosure belongs will be able to easily implement the technical idea of the present disclosure. In describing the present disclosure, when it is determined that a detailed description of an identified component related to the present disclosure may unnecessarily obscure the gist of the present disclosure, the detailed description is omitted. Hereinafter, a preferred embodiment according to the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar elements.

In addition, it will also be understood that when a first element or layer is referred to as being present “on” or “beneath” a second element or layer, the first element may be disposed directly on or beneath the second element or may be disposed indirectly on or beneath the second element with a third element or layer being disposed between the first and second elements or layers.

FIG.7Ais a perspective view showing a switchboard before a circuit breaker is inserted into a circuit breaker chamber.FIG.7Bis an exploded perspective view showing a first hinge structure ofFIG.7A.FIG.8is a diagram showing a pivotable shutter structure according to the present disclosure.FIG.9is a perspective view showing a circuit breaker positioned in a test position in a circuit breaker chamber.

Referring toFIG.7AandFIG.7B, the switchboard in accordance with the present disclosure includes a switchboard body100, a shutter200, and an actuator300.

A circuit breaker chamber101is defined inside the switchboard body100. The circuit breaker chamber101refers to a space into which the circuit breaker10is inserted.

An open hole110having a predefined hole area is formed in a rear face of the switchboard body100. A bushing assembly20is disposed on the rear face of the switchboard body100in which the open hole110is formed.

The bushing assemblies20and30are respectively composed of the insulating material housings21and31and the electrical conductors22and32as described with reference toFIG.2above. The electrical conductors22and32of the bushing assemblies20and30are positioned to be exposed to an inner space of the switchboard body100through the open hole110.

Further, the main circuit11of the circuit breaker has the electrical conductor12of the circuit breaker connected to the electrical conductors22and32of the bushing assemblies20and30. Accordingly, when the circuit breaker10is inserted into the circuit breaker chamber101of the switchboard body100and has moved to a set service position, each of the electrical conductors12of the circuit breaker is electrically connected to each of the electrical conductors22and23of the bushing assemblies20and30exposed through the open hole110.

Referring toFIG.8, the shutter200according to the present disclosure is placed in an interior space of the switchboard body100.

The shutter200has a shutter plate210and a pair of support members220.

The shutter plate210is formed in a plate shape. The shutter plate210has an area size equal to or greater than that of the open hole110.

The pair of support members220has the same shape. Each support member220is embodied as a plate-shaped member having a predefined length.

One end of each of the pair of support members220is coupled to each of both opposing ends of the shutter plate210. One end of each of the pair of support members220may be integrally formed with each of both opposing ends of the shutter plate210. Each of the pair of support members220is bent to form a predetermined angle with respect to the shutter plate210. Each member220may be bent at a right angle, or at angle other than the right angle.

A distal end of each of the pair of support members220is hinge (h1)-connected to each of both opposing sides of the switchboard body100such that the hinge h1acts as a first pivot center of the shutter plate210as shown inFIG.7A.

Accordingly, the shutter plate210pivots based on a first pivot center. A pivot angle range of the shutter plate210may in a range of 0 degrees to a right angle. The pivot angle range of the shutter plate210may be in a range of 0 degrees at which the shutter plate210covers the open hole110to a right angle by which the plate210pivots upwardly.

Referring toFIG.7B, the first pivot center corresponds to a first hinge.

Distal ends of the pair of support members220are pivotally respectively connected to both opposing sides of the switchboard body100via fastening means. Thus, the first hinges h1may be formed.

The fastening means may include a following configuration.

A first through-hole100ais formed on each of both opposing side walls of the circuit breaker chamber101. A fixing member100bpasses from an outer wall face of the circuit breaker chamber101into the first through-hole100a. One end of the fixing member100ais fitted into one end of a connection member100cand on an inner face of a wall defining the circuit breaker chamber101.

The other end of the connection member100cpasses through a second through-hole220aformed in one end of each support member220.

The other end of the connection member220passing through the second through-hole220ais coupled with a nut N. A washer W is interposed between the nut N and the other end of the connection member100c.

In this way, the first hinge h1may be formed between one end of each support member220and each of both opposing side walls defining the circuit breaker chamber101. Referring toFIG.8, the actuator300according to the present disclosure serves to drive a pivoting motion of the shutter200as the circuit breaker10is inserted into the circuit breaker chamber101.

The actuator300includes a pair of fixed plates310, a pair of pivoting members320, and a pair of link members330.

The pair of fixed plates310are respectively fixed to the inner faces of both opposing side walls of the switchboard body100. The pair of fixed plates310are exposed to an inner space of the circuit breaker chamber101. A pivot shaft311is formed at each of the pair of fixed plates310.

Each of the pair of pivoting members320has a length. Each of the pair of pivoting members320is composed of a first member321having a first length and a second member322having a second length and bent at an end of the first member321. The second length is larger than the first length. Accordingly, each of the pair of pivoting members320is formed in an ‘ L’ shape. A shutter roller323is installed between the first and second members321and322. The shutter roller323pivots the pivoting member320counterclockwise while being in contact with the shutter roller guide13formed on each of both opposing sides of the circuit breaker10inserted into the circuit breaker chamber101.

Each of the pair of pivoting members320is disposed below the pivot shaft311of each fixed plate310. An end of the first member321of each of the pair of pivoting members320is pivotally connected to the pivot shaft311.

Moreover, a torsion spring312is installed around the pivot shaft311so that after each pivoting member320pivots, each member320is returned to its original position under an elastic force of the spring312.

In one example, a lower end of each of the pair of link members330is hinge (h2)-connected to the other end of each of the pair of pivoting members320. That is, the lower end of each of the pair of link members330is hinge (h2)-connected to an end of the second member322of each of the pair of pivoting members320.

Moreover, an upper end of each of the pair of link members330is hinge (h3)-connected to a middle portion of the pair of support members220.

Accordingly, the pair of link members330respectively links the pair of pivoting members320and the pair of support members220to each other so as to transmit a pivoting force from the pivoting members320to the pair of support members220.

Each of the pair of link members330has a length larger than that of each of the support member220and the pivoting member320by a predetermined value.

In this regard, a pivot path of the shutter plate210extends between a position for closing the open hole110and a top position of the circuit breaker chamber101.

Further, when the open hole110is opened, the shutter plate210is positioned above the circuit breaker10which has moved to the service position and is inserted into the room. Thus, an insulating distance set in a predefined position inside the circuit breaker chamber101so as not to be limited to the vertical direction may be formed between the shutter plate210and the bushing conductor22of the bushing assembly20exposed through the open hole110as opened.

In one example, in accordance with the present disclosure, an auxiliary open hole120is formed under the open hole110and in the rear face of the switchboard body100. The auxiliary open hole120may have the same shape as that of the open hole110.

An auxiliary shutter plate410for opening and closing the auxiliary open hole120is disposed on the rear face of the switchboard body100.

A pair of guide shafts420having a predefined vertical length are respectively installed at both opposing sides of the auxiliary shutter plate410, and on the rear face of the switchboard body100.

The pair of guide shafts420respectively pass through both opposing ends of the auxiliary shutter plate410.

Accordingly, the auxiliary shutter plate410moves vertically along the pair of guide shafts420.

Moreover, a pair of auxiliary pivoting members430are disposed at upper portions of the pivot shafts311of the pair of fixed plates310as described above. The auxiliary pivoting member430is formed in the same shape as that of the above-described pivoting member320.

One end of each of the pair of auxiliary pivoting members430is pivotally connected to the pivot shaft311and pivots vertically.

In this regard, the pair of auxiliary pivoting members430are respectively disposed above the pair of the above-mentioned pivoting members320. The pair of auxiliary pivoting members430are positioned vertically symmetrically with respect to the pair of the above-mentioned pivoting members320, respectively.

A shutter roller431of a structure similar to that of the shutter roller323as described above is installed at each of the pair of auxiliary pivoting members430. The shutter roller431pivots the auxiliary pivoting member430while being in contact with the shutter roller guide (13inFIG.6) formed on each of both opposing sides of the circuit breaker10inserted into the circuit breaker chamber101.

The other end of each of the pair of auxiliary pivoting members430is hinge (h4)-connected to a lower end of each of the pair of auxiliary link members440. An upper end of each of the pair of auxiliary link members440is hinge (h5)-connected to each of both opposing ends of the auxiliary shutter plate410.

Accordingly, when the pair of auxiliary pivoting members430pivot downwards, the pair of auxiliary link members440move downward, and thus the auxiliary shutter plate410moves downward to open the auxiliary open hole120.

FIG.9is a perspective view showing a circuit breaker positioned in a test position in a circuit breaker chamber.FIG.10is a perspective view showing a state in which a circuit breaker is inserted into a circuit breaker chamber.FIG.11is a perspective view showing a state in which a circuit breaker is inserted into a service position.FIG.12is a side view showing a difference between a vertical dimension of the switchboard according to the present disclosure and a vertical dimension of the conventional switchboard.

Referring toFIG.9toFIG.11, a process in which the shutter200operates under an operation of the actuator300as the circuit breaker10is inserted into circuit breaker chamber101is described.

As shown inFIG.9, the shutter plate210covers and closes the open hole110while the circuit breaker10is positioned at the test position in the circuit breaker chamber101. The shutter plate210is in an initial state before pivoting upwardly. At this time, the bushing assembly20is positioned in rear of the open hole110, and the conductor22of the bushing assembly20is positioned near the open hole110.

At the same time, the auxiliary shutter plate410covers and closes the auxiliary open hole120. The auxiliary shutter plate410is in an initial state before moving downward. In this regard, the auxiliary bushing assembly30is positioned in rear of the auxiliary open hole120, and the auxiliary conductor32of the auxiliary bushing assembly30is positioned near the auxiliary open hole120.

At this time, a vertical spacing between each of the pair of pivoting members320and each of the pair of auxiliary pivoting members430is in an increased state.

In this state, as shown inFIG.10, the circuit breaker10may move to the service position within circuit breaker chamber101.

At this time, the respective shutter roller guides13installed on respective both opposing sides of the circuit breaker10may contact and push the shutter rollers323and431of the pivoting member320and the auxiliary pivoting member430, respectively.

Then, the pair of pivoting members320and the pair of auxiliary pivoting members430may pivot such that the vertical spacing between each of the pair of pivoting members320and each of the pair of auxiliary pivoting members430is reduced. That is, each of the pair of pivoting members320pivots in the upward or counterclockwise direction, while each of the pair of auxiliary pivoting members430pivots downwardly or in the clockwise direction.

Then, each of the pair of link members330hinge-connected to the other end of each of the pair of pivoting members320begins to move upward. At the same time, the pair of support members220hinge (h3)-connected to the tops of the pair of link members330start to pivot in the counterclockwise direction around the hinge h1as the first pivot center.

Accordingly, the shutter plate210having both opposing ends respectively hinge-connected to the other ends of the pair of support members220pivots upwardly and along the counterclockwise direction around the first pivot center to gradually open the open hole110.

At the same time, the pair of auxiliary link members440respectively hinge-connected to the other ends of the pair of auxiliary pivoting members430pivoting downwardly and along the clockwise direction start to move downward. At the same time, the auxiliary shutter plate410having both opposing ends respectively hinge-connected to the tops of the pair of auxiliary link members440may gradually move down.

Accordingly, the auxiliary shutter plate410begins to gradually open the auxiliary open hole120while the plate410is gradually descending.

Referring toFIG.11, when the circuit breaker10moves to the service position in the circuit breaker chamber101, the shutter plate210pivots so as to be positioned on top of the main circuit11to open the open hole110and, at the same time, the auxiliary shutter plate410moves down to open an entirety of the auxiliary open hole120.

Accordingly, the electrical conductors12of the circuit breaker of the main circuits11which have moved to the service position may be electrically connected to the electrical conductors22of the bushing assembly20and the electrical conductors32of the auxiliary bushing assembly30, respectively.

Referring toFIG.12, in accordance with the present disclosure, the open hole110positioned above the auxiliary open hole120is opened while the shutter plate210pivots upwardly.

In a state in which the open hole110is fully opened, the shutter plate210pivots upwardly from the open hole110in a counterclockwise direction and then is positioned the main circuits11and extends horizontally.

Accordingly, a vertical dimension of the switchboard body100may be reduced by a predefined vertical dimension value, compared to the conventional switchboard body100in the prior art in which the shutter plate opens and closes the open hole110while the shutter plate moves up and down. That is, the vertical dimension of the switchboard body100according to the present disclosure may be reduced by a predefined vertical dimension H, compared to the vertical dimension of the conventional switchboard1. Thus, the switchboard may be easily miniaturized.

FIG.13is a diagram showing an example of a structure that guides a shutter plate according to the present disclosure to be positioned at a level which is lowered by a predefined value while pivoting so as to be positioned above a main circuit.

Referring toFIG.13, each of the pair of support members220according to the present disclosure may include bar members221constituting multi-stages and connected to each other while an elastic spring222is interposed therebetween.

Rollers130are installed on an inner face of each of bottom opposing side walls of the switchboard body100.

The rollers130are located above the main circuit11. A distance between the first pivot center and the rollers130may be smaller than a pivoting radius of the shutter plate210around the first pivot center.

As the shutter plate210pivots so as to be positioned above the circuit breaker10, a top face of the shutter plate210comes into contact with the rollers130in a rolling manner and moves along the rollers and is pressed downwardly such that a length of each of the pair of support members220may be elastically reduced.

According to the above configuration, when the shutter plate210pivots to be positioned on top of the main circuit11, a vertical position of the shutter plate is lowered compared to a case in which the support member220is not configured in the manner as shown inFIG.13. Thus, the vertical dimension of the switchboard body100may be reduced more efficiently.

FIG.14is a diagram showing an example in which an inclined face is formed at a tip portion of the shutter plate ofFIG.13.

Referring toFIG.14, an inclined face211guiding contact of the shutter plate with the rollers130is formed at each of both opposing ends of the shutter plate210.

The inclined face211serves to guide the shutter plate210so that the shutter plate pivots in the counterclockwise direction from an initial position while a top face thereof is easily pressed by the rollers130.

In the switchboard with the pivotable shutter structure according to the present disclosure, the shutter that opens and closes the inlet of the bushing assembly has an opening and closing mechanism operating in a pivotable scheme to reduce a vertical dimension by which the shutter moves vertically to a value smaller than a predefined value when opening the inlet, thereby reducing a size of the switchboard.

Further, in the switchboard with the pivotable shutter structure according to the present disclosure, the shutter that opens and closes the inlet of the bushing assembly has an opening and closing mechanism operating in a pivotable scheme and pivots along an inner side of the switchboard when opening the inlet, thereby securing a predefined insulating distance to the bushing assembly.

The present disclosure as described above may be subjected to various substitutions, modifications and changes within the scope that does not depart from the technical spirit of the present disclosure by those of ordinary skill in the technical field to which the present disclosure belongs. Thus, the present disclosure is not limited to the above-described embodiments and the attached drawings.