JPH11164424A - Distribution panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power distribution panel which is capable of assuring high safety for testing of fixed terminals in a main circuit. SOLUTION: In a distribution panel equipped with a shutter device between fixed terminals 2 of a main circuit which is provided in a distribution panel frame and a main circuit plug 31 provided in an electrical equipment unit 3, a shutter lock mechanism 5 is provided which is capable of giving an open maintenance state to a shutter device 4, when the shutter 41 is artificially set to an open state and is capable of canceling the open maintenance state of the shutter device, when the electrical equipment unit 3 has been installed to the distribution panel frame 1. Thus, the open state between the fixed terminal 2 of the main circuit and the main circuit plug 31 can be surely maintained by artificially pushing down the shutter 41, after the shutter 41 has been set to a shielded state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard equipped with a drawable electrical equipment unit, and more particularly to a shutter device for shielding a main circuit terminal on the board when the electrical equipment unit is pulled out of the switchboard.

[0002]

2. Description of the Related Art Conventionally, a switchboard equipped with a drawable electrical device unit is configured as shown in FIG. 12, for example. In the figure, reference numeral 1 denotes a switchboard frame formed in an L shape, a bottom plate 11, a front plate 12 standing perpendicular to the bottom plate 11, and two side plates 13 connecting the bottom plate 11 and the front plate 12 on both sides. Consists of Reference numeral 2 denotes a main circuit fixing terminal, which is vertically attached to the front plate 12 via a cylindrical insulator 21. Reference numeral 3 denotes an electric equipment unit having a circuit breaker or the like mounted thereon, and 31 denotes a main circuit plug which can come into contact with the main circuit fixing terminal 2.
Extending towards. Reference numeral 32 denotes a trolley on which the electric device unit 3 is mounted so that the entire electric device unit 3 can be moved in the direction in which the main circuit plug 31 extends. 4
Denotes a shutter device, 41 denotes a plate-shaped shutter for shielding between the main circuit fixing terminal 2 and the main circuit plug 31, and an insulator 21.
The opening 22 is covered. 42 is a shutter 4
1 is a guide bar which is provided below and has a vertically long groove. Reference numeral 43 denotes a tension spring acting to always pull the shutter 41 upward. A guide rail 44 guides the shutter 41 up and down. A shutter lever 45 has one end rotatably supported by a support pin 46 provided on the side plate 13, and the other end inserted into a groove of the guide bar 42. Shutter lever 45
A cam 49 including a slope portion 47 and a flat portion 48 is formed on the upper surface of the cam. Reference numeral 33 denotes a cam roller provided on the carriage 32, which is disposed so as to engage with a cam 49 provided above the shutter lever 45.

Here, the operation of the shutter device 4 will be described. When the switchboard is put into the operating state, the electric equipment unit 3 is moved together with the carriage 32 as shown in FIG.
The main circuit plug 31 is advanced toward the main circuit fixing terminal 2. At this time, the cam roller 33 provided on the carriage 32 engages with the cam 49 to rotate the shutter lever 45 around the support pin 46, and the guide bar provided below the shutter 41.
The shutter 41 is pulled down by engaging with the lower portion of the shutter 42. As a result, the shutter 41 is lowered below the main circuit plug 31, and the main circuit plug 31 can be brought into contact with the main circuit fixing terminal 2. By further moving the carriage 32, the main circuit plug 31 and the main circuit fixing terminal 2 come into contact,
It becomes an operation state. Next, when the main circuit plug 31 is separated from the main circuit fixing terminal 2 so that the electric device unit 3 can be tested, as shown in FIG. 31 is moved in a direction away from the main circuit fixing terminal 2 and placed at the test position. At this time, the cam roller 33 separates from the cam 49,
Since the shutter lever 45 is freely rotatable, the shutter 41 is lifted upward by the tension spring 43 so as to close the opening 22 of the insulator 21 between the main circuit fixing terminal 2 and the main circuit plug 31. Go to As described above, the shutter device 4 is in a state where the main circuit plug 31 is separated from the main circuit fixing terminal 2 so that the test of the electric device unit 3 is possible (test position), or the electric device unit 3 and the main circuit plug 31 are located outside the switchboard. In this state, the shutter 41 shields the main circuit plug 31 from the main circuit fixed terminal 2.

[0004]

However, in the above-mentioned prior art, when the electric equipment unit 3 is tested, the electric equipment unit 3 is moved to a test position where the main circuit fixing terminal 2 and the main circuit plug 31 are separated from each other. In this case, there is no problem even if the shutter 41 is in the shielding state.
However, when the electrical equipment unit 3 is removed from the panel and a test is performed on the main circuit fixed terminal 2 side, for example, when a test lead is connected to the main circuit fixed terminal 2 to perform an insulation resistance test or a withstand voltage test, a shutter is required. Since there was no function to maintain the open state in which the shutter 41 was pushed down, the main circuit fixing terminal 2 was kept exposed by a method such as hanging a weight on the shutter 41. Therefore, there is a problem that the open state of the shutter 41 is unstable and a safe test operation cannot be performed. According to the present invention, when the shutter is artificially depressed, the open state is automatically maintained, and the open maintenance state is automatically canceled by loading the electric device unit into the operation state, thereby testing the main circuit fixed terminal. It is an object of the present invention to provide a switchboard that can be extremely safe.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a main circuit fixing terminal vertically mounted on a switchboard frame via an insulator, and an electric device housed in the switchboard frame. A unit, a main circuit plug extending from the electric device unit toward the main circuit fixing terminal, and a carriage carrying the electric device unit, and shielding between the main circuit fixing terminal and the main circuit plug. Shutter, a guide bar provided below the shutter, a tension spring acting to always lift the shutter upward, and one end rotatably provided by a support pin provided on a side plate of the switchboard frame. The other end is supported by a shutter lever inserted into the guide bar, a cam formed on an upper surface of the shutter lever, In a switchboard provided with a shutter device comprising a cam provided on a vehicle and a cam roller capable of engaging with the cam, when the shutter is artificially opened, the shutter device is kept open and the electrical device unit A shutter lock mechanism configured to cancel the open state of the shutter device when the shutter device is mounted on the switchboard frame. Also,
The shutter lock mechanism is an L-shaped lock lever rotatably attached to the side plate below the shutter lever by an engagement roller provided at a central portion of the shutter lever and a support pin provided at the central portion. A hook formed so that the engaging roller can be engaged with a tip of a hook formed by one leg of the lock lever; a stopper formed by the other leg of the lock lever; A torsion spring acting so as to always press in a direction in which the portion contacts the bottom plate of the switchboard frame, an engaging pin provided at an intermediate portion of the hook portion, and a horizontal extending below the cam roller and provided on the bogie. A push plate, and when the carriage moves to a position where the main circuit fixing terminal and the main circuit plug come into contact with each other, the push plate moves the lock lever The is tilted, in which the engaging roller is so disengaged from the hook portion. Further, the shutter lock mechanism is rotatably supported by an engagement roller provided at a center portion of the shutter lever and a support pin provided on the side plate, and includes first and second extending sides of the support pin.
An arm and a second arm, the seesaw lever adapted to allow the first arm to engage with the engagement roller; a torsion spring acting to keep the seesaw lever always horizontal; A lock lever having a tip roller rotatably supported by a support pin provided on the side plate and engaging with the second arm provided at the tip, and an engagement pin provided at an intermediate portion; A torsion spring acting to return to the position, and a push plate provided on the carriage and capable of engaging with the engagement pin, wherein the carriage is located at a position where the main circuit fixing terminal and the main circuit plug come into contact with each other. When moving forward, the push plate tilts the lock lever via the engagement pin so that the engagement roller is disengaged from the seesaw lever. Therefore, after the shutter is closed, the shutter is artificially pushed down, so that the open state between the main circuit fixing terminal and the main circuit plug is reliably maintained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a side sectional view showing a first embodiment of the present invention, FIG. 1B is an enlarged view of a main part, and FIG. 2 is a plan sectional view taken along the line AA. In the figure, 1 is a switchboard frame formed in an L-shape, 11 is a bottom plate, 12 is a front plate standing perpendicular to the bottom plate 11, and 13 is a side plate connecting the bottom plate 11 and the front plate 12 on the side. 2 is a main circuit fixing terminal, 21 is a cylindrical insulator, 22 is an opening, 3 is an electric equipment unit equipped with a circuit breaker and the like, 31 is a main circuit plug that can contact the main circuit fixing terminal 2, and 32 is an electric It is a trolley on which the device unit 3 is mounted. 4 is a shutter device, 41 is a plate-shaped shutter for shielding between the main circuit fixing terminal 2 and the main circuit plug 31, 42 is a guide bar, and 43 is a shutter 41.
Tension spring, which always acts to pull up
A guide rail 44 guides the shutter 41 up and down.
Reference numeral 5 denotes a shutter lever, one end of which is rotatably supported by a support pin 46 provided on the side plate 13, and the other end of which is inserted into a guide bar 42. 47 is a slope portion of the upper surface of the shutter lever 45, 48 is a flat portion, 49 is a cam,
Reference numeral 33 denotes a cam roller provided on the carriage 32, which is arranged to engage with the cam 49.

The above configuration is substantially the same as that of the conventional example, and is different from the conventional example in that the shutter device 4 is additionally provided with a shutter lock mechanism described below. 5 is a shutter lock mechanism for maintaining the shutter 41 in an open state;
Reference numeral 51 denotes an engagement roller provided at the center of the shutter lever 45, 6 denotes an L-shaped lock lever, and a side plate 13 below the shutter lever 45 is supported by a support pin 61 provided at the center.
Is mounted to be rotatable. Reference numeral 62 denotes a hook portion formed of one leg of the lock lever 6, and a shutter lever 4
5 is provided with a key portion 63 at the tip end of which the engaging roller 51 can engage. Reference numeral 64 denotes a stopper formed by the other leg of the lock lever 6, which stops rotation of the lock lever 6 in one direction. Reference numeral 65 denotes a torsion spring that acts to always press the lock lever 6 in the direction in which the stopper 64 contacts the bottom plate 11 (counterclockwise in the figure). Reference numeral 66 denotes an engagement pin provided at an intermediate portion of the hook portion 62. Reference numeral 7 denotes a push plate extending horizontally below the cam roller 33 provided on the carriage 32. When the carriage 32 advances to the operating state shown in FIG. 1, the engaging pin 66 is pressed, the lock lever 6 is depressed, and the shutter lever 45 is depressed. Engaging roller 51 provided on
Is detached from the hook portion 63 of the hook portion 62.

Here, the operation of the first embodiment will be described.
In the operating state, as shown in FIG. 1, the carriage 32 moves to the main circuit fixed terminal 2 side, the cam roller 33 is engaged with the cam 49, and the shutter lever 45 rotates around the support pin 46 while turning clockwise. The guide bar 42 is tilted down and pushes the guide bar 42 downward. Therefore, the shutter 41 is lowered below the main circuit plug 31, and the main circuit plug 31 can be brought into contact with the main circuit fixed terminal 2, so that the main circuit plug 31 and the main circuit fixed terminal 2 come into contact. Next, when the electric equipment unit 3 is moved to the test position, as shown in FIG. 3, the carriage 32 is moved together with the electric equipment unit 3 and the main circuit plug 31 in a direction away from the main circuit fixing terminal 2. At this time, the cam roller 33 is separated from the cam 49, and the shutter lever 45 becomes freely rotatable.
The main circuit fixing terminal 2 is pulled up by a tension spring 43 so as to close the opening 22 of the insulator 21.
And between the main circuit plug 31 and a shielding state.

Next, when the electric equipment unit 3 is removed from the panel, the shutter 41 remains in a state of covering the opening 22 of the insulator 21 as shown in FIG. In this state, when the shutter 41 or the shutter lever 45 is pushed down artificially against the force of the tension spring 43, the shutter lever 45 pivots around the support pin 46 as shown in FIG. Since the guide bar 42 into which the shutter lever 45 is inserted is lowered, the engaging roller 51 provided on the shutter lever 45 is engaged with the key portion 63 of the lock lever 6, and the shutter lever 45 maintains the state of being lowered downward. Then, the shutter lock mechanism 5 is in a so-called open maintaining state. As a result, the shutter lever 45 is moved to the guide bar 42.
Is pushed down, the shutter 41 is pushed down below the opening 22 of the insulator 21, the opening 22 is opened, and this open state is maintained. As described above, even when the electric device unit 3 is removed from the panel, the open state of the opening 22 is reliably maintained by artificially pressing down the shutter 41, so that the test lead is connected to the main circuit fixing terminal 2. By connecting, an insulation resistance test and a withstand voltage test can be performed in a safe state.

Next, the shutter lock mechanism 5 is kept open and the shutter 41 held in the open state is moved from the test position to the operating state by moving the electric device unit 3 to the shutter lock mechanism 5. The operation of automatically canceling the open state will be described. When mounting the electric equipment unit 3 on the switchboard frame 1 and returning to the operation state, the carriage 32 is moved to the main circuit fixing terminal 2 side as shown in FIG. At this time, the cam roller 33 is engaged with the cam 49, and the shutter lever 45 remains in the down state. At the same time, the push plate 7 provided on the carriage 32 is engaged with the engaging pin provided on the hook portion 62 of the lock lever 6. 66, the lock lever 6 falls down, and the engaging roller 51 provided on the shutter lever 45
Deviate from 3. Therefore, since the engagement roller 51 becomes free, the open maintenance state in which the shutter 41 is artificially opened by the shutter lock mechanism 5 is automatically canceled, and the shutter lever 45 is moved to the cam roller 3.
A state of being pressed downward only by 3 is formed. As a result, the shutter 41 is automatically set to the main circuit plug 3
The main circuit plug 31 contacts the main circuit fixing terminal 2 while maintaining the open state lowered below 1, and an operation state is established.

FIG. 6 is a side sectional view showing a second embodiment of the present invention. In the second embodiment, a shutter lock mechanism 50 described below is provided in place of the shutter lock mechanism 5 described in the first embodiment. That is, reference numeral 8 denotes a seesaw lever rotatably supported by a support pin 81 provided on the side plate 13. A first arm 82 and a second arm 83 extending on both sides of the support pin 81 are provided. Arm 82 can be engaged with the engagement roller 51 provided on the shutter lever 45. 84 is a torsion spring so that the seesaw lever 8 always keeps horizontal. Reference numeral 9 denotes a lock lever, which is a support pin 9 provided on the side plate 13.
1 and has a tip roller 92 at the tip that engages with the second arm 83, and an engagement pin 93 provided at an intermediate portion between the support pin 91 and the tip roller 92, and the engagement pin 93 is a bogie. It is provided at a position where it can engage with the push plate 7 provided at 32. A torsion spring 94 acts to always return the lock lever 9 to the vertical position.

Here, the operation of the second embodiment will be described.
In a state where the electric device unit 3 is moved from the operation state shown in FIG. 6 to the test position or outside the panel, as shown in FIG.
Since no external force is applied to the shutter lever 45, the shutter 41 is pulled up by the tension spring 43,
The main circuit fixing terminal 2 is shielded. Next, when the shutter 41 or the shutter lever 45 is pushed down artificially against the force of the tension spring 43, as shown in FIG. Since the first arm 82 is pushed down,
The seesaw lever 8 rotates counterclockwise, and as shown in FIG. 9, the engagement roller 51 goes under the first arm 82. Therefore, the seesaw lever 8 is returned to the horizontal position by the torsion spring 84, and the shutter lever 45 together with the engaging roller 51 receives a force to be pulled up above the tension spring 43, but the other second arm 83 of the seesaw lever 8 is Since the shutter lever 45 is engaged with the leading end roller 92 of the lock lever 9, the movement of the shutter lever 45 is locked, and the shutter is maintained in the open state. Therefore, the shutter 41 which has been artificially pushed down is held with the main circuit fixing terminal 2 exposed by engagement of the seesaw lever 8 and the lock lever 9.

Next, the shutter lock mechanism 50 is kept open and the shutter 41 held open is moved from the test position to the operation state of the electric device unit 3 to thereby operate the shutter lock mechanism 50. The operation of automatically canceling the open state will be described. When the electric equipment unit 3 is mounted on the switchboard frame 1 and returns to the operation state, the carriage 32 is moved to the main circuit fixing terminal 2 side as shown in FIG. At this time, the push plate 7 provided on the carriage 32 is engaged with the engaging pin 93 provided on the lock lever 9.
, The lock lever 9 is tilted down, the second arm 83 of the seesaw lever 8 is disengaged from the tip roller 92 of the lock lever 9, and the seesaw lever 8 is rotated clockwise. The engagement between the first arm 82 and the engagement roller 51 provided on the shutter lever 45 is released. Therefore, as shown in FIG.
Is released, the shutter-opening state in which the shutter 41 is artificially opened by the shutter lock mechanism 50 is automatically canceled. The shutter lever 45 is once raised and the shutter 41 is closed, but when the electric device unit 3 is further moved to the main circuit fixed terminal 2 side together with the carriage 32, the shutter lever 45 is moved by the cam roller 33 as shown in FIG. Only a state where it is pressed downward is formed. As a result, the shutter 41 automatically maintains the open state lowered below the main circuit plug 31, the main circuit plug 31 comes into contact with the main circuit fixing terminal 2, and an operation state is established.

[0014]

As described above, according to the present invention, when the shutter device is provided with the shutter lock mechanism, and the shutter provided between the main circuit fixing terminal and the main circuit plug is in the shielded state, it is difficult to achieve By keeping the shutter open, the open state is maintained, and by mounting the electric device unit in the operating state, the operation of automatically maintaining the open state is canceled, so that the safe open state of the shutter can be maintained. The operation panel can be returned to the operation state by a simple operation, and there is an effect that it is possible to provide a switchboard in which the test of the main circuit fixed terminal can be performed extremely safely.

[Brief description of the drawings]

FIG. 1A is a side sectional view showing a first embodiment of the present invention, and FIG.

FIG. 2 is a plan sectional view showing the first embodiment of the present invention.

FIG. 3 is a side sectional view showing a shutter in a closed state according to the first embodiment of the present invention.

FIG. 4 is a side sectional view showing a shutter blocking state when the electric device unit according to the first embodiment of the present invention is removed.

FIG. 5 is a side sectional view when the electric device unit according to the first embodiment of the present invention is removed, the shutter is artificially opened, and the shutter lock mechanism is kept open.

FIG. 6 is a side sectional view showing a second embodiment of the present invention.

FIG. 7 is a side sectional view showing a shutter in a shielded state according to a second embodiment of the present invention.

FIG. 8 is a side sectional view of the second embodiment of the present invention in which a shutter is artificially opened.

FIG. 9 is a side sectional view when a shutter according to a second embodiment of the present invention is artificially opened and a shutter lock mechanism is kept in an open maintaining state.

FIG. 10 is a side cross-sectional view in the middle of canceling a shutter lock mechanism from an open maintenance state according to a second embodiment of the present invention.

FIG. 11 is a side cross-sectional view when the shutter lock mechanism according to the second embodiment of the present invention has been canceled from the open maintenance state.

FIG. 12 is a side sectional view showing a conventional example.

FIG. 13 is a side cross-sectional view showing a shielded state of a conventional shutter.

[Explanation of symbols]

1: switchboard frame, 11: bottom plate, 12: front plate, 1
3: side plate, 2: main circuit fixed terminal, 21: insulator, 22:
Opening 3: 3: Electrical equipment unit: 31: Main circuit plug
32: trolley, 33: cam roller, 4: shutter device, 4
1: shutter, 42: guide bar, 43: tension spring, 44: guide rail, 45: shutter lever, 4
6: support pin, 47: slope portion, 48: flat portion, 49: cam, 5, 50: shutter lock mechanism, 51: engagement roller, 6: lock lever, 61: support pin, 62: hook portion, 63: Key portion, 64: stopper portion, 65: torsion spring, 66: engagement pin, 7: push plate, 8: seesaw lever, 81: support pin, 82: first arm, 83: second
Arm, 84: torsion spring, 9: lock lever, 91:
Support pin, 92: tip roller, 93: engagement pin, 94:
Torsion spring

Claims (3)

[Claims] 1. A main circuit fixing terminal vertically attached to a switchboard frame via an insulator, an electric device unit housed in the switchboard frame, and a direction from the electric device unit to the main circuit fixing terminal. A shutter that includes a main circuit plug that extends and extends, and a carriage on which the electric device unit is mounted, and that shields between the main circuit fixing terminal and the main circuit plug, and a guide bar that is provided below the shutter. A tension spring acting to always pull the shutter upward, and one end rotatably supported by a support pin provided on a side plate of the switchboard frame, and the other end inserted into the guide bar. A shutter lever, a cam formed on an upper surface of the shutter lever, and a cam roller provided on the carriage and capable of engaging with the cam. When the shutter is artificially opened, the shutter device is kept open, and when the electric device unit is mounted on the switchboard frame, A power distribution panel comprising a shutter lock mechanism configured to cancel an open maintenance state. 2. The shutter lock mechanism according to claim 1, wherein the shutter lock mechanism is rotatably attached to the side plate below the shutter lever by an engagement roller provided at a center of the shutter lever and a support pin provided at the center. L-shaped lock lever, a hook formed so that the engaging roller can be engaged with the tip of a hook formed by one leg of the lock lever, and a stopper formed by the other leg of the lock lever A torsion spring acting so as to constantly press the stopper portion in the direction in which the stopper portion contacts the bottom plate of the switchboard frame, an engagement pin provided at an intermediate portion of the hook portion, and a horizontal extension below the cam roller, A push plate provided on the cart, wherein when the cart advances to a position where the main circuit fixing terminal and the main circuit plug come into contact with each other, the push plate moves forward through the engagement pin. The switchboard according to claim 1, wherein the lock lever is tilted so that the engagement roller is disengaged from the key portion. 3. The shutter lock mechanism is rotatably supported by an engagement roller provided at a central portion of the shutter lever and a support pin provided on the side plate, and extends firstly on both sides of the support pin. An arm and a second arm, the seesaw lever adapted to allow the first arm to engage with the engagement roller; a torsion spring acting to keep the seesaw lever always horizontal; A lock lever having a tip roller rotatably supported by a support pin provided on the side plate and engaging with the second arm provided at the tip, and an engagement pin provided at an intermediate portion; A torsion spring acting to return to the position, and a push plate provided on the carriage and capable of engaging with the engagement pin, wherein the carriage is located at a position where the main circuit fixing terminal and the main circuit plug come into contact with each other. Progress 2. The switchboard according to claim 1, wherein the push plate tilts the lock lever via the engagement pin so that the engagement roller is disengaged from the seesaw lever.