JP5139254B2 - Metal closure type switchgear door fixing device - Google Patents

Description

  The present invention relates to a door closing device for a metal closed switchgear that can firmly fix an openable / closable door that closes an opening of a box of the metal closed switchgear.

Conventionally, in this type of door fixing device, a vertically movable rod connected to the handle of the door is provided on a locking bracket provided on the upper frame of the opening of the box and on the lower frame of the opening. It is known that the door is fixed by being locked to each of the locking metal fittings. Since the doors are fixed at the upper and lower portions, the door is not easily opened even when the internal pressure is increased by an internal arc or the like (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-168210 (page 3, FIG. 1)

  The above-described conventional metal closure type switchgear door fixing device has the following problems. The pressure increase due to the internal arc reaches a maximum value in a short time, and the pressure value varies depending on the power source capacity and the arc point. If the power supply capacity is large and the phase is short-circuited near the door, excessive pressure is applied to the door.

  Although the door is fixed at the upper and lower portions, if excessive pressure is applied to the entire door, the intermediate portion may be deformed so as to bulge outward, and arc gas may be ejected to the outside from this portion. For this reason, the door fixing device which can suppress the swelling of the intermediate part of a door at the time of a pressure rise and can fix a door more firmly was desired.

  The present invention has been made to solve the above problem, and provides a door closing device for a metal closed type switchgear that can suppress the deformation of the door and fix the door more firmly when the pressure in the box rises. Objective.

In order to achieve the above object, a door fixing device for a metal closed switchgear according to the present invention is provided on a box body having an opening, a door that opens and closes the opening, and an outside of the door. Door fixing of a metal closed type switchgear having a handle, a movable device provided inside the door and connected to the handle, and a fixing device provided on the box and locking the movable device. The movable device includes a fixed groove formed in a vertical direction of the door, a movable metal movably movable in the fixed groove, and a movable metal connected to the handle, and a vertical movement of the movable metal A plurality of fixing pins arranged in a direction, and the fixing device includes a fixing plate having a plurality of locking grooves for locking the fixing pins, and the movable fitting is formed in a U-shaped cross section, When the door is closed Placing the fixed plate in a U-shaped opening portion of the movable bracket, characterized in that the said movable bracket and the fixed plate and the interleaved structure.

  According to the present invention, a plurality of fixing pins movable in the vertical direction of the door are provided, and the fixing plate provided with the locking groove for locking the fixing pin on the box side is fixed. However, the door is fixed at a plurality of points in the up and down direction, the swelling of the door can be suppressed, and the door can be firmly fixed.

  Since the plurality of fixing pins are arranged at equal intervals in the vertical direction of the door and the locking grooves for locking the plurality of fixing pins are provided on the box body side, the door can be fixed more firmly. Embodiments of the present invention will be described below with reference to the drawings.

  First, a door fixing device for a metal closed switchgear according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the configuration of a metal closed switchgear door fixing device according to a first embodiment of the present invention. FIG. 2 is a perspective view of the metal closed switchgear door fixing device according to the first embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view showing a configuration of a door closing device for a metal closed switchgear according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the opening 2 of the box 1 is provided with an openable / closable door 4 whose one side is fixed by a hinge 3. The other side of the door 4 is bent in an L shape on the box 1 side, and is formed on a plate-like first upper and lower plate 5. A plate-like second upper and lower plate 6 is provided substantially parallel to the first upper and lower plate 5, and the first upper and lower plate 5 and the second upper and lower plate 6 have a U-shaped cross section extending in a groove shape in the vertical direction. The fixing groove 7 is formed. The first upper and lower plate 5 and the second upper and lower plate 6 are provided with a plurality of opening holes 8 having an oval shape in the vertical direction at equal intervals in the vertical direction. That is, the opening holes 8 are provided on both side surfaces of the fixing groove 7. An equal interval includes errors such as processing and assembly.

  In the fixed groove 7, a movable metal fitting 9 having a U-shaped cross section that is movable in the vertical direction is provided from the ceiling to the floor. The movable metal fitting 9 is provided with a plurality of fixed pins 10 that are horizontally arranged at equal intervals in the vertical direction so as to be rotatable. The equally spaced and horizontal arrangement includes errors such as processing and assembly.

  The fixed pin 10 passes through both ends of the movable metal fitting 9 and extends to the opening hole 8. C-rings 11 are provided at both ends of the fixing pin 10 so that the fixing pin 10 cannot be removed from the opening hole 8. A linear handle 12 that is movable outside in the vertical direction and is provided outside the door 4 is fixed to the U-shaped bottom of the middle part of the movable metal fitting 9.

  Two fixed plates 13 are provided on the box 1 side facing the movable metal fitting 9 at a predetermined interval in the vertical direction. The fixed plate 13 is provided with a plurality of locking grooves 14 that face the side surfaces of the fixed pin 10 when the direct acting handle 12 is lifted. The locking groove 14 is L-shaped and is composed of a horizontal portion 14a in the horizontal direction and a vertical lower portion 14b in the vertical direction.

  Next, a method for closing and fixing the door 4 will be described with reference to FIGS.

  As shown in FIG. 2, the direct acting handle 12 is lifted to close the door 4. Then, the side surface of each fixing pin 10 reaches the upper part of the vertical lower part 14 b through the horizontal part 14 a of the locking groove 14. When the direct-acting handle 12 is lowered, the end of the fixing pin 10 moves through the opening hole 8, and the side surface stops at the bottom of the vertical lower portion 14b.

  When this fixed state is viewed from the top, as shown in FIG. 3, the first upper and lower plates 5, the second upper and lower plates 6, the movable metal fitting 9 and the fixed plate 13 are provided from the inside of the box 1 to the outside of the door 4. They will overlap one another. When the door 4 is opened, the direct acting handle 12 is lifted to remove the fixing pin 10 from the locking groove 14.

  Here, the movable metal fitting 9 having the fixed groove 7 and the fixed pin 10 is defined as a movable device for fixing the door 4 provided inside the door 4. The fixing plate 13 having the locking groove 14 is defined as a fixing device provided on the side of the box 1 that locks the movable device.

  When the door 4 is closed, the fixed plate 13 is positioned in the middle of the open portion of the U-shaped movable metal fitting 9, and the movable metal piece 9 on the door 4 side and the fixed plate 13 on the box body 1 side are alternately left and right. This is defined as an alternately arranged structure. Note that the fixed grooves 7 also have an alternately arranged structure.

  From these things, since the several fixing pin 10 arranged in the up-down direction of the door 4 is being fixed to the some locking groove 14, even if a pressure rise occurs in the box 1, the door 4 is firmly fixed. can do. In particular, since the fixing pin 10 is provided also in the middle part of the door 4, the swelling of the middle part can be suppressed.

  Further, the inner and outer sides of the box 1 are alternately arranged by the first upper and lower plates 5, the second upper and lower plates 6, the movable fitting 9 and the fixed plate 13, and the path becomes longer. Can be suppressed. Moreover, since the two fixing plates 13 provided with the locking grooves 14 are provided at a predetermined interval, the locking of the fixing pins 10 is stabilized and the mechanical strength can be improved.

  According to the door fixing device for the metal closed switchgear of the first embodiment, a plurality of fixing pins 10 are arranged in the vertical direction of the door 4 and a plurality of locking grooves for locking the fixing pins 10 on the box body 1 side. Since the fixing plate 13 provided with 14 is fixed, even if the pressure rises in the box 1, the door 4 is fixed at a plurality of points in the vertical direction, and the swelling of the middle part of the door 4 is suppressed. Can do. Moreover, since the movable metal fitting 9, the fixed groove 7, and the fixed plate 13 are arranged alternately, it is possible to suppress the arc gas from being ejected outside the box 1.

  In the first embodiment, the first upper and lower plates 5 and the second upper and lower plates 6 have been described as constituting the fixing groove 7. However, a U-shaped fixing groove is prepared in advance, and the outside of the door 4 is Can be fixed with bolts. In this case, for example, even when the fixing pin 10 and the locking groove 14 are welded by arc gas and it is difficult to open the door 4, the fixing groove can be removed by removing the bolt, and the door 4 can be easily removed. Can be opened.

  Next, a metal closure type switchgear door fixing device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged side view showing the configuration of the door fixing device for the metal closed switchgear according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that an interlock mechanism is provided. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, an interlock pin 15 is provided in at least one locking groove 14.

  During operation of an electrical device such as a circuit breaker housed in the box 1, the interlock pin 15 is disposed in the locking groove 14 from a device (not shown) so that the door 4 cannot be opened or is disconnected. Sometimes the interlock pin 15 is retracted to provide an interlock mechanism that allows the door 4 to be opened and closed.

  According to the door fixing device for the metal closed switchgear of the second embodiment, the same effect as that of the first embodiment can be obtained, and an interlock mechanism for preventing an erroneous operation can be provided for opening and closing the door 4.

  Next, a metal closed switchgear door fixing device according to Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 5 is a front view showing a configuration of a door closing device for a metal closed switchgear according to a third embodiment of the present invention, and FIGS. 6 and 7 illustrate a door fixing of a metal closed switchgear according to a third embodiment of the present invention. It is an enlarged view explaining operation | movement of an apparatus. The third embodiment differs from the first embodiment in a handle provided on the door. In each figure, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, a rotary handle 16 that rotates when the door 4 is opened and closed is provided outside the door 4. As shown in FIG. 6, a first link 18 fixed to the handle shaft 17 of the rotary handle 16 is provided inside the door 4. One end of the second link 19 is connected to the end of the first link 18 by a movable pin 20. The other end of the second link 19 is fixed to the movable metal fitting 9 with a movable pin 21. FIG. 6 shows the door 4 in a closed state.

  When the door 4 is opened, the handle shaft 17 is rotated counterclockwise as shown in FIG. Then, the first link 18 rotates counterclockwise with the handle shaft 17 as a fulcrum, and the movable pin 21 fixed to the second link 19 moves upward. Accordingly, the fixed pin 10 provided on the movable metal fitting 9 also moves upward, and the fixed pin 10 can be removed from the locking groove 14.

  According to the door fixing device for the metal closed switchgear of the third embodiment, the same effect as that of the first embodiment can be obtained, and the rotary handle 16 can be provided with a key for controlling the rotation. Since it is possible, the opening and closing of the door 4 can be managed.

The perspective view which shows the structure of the door fixing device of the metal closed type switchgear which concerns on Example 1 of this invention. The expanded side view which shows the structure of the door fixing device of the metal closed type switchgear which concerns on Example 1 of this invention. The expanded sectional view which shows the structure of the door fixing device of the metal closed type switchgear which concerns on Example 1 of this invention. The expanded side view which shows the structure of the door fixing device of the metal closed type switchgear which concerns on Example 2 of this invention. The front view which shows the structure of the door fixing device of the metal closed type switchgear which concerns on Example 3 of this invention. The enlarged view explaining operation | movement of the door fixing device of the metal closed type switchgear which concerns on Example 3 of this invention. The enlarged view explaining operation | movement of the door fixing device of the metal closed type switchgear which concerns on Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box body 2 Opening part 3 Hinge 4 Door 5 1st upper-and-lower board 6 2nd upper-and-lower board 7 Fixing groove 8 Opening hole 9 Movable metal fitting 10 Fixing pin 11 C ring 12 Direct acting handle 13 Fixing plate 14 Locking groove 14a Horizontal portion 14b Vertical lower portion 15 Interlock pin 16 Rotating handle 17 Handle shaft 18, 19 Link 20, 21 Movable pin

Claims (3)

A box having an opening;
A door that freely opens and closes the opening;
A handle provided outside the door;
A movable device provided inside the door and coupled to the handle;
A door closing device for a metal closed switchgear provided on the box and having a fixing device for locking the movable device,
The movable device includes a fixed groove formed in the vertical direction of the door;
A movable metal fitting that is movably movable in the fixed groove and is coupled to the handle;
It is composed of a plurality of fixed pins arranged in the vertical direction of the movable metal fitting,
The fixing device includes a fixing plate having a plurality of locking grooves for locking the fixing pin ,
The movable bracket is formed in a U-shaped cross section,
When the door is closed, the fixed plate is disposed in the U-shaped opening of the movable metal fitting,
A door fixing device for a metal closed type switchgear, wherein the movable metal fitting and the fixed plate are arranged alternately . The door fixing device for a metal closed switchgear according to claim 1, wherein an interlock mechanism is provided in the locking groove . The door fixing device for a metal closed switchgear according to claim 1 or 2, wherein the fixing groove is fixed to the inside of the door with a bolt .

Images