JP2018042299A - Ventilation device and cubicle type high-voltage power reception device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation device which prevents a moisture condensation from being generated on a surface of inner equipment pf a cubicle type high-voltage power reception device, and the cubicle type high-voltage power reception device using the ventilation device.SOLUTION: A cubicle type high-voltage power reception device 1 in which a power incoming device required in a housing 14 is housed and a ventilation hole 141 is formed to one surface of the housing, comprises: a door piece 21 that is mounted to the ventilation hole, and can be operated to an opening position OP opening the ventilation hole and a closing position closing the ventilation hole; and an open/close driving mechanism 22 including a temperature sensing driving member 28b that operates the door piece to the closing position when an air temperature sucked to the housing from the ventilation hole is less than a reference temperature T1 causing a dew condensation on a surface of the power incoming device, and operates the door piece to the opening position when the air temperature is larger than the reference temperature T1.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a ventilator and a cubicle type high voltage power receiving apparatus using the ventilator.

  There is known a cubicle type high voltage power receiving device in which a ventilation device is arranged in an inner space formed inside a raised portion of a roof body, and an exhaust hole is formed in a side plate of the roof body (Patent Document 1).

JP-A-8-33127

  In the ventilating structure of the conventional cubicle type high voltage power receiving device, by operating the ventilator (7), outside air is introduced into the casing from the intake hole (37) formed in the side wall (36), and is generated in the transformer. The heat is exhausted from the exhaust hole (10) while cooling. However, when cold air is introduced into the casing, there is a problem that condensation occurs on the surfaces of transformers, high-voltage circuit devices, instruments, and other internal devices.

  The problem to be solved by the present invention is to provide a ventilator capable of preventing condensation on the surface of the internal equipment of the cubicle type high voltage power receiving device and a cubicle type high voltage power receiving device using the same.

  The present invention relates to a cubicle type high-voltage power receiving device in which necessary power receiving equipment is housed in a housing, and a ventilation port is formed on one surface of the housing, and an open position that is attached to the ventilation port and opens the ventilation port. When the door piece operable to the closed position to be closed and the temperature of the air sucked into the housing from the ventilation port is equal to or lower than a reference temperature causing condensation on the surface of the power receiving device, the door piece is closed. And an open / close drive mechanism including a temperature-sensitive drive member that moves the door piece to the open position when the reference temperature is exceeded.

  According to the present invention, the opening / closing drive mechanism including the temperature-sensitive drive member closes the ventilation port when the intake air temperature is equal to or lower than the reference temperature at which dew condensation occurs. be able to.

1 is an internal schematic configuration diagram showing an embodiment of a cubicle type high-voltage power receiving device according to the present invention. It is a disassembled perspective view which shows one Embodiment of the ventilation apparatus which concerns on this invention. It is a top view which shows operation | movement of the moving member of FIG. 2, (a) shows the left movement (closed position), (b) shows the right movement (open position). It is a graph which shows an example of the temperature-displacement curve of the compression spring made from a shape memory alloy of FIG. It is a cross-sectional view which shows operation | movement of the door piece of FIG. 2, (a) shows the obstruction | occlusion position and (b) shows an open position. It is a cross-sectional view which shows the other example of the door piece and opening / closing drive mechanism of FIG. It is a cross-sectional view which shows the further another example of the door piece and opening / closing drive mechanism of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an internal schematic configuration diagram showing an embodiment of a cubicle type high voltage power receiving apparatus according to the present invention. In the cubicle type high voltage power receiving device 1 of the present embodiment, a trunk frame 12 made of a rectangular parallelepiped panel plate is placed on a base frame 11, and a roof body 13 having a flat plate shape and inclined on one side is formed on the trunk frame 12. It is installed. Further, inside the casing 14 constituted by the frame 11, the trunk frame 12, and the roof body 13, a three-phase power circuit transformer 15, a single-phase power circuit transformer 16, and an instrument transformer 17 are provided. A load switch 18 and a wiring 19 are provided. Further, ventilation ports 141 and 141 for ventilating the inside of the housing 14 are respectively formed on the side walls of the body frame 12 facing each other, and the ventilation device 2 including the door piece 21 and the opening / closing drive mechanism 22 therein. Is provided. Note that the structure of the cubicle type high-voltage power receiving device shown in FIG. 1 is merely an example for explaining the present invention, and the present invention is not limited to this structure.

  The ventilation device 2 provided in the ventilation port 141 includes a door piece 21 that can be operated at an open position OP that opens the ventilation port 141 and a closing position SP that closes the ventilation port 141, and an opening / closing drive mechanism 22. The open / close drive mechanism 22 is configured such that the air temperature sucked into the housing 14 from the ventilation port 141 is changed to a three-phase power circuit transformer 15, a single-phase power circuit transformer 16, an instrument transformer 17, When the temperature is below the reference temperature that causes condensation on the surface of the load switch 18 and the power receiving device such as the wiring 19, the door piece 21 is moved to the closed position SP, and when the reference temperature is exceeded, the door piece 21 is opened. It includes a temperature-sensitive drive member such as a compression spring made of a shape memory alloy that is operated by the OP.

  The revolving door body 23 including the door piece 21 has an upper end member 231 on the upper side and a lower end member 232 on the lower side, both of which are formed in an equilateral triangle, and an upper end shaft 231 a of the upper end member 231 and a lower end of the lower end member 232. The shaft 232a is rotatable about the shaft 232a. In the rotating door body 23 according to the present embodiment, the panel-like door piece 21 is fixed to one surface between the upper end member 231 and the lower end member 232 formed in a regular triangle, and nothing is fixed to the other two surfaces. Without being able to pass outside air. In addition, in order to ensure the strength of the rotating door body 23, the door piece 21 is extended or provided on a part of two surfaces other than the one surface to which the door piece 21 is fixed. Alternatively, the erection member 24 may be provided between vertices facing one surface.

  The upper end of the rotating door body 23 of this embodiment is attached to the upper plate 25. The upper plate 25 is provided with through holes 251 for attaching the four rotating door bodies 23. An upper end shaft 231 a of the rotary door body 23 is inserted into the through hole 251, and the through hole 251 and the upper end shaft 231 a are positioned via a bearing metal 252. The upper end shaft 231a positioned inside the bearing metal 252 is screwed with a bolt 253 via a washer and a bearing metal 252 and a low-contact-resistance thrust bearing such as a thrust ball bearing and a sliding ring constituting a dry bearing. Has been. That is, the upper end shaft 231a is firmly tightened with the bolt 253 via the washer and the sliding ring. Therefore, the rotating door body 23 rotates integrally with the sliding ring, and the flange portion on the upper surface of the bearing metal 252 and the sliding ring rotate in a low friction resistance state.

  The lower end of the rotating door body 23 is attached to the lower plate 26. The lower plate 26 is formed with columnar protrusions 261 to which the four rotating door bodies 23 are attached, respectively. A low frictional resistance sleeve 262 that functions as a bearing is inserted into each protrusion 261, and the sleeve 262 is fitted inside the lower end shaft 232 a of the lower end member 232 of the rotating door body 23. A pinion 232b is formed outside the lower end of the lower end shaft 232a. The sleeve 262 is located inside the pinion 232b and is fixed to the protrusion 261. The horizontal movement is restrained by fitting between the sleeve 262 and the lower end shaft 232a, but the lower end shaft 232a of the lower end member 232 is rotatable with respect to the circumferential direction of the sleeve 262. At this time, a slight gap is provided between the lower end of the lower end shaft 232a of the lower end member 232 and the upper surface of the lower plate 26, and they are set so as not to contact each other. That is, the rotating door body 23 is cantilevered only on the upper plate 25 side.

  On the upper surface of the lower plate 26, a left rotation stopper 263 that restricts left rotation and a right rotation stopper 264 that restricts right rotation of the rotation door body 23 are provided. In addition, a contact protrusion 232c that protrudes downward is provided at one vertex of the triangular lower surface of the lower end member 232, and a contact protrusion 232d that protrudes downward is also provided at the other vertex. Yes. The abutment protrusion 232c abuts against the right rotation stopper 264 to restrain the rotation door body 23 from further clockwise rotation. At this time, the door pieces 21 face each other so as to block the ventilation port 141. Become one. Conversely, the abutment protrusion 232d abuts against the left rotation stopper 263 to restrain the rotation door body 23 from further leftward rotation. At this time, the door pieces 21 open the ventilation port 141 to each other. It becomes a parallel rotation position. In other words, one of the two surfaces other than the door piece 21 is flush with each other. In the present embodiment, the left rotation stopper 263 is provided so as to contact the contact protrusion 232d at a position where the rotation door body 23 rotates 120 °, but the rotation door body 23 is 60 ° to 120 °. It may be provided so as to come into contact with the contact protrusion 232d at the position where it rotates.

  Here, the length of the door piece 21 of the rotating door body 23 is determined by the distance between the upper plate 25 and the lower plate 26, and the rotation of the rotating door body 23 is a flange portion on the upper surface of the bearing metal 252. The sliding ring rotates in a low frictional resistance state, whereby the torque for rotating the rotating door body 23 is determined. Since the weight of the door piece 21 between the upper plate 25 and the lower plate 26 has a small influence on the torque, the axial length of the door piece 21 can be increased. As a result, the present invention can also be applied to a ventilation port 141 having a large opening area. Incidentally, although the ventilation apparatus 1 of this embodiment assumes mounting | wearing with the ventilation port 141 with the attitude | position located in the vertical direction as shown in FIG. 2, the weight of the door piece 21 is light. For this reason, or by making the door piece 21 of aluminum or resin to reduce the weight, the door piece 21 may be attached to the ventilation port 141 in a posture in which the door piece 21 is aligned in the horizontal direction.

  A moving member 27 is attached to the lower plate 26. Two guide protrusions 265 (only one is shown in FIG. 2, but another guide protrusion is formed on the right side of the figure) are formed on the upper surface of the lower plate 26. A small sliding washer 266 is fitted, and a bush 267 having a small outer peripheral contact resistance is fitted into each guide projection 265. A guide hole 271 made of a long hole formed in the moving member 27 is fitted into the bush 267 to facilitate linear movement of the moving member 27. Further, the bushing 267 is not detached from the guide protrusion 265 and is screwed to the guide protrusion 265 with a screw 268. As a result, the separation and movement of the guide projection 265 parallel to the protruding direction are restricted.

  A pinion 232b formed at the lower end of the lower end shaft 232a is formed on one side in the length direction of the moving member 27, that is, on the long side of the rack hole 272 having a slightly larger shape than the guide hole 271. A meshing rack 273 is formed. Therefore, the rack 273 moves left and right by the left and right linear movement of the moving member 27 in the length direction, the pinion 232b that meshes with the rack 273 rotates, and the rotating door body 23 rotates.

  Hook portions 274 and 275 are formed at right angles to the length direction of the moving member 27 and on both sides. Between the hook portion 274 and the pin 269a provided on the upper surface of the lower plate 26, expansion and contraction due to temperature. For example, a stainless steel compression spring 28 having a very low characteristic (extremely small linear expansion) is provided and urged to shrink in a direction to narrow the gap therebetween. Further, a compression spring 28b made of a shape memory alloy is provided between the hook portion 275 and the pin 269b provided on the upper surface of the lower plate 26, and contracts and urges in a direction to narrow the gap therebetween.

  Here, in the compression spring made of shape memory alloy of the present embodiment, the air temperature sucked into the housing 14 from the ventilation port 141 is such that the three-phase power circuit transformer 15 and the single-phase power circuit transformer 16 are used. In addition, the reference temperature that causes condensation on the surface of the power receiving device such as the instrument transformer 17, the load switch 18, and the wiring 19 is set as the transformation point. For example, when the temperature in the housing is 20 ° C. and the humidity is 50%, dew condensation occurs at 9.6 ° C. or less, so the reference temperature can be set to 9.6 ° C.

  That is, in the compression spring 28b made of the shape memory alloy of the present embodiment, at a temperature equal to or higher than the reference temperature, each turn portion of the spring coil has a high compression density (relatively large elastic force), and conversely the reference At a temperature lower than the temperature, each turn portion of the spring coil is memorized so that its compression density is rough (elastic force is relatively small). At a temperature equal to or higher than the reference temperature, the elastic force (contracting force) of the shape memory alloy compression spring 28b is larger than the elastic force (contracting force) of the stainless steel compression spring 28a. The elastic force of the compression spring 28a made of stainless steel and the elastic force (contraction force) of the compression spring 28a made of stainless steel are made larger than the elastic force (contraction force) of the compression spring 28b made of shape memory alloy. The elastic force of the compression spring 28b is set.

  FIG. 4 is a graph showing an example of a temperature-displacement curve of the shape memory alloy compression spring 28b. In the temperature-displacement curve of the compression spring 28b made of the shape memory alloy, when the temperature is lowered from a temperature higher than the reference temperature to a temperature lower than the reference temperature, the change of the displacement stored at the temperature T1 starts, but from the reference temperature. When the temperature is raised from a low temperature to a temperature higher than the reference temperature, the displacement stored at the temperature T2 is restored. Such hysteresis appears in the compression spring 28b made of shape memory alloy. In the present embodiment, since the purpose is to close the ventilation port 141 when the outside air temperature is lower than the dew point temperature, the ventilation port 141 is normally opened, the shape memory alloy compression spring 28b is used when the temperature is lowered. It is preferable to set the temperature T1 at which the displacement changes to the reference temperature.

  FIG. 3 is a plan view showing the operation of the moving member 27 due to a change in relative elastic force between the stainless steel compression spring 28a and the shape memory alloy compression spring 28b, where (a) is a left movement and (b) is a right movement. Indicates. FIG. 5 is a cross-sectional view showing the operation of the door piece 21 corresponding to FIG. 3, wherein (a) shows a closed position and (b) shows an open position. When the temperature is lowered from a high temperature to a low temperature, for example, 9.6 ° C. or less of the reference temperature T1, the shape memory alloy compression spring 28b for urging the moving member 27 in the right direction includes each spring coil. The turn part becomes rough and the elastic force becomes relatively small. For this reason, the elastic force of the stainless steel compression spring 28a that urges the moving member 27 in the left direction is larger than the elastic force of the compression spring 28b made of the shape memory alloy. As a result, as shown in FIG. 3A, the moving member 27 moves to the left, thereby rotating the rotating door body 23 clockwise (clockwise). The door piece 21 provided on one surface of the rotating door body 23 becomes a position SP where the ventilation port 141 is closed.

  In contrast, when the temperature T2 exceeds the reference temperature 9.6 ° C. in the present embodiment, for example, exceeds the hysteresis shown in FIG. 4, the moving member 27 is urged to the right. In the shape memory alloy compression spring 28b, the turn portions of the spring coil become dense, and the elastic force becomes relatively large. For this reason, the elastic force of the compression spring 28b made of shape memory alloy becomes larger than the elastic force of the compression spring 28a made of stainless steel that urges the moving member 27 leftward. As a result, as shown in FIG. 3B, the moving member 27 moves in the right direction, thereby rotating the rotating door body 23 counterclockwise (as shown in FIG. 5B). The door piece 21 provided on one surface of the rotating door body 23 is a position OP at which the ventilation port 141 is opened.

  5A and 5B, the reference numeral 211 indicates the adjacent door piece 21 when the door piece 21 moves to the closed position SP where the ventilation port 141 is closed as shown in FIG. Or it is a tongue piece which obstruct | occludes the clearance gap extended in the rotation axis direction with the ventilation port 141. FIG. The tongue piece 211 is made of a flexible material such as rubber or elastic resin, and is extended and fixed in the longitudinal direction of each door piece 21. The tongue piece 211 can enhance the sealing performance of the ventilation port 141. Moreover, although the four rotation door bodies 23 of this embodiment were provided in one ventilation port 141, this invention is not limited to the quantity of the rotation door bodies 23. FIG. However, when it is configured with about 2 to 5 sheets as in the present embodiment, there is an advantage that the contact resistance of each rotary door body 23 is relatively small and the mechanical strength can be increased.

  The door piece 21 of the present invention is provided on one surface of the rotary door body 23 composed of the upper end member 231 and the lower end member 232 having a regular triangle cross section, and the upper end member 231 and the lower end member 232 are omitted instead. The door piece 21 may be provided directly or indirectly between the upper end shaft 231a and the lower end shaft 232a. FIG. 6 is a cross-sectional view showing another example of the door piece 21 and the moving member 27. The embodiment shown in the figure is the same as the embodiment shown in FIGS. 2 to 5 except that the upper end member 231 and the lower end member 232 are omitted. Even when the door piece 21 is provided directly or indirectly between the upper end shaft 231a and the lower end shaft 232a, when the moving member 27 moves leftward as shown by a solid line in FIG. When the moving member 27 moves to the right as shown by a two-dot chain line in the drawing, the door piece 21 rotates to the open position OP that opens the ventilation port 141.

  Moreover, in the embodiment mentioned above, the structure which opens and closes the ventilation opening 141 by rotating the door piece 21 was shown, However, The ventilation apparatus 2 of this invention is not limited only to a rotation type, The door piece 21 is right and left. It may be a slide type that reciprocates. FIG. 7 is a cross-sectional view showing still another example of the door piece 21 and the moving member 27. In the embodiment shown in the figure, the rack and pinion mechanism is omitted in addition to the upper end member 231 and the lower end member 232, and the stainless steel compression spring 28a and the shape memory alloy are formed in the same manner as the embodiment shown in FIGS. The moving member 27 is reciprocated left and right by the compression spring 28b. And the ventilation port 141 formed in the trunk frame 12 of the housing | casing 14 is made into several slit shape, as shown in FIG. The slit interval in this case is determined by the relationship between the moving distance of the moving member 27 and the width of the door piece 21. Even in the case of the slide type as described above, when the moving member 27 moves to the left as shown by the solid line in FIG. 7, the door piece 21 rotates to the open position OP that opens the ventilation port 141, and FIG. When the moving member 27 moves in the right direction as indicated by a dotted line, the door piece 21 rotates to the closing position SP where the ventilation port 141 is closed.

  The above-described rotating door body 23, upper plate 25, lower plate 26, moving member 27, stainless steel compression spring 28a, and shape memory alloy compression spring 28b correspond to the opening / closing drive mechanism 22 of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Cubicle type high voltage power receiving device 11 ... Underframe 12 ... Trunk frame 13 ... Roof body 14 ... Housing 141 ... Ventilation opening 15 ... Three-phase power circuit transformer 16 ... Single-phase power circuit transformer 17 ... Instrument transformer 18 ... Load switch 19 ... Wiring 2 ... Ventilation device 21 ... Door piece 22 ... Opening / closing drive mechanism 23 ... Rotating door 231 ... Upper end member 231a ... Upper end shaft 232 ... Lower end member 232a ... Lower end shaft 232b ... Pinion 232c, 232d ... contact projection 24 ... installation member 25 ... upper plate 251 ... through hole 252 ... bearing metal 253 ... bolt 26 ... lower plate 261 ... projection 262 ... sleeve 263 ... left rotation stopper 264 ... right rotation stopper 265 ... guide projection 266 ... sliding washer 267 ... bush 268 ... screw 269a, 269b ... pin 27 ... moving member 271 ... guide hole 272 ... Rack hole 273 ... Rack 274, 275 ... Hook 28a ... Stainless steel compression spring 28b ... Shape memory alloy compression spring (temperature sensitive drive member)

Claims (5)

A required power receiving device is housed in the housing, and the cubicle type high-voltage power receiving device in which a ventilation port is formed on one surface of the housing is attached to the ventilation port,
A door piece operable in an open position for opening the vent and a closed position for closing;
When the temperature of the air sucked into the housing from the ventilation port is equal to or lower than a reference temperature that causes condensation on the surface of the power receiving device, the door piece is moved to the closed position, and when the temperature exceeds the reference temperature, the door An open / close drive mechanism including a temperature-sensitive drive member that moves the piece to the open position. The opening / closing drive mechanism is
A rotating door body that is supported directly or indirectly with respect to the housing via a rotating shaft and has at least one surface as the door piece with the rotating shaft as a center. ,
A pinion provided on the pivot shaft;
A moving member provided so as to be able to reciprocate in a reciprocating direction orthogonal to the rotation axis directly or indirectly with respect to the housing, and the rack along the reciprocating direction meshing with the pinion A reciprocating movement of the rack is converted to a rotational force of the rotating door body via the pinion, and
A first elastic body connected between the moving member and a fixed side of the housing, and biasing the moving member in one of the reciprocating directions;
A second elastic body made of a shape memory alloy that is connected between the moving member and the fixed side of the housing and biases the moving member to the other of the reciprocating direction;
When the moving member moves to one of the reciprocating directions, the door piece opens the ventilation port, and when the moving member moves to the other of the reciprocating direction, the door piece closes the ventilation port,
When the air temperature sucked into the housing exceeds the reference temperature, the biasing force of the first elastic body is larger than the biasing force of the second elastic body, and the air temperature sucked into the housing is the reference temperature. The ventilation apparatus according to claim 1, wherein when the temperature is equal to or lower than the temperature, the biasing force of the first elastic body is smaller than the biasing force of the second elastic body.   The rotating door body is formed in a triangular prism shape having three side surfaces with the rotating shaft as the center, and one of the three side surfaces is used as the door piece, and the other two side surfaces pass through the intake air. The ventilation device according to claim 2, wherein the opening is a possible opening. Including a plurality of door pieces that are simultaneously opened and closed by the opening and closing drive mechanism;
The ventilator according to any one of claims 1 to 3, further comprising a tongue piece that closes a gap extending in a longitudinal direction with an adjacent door piece when the door piece moves to the closed position. In a cubicle type high voltage power receiving device in which necessary power receiving equipment is housed in a housing,
A ventilation opening formed on one surface of the housing;
A door piece that is provided at the vent and is operable in an open position for opening the vent and a closed position for closing;
When the temperature of the air sucked into the housing from the ventilation port is equal to or lower than a reference temperature that causes condensation on the surface of the power receiving device, the door piece is moved to the closed position, and when the temperature exceeds the reference temperature, the door A cubicle type high-voltage power receiving device comprising: an open / close drive mechanism including a temperature-sensitive drive member that moves the piece to an open position.

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