JPH0698427A - Outdoor type enclosed switchboard - Google Patents

Abstract

PURPOSE:To reduce maintenance and inspection works and increase a ventilating efficiency in an outdoor type enclosed switchboard. CONSTITUTION:Electric instruments are contained in a box body 21 having a ventilating port unit consisting of a suction port 24 and an exhaust port 31. A heat generating body 34, generating ascending air stream, is provided through the exhaust port 31. A shielding plate 29, displaced through a driving unit 33, whose configuration is changed by the generation of heat of the heat generating body 34, is provided in the exhaust port 31. A sensor 35 detecting snow fall and/or rain fall and stopping the excitation of the heat generating body 34 is provided on the outside of the box body 21. In this case, the shielding plate 29 can be displaced through the driving unit, controlled by the excitation or interruption of excitation of the heat generating body 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor type closed switchboard, and particularly, when the temperature inside the panel rises due to the operation of electric equipment housed inside a box, ventilation is smoothly performed. It relates to an outdoor type closed switchboard.

[0002]

2. Description of the Related Art In general, an outdoor type closed switchboard in which electrical equipment such as a circuit breaker for a main circuit device, an auxiliary relay for a transformer or a control circuit device, a meter and an electric wire is housed is a Since the temperature inside the panel rises due to the heat generated by the conductor, a ventilation port section including an intake port and an exhaust port is provided in order to keep the temperature below a predetermined temperature. FIG. 7 is a perspective view showing a state in which two outdoor closed switchboards each having a ventilation opening of a different configuration are provided side by side, and FIG. 8 is a sectional view taken along the line AA of FIG. FIG. 8 is a sectional view taken along the line BB of FIG. 7.

One of the outdoor type closed switchboards shown in FIGS. 7 and 8 has an intake port 4 in which an opening 2 is provided in a lower portion of a door 1a of a box 1 and a dustproof filter 3 is provided in the opening 2.
And an evacuation part including an opening part 5 provided on the eave part 1c of the roof part 1b and an exhaust port 7 provided with a dustproof filter 6 on the opening part 5.

Further, the other outdoor closed switchboard shown in FIGS. 7 and 9 is provided with a ventilating portion consisting of an inlet 12 and an exhaust 14 in the shape of a slanted door at the upper and lower portions of the door 11a of the box 11. .

Accordingly, when the electric equipment (not shown) or the bus bar conductor (not shown) housed in the box 1 or 11 generates heat due to the operation and the temperature inside the board rises, the raised air is discharged through the exhaust port 7 or 14.
Is discharged to the outside through the intake port 4 or 1
External air flows in from 2 to cool the electric devices and the busbar conductors and prevent the temperature from rising above a predetermined temperature.

[0006]

However, in the above-mentioned ventilation port portion, the ventilation efficiency is poor, and therefore a fan is provided at the exhaust ports 8 and 14 to improve the ventilation efficiency. However, there was a problem that maintenance and inspection work was required many times. Further, the outdoor closed switchboard has a problem that the ventilation efficiency is low because the box 1 or 11 cannot be provided with an exhaust port due to rainfall, snowfall, and the like. An object of the present invention is to provide an outdoor type closed switchboard which can improve ventilation efficiency by reducing maintenance work.

[0007]

According to the present invention, there is provided an outdoor closed switchboard in which an electric device is housed inside a box having a ventilation opening including an intake opening and an exhaust opening, and the exhaust opening is provided near the exhaust opening. A heating element for generating an ascending air flow through the exhaust port, a shielding plate that is displaced through a drive unit that changes its shape due to the heat generation of the heating element, is provided at the exhaust port, and snow or rain falls outside the box body. It is characterized in that a sensor is provided for sensing the current and stopping the energization of the heating element. In this case, the shield plate may be displaced via a drive unit that is controlled by turning on and off the heating element.

[0008]

The heating element provided at the exhaust port is heated to detect the temperature of the heating element, and the drive section which changes its shape by sensing the heating temperature or the driving section which is controlled by energizing the heating element drives the shield plate to open the exhaust port. open. Further, the heat generation of the heating element causes an ascending airflow, and the ascending airflow allows efficient ventilation. The sensor detects rain, snow, etc., stops energization of the heating element, drives the shield plate by the drive unit, closes the exhaust port, and prevents rain, snow, etc. from entering.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention,
FIG. 2 is a sectional view taken along the line AA of FIG. The outdoor closed switchboard shown in FIG. 1 and FIG. 2 accommodates a bus bar conductor (not shown) inside the box body 21 and an electric device including a plurality of circuit breakers (not shown) connected to the bus bar conductor.
Forming multiple feeders. Further, the box body 21 is provided with an air intake port 24 provided at the lower portion, and a ventilation port portion including exhaust ports 31 and 32 provided on the lower surfaces of the roof portion 21b and the eaves portion 21c, respectively. The intake port 24 is provided with an opening 22 at a lower portion of the door 21a of the box body 21 and a dustproof filter 23 provided at the opening 22. The exhaust ports 31 and 32 are provided with dustproof filters 27 and 28 in openings 25 and 26 provided on the upper surface of the roof 21b and the lower surface of the eaves 21c of the box body 21, respectively. The exhaust port 31 is provided with a shield plate 29 for opening and closing the opening 26 and a drive unit 33 for opening and closing the shield plate 29. In the vicinity of the opening 26, heat is generated by energization and the opening 26 is opened. A heating element 34 for generating an ascending airflow is provided. The heating element 34 is composed of a tape-shaped heater, and the temperature sensor 34 a provided inside the box body 21 controls the on / off of the electricity depending on the temperature inside the box body 21. The drive unit 33 is made of, for example, a shape memory alloy, is bent in a dogleg shape at room temperature, and has a heating element 34.
When the temperature rises due to the heat generation of, the shape changes so as to extend in a straight line. One end is attached to the support plate 37 provided on the inner side surface of the box body 21, and the other end is shielded.
9 is connected to the inner side surface.

Further, on the upper surface of the roof portion 21b, a sensor 35 for detecting rainfall, snowfall, etc. to control the energization of the heating element 34.
Is provided. As shown in FIGS. 5 and 6, in this sensor 35, when rain, snow or the like is accumulated in the sensing box 35a, the first electrode 35b and the second electrode 34c are brought into conduction with each other, and
It is designed to detect snow, etc.

Next, the operation of the embodiment configured as described above will be described. When the electric equipment and the busbar conductor housed in the box body 21 generate heat by operation and the temperature inside the board rises, the temperature sensor 34a operates to supply electric power from a power source (not shown) to energize the heating element 34. When the heating element 34 generates heat, the temperature rise thereof causes the shape memory alloy forming the drive unit 33 to sense this, and as shown in FIGS. 3 and 4, the shape memory alloy is deformed so as to extend linearly, and the shielding plate 29 is lifted and exhausted. Open mouth 31.

Therefore, the temperature of the air in the panel rises due to the heat generated by the heat generating element 34 to generate an ascending airflow and is exhausted to the outside through the exhaust port 31. Corresponding to this, the outside air flows in from the intake port 24 to ventilate the inside of the board.

If rainfall, snowfall, or the like occurs during the ventilation, the sensor 35 detects it and stops the heating element 33 from being energized. As a result, when the temperature of the heating element 33 decreases, the driving portion 33 bends again into the original doglegged shape, pulls back the shielding plate 29, closes the exhaust port 32, rains,
Prevents the entry of snow.

In the above embodiment, the case where the shape memory alloy is used as the drive unit 33 has been described. However, when an electromagnetic induction device such as a motor is used and the heating element is energized, the shield plate is lifted to open the exhaust port. The drive unit may be controlled by turning on and off the heating element so that the shield plate is returned to its original position when the energization is stopped and the energization is stopped.

[0015]

As described above, according to the present invention, the heating element provided in the upper part of the box body generates an ascending airflow for ventilation, and when rain or snow falls, it is detected. By providing a structure in which the exhaust port is closed, it is possible to provide an outdoor closed switchboard that can efficiently ventilate the inside of the panel, and does not use a fan with many malfunctions so that maintenance work can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a closed switchboard according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic sectional view showing an operating state of an embodiment of the present invention.

4 is a sectional view taken along the line AA of FIG.

5 is a perspective view of a main part of FIG.

6 is a sectional view taken along the line AA of FIG.

FIG. 7 is a perspective view showing a state in which conventional closed switchboards having ventilation openings of different configurations are provided side by side.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

Reference numeral 21 is a box, 24 is an inlet, 26 is an opening, 29 is a shield, 31 and 32 are exhausts, 33 is a driving unit, 34 is a heating element, 34a is a temperature sensor, 35 is snow or rain. It shows the sensor that does.

Claims (2)

[Claims] 1. An outdoor-type closed switchboard in which electrical equipment is housed inside a box having a ventilation opening including an intake opening and an exhaust opening, and heat is generated near the exhaust opening by energization to generate an updraft through the exhaust opening. In addition to providing a heating element to be generated, a shielding plate is provided at the exhaust port, which is displaced through a drive unit that changes shape due to heat generation of the heating element, and the outside of the box body is sensed as snow or rain, and An outdoor closed switchboard, which is equipped with a sensor for stopping the power supply to the heating element. 2. An outdoor-type closed switchboard in which electrical equipment is housed inside a box having a ventilation opening including an intake opening and an exhaust opening, in the vicinity of the exhaust opening, heat is generated by energization, and an ascending airflow is generated through the exhaust opening. In addition to providing a heating element to be generated, a shielding plate is provided at the exhaust port, which is displaced through a drive member that is controlled by electrical connection and disconnection to the heating element, and detects snow or rain on the outside of the box body. An outdoor closed switchboard is further provided with a sensor for displacing the shield plate in the closing direction via the drive unit.