JPS5979599A - Electric part containing housing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrical component storage system that prevents dew condensation inside a housing that houses electrical components installed outdoors in a power plant or substation, thereby preventing an adverse effect on the electrical components. It is related to the housing.

Conventionally, in order to protect the electrical components inside the electrical parts storage case from air pollution, methods have been used to make the case semi-sealed or provide a ventilation opening with a filter in a part of the case.
During high-temperature periods such as summer and the rainy season, moisture that is taken into the housing during the day becomes supersaturated as the outside air cools down at night, causing damage inside the housing, which can cause electrical components to corrode.
It is known to cause negative effects such as a decrease in the insulation properties of electrical parts.

For this reason, conventional methods for preventing dew condensation inside the housing include installing a space heater inside the housing and heating the inside air to maintain the temperature inside the housing above the dew point. A known method is to use a dehumidifier to remove moisture and lower the dew point inside the housing to prevent condensation.

However, among the above dew condensation prevention methods, the one-type space heater is designed to maintain the temperature inside the casing above the dew point without removing moisture from inside the casing.
If there is a large temperature difference between rise and night, it is necessary to make the space heater space sufficiently large, which poses a problem from an energy saving perspective.

Furthermore, in the method using a dehumidifier, the moisture absorption capacity of the dehumidifier is limited, so if the dehumidifier is considered a consumable item, the dehumidifier must be replaced frequently, resulting in high costs. In addition, when reusing a dehumidifier that has lost its dehumidifying ability due to moisture absorption, it is necessary to ventilate high-temperature dry air into the dehumidifier to drive out the moisture in the dehumidifier. However, this method has drawbacks such as requiring a large-capacity external power source and requiring the dehumidifier and dehumidifier carrier to be heat resistant.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional devices, and after dehumidifying the air inside the electrical component housing by bringing it into contact with the cooling surface of the electronic cooling element, By heating and circulating the air in the electrical component storage case, the air inside the electrical component housing is constantly maintained at a low humidity level, thereby preventing dew condensation from forming on the electrical components.

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows one embodiment of the present invention, and in the figure (
1) is an electrical parts storage case, (2) is an electrical parts storage case (
1) is the electrical parts storage area, (3) is the dehumidifying air path, and (4) is the electrical parts storage area (2) and the dehumidifying air path (3)? A partition plate for forming an air path for partitioning, (5) is an electronic cooling element, (6) is a cooling fin connected to the cooling surface of the electronic cooling element (5), (
7) is a heating fin connected to the heat radiation surface of the electronic cooling element (5), (8) is a blower, and (9) is a dehumidifying air passage (3) that takes in air from the electric fjIs storage section (2). (IOJ is the air outlet for sending the air dehumidified by passing through the dehumidifying air passage (8) back to the electrical parts housing (2); (11) is the air outlet for the cooling fin (6). Drain tank for storing moisture condensed on the surface (foundation)
is the pulp of the drain tank, (tough is the electrical parts storage area (2)
The humidity sensor installed in (14) is an electronic cooling element (
5) and a blower (8),
An electronic cooling element (5) and a blower (8) are operated by a signal from a humidity sensor (13).

Next, the operation of the embodiment will be explained. A control device (14) electrically connected to a humidity sensor (13) installed in the electrical parts storage section (2) is set to operate at a humidity of 75% RH or higher and to stop at a humidity of 60% RH or lower, for example. I'll keep it. In an electrical component storage case installed outdoors, when the temperature drops at night, the outer wall of the case is cooled and the air inside the case is also cooled, so the relative humidity inside the case increases. If left as is, the humidity inside the housing will become supersaturated and condensation will occur. However, in the electrical component storage case according to the present invention, when the relative humidity inside the case exceeds a preset humidity (for example, 75% RH), the control device ft, (14J) connected to the humidity sensor (+3) The signal causes the blower (8) and the electronic cooling element (5) to be in operation.

The electronic cooling element (5) is a DC power supply (no physical damage) (operates in a hurry), and uses a semiconductor (for example, bismuth tellurium B11TeI) that has a large Peltier effect and has a low heat transfer coefficient and resistivity. Therefore, when direct current is applied to the electronic cooling element (5) as described above, the cooling fins (6) connected to the cooling surface of the element are cooled, while the heating fins connected to the heat radiation surface of the element are cooled. (7) is heated.

Now, when the blower (8) moves, the electrical parts storage compartment (2)
The air inside passes through the air intake (9) and enters the dehumidifying air path (3).
The air enters the dehumidifying air path, passes through the air outlet 00), and returns to the electrical component storage section (2), but the air taken into the dehumidifying air path (3) first comes into contact with the cooling fins (6). This cools the air and dehumidifies supersaturated water. The dehumidified air then comes into contact with the heating fins (7) and is heated to become low-humidity air, which is sent back to the electrical parts/wire section (2) by the blower (8). The moisture condensed on the cooling fins (6) is stored in a drain tank (1υ) provided at the bottom of the cooling fins.

The upper part of this drain tank (11) contains a non-volatile liquid (for example, liquid paraffin) that has a lower specific gravity than water. It collects on the side, so it doesn't evaporate again.

Next, when the humidity in the electrical parts storage section (2) decreases to, for example, 60% FtH or less, a signal from the humidity sensor (control device <14 connected to the first stage) sends a signal to the blower (8).
) and the electronic cooling element (5) are in a stopped state. In this way, when the air inside the electrical component storage case becomes high in humidity, it is dehumidified by circulating through the dehumidifying air path, and the humidity is always maintained at a low level. Therefore, there is no corrosion of electrical parts or a decrease in insulation resistance.

FIG. 2 shows another embodiment of the present invention, in which a dehumidifying air path is provided outside the electrical component storage case, and the same reference numerals as in FIG. 1 indicate the same parts. Its operation is also the same as that explained in FIG. This embodiment is suitable for modifying a conventional electrical component storage case that does not have a dehumidifying device to the method of the present invention. Further, FIG. 8 shows yet another embodiment of the present invention, in which heating fins (7) are installed on the side of the electrical component storage section.

As described above, according to the present invention, the air inside the electronic component housing is cooled and dehumidified using an electronic cooling element, and then heated and circulated, so that the air inside the housing is always kept at a low temperature. , no condensation will form inside the housing. In addition, since the dehumidification operation inside the housing is performed within a preset humidity range using a humidity sensor, the consumption is lower than when using a conventional space heater to raise the temperature inside the housing and prevent condensation. The electric power is extremely small, and the control device is engineered, making it highly reliable, and the life of the electronic heating element is much longer than that of a single-heater type. effective.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the invention, and FIGS. 2 and 8 are sectional views showing other embodiments of the invention. In the figure, (1) is an electrical parts storage case, (2) is an electrical parts storage part, (31 is a dehumidifying air path, (6) is an electronic cooling element, (6) is
) is the cooling fin, (7) is the heating fin, (8) is the blower, (9] is the air intake, (10) is the air outlet, (1])
is the drain tank, (1 mark is the humidity sensor, (the river is the control device. In addition, the same symbol in the figure is the same 'f, and the company indicates the corresponding part. Agent Shin Kuzuno - 451 Question 1, Figure 2) Figure 3 456-

Claims (1)

[Claims] (1) A dehumidifying air passage that circulates the air in the electrical parts storage section of the electrical parts storage case, an electronic cooling element installed in this dehumidifying air passage, and a cooling fin connected to the cooling surface of this electronic cooling element. , a heating fin connected to the heat dissipation surface of the electronic cooling element is provided, the air inside the electrical component η and housing is guided to the dehumidifying air path and brought into contact with the cooling fin to cool and dehumidify;
Next, there is an electrical parts storage case (a blower is provided in the dehumidifying air path, a humidity sensor is provided in the electrical parts storage part, a phase in which the electronic cooling element and the blower are configured to be controlled by the signal of the humidity sensor;
An electrical component storage casing according to claim 81. (3) The electrical component storage casing according to claim 1 or 2, further comprising a drain tank at the bottom of the cooling fin.