KR102257483B1 - Humidity Proof System of Electric Control Box - Google Patents

Abstract

In the summer rainy season, the electric control box in a place such as an underground parking facility stops due to condensation. In the process of discharging the upper ventilator fan to the outside in order to discharge the hot heat inside the electric control box, moisture from outside flows into the electric control box through the inlet at the lower part, resulting in condensation. This problem is improved by utilizing the existing method. In addition, by mobilizing the separation by space and time described in TRIZ, this problem is fundamentally solved with a much simpler composition and idea.
① As in the existing method, moisture is removed by introducing cold wind from the outside through a dehumidifying agent such as activated carbon, and the air around the hot internal electronic products is discharged to the outside, but the dehumidifying agent such as activated carbon is dried at the outlet. Conversely, it can be solved by repeating the method of changing the direction of the wind in the opposite direction so that external cold wind is introduced through a dehumidifying agent such as activated carbon at the outlet.
② In this case, in order to cool the hot internal electronic product, it is not a method of directly blowing the external cold wind, but passing the external cold wind through an intermediate medium such as a hose, which is arranged over a wide range around the hot internal electronic product. By doing so, it cools the air around hot electronics. This indirectly cools the hot internal electronics as a result. Therefore, it fundamentally blocks external moisture from directly accessing the internal electronic products.
③ Otherwise, it detects in advance that the relative humidity of the outside is high and automatically stops the cooling fan that introduces the outside air, allowing only air circulation due to natural convection. Accordingly, not only does it prevent the inflow of external moisture actively, but also decreases the relative humidity due to the increase in the internal temperature due to the heat of the hot internal electronic product, and consequently prevents condensation due to moisture, thereby stopping the internal electronic product Solve the problem.

Description

Electricity-control-box-moisture-prevention-system {Humidity Proof System of Electric Control Box}

If the electric control box has a large capacity, it generates heat inside. So, I put a fan at the top and an air hole at the bottom. However, during the summer rainy season, moisture flows in and breaks down. The present application relates to a technology for'removing','blocking' or'reducing' such moisture.

In a high temperature and high humidity environment, moisture causes an electrical device to short circuit. Automobile engines also emit fumes due to incomplete combustion when moisture enters. Moisture'removal' technology is already known, but its'blocking' or'reduction' technology is not known or has not yet been applied to this moisture control technology field.

Patent Publication No. 10-2018-0024143 (published date 201838, ventilation and cooling control system for battleships) is a technology to which a'dehumidifier' for removing moisture from entering battleships has been added. Patent registration number 10-0443992 (announcement date 2004812, a moisture removal device for inlet air that removes moisture contained in the air entering the vehicle's internal combustion engine), selectively connects two moisture removal tanks to the inlet and outlet. do. When connected to the intake port, the activated carbon in the tank absorbs the moisture of the inlet air, and when the activated carbon exceeds the absorption capacity, the absorbed and accumulated moisture is dried and removed by connecting the tank to the outlet. There are other CN 206061328(U)(2017-03-29, Novel electrical control cabinet) and CN 105283043(B)(2018-03-02, Outdoor communication cabinet with good moisture-proof and radiating performance), but the composition is complicated. It is not worth using.

Not applicable

In addition to improving the technology of'removing' the moisture inflow, it is devised a technology that'blocks' or'reduces' the moisture inflow itself from the beginning to eliminate the side effects.

First of all, by selectively repeatedly operating two activated carbon-connected ventilation fans, one absorbs incoming moisture and the other dries up absorbed and accumulated moisture. The existing technology is improved and applied.

Alternatively, secondly, a corrugated hose connected from the inlet air hole to the ventilator discharge hole is disposed to pass through the inside of the electric control box, and the internal heat is cooled in the process of passing the external inlet air through the corrugated hose. It is solved by separation by space. External incoming moisture exists only in the corrugated hose and has no effect inside the control box.

In addition, thirdly, in the case of the summer rainy season, when the relative humidity exceeds a certain level, the operation of the ventilation fan is stopped, thereby allowing external inflow air to enter only by convection. It is to apply separation by time. If the temperature drops due to rain, the temperature inside the control box does not reach the dangerous level, so it is sufficient to cool it only by relying on the natural convection action without having to operate the ventilator. And since the internal temperature only depends on the natural convection action, the dew point increases because the dew point increases more moderately than the external temperature, and there are no side effects such as short circuit due to moisture.

The incoming moisture is'removed' by selectively repeatedly operating the two activated carbon-connected fans. As external inlet air passes through the corrugated hose, it fundamentally'blocks' the moisture inflow into the box. When the humidity exceeds a certain level, the ventilation fan is stopped, so that side effects due to moisture are fundamentally'reduced' due to the inflow of'a small amount' of moisture due to natural convection and the'rise of dew point' according to an appropriate temperature rise.

1 is a view of an opened electrical control box
2 is an explanatory diagram of heat generation of internal parts of an electric control box
3 is a view of a closed electrical control box
4 is a drawing of Patent Publication No. 10-2018-0024143 (published date 201838, ventilation and cooling control system for battleships)
5 is a view of Patent Registration No. 10-0443992 (announcement date 2004812, a moisture removal device for inlet air that removes moisture contained in the air entering the internal combustion engine of a vehicle)
6 is a diagram for selectively repeatedly operating two activated carbon-connected ventilation fans
7 is a conceptual diagram showing the addition of a corrugated hose between the inlet air hole and the exhaust fan outlet hole, or a conceptual diagram of stopping the ventilation fan when the relative humidity is exceeded in the summer rainy season
8 is a diagram illustrating the relationship between temperature and saturated humidity.
9 is a collection diagram of an actual embodiment of an additional configuration of a corrugated hose between an inlet air hole and a ventilator discharge hole

Referring to Figures 1 (opened electrical control box diagram), Figure 2 (heat generation guide diagram of the internal parts of the electrical control box), and Figure 3 (closed electrical control box diagram), the air introduced through the lower external inlet air hole is the control box. While cooling the internal heat generating parts, it is discharged to the outside by the rotation of the fan of the upper ventilator.

As in the description of the task to be solved earlier, in the case of the summer rainy season, the parts inside the electric control box cause a short circuit due to moisture. Automobile engines also emit fumes due to incomplete combustion when moisture enters.

In the preceding patent documents, a'dehumidifier' for removing inflow moisture is added (see FIG. 4), or two moisture removal tanks are selectively connected to the inlet and outlet of the engine (see FIG. 5) to remove inflow moisture. . However, this configuration is complex and difficult to implement.

As shown in FIG. 4, without adding a dehumidifier and without adding complex valves and sensors as shown in FIG. 5, the configuration shown in FIG. 5 can be improved and applied.

Example 1

As shown in FIG. 6, the activated carbon filters or the zeolite filters, which are moisture adsorption materials, are connected to the two ventilators, respectively, and the two activated carbon-connected ventilators are alternately operated repeatedly.

Since the moisture absorption limit capacity of carbon filters or zeolite filters (Ammonia-X filters) is already determined, it is not necessary to detect when the limit capacity is reached through a sensor. Before reaching the limit capacity, the two activated carbon-connected ventilators are allowed to operate interchangeably. If one is absorbing moisture, the other is to dry the absorbed accumulated moisture. It is to dry the absorbed and accumulated moisture by using the heated air while passing through the inside of the control box. The air that has passed through the inside of the control box has already been removed from moisture and is in a state of being heated by the heat of the internal parts, so it dries the absorbed and accumulated moisture at a much faster rate than absorbing the moisture.

For example, in Fig. 6, when the air enters the case through the above air-hole at time T1, the air enters the moisture adsorption filter while taking away moisture, and passes through the middle of the case to the other side, that is, the other air- The hole, in other words, is heated by the heat inside the case in the process of reaching the bottom air-hole.

In this way, even though the moisture has already been taken away, the heated internal air reaches the other side, that is, the other air-hole, that is, the lower air-hole, and at the end, it is discharged by the rotation of the fan. -Holes, that is, the moisture adsorption filter in the air-holes below it to dry.

At time T2, it now starts from the lower air-hole and reaches the upper air-hole, that is, the other air-hole on the opposite side, and is discharged in the same way. When the T1 hour comes again, it is discharged in the manner of the T1 hour previously seen.

In this way, T1 time passes and T2 time becomes T1 time, and the wind direction of the air-hole is reversed by alternating T1 and T2, such as T1, T2, T1, T2, ... Changes in direction.

Example 2

As shown in the left figure of FIG. 7, a corrugated hose between the inlet air hole and the ventilator outlet hole may be disposed inside the electric control box.

When the corrugated hose disposed inside the electric control box is heated by receiving heat from the inner part of the control box, the outside air penetrating through the corrugated hose cools, so that the inside of the electric control box can be indirectly cooled. A hot radiator does not warm the surroundings, but a relatively cold outside air passes through it, so that the cold radiator cools the surroundings.

For example, in Figure 7 From the left The hose, starting from the inlet air-hole at the bottom, passes through the inside of the control box, i.e. inside the case, and is connected to the exhaust air-hole at the top. As shown in Fig. 9, a corrugated hose that is effective for heat transfer is good.

While external air passes through the hose inside the case and absorbs the hot heat inside the case by heat transfer, it is finally discharged through the exhaust air-hole in the upper part by the operation of the fan installed in the motor.

It is to apply the spatial separation principle of TRIZ. To solve the problem, by separating the problem situation spatially, that is, by separating the passage through which moisture passes, the problem is solved by separating it altogether.

The corrugated hose not only serves as a passage for outside air, but also serves to separate the outside air from the inside of the electric control box.

As shown in the figure below, it corresponds to extraction among the 40 principles of invention. If the temperature increases on the vertical axis, but harm occurs on the horizontal axis, one of the solutions is extraction, which is applied.

In addition, as shown in the figure below, according to the TRIZ standard 1-2-1, an aluminum corrugated tube, a 3rd substance, is intervened to block harmful actions and ensure that only beneficial actions reach the product. It also applied a solution that applies the principle of doing things. The problem was solved by setting up a 3rd substance, an aluminum corrugated tube, to replace the OZ (Operational Zone) as an analysis target in TRIZ.

Example 3

As shown in the right figure of FIG. 7, even when the operation of the ventilation fan is completely stopped when the relative humidity in the summer rainy season is high, moisture can be fundamentally reduced.

As explained in the solution to the previous problem, if the temperature drops due to rain, the temperature inside the control box does not reach a dangerous level, so it is sufficient to cool it only by relying on the natural convection action without having to operate the ventilator to cool it. And since the internal temperature only depends on the natural convection action, the dew point increases because the dew point increases more moderately than the external temperature, and there are no side effects such as short circuit due to moisture.

This dew point description is shown in FIG. 8. At 28 degrees, dew forms, but at 29 degrees, the dew point rises and dew does not form. Therefore, by cooling only by convection, you can just leave it so that the internal temperature is over 29 degrees, that is, there is no need to operate the fan. However, if it gets too hot like 35 degrees or 40 degrees, that is, after rain has cleared, When the day gets hot again, it is only then that the fan can be turned on again. In order to distinguish this, a relative humidity detection switch may be further provided to turn on and off the ventilation fan according to external relative humidity. Through the root cause analysis (RCA) of TRIZ, the above concept was differentiated.

For example, in Figure 7 From the right , In T1 hours when the external relative humidity is low, the air entering the lower air-hole by natural convection is cooled as it exits the upper exhaust air-hole, and the fan installed in the motor is operated only during T2 hours when the external relative humidity is high. .

In patent application No. 10-2018-43666 filed earlier by the applicant of the present application, Root Cause Analysis (RCA), component-trimming, small dwarf technique [MMD (Modeling with Miniature Dwarfs), SLP ( Smart Little People)], the medium C is the ventilation fan, which must be turned on at some time and off at other times.

Separation by the liver revealed that this problem was solved.

As shown in the figure below, we see the physical and technical contradiction that the medium C must transfer heat to absorb heat from the inner panel, but the medium C must not transfer heat in order not to diffuse external moisture. The physical contradiction that should or should not be transferred to the heat must be converted into a technical contradiction to absorb the heat of the panel, while the moisture must not diffuse.

In order to solve the above contradiction, the component-trimming process of TRIZ and small dwarf techniques (MMD, SLP) were applied as follows.

Through the component-trimming process as shown in the following figure, it was revealed that the subject of trimming was the composition of the ventilator as a medium called C, and this component could be intensively analyzed. The ventilator was designated as an X-element when finding OT (Operational Time) as an analysis target in TRIZ.

Through the small dwarf technique (MMD, SLP) as shown in the following figure, the entire components were personified and expressed. It is a schematic diagram of the process of seeing the air coming in from the outside as a small dwarf and bringing the dwarf to the inside by burying the outside moisture. If the fan is not turned on on a rainy day, the small dwarfs (outside air) will slowly warm up and pass through, maintaining a very small number. Therefore, since there are only a few small dwarfs (external air), it has been found that not only is there less external moisture they are buried in, but also moves slowly, resulting in much less dew condensation as the dew point rises.

Not applicable

Claims (1)

Electric control box case, internal control panel, inlet air-hole, exhaust air-hole, exhaust motor, including a fan installed in the exhaust motor, starting from the inlet air-hole and connected to the exhaust air-hole, and the electrical control An electric control box moisture prevention system, characterized in that external air passes through the hose disposed inside the box and is finally discharged to the outside by the fan operation.

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