JPS6145573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for vehicular electrical equipment that cools electrical equipment mounted on a vehicle.

Conventional systems have multiple cooling pipes arranged in parallel through which the cooling medium circulates, so if it snows while the vehicle is parked outdoors, the surface of the cooling fins of the cooling pipes will become clogged with snow. .

If the vehicle starts operating in this state, the electrical equipment will eventually begin to generate heat, and the temperature of the cooling medium sealed inside the cooler will rise, so the temperature of the cooling pipes and cooling fins will gradually rise. do. Therefore, the snow that adheres to the external surface naturally melts, but once the small amount of snow along the surface has melted, this melted area forms an insulating layer of air.

The melted water then flows downward. Alternatively, even if there is a wind barrel and water accumulates there, this water does not contribute to cooling at all because there is no heat transfer with the cooling medium or it is so small that it can be ignored.

In other words, because of the snow on the outer surface, effective running air does not reach the cooling pipes and cooling fins, and their surfaces remain covered with a heat insulating layer of air, causing the internal cooling medium to suffer from temperature rise. continue. As a result, the permissible limit is exceeded, resulting in decreased functionality or damage to the object to be cooled.

The present invention has been made to solve the above-mentioned drawbacks, and provides a cooling device for a vehicle electrical device that can be efficiently cooled by providing a saucer-shaped heat transfer body at the lower part of the cooling pipe.

The figures will be explained below. In Figures 1 and 2, 1 is a vehicle, 2 and 3 are headers fixed to the vehicle 1 at a predetermined interval, and 4 and 5 are cooling units arranged in parallel between both headers 2 and 3. The tube uses the wind from the vehicle to cool the cooling medium that circulates inside. 6 is a cooling fin that is fixed to the cooling pipe 4 to increase the cooling capacity; 7 and 8 are pipes provided in the headers 2 and 3; 9 is a bottom part 9a and a side surface that are in contact with the cooling pipe 5 arranged at the lowest part. It is a saucer-shaped heat transfer body consisting of a portion 9b, and has at least the projected area of the cooling pipes 4 and 5 projected on a horizontal plane. 1
0 is an arrow indicating the traveling direction of the vehicle 1, and the main component of the traveling wind coincides with this direction.

In the above configuration, the cooling medium sent from the heating element (not shown) enters the header 2 through the pipe 7, is cooled through the cooling pipes 4 and 5, and is cooled in the header 3.
, and return to the heating element section again from the pipe 8. Now, if we consider the case where this cooling device freezes, the snow on the external surfaces of the cooling pipes 4, 5 and the cooling fins 6 will melt as the temperature of the internal cooling medium increases, and the falling water will be transferred to the saucer-shaped heat transfer plate. It accumulates at 9. However, since this heat transfer body 9 has high heat transfer with the internal cooling medium, this water ultimately suppresses the temperature rise of the internal cooling medium. In this case, the permissible temperature of the cooling medium is 100
This is especially noticeable when the temperature can be set at ℃ or higher. That is, in this case, when the temperature of the cooling medium reaches 100°C, the accumulated water starts to boil on the surface of the heat transfer body 9 and the cooling pipe 5 because it is under atmospheric pressure, so it exhibits extremely high heat dissipation performance. do.

Further, the evaporated water vapor rises upward and melts the snow adhering to the cooling pipes 4 and cooling fins 6 from below. The melted water then falls onto the heat transfer body 9 again. As a result, the snow gradually melts without the cooling medium exceeding its permissible temperature, so that the traveling wind eventually hits the surfaces of the cooling pipes 4 and 5 and the cooling fins 6.

In the above embodiment, an example of an electrical device that can set the medium at a temperature of 100° C. or higher is a main transformer for a vehicle that uses polyamide insulation and silicone oil. In this case, the continuous temperature rise limit for oil is set at 85°C, so the oil temperature at an ambient temperature of 40°C is
Acceptable up to 125℃.

Note that similar effects can be expected even if the cooling pipes 4 and the cooling fins 6 are brought into contact with the water accumulated in the heat transfer body 9 in the above embodiment.

In addition, in the above embodiment, the side part 9b of the heat transfer body 9 shown in FIG. 2 is removed and the third
By configuring it as shown in the figure, or by bending the side part 9b and fixing it to the support stand 11 as shown in Figure 4, it can be used when the vehicle is stopped and there is no running wind, and also when there is no natural wind. Since it does not obstruct air flow, it is possible to prevent a decrease in self-cooling capacity.

Furthermore, if the configuration is as shown in FIG. 4, the side surface portion 9b can introduce a larger amount of air into the cooling pipe portion during traveling.

The one shown in FIG. 5 is designed to improve the self-cooling capacity without requiring work such as removing or bending the heat transfer body 9 depending on the season.

That is, one or more square or cylindrical pipes are joined to the heat transfer body 9 by welding or the like to form the flow part 9C of the chimney.
The air flows from the bottom surface of the heat transfer body 9 to the circulation section 9C.
so that it passes through and exits upward. Reference numeral 9d denotes a cover joined to the upper end of the flow section 9C, which prevents water dripping during snow melting from flowing down from the flow section 9C and receives it on the upper surface of the heat transfer body 9. Distribution department 9
The height of C is determined within a range that does not reduce the volume of the water reservoir of the heat transfer body 9 too much.

FIG. 6 shows another embodiment in which headers 2 and 3 are arranged side by side and a heat transfer body 12 is provided on the upper surface.
3 are connected by a cooling pipe 4. In this case, since the cooling medium is present in the headers 2 and 3, the snow on the heat transfer body 12 is melted, so that the same effect as in the above embodiment can be expected.

In the above embodiment, the cooling pipes 4 are arranged substantially horizontally, but the same effect can be expected even if they are arranged vertically.

According to this invention, by providing a saucer-shaped heat transfer body at the bottom of the cooling pipe, the water in the heat transfer body is converted into water vapor by the cooling medium in the cooling pipe, and the snow adhering to the cooling pipe is melted. Since the running wind directly hits the cooling pipes and cooling fins, cooling performance can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a sectional view showing the - section of FIG. 1, and FIGS. 3 to 6 are sectional views showing essential parts of other embodiments. It is. In the figure, 1 is a vehicle, 4 and 5 are cooling pipes, and 9 is a heat transfer body. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A cooling pipe in which a plurality of cooling pipes mounted on the roof of a vehicle and through which a cooling medium circulates is arranged in parallel, in contact with the cooling pipe arranged at the lowest position and projected on at least a horizontal plane. A cooling device for electrical equipment for a vehicle, characterized in that a saucer-shaped heat transfer body having a projected area of a plurality of the cooling pipes is provided. 2. The cooling device for vehicle electrical equipment according to claim 1, wherein the cooling medium has an allowable temperature of 100° C. or higher. 3. The cooling device for a vehicle electric device according to claim 1 or 2, wherein the heat transfer body is configured such that the saucer-shaped side portion can be bent downward from the bottom portion. 4. The cooling device for a vehicle electrical device as set forth in claim 1 or 2, wherein the heat transfer body has a chimney-shaped flow section that penetrates through the bottom surface and is open at the top.