JPH0599550A - Electric appliance of boil cooling type - Google Patents

Abstract

PURPOSE:To prevent dielectric breakdown by sinking a foreign object that has a specific gravity larger than that of a cooling medium liquid into a foreign object staying section that consists of a recessed section formed in a connecting pipe when the cooling medium that is cooled and liquefied in a condenser flows down in an evaporation pipe as return liquid from the connecting pipe and returns to the vessel. CONSTITUTION:In a rectifier for an electric railway a rectifying stack 100 that is a heat generating section is received in a vessel 1 and it is sunk in a cooling medium liquid 5. And in the cooling section a plurality of condensers 4 are arranged with a gap of flow passage for the cooling air among them, and the lower section of each condenser 4 is connected by a connecting pipe 30. Further, the bottom section of the connecting pipe 30 and the upper section of the vessel 1 are connected by an evaporation pipe 2. In the above constitution, in the connecting pipe 30 at both sides of the section where the evaporation pipe 2 is connected a recessed section is formed as a foreign object staying section 31. By the way the coolant medium that is cooled and liquefied in the evaporator 2 flows down in the evaporation pipe 2 as return liquid from the connecting pipe 30 and returns to the vessel 1. In this case a foreign object 7 that has specific gravity larger than that of the cooling medium liquid 5 sinks in the foreign object staying section 31 and stays there.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a cooling medium made of carbon fluoride for cooling a heat generating portion and utilizes the heat of vaporization of this cooling medium to perform highly efficient cooling, such as a rectifier for electric railways. The present invention relates to a boiling cooling type electric appliance.

[0002]

2. Description of the Related Art It is well known that DC power supplies for electric railways have a characteristic that the load increases each time a train runs near a substation. Therefore, rectifier transformers and rectifiers for electric railways are manufactured to sufficiently withstand overload. In addition, for the purpose of space saving and maintenance-free of the substation, the rectifier for electric railway adopts the boiling cooling type with high cooling efficiency.

FIG. 3 is a sectional view mainly showing a conventional cooling structure for a railway rectifier. In this figure, a rectifying stack 100 which is a heat generating portion is housed in a container 1 and immersed in a cooling medium liquid 5 made of carbon fluoride. The cooling unit is arranged such that a plurality of flat plate-shaped condensers 4 are separated by a gap such that air for cooling the condensers 4 from the outside can be sufficiently circulated, and lower portions of the condensers 4 are cylindrical horizontal. They are connected by the connecting pipe 3 arranged in 1 to be integrated into one body. The connecting pipe 3 is arranged in the upper part of the container 1, and the central bottom part of the connecting pipe 3 and the upper part of the container 1 are connected by the evaporation pipe 2.

The heat generated by the rectifying stack 100 is transferred to the cooling medium liquid 5, but when the cooling medium liquid 5 reaches the boiling temperature, the temperature does not rise any further and all the generated heat becomes vaporization heat. Generates a large amount of steam. A vapor flow 61 is generated by boiling and becomes a vapor flow 62 passing through the evaporation pipe 2 and enters the connecting pipe 3, and is branched into the condenser 4 and vapor flow 63.
Will rise further. Since the outer surface of the condenser 4 is cooled by air, the cooling medium in a gas state is cooled here, liquefied, and attached to the inner wall of the condenser 4. The liquefied cooling medium travels along the inner wall of the condenser 4, enters the connecting pipe 3, travels along the bottom thereof, travels along the inner wall of the evaporation pipe 2, and returns to the container 1. In this way, the cooling medium is heated from a liquid state to a gas,
The rectifying stack 100 is cooled with high efficiency while circulating such that it is cooled and becomes liquid again.

When the electric railway rectifier is overloaded, the heat generated by the rectifying stack 100 increases in proportion to the square of the load current. However, the cooling medium 5 does not rise above the boiling temperature, but abruptly boils. This is because the boiling cooling system has a high cooling efficiency because it absorbs the heat generated by the heat of vaporization. There is a time lag before the cooling medium vaporized due to overload is liquefied and returns to the container 1 again, and the liquid level of the cooling medium liquid 5 decreases during this time. Even if such a decrease in liquid level occurs, in order to prevent local heating by causing a part of the rectifying stack 100 to be exposed from the liquid surface of the cooling medium liquid 5, the cooling medium is expected in consideration of this decrease in liquid level. Liquid 5
You can put a lot of.

[0006]

By the way, if the foreign matter 7 adheres to the condenser 4, when the liquefied cooling medium mentioned above flows down along the inner surface of the condenser 4, the foreign matter 7 also flows along with it. There is a risk that the leveraged foreign matter will enter the container 1. Since the rectifying stack 100 has a high voltage portion, the foreign matter 7 may cause dielectric breakdown. For this reason, a cleaning step for cleaning the inside of the condenser 4 and the connecting pipe 3 before the whole assembly is performed so as to avoid the above-mentioned fear. However, even if it is thoroughly cleaned, it is not always possible to expect completeness, and foreign matter may remain, and it is also difficult to confirm this. There is a possibility that it will be a factor.

An object of the present invention is to solve such a problem and to provide a boiling cooling type electric device in which even if foreign matter remains in the condenser 4, the foreign matter does not enter the container 1. ..

[0008]

In order to solve the above-mentioned problems, according to the present invention, a container for accommodating a heat-generating portion and a cooling medium liquid for cooling the heat-generating portion and a predetermined gap in the horizontal direction are provided. A plurality of flat plate-shaped condensers arranged horizontally, a connecting pipe arranged horizontally and communicating with the condenser, and an evaporative cooling type electric device equipped with an evaporation pipe communicating the central bottom of the connecting pipe with the container upper part. In the above, it is assumed that the bottom of the connecting pipe on both sides of the position where the evaporation pipe communicates is provided with a foreign matter reservoir formed of a recess, or the evaporation pipe is projected inside the connecting pipe.

[0009]

In the structure of the present invention, the liquefied cooling medium mixes the foreign matters with the liquefied cooling medium by forming the concave portions as the foreign matter reservoirs at the bottoms on both sides of the position where the evaporation tubes of the connecting pipe communicate with each other. When it came to the pipe,
The foreign matter enters the foreign matter reservoir and stays there, and does not reach the evaporation tube. Further, instead of providing the concave portion, the evaporation pipe is projected into the connecting pipe, and the projection portion blocks foreign matter so as not to enter the evaporation pipe.

[0010]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view mainly showing a cooling structure for a railway rectifier according to an embodiment of the present invention. The same members as those in FIG. 3 are designated by common reference numerals and detailed description thereof will be omitted. In this figure,
Recesses are provided as foreign matter reservoirs 31 on both sides of the position of the connecting pipe 30 to which the evaporation pipe 2 is connected. The cooling medium cooled and liquefied by the condenser 4 flows down as a return liquid 51, enters the connecting pipe 30, further horizontally toward the evaporation pipe 2, enters the evaporation pipe 2, and returns to the container 1. At that time, the foreign matter collecting portion 31
The foreign matter 7 having a larger specific gravity than that of the cooling medium 5 sinks into the foreign matter collecting portion 31 and does not enter the evaporation pipe 2 when flowing over the cooling medium 5. Therefore, there is no risk of foreign matter entering the container 1 and causing dielectric breakdown in the rectifying stack 100. As described above, since the condenser 4 prevents foreign matter from remaining by cleaning, even if foreign matter remains, the amount thereof is very small, so that the foreign matter overflows from the foreign matter reservoir 31. There is no such thing.

FIG. 2 is a partial cross-sectional view mainly showing a cooling structure for a railway rectifier according to another embodiment of the present invention. The same members as those in FIG. 3 are designated by common reference numerals and detailed description thereof will be omitted. In this figure, a configuration is adopted in which a portion of the evaporation pipe 20 that communicates with the connecting pipe 32 is made to protrude inside the connecting pipe 32 to form a protruding portion 21. As compared with the connecting portion between the evaporation pipe 2 and the connecting pipe 3 shown in FIG. 3, the position is slightly lowered, and therefore the manufacturing is easy. Instead, since the cooling medium liquid 5 is accumulated in the connecting pipe 32 by the protruding size of the protruding portion 21, the usage amount of the cooling medium liquid 5 is increased and the utilization cross-sectional area of the connecting pipe 32 is reduced. There is a drawback that On the other hand, in the case of the embodiment shown in FIG. 1, the number of manufacturing steps for providing the foreign matter reservoir 31 is larger than that in FIG. 2, but there is no drawback as shown in FIG. However, as described above, since the amount of the foreign matter 7 is very small, the projecting portion 21 may have a small projecting dimension, so that the disadvantage of the embodiment of FIG. 2 is not so large.

Even if the foreign matter 7 remains, there is no risk of it entering the container 1, and therefore a slight amount of foreign matter may remain, so that the washing process of the condenser 4 can be simplified and the working time can be shortened. Is.

[0013]

As described above, according to the present invention, the liquefied cooling medium carries foreign matters to the inside of the coupling tube by providing recesses as the foreign matter collecting portions at the bottoms on both sides of the position of the coupling tube to which the evaporation pipe is connected. When flowing toward the evaporator tube, the foreign matter enters and stays in the foreign matter reservoir and does not reach the evaporator tube.
As a result, even if a small amount of foreign matter remains in the condensing pipe, it will not enter the container, so there is no danger of dielectric breakdown due to foreign matter, and the effect of contributing to the improvement of the reliability of the boiling cooling type electric appliance can be achieved. can get. Furthermore, even if a small amount of foreign matter remains in the condenser, there is no problem, so that the washing process of the condenser can be simplified and the working time can be shortened. Further, instead of the concave portion serving as the foreign matter reservoir, the concave portion is provided even if the evaporation pipe is projected into the connecting pipe and the protruding portion blocks the foreign matter to prevent the foreign matter from entering the evaporation pipe. The same effect as that of can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view mainly showing a cooling structure for a railway rectifier according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view mainly showing a cooling structure for a railway rectifier according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view mainly showing a conventional cooling structure of a railway rectifier.

[Explanation of symbols]

 1 Container 100 Rectifying Stack (Heating Part) 2 Evaporation Pipe 20 Evaporation Pipe 21 Projection 3 Connection Pipe 30 Connection Pipe 31 Foreign Material Reservoir 32 Connection Pipe 4 Condenser 5 Cooling Medium Liquid 51 Return Liquid 61 Steam Flow 62 Steam Flow 63 Steam Flow 7 Foreign body 71 Foreign body

Claims (2)

[Claims] 1. A container for accommodating a heat-generating part and a cooling medium liquid for cooling the heat-generating part, a plurality of flat plate-shaped condensers horizontally arranged with a predetermined gap therebetween, and the condenser arranged horizontally. In a boiling cooling type electric appliance including a connecting pipe that communicates with each other and an evaporation pipe that communicates the center bottom portion of the connecting pipe with the upper portion of the container, a foreign substance formed as a concave portion on both sides of the position where the evaporation pipe communicates. A boiling cooling type electric appliance having a reservoir. 2. A container for accommodating a heat-generating part and a cooling medium liquid for cooling the heat-generating part, a plurality of flat plate-shaped condensers arranged horizontally with a predetermined gap therebetween, and the condenser arranged horizontally. In a boiling cooling type electric device having a connecting pipe for communicating the reactor and an evaporator pipe for communicating the central bottom of the connecting pipe with the upper portion of the container, the evaporator pipe is protruded into the inside of the connecting pipe. Boiling cooling type electric appliance.