JPS6120777Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water circulation type cooling device for electrical equipment, mainly semiconductor rectifiers.

For a large-capacity DC power supply composed of two or more rectifiers, a redundant system is adopted in which a rated output is supplied by parallel operation of n-1 rectifiers, and one rectifier is kept as a standby. In this case, it is usual that n rectifier coolers are also provided in a one-to-one relationship.

Figure 1 shows the cooling system in this case.
1 is n rectifiers operated in parallel, 12 is an air-cooled circulating water cooler corresponding to each rectifier, 13 is a cooling fan for this water cooler 12, 14 is a water circulation pump for each water cooler, and 15 is a surge tank.

In a rectifier system with one or more spare rectifiers, if one that uses an air-cooled water cooler is installed in a cold region, the circulating water of the standby rectifier that is out of operation will freeze. There is a risk that this will occur. This is because the circulating water is frozen by the water cooler's self-cooling capacity due to the low temperature in the cold region. For this reason, when stopping the operation of a rectifier, conventional measures have been taken such as draining the circulating water for cooling from the rectifier that is out of operation or surrounding the entire water cooler with a material that has a high heat insulation effect.

The object of the present invention is to provide a water cooling device for electrical equipment that does not require such measures.

An embodiment of the present invention in which two rectifiers are used will be described below with reference to FIG. 2. Parts in FIG. 2 that are the same as those in FIG. In the present invention, one surge tank 20 having two inlets and two outlets is provided, and this is piped to a circulation waterway that can be shared by each water cooler 12.

Next, the operation in the above configuration will be explained. now,
In FIG. 2, it is assumed that the rectifier 11a is in an operating state and the rectifier 11b is in a resting state. Here, if each water circulation pump 14a, 14b is left in operation, the water flows as shown by arrows A and B. Then, the rectifier 11a in operation becomes a heat generation source,
This amount of heat is absorbed by the circulating water A, and the temperature of the circulating water A increases by the amount of heat. Since the circulating water A whose temperature has increased and the circulating water B supplied by the water circulation pump 14b are mixed in the surge tank 20, the temperature of the circulating water of the rectifier 11b that is not in use increases by the amount of heat generated by the mixing, so it freezes. It becomes possible to prevent In this embodiment, one surge tank is shared by two water coolers, but it may be shared by two or more water coolers.

As described above, in this invention, one surge tank is shared by two or more water coolers, and the circulating water of each cooler is mixed within the surge tank, so it is not necessary to drain the circulating water. It is possible to provide a water cooling device for electrical equipment that can prevent a cooler from freezing while it is out of service without having to take special measures such as surrounding it with a material having a high heat insulation effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a cooling water channel system when multiple rectifiers operated in parallel are each provided with an air-cooled water cooler, and FIG. 2 is a diagram showing a cooling water channel system according to an embodiment of the present invention. FIG. 2 is a diagram showing a cooling water channel system according to an embodiment of the present invention. 11, 11a, 11b... Rectifier, 12, 12
a, 12b...Air-cooled water circulating water cooler, 13, 1
3a, 13b...cooling fan, 14, 14a,
14b...Water circulation pump, 15, 15a, 15
b...Surge tank.

Claims (1)

[Scope of utility model registration request] It has a plurality of wind-cooled water coolers that independently cool a plurality of electrical equipment, and at least one of the electrical equipment is for backup, and this backup electrical equipment can be used in case of emergency. In the case where the air-cooled water cooler is not operated and is used in a place where the water in the air-cooled water cooler freezes, one surge tank is shared by each of the air-cooled water coolers, and each of the air-cooled water coolers is A water cooling device for electrical equipment, wherein circulating water of the water cooler is mixed in the surge tank to prevent water in the air-cooled water cooler from freezing.