JPH0296400A - High electric resistance cooling device - Google Patents

Abstract

PURPOSE:To cool an equipment, to which high voltage is applied, directly by normal city water by providing a means for giving fixed quantities of gases into the pipes of a water supply pipe and a water return pipe. CONSTITUTION:A means 5 for giving fixed quantities of gases into the pipes of a water supply pipe 6a and a water return pipe 6b is provided. Since fixed quantities of gases are contained in the pipes of the water supply pipe 6a and the water return pipe 6b, cooling water in each pipe can be separated completely by the gases, and the insulation resistance value of cooling water is elevated extremely. Accordingly, even when normal city water is used as cooling water, insulation resistance between an equipment such as a particle accelerator and the ground can be ensured sufficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for cooling equipment to which a high voltage is applied, such as a particle accelerator.

<Prior art> A high voltage is applied to a particle accelerator, and cooling such a particle accelerator directly with ordinary tap water would result in insufficient insulation resistance between the particle accelerator and the ground. It is very difficult to do so.

Therefore, conventionally, a primary cooling system for cooling the particle accelerator using a high electrical resistance refrigerant and a secondary cooling system for cooling the secondary cooling system using tap water have been provided.

An example of its configuration is shown in FIG.

- The pipe lines of the primary and secondary cooling water systems A and B are both closed circuits. - The secondary cooling system A supplies a high electrical resistance refrigerant such as pure water, Freon, or oil to the inlet of the refrigerant path 2 formed inside the electrode 1a of the particle accelerator 1 by means of a circulation pump 103, and a heat exchanger 105. The refrigerant that has taken heat inside the particle accelerator 1 is guided through the pump 103.
Return to.

In the secondary cooling system B, ordinary tap water is used as a refrigerant, and the tap water is cooled by a cooling tower 4, and the cooling water is guided to a heat exchanger 105 by a circulation pump 3. The refrigerant of the primary cooling system A passing through the heat exchanger 105 is cooled, and the cooling water that has passed through the heat exchanger 105 returns to the cooling tower 4.

<Problems to be Solved by the Invention> By the way, according to the above-mentioned configuration, since two cooling systems, the secondary and the secondary, are provided, the entire cooling device is complicated, and
Not only is it expensive, but since a special refrigerant is used in the secondary cooling system, for example, if pure water is used as the refrigerant, an ion exchanger shown in Figure 4 must be used for 10 days to maintain its purity. It is also necessary to take measures to maintain the insulation resistance value of the refrigerant in the secondary cooling system.

Here, one method of cooling particle accelerators etc. with one cooling system is to use air as a refrigerant, but air has a small specific heat and has poor cooling efficiency, so it requires a large capacity pump compared to water etc. Not only is this necessary, but there is also the problem that it cannot handle large cooling loads.

An object of the present invention is to provide a cooling device that can directly cool equipment to which a high voltage is applied using ordinary tap water.

Means for Solving the Problems> The configuration for achieving the above objects will be explained with reference to FIG. 1 corresponding to the embodiment. 1, a water supply pipe 6a and a water return pipe 6b made of an insulating material and communicating with the water inlet and outlet 2a and 2b of the cooling waterway 2, respectively, and a water cooling means (for example, a cooling tower 4). a pump 3 for supplying the cooling water cooled by the cooling water to the water inlet 2a of the cooling water channel 2 via the water supply pipe 6a;
The water supply pipe 6a and the water return pipe 6b are characterized by being equipped with means (for example, a bubble mixer 5) for making a predetermined amount of gas exist within the water supply pipe 6a and the water return pipe 6b.

<Function> By allowing a predetermined amount of gas to exist in the water supply pipe 6a and the water return pipe 6b, it is possible to completely separate the cooling water in each pipe by the gas. The insulation resistance value becomes extremely high. Therefore,
Even if ordinary tap water is used as cooling water, it is possible to ensure sufficient insulation resistance between equipment such as a particle accelerator and the earth.

<Example> Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and shows an example in which the present invention is applied to a particle accelerator.

The particle accelerator 1 is connected to a high voltage power source (not shown) for supplying a driving voltage, and the entire particle accelerator 1 is insulated from the high voltage. A cooling water channel 2 is formed within the accelerating electrode 1a of the particle accelerator 1 in order to maintain the electrode 1a at a permissible temperature or lower.

On the other hand, on the ground side, a cooling tower 4 and a circulation pump 3 are arranged, and the suction port of the circulation pump 3 communicates with the water tank of the cooling tower 4 via a communication pipe 6C.

The cooling water supply pipe 6a that communicates with the discharge port of the circulation pump 3 is branched into three directions, one of which is connected to the water inlet 2a of the cooling channel 2 of the particle accelerator 1, and the other is connected to the outlet of the accumulator 51 of the bubble mixer 5. 51a, respectively.

The water sprinkling port of the Kurig tower 4 communicates with the water outlet 2b of the cooling water channel 2 of the particle accelerator 1 via a cooling water return pipe 6b, and the cooling water return pipe 6b and the above-mentioned cooling water supply pipe 6a , both use tubes made of insulating materials with high insulation resistance values, such as Teflon tubes.

A spherical pressure accumulation chamber 51b is formed inside the accumulator 51 and communicates with the outlet 51a via a chatty valve 51c, and a compressed air supply source (
Compressed air is supplied from a source (not shown) via a variable throttle valve 52.

To explain the operation of such an accumulator 51,
The internal pressure of the pressure accumulation chamber 51b is increased by the compressed air, and when the pressure reaches the water pressure in the cooling water supply pipe 6a or higher, the check valve 51c opens, and the air in the pressure accumulation chamber 51b is supplied to the cooling water supply pipe 6.
The internal pressure of the pressure accumulating chamber 51b decreases as it flows into the interior of the pressure accumulating chamber 51b. Then, when the internal pressure of the pressure accumulation chamber 51b becomes lower than the water pressure in the cooling water supply pipe 6a, the check valve 51c closes, and the pressure accumulation chamber 51
The internal pressure of b rises again. The above operations are repeated in sequence, and air bubbles are intermittently inserted into the cooling water supply pipe 6a. Here, the size of the bubbles is such that the bubbles contact the entire circumference of the inner wall surface of the cooling water supply pipe 6a, that is, the size is such that the bubbles completely separate the cooling water in the cooling water supply pipe 6a. The variable throttle valve 52 is necessary so that bubbles of such a size are inserted into the cooling water supply pipe 6a.
Make adjustments.

Next, we will discuss the effect. First, ordinary tap water is used as cooling water, and the tap water is filled into the cooling channel 2 of the particle accelerator 1, the water tank of the cooling tower 4, and the piping system.

When the circulation pump 3 is driven in this state, the water stored in the water tank of the cooling tower 4 passes through the cooling channel 2 of the particle accelerator 1, returns to the cooling tower 4, is ejected from the water spout, and is stored in the water tank again. . The cooling water circulated in this manner absorbs heat from the accelerating electrode 1a when passing through the cooling water channel 2 of the particle accelerator 1, and then is cooled by the cooling tower 4 and passes through the cooling water channel 2 again. As a result, the accelerating electrode 1a of the particle accelerator 1 is cooled. In addition, air bubbles are intermittently inserted into the cooling water by the air bubble mixer 5 in the middle of the cooling water supply pipe 6a, and the air bubbles move sequentially as the cooling water circulates, and are transferred to the cooling water channel 2 and the cooling water return. Cooling tower 4 via pipe 6b
reach. That is, bubbles always exist within the cooling water supply pipe 6a and the cooling water return pipe 6b. Note that the air bubbles are released into the atmosphere in the cooling tower 4.

Here, an experimental example regarding the insulation resistance value of tap water into which air bubbles have been inserted will be explained with reference to FIG.

A Teflon tube with an inner diameter of 411 mm and a length of 500 mm was filled with tap water, and the resistance between the metal plugs b and b2 at both ends was measured using an lkv insulation resistance tester (commonly known as megger) C, and then the Teflon tube a A similar measurement was carried out by inserting an air bubble approximately 10 dragons wide in the center of the tube. As a result, in the former case, the insulation resistance value was about 4Ω,
It has been found that in the latter case, an insulation resistance value of 2000 MΩ or more can be obtained. As is clear from the results of this experiment, by completely separating the tap water in the pipe with air bubbles, the insulation resistance value becomes extremely high. Therefore, by providing air bubbles in the cooling water supply pipe 6a and the cooling water return pipe 6b, sufficient insulation resistance can be ensured between the particle accelerator 1 and the ground-side circulation pump 3 and cooling tower 4.

If the cooling waterways of the equipment to be cooled are complex and there is a risk that air bubbles may accumulate in the cooling waterways, in addition to the configuration of the above embodiment, a steam separator may be installed at the water inlet of the cooling waterways. If a bubble mixer is further provided at the water outlet, it is possible to prevent bubbles from entering the cooling waterway.

In addition, instead of the configuration of the air bubble mixer 5, the cooling water supply pipe 6a
A trap as shown in Figure 3 is formed in a part of the trap, air bubbles are trapped at the top of the trap, and cooling water is intermittently circulated in an amount that does not allow the air bubbles to exceed the bottom of the trap. You may. However, in this case, a similar trap is also required for the cooling water return pipe 6b.

Although an example in which the present invention is applied to a particle accelerator has been described above, the present invention is not limited to this, and can be applied to any other equipment such as an electron tube oscillator for high-frequency heating.

It goes without saying that the present invention can also be applied to a heating device that heats equipment to a predetermined temperature.

<Effects of the Invention> As explained above, according to the present invention, a predetermined amount of gas is present in the water supply pipe and the water return pipe that communicate with the water inlet and outlet of the cooling channel formed in the equipment, respectively. This makes it possible to make the insulation resistance of the cooling water extremely high even when using regular tap water as cooling water, making it possible to use special refrigerants such as pure water in high-potential equipment. As a result, the entire device can be simplified and the cost of the device can be reduced.

Here, according to the present invention, by inserting air bubbles into the cooling water piping, it is possible to increase the insulation resistance value of the cooling water. In equipment that uses water to cool equipment,
In the past, in order to ensure sufficient insulation resistance, cooling water piping was made longer than necessary to circulate the cooling water, but now the length of the piping has been shortened to the minimum necessary. It also has the effect of making it possible.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a diagram for explaining the operation, Fig. 3 is a diagram for explaining another embodiment of the present invention, and Fig. 4 is a diagram for explaining another embodiment of the present invention.
The figure is a diagram showing a general configuration example of a high electrical resistance cooling device. 1...Particle accelerator 1a...Acceleration electrode 2...Cooling channel 2a...Water inlet 2b...Water outlet 3...Circulation pump 4...Cooling tower 5...Bubble mixer 6a... ...Cooling water supply pipe 6b...Cooling water return pipe

Claims (1)

[Claims] A device for cooling equipment to which high voltage is applied, including a cooling channel formed in the equipment to be cooled, and a water supply pipe and water return made of an insulating material that communicate with the water inlet and outlet of the cooling channel, respectively. a pump for supplying cooling water cooled by the water cooling means to the water inlet of the cooling waterway through the water supply pipe, and a predetermined amount of gas in the water supply pipe and the water return pipe. A high electrical resistance cooling device characterized by comprising means for causing the presence of.