JPH02197778A - Cooling device - Google Patents

Abstract

PURPOSE:To relax the transient change of the temperature of fluid to be cooled which is fed to a device during the starting and the stop of a compressor by a method wherein when the compressor is started, a blast amount of a fan is temporarily decreased, and when the compressor is to be stopped, a blast amount of a fan is temporarily increased. CONSTITUTION:A cooling device is provided with a cooling tower 1 having a heat transfer pipe 2 and a fan 3 to feed blast to a the heat transfer pipe, a chiller 10 having a compressor 11, a condenser 12, an expansion valve 13, and a vaporizer 14, and a refrigerant circulating therethrough, and a line through which, after fluid to be cooled returned from a device 20 to be cooled is guided in order of the cooling tower 1 and the vaporizer 14, it is fed to the device 20. In this cooling device, when the compressor 11 is started or stopped, the temperature of a temperature detector 23 is transiently sharply decreased or increased, and is inconvenient to cooling of a precision device. In which case, when the compressor 11 is started, a blast amount of the fan 3 is temporarily decreased in linkage with the starting of the compressor, and when stopped, control is effected so that the blast amount is increased. This constitution improves transient characteristics of the outlet temperature of the vaporizer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooling device that cools a cooled fluid returning from a device to be cooled and then sends the cooled fluid to the device. The present invention relates to a cooling device that alleviates transient changes in temperature.

[Conventional technology 1 Production lines and research facilities for precision instruments require cooling water with a stable temperature close to the room temperature of the air conditioner. Conventionally, closed cooling towers and compression chillers have been used as cooling devices for sending water to equipment. With these cooling systems, for example, closed cooling towers can only cool the fluid to a temperature of about 30°C at most in the summer, and cannot cool the fluid to be cooled to a lower temperature than that required for precision equipment. There was a problem. In addition, compression type chillers are cooled to a temperature of about 7 to 17 degrees Celsius, which is unfavorable in terms of quality control as condensation tends to occur due to proper cooling.Also, it is difficult to maintain a constant temperature of the fluid to be cooled, which poses problems in maintaining dimensional accuracy. 6. Therefore, as a cooling device that can maintain a constant temperature in the medium-low temperature range of about 18 to 29 degrees Celsius, we have developed an air-cooled cooling tower that has a heat transfer pipe and a fan that blows air to the heat transfer pipe, a compressor, and a condenser. A cooling system equipped with a chiller having an expansion valve, an evaporator, and a refrigerant that circulates through these, and a pipe line that guides the fluid to be cooled returning from the equipment to be cooled to the cooling tower and the evaporator, and then sends it out to the equipment. A cooling device in which the cooling tower is an evaporative cooling tower having a water sprinkling mechanism has been proposed (Utility Model Application No. 84480/1983).

[Problems to be Solved by the Invention] The above-mentioned cooling device is a cooling device that can maintain a constant temperature in a medium-low temperature range of about 18 to 29°C and prevents unnecessary cooling. Or, although the amount of water sprinkled is continuously controlled, because the compressor is controlled by starting and stopping one unit or by controlling the number of units, there is a large transient change when starting and stopping the compressor. Immediately after the compressor is started, the temperature of the fluid sent to the equipment becomes too low, and immediately after the compressor is stopped, the temperature of the fluid sent to the equipment becomes too high.

Therefore, an object of the present invention is to provide a cooling device that alleviates transient changes in the temperature of the fluid to be cooled sent to equipment when the compressor is started and stopped.

[Means for Solving the Problem] The present invention has been made to solve the two-pronged problem, that is, claim 1 of the present invention is a heat transfer pipe, a fan blowing air to the heat transfer pipe, a cooling tower having a cooling tower, a chiller having a compressor, a condenser, an expansion valve, an evaporator, and a refrigerant that circulates through these; and after the fluid to be cooled returning from the equipment to be cooled is led to the cooling tower and the evaporator in this order, In a cooling system that is equipped with pipes that send air to equipment, the airflow rate of the fan is temporarily reduced when the compressor is started, and the airflow rate of the fan is temporarily increased when the compressor is stopped. It is a device. In this case, it does not matter whether the cooling tower is an air-cooled type or an evaporative type, and it does not matter whether the condenser is an air-cooled type or a water-cooled type.

According to a second aspect of the present invention, the cooling tower in the cooling device is an evaporative cooling tower having a mechanism for distributing water to the heat transfer pipes, and when starting the compressor, the amount of water covered to the heat transfer pipes is temporarily reduced;
In the cooling device according to claim 1 or 2, the cooling device temporarily increases the amount of water sprinkled on the heat transfer pipe when the compressor is stopped. 6. Claim 4 is a cooling device according to claim 1 or 2, in which the condenser is a water-cooled condenser, and the fluid to be cooled returning from the equipment to be cooled is guided to the water-cooled condenser and then the cooling is performed. This is the cooling device that led to the tower.

[Effect 1: When the compressor is started to increase the cooling capacity, the temperature of the fluid sent to the equipment temporarily decreases, but as the compressor starts, the amount of air blown by the fan or the amount of air dissipated into the heat transfer pipes decreases. Since the amount of water is temporarily reduced, the transient characteristics at compressor startup are improved. Similarly, when the compressor is stopped to reduce the cooling capacity, the temperature of the fluid sent to the equipment temporarily increases, but the amount of air blown by the fan or the amount of water sprinkled on the heat transfer pipe increases in conjunction with the stop of the compressor. Since the temperature is temporarily increased, the transient characteristics when the compression heat is stopped are improved.

``Example 1 4 Second example to explain the embodiment of the present invention based on the attached drawings''
The figure is a system diagram of an embodiment of the cooling device of the present invention. A cooling tower 1 has a plurality of layers of heat transfer pipes 2 and a fan 3. The fan 3 is driven by a motor 4, and the air inlet 5 The air that has been taken in is blown into the heat transfer pipe 2 to cool it. The chiller 10 has a compressor U, a condenser 12, an expansion valve 13, and an evaporator 14. A refrigerant circulates through the cooler 10, is compressed in the compressor 11, and converted into N in the condenser 12. The cycle of radiating heat, evaporating in the evaporator 14 via the expansion valve 13, and absorbing heat is repeated. On the other hand, the fluid to be cooled returned from the equipment 20 to be cooled is sent to the booster pump 2
1, the heat transfer pipe 2 of the cooling tower 1, the evaporator 14, and finally sent to the equipment 20 via the circulation pump 22. In addition, the drawing shows cooling tower 1, chiller 10, and equipment 2.
Although only one system of inflow and outflow piping to the cooling tower 1 and the chiller 10 is shown, all or part of these may be configured by multiple systems.6 In addition, regarding the operation of the cooling tower 1 and chiller 10, When the temperature of the temperature detector 23 attached to the outlet of the temperature detector 14 becomes higher than the set temperature range, first increase the air flow rate of the fan 3, and if the temperature of the temperature detector 23 is still higher than the set temperature range, When the compressor 11
When the number of compressors II in operation is increased and the temperature of the temperature detector 23 becomes lower than the set temperature range, the number of compressors II in operation is decreased, contrary to the above, and the temperature detector 23 is still in operation.
When the temperature of the fan 3 becomes lower than the set temperature range, the amount of air blown by the fan 3 is further reduced.

When the compressor IT is started, the temperature of the temperature detector 23 drops dramatically as shown by the dotted line in FIG. 5, which is inconvenient when cooling precision equipment, etc.

Therefore, in this embodiment, as shown in FIG. 1, when the compressor 11 is started, the air flow rate of the fan 3 is temporarily reduced, and when the compressor 11 is stopped, the air flow rate of the fan 3 is temporarily reduced. The amount of air blown by the fan 3 is controlled to be temporarily increased. As a result, as shown by the solid line in FIG.
The temperature transient characteristics of No. 3 are improved.

Note that the air flow rate of the fan 3, which is activated when the compressor 11 is started, can be reduced by a fixed amount for a fixed period of time as shown by the solid line in FIG. 1, or by a constant amount as shown by the dotted line in the figure. It is also possible to reduce the amount by a certain amount and then gradually restore it over a certain period of time.

The same applies to the increase in the amount of air blown by the fan 3 which is operated in conjunction with the compressor 11 when it is stopped. Further, the cooling tower 1 may be an evaporative cooling tower as long as it has a continuously controllable fan that blows air to the heat transfer pipe.

Next, as shown in FIG. The evaporative cooling tower is further equipped with a water sprinkling mechanism having a water tank 7 and a water sprinkling pump 8 that supplies the water in the water receiving tank 7 to the water sprinkling header 6, and as in the previous embodiment, when the compressor 11 is started and stopped. If the amount of water sprinkled on the heat transfer pipe 2 is adjusted as a means of compensating for transient changes in the compressor 11, the transient characteristics at the time of starting and stopping the compressor 11 can be improved as in the previous embodiment. Note that as a means of compensating for transient changes when the compressor starts and stops, it is also possible to adjust both the amount of air blown by the fan and the amount of water sprinkled onto the heat transfer pipe.

In the above embodiment, if the condenser 12 is cooled in the cooling tower 1, the entire device can be made compact. FIG. 3 shows such a configuration.

Further, as shown in FIG. 4, the condenser 12 is configured with a water-cooled condenser, and the fluid to be cooled returning from the equipment 20 to be cooled is transferred to the water-cooled condenser, the cooling tower 1. It may be introduced into the evaporator 14 and then sent to the equipment 20. In this case, by using a water-cooled condenser, the compression chiller unit can be made more compact.

[Effects of the Invention] The cooling device according to claim 1 or 2 is a cooling device that efficiently combines a closely spaced cooling tower and a compression chiller, and the cooling device is configured to perform cooling in order to compensate for transient changes when starting and stopping the compressor. Since the amount of air blown by the tower fan or the amount of water sprinkled on the heat transfer pipes is adjusted, the transient characteristics of the temperature of the water to be cooled when the compressor is started and stopped are improved.

In addition to having the above-mentioned effects, the cooling device according to the third aspect of the invention has the condenser built into the cooling tower, making the entire device compact.

In addition to having the above-mentioned effects, the cooling device according to the fourth aspect of the present invention has a compact compression type chiller unit.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a method of adjusting the fan air flow rate or the water sprinkling amount to the heat transfer pipe of the cooling device of the present invention, and transient changes in the temperature of the cooled fluid at the time of starting and stopping the compressor, and FIG.
4 are system diagrams of an embodiment of the cooling device of the present invention. 1...Cooling tower 2...Heat transfer vibrator 3...Fan 4...Motor 5...Air inlet 6...Water header 7...Water tank 10...Chiller 11.
... Compressor 13 ... Expansion valve 14 ... Evaporator 21
... Booster pump 23 ... Temperature detector 8 ... Water pump 12 ... Condenser 20 ... Equipment 22 ... Circulation pump agent Patent attorney Katsuhiko Inokuma

Claims (4)

[Claims] (1) A cooling tower that has a heat transfer pipe and a fan that blows air to the heat transfer pipe, a chiller that has a compressor, a condenser, an expansion valve, an evaporator, and a refrigerant that circulates through these, and equipment to be cooled. In a cooling device provided with a conduit that guides the returning fluid to be cooled through the cooling tower and the evaporator in that order, and then sends it out to the equipment, when starting the compressor, the amount of air blown by the fan is temporarily reduced; A cooling device characterized by temporarily increasing the amount of air blown by a fan when the compressor is stopped. (2) The cooling tower is constituted by an evaporative cooling tower having a water sprinkling mechanism that sprinkles water on the heat transfer pipe, and when starting the compressor, the amount of water sprinkled on the heat transfer pipe is temporarily reduced, and the 2. The cooling device according to claim 1, wherein the amount of water sprinkled onto the heat transfer pipe is temporarily increased when the apparatus is stopped. (3) The cooling device according to claim 1 or 2, wherein the condenser is cooled by the cooling tower. (4) The cooling device according to claim 1 or 2, wherein the condenser is a water-cooled condenser, and the fluid to be cooled returning from the equipment to be cooled is guided to the water-cooled condenser and then to the cooling tower. .