JPH0972644A - Cold water circulating and supplying machine for scientific device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable cooled tap water to be circulated to various kinds of devices in concurrent with starting in operation by a method wherein a freezing mechanism for cooling a part of the tape water in a water tank to cause it to be iced is installed, and tap water stored in the water tank is cooled under utilization of melting heat for the iced tap water. SOLUTION: Tap water W much enough to cause both evaporators 4a, 4b to be immersed in a liquid is fed in a water tank part 2 and at the same time a three-way valve 7 is changed over to release a returning pipe 10 side and then a switch is turned on. Then, a pump device 8 is operated to cause tap water W discharged out of a discharging pipe 9 to be circulated in the water tank 2 so as to form a water flow. Concurrently, both evaporators 4a, 4b show a minus temperature, the tap water W is cooled to be iced. In addition, ice is grown outwardly to cover both electrode line switches 5a, 5b, resulting in that a freezing machine 3 and the pump device 8 are automatically stopped under this switching action. Then, when the outer equipment device 11 is to be cooled, circulating pipe passages 6a, 6b are connected to the device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold water circulation feeder for physics and chemistry equipment.

[0002]

2. Description of the Related Art A cold water circulation feeder of this kind, which circulates a circulating fluid of a constant temperature through various analytical instruments for physics and chemistry and keeps the temperature of the equipment constant, keeps the circulating fluid. It consists of a water tank section and a refrigerator with a control mechanism for cooling the liquid in the tank to a constant temperature, and a circulation pipe line with a pump for circulating the liquid to an external device. The temperature of the circulating fluid is maintained at a constant value by intermittently operating the refrigerator with the feedback system from the temperature sensor.

[0003]

However, even when the refrigerator is started, it takes a considerable amount of time for the circulating fluid to be cooled to a constant temperature, and it is not possible to circulate the circulating fluid at the same time when the work is started. There is a problem that you cannot do it. Further, such a refrigerator consumes a large amount of electric power, and thus has a problem that it is difficult to continuously operate in balance with other devices within the limited electric capacity supplied to the laboratory.

[0004]

SUMMARY OF THE INVENTION The present invention was invented by paying attention to the fact that the heat of melting of ice is about 80 times that of water, and a water tank for storing tap water and tap water stored in the water tank. Is provided with a power supply pipe line for supplying forced circulation to the outside, and a freezing mechanism for cooling and freezing a part of the tap water in the water tank section is provided, and a part of the water supply that has been frozen in advance by the freezing mechanism. It is intended to solve such a problem by keeping the stored tap water in the water tank near 0 ° C. by the heat of fusion of water to cool it.

[0005]

According to the present invention, the refrigeration mechanism is operated in advance to start the circulation of the cooling water so that a part of the tap water in the water tank portion is frozen, and the unfrozen tap water in the water tank portion is powered by a circulating pipe line. Is supplied to an external device, and the temperature of the tap water that has risen due to heat exchange with the external device and is circulated is re-cooled by the heat of melting of the frozen tap water and kept near 0 ° C. is there.

[0006]

An embodiment will be described below with reference to the drawings.

The figure shows the structure of the cold water circulation feeder of the present invention. The box-shaped machine body 1 and the tap water W in the upper half of the box-shaped machine body 1 are shown.
The water tank section 2 for storing the water is provided, and the refrigeration mechanism 3 is installed in the machine body 1 below the water tank section 2. 4a and 4b are evaporators which are arranged as a part of the refrigeration mechanism 3 at positions below the liquid level on both sides in the water tank unit 2,
Electrode wire switches 5a and 5b are provided so as to project and be attached to two locations on the outer surface of the evaporator 4a which are separated from each other.

The circulation pipe 6 is provided with a three-way valve 7 on the base side of the outward pipe 6a, and a discharge pipe 9 with a pump unit 8 which is immersed in an intermediate portion in the water tank portion 2 is connected to the other one of the three-way valves 7. On the other hand, on the other hand, a return pipe having an end portion arranged in the middle of the water tank portion 2.
10 is connected, and the discharge pipe 9 is switched by switching the three-way valve 7.
The discharged tap water W is switched and supplied to the outward pipe 6a and the return pipe 10. In addition, the end of the return pipe 6b is a return pipe.
Piped in the water tank portion 2 in the vicinity of 10.

When the evaporator 4a, 4b is filled with tap water W in such an amount that the evaporators 4a, 4b are submerged below the liquid surface, the three-way valve 7 is switched to open the return pipe 10 side, and the switch is turned on. The tap water W discharged from the discharge pipe 9 by the operation of the pump unit 8 circulates in the water tank portion 2 through the return pipe 10 to generate a water flow surrounding the evaporators 4a and 4b as shown by arrows in the figure. produce. At the same time, the evaporators 4a and 4b have a negative temperature, and the surrounding tap water W
It is cooled and gradually frozen. The above water flow improves the heat exchange between the tap water W and the evaporators 4a and 4b, and the impurities in the tap water W do not mix with the ice, and the ice I is formed by pure water. .

When the ice I around the evaporators 4a and 4b grows outward, the ice I eventually switches to the electrode wire switch as shown in FIG.
The refrigeration mechanism 3 and the pump unit 8 are switched by a switching action in which the electrode wire switches 5a and 5b covered with pure water ice are in a non-conductive state.
Is controlled so that it automatically stops. Since the refrigeration mechanism 3 and the pump unit 8 are controlled independently, it is possible to automatically stop only the refrigeration mechanism 3. When the ice I is melted and the electrode wire switches 5a and 5b are exposed, the space between the switches becomes conductive via the tap water W, whereby the refrigeration mechanism 3 and the pump unit 8 when stopped is reactivated, The electrode line switches 5a and 5b are surrounded by ice, become non-conductive, and grow a certain amount of ice I until a switching action occurs. The remaining tap water W which is not frozen is also cooled to near 0 ° C.

With the above operation, a part of the tap water W is frozen in the water tank portion 2 and a certain amount of ice I is formed to stand by. It should be noted that these icing works are carried out before the work of circulating the cooling water in an external device, for example, in the middle of the night when the electricity charges are low.

When cooling an external analytical device such as a rotary evaporator or soxhlet or the test device 11, a device for cooling the outward pipe 6a and the return pipe 6b of the circulation pipe 6 as shown in FIG. The pump unit 8 is operated by connecting to the circulation inlet / outlet of the device 11 and switching the three-way valve 7 so that the outward pipe 6a side is opened.
Tap water W discharged to the discharge pipe 9 by the pump unit 8
Is forcibly supplied to the device 11 from the outward pipe 6a, and the device 11
Heat is exchanged in the inside of the container, returns to the inside of the water tank 2 through the return pipe 6b, circulates around the ice I, is cooled to near 0 ° C. by the heat of melting of the ice I, and is again forcedly supplied to the external device 11 It is repeated. The tap water W in the water tank portion 2 can maintain a water temperature near 0 ° C. almost stably until the ice I is completely melted and disappears.

It is also possible to operate the freezing mechanism 3 in parallel while circulatingly supplying the tap water W to the external equipment 11, but the amount of heat for cooling is previously formed. When the amount of ice is sufficient, the refrigeration mechanism 3 is OF
It can be used in the F state. Therefore, in this case, the refrigeration mechanism 3 is not operated so that the power consumption is extremely reduced and a plurality of units are not used at the same time in an equipment environment where the power supply is limited, or the use of other devices is not disturbed. Becomes

[0014]

As described above, according to the present invention, since the circulating tap water is cooled by the large heat of melting of a part of the tap water that has been frozen beforehand to become ice, it is cooled at the same time when the work is started. The effect that tap water can be circulated to various devices is produced.

Since it is not necessary to operate the refrigeration mechanism during the cold water circulation supply, the limited electric capacity supplied to the facility environment such as a laboratory can be used for other equipment, which is excellent in the surrounding power supply situation. In addition to the advantages described above, it is possible to simultaneously operate a plurality of cold water circulation feeders of the present invention.

Compared with the refrigeration mechanism for cooling at the same time as the circulation work, the refrigeration mechanism for performing the freezing work in advance has a small output and is small in size, so that the manufacturing cost can be greatly reduced. There is an effect that the energy cost can be remarkably reduced by using the late night electric power which is cheap.

Since the supply pipe is provided with a switching pipe for circulating the stored tap water only in the water tank to form a water flow circulating around the refrigeration mechanism, heat exchange between the refrigeration mechanism and tap water is excellent. In addition to promoting the growth of ice, it has the effect of enabling the formation of dense ice and increasing livestock energy.

Since the two electrode wire switches for controlling the on / off of the refrigerating mechanism are provided so as to be projected and attached, there is an effect that the icing work can be automatically controlled with a simple structure and less causes of failure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state when ice is formed.

FIG. 2 is an enlarged view of an electrode wire switch portion of the same.

FIG. 3 is a cross-sectional view showing a state during forced supply of cooling water.

[Explanation of symbols]

 1 is a box-shaped machine body 2 is a water tank part 3 is a refrigeration mechanism 4a, 4b is an evaporator 5a, 5b is an electrode wire switch 6 is a circulation pipe 6a is a forward pipe 6b is a return pipe 7 is a three-way valve 8 is a pump unit 9 is discharge Tube 10 is a device outside the return tube 11

Claims (3)

[Claims] 1. A water tank part for storing tap water and a power supply pipe line for forcibly circulating the stored tap water of the water tank part to the outside are provided, and a part of the tap water in the water tank part is cooled to freeze. A cold water circulation for physicochemical equipment, characterized in that a refrigerating mechanism is provided, and the stored tap water in the water tank is held and cooled near 0 ° C. by the heat of fusion of a portion of the tap water frozen by the refrigerating mechanism. Feeder. 2. The cold water circulation feeder according to claim 1, wherein the supply pipeline is provided with a switching pipeline for circulating the stored tap water only in the water tank. 3. An evaporator is provided as a part of the refrigeration mechanism below the surface of tap water in the water tank, and two electrode wire switches for controlling on / off of the refrigeration mechanism are attached to the outer surface of the evaporator. The chilled water circulation feeder according to claim 1.