JP2893335B1 - Cold water circulation feeder for physical and chemical equipment - Google Patents

Abstract

An object of the present invention is to improve the convenience of a circulating water supply device for physics and chemistry equipment utilizing heat of melting of ice. The present invention relates to a refrigeration mechanism having a control switch, which is energized through tap water in a water tank section, to connect one electrode of the control switch to the refrigeration mechanism outside the water tank section and to connect a terminal connected to the other electrode to a refrigeration mechanism in the water tank section. The tank is covered with ice growing around the evaporator of the mechanism, and is provided so as to be slightly exposed at the bottom surface or side surface position of the water tank portion which is in a non-conductive state, and further, the other electrode is divided into two electrodes. Each terminal connected to the two electrodes is provided at a distance from the evaporator so that a time lag occurs between the two terminals being covered with the growing ice and becoming non-conductive (high resistance). After the electrode at a long distance is covered with ice and becomes non-conductive (high resistance) and the refrigerating mechanism is stopped, the refrigerating mechanism is not restarted until power supply from the electrode at a short distance is started. Physical and chemical machine with relay circuit In the dexterous cold water circulation feeder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chilled water circulating feeder for scientific instruments, and more particularly to an improvement of a chilled water circulating feeder invented by paying attention to the fact that the heat of melting of ice is about 80 times that of water. is there.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed a chilled water circulating feeder for scientific instruments which was invented by paying attention to the fact that the heat of melting of ice is 80 times that of water. The invention provides a water tank for storing tap water and a supply pipe with a power supply for forcibly circulating the stored tap water in the water tank to the outside, and also cools and freezes a part of the tap water in the water tank. A mechanism is provided, and the tap water stored in the water tank is reduced by the melting heat of a part of the tap water frozen by the refrigeration mechanism.
2 ° C., and further provided with an evaporator disposed below the level of tap water in the water tank as a part of the refrigeration mechanism, and two electrodes for controlling the on / off of the refrigeration mechanism on the outer surface of the evaporator. A cold water circulating feeder for a physics and chemistry instrument having a wire switch protruded and mounted is disclosed.

[0003]

However, in the present invention, since two electrode wire switches for controlling the on / off operation of the refrigeration mechanism are protrudingly mounted on the outer surface of the evaporator, the long protruding electrode wire switch and the inside of the tank are required. In addition to the problem that the wiring cable of the routed electrode wire switch hinders cleaning, there is a problem that visual observation of the wiring cable gives a user a fear of electric shock and early deterioration of the cable.

Further, since the refrigeration mechanism is turned ON by energizing between the two electrode wire switches, the two electrode wire switches are covered with the grown ice and become non-conductive (high resistance) so that the refrigeration mechanism is turned off. Immediately after the operation is once turned off, the ice melts and the refrigeration mechanism is turned on again as soon as power is supplied between the two electrode wire switches, and the on / off operation is repeated around this boundary. Therefore, there is a problem that the refrigeration mechanism may be damaged by frequent repetition of ON / OFF of the refrigeration mechanism.

[0005]

SUMMARY OF THE INVENTION The present invention has a water tank for storing tap water and a power supply line for forcibly circulating the stored tap water in the water tank to the outside. An evaporator of a refrigeration mechanism for cooling and freezing part of the tap water in the water tank is provided below, and the stored tap water in the water tank is melted by the heat of fusion of a part of the tap water frozen around the evaporator. In a chilled water circulating feeder for physics and chemistry equipment which is maintained and cooled at about 0 ° C., one electrode of a control switch of the refrigerator, which is energized through tap water in the water tank, is connected to the refrigerator outside the water tank. And a terminal connected to the other electrode is slightly exposed at the bottom or side position of the water tank portion which is covered with ice growing around the evaporator and becomes non-conductive (high resistance) state. And further distribute the other electrode into two In addition, the terminals connected to the two electrodes are provided at a distance from the evaporator, and a time difference occurs until the two terminals are covered with the growing ice and become non-conductive (high resistance). After the electrode at a long distance is covered with ice and becomes non-conductive (high resistance) and the refrigerating mechanism is stopped, the refrigerating mechanism is not restarted until normal energization from the electrode at a short distance is started. Such a problem is solved by providing a relay circuit to be used.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a structural view of a chilled water circulation feeder according to the present invention. A box-shaped body 1 and a water tank 2 for storing tap water W are provided in the upper half of the box-shaped body 1. Aircraft 1 below
The refrigeration mechanism 3 is installed inside. Reference numerals 4a and 4b denote coil-shaped (spirally wound) evaporators disposed below the liquid surface on both sides of the water tank 2 as a part of the refrigeration mechanism 3, and 4b denotes a part below the water tank 2 of the evaporator 4a. This is a part connected to the refrigeration mechanism 3.

The outgoing pipe 5a of the circulation pipe 5 is connected to a discharge pipe 8 provided with a pump 7 provided outside the water tank 2 with a valve 6 interposed therebetween, and the end of the return pipe 5b is connected to the inside of the water tank 2. I do. 9 is a connecting pipe connecting between the pump 7 and the bottom of the water tank unit 2. The outgoing pipe 5a is provided with a three-way valve (not shown), and a return pipe (not shown) is connected to one side, and the tap water W discharged from the pump 7 is returned to the outgoing pipe 5a by switching the three-way valve. You may make it possible to switch supply to a pipe.

One (-) electrode 10 constituting an ON / OFF control switch of the refrigeration mechanism 3 is connected to a portion 4b below the water tank 2 of the evaporator 4a. Since the refrigerating mechanism 3 including the evaporators 4a and 4b has integral conductivity, the refrigerating mechanism 3 may be connected to any convenient position outside the water tank 2. The other (+) electrode is two electrodes 11
a and 11b, one of the electrodes 11a is connected to the terminal 12 on the bottom of the water tank 2 very close to the evaporator 4a as shown in FIG.
a so that the terminal 12b of the other electrode 11b is close to the evaporator 4a, and
The terminal 12a is provided so as to be slightly exposed on the bottom surface of the water tank 2 at a distance greater than the distance between the terminal and the terminal 12a. 13 is a packing for stopping water, 14 is an insulating collar, and 15 is a fixed mold. With the above-described wiring means, the inside of the water tank unit 2 is neat without the wiring cable or the like being routed, and since it can be performed outside the water tank unit 2, work efficiency is improved and productivity is improved. The one electrode 10 and the other electrodes 11a and 11b are connected to a relay circuit 16 shown in FIGS.

In the present invention, when the evaporator 4a is filled in the water tank 2 with tap water W in such an amount as to sink below the liquid level and the switch is turned on, the tap water is supplied between the electrodes 10 and 11a and 11b constituting the control switch. Electricity is supplied via W, the refrigeration mechanism 3 is turned ON, the evaporator 4a becomes a minus temperature, and the surrounding tap water W is cooled and gradually frozen.

When the ice I around the evaporator 4a grows outward in the same manner, the ice I around the evaporator 4a first comes close to the terminal 12a of the electrode 11a at a short distance as shown in FIG. 2 (b). When the electrode 11a becomes non-conductive (high resistance) and the ice I of the evaporator 4a grows, the grown ice I eventually becomes a terminal 12b of the electrode 11b at a long distance as shown in FIG. 2 (c). Is controlled, so that the refrigeration mechanism 3 is automatically stopped by a switching action when all of the electrodes 10 and 11a and 11b are in a non-conductive (high resistance) state.

The operation of the relay circuit 16 during this time will be described with reference to FIG. At the start of the operation from the state before the operation shown in FIG. 3A, the current flows from the terminal 12a of the electrode 11a to the electrode 10 via the tap water W, the evaporator 4a, and the portion 4b below the water tank portion 2 so that the transformer 17 is started. As shown in FIG. 3 (2), the relays RLO1 and RLO2 are turned on, the relay contacts 18 and 19 are closed, and the refrigerating mechanism 3 starts to operate. Current flows through 10. Eventually, as shown in FIG. 4 (3), the terminal 12a is covered with the ice I grown around the evaporator 4a and the current to the evaporator becomes non-conductive (high resistance), but the current from the terminal 12b continues to be Since the refrigeration mechanism 3 is flowing to 10, the ON state is maintained. FIG. 4
As shown in (4), when the ice I grows and covers the terminal 12b, the terminal
Since the normal current stops flowing through the electrode 10 from either of the electrodes 12a and 12b, the voltage of AC8V generated in the transformer 17 is reduced (made nonconductive), and the relay contacts 18 and 19 are opened. 3 stops the operation. When the operation of the refrigeration mechanism 3 is stopped, the ice I begins to melt soon, and the terminal 12b far from the evaporator 4a appears first as shown in FIG. 4 (5). Is not connected to AC8V and the terminal 12
The necessary current does not flow from b to the electrode 10, and therefore, in this state, the operation of the refrigeration mechanism 3 does not resume. Further, as shown in FIG. 4 (6), when the ice I melts and the terminal 12a appears,
Since the electrode 11a on the terminal 12a side is directly connected to the transformer 17 side, an AC
The voltage of 8 V is generated, the relays RLO1, RLO2 become 0N, the relay contacts 18, 19 are closed, the refrigeration mechanism 3 is turned ON again, and the operation is started. Thereafter, the operations shown in FIGS. 4 (3) to (6) are repeated, so that a so-called hysteresis with a considerable time difference between the stop of the operation of the refrigeration mechanism 3 and the restart of the operation is created. This hysteresis can be varied by adjusting the difference in distance between the two terminals 12a and 12b from the evaporator.

By the above operation, the apparatus stands by in a state where a certain amount of ice I formed by freezing a part of tap water W in the water tank 2 is formed. These icing operations are performed before the operation of circulating the cooling water to the external equipment, for example, in the middle of the night when electricity rates are low. If the start of operation is set to a time that is ready for preparation by using a timer in consideration of the environment, the number of repetitions of the above (3) to (6) can be suppressed to a very small value.

When the external equipment 20 such as an analytical instrument such as a rotary evaporator or a Soxhlet or a test apparatus is cooled, the equipment which cools each of the forward pipe 5a and the return pipe 5b of the circulation pipe 5 is cooled. The pump 6 is operated by connecting to the circulation inlet and outlet 20 respectively, opening the valve 6. The tap water W discharged from the pump 7 to the discharge pipe 8 is forcibly supplied to the equipment 20 from the outward pipe 5a.
The heat is exchanged inside 20 and returned to the water tank 2 via the return pipe 5b, circulated around the ice I, cooled to near 0 ° C. by the heat of melting of the ice I, and forcedly supplied again to the external equipment 20. It repeats that. The tap water W in the water tank section 2 can maintain a water temperature near 0 ° C. almost stably until all the ice I is melted.

It is possible to operate the refrigerating mechanism 3 while circulating the tap water W to the external equipment 20 to perform the icing work in parallel, but the amount of heat for cooling is previously formed. When the amount of ice is sufficient, the refrigeration mechanism 3
It can be used in the F state. Therefore, in this case, the power consumption is extremely reduced by not operating the refrigeration mechanism 3 so that a plurality of units are not used at the same time in the facility environment under the limited power supply condition, and the use of other devices is not hindered. Becomes

FIG. 5 shows a state in which the circulation line 5 has been removed so that it can be used as a low-temperature bath. Since the electrode wires are wired outside the water tank section 2, the inside of the water tank section 2 is neat and neat, so that it is easy to use as a low constant temperature water tank.

[0017]

As described above, according to the present invention, one electrode of the control switch for turning on / off the refrigerator is connected to the refrigerating mechanism outside the water tank and the terminal connected to the other electrode is connected to the terminal of the refrigerating mechanism. The electrode is slightly exposed on the bottom or side surface of the water tank part which is covered with ice grown around the vessel and becomes non-conductive (high resistance). The efficiency of wiring work is improved as compared to performing it, and the productivity is improved.Furthermore, there is no electrode wire switch protruding into the water tank or the wiring cable running around the tank, so the water tank is clean and the tank is easy to clean. In addition, since the wiring cable is not visually observed, there is an effect of eliminating the possibility of giving the user anxiety such as electric shock and early deterioration of the cable.

As a result, the inside of the water tank can be widely used, and by removing the circulation pipe from the apparatus, there is an effect that the low temperature constant water tank can be easily used for cold and hot storage.

The other electrode is divided into two electrodes.
Providing each terminal connected to the two electrodes at a distance from the evaporator so as to provide a time lag until the two terminals are covered with growing ice and become non-conductive (high resistance);
In addition, after the refrigeration mechanism is stopped in a non-conductive (high resistance) state in which the terminal of the electrode at a long distance is covered with ice, the refrigeration mechanism is not restarted until normal energization starts from the terminal of the electrode at a short distance. With the provision of the relay circuit described above, it is possible to arbitrarily set a hysteresis for providing a time margin between the stop and restart of the refrigeration mechanism. Thus, an effect is obtained that the possibility of damage to the device can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration example of a chilled water circulating machine.

FIG. 2 is a view showing a state of ice formation, (a) is an initial stage of formation, (b) is a state in which an electrode terminal on a side near an evaporator is covered with ice, and (c) is a perspective view. FIG. 4 is a partially enlarged cross-sectional view showing a state where the terminals of the electrodes are covered with ice.

FIG. 3 is a diagram showing the action of the relay circuit, (1) before starting operation, (2) at starting operation, (3) when the electrode terminal near the evaporator is covered with ice, (4) shows the operation when the terminals of both the far and near electrodes are covered with ice, respectively.

Fig. 4 (5) shows the operation when the terminal of the electrode on the far side is released from the ice coating, and (6) shows the operation when the terminal of both the far and near electrodes is released from the ice coating. It is.

FIG. 5 is a cross-sectional view showing a state in which a circulation pipeline is removed and used as a low-temperature bath.

[Explanation of symbols]

 1 is a box-shaped body 2 is a water tank part 3 is a refrigeration mechanism 4a is an evaporator 4b is a part below the water tank part of the evaporator 5 is a circulation pipe 5a is a forward pipe 5b is a return pipe 6 is a valve 7 is a pump 8 is a discharge pipe 9 Is a connecting pipe 10 is one (-) electrode 11a, 11b is divided into two, and the other electrode 12a, 12b is a terminal 13 is a packing for stopping water 14 is an insulating collar 15 is a fixed mold 16 is a relay circuit 17 is a transformer 18 and 19 are relay contacts 20 is external equipment

Continuation of the front page (58) Fields investigated (Int.Cl. ⁶ , DB name) F25D 11/00 102 F25D 13/00 F25D 17/02 F25C 1/00 B01L 7/00 B01L 11/00

Claims (2)

(57) [Claims] 1. A water tank for storing tap water, and a supply pipe with a power supply for forcibly circulating the stored tap water in the water tank to the outside, and a water supply pipe in the water tank below the level of the tap water in the water tank. An evaporator of a refrigeration mechanism for cooling and freezing part of the water is provided, and the stored tap water in the water tank is kept close to 0 ° C. and cooled by the heat of fusion of a part of the frozen tap water around the evaporator. In the chilled water circulating feeder for a physics and chemistry apparatus as described above, one electrode of a control switch of the refrigerator, which is energized through tap water in the water tank, is connected to the refrigeration mechanism outside the water tank and the other electrode. A terminal connected to the evaporator is provided so as to be slightly exposed at the bottom or side surface position of the water tank portion which is covered with ice growing around the evaporator and becomes non-conductive (high resistance) state. Cold water circulation feeder for scientific equipment. 2. The other electrode is distributed to two electrodes, and both terminals connected to the two electrodes are provided at a distance from the evaporator, and the two terminals are respectively coated with growing ice. A time difference is caused until the non-conductive (high resistance) state is reached, and after the refrigeration mechanism is stopped by the switching action of the non-conductive (high resistance) state where the electrode at a long distance is covered with ice, the near-end state is reached. 2. The chilled water circulating supply device according to claim 1, further comprising a relay circuit that prevents the refrigeration mechanism from restarting until normal energization starts from a distance electrode.