JP2001241817A - Vacuum cooling device and method of using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable brined freezer to be small in size, a more efficient preferable heat accumulation to be realized and further enable its running cost to be reduced. SOLUTION: There are provided vacuum cooling tanks V1, V2; vacuum pumps P1, P2 for reducing air pressure in the vacuum cooling tanks V1m V2; a cold trap 10 cooled with brine so as to cause water vapor contained in discharged air of the vacuum cooling tanks V1, V2 to be condensed and removed; a brine freezer 20; a first brine circulating circuit 31 constituted to include the brine freezer 20; a first circulation pump 28; a second brine circulation circuit 31 constituted to include the cold trap 10; second circulation pump 32; a heat exchanging means 60 for performing a heat exchanging operation between the first the brine circulation circuit 21 and the second brine circulation circuit 31; and a heat accumulating tank 50 arranged between the brine freezer 20 and the heat exchanging means 60 by the first brine circulation circuit 21 so as to store cooling energy attained by the brine freezer 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cooling device having a heat storage tank and a method of operating (using) the same. The principle of vacuum cooling will be described below. The temperature at which water boils is 100 ° C. under atmospheric pressure (1013 hPa), and is 100 ° C. or lower in places such as high mountains where the atmospheric pressure is low. Then, when water evaporates, about 2300 kJ of heat is taken from the surroundings for every 1 kg of water. The lower the atmospheric pressure, the lower the boiling point, about 6h
At Pa, it boils at about 0 ° C. Vacuum cooling is the one that utilizes the heat of evaporation of water, and the water contained in the object to be cooled (e.g., vegetables) placed in the vacuum tank by lowering the pressure in the vacuum tank with a vacuum pump is used. The object to be cooled can be rapidly cooled by the evaporation heat at this time.

By the way, since the volume of water vapor generated by evaporation of water becomes very large, a vacuum pump having an extremely large output is required to exhaust the water vapor as it is and to increase the degree of vacuum. I will. For this reason, the vacuum cooling device uses a cold trap to coagulate (condensate) water vapor to convert it into water droplets and collect it, and a vacuum pump discharges only air. Therefore, in the vacuum cooling device, the performance of the cold trap is an important factor, and there is a problem how to operate the cold trap efficiently and economically.

[0003] This vacuum cooling is used, for example, for vacuum pre-cooling of vegetables. That is, according to the vacuum cooling, the temperature of the product can be lowered as quickly as possible immediately after harvesting the vegetables, mainly leafy vegetables such as lettuce and cabbage, before shipping. Thereby, the respiratory action of the vegetables can be suppressed, and the freshness of the vegetables during distribution can be kept higher. After vacuum pre-cooling, it is shipped quickly in a refrigerator car or stored in a refrigerator.

[0004]

2. Description of the Related Art A conventional vacuum cooling device will be described with reference to FIG. V1 and V2 are vacuum cooling tanks, which are containers for cooling an object to be cooled by the action of vacuum cooling. P1 and P2 are vacuum pumps, and a vacuum cooling tank V
1. Two rough pumps P1 and P2 are provided to suck and exhaust air so as to lower the pressure in V2. Reference numeral 10 denotes a cold trap which condenses and removes water vapor contained in the exhaust air from the vacuum cooling tanks V1 and V2 before the vacuum pumps P1 and P2 (in particular, the vacuum pump P2 of the present application) suck and exhaust the water vapor. , Cooled by brine. Reference numeral 20 denotes a brine refrigerator for cooling the brine. Reference numeral 30 denotes a brine tank, which is a tank for storing brine. The brine is a liquid used in the cooling system.

Further, reference numeral 42 denotes a brine pipe, which connects the brine refrigerator 20, the cold trap 10, the brine tank 30, and the circulation pump 44 in a closed loop. Thus, a brine circulation circuit 40 in which the brine circulates is configured. By operating the circulation pump 44, the brine cooled by the brine refrigerator 20 circulates, flows through the cold trap 10, and can cool the cold trap 10. Note that 22
Is a cooling tower section, which is configured by connecting a heat receiving section 22a, a water cooling circulation pump 22b, and a heat radiating section 22c arranged in the brine refrigerator 20 by a cooling water pipe 22d.

According to the vacuum cooling apparatus thus constructed, the inside of the vacuum cooling tanks V1 and V2 is suitably depressurized (vacuum) by the vacuum pumps P1 and P2 and the cold trap 10, etc. The water content of the cooling material can be evaporated, and the cooling can be completed in a short time of, for example, 20 to 30 minutes. Agricultural products as objects to be cooled using vacuum cooling include lettuce, cabbage, Chinese cabbage, etc. as leafy vegetables, and fruit and vegetables such as broccoli, green beans, pods, corn, etc. It may be about 1 to 3%, there is almost no fear of loss, and there is no damage to those agricultural products.

[0007]

However, in the conventional vacuum cooling apparatus described above, the flash point at which the evaporation of moisture from the object to be cooled starts at the initial stage of performing the main evacuation by the vacuum pump V2 referred to in the present invention. When it is called, because the amount of generated steam is the maximum and the refrigeration load is the maximum,
Cooling energy required at that time (maximum refrigeration capacity)
, The brine refrigerator 20 was selected. That is, even if a large refrigeration capacity is not required if leveling is performed, there is a problem that a large brine refrigerator 20 must be used in accordance with the maximum refrigeration capacity required instantaneously (in a short time). there were. Further, at the peak of the refrigeration load, the circulating brine temperature rises considerably. The operation in which the situation in which the temperature change is large as described above is not a favorable condition for the durability and the like of the brine refrigerator 20.

On the other hand, as shown in FIG. 5, an ice heat storage tank 50 is disposed between the brine refrigerator 20 of the brine pipe 42 and the cold trap 10, and when the vacuum cooling is not performed, the ice heat storage tank 50 is provided. It is conceivable that brine is short-circuited in the short-circuit path 51 so as to prevent cooling water from flowing through the cold trap 10 and circulate so that cooling energy is stored. According to this, when performing vacuum cooling, the short circuit is released, brine is flown into the cold trap 10, and the cooling energy stored by the ice heat storage tank 50 can be used. For this reason, according to this vacuum refrigeration apparatus, it is possible to continuously operate the brine refrigerator 20 and cool the cold trap 10 with the leveled cooling output.

However, in the configuration for cooling the cold trap 10 as described above, since the cold trap 10 and the ice heat storage tank 50 communicate with each other via the brine pipe 42, the temperature range of the brine for cooling the cold trap 10 is as follows. The temperature range of the brine that cools the ice heat storage tank 50 is set to be equal, and the specifications (freezing point, etc.) of the brine are set. That is, the temperature of the cold trap 10 is set to a temperature higher than the temperature at which the ice heat storage is efficiently performed in order to prevent the vegetables and the like from being excessively cooled and frozen. For this reason, there was a problem that more efficient operation of the vacuum cooling device was not performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vacuum cooling device which can reduce the size of a brine refrigerator, can store heat more efficiently and suitably, and can further reduce running costs, and a method of using the same. is there.

[0011]

The present invention has the following arrangement to achieve the above object. That is, the vacuum cooling device according to the present invention includes a vacuum cooling tank, which is a container for cooling an object to be cooled by the action of vacuum cooling, and suction and exhaust of air so as to reduce the pressure in the vacuum cooling tank. A vacuum pump, and a cold trap disposed between the vacuum cooling tank and the vacuum pump so as to condense and remove water vapor contained in the exhaust of the vacuum cooling tank, and cooled by flowing brine. A vacuum refrigeration system comprising: a brine refrigerator for cooling the brine; a first brine circulating circuit configured to include the brine refrigerator and circulating the cooled brine;
A brine circulation circuit comprising: a first circulation pump for circulating brine; and the cold trap;
The second cooling brine circulation of the cold trap
And the second brine circulation circuit,
A second circulation pump for circulating brine, heat exchange means for exchanging heat between the first brine circulation circuit and the second brine circulation circuit, and the first brine circulation circuit A heat storage tank is provided between the refrigerator and the heat exchange means and stores cooling energy by the brine refrigerator.

Further, by providing two vacuum cooling tanks and a switching valve so that vacuum cooling of the object to be cooled is alternately performed with respect to the two vacuum cooling tanks, the efficiency is improved. Vacuum cooling can be performed using a brine refrigerator.

The present invention also relates to a method of using a vacuum cooling device for vacuum-cooling an object to be cooled by using the above-mentioned vacuum cooling device, wherein the brine refrigerator is provided with a cooling energy required for a plurality of times of vacuum cooling. The cooling energy generated by the brine refrigerator is operated at a leveled constant output and when the vacuum cooling is not performed or when the vacuum cooling is performed in a state smaller than the leveled cooling energy. Stopping or reducing the circulation of brine by the second circulation pump so as to store the heat in the heat storage tank,
When the vacuum cooling is performed in a state larger than the leveled cooling energy, the cold trap is used by using both the cooling energy generated by the brine refrigerator and the cooling energy stored in the heat storage tank. There is also a method of using a vacuum cooling device, characterized by increasing the circulation of brine by the second circulation pump so as to perform cooling.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an explanatory diagram (circuit diagram) showing an embodiment of a vacuum cooling device according to the present invention. FIG. 2 is an explanatory diagram showing a cooling cycle when two vacuum cooling tanks are used. FIG. 3 is an explanatory diagram for explaining a cycle of an operation state according to the embodiment of FIG. 1. FIG. 3A is a graph showing a pressure change in a vacuum cooling tank, and FIG. FIG. 3C is a graph showing the change, and FIG. 3C is a graph showing the leveled required refrigeration capacity. The object to be cooled in the present embodiment is a vegetable, and the present embodiment is an example of a vacuum cooling device for vegetables.

V1 and V2 are vacuum cooling tanks for cooling vegetables by the action of vacuum cooling. In the present embodiment, two vacuum cooling tanks V1 and V2 are provided (base), and the vacuum cooling of vegetables is performed by the two vacuum cooling tanks V1 and V2.
Piping and switching valve 15 so that
Is provided. Thus, the two vacuum cooling tanks V1,
To provide V2, the vacuum pumps P1 and P2, which will be described later, alternately repeat the suction and evacuation steps including roughing and main drawing as shown in FIG. That is,
FIG. 2 is an explanatory view showing a general cooling cycle. The upper part shows a cooling cycle of one (first) vacuum cooling tank V1 and the lower part shows a cooling cycle of another (second) vacuum cooling tank V2. . Both refrigeration cycles are executed along the same time axis that proceeds from left to right. A indicates the loading time, B indicates the roughing time, C indicates the main pulling time, and D indicates the loading / unloading time. S1 is the first cooling, S2 is the second cooling,
S3 indicates the entire time of the third cooling step, and S4 indicates the entire time of the fourth cooling step. In addition, the vacuum cooling tanks V1 and V2 for the object to be cooled.
Carrying in and out after cooling may use a conveyor.

P1 and P2 are vacuum pumps for sucking and exhausting air so as to lower the pressure in the vacuum cooling tanks V1 and V2. P1 is a rough-quoted vacuum pump, and P2 is a vacuum pump of the present quote, each of which is provided two by two. In this manner, the vacuum pumps for the main pulling and the roughing are arranged exclusively, and the paths are switched by the automatic valve (switching valve 15), so that the rough-referenced vacuum pump P1 and the main-referenced vacuum pump P2 are arranged as shown in FIG. As shown in FIG. Thereby, the vacuum pumps P1 and P2 can be used efficiently. In this embodiment, the brine is supplied to the cold trap 10 only at the time of the main draw.

As the vacuum pumps P1 and P2, oil rotary pumps and water ring pumps have been used in many cases, but recently dry pumps have been used in many cases.
The holding pressure in the vacuum cooling tanks V1 and V2 is set so that the vegetables reach the cooling target temperature by a vacuum pump P so as to be saturated.
1. The operation of P2 is controlled. In addition, if the pressure is reduced more than necessary, freezing occurs when the vegetables are cooled. For this reason,
In general, the pressure is adjusted by changing the opening of a valve in a pipe close to the vacuum pumps P1, P2 by the pressure in the vacuum cooling tanks V1, V2.

Since the vacuum cooling tanks V1 and V2 and the vacuum pumps P1 and P2 are provided as described above and used as shown in FIG. 2, the pressure change in the vacuum cooling tanks V1 and V2 and the necessary refrigeration required for cooling are performed. The change of the ability is as shown in FIG. FIG. 3A shows pressure changes in the vacuum cooling tanks V1 and V2 in a superimposed manner. In FIG. 3A, the elapsed time (min) is plotted on the horizontal axis T, and the pressure (hPa) is plotted on the vertical axis P. A black square point indicates a pressure change in the first vacuum cooling tank V1, and a white square point indicates a pressure change in the second vacuum cooling tank V2. As is apparent from the figure, the first vacuum cooling tank V1 and the second vacuum cooling tank V2 are alternately depressurized and are each kept at a high degree of vacuum for a predetermined time. When the vegetables are carried in and out, the air is released to the atmosphere and, of course, returns to the atmospheric pressure.

In response to such pressure changes in the vacuum cooling tanks V1 and V2, the required refrigerating capacity changes as shown in the graph of FIG. In FIG. 3B, the abscissa indicates the elapsed time (min) on T, and the ordinate P indicates the cooling capacity (MJ / Hr).
Is taken. The black square point is the first vacuum cooling tank V
1 shows a change in required refrigerating capacity, and a white square indicates a change in required refrigerating capacity in the second vacuum cooling tank V2.

The fluctuation of the refrigeration load for the vacuum cooling of agricultural products (vegetables) will be described below with time. In the roughing stage,
The temperatures in the vacuum cooling tanks V1 and V2 are high, and the brine temperature is high. Generally, the flow of brine is stopped in this process. Therefore, no refrigeration load is applied at this time. The vacuum pump P1 in the rough evacuation
Is heavy, but it suffices if a plurality of vacuum pumps P1 are used. In the initial stage of the main draw, the refrigeration load (required refrigeration capacity) increases. This is because when the evaporation of water from the vegetable (the object to be cooled) starts (called a flash point), the amount of generated steam becomes maximum and the refrigeration load becomes maximum. That is, at this time, the brine has just begun to circulate, and the brine temperature rises in a short time. Accordingly, it is necessary that the refrigeration capacity of the cold trap 10 described later be maximized corresponding to that time.

Thereafter, the required refrigeration capacity gradually decreases,
Furthermore, since the process is for carrying in and out vegetables, the required freezing capacity returns to zero at that time. In the two-tank vacuum refrigerating apparatus as in this embodiment, the above cycle is performed as shown in FIG.
As shown in the graph of (b), two vacuum cooling tanks V1 and V
2 will occur alternately and continuously. In addition, it is possible to suppress a temporary rise in temperature by increasing the amount of brine, but the apparatus becomes large. Further, it is conceivable to increase the refrigerating capacity of the refrigerator to cope with the initial load, but this is not preferable in terms of maintenance cost. Therefore, a heat storage tank 50 described later is used as in the present invention.

When the required refrigerating capacity of the two vacuum cooling tanks V1 and V2 is leveled, a hatched portion shown in FIG. 3C is obtained. In FIG. 3C, the abscissa represents the elapsed time (min) on T, and the ordinate P represents the cooling capacity (MJ / Hr). In addition, the line graph by the black square point shows the total (change) of the required refrigerating capacity in the first vacuum cooling tank V1 and the second vacuum cooling tank V2. As described above, if the cold trap 10 can be suitably cooled in accordance with the two vacuum cooling tanks V1 and V2 by the leveled required refrigeration capacity, a refrigerator having a small maximum output can be used. It becomes an issue how to realize it. The contents of the invention of the present application described below can suitably cope with this problem.

Numeral 10 denotes a cold trap, which is provided with a vacuum cooling tank V1, V2 and a vacuum pump V2 so as to condense and remove water vapor contained in the exhaust of the vacuum cooling tanks V1, V2.
And cooled by flowing brine. In addition, generally, the cold trap 10
An efficient shell and tube is often used as a heat exchanger for the refrigerant. Although a direct refrigerant such as Freon gas may be used on the refrigerant side, brine is often circulated as in the present embodiment.

A brine refrigerator 20 cools the brine. As the brine refrigerator 20, a commonly used brine refrigerator can be suitably used. The brine refrigerator 20 basically includes a cooler (evaporator) 24 and a compressor (condenser) 26 related to the refrigerant, and cools the circulating brine by circulation of the refrigerant. It is needless to say that ammonia or the like can be used in place of the chlorofluorocarbon gas as the refrigerant. Also, the brine refrigerator 20
Power source can be an electric power or an engine. In addition, since the operation time is during the daytime and the seasonal use at the time of shipment of vegetables, there is an aspect that the engine type is superior in the power load contract.

Reference numeral 21 denotes a first brine circulation circuit which includes a brine refrigerator 20 and circulates cooled brine. First brine circulation circuit 21 of the present embodiment
The brine refrigerator 20, the heat storage tank 50, the heat exchanger 60 as an example of the heat exchange means, and the first circulation pump 28
They are connected and communicated by a brine pipe 29. Therefore, the brine can be circulated in the first brine circulating circuit 21 in the direction of the arrow in the drawing by the first circulation pump 28.

Reference numeral 31 denotes a second brine circulating circuit, which includes the cold trap 10 and circulates brine for cooling the cold trap 10. The second brine circulation circuit 31 according to the present embodiment includes a heat exchanger 60, a cold trap 10, a brine tank 30, and a second circulation pump 32, each of which is an example of a heat exchange unit, provided with a brine pipe 3.
4 and are connected. Therefore, the brine can be circulated in the second brine circulation circuit 31 in the direction of the arrow in the drawing by the second circulation pump 32.

The heat exchanger 60 exchanges heat between the first brine circuit 21 and the second brine circuit 32. The first brine circulating circuit 21 can be referred to as a circulating system of a brine refrigerator, and the second brine circulating circuit 31 can be referred to as a circulating system of a cold trap. A heat exchanger 60 installed between the circulation system 21 of the brine refrigerator and the circulation system 31 of the cold trap.
If a plate fin is selected, heat conversion can be performed efficiently.

Further, the heat exchange means is not limited to providing the heat exchanger 60 independently as in this embodiment. For example, in a brine tank 30, a brine pipe 29 having a function as a coil-shaped heat exchange means is provided.
Is also possible. That is, by installing the first brine circulation circuit 21 so as to pass through the brine tank 30, the circulation system 2 of the two brines is also provided.
This is a vacuum cooling device having 1, 31 and has the advantage that the same effect can be obtained and that the independent heat exchanger 60 can be omitted. In the case where the heat exchange function is obtained in the brine tank 30 as described above, when a part of the brine flowing through the second brine circulation circuit 31 is frozen to accumulate the cooling heat (latent heat), the brine is cooled. It is conceivable that stable circulation of brine becomes difficult due to the change in concentration.

In the present embodiment, as is clear from the above description, the heat storage tank 50 is provided by the first brine circulation circuit 21.
Provided between the brine refrigerator 20 and the heat exchanger 60;
The cooling energy by the brine refrigerator 20 can be stored by freezing. (That is, the heat storage tank 50 is an ice heat storage tank.) As a heat storage method, an ice heat storage method is generally used.

Next, a description will be given of a method of using a vacuum cooling device for vacuum cooling an object to be cooled using the above-described vacuum cooling device. The brine refrigerating machine 20 is operated at a constant output leveling the cooling energy required for the vacuum cooling for a plurality of times, and when the vacuum cooling is not performed, or when the vacuum cooling is smaller than the leveled cooling energy. If so, the circulation of the brine by the second circulation pump 32 is stopped or reduced so that the cooling energy generated by the brine refrigerator 20 is stored in the heat storage tank 50, and the cooling energy in which the vacuum cooling is leveled is equalized. If the cold trap 10 is cooled in the second cycle, the cooling energy generated by the brine refrigerator 20 and the cooling energy stored in the heat storage tank 50 are both used. Increase the circulation of brine by pump 32.

The heat storage tank 50 and the heat exchanger 60 as described above
According to the vacuum cooling device using the method and the method for using the same, the load of the refrigerator (the brine refrigerator 20) can be preferably leveled. That is, it is possible to suitably cope with the level refrigeration load described above with reference to FIG. Thus, when selecting the refrigerating function, it is sufficient to use the average amount of processing per unit time, so that a smaller brine refrigerator 20 can be selected. The temperature of the brine circulating in the cold trap 10 is generally around 0 ° C. Therefore, an ice heat storage tank 50 having a melting point of -10 to -5 ° C is installed, and the brine refrigerator 20 is operated under a constant load condition. When the refrigerating capacity of the brine refrigerator 20 exceeds a required load, the latent heat is reduced. The stored heat is used. As a result, the brine refrigerator 20 can perform stable constant load operation. On the other hand, on the cold trap 10 side, a predetermined required refrigeration capacity corresponding to the load can be taken out.

In the case where the power source of the brine refrigerator 20 is electric power, since the operation time is during the daytime, heat is stored using nighttime electric power (midnight electric power) in order to cut off the peak of the electric power. Heat may be used during the day. In this case, depending on the operating hours during the day,
The size can be greatly reduced as compared with the refrigeration capacity when heat storage is not considered. By increasing the amount of the brine solution, it is possible to suppress a rise in the temperature of the brine at the peak of the refrigeration load. However, the amount is very large, and it is not practical because of the difficulty in installation.

Further, in the present invention, as described above, the brine circulation system is separated into two systems in the first brine circulation circuit 21 and the second brine circulation circuit 31, and the heat exchanger 60 is provided. Intervening. With this configuration, the following effects can be obtained in the present invention. The freezing point adjustment for the brine of the first brine circulation circuit 21 is approximately −25 ° C., while the freezing point adjustment for the brine of the second brine circulation circuit 31 is approximately −10 ° C.
Is good. Thus, by setting the freezing point of the brine separately, highly efficient operation can be performed. However, the lower the freezing point, the higher the concentration of brine, the lower the fluidity, and the lower the specific heat. Therefore, when the brine for heat storage and the brine for cooling the cold trap 10 are separated as described above, the circulating pumps 28 and 32 having appropriate flow rates and heads are selected for each circulating system in consideration of the transfer power. Then, the entire transport power may be reduced. In other words,
Since it is divided into the first brine circulation circuit 21 and the second brine circulation circuit 31, it is possible to select appropriate circulation pumps 28 and 32 for each of the circulation systems, and it is particularly advantageous that the entire transfer power can be reduced. Effect. Further, since the first brine circulating circuit 21 and the second brine circulating circuit 31 are completely separated from each other, it is not necessary to specifically adjust the brine, and the cost for the brine adjustment (initial adjustment and Maintenance) can be reduced. The temperature of the brine may be adjusted by detecting the heat storage state in the heat storage tank 50 based on the brine temperature or the like, and controlling the start / stop of the brine refrigerator 20.

When the vacuum cooling apparatus uses the brine refrigerator 20 using electric power, it is possible to store heat using electric power at midnight from an economic viewpoint as described above. In this case, in order to maximize the advantage of night-time heat storage, the capacity of the refrigerator can be selected to be small by increasing the scale of the heat storage tank 50. In the case of an engine-type refrigerator, there is no advantage of using midnight power. Therefore, when determining the size of the heat storage tank 50 and the capacity of the brine refrigerator 20, a combination in which the related facility cost is the most economical is considered. do it.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. Of course it is.

[0036]

According to the present invention, the brine circulation circuit is separated into a first brine circulation circuit and a second brine circulation circuit, and the heat storage tank and the heat exchange means are suitably arranged. Can be suitably performed. Therefore, the size of the brine refrigerator can be reduced,
Heat can be stored more efficiently and preferably, and the running cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a vacuum cooling device according to the present invention.

FIG. 2 is an explanatory view showing a cooling cycle applied to two vacuum cooling tanks according to the embodiment of FIG.

FIG. 3 is an explanatory diagram illustrating a cycle of an operation state according to the embodiment of FIG. 1;

FIG. 4 is an explanatory diagram illustrating a conventional technique.

FIG. 5 is an explanatory diagram for explaining another conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cold trap 15 Switching valve 20 Brine refrigerator 21 First brine circulating circuit 28 First circulating pump 29 Brine piping 30 Brine tank 31 Second brine circulating circuit 32 Second circulating pump 34 Brine piping 50 Heat storage tank 60 Heat Exchanger V1 First vacuum cooling tank V2 First vacuum cooling tank P1 Rough vacuum pump P2 Full vacuum pump

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoichi Mori 2351-39, Inaba, Nagano City (72) Inventor Junji Takahashi 2-35-10, Yoshida, Nagano City 1242 Ishidocho (72) Inventor Taro Ishida 3-9 Takamiya Higashi, Matsumoto F-term (reference) 3L044 AA04 BA05 CA11 DC01 DD04 DD07 FA02 FA04 FA08 GA01 GA02 HA03 KA01 KA05

Claims (3)

[Claims] 1. A vacuum cooling tank, which is a container for cooling an object to be cooled by the action of vacuum cooling, a vacuum pump for sucking and exhausting air so as to reduce the pressure in the vacuum cooling tank, A cold trap disposed between the vacuum cooling tank and the vacuum pump and cooled by flowing brine, so as to condense and remove water vapor contained in the exhaust of the vacuum cooling tank; and cooling the brine. A vacuum cooling device comprising a brine refrigerator, wherein the first brine circulation circuit is configured to include the brine refrigerator and circulates the cooled brine, and the first brine circulation circuit circulates the brine. A first circulation pump, a second brine circulation circuit configured to include the cold trap, and circulates a brine for cooling the cold trap; A second circulation pump that circulates brine in the second brine circulation circuit; a heat exchange unit that performs heat exchange between the first brine circulation circuit and the second brine circulation circuit; A vacuum cooling apparatus, comprising: a heat storage tank provided between the brine refrigerator and the heat exchange means, wherein the heat storage tank stores cooling energy by the brine refrigerator. 2. The vacuum cooling tank is provided with two tanks, and a switching valve is provided so that vacuum cooling of an object to be cooled is alternately performed with respect to the two vacuum cooling tanks. 2. The vacuum cooling device according to 1. 3. A method of using a vacuum cooling device for vacuum-cooling an object to be cooled using the vacuum cooling device according to claim 1 or 2, wherein the brine refrigerator is subjected to a plurality of times of vacuum cooling. The energy is generated by the brine refrigerator when the energy is operated at a leveled constant output and the vacuum cooling is not performed or when the vacuum cooling is performed in a state smaller than the leveled cooling energy. In order to store the cooling energy in the heat storage tank, the circulation of the brine by the second circulation pump is stopped or reduced, and when the vacuum cooling is performed in a state larger than the leveled cooling energy, The cold trap is cooled using both the cooling energy generated by the brine refrigerator and the cooling energy stored in the heat storage tank. A method of using a vacuum cooling device, comprising increasing the circulation of brine by a second circulation pump.