JP2932905B2 - Operating method of vacuum cooling device and device therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooked food.
The present invention relates to an operation method of a vacuum cooling device for cooling a device and the like and improvement of the device.

[0002]

2. Description of the Related Art For example, a vacuum cooling device as shown in FIG. 3 is known as a device for cooling cooked food in a short time. In this vacuum cooling device, a can body 31 for accommodating an object to be cooled, and a water ring vacuum pump 33 connected to the can body 31 via a suction path 32, and a cold trap 34 inserted in the middle of the suction path 32 doing. Cold water tank 36
Has a chilled water unit 35, and the chilled water tank 3
A cooling water circulation path 37 is provided between the cold water trap 6 and the cold trap 34, and a circulation pump 38 is inserted in the cooling water circulation path 37.
Supply cooling water to the cold trap 34
I do. Further, a water supply path 39 for supplying water to the water ring vacuum pump 33 is connected by branching from the middle of the cooling water circulation path 37, and the used water is supplied to the cold water through a drain line 40. It is configured to return to the tank 36. Then, the object to be cooled (for example, lunch for lunch) is transferred to the can body 31.
And the water ring vacuum pump 33 is driven to drive the can 31
By reducing the pressure in the inside, the moisture contained in the object to be cooled is evaporated at the saturation temperature, and latent heat is taken from the object to be cooled to cool it. The cold trap 34 is provided between the can body 31 and the water-sealed vacuum pump 33 to increase the efficiency of vacuum cooling by condensing the negative pressure steam in the suction passage 32. The cold water unit 35
Is connected to the cold water tank 36 via the cold water circulation path 41.
It is necessary to circulate cold water with the cold water tank 36.
Thus, the temperature of the cold water in the cold water tank 36 is set to a predetermined temperature and supplied to the cold trap 34 via the cooling water circulation path 37 to further promote the condensation of the negative pressure steam.

By the way, in the vacuum cooling device having the above configuration,
For example, when cooling 150 kg of an object to be cooled in one batch, the capacity of the refrigerator of the chilled water unit 35 is 15 HP,
Since the capacity of the chilled water tank 36 is required to be 1 m ³ , the electricity cost is increased and the installation space is increased. Ma
Also, the temperature of the object to be cooled stored in the can
If cooling Luo to a predetermined temperature 21 ° C., changes in temperature is as shown in the cooling performance curves of Figure 2, quickly take away that about 75% of the heat to the object to be cooled the temperature is lowered to 35 ° C. become. Further, in the initial stage of the cooling, a sudden vacuum state occurs, so bumping occurs, and a part of the object to be cooled scattered due to the bumping may be sucked.

[0004]

SUMMARY OF THE INVENTION This invention is to be solved
SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum cooling device operating method and a device thereof, which enable downsizing of a cold water unit and a cold water tank of the vacuum cooling device .

[0005]

The present invention solves the above problems.
The invention according to claim 1 has been made to solve the problem.
Connects the suction path to the can body for accommodating the object to be cooled, provided with a cold trap in the middle of the suction passage, the vacuum cooling device formed by inserting the cooling water circuit in this <br/> cold trap In the initial cooling stage after the start of operation,
Supply normal-temperature water to the cooling water circuit, and after the initial cooling stage,
Vacuum cooling characterized by supplying cold water to the cooling water circuit
The invention according to claim 2 is a method of operating a cooling device, wherein a suction path is connected to a can body for storing an object to be cooled, a cold trap is provided in the middle of the suction path, and cooling is performed in the cold trap. Vacuum cooling device with water circuit inserted
In this cooling water circuit, the initial cooling stage after the start of operation
Room temperature water supply path to supply room temperature water to the floor, and after the initial cooling stage
And a cooling water supply path for supplying cold water to the vacuum cooling device.

[0006]

According to the present invention, after starting operation of the vacuum cooling device,
Initial stage of cooling of
While the temperature drops to room temperature).
After the supply and cooling initial stage, the cooling water is supplied into the cold trap, so that the cooling efficiency can be improved.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. Figure 1 is an explanatory view of a schematic structure of a vacuum cooling apparatus embodying the present invention, the vacuum cooling apparatus
Is a can 1, which contains the object to be cooled, a cold trap 2,
Water-sealed vacuum pump 3, chilled water tank 4, and chilled water unit 5
It has. A suction path 6 is provided between the can 1 and the water ring vacuum pump 3, and the cold trap 2 and the first check valve 7 are inserted in the suction path 6 . A cooling water circuit 2a for exchanging heat with negative pressure steam is inserted into the cold trap 2 , one end of a cooling water supply passage 8 is connected to an inlet of the cooling water circuit 2a, and the other end is the cold water tank. 4 is connected to the lower part . In the middle of the cooling water supply path 8 ,
First circulation pump 9, first solenoid valve 10, first flow control valve 1
The first and second check valves 12 are inserted. In addition, the cold
The second check valve 12 and the cold trap 2 of the recirculating water supply passage 8
One end of the room-temperature water supply path 13 is connected between them. This
The other end of the room temperature water supply path 13 is connected to a room temperature water supply section 14 (well
Water, tap water, Yes to connect to the industrial water), this room temperature water supply
A second solenoid valve 15, a second flow control valve 16, and a third check valve 17 are inserted in the middle of the supply path 13 . Further, a water supply path 19 having a third solenoid valve 18 is provided in the normal temperature water supply path 13 in a branched manner so that the cold water tank 4 is supplied with water.

On the other hand, between the outlet of the cooling water circuit 2a in the cold trap 2 and the cold water tank 4 , a cooling water recirculation path 20 is provided. The pump 3 and the electromagnetic three-way valve 21 are inserted, and this cooling water is used as water sealing of the water ring vacuum pump 3. A drain 22 is connected to a one-way port of the electromagnetic three-way valve 21. A cold water circulation path 23 is provided between the cold water tank 4 and the cold water unit 5, and a second circulation pump 24 is inserted in the middle of the cold water circulation path 23.
The chilled water unit 5 includes a refrigerator (not shown) and a heat exchange unit.
(Not shown), and cools the water in the cold water tank 4 to a predetermined temperature via the heat exchange unit. Here, shown in FIG.
In the embodiment, a drain line 25 is provided in the cold water tank 4.
Is connected. Further, the can body 1 has a sterilizing filter.
26 is connected via an air supply path 27, and this air supply path 2
The fourth solenoid valve 28 is inserted in the middle of 7. Furthermore, before
The can 1 has a temperature sensor 29 for detecting the temperature inside the can.
Connected. In addition, the water ring vacuum pump 3, cold water
Unit 5, each solenoid valve 10, 15, 18, 28, solenoid type
Three-way valve 21, temperature sensor 29, and circulating pumps 9, 2
Reference numeral 4 denotes a controller (not shown) via a communication line (not shown).
Yes it communicates with substantially), a timer in the controller.

Next, an operation method and an operation of the vacuum cooling device having the above configuration will be described. Here, before the start of operation , each of the solenoid valves 10, 15, 18, and 28 is in a closed state. First,
As a preparation work, the third electromagnetic valve 18 is opened, a predetermined amount of water is supplied to the chilled water tank 4, the third electromagnetic valve 18 is closed, and then the second circulation pump 24 is driven and the chilled water unit 5 is operated. To supply cold water to the cold water tank 4. Thereafter, the object to be cooled is accommodated in the can 1, and the door is closed and hermetically closed, and then the second solenoid valve 15 is operated by a signal from a controller (not shown).
Is opened and the water ring vacuum pump 3 is driven. Soshi
Then , the valve communicating with the drainage channel 22 of the electromagnetic three-way valve 21 is opened and the other valve is closed. In this state, the can body temperature detected by the temperature sensor 29 for a predetermined time set in advance.
Degrees is operated to reach a predetermined temperature. That is, as illustrated in the can body cooling performance curves of Figure 2, initially the object to be cooled temperature
Before cooling from 76 ° C to about 35 ° C for less than 3 minutes,
Room temperature water is supplied to the cooling water circuit 2 a of the cold trap 2, and the room temperature water is used as the water sealing of the water ring vacuum pump 3.
After use, the water is drained from the drainage channel 22 . This is about 7% of the amount of heat required to cool the object to be cooled to a predetermined temperature (21 ° C.).
Will be depriving 5%, also, since the sudden vacuum in the cooling early stage, a portion of the object to be cooled scattered by bumping is sucked, contaminated since the cooling water is contaminated cooled This is to drain the water.

After a lapse of a predetermined time, the second solenoid valve 1
5, the first circulating pump 9 of the cooling water supply passage 8 is driven, and the first solenoid valve 10 is opened. Cooling water of a predetermined temperature is supplied into the cold trap 2 to exchange heat, and the object to be cooled is cooled to a predetermined temperature. Cool to temperature. When supplying this cooling water,
Since a part of the object to be cooled scattered by the bumping is not sucked, the cooling water is circulated and used. That is, the electromagnetic
The valve connected to the drain passage 22 of the three-way valve 21 is closed, and the valve connected to the cold water tank 4 is opened to allow the cooling water to reflux. this is,
This is because it is difficult to remove the remaining 25% of the heat by cooling with the normal-temperature water, and requires cold water (about 10 ° C.).
Further, since cold water is supplied to the sealed water of the water-sealed vacuum pump 3, the capacity is increased and cooling is promoted.

As described above, when the object to be cooled is cooled to a predetermined temperature, the controller operates the water ring vacuum pump 3 and the second pump .
The operation of the one- circulation pump 9 is stopped, and the first solenoid valve 10 and the electric
Close the magnet type three-way valve 21, supply passageway opens the fourth solenoid valve 28
Clean air from canister 27 through sterilization filter 26
When the pressure in the can 1 is restored, the door is opened and the object to be cooled is taken out to complete the cooling.

According to the vacuum cooling apparatus and the operation method having the above-described configurations, the initial stage of cooling the object to be cooled (about 75% cooling, about 35% cooling).
° C), normal-temperature water is supplied to the cooling water and the remaining 25% of the cooling water is used as the cooling water. Therefore, a conventional large-sized cold water tank (1 m ³ ) or a large-capacity refrigerator (15H
P) does not require a small cold water tank (0.3m ³ )
A small-sized refrigerator (about 5HP) can sufficiently cope with the problem.

[0013]

According to the present invention, the cooling water to be supplied into the cold trap of the vacuum cooling device is separated from normal temperature water and cold water.
It can be replaced and supplied at the initial cooling stage (for a predetermined time
Inside or while the temperature in the can falls to a predetermined temperature).
Supply hot water and supply cold water after the initial cooling stage.
Therefore, the size of the cold water tank and the refrigerator used in the vacuum cooling device can be reduced as compared with the conventional one , and the initial cost and running cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a schematic structure of a vacuum cooling device embodying the present invention.

FIG. 2 is an explanatory diagram showing a cooling performance curve in a can body.

FIG. 3 is an explanatory diagram of a schematic structure of a conventional vacuum cooling device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Can body 2 Cold trap 2a Cooling water circuit 3 Water-sealed vacuum pump 4 Cold water tank 5 Cold water unit 6 Suction path 8 Cooling water supply path 9 First circulation pump 10 First solenoid valve 11 First flow regulating valve 12 Second reverse Stop valve 13 Room temperature water supply path 15 Second solenoid valve 16 Second flow control valve 17 Third check valve 20 Cooling water return path 21 Electromagnetic three-way valve 22 Drainage path

Claims (2)

(57) [Claims] 1. A suction path 6 is provided in a can body 1 for storing an object to be cooled.
Connect, provided with a cold trap 2 in the middle of the suction passage 6, the vacuum cooling device formed by inserting the cooling water circuit 2a to the cold trap 2, after the start of operation
In the initial cooling stage, room temperature water is supplied to the cooling water circuit 2a.
After the initial stage of cooling, the cooling water circuit 2a
The method for operating a vacuum cooling device, characterized in that : 2. A suction passage 6 is provided in the can body 1 containing the object to be cooled.
Connect, provided with a cold trap 2 in the middle of the suction passage 6, the vacuum cooling device formed by inserting the cooling water circuit 2a to the cold trap 2, the cooling water
Room temperature water is supplied to the circuit 2a in the initial cooling stage after the start of operation
Cold water supply path 13 to supply cold water after the initial cooling stage
And a cooling water supply passage 8 connected to the vacuum cooling device.