JP2002147913A - Device for measuring temperature of vacuum cooling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the temperature of to-be-cooled objects automatically stably by measuring the temperature of the objects indirectly without working for insertion of temperature sensor. SOLUTION: A cooling vessel 2 is provided for containing objects 1 to be cooled, an outside-air conducting line 5 is connected to the vessel 2, and a temperature detector 12 is provided in the water tank 11. Alternatively, the water tank 11 is provided in communication with the vessel 2 for containing objects 1, and the temperature detector 12 is provided in the tank 11. Further a heat exchanger 6 is provided in a vacuum suction line 4 in connection with the vessel 2. A cooling-water flowing line 6 is provided in the heat exchanger 6, and the outlet of the heat exchanger 6 in the line 16 is connected to the tank 11 with a makeup-water supply line 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature measuring device for a vacuum cooling device.

[0002]

2. Description of the Related Art As is well known, a vacuum cooling device is designed to reduce the saturated steam temperature and evaporate the water content of a cooling object by evacuating and reducing the pressure in a cooling tank containing the object to be cooled. Thus, the object to be cooled is cooled using the latent heat of vaporization at that time. This vacuum cooling device is used, for example, in the food industry in a process of packing and shipping cooked food.

In this vacuum cooling device, it is possible to insert a temperature sensor into the object to be cooled, check the cooling state of the object to be cooled based on a detection signal from the temperature sensor, and control the operation of the vacuum suction means. Is being done.

[0004] The operation of inserting the temperature sensor is a very complicated operation since an operator manually inserts the temperature sensor into the object to be cooled, and the operator sometimes forgets to insert the temperature sensor. Also,
Variations in the insertion depth cause differences in the measured temperatures.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to measure the temperature of an object to be cooled indirectly, to eliminate the need for inserting a temperature sensor, and to stabilize the temperature of the object to be cooled. And automatically measure.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is provided with a cooling tank for accommodating an object to be cooled. An introduction line is connected, a water tank is provided in the outside air introduction line, and a temperature detecting means is provided in the water tank.

[0007] The invention according to claim 2 further comprises a cooling tank for accommodating the object to be cooled, a water tank provided in communication with the cooling tank, and a temperature detecting means provided in the water tank. Provide a heat exchanger in the vacuum suction line connected to
The outlet side of the heat exchanger in the cooling water distribution line provided in the heat exchanger and the water tank are connected by a makeup water supply line.

[0008]

Next, an embodiment of the present invention will be described. The vacuum cooling device according to the present invention includes a cooling tank having a sealable door, and accommodates an object to be cooled in the cooling tank. A vacuum suction line and an outside air introduction line are connected to the cooling tank, a heat exchanger and vacuum suction means are provided on the vacuum suction line, and an outside air introduction means is provided on the outside air introduction line. The heat exchanger cools and condenses the steam in the exhaust gas by flowing the cooling water, thereby reducing the volume of the discharged gas. As the vacuum suction means, a vacuum pump, a steam ejector, a water ejector, or the like is used. Among these vacuum suction means, a plurality of kinds can be used in combination. As the outside air introducing means, a solenoid valve, a motor valve, or the like is used.

A relatively small capacity water tank is provided in communication with the cooling tank. This water tank is installed in the cooling tank, the outside air introduction line or the vacuum suction line. Further, a temperature detecting means is provided in the water tank. The amount of water in the water tank is set in consideration of the size, temperature, and specific heat (that is, heat capacity) of the object to be cooled. When the pressure in the cooling tank is reduced, water evaporates from the water surface of the water tank and the surface of the water absorbing member, and the temperature of the water in the water tank decreases in substantially the same manner as the object to be cooled. Therefore, the temperature of the object to be cooled can be indirectly measured by the temperature detecting means.

Here, the water tank is preferably installed in the outside air introduction line. By doing so, clean air always comes into contact with the water in the water tank, and the slag of the object to be cooled scattered in the cooling tank is not mixed into the water tank. is there.

Further, the water in the water tank is replaced every vacuum cooling operation. Further, in order to improve the accuracy of the temperature measurement, the temperature of the water in the water tank is heated to about the same as the initial temperature of the object to be cooled. As the heating means, an electric heater or the like is provided, and an outlet side of the heat exchanger in a cooling water distribution line provided in the heat exchanger and the water tank are connected by a makeup water supply line, Water heated by the exchanger is supplied to the water tank. According to this configuration, the amount of heat for heating the water in the water tank can be saved, which is economical.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. The vacuum cooling device according to the present invention includes a cooling tank 2 that stores an object 1 to be cooled. The cooling tank 2 is provided with a door (not shown) and has a sealable structure. A plurality of shelves 3 are detachably provided in the cooling tank 2, and the object 1 to be cooled is placed on the shelves 3. A vacuum suction line 4 and an outside air introduction line 5 are connected to the cooling tank 2.

The vacuum suction line 4 includes the cooling tank 2
From the side, heat exchanger 6, check valve 7 and vacuum pump 8
Is provided. The heat exchanger 6 has a function of flowing the cooling water to cool and condense the steam in the exhaust gas, thereby reducing the volume of the discharged gas. The check valve 7 functions to maintain a reduced pressure state in the cooling bath 1. The vacuum pump 8 is a water-sealed type in the illustrated embodiment,
Water is supplied to form a liquid ring inside, and the rotation of the liquid ring sucks and discharges gas.

In the outside air introduction line 5, a filter 9, an outside air introduction valve 10 and a water tank 1 are arranged in this order from the outside air introduction side.
1 is provided. The filter 9 removes dust, germs, and the like in the outside air introduced into the cooling tank 2. The outside air introduction valve 10 regulates the speed of the decompression by adjusting the flow rate of the air flowing into the cooling tank 2 through the outside air introduction line 5. In order to indirectly measure the temperature of the object 1 to be cooled, the water tank 10 stores water whose temperature and amount are set so as to have a heat capacity substantially equal to the heat capacity of one object 1 to be cooled. I have.

The water tank 11 has a temperature detecting means 12
Is provided. The temperature detecting means 12 uses a wet bulb temperature sensor 13 in the first embodiment, and a water absorbing member 14 having a water absorbing property extends from a temperature sensing part (reference numeral omitted) to a position below the water surface of the water tank 11. It is arranged. As the water absorbing member 14, a fibrous material such as cloth or a porous material such as sponge is used. Both the water and the steam come into contact with the temperature sensing portion by the function of the water absorbing member 14, and the surroundings of the temperature sensing portion are filled with saturated steam. Therefore, the water temperature (= water vapor temperature) is detected by the wet bulb temperature sensor 13, and based on the detected temperature, the pressure is calculated by the pressure calculating means 15 from the relationship between the saturation temperature and the saturated steam pressure stored in advance. I do.
These temperatures and pressures are displayed by appropriate display means.

The heat exchanger 6 has a cooling water flow line 1
A heat exchange is performed between the cooling water flowing through the cooling water distribution line 16 and the suction gas from the cooling tank 2. Thereby, the suction gas is cooled, while the water flowing through the cooling water flow line 16 is heated. The outlet side of the heat exchanger 6 in the cooling water flow line 16 and the water tank 11 are connected by a makeup water supply line 17, and a part of the water heated by the heat exchanger 6 is 11 is supplied. The makeup water supply line 17 is provided with a makeup water solenoid valve 18.
8 controls the supply of makeup water. The water tank 11 is provided with a heating means such as an electric heater (not shown), and the temperature of the water supplied to the water tank 11 via the makeup water supply line 17 is lower than the initial temperature of the object 1 to be cooled. If so, heat to a value close to this. The heating means may be provided in the makeup water supply line 17.

The water tank 11 has a discharge solenoid valve 19.
Is connected to the discharge line 20 provided with the. The water in the water tank 11 is automatically replaced for each vacuum cooling operation. The vacuum pump 8, the outside air introduction valve 1
0, the make-up water solenoid valve 18 and the discharge solenoid valve 1
9 is controlled by the controller 21 according to a preset program. The pressure calculating means 15 is provided in the controller 21. The inlet side of the heat exchanger 6 in the cooling water distribution line 16 and the vacuum pump 8 are connected by a sealed water supply line 22.

Next, the operation of the above configuration will be described. After the object to be cooled 1 is accommodated in the cooling tank 2 and the door (not shown) is closed, the operation switch is turned on to start the vacuum cooling step. The discharge solenoid valve 19 is opened to discharge the water in the water tank 11, and the discharge solenoid valve 1 is opened.
After closing 9, the make-up water solenoid valve 18 is opened to supply make-up water. After a predetermined amount of makeup water has been supplied, the makeup water solenoid valve 18 is closed. When the temperature of the water is lower than the initial temperature of the object 1 to be cooled, the water is heated by the heating means (not shown). Then, the inside of the cooling tank 2 is depressurized by operating the vacuum pump 8. At the same time, cooling water is supplied to the heat exchanger 6 through the cooling water flow line 16.

During the depressurization, the temperature of the object to be cooled 1 is indirectly measured by the wet bulb temperature sensor 13 to monitor whether or not vacuum cooling is being performed according to a program. Water evaporates from the water surface of the water tank 11 and the surface of the water absorbing member 14, and the temperature of the water in the water tank 11 decreases in substantially the same manner as the object 1 to be cooled. Further, the pressure in the cooling bath 2 is calculated based on the temperature detected by the temperature detecting means 12. Upon detecting that the pressure in the cooling tank 2 has decreased to a predetermined value, the vacuum pump 8 is stopped.
Then, the outside air introduction valve 10 is operated to allow the cooling tank 2 to operate.
The inside of the cooling bath 2 is restored by introducing clean outside air into the inside. After the pressure in the cooling tank 2 returns to the atmospheric pressure, the door is opened and the object 1 to be cooled is taken out.

FIG. 2 shows a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, a normal temperature sensor 23 is provided as the temperature detecting means 12 instead of the wet bulb temperature sensor 13.
The temperature sensing part of the temperature sensor 23 is directly immersed in the water tank 11. In terms of accuracy of temperature measurement, it is better to use the wet bulb temperature sensor 13 in the first embodiment. However, in the configuration of the second embodiment, the actual temperature of the object 1 and the temperature sensor If the difference between the detected temperature and the detected temperature is confirmed in advance by an experiment, it can be implemented.

[0021]

According to the present invention, the temperature of the object to be cooled can be measured indirectly, and the temperature of the object to be cooled can be measured stably and automatically. Therefore, the operation of inserting the temperature sensor as in the related art is unnecessary, and there is no variation in the measured temperature due to the insertion failure of the temperature sensor. Also, if a water tank is provided on the outside air introduction line,
Clean air is always in contact with the water in the water tank, and the slag of the object to be cooled scattered in the cooling tank is not mixed into the water tank, which is very sanitary. Further, the configuration in which a part of the water at the heat exchanger outlet side of the cooling water distribution line is supplied to the water tank can save the amount of heat for heating the water in the water tank, and is very economical. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 object to be cooled 2 cooling tank 4 vacuum suction line 5 outside air introduction line 6 heat exchanger 11 water tank 12 wet bulb temperature sensor 16 cooling water distribution line 17 makeup water supply line

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Kumi Matsuya, Inventor 7, Horiecho, Matsuyama-shi, Ehime Miura Kogyo Co., Ltd. (72) Inventor Seiya Tateishi 7, Horiecho, Matsuyama-shi, Ehime Miura Kogyo Co., Ltd. Terms (reference) 3L044 AA04 BA05 CA04 DD04 FA04 FA08 KA05 3L045 AA04 AA07 BA04 CA00 DA05 KA07 KA13 PA05

Claims (2)

[Claims] A cooling tank for accommodating an object to be cooled;
A temperature measuring device for a vacuum cooling device, characterized in that an outside air introduction line 5 is connected to the cooling tank 2, a water tank 11 is provided in the outside air introduction line 5, and a temperature detecting means 12 is provided in the water tank 11. 2. A cooling tank 2 for containing an object 1 to be cooled,
A water tank 11 is provided in communication with the cooling tank 2, a temperature detecting means 12 is provided in the water tank 11, and a heat exchanger 6 is provided in a vacuum suction line 4 connected to the cooling tank 2. An outlet side of the heat exchanger 6 in the cooling water flow line 16 provided in the water tank 11 and the water tank 11 are connected by a makeup water supply line 17.