JPH11170338A - Roll heating/cooling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an apparatus using water as a heating medium and regulating the temp. of a roll within a range from below 100 deg.C to 100 deg.C or higher. SOLUTION: A water channel 3a for the heat exchange of a roll 3, a circulating pump 4, the secondary side 5a of a heat exchanger 5 for heating and the secondary side 6a of a heat exchanger 6 for cooling are provided on the way of a circulating water channel 2 and the ejection side 7a of a pressure water supply pump 7 is connected to the circulating water channel 2. According to circumstances, the bypass water channel 5c connecting the inflow port and outflow port on the secondary side 5a of the heat exchanger 5 for heating and the bypass water channel 6c connecting the inflow port and outflow port on the secondary side 6a of the heat exchanger 6 for cooling are provided. A pressure regulating valve 16 is connected to the ejection side 7a of the pressure water supply pump 7 and, during the operation of the circulating pump 4 in such a state that the circulating water flowing through the circulating water channel 2 becomes 100 deg.C or higher, the pressure water supply pump 7 is operated if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a roll (also referred to as a roller or a drum) having a temperature of less than 100.degree.
The present invention relates to a roll heating / cooling apparatus for controlling the temperature in a range of not less than ° C.

[0002]

2. Description of the Related Art In an apparatus for casting a film, an endless steel belt for casting is stretched with a roll, and the steel belt is heated at a temperature lower than 100 ° C. to 1 °.
Some rolls are heated and cooled so as to adjust to a set temperature within a range of 00 ° C. or more. A conventional roll heating / cooling device provided for heating / cooling the roll is configured to supply a heat-regulated heat medium oil to a heat exchange channel formed in the roll.

[0003]

However, in a heating / cooling apparatus for a roll using a heating medium oil, when the heating medium oil leaks, there is a danger of a fire explosion due to the heating medium oil in a high temperature state, and a casting apparatus is installed. Therefore, there is a problem that the cleanliness in the factory, which requires a high cleanliness, is significantly reduced. Further, the heat transfer medium oil may not be able to heat or cool the roll quickly and uniformly due to poor heat transferability. Therefore, an object of the present invention is to provide a heating and cooling device for a roll using water as a heat medium in order to solve the above problem.

[0004]

In order to heat and cool the roll by using water as a heat medium, a means adopted by the present invention according to the first aspect of the present invention includes a water exchange passage for heat exchange of the roll,
A heating / cooling device for rolls, comprising a circulation pump, a secondary side of a heat exchanger for heating and a secondary side of a heat exchanger for cooling, and a discharge side of a pressurized water supply pump connected to a circulation channel. . In the present invention, since the circulating water flowing through the circulating water channel can be pressurized to 1 atm or more by the pressurized water supply pump, the circulating water passing through the secondary side of the heating heat exchanger is heated to 100 ° C or more. And circulating water passing through the secondary side of the heat exchanger for cooling while circulating to the heat exchange water passage of the roll.
After cooling to less than 00 ° C., the rolls can be circulated to the heat exchange water passage. The heat transfer property of the circulating water is better than that of the heat transfer oil, so the roll can be heated or cooled quickly and uniformly, and even if the circulating water leaks, there is no danger of flaming explosion and the cleanliness Is not significantly reduced.

In order to uniformly heat or cool the roll by increasing the amount of circulating water per unit time, the means adopted by the invention according to the present invention is arranged such that the heating heat exchanger has a secondary inlet side. The heating / cooling device for a roll according to claim 1, further comprising: a bypass water passage connecting the cooling water heat exchanger and a bypass water passage connecting the inlet side and the outlet side of the secondary side of the cooling heat exchanger. It is. In the present invention, since the circulating water passes through each secondary side and each bypass water channel of the heating heat exchanger and the cooling heat exchanger, the heat of the rolls does not decrease without reducing the amount of circulating water per unit time. The roll can be heated or cooled uniformly by passing a large amount of circulating water through the replacement water passage.

In order to prevent the temperature fluctuation of the circulating water due to the water pressure fluctuation, the means adopted by the present invention is to connect a pressure regulating valve to the discharge side of the pressurized water supply pump, and to connect the circulating water passage to the pressure regulating valve. 3. The roll heating / cooling apparatus according to claim 1, wherein the pressurized water supply pump is operated while the circulating pump is operated in a state where flowing circulating water is 100 ° C. or higher. In the present invention, since the water pressure set by the pressure regulating valve is constantly applied to the circulating water, the temperature fluctuation of the circulating water due to the fluctuation of the water pressure can be eliminated.

According to the present invention, in order to prevent the circulating water from flowing out of the apparatus, the suction side of the pressurized water supply pump is connected to a water supply tank. In some cases, a safety valve is connected to the circulation channel, and each drain side of the safety valve and the pressure control valve is connected to the water supply tank.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a roll heating / cooling apparatus according to the present invention will be described based on an embodiment shown in the drawings.

The heating / cooling device 1 for a roll is provided with a roll (also referred to as a roller or a drum) in the middle of the circulation channel 2.
3 is provided with a heat exchange water passage 3a, a circulation pump 4, a secondary side 5a of a heating heat exchanger 5 and a secondary side 6a of a cooling heat exchanger 6, and discharges a pressurized water supply pump 7 into the circulation water passage 2. Side 7a is connected. The roll 3 is an endless steel belt 8 for casting a synthetic resin film or the like.
Is stretched by a pair with a roll (not shown) of the other party, and is forcibly driven or rotated following the running of the belt 8. Running steel belt 8
Is cooled or heated in a process before reaching the roll 3,
When the roll 3 contacts the roll 3 in this state, the roll 3 heats or cools the roll 3 to a predetermined temperature. The roll 3 forms a heat exchange water passage 3a inside, and is heated or cooled by the temperature adjusting circulating water passing through the heat exchange water passage 3a, so that the temperature of the outer peripheral surface 3b of the steel belt 8 is increased. The temperature is set to a temperature suitable for heating or cooling (for example, 50 to 130 ° C.). The rotating roll 3 is connected to the pipe 2 of the circulation waterway 2.
A water exchange passage 3a for heat exchange is connected to a through a rotary joint 9 for piping.

The heating heat exchanger 5 is provided with a heat exchanging section comprising a pipe or the like serving as a primary side 5b inside a pressure vessel serving as a secondary side 5a, and a steam passing through the heat exchanging section on the primary side 5b. The circulating water is heated by exchanging heat with the circulating water passing through the pressure vessel on the secondary side 5a. In addition, the cooling heat exchanger 6 is provided with a heat exchange section including a pipe or the like serving as a primary side 6b inside a pressure vessel serving as a secondary side 6a, and a cooling water passing through the heat exchange section on the primary side 6b. The circulating water is cooled by exchanging heat with the circulating water passing through the pressure vessel on the secondary side 6a. Either of the locations where the heating heat exchanger 5 and the cooling heat exchanger 6 are provided in the circulating water channel 2 may be on the upstream side. The heating heat exchanger 5 and the cooling heat exchanger 6 are provided on the discharge side 4 a of the circulation pump 4, but may be provided on the suction side 4 b of the circulation pump 4.

The heating heat exchanger 5 and the cooling heat exchanger 6 are provided with bypass water passages 5c, 6c connecting the inlets and outlets of the secondary sides 5a, 6a, respectively. The amount of circulating water is increased. When the amount of circulating water passing through the internal heat exchange water passage 3a increases, the roll 3 quickly or uniformly heats or cools the entire outer peripheral surface 3a. Each of the bypass water passages 5c and 6c is provided with a flow control valve 12 so that the amount of water passing through the bypass water passages 5c and 6c can be adjusted.

The circulating water passage 2 is provided with a temperature control device 1 at a location downstream of the heating heat exchanger 5 and the cooling heat exchanger 6.
A temperature detector 11 of 0 is provided to detect the temperature of the circulating water heated or cooled after passing through the heat exchanger 5 for heating and the heat exchanger 6 for cooling. The heating heat exchanger 5 and the cooling heat exchanger 6 are provided with flow control valves (temperature control valves) 13 and 14 of the temperature control device 10 on the respective primary sides 5b and 6b. When the temperature controller 10 outputs the temperature detected by the temperature detector 11 to the temperature controller 12, the temperature controller 12 issues a command based on the difference between the set temperature and the detected temperature to the flow control valve 13,
14 and the temperature of the circulating water supplied to the roll 3 is set to the set temperature.

The pressurized water supply pump 7 has a discharge side 7a connected to a portion of the circulating water channel 2 which is the suction side 4b of the circulating pump 4. The pressurized water supply pump 7 includes a check valve 15 for preventing backflow toward the pump 7, a pressure control valve 16 for setting a pressure of water supplied to the circulating water passage 2, and a water supply tank 17. The waterway 18 is formed. The water supply tank 17 includes a tank body 18, a ball tap 19 for maintaining a constant water level WL in the tank, and an overflow pipe 2.
0. When the circulating pump 4 is operated in a state where the circulating water is at 100 ° C. or higher, the pressurized water supply pump 7 is always operated to secure a minimum necessary water pressure according to the temperature of the circulating water. The fluctuation of the temperature of the circulating water due to the fluctuation is prevented.

The circulating water channel 2 is provided with a safety valve 19 at a position near the inflow side of the roll 3 so as to prevent the pressure from rising above the dangerous pressure. The safety valve 19 connects the drainage channel side 19a to the inside of the tank body 18 of the water supply tank 17 so as to prevent circulating water leaking from the circulating water channel 2 from flowing out of the device. The circulation channel 2 is provided with an air vent valve 20 at an appropriate position so that air does not enter the channel. This is because the heat conductivity is extremely different between water and air, so that air is eliminated to ensure stable heat exchange capacity of the circulating water.

The heating / cooling device 1 for a roll can pressurize the circulating water flowing in the circulating water channel 2 to 1 atm or more by the pressurized water supply pump 7, so that the circulating water passing through the secondary side 5 a of the heating heat exchanger 5 can be used. Can be heated to 100 ° C. or higher and circulated to the heat exchange water passage 3 a of the roll 3. Further, the roll heating / cooling device 1 can cool the circulating water passing through the secondary side 6 a of the cooling heat exchanger 6 to less than 100 ° C. and circulate the circulating water to the heat exchange water passage 3 a of the roll 3. . Furthermore, the heating / cooling device 1 for a roll can also raise or lower the temperature of the circulating water continuously or stepwise between less than 100 ° C. and 100 ° C. or more. The circulating water can heat or cool the roll 3 quickly and uniformly because the heat transfer property is better than that of the heat transfer oil, and furthermore, even if it leaks, there is no danger of flaming explosion and the cleanliness level is improved. There is no significant reduction.

The roll 3 of the roll heating / cooling apparatus 1
The present invention is not limited to the method in which the endless steel belt 8 is stretched, but is applied to a method in which a sheet such as a synthetic resin film or a metal foil is guided while being in contact with the outer peripheral surface 3a, and the sheet is heated or cooled. Of course, it is also possible.

[0017]

According to the first aspect of the present invention, the temperature of the roll is adjusted by circulating pressurized water having better heat transferability than the heat transfer medium oil to the heat exchange water passage of the roll, so that the roll can be moved quickly and quickly. It can be uniformly heated or cooled, and has an excellent effect that, even if circulating water leaks, there is no danger of ignition explosion and the cleanliness in the factory is not significantly reduced. In the apparatus according to the second aspect of the present invention, the roll can be heated or cooled uniformly by passing a large amount of circulating water through the heat exchange water passage of the roll. According to the third aspect of the present invention, the temperature of the circulating water does not fluctuate due to the fluctuation of the water pressure, and stable temperature control can be performed.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an embodiment of a roll heating / cooling apparatus according to the present invention.

[Explanation of symbols]

2. Circulating water channel, 3 ... Roll, 3a ... Heat exchange water channel, 4
... Circulation pump, 5 ... Heat exchanger for heating, 5a ... Secondary side, 5
c: bypass water passage, 6: heat exchanger for cooling, 6a: secondary side, 6c: bypass water passage, 7: pressurized water supply pump, 7a ...
Discharge side, 16 ... Pressure control valve

Claims (3)

[Claims] 1. A water supply passage for heat exchange of a roll, a circulation pump, a secondary side of a heat exchanger for heating and a secondary side of a heat exchanger for cooling are provided in the middle of the circulation water passage. A heating / cooling device for a roll, wherein a discharge side of a pump is connected. 2. A bypass channel connecting an inlet and an outlet on the secondary side of the heat exchanger for heating, and an inlet and an outlet on the secondary side of the heat exchanger for cooling. The heating / cooling device for a roll according to claim 1, further comprising: a bypass water passage that connects the rolls. 3. A pressure regulating valve is connected to a discharge side of the pressurized water supply pump, and the circulating pump is operated under a condition that circulating water flowing through the circulating water channel is 100 ° C. or more, and 2. The pressurized water supply pump is operated.
Or the heating and cooling device for a roll according to 2.