JP2002122371A - Rotary cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary cooler which can prevent temperature irregularity by suppressing the pressure fluctuation within a cooling chamber. SOLUTION: An ejector 5 and a heat exchanger 6 are arranged within a roll 1. A coolant supply pipe 2 is connected to the inlet side of the ejector 5 and the heat exchanger 6, and a fluid discharge pipe 4 is connected to the outlet side. A suction pipe 18 is attached to the suction part 14 of the ejector 5. Vapor, which is supplied to the cooling chamber 11 and is evaporated, is changed into condensed liquid, being cooled with the heat exchanger 6. This condensed liquid, the evaporated vapor having remained without being condensed, and a part of the coolant having remained without being evaporated is sucked in the pipe 18, and is mixed and it reaches a tank 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cooling an object to be cooled at a relatively low temperature by setting the inside of a rotary cooling device to a low pressure state by suction means.

[0002]

2. Description of the Related Art As a conventional rotary cooling device, for example, one disclosed in Japanese Patent Application Laid-Open No. 6-238677 has been used. It comprises a roll having a rotating part, a coolant supply part for supplying a coolant to the inside of the roll, and a coolant discharge part comprising a siphon pipe and suction means for discharging the coolant from the inside, and the roll By evaporating and evaporating the cooling liquid inside, the object to be cooled is vaporized and cooled with a large heat transmission rate, and the occurrence of cooling unevenness can be prevented.

[0003]

However, even with the above-mentioned conventional rotary cooling apparatus, there has been a problem that it is not possible to reliably prevent uneven cooling. This is because, when the vaporized vapor of the cooling liquid inside the roll is sucked by the suction means through the siphon pipe and the cooling liquid discharge pipe, the amount of vaporized vapor generated fluctuates due to the small diameter of these pipes. If it increases, the pipe resistance increases, and the increased amount of vaporized steam cannot be reliably sucked, the pressure inside the roll fluctuates, and as a result, the temperature inside the roll fluctuates and cooling unevenness occurs. It is.

In view of this situation, an object of the present invention is to minimize the pipeline resistance from the inside of a rotary cooling device to a suction means without increasing the pipeline diameter and to condense vaporized vapor inside the cooling device. Accordingly, it is an object of the present invention to provide a rotary cooling device capable of suppressing pressure fluctuations in a cooling chamber and preventing cooling unevenness.

[0005]

A cooling chamber for cooling an object to be cooled and a cooling fluid supply pipe for supplying a cooling fluid to the cooling chamber are connected, and the cooling chamber communicates with suction means.
The suction means is formed by at least an ejector, the ejector is arranged in the cooling chamber, the inlet side of the ejector is connected to the cooling fluid supply pipe, the outlet side of the ejector is connected to the cooling fluid discharge pipe, and the cooling chamber is cooled. The heat exchanger communicated with the fluid supply pipe is arranged.

By disposing the ejector in the cooling chamber, there is no need to connect the cooling chamber and the ejector as suction means with a siphon pipe or a communication pipe, and the pipe resistance between them is minimized. can do.

[0007] By connecting the inlet side of the ejector to the cooling fluid supply pipe and connecting the outlet side of the ejector to the cooling fluid discharge pipe, the fluid in the cooling chamber sucked by the ejector flows down from the inlet to the outlet of the ejector. While being mixed with the cooling fluid and discharged from the fluid discharge pipe to the outside.

A part of the vaporized vapor generated by the vaporization of the cooling fluid in the cooling chamber is cooled by the heat exchanger and condensed and liquefied, and the vaporized vapor remaining without being condensed is sucked by the ejector and mixed with the cooling fluid. The condensed water is reduced in volume and discharged from the fluid discharge pipe to the outside.

As described above, the large-volume vaporized vapor is condensed and discharged as a small-volume liquid to the outside of the cooling chamber without being directly discharged from the inside of the cooling chamber. Need not be large, and the pipeline resistance can be small,
Pressure fluctuations in the cooling chamber can be suppressed to prevent uneven cooling.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, an example is shown in which a roll 1 is used as a rotary cooling device. In FIG.
A rotatable roll 1, a cooling fluid supply pipe 2, a cooling fluid discharge pipe 4, an ejector 5 and a heat exchanger 6 arranged inside the roll 1 constitute a rotary cooling device.

The roll 1 has a hollow cylindrical shape and is provided with rotary joints 9 and 10 at the left and right central portions. The rolls 1 are arranged so that the roll 1 can rotate continuously about the rotary joints 9 and 10. An object to be cooled (not shown) is cooled by contacting the outer surface of the roll 1.

The inside of the hollow cylindrical roll 1 is cooled by a cooling chamber 11.
And the ejector 5 is arranged. The ejector 5 includes a suction unit 14 having a nozzle (not shown) and a diffuser 16. The suction unit 14 as the inlet side of the ejector 5
The cooling fluid supply pipe 2 is connected via the communication pipe 13.

A pipe 18 is attached to the suction section 14 of the ejector 5. The lower end opening 20 of the pipe 18 is
Are arranged on the inner circumference with a slight gap.

A coil-shaped heat exchanger 6 is arranged inside the cooling chamber 11 in parallel with the ejector 5. The inlet side of the heat exchanger 6 is also connected to the cooling fluid supply pipe 2 via the communication pipe 13.
A part of the communication pipe 13 extending to the ejector 5 and the heat exchanger 6 is branched and cooling fluid injection nozzles 21 and 22 are attached.

The cooling fluid jet nozzles 21 and 22 transfer a part of the cooling fluid supplied from the cooling fluid supply pipe 2 to the roll 1.
The object to be cooled (not shown) on the outer circumference of the roll 1 is cooled by injecting the inner circumference.

The diffuser 16 as the outlet side of the ejector 5 and the outlet side of the heat exchanger 6 are connected to the cooling fluid discharge pipe 4 through a communication pipe 23. The cooling fluid discharge pipe 4 is connected to the suction part 24 of the fluid circulation pump 8 via the tank 7. The discharge part 25 of the fluid circulation pump 8 is connected to the cooling fluid supply pipe 2.

At the top of the tank 7, a cooling fluid supply pipe 26
And the overflow pipe 27 is connected.
The fluid circulation pump 8 suctions the fluid in the tank 7 and discharges the fluid to the cooling fluid supply pipe 2.

When the object to be cooled is cooled on the outer surface of the roll 1, the fluid circulation pump 8 is driven while rotating the roll 1, and the cooling fluid injection nozzle 21,
A cooling fluid is supplied into the roll 1 via 22.

The remaining cooling fluid is supplied to the ejector 5 and the heat exchanger 6
Supplied to The suction unit 14 of the ejector 5 generates a suction force. Since the suction force is determined by the temperature of the cooling fluid flowing down in the ejector 5, the suction force can be adjusted by appropriately controlling the fluid temperature. By setting the fluid temperature to 100 ° C. or higher, the pressure can be set to a pressure higher than the atmospheric pressure, or by setting the fluid temperature to 100 ° C. or lower, the pressure can be reduced to the atmospheric pressure or lower.

The internal pressure of the cooling chamber 11 is substantially equal to the pressure generated in the ejector 5. When the internal pressure of the cooling chamber 11 is reduced to the atmospheric pressure or lower, the supplied cooling fluid takes away the heat of the object to be cooled and immediately evaporates, thereby cooling the object to be cooled to a temperature of 100 ° C. or less. Is done.

The vapor that has been deprived of heat and vaporized is cooled by the heat exchanger 6 and partially condensed. As the vaporized steam in the cooling chamber 11 is condensed in the heat exchanger 6 in this manner, the convective circulation of the vaporized steam in the cooling chamber 11 is promoted, and the roll 1
By evaporating and evaporating the cooling fluid near the inner peripheral surface, the efficiency of evaporative cooling can be increased.

The liquid condensed in the heat exchanger 6, the vaporized vapor remaining without being condensed, and the roll 1 without vaporization
The cooling fluid located inside the pipe 18 of the ejector 5
The vaporized vapor is condensed into a liquid from the cooling fluid discharge pipe 4 to the tank 7.

By disposing the lower end opening 20 of the pipe 8 at a small distance on the inner periphery of the roll 1,
The film thickness of the cooling fluid on the inner circumference can be made equal to this distance and constant, and the cooling temperature of the entire roll 1 can be maintained uniform.

In the present embodiment, an example is shown in which the heat exchanger 6 is arranged above the cooling chamber 11 in parallel with the ejector 5, but the heat exchanger 6 may be arranged in series with the ejector 5, Alternatively, the cooling chamber 11 may be divided into a plurality of parts and distributed and arranged inside the cooling chamber 11.

Further, in this embodiment, the cooling fluid injection nozzles 21 and 22 for injecting the cooling fluid into the cooling chamber 11 are provided in the communication line 13, but the injection holes are directly formed in the communication line 13. May be provided for injection. Further, this injection hole can be provided in the communication pipe 23 on the outlet side of the ejector 5.

Further, in this embodiment, one example of the pipe 18 provided in the ejector 5 is shown, but a plurality of pipes 18 may be provided.

In this embodiment, an example using the tank 7 and the fluid circulation pump 8 has been described. However, if a cooling fluid at a predetermined temperature can be supplied to the ejector 5 and the heat exchanger 6, the tank 7 The circulation pump 8 is not always necessary.

A separate indirect heat exchanger may be provided in place of the tank 7, and the temperature of the cooling fluid supplied to the ejector 5 and the heat exchanger 6 may be appropriately adjusted.

Further, in this embodiment, the example in which the cooling temperature is 100 ° C. or less is shown. However, by setting the pressure generated in the ejector 5 to the atmospheric pressure or more, the cooling temperature of 100 ° C. or more can be obtained. You can also.

[0030]

According to the present invention, by arranging the ejector and the heat exchanger in the cooling chamber, the pipe resistance from the cooling chamber to the ejector as the suction means can be made almost zero, and the inside of the cooling chamber can be reduced. Vaporized steam can be condensed by the heat exchanger, and pressure fluctuation in the cooling chamber can be suppressed to prevent uneven cooling.

[Brief description of the drawings]

FIG. 1 is a partial sectional configuration view showing an embodiment of a rotary cooling device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll 2 Cooling fluid supply pipe 4 Cooling fluid discharge pipe 5 Ejector 6 Heat exchanger 8 Fluid circulation pump 11 Cooling chamber 13 Communication pipe 14 Suction part 18 Pipe 21 and 22 Cooling fluid injection nozzle 23 Communication pipe

Claims (1)

[Claims] 1. A cooling chamber for cooling an object to be cooled, a cooling fluid supply pipe for supplying a cooling fluid to the cooling chamber, and the cooling chamber connected to a suction means, wherein the suction means is formed by at least an ejector. And disposing the ejector in a cooling chamber, connecting the inlet side of the ejector to a cooling fluid supply pipe,
Connect the outlet side of the ejector to the cooling fluid discharge pipe,
A rotary cooling device, wherein a heat exchanger communicating with a cooling fluid supply pipe is disposed in a cooling chamber.