JP4249325B2 - Evaporative cooling device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for evaporating and cooling an object to be cooled by latent heat of vaporization of a cooling fluid while sucking the cooling chamber with suction means, specifically, a reactor cooling device for performing various reactions such as polymerization and condensation, The present invention relates to a cooling device for food and medical products. These objects to be cooled often change in quality due to slight temperature changes, and high-precision temperature control is required.
[0002]
[Prior art]
A conventional evaporative cooling device is disclosed in, for example, Japanese Patent Laid-Open No. 10-2647. This includes a suction means composed of an ejector 3, a tank 4 and a circulation pump 5, a jacket part 2 as a vaporization cooling chamber communicating with the suction means, and a cooling fluid supply passage 9 for injecting a cooling fluid into the jacket part 2. The object to be cooled is vaporized and cooled by the latent heat of vaporization of the cooling fluid in the jacket portion 2, the heat exchanging means 7 is attached in the tank 4, and the fluid temperature in the tank 4 is heated by the heat exchanging means 7. The cooling temperature can be changed without a time delay by adjusting the suction force generated in the ejector 3 by exchanging and adjusting to a predetermined value.
[0003]
[Problems to be solved by the invention]
In the case of changing the cooling temperature in the above conventional system, there is still a time delay, and the cooling temperature cannot be accurately maintained at a predetermined value, or the object to be cooled is thermally damaged. was there. In order to adjust the suction force generated in the ejector by adjusting the fluid temperature in the tank with the heat exchange means in the tank, it takes time until the fluid in the tank reaches the ejector and generates a predetermined suction force. It will cause a delay.
[0004]
Accordingly, an object of the present invention is to obtain an evaporative cooling device that can maintain the cooling temperature at a predetermined value with high accuracy without causing a time delay when the cooling temperature is changed.
[0005]
[Means for Solving the Problems]
Means for solving the above problems includes evaporative cooling by providing a suction means for sucking a fluid, a vaporization cooling chamber communicating with the suction means, and a cooling fluid supply passage for injecting a cooling fluid into the vaporization cooling chamber. in which evaporative cooling of the object to be cooled by evaporation latent heat of the cooling fluid in the chamber, the suction means is formed in the ejector and the tank and the circulation pump, between the circulation pump and the ejector, arranged in-line heater of the ejector type In addition, a heat exchange fluid supply pipe is connected to the inline heater via a control valve and a check valve, and a control valve for controlling the pressure or temperature of the vaporization cooling chamber is disposed between the vaporization cooling chamber and the suction means. Is.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
By arranging a control valve for controlling pressure or temperature between the evaporative cooling chamber and the suction means, the pressure or temperature of the evaporative cooling chamber can be instantaneously controlled without any time delay by operating the control valve. It can be changed and maintained with an accuracy according to the accuracy. Usually, since the relationship between pressure and temperature is uniquely determined for saturated steam, the temperature can be controlled simultaneously by controlling the pressure.
[0007]
The control valve only needs to be able to control the pressure and temperature on the evaporative cooling chamber side by adjusting the valve opening and controlling the flow rate of the fluid. Various automatic control valves, pressure control valves, A temperature control valve or the like can be used.
[0008]
For example, if the control valve is operated to increase the valve opening while maintaining the suction force of the suction means close to the maximum value, the amount of fluid sucked by the suction means increases and the pressure in the vaporization cooling chamber decreases. As a result, the degree of decompression is increased and the cooling temperature can be further lowered. On the other hand, if the control valve is operated to reduce the valve opening, the suction amount of the suction means decreases, the pressure in the vaporization cooling chamber increases, the degree of decompression decreases, and the cooling temperature can be increased.
[0009]
【Example】
The illustrated embodiment will be described in detail.
In the present embodiment, an example in which the jacket portion 2 of the reaction kettle 1 is used as a vaporization cooling chamber is shown. A reactor 1 provided with a jacket portion 2 as a vaporization cooling chamber, a suction means 6, a cooling fluid supply passage 7 for supplying a cooling fluid to the jacket portion 2, and a control disposed between the jacket portion 2 and the suction means 6. The valve 8 constitutes a vaporization cooling device.
[0010]
The reaction kettle 1 is formed with a jacket portion 2 over substantially the entire circumference, and includes a temperature sensor 10 that houses an object to be cooled (not shown) and detects the temperature of the object to be cooled. A pressure sensor 12 that detects the pressure in the jacket portion 2 and a temperature sensor 13 that similarly detects the temperature are attached to the jacket portion 2, and a control valve 8 is attached to the pipe line 11 at the lower portion of the jacket portion 2 to be described later. It connects with the ejector 3 of the suction means 6 to perform.
[0011]
In this embodiment, the control valve 8 is an automatic control valve that is driven by an electric motor and can control the valve opening to be increased or decreased. The automatic adjustment valve 8 is electrically connected to a pressure sensor 12 and a temperature sensor 13 attached to the jacket portion 2 via a controller (not shown). The pressure or temperature in the jacket portion 2 is detected by the pressure sensor 12 or the temperature sensor 13, and the valve opening degree of the control valve 8 is controlled according to the detected value of the pressure or temperature.
[0012]
The suction means 6 is formed by the ejector 3, the tank 4, and the circulation pump 5, the suction side of the circulation pump 5 is connected to the tank 4, the discharge side is connected to the nozzle portion 14 of the ejector 3, and the diffuser 15 of the ejector 3. Is connected to the upper space of the tank 4. A cooling fluid supply pipe 18 and an overflow pipe 19 for supplying cooling fluid are attached to the tank 4.
[0013]
The fluid in the tank 4 is circulated in the suction means 6 by being supplied to the ejector 3 via the circulation pump 5 and returning to the tank 4. A part of the circulating fluid is supplied from the branch pipe 26 to the jacket portion 2 through the control valve 28 and the cooling fluid supply passage 7, thereby cooling the object to be cooled in the reaction vessel 1.
[0014]
An ejector-type inline heater 9 and a temperature sensor 25 are arranged between the circulation pump 5 and the ejector 3 in the suction means 6. A heat exchange fluid supply pipe 20 is connected to the inline heater 9 via a control valve 16 and a check valve 17. When the circulating fluid circulating through the suction means 6 is heated from the heat exchange fluid supply pipe 20, for example, the heating fluid is supplied and the steam and the circulating fluid are mixed by the in-line heater 9, thereby circulating the circulating fluid. The temperature of the circulating fluid can be arbitrarily increased. Conversely, when the temperature of the circulating fluid is decreased, the temperature of the circulating fluid is arbitrarily determined by supplying cooling water, for example, from the heat exchange fluid supply pipe 20 to the in-line heater 9. Can be lowered.
[0015]
An ejector-type in-line heater 21 and a temperature sensor 27 are similarly arranged between the branch pipe 26 of the suction means 6 and the cooling fluid supply passage 7. A heat exchange fluid supply pipe 24 is also connected to the inline heater 21 via a control valve 22 and a check valve 23. The in-line heater 21 supplies the fluid temperature of the cooling fluid supply passage 7 that supplies the cooling fluid to the jacket portion 2, and supplies steam for heating or cooling water for cooling while controlling the valve opening degree of the control valve 22. Thus, the temperature can be controlled arbitrarily.
[0016]
In the present embodiment, not only evaporative cooling by the cooling fluid in the jacket part 2 but also steam for heating can be performed by supplying steam for heating. That is, the heating steam supply pipe 30 is connected to the jacket portion 2 via the pressure reducing valve 31, the control valve 32, the gas-liquid separator 45, and the pressure sensor 33, respectively. A drain discharge pipe 34 is connected to the lower end of the jacket portion 2 for discharging the drain condensed with the heating steam. The drain discharge pipe 34 has an on-off valve 35 and a steam trap 36 arranged in parallel, and is connected to a suction means 37 for heating. The suction means 37 for heating comprises an ejector 38, a tank 39, and a circulation pump 40. Like the separate suction means 6, the drain in the jacket portion 2 and a part of the steam that could not be condensed by the ejector 38 are used. It is to suck.
[0017]
A circulation path of the suction means 37 for heating is branched and connected to the heating steam supply pipe 30 by a pipe 41. A strainer 42 and an opening degree adjusting valve 43 are attached to the pipeline 41. By supplying a part of the circulating fluid circulating through the suction means 37 from the pipe 41 to the heating steam supply pipe 30, the temperature of the steam in the heating steam supply pipe 30 can be appropriately reduced. . In particular, when the heating steam becomes superheated steam, it is suitable for obtaining a saturated temperature steam by supplying a circulating fluid.
[0018]
Although not shown, each sensor, control valve, control valve, other valve, pump, or the like is connected to a controller or control unit so that it can be centrally controlled.
[0019]
When cooling an object to be cooled in the reaction vessel 1 (not shown), a cooling fluid having a predetermined temperature is supplied to the jacket portion 2 from the branch pipe 26 and the cooling fluid supply passage 7 so that the cooling fluid is supplied to the reaction vessel 1 in the reaction vessel 1. By taking the heat of the cooling object and evaporating, the object to be cooled is vaporized and cooled by the latent heat of evaporation.
[0020]
For example, when the actual temperature of the object to be cooled in the reaction kettle 1 is about 61 to 62 ° C., and the temperature of the object to be cooled is cooled to 60 ° C., the valve opening of the control valve 8 is adjusted to adjust the jacket. The temperature in the part 2 is controlled to about 58 to 59 ° C., or the pressure in the jacket part 2 is controlled to about 140 to 150 Torr to prevent temperature variation and overshoot of the object to be cooled. The predetermined value can be maintained with high accuracy. In this case, the suction force of the suction means 6 is set to a value of 140 to 150 Torr or less.
[0021]
The vaporized vapor obtained by removing the heat of the object to be cooled in the jacket portion 2 and the cooling fluid remaining without being vaporized are sucked into the ejector 3 through the pipe line 11 and the control valve 8 below the jacket portion 2, and are stored in the tank. To 4.
[0022]
The temperature of the cooling fluid supplied to the jacket portion 2 can be appropriately controlled by arbitrarily adjusting with the in-line heater 9 or 21. Further, the suction force of the ejector 3 can be increased by lowering the temperature of the fluid passing therethrough, and the suction force can be lowered by increasing the temperature of the fluid.
[0023]
【The invention's effect】
By arranging a control valve between the evaporative cooling chamber and the suction means, a evaporative cooling device capable of accurately maintaining the cooling temperature at a predetermined value without causing a time delay when changing the cooling temperature is obtained. be able to.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a vaporization cooling apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reaction kettle 2 Jacket part 3 Ejector 4 Tank 5 Circulating pump 6 Suction means 7 Cooling fluid supply passage 8 Control valve 9 Inline heater 12 Pressure sensor 13 Temperature sensor 21 Inline heater 26 Branch pipe 30 Heating steam supply pipe 37 Heating suction means

Claims (1)

A suction means for sucking a fluid, a vaporization cooling chamber communicating with the suction means, and a cooling fluid supply passage for injecting a cooling fluid into the vaporization cooling chamber are provided, and an object to be cooled is caused by latent heat of vaporization of the cooling fluid in the vaporization cooling chamber. in which evaporative cooling, and the suction means is formed in the ejector and the tank and the circulation pump, between the circulation pump and the ejector, by placing the line heater of the ejector type, the control valve and the check on the line heater A vaporization cooling apparatus, wherein a heat exchange fluid supply pipe is connected via a valve, and a control valve for controlling the pressure or temperature of the vaporization cooling chamber is disposed between the vaporization cooling chamber and the suction means.

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