JP3203404B2 - Decompression evaporative cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for evaporating and cooling an object to be cooled by evaporating latent heat of cooling water in a cooling chamber under reduced pressure. Specific examples of the reduced-pressure evaporative cooling device include cooling devices for various reactors, and cooling devices for foods, medical products, paper, pulp, and various fibers. In many cases, thermal damage is caused by a slight rise in temperature. Therefore, it is important in terms of quality to prevent a part where cooling is partially insufficient, that is, to prevent uneven cooling.

[0002]

2. Description of the Related Art As a conventional reduced-pressure evaporative cooling apparatus, there is, for example, one disclosed in Japanese Patent Application Laid-Open No. Hei 5-26552. This is a cooling water injection nozzle for supplying cooling water to the vaporizing cooling chamber, in which the nozzle hole is formed substantially above the nozzle and in a fan shape so that the cooling water is injected into the object to be cooled. Cooling water can be made to adhere to a wide surface of an object, and cooling unevenness can be prevented and the cooling effect can be enhanced.

[0003]

In the above-described conventional vacuum evaporative cooling apparatus, there is a problem that a larger number of cooling water injection nozzles must be installed as the surface area of the object to be cooled increases. This is because, regardless of the shape of the nozzle hole, the area for injecting cooling water through one nozzle hole is limited, and therefore, the surface area of the object to be cooled increases with the increase in the surface area of the object to be cooled. Therefore, many cooling water injection nozzles must be installed.

Accordingly, a technical problem of the present invention is to increase the injection area of one cooling water injection nozzle so that the cooling water can be uniformly injected into the object to be cooled having a large surface area with a small number of injection nozzles. Is to be able to do it.

[0005]

The structure of the reduced pressure evaporative cooling device of the present invention is as follows. A vaporization cooling chamber is formed in contact with the object to be cooled, and cooling water is allowed to flow into the vaporization cooling chamber and the pressure of the vaporization cooling chamber is reduced by a vacuum pump. A substantially cylindrical cooling water injection nozzle for injecting into the chamber is arranged, a tip of the cooling water injection nozzle is inclined at a desired angle, and a substantially cylindrical cooling water injection nozzle is rotatably mounted.

[0006]

The tip of the substantially cylindrical cooling water injection nozzle is tilted at a desired angle and rotatably mounted, so that the tip of the nozzle rotates on a conical surface corresponding to the inclination angle of the tip. Therefore, the cooling water can be injected at a wide angle obtained by adding the inclination angle of the tip to the water injection angle only by the nozzle hole,
With a small number of injection nozzles, cooling water can be attached to a wide range of objects to be cooled.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In this embodiment, an example is shown in which a vacuum pump 22 combined with an ejector is used as a vacuum pump, which can adjust the degree of pressure reduction by adjusting the temperature of circulating water. In FIG. 1, a reaction vessel 11 as an object to be cooled and a vacuum pump 22
, A jacket section 15 as a vaporizing cooling chamber, and cooling water injection nozzle sections 16 and 17 constitute a reduced-pressure vaporizing cooling apparatus.

The reactor 11 has a raw material inlet 1 as an object to be cooled.
2. It has a product outlet 13 and a stirrer 14, and a jacket 15 is provided on the outer periphery thereof. A plurality of cooling water injection nozzles 16 and 17 are attached to an upper portion of the jacket 15, and a cooling water supply pipe 40 is connected to the injection nozzles 16 and 17. The cooling water supply pipe 40 is provided with valve devices 6, 26, 28 for opening and closing the pipe line and adjusting the flow rate.

The cooling water supply nozzles 16 and 17 are provided with a cooling water supply pipe 4 at the center as shown in a partially enlarged sectional view of FIG.
The cooling water injection nozzle 2 is connected to the cooling water injection nozzle 2 and has a motor 36 for rotating the cooling water injection nozzle 2. The left end portion 27 of the cooling water supply nozzle 2 is formed to be inclined at a predetermined angle. In this embodiment, they are arranged at an angle of about 45 degrees. The cooling water injection nozzle 2 integrally forms a rotating flange 23 at the right end and is attached to the jacket 15 via a gasket 29. A rotating gear 25 is mounted on the right side of the flange 23 to reduce the speed of the motor 36.
Connect with 4. The cooling water supply pipe 40 is slidably mounted in the cooling water supply nozzle 2 via the seal ring 20 and connected to the nozzle tip 27 via the passage 7. Motor 36
The rotation of the cooling water injection nozzle 2 rotates about its cylindrical axis via the gears 24 and 25, and the tip end portion 27 rotates on a conical surface corresponding to the inclination angle.
Does not rotate.

The vacuum pump 22 includes a circulation pump 30 having a suction side connected to a tank 31, a discharge side connected to a nozzle 33 of an ejector 32, and a diffuser 34 of the ejector 32.
Are connected to the upper space of the tank 31. Nozzle 33 and fluid outlet 18 of jacket 15
Are connected via a communication path 21. The vacuum pump 22 supplies the water in the tank 31 to the ejector 32 by the operation of the circulation pump 30 to cause the ejector 32 to perform a suction operation, and returns the water to the tank 31. A part of the fluid circulating through the vacuum pump 22 can also reach the cooling water injection nozzles 16 and 17 through the valve 72 and the supply pipe 19 and the valve devices 26 and 28.

The cooling water supply pipe 40 communicates with the tank 31 via a valve 70. By supplying cooling water into the tank 31, the temperature of the circulating water of the vacuum pump 22 is controlled. The valve 70 opens and closes according to a signal from a temperature sensor 41 that detects the temperature of water in the tank 31.

A valve 71 is attached to a part of the circulation path of the vacuum pump 22 so that the water level in the tank 31 is kept within a predetermined range by signals from water level sensors 42 and 43 in the tank 31.

When the reactor 11 to be cooled is cooled, the valves 6, 26 and 28 are opened to supply cooling water from the injection nozzles 16 and 17 into the jacket 15. Since the cooling water injection nozzle 2 is rotated by the motor 36, the water injection angle is determined by the injection angle of only the nozzle indicated by the broken line in FIG. 2 and the water injection angle by the rotation of the nozzle tip 27 also indicated by the dashed line in FIG. , And the cooling water can be injected into a wider area.

The cooling water and the vaporized vapor that have cooled the reactor 11 are discharged from the fluid discharge port 18 through an ejector 32 of a vacuum pump 22.
Is sucked to reach the tank 31.

The cooling fluid in the jacket portion 15 is sucked from the fluid discharge port 18 by the ejector 32 and reaches the tank 31.
When the water level in the tank 31 rises, the upper limit water level sensor 42
Is detected, the valve 71 is opened to discharge surplus water, and the water level is kept within a predetermined range. The degree of decompression of the jacket 15 is
It can be adjusted by controlling the water temperature of the tank 31.

Further, in the present embodiment, a part of the circulating fluid of the vacuum pump 22 is supplied to the jacket portion 15 via the valve 72, so that the reactor 11 can be cooled with the circulating fluid. Can also.

[0017]

According to the present invention, the tip of the substantially cylindrical cooling water injection nozzle is tilted at a desired angle and rotatably mounted, so that the cooling water can be provided at a wide injection angle by adding the water injection angle only by the nozzle hole and the inclination angle of this tip. Therefore, the cooling water can be injected into the object to be cooled having a larger area with a small number of nozzles.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of an embodiment of a reduced-pressure evaporative cooling device of the present invention.

FIG. 2 is a partially enlarged sectional view of a cooling water injection nozzle in FIG.

[Explanation of symbols]

 2 Cooling water injection nozzle 11 Reaction vessel 15 Jacket section 16, 17 Cooling water injection nozzle section 22 Vacuum pump 23 Rotating flange section 27 Nozzle tip section 31 Tank 32 Ejector 33 Nozzle 36 Motor 40 Cooling water supply pipe

Claims (1)

(57) [Claims] An evaporative cooling chamber is formed in contact with an object to be cooled,
The cooling water is introduced into the evaporative cooling chamber and the evaporative cooling chamber is depressurized by a vacuum pump to evaporate and cool the object to be cooled. A decompression evaporative cooling device, wherein a cooling water injection nozzle is disposed, a tip of the cooling water injection nozzle is inclined at a desired angle, and a substantially cylindrical cooling water injection nozzle is rotatably mounted.