JP3593406B2 - Decompression heating and cooling equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reduced-pressure heating / cooling apparatus that heats or cools an object to be heat-treated in a vacuum state at or below atmospheric pressure or a pressure state slightly higher than atmospheric pressure. Specifically, the present invention relates to a heating and cooling apparatus for heating and cooling a reaction vessel for performing various polymerization reactions and condensation reactions, or a heating and cooling apparatus for foods, fibers, films, medical products, and the like. These may be deteriorated by a slight temperature change or cause an abnormal reaction, and the improvement of the temperature accuracy at the time of heating / cooling has a great influence on the product quality and productivity.
[0002]
[Prior art]
An example of a conventional reduced pressure heating / cooling apparatus is disclosed in, for example, JP-A-5-1871. In this method, a vacuum pump for drainage is connected below the jacket of the reactor, and a vacuum pump for exhaustion is connected above, so that the liquid and gas generated during the heat treatment can be reliably discharged by the respective vacuum pumps. By suction, it is possible to prevent temperature unevenness and maintain the product quality of the heat-treated object at a constant level.
[0003]
[Problems to be solved by the invention]
In the above-described conventional apparatus, when an ejector-type vacuum pump is used as an exhaust vacuum pump, and condensed water stays in the ejector when the steam at a pressure higher than the atmospheric pressure is sucked, the function as a vacuum pump is performed. There was a problem that could not be achieved.
[0004]
When the steam pressure is higher than the atmospheric pressure, the steam is supplied into the ejector regardless of the suction capacity of the ejector type vacuum pump, so the supplied steam condenses into condensed water and stays there. is there.
[0005]
Therefore, a technical problem of the present invention is to provide a reduced pressure heating / cooling apparatus in which condensed water does not stay in an ejector even when an ejector-type vacuum pump is used as an exhaust suction means.
[0006]
[Means for Solving the Problems]
The technical means of the present invention used to solve the above technical problem is to connect a suction means for exhaust and a suction means for drain to a heat exchange chamber and supply a heating / cooling fluid to the heat exchange chamber. In which the fluid supply passages are communicated with each other, wherein the exhaust suction means is formed by an ejector type vacuum pump, and a communication pipe is provided for communicating the ejector peripheral portion of the ejector type vacuum pump with the drainage suction means. It is.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
By communicating the peripheral part of the ejector with the suction means for drainage by the communication pipe, steam above the atmospheric pressure is supplied to the ejector vacuum pump, and when condensed water stays in the ejector, the condensed water stays from the communication pipe. The suction of the condensed water by the drainage suction means can prevent stagnation.
[0008]
【Example】
The illustrated embodiment will be described in detail.
In this embodiment, an example in which a reaction vessel 1 is used as a heating and cooling device will be described.
The reactor 1, the fluid supply passage 2, the exhaust ejector-type vacuum pump 3, and the drainage ejector-type vacuum pump 4 as a drainage suction unit constitute a reduced-pressure heating / cooling device. The reactor 1 has a jacket portion 5 as a heat exchange chamber, and the jacket portion 5 is provided with a fluid supply port 6 and fluid discharge ports 7 and 8.
[0009]
The exhaust ejector-type vacuum pump 3 connects an exhaust ejector 11, a tank 12, and a circulation pump 13 through a circulation path 14. One end of the circulation path 14 is connected to the nozzle 9, and the suction chamber 10 is connected to a pipe. It is connected to the fluid discharge port 8 of the jacket section 5 through a passage 15. The fluid in the tank 12 is supplied to the nozzle 9 by the circulation pump 13, a suction force is generated in the suction chamber 10, the gas in the jacket portion 5 is sucked, and the gas flows down into the tank 12 again. By branching a part of the circulation path 14 and connecting it to the jacket part 5 by a pipe line 22, a part of the circulating fluid can be supplied to the jacket part 5 to cool the reaction vessel 1 by the circulating fluid. It is. Further, a cooling fluid supply pipe 23 for supplying a cooling fluid into the tank 12 is connected to an upper portion of the tank 12.
[0010]
Condensed water outlets 16, 17, and 18 are attached to the periphery of the exhaust ejector 11, and are connected to the drainage vacuum pump 4 through a pipe 19. A check valve 20 and an on-off valve 21 are attached to the pipeline 1.
[0011]
The ejector-type vacuum pump 4 for drainage is composed of an ejector 25 having a nozzle 24, a tank 26, and a circulation pump 27, similarly to the exhaust pump. The suction side of the circulation pump 27 is connected to the tank 26, and the discharge side is connected to the nozzle 24. The ejector 25 and the fluid outlet 7 of the reaction vessel 1 are connected via a steam trap 50 and an on-off valve 51. The ejector-type vacuum pump 4 for drainage also supplies water in the tank 26 to the ejector 25 by the operation of the circulating pump 27 so that the water is sucked and returned to the tank 26. The fluid discharge passage 54 is connected to the circulation path 52 via an on-off valve 53, and the circulating water supply passage 56 is connected to the fluid supply port 6 of the jacket 5 via the on-off valve 55 and the fluid supply path 2. Further, a cooling water supply pipe 28 is connected to the tank 26.
[0012]
The fluid supply passage 2 is connected to the heating steam supply pipe 29 via a valve 30 and to the fluid supply port 6 of the jacket portion 5. A separate cooling fluid supply pipe 31 is connected to the upper part of the fluid supply port 6.
[0013]
When heating the heat treatment target (not shown) in the reaction vessel 1, first, the valve 30 is opened, steam is supplied from the heated steam supply pipe 29 to the jacket portion 5, and the circulation pump 27 is driven to the ejector 25. The water in the tank 26 is circulated. The inside of the jacket portion 5 is depressurized by the drainage ejector type vacuum pump 4, and the reactor 1 is heated by the low pressure steam supplied from the valve 30. The condensed water that has been condensed by heating the reaction vessel 1 is sucked from the fluid discharge port 7 through the steam trap 50 or the on-off valve 51 to the ejector 25 and reaches the tank 26.
[0014]
When cooling the reactor 1, the valve 30 is closed to stop the supply of steam, the cooling water is supplied from the cooling fluid supply pipe 31 into the jacket portion 5, and the exhaust ejector type vacuum pump 3 is turned on. When driven, the gas in the jacket portion 5 is sucked by the ejector 11 to reduce the pressure in the jacket portion 5. The supplied cooling water is immediately vaporized due to the heat of the reactor 1 and the reduced pressure state, thereby vaporizing and cooling the reactor 1. The vaporized vapor is sucked into the ejector 11, and the cooling water that has not been completely vaporized is sucked into the ejector 25 of the drainage-type vacuum pump 4.
[0015]
In the case where the reactor 1 is cooled, if it is necessary to gradually cool the reactor 1 from a relatively high temperature of about 100 ° C. to a low temperature of 100 ° C. or less depending on the type of the heat treatment target, the evacuation ejector vacuum pump 3 Is supplied from the steam supply pipe 29 to the jacket section 5 at a pressure higher than the atmospheric pressure. In this case, the supplied steam reaches the ejector 11 regardless of the suction capacity of the ejector 11 and finally stays in the ejector 11 as condensed water. The water is sucked into the ejector-type vacuum pump 4 via the pipe 19 and the check valve 20 by the ejector 25 to prevent stagnation. Accordingly, it is possible to prevent the inside of the ejector 11 from being sealed with the condensed water and not functioning as a vacuum pump.
[0016]
【The invention's effect】
The condensed water staying in the ejector is sucked out by the drainage suction means through the communication pipe and eliminated, thereby preventing the condensed water from staying in the ejector, thereby improving the function of the ejector-type vacuum pump. A reduced-pressure heating / cooling device that can be reliably performed can be obtained.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of a reduced pressure heating / cooling apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reactor 2 Fluid supply passage 3 Ejector-type vacuum pump for exhaust 4 Ejector-type vacuum pump for drainage 5 Jacket section 11 Ejector for exhaust
12 Tank 13 Circulation pump 19 Pipe line 20 Check valve 25 Drainage ejector
29 Steam supply pipe 50 Steam trap

Claims (1)

An exhaust suction unit and an exhaust suction unit are connected to the heat exchange chamber, and an exhaust suction unit is connected to a fluid supply passage capable of supplying a heating / cooling fluid to the heat exchange chamber. And a communication pipe for communicating a peripheral portion of the ejector of the ejector-type vacuum pump with a suction means for drainage is provided.

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