JPH09166375A - Equipment for heating and cooling under reduced pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent stagnation of condensate in an ejector for exhaust. SOLUTION: A fluid supply passage 2, an ejector type vacuum pump 3 for exhaust and an ejector type vacuum pump 4 for liquid discharge are connected to a jacket part 5 of a reaction pot 1. An ejector 11 of the ejector type vacuum pump 3 for exhaust is connected with the ejector type vacuum pump 4 for liquid discharge by a passage 19. Condensate stagnating in the ejector 11 is sucked by the ejector type vacuum pump 4 for liquid discharge through the passage 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decompression heating / cooling apparatus for heating or cooling an object to be heat-treated in a vacuum state below atmospheric pressure or in 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 things may be deteriorated by a slight temperature change or cause an abnormal reaction, which improves the temperature accuracy during heating and cooling.
This will have a great impact on product quality and productivity.

[0002]

2. Description of the Related Art As an example of a conventional reduced pressure heating and cooling device,
For example, there is one disclosed in Japanese Patent Laid-Open No. 5-1871. This is one in which a vacuum pump for drainage is connected to the bottom of the jacket of the reaction vessel, and a vacuum pump for exhaust is connected to the top, so that the liquid and gas generated during heat treatment can be reliably held by the respective vacuum pumps. By sucking, temperature unevenness can be prevented and the product quality of the heat-treated object can be maintained constant.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
Using an ejector-type vacuum pump as the exhaust vacuum pump,
There is a problem that when sucking vapor under a pressure higher than the atmospheric pressure, condensed water stays in the ejector and fails to function as a vacuum pump.

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 that the supplied steam is condensed into condensed water and stays there. It will end up.

Therefore, a technical problem of the present invention is to obtain a decompression heating / cooling device in which condensed water does not stay in the ejector even when an ejector type vacuum pump is used as the exhaust suction means. Is.

[0006]

The technical means of the present invention used to solve the above technical problems is a heat exchange chamber in which exhaust suction means and drain suction means are connected to form a heat exchange chamber. In the fluid supply passage capable of supplying the heating and cooling fluid to the device, the exhaust suction means is formed by an ejector vacuum pump, and the ejector peripheral part of the ejector vacuum pump and the drain suction means It is provided with a communication pipe for communicating with each other.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION By connecting a peripheral portion of an ejector to a suction means for draining liquid by a communication pipe, vapor above atmospheric pressure is supplied to an ejector type vacuum pump, and the ejector
When the condensed water stays inside, the staying can be prevented by sucking the condensed water staying from the communication pipe by the drainage suction means.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In this embodiment, an example in which the reaction kettle 1 is used as the heating / cooling device is shown. Reaction kettle 1, fluid supply passage 2, exhaust ejector
The vacuum vacuum pump 3 and the drainage ejector vacuum pump 4 as the drainage suction means constitute a reduced pressure heating and cooling device.
The reaction kettle 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.

The exhaust ejector-type vacuum pump 3 comprises an exhaust ejector 11, a tank 12 and a circulation pump 13 connected by a circulation passage 14. One end of the circulation passage 14 is connected to the nozzle 9
And the suction chamber 10 is connected to the fluid discharge port 8 of the jacket portion 5 via the pipe line 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 to suck the gas in the jacket 5, and the gas is again flown into the tank 12. It is also possible to supply a part of the circulating fluid to the jacket portion 5 and cool the reaction vessel 1 by this circulating fluid by branching a part of the circulating passage 14 and connecting it to the jacket portion 5 by the pipe line 22. Is. Further, a cooling fluid supply pipe 2 for supplying a cooling fluid into the tank 12 is provided above the tank 12.
3 is connected.

Condensed water outlets 16, 17, and 18 are attached to the peripheral portion of the exhaust ejector 11, and are connected to the drainage ejector-type vacuum pump 4 through a conduit 19. A check valve 20 and an on-off valve 21 are attached to the pipeline 1.

The ejector-type vacuum pump 4 for draining liquid is composed of an ejector 25 having a nozzle 24, a tank 26, and a circulation pump 27 as in the case of exhausting. 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 discharge port 7 of the reaction kettle 1 are connected via a steam trap 50 and an opening / closing valve 51. The drainage ejector-type vacuum pump 4 is also configured to supply the water in the tank 26 to the ejector 25 by the operation of the circulation pump 27 so as to suck the water and return it to the tank 26.
A fluid discharge passage 54 is connected to the circulation passage 52 via an opening / closing valve 53, and a circulating water supply passage 56 is connected to the fluid supply port 6 of the jacket portion 5 via the opening / closing valve 55 and the fluid supply passage 2. A cooling water supply pipe 28 is connected to the tank 26.

The fluid supply passage 2 is connected to the heating steam supply pipe 29 via a valve 30 and is also connected to the fluid supply port 6 of the jacket portion 5. A separate cooling fluid supply pipe 31 is connected to the upper portion of the fluid supply port 6.

When heating an object to be heat-treated (not shown) in the reaction kettle 1, first, the valve 30 is opened to supply steam to the jacket 5 from the heating steam supply pipe 29, and the circulation pump 27 is driven to eject the ejector. The water in the tank 26 is circulated in the -25. The inside of the jacket portion 5 is decompressed by the drainage ejector-type vacuum pump 4, and the low-pressure steam supplied from the valve 30 heats the reaction kettle 1. Condensed water obtained by heating the reaction kettle 1 to be condensed is sucked by the ejector 25 from the fluid discharge port 7 through the steam trap 50 or the opening / closing valve 51 and reaches the tank 26.

When the reaction kettle 1 is cooled, 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 is used. Drive the pump 3 and ejector 11
Then, the gas in the jacket portion 5 is sucked to reduce the pressure in the jacket portion 5. The supplied cooling water immediately evaporates due to the heat and reduced pressure of the reaction kettle 1 to evaporatively cool the reaction kettle 1.
The vaporized vapor is sucked into the ejector 11, and the cooling water that has not been vaporized is sucked into the ejector 25 of the drainage ejector-type vacuum pump 4.

When the reaction kettle 1 is cooled, depending on the kind of the heat-treated object, when it is necessary to gradually cool from a relatively high temperature of about 100 ° C. to a low temperature of 100 ° C. or less, an exhaust ejector type While driving the vacuum pump 3, steam having a pressure equal to or higher than atmospheric pressure is supplied to the jacket portion 5 from the steam supply pipe 29. In this case, the supplied steam is ejected regardless of the suction capacity of the ejector 11.
Although it reaches the 11th part, it finally stays in the ejector 11 as condensed water, but by opening the on-off valve 21, this condensed water passes through the conduit 19 and the check valve 20 and the ejector vacuum for drainage. It can be sucked by the ejector 25 of the pump 4 to prevent the retention. Therefore, it is possible to prevent the inside of the ejector 11 from being water-sealed with condensed water and failing to function as a vacuum pump.

[0016]

The condensed water staying in the ejector is sucked and removed by the drainage suction means through the communication pipe to prevent the condensed water from staying in the ejector and to be ejector-type. It is possible to obtain a reduced pressure heating / cooling device that can surely fulfill the function of a vacuum pump.

[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]

 1 Reactor 2 Fluid supply passage 3 Exhaust ejector-type vacuum pump 4 Ejector ejector-type vacuum pump 5 Jacket part 11 Exhaust ejector 12 Tank 13 Circulation pump 19 Pipe line 20 Check valve 25 Ejector ejector 29 Steam supply pipe 50 Steam trap

Claims (1)

[Claims] 1. An exhaust suction means in which a heat exchange chamber is connected to an exhaust suction means and a drainage suction means, and a fluid supply passage capable of supplying a heating / cooling fluid is connected to the heat exchange chamber. A reduced pressure heating / cooling device, which is formed by an ejector-type vacuum pump and is provided with a communication pipe that connects a peripheral portion of the ejector-type vacuum pump ejector and a drainage suction means.