JPH07108167A - Heating and cooling device - Google Patents

Abstract

PURPOSE:To provide the device suitable to relatively low temp. heating, without causing thermal damage, capable of maintaining temp. precision over a long period and by which. cooling is rapidly switched to heating. CONSTITUTION:A jacket 2 is formed on almost true whole periphery of a reaction kettle 1, and a cooling chamber 3 is provided between the kettle 1 and the jacket 2. A steam pipe 5 is connected to the jacket 2 through a valve 4. A liq. coolant feed pipe 11 is connected to the upper part of the chamber 3, and a hot water feed pipe 40 is connected through a valve 39. An ejector vacuum pump 22 is connected to the lower parts of the chamber 3 and jacket 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for heating or cooling an object to be heated in a heat exchanger, and particularly, the temperature is 3
The present invention relates to a heating / cooling device suitable for a relatively low temperature of 0 ° C to 100 ° C. Specifically, it is used for heating and cooling various reaction kettles used for the polymerization reaction, a distilling device for food, a concentrating device, a sterilizing device, and the like. In these cases, the object to be heat-treated often suffers thermal damage due to a slight temperature rise, and it was necessary to maintain the heating / cooling temperature accurately.

[0002]

2. Description of the Related Art As a conventional heating / cooling device for preventing heat damage, for example, an example of a reaction vessel disclosed in Japanese Patent Laid-Open No. 3-127625 has been used. This is because by providing a porous member on the outer wall of the reaction vessel with a minute gap, excessive supply of heating steam is prevented by the porous member and heating is performed while preventing thermal damage to the object to be heated. In addition to being able to be performed, the cooling water can be uniformly supplied to the entire outer wall of the reaction vessel even during cooling, and the entire reaction vessel can be uniformly cooled.

[0003]

The conventional heating / cooling device described above can maintain the heating / cooling temperature with high accuracy at the initial stage of use, but the temperature can be maintained accurately with long-term use. There was a problem that it became difficult to maintain. This is because heating steam or cooling water is supplied through the porous member, so the porous member becomes clogged during long-term use, and the temperature cannot be maintained accurately. This is because it will end up. In general heating steam and cooling water, foreign matters such as scales are mixed, and oxides generated in pipes and devices are mixed, which causes clogging.

Further, in the above-mentioned conventional heating / cooling device, it takes a relatively long time to switch from heating to cooling or from cooling to heating, and there is a problem that switching cannot be performed promptly. This is because the steam and the cooling water are alternately supplied to the fluid chamber, which requires time for replacement.

Therefore, a technical problem of the present invention is to provide a heating / cooling device which can maintain the heating / cooling temperature with high accuracy even during long-term use and can quickly switch between heating and cooling. Is.

[0006]

The structure of the steam heating apparatus of the present invention is as follows. A heat exchanger, a steam chamber that covers substantially the entire circumference of the heat exchanger, and a steam pipe that supplies heating steam to the steam chamber via a valve, between the heat exchanger and the steam chamber. A cooling chamber is formed, a cooling liquid supply pipe and a hot water supply pipe are connected to the cooling chamber via a valve, and a suction means for maintaining the cooling chamber in a depressurized state is connected.

[0007]

Since the cooling chamber is formed between the heat exchanger and the steam chamber, the heat exchanger is heated by the steam in the steam chamber through the cooling chamber. When only the air remains without supplying the cooling liquid to the cooling chamber, the heat of the steam in the steam chamber is transferred through this air layer. Therefore, even if steam having a temperature of 100 degrees C or higher, that is, steam having a pressure higher than atmospheric pressure is supplied,
It can be heated at a low temperature of 100 ° C. or lower. Further, by reducing the pressure in the cooling chamber by the suction means, the amount of heat transfer is further reduced, and it is possible to heat at a low temperature.

When switching from heating to cooling, the supply of steam to the steam chamber is stopped and the cooling liquid is supplied from the cooling liquid supply pipe to the cooling chamber. Also,
By reducing the pressure of the cooling chamber with the suction means, the evaporation of the cooling liquid can be promoted and the heat exchanger can be vaporized and cooled by the latent heat of vaporization.

When switching from cooling to heating again, the supply of the cooling liquid to the cooling chamber is stopped, hot water is supplied to the cooling chamber from the hot water supply pipe, and then the heating steam is supplied to the steam chamber, thereby promptly You can switch to heating.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment will be described in detail. In this embodiment, an example in which the reaction kettle 1 is used as the heat exchanger is shown.
A heating / cooling device is constituted by the reaction kettle 1 and the jacket 2 as a steam chamber, and the cooling chamber 3 formed between the jacket 2 and the reaction kettle 1. A steam pipe 5 is connected to the jacket 2 via a valve 4.

The reaction kettle 1 as a heat exchanger has a heat treatment object inlet 6, a heat treatment object outlet 7 and a stirrer 8 as in the conventional case. A condensate outlet 9 is provided at the bottom of the jacket portion 2 to condense the heated steam to form condensate and discharge it.

A jacket portion 2 covering almost the entire circumference of the reaction kettle 1.
The cooling chamber 3 formed inside is connected to the cooling liquid supply pipe 11 via the valve 10 at the upper part, and is also connected to the hot water supply pipe 40 via the valve 39. A water outlet 12 is provided in the lower part of the cooling chamber 3 and is connected to an ejector-type vacuum pump 22 via a pipe 21. The condensate discharge port 9 at the bottom of the jacket 2 is also connected to the ejector type vacuum pump 22 via the steam trap 13.

The ejector-vacuum pump 22 has a nozzle portion 2
3, an ejector 25 including a diffuser 24, a tank 26, and a centrifugal pump 27. Tank 26
Is connected to the suction port of the centrifugal pump 27, and the discharge port is connected to the nozzle portion 23 of the ejector 25. Ejector
The vacuum pump 22 circulates the fluid in the tank 26 with the vortex pump 27 and passes it to the nozzle section 23.
A suction force is generated at the nozzle portion 23. An excess liquid discharge passage 29 is connected via a valve 28 to a circulation passage that is connected to the discharge port of the spiral pump 27. In addition, in this embodiment,
A passage 36 is connected to the upper portion of the cooling chamber 3 via a valve 35 in the circulation passage. The tank 26 is provided with liquid level sensors 30 and 31 for detecting the internal liquid level and a temperature sensor 32 for detecting the liquid temperature, and the cooling liquid supply pipe 11 is provided on the upper portion.
The supply pipe 33 branched from is connected.

Next, the operation will be described. When heating the object to be heated in the reaction kettle 1 at a temperature of about 30 ° C., for example, the valve 1
The ejector-type vacuum pump 22 is driven while the valve 0 is opened to supply the cooling liquid to the cooling chamber 3, the pressure inside the cooling chamber 3 is reduced, and heating steam of 100 ° C. or higher is supplied to the jacket 2. It can be done by The heating temperature can be adjusted by controlling the suction force by adjusting the temperature of the fluid passing through the nozzle portion 23 of the ejector-type vacuum pump 22 into the tank 26 and controlling the suction force. The temperature of the supply steam can be adjusted by adjusting the opening of the valve 4.

The cooling liquid supplied into the cooling chamber 3 and the condensate as condensed water generated by heating in the jacket portion 2 are sucked into the ejector 25 through the pipe 21 and the steam trap 13 and reach the tank 26. .

When cooling the reaction vessel 1, the valve 4 is closed to stop the supply of steam, and the valve 10 is opened while driving the ejector vacuum pump 22 to supply the cooling liquid into the cooling chamber 3. By doing so, the inside of the cooling chamber 3 is depressurized, and the reaction vessel 1 can be cooled by the latent heat of vaporization caused by the heat of the reaction vessel 1 being taken and the cooling liquid being vaporized. In this case, the vaporized vapor by cooling and the rest of the cooling liquid are sucked into the ejector 25 through the pipe 21.

When switching from cooling to heating, the valve 10
Is closed to stop the supply of the cooling liquid, the valve 39 is opened to supply the hot water to the cooling chamber 3, and the valve 4 is opened to supply the heated steam to the jacket portion 2, thereby The heat of the part and the heat of the steam immediately heat the reaction kettle 1, so that it is possible to quickly switch to heating without requiring time.

In the present embodiment, a part of the fluid circulating in the ejector-type vacuum pump 22 can be supplied to the cooling chamber 3 through the passage 36.
The circulating fluid warmed by steam at the time of heating can be changed to warm water from the warm water supply pipe 40 and supplied to the cooling chamber 3.

[0019]

According to the present invention, since the cooling chamber is formed between the heat exchanger and the steam chamber, the object to be heated is heated through this cooling chamber and is excessively heated. It can be heated at a low temperature while being free from heat damage. Also, unlike the prior art, there is no clogging because there is no porous member,
Therefore, the heating temperature can be accurately maintained over a long period of time.

According to the present invention, when switching from cooling to heating by connecting a hot water supply pipe to the cooling chamber,
It is possible to supply hot water to the cooling chamber in advance, and it is possible to quickly switch to heating without taking time.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a heating / cooling device of the present invention.

[Explanation of symbols]

 1 Reactor 2 Jacket 3 Cooling Chamber 5 Steam Pipe 11 Coolant Supply Pipe 13 Steam Trap 22 Ejector Vacuum Pump 23 Nozzle 25 Ejector 26 Tank 27 Whirlpool Pump 40 Hot Water Supply Pipe

Claims (1)

[Claims] 1. A heat exchanger, comprising a heat exchanger, a steam chamber covering substantially the entire circumference of the heat exchanger, and a steam pipe for supplying heating steam to the steam chamber via a valve. A cooling chamber is formed between the cooling chamber and the chamber, the cooling liquid supply pipe and the hot water supply pipe are connected to the cooling chamber through a valve, and suction means for maintaining the cooling chamber in a depressurized state is connected. Heating and cooling device.