JP3013070B2 - Heating and cooling device - Google Patents

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 and cooling a material to be heated in a heat exchanger, and more particularly to a device for heating and cooling a material to be cooled.
The present invention relates to a heating and cooling device suitable for a relatively low temperature of about 0 ° C. to 100 ° C. More specifically, it is used for heating and cooling various kinds of reaction pots used for the polymerization reaction, a distilling device for food, a concentrating device, a sterilizing device, and the like. In these cases, the heat-treated material often causes thermal damage due to a slight rise in temperature, and it is necessary to accurately maintain the heating and cooling temperatures.

[0002]

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

[0003]

The above-mentioned conventional heating and cooling apparatus can maintain the heating and cooling temperature with high accuracy in the initial stage of the start of use, but can accurately maintain the temperature after long-term use. There was a problem that it was difficult to maintain. This is because heating steam or cooling water is supplied through the porous member, so that the porous member is clogged during long-term use, and the temperature cannot be maintained accurately. This is because In general, steam and cooling water contain foreign substances such as scales, and oxides generated in pipes and devices, and the like, resulting in clogging.

In addition, the conventional heating / cooling apparatus has a problem in that switching from heating to cooling or from cooling to heating requires a relatively long time and cannot be performed quickly. This is because it takes time to exchange the steam and the cooling water to the fluid chamber alternately.

Accordingly, it is an object of the present invention to provide a heating / cooling apparatus which can maintain a heating / cooling temperature with high accuracy even during long-term use and can quickly switch between heating and cooling. It is.

[0006]

The structure of the steam heating apparatus according to the present invention is as follows. A heat exchanger, a steam chamber covering almost the entire circumference of the heat exchanger, and a steam pipe for supplying heating steam to the steam chamber via a valve, wherein a heat pipe is provided 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 suction means for maintaining the cooling chamber in a reduced pressure state is connected.

[0007]

With the cooling chamber formed between the heat exchanger and the steam chamber, the heat exchanger is heated by the steam in the steam chamber via the cooling chamber. If only the air stays without supplying the cooling liquid to the cooling chamber, the heat of the steam in the steam chamber is transmitted through the air layer. Therefore, even if steam at a temperature of 100 ° C. or higher, that is, steam at a pressure higher than the atmospheric pressure is supplied,
It can be heated at a low temperature of 100 ° C. or less. Further, by reducing the pressure in the cooling chamber by the suction means, the heat transfer amount is further reduced, and the cooling chamber can be heated 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 to the cooling chamber from a cooling liquid supply pipe. Also,
By setting the cooling chamber in a reduced pressure state by the suction means, the evaporation of the cooling liquid is promoted, and the heat exchanger can be vaporized and cooled by the latent heat of evaporation.

When switching from cooling to heating again, the supply of the cooling liquid to the cooling chamber is stopped, hot water is supplied from the hot water supply pipe to the cooling chamber, and then the heating steam is supplied to the steam chamber, so that the steam is quickly supplied. Can be switched to heating.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In this embodiment, an example in which the reactor 1 is used as a heat exchanger will be described.
The heating and cooling device is constituted by the reactor 1 and the jacket 2 as a steam chamber, and the cooling chamber 3 formed between the jacket 2 and the reactor 1. A steam pipe 5 is connected to the jacket 2 via a valve 4.

The reactor 1 as a heat exchanger has an inlet 6 to be heated and cooled, an outlet 7 to be heated and a stirrer 8 as in the conventional reactor. A condensate outlet 9 is provided at a lower portion of the jacket portion 2 to condense the heated steam to be condensed and discharged.

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

The ejector-vacuum pump 22 includes a nozzle 2
It comprises an ejector 25 consisting of a diffuser 3 and a diffuser 24, a tank 26, and a spiral pump 27. Tank 26
Is connected to the suction port of the spiral pump 27, and the discharge port is connected to the nozzle portion 23 of the ejector 25. Ejector
The type vacuum pump 22 circulates the fluid in the tank 26 by the vortex pump 27 and passes the fluid to the nozzle 23,
The suction force is generated in the nozzle portion 23. A surplus liquid discharge passage 29 is connected via a valve 28 to a circulation passage connected to the discharge port of the volute pump 27. In the present embodiment,
The passage 36 is connected to the upper part of the cooling chamber 3 via a valve 35 in the circulation path. 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.
Is connected to the supply pipe 33 branched from.

Next, the operation will be described. When heating the object to be heated in the reactor 1 at a temperature of, for example, about 30 ° C., the valve 1
By opening the valve 0 and driving the ejector type vacuum pump 22 while supplying the cooling liquid to the cooling chamber 3, the inside of the cooling chamber 3 is depressurized, and the heating steam of 100 ° C. or more is supplied to the jacket portion 2. It can be done by doing. The heating temperature can be adjusted by controlling the suction force by adjusting the amount of the cooling liquid supplied to the tank 26 with the temperature of the fluid passing through the nozzle portion 23 of the ejector-type vacuum pump 22, and The temperature of the supplied steam can be adjusted by adjusting the opening of the valve 4.

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

When the reactor 1 is cooled, the supply of steam is stopped by closing the valve 4 and the valve 10 is opened while the ejector-type vacuum pump 22 is driven to supply the cooling liquid into the cooling chamber 3. By doing so, the inside of the cooling chamber 3 is brought into a reduced pressure state, so that the heat of the reaction vessel 1 is taken out, and the reaction vessel 1 can be cooled with latent heat of evaporation caused by vaporization of the cooling liquid. In this case, the remainder of the vapor and the cooling liquid vaporized by the cooling 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, and the valve 39 is opened to supply the hot water to the cooling chamber 3, and the valve 4 is opened to supply the heating steam to the jacket portion 2, so that one of the hot water is supplied. The heat of the section and the heat of the steam immediately heat the reaction vessel 1, so that it is possible to quickly switch to heating without requiring time.

In this 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 heated by the steam at the time of heating can be supplied to the cooling chamber 3 instead of the hot water from the hot water supply pipe 40.

[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 via the cooling chamber, and is thereby excessively heated. No heat damage occurs, and heating can be performed at a low temperature. Also, there is no clogging because there is no intervening porous member as in the prior art,
Therefore, the heating temperature can be accurately maintained over a long period of time.

According to the present invention, by connecting the hot water supply pipe to the cooling chamber, when switching from cooling to heating,
Hot water can be supplied to the cooling chamber in advance, and switching to heating can be quickly performed without requiring time.

[Brief description of the drawings]

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reaction vessel 2 jacket part 3 cooling chamber 5 steam pipe 11 cooling liquid supply pipe 13 steam trap 22 ejector type vacuum pump 23 nozzle part 25 ejector 26 tank 27 spiral pump 40 hot water supply pipe

Claims (1)

(57) [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 cooling chamber, a cooling liquid supply pipe and a hot water supply pipe are connected to the cooling chamber via a valve, and suction means for maintaining the cooling chamber in a reduced pressure state is connected. Heating and cooling equipment.