JPH03101830A - Steam heating and vaporization cooling device - Google Patents

Abstract

PURPOSE:To eliminate temp. unevenness of heating and cooling by communicating the suction port of a pump with the diffuser of an ejector via a tank and connecting the discharge port of the pump to the nozzle of the ejector. CONSTITUTION:The suction side of a pump 30 in a pump device 22 is connected to a tank 31 and the discharge side thereof is connected to the nozzle 33 of an ejector 32. The diffuser 34 of the ejector 32 is connected to the upper space of the tank 31. The pump device 22 supplies water in the tank 31 to the ejector 32 by actuation of the pump 30 and performs sucking action of water and returns water to the tank 31. A valve device 26 is a motor-operated valve which is fitted to a cooling water supplying path 28 and supplies one part of discharged water of the pump 30 to a jacket part 5 or interrupts it. This valve device performs opening and closing action by a signal sent from a controlling part 29. When a reaction pot 21 is heated, a motor-operated valve 75 is opened by the signal sent from the controlling part 29. Water becomes the reduced steam and is supplied to the jacket part 5 and the reaction pot 21 is heated.

Description

[Detailed description of the invention] Industrial application field> The present invention relates to a heating and cooling device that performs heating and cooling, and in particular,
The present invention relates to a steam heating and evaporative cooling device that performs low-temperature steam heating and reduced pressure evaporative cooling. The above-mentioned heating and cooling devices include various reaction vessels, food distillation devices, overflow devices, sterilization devices, etc., and the heating temperature is often relatively low, usually 100° C. or less.

<Prior Art> As a conventional heating/cooling device, there is a heating/cooling device for a reaction vessel shown in FIG. In the figure, 1 is a reaction vessel, which has a raw material population 2, a product outlet 3, an agitator 4, and a jacket part 5. The jacket part 5 has fluid supply and discharge ports 6 and 7 for heating and cooling! The cooling water supply pipe 8 and the hot water discharge pipe 9 are connected to one side, and the hot water supply pipe 1 is connected to the other side.
0 and cooling water discharge pipe 11, and install a valve V1 in the middle of each pipe.
, v2, V3, and v4 are provided. When heating the raw material in reaction pot 1 by 1J, close valves V2 and V4, and close valve v1.
, open v3. As a result, hot water is supplied into the jacket portion 5 from the pipe 10 and the fluid supply/discharge port 7 to perform 7JO heat, and is discharged through the hot water discharge pipe 9.

Also, when cooling, close valves v1 and V3, and close valves V2 and V3.
Open 4. As a result, cooling water is supplied into the jacket portion 5 through the pipe 8 and the fluid supply/discharge port 6, thereby performing cooling. The supplied cooling water is discharged through the fluid supply/discharge port 7 and the pipe 11.

<Problem to be solved by the invention> The above-mentioned conventional heating/cooling device has the following problems during heating and cooling:
The reaction vessel, which is the object to be heated and cooled, cannot be uniformly heated and cooled, and local abnormally low temperatures or abnormally high temperatures are likely to occur, and this temperature unevenness makes it difficult to maintain constant product quality. This is because the raw prisoner is heated by hot water and cooled by cooling water, so it is heated or cooled only by the sensible heat of the water and has a small heat capacity.

Therefore, a technical problem of the present invention is to eliminate temperature unevenness in heating and cooling by increasing the heat capacity during heating and cooling in a low-temperature heating and cooling device.

<Means for solving the problems> The technical means of the present invention taken to solve the above problems are as follows:
The diffuser of the ejector and the suction port of the pump are connected through a tank, and a control section is provided for supplying cooling water into the tank to control the water temperature in the tank, and the discharge port of the pump is connected to the suction port of the evictor. A pump device connected to the nozzle and equipped with a discharge means for discharging surplus water circulated by the pump to the outside of the system is provided, and the evictor section of the pump device and the heating and cooling fluid chamber of the steam heating and evaporative cooling device are connected to each other. A steam supply passage that supplies heated steam through a pressure reducing valve that communicates with the pressure-responsive member that detects the secondary pressure and receives a set load in the same direction as the secondary pressure applied to the pressure-responsive member. A cooling water supply passage communicating with the fluid chamber and supplying a portion of water discharged from the pump to the fluid chamber via a valve device is provided.

<Function> When heating the eyes, listen to the steam supply passage that supplies heated steam to the fluid chamber via the pressure reducing valve. The pressure-reducing valve has a structure in which the pressure-responsive member that detects the secondary pressure receives a set load in the same direction as the applied secondary pressure, so the secondary pressure of the pressure-reducing valve is equal to atmospheric pressure. It can be adjusted even in the following vacuum conditions, and the secondary side pressure is maintained at a predetermined vacuum pressure.Therefore,
A predetermined amount of vacuum steam is supplied from the secondary side of the pressure reducing valve into the fluid chamber by the suction action of the pressure reducing valve and the ejector.
The object to be heated is heated with low-temperature steam below °C. The heated steam becomes drain and is sucked into the ejector.

When switching from heating to cooling, close the steam supply passage and
A portion of the pump discharge water is supplied to the fluid chamber by listening to the valve device of the cooling water supply passage. Cooling water is then supplied into the tank to gradually lower the temperature of the water circulating in the pump. When the water temperature decreases, the suction effect of the ejector increases, the fluid chamber is depressurized, and a portion of the discharged water quickly evaporates to evaporatively cool the object to be cooled.

Embodiments ``An embodiment illustrating a specific example of the above technical means will be described. (
(See FIGS. 1 and 2) In this example, a reaction vessel is used as a heating and cooling device.

In Fig. 1, 21 is a reaction vessel, 22 is a pump device, 2
3 is a pressure reducing valve, 24 is a water temperature control section, 25 is an excess water discharge means, 26 is a valve device, 27 is a steam supply passage, and 28 is a cooling water supply passage.

The reaction vessel 21, like the conventional one, has a raw material population 2, a product outlet 3, stirring @ 4, and a jacket part 5 as a fluid chamber for steam heating and vaporization cooling. A fluid supply port 6 and a fluid discharge port 7 for heating and evaporative cooling are provided.

The pump device 22 is a pump device in which a pump 30 has 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 connected to an upper space of the tank 31. The ejector 32 and the fluid discharge tank 7 are connected to each other. This pump device 22 supplies water in a tank 31 to an ejector 32 by operating a pump 30 to apply suction to the tank 31.
It is set to return to .

As shown in FIG. 2, the pressure reducing valve 23 has an inlet 50, a main valve 54, and an outlet 518, and is provided with a diaphragm 52 as a pressure responsive member. The communication hole 53 is formed so that
A pressure setting spring 56 in a tensioned state is attached, and a drive section 57 for changing the spring load of the pressure setting spring 56 is provided. The inlet 50 is connected to the steam supply passage 27 side (see FIG. 1).

The valve device 26 is an electric valve attached to the cooling water supply passage 28 to supply or cut off a portion of water discharged from the pump 30 to the jacket portion 5, and is opened and closed by a signal from the control portion 29.

The water temperature control section 24 is provided to control the water temperature in the tank 31, and is designed to perform the control by supplying cooling water into the tank 31. An electric valve 70 is provided in the middle of the cooling water supply pipe 40 connected to the tank 31,
It opens and closes in response to a signal from a temperature sensor 41 that detects the water temperature in the tank.

The surplus water discharge means 25 includes an electric valve 71 attached to a part of the pump device 22, and water level sensors 42a and 4 in the tank 31.
The water level in the tank 31 is maintained within a predetermined range by the signal from 2b.

The electric valve 75 is attached to the steam supply passage 27 to supply or cut off steam, but it is not necessarily necessary if the pressure reducing valve 23 has a full opening function.

Electrically operated valves 70, 71, 75 other than the valve device 26 and pressure reducing valve 2
3 is also connected to the control section 29 to enable centralized control.

When heating the reaction vessel 21 with zero force, the electric valve 75 is opened in response to a signal from the control unit 29, and the vacuum steam is supplied to the jacket unit 5 via the pressure reducing valve 23, and the reaction vessel 2 is heated.
1 is heated with steam. Drain generated by heating is sucked into the ejector 32 and reaches the tank 31. When the water level in the tank 31 reaches the upper limit water level due to draining, the water level sensor 42a detects this, the electric valve 71 opens, and the excess water is discharged out of the system.

When switching from heating to cooling, the electric valve 75 is closed to stop the supply of vacuum steam, the valve device 26 is opened, and the pump 3
A part of the water discharged from 0 is supplied to the jacket part 5. By supplying cooling water into the tank 31, the tank 31
The water temperature inside gradually decreases. As the water temperature decreases, the suction action, ie, the degree of pressure reduction, generated in the ejector 32 increases, and the inside of the jacket portion 5 is also reduced in pressure. When the inside of the jacket part 5 is depressurized, the supplied discharge water is vaporized by the heat of the reaction vessel 21 and cooled.

The degree of pressure reduction within the jacket portion 5 can be controlled by adjusting the water temperature of the tank 31 and the set pressure of the pressure reduction valve 23.

In this embodiment, a reaction pot is used as the steam h0 heat and vaporization cooling device, but other distillation devices, concentration devices, sterilization devices, etc. can be used in the same manner.

<Effects of the Invention> According to the present invention, even when heating at a low temperature of 100'C or less, heating can be performed using vacuum steam, and a very large heat capacity can be secured compared to hot water. Moreover, since the cooling chamber is depressurized and evaporatively cooled during cooling, a large heat capacity can be ensured.

Therefore, uneven heating and cooling can be prevented and the quality of the product can be maintained constant.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the steam heating and evaporative cooling device of the present invention, FIG. 2 is a schematic configuration diagram of the pressure reducing valve 28 in FIG. 13, and FIG. 1 is a schematic configuration diagram showing an example of a device. 5: Jacket section 6: Fluid supply port 22: Bump device 23: Pressure reducing valve 24: Water temperature control section 25: Excess water discharge means 26: Valve device 27: Steam supply passage 28: Cooling water supply passage 30: Pump 31: Tank 32 : Ejector 'suitable 1)'';+7

Claims (1)

[Claims] 1. The diffuser of the ejector and the suction port of the pump are connected through a tank, and a control unit is provided for supplying cooling water into the tank to control the water temperature in the tank, and the discharge port of the pump is connected to the nozzle of the ejector. A pump device is provided with a discharge means for discharging excess water circulated by the pump to the outside of the system, and the ejector section of the pump device is connected to the heating and cooling fluid chamber of the steam heating and evaporative cooling device. The steam supply passageway for supplying heated steam is provided with a pressure responsive member for detecting the secondary side pressure, and a pressure reducing valve that receives a set load in the same direction as the secondary side pressure applied to the pressure responsive member. A steam heating and evaporative cooling device comprising a cooling water supply passage communicating with a fluid chamber and supplying a portion of water discharged from the pump to the fluid chamber via a valve device.