JPH0581296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heating and cooling device that performs heating and cooling using a single heat exchange member. Examples of the above-mentioned heating and cooling devices include various reaction vessels, food distillation devices, and sterilization devices.

<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, with a raw material inlet 2, a product outlet 3, a stirrer 4,
It has a jacket part 5. The jacket part 5 is provided with fluid supply and discharge ports 6 and 7 for heating and cooling, one of which is connected to a cooling water supply pipe 8 and a drain discharge pipe 9, and the other is connected to a steam supply pipe 10 and a cooling water supply pipe. Connect the water discharge pipe 11, and place a valve V in the middle of each pipe.
1, V2, V3, and V4 are provided. When heating the raw materials in this reaction vessel 1, valves V2 and V4 are closed and valves V1 and V3 are opened. As a result, steam is supplied into the jacket portion 5 from the pipe 10 and the fluid supply/discharge port 7, and heating is performed. Drain generated at that time is discharged through the fluid supply/discharge port 6 and the pipe 9. In the figure, 12 is a steam trap that discharges only the drain.

When cooling, valves V1 and V3 are closed and valves V2 and V4 are opened. This allows cooling water to flow to pipe 8,
The fluid is supplied into the jacket portion 5 through the fluid supply/discharge port 6 for cooling. The supplied cooling water is discharged through the fluid supply/discharge port 7 and the pipe 11.

<Problems to be Solved by the Invention> In the conventional heating/cooling device described above, a hammer phenomenon occurs when heating is performed after cooling or cooling is performed following heating, and the device is damaged by the vibration and impact. However, there is a problem of short life.
The cause of this is that when switching between heating and cooling, the jacket portion 5 and the pipes 8, 9, 1 communicating with the inside thereof
This is because there is a large temperature difference between the temperature of the newly supplied fluid and the temperature of the parts 0 and 11 as well as the temperature of the fluid remaining in these parts.

Furthermore, during cooling, the reaction vessel cannot be cooled uniformly, and local abnormal temperature increases are likely to occur, and this temperature unevenness makes it difficult to maintain a constant quality of the product. The reason for this is that since cooling is performed using cooling water, the cooling is performed only by the sensible heat of the cooling water, and the heat capacity is small.

Therefore, the technical problem of the present invention is to enable a heating and cooling device to reduce the temperature difference when switching between heating and cooling, and to increase the heat capacity during cooling. .

<Means for Solving the Problems> The technical means of the present invention taken to solve the above problems is to communicate the diff user of the ejector and the suction port of the pump through a tank, and to supply cooling water into the tank. A pump device is provided, which includes a control unit that controls water temperature in the tank by supplying the water, a discharge port of the pump that is connected to a nozzle of the ejector, and a discharge means that discharges surplus water circulated by the pump to the outside of the system. , a high-temperature steam outlet of a vortex tube for separating pressurized steam into high-temperature steam and low-temperature steam, and a valve device in communication with the ejector part of the pump device and the steam heating and vaporization cooling chamber, and in the steam heating and vaporization cooling chamber. A steam supply passage is provided through the pump, a water droplet nozzle is arranged to turn a part of the water discharged from the pump into minute water droplets, a second ejector and a diffuser are provided for sucking the minute water droplets generated by the water droplet nozzle, An evaporative cooling passage is provided which connects the low temperature steam outlet of the vortex tube to the nozzle of the second ejector and communicates the second diffuser with the steam heating and evaporative cooling chamber via a valve device.

<Function> As is well known, the vortex tube allows compressed air to flow into the cylindrical vortex tube in a swirling manner, and this rotating air flow creates a pressure-increasing area near the inner wall of the cylinder, creating a region near the axis. Create a depressurized area. The pressurized air becomes high in temperature due to adiabatic compression, and the air in the low pressure region becomes low in temperature due to adiabatic expansion, and flows out from both ends of the swirl tube.

The present invention uses steam as the fluid supplied to the vortex tube, and the pressurized steam supplied to the vortex tube flows out as high-temperature steam from the high-temperature steam outlet, and is heated and evaporatively cooled via a valve device. The steam flows into the chamber and heats the steam. That is, the high temperature steam outlet of the swirl tube is communicated with the steam heating and vaporization cooling chamber by the valve device. The high-temperature steam heats the object to be heated, becomes a drain, is sucked into the ejector, and reaches the inside of the tank.
The water temperature in the tank rises.

When switching from heating to cooling, a valve device connects the low-temperature steam outlet of the vortex tube to the steam heating and vaporization cooling chamber via the nozzle of the second ejector and the diffuser, and also directs a portion of the water discharged from the pump to the water droplet nozzle. It communicates with the second ejector via. The water discharged into minute water droplets from the water droplet nozzle is sucked into and mixed with low-temperature steam by the second ejector, and reaches the steam heating and vaporization cooling chamber. The residual high temperature steam in the steam heating and vaporization cooling chamber and the supplied discharge water are sucked into the ejector and returned into the tank. Therefore, since the discharge water supplied to the steam heating and vaporization cooling chambers is initially at a high temperature, the problematic temperature difference is small, and the residual steam does not suddenly condense and cause the hammer phenomenon. 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 steam heating and evaporative cooling chamber is depressurized by the suction action of the ejector, and as a result, the mixed fluid of discharge water and low-temperature steam supplied by the water droplet nozzle quickly evaporates and evaporatively cools the object to be cooled. .

Next, when switching from cooling to heating, first stop the supply of cooling water into the tank from the evaporative cooling state, then the pump discharge water circulates through the evaporative cooling chamber, the ejector, and the tank, and absorbs the heat from the object to be cooled. The temperature gradually rises due to heat generated by circulation. If the valve device stops the supply of water droplets and low-temperature steam and supplies high-temperature steam when the temperature rises to a certain degree, the temperature difference in question will be small and the steam will not condense rapidly, and the object to be heated will be steam-heated.

<Example> An example showing a specific example of the above technical means will be described. (See Figures 1 to 3) In this example, a reaction vessel is used as the heating and cooling device.

In FIG. 1, 21 is a reaction vessel, 22 is a pump device, 23a and 23b are valve devices, 24 is a water temperature control section, 25 is an excess water discharge means, 26 is a vortex tube, and 27
is a second ejector, and 28 is a water droplet nozzle.

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

In the pump device 22, 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 differential user 34 of the ejector 32.
is connected to the upper space of the tank 31, and the ejector 32 and the fluid discharge port 7 of the reaction vessel 21 are connected. This pump device 22 is
By operating the pump 30, water in the tank 31 is supplied to the ejector 32, subjected to suction, and returned to the tank 31.

The valve device 23a is connected to the high temperature steam outlet 3 of the swirl tube 26.
5 and the fluid supply port 6 of the reaction vessel 21. When the valve is shut off, high-temperature steam is discharged from the discharge pipe 36 or supplied to separately used equipment. Similarly, the valve device 23b connects the low temperature steam outlet 37 of the swirl tube 26 and the fluid supply port 6 to the second nozzle 38.
It is a three-way valve that communicates or shuts off communication with the differential user 39. The valve devices 23a and 23b are opened and closed by signals from the control section 29.

The water temperature control section 24 is provided to control the water temperature in the tank 31, and is designed to perform control by supplying cooling water into the tank 31. Cooling water supply pipe 40 connected to tank 31
An electric on-off valve 70 is provided in the middle of the tank, and is opened and closed by a signal from a temperature sensor 41 that detects the water temperature in the tank.

The surplus water discharge means 25 includes an electric on-off valve 71 attached to a part of the pump device 22, and maintains the water level in the tank 31 within a predetermined range based on signals from water level sensors 42a and 42b in the tank 31.

As shown in the enlarged cross-sectional views in FIGS. 2 and 3, the vortex tube 26 has a pressurized steam inlet 60 at one end, a low-temperature steam outlet 37 via a partition plate member 61, and a low-temperature steam outlet 37 at the other end. A high temperature steam outlet 35 is formed therein. Steam flowing in from the pressurized steam inlet 60 flows through a plurality of grooves 62 (third
(see figure), the liquid is injected in the tangential direction of the inner wall of the vortex tube 26. Therefore, a vortex is created in the vortex tube 26, and the low temperature steam flows from the low temperature steam outlet 37 and
The hot steam exits from the hot steam outlet 35.

The water droplet nozzle 28 turns water discharged from the pump 30 into minute water droplets, and is connected to the pump 30 via a valve 72. The outer periphery of the water droplet nozzle 28 is covered with a closed tank 73, and the upper part of the closed tank 73 is communicated with the second ejector 27.

The valve 75 is for supplying or blocking pressurized steam from the pressurized steam pipe 80, and the valve 76 is for supplying or blocking compressed air from the compressed air pipe 81.

When heating the reaction vessel 21, the valve 75 opens in response to a signal from the control section 29, and the valve device 2
3a communicates the high temperature steam outlet 35 and the fluid supply port 6, the valve device 23b blocks the low temperature steam outlet 37 and the fluid supply port 6, and discharges the low temperature steam to the outside of the system, and the other valves are closed. The pressurized steam from the pressurized steam pipe 80 reaches the vortex tube 26, becomes high-temperature steam, and is supplied to the jacket portion 5 to heat the reaction vessel 21 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, and the electric on-off valve 71 opens to discharge excess water to the outside of the system. The water temperature in the tank 31 rises due to the inflow of drain.

When switching from heating to cooling, the valve device 23a
The high temperature steam outlet 35 and the fluid supply port 6 are shut off, and the low temperature steam outlet 37 and the fluid supply port 6 are communicated with each other by the valve device 23b, and the valve 72 is also opened. As a result, the supply of high-temperature steam is stopped, and a portion of the water discharged from the pump 30 becomes minute water droplets in the water droplet nozzle 28, is sucked into low-temperature steam in the second ejector 27, becomes a mixed fluid, and is supplied to the jacket section 5. . The mixed fluid and residual high temperature steam supplied to the jacket part 5 are sucked by the ejector 32 and transferred to the tank 31.
leading to. At the initial stage of switching from heating to cooling, the water discharged from the pump 30 is at a high temperature during heating, so the residual high temperature steam does not rapidly condense. Therefore, no hammer phenomenon occurs in this case. By supplying cooling water into the tank 31, the water temperature within the tank 31 gradually decreases. As the water temperature decreases, the suction action, ie, the degree of pressure reduction, generated in the ejector 32 increases, and the pressure inside the jacket portion 5 is also reduced. When the pressure inside the jacket section 5 is reduced, the supplied mixed fluid of water droplets and low-temperature steam is vaporized by the heat of the reaction vessel 21 and cooled. The mixed fluid is minute water droplets and is more easily evaporated, allowing uniform and rapid evaporative cooling.

The degree of pressure reduction within the jacket portion 5 can be adjusted by controlling the water temperature in the tank 31.

If you want to lower the cooling temperature even further than evaporative cooling using a mixed fluid of low-temperature steam and water droplets, use compressed air pipe 8.
It is also possible to supply compressed air from 1 to the vortex tube 26 and cool it as a mixed fluid of low-temperature air and water droplets.

When switching from cooling to heating, the electric on-off valve 70 of the cooling water supply pipe 40 is closed to stop the supply of cooling water. The fluid circulates through the tank 31, the pump 30, the jacket part 5, and the ejector 32, and is gradually heated up by the heat from the reaction vessel 21 and the heat generated by the circulation. When the water temperature rises to a certain degree as detected by the temperature sensor 41, the valve 72 is closed, the low temperature steam outlet 37 and the fluid supply port 6 are shut off by the valve device 23b, and the high temperature steam outlet 35 and the fluid supply port 6 are shut off by the valve device 23a. communicate. High-temperature steam is supplied to the jacket portion 5, but since the fluid temperature within the jacket portion 5 at this time is rising, rapid condensation of the high-temperature steam does not occur, and no hammer phenomenon occurs.

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

<Effects of the Invention> According to the present invention, when switching from heating to cooling or from cooling to heating, the temperature of the fluid supplied to the steam heating and vaporization cooling chambers is gradually changed to prevent rapid condensation of steam. Therefore, the hammer phenomenon does not occur, and damage to the heating/cooling device and shortening of its lifespan can be prevented. Furthermore, since the cooling chamber is depressurized and evaporatively cooled during cooling, a large heat capacity can be secured, uneven cooling can be prevented, and product quality can be maintained at a constant level. Furthermore, during cooling, by turning pump discharge water into minute water droplets and supplying them to the cooling chamber together with low-temperature steam, the cooling water becomes water droplets and mist, and uniform and rapid evaporative cooling can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the steam heating and evaporative cooling device of the present invention, and FIG.
3 is an enlarged sectional view of the vortex tube 26 shown in the figure, FIG. 3 is a sectional view taken along the line A--A in FIG. 2, and FIG. 4 is a schematic configuration diagram showing an example of a conventional heating/cooling device. 5...Jacket part, 6...Fluid supply port, 22
...Pump device, 23a, 23b...Valve device, 2
4... Water temperature control section, 25... Excess water discharge means, 2
6... Vortex tube, 27... Second ejector, 28...
Water drop nozzle, 30...pump, 31...tank,
32...Ejector, 35...High temperature steam outlet, 37
...Low temperature steam outlet.

Claims (1)

[Claims] 1. A control unit is provided that communicates the diff user of the ejector and the suction port of the pump via a tank, supplies cooling water into the tank, and controls the water temperature in the tank,
A pump device is provided in which the discharge port of the pump is connected to the nozzle of the ejector, and is provided with a discharge means for discharging surplus water circulated by the pump to the outside of the system, and the ejector portion of the pump device and the steam heating and vaporization cooling chamber are connected to each other. A steam supply passage is provided in the steam heating and vaporization cooling chamber through a valve device and a high-temperature steam outlet of a vortex tube that separates pressurized steam into high-temperature steam and low-temperature steam. A water droplet nozzle that converts a part of the water into minute water droplets is provided, a second ejector and a diffuser are provided to suck the minute water droplets generated by the water droplet nozzle, and the low temperature steam outlet of the swirl tube is connected to the nozzle of the second ejector. A steam heating and evaporative cooling device, further comprising a evaporative cooling water supply passage that communicates the second diffuser with the steam heating and evaporative cooling chamber via a valve device.