JPH0581297B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heating and cooling device that alternately performs heating and cooling. Examples of the above-mentioned heating and cooling devices include various vulcanizing devices, food washing and sterilization devices, and the like.

<Prior Art> As a conventional heating/cooling device, there is a heating/cooling device as shown in FIG. In the figure, reference numeral 1 denotes a fluid chamber for heating and cooling, and materials to be heated and cooled, such as raw materials, are placed in the fluid chamber and heated and cooled. A steam supply pipe 10 and a cooling water discharge pipe 11 are connected to the fluid chamber 1, and a cooling water supply pipe 8 and a drain discharge pipe 9 are connected to one of them. Valve V1, V2, V3, V in the middle of each pipe
4 is provided. When heating the raw material in this fluid chamber 1, valves V2 and V4 are closed and valves V1 and V3 are opened. As a result, steam is supplied from the pipe 10 into the fluid chamber 1 for heating. Drain generated at that time is discharged through valve V3 and drain discharge 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. As a result, cooling water is supplied into the fluid chamber 1 through the pipe 8 for cooling. The supplied cooling water is discharged through a cooling water discharge 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 when cooling is performed following heating, and the vibration and impact cause the raw material to There is a problem that the objects to be heated and cooled, as well as the equipment, may be damaged. The cause of this is
When switching between heating and cooling, the temperature of the fluid chamber 1 and the portions of the pipes 8, 9, 10, and 11 communicating therein, as well as the temperature of the fluid remaining in each of these portions, is adjusted to the temperature of the fluid that is newly supplied. This is because there is a large temperature difference between the fluid temperatures.

Furthermore, during cooling, the raw material cannot be cooled uniformly, and local abnormal temperature increases tend to occur, and this temperature unevenness makes it difficult to maintain constant product quality. 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 supply passage and a valve device for communicating the ejector portion of the pump device with a fluid chamber for steam heating and vaporization cooling, and for selectively supplying heating steam and a portion of water discharged from the pump to the fluid chamber; It has been established.

<Function> When heating the raw material, steam is supplied to the fluid chamber by the valve device. The steam heats the raw material and becomes drain, which is sucked into the ejector and reaches the tank, increasing the water temperature in the tank.

When switching from heating to cooling, the valve device stops the supply of steam and supplies part of the pump discharge water to the fluid chamber. The residual high temperature steam in the fluid chamber and the supplied discharge water are sucked into the ejector and returned into the tank. Therefore, since the discharge water supplied to the fluid chamber is initially at a high temperature, the temperature difference in question is small;
Residual steam will not rapidly condense and cause a hammer effect. 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 fluid chamber is depressurized by the suction action of the ejector, and the discharged water thus supplied quickly vaporizes 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, and the water discharged from the pump circulates through the fluid chamber, ejector, and tank, and the heat from the object to be cooled and The temperature gradually rises due to the heat generated by circulation. When the temperature rises to a certain degree, if the valve device stops the supply of discharged water to the fluid chamber and supplies heated steam, the temperature difference in question will be small and the steam will not suddenly condense, and the object to be heated will be heated by the steam. Ru.

<Example> An example showing a specific example of the above technical means will be described. (See Figure 1) In Figure 1, numeral 21 denotes a fluid chamber for steam heating and evaporative cooling into which raw materials are inserted. 22 is a pump device, 23a and 23b are valve devices, and 24 is a water temperature control section.

A steam supply passage 27 and a discharge water supply passage 28 are connected to the fluid chamber 21 via valve devices 23a and 23b. The valve devices 23a and 23b are automatic valves that open and close according to signals from the control section 29.

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 chamber 21 are connected via a capacitor 50. This pump device 2
2 is configured to supply water in a tank 31 to an ejector 32 by operation of a pump 30, cause it to be suctioned, and return it to the tank 31.

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 automatic 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. One end of the automatic valve 70 is also connected to the lower part of the capacitor 50. Reference number 51 is a cooling water discharge pipe from the condenser 50.

The surplus water discharge means 25 has an automatic valve 71 attached to a part of the pump device 22, and the tank 3
1 to maintain the water level within a predetermined range.

When heating the fluid chamber 21, the valve device 23a opens in response to a signal from the control unit 29 to supply steam to the fluid chamber 21, thereby heating the raw material with steam.
Drain generated by heating is sucked into the ejector 32 and reaches the tank 31. Tank 3 by drain
When the water level in the tank 1 reaches the upper limit water level, the water level sensor 42a detects this, and the automatic 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 supply of steam is stopped, the valve device 23b is opened, and a portion of the water discharged from the pump 30 is supplied to the fluid chamber 21. The discharge water and residual steam supplied to the fluid chamber 21 are sucked by the ejector 32 and reach the tank 31. In the initial stage of switching from heating to cooling,
Since the water discharged from the pump 30 is heated to a high temperature, the residual high temperature steam does not suddenly 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 fluid chamber 21 is also reduced. When the pressure in the fluid chamber 21 is reduced, the supplied discharge water is vaporized by the heat of the raw material and cooled.

The vaporized discharged water is condensed again in the condenser 50 and sucked into the ejector 32.

The degree of pressure reduction in the fluid chamber 21 can be adjusted by controlling the water temperature in the tank 31.

When switching from cooling to heating, the automatic valve 70 of the cooling water supply pipe 40 is closed to stop the supply of cooling water. Fluid is in tank 31, pump 30, fluid chamber 2
1. The material is circulated through the ejector 32, and the temperature is gradually raised by the heat from the raw material and the heat generated by the circulation. Temperature sensor 41
When the water temperature rises to a certain extent by detection of
supply to. Steam is supplied to the fluid chamber 21,
Since the fluid temperature in the fluid chamber 21 at this time is rising, rapid condensation of steam does not occur, and no hammer phenomenon occurs.

<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 fluid chamber can be gradually changed to prevent rapid condensation of steam. Hammer phenomenon does not occur, and damage to raw materials and heating/cooling equipment 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.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic structure of an embodiment of a steam heating and evaporative cooling device of the present invention, and FIG. 2 is a schematic block diagram showing an example of a conventional heating and cooling device. 21...Fluid chamber, 22...Pump device, 23
a, 23b... Valve device, 24... Water temperature control section, 2
5... Surplus water discharge means, 27... Steam supply passage,
28...Discharge water supply passage, 30...Pump, 31
... Tank, 32 ... Ejector, 33 ... Nozzle, 40 ... Cooling water supply passage, 50 ... Condenser.

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 that connects the discharge port of the pump to the nozzle of the ejector and is equipped with a discharge means for discharging surplus water circulated by the pump to the outside of the system, and is connected to the ejector portion of the pump device for steam heating and evaporative cooling. A steam heating and evaporative cooling device that communicates with a fluid chamber and is provided with a supply passage and a valve device so that heating steam and a portion of water discharged from the pump can be selectively supplied to the fluid chamber.