JPS584274B2 - netsubaijiyoukihatseisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a heating device that heats an object to be treated using heat medium vapor, such as a heat treatment device for synthetic fibers.

More specifically, the heating medium liquid is poured into the inner bottom of the heating medium liquid container,
This heating device has a heat medium vapor chamber formed on the free surface of the heat medium liquid.

Conventionally known devices of this type include a condensing tank connected to the upper part of a closed container, a heat medium liquid container connected to the lower part, and an electric heater in the heat medium liquid stored in the heat medium liquid container. It was an immersive experience.

However, while such devices have various advantages, they also have the following disadvantages.

That is, since the heat medium liquid is heated by convection caused by the electric heater, a large amount of heat medium liquid is first required.

Furthermore, as mentioned above, the electric heater heats the surrounding heat medium liquid, raises the temperature of the entire heat medium liquid by convection, and evaporates when it reaches the evaporation temperature, so it takes time to evaporate. It takes.

In addition, since the heat transfer liquid is heated below the liquid level, bumping phenomenon tends to occur, and the droplets at this time scatter and collide directly with the heat exchange surface of the heating device, causing the temperature of this part to locally increase. let it rise;
Temperature irregularities could occur.

Furthermore, the low boiling point substances in the heat medium vapor generated remain in the upper interior of the vertical closed container, and the speed of transfer to the condensing tank is slow, which may cause temperature unevenness in the upper and lower portions of the heat exchange surface. there were.

This invention is intended to solve the above problems.

To explain this with reference to the diagram, a plurality of vertical sealed containers 1 are arranged at equal intervals, and the upper part of each vertical sealed container 1 is communicated with one horizontally long condensation tank 2 through a pipe 20. A narrowed portion 21 is formed in the pipe 20.

Further, the lower part of the vertical closed container 1 is communicated with one horizontally long heat medium liquid container 3, and the condensing tank 2 and the horizontally long heat medium liquid container 3 are connected through a return pipe 22.

Next, a heat medium liquid 5 is stored in the horizontally long heat medium liquid container 3, and a horizontally long electric heater 4 is provided along the free surface of the heat medium liquid 5. Immerse in liquid 6,
The upper surface portion 7 is exposed to the heat medium vapor chamber 9 on the free surface 8 of the heat medium liquid 5, and a heat-resistant porous layer 10 is further formed around the outer periphery of the electric heater 4.

The space 11 formed between the outer periphery of the electric heater 4 immersed in the heat transfer liquid 5 and the porous layer 10 is filled with the heat transfer liquid 5, and the free surface 8 of the heat transfer liquid 5 is The thin space formed between the exposed outer surface of the heating wire 4 and the porous layer 10 is also filled with the heating medium liquid 5 due to capillarity.

In this way, the entire outer surface of the electric heater 4 is covered with a thin layer of heat transfer liquid 5.

The electric heater 4 has a heating wire 15 and a heat-resistant electric insulator 16 inside thereof, and when electricity is passed through the heating wire 15 to raise the temperature of the electric heater 4, the thin layer heat medium liquid 5 in the space 12 changes. It is heated while in surface contact with the electric heater 4.

That is, a small amount of the heat medium liquid in the form of a thin film is heated by conduction heat from the electric heater 4, is immediately vaporized, and rises to the steam chamber 9 as vapor.

At the same time that the heating medium liquid 5 in the space 12 turns into vapor, the heating medium liquid 5 present in this space 12 below the free surface 8 of the heating medium liquid 5 is replenished by capillary action.

Evaporation of the thin film heat medium liquid 5 in the space 12 and replenishment by capillary action are performed simultaneously and continuously, filling the steam chamber 9 with heat medium vapor and further communicating with the steam chamber 9. The steam chambers 14 in the plurality of vertical closed containers 1 are also filled.

The object to be treated that is in contact with the heat exchange surface 17 is heated by the heat of the heat medium vapor existing in the steam chamber 14 of the vertical closed container 1 .

The heat medium vapor whose temperature has decreased due to the heat exchange action at this time is liquefied again, falls inside the container 1, and returns to the heat medium container 3.

Therefore, the amount of the heat transfer liquid 5 does not change and the lower surface 6 of the electric heater 4
It is sufficient if the amount can be immersed in the water, and it is economical since only a very small amount is required.

A thread threading groove 18 is formed as necessary on the heat exchange surface 17 of the vertical closed container 1 to serve as a guide for the thread 19 to be heat treated.

Further, as described above, the upper part of each vertical closed container 1 and the horizontally long condensing tank 2 are communicated with each other through the pipe 20.

Next, since the horizontally elongated condensing tank 2 has less heat insulation measures than other parts, the temperature decreases due to natural heat radiation to the outside, and the heat medium vapor in the condensing tank 2 is cooled and condensed. The pressure decreases, and the heat medium vapor in the vertical closed container 1 is sucked into the horizontal condensing tank 2.

Also, since the narrowed portion 21 is formed inside the pipe 20,
Since the heat medium vapor passes through a passage having a small cross-sectional area in the narrowed portion 21, the velocity in this portion increases as shown by vector V as shown in FIG.

Therefore, the heat medium vapor above the vertical closed container 1 is guided by the above-mentioned rapid flow, flows along the streamline S shown by the dotted line, and does not accumulate in one place.

Therefore, the low boiling point substance that tends to accumulate in the upper part of the vertical closed container 1 is guided into the horizontally long condensing tank 2, and the low boiling point substance and the heat transfer liquid are separated by the condensation temperature difference.

The liquefied heat medium liquid is returned into the horizontally elongated heat medium liquid container 3 through a return pipe 22 that communicates the condensation tank 2 with the heat medium liquid container 3.

Note that 23 is a discharge pipe for discharging impurity gas of a low boiling point substance, and its tip 24 is normally sealed off.

Since the present invention is configured as described above, it is possible to solve the problems of the prior art.

That is, the thin film heat medium liquid 5 that is in surface contact with the electric heater 4 is heated by a high heat conduction effect, and the heat medium liquid 5 is immediately evaporated without being circulated by convection. Evaporation takes place in a short time.

Then, the evaporated heat medium vapor is immediately released into the steam chamber 9 little by little.
Therefore, the bumping phenomenon is prevented.

Therefore, it is possible to prevent the temperature of the heat exchange surface from fluctuating due to the scattering of droplets due to the bumping phenomenon.

Furthermore, since the upper part of the electric heater 4 is exposed on the free surface, only a very small amount of heat medium liquid is required in the heat medium container.

Also, due to the natural heat dissipation of the horizontally elongated condensing tank 2, the heat medium vapor in the tank is cooled and condensed, the vapor pressure becomes low, and a suction effect is produced in the condensing tank 2. In particular, the rapid flow from the narrowed part 21 causes the vertical Since the low boiling point substances that tend to accumulate in the upper part of the long sealed container 1 can be guided into the horizontally long condensing tank 2, the temperature unevenness in the vertical closed container 1 caused by the low boiling point substances can be eliminated.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Figure 1 is a partially cutaway perspective view of the heating device using heat medium vapor of the present invention, and Figure 2 is an enlarged view of the section marked by ■-■ in Figure 1. cross section,
FIG. 3 is a detailed view of a portion of FIG. 2, and FIG. 4 is an enlarged view of the upper part of FIG. 1...Vertical sealed container, 2...Horizontal condensation tank, 3...
Heat medium liquid container, 4... Electric heater, 5... Heat medium liquid, 1
0...Heat-resistant porous layer, 20...Pipe, 21...
・Narrow squeeze area.

Claims (1)

[Claims] 1. The lower portions of the plurality of vertical sealed containers 1 are communicated with a horizontally elongated heat medium liquid container 3, the upper portions of the vertical sealed containers 1 are communicated with a horizontal recondensing tank 2 that naturally radiates heat, and Narrowing part 21
A heat medium liquid 5 is stored in the lower part of the heat medium liquid container 3, and an electric heater 4 is provided along the free surface 8 of the heat medium liquid 5. The lower surface of the heat-resistant porous layer 10 is immersed in the heat transfer liquid 5, and the upper surface of the heat-resistant porous layer 10 is placed on the free surface 8 of the heat transfer liquid 5. A heat medium steam generator characterized by being exposed to.