JPS6235594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for extracting a medium attached to a condensing heat transfer surface, and more specifically, to effectively extracting a medium attached to an outer circumferential surface of a condensing tube placed vertically. Regarding equipment.

2. Description of the Related Art A heat transfer promoting device is known in which high voltage metal wires are installed opposite to a condensing heat transfer surface so that the medium condensed and adhered to the heat transfer surface is drawn to the metal wires.

In the above-mentioned known heat transfer accelerator, an important issue is how quickly and easily the medium drawn to the metal wire can be discharged.

That is, when the medium is quickly discharged, the film thickness of the medium remaining on the heat transfer surface becomes thinner, and heat transfer is promoted.

However, the heat transfer surface is a tube, and no suitable discharge means has yet been provided to discharge the medium condensed on the outer peripheral surface of the tube.

Therefore, the present invention and others have already proposed a liquid drawing device for effectively discharging the condensed medium on the outer circumferential surface of the tube in a vertically placed heat transfer tube.

In the previously proposed liquid extraction device, a metal wire serving as an electrode is wound in a spiral around a vertically placed heat transfer tube, and the medium drawn by the metal wire is dropped in a spiral shape and transferred to a separate vertical wire, thereby efficiently drawing it out. It was intended to be eliminated.

However, the single metal wire proposed above has a limit of discharging 85% of the attached medium, and it is difficult to discharge more than that.

An object of the present invention is to study various shapes of metal wires in previously proposed devices, and to provide a drawing device that is efficient in discharging adhesion media.

This will be explained in detail below using figures.

FIG. 1 is a sectional view showing an example of a previously proposed condensing heat exchanger to which the present invention is applied. 2 is an enlarged view of portion A in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.

The condensing heat exchanger 1 has headers 2 and 3 on the upper and lower sides, and the headers 2 and 3 are connected through heat transfer tubes 4. The medium to be condensed enters through the inlet 5 and fills the casing 6. The medium condensed and deposited on the outer peripheral surface of the heat transfer tube 4 is collected at the lower part of the casing 6 and taken out from the outlet 7. A refrigerant for cooling the medium enters from an inlet 8 and flows out from an outlet 9.

The heat exchanger tube 4 is placed vertically, and four vertical lines 10 are provided around the heat exchanger tube in parallel with the heat exchanger tube 4 at approximately equal phase intervals.

In order to fix the vertical line 10, a plurality of ring wires 11 fixed to the vertical line 10 are provided in the vertical direction at appropriate intervals. A spiral 12 made of a metal wire is provided that winds around the heat exchanger tube 4 and advances downward. Spiral 12 is vertical line 1
0, and is installed facing the outer peripheral surface of the heat exchanger tube with a gap of 0.5 to 5 mm.

The lower end of the spiral 12 is fixed to another vertical wire 13 installed a little apart from the heat exchanger tube 4.
A predetermined number of spirals 12 are attached to the heat exchanger tube 4 in the longitudinal direction. This number varies depending on the length of the heat exchanger tube 4 and the spiral length, but the spiral 12
An example is one that is wound 480 degrees and has an installation interval of 50 to 60 mm.

In the device of the present invention configured as described above, the spiral 12 made of metal wire is shaped like a band as follows.

In FIG. 4A, the spiral 12 is composed of a single flat metal wire. Since the flat surface faces the heat exchanger tube 4, the electrode area increases.

B is a spiral 12 made by bundling four square metal wires in a row, and the same effect can be obtained with this.

The operation of the present invention configured as described above is as follows.

First, explanation will be given with reference to FIGS. 1 to 3.

Steam entering from the inlet 5 condenses and adheres to the outer peripheral surface of the heat transfer tube 4. The spiral 12 has a high voltage of 4000V to 15000V, and this voltage is applied via the vertical line 10 or the vertical line 13. The vapor is chlorofluorocarbon, ammonia, organic liquid, etc., and the condensate is drawn to the spiral 12. Therefore, the condensate flows down along the spiral 12 and falls from the end of the spiral 12 to the bottom inside the casing 6. Although the vertical line 13 is not absolutely necessary, it is provided as a guide for the condensate dripping from the end of the spiral 12.

Now, in the present invention, since the spiral 12 is strip-shaped, the amount of liquid shown in Q in the figure is drawn from the outer circumferential surface of the tube as shown in A in FIG. becomes. That is, in the case of a single metal wire as shown in Fig. 4B,
It attracts by Q ₁ , but by making it a band-shaped metal, the amount of attraction increases by Q ₂ .

In addition, although it is preferable that the short axis of the metal strip is 0.5 mm and the long axis is 2 to 4 mm, it is not limited to these values.

According to the present invention, it is possible to draw out 95% of the medium, achieving a high performance that greatly exceeds 85% in the case of a single metal wire.

As described above, according to the present invention, the medium adhering to the outer periphery of the heat exchanger tube is efficiently attracted and discharged, so that it is possible to improve heat transfer efficiency, downsize the heat exchanger, and improve its performance.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing an example of a condensing heat exchanger to which the present invention is applied, Fig. 2 is an enlarged view of part A in Fig. 1, and Fig. 3 is a sectional view taken along line BB in Fig. 2; 4A and 4B are cross-sectional views showing one embodiment of the present invention. 4: heat exchanger tube, 10: vertical line, 12: spiral.

Claims (1)

[Claims] 1. In an apparatus in which a high-voltage metal wire is arranged opposite to the outer circumferential surface of a tube to draw a medium attached to the outer circumferential surface of the tube toward the metal wire, the tube is provided at least in the direction of gravity, and the metal wire is arranged in the direction of gravity. The metal wire is wound around the outer periphery of the tube as a spiral that progresses downward, and the spiral radius increases at the end of the winding and is connected to a vertical wire placed in the same direction as the tube, and the metal wire is strip-shaped and has a flat surface. A liquid drawing device characterized in that the is installed facing the outer circumferential surface of the pipe.