JPH0456239B2 - - Google Patents

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) This invention electrically removes a condensate film that forms on the outer periphery of a condensing tube used in a cooler, etc. to remove condensation heat. The present invention relates to a condensing heat transfer promoting device that improves the transfer rate.

(Prior art) Electrodes are placed around the condensing tube of a heat exchanger, and a high voltage is applied between the electrode and the condensing tube. Techniques have already been proposed that attempt to improve the efficiency of heat exchangers by guiding the generated condensate film to the electrode side and removing the liquid film on the condensing surface (for example, Japanese Patent Application Laid-Open No. 1983-42096, Special Publication No. 59-41117-8).

In this technique, it is necessary to keep the condensing surface and the electrodes apart so that a certain gap is formed between them, and furthermore, it is necessary to minimize the area of the condensing surface covered by the electrodes. Therefore, wire-shaped electrodes are generally used. In addition, the condensate that has attracted and adhered to the electrode must be removed from the condensation surface one after another, otherwise it is not desirable to improve the heat transfer coefficient during condensation. The condensate is wound in a spiral so that the helical angle increases as it goes downwards, and centrifugal force is generated by using the falling speed of gravity acting on the condensate, and this centrifugal force causes condensation. The liquid is drained outward.

(Problem to be Solved by the Invention) In order to discharge the condensate by winding the electrode in a spiral with unequal pitches as described above, the helical angle should be approximately 45° below the condensing tube. There is a need,
When the helical angle is increased in this manner, the density of the electrode relative to the condensation area becomes small, making it impossible to remove condensation sufficiently. In addition, when the amount of condensate increases, the velocity of the condensate flowing along the electrode increases and it scatters outward, causing the effluent to adhere to other adjacent condensate tubes and reducing the overall heat transfer coefficient. I had the inconvenience of having to do this.

An object of the present invention is to obtain a condensation transfer promoting device that can increase the density of electrodes relative to the condensation area and can also smoothly discharge condensate.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above-mentioned object, the condensing heat transfer promoting device according to the present invention is provided with a condensing tube arranged on the outer periphery of a substantially vertical condensing tube so as to be inclined at a constant angle with respect to its axis. In this system, ring-shaped electrodes are arranged in multiple stages, and a condensation discharge part that protrudes outward and utilizes capillary phenomenon is provided at the lowest position in the axial direction of each of these electrodes.

The condensate discharge part allows the condensate to flow out smoothly from the electrode by, for example, capillary action, and is further provided with a condensate lead-out main path on which the tip of the condensate discharge part is suspended.

(Function) In the above configuration, when a high voltage is applied between the condensation tube 1 and the electrode 2 during gas condensation, the condensate that condenses on the surface of the condensation tube is transferred to the electrode by electrohydrodynamic action. The liquid is attracted to flow between the electrodes, passes through the slanted ring-shaped electrode, and flows to the condensate discharge section located at the lowest position in the axial direction. Therefore, the condensate flows from the condensate discharge part to the condensate outlet main path and naturally flows downward.

(Embodiment) Figures 1 and 2 show an embodiment of the present invention, in which a ring is attached to the outer periphery of the condensing pipe 1, through which a refrigerant flows, so as to be inclined at a constant angle with respect to its axis. The shaped electrodes 2 are attached to support rods 4 which are spaced apart from the condensation tube 1 by spacers 3 while facing the condensation tube 1, and are arranged in multiple stages. As shown in FIG. 2, the electrode 2 is entirely oblong in the form of a strip or a line, and a condensate discharge part 5 is formed at one end in the long axis direction, and is disposed around the outer periphery of the condensation tube 1. Each part is located at an equal distance from the surface of the condensing tube 1, and the condensate discharge part 5 is located at the lowest position in the axial direction.

As shown in FIG. 2, the condensate discharge part 5 is constructed by discontinuously discontinuing the ring-shaped electrode 2 and extending straight parts 6 whose ends are parallel to each other to protrude outward. The opening part 7 is formed by bending the opening part 7.

Therefore, a condensate discharge main path 8 having a U-shaped cross section is provided parallel to the condensation tube 1 at a position connecting the tips of the condensate discharge portions 5 of each electrode 2 disposed on the outer periphery of the condensation tube 1. The tip of each condensate discharge part 5 is suspended inside the condensate discharge main path 8.

In the above configuration, when a high voltage is applied between the condensing tube 1 and the electrode 2 during gas condensation, the condensate 9 condensed on the surface of the condensing tube 1 is electrohydrodynamically generated as shown in FIG. The liquid is attracted to the electrode 2 by the mechanical action, flows across the electrode 2, and flows through the ring-shaped electrode 2 to the condensate discharge part 5 located at the lowest position in the axial direction. However, in the condensate discharge part 5 of the lever, the condensate 9 passes through the gap in the straight line part 6 formed in parallel, and further moves from the open part 7 at the tip to the condensate discharge main path 8, and naturally flows downward. Become.

By forming the straight line part 6 parallel to the condensate discharge part 5 and allowing the condensate 9 to flow through the gap, a large amount of condensate drawn to the electrode 2 flows through the gap by capillary action. It is highly convenient because it flows smoothly and statically.

In addition, by providing a condensate discharge part for each electrode as described above, it is possible to reduce the spacing between the electrodes, and as a result, the condensate can be smoothly discharged and the surface of the condenser tube can be removed. The formed liquid film becomes thinner, and the condensation heat transfer coefficient can be improved.

FIGS. 4 and 5 show another embodiment, which differs from the configuration described above in that the condensate discharge section is constructed of a core-shaped body 10. That is, in this embodiment, the condensate discharge part 11 is constructed by attaching a core body 10 formed by bundling wire mesh or other fibers to the lowermost position in the axial direction of the electrode 2. At this time, the electrode 2 to which the core body 10 is attached
It is desirable to wrap a wire mesh 12 or the like around the corresponding part.

According to this configuration, the condensate can flow smoothly and statically from the core body 10 to the condensate lead-out trunk path 8 by utilizing the capillary phenomenon caused by the core body 1010.

In the above description, the condensate outlet main path 8 is exemplified as having a U-shaped cross section, but is not limited to this, and may of course be cylindrical or rod-shaped.

〔Effect of the invention〕

As described above, in the condensing heat transfer promoting device according to the present invention, ring-shaped electrodes are disposed in multiple stages around the outer periphery of the almost vertical condensing tube so as to be inclined at a constant angle with respect to the axis of the condensing tube. Since a condensate discharge part utilizing capillary phenomenon that protrudes outward is provided at the lowest position in the axial direction of each of these electrodes, it is possible to arrange ring-shaped electrodes in a high density around the condensation tube, and to prevent condensation. The condensate generated on the condensation surface of the tube is absorbed by an electrohydrodynamic suction effect due to the voltage applied to the ring electrodes, a liquid flowing down effect due to gravity due to the inclination of each ring electrode, and the bottom of each ring electrode. Due to the synergistic effect with the capillary action of the condensate discharge part protruding to the outside provided at the lower position, the condensate generated on the condensation surface of the condensation tube is actively sucked and pulled off from the condensation surface, and each The condensate is guided statically along the inclination of the ring-shaped electrode, allowing the condensate to flow down smoothly due to the capillary action of the condensate discharge part, and the condensate does not scatter to the electrode below or be guided and have an adverse effect. The removal of condensed liquid from the surface becomes smooth and smooth, and the liquid film formed on the surface of the condensing tube becomes thinner, so that high condensing heat transfer efficiency can be ensured at all times.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of a condensation heat transfer promoting device according to an embodiment of the present invention, FIG. 2 is a perspective view showing electrodes, FIG. 3 is an explanatory view showing how condensate flows, and FIG. 4 is a side view showing another embodiment of the present invention,
FIG. 5 is a perspective view of the electrode shown in FIG. 4. 1... Condensing tube, 2... Electrode, 3... Spacer,
4... Support rod, 5... Condensate discharge part, 6... Straight part, 7... Open part, 8... Condensate lead-out main path, 10
...core body.

Claims (1)

[Claims] 1. Ring-shaped electrodes facing each other at a constant angle with respect to the axis are arranged in multiple stages on the outer periphery of a substantially vertical condensation pipe, and are located at the lowest position in the axial direction of each of these electrodes. 1. A condensation heat transfer promoting device, comprising: a condensate discharge section protruding outward that utilizes capillary phenomenon. 2. The condensation heat transfer promoting device according to claim 1, wherein the condensate discharge section is constructed by discontinuing the electrodes and forming a gap between both ends of the electrodes. 3. The condensate discharge part is configured by extending parallel straight parts extending outward from both ends of the electrode, and forming a gap between the straight parts. Condensation heat transfer accelerator. 4. The condensation heat transfer promoting device according to claim 1, wherein the condensate discharge part is constituted by a core body attached to the electrode so as to protrude outward. 5. The condensation heat transfer promoting device according to claim 2, comprising a condensate lead-out main path in which the tip of the condensate discharge part of each electrode is suspended.