JPH0612392Y2 - Liquid withdrawal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] (Industrial field of application) The present invention is designed to electrically remove a condensate film formed on the outer circumference of a condenser pipe used in, for example, a cooler, to condense heat. The present invention relates to a liquid withdrawal device that improves transmission.

(Prior Art) In order to promote energy saving, it is important to effectively use low temperature waste heat. At present, low-temperature waste heat of 100 ° C. or less is hardly recovered, and considering that nearly 60% of the heat quantity discharged from the factory is low-temperature waste heat of 100 ° C. or less, energy recovery from low-temperature waste heat is not possible. It is indispensable for labor saving of fossil fuels such as oil.

In the case of recovering low-temperature waste heat energy, one of effective means is to perform power generation using a low boiling point medium such as CFC as a refrigerant.

However, since the heat source is at a low temperature, the power generation efficiency is extremely low compared to thermal power generation, and the temperature difference between the heat source and cooling water is not so high. The heat transfer area must be several hundred times the capacity.

Therefore, in a power plant using low temperature waste heat, the manufacturing cost of the heat exchanger is extremely high, which is an obstacle to practical use.

Recently, as one means for dramatically improving the heat exchange amount of a heat exchanger, for example, JP-B-59-41117, JP-A-59-180298, and JP-A-59-134495.
As seen in Japanese Patent Publication, a high voltage is applied to the heat transfer tube to forcibly remove the condensed liquid film adhering to the heat transfer tube due to the potential difference,
So-called liquid withdrawal devices have been proposed which enhance condensation heat transfer. According to these techniques, it has been confirmed that the heat exchange amount of the conventional heat exchanger is more than doubled.

(Problems to be solved by the device) However, although these technologies are excellent in terms of performance improvement, they are divided into several sets of concentric and spirally formed electrode wires in one heat transfer tube. Since it is surrounded and the end of the spirally arranged electrode wire is in an expanded state with an extremely large radius, it takes a long time to manufacture and assemble, and the manufacturing cost of the conventional heat exchanger. It is a big increase. In addition, since the electrode wire is surrounded by several sets in one heat transfer tube, a stable arrangement of the electrode wire cannot be obtained. Therefore, a high voltage flows in the local part of the heat transfer tube, which causes dielectric breakdown. There is a risk of triggering.

In view of the above, the present invention has an object to provide a liquid drawing device that further improves the condensation heat transfer by stabilizing the arrangement of the electrode wires with respect to the heat transfer tube. .

[Constitution of device]

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a main electrode facing the outer surface of the tube at a constant interval and parallel to the tube axial direction. A plurality of branching electrodes divided in a dendritic manner are provided so that the free end side has a gradual upward slope, and the outer surfaces of the tube are concentrically surrounded by these branching electrodes, and the main electrode is divided into a plurality of branching electrodes. Below the branch,
The main electrode is provided with a liquid collecting portion having a pocket portion, and the condensed liquid from the outer surface of the tube attracted to the dividing electrodes is collected along the dividing electrodes from the pocket portion to the liquid collecting portion by the action of gravity. The overflow liquid from the liquid collecting portion is made to flow down along the outer surface of the main electrode.

(Function) The electrode has a so-called tree shape consisting of a trunk and branches, and since the branches are concentrically surrounded by the heat transfer tube, the positional relationship between the electrode and the heat transfer tube is always constant. A stable and stable arrangement is obtained. Further, since the electrodes and the heat transfer tubes have a one-to-one relationship, the number of assembling steps and the like are drastically reduced as compared with the conventional case where the electrodes are divided into several sets and attached.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a heat exchanger applied to this type of field, in which a shell 1 has a pair of headers 2 and 2 incorporated therein, which are communicated via a heat transfer tube 4. Then, while the condensing fluid, such as CFC, flows from the header inlet 5 to the header outlet 3 via the heat transfer tube 4, the condensed fluid, such as water, flowing from the shell inlet 6 to the shell outlet 7 exchanges heat. When this heat is transferred, the heat transfer tube 4 is coated with a condensate liquid film, so the heat exchange amount does not improve as expected, and research and development have been conducted day and night.

Therefore, the present invention is one in which the condensate film generated in the heat transfer tube is positively removed by skillfully utilizing the potential difference. That is, the electrode according to the present invention is formed in a tree shape as shown in FIG. 2, and comprises a main electrode 11 corresponding to a trunk portion and a branch electrode 12 corresponding to a branch. Also,
The main electrode 11 is provided with a liquid collecting portion 13 below each branched portion that is divided into a plurality of branch electrodes 12, and the liquid collecting portion 13 has, for example, a U-shaped notch shown in FIG. Configured. The liquid collecting portion 13 is provided with a pocket portion 14 for receiving the condensed liquid dropped along the distribution electrode 12, and the condensed liquid collected in the liquid collecting portion 13 guided by the pocket portion 14 is the liquid collecting portion 13. It is guided to the outside of the main electrode 11 through an opening 13 and flows down the outside of the main electrode 11.

In the electrode having the above structure, the main electrodes 11 are arranged in parallel in the axial direction of the heat transfer tube 4 so as to face the outer surface of the heat transfer tube 4 at a constant distance, as shown in FIGS. 3 and 4. The distribution electrode 12 is concentrically surrounded by the upper right direction or the upper left direction with respect to the axial direction of the heat transfer tube 4. That is, the plurality of distribution electrodes 12 are provided in the shape of a cantilever so as to have a gradual upward slope from the main electrode 11 toward the free end side.

Now, in removing the condensate that coats the heat transfer tube 4, a high voltage is applied between the main electrode 11 and the heat transfer tube 12. Then, the condensate generated on the outer surface of the heat transfer tube 4 is
Due to the potential difference, the condensed liquid is attracted to the side of the distribution electrode 12, and the condensate thus drawn is guided by the pocket portion 14 by the action of gravity and collected in the liquid collecting portion 13 by the action of gravity.
The condensate collected in this way is once stored in the liquid collecting section 13, and then only the overflow flows through the outer surface of the main electrode 11 and flows downward.

[Effect of device]

As described above, according to the present invention, an electrode is formed in a tree-like shape including a main electrode and a split electrode, and the split electrode is arranged so that the free end side has a gradual upward slope, and Since the heat transfer tubes and the electrodes are concentrically surrounded by each other, a stable positional relationship between the heat transfer tubes and the electrodes is maintained, and a better condensation performance can be obtained. Further, the condensate generated on the outer surface of the heat transfer tube is attracted to the split electrode side due to the potential difference,
The attracted condensate is collected by the action of gravity along the descending gradient electrode through the pocket portion to the liquid collecting portion. The overflow of the condensate collected in the liquid collecting part is made to flow down along the outer surface of the main electrode, preventing the falling liquid from scattering to the heat transfer tube side, so the heat transfer performance of the heat transfer tube Can be fully maintained and is not damaged. Further, it suffices to dispose one electrode in one heat transfer tube, and it is not necessary to dispose a plurality of electrodes. Therefore, there are effects such as a drastic reduction in manufacturing cost and assembly man-hours.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an example of a heat exchanger applied to a liquid drawing apparatus of the present invention, and FIG. 2 shows shapes of electrodes used in the liquid drawing apparatus of the present invention. FIG. 3 is a schematic view showing an assembled state of a heat transfer tube and an electrode used in the liquid drawing apparatus of the present invention, and FIG. 4 is a sectional view taken along line IV-IV of FIG. 4 ... Heat transfer tube, 11 ... Main electrode, 12 ... Minute electrode, 13
...... Liquid collecting part, 14 ...... Pocket part.

 ─────────────────────────────────────────────────── --Continued from the front page Examiner Shigeru Kumagai (56) References JP-A-61-295495 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A main electrode is provided parallel to the outer surface of the tube at a constant interval in parallel with the tube axis direction, and a plurality of branch electrodes branched in a dendritic manner from the main electrode gradually have an upward slope on the free end side. And the outer surface of the tube is concentrically surrounded by these split electrodes, and a pocket portion is provided in the main electrode below each branch portion that divides the main electrode into a plurality of split electrodes. And a condensate from the outer surface of the tube attracted to the distribution electrodes is collected along the distribution electrodes from the pockets to the liquid collection part by the action of gravity. A liquid drawing device characterized in that the liquid flows down along the outer surface of the main electrode.