JP2000055508A - Liquid distributor, bent plate used for the same and heat exchanger using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid distributor which can be simply worked with a simple structure and suck liquid from a part near its surface, a bending plate used for it and a heat exchanger using it. SOLUTION: A liquid distributor comprises a trough 1 for retaining liquid and at least one clip shaped bent plate 3 inserted into the side wall 2 of the trough. The bent plate 3 is provided with wedge shaped thin spaces 6 with side end parts opened outward through which liquid flows from the inner part of the side wall to the outer part thereof between the side wall 2 of the trough and the bending plate it is inserted into the trough 1. The clip shaped bent plate 3 is provided with the wedge shaped thin spaces 6 in which the liquid flows at both side end parts. Further, liquid reservoirs 7 with their ends narrowed are provided in parts for dropping the liquid outside the side wall of the trough. The liquid reservoirs 7 may be provided with slits 8. The clip shaped bending plate is fixed to the trough by brazing or welding or protrusions 9 are provided on the trough at prescribed intervals and a square hole is provided on the central part of the bent plate 3 so that the bending plate can be fixed to the trough by engaging both the members each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a liquid distributor.
In particular, the present invention relates to a liquid distributor for dropping and distributing liquid to a heat transfer tube or the like of a heat exchanger used in an absorption refrigerator, a bent plate used for the liquid distributor, and a heat exchanger using the same.

[0002]

2. Description of the Related Art For example, in an evaporator of an absorption refrigerator or the like, in a large machine, a refrigerant is sprinkled using a spray nozzle to a group of pipes. It is not realistic considering the amount of power required, the power required, and the size of the machine. Therefore, it is necessary to devise a method of efficiently applying a small amount of liquid to the pipe. As a method for this, a variety of methods have already been devised in which a gutter is laid around the top of a pipe, and a liquid is dropped on the pipe from a side surface of the gutter or a hole at the bottom.

[0003] Of these methods, a method of dripping using a surface tension and a siphon, in which a bent plate is inserted into a gutter side surface and a siphon tube is formed and dripped using a gap between the gutter side surface and the bent plate, is not rare. . However, in these methods, since the liquid is sucked up from the bottom of the gutter, it is difficult to drop octyl alcohol or the like floating on the liquid surface, and there is a possibility that clogging of dust or the like may occur. In order to solve these problems, various proposals have been made, such as forming a slit on the suction side of the siphon. However, all of them have complicated structures, are cumbersome to process, and have many difficulties.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, has a simple structure, can be easily processed, and has a liquid distributor capable of sucking up near the liquid surface and a bent plate used therefor. And a heat exchanger using the same.

[0005]

In order to solve the above-mentioned problems, the present invention has a gutter for holding a liquid, and the liquid is inserted between the gutter and a side wall of the gutter. A liquid having a structure in which at least one clip-like bending plate having a wedge-shaped narrow space whose side end flowing from the inside to the outside opens outward is inserted into the side wall of the gutter. It is a distributor. In the liquid distributor, the clip-like bent plate has a narrow wedge-shaped space at both ends at which the liquid flows, and a liquid pool portion having a narrowed tip at a portion where the liquid outside the side wall of the gutter is dropped. Is provided, and the liquid reservoir can have a slit. In addition, the clip-like bent plate is fixed to the gutter using brazing or welding, or a protrusion is provided at regular intervals in the gutter, and a square hole is provided in the center of the bent plate, and both are engaged with each other. Can be fixed.

According to the present invention, a wedge-shaped narrow space through which a liquid flows is provided between a side wall of the gutter and a side wall of the gutter. It is a clip-like bent plate provided with. Further, in the present invention, the liquid distributor is used for a liquid film type heat exchanger, and the liquid distributor is provided above a heat transfer portion of the heat exchanger. In the heat exchanger, a liquid film type heat exchanger is a heat transfer device used for an evaporator, an absorber or a regenerator constituting an absorption refrigerator, and a fluid on a liquid film side is a working fluid of a cycle. It can be a refrigerant liquid or solution.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The liquid distributor of the present invention is constructed by inserting a clip-like bent plate into a gutter, transporting the liquid using the surface tension and the principle of siphon, and It has a wedge-shaped shape that opens to the outside, and both ends (both sides) of the bent plate serve as flow paths, and a liquid pool (a portion shaped like a pen tip). It is good to have. This liquid distributor uses a surface tension and a siphon principle to transfer a refrigerant liquid to a heat transfer tube or a heat transfer plate surface (hereinafter referred to as a heat transfer tube) of a shell-and-tube heat exchanger of an absorption refrigerator. Alternatively, a solution (hereinafter, referred to as a solution) can be suitably used as a solution that is dropped and distributed. In the specific example of the present invention, a wedge-shaped space opened to the outside, which is formed on both sides of the bending plate, is used like a siphon tube, so that the refrigerant can be sucked up from near the surface. Such a shape is not known so far as a liquid distributor. Probably because of the concept of forming a siphon tube, the idea that the siphon principle would not work if it was opened to the outside worked, and it did not lead to the idea of this shape.

However, in experiments conducted by the present inventors, the fact that the side surface is open does not hinder the principle of the siphon. This is because the water surface of the open portion becomes a side surface due to surface tension and forms a water channel. This is the most characteristic point of the present invention.
The angle of opening depends on the physical properties of the liquid (surface tension, wettability, viscous force, etc.). Qualitatively, the smaller the angle, the easier the liquid is to suck up, and the larger, the easier the liquid to flow. Since both are in a trade-off relationship, it cannot be said unconditionally, but 2 ° to 15 °
The degree is appropriate. In the experiment, 6 °, 8 °, 10 °
I went down the street, but 10 ° was the best,
° was the easiest to siphon. 8 ° was the easiest to flow without sinking.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall side sectional view of a liquid distributor installed on a heat transfer tube. FIG. 2 (a) is a front view of a bent plate portion of the liquid distributor of FIG. 1, and FIG. An AA sectional view, and (c) shows a BB sectional view of (a). In the figure, 1 is a gutter, 2
Is the side wall of the gutter, 3 is a clip-like bent plate, 4 is a heat transfer tube, 5
Denotes a coolant, 6 denotes a wedge portion of a bent plate, 7 denotes a liquid pool portion, 8 denotes a slit portion, 9 denotes a fixing protrusion, and 10 denotes a hole.

As shown in FIGS. 1 and 2, the liquid distributor according to the present invention has a gutter 1 for holding and distributing a liquid, and a clip-shaped bending plate 3 (hereinafter referred to as a “bend”) inserted into the gutter 1. , A bent plate), the liquid 5 is sucked up (by the surface tension and the siphon principle) through the space of the wedge 6 formed by the side surface 2 of the gutter and the bent plate 3, and the heat transfer tube 4 is formed.
Etc. are dropped. Unlike the conventional one, not only the liquid 5 but also a capacity-enhancing agent (octyl alcohol) floating on the liquid surface can be dropped at the same time, and the suction of dust and the like is reduced. In this liquid distributor, the wedge portion 6 of the bent plate is open at an angle of 8 ° on one side.

According to the present invention, since the bending plate 3 is independent, positioning is necessary when fixing to the gutter 1. However, since the bent plate 3 has elasticity, a claw 9 is provided on the gutter 1 as shown in FIGS. 1 and 2, a female hole 10 where the claw 9 is caught is opened in the bent plate 3, and it is engaged and fixed. Easy installation and easy positioning. Also suitable for mass production. FIG. 3 is a development view of the bent plate. As described above, the liquid distributor of the present invention can be easily obtained by bending a single plate. FIG. 4 shows another shape of the liquid distributor of the present invention, wherein (a) is a front view and (b) is AA of (a).
It is sectional drawing. Thus, the upper wedge portion of the bending plate can be inflated. With such a structure, processing cannot be performed by simple bending, but since the flow path has a straight shape, the refrigerant and the like can easily pass through.

The liquid distributor of the present invention can be used for an evaporator and a regenerator of an absorption refrigerator, particularly a small absorption chiller / heater, and can also be used for an absorber if it is water-cooled. For example, an absorption refrigerator generally uses water as a refrigerant, applies water to a pipe through which a liquid to be cooled (evaporation pipe) is applied, evaporates the water, and cools the liquid by the heat of vaporization. A liquid distributor can be applied to the water applied to this evaporator tube. Further, the liquid distributor of the present invention is not limited to the absorption type, and can be used in other refrigerators. Further, other than the refrigerator, the liquid distributor can be appropriately used for a technique of continuously dropping liquid. In the embodiment, a plate heat exchanger using a heat transfer tube may be used.

[0013]

According to the present invention, the following effects can be obtained. 1) Since the liquid is sucked up also from the vicinity of the liquid surface, a capacity enhancer and the like can be dropped at the same time. 2) Since the liquid is also sucked up from near the liquid surface, it is difficult to suck up dust and the like deposited on the bottom. 3) Since the openings are provided on both sides, dust and the like are hardly clogged. 4) Since there is no need to be continuous even if many are attached, materials can be saved. 5) Since the shape is simple, manufacturing is easy. 6) Since the shape is simple, variations and defects are small. 7) Since the shape is simple, it is inexpensive. 8) Since it is a single thin plate, it is elastic and easy to fix.

[Brief description of the drawings]

FIG. 1 is an overall side sectional view of a liquid distributor according to the present invention.

2 (a) is a front view, FIG. 2 (b) is a sectional view taken along line AA of FIG. 1, and FIG.
-B sectional drawing.

FIG. 3 is a development view of a bent plate of the liquid distributor of FIG.

4A is a front view of a bent plate portion of another liquid distributor of the present invention, and FIG. 4B is a cross-sectional view taken along line AA of FIG.

[Explanation of symbols]

1: gutter, 2: side wall, 3: bent plate, 4: heat transfer tube, 5: liquid,
6: wedge portion, 7: liquid pool portion, 8: slit, 9: protrusion, 10: hole,

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kikuichi Mori, Inventor 11-1 Haneda Asahimachi, Ota-ku, Tokyo Ebara Corporation (72) Inventor Noriyuki Sugiyama 11-1, Haneda Asahi-cho, Ota-ku, Tokyo Ebara Corporation (72) Inventor Tomoyuki Uchimura 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation

Claims (8)

[Claims] 1. A wedge having a gutter for holding a liquid and having a side end open outward between a side wall of the gutter and a side wall of the gutter when the gutter is inserted into the gutter. A liquid distributor, wherein at least one clip-like bent plate having a mold narrow space is inserted into a side wall of the gutter. 2. The liquid distributor according to claim 1, wherein the clip-like bending plate has wedge-shaped narrow spaces at both end portions through which liquid flows. 3. The liquid distribution according to claim 1, wherein the clip-like bent plate is provided with a liquid pool portion having a narrowed end at a portion where the liquid outside the side wall of the gutter is dropped. vessel. 4. The liquid distributor according to claim 3, wherein the liquid reservoir has a slit. 5. The clip-like bending plate is fixed to the gutter using brazing or welding, or a projection is provided on the gutter at regular intervals, and a square hole is provided in the center of the bending plate. 5. The fixing method according to claim 1, wherein
The liquid distributor according to any one of the preceding claims. 6. A clip having a wedge-shaped narrow space through which a liquid flows and whose side end is opened outwardly between a side wall of a gutter and a side wall of the gutter holding the liquid of the liquid distributor. Like bent plate. 7. The liquid distributor according to claim 1, wherein the liquid distributor is used for a liquid film type heat exchanger, and the liquid distributor is arranged above a heat transfer section of the heat exchanger. A heat exchanger. 8. The liquid film type heat exchanger is a heat transfer device used for an evaporator, an absorber or a regenerator constituting an absorption refrigerator, and the fluid on the liquid film side is a working fluid of a cycle. The heat exchanger according to claim 7, wherein: