JPS60111859A - Heat transfer pipe for absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to absorption chiller-heating machines, absorption heat pumps, etc. (droplet type or spray type swallow generators, absorbers, light pumps, and other heat exchangers for firearms). This relates to heat exchanger tubes.

In general, in evaporators, absorbers, and generators such as absorption chiller-heating machines and absorption heat pumps that use droplet-dropping or spray-type absorption heat pumps that have heat transfer tubes placed next to them, liquid is dispersed in the heat transfer tubes and then dripped or sprayed. However, it is essential to uniformly form a liquid film on the heat exchanger tubes in order to maintain the heat transfer performance of these heat exchangers.

Conventionally, in order to disperse this liquid uniformly, various improvements have been made to the droplet dropping device (I-ray), for example, to form a uniform liquid film on the upper part of the tube group of heat transfer tubes. ing.

However, as the refrigerant moves toward the bottom, the droplet flow rate decreases due to evaporation, and furthermore, due to the influence of the physical properties of the liquid or the dropping speed, the liquid is not sufficiently dispersed in the tube axis direction, resulting in liquid distribution. (Third point)
(See the non-patterned area in the figure).

Therefore, if the distribution of the liquid is insufficient, there will be dry areas (where the liquid does not touch) on the heat exchanger tube, and the heat transfer properties of the heat exchanger tube will decrease.
8 has the disadvantage of decreasing.

The present invention has been made in view of the above-mentioned circumstances, and provides a heat exchanger tube whose purpose is to prevent the liquid from being unevenly distributed, distribute the liquid almost uniformly from the upper stage to the lower stage of the heat exchanger tube, and form a liquid film uniformly. It is.

That is, in the present invention, the shape of the heat tube itself is triangular.

A polygonal shape with an odd number of angles such as a pentagon or a heptagon, and the surface of the package is processed with a loaf-in process or other special process, and the 11 tubes are installed so that one side of the polygon is positioned on the top surface. What's wrong? By arranging an appropriate number of heat transfer tubes below the droplet dripping device in this way, the droplet spreads in the axial direction on one side of the two surfaces of the tube more than in a conventional circular tube. It has the effect of easily forming a uniform liquid film on the heat transfer tube. Also, because the polygon of the heat transfer tube has an odd number of angles, if the - side is placed on the top side, one corner (apex) will always be located directly below the tube. (a) It is something that brings to fruition.

The present invention will be explained below based on the drawings of the embodiments (:
The 11th order is as follows.

Figures 1 and 2 show the heat exchanger tubes having a pentagonal shape of 4fa. 1 is a heat exchanger tube body having a pentagonal tube shape, and fin portions 2 formed by loaf-in processing on the surface of the heat exchanger tube body 1 are arranged over the entire area to form a polygonal heat exchanger tube 3.

To explain the function of heat exchanger tubes, first, when used as heat exchanger tubes in an absorption refrigerator, an appropriate number of heat exchanger tubes 3 are arranged in multiple stages at regular intervals as shown in FIG. Immediately above there are pipes 4 for 9 liquids to the absorber, evaporator and generator (not shown) and 1- for liquid droplet dispersion.
This is where the relay 5 is installed. In this case, the heat exchanger tubes 3 at each stage have one side that is the flat part 3a as the upper surface, and the peak part 3 that forms one corner.
flat part 3a of the heat exchanger tube 3 in the uppermost position, with b as the lower surface
A small hole 6 for dispersing liquid droplets provided in the dispersing tray 5 is facing directly in the middle. That is, in the 3 groups of multi-stage heat exchanger tubes, the flat part 3a, which is one side of the lower stage, is arranged directly below the peak part 3b, which is one corner of the polygon. If is completed.

Here, the absorption liquid or refrigerant liquid a dripping from the droplet dispersion small holes 6 of the 1-ray 5, which is the droplet dropping device, is
The liquid drops onto the flat+n portion 3a of the heat exchanger tube 3, but since the dropping surface of the droplet is flat, the liquid spreads much more in the tube axis direction than in conventional round heat exchanger tubes. The heat exchanger tubes 3 are not evenly wetted. In other words, in a tube group in which heat transfer tubes 3 are arranged in multiple stages, since the spread of the liquid in the tube axis direction is small in the conventional round heat transfer tubes 3', this is combined with a decrease in the dropping rate due to the physical properties of the liquid or evaporation. As a result, the intervals between drops are small, and the distribution of the liquid in the tube axis direction is not uniform, resulting in parts of the heat transfer tube where the liquid does not touch, resulting in a deterioration of heat transfer performance (see the non-patterned area in Figure 3). . However, the reason why such a uniform liquid film cannot be measured is that the I of the droplet falls in the droplet stream m.
Due to the physical force, the liquid drops directly above the next stage pipe as shown in Fig. 4 (4y phenomenon)].

In this respect, the heat exchanger tube 3 of the present invention has the effect of spreading the liquid in the tube axis direction like the previous one, and the dropping interval l1Ii
Even if lρ becomes large, it becomes possible to wet the tube evenly and thinly due to the size of its spread (see the pattern in Figure 2).

Also, it has a polygonal tube shape with its apex 3b pointing downward! Ii
! The fact that the direction of the inertial force of the droplet is closer to the vertical direction than the horizontal direction of the tube is that the dispersion of the droplet (the flying of the droplet) It also serves as a way to make the defeated cow become an adult.

As mentioned above, the heat exchanger tube for an absorption refrigerator of the present invention has the outer surface of the tube subjected to a loaf-in process or other special process.
By configuring the tube white body to be a polygon with odd angles in ξ, the dripping state of the refrigerant and absorption liquid is improved by 1q compared to a round heat transfer tube. . Therefore, the heat transfer performance of the evaporator and the absorption performance and heat transfer performance of the absorber are improved, thereby achieving the effect of making the device more compact and reducing the cost of the device accordingly.

[Brief explanation of drawings]

The drawings do not show the embodiments of the present invention, and FIG.
2 is a side view of the conventional type in use, FIG. 3 is a side view of the conventional circular tube in use, and FIG. 4 is an explanatory view of the same circular tube in a dripping state. DESCRIPTION OF SYMBOLS 1... Heat exchanger tube main body, 2... Fin part, 3... Heat exchanger tube, 3a... Flat part, 3b... Apex part. Patent Applicant: Kobe Steel, Ltd., Sanyo Electric Co., Ltd. Tokyo Sanyo Electric Co., Ltd. Agent: Omata Yuki K, 1

Claims (1)

[Claims] 1. Dropping or scattering an absorption liquid or refrigerant outside the heat transfer tube to form a liquid film of the absorption liquid or refrigerant on the outside surface of the tube,
Absorption refrigeration, in which heat transfers through the liquid film 2. Heat transfer for an absorption refrigerator according to claim 1, wherein the polygon of the heat transfer tube is an odd polygon such as a triangle, a pentagon, or a heptagon. color·.