JPS63108195A - Cross fin tube type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a water drip from being dispersed at a downstream end of fin by a method wherein arcular ribs are arranged near a pipe collar on surfaces of fin, a water dispersion between the pipes in an arrangement of a base is improved and an draft resistance is reduced when dewing occurs. CONSTITUTION:Arcular ribs 5 round pipe collars 4 may suck water drips generated on the surfaces of fins 1 to cause the water drips to be larger one and positively drop them from the central part between the pipes. Cut and raised portions 3 of the fin surfaces are preferably made such that they are overlapped to each other to form a mountainlike shape. Condensed water generated on the fin surfaces is collected at the central part between the pipes by ribs 5 to become a larger water drip and then positively discharged there. Therefore, the central part between the pipes has water drip continuously. As a result, water drips may hardly accumulate at the downstream sides of the air flow 6 and a dispersion of water drips can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchanger for air conditioning, and more particularly to a cross-fin tube heat exchanger having a base arrangement of pipes.

[Conventional technology]

In the conventional device, the pipe row pitch L is set from 1.2 times the pipe diameter d to 1
．． It was set at a range of 4 times. That is, 1.2d(L(1
, 4d0 The reason is that the range in which condensed water can easily flow between the pipes and the heat transfer performance is high has been experimentally determined.

[Problem that the invention seeks to solve]

The above conventional technology does not actively collect condensed water on the fin surface between the pipes and actively discharge the condensed water, resulting in high ventilation resistance during dew exposure and There was a problem in that water droplets were likely to scatter from the downstream end.

The purpose of this invention is. Improving drainage between pipes in a Go board arrangement
Second, the purpose is to reduce aeration resistance during exposure and prevent water droplets from scattering from the downstream end of the fin.

[Means for solving problems]

The above object is achieved by providing an arc-shaped rib near the pipe collar on the fin surface.

[Effect]

That is, the arcuate ribs around the pipe collar act to draw in water droplets generated on the fin surface, turn them into large water droplets, and actively cause them to fall from the center between the pipes. Therefore, the water droplets on the fin surface are collected at the center between the pipes, and the center between the pipes is like a river in which water droplets are constantly flowing down. In this way, by one circular arc rib. The draining performance of the cross-fin tube heat exchanger in a grid arrangement is improved, and as a result, it is possible to reduce the ventilation resistance at the time of swelling and prevent water droplets from scattering from the downstream end of the fins.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 shows a heat exchanger according to the present invention cut along a plane parallel to the fins. Pipe 2 is a base arrangement, showing a two-row layout. It is desirable that the cut and raised portions 3 on the fin surface have a shape with good drainage properties, such as the shape disclosed in Japanese Patent Laid-Open No. 61-6588, for example, a shape in which the cut and raised portions 3 are arranged in a plurality of chevrons. Condensed water is generated on the fin surface.

The ribs 5 collect water in the center between the pipes, and the water is actively discharged as large droplets. Therefore, water droplets are constantly flowing in the center between the pipes, like a river. As a result, water droplets are less likely to accumulate at the downstream end of the fins of the air flow 6, and the scattering of water droplets can be minimized.

2 to 5 show examples of cross-sectional shapes of single-arc ribs, in which the ribs in FIG. 2 are recessed when viewed from the front, and in FIG. 3 they are protruding. Figures 4 and 5 are a combination of Figures 2 and 3, and water droplets 7 fall in the direction of the arrow.

FIG. 7 shows another shape of the arcuate ribs, in which two arcuate ribs are connected at the center between the pipes.

When there are two rows of pipes, the pipe row pitch Lt.

If the fin depth is reduced by more than 1/2, the area where water droplets are collected will be expanded, which will be more effective in preventing water droplets from scattering.

〔Effect of the invention〕

As described above, according to the present invention, water droplets on the fin surface can be drawn between the pipes and discharged, thereby reducing ventilation resistance during dew exposure and significantly preventing water droplets from scattering from the downstream end of the fin. effective.

[Brief explanation of the drawing]

Figure '11X1 is a sectional view parallel to the fin of an embodiment of the present invention, Figures 2 to 5 are examples of rib shapes shown in the A-A cross section of Figure 1, and Figure 6 is a schematic diagram showing the behavior of water liquid. figure. FIG. 7 is a sectional view parallel to the fins of another embodiment. 1...fin, 2...pipe, 3...cut and raised part, 4...pipe collar, 5...rib, 6...water flow, 7...water drop.

Claims (2)

[Claims] 1. A cross-fin type heat exchanger consisting of a group of tubes arranged in a Go board arrangement and a group of flat plate fins perpendicular to the cross-fin type heat exchanger, characterized in that an arcuate rib is provided near the pipe collar on the flat plate fin surface. exchanger. 2. In a cross-finch tube heat exchanger with two rows of pipes arranged in a Go board, the pipe row pitch L is 1 of the fin depth D.
2. The cross-finch tube heat exchanger according to claim 1, wherein the cross-finch tube heat exchanger is larger than /2.