JPS62206384A - Heat exchanger - 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] [Field of Industrial Application] The present invention relates to a heat exchanger, and relates to a structure for preventing frost clogging in a cross-eye 7-tube heat exchanger that combines fins and pipes. It is.

[Conventional technology]

A conventional heat exchanger with a cross-fin tube type heat exchanger with cut-and-raised parts on the fins 52: The exchanger is manufactured by Japanese Patent Application Laid-Open No. 57-37696.
It is constructed as described in No. This will be explained with reference to FIGS. 3 to 5. Figure 3 is.

FIG. 2 is a perspective view showing the external performance of the heat exchanger. 1 is fin.

2 is a pipe. The vertical Ifr plane of the heat exchanger is
As shown in the figure. 45 + A tri is a sectional view taken along line B-t3 in FIG. 4. As can be seen from these figures, the fin 10 has i-numbered incisions 3 to 6 formed by raising the incisions.
T-provided. This cut and raised portion is located approximately at the center of the 3 to 6 F1% fins 1 and 1.

F indicates 'A flow.

[Problem that the invention seeks to solve]

In the above-mentioned prior art, the height of the cut-and-raised part 3 is formed at a height located in the middle of the path between the fins 1, so that the distance between the fin 1 and the fin 1 adjacent to this fin 1 is The width is about half that of the case without incisions. For this reason, when frost forms on the fins 1, they tend to become clogged with frost, making it difficult for air to flow. As a result, there was a problem in that the amount of heat transfer was significantly reduced.

An object of the present invention is to provide a heat exchanger that does not cause a sudden drop in heat transfer performance due to blockage A even if frost occurs.

[Means for resolving the labor issue]

The above object is to provide a cross-fin tube type heat exchanger comprising fJ fins having a plurality of cut and raised fins formed in the direction of air flow, and a plurality of pipes that are combined with the fins side by side. On the air inlet side of the fin, the cut and raised portion is at a height that is off the center of the spacing between the fins, and on the air 4 output low of the fin, the height is higher than the center on the air inlet side. It is achieved by being close to the master.

[Effect]

The height of the nine cut-outs formed on the air inlet side of the fins of the heat exchanger is off the center of the spacing between the fins, so the distance between the fins and the A11ed cut-outs is A large portion can be formed. In the part with this large interval, even if frost occurs on the air inlet side of the fin, the interval is large, making it difficult for frost to form. Since the height is closer to the center of the spacing between the fins than the side height, 55 of the heat is exchanged with the airflow in the portion where the airflow flowing between the fins is fast. From the above.

The above-mentioned heat exchange does not cause a sudden drop in heat transfer performance.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 and 2. FIG. 41 is a side view of the row pipe heat exchanger A. FIG. 2 is a sectional view taken along the line A-AO in FIG. l is a fin, with multiple pipes 2.

The fin surface is divided into aa stages. Further, the fin 1 is provided with cut-and-raised portions 3 to 6, and the cut-and-raised rope length a of the cut-and-raised portion 3 is the u4 of the fin 1 adjacent to the fin IK.
The height is one-half of 4c. 1! In this example, one-fifth of the above-mentioned distance -〇 was selected from the viewpoint of both prevention of clogging and heat transfer performance.
It was set to Further, the cut and raise height b of the cut and raise 6 is higher than the cut and raise height a of the cut and raise 3, and is set at the center of the interval C. Furthermore, the vertical length hIIfi of the cut-and-raised part 3 with respect to the airflow direction F, and the vertical thickness h of the cut-and-raised part 6
It is shorter than l.

According to this, even if frost forms on the air inlet side of the fin 1, the cut and raised height a of the air inlet side cut and raised part 3 is low, that is, the distance between S) fin/l and the fin 1 is 14C. Because it is off center, there is a large gap between the fin/l and the cut and raised part 3, and because the vertical length hl is short,
The black part of the cut-and-raised part 3 increases between the fins 1 and the fin 1, and the distance C between the fins 1 and 1 in this part does not become small. It is difficult to cause sudden clogging. In addition, the cut height b of the cut and raised cut 6 provided on the air outlet side is higher than the cut and raised rope length a of the cut and raised 3, that is, it is close to the center of the interval. , it is possible to maintain high heat transfer performance by exchanging heat in the portion where the airflow F is fast, and to make the fin 10 landing distribution p4-.

[Young fruit of invention]

According to the present invention, while maintaining heat transfer performance, a rapid drop in heat transfer performance due to clogging can be prevented by defrosting the air while maintaining the heat transfer performance. Driving time up to 1-view can be maintained.

[Brief explanation of drawings]

m4L! ! J is the fin shape diagram of the heat exchanger of the present invention, the second
The figure is a lyrm diagram of the 5TiI1 diagram, and Figure 43 is an external diagram of the heat exchanger of the present invention, m4L! ! J is a fin shape diagram of a conventional heat exchanger, and FIG. 5 is a sectional view of the GT diagram. 1...Fin, 2...Pipe, 3-6...Cut, F...Direction of airflow, a...Cut height of cut and raise 3, b...Cut Height of raised 6, C... Distance between fin 1 and fin l, hl... Vertical length of raised 3 (m)
``2...Vertical length of cut and raised 6.

Claims (1)

[Claims] 1. A cross-finch tube-type heat exchanger comprising a plurality of fins having a plurality of cut and raised portions formed between an air inlet side and an air outlet side, and a plurality of pipes combined to intersect with the fins. A raised cut is formed at a height that is off the center of the spacing between the fins on the air inlet side, and is formed at a height closer to the center than the height on the air inlet side on the air outlet side. A heat exchanger comprising: