JPH0330718Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a finch tube heat exchanger used in air conditioners, freezers, refrigerators, and the like.

Configuration of conventional example and its problems The conventional Finch-Ube heat exchanger has two
As shown in the figure, it is composed of a large number of flat plate-shaped fins 1, 2, and 5 arranged in parallel, and a refrigerant pipe 3 that passes through these fins, and is designed to improve heat exchange efficiency. , for each row of refrigerant pipes 3,
The fins were divided into fins 1 and 2 or 5 in order to improve the heat transfer coefficient due to the leading edge effect of the boundary layer.

However, if such a heat exchanger is used as an evaporator and is accompanied by frost formation, frost will gradually start from the fin row 4 formed by the fins 5 on the windward side of the airflow, and eventually the fin row 4 on the windward side will become frosted. The space between the 5 fins becomes clogged with frost. For this reason, the fin row 4 on the windward side has a larger fin pitch than the fin row 4 on the leeward side, and consideration is given to frosting the entire heat exchanger as uniformly as possible. In this case, the fin pitch had to be made considerably large, and the number of fins was small, the heat transfer surface area was small, and the cooling capacity was correspondingly small.

Purpose of the invention Therefore, the present invention eliminates the need to increase the fin pitch of the fin rows on the windward side even when there is frost, and can be expected to improve performance by increasing the number of fins. The purpose of the present invention is to obtain a heat exchanger that can secure air volume and maintain cooling performance even when airflow occurs.

Structure of the invention In order to achieve this purpose, the present invention secures a large heat transfer area by bending both or one end of the upper and lower ends of the fins in the fin row on the windward side with respect to the airflow. In addition, even if the windward fin row becomes clogged with frost, a ventilation path to the leeward fin row is secured, air volume is secured, and cooling capacity can be maintained during frost formation. The fin pitch does not need to be as large as in the past, and the heat transfer area can be increased to improve performance.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Figs. 3 to 5, reference numeral 11 is a finch-tube heat exchanger used as an evaporator in refrigerators, etc., and has a large number of plate-shaped fins 12a, 12b, 12c, and 12d arranged in parallel, and fins perpendicular to these. The refrigerant pipe 13 is inserted into the refrigerant pipe 13.
The fins 12a forming the fin row 14 on the windward side of the airflow, that is, on the windward side in the airflow direction shown by arrow B, are bent at both upper and lower ends at substantially right angles to form bent pieces 15. The bent pieces 15 are disposed on the same plane in the fin row 14. For this reason, ventilation passages 16 are formed above and below the fin rows 14. In addition, the heat transfer area is large by the amount of the bent piece 15 and can be used effectively.

In the above configuration, if frost builds up and progresses, the fin row 14 on the windward side will first become clogged with frost, but the ventilation passages 16 are secured above and below the fins 12a, and the fins Column 14
Bypassing the air flow, the overall air volume is ensured and cooling performance can be maintained. And fin row 14
Since the fin pitch is no longer affected by frost clogging, the fin pitch can be reduced and the number of fins can be increased, which also increases the heat transfer surface area and improves performance. Furthermore, the upper and lower ends of the fins 12b on the leeward side of the fins 12a are exposed to the air flow due to the presence of the bent piece 15, and the upper and lower ends of the fins 12b are directly exposed to ventilation air, so that a large boundary layer is exposed. A fringe effect can be obtained.

Effects of the invention As is clear from the above explanation, the present invention is a finch tube heat exchanger in which both or one end of the upper and lower ends of one or more rows of fins on the windward side of the airflow are bent. Therefore, even if the fin row on the windward side becomes clogged with frost during frost formation, the amount of ventilation can be ensured and the refrigerant performance can be maintained. This has the effect of increasing the number of fins by reducing the fin pitch of the rows, increasing the heat transfer surface area, and improving performance.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional Finch-Ube heat exchanger, Fig. 2 is a side view of the same heat exchanger, Fig. 3 is a perspective view of a heat exchanger according to an embodiment of the present invention, and Fig. 4 is a perspective view of the heat exchanger of the present invention. FIG. 3 is a sectional view taken along line A-A, and FIG. 5 is a front view of the heat exchanger. 12a, 12b, 12c, 12d...fin,
13... Refrigerant pipe, 15... Bend piece.

Claims (1)

[Scope of utility model registration request] It consists of a large number of plate fins arranged in parallel and a refrigerant pipe passing through the plate fins. A heat exchanger with both or one end bent at the top and bottom.