JPS63318497A - Heat exchanger - Google Patents

Abstract

PURPOSE:To decrease draft resistance in curved parts, to utilize the heating surface of curved parts effectively, and to increase heat transfer coefficient, by determining the fin pitches of the inside rows of curved parts larger than those of the outside rows of curved parts. CONSTITUTION:In a heat exchanger 17 before curved parts are formed in a heat exchanger 11, the fin pitches fP11 of curved parts A of a group of fins being inserted into a group of heat exchanger tubes 13 which are to be the inside rows of curved parts are determined larger than the fin pitches fP12 of the other parts. Accordingly the fin pitches fP13 of the inside rows of curved parts A are larger than the fin pitches fP14 of the outside rows of curved parts A in the heat exchanger 11, and draft resistance at the time when air passes through the curved parts A is decreased. Therefore the air rate passing through the curved parts A increases, the curved parts A can be utilized effectively as heating surfaces; as a result, the heat transfer coefficient to a heat exchanger can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchanger used in air conditioning equipment and the like.

BACKGROUND OF THE INVENTION In recent years, heat exchangers have been used in a variety of fields in the air conditioning industry, etc., and in response to demands for compactness, their shapes have become various, such as those bent into L-shapes and U-shapes.

A conventional heat exchanger will be explained below.

1 shown in Figs. 3 and 4 is a conventional two-row heat exchanger;
, 3 are heat exchanger tube groups, and 4 and 6 are fin groups. 6 indicates the direction of air flow. FIG. 5 shows the heat exchanger 6 before a part of the heat exchanger 1 is bent.

The heat exchanger 5 is partially bent and then connected to the refrigerant tube groups 2 and 3.
The fin groups 4 and 6 are inserted at a fin pitch jp such that the curved part outer row heat exchanger tube group 2 is long and the curved part inner row heat exchanger tube group 3 is short so that the ends of the fins 4 and 6 are aligned.

Since the heat exchanger 1 shown in FIGS. 3 and 4 is a partially curved version of the heat exchanger 6 shown in FIG. 6, the fin pitch fP1 of the fin group 5 in the inner row of the curved portion is as follows. The fin pitch fP2 is smaller than the fin pitch fP2 of the outer row of the curved portion.

Problems to be Solved by the Invention However, in the above configuration, the fin pitch fP1 of the inner row of the curved part is equal to the fin pitch 'P1' of the other parts.
Since it becomes smaller than fP2, the ventilation resistance of the air passing through the curved part increases, and the amount of air passing through the curved part decreases.The curved part does not contribute effectively to the heel heat transfer area, and the amount of heat exchange decreases. I had the problem of doing so.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems, effectively utilize the heat transfer area of the curved portion, and improve the amount of heat exchange.

Means for Solving the Problems In order to solve the above problems, the heat exchanger of the present invention includes a plurality of rows of heat exchanger tubes through which a fluid flows, and a heat exchanger tube group inserted into the heat exchanger tubes, through which air flows. Consists of a group of flowing fins,
partially curving the heat exchanger tube group into which the fin group is inserted;
The fin pitch of the inner row of the curved portion is made larger than the fin pitch 4 of the outer row of the curved portion.

Effect In the above configuration, by making the fin pitch of the inner row of the curved portion larger than the fin pitch of the outer row of the curved portion, the ventilation resistance of the curved portion is reduced, the amount of air passing through the curved portion is increased, and the transmission of air through the curved portion is increased. Thermal area can be used effectively and the amount of heat exchange can be improved.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, 11 is a heat exchanger, 12 is a group of heat transfer tubes in the outer row of the curved portion, 13 is a group of heat transfer tubes in the inner row of the curved portion, 14 is a group of fins inserted in the heat transfer tube group 12, and 16 is a heat transfer tube group. Group 13
This is a group of fins inserted into the

Air flows between the fin groups 14 and 16 in the direction of arrow 16.

In FIG. 2, 17 is a heat exchanger before a part of the heat exchanger 11 is curved, and the heat exchanger tube group 13 is the inner row of the curved part.
The fin pitch fP1 of the curved part A of the fin group inserted into
1 is larger than the fin pitch fP12 of other parts.

Therefore, in the heat exchanger 11, the inner row fin pitch fP13 of the curved portion A is the outer row fin pitch fP of the curved portion A.
14, the ventilation resistance when air passes through the curved part A becomes smaller, the amount of air passing through the curved part A increases, the curved part A can be effectively used as a heat transfer area, and the amount of heat exchange is reduced. Improvements can be made.

Effects of the Invention As described above, the heat exchanger of the present invention consists of a plurality of rows of heat exchanger tubes through which a fluid flows, and a 747 group inserted into the heat exchanger tubes through which air flows. Since the heat exchanger tube group into which the fin group is inserted is partially curved, and the fin pitch in the inner row of the curved portion is larger than the fin pitch in the outer row of the curved portion, an increase in ventilation resistance at the curved portion can be suppressed. This allows the amount of air passing through the curved portion to be increased, making it possible to effectively utilize the curved portion as a heat transfer area, thereby improving the amount of heat exchange.

[Brief explanation of drawings]

FIG. 1 is a top view of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a top view of essential parts of the heat exchanger of the present invention before bending,
Figure 3 is a perspective view of a conventional heat exchanger, Figure 4 is a top view of the main parts of the conventional heat exchanger, and Figure 5 is a top view of the main parts of the conventional heat exchanger before bending. It is a diagram. 12.13... Heat exchanger tube group, 14.15...
...Fin group. Name of agent: Patent attorney Toshio Nakao and 1 other person12
．． 13 - &: JiW group Fig. 1 +415-Fin group lσ Fig. 2 Fig. 3 Fig. 4 Fig. 5

Claims (1)

[Claims] consisting of a plurality of rows of heat exchanger tube groups through which fluid flows, and a fin group inserted into the heat exchanger tube group through which air flows, the heat exchanger tube group into which the fin group is inserted is partially curved; A heat exchanger characterized in that the fin pitch of the inner row of the curved portions is larger than the fin pitch of the outer row of the curved portions.