JPS63197886A - Finned heat exchanger - Google Patents

Abstract

PURPOSE:To make a substantial narrow fin width without changing a bending pitch of a coolant pipe and to improve thermal conductivity by a method wherein two sets of heat exchangers to be used in an air conditioner or a refrigerator and the like are combined to each other. CONSTITUTION:The main body A of a heat exchanger is comprised of two sets of heat exchangers B and C. Each of the heat exchangers has a fin width (d) of about 1/2 of a conventional fin width and it is composed of several small piece fins 3 and 3' cut at a pitch (e) in a direction of air flow and coolant pipes 4 and 4' passing at a right angle with the small piece fins 3 and 3'. The coolant pipe 4 is passed at a lower position than a central part of the fins 3 and in turn the coolant pipe 4' is passed at a higher position than the central position of the fins 3'. The main body A of the heat exchanger is inserted and set such that a heat exchanger C is installed in a pitch (e) of a heat exchanger B, and both heat exchangers are connected with a U-shaped coolant pipe 5. In this way, since the heat exchanger is divided into several units with a fin width (d) of about 1/2 of a conventional fin width, a temperature interface layer becomes thin and a high thermal conductivity can be attained.

Description

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

BACKGROUND OF THE INVENTION In recent years, it has been desired to significantly reduce the power consumption of refrigerators and the like that use heat exchangers, and heat exchangers have also been required to have improved heat transfer performance.

The conventional heat exchanger as described above will be explained below with reference to the drawings. FIG. 5 shows a side view of the conventional heat exchanger, and FIG. 6 shows a perspective view of the conventional heat exchanger. be.

In FIGS. 5 and 6, 1 is a small piece fin having a fin width, which is divided in the direction of wind flow to form a predetermined inter-row pitch a. Reference numeral 2 denotes a refrigerant pipe that passes through the small piece fin 1 orthogonally. The refrigerant pipe 2 is bent in a meandering manner with a bending pitch C.

The operation of the heat exchanger configured as above will be described below.

First, an air flow flows between the small piece fins 1 in the F direction, and a heat medium flows inside the refrigerant pipe 2. Heat exchange occurs between the air flow and the heat medium through the small fins 1 and the refrigerant pipes 2. At this time, since the small piece fins 1 are divided into many pieces with a predetermined inter-row pitch a, the temperature boundary layer can be made thinner, and the heat transfer coefficient can be improved due to the leading edge effect of the boundary layer. For example, "Frozen J VOI; 60, yff
i688 31 Hage).

Problems to be Solved by the Invention However, in the above configuration, the fin width of the small piece fins 1 in the airflow direction is determined by the bending pitch C of the refrigerant pipes 2. Therefore, it is not possible to further narrow the fin width of the small piece fin 1 with the aim of further improving the heat transfer coefficient, so there is a problem in that it is not possible to obtain a significant improvement in the heat transfer coefficient. Ta.

In view of the above problems, the present invention provides a bending pitch C of the refrigerant pipe 2.
The present invention provides a heat exchanger with fins that can significantly improve the heat transfer coefficient by greatly narrowing the fin width without changing the In order to solve this problem, the heat exchanger with fins of the present invention is equipped with a small piece fin and a refrigerant pipe passing through the small piece fin, and the refrigerant pipe is bent at a pitch that is more than twice the fin width of the small piece fin in the airflow direction. Two finned heat exchangers formed by bending in a serpentine shape are inserted between the respective row pitches to form a single heat exchanger.

Effects The present invention can reduce the fin width of the small piece fin in the airflow direction to about % of the conventional one without changing the pipe diameter and bending pitch of the conventional refrigerant pipe, so that the temperature generated on the small piece fin surface can be reduced. The boundary layer can be made thinner, and the heat transfer coefficient can be greatly improved due to the leading edge effect of the boundary layer.

EXAMPLE Hereinafter, a finned heat exchanger according to an example of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of a finned heat exchanger according to an embodiment of the present invention, Fig. 2 is a side view of Fig. 1, and Fig. 3 is a heat exchanger before configuring heat exchanger A of Fig. 2. In Figure 1, A is the main body of the heat exchanger and two sets of heat exchangers B are shown.
, and a heat exchanger C.

Reference numeral 3 denotes a small piece fin having a fin width d about % of that of a conventional fin, which is divided in the direction of wind flow to form an inter-row pitch e. Reference numeral 4 denotes a refrigerant pipe that passes orthogonally through a position below the center of the small piece fin 3. By bending the refrigerant pipe 4 in a meandering manner at a bending pitch f, the heat exchanger B is constructed as shown in Fig. 3. Note that the bending pitch f is set to be at least twice the fin width d. C is a heat exchanger composed of small piece fins 3' and refrigerant pipes 4' having the same dimensions as heat exchanger B. The configuration is the same as that of heat exchanger B, so a description thereof will be omitted.

By inserting and installing heat exchanger C between the row pitch e of heat exchanger B and connecting heat exchanger B and heat exchanger C with U-shaped refrigerant pipes 6, the row pitch q is achieved. A heat exchanger main body A includes a large number of small fins 3, 3' having a fin width d.

The operation of the heat exchanger configured as above will be described below.

First, air flows in the direction F between the small fins 3 and 3', and a heat medium flows within the refrigerant pipes 4 and 4'. Heat exchange occurs between the air flow and the heat medium through the small fins 3, 3' and the refrigerant pipes 4, 4'. At that time, small piece fee 73,3
' is divided into multiple parts with a fin width d that constitutes a predetermined inter-row pitch q and is about % of the conventional fin width, so that the temperature boundary layer can be made thinner. As a result, as shown in the characteristic diagram of fin width and heat transfer coefficient shown in FIG. 4, the fin width changes from b to d, making it possible to obtain a higher heat transfer coefficient than before due to the boundary layer leading edge effect.

As described above, according to this embodiment, two finned heat exchangers are formed by bending the refrigerant pipes in a meandering manner at a bending pitch that is more than twice the fin width d of the small piece fins 3 in the airflow direction. By inserting between each row pitch,
The small piece fin can have a narrower fin width than the conventional one, and the heat transfer coefficient can be improved due to the boundary layer leading edge effect. Effects of the Invention As described above, the present invention provides a small piece fin and a small piece fin that penetrates the small piece fin. Two finned heat exchangers are formed by bending the refrigerant pipes in a serpentine shape at a bending pitch that is more than twice the line width of the small fins in the airflow direction. By inserting and installing a large number of small piece fins between rows, the fins of the small piece fins can be inserted and installed to form a predetermined pitch between rows. Since the width can be reduced to approximately % of the conventional width, the heat transfer coefficient can be greatly improved due to the leading edge effect of the boundary layer.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heat exchanger showing an embodiment of the present invention, FIG. 2 is a side view of the heat exchanger, and FIG. 3 is a side view of only the heat exchanger section B of the heat exchanger. FIG. 4 is a characteristic diagram of fin width and heat transfer coefficient, FIG. 6 is a side view of a conventional heat exchanger, and FIG. 6 is a perspective view of a conventional heat exchanger. 3... Small piece fin, 4... Refrigerant pipe, d
...Fin width, e...Pitch between rows, q
・・・・・・Pitch between rows. Name of agent: Patent attorney Toshio Nakao and one other person A-
--Attraction School Ban Sankyu ε-8 -C Fig. 1 ε-,, B 4-, c...Fin width 7F, 3 Fig. 73 = Year-/1. -L-, I Fig. 4; tt) Fin width L (rngL) Fig. 5 Mi L4

Claims (1)

[Claims] A heat sink with two fins, comprising a small piece fin and a refrigerant pipe passing through the small piece fin, and formed by bending the refrigerant pipe in a serpentine shape at a bending pitch that is more than twice the fin width of the small piece fin in the airflow direction. 1. A heat exchanger with fins, characterized in that the exchanger is inserted and installed between respective row pitches, and is provided with a large number of small piece fins forming a predetermined row pitch.