JPS608696A - Heat exchanger - Google Patents

Abstract

PURPOSE:To shorten the needed length of a refrigerant tube, by enabling bend parts of a tube also to exchange heat, by providing plate fins which are continuous toward the flowing direction of the air, to the bend parts of a refrigerant tube. CONSTITUTION:A certain number of plate fins 3a and 3b which are continuous toward the flowing direction of the air are provided to the bend parts 4b of a refrigerant tube 4, and end plates 5 are provided at both ends of the fins 3a and 3b, at the ends of bend parts 4b, located within the width of tube diameter. Heat can be exchanged also in the bend parts 4b, by providing plate fins 3a and 3b which are not divided by the bend parts 4b of a refrigerant tube. As a result, the needed length of a refrigerant tube can be shortened, large heat transfer surface can be taken, and the heat exchanging rate can be increased, that is, the heat exchanging capacity can be increased. In addition, assembling ability of a heat exchanger can be increased, because temporary assembly can be performed by the presence of plate fins 3a and 3b, when the end plates 5 are installed to the fins.

Description

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

Structure of the conventional example and its problems As shown in Figs. 1 and 2, the conventional fin tube type heat exchanger has a large number of flat plate-shaped fins a and b arranged in parallel, and these fins. a.

It consists of a refrigerant pipe C penetrating through the refrigerant pipe C, and an end plate d installed at both ends of the fin.
The aim was to improve the heat transfer coefficient through the leading edge effect of the boundary layer.

However, since the refrigerant pipe bent part e is located outside the end play (d), there is a problem that the refrigerant pipe bent part e does not contribute to heat exchange. Also.

In order to insert the refrigerant pipe bent part e into the end plate d, a large gap is created in the elongated hole f, and the ventilation air of the heat exchanger bypasses to the outside of the end plate d through the elongated hole f. However, the problem was that the air volume had to be increased to compensate for the bypass.

OBJECT OF THE INVENTION Therefore, the present invention solves the above-mentioned problems and
The purpose of this project is to increase the heat exchange amount of the double-type heat exchanger, that is, to improve the capacity and reduce the required refrigerant pipe length, and to reduce the required air volume required for heat exchange and reduce the power consumption of the blower. do.

Structure of the Invention In order to achieve this object, the present invention provides an end plate that is installed at the tip of the bent portion of the refrigerant pipe in the middle of the refrigerant pipe diameter, and an appropriate number of plates that are continuous in the direction of air flow. Install the fin at the bent part of the refrigerant pipe.

By preventing air from bypassing through the long holes provided in the end plate, and by providing plate fins at the bent portions, the required refrigerant pipe length is reduced.
By increasing the heat transfer area, it is possible to increase the amount of heat exchange, that is, to improve the capacity, and to reduce the amount of air required for heat exchange, thereby reducing the power consumption of the blower.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Figures 3 to 5, 1 is a fin-tube heat exchanger used as an evaporator in refrigerators, etc., and is bent into a meandering shape to consist of a straight pipe section 4a and a U-shaped bent section 4b. refrigerant pipe 4, and a large number of plate-shaped small pieces arranged in close contact with the straight pipe portion 4a of the refrigerant pipe 4 and divided in the direction of the refrigerant pipe 40 rows with respect to the air flow direction (arrow A). fins 2a, 2b, and an appropriate number of plays that are provided at the bent portion 4b of the refrigerant pipe 4 and are continuous in the air flow direction)
It consists of fins 73a and 3b, and end plays 1 and 6 installed at both ends of the fins 3a and sb so as to be located within the pipe diameter 1 at the tips of the bent portions 4b. A defrosting heater 6 is provided in a meandering manner so as to exchange heat between the small fins 2a and 2b and the plate fins 73a and 3b, and is fixed to the end plate 5 by caulking. That is, a large number of small piece fins 2a, 2
A large number of refrigerant pipes b are arranged at predetermined intervals and at intervals of the bent portions of the refrigerant pipes 4, and the straight refrigerant pipes 4 are inserted into the pipe insertion holes of the small piece fins 2a and 2b to form the refrigerant pipes 4. Expand the refrigerant pipe 4 and the fins 2a and 2b, and
Then bend the bent part into a serpentine shape. And undivided plate fins 3a, 3b l-J,)(i'
A long hole 7 of a predetermined length is formed so as to be located at each bent portion 4b.
a, 7b are bored, and this plate fin 3a,
3b are sequentially inserted and joined to the bent portion 4b. Further, an elongated hole 8 is bored in the end plate 5 so as to be located at the middle of the tube diameter of the bent portion 4b, and the end plate 5 is installed in the bent portion 4b. In other words, fin 3a.

3b and a long hole 7a provided in the end plate 5.

7b and 8 gradually become smaller along the bent portion 4b,
Furthermore, the elongated hole 8 of the end plate 5 is completely covered by the bent portion 4b.

In the above configuration, by installing the undivided plate fins 3a and 3b in the bent portion 4b of the refrigerant pipe, heat exchange can be performed even in the bent portion 4b, so the required refrigerant pipe length can be reduced, and the heat transfer area can be increased. It is possible to increase the amount of heat exchange, that is, to improve the capacity. Further, the presence of the plate fins 3a and 3b allows temporary assembly when installing the end plate 5, and improves assembly efficiency. Furthermore, by completely blocking the elongated holes 8 of the end plate 5 with the refrigerant pipe bent portions 4b, it is possible to prevent ventilation air from the heat exchanger from bypassing to the outside of the end plate 5 through the elongated holes 8. It is possible to reduce the amount of air required for heat exchange and reduce the power consumption of the blower.

Effects of the Invention As is clear from the above explanation, the present invention allows heat exchange even in the bent portion by installing plate fins that are continuous in the direction of air flow at the bent portion of the refrigerant pipe. Therefore, the required length of the refrigerant pipe can be reduced, and the heat transfer area can be increased, thereby increasing the amount of heat exchange, that is, improving the capacity. Furthermore, the presence of the plate fins allows for temporary assembly when installing the end plate, resulting in improved assembly efficiency. Furthermore, by installing the end plate at the tip of the bent part of the refrigerant pipe in the middle of the refrigerant pipe diameter, the elongated hole in the end plate will be completely blocked, allowing ventilation air from the heat exchanger to pass through the elongated hole to the end. Bypassing to the outside of the plate can be prevented, the amount of air required for heat exchange can be reduced, and the power consumption of the blower can be reduced.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventional fin tube type heat exchanger.
FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, FIG. 3 is a plan view of a heat exchanger according to an embodiment of the present invention, and FIG. 4 is a side view of fins used in the heat exchanger. FIG. 5 is a side view of the end plate used in the heat exchanger. 2a, 2b...small piece fin +3a, sb...
Plate fin, 4... Refrigerant pipe, 5... End plate, 4b... Refrigerant pipe bent portion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A refrigerant pipe bent in a serpentine shape, a large number of small plate-shaped fins provided in the straight pipe part of the refrigerant pipe and divided in the column direction of the refrigerant pipe with respect to the air flow direction, and An appropriate number of plate fins provided at the bent portion and continuous with respect to the air flow direction, and an end plate provided at the tip of the bent portion of the refrigerant tube and located at the center of the diameter of the refrigerant tube. A heat exchanger consisting of