JPH0481109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a heat exchanger with plate-like fins used for example in refrigerators, air conditioners, etc.

BACKGROUND TECHNOLOGY This type of heat exchanger with plate-like fins has a plurality of plate-like fin groups arranged at a predetermined pitch inserted at predetermined intervals into one or more refrigerant pipes, and then the refrigerant Place the tube between the fins at the U
If multiple refrigerant pipes are used, their ends are connected to each other via a U-bent pipe to form a series of meandering refrigerant circuits. (For example, JP-A-54-151549, JP-A-53-106957).

As a type of heat exchanger with plate-shaped fins, due to design requirements, as shown in Fig. 5,
An odd number of refrigerant pipes 31, 31, 31, such as 3 or 5, are inserted into each fin group 30 in parallel, and the fin groups 30 are also an odd number. It may be configured in stages or in an odd number of stages such as seven stages. However, in the case of such an odd number row and odd number stage configuration, when a series of refrigerant circuits are constructed by connecting the ends of adjacent refrigerant pipes with the U vent pipes 32, the refrigerant inlet 33 and the refrigerant outlet 34 at both ends exchange heat. As a result, they are placed in opposite directions on both the left and right sides of the vessel core.

Problem to be Solved by the Invention For this reason, space for piping to be connected to the refrigerant inlet and outlet is required on both sides of the heat exchanger core, and for example, when assembled into a refrigerator, a large amount of piping space is required. Not only that, but the piping work is more complicated than when it is done only on one side of the core, reducing assembly work efficiency, and furthermore, the required piping materials increase, which is a factor in increasing costs. There was a problem.

The purpose of this invention is to solve the above-mentioned problems, namely, in a heat exchanger with plate-like fins of odd number rows and stages, the refrigerant outlet pipes are placed on the same side of the core as in the case of even stages. The purpose is to make it possible to position it facing the same direction.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a system in which three or more odd number refrigerant pipes are inserted and fixed in parallel through an odd number of plate-like fin groups, and are arranged in a U-shape between adjacent fin groups. In a plate-shaped finned heat exchanger that is bent and formed into a meandering shape and in which adjacent ends of refrigerant pipes are connected to each other via a U-bent pipe, one of the odd number of refrigerant pipes is the most By cutting off the U-shaped curved pipe section that spans between the upper or lowermost fin group and the fin group from the fin group to the second fin group, the refrigerant pipe end is connected to the second fin group. A plate-like finned heat exchanger characterized in that one end is opened and an inlet pipe or an outlet pipe is attached, so that the inlet pipe and the outlet pipe at both ends of the refrigerant circuit are provided on the same side of the heat exchanger core. The gist is the vessel.

Embodiments Hereinafter, the structure of the present invention will be further explained based on illustrated embodiments.

A heat exchanger according to an embodiment of the present invention shown in FIG. 1 was manufactured as follows. That is, as shown in FIG. 2, first, three straight refrigerant pipes 1 are inserted through an odd number of plate-like fin groups 2 arranged at predetermined intervals, expanded, and fixed. Thereafter, the refrigerant pipes 1, 1, 1 are sequentially bent into a U-shape at the portion between adjacent fin groups 2, 2 to form a meandering shape. The above process is exactly the same as the conventional manufacturing process, but in manufacturing the heat exchanger of the present invention, the bending process may be performed after or before bending as shown in FIG. 3. 1 straddling between the fin group 2-A located at the topmost stage and the fin group 2-B located at the second stage from the fin group.
Two U-shaped bent pipe parts 3 are cut and removed at the boundary with the straight pipe part 4, and one end of the refrigerant pipe 1 is opened at one end of the second stage fin group 2-B. do. Then, a refrigerant inlet pipe 6 is attached to this open end 5, and required pipe ends of adjacent refrigerant pipes 1, 1 are connected to each other via a U vent pipe 7, thereby forming a series of refrigerant circuits. A refrigerant outlet pipe 8 is attached to the end of the other refrigerant pipe 1 that opens at one end of the lowermost fin group 2, thereby completing the required heat exchanger core.

Therefore, in the heat exchanger according to the present invention manufactured as described above, as shown in FIGS. 1 and 4, the refrigerant inlet pipe 6 and the outlet pipe 8 are both located on the same side of the heat exchange core ( The straight pipe section 4, which is a part of one refrigerant pipe 1 that penetrates the uppermost fin group 2-A, communicates with the refrigerant circuit. It remains as a dead pipe with both ends open.

In the above embodiment, the refrigerant inlet pipe 6 is attached to one end of the fin group 2-B from the top fin group 2-A to the second fin group 2-B. One refrigerant pipe 1 at one end of the group
The tube end of the tube may be opened, and a refrigerant outlet tube may be connected to this.

Effects of the Invention The present invention provides a heat exchanger with plate-like fins of odd rows and odd stages in which an odd number of refrigerant pipes are inserted through a group of fins and bent in a serpentine shape to form an odd number of stages of fins. Although it is a heat exchanger, the refrigerant inlet pipe and the outlet pipe at both ends of the series of refrigerant circuits formed by communicating refrigerant pipes are located on the same side of the heat exchanger core. The piping space can be concentrated on only one side of the heat exchanger, which can eliminate the drawback of occupying a large piping space on both sides, and the required piping length can also be reduced, and the piping connection work can be made easier. cost·
It is possible to improve the installation work efficiency.

In addition, this invention provides a method for refrigerant pipes in one of the odd number of refrigerant pipes.
By cutting off the U-shaped bent pipe section that spans between the top or bottom fin group and the second fin group, the end of the refrigerant pipe is connected to the second fin group. The fins are opened at one end, and an inlet pipe or an outlet pipe is attached to the open end. Therefore, a dead pipe portion that does not constitute a refrigerant circuit remains at one end of the uppermost or lowermost fin group, and the existence of this dead pipe portion supplements the strength of the fin group and prevents unnecessary deformation. is prevented. In addition, even during the process of expanding the refrigerant pipes and fixing the fins during heat exchanger manufacturing, the work can be performed with the refrigerant pipes passed through all fin groups evenly, which prevents accidental deformation of the fins. , can prevent damage,
The pipe expansion work process can be carried out easily.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a heat exchanger with plate-like fins showing an embodiment of the present invention, and Fig. 2 shows how a group of fins are attached to a refrigerant pipe when manufacturing the heat exchanger of Fig. 1. FIG. 3 is a perspective view showing the heat exchanger of FIG. 1 in a state in the process of being manufactured, and FIG. 4 is a right side view of the heat exchanger of FIG. 1. FIG. 5 is a perspective view of a conventional product corresponding to FIG. 1. 1... Refrigerant pipe, 2... Plate fin group, 2-A...
... Fin group at the top, 2-B... Fin group at the second stage from the top, 3... Bent pipe section to be removed, 4...
Straight pipe section, 5... Open end of refrigerant pipe, 6... Refrigerant inlet, 7... U vent pipe, 8... Refrigerant outlet.

Claims (1)

[Scope of Claims] 1. Three or more odd number refrigerant pipes are inserted and fixed in parallel through an odd number of plate-like fin groups, and are bent in a U-shape between adjacent fin groups to form a meandering shape. , in a heat exchanger with plate-shaped fins in which adjacent refrigerant pipe ends are connected to each other via a U-bent pipe, one of the odd number of refrigerant pipes has a group of fins at the top or bottom stage; By cutting off the U-shaped curved pipe section extending between the fin group and the second stage fin group, the end of the refrigerant pipe is opened at one end of the second stage fin group and becomes an inlet pipe or an outlet pipe. 1. A heat exchanger with plate-shaped fins, wherein the inlet pipe and the outlet pipe at both ends of the refrigerant circuit are provided on the same side of the heat exchanger core.