JP2809845B2 - Manufacturing method of heat exchanger with plate fins - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a plate-shaped finned heat exchanger used as an evaporator for a refrigerator or a showcase for refrigerated ready-to-eat food storage.

2. Description of the Related Art Conventionally, as this type of heat exchanger, there is known a heat exchanger in which a refrigerant pipe is bent in a meandering shape, and plate-like fins are attached to a straight pipe portion thereof at predetermined intervals. In particular, in recent years, attention has been paid to a structure in which adjacent straight pipe portions are arranged in a staggered manner in the arrangement direction in order to further improve the heat exchange efficiency. As a method for manufacturing such a heat exchanger, a manufacturing method as disclosed in JP-A-59-229247 has been proposed. That is, after the plate-like fins are mounted at predetermined intervals on the straight pipe portion of the straight refrigerant pipe in a penetrating state at predetermined intervals, the refrigerant pipes are sequentially placed in the curved pipe portion at the predetermined portions.
A twist is applied to the curved pipes while bending the whole in a meandering shape by bending them into a letter shape, or a twist is applied to each curved pipe after the bending, so that the adjacent straight pipes are bent. There has been proposed a manufacturing method in which the electrodes are arranged in a staggered manner in the arrangement direction.

However, according to the manufacturing method of twisting while bending in a meandering shape, according to the manufacturing method, instead of the conventional bending device for meandering bending of the refrigerant pipe, a twisting function as well as a bending function is provided. New equipment must be introduced. On the other hand, in the case of a manufacturing method in which a twist is applied to each curved pipe portion after the meandering bending, a separate device for imparting a twist must be introduced in addition to the conventional bending device.

Moreover, in any of the above-described manufacturing methods, simply twisting the curved tube portion during the twisting process also causes the plate-like fin group mounted on each straight tube portion to be inclined in the twisting direction. A device having a function of intensively applying a twist only to the curved pipe portion is required, and as a result, there is a problem that the manufacturing cost is high.

Means for Solving the Problems The present invention has been made in view of the above-described problems, and has a structure in which a refrigerant pipe is bent in a meandering shape and each straight pipe portion is arranged in a direction in which they are arranged. An object of the present invention is to provide a manufacturing method capable of easily obtaining heat exchangers with plate-like fins arranged in a staggered manner without using a special twisting device.

Thus, the method for manufacturing a heat exchanger according to the present invention is characterized in that, after the plate-shaped fin is attached to the straight refrigerant pipe, the bent portion of the pipe is stepped, and then the conventional meandering is performed. That is, according to the present invention, the refrigerant pipe is bent in a meandering shape, and plate-like fins are attached to each straight pipe portion at predetermined intervals so as to penetrate, and In the above-mentioned method for manufacturing a heat exchanger with plate-like fins in which the respective straight pipe portions are arranged in a staggered manner in the direction in which they are arranged, the plate-like fins may be arranged in a straight refrigerant pipe so as to avoid the curved pipe portion. Was mounted in a penetrating state at predetermined intervals, and then each of the curved pipe sections was stepped so that the respective straight pipe sections of the refrigerant pipe were staggered in the longitudinal direction. Then, the curved pipe portion to which the step processing is applied is connected to straight pipes on both sides thereof. Characterized by the bent into a U-shape so that the proposed site are parallel with each other, it is an gist a method for manufacturing a heat exchanger with plate fins.

Embodiments Hereinafter, the present invention will be described based on illustrated embodiments.

As shown in FIG. 3, the heat exchanger (A) obtained by the manufacturing method according to this embodiment includes a pair of refrigerant pipes (1) bent in a meandering shape and respective straight pipe portions (1a). And a plurality of plate-like fins (2) arranged in a penetrating state at predetermined intervals, and the straight pipe portions (1a) are arranged in a staggered manner in the direction in which they are arranged. Things.

 Hereinafter, the manufacturing method will be described.

First, in the same manner as in the conventional manufacturing method, as shown in FIG. 1, a pair of straight refrigerant pipes (1) (1a '), which are arranged in parallel at a predetermined distance from each other, have a straight pipe portion (1a'). That is, by mounting rectangular plate-like fins (2) at predetermined intervals at positions avoiding the curved tube portion (1b '), a plurality of fins are attached to the refrigerant pipe (1). An assembly (B) in which the groups (3) are spaced apart from each other by a predetermined distance, and the adjacent members are arranged in a staggered manner in the direction in which they are arranged.
Create

In order to manufacture such an assembly (B), as shown in FIG. 5, a pair of refrigerant pipe insertion holes (2a) are formed as plate-like fins (2) at one end in the longitudinal direction so as to be unevenly distributed. The fins (2) are arranged in a vertically inverted state for each fin group (3) such that the insertion holes (2a) are aligned on a straight line. Then, the refrigerant pipe (1) is inserted into the insertion hole (2a) of each fin (2) in such a state of being arranged, and then the refrigerant pipe (1) is subjected to an expansion process to thereby form the refrigerant pipe. This is performed by fixing the fin (2) to (1). In addition, instead of the plate-like fin (2) in which the refrigerant pipe insertion holes (2a) and (2a) are drilled as in the upper case,
As shown in FIG. 6, a plate-like fin (12) having a coolant pipe fitting groove (12a) (12a) extending from one side edge in the axial direction to the center is used, and this is used as a coolant pipe (1). You may make it fit in (1). Thus, the plate-like fins (2) (12)
As the coolant pipe insertion hole (2a) or the same fitting groove (12a)
The heat pipes are arranged in a staggered arrangement in the direction in which the straight pipe sections (1a) of the refrigerant pipes (1) to which they are attached are arranged in a staggered manner as described later. The thickness of the exchanger can be reduced.

Next, to the assembly (B) obtained as described above,
As shown in FIG. 2, stepping is performed on the curved pipe portion (1b ') of the refrigerant pipe (1) so that the dark edges in the longitudinal direction of the respective fin groups (3) are aligned straight. In the assembly (B ') thus stepped, the fins (2) are arranged in a straight line and the refrigerant pipe to which each fin group (3) belongs. In (1), the respective straight pipe portions (1a ') are arranged in a staggered manner in the longitudinal direction.

Then, the meandering bending process is performed on the assembly (B ') on which such step processing has been performed in the same manner as in the conventional manufacturing method. That is, as shown by a dashed line in FIG. 2, first, the fin group (3) between the two fins (3) and (3) is arranged in parallel with the adjacent fin group (3). Of the refrigerant pipe (1) is bent into a U-shape. Further, the two fin groups (3) and (3) arranged in parallel in this way are arranged in a fin group (3) adjacent thereto.
Planned tube section (1b ') so that it is arranged in parallel
Is bent in a U-shape in the reverse direction. Similarly, bending is sequentially performed, and the entire assembly (B ') is bent in a meandering shape. Thus, the heat exchanger (A) as shown in FIG. 3 is completed.

The heat exchanger (A) thus obtained is particularly suitable for the fourth heat exchanger.
As shown in the figure, the straight pipe portions (1a) adjacent to the refrigerant pipe (1) are arranged in a staggered arrangement with respect to their arrangement direction. Accordingly, the area of direct contact between the air flowing in the direction indicated by the arrow in the drawing and each straight pipe portion (1a) of the refrigerant pipe (1) is increased, and the heat exchange efficiency is improved.

In the above embodiment, the two refrigerant pipes (1)
Although (1) is arranged in parallel and bent in a meandering shape, it is needless to say that it may be composed of only one refrigerant pipe. Further, in order to reduce the thickness of the heat exchanger (A), the fins (2) and (12) are provided with the refrigerant pipe insertion holes (2a) or the fitting grooves (12a) at one end side as in the above-described embodiment. Each fin (2) (12) is used in a state where the straight pipes (1a) are arranged in a zigzag pattern
Are desirably set to be at the same height position, but without using such fins (2) and (12), the adjacent fin groups (3) and the straight pipe section of the refrigerant pipe (1) As in (1a), they may be arranged in a staggered manner in their arrangement direction.

Effect of the Invention As described above, prior to bending a straight tubular refrigerant pipe in a meandering shape, the curved pipe sections are arranged such that the respective straight pipe sections of the refrigerant pipe are arranged in a staggered manner in the length direction. Since the stepping process is performed on the planned portion, it is sufficient to add a simple device for performing the stepping process as described above in addition to the conventional meandering bending device. Therefore, instead of a device having only a meandering bending function as in the conventional manufacturing method of twisting the bent tube portion while bending the refrigerant tube in a meandering shape,
It is necessary to newly introduce a device having a twisting function in addition to the bending function, or, as in the case of a manufacturing method in which a twist is applied after the meandering bending, in addition to the conventional meandering bending device, a separate twisting device is provided. There is no inconvenience of having to introduce a device for the above. Moreover, as described above, it is sufficient to simply perform the stepping process prior to the meandering bending, so that it is disposed and fixed to the straight pipe portion during the twisting process as in the case of the conventional manufacturing method of giving a twist to the curved pipe portion. The inconvenience of requiring a special device having a function of intensively applying the twist only to the curved pipe portion in order to avoid the tilted plate-like fin group in the twist direction can be solved. Therefore, according to the manufacturing method of the present invention, the desired heat exchanger with plate-shaped fins can be easily and inexpensively manufactured by simply adding a simple stepping processing device to the conventional meandering bending device. can do.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view showing a state in which plate-like fins are mounted on a straight refrigerant pipe, and FIG. 3 is an overall perspective view of the heat exchanger in a completed state, FIG. 4 is a sectional view taken along line IV-IV of FIG. 3,
FIG. 5 is a front view of the plate fin, and FIG. 6 is a front view showing a modification of the plate fin. (1) ... refrigerant pipe, (1a) ... straight pipe part, (1a ') ... straight pipe part scheduled part, (1b) ... curved pipe part, (1b') ... curved pipe part scheduled part, (2) ... plate-like fin, (A) ... heat exchanger.

Claims (1)

(57) [Claims] 1. A refrigerant pipe (1) is bent in a meandering shape, and plate-like fins (2) are attached to respective straight pipe portions (1a) at predetermined intervals so as to penetrate therethrough. In a method for manufacturing a heat exchanger with plate-like fins in which the pipes (1a) are arranged in a staggered manner in the direction in which the pipes are arranged, a straight refrigerant pipe (1) is provided with a curved pipe section (1).
b ′), plate-like fins (2) are mounted in a penetrating state at predetermined intervals, and then each straight pipe portion (1a ′) of the refrigerant pipe (1) is staggered in the longitudinal direction. After performing a stepping process on each of the curved pipe sections (1b ′) so that the arrangement is made,
The curved tube portion (1b ') on which the step processing is performed is bent into a U-shape so that the straight tube portion (1a') on both sides thereof are parallel to each other. , A method of manufacturing a heat exchanger with plate fins.