JP2990301B2 - Meandering heat exchanger with plate and fin, and method and apparatus for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meandering heat exchanger with plate fins for use in, for example, refrigerators, vending machines, dehumidifiers, evaporators and condensers in low-temperature showcases, and a method and apparatus for producing the same. It is.

[0002]

2. Description of the Related Art Conventionally, a group of pipes in front and rear two rows meandering as viewed from the front, and a group of parallel plate fins which are connected and fitted in two rows of straight pipes in each stage and are independent in each stage. Such meandering heat exchangers are already known, and in this case it is already known to arrange the straight pipe sections in a staggered manner as viewed from the side.

[0003]

However, according to such a conventional meandering heat exchanger with plate fins, the so-called staggered arrangement of the pipe straight pipe section is surely prevented against wind from above or below. Effect, that is, all pipe straight pipes are located on different planes according to the direction of wind flow, and all pipe straight pipes come into contact with wind and turbulent flow to wind passing through the heat exchanger Can cause
Although the effect of excellent heat exchange performance can be expected, since the straight pipe section of each stage of the meandering heat exchanger is at the same level, the straight pipe section is not exposed to wind from before or after. There is a problem that the effect of the staggered arrangement of the pipe cannot be expected. However, since this type of meandering heat exchanger has a group of independent parallel plate fins stacked in multiple stages, the ventilation opening area from the front or rear surface is larger than the ventilation opening area from the plane or bottom surface. In many cases, the amount of air flow per unit time often uses a ventilation opening from the front or rear surface. Therefore, there is a case where it is better to send the wind to the heat exchanger from the front surface or the rear surface, so that the heat exchange performance is better. Conventionally, the straight pipe portions of the two rows of meandering pipes are arranged at different levels. The appearance of a meandering heat exchanger with plate fins having good heat exchange performance has been strongly desired.

SUMMARY OF THE INVENTION The present invention has been made in response to the above-mentioned conventional needs, and has plate fins having good heat exchange performance in which the straight pipe portions of the two front and rear meandering pipes are all arranged at different levels. It is an object of the present invention to provide a meandering heat exchanger and a method and apparatus for manufacturing the same.

[0005]

In order to achieve the above object, the present invention firstly provides a pipe having two rows of front and rear pipes meandering from the front and two straight pipe sections of both pipes. It consists of a group of parallel plate fins that are commonly fitted and arranged in multiple stages, and the straight pipe portions of the serpentine pipes in the front row are arranged in order from the highest to the lowest.
The adjacent pipes are arranged alternately at wide and narrow intervals, and the straight pipe sections of the serpentine pipes in the rear row are adjacent to each other in order from the highest to the lowest. Contrary to the case of the pipes in the front row, plate fins in which the straight pipes of the front and rear pipes are all arranged at different levels by being alternately arranged at narrow intervals and wide intervals The meandering heat exchanger is attached.

According to a second aspect of the present invention, there is provided a method of manufacturing the meandering heat exchanger with the plate fins, wherein the fins are composed of parallel plate fins having two front and rear pipe insertion holes having different heights. Are arranged at predetermined intervals, and the front and rear two pipe insertion holes of all the fin groups are respectively positioned on the same straight line. Next, the front and rear two straight pipes are inserted into the pipe insertion holes of these fin groups. After the material is inserted, the diameter of these pipe materials is increased over substantially the entire length, the pipes and the fin group are connected to each other in the length direction of the pipes via finless portions, and both pipes are finned. In the no-end part, the straight portions of the front and rear pipes are all arranged at different levels by bending them so that their curvatures are different from each other, and bending them in a meandering shape when viewed from the front. Characterized by producing a heat exchanger, it is summarized as method for producing the plate with fins serpentine heat exchanger.

Further, a third invention is an apparatus for manufacturing the meandering heat exchanger having the plate and fins, wherein the two pipe-fitting grooves are arranged at different heights from each other, have the same developed length, and have different curvatures. The pipes are respectively moved into these grooves by moving along two pipe guides of a fixed-side split mold that is disassembled and disassembled and has a curved pipe guide having a curved shape. The gist of the present invention is an apparatus for manufacturing a meandering heat exchanger with plate and fins, comprising a pair of drive side pipe bending rollers for bending to hold down.

The pipe expansion method in the method of the second invention is, for example, a method in which a straight pipe material having a smaller diameter is inserted into the pipe insertion holes of the plate fins of all the fin groups. By applying lubricating oil to the inner surface of the pipe material and inserting the mandrel into the pipe material, the diameter of these pipe materials is expanded substantially over the entire length, and the mechanical expansion method that connects the pipe and the fin group Similarly, with the straight pipe material having a smaller diameter inserted through the pipe insertion holes of the plate fins of the fin group, both ends of each pipe material are closed, and a high-pressure There is a fluid pressure expansion method in which a high-pressure fluid composed of a liquid or gas is introduced, the diameter of each pipe material is increased over substantially the entire length, and the pipes and the fin group are connected.

[0009]

According to the meandering heat exchanger with plate and fins, since the straight pipe portions of the two rows of front and rear pipes that are meandering when viewed from the front are all arranged at different levels, the front and rear winds can be reduced. On the other hand, the effect of the so-called staggered arrangement of the pipe straight pipe sections can be expected, and all pipe straight pipe sections are located at different levels according to the direction of wind flow, and all pipe straight pipe sections are And a turbulent flow can be generated in the wind passing through the heat exchanger, and the heat exchange performance is excellent.

[0010] According to the method of the present invention, the fin groups composed of parallel plate fins having two front and rear pipe insertion holes having different heights are arranged at predetermined intervals, and all the fin groups are arranged. The front and rear two pipe insertion holes are positioned on the same straight line, and then the two front and rear straight pipe materials are inserted into the pipe insertion holes of these fin groups and connected, and both pipes are without fins. By bending the parts so that their curvatures are different from each other and bending in a meandering shape as seen from the front, the straight pipes of both front and rear pipes are all arranged at different levels,
As described above, a meandering heat exchanger with plate fins having excellent heat exchange performance can be manufactured very efficiently.

According to the manufacturing apparatus of the present invention, two straight front and rear pipe pipes are inserted into a pipe insertion hole of a fin group composed of parallel plate fins having two front and rear pipe insertion holes having different heights from each other. In the state where the pipes are inserted and joined, the finless portions of the front and rear pipes are applied to a split curved pipe guide having two pipe fitting concave grooves having the same developed length and different curvatures, and this pipe guide is provided. Move a pair of pipe bending rollers on the drive side along
By bending each of the pipes so as to press them into these grooves, the method of the present invention can be carried out reliably and smoothly, and the above-mentioned meandering heat exchanger with plate fins can be efficiently manufactured. It can be secured.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings.

In this specification, front and rear, left and right, and up and down are based on FIG. 1, the front is the left side of FIG. 1, the rear is the right side, and the left is the front side of the drawing sheet. The right side means the back side, the upper side means the upper side of the figure, and the lower side means the lower side.

First, referring to FIGS. 1 and 3, a meandering heat exchanger with plate fins (10) of the present invention comprises two rows of pipes (1) and (2) which are meandering when viewed from the front, and both pipes. (1) (2)
A group (3A) of parallel plate fins (3) which are fitted in common over the two straight pipe portions (1a) and (2a) and arranged in a multi-stage manner, and the meandering pipes (1) in the front row The straight pipes (1a) are arranged vertically adjacent to each other in order from the highest one to the lowest one. A wide interval (L1) and a narrow interval (L2)
The meandering pipe in the back row (2)
The straight pipe section (2a) of the pipes in the front row above each other are vertically adjacent to each other in order from the highest to the lowest.
Contrary to the case of (1), the pipes are arranged alternately at a narrow interval (L2) and a wide interval (L1), so that both front and rear pipes are arranged.
(1) The straight pipe sections (1a) and (2a) of (2) are all arranged at different levels.

The above-mentioned meandering heat exchanger with plate and fins
(10) is produced by the following three steps according to the method of the present invention.

First step: A fin group (3A) composed of parallel plate fins (3) having two front and rear pipe insertion holes (4) (4) of different heights from each other.
Are arranged at predetermined intervals, and the two pipe insertion holes (4) and (4) before and after all the fin groups (3A) are positioned on the same straight line, and then these fin groups (3A) The front and rear two straight pipe blanks (11) and (12) having smaller diameters are inserted through the pipe insertion holes (4) and (4) (see FIG. 2).

In this embodiment, as the straight pipe materials (11) and (12), 1 is bent into a hair pin shape.
A book pipe is used.

Second step Next, as described above, the pipe insertion holes (4) and (4) of the fin group (3A)
In addition, two straight pipe materials (1
1) With the (12) inserted, close the ends of the respective pipe materials (11) and (12), and apply a high-pressure fluid consisting of a high-pressure liquid or gas into each of the pipe materials (11) and (12). Introduce and expand the diameter of each pipe material (11) (12) over almost the entire length, by the so-called fluid pressure expansion method, pipe (1) (2) and fin group (3A)
Are connected to each other in the longitudinal direction of the pipes (1) and (2) via finless portions (1b) and (2b) (see FIG. 2).

The pipes (1) and (2) and the fin group
Of course, a mechanical expansion method using a mandrel may be adopted for the connection with (3A).

Third step Finally, the two front and rear pipes (1) and (2) are bent so that their curvatures are different from each other at the respective finless portions (1b) and (2b). The straight pipes (1a) (2a) of both front and rear pipes (1) (2)
Produces heat exchangers all located at different levels.

The plate used in the third step
Details of the finned meandering heat exchanger manufacturing apparatus are shown in FIGS.
This is shown in FIG.

Referring to FIGS. 4 to 6, the meandering heat exchanger manufacturing apparatus according to the present invention has two pipe fitting grooves (2) which are arranged at different heights from each other, have the same developed length, and have different curvatures.
3) Two pipes, a fixed-side split mold (20) having a curved pipe guide part (21) and (22) having a (24) and capable of being disassembled and disassembled, and a fixed-side split mold (20) in an assembled state. The guides (21) and (22) move along the pipes (1) and (2) into these grooves (23) and (24), respectively.
And a pair of drive-side pipe bending rollers (31) and (32) that bends to hold down.

In the third step, pipes in two rows before and after
(1) In order to make (2) bend so that the curvature is different from each other in the respective finless portions (1b) and (2b), the finless portions (1b) and (2b) of the front and rear pipes (1) and (2) are used. In the fixed side split mold (20) in the assembled state, a curved pipe guide portion (21) having two pipe fitting concave grooves (23) and (24) having the same developed length and different curvatures. (22), a pair of drive-side pipe bending rollers (31) and (32) are moved along the pipe guides (21) and (22), and the inside of these concave grooves (23) and (24) are moved. ) Are bent into a semicircular shape and a substantially U-shape to the end of the pipe so as to press the pipes (1) and (2) respectively. In addition, the fixed side split type (20) has three members (20a) (20b) (20c)
After bending the pipes (1) and (2), remove the middle split mold component (20b) and reduce the split mold (20). It can be removed (see FIG. 7).

The above-mentioned meandering heat exchanger with plates and fins
According to (10), two rows of pipes are meandering when viewed from the front.
Since the straight pipe sections (1a) and (2a) of (1) and (2) are all arranged at different levels, the straight pipe sections (1a) and (2a) of The effect of so-called staggered arrangement can be expected, and all pipe straight pipe sections (1a) (2a) are located at different levels according to the direction of the flow of wind (A),
All pipe straight pipe sections (1a) and (2a) come into contact with wind (A) and can generate turbulence in the wind passing through heat exchanger (10), which has excellent heat exchange performance Things.

In the above embodiment, the straight pipe blanks (11) and (12) are each formed into a hairpin shape.
Although pipes are used, these pipe materials (1
As 1) and (12), two separate pipes may be used, and the connection-side ends of both pipes may be connected to each other by, for example, a U-shaped bend pipe.

The meandering heat exchanger with plate fins according to the present invention is used, for example, as a refrigerator, a vending machine, a dehumidifier, an evaporator and a condenser in a low-temperature showcase.

[0027]

The meandering heat exchanger with plate fins according to the present invention, as described above, is fitted and covered in common with the two rows of front and rear pipes that are meandering when viewed from the front and the two straight pipe portions of both pipes. Parallel plates arranged in multiple stages
It consists of a group of fins, and the straight pipe section of the meandering pipe in the front row is arranged with wide and narrow intervals alternately next to each other vertically from the top to the bottom one in order. In addition, the straight pipe sections of the serpentine pipes in the rear row are arranged in order from the top to the bottom, and are alternately narrow in the opposite direction, opposite to the pipes in the front row. Since the straight pipe sections of both the front and rear pipes are all arranged at different levels by being spaced apart from each other, the effect of the so-called staggered arrangement of pipe straight pipe sections against wind from the front or rear According to the direction of the wind flow, all pipe straight pipes are located at different levels, and all pipe straight pipes come into contact with the wind and the wind passing through the heat exchanger Can create turbulence, One in which exchange performance is excellent.

Usually, this kind of meandering heat exchanger is
Because the group of independent parallel plate and fins is stacked in multiple stages, the ventilation opening area from the front or rear side is often larger than the ventilation opening area from the flat or bottom surface, and the ventilation volume per unit time is Or, it is more common to use a ventilation opening from the rear side, and therefore, it may be better to send the wind to the heat exchanger from the front or rear side, and the heat exchange performance may be better. The meandering heat exchanger has an effect that it is very advantageously applied as a heat exchanger in such a case.

According to the method of the present invention, the fin groups composed of the parallel plate fins having the two pipe insertion holes at the front and the rear at different heights are arranged at predetermined intervals, and all the fin groups are arranged. The front and rear two pipe insertion holes are positioned on the same straight line, and then the two front and rear straight pipe materials are inserted into the pipe insertion holes of these fin groups and connected, and both pipes are without fins. By bending the parts so that their curvatures are different from each other and bending in a meandering shape as seen from the front, the straight pipes of both front and rear pipes are all arranged at different levels,
As described above, there is an effect that the meandering heat exchanger with plate fins having excellent heat exchange performance can be manufactured very efficiently.

Further, according to the manufacturing apparatus of the present invention, two straight front and rear pipe material are inserted into the pipe insertion holes of the fin group including the parallel plate fins having two front and rear pipe insertion holes having different heights from each other. In the state where the pipes are inserted and joined, the finless portions of the front and rear pipes are applied to a split curved pipe guide having two pipe fitting concave grooves having the same developed length and different curvatures, and this pipe guide is provided. Move a pair of pipe bending rollers on the drive side along
By bending each of the pipes so as to press them into these grooves, the method of the present invention can be carried out reliably and smoothly, and the above-mentioned meandering heat exchanger with plate fins can be efficiently manufactured. The effect that it can secure is produced.

[Brief description of the drawings]

FIG. 1 is a left side view of a meandering heat exchanger with plate fins according to the present invention.

FIG. 2 shows a method of manufacturing a meandering heat exchanger with plate fins according to the present invention, in which a pipe and a fin group are joined together.
FIG. 4 is a schematic perspective view showing a state before pipe bending.

FIG. 3 is a schematic perspective view of a meandering heat exchanger with plate fins according to the present invention.

FIG. 4 is an enlarged front view of a main part showing a state before bending a pipe in a step of manufacturing a heat exchanger by the apparatus of the present invention.

FIG. 5 is an enlarged front view of a main part showing a state after the bending.

FIG. 6 is an enlarged plan view of a partially cutaway main part showing a state in the middle of the bending.

FIG. 7 is an enlarged front view of a main part showing a state in which a split mold is removed after bending a pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Meandering front pipe 1a Straight pipe part 1b No fin part 2 Meandering rear pipe 2a Straight pipe part 2b No fin part 3 Plate fin 3A Fin group 4 Pipe insertion hole 10 Meandering heat exchanger with plate fin 11 Front straight pipe material 12 Rear straight pipe material 20 Fixed side split mold 21 Curved pipe guide part 22 Curved pipe guide part 23 Pipe fitting groove 24 Pipe fitting groove 31 Pipe fold on driving side Roller for bending 32 Roller for bending pipe on the driving side L1 Wide interval L2 Narrow interval

Continuation of the front page (56) References JP-A-59-225834 (JP, A) JP-A-60-240987 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 53 / 08 F28D 1/047 F28F 1/00-1/44

Claims (3)

(57) [Claims] 1. Two rows of pipes, meandering when viewed from the front
(1) (2) and the parallel plate fins (3) which are fitted over the two straight pipes (1a) (2a) of both pipes (1) and (2) and arranged in multiple stages Group (3A), the straight pipe section (1a) of the meandering pipe (1) in the front row is arranged from the top to the bottom in order from the top to the bottom, alternately and widely apart from each other. L1) and a narrow interval (L2), and the straight pipe section (2a) of the serpentine pipe (2) in the rear row is vertically adjacent to the pipe from the top to the bottom. Contrary to the case of the pipes (1) in the front row, the pipes (1) and (2) are arranged alternately at a narrow interval (L2) and a wide interval (L1). A meandering heat exchanger with plate fins in which the straight pipe sections (1a) and (2a) are all arranged at different levels. 2. A fin group (3A) composed of parallel plate fins (3) having front and rear two pipe insertion holes (4) and (4) of different heights is arranged at predetermined intervals. The two pipe insertion holes (4) and (4) before and after all the fin groups (3A) are positioned on the same straight line, and then the pipe insertion holes (4) (4) (4 ), The two straight pipe materials (11) and (12) are inserted into the pipe material.
(11) Expand the diameter of (12) over almost the entire length and
(1) (2) and the fin group (3A) are connected to each other in the longitudinal direction of the pipes (1) and (2) via finless portions (1b) and (2b), and both pipes (1 ) (2) is bent so that the curvatures are different from each other in the finless portions (1b) and (2b), and each is bent in a meandering shape when viewed from the front, so that both front and rear pipes (1)
A method of manufacturing a meandering heat exchanger with plate fins, wherein the straight pipe sections (1a) and (2a) of (2) are all arranged at different levels. 3. A curved pipe guide portion (21) (22) having two pipe fitting concave grooves (23) (24) which are arranged at different heights from each other and have the same developed length and different curvatures. The fixed-side split mold (20) that can be assembled and disassembled, and the fixed-side split mold (2
(0) and a pair of driving sides that move along the two pipe guides (21) and (22) and bend so as to press the pipes (1) and (2) into these grooves (23) and (24), respectively. An apparatus for manufacturing a meandering heat exchanger with plate fins, comprising: pipe bending rollers (31) and (32).