JPS59153532A - Production of heat exchanger - Google Patents

Abstract

PURPOSE:To produce a heat exchanger inserted with thin plate fins in a zigzag shape with pipes at high productivity by arraying the folded thin plate fins apart from each other at a space and inserting linearly the pipes through the fins, bending the pipes between the fins and assembling the fins into plural stages. CONSTITUTION:A belt-like plate material 8 of a light gage delivered continuously in an arrow A direction by feed rolls 10 is punched with pipe inserting holes at a prescribed pitch by a press punch 12 and is thereafter formed with folded projecting parts 18 and trough parts 20 of a rectangular shape by press tools 14, 16. Such material is cut to a prescribed length, by which bellows fins 24 are manufactured. Six pieces of such fins 24 are arrayed linearly at a specified interval and a pipe 34 for passing a refrigerant is inserted into the above- mentioned inserting holes. The insertion of the pipe 34 is easily accomplished by an attachable and detachable member for inserting and guiding the pipe having a pipe guide part (not shown in a figure). The pipe 34 between said fins 24 is folded successively 180 deg. and the fins 24 are disposed in six stages; side plates 60, 60 are further attached thereto and the heat exchanger for a refrigerator, etc. is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a heat exchanger, and relates to a heat exchanger in which a thin plate is bent and formed into a frame, a plurality of lζ fins are arranged in parallel, and tubes are inserted into these fins in a meandering manner. Concerning the manufacturing method.

Conventionally, in heat exchangers such as evaporators for refrigerators, a so-called serpentine duplex 6 as shown in FIG. 2 is combined with a plate fin 4 in which a chew 1 insertion groove 2 is formed as shown in FIG. Typically, a heat exchanger is used. However, in this type of heat exchanger, in order to fix the meandering tube 6 to the plate fin 4, the meandering duplex 6 is made flat in advance, and after the flattened meandering tube 6 is inserted into the insertion groove 2 of the plate fin 4. The flat part is pressed with a punch or the like to restore the tube 6 to a cylindrical shape. Therefore, an extra step of flattening the chicove and a flattening machine are required, resulting in a problem of poor productivity. Furthermore, when the flat portion of the tube is pressed to restore its cylindrical shape, the fins must have a thickness of at least a certain level so that they can withstand the pressing force. Therefore, the heat transfer area between the meandering tube and the fins is relatively small, and since the tube insertion groove is notched, the heat transfer area becomes even smaller, resulting in poor heat exchange performance. This is true not only for refrigerator evaporators but also for other types of heat exchangers.

In order to solve the above problems, we arranged multiple stages of independent twin thin plates in parallel, inserted the tube into the insertion hole formed in these, and then heated the dicove into a serpentine shape using an analytical surface. An exchanger is being considered. This heat exchanger eliminates the need for insertion grooves for inserting meandering tubes into the fins, and can solve the above problem, but when manufacturing it, it is difficult to insert the ZL-1 into the insertion holes of the fins. (The fins are sometimes made of thin plates.)
- It deforms during insertion, making it difficult to insert, and the tip has to be bent into a meandering shape after insertion, resulting in poor workability. There was a problem with it being bad.

The present invention has been made in view of the above-mentioned circumstances, and the purpose and origin of this bag is to provide a heat sink constructed by inserting a tube in a meandering manner through a plurality of thin plate fins arranged in parallel. The purpose of the present invention is to provide a highly productive manufacturing method that facilitates automation and continuous operation in manufacturing exchangers.

The gist of the present invention, which was made to achieve such an object, is similar to that of a heat exchanger in which a plurality of fins formed by bending thin plates are arranged in parallel, and tubes are inserted over these fins in a meandering manner. A method of manufacturing, wherein fins formed by bending a band-shaped plate are arranged in a straight line at predetermined intervals, and a removable pipe insertion guide member having an interior of a pipe conduit is formed by bending the fins. This manufacturing method involves inserting a tube through one end of the fins, and then bending the tube located between the fins so that each fin is arranged in multiple stages.

According to the present invention, the tube insertion guide member is removably fitted into the bent portion of the fin, and the guide member of the bracket is formed with the inside of the pipe conduit that guides the insertion of the tube. It is easy to insert the tube into the hole in the fin, and the fitting of the tube insertion guide member prevents the fin from deforming, making it easy to automate and serialize the work. Furthermore, since the tubes between the fins arranged in a straight line at predetermined intervals are bent in this way, it is easy to automate and perform continuous operations, which in turn increases productivity and reduces costs. It is possible to reduce the

An embodiment in which the present invention is applied to a method for manufacturing a refrigerator evaporator will be described in detail below with reference to the drawings.

At d5 in FIG. 3, 8 is a thin strip-shaped plate material wound into a roll, which is held between a pair of feed rolls 10, and is continuously fed out in the direction of the arrow, and is punched at a predetermined temperature by a press punch 12. The tube insertion hole is drilled at the pitch. The plate thickness is usually 0.06.about.Q and the culm degree is 8+nm.

The strip-shaped plate material 8 with the tube insertion holes drilled therein is further fed, and is primarily formed into a predetermined pitch by a press tool 14 of a press machine, and is then subjected to secondary (A-top) forming by a press tool 16 that works in conjunction with the press tool 14. and a rectangular bent protrusion 1
8 and troughs 20 are formed, and cut to a predetermined thickness by a cutter 22 to produce bellows fins 24. For bending, the tube insertion hole is Jli ttb\ part 18 radical 820
This is done so that they are aligned in a straight line near the center of each plane between them.

The bent bellows fin 24 is placed on a predetermined base (not shown).
4, and the tube insertion guide member 26 is fitted into the recess between the bent protrusions 18, as shown in FIG. Guide member 26
consists of a pair of square members 28 as shown in FIG.
A groove with a semicircular cross section is provided at the front end of the image, and when the two come into contact, a cylindrical hole 30 is formed. Each guide member 26 is arranged so that its mating hole 3o is on the same straight line and on the center line of the tube insertion hole of the bellows fin 24, and the inner diameter of the hole 3o is the same as that of the tube 30 for refrigerant flow.
from one end of the bellows fin 24 to the pipe 3.
4 can be inserted.

The opposing members 28 of each guide member 26 are moved toward and away from each other in a direction perpendicular to the paper plane of FIG. 4 by a hydraulic cylinder (not shown). An aluminum tube 34 wound in a ring shape is held between a pair of feed rollers 36 and sent out in the direction of arrow B, and is held between a pair of correction rollers 38 to straighten the bend. The fabric weight having a pair of date U rollers 40 is sent to a molding machine (not shown) and is kissed. As shown in FIG. 6, the mouth of the roller 4o is slightly narrower at one end than the other end, the pair of rollers 4o rotate in opposite directions, and the tube 34 has both L]-
It is narrowed by the outer surface of the rubber 40, and a portion 42 is formed. After the end of the mouth, the date molding machine is removed, and the []-marked part 42 is gripped by a ticking tool 46 attached to the tip of a rod 44, as shown in FIG. Although illustration of the internal mechanism of the chucking 46 is omitted, its outer diameter is narrower than the tube 34, and the bellows fin 2
It is designed so that it does not cause any trouble when inserted into the insertion hole No. 4. The chucking tools 46 are arranged in a straight line from 1 to 4, and are inserted through one end of the bellows fins 24 so as to be able to chuck the tube 34. After lagging, the pipe 34 is pulled in the direction B,
As shown in FIG. 4, the bellows fins 24 are sequentially inserted from one side to the other, and are passed through the entire body.

After insertion, both P3+1 members 28 of each guide portion key 426 move back in the direction of one inch away from the bellows fin 24. As a result, a plurality of (six in this embodiment) bellows fins 24 are arranged in a straight line at regular intervals, forming -units. After the formation of -1 leek, the tube 34 is cut with a cutter (not shown). FIG. 8 shows this state. (Some of the six fins are omitted from the drawings.) The chucking fitting 46 is pulled by a hydraulic cylinder (not shown) via the rod 44, and after the tension is finished, the gripping of the chucking fitting 46 is released. During tensioning, since the tube insertion guide member 26 is fitted between each bent portion of the bellows fin 24, deformation of the fin 24 can be prevented. Therefore, it becomes easy to automate the insertion of the tube 34 and make it a continuous operation. Note that if the fin 24 has a hole through which the tube 34 is inserted, there is no need for an insertion groove or notch as in the conventional twining type, and the contact area between the fin 24 and the tube 34 is reduced. In other words, the heat transfer area can be increased.

One piece of the bellows fin 24 inserted into the tube 34 as described above is placed in the delivery section of the bending machine (not shown), and two pieces of the bellows fin 24 are delivered.

As shown in FIG. 9, the guide roll 48 and guide roll 48 are rotatable around a fixed axis.
The tube 34 is bent 180 degrees between the bending rollers 50 which revolve around the bending rollers 48.
A similar guide 52, bending roll 54, etc. located on the opposite side of 50 bends the tube 34, the length of which is one bellows fin 24.1, 180 degrees. FIG. 9 shows this state. Thereafter, the same process is repeated (!'!10) The tube 34 for one unit is bent into a meandering shape as shown in Figure 10. Figure 11 shows the bending process of the tube 34 without fins shown. It is a process diagram.

In addition, in the process (small), after bending the tubes so that the tubes and fins do not interfere with each other, the tubes are slightly bent in the direction perpendicular to the fins. lko] culm (
In i~), the third guide roll 5G and bending roll 58 are used. In the manner described above, a refrigerator evaporator (heat exchanger) in which a tube is inserted in a meandering manner through bellows fins is manufactured.

The refrigerator evaporator manufactured in this way has a first
A lateral root 60 covering the long hole shown in Figure 0 is fixed by fitting.

Although an embodiment in which the present invention is applied to a method for manufacturing an evaporator for a refrigerator has been described above, the present invention is not limited to such an embodiment. (It goes without saying that the present invention can be implemented in various ways without departing from the gist of the present invention, such as applying it to other methods of manufacturing heat exchangers in which the fins are arranged in multiple stages and tubes are inserted in a meandering manner through these fins. It is.

As described in detail above, according to the present invention, after the tube insertion guide member having the inside of the tube conduit is removably fitted to the bent portion of the bent fin, the tube is inserted into the hole of the fin. It becomes easier to insert the tube, and the fins are less likely to be deformed when inserting the tube, making it easier to automate tube insertion and make it a continuous operation. Furthermore, in this way, at predetermined intervals -(-C
Since the manufacturing process is performed by bending the tubes between the linearly arranged fins, the process can be easily automated and continuous, unlike inserting bent tubes into the holes of the fins. As a result, productivity during heat exchanger manufacturing can be increased and production costs can be reduced.

[Brief explanation of the drawing]

The first factor is a front view of a fin used in a conventional cage-in heat exchanger, and FIG. 2 is a perspective view of the cage-in heat exchanger. Fig. 3 is a process diagram showing fin bending molding in a method for manufacturing a refrigerator evaporator according to an embodiment of the present invention, and Fig. 4 shows a state in which a tube is inserted through the fins of the same embodiment. FIG. 5 is a perspective view of the tube insertion guide part H used in the same embodiment, and FIG. 6 is an enlarged view of the main part of the tube mouth of the same embodiment showing the working state. Fig. 7 is an enlarged view of the main parts of the same embodiment showing the state in which the tube end is gripped, and Fig. 8 is a side view showing the state in which the fins are inserted into the pipe. Fig. 9 10 is an explanatory view showing a part of the bending process of the tube inserted through the fin of the same example, and FIG. Fig. 11 is a perspective view of a heat exchanger that has a heat exchanger. Fig. 11 is a process diagram showing a tube bending process (twin illustrations are omitted). 8... Band member 24... Bellows fin 26... Tube Insertion guide member 34...Pipe Fig. 1 - Fig. 2 Fig. 3 Fig. 4 43C Also) Fig. 5 Fig. 6 Fig. 7 Fig. 3 < Fig. 8

Claims (1)

[Claims] 1 Multiple stages of fins made by bending thin plates are arranged in parallel,
A method of manufacturing a heat exchanger in which tubes are inserted into these fins in a meandering manner, and the fins are formed by bending a band plate and are arranged in a straight line with a recess separated by a predetermined distance, and the fins are attached and detached with a response guide. After fitting a possible tube insertion guide member into the bent portion of the fin, the tube is inserted from one end of the fin, and the tube positioned between the fins is further bent to form each fin into multiple stages. A method for manufacturing a heat exchanger characterized by arranging the heat exchanger.