JPS58181523A - Preparing method of heat exchanger - Google Patents

Abstract

PURPOSE:To improve work efficiency, by connectively constituting pipe insertion holes, bead width cutting unit and length cutting unit or the like. CONSTITUTION:Pipe insertion holes 11 are formed to an aluminum stripe 10 of small thickness plate, then a bead part is formed parallelly in the ventilating direction at use as a heat exchanger by a unit 20 molding a long and narrow bead part, further plural rows of continuous fins are formed by plural width cutting blades 12. Here width cutting by a desired fin length is performed by the blade 12 and then a width cut unit is moved in the lateral direction by the dimension, in which an end face of the fin is zigzag formed, to perform cutting by the fin length. Accordingly, the generation of extractive refuse at molding of the fin is eliminated, and the heat exchanger with large strength of the fins, an end face of which is zigzag arranged, can be high efficiently worked by a simple device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn construction method for a heat exchanger, and is a method for manufacturing a heat exchanger in which long width fins and short width fins are stacked alternately so that the end face of the horn fins becomes one bird.

Conventionally, the manufacturing method for heat exchangers with thick fin pinches (and staggered fin end faces, such as refrigerator evaporators) is to mold fins of different widths, and then place these fins in a comb-shaped alignment layer. A method of inserting the parts and assembling them one after the other is known as a publicly known technique.This manufacturing method is mostly manual, and even if it is mechanized, the production speed is slow and the equipment is complicated. Therefore, heat exchangers for room air conditioners, which have a structure in which the fin pitch is secured by the curl height of the pipe insertion hole and use many fins, have disadvantages such as high cost. It has been impossible to manufacture the end face with a square shape using known techniques.

An object of the present invention is to manufacture a heat exchanger in which long width fins and seven short width fins are piled up at an alternating pressure so that the fin end tfi becomes T'15 using a simple and highly productive manufacturing method.

The present invention has been made in the following points.

Over the past few years, heat pump type room air conditioners have become more economical than other heating devices due to improvements in their heating capacity, and their perspiration rate has rapidly increased due to their high safety and cleanliness.

・Generally heat pump type room air conditioners (well, as shown in Figure 1, this is an air conditioner that uses a four-way valve 2 to change the flow of refrigerant and can perform cooling in the summer and heating in the winter. Heating operation uses outdoor heat exchange. After absorbing outdoor heat through a four-way valve 2 and pumping it up in an E-compressor 1, the heat is radiated indoors through an indoor heat exchanger 5, and then into a capillary tube 4 and an outdoor heat exchanger 3.
The mechanism is such that the refrigerant power is circulated. Heat pump type room air conditioners are now widely used in cold regions, but when operating a heating system in such regions, the outside temperature power (
Because of the low (X) frost builds up on the indoor heat exchanger, this reduces the air volume and significantly lowers the heating capacity. The flow of refrigerant is frequently reversed and the high-temperature gas refrigerant is sent to the outdoor heat exchanger for defrosting.Therefore, the time required for defrosting is approximately 10 minutes (, z (well, nu + d). This is a major drawback of heat pump room air conditioners.

On the other hand, the frost-resistant heat exchanger structure is similar to the evaporator 2iS of a refrigerator (Finviso F5 on the ventilation side of the heat exchanger).
Gradually, the number of finpi and nochi was strengthened. This heat exchanger structure can significantly increase the time it takes for the fins to become clogged with frost and the air volume to decrease.Experiments have shown that the time required for outdoor heat exchangers to It has been confirmed that by arranging the fin end face on the population side in 2 to 4 squares, the frost distribution can be improved and the defrosting interval time can be extended by about 15 to 20 times compared to the conventional method ( ,Xru.

However, the fins do not produce waste, resulting in high production costs.

Moreover, since there was no inexpensive method for manufacturing a heat exchanger with staggered fin end faces, it was not possible to put it into practice.

The present invention is based on conventional fin molding [moderate bead opening IF? This is a very useful and inexpensive manufacturing method that makes it possible to make AJ2 heat exchangers with a 1-inch fin end face by changing the unit, width cutting unit, and its system (wholesale unit). It is.

The present invention can also be applied to heat exchangers with coarse fin pitches, such as refrigerator evaporators in which fin pinch cannot be ensured due to the curl height of the fins.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 to 5.

FIG. 2 shows an outdoor heat exchanger 3 manufactured according to the present invention in which the end face of the fins on one side is staggered, and the fins are provided with a staggered surface on the population side in the ventilation direction A. This heat exchanger has two types of fins, short width fins 7 and long width fins 8, stacked alternately.
This is a summary of the ITI version of pipe 9.

When the heat exchanger is assembled, various forces are applied to the fin end faces (
(The force applied to the fins is especially large when expanding a pipe using a pipe expansion head.) However, in the case of a heat exchanger with a rounded fin end surface, the pressure receiving area of the fins is halved, so the long width The end face of the fin is easily deformed. Therefore, an elongated heat portion is formed on the fin to increase the strength of the fin.

This type of heat exchanger has a fin width of 2 + medium 1j (it is not limited, but fins of multiple types of fin widths may be overlapped at an angle of r7°, and the fin end faces on both sides are shaped like birds). However, an example of a method for manufacturing a heat exchanger in which the fin end face on one side is staggered will be described here.

Figure 3 shows a unit 20 that forms a pipe insertion hole 1 in a thin aluminum strip 10 by drawing, I-1 ironing, etc., and then forms an elongated bead portion. An elongated bead part parallel to the ventilation direction is formed at any position except the fin pipe insertion hole, and a plurality of width cutting blades 12 are used to form a plurality of continuous rows of fins. Here, as shown in Fig. 4, the width cutting blade 12 is assembled into the width cutting unit for the width cutting new edition, and after cutting the width for the desired fin length, the fin end face is cut using the ``I'' method. The width cutting unit is moved in a direction perpendicular to the fin feeding direction to perform width cutting corresponding to the fin length. Thereafter, by repeating the same fin feeding and movement of the width cutting unit, it is possible to manufacture a heat exchanger with the fin surface of the heat exchanger having a square shape.

Here, the movement dimension of the width cutting unit is 1'l of the heat exchanger:
In relation to performance, a small amount of about 2 to 41 II m is sufficient, but generally, fin forming presses are processed at high speeds of 200 to 300 m) to increase productivity, so it is necessary to process the fins for a very short period of time (for example, when the press speed is In the case of 30Qrpnl, it is necessary to relocate 2 to 4 width cutting units in 2001TIS'). In order to move the width cutting unit quickly and with little force, for example the width cutting unit can be moved from L to M.
It can be placed on a guide or the like and moved using a cylinder or the like. In addition, width cutting unit! In order to ensure the movement of ・and synchronize it with the press, it is recommended to use a cam mechanism or the like to connect and synchronize it with the ram of the press.

Also, as shown in Figure 5, the width of the fin end surface is l; 7J to make it staggered.
In the new position (here, two width-cutting upper cutting blades 17a and 18a are separated by the staggered dimension of the fin end face, and the above two upper cutting blades are installed separately on the upper cutting blade Ii 19 a,
], 9 Attach to b. The width-cutting lower cutting blade 18 has a thickness equal to the staggered dimension of the fin end face, and is integrated with the lower cutting blade 18. In the width cutting mechanism as shown in FIG. 5, for example, 111; IJ force claw mounting plate 19a is struck and the width cutting upper cutting blade 17a cuts the width of the desired fin length, and then the upper cutting blade mounting plate 19b Cut the desired fin length using the upper cutting blade 7b.

By repeating this cutting method, it is possible to form fins with staggered fin end faces, and depending on whether two or one width cutting upper cutting blade is used, the fin end faces can be staggered on both sides of the heat exchanger or on one side. You are free to do whatever you want. The two width-cutting blades may be attached to the upper blade as shown in FIG. 5, or may be attached to the lower blade.

In the present invention, in order to operate the width cutting blade intermittently as appropriate,
It is necessary to provide the length cutting blade 14 at a position separated by an integral multiple of the fin feed length.

Furthermore, if the cutting blade shape is a two-step blade, it is possible to avoid cutting overlapping widths even when half-feeding is involved when cutting the fin length of the heat exchanger.

Half-feed means that when the length of the fin fed by the fin feed claw 13 is 22 (mm), if the length of the fin is 23 n x a (mm), the fin is fed n times. Finally, it is necessary to send a (mm) that is half the normal feed length, and the feed of a (rrm) is called a half feed.

In reality, when feeding the normal 23 Crtan) fin in Fig. 4, the engagement depth of the width cutting blade 12 is deepened to cut 2a (mm), and the half-feed a ( m
When feeding the fins at a distance of a (mm), the depth of engagement of the width-cutting cutting blades 12 may be made shallow to perform a cut of a (mm).

Width cutting is performed as described above, and the short width fins 7 and long width fins 8 are formed alternately and continuously, and the boundary between the short width fins 7 and the long width fins 8 is cut by the length cutting cutting blade 14 in the fin feeding direction. Cut at right angles to.

When the cut fins are stacked one after another on the bar 1.5 using a free fall method, the short width fins 7 and the long width fins 8 can be stacked one by one at the intersection 77.

After taking out the fins stacked on the bar] 5 and inserting the 0-shaped pipe 9 into these fins, 1. The heat exchanger can be protected using known production methods.

According to the present invention, no scrap is generated during fin molding, and the conventional production method can be significantly changed.
Since a heat exchanger with strong fin strength and a staggered fin end face can be manufactured with high efficiency using a simple device, the economical effects are very large.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the refrigerating machine cycle of a heat pump type room air conditioner, Figure 2 is a heat exchanger in which one end of the fins is staggered according to an embodiment of the present invention, and Figure 3 is a heat exchanger with alternating short and long fins. Perspective views illustrating the molding process, Figures 4 and 5
The figure is a perspective view of the width cutting cutter J. DESCRIPTION OF SYMBOLS 1...Compressor, 2...Four-way valve, 3...Outdoor heat exchanger, 4...Capillary tube, 5...Indoor heat exchanger, 6: Long and narrow bead part, 7...Short width fin , 8...
Long width fin, 9...U-shaped pipe, 1o...aluminum strip, 11...pipe insertion hole, 12...width cutting blade, 1
3 Fin feed claw, 14 length cutting blade, J5...Buffer is bar, 16...2-step blade, 17a, 17b...Width cutting upper cutting blade, 18...Width cutting lower cutting blade, 19a , 19b・
...Upper cutting blade mounting plate, 20...Elongated pea molding unit. /(Kl Figure 2 Figure 3 Ill Figure 4 Figure 5 Exit

Claims (1)

[Scope of Claims] 1. In a heat exchanger combining a large number of fins and a large number of pipes in which plate-shaped long-width fins and short-width fins are stacked one on top of the other at an intersection σ, the pipe insertion holes of the fins a unit for forming the elongated bead portion, a width cutting unit for cutting the width of the fin, a control unit for appropriately operating the width cutting unit, and a fin feeding unit for feeding the fin. A method for manufacturing a heat exchanger characterized by comprising a length cutting unit that cuts the fins to the specified length, and a fin stacking claw unit that sequentially stacks the fins cut to length. 2. The manufacturing method of the heat exchanger according to claim 1, wherein elongated bead portions are formed in parallel to the ventilation direction at arbitrary positions other than the pipe insertion holes of the long width fins and the short width fins.