JPS5992134A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To construct an aggregated heat exchanger and to obtain many heat exchangers easily by cutting and separating the aggregated heat exchanger by forming many pipe inserting holes in a thin plate, cutting it continuously and after piling them into aggregated fins, inserting U-shaped pipes and expanding. CONSTITUTION:Many pipe inserting holes 2 are formed in a thin plate 1 made of Al etc., fed for sizing and cut the width continuously by cutting edges 3, 4, and cut to a desired length by a cutting edge 8. These are piled on a stacking bar 10 to form aggregated fins 9, and many U-shaped pipes 14 are inserted into pipe inserting holes 2. Then, the fins 9 are removed from the bar 10, and the pipes of an assembled aggregated heat exchanger 13 are expanded. Uncut parts 7 of the fins 9 are cut off and plural heat exchangers are manufactured by separation.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for manufacturing a heat exchanger, in which a collective heat exchanger consisting of a plurality of heat exchangers is assembled, a pipe is expanded, and a part of the fins is cut off. , is a heat exchanger manufacturing method that simultaneously manufactures multiple heat exchangers by separating them.

[Prior art]

Generally, so-called cross-fin type heat exchangers, which are a combination of a large number of plate-shaped fins and a large number of O-shaped pipes, are often used in air conditioning equipment.

The cross-fin type heat exchanger is generally manufactured by the following method. A large number of pipe insertion holes are formed in a thin aluminum plate using a press mold, and the desired product width is continuously cut into 11 widths, followed by cutting to an appropriate fin length to produce fins. After stacking a large number of these fins and inserting the 0-shaped pipe into the pipe insertion hole of the fin, push the tube expansion head into the 0-shaped pipe to expand the pipe diameter and fix the fin and pipe.
Furthermore, without washing this heat exchanger, a successor vibrator is brazed to complete the heat exchanger. As described above, the loss fin type heat exchanger is the best in terms of production method, cost, etc. compared to other heat exchangers, but in order to further improve price competitiveness, we have developed a heat exchanger shop. It is necessary to strongly promote FA (factory automation).

Conventional automation mainly relied on specialized equipment, so when changing product specifications, major equipment modifications were required, or the equipment could become completely unusable.
The drawback was that it was difficult to respond to diversifying market needs.

[Purpose of the invention]

An object of the present invention is to assemble a collective heat exchanger consisting of a plurality of heat exchangers assembled in the width direction, and then cut and separate a part of the fins to produce a plurality of heat exchangers. The purpose of the present invention is to provide a method for manufacturing a heat exchanger that is highly productive and flexible enough to accommodate diversification of product specifications.

[Summary of the invention]

The present invention has been made with attention to the following points. Over the past few years, heat pump room air conditioners with both cooling and heating functions have become more economical than other heating devices due to their heating capacity, and their safety has been compromised due to their cleanliness. The number of installed units is rapidly increasing, and the penetration rate of room air conditioners as a whole is increasing. On the other hand, due to the diversification of product needs and the reduction of work in progress, production lots have recently become smaller, increasing setup time and associated adjustment time for room air conditioner heat exchanger production equipment, reducing production efficiency. I'm letting you do it.・On the other hand, regarding automatic assembly of fins and pipes with high productivity, a large number of pipe insertion holes are formed in a thin aluminum plate using a press mold, and the width is continuously cut to the desired product width to form a multi-row ribbon shape. After manufacturing the fins, the above ribbon-shaped fins were pulled out of the mold and twisted and slackened while widening the distance between the ribbons.Then, cutting the fins to an appropriate length, cutting the fins to a diameter slightly larger than the pipe insertion hole of the fins. A method has been proposed in which the 111ffi fins are stacked while being pushed into a small stacking bar, and then a pipe is automatically inserted into the stacked fins. (Utility Model Application No. 55-103032) Note that the method of supporting ribbon-shaped fins with wide spacing up to the position where they are pushed into the stacking bar is a structure in which both sides of the fins are guided and supported by guide plates. This method is effective in the case of narrow ribbon-like fins with a small number of rows.

With this structure that guides and supports both sides of the fin, even if the ribbon-shaped fin is fed in a bent state due to distortion caused in the previous process, the guide plate allows accurate positioning. To ensure that fins are pushed into a stacking bar.

By making the diameter of the stacking bar into which the fins are pushed slightly smaller than the pipe insertion hole of the fin, it is possible to prevent the pipe insertion hole of the stacked fins from rubbing against each other by 1/7 inch, making it easier to insert the pipe in the next process. This improves the performance and allows automation of pipe insertion.

This method of guiding the fins in the width direction and forcing the fins into the stacking bar of the fin stacker using the guide plate allows thin plate fins to be stacked reliably, and also allows for automatic pipe insertion. Since it is easy to use, highly reliable automation can be achieved, reducing man-hours and improving equipment operating rate. However, since this method has a structure that guides both sides of the fin, it can only accommodate one type of fin width, and when the fin width changes, the fin guide plate, the position of the stacking bar, the pipe insertion device etc. A major modification will be required.

The present invention provides a method for manufacturing a heat exchanger that does not require setup of a fin pipe assembly device and is highly flexible when changing the product fin width, and is a very useful method.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In Fig. 1, a number of pipe insertion holes 2 are first formed on a thin aluminum plate 1 with a thickness of 0.1 to 0.15m+n, and then a width cutting cutting blade A3 is formed.
A width cutting unit equipped with a width cutting cutting blade B4 and a width cutting cutting blade B4 continuously cut the width of wide fins that are sequentially fed to a fixed length by a fin feeding unit (not shown).

With and It forms 6,
In the case of the width cutting blade A6, it is sufficient to continuously operate the width cutting blade A3, which is set so that the engagement length of the cutting blade is slightly longer than the fixed feed length of the fin. -Blade width cutting blade B4
In the case of , for example, the width cutting cutting blade B 4 is a cutting blade that does not have both corners of the upper blade so that when the fin is cut to length in the later process, uncut parts 7 are formed at both ends of the width cutting line B. For the first and last cuts from the length cutting position, the engagement depth of the width cutting blade 134 is made shallow, and for other than the above width cutting, the engagement depth of the width cutting blade 134 is deepened to leave an edge. A cutting line 6 having a certain width can be formed with an arbitrary fin length.

The engagement depth of the width cutting blade 134 can be controlled by operating a cylinder or the like built into the two plates of the width cutting unit. Note that the uncut portions 7 may be provided on both sides of the edge remaining width cutting line 6, or may be provided only on one side.

In this embodiment, the manufacturing method of the set fin 9 is described in which five two-row heat exchangers are manufactured by lining up five pieces in the width direction at the same time, but the mounting position of the width cutting blade A3 and the width cutting blade B4 is changed. Accordingly, six single-row heat exchangers or two five-row heat exchangers can be manufactured at the same time.

The number of rows of collective fins may be any number, but for example, in the second embodiment,
If we use a 12-row assembly fin that has double the number of rows, it will become a flexible assembly fin that can accommodate four types of heat exchangers with 1 to 4 rows.

The fins formed with the continuous width cutting line 5 and the edge remaining width cutting line 6 in this way are not bent compared to the conventional fins that are cut to the required width from the beginning, so the length cutting blade 8 is used to cut the fins to the desired length. It becomes easy to stack a large number of fins one after another on the stacking bar 10 without having to cut them into pieces. To stack the fins, the fins protruding from the length cutting cutting blade 8 are adsorbed to the fin suction machine by the 7-year suction unit and the desired fin length is obtained. After cutting the fin with the length cutting cutting blade 8, the fin suction plate is pushed while the fin is suctioned, and the fin is forcibly inserted into the stacking par 10, which has a diameter slightly smaller than the pipe insertion hole 2 of the fin. The heat exchanger for a general room air conditioner has an outer diameter of 9.6r.
rrm stacking par 10 with inner diameter 9.9-9, 95
When fins having pipe insertion holes 2 of rrrm are stacked, the pipe insertion holes 2 of the stacked fins 9 are stacked.
IJ-shaped pipe 1 with an outer diameter of 252 mm
4 can be easily and automatically inserted.

In addition, a second
After forming a short cutting line perpendicular to the width cutting line 6 as shown in the figure, or forming a round hole etc. as shown in Fig. 6, after assembling the collective heat exchanger 13 as shown in Fig. 4, When manufacturing a plurality of heat exchangers by cutting the uncut portion 7 of the fin, even if the cutting position y1° of the uncut portion 7 is slightly misaligned with the end width cutting line 6, the heat exchanger cannot be cut. Separation is possible.

After inserting a large number of 0-shaped pipes 14 with the collecting fins 9 stacked on the stacking par 10 in this way, remove the fins 9 from the bar 10 and insert the 0-shaped pipes 14 into the parts that could not be inserted with the bar 9. Insert.

After expanding the tube of the collective heat exchanger 15 in which the fins and pipes are assembled, and then cleaning the heat exchanger 16 using a known cleaning method, the uncut portions 7 of the fins are cleaned using a cutter knife, laser, water jet, etc. Cut the heat exchanger using a cutting machine and separately manufacture multiple heat exchangers.

As described above, the present invention involves assembling a collective heat exchanger consisting of multiple heat exchangers, and then cutting and separating a part of the fins to produce a plurality of heat exchangers. This is a highly flexible method for manufacturing heat exchangers that can accommodate diversifying specifications, and has great industrial value.

〔Effect of the invention〕

According to the present invention, productivity is high because a plurality of heat exchangers are processed together as a collective heat exchanger, and since the heat exchangers are assembled into collective fins, a production facility with lookability without restrictions on the number of heat exchanger rows can be created.

Since the fins are assembled together, there is no bending of the fins after width cutting, allowing for extremely stable fin stacking.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating the process of forming a set of fins;
Figure 2 is a perspective view of a set of fins with cut lines perpendicular to both ends of the cut line for width left on the edge, and Figure 6 is a perspective view of a set of fins with round small holes cut at both ends of the cut line for width left on the edge. , FIG. 4 is a perspective view of the collective heat exchanger. 1... Aluminum thin plate, 2... Pipe insertion hole, 3...
Width cutting cutting blade A14... Width cutting cutting blade B, 5... Continuous width cutting line, 6... End leaving width cutting line, 7... Uncut portion,
8...Length cutting cutting blade, 9...Collecting fin, 10...
・Stacking bar, 11... Cutting line, 12... Round small hole, 13... Collective heat exchanger, 14... U-shaped pipe. Attorney: Susuki 1) Tori -i*, Hitachi, Ltd., Tochigi Factory, 800 Oaza Tomita, Ohira-cho, Shimoga-gun, Tochigi Prefecture Inventor: Masahiro Miyagi Hitachi, Ltd., 800 Oaza Tomita, Ohira-cho, Shimoga-gun, Tochigi Prefecture Inside Tochigi factory

Claims (1)

[Scope of Claims] 1. In a heat exchanger that combines a large number of plate-like fins and heat exchanger pipes, a unit for forming pipe insertion holes of the fins and an initial number of the above heat exchangers are assembled. A width cutting unit that forms a continuous width cutting line and an end width cutting line to produce a set of fins, a control device that appropriately operates the width cutting unit, a fin feeding unit that feeds the fins, and a fin feeding unit that feeds the fins, and There is a length cutting unit that cuts the fins to length, a fin stacking unit that stacks up the fins cut to length, and a 0-shaped pipe that is inserted through the stacked fins and then the vibrator is expanded to form a collective heat exchanger. A method for manufacturing a heat exchanger, comprising a tube expansion unit and a fin cutting unit for cutting and separating uncut portions of fins of a collective heat exchanger to form a plurality of heat exchangers. 2. The method of manufacturing a heat exchanger according to claim 1, wherein a small hole punching unit is provided to form small holes such as round or square holes at both ends of the end remaining width cutting line of the collective fin. 6. Cutting to form short cutting lines perpendicular to the width cutting line at both ends of the edge remaining width cutting line of the collective fin; L knit is provided in the exchanger according to claim 1. production method.