JPH0367455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing a cross-fin type heat exchanger used, for example, in an evaporator for a car cooler.

BACKGROUND TECHNOLOGY In general, this type of heat exchanger includes parallel plate fins having pipe insertion holes, pipes bent into a so-called hairpin shape, and U-shaped connecting pipes.
The heat exchanger is composed of front and rear plates, but conventionally there has been a problem in that manufacturing the heat exchanger is time-consuming and cannot be automated. In other words, conventionally, when manufacturing a heat exchanger, first the required number of plates and fins were held in parallel, side plates were placed on both sides of the plate and fin groups, and the side plates and plate and fin groups were The straight pipe portions on both sides of the hairpin-shaped pipe were inserted into the pipe insertion hole, and then expanded using a mandrel to secure the pipe, the plate/fin group, and the side plate. In this case, the insertion of the straight pipe sections on both sides of the hairpin pipe is usually done manually, and the insertion of these straight pipe sections is performed in a separate process from the pipe expansion work using a mandrel. ,
In the end, there was a problem in that it took time and effort to manufacture the heat exchanger. Moreover, because complex circuit designs are used to improve the performance of heat exchangers, when manually inserting hairpin pipes, it is possible to insert them in the wrong direction, or the straight pipes on both sides may have different pitches, i.e., bending radii. There was a problem in that hairpin-shaped pipes with different sizes could be used by mistake, which hindered automation.

Purpose of the Invention The purpose of the present invention is to solve the above-mentioned problems, and to provide a heat exchanger that can continuously and automatically perform the work of inserting a pipe into the pipe insertion hole of the plate fin and the work of expanding the pipe. An object of the present invention is to provide a method for manufacturing a heat exchanger that can be manufactured extremely efficiently and inexpensively, and can also reduce the weight of the heat exchanger.

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a system having at least one vertical row of pipe insertion holes spaced apart from each other at intervals equal to or multiple times the outer diameter of the pipe. a plate/fin standing means for holding several plates/fins in parallel; a pipe stacking means having pipe holding members arranged at intervals approximately equal to the outer diameter of the pipe; and a pipe stacking means having a large diameter part for pipe expansion at the tip. A pipe pushing/expanding device having a mandrel that can move forward and backward in correspondence with the pipe insertion hole of the plate/fin is arranged in this order, and a stopper for receiving the front end of the pipe is provided on the front side of the plate/fin upright means. - Arrange the plates and hold the required number of plates and fins in parallel in the plate and fin upright means, and hold a large number of pipes in a stacked state in the pipe accommodating section of the pipe stacking means, and Excess pipes are stacked above, and in this state, the mandrel of the pipe pushing/expanding device is advanced, and the large diameter part at the tip of each mandrel is pressed against the rear end of the corresponding pipe, and the pipe is inserted into the plate.・By pushing the mandrel into the pipe insertion hole of the fin group and hitting the tip of the pipe against the stopper plate, and then moving the mandrel forward, the large diameter part of the mandrel is forced into the pipe and the diameter of the pipe is reduced. Expand and connect the pipe to the plate fin,
By then retracting the mandrel, the excess pipes fall down from above in a stacked state, forming a stacked pipe group that corresponds to the row of pipe insertion holes in the next plate/fin group. The gist of this paper is a method for manufacturing a cross-fin type heat exchanger.

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

1 to 4, the method of the present invention includes:
First, the required number of plates and fins 2 having four vertical rows of pipe insertion holes 3 spaced apart by an interval P equal to the outer diameter D of the pipe 1, as well as the front and rear outer side plates 5 are held in parallel. The plate/fin upright means 8, the pipe holding members 9 arranged at intervals approximately equal to the outer diameter D of the pipe 1, and the bottom part of the plate-like pipe accommodating part 10 between the holding members 9, and the lowest part. A block-shaped pipe positioning member 11 that aligns the pipe 1 with the level of the lowest pipe insertion hole 3 (that is, aligns the center)
a pipe stacking means 12 having a pipe stacking means 12; a pipe pushing and expanding device device 6 having a mandrel 4 having a large diameter part 4a for pipe expansion at the tip and movable back and forth corresponding to the pipe insertion hole 3 of the plate fin 2; In addition to arranging them in this order, a stopper plate 7 for receiving the front end of the pipe 1 is arranged in front of the plate/fin upright means 8.

The plate fin 2 is provided with four rows of pipe insertion holes 3 arranged in a staggered manner when viewed from the front. Further, the plate/fin upright means 8 has concave grooves 14 arranged in parallel on the upper surface of the substrate 13 into which the lower edges of the plate/fin 2 and side plate 5 are fitted.

A front guide plate 16 having a pipe insertion hole 15 is provided on the front side of the pipe stacking means 12, and a rear guide plate 18 having a mandrel passage hole 17 is provided on the rear side thereof. Further, in the four pipe accommodating portions 10 formed between the five plate-shaped pipe stacking means 12, high positioning means 4A and low positioning means 4b are arranged alternately, so that the pipes 1 in each row are placed on the plate. - It is designed to be visible through the staggered pipe insertion holes 3 of the fins 2.

The pipe pushing/expanding device 6 is L when viewed from the side where the required number of mandrels 4 are installed horizontally.
a driving cylinder 22 having a piston rod 21 whose tip end is connected to the sliding body 20;
A vertical mandrel support plate 24 having a mandrel insertion hole 23 at a location near the pipe stacking means 12 is provided.

Also, the stopper plate 7 has a mandrel 4.
A recess 2 for letting the tip of the large-diameter tube expansion portion 4a escape.
8 is provided.

Then, the required number of plate/fins 2 and front and rear side plates 5 are held in parallel on the plate/fin upright means 8, and the pipe stacking means 1
A large number of pipes 1 are held in a stacked state in the pipe storage section 10 of No. 2, and surplus pipes 1 are stacked above the group of these pipes, and in this state, the drive cylinder 22 of the pipe pushing/expanding device 6 is operated. By advancing the mandrel 4 by
As shown in FIG. 5, the large diameter portion 4a at the tip of each mandrel 4 is pressed against the rear end of the corresponding pipe 1, and the pipe 1 is inserted into the pipe insertion hole 3 of the 2 groups of plates/fins and the side plate 5. Push in, pipe 1
By abutting the tip of the mandrel 4 against the stopper plate 7 and further advancing the mandrel 4, the large diameter portion 4a of the mandrel 4 is forced into the pipe 1, as shown in FIG. is enlarged to connect the pipe 1 to the plate fin 2 and side plate 5. Thereafter, by retreating the mandrel 4, the excess pipes 1 fall down from above in a stacked state, forming a group of stacked pipes corresponding to the rows of pipe insertion holes 3 of the next group of plates and fins. be.

Therefore, once a new plate/fin 2 is set, the next pipe insertion and pipe expansion process can be carried out immediately.

Note that the ends of the pipes 1 to be connected to each other are, for example, U-shaped connecting pipes 25 as shown in FIG.
Alternatively, as shown in FIG. 8, a cover plate 26 having a recess may be used.
is fitted onto the end of the pipe 1 and bonded to the side plate 5 with brazing or adhesive to form the connecting portion 27.
The communication may be established by forming a .

In the above embodiment, four pipe insertion holes 3 are provided in the plate fin 2 in a staggered arrangement, but this need not necessarily be in a staggered arrangement, and the pipe insertion holes 3 are provided at least in a staggered manner. It is sufficient if one row is provided. Furthermore, an interval P equal to the outer diameter D of the pipe 1 is provided between the vertically adjacent pipe insertion holes 3 in each row; however, the interval P is not limited to this and is multiple times the outer diameter D of the pipe 1. may be left open. In addition, the pipe insertion holes 3 adjacent to the left and right
The interval H between the rows of pipes 1 and 2 is arbitrary.
It is preferable that the diameter is 1.2 times or more the outer diameter D of. In addition, there are usually side plates 5 on both front and rear sides of the 2nd group of plates and fins.
are placed, but these may be omitted in some cases. Further, a pipe positioning member 11 is provided at the bottom of the pipe accommodating portion 10, but depending on the arrangement of the pipe insertion hole 3 of the plate fin 2 and the arrangement relationship between the plate fin 2 and the pipe 1, such a pipe positioning member 11 may be It is also possible to align the pipe 1 and the pipe insertion hole 3 without using the positioning member 11.

Heat exchangers manufactured by the method of this invention include evaporators and condensers for car coolers,
It can be used in evaporators and condensers for room coolers, evaporators and condensers for vending machines, etc.

Effects of the Invention As described above, the method for manufacturing a cross-fin type heat exchanger according to the present invention is characterized in that at least one of the vertically spaced 1 row of pipe insertion holes 3
plate/fin standing means 8 for holding a required number of plate/fins 2 in parallel, and pipe stacking means 12 having pipe holding coating materials 9 arranged at intervals approximately equal to the outer diameter D of the pipe 1;
and a pipe pushing/expanding device 6 equipped with a mandrel 4 having a large-diameter pipe expanding portion 4a at its tip and movable back and forth corresponding to the pipe insertion hole 3 of the plate fin 2, are arranged in this order, and A stopper plate 7 for receiving the front end of the pipe 1 is disposed on the front side of the plate/fin upright means 8,
While holding the required number of plates and fins 2 in parallel on the plate and fins upright means 8,
A large number of pipes 1 are held in a stacked state in the pipe accommodating portion 10 of the pipe stacking means 12, and surplus pipes 1 are stacked above the group of these pipes 1, and in this state, the mandrel 4 of the pipe pushing and expanding device 6 is By advancing the large diameter portion 4a at the tip of each mandrel 4, the corresponding pipe 1
The mandrel 4 is pressed against the rear end, the pipe 1 is pushed into the pipe insertion hole 3 of the plate fin 2 group, the tip of the pipe 1 is butted against the stopper plate 7, and the mandrel 4 is moved forward. The large-diameter portion 4a of the pipe 1 is forcibly pushed into the pipe 1 to enlarge the diameter of the pipe 1, and the pipe 1 is coupled to the plate fin 2, and then the mandrel 4 is moved back, thereby removing the excess pipe 1.
The pipes fall from above in a stacked state to form the first group of stacked pipes corresponding to the row of pipe insertion holes 3 in the next second group of plates and fins. The work of inserting the pipe 1 into the tube 3 and the work of expanding the pipe 1 can be performed continuously and automatically by the mandrel 4 having the large diameter part 4a for pipe expansion, and the manufacture of the heat exchanger can be carried out extremely efficiently. can do. Moreover, the apparatus 6 having the mandrel 4 is one
A pipe stacking means 12 is used on the front side of the stand.
Since it is only necessary to arrange the plate/fin raising means 8 and the stopper plate 7, the equipment cost is very low. In addition, since the conventional hairpin-shaped pipe requires strength at the bent portion, it was necessary to use a pipe with a wall thickness of 0.6 to 0.7 mm, but according to the method of the present invention, the pipe 1 has a straight pipe shape. Therefore, it is sufficient to use pipes with a wall thickness of 0.3 to 0.4 mm, which means that less material is required for the pipe 1, and the weight of the heat exchanger can be reduced.
The material cost of the pipe 1 is low, and together with the above-mentioned low equipment cost, the manufacturing cost of the heat exchanger can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of an apparatus for carrying out the method of the present invention, FIG. 2 is an enlarged sectional view taken along the line of FIG. 1, and FIG. 3 is an enlarged sectional view taken along the line of FIG. Figure 4 is an enlarged sectional view taken along the line in Figure 1, Figure 5 is an enlarged partially cutaway side view of the main part showing the rear end of the pipe being pushed by the large-diameter part of the mandrel, and Figure 6 is an enlarged partially cutaway side view of the pipe. FIG. 7 is an enlarged sectional view showing a specific example of a pipe connecting portion of a heat exchanger; FIG. 8 is an enlarged sectional view showing another specific example of the pipe connecting portion of the heat exchanger. be. 1...pipe, 2...plate/fin, 3...
... Pipe insertion hole, 4 ... Mandrel, 4a ... Large diameter part for pipe expansion, 5 ... Side plate, 6 ... Pipe pushing and expanding device, 7 ... Stopper plate, 8 ... Plate fin raising means, 9 ... Pipe holding member, 12 ... Pipe stacking means, D ... Outer diameter of pipe.

Claims (1)

[Claims] 1 A required number of plate fins 2 having at least one row of vertical pipe insertion holes 3 spaced apart from each other at intervals P equal to the outer diameter D of the pipe 1 or multiple times the outer diameter D are arranged in parallel. A holding plate/fin standing means 8 and a pipe holding member 9 arranged at an interval approximately equal to the outer diameter D of the pipe 1.
This includes a pipe stacking means 12 having a pipe stacking means 12, and a pipe pushing/expanding device 6 having a mandrel 4 having a large diameter part 4a for pipe expansion at the tip and moving forward and backward corresponding to the pipe insertion hole 3 of the plate fin 2. At the same time, a stopper plate 7 for receiving the front end of the pipe 1 is arranged on the front side of the plate/fin upright means 8, and the required number of plates/fins 2 are held in parallel on the plate/fin upright means 8. At the same time, a large number of pipes 1 are held in a stacked state in the pipe accommodating portion 10 of the pipe stacking means 12, and surplus pipes 1 are stacked above the group of these pipes, and in this state, the pipe pushing/expanding device 6 By moving the mandrels 4 forward, the large diameter portion 4 at the tip of each mandrel 4 is
Press a to the rear end of the corresponding pipe 1,
Push the pipe 1 into the pipe insertion hole 3 of the second group of plate fins, abut the tip of the pipe 1 against the stopper plate 7, and then insert the mandrel 4.
By moving the mandrel 4 forward, the large diameter part 4a of the mandrel 4 is forcibly pushed into the pipe 1 to enlarge the diameter of the pipe 1, and the pipe 1 is connected to the plate fin 2, and then the mandrel 4 is moved back. Accordingly, the surplus pipes 1 fall from above in a stacked state to form a stacked group of pipes corresponding to the row of pipe insertion holes 3 of the next two groups of plates and fins. Manufacturing method of cross-fin type heat exchanger.