JPH09192766A - Method and device for manufacturing heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and strongly hold a tube positioning on the inside in the same way as a tube positioning on the outside, further to hold the tube without deforming the tube port part side and the expanded part of the tube, and to minimize the shrinkage of a hair pin tube at the time of expanding even when respective hair pin tubes inserted through a heat exchanger are arranged in plural rows, also even when the diameter of the tube to be expanded has been changed. SOLUTION: After forming an expanded part with prescribed length by holding the hair pin part 7c of a hair pin tube 7 with a holding means and after that, by force-fitting a mandrel 2 for expanding in a prescribed dimension from the tube port part 7b of the hair pin tube, the peripheral surface part of the expanded part is held in the direction crossing the tube length direction to form gaps in a prescribed quantity among respective tube abutting members by a holding body 3 with plural tube abutting members 3f radially freely expandable and contractable. After that, by advancing the mandrel for expanding to the hair pin part side to expand the hair pin tube, and a heat exchanger 5 is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention expands a hairpin tube or a straight tube inserted through each through hole of a plurality of polymerized radiation fins, even if the hairpin tube or the straight tube is integrally formed with the radiation fins. The present invention relates to a heat exchanger manufacturing method and apparatus capable of keeping the total length of a hairpin tube or a straight tube substantially the same as before expansion.

[0002]

2. Description of the Related Art Conventionally, for example, a method of manufacturing a heat exchanger capable of keeping the total length of a hairpin tube to be expanded of this kind substantially equal to that before expansion is disclosed in Japanese Patent Application Laid-Open No. 63-188433. There is something.

That is, as described in the above publication, as shown in FIG. 6, a large number of heat radiation fins 6 superposed at predetermined intervals are superposed.
Then, the mandrel 2 for expanding the tube is inserted from the tube opening portion 7b of the hairpin tube 7 of the heat exchanger 5 configured by inserting the plurality of hairpin tubes 7, and the hairpin tube 7 and the radiation fin 6 are fixed. In the method, the hairpin portion 7c of the hairpin tube 7 is fixed by a hook body 10 that does not move to the tube mouth portion 7b,
In this state, the mandrel 2 for expanding the pipe is inserted from the mouth opening portion 7b of the hairpin tube 7, and the heat radiating fin 6 on the one end side is farther than the mouth opening portion.
At the stage of expanding the 7b side, the expanded tube portion 7d is fixed in the through hole 9 of the clamp 8 which does not move to the hairpin portion 7c,
When inserting the mandrel 2 for expanding the tube into the hairpin tube 7 thereafter, the fixing portion of the hairpin tube 7 by the clamp body 8 is restrained without moving to the hairpin portion 7c side, and the fixing portion of the hairpin tube 7 by the hook body 10 is piped. This is a method of performing the operation in a restrained state without moving to the mouth portion 7b.

According to the above method, the hairpin tube 7 of the hairpin tube 7 on the tube opening 7b side with respect to the radiation fin 6 is fixed in the through hole 9 of the clamp body 8, and this fixed portion is moved to the hairpin portion 7c side. After being restrained, the hairpin tube 7 tends to contract when the tube is expanded through insertion of the mandrel 2 for expansion, but since the hairpin portion 7c is also restrained by the hook body 10, the contraction of the hairpin tube 7 does not occur. It is blocked and absorbed by the reduced thickness of the hairpin tube 7,
As a result, there is an advantage that shrinkage of the entire length of the pipe after expansion can be minimized.

[0005]

However, the method for manufacturing a heat exchanger according to the above method has the following problems.

That is, according to the above method, as shown in FIG. 5B, the opening 7b of the hairpin tube 7 is fixed in the through hole 9 of the clamp 8, and the hairpin portion 7c of the hairpin tube 7 is hooked. When the number of hairpin tubes 7 inserted in the heat radiation fins 6 in a zigzag manner is three rows, four rows, and a plurality of rows, for example, the hairpin tubes located inside 7 cannot be fixed by the clamp 8.

As shown in FIG. 1C, the above problem can be solved by mechanically changing the diameter of the through hole 9 of the clamp 8 by a drawing mechanism. Becomes extremely narrow, it cannot be used at all because of the space of the aperture mechanism, and in any case, there is a limit.

Further, when the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the tube changes depending on the type of the specifications of the heat exchanger 5, the through hole 9 of the clamp 8 no longer causes a certain problem of the hairpin tube 7. Not only can you not fix the mouth 7b side,
As shown in (d) of the figure, the hairpin portion 7c through the hook body 10
Even if the hook body 10 itself is not replaced with one having a shape matching the arc shape substantially the same as the inner circumference of the hairpin portion 7c, the inner circumference portion of the hairpin portion 7c is contracted due to the contraction of the hairpin tube 7 that occurs during tube expansion. There were various very serious problems that the steel easily deformed.

That is, according to the present invention, even when the hairpin tubes inserted in the heat radiation fins of the heat exchanger in a zigzag form are arranged in a plurality of rows of three rows or four rows so as to be close to each other,
Not only can the hairpin tube located on the inner side be securely and firmly held in the same manner as the hairpin tube located on the outer side, but the diameter of the hairpin tube of the heat exchanger for expanding the tube Even if it changes depending on the type of specifications,
Not only can the tube mouth side of the hairpin tube be securely and firmly fixed, but the hairpin section must also be replaced with a hook body that has a shape that matches the arcuate shape of the inner circumference of the hairpin section. It does not require any hassle such as having to do it, and it can hold the hairpin part without deforming it instantly and minimize the shrinkage of the hairpin tube. Even if the pipes are inserted, or even if the straight pipes are inserted close to each other in a zigzag manner, it is possible to minimize the total length shrinkage of the straight pipe after expansion. Another object of the present invention is to provide a heat exchanger manufacturing method and apparatus.

[0010]

In order to solve the above-mentioned various problems, the present invention invents an entirely new method and apparatus for manufacturing a heat exchanger, and takes the following means.

That is, according to the present invention, the hairpin portion 7c of the hairpin tube 7 is held by at least a pair of holding bodies 4a to hold the hairpin tube 7, and then the tube mandrel 2 is expanded from the tube mouth portion 7b of the hairpin tube 7. By press-fitting with a predetermined size to form an expanded portion 7d of a predetermined length, and thereafter, the peripheral surface portion 7e of the expanded portion 7d is expanded from the tube mouth portion 7b side of the hairpin tube 7 to a plurality of expandable and contractible tube contact members 3f. The gripping body 3 having the above-mentioned structure holds the pipe abutting members 3f so that a predetermined amount of gap 3a is formed between the pipe abutting members 3f, and then the pipe expanding mandrel 2 is advanced to the hairpin portion 7c side to move the hairpin pipe 7a. To expand.

Therefore, for example, the radiation fins 6 of the heat exchanger
Even when each hairpin tube 7 inserted in the above is configured in a predetermined pattern so as to form a plurality of rows such as three rows and four rows in a zigzag manner so that the distances between them become extremely close to each other, surely, Further, not only can the hairpin tube 7 firmly located on the inner side be held in the same manner as the hairpin tube 7 located on the outer side, but the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the heat can be changed. Even if it changes depending on the type of the container 5, the hairpin tube 7 can be securely and firmly fixed to the mouth opening portion 7b side, and the hairpin portion 7c also has an inner circumference of the hairpin portion 7c. With the advantage that it can be securely held by the holding body 4a without being deformed without any troublesomeness such as having to replace the hook body with a shape that fits substantially the same arc shape. Have.

Further, according to the present invention, the tube main body 7a in the vicinity of the hairpin portion 7c of the hairpin tube 7 is held by the holding means, and then the pipe expanding mandrel 2 is press-fitted from the tube mouth portion 7b of the hairpin tube 7 with a predetermined size. The gripping body 3 having a plurality of expandable / contractible tube contact members 3f that form the expanded portion 7d of a predetermined length and then advance the peripheral surface portion 7e of the expanded portion 7d from the tube mouth portion 7b side of the hairpin tube 7
The hairpin tube 7 is held by holding the hairpin portion 7c of the hairpin tube 7 with at least a pair of nipping bodies 4a. After that, the holding means is released, and then the tube expanding mandrel 2 is advanced to the hairpin portion 7c side to expand the hairpin tube 7.

Therefore, for example, the hairpin portion 7c of the hairpin tube 7 is projected with a step so that the hairpin portion 7c cannot be easily and instantaneously clamped by the pair of clamping bodies 4a, or an irregular insertion pattern. In the case of the above, the hairpin tube 7 can be temporarily held by the tube expanding device by the holding means until the hairpin portion 7c is reliably held, and the distance between them is extremely close. Therefore, not only can all of the hairpin tubes 7 inserted in a plurality of rows be held securely, but the diameter of the hairpin tubes 7 of the heat exchanger 5 for expanding the pipes varies depending on the type of the heat exchanger 5 specifications. Even if it is, the tube mouth portion 7b side of the hairpin tube 7 can be securely and firmly fixed, and the hairpin portion 7c also has an arc shape substantially the same as the inner circumference of the hairpin portion 7c. It must be replaced with a hook-shaped body Hassle such no Banara also surely not require any, and clamping member without deformation
It has an advantage that it can be held by being sandwiched by 4a.

Further, according to the present invention, at least a pair of tube main bodies 7a in the vicinity of the hairpin portion 7c of the hairpin tube 7 inserted into the heat radiation fins 6 having a predetermined length and inserted into a plurality of heat radiating fins 6 having a predetermined interval. The hairpin tube 7 is held by being sandwiched by the holding body 4a, and then the tube expanding mandrel 2 is press-fitted from the tube opening portion 7b of the hairpin tube 7 in a predetermined size to form a tube portion 7d having a predetermined length, and then the tube portion is expanded. A gripping body 3 having a plurality of expandable and contractible tube abutting members 3f for advancing the peripheral surface portion 7e of 7d from the tube mouth portion 7b side of the hairpin tube 7 is provided with a predetermined amount of gap 3a between the respective tube abutting members 3f. To form a pipe, and then the pipe expanding mandrel 2
Is expanded to the hairpin portion 7c side to expand the hairpin tube 7.

Therefore, for example, when the hairpin portion 7c of the hairpin tube 7 is projected with an insertion pattern or the like that cannot be held by being held by the pair of holding bodies 4a, the hairpin portion of the hairpin tube 7 is formed. (7c) near the main body (7a) of the hairpin
Not only can it be securely held by changing to (7c), but even if the diameter of the hairpin tube 7 of the heat exchanger 5 that expands the tube changes depending on the type of the heat exchanger 5 specification, In addition, it is possible to firmly fix the tube mouth portion 7b side of the hairpin tube 7, and further replace the hairpin portion 7c with a hook body having a shape that matches the arc shape substantially the same as the inner circumference of the hairpin portion 7c. It has an advantage that it can be securely held by the holding body 4a without being deformed and without requiring any troublesomeness.

Further, according to the present invention, one end side 7h of the straight pipe 7i, which is inserted to have a predetermined length and is inserted into a plurality of radiating fins 6 which are superposed at a predetermined interval, is held by at least a pair of holding bodies 4a. Then, the straight pipe 7i is held, and then the pipe expanding mandrel 2 is press-fitted with a predetermined size from the pipe opening 7b on the other end opposite to the one end side 7h to form a pipe expanding portion 7d having a predetermined length. The gripping body 3 having a plurality of expandable and contractible pipe abutting members 3f for advancing the peripheral surface portion 7e of the portion 7d from the other end side of the pipe mouth portion 7b has a predetermined gap between the pipe abutting members 3f. Grasp to form 3a,
After that, the pipe expanding mandrel 2 is advanced to the one end side 7h to expand the straight pipe 7i.

Therefore, even when the heat exchanger 5 for expanding the pipe does not have the hairpin portion 7c, the one end side 7h of the straight pipe 7i is securely and firmly clamped and held by the clamp body 4a. It has the advantage of being able to.

Further, according to the present invention, the holding body 4a is moved in the same direction as the pipe expanding mandrel 2 which is advanced so that the pipe expanding portion 7d is press-fitted into the hairpin pipe 7 or the straight pipe 7i held by the holding body 3. Since the hairpin tube 7 or the straight tube 7i is moved and a tensile force is applied to the hairpin tube 7 or the straight tube 7i, there is an advantage that the shrinkage of the entire length of the tube at the time of tube expansion can be minimized.

Further, according to the present invention, the peripheral surface portion 7e of the expanded pipe portion 7d is grasped by the pipe contact members 3f of the grasping body 3 so that a predetermined amount of gap 3a is formed between the pipe contact members 3f. Before, since the pressure receiving member 13 corresponding to the pipe contact member 3f enters the pipe expanding portion 7d, the peripheral surface portion 7e of the pipe expanding portion 7d can be firmly held between the outer peripheral surface side and the inner peripheral surface side. Not only is it possible, but also the peripheral surface portion 7e of the pipe expanding portion 7d when gripping the pipe expanding portion 7d via the pipe contact member 3f.
There is an advantage that the deformation of the pipe in the direction of the inside of the pipe can be surely prevented.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> A first embodiment of a manufacturing apparatus used in the method for manufacturing a heat exchanger according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a heat exchanger manufacturing apparatus, and 1a is an apparatus main body provided on a base 1b.

1c is a heat exchanger 5 installed upright on the base 1b
The heat exchanger 5 has a plurality of superposed radiating fins 6 and a plurality of hairpin tubes 7 of a predetermined length inserted in a row (not shown) in a direction along the surface of the mounting table 1c. Have been
Moreover, a pressing plate 11 for pressing and fixing the heat exchanger 5 between the mounting table 1c and the mounting table 1c is provided above the mounting table 1c so as to be able to move up and down.

Reference numeral 2 denotes a pipe expanding mandrel provided on the apparatus main body 1a in a substantially horizontal state and reciprocally movable. The pipe expanding mandrel 2 has an outer periphery as shown in FIG. A grip having a plurality of pipe abutting members 3f which are formed to have an inclined surface 3b which is directed upward toward the tip end of the pipe expanding mandrel 2 and which is radially expandable and contractible in a direction intersecting the longitudinal direction of the hairpin pipe 7. The body 3 is reciprocally fitted to the outside, and the holding body guide cylinder 3c provided on the reciprocating plate body 3d slides on the holding body 3 through a cylinder (not shown). It can be freely fitted.

Each of the tube abutting members 3f of the gripping body 3 should surround the outer periphery of the mandrel 2 along the longitudinal direction of the mandrel 2 for expanding the pipe, as shown in FIG. Four
Provided, and between the respective tube contact members 3f, each of the tube contact members 3f was brought into close contact with the outer peripheral surface of the mandrel 2 by the advancing of the grasping body guide tube 3c to make contact therewith. In this case, a predetermined amount of gap 3a is formed at four places, so that it has a so-called collet chuck function. In addition, the gripping body 3 having the plurality of pipe contact members 3f is connected to each of the hairpins inserted through the heat exchanger 5. A plurality (not shown) is provided in the direction along the surface of the mounting table 1c so as to face the tube opening 7b of the tube 7.

Numeral 4 is a pair of grips provided on the base 1b and rotatably rotatably supported to grip the hairpin portion 7c of the hairpin tube 7 inserted into the heat radiation fins 6 of the heat exchanger 5. Body 4a and drive cylinder 4e driven by the holding body 4a
A base table 4d provided with the drive cylinder 4e and a pair of holding bodies 4a; a guide rail 12 capable of sliding the base table 4d in opposition to the mounting table 1c; and a reciprocatingly movable base table 4d. And a pair of reciprocating cylinders 4f. The pair of holding members 4a are arranged so as to face the hairpin portions 7c of the hairpin tubes 7 inserted into the radiation fins 6 of the heat exchanger 5. A plurality of rows (not shown) are provided in the direction along the surface of the mounting table 1c.

The heat exchanger manufacturing apparatus according to the first embodiment of the present invention has the above-described structure. Next, description will be made regarding a case where a pipe expanding mandrel is press-fitted into the hairpin tube of the heat exchanger using such an apparatus. .

First, as shown in FIG. 1, the heat exchanger 5 is mounted on the mounting table 1c described above, and then the pressing plate positioned above is mounted.
11 is lowered to press and fix the heat exchanger 5 with the mounting table 1c.

Next, the hairpin portion 7c of the hairpin tube 7 of the heat exchanger 5 is actuated by the reciprocating cylinder 4f of the gripper moving device 4 to advance the base 4d along the guide rail 12 (not shown). At the same time, the driving cylinder 4e is driven to sandwich the hairpin portions 7c of the hairpin tubes 7 by the pair of holding bodies 4a, respectively. At this time, the pair of holding bodies 4a are held. Tongue-shaped concave portions 4g are provided facing each other on the inner surface portions facing each other so that the hairpin portion 7c can be firmly and closely held.

Next, as shown in FIG. 2C, the pipe expanding mandrels 2 are pressed into the hair opening pipes 7b of the hairpin pipes 7 by a predetermined distance to form a pipe expanding portion 7d having a predetermined length. Thereafter, the peripheral surface portion 7e of the expanded tube portion 7d is advanced from the tube mouth portion 7b side of the hairpin tube 7 by advancing (indicated by arrow B) the four expandable and contractible tube contact members 3f of the grip body 3. Outfit to surround 7e.

After that, when the gripping body guide cylinder 3c externally fitted to the four tube abutting members 3f is advanced in the same direction as the forward direction of the tube expanding mandrel 2 (arrow C), the gripping body guide cylinder is shown. 3c
Presses the upwardly inclined surface 3b of each pipe contact member 3f to contract each of the pipe contact members 3f in the axial direction of the pipe expanding mandrel 2, and each pipe contact member 3f The peripheral surface portion 7e of the pipe expanding portion 7d of the hairpin tube 7 is firmly gripped with a predetermined gap 3a between the respective pipe contact members 3f, and in this state, the pipe expanding mandrel 2 is again held. While moving forward to the hairpin portion 7c side of the hairpin tube 7, the holding body moving device 4 having the holding body 4a holding the hairpin portion 7c is moved slightly in the same direction as the forward direction of the tube expanding mandrel 2 (backward). ) By applying a tensile force, shrinkage of the hairpin tube 7 in consideration of not only the contraction of the hairpin tube 7 at the time of expansion but also the sliding of the hairpin tube 7 from the tube contact member 3f and the holding body 4a. The advantage is that it is possible to produce a heat exchanger that is kept to a minimum.

Therefore, for example, when the hairpin tubes 7 are inserted in the radiation fins 6 of the heat exchanger 5 in a zigzag shape (not shown), the hairpin tubes 7 inserted in the zigzag shape are spaced apart from each other (insertion). 3 rows or 4 to make the pitch) very close
Even when inserted into a plurality of rows, the hairpin tube 7 located inside the heat exchanger 5 can be reliably and firmly attached to the hairpin tube 7 as well as the hairpin tube 7 located outside. Each of the gripping bodies 3 having a plurality of pipe contact members 3f that advance from the mouth portion 7b direction can be surely individually gripped and fixed.

Therefore, even if the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the tube changes depending on the type of specifications of the heat exchanger 5, for example, the tube contact member 3f of the grip body 3 Since each of them firmly grips the peripheral surface portion 7e of the expanded portion 7d of the hairpin tube 7 with a predetermined amount of gap 3a between the respective tube contact members 3f, the size of the pipe diameter can be increased or decreased. The gap 3a formed between the tube contact members 3f is automatically adjusted to ensure
In addition to being able to firmly hold the tube mouth portion 7b side of the hairpin tube 7, the hairpin portion 7c can also be replaced with a hook body having a shape that matches the arc shape substantially the same as the inner circumference of the hairpin portion 7c. It is possible to securely hold it without any troublesomeness such as having to do it, and to hold it by tightly holding it in close contact with each other by the tongue-shaped concave portion 4g provided on the holding body 4a without deformation. Even if the total length of the hairpin tube 7 used for the above or the outer diameter of the hairpin tube 7 is changed according to the specifications of the heat exchanger 5, it is possible to apply the desired tube expansion to the heat exchanger without modifying the apparatus itself. There is an advantage that can be done.

<Second Embodiment> In the above embodiment, a tongue-shaped concave portion is provided on each of the facing inner peripheral surfaces of the holding body of the holding body moving device. Three
As shown in (b), a convex surface treatment having a plurality of tops as a slip prevention means for preventing the hairpin portion 7c sandwiched between the inner peripheral surfaces of the sandwiching body facing each other, a rugged unevenness As shown in the surface treatment 4b and the same figure (c), an arc-shaped overhang portion 4c may be provided with a predetermined dimension from the outer circumferential arc surface of the hairpin portion 7c inward of the hairpin portion 7c. May be attached (not shown) to the opposing inner peripheral surfaces of the holding body, and the point is that the hairpin portion 7c can be firmly restrained by providing the holding body with an anti-slip means.

<Third Embodiment> Further, in the above embodiment, four tube abutting members 3f of the grip body 3 are provided along the longitudinal direction of the pipe expanding mandrel so as to surround the outer periphery of the mandrel. A gap of a predetermined amount is provided between the respective pipe contact members 3f when the gripping body guide cylinders 3c move forward to bring the pipe contact members 3f into close contact with the outer peripheral surface of the mandrel 2. 3a is formed in four places, for example, as shown in FIG.
As shown in (d), by pressing the peripheral surface portion 7e of the gripped expanded portion 7d to a position where each of the tube contact members 3f is in contact with the expanded portion 7d of the hairpin tube 7, the hairpin tube 7 is pressed. Inner circumference of pipe
A projection 3e forming a bulging portion 7g for locking may be protruded from 7f, and in this case, the peripheral surface of the expanded portion 7d is more firmly provided.
By gripping the pipe 7e, the reference position of the pipe opening 7b at the time of pipe expansion can be reliably set, and there is an advantage that pipe expansion work with higher accuracy can be performed.

<Fourth Embodiment> Further, in the above embodiment, the holding body holds the hairpin portion of the hairpin tube. For example, in the heat exchanger 5, the tube body 7a near the hairpin portion of the hairpin tube is held. The straight pipe portion is held by a holding means (not shown), and then a pipe expanding mandrel is press-fitted from the pipe mouth portion of the hairpin pipe with a predetermined size to form a pipe expanding portion having a predetermined length.
After that, the gripping body 3 having a plurality of expandable and contractible tube abutting members 3f for advancing the peripheral surface of the expanded tube portion from the tube mouth side of the hairpin tube
The holding means is moved in the same direction as the pipe expanding mandrel when the pipe expanding mandrel is advanced toward the hairpin portion side after being gripped so that a predetermined amount of gap is formed between the respective pipe contact members 3f. Alternatively, the hairpin tube may be expanded.

Therefore, in this case, when the hairpin portion 7c of the hairpin tube 7 is projected with an insertion pattern or the like which cannot be held by being held by the pair of holding bodies 4a, the hairpin tube 7 Not only can the tube body (7a) near the hairpin section (7c) be replaced with the hairpin section (7c) to securely hold it, but also the diameter of the hairpin tube 7 of the heat exchanger 5 that expands the tube can be changed. Even if it changes depending on the type of specification of 5,
It is possible to securely and firmly hold the hairpin tube 7 on the tube mouth portion 7b side, and further replace the hairpin portion 7c with a hook body having a shape that is substantially the same as the inner circumference of the hairpin portion 7c. There is an advantage that it can be securely held and held by the holding body 4a without requiring any troublesome work such as being necessary and without being deformed.

<Fifth Embodiment> Further, in the above-described embodiment, the hairpin tube 7 is inserted through the heat exchanger 5, and the hairpin tube 7 is provided with the hairpin portion 7c or the hairpin portion via at least a pair of holding bodies. Although the straight tube portion of the hairpin tube body 7a near 7c is held, the present invention is by no means limited to this, and for example, the hairpin portion of the hairpin tube 7 may be held.
The straight tube portion of the tube main body 7a near 7c is held (not shown) by a holding means, and then the tube expanding mandrel 2 is press-fitted from the tube opening portion 7b of the hairpin tube 7 for a predetermined distance to form a tube portion 7d having a predetermined length. A plurality of expandable / contractible tube contact members 3f that are formed and then advance the peripheral surface section 7e of the expanded tube section 7d from the tube opening section 7b side of the hairpin tube 7.
The gripping body 3 having the above-mentioned structure holds the hairpin portion 7c of the hairpin tube 7 with at least one pair of gripping bodies 4a. After holding the hairpin tube 7, the holding means may be released, and then the tube expanding mandrel 2 may be advanced to the hairpin portion 7c side to expand the hairpin tube 7 to manufacture the heat exchanger.

Therefore, in this case, the hairpin portion 7c of the hairpin tube 7 projects with a step so that it cannot be easily and instantaneously clamped by the pair of clamping bodies 4a, or is irregular. If the insertion pattern etc., hairpin
Until 7c is securely held, not only the hairpin tube 7 can be temporarily held by the expanding device by the holding means, but also the hairpins inserted in a plurality of rows so as to extremely close each other. It is possible to hold all of the pipes 7 reliably, and even if the diameter of the hairpin pipe 7 of the heat exchanger 5 for expanding the pipe changes depending on the type of the specification of the heat exchanger 5, it is possible to surely and surely and The mouth portion 7b of the hairpin tube 7 can be firmly fixed, and the hairpin portion 7c must be replaced with a hook body having a shape that matches the substantially same arc shape as the inner periphery of the hairpin portion 7c. Such an inconvenience can be securely held without any deformation, and can be held and held by the holding body 4a without being deformed.

<Sixth Embodiment> Further, in the above embodiment, the hairpin tube 7 is inserted through the heat exchanger 5, but the hairpin tube 7 is not necessarily limited to the hairpin tube 7. For example, as shown in FIG.
As shown in (a), a straight pipe 7i having a certain length is inserted into the heat exchanger 5, and one end side 7h of the straight pipe 7i is held by being held by at least a pair of holding bodies 4a. Then, similarly, the pipe expanding mandrel 2 is press-fitted (not shown) with a predetermined size from the pipe opening 7b on the other end side opposite to the one end side 7h to form a pipe expanding portion 7d having a predetermined length, and then the pipe expanding portion 7d. A predetermined amount of gap 3a is formed between the respective pipe contact members 3f by the gripping body 3 which has a plurality of expandable and contractible pipe contact members 3f that advance the peripheral surface portion 7e of 7d from the pipe mouth portion 7b side. While holding it as appropriate, the pipe expanding mandrel 2 is then advanced to the one end side 7h to move the straight pipe 7i.
May be expanded to produce the heat exchanger 5.

Therefore, in this case, even if the hairpin portion 7c does not project to the heat exchanger 5 for expanding the tube,
Not only the one end side 7h of the straight pipe 7i can be securely and firmly held by the sandwiching body 4a, but the pipe diameter of the straight pipe 7i of the heat exchanger 5 for expanding the pipe is larger than that of the heat exchanger 5. Even if it changes depending on the type of specifications, the size of the pipe diameter can be automatically adjusted through the gaps 3a formed between the pipe contact members 3f to hold it securely and firmly. There is an advantage that
Each of the opposing inner peripheral surfaces of the holding body 4a may be provided with a slip prevention means such as a rugged concave-convex treatment 4b as shown in FIG. Moreover, there is an advantage that the one end side 7h of the straight pipe 7i can be held.

<Seventh Embodiment> Further, in the above embodiment, the pipe contact member 3f is in a state in which the peripheral surface portion 7e of the expanded pipe portion 7d is provided with a predetermined amount of gap 3a between the respective pipe contact members 3f. The pipe to be expanded is held for positioning by firmly gripping it with, for example, as shown in FIG. 5 (a), the expansion mandrel 2 is press-fitted into the pipe opening 7b ( After the arrow D) is formed to form the expanded tube portion 7d, and the peripheral surface portion 7e of the expanded tube portion 7d is advanced (arrow E) to be gripped by the tube contact member 3f of the gripping body 3 or before it is advanced (FIG. (Not shown), the pipe expanding mandrel 2 is inserted into the pipe expanding portion 7d, and the pipe expanding portion 7d
A pressure receiving member 13 having a retractable tubular main body 13a provided with a pressure receiving body 14 using urethane or the like at a position corresponding to a pipe contact member 3f for gripping the pipe as shown in FIG. The expanded tube portion 7d may be firmly held between the outer peripheral surface side and the inner peripheral surface side by moving the gripper guide tube 3c forward (arrow G) as in the above embodiment. In this case, the expanded portion 7d at the time of gripping the expanded portion 7d via the pipe contact member 3f is used.
This has the advantage that the deformation of the pipe in the pipe inner direction of the peripheral surface portion 7e can be surely prevented.

However, the point is to hold the hairpin portion of the hairpin tube inserted through the heat radiation fins having a predetermined interval and having a predetermined length, and then expand the tube from the mouth portion of the hairpin tube. A mandrel for press-fitting was press-fitted with a predetermined size to form a pipe expansion part of a predetermined length, and then the peripheral surface part of the pipe expansion part was provided with a plurality of pipe abutting members which can be expanded and contracted radially in a direction intersecting the longitudinal direction of the pipe. The gripping body should be gripped so that a predetermined amount of gap is formed between the respective tube contact members, and then the tube expanding mandrel can be advanced to the hairpin portion side to expand the hairpin tube. For example, the heat exchanger manufacturing device does not necessarily have to be a horizontal device, but may be a vertical device, and the number, arrangement and location of gripping bodies or holding bodies having a plurality of pipe contact members. Needless to say, etc. are by no means limited.

[0044]

As described above, in the method for manufacturing a heat exchanger according to the present invention, the hairpin portion of the hairpin tube inserted into the radiation fin is clamped by the clamp body, and then from the mouth portion of the hairpin tube. After the pipe expanding mandrel is press-fitted with a predetermined size to form a pipe expanding portion having a predetermined length, the peripheral surface of the pipe expanding portion is held by a gripping body having a plurality of pipe contacting members. Grip so that a predetermined amount of gap is formed between them, and then move the mandrel for expanding the tube to the hairpin portion side to expand the hairpin tube to manufacture the heat exchanger, so that the heat radiating fins of the heat exchanger are used. Even when each hairpin tube to be inserted has a predetermined pattern so as to form a plurality of rows such as three rows and four rows in a zigzag manner so that the distances between the hairpin tubes are extremely close to each other, surely and firmly. Position the hairpin tube located on the inside to the outside. It can be held in the same way as hairpin tube.

Therefore, even if the diameter of the hairpin tube of the heat exchanger for expanding the tube changes depending on the type of specifications of the heat exchanger, the hairpin tube's mouth side can be reliably and firmly gripped. It can be held via a holding body, and the hairpin portion does not need to be replaced with a hook body having a shape that is substantially the same as the inner circumference of the hairpin portion. Since it can be securely held by the holding body without being deformed,
In particular, there is a remarkable effect that the production efficiency of a heat exchanger having a plurality of rows of insertion patterns can be significantly improved.

Further, in the method for manufacturing the heat exchanger according to the present invention, the tube body near the hairpin portion of the hairpin tube is held by the holding means, and then the tube expanding mandrel is press-fitted from the tube mouth portion of the hairpin tube with a predetermined size. Each of the tube abutting members by a gripping body having a plurality of expandable / contractible tube abutting members which form an expanded portion of a predetermined length and then advance the peripheral surface of the expanded portion from the tube mouth side of the hairpin tube. Grasp so that a predetermined amount of gap is formed between them, then the hairpin portion of the hairpin tube,
After holding the hairpin tube by sandwiching at least a pair of sandwiching bodies 4a, the holding means is released, and thereafter the tube expanding mandrel is advanced to the hairpin portion side to expand the hairpin tube to produce a heat exchanger. When the hairpin portion of the hairpin tube is projected with a step so that it cannot be easily and instantaneously pinched by the pair of holding bodies, or the hairpin portion has an irregular insertion pattern, etc. The hairpin tube can be temporarily held by the tube expanding device by the holding means until the hairpin is securely held.

Therefore, not only can all of the hairpin tubes inserted in a plurality of rows so that the distance between them is extremely close to each other can be reliably held, but the diameter of the hairpin tubes of the heat exchanger for expanding the tubes can also be heat exchanged. Even if it changes depending on the type of vessel specification, the mouth side of the hairpin tube can be securely and firmly fixed, and the hairpin section has an arc that is substantially the same as the inner circumference of the hairpin section. Since it does not require any inconvenience of having to replace the hook body with a shape that fits the shape, it can be securely held by the holding body without being deformed, and it can be used with a variety of insertion patterns. It has a remarkable effect that the production efficiency of the exchanger can be greatly improved.

Further, in the method for manufacturing a heat exchanger according to the present invention, a hairpin tube having a certain length is inserted into a plurality of heat radiating fins which are superposed at a predetermined interval, and then, in the vicinity of the hairpin portion of the hairpin tube. The tube body is held by at least a pair of holding bodies to hold the hairpin tube, and then the tube expanding mandrel is press-fitted from the tube mouth portion of the hairpin tube with a predetermined dimension to form a tube expanding section of a predetermined length, and then the tube expanding The peripheral surface of the hairpin tube is gripped by a plurality of expandable and contractible gripping bodies that advance from the mouth side of the hairpin tube so that a predetermined amount of gap is formed between the gripping bodies, and then the pipe expanding mandrel is held. Since the hairpin tube is expanded by advancing toward the hairpin portion side to manufacture the heat exchanger, the hairpin portion of the hairpin tube has an insertion pattern or the like that cannot be held by being held by the pair of holding bodies. If it becomes protruding, The hairpin portion tube body in the vicinity of the hairpin tube can be reliably held on behalf of the hairpin portion.

Therefore, even if the diameter of the hairpin tube of the heat exchanger for expanding the tube changes depending on the type of specifications of the heat exchanger, the hairpin tube can be securely and firmly fixed to the mouth end side. In addition, the hairpin portion can be securely and deformed without any troublesome work such as replacement of the hairpin portion with a hook body having an arc shape substantially the same as the inner circumference of the hairpin portion. Since it is sandwiched and held by the sandwiching body, there is a remarkable effect that the production efficiency of the heat exchanger having various insertion patterns can be significantly improved.

Further, in the method for manufacturing a heat exchanger according to the present invention, a straight pipe having a certain length is inserted into a plurality of radiating fins superposed at a predetermined interval, and then one end side of the straight pipe is inserted. , Holding and holding it by at least a pair of holding bodies, and then press-fitting a pipe expanding mandrel with a predetermined size from a pipe opening portion on the other end side opposite to the one end side to form a pipe expanding portion of a predetermined length, and then expanding the pipe. The peripheral surface of the pipe is held by a plurality of expandable / contractible gripping bodies that advance from the tube mouth side so that a predetermined amount of gap is formed between the gripping bodies, and then the pipe expanding mandrel is attached to the one end side. As the heat exchanger is manufactured by advancing to the straight tube to expand the straight tube, even if the heat exchanger for expanding the tube does not have a hairpin portion, it can be reliably and firmly connected to one end side of the straight tube. Of a versatile heat exchanger by sandwiching and holding a sandwich It has an effect that can be done.

Further, in the method for manufacturing a heat exchanger according to the present invention, at least a pair of sandwiching members and a pipe expanding mandrel for advancing so that the pipe expanding portion is press-fitted into the hairpin tube or the straight tube held by the gripping body. Since the hairpin tube or the straight tube is moved in the same direction and a tensile force is applied to the hairpin tube or tube, the contraction of the entire length of the tube at the time of tube expansion can be further minimized.

Further, as an apparatus for carrying out the method for expanding the heat exchanger tube according to the present invention, the present invention inserts a hairpin portion of a hairpin tube inserted into a plurality of polymerized heat radiation fins or a heat radiation fin. At least one pair of pinching members for holding and holding one end side of the straight pipe held therein, and a port opening portion of the hairpin tube held through the holding members or a pipe port at the other end side of the straight pipe holding one end side thereof And a pipe expanding mandrel that is provided so as to be able to extend and retract so as to face the pipe portion, and when the pipe expanding mandrel is press-fitted from the pipe opening portion with a predetermined size to form a pipe expanding portion having a predetermined length, the circumference of the pipe expanding portion A gripping body having a plurality of expandable and contractible pipe abutting members for advancing the surface portion from the pipe mouth portion side and gripping the pipe expanding portions so as to form a predetermined amount of gap therebetween. Therefore, each of the heat radiation fins of the heat exchanger is staggered. Even when the pinning tubes are arranged in multiple rows of three rows or four rows so that the spacing between them is close to each other, the hairpin tube that is reliably and firmly located on the inner side is the same as the hairpin tube that is located on the outer side. Can be held at.

Therefore, even if the diameter of the hairpin tube of the heat exchanger for expanding the tube changes depending on the type of specifications of the heat exchanger, the hairpin tube is surely and firmly held on the mouth side. Not only is it possible to do this, but also the hairpin part needs to be replaced with a hook body that has a shape that matches the arc shape that is almost the same as the inner circumference of the hairpin part, without any annoyance. The hairpin section can be held without deforming to minimize the shrinkage of the hairpin tube, and when the straight tube is inserted not only in the hairpin tube but also in the radiation fin, or when the straight tube approaches each other. It is possible to provide a very excellent heat exchanger manufacturing apparatus that can minimize the contraction of the full length of the straight pipe even after the straight pipe is inserted in a zigzag shape. Have an effect It came to that.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger manufacturing apparatus for carrying out a heat exchanger manufacturing method of the present invention.

2A and 2B show a gripping body used in the heat exchanger manufacturing apparatus of the present invention, in which FIG. 2A is an enlarged partial sectional view of an essential part, FIG. 2B is an enlarged view of an essential part, and FIG. (C) and (d) are enlarged partial cross-sectional views of the main part during pipe expansion.

FIG. 3 shows a sandwiching body used in the heat exchanger manufacturing apparatus of the present invention. FIG. 3 (A) is an enlarged front view of a main part, and FIGS. 3 (B) and 3 (C) are enlarged partial sectional views of the main part. .

4A and 4B show a sandwiching body used in the heat exchanger manufacturing apparatus of the present invention, in which FIG. 4A is an enlarged front view of a main part, and FIG. 4B is an enlarged partial cross-sectional view of the main part.

FIG. 5 shows a gripping body used in the heat exchanger manufacturing apparatus of the present invention, and FIGS. 5 (a) and 5 (c) are enlarged partial cross-sectional views of a main part during pipe expansion.

FIG. 6 shows a conventional heat exchanger manufacturing apparatus, and FIG.
Is an enlarged front view at the time of tube expansion, FIG. 2B is a perspective view of the clamp, FIG. 3C is a perspective view showing another embodiment of the clamp,
FIG. 4D is a perspective view of the hook body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heat exchanger manufacturing apparatus 1a ... Manufacturing apparatus main body 2 ... Pipe expansion mandrel 3 ... Grasping body 3f ... Tube contact member 4 ... Nipping body transfer device 5 ... Heat exchanger 6 ... Radiation fins 7 ... Hairpin tube

[Procedure amendment]

[Submission date] August 30, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5 shows a gripping body used in the heat exchanger manufacturing apparatus of the present invention, and FIGS. 5 (A) and 5 ( B ) are enlarged partial cross-sectional views of a main part at the time of pipe expansion.

Claims (13)

[Claims] 1. A hairpin tube inserted into a radiation fin (6) having a predetermined length and having a predetermined length so as to be inserted into the heat radiation fin (6).
Hold the hairpin portion (7c) of (7), and then hold the hairpin tube
After forming the pipe expanding mandrel (2) with a predetermined size from the pipe opening (7b) of (7) to form the pipe expanding part (7d) of a predetermined length, the peripheral surface part (7e) of the pipe expanding part (7d). A gripping body having a plurality of pipe contact members (3f) that can be expanded and contracted radially in a direction intersecting the longitudinal direction of the pipe.
(3) allows a certain amount of gap (3
a) is formed so that the mandrel (2) for expanding the tube is advanced to the hairpin portion (7c) side and then the hairpin tube is formed.
(7) is expanded to produce a heat exchanger, which is a method for producing a heat exchanger. 2. A hairpin tube having a predetermined length and inserted into a plurality of heat radiation fins (6) superposed at predetermined intervals.
The hairpin portion (7c) of (7), at least a pair of holding bodies (4a)
Hold the hairpin tube (7) by holding it, and then press the tube expanding mandrel (2) into the tube opening part (7b) of the hairpin tube (7) with a specified size to expand the tube part (7d) of a specified length. And then the peripheral surface portion (7e) of the expanded portion (7d) is connected to the mouth portion (7b) of the hairpin tube (7).
The gripping body (3) having a plurality of expandable and contractible pipe contact members (3f) advancing from the side forms a predetermined amount of gap (3a) between the pipe contact members (3f). A method for manufacturing a heat exchanger, characterized by holding the tube, and then advancing the tube expanding mandrel (2) toward the hairpin portion (7c) to expand the hairpin tube (7) to produce a heat exchanger. 3. A hairpin tube inserted into a radiation fin (6) having a predetermined length and having a predetermined length.
The straight tube part of the tube body (7a) near the hairpin part (7c) of (7) is held by a holding means, and then the mouth part (7) of the hairpin tube (7) is held.
The mandrel (2) for pipe expansion is press-fitted from b) to a predetermined size to form a pipe expansion part (7d) of a predetermined length, and then the peripheral surface part (7e) of the pipe expansion part (7d) is connected to the hairpin pipe (7). A gripping body (3) having a plurality of expandable and contractible pipe abutting members (3f) advancing from the mouth (7b) side creates a predetermined amount of gap (3a) between the pipe abutting members (3f). Hold the hairpin tube (7) by grasping it so that it is formed, then holding the hairpin portion (7c) of the hairpin tube (7) with at least a pair of holding bodies (4a), and then releasing the holding means. Then, the tube expanding mandrel (2) is then advanced to the hairpin portion (7c) side to expand the hairpin tube (7) to manufacture a heat exchanger. 4. A hairpin tube inserted into a radiation fin (6) having a predetermined length and having a predetermined length.
The straight tube part of the tube body (7a) near the hairpin part (7c) of (7) is clamped by at least a pair of clamps (4a) to hold the hairpin tube (7), and then the tube of the hairpin tube (7). Insert the pipe expanding mandrel (2) with a specified size from the mouth (7b) and
d), and then has a plurality of expandable / contractible pipe contact members (3f) that advance the peripheral surface portion (7e) of the expanded pipe portion (7d) from the pipe mouth portion (7b) side of the hairpin pipe (7). The gripping body (3) is gripped so that a predetermined amount of gap (3a) is formed between the respective pipe contact members (3f), and then the pipe expanding mandrel (2) is hairpin portion (7c).
A method for manufacturing a heat exchanger, characterized by expanding the hairpin tube (7) by advancing it to the side and manufacturing a heat exchanger. 5. A straight pipe (7i) inserted at a predetermined length into a plurality of heat dissipating fins (6) having a predetermined interval and having a predetermined length, and one end side (7h) of the straight pipe (7i) at least a pair of sandwiching bodies ( 4a) or hold it by a holding means, and then press-fit the pipe expanding mandrel (2) with a predetermined size from the pipe opening (7b) on the other end side opposite to the one end side (7h). A plurality of expandable and contractible pipe abutting members (3f) that form the expanded pipe portion (7d) and advance the peripheral surface portion (7e) of the expanded pipe portion (7d) from the pipe opening portion (7b) side on the other end side. The gripping body (3) has a grip so that a predetermined amount of gap (3a) is formed between the respective pipe contact members (3f), and then the pipe expanding mandrel (2) is connected to the one end side (7h). ) To straight pipe (7i)
A method for manufacturing a heat exchanger, comprising expanding the pipe to produce a heat exchanger. 6. The holding body (4a) holds the pipe expanding portion (7d).
The hairpin tube (7) or the straight tube (7i) is moved in the same direction as the expanding mandrel (2) that is advanced so as to be press-fitted into the hairpin tube (7) or the straight tube (7i) held by (3). ) Is applied with a tensile force, The manufacturing method of the heat exchanger in any one of Claim 2 thru | or 5 characterized by the above-mentioned. 7. A holding body for holding a peripheral surface portion (7e) of the pipe expanding portion (7d).
Before the pipe contact member (3f) of (3) is grasped so that a predetermined amount of gap (3a) is formed between the pipe contact members (3f), the pipe expansion part (7
7. The method for manufacturing a heat exchanger according to claim 1, wherein a pressure receiving member (13) corresponding to the pipe contact member (3f) enters into d). 8. A hairpin tube in which a tube expanding device body (1a) is inserted through a plurality of heat radiating fins (6) that are superposed at predetermined intervals.
At least a pair of holding bodies (4a) for holding one end side (7h) of the straight pipe (7i) inserted through the hairpin portion (7c) of (7) or the heat radiation fin (6), and the holding body (4a). The hairpin tube (7) held via (4a) faces the mouth (7b) of the hairpin tube (7) or the one end (7h) of the straight tube (7i) that holds the other end of the straight tube (7i). Pipe expanding mandrel (2) that can be freely moved in and out, and the pipe expanding mandrel
When (2) is press-fitted with a predetermined size from the pipe opening portion (7b) to form the expanded portion (7d) of a predetermined length, the peripheral surface portion of the expanded portion (7d)
A plurality of expandable / contractible tube abutments for advancing (7e) from the tube mouth section (7b) side and gripping the tube expanding section (7d) to form a predetermined amount of gap (3a) between them. Gripping body having member (3f)
(3) An apparatus for manufacturing a heat exchanger, comprising: 9. The gripping body (4a) is provided with an anti-slip means for preventing the hairpin section (7c) of the pinched hairpin tube (7) or one end side (7h) of the straight tube (7i) from slipping. 9. The heat exchanger manufacturing apparatus according to claim 8, wherein 10. The holding body (4a) or the tube expanding device body (1a)
At least one of the above hairpin tubes during tube expansion.
(7) or a holding body moving device (4) for moving the holding body (4a) in the same direction as the pipe expanding mandrel (2) that is advanced so as to be press-fitted into the straight pipe (7i). Claim 8
Or the manufacturing apparatus of the heat exchanger of 9 above. 11. Each of the tube contact members (3f) of the gripping body (3) has a gripping position at which each of the tube contacting members (3f) comes into contact with the expanding portion (7d) of the hairpin tube (7) or the straight tube (7i). By pressing the peripheral surface portion (7e) of the expanded pipe portion (7d), a locking bulge portion (7g) is formed in the hairpin pipe (7) or the pipe inner peripheral portion (7f) of the straight pipe (7i). 11. The heat exchanger manufacturing apparatus according to claim 8, further comprising a protrusion (3e). 12. A hairpin tube (7) or a straight tube (7i) by press-fitting a tube expanding mandrel (2) into the tube expanding device body (1a).
Of the gripping body (3) that enters into the pipe expanding portion (7d) and is positioned and holds the peripheral surface portion (7e) of the pipe expanding portion (7d) so as to form a predetermined amount of gap (3a). 12. A pressure receiving member (13) corresponding to each of the pipe contact members (3f) is provided so as to be able to move in and out so as to face the pipe mouth portion (7b).
An apparatus for manufacturing a heat exchanger according to any one of 1. 13. A pressure receiving member (13) which is inserted into and positioned in the pipe expanding portion (7d) has a tubular main body (13a) in which a pipe expanding mandrel (2) is reciprocally inserted. The pressure receiving body (14), which is in contact with the pipe inner peripheral portion (7f), is provided on the peripheral surface of the cylindrical main body (13a).
The heat exchanger manufacturing apparatus described.