JP2873568B2 - Method and apparatus for manufacturing heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention expands a hairpin even if a hairpin tube or a straight tube inserted into each through hole of a plurality of superposed heat radiation fins is expanded and formed integrally with the heat radiation fin. The present invention relates to a method and an apparatus for manufacturing a heat exchanger capable of keeping the entire length of a hairpin tube or a straight tube substantially equal to that 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 disclosed in the above publication, as shown in FIG. 6, a large number of radiation fins 6 superposed at a predetermined interval.
The mandrel 2 for expanding the tube is inserted from the mouth 7b of the hairpin tube 7 of the heat exchanger 5 having a plurality of hairpin tubes 7 inserted therein, and the hairpin tube 7 and the radiation fins 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 tube is inserted from the mouth 7b of the hairpin tube 7, and the mouth fin 6 is closer to the mouth than the radiation fin 6 at one end.
At the stage where the 7b side is expanded, this expanded portion 7d is fixed in the through hole 9 of the clamp 8 which does not move to the hairpin portion 7c,
The subsequent insertion of the expanding mandrel 2 into the hairpin tube 7 restrains the fixed portion of the hairpin tube 7 by the clamp body 8 without moving to the hairpin portion 7c side, and connects the fixed portion of the hairpin tube 7 by the hook body 10 to the tube. This is a method that is performed in a state where it is restrained without moving to the mouth 7b.

According to the above-mentioned 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, in the above method, as shown in FIG. 5 (b), the mouth portion 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. For example, when the number of hairpin tubes 7 inserted in a staggered manner through the radiating fins 6 becomes three rows, four rows, or a plurality of rows, the hairpin tubes located on the inner side are restricted. 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, if the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the pipe changes depending on the type of the specification of the heat exchanger 5, the tube of the hairpin tube 7 can no longer be reliably inserted through the through hole 9 of the clamp 8. Not only can the mouth 7b not be fixed,
As shown in FIG. 4D, the hairpin 7c via the hook body 10 is provided.
If the hook body 10 itself is not replaced by one having a shape that matches the same arc shape as the inner periphery of the hairpin portion 7c, the inner peripheral portion of the hairpin portion 7c due to the contraction of the hairpin tube 7 that occurs at the time of expanding the tube. There have been various very serious problems that these are easily deformed.

In other words, the present invention is directed to a case where the hairpin tubes inserted in a staggered manner into the radiating fins of the heat exchanger are arranged in a plurality of rows of three rows and four rows so as to approach 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 also the diameter of the hairpin tube of the heat exchanger that expands the tube is smaller than that of the heat exchanger. Even if it changes depending on the type of specification,
Not only can the mouth of the hairpin tube be securely and firmly fixed, but the hairpin must also be replaced with a hook that has an arc shape that is approximately the same as the inner circumference of the hairpin. It does not require any inconvenience such as the need to securely and instantaneously hold the hairpin without deforming it, minimizing the shrinkage of the hairpin tube. Even when the pipes are inserted or when the straight pipes are inserted close to each other in a staggered manner, it is possible to minimize the total length of the straight pipes after being expanded, which is extremely excellent. It is an object of the present invention to provide a method and an apparatus for manufacturing a heat exchanger.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned various problems, the present invention has invented a completely new method for manufacturing a heat exchanger and an apparatus therefor, and has taken the following measures.

That is, according to the present invention, the hairpin tube 7 is held by holding the hairpin portion 7c of the hairpin tube 7 with at least a pair of holding members 4a, and then the mandrel 2 for expanding the tube extends from the mouth 7b of the hairpin tube 7. Is press-fitted into a predetermined size to form a predetermined length of expanded tube portion 7d, and thereafter, a plurality of expandable and contractible tube contact members 3f which protrude from the tube opening portion 7b side of the peripheral surface portion 7e of the expanded tube portion 7d. The gripping body 3 having a gripping member is gripped so that a predetermined amount of gap 3a is formed between the respective pipe contact members 3f, and then the mandrel 2 for expanding the tube is advanced to the hairpin portion 7c side so that the hairpin tube 7 is formed. Is expanded.

Therefore, for example, the radiation fins 6 of the heat exchanger
Even if the hairpin tubes 7 to be inserted into a predetermined pattern are formed so as to form a plurality of rows such as three rows and four rows in a staggered manner so as to extremely close each other, In addition, the hairpin tube 7 located on the inner side can be held firmly in the same manner as the hairpin tube 7 located on the outer side, and the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the pipe is changed. Even if it changes depending on the type of the specification of the vessel 5, it is possible to securely and firmly fix the tube port 7b side of the hairpin tube 7, and furthermore, the hairpin section 7c is also fixed to the inner periphery of the hairpin section 7c. It has the advantage that it can be securely held and held by the holding body 4a without any inconvenience that it has to be replaced with a hook body having a shape that matches the substantially same arc shape as that of the holding body 4a. 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 holding means, and then the mandrel 2 for expanding the tube is pressed into the hairpin tube 7 at a predetermined size from the mouth 7b. A gripping body 3 having a plurality of expandable and contractible pipe contact members 3f which forms a predetermined length of expanded tube portion 7d and thereafter advances the peripheral surface portion 7e of the expanded tube portion 7d from the tube opening 7b side of the hairpin tube 7
, So that a predetermined amount of gap 3a is formed between the respective tube contact members 3f, and then the hairpin portion 7c of the hairpin tube 7 is held by at least a pair of holding members 4a to hold the hairpin tube 7. Then, the holding means is released, and then the mandrel 2 for expanding the tube is advanced toward the hairpin portion 7c to expand the hairpin tube 7.

Therefore, for example, the hairpin portion 7c of the hairpin tube 7 projects with a step so that it cannot be easily and instantly held by the pair of holding members 4a, or has an irregular insertion pattern. In such a case, the hairpin tube 7 can be temporarily held by the expanding device by the holding means until the hairpin portion 7c is securely held, and the distance between the hairpin tubes 7 is extremely close to each other. Not only can all the hairpin tubes 7 inserted in a plurality of rows be securely held, but also the diameter of the hairpin tubes 7 of the heat exchanger 5 for expanding the tube varies depending on the type of specification of the heat exchanger 5. In this case, the hair port 7b side of the hairpin tube 7 can be securely and firmly fixed, and the hairpin portion 7c also fits in the same arc shape as the inner circumference of the hairpin portion 7c. Must be replaced with a hook with a different shape Hassle such no Banara also surely not require any, and clamping member without deformation
4a has the advantage that it can be clamped and held.

Further, according to the present invention, at least one pair of a tube main body 7a near a hairpin portion 7c of a hairpin tube 7 which is inserted with a predetermined length into a plurality of heat radiation fins 6 superposed at a predetermined interval. The hairpin tube 7 is held by being held by the holding body 4a, and then the mandrel 2 for expanding the tube is press-fitted with a predetermined dimension from the mouth portion 7b of the hairpin tube 7 to form the expanded tube portion 7d having a predetermined length. A predetermined amount of gap 3a is provided between each of the tube contact members 3f by a gripping body 3 having a plurality of expandable and contractible tube contact members 3f that protrude from the tube opening 7b side of the hairpin tube 7 on the peripheral surface portion 7e of 7d. Is formed so that the pipe-forming mandrel 2 is formed.
Is advanced 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 projects with an insertion pattern or the like that cannot be held and held by the pair of holding members 4a, the hairpin portion of the hairpin tube 7 (7c) Connect the hairpin section to the pipe body (7a) near
In addition to (7c), not only can it be securely held, but even if the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the pipe changes depending on the type of specification of the heat exchanger 5, In addition, it is possible to firmly and firmly fix the tube opening 7b side of the hairpin tube 7, and further replace the hairpin portion 7c with a hook body having a shape that matches the substantially same arc shape as the inner periphery of the hairpin portion 7c. There is an advantage that it is possible to securely hold and hold the holding member 4a without any inconvenience that the holding member 4a must be required and without any deformation.

Further, according to the present invention, one end 7h of a straight pipe 7i inserted with a predetermined length into a plurality of superposed heat radiation fins 6 at a predetermined interval is held by at least one pair of holding members 4a. Then, the mandrel 2 for pipe expansion is press-fitted with a predetermined dimension from a pipe port 7b on the other end side opposite to the one end side 7h to form a pipe expansion section 7d of a predetermined length. A predetermined amount of clearance is provided between each of the tube contact members 3f by the gripping body 3 having a plurality of expandable and contractible tube contact members 3f that protrude from the peripheral surface portion 7e of the portion 7d from the other end side of the tube opening 7b. Grab 3a to be formed,
Thereafter, 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 7h of the straight pipe 7i is securely and firmly held by the holding body 4a. It has the advantage that it can.

Further, according to the present invention, the holding body 4a is moved in the same direction as the expanding mandrel 2 which advances to press-fit the expanded portion 7d into the hairpin tube 7 or the straight tube 7i gripped by the gripping member 3. By moving and applying a tensile force to the hairpin tube 7 or the straight tube 7i, there is an advantage that the contraction of the entire length of the tube during expansion can be minimized.

Further, according to the present invention, the tube contact member 3f of the gripping body 3 holds the peripheral surface portion 7e of the expanded tube portion 7d so that a predetermined amount of gap 3a is formed between the respective tube contact members 3f. Since the pressure receiving member 13 corresponding to the pipe contact member 3f enters the expanded tube portion 7d before, the peripheral surface portion 7e of the expanded tube 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 7e of the expanded portion 7d when gripping the expanded portion 7d via the tube contact member 3f
This has the advantage that the deformation of the pipe in the pipe inward direction can be reliably prevented.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

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

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

1c is a heat exchanger 5 erected 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 tube expanding mandrel provided on the apparatus main body 1a in a substantially horizontal state and reciprocally movable. The tube expanding mandrel 2 has an outer peripheral portion as shown in FIG. An inclined surface 3b that is upwardly directed toward the distal end of the tube expanding mandrel 2 is formed, and has a plurality of tube contact members 3f that are radially expandable and contractible in a direction intersecting the longitudinal direction of the hairpin tube 7. The body 3 is reciprocally slidably fitted to the outside, and a gripping body guide cylinder 3c provided on a reciprocally movable plate body 3d slides on the gripping body 3 via a cylinder (not shown). It is freely fitted outside.

Each of the tube contact members 3f of the gripping body 3 surrounds the outer periphery of the mandrel 2 along the longitudinal direction of the mandrel 2 as shown in FIG. 4
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.

A pair of clamps 4 are provided on the base 1b and are rotatably supported so as to clamp a hairpin portion 7c of a hairpin tube 7 inserted through the radiation fins 6 of the heat exchanger 5. Body 4a and a 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 apparatus for manufacturing a heat exchanger according to the first embodiment of the present invention has the above configuration. Next, a case where a mandrel for expanding a pipe is press-fitted into a hairpin tube of a heat exchanger using such an apparatus will be described. .

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

Next, the hairpin section 7c of the hairpin tube 7 of the heat exchanger 5 is moved forward by the reciprocating cylinder 4f of the holding body moving device 4 to move the base 4d along the guide rail 12 (not shown). At the same time, by driving the drive cylinder 4e, the hairpin portions 7c of the hairpin tubes 7 are respectively held by the pair of holding members 4a as shown in FIG. 3A. At this time, the pair of holding members 4a On the opposing inner surface portion, a tongue-shaped concave portion 4g is provided so as to oppose so that the hairpin portion 7c can be firmly and tightly clamped.

Next, as shown in FIG. 2C, each of the expanding mandrels 2 is press-fitted for a predetermined distance from the opening 7b of each of the hairpin tubes 7 to form an expanding portion 7d having a predetermined length. Thereafter, the four expandable and contractible four tube contact members 3f of the gripping body 3 that advance from the tube opening 7b side of the hairpin tube 7 on the peripheral surface portion 7e of the expanded tube portion 7d are advanced (arrow B) to thereby extend the peripheral surface portion. Externally fit to surround 7e.

Thereafter, when the grasping body guide cylinder 3c externally fitted to the four pipe contact members 3f is advanced (arrow C) in the same direction as the forward direction of the expanding mandrel 2, the grasping body guide cylinder is moved. 3c
Presses the upwardly inclined surface 3b of each of the tube contact members 3f to cause each of the tube contact members 3f to contract in the axial direction of the pipe expanding mandrel 2, and each of the tube contact members 3f The peripheral surface portion 7e of the expanded portion 7d of the hairpin tube 7 is firmly gripped with a predetermined amount of gap 3a between the respective tube contact members 3f. In this state, the expansion mandrel 2 is again held. While being advanced toward the hairpin portion 7c of the hairpin tube 7, the holding body moving device 4 having the holding body 4a holding the hairpin portion 7c is slightly moved (retracted) in the same direction as the advancing direction of the expansion mandrel 2. ), The contraction of the hairpin tube 7 during expansion, as well as the contraction of the entire length of the hairpin tube 7 in consideration of the slippage of the hairpin tube 7 from the tube contact member 3f and the holding member 4a. The advantage is that a minimally heat exchanger can be manufactured.

Therefore, for example, when the hairpin tubes 7 are inserted in the heat radiation fins 6 of the heat exchanger 5 in a staggered manner (not shown), the hairpin tubes 7 inserted in a staggered manner are spaced from each other (insertion). 3 rows or 4
Even when the hairpin tube 7 is inserted into a plurality of rows, the hairpin tube 7 located on the inner side of the heat exchanger 5 is surely and firmly connected to the hairpin tube 7 in the same manner as the hairpin tube 7 located on the outer side. Each of the gripping bodies 3 having a plurality of pipe contact members 3f that protrude from the direction of the mouth 7b can securely grip and fix individually.

Therefore, even if the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the pipe changes depending on the type of specification of the heat exchanger 5, for example, the tube contact member 3f of the gripping body 3 Respectively, 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. Automatically adjusted via the gap 3a generated between the pipe contact members 3f of
In addition to being able to firmly hold the tube mouth 7b side of the hairpin tube 7, the hairpin portion 7c is also replaced with a hook body having a shape that matches the substantially same arc shape as the inner periphery of the hairpin tube 7c. Since the tongue-shaped concave portion 4g provided on the holding body 4a can be held tightly in opposition to the tongue-shaped concave portion 4g without any need for any inconvenience such as the need for expansion, Even if the total length of the hairpin tube 7 or the outer diameter of the hairpin tube 7 used for the above is changed according to the specifications of the heat exchanger 5, it is possible to apply a desired expansion tube to the heat exchanger without changing the device itself. There are advantages that can be done.

<Second Embodiment> In the above-described embodiment, a tongue-shaped concave portion is provided on each of the opposed inner peripheral surfaces of the holding body of the holding body moving device. 3
(B) As shown in (b), a convex surface treatment having a plurality of tops as a slip-preventing means for preventing slippage of the hairpin portion 7c sandwiched between the opposing inner peripheral surfaces of the sandwiching body, and rib-like irregularities As shown in the surface treatment 4b or the same figure (c), an arc-shaped overhang portion 4c having a predetermined dimension may be provided in a direction from the outer peripheral arc surface of the hairpin portion 7c to the inside of the hairpin portion 7c. May be affixed (not shown) to the opposing inner peripheral surfaces of the holding body. In short, providing the anti-slip means on the holding body has the advantage that the hairpin portion 7c can be firmly restrained.

<Third Embodiment> Further, in the above embodiment, four tube contact members 3f of the gripping body 3 are provided along the longitudinal direction of the pipe expanding mandrel so as to surround the outer periphery of the mandrel. A predetermined amount of clearance is provided between the respective tube contact members 3f when the grasping body guide cylinder 3c is advanced to bring each of the tube contact members 3f into close contact with the outer peripheral surface of the mandrel 2 and make contact therewith. 3a is formed in four places.
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-described embodiment, the holding member sandwiches the hairpin portion of the hairpin tube. For example, the heat exchanger 5 has a tube body 7a near the hairpin portion of the hairpin tube. The straight pipe portion is held by a holding means (not shown), and then a pipe expanding mandrel is press-fitted with a predetermined size from a mouth portion of the hairpin tube to form a pipe expanding section of a predetermined length.
Thereafter, a gripping body 3 having a plurality of expandable and contractable pipe abutting members 3f which protrude from the pipe mouth side of the hairpin pipe through the peripheral surface of the expanded pipe section.
When a predetermined amount of gap is formed between the respective pipe contact members 3f, the holding means is moved in the same direction as the pipe expanding mandrel when the pipe expanding mandrel subsequently advances toward the hairpin portion. Then, the hairpin tube may be expanded.

Therefore, in this case, when the hairpin portion 7c of the hairpin tube 7 projects with an insertion pattern or the like that cannot be held and held by the pair of holding members 4a, The tube body (7a) in the vicinity of the hairpin portion (7c) can be securely held instead of the hairpin portion (7c), and the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the pipe is determined by the heat exchanger. Even if it changes depending on the type of specification of 5,
It is possible to securely and firmly hold the tube mouth 7b side of the hairpin tube 7, and also replace the hairpin portion 7c with a hook body having a shape that matches the substantially same arc shape as the inner periphery of the hairpin portion 7c. There is an advantage that it is possible to securely hold and hold the holding body 4a without any need for bothersomeness and no deformation.

<Fifth Embodiment> Further, in the above embodiment, a hairpin tube 7 is inserted through the heat exchanger 5, and the hairpin tube 7 is connected to the hairpin portion 7c or the hairpin portion via at least a pair of holding members. The straight tube portion of the hairpin tube main body 7a near 7c is configured to be held, but the present invention is not limited to this, and for example, the hairpin portion of the hairpin tube 7
The straight pipe portion of the pipe main body 7a in the vicinity of 7c is held (not shown) by holding means, and then the pipe expanding mandrel 2 is press-fitted from the pipe mouth 7b of the hairpin pipe 7 for a predetermined distance to thereby expand the pipe expanding section 7d of a predetermined length. After that, a plurality of expandable and contractible pipe contact members 3f that extend from the pipe opening 7b side of the hairpin pipe 7 along the peripheral surface 7e of the expanded pipe section 7d.
Is gripped so that a predetermined amount of gap 3a is formed between the respective tube contact members 3f, and then the hairpin portion 7c of the hairpin tube 7 is gripped by at least a pair of grippers 4a. After holding the hairpin tube 7, the holding means may be released, and then the mandrel 2 for expanding the tube may be advanced toward the hairpin portion 7c to expand the hairpin tube 7 to manufacture a heat exchanger.

Therefore, in this case, the hairpin portion 7c of the hairpin tube 7 projects with a step so as to be unable to be easily and instantly held by the pair of holding members 4a, or has an irregular shape. Hairpin part when insertion pattern etc.
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> In the above embodiment, the hairpin tube 7 is inserted through the heat exchanger 5, but is not necessarily limited to the hairpin tube 7. For example, FIG.
As shown in (a), a straight pipe 7i having a certain length is inserted into the heat exchanger 5, and one end 7h of the straight pipe 7i is held and held by at least one pair of holding bodies 4a. Thereafter, the pipe-expanding mandrel 2 is press-fitted (not shown) to a predetermined size from the pipe port 7b on the other end opposite to the one end 7h to form a pipe-expanding section 7d having a predetermined length. A predetermined amount of gap 3a is formed between each of the tube contact members 3f by the gripping body 3 having a plurality of expandable and contractible tube contact members 3f which protrude from the tube opening 7b side of the peripheral surface portion 7e of 7d. The mandrel 2 for expanding the pipe is then advanced to the one end 7h, and the straight pipe 7i
May be expanded to manufacture the heat exchanger 5.

Therefore, in this case, even if the hairpin portion 7c does not protrude from the heat exchanger 5 for expanding the pipe,
Not only can one end 7h of the straight pipe 7i be firmly and firmly held and held by the holding body 4a, but also the diameter of the straight pipe 7i of the heat exchanger 5 for expanding the pipe is equal to that of the heat exchanger 5. Even if it changes depending on the type of specification, the size of the pipe diameter can be automatically adjusted via the gaps 3a formed between the respective pipe contact members 3f, and can be securely and firmly held. There are advantages that you can do,
Each of the opposing inner peripheral surfaces of the holding body 4a may be provided with anti-slip means such as a rib-shaped unevenness treatment 4b as shown in FIG. There is an advantage that the one end 7h of the straight pipe 7i can be held.

<Seventh Embodiment> Further, in the above-described embodiment, the pipe contact member 3f has a circumferential surface portion 7e of the expanded pipe portion 7d with a predetermined gap 3a between the respective pipe contact members 3f. The tube to be expanded is held so as to be positioned by firmly gripping the tube with, for example, as shown in FIG. 5 (a), the mandrel 2 for expanding the tube is pressed into the tube opening 7b ( An arrow D) is formed to form the expanded portion 7d, and after or before moving forward (arrow E) so that the tube contact member 3f of the gripper 3 grips the peripheral surface portion 7e of the expanded portion 7d (FIG. (Not shown), the pipe expansion mandrel 2 is inserted into the pipe expansion section 7d, and the pipe expansion section 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.

In short, the hairpin portion of the hairpin tube, which has a predetermined length and is inserted into the plurality of radiation fins which are superposed at predetermined intervals, is held, and then expanded from the mouth portion of the hairpin tube. A plurality of pipe contact members capable of radially expanding and contracting the peripheral surface of the expanded pipe part radially in a direction intersecting the longitudinal direction of the pipe after forming the expanded pipe part of a predetermined length by press-fitting the mandrel with a predetermined size. The hairpin tube can be expanded by gripping the holding member so that a predetermined amount of gap is formed between the respective tube contact members, and then advancing the expansion mandrel to the hairpin portion side. If the heat exchanger manufacturing apparatus is not necessarily a horizontal apparatus, it may be a vertical apparatus, and furthermore, the number, arrangement, and locations of grippers and grippers having a plurality of pipe contact members. Needless to say, the type is not 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 through the radiation fin is sandwiched by the sandwiching member, and then the hairpin tube is opened from the mouth of the hairpin tube. After a pipe expansion mandrel is press-fitted to a predetermined size to form a pipe expansion section of a predetermined length, each pipe contact member is gripped by a gripping body having a plurality of pipe contact members capable of expanding and contracting the peripheral surface of the pipe expansion section. Since a predetermined amount of gap is formed between them, the mandrel for expanding the tube is advanced to the hairpin portion side to expand the hairpin tube to manufacture a heat exchanger. Even when the hairpin tubes to be inserted are formed in a predetermined pattern so as to form a plurality of rows such as three rows or four rows in a staggered manner so as to make the distance between the hairpin pipes extremely close to each other, the hairpin pipes can be reliably and firmly formed. The hairpin tube located on the inner side It can be held in the same way as hairpin tube.

Therefore, even when the diameter of the hairpin tube of the heat exchanger for expanding the pipe changes depending on the type of the specification of the heat exchanger, the mouth portion side of the hairpin tube is securely and firmly gripped by the grip. It can be held through the holding body, and furthermore, the hairpin portion does not need any trouble such that it has to be replaced with a hook body having a shape conforming to the substantially same arc shape as the inner circumference of the hairpin portion. Because it can be held securely and without being deformed by the holding body,
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 greatly improved.

Further, in the method for manufacturing a heat exchanger according to the present invention, the pipe main body near the hairpin portion of the hairpin tube is held by the holding means, and then a pipe expansion mandrel is pressed into the hairpin tube at a predetermined size from the mouth. Each of the tube contact members is formed by a gripper having a plurality of expandable and contractible tube contact members that extend from the tube mouth side of the hairpin tube on the peripheral surface of the tube expansion portion. Grasping so that a predetermined amount of gap is formed between the hairpin portion of the hairpin tube,
After holding the hairpin tube by holding at least the pair of holding bodies 4a, the holding means is released, and then the expansion mandrel is advanced to the hairpin portion side to expand the hairpin tube and manufacture the heat exchanger. If the hairpin portion of the hairpin tube protrudes with a step so that it is not possible to easily and instantly hold it with a pair of holding members, or has an irregular insertion pattern, etc. Until the hairpin tube is securely held, the hairpin tube can be temporarily held by the expansion device by the holding means.

Therefore, not only can all the hairpin tubes inserted in a plurality of rows so as to be extremely close to each other be surely held, but also the diameter of the hairpin tubes of the heat exchanger for expanding the tubes has a heat exchange capacity. Even if it changes depending on the type of the container specification, it is possible to securely and firmly fix the mouth end side of the hairpin tube, and the hairpin portion is also substantially the same arc as the inner circumference of the hairpin portion Heat that has a wide variety of insertion patterns because it is securely held and held by the holding body without any need for the trouble of having to replace it with a hook body with a shape that matches the shape, without any need for deformation It has a remarkable effect that can greatly improve the production efficiency of the exchanger.

Further, in the method of manufacturing a heat exchanger according to the present invention, a hairpin tube having a fixed length is inserted into a plurality of superposed heat radiation fins at a predetermined interval, and thereafter, the vicinity of the hairpin portion of the hairpin tube The tube body is held by at least a pair of holding members to hold the hairpin tube, and then a mandrel for expanding is press-fitted with a predetermined dimension from a mouth portion of the hairpin tube to form a widened portion having a predetermined length. The peripheral surface of the portion is gripped by a plurality of expandable and contractible grippers that advance from the mouth portion side of the hairpin tube so that a predetermined amount of gap is formed between the grippers, and then the mandrel for pipe expansion is gripped. Since the hairpin tube is advanced to the hairpin portion side to expand the hairpin tube and manufacture the heat exchanger, the hairpin portion of the hairpin tube has an insertion pattern or the like that cannot be pinched and held by a pair of pinching members. 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 when the diameter of the hairpin tube of the heat exchanger for expanding the tube varies depending on the type of the specification of the heat exchanger, the tube opening side of the hairpin tube is securely and firmly fixed. It is also possible to reliably and deform the hairpin part without any need for the trouble of having to replace the hairpin part with a hook body having a shape that is substantially the same as the inner circumference of the hairpin part. Instead of being held and held by the holding body, there is a remarkable effect that the production efficiency of the heat exchanger having various insertion patterns can be greatly improved.

Further, in the method for manufacturing a heat exchanger according to the present invention, a straight pipe having a predetermined length is inserted into a plurality of superposed heat radiation fins at a predetermined interval, and then one end of the straight pipe is connected. , Holding and holding by at least a pair of holding bodies, and then press-fitting a pipe-expanding mandrel with a predetermined dimension from a pipe port on the other end opposite to the one end to form a pipe-expanding section of a predetermined length. A plurality of expandable and contractable gripping members that protrude from the tube mouth side of the peripheral portion of the portion are gripped so that a predetermined amount of gap is formed between the gripping members, and then the pipe expanding mandrel is held at the one end side. To expand the straight pipe to produce a heat exchanger, so that even if the heat exchanger for expanding does not have a hairpin portion, it is surely and firmly connected to one end of the straight pipe. Of versatile heat exchangers by sandwiching and holding the sandwich It has an effect that can be done.

Further, in the method for manufacturing a heat exchanger according to the present invention, the at least one pair of holding members may include a tube expanding mandrel which advances to be pressed into a hairpin tube or a straight tube holding the tube expanding portion by the holding member. By moving in the same direction to apply a tensile force to the hairpin tube or the straight tube, there is a remarkable effect that the total length of the tube during the expansion can be minimized.

Further, as an apparatus for carrying out the above-described method for expanding a heat exchanger, the present invention provides an apparatus for inserting a hairpin portion or a heat radiation fin of a hairpin tube inserted into a plurality of heat radiation fins having a predetermined interval. At least a pair of holding bodies for holding and holding one end of the straight pipe, and a mouth of the hairpin tube held through the holding body or the other end of the straight pipe holding one end of the hairpin tube. A pipe-expanding mandrel that is provided so as to be able to move back and forth in opposition to the section, and that when the pipe-expanding mandrel is press-fitted with a predetermined dimension from the pipe opening to form a pipe-expanding section of a predetermined length, A gripping body having a plurality of expandable and contractible pipe contact members for gripping the expanded portion so as to form a predetermined amount of gap between the surface portion and the pipe opening portion. Therefore, each of the heat exchanger fins Even if the pinned pipes are arranged in a plurality of rows of three rows and four rows so as to approach each other, the hairpin pipe located on the inner side is securely and firmly similar to the hairpin pipe located on the outer side. Can be held.

Therefore, even when the diameter of the hairpin tube of the heat exchanger for expanding the tube changes depending on the type of the heat exchanger specification, the tube opening side of the hairpin tube is securely and firmly held. Not only can it be performed, but also the hairpin part can be replaced reliably and instantly without any need for the trouble of having to replace the hook body with a shape that matches the arc shape that is almost the same as the inner circumference of the hairpin part. The hairpin portion can be held without deforming to minimize the shrinkage of the hairpin tube, and furthermore, when the straight tube is inserted not only into the hairpin tube but also through the radiating fins, or when the straight tubes approach each other It is possible to provide an extremely excellent heat exchanger manufacturing apparatus capable of minimizing the shrinkage of the entire length of the straight pipe after expansion even if it is inserted in a zigzag or the like. Has 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 according to the present invention.

FIG. 2 shows a gripper used in the heat exchanger manufacturing apparatus of the present invention. FIG. 2A is an enlarged partial cross-sectional view of a main part, and FIG. (C) and (d) are enlarged partial cross-sectional views of essential parts at the time of pipe expansion.

FIG. 3 shows a holding body used in the heat exchanger manufacturing apparatus of the present invention. FIG. 3A is an enlarged front view of a main part, and FIGS. .

4A and 4B show a holding body used in the heat exchanger manufacturing apparatus of the present invention. FIG. 4A is an enlarged front view of a main part, and FIG.

Figure 5 shows a gripping member used in the manufacturing apparatus of a heat exchanger of the present invention, FIG. (A) and (b) is a fragmentary enlarged partial sectional view of a tube 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

Claims (18)

(57) [Claims] 1. A hairpin tube having a predetermined length inserted through a plurality of radiation fins (6) which are superposed at predetermined intervals.
Holding the hairpin portion (7c) of (7), and then
After a pipe expansion mandrel (2) is press-fitted to a predetermined size from the pipe opening (7b) of (7) to form a pipe expansion section (7d) having a predetermined length, a peripheral surface (7e) of the pipe expansion section (7d) is formed. Gripping body having a plurality of pipe contact members (3f) radially expandable and contractable in a direction intersecting the longitudinal direction of the pipe.
By (3), a predetermined amount of gap (3) is set between each pipe contact member (3f).
a) is gripped so as to be formed, and then the pipe expanding mandrel (2) is advanced to the hairpin portion (7c) side so that the hairpin tube
(7) A method for manufacturing a heat exchanger, comprising expanding a tube to manufacture a heat exchanger. 2. A hairpin tube having a predetermined length inserted through a plurality of heat radiation fins (6) which are superposed at predetermined intervals.
The hairpin portion (7c) of (7), at least a pair of holding bodies (4a)
To hold the hairpin tube (7), and then press-fit an expansion mandrel (2) with a predetermined dimension from the mouth portion (7b) of the hairpin tube (7) to a predetermined length of the expansion portion (7d). Then, the peripheral portion (7e) of the expanded portion (7d) is connected to the mouth portion (7b) of the hairpin tube (7).
A gripping body (3) having a plurality of expandable and contractible tube contact members (3f) protruding from the side is gripped so that a predetermined amount of gap (3a) is formed between the respective tube contact members (3f). And then advancing the mandrel for pipe expansion (2) toward the hairpin portion (7c) to expand the hairpin tube (7) to manufacture a heat exchanger. 3. A hairpin tube having a predetermined length inserted through a plurality of radiation fins (6) which are superposed at a predetermined interval.
The straight section of the pipe body (7a) near the hairpin section (7c) of (7) is held by holding means, and then the mouth section (7) of the hairpin pipe (7) is held.
A pipe-expanding mandrel (2) is press-fitted in a predetermined size from b) to form a pipe-expanding section (7d) having a predetermined length, and then the peripheral surface section (7e) of the pipe-expanding section (7d) is connected to a hairpin pipe (7). A predetermined amount of gap (3a) is provided between each of the tube contact members (3f) by the gripper (3) having a plurality of expandable and contractible tube contact members (3f) protruding from the mouth (7b) side. After holding the hairpin portion (7c) of the hairpin tube (7) with at least a pair of holding members (4a) to hold the hairpin tube (7), the holding means is released. Then, the mandrel for pipe expansion (2) is advanced to the hairpin part (7c) side to expand the hairpin pipe (7) to manufacture a heat exchanger. 4. A hairpin tube inserted into a plurality of radiation fins (6) having a predetermined length and having a predetermined length, and inserted through a plurality of heat radiation fins (6).
The straight tube portion of the tube body (7a) near the hairpin portion (7c) of (7) is held by at least a pair of holding bodies (4a) to hold the hairpin tube (7), and then the tube of the hairpin tube (7) From the mouth (7b), a mandrel (2) for pipe expansion is press-fitted to a predetermined size, and the pipe expansion section (7
d) is formed, and then a plurality of expandable and contractible pipe contact members (3f) are provided which extend from the pipe opening (7b) side of the hairpin pipe (7) to the peripheral surface (7e) of the expanded pipe section (7d). The holding member (3) holds the pipe so that a predetermined amount of gap (3a) is formed between the pipe contact members (3f), and then the pipe expanding mandrel (2) is connected to the hairpin portion (7c).
A method for manufacturing a heat exchanger, comprising: advancing the hairpin tube (7) to the side to expand the hairpin tube (7) to manufacture a heat exchanger. 5. One end (7h) of a straight pipe (7i) inserted with a predetermined length into a plurality of heat radiation fins (6) superposed at a predetermined interval and at least a pair of holding bodies (7). 4a) or hold it by holding means, and then press-fit a pipe expansion mandrel (2) with a predetermined size from a pipe port (7b) on the other end opposite to the one end (7h) to a predetermined length. Along with forming the expanded portion (7d), a plurality of expandable and contractible pipe contact members (3f) that project from the side of the peripheral portion (7e) of the expanded portion (7d) from the tube opening (7b) at the other end are formed. The pipe holding mandrel (2) is gripped so that a predetermined amount of gap (3a) is formed between the respective pipe abutting members (3f) by the gripping body (3), and then the pipe expanding mandrel (2) is connected to the one end side (7h). ) And straight pipe (7i)
A method for manufacturing a heat exchanger, comprising expanding a tube to manufacture a heat exchanger. 6. The holding body (4a) grips an expanded portion (7d).
The hairpin tube (7) or the straight tube (7i) moves in the same direction as the expansion mandrel (2) that is advanced to be pressed into the hairpin tube (7) or the straight tube (7i) gripped by (3). The method according to any one of claims 2 to 5, wherein a tensile force is applied to the heat exchanger. 7. A gripper for holding a peripheral portion (7e) of the expanded portion (7d).
Before the pipe contact member (3f) of (3) is gripped so that a predetermined amount of gap (3a) is formed between the respective pipe contact members (3f), the pipe expanding section (7
The method according to any one of claims 1 to 6, wherein a pressure receiving member (13) corresponding to the pipe contact member (3f) enters into d). 8. A plurality of heat-dissipating fins having a predetermined interval.
Port (7) of a pipe having a predetermined length
From b), press-fit the expansion mandrel (2) with the specified dimensions.
After forming the fixed-length expanded portion (7d), the peripheral surface portion of the expanded portion (7d)
To (7e), the self-scaled radially in a direction intersecting the long side direction of the tube
The holding body (3) having a plurality of existing pipe contact members (3f) is
By moving the gripper (3) forward from the mouth (7b),
The contact member (3f) is externally fitted to surround the peripheral surface portion (7e), and thereafter
The peripheral part (7e) of the expanded part (7d) is grasped via the pipe contact member (3f).
After holding, secure the mandrel for pipe expansion (2).
Characterized in that the pipe is expanded to produce a heat exchanger
Manufacturing method of heat exchanger . 9. The tube contact member (3f) of the gripping body (3) is
Each of the gaps (3a) between the pipe contact members (3f)
(6) by adjusting it according to the diameter of the pipe inserted
And fix the peripheral part (7e) of the expanded part (7d) by grasping it.
The heat exchanger according to any one of claims 1 to 8, wherein
Manufacturing method . 10. A gripping body, wherein said plurality of pipe contact members (3f) are provided.
The gripper guide tube (3c) externally fitted to (3) moves the gripper (3)
Radial expansion and contraction by sliding reciprocally
The heat exchanger according to any one of claims 1 to 9, wherein
Manufacturing method . 11. The pipe expansion device main body (1a) has a predetermined interval.
Hairpins inserted through radiation fins (6)
The hairpin (7c) of the pipe (7) or the radiating fin (6)
Hold at least one end (7h) of the straight pipe (7i)
A pair of holding bodies (4a), held via the holding bodies (4a)
Hold the mouth (7b) or one end (7h) of the hairpin tube (7).
The straight pipe (7i) faces the opening (7b) at the other end of the straight pipe
An expansion mandrel (2) provided, and the expansion mandrel;
(2) is pressed into the pipe opening (7b) with a predetermined size.
When a fixed-length expanded portion (7d) is formed, the peripheral surface of the expanded portion (7d)
Section (7e) from the port (7b) side, and
The expanded portion (7d) is grasped so as to form a predetermined gap (3a) between them.
A gripper having a plurality of expandable and contractable pipe contact members (3f)
(3) A manufacturing apparatus for a heat exchanger, comprising:
Place . 12. The pinch body (4a) has a pinched hairpin.
Of the hairpin (7c) of the pipe (7) or one end (7h) of the straight pipe (7i).
A special feature is that anti-slip means is provided to prevent slip.
The apparatus for manufacturing a heat exchanger according to claim 11, wherein: 13. The holding body (4a) or the pipe expansion device main body (1a).
The hairpin tube at the time of expansion is at least one of
(7) Or a pipe expansion man who advances to be pressed into the straight pipe (7i)
Clamping body moving to move the clamping body (4a) in the same direction as the drell (2)
2. A device according to claim 1, further comprising a moving device.
13. The apparatus for manufacturing a heat exchanger according to 1 or 12 . 14. A heat dissipating unit that is superposed at predetermined intervals.
The hairpin (7c) is held while being inserted through the fin (6).
The hairpin tube (7) at the mouth (7b) or the radiating fin (6).
The other end of the straight pipe (7i) inserted and held at one end (7h)
For expanding the tube, which is provided so as to be able to move in and out opposite to the side port (7b)
The mandrel (2) and the expansion mandrel (2)
Section (7d), which is press-fitted with a predetermined size from the section (7b) and has a predetermined length
When the peripheral surface is formed, it is advanced from the pipe opening (7b) side and
Part (7e) is fitted around the peripheral surface part (7e) so as to surround the part (7e).
Intersect with the longitudinal direction of the pipe to grasp and fix the peripheral surface (7e)
Pipe contact members (3f) that are radially expandable and contractable in
And a gripping body (3) that has been
The pipe contact members (3f) are provided with gaps (3a) between the respective pipe contact members (3f).
To the diameter of the tube inserted through the radiating fins (6).
And adjust it by grasping and fixing the peripheral surface (7e).
Manufacturing equipment for a heat exchanger,
Place . 15. The gripping body (3) is provided in the longitudinal direction of the tube.
A gripper provided on a plate (3d) that can reciprocate along
The guide tube (3c) is fitted outside, and the gripper (3) is in contact with the tube.
The member (3f) is moved by the reciprocating motion of the plate body (3d).
When the gripper guide cylinder (3c) slides on the gripper (3),
The contractor is characterized in that it is configured to expand and contract radially.
A manufacturing apparatus for a heat exchanger according to any one of claims 11 to 14,
Place . 16. The husband of the pipe contact member (3f) of the gripping body (3).
In each case, the expansion section (7d) of the hairpin pipe (7) or straight pipe (7i)
Press the peripheral surface (7e) of the expanded tube (7d) to the contact position
By doing so, the inner circumference of the hairpin tube (7) or straight tube (7i)
Protrusion (3e) that forms the bulging part (7g) for locking is provided on the part (7f)
The method according to any one of claims 11 to 15, wherein:
An apparatus for manufacturing a heat exchanger according to any one of the above . 17. An expansion pipe main body (1a) is provided with an expansion pipe molding machine.
Hairpin tube (7) or straight tube (7i) by press-fitting drel (2)
Into the expanded portion (7d) of the pipe and positioned.
The peripheral surface (7e) of the pipe (7d) is formed with a predetermined gap (3a).
Corresponds to each of the pipe contact members (3f) of the gripper (3) to be gripped
A pressure-receiving member (13) is provided so as to be able to move back and forth facing the port (7b).
11. A structure according to claim 11, wherein
7. The apparatus for manufacturing a heat exchanger according to any one of 6 . 18. Positioning by entering into the expanded portion (7d)
The pressure-receiving member (13) is moved inside the pipe expansion mandrel (2).
It has a cylindrical main body (13a) inserted so that it can move back
On the peripheral surface of the cylindrical main body (13a), there is a bearing that comes into contact with the pipe inner peripheral part (7f).
A pressure body (14) is provided.
An apparatus for manufacturing the heat exchanger according to the above .