JPH1085878A - Holding body of insertion pipe for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix even a plurality of rows of hair-pin pipes by providing a plurality of pipe abutting members which can be reciprocally housed over a mandrel for expansion to be press fitted from a pipe mouth part of a pipe to be inserted in a radiation fin and can be housed from the pipe mouth part in an expandable manner in the radial direction of the pipe. SOLUTION: A mandrel 2 for expansion is press fitted from a pipe mouth part 7b to form an expanded part 7d of the prescribed length, and an expandable pipe abutting member 3f of a holding body 3 is advanced to be housed over a circumferential surface part 7e. When a holding body guide cylinder 3c is advanced in the direction (c), an upwadly inclined surface 3b of the pipe abutting member 3f is pressed to contract the pipe abutting member 3f in the axial direction of the mandrel 2 for expansion, and the circumferential surface part 7e is held thereby. A moving device holding a hair-pin part is simultaneously and slightly moved in the same direction to apply the tension while the mandrel 2 for expansion is advanced. Even a plurality of rows of hair-pin pipes, e.g. of three or four rows in which the pitch of the hair-pin pipes is extremely narrow can be individually fixed by the holding body 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat exchanger in which a plurality of heat radiating fins of a superposed heat exchanger are expanded so as to keep the entire length of the tubes substantially equal to that before the expansion. It is used in a heat exchanger manufacturing apparatus that can be formed integrally with the fins, and even if the inserted tubes are close to each other and are in a plurality of three rows or four rows,
Also, even if the diameter of the pipe to be expanded varies depending on the type of heat exchanger specification, the pipe opening side of the pipe located inside the heat exchanger is securely and firmly connected to the heat exchanger. The present invention relates to a heat exchanger insertion tube gripper that can be held in the same manner as a tube mouth side of a tube located on the outside.

[0002]

2. Description of the Related Art Conventionally, for example, the total length of a pipe to be expanded is
As a method of manufacturing a heat exchanger that can be kept substantially equal to that before expansion, there is a method disclosed in Japanese Patent Application Laid-Open No. 63-188433.

That is, the one described in the above publication is shown in FIG.
As shown in the figure, a large number of hairpin tubes 7 are passed through a large number of heat-radiating fins 6 polymerized at a predetermined interval. In the method of inserting the mandrel 2 and fixing the hairpin tube 7 and the radiation fin 6, the hairpin portion 7c of the hairpin tube 7 is fixed by the hook body 10 which does not move to the tube opening 7b. In this state, the mandrel 2 for expanding the tube is inserted from the mouth 7b of the hairpin tube 7 and the tube mouth 7b side is expanded beyond the radiation fin 6 at one end, and the expanded portion 7d is replaced with the hairpin 7c. Is fixed in the through hole 9 of the clamp 8 that does not move to the hairpin tube 7, and the subsequent insertion of the mandrel 2 for expanding the hairpin tube 7 into the hairpin tube 7 is performed without moving the fixing portion of the hairpin tube 7 by the clamp body 8 to the hairpin portion 7 c side. The fixing part of the hairpin tube 7 by restraining and the hook body 10 Which is a method of performing in a state of being restrained without moving the Kanguchi 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, in the above method, as shown in FIG. 4 (b), the mouth portion 7b of the hairpin tube 7 is fixed in the through hole 9 of the clamp 8, so that, for example, the radiation fins 6 are staggered. If the number of hairpin tubes 7 to be inserted is three rows, four rows, or a plurality of rows, the hairpin tubes 7 located inside cannot be fixed by the clamps 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. There have been various problems that the mouth 7b side cannot be fixed.

That is, the present invention relates to a case where the hairpin tubes and the straight tubes inserted 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. Also, even if the diameter of the pipe to be expanded varies depending on the type of specification of the heat exchanger, the hairpin pipe located straight inside and the hairpin pipe located straight inside and the hairpin pipe located straight outside can be reliably used. To provide a gripper for a heat exchanger insertion tube used in a heat exchanger manufacturing apparatus so that the tube mouth side of the tube can be securely and firmly fixed while being held in the same manner as a straight tube or a straight tube. Is the subject.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned various problems, the present invention has invented a gripper for a heat exchanger insertion tube used in a completely new heat exchanger manufacturing apparatus. It was taken.

That is, the present invention is reciprocatingly movable to the expansion mandrel 2 which is provided in the heat exchanger manufacturing apparatus 1 and which can be press-fitted from the pipe opening 7b of the pipe inserted through the radiation fin 6 of the heat exchanger 5. A plurality of tube abutting members 3f which can be fitted to the outside, and which can be radially expanded and contracted in a direction intersecting with the longitudinal direction of the tube, and which can be fitted from the tube opening 7b side of the tube. In the case where the hairpin tubes 7 inserted into the radiating fins 6 of the heat exchanger are arranged in a predetermined pattern so as to form a plurality of rows, such as three rows or four rows, in a staggered manner with a close interval between them. However, there is an advantage that the hairpin tube 7 located on the inner side can be securely and firmly held similarly to the hairpin tube 7 located on the outer side.

Further, according to the present invention, when each of the pipe contact members 3f is contracted toward the pipe, a gap 3a is formed between the respective pipe contact members 3f to hold the pipe mouth 7b of the pipe. Therefore, even when the diameter of the hairpin tube 7 of the heat exchanger 5 for expanding the tube changes depending on the type of the specification of the heat exchanger 5, the tube opening 7b side of the hairpin tube 7 is securely and firmly provided. Has the advantage that can be fixed.

Further, the present invention relates to a heat exchanger manufacturing apparatus 1 in which the holding body 3 is reciprocated in the same direction as the reciprocating direction of the pipe expanding mandrel 2 provided in the heat exchanger manufacturing apparatus 1. Attached to the provided plate body 3d, and the plate body
A gripping body guide cylinder 3c for radially expanding and contracting the tube contact member 3f through the reciprocation of 3d is configured to be slidably fitted outside, and furthermore, on the outer periphery of each of the tube contact members 3f. Is an inclined surface facing upward toward the distal end of the mandrel 2 for pipe expansion.
3b, the grasping body guide cylinder 3c is moved forward only in the same direction as the advancing direction of the expanding mandrel 2 via the plate body 3d, and the grasping body guide cylinder 3c is connected to each of the tube contact members. By pressing the upwardly inclined surface 3b of 3f, each pipe contact member 3f is pressed.
Can be contracted in the axial direction of the expansion mandrel 2.

Further, the present invention provides a pipe contact member 3f,
Since the projection 3e is protruded toward the pipe on which the pipe contact member 3f is fitted, the peripheral surface 7e of the hairpin pipe 7 can be gripped more firmly, and thus the pipe port at the time of expanding the pipe can be held. This has the advantage that the reference position of the portion 7b can be reliably set, and the pipe expanding operation can be performed with higher accuracy.

Further, according to the present invention, the hairpin tube 7 inserted into the radiating fins 6 of the heat exchanger 5 can be fitted from the mouth 7b side of the hairpin tube 7, and the mouth of the hairpin tube 7 is adjusted to the diameter of the hairpin tube 7. Since the plurality of gaps 3a located on the circumference of the pipe on the 7b side are automatically adjusted and shrunk in the axial direction of the pipe to hold and fix the pipe opening 7b, the pipe diameter of the pipe to be expanded is heated. Even if it changes depending on the type of exchanger specifications, securely and firmly hold the hairpin tube or straight tube located on the inner side in the same way as the hairpin tube or straight tube located on the outer side, and securely In addition, there is an advantage that the pipe mouth side of the pipe can be firmly fixed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Hereinafter, a second embodiment of the present invention will be described in which the gripper of the heat exchanger insertion tube according to the present invention is used in a heat exchanger manufacturing apparatus capable of keeping the entire length of a pipe to be expanded substantially equal to that before expansion. An embodiment will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a heat exchanger manufacturing apparatus, 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 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 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 abutting 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.

Reference numeral 4 denotes a pair of clamps provided on the base 1b and 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 using the gripper of the heat exchanger insertion tube according to the first embodiment of the present invention has the above-described configuration. A case in which a mandrel for expanding a pipe is press-fitted into the pipe is 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 portion 7c of the hairpin tube 7 of the heat exchanger 5 is advanced 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 fitted to the four pipe contact members 3f is advanced (arrow C) in the same direction as the advancing direction of the pipe 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 gripped and held with a predetermined amount of gap 3a between the respective tube contact members 3f. Is moved slightly toward the hairpin portion 7c of the hairpin tube 7 while the holding member moving device 4 having the holding member 4a holding the hairpin portion 7c is slightly moved in the same direction as the advancing direction of the expanding mandrel 2. By retracting) and applying a pulling force, the total length of the hairpin tube 7 is reduced in consideration of not only the contraction of the hairpin tube 7 at the time of expansion, but also the slippage of the hairpin tube 7 from the tube contact member 3f and the holding member 4a. There is an advantage that a heat exchanger in which the temperature is minimized 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 apart 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 extending from the direction of the mouth 7b can be individually fixed.

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 hold 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 abutting members 3f. Not only can the hairpin tube 7b side of the hairpin tube 7 be held securely and firmly by automatically adjusting through the gap 3a generated between the contact members 3f, but also the hairpin portion 7c, It is absolutely necessary without any inconvenience that it has to be replaced with a hook body having a shape that matches the same arc shape as the inner circumference of the hairpin portion 7c,
In addition, since the tongue-shaped concave portion 4g provided on the holding body 4a can be held and held in a close contact state without being deformed, the entire length of the hairpin tube 7 used for expanding the tube and the hairpin tube 7 are not deformed. Even if the outer diameter of the heat exchanger 5 is changed according to the specification of the heat exchanger 5, there is an advantage that a desired expansion can be performed on the heat exchanger without changing the apparatus itself.

<Second Embodiment> In the above embodiment, four tube contact members 3f of the gripping body 3 are provided along the longitudinal direction of the tube expanding mandrel 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 grasping and holding 7e, it is possible to reliably set the reference position of the pipe opening 7b at the time of pipe expansion, and there is an advantage that pipe expansion work with higher accuracy can be performed.

<Third 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 amount of 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. For example, as shown in FIG. 3A, the expanding mandrel 2 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.

Further, in the above embodiment, the heat exchanger 5
The hairpin tube 7 is inserted into the hairpin tube 7 and the hairpin tube 7 is configured to hold the hairpin portion 7c through at least a pair of holding members. However, the present invention is not limited to this, and for example, the hairpin tube 7 Tube body near hairpin 7c of 7
The straight pipe portion of 7a is held by holding means (not shown), and then the expansion mandrel 2 is press-fitted from the mouth portion 7b of the hairpin tube 7 for a predetermined distance to form a expansion portion 7d of a predetermined length. A predetermined amount 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 the expanded tube portion 7d. After holding the hairpin portion 7c of the hairpin tube 7 with at least a pair of holding members 4a and holding the hairpin tube 7, the straight tube portion of the tube main body 7a is held. The holding means is released, and then the pipe expanding mandrel 2 is released.
May be advanced to the hairpin portion 7c side to expand the hairpin tube 7 to manufacture a heat exchanger.

Accordingly, 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.

Further, in the above embodiment, the heat exchanger 5
The hairpin tube 7 is inserted into the heat exchanger 5, but the hairpin tube 7 is not necessarily limited to the hairpin tube 7. For example, a straight tube having a certain length is inserted into the heat exchanger 5, and one end of the straight tube is Then, the mandrel 2 for expanding the pipe is press-fitted from the port 7b at the other end opposite to the one end, and is expandable and contractable. The holding member 3 having a plurality of tube contact members 3f may be held so that a predetermined amount of gap 3a is formed between the respective tube contact members 3f.

However, the point is that a heat exchanger insertion tube holding body used in a heat exchanger manufacturing apparatus capable of keeping the entire length of the expanded pipe substantially equal to that before the expansion is provided in the heat exchanger manufacturing apparatus. Can be reciprocally fitted to a pipe expansion mandrel that can be press-fitted from the pipe mouth of the pipe inserted into the heat radiation fins of the heat exchanger, and can be radially expanded and contracted in a direction crossing the longitudinal direction of the pipe. It is only necessary to have a plurality of pipe contact members that can be fitted from the pipe mouth side of the pipe, and the entire length of the pipe to be expanded to use the gripping body is substantially equal to that before the expansion. The apparatus for manufacturing the heat exchanger that can be used is not necessarily a horizontal apparatus, but may be a vertical apparatus, and furthermore, the number, arrangement and arrangement of grippers and grippers having a plurality of pipe contact members. Needless to say, the location is not limited.

[0035]

As described above, the present invention is provided in a heat exchanger manufacturing apparatus, and reciprocates to a pipe expansion mandrel which can be press-fitted from a pipe opening of a pipe inserted into a heat radiation fin of the heat exchanger. Since it has a plurality of pipe contact members which can be freely fitted outside, and which can be radially expanded and contracted in a direction intersecting with the longitudinal direction of the pipe, and which can be fitted outside from the pipe mouth side of the pipe. A case where the hairpin tubes inserted into the radiating fins of the heat exchanger are arranged in a predetermined pattern so as to form a plurality of rows such as three rows or four rows in a staggered manner by making the intervals close to each other. In addition, 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 when each tube contact member shrinks to the tube side, Since a gap is formed between the respective pipe contact members to hold the pipe mouth of the pipe, Even if the pipe diameter of the hairpin tube of the heat exchanger for performing the tube has changed the type specifications of the heat exchanger, certainly, and firmly be fixed to the tube inlet side of the hairpin tube. Therefore, the production efficiency of the heat exchanger having a plurality of rows of insertion patterns can be significantly improved by using the heat exchanger manufacturing apparatus, which can keep the entire length of the expanded pipe substantially equal to that before the expansion. As a result, it is possible to provide an extremely excellent gripper for the heat exchanger insertion tube, which has a special effect.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger manufacturing apparatus using a gripper of a heat exchanger insertion tube according to the present invention.

FIG. 2 shows a state of use of a gripping body of a heat exchanger insertion tube of the present invention, wherein (a) is an enlarged partial cross-sectional view of a main part, (b) is an enlarged view of a main part, and (c) and (d). 2 is an enlarged partial cross-sectional view of a main part at the time of pipe expansion.

FIGS. 3A and 3B show a state of use of a gripper of the heat exchanger insertion tube of the present invention, and FIGS.

4A and 4B show a conventional heat exchanger manufacturing apparatus, wherein FIG. 4A is an enlarged front view at the time of pipe expansion, FIG. 4B is a perspective view of a clamp, and FIG.
Is a perspective view showing another embodiment of the clamp.

[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 (6)

[Claims] 1. A tube mouth portion of a tube provided in a heat exchanger manufacturing device (1) and inserted through a radiation fin (6) of a heat exchanger (5).
A pipe mandrel (2) press-fittable from (7b) can be reciprocally fitted to a pipe-expanding mandrel (2), and can be radially expanded and contracted in a direction intersecting the longitudinal direction of the pipe, and a pipe mouth (7b) of the pipe. A holding body for a heat exchanger insertion tube, comprising a plurality of tube contact members (3f) that can be fitted from the side. 2. A gap (3a) is formed between each of the tube contact members (3f) when each of the tube contact members (3f) shrinks toward the tube, and a pipe mouth portion of the tube is formed. The holding body for a heat exchanger insertion tube according to claim 1, wherein (7b) is held. 3. The heat exchanger for reciprocating in the same direction as a reciprocating direction of a pipe expanding mandrel (2) provided in the heat exchanger manufacturing apparatus (1). A gripping body guide attached to a plate body (3d) provided in the manufacturing apparatus (1) and for expanding and contracting the pipe contact member (3f) radially through reciprocation of the plate body (3d). 3. The structure as claimed in claim 1, wherein the tube (3c) is slidably fitted to the outside.
A holding body for the heat exchanger insertion tube according to the above. 4. An outer peripheral surface of each of the pipe contact members (3f) has an inclined surface facing upward toward a tip end of a pipe expanding mandrel (2).
The holding body for a heat exchanger insertion tube according to claim 3, wherein (3b) is formed. 5. A projection (3e) is provided on each of the pipe contact members (3f) so as to protrude from a pipe side on which the pipe contact members (3f) are fitted. Item 5. A gripper for a heat exchanger insertion tube according to any one of Items 1 to 4. 6. A pipe which can be fitted from the pipe opening (7b) side of a pipe inserted into a heat radiation fin (6) of a heat exchanger (5), and has a pipe opening (7b) corresponding to the diameter of the pipe. The gaps (3
a) is automatically adjusted to shrink in the axial direction of the pipe,
(7b) A holding body for a heat exchanger insertion tube, which holds and fixes (7b).