JP3400225B2 - Method and apparatus for producing hairpin tube of heat exchanger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a hairpin tube for a heat exchanger and an apparatus therefor, and more specifically, to a distance between legs of a hairpin tube mainly used for a heat exchanger in the vicinity of a bent portion. The present invention relates to a method and an apparatus for manufacturing a hairpin tube that can be corrected to have the same or substantially the same distance as each leg.

[0002]

Conventionally, a hairpin tube used in a heat exchanger is formed into a substantially U shape by a heat transfer tube bending device (not shown), and a hairpin tube insertion device (not shown). ) Is inserted into the heat exchanger main body by simultaneously inserting each of the leg portions facing each other through the bent portion into the insertion hole formed in the heat dissipation fan of the heat exchanger main body through However, for example, the distance between the leg portions on the tip side of the hairpin tube bent through the bending device is such that the leg portions near the bent portion of the hairpin tube formed in the substantially U shape. If it does not match the space between the parts, it will cause a serious work problem that each leg of the hairpin tube cannot be smoothly inserted into the insertion hole formed in the heat dissipation fan of the heat exchanger body, Therefore, the operator always inserts it through the insertion hole of the heat dissipation fan of the heat exchanger body. Whether the distance between the leg portions on the tip side of the hairpin tube is sequentially examined and whether the distance between the leg portions in the vicinity of the bent portion of the hairpin tube formed in the substantially U shape coincides. If the hairpin tube is out of the allowable tolerance, the operator forcibly corrects it by manually pressing or pulling each leg of the hairpin tube, and then correcting the heat dissipation fan of the heat exchanger body. It was inserted through the insertion hole, or was corrected again by adding a bending and curing process using a bending device again, and was inserted through the insertion hole of the heat dissipation fan.

However, in the case where an operator manually corrects by pressing or pulling both legs of the hairpin tube as in the above-mentioned conventional technique, it may be manually operated depending on the diameter and material thickness of the hairpin tube. There has been a serious problem that not only the leg straightening work becomes a heavy labor and a heavy burden is imposed on the worker, but also the work efficiency is lowered.

Therefore, in order to reduce the burden on the operator,
The hairpin tube bent through the bending device is sequentially taken out from the bending device, and thereafter, the distance between the leg portions on the tip side of the hairpin tube is a bending of the hairpin tube formed in the substantially U shape. The hairpin tube, which is inspected to see if it matches the distance between the legs near the section, and which is out of the allowable tolerance, can be bent again into a substantially U shape by using the bending device. , The burden on the operator himself will be greatly reduced, but
Separate steps are required, such as the steps of taking out the hairpin tube once taken out from the folding device and setting it again in the folding device, the work of taking out the hairpin tube after bending from the folding device, and the various operations of transporting it to the folding device. As a result, there is a new drawback in that the whole working process becomes extremely complicated.

However, the present invention solves all of the above-mentioned conventional problems, and even when the heat transfer tube is bent into a hairpin shape through a bending device, the heat transfer tubes are opposed to each other through the bent portion. By applying the correction process of each leg to the bent hairpin tube through the folding device so that the interval of the entire leg is approximately the same as the interval of each leg near the bent part of the hairpin tube, It is an object of the present invention to provide a method and an apparatus for manufacturing a hairpin tube for a heat exchanger, which can be manufactured by correcting the taken out hairpin tube into a state in which it can be easily inserted into the insertion hole of the heat exchanger body. To do.

[0006]

That is, a method for manufacturing a hairpin tube for a heat exchanger according to the present invention is to bend a straight heat transfer tube 6c into a substantially hairpin shape through a bending device 2 and take out the hairpin individually. ,
After that, after supporting or holding the bent portion 6b of the hairpin tube 6 that has been individually taken out, the leg portions 6a, 6a of the hairpin tube 6 are covered.
The vicinity of the bent portion 6b is individually clamped by a pair of clamp bodies 7, 7.
After that, while handling the pair of clamps 7, 7 while handling each leg 6a, 6a,
Each leg 6a, of the hairpin tube 6 by moving to 6a distal end side of the leg portion 6a, 6a of the entire interval legs 6a, 6a
Since the production of Chino bent portion 6b near the hairpin tube with possible correction substantially the same as the spacing, in particular each leg 6a of the hairpin tube 6, the spacing of the tip side of the 6a, leg portion 6a, of 6a The bend
When the spacing is slightly wider or narrower than the space in the vicinity of the portion 6b, each of the leg portions 6a, 6a can be corrected reliably and accurately.

[0007]

[0008]

[0009]

[0010]

Further, according to the method of manufacturing the hairpin tube of the heat exchanger of the present invention, the linear heat transfer tube 6c is bent through the bending device 2 into the bent portion 6b of the hairpin tube 6 which is bent into a substantially hairpin shape. The bent portions 6b of the hairpin tube 6 that are individually taken out after being suspended by the hanging guide body 17 are taken out individually.
Hairpin tube by being received by the support 10 that has moved to
6 is suspended and supported in a substantially vertical direction, and then the hairpin tube
Of the legs 6a, 6a of 6, the vicinity of the bent portion 6b is paired with a sandwiching body.
The hairpin tube 6 is clamped individually by 7 and 7, and then the pair of clamp bodies 7 and 7 are rotated in the same direction to turn the hairpin tube 6 into a substantially horizontal state, and then the bent portion of the hairpin tube 6 is bent. Holding 6b,
After that , handle the pair of clamping bodies 7, 7 with the respective leg portions 6a, 6a.
To the tip side of each leg 6a, 6a so that the distance between the legs 6a, 6a of the hairpin tube 6 is reduced .
Since the hairpin tube is manufactured by correcting it so that it is approximately the same as the distance in the vicinity of the bent portion 6b, the distance on the tip side of each leg portion 6a, 6a of the hairpin tube 6 is particularly equal to that of the leg portion 6a, 6a. My time
Not only can each of the legs 6a, 6a be reliably and accurately corrected when the spacing is slightly wider or narrower than the space in the vicinity of the curved portion 6b , but also the heat transfer tube can be shaped like a hairpin through a bending device. When bent, the hairpin tubes 6 individually taken out from the suspending guide body 17 can be not only subjected to the straightening process but also turned into a horizontal state.
6, a pressing device (not shown) into an insertion hole of a heat radiating fan of a heat exchanger body (not shown) which is set in a horizontal state in advance so as to face the tips of the legs 6a, 6a of the hairpin tube 6. It is also possible to insert the straightened heat transfer tube 6c into the straightened hairpin tube 6 and insert it into the heat exchanger body in one cycle.

[0012] Then, these manufacturing method of the hairpin tube of the heat exchanger of the present invention, each of Kyojitai 7, 7, the hairpin tube 6
Each leg 6a of the hairpin tube 6 while handling each leg 6a of the
Since the tip 6a moves to the tip side, even when the legs 6a, 6a of the hairpin tube 6 are deformed to bend when the heat transfer tube 6c is bent, the legs 6a, 6a are made linear. while forming the legs 6a, legs 6a the spacing of the entire 6a of the hairpin tube 6, out of 6a
The hairpin tube can be manufactured by correcting the gap to be approximately the same as the space in the vicinity of the bent portion 6b .

Further, as an apparatus for carrying out the method for manufacturing the hairpin tube of the above heat exchanger, the present invention is a bending apparatus 2 for bending a linear heat transfer tube 6c into a substantially hairpin shape, and a substantially hairpin shape. Taking out means for individually taking out the hairpin tube 6 bent in the direction, a support 10 for supporting the bent portion 6b of the taken out hairpin tube 6 in a suspended state, and each of the hairpin tube 6
A pair of legs 6a, 6a that individually hold the vicinity of the bent portion 6b.
It consists of Kyojitai 7,7 Prefecture, moreover each of該挟bearing member 7, 7, legs each leg 6a of the hairpin tube 6, the spacing of the entire 6a 6
To correct the gap to be approximately the same as the vicinity of the bent portion 6b of a and 6a, while handling each leg 6a and 6a, move them toward the tip side of each leg 6a and 6a.
Because of the movement of the hairpin tube 6, each leg 6a, 6a
The distance on the tip side of the leg is near the bent portion 6b of the leg portions 6a, 6a
The leg parts 6a, 6a are slightly wider or narrower than
Each of the can be corrected reliably and accurately.

Further, the hairpin tube manufacturing apparatus for a heat exchanger according to the present invention holds the manufacturing apparatus body 1a so that the hairpin tube 6 held by the holding bodies 7, 7 is turned to a substantially horizontal state. Since the rotating means for rotating the whole body 7 and 7 and the holding means for holding the bent portion 6b of the hairpin tube 6 turned to the substantially horizontal state are provided, the hairpin tube 6 turned to the horizontal state is provided. Not only can the leg portions 6a, 6a of the hairpin tube 6 be reliably and accurately corrected while the bent portion 6b of the hairpin tube 6 is held,
A hairpin straightened through a pressing device (not shown) into an insertion hole of a heat radiating fan of a heat exchanger body (not shown) that is set in a horizontal state so as to face the tips of the legs 6a, 6a. The tube 6 can be inserted, and thus the process of manufacturing the straightened hairpin tube 6 from the linear heat transfer tube 6c and inserting it into the heat exchanger body can be automated.

[0015]

[0016]

[0017]

[0018]

[0019]

DETAILED DESCRIPTION OF THE INVENTION

<First Embodiment> An embodiment of a manufacturing apparatus for carrying out the method for manufacturing a hairpin tube for a heat exchanger of the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes a hairpin tube manufacturing apparatus for a heat exchanger, and 1a stands on a base 1b.
In addition, the manufacturing apparatus main body including a support column 1c that can be reciprocally moved along a guide rail 3 arranged along the longitudinal direction of the base 2 and various other members described later is shown.
Is a heat transfer tube 6c disposed in the vicinity of the manufacturing apparatus main body 1a.
The folding device of FIG.

First, in the manufacturing apparatus main body 1a, 4 is an elevating / lowering body attached to a frame 5 rotatably supported by the strut 1 and rotatably supported by the strut 1. As shown in FIG. 3, the body 4 is provided with coil springs so that the leg portions 6a, 6a in the vicinity of the bent portion 6b of the hairpin tube 6 bent into a substantially U-shape can be individually sandwiched by coil springs. A plurality of rotating sandwiching pieces 7a that are urged in the separating direction and axially attached to each other, and the rotating sandwiching pieces 7a are positioned so as to face each of the rotating sandwiching pieces 7a, and that the rotating sandwiching pieces 7a are disposed via a rodless cylinder 7b. Slidable in the parallel installation direction, and each of the rotary holding pieces 7
The four holding bodies 7 composed of a pair of holding arms 7c that form a pair with each a are positioned in two sets on the upper surface and two sets on the lower surface, and the individual leg portions 6a of the four hairpin tubes 6 are arranged. It is provided so that it can be held.

Reference numeral 7d designates a substantially arcuate leg holding portion formed on each of the rotary holding pieces 7a and the holding arms 7c. The turning holding pieces 7a and the holding arms 7c face each other and move toward each other. At this time, the leg portions 6a, 6a of the hairpin tube 6
This is for ensuring a contact area capable of reliably gripping the leg portions 6a when each of them is clamped with a predetermined pressure.

Reference numeral 8 denotes a rod which is inserted into the holding body 7 and which slidably positions two holding bodies 7 at positions vertically intersecting each other. The rods 8 are parallel holding frame bodies. 9 is provided.

Reference numeral 10 denotes four plates which are located above the sandwiching body 7 and are provided so as to face each of the sandwiching bodies 7, and the tip side of which is inclined upward toward the folding device 2 side. 2 shows a support for the hairpin tube 6 in the shape of a circle, and the support 10 is formed with an arcuate portion 10a on the upper side for closely supporting the arcuate bent portion 6b of the hairpin tube 6 in a suspended state. It becomes.

Reference numeral 11 denotes a fiber sensor which is attached to both sides (near the vicinity) of the support body 10 and serves as a detection body for detecting a good support state of the bent portion 6b of the hairpin tube 6, and the fiber sensor A stopper 11 for locking the fiber sensor 11 is provided above and below the sensor 11.
Reference numeral 12 denotes a cylinder for raising and lowering the support, which is provided with a.

Reference numeral 13 denotes a support horizontal moving cylinder for reciprocating the support 10 in the horizontal direction. By operating the cylinder 13, the support position of the hairpin tube 6 can be easily and instantaneously moved. Can be changed.

Reference numeral 14 denotes a hairpin tube detachment preventing body 14a which is provided on the front side of the support body 10 and prevents the hairpin tube 6 supported via the support body 10 from being unintentionally detached from the support body 10. Is a cylinder for moving the hairpin tube disengagement blocking body that can be advanced to the support body 10.

Reference numeral 15 denotes a rotating cylinder for rotating the elevating body 4 by 90 degrees. The rotating cylinder 15
Is integrally attached to the lifting body 4 and
At the same time, it is provided so as to be movable up and down along the pillar 1.

Reference numeral 16 represents a rod-moving cylinder for moving the pillar 1 for moving the pillar 1 along the guide rail 3.

Reference numeral 17 designates a suspension guide body for the hairpin tube 6 which is provided in front of the support column 1 and is inclined toward the support body 10. The suspension guide body 17 has a plurality of suspension guide bodies. In order to take out the hairpin tubes 6 one by one, a set of hairpin tube take-out cylinders 18 having stopper bodies 18a that can be alternately withdrawn and retracted are provided.

Further, in FIG. 4, reference numeral 19 denotes a hairpin tube insertion device of a heat exchanger fixed on the base 2, and the hairpin tube insertion device 19 is provided with the rotation cylinder 15 through the rotation cylinder 15. A pressing plate 20 provided with a substantially wavy pressing portion 20a that can be externally fitted to the bent portion 6b of the hairpin tube 6 in order to press and transport the hairpin tube 6 positioned horizontally on the table 2 in one direction; It is composed of a pressing rod 20b that presses the pressing plate 20 and a cylinder 21 that presses the pressing rod 20b.

22 is a cylinder 1 for horizontally moving the support.
3 shows a moving cylinder for slidably moving the hairpin tube insertion device 19 so as to face the support body 10 that moves via the unit 3.

Next, the case of using the hairpin tube manufacturing apparatus 1 of the heat exchanger having the above-described structure will be described.

First, the bending device 2 is provided with a substantially linear heat transfer tube 6c.
After one end side is fixed and positioned by the fixture 2a, the other end side is rotated to the one end side through the rotating body 2b (arrow D), whereby the hairpin tube 6 is completed. In this case, the distance between the legs 6a, 6a of the bent portion 6b of the hairpin tube 6 (arrow E) and the distance between the tips of the legs 6a, 6a (arrow F) are bent. It is not always the same due to the restoring force of the tubing material, and it always has some variation.

Therefore, the hairpin tubes 6 formed in a hairpin shape are individually taken out from the bending device 2 via the bending device 2, and the bending portion 6a of the hairpin pipe 6 is suspended as a next step. The suspension guide body is sequentially suspended from the suspension guide body 17 and transferred to the manufacturing apparatus main body 1a side, and then the suspended hairpin tube 6 is alternately ejected and withdrawn from the piston 18a of the ejection cylinder 18 to guide the suspension guide body. It is possible to take out the hairpin tubes 6 suspended one by one, but at this time, the hairpin tubes 6 taken out are slid downward one by one because the suspending guide body 17 is inclined. Will be done.

Next, in the hairpin tube 6 which slides through the suspension guide body 17, the support body 10 is moved downward and forward in sequence by operating the support body lifting cylinder 12 as shown in FIG. And (in the order of arrows A, B, and C), the scooped-up portion 6b of the hairpin tube 6 is picked up and taken out to support it in a suspended state. At this time, in synchronization with the support lifting cylinder 12. Since the hairpin tube separation block moving cylinder 14 operates, the cylinder 14
The hairpin tube detachment prevention body 14a provided in the position is located in contact with the front of the support body 10 that supports the hairpin tube 6 in a suspended state, so that the hairpin tube 6 is detached from the support body 10. It is possible to reliably take out the hairpin tube 6 from the suspension guide body 17 while completely blocking it.

Moreover, when the support 10 removes the hairpin tube 6, the removal of the hairpin tube 6 is confirmed by the fiber sensors 11 provided on both sides of the support 10, and each of the hairpin tubes 6 is removed. Legs 6a,
6a is a stopper 11a for locking the fiber sensor 11
Inserted in between.

Next, as described above, the stopper 1 for suspending the fiber sensor 11 is supported by the support 10 in a suspended state.
Each leg 6a, 6a of the hairpin tube 6 fitted between 1a
As shown in FIG. 6, the rodless cylinder 7b provided on the elevating body 4 is operated to slide the holding arm 7c constituting one of the holding bodies 7, and the rotating holding piece 7a is provided with a spring. The legs 7a and 6a in the vicinity of the bent portion 6b of the hairpin tube 6 are each given a predetermined pressure by being rotated in the urging direction by the leg holding portions 7d of the holding arms 7c and the turning holding pieces 7a. Hold and hold.

Then, as shown in FIG. 7, the rotating cylinder 15 is operated to rotate the elevating body 4, and the hairpin tube 6 is positioned in parallel with the base 2 and in a horizontal state. After that, the elevating body 4 is lowered along the column 1 to bring the hairpin tube 6 close to the base 2, and the bent portion 6b of the lowered hairpin tube 6 is inserted into the hairpin tube insertion device 19
The holding means (not shown) for holding the hairpin tube is surely prevented from moving the hairpin tube 6 in the horizontal direction, and then the pillar 1 is moved via the pillar moving rodless cylinder 16. And slides the elevating body 4 and the sandwiching body 7 along the guide rail 3 from the bent portion 6b side of the hairpin tube 6 to the tip side of each leg portion 6a, 6a with a certain distance. By doing so, it is possible to correct the entire distance between the leg portions 6a, 6a of the hairpin tube 6 to be substantially the same as the distance between the leg portions 6a, 6a near the bent portion 6b.

Thereafter, the wavy pressing portions 20a of the pressing plate 20 of the hairpin tube inserting device 19 are brought into contact with the bent portions 6b of the hairpin tube 6 in which the distance between the leg portions 6a, 6a is corrected. After that, by operating the cylinder 21 and pressing the hairpin tube 6 with the pressing plate 20, the two leg portions 6a, 6a of the hairpin tube 6 of the heat exchanger main body (not shown) positioned in a horizontal state in advance are set. The heat radiating fan can be inserted into each of the through holes, so that a series of steps can be automated.

<Second Embodiment> In the above embodiment,
After rotating the hairpin tube 6 to make it horizontal, each leg 6
Although the a and 6a are corrected, the hairpin tube 6 does not necessarily have to be in a horizontal state, and each leg portion 6a near the bent portion 6b of the hairpin tube 6 supported by the support body 10 in a suspended state,
6a is clamped by the clamps 7, 7, and then the clamps 7, 7 are clamped.
Toward the tip of each leg 6a, 6a.
By moving the leg portions 6a, 6a of the hairpin tube 6 to have substantially the same distance as the leg portions 6a, 6a in the vicinity of the bent portion 6b. In this case, in particular, the legs 6a, 6 of the hairpin tube 6 may be used.
When the width of the tip side of a is slightly wider or narrower than the width of the bent portion 6b, there is an advantage that each of the leg portions 6a and 6a can be surely and accurately corrected, but it is not always pinched. The bodies 7 and 7 do not have to move toward the distal ends of the leg portions 6a and 6a with a certain interval, for example, when the holding bodies 7 move toward the distal end directions of the leg portions 6a and 6a. , May face each other and may approach each other or may be separated from each other. In this case, in particular, the distance between the distal ends of the leg portions 6a, 6a of the hairpin tube 6 is different from that of the leg portions 6a, 6a near the bent portion 6b. When the distance is extremely larger or smaller than the space, especially the leg portions 6a, 6a
There is a great advantage that each of the above can be corrected reliably and accurately.

<Third Embodiment> Further, in the above-described embodiment, the holding body 7 is provided with respect to one hairpin tube 6 so as to individually hold each of the legs 6a, 6a of the hairpin tube 6. Although it is configured to be used as a pair, the configuration of the sandwiching body 7 in the present invention is not limited to this, for example, as shown in FIG. The leg portions 6a, 6a are clamped by a pair of holding arms 7c from the outside of the leg portions 6a, 6a, and then the holding arms 7c.
Each leg 6 of the hairpin tube 6 is moved by moving c from the side of the bent portion 6b toward the tip of each leg 6a, 6a, and bringing each of the opposing holding arms 7c closer to each other.
The distance between a and 6a is set to the leg portions 6a and 6a near the bent portion 6b.
May be corrected to be approximately the same as the distance between the legs of the hairpin tube 6 as shown in FIG.
A pair of abutting bodies 7e located inside the leg portions 6a, 6a are spaced apart and abutted on each of the a portions, and then the corresponding abutting body 7e from the bent portion 6b side to the leg portions 6a. , 6a are moved toward the tip end side of the hairpin tube 6 to be separated from each other so that the distance between the leg portions 6a, 6a of the hairpin tube 6 is corrected to be substantially equal to the distance between the leg portions 6a, 6a near the bent portion 6b. Maybe,
In this case, in particular, the leg portions 6a of the hairpin tube 6 are formed such that the distance between the distal ends of the leg portions 6a, 6a is larger or smaller than the distance between the bent portions 6b.
Not only can each of a and 6a be corrected reliably and accurately, but also each of the leg portions 6a and 6a need not be individually clamped by the clamp body 7, so that the mechanism is simplified and manufactured. There is an advantage that the cost can be reduced.

<Fourth Embodiment> Further, in the above embodiment, the hairpin tube 6 is supported in a suspended state by moving the support 10 up and down, but the support means of the present invention is not limited to this. Instead, for example, the hairpin tube 6 may be supported in a suspended state by moving the support body 10 left and right, and the suspension guide body 17 on which the hairpin tube 6 is suspended is moved in a predetermined direction. Therefore, the hairpin tube 6 may be supported in a suspended state, and the point is that the specific supporting means is not limited as long as the hairpin tube 6 can be supported.

<Fifth Embodiment> Further, in the above-described embodiment, the movement of the column 1 is performed by the rodless cylinder 1 for column movement.
However, the movement of the support column 1 according to the present invention is not limited to this. For example, the structure may be such that a chain, a belt or the like is moved by being driven by various electric motors using a reduction mechanism. Well, the point is that the pillar 1 is the base 2
In contrast, if it can be slidably moved, its specific means does not matter.

<Sixth Embodiment> Further, in the above embodiment,
Space saving on the device has been realized by rotating the lifting / lowering body 4 by the cylinder 15, but it is not always necessary to use the cylinder, and an electric motor may be used. In this case, the overall height of the device is lowered. There is an advantage that can be set.

<Seventh Embodiment> Furthermore, in the above embodiment, the sandwiching bodies 7 are alternately provided in the vertical direction, but the installation position of the sandwiching bodies 7 of the present invention is by no means limited to this, and for example, The hairpin tubes 6 may be installed in two rows in the lateral direction, so long as the hairpin tubes 6 can be clamped, the mounting position does not matter, and the clamping force of the clamping body 7 is not limited. Needless to say.

<Eighth Embodiment> Further, in the above embodiment,
The hairpin tube 6 was taken out in a line, but the hairpin tube 6
When the support body 10 is supported by the support body 10, the support body horizontal movement cylinder 13 is driven to reciprocate the support body 10, whereby the hairpin tubes taken out from the suspension guide body 17 are alternately displaced and staggered. It can also be taken out in a shape. Therefore, the hairpin tubes 6 taken out in a zigzag shape are inserted into the heat exchanger (not shown) positioned in a horizontal state with respect to the base 2 in a zigzag-like insertion hole. It has a great advantage that it can be surely inserted through the hairpin tube insertion device 19 of the container.

<Ninth Embodiment> Further, in the above embodiment, the fiber sensor 11 is provided as the detector,
The detector of the present invention is by no means limited to this,
For example, a limit switch, an optical sensor, or the like may be used, and the point is that the type of the detector does not matter as long as it is possible to reliably confirm the quality of the support state of the hairpin tube 6 through the support 10.

<Tenth Embodiment> Further, in the above-mentioned embodiment, each leg of the hairpin tube 6 is corrected to a width substantially the same as the width of the bent portion via the various holding bodies or abutting bodies. However, it is needless to say that the width may not be substantially the same and may be exactly the same as the width of the bent portion, and substantially the same means that the heat exchangers are perforated at a constant pitch. This means that the distance between the leg portions should be corrected within an allowable range that can be inserted into the insertion hole.

[0050]

As described above, according to the present invention, after the bent portions of the hairpin tubes of the heat exchanger that have been individually taken out are respectively supported or held , the bent portions of the legs of the hairpin tubes are bent. Near the section
The pair of gripping members are respectively clamped, and then the pair of gripping members are respectively clamped.
The distance between the legs of the hairpin tube is adjusted by moving the legs to the tip side of each leg while handling the legs.
Correcting is almost the same as the space near the bend, so if the space on the tip side of each leg of the hairpin tube is slightly wider or narrower than the space between the bends, make sure each leg is accurate. To
Moreover, it has the effect that it can be corrected smoothly.

[0051]

[0052]

Further, as an apparatus for carrying out the method for manufacturing the hairpin tube of the heat exchanger, the present invention is a bending apparatus for bending the linear heat transfer tube 6c into a substantially hairpin shape and a substantially hairpin shape. Taking-out means for individually taking out the bent hairpin tube, a support for supporting the bent part of the taken-out hairpin tube in a suspended state, and a bent part of the hairpin tube supported by the support It consists of a holding body that holds each leg in the vicinity,
Moreover, since the sandwiching body moves from the bent portion side to the tip side of both legs in order to correct the distance between the leg portions of the hairpin tube to be approximately the same as the distance between the leg portions in the vicinity of the bent portion, the hairpin is particularly When the distance between the distal ends of the respective leg portions of the tube is slightly wider or narrower than the distance between the bent portions, each of the respective leg portions can be corrected reliably and accurately. Therefore, as in the past, the operator has to forcibly pull or press each leg of the hairpin tube, or have to fold each leg of the hairpin tube again with the folding device, which is a complicated work. It is possible to surely correct each leg of the hairpin tube without requiring any process, and it is possible to significantly improve the production efficiency, which is a great effect.

Therefore, even when the pipe body is bent into a hairpin shape through the bending device, the distance between the tip ends of the leg portions facing each other through the bending portion is set to the bending portion of the hairpin tube. By performing the straightening process of each leg to match the interval on the bent hairpin tube through the bending device, the taken out hairpin tube can be easily inserted into the insertion hole of the heat exchanger body. In order to be able to correct the condition, the process of taking the hairpin tube out of the folding device and inspecting it and setting it again in the folding device, the work of taking out the hairpin pipe after bending from the folding device and carrying it to the folding device It has come to have a special effect that labor can be saved by completely automating different processes such as various works.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an apparatus for manufacturing a hairpin tube of a heat exchanger according to the present invention.

FIG. 2 is a front view of an apparatus for manufacturing a hairpin tube of a heat exchanger.

FIG. 3 is an enlarged plan view of an essential part near the holding body.

FIG. 4 is an enlarged plan view of an essential part showing the hairpin tube insertion device.

5 (a) and 5 (b) are enlarged side views of essential parts showing a taken out state of the hairpin tube.

FIG. 6 is an enlarged plan view of an essential part showing a sandwiched state of the sandwiching body.

FIG. 7 is a side view showing a state during operation of the hairpin tube manufacturing apparatus of the heat exchanger.

FIG. 8 shows another embodiment of the sandwiching body of the apparatus for manufacturing a hairpin tube for a heat exchanger according to the present invention. FIG. 8A is a perspective view showing a state in which both legs are sandwiched from the outside, and FIG. (B) is a perspective view showing a state in which a pair of abutment bodies located between the leg portions are in contact with the leg portions.

[Explanation of symbols]

1 ... Heat exchanger hairpin tube manufacturing equipment 1a ... Device for manufacturing hairpin tube 2. Folding device 4 ... Lifting body 6 ... Hairpin tube 6a ... legs 6b ... Bent part 7 ... Holder 7a ... Rotating holding piece 7b ... Rodless cylinder 7c ... Clamping arm 10 ... Support 11 ... Detector (fiber sensor) 19 ... Hairpin tube insertion device

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Claims (4)

(57) [Claims] 1. A straight heat transfer tube (6c) is bent into a substantially hairpin shape through a bending device (2) and taken out individually, and then the bent portion of the hairpin tube (6) taken out individually. After supporting (6b) or holding, the legs (6a), (6a) of the hairpin tube (6)
The vicinity of the bent portion (6b) is individually clamped by a pair of clamps (7), (7), and then the pair of clamps (7), (7) are connected to the legs (6a),
(6a) a squeezing while leg portions (6a), legs legs (6a), the total distance (6a) of the hairpin tube by moving to the distal side (6) of (6a) (6a ) And (6a), the hairpin tube is manufactured by correcting the hairpin tube so that it has substantially the same spacing as the vicinity of the bent portion (6b) . 2. A bent portion of a hairpin tube (6) in which a linear heat transfer tube (6c) is bent into a substantially hairpin shape through a bending device (2).
(6b) Suspended in the suspension guide body (17) one by one, taken out individually, and then bent parts of the hairpin tube (6) taken out individually
(6b) is received by the support (10) that has moved to the bent portion (6b) to suspend and support the hairpin tube (6) in a substantially vertical direction, and then the hairpin tube (6) Each leg (6a), (6a)
The vicinity of the bent portion (6b) is individually sandwiched by a pair of sandwiching bodies (7), (7), and then the pair of sandwiching bodies (7), (7) are rotated in the same direction to move the hairpin. After the tube (6) is turned to a substantially horizontal state, the bent portion (6b) of the hairpin tube (6) is held, and then the pair of clamps (7) and (7) are attached to each leg ( Handles 6a) and (6a)
While moving to the tip side of each leg (6a), (6a), the distance between the leg parts (6a), (6a) of the hairpin tube (6) is reduced.
A method for manufacturing a hairpin tube for a heat exchanger, which comprises correcting a hairpin tube so that the distance between the legs (6a), (6a) in the vicinity of the bent portion (6b) is approximately the same. 3. A bending device (2) for bending a linear heat transfer tube (6c) into a substantially hairpin shape, and an extraction means for individually extracting the hairpin tube (6) bent into a substantially hairpin shape. A support (10) for supporting the bent portion (6b) of the taken out hairpin tube (6) in a suspended state, and the leg portions (6a) of the hairpin tube (6),
It is composed of a pair of holding bodies (7) and (7) which individually hold the vicinity of the bent portion (6b) of (6a) , and further, the holding bodies (7) and (7). Check the distance between each leg (6a) and (6a) of the hairpin tube (6).
Each leg part (6a), (6a) is handled in order to correct the gap to be approximately the same as the vicinity of the bent part (6b) among the leg parts (6a), (6a).
An apparatus for manufacturing a hairpin tube of a heat exchanger, which is configured to move to the tip side of (6a) and (6a) . The method according to claim 4, wherein the production apparatus main body (1a), Kyojitai
(7), rotation means for rotating the whole holding body (7), (7) so as to turn the direction of the hairpin tube (6) held by the (7) to a substantially horizontal state, and a substantially horizontal state Hairpin tube turned to (6)
4. The apparatus for manufacturing a hairpin tube for a heat exchanger according to claim 3 , further comprising holding means for holding the bent portion (6b).