JPS6235525Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat exchanger tube manufacturing apparatus, and more particularly, to improve heat conduction of the heat exchanger tube, a heat exchanger tube is formed with spiral grooves on its outer peripheral surface and corrugated into a corrugated cross section. The present invention relates to a heat tube manufacturing device.

Conventionally, as this type of manufacturing apparatus, one shown in FIG. 4 has been proposed.

That is, the manufacturing apparatus places a support body 54 having a corrugated roll 53 on a rotary disc 52 having a heat exchanger tube insertion hole 51 in the center thereof.
Three pieces are supported at equal intervals in the circumferential direction, each of which is freely movable in the radial direction, and on the rotary disk 52,
A swinging lever 56 that swings due to the centrifugal force caused by the rotation of the rotary disk 52 is pivotally supported on each support 54, and each swing lever 56 and each support 54 are connected via a connecting pin 56b. The rotary disk 52 is directly interlocked with the rotary disk 52, and the swinging lever 56 is swung in the direction A in FIG. At the same time, the support body 54 is engaged with the stopper 57 via the connecting pin 56b of the lever 56.
is pushed toward the center of the rotary disk 52, thereby causing the corrugated roll 53 to bite into the heat transfer tube inserted into the insertion hole 51, thereby making a predetermined cut width in the heat transfer tube. The push groove is formed in a spiral shape.

By the way, in the conventional device configured in this way, the swing lever 56 and the support body 54 are directly connected via the connection pin 56b, so the rotary disk 5
2, the centrifugal force acting on the swing lever 56 decreases, or the heat exchanger tubes have manufacturing irregularities in hardness, and the hardness locally becomes hard. When the reaction force from the heat exchanger tubes acting radially outward increases, the relationship between the magnitude of the centrifugal force acting on the swing lever 56 and the magnitude of the reaction force acting on the support body 54 from the heat exchanger tubes each time increases. Therefore, the cutting width of the push groove formed in the heat transfer tube becomes small, and as a result, there is a problem in that the cutting width varies.

The present invention was devised in view of the above-mentioned conventional problems, and the object thereof is to provide a slide body that allows the support body and the swing lever to be moved only in a direction substantially orthogonal to the moving direction of the support body. By providing a cam between the slide body and the support body that can move the support body in the radial direction and restrict and lock the movement of the support body, the rotary disk Even if the centrifugal force due to the rotation of the heat exchanger tube fluctuates, or even if the hardness of the heat exchanger tube is uneven, the cutting width of the push groove formed in the heat exchanger tube can always be kept constant.

Accordingly, the present invention has a structure in which a support body having a corrugated roll is supported on a rotary disk having an insertion hole for the heat transfer tube in the center thereof so as to be freely movable in the radial direction with respect to the insertion hole, and A slide body movable in a direction substantially orthogonal to the movement direction of the support body is provided outward in the movement direction of the support body, and one of the slide body and the support body is provided with a slide body movable in a direction substantially perpendicular to the movement direction of the support body. A cam surface having a length in a direction is provided on the other side, and an engaging portion that engages with the cam surface is provided on the other side so that the support body is moved by the movement of the slide body. A swing lever that swings due to centrifugal force due to the rotation of is supported, and the lever is interlocked with the slide body, and when the swing lever swings due to the centrifugal force, the gap between the slide body and the support body is Due to the engagement between the cam surface and the engaging portion provided at This makes it possible to prevent it from moving outward in the radial direction due to fluctuations, etc.

Hereinafter, embodiments of the present invention will be described based on the drawings.

What is shown in FIGS. 1 to 3 is a manufacturing apparatus for corrugated heat exchanger tubes according to the present invention, and the structure thereof will be briefly described below.

The manufacturing device has an insertion hole 2 through which the heat exchanger tube 1 is inserted.
A rotary shaft 3 having a rotary shaft 3 is supported by two bearings 4 and 5, and a rotary disk 8 having three supports 7 having corrugated rolls 6 is fixed to one end of the rotary shaft 3, while the other end is A pulley 9 connected to a power source (not shown) via a V-belt (not shown) is fixed to the motor.

The rotating disk 8 is provided with an insertion hole 10 in the center thereof through which the heat exchanger tube 1 is inserted, and the three supports 7 are arranged at equal intervals in the circumferential direction and with respect to the insertion hole 10. Each swing lever 11 is supported to be freely movable in the radial direction, and each swing lever 11 swings by centrifugal force due to the rotation of the rotary disk 8 and is connected to a shaft via a pin 12 outward in the direction of movement of each of these supports 7. Support,
Further, as will be described in detail later, slide bodies 13 are provided for interlocking each of these swing levers 11 and each of the supports 7.

Reference numerals 14 and 15 are stoppers that restrict the swinging range of the swinging lever 11, that is, the stop side position and the drive side position, and 16 is a return spring that returns the lever 11 to the stop side position.

In addition, each of the corrugated rolls 6 is slightly inclined with respect to the direction perpendicular to the rotating shaft 3 in order to form one spiral press groove 1a in the heat exchanger tube 1, and each of the three The mounting positions of the rolls 6 are also appropriately shifted in the axial direction of the rotating shaft 3 on the support body 7.

In the manufacturing apparatus configured as described above, the slide body 13 is disposed radially outward of each support body 7.
is provided movably in a direction perpendicular to the moving direction of each of the supports 7, and has a length along the moving direction of the slide body 13 on the surface of the slide body 13 on the side facing the support body 7. cam surface 13 with
On the other hand, an engaging portion consisting of a roller 7a that engages with the cam surface 13a is provided on the support body 7 side, and the slide body 13 and the swing lever 11 are connected via a connecting pin 11a. and the slide body 13 is moved by the swinging portion 11b of the swinging lever 11 in the radial direction,
This is done to move the support body 7 in the radial direction.

Specifically, the slide body 13 is held at both ends by a pair of rollers 17 and 18 fixed to the rotary disk 8 via a fixed plate 22, and is moved perpendicularly to the moving direction of the support body 7. It can only be moved in one direction.

Further, the cam surface 13a has a concave stop side portion 13.
b, and a convex driving side portion 13 with a substantially flat top.
c is formed along the moving direction of the slide body 13. Further, the slide body 13 is formed with a recess 13d in the form of a long hole extending in the radial direction, and a coupling pin 11a extending from the swing lever 11 is fitted into the recess 13d, thereby controlling the swing of the swing lever 11. As a result, the coupling pin 11a rotates about the pin 12 as a fulcrum (arrow C in FIG. 1), thereby moving the slide body 13 in the directions of arrows A and B in FIG.

The fixing plate 22 has an elongated hole (not shown) extending in the radial direction, and is fixed to the rotary disk 8 by inserting bolts into the elongated hole. By shifting the position in the radial direction, the cutting width of the press groove 1a of the corrugated roll 6 into the heat exchanger tube 1 can be adjusted.

Further, the support body 7 is fitted into the guide body 21 fixed to the rotary disk 8 so as to be freely movable in the radial direction. , the support 7
A holder 19 fixed to the rotary disk 8 is inserted into the middle part of the support body 7, and the holder 19 and the support body 7 are connected to each other.
A spring 20 that presses the support body 7 radially outward is disposed between the roller 7a and the cam surface 13a so that the roller 7a is always in contact with the cam surface 13a.

Thus, when the rotary disk 8 is stopped, the swing lever 11 is pulled by the return spring 16 and is at the stop side position where the swing part 11b abuts the stopper 14, and at that time, the The roller 7a is attached to the cam surface 1 of the slide body 13.
3a is engaged with the stop side portion 13b.

When the rotating disk 8 rotates due to the rotation of the rotating shaft 3, a centrifugal force acts on the swinging lever 11, and the lever 11 moves against the return spring 16 using the pin 12 as a fulcrum. The swinging portion 11b moves radially outward. At the same time, the connecting pin 11a rotates clockwise in FIG. 1, and the slide body 13 moves in the direction of arrow A in FIG. Along with this, the engagement position of the cam surface 13a with the roller 7a shifts from the stop side portion 13b to the driving side portion 13c, thereby pushing the support body 7 toward the insertion hole 2 side, The corrugated roll 6 begins to bite into the heat exchanger tube 1 inserted into the insertion hole 2. Then, the swing lever 11 moves further in the radial direction against the reaction force generated by the roll 6 biting into the heat exchanger tube 1 and the tension of the return spring 16. It comes into contact with the stopper 15. Along with this, the slide body 13 also moves further in the A direction, and the roller 7a moves toward the drive side portion 13 of the cam surface 13a.
c, that is, the roll 6 engages with the flat surface, and as a result, the roll 6 bites into the heat exchanger tube 1 by a predetermined amount, forming a helical push groove 1a with a predetermined cutting width.

Then, once the roller 7a is moved to the cam surface 1
3a, the radially outward reaction force that the support body 7 receives from the heat exchanger tube 1 acts perpendicularly to the moving direction of the slide body 13, and the reaction force is All slide bodies 13
The force acts on the rollers 17 and 18 that sandwich the slide body 13 via the oscillation lever 11, and is not transmitted to the swing lever 11 at all.

Furthermore, even if rotational unevenness occurs in the rotary disk 8, its rotational speed decreases, the centrifugal force acting on the swing lever 11 decreases to some extent, and the slide body 13 moves to the left in FIG. 2b. Even if it moves a little, the amount of movement is absorbed by the flat surface of the driving side portion 13c, so the cutting width does not change and can always be kept constant.

Therefore, the push groove 1a of a predetermined width can be reliably formed in the heat exchanger tube 1.

Further, even if the hardness of the heat exchanger tube 1 is uneven and the reaction force directed outward in the radial direction that the support body 7 receives from the heat exchanger tube 1 changes, the roller 7a and cam surface 13a
By engaging with the drive side portion 13c, the support body 7 can be reliably held in a predetermined position, and from this point as well, variations in the cutting width of the push groove 1a can be reliably prevented.

As described above, according to the present invention, the support body 7 having the corrugated roll 6 is moved in the radial direction with respect to the insertion hole 10 on the rotary disk 8 having the insertion hole 10 for the heat transfer tube in the center. The support body 7 is supported freely and outwardly in the direction of movement of the support body 7.
A slide body 13 movable in a direction substantially perpendicular to the direction of movement of the slide body 13 is provided, and one of the slide body 13 and the support body 7 has a cam surface 13a having a length in the direction of movement of the slide body 13. The other side is provided with an engaging portion 7a that engages with the cam surface 13a so that the support body 7 is moved by the movement of the slide body 13, while the rotary disk 8 is provided with an engaging portion 7a that engages with the cam surface 13a. Swinging lever 11 that swings due to centrifugal force caused by
, and move the lever 11 to the slide body 13.
By devising the shape of the cam surface 13a, the rotary disk 8 rotates, and once the push groove 1a reaches a predetermined cutting width, the heat exchanger tube 1 is connected to the support 7. The reaction force acting outward in the radial direction can be fully supported by the slide body 13 without acting on the swing lever 11, and as a result, uneven rotation occurs in the rotary disk 8 or the heat exchanger tube Even if the heat exchanger tube 1 has uneven hardness, the heat exchanger tube 1 has a predetermined cut width.
a can always be formed.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the main parts of an embodiment of the present invention;
Fig. 2a is a partial front view showing the same operating state, Fig. 2b is a partially enlarged explanatory view, Fig. 3 is a partial side sectional view showing the same operating state, and Fig. 4 is an explanatory diagram showing a conventional example. . 6...Corrugated roll, 7...Support,
7a...Roller (engaging portion), 8...Rotary disk, 10
...Insertion hole, 11 ... Swing lever, 13 ... Slide body, 13a ... Cam surface.

Claims (1)

[Scope of utility model registration request] This is a manufacturing apparatus for heat exchanger tubes that forms push grooves on the outer circumferential surface and corrugates them into a corrugated cross-section, and includes a rotary disk 8 having a through hole 10 for the heat exchanger tubes in the center, and a support with a corrugating roll 6. A slide that supports the body 7 so as to be freely movable in the radial direction with respect to the insertion hole 10 and is movable outward in the direction of movement of the support 7 in a direction substantially orthogonal to the direction of movement of the support 7. A body 13 is provided, a cam surface 13a having a length in the moving direction of the slide body 13 is provided on one of the slide body 13 and the support body 7, and an engaging portion that engages with the cam surface 13a on the other side. 7a is provided so that the support body 7 is moved by the movement of the slide body 13, and a swing lever 1 is provided on the rotary disk 8, which swings by the centrifugal force caused by the rotation of the rotary disk 8.
1, and move the lever 11 to the slide body 1.
3. A heat exchanger tube manufacturing apparatus characterized in that the apparatus is interlocked with 3.