JPH0221891B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a heat exchanger used in an air conditioner, etc., and in particular, a heat exchanger in which holes are formed in the fins of the heat exchanger and a U-pipe is inserted into the hole. The present invention relates to a U-pipe tip forming device for processing the tip of a U-pipe to be inserted into a hole in a heat exchanger to be manufactured so that the tip can be easily inserted into the hole.

[Technical background of the invention and its problems]

Heat exchangers used in air conditioners, etc.
As shown in the figure, a fin main body 1 is formed by stacking a large number of fin plates, and both ends 4 of a U-shaped U pipe 3 are inserted into a plurality of holes 2 provided in the fin main body 1. be done. In this case, the U-pipe is formed by a U-pipe pender (not shown), and the U-pipe after forming is inserted by an automatic insertion machine (not shown).
It is beginning to be manufactured in

However, due to the mechanism of the U-pipe pender, the shape of the tip 4 of the conventional U-pipe 3 causes a burr 5 that widens at the tip as shown in FIG. It was difficult to insert the U-pipe 3 smoothly.

In a heat exchanger, the clearance between the inserted U-pipe and the hole 2 of the fin body 1 is set strictly, so it used to take some getting used to inserting it by hand, but it can be done automatically. If it is inserted, it becomes a major cause of insertion errors.

[Purpose of the invention]

The present invention was made in consideration of the above circumstances, and
To provide a U-pipe tip forming device which can easily insert the tip of the U-pipe into a hole of a fin body by processing the tip of the U-pipe.

[Summary of the invention]

The present invention relates to a U-pipe tip forming device that processes the tip of a U-pipe so that both tips of the U-pipe are inserted into holes formed in a fin body of a heat exchanger. The pipe is provided with a pin that supports the pipe when the diameter is reduced, and a forming block that is provided on the outer periphery of the pin by a spring and that fits with the outer periphery of the pipe at the tip of the U-pipe to reduce the diameter of the outer periphery of the tip. This is characterized by the fact that before inserting the U-pipe into the hole in the fin body, a pin is inserted into the tube at the tip of the U-pipe and a forming block is fitted to form the tip into a tapered shape. The diameter of the fin is reduced so that it can be easily inserted into the hole in the fin body.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a U-pipe tip forming device according to the present invention will be described below with reference to the accompanying drawings.

Figure 3 shows the main parts of the U-pipe tip forming device according to the present invention, in which two U-pipes 3
An example of a forming mechanism 6 that processes the tip portions 4 of the two at the same time is shown. In the figure, 7 is a cylindrical forming block, and its inner peripheral surface 8 is the U pipe 3.
It is formed in a shape that widens toward the end so that its outer periphery is reduced in diameter when it is fitted with the distal end portion 4 of. A pin 10 having a conical protrusion 9 at the tip is provided within the forming block 7. The diameter of this pin 10 is formed to be slightly smaller than the inner diameter of the tip 4 of the U pipe 3.
The forming block 7 supports the inside of the tube when the diameter of the tip 4 is reduced, and prevents the tube diameter of the tip 4 from becoming too small.

The forming block 7 and the pin 10 are supported by a support stand 11, and the forming block 7 is urged toward the U-pipe 3 by a spring 12.

This forming mechanism 6 is provided during the process of forming the U pipe 3 with a U pipe pender (not shown) and inserting it into the hole 2 of the fin body 1 with an automatic insertion device (not shown). The tip 4 of the U-pipe 3 is secured by the mixing block 7 and the pin 10.
is processed into a tapered shape as shown in FIG.
That is, the forming mechanism 6 is moved to the U-pipe 3 side, the forming block 7 is fitted to the outer periphery of the tip 4, the pin 10 is inserted into the inner periphery, and the inside of the tip 4 is supported by the pin 10. At the same time, the end portion 4 is
Reduce the diameter of the outer circumference.

Next, the entire forming device provided with this forming mechanism 6 will be explained with reference to FIG.

The U-pipes 3 formed by a U-pipe bender (not shown) are suspended from the transfer cable 14 of the take-out transfer device 13 with their bent portions 3a straddling them, and are transferred in a continuous state. This transfer cable 1
Above the transfer direction of the U pipe 3 of 4, there is a U pipe 3.
A stopper device 15 for stopping the movement of the U-pipe 3 and an escape device 16 for separating the two leading ends of the U-pipe 3 stopped by the stopper device 15 are supported by a support 17. The stopper device 15 consists of a cylinder 18 mounted on a support 17 and a stopper piece 19 that moves up and down with the cylinder 18 to stop or release the U-pipe 3 suspended by the transfer cable 14. . The escape device 16 consists of a cylinder 20 mounted on a support 17 and an escapement lever 21 that is rotated by the cylinder 20 (the rotation mechanism is omitted).As shown in FIG. The reciprocating movement of the escapement levers 22 causes the pair of escapement levers 21 to rotate in a direction in which they clamp the transfer cable 14, and vice versa, in a direction in which they separate from the transfer cable 14, respectively. Also, the escapement lever 21 is the seventh
As shown in the figure, each U-pipe 3 is connected to a rod 22 at a pitch corresponding to its diameter, and the reciprocating movement of the rod 22 causes each escapement lever 21 to rotate simultaneously, separating the two U-pipes 3 at the top. do.

A fixing device 23 for supporting the bent portion 3a of the U-pipe 3 is provided on the support body 17 in front of the stopper device 15 and the escape device 16 in the transport direction. This fixing device 23 includes a cylinder 24 and its cylinder 2
3, and a fixing part 25 that is moved up and down by the U-pipe 3 and is fitted into the bent part 3a of the U-pipe 3 to fix the bent part 3a.

A transfer device 26 is provided below the fixing device 23 for transferring the two U-pipes 3 separated by the escape device 16 as described above to a position where their bent portions 3a are fixed by the fixing device 23. This transfer device 26 includes a claw 27 that grasps the two U-pipes 3 after separating the two U-pipes 3 with the escape device 16, a cylinder 28 that moves the claws 27, and a cylinder 28 that guides the movement of the claws 27. It consists of a guide member 29. A holder 30 that supports the lower part of the U-pipe 3 is provided below the transfer device 26 . At the position where the two U-pipes 3 are supported by the fixing device 23 and the holder 30, the forming mechanism 6 that reduces the diameter of the tip 4 of each U-pipe 3 moves up and down along the axis of the pipe 3. It is attached to the lifting rod 32 of the molding cylinder 31.

In the above, a U pipe pender (not shown)
U pipe 3 that is bent and formed into a U shape
The bending portion 3 is attached to the transfer cable 14 of the extraction transfer device 13.
A is straddled and suspended by the transfer rope 14 and transferred in series. The movement of this U pipe 3 is stopped by a stopper device 15, and the fifth
As shown in the figure, the U-pipes 3 are arranged closely together. In this case, the transfer cable 14 is moving and the U pipe 3 is stopped in a state where it has slipped relative to the transfer cable 14. By tilting the transfer cable 14 slightly upward, the slip can be performed smoothly. 3 do not overlap each other. After the U-pipe 3 is stopped by the stopper device 15, the escape device 16 is activated, and the escapement lever 21 rotates to sandwich the transfer cable 14, thereby separating the two leading U-pipes 3. In this state, the claw 27 of the transfer device 26
extends to the escape device 16, and the escape device 16 grabs the two separated leading U-pipes 3. If this claw 27 grabs the U pipe, the escapement lever 2 of the escape device 16
1 are rotated to open each other, and at the same time, the stopper device 15 is released, and the U-pipe 3 is moved by the claw 27 to a predetermined position below the fixing device 23.
When the claw 27 grabs the U-pipe 3 and moves, the stopper 15 rotates again to stop the following U-pipe 3, and the escape device 16 rotates to separate the first two.

U pipe 3 transferred to a predetermined position by claw 27
is supported at the top and bottom by the fixing device 23 and the holder 30, and in this state, the forming mechanism 6 is moved by the forming cylinder 31 toward the tip 4 of the U-pipe 3, and as described above, the forming mechanism 6 moves the tip 4 to the fourth Reduce the diameter to the shape shown in the figure. In this case, the forming block 7 of the forming mechanism 6 is supported by the support base 11 via the spring 12, so that it can form uniformly by absorbing the difference in length at the tips 4 of the two U-pipes 3, that is, at four locations. This is so that the force during machining is uniformly applied to the entire U-pipe 3, and no excessive load is applied locally. The U-pipe 3 after the diameter reduction process is released from the fixing device 23, the holder 30, and the forming mechanism 6, and is transferred to an automatic insertion device (not shown) via the transfer cable 14.

〔Effect of the invention〕

As is clear from what has been described in detail above, the present invention exhibits the following excellent effects.

(1) Since the diameter is reduced using a forming block that fits with the outer circumference of the tip of the U-pipe and reduces the diameter of the outer circumference of the tip, the U-pipe can be easily inserted into the hole of the fin body. Ru.

(2) Since a pin is provided in the forming block to support the inner periphery of the tube when the diameter is reduced, the diameter of the tip portion is not reduced excessively and the diameter can be maintained at a substantially constant degree of reduction at all times.

(3) Since the diameter of the tip of the U-pipe is reduced so that it can fit easily into the fin, there will be no mistakes in insertion even if it is inserted automatically.

(4) After the U-pipe is inserted, the heat exchanger is transported by gripping the hole at the tip of the U-pipe, but by reducing the diameter of the hole in the U-pipe to a substantially constant diameter, mistakes in transport can be eliminated.

(5) A forming block is installed around the outer circumference of the pin using a spring, which absorbs differences in the length of the U-pipe and enables uniform forming, making it possible to process multiple tips at the same time. .

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the state in which the heat exchanger is manufactured, Fig. 2 is a partial sectional view showing the tip shape of the conventional U-pipe inserted into the hole in the fin body in Fig. 1, and Fig. 3 is the main body. FIG. 4 is a partial cross-sectional view showing the shape of the tip of the U-pipe processed by the device shown in FIG. 3, and FIG. 6 is a front view showing the entire U-pipe tip forming device according to
The drawings are a view taken along the - line in FIG. 5, and FIG. 7 is a side view of FIG. 6. In the figure, 1 is the fin body, 2 is the hole, 3 is the U pipe, 4 is the tip, 7 is the forming block, 1
0 is a pin.

Claims (1)

[Claims] 1 In a U-pipe tip forming device that processes the tip of a U-pipe in order to insert both tips of the U-pipe into holes formed in the fin body of a heat exchanger, the U-pipe is inserted into the tube of the tip and when the diameter is reduced. and a forming block that is supported by a spring on the outer periphery of the pin and that fits with the outer periphery of the pipe at the tip of the U-pipe to reduce the diameter of the outer periphery of the tip. U characterized by
Pipe tip forming device.