JPH0747155Y2 - Tube expansion device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a pipe expansion of a heat exchanger, and more particularly to a pipe expansion device for fixing a large number of heat radiation fins and a plurality of pipes by the pipe expansion.

[0002]

2. Description of the Related Art Conventionally, as a tube expanding apparatus of this type, as shown in FIG. 4, for example, a plurality of tube expanding mandrels 1 are provided on a back surface 9a of a reciprocating body 9 which can be raised and lowered by a cylinder 8 or the like.
0 ... is inserted, and moreover, a plurality of radiating fins 1 are provided below.
1. A pipe 1 to be expanded whose lower end is formed in a substantially U shape
2. A heat exchanger 14 having desired end plates 13a and 13b is set at both ends of the heat radiating fins 11 ...
After that, the mandrel 10 due to the lowering of the reciprocating body 9 ...
There are those in which the tubes 12 are expanded and fixed to the end plates 13a and 13b and the plurality of heat radiation fins 11 by press-fitting and are appropriately used.

In the tube expanding device 15, a substantially U-shaped tube portion 12a protruding from the end plate 13b on the lower side of the heat exchanger 14 is provided with a receiver base 16 provided in the tube expanding device 15. By being supported by a plurality of receivers 17 that are detachably attached to the ... and integrally provided, the end plate 13b and the substantially U-shaped tube portion 12a of the projecting tube 12 are protected when the tube is expanded. It is something you can do.

[0004]

However, the tube expanding device having the conventional receiver has the following problems.

That is, the above-mentioned conventional heat exchanger is not limited to one having a plurality of heat dissipating fins, each of which has a lower end formed in a substantially U-shape and which penetrates the pipe to be expanded in the same direction in two rows. Depending on the order from the delivery destination etc., the end plate has a step along the protruding front and rear pipes, and the protruding length of the substantially U-shaped pipe portion protruding from the lower end is not constant but varies. There are some differences depending on the application.

Therefore, when expanding the heat exchanger 14 or the like having a configuration in which the protruding lengths of the substantially U-shaped tube portions 12a protruding from the lower end portion of the end plate are not constant as described above, they are varied. As shown in FIG. 5, the protruding tube portion 12
a must be replaced with a receiver 17a corresponding to the protruding length of a, or an unnecessary receiver 17b must be removed, and when the heat exchanger 14 having a step on the end plate 13b is expanded. 6, it is necessary to attach the spacer 18 between the receiver 17 and the receiver base 16 as shown in FIG. 6, so that a time loss occurs in the detaching work and the like, and thus the operating time of the tube expanding device is significantly hindered. There have been various difficult problems such as a decrease in productivity and work efficiency.

Therefore, the present invention solves all of the above problems, and in the case where the end plate of the heat exchanger has a step along the two rows of pipes projecting from the end plate. Even in such cases, it is not necessary to attach or detach the receiver that supports the two rows of front and rear tubes protruding from the end plate, and moreover, the tubes in the front and rear rows are supported simultaneously and surely for proper pipe expansion. It is an object of the present invention to provide a pipe expanding device that is extremely excellent in workability and that has extremely high production efficiency.

[0008]

That is, according to the present invention, a mandrel for expanding a pipe is press-fitted from one end side of a pipe penetrating a large number of heat radiation fins constituting a heat exchanger, and the pipe is connected to the other end side. In a tube expansion device provided with a receiver to support,
A tube 12 through which the receiver 1 penetrates the radiation fin 11.
It is provided so as to be movable in the penetrating direction.

[0009]

In the pipe expanding apparatus having the above-mentioned structure, the receiver supporting the other end of the pipe penetrated by the plurality of heat radiating fins constituting the heat exchanger is provided movably in the penetrating direction of the pipe. Therefore, regardless of the end plate provided at the other end side of the heat exchanger having a step or the protruding length of the pipe protruding from the end plate, the receiver is moved to move the receiver regardless of the protruding length of the pipe. The part 12a can be reliably supported.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 designates two rows, a front row and a rear row, which project from an end plate 13b provided at the other end of a heat exchanger (not shown) set in the tube expanding device (not shown). The receiver which supports the tube part 12a of substantially U shape is shown.

Reference numerals 2a and 2b denote receiver stands on which the above-mentioned receivers 1 are arranged in series. The receiver stands 2a and 2b are hydraulic cylinders 3a and 3b on a bed plate 6 provided on the tube expanding device (not shown). Through the receiver
-1 in the direction intersecting the longitudinal direction of the pipe 12 supported by
It is arranged side by side.

In the upper part of the receiver 1 supporting the above-mentioned U-shaped tube portion 12a, there is formed a hole having a flat oval shape and a semicircular cross section so that the tube portion 12a can be inserted and removed. And a projection 1a for allowing the receiver 1 to be inserted into and removed from the bottom of the receiver 1 in a hole 2c provided in the upper surfaces of the receiver bases 2a and 2b. Are formed.

Reference numerals 4a and 4b are the receiver bases 2a and 2b.
When the cylinders 3a and 3b move upward from the upper surface of the bed plate 6, the receiver base 2
a, 2b and a spacer inserted between the bed plate 6 and a pair of front and rear corresponding to the receiver bases 2a, 2b through the spacer hydraulic cylinders 5a, 5b provided on the bed plate 6. It will be done.

The tube expanding apparatus according to this embodiment has the above-mentioned structure. A case will be described in which the tube expanding of a heat exchanger having a step on the end plate is performed using the apparatus described below.

First, as shown in FIGS. 1 and 2, for example, when the hydraulic cylinder 3a side is extended (arrow A) according to the step of the end plate 13, the cylinder 3a is extended.
The receiver 2a attached to will move upward.

Next, the spacer hydraulic cylinder 5a is extended (arrow B) so that the spacer 4a attached to the spacer hydraulic cylinder 5a is inserted between the bottom of the receiver base 2a and the bed plate 6. As a result, it is possible to prevent the receiver base 2a from being lowered when expanding the pipe, and to reliably support the pipe portion 12a protruding from the end plate having the step.

Further, at the time of expanding the tube, the tube portion 12a protruding from the end plate 13b provided in the heat exchanger 14
When the protruding lengths of the two are different, the receiver stands 2a, 2
Each of the tube portions 12a having different protruding lengths can be supported by instantly removing or replacing a predetermined receiver 1 from b.

Further, as shown in FIG. 3, receiver stands 2a, 2
By combining the moving means for moving b above the bed plate 6 with the servo motor 3c and the telescopic device 7 for moving the receiver bases 2a and 2b up and down by the operation of the servo motor 3c, the receiver The movement stroke (arrow C) of the tables 2a and 2b can be finely adjusted, so that the NC can be used for various heat exchangers.
Can be turned into.

In the above-mentioned embodiment, a plurality of receivers for supporting the pipe portion projecting from the end plate are connected to a plurality of receiver stands provided in front and rear rows of the pipe expanding device, and are moved. However, the present invention is not limited to this. For example, each receiver itself may be a mechanism that moves up and down or expands and contracts. Needless to say, the arrangement pattern is not limited to two rows in the front and rear, and the arrangement pattern is not limited to a straight line, and may be various patterns such as a non-linear line and a staggered pattern.

Further, in the above-mentioned embodiment, the moving means for moving up and down the receiver base is composed of a hydraulic cylinder, but the point is that an apparatus composed of an air cylinder, a servomotor or the like may be used as long as it moves up and down the receiver base. Often,
The specific means is by no means limited.

The receiver, the means for moving the receiver base, and the specific shape, quantity, mechanism, etc. of the tube expanding device in the present invention are not limited by any means. If the receiver supporting the tube portion projecting from the other end of the vessel is provided so as to be movable in the penetrating direction of the tube penetrating the heat exchanger, the specific configuration is all within the scope intended by the present invention. The design can be changed freely.

[0023]

As described above, according to the present invention, the mandrel for expanding the pipe is press-fitted from one end side of the pipe penetrated by the plurality of heat radiation fins constituting the heat exchanger, and the pipe is connected to the other end side. In a tube expanding device provided with a receiver for supporting, since the receiver is provided so as to be movable in the penetrating direction of the tube penetrating the heat radiation fin, the end plate of the heat exchanger is Even when there is a step along the two rows of front and rear tubes protruding from the plate, it is not necessary to attach or detach the receiver that supports the two rows of front and rear tubes protruding from the end plate. Since it is possible to support two tubes in the front and rear rows at the same time and surely to perform an appropriate expansion, not only the conventional complicated work of attaching and detaching the predetermined receiver becomes unnecessary but also the work time and the like. With the loss eliminated Always excellent workability, moreover is possible to provide a very high expanding apparatus of production efficiency led to have a particular effect that can.

[Brief description of drawings]

FIG. 1 is a perspective view showing a receiver of a tube expanding device according to the present invention.

FIG. 2 is a side view showing a state in which the receiver of the tube expanding device of the present invention is expanded.

FIG. 3 is a perspective view showing a state during pipe expansion using another moving means in the pipe expansion device of the present invention.

FIG. 4 is a front view of a tube expanding device having a conventional receiver.

FIG. 5 is a perspective view showing a detached state of a receiver in a conventional tube expanding device.

FIG. 6 is a cross-sectional view showing a state of a receiver in a conventional tube expanding device during tube expansion.

[Explanation of symbols]

 1 receiver 2a receiver stand 2b receiver stand 3a hydraulic cylinder (moving means) 3b hydraulic cylinder (moving means) 6 bed plate

Claims (6)

[Scope of utility model registration request] 1. A pipe expanding mandrel is press-fitted from one end of a pipe penetrating a large number of heat radiation fins constituting a heat exchanger,
Moreover, in the tube expanding device in which the receiver for supporting the tube is provided on the other end side, the receiver 1 ... Is provided so as to be movable in the penetrating direction of the tube 12 penetrating the heat radiation fin 11. Tube expansion device characterized by: 2. The receivers 1 ... Are integrally provided on receiver bases 2a, 2b ... Which are movable in the penetrating direction of the pipes 12 by moving means provided in the tube expanding device unit 15. The tube expanding device according to claim 1. 3. The pipe expanding apparatus according to claim 1, wherein the moving means is cylinders 3a, 3b .... 4. The tube expanding device according to claim 1, wherein the moving means is a servo motor 3c. 5. The receivers 1 ... Connected to the receiver bases 2a, 2b are detachably mounted on the receiver bases 2a, 2b.
5. The tube expanding device according to any one of 4 to 4. Wherein said receiver base 2a, 2b ... may Receiver 1 ... in which is provided the record <br/> Sieber stand 2a, the 2b ...
The tube expanding device according to any one of claims 1 to 5, wherein a plurality of the tubes 12 are arranged side by side in a direction intersecting the longitudinal direction of the supported tube 12 .