JPH0160325B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a petal-shaped finned tube suitable for use in, for example, a heat exchanger.

The present applicant previously filed a patent application (hereinafter referred to as the "prior invention") for a method and apparatus for manufacturing a petal-shaped finned tube as shown in FIGS.
(See Publication No. 30420). This is a molding device consisting of a die rotating body 2 having a plurality of pins 16 implanted on the side end surface, and a press die rotating body 1 having at least two press dies 8a, 8b on its outer periphery. The tape-like fin material S disposed around the pin 16 and wound around the pin 16 is formed into a wave shape by the pushing operation of the press molds 8a and 8b, and then the forming device and the core tube P are intermittent rotated and the forming device After wrapping the forming material around the core tube P by relative intermittent movement in the core tube axis direction,
It is designed to be heated and soldered.

However, there are problems that need to be solved when the prior invention is put into practical use. A device 17 for applying a brazing material such as solder for soldering is installed at the front stage of the input side of the molding device. For this reason, it is necessary to apply solder or other brazing material to the outer periphery of the core tube P before the core tube P is inserted into the hollow shaft 6, which is not only extremely inefficient, but also requires application of solder or other brazing material. When inserting the core tube P into the hollow shaft 6, the outer periphery of the core tube P hits the corner A (Fig. 2) of the transmission wheel 7 attached to the input side of the hollow shaft 6, and the applied solder or other brazing material falls off. There is an inconvenience.

This invention was made to solve these problems, and will be described below with reference to embodiments shown in the drawings.

Now, the present invention provides a brazing method in place of the application by the brazing material application device 17 provided at the front stage of the entry side of the molding device in the technique of the above-mentioned prior invention. An apparatus for manufacturing a petal-shaped finned tube to which the brazing method of the present invention is applied will be described below. In addition,
1 and 2 are for explaining the previous invention, but since the parts excluding the brazing material coating device 17 are part of the apparatus for carrying out the present invention, FIGS. The explanation will be given with reference again to , and also with reference to FIGS. 3 to 5.

In Figs. 1 and 2, 1 is a push-type rotating body, 2
3 is a mold rotating body, 3 is a housing that rotatably supports these rotary bodies 1 and 2, the pushing die rotating body 1 is supported by a bearing 4 on the housing 3, and the die rotating body 2 is inside the pushing die rotating body 1. A bearing 5 is fitted onto one end of a rotatably supported hollow shaft 6. Then, it rotates integrally with the hollow shaft 6 by a driving force transmitted through a transmission wheel 7 fitted to the other end of the hollow shaft 6.

8a and 8b are press molds, and support plates 10a,
It is attached to the tips of cylinders 9a and 9b supported via 10b. 11 is a push-type guide groove;
12 is a tension spring, 13 is a stand, and 14 is a positioning stopper for the push-type rotating body 1.

The side end surface of the mold rotating body 2 is provided with guide grooves 15 cut at equal pitches around the entire circumference, and a plurality of pins 16 implanted in an annular shape near the center between the guide grooves 15, 15. There is. Further, the pressing molds 8a, 8b are formed with pressing mold guide pieces 8a', 8b' which are guided by the pressing mold guide grooves 11, 15. Furthermore, the molding device is provided with a heating device H that heats the molding material wound around the core tube P.

The molding device configured in this manner is the same as the previous invention, but as described above, the present invention uses a wax tape such as solder instead of the solder wax coating device 17 provided on the entry side of the hollow shaft 6. Either overlap the tape-shaped fin material S, which is the fin material, or put it in a clad state and place the brazing material on the tape-shaped fin material S.
It was designed to be supplied in a timely manner.

FIG. 3 shows an embodiment in which a brazing material tape T such as solder is superimposed on a tape-shaped fin material S and supplied to the core pipe P. In this case, the reel 18 is installed on the outlet side of the hollow shaft 6 so as to have an inclination angle corresponding to the core tube winding angle of the molded material with respect to the axial direction of the core tube P. A reel 19 for a tape coil of solder or other brazing material is provided, and the solder or other brazing material tape T to be unwound is superimposed on the back side of the tape-like fin material S, wound around the pin 16, and pressed into the press molds 8a, 8b.
The core tube P is wound spirally at a predetermined wrapping angle by the pushing operation toward the center of the core tube P, the intermittent rotation of the forming device and the core tube P, and the relative intermittent movement in the core tube axis direction. and then soldered using a heating device H at a later stage.

In this method, as shown in FIG. 4, a tape-like fin material S unwound from a reel 18 may be clad with a brazing material T' such as solder on the back surface thereof.

Since the present invention has the structure and function as described above, when manufacturing petal-shaped finned tubes, it is possible to automatically supply brazing materials such as solder from the start of forming and winding, thereby improving work efficiency. It is extremely effective for improvement.

[Brief explanation of drawings]

FIG. 1 is a front view of a finned tube manufacturing apparatus according to the previous invention. FIG. 2 is a partially cutaway side view taken along the - line in FIG. 1. FIG. 3 is a front view of the main part of the present invention. FIG. 4 similarly shows another embodiment, and FIG. 5 is a detailed sectional view of section V in FIG. 4. In the figure: 1... Push type rotating body, 2... Type rotating body, 3... Housing, 6... Hollow shaft, 7... Transmission wheel,
8a, 8b...Press die, 9a, 9b...Cylinder, 1
4... Positioning stopper, 16... Pin, 17... Brazing material applicator, 18, 19... Reel, P... Core tube, S
...tape-like fin material, T...brazing tape for solder, etc., T'...brazing material for solder, etc.

Claims (1)

[Claims] 1. A molding device consisting of a mold rotor having a plurality of pins implanted in a ring shape on the side end surface and a press rotor having at least two press molds on its outer periphery is disposed around the core tube, The tape-shaped fin material wound around the pin is formed by pushing the pressing die into the center of the core tube, and then the forming device and the core tube are intermittently rotated and the forming device is intermittently moved relative to the axis of the core tube. In the case where the molded material is wrapped around the core tube by heating and then soldered, a brazing material tape such as solder is placed on the side where the tape-like fin material to be wrapped around the pin is joined to the core tube. A method for producing a petal-shaped finned tube, characterized in that the brazing material is supplied together with a tape-shaped fin material by stacking them together or in a clad-like structure.