JPS582544Y2 - Connection end fitting for soldering with metal pipe end - Google Patents

Description

[Detailed description of the invention] The present invention is generally installed in many ways as a supply path for oil and air in automobiles or various machines, equipment, devices, etc.
Especially the wall thickness is about 2. Q rn/m or less, pipe diameter approximately 30 m/
The present invention relates to an improvement in the structure of a connecting end fitting that is used by solder welding to the end of a thin metal tube having a thin wall and a small diameter of less than m.

As shown in FIG. 3, a secondary connection end fitting according to the prior art is a solder welded 15 to the end of a thin-walled, narrow-diameter metal tube 11.
Since the retaining wall portion 14 of the connecting end fitting 12 was configured as shown in 11 without any processing, the shaft center communication hole located in the retaining wall portion made of a relatively thick wall was If welding occurs around the hole, there will be an extreme difference in wall thickness between the thin-walled metal tube 11 side, making it difficult to judge the appropriate degree of heating, and the tube side near the heating area will become brittle due to overheating. Vibration during use or forced installation when the bent shape of the product is defective often leads to cracks and breakage in the fragile parts.

Furthermore, there is a problem in that not only is the work forced to stagnate because time is wasted in the heating work, but also heating energy is lost.

The purpose of the present invention is to provide a connecting end fitting for solder welding with the end of a metal pipe, which effectively solves the problems of the prior art described above with an extremely simple structure. To describe the embodiment in detail, a thin-walled small-diameter metal tube 1 has a threaded portion 3 at the front portion on the outer circumferential side at its end, and an engagement support wall portion 4 at the rear portion of the threaded portion. It has a communication hole 5 in the shaft core.
The connecting end fitting 2 is solder-welded 8 to the connecting end fitting 2 near the hole circumferential portion 5' located in the supporting wall portion 4.

An annular groove 7 is formed on the back surface of the supporting wall 4 in an annular shape and concentric with the hole circumference 5', and this groove 7 preferably has a wall thickness approximately equal to the wall thickness on the metal tube 1 side. It is provided with a thin cylindrical wall 6 held.

As described above, according to the present invention, the annular groove part 7 is provided in a state in which the thin cylindrical wall 6 is held annularly and concentrically with the hole circumferential part 5' on the back surface of the retaining wall part 4. The cylindrical wall 6 of the welding part has a thin wall, making it easy to determine the appropriate degree of heating when performing solder welding work by hand-heating with a burner, etc., and there is no need to take into account the weakening that occurs on the pipe side near the heating part due to overheating. Therefore, it is possible to effectively reduce and prevent cracks and breakage from this fragile part caused by vibration during use or forced installation when the product has a defective bending shape, and furthermore, the heating time can be reduced. By shortening the length, it was possible to improve the efficiency of heating work and save heating energy.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a connection end fitting for solder welding with a metal pipe end according to one embodiment of the present invention, Fig. 2 is a view corresponding to Fig. 1 according to another embodiment, and Fig. 3 The figure is a partially cutaway side view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Metal tube, 2... Connecting end fitting, 4... Locking wall part, 5'... Hole circumferential part, 6... Thin cylindrical wall, 7... Annular groove part.

Claims (1)

[Scope of utility model registration request] The front part of the outer circumferential side has a threaded part and the rear part of the threaded part has a retaining wall part, and a metal part is attached near the stone wall part located in the said retaining wall part of the communicating hole of the shaft core part. In a connecting end fitting formed by solder welding to an end of a pipe, a thin cylindrical wall is held in an annular shape and concentrically with the circumference part, and an annular groove is provided on the back surface of the retaining wall part. Features: Connecting end fittings for use with metal pipe ends.