JP3071902U - No welding union flex - Google Patents

Abstract

(57) [Summary] The present invention provides a non-welded union flex that prevents torsion, can use a commercially available union nut, and does not cause misalignment when the union nut is mounted. I do. In a non-welded union flex, a union screw is joined to an end of a union flange attached to an end of a flexible tube via a packing, and a union nut is screwed to an outer peripheral portion of the joint. A center guide with an ascending gradient was formed on the outer periphery on the tip side of the.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a non-welded union flex which prevents torsion, can generally use a commercially available union nut, and does not cause misalignment when the union nut is attached.

[0002]

[Prior art]

 Generally, the problem in a non-welded union flexible in which a union screw is joined to the end of a union brim attached to the end of a flexible tube via a packing and a union nut is screwed around the outer periphery of the joint is generally used. Whether or not commercially available union screws and union nuts can be used depends on whether union screws and union nuts used for non-welded union flex of a specific company are manufactured separately by the company. Due to the large number of parts, it is relatively expensive to repair when leakage of liquid etc. occurs.

[0003]

[Issues to be solved by the invention]

Since the centering between the flexible tube and the union screw cannot be accurately performed in the on-site fastening work, commercially available union screws and union nuts cannot be used in many cases with this type of conventional unwelded union flex. In this case, the procurement cost and work cost tend to be relatively expensive, even if they are useless at the time of emergency repairs and even if they can be ordered from a specific company. In addition, in the above-mentioned unwelded union flex, the flexible tube is often twisted because the union screw and the union nut used in the union flex are not easily centered during fastening work. There was a problem. In the conventional unwelded union flex, union screws and union nuts generally available on the market cannot usually be used. That is, since the commercially available union screw has a large inside diameter of the packing surface, the packing surface of the unwelded union flexible lacks compatibility. To solve this problem, it is conceivable to increase the inner diameter of the tube, but if the inner diameter of the tube increases, the union nut cannot be inserted. Also, if the peak height of the tube is reduced, the bending of the tube becomes harder. Further, if the thickness of the tube is reduced, the strength is weakened, so that there are various problems such as the necessity of preventing the torsion stress from being applied. The purpose of the present invention is to solve the above-mentioned problems, to enable the use of commercially available union screws and union nuts for this main union joint, and to make it easy to work in the field. It relates to a weld-free union flex that can be performed.

[0004]

[Means for Solving the Problems]

 In order to facilitate centering, a union screw is connected to the end of the union brim attached to the end of the flexible tube via packing, and a union nut is attached to the outer periphery of the joint. In the non-weld union flex to be screwed, a center guide with an ascending gradient was formed on the outer periphery of the tip of the union brim. Further, by forming a flat center step at the upper end of the center guide, the flexible tube is prevented from being twisted when the union nut is attached, and a commercially available union fitting can be used, thereby reducing the cost for repair. It was possible to achieve.

[0005]

[Embodiment of the invention]

 Hereinafter, embodiments and examples of the present invention will be described with reference to the drawings. 1 and 2, the unwelded union flex of the present invention has the following configuration. That is, a union flange 4 is provided on the outer periphery of the distal end extending portion 2 and the bent portion 3 of the flexible tube 1, and the union flange 4 and the union screw 5 are joined via the packing 6. The packing 6 is fitted to a packing receiver 14 provided at the most distal end of the flexible tube 1. 15 is a blade.

A union nut 8 having a locking projection 7 is screwed around the outer periphery of the joint between the union flange 4, the packing 6, and the union screw 5. The outer periphery of the central portion of the union flange 4 is a concave flat portion 10 on which the caulking ring 9 is seated. The concave flat portion 10 has a center guide 11 with an ascending slope formed at the tip thereof and a center step 12 formed flat at the upper end of the center guide 11. Reference numeral 16 denotes a screw portion.

On the outer periphery of the front end of the union flange 4, a protruding piece 13 that engages with a locking projection 7 formed on the rear end of the union nut 8, and a concave shape on which the center step 12 and the caulking ring 9 are seated. It comprises a center guide 11 having an ascending gradient from the tip of the flat portion 10 to the center step 12.

[0008] Due to the above-described configuration, when the union nut 8 is mounted, the locking projection 7 behind the union nut is guided by the center guide 11 having the union brim 4 with the ascending slope. The union flange 5 is screwed onto the outer periphery of the union screw 5 while being centered well, and the locking projection 7 at the rear of the union nut 8 is engaged with the front projection 13 of the union flange 4 to thereby form the union flange 4. Thus, the fastening of the packing 6, the union screw 5 and the union nut 8 can be firmly achieved.

[0009]

[Effect of the invention]

 In the unwelded union flex according to claim 1, a union screw is joined to the end of the union brim attached to the end of the flexible tube via a packing, and a union nut is screwed to an outer peripheral portion of the joint. The union flex has a center guide with an ascending gradient formed on the outer periphery of the tip end of the union brim.When the union nut is attached, the union screw and the flexible tube rotate well without removing the center. Twist can be effectively prevented. With the unwelded union flex of this invention, a union nut that matches the diameter of the flexible tube can be used, so a commercially available union nut can be used, and a commercially available union screw can be used even when repair is required. There is an effect that can be done. In the unwelded union flex according to the second aspect, a flat center step is formed at the upper end portion of the center guide, so that there is an effect that deviation after fastening is reduced.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a use state.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a half sectional view showing a conventional example.

[Explanation of symbols]

 1. . Flexible tube 2. . Tip extension 3. . Bending part 4. . Union collar 5. . Union screw 6. . Packing 7. . 7. locking projection . Union nut 9. . Casking 10. 10. concave flat portion Center guide 12. Center step 13. Projection piece 14. Packing receiver 15. Blade 16. Screwed part

Claims (2)

[Utility model registration claims] 1. A non-welded union flex in which a union screw is joined via a packing to an end of a union flange attached to an end of a flexible tube, and a union nut is screwed onto an outer periphery of the joint. A non-welded union flex, characterized in that a center guide with a slope is formed on the outer periphery of the tip side of the brim. 2. The unwelded union flex according to claim 1, wherein a flat center step is formed at an upper end of the center guide.