JPH0630634U - Welding and melting machine flashback preventer connection device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a flashback preventive device connecting device for a welding and fusing machine, which is very simple in cost and excellent in safety. [Structure] An annular groove 16 is provided on the outer periphery of the front end of the mounting port tubular portion 15 of the flashback suppressor 3, and a flange portion 19 provided inside the rear end of the tightening nut 18 is provided behind the annular groove 16 of the mounting port tubular portion 15. Then, the locking ring 17 is fitted in the annular groove 16 to lock the tightening nut 18, and the tightening nut 18 is screwed to the threaded portion of the connection port cylinder 2 of the pressure regulator 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flashback preventive device connecting device for a welding and fusing machine, in which a flashback suppressor is connected to a pressure regulator of a high-pressure gas container for welding and fusing.

[0002]

[Prior art]

 For welding and fusing machines, it is obligatory to attach a flashback suppressor to the hose connection port of the pressure regulator in order to prevent accidents due to the flashback suppressor.

Usually, as shown in FIG. 4 (a), a connecting device for a flashback preventer of this type is such that the hose connection port 2 of the pressure regulator 1 and the mounting port cylinder portion 4 of the flashback suppressor 3 face each other. Rotate the left and right screw nuts 5 by screwing the left and right screw nuts 5 with left and right screws engraved from both ends on the inner peripheral surface into the screw portion 2a of the connection port 2 and the screw portion 4a of the mounting port 4. While the hose connection port tube portion 2 and the attachment port tube portion 4 are connected to each other in a butted state, the two and 4 are separated by the rotation in the opposite direction.

However, in the flashback preventive device connecting device using the nuts 5 of the left and right screws, the nut 5 is rotated only slightly due to contact with another obstacle, and the hose connecting port 2 and the mounting port are attached. Since the tubular portion 4 and the tubular portion 4 are separated at the same time, there is a drawback that the risk of gas leakage is very high.

In order to solve such a drawback, as shown in FIG. 4B, an intermediate connecting member 6 having a collar portion 7 on the outer periphery of the front end and a screw portion 8 engraved on the outer periphery of the rear end is manufactured. Using a tightening nut 9 having an annular flange 10 protruding inward at the rear end, insert the intermediate connecting member 6 into the tightening nut 9 to lock the flange 7 to the flange 10. After assembling, screw the screw part 8 to the body of the flashback suppressor 3, and then tighten the tightening nut 9 to the screw part 2a of the connection port cylinder part 2 of the pressure regulator 1 to tighten it. A flashback suppressor connecting device for connecting the intermediate connecting member 6 to the connecting port tube portion 2 in a butt state is known.

[0006]

[Problems to be solved by the device]

 However, in the above-mentioned conventional flashback preventer connecting device, the use of the intermediate connecting member 6 having a complicated structure causes a large increase in cost. Further, the intermediate connecting member 6 must be screwed to the flashback preventer in a state where the intermediate connecting member 6 is assembled by inserting the tightening nut, and the assembling work is troublesome.

The present invention has been made in view of the above circumstances, and has a simple structure, easy assembling work, and a wide range of cost reduction. The purpose is to provide a device.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a tightening nut having an annular groove at the rear end and an inwardly projecting annular flange while providing an annular groove on the outer periphery of the front end of the mounting opening cylinder. After inserting the flange part to the rear side of the annular groove of the mounting port cylinder part, fit a locking ring in the annular groove to lock the flange part of the tightening nut, and then the tightening nut. Is screwed to the connecting port cylinder portion of the pressure regulator.

[0009]

[Action]

 With the above configuration, the locking ring can be fitted in a state in which the tightening nut is inserted into the mounting opening cylinder portion, and the assembling work becomes very easy only by screwing the tightening nut into the hose connection opening.

[0010]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a gas cylinder 11 equipped with a pressure regulator 1 and a flashback preventor 3 which are connected using the flashback preventer connecting device of the present invention. The pressure of the gas in the gas cylinder 11 is adjusted by the pressure adjuster 1, and is led to the gas burner (not shown) at the tip of the gas hose through the flashback preventer 3 and the hose 12. Reference numeral 13 is a pressure gauge of the pressure regulator 1.

The flashback preventer 3 has a structure in which a reverse check valve is provided inside to prevent the backflow of the fire of the gas burner. As shown in FIGS. Is projected. The mounting port cylinder portion 15 has a gas flow passage in the center and an annular groove 16 is provided on the outer periphery of the tip portion. The flashback preventer 3 may be provided with an annular groove 16 in place of the screw portion 4a in the existing one having the mounting port cylinder portion 4 illustrated in FIG. 4A.

A locking ring 17 formed by bending a metal wire is fitted into the annular groove 16. The locking ring 17 is fitted in the annular groove 16 after a tightening nut 18 to be described later is inserted into the mounting opening cylindrical portion 15.

The tightening nut 18 that connects the pressure regulator 1 and the flashback suppressor 3 has a flange portion 19 projecting inward at the rear end, and the inner hole of the flange portion 19 is used for mounting the flashback suppressor 3. It is adapted to be closely fitted to the mouth tube portion 15. Then, as shown in FIG. 3, after the tightening nut 18 in which the flange portion 19 is located on the rear side by the annular groove 16 of the mounting opening tubular portion 15 is inserted into the mounting opening tubular portion 15, The locking ring 17 is fitted in the annular groove 16, and the tightening nut 18 is locked by the locking ring 17. In this state, the tightening nut 18 is screwed onto the threaded portion 2a of the connection port tube portion 2 of the pressure regulator 1, and by this screwing, the connection port tube portion 2 of the pressure regulator 1 and the flashback preventer are secured. 3 is attached in a butted state.

[0015]

[Effect of device]

 As described above, the connecting device of the present invention has a small number of parts, has a simple structure, and is extremely easy to assemble a tightening nut with the tubular portion of the flashback suppressor. A wide cost reduction can be achieved. In addition, by simply screwing a tightening nut onto the connecting port cylinder of the pressure regulator, it is possible to achieve high safety without gas leakage.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a usage state of a flashback preventive device connecting device according to the present invention.

FIG. 2 is a partial cross-sectional view showing the connecting device.

FIG. 3 is a partial cross-sectional front view showing an exploded state of the connecting device.

FIG. 4 is a sectional view showing a main part of a conventional flashback preventive device connecting device.

[Explanation of symbols]

 1 Pressure Regulator 2 Connection Port Cylinder 3 Flashback Preventer 15 Mounting Port Cylinder 16 Annular Groove 17 Locking Ring 18 Tightening Nut 19 Flange

Claims (1)

[Scope of utility model registration request] 1. An annular groove is provided on the outer periphery of the tip of a mounting port cylinder portion of a flashback preventer, and an annular flange portion projecting inward is provided at a rear end of a tightening nut, and the flange portion of the tightening nut is mounted on the mounting portion. After being fitted to the rear side of the annular groove of the mouth cylinder,
Reverse of a welding and fusing machine, characterized in that a locking ring is fitted in the annular groove to lock the tightening nut, and the tightening nut is screwed to the threaded portion of the connection port cylinder of the pressure regulator. Fire arrestor connection device.