JPS6333034Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an insertion type valve joint used for gas welding, etc., and is particularly characterized by preventing backfire.

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

The insertion type valve joint is composed of a socket side joint 1 and a plug side joint 2, and gas flows from the socket side joint to the plug side joint.

As shown in FIG. 1, the socket side joint 1 includes a cylindrical socket part 3, a cylindrical part 5 screwed into one end of the socket part to form a valve chamber 4, and a hose joint part 6 connected to the cylindrical part. A socket main body 7, a valve means incorporated in the valve chamber 4, and a cylindrical detachable sleeve 8 loosely fitted around the outer periphery of the socket portion 3.
, and an intermediate member 9 installed in an annular space between the socket portion 3 and the removable sleeve 8.

As the valve means, a cylindrical valve seat 10 and a cylindrical rubber packing 11 are fixed in the valve chamber 4 by being held between the intermediate stage of the socket part 3 and the stage and end face of the cylindrical part 5. Furthermore, the valve body 1 in contact with the valve seat 10
2 is assembled in the valve chamber 4 so as to move forward and backward, and the valve body 12 is pressed against the valve seat 10 by a coiled compression spring 13 inside the valve chamber. Valve body 12 is valve seat 1
When it is pressed to 0, the flow path is closed,
When the valve seat 10 is away from the valve seat 10, the flow path is opened, and the gas flowing into the flow path from the end face of the hose joint 6 flows in from the outside through the circulation hole 14 in the peripheral wall of the valve body 12. It flows out from the end face of the socket part 3.

The valve body 12 is opened and closed by a plug portion 15, which will be described later. When the plug portion 15 is inserted into the socket portion 3, the end face of the plug portion 15 pushes the valve body 12 to open a flow path, and the plug portion 15 is inserted into the socket portion. 3, the valve body 12 is pressed against the valve seat 10 by the spring 13 and closes the flow path. Note that 16 is a member that is fixed to the valve body 12 with a ring-shaped rubber packing and comes into contact with the valve seat.

The socket portion 3 has three holes 17 bored at equal intervals around its peripheral wall, and a connecting ball 1 is inserted into each hole.
8 is inserted into the hole 17. The hole 17 is formed in a conical shape that narrows toward the center of the socket portion 3, and the diameter of the connecting ball 18 is formed to be larger than the minimum diameter of the hole 17 but smaller than the maximum diameter, preventing the connecting ball 18 from jumping out of the hole 17 to the inside. The connecting ball 18 engages with an annular connecting groove 19 of the plug portion 3 to connect the socket portion 3 and the plug portion 15 to each other.

The detachable sleeve 8 is loosely fitted around the outer periphery of the socket portion 3 so as to be rotatable and movable from the forward position to the backward position or vice versa. The removable sleeve 8 has a flanged retaining ring 20 screwed onto its outer peripheral end, and a non-slip knurl 2 on the outer periphery of the retaining ring.
1 and has an annular raised portion 22 on the inner peripheral surface. When the detachable sleeve 8 is in the forward position, the protrusion 22 moves away from the position where the connecting ball 18 is pushed in, allowing the connecting ball to move in the radial direction, and in this state, the plug part 15 and the socket part 3 can be connected and removed will be held. The raised portion 22 further extends to the connecting ball 1 when the detachable sleeve 8 is in the retracted position.
The plug part 15 and the socket part 3 are connected to each other by pushing the connecting ball in line with the position 8 and engaging a part of the connecting ball in the connecting groove 19.

Intermediate 9 has outer flange 23 and inner flange 2
4, and by engaging the inner flange 24 with the retaining ring 25 of the socket part 3, the intermediate member 9 is connected to the socket part 3 so as to be able to move forward and backward and rotate,
By extending the outer flange 23 between the flange 26 of the retaining ring 20 and the raised portion 22, the detachable sleeve 8 is connected to the socket portion 3 so as to be movable forward, backward, and rotatable. A coiled compression spring 27 is provided between the inner flange 24 and the step 28 of the socket part to move the intermediate member 9 to the forward position, and a coiled compression spring 29 is provided between the outer flange 23 and the raised part 22 of the removable sleeve. The removable sleeve 8 is provided between the intermediate member 9 and the removable sleeve 8 .

As shown in FIG. 2, the plug side joint 2 includes a cylindrical plug portion 15, a cylindrical portion 31 that is integrally connected to the rear end of the plug portion and forms a part of the valve chamber 30, and A plug body 34 is comprised of a cylindrical portion 32 that is screwed into the end of the valve chamber 30 to form a part of the valve chamber 30, and a cylindrical joint portion 33 for connecting a tool that is integrally connected to the cylindrical portion. Equipped with: The plug part 15 has an annular connecting groove 19 formed at its tip, and the cylindrical part 31
has a diameter larger than that of the plug part 15, a shoulder part 35 is formed at the connecting part between the two, the joint part 33 has a female thread 36 for connection on its inner peripheral surface, and the outer peripheral surface has a thread for applying a spanner. It is formed into a hexagonal shape, and a flange 37 is formed at a portion where the cylindrical portion 32 and the joint portion 33 are continuous. The plug-side joint 2 further includes a check valve means and a flashback prevention means built into its valve chamber 30.

The check valve means includes a valve seat 38 and a check valve body 39. The valve seat 38 includes a cylindrical portion 40, a valve seat portion 41 formed at its tip, and a flange 4 formed at its rear end.
2, and the valve seat 38 has a flange 4 in the valve chamber 30.
The outer peripheral surface of 2 contacts the inner peripheral surface of the cylindrical portion 32, the end surface contacts the flange 37, and the cylindrical portion 40 contacts the inner peripheral surface of the cylindrical portion 32.
An annular space is formed between the outer circumferential surface of the cylindrical portion 40 and the inner circumferential surfaces of the cylindrical portions 31 and 32.

The check valve body 39 has a cylindrical portion 4 having a relatively large diameter.
3, a cylindrical portion 44 integrally connected to the cylindrical portion and having a smaller diameter, and a portion integrally connected to the cylindrical portion and having an even smaller diameter closing one end of the cylindrical portion 44. 45 and rubber packing 46
is fixed to the portion 45. This check valve body 39 is arranged in a cylindrical portion 40 of the valve seat 38, with the outer periphery of the cylindrical portion 43 slidably contacting the inner periphery of the cylindrical portion 40, and a portion 45
is incorporated so as to face toward the plug portion 15. When the check valve body 39 moves in the direction of the plug part 15, the packing 46 contacts the valve seat part 41 and closes the flow path, and when it moves in the opposite direction, the packing 46 contacts the valve seat part 41 and closes the flow path.
is separated from the valve seat portion 41 to open a flow path. Check valve body 3
9 is open, gas flows through a plurality of communication holes 47 (4 in the embodiment) bored at equal intervals in the cylinder part 44.
) flows from the outside to the inside. Note that if a coiled compression spring 48 having a resilient force weaker than the fluid pressure in the normal direction is provided between the check valve body 39 and the flange 37, the check valve body 39 will be unloaded when a backflow occurs. It operates more sharply than without it.

The flashback prevention means is composed of a flashback prevention member 49 which is formed into a cylindrical shape by laminating a plurality of wire mesh plates. It has the property of allowing gas to pass through but not flame. In addition to the wire mesh method, it is also possible to use sintered metal made from sintered metal powder, which has the same properties.
The cylindrical flashback prevention member 49 is inserted into an annular space surrounded by the outer circumferential surface of the cylindrical portion 40 and the inner circumferential surfaces of the cylindrical portions 31 and 32, and one end thereof is connected to the flange 42 through the packing 50. The ends are respectively engaged and held by the shoulders 35 of the cylindrical portion 31 via the packing 51 and the disk 52. The outer circumferential surface and inner circumferential surface of the flashback prevention member 49 are the same as the inner circumferential surfaces of the cylindrical portions 31 and 32 and the cylindrical portion 4.
A flow path having an annular gap is formed between the outer circumferential surface of each of the holes. Then, the gas flowing in the normal direction passes through the peripheral wall of the flashback prevention member 49 from the outside to the inside, opens the check valve body 39, and flows through the flow hole 47 from the outside to the inside in the direction of the arrow. When a backflow occurs, the check valve body 39 operates to close the flow path and prevent the backflow, but even if a backfire occurs and the flame flows back, the flashback prevention member 49 will prevent it.

The disc 52 guides the gas flowing out from the plug part 15 to the outer periphery of the flashback prevention member 49, and for this purpose, a cross-shaped groove 53 is formed on one side of the disc (on the plug part side). Gas from the plug portion 15 flows radially along the groove 53 and reaches the outside of the flashback prevention member 49.

The connection and separation of the socket-side joint 1 and the plug-side joint 2, the opening and closing of the valve means and check valve means, and the flashback prevention function will be comprehensively described.

When the socket side joint 1 and the plug side joint 2 are separated as shown in Figs. 1 and 2,
The valve body 12 is pressed against the valve seat 10 to close the flow path, the removable sleeve 8 and intermediate member 9 are in the forward position to release the restraint of the connecting ball 18, and the check valve body 39 is pressed against the valve seat 38. The flow path is closed.

When the plug part 15 is inserted into the socket part 3 and pushed together with the intermediate member 9 against the springs 27 and 29, the connecting groove 19 reaches the connecting ball 18, and at the same time, the detachable sleeve 8 is moved back by the spring 29 and the connecting ball is moved. 1
8 is pushed into the connecting groove 19 and restrained, and both joints 1 and 2 are connected to each other as shown in FIG. 3. The valve body 12 is pushed in by the plug part 15 to open the valve, and the gas flowing into the joint part 6 flows through the valve body 12.
It reaches the plug part 15 through the flow hole 14, passes through the flashback prevention member 49, opens the check valve body 39, and flows out from the joint part 33. When a backflow occurs, the check valve body 39 is closed to prevent the backflow, and if the flame should flow back past the check valve body 39, it will be blocked by the flashback prevention member 49 (FIG. 4).

When separating, as shown in FIG. 3, when the detachable sleeve 8 is moved forward, the restraint of the connecting ball 18 is released, and at the same time, the plug part and the socket part move relatively back to release the connection between the two joints, and the connection between each joint is released. The valve is closed.

The insertion type valve joint of the present invention includes a socket side joint 1 in which valve means 10 and 12 are incorporated, a check valve means 38,
39, a plug-side joint 2 incorporating a flashback prevention means 49, and a means 8 for connecting these joints to each other;
17, 18, and 19, the flashback prevention means 4
Reference numeral 9 denotes a flashback prevention member formed in a cylindrical shape using wire mesh or the like that allows gas to pass through but prevents flame from passing through, and is incorporated in the valve chamber 30, and the flashback prevention member has the above-mentioned backfire prevention member inside the flashback prevention member. The provision of the valve means 38, 39 improves safety against flashbacks, and is convenient to use since it is the same size as a conventional plug-in valve joint without flashback prevention means.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially vertical front view of the socket-side joint, FIG. 2 is a partially vertical front view of the plug-side joint, and FIG. FIG. 4 is a partially longitudinally sectional front view showing a state in which the flow is flowing in a normal direction, and FIG. In the figure, 1 is the socket side joint, 2 is the plug side joint, 3 is the socket part, 4 is the valve chamber, 7 is the socket body, 8 is the removable sleeve, 9 is the intermediate element, 10 is the valve seat, 12 is the valve body, 13 is the Compression spring, 15 is a plug part, 18 is a connecting ball, 19 is a connecting groove, 27 and 29 are compression springs, 30 is a valve chamber, 34 is a plug body, 38
is a valve seat, 39 is a check valve body, 49 is a compression spring, 49
52 is a disk, and 53 is a groove.

Claims (1)

[Scope of utility model registration request] An insertion type valve joint comprising: a socket side joint having a valve means incorporated therein; a plug side joint having a check valve means and a flashback prevention means incorporated therein; and means for connecting these joints to each other, wherein the flashback prevention means is a flashback prevention member formed into a cylindrical shape from a wire mesh or the like having the property of allowing gas to pass but preventing flame from passing through, and which is incorporated into the valve chamber, and the check valve means is provided inside the flashback prevention member.