JPS6339552Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a safety device for welding, and is particularly suitable for use as a safety device on the side of combustion gas such as acetylene gas. This is intended to prevent the backflow of acetylene gas when it flows back to the side of the acetylene gas during combustion, and to separate them from each other to prevent an explosion of the combustion gas supply source.

Furthermore, a spring involved in the connection/separation of the socket-side joint and the plug-side joint is incorporated into the joint to facilitate connection/separation operations and fusing operations.

Embodiments of the present invention will be specifically described below.

The welding safety device of the present invention 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 body 3, in which a movable valve seat 4, a movable valve body 5, and a flashback prevention member 6 are assembled.

The movable valve seat 4 has a cylindrical portion 7 and a flange-shaped seat portion 8 erected on the inner periphery of one end thereof, and the cylindrical portion 7 is in airtight contact with the inner peripheral surface of the socket body 3 via a packing 9. is movable in both directions relative to the socket body. The shoulder portion 11 of the stop ring 10 screwed onto the right end of the socket body 3 engages with the right end of the cylindrical portion 7 of the valve seat 4 to prevent the valve seat from coming out from the socket of the socket body. However, the elastic force of the compression spring 12 acts to move the valve seat 4 in the direction of the stop ring 10. Therefore, when both the joints 1 and 2 are in the separated state, the valve seat 4 is pressed to the forward position where it engages with the stop ring 10.

In the valve body 5, large diameter portions 13 and 14 are joined back to back by a small diameter portion 15, and a cylindrical portion 16 that expands stepwise extends from the right portion 14.
A part of the valve seat 4 slidably contacts the inner circumferential surface of the valve seat 4,
The flow path of the socket body is divided into two, and fluid flowing in the normal direction (arrow A) flows from the outside to the inside through the through hole 17 of the cylindrical portion of the valve body and flows out. Each large diameter portion 1 of the valve body 5
Rubber packings 18 and 19 are fixed to the outer peripheries of valve seats 3 and 14, and the seat portion 8 of the valve seat 4 extends between these packings.

When the valve body 5 is moved to the forward position by fluid pressure in the normal direction, the packing 18 comes into airtight contact with the seat 8 to block the flow in the normal direction (rightward direction), and when the fluid flows backward, The backflow pressure causes the valve body 5 to retreat to the left, bringing the packing 19 into airtight contact with the seat 8 to prevent backflow.

The flashback prevention member 6 is formed into a cylindrical shape by laminating a plurality of wire mesh plates, and the stacking method is to layer one with a coarse mesh one on top of the other with one with a dense mesh one on top of the other, or stack one layer with a thin layer on the inside and one layer with a thin layer on the outside. It has the property of allowing gas to pass through, but not flame, by stacking them close together toward the surface. In addition to the wire mesh method, it is also possible to use a method with the same effect, such as sintered metal, which is made by baking and hardening metal powder. This flashback prevention member 6
is incorporated into the socket body 3 in front of the valve seat 4, one end of which is connected to the intermediate shoulder 22 of the socket body 3 through a packing 21, and the other end is connected to the joint portion through a packing 23 and a guide plate 24. 25 flanges 26, respectively. The joint portion 25 is screwed onto the end of the socket body 3. A flow path with an annular gap is formed between the outer peripheral surface of the flashback prevention member 6 and the inner peripheral surface of the socket body 3, and gas flowing in the normal direction passes through the peripheral wall of the flashback prevention member 6 from the outer periphery to the inside. pass around. When a backflow occurs, the valve body 5 retreats to the left to close the flow path and prevent the backflow, but even if a backfire occurs and the flame flows back past the valve body 5, the flashback prevention member Blocked by 6.

The guide plate 24 guides the gas flowing into the socket body 3 to the outer periphery of the flashback prevention member 6, and for this purpose, a cross-shaped groove 27 is formed on the outer surface of the guide plate 24. The gas is guided in the radial direction along the grooves 27 and reaches the outer peripheral surface of the flashback prevention member 6.

The plug-side joint 2 includes a cylindrical plug body 28 that forms a flow path communicating with the flow path of the socket-side joint 1, and its tip portion is inserted into the tip of the socket body 3 through a packing 29 in an airtight manner. It will be done.

As a means for connecting the socket side joint 1 and the plug side joint 2 to each other, the socket side joint 1 has a connecting ball 31 inserted into a plurality of circular holes 30 of the socket body 3, and a valve seat so as to engage with the connecting balls. 4, and a movable sleeve 33 that is loosely fitted around the outer periphery of the socket body 3 in a reciprocating manner to prevent the connecting ball 31 from escaping out of the socket body 3. The movable sleeve 33 is always urged forward by a compression spring 34 to the right in the drawing, and has an inner circumferential surface 35 that contacts the connecting ball 31 in the forward position, and a diameter larger than the inner circumferential surface. However, an inner circumferential surface 36 forming an annular space between it and the outer circumferential surface of the socket body 3, and both circumferential surfaces 35, 3
6 and has a shoulder 37 formed therebetween.

The plug-side joint 2 is provided with a movable sleeve 38 that is reciprocatably loosely fitted around the outer periphery of the plug body 28, and the sleeve is always urged by a compression spring 39 to move forward in the left direction in the drawing, so that the sleeve 38 is not connected to the other sleeve 33. It has an opening edge 40 that is inserted relatively into the annular space between it and the socket body 3, and an annular connection groove 41 that is formed to engage with the connection ball 31. An inner cylinder 42 is screwed onto the rear end of the movable sleeve 38.
A cylinder 43 is assembled between the plug body 28 and the plug body 28, and the cylinder 43 is urged rearward by a spring 39.

When both the joints 1 and 2 are separated as shown in FIG. 1, the valve seat 4 and the movable sleeve 33 of the socket side joint 1 are moved forward by the springs 12 and 34, and the valve body 5 is moved forward by the fluid pressure. pressed into position,
The packing 18 of the valve body 5 airtightly contacts the seat 8 of the valve seat to block the flow path, and the outer peripheral surface of the valve seat 4 pushes out the connecting ball 31 in the radial direction so that it does not protrude into the socket body 3. The inner peripheral surface of the movable sleeve 33 presses the connecting ball 31 to prevent it from escaping. In the plug-side joint 2, a movable sleeve 38 is pressed to the forward position by a spring 39.

When the plug body 28 is inserted into the socket body 3 and pushed in, the valve seat 4 and the valve body 5 are pushed together by the plug body 28, as shown in FIG.
8 separates from the seat portion 8 of the valve seat 4 to open the valve, and the annular groove 32 of the valve seat 4 reaches the position of the connecting ball 31.

At the same time, the movable sleeve 38 moves forward while retracting the movable sleeve 33 by the elastic force of the spring 39, and pushes the connecting ball 31 into the annular groove 32 of the valve seat 4 from the position indicated by the dotted line to the position indicated by the solid line. The annular connecting groove 41 reaches the position of the connecting ball 31 (FIG. 3).

Then, as the pushing force of the plug body 28 is released, the plug body 28 retreats toward the right in the drawing with respect to the movable sleeve 38 and the socket body 3 due to the elastic force of the spring 39, as shown in FIG. The valve seat 4 is moved forward in the same direction by the elastic force of the spring 12, and the valve body 5 is moved forward by the fluid pressure. The advancing valve seat 4 pushes up the connecting ball 31 in the radial direction with its outer peripheral surface and engages with the connecting groove 41 of the movable sleeve 38, thereby connecting the joints 1 and 2 to each other (FIG. 4).

To separate the plug body 28 from the connected state shown in FIG. 4, insert the sleeves 33, 38 as shown in FIG.
Connect the annular groove 32 of the valve seat 4 by pushing it against the connecting ball 3.
1, the socket body 3 will fit into the sleeve 33.
2, the connecting ball 31 is moved from the solid line position to the dotted line position by the valve seat 5.
The connecting groove 41 of the movable sleeve 38 is removed from the connecting ball 31, and both joints 1,
2 are separated from each other (FIG. 1). This separation is easily accomplished by one operation in which the plug body 28 and the movable sleeve 33 are pressed against each other.

When both joints 1 and 2 are connected, fluid flows into the socket body 3 as shown by arrow A, and the fluid flows through the guide plate 24.
It is guided from there to the outer periphery of the flashback prevention member 6, flows from the outer periphery to the inner periphery, passes through the through hole 17 of the valve body 5, and reaches the plug body 28.

When a backflow occurs, the backflow pressure pushes the valve body 5 and causes it to retreat. The valve body 5 is its packing 19
contacts the seat portion 8 of the valve seat 4 to prevent backflow, and at the same time, the valve seat 4 is moved back to align the annular groove 32 of the valve seat with the connecting ball 31 (FIG. 5). At the same time spring 34
The elastic force pushes out the movable sleeve 38 via the movable sleeve 33. As a result, the movable sleeve 38 pushes the connecting ball 31 into the annular groove 32 of the valve seat 4 and moves over the connecting ball to separate the plug body 28 from the socket body 3. This separation occurs rapidly due to backflow pressure as well. The valve body 5 is also advanced by fluid pressure in the normal direction to block flow in the normal direction.

If a flashback occurs during backflow and the flame flows in the direction of the gas supply source beyond the valve body 5, the flashback prevention member 6 prevents the flame from passing and there is no risk of explosion.

In this way, in the welding safety device of the present invention, the valve body 5 is pressed against the valve seat 4 by backflow pressure to prevent backflow, and the valve seat 4 is retreated by the valve body 5 to connect the connecting means of both joints. Since it is configured to separate both joints 1 and 2 by releasing it, if this safety device is installed between the combustion torch and the combustible gas supply source, oxygen gas will flow from the combustion torch side toward the combustible gas supply source. To prevent the backflow of gas or a mixed gas of oxygen gas and acetylene gas with or without combustion, and to completely isolate it from the combustible gas supply source to eliminate the danger of explosion from the source. It can function perfectly as a safety device.

Furthermore, the present invention provides compression springs 34 and 3 that are involved in connection and separation between the socket side joint 1 and the plug side joint 2.
9 communicates with the annular space between the socket body 3 and the movable sleeve 33 loosely fitted on the outer periphery of the socket body 3, and the annular space between the plug body 28 and the movable sleeve 38 loosely fitted on the outer periphery of the socket body 3. Plug body 2
8 and its outer periphery and the cylinder 43 loosely fitted into the movable sleeve 38, and are configured so as not to be exposed to the outside of each joint 1, 2, so that both joints can be When performing connection/separation operations or welding operations, the hands do not come into contact with the spring, allowing these operations and operations to be performed smoothly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially longitudinal front view showing the separated state, FIGS. 2 and 3 are partially longitudinal front views showing the manual connection or separation process, and FIG. 4 is a partially longitudinal front view showing the manual connection or separation process. FIG. 5 is a partially longitudinal front view showing the connection state, and FIG. 5 is a partially longitudinal front view showing the separation process due to reverse flow. In the figure, 1 is the socket side joint, 2 is the plug side joint,
3 is a socket body, 4 is a movable valve seat, 5 is a movable valve body, 6 is a flashback prevention member, 8 is a seat portion, 10 is a ring stopper,
12 is a compression spring, 17 is a through hole, 18 and 19 are rubber packings, 24 is a guide plate, 27 is a flange, 2
8 is a plug body, 31 is a connecting ball, 32 is an annular groove,
33 is a movable sleeve, 34 is a compression spring, 38 is a movable sleeve, 39 is a compression spring, and 41 is a connecting groove.

Claims (1)

[Scope of utility model registration request] A socket side joint 1 having a flow path, a plug side joint 2 having a flow path communicating with the flow path of the socket side joint, and a means for connecting both joints in a separable manner, It comprises a socket main body 3 that forms a passage, a movable valve seat 4 and a movable valve body 5 that are incorporated into the flow passage and selectively shut off the flow of gas in the normal direction and the reverse direction, and the plug side joint is as described above. The connecting means includes a plug body 28 forming a flow path, a connecting ball 31 inserted into a hole 30 of the socket body, and a movable sleeve 33 loosely fitted around the outer periphery of the socket body to prevent the connecting ball from jumping out. a movable sleeve that is loosely fitted around the outer periphery of the plug body, is insertable into the annular space between the socket body and the movable sleeve, and has a connecting groove 41 that engages with the connecting ball;
The movable sleeve 33 is moved by a compression spring 34 built into the annular space between the sleeve and the socket body to a position where it prevents the connecting ball from popping out in the separated state, and the movable sleeve 38 is moved between the sleeve and the plug body. A compression spring 39 is built into the annular space between the annular space and the outer periphery of the plug body, and a cylinder 43 that is loosely fitted into the movable sleeve 38 and the plug body engages the connection groove with the connection ball during connection. When the socket body and plug body are in the connected state, the spring always applies an elastic force in the direction of separating them from each other, and the movable valve seat is retracted by the backflow pressure by the movable valve body, and the retraction A safety device for welding that automatically separates both joints.