JPH0324956Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pipe joint that is controlled during abnormal fluid pressure.

[Conventional technology]

Conventionally, pipe fittings for transmitting fluid generally consist of a socket and a plug, and the socket and the plug each have a built-in valve that is biased toward the distal end, that is, in the connection direction, by a compression spring to close the fluid passage. When the socket and plug are connected, the valves built into each contact each other and push against each other against the elastic force of the compression spring, retracting the valves and opening a fluid passage, so that the socket and plug communicate with each other. It's summery.

When such a pipe joint is used to send fluid, it is not equipped with a valve mechanism that stops fluid delivery in the event of abnormal pressure, so fluid continues to be delivered even if the fluid pressure on the fluid receiving side becomes higher than necessary. In this way, if you continue to send fluid even if the fluid pressure on the fluid receiving side becomes higher than necessary, there is a risk of damaging equipment or instruments at the end of the fluid receiving side, so do not In some cases, a regulator was attached for protection.

[The problem that the idea attempts to solve]

As mentioned above, conventional pipe fittings do not have a mechanism to stop the fluid flow when the fluid pressure on the fluid receiving side becomes higher than necessary, so they are provided with a regulator or other protective equipment. If measures are not taken, there is even concern that an accident may occur.

In view of the above points, this invention aims to solve the problem of stopping the feeding of fluid when the fluid pressure exceeds a set pressure.

[Means to solve the problem]

In order to solve the above problems, this invention consists of a socket and a plug that can be connected removably by operating a sleeve, and when the two are connected, the tips of the valves built into each other come into contact and push each other, opening the valves and connecting. A pipe joint that connects the fluid passages of a socket and a plug, the main cylinder of the socket having a distal end protruding in a centripetal direction over the entire circumference, and a valve seat having the same radius at each part, The entire circumference of the end face of the part is a large-area fluid pressure receiving surface, the fluid pressure receiving surface has a protruding part that maintains a state in contact with the fluid when the socket and plug are connected, and the slide has a small area of fluid pressure receiving surface around the rear end face. The movable inner cylindrical body is biased to a predetermined position by a compression spring, and is slidably and airtightly fitted in the axial direction, and the inner cylindrical body is biased by a compression spring when not connected to the plug. A valve is provided in which, when the large area portion of the inner cylinder body moves forward and receives a fluid pressure equal to or higher than a set pressure, the valve head contacts the valve seat as the inner cylinder body retreats to close the fluid passage. This system adopts a similar configuration.

[Effect]

When a socket and a plug are connected, the tips of the valves built into each other come into contact and push each other, the valve of the plug moves back to open a fluid passage, and the valve of the socket also moves back to open a fluid passage from the valve seat formed in the inner cylinder. They separate to open a fluid passage and communicate with each other.
At this time, the large pressure receiving surface of the inner cylinder is separated from the plug by a few thousand feet and receives fluid pressure. Therefore, when fluid is sent from the plug side to the socket side, the fluid flows to the socket side through the fluid passage opened by the retracted valve.

At this time, the large fluid pressure receiving surface of the inner cylinder fitted into the main cylinder constituting the socket receives the fluid pressure.

Since the fluid pressure receiving surface has a larger area than the fluid pressure receiving surface provided on the rear end side of the inner cylinder, the inner cylinder is always pressed backward by the fluid pressure of the fluid flowing from the plug side to the socket side. As long as the elastic force of the compression spring that urges the inner cylinder toward the distal end is superior to the pressing force of this fluid, the inner cylinder is located at the distal end of the main cylinder and the fluid passage is open. , the fluid continues to flow from the plug side to the socket side. Under such normal conditions, when the fluid pressure from the plug side that is received by the large area fluid pressure receiving surface of the inner cylinder becomes larger than the elastic force of the compression spring,
Since the inner cylinder moves backward against the elastic force of the compression spring due to the fluid pressure, the valve seat formed on the inner surface of the annular protrusion of the inner cylinder moves against the valve head of the valve in the open state. As a result, the fluid passage within the socket is cut off, and the fluid that has been continuously being sent from the plug side to the socket side is cut off.

After that, the pressure acting on the large-area fluid pressure-receiving surface gradually decreases, and the inner cylinder body advances toward the connected plug again due to the elastic force of the compression spring, causing the valve head of the valve to move inwards. It separates from the valve seat of the cylinder and returns to the previous state of flow.

〔Example〕

This invention will be described in detail below based on embodiments shown in the drawings.

In the drawing, 1 is a socket, 2 is a socket main cylinder, and 3 is an inner cylinder fitted in the main cylinder 2 in an axially slidable and airtight manner. An annular protrusion 6 is formed on the entire inner peripheral surface, with the inner surface serving as a valve seat 4 and the outer surface having a relatively large area of a tip-side fluid pressure receiving surface 5 that receives fluid pressure from the plug side.
Further, a rear end fluid pressure receiving surface 7 having a smaller area than the distal end fluid pressure receiving surface 5 is formed on the rear end side.

The inner circumferential surface of the socket main cylinder 2 is designed such that the tip of the inner cylinder 3 comes into contact with the inner peripheral surface when the socket 1 is connected to a plug 27, which will be described later, and the front end of the inner cylinder 3 does not come into contact with the tip of the plug 27. A stepped portion 8 is formed to restrict movement. In addition, the socket main cylinder body 2 and the inner cylinder body 3
A compression spring 9 is elastically mounted between the inner cylindrical body 3 and the inner cylindrical body 3 toward the distal end. 10 and 11 are O-rings for sealing between the socket main cylinder 2 and the inner cylinder 3, and 12 is a ventilation hole formed in the socket main cylinder 2.

13 is a valve provided in the inner cylinder 3 so as to be freely movable in the axial direction, and this valve 13 is connected to the compression spring 1.
4, the valve head 15 at the front end contacts the valve seat 4, and when the socket 1 and the plug 27 are not connected, the fluid passage 16 is closed.
is starting to close. One end of the compression spring 14 is engaged with a stopper 17 provided within the inner cylindrical body 3. This stopper 17 is prevented from moving toward the rear end side by a cylindrical spacer 18, while the valve 13 is
The distance that the inner cylinder body 3 retreats against the elastic force is regulated to be equal to or less than the distance that the inner cylinder body 3 retreats. When received, the valve head 15 of the valve 13 and the valve seat 6 come into contact with each other as the inner cylinder body 3 retreats.

19 is a fluid hole formed in the stopper 17;
Reference numeral 20 indicates a hole formed in the spade 18.

21 is a tapered hole formed at the tip of the main cylinder 2;
22 is a lock ball loosely fitted into the tapered hole 21; 23 slides in the axial direction on the outer periphery of the main cylinder 2, presses the lock ball when the socket 1 and the plug 27 are connected, and releases the lock ball when the two are not connected. 24 is a lock ball holding part formed on the inner surface of the sleeve 23, 25 is a lock ball release part, 26 is a compression spring that biases the sleeve 23 in the lock ball holding direction, and 35 is a stop ring that prevents the sleeve 23 from coming off. be.

The plug 27 connected to the socket 1 has a built-in valve 29 which, when connected to the socket 1, comes into contact with the valve 13 built in the socket 1, pushes against each other, and retreats to open the fluid passage 28.

Reference numeral 30 denotes a compression spring that biases the valve 29 toward the tip side. When the socket 1 and the plug 27 are not connected, the compression spring 30 pushes the valve 29 forward, and the valve head provided at the tip of the valve 29 moves forward. 31 is a valve seat 32 formed on the inner peripheral surface of the plug 27
The fluid passage 28 is closed by contacting the fluid passage 28.

33 is a stopper for regulating the distance that the valve 29 retreats against the elastic force of the compression spring 30;
34 is a lock ball engaging groove formed on the entire outer periphery of the plug 27.

Next, the operation of the above embodiment will be explained.

When connecting the socket 1 and the plug 27, the sleeve 23 is moved to the left in FIG. Lock ball 22 by operating sleeve 23
When the socket 1 and the plug 27 are connected, the distal ends of the valve 13 and the valve 29 built into each other come into contact and press each other, and the valve 29 of the plug 27 presses against the compression spring 3.
While retreating against the elastic force of 0 and opening the fluid passage 28, the inner cylindrical body tip surface 5 of the socket 1 and the plug 27
The tip surfaces of the two approaches each other. On the other hand, socket 1
The valve 13 also retreats against the elastic force of the compression spring 14 and separates from the valve seat 4 formed in the inner cylindrical body 3 to open a fluid passage 16 and communicate with each other. (Figure 2).

Therefore, when fluid is sent from the plug 27 side to the socket 1 side, the fluid flows through the retracted valves 29 and 1.
The fluid flows from the plug 27 side to the socket 1 side through the fluid passages 28 and 16 opened by 3.

At this time, both the fluid pressure receiving surfaces 5, 7 on the front end side and the rear end side of the inner cylinder body 3 fitted into the socket main cylinder body 2 receive fluid pressure.

Since the front end side fluid pressure receiving surface 5 has a larger area than the rear end side fluid pressure receiving surface 7, the fluid pressure receiving surface 5 receives a large fluid pressure, and is affected by the fluid pressure of the fluid flowing from the plug 27 side to the socket 1 side. As a result, the inner cylinder 3 is always pressed rearward. As long as the elastic force of the compression spring 9 that biases the inner cylinder 3 toward the distal end is greater than the pressing force of this fluid, the inner cylinder 3 will be located at the distal end of the socket main cylinder 2, that is, its distal end will be The fluid passage 16 is held open by the stepped portion 8, and the fluid continues to flow from the plug 27 side to the socket 1 side.

Then, assuming that the fluid pressure from the plug 27 side which is received by the distal end side fluid pressure receiving surface 5 of the inner cylinder body 3 rises above the set pressure and becomes larger than the elastic force of the compression spring 9, at this time, The cylindrical body 3 retreats against the elastic force of the compression spring 9 due to fluid pressure, and the valve seat 4 formed by the inner surface of the annular protrusion 6 protruding from the inner peripheral surface on the distal end side of the inner cylindrical body 3 Since it comes into contact with the retracted valve 13, the fluid passage 16 in the socket 1 is blocked, and the sending of fluid from the plug 27 side to the socket 1 side is stopped.

As described above, when the fluid pressure from the plug 27 side becomes greater than the elastic force of the compression spring 9, the inner cylinder 3 is moved back to block the fluid passage 16. The fluid pressure for retracting the inner cylindrical body 3 is approximately proportional to the pressure of the elastic force of the compression spring 9. Therefore, the fluid pressure that causes the inner cylindrical body 3 to retreat and the fluid passage 16 is shut off by the elastic force of the compression spring 9 can be set arbitrarily, and the set fluid pressure can be changed by replacing the compression spring 9 as appropriate. I can do it.

In addition, in the above embodiment, an example of a socket was explained as a pipe joint that sends fluid from the plug side to the socket side, but it is also possible to send fluid from the socket side to the plug side, and it is also possible to It is also possible to implement this configuration in a plug.

[Effect of idea]

According to this invention, when the fluid pressure exceeds the set pressure, it is possible to shut off the fluid passage in the socket and stop the fluid feed, thereby protecting equipment and instruments at the end of the socket from the fluid pressure. can do. It is especially suitable as a pipe joint for sending fluid to equipment or instruments that do not have a regulator, and the pressure value can be set freely by changing the spring constant of the compression spring. Furthermore, since the structure is simple, it is easy to manufacture and can be obtained at low cost.

[Brief explanation of drawings]

Fig. 1 is a partially longitudinal side view showing an embodiment of this invention, Fig. 2 is a partially longitudinal side view showing the state in which the socket and plug shown in Fig. 1 are connected, and Fig. 3 is a partially longitudinal side view showing the state in which the socket and plug shown in Fig. 1 are connected. FIG. 4 is a partially longitudinal side view showing a state in which the fluid passage on the socket side is blocked when a large fluid pressure is applied from the plug side to the pipe joint in the connected state shown in FIG. 1...Socket, 2...Socket main cylinder, 3...
... Inner cylinder body, 4 ... Valve seat, 5 ... Front end side fluid pressure receiving surface, 6 ... Annular protrusion, 7 ... Rear end side fluid pressure receiving surface, 8 ... Step part, 9 ... Compression spring, 13 …
... Valve, 14 ... Compression spring, 15 ... Valve head, 16 ... Fluid passage, 27 ... Plug, 28
...Fluid passage, 29...Valve.

Claims (1)

[Scope of utility model registration request] It consists of a socket and a plug that are removably connected by operating a sleeve, and when the two are connected, the tips of the valves built into each other come into contact and push each other, opening the valves and communicating the fluid passages of the connected socket and plug. This pipe fitting has a tip part that protrudes in the centripetal direction over the entire circumference within the main cylinder of the socket, a valve seat with the same radius at each part, and a large-area fluid pressure receiver on the entire circumference of the end surface of the part. The sliding inner cylindrical body has a protrusion that maintains the fluid pressure receiving surface in contact with the fluid when the socket and plug are connected, and the sliding inner cylinder has a small area of fluid pressure receiving surface around the entire rear end surface, and is moved to a predetermined position by a compression spring. When the inner cylinder is not connected to the plug, it moves forward under pressure from a compression spring and receives fluid pressure higher than the set pressure. A pipe joint provided with a valve whose valve head comes into contact with the valve seat as the inner cylinder moves backward when the large-area portion of the cylinder receives the valve, thereby closing the fluid passage.