JPH08270849A - Coupling - Google Patents

Abstract

PURPOSE: To decide the connecting condition of a coupling in which self-seal valves are provided to a socket and a spigot respectively easily, and to prevent the leakage of the oil and the like in the pipings when the coupling is connected and disconnected, as well as to prevent a poor connection of the coupling owing to a vibration. CONSTITUTION: A positioning ring 16 is provided at a specific position of the male screw 12 of a socket 1. And when a quick disconnect nut 13 is abutted to the positioning ring 16, self-seal valves 8 and 9 are opened perfectly. And a locking nut 17 is provided at the inner side of the positioning ring 16, and the quick disconnect nut 13 and the locking nut 17 are made in a double-nut structure. Furthermore, an O-ring 19 is provided to a specific position in the inner hollow of the socket 1. And when the self-seal valves 8 and 9 are abutted each other, and begin to open, a clearance of the connecting surfaces of the socket 1 and a spigot 2 is sealed by the O-ring 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling for connecting hydraulic pipes and the like, and in particular, a self-sealing valve is internally provided in both a socket and a spigot so that the self-sealing valve can be mutually connected at the time of connection. The present invention relates to a coupling that opens by pressing.

[0002]

2. Description of the Related Art As a coupling for connecting flexible hydraulic pipes and the like to each other by using a self-sealing valve, a quick joint (a quick disconnect coupling) or a screw-in type coupling that can be connected with one touch is used. ing. In both cases, a self-sealing valve is installed inside the socket and the spigot respectively.When separating, each self-sealing valve closes the outlet of the socket or spigot, and when connecting, each self-sealing valve presses against each other and opens. It is supposed to do.

Further, the quick coupling has a detachable ring attached to the outer circumference of the socket, and the detachable ring is slid along the axial direction of the socket so that the socket and the spigot can be detached with one touch. Has been done. On the other hand, in the screw-in type coupling, a male screw is engraved on the outer peripheral surface of the socket, and the base end of the removable nut is loosely fitted along the outer periphery of the spigot. The male screw and the removable nut are screwed together to connect the socket and the spigot.

The quick joint can be quickly attached and detached, but since the human power linearly acts on the contact surfaces of the self-sealing valves of both the socket and the spigot to open it, the internal pressure acts on the pipe. Occasionally, the self-sealing valve will not open unless human force exceeding its internal pressure is applied. Therefore, if the internal pressure is high, it is difficult to connect. On the other hand, in the case of a screw-in type coupling, torque is applied to the detachable nut, and the torque is converted into a linear force by the screw mechanism to open the self-sealing valve, so even if the internal pressure is high. Can be easily connected.

[0005]

When determining whether or not the coupling is completely connected, the quick coupling does not know until pressure is applied to the piping. Further, although the screw-in type coupling can be judged to some extent by the reaction force of the removable nut, it cannot be said to be a reliable judgment method because there are individual differences in human power.

Further, the screw-in type coupling may loosen the detachable nut due to vibration during operation, resulting in poor connection. Further, when these couplings are attempted to be connected, the self-sealing valve starts to open before they are completely connected, so that there is a structural defect that oil or the like in the pipe leaks out.

[0007] Therefore, there arises a technical problem that can be easily determined, the connection failure due to vibration can be prevented, and the leakage of oil or the like at the time of attachment / detachment can be prevented. The present invention aims to solve the problems.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, in which a self-sealing valve is provided in each of the socket and the spigot, and the socket and spigot are connected to each other. At this time, the respective self-sealing valves are couplings that are pressed against each other to open, and a male screw is engraved on the outer peripheral surface of the socket, and the base end portion of the detachable nut screwed to the male screw is attached to the spigot. In a coupling rotatably fitted along the outer periphery, a positioning ring is provided around a predetermined position of the male screw, and
By screwing the detachable nut onto the male screw, when the detachable nut abuts the positioning ring, the self-sealing valves are respectively in an open state, and further, the self-sealing valve is inserted through the positioning ring of the male screw. When a self-sealing valve is provided inside the coupling and the socket and the spigot, respectively, and the socket and the spigot are connected to each other, the self-sealing valves are mutually connected. In the coupling that is opened by pressing the packing, the packing is provided around the socket inner cavity or the outer periphery of the spigot at a predetermined position, and when the socket and the spigot are connected, the packing is pressed by the socket and the spigot. Later, a coupling is provided in which the socket self-sealing valve and the spigot self-sealing valve abut.

[0009]

According to the present invention, when the detachable nut is screwed until it comes into contact with the positioning ring, it is sure that the self-sealing valves of both the socket and the spigot are opened and completely connected. I can judge. Then, by tightening the lock nut in the direction of the attachment / detachment nut, the attachment / detachment nut and the lock nut will have a double nut structure via the positioning ring, preventing the attachment / detachment nut from loosening due to vibration during operation. can do.

According to the second aspect of the invention, the self-sealing valve of the socket and the self-sealing valve of the spigot are not yet formed until the end of the spigot or the socket reaches the packing surrounding position at the time of connection. Because they are not in contact,
Both valves are closed so that oil, etc. in the piping will not leak.
Then, when the spigot or socket end portion is further deeply connected beyond the packing peripheral position, both self-sealing valves come into contact and start opening. However, at this time, since the gap between the joint surfaces of the socket and the spigot is sealed by the packing, the oil or the like does not leak outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a sectional view of the coupling 3 in a state where the socket 1 and the spigot 2 are separated.
In the inner cavities of the socket 1 and the spigot 2, brackets 4 and 5 are respectively extended from the inner wall toward the center, and cylinders 6 and 7 are arranged at the central ends thereof. Self-sealing valves 8 and 9 are inserted into the cylinders 6 and 7, respectively, and the self-sealing valves 8 and 9 are biased by springs 10 and 11, respectively, so that the outlets on the coupling side of the socket 1 and the spigot 2 are connected. Have been closed respectively.

A male screw 12 is engraved on the outer peripheral surface of the socket 1 on the connecting side, while a detachable nut 13 screwed onto the male screw 12 is mounted on the outer peripheral surface of the spigot 2 on the connecting side. A convex portion 14 is provided around the base end portion (end portion on the pipe connection side) of the detachable nut 13 toward the center, and a concave portion 15 into which the convex portion 14 is loosely fitted is formed around the outer peripheral surface of the spigot 2. It is set up. The detachable nut 13 is rotatably formed along the outer circumference of the spigot 2 by engaging and sliding the convex portion 14 and the concave portion 15.

Thus, at a predetermined intermediate position of the male screw 12 of the socket 1, the engraving of the male screw 12 is interrupted and a positioning ring 16 is provided around the position. Also, the male screw 12
An anti-loosening nut 17 is screwed on the inside (pipe connection side) via the positioning ring 16. Further, a groove 18 is provided around a predetermined position of the inner cavity of the socket 1 in the vicinity of the connection side end, and an O-ring 19 is planted in the groove 18.

Then, when the socket 1 and the spigot 2 are connected by screwing the detachable nut 13 onto the male screw 12, as shown in FIG. 2, first, the connection side end of the spigot 2 is connected. When the portion reaches the O-ring 19, the O-ring 19 is pressed, and then the self-sealing valve 8 of the socket 1 and the self-sealing valve 9 of the spigot 2 come into contact with each other. Then, when the spigot 2 is further inserted into the inner cavity of the socket 1, the self-sealing valves 8 and 9 are pressed against each other to open. Therefore, when the gap between the joint surfaces of the socket 1 and the spigot 2 is not sealed by the O-ring 19, oil and the like in the pipe is blocked by the self-sealing valves 8 and 9, and the self-sealing valves 8 and 9 open. When oil or the like in the piping flows through the coupling 3, the gap between the joint surfaces of the socket 1 and the spigot 2 is sealed by the O-ring 19. Thus, leakage of oil or the like when the coupling 3 is attached or detached is prevented. The O-ring 19 may be provided on the outer peripheral surface of the spigot 2 in the vicinity of the end portion on the connecting side to obtain the same effect.

When the detachable nut 13 is further screwed, the detachable nut 13 comes into contact with the positioning ring 16 and cannot be tightened any more as shown in FIG. At this time, the self-sealing valves 8 and 9 are in a fully opened state. Thus, the operator can not only know whether the coupling 3 is completely connected by the reaction force of the attachment / detachment nut 13, but also by visually recognizing whether the attachment / detachment nut 13 is in contact with the positioning ring 16. It is possible to judge the connection state of the coupling 3. In addition, whether or not the detachable nut 13 is loose during operation as well as during detachment can be easily confirmed only by visually observing whether or not the detachable nut 13 is in contact with the positioning ring 16.

Then, after the detachable nut 13 is screwed until it comes into contact with the positioning ring 16, the loosening prevention nut 17 is tightened in the direction of the detachable movement nut 13 to be detached from the looseness prevention nut 17. The nut 13 is crimped. As a result, the two have a double nut structure, and the detachable nut 13 does not easily loosen, so that the coupling 3 can be vibrated.
Can be prevented from being poorly connected.

Since the coupling 3 is of a screw-in type, it can be easily connected even if internal pressure is applied to the pipe, but the outer peripheral shape of the detachable nut 13 is made to further facilitate the detaching operation. It is recommended that the wrench be formed on the 6 sides of the spanner and that each surface be knurled so that it can be easily turned with bare hands. Further, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0018]

As described in detail in the above-mentioned one embodiment, in the invention according to claim 1, the positioning ring is provided around the male screw at a predetermined position so that the detachable nut contacts the positioning ring. By screwing until they come into contact, not only can the reliable determination of whether the coupling is completely connected, but also the presence or absence of looseness of the detachable nut during operation can be easily visually confirmed. In addition, the loosening prevention nut screwed inside the positioning ring is crimped to the removable nut through the positioning ring to prevent the removable nut from loosening due to vibration during operation as much as possible. You can

Further, in the invention as claimed in claim 2, the packing is provided around the socket or the spigot at a predetermined position so that the packing is pressed against the socket and the spigot, and then the self-sealing valve of the socket is provided. Since the self-sealing valve of the spigot is configured to come into contact and start opening, oil etc. in the pipe will be confined by the packing, preventing oil etc. from leaking outside when the coupling is attached / detached. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention at the time of separation.

FIG. 2 shows a state in the middle of connection in FIG. 1, and
Sectional drawing which shows the state when the self-sealing valve of a socket and the self-sealing valve of a spigot contact | abut.

3 is a cross-sectional view showing a completely connected state in FIG.

[Explanation of symbols]

 1 Socket 2 Spigot 3 Coupling 8 and 9 Self-sealing valve 12 Male screw 13 Detachable nut 16 Positioning ring 17 Locking nut 19 O-ring

Claims (2)

[Claims] 1. A coupling in which a self-sealing valve is provided in each of the socket and the spigot, and when the socket and the spigot are connected, the self-sealing valves press each other to open. In a coupling in which a male screw is engraved on the outer peripheral surface of the socket, and a base end portion of a removable nut screwed with the male screw is rotatably fitted along the outer periphery of the spigot, By surrounding the positioning ring at a predetermined position and screwing the removable nut onto the male screw, when the removable nut contacts the positioning ring, the self-sealing valve is in an open state, Further, a coupling nut is screwed inside the male screw through the positioning ring of the male screw. 2. A coupling in which a self-sealing valve is provided in each of the socket and the spigot, and when the socket and the spigot are connected, the self-sealing valves press each other to open. When a packing is provided around a predetermined position of the socket bore or the outer circumference of the spigot, and the socket and the spigot are connected, after the packing is pressed by the socket and the spigot, the self-sealing valve of the socket and the self of the spigot A coupling which is in contact with a seal valve.