JP2872931B2 - Coupling - Google Patents

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 a hydraulic pipe or the like, and more particularly, to a coupling for connecting a self-sealing valve to both a socket and a spigot so that the self-sealing valves can be connected to each other at the time of connection. The present invention relates to a coupling that opens by pressing.

[0002]

2. Description of the Related Art A quick coupling (quick disconnect coupling) or a screw-in type coupling which can be connected with one touch is used as a coupling for interconnecting flexible hydraulic piping and the like using a self-sealing valve. ing. In each case, a self-sealing valve is provided in each of the socket and the spigot, and when separated, each self-sealing valve closes the outlet of the socket or spigot, and when connected, each self-sealing valve presses each other to open. It is supposed to.

[0003] The quick coupling has a detachable ring mounted on the outer periphery of the socket, and is formed so that the socket and the spigot can be detached and attached with one touch by sliding the detachable ring along the axial direction of the socket. Have been. 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 detachable nut is loosely fitted loosely along the outer periphery of the spigot. The male screw and the detachable nut are screwed together to connect the socket and the spigot.

[0004] The quick coupling can be quickly attached and detached, but since the manual power is applied linearly to the contact surfaces of the self-sealing valves of both the socket and the spigot to open, the internal pressure acts on the piping. Sometimes, the self-sealing valve does not open unless human power exceeding its internal pressure is applied. Therefore, connection is difficult when the internal pressure is high. On the other hand, in the case of a screw-in type coupling, torque is applied to a detachable nut, and the torque is converted into a linear force by a screw mechanism to open the self-sealing valve. Can be easily connected.

[0005]

When determining whether or not the coupling is completely connected, the quick coupling cannot be known unless pressure is applied to the piping. In addition, although the screw-in type coupling can be judged to some extent by the reaction force of the detachable nut, it cannot be said that it is a reliable judgment method because human power varies from person to person.

[0006] Further, the screw-in type coupling may loosen the detachable nut due to vibration during operation, and may cause a poor connection. Further, when these couplings are to be connected, the self-sealing valve starts to be opened before the coupling is completely connected yet, so that there is a structural defect that oil or the like in the pipe leaks.

[0007] Therefore, there is a technical problem to be solved that can easily determine the connection state, prevent connection failure due to vibration, and prevent leakage of oil and the like when attaching and detaching. It is an object of the present invention to solve the problem.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems, and has a self-sealing valve provided inside a socket and a spigot, respectively, and connecting the socket and the spigot. At the same time, the respective self-sealing valves are mutually pressed and opened , and a male screw is engraved on the outer peripheral surface of the socket , and the base end of the detachable nut screwed to the male screw is formed along the outer periphery of the spigot. In the coupling rotatably and loosely fitted, a positioning ring is provided around a predetermined position of the male screw, and the detachable nut is screwed into the male screw, whereby the detachable nut is positioned. When the self-sealing valve is in contact with the ring, each of the self-sealing valves is in an open state, and furthermore, a coupling in which a locking nut is screwed inside through the positioning ring of the male screw, and Socket lumen or of the coupling is provided around a packing on the outer periphery of the spigot, and, after the package <br/> Kin is pressed into the socket and spigot, and the self-sealing valve of the self-sealing valve and spigot socket To provide a coupling which is provided at a position where the coupling can abut.

[0009]

According to the first aspect of the invention, if the detachable nut is screwed into the positioning ring until it comes into contact with the positioning ring, the self-sealing valves of both the socket and the spigot are opened and each of them is securely connected. I can judge. If the lock nut is tightened in the direction of the detachable nut, the detachable nut and the lock nut have a double nut structure via the positioning ring, preventing the detachable nut from loosening due to vibration during operation. can do.

According to the second aspect of the present invention, the self-sealing valve of the socket and the self-sealing valve of the spigot are not yet used until the end of the spigot or the socket reaches the packing peripheral position at the time of connection. Because it is not in contact
Both valves are closed so that oil and the like in the piping do not leak.
When the end of the spigot or socket is further connected beyond the packing peripheral position, both self-sealing valves abut and start to open. However, at this time, since the gap between the joint surfaces of the socket and the spigot is sealed with packing, the oil or the like does not leak to the outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail 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.
Brackets 4 and 5 extend from the inner wall toward the center in the lumens of the socket 1 and the spigot 2, respectively, and cylinders 6 and 7 are arranged at the center ends thereof. Self-sealing valves 8 and 9 are inserted through the cylinders 6 and 7, respectively. The self-sealing valves 8 and 9 are urged by springs 10 and 11, respectively, so that the connection side outlets of the socket 1 and the spigot 2 are connected. Are closed respectively.

A male screw 12 is engraved on the outer peripheral surface of the socket 1 on the connection side, and a detachable nut 13 screwed to the male screw 12 is mounted on the outer periphery of the spigot 2 on the connection side. A convex portion 14 is provided around the base end (the end 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 on the outer peripheral surface of the spigot 2. Has been established. When the projection 14 and the recess 15 are engaged and slid, the detachable nut 13 is rotatably formed along the outer periphery of the spigot 2.

At a predetermined position in the middle of the male screw 12 of the socket 1, a positioning ring 16 is provided around the male screw 12 in which the engraving of the male screw 12 is interrupted. The male screw 12
A locking nut 17 is screwed inward (on the pipe connection side) via the positioning ring 16. Further, a groove 18 is provided around a predetermined position of the lumen near the connection side end of the socket 1, and an O-ring 19 is implanted in the groove 18.

When the socket 1 is connected to the spigot 2 by screwing the detachable nut 13 to the male screw 12, first, as shown in FIG. When the part 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. When the spigot 2 is further inserted into the inner space 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 are shut off by the self-sealing valves 8, 9, and the self-sealing valves 8, 9 are opened. When the oil or the like in the pipe flows through the coupling 3, the gap between the joint surfaces of the socket 1 and the spigot 2 is closed by the O-ring 19. Thus, leakage of oil or the like when the coupling 3 is attached or detached is prevented. The same effect can be obtained by providing the O-ring 19 on the outer peripheral surface near the end of the spigot 2 on the connection side.

Further, when the detachable nut 13 is further screwed, as shown in FIG. 3, the detachable nut 13 comes into contact with the positioning ring 16 and cannot be further tightened. At this time, the self-sealing valves 8 and 9 are fully open with each other. Thus, the operator can not only know whether the coupling 3 is completely connected by the reaction force of the detachable nut 13 but also visually check whether the detachable nut 13 is in contact with the positioning ring 16. The connection state of the coupling 3 can be determined. In addition, whether or not the detachable nut 13 is loosened during operation as well as at the time of detachment can be easily confirmed simply by visually checking whether or not the detachable nut 13 is in contact with the positioning ring 16.

After the nut 13 is screwed until it comes into contact with the positioning ring 16, the locking nut 17 is tightened in the direction of the mounting nut 13, and the locking nut 17 is detached from the locking nut 17. The nut 13 is crimped. As a result, the two have a double nut structure, and the detachable nut 13 does not loosen easily, so that the coupling 3 is not vibrated.
Can be prevented from becoming defective.

Since the coupling 3 is a screw-in type, it can be easily connected even if an internal pressure acts on the pipe. However, in order to further facilitate the attaching / detaching operation, the outer shape of the detachable nut 13 is formed. Is formed on the six surfaces for the spanner, and each surface is preferably knurled so that it can be easily turned with bare hands. In addition, 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 ones.

[0018]

As will be described in detail in the above embodiment, in the first aspect of the present invention, a positioning ring is provided at a predetermined position of a male screw so that a detachable nut is applied to the positioning ring. If the coupling is screwed until it comes into contact, not only can it be surely determined whether the coupling has been completely connected, but also the presence or absence of looseness of the detachable nut during operation can be easily confirmed visually. Further, by pressing a locking nut screwed inside the positioning ring to the detachable nut via the positioning ring, the detachable nut is prevented from loosening due to vibration during operation as much as possible. Can be.

Further, according to the present invention, by arranging the packing around a predetermined position of the socket or the spigot, the packing is pressed by the socket and the spigot, and then the self-sealing valve of the socket is closed. Since the spigot is configured such that the self-sealing valve of the spigot comes into contact with the spigot and starts to open, the oil and the like in the pipes are confined by the packing, and the oil and the like are prevented from leaking to the outside when the coupling is attached and detached. Can be.

[Brief description of the 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.

FIG. 3 is a sectional view showing a completely connected state in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 socket 2 spigot 3 coupling 8, 9 self-sealing valve 12 male screw 13 detachable nut 16 positioning ring 17 locking nut 19 O-ring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16L 29/00 F16L 37/28

Claims (2)

(57) [Claims] 1. When a self-sealing valve is provided in a socket and a spigot, respectively, and when the socket and the spigot are connected to each other, the respective self-sealing valves are mutually pressed and opened , and the outer periphery of the socket is provided. A male screw is engraved on the surface, and a proximal end of a detachable nut that is screwed to the male screw is loosely fitted along the outer periphery of the spigot in a freely rotatable manner at a predetermined position of the male screw. By providing a positioning ring, and by screwing the detachable nut to the male screw, when the detachable nut comes into contact with the positioning ring, the self-sealing valves are in an open state, respectively, A coupling in which a locking nut is screwed inside the male screw via the positioning ring. 2. A self-sealing valve for the socket and a self-sealing valve for the spigot after a packing is provided around the socket bore of the coupling or the outer periphery of the spigot, and the packing is pressed by the socket and the spigot. 2. The coupling according to claim 1, wherein the coupling is provided at a position where it can abut.