JP2003021289A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint allowing reliably attaching/detaching a plug even when foreign matter such as urethane is attached and solidified in an annular groove for locking a lock ball of the plug and reliably preventing back flow of fluid regardless of connection of the plug. SOLUTION: A slit 3 is axially formed on a tapered hole 2 of a socket 1 forming this pipe joint in order to outward expand a tip part of the socket 1, and a check valve mechanism 10 is internally provided inside the socket 1. A tip part of the plug 20 is formed approximately in a tapered shape, and the base end outer diameter is formed to be slightly larger than inside diameter of the socket 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for connecting not only fluid pipes such as water but also viscous fluid pipes such as urethane, silica resin and mortar.

[0002]

2. Description of the Related Art Conventionally, many pipe joints of this type have been proposed such as Japanese Utility Model Publication No. 57-40398, and an example thereof will be described with reference to FIG. That is, in the figure, 51 is a cylindrical socket, 52 is a required number of small-diameter taper holes formed at the tip of the socket 51, and 53 is each taper hole in a state of protruding into the socket 51. A lock ball 52 is loosely fitted and held in 52, and a sleeve 54 is slidably fitted to the tip of the socket 1 via a spring 55.
Is a relief portion formed on the inner peripheral surface of the tip edge of the sleeve 54,
Reference numeral 57 is a lock ball pressing portion which is connected to the escape portion 56 and is projected on the inner peripheral surface of the sleeve 54, and 58 is locked to the escape portion 56 to prevent the sleeve 54 from being pulled out. Socket 5
1 is a stop ring fitted to the outer peripheral surface of the tip end portion, 59 is an O-ring mounted to the inner peripheral surface of the socket 51 substantially in the center portion, 60 is a valve element installed in the socket 51 via a spring 61, and 62 is A valve seat of the valve body 60, and 63 is a cylindrical hose receiving portion screwed into the rear end portion of the socket 51. 6
Reference numeral 4 denotes a cylindrical plug which can be airtightly inserted into the socket 51, 65 denotes an annular groove for locking a lock ball formed on an outer periphery of a front portion of the plug 64, and 66 denotes a rear portion of the plug 64. Hose connection part.

In connecting the socket 51 and the plug 64 in the pipe joint constructed as described above, first,
The sleeve 54 is slid toward the rear end against the bias of the spring 55, and the lock ball 53 is positioned at the escape portion 56. After that, the plug 64 is inserted into the socket 51, and the sleeve 54 is released when the annular groove 65 is aligned with the lock ball 53. Then, the sleeve 54 is urged by the spring 55 to return to the original state, and the lock ball pressing portion 57 presses the lock ball 53 in the centripetal direction to surely connect the socket 51 and the plug 64. Then, by inserting the plug 64, the valve body 60 is pressed toward the rear end to connect the fluid passages.

On the contrary, when the connection between the socket 51 and the plug 64 is released, the sleeve 54 is slid toward the rear end against the bias of the spring 55 as in the connection. Release the ball presser 57 and lock the ball 5
The plug 64 is removed while the valve 3 is positioned in the escape portion 56, and the valve body 60 is returned to the original state to shut off the fluid passage.

[0005]

In the pipe joint constructed as described above, the plug 64 can be connected to the socket 51 in an airtight and reliable manner, so that there is no problem in the case of a fluid such as water. Urethane and silica resin,
Alternatively, in the case of a viscous fluid such as mortar, when the plug 64 and the socket 51 are separated during pressure-feeding of the viscous fluid, backflow occurs due to back pressure, and the fluid that has flowed out adheres to the outer peripheral surface of the ket 51 and the plug 64 and changes over time. Solidify into
As a foreign substance, it is likely to interfere with the operation of inserting and removing the plug 64. Then, for example, the lock button of the plug 64
When the lock ball 53 is stuck in the annular groove 65 for locking the lock, the lock ball 53 cannot be securely fitted and locked, and the lock ball 53 projects outward more than necessary and the sleeve 54 returns. This hinders the operation, and eventually the connection between the socket 51 and the plug 64 becomes impossible. Further, since the socket 51 is merely provided with the valve body 60 therein, it is not possible to prevent the reverse flow of the fluid under the connected state of the socket 51 and the plug 64, and also the socket 51 and the plug 64. When the plug 64 is disengaged while the high-pressure fluid is sealed in the connection state, the fluid flows backward due to the back pressure.

The present invention solves the above conventional problems,
Even if foreign matter such as urethane adheres to and solidifies in the lock ball locking annular groove of the plug, the plug can be securely inserted and removed, and the reverse flow of the fluid regardless of whether the plug is connected or not. The present invention is intended to provide a pipe joint capable of reliably preventing the above.

[0007]

SUMMARY OF THE INVENTION That is, according to the invention described in claim 1, a cylindrical socket 1 in which a lock ball 4 is loosely fitted and held in a front portion through a taper hole 2, and the socket 1 is provided. Cylindrical plug having a sleeve 5 slidably fitted on the outer periphery of the front end of the plug 5 and an annular groove 21 for locking a lock ball on the outer peripheral surface of the socket 1 which can be inserted and removed. In the pipe joint, which is composed of No. 20, the lock ball 4 is engaged with and disengaged from the annular groove 21 by the sleeve 5 so as to detachably connect the socket 1 and the plug 20.
A slit 3 is formed in the taper hole 2 in the axial direction in order to expand the tip of the socket 1 outward, and a check valve mechanism 10 is provided in the socket 1. On the other hand, the main feature of the plug 20 is that the tip of the plug 20 is formed in a substantially tapered shape and the outer diameter of the proximal end thereof is slightly larger than the inner diameter of the socket 1. Is.

When connecting the socket 1 and the plug 20, the plug 20 is forcibly inserted into the socket 1. Then, since the socket 1 is formed with the slit 3, the socket 1 is expanded outward together with the taper hole 2, and the held lock ball 4 is moved inward to move the annular groove 21 of the plug 20.
And the sleeve 5 is released, the released sleeve 5 is biased by the spring 6 and automatically slides in the distal direction to press the lock ball 4 in the centripetal direction. Fix it. At this time, even when a foreign substance A such as urethane adheres to the annular groove 21 and solidifies, the sleeve 5 pushes the lock ball 4 while pressing it, and the socket 1 is expanded along the slit 3 from the tip of the socket 1. Since it can be released to the outside, the lock ball 4 can be securely fitted and locked in the annular groove 21. Further, even when the foreign matter A such as urethane adheres to the annular groove 21 and solidifies, and the fitting and locking is insufficient only with the urging force of the spring 6, the stop ring 8 is visually recognized from the outside from the position of the sleeve 5. Since it is possible to easily confirm that the fitting is insufficient, it is not only possible to securely fit and lock the sleeve 5 by forcibly sliding it with a hand, but Even when the backflow occurs, the check valve mechanism 10 can reliably prevent the backflow.

According to a second aspect of the invention, the check valve mechanism 10 is provided.
The pipe joint according to claim 1 is characterized in that a groove-shaped auxiliary outflow passage 16 of a required line is formed in the outflow passage 15 in the direction of the outflow.

Further, even when an excessive fluid pressure acts on the valve body 17 which constitutes the check valve mechanism 10, the valve body 17
Not only allows a constant amount to flow out through the auxiliary outflow passage 16 without limiting the outflow amount, but also allows a constant amount to always flow out through the auxiliary outflow passage 16 even when the spring 18 is completely compressed. Can be done.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below based on an embodiment shown in the drawings. 1 to 4 show an embodiment of the present invention, in which 1 is a cylindrical socket having a small-diameter tip portion, and 2 is a tip portion of the socket 1 at equal intervals. Long taper holes formed in the same circumferential shape, 3 is a required number of slits formed from the tip of the socket 1 toward the rear end through each taper hole 2, and 4 is the outside of the socket 1. A lock ball 5 which is loosely fitted and held in each taper hole 2 in a partially projected state is a sleeve which is slidably fitted to the outer periphery of the front end of the socket 1 via a spring 6,
Reference numeral 23 denotes a handle formed in an annular shape on the outer peripheral surface of the sleeve 5.
Reference numeral 7 denotes a locking portion formed in a substantially step shape on the tip edge of the sleeve 5, and by locking the locking portion 7 to the lock ball 4, the sleeve 5 is moved toward the tip of the socket 1. Sliding is regulated. 8 is a stop ring fitted to the outer peripheral surface of the tip of the socket 1 to prevent the sleeve 5 from being pulled out, and 9 is a 0 ring mounted to the inner peripheral surface of the socket 1.
10 is a substantially in-line check valve mechanism provided in the socket 1, 11 is a valve chamber constituting the check valve mechanism 10,
The valve chamber 11 is a stopper-12 screwed into the socket 1.
It is divided and formed by. Reference numeral 13 denotes an inflow passage in which the tip of the valve chamber 11 communicates with the alligator valve seat 14;
The outflow passage is formed along the center line of the stopper 12 so that the base end of the outflow passage communicates with the alligator, and the reference numeral 16 indicates a groove shape of a required line formed radially toward the outside so as to communicate with the outflow passage 15. Auxiliary outflow passage, 17 is a ball mounted in the valve chamber 11
A valve element 18 is a spring for constantly urging the valve element 17 toward the inflow passage 13. Reference numeral 19 is a cylindrical hose receiving portion screwed into the rear end portion of the socket 1.

Reference numeral 20 denotes a cylindrical plug which can be inserted into and removed from the socket 1 in an airtight manner. The plug 20 has a taper-shaped tip portion, and the outer diameter of the base end portion of the socket 1. It is slightly larger than the inner diameter. Reference numeral 21 is an annular groove for locking the lock ball formed on the outer periphery of the front portion of the plug 20, and 22 is a hose connecting portion screwed to the rear end portion of the plug 20. In addition, A indicates a foreign substance such as urethane.

Next, the operation of the embodiment constructed as described above will be explained. First, when connecting the socket 1 and the plug 20, the plug 20 is forcibly inserted into the socket 1 without operating the sleeve 5.
Then, since the socket 1 has the slit 3 formed therein, the socket 1 is expanded outwardly together with the taper hole 2 and held by the lock body.
The ruler 4 moves inward to fit and lock in the annular groove 21 of the plug 20, and the sleeve 5 is unlocked, and the released sleeve 5 is automatically urged by the spring 6 to be released. Then, the lock ball 4 is pressed and fixed in the centripetal direction by sliding in the tip direction.
At this time, even when a foreign substance A such as urethane adheres to the annular groove 21, as shown in FIG. 4, the lock ball 4 is pushed by the sleeve 5 to be extruded, and the socket expanded along the slit 3 is opened. Since it can be released outward from the first end, the lock ball 4 can be securely fitted and locked in the annular groove 21. Further, even when foreign matter A such as urethane adheres to the annular groove 21 and the sleeve 5 cannot be slid only by the urging force of the spring 6, the sleeve 23 is forced to grip the handle 23. It can be fitted and locked by sliding it mechanically. Moreover, since the handle 23 itself is annularly formed on the outer peripheral surface of the sleeve 5, when the foreign matter A adheres to the outer peripheral surface of the sleeve 5 and is slippery even when wearing thick gloves. Even in the case of, the sliding operation can be easily performed.

When the connection between the socket 1 and the plug 20 is completed, a required fluid is caused to flow from the plug 20 into the inflow passage 13 of the socket 1. Then, the valve body 1 is caused by the fluid pressure.
7 is pressed against the urging force of the spring 18 toward the outflow passage 15 and flows into the valve chamber 11, and then sequentially flows out to the outflow passage 15 and the auxiliary outflow passage 16. At this time, even if the flow pressure of the fluid acts excessively and the valve body 17 presses the outflow passage 15 excessively against the bias of the spring 18, the outflow amount is restricted by the valve body 17. It is possible to always reliably discharge a certain amount through the auxiliary outflow passage 16 (see FIG. 4). When a reverse flow of fluid occurs, the inflow passage 13 presses the inflow passage 13 against the valve body 17 by the bias of the spring 18 regardless of whether the socket 1 and the plug 20 are connected or not. It can be shut off to reliably prevent backflow. Further, since the base end portion of the spring 18 is hooked and supported by the stopper 12, it is possible to surely prevent the play of the spring 18 and thus to prevent the valve body 17 from being constantly shaken in the radial direction. Of course, even if two fluids are made to flow in at the same time, they can be made to flow out without being mixed (see FIG. 3).

On the contrary, when the connection between the socket 1 and the plug 20 is released, the sleeve 5 is pushed against the urging force of the spring 6 toward the rear end of the socket 1 to be slid.
Remove the plug 20. Then, the socket 1 in the expanded state is reduced together with the taper hole 2 to return to the original state, and the held lock ball 4 is pushed outward to be locked to the tip of the sleeve 5 (Fig. 2).

Although the above-described embodiment shows a substantially in-line check valve mechanism 10, the check valve mechanism is not limited to such a shape, and other known check valve mechanisms may be adopted. It is a thing.

[0017]

According to the invention described in claim 1, the taper hole 2 forming the pipe joint is axially oriented so as to expand the tip of the socket 1 outwardly. The slit 3 is formed, and the check valve mechanism 10 is internally provided in the socket 1. On the other hand, the plug 20 has a substantially taper-shaped front end and the socket 1 has a base end outer diameter. Since the foreign material A such as urethane adheres to and solidifies in the annular groove 21 and is insufficiently fitted and locked only by the biasing force of the spring 6, the sleeve 5 is formed. Since the stop ring 8 can be visually recognized from the outside from the position, it can be easily confirmed that the fitting is insufficient. Therefore, the sleeve 5 is forcibly slid by hand and the plug 20 is forced into the socket 1. By inserting it into the sleeve In has been Rokkubo - while pressing the Le 4 extrusion, socket was allowed expanded along the slit 3 1
Since it can be released outward from the tip,
The socket 4 with the ring 4 securely fitted and locked in the annular groove 21.
Not only can the plug and the plug 20 be reliably inserted and removed, but the check valve mechanism 10 can surely prevent the backflow even when the backflow of the fluid occurs during use. , High pressure (normal operating pressure 3.0
(MPa).

According to the second aspect of the present invention, the groove-shaped auxiliary outflow passage 16 of a required line is formed in the outflow passage 15 of the check valve mechanism 10 in the direction of the outflow according to the above. Even when an excessive fluid pressure acts on the valve element 17, not only the valve element 17 does not limit the outflow rate, but a constant amount can be always discharged through the auxiliary outflow passage 16, and the spring 18 can be completely discharged. Even in a compressed state, it is possible to always discharge a fixed amount through the auxiliary outflow passage 16.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a socket 1 showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of the present invention.

3 is a cross-sectional view taken along the line I-I of FIG.

FIG. 4 is a vertical sectional view showing an operating state of the embodiment.

FIG. 5 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

1 socket 2 taper holes 3 slits 4 rock ball 5 sleeves 6 spring 10 Check valve mechanism 15 Outflow path 16 Auxiliary outflow 20 plugs 21 annular groove A foreign body

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 000145471             Togawa Rubber Co., Ltd.             4-5 Minamihorie, Nishi-ku, Osaka-shi, Osaka (72) Inventor Shinsuke Sasaki             25-32 Tamate-cho, Kashiwara City, Osaka Prefecture             Saki Giken (72) Inventor Tatsuo Miura             1-247 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka               Kubota Concrete Co., Ltd. (72) Inventor Masaru Tomisaka             1-247 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka               Kubota Concrete Co., Ltd. (72) Inventor Hitoshi Imahori             1-27-10 Hositakita, Katano, Osaka Prefecture             Within Lux Corporation (72) Inventor Koichi Ueoka             1-27-10 Hositakita, Katano, Osaka Prefecture             Within Lux Corporation (72) Inventor Tomoaki Oda             516 Kamino, Sakai City, Osaka Prefecture Tokawago Co., Ltd.             Mu Sakai Factory F term (reference) 3J106 AB01 BA01 BB01 BC04 BD01                       BE40 CA01 EA03 EB07 EC02                       EC07 ED32 EF04 EF05 GA01                       GA05 GA24

Claims (2)

[Claims] 1. A lock ball 4 having a taper hole 2 at a front end thereof.
Is a loosely fitted cylindrical socket 1, a sleeve 5 slidably fitted to the outer periphery of the front end of the socket 1 via a spring 6, and an outer periphery that is freely inserted into and removed from the socket 1. It is composed of a cylindrical plug 20 having an annular groove 21 for locking a lock ball on its surface, and by engaging and disengaging the lock ball 4 with the annular groove 21 by means of the sleeve 5, the socket 1 and the plug 20 are separated. In a pipe joint that can be detachably connected, a slit 3 is formed in the taper hole 2 in the axial direction so as to expand the tip of the socket 1 to the outside, and a reverse slit is formed in the socket 1. The stop valve mechanism 10 is internally provided, and on the other hand, the plug 20 is formed such that the tip portion thereof is formed in a substantially taper shape and the base end outer diameter thereof is slightly larger than the inner diameter of the socket 1. Yes, pipe fittings. 2. The pipe joint according to claim 1, wherein a groove-shaped auxiliary outflow passage 16 is formed in the outflow passage 15 of the check valve mechanism 10 in the direction of the outflow. .