JPH0633276Y2 - Self-sealing pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a self-sealing type pipe joint used for piping of fluid utilization equipment such as an air conditioner.

(Prior Art) As a pipe joint for a fluid conduit of an air conditioner or the like, as shown in FIG. 5, an annular groove n is formed in an end face of an inwardly thick portion on the coupling side of a male joint B ', and a cross section thereof is formed therein. The triangular metal seal ring m
It is press-fitted so that the top edge of its outer periphery is in close contact with the outer inner peripheral surface of the concave groove n and the bottom one side edge is in close contact with the inner surface of the concave groove n. A large diameter union nut 3'is screwed onto the male body 5'of the male joint B'and the fixed valve body 2'in the female body 1'makes the male body 5 '.
The movable valve element 6'inside is retracted as shown to open the flow path, while the tip of the tubular slide valve 4'in the female body 1'is brought into pressure contact with the end face of the thick portion of the male body 5 '. At the same time, the other side edge of the metal sealing ring m in the male body 5'is made to fit into the end face on the coupling side of the female body 1'to prevent internal fluid from leaking to the outside. Known by.

(Problems to be solved by the invention) By the way, in the above-mentioned conventional pipe joint, the sealing effect by the metal sealing ring is excellent, but it takes time to process a ring body having a triangular cross section with sharp corners, In addition, it takes skill to press-fit so that the bottom side is parallel to the axis of the main body, and since metal is forced in when connecting the female and male main bodies, considerable thrust (tightening torque) is required The union nut must be rotated several times with a tightening tool and screwed into the male body, which is inefficient and difficult to use in narrow spaces.

Therefore, this invention provides a self-sealing pipe joint that can obtain a sufficient sealing effect without using an expensive and difficult-to-process sealing ring, and can easily and quickly connect and disconnect the female and male bodies without using tools. It is provided.

(Means for Solving the Problems) Based on the above-mentioned object, the present invention provides a self-sealing type pipe joint in which a sliding valve is fitted to the inside by spring-biasing the coupling side and has a mushroom shape. A stepped portion having an edge and an annular groove are provided in the central portion of the outer periphery of the female body provided with the fixed valve body, and the inlet side of the coupling side end and the intermediate spiral part and the reverse part are provided on the outer side of the female body through the annular groove. A female joint in which a lock sleeve provided with a plurality of spiral cutouts composed of facing spiral ends is rotatably attached,
A mushroom-shaped movable valve body is internally provided with a spring biased toward the coupling side, and an inwardly projecting ridge having a tapered surface with which the movable valve body abuts is provided at the inner center of the male body. An annular groove is formed in the center of the inner surface of the tubular portion on the coupling side, and an elastic O-ring for sealing the female body and a gasket made of synthetic resin are arranged in the annular groove by a coil spring to urge the coupling side. At the same time, it is characterized in that it is constituted by a male joint in which a plurality of lock pins corresponding to the above-mentioned notches are planted on the central portion of the male body.

(Operation) When the lock sleeve is inserted into the male body by aligning the inlets of the spiral cutouts of the female lock sleeve with the positions of the lock pins on the male body, the head of the female fixed valve body is inserted. The end face abuts on the head of the male movable valve body and the tip face of the female slide valve abuts on the inner peripheral edge of the inward projection of the male body.At this time, each lock pin is attached to the middle spiral part of the notch. In the moving position, when the lock sleeve is rotated clockwise, the female joint is guided by the intermediate spiral portion of the notch and advances. As a result, the female sliding valve is relatively retracted while the inward projection is in pressure contact with it, and the male movable valve element is pushed back by the female fixed valve element, causing the flow path in the joint to move. When opened, continued rotation of the lock sleeve engages the lock pin with the opposite helical end of the notch to connect the female and male joints. At that time, the elastic O-ring provided in the coupling side cylinder portion of the male body closely fits on the female body, and the gasket repels the edge of the annular groove and the edge of the stepped portion on the female body by the repulsive force of the coil spring. Is crimped to.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows a female joint A and a male joint B separately, and a female body 1 is a tubular body having openings at both ends, and a tube body 2 which is conically narrowed at a pipe connection side is fixed by brazing. At its small diameter end, one conduit p connected to a fluid source or equipment
Are connected to each other, and an intermediate step portion 1a having a substantially right-angled edge 11e and an outer step portion 1b having a larger diameter than the intermediate step portion 1a are provided, and an annular groove 1c is provided. The sideways cup-shaped lock sleeve 3 is fitted,
An inward annular end portion 3a on the pipe side is rotatably caulked to the annular concave groove 1c of the female body 1.

As shown in FIG. 2, the lock sleeve 3 is provided with a plurality of (two in the figure) spiral cutouts 3b extending slightly longer than a quarter circumference from the end face on the coupling side. 3b consists intermediate helical portion 3b ₂ and the opposite short helical end 3b ₃ toward the pipe side followed by a short inlet section 3b ₁ along the axis.

Further, inside the female body 1, a stationary valve body 5 of a tubular slide valve 4 which is slidable in contact with the inner surface thereof is disposed, and an elastic seal is provided on the end face of the sliding valve 4 on the coupling side. The material 4a is attached, and an elastic O-ring 4b that is in close contact with the inner surface of the female body is embedded in the outer peripheral surface on the piping side. Further, the proximal end of the fixed valve body 5 on the piping side is connected to the end surface of the female body 1 and the tube body. It is crimped to the center of a tripod retainer 7 whose peripheral portion is sandwiched between the retainer 7 and the end face of the sliding valve 4 on the pipe side. Is a coil spring 6
Is provided, and the sliding valve 4 is driven by the spring force of the coil spring 6.
Is urged in the connecting direction, and the elastic seal member 4a on the connecting side end face is pressed against the peripheral portion of the head portion of the fixed valve body 5 by the spring force to prevent the internal fluid from leaking when the joint is separated.

On the other hand, the male body 11 is a stepped tubular body having openings at both ends, and a conical tube body 12 is fixed to the pipe connection side by brazing, and the other conduit p is connected to a device or a fluid source at the small diameter end. Is connected, and the inner side of the ring-shaped ridge 1 has a tapered side surface 11c on the pipe side at the center.
1a is provided, so that the coupling-side tube portion 11b has a female body 1
It has a large diameter hole into which the outer stepped portion 1b can be fitted and is thinner than the other, and an annular groove 11d of a required width is formed in the central portion of the inner surface of this coupling side tubular portion 11b, and nylon etc. An annular gasket 16 having an inverted V-shaped or arcuate cross section, an elastic O-ring 17 such as rubber, and a collar 18 are fitted with the synthetic resin material of FIG.
The gasket 16 is urged toward the coupling side by a coil spring 19 disposed between the gasket 16 and a, and the gasket 16 is pressed against the edge 11e of the annular groove 11d.

In addition, a mushroom-shaped movable valve body 13 is disposed in the male body 11, and its shaft rod portion is an inward beat portion of the tube body 12.
A coil spring 15 is slidably inserted into the center of a tripod-shaped retainer 14 fixed by 12a, and is arranged between the retainer 14 and a guide ring 13b provided on the valve head 13a. The elastic sealing material 13c, which is biased to the coupling side and adhered to the end face of the head when the joint is separated, is pressed against the tapered surface 11c of the inward projection 11a of the male body 11 to prevent leakage of the internal fluid. .

The same number of lock pins 20 as the cutouts 3b formed in the female lock sleeve 3 are radially planted on the outer periphery of the central portion of the male body 11 so as to correspond to the cutouts 3b.

Next, the connecting operation of the female and male joints A and B will be described.
First, the lock sleeve 3 is inserted into the male main body 11 by aligning the positions of the inlet portions 3b ₁ of the respective spiral cutouts 3b of the female lock sleeve 3 with the respective lock pins 20 on the male main body. The head end surface of the fixed valve body 5 contacts the elastic seal material 13c on the head end surface of the male movable valve body 13 and the elastic seal material 4a on the tip surface of the female slide valve 4 faces inward of the male body. It contacts the inner peripheral edge of the protrusion 11a.

At this point, each lock pin 20 extends from the linear inlet portion 3b ₁ of each notch 3b of the lock sleeve 3 to the intermediate spiral portion 3b.
_{When the} lock sleeve 3 is rotated clockwise toward the male joint B at that position, the female joint A is guided by the intermediate spiral portion 3b ₂ of the notch 3b and moves forward. .

Therefore, as shown in FIG. 3, the female sliding valve 4 compresses the coil spring 6 that biases the sliding valve 4 toward the fixed side, while fixing the fixed valve body 5.
Of the elastic seal member 4a at the tip end surface thereof is pressed against the inner peripheral edge of the inwardly projecting ridge 11a in the male body by a spring force. , Leakage of internal fluid to the outside is prevented, and under that condition,
The movable valve body 13 on the male side is pushed by the fixed valve body 5 on the female side to retract while compressing the coil spring 15, and the flow passages in the female and male joints are opened.

Further, when the locking sleeve 3 will rotate in the same direction, the lock pin 20 enters the reverse spiral portion 3b _3, the female will be engaged therein, so that the male fitting A, B is shown Be combined.

On the other hand, in the above process, the elastic O-ring 17 and the annular gasket 1 assembled in the annular groove 11d of the male body 11 are assembled.
6 is closely fitted on the peripheral surface of the coupling side end of the female body 1, and in cooperation with the slide valve 4 seals the inside of the joint, and when the coupling is completed, the gasket 16 As shown in FIG. 4, the reduction repulsive force of the coil spring 19 urging the coupling side pushes the edge 11e of the annular groove 11d and the edge 1e of the intermediate step 1a of the female body 1 so that the edge 1
e and 11e are difficult to fit in the gasket 16 to more securely seal the internal fluid. By the biting of the edges 1e and 11e into the gasket 16, even if there is a fluid that has permeated the elastic O-ring 17, the leakage thereof to the outside can be reliably prevented.

Further, when the lock sleeve 3 is rotated counterclockwise in the coupled state of FIG. 3, the lock pin 20 reverses the spiral cutout 3b by the restoring force of the female coil spring 6 and the male coil spring 15. The female and male joints A and B are separated by sliding in the direction, and at this time, the female side slide valve 4 relatively advances the female main body 1 and its tip elastic seal material 4a. While being pressed against the head of the fixed valve body 5 to seal the inside of the female body, the movable valve body 13 on the male side also advances toward the coupling side, and the elastic seal material 13c at the head end of the movable valve body 13 on the male side moves toward the inward projection 11a. The male body is sealed by being pressed against the taper surface 11c of.

(Effect of the Invention) As described above, in the present invention, the lock sleeve rotatably mounted on the male body is provided with a plurality of spiral notches, while the corresponding lock pin is planted on the male body. Female, due to the engagement relationship between the spiral cutout and the lock pin,
Since the male joint is connected and disconnected, both joints can be easily and quickly connected and disconnected by rotating the lock sleeve about half a turn.Compared with conventional union nuts that are screwed in several turns. The working efficiency can be improved, and an elastic O-ring and a synthetic resin gasket are provided in the annular groove in the connecting side cylinder of the male body so that the elastic O-ring is in close contact with the female body and the gasket has an annular shape. Since the edge on one side of the groove and the edge of the step on the female body are bited in, the joint can be sealed tightly and leakage of internal fluid can be reliably prevented, and the edge of the step is bited into the gasket. Is performed by the repulsive force of the coil spring, so the lock sleeve does not require a large tightening torque, and work is easy and no special tools are required. To.

[Brief description of drawings]

FIG. 1 is a half sectional side view of the present invention when a female joint and a male joint are separated. FIG. 2 is a perspective view of a lock sleeve. FIG. 3 is a side view of a half section when the joint is connected. FIG. 4 is an enlarged view of the circular portion of FIG. FIG. 5 is a side view of a half section of a conventional joint at the time of connection. In the figure, A ... Female joint, 1 ... Female body, 1a ... Intermediate step, 1b ... Outer step, 1c ... Annular groove, 2 ... Tube body, 3 ... Lock sleeve 3b ... Spiral notch, 3b ₁ ... Inlet Part, 3b ₂ ... Intermediate spiral part, 3b ₃ ... Reverse direction spiral end part 4 ... Sliding valve, 5 ... Fixed valve body, B ... Male joint, 11 ... Male main body, 11a ... Inward projection, 11b ... Coupling side Cylindrical portion, 11c ... Tapered surface, 11d ... Annular groove 12 ... Tube body, 13 ... Movable valve body 7, 14 ... Retainer, 16 ... Gasket, 17 ... Elastic O-ring, 6, 15, 19 ... Coil spring.

Claims (1)

[Scope of utility model registration request] 1. A female body 1 in which a sliding valve 4 is fitted inside by a spring biasing to a coupling side and a mushroom-shaped fixed valve body 5 is provided.
The step portion 1a and the annular groove 1c having an edge 1e on the outer peripheral center portion of the provided on the outside of the female body 1, the inlet portion 3b ₁ of the coupling end through the annular groove 1c and the intermediate spiral portion 3b ₂ and a plurality of spiral notches 3 made of reverse helical end 3b ₃
A female joint A having a lock sleeve 3 rotatably attached thereto and a movable body 13 having a mushroom-shaped movable valve body 13 inside, which is spring-biased toward the coupling side, is movable to the center inside the male body 11. Disc 13
Is provided with an inward projection 11a having a tapered surface 11c with which
An annular groove 11d is formed in the center of the inner surface of the cylindrical portion 11b on the coupling side of the inward projection 11a, and an elastic O-ring 17 for sealing the female body and a gasket 16 made of synthetic resin are provided in the annular groove 11d as a coil spring. The male body 1 is arranged by urging it toward the coupling side by 19
A self-sealing type pipe joint consisting of a male joint B in which a plurality of lock pins 20 corresponding to the notches 3b are planted on the central portion of 1.