JPH0322624Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a pipe joint used for piping of equipment using pressure fluid, such as an air conditioner.

(Prior art) A seal ring made of hard metal and having a triangular cross section with sharp edges was used as a joint for air conditioner piping in order to improve the airtightness of the joint. It is widely known for issues such as No. 6114.

Its outline is as shown in Fig. 4 A and B, and the male member b has a large diameter rectangular collar 2 in the middle,
One side thereof forms a connecting cylinder part 1 for attaching, for example, an outflow side conduit _P2 , and the other side forms a connecting cylinder part 3 having a male thread 3d on the outer periphery, and the inside of the connecting cylinder part 3 has a fluid passage hole. 3a and the insertion hole 3b of the female side coupling cylinder part
An annular groove 3c having a larger diameter is formed at the connecting end of the insertion hole 3b, and a seal ring 4 as described above is fitted into the annular groove 3c.

On the other hand, the female member a similarly has a rectangular collar 6 in the middle, one side of which forms a connecting cylinder part 5, and the other side forms a connecting cylinder part 7 of the conduit _P1 on the inflow side, for example,
A union nut 8 having a female thread 8a that is screwed into the male thread 3d of the male member b is fitted onto the coupling cylinder part 5, and its base end is rotatably caulked into the annular groove on the front side of the collar 6. Also, the coupling cylinder part 5
An annular stepped portion 5a is provided on the central portion of the annular groove 3a so as to fit tightly into the annular groove 3a of the male end.

Then, screw the union nut 8 of the female member a into the female thread 3d on the coupling cylinder part 3 of the male member b as shown in FIG. By fitting, the sharp edge of the seal ring 4 is inserted into the end face of the annular step 5a on the female side coupling cylinder 5, thereby airtightly coupling the male and female members a and b.

(Problems to be solved by the invention) By the way, in the conventional pipe joint described above, when connecting and separating the female and male members a and b, the union nut 8 of the female member a is rotated many times with a tool such as a spanner. In a narrow place where equipment is crowded, such as the engine room of a vehicle, the number of times the tool is hung (changed hands) is increased, which may result in time-consuming work and insufficient connection.

Therefore, with this invention, it is possible to easily and quickly connect and separate the male and female members without taking much time.
Moreover, it is an object of the present invention to provide a pipe joint using a metal seal ring that does not cause poor connection.

(Means and effects for solving the problem) Based on the above object, this invention consists of a connecting cylinder part of the conduit, an intermediate cylinder part having a fluid passage hole, and a connecting cylinder part having a male member fitting hole. As a pipe joint consisting of a female member, a connecting cylinder part with an abutting part, and a male member consisting of a conduit connecting cylinder part, the boundary between the fluid passage hole and the insertion hole in the female member is made of hard metal and has a triangular cross section. A plurality of coupling balls are provided around the central part of the coupling cylinder part so as to be retractable, and a plurality of protrusions and recesses are provided alternately on the coupling side surface of the intermediate cylinder part. A lock nut is screwed together, and the coupling cylinder has alternating protrusions and recesses that are opposite to and removable from the protrusions and recesses of the lock nut. A sleeve having a tapered surface that widens toward the side is biased toward the coupling side by a spring, and an annular groove is provided in the center of the coupling cylinder portion of the male member, and the abutting portion of the male member is aligned with the edge of the seal ring. When brought into contact with the lock nut, the ball of the female member enters the annular groove shallowly, and the protrusion of the lock nut and the protrusion of the sleeve come into contact with each other.

Then, align the protrusion of the sleeve with the recess of the lock nut, move the sleeve forward, release the restraint on each ball, insert the coupling cylinder part of the male member into the coupling cylinder part of the female member, and insert the butt part into the coupling cylinder part of the male member. When the sleeve is brought into contact with the seal ring and the sleeve is released, the ball enters the annular groove on the male side shallowly in a biased state, and the sleeve stops with its tapered surface coming into contact with the ball.

In this state, if you match the protrusion of the sleeve with the protrusion of the lock nut and rotate the lock nut slightly,
Each ball fits deeper into the annular groove than originally, and the male and female members are hermetically coupled.

(Example) Figures 1 to 3 show an example of this invention. In Figure 1, A is a female member, the main body of which is one conduit P ₁ (for example, the inflow side).
A connecting cylinder part 11a on one side to which the connecting cylinder part is attached, a thick section cylinder part 11b whose outer periphery has a rectangular brim 11d and a fluid passage hole 12a on the inside, and this is stepped both inside and outside. It consists of a connecting cylinder part 11c on the other side that is thinner than the intermediate cylinder part 11b and has a fitting hole 12b for the male member B on the inside, and a boundary between the fluid passage hole 12a and the fitting hole 12b having a larger diameter. The part has a narrow annular groove 1 with an inner diameter between the two.
A seal ring 14 made of hard metal and having a triangular cross section with sharp edges on both sides is housed therein, and a coupling cylinder part 11c is provided.
A plurality of through holes 15a are formed in the center of the holder at predetermined intervals in the circumferential direction, and each of the connecting balls 15 is inserted upwardly with a portion thereof protruding inwardly. It is housed in a movable manner.

When these balls 15 are separated, they are prevented from flying out by an inner sliding surface 16a of a sleeve 16, which will be described later, and which is slidably fitted onto the coupling cylinder portion 11c.

On the other hand, a male thread 11e is provided at a position adjacent to the flange 11d on the outer periphery of the intermediate cylindrical portion 11b, and a polygonal lock nut 13 as shown on the left side of FIG. 2 is screwed into this male thread 11e via an inner female thread 13a. has been done.

The lock nut 13 consists of a polygonal main body and a short cylindrical part that protrudes to the connecting end side (right side in the figure).The lock nut 13 is equipped with the female thread 13a inside the polygonal main body, and has a protrusion of a certain arcuate width on the side surface of the cylindrical part. Part 13b and recess 1
3c are formed alternately, and one of the protrusions 13
A positioning stopper 13d extending toward the joint end is provided at one end of b.

The sleeve 16 fitted onto the coupling cylinder part 11c as described above has an arcuate width approximately equal to that of the protrusion 13b and the recess 13c of the lock nut 13 on the side surface facing the lock nut 13, so that they can be engaged with and detached from each other. Protrusions 16b and recesses 16c are formed alternately, and a step 1 is formed at one end of the inner sliding surface 16a.
6d, and the other side is provided with a tapered surface 16e that widens toward the joining end side, and the sleeve 16 has an inner step portion 16d and an intermediate cylindrical portion 11b.
It is biased toward the joint end side by a coil spring 17 disposed between the upper step part, and when the joint is separated, its end surface abuts against the stop ring 18 attached to the end of the joint cylinder part 11c. The head of each ball 15 is restrained by the inner sliding surface 16a.

On the other hand, the male member B is connected to the connecting cylinder part 21a and the connecting cylinder part 2 of the other conduit P ₂ (for example, the outflow side) which has a larger diameter than the connecting cylinder part 21a.
1b, a stepped abutting part 21c that can fit into the annular groove 12c in the female member A is formed at the tip of the coupling cylinder part 21a, and each ball 15 of the female member A is formed on the center part. An annular groove 22 that engages with the abutting portion 21 is bored.
When the end face of c simply contacts the free edge of the seal ring 14 in the female member A, each of the balls 15 on the female side enters shallowly in a biased state, and when the edge deeply bites into the end face, each ball 15 is made to go deeper than originally.

The lock nut 13 on the female member A and the arcuate protrusions 13b, 1 formed on the sleeve 16
6b have a length relationship such that when the end face of the abutting portion of the male member B comes into contact with the edge of the seal ring 14 in the female member A as described above, they approach or come into contact with each other.

When connecting the female and male members A and B based on the above structure, the lock nut 13 is butted against the collar 11d as shown in the figure in the separated state of FIG. When brought into contact with the stopper 13d of the lock nut 13, each protrusion 16b of the sleeve 16 will match the recess 13c of the lock nut 13, so the sleeve 16 is advanced while contracting the coil spring 17 and slides inward. The restraint on each ball 15 by the surface 16a is released, and in that state, the coupling cylinder part 11 of the female member A is
Insert the coupling cylinder part 21a of the male member B into the third
When the end face of the abutting portion 21c is brought into contact with the free edge of the seal ring 14 in the female member A and the sleeve 16 is made free as shown in Fig. While the sleeve 16 begins to be biased toward the groove 22, it retreats due to the restoring force of the coil spring 17, and the center portion of the inner tapered surface 16e abuts against the head of the ball 15 and stops.

At that time, each protrusion 16b of the sleeve 16 comes off from each recess 13c of the lock nut 13, and in this state, the sleeve 16 is rotated counterclockwise when viewed from the joint end side (right side) as shown in FIG. When the protrusion 16b different from the previous one is brought into contact with the stopper 13d as shown in FIG. If the lock nut 13 (its thread is a left-hand thread) is slightly rotated clockwise (approximately 45 degrees) when viewed from the joint end, the lock nut 13 will move slightly toward the joint end, and the sleeve will be inserted through the protrusions 13b and 16b. 16 is also moved back by the same amount in the same direction.

Due to the retreat, each ball 15, which is about to enter the annular groove 22 of the male member B, is moved to the inner tapered surface 1.
6e, and enters the groove 22 deeper than originally, as shown in Fig. 3 (c).
The falling action of the ball 15 draws the male member B inside.

Therefore, the edge of the seal ring 14 in the female member A is deeply wedged into the end face of the abutting portion 21c of the male member B, and both members A and B are airtightly coupled.

On the other hand, in the connected state shown in FIG. 3B, the lock nut 13 is rotated in the opposite direction to the previous one, and is moved back so that it comes into contact with the collar 11d again as shown in FIG. direction, and rotate one of the protrusions 16b into the lock nut 1.
When the sleeve 16 is moved forward to release the restraint on each ball 15 and the male member B is pulled out, the female and male members A and B are separated as shown in Fig. 1. be done.

(Effects of the invention) As described above, in this invention, a seal ring made of hard metal is provided at the boundary between the fluid passage hole in the male member and the male member insertion hole as a pipe joint, while the seal ring is provided in the center of the coupling cylinder. A plurality of coupling balls are installed in the
A lock nut with a plurality of protrusions and recesses alternately provided on the side surface on the joining side is screwed onto the intermediate cylinder part, and the lock nut faces the protrusions and recesses of the lock nut on the joining cylinder part and can be engaged with and detached from the lock nut. A sleeve is provided with alternating protrusions and recesses, and has a sliding surface on the inside and a tapered surface that widens from this toward the coupling side, and is biased toward the coupling side by a spring.
An annular groove is provided in the center of the coupling cylinder part of the male member,
When the butt part of the male member is brought into contact with the edge of the seal ring in the female joint, the ball of the female member will enter the annular groove of the male member shallowly, and the protrusion of the lock nut and the protrusion of the sleeve will come into contact with each other. So,
When connecting the female and male members, it is easy to bring the protrusion of the lock nut into contact with the protrusion of the sleeve.
By slightly rotating the lock nut while they are in contact, the edge of the seal ring can be inserted into the male side abutment part, allowing the female and male parts to be easily and airtightly joined. Since it is only necessary to reverse the number of times the female or male parts are rotated when connecting them, there is no need to rotate the female or male parts many times as in the past, making work easier and faster, and suitable for use in confined spaces. It is suitable.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional side view of an embodiment of this invention in a separated state. FIG. 2 is an exploded perspective view of the lock nut and sleeve. FIGS. 3A to 3C are half-sectional side views showing the operating state from the beginning of coupling of the female and male members to the completion of coupling. FIG. 4A is a half-sectional side view of a conventional pipe joint in a separated state. Figure B is a half-sectional view of the combined state. In the figure, A...female member, B...male member, 11a...
... Connecting cylinder part, 11b ... Intermediate cylinder part, 11c ... Connection cylinder part, 12a ... Fluid passage hole, 12b ... Fitting hole, 13 ... Lock nut, 13a ... Female thread,
13b... protrusion, 13c... recess, 14... seal ring, 15... ball, 16... sleeve,
16a...Sliding surface, 16b...Protrusion, 16c...
Recess, 16e...Tapered surface, 17...Coil spring, 21a...Connecting cylinder part, 21b...Connecting cylinder part,
21c...butt portion, 22...annular groove.

Claims (1)

[Scope of utility model registration request] A female member A consisting of a connecting cylinder part 11a of the conduit, an intermediate cylinder part 11b having a fluid passage hole 12a, a connecting cylinder part 11c having a male member fitting hole 12b, a connecting cylinder part 21a having an abutting part 21c, and a conduit. A seal ring 14 made of hard metal and having a triangular cross section is disposed at the boundary between the fluid passage hole 12a and the insertion hole 12b in the female member A. A plurality of coupling balls 15 are provided around the central portion of the portion 11c so as to be retractable, and a lock nut 13 having a plurality of protrusions 13b and recesses 13c alternately provided on the side surface on the coupling side is screwed onto the intermediate cylindrical portion 11b. Moreover, on the coupling cylinder part 11c, there are alternately protrusions 16b and recesses 16c that face and can be engaged with and detached from the protrusion 13b and recess 13c of the lock nut, and on the inside there is a sliding surface 16a and a recess 16c. A sleeve 16 having a tapered surface 16e that widens toward the coupling side is disposed with a spring bias toward the coupling side, and the coupling cylinder portion 21 of the male member B is
An annular groove 22 is provided in the center of a, and when the abutting portion 21c of the male member B is brought into contact with the edge of the seal ring 14, the ball 15 of the male member A enters the annular groove 22 shallowly and the lock nut is closed. A pipe joint characterized in that the protrusion 13b and the protrusion 16b of the sleeve can come into contact with each other.