JPH0239111Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pipe joint used for connection to a Freon gas charging workpiece having a built-in valve core.

(Prior Art) A conventional workpiece (Freon gas charging valve) installed in a Freon gas cylinder is, for example, as shown in FIG. It's summery. This Freon gas charging valve 20 is provided with a male thread on the outer peripheral surface, and the Freon gas supply side pipe is screwed into this male screw, and during the screwing process, the valve is opened and the Freon gas is discharged. They had a method of injecting it.

(Problem to be solved by the invention) It is well known that pressurized Freon gas has an extremely low temperature and is therefore dangerous if it accidentally leaks during gas supply. However, when connecting a gas cylinder for gas supply, the valve opens during the screw-fitting of the Freon gas supply pipe as mentioned above, so the reality is that it is still exposed to danger, and this is considered a serious problem. Ta.

The present invention attempts to solve this problem by providing a pipe joint that allows workpieces to be attached with one touch.

(Means for Solving the Problems) Therefore, the present invention provides a sliding tube whose outer peripheral surface is sealed in the fluid passage of the main cylinder of the pipe joint so as to be slidable in the direction of the fluid passage. A locking ring for a locking ball provided on the main cylinder is provided so as to be slidable in the same direction as the sliding cylinder, and is clamped between the main cylinder and the main cylinder of the pipe joint, and locks with the sliding cylinder. A spring is used to bias the ring in the direction of connecting the workpiece, and a spring is applied to the outer periphery of the front end of the main cylinder of the pipe joint along the outer circumferential surface of the main cylinder in the same direction as the ring. A plurality of work chucks whose outer peripheries are held down by fitted sleeves are provided to be able to swing freely in a centrifugal direction, and the sliding tube further includes a ball holding part that pairs with the ring and presses the locking ball from the centripetal direction. , a seal ring is provided to seal the vicinity of the front part of the workpiece, and a workpiece operation ring having a pressing surface of an operation pin provided on the front part of the workpiece on the front part and having an internal and external communication hole for fluid is attached to the workpiece using a spring. The chuck is biased in the connection direction, and the inner surface of the chuck is provided with a female thread with a pitch that engages with the male thread provided on the outer circumferential surface of the workpiece, thereby solving the problem. It is something.

(Operation) The sleeve is pulled rearward, the plurality of chucks are swung in the centrifugal direction, and the female threads provided on the inner surface are opened and expanded. When a Freon gas charge valve (hereinafter referred to as the workpiece) is inserted, the front part of the workpiece pushes against the operating ring, and then seats against the seal ring provided on the front part of the sliding tube. At this time, the locking ball retaining ring and the workpiece operating ring are both pushed in together with the sliding tube, but since the spring that directly acts on the operating ring is weak, the operating ring does not push in the operating pin of the workpiece. When the sliding tube is pushed in together with the locking ball retaining ring against the stronger spring force, the centripetal upward force on the locking ball is eventually removed, so that the ball is pushed in front of the ring. The sleeve falls into the recess formed by the slope portion and the backward slope portion of the sliding tube, and the sleeve moves forward under the pressure of the spring, and the locking ball is restrained from the outer circumferential direction by the convex portion on the inner surface of the sleeve. As a result, the sliding tube and the locking ball retaining ring come to maintain their retracted positions, but on the other hand, the elastic force of the spring gradually becomes stronger, and eventually the front part of the operating ring engages the operating pin on the workpiece side. Press to open the valve. When the sleeve moves forward, the protrusion on the inner peripheral surface of the sleeve disengages from the protrusion on the rear end of the outer surface of the chuck and engages with the protrusion on the intermediate portion. Therefore, each female thread provided on the inner surface of the chuck becomes a virtual continuous female thread and completely engages with the male thread of the inserted workpiece, and the pipe joint and the workpiece are connected. be done.

To remove the workpieces connected in this way, move the sleeve backward against the spring, disengage the protrusion on the inner surface of the sleeve and the protrusion on the middle part of the chuck, and then press the protrusion on the rear end. engage. By this operation, the free end of the chuck moves in the centrifugal direction and disengages from the female threaded portion of the workpiece. At this time, the pressure on the locking ball by the protrusion of the sleeve is also released, so the ball is pushed out in the centrifugal direction by the biasing force of the locking ball retaining ring, and the workpiece is also pushed out by the biasing force of the sliding tube, allowing operation. The operating pin released from the ring returns to its original state and closes the valve.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a partially sectional side view showing the connection state with a workpiece 20, and Figure 2 being a partial side view showing the state in which the workpiece is separated. FIG. 3 is a cross-sectional side view.

In the figure, reference numeral 11 denotes a pipe joint main cylinder body with an adapter (rear part of the pipe joint main cylinder body) 1 screwed to the rear part, and a spring 12 is attached to the outer periphery of the pipe joint main cylinder body 11 through a sleeve rear part 13 in the forward direction. A sleeve 7 that is biased is fitted so as to be slidable in the axial direction, and the sleeve 7 and the rear part 13 are screwed together 13a. Further, on the inner circumferential surface of the sleeve rear part 13, a locking surface 13b that comes into contact with the stop ring 6 attached to the pipe joint main cylinder body 11 in the forward position is provided.
Then, the locking balls 14, which are movable in the centrifugal direction in the tapered holes 11b having a small diameter in the centripetal direction, which are provided at equal intervals in the pipe joint main cylinder 11, come into contact with the locking balls 14, and press the locking balls 14 in the centripetal direction. A protrusion 13c is provided at the rear end of the rear part 13 of the sleeve, and a slit 1 is provided at the rear end of the rear part 13 of the sleeve to engage with a sleeve locking ball 3 embedded in the pipe joint main cylinder 11 when retracting.
3d is provided.

16 is the male screw 2 of the workpiece 20 on the inner surface of the free end side.
A chuck having a female screw 16a that screws into the chuck 2,
On the outer surface of the chuck 16, protrusions 16b and 16c that engage with the protrusions 7a provided on the inner peripheral surface of the sleeve 7 are provided at the middle and rear ends. A plurality of chucks 16 are individually mounted in grooves 11c provided at equal intervals on the outer peripheral surface of the front end portion of the pipe joint main cylinder 11 so as to be freely swingable in the centrifugal direction.
Further, a convex portion 11a is provided on the front outer periphery of the pipe joint main cylinder 11 toward the centrifugal direction, and the chuck 16 is
A groove 16d is provided on the inner surface between the convex portions 16b and 16c provided on the intermediate and rear portions of the outer surface.
is engaged with the convex portion 11a and is swingably supported.

In addition, the outer circumferential surface of the fluid passage provided in the axial center of the pipe joint main cylinder 11 is sealed with an O-ring 2, and the sliding cylinder 10, which is biased by a spring 9 in the direction of inserting the workpiece, slides in the direction of the fluid passage. possible to be mated. Further, the front cylinder 19 of the sliding cylinder 10 has a workpiece 2
Seal ring 1 that seals the front part of the 0
5.

Reference numeral 5 designates a locking ball retaining ring which is slidably provided in the same direction as the sliding tube front tube 19 while being held between the pipe joint main cylinder 11 and the sliding tube 10;
A forward tapered portion 5 is biased forward by the elastic force of the spring 12 and supports the locking ball 14.
A rearwardly tapered portion 19a is formed on the outer circumferential surface of the front cylinder 19 of the sliding cylinder. Further, inside the front cylinder 19 of the sliding cylinder 10, there is an operating ring 17 which is biased in the front direction by a spring 18 which is weaker than the spring 9 and has a fluid passage 17a in the center. It is fitted to be slidable in the same direction as the sliding tube 10.

Note that the work 20 has a built-in valve core 21,
This is a known valve assembly for Freon gas charging, which has an operating pin 23 on the front surface for opening and closing the valve, which is the main part of the valve core 21, and a male thread 22 on the outer periphery.

Next, the operation when attaching and detaching the work 20 will be explained.

In FIG. 2, which shows the state in which the workpiece 20 has been removed, the sleeve 7 is retracted, and the protrusion 7a on the inner circumference abuts the protrusion 16c on the rear end of the outer surface of the chuck 16, and the chuck 16 is attached to the main pipe of the pipe joint. Convex portion 11 of body 11
The chucks 16 are swung around a as a fulcrum, and the chucks 16 are tilted in such a manner that the inner diameters of their tips are enlarged compared to the case shown in FIG.

In this state, from the right side of Fig. 2, workpiece 2
0 is inserted from the male screw 22 side, the seal ring 15 and the sliding tube front tube 19 are pushed in against the spring 9 through the sliding tube 10 with its tip, thereby locking against the spring 4. The ball locking ring 5 is also pushed in. In this state, the valve does not open, but when the workpiece 20 is further inserted, the operating pin 23 of the valve core 21 strongly pushes the operating ring 17 against the weak spring 18, so the elastic force of the spring 18 becomes stronger. The operation ring 17, which is strongly biased by the spring 18, presses the valve to open it.

When the locking ball retaining ring 5 is pushed in,
Since the upward force on the locking ball 14 from below is removed, the ball 14 is pushed into the tapered hole 11b of the pipe joint main cylinder body 11 by the urging force of the sleeve rear part 13 by the spring 12, so that the sleeve rear part 13 moves forward. Therefore, the locking ball 14 is pushed down by the protrusion 13c of the rear portion 13. At the same time, the sleeve 7 integrated with the rear part 13 is also
The chuck 16 moves forward to the position shown in the figure, and the protrusion 7a on the inner circumferential surface disengages from the protrusion 16c of the chuck 16 and engages with the protrusion 16b, moving the chuck 16 from the tilted state to the axis shown in FIG. By swinging in the parallel state, the female screw 16a engages with the male screw 22 of the workpiece 20, and the workpiece 20 cannot be pulled out. At the same time, lock ball 1
4 sinks into the recess formed by the tapered part 19a of the sliding cylinder front cylinder 19 and the ring front tapered part 5a, and the ball 14 is inserted into the sliding cylinder front cylinder 16, the locking ball locking ring 5 and Rear part 13 of sleeve 7
The sliding cylinder front cylinder 19 is sandwiched between the spring 4
The position is fixed while receiving the urging forces of and 9.

Next, in order to separate the connected workpieces 20,
When the sleeve 7 is moved backward against the spring 12, the protrusion 7a on the inner surface of the sleeve 7 moves, disengaging from the protrusion 16b of the chuck 16, and disengaging the protrusion 16c.
By engaging with the chuck 16, the chuck 16 tilts and expands outward using the convex portion 11a of the pipe joint main cylinder 11 as a fulcrum, and at the same time the engagement between the male thread 22 and the female thread 16a is released, and the sleeve Convex part 1 of rear part 13 of
3c releases the pressure on the locking ball 14, the locking ball locking ring 5 is pushed by the spring 4, pushing up the locking ball 14 as shown in FIG. 2, and moving the sliding cylinder front cylinder 19 forward. The workpiece 20 is pushed out by the front cylinder 19, and during this time the workpiece 20 is separated by closing the valve.

(Effect of the invention) The present invention provides a plurality of chucks that are swingable in the centrifugal direction, and has female threads that engage with male threads provided on the workpiece, and the chucks are operated by operating the sleeve, and At the time of coupling, the chuck is screwed into engagement with the chuck, and a valve built into the workpiece can be opened under a sealed state. Therefore, according to the present invention, it is possible to connect the workpiece with a single touch, and the opening and closing of the valve follows the attachment/detachment operation, making it extremely safe to operate and exhibiting excellent effects such as quick attachment/detachment operations. It is something.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the pipe joint of the present invention. Figure 1 is a partially sectional side view showing the state of connection with a workpiece, and Figure 2 is a partial side view when the workpiece is separated. Cross-sectional side view, FIG. 3 is a side cross-sectional view showing an example of a workpiece. Explanation of the main parts of the figure, 1... Adapter (pipe joint main cylinder), 5... Locking ball retaining ring, 6...
... Stop spring, 7 ... Sleeve, 9 ... Spring, 10 ... Sliding tube, 11 ... Pipe joint main cylinder, 12 ... Spring, 13 ... Rear part of sleeve (sleeve), 14 ... Locking ball, 15...
Seal ring, 16...Chuck, 16a...Female thread, 17...Operation ring, 18...Spring, 1
9...Sliding tube front tube (sliding tube), 19a...Tapered part (ball holding part), 20...Work, 21...
...Valve core, 22...Male thread, 23...Operation pin.

Claims (1)

[Scope of utility model registration request] A sliding cylinder whose outer peripheral surface is sealed is provided in the fluid passage of the main cylinder of the pipe fitting so as to be slidable in the direction of the fluid passage, and the main cylinder is sandwiched between the sliding cylinder and the main cylinder of the pipe fitting. A locking ring for a locking ball provided on the cylinder body is provided so as to be slidable in the same direction as the sliding tube, and the sliding tube and the locking ring are urged by a spring in the direction of connecting the workpiece, and the locking ball is attached to the tube. A plurality of workpiece chucks are attached to the outer periphery of the front end of the main cylinder body of the joint, and the outer periphery of the workpiece chucks is pressed down by a loosely fitted sleeve biased by a spring in the same direction as the ring along the outer peripheral surface of the main cylinder body. The sliding cylinder is further provided with a ball holding part that pairs with the ring and presses the locking ball from the centripetal direction, and a seal ring that seals the vicinity of the front part of the workpiece, A workpiece operation ring having a pressing surface of an operation pin provided on the front side of the workpiece and having an internal and external communication hole for fluid is provided with a spring biased in the direction of connecting the workpiece, and a workpiece operation ring is provided on the inner surface of the chuck. A pipe joint characterized by having a pitched female thread that engages with a male thread provided on the outer peripheral surface of a workpiece.