JPH0235111Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a pipe joint used to connect an air conditioner and a test machine, for example, during a pressure test of an air conditioner. Simply push it into the connected pipe on the air conditioner side that has a threaded part.
This invention relates to a pipe joint in which the chuck part is automatically screwed onto and clamped onto the male thread part to enable one-touch connection.

(Prior art) When performing pressure resistance tests on air conditioning equipment, refrigeration equipment, refrigeration equipment, etc., pipe joints have traditionally been used to connect these equipment and test equipment. Although the diameter of the pipe body does not vary greatly depending on the manufacturer, due to differences in thread pitch, it is not possible to apply a particular pipe joint to the pipe body of all manufacturers.

Therefore, the applicant has already provided a chuck type pipe joint. The basic structure of this chuck-type pipe joint is that a plurality of notched recesses are formed at predetermined intervals at the tip of a cylindrical body provided in the main pipe of the joint, chucks are housed in each of the notched recesses, and the cylindrical body By manipulating the sleeve provided on the outer periphery of the chuck in the axial direction, the occlusal parts of all the chucks are expanded, and by simply pushing the male threaded part of the connected pipe into the expanded opening. The structure is such that the male screw part of the pipe to be connected and the pipe joint can be connected with one touch.

However, in this case, the width of the chucks is extremely wide, and each engagement part is provided with a female thread that screws into the male thread of the connected pipe, so the method of pushing the male thread is difficult. At worst, the female screw of the chuck and the male screw of the connected tube may become poorly screwed together, resulting in gas leakage during the pressure test.

(Problems that the invention aims to solve) In view of the fact that conventional pipe joints had male threads in the occlusal part of the chuck, which caused gas leakage and hindered pressure tests, we devised this invention. focuses on the above-mentioned chuck type pipe joint as a problem and attempts to solve this problem.

(Means for Solving the Problems) The present invention, as a means for solving the above problems, narrows the width of the occlusal part of the chuck, and creates a narrow notch recess for storing the narrow chuck. A wide guide wall is formed at the distal end of the body, and a wide guide wall is formed at the distal end of the cylindrical body between the respective notched recesses, and a connected pipe is formed in at least one engagement part of the narrow chuck. It adopts a structure that forms a female thread that screws into the male thread of the body.

(Function) The pipe joint of the present invention has a wide guide wall by widening the occlusal part of the chuck.
In addition, the guiding action of the guide wall is made to have some leeway, so that when the sleeve is pulled, the chuck automatically opens, and when pushing in the pipe to be connected, a reliable pushing position of the male thread part is obtained, and the chuck is and ensure complete threading of the male thread. On the other hand, the sliding tube is biased by the compression coil spring and is ready for insertion of the tube to be connected. In this way, when the pipe to be connected is ready to be inserted, insert the pipe to be connected into the insertion opening of the pipe to be connected, and press the seal ring on the end face of the sliding tube with the tip of the pipe. .
When the sleeve 13 is returned to its original position in this state, the chuck returns to its original state with the seal ring sealing the end surface of the tube, and the occlusal portion compresses the outer peripheral surface of the tube.

(Embodiment) The drawing shows an embodiment of the present invention, in which a hexagonal tightening portion 3 is formed at a suitable location on the outer circumference of a main joint pipe 1 having a communication hole 2 inside, and Forming a cylindrical portion 4 having a male screw portion 4a at its tip,
A female thread 5a provided at the rear end of the cylinder 5 is screwed and fixed to the male thread 4a of the cylinder 4 to form a main cylinder.

The cylindrical body 5 has a tapered hole 7 on the outer periphery of the front portion for individually loosely fitting a plurality of lock balls 6, and a flange portion formed at the tip portion has a cutout recess for individually housing a chuck 19, which will be described later. 8 are formed in three pieces at equal intervals at the tip, and a flange portion 5b is formed between each of the notch recesses 8, 8, 8,
The width of the notch recess 8 is significantly narrower than the width of the flange portion 5b.

A space 9 for storing the cylinder 5 and a compression coil spring is provided on the rear outer periphery of the cylinder 5, and a cover cylinder 1 is provided.
At the same time, a sleeve 13 is fitted on the front outer periphery of the cylinder 5 so as to be slidable in the axial direction with a sliding ring 11 interposed between the rear end of the sliding ring 11 and the cover cylinder. A compression coil spring 12 is installed between the rear wall portion 10a of the body 10.

The sleeve 13 has a rear end 13a inserted into the cover cylinder 10, and has a protrusion 13b at the center of its inner circumferential surface that engages with a protrusion 11a protruding from the outer circumferential surface of the sliding ring 11. Furthermore, a protrusion 13c is formed on the inner periphery of the tip portion to press a chuck 19, which will be described later, from the outer periphery. With the above-described structure, the sleeve 13 is able to compress the connected pipe 2 by the action of the compression coil spring 12 transmitted through the sliding ring 11.
It will always be biased in the direction of the insertion port S of No. 5.

Reference numeral 13d designates a finger hook protrusion protruding from the outer peripheral surface of the sleeve 13 in order to improve its operability. Cylindrical body 5
A ball support ring 15, which is biased toward the insertion port S by a compression coil spring 14, is fitted inside the ball support ring 15 so as to be slidable in the axial direction. The inside of the main cylinder consisting of the joint main pipe 1 and the cylinder body 5 has a seal ring 17 at the open end, and a sliding cylinder 16 fitted with an O-ring 24 in an outer circumferential groove is fitted so as to be slidable in the axial direction. At the same time, the sliding tube 16 is similarly urged in the direction of the insertion port S by the compression coil spring 18.

Reference numeral 16a denotes the sliding tube 1 whose outer circumferential surface is in surface contact with the inner circumferential surface of the cylinder body 5, and which is biased in the direction of the insertion port S by a compression coil spring 18.
This is a protrusion to prevent 6 from slipping out. Cylindrical body 5-3
The chuck 19 accommodated in each notch recess 8 is
The overall width including the occlusal part 22 formed at the tip is narrow, and the shape seen from the side is as shown in FIG. 1, for example. That is, it has a recess 19a near the rear that engages with the outer circumferential surface of the flange portion 21 of the cylinder 5 as a fulcrum P, and a recess 19a in which the coil spring ring 20 is fitted at the tip.
Also, the rear part has a tail part 19b that extends into the space 13e between the sleeve 13 and the sliding ring 11, and the tail part 19b faces the front end tapered surface 11b of the sliding ring 11 when the sleeve 13 moves forward. , when the sleeve 13 is retracted, the protrusion 1 on the inner circumference of the sleeve 13
Coil spring ring 2 receives the pressing force of 3c.
The occlusal part 2 is displaced in the centripetal direction against the elastic force of 0.
2 is opened.

The chuck 19 configured as described above has a second
As shown in the figure, it is arranged in notched recesses 8, 8, 8 formed at the tip of the cylindrical body 5, and is tightened in the centripetal direction by the coil spring ring 20 described above, so that no external force is applied to the sleeve 13. In the state (hereinafter referred to as the free state), all the chucks 19 maintain a state parallel to the axis X--X as shown in FIG. 1, making it easy for the connected tubes 25 to enter.

The connecting part 22 of the chuck 19 has a pipe body 2 to be connected.
A female screw 22a is formed to be screwed together with the male screw portion 26 of No. 5, and the female screw 22a is screwed into the male screw portion 26 of the connected pipe body 25. This female screw 22a does not have to be formed on the occlusal portions 22 of all the chucks 19, and may be formed only on the occlusal portion of one chuck 19, for example.

In addition, 23 in the figure is a stop ring that restricts the forward movement of the sleeve 13 in the direction of the push-in port S.

Next, the operation of this embodiment will be explained.

In the normal case where the male threaded portion 26 of the connected pipe body 25 is not connected to this pipe joint, Figs.
As shown in the figure, since the sleeve 13 is urged in the direction of the insertion port S by the elastic force of the compression coil spring 12, the engaging portion 22 of each chuck 19
is moving in the centripetal direction, and on the other hand, the sliding tube 16 is also moving in the direction of the insertion port S due to the elastic force of the spring 18.

In this state, as shown in FIG. 3, when the sleeve 13 is moved backward toward the joint main pipe 1 against the elastic force of the compression coil spring 12, the sliding ring is moved in conjunction with the backward movement of the sleeve 13. 11 moves in the same direction, and eventually the lock ball 6 in the tapered hole 7 of the cylindrical body 5 is pressed by the ball support ring 15 and protrudes outward. The lock ball 6 in this state is the sliding ring 1.
1, the sliding ring 11 is locked.

Therefore, in this state, even if the user releases the sleeve 13, the sleeve does not move back.

While retracting the sleeve 13 as described above, the pressing surface portion 13 formed on the inner circumferential surface of the sleeve 13
c presses the tapered surface portion 19b formed on the outer peripheral surface of each chuck 19 in the centripetal direction, so that the occlusal portion 22 of each chuck 19 moves in the opposite direction in the centrifugal direction, expanding the occlusal portion 22 of the chuck 19, The male screw portion 26 of the connected tube body 25 is made ready to be inserted into the insertion port S.

Therefore, when the male threaded portion 26 of the tube body 25 is inserted into the insertion port S, the male threaded portion 26 enters the insertion port S in close contact with the seal cylinder 17 provided at the tip of the sliding tube 16. .

At this time, the sliding tube 16 retreats against the spring 18, so that the locking portion 16 protruding from the outer peripheral surface
The ball support ring 15 is moved backward against the elastic force of the compression coil spring 14 by the pressing force a. Next, when the lock ball 6 provided in the tapered hole 7 of the cylindrical body 5 comes to face the small diameter outer circumferential portion 15a of the ball support ring 15, the lock ball can move in the centripetal direction of the cylindrical body 5. , sliding ring 11
becomes free and the compression coil spring 12
Since the lock ball 6 is pressed in the direction of the insertion port S by the elastic force, the inner peripheral surface of the ring presses the lock ball 6 in the centripetal direction, resulting in the state shown in FIG.

Under the elastic force of the compression coil spring 12,
The sliding ring 11 that has slid in the direction of the insertion port S advances the sleeve 13 in the same direction (backward movement) during the above-mentioned movement process, and presses the pressing surface portion 13c formed on the inner circumferential surface of the sleeve 13 into each chuck 19. Tapered portion 19b of
away from. The free ends of the three chucks 19 provided at the tip of the cylindrical body 5 are tightened in the centripetal direction by a spring band 20, so that the chucks 19
The engagement portion 22 of 9 is the male screw portion 2 of the connected pipe body 25.
6 from three sides and at least 1 chuck 1
The female thread 22 formed in the occlusal part of 9 is the male thread part 2.
6, the connected pipe body 25 and this pipe joint are reliably connected.

When separating the pipe body 25 to be connected and this pipe joint, the sleeve 13 is retracted by making a hole under the elastic force of the compression coil spring 12, as was done when connecting the pipe body 25 to be connected. , the occlusal portion of each chuck 19 may be widened.

In the above embodiment, three chucks 19 are provided so that all the chucks can be slid, but four or more chucks may be provided as necessary. Alternatively, instead of forming the male thread part 22 on the chuck 19, a rubber layer is provided on the occlusal part, and the rubber layer can be used as an occlusion part in place of the female thread part 22. may be fixed.

(Effects of the invention) The pipe joint of the present invention has a chuck whose occlusal portion is formed relatively narrow in width, a cutout recess for accommodating the chuck is formed at the distal end of the cylinder, and at least one of the chucks is One piece is supported so as to be slidable in the centrifugal direction, and a female screw or a rubber layer is formed on the occlusal part to engage with the male thread of the pipe to be connected, so the tip of the pipe to be connected is If the male threaded part is pushed in along the axis, the male threaded part will surely be in a chuck state with the end face completely sealed.
Moreover, the occlusal part is completely threaded and in close contact with the male screw part, ensuring a reliable connection. Furthermore, since the width of the engaging portion of the chuck is formed to be relatively narrow as described above, even if there is a difference in the pitch of the male screw portion of the connected tube, there is no problem in the connection state.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the pipe joint according to the present invention, Fig. 2 is a sectional view showing the chuck in an expanded state, and Fig. 3 is a state in which the male thread of the connected pipe body is connected. FIG. 4 is a sectional view showing the chuck, and FIG. 4 is a front view showing the chuck. DESCRIPTION OF SYMBOLS 1... Joint main pipe, 5... Cylindrical body, 13... Sleeve, 19... Chack, 22... Female screw, 25...
...Connected pipe body, 26...Male thread part.

Claims (1)

[Scope of utility model registration request] At least three chucks are provided at the tip of a cylindrical body fixed to the main joint pipe, and the occlusal part of each chuck can be expanded by movement of a sleeve fitted around the outer periphery of the cylindrical body. , the width of the occlusal portion of each of the chucks is formed to be relatively narrow, and a notched recess for accommodating the chuck is formed at the tip of the cylinder body, and at least one of the chucks is slidable in a centrifugal direction. In addition to supporting the occlusal area,
A pipe joint that has a female thread or a rubber layer that screws into the male thread of the pipe to be connected.