JPH083825Y2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention cuts off the fluid supply to the inside of the pipe joint before separating the connected socket and plug, and immediately after that, the inside of the pipe joint is disconnected. The present invention relates to a pipe joint in which the pressure of the residual fluid is removed, and the socket and the plug can be separated safely and easily without causing discomfort.

[Prior Art] For example, when piping between a fluid supply source and a fluid consumption source using a hose or a hard pipe, various pipe joints including sockets and plugs that are easily separated from each other have been conventionally used. The spent fluid consumption source is typically separated from the fluid supply source. However, in this case, before separating the socket and the plug, it is necessary to close the valve provided in the pipe connecting the fluid supply source or to stop the fluid supply source.

Moreover, since the pressurized fluid remains in the pipe, the fluid in the pipe on the fluid consumption source side spurts out vigorously when the socket and plug are separated. It was very uncomfortable and dangerous, as he bounced around.

[Problems to be Solved by the Invention] In view of the above-mentioned problems in the conventional fluid piping, the present invention provides a fluid supply source side with one operation when the socket and the plug are separated. Block the fluid passage of
Subsequently, it is intended to solve the problem that the residual fluid on the side of the fluid consumption source can be discharged, thereby eliminating the trouble and discomfort at the time of separation and enabling the socket and the plug to be separated without danger. At the same time, the operation of separating the socket and the plug should be made impossible until the fluid passage is completely closed and the residual fluid is completely discharged, so that there is a risk of careless separation of the socket and the plug. The problem to be solved is to prevent it.

[Means for Solving the Problems] The present invention provides a first means for solving the above problems.
The idea is to press the lock ball that moves forward and locks the plug at the tip of the socket, retreat to release the presser foot, and when the socket and plug are not connected, they are held in the retracted position and advance when connected. Equipped with a sleeve
Further, a step portion is provided at the rear portion of the fluid passage that penetrates the socket main cylinder, the rear portion has a slightly smaller diameter through the step portion, and the rear portion has a valve head facing the small diameter fluid passage,
A cylindrical valve body having a through hole that communicates the inner and outer circumferences with a rear side peripheral wall is fitted slidably in the axial direction, and the end face of the plug is sealed in the front opening of the valve body. A sliding cylinder having a seal ring and an axially penetrating fluid passage is fitted so as to be slidable in the axial direction, and the valve head of the valve body is provided on a sliding contact surface portion between the valve body and the sliding cylinder. Is provided with a locking portion that engages with each other after the portion has entered the small-diameter fluid passage, and a compression coil spring that relatively presses both is provided between the valve body and the sliding cylinder. An operating cylinder is loosely fitted to the outer peripheral surface of the socket main cylinder, and a pin is provided through which the operating cylinder and the valve body are movably passed through an elongated guide hole formed in the socket main cylinder. Via an axially movable unit, and when the operating cylinder is in the forward and backward positions, move the operating cylinder forward to the forward position. The valve head of the valve body to move forward together to try to free fluid passage disengaged from the small diameter fluid passage time,
Moreover, when the sliding cylinder fitted to the valve body is pressed against the connected plug and prevents the backward movement of the sleeve that is advancing when the plug is connected, and when the operating cylinder is retracted to the retracted position, The valve head of the valve body that retracts as a unit closes the small-diameter fluid passage, and the sliding cylinder fitted to the valve body also retracts and separates from the connected plug, and separates the plug from this state. The operation cylinder is set to a position where the forward movement of the operation cylinder is blocked by the sleeve that moves backward when the operation cylinder is further inserted, and the operation cylinder is set by locking the pin in the elongated guide hole formed in the socket main cylinder body. We adopted a configuration that has locking parts that fix it in the forward and backward positions.

The second invention adopts a structure in which a fluid discharge hole is formed in the socket main cylinder body between the lock ball and the valve body.

[Operation] When the operation cylinder fitted to the outer periphery of the socket main cylinder is moved rearward, the valve body connected to the operation cylinder via the pin also moves rearward, and the valve head is moved to the socket main cylinder body. The rear small diameter fluid passage is airtightly fitted to close the fluid passage of the socket main cylinder, and after the fluid passage is closed in this way, the valve body continues to move rearward, The sliding cylinder locked to the valve body moves rearward along with the valve body, and the position of the seal ring retracts.

Further, when the operating cylinder is moved forward, the valve body moves forward together with the sliding cylinder, and the sliding cylinder equipped with the seal ring on the front side before the valve head separates from the rear small-diameter fluid passage. The seal ring reaches the most advanced position immediately before the valve head moves forward and separates from the rear small-diameter fluid passage of the socket main cylinder, and the fluid passage of the socket main cylinder opens immediately after that.

When connecting the socket and the plug, the operating cylinder and the sleeve are both positioned in the retracted position, and the valve body closes the fluid passage of the socket main cylinder body, and then the plug is inserted into the socket and the sleeve is advanced. By doing so, the socket and the plug are locked by the lock ball to complete the connection. When the fluid flows through both the socket and the plug in the connected state, the operation tube is moved forward. At this time, before the valve body opens the fluid passage of the socket main cylinder body, as described above, the sliding cylinder having the seal ring on the front surface is moved forward to bring the seal ring into pressure contact with the end face portion of the plug, and the space between the socket and the plug is Seal. After the sealing between the socket and the plug is completed in this way, the valve body separates from the rear small-diameter fluid passage of the socket main cylinder, opens the fluid passage of the socket main cylinder, and completes the communication between the socket and the plug. .

In the connected state of the socket and the plug, the fluid flows from the socket side to the plug side. Then, when separating the socket and the plug, first, the operation tube fitted to the outer peripheral surface of the socket main cylinder is moved backward. At this time, the valve body that is retracted at the same time first closes the fluid passage of the socket main cylinder body because the valve head is airtightly fitted into the rear small diameter fluid passage of the socket main cylinder body, and the fluid supplied to the inside of the socket is closed. Cut off. When the valve element subsequently retreats, the sliding cylinder also begins to retreat, and the seal ring provided at the front of the valve body separates from the end surface of the plug, leaving the residual fluid on the plug side between the sliding cylinder and the plug. After that, it is discharged to the outside through the gap between the socket and the plug, and the residual pressure on the plug side disappears.

After retracting the operation tube, the sleeve is retracted to unlock the plug by the lock ball,
The socket and plug are separated. In the operation tube and the sleeve, when the sleeve is in the retracted position, the operation tube is prevented from moving forward, and when the operation tube is in the advanced position, the sleeve is prevented from moving backward. Only after the connection of the plug and the plug is completed, the fluid passage can be opened, and after the fluid passage is closed, the socket and the plug can be separated.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the drawings, 1 is a socket and 2 is a plug connected to the socket 1.

Reference numeral 3 denotes a socket main cylindrical body which constitutes the socket 1, and 4 denotes a fluid passage which penetrates the socket main cylindrical body 3. The fluid passage 4 has a step portion 34 at its rear portion, and the step portion 34 is interposed therebetween. A fluid passage 6 having a slightly smaller diameter is formed at the rear portion, and a fluid passage 5 having a larger diameter is formed at the front portion.

Reference numeral 7 denotes a valve body that is slidably fitted in the large-diameter fluid passage 5 of the main socket 3 of the socket to open and close the fluid passage 4,
It has a valve head 8 facing the small-diameter fluid passage 6 at its rear part,
In addition, it has a cylindrical structure having a through hole 9 communicating with the inner and outer circumferences on the peripheral wall on the rear side. A seal ring 10 is provided on the outer peripheral surface of the valve head 8 to press against the inner peripheral wall of the small diameter fluid passage 6 to seal it.

11 is a Y that seals between the socket main cylinder 3 and the valve body 7.
The seal ring has a V-shaped cross section and is provided on the outer peripheral surface of the valve body 7.

Reference numeral 12 is a sliding cylinder having a seal ring for sealing the end surface of the plug 2 at the front end surface and a fluid passage 35 penetrating in the axial direction. The sliding cylinder 12 is inside the front opening of the valve body 7. It is fitted in the airtight manner and slidably in the axial direction.

A seal ring 16 is provided on the outer peripheral surface of the sliding cylinder 12 and seals the outer peripheral surface of the valve body 7. The valve head 8 of the valve body 7 is provided on the sliding contact surface portion of each of the valve body 7 and the sliding cylinder 12 fitted to the valve body 7 by the rearward movement of the valve body 7. Locking portions 13 and 14 are provided which engage with each other after entering the inside. A compression coil spring 15 that presses the valve body 7 and the sliding cylinder 12 against each other is interposed between the valve body 7 and the sliding cylinder 12, and when the socket 1 and the plug 2 are not connected,
The sliding cylinder 12 is urged forward by the elastic force of the compression coil spring 15 so that the front portion thereof projects from the front opening of the valve body 7, and the locking portion 13, between the valve body 7 and the sliding cylinder 12, 14 engaged,
When the socket 1 and the plug 2 are connected, the sliding cylinder 12 is pushed by the tip of the plug 2 and retracts against the elastic force of the compression coil spring 15, and in this connected state, the valve body 7
Is moved rearward, the valve head 8 of the valve body 7 enters the small-diameter fluid passage 6, and then the locking portions 13 and 14 are engaged with each other, so that the sliding cylinder 12 and the valve body 7 also move. The rear end of the sliding cylinder 12 is configured to be separated from the tip of the plug 2 by moving backward.

Reference numeral 18 denotes a guide long hole formed by obliquely intersecting the axial center line of the socket main cylindrical body 3, and the long hole 18 is formed to have a length for setting the movement range of the valve body 7. At both ends of the hole 18, there are locking portions 20 and 21 extending in the circumferential direction for fixing the valve body 7 (FIG. 3).

 The elongated hole 18 may be parallel to the axis.

Reference numeral 22 denotes an operating cylinder fitted in the outer peripheral surface of the socket main cylindrical body 3 so as to be slidable in the axial direction. The operating cylinder 22 is connected to the valve body 7 by a pin 23 that moves along the elongated guide hole 18. The valve body 7 is connected so that when the operating cylinder 22 is rotated, the valve body 7 moves in the axial direction.

The guide long hole 1 that does not include the locking portions 20 and 21.
The length of 8 is not constant depending on the angle of intersection with the axis of the socket main cylinder 3, but the operating cylinder 22 and the valve body 7 are advanced to the foremost position when the socket 1 and the plug 2 are connected. At this time, the valve head portion 8 at the rear portion of the valve body 7 separates from the small diameter fluid passage 6 of the socket main cylinder body 3 to release the fluid passage 4, and the front end surface portion of the sliding cylinder 12 fitted to the valve body 7 Is pressed against the end surface of the plug 2 (FIG. 1), and when the operating cylinder 22 is retracted to the rearmost position, the valve body 7 is also retracted, and the valve head 8 of the valve body 7 of the socket main cylinder body 3 is By entering the small diameter fluid passage 6 to close the fluid passage 4 and then retreating the valve body 7, the locking portion
13, 14 are engaged with each other, the sliding cylinder 12 is also retracted as the valve body 7 is retracted, and the front end face portion thereof is set to a dimension (FIG. 2) away from the end face portion of the plug 2.

Next, the connection locking mechanism of the socket 1 and the plug 2 will be described.

The connection locking mechanism shown in the embodiment is no different from the conventional mechanism, and includes the lock ball 24, the tapered through hole 25 for housing the ball 24, and the sleeve for restraining and releasing the lock ball 24.
26, lock ball holding surface 27, etc. The tapered through holes 25 provided in the front portion of the socket main cylinder 3 have a radius on the centripetal side slightly smaller than the radius of the lock ball 24, and in the embodiment, four tapered through holes 25 are formed in a line in the circumferential direction. In this tapered through hole 25, one lock ball 24 is housed so as to be retractable with respect to the inner and outer peripheral surfaces of the single socket main cylinder 3.

The sleeve 26 is axially slidably fitted to the outer peripheral surface of the front portion of the main socket 3 of the socket, and the inner peripheral surface of the sleeve 26 is a lock for pressing the lock ball 24 toward the centering direction during forward movement. A ball pressing surface 27 is provided, and a lock ball releasing portion 28 that allows the lock ball 24 to move when retreating is provided in a front portion thereof.

Reference numeral 29 is a compression coil spring that biases the sleeve 26 forward.

Since the sleeve 26 is provided so as to slide in the front-rear direction on the same outer circumferential circle of the operating cylinder 22 and the socket main cylindrical body 3, when the operating cylinder 22 is in the forward position, the sleeve 26 operates. When the operation tube 22 is in the retracted position by pressing the lock ball 24 in the centripetal direction with the lock ball pressing surface 27 in the proximity position, the sleeve 26 can be retracted. The ball holding ring is released by the action of the compression coil spring 31 at this time.
The 30 can be moved forward to a position for supporting the lock ball 24.

32 is a fluid discharge hole formed between the valve body 7 and the tapered through hole 25 for accommodating the lock ball formed in the front portion of the main socket 3 of the socket, and the fluid remaining on the plug 2 side by the hole 32. Is released to allow the pressure to drop faster. Reference numeral 33 is a lock ball engaging groove formed on the outer peripheral surface of the plug 2 in the circumferential direction for locking the lock ball 24.

 Next, the operation of the above embodiment will be described.

When the operating cylinder 22 fitted to the outer circumference of the socket main cylinder 3 is moved rearward, the valve body 7 connected to the operating cylinder 22 via the pin 23 also moves rearward so that the valve head 8 moves toward the socket main body. The rear small-diameter fluid passage 6 of the cylindrical body 3 is airtightly fitted to close the fluid passage 4 of the socket main cylindrical body 3, and thus the fluid passage 4 is formed.
After the valve is closed, the sliding cylinder 12 fitted to the valve body 7 is engaged with the locking portions 13,1 as the valve body 7 continues to move backward.
By the valve 4, the valve body 7 moves backward and the seal ring 17 provided on the front surface of the sliding cylinder 12 moves backward.

Further, when the operating cylinder 22 is moved forward, the valve body 7 moves forward together with the sliding cylinder 12, and the seal ring 17 is moved to the front portion before the valve head 8 is separated from the small diameter fluid passage 6. Immediately before the sliding cylinder 12 provided advances and the valve head 8 separates from the small-diameter fluid passage 6 of the socket main cylinder 3, the seal ring 17 reaches the most advanced position, and immediately after that, the seal ring 17 of the socket main cylinder 3 moves. The fluid passage 4 opens.

When connecting the socket 1 and plug 2,
22 is moved backward, and the valve body 7 closes the fluid passage 4 of the socket main cylinder 3 as described above. Thereafter, the sleeve 26, which has been released from the backward movement inhibition, is moved rearward by the operation cylinder 22 which is already in the retracted position, and the lock ball releasing portion 28 of the sleeve 26 is positioned above the lock ball 24.
At this time, the lock ball 24 is pushed out in the centrifugal direction by the forward movement of the lock ball pressing ring 30 urged by the compression coil spring 31, and the plug 2 can be inserted.

When the plug 2 is inserted into the socket main barrel 3 in this state, the lock ball holding ring 30 is
Is pushed rearward and the pushing force of the lock ball 24 in the centrifugal direction is released. When the plug 2 is further inserted, when the lock ball engaging groove 33 formed on the outer peripheral surface of the plug 2 reaches the centering position of the lock ball 24, the lock ball 24 is biased forward by the compression coil spring 29. The sleeve 26 is pushed in the centripetal direction and engages with the lock ball engaging groove 33 of the plug 2, and the lock ball pressing surface 27 formed on the inner peripheral surface of the sleeve 26 pushes the lock ball 24 in the centripetal direction. After that, the lock ball 24 is prevented from coming out of the lock ball engaging groove 33, and the connection between the socket 1 and the plug 2 is completed here.

After connecting the socket 1 and the plug 2 in this way, the operation tube 22 is rotated, the pin 23 is moved forward along the guide portion 19 of the elongated guide hole 18, and the operation tube 22 is connected by the pin 23. The valve element 7 being moved forward is also advanced, and when the valve element 7 and the operating cylinder 22 reach the foremost position, the pin 23 is locked to the locking portion 20 formed at the front portion of the guide portion 19. As a result, the sliding cylinder 12 that fits in the valve body 7 and is biased by the compression coil spring 15 to project its front portion from the front opening of the valve body 7 follows the valve body 7 and moves forward. However, as the valve body 7 advances, the sliding cylinder 12 has a seal ring 17 provided on its front end surface.
Comes into contact with the tip of the plug 2 connected to the socket 1 to prevent further movement. Here, the sealing between the socket 1 and the plug 2 is completed, but when the valve body 7 is further advanced, the valve head portion 8 of the valve body 7 causes the socket main cylinder body 3 to move.
From the small-diameter fluid passage 6 to open the fluid passage 4 of the socket main cylinder body 3, and eventually the fluid of the plug 2 having no valve body through the through hole 9 of the valve body 7 and the fluid passage 35 of the sliding cylinder 12. It communicates with a passage (not shown).

In the connected state of the socket 1 and the plug 2, the sleeve 26 is prevented from retreating by the operation tube 22 that has moved forward, so the socket 1 and the plug 2 cannot be separated unless the operation tube 22 is artificially retracted.

Pressurized fluid flows when connecting the socket 1 and the plug 2,
After that, when separating the two, the operating cylinder 22 is rotated in the opposite direction to retract the operating cylinder 22, and the valve body 7 is integrally retracted via the pin 23.

In the valve body 7 that retracts at the same time as the operation cylinder 22, the valve head 8 first enters the rear small-diameter fluid passage 6 of the socket main cylinder 3, and the seal ring 10 provided in the valve head 8 forms the inner peripheral wall of the small-diameter fluid passage 6. Is sealed to close the fluid passage 4 of the socket main barrel 3 to cut off the fluid supplied to the inside of the socket 1. When the valve body 7 subsequently retracts, the locking portions 20 and 21 are engaged with each other, and the sliding cylinder 12 also begins to retract with the valve body 7 retracting, and the seal ring 17 provided at the front portion thereof The plug 2 is separated from the end face portion, and the seal between the socket 1 and the plug 2 is released.

As a result, the residual fluid on the plug 2 side passes from between the tip of the sliding barrel 12 and the tip of the plug 2 through the gap between the socket main barrel 3 and the plug 2, and reaches the tip of the socket main barrel 3. It is gradually discharged to the outside through the gaps of the formed through hole 32, the lock ball 24 as the connection locking mechanism, the tapered through hole 25, and the like.

After the operation tube 22 is retracted, the sleeve 26 can be moved rearward, and the sleeve 26 is compressed by the compression coil spring 29.
When the lock ball 24 is retracted against the resilience force, the restraint force of the lock ball 24 is released and the socket 1 and the plug 2 can be separated.

When the socket 1 and the plug 2 are separated, the elastic force of the compression coil spring 31 moves the lock ball pressing ring 30 forward,
Supports the rock ball 24 from the centripetal direction. Thereafter, when the sleeve 26 is released, the lock ball 24 reaches the lock ball release portion 28 of the sleeve 26, and the movement of the sleeve 26 also stops.

[Advantages of the Invention] As described above, according to the present invention, when the socket and the plug are connected, the operating cylinder fitted to the outer circumference of the socket main cylinder is moved rearward so that the sliding cylinder for the valve seat can be moved. Since the tubular valve body can be operated via the socket, the fluid passage of the socket can be closed and the residual fluid on the plug side can be discharged to the outside while the socket and the plug are still connected. Therefore, according to the present invention, when the socket and the plug are separated from each other, the residual fluid is not rapidly discharged as before, no unpleasant sound is produced, and the plug bounces off from the socket in the process of being separated. Since there is no vigorous ejection of fluid from between the plugs, there is no danger and the socket and plug can be separated safely and easily.

Particularly, by forming a fluid discharge hole in the main socket of the socket between the lock ball and the valve body, it is possible to discharge the fluid through the hole in a short time and improve workability. Can be achieved. Further, in the operation tube and the sleeve, when the sleeve is in the retracted position, the operation tube is prevented from moving forward, and when the operation tube is in the advanced position, the sleeve is prevented from moving backward. , The fluid passage cannot be opened unless the connection between the socket and the plug is completed,
Moreover, since the socket and the plug can be separated only after the fluid passage is closed, it is possible to reliably prevent the fluid from accidentally flowing out, and there is an effect that the safety is extremely high.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a partially longitudinal side view showing a state in which a socket and a plug are connected and a fluid passage on the socket side is opened. FIG. 2 is a partially longitudinal side view showing a state of the inside of the socket when the operation cylinder is operated to release the residual fluid to the outside,
FIG. 3 is a partially omitted plan view of the socket main cylinder showing one mode of forming the long hole for the pin guide. 1 ... Socket, 2 ... Plug 3 ... Socket main cylinder, 4 ... Fluid passage 5 ... Large diameter fluid passage, 6 ... Small diameter fluid passage 7 ... Valve body, 8 ... Valve head, 9 ...... Through hole 10 …… Seal ring, 11 …… Seal ring 12 …… Sliding cylinder, 13,14 …… Slit portion 15 …… Compression coil spring 16,17 …… Seal ring 18 …… Slot for guide , 22 …… Operating tube 23 …… Pin, 24 …… Lock ball 25 …… Taper through hole, 26 …… Sleeve 27 …… Lock ball holding surface 28 …… Lock ball release part 29 …… Compression coil spring 33 …… Lock ball engagement groove

Claims (2)

[Scope of utility model registration request] 1. A tip of a socket presses a lock ball that advances and locks a plug, and retracts to release the presser,
In addition, when the socket and the plug are not connected, the sleeve is in a state of being held in the retracted position and is advanced at the time of connection. Through a fluid passage having a small diameter in the rear, and a valve head facing the small fluid passage in the rear,
A cylindrical valve body having a through hole that communicates the inner and outer circumferences with a rear side peripheral wall is fitted slidably in the axial direction, and the end face of the plug is sealed in the front opening of the valve body. A sliding cylinder having a seal ring and an axially penetrating fluid passage is fitted so as to be slidable in the axial direction, and the valve head of the valve body is provided on a sliding contact surface portion between the valve body and the sliding cylinder. Is provided with a locking portion that engages with each other after the portion has entered the small-diameter fluid passage, and a compression coil spring that relatively presses both is provided between the valve body and the sliding cylinder. Further, an operating cylinder is loosely fitted to the outer peripheral surface of the socket main cylinder, and a pin is movably inserted through a long guide hole formed in the socket main cylinder to insert the operating cylinder and the valve body. And movably connected together in the axial direction,
At the forward and backward positions of the operating cylinder, the valve head of the valve body that moves forward together when the operating cylinder is advanced to the forward position separates from the small diameter fluid passage to release the fluid passage, and When the sliding cylinder fitted to the body presses against the connected plug and prevents the sleeve from moving forward when connecting the plug, and when the operating cylinder is retracted to the retracted position, When the valve head of the valve body that retracts closes the small-diameter fluid passage, and the sliding cylinder fitted to the valve body also retracts and separates from the connected plug, and when the plug is separated from this state Is set to a position where the forward movement of the operating cylinder is blocked by the sleeve that moves backward, and the operating cylinder is set to the forward moving position by locking the pin in the long guide hole formed in the socket main cylindrical body. And a locking part for fixing to the retracted position is provided. The pipe joint. 2. The pipe joint according to claim 1, wherein the socket main cylinder has a fluid discharge hole formed between the lock ball and the valve body.