JPH0633280Y2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pipe joint, and more particularly to a pipe joint which can be applied to a high-pressure fluid pipe which can be easily repeatedly attached and detached.

[Prior Art] It is a necessary condition for pipe joints that connect fluid pipes to prevent fluid leakage during use. However, when flowing high-pressure fluid or dangerous fluid, fluid leakage does not occur even after attachment or detachment. It is natural that the condition that it does not occur must be met. As a pipe joint satisfying this condition, for example, the pipe joint shown in FIG. 3 can be cited. The pipe joint which has been conventionally used has compression springs 3 and 4 in the fluid passages of the socket 1 and the plug 2, respectively. Energized valve bodies 5 and 6 are provided so that when the socket 1 and the plug 2 are connected, the valve bodies 5 and 6 are pushed against each other to open, and the connection is completely completed by the valve bodies 5 and 6. Up to just before the socket 1 and the plug 2 in the connected state are completely separated from each other.

[Problems to be Solved by the Invention] In the above-described conventional pipe joint, since the compression springs 3 and 4 for urging the valve bodies 5 and 6 have large spring constants, the socket 1 and the plug 2 are A large force is required to connect the valve, and not only can the valve elements 5 and 6 be opened with a small force, but even if there is residual pressure, the connection cannot be made.
A method of using air pressure when detaching the socket 1 and the plug 2 has been adopted. However, when the socket 1 and the plug 2 are repeatedly attached and detached, not only the compression springs 3 and 4 but also
There has been a problem that the connection cannot be easily made due to the large elastic action of the compression springs provided at various locations.

[Means for Solving the Problems] As a means for solving the above problems, a pipe joint according to the present invention is provided with an inner cylinder inside a socket main cylinder, and a front part is provided between the socket main cylinder and the inner cylinder. A first sleeve biased rearward by a compression spring in a position, and a second sleeve biased forward by a compression spring in a rearward position thereof in an airtight manner so as to be movable in the cylinder axis direction; , A space surrounded by the inner cylinder and the first and second sleeves forms an introduction chamber into which pressurized air for moving the first and second sleeves is introduced,
Further, the inside of the inner cylinder is provided with the fluid passage and a valve element biased by a compression spring so as to come into contact with the valve seat located on the front side,
A sliding cylinder that is constantly urged rearward by a compression spring and moves forward when a pressurized fluid is introduced is provided on the inner cylinder with the above-mentioned lock element at the front and another lock element at the rear. A pressing surface portion projecting from the inner peripheral surface portion of the first sleeve is provided so as to oppose the locking element at the front of the cylinder, and a pressing surface portion protruding from the inner peripheral surface portion of the second sleeve is pressed against the locking element at the rear of the inner cylinder. The sliding cylinder is provided with a surface portion, and the lock bar at the rear of the inner cylinder pressed against the pressing surface portion by the forward movement of the sliding cylinder due to the introduction of the pressurized fluid engages with the locking groove provided on the outer peripheral surface portion of the sliding cylinder. Is locked in the forward position, and at that time the valve body in the sliding cylinder and the valve body in the plug connected to the socket are pushed against each other against the elastic force of the compression spring and opened. is there.

[Operation] In the pipe joint of the present invention, pressurized air is used when attaching and detaching the socket and the plug, and when connecting the socket and the plug, the pressurized air is introduced into the air introduction port of the socket. The first sleeve is slid against the urging force of the compression spring by air pressure, and the pressing force in the centripetal direction against the lock by the pressing portion provided on the inner peripheral surface of the first sleeve is released, and the plug insertion port of the socket is released. Insert the plug after easy insertion into.

At this time, on the other hand, the second sleeve is retracted by the air pressure,
The retracted position is maintained by the lock provided on the inner cylinder. Therefore, when the supply of the pressurized air is stopped, the first sleeve returns to the original position by the elastic force of the compression spring, and the pressing portion of the first sleeve presses the lock element in the centripetal direction, and the lock element is moved. The socket and the plug are completely connected by engaging with the locking groove of the plug. Next, when the pressurized fluid is flowed from the socket side toward the plug side, the fluid pressure acts on the inside of the sliding cylinder and the cylinder is directed toward the plug side because the valve body is initially closed in the socket. First, the outer peripheral surface of the plug is sealed with an O-ring provided on the inner peripheral surface of the same cylinder, and the valve element on the socket side and the valve element on the plug side abut against each other and press them against each other to make them relatively. Retreat to open fluid passage. At this time, the locking groove provided on the outer peripheral surface of the sliding cylinder moves to the position of the second locking element to release the pressing force of the locking element in the centripetal direction, and at the same time, the second sleeve causes the elastic force of the spring. The second locking element is pressed against the locking groove by the pressing surface portion provided on the inner peripheral surface portion of the sleeve to hold the sliding cylinder at the forward position (the fluid passage is open).

Next, when the socket and the plug are separated, the supply of the pressurized fluid flowing between them is first stopped, and the pressurized fluid does not act on the valve body and the sliding cylinder, and is applied from the air inlet of the socket. Supply compressed air. This pressurized air, on the one hand, moves the first sleeve against the elastic force of the spring and releases the first lock, while at the same time moves the second sleeve against the elastic force of the spring. And release the second lock,
The sliding cylinder pushes the locking element outward from the locking groove by the elastic force of the spring and retracts to relatively move the valve elements of both the socket and the plug forward to close the fluid passage. Then, it becomes separable. Second, second
The sleeve is held in the retracted position by the second lock.

[Embodiment] FIG. 1 and FIG. 2 are side views showing the cutting of a double-sided open / close type pipe joint according to an embodiment of the present invention.

Socket 1 and plug 2 shown in FIG. 1 separated from each other
Is a pair, and the socket 1 has an outer cylindrical body 8 whose main cylindrical body has a plug insertion port 7 into which the plug 2 is inserted in the front portion.
And an adapter 10 which is screwed into the rear portion of the outer cylindrical body 8 and is formed by penetrating the fluid introducing port 9, and the outer cylindrical body 8 is formed with an air introducing port 11 penetrating in the centripetal direction. ing. Further, the socket 1 is provided with a required annular space 50 between itself and the outer cylindrical body 8, and is provided with the inner cylinder 13 in a concentric state inside, and the inner cylinder 13 has the outer cylindrical body 8 and the adapter 10 substantially in the center thereof. Has a flange 12 fixed by, and both ends thereof extend to the vicinity of the plug insertion port 7 and the fluid introduction port 9 of the adapter 10.

The inner cylinder 13 is provided with a stepped portion 13a at the front end opening to have a slightly smaller inner diameter, and the diameter thereof is formed to be substantially the same as the outer diameter of the main cylindrical body of the plug 2, and at least that portion has a circumferential direction at least. Three tapered holes 14 are formed so as to penetrate therethrough, and locking balls (hereinafter referred to as “locking elements”) 15 are fitted into the holes 14 so as to be rollable in the centrifugal direction. Further, a stepped portion 13b is provided by forming the outer diameter of the inner cylinder 13 toward the fluid inlet 9 to be slightly smaller, and a through hole 16 is formed in a portion adjacent to the stepped portion 13b. Another locking element 17 is rollably fitted like the locking element 15. An air guide hole 18 is formed through the flange 12 of the inner cylinder 13 in the axial direction. Even if the outer cylinder 8 and the inner cylinder 13 are partitioned by the flange 12, the annular space 50 has a front portion. The space 50a and the rear space 50b are communicated with each other, and the pressurized air introduced from the air introduction port 11 is supplied to the front space 50.
It is configured so as to be introduced into the rear space 50b from a through the air guide hole 18.

Front space 50 partitioned by flange 12 as described above
The a has a locking portion for engaging with the stepped portion 13a at the front part to have a slightly smaller inner diameter, and its diameter is formed to be approximately equal to the outer diameter of the small diameter front part of the inner cylinder 13 A first sleeve 19 provided with 21 is fitted so as to be slidable in the axial direction, and in the state shown in FIGS. 1 and 2, the pressing surface portion 21 presses the locking element 15 toward the centripetal direction to lock it. It prevents the child from rolling.

Further, the rear space 50b partitioned by the flange 12 has a step portion 13a and an engaging portion at the rear portion to make the inner diameter slightly smaller, and the diameter is almost the same as the outer diameter of the small-diameter step portion of the inner cylinder 13. The second sleeve 20 having the lock member pressing surface portion 25 formed in the same manner
Is slidably fitted in the axial direction, and in the state shown in FIG. 2, the pressing surface portion 25 presses the locking element 17 toward the centripetal direction, but in the state shown in FIG. Is a lock
The locking element is released away from 17, and the sliding cylinder 29 described later is free to move in the axial direction. In this manner, the annular space 50 provided inside the socket is partially surrounded by the outer cylinder body 8, the inner cylinder 13 and the first and second sleeves 19 and 20 that form the main socket cylinder body and is pressurized. It is formed as an air introduction chamber 50 '. The first sleeve 19 is integrally formed at the rear portion thereof with a piston portion 22 which is operated by the air pressure of the pressurized air introduced from the air introduction port 11 provided in the outer cylindrical body 8, and the outer periphery of the piston portion 22 is formed. A packing 23 that slides on the inner peripheral surface of the outer cylinder body 8 is fitted on the surface, and an O-ring 36d is fitted on the inner peripheral surface that slides on the outer peripheral surface of the inner cylinder 13. The first sleeve 19 has a compression spring 24 whose one end is locked to the outer cylindrical body 8.
Is urged toward the rear by the stepped portion 13c formed on the outer peripheral surface of the inner cylinder 13 and is positioned when the small diameter portion 19a of the first sleeve 19 is locked, and the pressing surface portion 21 at the tip is used to lock the lock. At the same time that 15 is restrained from the outside, the piston portion 22 formed integrally with the sleeve 19 is made to stand by at the most retracted position. The second portion facing the piston portion 22 of the first sleeve 19
At the front end of the sleeve 20, a piston portion 26 that operates by the pressure of the pressurized air introduced from the air introduction port 11 is integrally provided similarly to the former 22, and the piston portion 26 has an inner and outer peripheral surface O. The rings 27, 27 are individually sealed to prevent leakage of the pressurized air introduced together with the first sleeve 19. The second sleeve 20 is urged forward by a compression spring 28 having one end locked to the adapter 10. However, since the spring constant of the compression spring 28 is larger than that of the compression spring 34, the sleeve concerned. The locking force of the locking element 17 by 20 is large, and thus the force that regulates the sliding cylinder 29 is large, in other words, it prevents the valve body 5 from inadvertently closing the fluid passage. Inside the inner cylinder 13, a sliding cylinder 29 having a fluid passage 29a in the axial direction is arranged so as to be slidable in the axial direction of the inner cylinder 13. An O-ring 33 that seals the outer peripheral surface of the inserted plug 2 is provided on the front inner peripheral surface thereof, and an O-ring 36c that seals between the inner peripheral surface of the inner cylinder 13 and the rear outer peripheral surface thereof. . A locking groove 30 for locking the lock 17 for holding the sliding cylinder is provided on the outer peripheral surface of the rear part of the sliding cylinder 29, and a compression spring 34 interposed between the inner cylinder 13 and the sliding cylinder 29. The locking element 17 is positively locked in the locking groove 30 when the sliding cylinder 29 is slid forward against the lock. In addition, a valve body receiver 31 is provided at a substantially central portion of an inner peripheral surface of the sliding cylinder 29 which constitutes the fluid passage 29a.
And the valve seat 32 are provided with a space therebetween, and the valve body 5 axially slidably supported by the valve body receiver 31 is the compression spring 3
The O-ring 5a provided on the outer peripheral surface of the valve body 5 is pressed against the valve seat 32 by being urged toward the plug insertion port 7. The sliding cylinder 29 is biased toward the fluid inlet 9 side by the compression spring 34 as described above.
The stopper is held at the end of the adapter 10 on the fluid inlet 9 side.

On the other hand, the plug 2 has a fluid passage 41 at the axial center of the plug main cylinder 40.
And a valve body 6 identical to the valve body 5 is provided in the fluid passage 41.
Is slidably supported by a valve body receiver 44 similarly provided in the passage 41. The valve body 6 has a valve head 43 pressed by the valve body 5, and the valve head 43 is axially pressed by the valve body receiver 44 and the compression spring 4 and is provided at the open end of the plug main cylinder 40. The fluid passage 41 can be closed by being pressed against the valve seat 45.

Locking element that the socket 1 has on the outer peripheral surface of the plug main cylinder 40
The fact that the engagement groove 42 having an inverted trapezoidal cross section that engages with 15 is formed in the circumferential direction is no different from the previous one.

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

When connecting the socket 1 and the plug 2, first, pressurized air is introduced into the air introduction port 11 of the socket 1. The pressurized air introduced into the socket 1 acts against the elastic force of the compression spring 24 to press the piston portion 22 of the first sleeve 19 in the right direction in FIG. 1 and plug the first sleeve 19 into the plug. Since it is moved to the insertion port 7 side, the pressing surface portion 21 of the first sleeve 19 is the lock 15
When the lock element 15 is disengaged from the lock member 15 and is restrained by the first sleeve 19 in the hole 14 of the inner cylinder 13, the pressing force in the centripetal direction is released, and the lock element 15 becomes free. Therefore, when the tip portion of the plug 2 is inserted into the plug insertion opening 7 of the socket 1, the plug 2 enters the outer cylindrical body 8 without being obstructed by the locking element 15 and is eventually provided on the outer peripheral surface of the plug 2. The locking element 15 is engaged with the locking groove 42. Therefore, when the air supply to the air introduction port 11 of the socket 1 is cut off, the first sleeve 19 is returned to its original position by the elastic spring of the compression spring 24, and the pressing surface portion 21 of the first sleeve 19 is locked. 15 is pushed in the centripetal direction to engage with the circumferential groove 42 of the plug 2 so that the socket 1 and the plug 2 are completely connected. Note that, in this state, the fluid passage 29a of the socket 1 and the fluid passage 41 of the plug 2 are closed by the respective valve bodies 5 and 6, so that they are not in a communicating state.

Next, when a pressurized fluid is introduced from the fluid inlet 9 of the socket 1, the pressure of the pressurized fluid resists the elastic force of the compression spring 34 and pushes the sliding cylinder 29 to the right in FIG. The cylinder 29 is moved in the direction of the previously connected plug 2, and the outer peripheral surface of the plug 2 is sealed by the O-ring 33 provided on the inner peripheral surface of the sliding cylinder 29. With the movement of the sliding cylinder 29, the valve body 5 held by the sliding cylinder 29 also moves in the same direction, and the valve head of the valve body 5 presses the valve head of the valve body 6 of the plug 2. To do. At this time, a reaction force is generated in the valve bodies 6 and the valve bodies 5 and 6 press each other, and as a result, the valve bodies 5 and 6 are
Respectively retreat against the resilience of the compression springs 3 and 4, the sealing portion 5a of the valve body 5 is from the sealing surface 32a of the valve seat 32 of the sliding cylinder 29, and the valve head of the valve body 6 is a plug. The socket-side fluid passage 29a and the plug-side fluid passage 41 are in communication with each other apart from the valve seat 45 of the main body 40. Further, when the communication state is established in this way, the locking groove 30 of the sliding cylinder 29 and the lock member 17 of the inner cylinder 13 can be engaged with each other, and on the other hand, the lock member 17 is of the second sleeve 20. Since it is pressed in the centripetal direction by the pressing surface 25, the locking element 17 and the locking groove 30 of the sliding cylinder 29 engage with each other. At that time, the lock of the second sleeve 20 by the locking element 17 is released, the second sleeve 20 moves forward by the elastic force of the compression spring 28, and the pressing surface portion 25 of the second sleeve 20 causes the locking element 17 to form the hole 16 in the hole 16. The sliding cylinder 29 is retained inside and the engagement state with the locking groove 30 is maintained, and the sliding cylinder 29 is locked at the forward position by the locking element 17. Therefore, the fluid passage 29a of the socket 1 and the fluid passage 41 of the plug 2 maintain the communication state.

Next, a case where the socket 1 and the plug thus connected are separated will be described.

In this case as well, air is introduced into the air introduction port 11 of the socket 1, but before the two are separated, the socket 1 and the plug 2
Stop the fluid flowing between them. Socket 1 from air inlet 11
The pressure of the air introduced into the inside of the plug moves the first sleeve 19 to the plug insertion port 7 side as in the connection, and the pressing surface portion 21 of the first sleeve 19 presses the locking element 15 in the centripetal direction. To release. In this state, the socket 1 and the plug 2 can be separated, but the air introduced into the socket 1 passes through the air communication hole 18 and the piston portion of the second sleeve 20.
When the air pressure reaches 26 and the air pressure acts on the piston portion 26 of the second sleeve 20 against the resilience of the compression spring 24, the second sleeve 20 originally located in the right direction in FIG. It moves to the left in the figure against the elastic force of the compression spring 28 to the state shown in FIG. 1, the pressing surface portion 25 of the second sleeve 20 separates from the lock element 17, and the lock element becomes free. Therefore, the lock of the sliding cylinder 29 by the locking element 17 is released. Therefore,
The sliding cylinder 29 retracts by the elastic force of the compression spring 34 and returns to the original position shown in FIG. At this time, the compression spring 3 acting on the valve body 5 is restored and the valve body 5 closes the fluid passage 29a. Therefore, when the introduction of the pressurized air to the air introduction port 11 is cut off, the first sleeve 19 also returns to the original position by the action of the compression spring 24a on the one hand, and the elastic force of the compression spring 28 on the second sleeve 20 on the other hand. Comes to work. Accordingly, on the other hand, on the other hand, the locking element 17 which is in the free state as described above partially projects on the outer peripheral surface side of the inner cylinder 13, and the second sleeve 20 is urged by the elastic force of the compression spring 28. The second sleeve 20 is locked by being locked with the step portion 13b provided on the peripheral surface and moving the second sleeve 20 to the position shown in FIG. Therefore, even if the supply of air to the air inlet 11 is stopped, the second sleeve 20 remains locked in the original position, the sliding cylinder 29 also returns to the original position, and the socket 1
The operation of separating the plug 2 from the plug 2 is completed.

[Effect of the Invention] As described above, the present invention provides the inner cylinder inside the socket main cylinder body, and the first cylinder is urged backward by the compression spring at the front position between the socket main cylinder body and the inner cylinder. One sleeve is hermetically installed at a rear position of the second sleeve urged forward by a compression spring so as to be movable in the cylinder axis direction.
A space surrounded by the inner cylinder and the first and second sleeves forms an introduction chamber into which pressurized air for moving the first and second sleeves is introduced, and the inside of the inner cylinder has the fluid passage and the front side. A valve body that is biased by a compression spring so as to come into contact with the valve seat located at, and is provided with a sliding cylinder that is constantly biased backward by the compression spring and moves forward when the pressurized fluid is introduced. Is provided at the front thereof with another lock at the rear thereof, and a pressing surface portion projecting from the inner peripheral surface of the first sleeve is provided to face the lock at the front of the inner cylinder. A pressing surface portion protruding from the inner peripheral surface portion of the second sleeve is provided for the locking element at the rear of the inner cylinder, and the sliding cylinder by the introduction of pressurized fluid and the locking at the rear of the inner cylinder pressed by the pressing surface portion by the forward movement. The child engages with the locking groove provided on the outer peripheral surface of the sliding cylinder to move the sliding cylinder forward. Since it is locked in position, the valve body in the sliding cylinder and the valve body in the plug connected to the socket at that time are pushed against each other against the elastic force of the compression spring and opened. , When connecting the socket and the plug, if the pressurized air is introduced into the common air introducing chamber, the first sleeve moves to release the pressing force on the lock element in front of the inner cylinder to connect the plug to the socket. Further, when the socket and the plug are separated from each other, the first sleeve moves when the pressurized air is introduced into the common air introducing chamber to release the pressing force against the lock element in front of the inner cylinder. The plug is easily separated, and the second sleeve moves to release the lock of the sliding cylinder by the locking element behind the inner cylinder, and the sliding cylinder returns to its original position by the elastic force of the compression spring. The socket fluid passage is closed From the connection frequently, it is very effective as a pipe joint for repeating the separation. Moreover, by simply introducing pressurized fluid into the fluid passage after connecting the plug to the socket, the sliding cylinder moves forward to push open both valve elements of the socket and the plug, and the fluid passage communicates with each other. Since the sliding cylinder is maintained at the forward position by the locking element, it is not necessary to constantly press the sliding cylinder with the pressurized fluid, so the structure is simple and the operation procedure for connecting and disconnecting the socket and the plug is improved. Also has the effect of simplifying and contributing to miniaturization.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a side view of a socket and a plug separately shown, FIG. 2 is a side view of a socket and a plug, and FIG. 3 is a vertical section showing an example of a conventional double-way open / close type pipe joint. It is a side view. DESCRIPTION OF SYMBOLS 1 ... Socket, 2 ... Plug, 3 ... Compression spring, 4 ... Compression spring, 5 ... Valve body, 7 ... Plug insertion port, 8 ... Outer cylinder body, 9 ... Fluid inlet, 11 ... Air introduction port, 13 ... Inner cylinder , 14 ... Hole, 15 ... Locker, 16 ... Hole, 19 ... First sleeve, 20 ... Second sleeve, 21
... Pressing surface portion, 22 ... Piston portion, 24 ... Compression spring, 25 ... Pressing surface portion, 26 ... Piston portion, 28 ... Compression spring, 29 ... Sliding cylinder, 29
a ... fluid passage, 30 ... locking groove, 50 '... pressurized air introduction chamber.

Claims (1)

[Scope of utility model registration request] 1. A socket and a plug which are both biased by a compression spring and provided with a valve body for opening and closing a fluid passage. The socket has a lock element inside, and the plug has an outer peripheral surface portion for engaging the lock element. When the socket and the plug are connected by engaging the locking element and the locking groove with each other, the valve bodies provided in the socket and the plug respectively resist the resilient force of the compression spring. In a pipe joint of a type in which the socket main body is opened by pressing each other, an inner cylinder is provided inside the socket main cylinder, and a first spring is biased rearward by a compression spring at a front position between the socket main cylinder and the inner cylinder. A second sleeve, which is urged forward by a compression spring, is airtightly installed at a rear position of the sleeve so as to be movable in a cylinder axis direction, and is surrounded by a socket main cylinder, an inner cylinder, and first and second sleeves. The pressurized air that moves the first and second sleeves is introduced by the open space. Is provided with the fluid passage and the valve body biased by a compression spring so as to come into contact with the valve seat located on the front side. A sliding cylinder that is urged to move forward when the pressurized fluid is introduced is provided, and the inner cylinder is provided with the above-mentioned lock element in front of it and another lock element is provided behind it, with respect to the lock element in front of the inner cylinder. And a pressing surface portion projectingly provided on the inner peripheral surface portion of the first sleeve so as to face each other, and a pressing surface portion projectingly provided on the inner peripheral surface portion of the second sleeve is provided for the locking element at the rear of the inner cylinder. The locking element at the rear of the inner cylinder pressed by the forward movement of the sliding cylinder due to the introduction engages with the locking groove provided on the outer peripheral surface of the sliding cylinder to lock the sliding cylinder in the forward position, At that time, the valve element inside the sliding cylinder and the valve element inside the plug connected to the socket respectively spring the compression springs. Pipe joint being characterized in that so as to be opened each other pressing together against.