JPH08128580A - Pipe couping - Google Patents

Abstract

PURPOSE: To provide a pipe coupling which can prevent a spring from being corroded by fluid led to flow through a fluid passage, by inserting a valve guide body in a valve body so as to support the valve body in the shaft direction of a coupling main body, and arranging, inside the cylindrical body part of the valve body, a spring for applying spring force in such a direction that a clearance for a fluid flow is closed against the valve body. CONSTITUTION: A clearance 17 for a fluid flow between the inner circumferential surface of a coupling main body 11 and the outer circumferential surface of a cylindrical part 15, which is positioned at the tip of the cylindrical part 15 and brought in contact with the inner circumferential surface of the coupling main body 11 by the axial movement of the cylindrical part 15, is opened/closed by the valve part 16 of a valve body 14. A compression coil spring 22 is supported by the valve body part 16 of this valve body 14 and the end surface of the valve guide part 19 of a valve guide body 18 and the valve body 14 is moved in a valve closing direction by the compression coil spring 22 so that the valve body part 16 is brought in contact with a valve seat surface 12 formed in the inner circumferential part of the tip opening of the coupling main body 1. Hereby, a fluid flow part is positioned outside the valve body 14 and the compression coil spring 22 is provided inside the valve body 14, so that the valve body 14 can be prevented from being corroded without having any contact with fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint including a plug and a socket into which the plug is inserted and connected.

[0002]

2. Description of the Related Art A plug having a plug body and a valve provided inside the plug body and a tip portion of the plug body are removably inserted as a pipe joint for connecting hoses for flowing a liquid. Some sockets include a socket body having a plug receiving portion, a valve provided inside the socket body, and a socket provided with a lock mechanism held by the plug body inserted into the plug receiving portion of the socket body.

Conventionally, a valve provided in a plug and a socket in this pipe joint has a valve body which opens and closes a fluid passage formed inside the plug body and the socket body, and a spring in a passage closing direction with respect to the valve body. A spring to apply force,
There is a structure in which a spring receiver for receiving this spring is provided in the fluid passages of the plug body and the socket body.

In addition, the lock mechanism provided in the plug receiving portion of the socket body is provided with a ball movably arranged inward and outward in a hole formed in the wall of the socket body so as to penetrate inward and outward, and a socket of the socket body. A sleeve is provided outside the plug receiving portion that is movable in the axial direction and has a pushing portion that pushes toward the inside of the socket, and a spring that applies a spring force to the sleeve in the pushing direction of the ball. Is a type in which the pushing portion of the sleeve pushed by the spring pushes the ball, and the plug body is provided with a concave portion for locking the ball and a protruding portion located on the front side in the insertion direction with respect to the concave portion. ing.

In this locking mechanism, when the plug body is inserted into the plug receiving portion of the socket body, the protrusion of the plug body first pushes the ball toward the outside of the socket body to allow passage of the plug body, and then the plug body. The ball is locked in the recess and holds the plug body. When the plug body is pulled out from the socket body, the sleeve moves against the spring force in the direction in which the pushing part moves out of the ball to free the ball, and when the plug body is moved in the pulling direction, Becomes disengaged from the concave portion of the plug body, and the protrusion of the plug body pushes the ball to pull the plug body out of the socket body. In addition,
A pipe joint provided with such a valve and a lock mechanism is disclosed, for example, in Japanese Utility Model Laid-Open No. 62-97389.

[0006]

However, the valve provided in such a conventional pipe joint has the following problems.
The spring of the valve used for the pipe joint is made of a metal such as stainless steel in order to have excellent strength and spring properties. Further, in the conventional pipe joint, the spring of the valve is provided in the fluid passage of the plug body or the socket body so as to be directly exposed to the fluid flowing through the fluid passage. For this reason, in a pipe joint used for a pipe through which a corrosive fluid such as acid or alkali flows, the valve spring is directly exposed to the corrosive fluid flowing through the fluid passage. However, if a spring made of stainless steel is directly exposed to a corrosive fluid for a long period of time, the corrosion progresses and there is a problem in durability.

A pipe joint for flowing a corrosive fluid has a portion in contact with the fluid made of a component made of a corrosion-resistant synthetic resin, but a spring used for a valve provided in the pipe joint is the same as other components. Since it cannot be formed of a corrosion resistant synthetic resin, the above-mentioned problems occur.

Therefore, as a valve provided in the pipe joint, there has been proposed a structure in which a valve body having a fluid passage hole is arranged inside the joint body so as to be movable in the opening / closing direction, and a coil spring is arranged on the outer peripheral portion of the valve body. ing. That is, in this configuration, a fluid flow hole communicating with the outside of the valve body is formed downstream of the contact point with the joint body in the valve body in the fluid flow direction, and further located downstream of the opening of this hole and outside the valve body. A coil spring is arranged between the partition protrusion formed on the above and the joint body. This allows the fluid to flow without touching the coil spring.

However, in this structure, the cross-sectional area of the fluid circulating portion is smaller than that in the structure in which the outer peripheral side of the valve body is used as the fluid flow passage, so that the joint main body for increasing the flow rate becomes large. There's a problem.

Therefore, for a pipe joint which is conventionally composed of a plug and a socket into which the plug is inserted and connected,
It is required that the spring used for the valve be made of metal and maintain excellent conditions such as strength and springiness, while avoiding corrosion of the spring by the fluid flowing through the fluid passage and providing an excellent valve. There is.

The present invention has been made in view of the above circumstances. The spring used for the valve is made of metal, and the spring is corroded by the fluid flowing through the fluid passage while maintaining excellent strength and spring properties. It is an object of the present invention to provide a pipe joint provided with a valve that can avoid such a situation and that does not reduce the fluid flow rate.

[0012]

To achieve the above object, a pipe joint of the present invention comprises a tubular joint body made of a corrosion-resistant material, and a valve provided in the joint body. The valve includes a cylindrical body portion extending in the axial direction of the joint main body, which is movably arranged inside the joint main body with a fluid circulation gap with respect to an inner peripheral surface of the joint main body, and the cylindrical body portion. It is located at the tip portion and comes into contact with the inner peripheral surface of the joint main body by the axial movement of the cylindrical body portion to form a fluid circulation gap between the inner peripheral surface of the joint main body and the outer peripheral surface of the cylindrical body portion. A valve body made of a corrosion-resistant material having a valve body that opens and closes, a valve guide body made of a corrosion-resistant material that is inserted into the valve body to support the valve body in the axial direction of the joint body, and a cylinder of the valve body. The fluid is disposed inside the body and is supported by the valve body and the valve guide body, and the fluid flows to the valve body. And having a spring applying a spring force in a direction to close the gap.

[0013]

In the structure of the present invention, the valve body having the valve body portion and the tubular body portion is movably arranged inside the joint body with a fluid passage gap, and the tubular body portion of the valve body is A spring, which is supported by the valve body and the valve guide body and applies a spring force to the valve body in a direction of closing the fluid circulation gap, is provided inside, and the fluid circulation portion is located outside the valve body. , A spring is provided inside the valve body. Therefore, the valve body does not come into direct contact with the fluid and is not corroded by the corrosive fluid. As a result, the valve body can be made of metal such as stainless steel in consideration of strength and springiness.

Moreover, in this configuration, since the fluid circulation portion is located outside the valve body, the cross-sectional area of the fluid circulation portion is large and the amount of fluid circulation is large as compared with the case where the fluid circulation hole is formed in the valve body. There is no need to increase the size of the joint body to increase it.

Therefore, according to the present invention, the spring used for the valve is made of metal, and the spring is prevented from being corroded by the fluid flowing in the fluid passage while maintaining excellent strength and spring properties. Moreover, it is possible to obtain a pipe joint provided with a valve that does not reduce the fluid flow rate.

[0016]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which a plug and a socket are connected. In FIG. 1, 1 is a plug, 2 is a socket, and 3 is a lock mechanism for holding the connection state between the plug 1 and the socket 2.

The plug 1 will be described with reference to FIGS. 1 to 3. In the figure, reference numeral 11 denotes a plug main body having a cylindrical body with both ends opened, and one half of the plug main body is formed as a socket insertion portion 11a with an outer diameter smaller than that of the other half. On the inner peripheral portion of the tip opening of the socket insertion portion 11a of the plug body 1, a tapered valve seat surface 12 having a smaller diameter toward the tip is formed, and the screw portion 11 is formed inside the other half.
b is formed, and a connection pipe, for example, a hose (not shown) made of a corrosion-resistant resin is screwed into and connected to the inside of the other half portion.

The inside of the plug body 11 which is a cylindrical body is a passage through which a fluid flows, and a valve 13 for opening and closing this passage is provided at the portion of this passage. The valve 13 has a valve body 14 disposed in an internal passage of the plug body 11 so as to be axially movable on the central axis thereof. This valve body 1
Reference numeral 4 denotes a cylindrical tubular portion 15 that is disposed with a fluid circulation gap 17 with respect to the inner peripheral surface of the plug body 11 and extends in the axial direction of the plug body 11, and a tip portion of the tubular body portion 15. Positioned and moved in the axial direction of the tubular portion 15, the plug body 1
It has a valve body portion 16 which comes into contact with the inner peripheral surface of No. 1 and opens and closes a fluid circulation gap 17 between the inner peripheral surface of the plug body 11 and the outer peripheral surface of the cylindrical body portion 15.

Reference numeral 18 in the drawing denotes a valve guide body, which comprises a round bar-shaped valve guide portion 19 extending in the axial direction of the plug body 11 and a disc portion 20 having a diameter larger than that of the valve guide portion 19. The portion 20 is formed with a communication hole 21 penetrating both side surfaces thereof.

The valve guide body 18 is arranged inside the plug body 11, and the outer peripheral portion of the disk portion 20 is screwed and fixed to the inner peripheral portion of the plug body 11. The valve guide portion 19 is located on the central axis of the plug body 11, and the base end portion of the valve body 14 is movably fitted therein to support the valve body 14.
The communication holes 21 of the disc part 20 communicate with each other inside the plug body 11 partitioned by the disc part 20.

The cylinder portion 15 of the valve body 14 is a compression coil spring 2.
2 is arranged along the axial direction of the plug body 11, and this is supported by the valve body portion 16 of the valve body 14 and the end surface of the valve guide portion 19 of the valve guide body 18. As a result, the valve body 14 is pushed by the coil spring 22 and moved in the valve closing direction, and the valve body portion 16 contacts the valve seat surface 12 formed on the inner peripheral portion of the tip opening of the plug body 11. A seal ring 23 is provided outside the valve body 16, and the seal ring 23 serves as the valve seat 12
Contact with. As a result, the tip end opening of the plug body 11 is closed by the valve body 14 and the internal passage of the plug body 11 is closed.

The plug body 11, the valve body 14 and the valve guide body 18 are made of metal such as stainless steel and are coated with a resin having corrosion resistance. Alternatively, the whole is made of a resin having corrosion resistance. Coil spring 2
0 is formed of metal such as stainless steel. Also,
The plug body 11 is provided with a seal ring 24 at a contact portion with the disc portion 20 of the valve guide body 18, and the valve guide portion 19 of the valve guide body 18 is provided with a seal ring 25 at a contact portion with the valve body 14. Has been.

The socket 2 will be described with reference to FIGS. 1 to 4. In the figure, reference numeral 31 denotes a socket main body having a cylindrical body with both ends opened, and one half of the socket main body is a plug receiving portion 31a.
Is formed with a smaller outer diameter than the other half.
A tapered valve seat surface 32 is formed on the inner peripheral portion of the tip opening of the plug receiving portion 31a of the socket body 1 toward the tip, and the threaded portion 3 is formed inside the other half.
1b is formed, and a connecting pipe, for example, a hose (not shown) made of a corrosion-resistant resin is screwed into and connected to the inside of the other half portion.

The inside of the socket body 31 which is a cylindrical body is a passage through which a fluid flows, and a valve 33 for opening and closing this passage is provided in the portion of this passage. The valve 33 has a valve body 34 arranged in the internal passage of the socket body 31 so as to be axially movable on the central axis thereof. The valve body 34 is arranged with a fluid circulation gap 37 with respect to the inner peripheral surface of the socket body 31, and has a cylindrical cylindrical body portion 35 extending in the axial direction of the socket body 31, and the cylindrical body portion 35. The fluid passage gap 37 between the inner peripheral surface of the socket body 31 and the outer peripheral surface of the cylindrical body portion 35 is located at the tip portion and comes into contact with the inner peripheral surface of the socket body 31 due to the axial movement of the cylindrical body portion 35.
Has a valve body portion 36 for opening and closing.

Reference numeral 38 in the drawing denotes a valve guide body, which comprises a round bar-shaped valve guide portion 39 extending in the axial direction of the socket body 31, and a disc portion 40 having a diameter larger than the valve guide portion 39. The portion 40 is formed with a communication hole 41 penetrating both side surfaces thereof. The valve guide body 38 is disposed inside the socket body 31, and the outer peripheral portion of the disc portion 40 is the socket body 31.
It is screwed and fixed to the inner peripheral portion of the. The valve guide portion 39 is located on the central axis of the socket body 31, and the base end portion of the valve body 34 is movably fitted therein to support the valve body 34. The communication holes 41 of the disc portion 40 communicate with each other inside the socket body 31 partitioned by the disc portion 40.

The cylindrical portion 35 of the valve body 34 is a compression coil spring 4
2 is arranged along the axial direction of the socket body 31, which is a valve body portion 36 of the valve body 34 and a valve guide portion 39 of the valve guide body 38.
It is supported by the end face of. As a result, the valve body 34 is pushed by the coil spring 42 and moved in the valve closing direction, and the valve body portion 36 is moved.
Comes into contact with the valve seat surface 42 formed on the inner peripheral portion of the tip opening of the socket body 31. A seal ring 43 is provided outside the valve body portion 36 so that the seal ring 43 contacts the valve seat 32. This allows the socket body 3
1 is closed by the valve body 34 and the socket body 31
The internal passage of the is closed.

The socket body 31, the valve body 34, and the valve guide body 38 are made of metal such as stainless steel, and are surface-coated with a resin having corrosion resistance. Alternatively, the whole is made of a resin having corrosion resistance. The coil spring 42 is made of metal such as stainless steel. Further, the socket body 31 is provided with a seal ring 44 at a contact portion of the valve guide body 38 with the disc portion 40, so that the valve guide body 38
A seal ring 45 is provided at the contact portion with the valve body 34 in the valve dark interior 39.

The lock mechanism 3 will be described with reference to FIGS. 1 to 4. The lock mechanism 3 is provided in the plug receiving portion 32 of the socket body 31 and holds the plug body 11 inserted in the plug receiving portion 32 of the socket body 31. The lock mechanism 3 is formed on the outer periphery of the socket body 31 so as to be movable between a lock position and an unlock position that are set in the axial direction of the socket body 31, and penetrates the socket body 11 inward and outward. Hole 53
An elastic locking member 5 which is disposed so as to be displaceable inward and outward from the socket body and is made of an elastic material such as synthetic resin.
And 2.

The elastic locking member 52 has, for example, a hole 53.
And a support portion 52b located outside the socket body 31, and the support portion 52b is attached to a protrusion 54 formed on the outer peripheral portion of the socket body 31. As a result, the elastic locking member 52 is supported so as to be displaceable in the socket body inward and outward directions about the protrusion 54,
As a whole, the elastic force acts toward the outer side of the socket body. A plurality of holes 54 are formed in the socket body 31 in the circumferential direction, and each of the holes 54 is provided with an elastic locking member 52.

A compression coil spring 55, which is located inside the sleeve 51 and exerts a spring force on the sleeve 51 in the locking direction, is provided on the outer peripheral portion of the socket body 31. At the tip portion of the plug body 11, a recessed portion 56 in which the portion of the locking portion 52a of the elastic locking member 52 protruding from the hole portion 53 to the inside of the socket body 31 is locked, and the socket body with respect to this recessed portion 56 A protrusion 57 is formed on the front side in the insertion direction to push the elastic locking member 52 toward the outside of the socket body 31. These recesses 56 and protrusions 5
Reference numeral 7 denotes an annular strip extending along the circumferential direction of the socket body 31. The surfaces on both sides of the recess 56 and the protrusion 57 are inclined.

The inner peripheral portion of the sleeve 51 holds the elastic locking member 52 when it moves to the lock position, and the elastic locking member 52.
A pressing portion 58 for projecting the locking portion 52a of the above from the hole portion 53 to the inside of the socket main body 31 and a relief portion 59 for releasing the elastic locking member 52 to the outside of the socket main body 31 when moved to the unlocked position are respectively formed. ing. The pressing portion 58 and the relief portion 59 form a ring along the circumferential direction of the sleeve 51.

Reference numeral 60 is a ring which is provided on the outer peripheral portion of the tip of the plug receiving portion 11a of the socket body 31 and which stops the sleeve 51 pressed by the coil spring 55. Reference numeral 61 denotes a plug body 1 that is provided on the inner peripheral portion of the tip of the plug receiving portion 11a of the socket body 31 and is inserted into the plug receiving portion 11a.
It is a seal ring that contacts 1.

In the lock mechanism 3, the sleeve 51 is normally pushed by the coil spring 55 to the lock position as shown in FIGS. 1, 2 and 4, and the holding portion 58 is provided.
Covers the hole 53 of the socket body 31 in which the elastic locking member 52 is arranged from the outside of the socket body 31.

The operation of connecting the plug 1 and the socket 2 in the pipe joint thus constructed will be described. The tip opening of the plug body 11 is closed by the valve body 14 to close the internal passage of the plug body 11, and the tip opening of the socket body 31 is closed by the valve body 34 to close the internal passage of the socket body 31. . As shown in FIG. 2, the socket insertion portion 11a of the plug body 11 is inserted into the plug receiving portion 31a of the socket body 31. Then, the valve body 14 of the valve 13 protruding from the tip opening of the socket insertion portion 11a of the plug body 11 and the valve body 34 of the valve 33 protruding from the tip opening of the plug receiving portion 31a of the socket body 31 come into contact with each other.

Further, when the socket insertion portion 11a of the plug body 11 is inserted into the plug insertion portion 31a of the socket body 31, the valve bodies 14 and 34 are plugged against the spring force of the coil spring 22 and the coil spring 42. Valve seat surface 1 of main body 11
2 from the valve seat surface 32 of the socket body 31 to the inner side of the plug body 11 and the socket body 31, respectively. For this reason,
The valve body portion 16 of each valve body 14 and the valve body portion 36 of the valve body 34 are separated from the valve seat surface 12a of the plug body 11 and the valve seat surface 32 of the socket body 31, so that the tip opening of the plug body 11 and the socket body. The tip openings of 31 are opened respectively.

As a result, the internal passage of the plug main body 11 and the internal passage of the socket main body 31 are opened, respectively, and the internal passage of the plug main body 11 and the internal passage of the socket main body 31 mutually pass through the tip openings of the main bodies 11, 13. Communicate. The fluid is, for example, the inside of the other half of the plug body 11—the gap 17 between the inner peripheral surface of the plug body 11 and the valve body 14—the gap between the inner peripheral surface of the socket body 31 and the valve body 34—the socket body 31 It flows to the other half.

The operation of the lock mechanism 3 when connecting the plug 1 and the socket 2 will be described. The sleeve 51 is pushed by the coil spring 55 and is in the lock position, and the holding portion 58 of the sleeve 51 covers the hole portion 53 of the socket body 31 in which the elastic locking member 52 is arranged from the outside of the socket body 31. At the time of connecting to the socket body 31 of the plug body 11, by inserting the tip portion of the plug body 11 into the plug receiving portion 31a of the socket body 31, as shown in FIG. Body 3
The portion of the elastic locking member 52 protruding inside the first plug receiving portion 31a is pushed toward the outside of the plug receiving portion 31a.

The elastic locking member 52 is pushed by the projection 57 of the plug body 11 and elastically deforms toward the outside of the plug receiving portion 32. Therefore, the elastic locking member 52 is pushed into the hole portion 52 of the socket body 32 and allows the plug body 11 to pass therethrough. When the protrusion 57 passes through the elastic locking member 52, the concave portion 56 of the plug body 11 moves into the elastic locking member 52.
Reach the part. As shown in FIG. 1, the elastic locking member 52 is elastically deformed in the concave portion 56 of the plug body 11 toward the inside of the plug receiving portion 32, and protrudes toward the inside of the plug receiving portion 32 again by its own force. Lock in the recess.

The elastic locking member 52 is pressed from the outside of the socket main body 31 by the pressing portion 58 of the sleeve 51 and projects toward the inside of the plug receiving portion 32 so that the elastic force acts toward the inside of the plug receiving portion 31a. It is locked in the recess 56 of the plug body 11. Even when the plug main body 11 is pulled in the direction of pulling out from the socket main body 31, the recess 56 of the plug main body 11 cannot elastically deform the elastic locking member 52 toward the outside of the socket main body 31, so that the elastic locking member 51 is not deformed.
The engagement with the recess 56 of the plug body 11 is maintained.

As a result, the tip of the plug body 11 is connected and held to the socket body 31 via the elastic locking member 52. Due to such an action of the elastic locking member 52, when the plug 1 and the socket 2 are connected, the connection between the plug 1 and the socket 2 is locked only by inserting the plug body 11 into the socket body 31 without moving the sleeve 52. be able to.
This locking operation is interlocked with the operation in which the plug body 11 and the socket body 31 communicate with each other, and the locking ends when the plug body 11 and the socket body 31 communicate with each other.

The operation of the pipe joint when the plug 1 and the socket 2 are separated will be described. The operation of the lock mechanism 3 when the plug 1 and the socket 2 are separated will be described. The sleeve 51 is moved against the spring force of the coil spring 55 to be located at the lock release position. Then, as shown in FIG. 3, the pressing portion 58 of the sleeve 51 comes out of the position of the hole portion 53 of the plug receiving portion 32 of the socket body 31, and the escape portion 59 reaches the position of the hole portion 53. The elastic locking member 52 is released from the pressing state of the pressing portion 58 of the sleeve 51, and is displaced toward the outside of the socket body 11 by its own elastic force.

Then, the plug body 11 is connected to the socket body 3
When it is moved in the direction of pulling out from 1, the concave portion 56 moves from the position of the elastic locking member 52, the protrusion 57 reaches the position of the elastic locking member 52, and the elastic locking member 52 is moved to the outside of the socket body 11. Push towards. As a result, the connection between the plug body 11 and the socket body 31 is released and the plug 1
And the socket 2 are separated.

Further, the plug body 11 is replaced with the socket body 31.
The valve 1 of the plug body 11 moves when it is pulled out from the plug body 11.
The valve element 14 of No. 3 and the valve element 34 of the valve 33 of the socket body 31 are separated from each other. Then, the valve element 14 and the valve element 34 are pushed by the coil spring 22 and the coil spring 42 to move forward and come into contact with the valve seat surface 12 of the plug body 11 and the valve seat surface 32 of the socket body 31.

Therefore, the tip end opening of the plug body 11 is closed by the valve body 14 to close the internal passage of the plug body 11, and the tip end opening of the socket body 31 is closed by the valve body 34 so that the inside of the socket body 31 is closed. The passage is closed.

A plug 1 which is such a pipe joint of the present invention
Since the socket 13 is equipped with the valves 13 and 33 having the above-described configuration, it has the following effects. Since the valves 13 and 33 provided in the plug 1 and the socket 2 have the same configuration, the valve 13 provided in the plug 11 will be described here as an example.

That is, in the plug 11, the valve body 14 having the valve body portion 16 and the cylindrical body portion 15 is movably arranged inside the plug body 11 with a fluid circulation gap 17 therebetween. A spring 22 that is supported by the valve body 14 and the valve guide body 18 and that applies a spring force to the valve body 14 in the direction of closing the fluid circulation gap 17 is provided inside the cylindrical body portion 15 of 14. The portion is located outside the valve body 14, and the spring is provided inside the valve body.

Therefore, the valve body 14 does not come into direct contact with the fluid and is not corroded by the corrosive fluid flowing through the fluid circulating portion. As a result, the valve body 14 can be formed of metal such as stainless steel in consideration of strength and springiness. The coil spring 22 made of metal such as stainless steel may be surface-coated with a resin having corrosion resistance in order to improve reliability.

Moreover, in this configuration, since the fluid circulating portion is located outside the valve body 14, the cross-sectional area of the fluid circulating portion is large as compared with the case where the fluid circulating hole is formed in the valve body 14.
It is not necessary to enlarge the plug body 11 in order to increase the fluid flow rate.

Therefore, according to the present invention, the spring 22 used in the valve 13 is made of metal, and the spring 22 is corroded by the fluid flowing through the fluid passage while maintaining excellent strength and spring properties. It is possible to obtain the plug 11 provided with a valve that avoids the above and does not reduce the fluid flow rate. Note that the pipe joint provided with the lock mechanism of this embodiment, which can obtain the same plug effect as the above-described effect in the socket 2, can be summarized as follows. That is,
"A plug having a tubular plug body, a socket having a tubular socket body into which a tip portion of the plug body is removably inserted, and the socket body provided in the socket body of the socket body And a lock mechanism for holding the plug body inserted into the socket body, wherein the lock mechanism is provided on an outer peripheral portion of the socket body so as to be movable between a lock position and an unlock position set in the axial direction thereof. And a resilient locking member that is disposed so as to be displaceable in the socket body inward and outward directions in a hole formed in the socket body to penetrate inward and outward, and applies an elastic force toward the socket body outward direction. And a spring that applies a spring force to the sleeve in the locking direction is provided on the socket body, and Portion where the portion of the elastic locking member that protrudes to the inside of the socket body locks, and the elastic locking member that is located on the front side in the socket body insertion direction with respect to this recess is positioned outside the socket body. Projections for pushing the elastic locking members toward the inside of the socket main body, the pressing portions pressing the elastic locking members when the sleeve is moved to the lock position, and pressing the elastic locking members toward the inside of the socket body; The pipe joints are each formed with a relief portion that allows the elastic locking member to escape to the outside of the socket body when moved to the lock release position. "

The lock mechanism provided in the conventional pipe joint has the following problems. When connecting and disconnecting the plug body from the socket body, move the sleeve each time to lock the ball in the recess of the plug body,
Since it is detached, the operation of connecting and disconnecting the plug with respect to the socket is troublesome. For this reason, conventionally, it has been required to conveniently operate a lock mechanism for locking a plug and a socket into which the plug is inserted and connected when the plug and the socket are connected.

On the other hand, the lock mechanism 3 of this embodiment
Only operates the sleeve 51 only when the plug 1 and the socket 2 are separated, and it is not necessary to operate the sleeve 51 when connecting the two, and thus it is necessary to operate the sleeve 51 both when connecting and disconnecting. The operation is simplified as compared with the conventional lock mechanism. Therefore, according to the above configuration, it is possible to obtain the pipe joint in which the operability of the lock mechanism 3 that locks the plug 1 and the socket 2 at the time of connection is improved. It should be noted that the present invention is not limited to the above-mentioned embodiment, and various modifications can be carried out.

[0052]

As described above, according to the pipe joint of the present invention, the valve body having the valve body portion and the tubular body portion is movably arranged inside the joint body with a fluid passage gap. In addition, a spring that is supported by the valve body and the valve guide body and that applies a spring force to the valve body in a direction of closing the fluid circulation gap is provided inside the cylindrical body portion of the valve body. Is located outside the valve body, and the spring is provided inside the valve body. Therefore, the valve body does not come into direct contact with the fluid and is not corroded by the corrosive fluid. As a result, the valve body is strong,
It can be formed of a metal such as stainless steel in order to secure conditions such as springiness.

In addition, in the structure of the present invention, since the fluid circulating portion is located outside the valve body, the cross-sectional area of the fluid circulating portion is large and the fluid circulating portion is large as compared with the case where the fluid circulating hole is formed in the valve body. There is no need to increase the size of the joint body to increase the volume.

Therefore, according to the present invention, the spring used for the valve is made of metal to maintain excellent strength and spring property, while avoiding corrosion of the spring by the fluid flowing through the fluid passage. Moreover, it is possible to obtain a pipe joint provided with a valve that does not reduce the fluid flow rate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a plug and a socket are connected in a pipe joint according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a process of connecting a plug and a socket in the same embodiment.

FIG. 3 is a sectional view showing a process of separating a plug and a socket in the same embodiment.

FIG. 4 is a sectional view showing a socket according to the embodiment.

[Explanation of symbols]

1 ... Plug, 2 ... Socket, 3 ...
Lock mechanism, 11 ... Plug body, 13 ...
Valve, 14 ... Valve body, 15 ... Cylindrical body part, 16 ... Valve body part, 18 ... Valve guide body, 22 ... Spring, 31 ... Socket body, 33 ... Valve, 34 ... Valve body,
35 ... Cylindrical body part, 36 ... Valve body part,
38 ... Valve guide body, 42 ... Spring,
51 ... Sleeve, 52 ... Elastic locking member,
55 ... Spring.

Claims (1)

[Claims] 1. A tubular joint body, and a valve provided in the joint body, wherein the valve has a fluid passage gap inside the joint body with respect to an inner peripheral surface of the joint body. A cylindrical body portion that extends in the axial direction of the joint body and a distal end portion of the cylindrical body portion that is disposed in contact with the inner peripheral surface of the joint body by the axial movement of the cylindrical body portion. A valve body having a valve body portion that opens and closes a fluid communication gap between the inner peripheral surface of the joint body and the outer peripheral surface of the cylindrical body portion, and the valve body is inserted into the valve body to attach the valve body to the shaft of the joint body. A pipe having a valve guide body that is supported in a direction, and a spring that is disposed inside the tubular body portion of the valve body and that applies a spring force to the valve body in a direction of closing the fluid flow gap. Fittings.