JP5333718B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint for connecting, for example, a high-pressure pipe used in a hydraulic device or the like.

  Conventionally, as this type of pipe joint, a socket connected to one pipe, a plug connected to the other pipe, and an axially movable socket are provided in the socket, and the valve seat on the socket side is provided by a spring. A socket-side valve element that closes the socket-side flow path by press-contacting, and a plug-side flow path that closes the plug-side valve seat by spring contact with the plug-side valve seat. A plug-side valve body, a plurality of balls that are provided on the socket side so as to be movable in the radial direction, and that engage with the engagement portion on the plug side to restrict axial movement of the plug, and an axial direction on the socket side There is known a device provided with a lock sleeve that is movably provided and restricts movement of each ball in the disengagement direction by moving in one axial direction (see, for example, Patent Document 1).

In this pipe joint, when the lock sleeve is moved in the other axial direction and the plug is inserted into the socket, the valve bodies retreat from the valve seats with their tips abutting each other, and the valve bodies are opened to release the socket and the plug. These flow paths communicate with each other. When the plug is inserted into the socket, each ball engages with the engaging portion of the plug, and when the lock sleeve moves in one axial direction, the movement of each ball in the radially outward direction (disengagement direction) is restricted. The socket and the plug are locked in a coupled state.
JP 2003-202096 A

  By the way, in the said pipe joint, since the load is applied to the engaging part from each ball | bowl by the pressure of an internal fluid, when a high pressure fluid is used, an engaging part deform | transforms and becomes the cause of reducing the lifetime of a plug. However, if a high-strength material is used for the plug body to improve the service life, breakage tends to occur at a threaded portion (pipe connection portion) or the like that requires toughness. In addition, when a material other than steel is used for the plug body (stainless steel, brass, etc.), it becomes difficult to harden the ball engaging portion of the plug body by quenching or the like, and water or corrosive fluid In the case of, it could not be used at high pressure.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to increase the strength of the engaging portion of the plug body with the ball without forming the plug body with a high-strength material. It is to provide a pipe joint that can be used.

In order to achieve the above object, the present invention is provided with a socket connected to one pipe, a plug connected to the other pipe, a radially movable side on the socket side, and an engagement portion on the plug side. In a pipe joint comprising a plurality of balls for restricting axial movement of the plug by engaging with each other , the engaging portion is provided on a member made of a material harder than the plug main body , and the engaging portion is provided. Are formed by an annular member mounted on the outer peripheral surface of the plug body, and provided with an annular recess for fitting the annular member on the outer peripheral surface of the plug body, and the annular member is divided into a plurality of divided portions in the circumferential direction of the plug body In addition, the annular member is formed such that the inner diameter with which the circumferential ends of the divided portions are in contact with each other is larger than the outer diameter of the concave portion of the plug body .

Thereby, since the engaging part with which each ball | bowl of a socket engages is formed with a material harder than a plug main body, even when using a high pressure fluid, an engaging part does not deform | transform easily. In this case, since the engaging portion is provided on a member harder than the plug main body, the strength of the engaging portion can be increased without forming the plug main body from a high-strength material. Further, since the annular member is mounted on the outer peripheral surface of the plug body, the annular member can be easily provided on the plug body. In this case, since the annular member is fitted into an annular recess provided on the outer peripheral surface of the plug body, the annular member can be reliably attached to the plug body. Further, since the annular member is formed by a plurality of divided portions divided in the circumferential direction of the plug body, the annular member can be easily mounted from the outside of the plug body. In this case, the annular member is formed so that the inner diameter where the circumferential end portions of the divided portions are in contact with each other is larger than the outer diameter of the concave portion of the plug body. Even in this case, the outer diameter of the concave portion does not become larger than the inner diameter obtained by bringing the divided portions into contact with each other.

According to the present invention, even when a high-pressure fluid is used, the engaging portion with the ball is not easily deformed, so that durability and life can be improved. In this case, since the strength of the engaging portion can be increased without forming the plug body with a high-strength material, the plug body can be formed with an arbitrary material according to the working fluid and use conditions. In addition, since the annular member can be easily provided on the plug body, the assembly work of the plug can be performed efficiently. In this case, since the annular member can be securely attached to the plug body, there is an advantage that the annular member is not dropped or displaced. Further, since the annular member can be easily attached from the outside of the plug main body, the assembling work can be easily performed. In this case, for example, even when a dimensional error or thermal expansion occurs, the outer diameter of the concave portion does not become larger than the inner diameter where the divided portions are brought into contact with each other. Can be prevented.

  1 to 7 show a first embodiment of the present invention. FIG. 1 is a partial sectional side view of a pipe joint, FIG. 2 is a partial sectional side view of a socket, and FIG. 3 is a partial sectional view of a plug. 4 is a partial side cross-sectional view of the plug main body, FIG. 5 is a partial side cross-sectional view illustrating the mounting process of the annular member, FIG. 6 is a radial cross-sectional view thereof, and FIG. It is radial direction sectional drawing.

  This pipe joint includes a socket 10 connected to one pipe (not shown) and a plug 20 connected to the other pipe (not shown). By connecting the socket 10 and the plug 20, a flow path on the socket 10 side is formed. 10a communicates with the flow path 20a on the plug 20 side.

  The socket 10 includes a socket body 11 having a flow path 10a therein, a valve body 12 that opens and closes the flow path 10a of the socket body 11, a plurality of balls 13 provided in the socket body 11 so as to be movable in a radial direction, Each ball 13 includes a lock sleeve 14 that restricts movement of each ball 13 in the radial direction.

  The socket body 11 is formed so that the plug 20 can be inserted on one end side in the axial direction, and a tapered valve seat 11a with which the valve body 12 abuts in the axial direction is provided on the inner peripheral surface on one end side in the axial direction. . A pipe connection part 11 b is provided on the other axial end side of the socket body 11, and the pipe connection part 11 b is formed by a screw part (not shown) formed on the inner peripheral surface of the socket body 11. A plurality of holding holes 11c for holding each ball 13 movably in the radial direction are provided at one end side in the axial direction of the socket body 11 at intervals in the circumferential direction. It is formed so as to penetrate through. Further, a sealing material 11d made of an annular rubber is provided on the inner peripheral surface on one axial end side of the socket body 11, and the space between the socket body 11 and the plug 20 is sealed by the sealing material 11d. .

  The valve body 12 is held in the socket main body 11 so as to be movable in the axial direction via a guide member 12 a, and its tip end is brought into contact with the valve seat 11 a of the socket main body 11. The valve body 12 has a contact surface with the valve seat 11a formed in a tapered shape, and a protruding portion 12b protruding in the axial direction is provided on the tip side thereof. The guide member 12a is fixed to the inner peripheral surface of the socket body 11, and is formed so that a fluid can flow by opening a part of the circumferential direction in the axial direction. A spring 12c that presses the valve body 12 toward the valve seat 11a is attached to the guide member 12a, and the socket-side flow path 10a is closed by pressing the valve body 12 against the valve seat 11a by the spring 12c. ing.

  Each ball 13 is held in the holding hole 11c of the socket body 11 so as to be movable in the radial direction, and a part of the ball 13 protrudes outside or inside the holding hole 11c.

  The lock sleeve 14 is formed of a cylindrical member that is provided on the outer peripheral surface side of the socket body 11 so as to be movable in the axial direction. The outer peripheral surface is knurled to prevent slipping. On the inner peripheral surface of the lock sleeve 14, an annular contact portion 14a capable of contacting each ball 13 in the radial direction is projected, and one end surface in the axial direction of the contact portion 14a is tapered. The lock sleeve 14 is urged in one axial direction by a spring 14b. When the lock sleeve 14 moves in one axial direction, the contact portion 14a comes into contact with each ball 13, and a part of each ball 13 is part of the socket body 11. The balls 13 protrude radially inward from the inner peripheral surface of the ball 13 so that the movement of the balls 13 outward in the radial direction is restricted. Further, when the lock sleeve 14 is moved in the other axial direction, the contact between the contact portion 14a and each ball 13 is released, and each ball 13 can be moved radially outward.

  The plug 20 includes a plug main body 21 having a flow path 20a therein, a valve body 22 for opening and closing the flow path 20a in the plug main body 21, and an annular member 23 with which each ball 13 of the socket 10 is engaged. Yes.

  The plug body 21 is formed so that one end in the axial direction can be inserted into one end in the axial direction of the socket body 11, and a tapered valve seat in which the valve body 22 abuts in the axial direction on the inner peripheral surface of the one end in the axial direction. 21a is provided. A pipe connecting portion 21 b is provided on the other axial end side of the plug main body 21, and the pipe connecting portion 21 b includes a screw portion (not shown) formed on the inner peripheral surface of the plug main body 21. An annular recess 21 c to which the annular member 23 is attached is provided on the outer peripheral surface of the plug body 21.

  The valve body 22 is held in the plug main body 21 so as to be movable in the axial direction via a guide member 22 a, and its distal end is brought into contact with the valve seat 21 a of the plug main body 21. The valve body 22 has a tapered contact surface with the valve seat 21a, and a protruding portion 22b protruding in the axial direction is provided on the tip side. The guide member 22a is fixed to the inner peripheral surface of the plug main body 21 and is formed to allow fluid to flow by opening a part of the circumferential direction in the axial direction, like the guide member 12a of the socket 10. Further, a spring 22c that presses the valve body 22 toward the valve seat 21a is attached to the guide member 22a, and the plug-side flow path 20a is closed by pressing the valve body 22 against the valve seat 21a by the spring 22c. It has become.

  The annular member 23 includes two divided portions 23 a divided in the circumferential direction of the plug main body 21, and the respective divided portions 23 a are fitted into the concave portions 21 c of the plug main body 21 to be attached to the plug main body 21. ing. The annular member 23 is formed of a material harder than the plug body 21 such as hardened carbon steel, alloy steel, martensitic stainless steel, tungsten carbide (super hard alloy), etc. A concave engaging portion 23b with which the ball 13 is engaged is provided continuously in the circumferential direction. As shown in FIG. 7, the annular member 23 is formed such that the inner diameter D1 in which the circumferential ends of the divided portions 23 a are in contact with each other is larger than the outer diameter D2 of the bottom surface of the recess 21 c of the plug body 21. Yes. A chamfer 23c that is inclined downward toward the inside in the radial direction is provided at the outer peripheral surface side edge of the circumferential end of each divided portion 23a, and the chamfer 23c may be curved. . The annular member 23 is fixed in the recess 21 c by a fixing portion 21 d provided on the plug body 21, and the fixing portion 21 d is formed by deforming a part of the plug body 21. That is, a projecting portion 23d projecting in the axial direction is provided on the radially inner side of one end surface in the axial direction of the annular member 23, and after the annular member 23 is fitted in the recess 21c as shown in FIG. By forming the fixing portion 21d by making the edge portion of the recess 21c of the plug main body 21 bend toward the annular member 23 by radial caulking, the fixing portion 21d is engaged with the protruding portion 23d in the radial direction. Movement of the member 23 outward in the radial direction is restricted. In this case, a radial gap is formed between the inner peripheral surface of the annular member 23 and the outer peripheral surface (bottom surface) of the recess 21c due to a dimensional difference between the inner diameter D1 and the outer diameter D2.

  In the pipe joint configured as described above, when the lock sleeve 14 is moved from one side to the other side in the axial direction and the plug 20 is inserted into the socket 10, the valve bodies 12 and 22 are connected to the projections 12b and 22b at the tip. Retracting from the valve seats 11a and 21a while contacting each other, the valve bodies 12 and 22 are opened, and the flow paths 10a and 20a of the socket 10 and the plug 20 communicate with each other. When the plug 20 is inserted into the socket 10, each ball 13 engages with the engaging portion 23 b of the plug 20, and the lock sleeve 14 moves from the other side in the axial direction to one side, so that the contact portion 14 a of the lock sleeve 14. This restricts the movement of each ball 13 in the radially outward direction (disengagement direction), and the socket 10 and the plug 20 are locked in a coupled state. Here, when fluid pressure is applied to the socket 10 and the plug 20, a load is also generated on each ball 13, but the engaging portion 23 b with which each ball 13 engages is formed of a material harder than the plug body 21. Therefore, even when a high pressure fluid is used, the engaging portion 23b is not easily deformed.

  Thus, according to the present embodiment, the engaging portion 23b with which each ball 13 of the socket 10 engages is formed of a material harder than the plug body 21, so that the engaging portion 23b can be used even when high pressure fluid is used. However, it is possible to improve durability and life without being easily deformed. In this case, since the engaging portion 23b is provided in the annular member 23 formed separately from the plug main body 21, the strength of the engaging portion 23b can be increased without forming the plug main body 21 from a high-strength material. In addition, the plug body 21 can be formed of any material according to the fluid and conditions of use.

  Further, since the annular member 23 is mounted on the outer peripheral surface of the plug body 21, the annular member 23 can be easily provided on the plug body 21, and the assembly work of the plug 20 can be performed efficiently.

  In this case, since the annular member 23 is fitted into the annular recess 21c provided on the outer peripheral surface of the plug body 21, the annular member 23 can be securely attached to the plug body 21, and the annular member 23 is dropped. There is an advantage that no positional deviation occurs.

  Further, since the annular member 23 is formed by a plurality of divided portions 23a divided in the circumferential direction of the plug body 21, the annular member 23 can be easily attached from the outside of the plug body 21, and the assembly work is easily performed. be able to.

  In this case, the annular member 23 is formed so that the inner diameter D1 where the circumferential ends of the divided portions 23a are in contact with each other is larger than the outer diameter D2 of the concave portion 21c of the plug body 21. Even if this occurs, the outer diameter D2 of the recess 21c does not become larger than the inner diameter D1 with which the divided portions 23a are brought into contact with each other, and the generation of gaps between the divided portions 23a can be reliably prevented. .

  Further, since the chamfered portion 23c is provided at the outer peripheral surface side edge of the circumferential end portion of each divided portion 23a, the contact portion between the circumferential end portions of each divided portion 23a is made larger than the outer diameter of other portions. Even when the radial displacement of each divided portion 23a occurs, the ball 13 does not come into contact with the stepped portion, and the end portion of the divided portion 23a due to contact with the ball 13 is lost. It can be surely prevented.

The partial cross section side view of the pipe joint which shows the 1st Embodiment of this invention Partial cross-sectional side view of socket Partial cross-sectional side view of plug Partial side sectional view of the plug body Partial side sectional view showing the mounting process of the annular member Radial cross section showing mounting process of annular member Radial cross section of plug body with annular member

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Socket, 13 ... Ball | bowl, 20 ... Plug, 21 ... Plug main body, 21c ... Recessed part, 23 ... Ring member, 23a ... Split part, 23b ... Engagement part, 23c ... Chamfering part.

Claims (3)

A socket connected to one pipe, a plug connected to the other pipe, and a radial movement on the socket side so that the plug can be moved in the axial direction by engaging with an engagement portion on the plug side. In a pipe joint provided with a plurality of balls for regulating
The engaging portion is provided on a member made of a material harder than the plug body ,
The member provided with the engaging portion is formed by an annular member attached to the outer peripheral surface of the plug body,
An annular recess for fitting the annular member on the outer peripheral surface of the plug body is provided,
While forming the annular member by a plurality of divided parts divided in the circumferential direction of the plug body,
A pipe joint characterized in that the annular member is formed so that the inner diameter with which the circumferential ends of the respective divided portions abut each other is larger than the outer diameter of the concave portion of the plug body . Pipe joint according to claim 1, characterized in that a chamfered portion the on the outer peripheral surface side edge of the circumferential end portion of each of the divided portions. The plug body is provided with a fixing portion for fixing the annular member in the recess, and the fixing portion is formed so as to restrict movement of the annular member radially outward by deforming a part of the plug body. The pipe joint according to claim 1 or 2 , wherein the pipe joint is characterized.

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