JP4358425B2 - Pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint that is connected to a connection hole of an external fluid device, and more particularly to a pipe joint that can be attached in a one-touch manner.
[0002]
[Prior art]
Various pipe joints for connecting fluid flow pipes are known.
FIG. 5 is a cross-sectional view showing the general pipe joint 100.
In FIG. 5, reference numeral 102 denotes a tubular joint body, and a threaded portion 104 for screwing the pipe joint 100 itself to an external fluid device (not shown) or the like is formed on the left end side. The joint main body 102 is manufactured by cutting, and therefore brass having good machinability is generally used as a material.
[0003]
Reference numeral 106 denotes a guide cylinder whose left end is press-fitted and connected to the inside of the right end of the joint body 102, and 108 is a ring-shaped stopper fixed by caulking inside the left end of the guide cylinder 106.
Reference numeral 110 denotes an open cylinder made of a synthetic resin material, and is inserted into the right end side of the guide cylinder 106 so as to be movable along the axial direction.
Reference numeral 112 denotes a ring-shaped lock claw formed by using a thin metal plate having elasticity, and is disposed inside the guide cylinder 106 and on the right side of the stopper 108.
A seal ring 116 is formed in a ring shape using a rubber material, and is in close contact with the outer wall of the inserted tube to prevent fluid leakage.
The channel pipe is inserted into the joint body 102 through the open cylinder 110, and the lock claw 112 bites into the outer wall of the pipe, thereby preventing the pipe from being pulled out. When pulling out the tube, it can be pulled out by releasing the biting of the lock claw 112 into the outer wall of the tube by pushing the open cylinder 110.
[0004]
[Problems to be solved by the invention]
The pipe joint 100 is attached to an external fluid device by winding a seal tape around a screw portion (taper screw, parallel screw) 104 and screwing it into a female screw hole provided in the fluid device. However, it is troublesome and time-consuming to screw a large number of pipe joints 100 into the female screw holes of the fluid device each time.
[0005]
Therefore, the present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a pipe joint that can be attached to an external fluid device in a one-touch manner, and that can realize downsizing of the entire product and reduction of manufacturing cost. It is to provide.
[0006]
[Means for Solving the Invention]
According to the pipe joint according to the present invention, a fluid flow path is formed, and one end side where the fluid flow path opens is formed in the pipe insertion opening, and is located inward of the pipe insertion opening and inserted from the pipe insertion opening. A joint body provided with a lock claw that bites into the outer wall of the pipe to prevent the pipe from being pulled out, and formed at the other end side of the joint body, the other end side of the fluid flow path is opened, and an external fluid device In a pipe joint comprising an attachment portion for attaching the joint body to the connection hole of
The attachment portion is formed on the other end side of the joint body, and the other end side of the fluid flow path is open, and is formed in a ring shape using a tubular base body that can enter the connection hole and an elastic material. A zigzag ring shape in which a plurality of radially outer cut portions and inner cut portions are alternately formed from the outer edge and the inner edge, and the outer ring portion and the inner ring portion are connected by a connecting portion. None, a portion extending from the outer edge side to a certain width is bent and formed in the claw portion so as to spread backward and outward with respect to the insertion direction of the base into the connection hole. A locking ring that is mounted and capable of biting into the inner wall of the connection hole, and a pressing ring that is provided on the base and fixes the locking ring on the base, and is provided on the base. A seal ring It is characterized in. According to this, it can attach to an external fluid apparatus by a one-touch type | mold, and also can implement | achieve size reduction of the whole product and reduction of manufacturing cost.
[0007]
Further, the base body has a large diameter portion on the joint body side, a tip side near the large diameter portion is a first small diameter portion having a smaller diameter than the large diameter portion, and a side farther from the large diameter portion is the side. The second small-diameter portion having a smaller diameter than the first small-diameter portion, the locking ring is provided on the first small-diameter portion, and the seal ring is provided on the second small-diameter portion. It is preferable that
The locking ring has the inner ring portion fitted in a groove formed on the base, and an inner wall of the pressing ring and an outer surface of the base between the inner ring portion and the claw portion. It is preferable to be sandwiched between the two.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a pipe joint according to the invention will be described in detail with reference to the accompanying drawings.
FIG. 1A is a cross-sectional view of the pipe joint according to the present embodiment, and shows a state when the pipe joint is connected in the connection hole (a part of the fluid flow path) 14 a of the external fluid device 14. The connection hole 14a is formed with a large diameter on the opening end side.
A conventionally known structure can be adopted as the pipe connection structure of the pipe joint.
That is, 12 is a pipe-shaped joint body, 20 is a guide cylinder whose one end is press-fitted and fixed in the joint body 12, and 26 is a stopper fixed in the guide cylinder 20 by caulking one end of the guide cylinder 20. , 18 is an open cylinder held in one end of the guide cylinder 20 so as to be movable in the axial direction, 28 is a seal ring, and 24 is a lock claw.
[0009]
The pipe to be connected is inserted into the joint main body 12 from the pipe insertion port of the joint main body 12 (the open cylinder 18 and the guide cylinder 26 constitute a pipe insertion port). Thereby, the lock claw 24 is spread outward by the tip of the tube, and the tip is placed on the outer peripheral surface of the tube. When the tube is pulled in the removal direction in this state, the tip of the lock claw 24 bites into the outer wall of the tube, and the removal is prevented. When the tube is pulled out, the open cylinder 18 is pushed in to release the lock pawl 24 from biting into the outer wall of the tube. The stopper 26 prevents excessive deformation of the lock claw 24.
[0010]
Next, the attachment structure to the external fluid apparatus 14 of the pipe joint 10 is demonstrated.
The connection hole 14a is not a screw hole but a straight hole. Therefore, the connection hole 14a can be easily formed. The connection hole 14a may be a screw hole.
[0011]
Reference numeral 16 denotes a tubular base, which is formed on the other end side of the joint body 12, and the other end side of the fluid flow path of the joint body 12 is opened. The base body 16 has a joint body 12 side at the large diameter portion 17, a distal end side close to the large diameter portion 17 at the first small diameter portion 19 having a smaller diameter than the large diameter portion 17, and a portion far from the large diameter portion 17. It is formed in the second small diameter portion 21 having a smaller diameter than the small diameter portion 19 and can enter the connection hole 14a. The outer diameter of the large diameter portion 17 is substantially the same as the inner diameter of the connection hole 14a. Reference numeral 23 denotes a step surface between the joint body 12 and the large-diameter portion 17, and reference numeral 25 denotes a step surface between the first small-diameter portion 19 and the second small-diameter portion 21.
Reference numeral 42 denotes a circumferential groove formed in the first small diameter portion 19.
[0012]
Reference numeral 30 denotes a locking ring formed in a ring shape using an elastic material (for example, a thin metal flat plate).
FIG. 2 is a partial plan view of the locking ring 30, and FIG. 3 is a partial cross-sectional view of the locking ring 30.
As shown in FIG. 2, the locking ring 30 is formed by alternately forming a plurality of radial outer cut portions 32 and inner cut portions 34 from the outer edge and the inner edge. A divided outer ring portion 36, an inner ring portion 38 divided between the outer ring portions 36 adjacent to each other, and an outer ring portion facing one end and the other end of the inner ring portion 38 A zigzag ring formed in the connecting portion 40 connected to the end portion of 36 is formed.
In addition, although the outer notch 32 of the locking ring 30 of this Embodiment is formed in the shape which makes V shape, you may form in the shape which makes U shape, without limiting to this.
[0013]
Further, as shown in FIG. 3, the locking ring 30 has a required position P from the outer end edge X (substantially central part of the connecting portion 40) and a required position Q from the inner end edge Y (inner ring portion 38). Are substantially bent in opposite directions by press work so that both ∠XPQ and ∠PQY have an obtuse angle. The outer ring portion 36 and the inner ring portion 38 are made substantially parallel.
Therefore, the connecting portion between the bending position P and the bending position Q is formed in the inclined piece portion 43 that gradually spreads obliquely outward from the inner ring portion 38.
[0014]
Since the locking ring 30 is formed as described above, and the inner ring portion 38 is easily bent, the second small-diameter portion 21 of the base 16 is expanded by widening the inner edge side of the inner ring portion 38. The locking ring 30 inserted from the side can be easily inserted over the step surface 25 to the first small diameter portion 19 side, and can be fitted into the groove 42 (FIG. 1B).
[0015]
In FIG. 1A, reference numeral 50 denotes a pressing ring formed in a substantially ring shape, and has an outer diameter substantially the same as the inner diameter of the connection hole 14a. The pressing ring 50 is inserted from the front end side of the base body 16 onto the first small diameter portion 19 of the base body 16 until the bottom portion 50a contacts the stepped surface 25. Thus, the inclined piece 43 is pressed and sandwiched between the pressing ring 50 and the outer surface of the first small diameter portion 19.
In this way, when the inclined piece 43 is pressed and clamped between the inner wall of the pressing ring 50 and the outer surface of the first small diameter portion 19, the locking ring 30 has a portion outside the bent portion 40a. While maintaining parallel to the inner ring portion 38, the base 16 is set to open rearward and outward in the insertion direction of the base 16 into the connection hole 14a. This outwardly opened portion becomes the claw portion 45, and bites into the inner wall of the connection hole 14a when the pipe joint 10 is mounted in the connection hole 14a. Thus, the locking ring 30 is fixed on the first small diameter portion 19 with the inner ring portion 38 fitted in the groove 42.
[0016]
A seal ring 52 is formed in a ring shape using an elastic material such as synthetic rubber, and is held on the small diameter portion 19.
In the above embodiment, the attachment portion 60 is configured by the base body 16, the locking ring 30, the pressing ring 50, the seal ring 52, and the like.
[0017]
Next, a method for attaching the pipe joint 10 to the connection hole 14a will be described with reference to FIG.
The joint body 12 is pushed in by hand, and the base body 16 is sufficiently advanced into the connection hole 14a until the stepped surface 23 comes into contact with the wall surface 14b of the fluid device 14. At that time, the claw portion 45 is pressed inward by the inner wall of the connection hole 14a to be reduced in diameter so that it can easily enter the connection hole 14a while abutting against the inner wall of the connection hole 14a.
In this state, when pressure fluid is allowed to flow through the flow path of the fluid device 14, fluid pressure acts on the end face of the base body 16, so that the mounting portion 60 is pressured toward the open end of the connection hole 14 a (upward in the drawing). Receive. However, at that time, the claw portion 45 bites into the inner wall of the connection hole 14a, so that the removal prevention is achieved.
In addition, a pressing force is applied to the locking ring 30 when a pressure fluid flows in the flow path of the fluid device 14, but the applied pressing force is distributed to the connecting portions 40 and 40, thereby avoiding stress concentration. It can withstand repeated stresses, and the breaking of the locking ring 30 can be minimized.
[0018]
The above description is an example of a preferred embodiment according to the present invention, and the present invention is not limited to this. Of course, more modifications can be made without departing from the spirit of the invention. It is.
[0019]
For example, the pipe joint 10 of the above embodiment is formed in a straight shape as a whole by connecting the base body 16 and the open cylinder 18 in a straight shape, but the present invention is limited to this. is not.
That is, as shown in FIG. 4, the pipe joint 10 may be formed in an L shape by connecting the base body 16 and the open cylinder 18 in an L shape.
[0020]
【The invention's effect】
According to the pipe joint according to the present invention, a fluid flow path is formed, and one end side where the fluid flow path opens is formed in the pipe insertion opening, and is located inward of the pipe insertion opening and inserted from the pipe insertion opening. A joint body provided with a lock claw that bites into the outer wall of the pipe to prevent the pipe from being pulled out, and formed at the other end side of the joint body, the other end side of the fluid flow path is opened, and an external fluid device In a pipe joint comprising an attachment portion for attaching the joint body to the connection hole of
The attachment portion is formed on the other end side of the joint body, and the other end side of the fluid flow path is open, and is formed in a ring shape using a tubular base body that can enter the connection hole and an elastic material. A zigzag ring shape in which a plurality of radially outer cut portions and inner cut portions are alternately formed from the outer edge and the inner edge, and the outer ring portion and the inner ring portion are connected by a connecting portion. None, a portion extending from the outer edge side to a certain width is bent and formed in the claw portion so as to spread backward and outward with respect to the insertion direction of the base into the connection hole. A locking ring that is mounted and capable of biting into the inner wall of the connection hole, and a pressing ring that is provided on the base and fixes the locking ring on the base, and is provided on the base. A seal ring Therefore, it can be attached to the one-touch on the external fluid apparatus, moreover can achieve a reduction in size and manufacturing cost of the entire product.
[Brief description of the drawings]
FIG. 1A is a front sectional view showing a cross section of a pipe joint according to the present embodiment, and FIG. It is sectional drawing.
FIG. 2 is a partial plan view of a locking ring.
FIG. 3 is a partial cross-sectional view of a locking ring.
FIG. 4 is a front sectional view showing another example of the pipe joint according to the present invention.
FIG. 5 is a cross-sectional view showing a conventional example of a pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Base | substrate 14 Fluid equipment 14a Connection hole 14b Wall surface 16 Base | substrate 17 Large diameter part 19 1st small diameter part 21 2nd small diameter part 18 Open cylinder 20 Guide cylinder 24 Lock claw 26 Stopper 28 Seal ring 30 Locking Ring 32 Outer cut portion 34 Inner cut portion 36 Outer ring portion 38 Inner ring portion 40 Connection portion 42 Groove 42a First side wall 42b Second side wall 42c Bottom wall 43 Inclined piece 45 Claw portion 50 Press ring 52 Seal ring 60 Attachment Part

Claims (3)

A fluid flow path is formed, and one end side where the fluid flow path opens is formed in the tube insertion port, and is located inward of the tube insertion port and bites into the outer wall of the tube inserted from the tube insertion port. A joint body provided with a lock claw for preventing removal, and formed on the other end side of the joint body, the other end side of the fluid flow path is opened, and the joint body is attached to a connection hole of an external fluid device In a pipe joint comprising
The mounting portion is
A tubular base body formed on the other end side of the joint body, the other end side of the fluid flow path being open, and capable of entering the connection hole;
It is formed in a ring shape using an elastic material, and a plurality of radial outer cut portions and inner cut portions are alternately formed from the outer edge and the inner edge, and the outer ring portion and the inner ring portion are formed. A zigzag ring shape connected by a connecting portion is formed, and a portion extending from the outer edge side to a certain width is bent so as to spread rearward and outward in the insertion direction of the base body into the connection hole. A locking ring formed on the claw portion and mounted on the base body, the outer end edge being able to bite into the connection hole inner wall;
A pressing ring provided on the base and fixing the locking ring on the base;
A pipe joint comprising a seal ring provided on the base. The base body side is the large-diameter portion on the joint body side, the tip side and the side close to the large-diameter portion are the first small-diameter portion having a smaller diameter than the large-diameter portion, and the side far from the large-diameter portion is the first Formed in the second small diameter portion having a smaller diameter than the small diameter portion of
The locking ring is provided on the first small diameter portion,
The pipe joint according to claim 1, wherein the seal ring is provided on the second small diameter portion. In the locking ring, the inner ring portion is fitted in a groove formed on the base, and the space between the inner ring portion and the claw portion is between the inner wall of the pressing ring and the outer surface of the base. 3. The pipe joint according to claim 1 or 2, wherein the pipe joint is pressed and clamped by.

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