JPH0554891U - Pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pipe joint that does not inadvertently separate even when a high-pressure fluid acts. A cylindrical female member having a circumferential groove on its inner circumferential surface and having a tapered surface in which a part of a wall forming the circumferential groove is reduced toward the male member insertion port, and is inserted into the male member insertion port. A cylindrical male member having a hard shaft portion having a peripheral groove on the outer peripheral surface of the shaft portion, and an inner peripheral diameter in the natural state which is slightly smaller than the outer diameter of the shaft portion of the male member, and the female member When the fluid pressure acts in a state in which the shaft portion of the male member is inserted into the elastic ring body through the male member insertion opening, the elastic ring body accommodated in the circumferential groove of the elastic ring body, With the inner peripheral portion of the elastic ring body inserted in the peripheral groove of the male member, the elastic ring body is pressed by the tapered surface to be reduced in diameter.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a pipe joint of a type in which an elastic ring body mounted in a female member is expanded and contracted to lock and release a male member and the like inserted in the elastic ring body.

[0002]

[Prior Art]

 An example of this type of pipe joint is shown in FIG. As shown in the same figure, in this structure, a tapered surface 80 is formed on the inner peripheral surface of the joint main body 8 and a collet 9 which can be expanded and contracted is provided inside the tapered surface 80. The hose H inserted in the collet 9 can be connected / disconnected by contacting / separating with the tapered surface 80.

As shown in the figure, the collet 9 has a cylindrical shape with both ends open, and has a plurality of slits 90 which are open at the insertion side end so that the diameter can be expanded and contracted. In order to expand and contract the insertion side end of the portion between the slits 90 in the collet 9, there is provided an outer protruding portion 91 which projects outward toward the insertion end and is brought into engagement with the tapered surface 80. A locking claw 92 protruding inward is formed in order to secure the locking to the hose H more securely.

Therefore, in the above pipe joint, when the fluid pressure acts in the state where the hose H is inserted in the collet 9 (when the force in the direction in which the hose H pops out from the pipe joint acts), the movement of the collet 9 is moved. As a result, the diameter of the insertion side end is reduced, whereby the locking claw 92 bites into the hose H, and the hose H is prevented from coming off. When a pipe fitting of the above type is used for high-pressure fluid, for example, a configuration in which a hard pipe is directly inserted or a hard (metal or hard synthetic resin) male member is inserted in a female member is considered. However, in the case of such a configuration, since the locking claw 92 does not cut into the outer surface of the pipe or the male member, there is a possibility that the pipe or the male member may come off at the same time when pressure is applied, Very dangerous.

[0005]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a pipe joint that does not inadvertently separate even when a high-pressure fluid acts.

[0006]

[Means for Solving the Problems]

 A pipe joint according to a first aspect of the present invention is a tubular female member having a circumferential groove on an inner circumferential surface thereof and a part of a wall forming the circumferential groove being a tapered surface having a diameter reduced toward a male member insertion port. A cylindrical male member having a hard shaft portion to be inserted into the male member insertion port and having a circumferential groove on an outer peripheral surface of the shaft portion; and an inner peripheral diameter of the male member outside the shaft portion of the male member in a natural state. A state in which an elastic ring body having a diameter slightly smaller than the diameter and accommodated in the circumferential groove of the female member and capable of expanding and contracting is provided, and the shaft portion of the male member is inserted into the elastic ring body through the male member insertion port. When the fluid pressure is applied, the elastic ring body is pressed by the tapered surface to be reduced in diameter while the inner peripheral portion of the elastic ring body is inserted into the circumferential groove of the male member.

A pipe joint according to a second aspect of the present invention is a tubular female member having a circumferential groove on an inner circumferential surface thereof and a part of a wall forming the circumferential groove being a tapered surface having a diameter reduced toward a piping member insertion port. A hard pipe member having a peripheral groove near the outer periphery of the tip inserted into the male member insertion port, and an inner peripheral diameter in the natural state which is slightly smaller than an outer diameter of the hard pipe member and a peripheral groove of the female member. An elastic ring body capable of expanding and contracting the diameter accommodated therein, and the elastic ring body when the fluid pressure acts in a state where the end of the hard pipe member is inserted into the elastic ring body through the male member insertion port. The elastic ring body is pressed by the taper surface to be reduced in diameter while the inner peripheral portion of the elastic ring body is inserted into the peripheral groove of the hard pipe member.

A pipe joint according to a third aspect of the present invention is a tubular female member having a peripheral groove on an inner peripheral surface thereof and a recessed portion at a male member insertion port side portion of the peripheral groove forming wall; and the male member inserting member. A cylindrical male member that has a hard shaft portion that is inserted into the mouth and that has a peripheral groove on the outer peripheral surface of the shaft portion, and an inner diameter in the natural state that is slightly smaller than the outer diameter of the shaft portion of the male member. And an elastic ring body which is accommodated in the circumferential groove of the female member and which can be expanded and contracted, and a fluid pressure acts in a state where the shaft portion of the male member is inserted into the elastic ring body through the male member insertion port. At this time, the recessed portion forming wall and the circumferential groove forming wall of the shaft portion are brought into a locked state via the elastic ring body.

According to a fourth aspect of the present invention, there is provided a pipe joint, which has a peripheral groove on an inner peripheral surface thereof, and a pipe member having a concave portion at a pipe member insertion port side portion of the peripheral groove forming wall, and is inserted into the pipe member insertion port. A rigid pipe member having a peripheral groove near the outer periphery of the tip, and an elastic body whose inner diameter is slightly smaller than the outer diameter of the hard pipe member in the natural state and which can be expanded and contracted in the peripheral groove of the female member. A ring body, and when the fluid pressure acts in a state in which the end of the hard pipe member is inserted into the elastic ring body through the male member insertion port, the above-mentioned recessed portion structure is formed through the elastic ring body. The wall and the circumferential groove forming wall of the shaft portion are locked.

[0010]

[Action]

 This device has the following effects. (Operation of the invention according to claim 1) When fluid pressure is applied in a state where the shaft portion of the male member is inserted into the elastic ring body through the male member insertion port, the inner peripheral portion of the elastic ring body moves around the shaft portion. Since the elastic ring body is pressed against the taper surface of the female member in the state of being inserted into the groove to reduce the diameter of the elastic ring body, the elastic ring body is used to interpose the shaft portion of the male member and the inner peripheral wall of the female member. Will be locked and coupled by a strong force, and as a result, the male member and the female member will not be inadvertently separated even when a high fluid pressure is applied. (Operation of the invention according to claim 2) When fluid pressure acts in a state in which the end of the hard pipe member is inserted into the elastic ring body through the pipe member insertion port, the inner peripheral portion of the elastic ring body moves to the shaft portion. Since the elastic ring body is pressed against the tapered surface of the female member while being inserted in the circumferential groove to reduce the diameter of the elastic ring body, the elastic ring body is contracted through the elastic ring body so The peripheral wall is locked and coupled with a strong force, and as a result, the male member and the female member are not inadvertently separated even when a high fluid pressure is applied. (Operation of the device according to claim 3) When fluid pressure acts in a state in which the shaft portion of the male member is inserted into the elastic ring body through the male member insertion port, the recessed portion forming wall and the recess portion forming wall are formed through the elastic ring body. Since the peripheral groove forming wall of the shaft portion is locked, the male member and the female member are not inadvertently separated even when a high fluid pressure is applied. (Operation of the device according to claim 4) When fluid pressure acts when the end of the hard pipe member is inserted into the elastic ring body through the male member insertion port, the recess forming wall is formed through the elastic ring body. Therefore, the hard pipe member and the female member are not inadvertently separated from each other even if a high fluid pressure is applied, because the wall of the shaft portion and the peripheral groove forming wall of the shaft portion are locked.

[0011]

【Example】

 The configuration of the present invention will be described below with reference to the drawings shown as examples. As shown in FIG. 1 and FIG. 2, the pipe joint of this embodiment is inserted into a female member A having an elastic ring body 4 capable of expanding and contracting inside and a male member insertion opening a of the female member A. 4 and 6, the shaft portion b of the male member B is gripped and opened by the expansion / contraction diameter of the elastic ring body 4, and It connects and separates the male and female members A and B from each other.

As shown in FIGS. 1 and 2, the female member A is composed of a female main body 1, an O-ring 2, a backup ring 3, an elastic ring body 4, and a holder 5. As shown in FIG. 1, the female main body 1 has a cylindrical shape having a small diameter hole portion 1a, a medium diameter hole portion 1b and a large diameter hole portion 1c, and corresponds to the small diameter hole portion 1a as shown in FIG. The cylindrical body 10 is caulked to the outer peripheral side portion.

As shown in FIGS. 1 and 2, the large-diameter hole portion 1c is provided with a peripheral groove 6 on its inner peripheral surface, and a portion of the short cylinder 51 whose opening side is more than the peripheral groove 6 will be described later. The diameter is expanded by the wall thickness (this expanded portion is called the short cylinder housing part). Then, as shown in FIG. 2, the circumferential groove 6 has a taper surface 60 that reduces in diameter toward the opening side of the large-diameter hole portion 1c, a vertical surface 61 that is deeper than the taper surface 60, and the taper surface. The bottom surface 62 connects the surface 60 and the vertical surface 61.

As shown in FIG. 2, the medium-diameter hole portion 1b is provided with an O-ring mounting portion 11 for accommodating the O-ring 2 and the backup ring 3 on its inner peripheral surface. As shown in FIG. 1, the elastic ring body 4 is composed of a C-shaped ring having a circular cross section, and its inner diameter in a natural state is substantially the same as the outer diameter of a circumferential groove 72 (described later) on the male member B side. It is set to do. Then, as shown in FIG. 2, the elastic ring body 4 is mounted in the female member B in such a manner that it is inserted into the circumferential groove 6 described above.

As shown in FIGS. 1 and 2, the holder 5 has a long cylindrical body 50 slidably inserted into the female main body 1 and the elastic ring body 4 in the circumferential groove 6 if the diameter thereof is expanded. It is composed of a short tube 51 for tightening. As shown in FIGS. 1 and 2, the long tubular body 50 has a small-diameter hole portion 5a and a large-diameter hole portion 5b, and the large-diameter hole portion 5b is substantially the same as the outer diameter of the female main body 1. The diameter of the small-diameter hole 5a is substantially the same as the diameter of the large-diameter hole 1c on the inner side of the circumferential groove 6 in the large-diameter hole 1c. In this embodiment, by the engagement of the projection 52 which is projected inward at the open portion of the large diameter hole portion 5b of the long tubular body 50 and the stepped portion 13 formed on the outer peripheral surface of the female main body 1, The long tubular body 50 is in a state of being prevented from being pulled out from the female main body 1.

As shown in FIGS. 1 and 2, the short cylinder 51 is provided at one end thereof with a tapered surface 53 that expands in diameter from the inner surface toward the outer surface. As shown in FIG. 6, the elastic ring body 4 fitted in the circumferential groove 72 of the male member B can be easily expanded in diameter. On the other hand, the male member B includes, as shown in FIG. 1, a pipe connecting portion 70, a tool corresponding portion 71, and a hard shaft portion b inserted into the male member insertion opening a of the female member A as described above. Have As shown in the figure, the shaft portion b has a small diameter portion 73 formed slightly smaller than the medium diameter hole portion 1b, and a large diameter portion 74 formed slightly smaller than the large diameter hole portion 1c. The taper portion 75 connects the large diameter portion 74 and the small diameter portion 73. As shown in FIG. 2, the large-diameter portion 74 is formed with a circumferential groove 72 having a substantially arcuate cross-section with a diameter slightly larger than the wire diameter of the elastic ring body 4, and its depth is It is set to about 1/3 of the wire diameter of the elastic ring body 4.

Since the pipe joint of this embodiment is configured as described above, it can be connected and disconnected in the following manner. ． First, a pipe is threadedly connected to the pipe connecting portion 70 of the male member B, while a pressure resistant tube is caulked between the female main body 1 and the cylindrical body 10, and then the shaft portion b of the male member B is connected to the female member. Insert into the male member insertion hole a of A. Then, as the male member B is inserted, as shown in FIG. 3, the elastic ring body 4 is expanded along the outer circumferences of the tapered portion 75 and the large diameter portion 74 of the shaft portion b. Then, when the male member B is further pushed in from the above state, as shown in FIG. 4, the inner peripheral portion of the elastic ring body 4 is inserted into the peripheral groove 72 formed in the shaft portion b. ． When the fluid pressure is applied from the above state, the male member B is moved in the direction of jumping out from the female member A, and the elastic ring body 4 is brought into a pressure contact state with the tapered surface 60, as shown in FIG. Then, the elastic ring body 4 is contracted by the pressing force from the taper surface 60, and the shaft portion b is gripped with a strong force, so that the high pressure fluid does not inadvertently separate. ． Next, in order to make the male member B and the female member A separable from each other, once the fluid pressure is released, the male member B is once pushed into the female member A as shown in FIG. The taper surface 60 and the elastic ring body 4 are brought into non-contact with each other to release the reducing force from the tapered surface 60 to the elastic ring body 4. When the long cylindrical body 50 is pushed in from this state, the elastic ring body 4 is expanded through the short cylinder 51 and the inner peripheral portion of the elastic ring body 4 is separated from the peripheral groove 72 of the shaft portion b. Become. ． In this state, when the male member B is pulled with respect to the female member A, these can be separated from each other.

As can be seen from the above, in this pipe joint, the male member B and the female member A cannot be separated unless the pushing operation of the male member B and the pushing operation of the holding tool 5 are performed thereafter. The possibility of inadvertent separation due to erroneous operation is reduced, and accidents caused by mischief of a person who does not know the separation method (for example, an outsider) can be prevented. On the other hand, in the above embodiment, a part of the wall of the peripheral groove 6 is formed as the tapered surface 60, but as shown in FIG. 7, the wall of the peripheral groove 6 may be provided with a recess 69. In this case, since the constituent wall of the recess 69 and the peripheral groove 72 of the shaft portion b (insertion portion) are engaged with each other through the elastic ring body 4, even if a high fluid pressure is applied, it does not occur. The male member and female member do not separate easily.

The holder 5 described above is not limited to the shape of this embodiment as long as it holds the elastic ring body 4 in the expanded state. Further, the above-mentioned male member may be one in which a peripheral groove 72 is formed in the vicinity of the end of the hard pipe member. In this case, the end of the pipe member is connected to the pipe member insertion port (corresponding to the male member insertion port). ) May be inserted and connected.

Further, instead of the elastic ring body of the above-mentioned embodiment, an elastic ring body formed by forming a coil spring having a small coil diameter in a circular shape can be adopted.

[0021]

[Effect of the device]

 Since the present invention has the configuration as described above, it has the following effects. As described in the column of action, it was possible to provide a collet type pipe joint that does not inadvertently separate even when a high pressure fluid acts.

[Brief description of drawings]

FIG. 1 is an exploded sectional perspective view of a pipe joint according to an embodiment of the present invention.

FIG. 2 is a sectional view of a female member and a male member of the pipe joint.

FIG. 3 is a cross-sectional view showing a state where a male member of the pipe joint is inserted into a female member.

FIG. 4 is a sectional view showing a state where the male member of the pipe joint is further pushed in from the state of FIG.

FIG. 5 is a cross-sectional view showing a connected state of the pipe joint.

FIG. 6 is a cross-sectional view when the holder for the pipe joint is pushed in.

FIG. 7 is a sectional view of a circumferential groove of a female member according to another embodiment.

FIG. 8 is a cross-sectional view of a conventional collet type pipe joint.

[Explanation of symbols]

 A Female member B Male member a Female member insertion port b Shaft portion 4 Elastic ring body 6 Circumferential groove 60 Tapered surface 69 Recessed portion 72 Circumferential groove

Claims (7)

[Scope of utility model registration request] 1. A tubular female member having a circumferential groove on an inner circumferential surface thereof, wherein a part of a wall of the circumferential groove is tapered toward a male member insertion port, and the male member insertion port. A cylindrical male member having a hard shaft portion to be inserted and having a circumferential groove on the outer peripheral surface of the shaft portion, and an inner peripheral diameter in a natural state is slightly smaller than an outer diameter of the shaft portion of the male member, and An elastic ring body that can be expanded and contracted and is housed in the circumferential groove of the female member,
When the fluid pressure acts in a state where the shaft portion of the male member is inserted in the elastic ring body through the male member insertion port, the inner peripheral portion of the elastic ring body is inserted in the circumferential groove of the male member. A pipe joint characterized in that the elastic ring body is pressed by a tapered surface to be reduced in diameter. 2. A tubular female member having a circumferential groove on its inner circumferential surface and having a tapered surface with a part of the wall constituting the circumferential groove reduced toward the piping member insertion port, and the male member insertion port. A rigid pipe member having a peripheral groove near the outer peripheral portion of the tip to be inserted, and an elastic material whose inner peripheral diameter is slightly smaller than the outer diameter of the hard pipe member in a natural state and which is accommodated in the peripheral groove of the female member and which can be expanded and contracted A ring body, and when the fluid pressure acts in a state where the end of the hard pipe member is inserted into the elastic ring body through the male member insertion port, the inner peripheral portion of the elastic ring body is the hard pipe member. A pipe joint, wherein the elastic ring body is pressed by a tapered surface to be reduced in diameter while being inserted in the circumferential groove. 3. A cylindrical female member having a circumferential groove on the inner circumferential surface thereof and having a recessed portion at the male member insertion port side portion of the circumferential groove forming wall, and a hard shaft inserted into the male member insertion port. A cylindrical male member having a portion and having a circumferential groove on the outer peripheral surface of the shaft portion,
In a natural state, an elastic ring body having an inner peripheral diameter slightly smaller than the outer diameter of the shaft portion of the male member and accommodated in the peripheral groove of the female member and capable of expanding and contracting in diameter is provided through the male member insertion port. When the fluid pressure acts in a state where the shaft portion of the male member is inserted in the elastic ring body, the recess forming wall and the circumferential groove forming wall of the shaft portion are brought into a locked state via the elastic ring body. A pipe joint characterized in that 4. A pipe member having a peripheral groove on an inner peripheral surface thereof and having a recessed portion at a pipe member insertion port side portion of the peripheral groove forming wall, and a peripheral member in the vicinity of a tip outer peripheral portion inserted into the pipe member insertion port. A hard pipe member having a groove; and an elastic ring body having an inner diameter slightly smaller than the outer diameter of the hard pipe member in a natural state and accommodated in a peripheral groove of the female member, the elastic ring member being expandable and contractable. When a fluid pressure is applied to the elastic ring body through the member insertion port while the end of the hard pipe member is inserted, the recessed portion forming wall and the circumferential groove forming wall of the shaft portion are formed through the elastic ring body. A pipe joint characterized in that and are in a locked state. 5. The pipe joint according to claim 1, wherein the circumferential groove of the hard pipe member has a substantially R-shaped cross section, and the elastic ring body has a circular cross-sectional shape. 6. The pipe joint according to claim 5, wherein the elastic ring body is formed in a C shape. 7. The pipe joint according to claim 5, wherein the elastic ring body is formed by forming a coil spring having a small coil diameter in a circular shape.