CN115711329A - Pipe joint and method of mounting the same - Google Patents
Pipe joint and method of mounting the same Download PDFInfo
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- CN115711329A CN115711329A CN202210926313.4A CN202210926313A CN115711329A CN 115711329 A CN115711329 A CN 115711329A CN 202210926313 A CN202210926313 A CN 202210926313A CN 115711329 A CN115711329 A CN 115711329A
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- Prior art keywords
- pipe joint
- locking groove
- adapter
- ring
- female member
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 31
- 238000003780 insertion Methods 0.000 claims description 10
- 230000037431 insertion Effects 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims 3
- 238000010168 coupling process Methods 0.000 claims 3
- 238000005859 coupling reaction Methods 0.000 claims 3
- 239000012530 fluid Substances 0.000 abstract description 24
- 230000004048 modification Effects 0.000 description 24
- 238000012986 modification Methods 0.000 description 24
- 239000000463 material Substances 0.000 description 9
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910001369 Brass Inorganic materials 0.000 description 3
- 229920000459 Nitrile rubber Polymers 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 2
- 229920000299 Nylon 12 Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
The invention provides a pipe joint with high durability and a mounting method thereof, which can prevent a male member from falling off from a female member even when the female member and the male member are repeatedly relatively rotated due to vibration and the like under the state that fluid pressure is acted. The pipe joint includes: a cylindrical adapter (2) which holds a C-shaped ring (7) capable of expanding and contracting in a first locking groove (5) formed on the inner peripheral surface; and a main body (3) which is cylindrical and has a second locking groove (15) formed in the outer peripheral surface thereof, wherein the main body (3) is connected to the adapter (2) via the C-shaped ring (7) by inserting the main body (3) while pushing open the C-shaped ring (7), the C-shaped ring (7) is formed of a circular ring which is partially cut and has a rectangular longitudinal section, and a first tapered surface (5 a) which is reduced in diameter in the direction of opening of the adapter (2) is provided at the opening side portion of the adapter (2) of the first locking groove (5). In addition, the main body (3) is connected to the adapter (2) after the adapter (2) is attached to the device.
Description
Technical Field
The invention relates to a pipe joint and an installation method thereof.
Background
The pipe joint includes a female member (adapter) and a male member (body) connected to each other by a diameter-expandable elastic ring member. Such a pipe joint is used for easily connecting one pipe to another pipe by one-touch operation in automobiles including commercial vehicles (trucks, buses, and the like), construction machines, machine tools, and the like, and various proposals have been made so far regarding such a pipe joint (for example, see patent documents 1, 2, and the like).
Patent document 1 discloses a pipe joint in which a female member and a male member of the pipe joint are connected by an elastic ring member, and the connection between the female member and the male member is not easily released by accident even when a high-pressure fluid is applied.
Further, patent document 2 discloses a pipe joint in which a female member and a male member cannot be separated from each other once they are connected. Specifically, when the fluid pressure acts, a force in the direction opposite to the insertion direction (the direction in which the male member is drawn out) is applied to the male member due to the rise in pressure, and the pipe joint is configured such that the female member and the male member cannot be separated from each other by the elastic ring member entering the groove of the female member.
Here, fig. 16 and 17A to 17C show an example of a conventional pipe joint. Fig. 16 is a longitudinal half sectional view of a conventional pipe joint, and fig. 17A to 17C are enlarged views of a portion D of fig. 16, showing changes in the operation of an elastic ring member when fluid pressure acts on the conventional pipe joint shown in fig. 16.
The illustrated pipe joint 101 includes a female member 102 and a male member 103 connected to each other. A first locking groove 105 having a rectangular vertical cross section is formed along the entire circumference on the inner circumferential surface of the female member 102, and an expandable and contractible elastic ring member 107 having a part cut off is held in the first locking groove 105. On the other hand, a second locking groove 115 is formed on the outer peripheral surface of the male member 103, and if the male member 103 is inserted into the female member 102 from above, for example, the elastic ring member 107 held in the first locking groove 105 of the female member 102 is pushed open by the male member 103, thereby allowing the male member 103 to be inserted into the female member 102.
Further, as shown in fig. 17A, when the second locking groove 115 of the male member 103 and the first locking groove 105 of the female member 102 coincide with each other, as shown by the chain line in fig. 17A, the elastic ring member 107 having the expanded diameter is reduced in diameter as shown by the solid line by the elastic restoring force thereof, and is fitted into the second locking groove 115 of the male member 103 and locked, and therefore, the female member 102 and the male member 103 are connected to each other by the elastic ring member 107. Therefore, even if fluid pressure acts on the pipe joint 101, the male member 103 can be prevented from coming off the female member 102.
Documents of the prior art
Patent literature
Patent document 1: japanese patent laid-open No. Hei 5-054891
Patent document 2: japanese patent laid-open No. 2008-180366
Disclosure of Invention
Problems to be solved by the invention
However, when the relative rotation between the female member 102 and the male member 103 is repeated by, for example, vibration or the like in a state where the fluid pressure acts on the conventional pipe joint 101 shown in fig. 16, the contact portion between the corner of the elastic ring member 107 and the second locking groove 115 of the male member 103 is cut off to form a tapered surface as shown in fig. 17B, and the two are brought into surface contact by the tapered surface. At this time, when the male member 103 is acted on by the fluid pressure in an upward direction in the drawing (a force in a direction of pulling out the male member 103), as shown in fig. 17B, a force f in a vertical direction is exerted on the contact surface of the elastic ring member 107 and the second locking groove 115 in a tapered shape 1 Therefore, the elastic ring member 107 is subjected to the force f 1 Horizontal component force f 11 And expands (expands in the direction of the arrow shown). Therefore, as shown in fig. 17C, the locked state between the elastic ring member 107 and the second locking groove 115 of the male member 103 is released, and the male member 103 comes off upward in the drawing.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly durable pipe joint and a method of mounting the pipe joint, which can prevent a male member from coming off a female member even if the female member and the male member are repeatedly rotated relative to each other by vibration or the like in a state where fluid pressure is applied.
Means for solving the problems
In order to achieve the above object, a pipe joint of the present invention comprises: a cylindrical female member having a diameter-expandable elastic ring member held in a first locking groove formed in an inner peripheral surface thereof; and a male member having a cylindrical shape with a second locking groove formed in an outer peripheral surface thereof, the male member being connected to the female member via the elastic ring member by inserting the male member while pushing the elastic ring member open, the elastic ring member being formed of a circular ring having a rectangular longitudinal section and a part of which is cut away, wherein a first tapered surface that is reduced in diameter in a direction toward an opening of the female member is provided at an opening side portion of the female member in the first locking groove. In the pipe joint mounting method according to the present invention, the female member is mounted on the equipment, and then the male member is connected to the female member.
Effects of the invention
According to the present invention, the female member and the male member are connected to each other by inserting the male member into the female member and the elastic ring member is locked by both the first locking groove of the female member and the second locking groove of the male member, and when fluid pressure acts on the pipe joint, the corner portion of the elastic ring member engages with the first tapered surface of the first locking groove. The horizontal component of the force (force in the direction perpendicular to the first tapered surface) acting on the engaging portion of the corner portion of the elastic ring member that engages with the first tapered surface reduces the diameter of the elastic ring member, and the inner peripheral surface of the elastic ring member is pushed toward the second locking groove of the male member. As a result, the relative rotation between the female member and the male member due to vibration or the like is less likely to occur in a state where the fluid pressure is applied, and the male member can be prevented from coming off the female member even if the rotation is repeated.
Drawings
Fig. 1 is a vertical half-sectional view showing a state before a female member and a male member are fastened to constitute a pipe joint according to a first embodiment.
Fig. 2 is an enlarged view of a portion a of fig. 1.
Fig. 3 is an enlarged view of a portion B of fig. 1.
FIG. 4 is a top view of a resilient ring member.
Fig. 5 is a vertical half sectional view of the pipe joint, showing a state where the male member is inserted into the female member.
Fig. 6A is an enlarged view of a portion C of fig. 5, showing a fastening procedure of the pipe joint.
Fig. 6B is a view showing steps subsequent to fig. 6A.
Fig. 6C is a view showing steps subsequent to fig. 6B.
Fig. 7 is a longitudinal half-sectional view of the pipe joint, showing a state in which the male member is fastened to the female member.
Fig. 8A is an enlarged cross-sectional view of a main portion showing a change in operation of the elastic ring member when fluid pressure acts on the pipe joint of the present embodiment.
Fig. 8B is a view showing a change in operation of the elastic ring member after fig. 8A.
Fig. 8C is a view showing a change in operation of the elastic ring member after fig. 8B.
Fig. 8D is a view showing a change in operation of the elastic ring member after fig. 8C.
Fig. 9A is a front half sectional view showing another embodiment of the elastic ring member.
Fig. 9B is a front half sectional view showing still another embodiment of the elastic ring member.
Fig. 9C is a front half-sectional view showing still another embodiment of the elastic ring member.
Fig. 9D is a front half-sectional view showing still another embodiment of the elastic ring member.
Fig. 9E is a front half-sectional view showing still another embodiment of the elastic ring member.
Fig. 9F is a front half-sectional view showing still another embodiment of the elastic ring member.
Fig. 10A is a sectional view of a main portion showing a change in operation of the elastic ring member when fluid pressure acts on the pipe joint according to the second embodiment.
Fig. 10B is a view showing a change in operation of the elastic ring member after fig. 10A.
Fig. 11 is a vertical half-sectional view showing a state before the female member and the male member of the pipe joint according to modification 1 of the present invention are fastened to each other.
Fig. 12 is a vertical half-sectional view of the female member of the pipe joint according to modification 2 of the present invention.
Fig. 13 is a vertical half sectional view of a female member of a pipe joint according to modification 3 of the present invention.
Fig. 14 is a longitudinal half-sectional view of a female member of a pipe joint according to modification 4 of the present invention.
Fig. 15 is a vertical half-sectional view of a female member of a pipe joint according to modification 5 of the present invention.
Fig. 16 is a longitudinal half sectional view of a conventional pipe joint.
Fig. 17A is an enlarged view of a portion D of fig. 16, and shows a change in operation of the elastic ring member when fluid pressure acts on the conventional pipe joint.
Fig. 17B is a view showing a change in operation of the elastic ring member after fig. 17A.
Fig. 17C is a view showing a change in operation of the elastic ring member after fig. 17B.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
< first embodiment >
Fig. 1 is a vertical half sectional view showing a state before a female member and a male member constituting a pipe joint according to the present embodiment are fastened to each other, fig. 2 is an enlarged view of a portion a of fig. 1, fig. 3 is an enlarged view of a portion B of fig. 1, and fig. 4 is a plan view of an elastic ring member.
As shown in fig. 1, a pipe joint 1 of the present embodiment includes an adapter 2 as a female member made of metal and a body 3 as a male member made of resin. For example, the adapter 2 is used for connection to equipment, and the body 3 is used for connection to brake piping.
In the present embodiment, the adaptor 2 is made of copper-zinc alloy (C3604) containing lead, and the body 3 is made of polyamide 12 (PA 12) reinforced with Glass Fiber (GF), but these materials are merely examples and are not intended to limit the present invention. The material constituting the adapter 2 may be metal or resin. The metal may be brass, lead-free material such as C6801, aluminum alloy, steel material, or stainless steel material. PPA reinforced with GF may be used as a material constituting the main body 3, but not only resin, but also a forged brass product (C3771), a lead-free brass material, an aluminum alloy, a stainless steel alloy, and the like may be used.
The adapter 2 is a cylindrical member, and a flow path 4 formed by circular holes 2a and 2b having different diameters is formed through the center of the shaft. In the present embodiment, the configuration of the large and small circular holes 2a and 2b having different diameters is shown, but this is merely an example, and circular holes having the same diameter may be used. A nut portion 2A is integrally formed on the outer periphery of the adapter 2 at an intermediate height position in the vertical direction in fig. 1, and a screw portion 2B is engraved on the outer periphery of the lower end portion below the nut portion 2A. The adaptor 2 can be attached to a device by rotating the nut 2A with a tool such as a wrench or spanner, not shown, and screwing the threaded portion 2B into a threaded hole of the device, not shown. In addition, the shape of the threaded portion of the adapter 2 is merely an example, and is not limited thereto. Tapered threads, straight threads and sealing materials, metal seals, etc. are also possible. Alternatively, the screw may be a female screw. In the present embodiment, the structure having the nut portion 2A is shown, but this is merely an example, and the structure may be such that the device can be attached to an apparatus using a hexagonal wrench as a structure having a hexagon socket inside the screw of the adaptor 2. In this case, the nut portion 2A may not have a cylindrical shape, but may have a cylindrical shape on the outer side.
A first locking groove 5 and an annular groove 6 having a rectangular cross section are formed along the entire circumference on the upper and lower sides of the inner circumferential surface of the circular hole 2a on the large diameter side of the adapter 2, a C-ring 7 as an elastic ring member made of resin is fitted and held in the first locking groove 5, and an annular O-ring 8 as a sealing member is fitted in the annular groove 6. As a material constituting the O-ring 8, for example, ethylene Propylene Diene Monomer (EPDM), nitrile Butadiene Rubber (NBR), or Hydrogenated Nitrile Butadiene Rubber (HNBR) can be used. The C-ring 7 is not limited to resin, and may be made of metal.
Here, the first locking groove 5 is formed in the upper portion (upper end opening side of the adapter 2) along the entire circumference in the height direction of the inner circumferential surface of the round hole 2a on the large diameter side of the adapter 2. As shown in detail in fig. 2, a first tapered surface 5a whose diameter decreases toward the opening direction of the adapter 2 is provided at the opening side portion of the adapter 2 of the first locking groove 5. A small inner diameter portion 5b having an inner diameter smaller than that of the first locking groove 5 is provided on the opposite side of the opening direction of the adapter 2, being connected to the first tapered surface 5a. The small inner diameter portion 5b has a surface (vertical surface) parallel to the axial direction (vertical direction in fig. 2) of the adaptor 2. Further, a second tapered surface 5c, which is reduced in diameter in the opening direction of the adapter 2, is provided on the opposite side of the opening direction of the adapter 2, being connected to the small inner diameter portion 5b. Thus, the upper end opening side portion of the adapter 2 is formed with two stages of the first tapered surface 5a and the second tapered surface 5c which are reduced in diameter upward in fig. 2, and the inner peripheral surface connecting the first tapered surface 5a and the second tapered surface 5c constitutes the small inner diameter portion 5b. The bottom surface 5d of the first locking groove 5 at the lower end in fig. 2 is an annular flat surface (horizontal surface) parallel to the direction perpendicular to the axis of the adapter 2 (the left-right direction in fig. 2). The bottom surface 5d and the second tapered surface 5c are connected to each other by a vertical surface 5e parallel to the axial direction of the adapter 2.
As shown in fig. 4, a C-shaped ring 7 made of resin and having a diameter that can be enlarged and reduced, a part of the outer periphery of which is cut off, is fitted and held in a first locking groove 5 formed in the adapter 2. Here, the C-ring 7 is a circular ring having a rectangular vertical cross section, and in a state where the body 3 is not connected to the adaptor 2 (when the C-ring 7 is in an initial state (no-load state)), as shown in fig. 2, the inner peripheral surface thereof protrudes by an amount of ∈ shown in the drawing from the inner peripheral surface of the circular hole 2a on the larger diameter side of the adaptor 2, and a gap δ shown in the drawing is formed between the outer peripheral surface of the C-ring 7 and the vertical surface 5e of the first locking groove 5. In the present embodiment, the C-ring 7 is made of polyamide 12 (PA 12) reinforced with Glass Fiber (GF) of the same material as the body 3, but is not limited thereto.
As shown in fig. 1, the body 3 is a cylindrical member bent in a horizontal L-shape, and includes a vertical portion 3A and a horizontal portion 3B bent at a right angle from an upper end portion of the vertical portion 3A and horizontally and integrally extending, and a seal ring 9, a hook and loop portion 10, a lock ring 11, a lock ring holder 12, and a release ring 13 are provided at an opening side end portion of the horizontal portion 3B. A flow path 14 bent in a horizontal L-shape by circular holes 3a and 3b having different diameters is provided through the body 3. In the present embodiment, the main body 3 is formed of a member bent in a horizontal L shape, but the main body 3 may be formed of a T-shaped or Y-shaped member.
A flange portion 3C is integrally formed at an intermediate height position of the outer periphery of the vertical portion 3A of the body 3, and a portion below the flange portion 3C constitutes an insertion portion 3A1 to be inserted into the adapter 2. A tapered surface 3c, which is reduced in diameter downward, is formed on the outer peripheral edge of the lower end of the insertion portion 3A1. Here, a second locking groove 15 is formed along the entire circumference on the outer circumferential surface of the insertion portion 3A1. As shown in detail in fig. 3, the second locking groove 15 has a tapered surface 15a whose diameter is increased upward at its upper end portion, and a bottom surface 15b at the lower end, which is an end surface on the opening side of the body 3 of the second locking groove 15, is formed as a plane (horizontal surface) perpendicular to the vertical axis of the insertion portion 3A1 of the body 3. The tapered surface 15a and the bottom surface 15b at the lower end of the second locking groove 15 are connected to each other by a vertical surface 15 c.
Next, the connection procedure of the adapter 2 and the body 3 of the pipe joint 1 configured as described above will be described with reference to fig. 5 to 7.
Fig. 5 is a longitudinal half sectional view of the pipe joint 1 showing a state where the body 3 is inserted into the adapter 2, fig. 6A to 6C are enlarged views of a portion C of fig. 5, showing a procedure of fastening the pipe joint in this procedure, and fig. 7 is a longitudinal half sectional view of the pipe joint 1 showing a state where the body 3 is fastened to the adapter 2.
The pipe joint 1 of the present embodiment can be used for an air pipe such as an air brake pipe for a vehicle such as a truck. In the pipe joint 1 of the present embodiment, the adapter 2 is first attached to the equipment using a tool such as a torque driver, so that the pipe joints 1 do not interfere with each other even in the case of a narrow pitch.
As shown in fig. 5, the pipe joint 1 of the present embodiment is used by inserting the insertion portion 3A1 of the body 3 into the vertically fixed adapter 2 of the pipe joint 1 from above.
As described above, when the insertion portion 3A1 of the body 3 is inserted into the adaptor 2 from above, as shown in fig. 6A, the tapered surface 3C formed on the outer periphery of the lower end of the insertion portion 3A1 of the body 3 abuts on the inner periphery of the upper end of the C-shaped ring 7 fitted and held in the first locking groove 5 of the adaptor 2, and the C-shaped ring 7 is pushed open in the direction of the arrow shown in the figure, thereby expanding the diameter of the C-shaped ring 7. Then, as shown in fig. 6B, the C-ring 7 is buried in the first locking groove 5, and the body 3 is allowed to pass (press-fitted).
Then, as shown in fig. 6C, when the second locking groove 15 of the body 3 and the first locking groove 5 of the adapter 2 coincide, the force for expanding the diameter of the C-shaped ring 7 is released, and therefore, the C-shaped ring 7 is reduced in diameter by its own elastic restoring force, returns to its original initial state, and is locked in the second locking groove 15 of the body 3. As a result, as shown in fig. 7, the body 3 is connected to the adaptor 2 via the C-ring 7 by a simple operation of inserting only the body 3 into the adaptor 2 from above. Therefore, for example, in a limited space within the hood of a truck, interference of the plurality of pipe joints 1 with each other can be prevented, and the workability of mounting the pipe joints 1 can be made good.
Next, the operation of the C-ring 7 when the fluid pressure acts on the pipe joint 1 obtained by fastening the adapter 2 and the body 3 through the above steps will be described below with reference to fig. 8A to 8D.
Fig. 8A to 8D are enlarged cross-sectional views of essential parts showing the operation of the C-ring 7 when fluid pressure acts on the pipe joint 1 of the present embodiment. When the fluid pressure is not applied to the pipe joint 1, the C-ring 7 is in the state shown in fig. 6C, but when the fluid pressure is applied to the pipe joint 1, that is, for example, when high-pressure air flows through the flow path 4 of the adapter 2 and the flow path 14 of the body 3, the body 3 receives a force in a direction (upward in fig. 8A to 8D) in which it is pulled out from the adapter 2. Then, as shown in fig. 8A, the body 3 moves upward until the corner of the upper end outer peripheral edge portion of the C-shaped ring 7 engages with the second tapered surface 5C of the first locking groove 5 at the engagement point p. At an engagement point p where the C-shaped ring 7 engages with the second tapered surface 5C of the first engagement groove 5, a force F (a force in a direction perpendicular to the second tapered surface 5C) acting on the C-shaped ring 7 is applied 1 Horizontal component force F 11 So that the C-ring 7 is reduced in diameter.
In addition, the first and second substrates are,the bottom surface 7b of the C-shaped ring 7 is in surface contact with the bottom surface 15b of the second locking groove 15 of the body 3, and an upward vertical resistance N acts on this contact surface. At this time, when the friction coefficient of the contact surface is μ, a frictional force of μ · N acts on the bottom surface 7b of the C-ring 7. Due to the friction force mu.N and the force F acting on the joint p 1 Horizontal component force F 11 Since the pair of forces M (see fig. 8B) in the arrow direction (clockwise direction) act on the C-ring 7 in the same magnitude but in opposite directions, the C-ring 7 is inclined by the pair of forces M at the time when the corner of the C-ring 7 reaches the end of the second tapered surface 5C of the first locking groove 5, as shown in fig. 8B.
When the engagement point p at the corner of the C-shaped ring 7 is disengaged from the second tapered surface 5C of the first locking groove 5, as shown in fig. 8C, the upper end of the C-shaped ring 7 enters the space S formed between the small inner diameter portion 5b of the first locking groove 5 and the vertical surface 15C of the second locking groove 15, and the corner is engaged with the first tapered surface 5a of the first locking groove 5 at the engagement point q. At this time, the width w of the space S formed between the small inner diameter portion 5b of the first locking groove 5 and the vertical surface 15C of the second locking groove 15 is larger than the thickness t of the C-ring 7 (w > t), and the upper end portion of the C-ring 7 enters the space S. Therefore, the C-ring 7 is prevented from falling down by the small inner diameter portion 5b of the first locking groove 5, and the falling down amount is suppressed.
In this state, the C-ring 7 and the body 3 can move upward (in the direction of pulling out the body 3) until the corner of the C-ring 7 engages with the first tapered surface 5a of the first locking groove 5 at the engagement point q as shown in fig. 8C, and further movement, that is, the body 3 is prevented from falling off the adapter 2. At this time, a force F in the vertical direction acts on the first tapered surface 5a at the engagement point q between the corner of the C-shaped ring 7 and the first tapered surface 5a 2 Therefore, the C-ring 7 is forced by the force F 2 Horizontal component force F 21 The inner peripheral surface of the stopper is pressed against the vertical surface 15c of the second locking groove 15 of the body 3. Therefore, the engagement amount (overlap amount) ∈ 2 by which the C-ring 7 engages the bottom surface 15b of the second locking groove 15 is larger than the engagement amount ∈ 1 shown in fig. 8A (∈ 2 > ∈ 1), and the main body 3 is further prevented from coming off the adapter 2. Therefore, even in a state where fluid pressure such as air pressure is applied, the vibration or the like is generatedThe repeated relative rotation between the adapter 2 and the body 3 can prevent the body 3 from coming off the adapter 2, and the durability of the pipe joint 1 against the rotation can be improved.
Further, since relative rotation is repeated between the adapter 2 and the body 3 by vibration or the like in a state where the fluid pressure is applied, even when the corner portion of the C-shaped ring 7 is cut into the tapered surface 7a by sliding friction with the second tapered surface 5C of the first locking groove 5 as shown in fig. 8D, the C-shaped ring 7 is subjected to a force F perpendicular to the first tapered surface 5a of the first locking groove 5 3 Horizontal component force F 31 Pressing in the diameter reducing direction. As a result, since the inner peripheral surface of the C-ring 7 is pressed by the vertical surface 15C of the second locking groove 15, the engagement amount (overlapping amount) ∈ 3 between the C-ring 7 and the second locking groove 15 can be sufficiently ensured, and the body 3 can be prevented from coming off the adapter 2 even in a state where the fluid pressure acts on the pipe joint 1.
Here, fig. 9A to 9F show another form of the C-shaped ring 7, but as shown in fig. 9A, a corner portion of an outer peripheral edge portion of an upper end (one end in the axial direction) of the C-shaped ring 7 may be chamfered, and this portion may be a tapered surface 7C. In this case, since there is a possibility that the C-ring 7 is erroneously assembled upside down when the pipe joint 1 is assembled, both corner portions of the outer peripheral end edges of the upper portion and the lower portion (both end portions in the axial direction) of the C-ring 7 may be chamfered as shown in fig. 9B, and the respective corner portions may be tapered surfaces 7C. As shown in fig. 9C, a tapered surface 7C may be formed at a corner portion of the upper end inner peripheral edge portion of the C-shaped ring 7, and as shown in fig. 9D, tapered surfaces 7C may be formed at respective corner portions of the upper end inner peripheral edge portion and the upper end outer peripheral edge portion of the C-shaped ring 7. Alternatively, as shown in fig. 9E, tapered surfaces 7C may be formed at the respective corner portions of the upper end inner peripheral edge portion and the lower end outer peripheral edge portion of the C-shaped ring 7, and as shown in fig. 9F, tapered surfaces 7C may be formed at the respective corner portions of the upper end inner peripheral edge portion and the lower end outer peripheral edge portion other than the lower end inner peripheral edge portion of the C-shaped ring 7.
According to the pipe joint 1 of the present embodiment, the force F (force in the direction perpendicular to the first tapered surface 5 a) acting on the engaging portion of the corner portion of the C-shaped ring 7 that engages with the first tapered surface 5a 2 、F 3 Horizontal component force F of 21 、F 31 The C-ring 7 is reduced in diameter, and the inner peripheral surface of the C-ring 7 is pressed against the second locking groove 15 of the body 3. As a result, even if the adapter 2 and the body 3 are repeatedly rotated relative to each other by vibration or the like in a state where the fluid pressure is applied, the body 3 can be prevented from coming off the adapter 2, and the durability of the pipe joint 1 against rotation can be improved.
Further, according to the pipe joint 1 of the present embodiment, the frictional force on the contact surface between the C-ring 7 and the body 3 is reduced, so that the amount of wear on the contact surface between the C-ring 7 and the body 3 is reduced, and the body 3 can be prevented from coming off the adapter 2.
< second embodiment >
In the pipe joint of the present embodiment, as described below, the configuration of the first locking groove 205 is different from that of the first embodiment, but is the same as that of the first embodiment except for this point.
Fig. 10A and 10B are enlarged cross-sectional views of essential parts showing the operation of the C-ring when fluid pressure acts on the pipe joint of the present embodiment.
As shown in fig. 10A, a first tapered surface 205a whose diameter decreases toward the opening direction of the adapter 202 is provided at the opening side portion of the adapter 202 of the first locking groove 205. The bottom surface 205d of the lower end of the first locking groove 205 in fig. 10A is formed as an annular flat surface (horizontal surface) parallel to the direction perpendicular to the axis of the adapter 202 (the left-right direction in fig. 10A). The bottom surface 205d and the first tapered surface 205a are connected to each other by a vertical surface 205e parallel to the axial direction of the adapter 202.
In the pipe joint having the above-described locking structure, as shown in fig. 10A, in a state where the adaptor 202 and the body 203 are connected, the C-ring 207 is locked in both the first locking groove 205 of the adaptor 202 and the second locking groove 215 of the body 203, and the body 203 is prevented from coming off the adaptor 202.
When the fluid pressure acts on the pipe joint and the main body 203 receives a force in a direction (upward in fig. 10A) in which the main body 203 is pulled out from the adapter 202, as shown in fig. 10B, the corner of the C-ring 207 comes into contact with the tapered surface 205a of the first locking groove 205 formed in the adapter 202 at the engagement point a and comes into contact with the second locking groove 205 formed in the main body 203 at the engagement point BThe stop grooves 215 are in contact. At this time, a force f perpendicular to the tapered surface 205a of the first locking groove 205 acts on the engagement point a 2 。
According to the pipe joint of the present embodiment, the force f (force perpendicular to the tapered surface 205 a) acting on the engaging portion of the corner portion of the C-shaped ring 207 that engages with the tapered surface 205a 2 Horizontal component force f 21 The C-ring 207 is reduced in diameter, and the inner peripheral surface of the C-ring 207 is pressed against the second locking groove 215 of the body 203. As a result, even if the adaptor 202 and the body 203 repeatedly rotate relative to each other due to vibration or the like in a state where the fluid pressure is applied, the body 203 can be prevented from coming off the adaptor 202, and the durability of the pipe joint against rotation can be improved.
Further, an upward vertical resistance N is applied to an engagement point b between the corner portion of the C-shaped ring 207 and the bottom surface 215b of the second engagement groove 215, and if the coefficient of friction at the engagement point b is μ, a frictional force μ · N in the direction of the arrow shown in the drawing is applied to the engagement point b. Thus, due to the force f 2 Horizontal component force f 21 And a frictional force μ · N, a couple in the clockwise direction in fig. 10B acts on the C-ring 207, and due to the action of the couple, the C-ring 207 falls down inside the first locking groove 205 and the second locking groove 215, and an engagement amount (overlapping amount) of the C-ring 207 with the second locking groove 215 at the engagement point B may become small. In this case, as shown in the first embodiment, the C-ring 207 is disposed so as to enter the space between the first locking groove 205 and the second locking groove 215 by providing the first locking groove 205 with a small inner diameter portion, and the falling of the C-ring 207 can be restricted by the small inner diameter portion of the first locking groove 205, and the falling amount can be suppressed to be small.
The application of the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications are possible within the scope of the technical idea described in the claims, the specification, and the drawings. For example, the second tapered surface may be a surface parallel to the direction perpendicular to the axis of the adapter, that is, a surface parallel to the bottom surface of the lower end of the first locking groove. In contrast to the above embodiment, the adapter may be a male member and the body may be a female member. Further, the pipe joint may be provided with a plurality of female members and a plurality of male members.
Various modifications of the pipe joint of the present invention will be described below with reference to fig. 11 to 15.
< modification 1 >
Fig. 11 is a vertical half-sectional view showing a state before the female member and the male member of the pipe joint according to modification 1 of the present invention are fastened, and in a pipe joint 1A of this modification, the female member and the male member are reversed with respect to the pipe joint 1 (see fig. 1) of the first embodiment. That is, the adapter 2 as a female member disposed at the upper side of fig. 11 is inserted with the body 3 as a male member disposed at the lower side thereof, and these adapter 2 and body 3 are simply connected by one-touch operation. In practice, the body 3 is fastened to an apparatus not shown using a tool not shown, and then the body 3 is inserted into the adapter 2 from below and connected to the apparatus.
In fig. 11, the same components as those shown in fig. 1 are denoted by the same reference numerals, and in the adapter 2, the C-shaped ring 7 is fitted and held in the first locking groove 5, and the O-ring 8 is fitted in the annular groove 6. In addition, in the body 3, a second locking groove 15 is formed in the outer periphery of the insertion portion 3A1.
The basic configuration of the pipe joint 1A of the present modification configured as described above is the same as that of the pipe joint 1 (see fig. 1) of the first embodiment, and therefore, the same effects as those of the first embodiment can be obtained also in the pipe joint 1A of the present modification.
< modification 2 >
Fig. 12 is a longitudinal half sectional view of a female member of a pipe joint according to modification 2 of the present invention, in which an O-ring 17 for preventing foreign matter is fitted into an annular groove 16 formed along the entire circumference on the inner peripheral portion of the upper end of the adapter 2 as the female member, and the other configuration is the same as that of the adapter 2 (see fig. 1) according to the first embodiment. Therefore, in fig. 12, the same components as those shown in fig. 1 are given the same reference numerals.
< modification 3 >
Fig. 13 is a longitudinal half sectional view of a female member of a pipe joint according to modification 3 of the present invention, in which a circular hole 2C having the same diameter is formed through the center of the shaft of an adapter 2 as the female member, and a C-ring 7 and an O-ring 8 are fitted and held in first locking grooves 5 and annular grooves 6 formed in the upper and lower sides of the circular hole 2C, respectively. Further, an O-ring 18 is fitted around the outer periphery between the nut portion 2A and the screw portion 2B in the height direction (vertical direction). The other structure is the same as that of the adaptor 2 (see fig. 1) of the first embodiment. Therefore, in fig. 13, the same components as those shown in fig. 1 are given the same reference numerals.
< modification 4 >
Fig. 14 is a longitudinal half sectional view of a female member of a pipe joint according to modification 4 of the present invention, and in this modification, an O-ring 17 for preventing foreign matter is fitted into an annular groove 16 formed at the upper end of a circular hole 2c in the adapter 2 according to modification 3, and the other configuration is the same as that shown in modification 3 (see fig. 13).
< modification 5 >
Fig. 15 is a longitudinal half sectional view of a female member of a pipe joint according to modification 5 of the present invention, in which an adapter 2 is a T-shaped tubular member, and three openings (two upper and lower and one side portion) are formed in the adapter 2. C-shaped sealing rings 7 and O-shaped sealing rings 8 are respectively embedded in the three openings.
Therefore, the elbow-shaped or Y-shaped body 3, not shown, can be inserted into the adaptor 2 from three directions and connected thereto.
< method for mounting pipe joint >
The pipe joint according to each of the above embodiments and modifications is attached by, for example, attaching the adapter 2 to the device and then connecting the body 3 to the adapter 2.
Description of the symbols
1: a pipe joint;
2: an adapter (female member);
3: a main body (male member);
5: a first locking groove;
5a: a first conical surface of the first locking groove;
5b: a small inner diameter portion of the first engaging groove;
5c: a second tapered surface of the first locking groove;
5d: the bottom surface of the first clamping groove;
5e: a vertical surface of the first locking groove;
7: a C-shaped ring;
7a: a conical surface of the C-shaped ring;
7b: the bottom surface of the C-shaped ring;
7c: a conical surface of the C-shaped ring;
15: a second locking groove;
15a: a conical surface of the second locking groove;
15b: the bottom surface of the second clamping groove;
15c: the vertical surface of the second clamping groove.
Claims (7)
1. A pipe joint, comprising:
a cylindrical female member having a diameter-expandable elastic ring member held in a first locking groove formed in an inner peripheral surface thereof; and
a male member having a cylindrical shape with a second locking groove formed on an outer peripheral surface thereof, the male member being connected to the female member via the elastic ring member by inserting the male member while pushing open the elastic ring member,
the elastic ring member is constituted by a circular ring having a rectangular longitudinal section with a part cut away,
the first engaging groove is provided with a first tapered surface that is reduced in diameter toward the opening of the female member at the opening side portion of the female member.
2. The pipe coupling according to claim 1,
a small inner diameter portion having an inner diameter smaller than that of the first engaging groove is provided on the opposite side of the opening direction of the female member in contact with the first tapered surface.
3. The pipe coupling according to claim 2,
the small inner diameter portion has a surface parallel to an axial direction of the female member.
4. The pipe coupling according to claim 2 or 3,
the second tapered surface, which is reduced in diameter in the opening direction of the concave member, is connected to the small inner diameter portion and is provided on the opposite side of the opening direction of the concave member.
5. The pipe joint according to any one of claims 1 to 4,
the end surface of the second locking groove on the opening side of the male member is formed by a plane perpendicular to the axial direction of the insertion portion of the male member into the female member.
6. The pipe joint according to any one of claims 1 to 5,
the elastic ring part is provided with a tapered surface at the outer peripheral edge of one axial end or the outer peripheral edges of both axial ends.
7. A method of installing a pipe joint, wherein,
a method of mounting a pipe joint according to any one of claims 1 to 6,
after the female member is mounted on the device, the male member is connected to the female member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021135841A JP2023030617A (en) | 2021-08-23 | 2021-08-23 | Pipe joint and mounting method of the same |
| JP2021-135841 | 2021-08-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115711329A true CN115711329A (en) | 2023-02-24 |
Family
ID=85230529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210926313.4A Pending CN115711329A (en) | 2021-08-23 | 2022-08-03 | Pipe joint and method of mounting the same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2023030617A (en) |
| KR (1) | KR20230029530A (en) |
| CN (1) | CN115711329A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3178018B2 (en) | 1991-08-29 | 2001-06-18 | 新神戸電機株式会社 | Paste cadmium cathode plate for alkaline storage batteries |
| JP2008180366A (en) | 2006-12-27 | 2008-08-07 | Bridgestone Corp | Pipe joint and hose |
-
2021
- 2021-08-23 JP JP2021135841A patent/JP2023030617A/en active Pending
-
2022
- 2022-08-03 CN CN202210926313.4A patent/CN115711329A/en active Pending
- 2022-08-16 KR KR1020220101812A patent/KR20230029530A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JP2023030617A (en) | 2023-03-08 |
| KR20230029530A (en) | 2023-03-03 |
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