CN109654318B - Joint device for water distribution pipe - Google Patents
Joint device for water distribution pipe Download PDFInfo
- Publication number
- CN109654318B CN109654318B CN201910083034.4A CN201910083034A CN109654318B CN 109654318 B CN109654318 B CN 109654318B CN 201910083034 A CN201910083034 A CN 201910083034A CN 109654318 B CN109654318 B CN 109654318B
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- China
- Prior art keywords
- joint
- metal sleeve
- ring
- water
- resin ring
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/26—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses specially adapted for hoses of metal
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/025—Water supply lines as such, e.g. shower hoses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L21/00—Joints with sleeve or socket
- F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Constructive types of pipe joints not provided for in groups F16L13/00 - F16L23/00 ; Details of pipe joints not otherwise provided for, e.g. electrically conducting or insulating means
- F16L25/02—Electrically insulating joints or couplings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/18—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses characterised by the use of additional sealing means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Joints With Sleeves (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention provides a joint device for a water distribution pipe, which can reduce resistance in the pipe by enabling water to flow without disorder during use, and can reduce local load on a resin ring even if negative pressure exists in the pipe so as to fully support the resin ring, thereby ensuring water tightness and electric corrosion resistance of the joint device. In a joint device (10) for a water distribution pipe, a joint member (40) comprises: a joint body (42) that covers the outer peripheries of the plurality of resin rings (30); a joint extension (44) that extends from the joint body (42) toward the axial distal end side and that has a joint-side passage (43) formed therethrough in the axial direction; and a tapered portion (45) that is reduced in diameter from the peripheral surface of the joint-side passage (43) to the inner peripheral surface (31c) of the small-diameter portion (31 b).
Description
Technical Field
The present invention relates to a joint device for a water distribution pipe having a joint member on a pipe body.
Background
Conventionally, a water supply pipe, a sprinkler branch pipe, and the like have been constructed by piping a pipe body using various joint members such as a so-called pipe joint and a box nut.
For example, as shown in fig. 7, the sprinkler branch pipe or the like connects a fire pipe 101 disposed on the back side of the ceiling 100 and a sprinkler head 102 provided on the ceiling 100 with a flexible steel pipe 103 or the like such as a stainless steel pipe. The flexible steel pipe 103 has a pipe body 104 and a bellows portion 105, and when piping is performed, an insulating member 106 is attached to the pipe body 104 on the sprinkler head 102 side, the insulating member 106 is sandwiched by a fitting 107, and the fitting 107 is attached to a fixing member 108 provided on the back side of the ceiling 100.
With such a structure, insulation with respect to the pipe body 104 is ensured, and electric corrosion due to a current caused by leakage current flowing in the building and a potential difference generated between the pipe body 104 and a different metal pipe is prevented. In addition, at a branching portion from the fire-fighting pipe 101, the flexible steel pipe 103 is connected to the branching joint portion 109 provided in the fire-fighting pipe 101 by using the joint device 200 for a water distribution pipe in which a joint member or the like is assembled to an end portion of the flexible steel pipe 103, thereby preventing galvanic corrosion between different types of metals.
If the joint device 200 for water distribution pipe is configured such that a pipe joint is integrally fixed to the flexible steel pipe 103, the entire flexible steel pipe 103 needs to be rotated with respect to the branching joint 109 during piping, and therefore, the installation may be difficult. Further, when the joint device 200 for a water distribution pipe is configured by a pipe joint and a nut, the pipe joint needs to be screwed into the branch joint portion 109 in advance, and the work load increases. In order to solve these problems, a joint device for a water distribution pipe using a rotary joint member has been proposed (for example, patent document 1).
Prior art documents
Patent document
Patent document 1: japanese patent No. 3855170
Disclosure of Invention
Fig. 4 of patent document 1 discloses a conventional rotary joint device for piping. A conventional common rotary type joint device for piping is provided with an O-ring and an insulating member between a rotary type pipe joint and a pipe body, which are different types of metals. More specifically, a metal sleeve is fitted to the outside of the end portion side of the pipe body, a resin sleeve is provided between the metal sleeve and the pipe joint, the metal sleeve and the resin sleeve are crimped by a clamp ring, the pipe joint is prevented from coming off by a stopper ring, and the metal of the pipe body and the branch joint portion side are prevented from directly contacting each other by a resin spacer.
However, in the conventional general rotary type joint device for piping, the compression ratio of the O-ring is set low so that the rotation is easy in view of workability, and therefore, there is a possibility that water leakage may occur due to high water pressure or the like. In addition, since the insulating member made of resin is sandwiched between metals for the purpose of a countermeasure against dissimilar metals, the insulating member receives an O-ring for rotation and sealing. In this case, the accuracy of the resin insulating member needs to be improved, which increases the cost. Further, since the interior of the sprinkler branch pipe is always used in a state filled with water after piping, it is necessary to take a measure against corrosion of dissimilar metals to ensure strong water tightness.
As a technique for implementing the above-described measures, as shown in fig. 8, a joint device 200 for a water distribution pipe of patent document 1 includes: a metal sleeve 202 fixedly attached to an end of the pipe body 201; a plurality of resin rings 203, 204, 205 attached to the outer periphery of the metal sleeve 202; and a joint member 206 that is prevented from coming off the metal sleeve 202 and the resin rings 203, 204, 205, and is fitted onto the outer periphery of the metal sleeve 202 so as to be rotatable in the circumferential direction.
The joint device 200 for a water distribution pipe has an O-ring 207 of water-swelling rubber, and the O-ring 207 is inserted into a gap between the resin rings 203 and 204 and a gap between the metal sleeve 202 and the joint member 206 and swells when exposed to water. When the pipe is constructed, the joint member 206 can rotate in the circumferential direction because the O-ring 207 is not expanded. After piping work, since the O-ring 207 expands with water, it is pressed against the joint member 206 to bring the joint member 206 into a rotation stop state, thereby securing water tightness and electric corrosion resistance of the joint device 200 for a water distribution pipe.
However, in use, water flows from the joint member 206 to the metal sleeve 202 in the pipe body 201, or water flows from the metal sleeve 202 to the joint member 206 depending on the connection site. In the pipe, it is preferable that the water flows without disturbance, and the resistance is reduced.
However, as shown in patent document 1, when the inner diameter of the metal sleeve 202 is different from the inner diameter of the extending portion 208 of the coupling member 206, the switching portion 209 between the metal sleeve 202 and the extending portion 208 of the coupling member 206 is a complicated step, and therefore, when water flows, there is a possibility that the flow resistance increases due to turbulent flow at the switching portion 209 between the metal sleeve 202 and the extending portion 208 of the coupling member 206.
In recent years, when water is not flowing through the pipe, the inside of the pipe may be brought into a negative pressure state. At this time, the O-ring 207 is sucked into the pipe and presses the resin ring 203 against the position regulating portion 210 on the inner peripheral side of the joint member 206. Since the inner diameter end of the position regulating portion 210 is located radially outward of the inner periphery of the extending portion 208, the contact area between the resin ring 203 and the position regulating portion 210 is small, and if the resin ring 203 is pressed against the position regulating portion 210, a load is locally applied to the contact portion of the resin ring 203, and it is difficult to sufficiently support the resin ring 203.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint device for a water distribution pipe, which can reduce resistance in a pipe by allowing water to flow without disturbance during use, can reduce a local load even if negative pressure is applied to the inside of the pipe, can sufficiently support a resin ring, and can ensure water tightness and electric corrosion resistance of the joint device.
In order to achieve the above object, a joint device for a water distribution pipe according to the present invention includes: a cylindrical metal sleeve fixedly attached to an end of the pipe body; a resin ring having insulation properties and mounted on the outer periphery of the metal sleeve; a joint member having a joint body portion rotatably attached to an outer periphery of the resin ring in a circumferential direction and a joint extension portion extending to a position closer to an axial distal end side than a distal end portion of the metal sleeve; a retaining portion provided in the joint member for preventing the joint member from being detached from the metal sleeve; and an O-ring liquid-tightly attached between an outer peripheral surface of the metal sleeve and an inner peripheral surface of the joint body, the resin ring including: an outer peripheral portion attached to a distal end side of an outer periphery of the metal sleeve; and a small diameter portion that is reduced in diameter from a distal end of the outer peripheral portion and abuts against a distal end portion of the metal sleeve, wherein the joint member has a joint-side passage having a diameter larger than an inner diameter of the metal sleeve and a tapered portion that is reduced in diameter from a peripheral surface of the joint-side passage toward the small diameter portion of the resin ring, on an inner peripheral surface on a distal end side of the joint extension portion, and the joint extension portion has a support surface that supports a distal end side of the small diameter portion over an entire surface.
According to this structure, the joint member includes: a joint extension portion extending from the joint main body portion toward an axial distal end side and formed with a joint-side passage penetrating in an axial direction; and a tapered portion that is reduced in diameter from the peripheral surface of the joint-side passage toward the inner peripheral surface of the small-diameter portion, and therefore, when in use, the resistance in the pipe can be reduced by causing a liquid such as water to flow without turbulence.
In the joint device for a water distribution pipe according to the present invention, the joint extension portion has a support surface for supporting the entire surface of the distal end side of the small diameter portion. Therefore, the support surface supports the entire surface of the distal end side of the small diameter portion of the resin ring, and therefore, the resin ring can be sufficiently supported even by negative pressure in the pipe, and a local load on the resin ring can be reduced.
In the joint device for a water distribution pipe according to the present invention, it is preferable that a continuous surface continuous with an inner peripheral surface of the small diameter portion is formed at an end portion of the tapered portion on the small diameter portion side. According to this configuration, since the continuous surface continuous with the inner peripheral surface of the small diameter portion is formed at the end portion on the small diameter portion side of the tapered portion, the end portion of the tapered portion and the small diameter portion can be made continuous by the continuous surface, and the turbulence of water can be further reduced, thereby further reducing the resistance of water in the pipe.
In the joint device for a water distribution pipe according to the present invention, it is preferable that an inner peripheral surface of the small diameter portion is continuous with a sleeve-side passage that axially penetrates the metal sleeve. According to this configuration, the sleeve-side passage through which the metal sleeve penetrates in the axial direction is continuous with the inner peripheral surface of the small diameter portion, and therefore, turbulence of water can be further reduced, and resistance of water in the pipe can be further reduced.
In the joint device for a water distribution pipe according to the present invention, it is preferable that the metal sleeve has a step portion protruding from the outer circumferential direction in the middle of the axial direction, and further has a 2 nd resin ring on the outer circumference of the metal sleeve on the tip side of the step portion, and the 2 nd resin ring is disposed so that the O-ring is sandwiched between the 2 nd resin ring and the resin ring.
According to this configuration, since the O-ring is sandwiched between the resin ring and the 2 nd resin ring in the front and rear of the metal sleeve in the axial direction, the O-ring can be prevented from being damaged even when the joint member is rotated with respect to the metal sleeve during piping work.
In the joint device for a water distribution pipe according to the present invention, the O-ring is preferably a water-swellable rubber that swells with water.
According to this configuration, the joint member can be rotated in the circumferential direction by the O-ring before water expansion during piping work, and the joint member is brought into a rotation stop state by pressure-bonding the joint member by the O-ring after water expansion after piping work, whereby water tightness and electric corrosion resistance of the joint device can be ensured.
Drawings
Fig. 1 is a partial sectional view showing a joint apparatus for a water distribution pipe according to the present invention.
Fig. 2(a) is an explanatory diagram showing a state in which the O-rings are fitted immediately after piping work. Fig. 2(b) is an explanatory diagram showing a fitting state of the O-ring when used.
Fig. 3(a) is an explanatory diagram showing a state in which the O-ring is fitted immediately after the negative pressure is generated in the pipe. Fig. 3(b) is a diagram showing the action of the resin ring due to the O-ring after the inside of the pipe becomes negative pressure.
Fig. 4(a) is an explanatory view showing a fitting state of the O-ring immediately after negative pressure is generated in the pipe according to the comparative example. Fig. 4(b) is a diagram showing the action of the resin ring due to the O-ring after the inside of the pipe has reached a negative pressure in the comparative example.
Fig. 5(a) is an action diagram of the flow of water according to the example. Fig. 5(b) is an action diagram of the flow of water according to the comparative example.
Fig. 6 is a partial sectional view showing another embodiment of the joint device for a water distribution pipe of fig. 1.
Fig. 7 is an explanatory view showing a structure of a conventional sprinkler branch pipe.
Fig. 8 is a partial cross-sectional view showing a conventional joint device for a water distribution pipe.
Description of the reference numerals
10 … joint device for water distribution pipe
11a … pipe body
20 … Metal Sleeve
21 … outer periphery
22 … step part
23 … front end
24 … Sleeve side passage
30 … resin ring
31 … ring made of resin No. 1
31a … outer peripheral portion
31b … small diameter part
31c … inner peripheral surface
32 … No. 2 resin Ring
40 … Joint part (pipe joint)
41 … anti-dropping part (stop ring)
42 … joint body part
43 … Joint side passage
44 … joint extension
45 … taper
46 … continuous surface
50 … O-ring
51 … gap
Detailed Description
(embodiment mode)
Embodiments of the present invention will be described below with reference to the drawings. Furthermore, the figures show conceptually (schematically) a fitting device 10 for a water distribution pipe.
As shown in fig. 1, the joint device 10 for a water distribution pipe is provided at an end portion 11c of a stainless steel flexible steel pipe 11 having a bellows portion 11b on a pipe body 11 a. The joint device 10 for a water distribution pipe includes: a cylindrical metal sleeve 20 that is provided at the end portion 11c of the pipe body 11a and is integrally fixed to the end portion 11c of the pipe body 11 a; a plurality of resin rings 30 having insulation properties and attached to the outer periphery 21 of the metal sleeve 20; and a joint member 40 attached to the outer peripheries of the plurality of resin rings 30 so as to be rotatable in the circumferential direction and extending to a position on the axial front end side of the front end portion of the metal sleeve 20.
The joint device 10 for a water distribution pipe includes: a retaining portion 41 provided on the joint member 40 for preventing the joint member 40 from being detached from the metal sleeve 20; and a water-swelling rubber O-ring 50 inserted into a gap 51 between the resin rings 30 and between the metal sleeve 20 and the joint member 40, and swollen with water.
The metal sleeve 20 includes: an outer periphery 21 formed continuously from an end portion 11c of the pipe body 11 a; an annular step portion 22 projecting from the outer periphery 21 in the axial direction toward the outer diameter direction; and an annular tip portion 23 formed at the tip of the outer periphery 21, and the metal sleeve 20 is formed with a sleeve-side passage 24 communicating from the inner diameter end of the tip portion 23 to the pipe body 11 a.
The step portion 22 has: a 1 st standing wall 22a formed in the outer diameter direction from the outer periphery 21 on the distal end side; a 1 st step portion 22b formed from an outer diameter end of the 1 st standing wall 22a toward an axial base end side; a 2 nd standing wall 22c formed from the axial proximal end of the 1 st stepped portion 22b in the outer diameter direction; a 2 nd step portion 22d formed from an outer diameter end of the 2 nd standing wall 22c toward an axial base end side; and a 3 rd standing wall 22e formed in the outer diameter direction from the outer periphery 21 on the base end side toward the axial base end of the 2 nd stepped portion 22 d.
Further, a chamfered portion or an R portion may be formed at a junction between the surface and the surface of the metal sleeve 20.
The plurality of resin rings 30 include: a 1 st resin ring 31 externally fitted to the tip side of the metal sleeve 20; a 2 nd resin ring 32 externally fitted to an axially intermediate portion of the metal sleeve 20; and a 3 rd resin ring 33 externally fitted to the base end side of the metal sleeve 20.
The 1 st resin ring 31 is composed of an outer peripheral portion 31a attached to the distal end side of the outer periphery 21 of the metal sleeve 20, and a small diameter portion 31b that is reduced in diameter from the distal end of the outer peripheral portion 31a and is locked to the distal end portion 23 of the metal sleeve 20. The outer peripheral portion 31a of the 1 st resin ring 31 is fitted to be shorter than the axial length of the outer periphery 21 on the tip side of the metal sleeve 20. The inner peripheral surface 31c of the small diameter portion 31b of the 1 st resin ring 31 is continuous with the sleeve-side passage 24 that axially penetrates the metal sleeve 20.
The 2 nd resin ring 32 is composed of an outer peripheral portion 32a which is attached to the middle of the outer periphery 21 of the metal sleeve 20 and is capable of abutting against the 1 st standing wall 22a, and a convex portion 32b which is formed along the 1 st step portion 22b from the axial base end side of the outer peripheral portion 32 a. The outer peripheral portion 32a is fitted to the outside so as to be shorter than the axial length of the outer periphery 21 on the tip end side of the metal sleeve 20. The convex portion 32b is externally fitted shorter than the axial length of the 1 st step portion 22 b.
The 2 nd resin ring 32 is disposed so as to be fitted on the stepped portion 22 side of the outer periphery 21 (outer peripheral surface) of the metal sleeve 20, and sandwiches the O-ring 50 with the 1 st resin ring 31. The gap 51 into which the O-ring 50 is inserted is a space surrounded by the 1 st resin ring 31, the 2 nd resin ring 32, the metal sleeve 20, and the joint member 40 adjacent to each other. Further, a water-swelling rubber O-ring 52 having a smaller cross-sectional diameter than the O-ring 50 is fitted over the 1 st step portion 22 b. The O-ring 52 for the step portion is fitted into the gap 53 surrounded by the convex portion 32b of the 2 nd resin ring 32, the 1 st step portion 21b, the 2 nd standing wall 22c, and the joint member 40.
The 3 rd resin ring 33 is attached to the base end side of the outer periphery 21 of the metal sleeve 20 and is provided to be able to abut against the 3 rd standing wall 22 e. The 3 rd resin ring 33 is externally fitted to be shorter than the axial length of the outer periphery 21 on the base end side of the metal sleeve 20.
The joint member 40 has: a joint body 42 covering the outer peripheries of the plurality of resin rings 30; a joint extension portion 44 that extends from the joint main body portion 42 toward the axial tip end side and is formed with a joint-side passage 43 that penetrates in the axial direction; a tapered portion 45 that is reduced in diameter from the peripheral surface of the joint-side passage 43 toward the inner peripheral surface 31c of the small-diameter portion 31b of the 1 st resin ring 31; and an annular groove 47 provided on the base-end-side inner peripheral surface. The joint-side passage 43 is formed to have a diameter larger than the inner diameter of the metal sleeve 20.
The retaining portion 41, i.e., a C-shaped stopper ring is fitted into the annular groove portion 47, and the 3 rd resin ring 33 is disposed between the retaining portion 41 and the stepped portion 22. The stopper ring as the retaining portion 41 abuts on the 3 rd resin ring 33, and the 3 rd resin ring 33 abuts on the stepped portion 22, thereby preventing the joint member 40 from being separated from the metal sleeve 20 and the resin ring 30.
A continuous surface 46 continuous with the inner peripheral surface 31c of the small diameter portion 31b is formed at the end portion of the tapered portion 45 on the small diameter portion 31b side. The tapered portion 45 is formed with a support surface 45a that supports the entire surface of the tip end side of the small-diameter portion 31 b.
Further, inside the gaps 51 and 53, O- rings 50 and 52 made of water-swellable rubber are respectively attached between the surface of the outer periphery 21 of the metal sleeve 20 and the inner peripheral surface of the joint main body portion 42 in a liquid-tight manner. The O- rings 50 and 52 are preferably formed to be large on the side (right side in the drawing) where water enters and small on the downstream side.
Next, the operation of the above-described joint device 10 for a water distribution pipe will be described.
The joint device for a water distribution pipe 10 abuts against the joint member 40 provided on the pipe body 11a and the target side joint part at the time of piping, and rotates and screws the joint member 40. At this time, since the water-swelling rubber O-ring 50 is in an original state before swelling without containing water, the joint member 40 can be rotated in the circumferential direction. Thus, even if the pipe body 11a is in a fixed state, the joint member 40 can be freely rotated in the circumferential direction, and workability in pipe construction can be improved.
The joint device 10 for a water distribution pipe after construction is pressurized with a water pressure of, for example, about 1.0MPa, and water penetrates into a narrow gap between the joint member 40 and the resin ring 30 (the 1 st resin ring 31), but the O-ring 50 that has contacted the penetrated water expands and becomes a state shown in fig. 2(b) from the state shown in fig. 2(a), and strongly contacts the inner peripheral surface of the joint member 40 by its own expansion force to stop the rotation of the joint member 40, and prevents water leakage to the downstream side as shown in fig. 2(b) to ensure high water tightness. The O-ring 52 for the stepped portion disposed on the downstream side functions as a water-tight seal in the event of water leakage from the O-ring 50 on the upstream side. Further, the resin ring 30 can ensure the electric corrosion resistance.
Next, the operation of the joint device 10 for a water distribution pipe when negative pressure is applied to the inside of the pipe will be described.
As shown in fig. 3(a), if the inside of the pipe is at a negative pressure, the O-ring 50 is sucked from the narrow gap between the joint member 40 and the 1 st resin ring 31, and as shown in fig. 3(b), the O-ring 50 presses the outer peripheral portion 31a of the 1 st resin ring 31, and the small diameter portion 31b of the 1 st resin ring 31 presses the end of the tapered portion 45. At this time, the area of the axial distal end side of the small diameter portion 31b is larger than the area of the axial proximal end side of the outer peripheral portion 31a, and therefore the pressing force of the O-ring 50 is dispersed by the small diameter portion 31b and the pressure is reduced. Since the tapered portion 45 is reduced in diameter toward the inner peripheral surface 31c of the small-diameter portion 31b and the small-diameter portion 31b is supported as a whole by the support surface 45a on the back side of the tapered portion 45, the 1 st resin ring 31 can be sufficiently supported even if the pressure in the pipe is negative, and the load on the 1 st resin ring 31 can be reduced locally.
On the other hand, fig. 4(a) is a diagram showing a state of a comparative example, and if the inside of the pipe is negative pressure, the O-ring 207 is sucked from a narrow gap between the joint member 206 and the resin ring 203, and as shown in the comparative example of fig. 4(b), the O-ring 207 presses the outer peripheral portion 203a of the resin ring 203, and the small diameter portion 203b of the resin ring 203 presses the position restricting portion 210 inside the joint member 206. At this time, the area of the axial distal end side of the position regulating portion 210 inside the joint member 206 is smaller than the area of the axial proximal end side of the small diameter portion 203b, and therefore the pressing force of the O-ring 207 is collected to the position regulating portion 210 and the pressure increases. Therefore, a local load on the resin ring 203 becomes large.
Next, the operation of the tapered portion 45 will be described.
Fig. 5(a) shows a state in which water flows in the joint device for a water distribution pipe 10 of the embodiment, and the joint member 40 includes: a joint extension portion 44 that extends from the joint main body portion 42 toward the axial tip end side and is formed with a joint-side passage 43 that penetrates in the axial direction; and a tapered portion 45 that is reduced in diameter from the peripheral surface of the joint-side passage 43 toward the inner peripheral surface 31c of the small-diameter portion 31b, and therefore, when in use, water flows without turbulence, and resistance in the pipe can be reduced.
Further, since the continuous surface 46 continuous with the inner peripheral surface 31c of the small diameter portion 31b is formed at the end portion of the tapered portion 45 on the small diameter portion 31b side, the end portion of the tapered portion 45 and the small diameter portion 31b can be made a continuous surface by the continuous surface 46, and turbulence of water can be further reduced, thereby further reducing resistance of water in the pipe. Further, since the sleeve-side passage 24, which axially penetrates the metal sleeve 20, is continuous with the inner circumferential surface 31c of the small-diameter portion 31b, turbulence of water can be further reduced, and resistance of water in the pipe can be further reduced.
Fig. 5(b) shows a state in which water flows in the joint device 200 for a water distribution pipe of a comparative example, and in a case where the size of the inner diameter of the metal sleeve 202 is different from the size of the inner diameter of the extension portion 208 of the joint member 206, since the switching portion 209 between the metal sleeve 202 and the extension portion 208 of the joint member 206 has a complicated step, there is a possibility that the flow is disturbed at the switching portion 209 between the metal sleeve 202 and the extension portion 208 of the joint member 206 and the resistance to the flow is increased when water flows.
Next, a joint device 10a for a water distribution pipe according to another embodiment of the joint device 10 for a water distribution pipe of fig. 1 will be described with reference to fig. 6. As shown in fig. 6, the joint device 10a for a water distribution pipe has a structure in which 1O-ring 50 is disposed. In this case, a stepped portion 22 that protrudes in the outer diameter direction at an axial middle portion of the outer periphery 21 of the metal sleeve 20 is formed on the outer periphery 21 of the metal sleeve 20, as in fig. 1. The step portion 22 is composed of 1 stage. The 2 nd resin ring 32 is fitted to the outer periphery 21 of the metal sleeve 20 and can be brought into contact with the stepped portion 22.
The operational effect is the same as the joint device 10 for a water distribution pipe shown in fig. 1, but the shape of the step portion 22 is simple, the processing cost can be reduced, and the part cost can be reduced because only one O-ring 50 is used without the O-ring 52 for the step portion shown in fig. 1.
In the embodiment, the sleeve-side passage 24, the inner circumferential surface 31c, and the continuous surface 46 are continuous passages (surfaces), but are not limited thereto, and even if the surfaces are not strictly aligned, if the axial proximal end side of the tapered portion 45 extends substantially toward the inner circumferential surface 31c, the diameter of the axial proximal end side end portion of the tapered portion 45 may be larger than the diameter of the inner circumferential surface 31 c. The diameter of the inner peripheral surface 31c and the diameter of the end portion of the tapered portion 45 on the axial proximal end side may be larger than the diameter of the sleeve-side passage 24.
In the embodiment, the O- rings 50 and 52 are water-swellable rubbers that swell in water, but the present invention is not limited thereto, and at least one of the O- rings 50 and 52 may be a normal O-ring made of rubber that does not swell in water, synthetic resin, or the like.
Claims (9)
1. A joint device for a water distribution pipe, comprising:
a cylindrical metal sleeve fixedly attached to an end of the pipe body; a resin ring having insulation properties and mounted on the outer periphery of the metal sleeve; a joint member having a joint body portion rotatably attached to an outer periphery of the resin ring in a circumferential direction and a joint extension portion extending to a position closer to an axial distal end side than a distal end portion of the metal sleeve; a retaining portion provided in the joint member for preventing the joint member from being detached from the metal sleeve; and an O-ring liquid-tightly fitted between an outer peripheral surface of the metal sleeve and an inner peripheral surface of the joint body,
the resin ring includes: an outer peripheral portion attached to a distal end side of an outer periphery of the metal sleeve; and a small diameter portion that is reduced in diameter from a distal end of the outer peripheral portion and that abuts against a distal end portion of the metal sleeve,
the coupling member has a threaded portion on an outer peripheral surface on a distal end side of the coupling extension portion, and has: a joint-side passage having a diameter larger than the inner diameter of the metal sleeve and having no screw portion, and a tapered portion that decreases in diameter from the peripheral surface of the joint-side passage toward the small diameter portion of the resin ring,
the joint extension portion has a support surface that supports the entire surface of the distal end side of the small diameter portion.
2. Joint device for water distribution pipes according to claim 1,
a continuous surface continuous with an inner peripheral surface of the small diameter portion is formed at an end portion of the tapered portion on the small diameter portion side.
3. Joint device for water distribution pipes according to claim 1 or 2,
the inner peripheral surface of the small diameter portion is continuous with a sleeve-side passage that axially penetrates the metal sleeve.
4. Joint device for water distribution pipes according to claim 1 or 2,
the metal sleeve has a step portion protruding from the outer circumferential direction halfway in the axial direction in the outer diameter direction,
the metal sleeve further includes a 2 nd resin ring at a position on the outer periphery of the metal sleeve on a tip side of the stepped portion, the 2 nd resin ring being disposed so as to sandwich the O-ring between the 2 nd resin ring and the resin ring.
5. Joint device for water distribution pipes according to claim 3,
the metal sleeve has a step portion protruding from the outer circumferential direction halfway in the axial direction in the outer diameter direction,
the metal sleeve further includes a 2 nd resin ring at a position on the outer periphery of the metal sleeve on a tip side of the stepped portion, the 2 nd resin ring being disposed so as to sandwich the O-ring between the 2 nd resin ring and the resin ring.
6. Joint device for water distribution pipes according to claim 1 or 2,
the O-shaped ring is water-swelling rubber which swells when meeting water.
7. Joint device for water distribution pipes according to claim 3,
the O-shaped ring is water-swelling rubber which swells when meeting water.
8. Joint device for water distribution pipes according to claim 4,
the O-shaped ring is water-swelling rubber which swells when meeting water.
9. Joint device for water distribution pipes according to claim 5,
the O-shaped ring is water-swelling rubber which swells when meeting water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018088910A JP6408187B1 (en) | 2018-05-02 | 2018-05-02 | Water pipe fitting device |
| JP2018-088910 | 2018-05-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109654318A CN109654318A (en) | 2019-04-19 |
| CN109654318B true CN109654318B (en) | 2020-02-18 |
Family
ID=63855188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910083034.4A Active CN109654318B (en) | 2018-05-02 | 2019-01-28 | Joint device for water distribution pipe |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6408187B1 (en) |
| CN (1) | CN109654318B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3403149B2 (en) * | 2000-06-13 | 2003-05-06 | 株式会社藤井合金製作所 | Flexible pipe joint |
| JP2005325933A (en) * | 2004-05-14 | 2005-11-24 | Nakano Seisakusho:Kk | Terminal structure of flexible metal hose |
| JP3855170B2 (en) * | 2004-03-29 | 2006-12-06 | 株式会社昭和螺旋管製作所 | Water pipe fitting device |
| JP4058499B2 (en) * | 2004-05-17 | 2008-03-12 | 株式会社昭和螺旋管製作所 | Water pipe fitting device |
| CN101561068A (en) * | 2008-04-18 | 2009-10-21 | 光阳产业股份有限公司 | Connecting device for flexible gas tube |
| CN103115208A (en) * | 2011-11-16 | 2013-05-22 | 日立金属株式会社 | Pipe joint |
| EP2725273A1 (en) * | 2012-10-23 | 2014-04-30 | Everlux S.r.l. | Universal hydraulic connector for tubes |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS469968Y1 (en) * | 1965-12-29 | 1971-04-07 |
-
2018
- 2018-05-02 JP JP2018088910A patent/JP6408187B1/en active Active
-
2019
- 2019-01-28 CN CN201910083034.4A patent/CN109654318B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3403149B2 (en) * | 2000-06-13 | 2003-05-06 | 株式会社藤井合金製作所 | Flexible pipe joint |
| JP3855170B2 (en) * | 2004-03-29 | 2006-12-06 | 株式会社昭和螺旋管製作所 | Water pipe fitting device |
| JP2005325933A (en) * | 2004-05-14 | 2005-11-24 | Nakano Seisakusho:Kk | Terminal structure of flexible metal hose |
| JP4058499B2 (en) * | 2004-05-17 | 2008-03-12 | 株式会社昭和螺旋管製作所 | Water pipe fitting device |
| CN101561068A (en) * | 2008-04-18 | 2009-10-21 | 光阳产业股份有限公司 | Connecting device for flexible gas tube |
| CN103115208A (en) * | 2011-11-16 | 2013-05-22 | 日立金属株式会社 | Pipe joint |
| EP2725273A1 (en) * | 2012-10-23 | 2014-04-30 | Everlux S.r.l. | Universal hydraulic connector for tubes |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019194488A (en) | 2019-11-07 |
| CN109654318A (en) | 2019-04-19 |
| JP6408187B1 (en) | 2018-10-17 |
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