WO2016017652A1 - 結合金具 - Google Patents
結合金具 Download PDFInfo
- Publication number
- WO2016017652A1 WO2016017652A1 PCT/JP2015/071403 JP2015071403W WO2016017652A1 WO 2016017652 A1 WO2016017652 A1 WO 2016017652A1 JP 2015071403 W JP2015071403 W JP 2015071403W WO 2016017652 A1 WO2016017652 A1 WO 2016017652A1
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- WIPO (PCT)
- Prior art keywords
- fitting
- pressure
- coupling
- fluid
- locking
- Prior art date
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Classifications
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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
- F16L37/00—Couplings of the quick-acting type
- F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C33/00—Hose accessories
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
-
- 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
- F16L17/00—Joints with packing adapted to sealing by fluid pressure
- F16L17/06—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between the end surfaces of the pipes or flanges or arranged in recesses in the pipe ends or flanges
- F16L17/067—Plastics sealing 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
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
- F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
- F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
-
- 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
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/10—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part
- F16L37/113—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members using a rotary external sleeve or ring on one part the male part having lugs on its periphery penetrating into the corresponding slots provided in the female part
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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
- F16L37/00—Couplings of the quick-acting type
- F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
- F16L37/244—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe
- F16L37/252—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe the male part having lugs on its periphery penetrating in the corresponding slots provided in the female part
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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
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
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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
- F16L2201/00—Special arrangements for pipe couplings
- F16L2201/20—Safety or protective couplings
Definitions
- the present invention relates to a fitting for connecting pipes such as hoses and pipes or pipes to other devices such as pumps.
- safety valves have been used in steam and gas lines to protect equipment, hoses, fittings, etc. from breakage when the transfer fluid pressure is abnormally high.
- many safety valves have used many hoses, shut-off nozzles, etc. It was not suitable for the combined use activity.
- FIG. 19 shows an example of a high capacity foam radiation system.
- reference numeral 11 denotes a water source such as a sea or a lake
- reference numeral 12 denotes a land.
- symbol 13 shows the oil storage tank which is a fire site of a petroleum complex located several km from the water source 11.
- FIG. The submersible pump 14 is installed in the water source 11, and the submersible pump 14 is driven by an engine generator 15 installed on the land 12.
- a water pump 16 is installed on the land 12.
- the discharge port 17 of the submersible pump 14 and the suction port 18 of the water supply pump 16 are connected by a plurality of water supply hoses 19.
- each discharge port 17 and the suction port 18 have, for example, a 6-inch diameter, and are connected by four water-supply hoses 19 each having a length of 10 m and a length-adjusting 3 m.
- the water feed pump 16 is connected via a water feed path 21 to a pressure pump 20 installed at a land 12 near the oil storage tank 13 at the fire site and far from the water feed pump 16.
- the water feed pump 16 is provided with a plurality of, for example, four discharge ports 22, and the pressure pump 20 is also provided with a plurality of, for example, four suction ports 23.
- one end of four water hoses 24 each having a diameter of 6 inches and a length of 50 m is connected to each discharge port 22 of the water pump 16, and the other ends of these water hoses 24 are suction sides of the first manifold 25. It is connected to the.
- the first manifold 25 has an outlet diameter of 8 inches, and the first manifold 25 is connected to one end of two water hoses of length 1000 m.
- the other end of the water supply hose 26 is connected to the second manifold 27.
- the suction side of the second manifold 27 has a diameter of 6 inches, and one end of four water hoses 10 having a length of 10 m is connected to the discharge side, and the other ends of these water hoses 28 have pressure pumps 20 It is connected to the suction port 23.
- reference numeral 29 denotes a stock solution transport vehicle equipped with a tank 30 containing a foam extinguishing agent (stock solution) used for extinguishing the oil storage tank 13 during a fire, and the tank of the stock solution transport vehicle 29.
- a foam extinguishing agent stock solution
- One end of two rubber suction pipes 31 having a diameter of 3 inches and a length of 10 m is connected to 30 and the other end of the rubber suction pipe 31 is connected to the suction port 33 of the stock solution pump 32.
- the discharge port 34 of the undiluted solution pump 32 is connected to one end of two cloth hoses 35 each having a diameter of 2.5 inches and a length of 10 m, and the other end of these cloth hoses 35 is the pressure pump via the mixer 36
- the water sucked from the water source 11 is mixed with a foam extinguishing agent (stock solution) to be used at a dilution ratio of 1%, for example, to produce a foam extinguishing solution.
- the pressure pump 20 is provided with a plurality of, for example, four discharge ports 38.
- the manifold 40 of the foam spray can 39 is provided with a plurality of, for example, four connection fittings 41.
- four water hoses 42 having a length of 20 m are connected between the discharge ports 38 of the pressure pump 20 and the connection fittings (fittings) 41 on the suction side of the manifold 40 of the foam sprayer 39, for example. There is. Then, a large capacity foam is discharged from the foam water cannon 39 toward the fire site (oil storage tank) 13 to extinguish it.
- connection joint (joint fitting) 43 is provided at each end, and is detachably connected to the pumps via the connection joint 43.
- the number of water supply hoses 24, 28, 42 can be increased or decreased according to the status of the fire fighting activity.
- a connection joint (joint fitting) 43 is provided at the discharge ports 22 and 38 of the water pump 16 and the pressure pump 20 via a valve 44.
- connection joint 43 is broken to cause water leakage.
- the worker operating the water cannon 39 Reports the situation to the commander and the commander stops the rotation of the pump after stopping the rotation of the pump and stops it while the water pump 16 and the submersible pump 14 are stopped.
- the four valves 44 connected to the four hoses including the leaking water hose 42 are instructed to close.
- the pressure resistance of the water supply hoses 24, 26, 28, 42 and the like is increased to some extent on the assumption that the high pressure as described above is applied due to the failure of these operations.
- the water supply hoses 24, 26, 28, 42 having high pressure resistance become expensive, the weight of the water supply hose itself becomes heavy and hard, which causes a problem that the handling operation of the water supply hose becomes difficult.
- the water supply line is configured by connecting several tens of hoses.
- a safety valve is attached to the manifold etc. which are located near the pump with high fluid pressure.
- a valve such as a discharge port or a suction port
- the pressure on the water source side of the valve may increase to about 2 to 3 times during water supply.
- the water hammer tends to occur also due to lack of cooperation between the pumps.
- a large number of valves are attached at various places in the water supply line. Therefore, there was a possibility that a water hammer might occur everywhere on the water supply line.
- This safety-fitting joint (connection joint) 50 is shown in FIG.
- a safety valve pressure valve
- the branch pipe 52 is provided in the middle of the cylindrical joint metal fitting body 51 of the joint metal fitting 50 and the safety valve 80 described later is attached to the branch pipe 52, the branch pipe 52 and the safety valve 80 are the shafts of the joint metal fitting body 51. It is perpendicular to the direction, and has a T-shape as a whole.
- the coupling metal fittings 57a and 57b having the same structure are assembled at both ends of the coupling metal fitting body 51, and these coupling metal fittings 57a and 57b each have a cylinder main body 58.
- Each cylinder main body 58 has a cylindrical shape, and a seal member 59 such as rubber packing is attached to the outer end thereof.
- these coupling fittings 57a and 57b are fitted and coupled to each other in the axial direction with those of the other coupling fittings 50 having the same structure, but when this coupling is performed, the seal members 59 butt against each other
- the fluid passages 78 in the cylinder main bodies 58 communicate with each other while maintaining the sealing property to the outside.
- each of the coupling portion fittings 57a, 57b is provided with a coupling ring 61 fitted to the cylinder main body 58, and a plurality of, for example, nine fitting convex portions 70 project integrally at the outer end of the coupling ring 61. It is set up.
- the fitting projections 70 are arranged at equal intervals in the circumferential direction, and project outward in the axial direction from the seal member 59.
- An area between the fitting projections 70 is a fitting recess 71.
- the fitting projection 70 of one coupling fitting 57a is fitted into the fitting recess 71 of the other coupling fitting 57b, and the other
- the fitting convex portion 70 of the joint fitting 57b is fitted in the fitting recess 71 of the one joint fitting 67a, and is fitted in a complementary shape without male and female.
- a stepped hook-shaped locking collar 72 is formed on one side 70a of the fitting convex 70, and these locking ridges 72 are engaged with each other on the mating convex 70 on the other side. Engaging with the stopper 72 in the circumferential direction.
- biasing mechanisms 73 are provided on the side surfaces opposite to the side surfaces provided with the locking hooks 72 of the fitting convex portions 70 respectively.
- These biasing mechanisms 73 are composed of a steel ball 74 and a spring (not shown) that biases the steel ball 74 in the projecting direction. Therefore, when the fitting projections 70 are fitted in the mating fitting recess 71 on the other side, the steel balls 74 abut each other, press each other and urge each other, and the other side face of these fitting projections 70 Energize to move away from each other. As a result, the side surfaces of the fitting projections 70 on which the locking hooks 72 are provided are biased so as to approach each other, and the locking hooks 72 engage with each other.
- a safety valve (pressure valve) 80 as a safety valve mechanism is provided at the tip of the branch pipe 52 to discharge the internal fluid to the outside when the pressure in the branch pipe 52 exceeds the set pressure.
- the valve main body 81 of the safety valve 80 is detachably attached to the tip of the branch pipe 52 via a connector 82.
- the valve body 81 is provided with a member of a valve seat 84 projecting inward and a valve body 86. This valve body 86 opens when the pressure of the fluid passage 78 formed in the fitting 50 becomes abnormally high. , Open the fluid passage 78 to the outside.
- the valve body 86 is provided with a valve rod 87 projecting upward, and the valve rod 87 passes through the through hole 90 of the adjusting screw member 89 screwed to the female screw portion 88 formed on the top of the valve body 81
- the screw member 89 is supported so as to be movable back and forth in the axial direction.
- a coil spring 91 wound around a valve rod 87 is interposed between the lower surface of the adjusting screw member 89 and the upper surface of the valve body 86 in a compressed state, and the biasing force of the coil spring 91 turns the adjusting screw member 89. It can be adjusted by setting its vertical movement position. Thereby, the set pressure when the valve 86 is opened can be adjusted.
- the peripheral wall of the valve body 81 is provided with a relief hole 92 communicating with the outside, through which the fluid passage 78 can communicate with the outside.
- the joint metal fitting of Patent Document 1 is “a joint metal fitting for coupling pipes or pipes and other devices, and has a mounting portion for mounting the pipes at one end in an axial direction, The other end of the direction is a joint that can be connected to the joint metal fitting of the coupling partner, a coupling collar that engages with the locking collar part of the coupling partner, and an axial abutment to close the gap “A biasing mechanism for engaging the locking flanges with each other” is added to the fitting having the fluid passage formed inside, having a possible sealing surface, and only pressing the fitting in the axial direction Is a metal fitting that is automatically rotated and coupled.
- the joint metal fitting of Patent Document 2 is “a joint metal fitting for coupling pipes or pipes and other devices, and has a mounting portion for mounting the pipes at one end in an axial direction, and an axis
- the other end of the direction is a joint that can be connected to the joint metal fitting of the coupling partner, a coupling collar that engages with the locking collar part of the coupling partner, and an axial abutment to close the gap
- a lock fitting having a fluid passage formed in the inside, the lock face of the lock hook to be locked with the lock hook of the coupling partner of the joint,
- the load is partially inclined in an overhanging manner when an axial load is applied to separate the coupling fittings from each other in a state in which the hooks are engaged by inclining in an overhang shape with respect to the direction.
- Component in the circumferential direction according to the angle (counter angle ⁇ , the same applies hereinafter) In an attempt to further approach each other the locking hook in the circumferential direction, in which the locking hook has a
- the pressure within the working pressure of the hose and the fitting is strictly limited, and the “locking protrusion on which the locking ridge is formed when the very large load acts on the locking ridge for a long time Is flexed (folded and plastically deformed), and as a result, the locking surface of the locking ridge is formed with the locking ridge rather than the root closer to the fitting projection where the locking ridge is formed Opposite to the so-called overhang shape so that the tip farthest in the circumferential direction from the fitting projection is axially distant from the back wall surface of the fitting recess adjacent to the locking ridge portion of the fitting protrusion
- the locking surface wears more at the tip than at the root when it is inclined with respect to the circumferential direction.
- the locking surface is also That the overhanging were those for preventing the inclined would "be to as
- the tensile strength of 250 N / mm 2 of the material of at least any of the metal fittings, the joint portion and the joint portion described above As described above, in the case of the joint metal fitting made of an aluminum alloy forged product having an elongation of 15% or more, almost no shrinkage (plastic deformation) occurs even when used for a long period of time, and the locking projection is not bent. I understood.
- the inventor of the present application read the notification of the Fire Service Agency (Firefighting Application No. 204, October 28, 2013) and added an abnormal fluid pressure exceeding the working pressure and test pressure of the metal fitting even in the large capacity foam water cannon system. And realized that a metal fitting break accident may actually occur, and researched on a complete countermeasure against a newly assumed situation led to the present application.
- the safety-fitting connector of Patent Document 3 has a configuration in which a portion of the fitting body and a portion of the safety valve are arranged in a substantially T shape, and the portion of the safety valve is attached to the fitting body as a separate bulky mechanism. Accordingly, the entire fitting becomes large and bulky.
- the external shape is T-shaped, the vertical direction at the time of installation is also specified. Therefore, it is difficult to easily attach the safety fitting with the fitting on the water supply line everywhere.
- the safety valve portion is attached to the fitting body as a separate mechanical portion, there is a disadvantage that the manufacturing cost is increased.
- the coupling fitting 50 of this structure is disposed so as to wind the coil spring 91 on the outside (peripheral side) of the coupling fitting main body 51 without placing the coil spring 91 inside the coupling fitting main body 51. It was made to secure in 51 large.
- the coil spring 91 is disposed in the space between the outer periphery of the coupling fitting main body 51 and the inner periphery of the coupling ring 61.
- the rear end of the coil spring 91 abuts against a spring receiving member 99a screwed to the rear end of the coupling ring 61, and the front end of the coil spring 91 is raised on the outer periphery in the axial direction of the metal fitting main body 51 Butt was placed on 99b.
- a fitting convex portion 70 and a fitting concave portion 71 similar to those shown in FIG. 20 described above are formed.
- a portion of the axial tip portion 61a of the coupling ring 61 protrudes inward, and the portion of the tip portion 61a is disposed to abut on the front wall surface of the stopper wall 99b from the front. Then, since the fitting main body 51 is urged axially forward by the coil spring 91, the fitting main body 51 normally abuts on the axial distal end portion 61 a of the coupling ring 61 and stands by at the advanced position.
- the coupling ring 61 is provided only on one axial end side of the metal fitting main body 51, and the other axial end portion of the metal fitting main body 51 is a hose attachment portion 51a.
- the seal member 59 is disposed to the ring area portion of the tip end portion of the joint body 51. Further, the diameter of the tip ring area of the connector main body 51 serving as the valve body and the diameter of the portion as the valve portion of the seal member 59 can be increased, so that the diameter of the fluid passage 78 is increased, and the liquid flow rate can be secured. Since the fluid passage 78 can be made large, pressure loss can be reduced.
- the coil spring 91 must be made strong accordingly. Also, even if the material of the coil spring 91 is strengthened, the spring force weakens as the coil inner diameter (winding diameter) of the coil spring 91 is larger, so the wire diameter of the material of the coil spring 91 is sufficiently large. I can not cope. As a result, a large coil spring 91 is used, and even with this type of fitting, there remains a problem that the fitting becomes a rather heavy fitting and becomes large.
- this type of metal fitting 50 has the advantage of being simple and compact as a whole, as compared to the T-shaped type shown in FIG. Nevertheless, there is a drawback that weight reduction, simplification or compactness can not be made so that the conventional joint metal fitting can be replaced with the main joint metal fitting, and the cost remains high.
- the securement mechanism does not release even at the maximum pressure releasing the abnormal pressure.
- a fitting that does not disengage even at a sufficiently high pressure for the working pressure of the fitting is desired.
- a metal fitting that does not separate even at a sufficiently high pressure with respect to the test pressure of the metal fitting is desired.
- a worker is warned of an abnormal situation by a fluid that is ejected when the fluid is leaked and the pressure is reduced while maintaining the coupling state of the fitting. Is also desired.
- the invention according to claim 1 is a fitting for coupling tubes or tubes with other devices, which has a mounting portion for mounting the tubes at one end in the axial direction,
- the other end part is a joint that can be connected with the joint metal of the mating partner, the joint is a hook that locks with the mating hook of the mating partner, and can axially close and close the gap
- a sealing surface and a fluid passage formed in the inside wherein the locking surface of the locking collar is inclined in an overhanging manner with respect to the circumferential direction, and the locking collar is engaged
- a part of the load acts as a component of force in the circumferential direction according to a predetermined angle inclined in the overhang shape, and the locking ridge portion in the engaged state
- the angle of the locking surface is negative even when an abnormal load in the axial direction is exerted when the pressure of the fluid abnormally rises to the breaking pressure of the
- the invention according to claim 2 is a fitting for coupling tubes or tubes with other devices, having an attaching portion for attaching the tubes or other devices at one end in an axial direction, And a mounting portion for attaching to the connector body at one end side portion in the axial direction, and the other end side portion in the axial direction can be connected to the connection metal fitting of the coupling partner
- the sealing surface is separated from the mating mating seal surface by being axially stretched by an abnormal tensile force applied to the coupling body when the pressure of the fluid in the coupling fitting body abnormally rises.
- the locking surface of the locking ridge that locks with the locking ridge of the coupling partner of the coupling portion is inclined in an overhanging manner with respect to the circumferential direction, and the angle of the locking surface is Until the pressure is abnormally increased and the deformed portion is extended, and the seal surface separates to form a leak path for discharging the fluid, the locking flange remains within a range of non-negative angles. It is a metal fitting which maintains the mutually locked state. According to the invention of claim 3, the angle does not become negative even when the load in the axial direction when the fluid pressure abnormally rises to three times the fitting working pressure acts and the joint portion is deformed.
- the metal fitting according to claim 1 or claim 2 which is in the range of an angle.
- the invention according to claim 4 is in an angle range in which the angle does not become negative even when an axial load is applied when the fluid pressure rises to the test pressure of the fitting and the joint is deformed.
- the invention of claim 5 is characterized in that the material of at least one of the joint metal, the joint body and the joint portion is an aluminum alloy forged product having a tensile strength of 250 N / mm 2 or more and an elongation of 15% or more, and the angle is 20 °.
- the present invention even if the tube and fittings such as the fitting and hose are subjected to abnormal high pressure due to any cause during use, the necessary amount of leak path is opened in the seal of the fitting itself while maintaining the coupled state in the fitting. Or to avoid breakage of heavy and hard metal fittings at high speeds by breaking the connecting metal fittings, breaking light and soft, relatively safe hoses, etc., and reducing pressure by The purpose is to enhance the safety of the entire system for people.
- the present invention also provides a fitting that can warn an operator or the like of the occurrence of an abnormal situation by the fluid discharged from the leak path.
- the conventional metal fitting can be economically replaced with the conventional metal fitting by supplying the metal fitting as light and compact as possible, and supplying the same cost with the conventional metal fitting by a simple structure.
- safety is given the top priority, and it is considered under the condition that “the safety valve does not have to be returned to the original state when the safety valve is operated at an abnormal pressure”.
- liquid such as water or seawater
- the metal fitting of the present invention is all the couplings used for one pumping system by hose etc. It can be assumed to be used for fittings or main fittings.
- a fitting for the large-capacity foam water discharge system it is assumed that at least 10 or more sets of this fitting are used (10 sets of connecting fittings in the case of using 2 rows of 4-connected hoses in parallel). it can.
- the leak path is formed in the seal part of the fitting itself while maintaining the coupled state in the fitting.
- the necessary amount of opening or breakage of the metal fitting due to breakage of the metal fitting at high speed is avoided, and light and soft relatively safe hoses are broken to reduce pressure, thereby Ensure safety.
- the fluid jet port for causing the fluid to be ejected from the leak path formed between the seal member which separates from the seal member of the coupling partner and the seal member of the coupling partner when the pressure of the fluid abnormally increases
- the apparatus provided in the main part of the unit, by ejecting the fluid discharged from the leak path from the fluid jet port, an abnormal situation can be realized and a worker or the like can be warned.
- FIG. 1 is a side view showing a part of a pair of metal fittings of one embodiment in cross section.
- FIG. 2 is explanatory drawing which shows the structure of the coupling
- (A) and (b) of FIG. 3 are explanatory drawings showing the state of the connecting part when connecting the connecting fitting in the same embodiment.
- FIG. 4 is an explanatory view showing the vicinity of the joint portion and the seal portion in a state in which the joint portion of the joint metal fitting is coupled to the pair in the same embodiment.
- FIG. 5 is an explanatory view showing a state in the vicinity of the joint portion and the seal portion in the state in which the safety function of the joint metal fitting is operated in the same embodiment.
- FIG. 1 is a side view showing a part of a pair of metal fittings of one embodiment in cross section.
- FIG. 2 is explanatory drawing which shows the structure of the coupling
- FIG. 6 is an explanatory view showing a state in which a crack or the like is inserted in the root portion of the locking collar portion having no notch hole.
- FIG. 7A is a cross-sectional view showing the vicinity of the seal member in the case where a pair of metal fittings are joined in the same embodiment.
- FIG. 7B is a cross-sectional view showing the vicinity of the seal member during fluid transfer by connecting a pair of metal fittings in the same embodiment.
- FIG. 7C is a cross-sectional view showing the vicinity of the seal member when releasing an abnormal and excessive pressure fluid in use in which a pair of metal fittings are connected in the same embodiment.
- FIG. 7A is a cross-sectional view showing the vicinity of the seal member in the case where a pair of metal fittings are joined in the same embodiment.
- FIG. 7B is a cross-sectional view showing the vicinity of the seal member during fluid transfer by connecting a pair of metal fittings in the same embodiment.
- FIG. 7C is a cross-sectional
- FIG. 7D is a cross-sectional view showing the seal member and the seal ring portion after releasing an abnormal and excessive pressure fluid in use in which a pair of metal fittings are connected in the same embodiment.
- FIG. 8 shows, in the same embodiment, a modification of a pair of fittings in the case where one fitting is provided in the manifold closest to the water gun of the large-volume foam radiation system
- FIG. 9 is an explanatory view showing a modified example in the vicinity of the coupling portion when the coupling metal fittings are coupled to each other in the same embodiment.
- FIG. 10 is an explanatory view showing the vicinity of the joint portion and the seal portion in the state shown in FIG. 9 in which the safety function of the joint metal fitting is also activated.
- FIG. 11 show the example in the said embodiment, and are the design which showed the shape and dimension of the sample corresponding to the form of a metal fitting body in cross section the one part.
- 12 is a cross-sectional view showing the vicinity of the sealing member fitting groove in FIG. 11 in an enlarged manner.
- FIG. 13 is a design drawing showing the shape and dimensions of a pull rod which is a test jig attached to a sample in the same embodiment.
- FIG. 14 is a design drawing in which the joint of the test piece corresponding to the form of the joint main body in the example is expanded in the range of 30 ° to show the shape and dimensions in that part, and a part of it is shown in cross section is there.
- FIG. 15 is a design drawing showing the shape and dimensions of the seal member of the test piece in the same example.
- FIG. 16 is a graph showing the test results of the test specimen automatically calculated as the tensile load and the displacement (displacement between chucks).
- FIG. 17 is a graph showing data of tensile load and displacement between seal rings in the test results of the specimen.
- FIG. 18A is an explanatory view showing a tensile load of 2 kN and a deformed state of the connecting portion at that time when the test of the specimen is conducted in the same manner.
- FIG. 18B is an explanatory view showing a main tensile load of 91 kN when the test of the specimen is performed and a deformed state of the joint portion at that time.
- FIG. 18C is an explanatory view showing a tensile load of 210 kN when a test of the specimen is performed and a deformed state of the connecting portion at that time.
- FIG. 18D is an explanatory view showing a tensile load of 300 kN when the test of the specimen is conducted and a deformed state of the joint portion at that time.
- FIG. 18E is an explanatory view showing a tensile load of 400 kN when a test of the specimen is conducted and a deformed state of the joint portion at that time.
- FIG. 18F is an explanatory view showing a main tensile load of 440 kN and a deformation state of a connecting portion at that time when a test of the specimen is performed.
- FIG. 19 is an explanatory view showing a schematic configuration of a large capacity foam water discharge system.
- FIG. 20 is a side view showing a cross section of a part of the safety valve mechanism attached fitting.
- FIG. 21 is a side view showing, in cross section, a part of an example in which the safety valve mechanism-attached fitting is further improved.
- FIG. 1 is a side view of a pair of metal fittings used as a connection joint for connecting pipes such as hoses in the high-capacity foam water discharge system described above, for example.
- FIG. 2 is a joint of the pair of metal fittings in a coupled state FIG.
- the pair of metal fittings 100 has the same structure in which the front and rear sides are reversed, and the joint 110 described later has the same structure without sex distinction.
- Each coupling fitting 100 is provided with a coupling fitting main body 101 formed of a substantially cylindrical tubular member.
- the metal fitting body 101 is made of, for example, a metal material such as an aluminum alloy or a titanium alloy into a rough shape by forging, drawing, extrusion, or the like, and is integrally manufactured by finishing this material by cutting or the like. Since cast products such as ordinary castings generally have low elongation and poor toughness, they are often unsuitable. In this embodiment, cast products such as ordinary castings are not used for the fitting body 101.
- the space in the tubular portion of the fitting body 101 is a fluid passage 102 along the central axis O of the fitting body 101.
- Irregularities are formed on the outer periphery of one axial end of the fitting body 101 (the end positioned on the rear side when the coupling portion 110 is forward), and this portion is attached for attaching a tube such as a hose.
- the section 103 When the hoses are attached to the attachment portion 103, the hoses are fitted to the attachment portion 103, and the hoses are fastened and fixed with a binding (not shown) or the like.
- a substantially cylindrical coupling portion main body 105 is fitted on the coupling bracket main body 101 on the other end of the coupling fitting main body 101, that is, an end outer peripheral surface located on the front side facing the coupling portion of the mating coupling fitting to be coupled. It is attached in the state which
- the material of the connecting portion main body 105 is also made of, for example, a metal material such as an aluminum alloy or a titanium alloy in the same manner as the material of the connecting bracket main body 101.
- the joint portion main body 105 is formed into an approximate shape by forging, drawing, extrusion or the like including the portion of the joint portion 110 described later, and is integrally manufactured by finishing this object by cutting or the like.
- Casting products such as ordinary castings are not suitable because they are generally unsuitable because they have low elongation and poor toughness. Therefore, as with the case of the metal fitting main body 101, casting products such as ordinary castings are not used.
- the material of the metal fitting main body 101 and the bonding portion main body 105 in particular, the material of the bonding portion main body 105 have an elongation of 10% or more. Therefore, A5056TE of JIS H 4140-1988 “Aluminum or aluminum alloy forged product” is used as the material of the joint metal main body 101 and the joint portion main body 105 in the present embodiment, and the measured value is the tensile strength of 321 N / mm 2 , elongation 22%.
- a rear end portion of the coupling portion main body 105 located on the rear side is an attaching portion for attaching to the coupling fitting main body 101 .
- a female screw portion 106 is formed on the inner periphery of the rear end portion.
- a male screw portion 107 is formed on the outer periphery of the middle portion of the fitting main body 101 corresponding to the female screw portion 106. Then, the coupling portion main body 105 is fixedly attached to the coupling fitting main body 101 by screwing the female screw portion 106 with the male screw portion 107.
- the internal thread portion 106 is formed on the inner surface of the projecting edge portion 108 which is formed so as to protrude slightly inward of the other inner surface of the coupling portion main body 105. Further, the outer peripheral portion of the fitting main body 101 positioned corresponding to the projecting edge portion 108 is formed to have a small diameter as the projecting edge portion 108 protrudes inward, whereby the outer peripheral portion of the fitting main body 101 is stepped The part 109 is formed. The male screw portion 107 is formed on the bottom of the step 109. Therefore, as shown in FIG.
- the projecting edge portion 108 of the coupling portion main body 105 is at the coupling fitting main body 101 at a position where the internal thread portion 106 of the coupling portion main body 105 is screwed and attached to the external thread portion 107 of the coupling fitting main body 101.
- the rising wall of the step portion 109 abuts, and simultaneously with the axial positioning of the coupling portion body 105 with respect to the fitting body 101, forward movement is blocked.
- the coupling portion main body 105 may be mounted in a manner capable of rotating around the axis of the coupling fitting main body 101.
- metal fitting does not mean to be specified as a metal material.
- the term "metal fitting” is used in a functional sense, and even if it is a material other than metal, if it can be used in characteristics such as strength, the material other than metal, for example, fiber reinforcement It also includes composite materials such as resin.
- a coupling portion 110 is formed at the front end of the pair of coupling portion main bodies 105.
- the connecting portions 110 have the same structure without distinction between male and female, and have mutually complementary structures.
- the coupling portions 110 are integrally formed with the respective coupling portion bodies 105.
- the coupling portion main body 105 and the members of the coupling portion 110 are integrated, they may be configured by separate members to couple the two.
- a plurality of, for example, twelve fitting projections 111 are integrally projected at the front end of the coupling unit main body 105 at equal intervals in the circumferential direction as shown in FIG. A space between them is a fitting recess 112. Therefore, the set of the fitting protrusion 111 and the fitting recess 112 is provided in the range of 30 °, and 12 sets are arranged over the entire circumference.
- the fitting projection 111 of one coupling portion main body 105 is fitted in the fitting recess 112 of the coupling portion main body 105 of the coupling partner.
- the fitting projections 111 of the coupling portion main body 105 of the coupling partner are fitted in the fitting concave portions 112 of the coupling portion main body 105 and are fitted complementarily to each other.
- the circumferential width of the fitting recess 112 is formed slightly wider than the width of the fitting protrusion 111 at the same position. Therefore, as shown in FIG. 2, these fitting projections 111 can be rotated in the circumferential direction by a predetermined amount (G 2) in the mating fitting recess 112.
- the side surface 111 a located on one side in the circumferential direction of the fitting protrusion 111 is formed as a surface substantially parallel to the axial direction of the coupling portion main body 105.
- the side surface 111b positioned on the other side in the direction is formed so as to be inclined so that the tip of the fitting protrusion 111 is narrowed with respect to the axial direction of the coupling portion main body 105. That is, each fitting protrusion 111 forms a gradient in which the width in the circumferential direction becomes narrower toward the tip end side on one side surface.
- the fitting concave portion 112 is configured such that the width in the circumferential direction becomes narrower as it goes to the back portion in accordance with the shape of the fitting protrusion 111 to be fitted thereto.
- a gap G1 is formed between the tip end surface of the fitting protrusion 111 and the back wall surface of the fitting recess 112 in a state where the fitting protrusion 111 and the fitting recess 112 of the coupling partner fit together. It is formed. Therefore, even if the locking hooks 113 are inclined in an overhanging manner, the locking hooks 113 can be easily disengaged.
- the gap G2 is also formed between the back surface of the fitting protrusion 111 and the back surface of the fitting recess 112, the engagement between the locking hooks 113 described later and the engagement thereof will be described. It is possible to secure the distance from the retracted position where it can be removed. Further, the fitting projection 111 and the fitting recess 112 can be made to axially enter and rotate around the axis beyond the position where the locking hook 113 engages with each other. Therefore, the engagement hooks 113 can be easily engaged and disengaged with each other.
- a stepped hook-shaped locking collar 113 is provided on the side surface 111 a of one of the fitting protrusions 111 (one formed substantially in parallel with the axial direction of the coupling portion main body 105). It is formed. These locking hooks 113 fit the fitting projection 111 into the mating fitting recess 112 on the other side all the way, and in this state, the coupling unit main body 105 is rotated in the circumferential direction to each other. You will be able to take it off. That is, by bringing the pair of locking hooks 113 close to each other, the corresponding locking hooks 113 engage with each other in the circumferential direction and lock as shown in FIG. Then, the coupling portions 110 are coupled so as not to be separated in the axial direction.
- the locking surface 113 a of the locking collar 113 is inclined in an overhanging manner at a predetermined angle with respect to the circumferential direction of the coupling portion main body 105, and thus the locking surface By inclining the 113a, the engagement force of meshing in a state in which the pair of locking hooks 113 engage with each other is increased.
- a rounded notch hole (curved portion) 115 for preventing stress concentration is formed at the root of each locking flange portion 113.
- the opening area of the notch hole 115 is a fluid ejection port 116 which exerts a fluid ejection function described later.
- the front end corner portion of the fitting protrusion 111 is also formed in an arc shape, and the arc-shaped portion becomes a guide portion 117 when fitting with the fitting recess 112.
- the root portion of the fitting recess 112 likewise forms an arc-shaped roundness 118.
- the guide portion 117 and the roundness 118 guide the engagement between the fitting protrusion 111 and the fitting recess 112 when the fitting protrusion 111 and the fitting recess 112 are in contact with each other when fitting. Play a function. Further, the guide portion 117 and the roundness 118 prevent stress concentration at the root portion of each locking flange portion 113, and the strength of the connecting portion 110 including the fitting protrusion 111 including the locking ridge portion 113 and the fitting recess 112 is obtained. Increase.
- a biasing mechanism 120 described later is provided at a portion of the other inclined side surface 111 b of the fitting protrusion 111.
- the biasing mechanism 120 includes a biasing member, for example, a steel ball 125 accommodated in a cylindrical case member 124 so as to be able to project and retract, and a spring 126 for biasing the steel ball 125 in a direction to project. It constitutes a ball plunger.
- a biasing member for example, a steel ball 125 accommodated in a cylindrical case member 124 so as to be able to project and retract
- a spring 126 for biasing the steel ball 125 in a direction to project. It constitutes a ball plunger.
- a part of the steel ball 125 is disposed so as to protrude from the side surface 111b, as shown in FIG.
- a seal ring portion 131 is integrally formed with a member of the fitting main body 101 at the front end portion of the fitting main body 101.
- the seal ring portion 131 is formed so as to turn around the axis of the fitting main body 101 with a seal member fitting groove 132 opened forward in the axial direction. Further, the seal member fitting groove 132 is disposed concentrically with the axis of the fitting main body 101.
- the coupling fitting main body 101 and the seal ring portion 131 are integrally formed, but the sealing member attaching member is provided to be attached to the coupling fitting main body 101 as a separate member from the coupling fitting main body 101
- the fitting groove 132 may be formed.
- An annular seal member 133 made of an elastic material is attached to the seal member fitting groove 132.
- the seal member 133 here is a lip seal type. Then, a base portion 133a which is a part of the seal member 133 is inserted into the inset groove 132, and the seal member 133 is fitted into the inset groove 132 so that the seal member 133 is attached to the inset groove 132. Further, as shown in FIG. 7A, the seal member 133 has a lip-like tip 133b extending forward and inward from the base 133a, and the surface facing the front of the lip-like tip 133b The contact surface (abutment surface) 133c faces the lip-like tip end portion 133b of the connector fitting.
- the contact surface 133c of the lip-like tip portion 133b is formed in a tapered shape inclined so that the inner side in the radial direction protrudes more forward (FIG. 7D is in a free state).
- a free state such as before connecting the metal fitting 100 to another metal fitting 100
- the inward side of the contact surface 133c is tapered so that the inner side protrudes further forward.
- FIG. 7A in the state in which the pair of metal fittings 100 are joined, only the vicinity of the tip of the contact surface 133b is abutted, and the vicinity of the foremost end (inner side in the radial direction) Become.
- the state of the lip-like tip portion 133b as shown in FIG. 7A is the assembly position of the pair of metal fittings 100, and is also in a standby state before fluid transfer.
- the pressure (for example, 1.3 MPa) of fluid is applied to the lip-like tip 133b from the inside, and the lip-like tip 133b is pushed outward as shown in FIG. Accordingly, the contact surfaces 133c are strongly butted against each other, and the sealability is enhanced. Further, when the lip-like tip end portion 133b is in the closed state as described above, the contact surfaces 133c near the top (inward in the radial direction) of the lip-like tip end portion 133b contact with each other with the strongest surface pressure. It prevents the leakage of fluid flowing out from between the tips 133b.
- the inner region portion corresponding to the portion where the lip-like tip portion 133b bends inward is retracted relative to the outer peripheral region portion of the fitting body. ing. This secures a space area for the lip tip portion 133b to bend inward.
- the outer region of the opening edge of the inset groove 132 forms a receiving portion 132c for receiving the waist portion of the lip-like tip portion 133a.
- a protrusion 132d is formed which protrudes toward the center of the opening.
- the protrusion 132 d prevents the base portion 133 a of the seal member 133 fitted in the fitting groove 132 from coming off.
- the protrusion 132 d may be formed in an annular shape over the entire periphery of the opening periphery of the fitting groove 132 or may be partially provided at the opening periphery.
- the relationship between the seal member 133 of one joint fitting 100 becomes a valve seat when the seal member 133 of the other joint fitting 100 to be joined is viewed as a valve body and the valve body when the other seal member 133 is viewed as a valve seat It is in. That is, the seal members 133 are in a complementary relationship between the valve body and the valve seat of the safety valve.
- Each seal member 133 has the same shape and operates as a safety valve function portion 134 of a valve structure in which these seal members 133 are butted against each other. Further, it can also be considered that the seal ring portion 131 and the seal member 133 are integrated and both become a valve body or a valve seat.
- Each seal member 133 is also a seal portion when the pair of metal fittings 100 are coupled to each other.
- the abutment position at which the contact surfaces (seal surfaces) 133c of the seal members 133 butt abut each other is located in the middle of the fitting part in the middle of the portion 111 and the fitting recess 112. Moreover, this position is also at the center of the locking area of the locking surface 133 a of the locking hook 113. That is, as shown in FIG. 2, the central portions of the pair of locking hooks 113 engaged with each other and the abutting surfaces of the contact surfaces 133c of the sealing members 133 in contact with each other coincide with each other.
- the engaged portion of the pair of locking hooks 113 is located in the middle of the pair of fluid jet outlets 116 formed by the notched holes (curved portions) 115 of the pair of locking hooks 113. Furthermore, the surface with which the contact surface 133 c of each seal member 133 abuts is located at a position across the gap G 2 formed between the back surface of the fitting protrusion 111 and the back surface of the fitting recess 112.
- the steel ball 125 of the biasing mechanism 120 is located in this gap G2, but when the pressure of the fluid to be transferred becomes abnormal and becomes excessively high pressure and the pressure fluid is discharged from the leak path 138, the steel ball 125 is released It is pushed into the case member 124 against the biasing force of the spring 126 by the force of the fluid (mainly dynamic pressure) to secure the effective area of the fluid jet in the portion of the gap G2.
- the fluid mainly dynamic pressure
- a deformation portion 140 is formed in a portion of the coupling portion 110 where the fitting projection 111 is formed, utilizing this portion, and the deformation portion 140 is mainly in the axial direction of the entire coupling portion 110 by plastic deformation. It is formed to extend.
- the deformation portion 140 is axially moved to the joint 110. A stretching deformation is supposed to occur.
- fitting protrusion 111 is provided with the locking collar 113 at a position biased to one side and this locking collar 113 is locked to the other locking collar 113, as shown in FIG.
- the fitting projections 111 extend in the axial direction while slightly bending the entire locking hook 113 while maintaining the locking hooks 113 in a mutually locked state. That is, at the stage of the range in which the locking flanges 113 maintain the engagement state, the whole of the fitting protrusion 111 is deformed and stretched, and the locking state by the locking flanges 113 is broken or the like.
- the coupling portion 110 is deformed so as to extend in the axial direction without being released.
- a rounded notch hole (curved portion at the root portion of the locking ridge portion 113) Section 115 is formed to avoid stress concentration on a local portion of the root of the locking hook 113 and prevent the locking hook 113 from being broken. Further, since the notch hole 115 forms one of the fluid jet ports 142, it also becomes a large notch hole.
- the seal member 133 as the valve body retracts away from the other seal member 133 by the deformation portion 140 extending in the axial direction, and the leak path 138 is formed between the seal members 133.
- the leak path 138 is formed between the seal members 133.
- it was made to form it was arranged so that at least one copy of fluid jet 142 might overlap with the field of leak way 138 further.
- part of the area of the leak path 138 is positioned correspondingly.
- the portion of the gap G2 can also be viewed as the fluid jet 142.
- the engaging surface of the locking hook 113 is axially engaged with the engaging surface of the locking hook 113 of the mating fitting in the axial direction.
- the coupling force by the locking is transmitted from the coupling portion 110 to the coupling portion main body 105 and further to the coupling fitting main body 101.
- the fitting projection 111 is tapered such that the width thereof is wider toward the proximal end side, that is, toward the coupling portion main body 105, stress concentration on the proximal end portion of the coupling portion 110 can be avoided. Further, if the protrusion length of the fitting protrusion 111 is made longer, the distal end side area for supporting the locking collar 113 is secured by the lengthening, and the strength of the locking collar 113 receiving the tensile load is increased. In addition, by increasing the area from the root of the fitting projection 111 to the engagement position of the locking hook 113, the lift amount of the seal member 133 can be increased even if the material of the same elongation is used. As a safety valve function, it is possible to secure a sufficient amount of leaked water.
- the locking surface 113a of the locking flange 113 is inclined in an overhanging manner with respect to the circumferential direction of the coupling body, and the counter angle “ ⁇ " is set larger than in the case of the existing metal fitting.
- the counter angle “ ⁇ ” on the outer peripheral surface development view is larger than 15 ° in the case of the existing metal fitting, for example, a range of 20 ° to 30 ° is preferable, and 25 ° is more preferable.
- the counter angle ⁇ is smaller than 20 °, as shown in FIG. 5, when the leak path 138 of the safety valve 134 is formed, the angle of the locking surface 113a with which the pair of locking flanges 113 contact with each other. Tends to deviate from the position perpendicular to the axial direction of the fitting.
- the counter angle ⁇ is larger than 30 °, it is necessary to increase the gap G1 between the end surface of the fitting protrusion 111 and the back wall surface of the fitting recess 112, and the metal fitting can not be designed compactly. It is easy to cause trouble at the time of operation.
- the counter angle ⁇ is about 20 ° to 30 °
- the pressure of the fluid in the fitting main body is abnormally increased, it is axially stretched by an axial tensile force applied to the coupling portion main body.
- the sealing member forms a leak path for releasing the fluid by separating from the sealing member of the mating partner, and the locking ridge portion having the locking surface is deformed so that the angle does not become negative even if the locking ridge portion is deformed
- the engagement between the locking hooks is secured. That is, the angle of the locking surface inclined in an overhang shape is extended in the axial direction by the axial tensile force applied to the coupling body when the pressure of the fluid in the fitting main body is abnormally increased.
- the locking ridge portion having the locking surface is deformed until the sealing member forms a leak path for releasing the fluid by being separated from the sealing member of the mating partner, and the angle is not in the range of negative angles. And it is an angle which maintains the state which the latching collar part mutually locked. Further, the locking hooks can be guided to the locking state most smoothly, and at the same time, the engagement releasing operation between the locking hooks can be easily performed.
- the conventional joint metal fitting it is used within the working pressure (the maximum working pressure for normal use) after temporarily receiving the test pressure (1.5 to 2.0 times the working pressure in shipping inspection etc.) Therefore, the bending of the fitting projection 111 when subjected to pressure remains at the bending due to very slight elastic deformation, and returns to the original shape (angle) when the pressure is removed. Therefore, the counter angle of the coupling fitting 100 so far has been set to a counter angle of about 15 °.
- a pressure receiving an abnormal high pressure (3 to 4 times or more of the working pressure) exceeding the test pressure is also assumed. It is assumed that the pressure has a sufficient margin to the normal working pressure.
- the load in the axial direction is increased, and the fitting protrusion 111 extends in the axial direction while being bent by plastic deformation or elastic deformation, and the locking flange 113 is also deformed.
- the counter angle ⁇ is reduced by the amount of bending and deformation.
- the counter angle ⁇ is designed to be larger in anticipation of the decrease in the counter angle ⁇ . And even if it is slightly changed depending on the material and size of the metal fitting or its shape etc., if the counter angle ⁇ of 20 ° to 30 ° is provided, it is also applicable to the metal fitting for large capacity foam water discharge system (namely 150 to 400 mm) become able to.
- the deformation part 140 (joint part 110) is slightly bent by plastic deformation and the whole is made axially. To grow. Then, the seal ring portions 131 of the pair of metal fittings 100 are lifted away from each other, the space between the butting surfaces of the seal members 133 is opened, and the leak path 138 is formed between the seal members 133. The high pressure fluid in the fluid passage 102 is discharged out through the leak passage 138.
- the discharge fluid is vigorously ejected from the fluid jet port 142 in the circumferential direction of the fitting 100 (in the case of a 300 mm metal fitting, the circumferential 12 direction or the circumferential 24 direction). Then, when this squirting phenomenon occurs, workers etc. can see it and know that it is an abnormal situation.
- the seal member 133 When the fluid is discharged, the seal member 133 is positioned at the fluid jet port 142. However, since the seal member 133 is usually made of rubber, the seal member 133 is pressed by the strong fluid and the influence on the water discharge amount is small. Also, although the steel ball 125 of the biasing mechanism 120 is located in the leak path 138, the steel ball 125 is pushed into the case member 124 by the strong jet fluid and is evacuated as much as possible from the fluid jet port area. There is no significant loss of water volume.
- FIG. 8 shows a case where one of the pair of metal fittings is the metal fitting 100a provided in the manifold 40 closest to the water discharge gun 39 in the large-capacity foam radiation system shown in FIG. 19, and the pair of metal fittings described above This is an example in which the safety fitting with a safety mechanism 100 is used.
- the coupling portion main body 105 since the coupling portion main body 105 is fixed to the coupling fitting main body 101, only the coupling portion main body 105 can not be rotated independently, but the coupling portion main body 105 can be rotated to the coupling fitting main body 101. If it has a structure of attaching to a pair of coupling fittings 100, only the coupling part main body 105 can be rotated.
- each sealing member 133 of a pair of metal fittings 100 contact
- the crests of the lip-like distal end portions 133b of the seal members 133 are in a state of being in contact with each other and in contact with each other.
- the internal pressure (fluid pressure) at the normal time which transfers fluid as shown in FIG. 7B, each lip-like tip 133b is pushed outward from the inside by the pressure, so the sealing contact surface 133c is entirely
- the sealing member 133 is in a sealing state in which the sealing member 133 is closed.
- the relationship between the working pressure of the fitting (the maximum working pressure normally used, which is usually indicated on the fitting; hereinafter, this explanation is omitted) and the abnormal pressure value assumed in the present invention depends on the system in which the fitting is used.
- the working pressure (fluid pressure) in the fluid passage 102 at the time of fluid transfer is about 1.0 to 1.6 MPa.
- the test pressure is about 1.5 to 2.4 MPa.
- the test pressure is about 1.5 to 2 times the working pressure
- the abnormal pressure value assumed in the present invention is about 2 times the test pressure (about 3 to 4 times the working pressure). ing.
- the fitting is used as a connection fitting for connecting pipes such as hoses in a high capacity foam water discharge system.
- the working pressure of the nominal 300 mm metal fitting is 1.3 MPa, and the test pressure is 1.5 times the working pressure (2.0 MPa).
- the breaking pressure of this hose body is less than 2.5 times the working pressure (3.0 MPa), and the abnormal pressure value in the safety valve function of this fitting is about 3.0 times the working pressure (3.9 MPa) Set.
- the reason for providing a large margin of 0.9 MPa for the rupture pressure of the hose is that the safety valve function is activated and this metal fitting is performed despite the fact that the worst situation where the metal fitting is broken and the fitting is broken is not approaching In order to avoid the plastic deformation of the deformed portion 140 of FIG.
- the seal member 133 when the pair of coupling fittings 100 are connected is in the state shown in FIG. 7A. Further, at the time of fluid transfer, the state shown in FIG. 7B is obtained, and the vicinity of the inward tip end of the contact surface 133c is the strongest, and the substantially entire contact surface 133c is pressed. The pressing force between the seal members 133 is correspondingly increased according to the pressure of the transfer fluid.
- the pressure (fluid pressure) value in the fluid passage 102 is extremely increased for some reason and becomes an abnormal pressure that is more than a certain level, the tensile force to be pulled apart in the pair of metal fittings 100 becomes strong according to the pressure.
- the axial tensile force is transmitted from the fitting body 101 to the coupling portion 110 of the coupling portion body 105.
- the deformation portion 140 extends in the axial direction. The most deformable deformation portion 140 is first stretched in the axial direction, but the other portions other than the deformation portion 140 do not relatively stretch substantially even under tensile load.
- the seal member 133 located at the front end of the joint metal main body 101 is retracted relative to the joint portion 110, and the seal state shown in FIG. It changes to the open state shown in FIG. In other words, all the seal members 133 retract relative to the coupling portion 110. (From a different point of view, the locking portion of the connecting portion 110 is advanced relative to the sealing member 133.)
- the amount of retraction R of the seal member 133 at this time corresponds to the amount of extension of the deformation portion 140 in the axial direction (see FIG. 5). Then, the seal members 133 of the pair of metal fitting main bodies 101 are separated from each other to form a leak path 138 by a gap formed therebetween.
- the amount of retraction R is the same, and the distance L by which the seal members 133 in the pair of fittings 100 are relatively separated is the sum of the amounts of retraction R ((1) See Figure 5). Then, when an abnormal and excessive fluid pressure is generated, a leak passage 138 having a width (L) of 2R appears between the seal members 133, and the leak passage 138 communicates with the fluid passage 102 of the fitting body 101. Therefore, the abnormally large pressure fluid in the fluid passage 102 is discharged out of the fitting 100 through the leak passage 138.
- tip part 133b of each sealing member 133 is twisted with the force of the water flow discharged
- the leak path 138 continues to be formed by the gap formed between the lip-like tips 133b, and the high pressure fluid is discharged to the outside of the metal fitting 100 as long as an abnormal and excessive high pressure fluid remains.
- the fluid pressure in the fluid passage 102 drops sharply. Then, the abnormal pressure is quickly reduced to the working pressure or less, the abnormal pressure state is eliminated, and the pressure state is further increased, and the connection state of the metal fitting 100 is not broken.
- the safety valve function works, and the high pressure fluid in the fluid passage 102 flows out through the leak passage 138 and the fluid pressure in the fluid passage 102 Reduce. For this reason, the connecting portion 110 and the like are not damaged or damaged. Further, the pair of coupling fittings 100 maintain the coupled state.
- the deformation portion 140 When the fluid in the fluid passage 102 is abnormally high and is in an excessively high pressure state, the deformation portion 140 preferentially extends at a stage where the connection with the connection partner by the connection portion 110 is maintained, and each seal member Forming the leak path 138 between 133, that is, the safety valve function unit 134 functions as a safety valve (pressure valve). And the danger of the metal fitting detachment by the fracture
- the extension characteristic of the deformation portion 140 of the coupling portion main body 105 is obtained by comparing the valve body and valve seat (seal surface) of the seal member 133 with the valve body and valve seat (seal surface) of the seal member 133 on the opposite side.
- the deformation portion 140 is set so as to extend in the axial direction without breaking the coupling of the coupling portion 110 until the total lift amount away from a) becomes 1/100 or more of the minimum inner diameter of the fluid channel 102 of the coupling fitting 100 .
- the flow passage area (curtain area) of the leak passage 138 on the valve body and the valve seat surface is 4% or more of the flow passage area of piping such as a hose connected to the fitting 100.
- the “lift-type safety valve” defined in JIS B 8210-2009, it is defined that the lift is 1/40 or more. Means that it is 10% or more of the flow passage area (valve seat area) of pipings such as hoses connected to the connection fitting 100 in this case. Therefore, the discharge area of the safety valve for alarm alone is 2/5 of that of the above-mentioned JIS lift safety valve. If only the flow path area (curtain area) of the leak path 138 is considered, the release area more than the JIS lift safety valve can be secured if three sets of alarm safety valves in this embodiment are operated.
- the lift amount of the valve member at one seal member 133 is 0.5 / 100, and the lift amount of 1/100 for the two in total Secure.
- the lip seal type seal members (packing rings) were abutted against each other to seal them, but the lip seal type seal members Since the pressing force between the seal members (packing rings) due to internal pressure can not be expected so much when the pressure is very low, the packing position at the time of metal fitting connection is “about 0.7 to 1/100 of the diameter of the valve Design at the position where they push each other (in the case of a 150 to 400 mm bracket).
- each seal member 133 is in the state where the internal pressure by the abnormally high pressure fluid is applied.
- the actually effective clearance is 0.5 / 100 or more of the minimum inner diameter of the fluid passage 102 (that is, the area of the curtain where the fluid is actually discharged from the seal is the minimum area of the fluid passage 102). 2% or more).
- each seal member 133 means a position where the seal members are deformed relative to each other beyond the contact position where the seal members are not deformed.
- the fluid pressure abnormally rises, the deformation portion 140 extends in the axial direction, and the seal member 133 axially lifts, and the fluid is discharged from the seal portion by the seal member 133 to the outside of the fitting.
- the area of the leak path 138 discharged to the outside of the fitting can be made 1% or more of the minimum area of the flow passage 102 of the fitting.
- valve seat flow area (curtain area) is minimized in the flow area when the valve body is open of the JIS B 8210 lift type safety valve, and the lift of the safety valve is 1/40 or more. It meets the requirement that "the actual discharge area is 10% or more of the valve seat area".
- the requirement for each of the safety fitting with alarm valve function is 1/10 thereof (the total of 10 sets of this fitting is the same as the requirement of the above-mentioned JIS lift safety valve). Furthermore, JIS does not define the amount of water discharge for the safety valve.
- the normal pressure only shows elongation at a very slight elastic deformation, and hardly extends beyond the set high abnormal pressure. Then, until the set abnormal pressure is exceeded, the seal members hit each other to prevent the leakage of the pressure fluid.
- the set abnormal pressure is reached, plastic deformation of the deformed portion 140 starts to extend (the deformed portion 140 may not return once it has greatly expanded once).
- the seal member 133 is opened to form a leak path 138.
- a portion of the fluid jet port 116 formed by the notch hole 115 of the locking hook 113 is located in the area of the leak path 138.
- the high pressure fluid flowing out of the leakage passage 138 accelerates outward from the leakage passage 138 linearly through the fluid ejection outlet 116. It is often released. Therefore, the fluid that flows out linearly via the fluid ejection port 116 is ejected out of the metal fitting without being subjected to any excessive resistance during the ejection. Since the leaked fluid can be released so as to fly high or far, the fluid to be released makes the abnormal situation clearly manifest. Therefore, the ability to distinguish abnormal situations is enhanced, and it becomes easy for the observer, operator, etc. to grasp the abnormal situations.
- the fluid is also released from the fitting gap in the connecting portion other than the place where the locking hook portion 113 is provided.
- the side of the fitting projection 111 opens relatively large in the portion of the gap G2 where the steel balls 125 of the biasing mechanism 120 are disposed, and the leak path 138 is located in the opening region of the gap G2, Fluid can also be released to fly from this area (fluid jet).
- the steel ball 125 sinks to the state shown in FIG. 5 by the force of the high pressure fluid discharge flow when the fluid is jetted, the steel ball 125 does not significantly inhibit the high pressure fluid discharge, and a large fluid jet port Can be formed.
- the coupling portion 110 forms a fitting projection 111 and a fitting recess 112 at the front end of the coupling portion main body 105, and the inner surface of the coupling portion 110 is in contact with the outer surface of the coupling fitting main body 101. It is fitted. There is only a gap necessary for smooth operation between the inner surface of the coupling portion 110 and the outer surface of the fitting body 101. Therefore, a large amount of fluid is not discharged from between the inner surface of the coupling portion 110 and the outer surface of the fitting body 101.
- the portions with the steel balls 125 are combined to be approximately 24 directions. Eruptive flow occurs around the entire circumference. Therefore, regardless of the installation direction of the fitting, one of the leak jets can be observed, which makes it easy to recognize the abnormal situation. If there are three fluid jets 116 evenly divided in the circumferential direction, one will always be at an upper angle of 30 ° or more, which can sufficiently contribute to the emergence of an abnormal situation. More preferably, six or more places may be equally divided in the circumferential direction, and in this case, the angle is 60 ° or more.
- each fluid jet nozzle 116 is a jet nozzle from which the fluid radiates, it becomes easy to grasp the jetted fluid, it is easy to monitor an abnormal situation, and notify an abnormal situation.
- the monitoring and alarming functions can be made effective and remarkable.
- the jetted fluid emanating from the fluid jet 116 can be given a release ability that can be immediately noticed even from a distance, which is particularly suitable for use in a large scale system such as a large volume foam radiation system.
- the fluid ejection port 116 in the present embodiment utilizes the notch hole 115 formed to prevent stress concentration on the portion of the locking flange 113, the fluid ejection port 116 is separately provided as compared with the case.
- the configuration can be simplified.
- the fluid jet port 116 may be provided at another position corresponding to the leak path 138, but in this case, it is necessary to take into consideration a reduction in the metal fitting strength due to the drilling.
- the deformation portion 140 in the present embodiment hardly stretches beyond the set abnormal pressure, and normally the seal members 133 are butted against each other to prevent the fluid from flowing out. However, when the set pressure is exceeded, the deformation portion 140 preferentially extends until the leak path 138 is formed, and the deformation portion 140 extends until the leak path 138 is formed. After that, although it is not necessary to return or return, if it does not return, it becomes necessary to replace the main body of the joint or the joint itself.
- the frequency at which this abnormal situation actually occurs and operates is very rare, and since it is possible to prevent the destruction or damage of the coupled state and thus avoid serious situations such as accidents related to human life, it is possible It is unavoidable to replace or discard the coupling fitting 100 itself.
- the valve body 86 and the valve seat 84 of the safety valve 80 are not necessary to incorporate into the fitting as separate structures.
- a large coil spring is not necessary to incorporate a large coil spring into the fitting as a device for biasing the valve body 86.
- the safety valve is formed only by forming the deformed portion in a part of the connecting portion main body itself forming the connecting portion without basically changing the connecting portion and the sealing portion which are the components of the connecting fitting 100. It can be considered as a metal fitting provided with a function.
- cost reduction can be achieved with a configuration that can be relatively simplified without increasing the size of the fitting.
- the seal member of the valve body is normally pressed to seal the fluid at the normal time, and when the transfer fluid has an abnormally high pressure, a part of the coupling portion main body is axially not broken without breaking the coupling portion main body.
- the seal member which is the valve body (valve seat surface) pressed so far by extension, leaves the leak path away from the seal member or the seal portion, which is the other valve seat surface (valve body), It was configured to be made to function as a safety valve. Therefore, it is not necessary to intentionally incorporate a special and complicated valve body biasing device as a separate member into the fitting in order to release abnormal and excessive pressure fluid in the fluid passage.
- the member of the coupling portion main body which is one of the components of the coupling fitting, can be used as the valve body biasing device, and the configuration of the coupling fitting can be simplified.
- a metal fitting 100 according to another embodiment of the present invention will be described with reference to FIGS. 9 and 10.
- the basic form of this embodiment is the same as that of the metal fitting 100 of the embodiment described above, so the same elements as those of the embodiment described above are designated by the same reference numerals.
- the inner surface 151 of the fitting protrusion 111 of the coupling portion 110 in the coupling portion main body 105 is fitted to the outer peripheral surface of the seal ring portion 131 in the coupling metal fitting 100 of the coupling partner when coupled.
- the seal ring portion 131 or the like lifts due to an abnormal fluid pressure and an excessive pressure, the seal of the mating mating member and the inner surface 151 of the fitting projection 111 is lifted according to the distance separating the mating mating member. The clearance between the ring portion 131 and the outer peripheral surface was increased.
- the inner surface 151 of the fitting protrusion 111 is curved and inclined so as to be away from the outer peripheral surface of the seal ring portion 131 of the mating fitting 100 at the time of the protruding front end side of the fitting protrusion 111. It formed.
- the effect of increasing the gap according to the distance from the coupling partner can also be obtained by the bending and tilting. That is, the fluid discharge path 153 is formed by the gap formed between the inner surface 151 of the fitting protrusion 111 and the outer peripheral surface of the seal ring portion 131 in the mating fitting 100.
- the fluid discharge path 153 has a gap G3 formed between the seal ring portions 131 of the pair of metal fittings 100 when they are coupled to each other, the tip surface of the fitting protrusion 111 and the back wall surface of the fitting recess 112. It communicates with the gap G1 formed between them. Further, the fluid discharge path 153 also communicates with a gap G2 formed between the back surface of the fitting protrusion 111 and the back surface of the fitting recess 112.
- the fluid discharge path 153 also communicates with a gap formed between the side surfaces of the fitting protrusion 111 on which the locking collar 113 is provided and a fluid jet port 116.
- the fluid discharge path 153 also communicates with a leak path 138 formed when an abnormal and excessive pressure is generated in the transfer fluid. The abnormal and excessive pressure high pressure fluid is quickly discharged through the fluid discharge passage 153.
- each gap is formed by a rising wall perpendicular to the axis of the fitting, and since it is open to the outside, it not only communicates with the fluid discharge path 153 but also a fluid jet port opened in the direction perpendicular to the axis of the fitting. It will form 155. Therefore, the direction of the high pressure fluid jetted out from the fluid jet port 155 is perpendicular to the axis of the fitting, and becomes the circumferential direction of the fitting. The opening in the direction perpendicular to the axis of the fitting is the same for the fluid jet port 116 described above.
- the seal ring portions 131 of the pair of fittings 100 are lifted. As a result, a leak path 138 is formed between the seal ring portion 131. Then, as indicated by the arrows in FIG. 10, the high pressure fluid flows from the leak path 138 through the fluid discharge path 153 to the fluid jet port 116, the fluid jet port 155, etc., and is discharged to the outside of the metal fitting 100. Therefore, the high pressure fluid can be discharged quickly, and the joint failure of the metal fitting 100 can be avoided, and at the same time an abnormal situation can be realized by ejecting the high pressure fluid in the circumferential direction of the metal fitting.
- test target here is a specimen corresponding to the fitting (type: working pressure 1.3 MPa, nominal 300 mm) used for the large capacity foam water discharge system.
- the material and physical properties of this sample are as follows. First, the material is A5083FH defined in JIS H 4140-1988 “Aluminum and aluminum alloy forgings”. Although this is a material which is expensive and takes time and effort to process as compared with a cast product generally used, it is superior in that it is a tough (strong and hard to break) material.
- JIS standard values of tensile strength and elongation of the material of the specimen and actual measurement average values of the material actually used are as follows.
- the material generally used for the large-diameter fitting for a large-capacity foam water discharge system is a sand cast product of an aluminum alloy, and the elongation value (toughness) is largely different from that of the aluminum alloy forged product of the sample.
- Die casting products are also used in some companies, but they are basically cast and lack toughness.
- cast products generally have little elastic area, so they are likely to enter the plastic area immediately and cause permanent deformation, and since the elongation is small, there is no significant deformation of the metal fittings, but such properties as sudden breakage are noted. Have.
- the material generally used for this large-diameter fitting is AC7A specified in JIS H 5202-1999 "Aluminum alloy casting", and the standard values are as follows. Sand casting of material AC7A JIS standard value Tensile strength (N / mm 2 ) 140 or more Elongation (%) 6 or more Material casting of AC 7A JIS standard value Tensile strength (N / mm 2 ) 210 or more Elongation (%) 12 As described above, in order to confirm a state when an abnormal and excessive fluid pressure is actually generated in the metal fitting according to the present invention, it was examined to actually test.
- the swirl pump actually used in the large capacity foam water discharge system has a sufficient flow rate, the pressure can be increased only to a little over the working pressure.
- the actual water hammer phenomenon and the condition where the hoses expand in the radial direction and the length direction and accumulate energy are reproduced in the test room In order to do so, the testing method performed by storing energy with a huge pump that greatly exceeds the pump capacity of both, an accumulator, etc. is too dangerous. Therefore, it was abandoned to adopt such a pressure resistance test method.
- the axial load applied to the specimen when the pressure in the fitting is increased to an abnormal and excessive pressure can be obtained by the Pascal principle.
- the working pressure is 1.3MPa (1,300,000Pa)
- the nominal diameter of the connection fitting hose outer diameter (see Fig. 12) is 305mm (0.305m).
- the axial load is 94.9 kN, and the deformation of the test piece is extended by pulling at 3 to 4 times or more this load, and it is confirmed that the seal ring (seal member) lifts in the axial direction.
- the axial load (N) at this time can be obtained from the following equation.
- the shape of the sample 160 and the dimensions thereof are shown in FIGS. 11 to 15. 11 to 12 show a fitting body 101, FIG. 13 shows a pull rod 162, FIG. 14 shows a connecting portion body 105, and FIG. 15 shows a sealing member 133.
- the display method of these shapes and dimensions is based on the JIS drawing standard and the drawing method commonly used in Japan. Moreover, the unit of the displayed dimension is [mm].
- the specimen here corresponds to an element including the form shown in FIG. 4 and FIG. 5, and in particular, it is made possible to substitute for the test on a metal fitting in which the joint 110 is particularly deformed.
- the specimen corresponding to the connector main body 101 forms a sealing portion 131 around the supporting plate 161 having sufficient strength. Further, the support plate 161 is formed at its center with a mounting hole 163 into which a pull rod 162 shown in FIG. 13 is inserted and engaged.
- the pull rod 162 is inserted into the mounting hole 163 of the support plate 161, and while the support plate 161 is held by the pull rod 162, the respective pull rods 162 are held by the chuck of the tensile tester.
- a test was performed in which the test pieces were pulled in the axial direction apart from each other to apply a tensile load to the joint 110 of the test piece.
- the tester used at this time was a universal material tester RU500H-TK21 (500 kN) manufactured by Tokyo Hoki Co., Ltd., which is located at Tochigi Industrial Technology Center. Moreover, the load application speed in this test was 0.5 mm / min, the load range was 500 kN, and the displacement range was 100 mm.
- FIG. 16 is a graph showing test results of axial tensile load and axial displacement (displacement between chucks). Looking at the results of this tensile test, the slope of the graph up to a load of about 390 kN and the slope after that greatly change, and from here on up to a load of about 390 kN is elastic deformation, and the plastic deformation at higher loads Is considered to be happening. In addition, when the load is about 430 kN, a sawtooth waveform appears and it is considered that local failure has started. Therefore, it is thought that the range which can be used without destroying this connection metal fitting is to about 440 kN. This value corresponds to about 4.6 times the working pressure. The breaking pressure of the hose body is about 2.5 times less than the working pressure (3.0 MPa) as measured.
- the displacement shown in the graph of the tensile test results is the displacement between chucks of the tensile tester. Therefore, the sum of the displacements of the entire test piece is referred to, and the seal ring portion 131 (seal member 133) is lifted in the axial direction so that the support board (solid plate) 161 is deformed like a bowl. Although the amount of displacement due to deformation which does not lead to the effect is included, it is possible to grasp the characteristics of load: displacement of the entire specimen macroscopically.
- FIG. 17 is a graph showing data of tensile load and displacement between seal rings.
- FIGS. 18A to 18F The tensile load at this time and the state in which the coupling portion 110 at that time is deformed are shown in FIGS. 18A to 18F. That is, FIG. 18A shows that the tensile load W is 2 kN and the displacement between the seal rings is 0.0 mm, FIG. 18B shows that the tensile load W is 91 kN and the displacement between the seal rings is 0.4 mm, and FIG. Is 210 kN and the displacement between the seal rings is 1.5 mm, FIG. 18D is the displacement between the seal rings with the tensile load W of 300 kN, and FIG. 18E is the displacement between the seal rings with the tensile load W of 400 kN. Is 4.5 mm, FIG. 18F shows that the tensile load W is 440 kN and the displacement between the seal rings is 5.9 mm.
- the seal ring is about 5 when a load of 440 kN (about 4.6 times the working pressure) which is a usable range without breakage of the joint 100 is applied. It was confirmed to lift .9 mm.
- the lift amount corresponds to 2.15 / 100 of the inner diameter 275 mm of the fluid passage 102 of the metal fitting 100 substantially equal to the diameter of the valve seat.
- a locking flange 113 is provided on one side of the fitting protrusion 111 (coupling portion 110), and the engaging surface 113a of the locking protrusion 113 axially butts against and engages with the engaging surface of the mating fitting. There is.
- the angle (counter angle) ⁇ of this engagement surface is considered.
- the counter angle ⁇ of the specimen is set at 25 ° on the outer peripheral surface development view, but this angle changes as follows due to a strong load in the tensile test.
- the range that can be used without breaking this metal fitting is up to about 440 kN (about 4.6 times the working pressure), and at this time, the remaining counter angle ⁇ is approximately 0 ° Therefore, the counter angle with the basic design of about 25 ° was the minimum and optimum value. If the counter angle ⁇ is smaller than that, the direction of the counter angle ⁇ is reversed when an abnormal pressure is received, and a rotational force in the bracket detachment direction is generated by the received axial load. .
- the range of at least 20 ° to 30 ° which is also consistent with the above-mentioned reason, is appropriate, and particularly 25 ° is preferable.
- the fluid pressure in the test body and the state of the jet were confirmed in this test. That is, when the sample is sealed and its internal pressure is increased, the fluid starts to be jetted at 0.4 MPa and the pressure decreases, and then, when the valve of the outdoor fire hydrant is maximally opened, the fluid is 2-3 m circumferentially Spouted. At this time, since the flow rate to be ejected is large, the pressure can be increased only to 0.3 MPa. As a result of the pressure-passing test, it was confirmed that it is possible to warn an operator or the like of the occurrence of an abnormal situation by the fluid ejected from the leak path.
- the seal member is extended by an axial tensile force applied to the coupling body when the pressure of the fluid in the fitting body is abnormally increased, and the angle of the locking surface inclined in an overhang shape is extended in the axial direction.
- the locking ridge having the locking surface is deformed until the leaked channel which discharges the fluid away from the mating seal member and is in the range of an angle at which the angle is not negative. Keep the parts locked to each other, but the angle of the locking surface is equivalent to the pressure at which tubes such as hoses connected to the connector body break in the direction to pull the connector body away from each other. The objective can be achieved even when the axial load is within the range of angles that do not become negative when applied to the fitting body.
- the locking surface has a locking surface when the angle of the locking surface increases to three times the estimated use pressure with the locking flange locked and the axial load is applied in a direction to separate the fitting body from each other.
- the object can also be achieved if the locking ridge is deformed and the angle is not in the negative range.
- the angle of the locking surface has the locking surface even when the fluid is raised to the test pressure of the connector with the locking flange locked and an axial load is applied in a direction to separate the connector main bodies from each other.
- the object can also be achieved if the locking ridge is deformed and the angle is not in the negative range.
- twin-star metal fittings are used that use a pair of identical structural coupling parts without male and female, but the coupling metal fittings of the present invention do not depend on the coupling parts or the bracket type.
- the present invention is also applicable to the multi-lag of the company, and the Struts-type fitting (DIN 14300 A-Druckkplung) of the Yone company.
- the axial end portion has a mounting portion for attaching the tubes or other devices, and a fluid passage is formed in the inside
- a connecting part having a fitting body and an attaching part for attaching to the fitting body at one end side in the axial direction, and a connecting part at the other end side in the axial direction being connectable with a connecting fitting to be coupled
- a seal member provided on the other axial end portion of the fitting body for closing the gap between the coupling fitting and the seal member in the fitting, wherein the coupling portion is coupled
- the coupling portion is coupled
- the locking surface is extended by an axial tensile
- a fitting for joining tubes or tubes to another device comprising: a fitting body having an attachment portion for attaching the tubes at one end in an axial direction, and having a fluid passage formed therein; A coupling portion main body having an attaching portion for attaching to the coupling fitting main body at one end side portion in the axial direction, and a coupling portion main body having a coupling portion connectable with a coupling fitting of a coupling partner at the other end side portion in the axial direction A seal member provided at the other axial end of the fitting body for closing a gap between the coupling fitting and the seal member in the fitting;
- the connecting portion has a locking flange that locks with the locking flange of the mating partner, and the locking surface of the locking flange is inclined in an overhanging manner with respect to the circumferential direction, and is over The angle of the hanging inclined surface is such that an axial load equivalent to the pressure at which the pipe breaks is applied to the fitting main body in the direction in which the fitting main body is pulled away from each other in the state where the
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Abstract
Description
請求項2の発明は、管類相互または管類と他の機器とを結合する結合金具において、軸方向の一端側部分に前記管類または他の機器を取り付けるための装着部を有し、内部に流体通路を形成した結合金具本体と、軸方向の一端側部分に前記結合金具本体に取り付けるための取付け部を有し、軸方向の他端側部分には結合相手の結合金具と連結可能な結合部、結合部には結合相手の係止鉤部と係止する係止鉤部、軸方向に衝合して隙間を閉塞可能なシール面とを有した結合部本体と、前記結合部本体に形成され、結合金具本体内の流体の圧力が異常上昇したときに結合部本体に加わる軸方向の異常な引っ張り力により、軸方向に伸ばされることで前記シール面が結合相手のシール面から離反して外へ流体を放出するリーク路を形成する変形部とを備え、前記結合部の結合相手の係止鉤部と係止する係止鉤部の係止面は周方向に対してオーバーハング状に傾斜しており、前記係止面の角度は、流体の圧力が異常上昇して前記変形部が伸ばされて、シール面が離反して外へ流体を放出するリーク路を形成するまで、前記角度がマイナスにならない角度の範囲にとどまり前記係止鉤部が互いに係止した状態を維持する結合金具である。
請求項3の発明は、前記角度は、流体の圧力が金具使用圧力の3倍まで異常上昇したときの軸方向の荷重が作用して前記結合部が変形した場合でも、前記角度がマイナスにならない角度の範囲にある請求項1または請求項2の結合金具である。
請求項4の発明は、流体の圧力が結合金具の試験圧力に上昇したときの軸方向の荷重が作用して前記結合部が変形した場合でも、前記角度がマイナスにならない角度の範囲にある請求項1、請求項2または請求項3の結合金具である。
請求項5の発明は、前記の結合金具、結合部本体及び結合部の少なくともいずれかの素材を引張強さ250N/mm2以上、伸び15%以上のアルミニウム合金鍛造品とし、前記角度が20°~30°の範囲内である請求項1乃至請求項4のいずれかの結合金具である。
このときのシール部材133の後退量Rは変形部140の軸方向への伸び量に対応する(図5参照)。そして、一対の結合金具本体101の各シール部材133が互いに離反してその間に生じる間隙によってリーク路138を形成する。一対の結合金具100はいずれも同じ構造であるのでそれぞれの後退量Rは一致し、一対の結合金具100におけるシール部材133が相対的に離間した距離Lはそれぞれの後退量Rの和となる(図5参照)。そして、異常で過大な流体圧力が発生したときにシール部材133の間には2Rの幅(L)のリーク路138が出現し、このリーク路138は結合金具本体101の流体通路102に連通するため、流体通路102内の異常で過大な高圧流体はそのリーク路138を通じて結合金具100の外へ放出される。
次に、本発明に係る結合金具を試験する実施例について説明する。ここでの試験対象は大容量泡放水システムに用いられる結合金具(型式:使用圧1.3MPa、呼称300mm)に対応した供試体とする。
引張強さ(N/mm2)275以上 296(測定値296,296,296)
伸び(%) 16以上 28.7(測定値31,29,26)
ところで、大容量泡放水システム用の大口径結合金具で一般的に使用される材質はアルミニウム合金の砂型鋳造品であり、供試体のアルミニウム合金鍛造品とは伸びの値(靱性)が大きく異なる。金型鋳造品等も一部の会社で使用されているが、基本的に鋳物であるので強靭さに欠ける。なお、鋳造品は一般的に弾性域が余りないので直ぐに塑性域に入って永久変形を起こしやすく、また、伸びが小さいので金具が大きく変形することもないが、突如破壊すると云う様な特性を持つ。
材質AC7Aの砂型鋳物 JIS規格値
引張強さ(N/mm2) 140以上
伸び(%) 6以上
材質AC7Aの金型鋳物 JIS規格値
引張強さ(N/mm2) 210以上
伸び(%) 12以上
そして、本発明に係る結合金具に異常で過大な流体圧力が実際に発生した時の状態を確認するため、実際に試験することを検討した。
軸荷重(N)=Pπr2
=1,300,000×3.14×(0.305/2)2=94,932
ここでの供試体160の形状及びその寸法は図11乃至図15に示した。図11乃至図12は結合金具本体101、図13は引張り棒162、図14は結合部本体105、図15はシール部材133に対応する供試体を示す。これらの形状及び寸法の表示方法は、JIS製図規格及び日本で慣用された製図法による。また、表示した寸法の単位は[mm]である。
この引張り試験結果を見ると、荷重390kN位までのグラフの傾きと、それを超えた後の傾きが大きく変化しており、これから荷重390kN位までが弾性変形であり、それ以上の荷重では塑性変形が起っていると考えられる。また、荷重が430kN位になると、ノコギリ状の波形が現れ、局部的な破壊が始まっていると考えられる。したがって、本結合金具を破壊せずに使用できる範囲は440kN程度まであると考えられる。この値は使用圧の約4.6倍の圧力に相当する。なお、ホース体の破断圧力は実測値で使用圧の2.5倍弱(3.0MPa)程度である。
2 0.0 25
91 1.2 24
210 2.7 22
300 3.9 16
400 5.2 4
440 5.7 0
従来の結合金具の場合、出荷検査等で一時的に試験圧力(使用圧の1.5~2.0倍)を受けた後、使用圧(常用最高使用圧力)以内で使用されていたので嵌合突部111の曲りは極わずかな弾性変形による曲りに留まると考えていた。よって、結合金具の材質やサイズ・詳細形状等によって前後するが、15°程度のカウンターアングルを設けていれば済むことであった。
1.管類相互または管類と他の機器とを結合する結合金具において、軸方向の一端側部分に前記管類または他の機器を取り付けるための装着部を有し、内部に流体通路を形成した結合金具本体と、軸方向の一端側部分に前記結合金具本体に取り付けるための取付け部を有し、軸方向の他端側部分には結合相手の結合金具と連結可能な結合部を有した結合部本体と、前記結合金具本体の軸方向の他端側部分に設けられ、結合相手の結合金具におけるシール部材との間の隙間を閉塞するためのシール部材と、を備え、前記結合部は、結合相手の係止鉤部と係止する係止鉤部を有し、該係止鉤部の係止面は、周方向に対してオーバーハング状に傾斜しており、オーバーハング状に傾斜した係止面の角度は、前記結合金具本体内の流体の圧力が異常に上昇したときに前記結合部本体に加わる軸方向の引っ張り力により軸方向に伸ばされることで前記シール部材が結合相手のシール部材から離反して外へ流体を放出するリーク路を形成するまで係止面を有する係止鉤部が変形して該角度がマイナスにならない角度の範囲にあり、かつ係止鉤部が互いに係止した状態を維持する結合金具。
前記結合部は、結合相手の係止鉤部と係止する係止鉤部を有し、該係止鉤部の係止面は、周方向に対してオーバーハング状に傾斜しており、オーバーハング状に傾斜した係止面の角度は、係止鉤部が互いに係止した状態で結合金具本体を互いに引き離す方向へ前記管類が破断する圧力に相当する軸荷重が結合金具本体に加わったときにマイナスにならない角度の範囲にある結合金具。
3.前記変形部は、前記シール部材が相手側のシール部材から離反する全リフト量が該結合金具の流路部最少内径の1/100である第1項または第2項に記載の結合金具。
2.前記変形部が伸びて前記シール部材が軸方向にリフトしてシール部を開放したときに流体を放出するシール部の開放隙間の面積を、前記結合金具本体の流路部最少面積の1%以上とした第1項または第2項に記載の結合金具。
101 …結合金具本体
102 …流体通路
103 …装着部
105 …結合部本体
110 …結合部
113 …係止鉤部
113a…係止面
116 …流体噴出口
138 …リーク路
θ …カウンターアングル(係止面の角度)
Claims (5)
- 管類相互または管類と他の機器とを結合する結合金具であって、
軸方向の一端側部分に前記管類を取り付けるための装着部を有し、
軸方向の他端側部分には結合相手の結合金具と連結可能な結合部、結合部には結合相手の係止鉤部と係止する係止鉤部、軸方向に衝合して隙間を閉塞可能なシール面とを有し、内部に形成した流体通路を備え、
前記係止鉤部の係止面は、周方向に対してオーバーハング状に傾斜しており、係止鉤部が係合した状態において前記結合金具を互いに引き離す軸方向の荷重が作用した場合に、荷重の一部がオーバーハング状に傾斜した所定の角度に応じた周方向における分力となって係合状態の係止鉤部を周方向に相互にさらに接近させようとして、係止鉤部がより強く係合する結合金具において、
前記係止面の角度は、流体の圧力が前記管類の破断圧力まで異常上昇したときの軸方向の異常荷重が作用して前記結合部または結合金具が変形した場合でも、前記角度がマイナスにならない角度の範囲にとどまり前記係止鉤部が互いに係止した状態を維持する結合金具。 - 管類相互または管類と他の機器とを結合する結合金具において、
軸方向の一端側部分に前記管類または他の機器を取り付けるための装着部を有し、内部に流体通路を形成した結合金具本体と、
軸方向の一端側部分に前記結合金具本体に取り付けるための取付け部を有し、軸方向の他端側部分には結合相手の結合金具と連結可能な結合部、結合部には結合相手の係止鉤部と係止する係止鉤部、軸方向に衝合して隙間を閉塞可能なシール面とを有した結合部本体と、
前記結合部本体に形成され、結合金具本体内の流体の圧力が異常上昇したときに結合部本体に加わる軸方向の異常な引っ張り力により、軸方向に伸ばされることで前記シール面が結合相手のシール面から離反して外へ流体を放出するリーク路を形成する変形部と、を備え、
前記結合部の結合相手の係止鉤部と係止する係止鉤部の係止面は、周方向に対してオーバーハング状に傾斜しており、
前記係止面の角度は、流体の圧力が異常上昇して前記変形部が伸ばされて、シール面が離反して外へ流体を放出するリーク路を形成するまで、前記角度がマイナスにならない角度の範囲にとどまり前記係止鉤部が互いに係止した状態を維持する結合金具。 - 前記角度は、流体の圧力が金具使用圧力の3倍まで異常上昇したときの軸方向の荷重が作用して前記結合部が変形した場合でも、前記角度がマイナスにならない角度の範囲にある請求項1または請求項2の結合金具。
- 前記角度は、流体の圧力が結合金具の試験圧力に上昇したときの軸方向の荷重が作用して前記結合部が変形した場合でも、前記角度がマイナスにならない角度の範囲にある請求項1、請求項2または請求項3の結合金具。
- 前記の結合金具、結合部本体及び結合部の少なくともいずれかの素材を引張強さ250N/mm2以上、伸び15%以上のアルミニウム合金鍛造品とし、前記角度が20°~30°の範囲内である請求項1乃至請求項4のいずれかの結合金具。
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EP15827049.6A EP3176486B1 (en) | 2014-07-29 | 2015-07-28 | Coupling fitting |
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JP5801979B1 (ja) | 2015-10-28 |
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US9879809B2 (en) | 2018-01-30 |
US10107435B2 (en) | 2018-10-23 |
DK3176486T3 (da) | 2020-02-24 |
JP5982599B2 (ja) | 2016-08-31 |
CA2956774C (en) | 2018-01-02 |
US20170138521A1 (en) | 2017-05-18 |
PL3176486T3 (pl) | 2020-06-01 |
EP3176485A4 (en) | 2018-01-10 |
JPWO2016017652A1 (ja) | 2017-04-27 |
EP3176485A1 (en) | 2017-06-07 |
US20170138520A1 (en) | 2017-05-18 |
EP3176486B1 (en) | 2019-12-04 |
CN107076343B (zh) | 2018-11-30 |
EP3176486A1 (en) | 2017-06-07 |
EP3176486A4 (en) | 2018-04-25 |
CN107002930B (zh) | 2019-06-11 |
ES2769199T3 (es) | 2020-06-25 |
PL3176485T3 (pl) | 2019-06-28 |
CA2956665C (en) | 2018-01-02 |
JPWO2016016951A1 (ja) | 2017-04-27 |
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CA2956774A1 (en) | 2016-02-04 |
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