WO2023032359A1 - Pressure reducing valve and manufacturing method therefor - Google Patents

Pressure reducing valve and manufacturing method therefor Download PDF

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Publication number
WO2023032359A1
WO2023032359A1 PCT/JP2022/021100 JP2022021100W WO2023032359A1 WO 2023032359 A1 WO2023032359 A1 WO 2023032359A1 JP 2022021100 W JP2022021100 W JP 2022021100W WO 2023032359 A1 WO2023032359 A1 WO 2023032359A1
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WO
WIPO (PCT)
Prior art keywords
pressure reducing
cap
valve
reducing valve
housing
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PCT/JP2022/021100
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French (fr)
Japanese (ja)
Inventor
功 根岸
勝之 菱沼
郁裕 伊藤
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日本サーモスタット株式会社
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Application filed by 日本サーモスタット株式会社 filed Critical 日本サーモスタット株式会社
Publication of WO2023032359A1 publication Critical patent/WO2023032359A1/en

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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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded

Definitions

  • the present invention relates to a pressure reducing valve and its manufacturing method.
  • Patent Document 1 there is a pressure reducing valve that is installed in a flow path that leads to a water discharge device such as a shower. known (see, for example, Patent Document 1).
  • a pressure reducing valve has a housing, and the housing has a cylindrical housing body and a cap that prevents parts inside the housing body from coming off.
  • the dimensions of the individual pressure reducing valves vary due to variations in the dimensions of the parts fixed between the housing body and the cap, resulting in differences in the dimensions of the individual pressure reducing valves.
  • the size of the pressure reducing valve is adjusted by crushing a portion of a metal valve seat frame that constitutes a portion of the valve seat.
  • the pressure reducing valve is made of synthetic resin, part of the valve seat frame cannot be crushed, making it difficult to control the dimensions of the pressure reducing valve.
  • the pressure reducing valve of the present invention (for example, the pressure reducing valve 1 of the embodiment; the same shall apply hereinafter) a synthetic resin housing (for example, the housing 2 of the embodiment; the same shall apply hereinafter) having an inflow port and an outflow port, and through which the fluid flowing in from the inflow port can flow out from the outflow port; a valve body (for example, the valve body 3 of the embodiment; hereinafter the same) movably accommodated in the housing; a valve seat provided in the housing (for example, the valve seat 4 of the embodiment; the same shall apply hereinafter); a biasing member (for example, the biasing member 5 of the embodiment; the same shall apply hereinafter) that biases the valve body in a direction away from the valve seat; with A pressure reducing valve capable of shutting off the flow of fluid in the housing by causing the valve body to come into contact with the valve seat against the biasing force of the biasing member when the pressure of the fluid in the outflow port increases,
  • the manufacturing method of the pressure reducing valve of the present invention comprises: a housing having an inflow port and an outflow port, through which the fluid flowing in from the inflow port can flow out from the outflow port; a valve body movably accommodated in the housing; a valve seat provided within the housing; a biasing member that biases the valve body in a direction away from the valve seat; with A method for manufacturing a pressure reducing valve, wherein when the pressure of the fluid in the outflow port increases, the valve body contacts the valve seat against the biasing force of the biasing member to block the flow of the fluid in the housing.
  • the housing comprises a housing body and a cap, A synthetic resin member is arranged so as to be sandwiched between the housing body and the cap, It is characterized in that the abutting portion between the cap and the synthetic resin member is melted by vibrating with ultrasonic waves.
  • the size of the pressure reducing valve can be adjusted by adjusting the amount of welding between the cap and the synthetic resin member or the amount of melting of the contact portion between the cap and the synthetic resin member. Therefore, even if the pressure reducing valve is made of synthetic resin, it is possible to adjust the size without crushing a part of the valve seat unlike the pressure reducing valve made of metal, and the size of the pressure reducing valve can be easily controlled.
  • the valve seat includes a seat member (for example, the O-ring 42 of the embodiment; hereinafter the same) that can come into contact with the valve body, and a valve seat frame that holds the seat member (for example, the valve seat frame of the embodiment). 41. Same below.) and
  • the valve seat frame may be the synthetic resin member.
  • valve seat frame that constitutes the valve seat can be used as a synthetic resin member for size adjustment, so an increase in the number of parts of the pressure reducing valve can be suppressed.
  • the cap or the synthetic resin member has a projection for size adjustment
  • the cap and the synthetic resin member may be welded together by melting the dimension adjusting projection.
  • the cap or the synthetic resin member has a dimension adjusting projection on the contact portion,
  • the dimension adjusting projection may be melted by vibrating the cap with ultrasonic waves.
  • the dimensions of the pressure reducing valve can be adjusted by melting the dimension adjusting projections.
  • the size adjusting protrusion has a convex shape, and according to such a shape, the size adjusting protrusion can be melted more actively than the mating contact portion, and the size adjustment of the pressure reducing valve can be easily performed. can be done.
  • either the cap having the dimension adjusting projection or the synthetic resin is made of a material that melts more easily than the other. may have been
  • the size adjustment projection can be melted more positively, so the size adjustment of the pressure reducing valve can be made easier.
  • FIG. 4 is an explanatory diagram showing an open state of the pressure reducing valve according to the first embodiment of the present invention
  • FIG. 4 is an explanatory diagram showing a closed state of the pressure reducing valve according to the first embodiment of the present invention
  • 1 is a perspective view showing a cap of a pressure reducing valve according to a first embodiment of the invention
  • FIG. 1 is a perspective view showing a housing body of a pressure reducing valve according to a first embodiment of the present invention
  • FIG. FIG. 4 is an explanatory view showing a state before starting welding between the cap and the housing body of the pressure reducing valve according to the first embodiment of the present invention
  • FIG. 4 is an explanatory diagram showing a state at the start of welding between the cap and the housing body of the pressure reducing valve according to the first embodiment of the present invention
  • FIG. 5 is an explanatory view showing a state at the start of welding between the cap and the valve seat frame of the pressure reducing valve according to the first embodiment of the present invention
  • FIG. 5 is an explanatory diagram showing a state in which the amount of melted dimension adjusting projection of the pressure reducing valve according to the first embodiment of the present invention is small
  • FIG. 5 is an explanatory diagram showing a state in which a large amount of melt is present in the dimension adjusting projection of the pressure reducing valve according to the first embodiment of the present invention
  • FIG. 5 is an explanatory diagram showing a modification of the pressure reducing valve according to the first embodiment of the present invention
  • a pressure reducing valve 1 of the first embodiment comprises a synthetic resin cylindrical housing 2 having an inlet 2a and an outlet 2b, and a housing 2 which slides in the housing 2 in the central axis direction.
  • a cylindrical valve body 3 made of synthetic resin that is movably arranged, a valve seat 4 with which the valve body 3 contacts and separates, and a biasing member that urges the valve body 3 in a direction away from the valve seat 4.
  • a biasing member 5 for example, a coil spring
  • a spring seat 6 supporting one end of the biasing member 5 and a holder 7 stacked on the spring seat 6 are provided.
  • the housing 2 includes a bottomed cylindrical housing body 21 having an open top and a through hole 21a serving as an inlet 2b at a bottom 21e. and a cap 22 for fixing the valve seat 4, the spring seat 6, and the holder 7.
  • the cap 22 is formed with an opening that serves as an inflow port 2a, and fluid can flow into the housing 2 through this inflow port 2a.
  • a female screw is provided on the inner peripheral surface of the inlet 2a where the opening of the cap 22 is provided.
  • a small-diameter portion 21b and a large-diameter portion 21c having a larger diameter than the small-diameter portion 21b are formed on the inner peripheral surface of the housing body 21 from the side of the bottom portion 21e.
  • An annular stepped portion 21d is formed at the boundary between the small diameter portion 21b and the large diameter portion 21c.
  • a male screw is formed on the outer peripheral surface of the housing main body 21 on the side of the bottom portion 21e.
  • the outer diameter of the male threaded portion 21g formed with this male thread is smaller than the outer diameter of the other portion of the housing body 21, and an annular gap is formed between the male threaded portion 21b and the other portion of the outer peripheral surface of the housing body 21.
  • the cap 22 is ultrasonically welded to the housing body 21 . Further, referring to FIG. 3, on the outer peripheral surface of cap 22, ribs 22a protruding radially outward are arranged at intervals in the circumferential direction. Each rib 22 a extends in the insertion direction of the cap 22 into the housing body 21 . Further, referring to FIG. 4, the large-diameter portion 21c of the housing body 21 is provided with a plurality of groove portions 21f that allow passage of the ribs 22a.
  • the stepped portion 21d includes an annular spring seat 6 against which the upper end (one end) of the biasing member 5 abuts, an annular holder 7, and a valve seat 4 from the stepped portion 21d side. They are stacked in order.
  • the spring seat 6, the holder 7 and the valve seat 4 are sandwiched between the stepped portion 21d and the cap 22 and fixed.
  • a tubular portion 31 of the valve body 3, which will be described later, is inserted into the central portion of the spring seat 6 and the holder 7 so as to be axially movable.
  • Elastic ring-shaped sealing members 6 a and 6 b are provided on the inner and outer circumferences of the spring seat 6 .
  • the sealing member 6 a on the inner peripheral side liquid-tightly closes the space between the spring seat 6 and the tubular portion 31 of the valve body 3 .
  • the sealing member 6b on the outer peripheral side seals the gap between the spring seat 6 and the housing 2 in a liquid-tight manner.
  • the holder 7 presses the sealing members 6a and 6b from above.
  • the valve body 3 includes a cylindrical portion 31 having a circular cross-section, a protruding portion 32 projecting radially outward from the central portion of the cylindrical portion 31 , and a fitting provided on the outer peripheral edge of the protruding portion 32 .
  • An elastic ring-shaped sealing member 32 a is fitted in the groove and liquid-tightly closes the gap between the small diameter portion 21 b of the housing 2 and the projecting portion 32 .
  • the tubular portion 31 of the valve body 3 is inserted through the spring seat 6 and the central portion of the holder 7 , and the upper end (tip) of the tubular portion 31 faces the O-ring 42 of the valve seat 4 , which will be described later.
  • the valve seat 4 includes a valve seat frame 41 made of synthetic resin, an O-ring 42 as a seat member, and a cover member 43 made of synthetic resin.
  • the valve seat frame 41 includes an annular outer ring portion 41a, an inner ring portion 41b arranged inside the outer ring portion 41a with a gap therebetween, and a gap between the outer ring portion 41a and the inner ring portion 41b. and a bridge portion 41c that is connected by The outer peripheral portion of the outer ring portion 41a is pressed by a cap 22 from above.
  • the cover member 43 includes a closing plate portion 43a that closes the upper edge of the inner annular portion 41b, an inner peripheral portion 43b that hangs down from the center of the closing plate portion 43a and extends through the central hole of the O-ring 42, and an inner A first drop-off preventing portion 43c is provided at the lower end of the peripheral portion 43b and has a larger diameter than the inner peripheral portion 43b so as to prevent the O-ring 42 from dropping off from the inner annular portion 41b.
  • the closing plate portion 43a is ultrasonically welded to the upper edge of the inner annular portion 41b.
  • the lower end of the inner ring portion 41b is provided with a second drop-off prevention portion (not shown) that protrudes toward the inner peripheral side. 3 is held by the valve seat frame 41 with its contact portion exposed.
  • fluid for example, water, hot water, etc.
  • a force is applied to the valve body 3 to push it upward by the pressure on the side of the outflow port 2b.
  • the valve body 3 moves upward against the biasing force of the biasing member 5, and the gap between the valve body 3 and the valve seat 4 becomes narrower.
  • pressure loss increases when the fluid passes through As a result, the pressure on the outflow port 2b side decreases, and the flow rate of the fluid passing through the pressure reducing valve 1 decreases.
  • the valve body 3 stops at a position where the force pushed up by the pressure on the outflow port 2b side and the force pushed down by the biasing member 5 are balanced.
  • the pressure on the outflow port 2b side exceeds a predetermined value, the upper edge of the valve body 3 comes into contact with the O-ring 42 to block the flow of fluid in the pressure reducing valve 1, as shown in FIG.
  • the pressure reducing valve 1 has a first welded portion 10 that is a welded portion between the cap 22 and the housing body 21 and a second welded portion 11 that is a welded portion between the cap 22 and the valve seat frame 41 .
  • the first welded part 10 and the second welded part 11 are joined by ultrasonic welding.
  • the material of the cap 22 and housing body 21 is POM (polyacetal) resin.
  • the material of the valve seat frame 41 is PPS (polyphenylene sulfide) resin, and the cap 22 is made of a material that melts more easily than the valve seat frame 41 .
  • the first welded portion 10 is located on the inner periphery of the upper end portion of the housing body 21 .
  • a tapered surface 9 whose diameter gradually increases upward is formed on the inner periphery of the upper end portion of the housing body 21 which becomes the first welded portion 10 before welding.
  • an annular corner portion 22b is formed on the outer periphery of the cap 22 which becomes the first weld portion 10 before welding. This corner portion 22b contacts the tapered surface 9 from above.
  • the second welded portion 11 is located at the upper end of the outer peripheral portion of the outer ring portion 41 a of the valve seat frame 41 .
  • an annular flat surface 41g facing upward is formed on the outer peripheral portion of the outer annular portion 41a.
  • the cap 22 that forms the second welded portion 11 before welding is provided with an annular dimension adjusting projection 8 that protrudes downward.
  • the tip of the dimension adjusting projection 8 abuts on the flat surface 41g from above.
  • This dimension adjusting protrusion 8 is a portion that is melted to adjust the dimension x of the pressure reducing valve 1 to a predetermined dimension, and in some cases, it may be entirely melted and disappear.
  • corner 22b of the cap 22 and the dimension adjusting projection 8 abut against the tapered surface 9 and the flat surface 41g from above. These abutments can be pressurized at the same time when a downward force is applied to the cap 22 .
  • the cap 22 is ultrasonically vibrated while applying downward force to the cap 22 .
  • the contact portion between the corner portion 22b of the cap 22 and the tapered surface 9 of the housing body 21 is pressurized and melted by frictional heat.
  • the cap 22 is ultrasonically welded to the housing body 21 to form the first welded portion 10 .
  • the spring seat 6 is separated from the stepped portion 21d. Therefore, the dimension adjusting projection 8 of the cap 22 and the flat surface 41g of the valve seat frame 41 are in contact with each other. Not high enough to start. Therefore, in the first welding step, the cap 22 is not welded to the valve seat frame 41 but is welded only to the housing body 21 . As the welding first step proceeds, as shown in FIG. 7, the spring seat 6 abuts against the stepped portion 21d, and the process shifts to the welding second step.
  • the cap 22 is ultrasonically vibrated while applying downward force to the cap 22 continuously from the first welding process.
  • the welding of the first welding portion 10 progresses, and the contact portion between the dimension adjusting projection 8 of the cap 22 and the flat surface 41g of the valve seat frame 41 is pressurized and melted by frictional heat.
  • the cap 22 is ultrasonically welded to the valve seat frame 41 to form the second welded portion 11 .
  • this second welding step the welding of the cap 22 and the housing body 21 at the first welding portion 10 and the welding of the cap 22 and the valve seat frame 41 at the second welding portion 11 proceed simultaneously.
  • the second welding step proceeds and the dimension x of the pressure reducing valve 1 reaches a predetermined dimension, the vibration of the cap 22 is stopped. As a result, the welding process is completed, and the pressure reducing valve 1 is completed.
  • the pressure reducing valve 1 of the first embodiment has the inflow port 2a and the outflow port 2b.
  • a housing 2 made of resin, a valve body 3 movably accommodated in the housing 2, a valve seat 4 provided in the housing 2, and a biasing force that biases the valve body 3 away from the valve seat 4.
  • the valve body 3 can be brought into contact with the valve seat 4 against the biasing force of the biasing member 5 to block the flow of the fluid in the housing 2. .
  • the housing 2 includes a housing body 21 and a cap 22.
  • a valve seat frame 41 (synthetic resin member) is arranged so as to be sandwiched between the housing body 21 and the cap.
  • the cap 22 is welded to the valve seat frame 41 .
  • the abutting portion between the cap 22 and the valve seat frame 41 is fused by ultrasonic vibration.
  • the dimension x from the outer peripheral stepped portion 21h of the pressure reducing valve 1 to the upper end of the cap 22 is adjusted to a predetermined dimension, but the dimension adjustment of the pressure reducing valve of the present invention is limited to this. do not have.
  • the dimension of the pressure reducing valve to be adjusted according to the present invention may be the entire length of the pressure reducing valve, and any vertical (axial) dimension of the pressure reducing valve can be adjusted.
  • at least one of the cap 22 and the valve seat frame 41 may be melted, and the cap 22 and the valve seat frame 41 do not necessarily have to be joined.
  • the valve seat 4 includes an O-ring 42 (seat member) capable of coming into contact with the valve body 3 and a valve seat frame 41 holding the O-ring 42. and
  • This valve seat frame 41 is a synthetic resin member.
  • the valve seat frame 41 forming the valve seat 4 can be used as a synthetic resin member for size adjustment, so that the increase in the number of parts of the pressure reducing valve 1 can be suppressed.
  • valve seat frame 41 is used as the synthetic resin member in the first embodiment, the synthetic resin member of the present invention is not limited to the valve seat frame 41 .
  • the spring seat 6 and holder 7 may be the synthetic resin members of the present invention, or washers, spacers, and the like may be layered on the valve seat frame 41 to form the synthetic resin members of the present invention.
  • the cap 22 has a dimension adjusting projection 8.
  • the cap 22 is welded to the valve seat frame 41 by melting the dimension adjusting projection 8 .
  • the dimension adjusting projection 8 is melted by vibrating the cap 22 with ultrasonic waves. According to this configuration, the size of the pressure reducing valve 1 can be adjusted by melting the size adjusting projection 8 .
  • the dimension adjusting protrusion 8 has a convex shape. With such a shape, the size adjustment projection 8 can be actively melted, so the size adjustment of the pressure reducing valve 1 can be facilitated.
  • the dimension adjusting projection 8 is provided on the cap 22, but the dimension adjusting projection of the present invention may be provided on a synthetic resin member.
  • the dimension adjusting projection 8 is annular, but the dimension adjusting projection of the present invention is not limited to this. may be a protrusion of Furthermore, since it is sufficient that the size can be adjusted by melting the cap or the synthetic resin member, the size adjustment projection may be omitted.
  • the cap 22 on which the dimension adjusting projection 8 is formed is made of a material that melts more easily than the valve seat frame 41 (synthetic resin member of the valve seat 4).
  • the cap 22 and the housing body 21 are made of POM (polyacetal) resin
  • the valve seat frame 41 (synthetic resin member of the valve seat 4) is made of PPS (polyphenylene sulfide) resin.
  • the size adjusting projection when the size adjusting projection is provided on the synthetic resin member, the same effect can be obtained by forming the synthetic resin member from a material that melts more easily than the cap.
  • the materials of the members to be welded are made the same in order to ensure the bonding strength of the welded part.
  • the dimension adjusting projection 8 is intended to be melted for dimension adjustment and does not require bonding strength. Therefore, in the first embodiment, the cap 22 and the valve seat frame 41 are made of different materials. In order to secure the joint strength between the cap 22 and the housing body 21, they are preferably made of the same material, but the material can be changed as appropriate. Also, the material of the synthetic resin member of the present invention can be changed as appropriate, and may be the same material as the housing 2 .
  • the manufacturing method of the pressure reducing valve of the first embodiment when the corner portion 22b and the tapered surface 9 are in contact with each other, the spring seat 6 is separated from the stepped portion 21d. After the ultrasonic welding with the cap 22 is started, the contact portion between the cap 22 and the valve seat frame 41 (synthetic resin member) starts to melt. As a result, the size of the pressure reducing valve 1 can be adjusted by increasing or decreasing the amount of melt in the contact portion between the cap 22 and the valve seat frame 41 while securing the welding margin between the housing body 21 and the cap 22 . In other words, since the welding margin between the housing body 21 and the cap 22 can be secured, the bonding strength between the housing body 21 and the cap 22 can be easily secured.
  • ribs 22 a are formed on the outer periphery of the cap 22 to extend in the direction in which the cap 22 is inserted into the housing body 21 .
  • a groove 21f is formed on the inner periphery of the housing body 21 to allow passage of the rib 22a.
  • the ribs 22a are provided so as to continue to the corners 22b. Therefore, when the corner portion 22b is melted, the melted synthetic resin enters the gap between the rib 22a and the groove portion 21f to fill the gap, thereby further improving the bonding strength between the cap 22 and the housing body 21.
  • the number, thickness, and length of the ribs 22a and grooves 21f can be changed as appropriate. Furthermore, the ribs 22a and grooves 21f may be omitted.
  • the lower end of the inner peripheral portion 43a is located at the same level as or higher than the lower end of the inner annular portion 41b.
  • the lower end of the inner peripheral portion 43a may protrude downward from the lower end of the inner annular portion 41b. All other configurations of the pressure reducing valve 1 of this modified example are the same as those of the first embodiment, and the same effects are achieved.
  • valve seat 41 Valve seat frame (synthetic resin member of the first embodiment) 41a outer ring portion 41b inner ring portion 41c bridge portion 41f second drop-off preventing portion 41g flat surface 42 O-ring 43 lid member 43a closing plate portion 43b inner peripheral portion 43c first drop-off preventing portion 5 biasing member 6 spring seat (other implementation shape synthetic resin member) 6a sealing member 6b sealing member 7 holder (synthetic resin member of another embodiment) 8 dimension adjusting projection 9 tapered surface 10 first welding part 11 second welding part x dimension y dimension

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Pressure (AREA)
  • Safety Valves (AREA)

Abstract

Provided are: a pressure reducing valve that is made of a synthetic resin and that can be easily dimensionally managed; and a manufacturing method therefor.　A pressure reducing valve 1 according to the present invention comprises: a housing 2 having an inlet 2a and an outlet 2b and allowing a fluid flowing in through the inlet 2a to pass through the inside and flow out through the outlet 2b; a valve body 3 movably housed in the housing 2; a valve seat 4 installed in the housing 2; and a biasing member 5 that biases the valve body 3 in a direction away from the valve seat 4. The pressure reducing valve is configured such that an increase in pressure of the fluid at the outlet causes the valve body 3 to abut against the valve seat 4 countering a biasing force of the biasing member 5, thereby enabling cutting-off of flowing of the fluid in the housing 2. The housing 2 is provided with a housing body 21 and a cap 22, and the cap 22 is welded to a synthetic resin member (valve seat frame body 41).

Description

減圧弁、及びその製造方法Pressure reducing valve and manufacturing method thereof
　本発明は、減圧弁、及びその製造方法に関する。 The present invention relates to a pressure reducing valve and its manufacturing method.
　従来、シャワー等の吐水具に通じる流路に設けられていて、下流側の圧力が上昇すると開口を絞って下流側の圧力を減少させ、下流側の圧力を適切な圧力に調整する減圧弁が知られている（例えば、特許文献１参照）。 Conventionally, there is a pressure reducing valve that is installed in a flow path that leads to a water discharge device such as a shower. known (see, for example, Patent Document 1).
　一般的に、減圧弁は、ハウジングを備え、ハウジングは、円筒状のハウジング本体と、ハウジング本体内の部品の脱落を防ぐキャップとを備えている。ここで、減圧弁は、ハウジング本体とキャップに挟まれて固定される部品の寸法のバラつきにより、個々の減圧弁の寸法がバラついて、個々の減圧弁ごとの寸法に差が生じてしまう。これを防止すべく、従来の減圧弁では、弁座の一部を構成する金属製の弁座枠体の一部を押し潰して減圧弁の寸法を調整していた。 Generally, a pressure reducing valve has a housing, and the housing has a cylindrical housing body and a cap that prevents parts inside the housing body from coming off. Here, in the pressure reducing valve, the dimensions of the individual pressure reducing valves vary due to variations in the dimensions of the parts fixed between the housing body and the cap, resulting in differences in the dimensions of the individual pressure reducing valves. In order to prevent this, in the conventional pressure reducing valve, the size of the pressure reducing valve is adjusted by crushing a portion of a metal valve seat frame that constitutes a portion of the valve seat.
　ところが、減圧弁を合成樹脂で製造する場合には、弁座枠体の一部を押し潰すことはできず、減圧弁の寸法管理が困難となってしまう。 However, if the pressure reducing valve is made of synthetic resin, part of the valve seat frame cannot be crushed, making it difficult to control the dimensions of the pressure reducing valve.
　本発明は、以上の点に鑑み、寸法管理が容易な合成樹脂製の減圧弁及びその製造方法を提供することを目的とする。 In view of the above points, it is an object of the present invention to provide a pressure reducing valve made of synthetic resin and a method of manufacturing the same, which facilitates dimensional control.
　［１］上記目的を達成するため、本発明の減圧弁（例えば、実施形態の減圧弁１。以下同一。）は、
　流入口と流出口とを有して、前記流入口から流入した流体が内部を通って前記流出口から流出可能な合成樹脂製のハウジング（例えば、実施形態のハウジング２。以下同一。）と、
　前記ハウジング内に移動可能に収容された弁体（例えば、実施形態の弁体３。以下同一。）と、
　前記ハウジング内に設けられた弁座（例えば、実施形態の弁座４。以下同一。）と、
　前記弁体を前記弁座から離隔する方向に付勢する付勢部材（例えば、実施形態の付勢部材５。以下同一。）と、
　を備え、
　前記流出口の流体の圧力が高まることにより前記弁体が前記付勢部材の付勢力に抗して前記弁座に当接して前記ハウジング内の流体の流れを遮断可能な減圧弁であって、
　前記ハウジングは、ハウジング本体（例えば、実施形態のハウジング本体２１。以下同一。）とキャップ（例えば、実施形態のキャップ２２。以下同一。）とを備え、
　前記ハウジング本体と前記キャップとの間に挟まれるように合成樹脂製部材（例えば、実施形態の弁座枠体４１。以下同一。）が配置され、
　前記キャップは前記合成樹脂製部材に溶着されていることを特徴とする。 [1] In order to achieve the above object, the pressure reducing valve of the present invention (for example, the pressure reducing valve 1 of the embodiment; the same shall apply hereinafter)
a synthetic resin housing (for example, the housing 2 of the embodiment; the same shall apply hereinafter) having an inflow port and an outflow port, and through which the fluid flowing in from the inflow port can flow out from the outflow port;
a valve body (for example, the valve body 3 of the embodiment; hereinafter the same) movably accommodated in the housing;
a valve seat provided in the housing (for example, the valve seat 4 of the embodiment; the same shall apply hereinafter);
a biasing member (for example, the biasing member 5 of the embodiment; the same shall apply hereinafter) that biases the valve body in a direction away from the valve seat;
with
A pressure reducing valve capable of shutting off the flow of fluid in the housing by causing the valve body to come into contact with the valve seat against the biasing force of the biasing member when the pressure of the fluid in the outflow port increases,
The housing includes a housing body (for example, the housing body 21 of the embodiment; the same shall apply hereinafter) and a cap (for example, the cap 22 of the embodiment; the same shall apply hereinafter),
A synthetic resin member (for example, the valve seat frame 41 of the embodiment; the same shall apply hereinafter) is arranged so as to be sandwiched between the housing body and the cap,
The cap is welded to the synthetic resin member.
　［５］また、本発明の減圧弁の製造方法は、
流入口と流出口とを有して、前記流入口から流入した流体が内部を通って前記流出口から流出可能なハウジングと、
　前記ハウジング内に移動可能に収容された弁体と、
　前記ハウジング内に設けられた弁座と、
　前記弁体を前記弁座から離隔する方向に付勢する付勢部材と、
　を備え、
　前記流出口の流体の圧力が高まることにより前記弁体が前記付勢部材の付勢力に抗して前記弁座に当接して前記ハウジング内の流体の流れを遮断可能な減圧弁の製造方法であって、
　前記ハウジングは、ハウジング本体とキャップとを備え、
前記ハウジング本体と前記キャップとの間に挟まれるように合成樹脂製部材が配置され、
前記キャップと前記合成樹脂製部材との当接部を超音波で加振して溶融させることを特徴とする。 [5] Further, the manufacturing method of the pressure reducing valve of the present invention comprises:
a housing having an inflow port and an outflow port, through which the fluid flowing in from the inflow port can flow out from the outflow port;
a valve body movably accommodated in the housing;
a valve seat provided within the housing;
a biasing member that biases the valve body in a direction away from the valve seat;
with
A method for manufacturing a pressure reducing valve, wherein when the pressure of the fluid in the outflow port increases, the valve body contacts the valve seat against the biasing force of the biasing member to block the flow of the fluid in the housing. There is
The housing comprises a housing body and a cap,
A synthetic resin member is arranged so as to be sandwiched between the housing body and the cap,
It is characterized in that the abutting portion between the cap and the synthetic resin member is melted by vibrating with ultrasonic waves.
　本発明によれば、キャップと合成樹脂製部材との溶着量、又は、キャップと合成樹脂製部材との当接部の溶融量を調整することにより減圧弁の寸法調整を行うことができる。したがって、合成樹脂製の減圧弁であっても、金属製の減圧弁のように弁座の一部を押し潰すことなく、寸法調整を行うことができ、減圧弁の寸法管理を容易にできる。 According to the present invention, the size of the pressure reducing valve can be adjusted by adjusting the amount of welding between the cap and the synthetic resin member or the amount of melting of the contact portion between the cap and the synthetic resin member. Therefore, even if the pressure reducing valve is made of synthetic resin, it is possible to adjust the size without crushing a part of the valve seat unlike the pressure reducing valve made of metal, and the size of the pressure reducing valve can be easily controlled.
　［２］［６］また、本発明の減圧弁又はその製造方法においては、
前記弁座は、前記弁体と接触可能なシート部材（例えば、実施形態のＯリング４２。以下同一。）と、前記シート部材を保持する弁座枠体（例えば、実施形態の弁座枠体４１。以下同一。）とを備えており、
　前記弁座枠体が前記合成樹脂製部材であってもよい。 [2] [6] Further, in the pressure reducing valve or the manufacturing method thereof of the present invention,
The valve seat includes a seat member (for example, the O-ring 42 of the embodiment; hereinafter the same) that can come into contact with the valve body, and a valve seat frame that holds the seat member (for example, the valve seat frame of the embodiment). 41. Same below.) and
The valve seat frame may be the synthetic resin member.
　かかる構成によれば、弁座を構成する弁座枠体を寸法調整用の合成樹脂部材として利用できるので、減圧弁の部品数が増加するのを抑制できる。 According to this configuration, the valve seat frame that constitutes the valve seat can be used as a synthetic resin member for size adjustment, so an increase in the number of parts of the pressure reducing valve can be suppressed.
　［３］また、本発明の減圧弁においては、前記キャップ又は前記合成樹脂製部材は寸法調節用突起を有し、
　前記寸法調節用突起を溶融することで前記キャップと前記合成樹脂製部材とが溶着されてもよい。 [3] Further, in the pressure reducing valve of the present invention, the cap or the synthetic resin member has a projection for size adjustment,
The cap and the synthetic resin member may be welded together by melting the dimension adjusting projection.
　［７］また、本発明の減圧弁の製造方法においては、前記キャップ又は前記合成樹脂製部材が前記当接部に寸法調節用突起を有し、
　前記キャップを超音波で加振することで前記寸法調節用突起が溶融するようにしてもよい。 [7] In the pressure reducing valve manufacturing method of the present invention, the cap or the synthetic resin member has a dimension adjusting projection on the contact portion,
The dimension adjusting projection may be melted by vibrating the cap with ultrasonic waves.
　かかる構成によれば、寸法調節用突起の溶融により、減圧弁の寸法調節ができる。そして、寸法調節用突起は凸形状を有し、このような形状によれば、相手方の接触部分と比較して寸法調節用突起を積極的に溶融させることができ、減圧弁の寸法調節を容易にできる。 According to this configuration, the dimensions of the pressure reducing valve can be adjusted by melting the dimension adjusting projections. The size adjusting protrusion has a convex shape, and according to such a shape, the size adjusting protrusion can be melted more actively than the mating contact portion, and the size adjustment of the pressure reducing valve can be easily performed. can be done.
　［４］［８］また、本発明の減圧弁又はその製造方法においては、前記寸法調整用突起が形成された前記キャップと前記合成樹脂製の何れか一方は、他方よりも溶けやすい素材で形成されていてもよい。 [4][8] Further, in the pressure reducing valve or the manufacturing method thereof according to the present invention, either the cap having the dimension adjusting projection or the synthetic resin is made of a material that melts more easily than the other. may have been
　かかる構成によれば、寸法調節用突起をより積極的に溶融させることができるので、減圧弁の寸法調節を一層容易にできる。 According to this configuration, the size adjustment projection can be melted more positively, so the size adjustment of the pressure reducing valve can be made easier.
　［９］また、本発明の減圧弁の製造方法においては、前記ハウジング本体と前記キャップとの超音波溶着を開始した後に、前記キャップと前記合成樹脂部材との当該当接部の溶融が開始されてもよい。 [9] Further, in the manufacturing method of the pressure reducing valve of the present invention, after starting ultrasonic welding between the housing body and the cap, melting of the contact portion between the cap and the synthetic resin member is started. may
　かかる構成によれば、ハウジング本体とキャップとの溶着代を確保できるので、ハウジング本体とキャップとの接合強度を確保しやすい。 According to such a configuration, it is possible to secure the welding margin between the housing body and the cap, so it is easy to secure the bonding strength between the housing body and the cap.
本発明の第１実施の形態に係る減圧弁の開弁状態を示す説明図。FIG. 4 is an explanatory diagram showing an open state of the pressure reducing valve according to the first embodiment of the present invention; 本発明の第１実施の形態に係る減圧弁の閉弁状態を示す説明図。FIG. 4 is an explanatory diagram showing a closed state of the pressure reducing valve according to the first embodiment of the present invention; 本発明の第１実施の形態に係る減圧弁のキャップを示す斜視図。1 is a perspective view showing a cap of a pressure reducing valve according to a first embodiment of the invention; FIG. 本発明の第１実施の形態に係る減圧弁のハウジング本体を示す斜視図1 is a perspective view showing a housing body of a pressure reducing valve according to a first embodiment of the present invention; FIG. 本発明の第１実施の形態に係る減圧弁のキャップとハウジング本体との溶着開始前の状態を示す説明図。FIG. 4 is an explanatory view showing a state before starting welding between the cap and the housing body of the pressure reducing valve according to the first embodiment of the present invention; 本発明の第１実施の形態に係る減圧弁のキャップとハウジング本体との溶着開始時の状態を示す説明図。FIG. 4 is an explanatory diagram showing a state at the start of welding between the cap and the housing body of the pressure reducing valve according to the first embodiment of the present invention; 本発明の第１実施の形態に係る減圧弁のキャップと弁座枠体との溶着開始時の状態を示す説明図。FIG. 5 is an explanatory view showing a state at the start of welding between the cap and the valve seat frame of the pressure reducing valve according to the first embodiment of the present invention; 本発明の第１実施の形態に係る減圧弁の寸法調節用突起の溶融量が少ない状態を示す説明図。FIG. 5 is an explanatory diagram showing a state in which the amount of melted dimension adjusting projection of the pressure reducing valve according to the first embodiment of the present invention is small; 本発明の第１実施の形態に係る減圧弁の寸法調節用突起の溶融量が多い状態を示す説明図。FIG. 5 is an explanatory diagram showing a state in which a large amount of melt is present in the dimension adjusting projection of the pressure reducing valve according to the first embodiment of the present invention; 本発明の第１実施の形態に係る減圧弁の変形例を示す説明図。FIG. 5 is an explanatory diagram showing a modification of the pressure reducing valve according to the first embodiment of the present invention;
　図１から図９を参照して、本発明の第１実施の形態に係る減圧弁１について説明する。　図１及び図２を参照して、第１実施形態の減圧弁１は、流入口２ａと流出口２ｂを有し合成樹脂製で円筒形状のハウジング２と、ハウジング２内に中心軸線方向に摺動自在に配置された合成樹脂製で円筒形状の弁体３と、弁体３が接触したり離隔したりする弁座４と、弁体３を弁座４から離隔する方向に付勢する付勢部材５（例えば、コイルバネ。）と、付勢部材５の一端を支持するバネ座６と、バネ座６に積層されるホルダ７と、を備える。以下、説明の便宜上、減圧弁１の図１，２の上下を単に「上」、「下」という。 A pressure reducing valve 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 9. FIG. Referring to FIGS. 1 and 2, a pressure reducing valve 1 of the first embodiment comprises a synthetic resin cylindrical housing 2 having an inlet 2a and an outlet 2b, and a housing 2 which slides in the housing 2 in the central axis direction. A cylindrical valve body 3 made of synthetic resin that is movably arranged, a valve seat 4 with which the valve body 3 contacts and separates, and a biasing member that urges the valve body 3 in a direction away from the valve seat 4. A biasing member 5 (for example, a coil spring), a spring seat 6 supporting one end of the biasing member 5 , and a holder 7 stacked on the spring seat 6 are provided. Hereinafter, for convenience of explanation, the top and bottom of the pressure reducing valve 1 in FIGS.
　ハウジング２は、上部が開口し底部２１ｅに流入口２ｂとなる貫通孔２１ａを有する有底筒状のハウジング本体２１と、ハウジング本体２１の上部の開口に取り付けられて、ハウジング本体２１とともにハウジング２内に弁座４、バネ座６、及びホルダ７を固定するキャップ２２と、を備える。キャップ２２には、流入口２ａとなる開口が形成されていて、流体がこの流入口２ａを通じてハウジング２内に流入できる。キャップ２２の開口が設けられている流入口２ａの内周面には、雌ネジが設けられている。 The housing 2 includes a bottomed cylindrical housing body 21 having an open top and a through hole 21a serving as an inlet 2b at a bottom 21e. and a cap 22 for fixing the valve seat 4, the spring seat 6, and the holder 7. The cap 22 is formed with an opening that serves as an inflow port 2a, and fluid can flow into the housing 2 through this inflow port 2a. A female screw is provided on the inner peripheral surface of the inlet 2a where the opening of the cap 22 is provided.
　ハウジング本体２１の内周面には、底部２１ｅ側から小径部２１ｂと、小径部２１ｂよりも大径の大径部２１ｃとが形成されている。小径部２１ｂと大径部２１ｃとの境界に、環状の段部２１ｄが形成されている。ハウジング本体２１の底部２１ｅ側の外周面には、雄ネジが形成されている。この雄ネジが形成された雄ネジ部２１ｇの外径は、ハウジング本体２１の他の部分の外径よりも小さく、雄ネジ部２１ｂとハウジング本体２１の外周面の他の部分との間に環状の外周段部２１ｈが形成されている。減圧弁１において、この外周段部２１ｈからキャップ２２の上端までの寸法ｘが、予め決められた任意の寸法（所定寸法）となるように調節される。 A small-diameter portion 21b and a large-diameter portion 21c having a larger diameter than the small-diameter portion 21b are formed on the inner peripheral surface of the housing body 21 from the side of the bottom portion 21e. An annular stepped portion 21d is formed at the boundary between the small diameter portion 21b and the large diameter portion 21c. A male screw is formed on the outer peripheral surface of the housing main body 21 on the side of the bottom portion 21e. The outer diameter of the male threaded portion 21g formed with this male thread is smaller than the outer diameter of the other portion of the housing body 21, and an annular gap is formed between the male threaded portion 21b and the other portion of the outer peripheral surface of the housing body 21. is formed with an outer peripheral step portion 21h. In the pressure reducing valve 1, the dimension x from the outer peripheral stepped portion 21h to the upper end of the cap 22 is adjusted to a predetermined arbitrary dimension (predetermined dimension).
　キャップ２２は、ハウジング本体２１に超音波溶着されている。また、図３を参照して、キャップ２２の外周面には、径方向外側に向かって突出するリブ２２ａが周方向に間隔を存して配置されている。各リブ２２ａは、ハウジング本体２１へのキャップ２２の挿入方向に延びている。また、図４を参照して、ハウジング本体２１の大径部２１ｃには、リブ２２ａの通過を許容する複数の溝部２１ｆが設けられている。 The cap 22 is ultrasonically welded to the housing body 21 . Further, referring to FIG. 3, on the outer peripheral surface of cap 22, ribs 22a protruding radially outward are arranged at intervals in the circumferential direction. Each rib 22 a extends in the insertion direction of the cap 22 into the housing body 21 . Further, referring to FIG. 4, the large-diameter portion 21c of the housing body 21 is provided with a plurality of groove portions 21f that allow passage of the ribs 22a.
　図１，２を参照して、段部２１ｄには、付勢部材５の上端（一端）が当接する環状のバネ座６と、環状のホルダ７と、弁座４が段部２１ｄ側からこの順に積層されている。そして、バネ座６とホルダ７と弁座４は、段部２１ｄとキャップ２２との間に挟まれて固定される。バネ座６とホルダ７の中心部には、弁体３の後述する筒状部３１が軸方向へ移動自在に挿入される。バネ座６の内周と外周には、弾性を有する環状の封止部材６ａ，６ｂが設けられている。内周側の封止部材６ａは、バネ座６と弁体３の筒状部３１との間を液密に閉塞する。外周側の封止部材６ｂは、バネ座６とハウジング２との間を液密に閉塞する。ホルダ７は封止部材６ａ，６ｂを上側から押さえる。 1 and 2, the stepped portion 21d includes an annular spring seat 6 against which the upper end (one end) of the biasing member 5 abuts, an annular holder 7, and a valve seat 4 from the stepped portion 21d side. They are stacked in order. The spring seat 6, the holder 7 and the valve seat 4 are sandwiched between the stepped portion 21d and the cap 22 and fixed. A tubular portion 31 of the valve body 3, which will be described later, is inserted into the central portion of the spring seat 6 and the holder 7 so as to be axially movable. Elastic ring-shaped sealing members 6 a and 6 b are provided on the inner and outer circumferences of the spring seat 6 . The sealing member 6 a on the inner peripheral side liquid-tightly closes the space between the spring seat 6 and the tubular portion 31 of the valve body 3 . The sealing member 6b on the outer peripheral side seals the gap between the spring seat 6 and the housing 2 in a liquid-tight manner. The holder 7 presses the sealing members 6a and 6b from above.
　弁体３は、断面円形状の筒状部３１と、筒状部３１の中央部分から径方向外側に向かって張り出す張出部３２と、張出部３２の外周縁に設けられた嵌合溝に嵌め込まれ、且つハウジング２の小径部２１ｂと張出部３２との間を液密に閉塞する弾性体で環状の封止部材３２ａと、を備えている。弁体３の筒状部３１は、バネ座６及びホルダ７の中心部に挿通されて、筒状部３１の上端（先端）が弁座４の後述するＯリング４２と対向する。 The valve body 3 includes a cylindrical portion 31 having a circular cross-section, a protruding portion 32 projecting radially outward from the central portion of the cylindrical portion 31 , and a fitting provided on the outer peripheral edge of the protruding portion 32 . An elastic ring-shaped sealing member 32 a is fitted in the groove and liquid-tightly closes the gap between the small diameter portion 21 b of the housing 2 and the projecting portion 32 . The tubular portion 31 of the valve body 3 is inserted through the spring seat 6 and the central portion of the holder 7 , and the upper end (tip) of the tubular portion 31 faces the O-ring 42 of the valve seat 4 , which will be described later.
　弁座４は、合成樹脂製の弁座枠体４１と、シート部材としてのＯリング４２と、合成樹脂製の蓋部材４３と、を備える。弁座枠体４１は、環状の外環部４１ａと、外環部４１ａの内側に間隔を存して配置された内環部４１ｂと、外環部４１ａと内環部４１ｂとを間隔を存して接続するブリッジ部４１ｃと、を備えている。外環部４１ａの外周部がキャップ２２で上方から押さえられている。 The valve seat 4 includes a valve seat frame 41 made of synthetic resin, an O-ring 42 as a seat member, and a cover member 43 made of synthetic resin. The valve seat frame 41 includes an annular outer ring portion 41a, an inner ring portion 41b arranged inside the outer ring portion 41a with a gap therebetween, and a gap between the outer ring portion 41a and the inner ring portion 41b. and a bridge portion 41c that is connected by The outer peripheral portion of the outer ring portion 41a is pressed by a cap 22 from above.
　蓋部材４３は、内環部４１ｂの上縁を閉塞する閉塞板部４３ａと、閉塞板部４３ａの中心から垂下し、Ｏリング４２の中心の孔を通過して伸びる内周部４３ｂと、内周部４３ｂの下端に設けられ、Ｏリング４２の内環部４１ｂからの脱落を阻止するように内周部４３ｂよりも拡径された第１脱落防止部４３ｃと、を備える。閉塞板部４３ａは、内環部４１ｂの上縁に超音波溶着されている。内環部４１ｂの下端には、内周側へ突出する第２脱落防止部（符示せず）が設けられ、Ｏリング４２は、第１脱落防止部材４３ｃと第２脱落防止部によって、弁体３との当接部を露出させた状態で弁座枠体４１に保持される。 The cover member 43 includes a closing plate portion 43a that closes the upper edge of the inner annular portion 41b, an inner peripheral portion 43b that hangs down from the center of the closing plate portion 43a and extends through the central hole of the O-ring 42, and an inner A first drop-off preventing portion 43c is provided at the lower end of the peripheral portion 43b and has a larger diameter than the inner peripheral portion 43b so as to prevent the O-ring 42 from dropping off from the inner annular portion 41b. The closing plate portion 43a is ultrasonically welded to the upper edge of the inner annular portion 41b. The lower end of the inner ring portion 41b is provided with a second drop-off prevention portion (not shown) that protrudes toward the inner peripheral side. 3 is held by the valve seat frame 41 with its contact portion exposed.
　次に、本実施形態の減圧弁１の作動について説明する。本実施形態の減圧弁１は、図１に一点鎖線で示すように上方から下方に向かって減圧弁１内を流体（例えば、水や湯など）が通過する。弁体３には流出口２ｂ側の圧力によって上方へ押し上げられる力が作用する。そして、流出口２ｂ側の圧力が高まると、弁体３が付勢部材５の付勢力に抗して上方へ移動し、弁体３と弁座４との間の隙間が狭くなり、その隙間を流体が通過する際の圧力損失が大きくなる。これにより、流出口２ｂ側の圧力が低下して、減圧弁１を通過する流体の流量が減少する。弁体３は、流出口２ｂ側の圧力によって押し上げられる力と、付勢部材５の押し下げる力とが釣り合う位置で静止する。なお、流出口２ｂ側の圧力が所定値を超えると、図２に示すように、弁体３の上端縁がＯリング４２に当接して、減圧弁１内の流体の流れが阻止される。 Next, the operation of the pressure reducing valve 1 of this embodiment will be described. In the pressure-reducing valve 1 of this embodiment, fluid (for example, water, hot water, etc.) passes through the pressure-reducing valve 1 from top to bottom as indicated by a dashed line in FIG. A force is applied to the valve body 3 to push it upward by the pressure on the side of the outflow port 2b. Then, when the pressure on the outflow port 2b side increases, the valve body 3 moves upward against the biasing force of the biasing member 5, and the gap between the valve body 3 and the valve seat 4 becomes narrower. pressure loss increases when the fluid passes through As a result, the pressure on the outflow port 2b side decreases, and the flow rate of the fluid passing through the pressure reducing valve 1 decreases. The valve body 3 stops at a position where the force pushed up by the pressure on the outflow port 2b side and the force pushed down by the biasing member 5 are balanced. When the pressure on the outflow port 2b side exceeds a predetermined value, the upper edge of the valve body 3 comes into contact with the O-ring 42 to block the flow of fluid in the pressure reducing valve 1, as shown in FIG.
　次に、第１実施形態の減圧弁１の製造方法について説明する。 Next, a method for manufacturing the pressure reducing valve 1 of the first embodiment will be described.
　減圧弁１は、キャップ２２とハウジング本体２１との溶着部である第一溶着部１０と、キャップ２２と弁座枠体４１との溶着部である第二溶着部１１と、を有する。第一溶着部１０と第二溶着部１１は、超音波溶着により接合される。第１実施形態において、キャップ２２とハウジング本体２１の素材は、ＰＯＭ（ポリアセタール）樹脂である。弁座枠体４１の素材は、ＰＰＳ（ポリフェニレンサルファイド）樹脂であり、キャップ２２は、弁座枠体４１よりも溶けやすい素材である。 The pressure reducing valve 1 has a first welded portion 10 that is a welded portion between the cap 22 and the housing body 21 and a second welded portion 11 that is a welded portion between the cap 22 and the valve seat frame 41 . The first welded part 10 and the second welded part 11 are joined by ultrasonic welding. In the first embodiment, the material of the cap 22 and housing body 21 is POM (polyacetal) resin. The material of the valve seat frame 41 is PPS (polyphenylene sulfide) resin, and the cap 22 is made of a material that melts more easily than the valve seat frame 41 .
　第一溶着部１０は、ハウジング本体２１の上端部内周に位置する。図５を参照して、溶着前の状態で、第一溶着部１０となるハウジング本体２１の上端部内周には、上方へ向かって次第に拡径するテーパ面９が形成されている。また、溶着前の状態で、第一溶着部１０となるキャップ２２の外周には、環状の角部２２ｂが形成されている。この角部２２ｂがテーパ面９に上方から当接する。 The first welded portion 10 is located on the inner periphery of the upper end portion of the housing body 21 . Referring to FIG. 5, a tapered surface 9 whose diameter gradually increases upward is formed on the inner periphery of the upper end portion of the housing body 21 which becomes the first welded portion 10 before welding. Moreover, an annular corner portion 22b is formed on the outer periphery of the cap 22 which becomes the first weld portion 10 before welding. This corner portion 22b contacts the tapered surface 9 from above.
　第二溶着部１１は、弁座枠体４１の外環部４１ａの外周部上端に位置する。図５を参照して、溶着前の状態で、外環部４１ａの外周部には、上方を向く環状の平面４１ｇが形成されている。また、溶着前の状態で、第二溶着部１１となるキャップ２２には、下方へ向かって突出する環状の寸法調節用突起８が設けられている。この寸法調節用突起８の先端が平面４１ｇに上方から当接する。この寸法調節用突起８は、減圧弁１の寸法ｘを所定寸法に調節すべく溶融される箇所であり、場合によってはすべて溶融されて消滅することもある。 The second welded portion 11 is located at the upper end of the outer peripheral portion of the outer ring portion 41 a of the valve seat frame 41 . Referring to FIG. 5, before welding, an annular flat surface 41g facing upward is formed on the outer peripheral portion of the outer annular portion 41a. In addition, the cap 22 that forms the second welded portion 11 before welding is provided with an annular dimension adjusting projection 8 that protrudes downward. The tip of the dimension adjusting projection 8 abuts on the flat surface 41g from above. This dimension adjusting protrusion 8 is a portion that is melted to adjust the dimension x of the pressure reducing valve 1 to a predetermined dimension, and in some cases, it may be entirely melted and disappear.
　このように、キャップ２２の角部２２ｂと寸法調節用突起８がテーパ面９と平面４１ｇのそれぞれに、上方から突き当たる。これらの当接部は、キャップ２２に下向きに力を加えると、同時に加圧することができる。 Thus, the corner 22b of the cap 22 and the dimension adjusting projection 8 abut against the tapered surface 9 and the flat surface 41g from above. These abutments can be pressurized at the same time when a downward force is applied to the cap 22 .
　減圧弁１の溶着前工程の開始時には、図５に示すように、ハウジング本体２１の上端開口からその内側に、弁体３、付勢部材５、バネ座６，ホルダ７、弁座４を挿入し、その上からキャップ２２を被せた状態とする。このような状態では、付勢部材５によりバネ座６、ホルダ７、弁座４が押し上げられて、弁座枠体４１の平面４１ｇにキャップ２１の寸法調節用突起８が突き当てられた状態となる。 At the start of the pre-welding process for the pressure reducing valve 1, as shown in FIG. Then, the cap 22 is put on it. In this state, the spring seat 6, the holder 7, and the valve seat 4 are pushed up by the biasing member 5, and the dimension adjusting projection 8 of the cap 21 abuts against the flat surface 41g of the valve seat frame 41. Become.
　溶着前工程では、キャップ２２に下向きに力を加えて、付勢部材５を圧縮させつつキャップ２２をハウジング本体２１内の下方へ押し込んでいく。溶着準備工程を進めると、図６に示すように、キャップ２２の角部２２ｂがテーパ面９に当接し、溶着第一工程へ移行する。 In the pre-welding process, downward force is applied to the cap 22 to compress the biasing member 5 and push the cap 22 downward into the housing body 21 . As the welding preparation process proceeds, as shown in FIG. 6, the corner 22b of the cap 22 abuts against the tapered surface 9, and the first welding process is started.
　溶着第一工程では、キャップ２２に下向きに力を加えつつ、キャップ２２を超音波で加振する。これにより、キャップ２２の角部２２ｂとハウジング本体２１のテーパ面９との当接部が加圧され、摩擦熱で溶融する。これにより、キャップ２２がハウジング本体２１に超音波溶着されて、第一溶着部１０が形成される。 In the first welding step, the cap 22 is ultrasonically vibrated while applying downward force to the cap 22 . As a result, the contact portion between the corner portion 22b of the cap 22 and the tapered surface 9 of the housing body 21 is pressurized and melted by frictional heat. As a result, the cap 22 is ultrasonically welded to the housing body 21 to form the first welded portion 10 .
　この溶着第一工程では、バネ座６が段部２１ｄから離れている。このため、キャップ２２の寸法調節用突起８と弁座枠体４１の平面４１ｇが当接しているが、その当接部に加わる圧力は、付勢部材５に起因するものであって、溶着が開始されるほどには高くならない。このため、溶着第一工程では、キャップ２２は弁座枠体４１に溶着されず、ハウジング本体２１にのみ溶着される。溶着第一工程を進めると、図７に示すように、バネ座６が段部２１ｄに突き当たり、溶着第二工程へ移行する。 In this first welding step, the spring seat 6 is separated from the stepped portion 21d. Therefore, the dimension adjusting projection 8 of the cap 22 and the flat surface 41g of the valve seat frame 41 are in contact with each other. Not high enough to start. Therefore, in the first welding step, the cap 22 is not welded to the valve seat frame 41 but is welded only to the housing body 21 . As the welding first step proceeds, as shown in FIG. 7, the spring seat 6 abuts against the stepped portion 21d, and the process shifts to the welding second step.
　溶着第二工程では、溶着第一工程から継続してキャップ２２に下向きに力を加えつつ、キャップ２２を超音波で加振する。これにより、第一溶着部１０の溶着が進むとともに、キャップ２２の寸法調節用突起８と弁座枠体４１の平面４１ｇとの当接部が加圧され、摩擦熱で溶融する。これにより、キャップ２２が弁座枠体４１に超音波溶着されて、第二溶着部１１が形成される。 In the second welding process, the cap 22 is ultrasonically vibrated while applying downward force to the cap 22 continuously from the first welding process. As a result, the welding of the first welding portion 10 progresses, and the contact portion between the dimension adjusting projection 8 of the cap 22 and the flat surface 41g of the valve seat frame 41 is pressurized and melted by frictional heat. As a result, the cap 22 is ultrasonically welded to the valve seat frame 41 to form the second welded portion 11 .
　この溶着第二工程では、第一溶着部１０におけるキャップ２２とハウジング本体２１との溶着と、第二溶着部１１におけるキャップ２２と弁座枠体４１との溶着とが同時進行する。第二溶着工程を進めて減圧弁１の寸法ｘが所定寸法となったら、キャップ２２への加振を停止する。これにより、溶着工程が終了し、減圧弁１が完成する。 In this second welding step, the welding of the cap 22 and the housing body 21 at the first welding portion 10 and the welding of the cap 22 and the valve seat frame 41 at the second welding portion 11 proceed simultaneously. When the second welding step proceeds and the dimension x of the pressure reducing valve 1 reaches a predetermined dimension, the vibration of the cap 22 is stopped. As a result, the welding process is completed, and the pressure reducing valve 1 is completed.
　所定寸法となった減圧弁１において、ハウジング２内に収容されてキャップ２２と段部２１ｄとで挟まれる部品（バネ座６、ホルダ７、及び弁座枠体４１）の寸法ｙが小さい場合には、図８に示すように、寸法調節用突起８の溶融量が少ない。その一方、ハウジング２内に収容されてキャップ２２と段部２１ｄとで挟まれる部品の寸法ｙが大きい場合には、図９に示すように、寸法調節用突起８の溶融量が多い。 In the pressure reducing valve 1 having a predetermined size, when the dimension y of the parts (the spring seat 6, the holder 7, and the valve seat frame 41) housed in the housing 2 and sandwiched between the cap 22 and the stepped portion 21d is small. , as shown in FIG. 8, the amount of melting of the dimension adjusting projection 8 is small. On the other hand, when the dimension y of the part housed in the housing 2 and sandwiched between the cap 22 and the stepped portion 21d is large, as shown in FIG.
　以上、説明したように、第１実施形態の減圧弁１は、流入口２ａと流出口２ｂとを有して、流入口２ａから流入した流体が内部を通って流出口２ｂから流出可能な合成樹脂製のハウジング２と、ハウジング２内に移動可能に収容された弁体３と、ハウジング２内に設けられた弁座４と、弁体３を弁座４から離隔する方向に付資する付勢部材５と、を備える。減圧弁１は、流出口２ｂの流体の圧力が高まることにより弁体３が付勢部材５の付勢力に抗して弁座４に当接してハウジング２内の流体の流れを遮断可能である。 As described above, the pressure reducing valve 1 of the first embodiment has the inflow port 2a and the outflow port 2b. A housing 2 made of resin, a valve body 3 movably accommodated in the housing 2, a valve seat 4 provided in the housing 2, and a biasing force that biases the valve body 3 away from the valve seat 4. a member 5; In the pressure reducing valve 1, when the pressure of the fluid in the outflow port 2b increases, the valve body 3 can be brought into contact with the valve seat 4 against the biasing force of the biasing member 5 to block the flow of the fluid in the housing 2. .
　ハウジング２は、ハウジング本体２１とキャップ２２とを備える。ハウジング本体２１とキャップとの間に挟まれるように弁座枠体４１（合成樹脂製部材）が配置される。第１実施形態の減圧弁１によれば、キャップ２２は弁座枠体４１に溶着される。また、第１実施形態の減圧弁１の製造方法によれば、キャップ２２と弁座枠体４１との当接部を超音波で加振して溶融させる。 The housing 2 includes a housing body 21 and a cap 22. A valve seat frame 41 (synthetic resin member) is arranged so as to be sandwiched between the housing body 21 and the cap. According to the pressure reducing valve 1 of the first embodiment, the cap 22 is welded to the valve seat frame 41 . Further, according to the manufacturing method of the pressure reducing valve 1 of the first embodiment, the abutting portion between the cap 22 and the valve seat frame 41 is fused by ultrasonic vibration.
　これにより、キャップ２２と弁座枠体４１との溶着量、又はキャップ２２と弁座枠体４１との当接部の溶融量を調節することで、減圧弁１の寸法ｘの調節が可能になる。従って、合成樹脂製の減圧弁であっても、金属製の減圧弁のように弁座の一部を押しつぶすことなく、寸法調節を行うことができ、減圧弁１の寸法管理を容易にできる。 This makes it possible to adjust the dimension x of the pressure reducing valve 1 by adjusting the amount of welding between the cap 22 and the valve seat frame 41 or the amount of melting of the contact portion between the cap 22 and the valve seat frame 41. Become. Therefore, even if the pressure reducing valve is made of synthetic resin, the size of the pressure reducing valve 1 can be easily controlled without crushing a part of the valve seat unlike the pressure reducing valve made of metal.
　なお、第１実施形態では減圧弁１の外周段部２１ｈからキャップ２２の上端までの寸法ｘを所定寸法となるように調節しているが、本発明の減圧弁の寸法調節はこれに限られない。例えば、本発明によって調節される減圧弁の寸法は、減圧弁の全長であってもよく、減圧弁の上下方向（軸方向）の寸法であれば調節できる。さらに、寸法調節のため、キャップ２２又は弁座枠体４１の少なくとも一方が溶融すればよく、キャップ２２と弁座枠体４１とが必ずしも接合されなくてもよい。 In the first embodiment, the dimension x from the outer peripheral stepped portion 21h of the pressure reducing valve 1 to the upper end of the cap 22 is adjusted to a predetermined dimension, but the dimension adjustment of the pressure reducing valve of the present invention is limited to this. do not have. For example, the dimension of the pressure reducing valve to be adjusted according to the present invention may be the entire length of the pressure reducing valve, and any vertical (axial) dimension of the pressure reducing valve can be adjusted. Furthermore, for dimensional adjustment, at least one of the cap 22 and the valve seat frame 41 may be melted, and the cap 22 and the valve seat frame 41 do not necessarily have to be joined.
　また、第１実施形態の減圧弁１、及びその製造方法によれば、弁座４は、弁体３と接触可能なＯリング４２（シート部材）とＯリング４２を保持する弁座枠体４１とを備える。この弁座枠体４１が合成樹脂製部材である。これにより、弁座４を構成する弁座枠体４１を寸法調節用の合成樹脂製部材として利用できるので、減圧弁１の部品数が増えるのを抑制できる。 Further, according to the pressure reducing valve 1 of the first embodiment and the manufacturing method thereof, the valve seat 4 includes an O-ring 42 (seat member) capable of coming into contact with the valve body 3 and a valve seat frame 41 holding the O-ring 42. and This valve seat frame 41 is a synthetic resin member. As a result, the valve seat frame 41 forming the valve seat 4 can be used as a synthetic resin member for size adjustment, so that the increase in the number of parts of the pressure reducing valve 1 can be suppressed.
　第１実施形態では、合成樹脂製部材として弁座枠体４１が利用されるが、本発明の合成樹脂製部材としては弁座枠体４１に限られない。例えば、バネ座６やホルダ７を本発明の合成樹脂製部材としてもよく、又はワッシャ、スペーサなどを弁座枠体４１に積層して、本発明の合成樹脂製部材としてもよい。 Although the valve seat frame 41 is used as the synthetic resin member in the first embodiment, the synthetic resin member of the present invention is not limited to the valve seat frame 41 . For example, the spring seat 6 and holder 7 may be the synthetic resin members of the present invention, or washers, spacers, and the like may be layered on the valve seat frame 41 to form the synthetic resin members of the present invention.
　また、キャップ２２が寸法調節用突起８を有する。そして、第１実施形態の減圧弁１では、キャップ２２が寸法調節用突起８を溶融することで弁座枠体４１と溶着される。また、第１実施形態の減圧弁１の製造方法によれば、キャップ２２を超音波で加振することで寸法調節用突起８が溶融する。かかる構成によれば、寸法調節用突起８の溶融により、減圧弁１の寸法調節ができる。そして、寸法調節用突起８が凸形状を有する。このような形状によれば、寸法調節用突起８を積極的に溶融させることができるので、減圧弁１の寸法調節を容易にできる。 Also, the cap 22 has a dimension adjusting projection 8. In the pressure reducing valve 1 of the first embodiment, the cap 22 is welded to the valve seat frame 41 by melting the dimension adjusting projection 8 . Further, according to the manufacturing method of the pressure reducing valve 1 of the first embodiment, the dimension adjusting projection 8 is melted by vibrating the cap 22 with ultrasonic waves. According to this configuration, the size of the pressure reducing valve 1 can be adjusted by melting the size adjusting projection 8 . Then, the dimension adjusting protrusion 8 has a convex shape. With such a shape, the size adjustment projection 8 can be actively melted, so the size adjustment of the pressure reducing valve 1 can be facilitated.
　第１実施形態では、寸法調節用突起８がキャップ２２に設けられているが、本発明の寸法調節用突起は、合成樹脂製部材に設けられていてもよい。第１実施形態では、寸法調節用突起８は環状であるが、本発明の寸法調節用突起はこれに限らず、例えば、円弧状であってもよく、又は同一円周上に配置される複数の突部であってもよい。さらには、キャップ又は合成樹脂製部材が溶融して寸法調整ができればよいため、寸法調節用突起はなくてもよい。 In the first embodiment, the dimension adjusting projection 8 is provided on the cap 22, but the dimension adjusting projection of the present invention may be provided on a synthetic resin member. In the first embodiment, the dimension adjusting projection 8 is annular, but the dimension adjusting projection of the present invention is not limited to this. may be a protrusion of Furthermore, since it is sufficient that the size can be adjusted by melting the cap or the synthetic resin member, the size adjustment projection may be omitted.
　また、寸法調節用突起８が形成されているキャップ２２は、弁座枠体４１（弁座４の合成樹脂製部材）よりも溶けやすい素材で形成されている。例えば、キャップ２２とハウジング本体２１は、ＰＯＭ（ポリアセタール）樹脂で形成され、弁座枠体４１（弁座４の合成樹脂製部材）はＰＰＳ（ポリフェニレンサルファイド）樹脂で形成されている。これにより、寸法調節用突起８をより積極的に溶融させることができるので、減圧弁１の寸法調節を容易にできる。 Also, the cap 22 on which the dimension adjusting projection 8 is formed is made of a material that melts more easily than the valve seat frame 41 (synthetic resin member of the valve seat 4). For example, the cap 22 and the housing body 21 are made of POM (polyacetal) resin, and the valve seat frame 41 (synthetic resin member of the valve seat 4) is made of PPS (polyphenylene sulfide) resin. As a result, the size adjusting projection 8 can be melted more positively, so the size adjustment of the pressure reducing valve 1 can be facilitated.
　なお、本発明において、寸法調節用突起を合成樹脂製部材に設ける場合には、合成樹脂製部材をキャップよりも溶けやすい素材で形成することにより、同様の効果を得られる。 In addition, in the present invention, when the size adjusting projection is provided on the synthetic resin member, the same effect can be obtained by forming the synthetic resin member from a material that melts more easily than the cap.
　一般的に、超音波溶着する場合には、溶着部の接合強度を確保するため、溶着する部材同士の素材を同一にする。寸法調節用突起８は、寸法調節のための溶融を目的とし、接合強度を要しないので、第１実施形態ではキャップ２２と弁座枠体４１とを異なる素材としている。キャップ２２とハウジング本体２１の接合強度を確保するため、これらは同一素材で形成されることが好ましいが、その素材は適宜変更できる。また、本発明の合成樹脂製部材の素材も適宜変更でき、ハウジング２と同一素材であってもよい。 Generally, when ultrasonic welding is used, the materials of the members to be welded are made the same in order to ensure the bonding strength of the welded part. The dimension adjusting projection 8 is intended to be melted for dimension adjustment and does not require bonding strength. Therefore, in the first embodiment, the cap 22 and the valve seat frame 41 are made of different materials. In order to secure the joint strength between the cap 22 and the housing body 21, they are preferably made of the same material, but the material can be changed as appropriate. Also, the material of the synthetic resin member of the present invention can be changed as appropriate, and may be the same material as the housing 2 .
　また、第１実施形態の減圧弁の製造方法によれば、角部２２ｂとテーパ面９とが接触するときにはバネ座６が段部２１ｄから離れているように構成することにより、ハウジング本体２１とキャップ２２との超音波溶着を開始した後に、キャップ２２と弁座枠体４１（合成樹脂製部材）との当接部の溶融が開始される。これにより、ハウジング本体２１とキャップ２２との溶着代を確保した上で、キャップ２２と弁座枠体４１との当接部の溶融量を増減して減圧弁１の寸法調節ができる。つまり、ハウジング本体２１とキャップ２２との溶着代を確保できるので、ハウジング本体２１とキャップ２２との接合強度を確保しやすい。 Further, according to the manufacturing method of the pressure reducing valve of the first embodiment, when the corner portion 22b and the tapered surface 9 are in contact with each other, the spring seat 6 is separated from the stepped portion 21d. After the ultrasonic welding with the cap 22 is started, the contact portion between the cap 22 and the valve seat frame 41 (synthetic resin member) starts to melt. As a result, the size of the pressure reducing valve 1 can be adjusted by increasing or decreasing the amount of melt in the contact portion between the cap 22 and the valve seat frame 41 while securing the welding margin between the housing body 21 and the cap 22 . In other words, since the welding margin between the housing body 21 and the cap 22 can be secured, the bonding strength between the housing body 21 and the cap 22 can be easily secured.
　また、第１実施形態では、キャップ２２の外周には、ハウジング本体２１へのキャップ２２の挿入方向に延びるリブ２２ａが形成されている。ハウジング本体２１の内周には、リブ２２ａの通過を許容する溝部２１ｆが形成されている。このように、リブ２２ａが溝部２１ｆに入り込むことで、キャップ２２がハウジング本体２１に周り止めされて、キャップ２２とハウジング本体２１の接合強度を向上できる。 In addition, in the first embodiment, ribs 22 a are formed on the outer periphery of the cap 22 to extend in the direction in which the cap 22 is inserted into the housing body 21 . A groove 21f is formed on the inner periphery of the housing body 21 to allow passage of the rib 22a. By inserting the ribs 22a into the grooves 21f in this way, the cap 22 is prevented from rotating by the housing body 21, and the joint strength between the cap 22 and the housing body 21 can be improved.
　さらに、第１実施形態では、リブ２２ａが角部２２ｂに連なるように設けられている。このため、角部２２ｂが溶融されたとき、溶けた合成樹脂がリブ２２ａと溝部２１ｆとの隙間に入り込み、隙間が埋まることで、キャップ２２とハウジング本体２１の接合強度を一層向上できる。なお、リブ２２ａ及び溝部２１ｆの数、太さ、長さは適宜変更できる。さらに、リブ２２ａ及び溝部２１ｆを省略してもよい。 Furthermore, in the first embodiment, the ribs 22a are provided so as to continue to the corners 22b. Therefore, when the corner portion 22b is melted, the melted synthetic resin enters the gap between the rib 22a and the groove portion 21f to fill the gap, thereby further improving the bonding strength between the cap 22 and the housing body 21. The number, thickness, and length of the ribs 22a and grooves 21f can be changed as appropriate. Furthermore, the ribs 22a and grooves 21f may be omitted.
　また、第１実施形態では、内周部４３ａの下端が内環部４１ｂの下端と同じか、それよりも上側に位置する。これにより、弁体３の筒状部３１の先端がＯリングに接近したときに、通水抵抗が大きくなり過ぎて負圧が発生し、異音が発生するのを抑制できる。なお、図１０の変形例に示すように、内周部４３ａの下端が内環部４１ｂの下端から下方へ突出してもよい。本変形例の減圧弁１の他の構成はすべて第１実施形態と同一であり、同一の作用効果を奏する。 Further, in the first embodiment, the lower end of the inner peripheral portion 43a is located at the same level as or higher than the lower end of the inner annular portion 41b. As a result, when the tip of the tubular portion 31 of the valve body 3 approaches the O-ring, it is possible to suppress the generation of negative pressure and abnormal noise due to excessive water flow resistance. In addition, as shown in the modification of FIG. 10, the lower end of the inner peripheral portion 43a may protrude downward from the lower end of the inner annular portion 41b. All other configurations of the pressure reducing valve 1 of this modified example are the same as those of the first embodiment, and the same effects are achieved.
　以上、第１実施形態及び第２実施形態に係る減圧弁及びその製造方法について説明したが、本発明は、特許請求の範囲の記載から逸脱しない範囲で適宜変更、変形することができる。 Although the pressure reducing valve and the manufacturing method thereof according to the first and second embodiments have been described above, the present invention can be appropriately changed and modified within the scope of the claims.
１　減圧弁
２　ハウジング
２ａ　流入口
２ｂ　流出口
２１　ハウジング本体
２１ａ　貫通孔
２１ｂ　小径部
２１ｃ　大径部
２１ｄ　段部
２１ｅ　底部
２１ｆ　溝部
２１ｇ　雄ネジ部
２１ｈ　外周段部
２２　キャップ
２２ａ　リブ
２２ｂ　角部
３　弁体
３１　筒状部
３２　張出部
３２ａ　封止部材
４　弁座
４１　弁座枠体（第１実施形態の合成樹脂製部材）
４１ａ　外環部
４１ｂ　内環部
４１ｃ　ブリッジ部
４１ｆ　第２脱落防止部
４１ｇ　平面
４２　Ｏリング
４３　蓋部材
４３ａ　閉塞板部
４３ｂ　内周部
４３ｃ　第１脱落防止部
５　付勢部材
６　バネ座（他の実施形態の合成樹脂製部材）
６ａ　封止部材
６ｂ　封止部材
７　ホルダ（他の実施形態の合成樹脂製部材）
８　寸法調節用突起
９　テーパ面
１０　第一溶着部
１１　第二溶着部
ｘ　寸法
ｙ　寸法 1 pressure reducing valve 2 housing 2a inflow port 2b outflow port 21 housing body 21a through hole 21b small diameter portion 21c large diameter portion 21d stepped portion 21e bottom portion 21f groove portion 21g male screw portion 21h outer peripheral stepped portion 22 cap 22a rib 22b corner portion 3 valve body 31 Cylindrical portion 32 Projecting portion 32a Sealing member 4 Valve seat 41 Valve seat frame (synthetic resin member of the first embodiment)
41a outer ring portion 41b inner ring portion 41c bridge portion 41f second drop-off preventing portion 41g flat surface 42 O-ring 43 lid member 43a closing plate portion 43b inner peripheral portion 43c first drop-off preventing portion 5 biasing member 6 spring seat (other implementation shape synthetic resin member)
6a sealing member 6b sealing member 7 holder (synthetic resin member of another embodiment)
8 dimension adjusting projection 9 tapered surface 10 first welding part 11 second welding part x dimension y dimension
特開２０００－３２０７２３号公報JP-A-2000-320723

Claims (9)

  1. 　流入口と流出口とを有して、前記流入口から流入した流体が内部を通って前記流出口から流出可能な合成樹脂製のハウジングと、
    　前記ハウジング内に移動可能に収容された弁体と、
    　前記ハウジング内に設けられた弁座と、
    　前記弁体を前記弁座から離隔する方向に付勢する付勢部材と、
    　を備え、
    　前記流出口の流体の圧力が高まることにより前記弁体が前記付勢部材の付勢力に抗して前記弁座に当接して前記ハウジング内の流体の流れを遮断可能な減圧弁であって、
    　前記ハウジングは、ハウジング本体とキャップとを備え、
    　前記ハウジング本体と前記キャップとの間に挟まれるように合成樹脂製部材が配置され、
    　前記キャップは前記合成樹脂製部材に溶着されていることを特徴とする減圧弁。     a synthetic resin housing having an inflow port and an outflow port, through which the fluid flowing in from the inflow port can flow out from the outflow port;
    a valve body movably accommodated in the housing;
    a valve seat provided within the housing;
    a biasing member that biases the valve body in a direction away from the valve seat;
    with
    A pressure reducing valve capable of shutting off the flow of fluid in the housing by causing the valve body to come into contact with the valve seat against the biasing force of the biasing member when the pressure of the fluid in the outflow port increases,
    The housing comprises a housing body and a cap,
    A synthetic resin member is arranged so as to be sandwiched between the housing body and the cap,
    A pressure reducing valve, wherein the cap is welded to the synthetic resin member.
  2. 　請求項１に記載の減圧弁であって、
    　前記弁座は、前記弁体と接触可能なシート部材と、前記シート部材を保持する弁座枠体とを備えており、
    　前記弁座枠体が前記合成樹脂製部材であることを特徴とする減圧弁。     The pressure reducing valve according to claim 1,
    The valve seat includes a seat member that can contact the valve body, and a valve seat frame that holds the seat member,
    A pressure reducing valve, wherein the valve seat frame is the synthetic resin member.
  3. 　請求項１又は請求項２に記載の減圧弁であって、
    　前記キャップ又は前記合成樹脂製部材は寸法調節用突起を有し、
    　前記キャップは、前記寸法調節用突起を溶融することで前記合成樹脂製部材と溶着されることを特徴とする減圧弁。     The pressure reducing valve according to claim 1 or claim 2,
    The cap or the synthetic resin member has a projection for size adjustment,
    The pressure reducing valve, wherein the cap is welded to the synthetic resin member by melting the dimension adjusting projection.
  4. 　請求項１から請求項３の何れか１項に記載の減圧弁であって、
    　前記寸法調節用突起が形成された前記キャップと前記合成樹脂製部材の何れか一方は、他方よりも溶けやすい素材で形成されていることを特徴とする減圧弁。     The pressure reducing valve according to any one of claims 1 to 3,
    A pressure reducing valve, wherein one of the cap having the dimension adjusting projection and the synthetic resin member is made of a material that melts more easily than the other.
  5. 　流入口と流出口とを有して、前記流入口から流入した流体が内部を通って前記流出口から流出可能なハウジングと、
    　前記ハウジング内に移動可能に収容された弁体と、
    　前記ハウジング内に設けられた弁座と、
    　前記弁体を前記弁座から離隔する方向に付勢する付勢部材と、
    　を備え、
    　前記流出口の流体の圧力が高まることにより前記弁体が前記付勢部材の付勢力に抗して前記弁座に当接して前記ハウジング内の流体の流れを遮断可能な減圧弁の製造方法であって、
    　前記ハウジングは、ハウジング本体とキャップとを備え、
    　前記ハウジング本体と前記キャップとの間に挟まれるように合成樹脂製部材が配置され、
    　前記キャップと前記合成樹脂製部材との当接部を超音波で加振して溶融させることを特徴とする減圧弁の製造方法。     a housing having an inflow port and an outflow port, through which the fluid flowing in from the inflow port can flow out from the outflow port;
    a valve body movably accommodated in the housing;
    a valve seat provided within the housing;
    a biasing member that biases the valve body in a direction away from the valve seat;
    with
    A method for manufacturing a pressure reducing valve, wherein when the pressure of the fluid in the outflow port increases, the valve body contacts the valve seat against the biasing force of the biasing member to block the flow of the fluid in the housing. There is
    The housing comprises a housing body and a cap,
    A synthetic resin member is arranged so as to be sandwiched between the housing body and the cap,
    A method of manufacturing a pressure reducing valve, wherein a contact portion between the cap and the synthetic resin member is melted by vibrating with ultrasonic waves.
  6. 　請求項５に記載の減圧弁の製造方法であって、
    　前記弁座は、前記弁体と当接可能なシート部材と、前記シート部材を保持する弁座枠体と、を備え、
    　前記弁座枠体が前記合成樹脂製部材であることを特徴とする減圧弁の製造方法。     A method for manufacturing a pressure reducing valve according to claim 5,
    The valve seat includes a seat member that can contact the valve body, and a valve seat frame that holds the seat member,
    A method of manufacturing a pressure reducing valve, wherein the valve seat frame is the synthetic resin member.
  7. 　請求項５又は請求項６に記載の減圧弁の製造方法であって、
    　前記キャップ又は前記合成樹脂製部材が前記当接部に寸法調節用突起を有し、
    　前記キャップを超音波で加振することで前記寸法調節用突起が溶融することを特徴とする減圧弁の製造方法。     A method for manufacturing a pressure reducing valve according to claim 5 or 6,
    The cap or the synthetic resin member has a projection for size adjustment on the contact portion,
    A method of manufacturing a pressure reducing valve, wherein the dimension adjusting protrusion is melted by vibrating the cap with ultrasonic waves.
  8. 　請求項５から請求項７の何れか１項に記載の減圧弁の製造方法であって、
    　前記寸法調節用突起が形成される前記キャップ又は前記合成樹脂製部材の何れか一方は、他方よりも溶けやすい素材で形成されていることを特徴とする減圧弁の製造方法。     A method for manufacturing a pressure reducing valve according to any one of claims 5 to 7,
    A method of manufacturing a pressure reducing valve, wherein either the cap on which the dimension adjusting projection is formed or the synthetic resin member is made of a material that melts more easily than the other.
  9. 　請求項５から請求項８の何れか１項に記載の減圧弁の製造方法であって、
    　前記ハウジング本体と前記キャップとの超音波溶着を開始した後に、前記キャップと前記合成樹脂製部材との前記当接部の溶融が開始されることを特徴とする減圧弁の製造方法。     A method for manufacturing a pressure reducing valve according to any one of claims 5 to 8,
    A method of manufacturing a pressure reducing valve, wherein the contact portion between the cap and the synthetic resin member is started to melt after ultrasonic welding between the housing body and the cap is started.
PCT/JP2022/021100 2021-08-31 2022-05-23 Pressure reducing valve and manufacturing method therefor WO2023032359A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009085301A (en) * 2007-09-28 2009-04-23 Fuji Koki Corp Synthetic resin housing for valve apparatus
WO2020032156A1 (en) * 2018-08-09 2020-02-13 イーグル工業株式会社 Decompression valve
JP2020041616A (en) * 2018-09-11 2020-03-19 株式会社ニッキ regulator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009085301A (en) * 2007-09-28 2009-04-23 Fuji Koki Corp Synthetic resin housing for valve apparatus
WO2020032156A1 (en) * 2018-08-09 2020-02-13 イーグル工業株式会社 Decompression valve
JP2020041616A (en) * 2018-09-11 2020-03-19 株式会社ニッキ regulator

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