WO2022102123A1 - 逆止弁 - Google Patents

逆止弁 Download PDF

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Publication number
WO2022102123A1
WO2022102123A1 PCT/JP2020/042603 JP2020042603W WO2022102123A1 WO 2022102123 A1 WO2022102123 A1 WO 2022102123A1 JP 2020042603 W JP2020042603 W JP 2020042603W WO 2022102123 A1 WO2022102123 A1 WO 2022102123A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve body
check valve
valve
guide
guide member
Prior art date
Application number
PCT/JP2020/042603
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English (en)
French (fr)
Japanese (ja)
Inventor
充宏 池田
雄大 森川
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2020/042603 priority Critical patent/WO2022102123A1/ja
Priority to JP2022561240A priority patent/JP7361946B2/ja
Publication of WO2022102123A1 publication Critical patent/WO2022102123A1/ja

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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
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems

Definitions

  • This disclosure relates to a check valve attached to a refrigerant pipe of a refrigerating cycle of an air conditioner.
  • a check valve may be provided in the refrigerant piping of the refrigeration cycle in an air conditioner to prevent backflow of refrigerant or the like.
  • the check valve operates so that the valve body provided inside prevents the fluid from flowing back due to the back pressure of the fluid such as the passing refrigerant.
  • a valve body having a valve seat portion, a valve body slidably arranged inside the valve body and having a valve portion that closes the valve seat portion, and a valve opening operation of the valve body.
  • a check valve with a regulatory pin that regulates the limit is disclosed. In this check valve, when the valve body is opened, the valve body comes into line contact with the regulation pin, so that the valve opening operation limit of the valve body is restricted by the regulation pin, and the valve body is rotated by the engaging means. The stop is done.
  • the present disclosure has been made in view of the above-mentioned problems in the prior art, and it is possible to suppress the pressure loss when the fluid passes through and to secure the strength of the regulating means when the valve body is opened.
  • the purpose is to provide a check valve.
  • the check valve of the present disclosure includes a valve body formed in a cylindrical shape and a valve body provided in the valve body and moving in the axial direction of the valve body, and the valve body is formed in a cylindrical shape. It has an accommodating portion for accommodating the valve body, an inflow portion formed at one end and into which the fluid flows in, and an outflow portion formed at the other end and outflowing the fluid, and the accommodating portion is accommodated.
  • a guide member having a guide portion for guiding the valve body, a bent portion formed by bending the inflow side of the guide portion inward and functioning as a valve seat, and a cylinder on the outflow portion side of the guide member. It is formed in a shape and has a valve body stopper member that regulates the movement of the valve body to the outflow portion side.
  • the valve body stop member for restricting the movement of the valve body to the outflow portion side is formed in a cylindrical shape. As a result, it is possible to suppress the obstruction of the flow of the fluid passing through the check valve, and thus it is possible to suppress the pressure loss when the fluid passes through. Further, since the valve body comes into surface contact with the valve body stopper member when the valve body is opened, the strength of the regulating means when the valve body is opened can be ensured.
  • FIG. It is a perspective view which shows an example of the appearance of the check valve which concerns on Embodiment 1.
  • FIG. It is a schematic cross-sectional view which shows an example of the internal structure of the check valve of FIG.
  • FIG. 3 is an enlarged schematic view showing the periphery of the upper part of the guide member of FIG. 2.
  • FIG. 6 is an enlarged schematic view showing the periphery of the valve body stopper member of FIG.
  • FIG. is a schematic cross-sectional view which shows an example of the internal structure of a check valve when a guide member and a valve body stop member are integrally formed.
  • the check valve according to the first embodiment is arranged, for example, in the piping of an air conditioner, prevents the backflow of a fluid such as a refrigerant, and regulates the fluid to flow in only one direction.
  • the check valve has an internal valve body that opens when the fluid flows in from one end. Further, when the fluid flows in from the other end, the valve body closes.
  • FIG. 1 is a perspective view showing an example of the appearance of the check valve according to the first embodiment.
  • FIG. 2 is a schematic cross-sectional view showing an example of the internal structure of the check valve of FIG.
  • FIG. 2 shows an example of a cross section when cut in the xy plane passing through the central axis of the check valve 1 of FIG.
  • the check valve 1 includes a valve body 10 and a valve body 20.
  • valve body 10 The valve body 10 is formed, for example, in a cylindrical shape.
  • the valve body 10 is formed with an accommodating portion 11, an inflow portion 12, and an outflow portion 13. Further, a guide member 14 and a valve body stopper member 15 are formed inside the valve body 10. Normally, as shown by the solid arrow in FIG. 1, a fluid such as a refrigerant flows through the valve body 10 from the inflow portion 12 toward the outflow portion 13.
  • the accommodating portion 11 is formed in the central portion of the valve body 10, and accommodates the guide member 14, the valve body stopper member 15, and the valve body 20.
  • the inflow portion 12 is formed at one end of the valve body 10 and serves as an inlet for the fluid flowing into the check valve 1.
  • the outflow portion 13 is formed at the other end of the valve body 10 and serves as an outlet for the fluid passing through the check valve 1.
  • Piping is connected to the inflow part 12 and the outflow part 13 by welding or the like.
  • the piping is not limited to welding, and may be connected using, for example, screws or flanges. In this example, the case where the pipes are connected by welding will be described.
  • the inflow portion 12 and the outflow portion 13 are formed so that their inner diameters are different from each other. As described above, since the diameters of the pipes that can be connected to the inflow portion 12 and the outflow portion 13 are different, erroneous connection of the pipes to the valve body 10 is prevented. As a result, the check valve 1 can be correctly installed in the direction in which the flow of the fluid is desired to be blocked.
  • the valve body 10 is drawn so that the diameter gradually decreases from the accommodating portion 11 toward each of the inflow portion 12 and the outflow portion 13. By performing the drawing process, the guide member 14 and the valve body stop member 15 are positioned.
  • the inflow portion 12 side of the valve body 10 may be referred to as a “lower part”, and the outflow portion 13 side may be referred to as an “upper part”.
  • the guide member 14 provided inside the valve body 10 is formed in a cylindrical shape and guides the valve body 20 arranged inside.
  • the guide member 14 has a guide portion 14a and a bending portion 14b.
  • the guide portion 14a is arranged so as to be in contact with the accommodating portion 11 of the valve body 10.
  • a bent portion 14b is provided which is bent inward so as to protrude and is integrally formed with the guide portion 14a.
  • the bent portion 14b functions as a valve seat with respect to the valve body 20.
  • FIG. 3 is an enlarged schematic view showing the periphery of the lower part of the guide member of FIG. 2.
  • a mating portion 14c is formed in the upper portion of the bent portion 14b on the inner peripheral side (inside the dotted circle).
  • the mating portion 14c comes into contact with the valve body 20 when it moves toward the inflow portion 12.
  • the mating portion 14c is R-chamfered. This is to prevent damage to the valve body 20 when the valve body 20 comes into contact with the bent portion 14b due to the backflow of the fluid.
  • the lower portion of the bent portion 14b on the inner peripheral side is chamfered. This is to reduce the pressure loss that occurs when the fluid flows in from the inflow portion 12 and passes through the inner circumference of the bent portion 14b.
  • Arbitrary R chamfering is applied to the inner bent portion at the boundary portion between the guide portion 14a and the bent portion 14b. This is to relieve the stress applied when the valve body 20 moves in the axial direction (x direction) and when the fluid flows. Further, an arbitrary R chamfer is also applied to the outer bent portion at the boundary portion between the guide portion 14a and the bent portion 14b. This is to prevent the outer bent portion from damaging the inner surface of the drawn portion of the valve main body 10 when the valve main body 10 is drawn.
  • the thickness of the bent portion 14b in the flow direction (x direction) is, for example, the pressure of the fluid flowing inside the check valve 1 or the pressure applied when the valve body 20 comes into contact with the bent portion 14b due to the backflow fluid. It is preferable that the thickness is sufficient to withstand.
  • the inner peripheral surface of the guide portion 14a and the inner peripheral surface of the bent portion 14b have the same axial center.
  • the valve body 20 and the guide member 14 are formed so that the gap between the valve body 20 and the inner surface of the guide member 14 is reduced. As a result, the shake when the valve body 20 moves in the axial direction (x direction) is reduced, so that fluid leakage due to the shaft shake can be prevented. Further, the guide member 14 has a higher surface roughness on the inner surface and reduces frictional resistance with the valve body 20. As a result, the valve body 20 can be smoothly moved in the axial direction (x direction).
  • a concave groove is formed inward on the outer peripheral surface of the guide portion 14a of the guide member 14, and the seal member 16 is provided in the concave groove.
  • the seal member 16 blocks the fluid flowing between the outer peripheral surface of the guide member 14 and the inner peripheral surface of the accommodating portion 11.
  • the seal member 16 is made of a material such as rubber, resin, or metal that can block the flow of fluid flowing through the gap between the guide member 14 and the accommodating portion 11.
  • the seal member 16 is arranged, for example, at the central portion of the guide portion 14a in the axial direction (x direction).
  • brazing or the like is performed on both end faces of the valve body 10.
  • the seal member 16 is arranged in the central portion of the guide portion 14a, so that the seal member 16 becomes a valve. It is arranged at the position farthest from both end faces of the main body 10. Therefore, it is possible to prevent heat melting of the seal member 16 due to brazing or the like.
  • the thickness (thickness in the y direction) between the inner peripheral surface and the outer peripheral surface of the guide member 14 (guide portion 14a) is the axial direction (x direction) of the valve body 20 when a fluid flows during the product life period.
  • the thickness should be such that the thickness does not disappear even if it is moved to.
  • the guide member 14 is formed by using a material harder than the valve body 20. This is to prevent the guide member 14 from being damaged when the valve body 20 moves the guide member 14 in the axial direction (x direction).
  • FIG. 4 is an enlarged schematic view showing the periphery of the upper part of the guide member of FIG. 2.
  • the valve body stop member 15 is formed in a cylindrical shape and is provided so as to be located above the valve body 20 and the guide member 14.
  • the valve body stop member 15 functions as a stopper so that the valve body 20 does not move above the valve body stop member 15 when the valve body 20 opens and moves to the upper part. That is, the valve body stopping member 15 is provided as a regulating means for regulating the valve opening operation limit of the valve body 20.
  • the valve body stop member 15 is formed separately from the guide member 14. Thereby, in order to improve the pressure loss of the check valve 1, the check valve 1 can be designed without restricting the shape of each member, such as providing an additional structure for the valve body stop member 15. .. Further, by forming the valve body stop member 15 and the guide member 14 as separate bodies, the shape of each member can be simplified.
  • valve body stop member 15 and the guide member 14 are formed as separate bodies, it is possible to suppress various problems that occur when the check valve 1 is manufactured. For example, the valve body 10 is drawn, but even if the valve body stop member 15 is deformed at that time, the guide member 14 (particularly, the valve body) is separated from the guide member 14. Deformation of the place where 20 slides) can be prevented. Further, for example, when the valve body stop member 15 and the guide member 14 are integrated before being accommodated in the valve body 10, the guide member 14 (particularly, the portion where the valve body 20 slides) is deformed. there is a possibility. However, by separating the valve body stop member 15 and the guide member 14, it is possible to prevent such deformation of the member.
  • the valve body 10 is manufactured by drawing the guide member 14 and the valve body stop member 15 in a state of being housed. As a result, the integrated processing of the guide member 14 and the valve body stop member 15 is reduced, so that the process of creating the check valve 1 can be simplified.
  • the thickness of the valve body stop member 15 is, for example, the pressure of the fluid flowing inside the check valve 1 or the impact of the valve body 20 colliding with the valve body stop member 15 when the valve body 20 is opened by the flowing fluid.
  • the thickness should be sufficient to withstand the force.
  • the corners of the outer peripheral side upper part (outer peripheral outflow portion 13 side) of the valve body stopper member 15 are R chamfered.
  • the valve body stop member 15 is positioned by the drawing process applied to the upper part of the valve body 10, but the corners are chamfered so that when the drawing process is performed, the valve body stop member 15 is positioned. Damage to the valve body 10 due to contact of the corners with the inner surface of the valve body 10 is prevented.
  • valve body stopper member 15 By forming the valve body stopper member 15 in a cylindrical shape, the valve body 20 comes into surface contact with the valve body stopper member 15. In this case, since the impact force applied to the valve body stop member 15 is dispersed as compared with the case where the valve body 20 is in line contact, it is possible to suppress the occurrence of problems such as damage to the valve body stop member 15.
  • the inner diameter of the valve body stopper member 15 is preferably as large as possible. This is to prevent the flow of the fluid flowing through the check valve 1 from being obstructed. Further, for example, the valve body stopper member 15 may be R-chamfered at the corner portion on the inner peripheral side. This is to suppress a sudden change in flow when the fluid passes through the valve body stopper member 15.
  • valve body 10 described above has a wall thickness capable of withstanding a pressure of 5 times or more the design pressure of the fluid flowing in the pipe. This is to satisfy the strictest UL (Underwriters Laboratories) standard 5 times pressure failure test among various product safety standards (KHK standard and UL standard, etc.) in Japan and overseas for general check valves. To make it.
  • UL Underwriters Laboratories
  • the total length (x direction) of the valve body 10 is preferably 140 mm or more. As described above, when the check valve 1 is manufactured, brazing or the like is performed on both end faces of the valve body 10, but in this case, the influence of heat on the seal member 16 provided on the guide member 14 is prevented. It was found that a distance of 70 mm or more was required for brazing. Therefore, in order to prevent heat melting of the seal member 16 due to brazing to both end surfaces of the valve body 10, the total length of the valve body 10 needs to be 140 mm or more. By setting the total length (x direction) of the valve body 10 to 140 mm or more in this way, it is possible to prevent heat melting of the seal member 16 provided on the guide member 14.
  • valve body 20 The valve body 20 of FIG. 2 is arranged between the bent portion 14b of the guide member 14 provided in the accommodating portion 11 and the valve body stopping member 15, and the inside of the accommodating portion 11 is axially (x-direction) depending on the flow direction of the fluid. ).
  • the valve body 20 moves to the outflow side in the accommodating portion 11.
  • the fluid passes through the check valve 1.
  • the valve body 20 moves to the inflow side in the accommodating portion 11 and comes into contact with the bent portion 14b that functions as a valve seat. As a result, the fluid is shut off and the backflow in the check valve 1 is prevented.
  • FIG. 5 is a perspective view showing an example of the configuration of the valve body of FIG. As shown in FIG. 5, the valve body 20 includes a valve portion 21 and a guide portion 22.
  • the valve portion 21 comes into contact with the bent portion 14b of the guide member 14 that functions as the valve seat of the valve body 10 when the fluid flows back from the outflow portion 13 to the inflow portion 12. As a result, the flow path of the fluid formed by the bent portion 14b is blocked by the valve portion 21, so that the backflow of the fluid is prevented.
  • the guide unit 22 guides the valve body 20 when the valve body 20 moves the guide member 14 in the axial direction.
  • the outer diameter of the guide portion 22 is substantially equal to the inner diameter of the guide member 14 of the valve body 10.
  • the guide portion 22 has a plurality of blades protruding from the central axis in the outer peripheral direction at equal angular intervals. As a result, the fluid that flows in from the inflow portion 12 of the valve body 10 and passes through the flow path formed by the bent portion 14b passes between the plurality of blades and flows out from the outflow portion 13.
  • the guide portion 22 has four blades, but the guide portion 22 is not limited to this, and the guide portion 22 may be three or more in consideration of stability.
  • the blades of the guide portion 22 have a shape that rotates regularly when the fluid passes through. By forming the blades of the guide portion 22 into a rotating shape in this way, the blades of the guide portion 22 move in the axial direction (x direction) at a fixed place, and the blades of the guide portion 22 move to a specific location on the inner surface of the guide member 14. It is possible to prevent damage by rubbing only.
  • the valve body 20 has a mass that can be moved by the pressure of the fluid so that when the fluid flows from the inflow portion 12 to the outflow portion 13, it moves to the outflow portion 13. Further, the valve body 20 is formed of a resin or the like, and is formed by using a material softer than the guide member 14. This is to prevent the guide member 14 from being damaged when the valve body 20 moves the guide member 14 in the axial direction (x direction).
  • a hole 21a may be formed in the valve portion 21 of the valve body 20.
  • the hole portion 21a when the valve body 20 moves to the inflow portion 12 side and comes into contact with the bent portion 14b of the valve body 10, the flow path on the inflow portion 12 side and the flow path on the outflow portion 13 side communicate with each other.
  • the lower portion (inflow portion 12 side) of the valve main body 10 is completely closed, and it is possible to prevent the pipe from being damaged.
  • the diameter of the hole 21a is preferably about 0.4 mm or less. This is to prevent the backflow fluid from being blocked while preventing the piping from being damaged.
  • valve body 20 receives pressure from the outflow portion 13 side and moves to the inflow portion 12 side in the axial direction (x direction). Then, the valve portion 21 of the valve body 20 comes into contact with the bent portion 14b that functions as a valve seat provided on the inflow portion 12 side of the guide member 14. As a result, the fluid flowing in from the outflow portion 13 is blocked.
  • the check valve 1 is provided with a valve body stop member 15 formed in a cylindrical shape on the outflow portion 13 side of the guide member 14 provided in the accommodating portion 11. ..
  • a valve body stop member 15 formed in a cylindrical shape on the outflow portion 13 side of the guide member 14 provided in the accommodating portion 11. ..
  • the valve body stop member 15 is formed in a cylindrical shape, the valve body 20 comes into surface contact with the valve body stop member 15 at the time of valve opening, and the impact force at the time of contact is dispersed. It is possible to secure the strength of the valve body stopper member 15 when the valve 20 is opened.
  • a concave groove is provided on the outer periphery of the guide portion 14a, and a seal member 16 is provided in the concave groove.
  • the seal member 16 provided in the guide portion 14a is provided in the central portion of the check valve 1 in the axial direction. This makes it possible to prevent heat melting of the seal member 16 when the check valve 1 is manufactured by brazing or the like on both end faces of the check valve 1.
  • the inner circumference of the guide portion 14a and the inner circumference of the bent portion 14b of the guide member 14 have the same axial center.
  • the bent portion 14b of the guide member 14 is chamfered to the mating portion 14c formed on the outflow portion 13 side of the inner circumference. This makes it possible to prevent damage to the valve body 20 when the valve body 20 comes into contact with the bent portion 14b due to the backflow of the fluid.
  • the bent portion 14b is chamfered on the inner peripheral inflow portion 12 side. As a result, the pressure loss that occurs when the fluid flows in from the inflow portion 12 can be further reduced.
  • the boundary between the guide portion 14a and the bent portion 14b in the guide member 14 is chamfered.
  • the stress applied when the fluid flows can be relaxed, and it is possible to prevent the inner surface of the drawn portion of the valve main body 10 from being damaged when the valve main body 10 is drawn. can.
  • valve body stop member 15 is chamfered on the outflow portion 13 side of the outer circumference. This makes it possible to prevent damage to the valve body 10 due to contact of the corner portion of the valve body stopper member 15 with the inner surface of the valve body 10 when the valve body 10 is drawn.
  • valve body stop member 15 is formed separately from the guide member 14. This makes it possible to simplify the shapes of the guide member 14 and the valve body stop member 15. In addition, it is possible to suppress defects in manufacturing the check valve 1 and simplify the manufacturing process.
  • Embodiment 2 Next, the second embodiment will be described.
  • the second embodiment is different from the first embodiment in that the accommodating portion 11 of the valve body 10 is provided with a protrusion between the guide member 14 and the valve body stopper member 15.
  • the same reference numerals are given to the parts common to the first embodiment, and detailed description thereof will be omitted.
  • FIG. 6 is a schematic cross-sectional view showing an example of the internal structure of the check valve according to the second embodiment.
  • FIG. 6 shows an example of a cross section when cut in an xy plane passing through the central axis of the check valve 1 having the appearance shown in FIG. 1, as in the first embodiment.
  • the check valve 1 includes a valve body 10 and a valve body 20. Further, the valve body 10 is formed with an accommodating portion 11, an inflow portion 12, and an outflow portion 13 provided with a guide member 14 and a valve body stop member 15.
  • the accommodating portion 11 is formed with a protruding portion 17 projecting inward.
  • the protrusion 17 is provided between the guide member 14 and the valve body stopper member 15 and is provided for positioning both members.
  • the protruding portion 17 may be provided on the entire inner circumference of the accommodating portion 11, or may be provided on a part of the inner circumference. That is, the protrusion 17 may be provided in any way as long as the guide member 14 and the valve body stop member 15 can be positioned.
  • the guide member 14 and the valve body stop member 15 do not come into contact with each other. Therefore, positioning can be easily performed without bringing the guide member 14 and the valve body stop member 15 into contact with each other.
  • FIG. 7 is an enlarged schematic view showing the periphery of the valve body stopper member of FIG.
  • the corner portion (inside the dotted circle) of the surface (upper surface) on the outflow portion 13 side is R-chamfered. This is to prevent the protrusion 17 from being damaged when the guide member 14 comes into contact with the protrusion 17.
  • the corner portion (inside the one-dot chain line circle) on the surface (lower surface) on the inflow portion 12 side is also provided with R chamfer to prevent the protruding portion 17 from being damaged.
  • the accommodating portion 11 is provided with a protruding portion 17 projecting inward between the guide member 14 and the valve body stopper member 15. As a result, positioning can be easily performed without bringing the guide member 14 and the valve body stop member 15 into contact with each other.
  • FIG. 8 is a schematic cross-sectional view showing an example of the internal structure of the check valve when the guide member and the valve body stop member are integrally formed. As shown in FIG. 8, in the check valve 1 of this example, the valve body stop portion 14d is formed on the upper portion of the guide member 14 formed in the accommodating portion 11.
  • the valve body stop portion 14d is bent inward and integrally formed with the guide portion 14a.
  • the valve body stop portion 14d functions as the valve body stop member 15 in the first and second embodiments.
  • valve body 20 is included in the guide member 14. Then, when the fluid flows in from the inflow portion 12 of the valve body 10, the valve body 20 moves in the axial direction (x direction) from the inflow portion 12 side to the outflow portion 13 side and comes into contact with the valve body stop portion 14d. On the other hand, when the fluid flows in from the outflow portion 13 of the valve body 10, the valve body 20 moves in the axial direction (x direction) from the outflow portion 13 side to the inflow portion 12 side and comes into contact with the bent portion 14b.
  • the guide member 14 of the check valve 1 can be manufactured by, for example, pressing. Specifically, the bent portion 14b and the valve body stopping portion 14d bent inward are formed by press working at both ends in a state where the valve body 20 is housed in the tubular member forming the guide member 14. It is formed.
  • valve body 11 accommodating part, 12 inflow part, 13 outflow part, 14 guide member, 14a guide part, 14b bending part, 14c mating part, 14d valve body stop part, 15 valve body stop member, 16 Seal member, 17 protrusion, 20 valve body, 21 valve part, 22 guide part.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Check Valves (AREA)
PCT/JP2020/042603 2020-11-16 2020-11-16 逆止弁 WO2022102123A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2020/042603 WO2022102123A1 (ja) 2020-11-16 2020-11-16 逆止弁
JP2022561240A JP7361946B2 (ja) 2020-11-16 2020-11-16 逆止弁

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Application Number Priority Date Filing Date Title
PCT/JP2020/042603 WO2022102123A1 (ja) 2020-11-16 2020-11-16 逆止弁

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WO2022102123A1 true WO2022102123A1 (ja) 2022-05-19

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JP (1) JP7361946B2 (enrdf_load_stackoverflow)
WO (1) WO2022102123A1 (enrdf_load_stackoverflow)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001304442A (ja) * 2000-04-25 2001-10-31 Chiyoda Kucho Kiki Kk 逆止弁及び該逆止弁を用いた冷媒ブリッジ回路

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56134465U (enrdf_load_stackoverflow) * 1980-03-13 1981-10-12
US5918628A (en) * 1997-06-17 1999-07-06 Parker-Hannifin Corporation Multi-stage check valve
JP5774943B2 (ja) 2011-08-26 2015-09-09 株式会社不二工機 逆止弁装置
DE102011120628A1 (de) 2011-12-09 2013-06-13 Illinois Tool Works Inc. Rückschlagventil
WO2017064796A1 (ja) 2015-10-15 2017-04-20 三菱電機株式会社 逆止弁および冷凍サイクル装置
JP7305035B2 (ja) 2020-03-30 2023-07-07 三菱電機株式会社 逆止弁ユニットおよび空気調和装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001304442A (ja) * 2000-04-25 2001-10-31 Chiyoda Kucho Kiki Kk 逆止弁及び該逆止弁を用いた冷媒ブリッジ回路

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Fluid Mechanics, 10th edition ", 20 March 1986, JIKKYO SHUPPAN KK, JP, article TOYOKURA, TOMITARO ET AL.: "Passage; Fluid Mechanics", pages: 102 - 103, XP009537833 *

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JPWO2022102123A1 (enrdf_load_stackoverflow) 2022-05-19

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