EP2225502B1 - Expansionsventil - Google Patents

Expansionsventil Download PDF

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Publication number
EP2225502B1
EP2225502B1 EP08850589A EP08850589A EP2225502B1 EP 2225502 B1 EP2225502 B1 EP 2225502B1 EP 08850589 A EP08850589 A EP 08850589A EP 08850589 A EP08850589 A EP 08850589A EP 2225502 B1 EP2225502 B1 EP 2225502B1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
diaphragms
expansion valve
thermal expansion
individual
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP08850589A
Other languages
English (en)
French (fr)
Other versions
EP2225502A1 (de
Inventor
Anders Vestergaard
Jakob Spangberg
Benjamin Thomsen
Kirsten Bladt Nielsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss AS
Original Assignee
Danfoss AS
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 Danfoss AS filed Critical Danfoss AS
Publication of EP2225502A1 publication Critical patent/EP2225502A1/de
Application granted granted Critical
Publication of EP2225502B1 publication Critical patent/EP2225502B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
    • F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
    • F25B2341/06—Details of flow restrictors or expansion valves
    • F25B2341/068—Expansion valves combined with a sensor
    • F25B2341/0681—Expansion valves combined with a sensor the sensor is heated

Definitions

  • This invention relates to a thermal expansion valve for a refrigeration system comprising a working element with a diaphragm chamber.
  • the expansion valve has a closure member which is movable by the force of the working element.
  • a thermal expansion valve usually comprises a working element with a diaphragm clamped between a cover plate and a cover ring.
  • the space above the diaphragm is connected by the way of a capillary tube to a pressure sensor or a pressure-generating temperature sensor, the pressure of which loads the diaphragm from above.
  • the refrigerant pressure prevailing in the valve and a spring bearing against a plate acts on the diaphragm in the opposite direction.
  • US 5,005,370 is showing a thermostatic expansion valve with a diaphragm with different forces on either side of the diaphragm, on one side the force is from the pressure of refrigerant and on the other side the force is from the pressure of the vapour in the thermal bulb.
  • US 5,005,370 also shows a prior art thermal expansion valve with two diaphragms separated by a force transmitting member.
  • the diaphragm element is a single diaphragm made of a single layer of metal normally steel.
  • the single diaphragm is exposed to stress and deformation from the forces acting on the diaphragm.
  • the object of this invention is to make a diaphragm element for a thermal expansion valve for a refrigeration system that can stand up to the stress and deformation and improve the lifetime of the diaphragm element.
  • the problem is solved according to the invention by replacing the normal single diaphragm made of a single layer of metal with a multiple-diaphragm comprising two or more individual diaphragms.
  • a problem with the multiple-diaphragm is cold welding and wearing between the individual diaphragms.
  • This problem can be solved by adding an antifriction layer between the individual diaphragms.
  • the antifriction layer can be a small amount of grease or oil.
  • Another way to solve this problem is to coat the diaphragms by a layer of carbon, rubber, plastic or a layer of a metal like cobber or tin.
  • the multiple-diaphragm comprises two or more individual diaphragms, the individual diaphragms in a multiple-diaphragm are thinner than a traditional single diaphragm and therefore the multiple-diaphragm have higher flexibility and are less susceptible to damage due to stress and deformations and therefore the multiple-diaphragm has a longer life time.
  • This invention is a thermal expansion valve for a refrigeration system, having the features of claim 1, comprising a working element comprising a diaphragm chamber, a base ring and a cover plate wherein the diaphragm chamber comprises a multiple-diaphragm placed between the base ring and the cover plate, the multiple-diaphragm comprises two or more individual diaphragms.
  • the multiple-diaphragm is placed between the base ring and the cover plate, the multiple-diaphragm is made of two, three or more individual diaphragms.
  • the advantage is that the individual diaphragms are thinner than a traditional single diaphragm and therefore more flexible and less affected by stress, strains and deformations and therefore it has a longer life time.
  • the individual diaphragms support each other and therefore the diaphragms element has the same stiffness as a traditional single diaphragm.
  • Each individual diaphragm is a complete diaphragm and can be used as a single diaphragm. Therefore if one individual diaphragm is broken, for instance by loose metal particles left over from the manufacturing process penetrating the individual diaphragm, then the other individual diaphragms are still in place and the valve is still working.
  • the individual diaphragms are separated by an antifriction layer. This is because without an antifriction layer the individual steel diaphragms can glide against each other and the friction causes tear and cold welding destroying the individual diaphragms. To avoid this, a layer of antifriction material is placed between the individual diaphragms.
  • the antifriction layer can be grease or oil or another suitable fluid. This solves the problem avoiding friction between the individual diaphragms.
  • the antifriction layer can also be rubber or plastic. This could be a layer of double adhesive tape. This is easier in the assembly process to place a slice of rubber or tape between the individual diaphragms than to use grease or oil.
  • the diaphragms can be coated by a suitable material. This makes the assembly process even easier since no extra material is added during the assembly process.
  • the coating can be made of carbon, rubber or a plastic material. For instance diamond like carbon or Teflon can be used.
  • the coating can also be made of cobber, tin, zinc, silver, nickel or another suitable metal or alloy. Besides protecting against tear and cold welding coating also makes the diaphragm harder and less likely to be damaged in case there should be loose metal particles in the valve.
  • the multiple-diaphragm comprises two individual diaphragms. But according to this invention the multiple-diagram can also comprise three or more diaphragms.
  • the valve 1 shown in Fig. 1 is an expansion valve for a refrigeration system. It comprises a housing 2 with three nozzles, namely a nozzle 3 for the incoming liquid coolant, a nozzle 4 for the outgoing coolant, a nozzle 5 for connection to a sensor line and a spindle 6. One end of the housing 2 is closed by a working element 9; the working element comprises the base ring 10, the diaphragm chamber 11 and a cover plate 12. The diaphragm chamber is connected by way of a capillary tube 13 to a sensor 14.
  • Fig. 2 shows the working element 9 with the base ring 10, diaphragm chamber 11, a cover plate 12 with a connecting passage 13a for connecting the capillary tube (not shown), a plate 18, a bolt 19 and the multiple-diaphragm 15.
  • the multiple-diaphragm comprises two individual diaphragms.
  • the double diaphragm 15 is therefore pressurised from above by the pressure owing to evaporation of the fluid in the sensor 14 and is pressured from below by the pressure of the refrigerant, which is detected at the nozzle 5, and by a spring, not illustrated.
  • Fig. 3 shows an exploded view of the working element 9 with the base ring 10, a cover plate 12, a plate 18, a bolt 19 and the multiple-diaphragm comprising in this embodiment a first diaphragm 16 and a second diaphragm 17.
  • a diaphragm is typically made of stainless steel.
  • the individual diaphragms in the multiple-diaphragm typically are 0.08-0.20 mm thick.
  • the multiple-diaphragm with two 0.08 mm thick individual diaphragms has the same stiffness as a 0.1 mm thick single diaphragm.
  • two identical individual diaphragms is used.
  • two or more diaphragms that are slightly different and fit better together. This could be done by forming the individual diaphragms at the same time using the same tool, so the waves in the individual diaphragms fit exactly. This will reduce the forces acting between the individual diaphragms and reduce the risk of tear.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Diaphragms And Bellows (AREA)
  • Temperature-Responsive Valves (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Glass Compositions (AREA)

Claims (6)

  1. Ein thermisches Expansionsventil für ein Kühlsystem, das ein Arbeitselement mit einer Membranenkammer, einem Basisring und einer Abdeckplatte aufweist, dadurch gekennzeichnet, dass die Membranenkammer (11) eine Mehrfachmembrane (15) aufweist, die zwischen dem Basisring (10) und der Abdeckplatte (12) angeordnet ist, wobei die Mehrfachmembrane (15) zwei oder mehrere einzelne Membranen (16, 17) aufweist, die von einer Antireibungsschicht getrennt sind.
  2. Ein thermisches Expansionsventil nach Anspruch 1, dadurch gekennzeichnet, dass die Antireibungsschicht Fett oder Öl oder eine andere, geeignete Flüssigkeit ist.
  3. Ein thermisches Expansionsventil nach Anspruch 1, dadurch gekennzeichnet, dass die Antireibungsschicht Gummi oder Kunststoff ist.
  4. Ein thermisches Expansionsventil nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die einzelnen Membranen eine Beschichtung aufweisen.
  5. Ein thermisches Expansionsventil nach Anspruch 4, dadurch gekennzeichnet, dass die Beschichtung aus Kohlenstoff, Gummi, Teflon oder einem Kunststoffmaterial hergestellt ist.
  6. Ein thermisches Expansionsventil nach Anspruch 4, dadurch gekennzeichnet, dass die Beschichtung aus Kupfer, Zinn, Zink oder einem anderen geeigneten Metall oder einer Legierung hergestellt ist.
EP08850589A 2007-11-13 2008-11-12 Expansionsventil Active EP2225502B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200701606 2007-11-13
PCT/DK2008/000402 WO2009062511A1 (en) 2007-11-13 2008-11-12 Expansion valve

Publications (2)

Publication Number Publication Date
EP2225502A1 EP2225502A1 (de) 2010-09-08
EP2225502B1 true EP2225502B1 (de) 2011-05-25

Family

ID=40243928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08850589A Active EP2225502B1 (de) 2007-11-13 2008-11-12 Expansionsventil

Country Status (6)

Country Link
US (1) US20100320278A1 (de)
EP (1) EP2225502B1 (de)
CN (1) CN101855503A (de)
AT (1) ATE511067T1 (de)
BR (1) BRPI0820521B1 (de)
WO (1) WO2009062511A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101968118B (zh) * 2009-07-28 2014-07-30 丹佛斯（天津）有限公司 膨胀阀及其膜片支撑结构
CN103016830B (zh) * 2011-09-28 2015-12-16 杭州三花研究院有限公司 一种热力膨胀阀
JP2017156964A (ja) * 2016-03-01 2017-09-07 株式会社鷺宮製作所 容量調整弁

Family Cites Families (34)

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US2191925A (en) * 1935-04-30 1940-02-27 Gen Motors Corp Refrigerating apparatus
US2223298A (en) * 1936-09-19 1940-11-26 Fedders Mfg Co Inc Thermostatic expansion valve and valve control element
US2240374A (en) * 1938-08-08 1941-04-29 Honeywell Regulator Co Expansion valve
US2291898A (en) * 1939-05-05 1942-08-04 Honeywell Regulator Co Expansion valve
US2663502A (en) * 1950-01-24 1953-12-22 Detroit Controls Corp Refrigeration expansion valve and adjustment mechanism therefor
US2654559A (en) * 1950-03-08 1953-10-06 Imp Brass Mfg Co Diaphragm valve
US2725211A (en) * 1951-01-16 1955-11-29 Grinnell Corp Diaphragm valve
US3078066A (en) * 1957-09-20 1963-02-19 Richard P Moore Diaphragm valves
US3367130A (en) * 1966-02-23 1968-02-06 Sporlan Valve Co Expansion valve and refrigeration system responsive to subcooling temperature
US3982559A (en) * 1969-04-18 1976-09-28 Paul Ochs High temperature fluid pressure control valve
US4070004A (en) * 1976-03-01 1978-01-24 Waters Associates, Inc. Diaphragm valve
JPH0665945B2 (ja) * 1984-09-12 1994-08-24 日本電装株式会社 冷凍装置用膨脹弁
DE3512393A1 (de) * 1985-04-17 1986-10-09 KIM Production Ltd., Haifa Bay Membranventil
US5044170A (en) * 1988-03-10 1991-09-03 Fujikoki Mfg. Co., Ltd. Refrigeration system and a thermostatic expansion valve best suited for the same
US4968003A (en) * 1988-09-26 1990-11-06 Nupro Company Diaphragm valve
JPH02166367A (ja) 1988-12-19 1990-06-27 Fuji Koki Seisakusho:Kk 温度膨張弁
US5065595A (en) * 1990-12-05 1991-11-19 Sporlan Valve Company Thermostatic expansion valve
JP3006913B2 (ja) * 1991-05-09 2000-02-07 清原 まさ子 流体制御器
US5295662A (en) * 1991-08-26 1994-03-22 Masako Kiyohara Fluid flow-controller with improved diaphragm
US5335691A (en) * 1992-05-26 1994-08-09 Nupro Company High pressure diaphragm valve
IT1258586B (it) * 1992-06-01 1996-02-27 Macchina per la separazione di resudui solidi da reflui di conceria
WO1995005908A1 (de) * 1993-08-23 1995-03-02 Danfoss A/S Ventil, insbesondere expansionsventil für kälteanlagen, und verfahren zu seiner herstellung
DE4410346C2 (de) * 1994-03-25 1996-04-11 Danfoss As Ventil, insbesondere thermostatisches Expansionsventil
US6105379A (en) * 1994-08-25 2000-08-22 Altech Controls Corporation Self-adjusting valve
US6092550A (en) * 1997-02-03 2000-07-25 Swagelok Marketing Co. Diaphragm valve seat arrangement
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JP4484656B2 (ja) * 2004-10-01 2010-06-16 株式会社鷺宮製作所 感温制御弁および冷凍サイクル装置
EP1809959B1 (de) * 2004-10-21 2008-06-25 Danfoss A/S Ventil zur verwendung in einem kühlsystem
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US7243903B2 (en) * 2005-06-22 2007-07-17 Wincek Christopher P Valve diaphragm with a compression restraining ring, and valve including same

Also Published As

Publication number Publication date
EP2225502A1 (de) 2010-09-08
WO2009062511A1 (en) 2009-05-22
ATE511067T1 (de) 2011-06-15
BRPI0820521B1 (pt) 2019-10-08
BRPI0820521A2 (pt) 2015-06-16
CN101855503A (zh) 2010-10-06
US20100320278A1 (en) 2010-12-23

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