EP2225502A1 - Expansion valve - Google Patents

Expansion valve

Info

Publication number
EP2225502A1
EP2225502A1 EP08850589A EP08850589A EP2225502A1 EP 2225502 A1 EP2225502 A1 EP 2225502A1 EP 08850589 A EP08850589 A EP 08850589A EP 08850589 A EP08850589 A EP 08850589A EP 2225502 A1 EP2225502 A1 EP 2225502A1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
expansion valve
diaphragms
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.)
Granted
Application number
EP08850589A
Other languages
German (de)
French (fr)
Other versions
EP2225502B1 (en
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/en
Application granted granted Critical
Publication of EP2225502B1 publication Critical patent/EP2225502B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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.
  • 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 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.
  • Fig. 1 shows a valve according to this invention.
  • Fig. 2 shows the working element according to this invention.
  • Fig. 3 shows an exploded view of the working element in Fig. 2.
  • 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)
  • Glass Compositions (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

A thermal expansion valve for a refrigeration system comprises a working element with a diaphragm clamped between a cover plate and a cover ring. The diaphragm is a multiple-diaphragm comprising two or more individual diaphragms. This makes the multiple-diaphragm more flexible than a single diaphragms and increases the lifetime of the diaphragm. The individual diaphragms are separated by an anti-friction layer to protect against tear, the anti-friction layer can be grease or oil placed between the individual diaphragms or it can be a layer of coating on the diaphragms.

Description

EXPANSION VALVE
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.
In commercially available thermal expansion valves 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 stress and deformation with time will wear out the diaphragm reducing the life time of the valve.
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 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.
Instead of placing a layer of grease, oil or some other material between the individual diaphragms, 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 invention is described in further detail hereinafter with reference to a preferred embodiment illustrated in the drawings, in which Fig. 1 shows a valve according to this invention.
Fig. 2 shows the working element according to this invention.
Fig. 3 shows an exploded view of the working element in Fig. 2.
In the embodiment described 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. In this embodiment 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.
In the above embodiment two identical individual diaphragms is used. However it is also possible to use 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.

Claims

1. A thermal expansion valve for a refrigeration system comprising a working element comprising a diaphragm chamber, a base ring and a cover plate characterized in that the diaphragm chamber (11) comprises a multiple-diaphragm (15) placed between the base ring
(10) and the cover plate (12), the multiple-diaphragm (15) comprises two or more individual diaphragms (16, 17).
2. A thermal expansion valve according to claim 1 characterized in that the individual diaphragms (16, 17) are separated by an antifriction layer.
3. A thermal expansion valve according to claim 2 characterized in that the antifriction layer is grease or oil or another suitable fluid.
4. A thermal expansion valve according to claim 2 characterized in that the antifriction layer is rubber or plastic.
5. A thermal expansion valve according to any of the claims 1 to 4 characterized in that the individual diaphragms comprises a coating.
6. A thermal expansion valve according to claim 5 characterized in that the coating is made of carbon, rubber, Teflon or a plastic material.
7. A thermal expansion valve according to claim 5 characterized in that the coating is made of cobber, tin, zinc or another suitable metal or alloy.
EP08850589A 2007-11-13 2008-11-12 Expansion valve Active EP2225502B1 (en)

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 true EP2225502A1 (en) 2010-09-08
EP2225502B1 EP2225502B1 (en) 2011-05-25

Family

ID=40243928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08850589A Active EP2225502B1 (en) 2007-11-13 2008-11-12 Expansion valve

Country Status (6)

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

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Publication number Priority date Publication date Assignee Title
CN101968118B (en) * 2009-07-28 2014-07-30 丹佛斯（天津）有限公司 Expansion valve and diaphragm support structure thereof
CN103016830B (en) * 2011-09-28 2015-12-16 杭州三花研究院有限公司 A kind of heating power expansion valve
JP2017156964A (en) * 2016-03-01 2017-09-07 株式会社鷺宮製作所 Capacity adjustment valve

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Also Published As

Publication number Publication date
ATE511067T1 (en) 2011-06-15
WO2009062511A1 (en) 2009-05-22
US20100320278A1 (en) 2010-12-23
CN101855503A (en) 2010-10-06
BRPI0820521B1 (en) 2019-10-08
BRPI0820521A2 (en) 2015-06-16
EP2225502B1 (en) 2011-05-25

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