WO1999047870A1 - Dispositif de degivrage destine particulierement aux systemes de refrigeration - Google Patents

Dispositif de degivrage destine particulierement aux systemes de refrigeration Download PDF

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Publication number
WO1999047870A1
WO1999047870A1 PCT/EP1999/001227 EP9901227W WO9947870A1 WO 1999047870 A1 WO1999047870 A1 WO 1999047870A1 EP 9901227 W EP9901227 W EP 9901227W WO 9947870 A1 WO9947870 A1 WO 9947870A1
Authority
WO
WIPO (PCT)
Prior art keywords
ellipsoid
frost
photodetector
defrosting
variation
Prior art date
Application number
PCT/EP1999/001227
Other languages
English (en)
Inventor
Maurizio Buratti
Antonio Fiorentini
Original Assignee
I.R.C.A. S.P.A. - Industria Resistenze Corazzate E Affini
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 I.R.C.A. S.P.A. - Industria Resistenze Corazzate E Affini filed Critical I.R.C.A. S.P.A. - Industria Resistenze Corazzate E Affini
Priority to CA002323868A priority Critical patent/CA2323868A1/fr
Priority to EP99910283A priority patent/EP1064507B1/fr
Priority to DE69902017T priority patent/DE69902017D1/de
Priority to AU29294/99A priority patent/AU2929499A/en
Priority to AT99910283T priority patent/ATE220194T1/de
Priority to US09/623,499 priority patent/US6321555B1/en
Publication of WO1999047870A1 publication Critical patent/WO1999047870A1/fr

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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D2600/00—Uses of garments specially adapted for specific purposes
    • A41D2600/10—Uses of garments specially adapted for specific purposes for sport activities
    • A41D2600/102—Motorcycling
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • F25B2700/111—Sensor to detect if defrost is necessary using an emitter and receiver, e.g. sensing by emitting light or other radiation and receiving reflection by a sensor

Definitions

  • This invention relates to a defrosting device, in particular for refrigeration systems.
  • the finned assembly is defrosted by the use of heating elements in contact with the assembly itself.
  • Said heating elements are in the form of electrical resistance elements, which are powered at predetermined time intervals for a constant period. If excessive heating occurs, a safety thermostat ensures that the items contained in the refrigeration unit remain preserved, by deactivating the heating elements.
  • This known defrosting system has the drawback of non-optimum defrosting of the finned because the powering of the heating elements is not correlated with the effective presence of frost. This can result in:
  • Figure 1 is a schematic view of a first embodiment of the device of the invention
  • Figure 2 shows it mounted on the finned assembly
  • Figure 3 shows a modification thereof.
  • the device of the invention consists of an ellipsoid portion 2, of eccentricity between 0.4 and 0.75, constructed of transparent polymer (for example polypentenes, PMMA, water-saturated transparent polyamides, etc.) having a refractive index to air of about 1.49.
  • transparent polymer for example polypentenes, PMMA, water-saturated transparent polyamides, etc.
  • a seat 4 housing a light emitting diode 6 (preferably a 940 nm IRED) positioned preferably in proximity to a focal point of the ellipsoid.
  • the diode seat 4 is closed by a plug 8 of black plastic.
  • Said ellipsoid portion is prolonged in the form of two concentric tubes 10,12, in one of which, namely in the inner tube 10, there is housed a photodetector 14 connected to a control unit for an electrical resistance element 16 mounted on a bracket 18 facing the finned assembly 17 of the refrigeration unit 19.
  • said photodetector is positioned substantially in correspondence with the other focal point of the ellipsoid.
  • a copper tube 20 having that end surface facing the ellipsoid substantially inclined to the tube axis so as to define with the ellipsoid an annular aperture 22 having two walls formed by portions of the tubes 10,12, one wall formed by the copper tube 20, and one wall 24 formed by the body of the ellipsoid itself.
  • That end of the copper tube external to the ellipsoid is rigid with the bracket 18, so as to achieve good thermal contact.
  • the device of the invention operates in the following manner: when frost is absent, because of the geometrical characteristics of the ellipsoid the light rays leaving the diode 6 strike a region of the ellipsoid surface 5 with an - 3 -
  • the resistance element 16 is not powered.
  • the refractive index of the ellipsoid to said microcystals covering it varies by virtue of the presence of these covering microcystals.
  • the refractive index decreases, with consequent increase in the limiting angle corresponding to the new refractive index, the rays radiated by the diode and which strike this region are no longer reflected, but instead are refracted with consequent isotropic light diffusion to the outside.
  • the activation of the resistance element 16 results both in the defrosting of the finned assembly 17 and, by virtue of the heat conducted through the bracket 18 and the annular tube 10, the defrosting of the outer surface of the ellipsoid body, which consequently returns to its initial state in which the photodetector 12 receives virtually all the rays transmitted by the diode.
  • the control unit consequently receives a signal substantially similar to the basic signal, to consequently deactivate the resistance element.
  • the device of the invention consists substantially of a truncated portion of ellipsoid 26, also of transparent polymer material but with its outer surface 5 metalized. Along the major axis of the portion there is provided a seat 28 housing a photodetector 30, and a light source 32 in the form of an LED positioned substantially in correspondence with the focal point of the ellipsoid.
  • a black mask 34 is interposed between the light source 32 and the photodetector 30 so that the rays emitted by this source cannot directly strike the photodetector.
  • a metal needle 38 with its burnished mirror-like tip positioned to correspond with the position which would have corresponded with the other focal point of the ellipsoid if this had not been truncated.
  • the other end of the needle is in thermal contact with the finned assembly 17.
  • the circular surface 38 and the end surface of the seat 28 are curved and shaped to form a micro-lens 42. - 5 -
  • This embodiment of the device of the invention operates in the following manner: under normal conditions the light rays r radiated by the LED 30 are reflected by the metallized surface of the ellipsoid and fed to the tip of the needle.
  • the photodetector receives no radiation and consequently feeds no signal to the control unit for activating the resistance element.
  • the burnished tip 39 generates to radiation towards the photodetector, even if it interferes with the beam.
  • the thermal connection between the metal needle 38 and the finned assembly 17 creates the same frost conditions on the tip 39 as on the finned assembly.
  • the increase in the frost thickness on the needle causes its frost crystals to interfere with the light bean radiated by the LED and reflected by the surface S of the ellipsoid, with the formation of an isotropic light source with conjugate image by the LED primary source, which via the micro-lens 42 is fed to the photodetector 30, which feeds a signal to the control unit causing it to activate the resistance element in order to defrost the finned assembly 17.
  • the defrosting of the finned assembly also causes defrosting of the needle tip.
  • the result is the restoration of normal conditions with no radiation received by the photodetector, which feeds a signal to the control unit to deactivate the resistance element.
  • the device presents numerous advantages, and in particular. - it provides rapid and effective defrosting of the finned assembly as the resistance element operates only if frost is present, - 6 -

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)

Abstract

La présente invention concerne un dispositif de dégivrage de l'ensemble de refroidissement à ailette (17) d'un système de réfrigération, caractérisé en ce qu'il contient: (a) un ellipsoïde (2, 26) en matière polymère transparente contenant une source lumineuse (6, 32) placée sensiblement en correspondances avec un des points focaux, et un détecteur (12, 30) de faisceaux lumineux émis par ladite source et réfléchis sur la surface interne de l'ellipsoïde, (b) plusieurs éléments de chauffage et de dégivrage (18) conçus pour l'ensemble de refroidissement (17), qui sont activés par un signal émis par un détecteur (12, 30) lorsqu'il détecte une variation de l'intensité lumineuse d'un faisceau, provoquée par la formation de gel le long du trajet du faisceau lumineux.
PCT/EP1999/001227 1998-03-19 1999-02-25 Dispositif de degivrage destine particulierement aux systemes de refrigeration WO1999047870A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002323868A CA2323868A1 (fr) 1998-03-19 1999-02-25 Dispositif de degivrage destine particulierement aux systemes de refrigeration
EP99910283A EP1064507B1 (fr) 1998-03-19 1999-02-25 Dispositif de degivrage destine particulierement aux systemes de refrigeration
DE69902017T DE69902017D1 (de) 1998-03-19 1999-02-25 Abtauvorrichtung, insbesondere für kühlanlagen
AU29294/99A AU2929499A (en) 1998-03-19 1999-02-25 Defrosting device, in particular for refrigeration systems
AT99910283T ATE220194T1 (de) 1998-03-19 1999-02-25 Abtauvorrichtung, insbesondere für kühlanlagen
US09/623,499 US6321555B1 (en) 1999-02-25 1999-02-25 Defrosting device, in particular for refrigeration systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVE98A000013 1998-03-19
IT1998VE000013A IT1306466B1 (it) 1998-03-19 1998-03-19 Dispositivo per effettuare lo sbrinamento, in particolare per impiantirefrigeranti.

Publications (1)

Publication Number Publication Date
WO1999047870A1 true WO1999047870A1 (fr) 1999-09-23

Family

ID=11424349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/001227 WO1999047870A1 (fr) 1998-03-19 1999-02-25 Dispositif de degivrage destine particulierement aux systemes de refrigeration

Country Status (8)

Country Link
EP (1) EP1064507B1 (fr)
AT (1) ATE220194T1 (fr)
AU (1) AU2929499A (fr)
CA (1) CA2323868A1 (fr)
DE (1) DE69902017D1 (fr)
IT (1) IT1306466B1 (fr)
TR (1) TR200002701T2 (fr)
WO (1) WO1999047870A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2456060A1 (de) * 1974-11-27 1976-06-10 Teichmann & Mevs Verfahren und vorrichtung zum automatischen abtauen von kaelteaggregaten
US4246489A (en) * 1979-04-16 1981-01-20 Tokyo Shibaura Electric Co., Ltd. Liquid level detector for detecting a liquid level when reaching a prescribed height
US4782331A (en) * 1986-06-10 1988-11-01 U.S. Philips Corporation Photoelectric icing detector
GB2212913A (en) * 1987-11-28 1989-08-02 Robin Edward Carmic Washington Ice warning detector
US4860551A (en) * 1987-12-29 1989-08-29 Whirlpool Corporation Frost sensor for an appliance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2456060A1 (de) * 1974-11-27 1976-06-10 Teichmann & Mevs Verfahren und vorrichtung zum automatischen abtauen von kaelteaggregaten
US4246489A (en) * 1979-04-16 1981-01-20 Tokyo Shibaura Electric Co., Ltd. Liquid level detector for detecting a liquid level when reaching a prescribed height
US4782331A (en) * 1986-06-10 1988-11-01 U.S. Philips Corporation Photoelectric icing detector
GB2212913A (en) * 1987-11-28 1989-08-02 Robin Edward Carmic Washington Ice warning detector
US4860551A (en) * 1987-12-29 1989-08-29 Whirlpool Corporation Frost sensor for an appliance

Also Published As

Publication number Publication date
EP1064507B1 (fr) 2002-07-03
DE69902017D1 (de) 2002-08-08
IT1306466B1 (it) 2001-06-11
CA2323868A1 (fr) 1999-09-23
ITVE980013A1 (it) 1999-09-19
AU2929499A (en) 1999-10-11
EP1064507A1 (fr) 2001-01-03
ATE220194T1 (de) 2002-07-15
TR200002701T2 (tr) 2000-12-21

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