EP0135958B1 - Détecteur optique de dépôt de glace - Google Patents

Détecteur optique de dépôt de glace Download PDF

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Publication number
EP0135958B1
EP0135958B1 EP84201212A EP84201212A EP0135958B1 EP 0135958 B1 EP0135958 B1 EP 0135958B1 EP 84201212 A EP84201212 A EP 84201212A EP 84201212 A EP84201212 A EP 84201212A EP 0135958 B1 EP0135958 B1 EP 0135958B1
Authority
EP
European Patent Office
Prior art keywords
ice
deposition
formation surface
optical
sensor
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.)
Expired
Application number
EP84201212A
Other languages
German (de)
English (en)
Other versions
EP0135958A3 (en
EP0135958A2 (fr
Inventor
Gerrit R. Toes
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.)
Contronics Holland BV
Original Assignee
Contronics Holland BV
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 Contronics Holland BV filed Critical Contronics Holland BV
Priority to AT84201212T priority Critical patent/ATE30468T1/de
Publication of EP0135958A2 publication Critical patent/EP0135958A2/fr
Publication of EP0135958A3 publication Critical patent/EP0135958A3/en
Application granted granted Critical
Publication of EP0135958B1 publication Critical patent/EP0135958B1/fr
Expired legal-status Critical Current

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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
    • 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
    • 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

  • the invention relates to an optical ice-deposition sensor adapted to be connected to a cooling means and comprising light transmitting and receiving means for detecting ice-deposition on an ice-formation surface disposed in relationship to the optical path between the sight transmitting and receiving means, so that the optical path is interrupted when an ice layer formed on the ice-formation surface has reached a predetermined thickness, of which ice-deposition sensor at least that part comprising the connection to the cooling means is made from material having good heat conducting properties and comprises an ice-deposition means being made from material having good heat conducting properties and determining the ice-formation surface.
  • An optical ice-deposition sensor of the above nature is known from CA-A-1 089 949.
  • connection means for connecting the sensor to a cooling means. Therefore, in order to be able to choose a suitable or optimal ice-formation surface it is required to provide for a variety of connection means.
  • Objects of the invention are to provide an optical ice-deposition sensor having a simple construction, and therefore being easy to manufacture and rather inexpensive, and to provide such a simple optical ice-deposition sensor having the features of an ice-deposition means being adjustable with respect to the optical path of the light transmitting and receiving means and possibly having an ice-deposition enhancing ice-formation surface.
  • the invention provides for a sensor of the nature described in the preamble being characterized in that the ice-deposition means is a screw means, of which an end face is or carries the ice-formation surface, and which is adjustable with respect to the optical path.
  • the adjustable screw means is an adjustment screw made of material having good heat conducting properties, of which the end face is disposed parallel to the optical path between the light transmitting and receiving means. Therefore, in accordance with the invention the adjustment of the ice-formation surface can be simply, quickly and accurately carried out. During the manufacture the ice-thickness to be detected can be previously set.
  • the optical ice-deposition sensor is further characterized in that the end face of the screw means is provided with an extension comprising the ice-formation surface.
  • the ice-deposition means has the shape of a set screw 7 with a retainer nut 10 and of an ice-formation surface 9, which is formed in this case, as is shown in Fig. 2a, by an extension 8 provided at the head face of the set screw 7, which has a point-shaped ice-formation surface.
  • This point-shaped ice-formation surface furthers the ice deposition on the set screw.
  • the flat head surface extending parallel to the light path between the light transmitting and receiving means may, of course, be used.
  • Fig. 2b shows an extension 11 having a flat ice-formation surface.
  • the light transmitting and receiving means are accommodated in a housing of poorly heat-conducting material 3.
  • the housing 3 is the housing of a readily available opto-coupler comprising in co-operative relationship an infrared light emitting diode and a photo-diode or a photo-transistor.
  • At least that part of the housing or supporting structure 6 of the ice-deposition sensor embodying the present invention which comprises the connection 1, as well as the set screw 7 is made from satisfactorily heat-conducting material, for example, aluminium.
  • the housing 3 is made from poorly heat-conducting material.
  • the housing 3 accommodating the light transmitting and receiving means is made from poorly heat-conducting material, practically no heat is withdrawn therefrom.
  • the lead wires of the opto-coupler are connected in the housing part 4 with a cable 5, as the case may be, with the interposition of desired electronics, whilst the cable 5 is furthermore connected with the control-electronics for the device using the cooling means.
  • cooling means should be interpreted in a broad sense and is not limited to the cooling element described above; it may also be an evaporator.
  • shape of the ice-formation surface is not limited to the embodiments shown; it may be advantageously conical or spherical.
  • the invention is not limited to the use of extensions . on the screw means, for example, a screw with a retainer nut or the ice-formation means.
  • optical transmission is used, optical reflection may, as an alternative, be used again with visible or unvisible light. In principle other detectable forms of energy for example, radiation (X-ray, gamma rays) and sound (ultrasonic) may be used.
  • the transmitting and receiving means are then designed accordingly.

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  • 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)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Measuring Fluid Pressure (AREA)
  • Air Bags (AREA)
  • Glass Compositions (AREA)
  • Gyroscopes (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Light Receiving Elements (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Claims (2)

1. Un détecteur optique de dépôt de glace prévu pour être relié à un moyen de refroidissement et comprenant des moyens de refroidissement et de réception de lumière permettant de détecter un dépôt de glace sur une surface de formation de glace disposé par rapport au trajet optique entre les moyens de transmission- et de réception de lumière, de sorte que le trajet optique est interrompu lorsqu'une couche de glace formée sur la surface de formation de glace a atteint une épaisseur prédéterminée, détecteur de dépôt de glace dont au moins la partie comprenant liaison au moyen de refroidissement est réalisé à partir d'une matière présentant de bonnes propriétés de conductibilité de la chaleur et comprend un moyen de dépôt de glace réalisé à partir d'une matière présentant de bonnes propriétés de conductibilité de la chaleur et déterminant la surface de formation de glace, caractérisé en ce que le moyen de dépôt de glace est un moyen à vis dont une face d'extrémité est ou porte la surface de formation de glace et qui est réglable par rapport au trajet optique.
2. Un détecteur de dépôt de glace comme revendiqué à la revendication 1, caractérisé en ce que la face d'extrémité du moyen à vis présente un prolongement comprenant la surface de formation de glace.
EP84201212A 1983-08-25 1984-08-23 Détecteur optique de dépôt de glace Expired EP0135958B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84201212T ATE30468T1 (de) 1983-08-25 1984-08-23 Optischer eisbelaganzeiger.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8302970 1983-08-25
NL8302970A NL8302970A (nl) 1983-08-25 1983-08-25 Opnemer voor de detectie van ijsafzetting op koelelementen.

Publications (3)

Publication Number Publication Date
EP0135958A2 EP0135958A2 (fr) 1985-04-03
EP0135958A3 EP0135958A3 (en) 1986-02-05
EP0135958B1 true EP0135958B1 (fr) 1987-10-28

Family

ID=19842307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201212A Expired EP0135958B1 (fr) 1983-08-25 1984-08-23 Détecteur optique de dépôt de glace

Country Status (5)

Country Link
EP (1) EP0135958B1 (fr)
AT (1) ATE30468T1 (fr)
DE (1) DE3467032D1 (fr)
DK (1) DK156095B (fr)
NL (1) NL8302970A (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2297370A (en) * 1938-07-20 1942-09-29 Hoover Co Refrigeration
US3280577A (en) * 1963-11-20 1966-10-25 Matsushita Electric Ind Co Ltd Automatic defrosting control device
CA1089949A (fr) * 1978-03-17 1980-11-18 John H. Taylor Detecteur de givre

Also Published As

Publication number Publication date
EP0135958A3 (en) 1986-02-05
DK156095B (da) 1989-06-19
NL8302970A (nl) 1985-03-18
DE3467032D1 (en) 1987-12-03
DK404484D0 (da) 1984-08-24
ATE30468T1 (de) 1987-11-15
EP0135958A2 (fr) 1985-04-03
DK404484A (da) 1985-02-26

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