EP0135958A2 - Détecteur optique de dépôt de glace - Google Patents

Détecteur optique de dépôt de glace Download PDF

Info

Publication number
EP0135958A2
EP0135958A2 EP84201212A EP84201212A EP0135958A2 EP 0135958 A2 EP0135958 A2 EP 0135958A2 EP 84201212 A EP84201212 A EP 84201212A EP 84201212 A EP84201212 A EP 84201212A EP 0135958 A2 EP0135958 A2 EP 0135958A2
Authority
EP
European Patent Office
Prior art keywords
ice
deposition
formation surface
sensor
deposition 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.)
Granted
Application number
EP84201212A
Other languages
German (de)
English (en)
Other versions
EP0135958B1 (fr
EP0135958A3 (en
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 with 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 light transmitting and receiving means.
  • the ice-formation surface is formed by a part of a cooling means, whilst the connection of the device with the cooling means is possible but not necessary and the device, at least the housing thereof, consists of poorly heat-conducting material.
  • the ice-formation surface is determined by a part or a component of the cooling means to be mohitored, there is no freedom of choice of a suitable or optimal ice-formation surface.
  • a further disadvantage of the prescribed use of a part or a component of the cooling means as an ice-formation surface is that it may be subjected to deformation either due to the process of ice-deposition itself, for example, sagging resulting from increase in weight by the ice-deposition or due to manupulation of the cooling means, for example, in cleaning. Due to said deformation the quality of the detection is reduced.
  • the known device could be disposed so that onlv a relatively thick layer of ice is detected, whilst after every manipulation of deformation of the cooling member the disposition has to be checked. Moreover, this positioning brings about contamination of the light transmitting and receiving means.
  • the present invention has for its object to obviate one or more of the aforesaid or implied disadvantages and provides for this purpose a device of the kind set forth in the preamble, which is characterized in that at least that part of the ice-deposition sensor which comprises the connection with the cooling means is made from satisfactorily heat-conducting material and comprises the ice-deposition means made from satisfactorily heat-conducting material determining the ice-formation surface.
  • the present invention is based on the recognition of the fact that ice-d p position occurs in the first place on rims of heat-conducting members.
  • the shape of the ice-formation surface is determinative of the rate of ice-deoosition.
  • the ice-deposition means may be a set screw of satisfactorily heat-conducting material, the head face of which is disposed parallel to the optical path between the light transmitting and receiving means.
  • the head face of the set screw may be given a suitable shape or be provided with a suitably shaped extension, which determines the desired ice-formation surface, whilst the adiustment can b p simply quickly and accurately carried out.
  • the ice thickness to be detected can be previously set and by choosing other shapes of the ice-formation surface other adjustable ranges of ice thickness can be detected.
  • 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 p'ioto-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.
  • the ice-deposition means is not limited to the set screw shown, it may be otherwise constructed and be otherwise adjustable.
  • 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 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.

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)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
  • Measuring Fluid Pressure (AREA)
  • Air Bags (AREA)
  • Gyroscopes (AREA)
  • Glass Compositions (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Light Receiving Elements (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
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 true EP0135958A2 (fr) 1985-04-03
EP0135958A3 EP0135958A3 (en) 1986-02-05
EP0135958B1 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)

Citations (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

Patent Citations (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
DE3467032D1 (en) 1987-12-03
DK156095B (da) 1989-06-19
DK404484D0 (da) 1984-08-24
DK404484A (da) 1985-02-26
EP0135958B1 (fr) 1987-10-28
EP0135958A3 (en) 1986-02-05
NL8302970A (nl) 1985-03-18
ATE30468T1 (de) 1987-11-15

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