摘要:
PCT No. PCT/AU95/00345 Sec. 371 Date Dec. 18, 1996 Sec. 102(e) Date Dec. 18, 1996 PCT Filed Jun. 13, 1995 PCT Pub. No. WO95/35493 PCT Pub. Date Dec. 28, 1995A detector for detecting the presence of ice, water, mist, frost or other solids or liquids on a sensing surface is provided. The sensing surface is provided by a medium substantially transparent to electromagnetic radiation and solids or liquids are deposited on the surface. A transmitter directs radiation onto the surface and a receiver is responsive to radiation reflected from the surface. A discriminator circuit receivers an output from the receiver and provides an output indicative of whether a solid or a liquid is present on the surface.
摘要:
The device measures and monitors the extent of frost formed on the evaporator (4) and provides for its defrosting only when necessary. For this purpose there are provided flat resistive elements (A,B) applied to an electrically insulating flexible substrate (1). The resistive elements (A,B) are positioned spaced apart beside each other so as to form the plates of a capacitor. Contactors (6,7) are provided enabling the resistive elements (A,B) to be converted into the plates of a capacitor, which is powered by an oscillator.
摘要:
An electronic control for the operation of a beverage dispenser of the refrigerated ice bank type (50) is shown. The control provides for reliable determinations of when ice production is needed and when it is not needed. A microprocessor (140) receives information from an ice bank probe (70) and from a temperature probe (72) located within the ice bank (53). Data collected by the microprocessor (140) from both the ice bank probe (70) and the temperature probe (72) is used to determine if the ice bank is either insufficient in size and should be increased or is of sufficient size such that the compressor (61) can be turned off. A carbonator level probe (38) is also shown and connected to the microprocessor (140). The microprocessor is programmed whereby the carbonator probes are sampled in a manner to accurately determine the level of water in the carbonator (10) and therefore the need for turning on or turning off any water pump (59) connected thereto. Both the operation of the compressor (61) and the water pump (59) are controlled by the microprocessor (140) wherein the programming thereof provides for adequate hysteresis protection so that short cycling of the compressor and water pump is avoided.
摘要:
In an adaptive method and apparatus for detecting the formation of frost in a heat pump, the compressor cycle is interrupted and a defrosting operation is begun if the difference between the exterior ambient temperature and exterior heat exchanger temperature exceeds a difference function of the exterior ambient temperature. The length of this defrosting cycle is measured and the difference function is altered if the measured length deviates from a predetermined length of time. The frost formation difference function is initially set as a linear approximation Thereafter the difference function value at the particular exterior ambient temperature is increased if the length of the defrosting is greater than an upper limit value of six minutes and decreased if the length the defrosting is less than a lower limit value of four minutes.
摘要:
The accumulation of ice on a surface such as an evaporator fin (2) in a refrigerator unit is detected by a mechanical probe (4) which is moved by a bimetal bender element (8) upon periodic timer-controlled energisation of a bimetal heater (12) so as to pass over the surfaces of an evaporator fin (2). If the movement of the probe is obstructed by ice on the evaporator fin surfaces a switch (24) is operated by a bistable mechanism (16, 18, 19), causing energisation of a defrosting heater (25) and switching off the refrigerator compressor motor (C). If no ice is detected the probe (4) returns to its original reset position without operating the defrost control switch (24).
摘要:
Disclosure is a refrigerator that is configured such that during a cooling operation in which two evaporators are operated by one compressor, frost detecting operation is performed considering shortened operation cycles of two cooling fans, so that precise frosting detection is possible and power consumption due to the frosting detection is minimized, and consumption efficiency can be improved.