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
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
  • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
  • F25D17/067—Evaporator fan units
• • 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
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
  • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
• • 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
  • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
  • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
• • 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
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
  • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
  • F25D17/08—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation using ducts
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
  • H02P29/60—Controlling or determining the temperature of the motor or of the drive
• • 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
  • F25B2600/00—Control issues
  • F25B2600/11—Fan speed control
  • F25B2600/112—Fan speed control of evaporator fans
• • 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
  • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
  • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
  • F25D2317/066—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air supply
  • F25D2317/0666—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air supply from the freezer
• • 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
  • F25D2600/00—Control issues
  • F25D2600/02—Timing
• • 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
  • F25D2600/00—Control issues
  • F25D2600/06—Controlling according to a predetermined profile
• • 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
  • F25D2700/00—Means for sensing or measuring; Sensors therefor
  • F25D2700/12—Sensors measuring the inside temperature
  • F25D2700/122—Sensors measuring the inside temperature of freezer compartments

Definitions

• the present invention relates to a cooling device fan device according to the preamble of patent claim 1. Furthermore, the present invention relates to an ultra-low temperature refrigerator having such a fan device.
• ULT ultra-low temperature refrigerators
• fan devices for the heat dissipation of the process heat generated during the thermodynamic process at the heat exchanger (condenser) and, if necessary, for cooling the cooling unit compressors used.
• fan devices typically comprising at least one fan motor driving a fan rotor
• an air duct typically at or in a bottom portion of a refrigerator housing
• air entering through an air inlet via the condenser and compressors to an air outlet thus providing convenient cooling or operating conditions of the units required for cooling operation.
• Such as generic and generally known cooling units are usually used for industrial or research purposes, with a typical use of these devices is a long-term cooling: Suitable asdegut provided, biological or medical samples or the like. Contents are usually stored for several weeks or even months at this (ultra-low temperature) target temperature. for the purpose of complying with legal requirements.
• fan motor causes not only the (configured as an AC motor usually at a fixed speed operated,) itself potentially interfering noise, also generate the air zug since blades of the fan rotor, usually operated at speeds of about 1300 to 1400 rpm "1, for disturbing noises (so-called “fan tip noise”, ie caused by fan blades noise).
• the cooling circuit is subjected to the full fan power of the heat exchanger and the fan device, which in turn, reducing energy efficiency, results in increased compressor output because the refrigerator compressor (in such a reduced cooling power mode) is still flowing due to the high air flow not (anymore) running at an optimized working temperature or an optimized operating point.
• a structurally simple and the hardware Effort minimizing implementation to pay attention, and it is preferable to ensure that such an improved fan device in different operating environments, especially operating environments with different country-specific nominal grid voltages, can be operated easily and reliably.
• the fan motor is designed as a brushless, variable-speed DC motor.
• This allows in accordance with the invention particularly advantageously not only a controllability of the fan motor speed, according to the invention in dependence on an operating and / or Nutzkühl Kunststoffstemperatur, also allows such an embodiment of the fan motor, this in a particularly simple manner by a usually already for operating the ULT refrigerator operate self-employed motor or Vorschaltelektro- nik, which, usually additionally advantageously provided with voltage conversion means for processing various input-side supply network AC voltages, then provide a constant DC voltage from the output side such advantageous voltage converter, from which then generates an operating voltage for the DC motor according to the invention or can be derived and possibly regulated.
• the present invention advantageously achieves that a rotational speed of the fan motor (and thus also its electrical power consumption) can be adapted to the actual operating conditions of the (ULT) cooling unit units cooled thereby, whereby according to the invention the operating or useful cooling range temperature proves to be a particularly suitable control variable has (in this respect) to influence the speed of the fan motor.
• An advantageous consequence is that in the case of a compressor operation at a desired cooling temperature with no or only slight temperature fluctuations, insofar as a stationary operation and potentially associated with reduced compressor power, then the fan speed can be lowered, with the corresponding positive effects a fan noise and an electrical power consumption of the DC fan motor according to the invention.
• this can reduce the maximum speed from about 1300 minutes "1 to about 300 to 400 minutes "1 ;
• the invention ensures that during operating states of the refrigerator compressor, in which it is operated with high compressor power, a correspondingly increased fan speed of the fan motor is controlled, so that at any time optimal air delivery conditions exist.
• this temperature control is effected as a function of the operating or useful cooling temperature signal, which is generated according to further development by temperature sensor means which can be assigned to a useful cooling region of the cooling region of the cooling device.
• temperature sensor means which can be assigned to a useful cooling region of the cooling region of the cooling device.
• temperature signals can also be obtained indirectly from a motor or armature current of a refrigerator compressor motor, or other signals corresponding or proportional to an operating or useful cooling zone temperature can be used correspondingly.
• the operating or Nutzkühl Symposium may in particular also include a temperature gradient, that is, information about how or how much the temperature of the Nutzkühl Maschinens or thedeutzkompressors has changed in a time interval to extent a cooling operation when cooling down or a close stationary cooling operation.
• a temperature gradient that is, information about how or how much the temperature of the Nutzkühl Maschinens or thedeutzkompressors has changed in a time interval to extent a cooling operation when cooling down or a close stationary cooling operation.
• a temperature sensor as a temperature sensor, which is already assigned to the Nutzkühl Scheme anyway, such as with the purpose of using the thus generated temperature signal to control a cooling operation of the refrigerator compressor (self) or to regulate.
• a temperature sensor which is already assigned to the Nutzkühl Scheme anyway, such as with the purpose of using the thus generated temperature signal to control a cooling operation of the refrigerator compressor (self) or to regulate.
• PFC Power Factor Correction
• a particularly elegant development which is useful for sensitive operating environments consists in the delay means provided for further development, which again, preferably in connection with the integrated electronics, act on the cooling device compressor and are designed such that, in response to an activating or activating activation of the cooling device Operation start signal of the fan motor is activated before activation of the cooling device compressor, and according to the invention further developing a predetermined time interval before activating the cooling device compressor.
• Such a preferred development can, with a significant effect on the operational safety of a cooling device realized in this way, prevent a problem such that the cooling circuit operated by the cooling device compressor, in the presently preferred ultra-low temperatures often containing flammable refrigerant, has a leak, which then, In the case of a possible sparking caused by the compressor activation, this may cause a risk of explosion.
• the invention further developing solution of a fan motor activation by a predetermined time before switching on the cooling unit compressor then causes the cooling air flow any leaked refrigerant removed or at least diluted so that the remaining mixture is no longer flammable in the case of leakage and in that respect the risk of explosion is significantly reduced.
• a typical and further preferred time interval for such a delay of the compressor activation against activation of the fan motor is about 5 s, wherein configured time intervals according to the invention, depending on the configuration of a suitably equipped refrigerator and operating environments or conditions to provide an indication of the extent of this delay.
• a brushless DC voltage motor for the realization of the fan motor frequently offers the possibility that a speed-proportional signal is available for evaluation or operating state monitoring of the fan motor (be it via the control loop driving the DC motor, be it via a separate control circuit Return channel of a motor control electronics).
• a speed (lst-) signal of the fan motor according to the invention makes it possible to detect possible malfunctions and in response to influence on about the cooling or compressor operation of a suitably equipped cooling device to take: So, for example, in response to activating a fan motor according to the invention, by monitoring the associated speed signal, it can be determined whether this motor is operating at a given speed (for example by comparison with electronically stored setpoint values), and it can be concluded that the speed falls below a speed threshold (For example, a fan motor defect or a blockage in the air duct), whereupon issued an error message or even a start of the refrigerator compressor can be prevented.
• a speed threshold For example, a fan motor defect or a blockage in the air duct
• such a fan motor speed detection or monitoring makes it possible to set the fan motor speed in relation to the operating or useful cooling range temperature detected according to the invention and to output corresponding error signals again at a predetermined deviation from the provided target values or nominal value ranges or To prevent potential damage to the refrigerator, disable compressor operation.
• FIG. 1 shows a schematic block diagram of the cooling device fan device according to the invention in cooperation with a heat exchanger and cooling device compressor for realizing a first embodiment of the invention
• FIG. 2 shows a schematic view of a cooling device (designed for ultra low temperature), which on the bottom side forms an air duct which has the fan device according to FIG. 1 as well as the cooling device compressor.
• a fan motor 10 designed as a brushless DC motor with an air fan rotor 12 is thus relative to a heat exchanger dimensioned for ultra-low-temperature cooling purposes (Condenser) 15 is placed together with cooling unit compressor 14 of a cooling circuit not shown in detail, that a generated by the fan rotor 12, from a (suitable with a fan grille, a filter or the like in not shown in detail shown way covered) inlet 16 and brought to an outlet 18 directed cooling air flow from an ambient air environment of the cooling device 20 shown schematically in Fig. 2 can be acted upon.
• Condenser cooling unit compressor 14 of a cooling circuit not shown in detail
• this sketched air guide path is 16-10-12-15-14-18 formed in a bottom portion 22 of a refrigerator housing of the cooling device 20, which offers as Nutzkühl Scheme an interior space 24 for receiving refrigerated goods, which in the described embodiment in the ultra-low temperature range at target Temperatures from -80 ° C to -40 ° C can be maintained.
• a temperature sensor 26 is provided, which, shown schematically, a fan motor control unit 28 arranged upstream of the fan motor 10 as well as of a compressor drive unit 30 connected upstream of the compressor motor 14 can be used or used for operation control.
• the temperature signal output by the temperature sensor 26 (as an absolute temperature signal, additionally or alternatively also as a temperature gradient signal) by means of the compressor control unit 30 in order to provide a cooling capacity of the compressor corresponding to a current temperature in the useful cooling area 14 to regulate; this may advantageously be done by (at preferably constant compressor speeds) advantageously reducing a compressor operating voltage of the compressor motor nominally 230 VAC, such as when a steady-state operating condition is reached at or at a desired cooling temperature.
• 2 shows, in the form of an electronic module 40 provided in the bottom region 22, that the units 28 and 30 (FIG. 1) can also be brought together in a suitable manner.
• the temperature signal of the sensor 26 is used by the fan motor control unit 28, according to current temperature conditions, the operation of the fan motor 10, in particular its speed, temperature-dependent (or alternatively or additionally temperature gradient dependent) to regulate.
• a compressor operation (reduced in electrical power consumption) of the compressor 14 advantageously has the effect that only a reduced fan power, combined with a reduction in the fan speed, is required.
• the fan motor controller lowers the speed to a lower level, so that, due to the reduced air flow of the rotor 12, the compressor 14 and the heat exchanger (condenser) 15 are still maintained at an optimum operating point (working temperature).
• FIG. 1 illustrates that the output signal of the rotational speed detector 32, in comparison with suitable the fan motor control associated, stored Kenn- or setpoint values for a speed, can also make an effective error detection of the fan motor or the air duct: Should for example, a current speed detector signal 32 does not coincide with a (predetermined) drive signal or lead to an outside predetermined control action can be closed on a possible malfunction of the fan motor, alternatively to a clogging of the air inlet 16 associated filter, and via a control line 34th then the activation of the compressor motor by the control unit 30 are prevented.
• a current speed detector signal 32 does not coincide with a (predetermined) drive signal or lead to an outside predetermined control action can be closed on a possible malfunction of the fan motor, alternatively to a clogging of the air inlet 16 associated filter, and via a control line 34th then the activation of the compressor motor by the control unit 30 are prevented.
• control line 34 is also suitable to start the operation of the fan motor 10 (by the fan motor controller) in response to activation of the cooling device before the compressor 14 is activated;
• a delay unit would then be implemented to this extent which, by means of the control line 34, then triggers the delayed compressor activation. This may serve the purpose explained above to remove or dilute corresponding vapors by means of the fan air flow for the prevention of dangers due to escaped coolant, before a compressor activation takes place.
• FIG. 1 also shows a corresponding status or signal functionality in the form of the unit 36, and to adapt to a very wide range of (especially national) AC voltage network environments, networks have an input side Voltage conversion unit 38, which, supplemented by a (not shown in detail) power factor correction functionality (PFC), the AC line voltage of a wide input range between about 100 and about 240 VAC (with typical line frequencies between 50 and 60 Hz) in converts a DC voltage of 390 V, which then according to the invention further education to operate the fan motor control is used.
• PFC power factor correction functionality

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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)
• Power Engineering (AREA)
• Devices That Are Associated With Refrigeration Equipment (AREA)
• Control Of Positive-Displacement Air Blowers (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

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Publications (1)

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Family Applications (1)

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Citations (4)

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• 2017
  • 2017-01-27 DK DK17153488.6T patent/DK3355007T3/da active
  • 2017-01-27 EP EP17153488.6A patent/EP3355007B1/de active Active
  • 2017-12-19 WO PCT/EP2017/083604 patent/WO2018137858A1/de not_active Ceased
  • 2017-12-19 US US16/524,014 patent/US11346593B2/en active Active
  • 2017-12-19 JP JP2019536140A patent/JP2020507702A/ja active Pending
  • 2017-12-19 CN CN201780082637.1A patent/CN110168297B/zh active Active

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