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
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
  • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
  • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
• • 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
  • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
• • 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
  • F25D21/06—Removing frost

Definitions

• the present invention relates to a defrost device and a defrosting method.
• the air refrigerant refrigerator uses an air cycle that sucks in air from inside the warehouse, compresses it, and returns the cooled air to the inside of the warehouse through adiabatic expansion. Therefore, the moisture contained in the air turns into frost and accumulates inside the refrigerator and the warehouse, making it necessary to periodically defrost the inside of the refrigerator and the warehouse.
• the present invention was invented in order to solve the above problems, and an object of the present invention is to provide a defrost device and a defrosting method that can discharge frost that has formed on the defrost device as it is. .
• a defroster according to the present invention that achieves the above object includes: a suction port through which air with frost is sucked; a filter section to which the frost is attached and which separates the frost from the air; It has a first flow path through which the air from which the frost has been separated is sent into the ultra-low temperature freezer, and a discharge section through which the frost that has fallen from the filter section is discharged to the outside.
• the defrosting method according to the present invention that achieves the above object includes a suction step of sucking air with frost attached from a suction port, a separation step of making the frost adhere to a filter part and separating it from the air, and the above-mentioned steps.
• the method includes a step of sending the air from which the frost has been separated in the filter section into an ultra-low temperature freezer, and a discharging step of discharging the frost that has fallen from the filter section to the outside.
• fallen frost can be discharged outside as frost by the discharge section. Therefore, it is possible to suitably prevent frost from melting and plate-shaped ice forming on the filter portion, which would cause the defroster to become clogged and unable to defrost.
• FIG. 1 is a system diagram showing an ultra-low temperature refrigeration system including a defrost device according to an embodiment of the present invention. It is a figure showing a defrost concerning this embodiment, and is a figure showing a state where frost is attached to a filter part. It is a figure which shows the defrost device based on this embodiment, Comprising: It is a figure which shows how the frost adhering to a filter part fell by its own weight. 7 is a diagram showing a defrost device according to modification example 1. FIG. It is a figure showing a defrost concerning modification 2.
• FIGS. 1 to 3 Embodiments of the present invention will be described with reference to FIGS. 1 to 3.
• the same elements are given the same reference numerals, and redundant description will be omitted.
• Dimensional proportions in the drawings are exaggerated for illustrative purposes and may differ from actual proportions.
• FIG. 1 is a system diagram showing an ultra-low temperature refrigeration system 1 including a defrost device 40 according to an embodiment of the present invention.
• FIG. 2 is a diagram illustrating the defrost device 40 according to the present embodiment, and is a diagram illustrating how frost is attached to the filter section 42.
• FIG. 3 is a diagram illustrating the defrost device 40 according to the present embodiment, and is a diagram illustrating how frost attached to the filter section 42 falls under its own weight.
• the ultra-low temperature refrigeration system 1 is used, for example, to cool a drug warehouse.
• the object to be cooled is not limited to drug warehouses, but can also be used for cooling food warehouses and the like.
• the ultra-low temperature refrigeration system 1 includes an ultra-low temperature freezer 10 that cools and stores objects to be cooled, a circulation path 20 that is connected to the ultra-low temperature freezer 10 and through which air circulates, and the air inside the ultra-low temperature freezer 10 as a refrigerant. , has an air refrigerant refrigerator 30 that supplies cooled air into the ultra-low temperature freezer 10, and a defroster 40 that removes frost from the air supplied from the air refrigerant refrigerator 30 into the ultra-low temperature freezer 10.
• the ultra-low temperature freezer 10 chemicals are cooled and stored as described above.
• an automatic transport device is used to carry in and out the medicines unattended. If frost adheres to the automatic conveyance device, it may not function properly. Therefore, when using the air refrigerant refrigerator 30, the defrost device 40 removes the frost that adheres to the cooled air that returns to the ultra-low temperature freezer 10. must be removed.
• the internal temperature of the ultra-low temperature freezer 10 is not particularly limited, it is ⁇ 50° C. or lower. In this way, since the temperature inside the ultra-low temperature freezer 10 is ultra-low, it is possible to prevent the frost from melting in the defrost device 40, and it is possible to suitably discharge the frost as it is. Further, when the internal temperature of the ultra-low temperature freezer 10 is -50° C. or lower, a certain amount of frost adhering to the filter section 42 will fall, so by removing the frost, continuous operation is possible.
• frost When frost is formed in the air, the temperature of the air containing moisture decreases and moisture in excess of the saturated amount precipitates.
• the temperature inside the refrigerator is higher than the temperature inside the ultra-low temperature freezer 10 according to the present embodiment, such as between -20°C and -30°C, the time when the droplets exist as supercooled droplets is long, and the liquid droplets freeze. It is easy to form large crystals by agglomeration and bonding before crystallization.
• the internal temperature of the ultra-low temperature freezer 10 according to the present embodiment is between -60°C and -50°C, supercooling is easily released and the ice precipitates before the mass increases, so that the particle size can be reduced. Small frost forms.
• the absolute humidity is lower as the internal temperature of the ultra-low temperature freezer 10 is lower, the amount of moisture that precipitates decreases even with the same temperature difference, and a relatively small amount of frost is generated. Therefore, the frost adhering to the filter portion 42, which will be described later, becomes powdery and can be easily discharged from the defrost device 40 by wind pressure, as described later.
• the air refrigerant refrigerator 30 includes a compressor 31, an expander 32, and a primary cooler 33.
• the compressor 31 and the expander 32 are integrated and connected to the same motor M.
• the air refrigerant refrigerator 30 constitutes a reverse Brayton cycle.
• the air inside the ultra-low temperature freezer 10 (minus 60 degrees Celsius) that is sucked into the air refrigerant refrigerator 30 is compressed and heated in the compressor 31 to become high-temperature, high-pressure air at 90 degrees Celsius. Then, the air at 90°C is cooled down to 40°C in the primary cooler 33.
• the 40°C air is adiabatically expanded in the expander 32 and cooled to -80°C, and this air is sent into the ultra-low temperature freezer 10.
• the defrost device 40 is provided inside the ultra-low temperature freezer 10, as shown in FIG. 1, but the position where the defrost device 40 is placed is not limited. However, it is preferable to arrange it downstream of the expander 32 of the air refrigerant refrigerator 30.
• one defrost device 40 is provided.
• the defrost device 40 removes frost contained in the air when the air cooled to -80° C. is sent into the ultra-low temperature freezer 10 by the air refrigerant refrigerator 30.
• the configuration of the defrost device 40 will be described below.
• the defrost device 40 includes a housing 41, a filter section 42 provided in the housing 41, and a first flow path through which air from which frost has been separated flows into the ultra-low temperature freezer 10. 43, a first valve 44 provided in the first flow path 43, a second flow path 45 through which frost passes when frost is discharged from the housing 41, and a second valve provided in the second flow path 45. 46.
• the housing 41 is formed with a suction port 41A through which air containing frost cooled in the air refrigerant refrigerator 30 is sucked.
• the filter portion 42 is attached with frost contained in the air sucked in from the suction port 41A, and separates the frost from the air.
• the filter section 42 is arranged to extend in the horizontal direction, as shown in FIGS. 2 and 3. According to this configuration, since the filter portion 42 can be provided over a wide range, frost can be suitably attached to the filter portion 42.
• the filter section 42 is configured to include countless voids.
• the frost F adheres to the filter section 42, as shown in FIG.
• the air from which the frost has been separated passes through the filter section 42 and moves upward, and when the first valve 44 is open, it is sent into the ultra-low temperature freezer 10 via the first flow path 43 (Fig. (See arrow 2). That is, at this time, normal cooling operation is performed in the ultra-low temperature freezer 10.
• the defrost device 40 may further include a falling part that assists the frost adhering to the filter part 42 to fall due to its own weight.
• the falling part is not particularly limited, an ultrasonic vibrator or a blowing part that blows shot air can be used, but an ultrasonic vibrator is preferable from the viewpoint of preventing clogging in the filter part 42.
• the air flow may be reversed (downward in FIG. 2) to cause the frost adhering to the filter part 42 to fall.
• the frost F can be discharged from the second flow path 45. That is, the first valve 44 and the second valve 46 function as a discharge section that discharges frost to the outside as it is. That is, at this time, in the ultra-low temperature freezer 10, normal cooling operation is stopped and defrosting operation is performed.
• the second valve 46 is located within the ultra-low temperature freezer 10.
• the second valve 46 is placed outside the ultra-low temperature freezer 10, there is a possibility that frost will melt and freeze inside the second valve 46.
• the second valve 46 is placed inside the ultra-low temperature freezer 10, so that the above-mentioned freezing can be prevented.
• the frost discharged outside the defrost device 40 is received by a drain pan, for example, and is melted and drained using a heater installed in the drain pan or warm air, thereby preventing re-sublimation and removing the frost. It can be easily done.
• the defrost device 40 Since the defrost device 40 according to the present embodiment is placed in the ultra-low temperature freezer 10, it can defrost in a low-temperature atmosphere, and can preferably discharge frost formed in the defrost device 40 as it is. .
• a heater section may be attached to the filter section 42 of the defrost device 40. According to this configuration, even if frost adhering to the filter section 42 melts and plate-shaped ice forms on the filter section 42, the ice can be melted by the heater section, so that the defroster 40 can This prevents the defrosting from becoming impossible due to blockage.
• the defrosting method includes a suction process in which air with frost is sucked in from the suction port 41A of the housing 41, a separation process in which the frost is attached to the filter section 42 and separated from the air, and a step in which the frost is separated in the filter section 42.
• the method includes a step of sending the frozen air into the ultra-low temperature freezer 10, and a discharging step of discharging the frost that has fallen from the filter section 42 to the outside.
• frost is discharged from the second flow path 45 by the wind pressure of the air sucked in from the suction port 41A.
• the defrost device 40 includes the suction port 41A into which air with frost is sucked in, the filter section 42 to which frost is attached and which separates the frost from the air, and the filter section 42. It has a first flow path 43 through which the air from which the frost has been separated is sent into the ultra-low temperature freezer 10, and a discharge section through which the frost that has fallen from the filter section 42 is discharged to the outside. According to the defrost device 40 configured in this manner, the frost can be discharged outside as it is by the discharge section. Therefore, it is possible to suitably prevent frost from melting and plate-shaped ice forming on the filter portion 42, which would cause the defrost device 40 to become clogged and unable to defrost.
• the defrost device 40 also includes a second flow path 45 through which frost attached to the filter section 42 is discharged, a first valve 44 provided in the first flow path 43, and a second valve 44 provided in the second flow path 45.
• the discharge section further includes a valve 46, and the discharge section discharges frost using the wind pressure of the air sucked in from the suction port 41A with the first valve 44 closed and the second valve 46 opened. According to the defrost device 40 configured in this way, automatic defrosting is possible without an operator.
• the filter section 42 is arranged to extend in the horizontal direction. According to the defrost device 40 configured in this way, the filter section 42 can be provided over a wide range, so that frost can be suitably attached to the filter section 42.
• the defrost device 40 further includes a dropping part that drops frost attached to the filter part 42. According to the defrost device 40 configured in this manner, clogging in the filter section 42 can be effectively prevented.
• the defrost device 40 further includes a heater section attached to the filter section 42. According to the defrost device 40 configured in this way, even if frost adhering to the filter section 42 melts and plate-shaped ice forms on the filter section 42, the heater section cannot melt the ice. Therefore, it is possible to prevent the defrost device 40 from being blocked and unable to defrost.
• the filter section 42 was arranged to extend in the horizontal direction, as shown in FIGS. 2 and 3.
• the filter section 142 may be arranged to extend in the vertical direction. According to this configuration, frost can be efficiently attached to the filter portion 142 because it is arranged perpendicularly to the direction of travel of the air.
• the filter section 242 may be arranged so as to be inclined with respect to the horizontal direction and the vertical direction.
• one filter section 42 was provided.
• a plurality of filter sections 42 may be provided along the vertical direction.
• a part of the housing 41 is configured to be openable and closable, so that the filter part 42 to which frost F has adhered can be taken out, as shown in FIG. 6B. .
• one filter section 142 was provided.
• a plurality of filter sections 142 may be provided along the horizontal direction.
• a part of the housing 41 is configured to be openable and closable, so that the filter part 142 with frost F attached can be taken out, as shown in FIG. 7B. .
• the discharge section was configured by the first valve 44 and the second valve 46.
• the discharge section may be a conveyor or other conveyor placed on the bottom surface of the defrost device 40, and when a predetermined amount of frost accumulates on the conveyor, the conveyor discharges it out of the casing 41. It's okay.
• Ultra-low temperature refrigeration system 10 Ultra-low temperature freezer, 20 circulation path, 30 air refrigerant refrigerator, 31 Compressor, 32 Expander, 33 Primary cooler, 40 defrost, 41A Suction port, 42, 142, 242 filter section, 43 first flow path, 44 first valve, 45 second flow path, 46 Second valve.

Landscapes

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=90192315

Family Applications (1)

Country Status (5)

Citations (6)

• 2023
  • 2023-06-22 JP JP2024545451A patent/JPWO2024053206A1/ja active Pending
  • 2023-06-22 WO PCT/JP2023/023133 patent/WO2024053206A1/ja active Application Filing
  • 2023-06-22 KR KR1020257006339A patent/KR20250040726A/ko active Pending
  • 2023-06-22 EP EP23862751.7A patent/EP4585867A1/en active Pending
  • 2023-06-22 CN CN202380058993.5A patent/CN119678004A/zh active Pending

Patent Citations (6)

Also Published As

Similar Documents

Legal Events