WO2009113310A1 - 冷蔵庫 - Google Patents

冷蔵庫 Download PDF

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Publication number
WO2009113310A1
WO2009113310A1 PCT/JP2009/001111 JP2009001111W WO2009113310A1 WO 2009113310 A1 WO2009113310 A1 WO 2009113310A1 JP 2009001111 W JP2009001111 W JP 2009001111W WO 2009113310 A1 WO2009113310 A1 WO 2009113310A1
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WO
WIPO (PCT)
Prior art keywords
infrared
temperature
infrared sensor
condensing member
refrigerator
Prior art date
Application number
PCT/JP2009/001111
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
豆本壽章
柿田健一
森貴代志
田中正昭
足立正
堀尾好正
井下美桃子
Original Assignee
パナソニック株式会社
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
Priority claimed from JP2008202835A external-priority patent/JP2009243869A/ja
Priority claimed from JP2008231738A external-priority patent/JP5077160B2/ja
Application filed by パナソニック株式会社 filed Critical パナソニック株式会社
Priority to CN2009801090549A priority Critical patent/CN101970962B/zh
Priority to EP20090718578 priority patent/EP2267387A4/en
Publication of WO2009113310A1 publication Critical patent/WO2009113310A1/ja

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    • 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
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control devices
    • 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
    • F25D2700/16—Sensors measuring the temperature of products

Definitions

  • the present invention relates to a refrigerator using an infrared sensor.
  • the refrigerator has conventionally measured the air temperature in the refrigerator with a thermistor to detect the temperature in the refrigerator. For example, when hot food is put in, the amount of cooling is adjusted by measuring the temperature of the air in the cabinet heated by the influence of the hot food with a thermistor installed in the cabinet.
  • a thermistor installed in the cabinet.
  • an infrared sensor is provided in the cabinet to detect the actual food temperature and perform a cooling operation (see, for example, Patent Document 1).
  • FIG. 10 is a side longitudinal sectional view of a conventional refrigerator described in Patent Document 1.
  • FIG. 11 is a partially enlarged side sectional view of FIG.
  • the inside of the refrigerator main body 201 formed of a heat-insulated box is used as a storage space, with the refrigerator compartment 202 at the top, the vegetable compartment 203 at the bottom, and the freezer compartment 204 at the bottom. Yes.
  • a temperature switching chamber 205 and an ice making chamber are juxtaposed side by side through a heat insulating partition wall, and a dedicated door is provided at the front opening of each storage compartment. Is provided so as to be openable and closable.
  • a freezing cooler 206 such as a freezing room 204, a temperature switching room 205, an ice making room, and a cooling fan 207 for circulating cold air generated by the freezing cooler 206 into the storage room are arranged.
  • a refrigeration cooler 208 and a refrigeration fan (not shown) for cooling the refrigeration chamber 202 and the vegetable compartment 204 are provided in front of the refrigeration cooler 206.
  • the refrigerant is alternately or simultaneously supplied to the refrigeration cooler 206 and the refrigeration cooler 208 by driving the compressor 209 installed in the machine room below the main body and switching control of the refrigerant flow path switching valve.
  • the cooled cold air is blown to the storage compartments on the freezing temperature zone side and the refrigerating temperature zone side by the cooling blower fan 207 and the refrigerating fan, and each is controlled to be cooled to a predetermined temperature.
  • the low-temperature cold air discharged from the refrigeration cooler 206 is diverted to the freezing chamber 204, the ice making chamber, and the temperature switching chamber 205 by the cooling fan 207, and is blown and cooled through dedicated ducts.
  • the temperature switching chamber 205 is provided with an infrared sensor 212 attached to the recess 213 on the ceiling surface.
  • a shutter mechanism 214 is provided at the opening of the recess 213, and when the opening of the temperature switching chamber 205 is detected, the shutter mechanism 214 operates to close the opening of the recess 213. Further, when it is detected that the door of the temperature switching chamber 205 is closed, the shutter mechanism 214 is operated to open the opening of the recess 213, and cool air is blown into the room from the outlet 210.
  • the temperature of the food 211 cooled by the cold air is detected by the infrared sensor 212, and the operation of the refrigeration cycle and the opening and closing of the cold air damper installed in the vicinity of the air outlet 210 are controlled so as to reach a preset temperature.
  • the amount of cold air introduced into the room is adjusted, and the food 211 is controlled to have a predetermined set temperature.
  • the surface temperature of the target food 211 is detected by the infrared sensor 212, and only the necessary amount of cooling operation is performed when necessary to perform efficient cooling operation control.
  • the temperature switching chamber 205 needs to include a switch that detects opening and closing of the door and a shutter mechanism that interlocks with the switch, and has a complicated structure.
  • the moving part of the shutter mechanism malfunctions when, for example, some foreign matter, condensed water, frost, etc. are attached around the shutter mechanism. There is a case.
  • a thermistor has been used to detect the temperature of an ice tray provided in a freezer.
  • a thermistor located at the bottom of the ice tray, indirectly measuring the temperature of the water in the ice tray and adjusting the cooling amount of the freezer, It was judged whether the water in the ice tray was frozen.
  • the temperature of the water actually stored in the ice tray is not measured, so it is not known whether the water actually stored in the ice tray is frozen, and it is cooled until the ice making is completed. It was operated and cooled to the target temperature. Therefore, there is a problem that it takes time to complete ice making.
  • the infrared sensor detects the actual water temperature by detecting the thermal energy of the water stored in the ice tray as the amount of infrared radiation.
  • the cooling operation is performed (see, for example, Patent Document 2).
  • FIG. 12 is a side longitudinal sectional view of a conventional refrigerator described in Patent Document 2.
  • FIG. 13 is a partially enlarged side sectional view of a conventional refrigerator.
  • a freezer (not shown) is provided in a part of the refrigerator main body (not shown), and an ice making chamber 301 is provided in a part of the freezer.
  • a freezer door 302 for taking out food, ice, and the like, and a fan grill 303 is provided on the back of the ice making chamber 301. Cold air is blown out from the blowing portion 304 of the fan grill 303 into the ice making chamber. Water 306 in an ice tray 305 provided in 301 is cooled.
  • a heat insulating material 307 is disposed on the ceiling portion of the ice making chamber 301, and an infrared detector 308 is disposed in the heat insulating material 307 above the ice tray 305.
  • the infrared detector 308 detects the amount of radiation radiated from the water stored in the ice tray 305 through the light guide 311 of the cylindrical holder 310 that covers the infrared sensor 309 by the infrared sensor 309.
  • the infrared sensor 309 captures a change in thermal energy when the water 306 in the ice tray 305 is cooled to change to ice, determines completion of ice making, finishes the cooling operation of the freezer, and completes ice making. Display is in progress.
  • the infrared detector 308 is disposed in the ice making chamber 301 in the conventional configuration, for example, instantaneous discharge (ESD) due to static electricity charged on the human body, a towel for cleaning the ice making chamber 301, and the like.
  • ESD instantaneous discharge
  • the infrared sensor 309 or the element of the infrared sensor 309 itself is destroyed, so the detection function by the infrared sensor 309 does not work and malfunctions.
  • the present invention relates to a heat insulating box composed of a plurality of heat insulating compartments, a heat insulating partition that partitions the heat insulating box, a storage chamber partitioned by the partition, and infrared rays radiated from stored items stored in the storage chamber.
  • An infrared sensor having a temperature detection unit for detecting the amount, and an infrared condensing member provided closer to the storage chamber than the infrared sensor, so that at least the inner wall surface of the infrared condensing member has a larger heat holding force. It is the refrigerator formed in.
  • Refrigerator having such a configuration increases the heat retention of the inner wall surface of the infrared condensing member located in the visual field range of the infrared sensor in order to suppress temperature fluctuations in the visual field range of the infrared sensor.
  • it is possible to relax the temperature followability of the infrared condensing member with respect to temperature fluctuation due to disturbance, and to improve the temperature stability of the visual field range of the infrared sensor.
  • it is possible to suppress a decrease in detection accuracy due to disturbance effects (for example, opening and closing of doors and hot food) that change the ambient temperature of the temperature detection unit of the infrared sensor with a simpler configuration, and to improve the detection accuracy of the infrared sensor. it can.
  • FIG. 1 is a side cross-sectional view of the main part of the refrigerator according to Embodiment 1 of the present invention.
  • FIG. 2A is a side cross-sectional view of the infrared sensor mounting portion of the refrigerator.
  • FIG. 2B is an enlarged view of a main part of FIG. 2A.
  • FIG. 3 is a diagram showing a temperature comparison of the infrared condensing unit accompanying the opening of the refrigerator in the first embodiment of the present invention.
  • FIG. 4 is a side cross-sectional view of the main part of the refrigerator according to Embodiment 2 of the present invention.
  • FIG. 5A is a side cross-sectional view of the main part of the refrigerator according to Embodiment 3 of the present invention.
  • FIG. 5B is a plan view of the refrigerator as viewed from above.
  • FIG. 6 is a side sectional view of an essential part of the refrigerator in the fourth embodiment of the present invention.
  • FIG. 7 is a side cross-sectional view of the infrared sensor mounting portion of the refrigerator in the fourth embodiment of the present invention.
  • FIG. 8 is an enlarged view of a side cross section A portion of the infrared sensor mounting portion of the refrigerator according to Embodiment 4 of the present invention.
  • FIG. 9 is a plan view seen from the direction B directly above the infrared sensor mounting portion of the refrigerator according to Embodiment 4 of the present invention.
  • FIG. 10 is a side longitudinal sectional view of a conventional refrigerator. 11 is a partially enlarged side sectional view of FIG.
  • FIG. 12 is a side longitudinal sectional view of a conventional refrigerator.
  • FIG. 13 is a partially enlarged side sectional view of a conventional refrigerator.
  • the refrigerator of the present invention is radiated from a heat insulating box composed of a plurality of heat insulating compartments, a heat insulating partition that partitions the heat insulating box, a storage chamber partitioned by the partition, and storage items stored in the storage chamber.
  • An infrared sensor having a temperature detecting unit for detecting the amount of infrared rays, and an infrared condensing member provided closer to the storage chamber than the infrared sensor, and at least the inner wall surface of the infrared condensing member has a large heat retention force. It is formed to become.
  • Refrigerator having such a configuration increases the heat retention of the inner wall surface of the infrared condensing member located in the visual field range of the infrared sensor in order to suppress temperature fluctuations in the visual field range of the infrared sensor.
  • it is possible to relax the temperature followability of the infrared condensing member with respect to temperature fluctuation due to disturbance, and to improve the temperature stability of the visual field range of the infrared sensor.
  • it is possible to suppress a decrease in detection accuracy due to disturbance effects (for example, opening and closing of doors and hot food) that change the ambient temperature of the temperature detection unit of the infrared sensor with a simpler configuration, and to improve the detection accuracy of the infrared sensor. it can.
  • the refrigerator of the present invention includes an infrared mounting case that houses an outside line sensor, and includes a light collecting opening that penetrates in the same shape as the side surface of the infrared light collecting member in a part of the infrared light mounting case, and is formed in the heat insulating partition portion.
  • An infrared mounting case is embedded in the recessed portion.
  • the front end surface of the infrared condensing member of the refrigerator of the present invention is embedded in the same surface as the front end surface of the recess.
  • the infrared condensing member of the refrigerator of the present invention is made of a metal mainly composed of aluminum.
  • a metal mainly composed of aluminum having good heat conductivity.
  • the detection accuracy of an infrared sensor can be improved.
  • the infrared condensing member of the refrigerator of the present invention has an electrical insulating property obtained by blending resin and powder oxide and blending 85% or more of powder oxide. As a result, it is possible to ensure electrical insulation defined by various laws and regulations relating to home appliances without reducing the detection accuracy of the infrared sensor.
  • the through-hole provided in the infrared condensing member of the refrigerator of the present invention has a height of 3 mm or more from the front end surface of the infrared sensor. For this reason, for example, when the angle becomes wider, the temperature detection surface that detects the temperature with the infrared sensor also becomes larger, and there is a possibility that a temperature other than the installation surface is detected or food other than the food to be detected exists on the temperature detection surface. To increase. As a result, the height of the through-hole is set to 3 mm or more, the viewing angle is limited, and the temperature detection surface is narrowed, so that erroneous detection of the infrared sensor can be minimized, and the detection accuracy is stable. Further improvement can be achieved.
  • the refrigerator of the present invention includes a heat insulating box composed of a plurality of heat insulating compartments, a heat insulating partition that partitions the heat insulating box, a storage compartment partitioned by the heat insulating partition, and storage items stored in the storage compartment.
  • a plurality of protruding protrusions are provided around the protrusion opening.
  • a protrusion is formed on the surface of the infrared mounting case that houses the infrared sensor, and a slope portion formed in a shape having no right angle is provided outside the protrusion.
  • the front end surface of the infrared condensing member of the refrigerator of the present invention is substantially flush with the outer surface of the infrared mounting case on the storage chamber side.
  • the step between the infrared mounting case and the infrared light collecting member is eliminated, the inflow of warm air by opening and closing the door, the food and the like are stored, and the warm air pool of the steam from the food is eliminated.
  • the temperature fluctuation is small, so it is possible to suppress false detection due to a rise or fall due to a sudden change in ambient temperature, and to improve the stability of the detection accuracy of the infrared sensor. it can.
  • FIG. 1 is a side cross-sectional view of a main part of a refrigerator according to Embodiment 1 of the present invention
  • FIG. 2A is a side cross-sectional view of an infrared sensor mounting portion of the refrigerator
  • FIG. 2B is an enlarged view of a main part of FIG.
  • the freezer compartment 3 which is a part of the storage room of the refrigerator main body 2 comprised of the heat insulation box 1 is in the temperature zone by the upper upper heat insulation partition 4 and the lower lower heat insulation partition 5. It is partitioned from different refrigerator compartment 6 and vegetable compartment 7. Further, an opening (not shown) of the freezer compartment 3 is provided with a partition 8 that connects the left and right ends of the opening.
  • the freezer compartment 3 is divided into upper and lower compartments, and either compartment can be set to another temperature zone, for example.
  • the upper insulating partition 4 or the lower lower insulating partition 5 so as to divide the upper and lower compartments by the partition 8, it may be formed of an insulating partition over the entire cross section.
  • an evaporator 10 that generates cold air and a blower 11 that supplies and circulates the cold air to the refrigerator compartment 6, the freezer compartment 3, and the vegetable compartment 7 are arranged, respectively.
  • a defrosting heater 12 that is energized during defrosting is disposed in the lower space of the evaporator 10.
  • a cold air distribution chamber 19 is provided on the rear surface of the freezer compartment 3, and a cold air discharge port 21, a cold air discharge port 22, and a cold air discharge port 33 are provided as a plurality of cold air discharge ports continuously to the cold air distribution chamber 19. ing.
  • a door 23 and a door 24 are provided at the opening of the freezer compartment 3, and the freezer compartment 3 is closed so that there is no outflow of cold air from the freezer compartment 3.
  • Both the door 23 and the door 24 are drawer-type doors.
  • the door 23 and the door 24 are used by being pulled out toward the front side of the refrigerator, that is, the left side as shown in FIG.
  • frame bodies 25 and 26 are provided behind the door 23 and the door 24, respectively.
  • An upper container 27 and a lower container 28 are placed on the frames 25 and 26, respectively.
  • a cold storage material 29 is placed on the detection surface, which is the surface facing the infrared sensor 13 on the bottom surface of the upper container 27.
  • the regenerator material 29 has a melting temperature set to ⁇ 15 ° C., which is lower than the freezing temperature of foods that are generally frozen and higher than the temperature of the freezer compartment 3. Further, the filling amount of the regenerator material 29 is set to an amount that does not completely melt even when food is put on and placed on the regenerator material 29.
  • the inner wall surface of the upper heat insulating partition 4, which is the wall surface to which the infrared sensor 13 is attached is formed of ABS resin.
  • the other inner wall surface of the freezer compartment 3 is also made of ABS resin
  • the upper container 27 and the lower container 28 are made of PP resin made of a general resin similar in thermal characteristics to the ABS resin. .
  • a cold air inlet 30 for sucking cold air and guiding it to the evaporator 10 is provided at the lower back of the freezer compartment 3.
  • the food 31 is placed and stored on the cold storage material 29 by the user's hand.
  • the infrared sensor 13 generally detects the amount of infrared rays radiated from an object in the visual field range, converts the infrared light receiving unit 40 to convert it into an electric signal, and measures the reference temperature of the ambient temperature of the infrared light receiving unit 40 to obtain an electric signal. And a thermistor 42 for converting into the infrared element unit 43.
  • the purpose is to detect the temperature of the food 31, but the infrared sensor 13 detects the temperature of the food 31 and at the same time detects the temperature within the field of view of the infrared sensor 13.
  • the amount of infrared rays emitted from the wall surface of the chamber 4, the food 31 stored in the freezer compartment 4, the cold storage material 29, and the like is detected.
  • the ambient temperature of the infrared light receiving unit 40 is measured as a reference temperature.
  • a control board (not shown) for controlling the refrigerator is electrically connected to the wire 46 to which the infrared element portion 43 is electrically connected, the connector 44, and the printed circuit board (not shown) 41. ) Wiring 45 and the connector 44 are electrically connected.
  • the infrared element part 43 outputs the voltage of the reference temperature of the thermistor 42, and the voltage of the infrared rays amount of the infrared light-receiving part 40 to a control board (not shown), The temperature of the detected measured object is output.
  • the control device (not shown) makes a determination based on the calculated detected temperature.
  • the infrared condensing member 48 covers the periphery of the infrared element unit 43 in a state of being in thermal contact with the infrared element unit 43, is provided without any gap with the substrate 45, and is an infrared ray of disturbance radiated from other than the food 31 and the cold storage material 29.
  • a through hole 50 that restricts the viewing angle ⁇ ° is provided so as to be guided to the infrared light receiving unit 40.
  • a viewing angle Is set to be 30 ° to 60 °.
  • the viewing angle is preferably approximately 50 °.
  • the through-hole 50 has the highest infrared detection intensity at the center within the circle of the detection range, and the detection intensity becomes weaker toward the end. Therefore, by narrowing the viewing angle of the infrared sensor, it is possible to increase the intensity of the infrared ray of the detected object such as food 31 that is in the visual field range of the infrared sensor, and to detect the temperature of the object more reliably and accurately. it can. However, since a part of the viewing angle overlaps the inner wall surface 50a of the through-hole and the front end portion 50b of the through-hole, it is affected by the temperature of the inner wall surface 50a of the through-hole and the front end portion 50b of the through-hole, which causes erroneous detection.
  • At least the inner wall surface 50a of the through hole of the infrared condensing member 48 positioned within the visual field range of the infrared sensor has such disturbance even when there is a temperature fluctuation due to disturbance such as inflow of warm air accompanying opening and closing of the door. It is desirable to reduce the temperature followability with respect to and to enable stable detection.
  • the thermal conductivity is high and the heat holding power of the infrared light collecting member 48 itself is increased. It is devised to increase the heat capacity.
  • the heat retention force in the present invention represents the responsiveness of the temperature followability to the temperature variation when the ambient air is subjected to a thermal load such as a temperature variation, that is, the thermal load is applied.
  • a thermal load such as a temperature variation
  • the direction in which the temperature followability is poor is the direction in which the heat retention force is increased
  • the direction in which the followability is good is the direction in which the heat retention force is decreased.
  • This heat capacity can be expressed, for example, by the amount of heat radiation per unit surface area of the surface of the member exposed to the air.
  • the heat holding force increases, and even if the volume is the same.
  • the heat retention force increases.
  • the operation of the refrigeration cycle (not shown) is started, and the refrigerant flows through the evaporator 10 to generate cold air.
  • the generated cold air is sent to the cold air distribution chamber 19 by the blower 11, distributed from the cold air discharge port 21 and the cold air discharge port 22, and discharged into the freezer compartment 3.
  • the freezing chamber 3 is cooled to a predetermined temperature by the cold air discharged into the freezing chamber 3, and at the same time, the cold storage material 29 is also cooled.
  • the freezer compartment 3 is adjusted to a temperature at which food can be stored frozen for a certain period of time, for example, ⁇ 20 ° C., but the heat storage material 29 uses a material whose melting temperature is set to ⁇ 15 ° C.
  • the regenerator 29 is completely frozen, and the cool air that has cooled the inside of the cooling chamber 3 enters the cool air generation chamber 9 through the cool air inlet 30 and the evaporator 10. Cooled again.
  • the voltage output from the infrared sensor 13 is V
  • the ambient temperature measured by the thermistor 42 is S
  • the measurement range is
  • V ⁇ (B 4 ⁇ S 4 )
  • the infrared sensor 13 approaches the value of the output voltage V, and the reference temperature becomes the temperature S in the measurement range. If the temperature difference is large, the amount of infrared light detected by the infrared light receiving unit 40 increases, and the output voltage also increases.
  • the ambient temperature S of the infrared sensor 13 serving as the reference temperature also increases accordingly, the difference between the ambient temperature S and the average temperature B becomes small, and the warm food. Even when a food item is contained, it cannot be detected that a food having a relatively high temperature is introduced, and the detection accuracy of the infrared sensor 13 is lowered.
  • the infrared sensor 13 can detect an accurate temperature when warm food or the like enters.
  • the detection temperature of the infrared sensor 13 when the door 23 is closed is detected including the surface temperature of the regenerator 29 placed on the bottom surface of the upper container 27 which is a detection surface provided on the side facing the infrared sensor 13.
  • the surface detected by the infrared sensor 13 is formed of the cold storage material 29 having a cold storage function, so that the heat retention force on the detection surface can be increased. For example, even if there is a disturbance such as inflow of warm air, the detection surface of the infrared sensor has a high heat holding power, and the temperature followability to the disturbance can be relaxed. Therefore, higher detection accuracy can be obtained.
  • the detection surface on which the regenerator material 29 is disposed is less susceptible to disturbance due to poor thermal follow-up due to variations in ambient temperature than the surface of the upper container 27 where the regenerator material 29 is not disposed. Temperature followability can be relaxed. In other words, the detection surface on which the regenerator material 29 is disposed has a smaller heat radiation amount per unit area than the surface of the upper container 27 where the regenerator material 29 is not disposed. Can be increased.
  • the temperature detection of the infrared sensor 13 detects the temperature in the lower container 28.
  • the inside of the lower container 28, which is the detection surface facing the infrared sensor has a freezing temperature in the same temperature range as the bottom surface of the upper container 27, which is the original detection surface. Since it is a belt, the infrared sensor 13 detects the refrigeration temperature, so that high temperature detection is not performed and unnecessary quick refrigeration control can be prevented.
  • an infrared sensor is provided in a storage room having a drawer-type door in this way, if a door opening / closing sensor that detects opening / closing of the door is provided, false detection is performed by detecting the opening of the door and stopping detection of the infrared sensor.
  • the adjacent storage chamber on the projection line of the detection surface in the detection direction of the infrared sensor is preferably a storage chamber in the same temperature range or a low temperature range as the storage chamber provided with the infrared sensor. If this adjacent storage room is a storage room in a high temperature zone, a high temperature is detected, so that a control is applied to accelerate cooling by applying a load to the refrigeration cycle, and wasteful energy is saved. Consume.
  • the storage room adjacent to the storage room provided with the infrared sensor on the projection line of the detection surface in the detection direction of the infrared sensor is provided with the infrared sensor. It is desirable to make it a storage room in the same temperature zone as the storage room or a low temperature zone, thereby preventing false detection when the door is opened and improving the detection accuracy to steadily cool the refrigeration load with energy saving Can be realized.
  • the door 23 is in an open state, the warm air of the outside air flows in from the opening surface of the door 23, the warm air flows along the upper heat insulating partition plate 4 of the ceiling surface of the freezer compartment 3, and the through-hole of the infrared condensing member 48 Since the front end portion 50b and the front end surface 49a of the concave portion 49 are the same surface, even when the door is opened, the temperature fluctuation is small, so that erroneous detection due to a rise or fall due to a sudden change in ambient temperature is suppressed. And the stability of the detection accuracy of the infrared sensor 13 can be improved.
  • the temperature of the tip 50b of the through hole of the infrared condensing member 48 rises.
  • the heat holding power of the infrared condensing member 48 is large, the tip of the through hole of the infrared condensing member 48 even if warm air flows.
  • a temperature gradient is hardly applied from the portion 50b to the rear end portion 50c of the through-hole, and the entire temperature of the infrared condensing member 48 is maintained at a constant temperature.
  • the infrared sensor 13 will be in a state without a temperature difference with ambient temperature, and it is possible to improve the detection accuracy of the infrared sensor 13.
  • FIG. 3 which is a figure which shows the temperature comparison of the infrared condensing part accompanying the opening in the refrigerator of Embodiment 1 of this invention, and the material of the infrared condensing member 48 when the door is opened and closed
  • a comparison of the heat retention force, i.e., thermal followability, will be described.
  • the infrared condensing member 48 has a high thermal conductivity and a high heat capacity so that the heat retention is higher than that of the ABS resin, which has been conventionally used as a material for the inner wall surface of the warehouse.
  • a comparison was made between a material mainly composed of large aluminum, and a high thermal conductive resin material composed of a powder oxide having an electrically insulating property in addition to high thermal conductivity and heat capacity although the cost is slightly higher.
  • the powder metal resin material specifically, a high thermal conductive resin material in which alumina is a main component and is dispersed and mixed in a resin such as PPS, ABS, or LSP (liquid crystal polymer) is used.
  • the main component may be any one of silica, magnesia.
  • the experimental condition is that in a refrigerator installed at an external temperature of 38 ° C., the freezer compartment door maintained at ⁇ 17.5 ° C. is opened for 20 seconds (between 10 and 30 seconds on the horizontal axis) and then closed. The temperature with the passage of time of the detected temperature detected by the infrared sensor provided in the freezer compartment is measured.
  • the conventional ABS resin when the storage chamber kept at -17.5 ° C. is opened for 20 seconds, the temperature rises to -3 ° C. or higher and then gradually decreases. However, even after 70 seconds from the closing of the door, the temperature did not fall below -15 ° C, and the temperature did not return to the original temperature. Although not compared in this experiment, similar temperature characteristics are obtained with PP resin or the like, which is a conventional general resin, as well as such ABS resin.
  • the temperature temporarily rises to around ⁇ 7 ° C. when the door is opened, but then the temperature rapidly decreases, and the original temperature is 20 seconds after the door is closed.
  • the temperature dropped to -17.5 ° C., which is the temperature.
  • the heat holding power of aluminum is large, so the temperature of the inner wall surface of the light collecting member that is temporarily in contact with the warm air such as air in the surface storage chamber and outside air rises, but the aluminum light collecting member body Since the temperature of -17.5 ° C that was maintained before the door was opened was kept hot, after the door was closed, the temperature was quickly conducted to the inner wall surface of the light collecting member and stored before the door was opened. It seems that the detection temperature of the infrared sensor was rapidly reduced because the inner wall surface of the light collecting member was also lowered to the temperature of the light collecting member due to the cold heat.
  • the temperature temporarily rises to around -7 ° C when the door is opened, but then the temperature drops rapidly, and at the original temperature 20 seconds after the door is closed.
  • the temperature of the light collecting member is lowered to a certain ⁇ 17.5 ° C., and this also has a large heat holding power as described above, so that the inner wall surface of the light collecting member that is temporarily in contact with warm air such as air in the surface storage chamber and outside air
  • the temperature was kept on the surface of the light collecting member. It seems that the detection temperature of the infrared sensor quickly decreased because the inner wall surface of the light collecting member was also lowered to the temperature of the light collecting member due to the cold heat that was quickly conducted and stored before the door was opened.
  • the temperature does not rise so much even when the door is opened, and the temperature after opening for 20 seconds is ⁇ 15 ° C. And a rise of 2.5 ° C. Thereafter, 20 seconds after closing the door, the detection temperature of the infrared sensor rapidly decreased to the original -17.5 ° C.
  • the outer peripheral portion is surrounded by the heat retention promoting member, so that the surface area that radiates heat when warm air flows in is further reduced and the heat radiation is suppressed, so that only the inner wall surface of the light collecting member is warmed. It seems that the inner wall surface temperature does not rise immediately due to the heat retention force of the entire light collecting member even if it is in contact with the light collecting member, and after closing the door, the light collecting member body was kept before the door was opened like the above aluminum Since the temperature of -17.5 ° C. was kept hot, after the door was closed, the temperature was quickly conducted to the inner wall surface of the light collecting member, and the cold heat stored before the door was opened by the cold heat of the light collecting member. It seems that the inner wall surface also decreased to the temperature of the light collecting member.
  • the infrared condensing member 48 has thermal conductivity and heat retention as compared with the conventional ABS resin, which is a general material for the condensing member and the inner wall surface, in order to increase the heat retention force. It is formed of a material having high strength, for example, a metal such as aluminum, titanium, stainless steel, iron, copper, or a material containing them. In particular, from the viewpoint of being lightweight, having high thermal conductivity and high heat capacity, and being partly exposed in the freezer compartment 3, it is preferable to use aluminum having high corrosion resistance as a main component.
  • the infrared sensor 13 malfunctions due to friction caused by a cloth or the like that the user cleans the inside of the refrigerator or static electricity generated by the human body or the element itself.
  • it is a powder oxide resin that is electrically insulated and has high thermal conductivity and heat capacity.
  • any one of alumina, silica, and magnesia is the main component.
  • PPS, ABS, LSP (liquid crystal polymer), etc. can be used to improve the heat retention by using a material mixed and mixed.
  • high heat retention and high thermal conductivity and It also has electrical insulation, and the blending ratio is preferably 80% or more by weight of powder oxide.
  • the electrical insulation also has a specific resistance equivalent to that of a general resin member of 1.0 ⁇ 10 14. ⁇ ⁇ m or less There, it is possible to satisfy the electrical insulation properties are determined by various laws appliances.
  • the thermal conductivity is increased by setting the weight ratio of the powder oxide to approximately 85% or more, the thermal conductivity is 2 W / m ⁇ K or more, and the heat capacity per unit mass is 750 J / kg ⁇ ° C. or higher is desirable.
  • the inner wall surface of the infrared condensing member 48 has less followability to temperature fluctuations than the wall surface of the ABS resin, which is the inner wall surface of the upper heat insulating partition plate, which is the wall surface to which the infrared sensor is attached.
  • the heat retention is large.
  • the infrared mounting case 47 is used as a heat retention promoting member for further improving the heat retaining force of the infrared light collecting member 48, and the light collecting opening of the infrared mounting case 47 is surrounded by the infrared light collecting member 48.
  • the heat capacity is improved and the temperature fluctuation of the infrared condensing member 48 is further reduced.
  • the infrared mounting case 47 functions as a heat insulating member that surrounds the infrared condensing member 48 and prevents the outer surface of the infrared condensing member 48 from being exposed to the outside air, the infrared condensing member By reducing the contact area with 48 outside air and making the temperature change of the infrared condensing member at a constant temperature slow, followability to temperature fluctuations due to disturbance can be further relaxed, and heat retention is improved.
  • the infrared mounting case 47 functions as a heat retention promoting member that can improve the heat retention force.
  • the infrared condensing member 48 is covered with the infrared mounting case 47 as the heat retention promoting member, but this is formed of a member having a lower thermal conductivity than the infrared condensing member 48.
  • a member such as rubber or butyl may be fitted around the infrared condensing member 48 to serve as a heat retention promoting member. In this case, it can also function as a seal member when mounting with other components. Is possible.
  • it may be formed of an ABS resin generally used on the inner wall surface of a refrigerator, and an infrared condensing member may be fitted therein.
  • the structure that surrounds the periphery of the infrared condensing member 48 with a heat insulating member made of a material having low thermal conductivity makes it possible to further improve the heat holding power of the infrared condensing member 48, thereby further reducing the follow-up to temperature fluctuations.
  • an infrared sensor having stable detection accuracy can be provided.
  • the inner wall surface of the infrared condensing member which is the wall surface within the detection range of the infrared sensor, has a smaller amount of heat radiation per unit area than a general inner wall surface, that is, ABS resin. And an infrared sensor with stable detection accuracy can be provided.
  • the heat holding power of the food placement surface which is a detection surface that is a large area in the wall surface within the detection range of the infrared sensor
  • the general inner wall surface that is, ABS resin
  • the amount of heat radiation per unit area can be reduced, and an infrared sensor having stable detection accuracy can be provided.
  • the temperature followability to the temperature fluctuation caused by the inflow of warm air can be reduced, that is, the temperature fluctuation on the detection surface of the infrared sensor can be suppressed, and the infrared sensor having stable detection accuracy can be provided.
  • the infrared mounting case 47 is provided with a condensing opening 51 penetrating in the same shape as the side surface of the infrared condensing member 48 in a portion located substantially at the center, and the infrared condensing member 48 is provided in the condensing opening 51.
  • the infrared sensor 13 is mounted on the infrared mounting case 47 in the housed state. Further, the infrared light receiving unit 40 surface and the front end surface 48a of the infrared condensing member are parallel to each other, and the front end surface 48a of the infrared condensing member extending into the freezer compartment 3 and the outer surface of the infrared mounting case 47 are provided on the same surface.
  • the wind easily flows along the upper heat insulating partition plate 4 on the ceiling surface of the freezer compartment 3, so that the warm air can be accumulated in the through-hole of the infrared condensing member 48. It is provided so that a temperature gradient between the front end portion 50b and the rear end portion 50c of the through hole is difficult to be formed.
  • the inner wall surface 50a of the through-hole of the infrared condensing member 48 has a trapezoidal cross section with a conical top cut off, and the base has a diameter of 2.5 mm.
  • the detection surface side has a trapezoidal cross section with a diameter of 3.9 mm, a height of 4 mm, and a surface area of 40.73 mm 2 .
  • the infrared condensing member 48 is on the side of the upper heat insulating partition 4 opposite to the side on which the food 31 serving as the detection surface is placed, rather than the arrangement surface 40a of the infrared light receiving unit which is the infrared detection surface or the arrangement surface 42a of the thermistor.
  • a rear end surface 48b of the infrared condensing member is formed to extend to the inside of the infrared condensing member 48, and a space surrounded by the infrared condensing member 48 is sandwiched between the infrared light receiving unit 40 and the thermistor 42 inside. Is formed.
  • the infrared light receiving unit 40 and the thermistor 42 are arranged in the space on the center side of the infrared light collecting member 48, so that the heat holding power of the infrared light collecting member 48 can be increased. It is directly related to suppressing the temperature fluctuation of 42 itself.
  • the surface area has a sufficiently large heat capacity with respect to 40.73 mm 2 . It can be realized.
  • the volume of the infrared condensing member 48 is configured such that the back side of the arrangement surface 40a of the infrared light receiving unit is larger than the tip side of the arrangement surface 40a of the infrared light receiving unit. That is, the volume from the arrangement surface 40a of the infrared light receiving section to the rear end face 48b side of the infrared light collecting member is formed to be larger than the volume of the arrangement surface 40a of the infrared light receiving section to the front end face 48a of the infrared light collecting member.
  • the heat capacity on the rear end face 48b side of the infrared condensing member that is less susceptible to outside air can be increased, temperature fluctuations due to ambient air can be further reduced, and a highly heat-condensing member can be formed. It becomes possible to do.
  • At least the inner wall surface of the infrared condensing member 48 is formed so that the heat holding power per unit volume is larger than the wall surface of the storage chamber to which the infrared sensor is attached. is there.
  • the inner wall surface of the infrared condensing member located in the infrared sensor visual field range in order to suppress temperature fluctuations in the visual field range of the infrared sensor can alleviate temperature followability to temperature fluctuations caused by disturbance such as inflow of warm air.
  • the temperature stability of the infrared sensor's visual field range can be improved, and the detection accuracy can be reduced by the influence of disturbance (for example, door opening and closing and hot food) that changes the ambient temperature of the infrared sensor's temperature detector. It becomes possible to suppress the detection accuracy of the infrared sensor.
  • the inner wall surface temperature that is, the surface temperature in contact with air
  • the detection surface of the infrared sensor also has a high thermal holding power, and the temperature followability to the disturbance can be relaxed Therefore, it was found that a higher detection accuracy can be obtained because it is less affected by temperature fluctuation due to disturbance and can maintain a stable temperature.
  • the temperature of the tip of the infrared condensing member 48 is detected, and the temperature detected by the infrared sensor is the detection accuracy of the infrared sensor 13.
  • the temperature difference between the thermistor 42 and the inner wall surface of the infrared condensing member 48 and the tip end surface 48a of the infrared condensing member can be reduced, and the detection accuracy can be further improved. Infrared sensors can be used.
  • At least the inner wall surface of the infrared condensing member 48 has less followability to temperature fluctuation than the wall surface of the ABS resin, which is the inner wall surface of the upper heat insulating partition plate, which is the wall surface to which the infrared sensor is attached, that is, heat retention. Since the force is large, it is less susceptible to temperature fluctuations due to disturbance, and a stable temperature can be maintained, so that higher detection accuracy can be obtained.
  • the infrared condensing member 48 absorbs the influence of disturbance around the infrared sensor 13 (for example, door opening / closing and temperature fluctuation due to hot food).
  • the temperature of the infrared sensor 13 and the infrared condensing member 48 becomes uniform, the temperature fluctuation around the infrared sensor 13 is reduced, the thermal influence due to disturbance is reduced, and the temperature fluctuation is suppressed, thereby detecting the infrared sensor 13.
  • the accuracy can be improved.
  • the amount of infrared rays emitted from a load such as food is detected in the upper container 27 detected by the infrared sensor 13, and the temperature calculated from the amount of infrared rays is equal to or higher than a certain temperature (upper limit set temperature: T0).
  • the quick freezing control is automatically entered, and the quick freezing control is terminated when the temperature detected by the infrared sensor 128 after the setting of the quick freezing control is equal to or lower than a certain temperature (lower limit set temperature: T1). .
  • the refrigerator increases the rotation speed of the compressor (not shown) to thereby circulate the amount of refrigerant circulating. Raise the evaporator 10 temperature. Furthermore, the foodstuff 31 is cooled rapidly by increasing the cooling amount which circulates the cold air produced
  • the quick freezing control is automatically ended.
  • the maximum ice crystal formation zone which affects the freshness of food preservation, can be passed quickly by normal cooling operation, and after passing through the maximum ice crystal formation zone, even if it is normally cooled, it has little effect on the deterioration of freshness. There is no such thing as normal operation.
  • T0 which is the start temperature of rapid freezing control, that is, the upper limit temperature
  • T1 which is the end temperature of rapid freezing control, that is, the lower limit temperature
  • the quick freezing (quick freezing) control is automatically performed and the cooling capacity is automatically improved, so that the refrigerator can be cooled by a cooling operation as required.
  • the time cooling can shorten the operation time as the actual power consumption of the refrigerator, so that it is possible to provide a refrigerator that further saves energy.
  • the heat insulating box configured by a plurality of heat insulating compartments, the heat insulating partition that partitions the heat insulating box, the storage chamber partitioned by the partition, and the storage chamber are accommodated.
  • An infrared sensor having a temperature detection unit that detects the amount of infrared radiation emitted from the stored item, and an infrared condensing member that includes a through-hole 50 that surrounds the temperature detection unit and guides the radiation amount to the infrared sensor.
  • the infrared condensing member has a characteristic of high thermal conductivity compared to resin, and surrounds the infrared sensor with an infrared condensing member having high thermal conductivity, and the influence of disturbance around the infrared sensor ( For example, the infrared light collecting member absorbs temperature fluctuations caused by opening and closing of doors and hot food, etc., the temperature of the infrared sensor and infrared light collecting member becomes uniform, the temperature fluctuation around the infrared sensor is reduced, and the temperature around the infrared sensor is reduced. Warm By suppressing the fluctuation, it is possible to improve the detection accuracy of the infrared sensor.
  • a recess formed in the heat insulating partition an infrared mounting case that houses the infrared sensor, and a condensing opening that penetrates a part of the infrared mounting case in the same shape as the side surface of the infrared condensing member.
  • Infrared mounting case is embedded so that the side of the infrared condensing member is surrounded by a resin member with a larger heat capacity, thereby improving the heat capacity and further reducing the temperature fluctuation of the infrared condensing member. The accuracy can be further improved.
  • the front end surface of the infrared condensing member is embedded in the same surface as the front end surface of the recess, so that the inflow of warm air by opening and closing the door is allowed to pass only through the front end surface of the infrared condensing member, thereby eliminating the unevenness.
  • temperature fluctuations are small even when the door is opened by storing inflow of warm air by opening and closing the door, storing food, etc., and eliminating the accumulation of warm air from the food. It is possible to suppress erroneous detection due to the rise and fall caused by, and to improve the stability of detection accuracy.
  • the infrared condensing member is made of a metal mainly composed of aluminum with good heat conductivity, so that even if there is an inflow of warm air due to opening and closing of the door, it is a metal based on aluminum that has good heat conductivity.
  • the responsiveness by heat can be accelerated, the temperature gradient of the through hole 50 of the infrared condensing member can be eliminated, and the detection accuracy of the infrared sensor can be improved.
  • the infrared condensing member is characterized by electrical insulation, which is made by blending resin and powder oxide and blending 85% or more of powder oxide, thereby reducing the detection accuracy of the infrared sensor.
  • electrical insulation is made by blending resin and powder oxide and blending 85% or more of powder oxide, thereby reducing the detection accuracy of the infrared sensor.
  • the through hole 50 has a height of 3 mm or more from the tip surface of the infrared sensor, for example, when the angle is widened, the temperature detection surface where the temperature is detected by the infrared sensor is increased, and the temperature other than the installation surface is increased. There is an increased possibility that food other than the food to be detected or present on the temperature detection surface is detected.
  • the height of the through hole 50 is set to 3 mm or more, the viewing angle is limited, and the temperature detection surface is narrowed, so that erroneous detection of the infrared sensor can be minimized, and the detection accuracy is stable. Can be further improved.
  • the infrared sensor 112 detects the amount of infrared radiation emitted from an object, and the vapor from the hot food causes condensation around the recess 113 and around the infrared sensor 112, and the condensation (water) is generated. Because it detects the thermal energy it has as the amount of infrared radiation, it detects the temperature of the dew (water) adhering to the periphery of the infrared sensor 112 rather than detecting the surface temperature of the food, and accurately detects the surface temperature of the food.
  • the infrared sensor surface and the storage room space communicate with each other without providing an inclusion such as a cover or a condenser lens between the infrared sensor and food. It is possible to prevent a decrease in detection accuracy of the infrared sensor due to the condensation water adhering to the inclusions.
  • FIG. 4 is a side cross-sectional view of the main part of the refrigerator in the second embodiment of the present invention.
  • the infrared sensor 13 provided in the freezer compartment 3 which is one of the storage rooms in the refrigerator generally detects the amount of infrared rays radiated from an object in the visual field range and converts it into an electrical signal.
  • a thermistor 42 that incorporates a thermistor 42 that measures a reference temperature of the ambient temperature of the infrared light receiver 40 and converts it into an electrical signal. Therefore, when food with a high temperature is put out of the visual field range of the infrared sensor 13, it cannot be detected.
  • the first infrared sensor 13a provided on the front side and the second infrared sensor 13b provided on the rear side are provided. It has multiple infrared sensors.
  • a plurality of cold air discharge ports 21 for cooling the inside of the upper container 27 are provided, a first cold air discharge port 21a that mainly discharges cold air to the front side, and a second cold air discharge port that mainly discharges cold air to the rear side. 21b.
  • the temperature on the front side of the upper container 27 in the upper container 27 in the freezer compartment 3 can be detected by the first infrared sensor 13a, and the temperature on the rear side of the upper container 27 can be detected by the infrared sensor 13b. Therefore, the detected temperatures of the plurality of infrared sensors are compared by the control device, and it is determined in which region a load requiring cooling is applied.
  • positioned is cooled intensively. In order to perform efficient cooling, it is possible to change the air volume of the plurality of discharge ports.
  • the infrared sensor that has detected the highest temperature among the infrared sensors 13 is the first infrared sensor 13a, it is determined that a warm object has been introduced to the front side, and the second cold air
  • the discharge port 21b is closed by a damper, and the food put into the area on the front side of the upper container 27 can be rapidly cooled by discharging cold air intensively from the first cold air discharge port 21a.
  • the bottom surface of the upper container 27, which is a detection surface provided on the side facing the infrared sensor 13, is formed of a member having a large heat holding force.
  • the infrared condensing member that narrows the detection range of the infrared sensor has a large heat holding force, so that efficient rapid cooling with higher detection accuracy can be performed. Can do.
  • FIG. 5A is a side cross-sectional view of the main part of the refrigerator according to Embodiment 3 of the present invention.
  • FIG. 5B is a plan view seen from above the freezer compartment of the refrigerator according to Embodiment 3 of the present invention.
  • the infrared sensor 13 provided in the freezer compartment 3 which is one of the storage rooms in the refrigerator generally detects the amount of infrared rays radiated from an object in the visual field range and converts it into an electrical signal.
  • a thermistor 42 that incorporates a thermistor 42 that measures a reference temperature of the ambient temperature of the infrared light receiver 40 and converts it into an electrical signal. Therefore, when food with a high temperature is put out of the visual field range of the infrared sensor 13, it cannot be detected.
  • the infrared sensor 13c that can swing the infrared sensor 13, that is, the detection range can be changed by a movable mechanism is used.
  • This infrared sensor 13c receives at least infrared rays with respect to the width 27w of the upper container 27 around the center line 27a in the longitudinal direction of the bottom surface of the upper container 27 which is a detection surface detected by the infrared sensor 13c of the storage room, that is, the food placement surface. The entire infrared sensor 13c is moved so that the unit 40 is movable.
  • the dimension 27x in the width direction of the visual field range of the infrared sensor 13c with respect to the width dimension 27w of the upper container 27 is as follows.
  • positioned is cooled intensively. In order to perform efficient cooling, it is possible to change the air volume of the plurality of discharge ports.
  • the portion where the highest temperature is detected in the visual field range of the infrared sensor 13c is on the front side (that is, on the door 23 side)
  • it is determined that a warm object has been put on the front side
  • the second cold air discharge port 21b is closed by a damper, and the cold food is intensively discharged from the first cold air discharge port 21a, thereby rapidly cooling the food put into the area on the front side of the upper container 27. Is possible.
  • rapid cooling is performed by providing a plurality of discharge ports and concentrating cool air in a heavily loaded area.
  • the wind direction can be changed even with a single discharge port. It is also possible to adjust the direction of the wind so that the cool air flows in a region with a large load with a variable device. In this case, it is not necessary to provide a plurality of discharge ports 21. It becomes possible to cool intensively.
  • the entire infrared sensor 13c is moved in order to make the detection surface detected by the infrared sensor 13c in the storage room wider, but this purpose is to move the infrared detection surface. Therefore, for example, in the case where some light collecting member such as a cover is formed on the surface, only the opening of the light collecting member may be movable. By providing a configuration that allows only the aperture of the light collecting member to move without being moved, the burden on the electric wiring and the movable portion is reduced even in a low-temperature environment, and the infrared sensor 13c having a more reliable movable portion is provided. Can be provided.
  • FIG. 6 is a side cross-sectional view of the main part of the refrigerator according to Embodiment 4 of the present invention.
  • FIG. 7 is a side cross-sectional view of the infrared sensor mounting portion of the refrigerator in the fourth embodiment of the present invention.
  • FIG. 8 is an enlarged view of a side cross-section A portion of the infrared sensor mounting portion of the refrigerator in the fourth embodiment of the present invention.
  • FIG. 9 is a plan view seen from the direction B directly above the infrared sensor mounting portion of the refrigerator according to Embodiment 4 of the present invention.
  • the freezer compartment 3 which is a part of the storage room of the refrigerator main body 102 constituted by the heat insulating box 101, has a temperature zone due to the upper upper heat insulating partition 104 and the lower lower heat insulating partition 105. It is partitioned from different refrigerator compartment 106 and vegetable compartment 107. Further, an opening (not shown) of the freezer compartment 103 is provided with a partition 108 that connects the left and right ends of the opening.
  • an evaporator 110 that generates cold air and a blower 111 that supplies and circulates cold air to the refrigerator compartment 106, the freezer compartment 103, and the vegetable compartment 107 are arranged, respectively.
  • a defrosting heater 112 that is energized at the time of defrosting is disposed in the lower space of the evaporator 110.
  • a cold air distribution chamber 119 is provided on the back surface of the freezer compartment 103, and a cold air discharge port 121 and a cold air discharge port 122 are provided continuously to the cold air distribution chamber 119.
  • a door 123 and a door 124 are provided at the opening of the freezer compartment 103, and the freezer compartment 103 is closed so that cold air does not flow out of the freezer compartment 103.
  • Both the door 123 and the door 124 are drawer-type doors.
  • the door 123 and the door 124 are used by being pulled out toward the front side of the refrigerator, that is, the left side as shown in FIG.
  • frame bodies 125 and 126 are provided behind the door 123 and the door 124, respectively.
  • an upper container 127, a lower container 128, and a slide-type middle container 132 placed on the upper part of the lower container 128 are placed.
  • a cold storage material 129 is placed on the detection surface which is the surface facing the infrared sensor 113 on the bottom surface of the upper container 127.
  • the regenerator material 129 is set to a melting temperature of ⁇ 15 ° C., which is lower than the freezing temperature of food that is generally frozen and higher than the temperature of the freezer compartment 103. Further, the filling amount of the regenerator material 129 is set to an amount that does not completely melt even when food is put on and placed on the regenerator material 129.
  • a cold air inlet 130 for sucking cold air and guiding it to the evaporator 110 is provided at the lower back of the freezer compartment 103.
  • the food 131 is placed and stored on the cold storage material 129 by the user's hand.
  • the infrared sensor 113 generally detects the amount of infrared rays radiated from an object in the visual field range, converts it to an electrical signal, measures the reference temperature of the ambient temperature of the infrared light receiver 140, and produces an electrical signal. And a thermistor 142 that converts the thermistor 142 into the infrared element portion 143.
  • the purpose is to detect the temperature of the food 131, but the infrared sensor 113 detects the temperature of the food 131 and at the same time detects the temperature within the field of view of the infrared sensor 113.
  • the amount of infrared rays emitted from the wall surface of the chamber 104, the food 131 stored in the freezer compartment 104, the cold storage material 129, and the like is detected.
  • the ambient temperature of the infrared light receiving unit 140 is measured as a reference temperature.
  • a control board (not shown) for controlling the refrigerator is electrically connected to a wire 146 to which the infrared element portion 143 is electrically connected, a connector 144, and a printed board (not shown) board 141. ) And the connector 144 are electrically connected.
  • the infrared element unit 143 outputs the voltage of the reference temperature of the thermistor 142 and the voltage of the infrared light amount of the infrared light receiving unit 140 to a control board (not shown), thereby detecting the detected temperature of the measured object.
  • the control device (not shown) makes a determination based on the calculated detected temperature.
  • the infrared condensing member 148 covers the periphery of the infrared element unit 143 in a state of being in thermal contact with the infrared element unit 143 and is provided without a gap from the substrate 145, and is an infrared ray of disturbance radiated from other than the food 131 and the cold storage material 129.
  • a through-hole 150 that restricts the viewing angle ⁇ ° is provided so as to lead to the infrared light receiver 140.
  • tip part 150b of the through-hole of the infrared condensing member 148 is set to 3 mm or more.
  • the viewing angle is 30 ° to 60 °.
  • the viewing angle is preferably about 50 °.
  • the through-hole 150 has the highest infrared detection intensity at the center within the circle of the detection range, and the detection intensity becomes weaker toward the end. Therefore, it is possible to increase the intensity of the infrared amount of the detected object by further narrowing the viewing angle of the infrared sensor and to reliably detect the temperature of the object, but a part of the viewing angle is applied to the front end surface of the through-hole 150. Therefore, at least the inner wall surface 150a of the through-hole of the infrared condensing member 148 located within the visual field range of the infrared sensor is heated by the opening and closing of the door, for example.
  • the through-hole of the infrared condensing member 148 In order to increase the heat holding force of the inner wall surface 150a, the thermal conductivity is increased and the heat capacity is increased so that the heat holding force of the infrared condensing member 148 itself is increased. It is devised to so that.
  • the heat condensing member 148 has a higher thermal conductivity than a resin generally used as a conventional condensing member. It is made of a high material such as aluminum, titanium, stainless steel, iron, copper, or a material containing them. In particular, from the viewpoint of being lightweight, having high thermal conductivity and high heat capacity, and partially exposing the surface of the inside of the freezer compartment 3, those mainly composed of aluminum having high corrosion resistance are preferable.
  • the infrared sensor 113 malfunctions due to friction caused by a cloth or the like that the user cleans the inside of the refrigerator or static electricity generated by the human body or the element itself.
  • it is a powder oxide that is electrically insulated and has high thermal conductivity and high heat capacity.
  • PPS polystyrene
  • ABS polystyrene
  • LSP liquid crystal
  • the powder oxide is 80% or more in terms of the ratio
  • the electrical insulation is 1.0 ⁇ 10 14 ⁇ ⁇ m or more with a specific resistance equivalent to that of a general resin member. Constant It is also possible to satisfy the electrical insulation being.
  • the inner wall front end portion 150b of the through-hole of the infrared light collecting member 148 and the inner wall end portion 150c of the through-hole of the infrared light collecting member 148 due to temperature fluctuation caused by opening and closing the door. Therefore, by setting the weight ratio of the powder oxide to approximately 85% or more, the thermal conductivity is increased, the thermal conductivity is 2 W / m ⁇ K or more, and per unit mass.
  • the heat capacity is preferably 750 J / kg ⁇ ° C. or higher.
  • the heat capacity is increased by surrounding the infrared condensing member 148 with the condensing opening 151 of the infrared mounting case 147.
  • the temperature fluctuation of the infrared condensing member 148 is further reduced.
  • the infrared mounting case 147 functions as a heat insulating member surrounding the infrared condensing member 148 and prevents the outer surface of the infrared condensing member 148 from being exposed to the outside air, the infrared condensing member By reducing the contact area with the outside air of 148 and slowing the temperature change of the infrared ray condensing member at a constant temperature, the followability to the temperature fluctuation due to the disturbance can be further relaxed.
  • the infrared mounting case 147 is provided with a condensing opening 151 penetrating in the same shape as the side surface of the infrared condensing member 148 in a portion located substantially at the center.
  • a plurality of protruding protrusions 152 extending toward the surface are provided.
  • the infrared attachment case 147 is provided so that it may fit with the recessed part 149 partially formed in the part located in the approximate center of the upper stage heat insulation partition plate 104.
  • a projection opening 152 a that opens in communication with the through-hole 150 of the infrared light collecting member 148 is provided on the inner circle side of the projection 152. It is assumed that the projection opening 152a is opened in a larger area than the through-hole 150.
  • the periphery of the condensing opening 151 is formed by a cylindrical projecting portion surrounded by a wall surface extending toward the inside of the warehouse, a step is formed between the infrared condensing member 148 and the projecting portion.
  • a warm air pool of the steam from the food 131 is likely to be generated in the inner (inside) space of the cylindrical protrusion 152.
  • the temperature gradient between the front end surface and the end surface of the infrared condensing member 148 is generated, which causes a detection error of the infrared sensor 113.
  • a plurality of protrusions 152 are provided to prevent this.
  • the gap h3 it is difficult to collect warm air around the protrusion 152 due to the influence of disturbance (for example, door opening / closing, hot food, etc.) that changes the ambient temperature of the infrared sensor 113. It is provided. That is, the plurality of protrusions 152 are not continuous and are provided in the infrared mounting case 147 in an independent manner.
  • the protrusion 52 has a shape in which the wind easily flows, and by providing the gap h3 ′ on the side facing the gap h3 between the adjacent protrusions 152 and the protrusion opening 152a, the resistance of the wind The shape is such that the wind can flow more easily.
  • the adjacent protrusions 152 are arranged at four positions so as to surround the infrared element 143 of the infrared sensor 113 with an angle of 90 °, and a shape in which wind flows sufficiently. It has become. Moreover, as shown in FIG. 9, it installs so that two places of the four protrusion parts 152 may become a horizontal direction with respect to the front-back direction X of a refrigerator. Furthermore, the remaining two places are installed so as to be horizontal with respect to the left-right direction Y of the refrigerator orthogonal to the front-rear direction X of the refrigerator.
  • the protrusions 152 are not continuous on the diameter d1 of the protrusion opening 152a, which is the inner space of the protrusion 152, and a plurality of the protrusions are provided intermittently, so that the air path resistance can be further reduced. It becomes. Further, the protrusion 152 is positioned by point contact on the diameter d1 of the protrusion opening 152a that is an inner space of the protrusion 152. Specifically, only the tip end portion of the projection 152 having a semicircular diameter is located on the diameter d1 of the projection opening 152a.
  • the protrusion 152 has a diameter of 1 with respect to the innermost diameter d3 of the linear cross section of the protrusion 152 that communicates with the semicircular portion at the tip of the protrusion. Occupies about / 4.
  • the wall surface 104a in the direction of the freezer compartment 103 which is the storage room for the upper heat insulating partition plate 104 other than the recess 149, the outer surface 147a of the infrared mounting case on the freezer compartment side, and the front end surface 148a of the infrared condensing member are substantially flush with each other.
  • the member 148 is provided so that a temperature gradient between the front end surface and the end surface of the member 148 is difficult to occur.
  • the tip surface 148a of the infrared condensing part is provided in the same plane, and has a shape with little resistance when the wind flows and difficult to collect warm air.
  • the protrusion 152 it is possible to prevent the towel from touching the infrared sensor 113 directly at the time of cleaning, etc., and malfunction or failure of the infrared sensor 113 due to static electricity due to the friction of the towel or instantaneous discharge of static electricity charged on the human body, Or destruction of the infrared element 143 of the infrared sensor 113 can be prevented.
  • the protrusion 152 is formed as a separate member from the infrared condensing member 148, so that the protrusion may be touched by the user because it is located closest to the storage chamber of the infrared sensor 113. Since the protrusion 152 and the infrared sensor 113 are arranged via the infrared condensing member 148 as an interposed member without the 152 being in direct contact with the infrared sensor 113, static electricity generated when the user touches the protrusion 52. In addition, malfunction or failure of the infrared sensor 113 due to instantaneous discharge of static electricity charged on the human body, or destruction of the infrared element 143 of the infrared sensor 113 can be prevented.
  • the shape of the protrusion 152 located in the visual field range of the infrared sensor 113 is devised, Since it is difficult to accumulate warm air around the protrusion 152, the detection accuracy of the infrared sensor 113 can be further improved.
  • the protrusion 152 can be made of a different material by forming it as a member different from the infrared condensing member 148, and the protrusion 152 is made of a material having a lower thermal conductivity than the infrared condensing member 148. It is desirable to form, thereby preventing the heat of the protrusion 152 from being transferred to the infrared condensing member 148, and the temperature of the infrared condensing member 48 becomes more stable, thereby improving the detection accuracy of the infrared sensor 113. It is possible to make it.
  • the charge amount charged to the human body may exceed 1000 V, and by setting the certain spatial distance h2 to 6 mm or more, even if the user tries to touch the infrared sensor 113, the finger does not enter. Therefore, in a range where the safety of the user is higher and the viewing angle of the infrared sensor 113 does not overlap the protrusion 152, the spatial distance h2 is preferably 6 mm, and the diameter d1 of the protrusion opening 152a which is the inner diameter of the protrusion 152 is In addition to preventing the entry of fingers from the vertical direction by setting the diameter within 6 mm, it is possible to prevent the entry of fingers from the side surface direction by setting the dimension of the gap h3 between adjacent protrusions 152 to 4 mm or less. It is possible to ensure a sufficient insulation distance in actual use of the refrigerator.
  • a slope portion 153 that is formed in a curved shape without a right angle portion extending in a lateral direction from the protrusion opening 152a in the inner circle of the protrusion 152 and reaching the surface of the infrared mounting case 147. Preventing damage to food 131 due to catching of towels, etc. at the time of cleaning, food 131 stored in the storage chamber etc. on projection 152, or injury due to direct contact with projection 152, etc.
  • the slope portion 153 even if the door 123 and the door 124 are opened and closed, the wind easily flows through the upper heat insulating partition plate 104 on the ceiling surface of the freezer compartment 103 to the slope portion 153, and the warm air pool is infrared.
  • the light collecting member 148 is provided so that a temperature gradient between the front end surface and the end surface of the light collecting member 148 is more difficult to be generated.
  • the slope portion on the outer surface of the protrusion 152 is formed in a shape that does not have a right-angle portion, and is formed into a shape that is not easily caught by being curved.
  • the operation of the refrigeration cycle (not shown) is started, and the refrigerant flows through the evaporator 110 to generate cold air.
  • the generated cold air is sent to the cold air distribution chamber 119 by the blower 111, distributed from the cold air discharge port 121 and the cold air discharge port 122, and discharged into the freezer chamber 103.
  • the freezing chamber 103 is cooled to a predetermined temperature by the cold air discharged into the freezing chamber 103, and at the same time, the cool storage material 129 is also cooled.
  • the freezer compartment 103 is adjusted to a temperature at which the food can be stored frozen for a certain period of time, for example, ⁇ 20 ° C., but the heat storage material 129 uses a material whose melting temperature is set to ⁇ 15 ° C.
  • the cool storage material 129 is completely frozen, and the cool air that has cooled the inside of the cooling chamber 103 enters the cool air generation chamber 109 from the cool air suction port 130, and the evaporator 110 Cooled again.
  • the voltage output from the infrared sensor 113 is V and the thermistor 142 measures the ambient temperature of the infrared light receiving unit 140.
  • the temperature S
  • the amount of infrared rays is measured by the infrared light receiving unit 140 and the average temperature of the infrared rays is B
  • ⁇ is a coefficient.
  • the infrared sensor 113 approaches the value of the output voltage V to 0, and the reference temperature becomes the temperature S in the measurement range. If the temperature difference is large, the amount of infrared light detected by the infrared light receiving unit 140 increases, and the output voltage also increases.
  • the ambient temperature S of the infrared sensor 113 serving as the reference temperature also increases accordingly, the difference between the ambient temperature S and the average temperature B becomes small, and the warm food. Even if the absolute temperature is high, it cannot be detected that food having a relatively high temperature has been introduced, and the detection accuracy of the infrared sensor 113 will be reduced.
  • the detection temperature of the infrared sensor 113 when the door 123 is closed is detected including the surface temperature of the cool storage material 129 placed on the bottom surface of the upper container 127 which is a detection surface provided on the side facing the infrared sensor 113.
  • the detection surface of the infrared sensor 13 By forming the surface detected by the infrared sensor 13 with the cold storage material 129 having a cold storage function in this way, for example, even when there is a disturbance such as the inflow of warm air, the detection surface of the infrared sensor also has a high heat holding power and the disturbance. Since the temperature followability with respect to can be relaxed, it is less affected by temperature fluctuation due to disturbance, and a stable temperature can be maintained, so that higher detection accuracy can be obtained.
  • the detection surface provided on the side facing the infrared sensor 113 and the inner wall surface 150a of the through hole of the infrared condensing member 148 positioned in the visual field range of the infrared sensor 113 is used.
  • the temperature followability of the portion located within the visual field range of the infrared sensor can be improved. Since it can be mitigated, it becomes possible to more accurately detect the temperature of the food 131 that is the object of temperature detection by the infrared sensor 113.
  • a projection opening 152 a that opens in communication with the through-hole 150 of the infrared condensing member 148 is provided on the inner circle side of the projecting portion 152 provided on the storage chamber side of the infrared condensing member 148.
  • the projection opening 152a is opened in a larger area than the through-hole 150, so that the projection 152 located in the visual field range of the infrared sensor 113 is made smaller, so that the temperature of the projection 152 is reduced.
  • the protrusions 152 are arranged such that two of the four protrusions 152 are in the horizontal direction with respect to the front-rear direction X of the refrigerator (the front-rear direction X is the direction of the air passage through which the cold air flows). It is installed in. Furthermore, the remaining two places are installed so as to be horizontal with respect to the left-right direction Y of the refrigerator orthogonal to the front-rear direction X of the refrigerator.
  • the protrusion is substantially in point contact with the diameter d1 of the protrusion opening 152a, which is the inner space of the protrusion 152, specifically, the protrusion opening.
  • the protrusion 152 has a diameter of 1 with respect to the innermost diameter d3 of the linear cross section of the protrusion 152 that communicates with the semicircular portion at the tip of the protrusion. Occupies about / 4.
  • the protrusion 152 occupies about 1/4 with respect to the innermost diameter d3 of the linear cross section. In some cases, it is preferable that the protrusion 152 be at least 1/3 or less of the innermost diameter d3 of the straight section.
  • the door 123 When the user stores the food 131, for example, the door 123 is pulled out. At this time, the temperature detection of the infrared sensor 113 detects the temperature in the lower container 128. Then, the door 123 is in an open state, and the warm air of the outside air flows from the opening surface of the door 123, passes through the upper heat insulating partition plate 104 of the ceiling surface of the freezer compartment 103, and the warm air flows along the slope portion 153. Since the outer surface of the mounting case 147 and the front end surface of the infrared condensing part 148 are in the same plane, even when the door is opened, the wind flows through the slope part 153, so the temperature fluctuation due to warm air accumulation is small and abrupt. It is possible to suppress erroneous detection due to a rise or fall caused by a change in ambient temperature, and to improve the stability of the detection accuracy of the infrared sensor 113.
  • the infrared sensor 113 When cleaning the inside of the freezer compartment 103 or the like, the infrared sensor 113 is charged in a state where static electricity is charged due to friction of a towel or the like, and the static electricity tends to accumulate in the human body when the air is dry depending on the season or the season. When you touch, an instantaneous discharge occurs from the tip of your fingertip or towel. Then, when the discharge energy is applied, noise enters the infrared element 143 by mistake, so that the infrared sensor 113 malfunctions or the infrared element 143 itself cannot withstand the electrostatic withstand voltage, so that the infrared element 143 has an internal disconnection. Or cause a short circuit.
  • the heat insulating box composed of a plurality of heat insulating compartments, the heat insulating partition for partitioning the heat insulating box, the storage room partitioned by the heat insulating partition, and the heat insulating partition
  • Infrared condensing member provided with a concave portion formed in, an infrared sensor for detecting the amount of radiation radiated from the stored item stored in the storage room, and a through-hole surrounding the infrared sensor and guiding the amount of radiation to the infrared sensor
  • an infrared mounting case that houses the infrared sensor, and a light collecting opening that penetrates the infrared mounting case in the same shape as the side surface of the infrared light collecting member, and the infrared mounting case is embedded in the recess and faces the storage chamber.
  • the insulation distance from electrical components (infrared sensors) defined by various laws and regulations relating to home appliances can be reduced.
  • the charged voltage charged to the human body may exceed 1000V.
  • an instantaneous discharge is generated from static electricity charged to the human body, and the discharge energy is applied. Even in this case, it is possible to further prevent malfunction or failure of the infrared sensor or destruction of the element of the infrared sensor.
  • the inner diameter of the plurality of protrusions protruding around the condensing opening is 6 mm or less, it is possible to prevent direct contact with an electrical component (infrared sensor) due to the insertion of a finger from the vertical direction inside the protrusion. Can do.
  • the protrusions are arranged at equal intervals around the opening, and the distance between the protrusions is set to 4 mm or less, so that an electric component (infrared sensor) by direct insertion of a finger from the side surface inside the protrusion can be directly connected. Touching can be prevented.
  • the front end surface of the infrared condensing member is substantially the same as the outer surface of the infrared mounting case on the storage chamber side, so that there is no step between the infrared mounting case and the infrared condensing member, so that warm air generated by opening and closing the door can be prevented.
  • the temperature fluctuation is small even when the door is opened by storing the inflow and food, etc., and eliminating the warming up of the steam from the food, so false detection due to a rise or fall due to a sudden change in ambient temperature And the stability of detection accuracy of the infrared sensor can be improved.
  • the wall surface 104a in the direction of the freezer compartment 3 that is the storage chamber of the upper heat insulating partition plate 104 other than the recess 149 and the outer surface 147a of the infrared mounting case on the freezer compartment side are substantially in the same plane.
  • the outer surface 147a of the infrared mounting case on the freezer compartment side may protrude from the wall surface 104a in the direction of the freezer compartment 103 toward the storage chamber side, and in this way, the infrared surface is more infrared than the wall surface 104a.
  • the outer surface 147a on the freezer compartment side of the mounting case has a convex shape, so that even when the door 123 and the door 124 are in an open / closed state, it is possible to further prevent warm air from being collected around the protruding portion of the infrared mounting case 147.
  • the attachment surface 147b provided with at least the protrusion 152 has a convex shape, and the wall surface 104a and the outer surface 147a on the freezer compartment side of the infrared attachment case are on the same surface, Only the mounting surface 147b may protrude smoothly. In this case, the rigidity of the protrusion 152 around the mounting surface 147 can be further increased, and a non-contact sensor having a higher-quality protrusion 52 is provided. Can be realized.
  • the infrared sensor of the refrigerator according to the present invention can improve detection accuracy without being affected by ambient disturbances (for example, door opening and closing and temperature fluctuation due to hot food), and various laws and regulations relating to home appliances.
  • the specified electrical insulation is ensured and the product quality is improved, and it can be applied not only to household refrigerators, but also to commercial refrigerators and measuring instruments in environments with large ambient influences.
  • the refrigerator according to the present invention forms a protrusion and a slope on a part of the infrared mounting case to which the infrared sensor is attached, and has a certain spatial distance from the infrared element part, so that the infrared sensor is erroneously detected due to static electricity.

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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)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
PCT/JP2009/001111 2008-03-14 2009-03-12 冷蔵庫 WO2009113310A1 (ja)

Priority Applications (2)

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CN2009801090549A CN101970962B (zh) 2008-03-14 2009-03-12 冷藏库
EP20090718578 EP2267387A4 (en) 2008-03-14 2009-03-12 FRIDGE

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JP2008-065413 2008-03-14
JP2008065413 2008-03-14
JP2008-157756 2008-06-17
JP2008157756 2008-06-17
JP2008202835A JP2009243869A (ja) 2008-03-14 2008-08-06 冷蔵庫
JP2008-202835 2008-08-06
JP2008-231738 2008-09-10
JP2008231738A JP5077160B2 (ja) 2008-06-17 2008-09-10 冷蔵庫

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CN105605874B (zh) * 2016-01-22 2018-07-13 青岛海尔股份有限公司 冰箱及其内部温度的检测方法
EP3853541B1 (en) * 2018-09-21 2023-04-12 Arçelik Anonim Sirketi A cooling device comprising an ice cream maker
CN110411111A (zh) * 2019-08-14 2019-11-05 海信（山东）冰箱有限公司 一种自动开关门冰箱
CN113739924A (zh) * 2020-05-30 2021-12-03 荣耀终端有限公司 电子设备
CN113175784A (zh) * 2021-05-05 2021-07-27 广东奥马冰箱有限公司 一种自动识别速冻需求的制冷器具
CN113175783A (zh) * 2021-05-05 2021-07-27 广东奥马冰箱有限公司 一种自动识别速冻需求的控制方法
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CN110887300B (zh) * 2018-09-11 2022-02-01 东芝生活电器株式会社 冰箱

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CN101970962B (zh) 2012-12-12
CN101970962A (zh) 2011-02-09
EP2267387A4 (en) 2015-04-29
CN102564051A (zh) 2012-07-11
EP2267387A1 (en) 2010-12-29

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