JP2007292378A - Cold storage - Google Patents

Abstract

An object of the present invention is to sufficiently reduce power consumption while preventing dew condensation at the peripheral edge of a front opening of a storage room.
A door 5 that opens and closes a front opening of a storage chamber 2, a dew condensation prevention heater 19 disposed on a peripheral edge 15 a of the front opening of the storage chamber 2 in an outer peripheral wall 15 of the storage chamber 2, The inside temperature sensor 26 that detects the temperature T2 of the interior, the outside temperature sensor 27 that detects the temperature T1 of the outside air, and the control unit 30 are included. When the temperature T2 in the storage chamber 2 is equal to or lower than the low room temperature D1, the controller 30 intermittently drives the condensation prevention heater 19 when the outside air temperature T1 is equal to or lower than the reference temperature K2, and the outside air temperature T1 is equal to the reference temperature K2. Is exceeded, the dew condensation prevention heater 19 is kept on. When the temperature T2 in the storage chamber 2 exceeds the low room temperature D1, the control unit 30 maintains the condensation prevention heater 19 in the off state when the outside air temperature T1 is equal to or lower than the reference temperature K2, and the outside air temperature T1 is the reference temperature. When K2 is exceeded, the condensation prevention heater 19 is intermittently driven.
[Selection] Figure 1

Description

  The present invention relates to a low-temperature storage for storing a storage object such as grain and vegetables such as brown rice in a storage room at a low temperature.

  In Patent Literature 1, a partition body that closes the gap between the left and right doors when the door is closed is disposed at the swinging tip of one of the pair of left and right doors, and condensation is prevented in the partition body. There is disclosed a low-temperature storage in which a heater is provided to prevent condensation on the partition. Patent Document 2 discloses a low-temperature storage in which a dew condensation prevention heater is arranged at the peripheral edge of the front opening of the storage chamber to prevent dew condensation at the peripheral edge.

  In Patent Document 1, the dew condensation prevention heater is turned on when the outside air temperature is higher than the set temperature, and the dew condensation prevention heater is intermittently driven when the outside air temperature is equal to or lower than the set temperature. In Patent Document 2, the dew condensation prevention heater is turned on when the temperature difference between the temperature in the storage chamber and the outside air temperature is large, and the dew condensation prevention heater is turned off when the temperature difference is small.

Japanese Patent Laid-Open No. 5-71854 (FIGS. 1 and 4) Japanese Patent Laid-Open No. 2001-21255 (paragraph numbers 0015 and 0032, FIG. 1) Japanese Patent Laying-Open No. 2005-16894 (FIG. 3) Japanese Patent Laid-Open No. 10-339547 (FIG. 1)

  In Patent Document 1, the on-drive and intermittent drive of the condensation prevention heater are switched based only on the outside air temperature. For this reason, even in a situation where condensation is unlikely to occur due to a relatively high temperature in the storage chamber, the condensation prevention heater is driven, resulting in unnecessary power consumption by the condensation prevention heater. .

  In Patent Document 2, it is only necessary to switch on or off the dew condensation prevention heater. For this reason, it is impossible to cope with a situation in which condensation can be prevented without increasing the amount of heat generated by the condensation prevention heater, and wasteful power consumption in the condensation prevention heater is caused accordingly. In other words, Patent Documents 1 and 2 cannot prevent condensation even if condensation can be prevented.

  Accordingly, an object of the present invention is to provide a low-temperature storage that can sufficiently reduce power consumption while preventing condensation at the peripheral edge of the front opening of the storage chamber.

  As shown in FIG. 1 and FIG. 3, the low-temperature storage targeted by the present invention includes a storage chamber 2 for storing an object to be stored, a door 5 for opening and closing a front opening of the storage chamber 2, and an outer periphery of the storage chamber 2. A dew condensation prevention heater 19 disposed on the peripheral edge 15a of the front opening of the storage chamber 2 in the wall 15, an internal temperature sensor 26 for detecting the temperature T2 in the storage chamber 2, and an outside air temperature for detecting the outside air temperature T1. A sensor 27 and a control unit 30 that controls the dew condensation prevention heater 19 are provided.

  In the present invention, as shown in FIG. 4, when the temperature T <b> 2 in the storage chamber 2 is equal to or lower than the preset low room temperature D <b> 1, the control unit 30 condenses when the outside air temperature T <b> 1 is equal to or lower than the preset reference temperature K <b> 2. The prevention heater 19 is driven to be suppressed, and when the outside air temperature T1 exceeds the reference temperature K2, the condensation prevention heater 19 is maintained in the ON state. Further, when the temperature T2 in the storage chamber 2 exceeds the low room temperature D1, the control unit 30 maintains the condensation prevention heater 19 in an off state when the outside air temperature T1 is equal to or lower than the reference temperature K2, and the outside air temperature T1 is When the temperature exceeds the reference temperature K2, the condensation prevention heater 19 is driven to be suppressed.

  The suppression driving here includes intermittent driving in which the condensation prevention heater 19 is repeatedly turned on and off at a predetermined time interval, and low power driving in which the power supplied to the condensation prevention heater 19 is reduced. included. The low room temperature D1 is selected from a temperature of about 10 ° C., for example. The reference temperature K2 is selected from a temperature within a range of about 18 to 22 ° C., for example. The peripheral portion 15 a of the front opening of the storage chamber 2 includes a front portion on the outer surface of the outer peripheral wall 15 of the storage chamber 2.

  When the temperature T2 in the storage chamber 2 is equal to or lower than the low room temperature D1, the control unit 30 prevents condensation when the temperature difference between the temperature T2 in the storage chamber 2 and the outside air temperature T1 is equal to or less than a predetermined value set in advance. When the heater 19 is driven to suppress and the temperature difference exceeds the predetermined value, the condensation prevention heater 19 is maintained in the ON state, and when the temperature T2 in the storage chamber 2 exceeds the low room temperature D1, the temperature The condensation prevention heater 19 may be maintained in an off state when the difference is less than or equal to the predetermined value, and the condensation prevention heater 19 may be driven to be suppressed when the temperature difference exceeds the predetermined value. The predetermined value here is selected from a range of about 8 to 12 ° C., for example.

  When the outside air temperature T1 exceeds the preset high humidity temperature K1 higher than the reference temperature K2, the control unit 30 determines whether the temperature T2 in the storage chamber 2 is equal to or lower than the low room temperature D1, The condensation prevention heater 19 may be forcibly maintained on. The high humidity temperature K1 here is selected from the range of about 25-35 degreeC, for example.

  The control unit 30 stores a plurality of types of combinations of the set values of the low room temperature D1, the reference temperature K2, and the high humidity temperature K1 in advance, and the operation unit 20 that can select the combination of the set values. Keep it. The control unit 30 may control the dew condensation prevention heater 19 based on the set values selected by the operation unit 20.

  As shown in FIGS. 1 and 2, the door 5 is a pair of left and right double doors 5 and 5, and the left and right doors are disposed at the swinging tip of one of the left and right doors 5 and 5. You may arrange | position the partition 16 which closes the clearance gap between the doors 5 * 5 when 5 * 5 is closed. In this case, the dew condensation prevention heater 17 is arranged on the partition 16, and the control unit 30 forms the dew condensation prevention heater 17 arranged on the partition 16 on the peripheral edge 15 a of the front opening of the storage chamber 2. Control may be performed in conjunction with the prevention heater 19.

  According to the present invention, the dew condensation prevention heaters 17 and 19 are controlled in three stages of ON driving, suppression driving or OFF based on the temperature T2 in the storage chamber 2 and the outside air temperature T1, so that the front opening of the storage chamber 2 is opened. The power consumption of the dew condensation preventing heaters 17 and 19 can be sufficiently and reliably reduced while reliably preventing the dew condensation on the peripheral edge portion 15a and the partition 16.

  If the operation unit 20 can select the combination of the set values of the low room temperature D1, the reference temperature K2, and the high humidity temperature K1, the low room temperature D1, the reference temperature K2, and the high humidity temperature can be easily operated. K1 can be set in advance, and the setting time of each set value can be reduced.

  FIGS. 1 and 2 show a low-temperature storage targeted by the present invention. As shown in FIG. 1, the storage body 1 includes a storage room 2 for storing storage items such as packed brown rice. And a machine room 3 disposed above the storage room 2. A pair of left and right doors 5, 5 are provided at the front opening of the storage chamber 2, and the front opening of the storage chamber 2 is opened and closed by the doors 5, 5. The outer peripheral wall 15 surrounding the doors 5 and 5 and the storage chamber 2 has a heat insulating structure.

  In the machine room 3, a duct 6 for circulating cold air, a compressor 31 (see FIG. 3) as a refrigerator, a condenser 9 and the like are arranged. A circulation fan 10 and a cooler 11 are arranged in the duct 6, and the refrigerant circulates in a pipe line connecting the compressor 31, the condenser 9, the cooler 11, and the like. In the duct 6, the air inlet 12 and the air inlet 13 are opened at the ceiling of the storage chamber 2, and the circulation fan 10 is driven so that the air in the storage chamber 2 flows from the air inlet 12 to the duct 6. After being sucked in and cooled by the cooler 11, the air is supplied from the air supply port 13 into the storage chamber 2. The duct 6 has a heat insulating structure.

  When the left and right doors 5 and 5 are closed (the state in FIG. 2) on the back side of the swinging tip of one of the doors 5 and 5 (left side in FIG. 1), the left and right doors A partition 16 that closes the gap between 5 and 5 is arranged. As shown in FIG. 1, the partition 16 is formed in a plate shape extending between the upper and lower ends of one door 5.

  As shown in FIG. 1 and FIG. 2, a heater 17 for preventing condensation is provided in the partition 16 in the vertical direction. A heater 19 for preventing dew condensation is provided along a peripheral edge portion 15 a of the front opening of the storage chamber 2 in the outer peripheral wall 15 of the storage chamber 2. The dew condensation prevention heater 17 prevents dew condensation on the partition 16, and the dew condensation prevention heater 19 prevents dew condensation on the peripheral edge 15 a of the front opening of the storage chamber 2.

  On the front surface of the machine room 3, as shown in FIG. 1, there is an operation panel (operation panel having an operation switch for setting the temperature in the storage room 2 and a display unit for displaying the temperature in the storage room 2). Part) 20 is arranged. A large number of ventilation holes 23 are arranged on one end side (right side in FIG. 1) of the front side of the machine room 3, and a cooling fan 25 is arranged on the back side of the ventilation holes 23 so as to face the condenser 9. ing. By the cooling fan 25, the outside air is sucked into the machine room 3 through the vent hole 23 and blown to the condenser 9 and the like.

  In the vicinity of the air inlet 12 of the duct 6, an internal temperature sensor 26 (FIG. 3) that detects the temperature in the storage chamber 2 is disposed. An outside air temperature sensor 27 (FIG. 3) for detecting the temperature of the outside air is disposed in the machine room 3 and in the vicinity of the vent hole 23.

  Inside the storage body 1 is disposed a control unit 30 that controls the condensation prevention heaters 17 and 19 and the compressor 31. The control unit 30 includes a compressor 31 and a circulation fan so that the temperature T1 in the storage chamber 2 detected by the internal temperature sensor 26 becomes a set temperature (for example, 13 ° C.) D0 set in advance on the operation panel 20 or the like. 10 drive motors 32, the drive motor 33 of the cooling fan 25, and the like are controlled. The set temperature D0 can be set within a temperature range of 2 to 15 ° C., for example.

  The control unit 30 controls the dew condensation prevention heater 17 disposed on the partition 16 in conjunction with the dew condensation prevention heater 19 disposed on the peripheral edge 15 a of the front opening of the storage chamber 2. The dew condensation prevention heaters 17 and 19 are controlled on and off based on the detected outside air temperature T1 and the temperature T2 in the storage chamber 2 detected by the internal temperature sensor 26, respectively.

  The control operation of the dew condensation prevention heaters 17 and 19 will be specifically described with reference to the flowchart of FIG. When the operation is started, the control unit 30 determines whether or not the outside air temperature T1 exceeds a preset high humidity temperature (for example, 28 ° C.) K1 in step S1, and the outside air temperature T1 for summertime or the like. Is higher than the high humidity temperature K1 (YES in step S1), the condensation prevention heaters 17 and 19 are forcibly turned on in step S2. Then, it returns to step S1 and repeats the process after step S1.

  That is, in summer, the temperature tends to increase and the humidity tends to increase. Condensation is likely to occur on the outer surface of the partition 16 and the peripheral edge 15a of the front opening of the storage chamber 2 by the high humidity. For this reason, when the outside air temperature T1 exceeds the high-humidity temperature K1, the control unit 30 determines that condensation is likely to occur, and the condensation occurs regardless of the temperature T2 in the storage chamber 2. The prevention heaters 17 and 19 are forcibly turned on. Thereby, the peripheral part 15a of the front opening of the partition 16 and the storage chamber 2 is warmed, and dew condensation is prevented. The prevention of condensation includes the case where the condensation that has already occurred is evaporated by the heat of the heaters 17 and 19.

  When the outside air temperature T1 is not higher than the high humidity temperature K1 in step S1 due to other than summertime (NO in step S1), the control unit 30 sets the storage room temperature T2 in step S3 to the low room temperature set in advance. It is determined whether or not the temperature (for example, 10 ° C.) is equal to or lower than D1. If the storage room temperature T2 is lower than the low room temperature D1 because the set temperature D0 is set low (YES in step S3), the outside air temperature T1 is set in advance to the reference temperature (step S4). For example, it is determined whether it is 20 ° C. or less.

  When the outside air temperature T1 is equal to or lower than the reference temperature K2 (YES in step S4), the control unit 30 turns on / off the condensation prevention heaters 17 and 19 at predetermined time intervals in step S5. For example, intermittent driving (suppression driving) in which the condensation prevention heaters 17 and 19 are turned on for 10 minutes and then turned off for 10 minutes is performed. Then, it returns to step S1 and repeats the process after step S1. The reference temperature K2 is set to a value lower than the high humidity temperature K1.

  When the outside air temperature T1 is higher than the reference temperature K2 in step S4 (NO in step S4), the control unit 30 turns on the condensation prevention heaters 17 and 19 in step S6, and maintains the on state. Then, it returns to step S1 and repeats the process after step S1.

  That is, when the storage room temperature T2 is equal to or lower than the low room temperature D1, the temperature of the partition 16 and the peripheral edge portion 15a of the front opening of the storage room 2 is considerably low, and the outside air temperature T1 is not so high. Condensation is likely to occur on the outer surface of the partition 16 and the peripheral edge 15 a of the front opening of the storage chamber 2. Therefore, when the storage room temperature T2 is equal to or lower than the low room temperature D1 and the outside air temperature T1 exceeds the reference temperature K2 lower than the high humidity temperature K1, the controller 30 controls the dew condensation prevention heaters 17. 19 is maintained in the ON state.

  On the other hand, even if the storage room temperature T2 is lower than the low room temperature D1, if the outside air temperature T1 is lower than the reference temperature K2, the temperature difference between the storage room temperature T2 and the outside air temperature T1 becomes small and the degree of occurrence of condensation. Therefore, the heaters 17 and 19 for preventing condensation are intermittently driven to warm the partition 16 and the peripheral edge 15a of the front opening of the storage chamber 2 to some extent, thereby reducing power consumption while preventing condensation. Yes.

  If the storage room temperature T2 is higher than the low room temperature D1 in step S3 (NO in step S3), for example, because the set temperature D0 is set high, the controller 30 causes the outside air temperature T1 in step S7. Is determined to be equal to or lower than the reference temperature K2. When the outside air temperature T1 is equal to or lower than the reference temperature K2 (YES in step S7), the partition 16 and the peripheral edge portion 15a of the front opening of the storage room 2 are not cooled very much, and the storage room temperature T2 and the outside air temperature T1. Condensation is less likely to occur because of the small temperature difference. In response to this, the control unit 30 turns off the condensation prevention heaters 17 and 19 in step S8 and maintains the off state. Then, it returns to step S1 and repeats the process after step S1.

  If the outside air temperature T1 is higher than the reference temperature K2 in step S7 (NO in step S7), the temperature difference between the storage room temperature T2 and the outside air temperature T1 becomes slightly large, so that the degree is small but condensation occurs. There are things to do. Therefore, the controller 30 performs the same intermittent drive as described above on the dew condensation prevention heaters 17 and 19 in step S9. Then, it returns to step S1 and repeats the process after step S1.

  In step S4 and step S7, instead of determining whether or not the outside air temperature T1 is equal to or lower than the reference temperature K2, the temperature difference between the storage room temperature T2 and the outside air temperature T1 is set to a predetermined value (for example, 10 ° C.). ) It may be determined whether or not:

  Even in this case, when the temperature difference is less than or equal to the predetermined value in step S4, the process proceeds to step S5, where the condensation prevention heaters 17 and 19 are intermittently driven, and the temperature difference exceeds the predetermined value. The process proceeds to step S6, and the condensation prevention heaters 17 and 19 are kept on. Similarly, if the temperature difference is equal to or smaller than the predetermined value in step S7, the process proceeds to step S8 to maintain the condensation prevention heaters 17 and 19 in the OFF state, and if the temperature difference exceeds the predetermined value, step S8 is performed. In S9, the condensation prevention heaters 17 and 19 are intermittently driven.

  In Step S5 or Step S9, instead of intermittently driving the condensation prevention heaters 17 and 19, for example, power suppression drive (suppression drive) that reduces the power supplied to the condensation prevention heaters 17 and 19 by half, for example, may be performed. Good.

  Each set value of the low room temperature D1, the reference temperature K2, and the high humidity temperature K1 may be set individually and arbitrarily using a setting switch or the like disposed on the operation panel 20, but the control unit 30 is low. A plurality of combinations (patterns) of combinations of the set values of the room temperature D1, the reference temperature K2, and the high humidity temperature K1 are stored in advance in the control unit 30, and each of the settings is set using a setting switch or the like on the operation panel 20. A combination of values may be arbitrarily selected. In this case, the control unit 30 controls the dew condensation prevention heaters 17 and 19 based on the set values selected by the operation unit 20.

  The combinations of the set values of the low room temperature D1, the reference temperature K2, and the high humidity temperature K1 include a pattern in which the high humidity temperature K1 is 15 ° C., the low room temperature D1 is 18 ° C., and the reference temperature K2 is 20 ° C. Alternatively, a pattern in which the high humidity temperature K1 is 5 ° C., the low room temperature D1 is 35 ° C., and the reference temperature K2 is 40 ° C. is applicable.

  In the above description, the outside air temperature sensor 27 is provided in the vicinity of the vent hole 23 and is used only for detecting the outside air temperature T1, but for example, the outside air temperature sensor 27 is provided on the outlet side of the blast in the condenser 9. May be provided. And the control part 30 calculates | requires the temperature difference of the detected temperature of the outside temperature sensor 27, for example, when stopping the operation | movement of the compressor 31 of a refrigerator, and operating the compressor 31, and this When the temperature difference is small, it may be determined that air is not being blown due to a failure of the cooling fan 25 or the like, and an alarm display or the like may be displayed on the operation panel 20. In this case, the temperature detected by the outside air temperature sensor 27 when the operation of the compressor 31 of the refrigerator is stopped is used as the outside air temperature T1.

  If the storage room temperature T2 does not decrease or does not fall below a preset temperature even when the refrigerator is operated due to leakage of refrigerant gas used in the refrigerator or failure of the compressor 31, control is performed. The unit 30 may control the condensation prevention heaters 17 and 19 to be forcibly turned off regardless of the outside air temperature T1. In this case, in a state where the interior of the storage chamber 2 is not cooled due to the failure or the like, the storage chamber 2 is partially warmed by the condensation prevention heaters 17 and 19 to reduce the increase in the storage chamber temperature T2. be able to.

Front view of the low-temperature storage according to the present invention Cross-sectional view showing main parts of low-temperature storage Block diagram of control system Flow chart showing control operation of condensation prevention heater

Explanation of symbols

2 Storage room 3 Machine room 5 Door 15 Peripheral wall 15a of storage room Peripheral edge 16 of front opening of storage room 17 Partitions 19 and 19 Heater 20 for preventing condensation Operation panel 26 Inside temperature sensor 27 Outside temperature sensor 30 Control part

Claims (5)

The storage chamber (2) for storing the storage object, the door (5) for opening and closing the front opening of the storage chamber (2), and the storage chamber (2) in the outer peripheral wall (15) of the storage chamber (2) A dew condensation prevention heater (19) disposed at the peripheral edge (15a) of the front opening, an internal temperature sensor (26) for detecting the temperature (T2) in the storage chamber (2), and the outside air temperature (T1) An outside air temperature sensor (27) for detecting the dew condensation and a controller (30) for controlling the dew condensation prevention heater (19),
When the temperature (T2) in the storage room (2) is equal to or lower than the preset low room temperature (D1), the control unit (30) is configured so that the outside air temperature (T1) is equal to or lower than the preset reference temperature (K2). When the outside temperature (T1) exceeds the reference temperature (K2), the dew condensation prevention heater (19) is kept on when the dew condensation prevention heater (19) is suppressed and driven.
When the temperature (T2) in the storage chamber (2) exceeds the low room temperature (D1), the dew condensation prevention heater (19) is maintained in the off state when the outside air temperature (T1) is lower than the reference temperature (K2). When the outside air temperature (T1) exceeds the reference temperature (K2), the dew condensation prevention heater (19) is suppressed and driven. The storage chamber (2) for storing the storage object, the door (5) for opening and closing the front opening of the storage chamber (2), and the storage chamber (2) in the outer peripheral wall (15) of the storage chamber (2) A dew condensation prevention heater (19) disposed at the peripheral edge (15a) of the front opening, an internal temperature sensor (26) for detecting the temperature (T2) in the storage chamber (2), and the outside air temperature (T1) An outside air temperature sensor (27) for detecting the dew condensation and a controller (30) for controlling the dew condensation prevention heater (19),
When the temperature (T2) in the storage chamber (2) is equal to or lower than the preset low room temperature (D1), the controller (30) controls the temperature (T2) in the storage chamber (2) and the outside air temperature (T1). The dew condensation prevention heater (19) is suppressed and driven when the temperature difference between the temperature difference is less than a predetermined value, and the dew condensation prevention heater (19) is maintained in the ON state when the temperature difference exceeds the predetermined value. And
When the temperature (T2) in the storage chamber (2) exceeds the low room temperature (D1), the dew condensation prevention heater (19) is maintained in the off state when the temperature difference is equal to or less than the predetermined value, and the temperature difference When the temperature exceeds the predetermined value, the dew condensation prevention heater (19) is suppressed and driven.   The controller (30) forcibly turns on the dew condensation prevention heater (19) when the outside air temperature (T1) exceeds a preset high humidity temperature (K1) higher than the reference temperature (K2). The low-temperature storage of Claim 1 or 2 maintained by. The controller (30) stores a plurality of types of combinations of the set values of the low room temperature (D1), the reference temperature (K2), and the high humidity temperature (K1) in advance.
An operation unit (20) capable of selecting a combination type of the set values is provided,
The low-temperature storage according to claim 3, wherein the controller (30) controls the dew condensation prevention heater (19) based on the set values selected by the operation unit (20). The door (5) is a pair of left and right double doors (5) and (5).
Between the doors (5) and (5) when the left and right doors (5) and (5) are closed at the swinging tip of one of the left and right doors (5) and (5) A partition (16) that closes the gap is arranged,
The partition (16) is provided with a dew condensation prevention heater (17),
The control unit (30) has a dew condensation prevention heater (17) disposed on the partition (16) on the dew condensation prevention heater (19) disposed on the peripheral edge (15a) of the front opening of the storage chamber (2). The low-temperature storage according to claim 1, 2, 3, or 4 that is controlled in conjunction.

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