JP2010230221A - Method and device for controlling door heater in cooling storage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately control a door heater in a cooling storage to securely prevent frost formation on a heat insulating door. <P>SOLUTION: An outside air temperature is detected by an outside air temperature sensor 85, and an indoor temperature of a refrigerating chamber 20 is detected by a right refrigerating chamber temperature sensor 80. A microcomputer 90 compares the outside air temperature output from the outside air temperature sensor 85 with the indoor temperature output of the refrigerating chamber 20 from the right refrigerating chamber temperature sensor 80 and determines whether the outside air temperature is lower than the detected indoor temperature of the refrigerating chamber 20 or not. When it is determined that the outside air temperature is lower than the indoor temperature of the refrigerating chamber 20, the microcomputer 90 performs the duty control of the door heater 39 and performs control so that the duty factor of the door heater 39 becomes 70%. When it is determined that the outside air temperature is not lower than the indoor temperature of the refrigerating chamber 20, the microcomputer 90 calculates a temperature difference between the detected indoor temperature of the refrigerating chamber 20 and the outside air temperature and determines whether the temperature difference is higher than 25&deg;C or not. When the outside air temperature is high and the temperature difference is larger than 25&deg;C, the microcomputer performs control so that the duty factor of the door heater 39 becomes 60%. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a control method and a control device for a door heater in a cooling storage in which a door heater is provided on a heat insulating door that opens and closes a front opening of a cooling storage chamber configured by fitting glass into a frame.

  For example, Patent Literature 1 proposes a technique for appropriately controlling the amount of heat generated by a heater that prevents dew condensation on the glass door. This technology reduces the heat generation amount of the heater when the set temperature set in the temperature setting device is increased, and reduces the heat generation amount of the heater when the set temperature is decreased. To increase.

JP-A-6-159904

  However, in the technology disclosed in Patent Document 1, since the outside air temperature is not taken into consideration, if the temperature difference between the outside and the inside of the cooling storage chamber is large, the above-described control prevents the dew condensation on the front surface of the heat insulating door. There was a problem that it was not enough.

  Then, an object of this invention is to control the door heater in a cooling store | warehouse | chamber appropriately, and to prevent dew condensation of a heat insulation door reliably.

For this reason, the first invention is a control method for a door heater in a cooling storehouse in which a door heater is provided on a heat insulating door that opens and closes a front opening of a cooling storage chamber configured by fitting glass into a frame.
The determination device determines whether the outside air temperature detected by the outside air temperature sensor is equal to or lower than the cooling storage chamber temperature detected by the cooling storage chamber temperature sensor, or whether it is equal to or lower than the set temperature of the cooling storage chamber set by the temperature setting device. ,
When the determination device determines that the outside air temperature is equal to or lower than the cooling storage chamber temperature or equal to or lower than the set temperature, the power supply rate of the door heater disposed on the heat insulating door is set to a predetermined ratio. Control
When the determination device determines that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the control device determines the temperature of the cooling storage room or the temperature difference between the set temperature and the outside air temperature. Within a certain temperature difference range, the energization rate of the door heater is controlled to be sequentially lower than the predetermined ratio.

2nd invention is the control method of the door heater in the cooling storehouse which provided the door heater in the heat insulation door which opens and closes the front opening of the cooling storage room constituted by inserting glass in the frame,
The determination device determines whether or not the outside air temperature detected by the outside air temperature sensor is equal to or lower than the cooling storage chamber temperature detected by the cooling storage chamber temperature sensor, or whether it is equal to or lower than the set temperature of the cooling storage chamber set by the temperature setting device. ,
When the determination device determines that the outside air temperature is equal to or lower than the cooling storage chamber temperature or the set temperature, the control device determines that the energization rate of the door heater disposed on the heat insulating door is a predetermined ratio. Control to be
When the determination device determines that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the control device is responsive to the cooling storage room temperature or the temperature difference between the set temperature and the outside air temperature. Within a temperature difference range, the energization rate of the door heater is controlled so as to be sequentially lower than the predetermined ratio from a larger one to a predetermined temperature.

3rd invention is the control apparatus of the door heater in the cooling storehouse which provided the door heater in the heat insulation door which opens and closes the front opening of the cooling storage room constituted by inserting glass in the frame,
A temperature setting device for setting an indoor temperature of the cooling storage room;
An outside temperature sensor for detecting the outside temperature;
A cooling storage chamber temperature sensor for detecting an indoor temperature of the cooling storage chamber;
A determination device for determining whether the outside air temperature detected by the outside air temperature sensor is equal to or lower than a cooling storage chamber temperature detected by a cooling storage chamber temperature sensor, or whether it is equal to or lower than a set temperature set by the temperature setting device;
When this determination device determines that the outside air temperature is equal to or lower than the temperature in the cooling storage room or equal to or lower than the set temperature, the energization rate of the door heater disposed in the heat insulating door is controlled to be a predetermined ratio. At the same time, if it is determined that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the temperature in the cooling storage room or within a temperature difference range corresponding to the difference between the set temperature and the outside air temperature And a control device for controlling the energization rate of the door heater to be sequentially lower than the predetermined ratio.

4th invention is the control apparatus of the door heater in the cooling storehouse which provided the door heater in the heat insulation door which opens and closes the front opening of the cooling storage room constituted by inserting glass in the frame,
A temperature setting device for setting an indoor temperature of the cooling storage room;
An outside temperature sensor for detecting the outside temperature;
A cooling storage chamber temperature sensor for detecting an indoor temperature of the cooling storage chamber;
A determination device for determining whether the outside air temperature detected by the outside air temperature sensor is equal to or lower than a cooling storage chamber temperature detected by a cooling storage chamber temperature sensor, or whether it is equal to or lower than a set temperature set by the temperature setting device;
When this determination device determines that the outside air temperature is equal to or lower than the temperature in the cooling storage room or equal to or lower than the set temperature, the energization rate of the door heater disposed in the heat insulating door is controlled to be a predetermined ratio. In addition, if it is determined that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the temperature inside the cooling storage room or the temperature difference between the set temperature and the outside air temperature is within a certain range. A control device is provided that controls the energization rate of the door heater so as to sequentially become lower than the predetermined ratio from a larger one to a predetermined temperature.

  The present invention can properly prevent the heat insulating door from being exposed by appropriately controlling the door heater in the cooling storage.

It is a perspective view of a refrigerator-freezer. It is a front view of the main body in the state where each door of the refrigerator-freezer was removed. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a perspective view of the main body of the refrigerator-freezer which carries out a longitudinal cross-section. It is a perspective view of a main part which shows the state before fixing a lower vertical partition after fixing an upper vertical partition and a horizontal partition to an inner box. It is a perspective view of a main part which shows the state after fixing a lower vertical partition after fixing an upper vertical partition and a horizontal partition to an inner box. It is the simplified front view of the main body of the state which put the cooler in the inner box before attaching a lower wind path formation body. It is the simplified front view of the main body for explanation of each air passage. It is the simplified front view of the main body of the state which attached the upper wind path formation body and the lower wind path formation body. It is a vertical right side view of a cooling chamber. It is a control block diagram of a refrigerator-freezer. It is a figure which shows a flowchart.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 to FIG. 6, first, a main body 2 (heat insulating box) of a refrigerator 1 as a cooling storage is separated by a steel plate outer box 3 having an opening on the front surface, and an interval in the outer box 3. And an inner box 4 made of a synthetic resin material having an opening on the front surface and a foamed polyurethane heat insulating material 5 filled and foamed between the outer box 3 and the inner box 4. Yes.

  Before filling and foaming the foamed polyurethane heat insulating material 5, as shown in FIG. 7, the upper vertical partition 8 that divides the space into left and right parts at the top of the inner box 4 and the space up and down at the left part. The horizontal partition 9 divided and partitioned is fixed to the inner box 4, and the upper vertical partition 8 and the horizontal partition 9 together with the jig disposed in the inner box 4 firmly support the inner box 4 from the inside. The foamed polyurethane heat insulating material 5 is filled and foamed between the outer box 3 and the inner box 4 in the state of supporting in this way.

  After filling the polyurethane foam heat insulating material 5, the compressor 13 and the condenser blower 14 constituting the refrigeration cycle are disposed in the machine chamber 12 at the lower back side of the main body 2, and the condenser 15 is disposed below the bottom surface of the main body 2. In the cooling chamber 10 formed by recessing the inner front surface of the inner box 4 so as to straddle the back of the lower refrigerator compartment 20 lower part and the left freezer compartment 21 lower part on the right in the vertical direction. A cooler 16 which is an evaporator is disposed.

  Then, the top air passage forming body 6 that forms the top air passage 51 with the inner box 4 and the upper air passage forming body 7 that forms the back upper air passage 50 with the inner box 4 are replaced with the inner box 4. Secure to. Further, the mounting plate 23 in which the blower 17 is disposed in the opening, and the heat insulating material 24 fixed to the mounting plate 23 so as to form a rear air passage 26 with a space in the upper portion of the mounting plate 23. And a lower air passage forming body 27 formed by integrating a front cover 25 fixed to the front surface of the heat insulating material 24 is fixed to the inner box 4, and then the lower vertical partition 28 is attached to the horizontal partition 9. It fixes to the upper vertical partition 8 and the inner box 4 through the connection air path formation body 42 which is a part (refer FIG. 8).

  That is, the lower vertical partition 28 is composed of a right frame 29, a left frame 31, and a heat insulating material 30 filled between the right frame 29 and the left frame 31, and is made of a flexible urethane foam material. The lower vertical partition body 28 is placed in the inner box 4 in a state where the U-shaped sealing material is formed around the upper surface, the rear surface and the lower surface except the front surface of the lower vertical partition body 28. Screws 75 are inserted into the mounting holes 28B provided in the upper and lower mounting pieces 28A on the upper and lower sides of the front surface of the vertical partition 28, and the lower vertical partition 28 is fixed to the upper vertical partition 8 and the inner box 4.

  In this way, the space in the inner box 4 is divided into left and right by the upper vertical partition 8 and the lower vertical partition 28 each provided with a heat insulating material, and the left space thus partitioned left and right in this way. Is divided into upper and lower parts by a horizontal partitioning body 9 provided with a heat insulating material, and is roughly divided into three parts to form a right refrigerator compartment 20, a left upper refrigerator compartment 22, and a lower left refrigerator compartment 21. .

  And the door body 35 by which the upper right lower part was rotatably supported by the front opening part of the right refrigerator compartment 20 is arrange | positioned, and the left upper and lower parts are also each in the left refrigerator compartment 22 and the freezer compartment 21 front opening part. Door bodies 36 and 37 that are rotatably supported are disposed. As shown in FIG. 5, the door body 35, which is a heat insulating door body corresponding to the right refrigerator compartment 20, has, for example, three transparent glasses 32 having an air layer therebetween, and a spacer is interposed therebetween. And a frame 33 made of aluminum that is airtight, and a handle 34 is formed at the front left end of the frame 33. A door heater 39, which is a transparent film heater that generates heat when energized, is bonded to the front surface of the middle glass 32, and the back surface of the front glass 32 is painted black.

  A defrosting heater 41 such as a glass tube heater for melting the frost attached to the cooler 16 is provided below the cooler 16 and formed on the inner front surface of the inner box 4 as shown in FIG. The cooling chamber 10 is formed so as to be recessed to substantially the same length as the thickness before and after the cooler 16, and the inner box 4 on the right side of the cooler 16 has a height substantially equal to the thickness before and after the cooler 16. The barrier wall 11 is formed so as not to enter from the right side of the cooler 4. Further, a refrigeration return air passage 45 communicating with the cooling chamber 10 from the lower right side is formed by denting the inner box 4 next to the right side shielding wall 11 of the cooler 16.

  Therefore, when the blower 17 is operated, the cool air generated by the cooler 16 rises in the cooling chamber 10, is sucked by the blower 17, passes through the blower 17, and enters the rear air passage 26. And the through-hole (damper 47 is formed in the up-down direction) through the passage 48 formed by the mounting plate 23 and the heat insulating material 24 and the connection air passage forming body 42 arranged in the right refrigerator compartment 20. 49) is led to the ascending rear upper air passage 50 and the top air passage 51 formed by the upper air passage forming body 7 and the inner box 4 (see FIG. 10). At this time, the damper 47 disposed in the connection air passage formation body 42 opens or closes the cold air circulation passage by connecting or blocking the rear air passage 26 and the rising rear upper air passage 50. Specifically, in the damper 47, the damper motor 47A is operated by a microcomputer 90 described later based on the output signal of the right refrigerator temperature sensor 80 for detecting the temperature of the right refrigerator compartment 20, and the rear air passage 26 is operated. And the rear upper air passage 50 for rising are communicated or blocked, and the cold air circulation passage is opened and closed.

  The top air passage 51 communicates with an introduction through-hole 52 formed in the upper part of the upper vertical partition 8, and the cold air is refrigerated from the top air passage 51 through the introduction through-hole 52. The blow-off communication port 53 is provided in the upper and lower intermediate positions on the left side surface of the upper vertical partition 8 by being slightly lowered in the vertical air passage 54 formed in the upper vertical partition 8 while being supplied into the chamber 22. Then, it is supplied into the left refrigerator compartment 22. Therefore, by forming the vertical air passage 54 in the upper vertical partition 8, there is no need for a special structure for forming the air passage, and the internal volume can be increased.

  Further, the cool air rising in the rear upper air passage 50 for ascending descends the lower rear air passage 55 formed in the upper air passage forming body 7 and communicates with the lower air upper air passage 55 (rear upper air flow). It is formed in the passage 55.) It is supplied into the right refrigerator compartment 20 through 56 and descends in the refrigerator compartment 20. Furthermore, it is supplied into the left refrigerator compartment 22 through the blowout communication port 53 and descends in the refrigerator compartment 22, but since there is a horizontal partitioning body 9, there is a communication facility established in the lower part of the upper vertical partitioning body 8. Is supplied into the right refrigerator compartment 20 through the through-hole 59 and descends in the refrigerator compartment 20.

  Therefore, in the right refrigeration chamber 20, food or the like placed on the placement shelf 40 having a plurality of openings supported by the support portion 38 of the lower vertical partition 28 and the support portion 63 of the inner box 4 can be refrigerated. . In addition, the through-hole 59 and the said blower outlet 56 through which the cool air of the lower left refrigerator compartment 22 passes are opened by the substantially same height level in the upper-lower positional relationship.

  For this reason, the space of the refrigerator compartment 20 below the cold air outlet 56 and the through hole 59 for communication established at the lower part of the upper vertical partition 8 is the refrigerator compartment 20 above the cold air outlet 56 and the through hole 59. The temperature in the upper space can be lowered, and the upper space is indirectly cooled by circulating cold air in the upper rear air passage 50 and the top air passage 51 without directly supplying cold air. For example, as a temperature range of about 10 ° C. to 12 ° C., cold air can be supplied to the lower space to set a normal refrigeration temperature range of about 5 ° C., for example. Accordingly, in the right refrigerator compartment 20, wine is placed on the mounting shelf 18 supported by the support portion 19 of the upper vertical partition 8 and the support portion 63 of the inner box 4 above the cold air outlet 56 and the through-hole 59. By placing it, the wine can be stored at a suitable temperature.

  Then, the cold air supplied into the right refrigerator compartment 20 descends and enters the return air passage 45 from the refrigerator compartment 20 through the outlet 60 formed in the lower air passage formation body 27, and the shielding wall. 11 from the right side of the cooler 16 so as not to enter the cooler 16, and then circulates through the defroster heater 41 disposed below the cooler 16 so as to return to the cooler 16 from below. It is burned.

  Note that the lower end of the outlet 60 is formed to be located above the lower end of the cooler 16, so that when the blower 17 is stopped, even if the cold cold air generated by the cooler 16 is lowered, the refrigeration is performed. This prevents the return air passage 45 from entering the right refrigeration chamber 20 through the outlet 60 and prevents the space in the refrigeration chamber 20 located below the cooler 16 from being overcooled. can do.

  As described above, the air is blown from the lower part of the left refrigeration room 22 into the right refrigeration room 20 through the communication through-hole 59 formed in the lower part of the upper vertical partition 8, and the inside of the right refrigeration room 20 is discharged. Since it descends and descends in the return air passage 45 from the outlet 60 located on the right outer side of the cooler 16 and returns to the cooler 16 from the bottom, the left refrigerator compartment 22 and the right refrigerator compartment The temperature difference with the storage space below 20 cold air outlets 56 can be reduced, and the temperature difference between the upper and lower sides of the left refrigerator compartment 22 can be reduced.

  Further, since the cold air is supplied from the lower part of the left refrigeration room 22 into the right refrigeration room 20 through the communication through hole 59 formed in the lower part of the upper vertical partition 8, a dedicated cold air return duct is provided. Is no longer necessary. In this case, if the temperature of the left refrigeration chamber 22 increases, the temperature of the right refrigeration chamber 20 also increases, so that no special air volume control is required, and the number of parts is reduced.

  On the other hand, the cool air rises in the cooling chamber 10, passes through the blower 17, and enters the rear air passage 26. In the lower air passage formation body 27, the thickness of the heat insulating material 24 at the back of the right refrigerator compartment 20. Then, the thickness of the heat insulating material 24 on the back side of the freezer compartment 21 is reduced, and the cold air rises and descends in the rear air passage 26 formed behind the thinned heat insulating material 24, and the lower air passage forming body. 27 is supplied into the freezer compartment 21 through a plurality of air outlets 61 formed at predetermined intervals in the air and is used for freezing (see FIG. 11). The lowermost outlet 61 is supplied into the lowermost storage container 64 through a duct 62.

  As described above, the lower air passage forming body 27 that forms the back air passage 26 is formed of the heat insulating wall body, and the thickness of the heat insulating material 24 of the lower air passage forming body 27 in front of the right refrigerator compartment 20 is set to the freezer compartment. 21 is configured to be thicker than the thickness of the heat insulating material 24 of the lower air passage forming body 27 in front of the refrigeration chamber 20 formed by dividing it into left and right by the lower vertical partition 28 and a cooler at the lower back portion across the freezing chamber 21. Even if 16 is provided, it is possible to prevent dew from being generated on the refrigerator compartment 20 side of the lower air passage formation body 27.

  The cold air supplied into the freezer compartment 21 through the plurality of air outlets 61 is stored in the storage container 64 supported by the support portion 63 formed on the side wall of the inner box 4 and the support portion 38 of the lower vertical partition 28. It is used for freezing the food in the container and descends from around the storage container 64 as indicated by an arrow, and the lowermost storage container 64 is located between the lower surface of the lowermost storage container 64 and the bottom surface of the inner box 4. This is configured to return to the cooler 16 from below via a freezing return air passage 65 through the back of the air.

  Further, as shown in FIG. 6, a water supply tank 68 in which water for ice making is stored is placed on the horizontal partition 9 of the left refrigerator compartment 22, and the water supplied from the water supply tank 68. An ice making machine 69 for making ice is provided in the upper part of the freezer compartment 21. 67 is a tank heater provided on the back side of the upper surface of the horizontal partitioning body 9 so that the water in the water supply tank 68 is not frozen. An ice storage box 66 is a container for storing ice made in the ice making machine 69.

  As described above, the defrosting heater 41 is provided below the cooler 16, and the cool air from the right refrigerator compartment 20 enters the return air passage 45 from the outlet 60 and descends and moves around. Although it is configured to return from the lower right of the cooler 16, as shown in FIG. 12, the rear lower part of the lower air passage forming body 27 in front of the defrosting heater 41 is cut out over the entire left and right direction to cool it. An air passage 70 through which the cool air returning to the vessel 16 passes is formed, and the lower air passage forming body 27 is disposed in front of the defrosting heater 41 from the rear of the air passage 70 to the defrosting heater 41 in the left-right direction. The hanging piece 71 formed integrally with the front cover 23 or separately is suspended downward.

  The hanging piece 71 is formed of a synthetic resin material, and an aluminum tape that is a heat reflecting body 72 having good heat reflectivity is attached to at least the side surface of the hanging piece 71 facing the cooler 16. Specifically, the side surface of the front cover 23 facing the cooler 16, the side surface of the drooping piece 71 facing the cooler 16, the front surface of the hanging piece 71, and the rear lower portion of the lower airflow path forming body 27 that forms the airflow path 70. The heat reflector 72 is affixed to the upper surface, the surface of the inner box 4 forming the cooling chamber 10, and the like. A dew receiving tray 73 that receives dew dripping from the cooler 16 is provided on the bottom surface of the cooling chamber 10. Not only the case where the heat reflector 72 is stuck on at least the side surface of the drooping piece 71 facing the cooler 16, a heat reflecting layer may be formed.

  Without this air passage 70, when the cooler 16 is frosted, the lower right portion of the cooler 16 is blocked with frost, and the right refrigerator compartment 20 cannot be cooled. Since the return of the cool air to 16 can be ensured reliably, the inside of the refrigerator compartment 20 can be cooled stably. Further, when the defrost heater 41 is energized for defrosting, the drooping piece 71 blocks heat from the defrost heater 41, so that upward heat convection occurs and warm air rises. Defrosting time can be shortened. Further, since the heat reflector 72 attached to the hanging piece 71 reflects heat from the defrosting heater 41, heat leakage to the right refrigerator compartment 20 and freezer compartment 21 can be reliably prevented.

  Next, in FIG. 13, reference numeral 90 denotes a CPU (central processing unit) that controls the control, a RAM (random access memory) as a storage device, a ROM (read only memory) that stores a control program, and the like. The refrigerator is integrated and controlled by a microcomputer (hereinafter referred to as “microcomputer”). The input of the microcomputer 90 detects the temperature of the right refrigerator compartment temperature sensor 80 for detecting the temperature of the right refrigerator compartment 20, the left refrigerator compartment temperature sensor 82 for detecting the temperature of the left refrigerator compartment 22, and the temperature of the freezer compartment 21. A freezer temperature sensor 81, an outside air temperature sensor 85 for detecting the outside air temperature around which the refrigerator 1 is installed, a defrosting temperature sensor 86 for detecting the temperature of the cooler 16, the refrigerating room 22 and the lower part of the refrigerating room 20 (cold air) A refrigeration temperature setting device 84A for setting the room temperature in the indoor space below the blowout port 56 and the through-hole 59, a refrigeration temperature setting device 84B for setting the room temperature of the freezer compartment 21, and the like are connected. Each set temperature set by the refrigeration temperature setting device 84A and the freezing temperature setting device 84B is stored in the RAM of the microcomputer 90.

  Further, the compressor 13 and the blower 17 are connected to the output of the microcomputer 90, a tank heater 67 provided on the back side of the upper surface of the horizontal partition 9, a defrost heater 41 provided below the cooler 16, A door heater 39 provided in the door body 35, a vertical partition side heater 87 disposed on the inner side of the right side surface of the lower vertical partition body 28, an inner side of the front surface of the lower air passage forming body 27, and the cooler 16, a wind path forming body frost-removing heater 88 disposed at the front position of 16, a lower vertical partition abutting plate heater 89 disposed inside the front surface of the lower vertical partition 28, and the connected air path forming body 42. A damper motor 47A of the damper 47 disposed in the formed through-hole 49 is connected.

  The air path forming body frosted removal heater 88 and the vertical partitioning side heater 87 both face the lower part of the refrigerator compartment 20 located below the cold air outlet 56 and the through hole 59 in order to prevent overcooling. .

  Next, based on the flowchart of FIG. 14, when the outside air temperature is high, the outside air temperature detected by the outside air temperature sensor 85 and the detected room temperature of the right refrigerator compartment 20 detected by the right refrigerator compartment temperature sensor 80. An embodiment will be described in which dew generation is prevented from occurring on the surface of the door body 35 provided with the glass 32 corresponding to the right refrigerator compartment 20 due to an increase in temperature difference. Moreover, although the right refrigerator compartment 20 is vertically long and has a certain temperature difference in the upper and lower parts, if the outside air temperature is low, the time during which the compressor 13 and the blower 17 are stopped becomes longer, and the temperature difference is more than necessary. An embodiment in which a desired temperature difference is obtained in the upper and lower portions of the right refrigerator compartment 20 will be described.

  First, the outside air temperature sensor 85 detects the outside air temperature, and the right cold room temperature sensor 80 detects the room temperature of the right cold room 20. The microcomputer 90 compares the outside air temperature output from the outside air temperature sensor 85 with the detected room temperature output of the refrigerator compartment 20 from the right refrigerator compartment temperature sensor 80, and whether or not the outside air temperature is equal to or lower than the detected room temperature of the refrigerator compartment 20. Is determined.

  When it is determined that the outside air temperature is equal to or lower than the detected room temperature of the refrigerator compartment 20, the microcomputer 90 controls the duty of the door heater 39 so that the energization rate of the door heater 39 is 70%. Return to the beginning.

  Next, when it is determined that the outside air temperature is not equal to or lower than the detected room temperature of the refrigerating room 20, that is, the outside air temperature is higher than the detected room temperature, the microcomputer 90 determines from the detected room temperature of the refrigerating room 20 from the right refrigerating room temperature sensor 80. The temperature difference is calculated by subtracting the outside air temperature.

  Then, it is determined whether or not this temperature difference is 25 ° C. or more. If the outside air temperature is high and 25 ° C. or more, the energization rate of the door heater 39 is controlled to be 60%, and the temperature difference is less than 25 ° C. If it is, it will be determined whether it is 15 degreeC or more, and if it is 15 degreeC or more, it will control so that the electricity supply rate of the door heater 39 may be 50%.

  As described above, when the outside air temperature is high, the temperature difference between the outside air temperature detected by the outside air temperature sensor 85 and the detected room temperature of the right refrigerator room 20 detected by the right refrigerator room temperature sensor 80 increases. In some cases, the surface of the door body 35 provided with the glass 32 corresponding to the refrigerating room 20 is exposed to dew. As described above, if the temperature difference is large, the energization rate of the door heater 39 is further increased. By controlling, it is possible to prevent the surface of the door body 35 from being exposed to dew.

  In addition, about the range of the temperature difference which changes the electricity supply rate of the door heater 39 for the prevention of dew condensation when the outside air temperature is high, the temperature difference is not limited to the above-described range, and the temperature difference is a finer temperature difference range. Change control may be performed so that the energization rate of the door heater 39 is sequentially reduced as the value decreases. You may control to change the electricity supply rate of the door heater 39 according to this temperature difference.

  Further, if the outside air temperature is lowered and the temperature difference obtained by subtracting the outside air temperature from the detected room temperature of the right refrigerator room 20 detected by the right refrigerator room temperature sensor 80 is further reduced, and the temperature difference is less than 15 ° C. Control is performed so that the energization rate of the door heater 39 is 70%, and the process returns to the beginning.

  As described above, when the outside air temperature is lowered and the temperature difference obtained by subtracting the outside air temperature from the detected room temperature of the right refrigerator compartment 20 is further reduced, the right refrigerator compartment 20 is vertically long and has a certain temperature in the upper and lower portions. Although there is a difference, if the outside air temperature is low, the time during which the compressor 13 and the blower 17 are stopped becomes longer, and the temperature difference between the upper and lower parts becomes larger than necessary. By raising the temperature of the right refrigerator compartment 20 and increasing the temperature of the compressor 13 and the blower 17, a desired temperature difference is obtained between the upper and lower portions of the right refrigerator compartment 20. That is, a desired temperature difference can be stably obtained above and below the cold air outlet 56 formed in the rear upper air passage 55 and the communication through-hole 59 provided in the lower part of the upper vertical partition 8. it can.

  Note that the range of the temperature difference for changing the energization rate of the door heater 39 when the outside air temperature is low is not limited to the above range, and the door heater 39 is a finer temperature difference range as the temperature difference becomes smaller. The energization rate may be changed and controlled to increase sequentially.

  Further, the above embodiment is a case where the outside air temperature is high, and the temperature difference between the outside air temperature detected by the outside air temperature sensor 85 and the detected room temperature of the right refrigerator compartment 20 detected by the right refrigerator compartment temperature sensor 80 is different. By increasing the size, the surface of the door body 35 provided with the glass 32 corresponding to the right refrigerator compartment 20 is prevented from being exposed to dew, and the right refrigerator compartment 20 is vertically long to some extent in the upper and lower parts. However, if the outside air temperature is low, the time during which the compressor 13 and the blower 17 are stopped increases, and the temperature difference becomes larger than necessary. In this embodiment, a certain desired temperature difference is obtained.

  For the same purpose as described above, in the control shown in FIG. 14 in the above embodiment, instead of “the detected room temperature of the right refrigerator compartment 20 detected by the right refrigerator compartment temperature sensor 80”, “by the refrigerator temperature setting device 84A. Control may be performed using the “set temperature of the refrigerator compartment”.

  That is, the outside air temperature sensor 85 detects the outside air temperature, and the microcomputer 90 reads the refrigerating room set temperature set by the refrigerating temperature setting device 84A, and compares the outside air temperature from the outside air temperature sensor 85 with the refrigerating room set temperature. Then, it is determined whether or not the outside air temperature is equal to or lower than the refrigerator compartment set temperature. When it is determined that the outside air temperature is equal to or lower than the set temperature of the refrigerator compartment, the microcomputer 90 controls the duty of the door heater 39 so that the energization rate of the door heater 39 is 70%, and returns to the beginning. .

  Next, when it is determined that the outside air temperature is not lower than the refrigerator compartment set temperature, that is, the outside air temperature is higher than the refrigerator compartment set temperature, the microcomputer 90 calculates the temperature difference by subtracting the outside air temperature from the refrigerator compartment set temperature. Then, it is determined whether or not this temperature difference is 25 ° C. or more. If the outside air temperature is high and 25 ° C. or more, the energization rate of the door heater 39 is controlled to be 60%, and the temperature difference is less than 25 ° C. If it is, it will be determined whether it is 15 degreeC or more, and if it is 15 degreeC or more, it will control so that the electricity supply rate of the door heater 39 may be 50%.

  As described above, when the outside air temperature is high, the temperature difference between the outside air temperature detected by the outside air temperature sensor 85 and the refrigerating room set temperature increases, so that the door body including the glass 32 corresponding to the right refrigerating room 20 is obtained. In some cases, the surface of the door 35 is exposed to dew. As described above, if the temperature difference is large, the surface of the door body 35 is exposed to dew by controlling the energization rate of the door heater 39 to be higher. It can be prevented from occurring.

  Further, the temperature difference obtained by subtracting the outside air temperature from the refrigerating room set temperature is further reduced when the outside air temperature is lowered, and if the temperature difference is less than 15 ° C., the energization rate of the door heater 39 is controlled to be 70%. And return to the beginning. As described above, when the outside air temperature is lowered and the temperature difference obtained by subtracting the outside air temperature from the refrigerating room set temperature is further reduced, the right refrigerating room 20 is vertically long and has a certain temperature difference between the upper and lower parts. However, when the outside air temperature is low, the time for which the compressor 13 and the blower 17 are stopped becomes longer, and the temperature difference between the upper and lower parts becomes larger than necessary. Therefore, by increasing the energization rate of the door heater 39, By raising the room temperature of the right refrigerator compartment 20 and operating the compressor 13 and the blower 17, a desired temperature difference is obtained in the upper and lower portions of the right refrigerator compartment 20. That is, a desired temperature difference can be stably obtained above and below the cold air outlet 56 formed in the rear upper air passage 55 and the communication through-hole 59 provided in the lower part of the upper vertical partition 8. it can.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description, and the present invention is not limited to the various embodiments described above without departing from the spirit of the present invention. It encompasses alternatives, modifications or variations.

DESCRIPTION OF SYMBOLS 1 Refrigeration refrigerator 2 Main body 4 Inner box 16 Cooler 17 Blower 20 Refrigeration room 35 Door body 39 Door heater 80 Right refrigeration room temperature sensor 84A Refrigeration temperature setting device 84B Refrigeration temperature setting device 84 Temperature setting device 85 Outside temperature sensor 90 Microcomputer

Claims (4)

In the control method of the door heater in the cooling storehouse in which the door heater is provided on the heat insulating door that opens and closes the front opening of the cooling storage chamber configured by fitting glass into the frame,
The determination device determines whether or not the outside air temperature detected by the outside air temperature sensor is equal to or lower than the cooling storage chamber temperature detected by the cooling storage chamber temperature sensor, or whether it is equal to or lower than the set temperature of the cooling storage chamber set by the temperature setting device. ,
When the determination device determines that the outside air temperature is equal to or lower than the cooling storage chamber temperature or equal to or lower than the set temperature, the power supply rate of the door heater disposed on the heat insulating door is set to a predetermined ratio. Control
When the determination device determines that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the control device determines the temperature in the cooling storage room or the temperature difference between the set temperature and the outside air temperature. A control method for a door heater in a cooling storage, wherein the energization rate of the door heater is controlled to be sequentially lower than the predetermined ratio within a certain temperature difference range. In the control method of the door heater in the cooling storehouse in which the door heater is provided on the heat insulating door that opens and closes the front opening of the cooling storage chamber configured by fitting glass into the frame,
The determination device determines whether or not the outside air temperature detected by the outside air temperature sensor is equal to or lower than the cooling storage chamber temperature detected by the cooling storage chamber temperature sensor, or whether it is equal to or lower than the set temperature of the cooling storage chamber set by the temperature setting device. ,
When the determination device determines that the outside air temperature is equal to or lower than the cooling storage chamber temperature or the set temperature, the control device determines that the energization rate of the door heater disposed on the heat insulating door is a predetermined ratio. Control to be
When the determination device determines that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the control device is responsive to the cooling storage room temperature or the temperature difference between the set temperature and the outside air temperature. A control method for a door heater in a cooling storage, wherein the energization rate of the door heater is controlled to be sequentially lower than the predetermined ratio from a larger one to a predetermined temperature within a temperature difference range. In the control device for the door heater in the cooling storehouse in which the door heater is provided on the heat insulating door that opens and closes the front opening of the cooling storage chamber configured by fitting glass into the frame,
A temperature setting device for setting an indoor temperature of the cooling storage room;
An outside temperature sensor for detecting the outside temperature;
A cooling storage chamber temperature sensor for detecting an indoor temperature of the cooling storage chamber;
A determination device for determining whether the outside air temperature detected by the outside air temperature sensor is equal to or lower than a cooling storage chamber temperature detected by a cooling storage chamber temperature sensor, or whether it is equal to or lower than a set temperature set by the temperature setting device;
When this determination device determines that the outside air temperature is equal to or lower than the temperature in the cooling storage room or equal to or lower than the set temperature, the energization rate of the door heater disposed in the heat insulating door is controlled to be a predetermined ratio. At the same time, if it is determined that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the temperature in the cooling storage room or within a temperature difference range corresponding to the difference between the set temperature and the outside air temperature A control device for a door heater in a cooling storage, comprising a control device for controlling the energization rate of the door heater to be sequentially lower than the predetermined ratio. In the control device for the door heater in the cooling storehouse in which the door heater is provided on the heat insulating door that opens and closes the front opening of the cooling storage chamber configured by fitting glass into the frame,
A temperature setting device for setting an indoor temperature of the cooling storage room;
An outside temperature sensor for detecting the outside temperature;
A cooling storage chamber temperature sensor for detecting an indoor temperature of the cooling storage chamber;
A determination device for determining whether the outside air temperature detected by the outside air temperature sensor is equal to or lower than a cooling storage chamber temperature detected by a cooling storage chamber temperature sensor, or whether it is equal to or lower than a set temperature set by the temperature setting device;
When this determination device determines that the outside air temperature is equal to or lower than the temperature in the cooling storage room or equal to or lower than the set temperature, the energization rate of the door heater disposed in the heat insulating door is controlled to be a predetermined ratio. In addition, if it is determined that the outside air temperature is not lower than the cooling storage room temperature or not lower than the set temperature, the temperature inside the cooling storage room or the temperature difference between the set temperature and the outside air temperature is within a certain range. A control device for a door heater in a cooling storage, comprising a control device for controlling the energization rate of the door heater to be successively lower than the predetermined ratio from a larger one to a predetermined temperature.

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