JP2014119170A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve energy-saving performance of a refrigerator including heating means in a partition part.SOLUTION: A refrigerator includes: a heat insulation box body in which an opening is formed forward; a first door opening and closing the opening; and a second door adjacent to the first door and, opening and closing the opening; a partition part provided in one of the first door and the second door, and positioned at the boundary part between the first door and the second door; heating means heating the partition part to suppress the occurrence of dew condensation; detection means detecting the temperature and humidity of the ambient air of the heat insulation box body; and control means controlling the heating amount of the heating means. The heating means is controlled so that the time average value of the surface temperature of the rotary partition part becomes a dew point temperature or less.

Description

  The present invention relates to a refrigerator.

  As a background art of this technical field, there is Japanese Patent No. 4945395 (Patent Document 1).

  Patent Document 1 includes a dew-proof heater that suppresses the occurrence of condensation, an outside air temperature sensor that detects an outside air temperature around the refrigerator, and a control unit that controls the amount of heat generated by the dew-proof heater. The control means adjusts the heat generation amount of the dew-proof heater according to the outside air temperature, and the heat generation has a heat generation amount lower than that of the normal heat generation mode and condensation occurs in an atmosphere of a predetermined outside air temperature and a predetermined humidity. A low heat generation mode for setting an amount, and the operation means can switch between the normal heat generation mode and the low heat generation mode, and continues for a predetermined time or more during the execution of the low heat generation mode. A technique for shifting from the low heat generation mode to the normal heat generation mode when an outside air temperature is detected is disclosed.

Japanese Patent No. 4945395

  However, the technique described in Patent Document 1 has a low heat generation mode for setting a heat generation amount at which condensation occurs, and the low heat generation mode shifts to a normal heat generation mode by satisfying a certain return condition. When the condition is not satisfied, the low heat generation mode is continuously maintained, so that condensation occurs.

  This invention is made | formed in view of the said subject, and it aims at improving the energy-saving performance of the refrigerator provided with the heating means in the partition part more.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. To give an example, a heat insulating box having an opening formed in the front, a first door for opening and closing the opening, and the first door And a second door that opens and closes the opening, and a partition that is provided at one of the first door and the second door and is located at the boundary between the first door and the second door Heating means for heating the partition portion to suppress the occurrence of condensation, detection means for detecting the temperature and humidity of the ambient air around the heat insulating box, and control means for controlling the heating amount of the heating means. And the heating means is controlled so that the time average value of the surface temperature of the rotating partition is equal to or lower than the dew point temperature.

  ADVANTAGE OF THE INVENTION According to this invention, the energy saving performance of the refrigerator provided with the heating means in the partition part can be improved more.

The front external view of the refrigerator which concerns on embodiment of this invention. AA sectional drawing of the refrigerator shown in FIG. BB sectional drawing of the refrigerator shown in FIG. The principal part expansion explanatory drawing of the refrigerator shown in FIG. CC sectional drawing of the refrigerator shown in FIG. The flowchart showing control of the refrigerator which concerns on embodiment of this invention. The time chart showing the control and temperature change of the refrigerator which concerns on embodiment of this invention. The schematic diagram showing the water vapor | steam movement between the door gaps of the refrigerator which concerns on embodiment of this invention. The figure showing the temperature change of the partition part of the refrigerator which concerns on embodiment of this invention. The figure showing the relationship between the minimum attainment temperature of the rotation partition surface of the refrigerator which concerns on embodiment of this invention, dew-proof heater OFF time, and a dew condensation state.

  An embodiment of a refrigerator according to the present invention will be described with reference to FIGS.

  FIG. 1 is a front outline view of the refrigerator of the present embodiment. FIG. 2 is a cross-sectional view of the refrigerator shown in FIG. FIG. 3 is a BB cross-sectional view of the refrigerator shown in FIG.

  As shown in FIG. 2, the refrigerator 1 of the present embodiment includes a refrigerator compartment 2, an upper freezer compartment 3, a lower freezer compartment 4, and a vegetable compartment 5 from above. The refrigerated room 2 and the vegetable room 5 are storage rooms in a refrigerated temperature zone of about 3 to 5 ° C. The upper freezer compartment 3 and the lower freezer compartment 4 are storage rooms in a freezing temperature zone of approximately −18 ° C.

  The refrigerator compartment 2 is provided with double door-type refrigerator compartment doors 6 and 7 divided into left and right on the front side. The upper freezer compartment 3, the lower freezer compartment 4, and the vegetable compartment 5 are each provided with a drawer-type upper freezer compartment door 8, a lower freezer compartment door 9, and a vegetable compartment door 10. Further, packings 17 and 18 (seal members) (see FIG. 3) are provided on the surface of each door on the storage chamber side along the outer edge of each door. When each door is closed, the outside air into the storage chamber is provided. Intrusion of air and cold air leakage from the storage room are suppressed.

  Moreover, the refrigerator 1 of this embodiment has a door sensor (not shown) that detects the open / closed state of the door provided in each storage room, and a state in which each door is determined to be open for a predetermined time, for example, An alarm (not shown) for notifying the user when the operation is continued for one minute or more, a temperature setting device for setting the temperature of the refrigerator compartment 2, the temperature of the upper freezer compartment 3 and the lower freezer compartment 4, etc. Not shown).

  Reference numeral 11 denotes a cooler chamber. The cooler chamber 11 includes a cooler 12 that constitutes a refrigeration cycle, a cooling fan 13 that forcibly circulates cold air cooled by the cooler 12 to the refrigerator compartment 2, the freezer compartments 3, 4, and the like. Is provided.

  Reference numerals 14 and 15 denote fixed partitions. In the refrigerator 1 of the present embodiment, the refrigerator compartment 2 and the upper freezer compartment 3 (see FIG. 2) are separated by the upper heat insulating partition wall 14 through the heat insulating wall, and the lower heat insulating wall. The partition wall 15 separates the lower freezer compartment 4 and the vegetable compartment 5 from each other in an adiabatic manner. Thereby, each chamber is maintained at a predetermined temperature.

  16 is a rotation partition (partition part). The rotary partition 16 constitutes a packing receiving surface for a double door (right refrigerator door 6 and left refrigerator door 7) provided to close the front opening of the refrigerator compartment 2. Further, the rotary partition 16 is attached to the left refrigerator compartment door 7. And the rotation partition 7 rotates from the position of a continuous line to the position of a broken line as FIG. 3 by the guide member (not shown) provided in the refrigerator main body 1 side which comprises the refrigerator compartment 2. As shown in FIG. Thereby, the rotation partition 16 comprises the receiving surface of the packings 17 and 18 (seal member) provided in the right refrigerator compartment door 6 and the left refrigerator compartment door 7, respectively. Further, unlike the fixed partition, the rotary partition 16 is formed with a thin heat insulating wall as shown in FIG. This is also for reducing the gap width dimension (W in FIG. 3) of the front door of the rotary partition 16, that is, the right refrigerator door 6 and the left refrigerator door 7, and in the refrigerator 1 of the present embodiment, the rotary partition. The gap width dimension W = 6 mm between the doors in front of the part. Moreover, the clearance depth dimension (D in FIG. 3) from the door front edge to the surface of the rotating partition is set to be three times or more of W, and the refrigerator 1 of the present embodiment has D = 60 mm.

  Furthermore, L1 dimension (refer FIG. 4) of the rotation partition 16 is comprised shorter than the height dimension L2 of the refrigerator compartment 2 for the structure rotated within the refrigerator compartment 2. As shown in FIG. For this reason, between the rotation partition 16 and the inner box 30 which comprises the refrigerator compartment 2, the clearance gap 21 for L2-L1 is made up and down. 19 and 20 are fin packings (fin-like seal members) integrally formed at the upper and lower ends of the packings 17 and 18. As shown in FIG. 4, the fin packings 19 and 20 are provided to close a gap 21 formed by L 2 -L 1.

  Next, referring to FIG. 5, the rotary partition 16 will be described in more detail. In the figure, 16 is a rotation partition, and this rotation partition 16 is comprised by the box 22 formed with resin, the partition iron plate 23 (seal member receiving surface iron plate), the heat insulating material 24, the dew-proof heater 25, etc. FIG. . And the box 22 and the partition iron plate 23 are made so that the thickness (T dimension) of the rotation partition 16 may be 20 mm-about 30 mm.

  Moreover, the partition iron plate 23 is made of a thin steel plate having a thickness of about 0.4 to 1.0 mm. Usually, this partitioning iron plate 23 is made by applying a coating after it is configured with a press machine or the like. The reason why the partition iron plate 23 is made of an iron plate is that it serves as a receiving surface for the packings 17 and 18 incorporating a permanent magnet.

  On the back side of the partition iron plate 23, a dew proof heater 25 (heating means) composed of a cord heater 25a and an aluminum foil 25b is disposed. This prevents the surface of the product from condensing.

  The refrigerator 1 includes an outside air temperature sensor 26 and an outside air humidity sensor 27 which are detection means for detecting the temperature and humidity (outside air temperature, outside air humidity) of the installed ambient environment.

  As a control device, a control board 28 on which a CPU, a memory such as a ROM and a RAM, an interface circuit, and the like are mounted is arranged on the upper surface side of the refrigerator 1 (see FIG. 2). The control board 28 includes the outside temperature sensor 26, the outside humidity sensor 27, a door sensor that detects the open / closed state of each storage compartment door, a temperature setter provided in the left refrigerator door 7, a power saving mode setter, etc. Connect with. The dew-proof heater ON / OFF control and the like are performed by a program previously installed in the ROM.

Next, control of the refrigerator 1 of this embodiment is demonstrated, referring FIG. 6, FIG.
FIG. 6 is a control flowchart of ON / OFF control of the dew proof heater of the refrigerator 1 according to the present embodiment. FIG. 7 is a surface temperature of the rotating partition when the dew proof heater ON / OFF control of the refrigerator 1 according to the present embodiment is performed. It is a time chart showing the change of and a control state. The control is performed by the control device, that is, the CPU of the control board 28 (see FIG. 2) executing a program stored in the ROM.

  Based on information detected by the power-saving mode setting unit, the outside air temperature sensor 36, and the outside air humidity sensor 37 provided in the left refrigerator compartment door 7, the ON / OFF control mode and heater ON / OFF time of the dew-proof heater are determined. In the refrigerator 1 of the present embodiment, when the “power saving mode is OFF” or “the power saving mode is ON” and “the outside air humidity is equal to or higher than the predetermined humidity”, the condition of the mode i of the dew-proof heater ON / OFF control is satisfied. To do. Note that ON / OFF of the power saving mode is set by a power saving mode setting device provided in the left refrigerator compartment door 7. On the other hand, when the “power saving mode is ON” and “the outside air humidity is equal to or lower than the predetermined humidity”, the condition of the mode ii of the dew-proof heater ON / OFF control is satisfied.

  Mode i is a control mode in which the time average temperature on the surface of the rotating partition during stable operation is equal to or higher than the dew point temperature, and mode ii is the time average temperature on the surface of the rotating partition during stable operation equal to or lower than the dew point temperature. The user can set the control mode using the power saving mode setting device. Details will be described later.

  The condition for shifting to the control of mode i is “power saving mode OFF” or “power saving mode ON” and “the outside air humidity is equal to or higher than the predetermined humidity”. When the person sets the power saving mode and the humidity detected by the outside air humidity sensor 37 is equal to or higher than the predetermined humidity, the mode i is set. In the refrigerator 1 of the present embodiment, when the user does not set the power saving mode by the power saving mode setting device provided in the left refrigerator compartment door 7 or is set to the power saving mode and detected by the outside air humidity sensor 37. Mode i is selected when the humidity is 80% or more.

  On the other hand, the conditions for shifting to the control of mode ii are “power saving mode ON” and “the outside air humidity is equal to or lower than the predetermined humidity”, so the humidity set by the user and detected by the outside air humidity sensor 37 is set. When is below a predetermined humidity, mode ii is entered. In the refrigerator 1 of the present embodiment, when the user sets the power saving mode with the power saving mode setting device provided on the left refrigerator compartment door 7 and the humidity detected by the outside air humidity sensor 37 is 80% or less. Mode ii is entered.

  In the mode i, t1 is a time for turning on the dew-proof heater 25 and heating the heater, and t2 is a time for turning off the dew-proof heater 25 and not heating the heater. t1 and t2 are calculated based on the temperature and humidity detected by the outside air temperature sensor 36 and the outside air humidity sensor 37. The lower the temperature and humidity, the longer the ratio of t2 relative to the aforementioned t1. For example, in the refrigerator 1 of the present embodiment, in the case of mode i at an outside air temperature of 30 ° C. and an outside air humidity of 70%, t1 = 21 minutes and t2 = 9 minutes, and when the outside air temperature is 15 ° C. and the outside air humidity is 55%, t1 = 9 minutes and t2 = 21 minutes.

  On the other hand, t3 in mode ii is the time for heating the heater by turning on the dew-proof heater 25, similarly to t1, and t4 is the time for turning off the dew-proof heater 25 and not heating the heater, similar to t2. t3 and t4 are also calculated based on the temperature and humidity detected by the outside air temperature sensor 36 and the outside air humidity sensor 37. The lower the temperature and humidity, the longer the ratio of t4 to the above-mentioned t3. In addition, under the conditions of the same temperature and the same humidity, the ON rate of mode i is set to be larger than the ON rate of mode ii. That is, t1 / (t1 + t2)> t3 / (t3 + t4) is established. For example, in the refrigerator 1 of this embodiment, when the outside air temperature is 30 ° C. and the outside air humidity is 70% and the mode ii, t1 = 18 minutes and t2 = 12 minutes, and when the outside air temperature is 15 ° C. and the outside air humidity is 55%, t1 = 2 minutes and t2 = 28 minutes.

  When the refrigerator 1 of the present embodiment is installed in an environment with a temperature of 30 ° C. and a relative humidity of 70% and is in a stable operation state (details conform to JIS C9801: 2006), the surface of the rotating partition 16 (the surface of the partition iron plate 23) ) And the control state of the dew proof heater will be described with reference to FIG. The stable operation state refers to a state in which there is no load fluctuation factor such as outside temperature fluctuation or door opening / closing, and the storage chamber is stably cooled to a substantially constant temperature range.

  As shown in FIG. 7, during mode i, the dew proof heater 25 is OFF at the elapsed time ta, the temperature of the rotating partition iron plate 23 decreases, and the dew point temperature based on the outside air temperature humidity (23.9 here). ℃ is below the dew point temperature).

  Since the dew proof heater 25 is switched from OFF to ON at the elapsed time ta, the surface of the rotating partition iron plate 23 is heated, the surface temperature of the rotating partition iron plate rises, and reaches the dew point temperature at the elapsed time tb. In mode i, the heater is switched from ON to OFF when the heater ON time reaches a predetermined time t1 (= 21 minutes). Here, it switches from ON to OFF at the elapsed time tc.

  When the heater is switched from ON to OFF, the surface of the rotating partition iron plate 23 is not heated, the surface temperature of the rotating partition iron plate decreases, and reaches the dew point temperature at the elapsed time td. In mode i, when the heater OFF time reaches a predetermined time t2 (= 9 minutes), the heater is switched from OFF to ON. Here, the switch is made from OFF to ON at the elapsed time te. Thereafter, the same control is performed in the stable state. As shown in FIG. 7, in mode i, the rotating partition surface temperature (time average) in the stable operation state is equal to or higher than the dew point temperature, and is controlled to 25 ° C. (dew point temperature 23.9 ° C.) in the refrigerator 1 of the present embodiment. Has been.

  On the other hand, as shown in FIG. 7, during mode ii, at the elapsed time tf, the dew proof heater 25 is OFF, the temperature of the rotating partition iron plate 23 decreases, and the dew point temperature based on the outside air temperature humidity (here, 23 It is in a state where .9 ° C is lower than the dew point temperature.

  Since the dewproof heater 25 is switched from OFF to ON at the elapsed time tf, the surface of the rotating partition iron plate 23 is heated, the surface temperature of the rotating partition iron plate rises, and reaches the dew point temperature at the elapsed time tg. In mode ii, when the heater ON time reaches a predetermined time t3 (= 18 minutes), the heater is switched from ON to OFF. Here, it is switched from ON to OFF at the elapsed time th.

  When the heater is switched from ON to OFF, the surface of the rotating partition iron plate 23 is not heated, the surface temperature of the rotating partition iron plate decreases, and reaches the dew point temperature at the elapsed time ti. In mode ii, when the heater OFF time reaches a predetermined time t4 (= 12 minutes), the heater is switched from OFF to ON. Here, it switches from OFF to ON at the elapsed time tj. Thereafter, the same control is performed in the stable state. As shown in FIG. 7, in mode ii, the surface temperature (time average) of the rotating partition in the stable operation state is below the dew point temperature, and is controlled to 23 ° C. (dew point temperature of 23.9 ° C.) in the refrigerator 1 of the present embodiment. Has been.

  Although the structure of the refrigerator of this embodiment and the control method were demonstrated above, the effect which the refrigerator of this embodiment shows next is demonstrated.

  The refrigerator 1 according to the present embodiment includes a double door type right refrigerator compartment door 6 and a left refrigerator compartment door 7 which are divided into left and right on the front side of the refrigerator compartment 2, and a rotating partition 16 is disposed on the left refrigerator compartment door. A dew-proof heater 25 for heating the surface of the partition iron plate 23 is provided in the rotating partition, and the time average value of the surface temperature of the rotating partition portion in a stable operation state is controlled by controlling the heating amount of the dew-proof heater. The dew point is below the temperature and humidity. That is, a heat insulating box having an opening formed in the front, a first door for opening and closing the storage chamber, a second door for opening and closing the storage chamber adjacent to the first door, and the two doors In the refrigerator equipped with a double door that is rotated by a guide member provided on the main body side of the rotary partition provided on one of the doors and forms a packing receiving surface of the other door, A dew-proof heater that suppresses the occurrence of dew condensation; and a detection unit that detects the temperature and humidity of the ambient air around the heat insulation box; and a control unit that controls a heating amount of the dew-proof heater; The dew proof heater is controlled such that the time average value of the surface temperature is equal to or lower than the dew point temperature. Thereby, the calorie | heat amount which flows in in a store | warehouse | chamber from the rotation partition part surface can be suppressed, and the energy saving performance of a refrigerator can be improved more.

  The refrigerator 1 according to the present embodiment includes a double door type right refrigerator compartment door 6 and a left refrigerator compartment door 7 which are divided into left and right on the front side of the refrigerator compartment 2, and a rotating partition 16 is disposed on the left refrigerator compartment door. A dew-proof heater 25 for heating the surface of the partition iron plate 23 is provided in the rotating partition, and the time average value of the surface temperature of the rotating partition portion in a stable operation state is controlled by controlling the heating amount of the dew-proof heater. The dew point is below the temperature and humidity. That is, a heat insulating box having an opening formed in the front, a first door for opening and closing the storage chamber, a second door for opening and closing the storage chamber adjacent to the first door, and the two doors In the refrigerator equipped with a double door that is rotated by a guide member provided on the main body side of the rotary partition provided on one of the doors and forms a packing receiving surface of the other door, A dew-proof heater that suppresses the occurrence of dew condensation; and a detection unit that detects the temperature and humidity of the ambient air around the heat insulation box; and a control unit that controls a heating amount of the dew-proof heater; The heating means is controlled so that the time during which the surface temperature becomes the dew point temperature or less is longer than the time when the surface temperature becomes the dew point temperature or more. Thereby, the calorie | heat amount which flows in in a store | warehouse | chamber from the rotation partition part surface can be suppressed, and the energy saving performance of a refrigerator can be improved more.

  In the refrigerator 1 of the present embodiment, the gap depth dimension (D in FIG. 3) from the front edge of the door to the surface of the rotary partition is larger than the gap width dimension (W in FIG. 3) between the doors in front of the rotary partition. I try to get bigger. Thereby, it can be set as the refrigerator in which dew condensation does not grow easily, improving energy-saving performance by making a rotation partition part below dew point temperature. The reason will be explained below.

  Condensation is a phenomenon in which water vapor in the outside air condenses by moving to the wall surface below the dew point temperature by convection and diffusion (mass transfer phenomenon), but especially when convection occurs near the wall surface below the dew point temperature, The nearby water vapor concentration gradient (water vapor partial pressure gradient) becomes steep, and mass transfer occurs actively. Therefore, when convection occurs, condensation grows on the wall surface below the dew point temperature in a short time and reaches a level where it flows down. Natural convection caused by density difference has a relatively small degree of mass transfer promotion.For example, when a person passes in front of a refrigerator, forced convection, that is, a flow induced by forced convection in front of the door gap. If this occurs in the gap, mass transfer is promoted, and condensation may grow in a short time.

  Therefore, in the refrigerator 1 of the present embodiment, the rotation partition portion temperature is set to be equal to or lower than the dew point temperature so that the gap depth dimension from the door front edge to the surface of the rotation partition portion is larger than the gap width dimension between the doors. However, the influence of forced convection generated in front of the door can be suppressed sufficiently small. As a result, it is possible to maintain a state in which condensation does not easily grow.

  The refrigerator 1 of this embodiment sets the gap width dimension (W in FIG. 3) between the doors in front of the rotary partition 16 to 10 mm or less, and the gap depth dimension from the door front edge to the rotary partition surface (D in FIG. 3). Is secured at least three times the gap width dimension. Natural convection also contributes to the promotion of mass transfer, although the degree of influence is small compared to forced convection. Since natural convection hardly occurs in a narrow space, by setting the gap width dimension between the doors to 10 mm or less, it can be suppressed to a sufficiently small size, and further, by ensuring a gap depth dimension that is three times or more the gap width dimension, The influence of forced convection generated in front of the door can also be suppressed sufficiently small. Thereby, the movement of water vapor is mainly due to diffusion, and the mass movement is suppressed to be sufficiently smaller than that in the case where convection occurs. Therefore, even if the rotating partition is set to a dew point temperature or lower, a refrigerator in which condensation is less likely to grow can be obtained.

  The refrigerator 1 of the present embodiment controls the heating amount of the dew proof heater disposed in the rotating partition, and alternately turns the surface temperature of the rotating partition portion above the dew point temperature of the outside air temperature humidity and below the dew point temperature. As described above, the time average temperature of the rotating partition is controlled to be equal to or lower than the dew point temperature. Thereby, even if it makes a rotation partition part below dew point temperature, it can be set as the refrigerator with which condensation does not grow easily. The reason will be described below with reference to FIG.

  FIG. 8A is a schematic diagram showing a state in which water vapor diffuses through the gap between the doors when the surface temperature of the rotating partition is equal to or lower than the dew point temperature, and FIG. It is a schematic diagram showing a mode that water vapor | steam spread | diffuses the clearance gap between doors when it becomes more than dew point temperature. As shown in FIG. 8A, when the surface temperature of the rotating partition is lowered to the dew point temperature or less, the water vapor in the vicinity of the surface of the rotating partition is condensed and minute water droplets are generated on the surface of the rotating partition. At this time, the vicinity of the surface of the rotating partition becomes the saturated water vapor partial pressure Pw based on the temperature of the surface of the rotating partition, and a gradient with respect to the water vapor partial pressure based on the outside air humidity is formed. The difference in the water vapor partial pressure Pw becomes the driving force for the diffusion of water vapor molecules. On the other hand, since the total pressure P (= Pw + Pa) in the gap between the doors is kept constant, the partial pressure Pa of air increases by the amount by which the water vapor partial pressure Pw decreases.

  Therefore, the air acts so as to prevent the diffusion of water vapor toward the surface of the rotating partition portion because the pressure gradient is opposite to that of the water vapor and diffuses outward. As a result, even if minute water droplets are generated at the initial stage, the subsequent movement of water vapor is hindered by air and the diffusion resistance of water vapor increases, so that condensation grows even if the surface temperature of the rotating partition is below the dew point temperature. It becomes difficult to do.

  Next, when heated from the state of FIG. 8 (a) to a temperature equal to or higher than the dew point temperature shown in FIG. 8 (b), the surface of the rotating partition is saturated because there are minute water droplets. The water vapor partial pressure Pw is a pressure based on the surface temperature of the rotating partition portion. Even if the surface temperature is slightly higher than the dew point temperature, it is higher than the partial pressure Pw of the outside air, and furthermore, the diffusion direction of the water vapor is promoted because the air diffusion direction and the water vapor diffusion direction coincide. (The diffusion resistance of water vapor is reduced).

  Therefore, by controlling the heating amount of the dew proof heater arranged in the rotating partition, the rotating partition surface temperature is alternately repeated between a state above the dew point temperature of the outside air temperature humidity and a state below the dew point temperature, If the time average temperature of the rotating partition is controlled below the dew point temperature, if the temperature falls below the dew point temperature, the diffusion resistance increases, making it difficult for condensation to grow.If the temperature exceeds the dew point temperature, the diffusion resistance is reduced. By reducing the water vapor to the outside of the warehouse will be actively performed, even though the time average temperature of the rotating partition is controlled below the dew point temperature, energy saving performance is sufficiently enhanced, The refrigerator can be substantially free from the growth of condensation.

  In addition, in the refrigerator 1 of this embodiment, the timing of the switching control for making the time average value of the rotation partition part surface temperature in a stable operation state below the dew point temperature with respect to external temperature humidity is determined by time.

  The refrigerator 1 of the present embodiment includes a dew-proof heater on the surface of the rotating partition that can adjust the heating amount, and a heat insulating material is disposed on the back side of the dew-proof heater so that the heating amount is large, that is, the heater is turned on. The temperature of the surface of the rotating partition is controlled by alternately switching the state where the time is long and the state where the heating amount is small, that is, the state where the heater ON time is short, before reaching the steady state. Thereby, the calorie | heat amount which flows in in a store | warehouse | chamber by the heating of a dewproof heater can be suppressed. The reason will be described with reference to FIG. 9 and FIG. 3 as appropriate.

FIG. 9 is a diagram showing the temperature change of the surface of the rotating partition and the surface in contact with the interior (see FIG. 3 for the surface position). At t _A in FIG. 9, the temperature of both the surface of the rotary partition and the surface in contact with the interior is low. Subsequently, the surface temperature of the rotating partition is quickly increased by setting the heating state by the dew proof heater 25 which is a heating means. At this time, the temperature of the surface in contact with the inside of the rotary partition is gradually increased due to the heat capacity of the heat insulating material 24 disposed on the back side. Next, at t _B , the dew-proof heater 25 is not energized and switched to the non-heated state before the temperature of the surface in contact with the interior of the rotating partition reaches the steady state. Thereby, even if the temperature of the part near the dew-proof heater 25 of the heat insulating material 24 is increased, the vicinity of the surface in contact with the inside of the rotary partition is not sufficiently increased. From t _B to t _C is a non-heated state, and in the non-heated state, the heat insulating material 24 is cooled from the surface in contact with the inside of the rotary partition, and the temperature of the rotary partition is gradually lowered. . As described above, by switching from the heated state to the non-heated state before the temperature of the surface contacting the inside of the rotating partition reaches the steady state, the surface contacting the inside of the rotating partition is kept at a relatively low temperature. When the surface of the rotating partition is heated, the amount of heat flowing into the cabinet can be suppressed, and a refrigerator with high energy saving performance can be obtained. Moreover, since the temperature drop on the surface of the rotating partition is moderated by the heat insulating material 24, the refrigerator is less likely to cause dew condensation even if the non-heated state is longer than the heated state.

  The refrigerator 1 of the present embodiment includes a control mode (mode i) in which the time average temperature on the surface of the rotating partition in a stable operation state is equal to or higher than the dew point temperature, and a control mode (mode ii) that is equal to or lower than the dew point temperature. The mode can be selected by mode setting means. As a result, it is possible to select control that further improves energy saving performance even under the same temperature and humidity environment.For example, during times when there is a concern about shortage of power supply, energy consumption can be reduced by reducing power consumption. It is possible to select a mode with improved performance. Furthermore, when it is desired to improve the energy saving performance after correctly understanding the effects of the mode ii of the refrigerator 1 of the present embodiment, which is a mode with high energy saving performance, and the risk of condensation, by enabling the user to set Will be able to use.

  In the refrigerator 1 of the present embodiment, the dew-proof heater OFF time in mode i and mode ii is 9 minutes and 12 minutes, respectively. As a result, when the temperature is lower than the dew point temperature, a situation in which condensation occurs on the surface of the rotating partition portion, but a flow down is avoided, so that both energy saving performance and reliability can be achieved. The reason will be described with reference to FIG. 10 and FIG. 3 as appropriate.

  FIG. 10 is a diagram illustrating the relationship between the minimum temperature reached on the surface of the rotating partition, the dew-proof heater OFF time, and the dew condensation state. The vertical axis in FIG. 10 is the lowest temperature reached on the rotating partition surface (the surface of the partition iron plate 23), and the horizontal axis is the OFF time of the dew-proof heater 25.

  (A) in FIG. 10 represents a range in which the minimum temperature reached on the surface of the rotating partition is equal to or higher than the dew point temperature, and no condensation occurs on the surface of the rotating partition regardless of the OFF time of the dew prevention heater 25. Next, the range indicated by (B) in FIG. 10 represents a range in which condensation occurs because the lowest temperature reached on the surface of the rotating partition is lower than the dew point temperature, but condensation is retained on the surface of the rotating partition and does not flow down. . Further, a range indicated by (C) in FIG. 10 represents a range in which the lowest temperature reached on the surface of the rotating partition is equal to or lower than the dew point temperature and dew condensation flows down. As shown in FIG. 10, the lower the minimum temperature reached on the surface of the rotating partition, the easier it is for the condensation to flow down in a shorter time, and even if the minimum reached temperature on the surface of the rotating partition is less than the dew point, the dew prevention heater 25 is turned off. It can be seen that the longer the time, the easier it is for the condensation to flow down. Therefore, by causing the relationship between the minimum temperature reached on the surface of the rotating partition and the OFF time of the dew-proof heater 25 to fall within the range shown in FIG. Can be avoided, and both energy saving performance and reliability can be achieved. In the refrigerator 1 of the present embodiment, the dew prevention heater OFF time in the mode i and the mode ii is set to 9 minutes and 12 minutes, respectively, so that it falls within the range shown in FIG. It is a refrigerator that can achieve both reliability and reliability.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications are included. For example, the outside air temperature sensor 26 and the outside air humidity sensor 27 may be installed anywhere as long as the outside air temperature and humidity can be detected. In the refrigerator of the present embodiment, the ON time (t1, t3) of the dew proof heater 25 at which the rotating partition surface temperature becomes a predetermined average temperature based on the temperature and humidity detected by the outside air temperature sensor 36 and the outside air humidity sensor 37. ) And OFF time (t2, t4) are calculated, but the detection information of the cold room temperature sensor for detecting the temperature of the cold room 2 may also be referred to. For example, in consideration of the fact that the surface temperature of the rotating partition is likely to be lower when the temperature detected by the cold room temperature sensor is low, the average value of the surface temperature of the rotating partition is increased by increasing the ON rate of the dew prevention heater 25. The predetermined value can be maintained with higher accuracy. In the refrigerator of the present embodiment, the ON time and OFF time of the dew proof heater 25 are determined and controlled so that the rotating partition surface temperature becomes a predetermined average temperature, but the rotating partition surface temperature is controlled more accurately. In order to do this, for example, a rotating partition temperature sensor for detecting the surface temperature of the rotating partition is provided in contact with the partition iron plate 23, and the dew proof heater 25 is turned on / off based on the detected temperature of the rotating partition temperature sensor, The ON rate of the dew proof heater 25 may be controlled. Furthermore, in the refrigerator of the present embodiment, the dew proof heater 25 is switched on / off. However, if the temperature fluctuation as shown in FIG. It is good also as control which switches the heating amount of the dew heater 25 strong / weak. In addition, the present invention can be applied not only to the rotary partition but also to a partition portion including a dew proof heater. That is, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

1 Refrigerator 2 Refrigerated room (refrigerated temperature zone)
3 Upper freezer room (freezing temperature room)
4 Lower freezer compartment (freezer temperature room)
5 Vegetable room (refrigerated temperature room)
6 Right refrigerator compartment door 7 Left refrigerator compartment door 8 Upper freezer compartment door 9 Lower freezer compartment door 10 Vegetable compartment door 11 Cooler compartment 12 Cooler 13 Cooling fans 14, 15 Fixed partition 16 Rotating partition 17, 18 Packing (seal member)
19, 20 Fin packing (fin seal member)
21 gap 22 box 23 partition iron plate 24 heat insulating material 25 dew-proof heater (heating means)
25a Code heater 25b Aluminum foil 26 Outside temperature sensor (detection means)
27 Outside air humidity sensor (detection means)
28 Control board 30 Inner box

Claims (5)

A heat insulating box having an opening formed in the front; a first door that opens and closes the opening; a second door that opens and closes the opening adjacent to the first door; and the first door or the first door A partition provided at one of the two doors and positioned at a boundary between the first door and the second door; heating means for heating the partition to suppress the formation of condensation; and the heat insulating box Detecting means for detecting the temperature and humidity of the ambient air, and a control means for controlling the heating amount of the heating means,
The refrigerator characterized by controlling the said heating means so that the time average value of the surface temperature of the said rotation partition part may become below a dew point temperature. A heat insulating box having an opening formed in the front; a first door that opens and closes the opening; a second door that opens and closes the opening adjacent to the first door; and the first door or the first door A partition provided at one of the two doors and positioned at a boundary between the first door and the second door; heating means for heating the partition to suppress the formation of condensation; and the heat insulating box Detecting means for detecting the temperature and humidity of the ambient air, and a control means for controlling the heating amount of the heating means,
The refrigerator is characterized in that the heating means is controlled so that the time during which the surface temperature of the partitioning portion is below the dew point temperature is longer than the time when the surface temperature is above the dew point temperature.   The gap dimension between the first door and the second door is set to be not more than a depth dimension from a front edge of the first door and the second door to the partition part. The refrigerator according to 1 or 2.   The refrigerator according to claim 3, wherein the heating means is controlled so that a surface temperature of the partitioning portion alternately repeats a state above the dew point temperature and a state below the dew point temperature. A heat insulating box having an opening formed in the front; a first door that opens and closes the opening; a second door that opens and closes the opening adjacent to the first door; and the first door or the first door A partition provided at one of the two doors and positioned at a boundary between the first door and the second door; heating means for heating the partition to suppress the formation of condensation; and the heat insulating box Detecting means for detecting the temperature and humidity of the ambient air, and a control means for controlling the heating amount of the heating means,
The first heating mode for controlling the heating means so that the time average value of the surface temperature of the partition is equal to or higher than the dew point temperature, and the time average value of the surface temperature of the partition is equal to or lower than the dew point temperature. And a second heating mode for controlling the heating means, wherein either the first heating mode or the second heating mode can be selected.