JP2017194195A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of preventing a temperature of a cold storage chamber or refrigeration chamber from excessively lowering, and rapidly cooling foods.SOLUTION: A refrigerator including second temperature detection means 52 of detecting a temperature of a cold storage chamber or refrigeration chamber, is configured to, in normal cooling operation, when a detection temperature from the second temperature detection means 52 is equal to or more than a compressor-on threshold, operate a compressor at low speed, and when the detection temperature from the second temperature detection means 52 is equal to or less than a compressor-off threshold, stop the compressor; and in quick cooling operation, even when the detection temperature from the second temperature detection means 52 is equal to or less then the compressor-off threshold after operating the compressor at high speed, continuously operate the compressor at low speed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a refrigerator for storing food, drinking water or the like by refrigeration or freezing.

  Recently, due to changes in the home environment such as the nuclear family and the increase in couples working together, freezing storage methods in freezer rooms tend to diversify. In addition to the conventional usage of purchasing and storing food sold in the freezing temperature range, the use of the freezer in the home includes the quick freezing preservation of meat such as meat or cooking A method of using the quick freezing mode such as quick freezing has been proposed.

  As a method of using such a freezing room, for example, in Japanese Patent Application Laid-Open No. 2006-90663 (Patent Document 1), in a quick freezing mode in which food is to be quickly frozen, the number of rotations of the compressor is set higher than usual. A freezing method is shown.

JP 2006-90663 A

  In the refrigerator described in Patent Document 1, in the quick freezing mode, since the compressor is continuously rotated at a high speed, the temperature of the freezing room is greatly reduced, and in the adjacent refrigeration room or vegetable room, condensation occurs. May occur or food may freeze.

  This invention is made | formed in view of the above-mentioned subject, The objective is to provide the refrigerator which can cool food rapidly, suppressing the temperature of a refrigerator compartment or a freezer compartment falling too much. .

  In order to achieve the above object, the present invention provides a heat insulating box that forms a refrigerator compartment and a freezer compartment, a refrigeration cycle that generates cold air, and the refrigeration compartment and the freezer compartment that cool air from the refrigeration cycle by a blower fan. In a refrigerator having a cold air supply path to be supplied to and a temperature detection means for detecting the temperature of the refrigerator compartment or the freezer compartment, in a normal cooling operation, the temperature detected by the temperature detection means is equal to or higher than a first threshold value. Then, the compressor is operated at the first rotational speed, and the compressor is stopped when the temperature detected by the temperature detecting means becomes equal to or lower than the second threshold value. In the rapid cooling operation, the second speed higher than the first rotational speed is set. After the compressor is operated at a rotational speed of, the compressor continues to operate at a rotational speed lower than the second rotational speed even when the temperature detected by the temperature detecting means is equal to or lower than the second threshold value. .

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the refrigerator which can cool a foodstuff rapidly, suppressing the temperature of a refrigerator compartment or a freezer compartment falling too much.

It is a front external view of the refrigerator to which the present invention is applied. It is a longitudinal cross-sectional view which shows the longitudinal cross-section of the refrigerator shown in FIG. It is a front view which shows the structure inside the back surface in the store | warehouse | chamber of the refrigerator shown in FIG. It is a principal part expanded sectional view of the freezer compartment in Example 1 of this invention. FIG. 6 is an enlarged cross-sectional view of the main part in the vicinity of the temperature detection means shown in FIG. 5. It is a time chart which performs rapid cooling operation by judging the presence or absence of food storage. It is a flowchart which performs the time chart shown in FIG. It is a time chart which performs rapid cooling operation based on other flows. It is a flowchart which performs the time chart shown in FIG. It is a principal part expanded sectional view of the freezer compartment in Example 2 of this invention. It is a principal part expanded sectional view of the freezer compartment in Example 3 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. Is also included in the range.

  Before describing specific embodiments of the present invention, the configuration of a refrigerator to which the present invention is applied will be described with reference to FIGS. FIG. 1 is a front external view of the refrigerator, FIG. 2 is a cross-sectional view showing a longitudinal section of FIG. 1, and FIG. 3 is a front view showing a configuration inside the back of the refrigerator shown in FIG. In FIG. 2, the cross section of the ice making chamber is not shown.

  1 and 2, the refrigerator 1 includes a refrigerator room 2, an ice making room (a part of the freezer room) 3, an upper freezer room 4, a lower freezer room 5, and a vegetable room 6 from above. Here, the ice making chamber 3 and the upper freezer compartment 4 are provided side by side between the refrigerator compartment 2 and the lower freezer compartment 5. As an example, the refrigerating room 2 is a storage room having a refrigeration temperature range of about + 3 ° C., and the vegetable room 6 is a refrigerating temperature zone of about + 3 ° C. to + 7 ° C. Further, the ice making room 3, the upper freezing room 4, and the lower freezing room 5 are storage rooms in a freezing temperature zone of approximately −18 ° C. Although not shown in the figure, a partitioning portion arranged in the vertical direction is provided between the ice making chamber 3 and the upper freezing chamber 4, and the ice making chamber 3 and the upper freezing chamber 4 are bounded by this partition wall. They are juxtaposed in the left-right direction. The upper freezer compartment 4 is smaller in width than the lower freezer compartment 5 adjacent to the lower part thereof, has a smaller volume than the lower freezer compartment 5, and a small amount of food is frozen and stored.

  The refrigerating room 2 is provided with a folding door (so-called French type) refrigerating room doors 2a and 2b divided into left and right sides on the front side. The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are each provided with a drawer type ice making room door 3a, an upper freezing room door 4a, a lower freezing room door 5a, and a vegetable room door 6a.

  In addition, a packing (not shown) with magnets built in along the outer edge of each door is provided on the surface of each door on the storage room side. When each door is closed, the outside of the refrigerator formed of an iron plate is provided. It is set as the structure which closely_contact | adheres to the flange of a box and each partition iron plate, and suppresses the penetration | invasion of the external air into a storage chamber, and the leakage of the cold air from a storage chamber.

  Here, as shown in FIG. 2, the machine room 11 is formed in the lower part of the refrigerator main body 10, and the compressor 12 is incorporated in this. The cooler storage chamber 13 and the machine chamber 11 are communicated with each other by a drain passage 14 so that condensed water can be discharged.

  As shown in FIG. 2, the outside of the refrigerator body 10 and the inside of the refrigerator are separated by a heat insulating box 15 formed by filling a foam heat insulating material (foamed polyurethane) between the inner box and the outer box. Yes. Further, the heat insulating box 15 of the refrigerator body 10 has a plurality of vacuum heat insulating materials 16 mounted thereon. The refrigerator main body 10 is divided into a refrigerator compartment 2, an upper freezer compartment 4 and an ice making chamber 3 (see FIG. 1, the ice making chamber 3 is not shown in FIG. 2) by an upper heat insulating partition wall 17a. The lower freezer compartment 5 and the vegetable compartment 6 are partitioned by the wall 17b.

  In addition, a horizontal partition 18 is provided in the upper part of the lower freezer compartment 5. The horizontal partition 18 partitions the ice making chamber 3 and the upper freezing chamber 4 and the lower freezing chamber 5 in the vertical direction. However, since the ice making chamber 3, the upper freezing chamber 4, and the lower freezing chamber 5 are fluidly connected, the same cold air is supplied. In addition, a vertical partition that partitions the ice making chamber 3 and the upper freezing chamber 4 in the left-right direction is provided above the horizontal partition 18.

  The horizontal partition 18 is in contact with packing (not shown) provided on the storage room side surface of the lower freezer compartment door 5a together with the front surface of the lower heat insulating partition wall 17b and the front surfaces of the left and right side walls. Packings (not shown) provided on the storage room side surfaces of the ice making room door 3a and the upper freezing room door 4a are the horizontal partition 18, the vertical partition 53 (FIG. 4), the upper heat insulating partition wall 17a, and the refrigerator body 1. By contacting the front surfaces of the left and right side walls, the movement of cold air between each storage chamber and each door is suppressed. In addition, since the ice making chamber 3, the upper freezer compartment 4, and the lower freezer compartment 5 are maintained in the same freezing temperature zone, the heat insulating performance of the horizontal partition 18 and the vertical partition 53 is the upper heat insulating partition wall 17a and the lower side. It is not required as much as the heat insulating partition wall 17b.

  As shown in FIG. 2, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are attached with doors 4a, 5a, 6a provided in front of the respective storage compartments. The upper freezer compartment 4 is provided with an upper freezer storage container 41, and the lower freezer compartment 5 has a plurality of stages of freezer storage containers, that is, an uppermost freezer storage container 63, an upper freezer storage container 61, and a lower freezer storage container 62. Has been placed. Furthermore, an upper vegetable storage container 71 and a lower vegetable storage container 72 are arranged in the vegetable room 6.

  Then, the ice making room door 3a, the upper freezing room door 4a, the lower freezing room door 5a, and the vegetable room door 6a are each put on a handle portion (not shown) and pulled out to the front side, thereby making an ice making storage container 3b (not shown). ), An upper frozen storage container 41, a lower frozen storage container 62, an upper vegetable storage container 71, and a lower vegetable storage container 72 can be pulled out.

  Specifically, the lower-stage frozen storage container 62 has a flange portion at the upper side of the lower-stage frozen storage container 62 suspended from a support arm 5d attached to the inner box of the freezer compartment. The lower freezing storage container 62 and the upper freezing storage container 61 are pulled out at the same time as the freezer compartment door 5a is pulled out. The uppermost frozen storage container 63 is placed on an uneven part (not shown) formed on the side wall of the freezer compartment 5 and is slidable in the front-rear direction.

  Similarly, the lower vegetable storage container 72 is suspended by a support arm 6d attached to the inner box of the vegetable compartment door 6a, and the upper vegetable storage container 71 is placed on the flange portion of the lower vegetable storage container 72. Yes. In addition, the vegetable room 6 is provided with an electric heater 6C fixed to the heat insulating box 15, and a temperature suitable for storing vegetables so that the temperature of the vegetable room 6 is not overcooled by the electric heater 6C. It is trying to become. The electric heater 6C may be provided if necessary, but in the present embodiment, the electric heater 6C is provided so that vegetables can be stored better.

  Next, a method for cooling the refrigerator will be described. A refrigerator housing chamber 13 is formed in the refrigerator main body 1, and a cooler 19 is provided therein as a cooling means. The cooler 19 (for example, a fin tube heat exchanger) is provided in a cooler storage chamber 13 provided at the back of the lower freezer compartment 5. A blower fan 20 (a propeller fan as an example) is provided as a blower in the cooler storage chamber 13 and above the cooler 19.

  Air cooled by heat exchange in the cooler 19 (hereinafter, low-temperature air heat-exchanged by the cooler 19 is referred to as “cold air”) is supplied by a blower fan 20 to a refrigerator compartment air duct 21, a freezer compartment air duct 22, And it sends to each storage room of the refrigerating room 2, the ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 via the ice making room air duct which is not illustrated.

  The blast to each storage room is sent to the first blast control means (hereinafter referred to as the refrigeration room damper 23) for controlling the amount of air sent to the refrigeration room 2 in the refrigeration temperature zone, and to the freezing rooms 4 and 5 in the refrigeration temperature zone. It is controlled by second air flow control means (hereinafter referred to as freezer compartment damper 24) that controls the air flow. Incidentally, the air ducts to the refrigerator compartment 2, the ice making room 3, the upper freezer room 4, the lower freezer room 5, and the vegetable room 6 are arranged on the back side of each storage room of the refrigerator body 1 as shown by broken lines in FIG. Is provided. Specifically, when the refrigerator compartment damper 23 is in the open state and the freezer compartment damper 24 is in the closed state, the cold air is sent to the refrigerator compartment 2 from the outlets 25 provided in multiple stages via the refrigerator compartment air duct 21.

  The cold air that has cooled the refrigerator compartment 2 is provided on the lower right rear side of the lower heat insulating partition wall 18 from the refrigerator compartment return port 26 provided in the lower part of the refrigerator compartment 2 through the refrigerator compartment-vegetable compartment communication duct 27. The air is blown from the vegetable room outlet 28 to the vegetable room 6. The return cold air from the vegetable compartment 6 passes from the vegetable compartment return duct inlet 29 provided in front of the lower part of the lower heat insulating partition wall 18 through the vegetable compartment return duct 30 and from the vegetable compartment return duct outlet to the lower part of the cooler storage compartment 13. Return to. In addition, it is good also as a structure which returns to the lower right part seeing from the upper surface of the cooler storage chamber 12 in FIG. 3, without connecting the refrigerator compartment-vegetable compartment communication duct 27 to the vegetable compartment 6 as another structure. As an example in this case, a vegetable room air duct is arranged at the front projection position of the refrigerator compartment-vegetable room communication duct 27, and the cold air heat-exchanged by the cooler 19 is directly blown from the vegetable room outlet 28 to the vegetable room 6. To come.

  As shown in FIGS. 2 and 3, a partition member 31 is provided in front of the cooler storage chamber 13 to partition between the storage chambers and the cooler storage chamber 12. As shown in FIG. 3, the partition member 31 has a pair of upper and lower outlets 32 a, 32 b, 33 a, and 33 b formed therein. When the freezer damper 24 is in an open state, Are blown by the blower fan 20 to the ice making chamber 3 and the upper freezing chamber 4 from the blowout ports 32a and 32b through the ice making chamber blowing duct and the upper freezing chamber blowing duct 34 (not shown). Further, the air is blown from the outlets 33 a and 33 b to the lower freezer compartment 5 through the lower freezer compartment air duct 35. It should be noted that the lower freezer compartment 5 may be provided with additional outlets as necessary.

  In addition, a control device including a CPU, a memory such as a ROM and a RAM, an interface circuit, and the like is provided on the upper surface of the ceiling wall of the refrigerator body 10, and an outside air temperature sensor (not shown) and a cooler temperature sensor (not shown). ), Refrigerator compartment temperature sensor (not shown), vegetable compartment temperature sensor (not shown), freezer compartment temperature sensor (not shown), doors 2a, 2b, 3a, 4a, 5a, 6a open / close Connected to a door sensor (not shown) for detecting each state, a temperature setter (not shown) provided on the inner wall of the refrigerator compartment 2, etc., and control of turning on / off the compressor 12 by a program preinstalled in the ROM , Control of the respective actuators that individually drive the refrigerator compartment damper 23 and the freezer compartment damper 24, ON / OFF control and rotation speed control of the blower fan 20, and ON / OFF of the alarm that informs the door open state It is adapted to perform control of.

  Returning to FIG. 1, the refrigerator compartment door 2a is provided with an input control unit 40, and this input control unit 40 is connected to the control device described above. Therefore, the temperature of each storage room of the refrigerator 1 can be set by an input from the input control unit 40. For example, the temperature of each storage chamber is controlled by controlling the rotational speed of the compressor 12, the rotational speed of the blower fan 20, the opening / closing amount of the refrigerator compartment damper 23 and the freezer compartment damper 24, and the like.

  In the refrigerator configured as described above, it is required to detect the storage state of the food by arranging the temperature detection means at an appropriate position where the presence or absence of the storage of the food can be accurately detected. Next, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 4 shows an enlarged cross section of the main part of the freezer compartment, and FIG. 5 shows an enlarged cross section of the main part in the vicinity of the temperature detecting means. In FIG. 4, the first temperature detection means comprised of a thermistor or the like on the depth side end face of a vertical partitioning part (which is a partitioning component not provided with a vacuum heat insulating material) 53 that partitions the ice making chamber 3 and the upper freezing chamber 4 50 is attached. A second temperature detecting means 52, which is also composed of a thermistor or the like, is disposed on the rear wall 51 near the upper side of the lower freezer compartment 5.

  In this embodiment, the first temperature detecting means 50 measures the temperature of a space that depends on the food temperature, and the second temperature detecting means 52 measures the temperature of a space that is not affected by the food temperature. Therefore, it is determined from the fluctuation state of the output signals of the two temperature detecting means whether food having a temperature higher than the freezer temperature is stored in the upper freezer compartment 4 or the lower freezer compartment 5. Here, since the second temperature detection means 52 is a temperature detection means that has been conventionally provided, a detailed description of the configuration is omitted. The first temperature detection means 50 is not limited to a thermistor, and may be a non-contact temperature detector such as an infrared sensor. However, the thermistor has a higher degree of design freedom than an infrared sensor in which the temperature cannot be measured unless the food is within the visual field range. Therefore, it is desirable that the first temperature detection means 50 be composed of a thermistor.

  Now, the first temperature detecting means 50 which is a feature of the present embodiment is provided at the lower end of the vertical partition 53 provided so as to be orthogonal to the horizontal partition 18 as shown in FIG. . A first temperature detection means 50 is arranged at the lower end portion 54 in the depth direction of the vertical partition 53, and the signal line 55 of the first temperature detection means 50 is connected to the outside through the inside of the vertical partition 53. As shown in FIG. The first temperature detection means 50 and a part of the signal line 55 are covered with a sensor cover 57, and the sensor cover 57 is integrated with the vertical partition 53 by screws, adhesive, welding, etc. The fixing means is fixed to the vertical partition 53.

  Here, in the vertical partition 53, a first temperature detecting means 50, a signal line 55, a connector 56 for transmitting an output signal to the outside, and a sensor cover 57 are assembled in advance to constitute an assembly. The vertical partition portion 53 can be incorporated by fixing the assembly of the vertical partition portion 53 to the upper heat insulating partition wall 17a with screws. A connector (not shown) connected to the control device is fixed to a region where the vertical partition 53 on the lower side of the upper heat insulating partition wall 17a is located.

  Therefore, it is a structure that can be connected to the connector 56 of the first temperature detecting means 50 by incorporating the vertical partition 53. In the lower freezer compartment 5, a lower frozen storage container 62, an upper frozen storage container 61, and an uppermost frozen storage container 63 are arranged from below.

  In such a configuration, it is assumed that raw meat or cooked food is stored in the uppermost frozen storage container 63 of the lower freezer compartment 5.

  At this time, the first temperature detection means 50 is within the vertical projection of the uppermost frozen storage container 63 of the lower freezer compartment 5 and is higher than the upper end portion of the uppermost frozen storage container 63 and the lower end of the upper heat insulating partition wall 17a. Or the upper freezing container 41 of the upper freezer compartment 4 is located at a position lower than the upper end portion. Thus, since the first temperature detection means 50 is disposed close to the uppermost frozen storage container 63, the first temperature detection means 50 is easily affected by the temperature of the food stored in the uppermost frozen storage container 63. ing. In other words, the first temperature detecting means 50 measures the temperature of the space that depends on the food temperature stored in the uppermost frozen storage container 63.

  On the other hand, the second temperature detection means 52 is outside the vertical projection of the uppermost frozen storage container 63 of the lower freezer compartment 5, specifically on the back side of the lower freezer compartment 5, and away from the uppermost frozen storage container 63. Therefore, the temperature is not limited to the temperature of the food stored in the uppermost frozen storage container 63, but is similarly affected by the inflow of outside air by opening and closing the door and the temperature of the food stored outside the upper frozen storage container 63. That is, the second temperature detecting means 52 measures not only the temperature of the food stored in the uppermost frozen storage container 63 but also the temperature of the entire freezer compartment. Therefore, by comparing the output state of the first temperature detection means 50 and the time series output signal of the second temperature detection means 52, it is determined whether or not the food is stored in the uppermost frozen storage container 63. become able to.

  In the present embodiment, since the first temperature detecting means 50 is not provided on the upper heat insulating partition wall 17a, a vacuum heat insulating material is widely attached to the upper heat insulating partition wall 17a, and leakage of cold heat from the upper heat insulating partition wall 17a. Can be suppressed. That is, since the movement of heat between the freezer compartment and the refrigerator compartment is suppressed, power consumption for cooling the freezer compartment can be suppressed, and excessive cooling of the refrigerator compartment can also be suppressed.

  In the present embodiment, since the first temperature detection means 50, the signal line 55, the connector 56, and the sensor cover 57 are incorporated in the vertical partition 53 in advance, the assembly to the refrigerator becomes easy and the work efficiency is improved. Can be improved.

  Next, a determination method for determining whether or not food is stored will be described. FIG. 6 shows the behavior of each temperature detection means and the operating state of the compressor when the discrimination is executed, and FIG. 7 shows the control flow.

  In FIG. 6, it is assumed that the door of the target lower freezer compartment 5 is opened at a certain time at time t0, food such as raw meat is stored in the uppermost storage container 63, and is closed at the time t1. In this state, the compressor is operated at a low rotation as a normal cooling mode, and the blower fan is also operated at a low rotation.

  When food is stored, the temperature of the cold air around the food is unlikely to decrease due to the temperature of the food, so that the temperature detected by the first temperature detecting means 50 rises and even after the door is closed. High temperature continues for a while.

  On the other hand, when the door is opened and closed, but no food is put in, the temperature rise of the temperature detected by the first temperature detecting means 50 is temporary, and the temperature is likely to drop after the door is closed. Therefore, when the temperature detected by the first temperature detecting means 50 continues for a certain time T1 or more in a state where the detected temperature is equal to or higher than the food detection threshold, it can be determined that the food is stored.

  The food detection determination based on the detection temperature of the first temperature detection means 50 described above is performed only when the detection temperature of the first temperature detection means 50 at the time t0 when the lower freezer compartment door 5a is opened is less than the food detection threshold. To do. In addition, the food detection determination described above is performed as a detection monitoring reference time T0 from a time t1 when the lower freezer compartment door 5a is closed, and is performed only within the detection monitoring reference time T0. This is because the temperature detected by the first temperature sensor 50 may rise even when high-temperature food is stored in a storage room other than the lower freezer room, such as an upper freezer room or a refrigerator room. Therefore, if the lower freezer compartment door 5a is already in a high temperature state when the lower freezer compartment door 5a is opened, or if the detected temperature of the first temperature detecting means 50 rises without interlocking with the opening and closing of the lower freezer compartment door 5a, the lower freezer compartment 5, it is assumed that no food is put in the uppermost frozen storage container 63. As a result, it is possible to prevent erroneous detection and subsequent malfunction that determine that food has been input when food is not actually input.

  Next, control of the cooling operation will be described.

  First, when it is determined by the above-described food detection determination that no food has been added, the operation in the normal cooling mode is performed. In this normal cooling mode, when the temperature detected by the second temperature detecting means 52 reaches the compressor on threshold (first threshold), the compressor is started to cool the freezer compartment. When the inside of the freezer compartment is sufficiently cooled and the temperature detected by the second temperature detecting means reaches the compressor off threshold (second threshold), the operation of the compressor is stopped and the inside of the freezer compartment is temporarily suspended. Here, in consideration of energy saving and noise, it is desirable to operate the compressor at the lowest possible speed. For this reason, when the compressor starts operation, the compressor is operated at a low rotation speed (first rotation speed), and when the door is opened or closed or when the temperature detected by the second temperature detecting means 52 becomes high. If necessary, the rotational speed is increased to a high rotational speed (second rotational speed higher than the first rotational speed) to accelerate cooling in the freezer compartment. By repeating this operation, the temperature in the freezer compartment is adjusted to be kept within a predetermined range.

  On the other hand, if it is determined in the food detection determination described above that food has been input, the process proceeds to a rapid cooling operation. In this rapid cooling operation, the same operation as in the normal cooling mode is performed until the temperature detected by the second temperature detecting means 52 reaches the compressor off threshold, but when the compressor off threshold is reached, the operation of the compressor is stopped. Without lowering the rotation speed from high to low, continue operation. Here, if the compressor is operated at a high rotation for a long time, the temperature of the freezer compartment is greatly reduced, and there is a possibility that problems such as condensation, frost formation and food freezing in the adjacent refrigerator compartment or vegetable compartment may occur. . However, it is possible to freeze the food quickly while suppressing the occurrence of the above-mentioned problems by extending the operation time by reducing the rotation of the compressor and continuing to supply cold air without interruption. For example, even for foods that require time for freezing, such as large-size foods and high-temperature foods, the supply of cold air can be continued for a longer time than in the case of high rotation, so the time until freezing can be shortened. Note that the low-rotation compressor operation after reaching the compressor-off threshold continues until the temperature detected by the first temperature detection means 50 reaches the operation end threshold.

  However, as shown in FIG. 8, when it is determined that food has been introduced, the compressor may be stopped. At this time, according to the control in the normal cooling mode, the operation of the compressor is started after reaching the compressor-on threshold value, and after reaching the compressor-off threshold value, as described above, the first temperature detecting means 50 The low-rotation compressor operation is continued until the detected temperature reaches the operation end threshold. In this case, the compressor stops at an early stage after the food is added, and the supply of cold air is interrupted. At this stage, the food still reaches the range of −1 ° C. to −5 ° C., which is the ice crystal formation zone. It is thought that there are not many. Therefore, if the cool air is continuously supplied after the compressor starts operation again, it is possible to quickly pass through the temperature range of the ice crystal generation zone, which is effective in maintaining freshness.

  Next, the concept of the control flow for realizing the above-described time chart will be briefly described with reference to FIG.

  First, the normal cooling mode is executed in step S10. Here, it is detected in step S11 that the user has opened the lower freezer compartment 5 door. When the door 5 of the lower freezer compartment 5 is opened in step S11, the detected temperature of the first temperature detecting means 50 and the food detection threshold are compared in step S12. If the detected temperature is already equal to or higher than the food detection threshold, step Proceeding to S24, it is determined that no food has been added, and the process proceeds to the normal cooling mode in step S25.

  If the detected temperature of the first temperature detecting means 50 is lower than the food detection threshold value in step S12, if it is detected in step S13 that the user has closed the door of the lower freezer compartment 5, the process proceeds to step S14, and detection monitoring is performed. Start timer count of time. Next, it progresses to step S15 and the detection temperature of the 1st temperature detection means 50 and a food detection threshold value are compared. If the detected temperature is equal to or higher than the food detection threshold, the timer count of the food detection time is started in step S16. Next, the process proceeds to step S17, and it is determined by comparing the food detection timer and the food detection reference time T1 whether the high temperature state continues for a predetermined time. If the food detection timer is less than the food detection reference time T1, the detection monitoring timer and the detection monitoring reference time T0 are compared in step S23. If the detection monitoring timer has not reached the detection monitoring reference time T0, step S14 is performed. Return to and repeat in the same way. On the other hand, if the detected temperature of the first temperature detecting means 50 is lower than the food detection threshold value in step S15, the process proceeds to step S23. In step S23, the detection monitoring timer is compared with the detection monitoring reference time T0. If the detection monitoring timer has not reached the detection monitoring reference time T0, the process returns to step S14 and is repeated in the same manner. When the detection monitoring timer reaches the detection monitoring reference time T0 in step S23, the process proceeds to step S24, where it is determined that no food is put in, and the normal cooling mode is reached in step S25.

  On the other hand, when the food detection timer reaches the food detection reference time T1 in S17, it is determined in step S18 that the food has been input, and the process proceeds to the rapid cooling operation. First, after the operation in the normal cooling mode is continued in step S19, it is determined in step S20 whether or not the temperature detected by the second temperature detecting means 52 has reached the compressor off threshold. If the detected temperature is higher than the compressor off threshold, the process returns to step S19 and repeats in the same manner. When the compressor off threshold is reached in step S20, the process proceeds to step S21, and the compressor is continuously operated at a low speed. Then, in step S22, the detected temperature of the first temperature detecting means 50 is compared with the operation end threshold value. If the detected temperature is higher than the operation end threshold value, the process returns to step S21 and the same is repeated. When the operation end threshold value is reached in step S22, the process proceeds to step S25 to proceed to the normal cooling mode.

  In the case of the time chart of FIG. 8, step S26 for determining whether or not the compressor is on is provided after step S19. If the compressor is off in step S26, the process returns to step S19 and repeats in the same manner. On the other hand, if the compressor is in the on state in step S26, the process proceeds to step S20, and the flow is the same as described above.

  In this way, it is possible to control whether or not the quick cooling mode is executed by determining whether or not there is food in the uppermost frozen storage container 63 using two temperature sensors. That is, it is possible to provide a refrigerator capable of automatically quick freezing when food having a high temperature is stored while suppressing a decrease in heat insulation performance between the upper freezer compartment and the refrigerator compartment. In addition, regarding the upper freezing storage container 61 and the lower freezing storage container 62 other than the uppermost freezing storage container 63, the upper freezing storage container 61, and the lower freezing storage container 62, it is necessary for a user to perform quick freezing without using a temperature detection means. Can be set. Further, the upper freezer compartment 4 may be a room that can be switched not only to the freezing temperature zone but also to the refrigeration temperature zone.

  Further, in this embodiment, when it is determined that the food has been put into the freezer compartment, the compressor is first operated at a high rotation, and the compressor is not stopped as it is or after the compressor is temporarily stopped, and then the high rotation is performed. Continue to run at low speed for a longer time than at. For this reason, even when the temperature detected by the second temperature detecting means 52 is lowered and the inside of the freezer compartment is cooled to the target temperature, it is possible to continue cooling the uncooled food. As a result, the frequency at which the compressor is stopped or restarted can be reduced, and the life of the compressor can be maintained longer. In addition, since the time for operating the compressor at a high speed can be shortened, not only can the overall power consumption be reduced compared to the conventional rapid cooling operation, but also the generation of noise and vibration due to the high speed of the compressor. Time can be shortened.

  Further, in the present embodiment, the uppermost refrigerated storage container 63 having a smallest height dimension and a thin space compared to the storage container in the upper freezer compartment 4 and the other storage containers in the lower freezer compartment 5 is rapidly Since it is a target for freezing, there is an advantage that it is difficult to stack foods and is easy to store and take out. Further, since the uppermost frozen storage container 63 has a larger width than the storage container of the upper freezer compartment 4, more food can be arranged in the left-right direction.

  Here, an aluminum tray is laid as a metal heat conduction plate on substantially the entire surface of the uppermost frozen storage container 63, and a plurality of convex portions or concave portions are formed in the depth direction and the left-right direction on the upper surface of the aluminum tray. Has been. Aluminum itself is a material having high thermal conductivity, and the surface area is increased by a plurality of irregularities, so that the cooling performance of the uppermost frozen storage container 63 is higher than that of the upper frozen storage container 61 and the lower frozen storage container 62. It is high. Then, the cold air is supplied from the vertical outlet of the uppermost frozen storage container 63, specifically, from the outlet at the substantially same height as the uppermost frozen storage container 63 on the back side of the lower freezer compartment 5. For this reason, the food in the uppermost frozen storage container 63 is rapidly cooled. In the present embodiment, an example in which an aluminum tray is disposed in the uppermost storage container 63 of the lower freezer compartment 5 is shown. However, there are a plurality of storage containers in the refrigerator compartment 2, and among these, the uppermost storage container An aluminum tray may be arranged for chilled cooling, and this storage container may be a target for rapid cooling.

  Next, another embodiment of the mounting position of the first temperature sensor will be described with reference to FIGS. Note that the same reference numerals indicate the same components, and therefore will be described when detailed description is necessary, and the rest will be omitted.

  In FIG. 10, the first temperature detecting means 50 is provided on the lower surface of the horizontal partition 18 provided between the upper freezer compartment 4 and the lower freezer compartment 5. The horizontal partition 18 does not separate the upper freezer 4 and the lower freezer 5, but is a partition component that supports the upper freezer 4 and the ice making chamber 3. In the present embodiment, only two storage containers, that is, an upper refrigeration storage container 61 and a lower refrigeration storage container 62 are arranged in the lower freezer compartment 5.

  Since the horizontal partition 18 is provided between the upper freezer compartment 4 and the lower freezer compartment 5, no vacuum heat insulating material is provided. And in the case of a present Example, it detects that the foodstuff was accommodated in the upper stage frozen storage container 61 of the lower side of the horizontal partition part 18. FIG. According to this configuration, since no temperature detecting means is provided on the upper heat insulating partition wall 17a, the vacuum heat insulating material is widely attached to the upper heat insulating partition wall 17a, and the leakage of cold heat from the upper heat insulating partition wall 17a can be suppressed. it can.

  In FIG. 11, the first temperature detection means 50 is provided on the lower surface of the horizontal partition 18 a provided between the upper freezer compartment 4 and the lower freezer compartment 5. Unlike FIG. 10, the horizontal partition 18 a separates the upper freezer compartment 4 and the lower freezer compartment 5. However, it is the same that it is a partition component which supports the upper freezer compartment 4 and the ice making chamber 3.

  Since the horizontal partition 18a is provided between the upper freezer compartment 4 and the lower freezer compartment 5, no vacuum heat insulating material is provided. And also in a present Example, it detects that the foodstuff was accommodated in the upper stage frozen storage container 61 of the lower side of the horizontal partition part 18a. According to this configuration, since no temperature detecting means is provided on the upper heat insulating partition wall 17a, the vacuum heat insulating material is widely attached to the upper heat insulating partition wall 17a, and the leakage of cold heat from the upper heat insulating partition wall 17a can be suppressed. it can.

  In the first to third embodiments described above, the refrigerator having a layout in which the vegetable compartment 6 is arranged at a position lower than the lower freezer compartment 5 has been described. However, the layout in which the vegetable compartment is arranged between the refrigerator compartment and the upper freezer compartment. It may be a refrigerator. Even in a refrigerator having such a layout, the temperature detection means is installed in a vertical projection of the uppermost storage container of the lower freezer compartment and at a position lower than the heat insulating partition wall that partitions the vegetable compartment and the upper freezer compartment. In addition, it is possible to automatically freeze food that is warm automatically while suppressing a decrease in the heat insulating performance of the heat insulating partition wall.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, 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. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.

  DESCRIPTION OF SYMBOLS 10 ... Refrigerator main body, 2 ... Refrigeration room, 3 ... Ice making room, 4 ... Upper freezing room, 5 ... Lower freezing room, 6 ... Vegetable room, 19 ... Cooler, 12 ... Cooler storage room, 18 ... Thermal insulation partition wall, DESCRIPTION OF SYMBOLS 20 ... Blower fan, 50 ... 1st temperature detection means, 51 ... Back wall, 52 ... 2nd temperature detection means, 53 ... Vertical partition part, 54 ... Depth direction lower end part, 55 ... Signal wire, 56 ... Connector, 57: Sensor cover.

Claims (3)

A heat insulating box forming a refrigerator compartment and a freezer compartment, a refrigeration cycle for generating cold air, a cold air supply path for supplying the cold air from the refrigeration cycle to the refrigerator compartment and the freezer compartment by a blower fan, and the refrigerator compartment or In a refrigerator provided with a temperature detection means for detecting the temperature of the freezer compartment,
In the normal cooling operation, the compressor is operated at the first rotation speed when the temperature detected by the temperature detection means is equal to or higher than a first threshold value, and when the temperature detected by the temperature detection means is equal to or lower than the second threshold value, the compressor is operated. Stop
In the rapid cooling operation, after the compressor is operated at a second rotational speed higher than the first rotational speed, the compressor is turned on even if the temperature detected by the temperature detecting means falls below the second threshold value. The refrigerator is characterized in that the operation is continued at a rotation speed lower than the second rotation speed. A heat insulating box forming a refrigerator compartment and a freezer compartment, a refrigeration cycle for generating cold air, a cold air supply path for supplying the cold air from the refrigeration cycle to the refrigerator compartment and the freezer compartment by a blower fan, and the refrigerator compartment or In a refrigerator provided with a temperature detection means for detecting the temperature of the freezer compartment,
When food is put into the refrigerator compartment or the freezer compartment, after operating the compressor at a second rotation speed for a predetermined time, the first rotation time is longer than the predetermined time and lower than the second rotation speed. A refrigerator characterized in that the compressor is operated at a rotational speed. In claim 1 or 2,
After operating the compressor at the second rotational speed, the refrigerator is operated at the first rotational speed without stopping the compressor.

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