JP5008440B2 - Cooling storage - Google Patents

Description

  The present invention relates to a cold storage having a plurality of storage chambers having different internal set temperatures.

  An example of this type of cold storage is a refrigerator-freezer. The refrigerator / freezer has a main body made of a heat insulating box and is divided into a refrigerator compartment and a freezer compartment by a heat insulating partition wall, and each compartment has a cooler that constitutes a part of an individually provided refrigeration cycle. The cooling fan is provided in each chamber, and in each room, the internal temperature detected by the internal temperature sensor and a predetermined internal temperature setting (for example, 5 ° C. in the refrigerator compartment, − 25 ° C.), and depending on whether the detected temperature is higher or lower than the set temperature, the cooling operation and the stop thereof are repeated, so that each chamber is maintained substantially at the set temperature in the chamber. (For example, refer to Patent Document 1).

More specifically, the above-described control operation is shown by taking the refrigerator compartment side as an example. As shown in FIG. 8, the temperature detected by the internal temperature sensor is the upper limit value of the internal set temperature (5 ° C.). When the temperature rises to (5 ° C. + 2K = 7 ° C.), the compressor of the corresponding refrigeration cycle is operated, and when the temperature falls to the lower limit value (5 ° C.−2K = 3 ° C.), the compressor is stopped. It has become. During the cooling operation, the inside air is heat-exchanged with the cooled cooler to generate cold air, and this cold air is circulated into the refrigerator compartment by a cooling fan, thereby cooling the refrigerator compartment. While the internal air passes through the cooler, moisture in the internal air becomes frost and adheres to the cooler, so that the humidity in the refrigerator compartment decreases. On the other hand, since the cooler is not cooled while the cooling operation is stopped, the frost melts and becomes water droplets when the cooler itself becomes 0 ° C. or more, and this is diffused into the refrigerator compartment by the cooling fan. Humidity rises.
JP 2000-220939 A

As described above, in the refrigerated room, the humidity tends to be high while the cooling operation is stopped. However, in this case, there is a problem in that dew condensation occurs on the partition wall separating the freezer room controlled to a low temperature. In particular, if the ambient temperature at the position where the refrigerator / freezer is installed is low, the temperature rise in the refrigerator compartment is also suppressed, so that the cooling operation is stopped for a longer time, and the high humidity state becomes longer, resulting in further condensation. There were circumstances that made it easier.
Even when the internal load is large, the temperature rise in the refrigerator compartment is suppressed, the cooling operation is stopped for a longer time, and the state of high humidity is also longer, so that condensation is more likely to occur.
The present invention has been completed based on the above circumstances, and an object thereof is to suppress dew condensation in a storage room having a higher internal set temperature.

According to the first aspect of the present invention, a plurality of storage chambers are formed by partitioning a heat insulating partition wall in a storage body composed of a heat insulating box, and each storage chamber is provided with an individual refrigeration apparatus having a compressor and circulation. A cooler constituting an independent refrigeration cycle by being connected , a cooling fan, and an internal temperature sensor for detecting the internal temperature are provided, and the internal set temperatures differing from each other are set. In each storage room, when the detected temperature detected by the internal temperature sensor reaches the upper limit of the corresponding internal set temperature, the cooling operation of the cooler is accompanied by the operation of the compressor of the corresponding refrigeration cycle. When the lower limit of the set temperature in the cabinet is reached , the cooling operation of the cooler is repeatedly stopped along with the stop of the compressor in the same refrigeration cycle, so that the corresponding set temperature in the cabinet is To be maintained in The cooling storage is provided with an ambient temperature sensor for detecting the ambient temperature at the installation location of the cooling storage, and when the detected temperature of the ambient temperature sensor is equal to or lower than a predetermined temperature, the storage with the higher set temperature in the storage is stored. It is characterized in that a correction means for correcting so as to lower the upper limit value of the set temperature in the cabinet only in the room is provided.

According to the invention of claim 2, a plurality of storage chambers are formed by partitioning a heat insulating partition wall in a storage body composed of a heat insulating box, and each storage chamber is provided with an individual refrigeration apparatus having a compressor and circulation. A cooler constituting an independent refrigeration cycle by being connected , a cooling fan, and an internal temperature sensor for detecting the internal temperature are provided, and the internal set temperatures differing from each other are set. In each storage room, when the detected temperature detected by the internal temperature sensor reaches the upper limit of the corresponding internal set temperature, the cooling operation of the cooler is accompanied by the operation of the compressor of the corresponding refrigeration cycle. When the lower limit of the set temperature in the cabinet is reached , the cooling operation of the cooler is repeatedly stopped along with the stop of the compressor in the same refrigeration cycle, so that the corresponding set temperature in the cabinet is To be maintained in In the cooling storage, a timer for measuring the stop time of the cooling operation of the cooler in the storage room with the higher internal set temperature is provided, and when the measured time of the timer is equal to or longer than a predetermined time, the internal set temperature is It is characterized in that a correction means for correcting so as to lower the upper limit value of the set temperature in the cabinet only in the higher storage room is provided.

<Invention of Claim 1>
When the ambient temperature detected by the ambient temperature sensor is lower than the specified temperature in the storage room with the higher interior temperature, the upper limit of the interior temperature that becomes the temperature at which the cooling operation of the cooler is switched from the stop to the restart The value is revised downward. Thereby, each cooling stop time, that is, the time to reach a high humidity state is shortened, and it is possible to suppress dew condensation on the partition wall between the storage chamber having the lower internal set temperature. Therefore, the food stored in the storage room having the higher internal temperature is prevented from getting wet, and can be stored more hygienically.
In addition, the cooler in each storage room has an independent refrigeration cycle by being circulated and connected to an individually provided refrigeration apparatus. Therefore, the cooler in the storage room with the higher internal set temperature is In accordance with the operation and stop of the compressor of the corresponding refrigeration cycle, execution and stop of the cooling operation are controlled. Applicable to a type in which an independent refrigeration cycle is provided for each storage room.

<Invention of Claim 2>
In the storage room with the higher set temperature in the cabinet, when each stop time of the cooling operation of the cooler measured by the timer is longer than the predetermined time, the inside temperature becomes the temperature at which the cooling operation is switched from the stop to the restart. The upper limit of the set temperature is corrected downward. Thereby, it is prevented that each cooling stop time, that is, the time to reach a high humidity state is lengthened, and it is possible to suppress dew condensation on the partition wall between the storage room having a lower internal set temperature. Therefore, the food stored in the storage room having the higher internal temperature is prevented from getting wet, and can be stored more hygienically.

In addition, the cooler in each storage room has an independent refrigeration cycle by being circulated and connected to an individually provided refrigeration apparatus. Therefore, the cooler in the storage room with the higher internal set temperature is In accordance with the operation and stop of the compressor of the corresponding refrigeration cycle, execution and stop of the cooling operation are controlled. Applicable to a type in which an independent refrigeration cycle is provided for each storage room.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, a four-door refrigerator-freezer is illustrated.
As shown in FIGS. 1 and 2, the refrigerator / freezer has a main body 10 made of a slightly vertically long heat insulating box with a front opening. Inside the main body 10, a heat insulating partition wall is provided at the center in the frontage direction. 11, the refrigerator compartment 12R is formed on the left side as viewed from the front, and the freezer compartment 12F is formed on the right side. A double-spread type heat insulating door 13 is attached to the front opening of the main body 10 in two upper and lower stages. The main body 10 is supported by four illustrated legs 14 arranged on the bottom surface, and a machine room 16 is formed on the upper surface of the main body 10 by being surrounded by a panel.

  The refrigerator compartment 12R and the freezer compartment 12F are equipped with independent refrigeration cycles 20R and 20F, respectively. As shown in FIG. 3, the refrigeration and freezing refrigeration cycles 20R and 20F are respectively compressors 21R and 21F, condensers 22R and 22F, dryers 23R and 23F, capillary tubes 24R and 24F as expansion valves, and coolers. It is formed by circulatingly connecting 25R and 25F (evaporator) with a refrigerant pipe. In actual installation, both condensers 22R and 22F are provided side by side, and one condenser fan 26 is shared. Further, on the refrigeration side, an accumulator 27 (liquid separator) may be provided on the outlet side of the cooler 25R.

When the refrigerating cycle is arranged on the refrigerator compartment 12R side as an example, as shown in FIG. 2, the heat insulating base 31 is provided so as to close the window hole 30 opened in the ceiling wall of the refrigerator compartment 12R. A refrigeration device 28R including a compressor 21R, a condenser 22R, and the like is placed on the base 31, and a cooler 25R is suspended and attached to the lower surface side.
On the other hand, an air duct 33 that also serves as a drain pan is stretched on the lower surface side of the window hole 30 in the ceiling portion of the refrigerator compartment 12R, thereby forming a cooler chamber 34. The cooler chamber 34 accommodates the cooler 25R described above, and a suction port 36 is provided on the front side (right side of the figure) of the air duct 33 and a cooling fan 37 is provided. Is provided with an outlet 38.
Therefore, when the cooling fan 37 is driven, the air in the refrigerating chamber 12R is sucked into the cooler chamber 34 from the suction port 36 and flows through the cooler 25R, as shown by the arrow in FIG. A circulating flow is generated such that it is blown out toward the refrigerator compartment 12R.
In addition, the arrangement structure of the refrigeration cycle 20F on the freezer compartment 12F side and the circulation and circulation mode of air are the same as those on the refrigerator compartment 12R side.

  The basic cooling control operation is performed as follows. As shown in FIG. 4, the control device 40 equipped with a microcomputer or the like is connected with internal temperature sensors 41R and 41F for detecting the internal temperature of the refrigerator compartment 12R and the freezer compartment 12F. 34 is arranged upstream of the coolers 25R and 25F. On the other hand, the internal set temperature TR, TF of the refrigerator compartment 12R and the freezer compartment 12F can be input by the internal preset temperature input section 42. For example, the refrigerator compartment 12R is “5 ° C.” and the freezer compartment 12F is “−”. "25 ° C".

On the refrigerator compartment 12R side, the cooling fan 37 is driven. On the other hand, as shown in the initial chart of FIG. 5, the temperature detected by the internal temperature sensor 41R is the internal set temperature TR (5 ° C.). When the upper limit value TR_u (5 ° C. + 2K = 7 ° C.) rises, the compressor 21R of the corresponding refrigeration cycle 20R is operated, and when it falls to the lower limit value TR_d (5 ° C.−2K = 3 ° C.) The compressor 21R is stopped, and this operation is repeated, so that the internal temperature of the refrigerator compartment 12R is substantially maintained at the set temperature TR (5 ° C.).
On the freezer compartment 12F side as well, the cooling fan 37 is driven, and when the temperature detected by the internal temperature sensor 41F rises to the upper limit value TF_u (−25 ° C. + 2K) of the internal set temperature TF, When the compressor 21F is operated and falls to the lower limit value TF_d (−25 ° C.−2K) of the internal set temperature TF, the compressor 21F is stopped, and this operation is repeated, so that the internal temperature of the freezer compartment 12F is increased. The temperature is substantially maintained at the set temperature TF (−25 ° C.).

In this embodiment, when the cooling control operation on the refrigerating room 12R side is performed, the stop time of the compressor 21R (the time from when the compressor 21R is turned off to when it is turned on again) tends to be long. Measures have been taken to shorten the stop time. In the present embodiment, the ambient temperature at the installation position of the refrigerator-freezer is selected as the condition.
Therefore, an ambient temperature sensor 45 that detects the ambient temperature is connected to the input side of the control device 40 that controls the operation and stop of the compressors 21R and 21F. As shown in FIG. 2, the ambient temperature sensor 45 is mounted on the outer surface of an electrical box 46 that houses the control device 40 and the like and is installed in the machine room 16.

  On the other hand, the control device 40 is provided with a correction unit 48 that corrects the upper limit value TR_u of the set temperature in the refrigerator compartment 12R downward when the detected temperature Ts of the ambient temperature sensor 45 is equal to or lower than a predetermined temperature. ing. Specifically, when the ambient temperature Ts is equal to or lower than “10 ° C.”, the upper limit value TR_u of the internal set temperature is corrected from “internal set temperature TR + 2K” to “internal set temperature TR + 1K”. ing. In addition, when the upper limit value TR_u of the internal set temperature is returned to “the internal set temperature TR + 2K”, the ambient temperature Ts is “15 ° C.” or more. This is to prevent malfunction.

Then, the effect | action of this embodiment is demonstrated.
The set temperature TR in the refrigerator compartment 12R is set to “5 ° C.”, and the set temperature TF in the freezer compartment 12F is set to “−25 ° C.”. On the freezer compartment 12F side, while the cooling fan 37 is continuously driven, when the temperature detected by the internal temperature sensor 41F rises to the upper limit value TF_u (−25 ° C. + 2K) of the internal set temperature, the corresponding refrigeration cycle is performed. When the compressor 21F of 20F is operated and falls to the lower limit value TF_d (−25 ° C.−2K) of the set temperature in the same compartment, the compressor 21F is stopped, and this operation is repeated, whereby the internal temperature of the freezer compartment 12F. Is substantially maintained at the set temperature (−25 ° C.).

  On the one refrigerator compartment 12R side, as shown in the timing chart of FIG. 5, when the ambient temperature Ts exceeds “10 ° C.” while the cooling fan 37 is continuously driven, However, when the internal temperature rises to the upper limit value TR_u (5 ° C. + 2K = 7 ° C.), the compressor 21R of the corresponding refrigeration cycle 20R is operated, and the lower limit value TR_d (5 ° C.−2K = When the temperature drops to 3 ° C., the compressor 21R is repeatedly stopped.

During this time, when it is detected that the ambient temperature Ts has decreased to “10 ° C.”, the correction unit 48 corrects the upper limit value TR_u of the internal set temperature to “internal set temperature TR + 1K”. Therefore, after that, when the internal temperature rises to the upper limit value TR_u (5 ° C. + 1K = 6 ° C.) of the internal set temperature, the compressor 21R of the corresponding refrigeration cycle 20R is operated and the lower limit of the internal set temperature is reached. If it falls to value TR_d (5 degreeC-2K = 3 degreeC), it will be repeated that the compressor 21R is stopped.
When the ambient temperature Ts rises to “15 ° C.”, the upper limit value TR_u of the internal set temperature is returned to “internal set temperature TR + 2K”.

As described above, in the period X in which the ambient temperature Ts is low in FIG. 5, that is, the period X from when the ambient temperature Ts drops below “10 ° C.” to when it rises to “15 ° C.” The upper limit value TR_u of the internal set temperature, which is the temperature at which switching from the stop to the restart, is lowered by “1K”. Therefore, if the upper limit value TR_u of the set temperature in the cabinet remains “5 ° C. + 2K = 7 ° C.”, the inside temperature reaches “7 ° C.” as shown by the characteristic line a of the chain line in FIG. Since the compressor 21R is turned on for the first time, when the stop time of the compressor 21R is Sa, the upper limit value TR_u of the internal set temperature is corrected to “5 ° C. + 1K = 6 ° C.”. As indicated by the solid characteristic line A in the figure, when the internal temperature reaches “6 ° C.”, the compressor 21R is turned on, and the stop time SA of the compressor 21R is shorter than the above. Become.
Thereby, the time for the inside of the refrigerator compartment 12R to be in a high humidity state is shortened, and condensation on the partition wall 11 with the freezer compartment 12F is suppressed. Therefore, the food stored in the refrigerator compartment 12R is prevented from getting wet and can be stored more hygienically.

  In addition, if each stop time of the compressor 21R is shortened by lowering the upper limit value TR_u of the internal set temperature as described above, for example, when viewed in units of one day, the total on of the compressor 21R is turned on. Although the time, ie, the cooling operation time becomes longer, the temperature in the refrigerating room 12R may be lowered by about 1 ° C. on average, but the stored food itself is not likely to drop by 1 ° C. It has been confirmed that there is no.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
In this embodiment, as a condition that the stop time of the compressor 21R (the time from when the compressor 21R is turned off to when it is turned on again) tends to be long, the load in the warehouse, that is, the amount of stored food is large. Assume the case. If the amount of food is large, the heat capacity of the entire refrigerating room 12R increases, so that it is difficult to increase after the temperature in the refrigerator once decreases, and as a result, the stop time of the compressor 21R becomes longer. In the present embodiment, the amount of the internal load is determined by directly viewing the stop time of the compressor 21R.

  Therefore, the control device 40A that controls the operation and stop of the compressors 21R and 21F includes, as shown in FIG. 6, each stop time S of the compressor 21R (from when the compressor 21R is turned off until it is turned on again). When the stop time S of the compressor 21R measured by the timer 50 is equal to or longer than a predetermined time, the upper limit value TR_u of the set temperature TR in the refrigerator compartment 12R is provided. A correction unit 51 is provided for correcting so as to correct downward. Specifically, when the stop time S of the compressor 21R becomes “1 hour” or longer, the upper limit value TR_u of the internal set temperature is corrected from “internal set temperature TR + 2K” to “internal set temperature TR + 1K”. It has become so. When the upper limit value TR_u of the internal set temperature is returned to “internal set temperature TR + 2K”, the stop time S is set to “30 minutes” or less. Similarly, this is to prevent malfunction.

The operation of the second embodiment is as follows.
The freezer compartment 12F side is maintained at substantially the set temperature TF (−25 ° C.) by performing the same cooling control operation as in the first embodiment.
On the refrigerator compartment 12R side, as shown in the timing chart of FIG. 7, in the state where the cooling fan 37 is continuously driven, the internal temperature of each compressor 21R is less than “1 hour” while the stop time S is less than “1 hour”. However, when the internal temperature rises to the upper limit value TR_u (5 ° C. + 2K = 7 ° C.), the compressor 21R of the corresponding refrigeration cycle 20R is operated, and the lower limit value TR_d (5 ° C.−2K = When the temperature drops to 3 ° C., the compressor 21R is repeatedly stopped.

During this time, when it is measured that the stop time S of the compressor 21R is equal to or longer than “1 hour”, the correction unit 51 corrects the upper limit value TR_u of the internal set temperature to “internal set temperature TR + 1K”. Therefore, after that, when the internal temperature rises to the upper limit value TR_u (5 ° C. + 1K = 6 ° C.) of the internal set temperature, the compressor 21R of the corresponding refrigeration cycle 20R is operated and the lower limit of the internal set temperature is reached. If it falls to value TR_d (5 degreeC-2K = 3 degreeC), it will be repeated that the compressor 21R is stopped.
When it is measured that the stop time S of the compressor 21R has become “30 minutes” or less, the upper limit value TR_u of the internal set temperature is returned to “internal set temperature + 2K”.

  As described above, in the period Y in which each stop time of the compressor 21R is long, here, in the period Y from when the stop time S becomes “1 hour” or more to “30 minutes” or less, the refrigerator compartment 12R side , The upper limit value TR_u of the in-compartment set temperature, which is the temperature at which the compressor 21R is switched from the stop to the restart, is lowered by “1K”. Therefore, if the upper limit value TR_u of the set temperature in the cabinet remains “5 ° C. + 2K = 7 ° C.”, the inside temperature reaches “7 ° C.” as shown by the characteristic line b of the chain line in FIG. Since the compressor 21R is turned on for the first time, the stop time of the compressor 21R becomes Sb. However, when the upper limit value TR_u of the internal set temperature is corrected to “5 ° C. + 1K = 6 ° C.”, FIG. As indicated by a solid characteristic line B, when the internal temperature reaches “6 ° C.”, the compressor 21R is turned on, and the stop time SB of the compressor 21R becomes shorter than the above.

As a result, as in the first embodiment, the time during which the inside of the refrigerating room 12R is in a high humidity state is shortened, and condensation on the partition wall 11 between the freezing room 12F is suppressed, and thus the refrigerating room 12R. The food stored in the container is prevented from getting wet and can be stored more hygienically.
In addition, since each stop time of the compressor 21R is shortened, the temperature in the refrigerating room 12R may be slightly lowered (about 1 ° C.) as the cooling operation time is increased when viewed in units of one day. However, it is the same as that described in the first embodiment that there is no risk that the quality of the food may be reduced.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) The ambient temperature is merely an example to correct the upper limit value of the internal set temperature exemplified in Embodiment 1, and can be arbitrarily set. In addition, the amount of decrease in the upper limit can be changed.
(2) The compressor stop time is only an example to correct the upper limit value of the in-compartment set temperature exemplified in Embodiment 2, and can be arbitrarily set. Similarly, the lowering range of the upper limit value can be changed.

(3) Furthermore, the present invention is not limited to the refrigerator-freezer exemplified in the above embodiment, and is a general cooling storage that is formed by dividing a plurality of storage chambers in the main body and can be cooled to different set temperatures. Applicable.

Front view of the refrigerator-freezer according to Embodiment 1 of the present invention. Longitudinal section showing the refrigerator compartment side Configuration diagram of refrigeration cycle Block diagram of compressor operation control mechanism Timing chart showing operation of compressor in refrigerator side The block diagram of the operation control mechanism of the compressor which concerns on Embodiment 2. FIG. Timing chart showing the operation of the compressor in the refrigerator compartment Graph showing the transition of the internal temperature according to the conventional example

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Main body 11 ... Partition wall 12R ... Refrigeration room (storage room with higher set temperature in the cabinet) 12F ... Freezer room 20R, 20F ... Refrigeration cycle 21R, 21F ... Compressor 25R, 25F ... Cooler 28R ... Refrigeration device 37 ... Cooling fan 40, 40A ... Control device 41R, 41F ... In-house temperature sensor 42 ... In-house temperature setting part 45 ... Ambient temperature sensor 48 ... Correction part (correction means) 50 ... Timer 51 ... Correction part (correction means)

Claims (2)

A plurality of storage chambers are formed by partitioning a heat insulating partition wall in the storage body consisting of a heat insulating box, and each storage chamber is independent by being circulated and connected to an individual refrigeration apparatus having a compressor. A cooler that constitutes the refrigeration cycle , a cooling fan, and an internal temperature sensor that detects the internal temperature are provided, and the internal set temperature that is different from each other is set.
In each storage room, when the detected temperature detected by the internal temperature sensor reaches the upper limit value of the corresponding internal set temperature, the cooling operation of the cooler is performed with the operation of the compressor of the corresponding refrigeration cycle , When the lower limit value of the internal temperature is reached , the internal temperature is maintained at the corresponding internal temperature by repeatedly stopping the cooling operation of the cooler as the compressor of the refrigeration cycle is stopped. In the cooling storage
An ambient temperature sensor for detecting the ambient temperature at the installation location of the cooling storage is provided,
When the detected temperature of the ambient temperature sensor is equal to or lower than a predetermined temperature, correction means is provided for correcting so as to lower the upper limit value of the internal set temperature only in the storage room having the higher internal set temperature. Characteristic cooling storage. A plurality of storage chambers are formed by partitioning a heat insulating partition wall in the storage body consisting of a heat insulating box, and each storage chamber is independent by being circulated and connected to an individual refrigeration apparatus having a compressor. A cooler that constitutes the refrigeration cycle , a cooling fan, and an internal temperature sensor that detects the internal temperature are provided, and the internal set temperature that is different from each other is set.
In each storage room, when the detected temperature detected by the internal temperature sensor reaches the upper limit value of the corresponding internal set temperature, the cooling operation of the cooler is performed with the operation of the compressor of the corresponding refrigeration cycle , When the lower limit value of the internal temperature is reached , the internal temperature is maintained at the corresponding internal temperature by repeatedly stopping the cooling operation of the cooler as the compressor of the refrigeration cycle is stopped. In the cooling storage
A timer for measuring the stop time of the cooling operation of the cooler in the storage room having the higher internal set temperature is provided,
When the measurement time of this timer is equal to or longer than a predetermined time, correction means is provided for correcting so as to lower the upper limit value of the internal set temperature only in the storage room having the higher internal set temperature. To cool storage.

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