JP2567764B2 - High humidity cooling storage - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-humidity cold storage for refrigerating and storing fresh foods in a high humidity condition.

[0002]

2. Description of the Related Art When storing fresh food such as meat, fresh fish, vegetables, etc., it is necessary to avoid drying and keep it at high humidity and by cooling, and conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 64-24993. A heat-conducting storage box is installed inside the heat-insulating box at intervals, with a duct inside this interval, and a refrigerating device is installed in the duct to circulate cold air in the duct, and the inside of the storage box from the wall of the storage box The high-humidity cooling storage cabinet is constructed so as to indirectly cool the storage room.

According to this structure, since cold air does not directly enter the storage box, the internal dehumidifying action is not performed, and the inside of the storage box is kept at high humidity due to water evaporated from food or water entering from the outside. , Thereby preventing food from drying,
It becomes possible to store in a high humidity state with cooling. In such a high-humidity cooled storage cabinet, the inside of the storage room is indirectly cooled.Therefore, if the sensor that detects the temperature inside the storage room directly controls the refrigeration system, the response becomes slow and the control becomes extremely unstable. Can't keep the temperature constant. Therefore, conventionally, the temperature in the storage chamber is displayed by the temperature display unit that detects and displays the temperature in the storage chamber, and the user sets the desired target temperature as the temperature of the storage chamber while looking at the temperature display unit. While configuring
Regarding temperature control, ignore the temperature inside the storage room, and install a sensor inside the duct to detect the temperature inside the duct.
Assuming a predetermined temperature setting value in the duct from the temperature difference between the inside of the duct and the storage room and the setting value by the user,
A method of controlling the refrigerating device by comparing the temperature set value in the duct with the output from the sensor by the control device to keep the temperature in the duct constant has been adopted.

FIG. 6 shows the temperature transition of each part of such a conventional high humidity cooling storage cabinet. In the figure, L1 is the temperature inside the storage chamber, L5 is the target temperature desired by the user as the temperature inside the storage chamber, L3 is the temperature inside the duct, and L4 is the temperature setting value inside the duct. In this case, the temperature set value L4 in the duct is assumed as a value lower than the target temperature L5 by a predetermined temperature by uniformly assuming a temperature difference between the inside of the duct and the storage chamber.

[0005]

However, the inside of the storage chamber is strongly affected by the outside air temperature due to the opening and closing of the door. That is, when the outside air temperature is higher than the temperature L3 in the duct, the temperature L1 in the storage chamber is higher than the temperature L3 in the duct. Conversely, when the outside air temperature is lower than the temperature L3 in the duct, the temperature L1 in the storage chamber is the duct. The temperature tends to be lower than the internal temperature L3. In addition, the influence of the outside air temperature on the storage room depends not only on the level of the outside air temperature itself but also on the heat insulation performance of the door and the number of times of opening and closing.Therefore, the temperature difference between the storage room and the duct is uniformly determined. If controlled in this manner, it becomes impossible to maintain the temperature inside the storage chamber at the temperature desired by the user as indicated by the difference between the target temperature L5 and the temperature L1 inside the storage chamber in FIG. Therefore, conventionally, the user sets the duct temperature set value L4, which is compared with the temperature L3 in the duct each time while the user watches the situation of the temperature L1 in the storage chamber displayed on the temperature display section.
Had to be changed to adjust the operation of the refrigeration system.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional technical problems and to provide a high-humidity cooling storage cabinet capable of automatically changing the duct internal temperature set value according to the temperature condition in the storage chamber.

[0007]

The high-humidity cooling storage cabinet of the present invention is provided with a heat-conductive storage box at a predetermined distance from the heat-insulating box, and the storage box serves as a storage chamber. And a cooling device for circulating the cool air in the duct, which is configured to indirectly cool the storage chamber by circulating the cool air in the duct. A control sensor that detects the temperature inside, a temperature sensor that detects the temperature inside the storage chamber, a temperature setting means that sets the temperature inside the storage chamber, a duct internal temperature based on the output of the control sensor, and a predetermined duct internal temperature. And a control means for controlling the refrigerating device by comparing the set value with the set value, and the control means controls the difference between the temperature inside the storage room based on the temperature sensor inside the storage room and the set value inside the storage room based on the temperature setting means. It is configured to change the duct temperature setpoint accordingly.

Further, according to the present invention, the control means samples the difference between the temperature in the storage chamber and the set value in the storage chamber, and brings the temperature in the storage chamber close to the set temperature in the storage chamber based on the value that changes depending on the sampling result for a predetermined period. It is configured to change the temperature setting value in the duct in the direction.

[0009]

The control means detects the temperature inside the duct on the basis of the output of the control sensor, and controls the refrigeration system by comparing it with the set temperature inside the duct. Further, the control means detects a difference between the temperature inside the storage room based on the output of the internal temperature sensor and the temperature inside the storage room based on the temperature setting means, and changes the temperature inside the duct based on the difference. As a result, the operating condition of the refrigerating apparatus is changed, the cooling capacity in the storage chamber is changed, and the temperature in the storage chamber is brought close to the set temperature in the storage chamber.

Further, the control means samples the temperature in the storage chamber and changes the set temperature in the duct according to the sampling result for a predetermined period. Therefore, the control does not become unstable due to the instantaneous fluctuation of the temperature in the storage chamber due to the opening and closing of the door.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram of a control device 40 as a control means of the high humidity cooling storage cabinet 1 of the present invention, FIG. 2 is a front view of the high humidity cooling storage cabinet 1 of the present invention, and FIG. 3 is a vertical sectional view of the high humidity cooling storage cabinet 1. Are shown respectively. 2 and 3, the high-humidity cooling storage cabinet 1 is constructed by accommodating and arranging a heat conductive storage box 3 at a predetermined interval inside a main body of a heat insulating box body 2 having an opening on the front surface. The storage box 3 is formed by screwing a heat conductive plate such as a steel plate and sealing the joint surface with a sealing material. The inside of the storage box 3 is vertically divided by a partition portion 4 and the upper storage room is upward. 5, a lower storage room 6 is formed below. The space between the storage box 3 and the heat insulating box 2 and the partition 4
The inside is a duct 8 as a series of cold air passages, and the inside of the duct 8 is divided by a dividing plate 9 into a discharge side duct 8A and a return side duct 8B.

A vertical strut 10 is attached to the front opening of the heat insulating box 2, and the opening is further divided into upper and lower parts in front of the partition part 4, and the front opening of the upper and lower storage chambers 5 and 6 partitioned by these is defined. A pair of upper and lower heat insulating doors 11, 11 and 12, 12 are openably closed. Top wall 2 of heat insulation box 2
A is provided with a rectangular window hole 14.
The mounting base 15 is attached so as to close the above. A compressor 17, a condenser 18, and a condenser fan 19 which constitute the refrigeration system 16 are provided on the upper surface of the mounting base 15.
Are installed, and the front of these is hidden by a grill 21 having a control panel 20 and the like. A cooler 22 constituting the refrigeration unit 16 is attached to the lower surface of the mounting base 15 and faces the duct 8 above the storage box 3. The fan 22 is formed on a fan cover (not shown) formed in a drain pan 23 below the cooler 22. Correspondingly, a cooling fan 24 is mounted in the duct 8 in front of the cooler 22.

When the cooling fan 24 is operated, the cooler 2
The cool air cooled in 2 is blown out to the discharge side duct 8A of the duct 8 as shown by the arrow in FIG. 3, flows down from the upper surface of the storage box 3 to the back, flows into the partition 4, and then makes a U-turn to form a lower back. To the return side duct 8
Circulation is carried out by flowing into B and raising the return duct 8B to return to the suction side of the cooler 22. The wall surface of the storage box 3 is cooled by the cold air circulation, and the storage boxes 3 and 5 are stored in the upper and lower storage chambers 5 and 6.
Cooled indirectly from the wall of

On the other hand, inside the column 10, an outside air introducing duct 26 communicating with the outside is formed at a communicating portion 25 at the front end of the ceiling wall 2A of the heat insulating box 2. The outside air introducing duct 26 communicates with the insides of the upper and lower storage chambers 5 and 6 and the outlets 27 and 28, respectively, from which outside air containing water is connected.
6, the structure is introduced as indicated by an arrow in the figure. As described above, the upper and lower storage chambers 5 and 6 receive indirect cooling from the wall surface of the storage box 3 and the outside air containing a large amount of water is introduced from the outside air introduction duct 26, so that the inside thereof is controlled by the control device 40 described later, for example. Cooling is maintained at a high humidity of 80% to 90% within a range of 5 ° C to + 13 ° C.

The upper surface of the storage box 3 is inclined rearwardly low, and a dew receiving plate 30 inclined along this inclination is arranged in the upper part of the upper storage chamber 5. In addition, a dew receiving plate 31 that is inclined rearward and low is disposed also in the upper part of the lower storage room 6,
A communication pipe 32 communicating with the upper and lower storage chambers 5 and 6 and opening above the dew receiving plate 31 is attached to the partition 4. Furthermore,
The storage box 3 at the bottom of the lower storage room 6 is provided with a drain passage 33 for discharging drain water.

In FIG. 1, the controller 40 is a one-chip C
Comprised of a microcomputer 41 composed of PU,
The outputs of a setting changeover switch 42 as a temperature setting means and a set value varying section 43 are input to the microcomputer 41, and a storage provided above the dew receiving plate 30 to detect the temperature in the upper storage chamber 5. Outputs of the internal temperature sensor 44 and the control sensor 45 provided on the suction side of the cooler 22 so as to detect the temperature in the return duct 8B are input via the sensor signal amplification section 46. The setting changeover switch 42 and the set value varying section 43 are arranged on the control panel 20. Also control panel 2
0 is provided with a temperature display unit 47, and this temperature display unit 47
Is connected to the output side of the microcomputer 41. On the output side of the microcomputer 41, the refrigerating device 16
An output relay 48 for controlling the energization of the compressor 17 is connected. Further, the microcomputer 41 includes a ROM 50 containing a program and a RAM 51 as a memory.
Built in.

Next, the operation of the microcomputer 41 will be described with reference to FIGS. In addition, in FIG.
1 is the temperature in the upper storage room 5, L2 is the set temperature in the storage room,
L3 indicates the temperature inside the duct 8, and L4 indicates the temperature set value inside the duct. The microcomputer 41 always displays the current temperature L1 in the upper storage compartment 5 on the temperature display unit 47 based on the output of the inside temperature sensor 44. When the user operates the setting changeover switch 42 from this state,
The microcomputer 41 switches to the setting mode,
Next, in the set value varying unit 43, for example, -5 ° C to +1 described above.
A desired storage chamber temperature set value L2 is set within the range of 3 ° C. This setting mode is canceled after a predetermined time, but during the setting mode, the microcomputer 41 displays the setting value L2 on the temperature display section 47, and otherwise displays the temperature L1 in the upper storage chamber 5.

The microcomputer 41 itself determines the initial value of the duct internal temperature set value L4 based on the storage chamber temperature set value L2 set as described above, for example, with a predetermined temperature difference, and the duct internal temperature set value is set. The temperature L3 in the duct 8 based on the control sensor 43 is compared with L4, and the output relay 48 is turned on and off between a predetermined upper limit temperature and a lower limit temperature to control the operation of the compressor 17 to stop the duct. The temperature L3 in 8 is averaged and controlled to the duct internal temperature set value L4.

On the other hand, the microcomputer 41 samples the temperature L1 in the upper storage chamber 5 once every 3 seconds based on the output of the internal temperature sensor 44, and once every 3 minutes, 30 times before that (that is, 1). The temperature L1 of the sampling result (up to 30 seconds before the minute) is averaged to calculate the average temperature L10,
The difference (L10-L2) between the average temperature L10 and the set value L2 for the temperature inside the storage chamber is calculated to derive the deviation, and the deviation is R
It is stored in AM51. One bar in FIG. 4 shows the deviation for one time. This deviation is stored in the RAM 51 for 10 times, and the sum total of 10 deviations is calculated once every 30 minutes (T). In the case of the example in FIG. 4, the outside air temperature is high, the average temperature L10 of the temperature L1 in the upper storage chamber 5 is higher than the storage chamber temperature set value L2, and the total deviation is + 15 ° C.

Further, the microcomputer 41, for example, when the sum of the deviations is + 20 ° C. or more, the duct temperature setting value L4 is −2 ° C., and the sum of the deviations is + 10 ° C. or more +19.
When the temperature is equal to or lower than 0 ° C, the duct temperature setting value L4 is changed from the current value by -1 ° C. In addition, the sum of deviations is -9 ° C or more +
When the temperature is 9 ° C. or lower, the duct temperature set value L4 is not changed. Further, when the total deviation is −19 ° C. or higher and −10 ° C. or lower, the duct internal temperature setting value L4 is + 1 ° C., and when the total deviation is −20 ° C. or lower, the duct internal temperature setting value L4 is +2.
Change from the current value only in ° C.

The state of this control will be described with reference to FIG. In the case of the example in FIG. 4, since the total deviation is + 15 ° C., the microcomputer 41 sets the duct internal temperature setting value L4 to −1 from the current setting value at the time t when the total deviation is found from the above control. Change only ℃. That is, the set temperature L4 in the duct is lowered by 1 ° C. As a result, the temperature L3 in the duct decreases, so that the storage box 3 is cooled more strongly, and as shown in FIG. 5, the temperature L1 of the upper storage chamber 5 also decreases to the storage chamber temperature set value L2. Go closer.

On the contrary, when the sum of the deviations is a (-) value, the temperature L3 in the duct is increased by changing the temperature set value L4 in the duct to the (+) direction, and the temperature in the upper storage chamber 5 is increased. It operates so as to raise L1 and bring it closer to the set temperature L2 in the storage chamber. Therefore, when the outside air temperature is low such as at night, the duct internal temperature setting value L4 is increased to control the operation rate of the compressor 17, which contributes to energy saving.

Further, as described above, the average temperature L10 of the temperature L1 in the upper storage chamber 5 is derived every 3 minutes, and the difference between the average temperature L10 and the storage chamber temperature set value L2 is defined as a deviation. Since the internal temperature set value L4 is changed, the door 11
The temperature becomes less likely to be affected by the instantaneous fluctuation of the temperature L1 in the upper storage chamber 5 due to the opening and closing of the control chamber, and the control is stabilized. Furthermore,
The microcomputer 41 integrates the operating time of the compressor 17, and defrosts the cooler 22 when a predetermined time is reached. For example, one hour after the start of defrosting, the duct internal temperature set value L4 is set. The change control of No. is not performed, and the data at the start of defrosting is retained. This distinguishes the temperature rise in the upper storage chamber 5 due to the defrosting of the cooler 22 from the temperature rise in the upper storage chamber 5 due to the change in the outside air temperature, and the control becomes unstable due to the temporary temperature fluctuation due to the defrosting. Are prevented.

The data on the deviation in the RAM 51 is cleared after the operation of changing the duct internal temperature set value L4, and the sampling is started again. Further, the sampling timing of the temperature L1 in the upper storage chamber 5, the interval for calculating the deviation, and the period for calculating the average value by the microcomputer 41 are not limited to those in the embodiment, and can be appropriately changed according to the performance of the device. is there.

[0025]

According to the high humidity cooling storage of the present invention, the temperature in the duct and the temperature set value in the duct are compared to control the refrigerating device, and the temperature in the storage chamber is adjusted according to the difference between the temperature in the storage chamber and the set value in the storage chamber. By changing the duct internal temperature setting value, it is possible to bring the temperature inside the storage room closer to the set value regardless of changes in the outside air temperature, etc., and improve the temperature control performance in the storage room of the indirect cooling type high humidity cooling storage cabinet. Can be made.

Further, by changing the temperature setting value in the duct according to the sampling result of the temperature inside the storage chamber for a predetermined period, it is possible to prevent the control from becoming unstable due to the instantaneous change in the temperature inside the storage chamber due to the opening and closing of the door. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a block diagram of a controller for a high-humidity cooled storage according to the present invention.

FIG. 2 is a front view of the high-humidity cooling storage cabinet of the present invention.

FIG. 3 is a vertical cross-sectional view of the high-humidity cold storage of the present invention.

FIG. 4 is a diagram illustrating a sampling operation of temperature in the upper storage chamber of the control device.

FIG. 5 is a diagram showing a temperature transition of each part under the control of the control device.

FIG. 6 is a diagram showing a temperature transition of each part of a conventional high humidity cooling storage cabinet.

[Explanation of symbols]

 1 High-humidity cooling storage cabinet 2 Insulation box body 3 Storage box 5 Upper storage room 6 Lower storage room 8 Duct 16 Refrigerator 17 Compressor 40 Control device 41 Microcomputer 42 Setting change switch 43 Set value varying unit 44 Internal temperature sensor 45 Control sensor

Claims (2)

(57) [Claims] 1. A heat-conductive storage box is provided in the heat-insulating box at a predetermined distance from the heat-insulating box, a storage chamber is formed in the storage box, and the space is a duct. In a high humidity cooling storage configured to indirectly cool the storage chamber by circulating cold air in the refrigeration device for circulating cold air in the duct, and a control sensor for detecting the temperature in the duct. Comparing the inside temperature sensor for detecting the temperature inside the storage chamber, the temperature setting means for setting the temperature inside the storage chamber, and the temperature inside the duct based on the output of the control sensor with a predetermined temperature inside the duct. And a control means for controlling the refrigerating apparatus, wherein the control means is a difference between a temperature inside the storage chamber based on the temperature sensor inside the storage and a temperature inside the storage room set based on the temperature setting means. A high-humidity cooling storage cabinet, wherein the set temperature in the duct is changed according to the above. 2. The control means samples the difference between the temperature in the storage chamber and the set value in the storage chamber, and based on a value that changes according to the sampling result for a predetermined period, the temperature in the storage chamber approaches the temperature set value in the storage chamber. The high-humidity cooling storage cabinet according to claim 1, wherein the set temperature in the duct is changed.