KR0134876B1 - Constant temperature display - Google Patents

Abstract

The present invention relates to a constant temperature showcase for storing a side dish and the like by keeping the inside of a store at a predetermined constant temperature. The constant temperature showcase is equipped with cooling means for cooling and warming the reservoir, and a control fisheries for controlling the cooling means and the heating means in accordance with the detected temperature for detecting the ambient temperature so that the inside of the reservoir can always be maintained at a set temperature. have.

Description

Constant temperature showcase

1 is a side cross-sectional view showing a first embodiment of the present invention.

2 is a block diagram of an electric circuit according to the first embodiment.

3 is an explanatory diagram of energization control of a heating heater in the first embodiment.

4 is a flowchart of control in the first embodiment.

5 is a side cross-sectional view showing a second embodiment of the present invention.

6 is a block diagram of an electric circuit for the second embodiment.

FIG. 7 is an explanatory diagram of the energization control of the second heater in the second embodiment; FIG.

8 is a flowchart of control in the second embodiment.

* Description of the symbols for the main parts of the drawings *

1: Body 1a: Opening

3: partition plate 3a: ventilator

4: wind path 5: first vent opening

6: second vent 7: evaporator

8: heating heater 9: blowing fan

11: Product shelf 12: Fluorescent lamp

13 ambient temperature sensor 14 temperature sensor in storage

15 control unit 16 wind direction switching circuit

17: operation switching circuit 18: heater driving circuit

19: compressor 21: second heater

The present invention relates to a constant temperature showcase for storing a lunch box, side dishes, etc. by always maintaining a predetermined temperature in a store.

Conventionally, a constant temperature showcase is installed in a store such as a supermarket and always keeps a constant temperature in a store, and stores lunch boxes and side dishes. In this type of constant temperature showcase, a cooling means and a temperature sensor are installed in a main body. The cooling means is controlled in accordance with the temperature in the storage detected by this temperature sensor, so that the temperature in the storage is always kept at a constant temperature, for example, about 20 ° C in the case of side dishes, etc. In the case of the constant temperature showcase, the temperature in the store is always kept constant when the temperature in the store is higher than the constant temperature in the store.

However, the temperature in the store, i.e., constant temperature, for example, immediately after the opening of the store in winter or after closing, when the air conditioning system in the store is stopped or immediately after starting operation, or when cold air enters from the outside at the store entrance. When the ambient temperature of the showcase is lower than the temperature in the store, the temperature in the storeroom of the constant temperature showcase is lower than the predetermined constant temperature. Therefore, there is a problem that the quality of the stored article in the storage deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to provide a constant temperature showcase that can maintain a constant temperature at a constant temperature even if the ambient temperature is lower than a set temperature in the reservoir in view of such a problem.

In order to achieve the above object, the present invention provides a constant temperature showcase that maintains a temperature in a reservoir at a predetermined temperature, including cooling means for cooling the inside of the reservoir, heating means for warming the inside of the reservoir, and an ambient temperature detection sensor for detecting a temperature around the body. And control means for controlling the cooling means and the heating means based on the ambient temperature detected by the ambient temperature detection sensor.

Another constant temperature showcase that maintains the temperature in the reservoir at a set temperature includes cooling means for cooling the inside of the reservoir, heating means for warming the inside of the reservoir, an ambient temperature sensor for detecting the temperature around the body, and a temperature for detecting the temperature in the reservoir. And a storage means for controlling the cooling means and the warming means based on an ambient temperature detected by the storage temperature sensor, an ambient temperature detected by the ambient temperature detection sensor, and a temperature inside the reservoir detected by the storage temperature detection sensor.

Another constant temperature showcase constitutes a heating means by an electric heater while the control means includes a current carrying capacity changing means for changing a current carrying capacity of the electric heater according to the ambient temperature.

According to the present invention, the temperature around the main body is detected by the ambient temperature detection sensor, and the cooling means and the heating means are controlled by the control means in accordance with the ambient temperature. For example, the cooling means is operated when the ambient temperature is higher than the set temperature, and the heating means is operated when the ambient temperature is lower than the set temperature.

Further, according to the present invention, the temperature around the main body is detected by the ambient temperature detection sensor, and the temperature in the storage is hidden by the temperature detection sensor in the storage.

In addition, the cooling means and the heating means are controlled by the control means in accordance with the temperature of the ambient temperature in the reservoir. By this means, the cooling means is operated when the ambient temperature is higher than the set temperature, and the heating means is operated when the ambient temperature is lower than the set temperature. In addition, the cooling means and the heating means are controlled according to the temperature in the reservoir, so that the temperature in the reservoir is finely adjusted.

Further, according to the present invention, the electricity supply amount of the electric heater, which is the heating means, is changed by the electricity supply capacity change means of the control means, so that the temperature in the storage is maintained at the set temperature.

FIG. 1 is a side sectional view showing a first embodiment of the present invention, and FIG. 2 is a block diagram of an electric circuit for the first embodiment. In the drawing, reference numeral 1 denotes a main body of a constant temperature display case having an opening 1a on its front surface, and an air path 4 is formed by a partition plate 3 inside. One end side of the air passage 4 is connected to the first vent opening 5 formed at the upper portion of the opening 1a, and the other end side is connected to the second vent opening 6 formed at the lower portion of the opening 1a. In addition, an evaporator 7 serving as a cooling means, a heating heater 8 serving as a heating means, and a blower fan 9 capable of forward and reverse rotation by a polarity of an applied DC voltage are respectively defined below the inside of the air path 4. It is located at the location. In addition, a plurality of product shelves 11 and a plurality of product lighting fluorescent lamps 12 are installed in the storage, and a gap 11a having a predetermined width is formed between the product shelves 11 and the partition plate 3 on the back side. It is.

Reference numeral 13 denotes an ambient temperature sensor, which is composed of a dummyster or a transistor detecting element, which is provided on the front surface of the main body 1 to detect the ambient temperature T1 of the main body 1.

Reference numeral 14 denotes a temperature sensor in the storage, which is composed of a dummyster or a transistor detecting element, and is installed at a predetermined position in the storage to detect the temperature T2 in the storage.

The protection part 15 is a control part, which consists of a CPU, and outputs a wind direction switching signal to the wind direction switching circuit 16 mentioned later according to the ambient temperature T1, and an operation switching signal to the operation switching circuit 17 mentioned later, respectively. In addition, the controller 15 outputs the electric capacitance data to the heater driving circuit 18 which will be described later according to the ambient temperature T1 and the reservoir internal temperature T2. The value of the current carrying capacity data corresponds to the characteristic shown in FIG. In FIG. 3, the horizontal side shows the ambient temperature T1, and the new axis shows the output G1 of the heating heater 8. In FIG. That is, the first characteristic A represented by the formula (1) below and the second characteristic B represented by the formula (2) below are set in advance, and the first characteristic A and the second characteristic B are set according to the reservoir internal temperature T2. Is switched. In addition, according to these first and second characteristics A and B, the energization amount of the heating heater 8 is controlled so that the heater output G1 corresponding to the ambient temperature T1 is obtained.

G1 = -85.T1 + 1645 (W). … … … … … … … … … … … … … (One)

G1 = -57.T1 + 969 (W). … … … … … … … … … … … … … (2)

Reference numeral 16 is a wind direction switching circuit, which is made of a relay or the like, and inputs a wind direction switching signal from the control unit 15 to switch the polarity of the DC voltage applied to the blowing fan 9. That is, when a wind direction switching signal indicating the wind direction at the time of cooling operation is input, the direct current voltage is applied to the blower fan 9 to blow out the air in the wind path 4 from the first vent port 5, and at the same time the wind direction during the warming operation. When a wind direction switching signal is inputted, a DC voltage is applied to the blower fan 9 so as to blow air in the air path 4 from the second vent 6.

Reference numeral 17 denotes an operation switching circuit, which is composed of a relay or the like and inputs an operation switching signal from the controller 15 to supply power to the heater driving circuit 18 to be described later according to the input signal, and at the same time, the compressor 19 Turn on or off the power supply.

Reference numeral 18 is a heater driving circuit, and is composed of a relay, a resistor, an A / D converter, a transistor, and the like, and the control unit 15 causes a current to flow through the heating heater 8 in accordance with the input capacitance data.

Reference numeral 19 is a compressor, which is connected to a refrigerating circuit (not shown) including the evaporator 7 and is driven when power is supplied from the operation switching circuit 17.

The operation of the first embodiment having the above-described configuration will be described based on the control flowchart shown in FIG.

In the first embodiment, the temperature T2 in the reservoir is set to be maintained at approximately 20 ° C. That is, the controller 15 detects the ambient temperature T1 by the ambient temperature sensor 13 (S1), and determines whether the ambient temperature T1 is a preset temperature as the wind direction switching reference temperature, for example, 19 ° C or higher. (S2). As a result of this determination, when the ambient temperature T1 is 19 degreeC or more, the blowing fan 9 is driven in the wind direction at the time of cooling operation (S3). That is, the blower fan 9 is driven to blow out the air of the air path 4 from the first vent 5 as shown by the solid arrow in FIG. Moreover, when ambient temperature T1 is lower than 19 degreeC, the blowing fan 9 is comprised by the wind direction at the time of warming operation (S4). That is, as shown by the broken arrow in FIG. 1, the blower fan 9 is driven to blow out the air in the air path 4 from the second vent 6. Therefore, an air curtain flowing downward from the top during the cooling operation is formed in the opening 1a of the main body 1, and an air membrane flowing downward from the top during the warming operation is formed. Here the cool air is used to descend and the warm air to rise to form a good air film. In addition, through the vent hole 3a formed in the partition plate 3, cold air flows into the reservoir from the air passage 4 during the cooling operation, and in the warming operation, air heated from the upper portion of the reservoir is sucked into the air passage 4. At the same time, air flows up and down through the gap 11a. Therefore, the air flow in the reservoir becomes active, so that the inside of the reservoir can be efficiently cooled or warmed, and the temperature difference between the upper and lower sides in the reservoir can be reduced.

The control unit 15 determines whether or not the ambient temperature T1 is set to a reference temperature for starting the cooling operation, for example, 21 ° C. or higher (S5). As a result of this determination, when ambient temperature T1 is lower than 21 degreeC, S14 process mentioned later is implemented, and when it is 21 degreeC or more, the temperature T2 in a storage is detected through the temperature sensor 14 in a storage. Thereafter, it is determined whether or not the temperature T2 in the reservoir is set as the temperature at which the compressor 19 is driven, for example, moving to 20.2 ° C (S7).

As a result of this determination, when the temperature T2 in a reservoir is 20.2 degreeC or more, the compressor 19 is driven (S8), and the process of S11 mentioned later is performed. When the temperature T2 in the reservoir is lower than 20.2 ° C, it is determined whether or not the temperature T2 in the reservoir is a set temperature, for example, 19.8 ° C or lower, as the driving periodic temperature of the compressor 19 (S9). As a result of this determination, the drive of the compressor 19 is stopped when the temperature T2 in a reservoir is 19.8 degrees C or less (S10). Next, the ambient temperature T1 is detected (S11), and it is determined whether or not the ambient temperature T1 is set to a reference temperature for stopping the cooling operation, for example, lower than 19 ° C (S12). As a result of this determination, when the ambient temperature T1 is 19 ° C or more, the process S6 is executed. When the temperature is lower than 19 ° C, the drive of the compressor 19 is stopped (S13), and the process S1 is performed. The cooling operation is performed by the above-described S5-S12 processing, so that the temperature T2 in the reservoir is maintained at approximately 20 ° C.

As a result of the determination in S5, when the ambient temperature T1 is lower than 21 ° C, it is determined whether or not the ambient temperature T1 is set as a reference temperature for starting the warming operation, for example, 18 ° C (S14). As a result of this determination, when ambient temperature T1 is higher than 18 degreeC, the said S1 process is implemented, and when it is 18 degrees C or less, it energizes the heating heater 8 with a 1st characteristic A (S15).

Thereafter, the temperature T2 in the reservoir is detected (S16), and it is determined whether or not the temperature T2 in the reservoir is 20 degrees C or less (S17). The temperature of 20 ° C is set in advance as a reference temperature for switching the energization characteristic of the heating heater 8 from the second characteristic B to the first characteristic A. FIG.

As a result of the determination in S17, when the temperature T2 in the reservoir is 20 ° C or less, the heating heater 8 is energized with the first characteristic A (S18), and the S21 processing described later is performed. When the temperature T2 in the reservoir is higher than 20 ° C, it is determined whether or not the temperature T2 in the reservoir is 20.5 ° C or less (S19). This temperature of 20.5 ° C is set in advance as a reference temperature for switching the energization characteristic of the heating heater 8 from the first characteristic A to the second characteristic B. FIG.

As a result of the determination of S19, when the temperature T2 in the reservoir is 20.5 占 폚 or more, the heating heater 8 is energized with the second characteristic B (S20), and then the ambient temperature T1 is detected (S21). Subsequently, it is determined whether or not the ambient temperature T1 is set to a reference temperature at which the heating operation is stopped, for example, 19 ° C. or higher. As a result of this determination, when ambient temperature T1 is lower than 19 degreeC, S16 process is implemented, when it is 19 degreeC or more, electricity supply is stopped to the heating heater 8 (S23), and S1 process is performed. The heating operation is performed by the above-described processing of S16-S22, and the temperature T2 in the reservoir is maintained at approximately 20 ° C.

Next, a second embodiment of the present invention will be described.

FIG. 5 is a side sectional view showing the second embodiment, and FIG. 6 is a block diagram of an electric arc for the second embodiment. In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted. The difference between the second embodiment and the first embodiment is that in addition to the heating heater, the second heater 21 which is energized during the cooling operation is provided at a predetermined position below the air passage 4, and the compressor 19 is driven. The cooling operation is performed without stopping the pressure, thereby reducing the stress applied to the compressor 19.

In addition, the heater driving circuit 18 supplies a current to the heating heater 8 and the second heater 21 according to the electric capacitance data for each of the heating heater 8 and the second heater 21 input from the control unit 15. It is configured to send to.

The value of the electrostatic capacity data corresponding to the second heater 21 corresponds to the characteristic shown in FIG. In FIG. 7, the horizontal axis represents the ambient temperature T1 and the vertical axis represents the output G2 of the second heater 21.

That is, the first characteristic X represented by the formula (3) below, the second characteristic Y represented by the formula (4) below, and the third characteristic Z represented by the formula (5) below are preset, Any one of the first to third characteristics X, Y, and Z is selected according to the temperature T2 in the interior. In addition, according to the selected characteristic, the electricity supply amount is controlled by the second heater 21 so that the heater output G2 corresponding to the ambient temperature is obtained.

G2 = -25.T1 + 1060 (W). … … … … … … … … … … … … … (3)

G2 = -25.T1 + 969 (W). … … … … … … … … … … … … … (4)

G2 = -23.T1 + 800 (W). … … … … … … … … … … … … … (5)

The operation of the second embodiment having the above-described configuration will be described based on the control flow chart shown in FIG.

Also in the second embodiment, as in the first embodiment, the temperature T2 in the reservoir is maintained at approximately 20 ° C. That is, the control part 15 detects ambient temperature T1 (SP1), and determines whether ambient temperature T1 is 19 degreeC or more of wind direction switching reference temperature (SP2). As a result of this determination, when the ambient temperature T1 is 19 degreeC or more, the blowing fan 9 is driven in the wind direction at the time of cooling operation (SP3). When the ambient temperature T1 is lower than 19 ° C, the blowing fan 9 is driven in the wind direction during the warming operation (SP4). Thereafter, it is determined whether or not the ambient temperature T1 is 21 ° C. or higher, which is the reference temperature at which the cooling operation is started (SP5). As a result of this determination, when ambient temperature T1 is lower than 21 degreeC, the process of SP21 mentioned later is implemented, and when 21 degreeC or more is carried out, the drive of the compressor 19 is started (SP6), and the 2nd heater 21 by the 1st characteristic X is carried out. (SP7).

Next, the temperature T2 in the reservoir is detected (SP8), and it is determined whether or not the temperature T2 in the reservoir is higher than 21 ° C (SP9). As a result of this determination, when the temperature T2 in the reservoir is higher than 21 ° C, the second heater 21 is energized with the second characteristic Y (SP10), and the SP16 processing described later is executed. When the temperature T2 in the reservoir is 21 degrees Celsius or less, it is determined whether or not the temperature T2 in the reservoir is higher than 20.5 degrees Celsius (SP11). As a result of this determination, when the temperature T2 in the reservoir is higher than 20.5 ° C, the second heater 21 is energized with the third characteristic Z (SP12), and the process proceeds to the process of SP16 described later. As a result of the determination of SP11, when the temperature T2 in the reservoir is 20.5 占 폚 or lower, it is determined whether or not the temperature T2 in the reservoir is higher than 20 占 폚 (SP13). As a result of this determination, when the temperature T2 in the reservoir is higher than 20 ° C., the second heater 21 is energized with the second property Y (SP14), and the SP16 process described later is executed. When the temperature T2 in the reservoir is 20 ° C. or less, the second heater 21 is energized with the first characteristic X (SP15).

Thereafter, the ambient temperature T1 is detected (SP16), and it is determined whether or not the ambient temperature T1 is lower than 19 ° C, which is the reference temperature at which the cooling operation is stopped (SP17). As a result of this determination, when the ambient temperature T1 is 19 ° C. or higher, the above SP8 processing is executed. When the temperature is lower than 19 ° C., the energization of the second heater 21 is stopped (SP18) and the drive of the compressor 19 is stopped. (SP19), SP1 processing is executed. The cooling operation is performed by the above-described processing of SP5-SP17, so that the temperature T2 in the reservoir is maintained at approximately 20 deg. In this cooling operation, the heat generation amount is adjusted by the second heater 21 without controlling the compressor 19 to control the temperature T2 in the reservoir. Therefore, the load applied to the compressor 19 is prevented by turning on / off the drive of the compressor 19. Further, as the temperature T2 in the reservoir approaches 20 ° C, which is the set temperature, the current carrying capacity to the second heater 21 is lowered, thereby reducing power consumption.

As a result of the determination of SP5, when the ambient temperature T1 is lower than 21 ° C, it is determined whether or not the ambient temperature T1 is equal to or less than 18 ° C, which is the reference temperature at which the heating operation is started (SP20). As a result of this determination, when ambient temperature T1 is higher than 18 degreeC, SP1 process is implemented, and when it is 18 degrees C or less, it energizes the heating heater 8 with 1st characteristic A (SP21). Next, the temperature T1 in the reservoir is detected (SP22), and it is determined whether or not the temperature T2 in the reservoir is 20 degrees Celsius or less (SP23). This temperature of 20 DEG C is the same as in the first embodiment. This is set in advance as a reference temperature for switching the energization characteristic of the heating heater 8 from the second characteristic B to the first characteristic A. FIG.

As a result of the determination of SP23, when the temperature T2 in the reservoir is 20 ° C or less, the heating heater 8 is energized with the first characteristic (SP24), and the SP27 processing described later is executed. When the temperature T2 in the reservoir is higher than 20 ° C, it is determined whether or not the temperature T2 in the reservoir is 20.5 ° C or more (SP25). The temperature of 20.5 ° C is set in advance as a reference temperature for switching the energization characteristic of the heating heater 8 from the first characteristic A to the second characteristic B as in the first embodiment.

As a result of the determination of SP25, when the temperature T2 in the reservoir is 20.5 占 폚 or more, the heating heater 8 is energized with the second characteristic B (SP26). Thereafter, the ambient temperature T1 is detected (SP27), and it is determined whether or not the reference temperature at which the ambient temperature T1 stops the heating operation is 19 ° C or higher (SP28). As a result of this determination, when ambient temperature T1 is lower than 19 degreeC, SP22 process is implemented, when it is 19 degreeC or more, power supply of the heating heater 8 is stopped (SP29), and the said SP1 process is performed. The warming operation is performed by the above-described processing of SP22-SP28, so that the temperature in the reservoir is maintained at approximately 20 ° C.

Incidentally, in the first and second embodiments, a constant temperature display cabinet having an opening 1a in the front surface is provided. However, the present invention is not limited thereto, and in the first and second embodiments, the heating heater is based on the temperature T2 in the reservoir. 8), the operation of the second heater 21 and the compressor 19 is controlled to fine-tune the temperature T2 in the reservoir. However, the operation may be controlled only by the ambient temperature T1.

In the first and second embodiments, although the flow direction of the air in the air passage 4 is switched by the blowing fan 9 capable of forward and reverse rotation, two air blowing fans having different blowing directions in the air passage 4 are provided. One blower fan may be driven during the cooling operation, the other blower fan may be driven during the warming operation, and an air film flowing from the top to the bottom during the cooling operation and from the bottom to the top during the warming operation may be formed.

In addition, the same effect can be obtained even if the auxiliary heater is provided in the air path 4 and the current carrying capacity of each heater is changed so that the sum total of each heater output becomes the above-mentioned electricity supply characteristic.

Although the refrigerating circuit as the cooling means and the heating heater 8 as the heating means are used in the first and second embodiments, the present invention is not limited to this. For example, the same effect can be obtained when the cooling means and the warming means are constituted by using an electronic cooling element to heat or cool the air in the air path 4.

As described above, according to the present invention, when the temperature around the main body is lower than the set temperature, the heating means is operated so that the reservoir is heated, so that the temperature in the reservoir independent of the ambient temperature can always be maintained at the approximately set temperature. Therefore, the quality of the stored goods in the storage is not deteriorated.

In addition, according to the present invention, the operation of the cooling means and the heating means is controlled in accordance with the temperature in the reservoir detected by the temperature detection sensor in the reservoir, and the temperature in the reservoir is fine-adjusted, so that the temperature in the reservoir is not adjusted. The error of temperature can be made smaller.

In addition, according to the present invention, since the heating means is constituted by the electric heater together with the above-mentioned effect, it is possible to easily fine-tune the temperature in the reservoir by changing the current carrying capacity of the electric heater by the current carrying capacity changing means.

Claims (3)

A constant temperature showcase that maintains a temperature in a storage cell at a predetermined temperature, comprising: cooling means for cooling the inside of the storage, heating means for warming up, an ambient temperature sensor for detecting a temperature around the main body, and the ambient temperature detection sensor And a control means for controlling the operation of the cooling means and the heating means according to the ambient temperature. A constant temperature showcase that maintains a temperature in a reservoir at a predetermined temperature, comprising: cooling means for cooling the inside of the reservoir, heating means for warming up, an ambient temperature sensor for detecting a temperature around the main body, and a reservoir for detecting a temperature in the reservoir And a temperature detecting sensor and control means for controlling the operation of the cooling means and the warming means in accordance with the ambient temperature detected by the ambient temperature detection sensor and the temperature detected by the temperature detection sensor in the reservoir. Constant temperature showcase. 3. The constant temperature showcase according to claim 1 or 2, wherein the heating means comprises an electric heater, and the control means includes a current carrying capacity changing means for changing the current carrying capacity of the electric heater according to the ambient temperature.