JPS613969A - Cooling device for cooling storage warehouse - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention is a refrigerator, a freezer, and a refrigerated showcase.

This invention relates to a cooling device for a refrigerated storage such as a refrigerated showcase.

, Configuration of the conventional example and its problems The configuration of the conventional example will be explained below with reference to FIGS. 4 and 5, and a general refrigerated showcase will be used as a reference.

In the figure, 1 is the main body of the refrigerated showcase.

2 is a compressor. Reference numeral 3 denotes an evaporator installed inside the main body 1, which is vertically separated from the compressor 2 by a heat insulating wall 4. Reference numeral 5 denotes a first refrigerator fan motor, which is disposed on the side of the door 11 attached to the main body 1, and is attached near the evaporator 3. Reference numeral 6 denotes a second refrigerator fan motor which is disposed on the back side of the main body 1 away from the door 11, and is mounted near the evaporator 30 like the first refrigerator fan motor 2. The first internal refrigerator fan motor 5 and the second internal refrigerator fan motor 6 are separated from each other. Reference numeral 7 denotes a heat sensitive part of an automatic temperature controller 8 which detects the evaporator 30 filling level, and this heat sensitive part A is installed near the evaporator 3. 9 is a discharge port that discharges cold air into the main body 1.

1+The cold air discharged from the first refrigerator fan motor 5 is rectified at the discharge port 9, and then the cold air that comes out cools the products on the door side is also rectified at the discharge port 9 to cool the products on the back side of the refrigerator. After that, it is designed to return to the suction port 10 on the back side of the refrigerator.In other words, the discharge port 9 and the suction port 10 sandwich the door 11 in the front-rear direction (the direction opposite from the door 11 in FIG. 4). It extends to

Next, the air circuit will be described with reference to FIG. 6. An automatic temperature controller 8 is connected to a first refrigerator fan motor 5, a second refrigerator fan motor 6, and a compressor 2.

Next, the operation of the above conventional example will be explained.

When the heat sensitive part 7 reaches a preset temperature, the contacts of the automatic temperature controller 8 are opened and closed to operate the compressor 2, the first refrigerator fan motor 6, and the second refrigerator fan motor 6.
Alternatively, it was stopped and the temperature inside the refrigerator was maintained at the set temperature.

However, in the above conventional example, when the door 11 is opened (sometimes, the first refrigerator fan motor 6 and the second refrigerator fan motor 6 start or stop at the same time, the door 11 also leaks out of the main body 1. Therefore, the temperature inside the main body 1, which has been cooled over time, tends to rise.

Also, when cooling products on the back side of the main body 1, which is the opposite side to the door 11 side of the main body 1, the products on the door 11 side of the main body 1 are sold first. Therefore, it is necessary to cool the products on the door 11 side as well as the products on the back side.

However, conventionally, both the products on the door 11 side and the products on the back side of the main body 1 are cooled to the same temperature, so the products that are not taken out immediately are also cooled in the same way. There was a drawback that it took a long time and the stain cost was high.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples.
By efficiently operating the fan motor (for inside the refrigerator) and the fan motor for the second refrigerator, it reduces the outflow of cold air from the door 11 to the outside of the main body when the door is opened, and achieves an appropriate temperature distribution of the products inside the refrigerator. The purpose is to measure energy conservation by conducting

Structure of the Invention In order to achieve the above object, the present invention uses a control device that changes the rotation speed of a first refrigerator fan motor and a second refrigerator fan motor to set the temperature inside the refrigerator and open/close the door. The state is divided into a plurality of zones, and a frequency corresponding to each zone is generated by a digitally controlled frequency converter to operate the first refrigerator fan motor and the second refrigerator fan motor.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be explained below with reference to FIGS. 1 to 3.
The description will be made with reference to the drawings, but the same components as those of the conventional art will be given the same numbers and detailed description thereof will be omitted.

In the figure, reference numeral 12 denotes a first chamber temperature sensor, which is attached to the door 11 side of the suction port 10. Reference numeral 13 denotes a second internal temperature sensor, which is installed on the back side of the suction port 10 opposite to the door 11. A sensor 14 detects the open/closed state of the door 11 and is installed near the door 11.

The power source 16, automatic temperature controller 8, and compressor 2 are connected in series. Further, a first refrigerator fan motor 5 is connected to a first frequency converter 17 that is connected to a power source 16 . A second frequency converter 18 connected to the power source 16 also has a second
An internal fan motor 6 is connected. and a circuit of an automatic temperature controller 8 and a compressor 2, and a first frequency converter 1
7 and the circuit of the first refrigerator fan motor, and the second frequency converter 18 and the circuit of the second refrigerator fan motor are connected in parallel.

Then, the alternating current voltage of the power supply 16 is converted into direct current by the rectifier circuit 16 and applied to the first frequency converter 17 and the second frequency converter 18. This first frequency conversion device 1
The 7-sided frequency conversion device 18 continuously varies the output frequency according to a digital signal from a control device 19 equipped with a microcomputer, and converts the output frequency of the first refrigerator fan motor 6 and the second refrigerator fan motor 6. Change the rotation speed. The control device 19 receives data on the opening/closing state of the door 11 from the temperature sensor 7, the temperature sensor 12, and the sensor 4 which detects the opening/closing of the temperature door as input to the microcomputer. and,
The temperature setting conditions of the display operation unit 20 or the opening/closing status of the door 11 are subjected to logical operation processing based on a preset program, and the compressor 2 is operated, and the first frequency converter 17 and the second frequency converter are operated. A frequency setting signal is given to the device 18, and the display operation section 20 is caused to display the status of each section as long as necessary.

Next, an example of correspondence between the difference between the internal temperature and the temperature setting value and the frequency setting signal in the open/closed state of the door 11 will be shown.

First, temperature sensor 2. ! :The set temperature of temperature sensor 3 is set to be 3°C lower than that of temperature sensor 3. Here, the difference between the internal temperature and the temperature setting value is shown in a table (divided into six zones A to F).

Below, the margin, that is, the range 2°C or more higher than the temperature setting value is zone A, and the range 185°C to 2°0°C higher is zone B.1.
0″C~1.6°C high range is C zone, 0.5″C~
1.0℃ higher range is C zone, 0.0″C-0,rso
The range where C is high is the E zone, and the range below ○, o'C is the F zone. According to the above temperature difference, the first refrigerator fan motor 5 and the second refrigerator fan motor 6 are respectively operated. Therefore, the proper maximum frequency of the first refrigerator fan motor 5 and the second refrigerator fan motor 6 used for the BE zone is sequentially subtracted by determining a correction value for the BE zone. The F zone is set to stop.

Next, let the open state of the door 11 be the C zone, and the closed state be the H zone.For the H zone, use the states of A-F zones shown in "-". The seventh fan motor 5 is given an appropriate maximum frequency, and the second refrigerator fan motor 6 is stopped.

In this example, by using the refrigerator fan motor efficiently, the temperature inside the refrigerator can be quickly and efficiently lowered to the set temperature. The temperature inside the refrigerator can be maintained close to the set temperature, and when the door is opened, the rectified cold air on the door side is made to act as an air curtain.
The outflow of cold air from inside the refrigerator to the outside can be reduced.

Effects of the Invention The present invention has the above-described configuration, and provides the following effects.

(-) Operation near the temperature setting value is maintained at a constant temperature state close to the set temperature because the temperature state is input in detail.

(b) Since a device is made that functions as an air curtain even when the door is opened and closed frequently, the load on the cooling system is small and energy is saved.

(C) The cooling condition of the products in the refrigerator is set so that the products on the door side that are immediately taken out at the time of sale are properly cooled, and the products on the back side of the main unit that are not immediately taken out at the time of sale are set higher than the products on the door side. This eliminates unnecessary cooling and saves energy.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a refrigerated showcase according to the present invention, FIG. 2 is an electric circuit diagram of FIG. 4, FIG. 3 is a block diagram of the control circuit of FIG. 1, and FIG. 6 is a partially cutaway perspective view of a conventional refrigerated showcase, and FIG. 6 is an electrical circuit diagram of FIG. 4. 6... Fan motor for the first compartment on the door side, 6...
...Fan motor for the second compartment on the back side, 17...
Frequency conversion device for the first refrigerator fan motor 5, 18.
. . . Frequency conversion device for the second internal fan motor 6, 19 . . . Control device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Sen Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A digitally controlled frequency converter that changes the rotation speed of an internal fan motor by changing the frequency; and a control device that provides a frequency setting signal to the frequency converter based on the internal temperature and the opening/closing state of a door. A cooling device for a cooling storage, which comprises a plurality of internal fan motors that are operated at different frequencies according to preset frequencies depending on the internal temperature and the opening/closing state of the door.