JPH08166184A - Refrigerating equipment with freezing function - Google Patents

Abstract

PURPOSE: To radiate heat sufficiently and thereby to prevent lowering of a freezing capacity even when a dew formation preventing condenser is bypassed, by providing a bypass condenser on the lateral or back side of an outer box. CONSTITUTION: A condenser circuit connecting a dew formation preventing condenser 11 which is provided as a piping continuously in the periphery of the front of an outer box 1 of refrigerating equipment wherein a door is provided so that it can be opened and closed, and through which a refrigerant flows, is provided and a temperature sensor 14 and a humidity sensor are provided for the outer box, while a bypass condenser 12 through which a refrigerant flows, bypassing the dew formation preventing condenser 11, is provided as a piping for the condenser circuit, on the lateral side of the outer box 1, and a solenoid valve 13 opening and closing the bypass condenser 12 is provided. When an ambient temperature measured by the temperature sensor 14 is higher than a dew formation preventing temperature, the solenoid valve 13 is closed and the refrigerant is made to flow through the bypass condenser 12. When the ambient temperature is lower than the dew formation preventing temperature, the solenoid valve 13 is opened and the refrigerant is made to flow through the dew formation preventing condenser 11 so as to prevent dew formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of dew formation of a refrigerating machine with a freezing function having a freezing function such as a refrigerator or a showcase.

[0002]

2. Description of the Related Art An example of a conventional refrigerating apparatus with a freezing function, for example, a freezer-refrigerator will be described with reference to FIG. FIG. 7 is a schematic configuration diagram showing a capacitor circuit and related portions in which a refrigerant compressed by a compressor flows.

In a conventional refrigerator-freezer, a compressor 42 is provided at the bottom of the back of an outer box 41 which constitutes the refrigerator body, and the compressor 4
An evaporator 47 is connected to 2 via a dryer 43, a fluid valve 44, a capillary tube 45, and a refrigerant pipe 46. Then, a bottom condenser 50 having a heat exchange fin 49 for promoting heat dissipation of the refrigerant by blowing air from a condensing fan 48 provided at the bottom of the outer box 41 is connected to the compressor 42, and the bottom condenser 50 is connected to the bottom condenser 50. A detouring condenser 52, which is connected to a dew condensation preventing condenser 51 connected continuously around the front surface of the outer casing 41 where the door is openable and closable, and which bypasses the dew condensation preventing condenser 51 provided at the bottom of the outer casing 41. And a solenoid valve 53, which is an opening / closing mechanism for switching the flow of the refrigerant, is provided at either of the bypass condenser 52 and the dew condensation preventing condenser 51 at the connection portion between the bypass condenser 52 and the dew condensation preventing condenser 51. .

The compressor 42 and the bottom condenser 5
And the temperature sensors 54, 55, 56, 57, and 58, which are ambient temperature measuring devices, on the respective front portions of the outer casing 41, and the outer casing 41 is shown in the drawing. Not provided with a humidity sensor that is an ambient humidity measuring device. Incidentally, 59 is the temperature sensor 54, 5
Reference numeral 50 is a connection line for connecting 5, 56, 57 and 58 to a control unit (not shown), and reference numeral 50 is a connection line for connecting the humidity sensor to the control unit.

In the refrigerator-refrigerator having the above-described structure, the control unit calculates the dew-prevention temperature based on the measurement results of the temperature sensors 54, 55, 56, 57, 58 and the humidity sensor, and the temperature sensors 54, 55, 56, 57. , 58 when the measured temperature is higher than the calculated dew-prevention temperature, it is not necessary to prevent dew-deposition, so the solenoid valve 53 is closed and the dew-condenser 52 is caused to flow into the dew-prevention condenser 51. The temperature rise on the front side of the outer box 41 is eliminated without flowing the heat to prevent heat from entering the refrigerator. Further, when the measured temperature is lower than the dew-prevention temperature, it is necessary to prevent the dew-deposition. Therefore, the solenoid valve 53 is opened, and the refrigerant is flown through the dew-prevention preventing condenser 51 to prevent the dew-dewing.

[0006]

In the case of the refrigerator having the above-described structure, when the dew condensation prevention is not required, the refrigerant is passed through the detour condenser to bypass the dew condensation prevention condenser. The heat dissipation capability is much smaller than that of the dew-prevention capacitor, and the temperature of the refrigerant does not decrease and the condensing temperature rises, so there is a problem that the freezing capacity of the refrigerator-freezer decreases.

The refrigerating apparatus with a refrigerating function of the present invention has been made to solve the above-mentioned problems, and by installing a bypass capacitor on the side surface or the back surface of the outer box, the dew condensation preventing capacitor can be sufficiently bypassed. The purpose of this is to prevent a decrease in the refrigerating capacity by performing effective heat radiation.

[0008]

In order to achieve the above object, the refrigerating apparatus with a refrigerating function according to the present invention as set forth in claim 1 is continuous around the front surface of the refrigerating apparatus, in which a door of an outer box is provided so as to be openable and closable. A condenser circuit that connects a dew condensation preventing condenser is installed in the middle of a heat dissipation condenser that is compressed by a compressor and flows through the refrigerant, and an ambient temperature measuring device and an ambient humidity measuring device are provided in the outer box. A calculation that calculates the dew condensation prevention temperature based on the measurement results of the ambient temperature measuring device and the ambient humidity measuring device by piping a detouring capacitor that bypasses the dew condensation preventing capacitor and flowing a refrigerant and providing an opening / closing mechanism for opening and closing the detouring capacitor. Means is provided, and when the measured temperature of the ambient temperature measuring device is higher than the dew prevention temperature, the opening / closing mechanism is closed, and the measured temperature of the ambient temperature measuring device is raised. It is lower than the anti temperatures provided a bypass control means for opening the opening and closing mechanism, and the piping on the side surface or rear surface of the outer box and the bypass capacitor.

According to a second aspect of the present invention, there is provided a refrigerating apparatus with a refrigerating function, the heat radiating condenser includes the dew condensation preventing condenser, the detour condenser, and a heat exchange fin for promoting heat radiation of the refrigerant by blowing air from a condensing fan. The bottom capacitor is provided, and the bypass capacitor is provided integrally with the bottom capacitor.

The refrigerating apparatus with a refrigerating function according to a third aspect of the present invention is provided with a control section for increasing the rotation speed of the condensing fan when the flow of the refrigerant is switched to the bypass condenser side by the opening / closing mechanism.

[0011]

In the refrigerating apparatus with a refrigerating function according to the first aspect of the present invention, when the dew condensation prevention is not required, the bypass control means closes the opening / closing mechanism to supply the refrigerant to the bypass condenser piped on the side surface or the back surface of the outer box. Shed. At this time, since the bypass capacitor is piped on the side surface or the back surface, the heat dissipation capability of the bypass capacitor is not lowered and the refrigerant is radiated as usual.

Further, in the refrigerating apparatus with a refrigerating function according to the second aspect of the invention, when dew condensation prevention is not required, the bypass control means closes the opening / closing mechanism to supply the refrigerant to the bypass condenser provided integrally with the bottom condenser. Shed. At this time,
Since the bypass capacitor is provided integrally with the bottom capacitor, the heat dissipation capability of the bypass capacitor is not lowered, and the refrigerant is radiated as usual.

Further, in the refrigerating apparatus with a refrigerating function according to the third aspect, when the dew condensation prevention is not required, the detour control means closes the opening / closing mechanism to supply the refrigerant to the detour condenser provided integrally with the bottom condenser. As it flows
The number of rotations of the condensing fan is increased, and the heat radiation capability of the bypass condenser is not reduced, and the heat radiation of the refrigerant is performed as usual.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a refrigerating apparatus with a freezing function of the present invention, for example, a refrigerator-freezer, will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram showing a condenser circuit and related parts in which a refrigerant compressed by a compressor flows, and FIG. 2 is a flow chart for explaining an operation of a refrigerator-freezer.

The refrigerator-freezer of the present invention is provided with a compressor 2 at the bottom of the back surface of an outer box 1 which constitutes the refrigerator main body.
An evaporator 7 is connected via a dryer 3, a fluid valve 4, a capillary tube 5 and a refrigerant pipe 6. Then, the compressor 2 is connected to a bottom condenser 10 having a heat exchange fin 9 for promoting heat dissipation of the refrigerant by blowing air from a condensing fan 8 provided at the bottom of the outer box 1,
The bottom condenser 10 is connected to a dew condensation preventing condenser 11 which is continuously piped around the front surface of the outer box 1 in which the door of the outer box 1 is openable and closable, and the dew condensation piped on the side surface (or rear surface) of the outer box 1 is connected. A bypass capacitor 12 that bypasses the prevention capacitor 11 is connected, and the bypass capacitor 1 is connected to a connection portion between the bypass capacitor 12 and the dew condensation prevention capacitor 11.
An electromagnetic valve 13, which is an opening / closing mechanism that switches the flow of the refrigerant, is provided on either one of the 2 and the dew condensation preventing capacitor 11.

The compressor 2 and the bottom condenser 10
The condensing fan motor 8 is provided between the temperature sensor 1 and the temperature sensor 1 which is an ambient temperature measuring device on each part of the front surface of the outer box 1.
4, 15, 16, 17, 18 are provided, and a humidity sensor which is an ambient humidity measuring device (not shown) is provided in the outer box 1. Incidentally, 19 is the temperature sensor 14, 15, 1
Reference numeral 6, 17 and 18 are connection lines for connecting to a control unit (not shown), and 20 is a connection line for connecting the humidity sensor to the control unit.

The refrigerator / refrigerator having the above-mentioned structure controls the temperature sensor 14, 15, 16, 17, 18 and the humidity sensor, that is, the control unit based on the temperature (opening and closing temperature) around the front surface of the outer box 1 and the ambient humidity. Calculates the dew-prevention temperature, and when the measured temperature measured by the temperature sensors 14, 15, 16, 17, 18 is higher than the calculated dew-prevention temperature, it is not necessary to prevent the dew-release, so the solenoid valve 13 is closed. By flowing the refrigerant to the bypass condenser 12, the refrigerant does not flow to the dew condensation preventing condenser 11 to prevent the temperature rise on the front side of the outer box 1 and prevent the heat from entering the refrigerator. At this time, since the bypass condenser 12 is piped on the side surface of the outer casing 1, the refrigerant flowing through the bypass condenser 12 can be sufficiently radiated, and the condensing temperature of the refrigerant does not rise, so that Freezing (refrigerating) can be performed without reducing the freezing (refrigerating) capacity.

If the measured temperature is lower than the dew condensation prevention temperature, it is necessary to prevent dew condensation. Therefore, the solenoid valve 13 is opened and a refrigerant is passed through the dew condensation prevention condenser 11 to prevent dew condensation.

Next, a second embodiment of the refrigerator-freezer of the present invention will be described with reference to FIG. FIG. 3 is a schematic configuration diagram showing a capacitor circuit and related parts in which a refrigerant compressed by a compressor flows, and the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In the second embodiment of the refrigerator / freezer of the present invention, the bypass condenser 21 is integrally provided with the bottom condenser 22 provided at the bottom of the outer box 1.
2 (the size of the heat-radiating fin 9) to the first
By making the bypass capacitor 21 and the bottom capacitor 22 integral with each other by making them larger than the bottom capacitor of the embodiment, a decrease in heat dissipation capability is prevented.

As described above, by forming the bypass capacitor 21 and the bottom capacitor 22 integrally, the bypass capacitor 21 is piped to the side surface or the back surface of the outer box 1 only by increasing the size of the bottom capacitor 22. It is possible to secure the same heat dissipation capacity as that of the detour capacitor, to eliminate the bypass capacitor that is installed on the side surface or the bypass capacitor that is installed on the back surface, and the structure of the bypass capacitor can be made simple and small, reducing the cost. Can be planned.

A third embodiment of the refrigerator / freezer of the present invention will be described with reference to FIGS. 4 to 6. FIG. 4 is a schematic configuration diagram showing a condenser circuit and related parts in which a refrigerant compressed by a compressor flows, FIG. 5 is a block diagram of a control circuit of a refrigerator / freezer of the present invention, and FIG. 6 is a flow chart for explaining the operation of the refrigerator / freezer. Therefore, the same parts as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

In the third embodiment of the refrigerator / freezer of the present invention, the bypass condenser 23 is integrally provided with the bottom condenser 24 provided at the bottom of the outer box 1.
4 (the size of the heat radiation fin 9) to the above second
It is formed smaller than the bottom capacitor of the embodiment.
Then, as shown in FIG. 5, the temperature sensors 14, 15, 1
6, 17, 18 and the humidity sensor 25 to the A / D converter 26
And a microcomputer (hereinafter, referred to as a microcomputer) 27 having a program ROM, a data RAM, and an ALU, which is a control unit, is connected to the A / D converter 26, and a reference for generating a reference clock signal to the microcomputer 27 is connected. The clock oscillator circuit 28 is connected, and the switching power supply unit 30 which is a power unit for driving the fan motor 29 of the condensing fan 8 is also connected.

The fan motor 29 is a DC brushless motor, and the number of revolutions thereof can be changed by changing the input voltage.

The microcomputer 27 uses the temperature sensors 14, 1
5, 16, 17, 18 and the dew-prevention temperature are calculated from the temperature and humidity measured by the humidity sensor 25, and the opening / closing of the solenoid valve 13 is controlled based on the calculated dew-prevention temperature and the measured ambient temperature. When the electromagnetic valve 13 is closed and the refrigerant is allowed to flow through the bypass condenser 23, the rotation number of the fan motor 29 of the condenser fan 8 is controlled to be increased.

The operation of the refrigerator / refrigerator having the above structure will be described. The measurement results of the temperature sensors 14, 15, 16, 17, 18 and the humidity sensor 25, that is, the temperature around the front surface of the outer box 1 (opening / closing temperature) and the ambient humidity. Based on the above, the microcomputer 27 calculates the dew-prevention temperature, and the temperature sensors 14, 15, 16,
When the measured temperature (switching part temperature) measured at 17, 18 is higher than the calculated dew-prevention temperature, it is not necessary to prevent dew-deposition, so the solenoid valve 13 is closed and a refrigerant is passed through the bypass condenser 23. Dew condensation prevention capacitor 11
The temperature rise on the front side of the outer box 1 is prevented by not flowing the refrigerant to the inside of the refrigerator to prevent heat from entering the refrigerator. At this time, when the solenoid valve 13 is closed, the microcomputer 27 controls to increase the rotation speed of the fan motor 29, so that the switching power supply unit 30 supplies a DC voltage of 16V to the fan motor 29.
Is applied and the rotation speed of the fan motor 29 is set to 320
By driving at a rotation speed of 0 rpm and increasing the amount of cooling air (arrow a in FIG. 3) blown to the bottom condenser 24, the heat dissipation capability of the bottom condenser 24 is improved and the detour condenser 23 Dissipate the heat of the refrigerant flowing through, without increasing the condensation temperature of the refrigerant.
Freezing (refrigerating) can be performed without lowering the freezing (refrigerating) capacity of the refrigerator.

If the measured temperature is lower than the dew-prevention temperature, it is necessary to prevent the dew-release.
To open the solenoid valve 13 to open the dew condensation prevention capacitor 11
Dew is prevented by flowing a refrigerant through. At this time, when the solenoid valve 13 is opened, the refrigerant does not flow to the bypass condenser 23 but only to the bottom condenser 24. Therefore, the microcomputer 27 controls to reduce the rotation speed of the fan motor 29. . Therefore, the switching power supply unit 30 applies a DC voltage of 12 V to the fan motor 29, and the rotation speed of the fan motor 29 is set to 2300 r.
Driving is performed at a rotational speed of pm.

As described above, when the solenoid valve 13 is closed, the rotation speed of the fan motor 29 is increased and the amount of cooling air to the bottom condenser 24 is increased to prevent the heat dissipation ability from decreasing. , The bottom capacitor 2
Even if 4 and the bypass capacitor 23 are integrally provided, it is not necessary to increase the size of the bottom capacitor 24, and the size of the bottom capacitor 24 can be reduced.

[0029]

According to the refrigerating apparatus with a refrigerating function of the present invention of claim 1, when dew condensation prevention is not required, the detour control means closes the opening / closing mechanism to form a detour condenser connected to the side surface or the back surface of the outer box. Since the refrigerant is flowing, even if the flow of the refrigerant in the bypass condenser side is switched, the refrigerant equivalent to that in the case where the refrigerant is allowed to flow in the dew condensation preventing condenser without degrading the heat dissipation capability of the bypass condenser is used. A heat dissipation effect can be obtained, and favorable freezing (refrigeration) can be performed without lowering the freezing (refrigeration) capacity of the refrigerating device.

Further, in the refrigerating apparatus with a refrigerating function according to the second aspect of the invention, since the bypass capacitor is integrally provided with the bottom capacitor, it is possible to obtain a sufficient heat dissipation ability by only slightly increasing the size of the bottom capacitor. The bypass capacitor can be downsized with a simple structure, the cost can be reduced, and the assembling efficiency can be improved.

In the refrigerating apparatus with a refrigerating function according to a third aspect of the present invention, when the refrigerant flows through the bypass condenser provided integrally with the bottom condenser, the rotation speed of the condensing fan is increased to increase the amount of cooling air. Since a small bottom capacitor can provide sufficient heat dissipation capability, the bottom capacitor can be downsized, and the refrigeration system can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a condenser circuit and related portions in which a refrigerant compressed by a compressor flows in a first embodiment of a refrigerator-freezer of the present invention.

FIG. 2 is a flowchart explaining the operation of the first embodiment of the refrigerator-freezer of the present invention.

FIG. 3 is a schematic configuration diagram showing a condenser circuit and related portions in which a refrigerant compressed by a compressor flows in a second embodiment of a refrigerator-freezer of the present invention.

FIG. 4 is a schematic configuration diagram showing a condenser circuit and related portions in which a refrigerant compressed by a compressor flows in a third embodiment of a refrigerator-freezer of the present invention.

FIG. 5 is a block diagram showing a control circuit of a third embodiment of the refrigerator-freezer of the present invention.

FIG. 6 is a flowchart explaining the operation of the third embodiment of the refrigerator-freezer of the present invention.

FIG. 7 is a schematic configuration diagram showing a condenser circuit and related portions in which a refrigerant compressed by a compressor flows in an embodiment of a conventional refrigerator-freezer.

[Explanation of symbols]

 1 Outer Box 2 Compressor 8 Condensing Fan 10 Bottom Capacitor 11 Dew Prevention Capacitor 12 Detour Capacitor 13 Solenoid Valve 14 Temperature Sensor 15 Temperature Sensor 16 Temperature Sensor 17 Temperature Sensor 18 Temperature Sensor

Claims (3)

[Claims] 1. A condenser circuit for connecting a dew-prevention condenser in the middle of a heat-dissipating condenser in which a refrigerant compressed by a compressor flows and which is continuously piped around a front surface of an outer box of a refrigerating device which is openably and closably provided. An ambient temperature measuring device and an ambient humidity measuring device are provided in the outer box, and a bypass condenser for bypassing the dew condensation prevention condenser and a refrigerant flowing in the condenser circuit is provided, and an opening / closing mechanism for opening and closing the bypass condenser is provided. Provided with calculating means for calculating the dew-prevention temperature based on the measurement results of the ambient temperature measuring device and the ambient humidity measuring device, when the measured temperature of the ambient temperature measuring device is higher than the dew-prevention temperature, the opening and closing mechanism is closed, When the ambient temperature measuring device measures a temperature lower than the dew-prevention temperature, the refrigerating device with a refrigerating function is provided with detour control means for opening the opening / closing mechanism. Oite, frozen function with refrigerating apparatus characterized by the pipe on the side surface or rear surface of the outer box and the bypass capacitor. 2. The heat radiating capacitor comprises the dew condensation preventing capacitor, the bypass capacitor, and a bottom capacitor having a heat exchange fin for promoting heat dissipation of the refrigerant by blowing air from a condensing fan. The refrigerating apparatus with a refrigerating function according to claim 1, wherein the bottom condenser is provided integrally with the bottom condenser. 3. The refrigerating machine with a refrigerating function according to claim 2, further comprising a control unit for increasing the rotation speed of the condensing fan when the flow of the refrigerant is switched to the bypass condenser side by the opening / closing mechanism. apparatus.