JPH102625A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent operational instability in case of stopping a refrigerator for a long time at the time of low atmospheric temperature by deciding number of operating fans for a condenser in response to a detected temperature of an atmospheric temperature sensor. SOLUTION: An atmospheric temperature sensor 12 for detecting a temperature of the atmosphere sucked to a condenser 2 is provided. The detected temperature is input to a number-of-operating fans deciding means 21 mounted at a fan controller 20. The number of operating fans is decided in response to the atmospheric temperature based on a control rule stored in a control rule memory means 24, and output to respective fan motors 9A, 9B, 9C. The number of the operating fans is reduced in response to the detected temperature of the sensor at the time of restarting after the atmospheric temperature is low and they are stopped for a long time, and numbers of revolutions of the operated fans are reduced. Accordingly, since high pressure can be raised and hence a high and low pressure difference of a predetermined value or more can be maintained, a refrigerator can be stably operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner,
The present invention relates to a refrigerator such as a refrigerator and a refrigerated showcase.

[0002]

2. Description of the Related Art A system diagram of a conventional refrigeration system of this kind is shown in FIG. When the refrigerating apparatus is operated, the gas refrigerant discharged from the compressor 1 enters the condenser 2, where it radiates heat to the outside air blown by a plurality (three in the figure) of condenser fans 3A, 3B, 3C. It condenses and liquefies.

The refrigerant is adiabatically expanded by being throttled by the throttle mechanism 4 to be in a gas-liquid two-phase state and enters the evaporator 5.
Here, the inside air blown by the evaporator fan 6 is cooled and evaporated and vaporized, so that it becomes a gas refrigerant and is sucked into the compressor 1.

When the refrigerant condensing temperature detected by the condensing temperature sensor 7 is input to the fan controller 8, the fan controller 8 outputs the refrigerant condensing temperature to the drive motors 9A, 9B, 9C of the condenser fans 3A, 3B, 3C. depending tap the condensation temperature sequentially and gradually switched from H ₁ as shown in FIG. 6 to L _02. And multiple fans 3A, 3B, 3C for condenser
Are started at the same time and stopped at the same time.

[0005]

In the above-mentioned conventional refrigeration system, when the refrigeration system is stopped for a long time (for example, 20 minutes) due to a thermo-off or the like at a low outside temperature (for example, -15 ° C.), the refrigerant is stored in the condenser 2. Liquefies and accumulates. When this refrigeration apparatus is activated by the thermo-on or the like, operation of the compressor 1 is started, a plurality of condenser fan 3A, 3B, since the 3C starts to rotate at the lowest speed L ₀₂ simultaneously, high-pressure pressure rise Without
Since a pressure difference higher than a predetermined value cannot be obtained, the refrigerating apparatus may be abnormally stopped.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first aspect of the present invention is a compressor, a condenser, a throttle mechanism, an evaporator, and the like. Apparatus comprising: a refrigerant circuit comprising: a plurality of condenser fans for blowing outside air to the evaporator; and a fan controller for controlling the rotation speed of the plurality of condenser fans in accordance with the condensation temperature. In the above, the outside air temperature sensor for detecting the outside air temperature is provided, and the fan controller is provided with fan operation number determination means for determining the operation number of the plurality of condenser fans in accordance with the detection temperature of the outside temperature sensor. A refrigeration apparatus characterized in that:

The gist of the second invention is to provide a refrigerant circuit including a compressor, a condenser, a throttle mechanism, an evaporator, and the like.
Refrigeration equipment comprising a plurality of condenser fans for blowing outside air to the evaporator and a fan controller for controlling the number of rotations of the plurality of condenser fans in accordance with the condensation temperature. A refrigerating apparatus, further comprising a high-pressure sensor for performing the operation, and the fan controller further including a fan operation number determination unit for determining the operation number of the plurality of condenser fans in accordance with the detection pressure of the high-pressure sensor. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIG. As shown in FIG. 1, an outside air temperature sensor 12 for detecting the temperature of the outside air sucked into the condenser 2 is provided, and the detected temperature is inputted to a fan operation number determining means 21 provided to a fan controller 20. It has become.

During operation of the refrigeration system, the condensing temperature detected by the condensing temperature sensor 7 is input to the fan rotation speed determining means 22 and stored in the control rule storing means 23 in FIG.
The tap of each fan motor 9A, 9B, 9c is determined according to the condensation temperature based on the control rule shown in FIG.

This determination is output to the fan motors 9A, 9B and 9C through the fan operating number determination means 21. By switching these taps, each fan 3
A, 3B and 3C rotate at the rotation speed corresponding to the condensation temperature.

When the outside air temperature detected by the outside air temperature sensor 12 is input to the fan operation number determination means 21, the fan operation number determination means 21 is based on the control rule shown in FIG. To determine the number of fans operating according to the outside air temperature.
Output to B and 9C.

Thus, when the operation of the refrigeration system is restarted due to the thermo-on or the like at a low outside air temperature, the fan 3 for the condenser is restarted.
Since the number of operating units A, 3B and 3C decreases and the operating fan for the condenser also rotates at the minimum speed _L02 , the condenser 2
The amount of air flowing through the air decreases, and the condensation ability of the air decreases. As a result, the high pressure can be increased, and a high or low pressure difference of a predetermined value (eg, 5 kg / Cm ² ) or more can be maintained.
The refrigeration system can be operated stably.

A second embodiment of the present invention is shown in FIGS. In the second embodiment, a high pressure sensor 13 for detecting a high pressure is attached to a high pressure refrigerant pipe 14.

When the detected pressure of the high-pressure sensor 13 is input to the fan operation number determining means 25 attached to the fan controller 20, the fan operation number determining means 25 stores the detected value in the control rule storage means 26 according to the detected pressure. The operating number of the condenser fans 3A, 3B, 3C is determined based on the control rule shown in FIG. Other configurations are the same as those of the first embodiment shown in FIG. 1, and corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, at a low outside air temperature, when the operation is resumed after a long stop, the number of operating the condenser fans 3A, 3B, 3C is reduced, and the rotational speed of the operated condenser fan is also the lowest speed L _02. Therefore, the high-pressure pressure can be increased, and therefore, a high-low pressure difference equal to or more than a predetermined value can be maintained.

[0016]

According to the first aspect of the present invention,
At low outside air temperature, when the operation is restarted after a long stoppage, the number of condenser fans operating decreases and the number of rotations of the operated condenser fan decreases according to the temperature detected by the outside air temperature sensor. The refrigeration apparatus can be stably operated because the pressure difference can be maintained higher than the predetermined value.

According to the second aspect of the present invention, when the operation is restarted after a long stoppage at a low outside air temperature, the number of operating fans for the condenser is reduced according to the pressure detected by the high pressure sensor, and the fan is operated. Since the number of revolutions of the condenser fan also decreases, the high-pressure pressure can be increased, and the high-low pressure difference equal to or more than a predetermined value can be maintained, so that the refrigeration apparatus can be operated stably.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a control rule for the number of fans operating in the first embodiment.

FIG. 3 is a system diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a control rule for the number of fans operating according to a second embodiment.

FIG. 5 is a system diagram of a conventional refrigeration apparatus.

FIG. 6 is a diagram showing a control rule for a fan speed in a conventional refrigeration system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3A, 3B, 3C Fan for condenser 4 Throttle mechanism 5 Evaporator 7 Condensation temperature sensor 12 Outside temperature sensor 20 Fan controller

Claims (2)

[Claims] 1. A refrigerant circuit comprising a compressor, a condenser, a throttle mechanism, an evaporator and the like, a plurality of condenser fans for blowing outside air to the evaporator, and rotation of the plurality of condenser fans. A refrigerating apparatus including a fan controller that controls the number of the condensers according to the condensing temperature. A refrigeration apparatus further comprising fan operation number determination means for determining the number of dexterous fans operated. 2. A refrigerant circuit including a compressor, a condenser, a throttle mechanism, an evaporator, etc., a plurality of condenser fans for blowing outside air to the evaporator, and rotation of the plurality of condenser fans. A refrigerating apparatus including a fan controller for controlling the number of the condenser fans in accordance with the condensation temperature, wherein a high-pressure sensor for detecting a high-pressure pressure is provided, and the fan controller for the plurality of condensers is provided to the fan controller in accordance with the detection pressure of the high-pressure sensor. A refrigeration apparatus provided with fan operation number determination means for determining the number of operation units.