JP2002139260A - Velocity regulator of blower for condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the velocity regulator of a blower for condenser which can perform the operation control of a compressor stably even at start of a refrigerating machine in a cold district in winter. SOLUTION: The velocity regulator 18 of the blower 11 for a condenser constitutes a refrigerating cycle, with the compressor 1, a condenser 3, a pressure reducing device (expansion valve) 7, and an evaporator 8 connected circularly in order. This regulator is provided with a condenser temperature sensor 14 which detects the temperature of the condenser 3. This is provided with a controller 16 which controls the operation of the blower 11 for a condenser with a specified standard pattern, and an outside air temperature 17 which detects the temperature of outside air. The controller 16 starts the blower 11 for a condenser with a pattern to accelerate the temperature rise of the condenser 3 more than the standard pattern, at a specified low outside air temperature, based on the output of the outside air temperature sensor 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a compressor, a condenser,
The present invention relates to a speed adjusting device of a blower for a condenser for performing air cooling of a condenser constituting a refrigeration cycle by sequentially connecting a pressure reducing device and an evaporator in a ring shape.

[0002]

2. Description of the Related Art Conventionally, a condenser constituting a refrigeration cycle of a refrigerator can adjust the rotation speed of a blower for the condenser provided in the condenser so that the refrigerant can be optimally condensed according to the condensation pressure and the outside air temperature. It is configured as follows. FIG. 4 shows the relationship among the rotation speed, condensation pressure and condensation temperature of this condenser blower.
Is shown in In the figure, the vertical axis indicates the rotation speed of the condenser blower, and the horizontal axis indicates the condensation pressure of the condenser. The rotation speed of the blower for the condenser is shown at a low speed (0 rpm) at the lower end of the vertical axis and at a high speed (1000 rpm) at the upper end, and the condensing pressure of the condenser is high (2.30 MPa) at the left end of the horizontal axis and at the right end. It is shown at a low pressure (0.60 MPa). The condensing temperature is high (about +5) when the condensing pressure is high (2.30 MPa).
8.5 ° C.) and low temperature (about +10.0
° C).

The operation of the blower for the condenser is performed in a high mode M1,
There are three modes, a medium mode M2 and a low mode M3, and the number of revolutions of the blower for the condenser changes depending on each mode M1, M2, M3. In the high mode M1, the condensing pressure and the condensing temperature are high (condensing pressure is about 0.92 MPa, condensing temperature is about +24
C), the rotation of the condenser blower starts to rotate and the rotation speed is increased as the condensing pressure and the condensing temperature increase. In the middle mode M2, in a state where the condensing pressure and the condensing temperature are lower than the high mode M1 (condensing pressure is about 0.63 MPa and the condensing temperature is about + 12 ° C.), the blower for the condenser starts rotating, and the condensing pressure and the condensing temperature rise. Rotation control of a pattern in which the number of rotations is increased as the rotation proceeds.

In the low mode M3, when the condensing pressure and the condensing temperature are further lower than those in the medium mode M2 (condensing pressure is about 0.77 MPa and condensing temperature is about + 17 ° C.), the blower for the condenser starts rotating, and the condensing pressure is reduced. Then, rotation control is performed in a pattern in which the number of rotations increases as the condensation temperature increases. Each of the modes M1, M2, and M3 is set by the equipment supplier when the refrigerator is installed, when the refrigerant is excessively condensed in a cold region or when the fan speed is reduced and the noise is reduced, the condensing capacity is reduced. In the mode M1, when the condensing pressure is to be kept low, the COP (coefficient of performance) is to be improved, and energy saving operation is desired, a mode suitable for the situation is set, such as the low mode M3 for increasing the condensing capacity.

[0005]

When the refrigerator is installed in a cold region where the outside air temperature is particularly low, the temperature of the condenser (condensation temperature) is difficult to rise because the outside air is low, and the compressor is started. At times, the pressures on the high pressure side and the low pressure side decrease, and it becomes difficult for the low pressure pressure to increase during operation. Also, when the pressures on the high pressure side and the low pressure side decrease, the condensing pressure of the condenser does not increase when starting the compressor, and the pressure on the evaporation side remains low. Failure to return the cooling chamber inside (short cycle operation)
was there. Therefore, a pressure switch for detecting the condensing pressure is provided, and when the compressor is started, control is performed to stop the blower for the condenser to an arbitrary pressure and increase the condensing pressure (FIG. 4). However, this method has a problem in that the rotation speed of the blower for the condenser during operation is greatly different from the number of revolutions at the time of stoppage, so that the condensing pressure becomes unstable and the evaporating pressure becomes unstable. For this reason, there is also a problem that a cooling failure occurs in winter when the outside air temperature is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and is intended for a condenser capable of stably controlling the operation of a compressor even when the refrigerator is started in a cold region in winter. An object of the present invention is to provide a speed adjusting device for a blower.

[0007]

According to a first aspect of the present invention, there is provided a speed adjusting device for a blower for a condenser, wherein a compressor, a condenser, a decompression device, and an evaporator are sequentially connected in a ring to form a refrigeration cycle. A condenser blower for air-cooling the condenser, wherein the condenser temperature sensor detects the temperature of the condenser, based on the output of the condenser temperature sensor,
A control device for controlling the operation of the condenser blower in a predetermined standard pattern, and an outside air temperature sensor for detecting an outside air temperature, wherein the control device is configured to output a predetermined low outside air temperature based on an output of the outside air temperature sensor. Occasionally, the blower for the condenser is started in a pattern that promotes a rise in the temperature of the condenser rather than a standard pattern.

According to a second aspect of the present invention, there is provided a speed adjusting device for a blower for a condenser, wherein a compressor, a condenser, a decompression device, and an evaporator are sequentially connected in a ring to constitute a refrigeration cycle.
A condenser blower for air-cooling the condenser, comprising a condenser temperature sensor for detecting the temperature of the condenser,
A control device that controls the operation of the condenser blower based on the output of the condenser temperature sensor, and an outside air temperature sensor that detects the outside air temperature are provided.The control device performs a predetermined operation based on the output of the outside air temperature sensor. At a low outside temperature, the condenser blower is started with a delay until the temperature of the condenser becomes higher than usual.

According to the first aspect of the present invention, the operation of the condenser blower is controlled in a predetermined standard pattern based on the output of the condenser temperature sensor and the output of the condenser temperature sensor. A control device, and an outside air temperature sensor for detecting an outside air temperature.The control device, based on the output of the outside air temperature sensor, at a predetermined low outside air temperature, prompts a rise in the condenser temperature more than a standard pattern. For example, the controller according to claim 2, based on the output of the outside air temperature sensor, at a predetermined low outside air temperature, causes the temperature of the condenser to be higher than normal. Since the condenser blower is started with a delay until it becomes, for example, even when the outside air temperature is low in a cold region in winter, for example, after the start of the refrigerator constituting the refrigeration cycle, Temperature of condenser is placed to stop the condenser blower until a higher value than usual, it is possible to rotate the condenser blower at low speed therefrom. Thereby, the rotation speed of the operation from the stop of the condenser blower can be gradually increased, so that the condensation pressure and the evaporation pressure can be extremely stabilized. Therefore, it is possible to prevent the inconvenience of poor cooling in winter when the outside air temperature is low.

[0010]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of a refrigerator to which a speed adjusting device 18 of a blower 11 for a condenser according to the present invention is applied.
FIG. 3 is a diagram showing the relationship between the condensing pressure and the condensing temperature of the speed adjusting device 18 of the present invention and the number of revolutions of the condenser blower 11, and FIG. Is shown.

In FIG. 1, a rotary compressor,
A pipe 4 constituting a condenser 3 is connected to a pipe 2 on a discharge side of a compressor 1 composed of a scroll compressor or the like, and an outlet side of the condenser 3 is connected via a pipe 6 to an expansion valve 7 as a pressure reducing device. Have been. The expansion valve 7 is connected to an evaporator 8, and the outlet side of the evaporator 8 is connected to the compressor 1 to form an annular refrigeration cycle.

The condenser 3 includes a heat exchanger 9 in which the pipe 4 is inserted through a plurality of heat exchange fins and a blower 11 for the condenser.
The condenser blower 11 includes a motor 12 and a propeller fan 13. Then, the evaporator 8 is installed indoors, and the compressor 1 and the condenser 3 are installed outdoors. A condenser temperature sensor 14 is attached to the pipe 4 of the heat exchanger 9 of the condenser 3,
The condenser temperature sensor 14 is connected to the control device 16 of the condenser blower 11.

The controller 16 is further connected to an outdoor temperature sensor 17 for detecting an outdoor temperature at which the condenser 3 is installed, that is, an outside air temperature. The controller 16, the condenser temperature sensor 14, and the outside air temperature sensor The speed adjustment device 18 of the condenser blower 11 is constituted by 17. Also,
A pressure switch 10 for rotating the condenser blower 11 at full speed is connected to the outlet pipe 6 of the condenser 3, and this pressure switch 10 is also connected to the control device 16.

When the compressor 1 is started, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows through the pipe 2 into the heat exchanger 9 of the condenser 3. Outside air is passed through the heat exchanger 9 from the condenser blower 11 as described later.
The refrigerant flowing into the heat exchanger 9 is air-cooled and condensed and liquefied.
The refrigerant flowing out of the condenser 3 reaches the expansion valve 7 via the pipe 6,
Then, after the pressure is reduced, it flows into the evaporator 8 and evaporates there. The interior of the refrigerator is cooled by the heat absorbing action at this time. Then, the refrigerant flowing out of the evaporator 8 is sucked into the compressor 1.
A low-pressure switch (not shown) is provided on the suction side (low-pressure side) of the compressor 1 to detect the upper and lower limits of the set pressure (low-pressure side) and start / stop the compressor 1.

FIG. 2 shows the operation control of the condenser blower 11 by the speed adjusting device 18. The operation of the condenser blower 11 is the same as the conventional high mode M1 and medium mode M
2. Based on the three modes of the low mode M3 and the output of the outside air temperature sensor 17, the temperature of the condenser 3 becomes higher than usual at a predetermined low outside air temperature (for example, in winter when the outside air temperature is low). And a cold district mode M4 of a cold district characteristic curve for starting the condenser blower 11 with a delay of up to
dotted line). In the cold district mode M4, the condensing pressure is about 1.21.
The rotation of the condenser blower 11 is started in a state where the condensing temperature is about + 33 ° C. and the rotation speed is increased as the condensing pressure and the condensing temperature are increased.

That is, the controller 16 controls the outside air temperature sensor 17
At the time of a predetermined low outside temperature based on the output of the condenser 3 is higher than the standard pattern (the pattern in which the condenser blower 11 is operated in the high mode M1, the middle mode M2, and the low mode M3).
The condenser blower 11 is started in a pattern that promotes the temperature rise. Specifically, when the outside air temperature is, for example, equal to or lower than + 3 ° C., the operation is started in the cold district mode M4. The cold region mode M
The characteristic of No. 4 is such that the condensing pressure is about 1.21 MPa and the condensing temperature is about + 33 ° C., so that the rotation of the condenser blower 11 is started, thereby promoting the temperature rise of the condenser 3. . When the outside air temperature at the time of starting exceeds + 3 ° C., the rotation of the condenser blower 11 is controlled in a normal mode (high mode M1, middle mode M2, low mode M3).

Next, referring to the flowchart of FIG. 3, the control device 16 of the speed adjusting device 18 controls the blower 11 for the condenser.
Will be described. Compressor 1 in step S1
Starts and the process proceeds to step S2. In step S2, the control device 16 inputs the outside air temperature AT based on the output signal of the outside air temperature sensor 17, and determines whether or not the outside air temperature AT is equal to or lower than + 3 ° C.

The control device 16 determines that the outside air temperature AT is +
If the temperature is not equal to or lower than 3 ° C., the process proceeds to step S3 to operate the condenser blower 11 in the normal mode (the standard pattern of the high mode M1, the middle mode M2, and the low mode M3).
That is, if the outside air temperature AT is not equal to or lower than + 3 ° C., the controller 16 sets the temperature (condensation temperature) of the heat exchanger 9 of the condenser 3 input from the condenser temperature sensor 14 to the high mode M in this case.
In the case of 1, the condenser blower 11 starts rotating with the condensing pressure being about 0.92 MPa and the condensing temperature being about + 24 ° C., and condensing in a pattern of increasing the number of revolutions as the condensing pressure and the condensing temperature rise. The rotation of the dexterous blower 11 is controlled.

When the temperature of the heat exchanger 9 of the condenser 3 input from the condenser temperature sensor 14 is in the range of the middle mode M2, the controller 16 sets the condensation pressure and the condensation temperature lower than those of the high mode M1. When the pressure is about 0.63 MPa and the condensing temperature is about + 12 ° C., the condenser blower 11 starts to rotate, and the rotation of the condenser blower 11 in a pattern of increasing the number of revolutions as the condensing pressure and the condensing temperature rises. Perform control.

When the temperature of the heat exchanger 9 of the condenser 3 input from the condenser temperature sensor 14 is in the low mode M3, the control device 16 further reduces the condensing pressure and the condensing temperature in the middle mode M2. The condenser blower 11 starts to rotate from the state where the condensing pressure is about 0.77 MPa and the condensing temperature is about + 17 ° C., and the number of rotations increases as the condensing pressure and the condensing temperature rise. Perform rotation control. Then, the blower 11 for the condenser is operated in the normal mode control, and the process proceeds to step S4, and when the operation of the compressor 1 is stopped, the process returns to step S1 and is repeated.

In step S2, the control device 16 proceeds to step S5 if the outside air temperature AT inputted based on the output signal of the outside air temperature sensor 17 is equal to or lower than + 3 ° C., and starts the condenser blower 11 in the cold district mode M4 ( The condenser blower 11 is started in a pattern that promotes a rise in the temperature of the condenser 3 as compared with the standard pattern. Specifically, the control device 16
When the outside air temperature AT is equal to or lower than + 3 ° C., the operation start (rotation) of the condenser blower 11 is delayed until the condensing pressure rises to about 1.2 MPa and the condensing temperature rises to about + 33 ° C.

When the condensing pressure rises to about 1.2 MPa and the condensing temperature rises to about + 33 ° C., the control device 16 starts the operation (rotation) of the motor 12 of the condenser blower 11 at a low speed, and the condensing pressure and the condensing pressure rise. As the temperature rises, the number of revolutions is increased. Thereby, the outside air temperature AT is increased by +3.
The condensing pressure in the condenser 3 is controlled to an appropriate value by adjusting the air cooling capacity of the condenser 3 at a temperature of not more than ° C. Next, when the operation proceeds to step S4 and the operation of the compressor 1 is stopped, the operation returns to step S1 and this operation is repeated.

As described above, based on the output of the outside air temperature sensor 17, at a predetermined low outside air temperature, the control device 16 controls the blower 1 for the condenser 1 until the temperature of the condenser 3 becomes higher than usual.
Since the rotation of the compressor 1 is started after the start of the compressor 1 is delayed, it is possible to prevent the compressor 1 from being repeatedly operated and stopped even when the outside temperature is low in a cold region in winter. It becomes possible. As a result, it is possible to prevent inconvenience that cooling failure occurs in winter when the outside air temperature AT is low.

The speed adjusting device 1 of the blower 11 for the condenser
Although 8 is used in the refrigerant circuit of the refrigerator, the invention is not limited to this, and the speed adjusting device 18 of the condenser blower 11 may be used in a refrigerated freezer, a cooled freezer, or the like.

[0025]

As described above in detail, according to the present invention, a condenser temperature sensor for detecting the temperature of the condenser and a blower for the condenser in a predetermined standard pattern based on the output of the condenser temperature sensor are provided. A control device for controlling operation and an outside air temperature sensor for detecting an outside air temperature are provided.The control device is based on an output of the outside air temperature sensor and at a predetermined low outside air temperature,
Since the blower for the condenser is started in a pattern that promotes the temperature rise of the condenser than the standard pattern,
For example, based on the output of the outside air temperature sensor, the control device delays the condenser temperature to a higher value than usual and starts the condenser blower at a predetermined low outside air temperature based on the output of the outside air temperature sensor. Therefore, for example, even when the outside air temperature is low in a cold region in winter, etc., after the start of the refrigerator constituting the refrigeration cycle, the blower for the condenser is stopped until the temperature of the condenser becomes higher than usual. From which the blower for the condenser can be rotated at low speed. Thereby, the rotation speed of the operation from the stop of the condenser blower can be gradually increased, so that the condensation pressure and the evaporation pressure can be extremely stabilized. Therefore, it is possible to prevent the inconvenience of poor cooling in winter when the outside air temperature is low.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigerator to which a speed adjusting device for a blower for a condenser according to the present invention is applied.

FIG. 2 is a diagram showing the relationship between the condensing pressure and the condensing temperature of the speed adjusting device of the present invention and the number of revolutions of the blower for the condenser.

FIG. 3 is a flowchart of a program of a control device constituting the speed adjusting device of the present invention.

FIG. 4 is a diagram showing the relationship between the condensing pressure and the condensing temperature of the conventional speed adjusting device and the rotation speed of the blower for the condenser.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 3 Condenser 7 Expansion valve 8 Evaporator 11 Condenser blower 12 Motor 14 Condenser temperature sensor 16 Control device 17 Outside air temperature sensor 18 Speed control device M1 High mode M2 Medium mode M3 Low mode M4 Cold district mode

Claims (2)

[Claims] 1. A refrigeration cycle comprising a compressor, a condenser, a decompression device, and an evaporator sequentially connected in a ring, and a condenser blower for air-cooling the condenser. A condenser temperature sensor that detects the temperature of the condenser, based on the output of the condenser temperature sensor, a control device that controls the operation of the condenser blower in a predetermined standard pattern,
An outside air temperature sensor for detecting an outside air temperature, wherein the control device is configured to output the outside air temperature sensor based on an output of the outside air temperature sensor.
A speed adjusting device for a blower for a condenser, wherein the blower for the condenser is started in a pattern that promotes a rise in the temperature of the condenser more than the standard pattern at a predetermined low outside temperature. 2. A compressor comprising: a compressor, a condenser, a decompression device, and an evaporator, which are sequentially connected in a ring to form a refrigeration cycle, and further comprising a condenser blower for air-cooling the condenser. A condenser temperature sensor that detects the temperature of the condenser, a control device that controls the operation of the condenser blower based on the output of the condenser temperature sensor, and an outside air temperature sensor that detects the outside air temperature. Based on the output of the outside air temperature sensor,
A speed adjusting device for a condenser blower, wherein at a predetermined low outside temperature, the condenser blower is started with a delay until the temperature of the condenser becomes higher than usual.