JP3100490B2 - Annual cooling control device for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annual cooling control device for an air conditioner.

[0002]

2. Description of the Related Art FIG.
Since the rotation of the outdoor unit fan motor is intermittently operated ON / OFF by the high pressure of the refrigeration cycle as shown in (1), the pipe temperatures PA, PB, PC and PD are uniquely determined.
In the high pressure range, the ON time T1 of the operation of the outdoor unit fan motor is 0, and the operation time of the outdoor unit fan motor is 0.
By uniquely determining the FF time T2, the fluctuation range of the high pressure is narrowed, and the fluctuation range of the blowout temperature is narrowed.

[0003]

In such conventional control, as shown in FIG. 11, when the outdoor air temperature is equal to or lower than t _A , the outdoor fan motor is turned off by the high pressure PB as the high pressure decreases. Since the outdoor unit fan motor is OFF, the high pressure increases and becomes the high pressure PC. And the outdoor unit fan motor is turned on / off by the high pressure PC
Intermittent operation. At this time, since the outdoor air temperature is low and the ability to radiate heat from the outdoor is large, the high pressure gradually decreases to the high pressure PB. This operation is repeated.

When the outdoor air temperature is between t _{A and} t _B , the outdoor unit fan motor performs an ON / OFF intermittent operation. When the outdoor air temperature is equal to or higher than t _B , the outdoor unit fan motor is turned on at the high pressure PD when the high pressure increases. Then, since the outdoor unit fan motor is ON, the high pressure drops and becomes the high pressure PA. Then, the outdoor unit fan motor performs the ON / OFF / OFF intermittent operation by the high pressure PA. At this time, since the outdoor air temperature is high and the ability to radiate heat from the outdoor unit is small, the high pressure gradually increases and the high pressure PD
Becomes This operation is repeated.

[0005] Therefore, the outdoor load changes, and the refrigeration cycle becomes unstable, and the indoor blow-out temperature fluctuates and the comfort is impaired. That is, in the conventional control, the high-pressure pressure can be relatively stabilized in the ON / OFF intermittent operation region of the outdoor fan motor. As a result, there is no change in the indoor-side blowout temperature, and the comfort can be maintained to some extent. However, in other regions, it is impossible to stabilize the high-pressure pressure, and the fluctuation range of the indoor-side blow-out temperature becomes large, so that the user has to feel uncomfortable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an annual cooling control device for an air conditioner which can reduce the fluctuation range of the outlet temperature on the indoor side and can significantly improve comfort.

[0007]

According to a first aspect of the present invention, there is provided an annual cooling control apparatus for an air conditioner, comprising: a heat exchanger for causing an outdoor unit to radiate heat during a cooling operation; a fan for promoting the heat exchanger;
In a variable capacity air conditioner equipped with a fan motor for driving the same, a high-pressure pressure detecting means for detecting a high-pressure side pressure of a refrigeration cycle, a high-pressure pressure storing means having a set high-pressure without a differential, and Comparing means for comparing the detected pressure value of the pressure detecting means with the set high-pressure pressure value of the high-pressure pressure storing means; and operating the outdoor unit fan motor for a predetermined time of 0 N based on the comparison result of the comparing means.
Alternatively, an outdoor fan motor rotation speed varying means for turning off for a predetermined time is provided.

[0008]

According to the construction of the first aspect, as shown in FIG. 1, the outdoor load is detected by the high pressure detection means 1 by the high pressure, and the detected high pressure and the differential set in the high pressure storage means 2 are set. Is compared with the set high pressure which does not have the high pressure, and when the high pressure is low, the outdoor fan motor rotation speed variable means 4
Is turned off for a certain period of time. When the high pressure is high, the outdoor fan motor 5 is turned on for a certain time. The fan motor is turned on or off for a certain period of time, and the detection, comparison, and output to the fan motor of high pressure are repeated. By shortening the cycle, the outdoor fan performs random intermittent operation to reduce the outdoor load. Can respond to fluctuations in detail. Also, when the outdoor fan motor is in the ON range to the OFF range,
Since there is no pressure difference when shifting from the F region to the ON region, that is, a so-called set high pressure having no differential, there is no operation that crosses both regions as in the related art. That is, the fluctuation range of the high pressure on the outdoor side is eliminated irrespective of the outside air temperature. As a result, the refrigerating cycle is stabilized and the temperature on the indoor side is not changed, and the comfort is remarkably improved.

According to the second aspect of the present invention, in addition to the first aspect, the outside air temperature is detected by the outside air temperature detecting means 6 and the detected outside air temperature and the set value set in the outside air temperature storage means 7 are set. Is compared with the comparison means 8 to control the outdoor fan motor rotation speed variable means 4 to change the operation time and the stop time of the outdoor fan motor according to the outdoor air temperature, thereby further eliminating the fluctuation range of the high pressure. As a result, the refrigerating cycle is stabilized, and the temperature of the indoor-side blow-out temperature does not change, and the comfort is remarkably improved.

According to the third aspect of the present invention, by changing the set high pressure of the high pressure storage means of the first aspect according to the outdoor temperature at the output of the comparing means, the fluctuation range of the high pressure is eliminated. As a result, the refrigeration cycle is stabilized, and there is no change in the indoor-side blow-out temperature according to the outdoor-side load, and the comfort is further remarkably improved.

According to the configuration of claim 4, the output of the comparing means 8 controls the outdoor fan motor rotation speed variable means 4 to change the rotation speed of the outdoor air fan motor 5 in accordance with the outdoor air temperature. The fluctuation range of the pressure is eliminated, and as a result, the refrigeration cycle is stabilized, and the temperature of the indoor-side blowout temperature is not changed.

According to the fifth aspect of the present invention, the compressor frequency varying means 9 is controlled by the output of the comparing means 8 to regulate the operating frequency of the compressor 10 according to the outdoor temperature, thereby eliminating the fluctuation range of the high pressure. As a result, the refrigerating cycle is stabilized, and there is no change in the indoor-side blowing temperature, so that the comfort is remarkably improved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 2, 3 and 4 show a first embodiment. Reference numeral 11 denotes a high-pressure side pressure sensor as the high-pressure pressure detecting means 1. The resistance value changes in accordance with a pressure change on the high-pressure side of the refrigeration cycle, and is output as a divided voltage with the resistance 12. Reference numeral 13 denotes a microcomputer constituting the high-pressure pressure storage means 2 and the comparison means 3, which compares the high-pressure pressure Pa input from the high-pressure side pressure sensor 11 with a preset high-pressure pressure Pb.
The output data to the outdoor fan motor rotation speed variable means 4 is determined according to the magnitude of the above, and the rotation speed of the outdoor fan motor 5 is controlled.

More specifically, as shown in FIG. 4, when “Pa> Pb” between the high pressure Pa detected by the high pressure sensor 11 and the set high pressure Pb, the outdoor fan motor 5 is set to a counter n = n. OFF during When “Pa <Pb”, the outdoor fan motor 5 is set to the counter n = n. ON during By repeating these operations, it is possible to respond finely to fluctuations in the outdoor load.In other words, the fluctuation range of the high-pressure is eliminated, and as a result, the refrigeration cycle is stabilized, and there is no change in the indoor outlet temperature. improves.

In the first embodiment, the microcomputer 2 is operated based on the detected value from the high-pressure side pressure sensor 11. However, as indicated by a broken line in FIG. The function is improved by adding the outside air temperature thermistor 14 as 6 and changing the specific operation of the microcomputer 2 from the first embodiment as follows.

In the second embodiment, the microcomputer 2 compares the high pressure Pa with a predetermined high pressure Pb, and determines the output data to the outdoor fan motor rotation speed varying means 4 based on the magnitude of the high pressure Pb. The outside air temperature t input to the microcomputer 2 as a divided voltage between the outside air temperature thermistor 14 and the resistor 15 is the outside air temperature t and the outdoor fan motor operation time n shown in FIG. , Outdoor fan motor stop time n. 'And determine them from the relationship.

The flowchart of the second embodiment shows the outdoor fan motor operating time n in the first embodiment. And stop time n. ′ Is completely the same except that it is determined by the outside air temperature in FIG.

By adopting the structure as in the second embodiment, it is possible to respond more finely to fluctuations in the outdoor load. That is, the fluctuation range of the high pressure is eliminated, and as a result, the refrigeration cycle is stabilized and the change in the indoor air temperature is reduced. Gone
Comfort is significantly improved.

In the second embodiment, the operation time and the stop time are changed in accordance with the outdoor temperature. However, the second embodiment is configured as in the following third, fourth and fifth embodiments. Even the comfort is significantly improved.

The third embodiment is configured as follows.
Based on the outside air temperature t input from the outside air temperature thermistor 14, the microcomputer 2 calculates the outside air temperature t shown in FIG.
The set high pressure Pb is determined from the relationship between the pressure and the set high pressure Pb. High pressure P input from the high pressure sensor 11
The value a is compared with the preset high pressure Pb in the microcomputer 2, and the output data to the outdoor fan motor rotation speed variable circuit 3 is determined based on the magnitude of the high pressure Pb in FIG. Set high pressure P in the first embodiment
The flowchart is omitted because b is completely determined by the outside air temperature t in FIG. 6, but the above operation is repeated, so that the fluctuation of the outdoor load can be more finely dealt with. The fluctuation range of the pressure is eliminated, and as a result, the refrigeration cycle is stabilized, and the temperature of the indoor-side blowout temperature is not changed.

The fourth embodiment is configured as follows.
Based on the outside air temperature t input from the outside air temperature thermistor 14, the microcomputer 2 calculates the outside air temperature t shown in FIG.
The outdoor fan motor rotation speed N is determined from the relationship between the outdoor fan motor rotation speed N and the outdoor fan motor rotation speed N. The high-pressure pressure Pa input from the high-pressure side pressure sensor 11 is calculated by the microcomputer 2
The output data to the outdoor fan motor rotation speed variable circuit 3 is determined by comparison with a preset high pressure Pb.
The flowchart is omitted because the procedure is exactly the same as in the first embodiment except that the outdoor fan motor rotation speed N when the output to the outdoor fan motor is ON is determined by the outside air temperature t in FIG. By repeating the operation, it is possible to respond more finely to fluctuations in the outdoor load.In other words, the fluctuation range of the high pressure is eliminated, and as a result, the refrigeration cycle is stabilized and there is no change in the indoor outlet temperature, and comfort is significantly improved. I do.

The fifth embodiment is configured as follows.
FIG. 8 shows this embodiment. The microcomputer 2 is based on the outside air temperature t inputted from the outside air temperature thermistor 14.
Determines the compressor operating frequency f from the relationship between the outside air temperature t and the compressor operating frequency f shown in FIG. 9 and outputs data to the compressor operating frequency varying means 9. The high-pressure pressure Pa input from the high-pressure side pressure sensor 11 is compared by the microcomputer 2 with a predetermined high-pressure pressure Pb to determine output data to the outdoor fan motor rotation speed variable means 4. The flowchart is omitted because the operation is completely the same except that the compressor operating frequency in the first embodiment is defined by the outside air temperature in FIG. 9, but the above operation is repeated to further prevent the fluctuation of the outdoor load. It can respond finely, that is, eliminates the fluctuation range of the high pressure, and consequently stabilizes the refrigeration cycle and does not change the indoor-side blow-out temperature, thereby significantly improving comfort.

[0023]

As described above, according to the annual cooling control apparatus for the air conditioner of the present invention, it is possible to prevent the freezing of the indoor heat exchanger by eliminating the change in the high pressure caused by the change in the outdoor temperature. Further, the variation width of the indoor-side blowout temperature can be reduced irrespective of the outdoor temperature, and the comfort can be remarkably improved.

Further, by changing the outdoor fan motor operation time and the stop time at the outdoor temperature, it is possible to stabilize the refrigeration cycle even when the outdoor temperature and the indoor temperature change, and to stabilize the indoor blowout temperature regardless of the temperature change. it can.

Further, by changing the set high pressure at the outdoor air temperature, the refrigerating cycle can be stabilized even at the changes of the outdoor air temperature and the indoor air temperature, and the indoor blowout temperature can be stabilized irrespective of the change of the air temperature.

In addition, the reliability of the outdoor fan motor can be improved by changing the rotation speed of the outdoor fan motor in accordance with the outdoor air temperature and controlling the minimum rotation speed required to eliminate the variation range of the high pressure. Can be.

Also, by regulating the compressor operating frequency based on the outdoor air temperature, the refrigerating cycle is stabilized, the change in the indoor blowout temperature is eliminated, and the lower limit of the compressor operating frequency is controlled when the outdoor air temperature is low, so that the refrigerant compression is suppressed. The reliability of the compressor can be improved by preventing the liquid sealing phenomenon and ensuring the oil level of the compressor.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims of the present invention.

FIG. 2 is a block diagram of the present invention.

FIG. 3 is a characteristic diagram of the ON / OFF state of the outdoor fan and the high pressure according to the present invention.

FIG. 4 is a flowchart of the present invention.

FIG. 5 is a diagram showing the relationship between the outside air temperature, the outdoor fan motor operation time, and the stop time according to the present invention.

FIG. 6 is a diagram showing the relationship between the outside air temperature and the set high pressure according to the present invention.

FIG. 7 is a diagram showing the relationship between the outside air temperature and the number of revolutions of an outdoor fan motor according to the present invention.

FIG. 8 is a block diagram of the present invention.

FIG. 9 is a diagram showing the relationship between the outdoor air temperature and the compressor operating frequency according to the present invention.

FIG. 10 is a characteristic diagram of the ON / OFF state and the high pressure of the outdoor fan of the conventional example.

FIG. 11 is a graph showing a relationship between a high pressure and an outside air temperature according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-pressure pressure detection means 2 High-pressure pressure storage means 3 Comparison means 4 Outdoor fan motor rotation speed variable means 5 Outdoor fan motor 6 Outside air temperature detection means 7 Outside air temperature storage means 8 Comparison means 9 Compressor frequency variable means 10 Compressor

────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Yasuhiro Nakamura 1006 Kazuma Kadoma, Kadoma City, Osaka Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-4-268155 (JP, A) 100853 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 11/02 102 F25B 1/00 381

Claims (5)

(57) [Claims] 1. A refrigeration cycle in a variable-capacity air conditioner equipped with a heat exchanger that causes an outdoor unit to radiate heat during cooling operation, a fan for promoting the heat exchanger, and a fan motor for driving the heat exchanger. High-pressure pressure detecting means for detecting the high-pressure side pressure, high-pressure pressure storing means of a set high-pressure pressure having no differential, and comparing the detected pressure value of the high-pressure pressure detecting means with the set high-pressure pressure value of the high-pressure pressure storing means. An air conditioner annual cooling control device comprising: a comparison unit that performs the operation and an outdoor fan motor rotation speed variable unit that turns off the operation of the outdoor unit fan motor for a predetermined time period of 0N or a predetermined time period based on the comparison result of the comparison unit. 2. The annual cooling control device for an air conditioner according to claim 1, wherein the outdoor fan motor rotation speed varying means changes the operation time and the stop time according to the outdoor temperature. 3. The annual cooling of an air conditioner according to claim 1, wherein the set high pressure value, which is compared with the detected pressure value of the pressure detecting means by the comparing means, is changed according to the outdoor temperature. Control device. 4. The annual cooling control device for an air conditioner according to claim 1, wherein the outdoor air fan motor speed is changed according to the outdoor temperature. 5. An outdoor air temperature detecting means for detecting an outdoor air temperature, an outdoor air temperature storing means, a comparing means for comparing them, and a compressor operating frequency variable based on a comparison result of the comparing means. Annual air conditioner control unit for air conditioners.