JP3097374B2 - 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 Conventionally, in annual cooling of an air conditioner, FIG.
As shown in FIG. 0, the rotation of the outdoor unit fan motor is turned ON / OFF intermittently according to the pipe temperature.
A, TB, TC, and TD are uniquely determined, and within the pipe temperature range, the ON time T1 for operating the outdoor unit fan motor and the OFF time T2 for stopping the outdoor unit fan motor.
Is uniquely determined, the fluctuation range of the outdoor pipe temperature is narrowed, and the fluctuation range of the blowout temperature is narrowed.

[0003]

However, in such conventional control, as shown in FIGS. 10 and 11, when the outdoor air temperature is equal to or lower than tA and the outdoor pipe temperature decreases, the outdoor temperature is reduced by the pipe temperature TB. Since the fan motor is turned off and the outdoor unit fan motor is turned off, the pipe temperature rises to reach the pipe temperature TC, and the outdoor unit fan motor is turned on and off intermittently from the pipe temperature TC. At this time, since the outdoor air temperature is low and the ability to radiate heat from the outdoor is large, the pipe temperature gradually decreases to the pipe temperature TB, and this operation is repeated. Also, if the outdoor temperature is tA or more and tB
In the following cases, the outdoor unit fan motor performs an ON / OFF intermittent operation. When the outdoor air temperature is equal to or higher than tB and the outdoor pipe temperature increases, the outdoor unit fan motor is turned on at the pipe temperature TD. Then, since the outdoor unit fan motor is ON, the pipe temperature decreases to reach the pipe temperature TA. And the outdoor unit fan motor is ON / OFF / O according to the pipe temperature TA.
The intermittent operation of the FF is performed. At this time, since the outdoor air temperature is high and the ability to radiate heat from the outdoor unit is small, the pipe temperature gradually rises to the pipe temperature TD. This operation is repeated.
As a result, the outdoor load changes, and the refrigeration cycle is not stabilized, and the indoor blow-out temperature fluctuates, impairing comfort. That is, in the conventional control, ON / OFF of the outdoor fan motor is performed.
In the intermittent operation area, the outdoor pipe temperature can be relatively stabilized, and as a result, the indoor-side blowout temperature does not change and comfort can be maintained to some extent, but in other areas, the outdoor pipe temperature is stabilized. Is impossible,
The fluctuation range of the indoor-side blowout temperature becomes large, and the user is forced to feel uncomfortable.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heat exchanger for causing an outdoor unit to radiate heat during a cooling operation, a fan for promoting the heat exchanger, and a fan for driving the same. A variable capacity air conditioner equipped with a motor detects the outdoor piping temperature and compares it with a preset set value that does not have a differential.
When the outdoor piping temperature is low, the fan motor is turned off for a certain period of time.
F, If the outdoor piping temperature is high, turn on the fan motor for a certain period of time.
N to turn the fan motor on or off for a certain period of time
Immediately after F, the detection and comparison of the outdoor pipe temperature and the output to the fan motor are repeated.

[0005] In addition, the operation of the outdoor unit fan motor is turned on for a predetermined time according to a set piping temperature having no differential.
Alternatively, in the present invention that is turned off for a fixed time, the operation time and the stop time are changed according to the outdoor temperature.

Also, the operation of the outdoor unit fan motor is turned on for a certain period of time according to a set piping temperature having no differential.
Alternatively, in the present invention, which is turned off for a certain time, the predetermined pipe temperature is changed depending on the outdoor air temperature.

In addition, the operation of the outdoor unit fan motor is turned on for a predetermined time depending on a set piping temperature having no differential.
Alternatively, in the present invention in which the outdoor unit is turned off for a predetermined time, the outdoor unit fan motor rotation speed is changed according to the outdoor temperature.

In addition, the operation of the outdoor unit fan motor is turned on for a predetermined time according to a set piping temperature having no differential.
Alternatively, in the present invention in which the compressor is turned off for a fixed time, the compressor operating frequency is defined by the outdoor air temperature.

[0009]

The operation of the above means is as follows.

According to the present invention, an outdoor load is detected based on a pipe temperature, and the detected pipe temperature is compared with a set pipe temperature having no differential. If the temperature is high, turn on the fan motor for a certain period of time, and then turn on or off the fan motor for a certain period of time.
The comparison and the output to the fan motor are repeated, and by shortening the cycle, the outdoor fan performs a random intermittent operation and can respond to the fluctuation of the outdoor load in a short time. Also, when the outdoor fan motor is in the ON range to the OFF range,
Since there is no temperature difference when shifting from the FF region to the ON region, that is, a set piping temperature without a differential, there is no operation that crosses the region as in the conventional case. In other words, the change range of the pipe temperature on the outdoor side is made irrespective of the outside air temperature. As a result, the refrigerating cycle is stabilized, and the change of the indoor side outlet temperature is eliminated, and the comfort is remarkably improved.

According to the present invention, an outdoor load is detected based on a pipe temperature and an outside air temperature, and the detected pipe temperature is compared with a set pipe temperature having no differential. If the pipe temperature is high, the fan motor is turned on for a certain period of time, and after the fan motor is turned on or off for a certain period of time, the detection and comparison of the pipe temperature and the output to the fan motor are repeated immediately. By making it shorter, the outdoor fan performs random intermittent operation, but by changing the operation time and stop time according to the outdoor temperature, the fluctuation range of the outdoor pipe temperature is further eliminated, and as a result, the refrigeration cycle is stabilized As a result, there is no change in the indoor side outlet temperature, and the comfort is remarkably improved.

According to the present invention, an outdoor load is detected based on a pipe temperature and an outside air temperature, and the detected pipe temperature is compared with a set pipe temperature having no differential. When the pipe temperature is OFF, the fan motor is turned on for a certain period of time, and the detection and comparison of the pipe temperature and the output to the fan motor are repeated immediately after the fan is turned on or off for a certain period. By shortening, the outdoor fan performs random intermittent operation to stabilize the pipe temperature, but by changing the set pipe temperature according to the outdoor temperature, the fluctuation range of the outdoor pipe temperature is eliminated, and as a result, The refrigeration cycle is stabilized, and the indoor-side blow-out temperature does not change in accordance with the outdoor-side load, and the comfort is further remarkably improved.

According to the present invention, an outdoor load is detected based on a pipe temperature and an outside air temperature, and the detected pipe temperature is compared with a set pipe temperature having no differential. When the pipe temperature is high, the fan motor is turned on for a certain period of time, and after the fan motor is turned on or off for a certain period of time, the detection and comparison of the pipe temperature and the output to the fan motor are repeated immediately. By shortening it, the outdoor fan performs random intermittent operation or changes the rotation speed of its fan motor according to the outdoor temperature, eliminating the fluctuation range of the outdoor piping temperature, and as a result, stabilizing the refrigeration cycle There is no change in the indoor outlet temperature, and the comfort is significantly improved.

According to the present invention, an outdoor load is detected based on a pipe temperature and an outside air temperature, and the detected pipe temperature is compared with a set pipe temperature having no differential. If the temperature is OFF, or the pipe temperature is high, the fan motor is turned ON for a certain period of time, and after the fan motor is turned ON or OFF for a certain time, the detection and comparison of the pipe temperature and the output to the fan motor are repeated immediately. , The outdoor fan performs random intermittent operation.However, the compressor operating frequency is regulated by the outdoor temperature, thereby eliminating the fluctuation range of the outdoor piping temperature, and as a result, stabilizing the refrigeration cycle. There is no change in the indoor outlet temperature, and the comfort is significantly improved.

[0015]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of the present invention.

First, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 2, reference numeral 1a denotes an outdoor pipe temperature thermistor, which inputs a temperature change to the microcomputer 2 as a divided voltage with the resistor Ra. The input pipe temperature Ta is compared by the microcomputer 2 with a preset pipe temperature Tb, and in FIG.
Determine the output data to

FIG. 4 is a flow chart of the first embodiment of the present invention. At the pipe temperature Ta detected by the outdoor pipe temperature thermistor and the set pipe temperature Tb, Ta> T
In the case of b, the outdoor fan motor is set to the counter n = n. OFF during When Ta <Tb, the outdoor fan motor is set to the counter n = n. ON during By repeating these operations, it is possible to finely cope with fluctuations in the outdoor load. That is, the fluctuation range of the pipe temperature on the outdoor side is eliminated, and as a result, the refrigeration cycle is stabilized, and the indoor outlet temperature does not change, and the comfort is remarkably improved.

A second embodiment of the present invention will be described with reference to FIGS. In FIG. 2, reference numeral 1a denotes an outdoor pipe temperature thermistor, which inputs a temperature change to the microcomputer 2 as a divided voltage with the resistor Ra. The input pipe temperature Ta is compared by the microcomputer 2 with a preset pipe temperature Tb, and in FIG.
Determine the output data to Reference numeral 1c denotes an outside air temperature thermistor, which inputs a temperature change to the microcomputer 2 as a divided voltage with the resistor Rc. The input outside air temperature data t is calculated by the microcomputer 2 in FIG.
And the outdoor fan motor operating time n. Outdoor fan motor stop time n. And determine them from the relationship.

The flowchart of the second embodiment of the present invention is the outdoor fan motor operation time n in the first embodiment.
And stop time n. Is exactly the same except that it is determined by the outside air temperature in FIG. By repeating the above operations, it is possible to respond more finely to changes in the outdoor load, that is, to eliminate the fluctuation range of the outdoor piping temperature, thereby stabilizing the refrigeration cycle and reducing the change in the indoor air temperature. And comfort is significantly improved.

A third embodiment of the present invention will be described with reference to FIGS. In FIG. 2, reference numeral 1c denotes an outside air temperature thermistor, and a temperature change is represented by a divided voltage with the resistance Rc.
Input to the microcomputer 2. Based on the input outside air temperature data t, the microcomputer 2 determines the set pipe temperature Tb from the relationship between the outside air temperature t and the set pipe temperature Tb shown in FIG. 1a is an outdoor pipe temperature thermistor, which inputs a temperature change to the microcomputer 2 as a divided voltage with the resistance Ra. Input pipe temperature T
a is the outside air temperature data t by the microcomputer 2.
The output data to the outdoor fan motor rotation speed variable circuit 3 is determined according to the magnitude of the set pipe temperature Tb determined in FIG.

The flowchart of the third embodiment of the present invention is completely the same except that the set pipe temperature Tb in the first embodiment is determined by the outside air temperature t in FIG. By repeating the above operations, it is possible to respond more finely to changes in the outdoor load, that is, to eliminate the fluctuation range of the outdoor piping temperature, thereby stabilizing the refrigeration cycle and reducing the change in the indoor air temperature. And comfort is significantly improved.

A fourth embodiment of the present invention will be described with reference to FIGS. In FIG. 2, reference numeral 1c denotes an outside air temperature thermistor, and a temperature change is represented by a divided voltage with the resistance Rc.
Input to the microcomputer 2. The input outdoor air temperature data is used by the microcomputer 2 to determine the outdoor fan motor rotation speed N from the relationship between the outdoor air temperature t and the outdoor fan motor rotation speed N shown in FIG. 1a is an outdoor pipe temperature thermistor, which inputs a temperature change to the microcomputer 2 as a divided voltage with the resistance Ra. The input pipe temperature Ta is compared with the set pipe temperature Tb by the microcomputer 2, and the output data to the outdoor fan motor rotation speed variable circuit 3 is determined based on their magnitude in FIG.

The flowchart of the fourth embodiment of the present invention shows that the output to the outdoor fan motor in the first embodiment is O.
Except that the outdoor fan motor speed N at the time of N is determined by the outside air temperature t in FIG. By repeating the above operations, it is possible to respond more finely to changes in the outdoor load, that is, to eliminate the fluctuation range of the outdoor piping temperature, thereby stabilizing the refrigeration cycle and reducing the change in the indoor air temperature. And comfort is significantly improved.

A fifth embodiment of the present invention will be described with reference to FIGS. 3, 8, and 9. In FIG. 8, reference numeral 1c denotes an outside air temperature thermistor, and a temperature change is represented by a divided voltage with the resistance Rc.
Input to the microcomputer 2. The input outside air temperature data t is defined by the microcomputer 2 to determine the compressor operation frequency f based on the relationship between the outside air temperature t and the compressor operation frequency f shown in FIG. . 1a is an outdoor pipe temperature thermistor, which inputs a temperature change to the microcomputer 2 as a divided voltage with the resistance Ra. The input pipe temperature Ta is compared with the set pipe temperature Tb by the microcomputer 2, and the output data to the outdoor fan motor rotation speed variable circuit 3 is determined based on their magnitude in FIG.

The flow chart of the fifth embodiment of the present invention is completely the same except that the compressor operating frequency in the first embodiment is defined by the outside air temperature in FIG. By repeating the above operations, it is possible to respond more finely to changes in the outdoor load, that is, to eliminate the fluctuation range of the outdoor piping temperature, thereby stabilizing the refrigeration cycle and reducing the change in the indoor air temperature. And comfort is significantly improved.

[0026]

As is clear from the above embodiment, the use of the annual cooling control method of the present invention prevents the freezing of the indoor heat exchanger in eliminating the change in the pipe temperature caused by the change in the outdoor air temperature. Needless to say, the fluctuation range of the indoor-side blowout temperature can be reduced irrespective of the outdoor temperature, and the comfort can be significantly improved.

Also, 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 at the time of the outdoor temperature and the indoor temperature change, and to stabilize the indoor blowout temperature regardless of the temperature change. it can.

Also, by changing the set pipe temperature at the outdoor temperature, the refrigerating cycle can be stabilized even when the outdoor temperature and the indoor temperature change, and the indoor blowout temperature can be stabilized regardless of the temperature change.

Further, the reliability of the outdoor fan motor is improved by changing the rotation speed of the outdoor fan motor in accordance with the outdoor air temperature and controlling the minimum rotation speed necessary to eliminate the variation width of the pipe temperature. Can be.

Also, the compressor operating frequency is regulated by the outdoor air temperature to stabilize the refrigerating cycle, 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. 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 configuration diagram of an embodiment of the present invention.

FIG. 2 is the same circuit diagram

FIG. 3 is a characteristic diagram of ON / OFF state of the outdoor fan and piping temperature.

FIG. 4 is a flowchart of the same.

FIG. 5 shows the relationship between the outside air temperature and the operation time and stop time of the outdoor fan motor.

FIG. 6 is a diagram showing a relationship between the outside air temperature and a set piping temperature.

FIG. 7 is a diagram showing the relationship between the outside air temperature and the number of rotations of an outdoor fan motor.

FIG. 8 is the same circuit diagram.

FIG. 9 is a diagram showing the relationship between the outside air temperature and the operating frequency of the compressor.

FIG. 10 is a diagram showing the ON / OFF state of an outdoor fan and the temperature of a pipe in a conventional example.

FIG. 11 is a diagram showing a piping temperature-outside air temperature characteristic of a conventional example.

[Explanation of symbols]

 1a Pipe temperature thermistor 1b High pressure side pressure thermistor 1c Outside air temperature thermistor 2 Microcomputer 3 Outdoor rotation speed variable circuit 4 Compressor operation frequency variable circuit

────────────────────────────────────────────────── ─── 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 13/00

Claims (5)

(57) [Claims] 1. A variable capacity air conditioner equipped with a heat exchanger that causes an outdoor unit to radiate heat during a cooling operation, a fan to promote the heat exchanger, and a fan motor to drive the heat exchanger. Outdoor pipe temperature detecting means for detecting the temperature, storage means for the set pipe temperature having no differential, comparing means for comparing them, and an outdoor fan for turning on or off the operation of the outdoor unit fan motor for a fixed time An annual cooling control device for an air conditioner equipped with a motor rotation speed varying means. 2. An outdoor air temperature detection means for detecting an outdoor air temperature, an outdoor air temperature storage means, and a control means for turning on or off an operation of the outdoor unit fan motor for a predetermined time according to a set pipe temperature having no differential. The annual cooling control device for an air conditioner according to claim 1, further comprising a comparison means for comparing the operation time and the stop time with the outdoor temperature. 3. An outdoor air temperature detection means for detecting an outdoor air temperature, an outdoor air temperature storage means, and a control means for turning on or off the operation of the outdoor unit fan motor for a predetermined time according to a set pipe temperature having no differential. 2. The annual cooling control device for an air conditioner according to claim 1, further comprising a comparing means for comparing the temperature of the piping with the outdoor air temperature. 4. An outdoor air temperature detecting means for detecting an outdoor air temperature, an outdoor air temperature storage means, and a control means for turning on or off the operation of the outdoor unit fan motor for a predetermined time according to a set pipe temperature having no differential. 2. The annual cooling control device for an air conditioner according to claim 1, further comprising a comparison unit for comparing the rotation speed of the outdoor unit and the outdoor unit fan motor according to the outdoor temperature. 5. An outdoor air temperature detecting means for detecting an outdoor air temperature, an outdoor air temperature storing means, and a control means for turning on or off an outdoor unit fan motor operation for a predetermined time according to a set piping temperature having no differential. 2. The annual cooling control device for an air conditioner according to claim 1, further comprising a comparison unit for comparing the compressor operation frequency and a compressor operation frequency variable unit, wherein the compressor operation frequency is defined by an outdoor air temperature.