JP3451918B2 - Operation 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 a temperature rise reducing operation control of a cooling energizing four-way valve, such as a refrigerant heating type air conditioner mainly for heating operation.

[0002]

2. Description of the Related Art Conventionally, in a refrigerant heating type air conditioner, a method of switching a flow of a refrigerant by not energizing a four-way valve drive during heating but energizing during cooling is often used. This is 4
Even if the one-way valve drive circuit breaks down, the heating operation, which is the main air conditioning function of the refrigerant heating type air conditioner, is the only operation function to ensure the minimum operation function.

The conventional four-way valve drive control will be described below with reference to the drawings. FIG. 8 is an operation block diagram showing conventional four-way valve control.

When the air conditioner is operated by the operating means 1, the mode determining means 6 selects the operating mode of heating or cooling. In a refrigerant heating type air conditioner, an energizing four-way valve during cooling is often used, and the four-way valve control means 8 is used.
Thus, the drive power supply is turned off during heating and the drive power supply is turned on during cooling operation. When the four-way valve control ends, the compressor driving means 11 starts the compressor operation. The heating and cooling operations are turned on / off depending on the set temperature and the actual room temperature.
The OFF determination means 7 controls the variable compression force, the operation, and the stop.

[0005]

However, the conventional control device for performing the cooling energization type four-way valve control has the following problems.

The ambient temperature in which the four-way valve is placed is low during heating, but is often extremely high during cooling. Due to this difference, the coil temperature rise due to the energization of the four-way valve becomes extremely severe during cooling in comparison with the heating energization type usage. While the compressor is operating, the temperature rise is suppressed to some extent by the heat absorption of the refrigerant flowing through the four-way valve.
The refrigerant circulation is stopped when the thermostat is turned off, and the coil temperature rises to an extremely high temperature in a high-temperature outdoor unit atmosphere state. In particular, the current existing 4-way valve with 200V specifications has a severe temperature rise value, and it is necessary to reduce the temperature as a reliability improvement measure to improve the operating life.

In view of the conventional problems, the present invention reduces the temperature rise of the energizing four-way valve during cooling when the thermostat is off,
The purpose is to improve the operating life of the four-way valve and ensure its performance.

[0008]

In order to solve the above-mentioned problems, the present invention is a four-way method for switching the flow of refrigerant between cooling and heating.
Valve and four-way valve control to control energization of the coil of this four-way valve
Control means and chopping the applied voltage after energizing the 4-way valve
It is characterized by comprising an applied voltage reducing means.

[0009]

The present invention cuts off the flow of the refrigerant in cooling and heating.
Controls the 4-way valve to be replaced and the energization of the coil of this 4-way valve.
Check the applied voltage after energizing the 4-way valve with the 4-way valve control means.
A thermo-O
In addition to reducing the temperature rise during FF, the temperature and power consumption are reduced even when the thermostat is turned on.

Furthermore, the operation of the four-way valve applied voltage reducing means is provided with an outdoor outside air temperature detecting means for switching between permission and prohibition according to a preset arbitrary outside air temperature, and it is necessary to cope with the temperature reduction. By judging the state, the chopping control of the applied power source is not performed when unnecessary, and unnecessary noise generating components due to this are suppressed.

Further, the operation of the 4-way valve applied voltage reducing means is provided with an energizing time measuring means for switching between permission and prohibition according to a preset 4-way valve continuous energizing time, thereby reducing the applied voltage. By providing the time until the sudden pressure change at the start of operation disappears, the voltage reduction control is performed. However, it achieves stable valve switching.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a control block diagram in the first embodiment of the present invention. FIG. 2 is an electric circuit diagram showing the same embodiment. FIG. 3A shows 4 in the same embodiment.
It is a one-way valve coil temperature rise time chart.

In FIG. 1, when a driving command for the air conditioner is issued from the driving means 1, the mode judging means 2 judges the driving mode. In this embodiment, a refrigerant heating type air conditioner is used, and the 4-way valve drive is controlled by the 4-way valve control means 8 so that energization is off during heating and energization is on during cooling. Then, the compressor driving means 11 starts the operation of the refrigeration cycle. Refrigerating cycle operation / stop control is thermo ON / O
It is judged by the FF judging means 7, and the compressor drive means 11 is instructed to start / stop, while the thermo-off time measuring means 9 for measuring the thermo-off time outputs a signal. Thermo OF
When the OFF time t1 is reached, the F clock means 9 gives a 4-way valve OFF signal to the 4-way valve control means 8.

As shown in the graph 2 of FIG. 3 (a), the energization of the four-way valve is turned off after the lapse of t1 from the thermostat OFF, and the coil temperature rise value rises to T2 when there is no OFF control. Will exhibit temperature drop characteristics.
When the thermo ON / OFF judging means 7 turns the thermo ON, energization is started and the temperature rises to T2. Therefore 4
Compared with the characteristic graph 1 when the one-way valve is continuously energized, there is a large difference between the maximum temperature rise reduction and the component temperature reduction when the thermostat is off.

(Embodiment 2) FIG. 4 is a control block diagram in the second embodiment of the present invention. FIG. 3B is a time chart of the 4-way valve coil temperature rise in the same embodiment. Since the basic configuration and control of the apparatus are the same as those of the first embodiment, description thereof will be omitted and only different control will be described.

At the start of the cooling operation, the power supply voltage is applied by the four-way valve driving means 8 as in the first embodiment. Immediately thereafter, chopping control of the applied voltage of the four-way valve applied voltage is performed by the applied voltage reducing means 10. FIG. 5 shows 4 of FIG.
It shows the voltage waveform chopped by the one-way valve driven SSR 14. According to this embodiment, FIG.
As shown in Graph 3, 4 regardless of whether the thermo is ON or OFF
It is possible to operate by increasing the temperature of the one-way valve coil by a few percent when 100% energized.

(Embodiment 3) FIG. 6 is a control block diagram in the third embodiment of the present invention. The basic operation is the first embodiment
The same as in the second embodiment, but the four-way valve is turned off when the thermostat is turned off, which is the coil temperature reduction control, according to the temperatures detected by the outside air temperature thermistor 18 and the outside air temperature detecting means 12 shown in FIG.
The control and the operation of the applied voltage reducing means are permitted / prohibited. As a result, the number of operations of the four-way valve and the drive circuit is reduced and the operating life is improved by excessive temperature protection control.

(Embodiment 4) FIG. 7 is a control block diagram in the fourth embodiment of the present invention. The present invention permits the operation of the applied voltage reducing means 10 of the second embodiment by providing the thermo-ON timing means 19 after a lapse of a fixed time from the start of the operation. This is because the voltage reduction control is performed after the sudden pressure change at the start of operation disappears, preventing malfunctions such as flapping of the 4-way valve due to pressure change, and stable valve switching even at low voltage. Is realized.

[0021]

[0022]

As is clear from the above embodiment, cooling,
The four-way valve that switches the flow of refrigerant with heating and this four-way valve
4-way valve control means for controlling energization to the coil and 4-way valve communication
A means for reducing the applied voltage that chops the applied voltage after charging
With the provision, not only the temperature rise is reduced when the thermostat is turned off, but also the temperature is reduced and the power consumption is reduced even when the thermostat is turned on.

Further, the operation of 4-way valve applied voltage reducing means,
By switching the permission / prohibition according to the preset outside air temperature, it is possible to judge the state in which temperature reduction is required, and when it is not necessary, chopping control of the applied power supply is not performed. This is to suppress the necessary noise generating component.

Further, the operation of 4-way valve applied voltage reducing means,
It is equipped with an energization time counting means for switching between permission and prohibition according to a preset 4-way valve continuous energization time. By providing a time until the applied voltage is reduced, a sudden pressure change at the start of operation can be prevented. Since the voltage reduction control is performed after it disappears, erroneous operation such as flapping of the four-way valve due to pressure change is prevented, and stable valve switching is realized even at low voltage.

[Brief description of drawings]

FIG. 1 is a control block diagram according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an electric circuit in the embodiment.

FIG. 3 is an explanatory diagram of temperature characteristics in the same embodiment.

FIG. 4 is a control block diagram according to a second embodiment of the present invention.

FIG. 5 is an explanatory view showing the same embodiment.

FIG. 6 is a control block diagram according to a third embodiment of the present invention.

FIG. 7 is a control block diagram according to a fourth embodiment of the present invention.

FIG. 8 is a control block diagram showing a conventional example.

[Explanation of symbols]

1 Indoor unit control device 2 Room temperature thermistor 3 Remote control receiver 4 Outdoor unit control device 5 Communication circuit 6 mode judgment circuit 7 Thermo ON / OFF judgment circuit 8 4-way valve control circuit 9 Thermo OFF timing circuit 10 Voltage chopping circuit 11 Compressor drive circuit 12 Outside temperature detection circuit 13 compressor 14 SSR 15 Power supply 16 4-way valve 17 oscillator 18 Outside temperature thermistor 19 Thermo ON timing circuit

Front Page Continuation (72) Inventor Toshihiko Nishimoto 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-3-244955 (JP, A) JP-A-58-140572 (JP) , A) JP-A-9-163795 (JP, A) JP-A-9-273799 (JP, A) JP-A-3-282166 (JP, A) Actually open 4-36567 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F24F 11/02 102

Claims (3)

(57) [Claims] 1. A refrigerant flow is switched between cooling and heating.
One-way valve and four-way valve for controlling energization of coils of this four-way valve
Control means and chopping the applied voltage after energizing the 4-way valve
An operation control device for an air conditioner, comprising: Wherein the operation of applying a voltage reducing means, predetermined permission by the outside air temperature, the operation control device for air conditioner according to claim 1, wherein providing the outdoor outside air temperature detecting means for switching prohibition. 3. The air conditioner according to claim 1 or 2 , further comprising energization time counting means for switching the operation of the applied voltage reducing means between permission and prohibition according to a predetermined four-way valve continuous energization time. Machine operation control device.