JP3606755B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner that performs indoor air conditioning.
[0002]
[Prior art]
As shown in FIG. 7, an electric circuit of a conventional separation-type air conditioner capable of cooling and heating is composed of an indoor unit 1, an outdoor unit 2, and an internal / external connection wire 3 that electrically connects them to each other. Yes. The indoor unit 1 includes a main body switch 4, an indoor electronic control unit 5, an indoor fan motor 6 such as a transistor motor, and a louver motor 7 for driving indoor upper and lower blades. The outdoor unit 2 includes an outdoor electronic control device 8, a four-way valve 9 that switches a refrigerant path according to a refrigeration cycle and a heating cycle, an outdoor fan motor 10 such as an induction motor, and a compressor that compresses the refrigerant. 11.
[0003]
The operation of the separation type air conditioner will be described below.
[0004]
The indoor unit 1 is connected to a commercial power source 12, and when the main body switch 4 of the indoor unit 1 is turned on, power is supplied to the indoor electronic control unit 5 to start the control operation, and the indoor fan motor 6 and the louver The motor 7 is rotated to start the circulation of room air through an indoor heat exchanger (not shown). Here, when the user instructs to start the operation, the indoor electronic control unit 5 controls the main relay (not shown) to be in a connected state, and supplies the commercial power supply 12 to the outdoor unit 2. At this time, electric power from the commercial power supply 12 is supplied to the outdoor electronic control device 8, and the outdoor electronic control device 8 starts a control operation, applies an instruction voltage to the compressor 11 to start rotation, The commercial power supply 12 is also connected to the outdoor fan motor 10, and as a result, the outside air is started to be sent to the outdoor heat exchanger (not shown). The four-way valve 9 that switches the refrigerant flow path is in a position to flow the refrigerant to the cooling cycle path when the commercial power supply 12 is not connected according to an instruction from the outdoor electronic control unit 8. In this state, the air conditioner starts a cooling operation.
[0005]
Next, when the user designates and inputs the heating operation, the outdoor electronic control device 8 connects the commercial power supply 12 to the four-way valve 9. By this operation, the refrigerant path is switched to the heating cycle side and the heating operation is started. At this time, outdoor air is sent to the outdoor heat exchanger by the outdoor fan motor 10 and heat of the outdoor air is taken into the refrigerant by the outdoor heat exchanger, so that the refrigerant evaporates and vaporizes, and the refrigerant is compressed by the compressor 11. And sent to the indoor heat exchanger.
[0006]
In any case, an instruction voltage obtained by amplifying or reducing the commercial power source 12 based on a ratio corresponding to the operating frequency of the compressor 11 by the outdoor electronic control device 8 is applied to the compressor 11.
[0007]
[Problems to be solved by the invention]
However, in the configuration of the conventional air conditioner, since the output voltage to the compressor is determined only by the voltage of the commercial power source, the output voltage to the compressor varies due to the voltage variation of the commercial power source, and the compressor torque changes. The compressor may fail to start. Furthermore, at the time of restart when the pressure balance of the compressor is not balanced, there is a problem that an optimum voltage is not applied and the compressor of the DC motor cannot be started due to insufficient starting torque.
[0008]
An object of the present invention is to provide an air conditioner that reduces the influence of the output voltage to the compressor due to voltage fluctuations of the commercial power supply and improves the starting ability in consideration of the load of the compressor at the time of starting. It is.
[0009]
[Means for Solving the Problems]
Air conditioner of the present invention is the air conditioning apparatus to start is applied to the power supply circuit of the compressor set power signal in accordance with the voltage value of the commercial power supply at startup, detecting the shell temperature of the compressor And a voltage correction control unit that determines the optimum output voltage to the compressor by correcting the power signal based on a stop period of the compressor and a detection signal from the shell temperature detection unit. The voltage correction control unit corrects the power supply signal based on the detection signal from the shell temperature detection means, and the temperature characteristics of the oil viscosity of the motor inside the compressor and the generation of the motor The correction is performed by calculation using the temperature characteristic of the magnetic force .
[0010]
According to the present invention, it is possible to reduce the influence of the output voltage to the compressor due to the voltage fluctuation of the commercial power supply and improve the starting ability in consideration of the load of the compressor at the time of starting.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention is an air conditioner that is activated by applying a power signal set in accordance with a voltage value of a commercial power source at the time of startup to a power circuit of the compressor. A shell temperature detecting means for detecting a shell temperature, and a voltage for correcting the power signal and determining an optimum output voltage to the compressor based on a stop period of the compressor and a detection signal from the shell temperature detecting means A correction control unit, and when the voltage correction control unit corrects the power supply signal based on a detection signal from the shell temperature detection means, a temperature characteristic of oil viscosity of a motor inside the compressor; is obtained by the air conditioner which is characterized in that the correction by calculation using the temperature characteristic of the generation force of the motor, starting with reducing the influence of the output voltage to the compressor by the voltage fluctuation of the commercial power supply The load of the compressor can be improved activation ability in consideration.
[0016]
Hereinafter, an activation control method for an air conditioner and an air conditioner according to the present invention will be described based on specific embodiments.
[0017]
(Embodiment 1)
The air conditioner of Embodiment 1 shown in FIG. 1 is a separation type air conditioner configured by an outdoor unit 1, an indoor unit 2, and an internal / external connection electric wire 3 that connects them as in the conventional example shown in FIG. 7. However, it is different from the conventional example in that a voltage correction circuit 13 as a voltage correction control unit and a compressor stop time counter 14 for measuring the stop period of the compressor 11 are added.
[0018]
The voltage correction circuit 13 corrects a power signal set according to the voltage value of the commercial power supply 12 at the time of start-up based on the stop period of the compressor 11 and applies it to the power supply circuit of the compressor 11. As shown in FIG. 2, the circuit includes a voltage detection circuit 15, receiving means 16, and an arithmetic circuit 17. The compressor stop time counter 14 is provided inside the indoor electronic control unit 5.
[0019]
Here, the starting operation of the separation type air conditioner will be described below.
[0020]
Note that the compressor 11 is started in a state in which the compressor 11 is stopped for a sufficiently long period and the pressure balance of the compressor 11 is maintained.
[0021]
As shown in FIG. 1, the main unit switch 4 of the indoor unit 1 is turned on, the electric power from the commercial power supply 12 is supplied to the indoor electronic control unit 5 and the control operation is started. When an input instruction is given, the electric power from the commercial power supply 12 is supplied to the outdoor electronic control device 8 via the indoor electronic control device 5 and supplied to the voltage correction circuit 13.
[0022]
As shown in FIG. 2, the voltage detection circuit 15 detects an input voltage at the time of startup from the commercial power supply 12 supplied to the outdoor electronic control device 8. That is, the voltage fluctuation of the commercial power supply 12 is detected. The voltage detection circuit 15 outputs the detected input voltage to the reception unit 16 as the power supply voltage signal S1.
[0023]
The receiving means 16 receives the power supply voltage signal S 1 and the stop period signal S 2 indicating the stop period of the compressor 11 read from the compressor stop time counter 14 in response to an instruction from the arithmetic circuit 17, and sends it to the arithmetic circuit 17. Output.
[0024]
The arithmetic circuit 17 sets the duty of the input voltage from the commercial power supply 12 according to the power supply voltage signal S1 so that the output voltage to the compressor 11 becomes the optimum output voltage corresponding to each operating frequency when the rated range voltage is applied. The optimum output voltage V1 thus applied is applied to the power supply circuit of the compressor 11 to start the compressor 11. Here, the arithmetic circuit 17 detects that the stop period of the compressor 11 has been sufficiently long based on the stop period signal S2, and assumes that the compressor 11 has the optimum output voltage V1 because the pressure balance of the compressor 11 is balanced. It is determined that no correction is required during the stop period.
[0025]
Since the compressor 11 is balanced in pressure, it starts normally with only the optimum output voltage V1 and starts the operation of compressing the refrigerant.
[0026]
When an operation stop instruction is input by the user during the operation of the compressor 11, the indoor electronic control unit 5 controls the main relay (not shown) to be in a disconnected state, and the electric power from the commercial power supply 12. The supply to the outdoor electronic control unit 8 is stopped, and the compressor 11 is stopped.
[0027]
When the compressor 11 stops, the compressor stop time counter 14 starts measuring the stop period of the compressor 11.
[0028]
Here, the restarting operation of the separation type air conditioner will be described below.
[0029]
When the user inputs an operation start instruction to restart the compressor 11 within a short period of time (for example, about 1 minute) after the compressor 11 is stopped, the indoor electronic control unit 5 causes the main relay ( The power from the commercial power supply 12 is supplied to the outdoor electronic control device 8 via the indoor electronic control device 5 and supplied to the voltage correction circuit 13.
[0030]
The voltage detection circuit 15 detects the input voltage from the commercial power supply 12 supplied to the outdoor electronic control device 8 and outputs the power supply voltage signal S1 to the receiving means 16 as described above.
[0031]
The receiving means 16 receives the power supply voltage signal S 1 and the stop period signal S 2 indicating the stop period of the compressor 11 read from the compressor stop time counter 14 in response to an instruction from the arithmetic circuit 17, and sends it to the arithmetic circuit 17. Output.
[0032]
The arithmetic circuit 17 uses the optimum output voltage V1 set according to the power supply voltage signal S1 so that the output voltage to the compressor 11 becomes the optimum output voltage corresponding to each operating frequency when the rated range voltage is applied. Correction is made based on the stop period signal S2 from the stop time counter 14, and the corrected optimum output voltage V2 is applied to the power supply circuit of the compressor 11 to restart the compressor 11.
[0033]
Specifically, when the stop period of the compressor 11 is short (for example, when the stop period is within one minute), the pressure balance of the compressor 11 is not balanced and is set according to the power supply voltage signal S1. Since the starting torque is insufficient only with the optimum output voltage V1 that has been set, correction for increasing the average value of the optimum output voltage V1 based on the stop period signal S2 (for example, increasing the duty value to increase the average value of the output voltage) Correction) is executed, the corrected optimum output voltage V2 is applied to the power supply circuit of the compressor 11, and the compressor 11 is restarted. The correction amount that increases the average value of the optimum output voltage V1 based on the stop period signal S2 is set to decrease as the stop period becomes longer, for example.
[0034]
When the stop period of the compressor 11 is sufficiently long, since the pressure balance of the compressor 11 is maintained, the compressor 11 can be started only by the optimum output voltage V1, and thus the average of the optimum output voltage V1. It is set not to execute correction to increase the value.
[0035]
In either case of cooling or heating, the optimum output voltage determined by the voltage correction circuit 13 is applied to the compressor 11.
[0036]
Since it comprised in this way, while being able to reduce the influence of the output voltage to the compressor 11 by the voltage fluctuation of the commercial power source 12, the load of the compressor 11 at the time of starting can be considered based on the stop period of the compressor 11. , Start ability can be improved.
[0037]
(Embodiment 2)
As shown in FIG. 3, the air conditioner according to the second embodiment of the present invention has a compressor shell temperature detection sensor 18 that detects the shell temperature of the compressor 11 in the separation type air conditioner according to the first embodiment described above. As shown in FIG. 4, the voltage correction circuit 13 corrects the power supply signal set according to the voltage value of the commercial power supply 12 at the start-up based on the detection signal S3 from the compressor shell temperature detection sensor 18. The difference is that the optimum output voltage to the compressor 11 is determined.
[0038]
The voltage correction circuit 13 includes a voltage detection circuit 15, a receiving unit 16a, and an arithmetic circuit 17a.
[0039]
Here, the restarting operation of the separation type air conditioner will be described below.
[0040]
The arithmetic circuit 17 a includes a power supply voltage signal S 1 from the voltage detection circuit 15, a compressor 11 stop period signal S 2 measured by the compressor stop time counter 14, and a compressor 11 detected by the compressor shell temperature detection sensor 18. The detection signal S3 related to the shell temperature is input via the receiving means 16a.
[0041]
The arithmetic circuit 17a uses an optimum output voltage V1 set according to the power supply voltage signal S1 so that the output voltage to the compressor 11 becomes an optimum output voltage corresponding to each operating frequency when the rated range voltage is applied. Correction is made based on the stop period signal S2 from the stop time counter 14 to tentatively determine the optimum output voltage V2, and this tentatively determined optimum output voltage V2 is further based on the detection signal S3 from the compressor shell temperature detection sensor 18. Thus, the final optimum output voltage V3 is determined, and this final optimum output voltage V3 is applied to the power supply circuit of the compressor 11 to restart the compressor 11.
[0042]
Specifically, when the shell temperature of the compressor 11 is low (for example, about −15 ° C.), the oil viscosity of the motor of the compressor 11 is high and the starting torque is insufficient. Is corrected based on the detection signal S3 from the compressor shell temperature detection sensor 18 (for example, correction for increasing the average value of the output voltage by increasing the duty) to obtain the final optimum output voltage V3 is determined, and this final optimum output voltage V3 is applied to the power supply circuit of the compressor 11 to restart the compressor 11. For example, the correction amount for increasing the average value of the optimum output voltage V2 based on the detection signal S3 is set to be larger when the shell temperature is lower than when the shell temperature is high.
[0043]
Since it comprised in this way, the further improvement of starting ability can be implement | achieved by detecting the shell temperature of the compressor 11 and correct | amending the optimal output voltage to the compressor 11 in consideration of the magnetic force characteristic of a DC motor.
[0044]
(Embodiment 3)
As shown in FIG. 5, an air conditioner according to Embodiment 3 of the present invention includes a suction temperature sensor 19 as an indoor temperature detecting means for detecting an indoor temperature in the separation type air conditioner according to Embodiment 1 described above. And an outside temperature sensor 20 as an outside temperature detecting means for detecting the outside temperature. As shown in FIG. 6, the voltage correction circuit 13 is connected to the indoor temperature detection signal S4 from the suction temperature sensor 19 and the outside temperature sensor 20. The difference is that the optimum output voltage to the compressor 11 is corrected and determined based on the outside air temperature detection signal S5.
[0045]
The voltage correction circuit 13 includes a voltage detection circuit 15, a receiving unit 16b, and an arithmetic circuit 17b.
[0046]
Here, the restarting operation of the separation type air conditioner will be described below.
[0047]
As shown in FIG. 6, the arithmetic circuit 17 b includes a power supply voltage signal S 1 from the voltage detection circuit 15, a compressor 11 stop period signal S 2 measured by the compressor stop time counter 14, and a suction temperature sensor 19. The room temperature detection signal S4 and the outside temperature detection signal S5 from the outside temperature sensor 20 are input via the receiving means 16b.
[0048]
The arithmetic circuit 17b uses the optimum output voltage V1 set according to the power supply voltage signal S1 so that the output voltage to the compressor 11 becomes the optimum output voltage corresponding to each operating frequency when the rated range voltage is applied. Correction is made based on the stop period signal S2 from the compressor stop time counter 14 to tentatively determine the optimum output voltage V2, and the tentatively determined optimum output voltage V2 is further converted into the indoor temperature detection signal S4 and the outside air temperature detection signal S5. The final optimum output voltage V4 is determined based on the correction, and the final optimum output voltage V4 is applied to the compressor 11 to restart the compressor 11.
[0049]
Specifically, when it is determined that the starting torque of the compressor 11 is insufficient due to the large difference between the room temperature and the outside air temperature based on the room temperature detection signal S4 and the outside air temperature detection signal S5, for example, Correction is performed to increase the average value of the output voltage by increasing the duty.
[0050]
Since it comprised in this way, based on indoor temperature detection signal S4 and outside temperature detection signal S5, the load of the compressor 11 can be calculated just before starting from the difference of indoor temperature and outside temperature, and starting after a long time stop The output voltage to the compressor 11 can be optimized by correcting the optimum output voltage to the compressor 11 in consideration of the characteristics of the refrigerant at the time.
[0051]
In each of the embodiments described above, the input power from the commercial power supply 12 is corrected by duty control, but power other than duty control such as correction by increasing or decreasing the peak value of the input power from the commercial power supply 12 is used. Even the correction has the same effect.
[0052]
【The invention's effect】
As described above, according to the first aspect of the present invention, an air conditioner that is activated by applying a power signal set in accordance with the voltage value of the commercial power source at the time of activation to the power circuit of the compressor. The shell temperature detecting means for detecting the shell temperature of the compressor, and the optimum power to the compressor by correcting the power supply signal based on the stop period of the compressor and the detection signal from the shell temperature detecting means. A voltage correction control unit for determining an output voltage, wherein the voltage correction control unit corrects the power supply signal based on a detection signal from the shell temperature detection means, and performs an oil of a motor inside the compressor. By correcting using the temperature characteristic of the viscosity of the motor and the temperature characteristic of the magnetic force generated by the motor, the influence of the output voltage to the compressor due to the voltage fluctuation of the commercial power supply is reduced and the compressor load It is possible to improve the starting ability in consideration.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an electric circuit of a separation-type air conditioner according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing a configuration of a voltage correction circuit according to Embodiment 1. FIG. FIG. 4 is a block diagram showing a configuration of a voltage correction circuit according to the second embodiment. FIG. 5 is a separation type according to the third embodiment of the present invention. FIG. 6 is a block diagram showing a configuration of a voltage correction circuit according to the third embodiment. FIG. 7 is a block diagram showing an electric circuit of a conventional separation-type air conditioner. Description】
13 Voltage correction circuit 14 Compressor stop time counter 15 Voltage detection means 16 Reception means 17 Operation circuit 16a Reception means 17a Operation circuit 16b Reception means 17b Operation circuit 18 Compressor shell temperature detection means 19 Suction temperature sensor 20 Outside air temperature sensor

Claims (1)

An air conditioner that starts by applying a power signal set in accordance with a voltage value of a commercial power source at the time of startup to a power circuit of the compressor,
Shell temperature detecting means for detecting the shell temperature of the compressor;
A voltage correction controller that corrects the power supply signal to determine an optimum output voltage to the compressor based on a stop period of the compressor and a detection signal from the shell temperature detection unit;
And the voltage correction control unit corrects the power supply signal based on the detection signal from the shell temperature detection means, and the temperature characteristic of the oil viscosity of the motor inside the compressor and the generated magnetic force of the motor. An air conditioner that performs correction by calculation using the temperature characteristics of the air conditioner.

Images