JPH038898Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention relates to air conditioners,
In particular, the present invention relates to an air conditioner that can suitably be used in combination with a floor radiant heater such as an electric carpet heater.

(Prior Art) The combined use of a heat pump type air conditioner and an electric heating type carpet is known, for example, as described in Japanese Patent Application Laid-Open No. 56-34030. In this air conditioner, the electric carpet heater is controlled so that the floor surface temperature remains constant, and if the energization rate to the heater is lower than 100%, the floor surface temperature remains approximately constant at that energization rate. If the heat pump air conditioner is judged to be maintained at In this case, it was determined that the floor surface temperature could not be kept constant despite 100% electricity being applied to the electric heater, and the heat pump type air conditioner was operated. In other words, the heating is mainly performed by the electric carpet, and when the heating capacity is insufficient with only the electric carpet heating, the heat pump air conditioner is controlled to operate.

(Problem to be solved by the invention) However, in the above-mentioned air conditioner, when the room temperature is low, such as immediately after the start of operation, a lot of electricity is required for both the electric heating carpet and the heat pump air conditioner. Therefore, a large capacity power supply circuit is required. However, as mentioned above, large capacity is required only in specific cases, such as immediately after starting operation, and it is therefore uneconomical to set the capacity of the power supply circuit large in consideration of such cases. .

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose was to constantly maintain the current in the power supply circuit at a predetermined value while using both a heat pump air conditioner and a floor radiant heater. To provide an air conditioner which can be maintained at the following temperature and therefore can be used together with a floor radiant heater even when the power supply capacity is small.

(Means for solving the problem) Therefore, in the air conditioner of this invention, a floor radiant heater such as an electric heating carpet 6 is connected to the power supply circuit 7 of the heat pump type air conditioner 1, and the room temperature is detected. A room temperature detection means 17, a rotation speed controller 10 for controlling the rotation speed of the compressor motor 11 of the heat pump air conditioner 1, and a compression function by operating the rotation speed controller 10 based on the detected temperature. Compression function force control means 1 for controlling force
2, respectively, and a floor temperature detection means 18 for detecting the temperature of the floor surface, and a floor temperature control means 16 for controlling the power supplied to the floor radiant heater 6 based on the detected temperature. , furthermore, current detection means 1 for detecting the current supplied to both the compressor motor 11 and the floor radiant heater 6.
9, and a current setting means 20 for setting the upper limit value of the current supplied to both 6 and 11, which compares the detected current value and the set current value, and compares the detected current value with the set current value. A control means 13 is provided for controlling the operation of the rotation speed controller 10 by the compression function force control means 12 so as not to exceed the rotation speed.

(Function) In the above air conditioner, when the detected temperature of the floor surface is low, the power supplied to the floor radiant heater 6 is increased by the floor temperature control means 16, and when the detected room temperature is low, the power supplied to the floor radiant heater 6 is increased. An attempt is made to increase the power supplied to the compressor motor 11 by the functional power control means 12. However, the total current supplied from the power supply circuit 7 to both the compressor motor 11 and the floor radiant heater 6 is detected by the current detection means 19, and this current value does not exceed the set current value. Since the total current is controlled by the control means 13 in this manner, the total current is always maintained below the set current value. The control of the total current by the control means 13 is performed by giving priority to the floor radiant heater 6 side and adjusting the current output from the rotation speed controller 10 to the compressor motor 11.

(Example) Next, a specific example of the air conditioner of this invention will be described in detail with reference to the drawings.

In Fig. 2, 1 indicates the entire heat pump type air conditioner, and this air conditioner 1 is as follows:
It has an indoor unit 2 and an outdoor unit 3. 4 is a connector, and a wiring 5 is connected to this connector 4,
An electric heating carpet 6 as an example of a floor radiant heater is connected. Note that an outlet C is connected to the indoor unit 2.

Fig. 1 shows the control circuit of the above air conditioner.
In the figure, 7 is a power supply circuit, and a breaker 8, the connector 4, a rectifier circuit 9, and a frequency converter 10 are connected in series to the power supply circuit 7 in order from the primary side. converter 1
The zero output is supplied to the compressor motor 11.
The frequency converter 10 serves as a rotation speed controller for controlling the rotation speed of the compressor motor 11, and this frequency converter 10 includes a frequency control means 12 for controlling its operation. The frequency control means 12 is further connected to the control means 13 . Note that this frequency control means 12 serves as a compression function power control means for controlling the capacity of the compressor via the frequency converter 10. On the other hand, the breaker 8 and the rectifier circuit 9
A triax 15 is connected in series to the heater 14 of the electric heating type carpet 6 connected between the heater 14 and the heater 14, and the energization rate to the heater 14 is controlled by the output of the bed temperature control means 16 for the triax 15. The floor temperature can also be controlled.

Four types of signals are input to the control means 13 as shown in the figure. The first is a detection signal from the thermistor 17 as room temperature detection means, and based on this signal, the control means 13:
A signal proportional to the temperature difference between the detected room temperature and the set temperature is output to the frequency control means 12, and the frequency control means 12 controls the frequency converter 10 based on this signal.
to control the power supplied to the compressor motor 11. Further, the second signal inputted to the control means 13 is a detection signal from the thermitas 18 as a bed temperature detection means for detecting the temperature of the floor surface, and the control means 13 detects the temperature based on this signal. A signal proportional to the temperature difference between the floor temperature and the reference temperature is output to the floor temperature control means 16. Floor temperature control means 1
6 controls the power supplied to the heater 14 by controlling the operation of the triax 15 based on this signal. Note that the above-mentioned triax 15 controls the power supplied to the heater 14.
It is also possible to use methods other than using . Furthermore, the third signal input to the control means 13 is
This is a detected current signal from a transformer 19 serving as a current detection means.The transformer 19 is placed closer to the breaker 8 than the connector 4, and the transformer 1
9, the total current supplied to both the compressor motor 11 and the electric heating carpet 6 can be detected. Furthermore, the control means 1
The fourth signal inputted to No. 3 is a reference current signal from current setting means 20 for setting the upper limit value of the total current. The control means 13 has the function of comparing the detected current value with a reference current value and controlling the operation control of the frequency converter 10 by the frequency control means 12 so that the detected current value does not exceed the reference current value. It is something.

Hereinafter, the operating state of the air conditioner will be explained based on the flowchart shown in FIG.
First, at the start of operation, the input I0 to the electric heating carpet 6 is initialized as in step S1. At this time, the input is preferably about 1/3 of the set upper limit current value m. After the start of operation, the input I1 to the compressor motor 11 of the heat pump air conditioner 1 is determined based on the room temperature detected by the thermistor 17 in step S2, and the input I1 is determined by the transformer 19 in step S3. Total current (0
+1) is detected. Then, in step S4, the detected current value (0+1) is compared with the reference current value m, and if the detected current value (0+1) exceeds the reference current value m, the process proceeds to step S5.
lowering the input to the compressor motor 11 at
Then, the process returns to step S3 and repeats the above operation. On the other hand, if the detected current value (0+1) is less than the reference current value m, it is determined in step S6 whether or not the floor surface temperature detected by the thermistor 18 is an appropriate temperature (usually 26 to 30 DEG C.).
If the temperature is appropriate, return to step S2 and repeat the above operation, while if the temperature is not appropriate,
In step S7, the input I0 to the electric heating carpet 6 is determined, and then the process returns to step S2 to repeat the above operation. Note that it is practically sufficient to perform monitoring using the flowchart as described above once every 30 minutes.

FIG. 4 shows another embodiment of the control method, but this is not a case where the input to the electric heating carpet 6 is continuously variable, but a control method for a mechanism that is ON-OFF controlled. This is an example. First, in step S1, the compressor motor 11 is activated based on the room temperature detected by the thermistor 17.
The total current value (I0 +
I1) is detected. Then, it is determined in step S3 whether or not the detected current value (I0+I1) exceeds the reference current value Im. If it does not exceed the reference current value Im, the process returns to step S2, whereas if it exceeds the reference current value Im, the process returns to step S4. Input I1 to compressor motor 11 at
Then, the process returns to step S2. In the above example, electric heating carpet 6 is ON.
The maximum current that can be supplied to the compressor motor 11 changes in response to -OFF.

As a result of the above-mentioned control, the current value flowing through the breaker 8 changes when the air conditioner 1 is operated alone, when the electric heating carpet 6 is used together, and when the input to the electric heating carpet 6 changes. Therefore, even if the capacity of the power supply circuit 7 is small, the electric heating carpet 6 can be used in combination. As mentioned above, when the electric heating carpet 6 is used in combination, the heating capacity of the air conditioner 1 is regulated, so there is a concern that the quick heating performance may be impaired. It has been confirmed that because the temperature rises, the feeling of rapid heating is better than when the air conditioner 1 is operated alone. Furthermore, when the electric heating carpet 6 is used together, the indoor temperature can be set lower by about 4 to 6 degrees Celsius, so even if the maximum heating capacity of the air conditioner 1 is lowered as described above, no particular problem will occur. .

Note that in the above embodiment, the compressor motor 11
An example is shown in which the frequency converter 10 is used as a rotation speed controller to control the rotation speed of the compressor. A numerical controller may also be used, in which case a corresponding type of compressor power control means is used.

(Effect of the invention) In the air conditioner of this invention, when a heat pump type air conditioner and a floor radiant heater such as an electric heating carpet are used together, power is supplied preferentially to the floor radiant heater. On the other hand, since the power supplied to the compressor motor of the heat pump air conditioner is controlled so that the total current is below a certain value, the current required for the power supply circuit is always below the certain current value. Therefore, without increasing the power supply capacity, it is possible to perform comfortable heating with the same capacity as conventional floor radiant heaters.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an example of the control circuit of the air conditioner of this invention, Fig. 2 is an explanatory diagram showing the overall schematic configuration of the air conditioner, and Fig. 3 is a diagram showing the control method for the air conditioner. FIG. 4 is a flowchart for explaining one example, and FIG. 4 is a flowchart for explaining another example of the control method. 1...Air conditioner, 6...Electric heating carpet, 7
...Power supply circuit, 10...Frequency converter, 11...Compressor motor, 12...Frequency control means, 13...
Control means, 17...room temperature thermistor, 18...bed temperature thermistor, 19...transformer, 20...current setting means.

Claims (1)

[Scope of utility model registration request] A floor radiant heater such as an electric heating carpet 6 is connected to the power supply circuit 7 of the heat pump air conditioner 1,
a room temperature detection means 17 for detecting the room temperature; a rotation speed controller 10 for controlling the rotation speed of the compressor motor 11 of the heat pump type air conditioner 1; A compression function force control means 12 is provided to control the capacity of the compressor through operation, and a floor temperature detection means 18 is provided to detect the temperature of the floor surface, and the floor radiant heating is performed based on the detected temperature. bed temperature control means 16 for controlling the power supplied to the machine 6; Current setting means 20 for setting the upper limit value of the current supplied to both 6 and 11
and a control means that compares the detected current value and a set current value and controls the operation of the rotation speed controller 10 by the compression function force control means 12 so that the detected current value does not exceed the set current value. An air conditioner characterized by having 13.