JPS5947208B2 - Heat pump type heater control device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control device for a heat pump type heater.

In the heat pump type heater, as shown in Fig. 1, independent blowing fans 2 and 3 are provided above and below the indoor unit 1, respectively, and indoor air is passed through the heat exchanger 4 to perform heating operation. be.

According to this heater, the floor surface can be warmed by the warm air from the bottom blowing fan, and the indoor space can be warmed by the top blowing fan.

However, in general, heat pump type heaters have insufficient heating capacity for a while after starting operation, and to prevent the effects of cold air, they are kept for a specified period of time (usually about 3 to 1
(0 minutes) is controlled to reduce the air volume.

When such control is performed, in a heater having upper and lower blowing fans, it is preferable to stop or rotate the lower blowing fan 3, which is strongly affected by cold air, at a low speed.

In other words, the wind from the top blowing fan 2 is less likely to directly hit the human body.

On the other hand, even when starting operation when the room temperature is low, it is desirable to use the same method as described above in order to prevent the influence of cold air caused by entrainment of the blown air.

After that, when the room temperature rises and the compressor 50 is turned on and off to control the temperature at a constant temperature, the air blowing is usually weakened while the compressor 5 is stopped so that the user does not feel the cold air only due to air blowing. .

However, as mentioned above, controlling the compressor 5 on and off for temperature control (see dotted lines and C in Figure 5a) causes a large energy loss in compressing the refrigerant, and changes in the temperature of the blowing air are harmful to the human body. It causes a feeling of pleasure.

The present invention has been made in order to eliminate the drawbacks of the above-mentioned conventional devices, and provides a heater control device that can significantly reduce the number of times the compressor is turned on and off, and that can significantly suppress temperature changes in the space below. The purpose is to do.

The present invention will be described in detail below based on illustrated embodiments.

First, Figure 2 shows the heating cycle. In the figure, 1 is the aforementioned indoor unit, 5 is a compressor, 6 is a four-way valve, 7 is a capillary tube, 8 is an outdoor heat exchanger, and 9 is an outdoor fan, all of which are well known.

Next, FIG. 3 is a circuit diagram showing the configuration of a heater control device and a heater according to the present invention.

In FIG. 3, 10 is an indoor heat exchanger temperature sensor that detects the indoor heat exchanger temperature of the indoor unit 10, 11 is a temperature sensor that detects the indoor temperature (hereinafter referred to as room temperature), and 12 is the detection of surface temperature sensors 10 and 11. This is an electronic control section that receives signals as input and outputs control signals to the indoor upper and lower blowing fans 2, 3, the compressor 5, and the outdoor fan 9. The detailed circuit is shown in FIG.

13 is a relay switch for controlling the operation of the upper blowing fan 2 on and off, 14 is a relay switch for the lower blowing fan 3, 15 is a heating/cooling switching relay switch, 16 is a high capacity switching relay switch for the compressor 5, and 17 is a compression switch. 18 is a power transformer for the electronic control unit 12; 19 is a power switch; 2
0 is a terminal board.

Note that the ffJ45 consists of small units of 5A and 5B, and when only 5A is operated, the capacity is small, and when 5A and 5B are operated together, the capacity is high.

FIG. 4 shows one circuit side of the electronic control section 12.

In the figure, 21 is a first comparison control circuit which inputs the detection signal TD of the room temperature sensor 11 and combines this detection signal TD and the set room temperature T.
2, when the room temperature TD is lower than the set value T2, a high capacity command signal is output to operate the compressor 5 at high capacity, and when the room temperature TD is higher than the set value T2, the compressor 5 is operated at low capacity. It outputs a low-capacity command signal for operation.

22 is a second comparison control circuit, and indoor heat exchanger temperature sensor 1
0 detection signal Td is input, and this detection signal Td and the set heat exchanger temperature T.

, and T1('I't>To), and using the fact that the room temperature exceeds the set value T2 as a condition signal,
When the detected value is larger than the set value To and smaller than T1, the lower blower fan 3 is rotated at a lower speed than the top blower fan 2 (for example, the upper blower fan 2 is activated and the lower blower fan is stopped).

), the detected value is greater than the set value T1 and the room temperature is equal to the set value T
2, the upper and lower blowing fans 2 and 3 are rotated at the same speed, and when the detected value is larger than the set value T1 and the room temperature exceeds the set value T2, the upper blowing fan 2 is rotated more than the lower blowing fan 3. Rotate at low speed (for example, the upper blowing fan 2 is stopped and the lower blowing fan is activated).

) outputs a signal. The first comparison control circuit 21 has three comparators 23, 24, 25, and a setting volume 26 and a diode 27, 28 to set three points corresponding to ±ICdeg) with respect to the setting value T2, that is, (T2-L
l), T2, and (T2+1) are compared with the detected value TD.

29 and 30 are inverters, 31 and 32 are flip-flops for switching compression function power, 33 is an AND gate, 34 is an outdoor fan drive signal output terminal, 35 is a low capacity signal output terminal,
36 is a high capacity signal output terminal.

The second comparison control circuit 22 includes two comparators 37.3
8 and set value T by resistor 39.40.

and T1 are given and compared with the detected value Td.

41 is a resistor, 42 and 43 are feedback resistors, 44 is an AND gate that takes the logical product of the output of the comparator 38 and the output of the inverter 30, 45 is a drive signal output terminal for the indoor lower blowing fan 3, and 46 is the upper blowing fan 2 This is the drive signal output terminal.

Next, the operation will be explained.

As mentioned before, the heating capacity is insufficient for a while after the start of operation, and the temperature of the heat exchanger 4 is low.

Now, the heat exchanger temperature Td is higher than the set value To and the set value T
Consider the case where the value is lower than 1 (To<T d<TI ) (see FIG. 5a).

At the same time, the room temperature TD is also lower than the set value T2 (TD<T2).

It is assumed that both the heat exchanger temperature sensor 10 and the room temperature sensor 11 generate outputs proportional to temperature.

When the operation is started in the state of (Td<T1) and (TD<T2), the first comparison control circuit 21 selects the comparator 2.
4 and 25 output an L level, and a high capacity command signal of an H level, that is, a signal that causes the compressors 5A and 5B to work together, is output from the output terminal 36 via the flip-flop 32 (FIG. 5b).

At this time, the output of the inverter 30 is at H level and is input to the AND gate 44.

On the other hand, in the second comparison control circuit 22, the comparator 38 is high.
Since the logic condition of the AND gate 44 is satisfied, the drive signal for the top blowing fan 2 at the H level is output from the output terminal 46 (FIG. 5d).

At this time, the output of the output terminal 45 is at L level, so the lower blowing fan 3 is stopped.

(Figure 5e).

Next, when the room temperature TD and the heat exchanger temperature Td rise over time and Td exceeds the set value T1, the output of the comparator 37 of the second control circuit 22 becomes H level, and therefore the lower blowing fan 3 rotates. (Figure 5e).

At this time, the heat exchanger temperature T. If the temperature exceeds the set value T1, the lower blowing fan 3 continues to rotate regardless of the room temperature TD.

Further, in the first comparison control circuit 21, the room temperature TD is set to the set value T2.
Since the following is the case, a signal for causing the compressors 5A and 5B to work together is outputted from the terminal 36.

Next, when the room temperature TD exceeds the set value T2, the outputs of the comparators 24 and 25 in the first comparison control circuit 21 become H level, and the flip-flop 32 is inverted, so that the output of the output terminal 36 becomes L level.

However, the output of the comparator 23 is held at the L level, the flip-flop 31 is not inverted, so the input to the AND gate 33 is at the H level, and the input from the flip-flop 32 is inverted to the H level, so the AND gate 33 is held at the H level. The logic of the gate 33 is established, so a low capacity signal of H level is output from the terminal 35, and only the compressor 5B is driven (FIG. 5b).

At this time, the output of the terminal 34 that provides a drive signal to the outdoor fan 9 is also at H level.

This outdoor fan 9 is rotated regardless of its capacity.

Next, after the room temperature TD enters a steady state, the room temperature TD fluctuates slightly, but this is controlled by the first comparison control circuit 21.

That is, referring to the time chart in Figure 6, room temperature control in steady state is ±1 (deg.
, is performed with 3 points equivalent to 1.

For example, time T in FIG. , the room temperature TD is the set value T
2, the output of the comparator 25 is at H level and the output of comparator 24 is at L level, so the output of output terminal 36 is at L level and the high capacity command signal is off, and conversely, the output of output terminal 35 is at L level. The low capability signal is on at H level.

Next, regarding time t1, the room temperature TD is the set value (T2
1) and the outputs of comparators 24 and 25 become L level.

Therefore, the high capability signal is turned on and the low capability signal is turned off.

Furthermore, when the temperature reaches such a point that TD reaches (T2+1) as at time t5, the comparators 23, 24 and 25
The outputs of both output terminals 35. and 35. are at H level.
No capacity signal is outputted from 36 either, and the compressor 5 ceases to operate.

In this way, when the heating load is large ((tzl) and T2
When the load is small [between T2 and (T-2-1)], control is performed by switching between high capacity and low capacity, and when the load is small [between T2 and (T-2-1)], control is performed by switching between low capacity and stop.

As is clear from the above explanation, according to the present invention, when the room temperature is lower than the comfortable temperature setting, the compressor is operated at high capacity and both the upper and lower blower fans are operated, so that the room temperature is lower than the comfortable temperature setting. When this value is exceeded, the top blower fan is operated at a low speed (in severe cases, it is stopped), so not only the compressor capacity but also the blower fan capacity can be changed in response to the heating load, and this allows the compressor to be turned on or off. The number of times required can be greatly reduced, and since the bottom blowing fan continues to operate even if the room temperature exceeds the comfortable temperature setting, temperature changes in the space below that affect the human body can be suppressed to a much lower level.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an indoor unit of a heater, Fig. 2 is a circuit diagram showing a heating cycle, Fig. 3 is a circuit diagram showing an embodiment of a control device according to the present invention, and Fig. 4 is an electronic control unit. FIG. 5a is an indoor temperature characteristic diagram, b, c, d, and e are operation time charts of the electronic control section, and FIG. 6 is an operation time chart of the first comparison control circuit. 1... Indoor unit, 2... Top blowing fan, 3... Bottom blowing fan, 4... Indoor heat exchanger, 5° 5A, 5B. ...Compressor, 10
... Indoor temperature sensor, 11 ... Heat exchanger temperature sensor, 12 ... Electronic control section, 21 ...
. . . 1st comparison control circuit, 22 . . . 2nd comparison control circuit.

Claims (1)

[Claims] 1. In a heat pump type heater that has independent blower fans at the upper and lower outlets and a compressor with variable heating capacity, an indoor temperature sensor that detects the indoor temperature;
Using the detection signal from this indoor temperature sensor as input, a signal is output to operate the compressor at high capacity when the room temperature is lower than the set value of the comfortable temperature, and a signal to operate both the upper and lower blow-off fans, so that the room temperature is comfortable. A heat pump type heater comprising: a comparison control circuit that outputs a signal to operate the compressor at a low capacity when the temperature is higher than a set value and a signal to rotate an upper blower fan at a lower speed than a lower blower fan. Control device.