JPH0361095B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a dehumidifying operation method for an air conditioner.

In the known separate heating and cooling air conditioner,
As shown in the circuit diagram in Figure 1, it consists of an outdoor unit A and an indoor unit B, and the outdoor unit A is
Compressor 1, four-way switching valve 2, outdoor exchanger 3, outdoor blower fan 4 (hereinafter referred to as outdoor fan), capillary tube 6, two-way solenoid valve 6, piping 21 to 23,
28, 29, the indoor unit B includes an indoor heat exchanger 7 for reheating, an indoor heat exchanger 12 for cooling, an indoor ventilation fan 8 (hereinafter referred to as indoor fan), a two-way solenoid valve 9, a check valve 11, Capillary tube 10,
It consists of pipes 24 to 27, and air flows through the indoor heat exchanger 12 for cooling and the indoor heat exchanger 7 for reheating, as shown by the arrows in the cross-sectional view of FIG.

In addition, in the case of a cooling-only machine, the four-way valve 2 and the check valve 11 are not provided, and the pipes 21, 22, and 28 are not provided.
and piping 29 are directly connected to each other.

In such an air conditioner, during cooling operation, the high-pressure gas refrigerant compressed by the compressor 1 passes through the four-way switching valve 2 and piping 22 and enters the outdoor heat exchanger 3, as shown by the solid arrow. Here, the high-pressure liquid refrigerant exchanges heat with the outside air sent by the outdoor blower fan 4 and radiates heat, is cooled and liquefied, and this high-pressure liquid refrigerant passes through the pipe 23 and reaches the capillary tube 5 . During cooling, the two-way solenoid valve 6 is closed, so the refrigerant passes through the capillary tube 5, where it expands and becomes a low-pressure liquid refrigerant.
4, indoor heat exchanger 7, piping 25, two-way solenoid valve 9,
It flows through the pipe 26 and the indoor heat exchanger 12, but when passing through the indoor heat exchangers 7 and 12, it exchanges heat with the indoor air drawn into the unit B by the indoor blower fan 8, and is heated and vaporized. The air, which becomes a low-pressure gas refrigerant and which has absorbed heat and been cooled by the indoor heat exchangers 7 and 12, is blown out of the unit B by the indoor fan 8 to cool the room. Indoor heat exchanger 7
The refrigerant that exits is checked by the check valve 11, and
Since the resistance of the capillary tube 10 is large, most of the refrigerant passes through the two-way solenoid valve 9, and the low-pressure gas refrigerant flows through the pipe 2.
7. The cycle of passing through the four-way switching valve 2 and piping 29 and being sucked into the compressor 1 is repeated.

Next, during heating operation, the solenoid valves 6 and 9 are closed, so the refrigerant flows as indicated by the chain arrow.

Furthermore, during dehumidification operation, the solenoid valve 6 is opened, the solenoid valve 9 is closed, and the refrigerant is transferred from piping 21 → four-way switching valve 2 → piping 22 → outdoor heat exchanger 3 → piping 23 as shown by the dashed-dotted line arrow. → Two-way solenoid valve 6 (open at this time, due to the resistance of the capillary tube 5,
Most of the refrigerant passes through the two-way solenoid valve 6) → Piping 24
→ Indoor heat exchanger for reheating 7 → Piping 25 → Capillary tube 10 (At this time, the two-way solenoid valve 9 is closed and the check valve 11 is stopped in the reverse direction) →
Piping 26 → Cooling indoor heat exchanger 12 → Piping 27 →
Piping 28 → four-way switching valve 2 → piping 29 → compressor 1.

(1) During normal cooling operation, the outdoor fan 4 is rotated at high speed (H rotation) to allow the outdoor heat exchanger to radiate sufficient heat, but during dehumidification operation, the rotation of the outdoor fan 4 is slowed down ( (medium speed M or low speed L rotation), the outdoor heat exchanger 3 performs heat dissipation, and a part of it is also performed by the reheating indoor heat exchanger 7.

(2) The high-pressure liquid refrigerant leaving the indoor heat exchanger 7 for reheating is
It expands in the capillary tube 10, becomes a low-pressure liquid refrigerant, and reaches the cooling indoor heat exchanger 12, where it is heated by the indoor air sucked into the unit.
The indoor air is vaporized and turned into a low-pressure gas refrigerant and sucked into the compressor 1. Meanwhile, the indoor air that has passed through the cooling indoor heat exchanger 12 is cooled, and moisture in the air condenses on the surface of the heat exchanger 12 and is dehumidified. be done.

(3) As shown in Figure 2, the cooled and dehumidified air is heated (reheated) when passing through the indoor heat exchanger 7 for reheating (see (1)), and is brought to a temperature close to the indoor temperature. The air is blown out from the unit, and the above action removes humidity without significantly changing the indoor temperature.

(4) When the blowout temperature is lower than the intake air temperature (indoor temperature), it is called cooling, and when it is higher, it is called heating, and this is controlled by the degree of heat radiation in the outdoor heat exchanger 3. That is, the third
As shown in the diagram, when the rotation speed of the outdoor fan 4 is changed and the rotation is high (medium speed M rotation), the heat radiation in the outdoor heat exchanger 3 increases, and therefore the indoor heat exchanger for reheating When the reheating effect in the outdoor heat exchanger 3 becomes weak and the air conditioner becomes a little cooler, and the rotation of the fan 4 is low (low speed L rotation), the heat dissipation in the outdoor heat exchanger 3 decreases, and therefore the reheating effect in the indoor heat exchanger 7 decreases. becomes stronger and feels like heating.

Note that in the above, the rotation speed M and the rotation speed L are determined by the system. As an example of the above dehumidifying operation, the status of the thermostat, compressor 1, outdoor fan 4 on/off status, room temperature, and room humidity change status is determined at the start of operation as set temperature ≤ room temperature (suction temperature)
In the case of , the result is as shown in FIG. 4, and in the case of set temperature>room temperature (suction temperature), the result is as shown in FIG. 5.

Furthermore, conventional air conditioners have been designed to be capable of performing either one of a cooling dehumidifying operation and a heating dehumidifying operation, for example. However, if the dehumidifying operation is carried out with a slight cooling effect, for example, in the early rainy season (indoor temperature is relatively low), residents will feel chilly, and if the dehumidifying operation is carried out with a slight heating effect, for example, in the late rainy season (indoor temperature is relatively low), residents will feel chilly. The disadvantage is that residents feel hot even though the temperature is relatively high.

Furthermore, the conventional air conditioner has the following drawbacks during dehumidification operation.

(1) After the start of operation, even though the humidity in the room has dropped sufficiently and it is only necessary to remove the intruding humidity, both compressor 1 and outdoor fan 4 operate continuously, which is uneconomical (No. (See Figures 4 and 5).

(2) In order to smooth room temperature changes, we perform dehumidification with a slight cooling effect and dehumidification with a slight heating effect, but for this purpose, the rotation of the outdoor fan is changed from the normal cooling rotation (high-speed H rotation) to lower M and L rotations. Therefore, the fan motor requires three or more gears.

(3) Normally, the third speed (L rotation) rotates much lower than the H rotation, and in order to maintain that rotation speed, a large number of winding coils are required for the fan motor, but as a countermeasure against the temperature rise of the motor, The motor must be cooled and protected. Alternatively, a resistor or the like is added to the motor power supply to reduce the current and deceleration, or a normal starting compensation rotation is provided when starting at L rotation, which all require a large amount of cost and space for the system. .

The present invention was proposed in view of the above circumstances, and aims to provide an economical dehumidifying operation method for an air conditioner that does not impair the feeling of residents. The difference between the intake air temperature and the intake air temperature is detected, and depending on this difference, the air conditioner is operated for a predetermined period of time in a cooling dehumidifying operation or a heating dehumidifying operation. The outdoor fan is stopped when the compressor is stopped, and controlled intermittently when the compressor is running, in accordance with the intermittent operation of the compressor. The difference between the air temperature and the blowing air temperature is detected, and depending on this difference, either cooling-like dehumidification operation is performed, where the ratio of the outdoor fan's stop time to the operating time is small, or heating, where the ratio of the outdoor fan's stop time to the operating time is large. The present invention is characterized in that a slight dehumidifying operation is selected and the ratio of the stop time to the operation time of the outdoor fan is changed.

An embodiment of the present invention will be explained with reference to the drawings.
FIG. 6 is a block diagram showing an electronic control circuit section of an embodiment used to carry out the method of the present invention;
Figure 7 is a diagram showing the flowchart of Figure 6;
The figure shows the relationship between outdoor fan rotation speed and temperature according to Fig. 6, and Figs. 9 and 10 show the case where the temperature is set at the start of dehumidification operation and when the temperature in the room is higher than the set temperature, respectively, using the method of the present invention. Thermostat, compressor, outdoor fan start/stop, room humidity,
FIG. 3 is a diagram showing changes in room temperature.

The electronic control circuit section is configured as shown in FIG. 6, and includes a comparison circuit 33 that compares a temperature setting section 30 that sets a desired room temperature with an element 31 that senses the room temperature (suction temperature). , a timer circuit 34 that counts the operation time _TSR of cooling operation or cool dehumidification based on the signal, and the operation time of warm dehumidification.
A timer circuit 35 that counts _TSD , a timer circuit 36 that counts the compressor operation stop time _TF based on the time-up signal of the timer circuit 34 or the timer circuit 35, and an element that is installed at the air outlet of the indoor unit and senses the air outlet temperature. 32 and the element 31 that senses the suction temperature, an arithmetic circuit 38 that calculates the coefficient k based on the compared data, and a time-up signal from the timer circuit 36 to control the compressor 1. operating time
A timer circuit 39 counts T ₀ , a timer circuit 40 counts operating times T _1DN , T _2DN , T _1RN and T _2RN of the outdoor fan 4, and a timer circuit 40 counts the stop times T _1DF , T _2DF , T _2RF of the outdoor fan 4 A relay opening/closing circuit 42 which has a timer circuit 41 and sends an opening/closing signal to a compressor relay 45 based on signals from each timer circuit, and a relay opening/closing circuit 43 which sends an opening/closing signal to a relay 46 for rotating the outdoor fan 4 at high speed H. , Relay 4 for medium speed M' rotation of outdoor fan 4
7 and a relay opening/closing circuit 44 that outputs opening/closing signals.

In such an electronic control circuit, (1) When set temperature ≦ suction temperature First, the circuit compares the temperature set by the temperature setting unit 30 at the start of dehumidification operation and the temperature detected by the element 31 that senses the suction air temperature. 33, and when it is determined that the set temperature is lower than the suction temperature, a set signal is input to the timer circuit 34, and the timer circuit 34 starts counting a preset _TSR time.

On the other hand, the timer circuit 34 is connected to the relay opening/closing circuit 42.
and input a set signal to the relay opening/closing circuit 43,
Since the relay circuits of the compressor relay 45 and the outdoor fan H rotation relay 46 are closed, the compressor 4 starts operation, and the outdoor fan 4 is operated at H rotation to perform cooling operation or cooling slightly dehumidifying operation. start. Note that while the timer circuit 34 is counting the _TSR time, it continues to output a set signal to the relay switching circuit 42 and the relay switching circuit 3.

○*Next, when the timer circuit 34 times up the count of the _TSR time, the timer circuit 34
is preset in the timer circuit 36 from
A set signal (time-up signal) to start counting the T _F time is input, and the timer circuit 3
6 starts counting the T _F time, a reset signal is input from the timer circuit 36 to the relay opening/closing circuit 42 and relay opening/closing circuit 43, and the compressor relay 45 and outdoor fan H rotation relay 4
6 is opened, and the compressor 1 and outdoor fan 4 stop operating.

Furthermore, the T _F time has elapsed and the timer circuit 3
6 times up, the time-up signal enters the set signal (time-up signal) from the timer circuit 36 to the timer circuit 39 and the timer circuit 40, and at the same time, the element 31 that senses the suction temperature and the element 32 that senses the outlet temperature The comparison circuit 37 compares the temperature difference, and the comparison circuit 3
Based on the data from 7, the arithmetic circuit 8 calculates the coefficient k.
is calculated, and this coefficient k is input to the timer circuit 40 and the timer circuit 41.

Then, the timer circuit 40 sets the operating time T _1DN , T _2DN , T _1RN or T _2RN of the outdoor fan 4, and the timer circuit 41 sets the operating time of the outdoor fan 4.
Set the stop time T _1DF , T _2DF , T _1RF or T _2RF .

In this way, when the timer circuit 39 starts counting the preset time _T0 , a set signal is sent to the relay opening/closing circuit 42, the compressor relay 45 is closed, and the compressor 1 starts operating. , and the timer circuit 40 is
Count the operation time of the outdoor fan T _1DN , T _2DN , T _1RN or T _2RN .

The relay opening/closing circuit 44 operates the outdoor fan M' rotation relay 4 by the set signal of the timer circuit 40.
7 is closed, the outdoor fan 4 starts operating at M' rotation, and when the timer circuit 40 times up, a set signal is input to the timer circuit 41, and the outdoor fan stop time T _1DF , which has been set in advance, is reached. At the same time as counting of T _2DF , T _1RF or T _2RF time is started, a reset signal is input to the relay switching circuit 44, and as a result, the outdoor fan M' rotation relay 47 is opened and the outdoor fan 4 is stopped.

Furthermore, time passes and the timer circuit 41 determines the outdoor fan stop time T _1DF , T _2DF , T _1RF or T _2RF
When the time is up, timer circuit 4
0 again, starts counting the operating time T _1DN , T _2DN , T _1RN or T _2RN of the outdoor fan, and performs the same operation as above with the timer circuit D3.
Repeat until 9 times out T ₀ time.

When the timer circuit 39 times up, a set signal is input to the timer circuit 36, a reset signal is input to the relay switching circuit 42, the compressor relay 45 is opened, the compressor 1 is stopped, and at the same time, the timer circuit 40 and the timer circuit 4
1 also receives a reset signal, the timer count stops, and the relay opening/closing circuit 44 is connected to the outdoor fan.
The M' rotation relay 47 is opened to stop the outdoor fan 4.

Furthermore, when the timer circuit D39 times out, a set signal is input to the timer circuit 36.
Start the _TF time counter again and repeat the same operation as above.

(2) When set temperature > suction temperature Similarly to the above, at the start of dehumidification operation, the comparison circuit 33 compares the temperature set by the temperature setting section 30 and the temperature detected by the element 31 that senses the suction air temperature. , when it is determined that the set temperature is higher than the suction temperature, the timer circuit B35
A set signal is input to the timer circuit 35, and the timer circuit 35 starts counting the preset _TSD time.

The timer circuit 35 inputs a set signal to the relay switching circuit 42 to close the compressor relay 45, while the timer circuit 35 inputs a set signal to the relay switching circuit 42 to close the compressor relay 45.
Since the reset signal is input to 3, the outdoor fan H
The rotation relay 43 remains open, and thus the compressor 1 operates, the outdoor fan 4 remains stopped, and warm-up dehumidification is performed.

Note that while the timer circuit 35 is counting the _TSD time, a set signal is sent to the relay opening/closing circuit 42.
Reset signals are subsequently issued to the relay opening/closing circuits 43, respectively.

The subsequent operations are the same as those after the ○* mark in (1) above.

Due to the action of the electronic control circuit described above, () When starting operation from set temperature (target room temperature) ≦ room temperature (suction temperature) (1) First, as shown in Figs. 9 and 7,
The air conditioner is operated continuously for T _SR time to greatly remove the humidity in the room. Here, T _SR time depends on weather statistics, market house conditions, system, etc.
The temperature is determined and stored in a microcomputer, etc., and may be unchanged, but may also be variable depending on the difference between the set temperature and the suction temperature, for example.
Alternatively, as shown in FIG. 4, the time from the start of operation until the first thermostat is turned off may be used as in the conventional case.In this embodiment, cooling operation is shown, but the outdoor fan 4 is operated for T _SR time. It is also possible to perform extremely strong cooling and dehumidification by continuously rotating M′.

(2) After the rise time _TSR in (1) above has passed,
Normally, the humidity in the room does not change significantly, so
The compressor repeats a cycle of stopping for T _F time and running for T ₀ time.

Here, both T _F and T ₀ are determined by analyzing the usage status of the air conditioner, the hardware system (equipment), etc., and stored in the electronic control circuit such as a microcomputer. (3) When the compressor is stopped, the outdoor fan 4 also stops.

(4) When the compressor is operating, it checks the difference (coefficient k) between the blowout temperature and the temperature (suction temperature) in one room, and selects cooling or heating and its strength using an electronic control circuit such as a microcomputer. The outdoor fan 4 is started and stopped during T ₀ time according to the coefficient of determination.

(5) Whether it is a cooling operation or a heating operation is determined by the length of time the outdoor fan 4 is operated. As shown in FIG. 8, when the outdoor fan 4 is operated for a long time, the outdoor heat exchanger 3 releases a lot of heat, resulting in a feeling of cooling, and when the operating time is short, the heat is released little, resulting in a feeling of heating.

In addition, even if the cooling is the same, the intensity can be changed by changing the ratio of the operating time of the outdoor fan 4 to the operating rate (relative to T ₀ hours) of the outdoor fan 4, and this embodiment So let's set the strength to 2: slightly weaker and slightly stronger.
Although stages are employed, the control may be performed in multiple stages by increasing the number of types of discrimination coefficients k. This also applies to the slightly heating dehumidifying operation.

In the above embodiment, the outdoor fan 4 is operated and stopped twice during the T ₀ time, but if the number of times the operation is stopped is set to be larger, the change in the degree of blowing can be reduced accordingly.

Here, the operating rate and number of stops of the fan 4 within the T ₀ time must be determined by the system.

() When starting operation from set temperature > room temperature (suction temperature) (1) First, as shown in Figures 10 and 7, stop the outdoor fan 4 and perform very strong warm dehumidification operation. Do this continuously for T _SD hours to raise the temperature of the room and at the same time remove much of the humidity. The _TSD time may be constant or variable, and may be set until the first thermostat is turned off.

(2) After the start-up time described in (1) above, the compressor repeats the operation of stopping for T _F time and running for T ₀ time, as in (1) to (5) of () above, and An operation check is performed at the beginning of T ₀ , and during T ₀ the outdoor fan 4 is stopped in accordance with the coefficient k to control whether it is slightly cooling or heating. The T _F and T ₀ times may be changed from those in (1) to (5) above.

According to such a dehumidifying operation method for an air conditioner, the following effects can be achieved.

(1) Since the compressor and outdoor fan are operated intermittently in a place where there is little humidity change other than at the time of start-up and start of operation, economical dehumidification operation is possible by the amount of power consumed during the stop time.

(2) A motor with fewer rotational speed stages can be used as the outdoor fan motor, eliminating the need for deceleration means, start-up compensation circuits, etc., thereby reducing the cost and space of the outdoor unit.

(3) By changing the operating rate and number of stops of the outdoor fan, it is possible to finely set the cooling, heating, and air outlet temperature changes, and to obtain a good feeling.

In short, according to the present invention, at the start of dehumidification operation,
The difference between the set temperature and the intake air temperature is detected, and depending on this difference, the air conditioner is operated for a predetermined period of time in a cooling-like dehumidifying operation or a heating-like dehumidifying operation. The compressor is controlled intermittently in cycles, and in accordance with the intermittent operation of the compressor, the outdoor fan is stopped when the compressor is stopped, and controlled intermittently while the compressor is running, and the compressor is operated in this constant cycle. At this time, the difference between the intake air temperature and the outlet air temperature is detected, and depending on this difference, either a cooling dehumidifying operation with a small ratio of the stop time to the outdoor fan operating time or a cooling dehumidification operation with a small ratio of the stop time to the outdoor fan operating time is selected. By selecting a dehumidifying operation with a large amount of heating and changing the ratio of the outdoor fan's stop time to the operating time, an economical air conditioner dehumidifying operation method with good feeling can be obtained.
The present invention is extremely useful industrially.

[Brief explanation of drawings]

Figure 1 is a system diagram of a known separate air conditioner, Figure 2 is a sectional view of the indoor unit in Figure 1, and Figure 3 is a diagram showing the relationship between the outdoor fan rotation speed and temperature in Figure 1. , Figures 4 and 5 are the first
In the figure, there is a diagram showing the start/stop of the thermostat, compressor, outdoor fan, room humidity, and changes in room temperature when the set temperature is the room temperature at the start of dehumidification operation, and when the set temperature > the room temperature. FIG. 6 is a block diagram showing an electronic control circuit section of an embodiment used to carry out the method of the present invention, and FIG.
8 is a diagram showing the relationship between outdoor fan rotation speed and temperature according to FIG. 6,
FIGS. 9 and 10 show the thermostat when the set temperature is the room temperature at the start of dehumidification operation and when the set temperature > the room temperature, respectively, according to the method of the present invention.
FIG. 3 is a diagram showing changes in the compressor, the start/stop of the outdoor fan, the humidity in the room, and the temperature in the room. 1...Compressor, 2...Four-way valve, 3...Outdoor heat exchanger, 4...Outdoor fan, 5...Capillary tube, 6...Two-way solenoid valve, 7...Indoor heat exchanger for reheating device, 8...indoor fan, 9...two-way solenoid valve, 1
0... Capillary tube, 11... Check valve, 1
2... Indoor heat exchanger for cooling, 30... Temperature setting section, 31, 32... Temperature sensing element, 33... Comparison circuit, 34, 35, 36... Timer circuit, 37
... Comparison circuit, 38 ... Arithmetic circuit, 39, 40,
41... Timer circuit, 42, 43, 44... Relay opening/closing circuit, 45... Compressor relay, 45a
...Contact, 46...Relay for outdoor fan, 46a
...Contact, 47...Outdoor fan M' rotation relay,
47a...Contact.

Claims (1)

[Claims] 1. At the start of dehumidification operation, the difference between the set temperature and the intake air temperature is detected, and depending on this difference, the air conditioner is operated for a predetermined period of time in a cooling dehumidification operation or a heating dehumidification operation, and when the above predetermined period of time has elapsed. After that, the compressor is controlled to operate intermittently at a certain period, and in accordance with the intermittent operation of the compressor, the outdoor fan is stopped when the compressor is stopped, and controlled intermittently when the compressor is running. When operating the compressor, the difference between the intake air temperature and the outlet air temperature is detected, and depending on this difference, either a cooling dehumidifying operation with a small ratio of the stop time to the outdoor fan operating time or an outdoor fan operation is performed. A dehumidifying operation method for an air conditioner, characterized in that a heating dehumidifying operation with a large ratio of stop time to time is selected, and the ratio of stop time to operating time of an outdoor fan is changed.