JPS5981455A - Dehumidifying operating method for air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

In a known separate type air conditioner for heating and cooling, '7A1
As shown in the circuit diagram, the outdoor unit A and the indoor unit) B, l:C, and the outdoor unit l-A are
7. Four-way switching valve2. Outdoor heat exchanger 3° outdoor blower fan 4 (hereinafter referred to as outdoor fan), capillary tube 5.
Three-way solenoid valve6. Piping 21-23, 28, 29,
Indoor unit B is an indoor heat exchanger for reheating7. Indoor heat exchanger for cooling 12. Indoor ventilation fan 8 (hereinafter referred to as indoor fan), three-way solenoid valve 9. Check valve 11. Capillary tube 10. It consists of pipes 24 to 27, and the air flow passes through the cooling indoor heat exchanger I2 and the reheating indoor heat exchanger 7, as shown by the arrows in the cross-sectional view of FIG.

In addition, for cooling-only machines, four-way switching valve 2 and check valve 1
1 is not provided, and the piping 2I and the piping 22, and the piping 28 and the piping 29 are directly connected, respectively.

In such an air conditioner, first, during cooling operation, the high pressure gas refrigerant compressed by the compressor 1 is passed through the four-way switching valve 2, as shown by the solid arrow. The pipe 22 is passed through the outdoor heat exchanger 3, where the refrigerant exchanges heat with the outside air sent by the outdoor fan 4, radiates heat, is cooled and liquefied, and this high-pressure liquid refrigerant passes through the pipe 23, The capillary tube 5 is reached. During cooling, the three-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. It flows through the solenoid valve 9, the piping 26, and the indoor heat exchanger 12, but the indoor heat exchangers 7 and 12
When passing through, it converts heat with the indoor air sucked into the Schnitt B by the indoor ventilation fan 8, and is heated and vaporized to become a low-pressure gas refrigerant, while the guided heat exchangers 2 and 12 absorb heat. The cooled air is sent to Schnitt B by indoor fan 8.
Air is blown outside and cools the room. The refrigerant leaving the indoor heat exchanger 7 is checked by the check valve 1, and since the resistance of the capillary tube 10 is large, most of the refrigerant flows through the three-way solenoid valve 9.
The low-pressure gas refrigerant passes through the pipe 27, the four-way switching valve 2, and the pipe 29, and is sucked into the compressor 1 repeatedly.

Next, during heating operation, solenoid valves 6 and 9 are closed, so /
The solid medium flows as shown 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 (at this time, most of the refrigerant passes through the three-way solenoid valve 6 due to the resistance of the capillary tube 5)
→ Piping 24 → Indoor heat exchanger for reheating 7 → Piping 25 → Capillary tube 10 (At this time, the three-way solenoid valve 9 is closed and the check valve II is stopped in the opposite direction) → Piping 26
→ Cooling indoor heat exchanger I2 → Piping 27 → Piping 28 → Four-way switching valve 2 → Piping 29 → Compressor I.

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

(2) The high-pressure liquid refrigerant that exits the indoor heat exchanger 7 for reheating expands in the capillary tube 10, becomes a low-pressure liquid refrigerant, and reaches the indoor heat exchanger 12 for cooling. The indoor air sucked into the chamber is heated and vaporized into a low-pressure gas refrigerant, which is sucked into the compressor 1, while the cooling indoor heat exchanger 12
The indoor air that has passed through is cooled, and moisture in the air condenses on the surface of the heat exchanger 120 and is dehumidified.

(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 necessarily changing the indoor temperature.

(4) When the air outlet temperature is lower than the intake air temperature (indoor temperature), it is said to be cooling, and when it is higher, it is said to be heating, and this is controlled by the degree of heat radiation in the outdoor heat exchanger 3. That is, as shown in the third fastening diagram, when the rotation speed of the outdoor fan 4 is changed and the rotation is high (medium speed M rotation), the heat radiated by the outdoor heat exchanger 3 increases, and therefore the reheat indoor If the reheating effect in the heat exchanger 7 is weak, if the air conditioner is a little cool, if the rotation of the fan 4 is low (slow rotation), the heat dissipation in the outdoor heat exchanger 3 is low, and therefore the indoor heat exchange is Vessel 7
If the reheating effect is strong, it will feel like heating.

Note that in the above, the rotation speed M1 and the rotation speed are determined by the system. As an example of the dehumidifying operation described above, the status of the thermostat, compressor 1, outdoor fan 4, and changes in room temperature and room humidity are If the set temperature is higher than the room temperature (suction temperature) as shown in Fig. 4, the situation is as shown in Fig. 5.

In addition, conventional air conditioners were designed to be able to perform only one of two modes, for example, cooling-type dehumidification operation or heating-type dehumidification operation. If the dehumidifier is operated while the indoor temperature is relatively low (indoor temperature is relatively low), the occupants will feel chilly, and if the dehumidifier is operated with a slight heating effect, for example, in the late rainy season (indoor temperature is relatively high), the occupants will feel chilly. It has the disadvantage of feeling.

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 been sufficiently reduced and all that is left is to remove the intruding humidity, the compressor 1. The outdoor fan 4 also operates continuously, which is uneconomical (see Figures 4 and 5).

(2) Cooling and dehumidification to smooth room temperature changes,
To perform a slightly heating dehumidifying operation, the outdoor fan has to be rotated at much lower M and L rotations in addition to the normal cooling rotation (high-speed H rotation), and the fan motor is 3
Requires a gear position higher than 100%.

(3) Normally, the third speed (L rotation) is a very low rotation speed compared to the H rotation, and in order to secure that rotation speed, a large number of winding coils of the fan motor are required, but the temperature of the motor increases. As a countermeasure, the motor must be cooled to prevent infection. Alternatively, a resistor or the like is added to the motor power supply to reduce the current to slow the motor down, or a starting compensation circuit is normally provided when starting at L rotation, which requires 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. After the rise time has elapsed, the compressor is operated intermittently at a certain cycle, and the difference between the set temperature and the room temperature is detected at each cycle, and the stop time relative to the outdoor fan operating time is adjusted based on this difference. It is characterized by performing a slightly cooling dehumidifying operation in which the ratio is small, or a slightly heating dehumidifying operation in which the ratio of the stop time to the operating time of the outdoor fan is large.

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, and FIG. 7 is a flowchart of FIG. 6. 8 is a diagram showing the relationship between the outdoor fan rotation speed and temperature according to FIG. 6, and FIGS. 9 and 10 are graphs showing the relationship between the temperature of the room and the set temperature at the start of dehumidification operation using the method of the present invention, respectively. Temperature setting > Thermostat, compressor, outdoor fan start/stop, room humidity, room temperature, etc.
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 according to the signal, and a timer circuit 35 that counts the operation time TsD of warm air dehumidification.
, a timer circuit 36 that counts the operation stop time TF of the compressor according to a time-up signal from the timer circuit 34 or the timer circuit 35, an element 32 provided at the air outlet of the indoor unit that senses the air outlet temperature, and an element 32 that senses the air outlet temperature. A comparison circuit 37 that compares the temperature difference with the sensing element 31, an arithmetic circuit 38 that calculates a coefficient k based on the compared data,
Based on the signal, a timer circuit 39 counts the operating time T0 of the compressor 1, an operating time T0 of the outdoor fan 4,
T , T and T2RNIDN 2
Timer circuit 40 that counts DN IRN
．． Stop time of outdoor fan 4 T , T , T
Count IDF 2DF 2
It has a timer circuit 4I that performs RF, and according to the signals from each timer circuit, a relay opening/closing circuit 42 sends an opening/closing signal to a compressor relay 45, and an opening/closing signal is sent to a relay 46 for rotating the outdoor fan 4 at high speed H. It is composed of a relay opening/closing circuit 43 and a relay opening/closing circuit 44 which sends an opening/closing signal to a relay 47 for medium speed M' rotation of the outdoor fan 4.

In such an electronic control circuit unit, (1) In the case of set temperature ≦ suction temperature, first, the temperature set by the temperature setting unit 30 at the start of dehumidification operation and the temperature detected by the element 3I that senses the suction air temperature. is compared by the comparison circuit 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 for a preset 1111 hours.

On the other hand, the timer circuit 34 inputs a set signal to the relay switching circuit 42 and the relay switching circuit 43, and the compressor relay 45
Then, the relay circuit of the outdoor 7778 rotation relay 46 is closed, so the compressor 4 starts operating, and the outdoor fan 4 starts operating at H rotation to start the cooling operation or the cooling slightly dehumidifying operation. Note that while the timer circuit 34 is counting the 16FTsR time, it continues to output a set signal to the relay opening/closing circuit 42 and the relay opening/closing circuit 43.

When the 1 timer circuit 34 times up the TsR time count, a set signal (time up signal) is input from the timer circuit 34 to the timer circuit 36 to start counting the TF waiting time set in advance, and the timer circuit 36 reaches 12 When the time count starts, a reset signal is input from the timer circuit 36 to the relay opening/closing circuit 42 and the relay opening/closing circuit 43, and the compressor relay 45 and the outdoor 7778 rotation relay 46 are not open.
And the outdoor fan 4 stops operating.

Further, when the TF waiting time elapses and the timer circuit 36 times up, the time-up signal is transmitted to the timer circuit 36.
At the same time a set signal (time-up signal) is input from 6 to the timer circuit 39 and the timer circuit 40, the comparison circuit 37 compares the temperature difference between the suction temperature sensing element 31 and the outlet temperature sensing element 32, A coefficient k is determined in the arithmetic circuit 38 based on the 1-day signal from the comparator circuit 37, and this coefficient k is input to the timer circuit 40 and the timer circuit 41.

Then, the timer circuit 40 determines the operation time T of the outdoor fan 4.
, T , IDN 2DN·T, RN or T2RN, and the timer circuit 41 sets the stop time T , T IDF 2DF·TIRF or T2RF of the outdoor fan 4.

In this way, when the timer circuit 39 starts counting the preset 10 hours, a set signal is sent to the relay opening/closing circuit 42, the compressor relay 45 is closed, and the compressor I starts operating. Initially, the timer circuit 40 also outputs TIDN I T2DN' TIRN or T2
Count the operating time of the RN outdoor fan.

The relay opening/closing circuit 44 closes the outdoor fan M' rotation relay 47 according to the set signal of the timer circuit 4o.
The outdoor fan 4 starts operating at M' rotations, and eventually the timer circuit 40 times out.

When the timer circuit 41 is turned on, a set signal is input to the timer circuit 41 (TI of the outdoor fan stop time set in advance).
At the same time that the DF' T2DF I TIRF or T2RF time count starts, a reset signal is input to the relay opening/closing circuit 44, and as a result, the outdoor fan M' rotation relay 47 is not opened and the outdoor fan 4 is stopped.

Furthermore, time passes and the timer circuit 41 sets the outdoor fan stop time T , T , T or IDF.
When the time of 2DF IRFT2RF times up, a set signal is input again to the timer circuit 40, and the operation time of the outdoor fan T1DN, T2DN, TI is set.
Counting of RN or T2 RN is started, and the same operation as above is repeated until the timer circuit D39 times out 10 hours.

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 opening/closing circuit 42, the compressor relay 45 is opened, the compressor 1 is stopped, and at the same time, the timer circuit 40 is turned on. A reset signal is also input to the timer circuit 41, the timer count is stopped, and the relay opening/closing circuit 44 opens the outdoor fan M' rotation relay 47 to stop the outdoor fan 4.

Further, when the timer circuit D39 times out, a set signal is input to the timer circuit 36, the waiting time counter is started again, and the same operation as described above is repeated.

(2) In the case of set temperature > suction temperature As described above, at the start of dehumidification operation, the circuit compares the temperature set by the temperature setting unit 30 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 higher than the suction temperature by υ, a set signal is input to the timer circuit B35, and the timer circuit 35 starts counting the preset TsD time.

Is the timer circuit 35 the relay opening/closing circuit 4? A set signal is input to the compressor relay 45 to close it, and on the other hand, the timer circuit 35 inputs a reset signal to the relay opening/closing circuit 43, so the outdoor fan H rotation relay 43 remains open.
In this way, the compressor I is operated, while the outdoor unit 714 remains stopped, and dehumidification during warm weather is performed.

Note that while the timer circuit 35 is counting the TsD time, a set signal is supplied to the relay opening/closing circuit 42, and a set signal is supplied to the relay opening/closing circuit 42.
3, a reset signal will be issued successively.

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

Due to the action of the electronic control circuit section described above, (1) When starting operation from set temperature (target room temperature) ≦ room temperature (suction temperature) (1) First, as shown in Fig. 9 and Fig. 7. In this way, the air conditioner is operated continuously for the TSR period to thoroughly remove the humidity in the room. Here, the TsR time is determined based on weather statistics, market housing conditions, systems, etc., and is stored in a microcomputer, etc., and may be unchanged, but may 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 thermo-off can be used as in the conventional case.In this embodiment, cooling operation is shown, but when the outdoor fan 4 is T51 hours M'
The rotation may be continued to provide extremely strong cooling and dehumidification.

(2) After the start-up time T8R in (1) has passed, the humidity in the room usually does not change significantly, so the compressor repeats the cycle of T, time stop, and 10-hour operation.

Here, TF * Tg is determined by analyzing the usage status of the air conditioner, the hardware system (equipment), etc., and is stored in the electronic control circuit such as a microcomputer. (3) When the compressor is stopped, the outdoor fan 4 is also Stop.

(4) When the compressor is operating, the set temperature is checked for the difference (coefficient k) between the temperatures in one room (suction temperature), and the selection of cooling or heating and its strength are controlled electronically using a microcomputer, etc. The decision is made in the circuit section, and the decision is made by the ship. The outdoor fan 4 starts and stops during the time.

(5) The cooling operation or heating operation power is determined by the length of operation time of the outdoor fan 4. As shown in FIG. 8, if the operation time of the outdoor fan 4 is long, the outdoor heat exchanger 3
If the length is too short, there will be less heat radiated, resulting in a feeling of heating.

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 the time) of the outdoor fan 4, and this implementation In the example, the strength is set to 2, one is slightly weak and the other is slightly strong.
However, by increasing the number of types of discriminant coefficients,
Control may be performed in multiple stages. This also applies to the slightly heating dehumidifying operation.

In the above embodiment, the outdoor fan 4 is operated and stopped twice in 10 hours, but if the number of times the operation is stopped is set to be larger, the change in the blowing temperature can be reduced accordingly.

Here, the operating rate and number of times the fan 4 is stopped within 10 hours must be determined by the system.

(11) Set temperature> When starting operation from the room temperature (suction temperature) (1) As shown in Figures 10 and 7, stop the outdoor fan 4 and perform very strong warm dehumidification operation. 18
Do this continuously for 0 hours, raising the temperature of the room and removing 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 in item (1) above has passed, the compressor repeats T, time stop, and 70-hour operation, as in (1) to (5) in (I) above. In return, an operation check is performed at the beginning of each To, and the outdoor fan 4 is stopped for 10 hours according to the coefficient k, and the control for cooling or heating is applied. One hour of TFr is from (1) of (1) above.
This may be changed from case (5).

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

(1) The compressor and outdoor fan will be operated intermittently in a place with little humidity change other than during start-up and during the start of operation.
Economical dehumidification operation becomes possible by the amount of power consumed during the stop time.

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

(3) By changing the operating rate and the number of times the outdoor fan is stopped, it is possible to finely set cooling, heating, temperature changes, etc., and a good feeling can be obtained.

In short, according to the present invention, after a predetermined start-up time has elapsed from the start of dehumidification operation, the compressor is operated intermittently at a certain period, and the difference between the set temperature and the room temperature is detected at each period. According to this difference, a good feeling can be achieved by performing a slightly cooling dehumidifying operation in which the ratio of the stop time to the outdoor fan's operating time is small, or a slightly heating dehumidifying operation in which the ratio of the stopping time to the outdoor fan's operating time is large. The present invention is extremely useful industrially because it provides an economical method for dehumidifying an air conditioner.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a known separate air conditioner, Fig. 2 is a sectional view of the indoor unit shown in Fig. 1, and Fig. 3 shows the relationship between the outdoor fan rotation speed and temperature in Fig. 1. The diagrams, Figures 4 and 5 show the starting and stopping of the thermostat, compressor, and outdoor fan when the set temperature is less than the room temperature and when the set temperature is greater than the room temperature at the start of dehumidification operation in Figure 1, respectively. A diagram showing changes in room humidity and 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 No. 70 is a flowchart of FIG. 6. Figure 8 is a diagram showing the relationship between outdoor fan rotation speed and temperature according to @Figure 6, and Figures 9 and 10 are respectively when the room temperature is lower than the set temperature at the start of dehumidification operation by the method of the present invention. FIG. 3 is a diagram showing changes in the thermostat, the compressor, the outdoor fan, the humidity in the room, and the temperature in the room when the set temperature is greater than the room temperature. 1...Compressor, 2...Four-way valve, 3...Outdoor heat exchanger, 4...Outdoor fan, 5...Capillary tube, 6...Three-way solenoid valve, 7...Re Indoor heat exchanger for heat,
8... Indoor fan, 9... Three-way solenoid valve, 10...
Cabillary Cheap, 11...inverted f]", 12...
Indoor heat exchanger for cooling, 30...Temperature setting section, 31.3
2...Temperature sensing element, 33...Comparison circuit, 34,3
5゜36...Timer circuit, 37...Comparison circuit, 3
8... Arithmetic circuit, s9.4o, 41... Timer circuit, 42.43.44... Relay opening/closing circuit, I5...
・Compressor A IJ relay 45a...Contact, 46...
Relay for outdoor fan, 46a... contact, 47... relay for outdoor fan M' rotation, 47a... contact.

Claims (1)

[Claims] Dehumidification 2/R start. 111I After 9 hours have elapsed from the specified start-up, the compressor will be operated intermittently at a certain period, and at each period, the difference between the set temperature and the room temperature will be detected, and this difference will be detected. A dehumidifying operation method for an air conditioner, which is characterized by performing a slightly cooling dehumidifying operation in which the ratio of the stop time to the operating time of the outdoor fan is small, or a slightly heating dehumidifying operation in which the ratio of the stopping time to the outdoor fan's operating time is large, depending on the operation time of the outdoor fan. .