JPS59185928A - Controlling device of air conditioner - Google Patents

Abstract

PURPOSE:To provide the control device of an air conditioner, which enables to perform the control with high degree of comfort in relation to the height of humidity in a room together with the prevention of recirculation of humidity during the standstill of a compressor. CONSTITUTION:A first controller 24, which controls a compressor 3 in response to the temperature detected by a temperature sensor 16 and at the same time has a counter 32 counting the downtime of the compressor 3 in order to forcibly start the running of the compressor within a predetermined period of time, and a second controller 25, which forcibly changes-over an indoor blower 7 to weak wind level running during the standstill of the compressor in response to the humidity detected by a humidity sensor 27, are provided. As a result, the return of humidity from an air conditioner to a conditioned space during the standstill of the compressor is prevented in the high humidity area, in which the humidity is the major factor of sense of discomfort, and yet the rise of effective temperature is prevented by decreasing the air flow rate during the standstill of the compressor in the low humidity area, in which the temperature is the major factor of sense of discomfort. Accordingly, the conditioned space can be controlled to the temperature and humidity conditions ideal with respect to bodily sensation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an air conditioner that controls the temperature and humidity of an air-conditioned space by starting and stopping a cold source and controlling the amount of air blown.

Conventional configuration and its problems In general, air conditioners turn on the compressor according to the temperature set by a temperature sensor that detects the room temperature.
He is taking care of his side. In this case, the compressor is turned on according to the set temperature.
It is a well-known fact that a predetermined differential (temperature difference) is established between the temperature at the time of operation and the temperature at the time of OFF to prevent frequent ON-OFF switching.

However, due to the presence of this differential, depending on the load situation, the compressor may not restart from stopping (OFF).
(1) For example, when the air conditioner is in a cooling operation, the humidity is increased by circulating the dehumidified air in the evaporator into the air-conditioned room again using the blower during the interruption period.

It caused discomfort.

A control method shown in the time charts of FIGS. 4 and 5 is known as a technique for preventing the shortcomings. In other words, Fig. 4 shows that the compressor is turned on and off according to the differential for indoor temperature control, but there is a certain period of time T when the compressor is stopped.
, when reached, it is forced.

This is to start the compressor, thereby preventing the humidity that has been dehumidified from returning to the air-conditioned space due to the compressor being stopped for a long time. however,
If the blower is set to generate strong airflow, the humidity will quickly return to the air-conditioned space, creating an uncomfortable humid condition in times of high humidity where high humidity is a major factor in discomfort. Furthermore, in the control shown in FIG. 5, even if the blower is set to produce strong airflow in order to prevent humidity from circulating indoors, when the compressor is stopped, the blower is turned to weak airflow. This method reduces the rate at which the dehumidified humidity returns to the air-conditioned space, but if the compressor remains stopped for a long time, the moisture returns to the air-conditioned space and the high temperature can cause discomfort. When the humidity is low, which is a factor, the weak air flow causes the perceived temperature to rise, making it uncomfortable.

Purpose of the Invention The present invention does not merely prevent the recirculation of humidity when the compressor is stopped, but also provides a control device for an air conditioner that can perform highly pleasant control in relation to the level of indoor humidity. 7. Structure of the Invention To achieve this object, the present invention includes a temperature sensor that detects indoor temperature, a humidity sensor that detects indoor humidity, and a compressor that detects the temperature detected by the temperature sensor. a first controller having a counter for controlling the compressor and forcibly starting operation of the compressor within a predetermined time; By having a second controller that forcibly switches to low wind operation when the compressor is stopped, the compressor is forcibly started when the compressor stop time reaches a certain value, and when the humidity in the room is low. When the value exceeds a certain value, the air is forcibly blown to a weaker level to prevent humidity from being recirculated and to improve the sense of comfort depending on the humidity situation.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a refrigeration system diagram of an air conditioner according to an embodiment of the present invention. 1 is an indoor unit, and 2 is an outdoor unit. 3 is a compressor, 4 is an outdoor coil, 6 is a pressure reducer, and 6 is an indoor coil, which are connected in a ring to form a refrigeration cycle. Reference numeral 7 denotes an indoor blower that circulates air in the air-conditioned space and exchanges heat with the indoor coil.

8 is an outdoor blower for exchanging heat between outside air and the outdoor filter. FIG. 2 shows a circuit block diagram in an embodiment of the present invention. 9 is a three-phase 200V power supply, and the first relay 10
is connected to the compressor 3 via the first relay 1.
0, it is possible to control starting and stopping of the compressor 3.

Further, any two of the three power lines are connected to the second relay ~11, and the strong wind tap A2 and the weak wind tap B of the indoor blower 7 are connected to this relay 11.

A common tap C is connected to each. The second relay 11 can select whether to energize the strong wind tap a or the weak wind tap b, and can switch the operation of the indoor fan 7 between strong wind and weak wind. can. Further, the second relay 11 can open and close the common tap C, and can control starting and stopping of the indoor blower 7.

Reference numeral 12 denotes an operation switch which is input to the second relay 11 to open and close the common tap C, and also puts into operation an electronic circuit as a first controller 24, which will be described below.

13 is strong wind due to user.

A manual air volume changeover switch for weak air is input to the second relay 11 to switch between the strong air tap a and the weak air tap C. Reference numeral 14 denotes a first comparator, which starts operating when the operation switch 12 is turned on, and compares the output voltage value of the temperature setting volume 15, which can be operated manually by the user, and the temperature of the air-conditioned space with respect to the change in resistance value. The output voltage value of the temperature sensor 16 to be detected is inputted, and the first temperature sensor 16
The rHJ level is output only when the detected temperature is higher than the temperature set by the temperature setting volume 15. 17 is a differential circuit that determines the differential of the comparator 14.

The output of the comparator 14 is input to the first relay 1o via the buffer 18, and controls whether the compressor 3 is turned on or off. A current transformer 19 generates an induced voltage only when the compressor 3 is in operation and energized.7 The output of the current transformer 19 is input to a converter 2o and converted into a digital quantity. That is, only when the compressor 3 is operating, the output of the converter 20 is at the 1-Hj level. The output of the converter 20 is an impark 21 which inverts the input and outputs it.
is input to the reset manual force d of the counter 22. The oscillator 23 oscillates only when the output of the inverter 21 is rHJ. The output of the oscillator 23 is input to the counter 22, and when the counter 22 counts the oscillation frequency of the oscillator 23 and reaches a count corresponding to 1, for example, 7 minutes, the output of the oscillator 23 is input to the differential circuit 17. 'H level output. When the input power r L j level of the differential circuit 17Id, the differential can be set to, for example, 2.0'C, and when the input is rHJ level, the differential can be set to, for example, 0.5°C. 1 The output of comparator 4 is f[
While the compressor 3 is operating at the J level, the output of the converter 20 is at the rHJ level and is input to the reset human power d of the counter 22, so the counter 22 is always reset. "L" level is output to the differential circuit 17 - Therefore, the differential of the differential circuit 17 is 2.0'
Set to C.

On the other hand, when the output of the first comparator 14 is at LJ level and the compressor 3 is stopped, the output of the converter 20 is at L level, and the reset of the counter 22 is released. Moreover, since the "L" level output of the converter 20 is input to the oscillator 23 via the inverter 21, the input of the oscillator 23 becomes "H" level and starts oscillation. The oscillation frequency is input to the counter 22 and starts counting. When the count number of the counter 22 reaches a count number corresponding to seven minutes, the rHJ level is output to the differential circuit 17. Therefore, the differential of the differential circuit 17 is reset to (do, 6'c), and at this time, the temperature detected by the first temperature sensor 16 is set by the temperature setting volume 15, and the compressor 3 is stopped. When the temperature is higher than the temperature plus the differential of 0.5°C, the output of the first comparator 14 is at the "H" level, and the compressor 3 is forcibly started. However, once the compressor starts.

The output of the converter 2Q becomes "H" level, the counter 22 is reset, the output of the counter 22 becomes "L" level, and the differential/LIQ17
Differential U again.

2.0" GK is set. Similarly, the above counter 2
2 is counting, when the compressor 3 is started), the output of the converter 20 becomes "H" level, and the count value of the counter is set. The first controller 24 is constituted by the above-mentioned electronic circuit.

The circuit configuration of the second controller 25 is as follows. 26
is a second comparator, and is the output voltage value of the humidity sensor 27 which detects the indoor humidity by a change in resistance value.

The output of a reference voltage generator that outputs a voltage corresponding to the value when the humidity of the humidity sensor 27 is, for example, 60% R0H, is compared, and the humidity detected by the humidity sensor is 60% RE, for example.
Outputs HJ level only when raising the height. A second differential circuit 29 sets the differential of the second comparator, and is set to, for example, 3%R and H0.

The output of the second comparator 26 is passed through a buffer 7.30 to
It is input to the second relay 11. When the output of the second comparator 26 is at the "H" level, priority is given to the air volume changeover switch 13 and the air volume is set to low. The second comparator 26
When the output is at the rLJ level, the air volume is determined only by the air volume changeover switch 13.

In the above configuration, the operation of one embodiment of the present invention is
This will be explained with reference to FIG. 3, which is a diagram and a time chart. Third
In the figure, at the start of operation, when the room temperature detected by the humidity sensor 16 is higher than the set temperature set by the temperature setting volume 15, the compressor 3 is in operation and the room temperature falls below the set temperature. This continues until time T1. During this time, the output of the converter 2o is at HI level, so the counter 22
When the room temperature falls below the set temperature during time T1 in which the compressor 3 is in the reset state, the compressor 3 stops. At this time, the bright side of the converter 20 reaches the rLJ level, the reset of the counter 22 is released, the oscillator 23 starts oscillating, and the counter 22 starts counting the oscillation frequency. While the counter 22 is counting, the counter output is "
Due to the "L" level, the differential is 2.0°C. However, in this case, the count number has not reached the number corresponding to 7 minutes, so the output of the counter 22 becomes rHJ level and the differential is set to 0.5.
Before the temperature is reset to .degree. C., at time T2, the room temperature becomes equal to or higher than the set temperature plus the differential temperature of 2.0.degree. C., and the compressor 3 resumes operation. Once the compressor 3 is operated, the output of the converter 2o is [H]
level, and the count number of the counter 22 is reset. The same applies to time T3 to T4. However, when the compressor 3 stops at 1 hour T6 and the count number of the counter 22 reaches a count corresponding to 7 minutes, the output of the counter 22 does not reach the rHJ level, and the differential set by the differential circuit changes. It becomes 0.5°C. As a result, the room temperature becomes higher than the set temperature plus the differential temperature of 0.5°C at this time, and the compressor 3a.

Start driving. Immediately after starting operation, the output of the converter 20 becomes rHl level, the counter 22 is reset, and the output becomes [L level]. Therefore, the differential of the above differential circuit is 2. ,
, is reset to OoC.

Also, when the compressor 3 stops at time T7, after 7 minutes of stoppage has elapsed, the differential is turned to O, as described above.
Even if the setting is reset to SoC, the room temperature is still low, so the compressor 3 does not operate. At this time.

The differential remains set at 0.6°C.

At time T9, the room temperature becomes higher than the set temperature plus the differential temperature of 0.5°C.

The compressor 3 starts operating. At the same time as the start of operation, the differential is reset to 2.0°C in the same way as described above.

At this time, when the setting of the air volume selector switch 13 is strong wind and the humidity detected by the humidity sensor 26 is 60% R, H or less, the indoor fan 7 operates as a strong wind as set, but the humidity is When the temperature exceeds 60% R, H0, the indoor blower 7 is forced to operate at 1 weak wind. After this, if the humidity increases and reaches 63% R0H0 or higher, the indoor blower 7
According to the setting of the air volume selector switch 13, strong wind operation is performed. When the air volume selector switch 13 is set to low wind,
Always operate with low wind regardless of indoor humidity.

Therefore, in this embodiment, when the stop time of the compressor 3 reaches 7 minutes, the differential for indoor temperature control is reduced from 2.0°C to 0.6°C, and the compressor 3 is forcibly stopped. Start it and gah.

When the indoor humidity is higher than 60% F1. H. In the following cases, the air volume is maintained at the level set manually by the user. Due to this, the indoor humidity is higher than 60 degrees R,H,
Mainly in areas where high humidity is a major factor in discomfort, it prevents moisture from returning to the air-conditioned space when the compressor 3 is stopped.

In areas where the indoor humidity is lower than 60 degrees R, H, and high temperatures are a major factor in discomfort, when the compressor 3 is stopped, the air flow rate decreases and the perceived temperature does not rise. The effect is that it can be done as follows.

Effects of the Invention As is clear from the above description, the air conditioner control device of the present invention includes a temperature sensor that detects indoor temperature, a humidity sensor that detects indoor humidity, and , a first controller having a counter that controls the compressor, counts the compressor stop time, and forcibly starts operation of the compressor within a predetermined time; and according to the humidity detected by the humidity sensor, This device has a second controller that forcibly switches the indoor blower to low-air operation when the compressor is stopped, so in high humidity areas where humidity is a major factor in discomfort, it is possible to prevent moisture from flowing when the compressor is stopped. This prevents the air from returning from the air conditioner to the conditioned space, and also prevents the airflow from decreasing when the compressor is stopped and causing the perceived temperature to rise in low humidity areas where temperature is a major factor in discomfort. It is intended to prevent Therefore, the temperature and humidity of the air-conditioned space can be controlled to the ideal temperature and humidity.

[Brief explanation of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to an embodiment of the present invention, and FIG. 2 is a circuit block diagram of a control device of the air conditioner.
FIG. 3 is a time chart showing the operation of the same device, and FIGS. 4 and 5 are time charts showing the operation of the conventional air conditioner. 3...Compressor, 4-...Outdoor coil, 5...
... pressure reducer, 6 ... indoor coil, 7 ...
... Indoor blower, 16 ... Temperature sensor, 22
... Counter, 24 ... First controller,
26...Second controller, 27...Humidity sensor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure/ ? 5 Figure 2 Figure 3

Claims (1)

[Claims] A refrigeration cycle consisting of a compressor, an indoor coil, an outdoor coil, a pressure reducer, etc., an indoor blower that can be operated at high or low strength to ventilate the indoor coil, a temperature sensor that detects indoor temperature, and a humidity sensor that detects indoor humidity; a first controller having a counter that controls the compressor according to the temperature detected by the temperature sensor, counts the compressor stop time, and forcibly starts operation of the compressor within a predetermined time; A control device for an air conditioner, comprising a second controller that forcibly switches the indoor blower to low-air operation when the compressor stops, depending on the humidity detected by the humidity sensor.