JPH0240437A - Air conditioner - Google Patents

Abstract

PURPOSE:To stabilize control and to prevent frequent on-off operation of a compressor by individually regulating a flow control valve between a room evaporator and the compressor according to the differential humidity between the detected room humidity and the set humidity, and a flow control valve between the compressor and a room condenser according to the differential temperature between the detected room temperature and the set temperature. CONSTITUTION:A first flow control valve 13 is installed between a compressor 1 and a room evaporator 4, and a second flow control valve 16 between the compressor 1 and a room condenser 5. On the one hand, the room humidity is detected by a humidity detector 11 and input to a first controller 12. The first controller compares the detected room humidity with the set humidity and regulates the first control valve 13 to adjust the cooling-dehumidifying capacity. On the other hand, the room temperature is detected by a temperature detector 14 and is compared with the set temperature by a second controller 15. The second controller regulates the second flow control valve 16 to regulate the cooling capacity of the condenser 5. By this configuration, a stable control is attained, preventing frequent on-off operation of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air conditioner that accurately controls temperature and humidity.

[Conventional technology]

FIG. 2 is a configuration diagram showing a conventional air conditioner.

In the figure, 1 is a compressor that compresses the refrigerant, 2 is an outdoor condenser, 3 is a throttle device that reduces the pressure of the refrigerant, 4 is an indoor evaporator, and 5 is installed on the lee side of the indoor evaporator 4. 6 is an outdoor fan, 7 is an indoor fan, 8 is a humidity controller, 9 is a temperature controller, 10 is an electromagnetic device installed between the compressor 1 and the indoor condenser 5. It is a valve.

Moreover, FIG. 3 is a circuit diagram showing a control circuit of a conventional air conditioner. In the figure, 8m is a contact point of the humidity regulator 8, which becomes a closed circuit when the humidity rises. 9a is a movable contact of the temperature regulator 9. The movable contact 91 connects with the fixed contact 9b when the temperature rises, and conversely connects with the fixed contact 9C when the temperature drops. Further, 10m is a coil of the electromagnetic valve 10, and 10b is an electromagnetic contactor for the compressor.

Next, the operation will be explained. The high-pressure refrigerant gas discharged by the compressor 1 radiates heat in the outdoor condenser 2, is liquefied, and flows into the expansion device 3. The refrigerant flowing into the expansion device 3 is depressurized to a low pressure and low temperature, absorbs heat in the indoor evaporator 4, becomes gasified, and is sucked into the compressor 1 again. In this way, the refrigerant forms a circulating cooling cycle.

On the other hand, indoor air is blown by the indoor blower 7, and is cooled and dehumidified when passing through the indoor evaporator 4. At this time, if the indoor temperature and humidity loads are equal to the cooling and dehumidifying capacity, an equilibrium state can be maintained, but if the indoor temperature load decreases, the room temperature reaches the set temperature of the temperature controller 9, and the Since the contact 9a is connected to the fixed contact 9C, the solenoid valve 10 is opened. When the solenoid valve 10 is opened, a portion of the high-pressure refrigerant gas discharged from the compressor 1 radiates heat in the indoor condenser 5. As a result, the indoor air blown by the indoor blower 7 is cooled and dehumidified when passing through the indoor evaporator 4, and then reheated and dehumidified when passing through the indoor condenser 5. . In addition, when the indoor humidity load decreases,
When the indoor humidity reaches the set humidity of the humidity controller 8, the contact point 8a in FIG. 3 is opened and the compressor electromagnetic contactor 10b is demagnetized. When the contactor 10b is demagnetized, the compressor 1 stops, and the cooling and dehumidifying ability is lost. after that,
When the temperature or humidity load in the room reaches the restart set temperature or humidity, the load is controlled by repeating operation and stopping.

[Problem to be solved by the invention]

However, since conventional air conditioners are configured as described above, when there is a demand for narrowing the control width of indoor temperature and humidity, it is necessary to control the switching of contact 8a and movable contact 9 in small increments. Ta.

Therefore, there are disadvantages such as frequent opening and closing of the solenoid valve 10 and frequent switching between operation and stop of the compressor 1, which shortens the service life. Further, if a certain limit is placed on the control range of temperature and humidity in order to protect the solenoid valve 10 and the compressor 1, there is a drawback that the accuracy of control cannot be improved.

The present invention has been devised to overcome the above-mentioned drawbacks.
It is an object of the present invention to provide an air conditioner that can perform stable cooling and dehumidification capacity control against indoor load fluctuations and can prevent frequent operation and stop of a compressor.

[Means to solve the problem]

The air conditioner according to the present invention includes a first flow control valve provided between an indoor evaporator and a compressor, and a second flow control valve provided between the compressor and an indoor condenser. a first controller that detects the indoor humidity, compares it with a preset humidity, and controls the first flow rate control valve based on the result; A comparison calculation is made with the set temperature, and based on the result, the second
and a second controller for controlling the flow rate regulating valve.

[Effect]

The first controller controls the first flow rate control valve and thereby controls the dehumidification capacity of indoor air. Further, the second controller controls the cooling capacity of indoor air by controlling the second flow control valve.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an air conditioner showing one embodiment of the present invention. In the figure, the same or equivalent parts as in FIG. 2 are given the same reference numerals. 11 is a humidity detector installed indoors; 12 is a first controller that receives a signal from the humidity detector 11 and performs a comparison calculation with a preset humidity; 13 is a controller that receives a signal output from the controller 12; This is the first flow control valve that is controlled by the flow control valve. Further, 14 is a temperature detector provided indoors, 15 is a second controller that inputs the signal from the temperature detector 14 and performs a comparison calculation with a preset temperature, and 16 is an output from the controller 15. This is a second flow control valve that is controlled by a signal. Note that the indoor fan 7 blows air from the indoor evaporator 4 to the indoor condenser 5 (indicated by broken lines), and causes the air to reach the humidity detector 11 and the temperature sensor 14.

Next, the operation will be explained. The high-pressure refrigerant gas discharged from the compressor 1 is sent to the outdoor condenser 2. The air is supplied to the indoor evaporator 4 via the expansion device 3, and then returns to the compressor 1 again, forming a circulating refrigeration cycle. On the other hand, indoor air is blown by the indoor blower 7, and is cooled and dehumidified when passing through the indoor evaporator 4.

Now, if the indoor temperature load decreases, the temperature sensor 14
detects the room temperature and outputs the detection signal to the first controller 15. When the controller 15 receives this detection signal, it compares it with a preset temperature setting value and outputs an output signal to the second flow rate control valve 16 in accordance with the difference between the detection signal and the temperature setting value. When receiving this output signal, the control valve 16 gradually changes the valve from "closed" to "open" to supply a portion of the refrigerant gas discharged from the compressor 1 to the indoor condenser 5 .

When supplied with refrigerant gas, the condenser 5 condenses the refrigerant gas and releases heat. As a result, the indoor air blown by the indoor blower 7 is cooled and dehumidified when passing through the indoor evaporator 4, and then reheated by heat radiation when passing through the indoor condenser 5.

Therefore, the indoor air is dehumidified but not cooled, and is controlled to a constant set temperature.

In addition, when the indoor humidity load decreases, the humidity detector 11
detects the indoor humidity and sends the detection signal to the first controller 1.
Output to 2. When the controller 12 receives this detection signal, it compares it with a preset humidity setting value and outputs an output signal to the first flow control valve 13 in accordance with the difference between the detection signal and the humidity setting value. When the control valve 13 receives this output signal, the valve is gradually closed from "open" to reduce the amount of refrigerant sucked into the compressor 1. As a result, the cooling and dehumidifying ability of the indoor evaporator 4 is reduced, and the indoor humidity is controlled to a constant humidity. At this time, the cooling capacity also decreases at the same time, but due to the operation of the second controller 15 described above, the second flow rate control valve 16 gradually changes from "open" to "closed", so that the indoor condenser 5 The amount of heat dissipated is reduced and the cooling capacity does not change as a result. Therefore, the indoor humidity and humidity load can be controlled to maintain a balanced state.

In this way, in this embodiment, the first controller 12 that determines the indoor humidity and the second controller 15 that determines the indoor temperature control the opening of the first and second flow control valves 13.16. Since the temperature is controlled, it is possible to perform stable control of indoor humidity and temperature loads, which eliminates the need for frequent compressor operation in the past.
This has the effect of preventing stop switching.

[Effects of the Invention] As explained above, the present invention has a first controller that determines the indoor humidity, a second controller that determines the indoor temperature, and a first and second flow rate adjustment. Since the valves are controlled, the dehumidification capacity and the cooling capacity can be controlled, and an equilibrium state between the indoor temperature and humidity loads and the cooling and dehumidification capacity can be maintained. Therefore, even if there is a demand for narrowing the control width of indoor temperature and humidity, the conventional small-scale control is not required, and the compressor can be prevented from frequently switching between operation and stop. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an air conditioner showing an embodiment of the present invention, FIG. 2 is a conventional block diagram, and FIG. 3 is a circuit diagram showing a conventional control circuit. 1...Compressor, 2...Outdoor condenser, 3...
- Throttle device, 4...Indoor evaporator, 5...Indoor condenser, 6...Outdoor blower, T...Indoor blower, 11...Humidity detector , 12...first controller, 13...first flow control valve, 14...
Temperature detector, 15...second controller, 16 fist...
A second flow control valve.

Claims (1)

[Claims] A compressor that compresses refrigerant, an outdoor condenser that is blown by an outdoor fan, and a throttle device that reduces the pressure of the refrigerant.
An air conditioner comprising an indoor evaporator that is blown by an indoor blower, and an indoor condenser that is provided on the leeward side of the indoor evaporator that blows air and is connected in parallel to the outdoor condenser. In the machine, a first evaporator provided between the indoor evaporator and the compressor
a second flow control valve provided between the compressor and the indoor condenser;
a first controller that detects indoor humidity, compares it with a preset humidity, and controls the first flow control valve based on the result; and a first controller that controls the indoor temperature. An air conditioner comprising: a second controller that detects and compares the temperature with a preset temperature, and controls the second flow control valve based on the result.