JPS6018898B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner, and more particularly to an air conditioner with a novel structure equipped with an automatic operation control device for maintaining a comfortable environment.

Air conditioners that automatically adjust the room temperature to match the set temperature usually have a slight temperature difference between the temperature point at startup and the temperature point at shutdown. It is.

This is necessary in order to prevent frequent starting and stopping and to prevent irregularities.

However, with air conditioners that use this type of control, depending on the load situation, there may be a long interruption in operation between stopping and restarting, and during this time, humidity may increase, etc. In addition to the inconvenience of having to repeatedly change the temperature settings, long interruptions in operation can also lead to a misunderstanding as if the automated driving system is malfunctioning. I didn't like it.

The present invention has been made in order to cope with the above-mentioned situation and to provide an air conditioner with a novel configuration that can eliminate all of the above-mentioned problems and maintain a comfortable environment. In particular, for an air conditioner that performs a cooling operation and a dehumidifying operation, it includes a room temperature detection circuit 17, a compressor drive circuit 18, a temperature shift down circuit 19, a sliding door means 21, and a first It is equipped with a timer circuit 22 and a second timer circuit 23, and the compressor 1 is driven by the start signal from the room temperature detection circuit 17 by the compressor drive circuit 18,
While the compressor 1 is stopped by the stop signal and automatic temperature adjustment is performed, driving of the compressor 1 is prohibited for a first set time from the time when the compressor 1 is stopped, and then for a second set time tQ. If the start signal is not issued even after the elapse of time, the dehumidifying operation is performed, and at the same time, the temperature shift down circuit 19 shifts down the start signal generation temperature point T to a lower intermediate temperature point T, The stop signal generation temperature point L also changes to the lower temperature point T2 by the same shift down width.
The downshift is then canceled by the cooling signal from the second timer circuit 23 or the stop signal from the room temperature detection circuit 17, and when the third set time t2 has elapsed, the dehumidifying operation is changed to the cooling operation. It was designed to switch to .

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a basic refrigeration circuit of an air conditioner/dehumidifier according to an example of the air conditioner of the present invention. respectively.

The outdoor unit consists of compressor 1, condenser 2, and accumulator 3.
The indoor unit has a solenoid valve 5 and a bypass pipe 4 omitted from the condenser 2, while the indoor unit is equipped with a reheater 6, a pressure reducer 7, and an evaporator 8. It forms a directional refrigerant circulation circuit.

In the figure, numerals 9 and 10 indicate an outdoor fan and an indoor fan. During cooling operation, by closing the solenoid valve 5, the condensation heat exchange of the high-pressure refrigerant is carried out by the condenser 2, and the reheating coil 6 is prevented from functioning.
During dehumidification operation, by opening the electromagnetic valve 5, the condenser 2 is not used for heat exchange but merely functions as a liquid receiver, and the reheater 6 performs condensation heat exchange, and the evaporator 8 performs heat exchange. The indoor air that has been degreened and cooled is sent to the reheater 6.
The dehumidifying operation is performed by reheating the air and producing cold air or warm air.

The electric circuit that controls the operation of this air conditioner/dehumidifier is shown in Figure 2.
s, outdoor fan motor 9M, indoor fan motor 10
Consisting of skin electromagnetic relays 11, 12, 13, operation switch 14, and control circuit 15, compressor motor IM and indoor fan motor 01 are operated by energization of electromagnetic relay 12, and outdoor fan motor 9M is operated by energization of electromagnetic relay 12. When the electromagnetic relay 12 is energized and the electromagnetic relay 11 is de-energized, the air flow is high, and when the relay 11 is energized, the air flow is low.

Furthermore, while the electromagnetic valve coil 5s and the electromagnetic relay 11 are excited by the energization of the electromagnetic relay 13, the control circuit 1
5 is always energized by turning on the operation switch 14.

The control circuit 15 is a fundamental component that characterizes the present invention, and an example of the circuit is shown in FIG.
The circuit 15 includes a DC power supply circuit 16, a room temperature detection circuit 17,
Compressor drive circuit 18, temperature shift down circuit 19, first
Timer circuit 22, second timer circuit 23, and switching means 21
It consists of

The DC power supply circuit 16 includes the above-mentioned circuits 17, 18, 19, 20.
, 21, 22, 23, and each other circuit 17, 18, 19, 20, 21, 22.
, 23 will be sequentially explained below with reference to FIGS. 4 to 7.

Room temperature detection circuit 17: Thermistor TH, variable resistor VR, resistor R, ~ arranged in the indoor air intake passage of the air conditioner/dehumidifier.
R3 and comparator CO. The thermistor TH is the first side, the variable resistor VR is the second side, the resistor R is the third side, and the resistor (R20R3) is the fourth side, forming a bridge circuit. The potential e between the side and the second side, and the potential between the third side and
The potential e2 of the fourth side is connected to the comparator CO. The relay 12 of the compressor drive circuit 18, which will be described later based on the comparison results,
Turn on and off.

When the room temperature rs increases, the resistance of the thermistor TH decreases and the potential e becomes greater than the potential e2, and the comparator CO. The output becomes L level and issues a start signal, while the room temperature Ts
Conversely, when the potential e. <e2, and the comparator CO. The output becomes high level and issues a stop signal. This room temperature detection circuit 17 has a temperature point T2 at which a start signal is generated when a start signal is issued and a stop signal generation temperature point T2 at which a stop signal is issued, the former T being higher than the latter T2. It operates with a differential.

Compressor drive circuit 18: Comprised of transistors Q2, Q3 and an electromagnetic relay 12, the PNP transistor Q2 has its base connected to the comparator CO. The collector is connected to the output terminal of the NPN transistor Q via a resistor, and the collector is connected to the base of an NPN transistor Q via a resistor.

On the other hand, the transistor Q3 is connected to the coil 12 of the electromagnetic relay 12.
c and the collector/emitter are connected in series.

Comparator CO. When the output becomes L level (a state in which a start signal is issued), both transistors Q2 and Q3 become conductive, and the electromagnetic relay 12 is energized to drive the compressor 1. On the other hand,
Comparator CO. When the output reaches H level (a state in which a stop signal is issued), the magnetic fin relay 12 is deenergized and the compressor 1 is stopped.

Switching means 21: For convenience of explanation, it will be described before each of the circuits 19, 22, and 23, but it has the same circuit configuration as the compressor drive circuit 18, and has a circuit configuration similar to that of the compressor drive circuit 18, and is connected to the transistors Q7, Q8 and the electromagnetic relay 13. When the output of the comparator Co3 at the final stage of the second timer circuit 23 becomes L level (the state in which the dehumidification signal is issued), both transistors Q7 and Q8 become conductive, the electromagnetic relay 13 is energized, and the air conditioning On the other hand, when the output of comparator Co3 reaches H level (a state in which a cooling signal is issued), electromagnetic relay 13 is activated.
The air conditioner operates in a manner similar to the cooling operation cycle.

Temperature shift down circuit. 19: Consists of transistor Q and diode D4,
Transistor Q is provided to short-circuit a portion of the fourth side resistor R3 in the room temperature detection circuit 17 by conductive operation, while diode D4 has its blocking side connected to transistor Q. , and the flow side thereof is connected to the collector of the transistor Q7, that is, to the ground side via a resistor.

When the transistor Q7 becomes conductive, that is, generates a dehumidification signal, the transistor Q? will apply the rising collector potential of CO. ■It operates to lower the input side potential. By operating in this manner, the start signal generation temperature point T of the room temperature detection circuit 17 is changed to both temperature points and the stop signal generation temperature point T. , T2 intermediate temperature points T,L
The temperature point T2 at which the stop signal is generated is automatically shifted down by the same amount as the shift down width to the lower temperature point T2 having the differential, and the electromagnetic relay 13 is deenergized. This will cancel the downshift effect.

First timer circuit 22: from the time when the electromagnetic relay 12 is turned from energized to de-energized, for the first set time, for example, 3 minutes,
This circuit forcibly keeps the electromagnetic relay 12 deenergized and prohibits the compressor 1 from driving, even if an energization command is issued.

Transistor Q4, capacitor C, each resistor R, . ~R
, 5, a comparator Co2 and a diode D, and operates as follows.

When the electromagnetic relay 12 is energized, the transistor Q becomes non-conductive, and the timer capacitor C is connected to each resistor K, 3.
, R,5, a charge corresponding to the voltage of the resistor R,2 connected in parallel with the capacitor C is charged almost instantaneously.

Moreover, at the time when the electromagnetic relay 12 changes from deenergized to energized,
The output of comparator C becomes an H level voltage. Then, when the transistor Q3 is turned off, that is, the compressor 1
When Q stops, transistor Q turns on and conducts.
The input side potential of comparator C female is resistor R, 3 and R, 4.
While the divided potential of comparator Co2 is inputted,
The potential on the input side becomes higher than the divided potential, and the charge on the capacitor C is transferred to the resistors R, . During the first set time to (3 minutes) for discharging through
Therefore, the base of transistor Q becomes L level via diode D.

Therefore, the off state of transistor Q3 is maintained for 3 minutes.

Then, the charge on the capacitor C, is transferred to the resistor R, . 3 minutes after completion of discharge, the output of comparator Co2 is set to H.
The base of the transistor Q is released from the L level. Thus, for 3 minutes after the compressor 1 stops, even if the room temperature is as shown in FIG.
Even if the starting signal generation temperature point T is reached for starting, it is prevented from being turned on again.

Note that during this first set time, the capacitor C and the discharge resistors R, . The length can be adjusted by selecting the capacity of
It is contrary to the spirit of the present invention to make the time shorter than the time required for the difference between the high and low pressures to gradually decrease and reach a balanced state after the compressor 1 stops in the refrigeration circuit. It is necessary to set the time longer than the time at which the load is removed and no overload is applied when returning to work.

Second timer circuit 23: This circuit 23 includes transistors Q, Q, capacitor C2,
It is constructed using diodes D2 and D5, resistors R5 to R6, and comparator Co3 as elements.

The operation of the circuit 23 can be explained as follows: The first timer circuit 22 is in operation, that is, the comparator C is in operation.

2 is an L-level output, both transistors Q and Q turn on, and the charge on capacitor C2 becomes a resistor. It is discharged through the voltage and becomes close to OV.

At this time, relay 13 is deenergized.

When the comparator Co2 becomes H level after 3 minutes, the capacitor C2 is charged through the resistors (R5 and R6).

The charging time tQ at this time, that is, the second set time is selected as appropriate, but in the above example, it is set to 5 minutes.

In this way, after the compressor 1 stops, t, = 10 tQ
In other words, when the e-input side potential of comparator C03 becomes equal to or higher than its input side potential after 8 minutes have elapsed, the output of comparator Co3 becomes L level, and transistors Q7 and Q
8 is turned on, the electromagnetic relay 13 is energized and the refrigeration circuit enters the dehumidification cycle. At the same time, the temperature is shifted down from T, to T, L, and from T2 to T2L. '01 This) comparator CO. When e input side potential>output side potential, that is, when the room temperature Ts is higher than the temperature point T2, the electromagnetic relay 12 is turned on, and the dehumidifying operation is therefore started.

During this dehumidification operation, the charge in capacitor C2 starts discharging through a time constant circuit consisting of resistors R6 and R8, and diode D5, and does not reach the lower temperature point T, → T2L during the elapse of the second set time etc. In this case, when the air conditioning load is large as shown in FIG. 4, the electromagnetic relay 13 is turned off after the second set time has elapsed, and the dehumidification operation circuit is switched to the cooling operation circuit, causing the room temperature Ts to drop quickly. can be done.

At the same time, the transistor Q is turned off, and the transistor is released and returns to T,→T,L,T2L→T2. 9 During the dehumidifying operation, if the lower temperature point T becomes public during the second set time t5, the comparator Co. is at H level, the transistor Q3 is turned off, and the transistor Q is turned on. The remaining charge in the capacitor C2 is instantly discharged through the resistor R7, the electromagnetic relays 12 and 13 are turned off, and the dehumidifying operation is interrupted. At the same time, the first timer circuit 22 The timing will be restarted upon return, and the downshift will be canceled, and T, L→
T, , T2L returns to L, respectively.

This operating state is a lotus-faced mode when the air conditioner load is moderate, as shown in FIG.

When the air conditioning load is small as shown in Fig. 6 with the dehumidification cycle switched to as described in the above section [A] and downshifts from T, → T, L, T2 → T2L performed. That is, the comparator Co. of the room temperature detection circuit 17.
However, when the e input side potential is less than the input side potential, the electromagnetic relay 12 is in a standby state and does not enter the operating state until the two military positions become equal. When the compressor 1 is energized and the air conditioning operation by dehumidifying operation is resumed, the transistor Q. Since the collector potential of remains at L level, T, → T, L, T2
→Continue dehumidifying operation with T enemy downshifted.

As clarified by the above explanation, the above-mentioned cold mist/dehumidifier has different temperature settings,
When the room temperature Ts reaches the start signal generation temperature point T, within a certain period of time (t, = to + tQ) of the stop time, the cooling operation is restarted, and after the certain period of time elapses, the room temperature Ts reaches the temperature point T, If the temperature point T does not rise to the intermediate temperature point T, L, and the stop signal generation temperature point L is shifted down to the lower temperature point T2L, and when the room temperature Ts reaches the intermediate temperature point T, L, It is characterized by operating to perform dehumidification operation.

However, the present invention is not limited to restarting operation after shifting down the set temperature to the intermediate temperature points T and L, and it is of course possible to perform this operation in cooling operation. .

Furthermore, the certain period of time t is sufficient as long as it is enough for the high and low voltages to be balanced, and the required time set only by the first timer circuit 23 is also sufficient.
The present invention has the configuration as described above, and when the room temperature Ts reaches a preset starting signal generation temperature point T within a certain period of time after the air conditioning operation is stopped, the air conditioning operation is resumed. On the other hand, if the room temperature Ts does not reach the temperature point T within the certain time period t, intermediate temperature points T and L lower than the temperature point T and higher than the stop signal generation temperature point T2 and the Since the air conditioning operation is restarted at the set temperature based on the set temperature that is shifted down to the lower temperature point T lower than the temperature point T2, the operation interruption time is longer as a phenomenon such as when the indoor load is light. This makes it possible to eliminate the tendency to feel stuffy and uncomfortable due to the influence of humidity.

Furthermore, in the past, the temperature setting of the temperature controller was artificially changed when the user felt discomfort, which made the operation complicated and caused the room temperature to fluctuate. Since the temperature setting is automatically changed and the temperature is restored to the original temperature after restarting operation, once the temperature is set, there is no need for any human intervention, making operation extremely convenient. It is.

In addition, if the operation is not resumed after a predetermined period of time has elapsed since the operation was interrupted, the system is made to wait until the temperature reaches the intermediate temperature points T and L, so that the operation can be forcibly restarted after a predetermined time. In comparison, it has the characteristic of significantly reducing power consumption and reducing running costs.

Furthermore, since the predetermined time t is set to a time sufficient to balance the high and low pressures in the refrigeration circuit, there is no risk of applying an excessive load to the compressor when restarting operation, and smooth startup is possible. is accomplished.

Moreover, since the present invention automatically sets the temperature point at which the stop signal is generated during dehumidification operation to a lower temperature point T, there is an advantage that the dehumidification operation becomes longer and the dehumidification effect is further exerted especially at low load. .

[Brief explanation of the drawing]

FIG. 1 is a refrigeration circuit diagram of an air conditioner/dehumidifier according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the air conditioner/dehumidifier, and FIG. 3 is an expanded circuit diagram of the control circuit section in FIG. 2. , FIG. 4 to FIG. 7 are temperature-time relationship diagrams showing various patterns of air conditioning operation by the air conditioner of the present invention. 1... Compressor, 2... Condenser, 6...
... Reheater, 7 ... Pressure reducer, 8 ... Evaporator, 17 ... Room temperature detection circuit, 18 ...
Compressor drive circuit, 19...Temperature shift down circuit, 21...Switching means, 22...First
Timer circuit, 23...Second timer circuit, T,...
・Start signal generation temperature point, T2...Stop signal generation temperature point, Ts...Room temperature T, L...Middle temperature point, T2L...Low temperature point , I... Fixed time, to... First set time, tQ...
...Second set time, t2...Third set time. , Z diagram, Kaya' diagram, Figure 3, Kōku Bakujutsu, Diagram 5, Diamond diagram, 7 diagrams.

Claims (1)

[Claims] 1 An air conditioner in which a compressor 1, a condenser 2, a reheater 6, a pressure reducer 7, and an evaporator 8 form a cooling operation circuit and a dehumidification operation circuit, and are capable of switching between cooling operation and heating operation. Then, the room temperature Ts is detected, and the start signal is generated by comparing this room temperature Ts with the start signal generation temperature point T_1 when the start signal is issued, and the stop signal generation temperature point when the stop signal is issued is compared with the room temperature Ts. A room temperature detection device that generates a stop signal by comparing the start signal temperature point T_1 and the stop signal generation temperature point T_2, and has a differential in which the former has a higher value than the latter. circuit 17
a compressor drive circuit 18 that drives the compressor 1 in response to a start signal from the room temperature detection circuit 17 and stops the compressor 1 in response to a stop signal; and a compressor drive circuit 18 that starts measuring time in response to a stop signal from the room temperature detection circuit; A first timer circuit 22 prohibits the driving of the compressor 1 during a first set time t_0, and a time measurement is started by a time measurement end signal of the first timer circuit 22, and after a second set time t_2 elapses, a dehumidification signal is sent. While outputting the dehumidification signal, the room temperature detection circuit 17 is outputting the dehumidification signal.
The second controller starts timing with the activation signal of
The timer circuit 23 and the dehumidifying signal from the second timer circuit 23 set the activation signal generation temperature point T_1 of the room temperature detection circuit 17 to an intermediate temperature between the activation signal generation temperature point T_1 and the stop signal generation temperature point T_2. At the same time, the stop signal generation temperature point T_2 is also shifted down to the lower temperature point T_2_L by the same amount as the downshift width of the start signal generation temperature point T_1, while the cooling signal of the second timer circuit 23 or the Room temperature detection circuit 1
7, a temperature shift down circuit 19 cancels the downshift of the start signal generation temperature point T_1 and the stop signal generation temperature point T_2; and a dehumidification operation circuit according to the dehumidification signal of the second timer circuit 23; An air conditioner characterized in that the air conditioner is further provided with a switching means 21 which changes the operating circuit to the cooling operating circuit in response to a cooling signal.