JPS623651Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a window-type air conditioner in which a window that can be opened and closed is located on the back side of a condenser.

In recent years, the mainstream of window-type air conditioners has become one that allows the window to be fully closed even if it is installed in a window. When operating this type of air conditioner, it is necessary to open the window slightly for heat exchange between the indoor unit and the heat dissipation unit, but sometimes the air conditioner is operated with the window fully closed. There is a risk that mistakes such as putting it away may occur.

If such an air conditioner is operated with the windows fully closed, the condenser in the heat dissipation unit will not be able to exchange heat, causing an abnormal rise in temperature and pressure, which is dangerous. Possible ways to deal with this problem include using a high-pressure cutter to prevent pressure rises or installing a thermostat on the heat exchanger of the heat dissipation unit to shut down the operation, but currently, pressure rises cannot be detected. The only overload safety device used is to stop the operation. This safety device is for example 41Kg/
If a pressure increase of more than cm ² is detected, it will break down and trip, stopping the operation of the air conditioner.

However, such safety devices have safety issues because they detect high pressure after the heat dissipation unit reaches high pressure, and they require expensive parts such as pressure sensors.Furthermore, in the event of a gas leak, even if the windows are closed, operation is not possible. Even if they did, the safety devices would not work and
There is a problem in that problems such as overheating and galling of the compressor occur.

Therefore, the purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional technology, detect temperature changes using a temperature sensor and a timer, detect abnormalities in closing the window on the back of the capacitor, and abnormalities in gas leaks, thereby safely and reliably preventing abnormal operations. An object of the present invention is to provide a window-type air conditioning control device that can be used to control air conditioning.

The present invention will be further explained below with reference to the drawings.

FIG. 1 is a circuit diagram of an air conditioning control device according to an embodiment of the present invention, in which 1 is a compressor, 2 is a condenser for heat exchange, 3 is a capillary reach tube, and 4 is an evaporator of an indoor unit. ,
5 is a fan motor for blowing air to the capacitor 2; 6 is a thermistor for detecting the temperature on the _outlet side of the evaporator 4; 7 is a voltage V _EE and A comparator 8 is set by a combination of the values of resistors R ₁ , R ₂ , and R ₃ inserted between V _SS , and 8 is a comparator that is set for a certain period of time from the time when the contact 11 of the room thermostat that detects the room temperature is closed. Afterwards, an H level signal is output,
A timer that is reset when the contact 11 is opened; 9 is an AND gate that takes the logical product of the outputs of the comparator 7 and the timer 8; and R _y1 is a transistor T _r operated by the output of the AND gate 9.
₁ is a relay that operates when the relay R _y1 is activated; 12 is a lamp that is lit by the operation of the relay R _y2 ;
0 indicates a power switch. It is assumed that a window that can be opened and closed is located on the back side of the capacitor 2.

The operation of the configuration as described above will now be explained with reference to the characteristic diagram in FIG. 2 and the time chart in FIG. 3. By the way, the characteristic diagram in Figure 2 shows the temperature change of each part with respect to time after the start of operation of the compressor 1. Figure a shows the temperature change on the inlet side of the evaporator 4 during normal operation, and b shows the temperature change on the inlet side of the evaporator 4 during normal operation. 4, c is the temperature change of the evaporator 4 when the window is closed, and d is the temperature change of the evaporator 4 when a gas leak occurs. On the other hand, in FIG. 3, A is the on/off of the power switch 10, B is the on/off of the capacitor 2, C is the input signal of the timer 8, D is the output signal of the timer 8, E is the output signal of the comparator 7, F is the output signal of the AND gate 9, G is the on/off of the contact 11 of the room thermostat, H is the on/off of the lamp 12, and I is the input signal of the comparator 7 due to the resistance R ₃ of the thermistor 6 and the resistance R ₁ , _R2 , respectively.

Assuming that the air conditioner operates normally, after the compressor 2 is started, the temperature on the outlet side of the evaporator 4 decreases as shown by curve 6 in FIG. 2 and settles to a predetermined temperature. On the other hand, if the vehicle is operated with the windows closed, as shown by curve C, the temperature of the evaporator 4 will drop once and then rise to a high temperature. On the other hand, when a gas leak occurs, the temperature of the evaporator 4 does not decrease as shown by curve d. Therefore, as is clear from FIG. 2, the temperature of the evaporator 4 after a certain time τ ₀ after starting the compressor 2 is higher than the predetermined temperature t 0 during abnormal conditions (broken line), and higher than the predetermined temperature t ₀ during normal conditions (solid line). ), the temperature is below t ₀ . Here time τ ₀ is evaporator 4
This is the time required for the temperature of to show a stable tendency with respect to the temperature t ₀ . Therefore, normal and abnormal operation can be determined by using a thermistor 6 for temperature detection, a timer 8 for setting the time τ ₀ , and a comparator 7 for comparing the temperature of the evaporator 4 with the temperature t ₀ . I can do it. Now, when starting the air conditioner, when the power switch 10 is turned on, if the room temperature is high, the contact 11 of the room thermostat is on, so the compressor 1 is energized and the timer 8 is started at the same time. On the other hand, when the temperature detected by the thermistor 6 is higher than _t0 , the comparator 7 outputs an H signal.
The resistor R ₃ connected in series with the thermistor 6 and the resistors R ₁ and R ₂ that determine the reference voltage are preset to output the L level when the level is below t ₀ . Outputs a signal that goes to H level and later goes to L level. However, due to the action of the timer 8, the output of the comparator 7 is regulated by the AND gate 9 during the first τ ₀ time, and the output of the comparator 7 is regulated by the transistor T only after the lapse of τ ₀ time.
given to the base of _r . However, as is clear from Figure 2, during normal operation, the temperature of the evaporator 4 falls below _t0 after _τ0 hours, so the output of the AND gate 9 is at L level, and the transistor _Tr is not turned on. Therefore, the compressor 1 continues its operation. When the contact 11 of the room thermostat turns off as the room temperature drops, the compressor 1 stops operating and the timer 8 is reset. Therefore, even if the temperature of the evaporator 4 rises and the output of the comparator 7 becomes H level, the output of the timer 8 is at L level, so the output of AND gate 9 remains at L level. Next, even if the room temperature rises and the contact 11 of the room thermostat closes and the compressor 1 resumes operation, the operation continues as described above as long as it is normal.

On the other hand, when operating with the windows closed, even if the contact 11 of the room thermostat closes and the compressor 1 starts operating, the temperature of the evaporator 4 does not come down easily, so the comparator The output of No. 7 remains at H level. On the other hand, when the time τ ₀ has elapsed, the output of the timer 8 becomes H level, so the AND gate 9 outputs an H level, and the transistor T _r is turned on. As a result, relay R _y1 operates and closes its contacts, and in conjunction with this, relay R _y2 operates.

The operation of the relay R _y2 is self-maintained by its contacts, but as a result, the compressor 1 is de-energized to perform a protective operation, and the lamp 12 is energized to indicate abnormal operation.

This protection is achieved by the self-holding of relay R _y2 .
This continues until the power switch 10 is turned off, and resumption of operation up to that point is prohibited.

Note that even in the event of an accident such as a gas leak, the temperature of the evaporator 4 does not drop, so protection and display are performed in the same way as when operating with the windows closed.

By the way, when the operating temperature _t0 of the comparator 7 is the resistance value of the thermistor 6 at this temperature as _Rt0 , each resistance _R1 , _R2 , _R3 is calculated as _Rt0 × _R2 = _R1 × _R3 . It can be obtained by setting various values, and can be set arbitrarily depending on the characteristics of the air conditioner to which it is applied.

As described above, according to the present invention, an abnormality in window closing at the time of starting a window air conditioner can be detected purely electrically, without adding any mechanical parts such as a high-pressure cutter or pressure sensor, and protection against this can be provided. Compared to conventional protection devices, it is possible to detect abnormalities at a point when the pressure rise is small.
Furthermore, it is possible to protect against gas leaks, which has been difficult in the past.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram of a window type air conditioner according to an embodiment of the present invention, Fig. 2 is a characteristic diagram explaining the operation of Fig. 1, and Fig. 3 shows the operation of each part of the configuration of Fig. 1. This is a time chart. 1... Compressor, 2... Capacitor, 4...
...Evaporator, 6...Thermistor, 7...Comparator, 8...Timer, R _y1 , R _y2 ...Relay.

Claims (1)

[Claim for Utility Model Registration] In a window-type air conditioner arranged so that a window that can be opened and closed is located on the back of a condenser, a temperature detector for detecting the temperature of an evaporator;
Starts time-limited operation at the same time as the compressor starts,
A timer that times out after the time when the temperature of the evaporator should stabilize during normal operation compares the temperature detected by the temperature detector with a preset reference value, and determines that the detected temperature is equal to the set reference value. a comparator that outputs an operating output when the time-up signal of the timer exceeds the operating output; a logic circuit that outputs an AND signal of the time-up signal of the timer and the operating output of the comparator; and a logic circuit that stops the compressor based on the output signal of the logic circuit. A window-type air conditioner characterized by being equipped with a protection circuit.