JPS5892743A - Blower controlling device of air-conditioner - Google Patents

Abstract

PURPOSE:To ensure the stable air-conditioning operation even in case of an adverse wind by constitution wherein the revolution of outside blower is checked and if it is not exceeding the specified change-over speed of a revolution controlling gear, said revolution of the blower may be accelerated up to a high speed. CONSTITUTION:During the normal operation, the output contact 11 of tachometer is closed not to actuate the comparator C1. However, in case of an adverse wind, the revolution of outside blower declines and if the revolution falles below the specified value, said output contact 11 is opened to actuate the comparator C1 charging the condenser CT1 through a resistor R7. Consequently the terminal voltage V2+ of the condenser CT1 is boosted to actuate the comparator CT2 after the time set by a timer T1 elapsed. Thus the coil 10a of the speed change- over relay 10 is turned ON through turning the transistor 12 ON to actuate the contact 10b accelerating the outside blower up to high speed revolution. Through these procedures, the stable air-conditioning operation may be ensured even in case of an adverse wind.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed control device for a blower in an air conditioner.

Since p'E, in this type of air conditioner, when the outdoor fan receives headwinds due to natural phenomena, its rotational speed decreases, and especially when it receives continuous headwinds such as seasonal winds such as winter. However, the refrigeration cycle becomes overloaded, causing the inconvenience that heating must be interrupted, and the capacity decreases even when cooling is still in progress.

The present invention was invented in view of this point, and when the rotational speed of the outdoor air blower decreases, the rotation of the air blower is forcibly switched to high speed. However, we provide an air conditioner that can reliably provide stable cooling and heating.

Hereinafter, the present invention will be explained with reference to the attached figure [f] showing one embodiment of the present invention.

First, the refrigeration cycle will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is an indoor heat exchanger, 3 is a pressure reducer, and 4 is an outdoor heat exchanger, and a refrigeration cycle is constructed by connecting these in a ring. Here, if necessary, a solid phase 141<4)j switching valve is provided,
It may also be possible to perform cooling and warming. 6 is an indoor side blower, 6 is an outdoor side blower, and both of these blowers @5. es is on the indoor side.

Each heat exchanger 2, 4 on the outdoor side is ventilated and cooled.

Next, the schematic structure of the electric circuit will be explained with reference to FIG. Here, the same numbers as those in FIG. 1 are given the same numbers, and the description thereof will be omitted.

In the figure, 7& is a power supply, 7 is an operation switch on the outdoor side, 8 is an operation switch on the indoor side, and 9 is a thermostand that switches between the normal speed side terminal 9a and the high speed side terminal 9b of the outdoor side blower (motor). , the operation is switched depending on the outside temperature. Reference numeral 10 denotes a speed switching relay, which operates a relay contact 10b via a relay coil 1o1 based on the output of a control device 1'4 that detects the rotational speed of the outdoor fan 6.

Next, the structure of the control device 14 will be explained with reference to FIG. Here, since the rotation speed detecting means may be a conventionally known mechanism, the explanation thereof will be omitted, and the circuit that performs the switching operation will be explained.

In the figure, reference numeral 11 is an output contact of a rotation speed detection device (not shown), and this contact 11 is opened when the rotation speed of the outdoor side blower becomes below a set value. C1 is a comparator that compares the reference voltage v2 (-)-) configured by resistors R1 and R2 and the input voltage v1 (→) set by resistors R3 and R4 connected in series to contact 11, and determines which of the two types of voltage. is output when there is a relationship of v1←)<vl assignment).

T1 means that the contact point 11 is connected for a predetermined time 1. The first timer outputs when the time is between the input voltage V2 (@) and the voltage of the CR charging circuit composed of the resistor R7 and the capacitor CT1 charged by the output of the comparator C1. 1), which turns on the transistor 12 via the resistor R8.
, OFF control.

Further, T2 is a second timer with a one-shot function that outputs immediately after the output of the first timer T1 and returns after a predetermined time t2, and is connected to the resistor R9 connected to the output terminal of the comparator C2. Rlo
The reference voltage v3 (→) is charged by the output voltage of the comparator c2, and the input voltage v3 (1) is the charging voltage of the resistor R11 and the capacitor CT2.
The input voltage Vl (-1) of the comparator c1 is controlled via the diode Dl.
1□ and '13 are resistors, D2 to D4 are diodes, 1
0b is a relay coil shown in FIG. 2, 10a is a relay contact shown in FIG. 2, and 13 is a DC power source.

In the above configuration, during normal operation, the output contact 11 of the rotation speed detection device (not shown) is closed, and the comparator CI) input voltage vl(→ becomes vl(→>Vt(+)), and the comparator C1 does not output. Therefore, the comparator C2 Relay coil 1 connected to transistor 12 without outputting
o& remains in the OFF state, and the speed switching relay contact 10b does not operate. Therefore, the outdoor fan 6 is in the state shown in FIG.

On the other hand, when the load on the outdoor side blower increases due to a headwind or the like and the rotation speed of the outdoor side blower 6 becomes less than a predetermined value, the rotation speed detection device is activated and the output contact 11 is opened. Then, when the output contact 11 is opened as shown by B in FIG.
1, the comparator L/-c1 outputs and charges the capacitor OT1 via the resistor R7. As a result, the voltage at the capacitor 0T1p terminal, that is, the input terminal v2 (g) of the comparator C2 increases, and after the set time tl of the first timer T1, the reference voltage v2 (→ < T2 (+1) is reached, and the comparator c2 outputs .

Therefore, the transistor 12 is turned ON, the relay coil 1oa is excited (ON), the speed switching relay contact 1ob is activated, and the speed terminal of the outdoor fan 6 is switched from the normal speed side terminal 9a to the high speed side terminal 9b. , C in Figure 4
As shown in the figure, by switching from low speed to high speed, it is possible to obtain a rotation speed above a predetermined value even in the case of a headwind.

In addition, the input voltage V g (+) of the comparator C3 is given a slight bias by the resistors R1□ and 13 and the diode D3, and is normally stable in the state of T3 (-1 < T3 (+), When the first timer T1 is activated, the reference voltage V3 (→) generated by the resistor R9 and RIO immediately increases to v3 (→> V 3 (-E), and the output of the comparator c3 is inverted, and the output of the comparator c3 is inverted, and the output of the comparator c3 is The input voltage v1 (→ is set to "L", so that the comparator cl does not invert even if the output contact 11 is closed, and the input voltage Vs ((1) is determined by v3 )>Vs(→
Hold for a period of . That is, by prohibiting the input of the comparator C1 with the output of the second timer T2, as shown by C in FIG. 4, the outdoor fan 6 is always operated at the high speed side during the set time 12 of the second timer T2. .

As shown by D in FIG. 4, if the outdoor fan recovers to 60 rotations within the set time 11 of the first timer T1 and the output contact 11 closes, the output of the comparator C1 is inverted and quickly discharges the charge in the capacitor CT1 via the diode D2.

Therefore, when the outdoor fan 6 in operation has stopped due to a decrease in rotational speed due to a head wind or the like, and the time has been longer than the first set time t1, the torque of the outdoor fan 6 during the second set time 12 is By increasing the speed and operating on the high speed side, overload of the refrigeration cycle is prevented,
And normal cooling capacity can be obtained.

In addition, if you use an air conditioner that can be used for both heating and cooling, you can continue warming up your body without feeling uncomfortable due to interruptions.

As is clear from the above embodiments, the air blower control device for an air conditioner according to the present invention includes a detector that detects the rotational speed of the outdoor blower, and a signal from the detector that generates a rotational speed control signal for the outdoor blower. the control device is provided with a speed switching set point, and when the rotational speed of the outdoor side blower decreases below the switching set point, the rotational speed of the outdoor side blower is switched to a high speed side to perform high-speed operation. Even if the rotation speed of the outdoor fan decreases due to headwinds, etc., there is no way to forcibly increase the rotation speed.
This solves the problem of overloading the refrigeration cycle due to a decrease in the air blowing capacity of the outdoor blower, resulting in a decrease in capacity.
Moreover, it is unavoidable that the installation location is prone to frequent headwinds.
It has various advantages, such as sufficient air conditioning capacity even when the air conditioner is closed, and the installation location is not limited.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram of an air conditioner, Fig. 2 is an electrical circuit diagram of an air conditioner equipped with a blow control device according to an embodiment of the present invention, and Fig. 3 is a blow control device for the air conditioner. FIG. 4 is a timing chart diagram explaining the speed control state in the air conditioner. 6...Outdoor side blower, 9&...Normal speed side terminal, 9b...High speed side terminal, 1o...
...Speed switching relay, 14...Control device. Name of agent: Patent attorney Masao Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A detector for detecting the rotational speed of the outdoor side blower, and a control device for outputting a rotational speed control signal for the outdoor side blower based on a signal from the detector, and a speed switching set point is provided in the control device. A blower control device for an air conditioner, the control device switching the rotational speed of the outdoor blower to a high speed side and operating it at high speed when the rotational speed of the outdoor blower falls below a speed switching set point.