KR970007227B1 - Air-circulation control circuit - Google Patents

Abstract

A pollution deciding part(14) compares a standard voltage(3v) and the signal output by a differential amplifier(13B). If the signal is higher than the standard, the pollution deciding part(14) outputs the wave indicating the pollution. At this time, high potential is provided from a comparator(CP1) to the base of a transistor(Q3), and a pollution indicating luminous diode(LED3) is lighted up, indicating the state of deep pollution. And from the comparator(CP3) high potential is output, and by this high potential is output from NAND gate. So a transistor(Q5) is turned on, driving a relay(RY3), and the polluted air in a cage can be cleared up.

Description

Elevator air circulation control circuit

1 is a diagram of an air ventilation circuit of a general elevator.

2 is a schematic view of a cage showing the application of the present invention.

3 is an air circulation control block diagram of the elevator of the present invention.

4 is a detailed circuit diagram of FIG.

5 is a forward / reverse control circuit diagram of a fan motor.

6 is an explanatory diagram of contamination detection according to the present invention.

(A)-(g) of FIG. 7 is a waveform diagram of each part of FIG.

(A) of FIG. 8 is a reverse rotation waveform diagram of the fan,

(b) is a driving timing diagram of the air cleaner;

(c) is a forward / reverse rotation timing diagram of the fan by the timer.

* Explanation of symbols for main parts of the drawings

11 contamination detection unit 12 light emitting unit

13 detection signal amplification unit 14 contamination determination unit

15: pollution indicator 16: reference signal generator

17: integrator 18: drive control signal generator

19: fan motor drive unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for circulating air in an elevator, and more particularly, to an air circulation control circuit of an elevator adapted to circulate air in a cage through a fan motor by checking the amount of cigarette smoke or dust present in the air in the cage. .

In a general elevator, the fan motor is driven based on the waiting time. Referring to FIG. 1, the operation thereof will be described as follows.

When the elevator is running normally or not waiting on the floor for more than a predetermined time (for example, 3 minutes) after the service is completed, the programmable enable buffer B ₁ is in an off state and the relay RY ₁ is not driven. The switch RY ₁₁ of the relay RY _l is turned off so that the fan motor control relay RY ₂ is not driven. Accordingly, the b contact switch RY ₂₁ of the relay RY ₂ remains short-circuited. If the switch SW is turned on, the fan motor FM is driven.

However, when the elevator is waiting for three minutes or more, the programmable buffer B ₁ is short-circuited by software processing, whereby the relay RY ₁ is driven so that the fan motor control relay RY ₂ is operated. Since the b contact switch RY ₂₁ of the relay RY ₂ remains open, the fan motor FM is not driven.

As described above, in the conventional elevator, the fan motor is rotated in one direction based on the waiting time. At this time, the air is mainly circulated only in the cage, thereby preventing the air in the cage from being circulated more efficiently.

In order to solve the above problems, the present invention is to check the amount of cigarette smoke or dust present in the air in the cage, and based on this, the fan motor can be rotated in the forward or reverse direction to ventilate the air in the cage. It demonstrates in detail by one figure.

2 is a view illustrating an installation portion of a fan motor according to the present invention. As shown in FIG. 2, a light emitting diode (LED _l ) and a light receiving diode (LED ₂ ) are installed on left and right sides of an upper side of a cage 1, and a cage ( Fans 2a and 2b were provided on the left and right sides of the upper outer side of 1).

3 is an air circulation control block diagram of the elevator according to the present invention. A light emitting unit 12 for emitting light used for detecting the degree of contamination at 11, a detection signal amplifying unit 13 for amplifying the detection signal output from the particulate detection unit 1 to a level suitable for processing; By comparing the output signal of the detection signal amplifying unit 13 with a reference signal and outputting a contamination determination signal corresponding thereto, and comparing the output signal of the contamination determination unit 14 with a reference signal. A contamination display unit 15 for displaying the presence or absence of contamination, a reference signal generator 16 for generating a reference signal used in the contamination determination unit 14 and the contamination display unit 15, and the contamination determination unit 14 To integrate the output signal of An integrator 17 and a drive control signal generator 18 for comparing the output signal of the integrator l7 with a reference signal and outputting a fan motor drive signal accordingly; and an output signal of the drive signal generator 18 According to the fan motor drive unit 19 for driving the fan motor FM in the forward or reverse direction according to the present invention, the operation and effect of the present invention configured as described above will be described with reference to FIGS. .

Since the transistor Q ₁ is turned on and off by the signal output from the unstable multivibrator MV as shown in FIG. 7 (a), the voltage supplied to the base side of the transistor Q ₂ in the warming period is reddened. The collector voltage of the transistor Q ₂ appears as shown in FIG. 7B, and the light emitting diode LED ₁ is turned on in the low potential section of this voltage and turned off in the high potential section.

The optical signal generated from the light emitting diode (LED ₁₎ is irradiated to the light-receiving diode (LED _2), the light is irradiated to the light receiving diode (LED ₂₎ according to the density of the density or the smoke of dust existing in the cage (1) As the on-current of the light-emitting diode LED ₂ changes according to the degree and is contaminated with dust or smoke, the input voltage of the operational amplifier OP ₁ , that is, the level of the pollution detection signal increases. .

The weak contamination detection signal thus detected is amplified by the operational amplifier OP ₁ and the operational amplifier OP ₂ of the AC amplifier 13 and output in the form as shown in (c) of FIG. VR ₁ ) can be used to adjust the amplification factor of the operational amplifier OP ₂ .

The output signal of the AC amplifier 13a is again amplified by the automatic amplifier 13b and output as a signal of the form as shown in FIG. 7 (d). Here, assuming that the pollutant is tobacco smoke, T The waveform detected in _one cycle is an output waveform when the density of cigarette smoke is more than a predetermined value, and the waveform detected in the T ₂ cycle is an output waveform when the density of cigarette smoke is less than or equal to a predetermined value.

In addition, the pollution determination unit 14 compares the reference voltage Verf ₂ (3v) output from the reference signal generator 16 with the signal output from the differential amplifier 13b and compares it with the reference voltage Verf ₂ . As shown in (d) of FIG. 7, a waveform indicating that contamination has occurred is outputted, which is integrated and output as shown in (g) of FIG. 7 through the integrator 17.

At this time, the signal output from the differential amplifier unit (l3b) are compared with the comparator (CP ₁₎ the reference voltage (Verf ₃₎ (3.6V) at the transistor from the reference voltage (Verf ₃₎ is greater than the comparator (CP ₁₎ is a high potential supplied to the base of the axis (Q ₃₎ there is a lighting light emitting diode display for contamination (LED _3), a light emitting diode (LED ₃₎ is a light emitting diode to indicate that a lot of pollution.

At the same time, the comparator CP ₂ compares the signal output from the contamination determiner 14 with the reference voltage Verf ₄ (2V) and is at the base side of the transistor Q _{4 when it} is larger than the reference voltage Verf ₄ . by outputting a high potential there is a light emitting diode for contamination display (LED _4), a light emitting diode (LED ₄₎ is a light emitting diode to indicate that the level is relatively insignificant, but is contaminated.

Thus, once the light emitting diode (LED ₃₎ light present, would indicate that a lot of contamination, the light emitting diode (LED ₃₎ is if the lighting, only the light emitting diode (LED ₄₎ in the OFF state it is possible know that pollution is little .

On the other hand, a signal as shown in (g) of FIG. 7 which is detected in the period T ₁ and output from the integrator 17 is compared with the reference voltage Verf ₅ by the comparator CP ₃ , and thus is supplied to the non-inverting input terminal. In the section higher than the reference voltage Verf ₅ , the high potential is continuously output from the comparator CP ₃ , and the high potential is output from the NAND gate ND, thereby turning on the transistor Q ₅ . The motor control relay RY ₃ is driven.

Yiettara the relay (RY ₃₎ of a contact switch _{(RY 3a1), (BY 3a2} ) is short and, b-contact switch (RY _3al), is an opening (RY _3b2) the fan motor, as in the degree of claim 8 (a) The transistor Q ₅ and the relay RY ₃ are turned off from the time when the FM is rotated in the reverse direction and the polluted air in the cage 1 is discharged out and the low potential is output from the comparator CP ₃ . The a contact switches RY _3a1 and RY _3a2 of the relay RY ₃ are opened, and the b contact switches RY _3a1 and RY _3a2 are shorted, and the fan motor FM is rotated in the forward direction to the outside. Clean air flows into the cage (1).

At this time, as shown in (b) of FIG. 8, when the relay RY ₃ is turned on and the switch RY _3a3 of the relay RY ₃ is shorted, the timer T delays it for a predetermined time Tα therefrom. After a while, the air cleaner 21 is driven just before the fan motor FM is rotated in the forward direction to purify the contaminated air remaining in the cage 1.

As described in detail above, the present invention uses the light emitting device and the light receiving device to check the amount of cigarette smoke or dust present in the air in the cage, and based on this, rotates the fan motor in the forward or reverse direction and drives the air purifier in the cage. It is effective to ventilate the air more efficiently.

Claims (5)

The contamination detector 11 detects the degree of contamination by using the light transmittance according to the amount of impurity fine particles such as dust or smoke, and the light emitting unit 12 that emits light used to detect the degree of contamination by the contamination detector 11. ), A detection signal amplifier 13 for amplifying the detection signal output from the contamination detector 11 to a level suitable for processing, and an output signal of the detection signal amplifier 13 compared with a reference signal. A pollution determination unit 14 for outputting a pollution determination signal according to the present invention, a contamination display unit 15 for displaying the presence or absence of contamination by comparing the output signal of the pollution determination unit 14 with a reference signal, and the contamination determination unit 14 A pollution display unit 15 displaying the presence or absence of contamination by comparing the output signal of the reference signal to a reference signal, and a reference signal generator 16 generating a reference signal used in the pollution determination unit 14 and the pollution display unit 15. ) And the output signal of the pollution determination unit 14 An integrator 17 for integrating the signal, a drive control signal generator 18 for comparing the output signal of the integrator 17 with a reference signal, and outputting a fan motor drive signal accordingly; and the drive signal generator 18 Elevator air circulation control circuit comprising a fan motor driving unit (19) for driving the fan motor (FM) in the forward direction or the reverse direction in accordance with the output signal. The contamination detector 11 of claim 1, wherein the contamination detector 11 connects the power supply terminal Vcc to the ground capacitor C ₃ through the resistor R ₁ , and connects its connection point to the operational amplifier OP ₁ through the resistor R ₂ . And the connection point is connected to a grounding resistor (R ₃ ) through a light receiving diode (LED ₂ ). The method of claim 1, wherein the light emitting unit 12 is the collector of connecting the output end of the non-stable multivibrator (MV) on the base side of the transfected group requester (Q _1), and the transistor (Q ₁₎ a diode (D ₁₎ Connect the grounding capacitor (C ₆ ) through this connection point to the base side of transistor (Q ₂ ) where the emitter is grounded, and connect the power supply terminal (Vcc) to light emitting diode (LED ₁ ) and resistor (R ₉ ). An air circulation control circuit for an elevator, characterized in that configured to connect to the collet of the transistor (Q ₂ ) through. The driving control signal generator 18 connects the output terminal of the integrator 17 to the variable resistor VR ₃ having one side grounded through the resistor R ₂₇ , and connects the connection point to the inverting input terminal. Connect the non-inverting input terminal of the comparator CP _{3 to} which the reference voltage Vref ₅ is supplied, and connect the power supply terminal P ₅ to the output terminal of the comparator CP ₃ through the resistor R ₃₀ , and the ground capacitor ( C ₁₃ ) and the other input terminal of the NAND gate ND to which the power supply terminal voltage P ₅ is supplied to one input terminal, and the output terminal thereof is connected to the bait of the transistor Q ₅ , and then the power supply terminal Vcc. Is connected to a collector of the transistor (Q ₅ ) via a fan motor control relay (RY ₃ ). The fan motor driving part ( ₉ ) constructs a reverse rotation loop of the fan motor (FM) at the a contact number positions (RY _3a1 ) and (RY _3a2 ) of the fan motor control relay (RY ₃ ). b. An air circulation control circuit for an elevator comprising a forward rotation loop formed by contact switches RY _3a1 and RY _3a2 .