KR920000664Y1 - Automatic opening & closing apparatus of duct for prohibiting of engine overheating - Google Patents

Abstract

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Description

Duct automatic switchgear for preventing engine overheat

1 is a view showing the circuit configuration of the automatic shut-off switch for overheating engine according to the present invention.

Figure 2a is a view for explaining the case of applying the engine overheating duct automatic opening and closing device for construction equipment according to the present invention.

Figure 2b is a view for expanding the main structure of the duct automatic opening and closing device for preventing engine overheating according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: reference temperature potential setting part 2: temperature detection part

3: comparison unit 4: bias setting unit

5: drive signal output part 6: duct control drive part

[Industrial use]

The present invention relates to a duct automatic switchgear for preventing engine overheating, and more particularly, to a duct automatic switchgear for preventing overheating of an engine, which can increase the efficiency of the engine by controlling an opening and closing device of the duct according to a temperature sensed during operation of the engine. .

[Traditional Technology and Problems]

Background Art [0002] Conventionally, in the apparatus which uses the rotational force of the engine as a driving source, since the temperature generated during operation of the engine causes the weak heat resistance equipment or the characteristics of components to be deteriorated or destroyed, the engine is prevented from overheating. Various methods have been taken. Among them, a method of preventing the engine from overheating is formed by forming an air duct structure for the air inlet / outlet in which a plurality of blades are arranged at regular intervals in the frame of the site where the engine is mounted. have.

However, in this method, since the blade is always open, the engine is cooled by air irrespective of the ambient temperature. For example, when the ambient temperature is low, the engine efficiency is lowered. Since the noise generated during operation of the engine is propagated from the duct to the outside, it is possible to feel an auditory obstacle, etc., and there is a drawback that the size of the duct design is limited.

[Purpose of designation]

The present invention has been made to solve the above-mentioned drawback, the engine overheating prevention that can increase the efficiency of the engine by automatically opening and closing the duct by the small motor according to the engine temperature detected by the sensor for sensing the engine temperature The purpose is to provide an automatic duct opening and closing device.

[Composition of design]

In order to achieve the above object, the duct automatic switching device for preventing overheating of an engine according to the present invention includes a resistor connected in series between a power source and a ground, a variable resistance for variable reference potential, and a variable resistance for variable resistance between the resistor and the reference potential. A reference temperature potential setting unit composed of a zener diode and a condenser connected to the reverse direction, a dummyster for sensing an engine temperature, a temperature sensing unit consisting of a storage and a capacitor, and an output signal of the reference temperature potential setting unit and the temperature sensing unit A comparator for comparing the negative output signal, a comparator comprising a resistor and a capacitor, a transistor, a resistor, a zener diode and a bias setter for supplying operating power to the comparator, a resistor, a diode, a capacitor and A driving signal output unit and a motor configured to include a driving transistor for outputting a duct opening driving signal according to the output signal of the comparing unit; Ray and, consists of a change-over switch is characterized in that the duct is configured to control the driving unit for the control rotation direction of the motor is controlled to open and close the duct by the output signal of the output drive signal.

[Action]

According to the duct automatic opening and closing device for preventing overheating of the engine according to the present invention configured as described above, the efficiency of the engine is increased because the duct is opened by controlling the rotation direction of the motor only when the temperature of the engine is sensed.

EXAMPLE

Hereinafter, with reference to the drawings will be described in detail with respect to the engine overheating duct automatic closing device according to the present invention.

1 is a view showing the circuit configuration of the automatic overheating duct opening and closing device for engine overheating according to the present invention, formed by a variable resistor (VR1) and zener diode (ZD1) for varying the resistance (Rl, R2) and the reference temperature The reference potential signal to be applied is once charged in the capacitor C1, and when the charging of the capacitor C1 is completed, it is applied to one input terminal of the comparator OP1 provided in the comparator 3 as the reference temperature potential setting signal. At this time, the temperature generated during operation of the engine (not shown) is sensed by the dummyster TH1 at the other input terminal of the comparator OP1 and is input as the temperature signal of the engine. Accordingly, the comparator OP1 compares the reference temperature potential setting signal with the temperature signal of the engine and outputs a high level signal when the engine temperature signal is higher than the reference temperature potential setting signal, while the low level signal is low. Will print Here, the comparator OP1 receives the output signal of the transistor TR1 whose base bias is set by the resistor R7 and the zener diode ZD2 and sets the operation bias to perform the comparison operation.

Subsequently, the output of the comparator OP1 is applied to the driving transistor TR2 via the capacitor C3 and the diode D2 of the resistor R5. In this case, the driving transistor TR2 is the comparator ( It is turned on only when the output of OP1 is high level, and the high level output while the transistor TR2 is turned on is applied to the duct control driver 6.

Here, the relay RY1 and the changeover switch SW1 provided in the duct control driver 6 are in reverse switching interlocking operation, and the common connector COM of the relay RY1 is normally connected to the ground terminal NC. Is connected to the power supply B side terminal NC of the common connector COM of the changeover switch SW1, and the operating voltage of the power supply B is applied to the motor M. Since the motor (M) is rotated in the forward direction, for example, to maintain the duct (DT) in a closed state as will be described later.

In this state, when the driving transistor TR2 is turned on by a high level signal corresponding to overheating of the engine output from the comparator OP1, the emitter output of the transistor TR2 is set to the relay RY1. Since the coil CL1 is magnetized since it is applied to the coil CL1, the common connector COM of the relay RY1 is switched to the output side of the transistor TR2, that is, the power supply B side terminal NO. When the common connector COM of the selector switch SW1 is switched to the ground terminal NO, the motor M is rotated in reverse to open the duct DT as described later.

Next, the structure and opening / closing operation of the duct will be described with reference to FIGS. 2A and 2B.

First, Figure 2a is a view for explaining the form in which the duct (DT) is installed in the frame near the engine room applied to the engine overheating prevention duct automatic opening and closing device according to the present invention, Figure 2b is the engine overheating prevention duct automatic It is an enlarged view showing the main structure of the switchgear. As shown in FIG. 2a, a part of the engine compartment frame of the heavy equipment is cut and then arranged at regular intervals on the connecting axis AX, which is vertically movable, as shown in FIG. 2b. By forming a duct structure in which a plurality of blades BL, which are opened and closed, are controlled according to the rotation of the fixed drive pulley FL, the duct can be automatically opened and closed according to the engine temperature.

Here, the main structure of the duct shown in FIG. 2B will be described in more detail. When the motor M provided in the duct control driving unit 6 of FIG. 1 rotates forward, for example, Since the driving pulley FL mounted on the rotation shaft HR rotates in the direction of arrow “b”, the connecting shaft AX suspended on the belt BT is moved upward, and thus all the blades BL are closed. When the driving transistor TR2 of FIG. 1 is turned on because the engine temperature is high, the rotation direction of the motor M is switched as the coil CL1 of the relay RRY is magnetized. Accordingly, since the driving pulley FL rotates in the direction of the arrow “a”, the belt BT of the connecting shaft AX becomes long, so that the blade BL moves as the connecting shaft Ax moves vertically downward. To open the engine compartment All.

[Effect of design]

As described above, according to the engine overheating prevention opening and closing device for preventing overheating according to the present invention, it is possible to improve the efficiency of the engine because it automatically opens and closes the duct only when it senses the temperature of the engine and is determined to be above a predetermined value. In addition, the restrictions on the shape (dimensions) of the duct structure can be relaxed, so that the efficiency of use of the entire apparatus using the rotational force of the engine as a driving source can be improved.

Claims (1)

Reverse direction between the resistors Rl and R2 connected in series between the power supply B and the ground, the variable resistance VR1 for reference potential variable, the resistors Rl and R2, and the variable resistance VR1 for reference reference variable variable. A reference temperature potential setting section 1 composed of a connected zener diode ZD1 and a condenser C1, a dummyster TH1 for sensing an engine temperature, a resistor R3, and a condenser C2 With a comparator (OP1), a resistor (R4), and a capacitor (C4) for comparing the output signal of the temperature sensing unit (2), the reference temperature potential setting unit (1) and the output signal of the temperature sensing unit (2) Comprising a comparator 3, a transistor (TR1), a resistor (R7), a zener diode (ZD2), and a capacitor (C5) configured to supply an operating power to the comparator (OP1) 4, A drive signal output section comprising a resistor (R5, R6), a diode (D2), a capacitor (C3), and a drive transistor (TR2) to output a duct opening drive signal in accordance with the output signal of the comparison section (3). (5) And a motor (M), a relay (R1), and a switching switch (SW1), the rotation direction of the motor (M) is controlled by the output signal of the drive signal output unit (5) to open and close the duct (DT). Duct automatic opening and closing device for preventing the engine overheating, characterized in that consisting of a duct control driving unit for controlling (6).