KR19990024735A - Range hoods that detect and automatically leak leaks - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a range hood, comprising: a housing having an air inlet and an air outlet; at least one blower installed in the housing; a drive motor installed in the housing to drive the blower; and an operation panel for operating the drive motor by a user's operation. And a power input unit for supplying power to the drive motor, the range hood comprising: a gas detection sensor for detecting gas, and a control unit for controlling the driving of the motor by detecting the gas from the gas detection sensor; It is characterized in that, when the gas leaks automatically operates to discharge the leaked gas to the outside, it is notified by a warning light and a warning sound has the effect of preventing the fire or explosion accident due to the gas leak in advance.

Description

Range hoods that detect and automatically leak leaks

The present invention relates to a range hood having an additional function of discharging gas to the outside by operating a blower by a gas detection sensor in order to prevent a gas leakage accident.

Recently, the use of gas ranges using city gas or liquefied petroleum gas (LPG) has become common. As a basic component for eating, it has become an indispensable instrument in kitchen facilities such as homes and restaurants.

By the way, when cooking or using a separate gas cooker, heat, smoke, smell, etc. are generated. Since the gas stove is usually used indoors, it is discharged to the outside to maintain a pleasant environment. Although ventilators are installed to exhaust indoor air to the outside, a range hood is currently installed at the top of the gas range for more efficient discharge. As soon as heat, smoke and odors are generated from the use of the gas range, it is sucked from the top of the range and discharged to the outside.

On the other hand, if you use a gas range to prepare for gas leakage. Leakage of city gas or propane gas can cause catastrophic accidents due to the explosive nature of the gas itself. Therefore, in the case of the gas range which uses a normal gas, in order to prevent the leakage of a gas, when the gas range light is turned off, the safety device which stops gas supply automatically is provided. Nevertheless, accidents due to gas leaks are constantly occurring. The use of a gas range may cause gas leakage because the cook may overflow or the lights may go out during operation of the gas range, and aging of the gas range or abnormalities in the connection between the gas range and the gas cylinder may occur. It is.

Of course, if people are in a state where they can perceive gas leakage, this is not a problem. In some places where gas is handled, a gas detector may be installed to inform people of the leak through a beep, but the need for a more effective means of solving the leak is increasing.

Therefore, an object of the present invention is to prevent the occurrence of a fire or explosion accident by automatically detecting the gas leakage and discharging the leaked gas to the outdoors even if a person can not watch in a residential facility using a gas range. The purpose is to provide a range hood.

1 is an assembled perspective view showing an embodiment of a range hood according to the present invention;

2 is a circuit diagram of a control unit of a range hood according to the present invention;

3 is a circuit diagram of an off delay timer of a range hood according to the present invention;

4 is a block diagram for explaining the operation of the range hood according to the present invention;

5 is an operational state diagram of a range hood according to the present invention;

Figure 6 is a structural diagram showing a state in which the control unit and the blocking device of the range hood according to the present invention.

Explanation of symbols for the main parts of the drawings

10: range hood 11: housing

12: upper panel 13: lower panel

14 gas inlet 15 gas outlet

16 gas discharge pipe 21 drive motor

22: blower 23: fixed body

30 control unit 34 operation panel

35: operation switch 36: operation plate

37: power light 38: warning light

39: buzzer 40: gas detection sensor

42: off delay timer 44: light switch

60: power 62: power switch

64: transformer 66: thermistor

70: Operational Amplifier

75: oscillation circuit 76,77,82: transistor

78; Buzzer 80,86: Light Emitting Device

84: relay

The present invention for achieving the above object is a housing having an air inlet and an air outlet, at least one blower installed in the housing, a drive motor installed in the housing to drive the blower, and for operating the drive motor by the user's operation A range hood comprising an operation panel, the range hood comprising: a gas detection sensor for detecting a gas, and a gas detection sensor further comprising a control unit for controlling the driving of the motor based on whether the gas is detected from the gas detection sensor. It is a range hood.

Hereinafter, a range hood according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an assembled perspective view showing an embodiment of a range hood according to the present invention.

Referring to FIG. 1, the range hood 10 according to the present invention has a structure 11, a housing 11, a blower 22, a driving motor 21, an operation panel 34, a gas detection sensor 40, and the like. The control unit 30 may be divided.

The housing 11 consists of an upper panel 12 in the form of a cover and a lower panel 13 coupled to the lower portion of the upper panel. The lower panel 13 has a gas inlet 14 through which gas is introduced, and the upper panel 12 has a gas outlet 15 through which gas is discharged. The gas outlet 15 is connected to the gas discharge pipe 16 is connected to the outdoor.

Inside the housing 11, a blower 22 operated by the drive motor 21 is installed, and the operation panel 34 for operating the drive motor 21 by exposing the operation switch 35 to the outside of the housing. ) Is installed. Usually, one or two drive motors 21 are installed inside the housing 11. In the embodiment, one blower of which speed is controlled in two stages is fixed to the upper panel 12 by being coupled to one fixing body 23.

In addition, the housing 11 has a box-shaped control unit 30 electrically connected to the gas detection sensor 40 installed outside the housing 11 to drive the driving motor 21 when gas is detected by the gas detection sensor 40. Is installed inside).

In addition, the operating plate 36 is exposed to the outside of the housing by a warning light 38 and a power light 37 indicating the operating state of the buzzer 39 and the gas detection sensor 40 to inform when the gas leaks. It is installed.

The connection between the operation panel 34 and the drive motor 21, the electrical connection between the gas detection sensor 40 and the drive motor 21, and the power supply are made in the controller 30 so that the wiring is not complicated. The control unit 30 has the following circuit configuration.

2 is a circuit diagram of a controller of a range hood according to the present invention, with reference to this will be described the circuit configuration of the controller.

The power supply switch 62 from the power supply 60 and the transformer 64 are connected. The voltage supplied to the transformer 64 through the power switching switch 62 may be adjusted. And the light emitting element LED280 which is a power lamp which shows whether the power supply voltage flows from the transformer 64 is connected. When the voltage is applied, the light emitting device LED2 80 is turned on.

The transformer 64 is connected to the temperature compensation element 66 and to the gas detection sensor 40. The temperature compensating element 66 prevents an increase in resistance due to a temperature rise in the circuit when a voltage is applied to the circuit and current flows. The gas detection sensor 40 increases the voltage by increasing the resistance value when gas is detected.

An OP amplifier 70 is connected to a voltage at which the supply voltage from the transformer 64 is changed by the gas detection sensor 40 to -input. Here, the OP amplifier 70 compares the values of the -input side and the + input side as a comparator so that a current flows to the output side when the + input is higher than the -input. At this time, by adjusting the circuit with the OP amplifier 70 can be output only when the + input is more than a certain degree, the output of the OP amplifier 70 is determined to be smaller than that in consideration of the explosion lower limit value for the gas used. The output side of the OP amplifier 70 is connected to the transistor Q3 82 via a circuit composed of NAND gates 71 and 72, and the transistor Q3 82 is connected to the relay 84. In addition, the output of the OP amplifier 70 is connected to the basic oscillation circuit 75 composed of NAND gates 73 and 74 and connected to the buzzer 78 through the transistors Q2 76 and Q1 77. It is also connected to LED1 86 which is a warning lamp via transistor Q2 76.

The voltage from the transformer 64 is supplied to the negative input side of the OP amplifier 70. When the gas detection sensor 40 detects gas, the resistance value is increased, and a voltage higher than the supply voltage from the transformer 64 is supplied to the + input side of the OP amplifier 70, and when no gas is detected, the transformer Supply voltage from 64 is input.

The OP amplifier 70 compares the voltage at the + input side with the voltage at the − input side, and when the voltage at the − input side is large, no current flows to the output side, but when the voltage at the + input side is large, the current flows to the output side. If no gas is detected, the voltage on the input side is higher and the output is turned off, i.e. zero. In other words, the circuit after the OP amplifier 70 is not conductive. When gas is detected by the gas sensor 40, the resistance value is increased so that the voltage entering the + input side of the OP amplifier is higher than the voltage at the − input side, resulting in an ON state, that is, a state of 1.

When the output from the OP amplifier 70 is 1, the output and the input from the transformer 64 are input to the NAND gate IC1 / A 71 via a predetermined circuit. Since the NAND gate IC1 / A 71 has an output of 1 from the OP amplifier 70 and a state of 1 from the transformer 64, the output of the NAND gate IC1 / A 71 becomes 0 and the NAND gate The output of the IC1 / B 72 becomes 1 so that a current flows through the circuit. As a result, current flows in the base of the transistor Q3 82, and the relay 84 operates. The drive motor can be operated through this relay 84.

The output from IC1 / B 72 again supplies current to the base of transistor Q2 75 via an oscillator circuit 75 consisting of NAND gate IC1 / C 73 and IC1 / D 74, As a result, current flows in the base of the transistor Q1 77. Therefore, the buzzer 78 is operated and LED1 86, which is a warning light, is turned on and blinks due to the influence of the oscillation circuit 75. While the gas detection sensor 68 is sensing, the buzzer 78 and the LED1 86 continue to operate and the relay 84 remains in that state.

Referring to Figure 1 will be described the operation of the range hood according to the present invention.

The range hood 10 according to the present invention having the structure as described above operates without difference from the ordinary range hood when no gas is detected by the gas detection sensor 40. That is, when the operation switch 35b is pressed, the driving motor 21 operates to operate the blower 22 to suck air from the gas inlet 14 and forcibly discharge it to the outside through the gas outlet 15. When the stop switch 35a is pressed, the drive motor 21 is stopped and the operation of the blower 22 is stopped.

If the gas leaks, the range hood 100 according to the present invention detects the gas by the gas detection sensor 40, and thus the driving motor 21 immediately operates without pressing the operation switch 35a. . At this time, the warning light 38 is turned on by the gas detection sensor 40 and the control unit 30 connected thereto, and the buzzer 39 rings. When the driving motor 21 is operated, the blower 22 is operated to discharge the gas from the indoor to the outdoor and stop after the gas is discharged.

However, since gas leakage may cause a large accident, it is necessary to operate the range hood 10 continuously to some extent even when gas is not detected once gas is detected. In addition, when gas is not frequently detected for an extremely short time, the operation and stop of the driving motor 21 are repeatedly performed within a short time to shorten the life of the instrument. Therefore, it is necessary to operate for some time once the driving motor 21 is operated. In particular, it is necessary to discharge residual gas to the outside as much as possible when clearing the gas leak alarm. Accordingly, an off delay timer is used.

3 is a circuit diagram of an off delay timer of a range hood according to the present invention. The off delay timer 42 has a momentary operation time-return function and has a circuit configuration as shown in FIG. From the voltage input terminal X to the transistor Tr1 93 via a zener diode 92, which in turn is connected to a transistor Tr2 94, which is connected to a relay 96 to switch 97 Drive it.

That is, when gas is detected by the control unit described above, the control unit causes power to be supplied to the off delay timer circuit, and when a driving voltage for driving the driving motor is applied to the input terminal X, the charge of the capacitor C 91 is zero. For this reason, the impedance becomes 0, and the capacitor | condenser C91 is charged. The base current flows through the transistor Tr1 93, and the Tr1 93 is turned ON. When the transistor Tr1 93 is turned ON, the collector current flows, so the voltage at the output terminal b of the Tr1 93 becomes 0 volt.

Since the output b of the transistor Tr1 93 is 0, the base current of the transistor Tr2 94 does not flow, so that the Tr2 94 is turned OFF to generate a voltage at the output terminal c of the Tr2 94. As a result, the terminal ⑧ and the terminal ⑥ of the relay 96 are connected. Since terminal ⑥ is connected to the drive motor, the drive motor is operated.

When the voltage supply to the power supply input terminal X is cut off, there is no current in the power supply, but the capacitor C 91 starts to discharge and the voltage V _C of the capacitor C 91 drops to the zener voltage E _Z of the zener diode 92. Since the current is supplied to the base of the transistor Tr1 93 until this time (this time is called the delay time T), the transistor Tr1 93 keeps the ON state. Delay time T is determined according to the capacity of the capacitor C (91), by adjusting this delay time T can be adjusted. Since the transistor Tr1 93 continues to be in an ON state, a collector current flows through the transistor Tr1 93 so that the voltage at the output terminal b becomes 0 volt and the output b becomes 0.

Since the output b of the transistor Tr1 93 is 0, no current flows in the base of the transistor Tr2 94 so that the Tr2 94 is turned off to generate a voltage at the output terminal c of the Tr2 94. Therefore, the terminal ⑧ and the terminal ⑥ of the relay 96 are continuously connected to operate the drive motor.

When the delay time T elapses, the discharge voltage of the capacitor C applied to the input terminal X decreases to the zener voltage E _Z of the zener diode, so the zener diode is not conducting and the base current 0 does not flow through the transistor Tr1 (93). Numeral 93 is turned off.

Since the transistor Tr1 93 is in the OFF state, a voltage of + E volts is generated at the output terminal b of the Tr1 93 so that a current flows in the base of the transistor Tr2 94 so that the Tr2 94 is turned ON.

Since the transistor Tr2 94 is in the ON state, the collector current flows to zero the output terminal c. At this time, the relay 96 is again connected to the terminal ⑧ and terminal ⑤.

4 is a schematic view for explaining the operation of the range hood according to the present invention, Figure 5 is an operating state diagram of the range hood according to the present invention.

4 and 5, the range hood having a gas detection sensor according to the present invention is an off delay timer 42 between the control unit 30 and the drive motor 21 to operate for a predetermined time when gas is detected. Is connected.

When connected to a power source, the range hood 10 turns on a power lamp 37 for informing the operation of the gas detection sensor 40.

If the light is turned off during use of the gas range 120 or the gas is leaked from the hose and the pipe and gas is detected by the gas detection sensor 40, the control unit 30 blinks the warning light 38 and the warning buzzer 39 ). Then, the output from the control unit 30 is connected to the terminal ⑧ and the terminal ⑥ of the off delay timer 42 to operate the drive motor 21. Even when the gas is discharged and gas is not sensed and supply of current through the control unit 30 is stopped, the connection of the terminal ⑧ and the terminal ⑥ is maintained until the delay time T elapses, and the driving motor 21 continues to operate. When the delay time T has elapsed, the terminal ⑧ and the terminal ⑤ of the off delay timer 42 are connected. In this state it performs the function of a conventional range hood. That is, when the operation switch 35b is connected, the drive motor 21 operates, and when the lighting switch 44 is connected, the light is turned on.

Here, the drive motor 21 is capable of adjusting the rotational speed in two stages, so that when the terminal ⑧ and the terminal ⑤ are connected in the off delay timer 42, that is, when no gas is detected, the operation switch ( When the 35 is connected, the drive motor 21 is operated at a low speed, and operates at high speed when the terminals ⑧ and ⑤ are connected, that is, when gas is detected.

In the range hood 10 according to the present invention, the gas detection sensor 40 may change the installation position according to the type of gas to be used. In other words, when using city gas lighter than air, it can be installed in a high place such as the ceiling, and when using LPG, it can be installed near the floor.

Range hood according to the present invention can be used a variety of gas detection sensors that can be used to detect the gas. For example, a semiconductor gas detection sensor using a principle of decreasing or increasing the resistance when gas comes into contact with a heated metal oxide, or detecting the increase in the resistance of platinum wires when the flammable gas is burned by a catalyst and the temperature rises. Contact combustion gas detection sensors may be used. Preferably, since the present invention is a range hood installed at the top of a gas range using city gas or LPG gas, it is preferable to use a gas detection sensor of this semiconductor type or a contact combustion type.

Figure 6 is a structural diagram showing a state in which the control unit and the blocking device of the range hood according to the present invention.

As shown in FIG. 6, the present invention may be connected to a blocking device controller 112 that controls a blocking device 110 that opens and closes a flow of gas, and when the gas is detected, the gas may be blocked and the range hood may be operated. . The blocking device can be driven by being connected to F and G at both ends of the relay in FIG. 2.

The range hood according to the present invention introduces the installation of a drive motor capable of adjusting the rotational speed in two stages in one blower as described in the above embodiment, but as shown in FIG. By installing two blowers 22 operated by the gas detection, the two blowers 22 may be operated such that both of them operate.

According to the range hood according to the present invention as described above, the gas is automatically operated when the gas leaks, and the leaked gas is discharged to the outside, and a warning light and a warning sound are notified to prevent fire or explosion accident due to the gas leak. There is an advantage.

Claims (10)

A housing having an air inlet and an air outlet, at least one blower installed in the housing, a drive motor installed in the housing to drive the blower, and an operation panel for operating the drive motor by a user's operation. The range hood of claim 1, wherein the range hood includes a gas detection sensor for detecting gas, and a control unit for automatically controlling the driving of the motor according to the presence or absence of the gas detected from the gas detection sensor. The range hood of claim 1, wherein the range hood further comprises a warning light indicating that gas is detected. The range hood of claim 1, wherein the range hood further comprises a buzzer indicating that a gas is detected. 2. The range hood of claim 1, wherein the control unit includes an off delay timer for instantaneous timed return. The range hood of claim 1, wherein the range hood further comprises a power indicator indicating an operating state of the gas detection sensor. The range hood of claim 1, wherein the controller is smaller than an explosion lower limit. The range hood of claim 1, wherein the control unit is connected to a blocking device that blocks gas supply and controls the blocking device. The range hood of claim 1, wherein the gas detection sensor is a semiconductor gas detection sensor. The range hood of claim 1, wherein the gas detection sensor is a gas detection sensor of a contact combustion method. 5. The range hood of claim 1 or 4, wherein the range hood determines a delay time T by adjusting a capacitor capacity of an off delay timer.