JP2553788B2 - Ventilation blower with safety device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation blower for automatically stopping operation when a person approaches the outer periphery of the ventilation blower during maintenance.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for preventing accidents caused by forgetting to turn off the power during maintenance of ventilation fans to improve safety.

In the conventional ventilation blower, when cleaning the inside of the ventilation blower or performing maintenance work, generally, as shown in FIG. 5, the ventilation blower 33 is provided with a motor 32 having blades 31 mounted therein. When a worker opens a power switch 34 built in the device or set on a wall surface of a building outside the device 33, the device 33 is opened.
By turning off the power supply from the power supply 35 to the device to stop the operation of the device 33, the safety of the worker during the cleaning and maintenance work is ensured.

[0004]

However, in the conventional method, the cleaning and maintenance worker needs to turn off the power source 35 by himself, which makes the work complicated and the worker needs to turn on the power source 35.
If the work of cutting off is intentionally or unintentionally neglected, there is a problem that it becomes a dangerous state for cleaning and maintenance work such as rotation of the motor 32 inside the ventilation fan 33 and the blades 31.

The present invention solves the above-mentioned problems, and enables the operator to stop the operation of the ventilation blower without cleaning the inside of the ventilation blower without turning off the power of the apparatus. , It is an object of the present invention to provide a ventilation blower with a safety device that can ensure the safety of workers during work.

[0006]

In order to achieve the above object, a ventilation fan with a safety device of the present invention is provided with a motor and blades provided inside a hollow outer shell forming an air passage, and outside the outer shell. Infrared pyroelectric type human body detection set to generate a detection signal by detecting a human body approaching the louver inside the outer shell that contacts the louver A sensor control unit is provided, and a motor control unit that controls the operation of the motor by determining whether or not to energize the motor by inputting a detection signal generated when the human body detection sensor unit detects a human body is provided.

[0007]

According to the present invention, when the worker approaches the ventilation and air blower, the human body detecting sensor unit incorporated in the device detects the worker through the lattice-shaped openings of the louver and outputs a detection signal. When the motor control unit generates the detection signal, the motor control unit cuts off the power supply from the power source to the motor and automatically stops the rotation of the blade.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes an inner hollow outer shell which constitutes a main body air passage of the present apparatus. The inner hollow outer shell contains a motor 2 for generating power and blades 3 connected to the motor 2, and is provided outside the outer shell 1. A louver 4 that is removable from the outer shell 1 is attached to one end to form an air inlet having a lattice-like opening and to cover the blade 3 built in the outer shell 1. A human body detection sensor unit 5 that detects a human body approaching the apparatus through the opening of the louver 4 and generates a detection signal by detecting the human body is provided at a position of the opening in the outer shell 1 that is in contact with the louver 4. Further, the motor control unit 6 that disconnects the power supply to the motor 2 by using a detection signal generated when the human body detection sensor unit 5 connected to the human body detection sensor unit 5 detects a human body as an input.
Has a built-in.

Further, a power source 7 for supplying electric power to this apparatus,
A power switch 8 for turning on / off the power supply from the power source 7 to the device built in the outer shell 1 or provided outside the outer shell 1 is provided. With the above configuration, when the power switch 8 is closed and the power is supplied from the power source 7 and the human body is not approaching the apparatus, the human body detection sensor unit 5 incorporated in the outer shell 1 does not generate a detection signal. First, the motor control unit 6 connected to the human body detection sensor unit 5 does not cut off the power supply from the power supply 7 to the motor, the motor 2 is operated, the blades 3 connected to the motor 2 rotate, and the apparatus operates. It becomes a state. Further, when a human body approaches the apparatus, the human body detection sensor unit 5 detects the human body through the lattice-shaped openings of the louver 4 attached to the outer shell 1 and generates a detection signal. The power supply from the power supply 7 to 2 is cut off, the motor 2 is not operated,
The apparatus is stopped by stopping the blades 3 connected to the motor 2.

Next, the structure of the human body detection sensor unit 5 will be described with reference to FIG. As shown in the figure, the infrared sensor 9 used here is a pyroelectric type sensor and generates a voltage signal when the amount of heat incident on the sensor (in the state of far infrared rays) changes. Therefore, when the human body is detected, the body temperature generated by the human body causes a change in the spatial heat quantity due to the movement of the human body, and the human body is detected as the change in the spatial heat quantity. Further, the sensor cover 10 functions as a protective material for the infrared sensor 9 and a filter that controls the incident amount of the infrared light incident on the infrared sensor 9 and suppresses the detectable range of the human body from the infrared sensor 9. The ability of the cover 10 as a filter is adjusted by its material and thickness.
Reference numeral 11 is a case in which the structure of the human body detection sensor unit 5 is maintained. With the above configuration, the infrared sensor 9 in the case 11
Detects the human body as a change in the amount of incident infrared rays suppressed through the sensor cover 10. Therefore, the material, thickness, etc. of the sensor cover 10 are adjusted so that only the human body approaching the human body detection sensor unit 5 can be detected. It is what

Next, details of human body detection will be described with reference to FIG. The infrared sensor 9 built in the human body detection sensor unit 5 detects a change in the amount of heat as described above, and thus the detection ability of the human body with little movement is lowered.
Therefore, in the case of this device, the lattice-shaped openings of the louver 4 are used to improve the detection characteristics of the human body, and the method will be described below. As shown in the figure, 12 (A, B, C) are lattice-shaped openings of the louver 4. Reference numeral 13 is a human body to be detected, and 14 (A, B, C) is a light flux of infrared rays generated as a body temperature from the human body 13 at the time of incidence through each opening 12 (A, B, C) of the louver 4. . When the human body 13 moves in the direction of the arrow 15, infrared rays generated by the human body 13 are blocked by the louver 4 and the openings 12 (A,
(B, C) only reaches the infrared sensor 9 in the human body detection sensor unit 5 as a light beam 14 (A, B, C), and the light beam 14 incident on the infrared sensor 9 moves in the direction of the arrow 16 and reaches the infrared sensor 9. The incident infrared rays will change greatly in synchronization with the movement of the human body 13. Therefore, the detection characteristic of the human body 13 having little movement is improved.

Next, the circuit configuration of the human body detection sensor unit 5 and the motor control unit 6 will be described with reference to FIG. The voltage output when the human body 13 of the infrared sensor 9 incorporated in the human body detection sensor unit 5 is detected is generally very weak, and therefore the amplifier 17 amplifies it to a required voltage value. The amplified voltage output of the infrared sensor 9 is compared with a reference voltage value by a comparator 18 in order to separate a noise component and a detection signal by human body detection. The voltage signal larger than the reference voltage value is the comparator 1
It is determined that the human body 13 is detected only when the value is input to 8. In the case of this circuit configuration, when the human body 13 is detected, the comparator 18 outputs a pulsed hi voltage (0 V is output when not detected). This hi voltage output is input to the motor control unit 6 as a detection signal of the human body detection sensor unit 5. Then, the detection signal input to the motor control unit 6 becomes a voltage signal delayed by a certain time by the delay circuit including the transistor 19, the transistor 20, and the capacitor 21.
That is, when the detection signal is not input, the transistor 19 is in the off state, the capacitor 21 is in the charged state, and the transistor 20 is in the on state, and the transistor 19 is turned on by the input of the detection signal. The voltage charged in the capacitor 21 is discharged, and the voltage of the capacitor 21 is delayed from the time when the detection signal ends to the cutoff voltage between the base and the emitter of the transistor 20 or more. Is turned off. Here, the delay time of the detection signal is set by the cleaning and maintenance workers, and the human body detection sensor unit 5 is set by the worker during the cleaning and maintenance work.
That is, from the relationship between the generation intervals of the detection signals generated by detecting the human body 13, the time during which the motor 2 is never operated during the work is experimentally obtained and set in advance. Next, the normally-off type relay 22 connected to the transistor 20 and inserted in the line between the power supply 7 and the motor 2 is opened while the transistor 20 is off. Therefore, the power supply from the power supply 7 is cut off from the motor 2 to stop the motor 2. Further, since the transistor 20 is in the ON state during normal energization, the relay 22 is in the closed state, so that the motor 2 is operated by transmitting the electric power from the power source 7 to the motor 2, and thus the human body detection is performed. The operation of the motor 2 is stopped only during the delay time from the time when the sensor unit 5 detects the human body 13 and generates the detection signal to prevent the operation of the present apparatus.

As described above, according to the above configuration, when a cleaning or maintenance worker approaches the device during energization and operation to a certain distance, the human body detection sensor unit 5 in the outer casing 1 of the device is provided with the opening of the louver 4. The human body 13 is detected from 12 and a detection signal is generated. By the generation of the detection signal, the relay 22 in the motor control unit 6 connected to the human body detection sensor unit 5 detects the human body 13 by the human body detection sensor unit 5 and detects the detection signal. Is released for a delay time from the time when the noise occurs, the electric power from the power supply 7 is cut off from the motor 2, and the motor 2 is stopped. Further, since the human body detection sensor unit 5 continues to output a detection signal while the cleaning and maintenance worker continues the work, the open state of the relay 22 is extended, and after the work is finished, the cleaning and maintenance worker detects the human body from this device. The operation of the present device is prevented from the time when the sensor unit 5 is separated to a distance where the human body 13 cannot be detected until the delay time elapses, and the relay 22 is activated after the delay time elapses.
Is closed and the electric power from the power supply 7 is transmitted to the motor 2 to restart the operation of the motor 2. Therefore,
While the cleaning and maintenance workers are working, it is possible to automatically and safely prevent the operation of this device. It goes without saying that the human body detection sensor unit 5 and the motor control unit 6 can be integrated as one unit, and the function of the motor control unit 6 is a microcomputer, or CPU, ROM, RA.
It goes without saying that the function of the relay 22 can be realized by a semiconductor device such as a bidirectional thyristor, in addition to the one-chip microcomputer in which functions such as M and input / output are integrated. Further, it goes without saying that the detection signal of the human body detection sensor unit 5 is output to the outside of the apparatus and can be used for a warning of approach of a human body, control of the apparatus by an external device, and the like.

[0015]

As is apparent from the above-described embodiments, the present invention cleans the ventilation and air blower, and allows the maintenance worker to clean the ventilation fan.
When approaching to perform maintenance work, the human body detection sensor unit built in the outside of the device detects a worker and issues a detection signal, and the generation of this detection signal causes the motor control unit to receive power from the power supply to the motor. The power supply is turned off, the rotation of the blades is stopped, and the operation of this device is automatically prevented. Therefore, it is possible to provide a ventilation air blower with a safety device that can prevent operation automatically and safely while a cleaning and maintenance worker is working.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a ventilation fan with a safety device according to the present invention.

FIG. 2 is a partially cutaway side view showing a configuration of a human body detection sensor unit of the device.

FIG. 3 is an explanatory diagram illustrating a human body detection state of the device.

FIG. 4 is a circuit diagram of a human body detection sensor unit and a motor control unit of the device.

FIG. 5 is a block diagram of a conventional ventilation fan.

[Explanation of symbols]

 1 outer shell 2 motor 3 blade 4 louver 5 human body detection sensor unit 6 motor control unit

Claims (1)

(57) [Claims] 1. A motor and blade are provided in the outer hollow interior constituting the air passage, and a louver having a grid-like openings forming the inlet of the air provided in the outer, outer in contact with the louver It is equipped with an infrared pyroelectric type human body detection sensor unit that is set to detect a human body close to the outside and generate a detection signal, and input the detection signal generated when the human body detection sun unit detects a human body As a ventilation ventilation device with a safety device, which is provided with a motor control unit for determining the stop of energization of the motor and controlling the operation of the motor.