JPH0579666A - Ventilating device with safety device - Google Patents

Abstract

PURPOSE:To obtain a ventilating device with a safety device capable of securing the safety of an operator during operation automatically by a method wherein the operation of the device can be stopped without disconnecting the power supply of the device by the operator upon the cleaning and/or maintenance operation of the inside of the ventilating device. CONSTITUTION:A ventilating device is constituted so as to accommodate a human body detecting sensor unit 5, detecting the approach of a human body to a position near a louber 4, constituting a ventilating passage and having a detachable lattice type opening, and utilizing a pyroelectric type infrared ray sensor generating a detecting signal by the detection of a human body, and a motor control unit 6, inputting the detecting signal of the sensor unit 5 and stopping the operation of the subject device by judging the stop of the operation of the subject device.

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 the operator opens the power switch 34 built in the device or set on the wall surface of the building outside the device 33, the device 33 is opened.
By turning off the power supply from the power source 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 / maintenance operator needs to turn off the power source 35 by himself, which makes the operation complicated and the operator 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 and the blades 31 inside the ventilation fan 33.

The present invention solves the above-mentioned problems, and enables the operator to stop the operation of the ventilation / blowing device without cleaning the inside of the device during the cleaning and maintenance work. , It is an object of the present invention to provide a ventilation fan with a safety device that can ensure the safety of workers during their work.

[0006]

In order to achieve the above-mentioned object, a ventilation fan with a safety device according to 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 louver with a lattice-shaped opening that forms the inlet of the air to be drawn 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 detection sensor unit incorporated in the device detects the worker through the lattice opening of the louver and outputs a detection signal. The motor control unit is turned off by the generation of this detection signal, and the rotation of the blades is automatically stopped by turning off the power supply from the power source to the motor.

[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 air passage of the apparatus, and which has a motor 2 for generating power therein and a blade 3 connected to the motor 2 therein, 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 configuration.

Further, a power source 7 for supplying electric power to the 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 power is supplied from the power source 7 and the human body is not approaching the apparatus, the human body detection sensor unit 5 built 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 source 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 is approaching 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. 2, the power supply from the power source 7 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. In addition, 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 range of distance of the human body from the infrared sensor 9 that can be detected. 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 configuration 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. Is what

Next, details of human body detection will be described with reference to FIG. The infrared sensor 9 incorporated 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 the present 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 by 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 flux 14 (A, B, C), and the light flux 14 incident on the infrared sensor 9 moves in the direction of the arrow 16 to the infrared sensor 9. The incident infrared rays will vary 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 built 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
Only when it is input to 8, it is determined that the human body 13 is detected. 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 for a certain fixed 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 emitter of the transistor 20 or more. Is turned off. Here, the setting of the delay time of the detection signal is the time required for the cleaning / maintenance worker to perform the work, and the human body detection sensor unit 5 is set to the worker during the cleaning / maintenance work.
That is, the time during which the motor 2 is never operated is experimentally obtained and preset from the relationship of the generation intervals of the detection signals generated by detecting the human body 13. 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, during normal energization, the transistor 20 is in the ON state and the relay 22 is in the closed state. Therefore, the electric power from the power source 7 is transmitted to the motor 2 so that the motor 2 is operated, 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 opened in 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 point of occurrence of, and the electric power from the power source 7 is cut off from the motor 2 to stop the motor 2. 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 this 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 after the delay time, and after the delay time, the relay 22 is closed and the electric power from the power supply 7 is transmitted to the motor 2. As a result, the motor 2 will be operated again. Therefore, it is possible to automatically and safely prevent the operation of the apparatus while the cleaning and maintenance worker is working. 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, RAM,
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 the functions such as 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 warning of approach of the 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, so that the maintenance worker can clean it.
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 cut 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 blower with a safety device, which can prevent operation automatically and safely while a cleaning and maintenance worker is working.

[Brief description of drawings]

FIG. 1 is a block 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)

[Claims] 1. A motor and blades provided inside a hollow outer shell forming an air passage, a louver provided in the outer shell and having a lattice-like opening for forming an air inlet, and an outer shell celsius with the louver. It is equipped with an infrared pyroelectric type human body detection sensor unit that is set to generate a detection signal by detecting a human body that is close to the outside, and inputs 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 controlling the operation of the motor by determining whether or not to energize the motor.