JPH0510562A - Indoor ventilating fan having thermal image detecting means - Google Patents

Abstract

PURPOSE:To obtain an indoor ventilating fan having a thermal image detecting means, judging the movement of a person or the distributing condition of temperature and heat in a room and effecting the automatic operation of the indoor ventilating fan as well as ventilation suitable for the number of personel in the room, by a method wherein the personal and the like are detected employing the thermal image detecting means consisting of a plurality of pyroelectrical heat detecting element groups. CONSTITUTION:When a person enters or goes out of some range in a room, a pyroelectrical heat detecting element groups 1 output a pulse signal in accordance therewith. This signal is inputted into the rotation driving unit control means 13 of the pyroelectrical heat detecting element groups through an existence of personel judging means 10 while the pyroelectrical heat detecting element groups 1 are rotated and moved to start the detection of the secondary thermal image of a room 5 through a thermal image detecting means 11. When a temperature and a behavier, which are corresponding to the personel, are confirmed in the detected thermal image, it is judged that some body is in the room and a ventilating fan speed control means 14 drives the rotation of a ventilating fan. When a temperature distribution, corresponding to the person in the secondary thermal image, is confirmed within a wide range, the ventilating fan is rotated with a higher speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor ventilation fan having a thermal image detecting means.

[0002]

2. Description of the Related Art The operation of a conventional indoor ventilation fan has been operated by a switch attached to the ventilation fan. There is also a ventilation fan that turns the power on and off with a wireless remote control.

[0003]

However, in the prior art as described above, a person mainly in the room operates the switch of the ventilation fan, and it is difficult to perform the fully automatic operation.

The present invention provides a fully automatic operation of an indoor ventilation fan with a relatively simple system configuration, and further provides a function linked with a disaster prevention system such as a fire alarm.

[0005]

In order to solve the above-mentioned problems, the present invention has means for detecting the movement of a person, which is composed of a plurality of pyroelectric thermal detection element groups, and thermal image detection means.

Further, according to the present invention, the movement of a person is detected, the switch of the ventilation fan is operated, and the number of people in the room is judged from the thermal image to change the fan rotation speed of the ventilation fan.

Further, according to the present invention, a pyroelectric thin film is used in the pyroelectric heat detecting element group. Further, according to the present invention, the pyroelectric heat detecting element group is arranged one-dimensionally and has a rotation axis, and the pyroelectric heat detecting element group is rotated around the rotation axis to obtain a two-dimensional thermal image of a room. Have the function to get.

Furthermore, the present invention has a function of determining the state of a fire in the room from the two-dimensional thermal image of the room and interlocking with a fire alarm.

[0009]

According to the present invention, it is possible to perform a fully automatic operation of the indoor ventilation fan by judging the movement of the person in the room and the state of heat distribution. Further, this makes it possible to perform ventilation suitable for the number of people in the room.

[0010]

Embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows one embodiment of the present invention. Figure 1
Reference numeral 3 denotes an indoor ventilation fan, which may be a wall-embedded type or a ceiling-embedded large-scaled ventilation fan installed in an office or the like. Reference numeral 1 is a pyroelectric heat detecting element group, and 2 is a signal processing circuit and a control circuit for obtaining a thermal image from the pyroelectric heat detecting element group. Reference numeral 5 is a room, and 7 is a visual field range of the pyroelectric heat detection element group.

FIG. 2 shows how the pyroelectric heat detecting element groups 1 are arranged. The pyroelectric heat detecting element groups 1 are arranged one-dimensionally in the vertical direction, and the number of heat detecting elements is equal to the viewing angle in the vertical direction. Is divided. The viewing angle in the horizontal direction of the pyroelectric heat detecting element group is set to be narrow, and in order to cover the room 5, the pyroelectric heat detecting element group 1 has a rotation drive unit 8 that rotates and moves.

The thermal image detecting means comprises a plurality of pyroelectric thermal detecting elements and a signal processing circuit. Non-contact temperature measurement methods include a quantum infrared sensor, an infrared CDD method, and a thermal infrared sensor. Although the quantum infrared sensor and the infrared CCD are excellent in sensitivity and response speed, they need to be cooled at an extremely low temperature and are not suitable for consumer use. On the other hand, the thermal infrared sensor has characteristics that it has relatively low sensitivity and a slow response speed, but it does not require cooling. Therefore, a pyroelectric infrared sensor is used for the pyroelectric thermal detection element group 1.

FIG. 3 shows an internal block of the indoor ventilation fan of the present invention. The signal processing circuit 9 of the indoor ventilation fan is composed of a person presence / absence judging means 10 for judging whether there is a person in the room 5 and a thermal image detecting means 11, and the control circuit 12 is a pyroelectric heat detecting element group. Rotation drive means 1
3, Ventilation fan fan speed control means 14, Fire alarm interlocking device 15.

The fully automatic operation of the indoor ventilation fan will be described with reference to FIG. When people come and go in a certain area of the room,
The pyroelectric heat detection element group 1 outputs a pulsed signal corresponding to this. This signal is passed through the person presence / absence determining means 10,
The pyroelectric heat detecting element group 1 is input to the rotation driving unit control means 13 of the pyroelectric heat detecting element group, and the pyroelectric heat detecting element group 1 is rotationally moved so that the thermal image detecting means 11 starts detecting the two-dimensional thermal image of the room 5. Usually, the movement of a person is said to be 1 to 2 Hz, and the thermal image is detected approximately every 1 second. That is, in the present invention, the pyroelectric heat detection element group 1 sweeps the viewing angle corresponding to the room about every one second. This is repeated for an arbitrary time, and when the detected thermal image shows the temperature and behavior corresponding to the person, it is determined that there is a person in the room, and the ventilation fan fan speed control means 14 drives the ventilation fan fan to rotate.

Further, when the thermal image of the room is repeated for a certain period of time and the temperature distribution corresponding to the person in the two-dimensional thermal image is confirmed in a wide range, if there are plural persons in the room. Then, the ventilation fan control means 14 rotates the ventilation fan fan at a higher speed.

Further, when a higher temperature object spreads over a wide area of the two-dimensional thermal image, it is determined that a fire has occurred, and the fire alarm interlocking device 15 interlocks with the fire alarm or home security system.

Next, the mechanism for obtaining a thermal image by using the pyroelectric heat detecting element group 1 will be described in detail with reference to FIG. This pyroelectric heat detection element group 1 is used in combination with a lens. Figure 5
(A) represents the stereoscopic viewing angle of the thermal image to be detected, and 16 represents the horizontal stereoscopic viewing angle when the pyroelectric thermal detection element group 1 is stationary. The stereoscopic viewing angle is set narrow in the horizontal direction. is doing. When the ventilation fan is stationary, only 16 parts of the stereoscopic viewing angle are observed, and when a person goes in and out at this stereoscopic viewing angle, the pyroelectric heat detection element group 1 is rotationally moved by the rotation driving unit 8. By this rotation drive, stereoscopic viewing angle 1
By moving 6, the pyroelectric thermal detection element group 1 observes the stereoscopic viewing angle of FIG. 4 (a), and the pyroelectric thermal detection element group 1 measures the temperature every time it is moved, Figure 4
A two-dimensional thermal image as shown in (b) is obtained.

Further, a pyroelectric infrared sensor which is usually used is a bulk type using a pyroelectric thick film sintered body.
This bulk type has a problem that the thermal time constant cannot be reduced and the response is slow. So PbTiO ₃
By using a pyroelectric heat detecting element using a pyroelectric thin film according to the above, the response time can be about 1/10 of the bulk type. By using the pyroelectric heat detection element using this pyroelectric thin film and shortening the response time, it is possible to accurately detect the behavior of the human body, the human body temperature and the high temperature object. Furthermore, if a pyroelectric thin film is used, the device can be further downsized.

[0020]

According to the present invention, a thermal image detecting means consisting of a pyroelectric type heat detection group is added to an indoor ventilation fan to determine the number of people or persons in a room and control the ventilation fan to determine the number of people. Suitable indoor ventilation and automatic operation of the ventilation fan are possible.

Also, by determining the occurrence of a fire from the detected temperature and temperature distribution of the thermal image and linking it with a fire alarm and a home security system, it can be used as a home disaster prevention system.

Moreover, according to the present invention, the thermal image can be detected with a relatively simple system configuration by rotating the pyroelectric type thermal detection group arranged one-dimensionally.

Further, by using the pyroelectric type thermal detection element group of the pyroelectric thin film, the thermal image detection speed can be improved and the system can be downsized.

Further, by adding a temperature sensor, a smoke sensor or the like to the indoor ventilation fan having the thermal image detecting means, it becomes possible to control the ventilation fan in accordance with the indoor and outdoor environment, thereby cleaning the indoor environment and maintaining a comfortable environment. Creation is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a kitchen space using an indoor ventilation fan according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing the arrangement and rotational movement of a pyroelectric heat detection element group.

FIG. 3 is an internal block diagram of a ventilation fan for fully automatic operation of the indoor ventilation fan.

FIG. 4A is a configuration diagram of an embodiment of a thermal image detecting means in the present invention, and FIG. 4B is an explanatory diagram of a mechanism for obtaining a thermal image.

[Explanation of symbols]

1 Pyroelectric heat detection element group 3 Indoor ventilation fan 7 Pyroelectric heat detection element group field of view range 9 Signal processing circuit

Claims (5)

[Claims] 1. An indoor ventilation fan having a thermal image detecting means composed of a plurality of pyroelectric heat detecting element groups. 2. An indoor ventilation fan having a thermal image detecting means according to claim 1, wherein a person or the like is detected by the thermal image detecting means. 3. An indoor ventilation fan having a thermal image detecting means according to claim 1, wherein a pyroelectric thin film is used for the pyroelectric thermal detection element group. 4. The pyroelectric thermal detection element group is linearly arranged one-dimensionally and has a rotation axis, and the pyroelectric thermal detection element group is rotated about the rotation axis to obtain a two-dimensional thermal image in a room. An indoor ventilation fan having the thermal image detecting means according to claim 1, which is obtainable. 5. An indoor ventilation fan having a thermal image detecting means according to claim 1, which has a function of determining a fire situation based on a two-dimensional thermal image distribution and detected temperature in the room and interlocking with a fire alarm or the like.