JPH06323584A - Blower - Google Patents

Abstract

PURPOSE:To avoid an erroneous operation by using an ultraviolet sensor as a flame sensor for sending an ultraviolet ray having a short wavelength and providing ultraviolet attenuating means for limiting an ultraviolet ray incident direction, a range on a surface of an ultraviolet permeable glass tube. CONSTITUTION:A flame sensor 63 soldered onto a printed board 62 is arranged on an ultraviolet sensor holder 61. Ultraviolet attenuating means 65 arranged on a flame sensor holder body by using an engaging protrusion reflects 68, attenuates 69 an ultraviolet ray introduced from a ceiling direction at an acute angle via a hood 66 and lowers an intensity of the ray to a sensing level or less of the sensor 63. Since an ultraviolet ray 67 emitted from a flame of a lighter, etc., for the purpose of an air cleaner is incident on the sensor 63 at an angle near a right angle to a slit 70, the sensor 63 can senses the incident ray. Accordingly, the flame sensor responds to an illuminator for emitting an ultraviolet ray having a short wavelength and can avoid a cause of an erroneous operation of starting its operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower using an ultraviolet sensor as a flame sensor.

[0002]

2. Description of the Related Art FIG. 1 shows an example of an operating principle of a short-wavelength ultraviolet sensor (hereinafter referred to as a flame sensor) and an air cleaner and a range hood fan using the flame sensor, which are conventionally used in a blower. 4 to FIG.

FIG. 1 is a diagram showing the operating principle of a flame sensor which is a problem in the present invention. A special gas 2 is hermetically sealed in an ultraviolet-transparent glass tube 1 capable of transmitting ultraviolet rays of a short wavelength, and an anode 3 and a cathode 4 serving as a photocathode are arranged opposite to each other. High voltage 5 between the anode and cathode
Is applied, and the current limiting resistor 6 is arranged on the anode side. When ultraviolet rays 7 are incident on the cathode surface, photoelectrons 8 are emitted from the cathode surface. The photoelectrons collide with the molecules of the enclosed special gas one after another, causing an avalanche phenomenon 9 and causing a discharge current 10 to flow between the cathode and the anode.

FIG. 2 is a block circuit diagram showing a sensor and a peripheral circuit. In the flame sensor 22 which is periodically applied by the switching power supply 21, a discharge current synchronized with the frequency of the switching power supply is generated by incidence of ultraviolet rays. Shed. If the sensor resistor 23 is connected in series with the flame sensor 22, the voltage variation across the sensor resistor 23 can be obtained in a pulsed manner, so that the pulse signal can be taken into the microcomputer 25 via the control circuit 24. it can. In the microcomputer 25,
The presence or absence of flame is judged from the frequency of the pulse signal, and the blower 2
Control the operation of 6.

FIG. 3 is an external view of an air cleaner using the flame sensor 32. A flame sensor holder portion 33 is provided on the front surface of the air purifier body 31, and the flame sensor 32 is arranged so that the ultraviolet ray transmitting glass tube projects from the flame sensor holder portion 33 by approximately a semicircle with respect to the tube cross section. Set up. The field-of-view range 34 of the flame sensor 32 obtained by this structure is as shown by the diagonal lines in the figure.

FIG. 4 shows a state in which a range hood fan using the flame sensor 43 is arranged in a kitchen. In the figure, the range hood fan main body 41 is installed on the wall surface, and the flame sensor 43 is incorporated in the flame sensor holder 42 and arranged in the range hood fan main body 41. Within the field of view 46 of the flame sensor 43, the gas stove 45 is placed on the stove base 44.
Is installed, and the flame sensor 43 can detect the ultraviolet rays obtained from the flame of the gas stove during cooking (Japanese Patent Laid-Open No. 4-186041).

[0007]

However, in exhibitions and showrooms, lighting equipment that emits ultraviolet rays of short wavelength is often used, and in recent years, even in general households, lighting equipment that emits ultraviolet rays such as halogen lamps. Are increasingly being used. In the flame sensor described above, since the light source is not selected, if the ultraviolet ray having the response wavelength of the flame sensor is incident, it is output. Therefore, when the blower is installed in the place where the lighting fixture is installed in the automatic operation mode, the ultraviolet ray from the lighting fixture is regarded as a flame from the performance of the blower and the automatic operation is started.

In the case of the range hood fan shown in FIG. 4 as well, since the ultraviolet light has a reflectance close to total reflection on the metal surface, even if the luminaire is not directly in the field of view of the sensor, it reflects on the gas stove or wall surface. Eventually, it will enter the flame sensor.

Due to these problems, it is not possible to demonstrate a blower device having a flame sensor at an exhibition or a showroom, and not only the PR effect to the user disappears but also it is regarded as a defect of the product, which is an obstacle. It was

[0010]

According to the present invention, in order to solve the above-mentioned problems, the ultraviolet ray transmitting glass tube surface of the flame sensor protruding from the flame sensor holder or the front side thereof is provided.
It is provided with an ultraviolet ray attenuating means for limiting the incident direction and range of the ultraviolet ray.

As another means of the present invention, the ultraviolet attenuating means is a sealing material or a removable cover. The user attaches the ultraviolet attenuating seal or attaches the ultraviolet attenuating cover to the surface of the ultraviolet ray transmitting glass tube of the flame sensor only when there is a lighting fixture that emits ultraviolet rays in the environment where the product is installed.

[0012]

By using the above technical means, even when a blower having a flame sensor is arranged in the vicinity of a lighting device such as a halogen lamp that emits ultraviolet rays of a short wavelength, it is emitted from the lighting device. It is possible to reduce the influence of short-wavelength ultraviolet rays and to give preference to detecting ultraviolet rays emitted from flames.

Further, according to another means of the present invention, a sealing material or a cover for attenuating ultraviolet rays is included as an accessory of the product so that the customer can arrange these filter materials as needed. Therefore, the visual field range of the flame sensor can be secured in an environment where there is no obstacle due to the lighting equipment.

[0014]

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

FIG. 5 is a structural diagram showing the arrangement of ultraviolet attenuating means in the flame sensor holder portion of the air cleaner according to the embodiment of the present invention. A flame sensor support shape 52 having a semi-circular arc shape is integrally formed at the center of the flame sensor holder main body 51, and a flame sensor 53 is provided inside the flame sensor support shape.
5 and the cathode 56 are arranged so that they can be seen widely from the outside. The ultraviolet ray attenuating means 57 is provided with openings 58 at equal intervals, and eaves 59 are provided above the openings to prevent ultraviolet rays emitted from a lighting fixture installed on the ceiling from entering the flame sensor. I am trying. The ultraviolet attenuating means 57 and the flame sensor holder main body 51 are engaged with each other by engaging the engaging projection 60 of the ultraviolet attenuating means 57 with the flame sensor holder main body 5.
The first engaging hole 54 is engaged, so that it can be attached and detached.

6 (a) and 6 (b) are sectional views comparing the structure of the ultraviolet attenuating means 57 shown in FIG. 5 in the case of stationary installation and in the case of wall hanging, and FIG. 6 (a) shows installation. When placed
FIG. 6B shows the case of wall mounting. In FIG. 6B, the ultraviolet sensor holder 61 is provided with a flame sensor 63 soldered to the printed circuit board 62, and the packing 64 prevents the flame sensor 63 from falling into the printed circuit board. In the ultraviolet ray attenuating means 65 arranged on the flame sensor holder main body 51 using the engaging projections 60, the ultraviolet ray which is inserted from the ceiling direction at an acute angle is reflected by the eaves 66, 68.
Attenuation 69 is performed to reduce the light intensity of ultraviolet rays to a level below that detected by the flame sensor 63. The ultraviolet ray 67 emitted from the flame of a lighter, which is the object of the air cleaner, is incident on the flame sensor 63 at an angle close to a right angle with respect to the slit 70, so that the flame sensor 63 can detect the incident ultraviolet ray.

Since each structural part of the flame sensor holder portion in FIG. 6B is the same as that in FIG. 6A, the description thereof will be omitted. FIG. 6B shows the structure of the ultraviolet ray attenuating means 71 when the air cleaner is mounted on a wall.
The eaves 72 is tilted downward as a whole to prevent ultraviolet rays 73 from a lighting device which is irradiated from the lateral direction. The slight amount of the ultraviolet rays 75 entering from the slit 74 scatters the ultraviolet rays by roughening the surface of the slit lower surface 76. On the other hand, ultraviolet rays 7 emitted from the flame of a lighter etc.
The reference numeral 7 indicates that the intensity of incident light is increased by finishing the upper surface of the slit with good surface roughness by reflecting on the upper surface 78 of the slit and entering the flame sensor 63 or by attaching a metal seal or the like.

FIG. 7 is an external view of a flame sensor unit used in a range hood fan. Flame sensor case 8
In the inside of 1, the half of the arc shape of the ultraviolet ray transmitting glass tube of the flame sensor 82 is disposed so as to protrude, and the ultraviolet ray attenuation seal 83 is attached to the surface of the protruding glass tube portion.

FIG. 8 shows the results of measurement by actually changing the area of the opening of the ultraviolet attenuating seal shown in FIG. 7 and attaching it to a range hood fan. As a measuring method, a pan is put on the gas stove, a stove is not put on the stove, and a halogen lamp is radiated from the left and right front of the range hood fan without burning the stove. From this result, it was confirmed that by sticking the ultraviolet attenuating seal to the surface of the glass tube of the flame sensor, the halogen lamp was not affected and the flame could be detected reliably.

[0020]

As described above, according to the present invention, a flame sensor, which has been a problem in an air cleaner or a range hood fan having a flame sensor, responds to a lighting device that emits ultraviolet light having a short wavelength. However, it is possible to avoid a malfunctioning factor such as starting operation, and not only to provide a user with a more reliable product, but also to prevent a demonstration at an exhibition or a showroom from hindering the PR effect of the product. It will become higher and lead to sales expansion.

[Brief description of drawings]

FIG. 1 is an operation principle diagram of a conventional flame sensor.

FIG. 2 is a block circuit diagram including a flame sensor described in FIG.

FIG. 3 is a perspective view of an air cleaner using a flame sensor showing a conventional example.

FIG. 4 is a side view of a range hood fan using a conventional flame sensor.

FIG. 5 is an exploded perspective view of ultraviolet attenuating means used in the air cleaner according to the embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of the ultraviolet ray attenuator shown in FIG.

FIG. 7 is an exploded perspective view of ultraviolet attenuating means used in a range hood fan according to another embodiment of the present invention.

8 is a diagram showing various measurement results of an ultraviolet ray attenuating unit in the range hood fan shown in FIG.

[Explanation of symbols]

1 ... Ultraviolet transparent glass tube, 2 ... Special gas, 3 ... Anode, 4 ... Cathode, 5 ... High voltage, 6 ... Current limiting resistance, 7
... ultraviolet rays, 8 ... photoelectrons, 9 ... electron avalanche phenomenon, 10 ... discharge current, 21 ... switching power supply, 22 ... flame sensor, 2
3 ... Sensor resistance, 24 ... Control circuit, 25 ... Microcomputer, 2
6 ... Blower, 31 ... Air purifier body, 32 ... Flame sensor,
33 ... Flame sensor holder part, 34 ... Flame sensor visual field range, 41 ... Range hood fan main body, 42 ... Flame sensor holder, 43 ... Flame sensor, 44 ... Stove stand, 45 ... Gas stove, 46 ... Flame sensor visual field range, 51 ... Flame sensor holder main body, 52 ... Flame sensor support shape, 53 ... Flame sensor, 54 ... Engagement hole, 55 ... Anode, 56 ... Cathode,
57 ... Ultraviolet ray attenuation means, 58 ... Opening part, 59 ... Eaves,
60 ... Engaging projections, 61 ... UV sensor holder, 62 ...
Printed circuit board, 63 ... Flame sensor, 64 ... Packing, 65
... UV attenuator, 66 ... Eaves, 67 ... UV emitted from flames of lighters, 68 ... Reflected light, 69 ... Attenuated light, 70 ... Slit, 71 ... UV attenuator, 72 ... Eaves, 73 ... From lighting equipment UV rays, 74 ... slits,
75 ... UV rays incident from the slit, 76 ... Bottom surface of the slit, 77 ... UV rays emitted from flame of lighter,
78 ... Slit upper surface, 81 ... Flame sensor case, 82 ... Flame sensor, 83 ... UV attenuation seal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Koizumi 1-1-1, Higashi-Taga-cho, Hitachi-shi, Ibaraki Hirtata Technology Co., Ltd. (72) Masanori Uchiyama 1-1--1, Higashi-Taga-cho, Hitachi No. 1 Nitate Taga Technology Co., Ltd.

Claims (2)

[Claims] 1. A blower device whose operation is controlled by one ultraviolet sensor or a plurality of sensors including an ultraviolet sensor, wherein the ultraviolet sensor detects a flame of a short wavelength emitted from a flame that burns gas or the like. A blower for use as a sensor, characterized in that an ultraviolet ray attenuating means for limiting the incident direction and range of ultraviolet rays is provided on the surface of the ultraviolet ray transmitting glass tube of the flame sensor. 2. The ultraviolet attenuating means is an ultraviolet attenuating sealing material which can be arbitrarily attached by a user or a removable ultraviolet attenuating cover, and when the ultraviolet attenuating means needs to be arranged, the ultraviolet attenuating means is used. The blower according to claim 1, wherein a damping seal is attached to the surface of the glass tube of the flame sensor or the ultraviolet attenuating cover is provided.