JPH06101691A - Fan lock detector for blower - Google Patents

Abstract

PURPOSE:To provide a device for detecting easily, economically and surely fan lock by utilizing a blower for general purpose without previously providing a hole for mounting an optical sensor for detecting fan lock in a fan case, fan disk, etc. CONSTITUTION:An optical sensor 6 is provided in a fan case 2 of a blower 1 having a fan 4 and a reflective tape 7 for reflecting the optical sensor is constituted to be applied to the fan 4 of the blower 1 on a position opposed to the optical sensor 6, so that the fan lock of the blower can be detected surely and instantaneously without previously providing a hole for the optical sensor 6 in the fan case 2, fan 4, etc., of th blower 1 and being easily influenced by a change or the like in ciroumferential temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan lock detecting device for a blower used for blowing or cooling.

[0002]

2. Description of the Related Art In recent years, blowers have been used in electric appliances, gas appliances, etc.
It is used in many devices for ventilation and cooling for suppressing heat generation, and as a method for detecting that the fan is locked, a temperature sensor method, a thermostat method, an optical sensor method, etc. are considered.

A conventional fan lock detection device for an optical sensor type blower will be described below. In FIG. 5, reference numeral 15 is a blower main body, 16 is a fan case forming an outer shell of the blower main body 15, 17 is a motor for rotationally driving the fan 18, and 19 is an optical sensor having a light emitting / receiving element therein. Fan case 16 located in the light emitting part
There is a mounting hole in the. Reference numeral 20 is a detection hole provided in the fan disk 21 forming the side wall of the fan 18 for passing the light beam from the optical sensor 19. 22
Is a detection circuit for determining the signal from the optical sensor 19 and detecting the rotation state of the fan 18.

The operation of the fan lock detection system of the blower configured as described above will be described with reference to FIG. First, when the fan 18 is rotating normally, the light beam emitted from the light emitting element of the optical sensor 19 is
Since it is reflected by the fan disk 21 or passes through the detection hole 20 as it is, the optical sensor 1
The light receiving signal at 9 becomes a pulse wave. Meanwhile fan 18
When is locked, the received light signal is not a pulse wave but a stable wave. The lock state of the fan 18 of the blower 1 was detected by determining this signal by the detection circuit 22.

[0005]

However, in the above-mentioned conventional configuration, it is necessary to previously provide the fan lock detection hole 20 in the fan disk or the like from the manufacturing stage of the blower. Therefore, the blower itself has a special specification. Had to do.

The present invention solves such a problem, and an object of the present invention is to provide a device for easily and inexpensively and reliably realizing fan lock detection without modifying a general-purpose blower.

[0007]

In order to achieve the above object, a first aspect of the present invention is directed to a blower, a fan case forming an outer shell of the blower, a blower fan, and a motor for driving the fan. And a fan lock detection device for a blower, which comprises an optical sensor fixed to the blower and a reflection tape for the optical sensor provided on a fan of the blower.

The second invention is a fan lock detecting device for a blower, in which a magnetic sensor is used instead of the optical sensor and a magnetic tape is used instead of the reflection tape.

[0009].

According to the first aspect of the invention described above, an optical sensor is attached to a general-purpose blower with a sensor mounting metal fitting, etc. without forming a hole for the optical sensor in a fan case or fan of the blower in advance, and a reflection tape is attached to the fan. By simply attaching the fan, the fan lock of the blower can be detected easily and reliably and without being affected by changes in ambient temperature.

The second aspect of the present invention also uses the magnetic sensor and the magnetic tape to detect the fan lock of the blower easily and reliably, without being affected by changes in the ambient temperature. Since it is possible to detect the magnetic field, it is possible to further improve the assembling property and the dirt handling because of the magnetic detection. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, 1 is a blower, 2 is a fan case that forms the outer shell of the blower 1, and 3 is a fan 4.
A motor for rotating the fan 5, a sensor mounting bracket for fixing the optical sensor 6 to the blower 1, and a sticking member 7 for the air-blowing fins 8 constituting the fan 4 to reflect a light beam emitted from the optical sensor 6. It is a reflective tape that is made of lightweight aluminum. Reference numeral 9 is a light emitting element that emits a light beam provided in the optical sensor 6, 10 is a light receiving element that receives the light beam, and 11 is a detection circuit that determines a signal from the optical sensor 6 and detects the rotation state of the fan 4. Is.

The operation of the fan lock detecting device for the blower configured as described above will be described with reference to FIG. First, when the fan 4 is rotating normally, the light beam emitted from the light emitting element 9 of the optical sensor 6 is reflected by the reflection tape 7 or passes between the fins 8 as it is. The light receiving signal in the light receiving element 10 becomes a pulse wave as shown in FIG.

Next, the case where the fan 4 is locked will be described. When the reflection tape 7 is stopped at a position where it does not receive the light beam from the light emitting element 9, the light beam continues to pass between the fins 8 and therefore the light receiving element 10 has no light receiving signal and the light receiving element 10 shown in FIG. ) Indicates a constant value.

When the reflection tape 7 is stopped at the position where it receives the light ray from the light emitting element 9, the light ray continues to be reflected by the reflection tape 7, so that the light receiving signal at the light receiving element 10 is shown in FIG. It becomes the continuous light receiving state like
It also shows a constant value. By determining the state of the received light signal in the detection circuit 11, the locked state of the fan 4 of the blower 1 can be detected accurately and instantaneously.

A second embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The difference is that instead of the optical sensor 6, the Hall element 1 is
The point is that the magnetic sensor 13 having 2 is provided and the magnetic tape 14 is used instead of the reflective tape 7.

Regarding the operation, as in the first embodiment, the detection circuit 11 determines whether the signal generated in the Hall element 12 due to the relationship with the magnetic tape 14 is a pulse wave or is constant. The locked state of the fan 4 of the blower 1 can be detected. In this embodiment, since the magnetic sensor 13 and the magnetic tape 14 are used for magnetic detection, even if the positional relationship between the two is slightly deviated, the magnetic sensor 13 and the magnetic tape 14 can be detected, and there is no risk of erroneous detection of dirt during use. It is a thing.

In the first embodiment, the reflective tape 7
Is made of aluminum, but it goes without saying that the reflecting tape 7 may be made of a material such as stainless steel having excellent reflection efficiency. In addition, in the first and second embodiments, the optical sensor 6 and the reflective tape 7, the magnetic sensor 13 and the magnetic tape 14 are used.
The position of is not limited to the position shown in the embodiment, and may be provided at the same position as the conventional one.

[0018]

As described above, according to the present invention, an optical sensor is fixed to a general-purpose blower without attaching a hole for a sensor to a fan case or a fan of a blower, and a reflection tape is attached to the fan. It is possible to detect the fan lock state of the blower easily and reliably and instantaneously without being affected by changes in the ambient temperature. Therefore, the fan lock detection device for an excellent blower can be realized because it can be manufactured at low cost even in a small amount of production without producing a special-purpose blower, and the sensor can be easily attached later. is there.

Further, by using the magnetic sensor and the magnetic tape, the same effect as described above can be obtained, and since the magnetic detection is performed, the assemblability and the dirt countermeasure are more excellent.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a fan lock detection device for a blower showing an embodiment of the first invention.

FIG. 2 is a schematic diagram illustrating a fan lock detection principle of the device.

FIG. 3 is a schematic diagram illustrating a fan lock detection principle of a fan lock detection device for a blower showing an embodiment of the second invention.

FIG. 4 is a waveform diagram for explaining the operation of the fan lock detection device of the present invention.

5A is a cross-sectional view of a conventional fan lock detection device for a blower, and FIG. 5B is a side view of a fan.

[Explanation of symbols]

 1 Blower 2 Fan Case 3 Motor 4 Fan 6 Optical Sensor 7 Reflective Tape 13 Magnetic Sensor 14 Magnetic Tape

Claims (2)

[Claims] 1. A blower, a fan case forming an outer shell of the blower, a fan for blowing, a motor for driving the fan, an optical sensor fixed to the blower, and an optical sensor provided on the fan of the blower. Fan lock detection device with a reflective tape for the fan. 2. A blower, a fan case forming an outer shell of the blower, a fan for blowing, a motor for driving the fan, a magnetic sensor fixed to the blower, and a magnetic sensor provided on the fan of the blower. Fan lock detection device with a magnetic tape for the fan.