JP2000257931A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb variations in motor and the like and make volume of air of a main body constant by a method, wherein a ventilating fan and a filter are accommodated in the main body provided with a suction port and a ventilating port, while the ventilating fan is driven through an inverter to control the rotation of the motor according to the speed of passing air. SOLUTION: An air cleaner main body 1 cleans air, sucked by a ventilating fan 4 which is mounted on an inverter 5 in the main body, through an air suction port 6 and containing dust, by a dust collecting filter 2 and a deodorizing filter 3, then discharges the air to the outside of the main body through a ventilating port 7. The number of rotation of the driving motor 5 is detected by a rotating number detecting means and is controlled by a control means. The rotation of the motor 5 is controlled according to air speed by detecting the air-flow resistance of the dust collecting filter 2 and the like or the passing speed of air in the main body 1. According to this control, air volume required actually by the main body 1 including all the variations, can be made constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier used for ordinary households or business use, and more particularly to high reliability and low cost.

[0002]

2. Description of the Related Art The structure of a conventional air cleaner will be described with reference to FIG.

An air inlet 10 is provided in an air purifier body 101.
In order from the 6 side, a dust collecting filter 102 and a deodorizing filter 103 are provided, and the dust-containing air sucked from the air inlet 106 by the blower fan 104 attached to the motor 105 is purified by passing through both the filters 102 and 103, The air is discharged from the air outlet 107 to the outside.

[0004]

In the conventional air purifier, an induction motor has been mainly used as a motor for driving the blower fan 104 in order to reduce the cost. However, recently, an inverter motor has been used from the viewpoint of energy saving. It is being used. However, the inverter motor is a semiconductor control, and the rotation speed is largely fluctuated due to, for example, a current amplification factor fluctuating twice or more due to a semiconductor temperature characteristic or a variation in semiconductor manufacturing. The rotation speed control was performed. On the other hand, in the air purifier, the variation in the air flow was large even when the rotation of the motor was constant because the variation in the air resistance of the filter was large.

[0005] When the variation of the air volume increases, the cleaning ability of the air purifier increases, and when the same purifier is used in the market, some purifiers clean well while others do not. There are problems such as causing confusion and the ability to produce air whose cleaning capacity does not reach the target value.Because the equipment must be made more sophisticated and expensive, the air flow resistance of the filter, In order to keep the pressure loss constant, many restrictions and efforts have been made to reduce the variation among the elements, such as uniformity of the material and uniformity of the production, resulting in high cost. It is an object of the present invention to solve such a conventional problem and to provide a highly reliable and low-cost air purifier.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a main body provided with an intake port for taking in outside air and a ventilation port for exhaust, and a built-in fan and a filter. Since it can be directly controlled to obtain the air volume required as an air purifier by controlling the rotation of the inverter motor by driving the motor according to the air flow resistance of the filter or the passing wind speed in the main body, more reliable In addition to being a certain device, control for keeping the rotation of the motor constant can be simplified or eliminated. Thus, a highly reliable and low-cost air purifier can be provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION
The air blower and the filter are built in the main body provided with the air inlet for the outside air and the air outlet for the exhaust, and the air blower is driven by an inverter motor, and the rotation of the inverter motor is controlled by the air flow resistance of the filter or the like. By controlling in accordance with the passing wind speed and / or the passing air volume in the inside, it is possible to absorb all the variations of the inverter motor and the variations of the filter and the like, and to make the air volume of the main body constant. Therefore, a control circuit for keeping the number of rotations built in the motor constant can be simplified or eliminated. Thus, high reliability and low price can be achieved.

According to a second aspect of the present invention, dust is collected by controlling the rotation of an inverter motor based on the amount of air or the speed of air in another passage provided so as to bypass external air without passing through a filter or the like. Alternatively, when the air flow resistance of the filter such as deodorization, that is, the pressure loss is large, the air volume in another passage becomes large, and changes according to the change in pressure loss. By detecting and controlling this change, the air volume of the main body can be made constant.

According to a third aspect of the present invention, the inverter motor is controlled in accordance with the amount of wind or the speed of the lee of a filter provided in the main body. The sensor can be placed at the position with the best sensitivity in the vicinity of the filter end. Further, by providing the wind speed detection sensor downstream of the dust collection filter, dust in the air adheres to the wind speed detection sensor, and the sensor sensitivity is not reduced, so that the sensor can be used stably and reliably for a long period of time.

According to a fourth aspect of the present invention, by controlling the main body in accordance with the wind speed and / or the air volume discharged from the air outlet, the air volume is kept constant even if air leakage occurs in the main body. Exhaust air volume can be ensured, and reliability can be improved.

[0011]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described.
This will be described with reference to FIGS.

A dust collecting filter 2 and a deodorizing filter 3 are provided in the air purifier body 1 in this order from the intake port 6 side, and include a filter sucked from the intake port 6 by a blower fan 4 attached to an inverter motor 5. The dust air is purified by passing through both filters 2 and 3, and is discharged to the outside from the air outlet 7. Filter 2 in body 1
8 is a wind speed detection sensor that is installed in the air passage 10 that is open in a lattice shape between the fan 3 and the blower fan 4 and that detects the wind speed of the air passing through the main body 1.

The size of each lattice of the lattice portion of the ventilation passage 10 is set to a size such that a finger or the like does not easily enter the ventilation fan unit. Reference numeral 9 denotes a control board that controls the number of revolutions of the inverter motor 5 so that the output of the wind speed detection sensor 8 keeps the wind speed constant. As shown in FIG. 2, the control board 9 is provided with a control means 95, a driving means 96, a rotation speed detecting means 97, and a wind speed detecting means 99 excluding the wind speed detecting sensor 8.

The operation of the above configuration is as follows.

The dust-containing air sucked from the intake port 6 by the blower fan 4 attached to the inverter motor 5 in the air purifier body 1 is purified by passing through the dust collecting filter 2 and the deodorizing filter 3, and is purified. 7 to the outside. The control means 95 causes the drive motor 96 to rotate the inverter motor 5. The rotation number of the motor 5 is detected by the rotation number detection means 97, and the rotation number is controlled by the control means 95. The wind speed detecting sensor 8 forming a part of the wind speed detecting means 99 detects the passing wind speed in the main body 1. By controlling the rotation of the inverter motor 5 in accordance with the air flow resistance of the dust filter 2 or the like or the passing wind velocity of the air in the main body 1, the actual necessary air volume of the main body 1 including all variations is kept constant. Can be

Further, a detection unit for detecting rotation of the inverter motor 5 using a Hall element and a magnet provided in the inverter motor 5 or a control unit can be simplified or eliminated.

As the wind speed detecting sensor 8, it is common to use a relatively inexpensive thermo-sensitive element. However, if a thermo-sensitive element is used, it is easily affected by the ambient temperature. However, R92 and TH2 shown by the thin line in FIG. The effect can be eliminated by additionally providing a compensation circuit such as. Also R91 and R
The resistance 92 may be changed at the same rate depending on the ambient temperature, for example, by changing it to a heat-sensitive element, so that the resistance is not affected by the ambient temperature. In this way, the use of the heat-sensitive element can easily configure an inexpensive wind speed detection.

Also, by controlling the inverter motor 5 so that the air volume inside the main body 1 is detected and the air volume is always kept constant, the air volume of the main body 1 which is the result after all variations due to various factors are included is kept constant. There is a big feature that can be. As described above, according to the present invention, the variation in air volume is small, the variation in the cleaning performance as an air purifier is also small, and there is no need to use a device with a higher capacity than necessary, so a highly reliable and low-cost device is provided. can do.

Embodiment 2 Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Another passage 14 is provided so as to bypass the dust filter 2 and the like provided in the main body 1 so that the outside air is directly taken in from the passage 14 and the wind speed of the passage air is introduced into the passage 14. Sensor 13 for detecting
Is provided. Reference numeral 11 denotes a dust detection sensor provided for automatically operating the air purifier when the amount of dust increases, 12 denotes an air inlet for taking in air to the dust sensor, and 15 denotes an air intake from the air inlet 12 of the dust detection sensor 11. Air passed through the dust detection sensor 11 without fail.
Alternatively, it is a packing for preventing air from leaking to prevent dust from entering the dust detection sensor 11 from other places.

The thick line of the arrow indicates the flow of the wind passing through the intake port 12, the dust detection sensor 11, the passage 14, and the sensor 13 in the passage 14.

The operation of the above configuration is as follows.

Dust collecting filter 2 or deodorizing filter 3
When the air flow resistance, that is, the pressure loss, is large, the air volume in the passage 14 is large and changes according to the change in the pressure loss. By detecting this change in the air volume with the sensor 13 and controlling the rotation speed of the inverter motor 5, The air volume of the main body 1 can be made constant.

Further, by providing the sensor 13 in the passage 14, the sensor cannot be seen from the outside and there is no danger that the sensor is broken by the user and the reliability can be improved. In FIG. 3, as another passage 14, the sensor 13 is provided in a passage in which another sensor such as the dust sensor 11 is originally provided, and the passage 14 is shared. Although the one that can be performed is shown, the same effect can be obtained even if the passage 14 is provided independently.

Embodiment 3 Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

A grill hole having a lattice-shaped opening between a part of the filter chamber 33 or the filter 2 or 3 and the blower fan 4 for detecting the wind speed downstream of the dust filter 2 provided in the main body 1. A sensor 31 or 31 ′ is provided at the sensor 34 or the like, and the rotation of the inverter motor 5 is controlled in accordance with the output of the sensor 31 or 31 ′.

The operation of the above configuration is as follows.

By providing sensors 31 and 31 'for detecting the wind speed downstream of the dust collecting filter 2, the amount of air passing through the main body 1 can be known.
By controlling the rotation of the inverter motor 5 by the output of 31 ', the amount of air passing through the main body 1 can be kept constant. In addition, the sensors 31, 31 'can be disposed at any positions from the grill hole 34, where the wind speed is the leeward of the dust collection filter 2, to the sensor 31 near the end of the slowest filter.
1 'can be placed at the position of the wind speed with the best sensitivity. In addition, by providing the sensors 31 and 31 ′ leeward of the dust collection filter 2, dust in the air adheres and the sensitivity of the sensor does not decrease, so that the sensor can be used stably for a long time with high reliability.

Embodiment 4 Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The sensor 51 for detecting the wind speed is
The air outlet 7 is provided near the air outlet 7 so as to detect the wind speed discharged by the fan 4 from the air outlet 7 provided in the air outlet 7.

The operation of the above configuration is as follows.

By providing a sensor 51 for detecting the wind speed discharged from the air outlet 7 in the vicinity of the air outlet 7, even if air leaks to the outside inside the main body 1 even if it is generated,
The exhaust air volume can be kept constant, and reliability can be improved.

[0033]

According to the first aspect of the present invention,
The dust-containing air sucked from the intake port by the blower fan attached to the inverter motor is
It is purified by passing through a deodorizing filter, and is discharged to the outside through an air vent. By controlling the rotation speed of the inverter motor according to the air flow resistance of the dust collection filter or the wind speed passing through the main body, all variations in the inverter motor and the dust collection filter are absorbed to prevent the main body 1 from rotating. Can be made constant. Therefore, a control circuit built in the inverter motor for keeping the number of revolutions constant can be simplified or eliminated, and thus high reliability and low cost can be achieved.

According to the invention of claim 2 of the present invention, there is provided another passage provided so as to bypass without passing through a dust collecting filter or the like, and a sensor for detecting an air volume or a wind speed in the passage. It controls the rotation of the inverter motor according to the air flow rate or the wind speed in the passage.When the air flow resistance of the dust collection filter or deodorizing filter, that is, the pressure loss is large, the air flow in another passage becomes large, Change. By detecting and controlling this change, the air volume of the main body can be made constant. Furthermore,
By providing the above-described sensor in an existing bypass passage provided for mounting another sensor such as a dust sensor, it is not necessary to provide a separate bypass passage, and the cost can be reduced.

According to the third aspect of the present invention, by providing a sensor for detecting the wind speed downstream of the dust collecting filter, the amount of air passing through the main body can be known.
By controlling the rotation of the inverter motor by the output of this sensor, the wind speed passing through the main body can be kept constant. By arranging the sensor downstream of the dust filter, the sensor can be arranged at the position of the wind speed with the best sensitivity. Further, by disposing the sensor on the lee of the dust collecting filter, dust in the air is less likely to adhere to the sensor, and the sensor sensitivity is not reduced, and the sensor can be used stably and reliably for a long period of time.

According to the invention described in claim 4 of the present invention, by providing a sensor for detecting the wind speed discharged from the air outlet near the air outlet, even if air leakage occurs in the main body. , The exhaust air volume can be made constant, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of an air purifier showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram of the air purifier.

FIG. 3 is a sectional configuration view of an air purifier showing a third embodiment of the present invention.

FIG. 4 is a sectional view of a main part of an air purifier showing a fourth embodiment of the present invention.

FIG. 5 is a sectional configuration diagram of an air purifier showing a fifth embodiment of the present invention.

FIG. 6 is a cross-sectional configuration diagram of an air purifier showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Dust collection filter 3 Deodorizing filter 4 Fan 5 Inverter motor 6 Intake port 7 Exhaust port 8 Wind speed detection sensor 9 Control board

Claims (4)

[Claims] An air blower and a filter are built in a main body provided with an intake port for taking in outside air and an air blow port for exhaust air, the blower fan is driven by an inverter motor, and the rotation of the inverter motor is controlled by the filter or the like. An air purifier that is controlled in accordance with the air flow resistance or the passing air velocity and / or the amount of passing air in the main body. 2. The air purifier according to claim 1, wherein the rotation of the inverter motor is controlled by the flow rate or wind speed in another passage provided so as to bypass the outside air without passing through a filter or the like. 3. The air purifier according to claim 1, wherein the rotation of the inverter motor is controlled according to the wind speed and / or the amount of air downstream of a filter provided in the main body. 4. A main body provided with an intake port for taking in outside air and a blow port for exhaust air, a built-in blower fan and a filter, and the blower fan is driven by an inverter motor. An air purifier that controls according to the air velocity and / or air volume discharged from the air purifier.