JPH0515511B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides an air filter that collects dust in the air such as cigarette smoke by applying a high voltage between the positive and negative electrodes of a dust collection element. Regarding purifiers, especially
The present invention relates to an improvement in detecting the dust collecting state of the dust collecting element and displaying the cleaning time.

(Prior art) In general, in this type of air cleaner, in order to display the time to clean the dust collection element, when the amount of dust collected on the dust collection element increases, the air cleaner is inputted accordingly. By taking advantage of changes in the current, output current, or output voltage and comparing these values with a set value, it is possible to judge and display when it is time to clean the dust collecting element.
For example, the system disclosed in Japanese Utility Model Publication No. 43-21920 detects voltage fluctuations in the tertiary winding of a leakage transformer installed in an air purifier, and lights up a cleaning display device such as a neon lamp when the voltage falls below a predetermined value. It is made to do. Furthermore, in the method disclosed in Japanese Utility Model Publication No. 45-4466, a series circuit consisting of a resistor in which neon lamps are connected in parallel and another resistor is connected to both ends of the dust collection element, and a series circuit is connected between the two resistors. When the voltage drops, the neon lamp goes out to indicate the time to clean the dust collection element.

However, the conventional method described above utilizes the fact that the output current, output voltage, etc. of the air purifier increases or decreases as the amount of dust collected by the dust collection element increases, so the power supply voltage If there is a large variation, these may also vary greatly, causing neon lamps and the like to turn on or off, causing malfunctions.

(Problems to be Solved by the Invention) In view of the above, the present inventors have studied various other factors corresponding to the amount of dust collected by the dust collection element, and have found that depending on the type of air purifier, There is a so-called high frequency/high voltage application method that applies high frequency/high voltage between the positive and negative electrodes of the dust element to collect dust in the air. As shown in Figure 7, we found that the oscillation frequency increases in response to the increase in the amount of dust collected by the dust collection element, and is almost unaffected by fluctuations in the power supply voltage, and we focused on this point. The purpose of this invention is to detect the amount of dust collected in the dust collection element based on changes in the oscillation frequency of high frequency and high voltage, and to prevent malfunctions in determining when to clean the dust collection element. The purpose of the present invention is to improve the reliability of the cleaning time display by accurately displaying the judgment without any problem.

In addition, to consider the cause of the change in the oscillation frequency of high frequency and high voltage due to the increase in the amount of collected dust, it is necessary to generate high frequency voltage with a high frequency oscillation circuit, and step it up with a step-up transformer to generate high frequency and high voltage. In this case, the output impedance of the secondary side of the step-up transformer decreases as the amount of collected dust increases, and the converted value of the primary side of the coil and capacitor of the high-frequency oscillation circuit decreases. It is thought that the resonance frequency increases and changes.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention is an air purifier using a high frequency/high voltage application method, that is, generating high frequency/high voltage, as shown in FIG. In an air cleaner equipped with a high voltage power supply device 3, the high frequency and high voltage of the high voltage power supply device 3 is applied between the positive and negative electrodes 1 and 2 of the dust collection element A to collect dust in the air, The above high voltage power supply device 3
oscillation frequency detection means 32 for detecting the high frequency/high voltage oscillation frequency;
a comparison means 39 that compares the oscillation frequency detected by the oscillation frequency with a set value and generates a signal when the oscillation frequency is equal to or higher than the set value; and a cleaning time that receives the signal from the comparison means 39 and displays the time to clean the dust collection element A. It is equipped with a display means 40.

(Function) Accordingly, in the present invention, when the oscillation frequency of the high frequency and high voltage of the high voltage power supply device 3 increases as the amount of dust collected by the dust collection element A increases and reaches the set value, the comparison means 39 The cleaning time display means 40 is activated based on the signal, and displays the cleaning time of the dust collection element A.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows the electric circuit configuration of the air cleaner according to the present invention, where A is a dust collection element, and the dust collection element A has a dust collection positive electrode 1 disposed in the center, and a dust collection positive electrode 1 disposed in the center. It consists of two negative electrodes 2a and 2b for collecting dust, which are arranged facing each other and separated from each other by a predetermined distance.

In addition, in case 3, the generated voltage is, for example, approximately +6.5KV at the rated load, and the oscillation frequency is, for example, approximately
It is a high-voltage power supply device that generates 18KHz high frequency and high voltage, and its input side is connected to a single-phase 100V commercial power supply 5 via a run/stop switch 4, and its output side is connected to a dust collection element A. It is connected to both the positive and negative electrodes 1 and 2, and the dust collection element A
A high frequency and high voltage is applied between both the positive and negative electrodes 1 and 2. Furthermore, 6 is a fan motor that blows and circulates indoor air between the positive and negative electrodes 1 and 2 of the dust collection element A, and removes cigarette smoke, etc. from the air that is blown and circulated between the positive and negative electrodes 1 and 2. Dust is collected by the negative electrodes 2a and 2b by corona discharge based on the application of the high frequency and high voltage. In addition, 7 is an air volume changeover switch that switches the air volume by the fan motor 6 into two levels, "strong" and "weak", and 9, 9 is a dust collection element A.
The contact 10 is a grounding switch for grounding the dust collecting positive electrode 1 of the dust collecting element A.

A cleaning time display device B for displaying the cleaning time of the dust collection element A is connected to the high-voltage power supply device 3, and the cleaning time display device B has a cleaning time display lamp OL that lights up to indicate the cleaning time. is provided.

Next, the internal configuration of the high voltage power supply device 3 is shown in FIG.
The internal structure of the cleaning time display device B is shown in FIG.
First, to explain the internal configuration of the high-voltage power supply device 3 shown in FIG. 3, the overall configuration will be briefly described below.
A collector-tuned positive feedback LC oscillation circuit is used to oscillate a high frequency of approximately 18KHz, and this is boosted to approximately 6.5KV using a step-up transformer and voltage doubler rectifier circuit.
It generates high frequency and high voltage. That is, in the figure, 15 is the primary winding 15a, the secondary winding 15b, the feedback winding 15c, and the pilot winding 1.
Step-up transformer with 5d, 16 is a capacitor
C ₁ and the primary winding 15a of the step-up transformer 15; 17 includes a rectifying bridge 18 connected to the commercial power supply 5 and a smoothing capacitor C ₂ , and a DC voltage is supplied to the parallel resonant circuit 16. 19 is a transistor Tr whose collector terminal is connected to the parallel resonant circuit 16, and five resistors that apply a bias voltage to its base circuit.
R ₁ to R ₅ and feedback winding 15 of step-up transformer 15
A positive feedback circuit 20 is approximately 1.8KHz boosted by the secondary winding 15b of the step-up transformer 15.
The high-frequency voltage of 2 is boosted by 2 times while rectifying it.
diodes _D1 , _D2 and two smoothing capacitors
This is a voltage doubler rectifier circuit consisting of C ₃ and C ₄ . still,
In the figure, C ₅ is a capacitor installed in the positive feedback circuit 19.
L is a coil, and _D3 is a base protection diode. In addition, SG ₁ is a discharge gap interposed between the primary side and the secondary side, R ₆ is a discharge resistor that flows static electricity accumulated in the case to the primary side, and R ₇ is a surge resistor installed in the rectifier circuit 17. It is a resistance for absorption. Further, the pilot winding 15d of the step-up transformer 15 is connected to a surge prevention resistor _R8 , and a rectifier circuit 21 consisting of a diode _D4 and a smoothing capacitor _C6 .
Operation lamp 2 that indicates when high frequency/high voltage is generated
2 are connected.

Next, to explain the internal configuration of the cleaning time display device B shown in FIG. 4, there is a _B1 terminal extending from the parallel resonant circuit 16 shown in FIG.
An oscillation voltage detection circuit 25 connected to the _B2 terminal to detect the oscillation voltage of the parallel resonant circuit 16, a waveform shaping circuit 26 that shapes the oscillation voltage signal from the oscillation voltage detection circuit 25, and the waveform shaping circuit. A gate circuit 27 that opens or closes to allow or block passage of the oscillation voltage signal waveform-shaped in 26 to the subsequent stage, and a counter circuit 28 that measures the number of oscillations of the oscillation voltage signal that has passed through the gate circuit 27. and,
A latch circuit 29 holds and stores the number of oscillations of the oscillation voltage signal measured by the counter circuit 28, and a predetermined time Ts for the oscillation voltage signal to stabilize after switching the run/stop switch 4 to the operating side in FIG. a timer circuit 30 that closes the gate circuit 27;
The gate circuit 27 is controlled to open for a predetermined time tc, and at the end of the control, the latch circuit 29 is activated to hold and store the number of oscillations N of the oscillation voltage signal within the predetermined time tc measured by the counter circuit 28. As described above, an oscillation frequency detection means 32 configured to detect the high frequency/high voltage oscillation frequency of the high voltage power supply device 3 is constituted.

Further, the cleaning time display device B includes a reference value setting circuit 35 that sets a reference value _N0 corresponding to the oscillation frequency of high frequency and high voltage corresponding to the cleaning time of the dust collecting element A, and a memory stored in the latch circuit 29. A comparison circuit 36 compares the number of oscillations N of the oscillation voltage signal with the reference value N ₀ of the reference value setting circuit 35 and generates an H signal when the number is greater than or equal to the reference value N ₀ ; A latch circuit 37 that holds and stores the H signal, and a display circuit 3 that receives the H signal from the latch circuit 37 and controls the lighting of the cleaning time indicator OL.
8, and thus the reference value setting circuit 3
5 and the comparison circuit 36 constitute a comparison means 39 which compares the oscillation frequency detected by the oscillation frequency detection means 32 with a set value and generates an H signal when the oscillation frequency is equal to or higher than the set value. In addition, the cleaning time indicator OL constitutes a cleaning time display means 40 which receives the signal from the comparison means 39 and lights up to indicate the time to clean the dust collecting element A. In addition, in the figure, 41 is a power supply circuit that supplies DC voltage to each circuit in the cleaning time display device B.

Incidentally, the timing signal generation circuit 31 in FIG.
Specifically, it is configured as shown in Figure 5.
After the signal from the oscillator 31a is frequency-divided by the frequency divider 31b into a signal as shown in FIG.
c and 31d are sequentially divided into signals as shown in b and c of the figure, and the second T-flip-flop circuit 31d
The signal from C in the same figure is used as a gate pulse signal for opening _the gate circuit ₂₇ in FIG. After the circuit 31e performs delay conversion into a signal as shown in FIG.
A latch pulse is inputted to a first AND circuit 31f that receives a signal from a terminal of a 2T-flip-flop circuit 31d, and a signal as shown in FIG. It is used as a signal. Also, the first and second T-flip-flop circuits 31c, 31
The signals from each terminal of d are sent to the second AND circuit 31.
The counter circuit 28 in FIG. 3 is also reset by a signal as shown in FIG. 3 from the second AND circuit 31g.

Therefore, in the above embodiment, when the amount of dust collected by the dust collection element A increases, the oscillation frequency of the high frequency and high voltage of the high voltage power supply 3 gradually increases accordingly, and the oscillation within the predetermined time tc increases. The number N is the standard value N ₀ that corresponds to the cleaning period of the dust collection element A.
When it reaches, an "H" signal is generated in the comparator circuit 36 and the cleaning time indicator OL lights up.
It is possible to easily check when the dust collection element A should be cleaned. Moreover, since the high-frequency and high-voltage oscillation frequency of the high-voltage power supply 3 is hardly affected by voltage fluctuations of the commercial power supply 5, the cleaning time indicator light
The OL will not be accidentally turned on due to voltage fluctuations of the commercial power source 5, and therefore the time to clean the dust collection element A can be reliably displayed without malfunctioning, and its reliability can be improved.

In the above embodiment, the cleaning time display means 40 is constituted by a cleaning time indicator OL, but of course it may be constituted by a warning buzzer or the like.
The oscillation frequency detection means 32 is replaced by one configured by measuring the number of oscillations of the oscillation voltage signal of the high voltage power supply device 3, and is configured by one that converts the oscillation frequency into a voltage.
This converted voltage may be compared with a set voltage value corresponding to the cleaning timing of the dust collection element A.

Furthermore, in the above embodiment, the cleaning time display device B
Although it is constructed using an electronic circuit, it goes without saying that it may also be constructed using a computer system equipped with a CPU.

(Effects of the Invention) As explained above, according to the high-frequency/high-voltage application type air cleaner according to the present invention, the cleaning period for the dust collection element increases as the amount of dust collected increases, and the power supply It is detected and displayed based on a comparison with the high-frequency/high-voltage oscillation frequency setting value of the high-voltage power supply, which is almost unaffected by voltage fluctuations.
The cleaning time can be displayed reliably without malfunction, and its reliability can be improved.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of the present invention.
7 to 7 show embodiments of the present invention, FIG. 2 is an electric circuit diagram showing the overall configuration of the air purifier, and FIG.
The figure is an electrical circuit diagram showing the internal configuration of the high-voltage power supply.
Figure 4 is a block diagram showing the internal configuration of the cleaning time display device, Figure 5 is an electronic circuit diagram showing the specific configuration of the timing signal generation circuit, and Figures 6A to 6F are the outputs of each circuit in Figure 5. The waveform diagram, FIG. 7, is a diagram showing the oscillation frequency characteristics of the high frequency and high voltage of the high voltage power supply device with respect to the amount of dust collected by the dust collection element. A... Dust collection element, 1... Positive electrode for dust collection,
2a, 2b... Negative electrode for dust collection, 3... High voltage power supply, 16... Parallel resonance circuit, 32... Oscillation frequency detection means, 39... Comparison means, 40... Cleaning time display means.

Claims (1)

[Claims] 1 A high voltage power supply device 3 that generates high frequency and high voltage is provided, and the high frequency and high voltage of the high voltage power supply device 3 is applied between the positive and negative electrodes 1 and 2 of the dust collection element A to collect dust in the air. In the air purifier, an oscillation frequency detection means 32 for detecting the high frequency/high voltage oscillation frequency of the high voltage power supply device 3;
Comparing means 39 which compares the oscillation frequency detected by the oscillation frequency detection means 32 with a set value and generates a signal when the oscillation frequency is equal to or higher than the set value, and cleaning the dust collecting element A upon receiving the signal from the comparing means 39. An air cleaner characterized by comprising a cleaning time display means 40 for displaying the time.