JP2555420Y2 - Air cleaner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for applying a high voltage to an ionizing section and a dust collecting section to collect dust in the air ionized by the ionizing section at the dust collecting section.

[0002]

2. Description of the Related Art In this type of air purifier, a dust collector to which a high voltage is applied (an electrode plate of the dust collector is usually made of an aluminum plate and alternately applies a high voltage as a plus side and a ground side). If small insects such as mosquitoes or small garbage such as hair enter the
Sparks occur. If this spark continues for a long time, it may cause smoke or fire. Therefore, an overcurrent protection circuit is provided to stop the application of the high voltage for a certain time or a certain number of times. Usually, the user is warned by stopping the application of the high voltage and turning on the inspection lamp at the same time. The purpose of stopping the application of the high voltage in this way is to prevent the electrode plate of the dust collecting portion from being bent and causing an electrical short circuit, or the ionized wire from being cut and shorted to the ground side, thereby preventing the original function from being performed. is there.

[0003]

[Problems to be solved by the present invention] However, if the number of insects such as mosquitoes is small, if the operation of stopping the high voltage application by the protection circuit is extended until the spark occurs a plurality of times, the insects dry and operate normally. However, if the humidity in the air is high with dozens of insects in it (several dozens at a time, but few enter at the same time), all insects The sparks occur successively in a short period of time, and the above operation of the protection circuit cannot be tolerated. Therefore, the lighting lamp must be immediately turned on to stop the operation, which may inconvenience the user.

Therefore, conventionally, as a measure against sparking, an aluminum electrode plate on either the plus side or the ground side of the dust collecting portion has been insulated with resin. However, in this case, the cost per electrode plate is about 5 times as compared with the case where no insulation is performed.
This is twice as high, and the number of electrodes used is usually 40 to 50. Therefore, the cost is extremely high as a whole, which is not practical.

An object of the present invention is to wait for the humidity in the air to drop to near normal humidity without turning on the inspection lamp or stopping the operation even if the spark is continuous for a short time as described above. It is another object of the present invention to provide an air purifier capable of finally determining whether to turn on or stop operation of an inspection lamp and automatically returning to a normal operation state if there is no overcurrent.

[0006]

The air purifier according to the present invention comprises an ionizing section, a dust collecting section, a high voltage generating circuit for applying a high voltage to the ionizing section and the dust collecting section, and an excess voltage in the high voltage generating circuit. An overcurrent detection circuit for detecting the presence or absence of a current,
When the overcurrent detection circuit detects that an overcurrent is present, the high-voltage generation circuit is stopped, and a short period of time t
Operates the high-voltage generating circuit again after _1, if there is overcurrent detection by the time overcurrent detection circuit first control to stop the high voltage generating circuit again, the first with a sufficiently long period T ₁ than the t ₁ control second repeating the control of, when there still overcurrent even after repeated control of the second predetermined time T ₂ or more, comprising a control circuit for stopping the operation of the warning means operating or the air purifier .

[0007]

According to such an air purifier, for example, when a spark occurs in the dust collecting section and the overcurrent detecting circuit becomes overcurrent, the high voltage is applied to the ionizing section and the dust collecting section by the high voltage generating circuit once. stop, is again high pressure applied to the short predetermined time t after _1. If there is still an overcurrent at that time, the application of the high voltage is stopped again. Then, such a high pressure is applied and stopping short inversion operation is repeated by T ₁ period, when it becomes an overcurrent without taking place a predetermined time T ₂ or more, but automatically returns to the normal operating condition, still When there is an overcurrent, the warning means is operated or the operation of the air dust collector is stopped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram of an air purifier according to the present invention.
An ionization unit 11, a dust collection unit 12, and a fan unit 13 are provided in a housing 10, and an operation unit 14 and a display unit 15 are provided outside the housing 10.

In FIG. 1, dirty air is supplied to a fan unit 1.
3 sucks air into the ionization section 11. The ionization unit 11 is normally applied with a high voltage of 4 to 9 KV, and positively charges the dust particles in the inhaled air. As shown in FIG. 2, the dust collecting section 12 includes a plurality of positive electrode plates 1 made of an aluminum plate.
2a and the ground-side electrode plates 12b are alternately arranged to face each other, and a voltage of 2 to 5 KV is normally applied.

FIG. 3 shows an electrical configuration of the air purifier. When the main switch provided in the operation unit 14 is turned on, the control circuit (microcomputer) 16 turns on the motor of the fan unit 13 and turns on the high voltage generation circuit 17. The high voltage generation circuit 17 is
8, the power supply voltage is increased, and the ionization unit 11 and the dust collection unit 12
Is applied as described above. Overcurrent detection circuit 19
Detects an overcurrent flowing through the high voltage generation circuit 17. The detection level is set to, for example, about 1 to 3 mA.

Now, as shown in FIG. 2, insects 20 such as mosquitoes enter between the positive side electrode plate 12a and the ground side electrode plate 12b of the dust collecting part 12, where they are sparked and the high voltage generation circuit 17 is supplied with an overcurrent. Flows, the overcurrent detection circuit 19 detects this and sends a signal to the control circuit 16. Upon receiving this signal, the control circuit 16 turns off the high voltage generation circuit 17 and
1 and the application of the high voltage to the dust collecting section 12 are stopped. This state is shown in FIG. However, at this time, the fan unit 13 is not stopped. Further, the display unit 14 does not display a warning prompting an inspection.

Next, the control circuit 16 determines that t ₁ is shorter than point a.
After a lapse of time (point b), the high voltage generation circuit 17 is turned on again, and the presence or absence of an overcurrent by the overcurrent detection circuit 19 is determined. At this time, if there is no overcurrent, the high-voltage generation circuit 17 is turned on as it is.
Turn off 7 again. Here, the time t ₁ is usually 1 to 10
Set to about seconds.

[0013] the presence overcurrent ₁ hour after t as the above case, the control circuit 16 again performs the operation of FIG. 4 with a sufficiently period of long time T ₁ from t ₁ hour, there overcurrent again after T ₁ If so, the same operation is repeated. Figure 5 shows the state when the state of there overcurrent continues, continue the operation shown in FIG. 4 from the first point A in the cycle of T ₁ and point B · C point .... Then, a sufficiently long period of time T ₂ or more repeating this,
If there still overcurrent during that time T ₂ has elapsed (F point in FIG. 5), the control circuit 16 stops the motor of the fan unit 13, a warning by lighting inspection lamp of the display unit 15. When there is no overcurrent at the point F, the control circuit 16 continuously turns on the high voltage generation circuit 17 to return to the normal state. Incidentally, T ₁ 1 to 10 min, T ₂ 1-2
It is realistic to set the range to 4 hours.

[0014]

[Effects of the Invention] As described above, in the present invention, the judgment of the presence or absence of an overcurrent in a short time is not suddenly generated or the operation is stopped. Repeatedly, even if a sufficient time has passed, a warning is issued or operation is stopped when there is still an overcurrent, so that it is possible to make a final determination on the occurrence of a warning or operation waiting for the recovery of the in-flight or room environment. Therefore, each time a small garbage such as insects such as mosquitoes or hairs enters and sparks, the inspection lamp is turned on or the operation is stopped, and the user is not inconvenienced and the safety is secured. It can be automatically returned to a normal state.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an air purifier according to the present invention.

FIG. 2 is a schematic configuration diagram of a dust collecting unit of the air purifier.

FIG. 3 is a block diagram of an electric configuration of the air purifier.

FIG. 4 is a timing chart of a first control operation by the control circuit.

FIG. 5 is a timing chart of a second control operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Ionization part 12 Dust collection part 15 Display part 16 Control part 17 High voltage generation circuit 19 Overcurrent detection circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. An ionization section, a dust collection section, a high voltage generation circuit for applying a high voltage to the ionization section and the dust collection section, an overcurrent detection circuit for detecting the presence or absence of an overcurrent in the high voltage generation circuit, when detection by the overcurrent detection circuit becomes there overcurrent, after stopping the high-voltage generation circuit to operate the high voltage generating circuit again after a short predetermined time t _1, detection by this time overcurrent detection circuit over A first control for stopping the high-voltage generating circuit again if a current is present, a second control for repeating the first control in a cycle T ₁ sufficiently longer than the t ₁ ,
An air purifier, comprising: a control circuit for operating a warning means or stopping the operation of the air purifier when an overcurrent still exists even after the _second control is repeated for a predetermined time T2 or more.