JPH0459583B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a life display device for a deodorizing filter used in an air cleaner or the like. Structure of the conventional example and its problems As shown in Fig. 1, the conventional air purifier has a casing 1, inside which is a motor 3 that drives a fan 2, and on the front side thereof a dust collection filter 4 and a deodorizing filter. 5. 6 is a suction port of the casing 1, and 7 is an exhaust port. When the fan 2 is operated in the above configuration, indoor air is sucked in from the suction port 6 as shown by the arrow, purified by the filters 4 and 5, and discharged into the room from the exhaust port 7. As for the lifespan of the deodorizing filter 5 used in this manner, regardless of the operation of the fan 2, the deodorizing filter 5 is replaced approximately every six months from when a new deodorizing filter is started to be installed.
In reality, the lifespan of the deodorizing filter 5 is supposed to vary depending on the concentration of the odor gas, the amount of air passing through the deodorizing filter, and the operating time, making it impossible to accurately indicate the lifespan. In some cases, an odor sensor is installed downstream of the deodorizing filter and the life of the deodorizing filter is detected by inspecting the odor of the air that has passed through the deodorizing filter. Since it is not always possible to remove odor, it is necessary to also test the odor upstream of the deodorizing filter and compare and judge the odor concentration on the upstream and downstream sides.
This method requires two odor sensors and has problems such as the need to equalize their accuracy. OBJECT OF THE INVENTION Therefore, an object of the present invention is to more reliably display the life span of a deodorizing filter in accordance with the odor gas concentration and the amount of odor gas passing through. Structure of the Invention In order to achieve this object, the present invention detects the amount of odor gas passing through as the operating state of the fan (stopped, weakly operated, strongly operated) by a detection circuit, and sends the detected signal to a control circuit. Further, an odor sensor provided upstream of the deodorizing filter detects the odor gas concentration and sends the odor signal to the control circuit. The control circuit oscillates pulses according to the fan operating state and the odor concentration of the air being sucked in, integrates the pulses, and issues a signal when a value corresponding to the lifespan is reached. By receiving the signal from this control circuit, it is possible to display the lifespan of the deodorizing filter according to the odor concentration of the intake air when the fan is operating by turning on an indicator light or issuing an alarm. This is what I did. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In Fig. 2, 10 is a casing with a fan 12 inside and a dust collection filter 13 on the front side.
A deodorizing filter 14 is provided on the downstream side of this. 15 is a suction port of the casing 10, and 17 is a blowout port. Suction port 15 and dust collection filter 1
An odor sensor 16 is provided between 3 and 3. The odor sensor 16 is actually capable of detecting the concentration of cigarette smoke or a representative single odor component or a plurality of odor components for a certain odor, since there are actually many types of odor components and their concentrations are low. be.
Figure 3 shows the electrical circuit, and the plug 2
The motor 11 of the fan 12 is connected to both ends of the fan 12 via a switch 25. The switch 25 is connected to operate as shown in Table 1.

[Table] Relay in parallel with the switch 25 and motor 11
Connect B contacts R ₂₁ 26 and R _{31 27} (normally closed type) of relays R ₂ 22 and R ₃ 23 in series with R 1 21. Also, from the switches c and d of the switch 25, the motor 1
1, a relay R ₂ 22 and a relay R ₃ 23 are connected in parallel. Further, an A contact R ₄₂ 28 and an indicator light 29 are connected in parallel, and are connected to a control circuit 30 and a relay circuit 35 by a transformer 40. The control circuit 30 is composed of a power supply circuit 31, a pulse oscillation circuit 32, an integration circuit 33, and a comparison circuit 34. An odor sensor circuit 41 is connected to the oscillation circuit 32, and a relay is connected between the oscillation circuit 32 and the integration circuit 33.
A contact of R ₁ 21, R ₂ 22, R ₃ 23 R ₁₁ 36, R ₂₂
37 and R ₃₂ 38 are connected to each other. The comparison circuit 34 is connected to the relay circuit 35, and the A contact R ₄₂ 2 of the relay R ₄ 42 in the relay circuit 35
8 is configured to be connected in series to the indicator light 29 as described above. In the above configuration, when the switch 25 is conductive from a to b, the motor 11 is stopped and the fan 12
Since it does not rotate, there is no suction of air. On the other hand, the relay R ₁ 21 is energized and the A contact R ₁₁ 36 of the control circuit 30 is turned on. However, since the odor sensor 16 only detects odor in the vicinity, the odor sensor circuit 41, pulse oscillation circuit 32, and A contact R ₁₁
36, the number of pulses to the integration circuit 33 is small. When the switch 25 is conductive from a to c, the motor 11 performs a weak operation and air is sucked by the fan 12. At the same time, the relay R ₂ 22 is energized and the A contact R ₂₂ 37 of the control circuit 30 is turned on. Also B
Contact R ₂₁ 26 is turned OFF, and relay R ₁ 21 is de-energized. Similarly, if the switch 25 is conducting from a to d, the motor 11 is operated at high speed, and the relay R ₃
23 is excited, and the A contact R ₃₂ 38 of the control circuit 30 is
It becomes ON. Further, since the B contact R ₃₁ 27 is turned off, the relay R ₁ 21 is de-energized. As can be seen from the above, A contacts R ₁₁ 36,
R ₂₂ 37 and R ₃₂ 38 will be switched. In this way, relay R ₁ 21 is energized when the operation is stopped, relay R ₂ 22 is energized when the operation is weak, and relay R ₃ 23 is energized when the operation is strong. , each operating state is each relay
R1, R2, and R3 will be detected. Therefore, each relay R1, R2, and R3 corresponds to a detection circuit that detects the operating state. _Each contact in _the control circuit ₃₀ is
R ₁₁ , R ₂₂ , and R ₃₃ are switched, and the pulse signal from the pulse oscillation circuit 32 is sent to the integration circuit 33. The pulse oscillation circuit 32 oscillates a number of pulses according to the odor concentration detected by the odor sensor circuit 41, and
Integration circuit 3 depends on which of R ₁₁ , R ₂₂ , and R ₃₃ is turned on.
The number of pulses sent to 3 is changing. That is, the number of pulses obtained by multiplying the number of pulses corresponding to the odor concentration by a coefficient corresponding to the operating state is outputted from each of the contacts R ₁₁ , R ₂₂ , and R ₃₃ . The pulses are integrated in the integration circuit 33, and the integrated value is sent to the comparison circuit 34.
It is compared with the value K (deodorizing/load total amount) which is a guideline for the life of the deodorizing filter 14. When the value exceeds K, a signal is given to the display circuit 35. When a signal is given to the display circuit 35, the internal relay R ₄ 42 is energized, the A contact R ₄₂ 28 is turned on, and the indicator light 29 is turned on.
will be lit. FIG. 4 shows the operating state of the fan and changes in the integrated value in the integrating circuit. Therefore, the pulse signal of the pulse oscillation circuit 32 is changed according to the operating state of the fan (stopped, weakly operated, strongly operated), that is, the odor concentration of the sucked air, and the integration and comparison are performed in the integrating circuit 33 and the comparing circuit 34 to determine the lifespan (deodorization and When the total load amount is reached. In the display circuit 35, the A contact R ₄₂ 28 is turned ON, and the indicator light 29 is turned on, which turns on the deodorizing filter 1.
4 lifespan can be displayed more reliably. Effects of the Invention As is clear from the above explanation, the present invention pulse-integrates the deodorizing load amount of the deodorizing filter according to the operating state of the fan, that is, the amount of suction air, and the odor concentration of the suction air. Since the display means displays when the life time of the deodorizing filter reaches a predetermined value, it is less affected by the accuracy of the odor sensor, and it is possible to clearly and accurately know when the deodorizing filter has reached the end of its life. This allows the deodorizing filter to be replaced without waste.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional air cleaner, Figure 2 is a sectional view of an air cleaner according to an embodiment of the present invention, and Figure 3 is a sectional view of an air cleaner according to an embodiment of the present invention.
The figure is an electric circuit diagram of one embodiment of the air cleaner of the present invention, and FIG. 4 is a graph showing the relationship between the integrated value of the pulse integrating circuit and time in the operating state of one embodiment of the air cleaner of the present invention. . 5... Deodorizing filter, 16... Odor sensor, 21... Relay R ₁ , 22... Relay R ₂ , 2
3...Relay _R3 , 29...Indicator light, 30...Control circuit, 31...Power supply circuit, 32...Pulse oscillation circuit, 33...Integrator circuit, 34...Comparison circuit, 3
5...Display circuit (display means), 36, 37, 38
...A contact R ₁₁ , R ₂₂ , R ₃₂ , 28 ... A contact R ₄₂ ,
41...Sensor circuit, 42...Relay _R4 .

Claims (1)

[Claims] 1. A fan, a deodorizing filter that filters the air sucked by the fan, a detection circuit that detects the operating state of the fan, and a detection circuit that is provided upstream of the deodorizing filter to detect the odor concentration of the sucked air. an odor sensor that oscillates a number of pulses corresponding to the odor concentration detected by the odor sensor, and outputs a number of pulses obtained by multiplying this number of pulses by a coefficient corresponding to the operating state of the fan detected by the detection circuit, a controller that integrates the output pulse number and counts it as the deodorizing load amount of the deodorizing filter, and compares the pulse integrated amount with a predetermined value set in advance; A lifespan display device for a deodorizing filter, comprising a display means operated by a signal emitted from the controller when the deodorizing filter is activated.