JP7273657B2 - Blower - Google Patents

Description

The present invention relates to blowers.

In Patent Document 1, when outside air is taken into the room, a fan, a filter, and an ion generation unit that generates ions are provided in the air path through which the air passes, dust in the air is collected, and purified air is sent out. A blower is disclosed.

A fan uses, for example, a high-performance HEPA filter to collect dust in the air.

Japanese Patent Application Laid-Open No. 2017-53582 (published on March 16, 2017)

However, in the blower described above, although dust can be collected efficiently by using a high-performance filter, the price of the filter is high, which increases the cost of the device itself.

Therefore, in view of the above points, one aspect of the present invention provides a blower capable of improving collection of fine particles such as dust in the air while reducing the cost of the device itself.

(1) A blower according to an aspect of the present invention includes a fan that sucks air into an air passage and sends out the air from the air passage, and a coarse dust filter that collects fine particles in the air sucked into the air passage. a fine particle detection unit for detecting fine particles in the air; and control for controlling the fan so as to reduce the wind speed of the air passing through the coarse dust filter when the fine particle detection unit detects fine particles having a predetermined particle size or less. Department and prepare.

(2) In the blower according to one aspect of the present invention, the fine particles are PM2.5.

(3) The blower according to an aspect of the present invention further includes an ion generation section that generates ions in the air passage, and the ion generation section is provided upwind of the coarse dust filter.

(4) A blower according to an aspect of the present invention is a filter in which a coarse dust filter is electrically charged.

(5) A ventilation system according to an aspect of the present invention includes the blower described in (1) to (4) above.

It is a side cross-sectional view showing a case where the blower according to the present embodiment is applied to an electric cooking apparatus installed indoors. (a) It is a perspective view which shows an ion generation part. (b) It is a top view which shows an ion generation part. (a) It is a figure which shows an example of the flow of a process of the control part of an air blower. (b) It is a figure which shows an example of the other flow of a process of the control part of an air blower. FIG. 8 is a side cross-sectional view showing a case where the blower according to Embodiment 2 is applied to a vehicle; FIG. 11 is a side cross-sectional view showing a blower according to Embodiment 2; FIG. 4 is a diagram showing an experimental device for obtaining the dust collection rate of dust collected by a filter. (a) is a table showing the particle size of fine particles at a wind speed of 0.7 m/s and the collection rate when the ion generating section is on or off. (b) is a table showing the particle size of fine particles at a wind speed of 0.35 m/s and the collection rate when the ion generating section is on or off.

[Embodiment 1]
Embodiment 1 of the present disclosure will be described with reference to FIG. FIG. 1 is a side cross-sectional view showing a case where the blower according to this embodiment is applied to an electric cooking apparatus installed indoors.

As shown in FIG. 1, the electric cooking apparatus C is installed in a room R1 where cooking is performed. It has a ventilation part V for exhausting air and a blower 1 for sending outdoor air into the room.

The electromagnetic cooker D has a plurality of electromagnetic induction sections D1, D1 on a flat panel. The electromagnetic induction part D1 can heat a metal pot or the like by induction heating when energized.

The ventilation part V is arranged between the ceiling R and the side wall W above the electromagnetic cooker D. As shown in FIG. The ventilation unit V includes a substantially box-shaped ventilation main body V1 provided with a duct V2 for exhausting heat and air in the room R1 to the outdoor R2, and a ventilation fan V3 for supplying air provided in the duct V2 of the ventilation main body V1. ing.

The ventilation main body V1 is formed with a downward hood V4 so as to cover the electromagnetic cooker D. - 特許庁The duct V2 communicates with an intake opening V2-1 opening in the hood V4 at one end, and communicates with an exhaust opening V2-2 opening in the wall W at the other end.

The ventilation fan V3 is composed of, for example, a sirocco fan. The ventilation fan V3 may be composed of blades and an electric motor that drives the blades to rotate.

The blower 1 is a mechanism for purifying air such as the outdoor R2 and taking it into the indoor R1. The blower 1 includes a main body 2 provided therein with an air passage 3 for sending air sucked from the outdoor R2 to the indoor R1, a fan 4 for sucking air into the air passage 3 and sending out air from the air passage 3, and air A coarse dust filter 5 that collects particles in the air, a particle detector 6 that detects particles in the air, and a controller 8 that controls the fan 4 are provided.

The main body 2 is formed in a substantially box shape, the upper part of the main body 2 is arranged on the ceiling R, and the side part of the main body 2 is arranged on the wall W of the room R1. One end of the air passage 3 communicates with a first opening 11 opening on the side of the main body 2 , and the other end communicates with a second opening 12 opening on the wall W. As shown in FIG. In addition, the ventilation main body V1 is arranged at the lower part of the main body 2. As shown in FIG.

The fan 4 is, for example, a sirocco fan, and is provided on the second opening 12 side of the air passage 3 in the main body 2 . When the fan 4 rotates, the air of the outdoor R2 is sucked into the air passage through the second opening 12, and the air is sent from the first opening 11 into the indoor R1. Further, the fan 4 can vary the wind speed under the control of the controller 8 . It should be noted that the fan 4 may be composed of blades and a drive unit that drives the blades to rotate.

The coarse dust filter 5 collects fine particles in the air of the outdoor R2 supplied by the fan 4, and is made of, for example, a flat or pleated nonwoven fabric. Specifically, the coarse dust filter 5 is a filter that collects fine particles having a particle size larger than 5 μm. In addition, the coarse dust filter 5 has a gravimetric collection efficiency of 85% or less, a dust retention capacity of 500 g/m ² to 2000 g/m ² , and a pressure loss of 3 mmH ₂ O to 20 mmH ₂ O (JIS B9908 : 1976 Type 3) of air filter units for ventilation. The coarse dust filter 5 is provided in the first opening 11 on the air blowing side of the air passage 3 . For example, a nonwoven fabric may be used by stacking a plurality of sheets. In an experimental example to be described later, two nonwoven fabrics are stacked and used as the coarse dust filter 5 .

Further, the coarse dust filter 5 may be composed of an electrified filter. The coarse dust filter 5 can be charged with ions generated by an ion generator 7, which will be described later. By configuring the coarse dust filter 5 with an electrified filter in this manner, it is possible to improve collection of fine particles and purify the air. Note that the coarse dust filter 5 may be a filter that is made of a porous filter material made of non-woven fabric and that is positively charged in advance.

The fine particle detector 6 is provided in the middle of the air passage 3 of the blower 1 . Specifically, a fine particle detector 6 is provided between the ion generator 7 and the fan 4 provided in the air passage 3 . The particle detection unit 6 detects particles in the outdoor air having a predetermined particle size or smaller, for example, particulate matter 2.5 (PM2.5). The detection result of the fine particle detection unit 6 is transmitted to the control unit 8 . In addition, the fine particle detection part 6 may detect the density|concentration of microparticulate matter PM2.5. Alternatively, the particle detector 6 may detect the concentration of particulate matter 10 (PM10) or other particles. Alternatively, the particle detection unit 6 receives particle size data or concentration data of particles from an external device without directly detecting the particle size or concentration of the particles. may indirectly sense the particle size or concentration of particulates present in the . For example, the fine particle detection unit 6 does not have to be provided in the air passage of the blower 1, and acquires concentration data of fine particulate matter PM2.5 provided by the Japan Meteorological Agency and transmits it to the control unit 8. Alternatively, detection result data of a particle detection sensor installed in the same space as the blower 1 may be acquired and transmitted to the control unit 8 . The fine particles having a predetermined particle size or less are preferably PM2.5 having a particle size of about 2.5 μm or less. More preferably, the predetermined particle size is about 1.0 μm or less.

The control unit 8 can receive the signal detected by the fine particle detection unit 6 and control the rotation speed of the fan 4 to adjust the amount of air supplied to the room R1. Specifically, the control unit 8 can control the fan 4 so as to reduce the wind speed of the air passing through the coarse dust filter 5 when the fine particle detection unit 6 detects fine particles having a predetermined particle size or less. The controller 8 can also control an ion generator 7 (see FIG. 2), which will be described later.

Although the speed of the air is lowered by changing the number of revolutions of the fan, an open/close damper (not shown) may be provided at least one of the inlet and outlet of the air passage. For example, by adjusting the amount of opening/closing of the opening/closing damper, the low opening/closing damper may be opened to reduce the wind speed when fine particles having a predetermined particle size or less are detected. By providing such an opening/closing damper, it is possible to control the wind speed while keeping the rotation speed of the fan constant. Further, the fan speed control and the opening/closing control of the opening/closing damper may be cooperated to control the wind speed. As the structure of such an opening/closing damper, a slide structure, a shaft rotation structure, or the like can be appropriately applied.

Furthermore, an ion generator 7 for generating ions is provided in the middle of the air passage 3 inside the main body 2 . The ion generator 7 is provided close to the windward side of the coarse dust filter 5 . The ion generator 7 generates, for example, negative ions and positive ions and emits them into the air passage 3 .

FIG. 2(a) is a perspective view showing the ion generating section 7. FIG. FIG. 2B is a plan view showing the ion generating section 7. FIG.

The ion generating unit 7 includes, for example, a substantially elongated box-shaped housing 20, a positive electrode 21 and a negative electrode 22 that project from openings 20a and 20b in the upper portion of the housing 20 and generate discharge, and each discharge electrode. , and induction electrodes 23 and 24 provided on the peripheries of the openings 20a and 20b.

Gate-shaped frames 25 and 25 for preventing contact with the positive electrode 21 and the negative electrode 22 are provided at the ends of the upper portion of the housing 20 in the longitudinal direction, respectively. The discharge electrodes (the positive electrode 21 and the negative electrode 22) and the induction electrodes 23 and 24 of the ion generating section 7 are connected to the control section 8 and discharge-controlled.

The positive electrode 21 and the negative electrode 22 are formed, for example, in a substantially brush shape by bundling a plurality of filamentous conductors, and the lower part thereof is fixed inside the housing 20 . In addition, the positive electrode 21 and the negative electrode 22 may have, for example, a substantially needle-shaped configuration.

Since the ion generating part 7 having the brush-like electrode has an increased area of the region for generating positive and negative ions, it is possible to increase the amount of ions generated when the same voltage is applied, compared to the needle-like electrode. can be done.

In the ion generating section 7, when a positive high voltage pulse is applied to the positive electrode 21 of one discharge electrode and a negative high voltage pulse is applied to the negative electrode 22 of the other discharge electrode, the tips of the positive electrode 21 and the negative electrode 22 of the same discharge electrode , a corona discharge occurs, generating positive and negative ions.

A positive ion is a cluster ion in which a plurality of water molecules are clustered around a hydrogen ion (H ⁺ ), and is represented by H ⁺ (H ₂ O) _m (m is any integer equal to or greater than 0). Negative ions are cluster ions in which a plurality of water molecules are clustered around oxygen ions (O ₂ ⁻ ) and are represented by O ₂ ⁻ (H ₂ O) _n (n is any integer equal to or greater than 0).

Also, when positive ions and negative ions are released into the air, both ions surround fungi and viruses floating in the air and cause chemical reactions with each other on their surfaces. Floating fungi and the like are removed by the action of hydroxyl radicals (.OH), which are discharge products generated at that time.

The ion generator 7 generates discharge products such as electrons, ions, radicals, and ozone in the air by discharging.

The ion generator 7 emits both negative ions and positive ions into the air passage 3 . Although the ion generating section 7 is configured to generate two types of ions, it may be configured to generate either positive or negative ions. The ion generator 7 may mainly emit only ions having the polarity opposite to that of the coarse dust filter 5 into the air passage 3 . For example, when the coarse dust filter 5 is positively charged in advance, the ion generator 7 may mainly emit only negative ions into the air passage 3 .

Next, an example of the flow of processing in the controller of the blower according to this embodiment will be described. FIG. 3A is a diagram showing an example of the flow of processing by the controller of the blower according to the present embodiment.

When the fan 4 (see, for example, FIG. 1) is driven, the air of the outdoor room R2 is taken into the air passage 3 from the second opening 12 at a predetermined air volume, ventilates the inside of the air passage 3, and the first It is delivered from the opening 11 into the room R1. Further, when the fan 4 is driven, the ion generator 7 and the particle detector 6 are also driven. The ion generator 7 generates ions in the air passage 3, and for example, negative ions and positive ions are emitted into the air passage 3. As a result, the negative ions and positive ions in the air passage 3 negatively and/or positively charge the particulate PM2.5 contained in the outdoor R2 air in the air passage 3 . Also, negative ions or positive ions are sent to the coarse dust filter 5 on the leeward side to charge the coarse dust filter 5 negatively and/or positively.

As shown in FIG. 3( a ), the fine particle detection unit 6 in the air passage 3 detects, for example, PM 2.5, which is fine particles having a predetermined particle size or less contained in the air of the outdoor R2, and the control unit 8 Send a detection signal. The control unit 8 determines whether or not the detection signal of the fine particle detection unit 6 has been acquired (S101).

Next, when the detection signal is acquired (S101 YES), the control unit 8 proceeds to S102. If the control unit 8 does not acquire the detection signal (S101 NO), the processing of the flow ends.

The controller 8 performs control to reduce the wind speed generated by the fan 4 (S102). Fine particles of PM 2.5 carried along with the gentle air supply are air-supplied to the leeward side in the air passage 3 , and fine particles having a particle size of 0.3 μm or more and 1.0 μm or less are collected by the coarse dust filter 5 . Therefore, according to the blower 1 of the present embodiment, for example, as shown in Examples described later, a high-performance filter with a high particle dust collection rate, for example, fine particles with a particle size of 0.3 μm or more and 1.0 μm or less can be collected. Fine dust, pollen, etc. contained in the air flowing through the air passage 3 can be efficiently collected by the coarse dust filter 5 without using a HEPA filter or the like. Moreover, according to the air blower 1 of this embodiment, it is possible to suppress an increase in the cost of the device itself.

Moreover, since the ion generating section 7 is provided on the windward side of the coarse dust filter 5, the PM2.5 fine particles charged positively or negatively by the ion generating section 7 are sent to the leeward side in the air passage 3, and ionized. Dust can be efficiently collected to the coarse dust filter 5 that is negatively or positively charged by the generator 7 .

[Embodiment 2]
Embodiment 2 of the present disclosure will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a side cross-sectional view showing a case where the blower according to the second embodiment is applied to a vehicle. FIG. 5 is a side cross-sectional view showing the blower according to the second embodiment. For convenience of explanation, in the second embodiment, the same reference numerals are assigned to the same functions as those in the first embodiment, and redundant explanations are omitted.

As shown in FIG. 4, the vehicle 101 is partitioned into an engine room 104, an equipment room 105 and a passenger compartment . The engine room 104 and the equipment room 105 are separated by a partition wall 107, and the equipment room 105 and the vehicle room 106 are separated by an instrument panel 108 or the like.

The engine room 104 accommodates an engine (not shown) and a radiator (not shown) in a predetermined space, and is covered with a bonnet 103 . The cabin 106 is a space that accommodates passengers. A plurality of seats S, . . .

Vehicle 101 also includes blower 31 for sending air into passenger compartment 106 . As shown in FIG. 5, the blower 31 includes a main body 32 arranged in the equipment room 104 (see FIG. 4), a fan 34 arranged in an air passage 33 provided in the main body 32, a coarse dust filter 5, It has a particle detection unit 6 and an ion generation unit 7 , and further has a control unit 38 .

The air passage 33 of the main body 32 has a first opening 41 for sending air into the vehicle, and a first opening 41 for drawing in air R4 outside the vehicle (see FIG. 4, for example) and R3 inside the vehicle (see FIG. 4, for example). It has an open second opening 42 and a third opening 43 . The second opening 42 communicates with the outside of the vehicle 101 and sucks the air outside the vehicle R4 into the air passage 33 . The third opening 43 communicates with the passenger compartment 106 and sucks the air inside the passenger compartment 106 into the air passage 33 . The first opening 41 communicates with the passenger compartment 106 and blows out the conditioned air into the passenger compartment.

In the air passage 33, from the second opening 42 or the third opening 43 toward the first opening 41 (from the upstream side to the downstream side in the air flow direction), the switching damper 30, the fine particles A detector 6, an ion generator 7, a coarse dust filter 5, a fan 34, an evaporator 35, and a heater core 36 are arranged in this order.

The switching damper 30 selectively opens the second opening 42 for sucking the air outside the vehicle R4 and the third opening 43 for sucking the air inside the vehicle R3, so that the air outside the vehicle R4 and the air inside the vehicle R3 are opened. air intake switching.

The fine particle detector 6 is provided in the air passage 33 of the blower 31 . Specifically, the fine particle detector 6 is provided between the ion generator 7 and the switching damper 30 provided in the air passage 33 . The fine particle detection unit 6 detects the concentration of, for example, fine particulate matter 2.5 (PM2.5) in outdoor air by a light scattering method. The detection result of the fine particle detection unit 6 is transmitted to the control unit 38 . The controller 38 controls the air volume of the fan 34 based on the detection result of the fine particle detector 6 .

Furthermore, an ion generator 7 for generating ions is provided in the middle of the air passage 33 inside the main body 2 . Specifically, the ion generating section 7 is provided between the fine particle detection section 6 and the coarse dust filter 5 in the air passage 33 so as to be close to the coarse dust filter 5 . The ion generator 7 generates, for example, negative ions and positive ions and discharges them into the air passage 33 during cooling operation, heating operation, and air blowing operation. In this way, the ion generator 7 generates both negative ions and positive ions and discharges them into the air passage 33, so that the fine particles are negatively charged and the coarse dust filter 5 is positively charged. . In addition, it is possible to eliminate bacteria, inactivate viruses, and remove odors in the passenger compartment 106 .

Note that the ion generator 7 may mainly emit ions having a polarity opposite to that of the rough dust filter 5 into the air passage 33 . The ion generating section 7 mainly emits only negative ions into the air passage 33, while the coarse dust filter 5 may be positively charged in advance, for example.

The coarse dust filter 5 purifies the air inside the vehicle R3 and outside the vehicle R4 supplied by the fan 34, and has the same configuration as that of the first embodiment. The coarse dust filter 5 is provided between the ion generator 7 and the fan 34 in the air passage 33 .

The fan 34 is composed of, for example, a sirocco fan, and is provided between the coarse dust filter 5 and the evaporator 35 in the air passage 33 . By driving the fan 34, air outside the vehicle R4 or air inside the vehicle R3 is taken into the air passage 33 from the second opening 42 or the third opening 43, and flows into the air passage 33 toward the first opening 41. An air current is generated.

The evaporator 35 is arranged on the downstream side of the fan 34 and is formed by joining a plurality of fins (not shown) to a refrigerant pipe (not shown) through which refrigerant flows. The evaporator 35 is connected to a compressor (not shown) that operates a refrigerating cycle, and when power is transmitted from the engine to the compressor via a V-belt (not shown), refrigerant flows through the refrigerant pipe. As a result, while the refrigerant evaporates in the evaporator 35, the air flowing between the fins is cooled by endothermic cooling operation.

The heater core 36 is formed by joining a plurality of fins to a corrugated tube (not shown) arranged in parallel with a radiator through which cooling water of the engine flows. Heating operation is performed by circulating the cooling water heated by the engine through the corrugated tube to heat the air circulating between the fins. In addition, by blocking power transmission from the engine to the compressor and blocking circulation of cooling water to the corrugated tube of the heater core 36, air blowing operation is performed.

A display unit (not shown) composed of a plurality of operation switches (not shown) and a plurality of indicators (not shown) is provided on the instrument panel 108 . A user can switch between the cooling operation, the heating operation, and the blowing operation by operating the operation switch. Also, each indicator lights up to notify cooling operation, heating operation, or air blowing operation.

Next, an example of the flow of processing in the controller of the blower according to this embodiment will be described. The processing flow of the controller of the blower will be described with reference to FIG. 3 described above. When the engine of the vehicle 101 is started, the operation switch is operated to select, for example, the blowing operation, and the switching damper 30 opens the second opening 42 and closes the third opening 43 .

When the fan 34 (see, for example, FIG. 5) is driven, the air outside the vehicle R4 is taken into the air passage 33 from the second opening 42 at a predetermined air volume, ventilates the inside of the air passage 33, and the first air flows. It is delivered into the compartment 106 through the opening 41 . Further, when the fan 4 is driven, the ion generator 7 and the particle detector 6 are also driven. The ion generator 7 generates ions in the air passage 33, and mainly negative ions are emitted into the air passage 33, for example. As a result, negative ions are mainly emitted into the air passage 33, and PM2.5 particles contained in the air outside the vehicle R4 in the air passage 33 are negatively charged. Also, positive ions are sent to the coarse dust filter 5 on the leeward side, and the coarse dust filter 5 is positively charged.

As shown in FIG. 3( a ), the fine particle detection unit 6 in the air passage 33 detects fine particles having a predetermined particle size or less, such as PM 2.5, contained in the air outside the vehicle R<b>2 . Send a detection signal. The control unit 38 determines whether or not the detection signal of the particle detection unit 6 has been acquired (S101).

Next, when the detection signal is acquired (S101 YES), the control unit 38 proceeds to S102. If the control unit 8 does not acquire the detection signal (S101 NO), the processing of the flow ends.

The controller 38 performs control to reduce the wind speed generated by the fan 4 (S10). Fine particles of PM 2.5 carried along with the gentle air supply are air-supplied to the leeward side in the air passage 33 , and fine particles having a particle size of 0.3 μm or more and 1.0 μm or less are collected by the coarse dust filter 5 . Therefore, according to the air blower 31 of this embodiment, the same effects as those of the first embodiment can be obtained.

Although the speed of the air was lowered by changing the number of rotations of the fan, at least one of the first, second, and third openings of the air passage was equipped with a An opening/closing damper (not shown) may be provided. For example, by adjusting the opening/closing amount of such an opening/closing damper, when the fine particles are higher than a predetermined value, the opening/closing damper may be opened compared to when the fine particles are low, thereby lowering the wind speed. By providing such an opening/closing damper, it is possible to control the wind speed while keeping the rotation speed of the fan constant. Further, the fan speed control and the opening/closing control of the opening/closing damper may be cooperated to control the wind speed. As the structure of such an opening/closing damper, a slide structure, a shaft rotation structure, or the like can be appropriately applied.

Although the fine particle detector 6 is provided in the air passage 33, it may be provided in the instrument panel 108 inside the vehicle 106. FIG.

Note that in the case of cooling operation, the compressor circulates the refrigerant in the circulation flow path, and the refrigerant flows into the evaporator 35 . The air that has passed through the evaporator 35 is cooled, and cool air is sent into the vehicle interior 106 through the first opening 41 . When the heating operation or the air blowing operation is performed, the switching damper 31 closes the second opening 42 for sucking outside air and opens the third opening 43 to circulate the inside air. When the fine particle detector 6 detects PM2.5 contained in the fine particles, the air flow rate of the fan 34 is reduced and the coarse dust filter 5 can efficiently collect the dust.

Although the particle detection unit 6 in each of the above-described embodiments detects particles having a predetermined particle size or less, it may detect the amount (concentration) of particles. It may be one that detects both the diameter and the amount of fine particles. Specifically, the particle detection unit detects the amount (concentration) of particles and transmits the detection signal to the control unit. Next, as shown in FIG. 3B, when the control unit acquires the detection signal (S201), it determines whether PM2.5 of the detected fine particles is a predetermined value (for example, 20 μg/m ³ ) or more. is determined (S202). If PM2.5 of fine particles in the air is equal to or higher than the predetermined value (S202 YES), the process proceeds to S203. If the PM2.5 of fine particles in the air is less than the predetermined value (S202 NO), the processing of the flow is terminated. The controller 8 performs control to reduce the wind speed generated by the fan 4 (S203). Fine particles of PM2.5 carried along with the gentle air supply are sent to the leeward side in the air passage 3, and fine particles having a particle size of 0.3 μm or more and 1.0 μm or less can be collected by the coarse dust filter 5. .

Furthermore, the ventilation system may include the blower of each embodiment described above. The ventilation system of the present disclosure includes at least a fan that sucks air into an air passage and sends out the air from the air passage, a coarse dust filter that collects fine particles in the air sucked into the air passage, and fine particles in the air. and a control unit that controls the fan so as to reduce the wind speed of the air passing through the coarse dust filter when the fine particle detection unit detects fine particles of a predetermined particle size or less. , is installed in the space above the ceiling of the building, and can purify and supply the air taken in from the outside to each room in the building. In the configuration of the coarse dust filter of the conventional ventilation system, fine particles such as PM2.5 could not be captured and were taken into the room. Moreover, if the ventilation system itself performs ventilation 24 hours a day, it is necessary to use an expensive HEPA filter to constantly filter fine particles in the outside air. It is very uneconomical because it becomes dirty and the performance of capturing fine particles deteriorates, and the frequency of replacement of the filter increases. According to such a ventilation system, fine particles can be effectively captured by an inexpensive coarse dust filter without using an expensive HEPA filter, so the price of the system itself can be reduced, and maintenance costs associated with filter replacement can be reduced. can also be suppressed. The ventilation system can be applied to kitchen ducts, vehicle ducts, residential ventilation ducts such as buildings, bathroom ducts, and the like.

[Experimental example]
FIG. 6 shows an experimental apparatus for obtaining the collection rate of dust collected by a coarse dust filter according to changes in air volume of a fan. FIG. 7(a) is a table showing the particle size of fine particles at a wind speed of 0.7 m/s, the collection rate when the ion generator (PCI) is on or off, and the difference in the collection rate. FIG. 7(b) is a table showing the particle size of fine particles at a wind speed of 0.35 m/s, the collection rate when the ion generating section (PCI) is on or off, and the difference in the collection rate.

As shown in FIG. 6, the experimental device is provided with a coarse dust filter in the center and a fan for generating an air flow on the side. An ion generator (hereinafter referred to as PCI) is arranged on the windward side of the coarse dust filter. Fine particles emitted in the vicinity of the fan are referred to as dust A, and fine particles that have passed through the coarse dust filter are referred to as dust B.

The formula for the collection rate can be expressed as follows.
Collection rate (%) = (number concentration of dust A - number concentration of dust B) / (number concentration of dust A) x 100%

As the coarse dust filter, two nonwoven fabrics (thickness: t=10 mm×2 sheets) are piled up and used. As shown in FIG. 7(a), the collection rate is 23.21% when the wind speed is 0.7 m/s, the particle size is 0.3 μm, and PCI (OFF) is used. On the other hand, as shown in FIG. 8(b), when the wind speed is 0.35 m/s, the particle diameter of the fine particles is 0.3 μm, and PCI (OFF) is used, the collection efficiency is 36.64%. Thus, it became clear that the collection rate was increased by lowering the wind speed of the fan from 0.7 m/s to 0.35 m/s, and similar effects were confirmed for other particle sizes.

Next, as shown in FIG. 7(a), the collection rate is 29.55% in the case of PCI (ON) with a fine particle diameter of 0.3 μm at a wind speed of 0.7 m/s. On the other hand, at a wind speed of 0.35 m/s, the collection rate is 58.09% in the case of PCI (ON) with a particle size of 0.3 μm. In this way, by turning on PCI and lowering the wind speed of the fan from 0.7 m / s to 0.35 m / s, the effect of further increasing the collection rate becomes clear, and the same is true for other particle sizes The effect can be confirmed.

In the experimental example, it can be confirmed that even fine particles with particle sizes that are difficult to be collected by the coarse dust filter 5 can be effectively collected by lowering the wind speed. Furthermore, when the PCI is turned on, the effect of increasing the collection rate can be confirmed.

The ion generating section may have a plurality of positive electrodes and negative electrodes as discharge electrodes. Also, a plurality of induction electrodes may be provided.

In the above embodiment, as an example, mainly the case where the blower is attached to an electric cooking device or a vehicle has been described, but the blower in the above can be, for example, a dehumidifier, a humidifier, an air cleaner, an air conditioner, or a deodorizer. You may attach it to electronic equipments, such as a machine, a refrigerator, a vacuum cleaner, and cooking appliances.

The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. is also included in the technical scope of the present invention.

C Electric cooking device D Electromagnetic cooker V Ventilation units 1, 31 Blowers 2, 32 Main bodies 3, 33 Air paths 4, 34 Fan 5 Coarse dust filter 6 Fine particle detection unit 7 Ion generation units 8, 38 Control unit 11 First opening Part 12 Second opening 20 Case 21 Positive electrode 22 Negative electrode 23 Induction electrode 24 Induction electrode 25 Portal frame 30 Switching damper 35 Evaporator 36 Heater core

Claims (5)

a fan that draws air into an air passage and expels the air from the air passage;
a coarse dust filter that collects fine particles in the air sucked into the air passage;
a particle detector that detects particles in the air;
a control unit that controls the fan so as to reduce the wind speed of the air passing through the coarse dust filter when the fine particle detection unit detects fine particles having a predetermined particle size or less;
A blower. The fine particles are PM2.5,
The blower according to claim 1. Furthermore, an ion generation unit that generates ions in the air passage is provided,
The ion generator is provided on the windward side of the coarse dust filter,
The fan according to claim 1 or 2. A coarse dust filter is an electrically charged filter,
The blower according to claim 3. A ventilation system comprising the blower according to any one of claims 1 to 4.

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