JP2021032423A - Air blower - Google Patents

Abstract

To solve the problem that when a high-quality filter is used in order to collect dust of an air blower efficiently, a price of the high-quality filter is high, so that a cost of the air blower itself becomes high.SOLUTION: An air blower comprises: a fan that suctions 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 suctioned into the air passage; a particle detection unit that detects the fine particles in the air; and a control unit that when the fine particle detection unit detects fine particles having a predetermined particle size or less, controls the fan so as to reduce the wind speed of air passing through the coarse dust filter.SELECTED DRAWING: Figure 1

Description

The present invention relates to a blower.

In Patent Document 1, when the outside air is taken into a room, a fan, a filter, and an ion generating portion for generating ions are provided in the air passage through which the air passes, dust in the air is collected, and purified air is sent out. The blower to be used is disclosed.

In the blower, for example, a high-performance HEPA filter is used to collect dust in the air.

Japanese Unexamined Patent Publication No. 2017-53582 (published on March 16, 2017)

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

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

(1) The blower according to one aspect of the present invention is a fan that sucks air into the 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 that detects fine particles in the air, and a control that controls the fan so as to reduce the wind speed of air passing through the coarse dust filter when the fine particle detection unit detects fine particles having a predetermined particle size or less. Prepare with the department.

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

(3) The blower according to one aspect of the present invention further includes an ion generating section for generating ions in the air passage, and the ion generating section is provided on the windward side of the coarse dust filter.

(4) The blower according to one aspect of the present invention is a filter charged with a coarse dust filter.

(5) The ventilation system according to one aspect of the present invention includes the blower according to the above (1) to (4).

It is a side sectional view which shows the case where the blower which concerns on this embodiment is applied to the electric cooking apparatus installed in a room. (A) It is a perspective view which shows the ion generation part. (B) It is a top view which shows the ion generation part. (A) It is a figure which shows an example of the processing flow of the control part of a blower. (B) It is a figure which shows an example of another flow of processing of the control part of a blower. It is a side sectional view which shows the case where the blower which concerns on this Embodiment 2 is applied to a vehicle. It is a side sectional view which shows the blower which concerns on this Embodiment 2. It is a figure which shows the experimental apparatus for obtaining the collection rate of the dust collected by a filter. (A) It is a table which shows the particle size of fine particles at a wind speed of 0.7 m / s, and the collection rate at the time of turning on or off of an ion generating part. (B) It is a table which shows the particle size of fine particles at a wind speed of 0.35 m / s, and the collection rate at the time of turning on or off of an ion generating part.

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

As shown in FIG. 1, the electric cooking device C is installed in the indoor R1 for cooking, and the electromagnetic cooker D for heating a pot or the like and the heat or air generated by the heating are transferred from the indoor R1 to the outdoor R2. It is provided with a ventilation unit V for exhausting and a blower 1 for blowing outdoor air into the room.

The electromagnetic cooker D is provided with a plurality of electromagnetic induction portions D1 and D1 on a flat panel. When the electromagnetic induction unit D1 is energized, it can heat a metal pot or the like by induction heating.

The ventilation unit V is arranged between the ceiling R above the electromagnetic cooker D and the side wall W. The ventilation unit V includes a substantially box-shaped ventilation main body V1 provided with a duct V2 for exhausting heat and air from the indoor 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. The duct V2 communicates with an intake opening V2-1 that opens one end to the hood V4, and communicates with an exhaust opening V2-2 that opens the other end to the wall W.

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 rotationally drives the blades.

The blower 1 is a mechanism for purifying the air such as the outdoor R2 and taking it into the indoor R1. The blower 1 includes a main body 2 provided 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 air from the air passage 3, and air. A coarse dust filter 5 for collecting fine particles in the air, a fine particle detection unit 6 for detecting fine particles in the air, and a control unit 8 for controlling the fan 4 are provided.

The main body 2 is formed in a substantially box shape, the upper portion of the main body 2 is arranged on the ceiling R, and the side portion of the main body 2 is arranged on the wall portion W of the indoor R1. The air passage 3 communicates with one end of the first opening 11 that opens to the side of the main body 2 and the other end of the air passage 3 with a second opening 12 that opens into the wall W. Further, the ventilation main body V1 is arranged in the lower part of the main body 2.

The fan 4 is composed of, for example, a sirocco fan, and is provided on the side of the second opening 12 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 to the indoor R1. Further, the fan 4 can change the wind speed under the control of the control unit 8. The fan 4 may be composed of a blade and a drive unit that rotationally drives the blade.

The coarse dust filter 5 collects fine particles in the air of the outdoor R2 sent by the fan 4, and is made of, for example, a flat or pleated non-woven fabric. Specifically, the coarse dust filter 5 is a filter that collects fine particles having a particle size larger than 5 μm. The coarse dust filter 5 has a collection efficiency of 85% or less by the gravimetric method, a dust holding 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 Ventilation air filter unit type 3). 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 plurality of non-woven fabrics may be stacked and used. In the experimental example described later, two non-woven fabrics are stacked and used as the coarse dust filter 5.

Further, the coarse dust filter 5 may be composed of a charged filter. The coarse dust filter 5 can be charged with ions generated by the ion generating unit 7, which will be described later. By forming the coarse dust filter 5 with a charging filter in this way, it is possible to improve the collection of fine particles and purify the air. The coarse dust filter 5 may be, for example, a filter in which a non-woven fabric is made of a porous filter material and is positively charged in advance.

The fine particle detection unit 6 is provided in the middle of the air passage 3 of the blower 1. Specifically, a fine particle detection unit 6 is provided between the ion generation unit 7 provided in the air passage 3 and the fan 4. The fine particle detection unit 6 detects fine particles having a predetermined particle size or less in the outdoor air, for example, fine particulate matter PM2.5 (particulate matter 2.5). The detection result of the fine particle detection unit 6 is transmitted to the control unit 8. The fine particle detection unit 6 may detect the concentration of the fine particulate matter PM2.5. Alternatively, the fine particle detection unit 6 may detect the concentration of the fine particulate matter PM10 (particulate matter 10) or other fine particles. Alternatively, the fine particle detection unit 6 receives the particle size data or concentration data of the fine particles from an external device without directly detecting the particle size or concentration of the fine particles, so that the periphery of the blower 1 (particularly near the suction port). The particle size or concentration of the fine particles present in the water may be indirectly detected. For example, the fine particle detection unit 6 does not have to be provided in the air passage of the blower 1, and acquires the concentration data of the fine particle substance PM2.5 provided by the Japan Meteorological Agency and transmits it to the control unit 8. Alternatively, the detection result data of the fine 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 particle size of about 2.5 μm or less are preferably PM2.5 having a particle size of about 2.5 μm or less. Further, it is more preferable that 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 sent 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. In addition, the control unit 8 can control the ion generation unit 7 (see FIG. 2), which will be described later.

Although the number of rotations of the fan is changed to reduce the air speed, an opening / closing damper (not shown) may be provided at at least one of the inlet and the outlet of the air passage. For example, by adjusting the opening / closing amount of the opening / closing damper, when fine particles having a predetermined particle size or less are detected, the low opening / closing damper may be opened to reduce the wind speed. By providing such an opening / closing damper, the wind speed can be controlled while keeping the rotation speed of the fan constant. Further, the wind speed may be controlled in cooperation with the rotation speed control of the fan and the opening / closing control of the opening / closing damper. As the structure of the opening / closing damper, a sliding structure, a shaft rotating structure, or the like can be appropriately applied.

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

FIG. 2A is a perspective view showing the ion generating unit 7. FIG. 2B is a plan view showing the ion generating unit 7.

The ion generating portion 7 includes, for example, a substantially elongated box-shaped housing 20, a positive electrode 21 and a negative electrode 22 of a discharge electrode that protrude from the openings 20a and 20b at the top of the housing 20 to generate a discharge, and each discharge electrode. Each guide electrode 23, 24 is provided on the peripheral edge of each of the openings 20a, 20b.

Further, at the end of the upper portion of the housing 20 in the longitudinal direction, portal frames 25 and 25 for preventing contact with the positive electrode 21 and the negative electrode 22 are provided, respectively. The discharge electrodes (positive electrode 21, negative electrode 22) and induction electrodes 23 and 24 of the ion generation unit 7 are connected to the control unit 8 to control the discharge.

The positive electrode 21 and the negative electrode 22 are formed, for example, in a substantially brush shape in which a plurality of thread-like conductors are bundled, and the lower portion thereof is fixed in the housing 20. The positive electrode 21 and the negative electrode 22 may have a substantially needle-shaped structure, for example.

Since the area of the region where positive and negative ions are generated is increased in the ion generating unit 7 provided with the brush-shaped electrode, the amount of ions generated when the same voltage is applied is increased as compared with the needle-shaped electrode. Can be done.

In the ion generation unit 7, when a positive high-pressure pulse is applied to the positive electrode 21 of one discharge electrode and a negative high-pressure pulse is applied to the other negative electrode 22, the positive electrode 21 and the tip of the negative electrode 22 of the same discharge electrode are applied. Then, a corona discharge is generated, and positive ions and negative ions are generated.

The positive ion is a cluster ion in which a plurality of water molecules are clustered around a hydrogen ion (H ^{+ ), and is represented as H +} (H ₂ O) _m (m is an arbitrary integer of 0 or more). Negative ions, oxygen ions _{(O 2} ^-) a plurality of water molecules around the are clustered cluster _{^{ions, O 2 - (H 2 O}} ) n (n is 0 or an arbitrary integer) is expressed as.

When positive and negative ions are released into the air, both ions surround the fungi and viruses floating in the air and cause a chemical reaction with each other on the surface. Airborne fungi and the like are removed by the action of hydroxyl radicals (.OH) of the discharge product generated at that time.

The ion generation unit 7 generates discharge products such as electrons, ions, radicals, and ozone in the air by electric discharge.

The ion generation unit 7 releases both negative ions and positive ions into the air passage 3. Although the ion generating unit 7 is configured to generate two types of ions, it may be configured to generate either positive or negative ions. The ion generation unit 7 may mainly emit only ions having the opposite polarity to 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 generating unit 7 may mainly discharge only negative ions into the air passage 3.

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

When the fan 4 (see, for example, FIG. 1) is driven, the air of the outdoor R2 is taken into the air passage 3 through the second opening 12 with a predetermined air volume, and is ventilated in the air passage 3 to be ventilated in the first air passage 3. It is sent out from the opening 11 into the room R1. Further, the ion generation unit 7 and the fine particle detection unit 6 are also driven together with the drive of the fan 4. The ion generation unit 7 generates ions in the air passage 3, and for example, negative ions and positive ions are released into the air passage 3. As a result, the negative ions and positive ions in the air passage 3 negatively and / or positively charge PM2.5 of the fine particles contained in the air of the outdoor R2 in the air passage 3. Further, negative ions or positive ions are sent to the leeward coarse dust filter 5 to charge the coarse dust filter 5 negatively and / or positively.

As shown in FIG. 3A, the fine particle detection unit 6 in the air passage 3 detects, for example, PM2.5, which is fine particles having a predetermined particle size or less contained in the air of the outdoor R2, and causes the control unit 8 to detect the fine particles, for example, PM2.5. 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 control unit 8 acquires the detection signal (S101 YES), the control unit 8 proceeds to S102. If the control unit 8 does not acquire the detection signal (S101 NO), the flow process ends.

The control unit 8 controls to reduce the wind speed generated by the fan 4 (S102). PM2.5 of fine particles carried with gentle air supply is 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 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 highly functional filter having a high particle dust collection rate, for example, fine particles having a particle size of 0.3 μm or more and 1.0 μm or less is collected. It is possible to efficiently collect fine particle dust, pollen, etc. contained in the air flowing in the air passage 3 by the coarse dust filter 5 without using a HEPA filter or the like. Further, according to the blower 1 of the present 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 of the fine particles positively or negatively charged by the ion generating section 7 is sent to the leeward side in the air passage 3 to generate ions. Dust can be efficiently collected in the coarse dust filter 5 which is negatively or positively charged by the generating unit 7.

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

As shown in FIG. 4, the vehicle 101 is divided into an engine room 104, an equipment room 105, and a vehicle room 106. The engine room 104 and the equipment room 105 are separated by a partition wall 107, and the equipment room 105 and the vehicle interior 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 covers the upper surface with a bonnet 103. The passenger compartment 106 is a space for accommodating occupants. A plurality of seats S, ..., S are arranged in the passenger compartment 106.

Further, the vehicle 101 includes a blower 31 for blowing air into the 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, and a coarse dust filter 5. It includes a fine 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 is for sucking the air of the first opening 41 opened to send air into the vehicle and the air of the outside R4 (for example, see FIG. 4) and the inside R3 (for example, see FIG. 4). It has a second opening 42 and a third opening 43 that are open. The second opening 42 communicates with the outside of the vehicle 101 and sucks the air of the outside R4 into the air passage 33. The third opening 43 communicates with the passenger compartment 106 and sucks the air in the passenger compartment 106 into the air passage 33. The first opening 41 communicates with the vehicle interior 106 and blows conditioned air into the vehicle interior.

In the air passage 33, the switching damper 30, fine particles, 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 detection unit 6, the ion generation unit 7, the coarse dust filter 5, the fan 34, the evaporator 35, and the heater core 36 are arranged in this order.

The switching damper 30 selectively opens the second opening 42 for sucking the air of the outside R4 and the third opening 43 for sucking the air of the inside R3, and alternately opens the air of the outside R4 and the inside R3 of the car. The air intake is switched.

The fine particle detection unit 6 is provided in the air passage 33 of the blower 31. Specifically, a fine particle detection unit 6 is provided between the ion generation unit 7 provided in the air passage 33 and the switching damper 30. The fine particle detection unit 6 detects the concentration of, for example, fine particulate matter PM2.5 (particulate matter 2.5) in the 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 control unit 38 controls the air volume of the fan 34 according to the detection result of the fine particle detection unit 6.

Further, an ion generating unit 7 for generating ions is provided in the middle of the air passage 33 in the main body 2. Specifically, the ion generation unit 7 is provided between the fine particle detection unit 6 in the air passage 33 and the coarse dust filter 5 so as to be close to the coarse dust filter 5. The ion generating unit 7 generates, for example, negative ions and positive ions during the cooling operation, the heating operation, and the blowing operation, and releases them to the air passage 33. In this way, the ion generating unit 7 generates both negative ions and positive ions and discharges them into the air passage 33, so that the fine particles can be negatively charged while the coarse dust filter 5 can be positively charged. .. In addition, it is possible to sterilize the inside of the passenger compartment 106, inactivate the virus, and remove the odor.

The ion generating unit 7 may mainly emit ions having the opposite polarity to the coarse dust filter 5 into the air passage 33. The ion generation unit 7 may mainly discharge only negative ions to 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 the outside R4 sent 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 generating portion 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, the air of the outside R4 or the air of the inside R3 is taken into the air passage 33 from the second opening 42 or the third opening 43, and heads toward the first opening 41 in the air passage 33. Airflow 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 the refrigerant flows. Further, the evaporator 35 is connected to a compressor (not shown) that operates a refrigeration cycle, and when power is transmitted from the engine to the compressor via a V-belt (not shown), the refrigerant flows through the refrigerant pipe. As a result, the air flowing between the fins is cooled by endothermic while the refrigerant is evaporated by the evaporator 35, and the cooling operation is performed.

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. By circulating the cooling water heated by the engine through the corrugated tube, the air flowing between the fins is heated and the heating operation is performed. Further, the air blowing operation is performed by blocking the power transmission from the engine to the compressor and blocking the flow of the cooling water to the corrugated tube of the heater core 36.

A display unit (not shown) including a plurality of operation switches (not shown) and a plurality of indicators (not shown) is provided on the instrument panel 108. By operating the operation switch, the user can switch between the cooling operation, the heating operation, and the ventilation operation. In addition, each indicator lights up to notify the cooling operation, the heating operation, or the ventilation operation.

Next, an example of the processing flow in the control unit of the blower in the present embodiment will be described. The processing flow of the control unit of the blower will be described with reference to FIG. 3 described above. For example, a blower operation is selected by starting the engine of the vehicle 101 and operating an operation switch, 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 of the outside R4 is taken into the air passage 33 through the second opening 42 with a predetermined air volume, and is ventilated in the air passage 33 to be ventilated in the first air passage 33. It is sent out from the opening 41 into the passenger compartment 106. Further, the ion generation unit 7 and the fine particle detection unit 6 are also driven together with the drive of the fan 4. The ion generation unit 7 generates ions in the air passage 33, and for example, mainly negative ions are released into the air passage 33. As a result, negative ions are mainly released into the air passage 33, and PM2.5 of the fine particles contained in the air of the vehicle outside R4 in the air passage 33 is negatively charged. Further, positive ions are sent to the leeward coarse dust filter 5 to positively charge the coarse dust filter 5.

As shown in FIG. 3A, the fine particle detection unit 6 in the air passage 33 detects, for example, PM2.5, which is fine particles having a predetermined particle size or less contained in the air of the outside R2, and causes the control unit 38 to detect the fine particles, for example, PM2.5. Send a detection signal. The control unit 38 determines whether or not the detection signal of the fine particle detection unit 6 has been acquired (S101).

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

The control unit 38 controls to reduce the wind speed generated by the fan 4 (S10). PM2.5 of fine particles carried with gentle air supply is sent 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 blower 31 of the present embodiment, the same effect as that of the first embodiment is obtained.

The rotation speed of the fan was changed to reduce the air velocity, but at least one of the first opening, the second opening, or the third opening of the air passage was used for adjusting the air volume. An opening / closing damper (not shown) may be provided. For example, by adjusting the opening / closing amount of the opening / closing damper, when the fine particles are higher than the predetermined value, the opening / closing damper may be opened and the wind speed may be lowered as compared with the case where the fine particles are lower than the predetermined value. By providing such an opening / closing damper, the wind speed can be controlled while keeping the rotation speed of the fan constant. Further, the wind speed may be controlled in cooperation with the rotation speed control of the fan and the opening / closing control of the opening / closing damper. As the structure of the opening / closing damper, a sliding structure, a shaft rotating structure, or the like can be appropriately applied.

Although the fine particle detection unit 6 is provided in the air passage 33, it may be provided in the instrument panel 108 of the vehicle interior 106.

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 cold air is sent out into the passenger compartment 106 from the first opening 41. When the heating operation or the ventilation operation is performed, the switching damper 31 closes the second opening 42 for sucking the outside air and opens the third opening 43 to circulate the inside air to the air in the passenger compartment 106. When the fine particle detection unit 6 detects the PM2.5 of the contained fine particles, the air volume of the fan 34 can be reduced and the coarse dust filter 5 can efficiently collect dust.

The fine particle detection unit 6 of each of the above-described embodiments detects fine particles having a predetermined particle size or less, but may detect the amount (concentration) of fine particles, and further, the fine particle detection unit 6 may detect particles. It may detect both the diameter and the amount of fine particles. Specifically, the fine particle detection unit detects the amount (concentration) of fine 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), whether or not the PM2.5 of the detected fine particles is equal to or higher than a ^{predetermined value (for example, 20 μg / m 3).} (S202). If the PM2.5 of the fine particles in the air is equal to or higher than a predetermined value (S202 YES), the process proceeds to S203. If the PM2.5 of the fine particles in the air is less than a predetermined value (S202 NO), the flow process is terminated. The control unit 8 controls to reduce the wind speed generated by the fan 4 (S203). PM2.5 of fine particles carried with gentle air supply is 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. ..

Further, it may be a ventilation system including the blower of each of the above-described embodiments. The ventilation system of the present disclosure includes at least a fan that sucks air into the 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. A blower including, for example, a fine particle detection unit for detecting and a control unit for controlling the fan so as to reduce the air velocity of air passing through a coarse dust filter when the fine particle detection unit detects fine particles having a predetermined particle size or less. , It can be installed in the space behind the ceiling of the building to 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 cannot be captured and are taken into the room. Moreover, when the ventilation system itself ventilates for 24 hours, it is necessary to use an expensive HEPA filter in order to constantly filter fine particles in the outside air, but as soon as the HEPA filter is used frequently, it is necessary to use it. It was very uneconomical because it became dirty, the performance of capturing fine particles deteriorated, and the frequency of replacement of the filter increased. According to such a ventilation system, the price of the system itself can be reduced because fine particles can be effectively captured by an inexpensive coarse dust filter without using an expensive HEPA filter, and the maintenance cost associated with filter replacement can be reduced. Can also be suppressed. The ventilation system can be applied to kitchen ducts, vehicle ducts, ventilation ducts of houses such as buildings, bathroom ducts, and the like.

[Experimental example]
FIG. 6 is an experimental device for obtaining the collection rate of dust collected by the coarse dust filter by changing the air volume of the fan. FIG. 7A is a table showing the difference between the particle size of the fine particles at a wind speed of 0.7 m / s and the collection rate and the collection rate when the ion generating part (PCI) is turned on or off. FIG. 7B is a table showing the difference between the particle size of the fine particles at a wind speed of 0.35 m / s and the collection rate and the collection rate when the ion generating part (PCI) is turned on or off.

As shown in FIG. 6, the experimental apparatus is provided with a coarse dust filter in the center and a fan for generating an air flow on the side. An ion generating portion (hereinafter referred to as PCI) is arranged on the windward side of the coarse dust filter. The fine particles emitted in the vicinity of the fan are referred to as dust A, and the 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%

The coarse dust filter uses two non-woven fabrics (thickness: t = 10 mm × 2 sheets) stacked on top of each other. As shown in FIG. 7A, the collection rate at a wind speed of 0.7 m / s, a particle size of fine particles of 0.3 μm, and PCI (OFF) is 23.21%. On the other hand, as shown in FIG. 8B, at a wind speed of 0.35 m / s, the collection rate is 36.64% when the particle size of the fine particles is 0.3 μm and PCI (OFF). By reducing the wind speed of the fan from 0.7 m / s to 0.35 m / s in this way, the effect of increasing the collection rate becomes clear, and the same effect can be confirmed with other particle sizes.

Next, as shown in FIG. 7A, the collection rate is 29.55% when the particle size of the fine particles is 0.3 μm and PCI (ON) is used 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% when the particle size of the fine particles is 0.3 μm and PCI (ON) is used. In this way, by turning on the 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 applies to other particle sizes. The effect can be confirmed.

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

The ion generating unit may have a plurality of positive electrodes and negative electrodes as discharge electrodes. Moreover, you may have a plurality of induction electrodes.

In the above embodiment, as an example, a case where the blower is mainly attached to an electric cooking device or a vehicle has been described. However, the blower in the above embodiment is, for example, a dehumidifier, a humidifier, an air purifier, an air conditioner, or a deodorizer. It may be attached to electronic devices such as machines, refrigerators, vacuum cleaners, and cooking appliances.

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

C Electric cooker D Electromagnetic cooker V Ventilation unit 1, 31 Blower 2, 32 Main body 3, 33 Air passage 4, 34 Fan 5 Coarse dust filter 6 Fine particle detection unit 7 Ion generation unit 8, 38 Control unit 11 First opening Part 12 Second opening 20 Housing 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 sucks air into the 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,
A particle detector that detects fine particles in the air,
When the fine particle detection unit detects fine particles having a predetermined particle size or less, a control unit that controls the fan so as to reduce the wind speed of air passing through the coarse dust filter.
Equipped with a blower. The fine particles are PM2.5.
The blower according to claim 1. Further, the air passage is provided with an ion generating unit for generating ions.
The ion generating portion is provided on the windward side of the coarse dust filter.
The blower according to claim 1 or 2. The coarse dust filter is a charged filter,
The blower according to claim 3. A ventilation system comprising the blower according to any one of claims 1 to 4.

Images