WO2018051783A1

WO2018051783A1 - Air purification device

Info

Publication number: WO2018051783A1
Application number: PCT/JP2017/030978
Authority: WO
Inventors: 末松　伸康; 貴幸石川
Original assignee: カルソニックカンセイ株式会社
Priority date: 2016-09-14
Filing date: 2017-08-29
Publication date: 2018-03-22

Abstract

This air purification device (100) purifies air and comprises: a discharge electrode (50) for generating ions in the air; a trapping unit (16) for trapping microparticles in the air that have been charged by the ions; and a blower (17) for causing air to flow so as to pass through the trapping unit (16). The blower (17) generates an air flow that hits microparticles accumulated on the discharge electrode (50).

Description

Air purification device

The present invention relates to an air purification device that purifies air.

JP2015-188851A discloses an air purifier (electric dust collector) that charges and collects dust in the air using a discharge electrode (ionizer).

In the above air purification apparatus, if dust accumulates on the discharge electrode over time, the output of the discharge electrode may be reduced and the air purification performance may be reduced.

As this coping method, JP2000-024548A proposes a cleaning device for cleaning the discharge electrode. In this cleaning device, a brush (cleaning member) is brought into sliding contact with the discharge electrode to scrape off dust accumulated on the discharge electrode.

However, the cleaning device of JP2000-024548A requires a brush that is in sliding contact with the discharge electrode in order to clean the discharge electrode. For this reason, when the cleaning device of JP2000-024548A is applied to the air purification device of JP2015-188851A, the structure of the air purification device may be complicated.

An object of the present invention is to provide an air purification device that maintains air purification performance with a simple structure.

According to an aspect of the present invention, there is provided an air purification device that purifies air, a discharge electrode that generates ions in the air, a collection unit that collects particles in the air charged by the ions, and the capture unit. And a blower for flowing air so as to pass through the collecting portion, and the blower is provided with an air purification device that generates a flow that applies an air flow to the fine particles accumulated on the discharge electrode.

According to the above aspect, the fine particles deposited on the discharge electrode are removed by applying an air flow to the discharge electrode. Thus, the deposited fine particles are removed from the discharge electrode without using a brush or the like. Therefore, it is possible to provide an air purification device that maintains air purification performance with a simple structure.

FIG. 1 is a schematic configuration diagram showing an air purification device according to an embodiment of the present invention. FIG. 2A is a diagram showing an ion generation amount deterioration map. FIG. 2B is a diagram showing an ion generation amount deterioration map. FIG. 3 is a diagram showing an ion generation amount recovery map. FIG. 4 is a flowchart showing control contents. FIG. 5 is a diagram showing how the amount of generated ions changes according to the elapsed time. FIG. 6 is a characteristic diagram showing how the amount of decrease in the amount of ion generation changes according to the air flow rate. FIG. 7 is a diagram showing an ion generation amount deterioration map. FIG. 8 is a flowchart showing the control contents. FIG. 9 is a diagram showing how the amount of ion generation changes according to the elapsed time. 10 is a cross-sectional view taken along line XX in FIG. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. FIG. 13 is a cross-sectional view showing a bracket and the like. 14 is a cross-sectional view taken along line XIV-XIV in FIG.

Hereinafter, an air purification device 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing a schematic configuration of an air conditioner 101 that is mounted on a vehicle 1 and to which an air purification device 100 is applied. The air purification device 100 supplies the purified air to the room 2 of the vehicle 1. The air purification device 100 is included in the air conditioner 101.

The air purification device 100 includes a casing (case) 10 that guides air and a blower (blower fan) 17. The blower 17 is driven by the electric motor 20 and sends air inside the housing 10. The amount of air blown by the blower 17 (discharged air flow rate per unit time) is switched in multiple stages by the control unit (controller) 5.

An outside air introduction port 11, an inside air introduction port 12, and an upstream side flow channel 14 are provided on the upstream side of the blower 17 in the flow channel (blower channel) 29 in the housing 10. The outside air inlet 11 is a flow path for introducing air from the outside of the vehicle 1 as indicated by an arrow A1. The inside air introduction port 12 is a flow path for introducing air from the room 2 as indicated by an arrow A2. The inside air inlet 12 has a shorter channel length and a lower channel resistance than the outside air inlet 11.

An intake door 13 that opens and closes the outside air inlet 11 and the inside air inlet 12 is provided at the junction. The angle (opening) of the intake door 13 can be changed by the control unit 5. The intake door 13 is switched between the outside air introduction position and the inside air introduction position shown in FIG. 1, or adjusts the mixing ratio of the inside air and the outside air according to the angle.

The upstream flow path 14 is provided with a discharge electrode 50 (ionizer), a fine particle concentration sensor (dust concentration sensor) 6, and a collection part (electrostatic filter) 16.

The fine particle concentration sensor 6 detects the concentration of fine particles in the air. The detection signal of the fine particle concentration sensor 6 is sent to the control unit 5.

The discharge electrode 50 is energized by the control unit 5 to generate positive ions or negative ions. The ions generated from the discharge electrode 50 charge the fine particles in the air flowing through the upstream flow path 14 as indicated by the arrow A3.

The collection unit 16 is energized so as to have positive or negative static electricity, and collects fine particles in the air (for example, PM (Particulate Matter) 2.5) charged by the discharge electrode 50 by electrostatic force. The collecting unit 16 may be fixed to the ground potential (the ground potential of the vehicle body) by being conducted to the vehicle body. Thus, the air flowing through the flow path 29 in the housing 10 is purified by passing through the collection unit 16 and then sucked into the blower 17.

In the flow path 29 in the housing 10, a downstream flow path 15, a defrost blowout port 25, a vent blowout port 26, and a foot blowout port 27 are provided on the downstream side of the blower 17. Air is blown out from the defrost outlet 25 toward the window 3 in the room 2. From the vent outlet 26, air is blown out toward the seat (not shown) in the room 2. Air is blown out from the foot outlet 27 toward the floor (not shown) of the room 2.

The downstream channel 15 is provided with an evaporator (heat exchanger for air cooling) 18, a heater core (heat exchanger for air heating) 19, and an air mix door 21. The air discharged from the blower 17 as indicated by the arrow A4 passes through the evaporator 18 and then the temperature is adjusted through the heater core 19 via the air mix door 21.

The air mix door 21 has its angle (opening) changed by the control unit 5 and adjusts the flow rate of air passing through the heater core 19.

Doors 22 to 24 are provided in the defrost outlet 25, the vent outlet 26, and the foot outlet 27, respectively. The doors 22 to 24 are changed in angle (opening) by the control unit 5, and the distribution of the air flow rate blown into the room 2 is changed.

The intake door 13, the air mix door 21, and the doors 22 to 24 constitute a flow path switching mechanism 30 that switches a flow path 29 (path) through which air flows. In the air purification apparatus 100, when the flow path length and curvature or the flow rate passing through the heater core 19 is changed by the operation of the flow path switching mechanism 30, the flow path resistance applied to the air flow increases or decreases. The channel resistance is smaller in the inside air circulation state in which the inside air introduction port 12 is opened than in the outside air introduction state in which the outside air introduction port 11 is opened. The flow resistance is an internal air circulation state in which the air in the room 2 circulates through the internal air introduction port 12, the upstream flow channel 14, the downstream flow channel 15, and the defrost outlet 25 as indicated by arrows A2 to A6. Becomes the smallest.

By the way, in the air purification apparatus 100, since the discharge electrode 50 is exposed to the air containing fine particles, the fine particles adhere to the discharge electrode 50. If the fine particles adhering to the discharge electrode 50 are deposited on the discharge electrode 50 without leaving the discharge electrode 50, the ion generation amount N (output) of the discharge electrode 50 is reduced, and the air purification performance is reduced.

As this coping method, the air purification device 100 is configured to remove fine particles by applying an air flow sucked into the blower 17 to the discharge electrode 50. By applying an air flow having a higher flow rate than the operating state in which fine particles are deposited to the discharge electrode 50, the deposited fine particles are separated from the discharge electrode 50 and removed.

The control unit 5 determines the cleaning timing for cleaning the discharge electrode 50 according to the operating state in the purification mode, and switches to the cleaning mode for increasing the flow rate of the air flow applied to the discharge electrode 50 at the cleaning timing.

The control unit 5 includes a CPU that controls the operation of each unit, a control program, for example, a ROM in which the maps shown in FIGS. 2A, 2B, and 3 are stored, detection signals from the particle concentration sensor 6 and the like, and various types of signals. And a RAM for temporarily storing information.

The control unit 5 determines the cleaning timing according to at least the air flow rate of the blower 17, the fine particle concentration detected by the fine particle concentration sensor 6, and the elapsed time t based on a preset map.

2A and 2B are ion generation amount deterioration maps showing deterioration characteristics in which the ion generation amount N of the discharge electrode 50 decreases according to the elapsed time t. The unit of the ion generation amount N is, for example, “pieces / cc”.

The ion generation amount deterioration map of FIG. 2A shows the ion generation amount in three operating states in which the air flow rate of the blower 17 is high (high value) higher than the intermediate value and the fine particle concentration is a constant value of low, medium, and high. N shows a characteristic that changes according to the elapsed time t. The ion generation amount deterioration map of FIG. 2B shows the ion generation amount in three operating states in which the air flow rate of the blower 17 is Low (a low value) lower than the intermediate value and the fine particle concentration is a constant value of low, medium, and high. N shows a characteristic that changes according to the elapsed time t. When operating in such a purification mode, the amount of generated ions N of the discharge electrode 50 gradually decreases due to the accumulation of fine particles on the discharge electrode 50. The degree to which the amount of generated ions N decreases increases as the amount of blown air decreases, and increases as the concentration of fine particles increases. It should be noted that the actual ion generation amount deterioration map stores not only three operating states but also characteristics in a large number of operating states.

Based on the ion generation amount deterioration map, the control unit 5 determines the deterioration time ratio Fn (= tn) between the operation time tn in each operating state of the air purification device 100 and the reference time T when the ion generation amount N decreases to a predetermined value. / T), and when the integrated value ΣFn of these obtained deterioration time ratios Fn becomes “1”, it is determined as the cleaning timing for switching to the cleaning mode.

For example, the control unit 5 determines the point in time when the ion generation amount is reduced by 5% as the cleaning timing. When the air purification apparatus 100 operates for 30 minutes in a certain operating state, and the ion generation amount decreases by 5%, the reference time T is 30 minutes. When this operating state is operated for 15 minutes, the operating time tn is 15 minutes, and the deterioration time ratio Fn is obtained by the following equation.
Fn = tn / T = 15/30 = 0.5
After Fn becomes 0.5 in this way, Fn is accumulated as the machine further operates in a certain operating state, and when ΣFn = 1 is eventually reached, the cleaning timing is determined.

Further, when executing the cleaning mode, the control unit 5 calculates an execution time for executing the cleaning mode according to the fine particle concentration based on a preset ion generation amount recovery map.

The ion generation amount recovery map of FIG. 3 shows a characteristic that the ion generation amount N increases and recovers according to the elapsed time t during which the cleaning mode is performed in three operating states in which the fine particle concentration is a constant value of low, medium, and high. Show. It should be noted that the actual ion generation amount deterioration map stores not only three operating states but also characteristics in a large number of operating states.

Next, the control content of the control unit 5 will be described with reference to the flowchart shown in FIG.

First, in step S1, the following information and signals are read.
The already calculated integrated value ΣFn. Note that ΣFn = 0 when the operation of the air purification apparatus 100 is started.
-Fine particle concentration signal. This is a particle concentration signal detected by the particle concentration sensor 6.
An operation signal of the blower 17 This is an operation signal of the electric motor 20 (for example, the voltage or frequency of the electric power supplied to the electric motor 20) corresponding to the amount of air blown by the blower 17.
・ Flow path switching signal. This is an operation signal corresponding to the angles of intake door 13, air mix door 21, and doors 23-24.

Then, it progresses to step S2 and it is determined whether the operation signal of the electric motor 20 is ON. Here, when the air purification device 100 whose operation signal is off is stopped, the process returns to the start. On the other hand, when the air purification device 100 whose operation signal is on is operating, the process proceeds to step S3.

In step S3, the deterioration time ratio Fn is calculated as Fn = tn / T from the reference time T and the operation time tn obtained based on the ion generation amount deterioration map shown in FIGS. 2A and 2B and the like.

In step S4, an integrated value ΣFn is calculated based on the calculated deterioration time ratio Fn.

Subsequently, the process proceeds to step S5, in which it is determined whether or not the integrated value ΣFn has become “1” or more. If the integrated value ΣFn is smaller than “1”, the process returns to the start. On the other hand, when the integrated value ΣFn becomes “1” or more, it is determined that the cleaning timing has come, and the process proceeds to step S6.

In step S6, based on the ion generation amount recovery map shown in FIG. 3, the execution time for executing the cleaning mode according to the fine particle concentration is calculated.

In subsequent step S7, the mode is switched to the cleaning mode, and the cleaning mode is executed over the calculated cleaning mode. Then, the integrated value ΣFn is reset to “0” and the process returns to the start.

In the cleaning mode, the following control is performed.
The air volume of the blower 17 is switched to a set air volume that is higher than the maximum air volume that is set in the purification mode.
The flow path switching mechanism 30 switches the angles of the

doors

13, 21 to 24 so that the flow path resistance applied to the air flow is reduced. For example, the intake door 13 is switched to the inside air introduction position that closes the outside air introduction port 11 and opens the inside air introduction port 12. The air mix door 21 is switched to the maximum cooling position that closes the heater flow path 28 in which the heater core 19 is interposed. The door 23 is switched to a position where the defrost outlet 25 is opened.

Thus, in the cleaning mode, the flow rate of air blown to the discharge electrode 50 can be increased by increasing the air flow rate of the blower 17 and decreasing the flow path resistance. Thereby, the fine particles deposited on the discharge electrode 50 are separated from the discharge electrode 50 and removed by the air flow hitting the fine particles.

FIG. 5 is a diagram showing how the ion generation amount N changes according to the elapsed time t when the air purification apparatus 100 is in operation.

The characteristics indicated by the two-dot chain line in FIG. 5 are those in the case where the discharge electrode 50 is not cleaned, and the amount of ions generated by depositing fine particles on the discharge electrode 50 as the elapsed time t becomes longer. N gradually decreases.

On the other hand, in the air purification device 100, as indicated by a solid line in FIG. 5, when the cleaning timing at which the integrated value ΣFn becomes “1” or more eventually comes as the elapsed time t elapses, the cleaning mode is changed. Executed. In the cleaning mode, the ion generation amount N is recovered by increasing the air flow rate and cleaning the discharge electrode 50. Thus, the cleaning mode is executed between the purification modes, so that the ion generation amount N is kept within a predetermined value or more. Note that the interval at which the cleaning mode is executed again after the cleaning mode is executed changes according to the fine particle concentration and the air flow rate.

As described above, when the control unit 5 executes the flowchart shown in FIG. 4, the cleaning timing is determined according to the integrated value ΣFn of the operating time tn in which the fine particles in the air accumulate on the discharge electrode 50 in the purification mode. In the cleaning mode, the air flow is applied to the discharge electrode 50 in the cleaning mode in which the flow rate of the air flow is higher than that in the purification mode. Thereby, the fine particles accumulated on the discharge electrode 50 are removed, whereby the ion generation amount N is recovered.

Incidentally, there is an operating state in which the ion generation amount N recovers even in the purification mode. In an operating state where the concentration of fine particles in the air is low to some extent and the air flow velocity is high to some extent, the fine particles accumulated on the discharge electrodes 50 are separated and removed by the air flow that hits the discharge electrodes 50, thereby recovering the ion generation amount N. .

Corresponding to the fact that there is an operating state in which the ion generation amount N recovers even in the purification mode, the control unit 5 may execute the flowchart shown in FIG. 8 instead of the flowchart shown in FIG. By executing the flowchart shown in FIG. 8, as will be described later, control is performed to delay the cleaning timing in accordance with the operation time (recovery time tcn) in which the ion generation amount N recovers in the purification mode. Hereinafter, the contents of this control will be described with reference to FIGS.

FIG. 6 is a characteristic diagram showing how the amount of decrease in the amount of ion generation N (the rate at which the amount of ion generation N of the discharge electrode 50 decreases per unit time) changes as the air flow rate increases. The reduction amount of the ion generation amount N decreases as the air flow rate increases in the operation state where the fine particle concentration is A, B, C (low, medium, high). The operating state in which the fine particle concentration is lower than the operating state of B and the air flow rate is increased becomes the recovery regions D1 and D2 in which the reduction amount of the ion generation amount N is smaller than zero. In the recovery regions D 1 and D 2, the amount of generated ions N is recovered by removing the fine particles from the discharge electrode 50 along with the air flow hitting the discharge electrode 50. The control unit 5 executes the purification mode in the recovery region D1, and performs control to delay the cleaning timing in accordance with the recovery of the ion generation amount N. The control unit 5 executes the cleaning mode in the recovery region D2 and performs control to recover the ion generation amount N.

FIG. 7 is an ion generation amount deterioration map showing deterioration characteristics in which the ion generation amount N of the discharge electrode 50 decreases according to the elapsed time t. In an operating state in which the blower 17 has a low flow rate or a high flow rate and the particle concentration is a constant value of low, medium, or high, the ion generation amount N gradually decreases according to the elapsed time t. In the case where the recovery area D1 in which the air flow rate is High and the fine particle concentration is lower than the operating state continues, the fine particles are removed from the discharge electrode 50, so that the ion generation amount N decreases according to the elapsed time t. Without being kept at the maximum value.

Based on the ion generation amount deterioration map shown in FIG. 7, the control unit 5 performs the recovery time tcn that operates in the recovery region D1 in which the fine particles are removed from the discharge electrode 50 and the reference recovery time that the ion generation amount N recovers to a predetermined value. The recovery time ratio Fcn (= tcn / Tc) with Tc is obtained.

When the air purification apparatus 100 operates in the recovery region D1 for 30 minutes and the amount of ion generation recovers by 5% (predetermined value), the reference recovery time Tc is set to 30 minutes. When operating for 15 minutes in the recovery region D1, the recovery time tcn is 15 minutes, and the recovery time ratio Fcn is obtained by the following equation.
Fcn = tcn / Tc = 15/30 = 0.5

The control unit 5 determines that the point in time when the ion generation amount has decreased by 5% (predetermined value) as the cleaning timing for switching to the cleaning mode. Based on the ion generation amount deterioration map shown in FIG. 7, the control unit 5 deteriorates between the operation time tn when fine particles are deposited on the discharge electrode 50 and the reference time T when the ion generation amount N decreases by 5% (predetermined value). The time ratio Fn (= tn / T) is obtained. Then, when the integrated value Σ (Fn−Fcn) obtained by subtracting the recovery time ratio Fcn of the recovery time tcn of the recovery region D1 from the obtained deterioration time ratio Fn becomes “1”, it is determined as the cleaning timing. .

Next, the contents of the control will be described with reference to the flowchart shown in FIG.

First, in step S11, the following information and signals are read.
The already calculated integrated value ΣFn−Fcn. Note that ΣFn−Fcn = 0 at the start of operation of the air purification device 100.
-Fine particle concentration signal.
An operation signal of the blower 17
・ Flow path switching signal.

Then, it progresses to step S12 and it is determined whether the operation signal of the electric motor 20 is ON. Here, when the air purification device 100 whose operation signal is off is stopped, the process returns to the start. On the other hand, when the air purification device 100 whose operation signal is on is operating, the process proceeds to step S13.

In step S13, an operation time tn and a recovery time tcn obtained based on the ion generation amount deterioration map shown in FIG. The deterioration time ratio Fn is calculated as Fn = tn / T according to the operation time tn. The recovery time ratio Fcn is calculated as Fcn = tcn / Tc according to the recovery time tcn. Then, a value (Fn−Fcn) obtained by subtracting the recovery time ratio Fcn from the deterioration time ratio Fn is obtained.

In step S14, an integrated value Σ (Fn−Fcn) obtained by integrating the obtained value (Fn−Fcn) per unit time is calculated.

Subsequently, the process proceeds to step S15, and it is determined whether or not the integrated value Σ (Fn−Fcn) is larger than “0”. Here, when the integrated value Σ (Fn−Fcn) becomes “0”, it is considered that the ion generation amount N has recovered to the maximum value, and the process proceeds to step S19, where the integrated value Σ (Fn−Fcn) is reached. ) Is reset to “0” and the process returns to the start.

On the other hand, if the integrated value ΣFn is greater than “0”, the process proceeds to step S16 to determine whether or not the integrated value Σ (Fn−Fcn) is “1” or more. If the integrated value ΣFn is smaller than “1”, the process returns to the start. On the other hand, if the integrated value ΣFn is equal to or greater than “1”, it is determined that the cleaning timing has come, and the process proceeds to step S17.

In step S17, an execution time for executing the cleaning mode according to the fine particle concentration is calculated based on the ion generation amount recovery map shown in FIG.

In the subsequent step S18, the mode is switched to the cleaning mode, and the cleaning mode is executed over the calculated execution time. Then, the integrated value Σ (Fn−Fcn) is reset to “0” and the process returns to the start.

FIG. 9 is a diagram showing how the ion generation amount N changes according to the elapsed time t when the air purification apparatus 100 is in operation.

The section surrounded by a broken line in FIG. 9 is in the recovery region D1, and the recovery time ratio Fcn for removing the fine particles is subtracted from the deterioration time ratio Fn in which fine particles are deposited in this section. As a result, as the recovery time tcn in the recovery region D1 increases, the time t until the transition to the cleaning mode is extended. Thus, by reducing the frequency of execution of the cleaning mode, the operation time for executing the purification mode is lengthened, and the air is purified.

Next, a specific example of the air purification device 100 shown in FIGS. 10 to 14 will be described.

As shown in FIGS. 10 and 11, the discharge electrode 50 is provided to face the air flow sucked into the blower 17. The discharge electrode 50 is provided in the central portion of the upstream flow path 14 upstream of the collecting portion 16 and is disposed so as to be substantially orthogonal to the rotation center axis O17 of the blower 17.

When the air purification apparatus 100 is in operation, the air flow strikes the discharge electrode 50 substantially perpendicularly, so that accumulation of fine particles on the discharge electrode 50 is suppressed. In the purification mode, even if fine particles are deposited on the discharge electrode 50 with a low air flow rate, the fine particles once deposited with the air flow rate being increased are separated from the discharge electrode 50 and removed. As a result, the frequency of executing the cleaning mode can be reduced, or the cleaning mode need not be executed.

The blower 17 includes a fan 41 having a large number of blades arranged in a cylindrical shape, and a casing 42 that houses the fan 41. The fan 41 rotates around the rotation center axis O17 and blows air in the centrifugal direction. The casing 42 includes a bell mouth suction port 42A that guides air to the inside of the fan 41, a shellfish-like rectifying unit 42B that collects air sent from the fan 41, and a discharge port 42C that discharges the collected air (FIG. 12). Reference). The casing 42 may be formed integrally with the housing 10.

The collection unit 16 is provided on the upstream side of the suction port 42 A and is disposed so as to face the casing 42. The filter center line O16 of the collection unit 16 extends substantially parallel to the rotation center axis O17 of the blower 17 and is offset with respect to the rotation center axis O17.

The intake door 13 rotates around the hinge shaft 43. The hinge shaft 43 extends on a surface substantially orthogonal to the rotation center axis O17 with respect to the rotation center axis O17 of the blower 17.

The tip 13A of the plate-like intake door 13 rotates with an arcuate locus Q centering on the hinge shaft 43. The discharge electrode 50 is disposed in a region between the trajectory Q and the collection unit 16. Thereby, it is avoided that the discharge electrode 50 interferes with the action | operation of the intake door 13, and it is provided in the upstream of the collection part 16. FIG.

In the upstream flow path 14, a region formed between the opening end of the inside air introduction port 12 and the opening end of the suction port 42A is defined as an inside air introduction region 14A. The inside air introduction region 14A is a space formed inside a plurality of straight lines L connecting the opening edge of the inside air introduction port 12 and the opening edge of the suction port 42A.

In an operating state where the intake door 13 closes the outside air introduction port 11 and opens the inside air introduction port 12 (inside air circulation state), the air from the room 2 is upstream from the inside air introduction port 12 as indicated by an arrow A1. It flows into the flow path 14. At this time, in the upstream flow path 14, the main flow of the air flow from the inside air introduction port 12 toward the suction port 42 A flows through the inside air introduction region 14 A, and thus the air flow rate in the inside air introduction region 14 A becomes higher than the other regions.

The discharge electrode 50 is disposed in the inside air introduction region 14A. Thereby, the air flow velocity which hits the discharge electrode 50 is increased, and the effect of removing fine particles deposited on the discharge electrode 50 is obtained.

12, the first hinge parallel line R17 is a straight line including the rotation center axis O17 of the blower 17 and extending substantially parallel to the hinge axis 43 of the intake door 13. The second hinge parallel line R 16 is a straight line that includes the filter center line O 16 of the collection portion 16 and extends substantially parallel to the hinge shaft 43 of the intake door 13. The central transverse region 14B is a region sandwiched between the first hinge parallel line R17 and the second hinge parallel line R16. The center crossing region 14B is a region away from both the

inner wall surfaces

10A and 10C facing each other in the casing 10 in a direction orthogonal to the hinge shaft 43 (left and right direction in FIG. 12). For this reason, the air flow flowing through the central transverse region 14B has a higher flow velocity than the region in the vicinity of the

inner wall surfaces

10A and 10C, and a velocity component (along the rotation center axis O17 of the blower 17) where the air flow faces the discharge electrode 50. Speed component toward the blower 17) increases.

The discharge electrode 50 is disposed in the central transverse region 14B. As a result, the flow velocity of air hitting the discharge electrode 50 is increased, and the velocity direction of the air flow is opposed to the discharge electrode 50 substantially orthogonally, so that the effect of removing fine particles deposited on the discharge electrode 50 can be enhanced.

12, the first hinge orthogonal line P17 is a straight line including the rotation center axis O17 of the blower 17 and extending in a direction substantially orthogonal to the hinge axis 43 of the intake door 13. The second hinge orthogonal line P 16 is a straight line including the filter center line O 16 of the collection part 16 and extending in a direction substantially orthogonal to the hinge shaft 43 of the intake door 13. The central longitudinal section 14C is an area sandwiched between the first hinge orthogonal line P17 and the second hinge orthogonal line P16. The central longitudinal region 14C is a region away from both the inner wall surfaces 10B and 10D facing each other of the housing 10 in a direction parallel to the hinge shaft 43 (vertical direction in FIG. 12). For this reason, the airflow flowing through the central longitudinal section 14C has a higher flow velocity than the areas near the inner wall surfaces 10B and 10D, and the velocity component at which the airflow faces the discharge electrode 50 increases.

The discharge electrode 50 is disposed in the central longitudinal region 14C. As a result, the flow velocity of the air impinging on the discharge electrode 50 is increased, and the velocity component of the air flow faces the discharge electrode 50 substantially orthogonally, so that the effect of removing the fine particles deposited on the discharge electrode 50 can be enhanced.

The central region 14D is a region where the central transverse region 14B and the central longitudinal region 14C intersect. The central region 14D is separated from the four inner wall surfaces 10A to 10D of the housing 10 and faces the central portion of the blower 17. For this reason, the velocity component at which the airflow faces the discharge electrode 50 is highest in the central region 14D.

The discharge electrode 50 is disposed in the central region 14D. As a result, the air flow velocity hitting the discharge electrode 50 is increased and the velocity component of the air flow facing the discharge electrode 50 is increased, so that the effect of removing fine particles deposited on the discharge electrode 50 can be enhanced most. Furthermore, since the charged fine particles are diffused over a wide range of the collection unit 16, the purification performance by the collection unit 16 can be enhanced.

Next, the mounting structure of the discharge electrode 50 will be described with reference to FIGS.

As shown in FIG. 13, the discharge electrode 50 is supported by the housing 10 via a rod-shaped bracket 51. The bracket 51 is disposed so as to extend substantially parallel to the hinge shaft 43. The discharge electrode 50 is provided at the tip of the bracket 51 and is disposed at the center of the upstream flow path 14.

As shown in FIG. 14, two harnesses 55 are accommodated in the bracket 51. The discharge electrode 50 is energized through two harnesses 55.

As shown in FIG. 13, the base end portion of the bracket 51 is attached to the attachment portion 60 of the housing 10 via the

annular grommets

52 and 53 and the two screws 54.

The mounting portion 60 has a through-hole 61 through which the bracket 51 passes and a pair of boss portions 62 into which two screws 54 are screwed.

As shown in FIG. 10, the housing 10 is provided with a plurality of (here, three) attachment portions 60 to which the brackets 51 are attached. The mounting portions 60 are arranged so as to be aligned in a direction substantially orthogonal to the hinge shaft 43 (left and right direction in FIG. 10).

The housing 10 is formed by dividing the upper and

lower members

8 and 9 sandwiching the attachment portion 60. For example, the member 9 on the upper side of the housing 10 is selected and provided in a shape corresponding to a vehicle in which the position of the handle is different on the left and right. Thus, when the shape of the housing 10 is different depending on the vehicle (vehicle type), the attachment portion 60 to which the bracket 51 is attached is changed. Thus, the mounting position of the discharge electrode 50 is changed in the vehicle width direction. Thereby, it becomes possible to provide the discharge electrode 50 in an appropriate position with respect to the casing 10 of a different vehicle.

Also, the mounting position of the discharge electrode 50 can be changed in the longitudinal direction of the vehicle by changing the length of the bracket 51 or changing the shapes of the

grommets

52 and 53 according to the shape of the housing 10.

Next, the effect of this embodiment will be described.

According to the present embodiment, the air purification apparatus 100 purifies air, and includes a discharge electrode 50 that generates ions in the air, a collection unit 16 that collects particles in the air charged by the ions, and a collection unit. And a blower 17 for flowing air so as to pass through the collecting portion 16, and the blower 17 is configured to generate a flow in which the air flow is applied to the fine particles deposited on the discharge electrode 50.

With this configuration, the fine particles deposited on the discharge electrode 50 are removed by applying an air flow to the fine particles deposited on the discharge electrode 50. Thus, in the discharge electrode 50, the deposited fine particles are removed without using a brush or the like. Therefore, the air purification apparatus 100 can maintain the air purification performance with a simple structure.

The air purification device 100 is configured to switch between a purification mode in which ions are generated from the discharge electrode 50 to purify the air, and a cleaning mode in which the flow rate of the airflow hitting the discharge electrode 50 is increased.

With this configuration, when fine particles are deposited on the discharge electrode 50 in the purification mode with a low airflow velocity, the airflow is applied to the discharge electrode 50 in the cleaning mode in which the airflow velocity is higher than that in the purification mode. As a result, the fine particles deposited on the discharge electrode 50 are removed.

It should be noted that the switching between the purification mode and the cleaning mode is not limited to the configuration performed by the control unit 5 and may be configured manually.

Further, the air purification device 100 includes the control unit 5, and the control unit 5 is configured to determine the cleaning timing for switching to the cleaning mode according to the operating state in the purification mode.

With this configuration, the cleaning timing is determined by measuring, for example, the ion generation amount N (particulate deposition amount) of the discharge electrode 50 according to the operating state in the purification mode. In this way, by executing the cleaning mode at an appropriate time, it is possible to lengthen the operation time during which the purification mode is executed.

Moreover, the control part 5 is based on the preset map, and the ion generation amount N (particulate deposition amount) of the discharge electrode 50 according to the parameter of the elapsed time t, the ventilation volume of the air blower 17, and particulate concentration at least. Etc., the cleaning timing can be accurately determined. In addition, it is good also as a structure which calculates ion generation amount N according to the same parameter based on a regression equation, without using a map instead of the structure mentioned above.

Further, the control unit 5 performs the cleaning in which the cleaning mode is executed as the recovery time tcn (operation time) in which the ion generation amount N of the discharge electrode 50 increases (recovers) in the operation state in which the purification mode is executed increases. It was set as the structure which delays timing.

Then, the controller 5 determines the deterioration time ratio Fn (= tn / T) between the operation time tn when the ion generation amount N of the discharge electrode 50 is reduced and the reference time T when the ion generation amount N is reduced to a predetermined value, and the ion The recovery time ratio Fcn (= tcn / Tc) between the recovery time tcn when the generation amount N increases (recovers) and the reference recovery time Tc when the ion generation amount N recovers to a predetermined value, and the recovery time ratio Fn from the deterioration time ratio Fn An integrated value Σ (Fn−Fcn) of a value obtained by subtracting is obtained, and the cleaning timing is determined when the integrated value Σ (Fn−Fcn) reaches a predetermined value “1”.

With this configuration, the cleaning timing is delayed in accordance with the particles once deposited on the discharge electrode 50 in the purification mode being removed from the discharge electrode 50 by the air flow hitting the discharge electrode 50. In this way, by reducing the frequency with which the cleaning mode is executed, the operating time for which the purification mode is executed can be lengthened to purify the air.

In the cleaning mode, the air flow rate of the blower 17 is switched to a set air volume that is higher than the maximum air volume set in the purification mode. Thereby, the fine particles deposited on the discharge electrode 50 are quickly removed.

In the cleaning mode, the flow path 29 is switched by the flow path switching mechanism 30 so as to reduce the flow path resistance of the air flow sent by the blower 17.

Further, in the cleaning mode, the outside air inlet 11 is closed by the intake door 13 of the passage switching mechanism 30 and the passage 29 is switched so as to open the inside air inlet 12.

With this configuration, in the cleaning mode, the flow resistance of the air flow sent by the blower 17 can be reduced, and the air flow rate hitting the discharge electrode 50 can be increased. Thereby, the fine particles deposited on the discharge electrode 50 are quickly removed.

In addition, not only the said structure but it is good also as a structure from which the microparticles | fine-particles deposited on the discharge electrode 50 are removed in the state with much blast volume in purification | cleaning mode.

Further, the flow path 29 has an inside air introduction region 14A formed between the opening end of the inside air introduction port 12 and the opening end of the suction port 42A. The discharge electrode 50 is configured to be disposed in the inside air introduction region 14A.

By configuring in this way, in the upstream flow path 14, the main flow of the air flow from the inside air introduction port 12 toward the suction port 42 A flows through the inside air introduction area 14 A. The effect of removing the fine particles deposited on 50 is obtained.

Further, the flow path 29 includes a first hinge parallel line R17 that includes the rotation center axis O17 of the blower 17 and extends substantially parallel to the hinge shaft 43 of the intake door 13, and a filter center line O16 of the collection portion 16. A central transverse region 14B is sandwiched between a hinge axis 43 of the door 13 and a second hinge parallel line R16 extending substantially in parallel. The discharge electrode 50 was arranged in the central transverse region 14B.

With this configuration, in the upstream flow path 14, the air flow rate hitting the discharge electrode 50 is increased, and the velocity direction of the air flow is opposed to the discharge electrode 50 so as to be substantially perpendicular to the discharge electrode 50. The effect of removing fine particles can be enhanced.

Further, the flow path 29 includes a first hinge orthogonal line P17 including the rotation center axis O17 of the blower 17 and extending in a direction substantially orthogonal to the hinge shaft 43 of the intake door 13, and a filter center line O16 of the collection unit 16. A central longitudinal region 14 C sandwiched between a hinge axis 43 of the intake door 13 and a second hinge orthogonal line P 16 extending in a direction substantially orthogonal to the intake door 13 is included. The discharge electrode 50 was configured to be disposed in the central longitudinal region 14C.

The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

The present invention is suitable as an air purification device mounted on a vehicle, but can also be applied to an air purification device used other than a vehicle.

This application is based on Japanese Patent Application No. 2016-179649 filed with the Japan Patent Office on September 14, 2016, and Japanese Patent Application No. 2017-088417 filed with the Japan Patent Office on April 27, 2017. And the entire contents of these applications are hereby incorporated by reference.

Claims

An air purification device for purifying air,
A discharge electrode for generating ions in the air;
A collection unit for collecting fine particles in the air charged by ions;
A blower for flowing air so as to pass through the collection part,
The blower generates a flow in which an air flow is applied to fine particles deposited on the discharge electrode.
Air purification device.
The air purification device according to claim 1,
A purification mode to purify the air;
The mode is switched to a cleaning mode for increasing the flow velocity of the air flow hitting the discharge electrode.
Air purification device.
The air purification device according to claim 2,
A control unit;
The control unit determines a cleaning timing for switching to the cleaning mode according to an operating state of the purification mode.
Air purification device.
The air purification device according to claim 3,
The control unit determines the cleaning timing according to at least an elapsed time during which the blower operates, an air flow rate of the blower, and a fine particle concentration of air flowing into the collection unit,
Air purification device.
The air purification device according to claim 4,
The control unit delays the cleaning timing in accordance with an increase in operating time in which the amount of ions generated in the discharge electrode in the purification mode increases.
Air purification device.
The air purification device according to claim 5,
The controller is
Deterioration time ratio between the operation time when the ion generation amount of the discharge electrode decreases and the reference time when the ion generation amount decreases to a predetermined value;
A recovery time ratio between a recovery time when the ion generation amount of the discharge electrode increases and a reference recovery time when the ion generation amount recovers to a predetermined value,
Find the integrated value of the value obtained by subtracting the recovery time ratio from the deterioration time ratio,
When the integrated value reaches a predetermined value, the cleaning timing is determined.
Air purification device.
The air purification device according to any one of claims 2 to 6,
In the cleaning mode, the air volume of the blower is switched to a set air volume that is higher than the maximum air volume set in the purification mode.
Air purification device.
The air purification device according to any one of claims 2 to 7,
A flow path switching mechanism for switching the flow path of air;
In the cleaning mode, the flow path switching mechanism switches the flow path so as to reduce the flow resistance of the air flow.
Air purification device.
It is an air purification apparatus of Claim 8, Comprising:
The flow path switching mechanism is
An inside air inlet for introducing air from the interior of the vehicle;
An outside air inlet for introducing air from the outside of the vehicle;
An intake door that opens and closes the outside air inlet and the inside air inlet,
In the cleaning mode, the outside air introduction port is closed and the inside air introduction port is opened.
Air purification device.
The air purification device according to claim 9,
The flow path has an inside air introduction region formed between an opening end of the inside air introduction port and an opening end of the suction port of the blower,
The discharge electrode is disposed in the inside air introduction region,
Air purification device.
It is an air purification apparatus of Claim 10, Comprising:
The blower includes a fan that rotates about a rotation center axis,
The intake door rotates around a hinge shaft disposed on a surface substantially orthogonal to the rotation center axis,
The flow path includes a first hinge parallel line including the rotation center axis and extending substantially parallel to the hinge axis, and a second hinge parallel line including a filter center line of the collecting portion and extending substantially parallel to the hinge axis. Having a central transverse region sandwiched between
The discharge electrode is disposed in the central transverse region;
Air purification device.
It is an air purification apparatus of Claim 10, Comprising:
The blower includes a fan that rotates about a rotation center axis,
The intake door rotates around a hinge shaft disposed on a surface substantially orthogonal to the rotation center axis,
The flow path includes a first hinge orthogonal line including the rotation center axis and extending in a direction substantially orthogonal to the hinge axis, and a second hinge extension including a filter center line of the collection portion and extending in a direction substantially orthogonal to the hinge axis. A central longitudinal region sandwiched between the hinge orthogonal line and
The discharge electrode is disposed in the central longitudinal region;
Air purification device.