WO2019003378A1

WO2019003378A1 - Dust collection device and air conditioner

Info

Publication number: WO2019003378A1
Application number: PCT/JP2017/023919
Authority: WO
Inventors: 保博中村; 太田　幸治; 典亮勝又; 彰則清水
Original assignee: 三菱電機株式会社
Priority date: 2017-06-29
Filing date: 2017-06-29
Publication date: 2019-01-03
Also published as: SG11201910257TA; CN110769938B; JP6425836B1; JPWO2019003378A1; CN110769938A

Abstract

A dust collection device (1) is provided with: a housing (4) provided with an air duct (3) for passage of air; an unwinding unit (7) for supplying, to the air duct, a film (5) transported along a path that traverses the air duct; a friction body (6) for applying friction to and charging the film fed from the unwinding unit; and a winding unit (8) for winding up the charged film disposed in the air duct. With this dust collection device, it is possible to provide a dust collection device wherein collection efficiency can easily be recovered and that does not require maintenance over a long period of time.

Description

Dust collection device and air conditioner

The present invention relates to a dust collection device that generates static electricity by friction to collect dust, and an air conditioner equipped with the same.

There is an electric precipitator as one of the dust collection devices for collecting dust in the air. An electrostatic precipitator corona discharges by applying a high voltage to a wire electrode with a high voltage power supply, and the generated ions charge the dust in the air by the generated ions, and the high voltage power supply is high between the flat electrode An electrostatic field is formed by applying a voltage, and it has a dust collection part that electrostatically collects dust on a flat plate electrostatically, and it is excellent despite the low pressure loss by the electrostatic collection mechanism. Dust collection rate. Generally, in the electrostatic precipitator, when the collected dust deposits on the electrode, discharge (reverse ionization) occurs in the dust layer, and the dust collection performance decreases, so maintenance of the electrode cleaning is generally required every several months. In addition, since the electrostatic precipitator applies a high voltage to the electrodes with a high voltage power supply, it is difficult to handle, and this also requires periodic maintenance.

On the other hand, dust collection devices are often used together with ventilation devices and air conditioners such as air conditioners, but in recent years such air conditioners are often installed at indoor high places and in the ceiling, and installation locations Some people do not have easy access for maintenance. For this reason, a dust collection device with low maintenance frequency, specifically, a dust collection device that does not require maintenance for a long period of several years to several decades is desired.

In

Patent Documents

1 and 2, as a dust collection device for collecting dust in the air without application of a high voltage, electrostatically collected by Coulomb force using a dust-collected body charged by friction. A dust collection device that performs dusting is described.

JP 2002-336733 A Japanese Patent Application Laid-Open No. 2002-186879

The friction-charged dust collection devices of

Patent Documents

1 and 2 have an advantage that they are easy to handle because they do not use a high voltage. However, every time the collection rate decreases due to the accumulation of dust on the dust collection body, maintenance for removing the dust adhering to the dust collection body and recovering the collection rate is required, and maintenance is unnecessary for a long time also It is difficult to do.

The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a dust collection device with a long maintenance interval.

The dust collection device according to the present invention is
A housing with an air path through which the air passes;
An unwinding section for feeding a film conveyed along a path traversing the inside of the air path toward the inside of the air path;
A friction body that frictionally charges the film delivered from the unwinding portion;
A winding unit that charges and winds the film disposed in the air passage;
It is characterized by having.

According to the dust collection device of the present invention, a case provided with an air passage through which air passes, a film charged by friction and conveyed along a route crossing the air passage, and the film as the air An unwinding unit for feeding into the passage, a friction body for charging the film fed from the unwinding unit by friction, and a winding unit for winding the film conveyed into the air passage. Can provide a dust collection device with a long maintenance period.

1 is a schematic cross-sectional view of a dust collection device according to Embodiment 1 of the present invention. It is a schematic sectional drawing of the dust collection device by Embodiment 2 of this invention. It is a schematic sectional drawing of the dust collection device by Embodiment 3 of this invention. It is a schematic sectional drawing of the air conditioner by Embodiment 4 of this invention. It is a figure which shows the operation | movement flowchart of the air conditioner by Embodiment 4 of this invention. It is a figure which shows the modification of the air conditioner by Embodiment 4 of this invention. It is a schematic sectional drawing of the air conditioner by Embodiment 5 of this invention. It is a schematic sectional drawing of the dust collection device by Embodiment 6 of this invention.

Hereinafter, preferred embodiments of the dust collection device according to the present invention will be described with reference to the drawings. The same or corresponding parts in the respective drawings will be described with the same reference numerals.

Embodiment 1
FIG. 1 is a schematic view showing the dust collection device 1 of the first embodiment. The dust collection device 1 is transported along a series of paths crossing the air passage 3 and the case 4 internally provided with the air passage 3 through which the air containing the dust 2 passes, and is charged by friction to make the air passage 3 A film 5 for electrostatically collecting dust 2 in the passing air, a friction body 6 for charging the film 5 by friction, an unwinding unit 7 for delivering the film 5, and a winding unit 8 for winding the film 5 And a control unit 9 that controls the unwinding unit 7 and the winding unit 8.

The film 5 is a film of 80 μm in thickness and 200 mm in width made of PP (Poly propylene) having a negative tendency of triboelectric charging. The film 5 is guided by a plurality of guides 10 provided outside the air passage, and arranged so as to cross the air passage 3 a plurality of times. The films 5 are arranged in a plurality of layers at a constant interval in the air passage 3. Each guide 10 is a stainless steel rod having a diameter of 10 mm, and the films 5 are arranged to cross the air passage 3 at intervals of 10 mm. A plurality of slits 11 having a width of 1 mm, through which the film 5 passes, are provided on the side surface of the air passage 3. The film 5 is conveyed from the unwinding unit 7 to the winding unit 8 along a series of paths (point A to point B in the drawing) traversing the inside of the air passage 3.

The unwinding unit 7 and the winding unit 8 are disposed in spaces opposite to each other with the air passage 3 interposed therebetween. A film roll, in which an unused film 5 is wound around a winding core, is attached to the unwinding unit 7, and a winding core or winding for winding the used film 5 to which dust 2 adheres is wound on the winding unit 8. A film roll wound on a core is attached. The winding unit 8 is provided with a servomotor for controlling the number of rotations, and the used film 5 is wound up by the rotation of the winding unit 8, and the unwinding unit 7 is rotated along with this and the unwinding unit 7 Unused film 5 is pulled out.

The friction body 6 is a brush of PA6 (polyamide 6) fiber having a tendency of positive triboelectric charging, the fiber diameter of the brush is 0.2 mm, and the thickness is 10 mm. The friction body 6 is provided between the unwinding portion 7 and the air passage 3 and frictionally charges the film 5 before the film 5 delivered from the unwinding portion 7 is supplied to the air passage 3. The friction members 6 are respectively provided on both sides of the film 5 and rub each other on one side of the film 5.

Further, the ground conductor 12 is disposed on the opposite side of the friction body 6 with the film 5 interposed therebetween. The ground conductor 12 is a block of stainless steel having a thickness of 10 mm electrically grounded, and disposed so as to face the friction member 6 so as to sandwich the film 5. The ground conductor 12 and the friction body 6 are fixed to the device by bolts.

In addition, a partition member 13 is installed between the air passage 3 and the unwinding unit 7.

Next, the operation of the dust collection device 1 according to the first embodiment will be described. When the dust collection device 1 is operated for the first time or after stopping for a long time, for example, for more than one month, the film exchange mode is executed. In the film exchange mode, the winding unit 8 and the unwinding unit 7 are rotated by an instruction from the control unit 9 to wind the film 5 in the air passage 3 onto the winding unit 8 and unused from the unwinding unit 7 Film 5 is drawn toward the air passage 3 at a speed of 50 mm / s. The film 5 drawn out from the unwinding portion 7 is rubbed by the friction member 6 on both sides and charged and supplied to the air passage 3. The film 5 is folded back by the guide 10 and traverses the air passage 3 a plurality of times, and the film 5 is arranged in the air passage 3 so as to form a plurality of layers at regular intervals.

When the unused film 5 reaches the air passage 3, the rotation of the winding unit 8 and the unwinding unit 7 is stopped. The control unit 9 controls the timing for stopping the rotation. For example, from the total length of the film 5 crossing the air passage 3 (film length from point A to B in FIG. 1), the roll diameter of the film 5 and the roll thickness, all used films of the air passage 3 are unused The number of rotations of the winding unit 8 required to replace the film is determined in advance. When the number of rotations of the winding unit 8 reaches a specified value, the control of the control unit 9 stops the rotation of the winding unit 8. Thus, the film exchange mode ends.

After the film exchange mode ends, dust-laden air is allowed to pass through the air passage 3 to start dust collection. In the air passage 3, air flows in the ventilation direction 14 which is the depth direction in the drawing. At this time, the unwinding unit 7, the winding unit 8, and the film 5 are stationary by the control unit 9. When air passes through the air passage 3, dust 2 in the air is electrostatically attracted and collected on the surface of the film 5 by the electrostatic field formed by the charge of the film 5 disposed in the air passage 3.

The dust collection rate in the air gradually decreases as the collected dust 2 is accumulated on the film 5. The rate of decrease of the collection rate of the film 5 varies depending on the dust concentration in the air, temperature, and humidity, but after several tens of use, the collection rate of the film 5 decreases from 0.7 to 0.4. When dust 2 deposits on the surface of film 5, the electric resistance of dust 2 is lower than that of film 5, so the apparent electric resistance of the surface of film 5 decreases, and the charge due to the triboelectric charging of film 5 passes through dust 2. Conduct and leak outside the device. Further, by covering the surface of the film 5 with the dust 2, the electrostatic field on the surface of the film 5 is shielded. By the above mechanism, the collection rate of the film 5 due to the electrostatic field decreases with the passage of time.

The decrease in the collection rate is detected using the particle sensors 15 installed on the upstream side and the downstream side of the air passage 3 respectively. The particle sensor 15 is a sensor that measures the concentration of dust (PM 2.5) by the light scattering method, measures the dust concentration on the upstream side and the downstream side of the air passage 3, and transmits the measurement result to the control unit 9 via a cable. Send. The control unit 9 calculates the collection rate E from the following equation (1).

Here, M ₁ is the downstream of the filter, and M ₂ is the particle concentration [g / m ³ ] upstream of the filter.

In the first embodiment, assuming that the velocity of air passing through the air passage 3 is 0.5 m / s, the collection rate E immediately after triboelectric charging is approximately 0.7. If the value of the collection rate of the dust collection device 1 calculated in the control unit 9 falls below a preset threshold value (0.4 in the present embodiment), the dust collection device 1 receives an instruction from the control unit 9. In the film exchange mode, the used film 5 to which the dust 2 is attached is taken up by the winding unit 8 and the unused film 5 is supplied from the unwinding unit 7. As a result, the collection rate can be easily recovered, and dust collection can be performed again at a high collection rate. In addition, since the used film 5 to which the dust 2 is attached is periodically carried out of the air path, it is possible to suppress an increase in pressure loss over time due to clogging of the air path 3 with the accumulated dust 2. it can. As described above, by regularly executing the film exchange mode, maintenance such as electrode cleaning can be made unnecessary until the film roll attached to the unwinding unit 7 is exhausted.

Here, the film use length for one film change, that is, the film length from the point A immediately after the film 5 is fed out from the unwinding portion 7 to the point B immediately before being wound up by the winding portion 8 in FIG. M [m], maintenance interval (time until the film roll attached to the unwinding unit 7 is exhausted) T ₁ [hr], execution interval of film exchange mode (collection rate is specified value after film exchange) Assuming that T ₂ [hr] is the time taken to reduce the film thickness to the maximum, the required total film length L [m] is expressed by the following equation (2).

Once the total film length L is determined, the diameter D [m] of the film roll can be expressed by the following equation (3).

Here, t [m] is the film thickness, and d [m] is the diameter of the core.

Generally, since the life of the air conditioner installed together with the dust collection device is about 10 years, it is preferable to provide a film for 10 years in the dust collection device to eliminate maintenance. Assuming 12hr average operating time of the day, maintenance intervals _{T 1} becomes 12hr × 365day × 10year = 43800hr. Time taken for the collection rate is lowered to a prescribed value differs depending on the operating environment, when the distance T ₂ of the film replaced with 500 hr, to unnecessary the maintenance is necessary automatic film replacement of 88 times. Here, when the film length M from the point A to the point B in FIG. 2 is 10 m, the total film length L is 876 m. From the equation (3), when the core diameter d is 0.03 m, the film roll diameter D is 0.4 m. If a film roll having a diameter of 0.4 m is provided, maintenance can be eliminated.

Further, in the dust collection device of the first embodiment, the energy stored in the space sandwiched by the film 5 is 1 mJ or less due to the charge generated by the frictional charging. Since this is sufficiently small compared to the energy of several tens of mJ required for the normal ignition, the discharge due to the accumulated charge between the films under the atmosphere where the flammable gas or dust exists between the films 5 temporarily Even if a fire occurs, the possibility of triggering a fire is extremely low. In addition, since there is no corona discharge, there is no concern that ozone may be generated, which may cause health problems. Therefore, according to the dust collection device of the present embodiment, the risk of fire and ozone generation can be further suppressed as compared with the conventional electrostatic precipitator using corona discharge or electrostatic field.

As described above, according to the dust collection device of the first embodiment, the film 5 charged by friction is disposed in the air passage 3 for dust collection, and the used film 5 to which the dust 2 is attached is wound. Since the unused film 5 is wound from the unwinding unit 7 and charged by friction and supplied to the air passage 3 while being taken up by the take-up unit 8, a dust collection device with a long maintenance interval can be realized.

Further, in the dust collection device according to the first embodiment, the amount of charge of the film 5 can be further increased by sandwiching the film 5 between the friction member 6 and the ground conductor 12 and rubbing the film 5. This point will be described below.

In a region where the film 5 is sandwiched between the friction body 6 and the ground conductor 12, the ground conductor 12 and the film 5 are in contact with each other, but microscopically, a slight gap is partially generated. For this reason, a capacitor is formed in the gap between the ground conductor 12 and the film 5, and the film 5 partially obtains a high capacitance.

Here, assuming an ideal capacitor in the gap between the ground conductor 12 and the film 5, the film surface potential V [V], the film charge amount Q [C], and the film capacitance C [F] The relationship of can be expressed by the following equation (4).

As the capacitance C increases, the charge amount Q that the film 5 can store increases. By rubbing the film 5 with the friction body 6 in a state where the partial capacitor as described above is formed and the capacitance C is increased, the film 5 can obtain a higher charge amount.

Since the capacitor as described above is formed only in the microscopic gap formed between the ground conductor 12 and the film 5 in contact, when the film 5 moves by unwinding and winding, the ground conductor 12 On the part of the surface of the film 5 where the contact with it is released, the capacitor is removed and the capacitance is immediately reduced. On the other hand, the high charge of the partial surface of the film 5 applied with the increased capacitance is not immediately lost. Therefore, as represented by the above-mentioned formula (4), a high surface potential is expressed in the film 5, and an electrostatic field of high electric field strength is formed. Thus, particles in the air can be collected more efficiently than in the case where the ground conductor 12 is not provided.

In the first embodiment, an example in which the film is sandwiched between the ground conductor 12 made of a stainless steel block and the friction body 6 is shown, but the present invention is not necessarily limited to this. For example, a grounded friction body may be used as the ground conductor 12.

Moreover, since the dust collection device of the first embodiment is provided with the unused film in a roll state, adhesion of dust and water to the unused film can be suppressed. As described above, the dust collection device of the present invention aims to eliminate the need for maintenance over a long period of time. Usually, when an unused film is stored in a dust collection device for a long period of time, fine dust and water adhere to the unused film and deteriorate. On the other hand, in Embodiment 1, by providing the unused film as a roll, even if dust or water adheres to the film of the uppermost layer of the roll, the film lower than the uppermost layer is covered with the film of the upper layer. Since it is protected from the adhesion of fine dust and water, the adhesion of dust and water to the unused film can be suppressed even if the film is placed outside the air passage for a long time.

In addition, when fine dust or water adheres to the surface of the unused film, the electrical resistance of the film surface decreases. As described above, when the film is sandwiched between the friction member 6 and the ground conductor 12 for friction, the film in a state in which the electrical resistance is lowered loses charge immediately via the ground conductor 12 even if it is frictionally charged. It can not be charged. In the present invention, by providing the unused film in the state of the film roll, the film under the uppermost layer of the roll is protected from the adhesion of dust and water, so the unused film is collected in the dust collection device for a long time. Even if the film is placed, the reduction in film resistance can be suppressed, and the loss of charge via the ground conductor 12 can be suppressed.

Further, in the dust collection device according to the first embodiment, since the partition member 13 is installed between the air passage 3 and the unwinding portion 7, the dust collection device according to the first embodiment scatters from dust in the air passing through the air passage 3 and the film 5 during use. Dust can be prevented from adhering to the unused film 5 disposed in the unwinding unit 7. The partition member 13 may be provided between the air passage 3 and the winding unit 8. In this case, dust is prevented from scattering from the used film taken up by the winding unit 8 and adhering to the film in use disposed in the air passage 3 and the unused film disposed in the unwinding unit 7 it can.

In the first embodiment, an example in which the film 5 is a PP film has been described, but the material is not limited thereto and any material that can be charged by friction with the friction body 6 may be used. For example, PTFE (Polytetrafluoroethylene) or PE (polyethylene) ) Films can also be used. Also, the thickness of the film does not necessarily have to be 80 μm. For example, a film of 20 μm to 1 mm in thickness can be used. If the strength of the material allows, the thinner the film, the better. By using a thin film, the film for the required maintenance interval can be provided more compactly in the dust collection device.

Further, in the first embodiment, an example in which the friction body 6 is a brush of PA6 fiber is shown, but a PAN (Polyacrylonitrile) fiber brush or the like may be used. It is preferable that the conductivity of the friction body 6 is high in order to suppress charge saturation of the friction body 6, and the conductivity may be imparted by using a material provided with carbon as the material. The friction body 6 does not necessarily have to have a brush shape, and may have a sponge shape, a plate shape, a columnar shape, a film shape, a non-woven shape, or the like.

In the first embodiment, an example is shown in which the film 5 is rubbed on one side at a time, but both sides may be rubbed simultaneously. For example, the film 5 can be sandwiched by a plurality of friction members 6 so that both surfaces can be rubbed simultaneously. Thereby, the installation space of the friction body 6 can be saved.

In the first embodiment, the film 5 is negatively charged, but the film 5 may be positively charged. For example, the material of the film 5 may be PA 6 having a strong positive charge tendency, or the material of the friction body 6 may be made of PTFE having a strong negative charge tendency.

In the first embodiment, the guide 10 is a stainless steel rod having a diameter of 10 mm, and the film 5 is placed along the guide 10 so as to cross the air passage 3 at intervals of 10 mm. The spacing of the film across the air path, i.e. the diameter of the guide 10, is not limited to 10 mm. The smaller the diameter of the guide 10, the narrower the distance between the films, and the shorter the moving distance of dust particles to the film surface direction by electrostatic force, which is important for collection, so that the collection rate can be improved. However, since the amount of film disposed in the air passage increases, the guide diameter and the guide arrangement may be determined according to the required collection rate and the limitation of the cost.

Further, in the first embodiment, the collection rate E is calculated from the concentration of the collection target particles in the air detected by the particle sensor 15 provided on the upstream side and the downstream side of the air passage 3, Although control is performed to execute the film exchange mode when the rate E falls below the threshold, the control method is not necessarily limited to this. For example, the film exchange mode may be executed based on the difference in density between the upstream side and the downstream side, or a particle sensor may be provided only on the downstream side of the air passage, and the film exchange mode may be It may be executed. In addition, it is also possible to set so that the film exchange mode is executed every predetermined time without using the particle sensor.

As described above, according to the dust collection device of the first embodiment, the film charged by friction is disposed in the air passage for dust collection, and the used film with dust attached thereto is wound by the winding unit 8 In addition to the configuration in which an unused film is discharged from the unwinding portion and charged by friction and supplied to the air passage, a dust collection device with a long maintenance interval can be realized.

Second Embodiment
FIG. 2 is a schematic cross-sectional view showing the structure of a dust collection device according to a second embodiment. The dust collection device according to the second embodiment is different from the dust collection device according to the first embodiment in that a positively charged film and a negatively charged film are disposed opposite to each other in the air passage 3, and the other parts are the same. Hereinafter, differences will be mainly described.

The dust collection device of the second embodiment is provided with a plurality of film units each consisting of a film, an unwinding portion 7 and a winding portion 8, and a part of the film unit is positively charged by friction with the friction body 6. The other part is provided with a second film 17 which is negatively charged by friction with the friction body 6. Examples of the first film 16 include polyamide (PA6) having a strong tendency to frictional charge to the positive side, and examples of the second film 17 include polypropylene (PP) having a strong tendency to triboelectric charge to the negative.

The first film 16 and the second film 17 are disposed to face each other in the air passage. In addition, when there are three or more film units, the method of arrangement | positioning of the 1st film 16 and the 2nd film 17 is not specifically limited, You may arrange in positive / negative alternately, or you may replace every two or more You may increase the number of one or the other.

When the film in the air passage 3 is replaced, the winding unit 8 and the unwinding unit 7 of each film unit are rotated and unused from each unwinding unit 7 as in the film replacing mode shown in the first embodiment. The film is sent to air path 3 at a speed of 50 mm / s. Each film is rubbed on both sides by the friction member 6, charged, and supplied into the air passage. At this time, the first film 16 is positively charged by the friction with the friction body 6, and the second film 17 is negatively charged by the friction with the friction body 6.

Generally, on the positively charged film, negatively charged particles among particles to be collected in the air are collected, and on the negatively charged film, positively charged particles are collected. When only one of the positive and negative films is used, the collected particles are also biased to one of positive and negative, and the other particles can not be collected sufficiently.

On the other hand, in the dust collection device of the second embodiment, since both the first film 16 and the second film 17 are provided, negatively charged particles are collected on the first film 16, Since it becomes possible to collect positively charged particles on the second film 17 and it becomes easy to collect the particles to be collected regardless of which particle is charged, only one type of film was used. A high collection rate is obtained compared to the case.

Further, the average electric field intensity E [V / m] in the region between the first film 16 and the second film 17 in the air passage 3 is expressed by the following equation (5).

Here, _{+ +} is the charge density of the first film 16 [C / m ² ], ρ ₋ is the charge density of the second film 17 [C / m ² ], and _{0 0} is the dielectric constant of vacuum 8.85 × It is 10 ^-12 [F / m].

As shown in equation (5), charging the density [rho of the first film 16 of the charge density [rho ₊ and the second film 17 _- the larger, increases the average electric field strength E in the air passage 3, a high electrostatic Target collection rate is obtained. According to the equation (5), when the films made of the same material are disposed opposite to each other, the average electric field strength is theoretically zero, but in fact, the charge amount of the film surface varies depending on the location. In fact, a constant average field strength exists because

As described above, in the dust collection device according to the second embodiment, since the positively charged first film and the negatively charged second film are disposed to face each other, only one type of film is used. In this case, even if the particles to be collected are positively or negatively charged, they can be collected more easily, so that a higher collection rate can be obtained. In addition, the average electric field strength in the air passage 3 can be increased, and a higher collection rate can be obtained.

The type of friction body 6 may be changed between the first film 16 and the second film 17. For example, the first film 16 has a first friction member 18 and a second film 17 which have a stronger tendency to negatively charge by friction than the first friction member 18 and the second film 17 have a positive friction charge than the first friction member 18. By rubbing using the second friction body 19 made of stronger PA6, each film can be charged more efficiently.

Third Embodiment
FIG. 3 is a schematic cross-sectional view showing the structure of the dust collection device according to the third embodiment. The dust collection device according to the third embodiment is different from the first embodiment in that the dust collecting device according to the third embodiment includes a drying unit 20 for drying the film, and the other points are the same as the first embodiment. Hereinafter, differences will be mainly described.

As shown in FIG. 3, the dust collection device of the third embodiment includes drying means 20 for drying the film 5. The drying means 20 is to dry the film 5 delivered from the unwinding unit 7 before rubbing by the friction body 6. Here, the drying means 20 is a metal plate-like hot wire heater.

When the film in the air passage is replaced, the winding unit 8 and the unwinding unit 7 are rotated in the same manner as in the film exchange mode shown in the first embodiment, and the unused film is passed through the air passage 3 from the unwinding unit 7. It sends it out at a speed of 50 mm / s. At this time, before rubbing the film 5 with the friction body 6, the metal plate which is the drying means 20 is heated to 80 ° C., and when the film 5 passes between the plates, the surface of the film 5 is dried by contact heating. As a result, the moisture on the surface of the film 5 evaporates and the surface resistance of the film 5 increases, so that the attenuation of the charge due to the conduction to the outside through the ground conductor 12 or the like is suppressed, and high charge can be maintained. Also, this makes it possible to stably maintain high charging regardless of the humidity of the atmosphere.

The temperature of the drying means 20 is not limited to 80 ° C., and may be a temperature lower than the melting point of the film 5. A higher temperature is preferable because the film 5 can be efficiently dried.

Further, the type of the drying means 20 is not limited to the metal plate heater, and other heating means or drying means other than heating may be used. For example, the film may be dried by sending hot air toward the surface of the film with a drier, or by providing a compressor-type or desiccant-type dehumidifying device in a space outside the air path and blowing air. In either case, it is configured to dry the film prior to rubbing by the friction body 6.

As described above, according to the third embodiment, the surface resistance of the film 5 is increased by drying the film 5 by the drying unit 20 before the friction by the friction body 6, thereby suppressing the charge decay. , Can maintain high charge.

Fourth Embodiment
In the fourth embodiment, the dust collection device 1 of the first embodiment is incorporated in an air conditioner. The air conditioner of the present embodiment includes a heat exchange ventilator. A heat exchange ventilator is a type of air conditioner, and is added to a ventilation function that supplies outdoor air to the room and exhausts the indoor air to the room, recovers heat from the air to be exhausted, and heats the air to be supplied. The ventilation system also has an energy saving function to reduce the energy burden of an apparatus such as an air conditioner that adjusts the room temperature.

The schematic of the air conditioner of Embodiment 4 is shown in FIG. The air conditioner according to the fourth embodiment includes the dust collection device 1 described in the first embodiment and a heat exchange ventilator 21. The dust collection device 1 and the heat exchange ventilator 21 are housed in the lower ceiling 22 of the room of the house. The lowered ceiling 22 indicates an area where a part of the ceiling is lowered as shown in FIG. From the point of view of the indoor aesthetics, there are many houses that collect and store air conditioners in the ceiling 22 as shown in FIG. When the device is installed in the lowered ceiling 22, a wider installation space can be secured compared to the case where the device is generally installed indoors.

In FIG. 4, an outdoor air supply port 23 and an outdoor exhaust port 24 are provided on the outdoor wall surface, and an indoor air supply port 25 and an indoor exhaust port 26 are provided on the indoor ceiling 22. The outdoor air supply port 23 and the indoor air supply port 25, and the outdoor exhaust port 24 and the indoor exhaust port 26 are connected by the duct 31 via the heat exchange ventilator 21. The heat exchange ventilator 21 includes two fans for blowing air from the outside to the inside and from the outside to the outside, and operates the fans to supply and discharge the air into the room.

The dust collection device 1 is disposed between the heat exchange ventilator 21 and the outdoor air supply port 23 and connected by a duct 31. The side of the dust collection device 1 connected to the outdoor air supply port 23 is the upstream side of the flow of the air, and outdoor air flows in the dust collection device 1 in the ventilation direction 14 (right direction in the drawing). A particle sensor 15 is provided on the upstream side and the downstream side of the dust collection device 1 for sensing the dust concentration of air. Furthermore, the dust collection device 1 includes a control unit 9 that controls the operation of the dust collection device 1. The dust collection device 1 and the heat exchange ventilator 21 are electrically connected to the control unit 9 in order to link the operation.

Next, the operation of the air conditioner according to Embodiment 4 of the present invention will be described. FIG. 5 shows a flowchart of the operation. When the apparatus is operated for the first time or after stopping for a long time, for example, for one month or more, the film exchange mode is executed as in the first embodiment to rotate the unwinding unit 7 and the winding unit 8 and wind the used film. Take out and supply unused film. In the film exchange mode, the fan of the heat exchange ventilator 21 is stopped by the control of the control unit 9.

Next, the fan of the heat exchange ventilator 21 is operated to start ventilation. At this time, the air taken in from the outside flows in the direction of the ventilation direction 14 in the air passage 3 of the dust collection device 1. At this time, 7, the winding unit 8 and the film 5 are at rest under the control of the control unit 9. When air passes through the air passage 3, dust in the air is electrostatically attracted and collected on the surface of the film 5 by the electrostatic field formed by the charge of the film 5 disposed in the air passage 3.

During operation of the apparatus, as in the first embodiment, the dust concentration in air is detected by the particle sensors 15 provided upstream and downstream of the air passage, and the collection rate E is calculated. When the value of the collection rate E falls below the set value (0.4 in the present embodiment), the film exchange mode is started by a command from the control unit 9, and the unwinding unit 7 and the winding unit 8 are rotated. Take up used film and supply unused film. As a result, it is possible to perform dust collection again at a high collection rate. As described above, by regularly executing the film exchange mode, maintenance such as electrode cleaning can be made unnecessary until the film roll attached to the unwinding unit 7 is exhausted. For example, by providing a film roll for 10 years in the unwinding portion 7, maintenance for 10 years can be made unnecessary.

Further, as shown in FIG. 6, an air filter 27 may be provided on the downstream side of the dust collection device 1. The air filter 27 is, for example, a HEPA filter formed by molding a melt-blown charged nonwoven fabric of PP into a pleated shape. Although HEPA filters have high dust collection rates, maintenance (filter replacement) every few months is recommended because the fiber density is high, and the collected dust relatively quickly clogs and pressure loss increases. By disposing the air filter 27 on the downstream side of the dust collection device 1, the dust load on the air filter 27 can be reduced by removing the dust upstream of the air filter 27. As a result, the increase in pressure loss due to clogging of the air filter 27 becomes moderate, so that the high dust collection rate of the air filter 27 can be exhibited for a long time, and the maintenance interval of the air filter 27 can be lengthened. .

As described above, according to the air conditioner of the fourth embodiment, by using the dust collection device of the first embodiment, a dust collection device having a long maintenance interval can be realized. In addition, when it is assumed that the ceiling-embedded air conditioner according to the fourth embodiment is used without maintenance for a long time, the risk of fire and ozone generation is particularly low because high voltage is not used. It is a great advantage.

Embodiment 5
In the sixth embodiment, the dust collection device 1 of the first embodiment is incorporated in an air conditioner different from the fourth embodiment. FIG. 7 shows a schematic cross-sectional view of the air conditioner according to the sixth embodiment.

As shown in FIG. 7, in the present embodiment, the air conditioner is a room air conditioner that adjusts the temperature and humidity of the room, and the room air conditioner drops the air conditioner indoor unit 28 in the ceiling 22 and the outdoor air conditioner outdoor unit 29. It consists of The dust collection device 1 is connected to the lower part of the air conditioner indoor unit 28 in the lower ceiling 22.

Next, the operation of the air conditioner according to the fifth embodiment will be described. By operating the air conditioner indoor unit 28, air is taken in from the room by the rotation of the air conditioner indoor unit 28 fan and flows in the air flow direction in the air path of the dust collection device 1. When air passes through the air passage 3, dust in the air is electrostatically attracted and collected on the surface of the film 5 by the electrostatic field formed by the charge of the film 5 disposed in the air passage 3. The clean air from which dust has been removed is taken into the air conditioner indoor unit 28 and is cooled or warmed by the heat transfer from the refrigerant pipe provided in the air conditioner indoor unit 28 and released into the room.

Then, the film exchange mode is periodically executed as in the first embodiment, and the unwinding unit 7 and the winding unit 8 are rotated to wind the used film and supply the unused film. Thus, maintenance such as electrode cleaning can be made unnecessary until the film roll attached to the unwinding unit 7 is exhausted. For example, by providing a film roll for 10 years in the unwinding portion 7, maintenance for 10 years can be made unnecessary.

As described above, according to the air conditioner of the fifth embodiment, by using the dust collection device 1 of the first embodiment, a dust collection device having a long maintenance interval can be realized. In addition, when it is assumed that the ceiling-embedded air conditioner as in the fifth embodiment is used without maintenance for a long time, the risk of fire and ozone generation is particularly low because high voltage is not used. It is a great advantage.

Sixth Embodiment
The dust collection device according to the sixth embodiment further includes a fan 30 in the dust collection device 1 according to the first embodiment.

FIG. 8 is a schematic cross-sectional view showing the structure of the dust collection device according to the sixth embodiment. As shown in FIG. 8, the dust collection device of the present embodiment includes a fan 30 for generating an air flow passing through the air passage 3. By operating the fan 30, indoor air is taken into the air passage 3 and flows in the ventilation direction 14. When the air passes through the air passage 3, dust in the air is collected on the surface of the film 5 by the electrostatic field formed by the film 5, and clean air with reduced dust is released into the room.

Then, the film exchange mode is periodically executed as in the first embodiment, and the unwinding unit 7 and the winding unit 8 are rotated to wind the used film and supply the unused film. By regularly executing the film exchange mode, maintenance such as electrode cleaning can be made unnecessary over a long period of time until the film roll attached to the unwinding unit 7 is exhausted. For example, by providing a film roll for 10 years in the unwinding portion 7, maintenance for 10 years can be made unnecessary.

As described above, according to the dust collection device of the sixth embodiment, a dust collection device with a long maintenance interval can be realized. Furthermore, dust collection can be performed with a single dust collection device without being connected to another air conditioner.

As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to this. Within the scope of the invention, it is possible to freely combine each embodiment and its modification, and to appropriately modify or omit each embodiment.

1 Dust collection device,
2 Dust,
3 windways,
4 cases,
5 film,
6 friction body,
7 reels,
8 winding units,
9 control unit,
10 guides,
11 slits,
12 ground conductors,
13 partition members,
14 ventilation direction,
15 particle sensors,
16 First film,
17 Second film,
18 First friction body,
19 Second friction body,
20 drying means,
21 heat exchange ventilation system,
22 down the ceiling,
23 outdoor air inlet,
24 outdoor exhaust,
25 indoor air inlets,
26 indoor exhaust,
27 air filter,
28 air conditioner indoor units,
29 air conditioner outdoor unit,
30 fans,
31 duct

Claims

A housing with an air path through which the air passes;
A film charged by friction and transported along a path crossing the air path;
An unwinding unit for feeding the film into the air passage;
A friction body that frictionally charges the film delivered from the unwinding portion;
A winding unit configured to wind the film conveyed into the air passage;
Dust collection device.
A control unit that periodically executes a film exchange mode in which the film transported into the air passage is wound around the winding unit, and the unused film is supplied from the unwinding unit into the air passage. Equipped
The dust collection device according to claim 1.
A particle sensor for detecting the concentration of particles to be collected in the air passing through the air passage;
The control unit executes the film exchange mode based on the detected concentration.
The dust collection device according to claim 2.
The particle sensors are respectively provided on the upstream side and the downstream side of the air passage,
The control unit executes the film exchange mode when the collection rate calculated from the concentration detected by each particle sensor falls below a threshold.
The dust collection device according to claim 3.
A partition member is provided between the air passage and the unwinding portion,
The dust collection device according to any one of claims 1 to 4.
A ground conductor disposed in contact with the film is provided on the side opposite to the friction body with the film interposed therebetween.
The dust collection device according to any one of claims 1 to 5.
A plurality of guides for guiding the film so that the film traverses the air passage a plurality of times;
The dust collection device according to any one of claims 1 to 6.
A first film unit including: a first film positively charged by friction with the friction body; an unwinding unit supplying the first film; and a winding unit winding the first film. ,
A second film unit including a second film negatively charged by friction with the friction body, an unwinding unit supplying the second film, and a winding unit winding the second film; , And
The first and second film units are disposed such that the first film and the second film face each other in the air passage.
The dust collection device according to any one of claims 1 to 7.
As the friction body, a first friction body that rubs the first film, and a second friction body that rubs the second film and that has a stronger positive charge than the first friction body With
The dust collection device according to claim 8.
Drying means for drying said film prior to rubbing by said friction body,
The dust collection device according to any one of claims 1 to 9.
An air filter is provided downstream of the air passage,
The dust collection device according to any one of claims 1 to 10.
A housing with an air path through which the air passes;
A film which is transported along a path crossing the air path and which is charged by friction;
An unwinding unit for feeding the film into the air passage;
A friction body that frictionally charges the film delivered from the unwinding portion;
A winding unit for charging and winding the film transported into the air passage;
And a blower configured to generate an air flow passing through the air path.
Air conditioner.
Installed inside the ceiling of the room,
The air conditioner according to claim 12.