JP2010104831A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner with small pressure loss of air suction, capable of suppressing decrease of the volume of air suction, collecting dust with relatively lighter weight and being safely used. <P>SOLUTION: The vacuum cleaner includes a suction opening for sucking dust together with the suction air, a motor-driven blower 8 for generating the suction air, a suction passage communicating with the blower 8 from the suction opening, an exhaust passage 9 from the blower 8 to the outside and a first and a second dust collecting means 53 and 7 provided midway through the suction passage along the air flow and for collecting dust. The second dust collecting means 7 is housed inside the first dust collecting means 53. Both of the means 53 and 7 include a cyclone dust-collecting part utilizing a centrifugal-force function respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum cleaner mainly used at home, and more particularly to a configuration of dust collecting means of the vacuum cleaner.

  Conventionally, the widely used vacuum cleaner is disclosed by patent document 1, for example. This disclosed vacuum cleaner has a function of collecting dust in the accumulation chamber by drawing dust into the cyclone dust collecting section by an electric blower and turning it, and separating the dust from the air flow by applying centrifugal force to the dust. have.

  Non-Patent Document 1 describes a cyclone dust collector that improves performance. In this cyclone dust collecting device, by providing the discharge electrode and the dust collecting electrode in the cyclone, it also has a so-called electric dust collecting function, and in addition to the centrifugal force action on the dust, by adding the Coulomb force action, The dust collection ability is improved.

JP 2003-88485 A

"Research on performance improvement of electrocyclone" Ryo Nakajima, Tsuneo Watanabe: Proceedings of the 2004 Annual Conference of the Institute of Electrical Engineers of Japan (pp.263-264, 4th volume)

As described above, the conventional vacuum cleaner equipped with a cyclone dust collecting unit is based on the principle of separating and removing dust by applying centrifugal force, so that it is difficult to collect particles having a small weight. This is because the centrifugal force Z when the particles are in a complete circular motion,
Z = m · U ² / r (1)
(m: particle mass, U: peripheral speed, r: radius of circular orbit)
By being proportional to the particle mass m.

  Therefore, if the dust collecting means is only the cyclone dust collecting part, a lot of small particles are contained in the exhaust to the outside of the vacuum cleaner. Therefore, in the vacuum cleaner equipped with the cyclone dust collecting part, on the downstream side of the cyclone dust collecting part. A filtration filter is provided to collect small particles and dust left behind by the cyclone dust collecting unit.

  However, if a filtration filter is added, the pressure loss of the intake air increases, so that the amount of intake air decreases in the blower having the same performance. In addition, when a large amount of dust is collected by the filtration filter as described above, there is a problem that the filtration filter is likely to be clogged and the intake air amount is further reduced.

  On the other hand, in the cyclone dust collector provided with the electric dust collection function described in Non-Patent Document 1, high-efficiency and relatively small particles are collected by applying the Coulomb force to the dust in addition to the centrifugal force. I can do it. For this reason, a filtration filter can be omitted, and even if a filtration filter is arranged, the burden is small and clogging is unlikely to occur.

  By the way, the discharge electrode for charging the dust of the cyclone dust collector having the electric dust collecting function needs to generate a corona, and a high voltage of several kV or more is applied, so that the user can directly touch A vacuum cleaner is dangerous. Also, depending on the type and size of dust, it may be dangerous. In other words, in household vacuum cleaners that may attract string-like objects such as hair and metal, there is a risk of overcurrent due to electric shock, short circuit, and insulation reduction, and a cyclone equipped with an electric dust collection function There was a problem that the dust collector could not be applied.

  In general, an electric electrostatic precipitator is generally used at an air flow rate of 10 m / second or less, and at higher flow rates, the collection rate is greatly reduced. However, the current household vacuum cleaner has a problem that the improvement in performance cannot be expected even if the electric dust collector is applied as it is because the flow velocity of the intake air reaches 25 m / sec or more.

  In the cyclone dust collecting device having an electric dust collecting function described in Non-Patent Document 1, in addition to the centrifugal force and the Coulomb force acting on the dust, the flow velocity is reduced in a turbulent part or the like in the cyclone. Therefore, it is possible to suppress the decrease in the electrostatic dust collection function, but a sufficient collection rate has not yet been obtained.

  In addition, the flow velocity distribution is uneven in the swirl chamber compared to the inflow path to the cyclone dust collecting section, and the dust distribution varies, so it is necessary to design the electrodes so that the dust can be charged stably. There is a problem that it is difficult.

  The discharge electrode of the electrostatic precipitator forms a corona ionization region due to a large electric field strength in the vicinity thereof. For this purpose, it is necessary to reduce the electrode surface area so that the lines of electric force are concentrated. On the other hand, the larger the corona ionization region, the greater the amount of charge on the dust. Therefore, a linear discharge electrode is often used as a shape that meets these conditions. However, since the mechanical strength is low, the electrode is held in order to place it in the inflow path to the cyclone dust collecting part. There is a problem that restrictions such as the need for members arise.

  Further, in this inflow path, since centrifugal force is not yet applied to the dust, there is a possibility that the large dust collides with the discharge electrode without being separated from the air, and the discharge electrode is damaged. In addition, since the main body of the vacuum cleaner moves, there is a problem that a lot of stress and vibration are generated in the discharge electrode as compared with a device installed and used in a fixed place.

  In addition, the dust separated from the air remains adhered to the dust collecting electrode or is accumulated in the accumulation chamber. Among these, the dust accumulated in the accumulation chamber is sucked up by the exhaust air and again. There is a problem of being scattered. For research or large-scale industrial applications, this problem can be avoided by increasing the depth of the accumulation room, etc., but this is an important issue for household vacuum cleaners that require miniaturization. .

  The present invention has been made in view of the above-described circumstances, and it is possible to collect dust that has a small intake pressure loss, can suppress a decrease in the intake air amount, is relatively small in weight, and is also safe. The purpose is to provide an electric vacuum cleaner that can be used in the future.

  The present invention also provides a vacuum cleaner that can be stably charged by dust and collected by a dust collecting electrode, and further can prevent re-scattering of the collected dust. The purpose is to do.

  The vacuum cleaner according to the present invention includes a suction port for sucking dust, an electric blower that generates intake air, a suction path that communicates from the suction port to the electric blower, an exhaust path from the electric blower to the outside, A first dust collecting means and a second dust collecting means that are provided in the suction path and collect dust. The first dust collecting means is a first cyclone dust collecting part by centrifugal force action, and the second dust collecting means is a second cyclone dust collecting part by centrifugal force action. The first cyclone dust collecting part also serves as a container for storing the second cyclone dust collecting part, and the container is provided with a first inlet tube through which intake air from the suction port flows tangentially to the upper part of the circumferential surface of the container. The second cyclone dust collecting portion has an outer cylinder, and a second inlet cylinder for inflowing air in a tangential direction is provided at an upper portion of the outer cylinder. One end opened to the outer cylinder penetrates, and an inner cylinder whose other end communicates with the suction path of the electric blower is provided.

  In this electric vacuum cleaner, the suction port sucks dust, and the electric blower generates intake air. The suction path communicates with the electric blower from the suction port, and the exhaust path exhausts from the electric blower to the outside. The first dust collecting means stores the second dust collecting means and collects each dust. The first and second cyclone dust collecting sections, which are the first and second dust collecting means, collect dust by centrifugal force action.

  The vacuum cleaner according to the present invention is characterized in that the second inlet tube is provided with a filter for filtering dust.

  In this vacuum cleaner, large dust is removed by the first cyclone dust collecting section and the second inlet cylinder. The intake air from which the large dust has been removed then flows into the second cyclone dust collecting section, and after the small dust has been removed, it is exhausted through the electric blower.

  Even if a fine filtration filter is provided in the exhaust path, clogging is less likely to occur even with a fine filtration filter, compared to a case where there is no function of collecting small dust upstream of the filter.

  In addition, the vacuum cleaner according to the present invention is characterized in that an accumulation chamber for collecting collected dust is individually provided below the first and second cyclone dust collecting portions.

  The electric vacuum cleaner according to any one of claims 1 to 3, wherein the electric vacuum cleaner according to the present invention is provided with electric dust collecting means by a Coulomb force in the second cyclone dust collecting portion.

  Further, in the vacuum cleaner according to the present invention, the electric dust collecting means is provided with a discharge electrode for corona discharge in the intake air to charge the dust, and the suction path of the second cyclone dust collecting portion. A part of the electrode is grounded or a voltage having a polarity opposite to that of the discharge electrode is applied.

  According to this electric vacuum cleaner, fine particle dust can be collected by the electric dust collecting means in the second cyclone dust collecting section.

  If the discharge electrode that charges the dust by this electrostatic dust collecting means is positive, the amount of ozone generated is smaller than when the discharge electrode is negative, and the intake air is moved out of the vacuum cleaner without using the ozone decomposition means. Can be discharged.

  According to the vacuum cleaner of the present invention, there is provided a vacuum cleaner that has a small pressure loss of intake air, can suppress a decrease in intake air amount, can collect relatively small dust, and can be used safely. Can be realized. Moreover, the shape of the whole vacuum cleaner can be made smaller than separately arranging another cyclone dust collecting part in the front | former stage.

  Moreover, according to the vacuum cleaner which concerns on this invention, since the electric collection part is provided in the cyclone dust collection part, a structure becomes simple and size reduction can be achieved. In addition, since dust is charged by ions generated by corona discharge, it is more efficient than the case of charging by frictional static electricity or the like, and the dust collecting ability is improved.

  According to the vacuum cleaner of the present invention, since the large dust can be reliably collected by the first dust collecting means, the electric dust collecting means to which a high voltage is applied is provided on the downstream side of the second dust collecting means. It is safe because it is placed in the collecting means.

  According to the vacuum cleaner of the present invention, since the intake air has a structure that does not transmit the dust accumulated in the first dust collecting means, the operation is continued as compared with the structure in which the dust is accumulated in the front stage of the filter. However, the suction force hardly decreases.

  According to the vacuum cleaner which concerns on this invention, since the filtration filter is added, dust collection capability improves further. When the intake air passes through the filter, small dust has already been removed in the upstream dust collecting portion, so that even if a fine filter is disposed in the exhaust path, clogging is unlikely to occur.

  According to the vacuum cleaner of the present invention, since the user does not directly touch the dust collecting part with a high voltage, safety is improved.

  According to the vacuum cleaner of the present invention, since a part of the cyclone dust collecting part is an electric collecting part, the structure is simplified and the size can be reduced.

According to the vacuum cleaner of the present invention, the dust is charged by the ions generated by the corona discharge, which is more efficient than the case of charging by frictional static electricity and the like, and the dust collecting ability is improved. According to the vacuum cleaner, it is possible to prevent a string-like object such as hair from being sucked into the electric dust collecting means by the filtration filter, and safety is improved.

It is a schematic diagram which shows the external appearance of embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the internal structure of the main body of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the internal structure of the main body in embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the internal structure of the main body in embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the internal structure of the main body in embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the internal structure of the main body in embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the internal structure of the main body in embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the cyclone dust collection part in embodiment of the vacuum cleaner which concerns on this invention. It is a schematic diagram for demonstrating the cyclone dust collection part in embodiment of the vacuum cleaner which concerns on this invention.

Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
(Embodiment 1)
FIG. 1 is a schematic diagram showing the appearance of a first embodiment of a vacuum cleaner according to the present invention.

  This vacuum cleaner includes a suction port 1 for sucking dust together with intake air, a straight suction pipe 2 having one end connected to the outlet side of the suction port 1, and one end connected to the other end of the suction pipe 2. The connecting pipe 3 is bent slightly in the middle, the bendable suction hose 4 having one end connected to the other end of the connecting pipe 3, and the main body 5 connected to the other end of the suction hose 4.

  In FIG. 1, the flow of intake air including dust is indicated by arrows, and the intake air that flows in from the suction port 1 flows through the suction path in the order of the suction pipe 2, the connection pipe 3, and the suction hose 4, and then the main body 5. Thus, the dust is removed and exhausted to the outside of the main body 5.

  FIG. 2 is a schematic diagram for explaining the internal configuration of the main body 5.

  The main body 5 includes a paper bag (filtration filter dust collecting portion) 6 having a filtration filter function as first dust collecting means, and a cyclone dust collecting means as second dust collecting means through which intake air that has passed through the paper bag 6 passes. A portion 7, an electric blower portion 8 that generates intake air, an exhaust passage 9 from the electric blower portion 8 to the outside of the main body 5, and a suction passage that connects the respective portions so that the intake air passes therethrough are provided.

  The cyclone dust collecting unit 7 includes an inlet cylinder 12, an outer cylinder 13, an accumulation chamber 14 and an inner cylinder 15 that are suction paths, a cyclone center discharge wire 16, and a high voltage generation circuit 17.

  The upper part of the outer cylinder 13 has a cylindrical shape with an upper base to which the inlet cylinder 12 is connected in the tangential direction, and the lower part has an inverted truncated cone shape. A bottomed cylindrical accumulation chamber 14 that opens to the outer cylinder 13 is provided below the outer cylinder 13, and an opening in the outer cylinder 13 extends above the center of the outer cylinder 13 from the upper bottom. The inner cylinder 15 is penetrated, and a cyclone center discharge wire 16 is stretched at the center from the lowermost part of the outer cylinder 13 to the upper end of the inner cylinder 15. A high voltage is applied to the cyclone center discharge wire 16 by a high voltage generation circuit 17.

  The upper end portion of the inner cylinder 15 is connected to the electric blower unit 8 through a suction path.

  The electric blower unit 8 includes a fan 10 that is connected to a suction path from the inner cylinder 15 and generates intake air, and a motor 11 that drives the fan 10 in the casing. The casing of the electric blower unit 8 has a sealed structure other than the inlet and outlet to which the suction path and the exhaust path 9 are connected.

  The inlet cylinder 12, the outer cylinder 13, the accumulation chamber 14, and the inner cylinder 15 are made of PET (polyethylene terephthalate) which is an insulating material. The inner wall of the inverted frustoconical portion of the outer cylinder 13 is made of a grounded aluminum material. A part of the inner wall of the inlet cylinder 12, the inner walls of the side and bottom surfaces of the accumulation chamber 14, and the inner wall of the side of the inner cylinder 15 are also made of an aluminum material that is grounded.

  As shown by the arrows in FIG. 2, the intake air containing the dust is first removed with a paper bag 6 having a filtration filter function. The dust is held in the paper bag 6 as it is, and is discarded together with the paper bag 6 when it accumulates to some extent.

  The intake air from which the large dust has been removed then flows into the cyclone dust collecting section 7 and is sucked into the electric blower section 8 after the small dust has been removed. The fan 10 of the electric blower unit 8 generates intake air, and the airflow emitted from the fan 10 reaches the exhaust path 9 and is discharged to the outside of the main body 5 while cooling the vicinity of the motor 11 and the like.

  As described above, the intake air including the dust that has flowed into the cyclone dust collecting portion 7 flows into the outer cylinder 13. Since the outer cylinder 13 has a cylindrical shape, the intake air that has flowed into the outer cylinder 13 becomes a swirling airflow, and forms a forced vortex area near the center axis and a quasi-free vortex area on the outer periphery thereof, and the outer cylinder path structure. And flow downward due to gravity.

  At this time, since the centrifugal force expressed by the formula (1) acts on the dust, the dust of 3 μm (preferably 1 μm) or more is pressed against the inner wall of the outer cylinder 13 and separated from the intake air, and the airflow descends. Along the collecting chamber 14. Thereafter, the airflow turns upward, flows through the inner cylinder 15 and the suction path, and is sucked into the electric blower 8.

  Although the main flow of the intake air is as described above, a large amount of secondary flow and turbulence are generated particularly in the vicinity of the inlet of the outer cylinder 13 and in the accumulation chamber 14, and most of these are due to centrifugal force action. This will cause a reduction in the collection capacity and cause dust to re-scatter.

  The operation of the cyclone dust collecting unit 7 described above is a collecting operation using centrifugal force acting on dust, but in parallel with this, in the cyclone dust collecting unit 7, the Coulomb force acting on dust is utilized. A collection operation is also performed. Below, the collection operation | movement using this Coulomb force is demonstrated.

  In the high voltage generation circuit 17, a voltage obtained from a commercial AC power source is boosted by a transformer, and further boosted by a voltage doubler rectifier circuit in which a diode and a capacitor are stacked in series, thereby generating a positive DC voltage of 6 kV. . By applying this +6 kV voltage to the central discharge wire 16 that is a discharge electrode, the central discharge wire 16 and the aluminum material dust collecting electrodes on the inner walls of the outer cylinder 13, the accumulation chamber 14, and the inner cylinder 15. In the meantime, a current of about 0.04 mA flows to generate a so-called corona discharge.

  At this time, the holes generated in the ionization region due to the strong electric field in the vicinity of the central discharge wire 16 positively ionize the particles in the intake air, and adhere to the dust, or directly ionize the dust in the ionization region. As a result, the Coulomb force is generated and collected in the dust with the dust collecting electrode.

  If a negative voltage is generated by the high voltage generating circuit, a large amount of negative ions are generated, and ozone is generated by this action. If this ozone rises to a certain concentration and is discharged outside the vacuum cleaner, the user feels a strange odor, so some preventive means is required. In order to avoid this, a positive voltage is applied to the center discharge wire 16 in the first embodiment.

  As explained above, the dust collecting principle by centrifugal force action and the dust collecting principle by Coulomb force action are completely different, so when acting simultaneously (in parallel), the centrifugal force The coulomb force can be added together, and the collection rate can be improved as compared with the case where each of them is operated alone, and fine particles can be collected.

  Furthermore, the operation | movement in this Embodiment 1 of the vacuum cleaner which concerns on this invention is demonstrated concretely.

The intake air that has flowed into the outer cylinder 13 collects dust of a certain size in the accumulation chamber 14 due to the centrifugal force generated by the swirling airflow. At the same time, dust is charged by corona discharge by the center discharge wire 16 and collected by the dust collecting electrodes of the outer cylinder 13, the accumulation chamber 14, and the inner cylinder 15. At this time, particularly in the charged dust, a Coulomb repulsive force is generated between the charged dust and the central discharge wire 16, so that it is easily collected by the Coulomb force between the dust collecting electrode of the inner cylinder 15. In addition, when secondary flow and turbulent flow are generated in each part, the flow velocity of these air is almost slower than that when flowing into the inlet tube 12, so that the dust is separated from the dust collecting electrodes at each location. It is easy to collect by Coulomb force between. Thereby, in this Embodiment 1 of the vacuum cleaner which concerns on this invention, dust collection with high efficiency and dust collection of a microparticle are realizable.
(Embodiment 2)
FIG. 3 is a schematic diagram for explaining the internal configuration of the main body 5 in Embodiment 2 of the vacuum cleaner according to the present invention.

  The main body 5 is different from the first embodiment described above in that the first dust collecting means is the cyclone dust collecting part 18 and further the filtration filter dust collecting part 19 is provided in the exhaust path 9. . The cyclone dust collection unit 18 has a configuration in which no components related to electric dust collection are present in the cyclone dust collection unit 7 of the first embodiment, and particularly includes a detachable accumulation chamber 20 instead of the accumulation chamber 14. .

  The flow of intake air including dust is indicated by arrows, and first, large dust is removed by the cyclone dust collecting unit 18. Since the cyclone dust collecting unit 18 is intended to remove large dust, it has a structure in which only normal centrifugal force acts. Only dust of 3 μm (preferably 1 μm) or more is collected and collected in the accumulation chamber 20. It is done. Since the accumulation chamber 20 is detachable, dust can be easily discarded.

  Further, in such a cyclone structure, since the intake air does not pass through the dust accumulated in the accumulation chamber 20, the suction force is maintained even if the operation of the vacuum cleaner is continued as compared with the structure in which the dust is accumulated in the front stage of the filter. Is hardly reduced.

  The intake air from which large dust has been removed by the cyclone dust collecting unit 18 then flows into the cyclone dust collecting unit 7, and as described in the first embodiment, centrifugal force is applied to the dust. And since both Coulomb forces act, smaller dust can be collected.

  Thereafter, the intake air sucked into the electric blower unit 8 is sent out to the exhaust passage 9 and passes through the filtration filter dust collecting unit 19 which is a fine filtration filter. In the second embodiment, since the dust collection by the cyclone dust collection unit 7 significantly reduces the amount of dust compared to the case where the dust collection unit upstream of the filter does not have a function of collecting small dust, Even with a fine filter, clogging hardly occurs. After passing through the filtration filter dust collection unit 19, air with very little dust is discharged from the main body 5.

  As described above, in the second embodiment, it is possible to realize collection with higher efficiency and collection of fine particles. Other configurations and operations of the second embodiment of the vacuum cleaner according to the present invention are the same as the configurations and operations of the first embodiment of the vacuum cleaner according to the present invention described above. The description is omitted.

  Although the first and second embodiments have been described above, the present invention is not limited to these first and second embodiments. Although the configuration including the first and second dust collecting means in the main body 5 has been described as an example, the first and second dust collecting means are included in the present invention as long as the first and second dust collecting means are provided in the middle of the suction path. . Further, the first dust collecting means is intended to collect large particles, and it is easily conceivable to realize this by a plurality of means.

In particular, the first dust collecting means can be easily realized by simpler means. This example will be described with reference to FIG. FIG. 4 is a schematic diagram for explaining the internal configuration of the main body 5. However, the first embodiment is different from the first embodiment in that a filtration filter 30 and a dust accumulation chamber 31 are provided as the first dust collecting means. Is different. The filter 30 is made of polyester and has a mesh opening of 96 μm, and is attached to the boundary between the accumulation chamber 31 and the inlet cylinder 12. Even with such a configuration, large particles can be collected by filtration and deposited in the accumulation chamber 31.
(Embodiment 3)
FIG. 5 is a schematic diagram for explaining the internal configuration of the main body 5 in Embodiment 3 of the vacuum cleaner according to the present invention.

  The main body 5 is different from the first embodiment described above in that there is no dust collecting means including the paper bag 6 and the bottomed cylindrical container 51 stores the cyclone dust collecting portion 7. The inlet cylinder 55 of the container 51 into which intake air flows from the suction hose 4 (FIG. 1) is provided in the radial direction on the upper peripheral surface of the container 51. The container 51 has a sealed structure except for the communicating portion of the inlet tube 55 and the inner tube 15.

  The inlet cylinder 12 of the cyclone dust collection unit 7 in the container 51 is provided with a filtration filter dust collection unit 52 electrically connected to the dust collection electrode of the cyclone dust collection unit 7.

  The flow of intake air including dust first flows into the container 51, and large dust is removed by the filtration filter dust collector 52. The removed dust is held in the container 51 as it is. Here, in order to prevent large dust trapped and entangled in the filtration filter dust collection part 52 from becoming a high potential, the filtration filter dust collection part 52 is configured to be electrically connected to the dust collection electrode. Yes.

  The intake air from which the large dust has been removed then flows into the cyclone dust collecting section 7 and is sucked into the electric blower section 8 after the small dust has been removed. The fan 10 of the electric blower unit 8 generates intake air, and the airflow emitted from the fan 10 reaches the exhaust path 9 and is discharged outside the main body while cooling the vicinity of the motor 11 and the like.

  Here, as described above, a high voltage as high as 6 kV is applied to the cyclone dust collecting unit 7, and a structure that can be easily touched by the user causes a problem in terms of safety. By disposing the part 7 in the container 51, the user does not directly touch the cyclone dust collecting part 7, and safety is improved.

Thus, in Embodiment 3, safety can be improved while realizing high-efficiency collection and fine particle collection. Other configurations and operations of the vacuum cleaner according to the third embodiment of the present invention are the same as the configurations and operations of the first embodiment of the vacuum cleaner according to the present invention described above. The description is omitted.
(Embodiment 4)
FIG. 6 is a schematic diagram for explaining the internal configuration of the main body 5 in the fourth embodiment of the vacuum cleaner according to the present invention.

  The main body 5 is different from the above-described third embodiment in that a cyclone dust collecting portion 53 having an inverted truncated cone shape stores the cyclone dust collecting portion 7 instead of the container 51. Although the accumulation chamber 14 is disposed inside the accumulation chamber 501 communicating with the cyclone dust collecting unit 53, the accumulation chamber 501 and the accumulation chamber 14 are not in direct communication.

  The inlet cylinder 56 of the cyclone dust collecting portion 53 into which intake air flows from the suction hose 4 (FIG. 1) is provided in the tangential direction on the upper peripheral surface of the cyclone dust collecting portion 53. The cyclone dust collecting portion 53 has a sealed structure except for the communicating portion of the inlet tube 56 and the inner tube 15.

  All of the intake air that has flowed into the cyclone dust collecting portion 53 passes through the filtration filter dust collecting portion 52 provided in the inlet cylinder 12 of the cyclone dust collecting portion 7. The filtration filter dust collecting part 52 is electrically connected to the dust collecting electrode of the cyclone dust collecting part 7.

  A filtration filter dust collecting portion 54 is provided in the exhaust path 9 to the outside of the main body 5.

  The intake air containing the dust first enters the cyclone dust collecting section 53, and large dust is removed by the cyclone function of the cyclone dust collecting section 53 and the filtration filter dust collecting section 52. The removed dust is held in the cyclone dust collecting unit 53 as it is.

  The intake air from which the large dust has been removed then flows into the cyclone dust collecting section 7 and is sucked into the electric blower section 8 after the small dust has been removed.

  Thereafter, the intake air sucked into the electric blower unit 8 is sent to the exhaust path 9 and passes through the filtration filter dust collecting unit 54 which is a fine filtration filter. In the fourth embodiment, the amount of dust collected by the cyclone dust collecting unit 7 is significantly reduced compared to the case where the dust collecting unit upstream of the filter does not have a function of collecting small dust. Even with a fine filter, clogging hardly occurs. After passing through the filtration filter dust collecting portion 54, air with very little dust is discharged from the main body 5.

In the fourth embodiment, as compared with the third embodiment, large dust is collected mainly by the cyclone dust collecting function of the cyclone dust collecting section 53. Since a rough thing can be used, it becomes advantageous in terms of the pressure loss of intake air. Thereby, the power consumption of the motor 11 and the burden of heat generation are reduced. Moreover, the shape of the whole vacuum cleaner can be made smaller than separately disposing another cyclone dust collecting part in front of the cyclone dust collecting part 7 so that large dust does not flow into the cyclone dust collecting part 7. The other configurations and operations of the fourth embodiment of the vacuum cleaner according to the present invention are the same as the configurations and operations of the third embodiment of the vacuum cleaner according to the present invention described above. The description is omitted.
(Embodiment 5)
FIG. 7 is a schematic diagram for explaining an internal configuration of the main body 5 in Embodiment 5 of the electric vacuum cleaner according to the present invention.

  The main body 5 includes a cyclone dust collecting section 7, an electric blower section 8, an exhaust path 9 from the electric blower section 8 to the outside of the main body 5, and paths that connect the respective sections.

  The cyclone dust collecting unit 7 includes an inflow path 101 that is a suction path, an outer cylinder 102, an accumulation chamber 103 and an inner cylinder 104, a linear discharge electrode 105 a in the inflow path 101, and an electrode holding unit 106 that holds the discharge electrode 105 a. , A cyclone center discharge wire 105b and a high voltage generation circuit 107 are provided. The discharge electrode 105 a is stretched in the inflow direction in the inflow path 101 and is held by the electrode holding unit 106.

  The upper part of the outer cylinder 102 has a cylindrical shape with an upper bottom, in which the inflow path 101 is connected in a tangential direction, and the lower part has an inverted truncated cone shape. A bottomed cylindrical accumulation chamber 103 that opens to the outer cylinder 102 is provided below the outer cylinder 102, and an opening in the outer cylinder 102 extends above the center of the outer cylinder 102 from the upper bottom. The inner cylinder 104 is penetrated, and a cyclone center discharge wire 105b is stretched at the center from the lowermost part of the outer cylinder 102 to the upper end of the inner cylinder 104. A high voltage is applied to the cyclone center discharge wire 105 b by the high voltage generation circuit 107.

  An upper end portion of the inner cylinder 104 is connected to the electric blower unit 8 through a suction path.

  The inflow path 101, the outer cylinder 102, the accumulation chamber 103, and the inner cylinder 104 are made of PET (polyethylene terephthalate) which is an insulating material. The inner wall of the inverted frustoconical portion of the outer cylinder 13 is made of an aluminum material that is grounded. A part of the inner wall of the inflow path 101 and the inner wall of the side surface of the inner cylinder 104 are also made of an aluminum material that is grounded.

  The discharge electrode 105a and the cyclone center discharge wire 105b are tungsten wires having a diameter of 0.2 mm and cannot be held by themselves, so that they are held under tension by the electrode holding unit 106 formed of PET.

  The intake air including the dust that has flowed into the cyclone dust collecting portion 7 passes through the inflow path 101 and flows into the outer cylinder 102. The intake air that flows into the outer cylinder 102 becomes a swirling airflow because the outer cylinder 102 has a cylindrical shape, and forms a forced vortex area near the central axis of the outer cylinder 102 and a quasi-free vortex area on the outer periphery thereof. It flows downward due to the outer cylinder path structure and gravity.

  At this time, since the centrifugal force expressed by the formula (1) acts on the dust, the dust of 3 μm (preferably 1 μm) or more is pressed against the inner wall of the outer cylinder 102 and separated from the intake air, and is generated in the descending airflow. Along the collecting chamber 103. Thereafter, the airflow turns upward, flows through the inner cylinder 104 and the suction path, and is sucked into the electric blower 8.

  Although the main flow of the intake air is as described above, a large amount of secondary flow and turbulence are generated particularly in the vicinity of the inlet of the outer cylinder 102 and in the accumulation chamber 103, and most of these are due to centrifugal force action. This will cause a reduction in the collection capacity and cause dust to re-scatter.

  The operation of the cyclone dust collecting unit 7 described above is a collecting operation using centrifugal force acting on dust, but in parallel with this, in the cyclone dust collecting unit 7, the Coulomb force acting on dust is utilized. A collection operation is also performed. Below, the collection operation | movement using this Coulomb force is demonstrated.

  In the high voltage generation circuit 107, a voltage obtained from a commercial AC power source is boosted by a transformer, and further boosted by a voltage doubler rectifier circuit in which a diode and a capacitor are stacked in series, thereby generating a positive DC voltage of 6 kV. . When this +6 kV voltage is applied to the discharge electrode 105a and the center discharge wire 105b, the flow rate is about 0.04 mA between the inflow path 101, the aluminum collecting dust electrodes on the inner walls of the outer cylinder 102 and the inner cylinder 104. Current flows, so-called corona discharge occurs.

  At this time, the holes generated in the ionization region due to the strong electric field in the vicinity of each of the discharge electrode 105a and the center discharge wire 105b positively ionize the particles in the intake and adhere to the dust, or dust in the ionization region. Is directly ionized, so that the Coulomb force is generated and collected in the dust with the dust collecting electrode.

  If a negative voltage is generated by the high voltage generating circuit, a large amount of negative ions are generated, and ozone is generated by this action. If this ozone rises to a certain concentration and is discharged outside the vacuum cleaner, the user feels a strange odor, so some preventive means is required. In order to avoid this, in the fifth embodiment, a positive voltage is applied to the discharge electrode 105a and the center discharge wire 105b.

  As explained above, the dust collecting principle by centrifugal force action and the dust collecting principle by Coulomb force action are completely different, so when acting simultaneously (in parallel), the centrifugal force The coulomb force can be added together, and the collection rate can be improved compared to the case where each of them is operated alone, and the collection of fine particles is possible.

  Furthermore, the operation | movement in this Embodiment 5 of the vacuum cleaner which concerns on this invention is demonstrated concretely.

  The dust in the intake air flowing into the inflow path 101 is charged by corona discharge by the discharge electrode 105a. Here, in a general household vacuum cleaner, the flow velocity of air in the inflow path 101 is fast to some extent (for example, 25 m / second or more), so that some dust is attracted to the dust collecting electrode on the inner wall of the inflow path 101. In addition, it passes through the region of the dust collecting electrode, and the collection rate is not so high.

  However, in the outer cylinder 102, dust of 3 μm (preferably 1 μm) or more is also collected due to a synergistic effect of the Coulomb force acting between the dust collecting electrodes on the inner wall and the centrifugal force caused by the swirling airflow. Further, the dust screened into the accumulation chamber 103 along the swirling airflow accumulates in the accumulation chamber 103, while the airflow rises toward the inner cylinder 104.

  Thereafter, dust is charged again or newly by corona discharge by the center discharge wire 105 b and collected by the dust collection electrode of the inner cylinder 104. At this time, in particular, since the Coulomb repulsive force is generated between the charged dust and the central discharge wire 105b, the dust that has not been collected so far while being charged by the discharge electrode 105a is also collected. It is easy to collect by the Coulomb force between the dust collecting electrodes. In addition, when secondary flow and turbulent flow are generated in each part, the flow velocity of these air is almost slower than that when flowing into the inflow path 101. Easily collected by Coulomb force.

  As described above, in the fifth embodiment of the vacuum cleaner according to the present invention, a plurality of discharge electrodes are provided, and the first stage plays a main role of dust charging, and is collected by the dust collection electrodes after the subsequent stage. As a result, the dust collection rate can be increased even when the flow rate of the intake air is high.

Further, in the outer cylinder 102, since the dust distribution varies due to centrifugal force, it is possible to increase the charging efficiency by arranging the first-stage discharge electrode 105a in a portion with high density. It varies depending on dust accumulation. If the first-stage discharge electrode 105a is arranged in the inflow path 101 as in the fifth embodiment, the dust can be stably charged in the substantially constant inflow air. Other configurations and operations of the vacuum cleaner according to the fifth embodiment of the present invention are the same as those of the first embodiment of the vacuum cleaner according to the present invention described above. The description is omitted.
(Embodiment 6)
FIG. 8 is a schematic diagram for explaining the cyclone dust collecting section 7 in Embodiment 6 of the electric vacuum cleaner according to the present invention.

  In the cyclone dust collecting portion 7, the inflow path 101 is formed along the outer periphery of the outer cylinder 102, the discharge electrode 105 c in the inflow path 101 has a needle shape made of stainless steel, and penetrates the upper surface of the inflow path 101. The second embodiment is different from the fifth embodiment in that the tip of the discharge electrode 105c is arranged so as to be the center of the cross section of the inflow path 101.

  The dust collection electrode for the discharge electrode 105c is formed of an aluminum material on the inner wall of the side surface and the lower surface of the inflow path 101, and is grounded. When a DC voltage of +6 kV is applied to the discharge electrode 105c, the electric field strength increases only at the tip of the needle, and an ionization region is generated only in the vicinity of the needle to charge the dust. The charged dust can be collected by both centrifugal force and Coulomb force as in the fifth embodiment.

In the sixth embodiment, as described above, by setting the discharge electrode 105c of the first stage (inflow path 101) to a needle shape, the amount of charge to dust is generally smaller than in the case of a linear shape. However, since the shape can be held by the discharge electrode 105c alone, there is no need for a holding member that increases the cost and complexity of the components, and it is possible to provide sufficient strength against vibration and large dust collisions. The other configurations and operations of the vacuum cleaner according to the sixth embodiment of the present invention are the same as the configurations and operations of the above-described vacuum cleaner according to the fifth embodiment of the present invention. The description is omitted.
(Embodiment 7)
FIG. 9 is a schematic diagram for explaining the cyclone dust collecting section 7 in Embodiment 7 of the electric vacuum cleaner according to the present invention.

  In the cyclone dust collecting portion 7, the inner wall of the inverted frustoconical portion of the outer cylinder 102, a part of the inner wall of the inflow path 101, and the inner wall of the side surface of the inner cylinder 104 are formed of grounded aluminum material. However, in addition to this, the inner wall of the accumulation chamber 103 is also formed of an aluminum material that is grounded.

  Normally, since the flow rate of the exhaust air from the accumulation chamber 103 is small as indicated by the broken line arrow in FIG. If this is done, the dust once separated and deposited in the accumulation chamber 103 hardly rescatters. However, home vacuum cleaners that require space saving cannot take sufficient measures as described above.

  On the other hand, if the inner wall of the accumulation chamber 103 is also a dust collecting electrode as in the seventh embodiment, the action of retaining the dust inside the accumulation chamber 103 by Coulomb force occurs, and the possibility of re-scattering is reduced. I can do it. The other configurations and operations of the seventh embodiment of the vacuum cleaner according to the present invention are the same as the configurations and operations of the fifth embodiment of the vacuum cleaner according to the present invention described above. The description is omitted.

  The present invention is not limited to Embodiments 5 to 7 described above. For example, although the dust collecting electrode is formed on the inner wall surface of the constituent member of the suction path, it can be formed in the suction path in a mesh shape. Further, the discharge electrode may be arranged in the accumulation chamber in order to enhance the effect of retaining dust in the accumulation chamber and to add effects such as sterilization and deodorization.

DESCRIPTION OF SYMBOLS 1 Suction port 2 Suction pipe 3 Connection pipe 4 Suction hose 5 (Electric vacuum cleaner) main body 6 Paper bag (Filtration filter dust collection part, 1st dust collection means)
7, 18, 53 Cyclone dust collecting unit 8 Electric blower unit 9 Exhaust path 10 Fan 12, 55, 56 Inlet tube 13, 102 Outer tube 14, 20, 31, 103, 501 Accumulation chamber 15, 104 Inner tube 16, 105b Cyclone Center discharge wire 17, 107 High voltage generation circuit 19, 30, 52, 54 Filtration filter dust collecting part 51 Container 101 Inflow path 105a, 105c Discharge electrode 106 Electrode holding part

Claims (5)

A suction port for sucking dust, an electric blower that generates intake air, a suction path that communicates from the suction port to the electric blower, an exhaust path from the electric blower to the outside, and the suction path are provided in the suction path. In a vacuum cleaner comprising a first dust collecting means and a second dust collecting means for collecting,
The first dust collecting means is a first cyclone dust collecting part by centrifugal force action,
The second dust collecting means is a second cyclone dust collecting part by centrifugal force action,
The first cyclone dust collecting part also serves as a container for storing the second cyclone dust collecting part, and the container is provided with a first inlet tube through which intake air flows tangentially from the suction port to the upper peripheral surface of the container,
The second cyclone dust collecting portion has an outer cylinder, and a second inlet cylinder for inflowing air in a tangential direction is provided at an upper portion of the outer cylinder,
An electric vacuum cleaner comprising an inner cylinder in which one end opened to the outer cylinder penetrates and the other end communicates with a suction path of the electric blower.   The electric vacuum cleaner according to claim 1, wherein the second inlet tube is provided with a filter for filtering dust.   The vacuum cleaner according to claim 1 or 2, wherein an accumulation chamber for collecting the collected dust is individually provided below the first and second cyclone dust collection units.   The electric vacuum cleaner according to any one of claims 1 to 3, wherein the second cyclone dust collecting part is provided with an electric dust collecting means by a Coulomb force.   The electrostatic dust collecting means is provided with a discharge electrode for corona discharge in intake air, and a part of the suction path of the two-cyclone dust collecting part is grounded or a voltage having a polarity opposite to that of the discharge electrode is applied. The vacuum cleaner according to claim 4.