Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
  • A47L9/2857—User input or output elements for control, e.g. buttons, switches or displays
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
  • A47L9/2805—Parameters or conditions being sensed
  • A47L9/281—Parameters or conditions being sensed the amount or condition of incoming dirt or dust
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
  • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
  • A47L9/2805—Parameters or conditions being sensed
  • A47L9/2821—Pressure, vacuum level or airflow

Definitions

• the present invention relates to an electric vacuum cleaner including a plurality of electric blowers.
• Such kinds of electric vacuum cleaners have conventionally included a vacuum cleaner main body with a plurality of electric blowers housed in parallel therein.
• a dust collecting chamber is provided with which suction sides of the electric blowers commonly communicate.
• a controlling portion as a controlling means for making the electric blowers independently drive is provided (see, for example, Patent Citation 1).
• Patent Citation 1 Japanese Laid-Open Patent Publication No. 2007-20765 Disclosure of Invention Technical Problem
• the present invention has been made in view of the above problem, and aims at providing an electric vacuum cleaner capable of securing the suction power even in the case where any one of the plurality of electric blowers is driven.
• An electric vacuum cleaner of the present invention includes: a vacuum cleaner main body with a plurality of electric blowers housed therein; a common dust collecting chamber which communicates with a suction side of each of the electric blowers; a controlling means capable of making the electric blowers independently drive; and backflow preventing means which are provided in accordance with the electric blowers and prevent air from flowing backward to the dust collecting chamber side.
• an electric vacuum cleaner of the present invention includes: a controlling means capable of performing control for driving only any one of the plurality of electric blowers and stopping the other electric blowers, and control for driving all of the plurality of the electric blowers; and backflow preventing means which are provided in accordance with the other electric blowers and prevent air from flowing backward to the dust collecting chamber side.
• an electric vacuum cleaner of the present invention includes a controlling means capable of, when driving one of the plurality of electric blowers, driving the other electric blowers so that no air flows backward to the dust collecting chamber side.
• backflow preventing means provided in accordance with the electric blowers prevent air from being sucked into a dust collecting chamber side from the other stationary electric blowers, and suction power can be secured.
• backflow preventing means provided in accordance with the other electric blowers prevent air from being sucked into the dust collecting chamber side from the other stationary electric blowers, and the suction power can be secured.
• FIG. 1 is an explanatory plan view showing an electric vacuum cleaner of a first embodiment of the present invention in which only one of electric blowers is driven.
• FIG. 2 is an explanatory plan view showing the electric vacuum cleaner in which only the other electric blower is driven.
• FIG. 3 is an explanatory plan view showing the electric vacuum cleaner in which all the electric blowers are driven.
• FIG. 4(a) is a vertical cross sectional view showing a backflow preventing means of the electric vacuum cleaner.
• Fig. 4(b) is an enlarged vertical cross sectional view showing a part of the backflow preventing means.
• FIG. 5 is a perspective view of the backflow preventing means
• Fig. 6 is a perspective view of the electric vacuum cleaner.
• FIG.7]Fig. 7 is an explanatory plan view showing an electric vacuum cleaner of a second embodiment of the present invention in which only one of the electric blowers is driven.
• FIG. 8 is an explanatory plan view showing the electric vacuum cleaner in which only the other electric blower is driven.
• Fig. 9 is an explanatory plan view showing the electric vacuum cleaner in which all the electric blowers are driven.
• FIG. 10 is an explanatory plan view showing an electric vacuum cleaner of a third embodiment of the present invention in which only one of the electric blowers is driven.
• FIG. 11 is an explanatory plan view showing the electric vacuum cleaner in which all the electric blowers are driven.
• Fig. 12 is an explanatory plan view showing an electric vacuum cleaner of a fourth embodiment of the present invention in which only one of the electric blowers is driven.
• FIG. 13 is an explanatory plan view showing the electric vacuum cleaner in which all the electric blowers are driven.
• FIG. 14 is an explanatory plan view showing an electric vacuum cleaner of a fifth embodiment of the present invention in which one of the electric blowers is driven and the other electric blower is subjected to backflow-preventing-driving.
• FIG. 15 is an explanatory plan view showing the electric vacuum cleaner in which one of the electric blowers is subjected to the backflow-preventing-driving and the other electric blower is driven.
• Fig. 16 is an explanatory plan view showing the electric vacuum cleaner in which all the electric blowers are driven. Explanation of Reference [0012] 1 Vacuum cleaner main body
• the reference symbol 1 denotes a vacuum cleaner main body
• the vacuum cleaner main body 1 includes a hollow main body case 2.
• the inside of the main body case 2 is partitioned, by a partitioning wall 8, into a dust collecting chamber 4 which is located at the front end of the inside and to/from which a dust collecting pack 3 as a filter is attached/detached, electric blowers 5A, 5B located at the rear side thereof (hereinafter, at least either of the electric blowers 5 A, 5B, or as a whole, will be sometimes simply referred to as an electric blower 5) and an electric blower chamber 7 with a controlling means 6 and a cord reel (not shown) housed therein.
• a main body suction port 11 communicating with the dust collecting chamber 4 is opened in the front of the main body case 2, and a hose body 12 as a slender and approximately cylindrical connection tube capable of bending is communication-connected with the main body suction port 11.
• a hand operating part 13 for selecting an operation mode of the electric blower 5 is provided at the top end of the hose body 12, a plurality of setting buttons 14 each for setting a driving state, operation mode, of the electric blower 5 and the like to a predetermined state are provided on the hand operating part 13, and a gripping part 15 to be gripped by a worker in cleaning is protruded on a base end side of the hand operating part 13.
• a slender and approximately cylindrical extension tube 16 capable of telescoping is attachably/detachably communication-connected with the top end of the hand operating part 13.
• a floor brush 17 as a suction port body which is put on, for example, a carpet to be cleaned on a floor surface and sucks dust on the carpet, is attachably/detachably communication-connected with the top end of the extension tube 16.
• the main body case 2 includes: a lower case 21 with a partitioning wall 8 and an opened upper side; a lid body 22 for opening and closing an upper portion of the dust collecting chamber 4 located at the front side of the lower case 21; and an upper case 23 for closing an upper portion of the electric blower chamber 7 located at the rear side of the lower case 21. Additionally, many exhaust holes 24 are bored in the main body case 2.
• Traveling wheels 25 having a large diameter for traveling the vacuum cleaner main body 1 on the floor surface are rotatably and pivotally supported on both sides of the electric blower chamber 7 located at the rear side of the lower case 21, and a turn wheel (not shown) as a driven wheel is turnably provided on a bottom, which faces the floor surface, of the dust collecting chamber 4 located at the front side of the lower case 21.
• the dust collecting pack 3 is, for example, a disposable paper pack, and includes a mouth frame (not shown) to be fixed to the dust collecting chamber 4 and a pack body 28 in the form of pouch attached to the mouth frame.
• the dust collecting chamber 4 is formed commonly to the electric blowers 5 A, 5B.
• the electric blower 5 includes a centrifugal fan 31 and a motor 32 for rotating the centrifugal fan 31, and the centrifugal fan 31 and the motor 32 are housed in a cylindrical body case 33. Additionally, the electric blowers 5A, 5B have centrifugal fans 31 on the front side and motors 32 on the rear side respectively, and juxtaposed in the electric blower chamber 7 in its width direction.
• the motor 32 is driven by electric power fed from the outside.
• the cylindrical body case 33 includes an approximately cylindrical case main body 33a having a closed rear side and an opened front side, and a fan cover 33b engaged with the end of the opened front side of the case main body 33a.
• the motor 32 is housed in the case main body 33a, and the centrifugal fan 31 is housed in the fan cover 33b.
• a plurality of quadrangular exhaust ports 33c communicating with the electric blower chamber 7 are opened in the case main body 33 a, and a circlular suction port 33d communicating with the dust collecting chamber 4 is opened at the center of the front end of the fan cover 33b.
• the rear end of the case main body 33a is elastically supported on the main body case 2 (lower case 21) by a rear portion supporting rubber (not shown) as an elastic supporting member
• a circumferential edge of the fan cover 33b is elastically supported on the main body case 2 (lower case 21) by an annular front portion supporting rubber 36 which is a sealing member as an elastic supporting member
• the suction port 33d is airtightly connected to the dust collecting chamber 4 via the partitioning wall 8 so as not to communicate with the electric blower chamber 7.
• the controlling means 6 is a circuit board including a switching element such as a triac, and the like, and can make the electric blowers 5A, 5B independently drive by phase angle control in accordance with an operation mode input with the setting button 14. For example, in an operation mode, such as a weak mode, for applying relatively small suction power (operation mode for applying suction power half or less of full power), the controlling means 6 drives either of the electric blowers 5A, 5B and stops the other, and in an operation mode, such as a strong mode, for applying relatively large suction power (operation mode for applying suction power half or more of full power), the controlling means 6 drives both the electric blowers 5 A, 5B.
• a switching element such as a triac, and the like
• a power cord (not shown) having a plug portion at its top end is wound around the cord reel so as to be freely pulled out.
• the electric blower chamber 7 is formed commonly to the electric blowers 5A, 5B and communicates with the outside of the main body case 2 via the exhaust holes 24.
• Round communication holes 41A, 41B making the dust collecting chamber 4 and the electric blower chamber 7 communicate with each other and each having a large diameter are opened in the partitioning wall 8 at positions facing the front sides of the electric blowers 5A, 5B respectively.
• Filters 42A, 42B are attached to the upstream sides, front portions, of the communication holes 41A, 41B respectively, and check valve units 43 A, 43B are attached to the rear portions of the communication holes 4 IA, 4 IB respectively, the valve unit being an opening-closing means as a backflow preventing means.
• the communication holes 4 IA, 4 IB, or as a whole will be sometimes simply referred to as a communication hole 41
• at least either of the filters 42A, 42B, or as a whole will be sometimes simply referred to as a filter 42
• at least either of the check valve units 43 A, 43B, or as a whole will be sometimes simply referred to as a check valve unit 43.
• the filter 42 collects dust which cannot be collected by the dust collecting pack 3.
• a plurality of opening-closing valve bodies 46 are rotatably attached to a frame 45.
• the frame 45 includes, integrally in an axis direction, front and rear direction, a cylindrical frame 48 as a cylindrical first frame located at the upstream side and an angular tube-shaped frame 49 as an angular tube-shaped second frame located at the downstream side.
• the cylindrical frame 48 is airtightly connected to the downstream side of the communication hole 41.
• the angular tube-shaped frame 49 communicates with the downstream side of the cylindrical frame 48, faces the suction port 33d of the electric blower 5, is to be airtightly connected to the suction ports 33d, and includes upper wall 49a and lower wall 49b for vertically partitioning the inside of the main body case 2, and side walls 49c, 49c continuing to the upper wall 49a and lower wall 49b and for horizontally partitioning the inside.
• Round holes 51 each for pivotally supporting the opening-closing valve body 46 rotatably are bored in the side walls 49c, 49c.
• the holes 51 are vertically arranged approximately in a straight line.
• Each opening-closing valve body 46 is a flap portion formed of a relatively light member such as synthetic resin and in a laterally-long and quadrilateral plate shape, and the upper portions of both sides thereof are respectively inserted into the hole 51 so that the valve body 46 is pivotally supported so as to be rotatable in the front and rear direction (vertical direction). Further, the opening-closing valve bodies 46 are successively arranged vertically at an approximate interval, and the vertical size thereof is set so as to be larger than an interval between the holes 51, 51. Accordingly, a lower end 46a of the upper opening-closing valve body 46 can come into contact with a rear portion on the upper end side of the lower opening-closing valve body 46.
• each opening-closing valve body 46 rotates backward and upward so as to be approximately horizontal by negative pressure of the corresponding driving electric blower 5, and opens the angular tube- shaped frame 49.
• the lower end 46a side rotates forward and downward by its own weight and the valve body 46 closes.
• each opening-closing valve body 46 can be opened and closed by a pressure difference (wind power) between the upstream side and downstream side.
• the gripping part 15 of the hand operating part 13 of the hose body 12 connected to the main body suction port 11 is gripped, and a predetermined setting button 14 is operated.
• a control circuit in the vacuum cleaner main body 1 drives the motor 32 and rotates the centrifugal fans 31 so that the negative pressure is generated.
• the floor brush 17 connected to the top end side of the hose body 12 via the extension tube 16 is moved backward and forward on the floor surface with the gripping part 15.
• the controlling means 6 drives either of the electric blowers 5A or 5B in a predetermined order.
• the controlling means 6 drives not the electric blower 5 first driven in the preceding drive but the other electric blower 5. That is, in the case where the electric blower 5A is first driven in the preceding drive, the electric blower 5B is first driven in this drive, and in the case where the electric blower 5B is first driven in the preceding drive, the electric blower 5A is first driven in this drive. Moreover, in the case where both the electric blowers 5A, 5B are simultaneously driven in the preceding drive, whichever of the electric blowers 5A, 5B may be first driven.
• each opening-closing valve body 46 closed by rotation downward of the lower end 46a by its own weight is sucked to the upstream side
• the lower end 46a of each opening- closing valve body 46 is sucked to the upper end side of the underlying opening- closing valve body 46
• the lower end 46a of the lowest opening-closing valve body 46 is sucked to the step part 49d
• the inside of the frame 45 is closed, as indicated by the solid lines in Figs. 4(a) and 4(b)
• air is prevented from flowing backward from the exhaust port 33c to the suction port 33d of the electric blower 5B.
• each opening-closing valve body 46 since the pressure of the upstream side of each opening-closing valve body 46 is larger than that of the downstream side thereof in the check valve unit 43A, the lower end 46a of each opening-closing valve body 46 rotates backward and upward around the upper end side thereof until each opening-closing valve body 46 becomes approximately horizontal, the inside of the frame 45 is opened, and air is sucked into only the electric blower 5A from the main body suction port 11 side via the dust collecting chamber 4, as indicated by the imaginary lines in Figs. 4(a) and 4(b).
• each opening-closing valve body 46 closed by rotation downward by its own weight of the lower end 46a is sucked to the upstream side
• the lower end 46a of each opening- closing valve body 46 is sucked to the upper end side of the underlying opening- closing valve body 46
• the lower end 46a of the lowest opening-closing valve body 46 is sucked to the step part 49d
• the inside of the frame 45 is closed, as indicated by the solid lines in Figs. 4(a) and 4(b)
• air is prevented from flowing backward from the exhaust port 33c to suction port 33d of the electric blower 5A.
• each opening-closing valve body 46 since the pressure of the upstream side of each opening-closing valve body 46 is larger than that of the downstream side thereof in the check valve unit 43B, the lower end 46a of each opening-closing valve body 46 rotates backward and upward around the upper end side thereof until each opening-closing valve body 46 becomes approximately horizontal, the inside of the frame 45 is opened, and air is sucked into only the electric blower 5B from the main body suction port 11 side via the dust collecting chamber 4, as indicated by the imaginary lines in Figs. 4(a) and 4(b).
• the con- trolling means 6 drives both the electric blowers 5 A, 5B as shown in Fig. 3.
• each opening-closing valve body 46 since the pressure of the downstream side of each opening-closing valve body 46 becomes larger than that of the upstream side thereof in the check valve units 43 A, 43B, the lower end 46a of each opening-closing valve body 46 rotates backward and upward around the upper end side thereof until each opening-closing valve body 46 becomes approximately horizontal, the inside of the frame 45 is opened, and air is sucked into the electric blowers 5A, 5B from the main body suction port 11 side via the dust collecting chamber 4, as indicated by the imaginary lines in Figs. 4(a) and 4(b).
• the check valve unit 43B or 43A as a backflow preventing means, the units 43A, 43B being provided on the electric blowers 5A, 5B respectively, prevents air from being sucked into the dust collecting chamber 4 side from the other stationary electric blower 5, electric blower 5B or 5 A, the negative pressure of the electric blower 5 can be completely applied to the floor brush 17 side from the main body suction port 11, and thus suction power can be secured.
• the check valve unit 43 which is an opening-closing means, is adopted as a backflow preventing means, the backflow preventing means can be easily realized.
• the check valve unit 43 is opened and closed by the pressure difference between the upstream side and downstream side, no power source, such as a motor, for opening and closing the check valve unit 43 is required to be provided separately, the structure of the electric vacuum cleaner can be simplified, costs are reduced, and power can be saved.
• the check valve unit 43 since the check valve unit 43 includes the flap-shaped opening-closing valve body 46, which rotates downward by its own weight by stopping of the electric blower 5 and closes, the check valve unit 43 can be easily realized.
• the check valve unit 43 can be easily built in the vacuum cleaner main body 1 since the frame 45 and each opening-closing valve body 46 are integrally made as a unit.
• the electric blowers 5A, 5B are driven at a predetermined order, for example alternately, for each start of the electric vacuum cleaner, and thus the lives of the electric blowers 5A, 5B can be made approximately twice.
• the suction power can be improved compared with the case where one electric blower is used, and efficiency is improved compared with the case where the same suction power is obtained by one electric blower.
• the electric blower chamber 7 is partitioned into electric blower chambers 7A, 7B corresponding to the electric blowers 5A, 5B respectively, and the check valve units 43A, 43B are attached to the upstream sides of the electric blower chambers 7A, 7B respectively in the first embodiment.
• a partitioning wall 55 is formed on the partitioning wall 8 so as to continue approximately straight from the rear portion of the partitioning wall 8 to the rear portion of the main body case 2, and the electric blower chamber 7 is partitioned into the electric blower chambers 7A, 7B by the partitioning wall 55.
• the electric blower chambers 7A, 7B communicate with the exhaust sides (downstream sides) of the electric blowers 5A, 5B via the exhaust ports 33c respectively.
• the controlling means 6 drives the electric blower 5 A as shown in Fig. 7, or drives the electric blower 5B as shown in Fig. 8, and thus the pressure of the downstream side becomes larger than that of the upstream side in the check valve unit 43B or 43A, each opening-closing valve body 46 rotates downward to close, and air is prevented from flowing backward from the electric blower 5B or 5A and sucked into only the electric blower 5A or 5B from the main body suction port 11 side via the dust collecting chamber 4.
• the controlling means 6 drives both the electric blowers 5A, 5B as shown in Fig. 9, and thus the pressure of the upstream side becomes larger than that of the downstream side in the check valve units 43A, 43B, each opening-closing valve body 46 opens, and air is sucked into the electric blowers 5A, 5B from the main body suction port 11 side via the dust collecting chamber 4.
• the controlling means 6 can perform control for driving either of the electric blowers 5 and stopping the other electric blower 5, and control for driving all the electric blowers 5 in the first embodiment.
• the con- trolling means 6 drive-controls the electric blowers 5 so that either of the electric blowers 5 is driven prior to the other electric blower 5.
• the check valve unit 43 is arranged in accordance with the other electric blower 5.
• the controlling means 6, for example in the case where the electric blower 5A is constantly driven and shifting to the operation mode for applying relatively large suction power is made in cleaning, can properly drive the electric blower 5B additionally as necessary, and a check valve unit 43C, which is an opening- closing means as a backflow preventing means, is arranged in accordance with only the electric blower 5B. In other words, driving order is set to the electric blower 5.
• check valve unit 43C is similar in constitution to the check valve unit 43 of the first embodiment.
• the controlling means 6 drives the electric blower 5A, and thus the pressure of the downstream side becomes larger than that of the upstream side in the check valve unit 43C, each opening-closing valve body 46 rotates downward to close, and air is prevented from flowing backward from the electric blower 5B and sucked into only the electric blower 5A from the main body suction port 11 side via the dust collecting chamber 4.
• the controlling means 6 drives both the electric blowers 5 A, 5B as shown in Fig.
• each opening-closing valve body 46 opens, and air is sucked into the electric blowers 5A, 5B from the main body suction port 11 side via the dust collecting chamber 4.
• the check valve unit 43C provided in accordance with the other electric blower 5 (electric blower 5B) prevents air from being sucked into the dust collecting chamber 4 side from the other stopping electric blower 5 (electric blower 5B), the negative pressure of the electric blower 5 is completely applied to the floor brush 17 side from the main body suction port 11, the suction power can be secured, for example, and the operation-effect similar to that of the first embodiment can be obtained.
• the controlling means 6 can perform control for driving either of the electric blowers 5 and stopping the other electric blower 5, and the check valve unit 43 is arranged in accordance with the downstream side of the other electric blower 5, in the second and third embodiments.
• the controlling means 6 drives the electric blower 5 A prior to the electric blower 5B, and the check valve unit 43C is arranged on the downstream side of the electric blower 5B of the electric blower chamber 7B corresponding to the electric blower 5B.
• the controlling means 6, for example, in the case of constantly driving the electric blower 5A and shifting to the operation mode for applying relatively large suction power in cleaning, can properly drive the electric blower 5B additionally as necessary.
• the controlling means 6 drives the electric blower 5A as shown in Fig. 12, and thus the pressure of the downstream side becomes larger than that of the upstream side in the check valve unit 43C, each opening-closing valve body 46 rotates downward to close, and air is prevented from flowing backward from the electric blower 5B and sucked into only the electric blower 5A from the main body suction port 11 side via the dust collecting chamber 4.
• the controlling means 6 drives both the electric blowers 5 A, 5B as shown in Fig.
• each opening-closing valve body 46 opens, and air is sucked into the electric blowers 5A, 5B from the main body suction port 11 side via the dust collecting chamber 4.
• the two electric blowers 5 are used in the third and fourth embodiments, three or more electric blowers 5 can be similarly used.
• control can be performed that one of the electric blowers 5 is constantly driven and the other plurality of electric blowers 5 are stopped, or that the plurality of electric blowers 5 are constantly driven and the other electric blowers 5 are stopped.
• backflow preventing means can be provided in accordance with the other plurality of electric blowers 5 respectively.
• one backflow preventing means can be provided for a group of the electric blowers 5.
• the controlling means 6 drives, in driving any of the electric blowers 5, the other electric blower 5 so that air is prevented from flowing backward.
• the controlling means 6, as shown in Figs. 14 or 15, drives the electric blower 5B (electric blower 5A) at a low speed so that air is prevented from flowing backward to the dust collecting chamber 4 side via the electric blower 5B (electric blower 5A).
• the controlling means 6 detects the pressure in the electric blower chamber 7 by a blower chamber inner pressure detecting means (not shown) provided in the electric blower chamber 7, detects the pressure in the dust collecting chamber 4 by a dust collecting chamber inner pressure detecting means (not shown) provided in the dust collecting chamber 4, and drives, in driving either of the electric blowers 5 (electric blower 5A or 5B), the other electric blower 5 (electric blower 5B or 5A) so that a difference between the detected pressures in the dust collecting chamber 4 and electric blower chamber 7 is controlled.
• air is sucked into the electric blower 5 A or 5B from the main body suction port 11.
• the controlling means 6, as shown in Fig. 16 drives both the electric blowers 5 A, 5B so that air is sucked into the electric blowers 5 A, 5B from the main body suction port 11.
• the controlling means 6 drives the other electric blower 5 so that air is prevented from flowing backward, and thus the air is prevented from being sucked into the dust collecting chamber 4 side and the negative pressure of the electric blower 5 is completely applied to the floor brush 17 side from the main body suction port 11. Therefore, an operation-effect, such as securing of the suction power, similar to that of each of the above embodiments can be obtained.
• the controlling means 6 is adapted to be capable of driving any of the electric blower 5 constantly and stopping the other electric blower 5 in cleaning in the fifth embodiment similar to the third embodiment or fourth embodiment, not only can the same operation-effect be obtained but also a controlling method of the controlling means 6 can be simplified in constitution.
• a sealing member which, when the opening- closing valve bodies 46 are closed, comes into airtight contact with the upstream sides of the closed opening-closing valve bodies 46 may be provided in the angular tube- shaped frame 49.
• the present invention is used for, for example, household electric vacuum cleaners.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Filters For Electric Vacuum Cleaners (AREA)
• Electric Suction Cleaners (AREA)
• Electric Vacuum Cleaner (AREA)

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Publications (3)

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Citations (5)

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• 2007
  • 2007-11-26 JP JP2007305097A patent/JP5112022B2/ja not_active Expired - Fee Related
• 2008
  • 2008-11-21 WO PCT/JP2008/003438 patent/WO2009069274A1/en active Application Filing
  • 2008-11-21 CN CN2008801115556A patent/CN101820806B/zh not_active Expired - Fee Related
  • 2008-11-21 KR KR1020107009081A patent/KR101165898B1/ko active IP Right Grant
  • 2008-11-21 EP EP08855539.6A patent/EP2211678B1/de not_active Not-in-force
  • 2008-11-21 RU RU2010110351/12A patent/RU2424758C1/ru not_active IP Right Cessation
  • 2008-11-21 KR KR1020117027956A patent/KR101216909B1/ko not_active IP Right Cessation
• 2010
  • 2010-05-19 EG EG2010050821A patent/EG25887A/xx active

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