JP2009225993A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner separating dust collected on the surface of a dust collection chamber in a filter, with a simple structure. <P>SOLUTION: The vacuum cleaner includes in casings: the dust collection chamber R1 for storing dust sucked by a dust collecting section 5; a decompression chamber R2 partitioned from the dust collection chamber R1 with the use of a plurality of filters 9 and a partitioning wall 8; a decompressing section 3F for keeping the decompression chamber R2 at a low pressure state; piping section 11 and 13 arranged inside the decompression chamber R2 to allow the respective filters 9 to communicate with an external air communication hole 2H arranged in the casing; and a rotationally driving mechanism M for successively changing-over the filters 9 in a communication state with the piping section 11 and 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a dust collection chamber for storing dust sucked in by dust collection means, a decompression chamber partitioned from the dust collection chamber by a plurality of filters and partition walls, and air in the decompression chamber. The present invention relates to a vacuum cleaner provided with decompression means for discharging to the outside of a casing and maintaining the decompression chamber at a low pressure.

  There exists patent document 1 shown below as prior art document information relevant to this kind of vacuum cleaner. The suction type vacuum cleaner described in this Patent Document 1 collects dust in the air on the surface of the filter by supplying the air introduced into the dust collection chamber by suction to the decompression chamber via the filter. Can accumulate in the dust collection chamber. Further, when necessary, the dust collected on the surface of the filter on the dust collection chamber side can be released by the reverse airflow passing through the filter from the decompression chamber to the dust collection chamber. A reduction in suction force due to clogging can be suppressed.

JP-T-2007-512896 (paragraph number 0018, FIG. 3)

  However, in the suction type vacuum cleaner described in Patent Document 1, the filter is backwashed by changing the flow of the air flow generated by the blower in the reverse direction, so the blower and the filter are connected. It was necessary to provide a large number of valve means for reversing the air flow inside the conduit. For this reason, the structure of the suction type vacuum cleaner tends to be complicated, and the production cost tends to increase.

  Therefore, in view of the drawbacks of the suction vacuum cleaner according to the prior art exemplified above, the object of the present invention is to remove dust collected on the surface of the filter in the dust collection chamber with a simpler structure. The object is to provide a possible vacuum cleaner.

The first characteristic configuration of the suction type vacuum cleaner according to the present invention is:
Inside the casing, a dust collection chamber for storing dust sucked in by the dust collection means, a decompression chamber partitioned from the dust collection chamber by a plurality of filters and partition walls, and air in the decompression chamber to the outside of the casing Pressure reducing means for discharging and holding the pressure reducing chamber at a low pressure,
Piping means provided inside the decompression chamber to communicate each of the plurality of filters with an outside air communication hole provided in the casing, and a rotation drive mechanism for sequentially switching the filters in communication with the piping means. There is a point.

In the suction type vacuum cleaner according to the first characteristic configuration of the present invention, by creating a configuration in which the filter in communication with the piping means communicating with the outside air communication hole at one end is sequentially switched by the rotation drive mechanism, a large number of valves, etc. The suction type vacuum cleaner capable of sequentially removing the dust collected on the surface of the filter in the dust collecting chamber side can be obtained with a very simple structure that does not need to be used.
Furthermore, at the moment when the piping means is in communication with one filter, the remaining filter maintains a positive air flow from the normal dust collection chamber to the decompression chamber. The dust removal operation of the filter means can be performed while continuing. Note that when the anti-trap side of the filter means is opened to the atmosphere for dust removal from the filter means, the negative pressure level in the decompression chamber slightly decreases. The level drop is reduced and the suction operation is stabilized.

According to another characteristic configuration of the present invention, the piping means includes a first pipe that connects the branch portion provided in the center of the decompression chamber and the outside air communication hole, and an opening portion of the one filter and the branch portion. A second pipe communicating with the
One end of the second pipe on the branch part side is rotatably connected to the branch part, and the rotation driving mechanism is configured to rotate the second pipe.

  In this configuration, the plurality of filters, the partition walls, and the first pipe are fixed, and only the second pipe may be rotated along the openings of the plurality of filters by the rotation drive mechanism. It is easy to miniaturize the vacuum cleaner.

  Another feature of the present invention is that the other end of the second pipe on the filter side is slidable along the axis of the other end and urged toward the partition wall. The point is that the member is locked.

  With this configuration, the gap between the other end of the piping member and the partition wall is closed by always holding the other end of the second pipe pressed against the partition wall. The air that has entered through the outside air communication hole is more reliably supplied to the opening of the filter means, and the dust is effectively backwashed.

  Another feature of the present invention is that an annular groove for receiving an airflow is formed on the outer peripheral surface of the auxiliary hollow member.

  If it is this structure, the air which entered the sliding contact surface between a piping member and an auxiliary | assistant hollow member among the air which entered from the through-hole will pass through the sliding contact surface by the phenomenon of being confined by the (labyrinth-like) annular groove. Since the flow of air that enters and leaks into the decompression chamber is suppressed, the decompression state of the decompression chamber based on the dust removal mechanism is unlikely to decrease.

  Another characteristic configuration of the present invention is that an auxiliary rotation driving mechanism is provided that forcibly rotates the auxiliary hollow member with respect to the piping member based on the rotational force of the rotation driving mechanism.

  With this configuration, the auxiliary hollow member is forcibly rotated with respect to the piping member, so that the auxiliary hollow member is always maintained in a freely movable state without being caught with respect to the other end of the piping member. easy.

  Another characteristic configuration of the present invention is that an expanded communication chamber having an inner diameter exceeding the diameter of the opening of the filter is provided at the other end of the second pipe.

  With this configuration, it is possible to prolong the communication state (the length of time during which the communication state continues) between one filter means and the through-hole for opening to the atmosphere, so that it is possible to increase the dust removal capability for the filter means.

  Another feature of the present invention is that a flange-like cover having a width at least equal to the diameter of the opening of the filter is provided at the other end of the second pipe.

  In this configuration, the flange-shaped cover can prevent air leakage at an angular phase where the other end of the piping member partially overlaps the anti-trap side of the filter means. The phenomenon that decreases is difficult to occur.

The best mode for carrying out the present invention will be described below with reference to the drawings.
A suction type vacuum cleaner 40 shown in FIGS. 1 to 6 is detachably installed on a bottomed cylindrical first casing 1 having a plurality of casters 4 mounted on a floor, and an upper portion of the first casing 1. A bottomed cylindrical second casing 2 and a circular dome-shaped third casing 3 that is detachably installed on the top of the second casing 2 are provided. The first casing 1, the second casing 2, and the third casing 3 have a common axis X that extends vertically.

  As shown in FIGS. 1 and 2, the first casing 1 and the second casing 2 are detachably connected by a toggle latch type clamp D. Moreover, the 1st casing 1 and the 2nd casing 2 are hold | maintained airtight at the time of a connection by the rubber | gum and elastomer O-ring (refer FIG. 3) attached to the outer peripheral part lower end of the 1st casing 1. FIG. . The second casing 2 and the third casing 3 are also connected in the same manner.

  A through hole 1H is provided on a side surface of the lowermost first casing 1, and a boss portion 7 for attaching a flexible suction hose 5 is protruded from the through hole 1H. At the tip of the suction hose 5, a nozzle 6 (an example of dust collecting means) that is opened to slide on the floor or the like to suck in dust is attached. The inside of the first casing 1 constitutes a dust collection chamber R1 that collects the sucked dust. Incidentally, the inside of the second casing 2 constitutes a decompression chamber R2 that is brought into a vacuum state or a decompressed state by a fan unit 3F (an example of decompression means) provided in the third casing 3.

  On the bottom surface of the second casing 2, a flat partition wall 8 (an example of a partition wall) that separates the dust collection chamber R1 and the decompression chamber R2 from each other is provided. As shown in FIG. 4, a plurality (six in this case) of through-holes 8 </ b> H are arranged in the partition wall 8 at equal intervals along a virtual circle C centered on the axis X. A bottomed and generally cylindrical filter 9 is attached to the lower edge of each through-hole 8H so as to extend toward the lower dust collection chamber R1. The filter 9 includes a disk-like flange portion 9a formed at the open upper end, and a bottomed filter main body portion 9b extending downward from the flange portion 9a. The inner diameter of the through hole 8H formed in the partition wall 8 is substantially the same as the inner diameter of the filter main body 9b.

  As shown in FIG. 3 and FIG. 6, each filter 9 is fixed by an auxiliary disk 10 positioned below the partition wall 8 so as to be pressed against the lower edge of the through hole 8 </ b> H. For this purpose, the auxiliary disk 10 is formed with six through holes 10H having a smaller diameter than the flange portion 9a and a larger diameter than the filter main body portion 9b. The filter 9 is a resin filter having an infinite number of fine pores, and as shown in FIGS. 4 and 5, has a bowl-like cross-sectional shape to increase its apparent specific surface area.

  As shown in FIG. 3, the 3rd casing 3 is exhibiting the container shape which closes the upper end opening part 2a of the 2nd casing 2, the suction port 3a is formed in the lower surface, the discharge port 3b is formed in the side surface, Is provided with a blower-like fan unit 3F that sucks air in the decompression chamber R2 from the suction port 3a and discharges the air upward from the discharge port 3b. Since the decompression chamber R2 is in a vacuum state by the function of the fan unit 3F, a positive airflow is formed from the dust collection chamber R1 toward the decompression chamber R2 through the pores of the filter 9. Due to this air flow, dust is accumulated from the nozzle 6 through the suction hose 5 into the dust collecting chamber R1.

Dust larger than the pores of the filter 9 falls, but fine particles having a size close to the pores adhere (or adsorb) to the outer surface (trap surface) of the filter, causing clogging that reduces the suction force. .
The second casing 2 is provided with a dust removing mechanism 11 that separates the particles adhering to the outer surface of the filter 9 in this way by an air flow passing through the pores of the filter 9 in the direction opposite to the normal direction during suction.

The dust removing mechanism 11 is configured by means for releasing the anti-trap side of the filter 9 (the internal space of the filter 9 communicating with the back side of the trap surface) to the atmosphere.
More specifically, as shown in FIG. 3, the dust removing mechanism 11 includes an outside air communication hole 2H formed on the side wall of the second casing 2 so as to communicate with the atmosphere, and one end connected to the outside air communication hole 2H at one end. A flexible hose 13 (an example of a first pipe), a hollow rotating hollow body 20 (an example of a second pipe) that is rotatably supported around an axis X while maintaining a communication state with the flexible hose 13; A drive mechanism 21 that rotationally drives the rotary hollow body 20 is provided so that the six through holes 8H of the partition wall 8 are alternately communicated with the outside air communication holes 2H in order.
A cylindrical sleeve 12 is engaged with the outside air communication hole 2 </ b> H of the second casing 2, and the flexible hose 13 is externally connected to the sleeve 12.

  As shown in FIG. 6, the rotary hollow body 20 extends from the first vertical tube 16 (an example of the first hollow portion) extending along the axis X and radially outward from the first vertical tube 16. The horizontal tube 17 (an example of a second hollow portion) and a second vertical tube 18 (an example of a second hollow portion) extending downward from the tip of the horizontal tube 17 are provided. The second vertical pipe 18 has a closed upper end and a lower end opened as an airflow output portion 18a. The axis of the second vertical pipe 18 is drawn by the centers of the six through holes 8H through which the filter 9 is inserted. It coincides with the position of the virtual circle C. The flexible hose 13, the first vertical pipe 16, the horizontal pipe 17, and the second vertical pipe 18 are all provided as an example of a piping member that communicates with the outside air communication hole 2 </ b> H of the second casing 2.

  Near the upper end of the first vertical tube 16, a fixed vertical tube 15 (an example of a branching portion) communicating with the other end of the flexible hose 13 is supported so as to be relatively rotatable. An annular ventilation space S having a thickness of several millimeters is provided between the inner peripheral surface of the fixed vertical tube 15 and the outer peripheral surface of the first vertical tube 16, and at the same time, part of the side surface of the first vertical tube 16. A plurality of through-holes 16H (four in the illustrated example) are formed at regular intervals. Therefore, the inside of the flexible hose 13 and the inside of the first vertical pipe 16 are in air communication with each other through the through holes 16H and the annular ventilation space S.

An electric motor M constituting the drive mechanism 21 is supported by an angle 22 extending horizontally on the inner surface of the decompression chamber R2, and the upper end of the first vertical pipe 16 rotates relative to the rotation axis Ma of the electric motor M. Linked impossible.
The lower end of the first vertical pipe 16 is rotatably supported by a boss portion 23 fixed to the upper surface of the partition wall 8 via a ball bearing 24 or the like.
The rotating hollow body 20 is rotationally driven by the electric motor M at a constant speed of, for example, about 20 to 100 rpm, more preferably about 60 rpm.

  When the rotary hollow body 20 is rotationally driven by the drive mechanism 20, the lower end (atmospheric flow output portion 18 a) of the second vertical pipe 18 is rotationally driven along the anti-trap side row of the six filters 9. The filter 9 is intermittently opposed to the anti-trap side of each filter 9 in order. As a result, at the moment when the lower end (atmospheric flow output portion 18a) of the third hollow tube 18 opposes the counter trap side of one filter 9, the negative pressure in the internal space of the filter 9 causes the outside air communication hole 2H to A certain amount of air is inhaled and sent into the internal space of the filter 9. The sent air passes through the pores of the filter 9 in the direction opposite to that at the time of suction by the action of the negative pressure outside the filter 9. During the air passage in the reverse direction, the adhered particles are separated (so-called backwashing), and clogging is prevented.

  In addition, inside the lower end of the second vertical pipe 18 (an example of the other end of the second hollow portion), a resin movable sleeve 19 having both ends opened is movable up and down relative to the second vertical pipe 18. It is locked to. The movable sleeve 19 is held in a state where its lower end is lightly pressed against the upper surface of the flat partition wall 8 by its own weight, thereby closing the gap existing between the lower end of the second vertical pipe 18 and the partition wall 8. Fulfills the function. Two annular grooves 19 </ b> C are formed on the outer peripheral surface of the movable sleeve 19. These annular grooves 19 </ b> C confine air inside, thereby facilitating relative movement of the movable sleeve 19 with respect to the second vertical tube 18 and at the same time suppressing air outflow from the gap between the second vertical tube 18 and the movable sleeve 19. Work. The inner diameter of the lower end of the movable sleeve 19 is equal to or slightly larger than the through hole 8H formed in the partition wall 8.

[Another embodiment]
<1> In the embodiment of the suction type vacuum cleaner illustrated in FIGS. 7 and 8, several modifications are added to the configuration of the dust removing mechanism 11. Here, the movable sleeve 31 locked so as to be relatively movable with respect to the second vertical tube 18 includes a diameter-expanding sleeve 32 extending downward from the lower end thereof. The diameter-expanding sleeve 32 forms a diameter-enlarged communication chamber having an inner diameter that exceeds twice the opening diameter of the one filter 9 on the side opposite to the trap, so that one filter 9 and the outside air communication hole 2H for opening to the atmosphere The communication state (the length of time for which the communication state lasts) can be prolonged, and the amount of air flowing back into the internal space of the filter 9 is increased. As a result, the backwashing ability for the filter 9 is enhanced.

  Further, a disc-shaped flange-like cover 33 extends from the lower end of the diameter-expanding sleeve 32. The width of the flange-shaped cover 33 is set to be slightly larger than the opening diameter of the filter 9 on the side opposite to the trap. A resin plate 33 a is laid on the entire lower surface of the flange-like cover 33, and the resin plate 33 a is kept lightly pressed against the upper surface of the partition wall 8 by the action of the movable sleeve 31. The flange-like cover 33 regulates the communication state between the inside of the second vertical pipe 18 and the decompression chamber R2 in an angular phase in which the other end of the second vertical pipe 18 partially overlaps the anti-trap side of the filter 9. Thereby, the phenomenon that the decompression state of the decompression chamber R2 is reduced by air leakage can be suppressed by the dust removal mechanism, and the dust removal effect by the dust removal mechanism 11 can be enhanced.

  A plurality of engaging projections 34 extending outward in the radial direction are provided on the outer periphery of the flange-shaped cover 33. At several locations on the upper surface of the partition wall 8, engagement pins 36 that can be engaged with the engagement protrusions 34 are erected along a circumference centered on the axis X. When the movable sleeve 31 revolves together with the second vertical pipe 18 by the driving force of the electric motor M, any one of the engagement protrusions 34 is kicked by the fixed engagement pin 36, so that the movable sleeve 31 is second. The forced relative rotation can be periodically made with respect to the vertical pipe 18. As a result, the movable sleeve 31 is caught by the inner surface of the second vertical pipe 18 and stops moving, and a phenomenon in which a gap is formed between the flange-shaped cover 33 and the upper surface of the partition wall 8 is suppressed.

  It should be noted that some of the plurality of configurations employed in the suction cleaner 50 illustrated in FIGS. 7 and 8 may be omitted, and only other configurations may be employed. For example, a configuration including a disk-like flange-shaped cover 33 and a forced relative rotation mechanism of the movable sleeve 31 in abbreviated diameter communication chamber, and a compulsion of the diameter-increasing communication chamber movable sleeve 31 in abbreviated disk-shaped flange-shaped cover 33. A configuration including a relative rotation mechanism, or a configuration in which the forced relative rotation mechanism of the movable sleeve 31 is omitted, and a diameter-enlarged communication chamber and a disc-shaped flange-shaped cover 33 are provided. Alternatively, it may be configured to include only one of the expanded communication chamber, the disk-shaped flange-shaped cover 33, and the forced relative rotation mechanism of the movable sleeve 31.

<2> By providing the inner peripheral surface of the movable sleeve 19 with a plurality of blades having a pitch inclination with respect to the axis, the movable sleeve 19 is shaped like a windmill by the flow of air flowing toward the filter 9. It is good also as a structure driven rotationally.

<3> In each of the embodiments described above, at an angular phase in which the other end of the second vertical tube 18 partially overlaps the anti-trap side of the filter 9 during the rotational driving of the rotary hollow body 20, instantaneously Since a communication state between the inside of the second vertical pipe 18 and the decompression chamber R2 occurs, a phenomenon in which the decompression state of the decompression chamber R2 slightly decreases occurs. As a mechanism for suppressing this phenomenon, an electromagnetic valve type shutter mechanism that switches between the state in which the inflow of air to the flexible hose 13 is enabled and the state in which the inflow of air is disabled, and the shaft at the other end of the second vertical pipe 18 There can be provided an angle detection mechanism for determining the timing when the center coincides with the axis on the anti-trap side of the filter 9 and a control device for switching the shutter mechanism to the open state only at the timing determined by the angle detection mechanism. The shutter mechanism can be provided in the sleeve 12 to which the flexible hose 13 is connected, the rotary hollow body 20, or the like. As the angle detection mechanism, for example, a rotation sensor in which the same number of contacts as the number of the filters 9 are arranged on the upper end surface of the first vertical pipe 16 is provided on the circumference, and based on a rectangular signal output from the rotation sensor. The shutter mechanism may be controlled on / off.

<4> In the embodiment of the suction type vacuum cleaner illustrated in FIG. 9, the annular ventilation space between the inner peripheral surface of the fixed vertical tube 15 and the outer peripheral surface of the first vertical tube 16 is eliminated, and the inside of the fixed vertical tube 15 The peripheral surface and the outer peripheral surface of the first vertical pipe 16 are configured to rotate relative to each other while closely contacting each other. On the side surface of the first vertical pipe 16, the same number of through holes 46 </ b> H as the filter 9 are formed at an angle coincident with the filter 9. Therefore, the inside of the flexible hose 13 and the inside of the first vertical tube 16 are in communication only at an angular phase where the center of the second vertical tube 18 coincides with the center of the filter 9 on the side opposite to the trap. In this configuration, the gap between the other end of the second vertical tube 18 and the upper surface of the partition wall 8 when the other end of the second vertical tube 18 is located near the intermediate position on the side opposite to the trap of the two adjacent filters 9. Can be prevented from leaking to the decompression chamber R2. Further, in order to prevent a communication state between the inside of the second vertical pipe 18 and the decompression chamber R2 in an angular phase in which the other end of the second vertical pipe 18 partially overlaps the anti-trap side of the filter 9, the above flange is used. A shaped cover 33 can also be provided.

<5> A cylindrical auxiliary side wall 28 erected vertically on the upper surface of the partition wall 8 is provided as in the suction type vacuum cleaner 60 whose main part is illustrated in FIGS. 10 and 11. The hollow elbow member 29 is provided to connect the through hole 28H of the filter 9 to the anti-trap side of each filter 9, and the distal end of the horizontal tube 17 of the rotating hollow body 20 that is driven to rotate about the axis X by the motor M is the inner surface of the auxiliary side wall 28. It is also possible to configure so as to face each other. Even in this configuration, a plurality of filters 9 are provided, and the dust removing mechanism realizes a mechanism that alternately and repeatedly communicates the other end of the piping member to the counter-trap side of the filter 9 at a constant interval.

<6> Contrary to the above embodiment, the other end of the flexible hose 13 connected to the outside air communication hole 2H at one end is opposed to the upper surface of the partition wall 8 at a position coinciding with the virtual circle C. It is also possible to adopt a configuration in which the atmosphere flows into the filter 9 in order by fixing and arranging the partition wall 8 to which the plurality of filters 9 are attached and rotating around the axis X by a motor or the like.

<7> In the above embodiment, the rotary hollow body 20 is always driven to rotate while the fan unit 3F of the suction cleaner 40 is being driven. However, the filter 9 needs to be backwashed. A drive switch that can be implemented only at a certain time may be provided. In this case, it is preferable to perform motor control so that the rotating hollow body 20 stops in a state where the rotational phase of the second vertical pipe 18 is positioned at an intermediate position between the two filters 9. Further, as a means for determining the average clogging state of the six filters 9, a sensor capable of determining the speed or flow rate of the air flow formed by the fan unit 3F is provided near the suction port 3a on the lower surface of the third casing 3 or the like. It is possible to provide a control device that determines the time required for backwashing based on the determination result by the sensor and automatically turns on / off the rotational drive of the rotary hollow body 20.

<8> In the embodiment shown in FIGS. 1 to 6, the rotary hollow body 20 is described as being configured to continuously rotate at a constant speed. However, in order to enhance the backwash effect, for example, the second vertical pipe shown in FIG. 2. The rotating hollow body 20 is stopped for a certain period of time at an angular position where the lower end of 18 faces the anti-trap side of one filter 9, and then discontinuously so as to advance toward the anti-trap side of the next filter 9. It may be configured to rotate. For this purpose, for example, a rotation sensor in which the same number of contacts as the number of the filters 9 are arranged circumferentially is provided on the upper surface of the first vertical pipe 16, and a rectangular signal output from the rotation sensor is separately provided. The driving of the motor M may be ON / OFF controlled based on the signal from the timer provided in the above.

<9> In each of the above embodiments, a flow rate sensor (not shown) for determining the flow rate of air is disposed in the flow path extending from the outside air communication hole 2H to the tip of the second vertical pipe 18, and the state of each filter You may give the function to check (the degree of clogging, the presence or absence of a crack, etc.).
In addition, by combining this configuration with the above-described configuration of discontinuous rotation in which the lower end of the second vertical pipe 18 is stopped at a position facing the filter 9 for a certain period of time, according to the check result of the ventilation efficiency of each filter It is possible to adopt a form in which control for changing the stop time is performed.
In other words, an appropriate stop time may be determined based on the average value of the air flow speeds in the plurality of filters 9, or longer than the others for the filters 9 determined to have low ventilation efficiency. It is good also as a form with which backwash operation is applied over time.

<10> In the above embodiment, the suction unit integrally installed on the decompression chamber (second casing 2) as the fan unit 3F is separated from the decompression chamber (for example, a room using a suction-type cleaner) May be arranged in a separate chamber) and connected to the decompression chamber by piping (such as a hose).

The perspective view of the suction type vacuum cleaner by this invention 1 is an exploded perspective view of the suction type vacuum cleaner of FIG. The partially broken side view of the principal part of the suction type vacuum cleaner of FIG. The top view of the 2nd casing of the suction type vacuum cleaner of FIG. The partially broken bottom view of the 2nd casing of the suction type vacuum cleaner of FIG. Broken side view of the dust removal mechanism provided in the suction type vacuum cleaner of FIG. The principal part top view of the suction type vacuum cleaner by another embodiment of the present invention. FIG. 7 is a partially broken side view of the main part of the suction type vacuum cleaner of FIG. The partially broken top view of the suction type vacuum cleaner by another embodiment of this invention The perspective view of the principal part of the suction type vacuum cleaner by another embodiment of this invention. The partially broken top view of the principal part of the suction type vacuum cleaner of FIG.

Explanation of symbols

C virtual circle M electric motor S annular ventilation space R1 dust collection chamber R2 decompression chamber 1 first casing 1H through-hole 2 second casing 3 third casing 3F fan unit 5 suction hose 8 partition 8H through-hole 9 filter 11 dust removing mechanism 13 Flexible hose (example of first piping)
16 1st vertical pipe (an example of 2nd piping)
15 Fixed vertical pipe (an example of a branch)
17 Horizontal pipe (example of second pipe)
18 Second vertical pipe (an example of second pipe)
18a Large airflow output portion 19 Movable sleeve 19C Annular groove 20 Rotating hollow body 21 Drive mechanism 23 Boss portion 28 Auxiliary side wall 28H Through hole 29 Hollow elbow member 31 Rod 40 Suction type vacuum cleaner

Claims (7)

Inside the casing, a dust collection chamber for storing dust sucked in by the dust collection means, a decompression chamber partitioned from the dust collection chamber by a plurality of filters and partition walls, and air in the decompression chamber to the outside of the casing Pressure reducing means for discharging and holding the pressure reducing chamber at a low pressure,
Piping means provided inside the decompression chamber to communicate each of the plurality of filters with an outside air communication hole provided in the casing, and a rotation drive mechanism for sequentially switching the filters in communication with the piping means. A vacuum cleaner. The piping means includes a first pipe that communicates a branch portion provided in the center of the decompression chamber and the outside air communication hole, and a second pipe that communicates an opening portion of one filter and the branch portion. And
The one end of the second pipe on the branch part side is rotatably connected to the branch part, and the rotary drive mechanism is configured to rotate the second pipe. Vacuum cleaner.   The auxiliary hollow member that is slidable along the axis of the other end and is urged toward the partition wall is engaged with the other end of the second pipe on the filter side. 2. The suction type vacuum cleaner according to 2.   The suction type vacuum cleaner according to claim 3, wherein an annular groove for receiving an airflow is formed on an outer peripheral surface of the auxiliary hollow member.   The suction type vacuum cleaner according to claim 3 or 4, wherein an auxiliary rotation drive mechanism is provided that forcibly rotates the auxiliary hollow member with respect to the piping member based on a rotational force of the rotation drive mechanism.   The suction type vacuum cleaner according to any one of claims 2 to 5, wherein an enlarged communication chamber having an inner diameter that exceeds a diameter of the opening of the filter is provided at the other end of the second pipe.   The suction type vacuum cleaner according to any one of claims 2 to 6, wherein a flange-shaped cover having a width at least equal to the diameter of the opening of the filter is provided at the other end of the second pipe.

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