JP4937984B2 - Vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner in which a negative pressure generation source and a dust storage part are provided inside a casing, and more particularly to a vacuum cleaner that reduces noise during use.

  In recent years, the performance of a motor or the like as a negative pressure generation source provided in a vacuum cleaner has been improved, and the suction power of the vacuum cleaner has been further strengthened. As a result, the cleaning efficiency is improved, but there is a problem that the noise of the airflow caused by the driving sound of the motor and the negative pressure source increases.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 10-201677) discloses a vacuum cleaner having a double wall structure for the dust storage chamber and the motor storage chamber. In this vacuum cleaner, a plurality of through holes are formed in the inner walls of the dust storage chamber and the motor storage chamber, and a sound absorbing material is disposed between the inner wall and the outer wall.

Thus, when the motor is driven, it is intended to reduce the noise generated by the motor itself and the noise emitted from the motor and released to the outside through the dust storage portion.
Japanese Patent Laid-Open No. 10-201677

In the electric vacuum cleaner described in Patent Document 1, the motor housing chamber or the like has a double wall structure, and a sound absorbing material is disposed inside the double wall, thereby reducing noise generated from the motor itself or the dust storage chamber. Can be expected. However, it cannot be said that such a noise reduction effect is sufficient, and furthermore, it cannot be said that various noises such as wind noise generated from the storage chamber of the dust storage portion are reduced.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric vacuum cleaner that reduces various noises such as wind noise generated from a storage chamber of a dust storage portion.

In order to achieve the above object, the present invention provides:
A housing,
A dust storage section for rotating the intake air in a cylindrical dust container disposed in the housing to separate the dust in the intake air;
A negative pressure source that generates negative pressure;
A duct for communicating the dust reservoir and the negative pressure source;
A first space surrounded by the housing and formed in a cylindrical shape around the dust storage portion;
A second space constituting an outlet portion of air exhausted from the negative pressure generation source;
A communication port for communicating the first space and the second space;
With
An opening communicating with the outside is formed in the casing surrounding the first space,
A part of the air discharged from the negative pressure generation source to the second space is discharged from the second space to the first space through the communication port, The electric vacuum cleaner is configured to be discharged from the casing through the opening to the outside.
As a result, air flows from the second space to the first space, and noise generated in the first space is silenced by absorption or interference.
A third space may be further formed between the first space and the second space. In this case, the communication port includes a first communication port formed in a first boundary wall that partitions the first space and the third space, and a second space that partitions the second space and the third space . It consists of the 2nd communicating port formed in the boundary wall.

  According to the vacuum cleaner according to the present invention, it is possible to reduce various noises such as wind noises emitted from the first space in which the dust storage part is accommodated.

Hereinafter, the structure of a vacuum cleaner according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows the structure of the electric vacuum cleaner in the present embodiment, and is a horizontal sectional view cut along a line along II in FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG. 1, FIG. 3 is an exploded perspective view of the entire cleaner body, and FIG. 4 is a longitudinal sectional view of the entire cleaner body. 5 is a cross-sectional view taken along the line XX in FIG. 4, FIG. 6 is a cross-sectional view taken along the line YY in FIG. 4 (excluding the dust cup), and FIGS. 7 and 8 are views of the vacuum cleaner body according to another embodiment. 1 and 2 are equivalent views, FIG. 9 is an overall view of the vacuum cleaner X according to the present embodiment, FIG. 10 is an exploded perspective view of a dust cup and a helical compression portion, and FIG. 11 is a perspective view of the spiral portion. It is.
Note that the vacuum cleaner main body 1 shown in FIG. 9 has a different form from that shown in FIG.
First, the schematic configuration of the electric vacuum cleaner X according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 9, the electric vacuum cleaner X is roughly configured to include a vacuum cleaner body portion 1, an air inlet portion 2, a connection pipe 3, a connection hose 4, an operation handle 5 and the like. The vacuum cleaner main body 1 includes a negative pressure generation source 221 such as an electric blower described later, a cyclone dust collecting unit Y, a control device (not shown), and the like. The cyclone dust collecting part Y will be described in detail later.
The operation handle 5 is provided with an operation switch (not shown) for allowing the user to operate the vacuum cleaner X and to select an operation mode. A display unit (not shown) such as an LED for displaying the current state of the electric vacuum cleaner X is also provided in the vicinity of the operation switch.

The cleaner body 1 is connected to the intake port 2 via the connection hose 4 connected to the front end of the cleaner body 1 and the connection pipe 3 connected to the connection hose 4. ing.
Therefore, in the electric vacuum cleaner X, the negative pressure generation source 221 incorporated in the vacuum cleaner main body 1 is operated, whereby intake from the intake port 2 is performed. Then, the air sucked from the intake port portion 2 flows into the cyclone dust collecting portion Y through the connection pipe 3 and the connection hose 4. In the cyclone dust collecting unit Y, dust is centrifuged from the sucked air. The air after the dust is separated by the cyclone dust collecting unit Y is exhausted from an exhaust hole 151 (described later) provided at the rear end of the cleaner body 1.

  Next, the structure of the vacuum cleaner according to the present invention and the outline of the air supply / exhaust path will be described based on FIGS. 1 and 2 schematically showing the vacuum cleaner according to the present embodiment.

  As shown in FIGS. 1 and 2, the vacuum cleaner main body 1 according to the present embodiment includes a housing 101, a dust storage unit 201 housed in a front portion of the housing 101, and a housing 101. And a negative pressure generating source 221 accommodated in the rear part. 1 and 2, the left side is the front side of the cleaner body (the direction in which the housing 101 advances by being pulled by the connection hose 4 attached to the suction pipe 190 as shown by the arrow D), and the right side Is the rear side of the vacuum cleaner body.

  The dust storage part 201 is comprised by the dust cup 203 which comprises the lower part, and the cover body 211 which comprises the upper part. The dust cup 203 is formed in a substantially cylindrical shape with a bottom. Inside the dust cup 203, dust and air swirl at a high speed, and relatively large dust is separated from swirling air by centrifugal force during swirling.

Inside the dust cup 203 is provided a disk-shaped shielding member 205 that divides the upper space and the lower space at the center. A cylindrical exhaust cylinder 207 is connected to the upper part of the disk-shaped shielding member 205. The negative pressure generating source 221 such as a fan is connected to the exhaust cylinder 207 via a duct 230.
A flexible suction pipe 190 connected to the inlet port 2 such as a nozzle is connected to the dust reservoir 201 via the connection hose 2 in the circumferential direction of the cylindrical portion. Dust sucked from the intake port 2 moved along the cleaning surface such as the floor flows into the dust storage unit 201 via the suction pipe 190 together with the sucked air.

  The negative pressure generation source 221 includes a motor 223 having a rotary shaft arranged in the vertical direction and a fan 225 connected to the rotary shaft and driven by the motor 223.

  Accordingly, the air sucked from the suction pipe 190 connected in the circumferential direction of the dust reservoir 201 due to the negative pressure generated by the negative pressure generation source 221 moves along the inner surface of the dust reservoir 201 in the circumferential direction. As described above, the relatively large dust in the airflow contacts the inner peripheral surface of the dust storage unit 201 due to centrifugal force and stalls, and is stored in the bottom of the dust storage unit 201. . On the other hand, the air flow from which the relatively large dust is removed is drawn into a duct 230 (an example of an air passage) through an exhaust pipe 207 as shown by an arrow in FIG. 1 and then enters a negative pressure generation source 221. After that, it passes through a filter 241 provided at the outlet of the negative pressure generation source 221 and is discharged to a ventilation path 243 that occupies the lower space of the negative pressure generation source 221. The discharged air is discharged into the room through an exhaust hole 151 provided in the rear part of the ventilation path 243.

The duct 230 (or the exhaust pipe 207) is provided with a filter (not shown). Fine dust that could not be removed by centrifugal force due to swirling in the air flow in the dust cup 203 is removed by the filter. Removed from. This prevents fine dust from being led to the negative pressure generation source 221. Further, the air discharged from the negative pressure generation source 221 is further purified by a filter 241 provided on the downstream side of the negative pressure generation source 221 and then released into the room.
Since the air passing through the filter 241 is directly discharged into the room, the filter 241 is capable of capturing finer dust than that provided in the vent hole 209 of the exhaust tube 207.

As shown in FIG. 2, a cord reel 251 that winds up the power cord 253 is arranged along with the negative pressure generating source 221. The cord reel accommodating space in which the cord reel 251 is provided communicates with the front side of the vent passage 243 connected to the negative pressure generating source 221 at the front portion thereof through a vent hole 255.
In addition, the cord reel housing space is communicated with the rear end side of the vent passage 243 connected to the negative pressure generation source 221 through the vent 257 at the rear end. As a result, a ventilation path is formed from the ventilation hole 255 to the ventilation hole 257 via the cord reel housing space, and the cord reel 251 is cooled.

The dust storage unit 201 is installed in a front portion inside the housing 101, is surrounded by the housing 101, and is accommodated in a first space 260 that surrounds the dust storage unit 201. The negative pressure generation source 221 and the cord reel 251 are disposed in contact with the ventilation path 243 formed in the rear part inside the housing 101.
A space on the front side of the air passage 243, that is, a space at an outlet where air blown out through the filter 241 is discharged will be referred to as a second space 264. The first space 260 and the second space 264 are in contact with each other via a third space 262 sandwiched therebetween.

The first space 260 and the third space 262 are partitioned by a first boundary wall 121. In addition, a second boundary wall 131 is provided between the third space 262 and the second space 264. That is, the third space 262 and the second space 264 are partitioned by the second boundary wall 131.
Therefore, the third space 262 is sandwiched between the first boundary wall 121 and the second boundary wall 131, and the outer peripheral side thereof is surrounded by the casing 101.

A communication port 133 is provided in the second boundary wall 131, and the second space and the third space are communicated with each other through the communication port 133.
Further, the first space 260 and the third space 262 communicate with each other through a communication port 270 formed in the first boundary wall 121. The casing 101 surrounding the first space 260 has a slight gap G1 at the joint of the members constituting the casing 101, and the first space 260 is connected to the outside via the gap G1. Communicate. Of course, another opening may be provided in the housing 101 in addition to the gap G1 or instead of the gap G1.

  Since the vacuum cleaner body 1 of the vacuum cleaner X according to this embodiment is configured as described above, the exhaust discharged from the negative pressure source 221 into the second space 264 is thereafter It is discharged to the outside of the casing 101 through the first to third exhaust paths described below.

  The first exhaust path is an exhaust path that passes through the ventilation path 243 provided below the negative pressure generation source 221 and is discharged from the exhaust hole 151. The second exhaust path is an exhaust path that passes through the cord reel housing space in which the cord reel 251 is disposed via the vent hole 255 and is discharged from the exhaust hole 151 via the vent hole 257.

The third exhaust path is guided to the third space 262 through the communication port 133, and further passes through the communication port 270 to the first space 260, from there through the gap G1 or other opening. This is an exhaust path exhausted to the outside.
As shown in FIGS. 1 and 2, the gap G1 is formed at an arbitrary position communicating with the first space 260 of the casing 101, but the casing 101 is prevented from blowing up the indoor dust by the blown-out air. It is desirable that it be formed on the upper surface of the. In FIG. 1 and FIG. 2, the gap G1 is drawn larger than actual.

  In the present embodiment, a third space 262 is formed between the first space 260 and the second space 264, and a part of the exhaust is passed through the third exhaust path 262 to the first space. The product is discharged from 260. As a result, the flow rate of the exhaust discharged from the exhaust hole 151 provided at the rear end of the housing 101 can be reduced, and noise such as wind noise generated when the exhaust is discharged from the exhaust hole 151 is reduced. can do.

  The flow rate of the exhaust led to the outside through the third exhaust path is preferably about 5% of the flow rate of the exhaust led to the first and second exhaust paths. As a result, the flow rate of the exhaust gas from the exhaust hole 151 can be reduced to such an extent that the effect of reducing the exhaust noise can be obtained. On the other hand, if the flow rate is about 5%, generation of new noise due to exhaust from the third exhaust path can be minimized. However, the flow rate of the exhaust gas guided to the third exhaust path is not limited to 5%, and may be appropriately determined in consideration of other factors.

  The flow rate of the exhaust gas guided to the third exhaust path can be set by adjusting the opening areas of the communication ports 133 and 270, the flow path resistance in the third space, and the opening area of the gap G1.

  For example, in order to further reduce noise in the third exhaust path, the sound absorbing material 123b may be disposed in one or both of the sound absorbing material 123a and the first space 260 in the third space 262. As the sound absorbing material, a resin material such as foamed resin, or a fiber such as glass wool or felt can be used. As a result, the noise of the exhaust discharged through the third space 262 can be further reduced. Further, it is possible to suppress the noise from the motor or the like from being released to the outside via the third exhaust path.

  Further, at least a part of the exhaust from the third exhaust path may be exhausted toward the floor surface. Exhaust exhaust to the floor is preferred because exhaust noise is most difficult to dissipate. Therefore, exhaust noise from the third exhaust path can be further reduced by discharging part of the exhaust toward the floor surface. By restricting the flow rate of the exhaust discharged to the floor at this time, it is possible to avoid the dust on the floor being blown off by the exhaust.

  Next, the first to third exhaust paths will be specifically described with reference to FIGS. 3 to 6 showing more specific structures. 3 is an exploded perspective view of the cleaner body according to the present embodiment, FIG. 4 is a longitudinal sectional view thereof, FIG. 5 is a sectional view taken along line XX in FIG. 4, and FIG. It is sectional drawing (except for a dust cup). Note that members corresponding to those described in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will not be repeated.

  As shown in FIG. 3, the housing 101 of the vacuum cleaner shown in FIGS. 3 and 4 is roughly divided into a front housing 301, a dust cup housing 321, an upper housing 341, and a rear housing 361. , The lower casing 381 is divided into five members. These members are fitted to each other and fixed to each other by a lock mechanism or screwing that can be released by manual operation.

  The front housing 301 constitutes the front part of the housing 101. A suction pipe 190 is connected to the front housing 301. The front housing 301 has a first space 260 in which the dust storage unit 201 is accommodated.

  The dust cup housing 321 is fitted on the upper portion of the front housing 301 and is detachably attached by a releasable lock mechanism. The dust cup unit housing 321 holds the upper end of the dust storage unit 201. Further, the upper portion of the first space 260 in which the dust storage unit 201 is accommodated is sealed by the dust cup unit housing 321.

  The lower housing 381 constitutes the bottom surface of the housing 101 and the side surface continuous therewith. Wheels 401 are attached to the side surface of the lower housing 381. Further, a freely changeable wheel 403 is attached to the front bottom surface of the lower housing.

  A front housing 301 is fitted into the front portion of the lower housing 381, and is fixed by screwing. Inside the lower housing 381, a negative pressure generating source 221 and a duct 230 attached to the upper portion are accommodated.

  A part of the third exhaust path is formed along the upper surface of the front portion of the lower housing 381 (the portion where the dust cup housing 321 is located above).

  As described above, the second boundary wall 131 is provided between the second space 264 and the third space 262 in which the negative pressure generation source 221 is accommodated. The second boundary wall 131 is provided with a communication port 133 that allows the second space 264 and the third space 262 to communicate with each other.

  An upper housing 341 is fixed to the lower housing 381 so as to cover the negative pressure generation source 221 and the duct 230. The upper housing 341 is fitted into the lower housing 381 and fixed by screwing.

  A rear end casing 361 is attached to the rear ends of the lower casing 381 and the upper casing 341. The rear end housing 361 is provided with a large number of small holes constituting the exhaust holes 151 at the center thereof.

  With reference to FIG. 3 and FIG. 4, the flow of the air in the vacuum cleaner of this Embodiment is demonstrated. The motor 223 of the negative pressure generation source 221 is driven to generate a negative pressure at the negative pressure generation source 221. Due to the negative pressure, air containing dust is sucked from the air inlet 2 shown in FIG. The sucked air is guided by the suction pipe 190 through the connection hose 4 and reaches the dust storage unit 201.

  The air containing the dust that has reached the dust storage unit 201 swirls at high speed along the inner wall of the dust cup 203 in the dust storage unit 201. At this time, the dust comes into contact with the inner peripheral surface of the dust storing portion 201 due to the centrifugal force of the swirling flow, and is dropped and separated at a loss of speed. The separated dust stays at the bottom of the dust cup 203.

  The air from which the dust has been separated is sucked into the negative pressure generation source 221 via the duct 230. The air sucked into the negative pressure generation source 221 is exhausted outside the second pressure generation source 221 (second space 264). The exhaust discharged into the second space 264 is discharged outside the casing 101 through the three exhaust paths as described above.

  The first exhaust path is an exhaust path that passes through the ventilation path 243 provided below the negative pressure generation source 221 and is discharged from the exhaust hole 151. The air passage 243 is formed between the inner bottom surface of the lower housing 381 and the negative pressure generation source 221.

  The second exhaust path is an exhaust path that passes through the cord reel housing space in which the cord reel 251 is disposed via the vent hole 255 and is discharged from the exhaust hole 151 via the vent hole 257.

The third exhaust path is guided to the third space 262 via the communication port 133 formed in the boundary wall 131, and further passes through the communication port 270 formed in the boundary wall 121 to the first space 260. It is an exhaust path that enters and then is discharged to the outside through the gap G1 or another opening.
When FIG. 4 is seen, the third space 262 seems to be hardly present, but the first boundary wall 121 is curved and provided so as to surround the cylindrical dust cup 203 as shown in FIG. Since a planar boundary wall 131 for partitioning the second space 264 and the third space 262 is provided at the rear part thereof, the cross section different from the cross section shown in FIG. is doing.
Further, it can be understood from FIG. 5 that the first space 260 is a sufficiently large cylindrical space surrounding the dust cup 203.
Furthermore, the communication port 270 formed in the boundary wall 121 and communicating the third space 262 and the first space 260 is shown in FIG. 6 which is a cross-sectional view taken along the arrow line YY except for the dust cup 203 in FIG. As described above, a plurality of 270a provided at the center of the boundary wall 121, 270b and 270c provided at the left and right portions may be formed, or only the center 270a may be provided. The size, position, or number of these communication ports 270 are appropriately set according to the amount of air passing therethrough, the flow velocity, and the like.
For example, according to an experiment, when the communication port 270 is 20 to 25 m / m long and 2 to 3 m / m wide, a great silencing effect is obtained.

  As shown in FIG. 3, the housing 101 is configured by fitting five members of a front housing 301, a dust cup housing 321, an upper housing 341, a rear end housing 361, and a lower housing 381. Therefore, a slight gap G1 is formed in the fitting portion unless a special airtight treatment is performed.

As described above, in the present embodiment, the third space 262 is formed between the first space 260 and the second space 264, and the first space 260 and the second space 262 are interposed via the third space 262. The second space 264 is communicated, and a third exhaust path is provided to exhaust from the second space 264 through the first space 262 through the gap G1 or other openings, but this is an example, In the idea of the present invention, the third space 262 is not necessarily required. As another embodiment, for example, as shown in FIGS. 7 and 8, the first space 260 and the second space 264 are partitioned by only the boundary wall 121 without the third space 262, and the first space 260. The second space 264 may be communicated with a communication port 270 formed in the boundary wall 121.
As to whether or not the third space 262 is interposed as described above, various modes such as the presence / absence and size of the sound can be considered depending on the concept of silencing.
For example, when seeking the principle of muffling and the principle of muffling through each room like a maze to reduce pressure before being released into the atmosphere, or to “positive waves” On the other hand, in the case of adopting the principle of interference in which the wave height disappears by canceling each other's force by hitting (superimposing) “negative waves” of the same size, the significance of the third space 262 Will be very different. Therefore, for example, by dividing the third space into a plurality of parts and making the sizes slightly different, such as a multistage expansion chamber having different capacities, a wide band of frequencies can be effectively obtained. It can also be muted.
Further, as described above, by exhausting part of the exhaust through the third exhaust path, the flow rate of the exhaust discharged from the exhaust hole 151 provided in the rear end portion of the housing 101 is reduced, so that the exhaust hole The reduction of wind noise caused by the airflow discharged from 151 can also be targeted.
Further, in this embodiment, since a part of the exhaust is released through the first space 260, the third exhaust path is affected by noise generated in the first space, for example, noise generated by vibration of the dust cup 203. It is also conceivable to reduce the overall noise by interfering with the noise flowing through the.

  As described above, when all the exhaust from the third exhaust path is discharged from the gap G1 formed at the joint of the plurality of members constituting the housing 101, it is not necessary to form a new exhaust port. . As a result, it is possible to avoid deterioration of aesthetics due to newly providing an exhaust port. Even when the lower casing 381 is provided with the exhaust port 387, the exhaust port 387 cannot be seen in appearance, so that deterioration of the aesthetic appearance can be avoided.

  In order to further reduce the noise in the third exhaust path, the sound absorbing materials 123a and 123b may be arranged in one or both of the third space 262 and the first space 260 as described above. As a result, the noise in the third exhaust path can be further reduced. In addition, it is possible to suppress the noise from the motor or the like from being released to the outside via the third exhaust path.

  Furthermore, a filter may be attached to the communication port 133 provided between the second space 264 and the third space 262. By attaching the filter, it is possible to further improve the cleanliness of the exhaust discharged through the third space 262, or to absorb noise. In addition, the flow rate to the third exhaust path can be adjusted by adjusting the flow path resistance of the filter.

  In the present embodiment, a so-called cyclonic vacuum cleaner that separates dust by centrifugal force has been described. However, the present invention can also be applied to a paper pack type vacuum cleaner that stores dust in a paper pack. is there.

The vacuum cleaner according to the embodiment shown in FIG. 4 includes a helical compression unit 153 that compresses dust accumulated in the dust cup 203 as necessary.
Here, in addition to FIG. 4, referring to FIG. 11 which is a perspective view of the spiral rotary compression unit 153 and FIG. 10 which is an exploded perspective view of the dust cup 203, the compression member included in the spiral rotary compression unit 153 will be described. explain.
As shown in these drawings, the helical rotary compression unit 205 includes a helical part 153a, a rotary shaft part 153b, and the disk-shaped shielding member 205 (see FIG. 1).
The rotating shaft portion 153 b is a hollow cylinder that is fitted into a fixed fitting portion provided at the bottom of the dust cup 203.

  In the dust cup 203, the disk-shaped shielding member 205 is divided into an upper space portion (separation portion) for separating dust by a centrifugal force of a swirling flow, which will be described later, and a lower space portion (dust collection portion) for accumulating dust. ) And serve as a partition. This prevents the collected dust from rolling up and clogging the downstream filter. In addition, since it has a disk shape, dust contained in the cyclone airflow is not caught and dust can be efficiently guided to the bottom of the dust cup 203.

The rotating shaft portion 153b extends spirally toward the inner bottom surface of the dust collecting chamber 105 with the rotating shaft portion 153b as the center, and the upper and lower surfaces thereof are centered on the vertical central axis P. A plate-shaped spiral portion 153a (an example of a compression member) having a spiral curved surface is provided. The spiral portion 153a moves the dust accumulated in the dust cup 203 toward the bottom of the dust cup 203 when rotated about the vertical axis. At this time, the spiral curved surface of the spiral portion 153a is formed in such a direction that the screw is retracted by the rotation of the compression member when the spiral curved surface is assumed to be a screw. The dust can be moved downward, and the dust can be compressed between the bottom surface of the dust cup 203.
Further, when the spiral portion 153a is rotated, the spiral portion 153a is in contact with the inner bottom surface due to friction with the bottom portion of the dust cup 203 with respect to the dust that has moved to the bottom portion of the dust cup 203. Is compressed by pushing outward from the center of the rotation axis. According to such a configuration, since the dust is firmly compressed by the rotation, the amount of dust that can be accumulated in the dust cup 203 can be increased. Therefore, for example, the dust cup 203 can be downsized. In addition, since the hardly compressed dust cannot be easily dissolved, there is no problem of scattering into the air even when it is taken out, and it can be discarded as it is.

  In the vacuum cleaner shown in FIG. 3 and FIG. 4, the effect of reducing the exhaust noise according to the present invention was confirmed by experiments. As a comparative example, the third space 262 is provided, but since the boundary wall 131 is not provided with the communication port 270, the electric vacuum cleaner having no third exhaust path and the third exhaust path is provided. The machine noise was measured and compared.

  When the noise was measured at two places, 1 meter above the vacuum cleaner and 1 meter on the side, the sound volume measured by the microphone placed 1 meter on the side was the same as in the comparative example without the third exhaust path. The average of three measurements is 55.2 dB, the average when the third exhaust path is provided (this embodiment) is 54.56 dB, and the vacuum cleaner of this embodiment is a comparative example. The noise was reduced by 0.64 dB compared to the electric vacuum cleaner.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become the basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. In addition, all modifications within the meaning and scope equivalent to the scope of claims are included.

The horizontal sectional view which shows typically the structure of the vacuum cleaner in this Embodiment, and was cut | disconnected by the line along II in FIG. The longitudinal cross-sectional view cut | disconnected by the line along II-II in FIG. The disassembled perspective view of the whole vacuum cleaner main-body part. The longitudinal cross-sectional view of the whole vacuum cleaner main-body part. XX arrow sectional drawing in FIG. YY sectional drawing in FIG. 4 (except for a dust cup). FIG. 1 is a view corresponding to FIG. 1 of a cleaner body according to another embodiment. FIG. 2 is a view corresponding to FIG. 2 of a cleaner body according to another embodiment. 1 is an overall view of a vacuum cleaner X according to the present embodiment. The disassembled perspective view of a dust cup and a helical compression part. The perspective view of a spiral part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 ... Housing 121 ... 1st boundary wall 123a, b ... Sound absorption material 131 ... 2nd boundary wall 133 ... Communication port 151 ... Exhaust hole 190 ... Suction pipe 201 ... Dust storage part 203 ... Dust cup 205 ... Disc-shaped shielding Member 207 ... Exhaust tube 209 ... Vent 211 ... Lid 221 ... Negative pressure source 223 ... Motor 225 ... Fan 230 ... Duct 241 ... Filter 243 ... Vent 251 ... Cord reel 253 ... Power cord 255, 257 ... Vent 260 1st space 262 3rd space 264 2nd space 270 Communication port 301 Front housing 321 Dust cup housing 341 Upper housing 361 Rear housing 381 Lower housing Body 387 ... exhaust hole 401 ... wheel 403 ... universal wheel G1 ... gap

Claims (4)

A housing,
A dust storage section for rotating the intake air in a cylindrical dust container disposed in the housing to separate the dust in the intake air;
A negative pressure source that generates negative pressure;
A duct for communicating the dust reservoir and the negative pressure source;
A first space surrounded by the housing and formed in a cylindrical shape around the dust storage portion;
A second space constituting an outlet portion of air exhausted from the negative pressure generation source;
A communication port for communicating the first space and the second space;
With
An opening communicating with the outside is formed in the casing surrounding the first space,
A part of the air discharged from the negative pressure generation source to the second space is discharged from the second space to the first space through the communication port, A vacuum cleaner configured to be discharged from the housing through the opening to the outside. A third space is further formed between the first space and the second space, and the communication port is formed on a first boundary wall that partitions the first space and the third space . The vacuum cleaner according to claim 1, further comprising: a second communication port formed on a second boundary wall that partitions the second space and the third space. The vacuum cleaner according to claim 2 , wherein the first communication port is formed at a central portion of the first boundary wall and / or both left and right end portions thereof.   The vacuum cleaner according to any one of claims 1 to 3, wherein an opening formed in the casing is formed on an upper side surface of the casing.

Images