Electric dust collector

Abstract

The electric vacuum cleaner includes: a housing having an intake port and an exhaust port; an air passage through which air from the suction port flows to the exhaust port; the electric air suction machine is arranged on the ventilation path; a dust collection unit provided in the air passage on the upstream side in the airflow direction relative to the electric suction machine; and a noise reduction part which forms a part of the ventilation path closer to the upstream side in the airflow direction than the dust collection part and reduces noise including airflow sound, the noise reduction part being disposed in the housing.

Description

Technical Field

[0001] This invention relates to an electric vacuum cleaner. This application claims priority based on Japanese Patent Application No. 2023-169851, filed on September 29, 2023, the contents of which are incorporated herein by reference. Background Technology

[0002] As an existing type of electric vacuum cleaner, Patent Document 1 discloses a canister-type electric vacuum cleaner. A partition wall with a connecting opening is provided between the dust collection chamber and the electric blower within the vacuum cleaner body. A vibrating plate is provided upstream of the partition wall in the airflow direction, and a sound-absorbing component is arranged in the perforated space of the vibrating plate. According to this electric vacuum cleaner, when the electric blower is operated, high-frequency sound is generated from the blower. This high-frequency sound is dispersed towards the dust collection chamber through the connecting opening on the front side of the blower. The sound-absorbing component absorbs the high-frequency sound passing through the vibrating plate, thereby reducing noise.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2012-5561 Summary of the Invention The technical problem to be solved by the present invention In the case of the electric vacuum cleaner in Patent Document 1, the sound-absorbing component between the dust collection chamber and the electric blower obstructs airflow, and the suction performance is prone to decline. Therefore, an electric vacuum cleaner that can suppress the decline in suction performance and reduce noise is desired.

[0004] The purpose of this invention is to provide an electric vacuum cleaner that takes into account the above-mentioned conditions.

[0005] Technical solutions for solving technical problems The present invention provides an electric vacuum cleaner comprising: a housing having an air intake and an exhaust port; a ventilation path for allowing air from the air intake to flow to the exhaust port; an electric suction motor disposed in the ventilation path; a dust collection unit disposed in the ventilation path upstream of the electric suction motor in the airflow direction; and a noise reduction unit formed in part of the ventilation path upstream of the dust collection unit in the airflow direction and reducing noise including airflow sound, the noise reduction unit being disposed within the housing.

[0006] Furthermore, the present invention provides an electric vacuum cleaner comprising: a housing having an air intake and an exhaust port; a ventilation path for allowing air from the air intake to flow to the exhaust port; an electric suction motor disposed in the ventilation path; and a dust collection unit disposed in the ventilation path upstream of the electric suction motor in the airflow direction. The air intake is disposed at one end of the housing in the direction of its central axis, and the exhaust port is disposed at the other end of the housing in the direction of its central axis. The ventilation path comprises: a first ventilation path connected to the other end of the electric suction motor; a second ventilation path surrounding the first ventilation path; a third ventilation path surrounding the second ventilation path; a first deflection section for deflecting air flowing out from the other end opening of the first ventilation path and guiding it to the second ventilation path; and a second deflection section for deflecting air flowing out from the one end opening of the second ventilation path and guiding it to the third ventilation path.

[0007] Furthermore, the present invention provides an electric vacuum cleaner comprising: a housing having an air intake and an exhaust port; a ventilation path for allowing air from the air intake to flow to the exhaust port; an electric suction motor disposed in the ventilation path; a dust collection unit disposed in the ventilation path upstream of the electric suction motor in the airflow direction; a first noise reduction unit forming a portion of the ventilation path upstream of the airflow direction relative to the dust collection unit and reducing noise including airflow sound; a second noise reduction unit forming a portion of the ventilation path between the dust collection unit and the electric suction motor and reducing noise including the driving sound of the electric suction motor; and a third noise reduction unit forming a portion of the ventilation path downstream of the airflow direction relative to the electric suction motor and reducing noise including the driving sound of the electric suction motor.

[0008] Beneficial effects The electric vacuum cleaner according to the present invention can reduce noise while suppressing the reduction of suction performance. Attached Figure Description

[0009] Figure 1 This is a perspective view showing a first embodiment of the electric vacuum cleaner of the present invention.

[0010] Figure 2 This is a longitudinal sectional view showing the suction inlet body of the electric vacuum cleaner according to the first embodiment.

[0011] Figure 3 This is a longitudinal sectional view showing the main body of the electric vacuum cleaner according to the first embodiment.

[0012] Figure 4 This is a longitudinal sectional view showing the area near the handle in an electric vacuum cleaner according to the first embodiment.

[0013] Figure 5This is a perspective view showing the main body of the vacuum cleaner in the electric vacuum cleaner according to the first embodiment.

[0014] Figure 6 This is a longitudinal sectional view showing the first noise reduction section and the second noise reduction section of the vacuum cleaner body according to the first embodiment.

[0015] Figure 7 This is a longitudinal sectional view showing the third noise reduction section of the vacuum cleaner body according to the first embodiment.

[0016] Figure 8 This is a longitudinal sectional view showing the first and second noise reduction parts of the vacuum cleaner body according to the second embodiment.

[0017] Figure 9 This is a longitudinal sectional view showing the third noise reduction section of the vacuum cleaner body according to the second embodiment. Detailed Implementation

[0018] The invention will now be described in further detail with reference to the accompanying drawings. Furthermore, the following description is illustrative in all respects and should not be construed as limiting the invention.

[0019] (First Implementation) Figure 1 This is a perspective view showing a first embodiment of the electric vacuum cleaner 1 of the present invention. The electric vacuum cleaner 1 is a stick-type electric vacuum cleaner, comprising a vacuum cleaner body 2 and a suction inlet body 3 detachably connected to the vacuum cleaner body 2. Figure 1 The diagram shows the state of the electric vacuum cleaner 1 cleaning the floor F. At this time, the user holds the handle 10 located at the upper end 9b of the housing 4 of the vacuum cleaner body 2. The electric vacuum cleaner 1 is positioned with the suction inlet 3 at the front, the handle 10 at the rear, and the vacuum cleaner body 2 tilted backward from the lower end 9a towards the upper end 9b. In the following description, Figure 1 The lower end 9a of the vacuum cleaner body 2 shown is called one end 9a, and the upper end 9b is called the other end 9b.

[0020] The vacuum cleaner body 2 has a cylindrical main body 5, a battery mounting portion 6 located outside one end 9a of the main body 5, and a circuit board storage portion 7 located outside the other end 9b of the main body 5. When cleaning with the electric vacuum cleaner 1, the battery mounting portion 6 is positioned behind the side of one end 9a of the main body 5, and the circuit board storage portion 7 is positioned behind the side of the other end 9b of the main body 5. The battery 8 is detachably mounted in the battery mounting portion 6. The circuit board storage portion 7 houses a circuit board 34 (see reference 1), which serves as a control unit. Figure 3 In this embodiment, the main body 5 of the housing 4 is cylindrical in shape, but not limited to cylindrical. It may be partially or entirely square in shape, or it may be a cylindrical shape with a polygonal cross-section.

[0021] Figure 2 This is a longitudinal sectional view showing the suction inlet body 3 of the electric vacuum cleaner 1 according to the first embodiment. The suction inlet body 3 has: a suction inlet main body 21 placed on the ground F; a joint portion 22 connected to the suction inlet main body 21; and a connecting pipe portion 23 connected to the joint portion 22. A suction inlet 25 is provided at the bottom of the suction inlet main body 21, and a connecting port 26 is provided at the end of the connecting pipe portion 23. A ventilation passage 27 is provided inside the suction inlet body 3 to communicate between the suction inlet 25 and the connecting port 26. By connecting the connecting pipe portion 23 to the suction inlet main body 21 via the joint portion 22, the connecting pipe portion 23 can be rotated relative to the suction inlet main body 21 in the forward and backward direction and the left and right direction.

[0022] Figure 3 This is a longitudinal sectional view of the electric vacuum cleaner 1 according to the first embodiment. Figure 4 This is a longitudinal sectional view showing the vicinity of the handle in the electric vacuum cleaner according to the first embodiment. An other end face 9c, which is substantially perpendicular to the central axis 32 of the main body 5 of the housing 4, is provided at the other end 9b, and an operating part 311 is provided on the other end face 9c. The handle 10 has: a cover 10a, which is inserted into the other end 9b of the main body 5 of the housing 4 to cover the operating part 311; and a C-shaped handle body 10b, which has two ends connected to the cover 10a. The cover 10a has a membrane portion 10c, which is substantially perpendicular to the central axis 32, between the two ends of the handle body 10b. The membrane portion 10c forms part of the inner periphery of the handle body 10b. The positions of the switches on the operating part 311 outside the membrane portion 10c are printed with text such as "Run / Stop" and "Weak Mode / Strong Mode". Furthermore, if an indicator light (e.g., an LED) is provided on the operating part 311, at least a portion of the membrane portion 10c may also be translucent to allow the light from the indicator light to pass through.

[0023] The handle body 10b is located at the other end 9b of the housing 4, such that it appears as a rod extending along the central axis 32 when viewed from the front-to-back direction, but is approximately circular when viewed from the left-to-right direction. Therefore, if a user reaches from behind the electric vacuum cleaner 1, they can naturally (without twisting their wrist) grasp the handle body 10b. In this embodiment, the handle 10 is approximately circular, but the shape of the handle 10 can be approximately oblong or approximately elliptical, or it can be approximately polygonal.

[0024] The operation unit 311 has multiple push-button switches (not shown), allowing the user to adjust the output of the electric suction motor 36 (switch between operation and stop, switch between weak and strong modes, etc.) by pressing the membrane portion 10c of the handle 10. Since the handle 10 is ring-shaped, the user can smoothly move their hand to a position easily gripped by the handle 10, depending on the tilt angle α of the vacuum cleaner 1 relative to the floor surface F. Furthermore, because the operation unit 311 is located on the part of the handle 10 that is not gripped (the membrane portion 10c), it can prevent accidental operation such as unexpected mode changes or stopping due to the user accidentally touching the switch of the operation unit 311 while gripping the handle 10. Moreover, the battery 8, which acts as a weight, is installed in the battery mounting portion 6 at the lower end 9a (one end 9a) of the vacuum cleaner body 2, thus lowering the center of gravity of the vacuum cleaner 1 and making it easier to handle. In addition, in this embodiment, since the battery 8 is heavier than the electric suction motor 36, it creates a structure that facilitates a lower center of gravity for the vacuum cleaner 1.

[0025] The housing 4 of the vacuum cleaner body 2 has an air intake 33 on the end face of one end 9a of the main body 5. The connecting tube 23 of the air intake body 3 (see reference) Figure 2 It can be detachably inserted into the suction port 33 of the vacuum cleaner body 2. (Back) Figure 1 The housing 4 has a plurality of small-hole-shaped exhaust ports 11 on the peripheral surface of the other end 9b side of the main body 5. In this embodiment, when cleaning is performed using the electric vacuum cleaner 1, the plurality of exhaust ports 11 are arranged at the rear of the main body 5. Furthermore, the plurality of exhaust ports 11 can be provided on at least one of the left and right sides of the other end 9b side of the main body 5, or on at least one of the left and right sides and the rear of the circuit board housing 7. In addition, in this embodiment, the plurality of exhaust ports 11 have three different sizes: large, medium, and small. Starting from the side closest to the other end 9b, a group of large (e.g., diameter 1.5~2.0 mm), medium (e.g., diameter 1.0~1.5 mm), and small (e.g., 0.5~1.0 mm) exhaust ports 11 are arranged sequentially (see reference). Figure 1 Alternatively, the dimensions of multiple exhaust ports 11 can be standardized.

[0026] Figure 5 This is a perspective view showing the vacuum cleaner body 2 of the electric vacuum cleaner 1 according to the first embodiment. Figure 5 The image shows the suction port 3 being removed from the suction port 33 of the vacuum cleaner body 2 and the battery 8 being removed from the battery mounting part 6 (see reference). Figure 1The electric vacuum cleaner 1 of this embodiment may also have other accessories besides the suction inlet body. Examples of other accessories include gap nozzles, brush nozzles, and hose nozzles. Therefore, the suction port 33 of the vacuum cleaner body 2 can also be equipped with other accessories besides the suction inlet body. For example, when cleaning corners of a room by connecting the gap nozzle to the vacuum cleaner body 2, if the user holds the handle 10 with one hand and supports the back of the main body 4 of the housing 4 (e.g., near the battery 8) with the other hand, it is easy to move the gap nozzle to the target position. At this time, the center of gravity is lowered due to the battery 8 located near the suction port 33, thus making the operation of the vacuum cleaner body 2 easier.

[0027] Back Figure 3 The housing 4 contains: a ventilation path 35 that directs air from the intake port 33 to the exhaust port 11; an electric suction unit 36 ​​disposed within the ventilation path 35; a dust collection section 37 disposed upstream of the electric suction unit 36 ​​in the airflow direction within the ventilation path 35; a first noise reduction section 38 disposed between the intake port 33 and the dust collection section 37 within the ventilation path 35; a second noise reduction section 39 disposed between the dust collection section 37 and the electric suction unit 36 ​​within the ventilation path 35; and a third noise reduction section 310 disposed between the electric suction unit 36 ​​and the exhaust port 11. The first noise reduction section 38 is disposed within the housing 4 and forms a portion of the ventilation path upstream of the dust collection section 37 in the airflow direction. The second noise reduction section 39 is disposed within the housing 4 and forms a portion of the ventilation path 35 between the dust collection section 37 and the electric suction unit 36. The third noise reduction section 310 is disposed within the housing 4 and forms a portion of the ventilation path 35 downstream of the electric suction unit 36 ​​in the airflow direction.

[0028] Figure 6 This is a longitudinal sectional view showing the first noise-reducing part 38 and the second noise-reducing part 39 of the vacuum cleaner body according to the first embodiment. The first noise-reducing part 38 includes a noise-reducing tube 51 and a noise-reducing cover 52 that covers the outer periphery of the noise-reducing tube 51. Furthermore, in Figure 6 In this configuration, the noise-reducing cover 52 covers a portion of the outer periphery of the noise-reducing tube 51, but may also cover the entire outer periphery of the noise-reducing tube 51. The noise-reducing tube 51 has an opening 51a at one end connected to the air intake 33 and an opening 51b at the other end connected to the inlet 37a at one end of the dust collection section 37. (As...) Figure 5As shown, the battery 8, mounted on the battery mounting section 6, is arranged on the outer surface of the housing 4 near the first noise reduction section 38 in a manner substantially parallel to the noise reduction tube 51 of the first noise reduction section 38. The noise reduction tube 51 has a ventilable structure on at least a portion of its surrounding surface. In this embodiment, the ventilable structure of the noise reduction tube 51 is a plurality of through holes 51c penetrating the inner and outer surfaces of the noise reduction tube 51. Alternatively, the ventilable structure of the noise reduction tube 51 may be a sound-absorbing material made of a ventilable material (e.g., polyurethane foam) covering the inner surface of the noise reduction tube 51. In this case, the noise reduction tube 51 may not have the plurality of through holes 51c, and may not have the noise reduction cover 52.

[0029] The space between the noise-reducing tube 51 and the noise-reducing cover 52 is called the expansion chamber 51d. The first noise-reducing part 38 is configured to reduce noise, including the ventilation sound of air flowing from the air intake 33 to the first noise-reducing part 38. The noise from the air intake 33 is transmitted to the interior of the noise-reducing tube 51 of the first noise-reducing part 38. This noise (sound wave) is introduced into the expansion chamber 51d through multiple through holes 51c of the noise-reducing tube 51 and is partially reduced by the interference of sound waves within the expansion chamber 51d. As a result, the noise level leaking to the outside of the housing 4 is reduced. Since the first noise-reducing part 38 is provided on the ventilation path 35 near the air intake 33 of the vacuum cleaner body 2, noise reduction effect can be obtained even if accessories (suction inlet body, gap nozzle, brush nozzle, hose nozzle, etc.) without noise-reducing parts are installed on the vacuum cleaner body 2.

[0030] return Figure 2 In this embodiment, a noise reduction section 24 on the intake body 21 of the intake body 3 is provided, thus achieving a noise reduction effect within the intake body 3. The intake body 21 includes a lower housing 21a, an upper housing 21b, an upper cover 21c, a rotating brush 21d, and a drive motor (not shown) for rotating the rotating brush 21d. The noise reduction section 24 on the intake body side has multiple through holes 24a in the upper housing 21b located above the rotating brush 21d, and an expansion chamber 24b serving as the space between the upper housing 21b and the upper cover 21c. The multiple through holes 24a communicate with the expansion chamber 24b. In this intake body 3, noise (sound waves), including the rotational sound of the rotating brush 21d and the ventilation sound of airflow through the intake 25, is introduced into the expansion chamber 24b through the multiple through holes 24a, resulting in partial noise reduction due to sound wave interference within the expansion chamber 24b. Consequently, the noise level leaking to the outside of the intake body 3 is reduced.

[0031] return Figure 6The dust collection section 37 has an inlet 37a at one end for air containing dust to flow in from the intake port 33, and an outlet 37b at the other end for discharging the dust-free air to the second noise reduction section 39. A dust collection bag or dust collection device is housed within the internal space of the dust collection section 43. In the case of a dust collection bag, a paper bag, which stores dust inside a breathable bag body, is used. In the case of a dust collection device, if it is a dust collection device comprising a container body and a filter, a structure is considered in which dust captured by the filter is stored inside the container body, and the dust-free air is discharged from the exhaust port of the dust collection device. Alternatively, in the case of a cyclone-type dust collection device, a structure can be considered as follows: a cyclone section including a centrifugal separation section (inner cylinder section) and a container body is used to separate dust, the separated dust is stored inside the container body, and the dust-free air is discharged from the exhaust port of the cyclone section.

[0032] A closable cover (not shown) forming part of the housing 4 is provided near the dust collection section 37. The cover can be opened to remove the dust bag or dust collection device (dust container) from the dust collection section 37 to dispose of the dust. The cover is a double-layered structure in which a part of the outer wall (housing 4) is integrated with a part of the wall forming the dust collection section 37. The cover can be opened to remove the dust bag, etc. The double-layered cover structure also reduces operating noise. Furthermore, to more effectively reduce wind noise (inhalation), a filter-type dust collection device and dust collector are preferred over a cyclone-type dust collection device. In a cyclone-type dust collection device, the wind noise increases because the wind speed increases in the cyclone separator section. With a filter-type dust collection device and dust bag, since it does not have a cyclone dust removal section, wind noise (inhalation noise) can be reduced compared to a cyclone dust removal device.

[0033] The second noise reduction unit 39 includes a noise reduction tube 53 and a noise reduction cover 54. The noise reduction tube 53 has an opening 39a at one end connected to the outlet 37b of the dust collection unit 37 and an opening 39b at the other end connected to the intake port 36a of the electric suction machine 36. The noise reduction cover 54 only needs to cover at least a portion of the outer periphery of the noise reduction tube 53; in this embodiment, it covers the entire outer periphery of the noise reduction tube 53. The noise reduction tube 53 has a straight tube portion 53a and a tapered portion 53b that extends upward toward the airflow direction (one end side). The tapered portion 53b is located on the upstream side (one end side) of the airflow direction of the noise reduction tube 53. The largest opening 39a of the tapered portion 53b is connected to the other end forming the peripheral wall of the dust collection unit 37, and the smallest opening, i.e., the other end, of the tapered portion 53b is connected to one end of the straight tube portion 91. One end of the noise reduction cover 54 is connected to the outside of the opening 39a at one end of the cone 53b, and the other end of the noise reduction cover 54 is connected to one end of the electric suction cover 55 that covers the electric suction machine 36.

[0034] The straight tube portion 53a of the noise-reducing tube 53 has a ventilable structure on at least a portion of its surrounding surface. In this embodiment, the ventilable structure of the straight tube portion 53a is a plurality of through holes 53c penetrating the inner and outer surfaces of the straight tube portion 53a. Alternatively, the ventilable structure of the straight tube portion 53a may be a sound-absorbing material made of a ventilable material (e.g., polyurethane foam) covering the inner surface of the straight tube portion 53a. In this case, the straight tube portion 53a may not have a plurality of through holes 53c, and may not have a noise-reducing cover 54.

[0035] The space between the noise-reducing tube 53 and the noise-reducing cover 54 is called the expansion chamber 53d. The second noise-reducing section 39 is configured to reduce noise including ventilation noise from the air flowing from the dust collection section 37 to the second noise-reducing section 39 and the driving noise (high-frequency sound) of the electric suction motor 36 transmitted from the electric suction motor 36 to the second noise-reducing section 39. The noise (sound waves) transmitted to the inside of the noise-reducing tube 53 to the second noise-reducing section 39 is introduced into the expansion chamber 53d through multiple through holes 53c of the straight tube section 53a, and is partially reduced due to sound wave interference within the expansion chamber 53d. As a result, the noise level leaking to the outside of the housing 4 is reduced. In addition, a pair of spacers 57 are provided between the outer surface (front and rear sides) of the noise-reducing cover 54 in the direction of the central axis 32 and the inner surface (front and rear sides) of the main body 5 of the housing 4, thereby supporting the noise-reducing cover 54 with the axis of the second noise-reducing section 39 approximately aligned with the central axis 32.

[0036] Figure 7 This is a longitudinal sectional view showing the third noise reduction section 310 of the vacuum cleaner body according to the first embodiment. The ventilation passage 35 downstream of the airflow direction of the electric suction motor 36 includes: a first ventilation passage 61 connected to the other end of the electric suction motor cover 55 located on the other end side of the electric suction motor 36; a second ventilation passage 63 surrounding the outer side of the first ventilation passage 61; a third ventilation passage 65 surrounding the outer side of the second ventilation passage 63; a first deflection section 62 that deflects and guides the air flowing out from the other end opening 85 on the other end side of the first ventilation passage 61 to the second ventilation passage 63; and a second deflection section 64 that deflects and guides the air flowing out from the one end opening on one end side of the second ventilation passage 63 to the third ventilation passage 65.

[0037] The third noise reduction unit 310 includes a noise reduction pipe 66 forming a first ventilation path 61 and a noise reduction cover 67. The noise reduction pipe 66 has a straight pipe portion 68 and a tapered portion 69 that extends upwards (to one end) in the airflow direction. The tapered portion 69 is located on the upstream side (to one end) of the noise reduction pipe 66 in the airflow direction. The opening 66a at the end of the tapered portion 69 with the largest opening is connected to the other end of the electric suction cover 55, and the opening at the other end of the tapered portion 69 with the smallest opening is connected to one end of the straight pipe portion 68. The other end opening 66b of the straight pipe portion 68 opens towards the closed end 613 within the first foldback portion 62. The noise reduction cover 67 covers the outer periphery of the straight pipe portion 68.

[0038] The straight section 68 of the noise-reducing tube 66 has a ventilable structure on at least a portion of its outer peripheral surface. In this embodiment, the ventilable structure of the straight section 68 is a plurality of through holes 610 penetrating the inner and outer surfaces of the straight section 68. Alternatively, the ventilable structure of the straight section 68 may be a sound-absorbing material made of a ventilable material (e.g., polyurethane foam) covering the inner surface of the straight section 68. In this case, the straight section 68 may not have the plurality of through holes 610, and may not have the noise-reducing cover 67.

[0039] The space between the straight tube 68 and the noise reduction cover 67 becomes the expansion chamber 611. The third noise reduction section 310 is configured to reduce noise, including the drive sound (high-frequency sound) of the electric motor 36 transmitted from the electric motor 36 to the third noise reduction section 310. The high-frequency sound of the electric motor 36 passing through the cone 69 is reflected and attenuated by the conical inner surface of the cone 69, which has a smaller cross-sectional area downstream in the direction of airflow. The attenuated sound waves are introduced into the straight tube 68 and then into the expansion chamber 611 through the multiple through holes 53c of the straight tube 53a, where noise is partially reduced due to sound wave interference within the expansion chamber 611. As a result, the noise level leaking to the outside of the housing 4 is reduced. In addition, the length from one end of the cone 69 to the other end is longer than the length of the electric motor 36 in the longitudinal direction (see reference). Figure 3 In this way, by increasing the length of the cone 69, the angle of the cone 69 can also become gentler, thus improving the attenuation effect of high-frequency sounds.

[0040] A pair of spacers 71 are provided between the outer surface (front and rear sides) of the conical portion 69 of the third noise reduction section 310 and the inner surface (front and rear sides) of the main body portion 5 of the housing 4, thereby supporting the conical portion 69 with its axis approximately aligned with the central axis 32. The entire straight tube portion 68 of the third noise reduction section 310 and the other end of the conical portion 69 are covered by a cylindrical member 612. The opening at one end of the cylindrical member 612 is connected to the outer surface of the conical portion 69, and the other end has a closed end 613. Furthermore, a pair of spacers 72 are provided between the outer surface (front and rear sides) of the cylindrical member 612 near the other end in a direction intermediate from the central axis 32, and the inner surface (front and rear sides) of the main body portion 5 of the housing 4, thereby supporting the cylindrical member 612 with its axis approximately aligned with the central axis 32. Furthermore, a pair of spacers 73 are provided between the outer surface (front and rear sides) of the other end of the straight tube section 68 of the third noise reduction section 310 and the inner surface (front and rear sides) of the cylindrical component 612, thereby supporting the straight tube section 68 so that the axis of the straight tube section 68 is approximately aligned with the central axis 32. In addition, the pair of spacers 72 and the pair of spacers 73 are small plate-shaped components, so air can flow through these spacers 72, 72, 73, 73.

[0041] The first reversing section 62 is a space surrounded by the other end opening 66b of the straight pipe section 68 and the closed end 613 of the cylindrical component 612. The second ventilation passage 63 is the space between the noise reduction pipe 66 and the cylindrical component 612. A plurality of vent holes 614 are provided on one end side of the cylindrical component 612. In this embodiment, the plurality of vent holes 614 are provided on the same side (front surface side) of the cylindrical component 612 as the plurality of exhaust ports 11, but they may also be provided around the entire circumference of the cylindrical component 612. A spacer wall 615 is provided between the outer surface of the tapered portion 69, which is further from one end of the cylindrical component 612, and the housing 4. The second reversing section 64 is a space surrounded by one end side of the cylindrical component 612, the spacer wall 615, and the housing 4. The third ventilation passage 65 is the space between the cylindrical component 612 and the housing 4, which is further from the other end of the second reversing section 64. A plurality of small exhaust ports 11 are disposed near the middle between one end and the other end of the third ventilation passage 65, and the size of the exhaust ports 11 increases in stages as they move from the middle of the third ventilation passage 65 toward the other end.

[0042] Air flowing through the upstream ventilation path 61 within the third noise reduction section 310 flows into the first deflection section 62, deflects back into the first deflection section 62 and flows into the second ventilation path 63, then flows into the second deflection section 65 through multiple connecting holes 614, folds down the second deflection section 64 and flows into the third ventilation path 65, and is discharged to the outside from the third ventilation path 65 through multiple exhaust ports 11. At this time, since the size of the multiple exhaust ports 11 increases as they face the other end, air can be discharged to the outside approximately evenly from the exhaust ports 11 on one end of the third ventilation path 65 to the exhaust ports 11 on the other end.

[0043] Thus, according to the electric vacuum cleaner 1 (refer to...) Figure 3 The noise reduction is achieved through the noise reduction of the intake port side noise reduction section 24, the noise reduction of the first noise reduction section 38, the noise reduction of the second noise reduction section 39, the noise reduction of the third noise reduction section 310, and the noise reduction through the two reversing sections (first reversing section 62 and second reversing section 64) between the other end opening 66b of the third noise reduction section 310 and the exhaust port 11, thus forming a long exhaust path. The sucked-in air is discharged from the exhaust port 11 through the air supply structure with multiple parts having a noise reduction effect. Therefore, compared with the case where multiple parts including noise reduction sections and having a noise reduction effect are not provided, an electric vacuum cleaner with improved noise reduction effect and lower operating noise can be achieved. At this time, the first noise reduction section 38, the dust collection section 37, the second noise reduction section 39, the electric suction motor 36, and the third noise reduction section 310 are arranged on the same central axis 32 in the housing 4, so exhaust loss can be suppressed to a low level while maintaining suction performance.

[0044] like Figure 6 and Figure 7 As shown, in this embodiment, the through hole 51c of the first noise reduction section 38 is oblong, the through hole 53c of the second noise reduction section 39 is oblong, and the through hole 610 of the third noise reduction section 310 is lattice-shaped. However, the shape of these through holes is not particularly limited and can be elliptical, triangular, quadrilateral, or other polygonal or irregular shapes. Furthermore, the range of these through holes is not particularly limited; it can be a full circumference or a partial circumference spanning the entire length of the noise reduction tube, or a range from near one end of the noise reduction tube to near the other end, or from one end of the noise reduction tube to the other end. In this embodiment, these through holes penetrate the noise reduction tube in a direction perpendicular to the central axis 32, but the through holes can also penetrate the noise reduction tube in a direction inclined to the central axis 32.

[0045] Furthermore, preferably, the electric suction head cover 55 is mounted to the noise reduction cover 54 of the second noise reduction section 39 and the conical portion 69 of the noise reduction tube 66 of the third noise reduction section 310 via elastic members such as rubber. This reduces the transmission of vibrations from the electric suction head 36 to the noise reduction cover 54 and the conical portion 69. Additionally, preferably, the spacers 71, 72, and 73 are mounted to the inner surface of the housing 4 via elastic members such as rubber. This also reduces the transmission of vibrations from the electric suction head 36 to the housing 4.

[0046] (Second Implementation) Figure 8 This is a longitudinal sectional view showing the first and second noise reduction parts of the vacuum cleaner body according to the second embodiment. Figure 9 This is a longitudinal sectional view showing the third noise reduction section of the vacuum cleaner body according to the second embodiment. Figure 8 and Figure 9 In, with Figure 6 and Figure 7 The components in the same way are marked with the same reference numerals. The electric vacuum cleaner of the second embodiment is constructed in the same way as the electric vacuum cleaner of the first embodiment, except that sound-absorbing materials 81, 82, 91, and 92 are respectively provided on the first noise reduction section 38, the second noise reduction section 39, the third noise reduction section 310, and the first deflection section 62 of the ventilation path 35. Hereinafter, the differences between the second embodiment and the first embodiment will be mainly described.

[0047] like Figure 8 As shown, a sheet-like sound-absorbing material 81 is provided on the outside of the noise-reducing tube 51 of the first noise-reducing section 38, covering a plurality of through holes 51c. The sound-absorbing material 81 can be, for example, foamed polyurethane. In this embodiment, the sound-absorbing material 81 covers all the through holes 51c, but it may also cover a portion of the through holes 51c, or the sound-absorbing material 81 may occupy the entire expansion chamber 51d. By configuring the sound-absorbing material 81, sound waves about to enter the expansion chamber 51d are absorbed by the sound-absorbing material 81, thus further improving the sound insulation performance (noise reduction performance). Alternatively, the sound-absorbing material 81 may be configured to cover at least a portion of at least one of the outer surface and the inner surface of the noise-reducing tube 51.

[0048] On the outer surface of the straight tube portion 53a of the noise reduction tube 53 in the second noise reduction section 39, a sheet-like sound-absorbing material 82 is provided to cover a plurality of through holes 53c. In this embodiment, the sound-absorbing material 82 covers all the through holes 53c, but it may also cover a portion of the through holes 53c, or the sound-absorbing material 82 may occupy the entire expansion chamber 53d. By configuring the sound-absorbing material 82, the sound waves that are about to enter the expansion chamber 53d are absorbed by the sound-absorbing material 82, thereby further improving the sound insulation performance (noise reduction performance). In addition, the sound-absorbing material 82 may also be provided to cover at least a portion of at least one of the outer surface and the inner surface of the straight tube portion 53a.

[0049] like Figure 9 As shown, a sheet-like sound-absorbing material 91 is provided on the outer surface of the straight tube portion 68 of the noise-reducing tube 66 of the third noise-reducing section 310, covering a plurality of through holes 610. In this embodiment, the sound-absorbing material 91 covers all the through holes 610, but it may also cover a portion of the through holes 610, or the sound-absorbing material 91 may occupy the expansion chamber 611 (see reference). Figure 7 Overall. By configuring the sound-absorbing material 91, the sound waves that are about to enter the expansion chamber 611 are absorbed by the sound-absorbing material 91, thus further improving the sound insulation performance (noise reduction performance). In addition, the sound-absorbing material 91 can also be configured to cover at least a portion of at least one of the outer surface and the inner surface of the straight tube section 68.

[0050] A sound-absorbing material 92 is provided inside the first folding section 62. In this embodiment, a pad-shaped sound-absorbing material 92 is provided on the inner surface of the closed end 613 of the cylindrical component 612. By configuring the sound-absorbing material 92, a portion of the sound waves (high frequencies) from the electric suction machine 36 passing through the first ventilation passage 61 is absorbed by the sound-absorbing material 92, thus further improving the sound insulation performance (noise reduction performance). Alternatively, the sound-absorbing material 92 may also be provided on the inner surface surrounding the first folding section 62.

[0051] (Third Embodiment) The electric vacuum cleaner 1 of the first embodiment (refer to) Figure 3 In the example shown, the vacuum cleaner body 2 has a first noise reduction section 38, a second noise reduction section 39, and a third noise reduction section 310, and the suction inlet body 3 has a suction inlet side noise reduction section 24. However, one, two, three, or all four of these noise reduction sections can be replaced with a normal ventilation path (a ventilation path without multiple through holes). According to this structure, it is possible to obtain the noise reduction effect generated by extending the total length of the ventilation path 35 by providing two deflection sections (first deflection section 62 and second deflection section 64) in the ventilation path 35 further downstream in the airflow direction than the electric suction motor 36, as well as the noise reduction effect generated by the noise reduction section that is not replaced with a normal airflow path. In the second embodiment, one, two, three, or all four noise reduction sections can also be replaced with a normal ventilation path, and sound-absorbing material can be provided on the inner surface of the replaced normal ventilation path. According to this structure, it is possible to obtain the noise reduction effect brought about by the lengthening of the ventilation path 35 by the two reversing sections, the noise reduction effect brought about by the noise reduction section that is not changed to the usual air path, and the noise reduction effect brought about by the sound-absorbing material.

[0052] (Fourth Embodiment) The electric vacuum cleaner 1 of the first embodiment (refer to) Figure 3 , Figure 7In the example shown, a first deflection section 62 and a second deflection section 64 are provided in the ventilation path 35 located downstream of the electric suction unit 36 ​​in the airflow direction, but the second deflection section 64 can also be omitted. In this case, the peripheral wall of the cylinder member 612 forms part of the main body 5 of the housing 4, and the vent hole 614 of the cylinder member 612 forms the exhaust port 11, through which air is discharged to the outside. According to this structure, the noise reduction effect generated by extending the ventilation path 35 by providing the first deflection section 62 can be obtained, as well as the noise reduction effect generated by the first noise reduction section 38, the second noise reduction section 39, the third noise reduction section 310 of the vacuum cleaner body 2 and the noise reduction section 24 on the suction body side of the suction body 3. In the second embodiment, the second deflection section 64 can also be omitted. According to this structure, it is possible to obtain the noise reduction effect generated by extending the ventilation path 35 by setting the first deflection section 62, the noise reduction effect generated by the first noise reduction section 38, the second noise reduction section 39, the third noise reduction section 310 of the vacuum cleaner body 2 and the noise reduction section 24 on the suction body side of the suction body 3, and the noise reduction effect generated by the sound-absorbing material.

[0053] (Fifth Embodiment) The electric vacuum cleaner 1 of the first embodiment can also be omitted. Figure 3 , refer to Figure 7 The first reversing portion 62 and the second reversing portion 64 are provided. In this case, the cylinder component 612 is omitted, and air from the other end opening 66b is discharged from the exhaust port 11 on the other end side. At this time, even without the cylinder component 612, a portion of the air from the other end opening 66b abuts against the inner surface of the other end of the housing 4 and reverses towards one end side and is discharged from the exhaust port 11. According to this structure, the noise reduction effect brought by the first noise reduction portion 38, the second noise reduction portion 39, the third noise reduction portion 310 of the vacuum cleaner body 2 and the noise reduction portion 24 on the suction body side of the suction body 3, as well as the noise reduction effect brought by the sound-absorbing material, can be obtained. In the second embodiment, the first reversing portion 62 and the second reversing portion 64 may also be omitted. According to this structure, the noise reduction effect brought by the first noise reduction portion 38, the second noise reduction portion 39, the third noise reduction portion 310 of the vacuum cleaner body 2 and the noise reduction portion 24 on the suction body side of the suction body 3, as well as the noise reduction effect brought by the sound-absorbing material, can be obtained.

[0054] (Sixth Embodiment) In the first embodiment, an electric vacuum cleaner 1 (see reference) is exemplified. Figure 1 In the case where the battery 8 is detachably mounted on the battery mounting portion 6 at the lower end 9a (one end 9a) of the vacuum cleaner body 2, the battery 8 can be either fixed to the battery mounting portion 6, detachably mounted to the circuit board storage portion 7, or stored within the circuit board storage portion 7. The housing 4 of the vacuum cleaner body 2 has an air intake 33 on the end face of the body portion 5 at one end 9a. The second embodiment is similar.

[0055] (Seventh Embodiment) In the first embodiment, an electric vacuum cleaner 1 is exemplified (see Figure 1 The handle 10 is ring-shaped, but it can also be a straight rod or a partially curved rod. Other configurations are the same as in the second embodiment.

Claims

1. An electric vacuum cleaner, characterized in that, include: The housing has an air intake and an exhaust port; a ventilation path that allows air from the air intake to flow to the exhaust port; an electric air intake motor disposed in the ventilation path; a dust collection unit disposed in the ventilation path upstream of the electric air intake motor in the airflow direction; and a noise reduction unit that forms part of the ventilation path upstream of the dust collection unit in the airflow direction and reduces noise including airflow sound, the noise reduction unit being disposed within the housing.

2. The electric vacuum cleaner according to claim 1, characterized in that, The air intake is located at one end of the housing along its central axis, and the air exhaust is located at the other end of the housing along its central axis. The ventilation path includes: a first ventilation path connected to the other end of the electric suction machine; a second ventilation path surrounding the outer side of the first ventilation path; a third ventilation path surrounding the outer side of the second ventilation path; a first deflection section that deflects air flowing out from the other end opening of the first ventilation path and directs it to the second ventilation path; and a second deflection section that deflects air flowing out from the one end opening of the second ventilation path and directs it to the third ventilation path.

3. The electric vacuum cleaner according to claim 1 or 2, characterized in that, The electric vacuum cleaner also includes: a ring-shaped handle located on the other end of the housing; and an operating unit located on the other end of the housing, for switching the drive and stop of the electric suction motor.

4. The electric vacuum cleaner according to claim 3, characterized in that, The operating part is located on the other end face of the housing, which is perpendicular to the central axis of the housing.

5. The electric vacuum cleaner according to claim 3, characterized in that, The operating part is located in the non-grip portion of the handle.

6. The electric vacuum cleaner according to claim 1 or 2, characterized in that, It also has a battery that provides power to the electric inhaler. The battery is disposed on the outer surface of the housing near the air intake.

7. The electric vacuum cleaner according to claim 1 or 2, characterized in that, It also has a battery that provides power to the electric inhaler. The battery is disposed on the outer surface of the housing near the noise reduction section.

8. The electric vacuum cleaner according to claim 1 or 2, characterized in that, It also has an accessory that can be detachably installed at the air intake.

9. The electric vacuum cleaner according to claim 1 or 2, characterized in that, The noise reduction unit has a noise reduction tube, and at least a portion of the outer peripheral surface of the noise reduction tube has a ventilable structure.

10. The electric vacuum cleaner according to claim 9, characterized in that, The ventilated structure consists of multiple through holes that penetrate the inner and outer surfaces of the noise reduction tube.

11. The electric vacuum cleaner according to claim 9, characterized in that, The noise reduction section has a sound-absorbing material that covers at least a portion of at least one of the outer surface and the inner surface of the noise reduction tube.

12. The electric vacuum cleaner according to claim 9, characterized in that, The noise reduction unit has a noise reduction cover that covers the outer periphery of the noise reduction tube.

13. An electric vacuum cleaner, characterized in that, include: The housing has an air intake and an air exhaust port; A ventilation path that directs air from the intake port to the exhaust port; an electric air intake motor disposed in the ventilation path; and a dust collection unit disposed in the ventilation path upstream of the electric air intake motor in the airflow direction. The air intake is located at one end of the housing along its central axis, and the air exhaust is located at the other end of the housing along its central axis. The ventilation path includes: a first ventilation path connected to the other end of the electric suction machine; a second ventilation path surrounding the outer side of the first ventilation path; a third ventilation path surrounding the outer side of the second ventilation path; a first deflection section that deflects air flowing out from the other end opening of the first ventilation path and directs it to the second ventilation path; and a second deflection section that deflects air flowing out from the one end opening of the second ventilation path and directs it to the third ventilation path.

14. An electric vacuum cleaner, characterized in that, The vacuum cleaner body includes: a housing having an air intake and an exhaust port; a ventilation path that allows air from the air intake to flow to the exhaust port; an electric motor disposed in the ventilation path; a dust collection unit disposed in the ventilation path upstream of the electric motor in the airflow direction; a first noise reduction unit that forms a portion of the ventilation path upstream of the airflow direction relative to the dust collection unit and reduces noise including airflow sound; a second noise reduction unit that forms a portion of the ventilation path between the dust collection unit and the electric motor and reduces noise including the driving sound of the electric motor; and a third noise reduction unit that forms a portion of the ventilation path downstream of the airflow direction relative to the electric motor and reduces noise including the driving sound of the electric motor.

15. The electric vacuum cleaner according to claim 14, characterized in that, It also includes an accessory that can be detachably installed on the air intake of the vacuum cleaner body.

Images