Portable vacuum cleaner equipped with sound-absorbing walls

Abstract

The portable suction cleaner (2) comprises a main body (3) equipped with a suction duct (6) and a suction motor (5) housed in the main body (3) and configured to generate an air flow through the suction duct (6), the main body (3) comprising an air discharge circuit (18) through which the air flow generated by the suction motor (5) is discharged towards the outside of the main body (3). The air discharge circuit (18) comprises a filter (19) having a substantially cylindrical shape and delimiting an inner chamber fluidically connected to an air delivery hole of the suction motor (5), and an acoustic wall (23) extending at least partially into the inner chamber of the filter (19), the inner surface of the filter (19) and the acoustic wall (23) delimiting a first air flow duct and a second air flow duct in which a portion of the air flow flows.

Description

Technical Field

[0001] This invention relates to the field of vacuum cleaners that allow the suction of dust and waste present on a surface to be cleaned, such as a tile floor, parquet floor, laminate floor, mat, or carpet. Background Technology

[0002] A vacuum cleaner, more specifically, a portable vacuum cleaner, comprises, in a known manner: a body equipped with a suction duct, a waste separation and collection device mounted on the body, and a suction motor housed within the body, the suction motor having a motor shaft and configured to generate an airflow through the suction duct and the waste separation and collection device. The body also includes an air exhaust circuit through which the airflow generated by the suction motor is discharged toward the outside of the body. Advantageously, the air exhaust circuit is equipped with a filter configured to filter the airflow flowing through the air exhaust circuit.

[0003] However, the noise generated when such a portable vacuum cleaner is in operation may prove to be significant, which could make its use unpleasant. Summary of the Invention

[0004] The present invention aims to overcome all or some of these disadvantages.

[0005] The technical problem upon which this invention is based is particularly to provide a portable vacuum cleaner that is simple and economical in structure, while significantly reducing the noise generated by the portable vacuum cleaner during its use.

[0006] Therefore, the present invention relates to a portable vacuum cleaner comprising: a main body equipped with a suction duct, a waste separation and collection device mounted on the main body, and a suction motor disposed in the main body, the suction motor having a motor shaft and configured to generate an airflow through the suction duct and the waste separation and collection device, the main body further comprising an air exhaust circuit through which the airflow generated by the suction motor is discharged toward the outside of the main body, the air exhaust circuit being equipped with a filter configured to filter the airflow flowing through the air exhaust circuit.

[0007] The filter has a generally cylindrical shape and includes an inner surface defining an inner chamber that is fluidly connected to an air delivery port of an intake motor, and an air exhaust circuit including a sound-absorbing wall that extends at least partially into the inner chamber of the filter. The inner surface of the filter and the sound-absorbing wall define a first airflow duct and a second airflow duct in which a portion of the airflow flows.

[0008] A filter with a generally cylindrical shape can be understood as having an approximately truncated conical shape, or an approximately cylindrical shape with a C-shaped cross section or a horseshoe-shaped cross section. The inner chamber itself also adopts an approximately cylindrical shape.

[0009] The specific construction of the filter according to the invention, combined with the presence of a sound-absorbing wall housed within the filter's inner chamber, allows for a reduction in noise generated by the portable vacuum cleaner while simultaneously producing low pressure loss. In fact, the fact that the filter's inner chamber is divided into two parts allows for a significant reduction in the amplitude of sound waves passing through the filter's inner chamber. The amplitude of the sound waves is typically divided by 2. This reduction in sound amplitude significantly reduces the sound emissions from the airflow passing through the filter. Therefore, this construction of the portable vacuum cleaner makes its use more pleasant without significantly compromising its suction performance.

[0010] Vacuum cleaner nozzles may also have one or more of the following features, which may be used alone or in combination.

[0011] According to one embodiment of the invention, the sound-absorbing wall extends over at least a portion of the length of the filter, and for example, over the entire length of the filter or only a portion of the length of the filter.

[0012] According to one embodiment of the present invention, the inner chamber has a circular cross-section.

[0013] According to one embodiment of the invention, the first and second airflow pipes are separated from each other by a sound-absorbing wall.

[0014] According to one embodiment of the invention, the sound-absorbing wall is configured such that the first and second airflow ducts have substantially the same, and for example, generally semi-cylindrical, channel cross-section.

[0015] According to one embodiment of the invention, the filter has a longitudinal axis at its center.

[0016] Advantageously, the air exhaust circuit includes a single sound-absorbing wall arranged and centered on the longitudinal axis of the filter, such that the sound-absorbing wall divides the inner chamber into two substantially identical airflow channels. The use of a single sound-absorbing wall advantageously centered on the longitudinal axis of the generally cylindrical filter allows for two airflow channels with substantially identical channel cross-sections. Therefore, the pressure loss caused by the airflow in both airflow channels, as well as the amplitude and frequency of the sound waves passing through the airflow channels, are substantially the same. This allows for further optimization of sound absorption in the construction according to the invention, where the sound-absorbing wall is arranged in the inner chamber of the generally cylindrical filter. Conversely, eccentric sound-absorbing walls within the inner chamber or multiple sound-absorbing walls arranged in parallel within the inner chamber do not allow for optimal results because the channel cross-sections differ in terms of surface area or cross-sectional shape.

[0017] According to one embodiment of the invention, the inner chamber includes a first open end and a second closed end opposite to the first open end, the first open end of the inner chamber being oriented toward the suction motor. This configuration of the inner chamber equipped with a sound-absorbing wall allows for further reduction of noise generated by the portable vacuum cleaner.

[0018] According to one embodiment of the present invention, the sound-absorbing wall includes a first end and a second end opposite to the first end, the first end of the sound-absorbing wall being substantially axially located at or protruding from the first open end of the inner chamber to the outside of the inner chamber.

[0019] According to one embodiment of the invention, the sound-absorbing wall is elongated and extends along an extension direction. Advantageously, this extension direction is substantially parallel to the longitudinal axis of the filter.

[0020] According to one embodiment of the invention, the sound-absorbing wall extends along the longitudinal axis of the filter.

[0021] According to one embodiment of the invention, the sound-absorbing wall has a generally planar shape and extends within an extending plane. This construction of the sound-absorbing wall allows for further limitation of pressure loss caused by the sound-absorbing wall.

[0022] According to one embodiment of the invention, the sound-absorbing wall includes the longitudinal axis of the filter. Advantageously, the sound-absorbing wall symmetrically separates the inner chamber such that the first and second airflow ducts are substantially identical.

[0023] According to one embodiment of the invention, the longitudinal axis of the filter is substantially coaxial with the motor axis of the suction motor.

[0024] According to one embodiment of the invention, the extending plane of the sound-absorbing wall is substantially parallel to the longitudinal axis of the filter. This arrangement of the sound-absorbing wall allows for further limitation of the pressure loss caused by the sound-absorbing wall. Advantageously, the extending plane of the sound-absorbing wall is substantially parallel to the motor axis of the suction motor.

[0025] According to one embodiment of the invention, the first and second airflow ducts extend substantially parallel to the longitudinal axis of the filter. Advantageously, the first and second airflow ducts extend substantially parallel to the motor axis of the intake motor.

[0026] In an embodiment different from the above, the longitudinal axis of the filter is parallel to and separate from the motor axis of the suction motor.

[0027] In an embodiment different from the above, the longitudinal axis of the filter is inclined relative to the motor axis of the suction motor.

[0028] According to one embodiment of the invention, the motor axis of the suction motor intersects with the sound-absorbing wall. This arrangement of the sound-absorbing wall allows for further reduction of noise generated by the portable vacuum cleaner.

[0029] According to one embodiment of the invention, the sound-absorbing wall includes a supporting structural element and a sound-absorbing member made of a porous material and fixed to the supporting structural element. The sound-absorbing member can be fixed to the supporting structural element, for example, by gluing or by any other fixing means. This construction of the sound-absorbing wall allows for easy fixing and retention in place within the interior chamber. Furthermore, the structural element restricts deformation of the sound-absorbing wall and prevents vibration of the wall when airflow occurs within the interior chamber.

[0030] According to one embodiment of the present invention, the sound-absorbing component is made of a porous material having multiple open cavities.

[0031] According to one embodiment of the present invention, the supporting structural element is a supporting structural core.

[0032] According to one embodiment of the invention, the support structural element is perforated. This configuration of the support structural element allows for limiting pressure loss generated by the sound-absorbing wall.

[0033] According to one embodiment of the invention, the sound-absorbing member is fixed to a supporting structural element such that airflow should pass over the sound-absorbing member before encountering the supporting structural element. In other words, the sound-absorbing member is fixed to the supporting structural element such that airflow cannot directly encounter the supporting structural element.

[0034] According to one embodiment of the invention, the sound-absorbing member includes a first sound-absorbing portion and a second sound-absorbing portion, each having a generally planar shape and extending substantially parallel to each other; and a third sound-absorbing portion interconnecting the first and second sound-absorbing portions, with a support structural element disposed between the first and second sound-absorbing portions. Advantageously, the third sound-absorbing portion is oriented toward the intake motor.

[0035] According to one embodiment of the invention, the sound-absorbing member itself is folded to form the first and second sound-absorbing portions.

[0036] According to one embodiment of the present invention, the sound-absorbing component is acoustic foam.

[0037] According to one embodiment of the present invention, the supporting structural element is rigid.

[0038] According to one embodiment of the present invention, the supporting structural element is a supporting frame.

[0039] According to another embodiment of the present invention, the supporting structural element is a supporting plate having a plurality of through holes distributed on the supporting plate.

[0040] According to one embodiment of the invention, the air exhaust circuit includes at least one air exhaust opening disposed on the body, through which airflow generated by the suction motor is exhausted to the outside of the household vacuum cleaner. The at least one air exhaust opening is oriented in a direction that extends substantially perpendicular to the sound-absorbing wall. This configuration allows for optimization of the pneumatic path between the filter inlet and the air exhaust opening disposed on the body. More specifically, this configuration allows for limiting pressure loss between the filter inlet and the air exhaust opening and allows for further improvement in the sound attenuation performance of the filter. Advantageously, at least two air exhaust openings are disposed on the body. These two air exhaust openings are arranged such that one air exhaust opening is formed on each side of the body of the sound-absorbing wall.

[0041] According to one embodiment of the invention, at least one air exhaust opening leads to the upper outer surface of the body.

[0042] According to one embodiment of the present invention, the inhalation catheter is disposed in the front part of the main body.

[0043] According to one embodiment of the invention, the filter is located at the rear of the suction motor.

[0044] According to one embodiment of the invention, the air exhaust circuit further includes an additional sound-absorbing element made of a porous material and located upstream of the filter. The additional sound-absorbing element includes a channel opening fluidly connected to an air pressure port of the intake motor and located opposite a first open end of the filter's inner chamber.

[0045] According to one embodiment of the invention, the sound-absorbing wall extends partially into the channel opening.

[0046] According to another embodiment of the invention, the first end of the sound-absorbing wall may be retracted from the channel opening and therefore does not extend through the channel opening.

[0047] According to one embodiment of the invention, the additional sound-absorbing element is made of a porous material having multiple open cavities.

[0048] According to one embodiment of the present invention, the additional sound-absorbing element is acoustic foam.

[0049] According to one embodiment of the invention, an additional sound-absorbing element is located between the intake motor and the filter.

[0050] According to one embodiment of the invention, the additional sound-absorbing element has an annular shape.

[0051] According to one embodiment of the present invention, the filter includes a first axial end face and a second axial end face opposite to the first axial end face, and an additional sound-absorbing element at least partially covers the first axial end face of the filter.

[0052] According to one embodiment of the invention, the additional sound-absorbing element includes a first axial surface and a second axial surface, the first axial surface being annular and oriented toward the intake motor, and the second axial surface being annular and oriented toward the filter. Advantageously, the second axial surface of the additional sound-absorbing element contacts the first axial end face of the filter.

[0053] According to one embodiment of the invention, the filter includes a filter portion made of a pleated filter medium having a generally tubular shape. In one embodiment variation, the filter portion may be made of tubular foam. This configuration of the filter further improves the sound attenuation performance of the filter and thus further reduces the noise generated by the portable vacuum cleaner.

[0054] According to one embodiment of the invention, the main body at least partially defines the storage chamber, in which the filter and sound-absorbing wall are removably stored.

[0055] According to one embodiment of the invention, a portable vacuum cleaner includes a removable cover removably attached to a body. The removable cover is configured to prevent access to a filter and a sound-absorbing wall when attached to the body, and to allow access to the filter and the sound-absorbing wall when the removable cover is removed. These configurations allow easy access to the filter and the sound-absorbing wall, and allow them to be removed from the body for maintenance, and in particular for cleaning and / or replacement.

[0056] According to one embodiment of the present invention, a removable cover is disposed on the back of the main body of the portable vacuum cleaner.

[0057] According to one embodiment of the invention, a portable vacuum cleaner includes at least one energy storage element, such as a rechargeable battery, configured to supply power to the portable vacuum cleaner, particularly the suction motor.

[0058] According to one embodiment of the invention, at least one energy storage element is housed in the body, and for example, in a grip handle disposed on the body.

[0059] According to one embodiment of the present invention, the waste separation and collection device is a cyclone type.

[0060] According to one embodiment of the invention, the waste separation and collection device extends along an extension axis transverse to the motor axis of the suction motor. Advantageously, the extension axis of the waste separation and collection device is substantially perpendicular to the motor axis.

[0061] According to one embodiment of the invention, the waste separation and collection device is removably mounted on the main body.

[0062] According to an embodiment of the present invention, a portable vacuum cleaner has a support structure disposed in a main body and configured to support a filter. The support structure includes, for example, a perforated support portion of a generally tubular shape, around which the filter is mounted, the perforated support portion being configured to support the filter and extending between the sound-absorbing wall and the filter.

[0063] According to the embodiment shown in the figure, the support structure is also configured to support additional sound-absorbing elements. Attached Figure Description

[0064] In any case, the invention will be better understood with reference to the following illustrative drawings, which illustrate two embodiments of the vacuum cleaner by way of non-limiting examples.

[0065] Figure 1 This is a longitudinal sectional view of a portable vacuum cleaner according to the present invention.

[0066] Figure 2 yes Figure 1 Portable vacuum cleaner along the perpendicular Figure 1 A partial longitudinal sectional view of the cross-sectional plane.

[0067] Figure 3 yes Figure 1 A magnified view of the details.

[0068] Figure 4 yes Figure 1 A cross-sectional view of a portable vacuum cleaner. Detailed Implementation

[0069] In this document, the terms "upstream" and "downstream" are defined relative to the direction of airflow within the portable vacuum cleaner.

[0070] Figures 1 to 4 A portable vacuum cleaner 2 is shown, which includes a main body 3, a waste separation and collection device 4 removably mounted on the main body 3, and a suction motor 5 housed in the main body 3.

[0071] The main body 3 specifically includes an intake duct 6 and a grip handle 7, through which outside air can be drawn in by the portable vacuum cleaner 2, and the grip handle 7 allows the portable vacuum cleaner 2 to be gripped by the user. Advantageously, the intake duct 6 is located in the front of the main body 3, and the grip handle 7 is located in the rear of the main body 3.

[0072] According to the embodiment shown in the figure, the waste separation and collection device 4 includes a waste collection container 8, which has generally tubular sidewalls. The waste separation and collection device 4 is advantageously cyclone-type and further includes: a tubular separation member 9, such as a tubular grid, configured to be coaxial with the central axis of the waste collection container 8; and a cyclone separation chamber 10, externally defined by the sidewalls of the waste collection container 8 and internally defined by the tubular separation member 9. The waste separation and collection device 4 also includes an air inlet opening 11, which is fluidly connected to a suction conduit 6 and opens into the cyclone separation chamber 10.

[0073] The suction motor 5 is more specifically configured to generate an airflow through the suction duct 6 and the waste separation and collection device 4.

[0074] like Figure 1 As shown, the intake motor 5 includes a motor housing 12 and an electric ventilator 13 disposed within the motor housing 12. In a known manner, the electric ventilator 13 includes a ventilator and an electric motor configured to drive the ventilator to rotate.

[0075] The suction motor 5 also includes an air inlet 14 and an air pressure outlet 15, and the portable vacuum cleaner 2 also includes a connecting pipe 16 that fluidly connects the air inlet 14 of the suction motor 5 to the air outlet of the waste separation and collection device 4.

[0076] According to the embodiment shown in the figure, the waste separation and collection device 4 extends along the extension axis A, and the suction motor 5 includes a motor axis B that extends transversely to the extension axis A and advantageously perpendicularly to the extension axis A.

[0077] The portable vacuum cleaner 2 also includes an energy storage element 17, such as a rechargeable battery, configured to power the electric ventilator 13. The energy storage element 17 is advantageously housed in the body 3 and, for example, in the grip handle 7.

[0078] The main body 3 also includes an air discharge circuit 18 through which the airflow generated by the intake motor 5 is discharged toward the outside of the main body 3.

[0079] The air exhaust circuit 18 includes a filter 19 configured to filter the airflow passing through the air exhaust circuit 18. The filter 19 has a generally cylindrical shape and a longitudinal axis extending substantially coaxially with the motor axis B at its center. Advantageously, the filter 19 is located at the rear of the intake motor 5.

[0080] The filter 19 includes a first axial end face 19.1 and a second axial end face 19.2 opposite to the first axial end face 19.1, and also includes a filter portion 21 made of a pleated filter medium having a generally tubular shape.

[0081] The filter section 21 includes an inner surface defining an inner chamber 22, which is fluidly connected to an air pressure port 15 of the intake motor 5. Advantageously, the inner chamber 22 has a circular cross-section and includes a first open end 22.1 oriented toward the intake motor 5 and a second closed end 22.2 opposite to and downstream of the first open end 22.1.

[0082] The air exhaust circuit 18 also includes a sound-absorbing wall 23 that extends at least partially into the inner chamber 22 of the filter 19, such that the inner surface of the filter 19 and the sound-absorbing wall 23 define a first airflow duct 24.1 and a second airflow duct 24.2, in which a portion of the airflow flows.

[0083] Advantageously, the sound-absorbing wall 23 is elongated and extends in a direction substantially parallel to the longitudinal axis of the filter 19. The sound-absorbing wall 23 may extend, for example, over the entire length of the filter 19, or over only a portion of the length of the filter 19.

[0084] According to the embodiment shown in the figure, the first and second airflow pipes 24.1, 24.2 are separated from each other by a sound-absorbing wall 23, and the sound-absorbing wall 23 is configured such that the first and second airflow pipes 24.1, 24.2 have substantially the same, and for example, generally semi-cylindrical, channel cross-section.

[0085] According to the embodiment shown in the figure, the sound-absorbing wall 23 has a generally planar shape and extends in an extending plane substantially parallel to the longitudinal axis of the filter 19. Advantageously, the sound-absorbing wall 23 includes the longitudinal axis of the filter 19, and the first and second airflow pipes 24.1, 24.2 extend substantially parallel to the longitudinal axis of the filter 19. Advantageously, the longitudinal axis of the filter 19 is located in the intermediate plane of the sound-absorbing wall.

[0086] The sound-absorbing wall 23 includes a first end 23.1 located on the side of the intake motor 5 and a second end 23.2 opposite to the first end 22.1. According to the embodiment shown in the figure, the first end 23.1 of the sound-absorbing wall 23 protrudes from the first open end 22.1 of the inner chamber 22 to the outside of the inner chamber 22. However, according to a variation of the invention, the first end 23.1 of the sound-absorbing wall 23 may be axially located substantially at the first open end 22.1 of the inner chamber 22, or may be recessed from the first open end 22.1 of the inner chamber 22.

[0087] According to the embodiment shown in the figure, the sound-absorbing wall 23 includes a support structural element 24 and a sound-absorbing member 25, the support structural element 24 being advantageously rigid and perforated, and the sound-absorbing member 25 being made of a porous material and fixed to the support structural element 24, for example by adhesive or any other fixing means.

[0088] The supporting structural element 24 may be formed, for example, by a supporting frame or by a supporting plate having a plurality of through holes distributed on the plate. Advantageously, the sound-absorbing member 25 is acoustic foam having a thickness between 3 mm and 7 mm, and for example, about 5 mm.

[0089] According to the embodiment shown in the figure, the sound-absorbing member 25 includes a first sound-absorbing portion 25.1 and a second sound-absorbing portion 25.2, each having a generally planar shape and extending substantially parallel to each other; and a third sound-absorbing portion 25.3, which interconnects the first and second sound-absorbing portions 25.1 and 25.2. This configuration of the sound-absorbing member 25 is obtained by folding the sound-absorbing member 25 itself.

[0090] The support structural element 24 is disposed between the first and second sound-absorbing portions 25.1, 25.2 and thus forms the support structural core. Advantageously, the third sound-absorbing portion 25.3 is oriented toward the intake motor 5 such that the airflow should pass over the sound-absorbing member 25 before it can encounter the support structural element 24. In other words, the sound-absorbing wall 23 is configured such that the airflow cannot directly encounter the support structural element 24.

[0091] The air exhaust circuit 18 also includes an additional sound-absorbing element 26 made of porous material and located upstream of the filter 19. Advantageously, the additional sound-absorbing element 26 is located between the intake motor 5 and the filter 19. The additional sound-absorbing element 26 can be, for example, acoustic foam.

[0092] According to the embodiment shown in the figure, the additional sound-absorbing element 26 has an annular shape and includes a channel opening 27 that is fluidly connected to the air pressure delivery port 15 of the intake motor 5 and is opposite to the first open end 22.1 of the inner chamber 22 of the filter 19.

[0093] The additional sound-absorbing element 26 includes a first axial surface 26.1 and a second axial surface 26.2. The first axial surface 26.1 is annular and oriented toward the intake motor 5, and the second axial surface 26.2 is annular and oriented toward the filter 19.

[0094] According to the embodiment shown in the figure, the portable vacuum cleaner 2 includes a support structure 30 disposed within the main body 3 and configured to support the filter 19 and additional sound-absorbing elements 26. More specifically, the support structure 30 includes:

[0095] - A perforated support portion 30.1 of generally tubular shape, around which the filter 19 is mounted, the perforated support portion 30.1 being configured to support the filter 19 and extending between the sound-absorbing wall 23 and the filter 19;

[0096] - An additional support portion 30.2, generally tubular in shape, surrounding the additional sound-absorbing element 26, the additional support portion 30.2 being configured to support the additional sound-absorbing element 26; and

[0097] A support portion 30.3 connects the perforated support portion 30.1 to the additional support portion 30.2 and is inserted between the filter 19 and the additional sound-absorbing element 26. The support portion 30.3 includes a first surface and a second surface oriented toward the filter 19, with the second axial surface 26.2 of the additional sound-absorbing element 26 abutting against the first surface. The filter 19 may, for example, abut against the second surface of the support portion 30.3.

[0098] The support structure 30 may also have an end wall 30.4 located opposite the second closed end 22.2 of the inner chamber 22.

[0099] However, according to a variation of the invention, the second axial surface 26.2 of the additional sound-absorbing element 26 may contact the first axial end face 19.1 of the filter 19, and the additional sound-absorbing element 26 may at least partially and, for example, completely cover the first axial end face 19.1 of the filter 19.

[0100] According to the embodiment shown in the figure, the sound-absorbing wall 23 extends partially into the channel opening 27. However, according to a variation of the invention, the first end 23.1 of the sound-absorbing wall 23 may be recessed from the channel opening 27 and therefore does not extend through the channel opening 27.

[0101] The air exhaust circuit 18 also includes a plurality of air exhaust openings 28 disposed on the outer surface of the main body 3, through which the airflow generated by the intake motor 5 is discharged toward the outside of the main body 3.

[0102] Advantageously, at least one of the plurality of air exhaust openings 28 and each is oriented, for example, along a directional direction that extends substantially perpendicular to the sound-absorbing wall 23.

[0103] According to the embodiment shown in the figure, the main body 3 at least partially defines a storage chamber 29, in which the filter 19 and the sound-absorbing wall 23 are removably stored. The portable vacuum cleaner 2 includes a removable cover 31, which is removably fixed to the main body 3. The removable cover 31 is configured to prevent access to the filter 19 and the sound-absorbing wall 23 when fixed to the main body 3 and to allow access to the filter 19 and the sound-absorbing wall 23 when the removable cover 31 is removed. Advantageously, the removable cover 31 is located on the back of the main body 3 of the portable vacuum cleaner 2.

[0104] The operation of the vacuum cleaner 2 will now be described. When the electric ventilator 13 is powered on, it creates a negative pressure, particularly in the waste collection and separation device 4, causing air and waste to be drawn in through the suction duct 6. The air carrying the waste then enters the waste collection container 8 through the air inlet 11, which may, for example, be tangentially directed to the cyclone separation chamber 10. Thus, the air rotates, and the waste is centrifugally dispersed outwards, and this waste is collected by the waste collection container 8.

[0105] Then, the airflow flows sequentially through the air outlet 11, the connecting pipe 16, and the air inlet 14 and air pressure delivery 15 of the intake motor 5. Then, the airflow flows through the channel opening 27 of the additional sound-absorbing element 26 and the first and second airflow pipes 24.1 and 24.2, then through the filter section 21, and then escapes from the main body 3 through the air outlet 28.

[0106] Of course, the present invention is by no means limited to the embodiments described and shown only by way of example. Modifications can be made without departing from the scope of protection of the present invention, particularly from the viewpoint of the construction of various elements or by substituting technical equivalents.

Claims

1. A portable vacuum cleaner (2), comprising: The body (3) is equipped with an inhalation duct (6), a waste separation and collection device (4) mounted on the body (3), and an inhalation motor (5) housed in the body (3). The inhalation motor (5) has a motor shaft (B) and is configured to generate an airflow through the inhalation duct (6) and the waste separation and collection device (4). The body (3) also includes an air exhaust circuit (18) through which the airflow generated by the inhalation motor (5) is discharged toward the outside of the body (3). The air exhaust circuit (18) is equipped with a filter (19) configured to filter the airflow passing through the air exhaust circuit (18). 8) an airflow characterized in that the filter (19) has a generally cylindrical shape and includes an inner surface defining an inner chamber (22) fluidly connected to an air pressure port (15) of the intake motor (5), and the air discharge circuit (18) includes a sound-absorbing wall (23) that extends at least partially into the inner chamber (22) of the filter (19), the inner surface of the filter (19) and the sound-absorbing wall (23) defining a first airflow duct (24.1) and a second airflow duct (24.2), a portion of the airflow flowing in the first airflow duct (24.1) and the second airflow duct (24.2).

2. The portable vacuum cleaner (2) according to claim 1, wherein, The inner chamber (22) includes a first open end (22.1) and a second closed end (22.2) opposite to the first open end (22.1), with the first open end (22.1) of the inner chamber (22) oriented toward the suction motor (5).

3. The portable vacuum cleaner (2) according to claim 2, wherein, The sound-absorbing wall (23) includes a first end (23.1) and a second end (23.2) opposite to the first end (23.1), the first end (23.1) of the sound-absorbing wall (23) being substantially axially located at or protruding from the first open end (22.1) of the inner chamber (22) to the outside of the inner chamber (22).

4. The portable vacuum cleaner (2) according to claim 2 or 3, wherein, The air exhaust circuit (18) also includes an additional sound-absorbing element (26) made of porous material and located upstream of the filter (19). The additional sound-absorbing element (26) includes a channel opening (27) that is fluidly connected to the air pressure port (15) of the intake motor (5) and is located opposite the first open end (22.1) of the inner chamber (22) of the filter (19).

5. The portable vacuum cleaner (2) according to claim 4, wherein, The sound-absorbing wall (23) extends partially into the channel opening (27).

6. The portable vacuum cleaner (2) according to claim 4, wherein, The additional sound-absorbing element (26) is acoustic foam.

7. The portable vacuum cleaner (2) according to any one of claims 1 to 3, wherein, The sound-absorbing wall (23) has a generally planar shape and extends in an extended plane.

8. The portable vacuum cleaner (2) according to claim 7, wherein, The filter (19) has a longitudinal axis at its center, and the extended plane of the sound-absorbing wall (23) is substantially parallel to the longitudinal axis of the filter (19).

9. The portable vacuum cleaner (2) according to claim 8, wherein, The longitudinal axis of the filter (19) extends substantially coaxially with the motor axis (B) of the suction motor (5).

10. The portable vacuum cleaner (2) according to any one of claims 1 to 3, wherein, The motor axis (B) of the suction motor (5) intersects with the sound-absorbing wall (23).

11. The portable vacuum cleaner (2) according to any one of claims 1 to 3, wherein, The sound-absorbing wall (23) includes a supporting structural element (24) and a sound-absorbing component (25), the sound-absorbing component (25) being made of a porous material and fixed to the supporting structural element (24).

12. The portable vacuum cleaner (2) according to claim 11, wherein, The supporting structural element (24) is perforated.

13. The portable vacuum cleaner (2) according to claim 11, wherein, The sound-absorbing component (25) includes a first sound-absorbing portion (25.1) and a second sound-absorbing portion (25.2), each having a generally planar shape and extending substantially parallel to each other; and a third sound-absorbing portion (25.3) that interconnects the first sound-absorbing portion (25.1) and the second sound-absorbing portion (25.2), and the support structural element (24) is disposed between the first sound-absorbing portion (25.1) and the second sound-absorbing portion (25.2).

14. The portable vacuum cleaner (2) according to any one of claims 1 to 3, wherein, The air exhaust circuit (18) includes at least one air exhaust opening (28) disposed on the main body (3), through which the airflow generated by the suction motor (5) is discharged to the outside of the portable vacuum cleaner (2), and the at least one air exhaust opening (28) is oriented in a direction that is substantially perpendicular to the sound-absorbing wall (23).

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