摘要：
A compact motor housing for housing a motor and a blower of a cleaning device and with integrated air outlet silencing. The motor housing encloses a flow passage between a flow inlet and outlet. The housing has a blower chamber fluidically connected to the flow inlet, and via first and second outlet openings also fluidically connected to at least two parallel, preferably similar, silencer ducts each being arranged in an area limited by an angle of less than 90°, seen in a view parallel with the blower and motor axis. The silencer ducts each have at least one wall between the blower chamber and the external wall of the motor housing for causing at least one flow direction bend, so as to provide a noise attenuating effect. The areas occupied by the at least two silencer ducts are non-overlapping, seen in a view parallel with the blower and motor axis. With a circular blower chamber, a compact box shaped motor housing can be provided with corner volumes available for silencer ducts.
权利要求：
1. A motor housing for housing a motor (M) and a blower (BL) of a cleaning device, the motor housing comprising an external wall (XW) for enclosing the blower (BL) arranged to rotate around an axis (x), the motor (M) for driving the blower (BL), and a flow passage between an externally accessible flow inlet (E_I) and an externally accessible flow outlet (S_O1, S_O2, S_O3, S_O4), wherein the flow passage comprises, seen in a view parallel with said axis (x): - a blower chamber (BC) for housing the blower (BL), wherein the blower chamber (BC) has an opening fluidically connected to the externally accessible flow inlet (E_I), wherein the blower chamber further has separate first and second outlet openings (O1, O2) characterized in that the flow passage further comprises, seen in a view parallel with said axis (x): - a first silencer duct (SD1) fluidically connected to the first outlet opening (O1) of the blower chamber (BC), wherein the first silencer duct (SD1) is arranged in a first area limited by a first angle (A1) of less than 90° from the axis (x), wherein at least one wall (W1) between the blower chamber (BC) and the external wall (XW) of the motor housing serves to cause at least one flow direction bend, and wherein the first silencer duct (SD1) has a first outlet opening (S_O1), and - a second silencer duct (SD2) fluidically connected to the second outlet opening (O2) of the blower chamber (BC), wherein the second silencer duct (SD2) is arranged in a second area limited by a second angle (A1) of less than 90° from the axis, wherein at least one wall (W2) between the blower chamber (BC) and the external wall (XW) of the motor housing serves to cause at least one flow direction bend, and wherein the second silencer duct (SD2) has a second outlet opening (S_O2), wherein the first and second areas are non-overlapping.
2. The motor housing according to claim 1, comprising a third silencer duct (DS3) fluidically connected to a third outlet opening (03) of the blower chamber (BC), wherein the third silencer duct (SD3) is arranged in a third area limited by a third angle of less than 90° from the axis and non-overlapping with the first and second areas, wherein the third silencer duct (SD3) has a third outlet opening (S_O3).
3. The motor housing according to claim 2, comprising a fourth silencer duct (SD4) fluidically connected to a fourth outlet opening (O4) of the blower chamber (BC), wherein the fourth silencer duct (SD4) is arranged in a fourth area limited by a fourth angle of less than 90° from the axis and non-overlapping with the first, second and third areas, wherein the fourth silencer duct (SD4) has a fourth outlet opening (S_O4).
4. The motor housing according to any of the preceding claims, wherein the first and second silencer ducts (SD1, SD2) have similar or substantially similar configurations with respect to silencing.
5. The motor housing according to any of the preceding claims, having a general rectangular or substantially rectangular shape, seen in a view parallel with said axis (x).
6. The motor housing according to any of the preceding claims, wherein the blower chamber (BC) has a circular or substantially circular shaped outer wall (BCW), seen in a view parallel with said axis (x), in which the first and second openings (O1, O2) are arranged.
7. The motor housing according to any of the preceding claims, wherein, seen in a view parallel with said axis (x), the blower chamber (BC) extends at least at one point to the external wall (XW) of the motor housing.
8. The motor housing according to any of the preceding claims, wherein the externally accessible flow inlet (E_I) is arranged on a top surface part (TP) of the external wall (XW) of the motor housing.
9. The motor housing according to any of the preceding claims, wherein a first part of the external wall (XW) of the motor housing forms part of the first silencer duct (SD1), and wherein a second part of the external wall (XW) of the motor housing forms part of the second silencer duct (SD2).
10. The motor housing according to any of the preceding claims, wherein the motor housing is constituted by first and second separate polymeric elements (P1, P2) arranged for being assembled, wherein the first separate polymeric element (P1) comprises a top surface part (TP) of the external wall of the motor housing and the at least one wall (W1, W2) of both of the first and second silencer ducts (SD1, SD2).
11. The motor housing according to any of the preceding claims, wherein said at least one wall (W1, W2) between the blower chamber (BC) and the external wall (XW) of the motor housing of both of the first and second silencer ducts (SD1, SD2) serve to cause at least one flow direction bend of 90°-180°.
12. The motor housing according to any of the preceding claims, wherein both of the first and second silencer ducts (SD1, SD2) comprise at least one wall element (W1, W2) dimensioned to act as a quarter wavelength resonator to reduce tonal noise from the blower (BL).
13. The motor housing according to any of the preceding claims, wherein both of the first and second silencer ducts (SD1, SD2) extend, in a direction along said axis (x), from the bottom to the top of the motor housing.
14. A cleaning device for generating an air flow for vacuuming or high pressure cleaning dirt, comprising a motor housing according to any of claims 1-13.
15. A method for manufacturing the motor housing according to any of claims 1-13, comprising - manufacturing a first polymeric element (IM_1) comprising a top surface part of the external wall of the motor housing and said at least one wall between the blower chamber and the external wall of the motor housing of both of the first and second silencer ducts, and - manufacturing a second polymeric element (IM_2) comprising a lower part of the external wall of the motor housing comprising the blower chamber.