Vacuum cleaner having silencer mechanism

• US 5,159,738 A
• Filed: 01/10/1992
• Issued: 11/03/1992
• Est. Priority Date: 06/06/1988
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sunagawa, Masao, Iwao, Akira
• Primary Examiner(s): Hornsby, Harvey C.
• Assistant Examiner(s): Brinson, Patrick F.
• Application Number:
  US07/819,134
• Time in Patent Office: 298 Days
• Field of Search: 15/326, 15/327.2, 55/276, 55/372, 55/DIG. 3, 55/326, 55/472, 181/231
• US Class Current: 15/326
• CPC Class Codes: A47L 9/0081 Means for exhaust-air diffusion; Means for sound or vibration damping
• CPC Class Codes: Y10S 55/03 Vacuum cleaner

Abstract

A blower cover is provided so as to surround an electric driven blower. The blower cover comprises an upper blower cover and a lower blower cover. An exhaust air duct as a silencer mechanism is provided on the upper blower cover and is disposed between a blower receiving chamber and a cord receiving chamber. The exhaust air duct comprising an outer peripheral wall portion and a side wall portion. The outer peripheral wall portion has a partitioning rib and a curved guiding rib. The exhaust air duct forms a U-shaped exhaust air flow passage. An expansion chamber is disposed air flow passage. An expansion chamber is disposed at a down stream of the exhaust air duct. The exhaust air from an intake port of the exhaust air duct flows the U-shaped flow passage and is led to the expansion chamber. The suctioned air is expanded in the blower receiving chamber. The exhaust air is compressed in the exhaust air duct and is expanded again in the expansion chamber.

Claims

1. A vacuum cleaner having a silencer mechanism comprising:

a vacuum cleaner main body,

a blower receiving chamber means for receiving an electric driven blower provided in said vacuum cleaner main body,

a cord winding apparatus receiving chamber means for receiving a cord winding apparatus provided parallel to said blower receiving chamber means in said vacuum cleaner main body, a blower cover for surrounding said blower, an exhaust air duct forming an exhaust air flow passage for bypassing an exhaust air from a side of said blower receiving chamber means, and

an expansion chamber means formed between said blower receiving chamber means and an exhaust air port of said vacuum cleaner main body,

wherein said exhaust air duct comprises said blower cover a side wall portion of said cord winding apparatus receiving chamber means and a side wall portion of said blower receiving chamber means,

said exhaust air duct is formed integrally with said blower cover, and

wherein said exhaust air duct is provided between said blower receiving chamber means and said cord winding apparatus receiving chamber means, whereby the exhaust air exhausted from said blower receiving chamber means flows toward a front side once in said exhaust air duct and changes a direction toward a rear side in said exhaust air duct, and further flows into said expansion chamber means and is exhausted from said expansion chamber means through said exhaust air port of said vacuum cleaner main body.

2. A vacuum cleaner having a sensor mechanism according to claim 1, wherein a sound absorption cover comprising a sound absorption material member is disposed between said blower cover and said blower.

3. A vacuum cleaner having a silencer mechanism according to claim 1, wherein a sound absorption material member is disposed in an inner side of said exhaust air duct.

4. A vacuum cleaner having a silencer mechanism according to claim 1, wherein said expansion chamber means has a cross-sectional area larger than a cross-sectional area of an exhaust air port of said exhaust air duct.

5. A vacuum cleaner having a silencer mechanism comprising:

a vacuum cleaner main body having two main cases,

an electric driven blower chamber means provided in said vacuum cleaner main body,

a cord winding apparatus chamber means provided in said vacuum cleaner main body,

a dust collecting apparatus provided in said vacuum cleaner main body,

blower receiving chamber means for receiving said electric driven blower provided in said vacuum cleaner main body,

a cord winding apparatus receiving chamber means being provided parallel to the blower receiving chamber means for receiving said cord winding apparatus provided in said vacuum cleaner main body,

a blower cover surrounding said blower at an outer peripheral portion of said blower,

an exhaust air duct disposed between said cord winding apparatus receiving chamber means and the blower receiving chamber means, said exhaust air duct forming an exhaust air flow passage for bypassing exhaust air from a side of said blower receiving chamber means to a side of an expansion chamber means formed between said blower receiving chamber means and an exhaust air port of said vacuum cleaner main body,

wherein said exhaust air duct comprises said blower cover, a side wall portion of said cord winding apparatus receiving chamber means and a side wall portion of said blower receiving chamber means, and

wherein said exhaust duct is integrally formed with said blower cover so that exhaust air exhausted from the blower receiving chamber means flows first in a direction toward a front side of said exhaust air duct, reverses a direction so as to flow toward a rear side of said exhaust air duct, and then flows into said expansion chamber means and is exhausted from said expansion chamber means through said exhaust air port.

6. A vacuum cleaner having a silencer mechanism according to claim 5, wherein a sound absorption cover comprising a sound absorption material member is disposed between said blower cover and said blower.

7. A vacuum cleaner having a silencer mechanism according to claim 5, wherein a sound absorption material member is arranged along an inner side of said exhaust air duct.

8. A vacuum cleaner having a silencer mechanism according to claim 5, wherein said expansion chamber means has a cross-sectional area larger than a cross-sectional area of an exhaust air port of said exhaust air duct.

9. A vacuum cleaner having a silencer mechanism comprising:

a vacuum cleaner main body having two main cases,

an blower provided in said vacuum cleaner main body,

a cord winding apparatus provided in said vacuum cleaner main body and being disposed at a side portion of said blower,

a dust collecting apparatus provided in a front portion of said vacuum cleaner main body,

blower receiving chamber means for receiving said blower provided in said vacuum cleaner main body,

a cord winding apparatus receiving chamber means provided parallel to the blower receiving chamber means for receiving said cord winding apparatus

a blower cover surrounding said blower at an outer peripheral portion of said blower, said blower,

an exhaust air duct provided between said cord winding apparatus receiving chamber means and said blower receiving chamber means, and

an expansion chamber means disposed between said blower receiving chamber means and an exhaust air port of said vacuum cleaner main body, said exhaust air duct forming an exhaust air flow passage for bypassing an exhaust air from a side of said blower receiving chamber means to a side of said expansion chamber means,

wherein said exhaust air duct comprises said blower cover, a side wall portion of said cord winding apparatus receiving chamber means and a side wall portion of said blower receiving chamber means, and

wherein said exhaust air duct is integrally formed with said blower cover whereby the exhaust air exhausted from said blower receiving chamber means flows first toward a front side of said exhaust air duct, reverses direction so as to flow to a rear side of said exhaust air duct, and then flows into said expansion chamber means and is exhausted from said expansion chamber means through said exhaust air port of said vacuum cleaner main body.

10. A vacuum cleaner having a silencer mechanism comprising:

a vacuum cleaner main body having two main cases,

a blower provided in said vacuum cleaner main body,

a cord winding apparatus provided in said vacuum cleaner main body and disposed at a side portion of said blower,

a dust collecting apparatus provided in a front portion of said vacuum cleaner main body,

a blower receiving chamber means for receiving said blower provided in said vacuum cleaner main body,

a cord winding apparatus receiving chamber means, provided parallel to the blower receiving chamber means for receiving said cord winding apparatus

an expansion chamber means formed at a rear portion of said blower receiving chamber means,

a blower cover surrounding said blower at an outer peripheral portion of said blower, and

an exhaust air duct provided between said cord winding apparatus receiving chamber means and the blower receiving chamber means,

wherein said expansion chamber means is disposed between an exhaust air port of said exhaust air duct and an exhaust air port of said vacuum cleaner main body,

wherein said exhaust air duct comprises said blower cover, a side wall portion of said cord winding apparatus receiving chamber means and a side wall portion of said blower receiving chamber means,

wherein said exhaust air duct is formed integrally with said blower cover, said exhaust air duct forms an exhaust air flow passage for bypassing exhaust air from a side of said blower receiving chamber means to a side of said expansion chamber means so that the exhaust air exhausted from said blower receiving chamber means flows first toward a front side of said exhaust air duct, reverses a direction and flows toward a rear side of said exhaust air duct, and further flows into said expansion chamber means and is exhausted from said expansion chamber means through said exhaust air port of said vacuum cleaner main body.

11. A vacuum cleaner having a silencer mechanism according to claim 10, wherein said expansion chamber means has a cross-sectional area larger than a cross-sectional area of an exhaust air port of said exhaust air duct.

12. A vacuum cleaner having a silencer mechanism comprising:

a vacuum cleaner main body having an upper main case and a lower main case,

a blower provided between said upper main case and said lower main case,

a cord winding apparatus provided between said upper main case and said lower main case and disposed at a side portion of said blower,

a dust collecting apparatus provided between said upper main case and said lower main case of a front portion of said vacuum cleaner main body,

a blower receiving chamber means for receiving said blower provided between said upper main case and said lower main case,

a cord winding apparatus receiving chamber means disposed parallel to the blower receiving chamber means for receiving said cord winding apparatus between said upper main case and said lower main case and disposed at a side portion of said blower receiving chamber means,

an expansion chamber means provided at a rear portion of said blower receiving chamber means,

a blower cover surrounding said blower at an outer peripheral portion of said blower, and

an exhaust air duct disposed between said cord winding apparatus receiving chamber means and said blower receiving chamber means,

wherein said exhaust air duct comprises an intake port for communicating said blower receiving chamber means and an exhaust air port communicating with said expansion chamber means, said expansion chamber means is disposed between an exhaust air port of said exhaust air duct and an exhaust air port of said vacuum cleaner main body,

said exhaust air duct comprises said blower cover, a side wall portion of said cord winding apparatus receiving chamber means and a side wall portion of said blower receiving chamber means,

wherein said exhaust air duct is formed integrally with said blower cover, and

wherein said exhaust air duct forms an exhaust air flow passage for bypassing exhaust air from a side of said blower receiving chamber means to a side of said expansion chamber means such that exhaust air from said blower receiving chamber means flows first toward a front side of said exhaust air duct, reverses direction and flows to a rear side of said exhaust air duct, and further flows into said expansion chamber means and is exhausted from said expansion chamber means through said exhaust air port of said vacuum cleaner main body.

13. A vacuum cleaner having a silencer mechanism according to claim 12, wherein said exhaust air flow passage in said exhaust air duct is formed with a flow passage bypassing from said intake port of said exhaust air duct to said exhaust air port of said exhaust air duct in a U-shaped form.

14. A vacuum cleaner having a silencer mechanism according to claim 13, wherein said exhaust air duct comprises a partitioning rib and a guiding rib, said partitioning rib partitions the exhaust air flow from a rear side of said exhaust air duct to a front side of said exhaust air duct at an upper portion of said exhaust air duct and further the exhaust air flow from the front side of said exhaust air duct to the rear side of said exhaust air duct at a lower portion of said exhaust air duct, said guiding rib guides the exhaust air flow from an upper side of said exhaust air duct to a lower side of said exhaust air duct, and said partitioning rib leads the exhaust air flow passing through said guiding rib from the front side of said exhaust air duct to the rear side of said exhaust air duct whereby the exhaust air is bypassed in the U-shaped form from said intake port of said exhaust air duct to said exhaust air port of said exhaust air duct.

15. A vacuum cleaner having a silencer mechanism according to claim 14, wherein each of said partitioning rib and said guiding rib is respectively integrally formed with said blower cover.

16. A vacuum cleaner having a silencer mechanism according to claim 15, wherein said blower cover comprises an upper blower cover and a lower blower cover, and each of said partitioning rib and said guiding rib is respectively integrally formed with said upper blower cover.

17. A vacuum cleaner having a silencer mechanism according to claim 16, said guiding rib wherein extends downwardly toward