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US 4,361,928 AGranted
Muffled exhaust system for hot water vacuum extraction machine
AssigneeParise & Sons, Inc.
InventorRainer R. Schulz
Life of this patent
Estimating the term…
Abstract
A unitary tubular exhaust duct directs exhaust air from a scroll type outlet for a vacuum pump mounted within a hot water vacuum extraction machine into a baffled exhaust expansion chamber. Noise reduction is accomplished by mixing the exhaust air with the motor cooling air aspirated into the expansion chamber by an exhaust duct branch terminating at its end remote from the exhaust expansion chamber in a cylindrical shroud which surrounds the vacuum pump electrical drive motor casing and the area of the cooling air exhaust holes within that motor casing.
Claims5
In a hot water vacuum extraction machine including:
- an imperforate casing,
- a dump bracket mounted to said casing,
- a vacuum pump assembly fixedly carried by said casing and underlying the dump bucket,
- said vacuum pump assembly including a pump casing defining a plenum chamber,
- a suction fan mounted for rotation within said vacuum pump casing,
- said plenum chamber including an air inlet in sealed fluid communication with the interior of said dump bucket,
- said vacuum pump assembly further including an electric motor driving said suction fan,
- said vacuum pump casing including a scroll on the discharge side of said suction fan and terminating in a tubular exhaust pipe extending tangentially from the suction pump casing,
- said motor including a cylindrical motor casing,
- cooling air inlet openings at one end of said housing,
- cooling air outlet openings within the other end of said motor casing,
- air inlet openings within said machine casing to permit cooling air to circulate through said air inlet and air outlet openings of said motor casing for cooling said motor,
- the improvement comprising a sound muffling and air expansion chamber within said casing and exhaust duct means coupled to said exhaust pipe and leading to the sound muffling and air expansion chamber,
- said duct means including means for channelling cooling air discharging from said cooling air outlet openings of said motor casing for aspiration by air discharge from the exhaust pipe into said sound muffling and air expansion chamber, and
- air outlet means within said machine casing and communicating to the interior of said sound muffling and air expansion chamber;
- whereby, reduction in noise level of the machine is accomplished by mixing the exhaust air from the vacuum pump with the motor cooling air and expanding the same within the sound muffling and air expansion chamber prior to exhausting the air outwardly of said casing.
13 more elements
In a hot water vacuum extraction machine including:
- an imperforate, generally parallelepiped casing,
- a recessed top wall for said imperforate casing,
- a cylindrical dump tank removably mounted within said recess and having its bottom wall flush with the recessed bottom wall of said imperforate casing,
- a cylindrical vacuum pump assembly fixedly mounted to the interior of said casing and underlying said dump bucket,
- said vacuum pump assembly including a cylindrical pump casing defining a plenum chamber and bearing a rotatable suction fan within said casing,
- said vacuum pump casing including a scroll portion terminating in a tangential tubular discharge pipe of reduced diameter with respect to the cross-sectional diameter of said scroll casing portion,
- said vacuum pump assembly including an electrical motor beneath said plenum chamber and said scroll and including a cylindrical motor casing,
- said electric motor operatively coupled to said suction fan for driving said fan in rotation and producing a vacuum pressure within said plenum chamber,
- means for sealably transmitting said vacuum pressure to said dump tank,
- cooling air inlet openings within said cylindrical motor casing adjacent said scroll pump casing section,
- cooling air outlet openings within said motor casing at the end of said motor casing remote from said plenum chamber,
- the improvement comprising:
- means including horizontal and vertical baffle plates, defining an elongated enlarged sound muffling and air expansion chamber within said machine casing, and
- a unitary tubular exhaust duct comprising a bifurcated member including a main duct section having a large diameter portion remote from said tangential exhaust pipe leading from said scroll portion of said pump housing, and
- a smaller diameter portion proximate thereto, sized to the diameter of said exhaust pipe and being sealably connected thereto to form a venturi in the area of intersection of the exhaust pipe and the small diameter portion of said exhaust duct, and
- an exhaust duct branch having one end opening to the large diameter portion of said exhaust duct main branch, downstream of said venturi,
- said exhaust duct branch at the other end terminating in a cylindrical shroud surrounding said motor housing and being spaced radially thereof to form an annular passage for leading cooling air passing through said motor into said branch duct for aspiration into the main stream of air emanating from the exhaust pipe of the vacuum pump casing and passing through said exhaust duct,
- and wherein the large diameter end of said exhaust duct opens to the interior of the sound muffling and air expansion chamber,
- and openings within said machine casing to the interior of the air muffling and expansion chamber;
- whereinby, noise reduction is accomplished by mixing the exhaust air with motor cooling air and letting it expand into the sound muffling and air expansion chamber prior to exhausting out of said casing through said casing openings.
17 more elements
Dependencies are inferred from the claim text.