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US 6,709,250 B1Granted
Gear and a fluid machine with a pair of gears
OwnerWei Xionginventor
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OwnerWei Xionginventor
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A kind of gear is provided with shorter teeth, transition teeth and at least one longer tooth. The cross-section of the longer tooth is of a hawk beak shape, and the profile of the longer tooth is smoothly connected in series by a convex section, a tip section, a concave section, and a leading section The two sides of the longer tooth are each provided with a transition tooth which neighbors a shorter tooth on the opposite side of the longer tooth. The pair of engaging gears according to this invention have advantages of reducing the fluid leakage, canceling the inertia of the rotors, and minimizing the vibration and noise. This invention also discloses a fluid machine for conveying, compressing or expanding liquid or gaseous fluids, which includes a casing comprising a housing, an upper end cover and a lower end cover. At least one pair of engaging gears which includes one driving rotor according to this invention and one driven rotor according to this invention is accommodated in the housing. As a result, the leakage between the rotors can be reduced, therefore the compression ratio can be improved. In addition, over compression and under compression can be avoided in operation.
A gear comprising shorter teeth, transition teeth and at least one longer tooth on its pitch circle, wherein the cross-section of said longer tooth is of a hawk beak shape, the profile of said longer tooth is smoothly connected in series by a convex section, a tip section, a concave section, and a leading section, the two sides of said longer tooth are respectively provided with a transition tooth, and each of the transition teeth neighbors a shorter tooth on the opposite side of said longer tooth, characterized in that said convex section and leading section of said longer tooth are designed with a reasonable contact ratio so that the leading section can enter into engagement in time just before the convex section is out of engagement, or the convex section can enter into engagement in time just before the leading section is out of engagement.
A fluid machine for transferring, compressing or expanding the fluids, including a casing comprising a “8”-shaped housing, an upper end cover and a lower end cover, in which at least one pair of engaging gear-shaped rotors working as one driving rotor and one driven rotor are accommodated in said casing, at least one gas absorbing port or air inlet is provided on said casing, at least one gas discharging port or air outlet is provided on said end covers, said driving rotor and driven rotor are provided with shorter teeth, transition teeth and at least one longer tooth on their pitch circles respectively, wherein the cross-section of said longer tooth is of a hawk beak shape, the profile of said longer tooth is smoothly connected in series by a convex section, a tip section, a concave section, and a leading section, the convex section of the longer tooth projects into the outside of the pitch circle, the two sides of said longer tooth are respectively provided with a transition tooth which adjoins a shorter tooth on the opposite side of said longer tooth, characterized in that said convex section and leading section of said longer tooth are designed with a reasonable contact ratio so that the leading section can enter into engagement in time just before the convex section is out of engagement, or the convex section can enter into engagement in time just before the leading section is out of engagement.
A fluid machine for transferring, compressing or expanding the fluids, including a shim in the shape of a part of moon and a casing comprising a cylinder body, an upper end cover and a lower end cover, in which at least one pair of internal engaging gears is accommodated in said casing, working as one driving rotor and one driven rotor respectively, said end covers are provided with through holes for suction and evacuation of gas or liquid, and said driving rotor and driven rotor are provided with shorter teeth, transition teeth and at least one longer tooth on their pitch circles respectively, characterized in that the cross-section of said longer tooth is of a hawk beak shape, the profile of said longer tooth is smoothly connected in series by a convex section, a tip section, a concave section, and a leading section, the convex section of the longer tooth of the external gear projects into the outside of the pitch circle, the convex section of the longer tooth of the internal gear projects into the inside of the pitch circle, and the two sides of said longer tooth are respectively provided with a transition tooth which neighbors a shorter tooth on the opposite side of said longer tooth.
Dependencies are inferred from the claim text.