[특허]Port arrangement for rotary positive displacement blower

[미국특허] Port arrangement for rotary positive displacement blower 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04C-018/16
출원번호	US-0799760 (1985-11-18)
발명자 / 주소	Soeters Jr. Raymond A. (Farmington Hills MI)
출원인 / 주소	Eaton Corporation (Cleveland OH 02)
인용정보	피인용 횟수 : 33 인용 특허 : 0

초록 ▼

An improved rotory positive displacement blower (10) of the Roots-type with reduced airborne noise and superior efficiency. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) having cylindrical wall surfaces (20a, 20b) and containing meshed lobed rotors (14, 16) having the lobes (14a, 14b, 14c, 16a, 16b, 16c) thereon formed with an end-to-end helical twist according to the relation 360°/2n, where n equals the number of lobes per rotor. Preferably, n equals three. The blower housing (12) also defines inlet and outlet ports (36, 38) and the intersections of wall surfaces (20a, 20b) define a cusp (20d) associated with the inlet port (36) and a cusp (20e) associated with outlet port (38). The inlet and outlet port openings are skewed in opposite directions to increase the time the top lands of the lobes are in sealing relation with cylindrical walls (20a, 20b) of chambers ( 32, 34). Transverse boundaries (20g, 20i) of the inlet port are traversed by the lobes prior to traversal of the inlet port cusp (20d) by trailing ends (14h, 16h) of the lobes. In a similar manner, the transverse boundaries (20n, 20r) of the outlet port are traversed by the lobes subsequent to traversal of the outlet port cusp (20e) by leading ends (14g, 16g) of the lobes. Elongated backflow slots (40, 42) having a length/width ratio of at least four are disposed on opposite sides of the outlet port cusp and substantially parallel to the traversing lobes of the associated rotor. The backflow slots are traversed by the lobes prior to traversal of cusp (20e) and outlet port boundaries (20n, 20r) by the lobes.

대표청구항 ▼

A rotary blower of the backflow type including: a housing assembly defining two parallel transversely overlapping cylindrical chambers having internal cylindrical and flat end wall surfaces, the axes of the cylindrical chambers defining a longitudinal direction; an inlet port and an outlet port opening having, with respect to the longitudinal direction, longitudinal and transverse boundaries defined by and on opposite sides of the housing assembly, said transverse boundaries of each port being disposed on opposite sides of a plane extending longitudinally through the overlapping intersection of the chambers; meshed, lobed rotors rotatably disposed in the chambers, the rotor lobes formed with a helical twist and therefore each having a lead end and a trailing end in the direction of rotor rotation, the ends of the rotors and lobes sealingly cooperating with the end wall surfaces, the lobes of each rotor having top lands extending between the lead and trailing ends, the top lands sealingly cooperating with the cylindrical wall surface of the associated chamber and being operative to traverse the port boundaries disposed on the associated side of the plane for effecting transfer of volumes of compressible inlet port fluid to the outlet port via spaces between adjacent unmeshed lobes of each rotor, and the volume of each transfer volume remaining constant while the top lands of the leading and trailing lobes of each transfer volume are disposed between the associated boundaries of the inlet and outlet ports; the improvement comprising: rapidly opening backflow port means extending through the housing wall of each cylindrical chamber for effecting a backflow of outlet port fluid into each transfer volume prior to traversal of the outlet port boundaries by the top land of the lead lobe of each transfer volume, said backflow port means positioned for traversal by the lead lobe top land of each transfer volume at least 40 rotational degrees after traversal of the inlet port boundaries by the top land of the trailing lobe of each transfer volume.

이 특허를 인용한 특허 (33) 인용/피인용 타임라인 분석

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Swartzlander, Matthew G., Optimized helix angle rotors for Roots-style supercharger.
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Swartzlander,Matthew G., Optimized helix angle rotors for Roots-style supercharger.
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Swartzlander, Matthew G., Optimized helix angle rotors for roots-style supercharger.
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Swartzlander, Matthew G., Optimized helix angle rotors for roots-style supercharger.
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DeVries, Douglas F.; Boyle, David; Holmes, Michael; Williams, Malcolm, Portable ventilator system.
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Prior, Gregory P., Roots supercharger with extended length helical rotors.
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Knutsson, Magnus; Ohlson, Anders; Burenius, Ragnar; Brunberg, Johan; Toma, Amir, Roots-style blower with leakage mechanisms.
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Allum, Todd W., Roots-type blower reduced acoustic signature method and apparatus.
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Northrop, Kurt; Ouwenga, Daniel; Simons, Robert; Magana, Chad, Supercharger.
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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Port arrangement for rotary positive displacement blower 원문보기

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