[특허]Stepping type unloading system for helical screw rotary compressor

Stepping type unloading system for helical screw rotary compressor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04B-049/00 F01C-001/16
출원번호	US-0242100 (1981-03-10)
발명자 / 주소	Shaw David N. (Unionville CT) Gagnon Joseph A. L. N. (Windsor Locks CT)
출원인 / 주소	Dunham Bush, Inc. (West Hartford CT 02)
인용정보	피인용 횟수 : 22 인용 특허 : 0

초록 ▼

A stepping piston is projected into the path of a slide valve drive piston to limit piston movement and thus the slide valve towards maximum unload position determined by piston bottoming out against the cylinder wall. The slide valve main drive piston stroke is also correlated to desired slide valve positions along the intermeshed helical screw rotors of the helical screw rotary compressor to provide, for example, stepped unloading at compressor full load, two-thirds full load, and one-third full load.

대표청구항 ▼

A stepping type slide valve unloading system for a positive displacement helical screw rotary compressor, said compressor comprising: a compressor casing provided with a barrel portion defined by intersecting bores with coplanar axes located between axially spaced end walls and having a low pressure suction port and a high pressure discharge port in communication with said bores at opposite ends of said barrel portion, helical screw rotors having grooves and lands and being mounted for rotation within respective bores with the lands and grooves of respective rotors intermeshed, an axially extending recess provided within the barrel portion of the casing and in open communication with said bores, a slide valve member longitudinally slidable in said recess with the inner face of the slide valve member being complementary to the envelope at that portion of the bores of the casing structure confronted by the opening of the recess communicating with the bore portion of the case, said slide valve member being in sealing relation with the confronting rotors, at least a portion of the discharge port being located within the barrel portion of the casing with the slide valve member being movable between extreme positions with the end of the slide valve member proximate to the suction port variably closing off a portion of the recess in open communication with the suction port and functioning as a bypass for a gaseous working fluid, a linear drive motor for said slide valve member, said motor comprising a cylinder, a main drive piston sealably and slidably positioned within said cylinder and a piston rod connecting said piston to said slide valve member, said piston forming with said cylinder an inboard chamber on the side of said piston proximate to said slide valve member, and an outboard chamber on the opposite side thereof, and means for supplying and relieving hydraulic fluid pressure to at least one of said chambers for shifting said slide valve member between extreme positions, the improvement comprising: a stepping piston carried by said linear motor and including a portion shiftable between retracted and projected positions into and out of one of said chambers to physically abut said main drive piston and to stop said main drive piston at an intermediate position between the slide valve member extreme positions to thereby define with the main drive piston of said linear motor, three distinct capacity control step positions for said slide valve member.

이 특허를 인용한 특허 (22)

Lee Liang-Chen,TWX, Capacity regulating apparatus for compressors.
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Santos, Pedro; Pitts, Jeremy; Nelson, Andrew; Santen, Johannes; Walton, John; Westwood, Mitchell; O'Hanley, Harrison, Compressor.
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Nemit, Jr., Paul; Comstock, Angela Marie; Kopko, William L., Compressor with a bypass port.
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Santos, Pedro; Pitts, Jeremy; Nelson, Andrew; Santen, Johannes; Walton, John; Westwood, Mitchell; O'Hanley, Harrison, Compressor with liquid injection cooling.
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Santos, Pedro; Pitts, Jeremy; Nelson, Andrew; Santen, Johannes; Walton, John; Westwood, Mitchell; O'Hanley, Harrison, Compressor with liquid injection cooling.
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Santos, Pedro; Pitts, Jeremy; Nelson, Andrew; Santen, Johannes; Walton, John; Westwood, Mitchell; O'Hanley, Harrison, Compressor with liquid injection cooling.
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Schibbye Lauritz B. (Saltsj-Duvns SEX) Englund Rolf A. (Spanga SEX), Device for controlling the internal compression in a screw compressor.
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Holt James A. ; McMurtrie William Dennis, Electric switch gauge for screw compressors.
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Ouwenga, Daniel Robert; Swartzlander, Matthew G., High efficiency supercharger outlet.
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Hansen, Craig N.; Cross, Paul C., Internal combustion engine and supercharger.
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Murphy David A. (Chambersburg PA) Spellar Peter C. (Hagerstown MD), Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor.
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Murphy, David A.; Spellar, Peter C., Micro-processor control of compression ratio at full load in a helical screw rotary compressor responsive to compressor drive motor current.
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Schaefer Donald D. (Farmington CT), Modular unload slide valve control assembly for a helical screw rotary compressor.
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Lifson, Alexander; Perkovich, Mark J., Refrigerant system with multiple load modes.
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Daeyaert Guido J. E. (Mortsel BEX), Rotary compressor with capacity regulation valve.
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Wilson, Francis P.; Shoulders, Stephen L., Screw compressor having a slide valve with hot gas bypass port.
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Pileski, Peter J., Screw compressor pulsation damper.
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Fujiwara, Hideki; Gotou, Hideyuki; Miyamura, Harunori; Gotou, Nozomi, Screw compressor with adjacent helical grooves selectively opening to first and second ports.
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Zhu, Yu, Screw compressor with adjustable internal volume ratio.
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Nagata Kimio (Shimizu JPX) Nozawa Shigekazu (Shimizu JPX) Izushi Minetoshi (Shimizu JPX), Screw compressor with slide valve movement preventing structure.
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Yoshimura Shoji (Hyogo JPX), Slide valve type screw compressor.
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Pillis Joseph W. (Hagerstown MD) Murphy David A. (Chambersburg PA) Spellar Peter C. (Hagerstown MD) Nemit ; Jr. Paul (Waynesboro PA), Variable volume ratio screw compressor with step control.
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IPC	Description
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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연합인증

Stepping type unloading system for helical screw rotary compressor 원문보기

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Stepping type unloading system for helical screw rotary compressor 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (22)

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