[특허]Undercompression and overcompression free helical screw rotary compressor

[미국특허] Undercompression and overcompression free helical screw rotary compressor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F04B-049/02
출원번호	US-0492084 (1974-07-26)
발명자 / 주소	Shaw David N. (Unionville CT)
출원인 / 주소	Dunham-Bush, Inc. (West Hartford CT 02)
인용정보	피인용 횟수 : 40 인용 특허 : 0

초록 ▼

An axially shiftable slide valve member in a rotary, helical screw compressor carries a port which senses the pressure of the working fluid in the trapped volume just before uncovering of the closed thread to the discharge port and compares that pressure with the line pressure at the discharge port and shifts the slide valve member to balance the pressures and prevent overcompression or undercompression of the compressor. The screw compressor may be provided with two identical but oppositely oriented slide valve members on opposite sides of the intermeshed helical screws with one slide valve member controlling the capacity of the compressor and the other balancing the closed thread pressure at discharge with discharge line pressure. Compressor rotation may be reversed to eliminate the need for a reversing valve where the compressor operates in heat pump or reverse flow defrost refrigeration applications, with the two slide valves trading functions.

대표청구항 ▼

In a positive displacement rotary screw compressor of the type wherien a casing is provided with a barrel portion defined by intersecting bores with coplanar axes located between axially spaced end walls and having low pressure and high pressure ports in communication with said bores at opposite ends of said barrel portion, and helical screw rotors having grooves and lands mounted for rotation within respective bores with the lands and grooves of respective rotors intermeshed, an axially extending recess is provided within the barrel portion of the casing in open communication with the bores, and a slide valve member is axially slidable in the recess with the inner face of the slide valve member being complementary to the envelope of that portion of the bores of the casing structure confronted by the opening of the recess communicating with the bore portion of the casing structure, with the valve member in sealing relation with confronting rotors, the discharge port being located within the barrel portion of the casing structure with the valve member being movable between extreme positions, in one of which, the discharge port is fully open, and the other in which, the discharge port is closed, and wherein the valve member is of sufficient length to cover the entire remaining length of the confronting portion of the rotor structure throughout the range of movement of the valve member between its extreme positions, the improvement comprising: means for sensing the pressure of the working fluid within a closed thread closely adjacent to the end of the slide valve member closing off the discharge port to the closed thread, means for sensing the compressor discharge pressure of the working fluid at the discharge port, and means for controlling shifting of said slide valve member axially to equalize these pressures to prevent undercompression or overcompresSion of the compressor working fluid within the closed thread, prior to discharge.

이 특허를 인용한 특허 (40) 인용/피인용 타임라인 분석

Shaw ; David N., Air source heat pump with multiple slide rotary screw compressor/expander.
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Lee Liang-Chen,TWX, Capacity regulating apparatus for compressors.
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Shaw David N. (Unionville CT), Combined pressure matching and capacity control slide valve assembly for helical screw rotary machine.
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Tang, Yan; Fraser, Bruce A., Compact control mechanism for axial motion control valves in helical screw compressors.
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Nemit, Jr., Paul, Compressor.
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Flanigan, Paul J., Compressor slide valve support.
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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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Szymaszek Paul G. (Waukesha WI), Control means for gas compressor having dual slide valves.
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Glanvall Rune V. (Norrkping SEX), Control section for a control system for controlling the internal volume of a rotary compressor.
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Shoop John C. (Quincy IL) Post Roger L. (Quincy IL) Herschler Michael G. (Quincy IL), Control system for helical screw compressor.
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Shaw David N. (Unionville CT) First David J. (Carlisle MA), Control system for screw compressor.
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Shaw David N. (Unionville CT) First David J. (Carlisle MA), Control system for screw compressor.
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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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Lindstrm Paul (Norrkping SEX), Device for controlling the volumetric capacity of a screw compressor.
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Shaw David N. (Unionville CT), Heat pump system with high efficiency reversible helical screw rotary compressor.
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Schaefer Donald D. (Farmington CT) Shaw David N. (Unionville CT) Gagnon Joseph A. M. (Windsor Locks CT), High speed variable delivery helical screw compressor/expander automotive air conditioning and waste heat energy recover.
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Shaw David N. (Unionville CT), Integrated thermal solar heat pump system.
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Shaw David N. (Unionville CT), Multi-step regenerated organic fluid helical screw expander hermetic induction generator system.
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Centers Steven D., Multistage blowdown valve for a compressor system.
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Steven D. Centers, Multistage blowdown valve for a compressor system.
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Steven D. Centers, Multistage blowdown valve for a compressor system.
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Yonemoto, Ryuichiro; Kato, Eisuke; Urashin, Masayuki; Yamada, Shinichiro, Piston operated bypass valve for a screw compressor.
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Kawamoto, Yasuo, Refrigerating system.
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Matsuoka Fumio (Kanagawa JPX) Yamazaki Kisuke (Kanagawa JPX) Tezuka Tomofumi (Shizuoka JPX) Mochizuki Tetsuya (Shizuoka JPX) Tanabe Yoshihiro (Shizuoka JPX), Reversible rotary compressor and reversible refrigerating cycle.
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Axelsson Rolf I. (Norrkoping SEX), Rotary compressor with variable built-in volume ratio.
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Sjte,uml/o/ holm Lars (Sollentuna SEX) Ludin Stig (Vrmd SEX), Rotary displacement compressor with adjustable outlet port edge.
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Matsubara Katsumi (Shimizu JPX) Nozawa Shigekazu (Shimizu JPX) Ishii Masaharu (Shimizu JPX) Miyagawa Mitsuhiko (Shimizu JPX), Screw compressor.
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Sowards, Brian David, Screw compressor assembly and method including a rotor having a thrust piston.
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Pileski, Peter J., Screw compressor pulsation damper.
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Inoue, Takashi; Masuda, Masanori; Ueno, Hiromichi; Hossain, Mohammod Anwar; Matsuoka, Akira, Screw compressor with slide valve including a sealing projection.
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Orosz Joseph S. (Storrs CT) Schaefer Donald D. (Farmington CT) Bianco Anthony J. (New Britain CT), Screw step drive internal volume ratio varying system for helical screw rotary compressor.
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Schibbye Lars (lgvgen SEX) Englund Arnold (Sandkullsvgen SEX), Valve system for capacity control of screw compressors.
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Kay, Steven D.; Shapiro, Jeffrey S.; Hammerquist, Robert E.; Hartney, Steven A., Variable booster for hybrid pneumatic regenerative system.
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Nemit, Jr., Paul, Variable volume screw compressors using proportional valve control.
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Garland Milton W. (Waynesboro PA), Volume ratio control means for axial flow helical screw type compressor.
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[미국특허] Undercompression and overcompression free helical screw rotary compressor 원문보기

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[미국특허] Undercompression and overcompression free helical screw rotary compressor 원문보기

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