• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A variable capacity screw compressor comprising a casing, housing two intersecting bores defining a working chamber in which a pair of intermeshing screws comprising helical lands and intervening grooves are mounted to rotate and to compress a working fluid as it is being passed axially through the working chamber from a low pressure inlet wall to a high pressure outlet wall, the inlet wall having an inlet passage in substantially axial alignment with the axes of the rotary screws for filling the ends of the grooves facing the axial inlet passage with working fluid. The capacity of the compressor to operate within a predetermined range of load variations from full load to no load conditions is regulated by a slide valve located on the high pressure side of the compressor and being axially displaceable in response to varying load conditions to expose a by-pass opening for venting partially compressed working fluid directly into the grooves of the compressor screws at a location between the by-pass opening and the axially aligned inlet passage to thereby interrupt admission of cold working fluid into the grooves from the inlet passage.
    公开号:SU873894A3
    申请号:SU731958100
    申请日:1973-08-27
    公开日:1981-10-15
    发明作者:Лундберг Андерс
    申请人:Стал Рефриджерейшн А.Б.(Фирма)；
    IPC主号:
    专利说明:

    one
    The invention relates to the field of compressor engineering. Screw compressors with adjustable capacity are known, comprising a housing with gear rotors installed therein and a movable slide valve f covering a window in the housing for bypassing gas into the suction cavity 1. | Q
    In known compressors, the bypass gas is throttled to the suction pressure, which leads to a decrease in efficiency.
    The goal of the first acquisition is to increase efficiency. .
    This goal is achieved by the fact that a channel is made in the housing, which communicates a bypass window with a depression between the teeth of one of the rotors before cutting it off from the suction no.HOCTH 2Q
    The width of the channel can be equal to the depth of the depression
    Fig, 1 shows a compressor, a longitudinal section in Fig. 2 is the same, a cross section; in FIG. 3, a screwdriver of the rotor surface is screwed.
    The compressor includes a housing 1C with serrated rotors 2 and 3 installed in it and a movable slide valve 4, which is shifted in the housing 130
    a window 5 for bypassing gas into the suction cavity 6. The housing 1 has a channel 7, which communicates the bypass window 5 with a depression 8 between the teeth 9 of one of the rotors before cutting it off from the suction cavity 6. The width of the channel 7 can be paBrfa the width of the depression 8 between the teeth mi 9.
    When the compressor is working during the performance control, part of the gas through the window 5 enters the suction cavity 6 and part goes to the cavity 8 in which the gas pressure is higher, which reduces energy loss and increases efficiency.
    权利要求:
    Claims (2)
    [1]
    1. Screw compressor with adjustable performance, comprising a housing with serrated rotors installed in it and a movable slide valve, overlapping a window made in the housing for gas bypass into a suction cavity, characterized in that, in order to improve the efficiency of controlling the performance, the housing is designed a channel that communicates a bypass window with a depression between the teeth of one of the rotors before cutting it off from the suction cavity.
    [2]
    2. A compressor according to claim 1, characterized in that the width of the channel is equal to the width of the cavity between the teeth.
    Sources of information taken into account in the examination
    1. US patent 3432089, CL. 418-88, published. 1969.
    IG
    Ftl
    类似技术:
    公开号 | 公开日 | 专利标题
    US3088658A|1963-05-07|Angularly adjustable slides for screw rotor machines
    US3088659A|1963-05-07|Means for regulating helical rotary piston engines
    US4074957A|1978-02-21|Screw compressors
    US4060343A|1977-11-29|Capacity control for rotary compressor
    SU873894A3|1981-10-15|Screw compressor with controlled discharge
    US4351160A|1982-09-28|Capacity control systems for screw compressor based water chillers
    US4261691A|1981-04-14|Rotary screw machine with two intermeshing gate rotors and two independently controlled gate regulating valves
    KR950002056B1|1995-03-10|Refrigeration plant and rotary positive displacement machine
    US4610613A|1986-09-09|Control means for gas compressor having dual slide valves
    US4610612A|1986-09-09|Rotary screw gas compressor having dual slide valves
    GB1108569A|1968-04-03|Meshing screw compressor
    US1486836A|1924-03-11|Rotary-pump pressure control
    EP1457679B1|2006-08-02|Screw compressor capable of manually adjusting both internal volume ratio and capacity
    SE8004091L|1981-12-03|VALVE ARRANGEMENTS FOR CAPACITY CONTROL OF SCREW COMPRESSORS
    US4222716A|1980-09-16|Combined pressure matching and capacity control slide valve assembly for helical screw rotary machine
    US2620968A|1952-12-09|Machine of the screw-compressor type
    US4455131A|1984-06-19|Control device in a helical screw rotor machine for regulating the capacity and the built-in volume ratio of the machine
    US3994638A|1976-11-30|Oscillating rotary compressor
    US4362472A|1982-12-07|Rotary compressor with variable built-in volume ratio
    US7165947B2|2007-01-23|Screw compressor capable of manually adjusting both internal volume ratio and capacity and combined screw compressor unit accommodating variation in suction or discharge pressure
    GB959831A|1964-06-03|Improvements in or relating to screw rotor machines
    US3687572A|1972-08-29|Means for regulating the capacity of rotary machines
    GB2122687A|1984-01-18|Meshing-screw gas- compressor
    US3108739A|1963-10-29|Regulating means for rotary piston compressor
    US3656876A|1972-04-18|Rotary screw engine having adjustable internal feed and adjustable outlet control
    同族专利:
    公开号 | 公开日
    SE366374B|1974-04-22|
    GB1444373A|1976-07-28|
    US3877846A|1975-04-15|
    JPS52251B2|1977-01-06|
    JPS4959309A|1974-06-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3088658A|1959-06-04|1963-05-07|Svenska Rotor Maskiner Ab|Angularly adjustable slides for screw rotor machines|
    US3088659A|1960-06-17|1963-05-07|Svenska Rotor Maskiner Ab|Means for regulating helical rotary piston engines|GB1518271A|1974-07-01|1978-07-19|Svenska Rotor Maskiner Ab|Method for the compression ratio of a screw compressor and prime mover|
    US4003199A|1976-03-01|1977-01-18|General Motors Corporation|Turbine engine with air brake|
    JPS6117191U|1984-07-04|1986-01-31|
    JPH0428918B2|1985-10-21|1992-05-15|Hitachi Ltd|
    JPH0191715U|1987-12-07|1989-06-15|
    SE461052B|1988-04-25|1989-12-18|Svenska Rotor Maskiner Ab|LIFT VALVE BY A SCREW ROTATOR|
    EP0902188B1|1997-09-10|2003-05-28|KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd.|Screw compressor|
    GB0821275D0|2008-11-20|2008-12-31|Aaf Mcquay Inc|Screw compressor|
    US9057373B2|2011-11-22|2015-06-16|Vilter Manufacturing Llc|Single screw compressor with high output|
    CN105386980B|2015-11-30|2018-04-06|珠海格力电器股份有限公司|A kind of helical-lobe compressor and air-conditioning system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1109272A|SE366374B|1972-08-28|1972-08-28|
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