• 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 method of controlling the air output of a screw compressor, wherein the average air output of the compressor during operation is adapted to air consumption by throttling the flow of suction air or by connecting the compressor alternately to full air output capacity and idle operation capacity. In order to reduce the power consumption of the compressor, the air output is controlled first by throttling the flow of suction air and by simultaneously measuring underpressure in the suction conduit of the compressor. Thereafter the compressor is controlled so as to operate alternately at full air output capacity and idle operation capacity, and the pressure rise rate in the air-pressure network is measured when the compressor operates at full output capacity and the pressure fall rate is measured when the compressor operates at idle operation capacity. The air consumption and the power consumption of the compressor with both ways of control at this particular air consumption level are calculated on the basis of the values so measured. Thereafter the compressor is connected to apply the control with the smaller power consumption.
    公开号:SU1782293A3
    申请号:SU894742118
    申请日:1989-10-04
    公开日:1992-12-15
    发明作者:Yarma Kojvula；Timo Khalkola；Rejo Nurminen
    申请人:Tampella Oy Ab；
    IPC主号:
    专利说明:

    The invention relates to the field of compressor engineering and can be used to regulate the performance of screw compressors.
    The purpose of the invention is to increase the effects; process efficiency.
    The drawing shows a diagram of a screw compressor for implementing the method.
    Screw, compressor 1 contains a discharge screw 2 IZ, a suction pipe 4 and a discharge pipe 5 connected to a compressed air network. The suction pipe 4 contains a throttle 6. In addition, the suction pipe 4 contains a pressure gauge 7 for measuring the vacuum in the suction pipe 4 compared to atmospheric pressure. The discharge pipe 5, in turn, contains a pressure gauge 8 for measuring pressure in the compressed air network. The pressure gauge 7 of the suction pipe 4 and the pressure gauge 8 of the discharge pipe 5 are connected to a control device 9. which measures the pressure in both pipes 4 and 5. In addition, the control device 9 controls the throttle valve 6 through the control channel 10 and starts and
    1782293AZ stop compressor 1 using the control channel.
    When the compressor 1 is turned on, the control device 9 completely opens the shutter 6, as a result of which the compressor 1 5 draws air through the suction pipe 4 with virtually no vacuum and delivers it through the discharge pipe 5 into the compressed air network. When the pressure in the compressed air network rises to 10 a predetermined value, usually the lower limit value set for the network, the pressure gauge 8 gives a control signal to the control device 9, which begins to close the throttle valve 6 until 15 until the pressure is at a predetermined level, those. until the amount of air supplied by compressor 1 becomes equal to the amount of air consumed by tools and other devices in the 20 network. In these situations, the control device 9 records the amount of rarefaction, from. measured by the pressure gauge 7 of the suction pipe 4 in comparison with atmospheric pressure, and on its basis calculates the air consumption in the network. After that, the control device 9 switches the compressor 1 to two-position control, i.e. to alternately switch the compressor to the highest performance mode and idle mode, as a result of which the throttle valve 6 at first fully opens (the mode at ... the highest performance), and the pressure in the network starts to increase. From the moment of switching 35 g of compressor 1 to the two-position E '* switching regulation control device 9 starts measuring the time required to increase the pressure in the compressed air network to a predetermined upper limit value 40, which is measured by pressure gauge 8, after which the control device 9 closes the throttle valve 6 (idle mode), and measures the fall time, i.e. time required for 45 drops in the network from the permissible upper limit value to the lower limit value. Based on the values and characteristics of the compressor power consumption measured in this way, 1 50 the microprocessor (not shown), which is provided in the control device 9, determines what kind of control at a given load requires less energy. power. This type of regulation is then applied up to a change in operating conditions. In order to ensure that the corresponding type of И й Ь Ь й й Ш зов зов generates the maximum effect ш ^ ^ Ш ((Й ёр ёр ё через через через через через at specified time intervals, which allows you to switch to another type of regulation when changing operating conditions.
    In a preferred embodiment of the invention, the microprocessor calculates, based on the characteristics of the network, the level of air consumption at which the power consumption for both types of regulation is almost the same. Then, the control device 9 determines the amount of air consumed, and when the air consumption exceeds the calculated value, as described above, throttling control is applied. When the air consumption drops below the mentioned value, the compressor switches to on-off regulation. At predetermined time intervals, the measurement of vacuum, pressure growth rate, pressure drop rate is repeated in order to ensure maximum compressor efficiency in terms of power consumption. The rate of pressure growth and the rate of pressure drops can be determined by measuring the time required to increase the pressure from a given lower limit value to a given upper limit value and reduce the pressure from an upper limit value to a lower limit value.
    When the compressor is controlled by two-position control, the control device 9 can also measure the idle time. Korda idling time exceeds a predetermined period of time, the control device 9 stops the compressor 1, because this means that the air consumption in the network is so low that the average power consumption is at a minimum when compressor 1 is temporarily stopped. With normal air consumption, the control device 9 mainly uses throttling control and two-position control, in accordance with the above principle.
    权利要求:
    Claims (5)
    [1]
    Claim
    1. The method of regulating the performance of a screw compressor, including throttling the intake air stream, regulating the performance at maximum performance and idling, characterized in that, in order to increase the efficiency of the process, first regulate the performance by throttling the intake air flow, while measuring the vacuum the compressor suction line, then regulate the performance by alternately switching the compressor to of maximum productivity and idle mode, measuring the rate of increase in pressure in the compressed air network when the compressor is operating in the highest 'capacity mode, and measuring the rate of pressure drop when the compressor is idling, calculate the air consumption and power consumed based on the measured values compressor for each type of capacity control at a given level of air consumption, and use the type of capacity control at which the compressor reblyaet lower power.
    [2]
    2. The method according to claim 1, characterized in that on the basis of the measured values, the limiting value of air consumption is calculated at which the power consumed by the compressor for both types of regulation is the same, and then the compressor performance is controlled by throttling the intake air flow when the air consumption is above the limit value, and regulate the performance by alternately switching the compressor to the highest capacity mode and to idle mode 5 when the consumption level air below the limit value.
    [3]
    3. The method according to claims 1 or 2, characterized in that at predetermined time intervals repeat the measurement of rarefaction
    I0 nii, the rate of increase in pressure, the rate of pressure drop and make the choice of type of regulation of performance.
    [4]
    4. The method according to any one of claims 1 to 3, characterized by the fact that the growth rate is
    15 the pressure drop rate and speed is determined by measuring the time required to increase the pressure from a given lower limit value to a given upper limit value, and! 0 reduce the pressure from the upper limit value to the lower limit value.
    [5]
    5. The method according to any one of claims 1 to 4, which is important in that when the level of air consumption falls below a predetermined lower threshold value, the compressor is stopped, it is started again only when the pressure in the network discharge will fall to a lower limit value.
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    CN2116791U|1992-09-23|Adjustable flow mixed flow pump
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    同族专利:
    公开号 | 公开日
    NO893935L|1990-04-06|
    NO893935D0|1989-10-03|
    SE8903155L|1990-04-06|
    DK489389A|1990-04-06|
    DK489389D0|1989-10-04|
    GB2224078B|1992-11-25|
    DE3932982C2|1996-05-15|
    FI83808C|1991-08-26|
    US4968218A|1990-11-06|
    NO171611C|1993-04-07|
    FI884573A|1990-04-06|
    GB8921831D0|1989-11-08|
    FI884573A0|1988-10-05|
    GB2224078A|1990-04-25|
    DE3932982A1|1990-04-12|
    SE8903155D0|1989-09-26|
    SE505405C2|1997-08-25|
    FI83808B|1991-05-15|
    NO171611B|1992-12-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    RU2655448C2|2013-09-11|2018-05-28|Атлас Копко Эрпауэр, Намлозе Веннотсхап|Screw compressor and method applied therewith|GB256278A|1925-08-03|1926-10-21|Gen Electric|Improvements in or relating to centrifugal compressors and blowers and the like and methods of regulating the same|
    DE764179C|1938-12-28|1953-04-27|Klein|Compressor system with pressure control|
    US3119552A|1960-01-27|1964-01-28|Gutehoffnungshuette Sterkrade|Control mechanism for rotary compressors|
    US3332605A|1965-07-26|1967-07-25|Carrier Corp|Method of and apparatus for controlling the operation of gas compression apparatus|
    US3594093A|1969-07-31|1971-07-20|Carrier Corp|Operation of gas compression apparatus|
    US3860363A|1973-05-10|1975-01-14|Chicago Pneumatic Tool Co|Rotary compressor having improved control system|
    DE2618440A1|1976-04-27|1977-11-10|Sullair Europ Corp|METHOD AND DEVICE FOR CONTROLLING THE OPERATION OF A COMPRESSOR|
    US4052135A|1976-05-11|1977-10-04|Gardner-Denver Company|Control system for helical screw compressor|
    DE2717224A1|1977-04-19|1978-10-26|Mahle Gmbh|Motor-driven air compressor control - has sensor to switch compressor the max. when demand drops below given limit|
    US4201517A|1978-02-03|1980-05-06|Ferguson John R|Automatic control selector for a compressor system|
    US4502842A|1983-02-02|1985-03-05|Colt Industries Operating Corp.|Multiple compressor controller and method|
    GB2167130B|1984-11-19|1988-01-13|Hydrovane Compressor|Rotary positive displacement air compressor|US5054995A|1989-11-06|1991-10-08|Ingersoll-Rand Company|Apparatus for controlling a fluid compression system|
    US5388968A|1994-01-12|1995-02-14|Ingersoll-Rand Company|Compressor inlet valve|
    US5540558A|1995-08-07|1996-07-30|Ingersoll-Rand Company|Apparatus and method for electronically controlling inlet flow and preventing backflow in a compressor|
    DE19625565C2|1996-06-26|1998-07-23|Bosch Gmbh Robert|Fuel feed pump for a fuel injection pump for internal combustion engines|
    DE69831407T2|1997-06-06|2006-06-14|Texaco Development Corp|OXYGEN FLOW CONTROL FOR GASIFICATION|
    US6123510A|1998-01-30|2000-09-26|Ingersoll-Rand Company|Method for controlling fluid flow through a compressed fluid system|
    DE102005040921B4|2005-08-30|2008-10-23|Dienes Werke für Maschinenteile GmbH & Co KG|Dry running screw compressor with pneumatically controlled vent valve|
    JP4627492B2|2005-12-19|2011-02-09|株式会社日立産機システム|Oil-cooled screw compressor|
    AU2007292454B2|2006-09-05|2013-07-18|New York Air Brake Llc|Oil-free air compressor system with inlet throttle|
    US20100155046A1|2008-12-18|2010-06-24|Eric Surawski|Temperature control system for an on board inert gas generation systems|
    DE102016011437A1|2016-09-21|2018-03-22|Knorr-Bremse Systeme für Nutzfahrzeuge GmbH|Screw compressor system for a commercial vehicle|
    CN111189265B|2018-11-15|2021-07-06|上海海立电器有限公司|Air suction supercharging structure and refrigerating system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI884573A|FI83808C|1988-10-05|1988-10-05|Method for controlling air production in a screw compressor|
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