16 results about "Capacity control" patented technology

The application provides a wind farm backup frequency modulation capacity control method, a control device, a system and equipment. First, a dispatching instruction issued by a wind farm control center is received and the wind speed of each wind turbine is obtained. Then, the load shedding mode of each wind turbine is determined according to the wind speed of each wind turbine. The load shedding mode of the wind turbine with the wind speed less than a first preset threshold is an overspeed load shedding mode, and the load shedding mode of the wind turbine with the wind speed greater than a second preset threshold is a low-speed load shedding mode. The second preset threshold is greater than or equal to the first preset threshold. Meanwhile, the load shedding power of each wind turbine is determined according to the wind speed of each wind turbine and the dispatching load shedding power indicated by the dispatching instruction. Finally, the load shedding of each wind turbine is realized according to the load shedding mode and the load shedding power of each wind turbine. By matching the low-speed load shedding mode for the high-speed wind turbine, compared with the variable pitch control of the prior art, the response speed can be improved, the wind turbine can be quickly adjusted to the backup capacity, and therefore the practicability of the control strategy is improved.

This invention relates to the field of centrifuge unit technology and discloses a capacity control method for a series centrifuge unit, including a startup phase: the high-stage suction guide vane operates according to the set minimum opening degree XL, and the low-stage suction guide vane operates according to the set minimum opening degree YL; when the outlet water temperature SP > the target temperature SV+Ta, the unit obtains the opening degree X of the high-stage suction guide vane through PID calculation and outputs the opening speed of the high-stage suction guide vane to the high-stage compressor, and the opening degree Y of the low-stage suction guide vane follows the opening degree X of the high-stage suction guide vane; otherwise, S40 is executed; when the outlet water temperature SP ≤ the target temperature SV+Ta, or the interruptor control time ≥ tc, S40 is executed; otherwise, S20 is executed; capacity PID control: the opening degree of the low-stage suction guide vane follows the opening degree of the high-stage suction guide vane. This invention effectively solves the problem of capacity and air volume mismatch when different series compressors are used together.

The invention relates to the technical field of centrifugal units, and discloses a tandem centrifugal unit capacity control method which comprises the following steps: a starting stage: a high-section air suction guide vane operates according to a set minimum opening XL of the high-section air suction guide vane, and a low-section air suction guide vane operates according to a set minimum opening YL of the low-section air suction guide vane; when the water outlet temperature SP is larger than the target temperature SV + Ta, the unit obtains the opening degree X of a high-section air suction guide vane through PID operation and outputs the opening speed of the high-section air suction guide vane to a high-section compressor, and the opening degree Y of a low-section air suction guide vane follows the opening degree X of the high-section air suction guide vane; if not, executing S40; when the outlet water temperature SP is smaller than or equal to the target temperature SV + Ta, or the control time of the interrupter is larger than or equal to tc, S40 is executed; otherwise, executing the step S20; and carrying out capacity PID control, wherein the opening degree of the low-section air suction guide vane follows the opening degree of the high-section air suction guide vane. The problem that the capacity and the air volume are not matched when different series of compressors are used in a mixed mode is effectively solved.

Provided is a connector structure of a stepless capacity control actuator of a reciprocating compressor including an ejector rod configured to transfer power provided by a driving structure to an unloader. The connector structure includes a housing sleeving the ejector rod, a connecting member including a flange part and a sleeve part, and a sealing assembly including a first end face sealing ring, a second end face sealing ring, a first seal ring and an oil leakage joint. A first side of the flange part is connected with a second end of the housing and a second side of the flange part is configured to connect with the driving structure. A second oil hole is formed in the sleeve part and in butt joint with a first oil hole. The oil leakage joint is connected to the first oil hole.

The application provides a method and product for train resource and warehouse coordination configuration in rail transit scheduling, breaks through the existing scheduling mode mainly based on fixed operation diagram or simple train level planning, and cooperatively realizes response of station passenger flow demand, train turnaround transportation and warehouse capacity control, generates a potential train set adapted to the space-time characteristics of station passenger flow by taking station passenger flow as a driving force, and cooperatively verifies the occupation, recovery and warehouse operation of train resource through train connection relationship variable, so that the obtained scheduling result not only meets the passenger flow demand at the train level, but also has engineering executability at the train and warehouse level, fundamentally avoids the problem of mutual fragmentation between train operation plan and train resource configuration and warehouse capacity, and the obtained train operation plan and train scheduling plan have engineering implementability.

An improved variable geometry diffuser (VGD) mechanism for use with a centrifugal compressor. This VGD mechanism extends substantially completely into the diffuser gap so that the VGD mechanism may be used more fully to control other operational functions. The VGD mechanism may be used to minimize compressor backspin and associated transient loads during compressor shut down by preventing a reverse flow of refrigerant gas through the diffuser gap during compressor shutdown, which is prevented because the diffuser gap is substantially blocked by the full extension of the diffuser ring. During start-up, transient surge and stall also can be effectively eliminated as gas flow through the diffuser gap can be impeded as load and impeller speed increase, thereby alleviating the problems caused by startup loads at low speeds. The VGD mechanism can be used for capacity control as well so as to achieve more effective turndown at low loads.

A stabilizing link and a drive link of a compressor capacity control valve are physically and / or completely separated, for example, such that the respective links use separate and discrete attachment protrusions disposed on a drive ring and a restrictor ring of the capacity control valve. The discrete attachment protrusions are used to apply a lower stress on each attachment protrusion than links that share some attachment protrusions, including a pair of stabilizing links and drive links. A stabilizing link may be connected to the inter-stage housing. The link assembly allows the restrictor ring to be driven in an axial direction to open or close the compressor capacity control valve.

The application provides a kind of based on the capacity control system and control method of grinder system air volume air pressure, applied to material crushing technical field, including abnormal monitoring module, abnormal monitoring module includes screen abnormal monitoring unit and low-efficiency operation monitoring unit;Screen abnormal monitoring unit is used to determine whether screen exists the trend of blockage, if screen exists the trend of blockage, then feedback to capacity adjustment module to reduce the feed amount of grinder;Low-efficiency operation monitoring unit is used to determine whether grinder exists low-efficiency operation, if grinder exists low-efficiency operation, then feedback to capacity adjustment module to increase the feed amount of grinder;Abnormal monitoring module determines whether the screen of grinder exists the trend of blockage according to the real-time data collected by data acquisition module, on the basis of guaranteeing that screen is not blocked, maintain the minimum airflow required for crushing and transportation, and make the motor of grinder run at maximum load at this time, adjust the feed amount of grinder to realize maximum capacity.

A compressor system for a refrigeration system, comprising a plurality of compressors (1), one of which has a first compressor (1) with continuous capacity control (6), is designed to meet the refrigeration system's power requirements by controlling the first compressor (1) as the lead compressor and switching the other compressors (1) on and off as follow-up compressors. This system is intended to increase the service life of the compressors (1) in the system. For this purpose, at least one of the other compressors (1) has continuous capacity control (6), which is speed-independent. The compressor system is further designed to alternatively meet the refrigeration system's power requirements by controlling one of the other compressors (1) as the lead compressor and switching the first and, if applicable, the remaining compressors (1) on and off as follow-up compressors.

Stabilization and drive linkages of a compressor capacity control valve are separated, for example physically and / or entirely, such that the respective linkages use separate and discrete attachment projections provided on the drive and throttle rings of the capacity control valve. The use of discrete attachment projections places lower stress on each attachment projection compared to linkages including paired stabilization and drive linkages sharing some attachment projections. The stabilization linkages can connect to an interstage casing. The linkage assemblies allow the throttle ring to be driven in an axial direction so as to open or close the compressor capacity control valve.

Example implementations involve a sealing liquid delivery system for a mechanical capacity control device of a screw compressor comprising a mechanical capacity control device including a mechanical capacity control valve movable to vary an amount of gas compressed by die screw compressor; a mechanical capacity control device housing including a cavity configured to receive the mechanical capacity control device, a gap formed between the mechanical capacity control device housing and the mechanical capacity control valve: a pressurized sealing liquid delivery member carried by the mechanical capacity control device housing and configured to supply sealing liquid under pressure to the cavity of the mechanical capacity control device housing to inhibit leakage through the gap between the mechanical capacity control device housing and the mechanical capacity control valve.

Stabilization and drive linkages of a compressor capacity control valve are separated, for example physically and / or entirely, such that the respective linkages use separate and discrete attachment projections provided on the drive and throttle rings of the capacity control valve. The use of discrete attachment projections places lower stress on each attachment projection compared to linkages including paired stabilization and drive linkages sharing some attachment projections. The stabilization linkages can connect to an interstage casing. The linkage assemblies allow the throttle ring to be driven in an axial direction so as to open or close the compressor capacity control valve.

The invention relates to a compressor system for a refrigeration unit, comprising a plurality of compressors (1), a first compressor (1) having a speed-independent continuous capacity control device (6), said compressor system being adapted to control the first compressor (1) as a master compressor and to turn on and off a subsequent compressor (1) as a slave compressor, therefore, the capacity requirement of the refrigerating unit is met, and the service life of the system compressor (1) is prolonged. For this purpose, each compressor (1) has a speed-independent continuous capacity control device (6) for pulse width modulation control on the basis of the valve opening time, and meanwhile, one of the other compressors (1) can serve as a main compressor to be controlled by the compressor system through adjustment, and the first compressor and the subsequent compressor (1) which serves as a slave compressor when necessary are started and stopped, so that the capacity requirement of the refrigerating unit is alternately met.

To provide a screw compressor capable of achieving both expansion of a capacity control range and miniaturization.SOLUTION: The screw compressor includes a screw rotor, a rotor chamber, a suction space, a discharge space, a slide valve, and a slide valve guide provided in the discharge space. The slide valve is configured to open an inlet of a bypass passage, which allows the rotor chamber and the suction space to communicate with each other, to an inner wall surface of the rotor chamber when the slide valve moves toward the discharge space. The slide valve guide has a guide surface and a first groove provided in the guide surface and communicating with the discharge space. The slide valve has a sliding surface facing the guide surface, and a second groove provided in the sliding surface. When the inlet of the bypass passage is open and the first groove and the second groove are opposed to each other, the communication passage including the first groove and the second groove provides communication between the bypass passage and the discharge space.SELECTED DRAWING: Figure 2

A confluence control part of a slewing-type construction machine controls a confluence switch valve such that the confluence switch valve is switched to a suspension state when a slewing and boom raising manipulation action is performed. A pump capacity control part of the slewing-type construction machine executes a capacity control when the slewing and boom raising manipulation action is performed, the capacity control including regulating a first pump capacity and a second pump capacity respectively in such a manner that the first pump capacity increases and the second pump capacity decreases as an operating pressure difference resulting from the subtraction of a slewing operating pressure from a boom operating pressure increases, and the first pump capacity decreases and the second pump capacity increases as the operating pressure difference decreases.