13results about How to "Prevent surge" patented technology

The invention belongs to the technical field of cast-in-place pile hole collapse prevention, and particularly relates to a silt layer self-balancing hole collapse prevention cast-in-place pile structure which comprises a reinforcement cage and a pile casing, the pile casing is detachably installed at an opening of a cast-in-place pile hole, and the reinforcement cage penetrates through an inner cavity of the pile casing and makes contact with the bottom of the inner cavity of the cast-in-place pile hole. The fixing part is detachably mounted at the top of the reinforcement cage, and the top of the reinforcement cage mounted closest to an opening of a cast-in-place pile hole can be continuously pressed through the fixing part; the adjusting part is arranged outside the fixing part, and the position of the reinforcement cage can be adjusted in time through the adjusting part, so that the central axis of the reinforcement cage coincides with the central axis of the cast-in-place pile hole all the time. According to the concrete foundation pile, through mutual cooperation of the parts, stirrup deformation and main reinforcement bending of the reinforcement cage caused by collapse of a silt layer during concrete pouring can be avoided, the bearing capacity of the built concrete foundation pile is guaranteed, and meanwhile the influence on lifting of the guide pipe and normal construction of a cast-in-place pile hole is avoided.

The invention relates to the technical field of magnetic suspension phase change air conditioners, in particular to a load matching control method for an evaporative cooling magnetic suspension phase change air conditioner, which comprises the following steps: acquiring outdoor wet bulb temperature and system refrigeration load, and comparing with a preset threshold to start different working modes; whether refrigeration output is matched with the requirement or not is judged by comparing the actual temperature with a temperature threshold value in different working modes; if not, calculating the initial adjusting quantity of the key component according to the temperature difference; the current of the key component is sampled in real time, the mutation rate is calculated and compared with a threshold value, the initial adjusting quantity is corrected according to a comparison result, and therefore adjustment and control over all the components are completed. According to the method, multi-dimensional fusion and self-adaptive matching of the load demand, the environmental condition and the equipment state are realized, and the operation risk caused by too fast adjustment or equipment abnormity is effectively avoided while the energy efficiency of the system is improved.

The invention belongs to the technical field of electric power metallurgy automatic control, and provides an annealing furnace combustion-supporting air supply system automatic control method which comprises the steps that a temperature detection element is arranged on an outlet pipeline of a combustion-supporting fan, the temperature of combustion-supporting air is detected in real time, and the optimal rotation speed of the combustion-supporting fan is automatically matched through piecewise linear control according to different combustion-supporting air temperatures on site. On the basis of the optimal rotating speed of the combustion-supporting fan, feedforward control is matched with a PID feedback control algorithm to control the opening degree of an outlet blow-off valve of the combustion-supporting fan so as to adjust the actual combustion-supporting air pressure value; according to the method, a combustion-supporting air temperature detection loop and a piecewise linear control module are added, and automatic matching and giving of the optimal fan rotating speed are achieved. The opening control mode of the blow-off valve is optimized, feed-forward control and PID control are combined, and the pressure stability is improved.

The application discloses a kind of power grid phase different no impact intelligent switching method and device, device includes H bridge circuit, and the midpoint of left, right half bridge is connected corresponding phase line and neutral line by LC filter circuit, and left, right half bridge both ends are connected load after supporting capacitor in parallel, method includes: calculating three-phase voltage unbalance degree;Unbalance degree exceeds the moment of threshold value is decision moment, according to load current, voltage time series data calculation load equivalent impedance, according to load equivalent impedance and decision moment phase voltage and load voltage calculation each phase impact cost, with impact cost minimum phase as target phase;Double-loop control is carried out to target phase H bridge circuit, so that its output voltage tracks decision moment load voltage, if the difference of both is less than the time that safety threshold value meets requirement, after closing the static switch of target phase, control target phase H bridge circuit output voltage transition to target phase real voltage, and shut off the static switch of original phase.The application realizes the truly no impact switching of sensitive load.

This invention relates to the field of centrifugal fan technology, and particularly to a high-pressure centrifugal fan with backward-curved blades. The fan includes a volute, an impeller, and a collector. Both the impeller and the collector are housed within the volute, and the collector is fixedly connected to the volute. The impeller includes a front plate and a rear plate. Multiple blades are arranged in an array around the rear plate. An air intake is located in the center of the front plate. The blades are of a single-plate straight structure, each blade including a leading edge, a trailing edge, a first side connecting the first end of the leading edge and the first end of the trailing edge, and a second side connecting the second end of the leading edge and the second end of the trailing edge. The first side is the side closest to the air intake, and the second side is the side furthest from the air intake. The leading edge includes an arc segment near the air intake and a straight segment away from the air intake. The trailing edge is a straight segment. Both the straight leading edge and the trailing edge are parallel to the impeller hub, and the second side is perpendicular to the impeller hub. This high-pressure centrifugal fan has a larger flow rate and higher pressure.

The invention relates to the technical field of air conditioners, in particular to a fresh air module and an air conditioner, and the fresh air module comprises a fan assembly and a shell. An air inlet cavity is formed in the shell, and a first air inlet communicating with the air inlet cavity is formed in the shell; the fan assembly is connected with the shell, a second air inlet and an air outlet are formed in the fan assembly, and the second air inlet communicates with the air inlet cavity; a bypass cavity is defined by the shell and the fan assembly, and a first backflow inlet and a first backflow outlet are formed in the bypass cavity; the first backflow inlet communicates with the air outlet, and the first backflow outlet communicates with the air inlet cavity. The fan assembly generates suction force to suck the fresh air flow into the air inlet cavity through the first air inlet and then exhaust the fresh air flow through the air outlet, and part of the fresh air flow exhausted from the air outlet can flow back into the air inlet cavity again through the bypass cavity, so that the total air inlet amount entering the fan assembly is increased, surge of the wind wheel is avoided, and user experience is optimized.

The present application relates to coal seam permeability enhancement technical field, and disclose a kind of hydraulic mechanical cavitation device for coal seam permeability enhancement and use method, comprising: rack, the rack is slidably installed with step module, hydraulic machine is slidably installed on the step module;The output end of the hydraulic machine is threadedly connected with first drill rod, the first drill rod is threadedly connected with second drill rod at one end away from the hydraulic machine, and drill-in assembly is connected at the end of the second drill rod away from the first drill rod;Expanding hole assembly is arranged in the second drill rod.By the cooperation of drill-in assembly and driving mechanism, drill bit can be drilled by mechanical impact, and the technical effect of permeability enhancement and cavitation is achieved.Compared with high-pressure water driving technology, the use of mechanical impact has the advantages of accurate control and stable operation, and also avoids the gas gushing, hole plugging and equipment hazards existing in hydraulic permeability enhancement.

The application discloses a magnetic suspension micro gas turbine power station and a control method thereof, and belongs to the technical field of micro gas turbine power generation. The magnetic suspension micro gas turbine power station comprises a micro gas turbine, a magnetic suspension motor and an electronic control system. The micro gas turbine is one of a type without a regenerator, a type with a built-in regenerator or a type with an external regenerator. The air inlet of the centrifugal compressor of the micro gas turbine is arranged in the magnetic suspension motor, and the motor stator is fixed in the air inlet. The centrifugal compressor and the radial turbine are back-to-back arranged on the rotating shaft, the radial turbine is fixed on the cantilever end of the rotating shaft and located outside the two radial magnetic bearings to form cantilever support, and the centrifugal compressor, the radial turbine, the motor rotor and the magnetic bearing rotor adopt a coaxial mounting structure. The application also adopts a double cooling gas path and a three-ring nested control strategy, and realizes high integration, oil-free, efficient cooling and precise dynamic control of the power station.

The present application relates to the technical field of electronic timer, especially to a low-power electronic timer wake-up system and method based on ambient light sensing, which comprises an ambient light sensing unit, a signal processing unit, a wake-up control unit, an electronic timer main control module and a power management module. The sensing unit works in an intermittent sampling mode with duty cycle dynamic configuration to output original photoelectric signals. The signal processing unit tracks the dynamic reference value of ambient light in real time based on a sliding time window difference algorithm, and decouples the light intensity change gradient and the reference deviation. The wake-up control unit builds a two-stage asymmetric verification architecture through a nano-level coarse sieve comparator and a fine verification state mechanism, and outputs the final wake-up enable signal combined with an adaptive weighted matching model. The present application solves the problems of high standby power consumption, susceptibility to ambient light interference and rough energy efficiency management of traditional wake-up circuits, and realizes nano-level ultra-low standby, high confidence wake-up and full-cycle energy efficiency optimization.

This utility model belongs to the field of gas turbine technology, and specifically relates to an air intake device for an aero-derivative gas turbine compressor. The air intake device includes an intake casing, characterized in that: a shroud is fixed inside the intake casing, an inlet rectifier cone is fixed outside the intake casing, a cleaning pipeline is installed on the inlet rectifier cone, and a hydraulic motor drive and lubrication assembly is installed in the inner ring of the intake casing. The hydraulic motor drive and lubrication assembly is enclosed within the shroud, and its pipeline is connected to the hydraulic motor drive and lubrication assembly pipeline. The beneficial effects of this utility model are: it achieves gas turbine intake rectification, avoids leakage of parts affecting intake efficiency, and reduces intake resistance. By accelerating and uniformly introducing external air into the compressor first stage through a tapered channel, it reduces airflow separation, ensures that air enters the compressor flow path smoothly along the axial direction, and avoids compressor efficiency reduction or surge due to uneven flow velocity.

The utility model discloses equipment for efficient gasification and pressurization of liquefied natural gas, which relates to the technical field of gasification and pressurization equipment and comprises a base, one end of the top of the base is fixedly connected with a gasification tank, and the side wall of one end of the gasification tank is fixedly connected with a first heat source inlet end. The side wall of one end of the gasification tank is fixedly connected with a first heat source inlet end, the side wall of the other end of the gasification tank is fixedly connected with a first heat source outlet end, the side walls of the first heat source inlet end and the first heat source outlet end are fixedly connected with first electric valves, and the outer wall of the gasification tank is fixedly connected with a heating sleeve device. On the basis that efficient heat exchange is achieved and gasification efficiency is improved, airflow impact force is reduced through the buffer mechanism, and therefore the problems that in the gasification process of existing liquefied natural gas gasification pressurization equipment, the heat exchange gasification efficiency is low, and the pressurization equipment is prone to being damaged due to the lack of a buffer structure are solved.

This invention provides an air conditioner and its control method. The air conditioner includes: a body with a first air outlet and a second air outlet; an air guiding mechanism is respectively provided at the first air outlet and / or the second air outlet, at least a portion of which is rotatably configured to block or avoid airflow at the first air outlet and / or the second air outlet; and a pressure detection module, located within the body and signal-connected to the air guiding mechanism, which calculates the pressure difference between the first and second air outlets and controls the rotation stroke of the air guiding mechanism based on the pressure difference. This application solves the problem in existing reversible air conditioners where filter blockage during operation leads to unstable airflow and surging.

The utility model relates to power switching technical field, concretely is a kind of power switching switch device, including device ontology, first power module, second power module, chip, relay control unit are set in device ontology;First power module is used to provide a drive power supply to relay control unit;Second power module is used to power supply to chip, and provide a main control input power supply to relay control unit via chip;Relay control unit receives a external power input, and switches output;Chip is used to provide a main control input power supply to relay control unit and output signal via LAN interface and GPIB interface, by fusion GPIB, LAN double interface on the basis of existing structure, and support six-way output independent control adaptation complex test scene, and by chip centralized management power switching, acquisition and communication function, six channel control, display, protection unit is integrated in the device ontology of standard machine case.