129results about How to "Surge suppression" patented technology

An internal baffle apparatus for use within tanks, in particular flexible tanks, for liquids for dampening surges of liquid, and tanks having such baffle apparatus, wherein the baffle apparatus comprising a plurality of panel members connected along a connection line that defines an axis wherein said panel members extend radially from the axis such that each panel member is oriented in a radial plane, and each panel member having a bottom edge, a top edge portion and a remote edge opposite the axis, wherein the bottom edge of each panel includes first connector means operable for connecting the bottom edge at a plurality of connection points to the bottom wall of the tank, and the top edge portion includes second connector means located remote from the axis that are operable to connect the top edge portion to an upper part of the tank.

The present disclosure relates to a multiple-capacity centrifugal compressor, which includes a plurality of capacity-control mechanisms. Each of the capacity-control mechanisms includes an inlet guide vane and an outlet diffuser, so that the multiple-capacity centrifugal compressor provides a flexible control strategy. In addition, the present disclosure further provides a method for controlling the multiple-capacity centrifugal compressor that effectively adjusts and controls the capacity-control mechanisms by coarsely adjusting the inlet guide vanes and combined with subsequently adjusting the outlet diffusers.

The invention discloses a system for preventing reverse recovered charges in a DUT. The system is a current injection circuit connected to the two ends of the DUT in a forward bias mode. The injected current circuit comprises a pulse nS-level pulse signal generator formed by an SRD and a pulse edge acceleration circuit formed by a BG2 and a BG1, wherein the pulse edge acceleration circuit is tightly connected with the back of the pulse nS-level pulse signal generator and used for shortening the rising edge time and the falling edge time of pulses. The system has the advantages that the reverse recovered features of the DUT can be improved, the reverse recovered charges can be reduced, and the reverse recovered time can be shortened; meanwhile, switching losses and conduction losses of the DUT can be reduced, electromagnetic interference and surges can be restrained, and efficiency is improved.

The invention provides a power supply charging control circuit and a power supply charging control method. The power supply charging control circuit is characterized in that an AC (Alternating Current) power supply outputs a direct current through a rectification module to charge an electrolytic capacitor, so as to form a charging loop, a plurality of current limiting modules are connected in parallel and then connected to the charging loop in series, when the power supply charging control circuit is powered up, one or several current limiting modules in the plurality of current limiting modules are controlled to be conducted at different time by an MCU (Microprogrammed Control Unit), so as to charge the electrolytic capacitor. Through adoption of the power supply charging control circuitof the invention, one or several current limiting modules in the plurality of current limiting modules are controlled to be conducted at different time, so that resistances of current limiting resistors in the charging loop are different when charging is performed at different time, in addition, the resistance of the current limiting resistor which is charged firstly is large so as to suppress surge, and the resistance of the current limiting resistor which is charged later is small so as to accelerate a charging speed, in comparison with a conventional charging circuit with a single current limiting resistor or without current limiting resistor, the power supply charging control circuit of the invention accelerates the charging speed while suppressing a large surge charging current, thereby improving operation stability of the whole circuit device.

The invention relates to a centrifugal compressor using an asymmetrical bladed diffuser with variable blade consistencies in the circumferential direction, and belongs to the technical field of turbomachinery. The centrifugal compressor comprises a volute, a centrifugal impeller and the bladed diffuser. The inlet front edge positions and the bladed mounting angles are evenly distributed in the circumferential direction, the blade consistencies are asymmetrically distributed in the circumferential direction, and the consistencies are unequal in different circumferential positions. The blade consistencies are changed by changing the central angles (namely the front edge interval between every two adjacent blades) corresponding to flow channels. The compressor can effectively adapt to the downstream circumferential pressure distortion of the bladed diffuser, the nonuniformity of a flow field in the bladed diffuser is reduced, the flowing stability of the centrifugal compressor is effectively improved, and the stable working range of the centrifugal compressor is enlarged.

The present invention is a currency-operated liquid dispensing machine for liquid retained in a plurality of removable and replaceable containers such as carboys or bags. More specifically, it is for a vending machine for dispensing metered quantities of water.

A centrifugal compressor includes a housing that accommodates a wheel. The housing includes an air intake space formed on an entrance side of the wheel; a flow passage to guide fluid compressed by the wheel to the outside of the housing; a return flow passage opened on each wall surface of the air intake space and the flow passage to circulate a part of the fluid in the flow passage to the air intake space without passing through the wheel; and an introduction portion provided in the air intake space, and having an inner peripheral surface that forms a flow passage to guide the fluid from the outside of the housing to the wheel. A downstream end of the inner peripheral surface in a flowing direction of the fluid is located inside in the radial direction of a shaft than the wall surface of the housing.

The present invention provides a DC overvoltage protection circuit, including a voltage limiting circuit mounted on the circuit board of the case, characterized in that the voltage input end is electrically connected with a variable impedance electronic switch, an overvoltage detecting circuit and a ripple detecting circuit respectively, the overvoltage detecting circuit and the ripple detecting circuit are electrically connected to the input end of the variable impedance electronic switch, the output end of the variable impedance electronic switch is electrically connected to the spike snubber circuit, output voltage by the voltage output end. The invention is used as an attaching device which is serial connected on the front of the product using electricity, capable of preventing spike and surge, the circuit has lower voltage drop at the same time, the circuit is general, fir for product having larger power and smaller power, having widely application. The invention adopts unit having smaller volume adding the upper limit of the working voltage of the present product, greatly improving the power supplying compatible ability and the credibility of the electrical appliance compared with the traditional spike, surge preventing circuit.

The invention belongs to an intelligent three-phase electricity-saving protection controller which comprises a three-phase firewire, a zero line input terminal and an earth wire input terminal, wherein the three-phase firewire and the earth wire input terminal are connected with an input end of a transient surge suppression unit; an output end of the transient surge suppression unit and the zero line input terminal are connected with an input end of a voltage adjusting three-phase balancing unit, an output end of the voltage adjusting three-phase balancing unit is connected with an input end of a harmonic compensation unit, and an output end of the harmonic compensation unit is connected with a load. The intelligent three-phase electricity-saving protection controller integrates the advantages of a system type, a filtering compensation type, a voltage adjusting type and an electromagnetic type electricity-saving protection devices, so as to have good comprehensive treatment effect, reduce the electricity-saving cost, avoid installation and debugging for a plurality of electricity-saving devices in the installing process, save manpower, physical resources, financial resources and time consumption, and be suitable for a power system and electric equipment with multiple voltage classes.

In an exhaust blowing fan, if surging occurs, the changing and vibration of the pressure generate, and the changing and the vibration as well as sound syntonizing with the sound of blades together generate noise (sound pressure level) and lead blow-in capability to decline. Therefore, the invention aims to provide an exhaust blowing fan which inhibits the cause of surging as possible namely generation of swirling flow. The exhaust blowing fan comprises an impeller consisting of a shaft hub and a plurality of blades arranged around the shaft hub, a motor used to rotate the impeller rotate, and a motor shell which receives the impeller and the motor and is approximately of a cylindrical shape, wherein the shell is formed by connecting a tube expanding cylinder part with large diameter and a main tube cylinder part with small diameter through a reducing tube cylinder part with gradually-reducing diameter. In addition, The middle position of the axial height of the blades is set at a place where the dividing line of the reducing tube cylinder part and the main tube cylinder part is at distance which is less than 20 percent of the height of the axis of the blades from the axis of the blades forward and backward respectively.