94results about How to "Eliminate backflow" patented technology

The invention discloses a nozzle of a combustion chamber of a miniature gas turbine, relates to the gas turbine technology, and in particular to a small size fluid fuel nozzle used in a combustion chamber of a 100 kW level miniature gas turbine. The nozzle consists of three parts which are a fuel oil passage, a fuel air passage and an air channel at the root of a burner, comprehensively utilizes the advantages of pneumatic nebulization and pressure atomization, and is a combined type high performance pneumatic atomizing nozzle. The nozzle of the invention has the characteristics that: the nozzle adopts a conventional processing method to realize excellent atomization of the fuel in small scale space, so as to meet the requirement for the quality of fuel atomization under a quite wide burden of the combustion chamber of the miniature gas turbine; the nozzle can avoid burnout and overcomes the defect of nozzle blockage caused by high temperature coking of the fuel; meanwhile, the nozzle can make the fuel in the combustion chamber to be combusted more fully and reduce discharge of pollutants such as smoke black and so on.

A circulatory assist apparatus comprising: an inflatable pumping balloon having a proximal end joined to an elongated balloon catheter, the balloon catheter having a distal end joined to the pumping balloon and a proximal end, separated from the distal end by a length sufficient to extend from within a circulatory lumen to the outside of a patient's body, for receiving positive and negative pressure pulses from a pump to inflate and deflate the pumping balloon; and a radially expandable frame, mounted on one of a segment extending distally from the pumping balloon, the balloon catheter, and a sleeve tube surrounding the balloon catheter. The expandable frame is manipulate to expand within the circulatory lumen, and functions to space apart the inflatable balloon from the circulatory lumen, having a first diameter in a collapsed configuration for intraluminal delivery and a second, larger diameter in an expanded configuration achieved by said manipulation.

The invention discloses a medical infusion stand. The medical infusion stand comprises an infusion chair, a supporting bracketis vertically fixed on the side wall of the infusion chair, a shell is fixed at the upper end of the supporting bracket, the shell is of a hollow structure, an opening is formed in one side of the shell, the inner wall of the upper end of the shell is connected with a hanging block through two first springs, the side wall of the upper end of the hanging block is provided with an infusion bottle, a bottle mouth of the infusion bottle penetrates through the hanging block,an infusion tube is inserted into the infusion bottle, the infusion tube penetrates through the side wall of the lower end of the shell, an ejector rod is arranged on one side wall of the hanging block, the side wall of the upper end of the shell is provided with an alarm device, theside wall of the lower end of the alarm device is provided with an alarm pressing switch, and the alarm pressing switch penetrates through the side wall of the upper end of the shell. According to the medical infusion stand, afterinfusion of the infusion bottleis completed, alarming can be automatically performed to remind nursesof replacing the infusion bottle, amanner of manually pressing an alarm switch is replaced, and the safety ofinfusion can be improvedin the absence of a guardian.

The invention relates to the field of a real-time online mixing technology of a double-component material, and provides double-component gluing equipment. The double-component gluing equipment adopts two electronic metering plunger pumps with new structures, wherein the two electronic metering plunger pumps respectively and independently execute the fluid transportation and metering of two components, so as to match with a glue mixer to finish the online matching mixture of double component colloids. The defects that the glue mixture is easy for failure, low in precision, difficult to regulate the mixture proportion or a prepared special mixed glue is complicate in equipment structure, tedious to operate, high in cost and the like in an existing technology can be overcome.

The invention discloses a combined hydraulic rectification device of a pump station water inlet pool at an ultralow water level. The combined hydraulic rectification device comprises a diversion canal, a front pool, a water inlet pool, a water inlet pipe, a water inlet flared pipe, a flow guide table, an underwater vortex elimination cover plate and a W-shaped flow guide pier, wherein the water inlet pipe downwards extends into the rear end of the water inlet pool; the water inlet pipe is connected with the water inlet flared pipe; the flow guide table is arranged on a bottom plate of the water inlet pool and is coincident with the axial line of the water inlet flared pipe; the circumference surface of the flow guide table is a smooth curve surface; the cross section of the flow guide table is a round plane, and the area is gradually decreased from bottom to top; the underwater vortex elimination cover plate is arranged at the rear end of the water inlet pool, and is positioned in a connection position of the water inlet pipe and the water inlet flared pipe; the W-shaped flow guide pier is arranged on the bottom plate of the water inlet pool and is tightly attached to the rear wall of the water inlet pool; the W-shaped flow guide pier is formed by two flow guide edge piers and one flow guide middle pier; the W-shaped flow guide pier is higher than the underwater vortex elimination cover plate. The combined hydraulic rectification device has the advantages that the water flow of the water inlet pool is enabled to be uniform and stable, so that a water pump machine unit stably, safely and reliably operates at the ultra-low water level of the water inlet pool.

A blade for an axial fan, including at least a front edge portion, a back edge portion, and multiple pressure balance holes. The front edge portion operates to blow air from the outside of the blade, the back edge portion operates to blow air to the outside of the blade, and the pressure balance hole is disposed on the back edge portion. The pressure balance holes are adapted to balance pressure and reduce pressure difference between the front side and the back side of the blade, eliminating backflow phenomenon caused by separation of boundary layer airflow at the back edge portion on a windward side of the blade and thus reducing power consumption and noise, and preventing dust from settling on the back edge portion on the windward side of the blade.

The invention relates to the technical field of gas-liquid separator parts, in particular to a cyclone separator. The cyclone separator comprises a container body. A blade type inlet pre-separation device is installed at the position of an inlet of the container body. A blade type or wire-mesh-structured mist eliminator is installed in the container body. The mist eliminator is located at the upper portion of the blade type inlet pre-separation device. A multi-pipe axial flow cyclone separation device is installed at the upper portion of the mist eliminator. The multi-pipe axial flow cyclone separation device is fixed in the container body through a detachable fixing plate. A draining pipe is connected to the lower portion of the multi-pipe axial flow cyclone separation device. The draining pipe communicates with the mist eliminator and extends towards the lower portion of the container body. According to the cyclone separator, the total liquid removing efficiency is high and can be higher than 98%, the capability of treating tiny mist drops is very high, and the problem of overload liquid resistance of liquid does not exist.

The present invention relates to a switch circuit of power switching. The switch circuit provided by the invention comprises: a logic gate conversion module, a first driving module, a second driving module, a first switch module and a second switch module. The logic gate conversion module is configured to convert input logic control signals into first logic driving signals and second logic driving signals; the first driving module is configured to output first switch signals and second switch signals according the first logic driving signals; the second driving module is configured to output third switch signals and fourth switch signals according to the second logic driving signals; and the first switch module is configured to output voltage to a load under the control of the first switch signals and the second switch signals, or the second module is configured to output voltage to the load under the control of the third switch signals and the fourth switch signals. According to the invention, the problem of the system fault caused by simultaneously conducting diverter switches because of the disordering of control signals is solved, the complete separation of the control signals and a heavy current is realized, and the weight of the system device is reduced; and moreover, the switch circuit of power switching has an important practical value.

A ventilation system for an air or gaseous fluid has a housing having an inlet (50) and an outlet (52), an axial fan (16) and an accelerating/deflecting structure (18). The axial fan has a casing (36) attached to the housing. Moreover, the axial fan (16) has a motor mounted within the casing and blades (32) also mounted within the casing to generate a flow of said fluid in an axial direction. The accelerating/deflecting structure (18) is devised and positioned to orient the flow generated by the axial fan (16) in a direction transverse to said axial direction. The accelerating/deflecting structure (18) can either be mounted upstream or downstream of the axial fan (16). Furthermore, the accelerating/deflecting structure (18) can either be mounted within or outside the housing.

The invention provides a high-pressure common rail pump high reliability and long service life single-way check valve which comprises an oil outlet hole, a spring base, a returning spring and a sealing ball, wherein a sliding guiding sleeve is additionally arranged between the returning spring and the sealing ball, the right end surface of the sliding guiding sleeve is provided with a ball body supporting surface, a reset oil hole in the bottom of the ball body supporting surface is communicated with a spring limit hole, a side surface oil inlet channel is arranged on the cone surface of a cone segment, the side surface oil inlet channel is communicated with the spring limit hole, and the sealing ball, the sliding guiding sleeve, the returning spring and the spring base are sequentially arranged inside the oil outlet hole. The sealing ball is in sealing contact with a sealing cone surface under the centering supporting of the ball body supporting surface under the effect of the returning spring, and an opening and closing distance of the check valve is axially formed between the sliding guiding sleeve and the spring base. The sealing ball is supported by the ball body supporting surface in the moving process in a centering mode, the sealing ball can guide and cannot be damaged, the sealing belt formed between the sealing ball and the sealing cone surface is stable and reliable, the flowing back of high pressure oil can be prevented, and the high-pressure oil supply performance and the service life of a common rail pump are improved.

The invention discloses an open channel diffusion section flow-equalizing device and a method for calculating a placement position of the open channel diffusion section flow-equalizing device. The open channel diffusion section flow-equalizing device is characterized by comprising an isosceles triangular top plate (1), a dovetailed bottom plate (2), two upstream front slope plates (3), an isosceles-triangular upstream rear slope plate (4), a flank outer wall (5) and a flank inner wall (6), wherein the dovetailed bottom plate (2) is arranged parallel to the top plate (1); the two upstream front slope plates (3) are connected with the outer lateral edge of the top plate (1) and the outer lateral face of the bottom plate (2); the isosceles-triangular upstream rear slope plate (4) is superposed with the bottom of the top plate (1); the vertex angle of the isosceles-triangular upstream rear slope plate (4) inclines to the plane of the bottom plate (2); the flank outer wall (5) is connected with the rear lateral edges of the upstream front slope plates (3) and the tail end point of the bottom plate (2); the flank inner wall (6) is connected with the waist of the upstream rear slope plate (4) and the tail end point of the bottom plate (2). According to the open channel diffusion section flow-equalizing device and the method for calculating the placement position of the open channel diffusion section flow-equalizing device, the theoretical and technical problems of short-distance diffused water-flow smooth joint are solved through the flow division effect of two flanks of the flow-equalizing device.

The invention discloses a method and device for regulating the speed of a fan. In an electronic apparatus provided with at least two fan frames, when a system detects out that a fan in one of fan frames is invalid, the regulation is performed by increasing the rotation speed of the fan in the normal frame and reducing the rotation speed of the fan in the fan frame in which the invalid fan is arranged. According to the invention, when the fan in one fan frame is invalid, the significant reflow and low-speed area can be eliminated, the apparatus is kept in normal running for a long time and is kept safe, and therefore, enough time is provided for an apparatus repairer.

The invention relates to a cooling system and a vehicle. The cooling system is used for performing heat dissipation on of an automobile engine, and comprises a radiator, a fan and a wind guide cover, wherein a universal joint is arranged mounted between the fan and the engine; and the fan is arranged mounted in the wind guide cover and can rotate relative to the wind guide cover. The universal joint principle is creatively utilized, so that the fact that large radial relative movement gap is reserved between the fan and the wind guide cover is avoided, direct hot air backflow and wind pressure loss caused by the gap are eliminated, and the heat -dissipating efficiency is improved.

The invention discloses a system and a method applied to cascaded utilization of energy of exhaust air, an air conditioner and a heat pump water heating device. The system comprises an outdoor air conditioning device, an air source heat pump water heating unit outdoor device, an air exhausting device side static pressure box, an outdoor device side static pressure box, an energy cascaded utilization system controller, at least one variable-frequency air exhausting device and a plurality of air valves. The invention also discloses a control method of the energy cascaded utilization system. The method comprises the following steps: arranging building air outlets in air inlet areas of the outdoor air conditioning device and the air source heat pump water heating unit outdoor device; and controlling opening and closing of the air valve, forward rotation and backward rotation of a bidirectional axial flow fan of the air source heat pump water heating unit outdoor device and variable-frequency operation of the variable-frequency air exhausting devices. The system and the method are capable of simultaneously carrying out cascaded utilization of cooling/heating energy and cascaded utilization of airflow kinetic energy, enhancing air exhaust, reducing air exhaust energy consumption, eliminating the phenomena that the air exhaust is not smooth and even the natural air flows backward, recycling the cooling/heating energy in the exhaust air, improving the efficiency of the outdoor unit of the air conditioner and the heat pump water heating unit, and reducing the operation energy consumption of the system.

The invention discloses a spaced staggered reverse ski-pump energy dissipation hydraulic rectifying device and method. The device comprises a gate, a diversion canal, a front pool, an intake pool, spaced bottom sills, spaced reverse deflecting flow energy dissipation piers, a rectifying beam and a depressed plate, wherein the spaced bottom sills are arranged behind the gate, and are distributed symmetrically along the center line of the diversion canal; the spaced reverse deflecting flow energy dissipation piers are arranged behind the spaced bottom sills, and are distributed symmetrically with the spaced bottom sills in a staggered way along the center line of the diversion canal, and the quantity of the spaced reverse deflecting flow energy dissipation piers is one less than that of the spaced bottom sills; the upstream faces of the spaced reverse deflecting flow energy dissipation piers are reverse water current circular-arc curved surfaces, the longitudinal sections are reverse water current circular-arc curves, and the horizontal sections are rectangular; the rectifying beam is distributed at the front end of the front pool; the depressed plate is arranged at the back end of the front pool. The spaced bottom sills and the spaced reverse deflecting flow energy dissipation piers can be applied to different diversion projects as different combinations.

The invention discloses a climbing machine vehicle which comprises a vehicle body, wherein the vehicle body is provided with wheels; the end, facing a wall surface, of the vehicle body is connected and fixed with an adsorption mechanism; the adsorption mechanism comprises a shell; a cavity with a circular cross section is formed in the shell; the cavity is provided with a closed end surface and an open end surface; the open end surface forms an end surface for adsorbing the wall surface; the closed end surface is fixedly arranged at the end, facing the wall surface, of the vehicle body; a rotating power source is installed on the end, opposite to the wall surface, of the vehicle body; blades arranged in the cavity are connected with an output shaft of the rotating power source; the closed end surface is in an airtight state; the blades are linearly distributed along the axis of the cavity; and a soft flexible sealing structure is arranged between the outer edge of the open end surface and the wall surface. According to the invention, fluff strips are arranged between the outer edge of the adsorption mechanism and the wall surface to form flow resistance which can prevent the outside air from back flowing into the cavity of the adsorption mechanism, thereby eliminating the influence of back flow to the rotating flow in the cavity.

The invention discloses an air inlet ventilation structure used for an aircraft auxiliary power system. The structure comprises an aircraft auxiliary power system cabin (1) and an air inlet channel (2) which is formed in the aircraft auxiliary power system cabin. An auxiliary power system body (3) is arranged in the aircraft auxiliary power system cabin and communicates with the air inlet channel. A closed type annular guide channel (5) is formed in the inner wall of the aircraft auxiliary power system cabin. A cat ear air inlet (4) is formed in the aircraft auxiliary power system cabin and communicates with the guide channel. Diversion spray nozzles (6) are arranged in the positions, perpendicular to the aircraft auxiliary power system cabin, of the guide channel, are located at the side, close to the auxiliary power system body, of the guide channel, and communicate with the guide channel. According to the air inlet ventilation structure provided by the invention, a single cooling air inlet is changed into a plurality of cooling air inlets based on a prior air inlet ventilation structure, and flowing and heat exchanging in the auxiliary power cabin are optimized.

The present invention provides a finned tube and a heat exchanger. The finned tube comprises a base tube and a plurality of fin groups arranged in the axial direction of the base tube and connected with the outer wall of the base tube, and the fin groups are arranged in parallel; each fin group comprises two fins arranged in a mirror image, each fin is divided into three parts in the length direction of the corresponding fin, the first part is the windward area, the second part is the reflux area, and the third part is the leeward area; and a vortex generator is arranged on each windward area,a reflux blocking device is arranged on each reflux area, and the end of each leeward area is of a fillet structure. According to the finned tube, each windward area has better heat transfer condition and has better heat transfer capacity by additionally arranging the corresponding vortex generator; each reflux area is provided with the corresponding reflux blocking device, the reflux can be reduced or even eliminated, and the ash deposition is reduced; and the heat transfer effect of each leeward area is poor, the ash deposition is more, and the fillet structure is adopted on the reflux so as to reduce the flow resistance effectively.

A composite structure printed circuit board type LNG vaporizer core with a thermoelectric generator comprises straight rib channels and wing-shaped rib channels which are alternately stacked up and down, wherein each straight rib channel sequentially comprises a first partition plate, a straight rib plate and a first thermoelectric generation module from top to bottom, and the wing-shaped rib channel sequentially comprises a second partition plate, a wing-shaped rib plate and a second thermoelectric power generation module from top to bottom. The flat rib channel is a hot fluid channel through which propane or a low-boiling-point organic working medium flows, and the wing-shaped rib channel is a cold fluid channel through which LNG flows. A thermoelectric generator is integrated in a printed circuit board type LNG vaporizer, and a tapered longitudinal vortex generator and a dimpled structure are adopted to perform heat transfer enhancement on the propane or low-boiling-point organic working medium side straight rib channel and the LNG side wing type rib channel respectively, so that part of LNG cold energy is converted into electric energy while efficient gasification of LNG is ensured, and the device has the advantages of being simple and compact in structure, high in heat transfer efficiency, energy-saving, environment-friendly and high in applicability.