55results about How to "Prevent reverse flow" patented technology

The invention provides a blast furnace tap hole apparatus. The apparatus comprises a drilling rod, a connecting sleeve and a bit shank which are sequentially connected; the drilling rod has a through hole, a drill bit is welded to one end of the drilling rod, the other end of the drilling rod has a threaded connection with the connecting sleeve, a sealing sleeve is arranged between the connecting sleeve and the bit shank, and the connecting sleeve, the sealing sleeve and the bit shank form one body; the sealing sleeve is provided with a wind inlet and a water inlet, and the wind inlet and the water inlet are connected with the through hole respectively; and one end of the bit shank far from the sealing sleeve is provided with a stern notch, the middle portion of the bit shank is provided with a spline, and the spline and the bit shank form one body. The bit shank, the connecting sleeve and the sealing sleeve are designed to form one body, so the assembling part and the connecting portion are reduced, and the fracture of the weak link of a fitting connection is avoided; and the tail end of the bit shank is provided with the impact stern notch, so when an opening machine impacter impacts, an impact tail portion is difficult to impact and damage, and the service life of a connecting mechanism is prolonged.

The invention discloses a pipeline dirt removal device used for civil engineering, and belongs to the technical field of pipeline cleaning. The pipeline dirt removal device comprises a water deliverypipe and a collection assembly. The collection assembly is mounted at one end of the water delivery pipe, and the other end of the water delivery pipe is connected with a water delivery port. A scraping assembly and a cleaning assembly are sequentially mounted on the portion, behind the collection assembly, of the water delivery pipe, wherein the cleaning assembly comprises an inner pipe connectedwith the water delivery pipe in a sleeved mode, the inner pipe is connected with a rotatable outer pipe through a bearing, water outflow pipe orifices are uniformly distributed in the surface of theouter pipe and the surface of the inner pipe, and the water outlet ends of the water outflow pipe orifices are convex. Water outlets corresponding to the water outflow pipe orifices in position are formed in the outer surface of the joint of the water delivery pipe and the inner pipe. The pipeline dirt removal device has the advantages that the interior of curved pipelines can be cleaned, solids,grease, dirt and the like in the pipelines can be removed, and the cleaning efficiency is high.

The invention relates to the technical field of automobiles, in particular to an automatic automobile brake hydraulic control system which comprises a brake main cylinder assembly, a brake wheel cylinder assembly, an energy storage assembly, an electric control unit, an information acquisition assembly, a first electromagnetic valve and a second electromagnetic valve. An oil outlet of the brake main cylinder assembly is communicated with an oil inlet of the first electromagnetic valve, an oil outlet of the first electromagnetic valve is communicated with an oil inlet of the brake wheel cylinder assembly, an oil outlet of the energy storage assembly is communicated with an oil inlet of the second electromagnetic valve, an oil outlet of the second electromagnetic valve is communicated with the oil inlet of the first electromagnetic valve, and the energy storage assembly, the brake wheel cylinder assembly, the first electromagnetic valve, the second electromagnetic valve and the information acquisition assembly are electrically connected with the electric control unit. The automatic automobile brake hydraulic control system has the advantages that the automatic automobile brake hydraulic control system is improved on the basis of the traditional anti-lock brake system (ABS) hydraulic control systems, oil circuits are simple, and the automatic automobile brake hydraulic control system and an automobile with the automatic automobile brake hydraulic control system have conventional brake, anti-lock brake system and automatic brake functions.

The invention discloses a photovoltaic system input impedance detection circuit method and device. The photovoltaic system input impedance detection circuit comprises a first sub-circuit, a second sub-circuit and a third sub-circuit, wherein the first sub-circuit is used for changing the internal resistance value connected into a photovoltaic system; the second sub-circuit is used for preventing current from reversely flowing into the photovoltaic inverter through the first sub-circuit; according to the invention, the first sub-circuit is arranged, and the disconnection and connection of the first sub-circuit are controlled, so that the internal resistance value connected to the photovoltaic system is changed, and the parameter data of the photovoltaic system are obtained through the operation controller, so that the input impedance of the photovoltaic system is obtained. The input impedance of the photovoltaic system is calculated, and the input impedance of the photovoltaic system can be obtained only through the combination of the first sub-circuit and the operation controller, so that the detection cost is reduced; and meanwhile, the second sub-circuit can effectively prevent the current from reversely flowing into the photovoltaic inverter through the first sub-circuit, so that the safety of the detection circuit is improved.

The invention relates to the technical field of petroleum exploitation, in particular to a check valve for petroleum pipeline transportation and a using method thereof.The check valve comprises a check valve body, a check valve oil inlet and a check valve oil outlet are formed in the check valve body, and a stop plate is rotationally arranged in the check valve oil inlet; a stop plate is arranged in the check valve body, a stop brake mechanism is arranged on the portion, on one side of the stop plate, of the check valve body, the stop plate is used for conducting pressure reduction sealing on the check valve oil inlet, a sealing plate is rotationally arranged in the check valve oil outlet, and one end of the sealing plate is arranged in the check valve oil outlet through a spring. The stop plate in the oil inlet of the check valve and the sealing plate in the oil outlet of the check valve can conduct sealing immediately after petroleum transportation is stopped, reverse backflow of petroleum is prevented, the flow stopping effect is obviously enhanced, meanwhile, the stop plate in the oil inlet of the check valve and the sealing plate in the oil outlet of the check valve can further achieve the pressure reducing effect, and the sealing effect is greatly improved. The structure is simple, resistance is small, and the sealing effect is good.

The invention discloses an air injection box and a reaction kettle. The air injection box comprises two half shells and two cover bodies; the two half shells are buckled to form an air cavity, the outer surface of each half shell is provided with a plurality of annular grooves and linear grooves communicating with the corresponding two adjacent annular grooves; the two cover bodies are used for covering the outer surfaces of the two half shells respectively, annular air channels are defined by the annular grooves and the cover bodies, and linear air channels are defined by the linear grooves and the cover bodies; the cover bodies are provided with a plurality of circles of vent holes corresponding to the annular air channels respectively. Air inlets communicating with the linear air channels are formed in the middles of the half shells. One-way valves are arranged at the air inlets, and the air inlet end of the one-way valves face the air cavity.