47results about How to "Prevent flow back" patented technology

A multi-cyclone dust collector including at least one first cyclone forcing contaminants-laden air that is entered into a lower portion of the at least one first cyclone to whirl so as to centrifugally separate contaminants from the contaminants-laden air; and at least one second cyclone being disposed around the at least one first cyclone, the at least one second cyclone forcing semi-clean air that is discharged from the at least one first cyclone and is entered into a lower portion of the at least one second cyclone to whirl so as to centrifugally separate fine contaminants from the air.

The invention discloses a production process for a heat preservation vessel inner cavity heat-resistant glass or enamel coating layer; the production process comprises the following steps: step S1, selecting a heat preservation vessel blank made of a metal material, carrying out sandblasting operation on the surface of an inner cavity of the heat preservation vessel blank, and making the surface of the inner cavity of the heat preservation vessel blank form a rough surface; step S2, carrying out enamel spraying operation on the rough surface, to make glass or an enamel glaze sprayed on the rough surface of the heat preservation vessel; step S3, drying the glaze on the rough surface; step S4, placing the heat preservation vessel blank after drying on a bracket; step S5, carrying out sintering operation on the heat preservation vessel blank; and step S6, after completion of sintering, taking the heat preservation vessel blank down from the bracket to obtain the finished product. In the process, in the preparation process of a moisturizing vessel, after a glass layer or an enamel layer is formed on the surface of the inner cavity, the self chemical properties of the glass layer or the enamel layer are relatively stable, no corrosion condition is generated, at the same time, changes of thermal expansion and cold contraction are relatively small, and the finished product is suitable for use as a container such as a heat preservation cup.

The present invention relates to an evacuation tube. It includes the following several portions: sleeve, piston placed in the sleeve, tube mouth, pulling rod and handle. Besides, it also includes an air-resisting piece. Said invention is simple in structure, and can quickly evacuate the package container.

A cost-effective pack adapted to be distributed from an aircraft in the event of a natural, military, political, or other disaster includes an outer package, at least one item in the outer package for aerial delivery, and at least one aerodynamic component formed on the outer package and methods and systems for making the pack.

When volume-changeable elements are used in earpiece apparatus, a valve apparatus for expanding and contracting purposes is provided. A valve apparatus is provided with a discharge opening for the outlet of air from the volume-changeable element. The discharge opening can be closed directly by the volume-changeable element itself.

The invention discloses an automobile coating anolyte circulation protection system comprising an anolyte storage tank, a circulating pump, an anode tube, an anolyte surge tank, a first shunt three-way valve, a turbidimeter and a waste liquid tank; the anolyte storage tank, the circulating pump, the anode tube, the anolyte surge tank and the first shunt three-way valve communicate in order, and a first outlet of the first shunt three-way valve communicates with the anolyte storage tank. A second outlet of the first shunt three-way valve communicates with the waste liquid tank; the first shunt three-way valve has at least two working states: in the first working state, the first outlet is opened, and the second outlet is closed; in the second working state, the first outlet is closed, and the second outlet is opened; the turbidimeter is installed on a pipeline for communicating with the anode tube and the anolyte surge tank, and connected to the first shunt three-way valve; and the turbidimeter is used for detecting the purity of anolyte flowing out of the anode tube, and controlling the working state of the first shunt three-way valve according to the detection result. In the automobile coating anolyte circulation protection system, waste of the anolyte can be reduced.

The invention discloses a steering control system of a tractor, comprising a steering oil cylinder, wherein two working ports of a hydraulic steering gear are respectively communicated with two working cavities of the steering oil cylinder; an electric control steering device comprises a valve element which is controlled by electric signals sent from a navigation controller to cause the direction and flow rate of hydraulic oil to change correspondingly, and two working ports of the valve element are respectively communicated with the two working cavities of the steering oil cylinder; the steering oil pump is respectively communicated with an oil inlet of the hydraulic steering gear and an oil inlet of the valve element; the oil circuit through which the oil inlet of the hydraulic steering gear is communicated with the steering oil pump is connected with a pressure sensor in series, and the pressure sensor is electrically connected with the navigation controller; and an oil return resistance device is arranged on an oil return branch connected with an oil return port of the valve element. The system can automatically release the control of the electric control steering device when the operating personnel operate a steering wheel for steering.

The invention discloses an ammonia gas generation metering spraying device with short response time and a spraying rate control system. The ammonia gas generation metering spraying device with short response time comprises a metering spraying control unit, a hollow large container with an ammonia generation chamber, a cover, a solid-state reducing agent, an electric heater, a liquid discharging pipeline, a heat exchanger, a cooling liquid passage connected with the heat exchanger through a control valve, a gas releasing pipe uniformly provided with openings, a hollow small container which communicates with the ammonia generation chamber through a check valve and a middle pipeline and is provided with a buffering cavity, a secondary electric heater, an exhausting passage which communicateswith the buffering cavity through an electric control valve and an exhausting pipeline and is used for exhausting ammonia gas, and an electric heating line located in the exhausting pipeline and the middle pipeline. A first pressure sensor and a first temperature sensor are arranged in the buffering cavity. A second temperature sensor is arranged in the ammonia generation chamber. Driving signalsof the secondary electric heater are voltage pulse signals with high current signals and low current signals. The ammonia gas generation metering spraying device with short response time and the spraying rate control system can accurately control the release speed of ammonia.

The invention discloses a switch type primary vertical shock absorber for a high-speed train. The switch type primary vertical shock absorber comprises a cylinder body, a guide cover, a valve base, a piston rod and a piston assembly; the guide cover and the valve base are arranged on the cylinder body; a hollow oil storage cavity is machined in the cylinder body; a bottom valve is installed at the bottom of the oil storage cavity; the piston rod is installed on the guide cover; a piston assembly is installed on the piston rod extending into the cylinder body; an oil guide pipe is arranged on the outer side of the guide cover; a flow guide pipe communicated with the oil guide pipe is installed on the valve base; an electromagnetic valve is arranged on the valve base; and a high-frequency damping valve and a low-frequency damping valve are arranged on the valve base at the end, away from the electromagnetic valve, of the flow guide pipe. According to the shock absorber, the valve base, the bottom valve and the guide cover are arranged on the cylinder body, and the oil guide pipe connected with the guide cover and the valve base is arranged, so that when the piston assembly moves, the electromagnetic valve is matched to enable oil to flow through the high-frequency damping valve and the low-frequency damping valve to absorb vibration, and the shock absorber can cope with high-frequency vibration and low-frequency vibration in the train running process.

In an outboard marine drive, a primary partition made of elastomeric material is provided in a lower part of the extension case, and a drive shaft and an exhaust pipe are sealingly passed through the primary partition. Thereby, the extension case is kept out of direct contact from the exhaust gas, and is therefore prevented from excessive heating. The exhaust pipe and the drive shaft typically have a large length, and it is advantageous to support them at parts thereof near a lower end thereof. The use of elastomeric material for the primary partition is particularly advantageous because it not only can favorably insulate heat but also can accommodate any positional errors in the exhaust pipe and the drive shaft relative to the extension case. When a secondary opening is formed in an upper part of the exhaust pipe to prevent excessive build up of exhaust back pressure when the engine is idling, a secondary partition may also be provided in an upper part of the extension case.

The invention relates to a fuel delivery device for cryogenic fuels, comprising a piston pump (1) for delivering the cryogenic fuel at a high pressure, said piston pump (1) having a pump piston (2) that can be moved back and forth and delimits a compression chamber (3) at one end and a pressure chamber (5), which is formed in a hollow cylinder (4) and to which a hydraulic pressure medium can be supplied, at the other end. According to the invention, the pump piston (2) has an annular shoulder (6) for delimiting an additional pressure chamber (7) which is formed in the hollow cylinder (4) and to which the hydraulic pressure medium can likewise be supplied in order to reset the pump piston (2). The additional pressure chamber (7) is coupled to an accumulator volume (8) which is delimited byan accumulator sleeve (9) that is arranged on the hollow cylinder (4) in a movable manner back and forth and is biased by means of a return spring (10).

The invention discloses a bladder circulation continuous flushing device. The bladder circulation continuous flushing device comprises a flushing bottle, wherein the flushing bottle is connected witha bottle cap, and a partition plate is arranged in the flushing bottle; the flushing bottle is divided into an upper flowing chamber and a lower flushing area by the partition plate, a soft film is arranged in the lower flushing area, the upper end of the soft film is connected with the partition plate, the lower end of the soft film is connected with the bottom of the flushing bottle, and the lower flushing area is divided into a filtering chamber and a flushing chamber by the soft film; an annular wall is arranged in the upper flowing chamber, the upper flowing chamber is divided into an inner cavity and an outer cavity by the annular wall, and the outer cavity communicates with the flushing chamber; and the upper end of the inner cavity communicates with the bottle opening of the flushing bottle, and the lower end of the inner cavity communicates with the filtering chamber through a filter screen. The bladder circulation continuous flushing device can be used for quickly cleaning the bladder, the use of flushing liquid can be reduced, resources are saved, and the operation time is shortened; meanwhile, the pressure in the bladder cannot be greatly changed, and the wear resistance of a push rod can be improved.

Systems for actuating at least two engine valves comprise a valve bridge operatively connected to the at least two engine valves and having a hydraulically-actuated lost motion component. The lost motion component comprises a lost motion check valve disposed therein. A rocker arm has a motion receiving end configured to receive valve actuation motions from a valve actuation motion source and a motion imparting end for conveying the valve actuation motions and hydraulic fluid to the lost motion component. The rocker arm is in fluid communication with a hydraulic fluid supply. The systems also comprise an accumulator in fluid communication with the hydraulic fluid supply and disposed upstream of the lost motion check valve. In all embodiments, a fluid supply check valve may be disposed upstream of the accumulator and configured to prevent flow of hydraulic fluid from the accumulator back to the hydraulic fluid supply.

The invention discloses cleaning and maintaining equipment for a water conservancy gate. The cleaning and maintaining equipment comprises a gate box, a gate cavity is formed in the gate box, a communicating cavity is formed in the lower side of the gate cavity in a communicating mode, a switching cavity is formed in the upper wall of the gate cavity in a communicating mode, switching blocks are connected to the front wall and the rear wall of the switching cavity in a left-right sliding mode, the lower side of the communicating cavity communicates with a left-right through flowing cavity, the left side and the right side of the gate cavity are provided with symmetrical rotating rod cavities, the left wall and the right wall of the gate cavity communicate with symmetrical cleaning wheel cavities located on the lower sides of the rotating rod cavities, the upper walls of the cleaning wheel cavities communicate with the lower sides of the rotating rod cavities, symmetrical collecting cavities are formed in the lower sides of the left cleaning wheel cavity and the right cleaning wheel cavity, and the sides, close to each other, of the left collecting cavity and the right collecting cavity communicate with the left wall and the right wall of the gate cavity. The left gate and the right gate work respectively, and the front end surfaces, the rear end surfaces, the left end surfaces and the right end surfaces of the gates can be fully cleaned independently while the gates are recycled and cleaned.