48results 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 invention discloses an excavator boom energy regenerating device and a boom energy regenerating valve block of the excavator boom energy regenerating device, relating to the technical field of the excavator. The excavator boom energy regenerating device comprises a power oil path, a pilot oil path, a loading oil path, a boom energy regenerating valve block and an oil return oil path, wherein, the operating speed of the boom is identified by the boom energy regenerating valve block through pilot pressure change of the pilot oil path; when the pilot pressure reaches the first preset value, hydraulic oil, flowing out from the fourth oil hole and in the boom oil cylinder small cavity is controlled to flow into the boom oil cylinder large cavity between the power oil path and the loading oil path through a first oil hole, so as to achieve regenerating function. With the adoption of the excavator boom energy regenerating device and the boom energy regenerating valve block of the excavator boom energy regenerating device, the boom operating speed is identified by the excavator boom energy regenerating device according to the pilot pressure change, the boom energy regenerating function is activated after the pilot pressure reaches the preset value, and the hydraulic oil in the regenerating boom oil cylinder small city is regenerated, so that the energy consumption of the excavator is reduced and the operating efficiency of the excavator is improved.

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 semiconductor wafer processing system (40) including a factory interface (26) operating at atmospheric pressure and mounting plural wafer cassettes and further including plural wafer processing chambers (42, 44) mounted on a frame (16) and connected to the factory interface through respective slit valves. A robot in the factory interface can transfer wafers (32) between the cassettes and the processing chambers. At least one of the processing chambers can operate at reduced pressure and is pumped by a vacuum pump (46) mounted on the frame. The processing chamber may be a rapid thermal processing chamber (52) including an array of lamps (66) irradiating a processing volume (100) through a window (60). The lamphead is vacuum pumped to a pressure approximating that in the processing volume. A multi-step process may be performed with different pressures. The invention also includes a wafer access port (202) of a thermal processing chamber which can flow (210) an inert gas in outside of the slit valve to thereby form a gas curtain outside of the opened slit (206) to prevent the out flow of toxic processing gases.

The invention discloses an overvoltage protection device in a portable device. The device includes an overvoltage detection signal generation unit for detecting an overvoltage of power applied from an external device and outputting an overvoltage detection signal; an overvoltage interruption unit controlled by the overvoltage detection signal of the overvoltage signal generation unit, which determines the whether the applied power should be supplied to the main circuit; and an overvoltage and return current interrupting unit for delivering or interrupting power applied to the main circuit and interrupting current flowing back from the battery according to the determination of the overvoltage interrupting unit.

A buffer circuit capable of switching between input mode and output mode includes a first transistor for outputting a prescribed voltage to an input / output terminal depending on a conductive state during the output mode of the buffer circuit, a pre-driver for controlling the conductive state of the first transistor during the output mode of the buffer circuit, and a power supply circuit for providing a first power supply to the pre-driver during the output mode of the buffer circuit and providing or blocking the first power supply to the pre-driver in accordance with an input voltage to the input / output terminal during the input mode of the buffer circuit.

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 present application relates to a steam iron comprising a steam generator and a sealed chamber having an inlet positioned so that calcified deposits formed in the steam generator fall under the influence of gravity through said inlet and into the chamber when the iron is moved from an ironing position into a non-ironing position. The chamber includes an inlet conduit that extends from the inlet and leads into a collection reservoir. The inlet conduit is configured so that water which flows from the steam generator into the collection reservoir through the inlet conduit when the iron is placed in said non-ironing position is trapped in the chamber when the iron is moved back into said ironing position. This occurs due to a balance of pressures between water in the collection reservoir, which acts against water that fills the inlet conduit, and atmospheric pressure that acts against water that fills the inlet conduit across the inlet.

The invention relates to a separator with a filtering function, which comprises a fan, a bucket-shaped shell, a glue suction tube and a glue discharge tube, wherein the fan is installed above the bucket-shaped shell and communicated with the cavity of the bucket-shaped shell; the glue suction tube is positioned on the side surface of the upper end of the bucket-shaped shell and also communicated with the cavity of the bucket-shaped shell; the glue discharge tube is arranged at the lower end of the bucket-shaped shell; a filter is connected with the lower end of the bucket-shaped shell; and the filter is connected with the flue discharge tube. Because the filter is additionally arranged between the bucket-shaped shell and the glue discharge tube, when the recovered glue is discharged from the separator, glass fiber is filtered by the filter, thereby preventing glass fiber from being sprayed on a wet felt to result in uneven surfaces of products; and even if the glue residue on the inner wall of the separator falls off, the glue residue is blocked by the filter, and the filter can be disassembled and cleaned periodically, thus the glue discharge tube can not be blocked and normal production of a gumming system can be ensured.

A device for removing foreign material from a molten metal surface in a steel sheet hot-dip galvanizing process, of the present invention, comprises: a snorkel part of which the end portion is submerged under the molten metal surface of a hot-dip galvanizing bath so as to encompass a steel sheet inserted into the hot-dip galvanizing bath, in order to prevent the oxidization thereof; a snout including a dam unit having a dam forming part which encompasses the steel sheet from the end portion of the snorkel part so as to be spaced a predetermined gap from same, and which allows a molten galvanizing solution inside the hot-dip galvanizing bath to flow over toward the inner peripheral surface of the snorkel part so as to prevent the foreign material that falls onto the molten metal surface inside the snorkel part from attaching to the steel sheet; and a molten zinc discharge unit which is provided inside the snorkel part so as to pump, toward the molten metal surface inside the hot-dip galvanizing bath, the molten galvanizing solution having flowed over the dam forming part of the damp unit, thereby preventing the foreign material included in the molten galvanizing solution, having flowed over the dam forming part, from mixing into the molten galvanizing solution inside the hot-dip galvanizing bath and re-polluting the molten galvanizing solution or flowing into the snorkel part again.

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 relates to a ground brush device of vacuum cleaner, which comprise ground brush body and tube joint mounted at the ground brush body. The ground brush body is mounted with dust-collecting port and mounted with dust-collecting passage. The tube joint has internal tube cavity, which is communicated with dust-collecting passage through dust-collecting port. The ground brush device of the vacuum cleaner still comprise water-accumulating box possessing a water-inlet. At least part of water-accumulating box is mounted on ground brush body or tube joint. The water inlet of water-accumulating box is communicated with dust-absorbing passage or tube cavity in tube joint. At normal atmosphere, liquid in tube cavity or dust-collecting passage can flow into water-accumulating box through water inlet, which can prevent reverse flow of absorbed liquid to flowing back to surface to be cleaned, reduce the secondary pollution.

The invention discloses a water-saving discharge system of direct-drink water device, which comprises a water device and family pipeline system. Wherein, the water device comprises a water inlet and a waste water outlet; the family pipeline system comprises a cool water pipe, a hot water pipe, a hot water heating device and several water using devices; the cool water pipe is connected to the city main pipeline via main water inlet pipe and main water inlet valve; and the hot water heating device is in series between the cool water pipe and the hot water pipe. It is characterized in that the water inlet is connected to the cool water pipe via water inlet pipe and waste water outlet is connected to the hot water pipe via waste water outlet pipe. It has the advantages that it has simple structure while it can realize non-waste water discharge.

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.

The invention discloses a refractory heat-preservation structure capable of improving the service life of a clarifying tube, which comprises a bottom brick, a filling layer, side bricks, a glass fluid conveying pipeline, a cover brick and a suspended brick, wherein the bottom brick, the side bricks arranged on the two sides of the bottom brick and the cover brick arranged on the side bricks are commonly enclosed to form a heat-preservation channel; the filling layer is filled in the heat-preservation channel; the glass fluid conveying pipeline is enwrapped by the filling layer; and the suspended brick passes through the cover brick to extend into the filling layer and is not in contact with the glass fluid conveying pipeline. The refractory heat-preservation structure has the advantages that by using the reasonable refractory heat-preservation structure, the situation that a refractory material and a ramming material in contact with the glass fluid conveying pipeline cause the oppression to the clarifying tube due to high-temperature creep is restrained, so that the glass fluid conveying pipeline is protected; and through enhancing the structure at the bottom part, the collapse of the bottom brick and the glass fluid conveying pipeline caused by the creep and other factors of a refractory heat-preservation material at the bottom part is prevented.

The invention discloses a multi-way reversing valve, which includes a reversing valve unit, the oil inlet of the reversing valve unit communicates with the main oil inlet oil circuit, and the oil return port of the reversing valve A hydraulically controlled neutral unloading valve is set between the main oil inlet oil circuit and the main oil return oil circuit, and the control oil port of the hydraulically controlled neutral unloading valve is connected to the reversing valve unit The working oil port of the reversing valve unit is connected; in the neutral state, the oil inlet port of the reversing valve unit is disconnected from the working oil port. The switching of each action of the reversing valve is stable and reliable, the internal structure is simple and compact, the pressure loss is small, and the cost is low.

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 an anti-continuous-treading accelerator valve. The valve comprises an upper cover, a valve body, a lower cover, a valve element and a pedal, the upper cover is fixedly connected with the upper portion of the valve body, the lower cover is fixedly connected with the lower portion of the valve body, the valve element is arranged in the valve body, the pedal is inserted into the upper cover, the top of the valve element is inserted into the pedal, a fixed speed device is arranged on the right side of the pedal, an output port is formed in the left side in the valve body, an input port is formed in the lower right side in the valve body, an oil return port is arranged above the input port, a second oil hole is formed in the left side of the input port, a first oil holeis formed in the valve element, the left side of the oil return port is connected with a third oil hole, and the fixed speed device is arranged in the valve element. A driver does not need to tread anaccelerator all the time, and when the driver needs to stop a car, the driver only needs to slightly tread the accelerator or tread a brake, so that the burden of the driver is greatly reduced. The pedal stays still for a period of time after being trod, the pedal can be automatically fixed, the pedal is stopped being fixed after being trod again, and the operation is simple and convenient.