560results about How to "Reduce pressure difference" patented technology

A board processing apparatus and a method of fabricating a semiconductor apparatus for reducing a pressure difference between a preparing chamber and a processing chamber and restraining a rapid flow of a gas caused by the pressure difference to thereby prevent a board from being contaminated by a particle are disclosed.

A pressure and a vision regulation method and device for irrigation of a body cavity (1), in which method an inflow liquid pump (2) pressurizes the irrigation liquid in a feed line (13) and in which an outflow device (3) or an external suction source (20) drains the irrigation liquid from the body cavity (1) through a tubing (16) into a waste container (17) and in which a control unit (4) controls either the inflow liquid pump (2) only or both the inflow liquid pump (2) and the outflow device (3) depending on an inflow irrigation liquid pressure from a pressure sensor (5), where the first control unit (4) compares the inflow irrigation liquid pressure and flow with pressures calculated to correspond to pressure in the body cavity for the respective flow for a nominal surgical site and that a matching between the calculated values and the inflow irrigation liquid pressures is made by altering the effect of either the inflow liquid pump (2) only or the inflow liquid pump (2) and / or the outflow device (3) and / or the shut off valve. The above-mentioned pressure registration method and the device for irrigation of a body cavity is combined with an method for detecting blood cells, red blood cells, haemoglobin and / or debris in liquid coming from a surgical site so an automatically control and rinsing system is achieved keeping a clear vision in the viewing area of the operational site.

The present invention relates to a high-pressure fluidized bed reactor for preparing granular polycrystalline silicon, comprising (a) a reactor tube, (b) a reactor shell encompassing the reactor tube, (c) an inner zone formed within the reactor tube, where a silicon particle bed is formed and silicon deposition occurs, and an outer zone formed in between the reactor shell and the reactor tube, which is maintained under the inert gas atmosphere, and (d) a controlling means to keep the difference between pressures in the inner zone and the outer zone being maintained within the range of 0 to 1 bar, thereby enabling to maintain physical stability of the reactor tube and efficiently prepare granular polycrystalline silicon even at relatively high reaction pressure.

The invention relates to a proton exchange membrane fuel cell bipolar plate, in particular to a tree-structured flow field proton exchange membrane fuel cell bipolar plate. The bipolar plate comprises an anode plate, a cathode plate and a support frame, wherein the anode plate and the cathode plate are fixedly connected through the support frame which is positioned between the anode plate and thecathode plate; an anode flow field is arranged on the left side face of the anode plate; and a cathode flow field is arranged on the right side face of the cathode plate. The bipolar plate is characterized in that: the two end parts of the anode flow field and the cathode flow field are tree-structured flow fields and the middle parts are parallel flow fields. The bipolar plate can improve the property and stability of a fuel cell.

The invention relates to a method for cleaning a reverse osmosis system. The method comprises a step of cleaning a reverse osmosis membrane by using reverse osmosis system cleaning liquid, wherein the cleaning liquid is cleanser-containing aqueous solution; the pH value of the cleaning liquid is controlled to be 11.0+ / -0.5; the cleanser consists of a chelating agent, an anionic surfactant and a polymer dirt dispersion agent; the chelating agent is at least one selected from polyphosphates and ethylenediamine tetraacetic acid; the anionic surfactant is at least one selected from C8-C16 alkylbenzene sulfonate and N-oleoyl-N-methyl taurine; and the polymer dirt dispersion agent is at least one selected from acrylate homopolymer and acrylate copolymer. By cleaning the reverse osmosis membrane with the method provided by the invention, the problems of colloid, organic and microbial pollution and the like which slowly occur on the reverse osmosis membrane can be intensively solved; the salinity of water produced by the reverse osmosis system can be effectively reduced; the water yield of the reverse osmosis system can be increased; and the pressure difference before and after the reverse osmosis membrane can be reduced.

The invention relates to a partial pressure sintering method for sintering a neodymium-iron-boron magnet. Certain inert gases Ar are filled into various deflation sections in the sintering process, the pressure of the Ar gases inside a furnace is regulated according to blank deflation velocity and vacuum pump system exhaust velocity through vacuum degree control, so that heating sintering is carried out by uniformly deflating under different partial pressures of the Ar gases, and negative pressure is still kept. The partial pressure sintering method disclosed by the invention ensures the consistency and uniformity of magnetic property and saves the sintering time.

The present invention relates to a gas-storage power plant, comprising a gas reservoir (8) in which a gas can be stored under pressure, a turbogroup (2) which has at least one turbine (3, 5), a gas-supply line (9) which leads from the gas reservoir (8) to the turbogroup (2), and a valve arrangement (12) which is arranged in the gas-supply line (9) and throttles a storage pressure (PS) applied on the inlet side to a working pressure (PA) by closed-loop and / or open-loop control. In order to improve the reliability of the valve arrangement (12), it has at least two control valves (13, 14) arranged in series. A leading first control valve (13) throttles the storage pressure (PS) applied on the inlet side to an intermediate pressure (PZ) by closed-loop or open-loop control. A subsequent second control valve (14) throttles the pressure (PZ) applied on the inlet side to the working pressure (PA) by closed-loop control.

This invention relates to a neuron network runner dual-pole plate used in PEM fuel batteries, one side of the pole plate is set with a cathode flow field for transmitting oxidizer gas, the other side is set with anode runners for transmitting fuel, inlets and outlets of gas and cooling fluid are set on the pole plate, a flow field transition region and a flow field reaction region set in it and connected with it are placed near the gas inlet / outlet, in which, the runners of the transition region are in the structure of a multi-channel neuron network., the length of runners in the field and the flowing resistance of gas in the runners are almost the same so it is favorable for gas flowing in the field uniformly.

The invention discloses a pressure expander of a centrifugal compressor. The structure of the pressure expander is improved, and high application value is achieved for further improving working performance of the pressure expander. A short blade is arranged in runners of every two adjacent long blades; the front edges of the long blades are curved surfaces and are arranged obliquely, and the included angles between front edge lines and the central axis of a wheel disc are 6 degrees to 8 degrees; the radius of curvature of the front edges of the long blades is gradually increased from the wheel disc to a wheel cover; each long blade is provided with three broken-line-shaped channels penetrating through a corresponding pressure surface and a corresponding suction surface; tail edge wing tips are arranged on the portions, located on the pressure surfaces, of the rear edges of the long blades. Occurrence of separation of airflow on the surfaces of the blades is restrained through the short blades in the runners of the adjacent long blades; the pressure differences between the pressure surfaces and the suction surfaces are reduced through the broken-line-shaped channels, the adverse pressure gradient is reduced, and separate airflow on boundary layers of the suction surfaces at the tails of part of the blades is effectively blown away; increase of wing tip vortexes generated by the pressure differences between the suction surfaces and the pressure surfaces on the rear edges of traditional wing-type blades can be restrained through parabola-shaped winglets on the tail edges.

The invention belongs to a turbine blade of a blade top rib wing structure, and particularly relates to a novel turbine movable blade top structure. The turbine blade of the blade top rib wing structure comprises a blade pressure surface side small wing and a blade suction force side small wing, wherein a cavity in the middle of the blade top is formed between the blade pressure surface side small wing and the blade suction force side small wing. A front edge approaching point is formed in the blade front edge position of the blade pressure surface side small wing, and a rear edge point is formed in the blade front edge position of the blade pressure surface side small wing. A front edge approaching point is formed in the suction force surface front edge position of the blade suction force side small wing, and a rear edge point is formed in the blade front edge position of the blade pressure surface side small wing. The maximum width of the suction force side small wing is between C and D. The turbine blade of the blade top rib wing structure has the advantages that through the special geometrical shape, flow around the blade top is controlled, and accordingly the leaking flow of the blade top is lowered, the efficiency of a turbine is improved, and the output power of the turbine is increased; in addition, the heat transfer performance of the blade top of the turbine is improved, and the service life of the turbine is prolonged.

The invention discloses a high-pressure piston type accumulator, relating to the technical field of hydraulic auxiliary elements and solving the technical problem of prolonging the service life and enhancing the working pressure. The high-pressure piston type accumulator comprises a cylinder barrel, a piston arranged in the cylinder barrel, and an oil lateral connecting flange and a gas lateral connecting flange which are respectively fixed on the both ends of the cylinder barrel, wherein an oil hole is arranged on the oil lateral connecting flange; a charging nozzle is arranged on the gas lateral connecting flange; a circle of guide belt grooves, a circle of oil storage grooves, a circle of seal grooves, a circle of gas storage grooves and a circle of guide belt grooves are axially and successively arranged on the piton; guide belts are arranged in both two guide belt grooves; combined sealing elements are arranged in the seal grooves; a one-way valve is respectively arranged on the both ends of the piston; an inlet of one one-way valve is communicated with the gas storage grooves on the cylindrical surface of the piston, and an outlet of the one-way valve is communicated with an oil cavity; and an inlet of the other one-way valve is communicated with the gas storage grooves on the cylindrical surface of the piston, and an outlet of the one-way valve is communicated with a gas cavity. The accumulator can effectively avoid oil liquid from leaking into the gas.

The invention relates to a refrigerator door gasket which comprises a door gasket body, wherein a magnetic strip chamber and air bags are arranged in the door gasket body; a magnetic strip is arranged in the magnetic strip chamber; vents communicating the inside of the refrigerator body with the outside of the refrigerator body are formed in the air bags; and an air catch is arranged on the door gasket body, and enables the vents to be in a communicated or blocked state when the refrigerator door body is opened or closed. According to the technical scheme, the vents and the air catch are arranged on the door gasket body, therefore, when the refrigerator door body is closed, the air catch can block the vents, the air inside the refrigerator body is isolated from the air outside of the refrigerator body, and the refrigeration effect of the refrigerator is guaranteed; and when the refrigerator door body is opened, the door gasket is stretched, the air catch enables the vents to be communicated, the air outside the refrigerator body enters the refrigerator body through the vents, the difference between pressure inside and outside the refrigerator is reduced, meanwhile, the external air pressure received by the refrigerator door body is reduced, and the refrigerator door body can be opened easily.

An outside gas type accumulator has a mechanism for reducing the pressure difference occurring when liquid confined in a liquid chamber and gas filling the liquid chamber in zero-down state expand thermally, and restrains abnormal deformation of a bellows by reducing the pressure difference between the inside and outside of the bellows. A pressure difference regulation mechanism (21) reduces the pressure difference occurring when liquid confined in the liquid chamber (11) and gas filling the liquid chamber in the zero-down state expand thermally. The regulation mechanism (21) has a movable plate (22) supported by a coil spring (23) on the oil port (4) side of a bellows cap (8). During normal operation, the plate (22) moves together with the cap (8) by being supported by the spring (23), and the plate (22) moves together with the cap (8) and to be brought into contact with a seal (13) in the zero-down state. When the liquid and the filling gas expand thermally, the plate (22) maintains contact with the seal (13), and the cap (8) moves up to a position where the liquid pressure and the gas pressure are balanced while compressing the spring (23).

Provided is an accumulator, which: is capable of reducing the pressure difference that is generated by differences in coefficients of thermal expansion when liquid trapped in the liquid chamber and a sealed gas undergo thermal expansion during zero-down, thereby limiting the occurrence of plastic deformation in the bellows; and has a structure in which the parts are small and few in number. To achieve said purpose, the accumulator has a sealing member held on the port hole-side of the bellows cap via a seal holder. When operation of the machine is stopped and the pressure inside the pressure piping decreases, the sealing member contacts the sealing section and closes the liquid chamber. If liquid trapped in the liquid chamber when the liquid chamber is closed undergoes thermal expansion, the bellows cap moves in the direction away from the sealing section while the sealing member is still in contact with the sealing section. Since the sealing member is a rigid plate, the outer circumferential surface of which is covered by a flexible section obtained from a rubber-like elastic body, the flexible section allows relative movement of the bellows cap by undergoing shear deformation as a result of engagement with the seal holder.

Provided is a diving instrument buoyancy control and pressure compensation system and method, the system includes a shell body, the inside of the shell body is filled with gases with a certain compressive stress, the shell body is provided with two and above elastic gasbags, the insides of the elastic gasbags are filled with gases with a certain compressive stress, and through a protective shell with holes wrapping on the outsides of the elastic gasbags, are in contact with the inside and outside of the shell body, the stresses of the filled gases inside every elastic gasbag are all different, and the gas stress inside the shell body is lower than the gas stress inside the elastic gasbag; the inside of the shell body is provided with an elastic water bag, a two-way seawater hydraulic pressure pump and a seawater electric magnetic valve, and the elastic water bag through the above two-way seawater hydraulic pressure pump and the seawater electric magnetic valve is through connected with a water environment outside the shell body in order to conduct water transmission among each other; the inside of the shell body is also provided with a motor connected with the two-way seawater hydraulic pressure pump, the motor controls the control system of the motor and the seawater electric magnetic valve in operations and the electric power supply for supplying electricity to every installation inside the shell body. The disclosed diving device buoyancy control and pressure compensation system, wherein the buoyancy control is converted from a closed form oil hydraulic pressure to an open form sea water hydraulic pressure, expands the scope of the buoyancy control, and increases the reliability and compatibility with environment.

The invention discloses a protecting structure for a vacuum air extinguish chamber corrugated pipe under high gas pressure and application. The protecting structure comprises a hollow metal drum and a corrugated pipe outside sealing device, the hollow metal barrel is arranged at the end, positioned outside a vacuum arc extinguish chamber movable end cap, of a vacuum arc extinguish chamber movable electroconductive rod, one end of the corrugated pipe outside sealing device is arranged on the lower portion of the vacuum arc extinguish chamber movable end cap while the other end of the same is arranged outside the circumference of the hollow metal barrel, the hollow metal barrel and the vacuum arc extinguish chamber movable electroconductive rod are in welded sealing, the hollow metal barrel and the corrugated pipe outside sealing device are in direct-acting reciprocating sealing, and the corrugated pipe outside sealing device and the vacuum arc extinguish chamber movable end cap are in fixed gas sealing. By adopting magnetofluid direct-acting reciprocating sealing technology, a closed space can be formed among the inside of the vacuum arc extinguish chamber corrugated pipe, the lower portion of the vacuum arc extinguish chamber movable end cap and the movable electroconductive rod, and no high-pressure gas exists inside the closed space, so that difference of air pressure inside and outside the corrugated pipe is reduced, and breakage failure probability of the corrugated pipe can be lowered effectively.

The invention relates to a food preservation processor, comprising a control circuit, a container, a stirring device arranged in an inner cavity of the container, a motor for driving the stirring device, and an air extractor for extracting air in the container; the container is provided with an opening which is provided with a seal cover, and the air extractor and the motor are electrically connected with the control circuit; the air extractor refers to an air extractor that is characterized in that after the seal cover seals the opening of the container and the air extractor is started, the inner cavity of the container is kept to be -81 to -99 Kpa in relative vacuum degree within a certain time; the air extractor is provided with an extraction port and an exhaust port, the extraction port leads to a closed space that is above the inner cavity of the container and communicated with the inner cavity. The air extractor with better extracting performance is used in the food preservation processor in order to ensure that the closed space may gain a high anti-oxidization level, and it is at least ensured that food in the container is kept fresh and non-oxidized as usual within half an hour after processing.

An outer gas type or inner gas type accumulator is provided with a mechanism for reducing a pressure difference generated when liquid and gas confined in a liquid chamber at the time of a zero-down state is expanded thermally. The mechanism reduces the pressure difference between the inside and outside of a bellows to suppress abnormal deformation of the bellows. A movable plate supported by spring means is provided on the bellows cap side of an oil port. In normal operation, the movable plate is supported by the spring means and separated from a seal. In a zero-down state, the movable plate is pushed by the bellows cap and makes contact with the seal while elastically deforming the spring means. When the liquid and gas confined in the liquid chamber in the zero-down state is expanded thermally, the bellows cap moves, with the movable plate being in contact with the seal, up to a position at which the liquid pressure and the gas pressure balance each other.

A jet aircraft with integrated, rotary sonobuoy launch system has storage racks for a number of sonobuoys in sonobuoy launch containers; and one or more launcher units in its cabin. Each launcher unit has a pressure shell with a door allowing loading of sonobuoys in sonobuoy launch containers from the storage racks. With the door closed, the inside of the shell can be depressurized for launching a sonobuoy by opening a gate valve that connects the interior of the shell to the exterior of the aircraft. With the gate valve closed, the shell can pressurized so that the door can be opened and sonobuoys reloaded. A control system can be used to rotate a rotary launcher inside each pressure shell so that a selected sonobuoy is moved to a launch position above the gate valve and a launch tube, and a pneumatic system can be used to launch the sonobuoy.

The invention discloses an optical fiber mini-sized hydrophone belonging to a sound pressure sensor technology field. The optical fiber mini-sized hydrophone comprises a four-layer structure. A first layer is a diaphragm, which is a PDMS flat diaphragm or a PET convolution diaphragm. A second layer is a first supporting layer having a circular through hole in a center, and a third layer is the second supporting layer having the circular through hole in the center. The fourth layer is the third supporting layer having a circular through hole in the center and an air vent hole in an edge. The center of the diaphragm, the center of the first supporting layer, the center of the second supporting layer, and the center of the third supporting layer are sequentially aligned with each other, and are bonded together. The diameter of the circular through hole of the first supporting layer, the diameter of the circular through hole of the second supporting layer, and the diameter of the circular through hole of the third supporting layer are reduced sequentially, and the above mentioned circular through holes of the supporting layers are in a ladder-shaped arrangement. An inserting core is disposed in the circular through hole of the third supporting layer, and an optical fiber is inserted in the inserting core. An F-P cavity is arranged from the diaphragm to the end surface of the optical fiber. The optical fiber mini-sized hydrophone is used to solve technical problems caused by the materials or the shapes of the diaphragms.

The invention discloses a motor driven CVT (continuously variable transmission) electro-hydraulic control system comprising a driving wheel hydraulic cylinder, a driven wheel hydraulic cylinder, a speed ratio control loop and a clamping force control loop, wherein the speed ratio control loop and the clamping force control loop are connected in parallel on the driving wheel hydraulic cylinder andthe driven wheel hydraulic cylinder. The speed ratio control loop and the clamping force control loop are connected in parallel on two main oil ways of the driving wheel hydraulic cylinder and the driven wheel hydraulic cylinder, respectively control speed ratio and clamping force, are associated with each other without interference and can realize the accurate regulation of any speed ratio and clamping force within a specified range; because a direct current motor is used for driving a CVT hydraulic pump to work, throttle loss, overflow and unloading loss are avoided; and in addition, betterideal power matching of the motor and the hydraulic cylinders of an execution component can be obtained. Moreover, the control system has the advantages of long service life, high reliability, low production cost, small size and light weight and can realize high integration.

The invention discloses a membrane servo valve driven by piezoelectric ceramics. The membrane servo valve comprises an upper valve body and a lower valve body, wherein a membrane is arranged between the upper valve body and the lower valve body; a cylindrical balancing oil cavity is formed between the upper valve body and the membrane; a ring-shaped throttling oil cavity is formed between the membrane and the lower valve body; the balancing oil cavity and the throttling oil cavity are communicated with each other; an ejector rod vertically penetrates through a space between the upper valve body and the balancing oil cavity; one end of the ejector rod is arranged with a set spacing distance to the membrane, or in contact with the membrane; one of the piezoelectric ceramics used for pushing the ejector rod to move is arranged at the other end of the ejector rod. The membrane servo valve has the benefits that through precise control of a throttling interval, the pressure and the flow can be precisely and actively controlled; the center of the membrane is set to be a central island shape, the central island shape is rigid, and a deformation zone around the central island shape is flexible, so as to improve the dynamic frequency of the membrane; meanwhile, the throttling interval control precision is improved, and the whole membrane servo valve is simple in structure, reliable in function and low in manufacturing cost.

The invention relates to a silencer with a balancing chamber, which consists of a silencer cavity, a cavity sealing cover, and an internal communicating pipe. The cavity sealing cover is fixed on the silencer cavity; the internal communicating pipe is clamped in a cavity formed after the fixation of the silencer cavity and the cavity sealing cover; one side of the silencer cavity is provided with an air suction port; the lower bottom of the silencer cavity is provided with an oil leakage hole; the cavity sealing cover is provided with an air outlet; and one end of the internal communicating pipe is communicated with the air suction port, while the other end is communicated with the air outlet, wherein the balancing chamber is separated in the silencer cavity on the other side of the air suction port of the silencer cavity through a partition, a lower bottom plate in the balancing chamber is provided with a balancing hole, and the balancing chamber is communicated with the silencer cavity. The silencer has a simple integral structure as well as scientific and reasonable design, can effectively reduce the negative pressure in the silencer cavity during the air suction of a compressor, reduce the whole noise of the compressor, and improve the stability of the compressor, and has higher novelty and is provided with the balancing chamber.

The invention discloses a refrigerator power-assisted door handle assembly and a refrigerator, and relates to the technical field of refrigerators. The refrigerator power-assisted door handle assembly is invented in order to solve the problem that when users use an existing refrigerator handle assembly to eject a refrigerator door away from a refrigerator body, a large amount of labor can be consumed. The refrigerator power-assisted door handle assembly comprises a support, a handle, a connecting rod mechanism and a reset piece. One end of the handle in the width direction is hinged to the support through a rotating shaft, and the other end of the handle is a hand-pulling end. The connecting rod mechanism comprises a first connecting rod, a second connecting rod and an ejector rod. The first end of the first connecting rod is connected with the handle, and the second end of the first connecting rod is hinged to the first end of the second connecting rod. The second end of the second connecting rod abuts against the first end of the ejector rod, and the middle part of the second connecting rod is hinged to the support. The ejector rod can slide linearly relative to the support. The second end of the ejector rod is used for abutting against the refrigerator body of the refrigerator, and the distance from the hand-pulling end of the handle to the rotating shaft is larger than the distance from the connecting point of the handle and the first connecting rod to the rotating shaft. The reset piece is used for applying reset force to the handle. The refrigerator power-assisted door handle assembly can be used in refrigerator power-assisted doors.

A window or a wall is made, an air passage channel (10) passing through the window or the wall is made, at least one resonance chamber (r1, r2, and r3) is disposed near the air passage channel (10), and the air passage type channel and the resonance chamber are separated from each other by a porous sound absorbing material (30). When sound and air pass through the air passage type channel (10), the sound is absorbed and blocked by the resonance chambers (r1, r2 and r3), and the air passes through the air passage type channel (10). Using this, the air passage type soundproof window or soundproof wall by which air passes therethrough and sound is blocked can be manufactured, and using the same principle, the water passage type soundproof window and soundproof wall by which water passes therethrough and sound is blocked can be manufactured. The present invention can be applied to various industrial fields in which noise is generated by an air blower, and can be used for constructing a quiet ecological environment of epibenthos.

The invention discloses a power device for achieving dual-side heat dissipation and pressure equalization. By arranging a conductive contact sheet provided with a plurality of concave pool structures,the power device is divided into two parts to achieve dual-side heat dissipation; and by mechanical connection of spring pieces and concave parts of the concave pool structures, the concave part of each concave pool structure is sequentially connected with an upper molybdenum sheet, a chip, a lower molybdenum sheet, a silver cushion, a boss and a conductive substrate from top to bottom, so that each spring piece and each chip are independent to each other, the stress of the chip can be reduced through generating upward displacement by the corresponding spring piece when thermal stress appliedto one of the chips due to difference of structure or thermal expansion becomes larger, the other chips and other springs are not affected, and the stress balancing degree of the chip is improved. With the power device provided by the invention, the problem of low reliability of a power device package structure caused by poor heat dissipation performance and non-uniform bearing stress to an internal chip of a traditional power device package structure can be solved.

A braking pedal feel simulating device of an automobile brake-by-wire system comprises a braking pedal, a pedal controlling arm, a pedal shaft, a pedal fixing support, a torsion spring, a pedal angle displacement sensor, a pedal force sensor and a pedal feel simulator. The braking pedal is fixedly connected with the pedal controlling arm, a round hole is processed at the upper end of the pedal controlling arm which is rotatably connected with the pedal shaft, the pedal shaft is mounted in a mounting hole of the pedal fixing support, a guide small hole is formed in the pedal fixing support, the diameter of the guide small hole is in interference fit with the outer diameter of a pushing rod, the torsion spring is cylindrical and is sleeved on the pedal shaft in a hollow manner, one end of the torsion spring is fixedly connected on the pedal fixing support while the other end of the same is connected on the pedal controlling arm, the torsion spring reverses and generates spring force along with rotating of the pedal controlling arm, the pedal angle displacement sensor is mounted in the round hole at the upper end of the pedal controlling arm, the pedal force sensor is mounted on the braking pedal, and the front end of a pushing rod of the pedal feed simulator is rotatably connected with the pedal controlling arm.