65results about How to "Effective pressure control" patented technology

The invention provides a chamber pressure control method, which comprises: step 100, acquiring air delivery target flow required when a chamber is in a target pressure according to a corresponding relationship between the pressure of the chamber and the air delivery flow; and step 200, setting the air delivery target flow as a flow setting value of a mass flow controller, wherein the mass flow controller implements air delivery operation on the chamber based on the flow setting value and controls the pressure of the chamber within the target pressure range. The method for controlling the pressure of the chamber also comprises a step of acquiring the corresponding relationship between the pressure of the chamber and the air delivery flow. In addition, the invention also provides a chamber pressure control device, a chamber pressure control system using the method and the chamber pressure control system using the device. An expensive pressure control valve is replaced by adopting the cheaper mass flow controller and the simple control step, and the cost of the process/equipment is saved while effectively controlling the pressure of the chamber.

The invention relates to a flowability testing method and a device for a zirconium base block amorphous alloy melt. The method mainly comprises the steps that a medium-frequency induction vacuum melting furnace and an alumina ceramic crucible are adopted for alloy melting, the flowability testing device for the block amorphous alloy melt conducts suction casting on the molten block amorphous alloy melt under technological conditions of different temperatures, different pressures and different circular pipe diameters, block amorphous alloy cast rods in different flow lengths are obtained, and the flowability of an alloy can be known through the lengths of the amorphous alloy cast rods. According to the method and the device, the temperature of the block amorphous alloy melt and the pressure in a furnace body can be effectively controlled, the zirconium base block amorphous alloy cast rods in different diameters and different lengths can be subjected to suction casting simultaneously under the same technological condition, and the testing efficiency is high.

The invention discloses an automatic water supplementing steam generating device comprising a water tank assembly, a steam generator, a steam pot, a heating body and an anti-burning device. The water tank assembly is flexibly arranged above a water tank seat, the steam generator is fixedly arranged above the water tank seat, the heating body is arranged under the steam pot, the lower end of the water tank is provided with a water outlet valve, the water outlet valve is communicated with the lower end of the steam pot through a connecting pipe, and the connecting pipe is arranged in the water tank; the end of the connecting pipe connected with the water outlet valve is provided with a water inlet valve, the water inlet valve is mutually matched with the water outlet valve, the upper end of the steam pot is communicated with the inner upper end of the water tank of the water tank assembly through an air pressure balance pipe. By the application of the automatic water supplementing steam generating device, automatic water supplementing is achieved, water pumps are omitted, and cost is effectively decreased; by the arrangement of an automatic decompression device and an anti-dry burning temperature sensor, the performance of safety use is high, the pressure of steam outputting is adjustable and potential risk is eliminated effectively by the arranged anti-burning device.

The invention discloses a construction method of an earth pressure balance shield tunneling machine muck pressure maintaining pumping device. Before an earth pressure balance shield tunneling machine is tunneled into a stratum which is high in water permeating performance or high in requirement for sedimentation controlling, the soil outlet of the earth pressure balance shield tunneling machine is connected with a pressure maintaining pumping device body, bentonite or foam and others used for preventing gushing is added to a soil bin to carry out muck improvement in the pumping process, the pressure in the soil bin of the earth pressure balance shield tunneling machine can be effectively controlled by controlling the discharge capacity of the pumping device body, gushing or poor sedimentation controlling and other situations are avoided, the earth pressure balance shield tunneling machine can have the functions of an earth pressure shield and a slurry shield and is especially suitable for requirement of composite stratum construction, the requirement of stratum construction with different conditions can be met conveniently and quickly, and therefore the construction difficulty is greatly lowered, the construction cost is greatly reduced, and the construction safety is greatly improved.

The invention discloses a parallel-tube snubbing pulverized coal discharging system for a coal-bed gas well and belongs to the technical field of coal-bed gas well and oil-gas field development. The system comprises a ground portion and a down hole portion. The ground portion comprises a solid-liquid separation unit (12), a pump truck (1), a parallel-tube self-sealing unit (15), a parallel-tube well head unit (14), an air blower (2) and a coal-bed gas recovery unit (3). The down hole portion comprises a first oil tube (7), a second oil tube (18) and a parallel-tube hydraulic jet pulverized coal flushing unit (8). The ground portion is a control mechanism of the system, and the down hole portion is an execution mechanism of the system. The invention further discloses a parallel-tube snubbing pulverized coal discharging method for the coal-bed gas well, which uses the system. By means of the system, continuous pulverized coal discharging can be achieved, the current well repair efficiency is improved, and the stability of pressure of coal-bed gas in the well and the operation safety can be guaranteed during the operation.

The invention provides an elevating platform fire truck and a control system of a landing leg vertical oil cylinder of the elevating platform fire truck. The elevating platform fire truck can relieve hydraulic vibration and abnormal noise produced in a high-pressure oil flow direction switching process. The control system comprises a control valve provided with an oil inlet and an oil return port, wherein the control valve is communicated with a rod cavity of the landing leg vertical oil cylinder through a first work oil port of the control valve, a second work oil port is communicated with a rodless cavity of the landing leg vertical oil cylinder, the control system further comprises a decompression oil line making the rodless cavity of the landing leg vertical oil cylinder be communicated with an oil box, the decompression oil line is provided with a throttling element and a decompression valve, and the decompression valve has two work positions used for enabling the decompression oil line to be communicated and disconnected. When landing legs need to be taken back, the decompression valve is controlled to be opened firstly, the decompression valve is in a communicated state, part of high-pressure oil in the rodless cavity can be discharged into the oil box through the throttling element, part of deformation of the oil cylinder caused by locking high pressure can be restored, pre-decompression of the oil cylinder is achieved, and the hydraulic vibration and the noise are avoided.

A thickened oil thermal recovery decompression method is suitable for thickened oil thermal recovery of mesohigh steam boilers and mesolow steam boilers, and a heat source for thermal recovery can supply steam through a decompression device. A decompression system of the thermal recovery decompression device is composed of a high-pressure area decompression valve and a medium-pressure area secondary decompression valve, and due to the two-stage decompression structure, the thickened oil thermal recovery decompression device is suitable for various work conditions of thickened oil thermal recovery. Mesohigh steam output pipes which are controlled by the valve and parallelly connected are arranged behind the high-pressure steam decompression valve, steam discharging pipelines for enabling steam of the mesohigh steam boilers to pass are arranged on the high-pressure steam decompression valve or the medium-pressure area secondary decompression valve, and the thickened oil thermal recovery decompression device can be steam driven or low-pressure steam driven or hot water driven. The thickened oil thermal recovery decompression device can monitor steam pressure in the steam pipelines at proper time, is convenient to operate, and can ensure safety of steam filling pipelines and steam utilization devices by arranging two check valves on steam inlet portions of the steam pipelines and placing a check valve on a steam discharging port portion.

The invention discloses a device and a method for hydraulically measuring concrete demoulding performance. In an existing way of effectively and completely separating a test specimen from a concrete testing mould manually through an inflating pump, precise control and monitoring of air pressure change cannot be achieved, and equipment used for cooperating with the method is complicated and is highin cost. In the device, a first mounting cover and a second mounting cover are vertically arranged in parallel; a concrete mould is arranged between the first mounting cover and the second mounting cover; the two ends of the concrete mould are detachably connected with the first mounting cover and the second mounting cover; concrete is arranged inside the concrete mould; one end of a middle component runs through the first mounting cover and is communicated with the concrete in the concrete mould; the other end of the middle component is communicated with an oil outlet of a hydraulic pump through a connecting pipe. The device is reasonable in structural design, timely, accurate and effective in measurement result and convenient to operate. The method is convenient to operate and easy to control. The device and the method are used for measuring the concrete demoulding performance.

The invention discloses a one-way valve which comprises a valve body, a valve core, an adjusting knob and a spring and is characterized in that the valve body is provided with an inlet, an outlet and an unloading port which are communicated with the valve cavity respectively. The valve core is arranged in the valve cavity, the tail portion of the valve core is connected with the spring, the other end of the spring is connected with the adjusting knob, and the adjusting knob is connected with the valve body. The one-way valve is adjustable in opening pressure, has an overflowing effect and effectively controls pipeline pressure.

The invention discloses a negative pressure drainage system capable of achieving a self-circulation; the negative pressure drainage system can generate a continuous liquid shearing force in the position of a wound surface, so as to accelerate the union of the wound surface. The negative pressure drainage system comprises a medical dressing, a waste liquid bottle, a vacuum pump, an A liquid conduit, an A air conduit, a B liquid conduit, a peristaltic pump, a C liquid conduit, an infusion bottle, an E liquid conduit, an a control valve, a B control valve and an F control valve, wherein the medical dressing, the B liquid conduit, the peristaltic pump, the C liquid conduit and the infusion bottle are sequentially connected. The medical dressing, the A fluid conduit, the waste liquid bottle, the A air conduit and the vacuum pump are sequentially connected. The E liquid conduit is connected between the C liquid conduit and the A liquid conduit. The A control valve is installed on the A liquid conduit; and the connection point between the E liquid conduit and the A liquid conduit is located between the A control valve and the medical dressing. The B control valve is installed on the C liquid conduit; and the connection point between the E liquid conduit and the C liquid conduit is located between the B control valve and the peristaltic pump. The F control valve is installed on the E liquid conduit.

The invention belongs to the technical test field of the fuel injection system of an aerospace engine, and in particular relates to a swirler air flow test bench for a fuel nozzle. It includes an external air source mechanism, a working chamber and an exhaust chamber connected in sequence through the air pipe; the air pipe between the external air source mechanism and the working chamber is provided with a stop valve, an oil-gas separator, a regulating valve, a rotameter, A primary pressure fine-tuning assembly and a first pressure gauge; a secondary pressure fine-tuning assembly is provided on the air pipe between the working chamber and the exhaust chamber; a second pressure gauge is provided on the working chamber; the primary pressure fine-tuning The assembly includes a first-stage regulating valve and a first-stage high-precision fine-tuning regulating valve arranged in parallel; the second-stage pressure fine-tuning assembly includes a second-stage regulating valve and a second-stage high-precision fine-tuning regulating valve arranged in parallel. The present invention also relates to a method for conducting tests using the above-mentioned test bench.

The invention discloses a large-diameter ultra-deep high-pressure jet grouting construction method. The construction method is characterized by comprising the following steps: adopting a hole guidingdrilling machine to guide a hole at a point to be grouted; after hole formation, lowering a drilling tool of a rotary jet machine to the bottom of the hole, wherein the lower end of the drilling toolis provided with a water cutting section and a spraying section, and the water cutting section is located on the upper portion of the spraying section; operating the rotary jet machine, lifting the drilling tool by rotating and enabling the water cutting section to spray high pressure water flow to the outside to cut a soil body surrounding the drilling tool into slurry, and the spraying section sprays cement slurry to the outside to form a rotary jet grouting pile around the drilling tool. The method has the advantages that the water cutting section is arranged to dilute the surrounding slurry, a reversing section is synchronously arranged, and a special slurry discharge pipe is utilized to conduct centralized slurry discharge. While slurry discharge is conducted efficiently, the internalpressure is effectively controlled, the grouting and pile formation quality is ensured, and the effect on the surrounding environment is small.

The invention discloses a cooking device.The cooking device comprises: a cooking cavity which is communicated with a steam generator and is movably connected with an opening and closing door; a valve piece which comprises a flow inlet and a flow outlet, wherein the flow inlet is communicated with the bottom wall of the cooking cavity; and a flow collecting container which is communicated with the flow outlet and also comprises a water outlet, wherein the water outlet is connected with a first valve body, and the first valve body is suitable for discharging water in the flow collecting container. The valve piece is arranged on the cooking cavity, opening and closing of the valve piece can be controlled according to the pressure intensity in the cooking cavity on the side of the flow inlet and the pressure intensity difference on the side of the flow outlet, the flow collecting container is communicated with the first valve body and the flow outlet, and the pressure intensity on the side of the flow outlet can be effectively controlled by controlling work of the first valve body, so that opening and closing of the valve part can be effectively controlled, high-pressure steam in the cooking cavity can be conveniently discharged, a user is prevented from being scalded when opening the opening and closing door, and meanwhile accumulated water in the cooking cavity can be effectively removed.

The invention discloses a control valve integrated with functions of pressure reducing, pressure maintaining and separating and the application thereof. The control valve comprises a main valve body, a main valve cover, a control valve cover, a pressure maintaining control valve and a pressure reducing control valve, wherein the main valve cover is arranged on the main valve body, a main control valve diaphragm is arranged between the main valve cover and the main valve body, and a main valve control cavity is formed between the main control valve diaphragm and the main valve cover; the control valve cover is arranged on the main valve cover, the pressure maintaining control valve and the pressure reducing control valve are both arranged on the control valve cover, the main valve body is provided with a water inlet, a water outlet and a main control valve core which is used for controlling the switching on and off of the water inlet and the water outlet, a pressure maintaining passage which leads to the pressure maintaining control valve is arranged in a position, which is close to the water inlet, of the main valve body, the pressure maintaining passage is communicated with the main valve control cavity, and a pressure reducing passage which leads to the pressure reducing control valve is arranged in a position, which is close to the water outlet, of the main valve body. The control valve disclosed by the invention is integrated with the functions of pressure reducing, pressure maintaining and separating and can be applied to a direct-connection heating device.

The invention provides a downhole fracturing method. The downhole fracturing method comprises the steps that a downhole sand-oil blender is put into a fractured interval through an oil tube to form an oil tube channel; propping agents are injected into the fractured interval through the oil tube channel, and quick water is injected into the fractured interval through an oil jacket annulus channel; and the displacement of high-sand-ratio sand-carrying fluid injected into the fractured interval through the oil tube channel and displacement of quick water injected into the fractured interval through the oil jacket annulus channel are controlled periodically, so that a propping agent bridge is formed in a crack of the fractured interval within a first preset time of one cycle, the propping agent bridge is released within a second preset time of one cycle, and one cycle is the sum of the first preset time and the second preset time. The pressure inside the crack is effectively controlled by periodically controlling the concentration of sand in the crack, the complexity of the crack is improved, the contact area of a hydrocarbon reservoir and the crack is increased, and then the yield is increased under the condition of not polluting the stratum.

The invention discloses a honeycomb transport ship. The honeycomb transport ship comprises a cargo hold area, the cargo hold area is internally provided with six cargo holds with the same cross-section shapes, the six cargo holds are circumferentially distributed and adjacent to each other in pairs, and the adjacent cargo holds are divided by main bulkheads; a water ballast tank is arranged between each cargo hold and the outer wall of the cargo hold area; auxiliary bulkheads for dividing inner cavities of the cargo holds into honeycomb shapes are arranged in the cargo holds, the auxiliary bulkheads divide the inner parts of the cargo holds into a plurality of cargo holes, the cargo holes extend longitudinally along the ship, and the cross sections of all the cargo holes are shaped like regular hexagons with the same size; the adjacent cargo holes are divided by the auxiliary bulkheads; the inner end parts of the six cargo holds form a pipe tunnel area in a sounding mode; and the crosssection of the cargo hold area is composed of the six cargo holds, the six water ballast tanks and the pipe lane area. According to the honeycomb transport ship, the structure is exquisite, and materials are saved; and the bulkhead plate structure has good self-bending resistance, large section modulus, and high longitudinal strength.

The invention discloses a hollow square-shaped adhesive pressing fixture. The fixture comprises a base, the base is provided with a support column, one end of the support column is fixedly connected with a support assembly, the support assembly is provided with an air cylinder and sliding support assemblies which are symmetrically distributed, a start switch controls the expansion and retraction of a movable member of the air cylinder, and the movable member of the air cylinder penetrates through a first through hole to be fixedly connected with a first connecting block; the lower portion of the first connecting block is fixedly connected with a pressing assembly, the pressing assembly comprises a pressing support plate, a pressing connecting plate is arranged under the pressing support plate, and a pressing plate is arranged under the pressing connecting plate. Through the contact extrusion between the pressing plate and hollow square-shaped adhesive tape, the stability and pressing precision of the bonding and pressing operation of the square-shaped adhesive tape are ensured, the subjective dependence on a worker is reduced, effective control over the pressing force is realized,and the demand for mass production can be met; the labor intensity of the worker is reduced, the work efficiency is improved, the product assembly yield is increased, and the economic loss of customerends and assembly plants is reduced.

The invention discloses a supercritical water oxidation industrial salt elimination method, which adopts double lock hoppers or multiple lock hoppers to charge and release pressure so as to realize a safe, stable and long-period continuous salt elimination method, and at present, a salt solution back pressure valve method is adopted to eliminate salt, and the salt elimination is discontinuous salt elimination. Compared with the prior art, the problems of pressure fluctuation, repeated pressurization and pressure relief and the like of the reactor possibly caused by back pressure valve salt discharge are solved; meanwhile, the problems that due to the fact that the salt solution back pressure valve is seriously abraded and blocked due to pressure relief and frequent replacement of the back pressure valve, model selection and stable operation of the back pressure valve are difficult all the time, stable operation of the device is directly affected, and particularly frequent replacement is difficult to achieve when radioactive materials are treated are solved.