637 results about "Pressure reduction" patented technology

The invention relates to the technical field of desulfurization towers, in particular to an ultrasonic agglomeration dedusting and demisting device of a desulfurization system and an operation method thereof, and aims to solve the problems that in the prior art, fine particles in flue gas are not subjected to agglomeration pretreatment, a targeted cleaning mechanism is lacked, and a demister is easily blocked due to filter residue attachment after long-term operation; and finally, the dedusting and demisting efficiency of the desulfurizing tower is reduced. According to the invention, the ultrasonic generation module is started, parameters are dynamically optimized based on a PLC and a fuzzy PID algorithm to induce agglomeration of PM2.5 and fog drops, the particle size is increased through a depressurization ring, and then efficient gas-liquid separation is carried out through a dual separation mechanism; when filter residues are attached, the motor drives the spray pipe to rotate and spray, the cleaning assembly is matched for wiping, the guide assembly guides waste liquid, the intelligent system adjusts in real time and triggers a cleaning program, a pretreatment and cleaning mechanism is established, blockage is eradicated, stable operation of parts is ensured, and the dust and mist removal efficiency is improved.

The present application relates to the technical fields of traditional Chinese medicine extraction, and discloses a steam condenser for traditional Chinese medicine extraction, which comprises a spiral water cooling structure, a rotary linear motion structure and an elastic resistance type pressure reduction structure, a discharge port fixedly installed at a liquid discharge port and internally provided with a spiral spring with a basic same elastic strength as a low pressure strength in the working state of a concentration tank and a valve plate extruded by the spiral spring and in a closed state. The steam condenser for traditional Chinese medicine extraction can be connected with a low pressure type concentration tank, has a small influence range on the low pressure state in the concentration tank, can guarantee the normal evaporation and concentration function of the traditional Chinese medicine liquid in the concentration tank, can condense high temperature steam and can produce a suction type driving effect on the high temperature steam in the concentration tank, so that the high temperature steam can be condensed in time, the condensed liquid can flow back to the concentration tank to be evaporated and concentrated again, and the effective utilization rate of the liquid medicine is improved.

The invention relates to the technical field of underground water monitoring, and discloses a shallow underground water burial depth monitoring and sampling device. The monitoring and sampling device comprises a drilling unit, a monitoring unit, a sampling unit and a control unit. A hollow cavity is formed in the drilling unit, the sampling unit comprises a pressure reduction system, a check valve and a sampling guide pipe with a control valve, and the pressure reduction system comprises a power device, a closed piston driven by the power device and a reset element. The control unit is electrically connected with the sensor and the pressure reduction system. According to the invention, drilling, monitoring, sampling and control are integrated, the full-flow automatic closed-loop operation of water level monitoring and water sample collection is realized, the problems of separation, complexity, easy pollution and water body disturbance in the traditional method are solved, and the field monitoring and sampling efficiency and data reliability are improved.

The invention aims to provide a coal mine water inrush body deep ex-situ dredging and restoring method and system, and belongs to the technical field of coal mine water disaster prevention and control. The system comprises a water inrush body recognition module, a drainage depressurization system, a closed pipeline collection system, a storage stratum screening and well design module, a high-pressure storage ectopic dredging system and a safety monitoring system. According to the method, the water inrush body is identified by finely evaluating the hydrogeological conditions, the optimal hydrogeological parameters are obtained by using the parameter inversion model and the particle swarm optimization, and drainage and pressure reduction are guided; a reservoir capacity grade dynamic evaluation system is established, a deep suitable stratum is screened, collected mine water is stored back to the deep part by using high-pressure equipment, and full-period safety monitoring is performed in combination with a multi-source data fusion early warning model. The strategic reserve of the mine water depth is achieved, the underground water ecology is effectively maintained, and the treatment cost and the safety risk are remarkably reduced.

The application relates to a slurry valve with high sealing durability, belonging to the slurry valve field, which comprises an upper valve body, a lower valve body, a valve flap, a sealing ring, an upper ring plate and a lower ring plate, the relative positions of a first pressure reduction ring part and a second pressure reduction ring part are protrusively provided with first protruding teeth; the opposite positions of the upper ring plate and the lower ring plate are protrusively provided with second protruding teeth, the gap between the tooth groove bottom of the first protruding teeth and the tooth top of the second protruding teeth and the gap between the tooth top of the first protruding teeth and the tooth groove bottom of the second protruding teeth are set as second pressure reduction holes, the inner diameters of the upper ring plate and the lower ring plate are connected through a sealing elastic piece, the sealing elastic piece is used for forcing the vertical separation movement of the upper ring plate and the lower ring plate; the space surrounded by the groove wall of the expansion groove and the inner wall of the sealing elastic piece is set as a first pressure reduction space, and the space surrounded by the sealing elastic piece, the sealing ring, the first connecting ring part and the second pressure reduction ring part is set as a second pressure reduction space. The application can reduce the erosion and wear of the sealing surface, so as to improve the sealing durability.

The utility model discloses an air bag polishing pressure intelligent feedback device which comprises a handle, a polishing mechanism used for polishing is arranged on one side of the handle, and a power mechanism used for providing power for the polishing mechanism is arranged in a polishing machine body. A transmission mechanism used for transmitting power generated by the power mechanism to the polishing mechanism is arranged in the polishing machine body, and an air supplementing and reducing mechanism used for inflating the polishing mechanism and detecting air pressure is arranged in the polishing machine body. The polishing mechanism is used for polishing the workpiece with the concave surface. And the power mechanism is arranged for providing power when the workpiece is polished. And the transmission mechanism is arranged for transmitting power to the polishing mechanism. The air supplementing and reducing mechanism is arranged and used for detecting the pressure in the air bag when the workpiece with the concave surface is polished, and pressure supplementing and pressure reducing are conducted on the air bag according to the detected pressure.

The invention discloses a three-telescopic stand column of a hydraulic support, and relates to the technical field of hydraulic supports. The three-telescopic stand column of the hydraulic support comprises a first cylinder body, a second cylinder body, a third cylinder body, a movable column and a liquid supply assembly, the piston end of the second cylinder body is assembled in an inner cavity of the first cylinder body in a sliding mode, a first cavity and a second cavity are divided on the two axial sides of the second cylinder body, and the piston end of the third cylinder body is assembled in an inner cavity of the second cylinder body in a sliding mode; the piston end of the movable column is slidably assembled in an inner cavity of the third cylinder body, the liquid supply assembly comprises a first pipe, a second pipe and a one-way overflow valve, the first pipe is communicated with the first cavity, the second pipe is communicated with the second cavity, the input end of the one-way overflow valve is connected with the first pipe, and the output end of the one-way overflow valve is connected with the second pipe. The one-way overflow valve is used for being communicated with the second pipe when the pressure in the first pipe is larger than the first set pressure. The three-telescopic stand column of the hydraulic support has the pressure reducing and buffering effects and is good in impact resistance.

The application provides a one-way sealing ring, a sealing mechanism, a tail pipe top packer and a tail pipe cementing process, wherein the one-way sealing mechanism comprises a center pipe, an upper deformed sleeve arranged on the outer wall of the center pipe, a lower deformed sleeve arranged on the outer wall of the center pipe, the upper deformed sleeve and the lower deformed sleeve being spaced apart in the axial direction, a sealing element arranged on the outer wall of the center pipe, the lower end of the sealing element being in abutment with the upper end of the lower deformed sleeve, an expansion cone arranged between the upper deformed sleeve and the sealing element, a sealing groove being arranged on the inner wall of the expansion cone in the circumferential direction, a sealing ring being arranged in the sealing groove, a flow-off groove being arranged on the inner wall of the expansion cone in the axial direction, the flow-off groove penetrating through the upper end and the lower end of the expansion cone, and fluid being allowed to flow only in one direction from the upper end of the expansion cone to the lower end of the expansion cone along the flow-off groove, while the fluid under the packer is allowed to flow upward, the wellhead annulus is allowed to be pressurized for cement setting, the pressure reduction caused by volume shrinkage is prevented to prevent the stratum fluid from flowing out, and the cementing quality is ensured.

The utility model discloses a protective pressure gauge, which relates to the technical field of pressure gauges, and comprises a protective shell and a pressure gauge main body, the inner side of the protective shell is provided with a protective assembly, the inner side of the protective shell is fixedly connected with a protective air bag, and an exhaust hole is arranged between the protective shell and the protective air bag. The top of the protective shell is fixedly connected with an alarm device, the side face of the pressure reduction cylinder is provided with an anti-corrosion shell, and the coil rotor is electrically connected with the alarm device. Through the arranged pressure relief assembly, quick pressure relief can be conducted at the position of the pressure gauge, the pressure gauge is effectively prevented from being damaged due to overpressure, and the protective air bag is inflated in the pressure relief process; the protection air bag is tightly attached to the pressure gauge, if explosion occurs, the protection shell and the protection air bag can play a buffering role, meanwhile, gas drives the coil rotor to rotate to cut magnetic induction lines to generate induction current, the alarm device is triggered to give an alarm, various safety protections are adopted, and the safety and reliability of the pressure gauge are greatly improved.

The application relates to the technical field of ball valves, in particular to a large-pressure-difference-operated half-ball valve, which comprises a valve body, flanges are fixedly connected to two ends of the valve body, an upper pressure cover is fixedly connected in communication with the top of the valve body, an upper actuator is fixedly connected to the top of the upper pressure cover, and a lower shaft sleeve is fixedly connected in communication with the bottom of the valve body; through the design of staged pressure reduction and step-by-step opening and closing, the actuator load is significantly reduced, the service life of the valve is prolonged, and the manufacturing cost is reduced; specifically, channel two is first opened to balance the pressure of the upstream and downstream, then channel one is opened, the staged pressure reduction is realized, the medium force required to be overcome by the actuator is greatly reduced, meanwhile, double actuators are adopted to replace a single actuator, two small-torque actuators are used to control two valve cores, the total cost is much lower than that of a single large-torque actuator, and two valve seat rings are independently arranged, bidirectional sealing is realized by matching corresponding half spheres and O-shaped small ball valve cores, and the sealing reliability is effectively improved.

The utility model relates to the technical field of steam quality detection, in particular to a full-automatic steam quality detector, which comprises a flow limiting device, a detector and a controller, the heating device is connected with the flow limiting device and used for heating the throttled steam to superheated steam; the heat exchange device is connected with the heating device and used for condensing the steam; the non-condensable gas measuring device is connected with the heat exchange device and is used for collecting non-condensable gas; the flow limiting device, the heating device, the heat exchange device and the non-condensable gas measuring device are all connected with the controller. According to the steam quality detection device, the steam quality detection structure is simplified.

The utility model discloses a coking anti-blocking mechanism for a second-line distillation outlet of reduced pressure distillation, and particularly relates to the technical field of distillation kettles, the coking anti-blocking mechanism comprises a distillation kettle, a first distillation port and a second distillation port are respectively arranged on the distillation kettle, and a mounting groove is arranged in the second distillation port. A plurality of heating pieces which are arranged in a linear array are arranged in the mounting groove, an outlet pipe is arranged on the second distillation opening, and a plurality of guide grooves which are arranged in a linear array are formed in the outlet pipe. According to the distillation kettle provided by the utility model, exhaust and liquid discharge are realized through the first distillation port and the second distillation port on the distillation kettle, installation of a plurality of heating elements is realized through the installation groove of the second distillation port, liquid discharge is realized through the outlet pipe on the second distillation port, and liquid is guided through a plurality of guide grooves on the outlet pipe; the liquid flow rate is increased.

The invention relates to the technical field of fire-fighting equipment, in particular to a diaphragm fire-fighting water pump with an automatic pressure stabilizing function and application thereof.The diaphragm fire-fighting water pump comprises a water pump body, a pressure stabilizing pump is fixed to the front side of the water pump body, a pressure stabilizing tank is fixed to the right side of the pressure stabilizing pump, and a film is fixed to the middle of the pressure stabilizing tank; a pressure supplementing assembly is arranged in the upper half part of the surge tank and comprises a pressure supplementing plate, an abutting rod and a cylinder sleeve, the upper end of the abutting rod is slidably connected with the cylinder sleeve, and a pressure spring used for pressing the abutting rod downwards is arranged in the cylinder sleeve; a gear is rotationally connected to the outer wall of the sleeve, a toothed plate is fixed to the outer wall of the abutting rod, a transverse plate is fixed to the right side wall of the gear, and a metal sheet is arranged above the transverse plate. By arranging the pressure supplementing assembly, in winter, the abutting rod downwards presses the pressure supplementing plate to downwards press the thin film, the pressure lost due to temperature reduction above the thin film is supplemented, pipe network water pressure reduction caused by air pressure reduction in winter is prevented, and burnout of the stabilized pressure pump is avoided; and meanwhile, by arranging an adjusting structure, the pressure can be adjusted and supplemented according to actual conditions during use, so that the practicability is improved.

A wearable system for applying a vacuum to breast of a user comprises first and second elastically deformable membranes for positioning over each other and over the breast, with the first (inner) membrane defining a milk collection volume over the breast. The first membrane is manually deformable by actuating the second (outer) membrane, and a valve releases air from the milk collection volume. A pressure reduction is thereby generated when the first membrane tries returns to its default shape. A space between the first and second membranes is vented to the surrounding atmosphere to allow the second membrane to return to its default shape without generating a reduction in pressure. The second membrane functions as a protecting outer layer for the first membrane.

The present application relates to the field of gas-liquid mixing, and provides a bubble generator and an ozone aerator, wherein the bubble generator comprises an inlet connecting end, an outlet connecting end and a throttler assembly, the inlet of the throttler assembly is detachably connected with the inlet connecting end, the outlet of the throttler assembly is detachably connected with the outlet connecting end, the throttler assembly comprises at least two groups of throttling holes and mixing chambers, and the throttling holes and the mixing chambers are alternately arranged in the direction from the inlet connecting end to the outlet connecting end; the inner diameter of the throttling hole continuously decreases. The present application solves the low aeration efficiency in the prior art, the gas-liquid mixed flow enters the throttler assembly with multiple groups of throttling holes and mixing chambers through the inlet connecting end, the inner diameter of the multiple groups of throttling holes decreases in sequence to carry out multiple times of pressurization, gas dissolution and pressure reduction, and smaller bubbles such as nanoscale bubbles are obtained, the diameter of the generated bubbles is adjusted by arranging different groups of throttling holes and mixing chambers, and the adding efficiency of ozone and other gases is improved, and energy consumption is reduced.

The utility model relates to the technical field of air conditioning, and discloses an air conditioner outdoor unit which comprises a compressor, a condenser, a throttling device, a cooling pipeline and a self-adaptive injection valve. The air inlet end of the condenser communicates with an exhaust port of the compressor; the liquid inlet end of the throttling device is communicated with the liquid outlet end of the condenser; one end of the cooling pipeline is communicated with the liquid outlet end of the condenser, the other end of the cooling pipeline is communicated with an air suction port of the compressor, and a first part of the cooling pipeline extends to the computer board to exchange heat with the computer board; and the self-adaptive injection valve is arranged on the cooling pipeline, the self-adaptive injection valve is opened under the condition that the pressure difference between the two ends exceeds a preset value so that part of the refrigerant can return to an air suction port of the compressor after throttling and pressure reduction, and the opening degree of the self-adaptive injection valve is in positive correlation with the pressure difference. The utility model further discloses the air conditioner.

An aircraft hydraulic system 100 comprises common hydraulic pressure sources 11 and 12 and pressure reduction valves 21 and 22. The common hydraulic pressure sources 11 and 12 supply a shared hydraulic pressure to a low pressure operation unit 103 that is disposed in an aircraft 101 and that operates by a relatively low operating hydraulic pressure and to a high pressure operation unit 102 that is disposed separately from the low pressure operation unit 103 in the aircraft 101 and that operates by a relatively high operating hydraulic pressure. The pressure reduction valves 21 and 22 reduce the hydraulic pressure that is supplied to the low pressure operation unit 103.

The invention discloses a simulation device for a small low-temperature reactor control rod position closed-loop control system, particularly relates to the technical field of low-temperature reactor control, and is characterized in that a combination valve simulation load is used for generating a high-voltage signal based on a received high-voltage direct-current signal of a control rod driving mechanism and performing voltage reduction processing on the high-voltage signal to obtain a high-voltage signal; a low-voltage signal is obtained; the analog quantity voltage acquisition module is used for receiving the low-voltage signal and analyzing and processing the low-voltage signal to obtain a control rod simulation action; the PXI controller is used for receiving a control rod simulation action to generate a rod position simulation value and calculating a binary code value of the rod position simulation value; the switching value signal output module is used for outputting a switching value signal based on the binary code value of the received rod position simulation value so as to control the rod position simulation module; and the rod position simulation module is used for generating and outputting a rod position simulation signal under the control of the switching value signal output module based on the received rod position excitation signal of the rod position measurement device.

The utility model belongs to the technical field of natural gas, and particularly relates to a safety valve which comprises a main valve, a first connector is arranged on one side of the main valve in a communicated mode, a second connector is arranged on the side, away from the first connector, of the main valve in a communicated mode, and a manual valve is arranged on the side, away from the main valve, of the second connector in a communicated mode. A butterfly knob is arranged on the upper side of the manual valve, a threaded connector is arranged on the side, away from the main valve, of the manual valve in a communicating mode, and fixing frames are symmetrically arranged on the two sides of the manual valve. When fuel gas is overpressure or underpressure, the main valve can be automatically closed, after the main valve is closed, the air pressure in the second connector is rapidly reduced, the pressure sensor detects that the pressure is reduced, the controller controls the motor in the fixing shell to be started, the output end of the motor drives the clamping sleeve to rotate, and the clamping sleeve screws the butterfly knob to control the manual valve to be closed. The manual valve is closed automatically, double circuit break is completed, manual closing control is not needed, and the potential safety hazard of fuel gas is further reduced.

The invention discloses an engine pedestal oil supply pressure regulating system which comprises an engine assembly, a plurality of oil depots, an oil tank and a regulating assembly, the engine assembly is used for measuring oil consumption, the oil depots are arranged side by side and used for storing different types of oil products, and the oil tank is arranged above the engine assembly and used for temporarily storing the oil products. The oil tank can communicate with the multiple oil depots and the engine assembly, and the regulation and control assembly is arranged between the oil tank and the engine assembly and between the oil depots and used for controlling the oil tank to communicate with the engine assembly and the oil depots. According to the invention, the problems that gas exists in fuel oil and the pressure is violently fluctuated after pressure reduction due to relatively large pressure fluctuation when a pressure reducing and regulating valve group is used for supplying oil and regulating pressure for an engine pedestal can be effectively solved.

The invention discloses a method for releasing liquid carbon dioxide in the technical field of high-pressure pipeline safety release, which is used for a refrigerating system and comprises the following steps of: reducing the flow rate of carbon dioxide entering a well and releasing the carbon dioxide in the well based on the liquid level of a gas-liquid separation tank and the inlet pressure of a throttling and pressure reducing device; the compression power is reduced along with the reduction of the pressure of the air return port of the combined cooling and heating device; after the device is shut down, the carbon dioxide release rate of the lifting well is reduced, and gas return is stopped; when the pressure of the carbon dioxide outlet of the heat exchanger is reduced to a threshold value, discharging is stopped; when the system pressure is balanced, the carbon dioxide in the well is released. The flow of carbon dioxide entering the well is reduced based on the liquid level of the gas-liquid separation tank and the pressure of the throttling and pressure reducing device, well rising carbon dioxide is released, the compression power of the combined cooling and heating device is coupled with the pressure of an air return port, then releasing is stopped, global releasing is conducted after the system pressure is balanced, and the risks of dry freezing, freezing and valve freezing are eliminated; and the discharge safety and the system stability are improved.

Disclosed are a pouch case transfer apparatus and a pouch case transfer method using the same, and more particularly, disclosed is a pouch case transfer apparatus including: a close contact unit configured to be in close contact with one surface of a pouch case, the close contact unit having a specific area; a support bar connected with the close contact unit, the support bar configured to move the close contact unit; the close contact unit includes a main plate configured to face an edge portion of the pouch case, and the main plate is provided, at one surface thereof, with a first suction channel or a suction member exposed toward the edge portion of the pouch case, and a second suction channel or a suction member exposed toward the edge portion of the pouch case; the first adsorption channel or the adsorption member is configured to adsorb an edge portion of the pouch case by pressure reduction.

The invention discloses a method for designing a porous throttling sleeve of a steam regulating valve with a multi-stage pressure drop structure. The method comprises the steps that the type, working condition parameters and geometric parameters of a valve needing to be designed are obtained; the blocking pressure difference of the regulating valve is calculated, and the minimum pressure reduction stage number where choking flow does not occur is calculated according to the pressure distribution of the indexes; the throttling area needed by each stage when the pressure drop requirement is met is determined through a computational fluid mechanics method; the noise level of the regulating valve under different apertures is determined by adopting a computational fluid mechanics method, and the aperture corresponding to the minimum noise is found through a curve equation fitting method. The method is applied to the design process of the porous throttling sleeve of the steam regulating valve, the optimal stage number is determined by calculating the minimum pressure reduction stage number, the flow area of each stage and the pore diameter with the lowest noise level, the structural design of the porous sleeve of the steam regulating valve is achieved, and the method is particularly suitable for industrial scenes with high steam parameter control precision and strict noise requirements; and the method has remarkable technical value and market application prospect.

The utility model discloses an adjustable pressure reducing valve structure of an airplane wheel jack, which relates to the field of pressure reducing valves and comprises a hydraulic manifold block, a one-way valve is arranged at the bottom of the hydraulic manifold block and comprises a one-way hole arranged at the bottom of the hydraulic manifold block, and a one-way valve steel ball and a one-way valve seat are sequentially arranged in the one-way hole from top to bottom. An overflow valve is arranged on one side of the hydraulic integrated block and comprises an overflow hole formed in one side of the hydraulic integrated block, and an overflow valve steel ball, an overflow valve seat, an overflow valve spring and an overflow valve element are sequentially arranged in the overflow hole from inside to outside. Compared with an existing pressure reducing valve, the pressure reducing valve has the advantages that the space of the pressure reducing valve is effectively saved, good pressure reducing performance is guaranteed, the pressure difference between the pressure of a low-pressure hand pump and the pressure of a high-pressure hand pump is reliable, pressure reduction is achieved, and the pressure reducing valve is compact in structure, light in weight and small in size.

The utility model discloses a regulating valve with pressure reduction and noise reduction functions, which comprises a valve body, the top of the valve body is integrally connected with a valve pipe, the top of the valve pipe is in threaded connection with a valve rod, and the outer side of the valve body is respectively provided with a first sound insulation cover and a second sound insulation cover. Sound insulation pads are installed on the inner side of the first sound insulation cover and the inner side of the second sound insulation cover correspondingly, first locking plates are fixedly connected to the top and the bottom of the first sound insulation cover correspondingly, locking openings are formed in the front faces of the first locking plates, second locking plates are fixedly connected to the top and the bottom of the second sound insulation cover correspondingly, and lock catches are fixedly connected to the front faces of the second locking plates. A valve seat is fixedly connected into the valve body, a noise reduction sleeve is installed at the top of the valve seat, a noise reduction opening is formed in the outer side of the noise reduction sleeve, and the pressure reduction and noise reduction effects of the regulating valve are improved through the noise reduction sleeve, the first sound insulation cover, the second sound insulation cover and a sound insulation pad.

This invention discloses a constant flow pressure reducing valve, relating to the field of hydraulic valve technology. It includes a valve seat with an oil outlet, an oil inlet, and a drain port arranged sequentially from right to left. An elastic pressure regulating component is located at the left end of the valve seat, and a spool valve core is abutted at the right end of the elastic pressure regulating component. An axially movable elastic flow control valve core is located at the right end of the spool valve core. A drain channel communicating with the inner cavity of the valve seat is opened at the left end of the spool valve core, and the drain channel is connected to the drain port. The valve core slides within the valve seat, allowing oil to flow out from the drain port to relieve pressure. An oil inlet channel communicating with the oil inlet is located at the right end of the spool valve core, and a throttling channel communicating with both the oil inlet and outlet is provided on the elastic flow control valve core. The movement of the elastic flow control valve core within the valve seat maintains a constant pressure difference between the throttling channel and the oil inlet channel, thereby achieving a constant output flow rate. This constant flow pressure reducing valve achieves pressure reduction in the oil circuit and a constant output flow rate, facilitating processing and disassembly, and simplifying the hydraulic circuit.

The butylene determination pretreatment device provided by the invention comprises: a sample introduction system, wherein the sample introduction system comprises a steel cylinder for containing a sample and a pretreatment sample introduction device communicated with the steel cylinder; the pretreatment sampling device is located at the front end of the waste gas treatment system, and the waste gas treatment system is connected with the pretreatment sampling device through a switching valve and a pipeline; the detection system comprises a gas chromatograph and a gas source which are connected, and the pretreatment sampling device is connected with the detection system; the pretreatment sampling device comprises a purification module, a heating module and a pressure reduction module which are connected, the purification module is connected with the steel cylinder, the heating module is arranged on the right side of the purification module, the pressure reduction module is arranged on the right side of the heating module, and the pressure reduction module is connected with the waste gas treatment system and the gas chromatograph; the waste gas treatment system comprises an adsorption device, a gas collection part and a flow control part; non-uniform sample gasification is avoided through the pretreatment sampling device, the obtained gas analysis result is good in repeatability, and a waste gas treatment device is added to complete sample purification.

The invention discloses a hydraulic pressure maintaining system for an electric pile of a high-pressure water electrolyser and a control method, and belongs to the technical field of new energy and high-efficiency energy conservation. The system comprises a water electrolyser galvanic pile, a hydraulic system, a sensing unit and a control unit. The hydraulic system is used for applying adjustable clamping force to the electric pile of the water electrolyser; the sensing unit acquires a contact resistance signal and a back pressure signal of the electric pile in real time; the control unit receives the signals, adjusts the output pressure of the hydraulic system, and maintains the effective contact pressure of the galvanic pile. The hydraulic system comprises a structural assembly and a hydraulic driving assembly, wherein the hydraulic driving assembly comprises a hydraulic cylinder, a hydraulic pump, an oil tank, an electromagnetic valve and the like. The control method comprises the three steps of collecting parameters in real time, calculating a target pressure value and controlling the hydraulic system to apply corresponding clamping force, and pressure adjustment is divided into a pressure increasing stage, a pressure maintaining stage and a pressure reducing stage. The clamping force can be automatically adjusted according to the running state of the galvanic pile, and the problem that the sealing performance and contact resistance of the galvanic pile change in the high-pressure water electrolysis process is effectively solved.

To provide a die casting apparatus capable of reducing the entry of molten metal at a low temperature at the tip of the molten metal into a cavity even when the molten metal runs ahead.SOLUTION: A die casting apparatus 1 includes a molding die 3 having a product cavity 21, a runner 23 and a plurality of gates 25, an injection part 5 for injecting molten metal into the product cavity 21, a decompression part 7 for decompressing the inside of the product cavity 21, and a gate opening / closing part 9 for opening / closing the plurality of gates 25. The mold 3 has a molten metal pool part 27 connected to the 23b of the leading end part of the runner 23. The gate opening / closing part 9 opens at least one gate 25 positioned at the 23b side of the tip part when the pressure reduction by the pressure reducing part 7 is started, and opens all of the plurality of gates 25 when a prescribed time passes after the injection of the molten metal into the product cavity 21 in the reduced pressure state by the injection part 5 is started.SELECTED DRAWING: Figure 2

The present invention relates to a method for operating a hydraulic system (10) of a motor vehicle transmission, wherein the hydraulic system (10) comprises: a hydraulic pump (12), a first hydraulic valve (26), a second hydraulic valve (28), and an oil pan (32). In a first method step, a diagnosis is performed on the first hydraulic valve (26), wherein if a defect in the first method step is identified, a second method step is performed to achieve a pressure reduction in the working pressure line (36), wherein in the second method step, the second hydraulic valve (28) is briefly moved to a second actuated position, in which a connection is established between the second working pressure port (44) of the second hydraulic valve (28) and the second actuated port (46) of the second hydraulic valve (28) by means of the second hydraulic valve (28), wherein subsequently, in a third method step, the second hydraulic valve (28) is moved to a second stationary position, in which a connection exists between the second actuated port (46) and the oil pan (32).