30results about How to "Address pressure fluctuations" patented technology

A movable laboratory with high biological safety is composed of primary experiment cabin, person cleaning and technological supporting cabin including clothes exchanging room, buffering room and substance transfer window between them, air-tight flexible connection channel between said both cabins, and the connected water and air pipelines, cables and signal lines.

The invention discloses a device and a method for testing a gas diffusion coefficient in a porous medium. The device mainly comprises a clamp holder, gas sampling systems, a confining pressure pump, a pressure balancing system, a gas supply system, a gas chromatograph analyzer and a vacuum pump; the two ends of the clamp holder are connected to the inlet ends of the gas sampling systems; the outlet ends of the gas sampling systems are connected with the gas chromatograph analyzer and the vacuum pump; the two ends of the clamp holder are connected with the gas supply system respectively, and are also connected with the confining pressure pump and the pressure balancing system; the clamp holder comprises a housing, a sample bridge, a sample cavity and a plug; a confining pressure cavity is arranged in the housing; the sample bridge is positioned in the center of the clamp holder; a porous medium sample is stored in the sample cavity. Through the adoption of the method, influence on a test result, which is caused by the seepage flow of gases in the porous medium in a testing process and pressure fluctuation during gas sampling, is eliminated, and interference of residual gases in a sampling pipeline to the test result is effectively reduced. The device and the method are reliable in principle and simple and convenient to operate, improves the accuracy of the diffusion coefficient to be tested, and has a broad market prospect.

A rotary pressure filter apparatus, a sealing device for use with the rotary pressure filter apparatus, and a process of using the apparatus. The rotary pressure filter apparatus is designed to treat a solid-liquid mixture under pressure in successive work zones. A rotary drum moves compartments containing the solid-liquid mixture through the successive zones. The zones are separated by a sealing member. The sealing member is designed to reduce pressure fluctuations as the compartments enter a successive zone.

The invention discloses mixing equipment for high pressure natural gas and low pressure coal gas. The equipment includes: a low pressure coal gas conveying pipeline, a high pressure natural gas pipeline and a pressure reducing assembly. The low pressure coal gas conveying pipeline is connected to a pressurization machine and conveys low pressure coal gas. The pressurization machine pressurizes the low pressure coal gas and then conveys the coal gas to a heating furnace. The high pressure natural gas pipeline conveys high pressure natural gas. One end of the pressure reducing assembly is connected to the high pressure natural gas pipeline, and the other end is connected to the output end of the pressurization machine. The pressure reducing assembly reduces the pressure of the high pressure natural gas, then the pressurized low pressure coal gas is mixed, and the mixture is conveyed into the heating furnace. The pressure reducing assembly consists of an inlet trip valve, a multi-stage pressure regulator, a safe blow-off valve, a pressure regulating blow-off valve, a flow regulating valve and an outlet trip valve. The invention also discloses a mixing method for the high pressure natural gas and the low pressure coal gas. According to the invention, high pressure natural gas can be decompressed by a decompression way and then mixed into the low pressure coal gas, thus solving the pressure fluctuation problem during mixing of the high pressure natural gas into low pressure coal gas.

The embodiment of the invention provides an excavator proportional valve hysteresis compensation method and device, an excavator and a processor, the excavator comprises a main pump, a controller and a proportional valve. The method comprises the steps of obtaining the target action of the main pump; generating a corresponding PWM signal according to the target action of the main pump; superposing a tremor signal on the PWM signal; and outputting the PWM signal superposed with the tremor signal to a proportional valve so as to reduce hysteresis of the proportional valve. By optimizing the program of the controller, the hysteresis condition of the proportional valve is compensated and improved under the condition that the electro-hydraulic control system is not changed and the original PWM (Pulse Width Modulation) output frequency is not changed at the same time. Meanwhile, the PWM output signal is always subjected to change response, so that the control precision of the proportional valve is greatly improved, errors generated when the controller adjusts the proportional valve to do reciprocating movement are reduced, and the precision and stability of the hydraulic system are remarkably improved.

The invention relates to an injection type refrigeration cycle system and a utilization method thereof. The injection type refrigeration cycle system comprises a generator, an injector, a condenser, a throttle valve, an evaporator, a circulating pump, a liquid storage container, a first valve and a second valve, wherein the generator, the injector, the condenser, the circulating pump, the liquid storage container and the first valve are sequentially connected end to end to form a first circulation loop; the injector, the condenser, the throttle valve and the evaporator are sequentially connected end to end to form a second circulation loop; the generator, the second valve, the liquid storage container and the first valve are sequentially connected end to end to form a third circulation loop; and the position of the liquid storage container in the vertical direction is higher than the position of the generator in the vertical direction. According to the injection type refrigeration cycle system, the outlet pressure of the circulating pump is far lower than the outlet pressure of a circulating pump in a traditional injection type refrigeration cycle system, the efficiency of the circulating pump is higher, the size of the integral refrigeration cycle system is effectively decreased, and the practicability is higher.

The invention discloses a continuous cooking anti-reverse spraying device. The device mainly comprises a frequency-variable transmission system, a feeding spiral shaft, a throat pipe, a push-stopping valve, a pressure-stabilizing tank and an air source stabilizer. The device is mainly characterized in that: the rotation speed of the feeding spiral shaft can be automatically adjusted according to the flow change of materials, so a pushing force is kept stable. The working pressure of an air source is not affected by external environment and is kept constant through the air source stabilizer, so that 'material plug' is not damaged by the fluctuation of flow pressure in a feeding process, and the aim of preventing reverse spraying in a continuous cooking and feeding process is fulfilled.

The invention discloses a stable high-pressure medical pump. The stable high-pressure medical pump comprises a pump body, a liquid inlet pipe and a liquid outlet pipe; a first piston cylinder and a second piston cylinder are arranged in the pump body; a first liquid inlet channel and a first liquid discharge channel communicates with an inner cavity of the first piston cylinder; a second liquid inlet channel and a second liquid discharge channel communicates with an inner cavity of the second piston cylinder; the liquid inlet pipe is respectively connected with the first liquid inlet channel and the second liquid inlet channel, and is provided with one-way valves on the first liquid inlet channel and the second liquid inlet channel; a switching valve is arranged on the pump body; the liquid outlet pipe can communicate with the first liquid discharge channel or the second liquid discharge channel through the switching valve; and pistons and piston rods are respectively mounted in the first piston cylinder and the second piston cylinder. The stable high-pressure medical pump comprises two piston cylinders, uses an asynchronous continuous pressing mode of double pistons to realize reciprocating motions of the double pistons, matches with the one-way valves and the switching valve to realize no-gap continuous high pressure, overcomes the fluctuation problem of a water jet scalpel, and keeps excellent cutting performance of the water jet scalpel under constant pressure.

The invention discloses a vacuum pressure swing adsorption system running under a stable pressure and a control process thereof. The system comprises three sets of adsorption towers, fans and vacuum pumps, each set of adsorption towers consists of two adsorption towers, and each adsorption tower circulates according to the running mode of adsorption, primary even pressure drop, secondary even pressure drop, vacuum desorption, secondary even pressure rise, primary even pressure rise and feeding. The system adopts a six-tower process, through optimal control of the process itself, two pressure equalizing is adopted in adsorption and vacuum desorption processes, and compared with the existing two-tower to five-tower process, the fluctuation range is reduced due to one more pressure equalizing, thus solving the pressure fluctuation problem of the system itself, the problems of fan outlet pressure fluctuation and vacuum pump pressure fluctuation can be solved, and the system can operate stably.

The invention discloses a device and a method for testing a gas diffusion coefficient in a porous medium. The device mainly comprises a clamp holder, gas sampling systems, a confining pressure pump, a pressure balancing system, a gas supply system, a gas chromatograph analyzer and a vacuum pump; the two ends of the clamp holder are connected to the inlet ends of the gas sampling systems; the outlet ends of the gas sampling systems are connected with the gas chromatograph analyzer and the vacuum pump; the two ends of the clamp holder are connected with the gas supply system respectively, and are also connected with the confining pressure pump and the pressure balancing system; the clamp holder comprises a housing, a sample bridge, a sample cavity and a plug; a confining pressure cavity is arranged in the housing; the sample bridge is positioned in the center of the clamp holder; a porous medium sample is stored in the sample cavity. Through the adoption of the method, influence on a test result, which is caused by the seepage flow of gases in the porous medium in a testing process and pressure fluctuation during gas sampling, is eliminated, and interference of residual gases in a sampling pipeline to the test result is effectively reduced. The device and the method are reliable in principle and simple and convenient to operate, improves the accuracy of the diffusion coefficient to be tested, and has a broad market prospect.

The invention provides a dehydration device and method for preparing fuel ethanol based on continuity. The dehydration device comprises a superheater (41) communicated with ethyl alcohol vapor of a high pressure rectifying tower, a regenerative vapor condenser I (71) arranged to be communicated with a hot air source, and a filter device arranged to be used for dehydrating the ethyl alcohol vapor and provided with at least three branch circuits connected in parallel and connected to the position between the superheater (41) and the regenerative vapor condenser I (71), the ethyl alcohol vapor isinjected to the filter device through the superheater (41), the filter device is subjected to dehydration material regeneration treatment through the regenerative vapor condenser I (71), the ethyl alcohol vapor is subjected to dehydration through the filter device, the situation that a molecular sieve adsorbing device is mainly composed of two adsorbers does not exist, therefore the pressure stability of a distillation column is ensured, and the efficiency of alcohol preparation is improved.

A movable laboratory with high biological safety is composed of primary experiment cabin, person cleaning and technological supporting cabin including clothes exchanging room, buffering room and substance transfer window between them, air-tight flexible connection channel between said both cabins, and the connected water and air pipelines, cables and signal lines.

The invention discloses a mixing device of high-pressure natural gas and low-pressure gas, comprising: a low-pressure gas transmission pipeline, a high-pressure natural gas pipeline and a decompression assembly. The low-pressure gas transmission pipeline is connected to the pressurizer and transmits the low-pressure gas, and the pressurizer pressurizes the low-pressure gas and transmits it to the heating furnace. High-pressure natural gas pipelines transport high-pressure natural gas. One end of the decompression assembly is connected to the high-pressure natural gas pipeline, and the other end is connected to the output end of the compressor. Inlet shut-off valve, multi-stage pressure regulator, safety relief valve, pressure regulating relief valve, flow regulating valve and outlet shut-off valve. The invention also discloses a mixing method of high-pressure natural gas and low-pressure gas. The invention can decompress the high-pressure natural gas and then mix it into the low-pressure coal gas, and solves the problem of pressure fluctuation when the high-pressure natural gas is mixed into the low-pressure coal gas.

The invention provides a control system and method of a hydraulic type CNG filling substation. A control system of the hydraulic type CNG filling substation comprises a hydraulic type long pipe semitrailer and a hydraulic substation pressurizing pry. A gas convergence main pipe on the semitrailer leads up to the back portion of the semitrailer from the front portion of the semitrailer and is connected to a CNG rapid connector and connected with a gas pipeline of the hydraulic substation pressurizing pry. According to the control system and method of the hydraulic type CNG filling substation, through the pipeline system of the filling substation and the CNG semitrailer, automatic control over the full operation process of the hydraulic substation can be achieved, and manual intervention isnot needed; the remaining amount and pressure of CNG in each steel cylinder can be monitored in real time, on the premise of guaranteeing normal operation of the filling substation system, pressure supplementation operation can be automatically conducted on CNG in a steel cylinder without liquid infusion, the pressure fluctuation problem in the gas filling process is solved, especially, the gas filling interruption phenomenon existing in the steel cylinder group switching operation process can be avoided, and the problem that in the prior art, manual operation is needed to balance pressure isavoided; and since automatic continuous operation is conducted, frequent start of a motor is avoided, and the operation energy consumption is lowered.

The invention relates to the technical field of diesel and methanol dual-fuel engine systems, in particular to a multi-nozzle methanol injector assembly structure. The multi-nozzle methanol injector assembly structure structurally comprises a methanol injector body, wherein an air inlet and an air outlet are formed in the methanol injector body, an injector assembly mechanism is arranged on the portion, at the inner side of the air outlet, of the methanol injector body, the injector assembly mechanism sprays external methanol gas into the methanol injector body, and the spraying direction is consistent with the flowing direction of gas in the methanol injector body. According to the multi-nozzle methanol injector assembly structure, the production cost is reduced, and meanwhile, the durability, the reliability and the dimensional stability of a product are guaranteed.

The invention relates to organic waste gas heat accumulating type heating power incinerator inlet waste gas heating device which comprises an incinerator body. A gas inlet is formed in the upper portion of the incinerator body, a gas outlet is formed in the back end of the incinerator body, a burner is arranged at the front end of the incinerator body, and a burning chamber is arranged at the front end of the interior of the incinerator body; an air supplementing device is arranged at the front portion of the burning chamber, a flame retardant layer is arranged on the exterior of the burning chamber, and an air flow uniform distribution chamber is arranged on the exterior of the flame retardant layer; and a mixing chamber is arranged at the back end of the interior of the incinerator body, and a waste water spraying gun is arranged at the front portion of the mixing chamber. According to the organic waste gas heat accumulating type heating power incinerator inlet waste gas heating device, pressure fluctuation in a hearth is small, and low concentration waste water can be treated.

The invention discloses a multi-channel regenerative air preheater which comprises regenerative chambers, a reversing valve, air inlet and outlet modules, flue gas inlet and outlet modules and a reversing valve driving device; the number of the regenerative chambers is an even number, the reversing valve is arranged in the middle, and the regenerative chambers, the air inlet and outlet modules andthe flue gas inlet and outlet modules surround the reversing valve; and the air inlet and outlet modules, the reversing valve and the flue gas inlet and outlet modules form a straight line, and the multiple regenerative chambers are evenly divided on the two sides. Through the multi-channel regenerative air preheater, the problems that in the prior art, a rotary air preheater is large in air leakage amount, and flow is cut off at the moment of switching of a valve switching type air preheater are solved.

The invention provides a transfer synchronizing mechanism of a high-temperature and high-pressure formation fluid analysis meter. The transfer synchronizing mechanism comprises two high-precision motors (1-1 and 1-2), two high-precision right-angle speed reducers (2-1 and 2-2) connected with the two high-precision motors (1-1 and 1-2) respectively, a host A (3) connected with the high-precision right-angle speed reducer (2-1), a host B (4) connected with the high-precision right-angle speed reducer (2-2), a metal high-pressure line (5) used for connecting the host A (3) and the host B (4), a synchronizing controller (7) connected with the high-precision motor (1-1) and the high-precision motor (1-2), and synchronous control cables (6) used for being connected with the two high-precision motors (1-1 and 1-2) and the synchronizing controller (7) respectively. The high-precision servo motors and the high-precision right-angle speed reducers are adopted, so that the feeding quantity of the host A and the supplementary quantity of the host B are controlled to be consistent, and pressure is also stabilized.

The invention discloses a method and a device for denitrification and heat recovery of industrial furnace flue gas. The method comprises that the high-temperature flue gas is converted into low-temperature flue gas after heat exchange and reaction in the flue gas channel formed by the U-shaped regenerator containing the catalyst, and the ambient air is heat-transformed in the air channel formed by the U-shaped regenerator containing the catalyst. High-temperature air, flue gas channel and air channel are switched through the reversing valve; the device mainly includes the heating furnace and its air distribution control system, U-shaped regenerator, reversing valve, air inlet and outlet modules, and flue gas inlet and outlet Module and reversing valve driving device; air inlet and outlet modules, reversing valve and flue gas inlet and outlet modules are located on the diameter of the reversing valve, and U-shaped regenerators are evenly distributed on both sides of the diameter of the reversing valve. The invention integrates denitrification and regenerative heat recovery functions, and can replace waste heat boilers and denitrification towers as a whole; it does not need to introduce reducing agents from the outside, which greatly reduces device investment, land occupation and operating costs.

The invention discloses an arbitrarily adjustable device for maximum opening of a check valve clack. According to the device, a rotating shaft extends out of a valve body of a check valve and is respectively connected with a damping arm and a limiting arm with adjustable load bearing on the rotating shaft; and an adjustable limiting plate is further arranged on the valve body. When the valve is opened, the gravity of a part of the valve clack can be balanced by load, so that displacement fluctuation of the valve clack under the action of gravity is avoided when the pressure of the medium is unstable, the pressure and the flow of the medium in a flow passage are influenced, and the balance effect of the load is more obvious when the valve clack is opened. The structure combination of the adjustable limiting plate and the limiting arm enables the maximum opening degree of the valve clack to be controllable. The structure solves the problem of pressure fluctuation in the outlet of a mainoil pump of a lubricating oil system of a nuclear power station or other types of systems, enables the maximum opening degree of the valve clack of the check valve to be arbitrarily adjustable, and simultaneously achieves the indication of the opening degree of the valve clack of the check valve.

The invention provides a fan gas inlet device which comprises a gas inlet pipeline and a gas inlet cap. The gas inlet cap comprises a cap body and two cap side portions extending from the two sides ofthe cap body correspondingly. The cap body is provided with a front edge lip and a rear edge part. A gas inlet is formed between the front edge lip and the gas inlet pipeline. The rear edge part is connected to the gas inlet pipeline. The cap side portions are connected to the gas inlet pipeline and are provided with gas inlet holes. According to the fan gas inlet device, through the manner of changing the condition of a flow field in the fan gas inlet by arranging the gas inlet cap, the pressure fluctuation condition is pressed within an acceptable range, and therefore the problem of pressure fluctuation is solved.

The invention discloses a slurry shield machine with a slurry circulation system. The slurry shield machine with the slurry circulation system comprises an excavation bin, a cutter, an air cushion bin, a gate, a slurry feeding assembly, a slurry discharging assembly, a pressurizer and a stone breaking device, wherein the gate is arranged between the excavation bin and the air cushion bin; the slurry feeding assembly comprises a first slurry feeding tube and a second slurry feeding tube; a slurry outlet of the first slurry feeding tube communicates with the excavation bin; a slurry outlet of the second slurry feeding tube communicates with the air cushion bin; the slurry discharging assembly comprises a first slurry discharging tube and a second slurry discharging tube; a slurry inlet of the first slurry discharging tube communicates with the excavation bin; a slurry inlet of the second slurry discharging tube communicates with the air cushion bin; the pressurizer comprises a ventilation opening which communicates with the air cushion bin; and the stone breaking device is arranged on an upstream side of the slurry inlet of the second slurry discharging tube. According to the slurry shield machine with the slurry circulation system, a first working mode and a second working mode of the slurry shield machine can be switched over when the slurry shield machine runs, and adaptation and tunneling ability of the slurry shielding machine are improved.

The invention relates to a flow and pressure combined control system and method for multiple cold and reheat supply units. The system comprises a first unit, a second unit, a third unit, a heat supply mother pipe, a heat supply mother pipe pressure setting module, a heat supply mother pipe flow demand calculation module, a multi-unit actual generation power acquisition module, a multi-unit flow scheduling module, an amplitude and speed limiting module, a deviation calculation module and a PID control module. Through combined operation of flow adjustment of the two units and pressure adjustment of one unit, on one hand, heat supply mother pipe flow demand estimation calculation and real-time adjustment are achieved, so that flow adjustment economic performance real-time calculation is conducted according to the current unit electric load condition, heat load dynamic distribution of the two heat supply units is achieved, and the heat supply efficiency is improved. Therefore, the purposes of energy conservation and emission reduction are achieved; on the other hand, the problem of pressure fluctuation caused in the flow adjusting process can be solved through single pressure adjustment, and the steam parameter quality of steam enterprises is guaranteed. Therefore, excellent plant-level joint scheduling is realized.

The invention discloses a stable high-pressure medical pump. The stable high-pressure medical pump comprises a pump body, a liquid inlet pipe and a liquid outlet pipe; a first piston cylinder and a second piston cylinder are arranged in the pump body; a first liquid inlet channel and a first liquid discharge channel communicates with an inner cavity of the first piston cylinder; a second liquid inlet channel and a second liquid discharge channel communicates with an inner cavity of the second piston cylinder; the liquid inlet pipe is respectively connected with the first liquid inlet channel and the second liquid inlet channel, and is provided with one-way valves on the first liquid inlet channel and the second liquid inlet channel; a switching valve is arranged on the pump body; the liquid outlet pipe can communicate with the first liquid discharge channel or the second liquid discharge channel through the switching valve; and pistons and piston rods are respectively mounted in the first piston cylinder and the second piston cylinder. The stable high-pressure medical pump comprises two piston cylinders, uses an asynchronous continuous pressing mode of double pistons to realize reciprocating motions of the double pistons, matches with the one-way valves and the switching valve to realize no-gap continuous high pressure, overcomes the fluctuation problem of a water jet scalpel, and keeps excellent cutting performance of the water jet scalpel under constant pressure.

The invention discloses a vacuum pressure swing adsorption system operating under constant pressure and a control process thereof, comprising an adsorption tower, a fan and a vacuum pump. The adsorption towers are divided into three groups, and each group is composed of two adsorption towers. The operation modes of primary pressure drop, secondary pressure drop, vacuum analysis, secondary pressure rise, primary pressure rise, and feeding are cycled. The present invention is a six-column process. Through the optimal control of its own process, secondary pressure equalization is adopted in the adsorption and vacuum analysis process. Compared with the existing 2 to 5 tower process, the fluctuation range is reduced because the number of pressure equalization is one more time. It solves the pressure fluctuation problem of the system itself, and can be used to solve the pressure fluctuation problem of the fan outlet and the pressure fluctuation problem of the vacuum pump, so that the system can run smoothly.

The invention provides a transfer synchronizing mechanism of a high-temperature and high-pressure formation fluid analysis meter. The transfer synchronizing mechanism comprises two high-precision motors (1-1 and 1-2), two high-precision right-angle speed reducers (2-1 and 2-2) connected with the two high-precision motors (1-1 and 1-2) respectively, a host A (3) connected with the high-precision right-angle speed reducer (2-1), a host B (4) connected with the high-precision right-angle speed reducer (2-2), a metal high-pressure line (5) used for connecting the host A (3) and the host B (4), a synchronizing controller (7) connected with the high-precision motor (1-1) and the high-precision motor (1-2), and synchronous control cables (6) used for being connected with the two high-precision motors (1-1 and 1-2) and the synchronizing controller (7) respectively. The high-precision servo motors and the high-precision right-angle speed reducers are adopted, so that the feeding quantity of the host A and the supplementary quantity of the host B are controlled to be consistent, and pressure is also stabilized.

Embodiments of the present invention provide a compensation method, device, excavator and processor for hysteresis of proportional valve of an excavator. The excavator includes a main pump, a controller and a proportional valve. The method includes: acquiring a target action of the main pump; The target action is to generate a corresponding PWM signal; superimpose the dither signal on the PWM signal; and output the PWM signal after superimposing the dither signal to the proportional valve to reduce the hysteresis of the proportional valve. By optimizing the controller program, the hysteresis of the proportional valve is compensated and improved without changing the electro-hydraulic control system and the original PWM output frequency. At the same time, because the PWM output signal is constantly changing and responding, the control accuracy of the proportional valve is greatly improved, and the error when the controller adjusts the proportional valve for reciprocating motion is reduced, which significantly improves the accuracy and stability of the hydraulic system.

The invention discloses a continuous cooking anti-reverse spraying device. The device mainly comprises a frequency-variable transmission system, a feeding spiral shaft, a throat pipe, a push-stopping valve, a pressure-stabilizing tank and an air source stabilizer. The device is mainly characterized in that: the rotation speed of the feeding spiral shaft can be automatically adjusted according to the flow change of materials, so a pushing force is kept stable. The working pressure of an air source is not affected by external environment and is kept constant through the air source stabilizer, so that 'material plug' is not damaged by the fluctuation of flow pressure in a feeding process, and the aim of preventing reverse spraying in a continuous cooking and feeding process is fulfilled.