2270 results about "Plunger pump" patented technology

The invention discloses a plunger pump fault diagnosis method and device, a medium and equipment. The method comprises the following steps: acquiring a pressure signal and an original vibration signal of the plunger pump; acquiring data in different states; obtaining frequency domain information based on continuous wavelet transform; performing multi-source data fusion; acquiring a global dependency relationship between the input and the output based on an encoder; and the fault of the plunger pump is diagnosed. By introducing a multi-source data fusion method, time domain and frequency domain signals collected by different types of sensors are comprehensively processed, so that information of different data sources is effectively integrated, and the accuracy and comprehensiveness of fault diagnosis are improved; important features in fault signals are automatically recognized and weighted through the Transform model, the extraction precision of fault features is improved, the model can effectively learn the fault features in a few-sample environment by optimizing a network structure and training parameters in the training process, and the diagnosis precision is remarkably improved.

A plunger pump packing assembly includes a header ring, and one or more seals. The plunger pump packing assembly operates as a scal between a static component and a dynamic component (e.g., reciprocating plunger). The header ring has a vented inside portion to prevent trapping pressure on the outer diameter of the header ring or between the header ring and adjacent seals or packing rings. The vents allow trapped pressure to return when the pumped fluid pressure is lower. A radially protruding edge on the outer diameter of the header ring significantly reduces or prevents migration of abrasive media, such as proppant, between the header ring and the static component. In some examples, the header ring does not contact the dynamic component, thus preventing the trapping of abrasive media particles between the header ring and the surface of the dynamic component.

The present application discloses a coaxially integrated servo motor pump with integrated drive control functions, comprising a motor pump housing, a controller housing, and an electrical connector. The motor pump housing is provided with a blind hole, a first cavity for accommodating a plunger pump assembly, and a second cavity for accommodating a servo motor assembly, wherein the plunger pump assembly and the servo motor assembly are connected via a rotating shaft. The controller housing is connected to one end of the motor pump housing, and a drive controller is provided within the controller housing. The blind hole communicates with the second cavity, and the electrical connector is sealed and connected to the blind hole, and the electrical connector is electrically connected to the servo motor assembly and the drive controller. The distribution plate and the sealing assembly are respectively sealed with both ends of the motor pump housing. Cooling is achieved through a cooling oil channel, which connects from one end of the motor pump housing near the plunger pump assembly to the second cavity and then divides into two paths, one path passing through the center of the rotating shaft, and the other path connecting to the first cavity and passing through the distribution plate. The coaxial integration of the drive control functions is achieved, and the cooling effect is good.

The present invention discloses an electronically controlled evaporator and its control method. The electronically controlled evaporator includes: a medicine storage module, a plunger pump system, and a valve seat module; the medicine storage module includes a medicine tank, a medicine lid, and a bent plate; the plunger pump system is composed of a cylinder block, a piston rod, a floating joint, a lead screw, a pump motor, a pipe joint, etc., to realize the suction and pushing of anesthetic liquid; the valve seat module includes a valve seat, an air outlet, a diffusion joint, an air inlet, a lower valve plate of the evaporation core, an upper valve plate of the evaporation core, an evaporation core motor, an evaporation core spring, a ferrule, a switching valve motor, an upper valve plate of the switching valve, a lower valve plate of the switching valve, etc., to realize the on / off of the anesthetic liquid and the volatilization of the anesthetic. The anesthetic output by the plunger pump of the present invention can quickly volatilize and mix with fresh gas when entering the evaporation core, thereby realizing precise control of the anesthetic concentration. At the same time, when it is necessary to close the anesthetic output, the anesthetic liquid outlet can be quickly closed.

The invention discloses a corrosion-resistant radial plunger pump with a self-cleaning function, and relates to the technical field of radial plunger pumps, the corrosion-resistant radial plunger pump comprises a shell of a hollow structure, a vertically-arranged partition plate is fixed to the center of the interior of the shell in the length direction of the partition plate, and the length direction of the partition plate is perpendicular to the length direction of the shell; the partition plate divides the interior of the shell into two cavities, and the drainage plate is rotationally connected to one end, in the length direction of the partition plate, of the partition plate; according to the device, through cooperation of the drainage mechanism, the driving mechanism, the filter screens and other components, when the filter screen on one side is blocked, the filter screens generate displacement under the action of negative pressure suction, then the drainage plate is driven to turn, switching of the flowing direction of liquid flow is achieved, the blocked filter screen can be cleaned, the conveying work cannot be stopped, manual intervention is not needed in the process, and the working efficiency is improved. And shutdown operation is not needed, so that the production interruption time caused by blockage of the filter screen is shortened, the production efficiency is improved, and the maintenance frequency is reduced.

The utility model belongs to the technical field of glue supply, and particularly relates to a high-pressure fluid supply device which comprises a bearing base, first power cylinders are fixedly installed above the left end and the right end of the bearing base respectively, an air control box is fixedly installed on the right side wall of the first power cylinder on the right side, and a pressure plate pump is fixedly installed at the top end of each first power cylinder. A second power air cylinder is fixedly installed in the middle of the bottom end of the pressure plate pump, the output end of the second power air cylinder is fixedly connected with a plunger pump, a glue outlet is formed in the front outer wall of the top of the plunger pump, a pressure plate body is fixedly installed at the bottom of the plunger pump, and an exhaust assembly is installed on the upper front portion of the pressure plate body. The whole plunger pump is made of 304 stainless steel materials, has high strength and good corrosion resistance, the maximum working pressure is 440 bar, and the plunger pump is convenient to meet the operation requirement of high-pressure fluid supply.

The invention discloses an oil supply control system of a hydraulic pump station, and relates to the technical field of hydraulic systems. The oil supply control system of the hydraulic pump station comprises an oil tank; the oil inlet end of the oil supply pump communicates with the oil tank, and the oil outlet end of the oil supply pump is connected to the oil suction end of the variable plunger pump through an oil supply path; a heat exchanger and a filter are sequentially arranged in the oil supply path and used for conducting temperature adjustment and particle filtration on oil. The oil supply path is connected with a bypass pipeline in parallel, the bypass pipeline is communicated with the oil tank through a one-way valve, the opening pressure of the one-way valve is smaller than 2 bar, and the one-way valve is used for guaranteeing the positive pressure of the oil suction end of the variable pump. The oil outlet end of the variable displacement piston pump is connected to an external hydraulic system and is provided with a high-pressure filter; the detection device is arranged in the oil supply path and used for collecting oil temperature and / or pressure signals; and the control module is connected with the detection device and the execution components and is configured to control the start and stop states of the oil supply pump, the variable displacement piston pump and the heat exchanger according to the comparison result of the detection result and a preset threshold value.

The invention relates to the technical field of rock / soil mass seepage-stress coupling, and discloses a rock-soil mass seepage-stress coupling visualization device and a test method thereof. The rock-soil body seepage-stress coupling visualization device integrates a seepage pressure system controlled by a high-precision plunger pump, a confining pressure and back pressure control system, a loading and measuring device and a visualization observation system composed of a PIV particle image measuring instrument and a three-dimensional XTDIC full-field strain measuring system, and an experiment platform with comprehensive and accurate functions is formed. The device not only can accurately control and measure the seepage pressure, but also can carry out permeability research on the rock / soil body in various stress states, and directly observes and records the seepage field and the structural evolution process in the rock / soil body through an intuitive visual means. The device not only improves the experiment efficiency, but also greatly enhances the intuition and accuracy of research, and provides powerful support for deeply understanding the microscopic and macroscopic behaviors of the rock / soil body under the seepage-stress coupling action.

A packing assembly to be disposed within a stuffing box defined by a fluid end of a body of a reciprocating plunger pump includes an elastomeric component and a wear component. The elastomeric component has an at least partially tapered inner diameter and an outer diameter and, in use, engages the stuffing box on the outer diameter and is axially compressed within the stuffing box. The wear component sealably engaging the elastomeric component across the at least partially tapered inner diameter and dynamically contacts the plunger to form a dynamic seal.

The invention relates to the technical field of plunger pumps, and discloses a valve body and a plunger pump, two valve bodies and two valve seat bodies are included, one sides of the bottom ends of the two valve bodies are each provided with a first leather sheath, the other sides of the bottom ends of the two valve bodies are each provided with a second leather sheath, and the left end and the right end of one side of each second leather sheath are each provided with an insertion groove; one end of the inserting block is fixedly connected to one side of the first leather sheath, an air bag is fixedly connected to the inner side wall of the inserting groove, and the bottom end of the air bag communicates with a pipeline. According to the valve body, the first leather sheath and the second leather sheath are placed on the outer side of the valve body, the inserting block enters the inserting groove, air is injected into the air bag so that the air bag can expand, and the gap between the inserting groove and the inserting block can be sealed; when the air bag is filled with air, the second spring can pull the sealing ball to move downwards and be tightly attached to the opening in the top of the base, the pipeline is plugged, and therefore a worker can conveniently fix the leather sheath to the outer side of the valve body.

Disclosed is a fracture plugging simulation experimental device and an experimental method thereof. The device comprises a simulated wellbore, a simulated formation, a simulated fracture, a plurality of pressure sensors and vales, a mixing barrel, a liquid injection port and a pressurization port, a liquid collection tank, a plugging fluid storage tank, a heating device, etc. The method comprises: loading the simulated formation with the simulated fracture in the simulated wellbore, closing the second valve and turning on the mixing device, injecting a lost circulation material into the mixing barrel, closing the liquid injection port and turning on the heating device and pressurizing, stopping pressurizing and opening the second valve to establish a plugging process, turning on the plunger pump to continue pressurizing, and collecting a fluid pressure change of the simulated fracture in the plugging process; and calculating a pressure-bearing capacity of plugged fracture.

A pumping system, comprising: a pump fluid end comprising a plurality of pump chambers, each pump chamber comprising a bore having a reciprocatable plunger disposed therein, a suction valve, and a discharge valve; a prime mover mechanically coupled to the fluid end [by a drivetrain] and configured to reciprocate the plungers; and a controller communicatively coupled to the prime mover, the fluid end, or both and configured to alert a user re a pump malfunction, initiate corrective action of the pump malfunction, or both in response to: (a) an indication of torque reversal during operation of the pumping system, (b) an indication of negative flow rate from the pump during operation of the pumping system, (c) an indication of leakage of (i) a single discharge valve in a 3-plunger pump or (ii) discharge valves associated with two plungers in adjacent firing order, or (d) any combination of (a)-(c).

The invention discloses a high-temperature supercritical carbon dioxide steady-state jet flow experiment device and method, and the device comprises a liquid storage tank, a liquid booster pump, a plunger pump, a first mass flow meter, a second mass flow meter, a heating section, a first electric control valve, a first-stage cooler, a second-stage condenser, a back pressure valve, and a main loop system composed of related pipe fittings and equipment. The gas supply system consists of a carbon dioxide gas cylinder group, a gas storage tank, a gas booster pump and related pipe fittings and equipment; and the jet experiment section consists of a spray pipe, a second electric control valve, an electric stop valve and related pipe fittings and equipment. The invention further provides an experimental method of the device. According to the invention, the steady-state jet flow experiment research of supercritical carbon dioxide under the high-temperature condition can be realized.

The invention belongs to the technical field of plunger sealing of high-pressure plunger pumps, and particularly relates to a high-pressure plunger pump plunger assembly self-compensation type abrasion-resistant sealing structure which comprises a high-pressure plunger pump body and an oil suction and outlet tank, the right end of the high-pressure plunger pump body is connected with the oil suction and outlet tank, and a fixing assembly is detachably installed at the right end of the interior of the high-pressure plunger pump body. And the right end of the fixing assembly communicates with the left end of the inner wall of the oil suction and outlet tank, a first sealing structure is detachably installed at the right end of the interior of the fixing assembly, and the high-pressure plunger pump main body is used for driving the first sealing structure to conduct fine opening and closing operation. The friction coefficient of the sealing structure is reduced, and the friction heat conductivity coefficient of the plunger assembly is reduced, so that the wear resistance of the sealing structure is improved, material aging caused by temperature rise is prevented, multiple times of self-compensation can be conducted on a wear gap, and then the durability of the sealing structure is greatly improved.

The invention provides an ultrahigh-pressure vertical plunger pump. The ultrahigh-pressure vertical plunger pump comprises a plunger pump base, a plunger pump body and a plunger pump cover. A transmission structure is arranged on the inner side of the plunger pump base, a receding hole communicated with an inner cavity of the plunger pump base is formed in the upper end of the plunger pump base, and the output end of the transmission structure extends into the receding hole. A water inlet hole is formed in the side wall of the plunger pump body, a high-pressure cylinder is arranged on the inner side of the plunger pump body, a water passing hole is formed in the side wall of the upper end of the high-pressure cylinder, a sealing bush is arranged in the high-pressure cylinder, a plunger shaft is slidably arranged on the inner side of the sealing bush, and the lower end of the plunger shaft is connected with the power output end of the transmission structure. An annular lubricating gap is formed between the sealing bush and the plunger shaft; a drainage channel is arranged on the inner side of the plunger pump cover, and a one-way valve structure is arranged at the joint of a water inlet of the drainage channel and an inner cavity in the upper end of the high-pressure cylinder. Compared with a sealing ring, the sealing bush has higher strength and higher wear resistance, and is not easy to wear in the use process.

The invention discloses a digital hydraulic pump controlled by a high-speed switch valve bridge. The digital hydraulic pump comprises a motor, a swash plate type axial plunger pump, a variable adjusting unit, a pressure compensation unit, a closed-loop control unit, an unloading unit and a filter. The motor is connected with the swash plate type variable displacement piston pump; the variable adjusting unit is connected with the swash plate type variable plunger pump; the pressure compensation unit is connected with the variable adjusting unit to carry out differential pressure compensation on the variable adjusting unit; the closed-loop control unit is connected with the variable adjusting unit and controls the output flow of the variable adjusting unit according to a feedback signal; the high-speed switch valve is subjected to pressure difference compensation through the pressure difference compensator, so that the flow of the high-speed switch valve is not affected by load changes any more, and output pressure fluctuation of the swash plate type variable displacement piston pump is reduced; a high-speed switch valve bridge serves as a pilot level, and digital accurate control over the output pressure of the hydraulic pump is achieved through a closed-loop control unit; the high-speed switch valves are connected in parallel, multi-stage flow output and differential flow control are achieved, and the control precision and the response speed of the digital hydraulic pump are improved.

The invention relates to the technical field of injection molding machine hydraulic control, in particular to an injection molding machine hydraulic pump control system and a control method thereof, and aims to solve the problems of high energy consumption, high cost or poor temperature control of a traditional hydraulic scheme. The system comprises a hydraulic oil tank, a driving unit and an oil way control module. The driving unit comprises a driving motor, and a fixed displacement pump and a plurality of swash plate type variable displacement piston pumps which are driven by the driving motor, and swash plates of the variable displacement pumps can be switched between negative and positive angles so as to adjust the displacement or actively suck oil; the oil way control module is provided with a flow collecting valve set capable of switching flow collecting / independent states of oil outlet ways of the constant displacement pump and the variable displacement pump, the integrated cooling unit forms an independent cooling filtering loop, the temperature and pressure adjusting assembly is combined with a temperature sensor to control temperature and adjust pressure, and the pressure limiting protection valve set is connected with the constant displacement pump and the variable displacement pump. And the pressure limiting protection valve is matched with a pressure sensor to realize overpressure protection. According to the invention, cost and energy saving are both considered, precise temperature control and pressure protection are realized, and system stability and plastic part forming precision are improved.

The invention relates to a plunger pump system, a control method and a filter press. The plunger pump system comprises an oil storage container, an oil pump device, a plunger device and a hydraulic device. The hydraulic device comprises two hydraulic assemblies, each hydraulic assembly comprises an oil cylinder and a piston, the piston divides the oil cylinder into a rod cavity and a rodless cavity, and the rod cavities of the two hydraulic assemblies or the rodless cavities of the two hydraulic assemblies are communicated with each other. The oil pump device and the hydraulic device are connected through an oil supply pipeline, a liquid flow reversing device and a one-way valve are connected to the oil supply pipeline, the flow direction of hydraulic oil in two branch pipelines of the oil supply pipeline is controlled by the liquid flow reversing device to be periodically switched, and the flow directions of the hydraulic oil in the branch pipelines are opposite at the same moment. One end of the electric control overflow device is connected between an oil pump device and a one-way valve, the other end of the electric control overflow device is connected with an oil storage container, and the electric control overflow device is controlled to conduct an oil outlet of the oil pump device and the oil storage container during reversing of the liquid flow reversing device and discharge impact of hydraulic oil reversing on the plunger pump system.

The present invention may disclose a turbine fracturing equipment, including a transporter, a turbine engine, a reduction gearbox, a transmission mechanism and a plunger pump, wherein an output end of the turbine engine may be connected to one end of the reduction gearbox, the other end of the reduction gearbox may be connected to the plunger pump through a transmission mechanism; the transporter may be used to support the turbine engine, the reduction gearbox, the transmission mechanism and the plunger pump; the transporter may include a chassis provided with a transport section, a bearing section and a lapping section which may be connected in sequence; while the turbine fracturing equipment may be in a working state, the bearing section can contact with the ground, while the turbine fracturing equipment may be in a transport state, the bearing section may not contact with the ground.

The invention discloses a novel energy-saving efficient hydraulic system of a rail unloading device. The novel energy-saving efficient hydraulic system comprises a hydraulic oil tank, a plunger pump set, a conveyor, a winch, a cooling mechanism and a radiator. The conveyor comprises bottom supporting wheels, conveying pressing wheels are arranged over the bottom supporting wheels, each conveying pressing wheel is provided with a pair of rail pressing oil cylinders, and the conveying pressing wheels are pressed on the steel rails through the rail pressing oil cylinders for conveying; the liquid inlet end of the plunger pump set is communicated with the hydraulic oil tank through a pipeline, the liquid outlet end of the plunger pump set is communicated with the motor liquid supply subsystem and the cylinder body liquid supply subsystem, the liquid outlet end of the winch motor is communicated with the liquid inlet end of the cooling mechanism through a liquid return pipeline, and the liquid outlet ends of the two conveying motors are communicated with the liquid inlet end of the cooling mechanism through the liquid return pipeline. The liquid outlet end of each rail pressing oil cylinder communicates with the liquid inlet end of the cooling mechanism through a liquid return pipeline, the liquid outlet end of the cooling mechanism communicates with the liquid inlet end of the radiator, the liquid outlet end of the radiator communicates with the hydraulic oil tank, the rail pressing oil cylinders, the rail conveying machine and the winch can be driven, and high efficiency and energy saving are achieved.

The invention relates to the technical field of mechanical hydraulic pressure, in particular to a low-pulsation plunger pump with a dynamic variable flow distribution pre-compression angle, the low-pulsation plunger pump with the dynamic variable flow distribution pre-compression angle comprises a plunger pump, a shell and an adjusting piece, the plunger pump is fixedly connected with the shell, an oil distribution cover is fixedly connected in the shell, the oil distribution cover is rotatably connected with a flow distribution plate, and the flow distribution plate is fixedly connected with the shell. A blocking piece is fixedly connected to the surface of the valve plate, a groove is formed in the surface of the oil distribution cover, a push rod is slidably connected into the groove, the blocking piece is connected with the push rod in an inserted mode, the push rod is elastically connected with a limiting plate, the limiting plate is in threaded connection with the adjusting piece through a screw rod, and an oil return opening is formed in the groove and communicated with the interior of the shell. The valve plate has the beneficial effects that in a dynamic balance state, the elastic force of the spring and the hydraulic force are balanced in real time, so that the pre-compression angle is automatically adjusted along with the pressure of the oil discharge kidney-shaped hole, and the pressure transition process is always in an optimal state, so that the valve plate can adapt to the working condition change, and the flow pulsation is effectively inhibited and optimized.

The invention provides a plunger pump fault online diagnosis method based on a rotating speed frequency amplitude, which belongs to the field of plunger pump state detection and mainly comprises the steps of pressure sensor data acquisition and processing, load pressure spectrum analysis and plunger pump fault diagnosis based on the rotating speed frequency amplitude. The method comprises the specific steps that a high-frequency pressure sensor is arranged at an outlet of a plunger pump, and real-time data input is provided for fault diagnosis; a pressure signal conditioning and digital-to-analog conversion device is built, data transmission is completed, and data interfering with fault diagnosis is eliminated; fourier transform is carried out on the processed pressure signal to extract the rotating speed frequency of the plunger pump; and the specific fault type is judged based on the corresponding relation between the rotating speed frequency amplitude of the plunger pump and the specific fault. According to the method, based on the difference of the rotating speed frequency component amplitudes of load pressure signals under different plunger pump friction pair abrasion fault types, the mapping relation between the rotating speed frequency amplitudes and the plunger pump friction pair abrasion fault types is established, and the plunger pump load pressure signals serve as data input; and the specific wear fault type of the friction pair of the plunger pump is monitored and evaluated in real time. According to the invention, state monitoring and condition-based maintenance of the plunger pump are facilitated.

The invention provides a hydraulic control pilot two-stage flow distribution static balance radial plunger hydraulic device and a working method, and relates to the technical field of radial plunger hydraulic devices. According to the scheme, the radial plunger hydraulic device is balanced through hydraulic control pilot two-stage flow distribution static force, flow distribution is controlled through external control pilot pressure, bidirectional rotation of a hydraulic pump motor and self-compensation after a valve plate is abraded are achieved by arranging an external control pilot oil way, and the service life is prolonged. In addition, by arranging the regular polygon driving type structure, regular polygon parts are additionally arranged between the crankshaft and the plunger, the transmission performance of the radial plunger pump is optimized, and friction force is reduced. By arranging the guide sleeve, the rubber cavity assembly and the return spring, the movement centering performance of the plunger can be effectively improved, leakage at the position of the plunger unit is reduced, and the complexity of the motor return device is simplified.

The invention discloses a method for designing a strong heat removal system integrated on a plunger pump, which comprises the following steps of: 1, determining a design target, and determining working condition characteristics and a working target of a design object in the plunger pump; 2, determining a global design point; 3, determining the displacement of the forced exhaust system; 4, size design of a forced exhaust system, wherein forced exhaust element design and inlet oil duct design are included; 5, plunger pump matching and optimization design are carried out; and 6, performing simulation calculation and experimental verification. The method can directly aim at shell return oil with the highest local temperature rise of the plunger pump, normal work of the plunger pump is not affected, the temperature rise restraining effect is remarkable, the structure is compact, and installation is convenient. In the design process of the plunger pump forced discharge system, theoretical calculation, simulation and test verification methods are comprehensively used for mutual verification, the design quality and precision can be improved, and the designed plunger pump forced discharge system is more feasible.

The invention provides a plunger pump stirring loss measuring device and method with a plunger-sliding shoe assembly stretching and retracting in a reciprocating mode. The plunger pump stirring loss measuring device comprises a reciprocating conversion module and a stirring loss measuring module. The reciprocating conversion module is used for achieving reciprocating telescopic motion of the integrated plunger-sliding shoe assembly and comprises a right-angle bent rod, a push-pull disc, a supporting frame and a base. And the stirring loss measuring module is used for measuring, calculating, recording and displaying the stirring loss of the plunger pump. And under the state that an oil stirring area of the stirring loss measurement module is filled with hydraulic oil and the state that the hydraulic oil is emptied, the torque borne by the integrated cylinder-main shaft is measured respectively, and the difference between the two measurement results is calculated to obtain the stirring loss of the plunger pump. According to the invention, the phenomenon of'pump burning 'of the dry type shell is avoided by stripping mechanical loss generated by a friction pair of the rotating assembly, the quasi-real working condition of reciprocating telescopic motion of the plunger-sliding shoe assembly is fully considered, and accurate measurement of the stirring loss is realized.

A fracturing apparatus includes a motor, a first plunger pump, a power supply platform, a gas turbine engine, a generator, and one or more rectifiers. At least two of the gas turbine engine, the generator, and the one or more rectifiers are arranged on the power supply platform. A first end of the generator is connected to the gas turbine engine. A second end of the generator is connected to the one or more rectifiers. The generator is configured to output a voltage to the one or more rectifiers. The one or more rectifiers are configured to provide power to the motor. The motor is configured to drive the first plunger pump.

The invention relates to the technical field of industrial automation, and discloses a multi-mode switching control method for a variable displacement piston pump driven by a servo motor, which comprises the following steps of: acquiring multi-dimensional operation state parameters and load power of a variable displacement piston pump system; performing dynamic mode decomposition on the load power signal, and executing preset state switching compensation mapping to complete mode switching on the basis of the extracted mode characteristics and the current state parameter under the condition of judging that the switching condition is satisfied; executing a corresponding control strategy in the new mode, and dynamically adjusting the pump displacement and the rotating speed of the servo motor through feedback control; and detecting the response and energy efficiency performance of the regulation and control system according to the performance index in the system operation process. By adopting a dynamic mode intelligent switching mechanism, the system can automatically match the optimal operation mode in different working environments, the energy utilization efficiency is greatly improved, and the effects of effectively reducing energy waste and reducing the total energy consumption of the system during stable load or low load operation are achieved.

The invention discloses a biomass supercritical water gasification hydrogen production and fuel cell hydrogen-electricity coupling system which comprises a supercritical water gasification reactor, a material conveying system, a preheating and heat regeneration system, a gas-liquid separation system, a combustion gas combustion system, a hydrogen purification system and a hydrogen fuel cell system. The material conveying system comprises a storage tank, a high-pressure slurry conveying device, a first high-pressure plunger pump and a water tank; the preheating and heat regeneration system comprises a heat regenerator, a preheater and a second high-pressure plunger pump; the gas-liquid separation system comprises a back pressure valve and a gas-liquid separator; the fuel gas combustion system comprises a combustion gas combustion device and a combustion gas storage tank; the hydrogen purification system comprises a hydrogen purification device, a combustion gas storage tank and a hydrogen storage tank. The supercritical water gasification reaction system and the hydrogen fuel cell power generation system are coupled, hydrogen is directly generated and efficiently converted into electric energy, the advantages of being environmentally friendly and clean are achieved, and efficient utilization of biomass resources is achieved.

The invention belongs to the related technical field of plunger pumps, and discloses a leakage-free oil-water separation type plunger pump which comprises a cylinder body, a lining, a large plunger, a small plunger and an elastic sealing piece. A third groove is formed in one end of the cylinder body, a first through hole is formed in the bottom face of the third groove in a penetrating mode, and the first through hole is used for containing the large plunger; one end of the bushing is arranged in the third groove; the small plunger is step-shaped, and a first step surface is formed on the small plunger; one end of the small plunger is positioned in the bushing, and the other end of the small plunger penetrates through the elastic sealing element and then is connected to one end of the large plunger positioned in the cylinder body; the first step face and the large plunger press the middle of the elastic sealing piece to form inner-layer sealing, the lining and the bottom face of the third groove press the outer edge of the elastic sealing piece to form outer-layer sealing, and the inner-layer sealing and the outer-layer sealing are jointly used for isolating a working medium and a lubricating medium which are located on the two opposite sides of the elastic sealing piece respectively. And oil-water mutual seepage is prevented.

The invention belongs to the technical field of liquid pumps, and particularly relates to a plunger pump. Four plunger holes are distributed in the pump head in a matrix mode, water inlet one-way valves are arranged in the four plunger holes, a water outlet pipeline communicated with the corresponding plunger hole is arranged on the pump head beside each plunger hole, a first water outlet one-way valve is arranged in each water outlet pipeline, a water catchment channel is further arranged in the pump head, and the water catchment channel is communicated with the water outlet pipelines through communicating holes. The water outlet hole is communicated with the water catchment channel, and a second water outlet one-way valve is arranged on the water outlet hole; the pump head is further provided with a water return channel and a pressure regulating valve hole, the water return channel, the pressure regulating valve hole and the water catchment channel are communicated, and a pressure regulating valve is arranged in the pressure regulating valve hole. The water outlet hole and the pressure regulating valve hole are obliquely formed in the pump head, and the outer ends of the second water outlet one-way valve and the pressure regulating valve extend out of the pump head and are located on the two sides of the water inlet hole; the four plunger holes are distributed in a matrix mode to replace a traditional linear side-by-side layout to share the same water catchment channel and the same water return channel, and space and materials are saved.