62results about How to "Guaranteed pressure stability" patented technology

The invention aims to provide a thermal vibration joint test device and method of a flange sealing structure under complicated loaded conditions. A flange sealing structure to be tested is arranged between a flange of a force applying pipe section and a flange of a force bearing pipe section; then the force applying pipe section and the force bearing pipe section are fixed on a bottom plate in a test box body; the test box body is arranged on the surface of a vibration platform; heating devices are arranged around the force applying pipe section and the force bearing pipe section; a gas with a predetermined pressure value is charged into the force bearing pipe section through a pressurized gas input and monitoring pipeline; an adjusting pull rod applying axial force applies axial force to the force applying pipe section; and an adjusting pull rod applying lateral force applies lateral force to the force applying pipe section. Through the invention, the sealing performance of the flange sealing structure after high-temperature vibration under the flange loaded condition can be checked, and real-time detection of the sealing performance is realized.

The present invention relates to an apparatus for field-flow fractionation and to a method for separating samples by means of field-flow fractionation using this apparatus. The apparatuses of the invention comprise a separation channel which, in addition to a first outlet for sample-containing solvent, comprises a second outlet for sample-free solvent, wherein the second outlet is arranged in a region of the separation channel from which sample-free solvent may be removed during elution and a flow volume control device is arranged downstream of the second outlet. They are characterized in that the flow volume control device is a mass flow controller.

The invention relates to an agricultural seeding device, in particular to a suction type precision seed bunch planting device. The suction type precision seed bunch planting device mainly comprises a seed tank (26), a suction type seed sorter, a roller, a negative pressure air suction pipe (6), a speed shifting mechanism and a seed receiving and delivering device, wherein the suction type seed sorter is arranged in the roller and communicated with the negative pressure air suction pipe (6); a seed delivering box (47) is arranged between a seed outlet of the suction type seed sorter and a duck nozzle (42); a main shaft (4) of the roller is a hollow pipe; a main shaft (9) of the suction type seed sorter is arranged in the hollow pipe-shaped main shaft (4) of the roller; one end of the main shaft (9) of the suction type seed sorter is coupled to the suction type seed sorter through a bearing (8.1) and drives a seed suction disk (33), and the other end of the main shaft (9) of the suction type seed sorter passes through a sealing bearing (8) in the main shaft (4) of the roller; the main shaft (4) of the roller and the main shaft (9) of the suction type seed sorter are in speed-shifting connection through a gear or a chain or a notched belt. The suction type precision seed bunch planting device has the advantages of increasing the inner space of the roller as much as possible, increasing the height of the seed delivering box simultaneously, conveniently regulating the rotating speed ratio of the roller to the seed absorption box according to the agronomic requirements, and greatly improving the seeding speed while seeding accurately. Due to the unique transmission structure, the suction type precision seed bunch planting device is compact and steady, and the fault rate is reduced obviously under the environment of worse working condition.

The invention discloses an energy-saving type prior unloading valve which belongs to the technical field of hydraulic steering systems of engineering machinery. The energy-saving type prior unloading valve comprises a valve body, a prior valve core, a sliding valve, an unloading valve core and an LS control plug screw, wherein an oil channel CF, an oil channel P, an oil channel P2, an oil channel P1 and a return oil channel T1 are formed in a valve hole of the prior valve core; and the oil channel P2, a return oil channel T, an oil channel LS and an unloading safety valve guide return oil channel T2 are formed in a valve hole of the unloading valve core. A load sensing complete hydraulic steering hydraulic system is formed by the energy-saving type prior unloading valve together with a load sensing steering gear and a steering pump, the sliding valve is additionally arranged, and the movement of the sliding valve is controlled through the pressure of the steering gear LS, so that the divided and combined flow high/low pressure control is realized, and the steering prior is ensured; and when a loader is not steered, steering pump hydraulic oil is subjected to prior valve flow combination or load oil returning under the lower pressure, so that the pressure loss of the steering pump combination or the load oil returning in the working condition that the loader is not steered is reduced, the unnecessary energy loss of the system is reduced to the maximum extent, the oil temperature is lowered, and the energy saving effect is effectively achieved.

The invention discloses a component type high-pressure common rail device. A common rail pipe is provided with a pressure sensor and a pressure limiter. The common rail pipe comprises an inner pipe and an outer pipe; a circumferential limit device is arranged between the inner pipe and the outer pipe; the two ends of the outer pipe are fixedly sleeved with a seal cover and the seal covers are used for sealing the two ends of the outer pipe; the circumferential surface of the common rail pipe is provided with an oil inlet and multiple oil outlets; and on the inner circumferential surface of the inner pipe, an annular inward-convex table stretching along the circumferential direction of the inner pipe is respectively arranged between the oil inlet and an oil outlet adjacent to the oil inlet and between two adjacent oil outlets. The component type high-pressure common rail device disclosed by the invention can improve the pressure stability in the common rail pipe, reduce the fluctuation of pressure, and guarantee stability of fuel injection of the high-pressure common rail system.

The invention discloses a reaction kettle, device and method for testing the solubility of natural gas under high-temperature and high-pressure conditions. The reaction kettle comprises a kettle body and a heating device, wherein the kettle body is internally divided into a dissolution reaction cavity and a gas pressurization cavity, the gas pressurization cavity is internally divided into a pressurization cavity I and a pressurization cavity II, and a buffer cavity is formed in the pressurization cavity I; a high-pressure sealing piston is arranged in the pressurizing cavity II to divide the pressurizing cavity II into a first pressurizing cavity II and a second pressurizing cavity II; the dissolution reaction cavity is provided with a gas sampling port, a temperature sensor, a pressure sensor and a liquid inlet/outlet; the pressurizing cavity I is provided with an air source inlet, a one-way valve I is arranged in the air source inlet and connected with the buffer cavity, the buffer cavity is connected with the dissolution reaction cavity through an air outlet pipe I, and a one-way valve II is arranged on the air outlet pipe I; and the buffer cavity is connected with a first pressurizing cavity II through a gas outlet pipe II, spacer fluid is arranged in a second pressurizing cavity II, and a pressure-bearing liquid inlet is formed in the second pressurizing cavity II. The device can accurately measure solubility of natural gas under high temperature and high pressure.

The invention discloses a pressure relief structure, a booster pump and water purification equipment. The pressure relief structure comprises a pressure relief cavity shell and a pressure relief cover, wherein a pressure relief cavity is defined by the pressure relief cavity shell in an enclosed mode, and the pressure relief cavity shell is provided with a pressure relief opening communicating with the pressure relief cavity; and the pressure relief cavity shell is covered with the pressure relief cover, a sealing part is arranged between the pressure relief cover and the cavity wall of the pressure relief cavity, the sealing part surrounds the pressure relief opening, the pressure relief cover is further provided with a pressure relief gasket, and the pressure relief opening is blocked or opened by the pressure relief gasket. According to the technical scheme, the sealing capacity and pressure stabilizing capacity of the pressure relief structure of the booster pump can be improved.

The invention provides an air bath control device which has a double-layer air bath structure that comprises an air pressure equalizing unit and an air releasing unit. The air pressure equalizing unitperforms pressure reduction on input air through a plurality of pipes for obtaining uniform-pressure air, and conveys the input gas to an edge through pipe. The air releasing unit comprises a plurality of air bath outlets, thereby releasing the uniform-pressure air through the air bath outlets, and forming thin-film air bath. The air bath control device provided by the invention has an ultrathinstructure and can be used in a compact space, thereby setting a problem of overlarge dimension of an existing air bath structure.

The invention relates to a water stop structure for a water inlet device of a toilet bowl. The structure comprises a water inlet valve and a lever support, wherein a ventilation seat stand is arranged at the center of the top surface of the water inlet valve, and a ventilation hole is formed in the surface of the ventilation seat stand. The structure is characterized in that convex edges are arranged on the two sides of the ventilation seat stand, the convex edges are connected with a pressing round cover in a clamped mode, a round groove is formed in the top of the interior of the pressing round cover, the round groove is filled with a sealing gasket, and a spring is connected to the outer side of the round groove in a sleeved mode; the lever support is clamped on the pressing round cover, a shaft hole is formed in the lever support, a lever swing arm is movably connected to the lever support through a rotary shaft and the shaft hole, a cam surface is arranged on one side of the lever swing arm and is in contact with the top surface of the pressing round cover in an abutting mode, and a slide-guiding groove is formed in the other side of the lever swing arm and is connected with a lifting rod connected to a float. The structure has the advantages of being small in structural member size, capable of achieving linkage transmission, high in lever ratio, suitable for high-pressure water supply and convenient to install and use.

The invention provides a self-pressure type temperature reduction dust removing system using a coal mine water-bearing stratum, relates to the technical field of air regulating, and solves the technical problem of the dust removing and temperature reducing performed by wasted coal mines by repeatedly using air. The system comprises a coal mine tunnel, a ventilation mechanism, a water taking mechanism and a temperature reducing and dust removing mechanism, wherein the ventilation mechanism is arranged in the coal mine channel, the water taking mechanism takes water from the water-bearing stratum on the upper part of the coal mine, the temperature reducing and dust removing mechanism is arranged in the channel to reduce temperature and remove dust using the water obtained by the water takingmechanism, the coal mine channel comprises a primary shaft, a secondary shaft, a shaft bottom yard and a large channel, and the temperature reducing and dust removing mechanism comprises atomizing nozzles, a water pipe and a dust removing net. The system has the advantages that water is constantly supplied for the temperature reducing and dust removing system by using the original channel and ventilation system of the coal mine and natural water pressure of the water-bearing stratum, so that the automatic operation of the temperature reducing and dust removing mechanism of the system is achieved, and the implementation cost is low.

Disclosed are a fuel tank cap and a fuel tank. According to the technical scheme, the fuel tank cap is characterized by comprising an outer cap body and an inner cap body, the outer cap body is used for being in threaded connection with a fuel tank opening, the inner cap body is arranged in the outer cap body and can be telescopically adjusted along the outer cap body, a baffle ring used for installing a first sealing ring is fixed to the periphery of the inner cap body, and an adjusting cavity is formed in the inner cap body; the adjusting cavity is sealed and filled with buffering media, an adjusting plug is connected in the adjusting cavity in a piston mode and can be adjusted in the telescopic direction of the inner cover in a piston mode, an adjusting rod is fixedly connected to one end of the adjusting plug, and the other end of the adjusting rod penetrates through a first through hole in the end of the inner cover and is fixedly connected with the outer cover. The adjusting rod and the first through hole are sealed. Pressure on the inner side and the outer side of the oil tank can be balanced, the pressure stability of the oil tank is kept, the tightness degree of the oil tank cover during covering can be improved, and the covering stability of the oil tank cover is improved.

The invention discloses a lithium ion pole piece rolling constant-pressure device. The device comprises an oil tank, a pipeline switch, an electronic plunger valve, a filter, a hydraulic platform, a pipeline valve, an electronic butterfly valve, a regulating valve, a high-pressure pipeline, a rolling structure and a PID servo controller. The hydraulic platform is provided with an overflow valve, an anti-explosion valve, a return pipe, an external pipe, an energy storage tank and a hydraulic output pipe. The filter supplies filtered and purified hydraulic oil to the hydraulic platform, and the hydraulic platform is provided with pressure stabilizing devices such as the overflow valve, the anti-explosion valve and the energy storage tank; and the PID servo controller carries out PID valve adjustment according to the program logic controller to keep the pressure constant. A real-time monitoring and real-time adjusting mode is utilized to ensure the constancy of the pressure of the pipeline. The pressure supply speed and frequency are calculated through real-time calculation including a consumed pressure time curve, the magnitude of supply pressure and the magnitude of pressure received by the tail end (or the process loss amount). The device has the technical advantages that pressure control is accurate, the corresponding speed is high, and pressure changes are adjusted in real time.

The invention relates to the field of lubricating oil preparation. The invention particularly discloses magnetic lubricating oil and a preparation method thereof. The magnetic lubricating oil comprises the following components, 30 parts to 50 parts of synthetic base oil, 30 to 50 parts of hydrofining solvent oil, 5 to 15 parts of a viscosity index improver, 0.2 to 0.5 part of a pour point depressant, 0.2 to 1 part of a composite oxidation and corrosion inhibitor, 0.2 to 1 part of an antioxidant, 0.2 to 1 part of an antirust agent, 0.0005 to 0.002 part of an antifoaming agent and 1 to 5 parts of magnetic particles. The magnetic particles can be automatically gathered and diffused through the change of the surrounding magnetic field intensity, so that the viscosity of an oil product is changed, and the change of the viscosity of the oil product and the change of the oil film intensity are realized.

The invention discloses a phase change heat storage type falling film evaporator which comprises a cavity, a pipe assembly, and a liquid material distributor; the cavity comprises a liquid material chamber, an evaporation chamber and a heating chamber which are arranged in the cavity from top to bottom; the liquid material chamber and the evaporation chamber are separated by a falling film guide plate; the evaporation chamber and the heating chamber are separated by a sealing baffle plate; the pipe assembly comprises a falling film evaporation pipe, a metal heat pipe and a phase change heat storage material; and the liquid material distributor is arranged at the top of the liquid material chamber and is used for uniformly distributing liquid materials. According to the evaporation device,the temperature and heat flow stability in the evaporation process is achieved through the high heat storage density characteristic and the phase change constant temperature characteristic of the phase change material, meanwhile, medium-free flowing heat transfer in the evaporation pipe is achieved through the metal heat pipe, and therefore the problems existing in an existing falling-film evaporator are solved.

The invention provides a runner cone pressure resistance test device of an axial-flow Kaplan turbine and a control method. The runner cone pressure resistance test device is characterized in that a hydraulic system pipeline connected with a turbine runner hub runner cone is provided with an overflow valve, a first intelligent pressure switch and a second intelligent pressure switch; the overflow valve is used for controlling the highest working pressure of a system; the first intelligent pressure switch is used for starting an oil pump when the system pressure is lower than a preset low pressure value; and the second intelligent pressure switch is used for closing the oil pump when the system pressure is higher than the preset high pressure value. The runner cone pressure resistance test device can guarantee the pressure stability of the runner cone in the pressure-resistant test process effectively, is convenient to use, is high in automation degree, and enables the efficiency to be greatly improved.