92results about How to "Overcome leaks" patented technology

The invention discloses a composite phase-change energy storage material for microcapsules and a preparation method thereof. The coating of the microcapsule is made of silicon dioxide, and the core of the microcapsule is made of a phase-change energy storage material, wherein the phase-change energy storage material is a paraffin organic solid-liquid phase-change energy storage material. 0.2 to 0.5 wt.% of dispersed emulsifier, 52.5 to 62.5 wt.% of solvent water, 18.75 to 31.5 wt.% of phase-change energy storage material and 15.5 to 18.75 wt.% of inorganic silica source are matched and put into a reactor for stirring for 5 to 8 hours; the mixture is uniformly dispersed and emulsified at the temperature 3 to 8 DEG C higher than that for solid-liquid phase change; hydrochloric acid aqueous solution catalyst with the pH value of 0.93 to 4.07 or sodium hydroxide aqueous solution catalyst with the pH value of 8.0 to 12.0 is added into the emulsion; the reacting solution is naturally cooled to room temperature and precipitation solution is obtained; the precipitate is washed with the combination of water and petroleum ether, wherein the mass percent of the petroleum ether is 30 wt.%; then the precipitate is washed with deionized water and is filtered, and the product is naturally aired. The invention improves the technology of phase-change energy storage and conservation, and has the function of automatic temperature regulation, favorable physical and chemical stability, crack resistance, flame retardancy, wear resistance and high thermal conductivity.

An oilfield ultrahigh-pressure acid-resistant rubber seal material comprises, by weight, 85-65 parts of hydrogenated butadiene-acrylonitrile rubber, 15-35 parts of butadiene-acrylonitrile rubber, 5-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of an antioxidant, 50-65 parts of nanometer carbon black, 15-25 parts of white carbon black, 5-10 parts of a phenolic resin, 5-10 parts of a softener, 3-6 parts of a peroxide vulcanizing agent, 6-8 parts of a vulcanizing aid, 1-3 parts of sulfur, and 2-4 parts of a promoter, wherein the sum of the weight parts of the hydrogenated butadiene-acrylonitrile rubber and the butadiene-acrylonitrile rubber is 100. A seal ring made through adopting the rubber seal material can satisfy the seal of oilfield high-pressure acid-resistant liquid (hydrochloric acid or hydrofluoric acid) pipelines, and overcomes the leakage and torn edge extrusion phenomena of seal members under a high hydraulic pressure.

A self-control heating and cooling water mattress comprises a temperature control system which consists of liquid filling pads, a heat exchanger, a throttling device, a compressor and a controller. An upper liquid filling mattress and a lower liquid filling mattress are arranged in a mattress frame and are both filled with water or other liquid; and an insulation layer is arranged between the upper liquid filling mattress and the lower liquid filling mattress; an upper heat exchanger is arranged inside the upper liquid filling mattress and a lower heat exchanger is arranged inside the lower liquid filling mattress. When the upper liquid filling mattress is used as a cool mattress, the upper heat exchanger functions to be an evaporator and the lower heat exchanger as a condenser; the heat from human body is then absorbed by the upper liquid filling mattress and dissipated through the lower liquid filling mattress. If the upper liquid filling mattress is used as a warm mattress, the upper heat exchanger is changed into the condenser and the lower heat exchanger into the evaporator; the heat in the lower liquid filling mattress is absorbed by the lower heat exchanger and dissipated through the upper heat exchanger. People then feel warm by absorbing the heat from the upper liquid filling mattress.

The present invention provides a gate driver basing on IGZO process, comprising: GOAs in cascade connection comprising a Nth-stage GOA, wherein the Nth-stage GOA further comprising: a pull-up control part 100, a pull-up part 200, a transfer part 300, a pull-down part 400, a pull-down holding part 500, a boost part 600, a first negative supply VSS1, a second negative supply VSS2, a third negative supply VSS3, which are three gradually decreasing negative supplies and pull down an output terminal G(N), a first node Q(N), a second node P(N), and a driving single ST(N) to prevent the electrical leakage of TFTs effectively. And channels of the TFT switches of the gate driver basing on the IGZO process are oxide semiconductor channels.

A device for maintaining a desired inflation pressure within a tire mounted on a wheel of a vehicle which includes a flexible compression chamber and a magnetic element not on the wheel. As the compressor passes the magnet each wheel revolution, a small amount of atmospheric air is pumped into the tire, if needed. The magnet and the compressor need no other contact with the vehicle or the wheel and require no energy source on the wheel.

The invention discloses an aluminum foil surface intaglio printing ink. The aluminum foil surface intaglio printing ink is prepared by using 30-35% of polyurethane resin, 10-15% of polyester resin, 8-12% of carbon black, 30-37% of a solvent, 2-3% of an assistant and 10-20% of a filler. The ink provided by the invention has a very good bonding performance with aluminum foil, overcomes the bare phenomenon due to oil stains on the surface of the aluminum foil, and has the characteristics of fast drying speed and good water resistance.

The invention discloses an atomizer with an integrated horizontal atomizing core, comprising a mouthpiece, a liquid storage shell, an upper atomizing seat, a lower atomizing seat, the integrated horizontal atomizing core and a bottom cover; the integrated horizontal atomizing core includes an atomizing tube, a tubular liquid storage, a tubular electric heating core, an isolating ring and an electrode cap; the tubular liquid storage and atomizing tube herein can insulate heat and prevent radiation, and burn of the atomizing seats due to high heat when an electric eating wire operates directly in the atomizing seats is avoided; the tubular liquid storage and the tubular electric heating core can fully absorb electronic cigarette tar, direct erosion by the electric heating wire due to insufficiency of a conductive liquid is avoided, and the failures are overcome that, for instance, the atomizer easily leaks liquid during operating at high temperature, little smoke is produced and burnt smell occurs.

The present invention provides a gate driver circuit basing on IGZO process, comprising GOAs in cascade connection comprising a Nth-stage GOA, wherein the Nth-stage GOA further comprising a pull-up control part 100, a pull-up part 200, a transfer part 300, a pull-down part 400, a pull-down holding part 500, a boost part 600, a first negative supply VSS1, a second negative supply VSS2, a third negative supply VSS3, which are three gradually decreasing negative supplies and pull down an output terminal G(N), a first node Q(N), a second node P(N), and a driving single ST(N) to prevent the electrical leakage of TFTs effectively. And channels of the TFT switches of the gate driver circuit basing on the IGZO process are oxide semiconductor channels.

The invention discloses a porous magnetic starch microsphere and a preparation method thereof. The method is characterized in that organic peroxide-surface modified Fe3O4 magnetic particle is used as a nucleus, mineral oil is used as a continuous phase, starch molecules and the magnetic nucleus are combined through reversed-phase polymerization reaction to form a magnetic starch micro sol particle with a nuclear-shell structure, the starch molecules on a shell layer are subjected to cross-linking reaction under the action of cross-linking agent-epoxy chloropropane, so that the magnetic starch micro sol is gelatinized to obtain magnetic starch micro gel, then the magnetic starch micro gel is subjected to demulsification, washing, magnetic separation, supercritical CO2 extraction and drying to obtain the porous magnetic starch microspheres. The porous magnetic starch microsphere is round, has uniform particle size, narrow pore size distribution, large specific surface and high mechanical strength, and the porous magnetic starch has a magnetic guiding function and a flexible and strong adsorption loading function, and has wide application prospect in the fields of sewage treatment, targeted drugs, catalytic industry, environment monitoring, immobilized enzymes and the like.

The invention discloses a method for preparing a polymer gel electrolyte cell. The method comprises the following steps of: (1) polymer powder pretreatment: performing high-speed ball-milling on a polymer powder body, and thus obtaining powder with the granularity less than 1 mu m; (2) polymer powder dispersion: mixing the polymer powder which is obtained by ball-milling in the step (1) with a non-aqueous solvent, lithium salt and an additive to prepare sub-micron-sized polymer suspended dispersion liquid; and (3) electrolyte gelatinization: injecting the polymer suspended dispersion liquid which is prepared in the step (2) into a lithium ion cell for full immersion, gelatinizing at high temperature for 1 to 12 hours, and cooling to obtain the polymer gel electrolyte cell. Compared with the prior art, the polymer gel electrolyte cell prepared by using the method is high in ionic conductivity, low in battery internal resistance, long in cycle life, high in high-temperature performance, high in safety performance and free from liquid leakage risk. The polymer gel electrolyte cell is obviously superior to an electrolyte cell prepared by using a conventional preparation method in terms of comprehensive performance.

The invention relates to a double-blade swing hydraulic motor for a driving stabilizing rod. The double-blade swing hydraulic motor for the driving stabilizing rod comprises an output shaft, a cylinder body, a front end cover and a rear end cover, wherein stator blades are symmetrically arranged in the cylinder body, and rotor blades are symmetrically arranged on the output shaft; the stator blades and the cylinder body are of an integrated structure, and the rotor blades and the output shaft are of an integrated structure; oil cavity channels are formed in the two sides of each rotor blade so that oil cavities which are arranged in an opposite mode can be communicated; interior sealing devices are arranged in the middle of each stator blade and the middle of each rotor blade. Each interior sealing device comprises a leaf spring, a sealing frame and sealing sheets. The front end cover comprises oil ports, exhaust holes and a front end cover locating pin hole. Shaft sleeves, axial sealing devices, shaft step seals and dust rings are arranged in the front end cover and the rear end cover. Each axial sealing device comprises a wavy leaf spring, a conical gasket and a sealing ring. The double-blade swing hydraulic motor for the driving stabilizing rod is simple and compact in structure, small in size, light in weight and low in manufacturing cost, can ensure high-pressure sealing of the oil cavities, and can also meet the performance requirement of the driving stabilizing rod.

The invention provides an independent-grouting-opening-free reinforcing steel bar grouting connecting sleeve system and a construction method thereof. The system comprises a plurality of independent-grouting-opening-free reinforcing steel bar grouting connecting sleeves and a reinforcing steel bar grouting connecting sleeve with a grouting opening and grout outlets, or comprises a plurality of independent-grouting-opening-free reinforcing steel bar grouting connecting sleeves and a grouting pipe. The system is characterized in that only the grout outlets A are formed in the side walls of sleeve bodies. Compared with frequently-used reinforcing steel bar grouting connecting sleeves, grouting openings special for the side walls are omitted, and therefore machining cost of the sleeves is reduced, and the potential quality hazard that grout is prone to leaking from the grouting pipe and the grouting openings in the construction process is avoided. In addition, by means of the independent grouting openings, fewer grouting pipes and grout outlet pipes are distributed, the technological requirements for constructors are lowered, and construction efficiency and construction quality are effectively improved.

The invention discloses a cooling system and an air conditioning system. The cooling system comprises a heat exchange pipe (1) and a cooling circulation pipe (2) which are mutually independent, wherein a hydraulic pump (3) and a reservoir (4) are arranged on the cooling circulation pipe (2), and the heat exchange pipe (1) is partially arranged in the reservoir (4). According to the cooling system, the length and complexity of the pipes connected into a refrigerating system can be decreased and reduced, and the problem of easily-occurred refrigerant leakage is effectively overcome.

The invention provides a lithium-ion battery, comprising a shell and a pole core contained in the shell, wherein the pole core comprises a positive pole, a negative pole, and a diaphragm located between the positive pole and the negative pole; and a liquid-state electrolyte is contained in the pole core, and a gel is filled between the pole core and the shell. The invention further provides a preparation method for the lithium-ion battery, comprising the following steps of: step 1, covering a rubberized fabric on the pole core, so as to form a sealed space in the pole core; and step 2, filling the liquid-state electrolyte in the sealed space of the pole core and performing pre-charge formation at first, and then filling second solution between the shell and the pore core, and heating to initiate a polymerization reaction, so as to form a gel between the pole core and the shell; or, filling second solution between the shell and the pore core, and heating to initiate a polymerization reaction, so as to form a gel between the pole core and the shell at first, and then filling the liquid-state electrolyte in the sealed space of the pole core and performing pre-charge formation. According to the invention, a problem of the leakage of the electrolyte is overcome, and the SEI (solid electrolyte interface) film of the negative pole cannot be influenced.

A cogeneration system is provided which is capable of reliably switching a bypass damper even if a supply of electric power is shut off in an abnormal state etc. and which is unlikely to leak exhaust gas and is cost-effective even if it is increased in size. To this end, an exhaust gas path (10) for introducing exhaust gas from a gas turbine (2) into an exhaust-heat-recovery heat exchanger (8) is provided with a bypass path (11) and an inlet of the bypass path (11) is provided with a bypass damper (12) which is controlled so as to be opened and closed by an air cylinder driven by compressed air from the compressor (3).

The invention discloses a multi-measurement-point temperature sensor. The multi-measurement-point temperature sensor comprises metal armor layers, a plurality of thermo wires are arranged orderly in the metal armor layers, the multi-measurement-point temperature sensor is characterized in that the thermo wires are isolated through aluminum oxide insulating layers, the thermo wires and the metal armor layers are isolated through aluminum oxide insulating layers, the thermo wires form multiple temperature measurement points in the metal armor layers in the axial direction, further, the thermo wires comprise one positive thermo wire and the negative thermo wires of which the number is matched with that of the temperature measurement points, and the position, corresponding to one negative thermo wire, of each temperature measurement point is welded with the positive thermo wire. The multi-measurement-point temperature sensor has the advantages that an insulating filler of a thermocouple ismade from aluminum oxide, thereby being capable of overcoming the defects that an insulating material is leaked, the insulating performance is reduced, and the thermocouple detection is out of orderdue to the breakage of the armor layers; thermo wire arrangement is carried out through a mode of jointly using positive poles so that the number of the temperature measurement points can be further increased on the armor layers of the same caliber, and the structure and wiring of the thermocouple is simpler.

Provided is an external auxiliary heating frosting-proof capillary throttling integrated device. The external auxiliary heating frosting-proof integrated device is composed of a capillary throttling device and an external auxiliary heating component, so that product structure is optimized. Modification area based on an original device is small and installation and changing are easy. Only the rear half portions, namely, the portions close to the outdoor evaporation side, of thermal coated throttling capillary tubes need to be heated, so that a refrigerant energy is improved, evaporation temperature is increased and the energy efficiency ratio of products is improved. The external auxiliary heating frosting-proof capillary throttling integrated device is suitable for all the other heat pump forms such as air source heat pumps, soil source heat pumps, water source heat pumps and heat source towers, so that the heat pumps can run more efficiently in adverse low-temperature high-humidity winter and the problem that the heat pumps are easy to frost when running in the environment is solved.

The invention discloses an ultrasonic meter for shaft sinking by boring, which comprises a downhole tool subsystem, a subsystem above the shaft, a computer subsystem, a depth instrument subsystem, a winch subsystem and an oscillograph subsystem. The invention is characterized in that: a conversion transducer is provided with a constant pressure casing; liquid medium is stored in the constant pressure casing; the conversion transducer is arranged in the liquid medium; the constant pressure casing is made of nylon polyester; the characteristic of the liquid medium is coupled with the material and structure of the constant pressure casing. The invention can form a liquid medium environment in a constant state around the proximity of the transducer. No matter how deep the downhole tool in the meter is lowered under the ground, the transducer can touch the liquid medium which keeps constant all along. Accordingly, the pressure of the conversion transducer is kept constant, and is not changed with difference of the mud specific gravity and pressure of different measuring depths. In this way, the stability and the reliability are significantly improved.

The invention discloses a gate valve of a nuclear fuel transfer device. The gate valve of the nuclear fuel transfer device comprises a gate valve component and an operating rod component in detachable connection, the gate valve component comprises a valve plate, a valve rod and a valve housing of an oval cavity structure, the valve plate is of a wedge-shaped structure, a wedge-shaped groove matched with the valve plate is formed in the inner wall of the valve housing, the valve plate is slidably embedded in the wedge-shaped groove and connected onto the valve rod in a threaded manner, the valve rod is accommodated in the valve housing, and the upper end of the valve rod extends out of the valve housing and is detachably connected with the operating rod component. The valve rod is driven to rotate through the operating rod component, so that the valve plate ascends or descends along the valve rod so as to open or close a transfer passage; the valve plate and the valve housing are in wedge-type soft seal, a sealing effect is good, the problem of poor seal or water leakage is solved, and lubrication is not required; the wall thickness of the valve housing of the oval cavity structure is unequal, strength and rigidity of the valve housing are guaranteed, weight of the gate valve component is reduced, and decontamination is facilitated; the operating rod component is small in friction and operating torque of remote control, and the gate valve is simple in structure.

The invention provides a connecting pipe and a connecting pipe assembly with the connecting pipe. The connecting pipe comprises a middle pipe section, a first transition section, a first connecting pipe, a second connecting pipe, and a connecting section, wherein the first transition section is connected between the two ends of the middle pipe section, and the horizontal included angle between the pipe wall of the first transition section and the middle pipe section is alpha (alpha is greater than 0 degree and less than or equal to 90 degrees); the first connecting pipe and the second connecting pipe are respectively connected with the first transition section; the connecting section is respectively connected with the first connecting pipe and the second connecting pipe; the pipe diameter of the first connecting pipe is equal to that of the second connecting pipe but different from the pipe diameter of the middle pipe section, and the first connecting pipe and the second connecting pipe are arranged asymmetrically relative to the middle pipe section; and the middle pipe section, the first transition section, the first connecting pipe, the second connecting pipe and the connecting section are integrated. In the invention, the connecting pipe assembly comprise a reducer pipe, a third connecting pipe and a fourth connecting pipe, wherein the third connecting pipe and the fourth connecting pipe are respectively connected with the two ends of the reducer pipe, the reducer pipe is the connection pipe, and the reducer pipe, the third connecting pipe and the fourth connecting pipe are integrated.

The invention discloses a single-sided erecting-formwork oblique throwing support device adopting flower basket screws and a construction method for the single-sided erecting-formwork oblique throwingsupport device. The device comprises a side wall template, a template pressure beam, a steel tube inclined throwing support, an anti-floating reinforcement ring and flower basket screws, wherein theside wall template is arranged outside a structural side wall; the template pressure beam is arranged outside the side wall template; the upper and lower ends of the template pressure beam are fixed and riveted by a horizontal pull rod; one end of the steel tube inclined throwing support is connected with the template pressure beam for reinforcing the template pressure beam, and the other end of the template pressure beam is connected to a bottom plate; the anti-floating reinforcement ring is pre-embedded into a chamfer position at a joint of the bottom plate and the structural side wall; andthe flower basket screws are connected with the template pressure beam and the pre-embedded anti-floating reinforcement ring for vertically restraining and horizontally reinforcing again. The single-sided erecting-formwork oblique throwing support device adopts the flower basket screws to provide template anti-floating force and template prefabricating and splicing, optimizes the structural supporting form and the plate surface system of the template, overcomes quality common problems such as swelling, slurry leaking and slab staggering due to the fact that the oblique throwing support systemfloats, and guarantees perpendicularity and flatness of a wall body. The single-sided erecting-formwork oblique throwing support device is convenient in process construction, is good in economical efficiency, guarantees engineering quality, and greatly optimizes a single-sided erecting-formwork supporting system.

The invention relates to a fixing structure of a throttling capillary of an air conditioner. The fixing structure comprises the capillary which is wound into an oval pipe with orderly arrangement and two lengthened connecting pipes, the two ends of the capillary are respectively welded with the connecting pipes, the two connecting pipes and the capillary which is wound into the oval pipe are fixed together by wire clamps. Three wire clamps are utilized for fixing the connecting pipes and the capillary, wherein, two wire clamps are arranged on one side of the oval pipe with the orderly arrangement for respectively fixing welds between one connecting pipe and the other connection pipe and between the connecting pipe and the capillary; the other wire clamp is arranged on the other side of the oval pipe with the orderly arrangement for fixing the capillary.

A dynamic thermal infrared stealth composite material based on dual phase change is a VO2 / mica-based phase change thermal storage thin layer composite material composed of a VO2 nanoparticle coating and a mica-based phase change thermal storage thin layer, wherein the mica-based phase change thermal storage thin layer consists of stearic acid and a vanadium-extracted mica substrate in a mass ratio of 3-5:5-7. The composite material based on dual phase change is prepared by extracting vanadium from vanadium mica using a roasting and acid leaching process to prepare VO2 nanoparticles and a vanadium-extracted mica, embedding a phase change functional body into the vanadium-extracted mica as a support substrate to prepare a mica-based phase change thermal storage thin layer, and coating the VO2 nanoparticles on the mica-based phase change thermal storage thin layer. The dynamic thermal infrared stealth composite material can synergistically reinforce thermal infrared stealth performance.

The invention relates to a petrol station device, in particular to a barrier and explosion-proof skid-mounted device for a petrol station. The barrier and explosion-proof skid-mounted device comprises a barrier and explosion-proof petrol storage tank (2), split-type petrol filling machines (10) and control chambers (9) beside the petrol storage tank (2); the petrol storage tank (2) is a double-wall tank, and the petrol storage tank (2) is internally provided with a support (17) which is welded to a skid body (16); a cavity of the double-wall tank is internally provided with petrol-leakage-prevention units (14) and gas detecting alerters (18), and the petrol storage tank (2) is internally provided with a barrier and explosion-proof material (15) which is a column or a sphere of a honeycomb net structure and is made of a metal material; and the barrier and explosion-proof material (15) and the petrol storage tank (2) form a conductor. According to the barrier and explosion-proof skid-mounted device, the petrol storage tank is internally provided with a plurality of cabins, and petrol products of various types can be provided to meet different demands; and the device is of a skid-mounted structure and can be relocated and moved at any moment, the occupied area is small, the station building time is short, the cost is low, use and maintenance are easy and convenient, and the applicable places are wide.

The invention discloses a neutron small angle scattering loading device for studying metal surface hydrogen corrosion. The device realizes the flaky sample overlapping by using a multi-flake sample clamp; the small angle scattering signals in hydrides are increased; meanwhile, the uniform loading of the hydrogen gas is ensured; the dimension of a hydrogen loading cavity can be optimized in modes of metal welding and metal gaskets; the high-temperature and high-pressure loading of hydrogen gas is guaranteed; the interference of the hydrogen gas on the neutron small angle scattering experiment can be obviously reduced; a buffer tank and a pressure monitor matched with the hydrogen loading cavity achieve the effects of maintaining the experiments and feeding back hydrogen pressure. The devicehas the advantages that the problems of interference on experiment precision and high-temperature and high-pressure hydrogen leakage are simultaneously solved when the neutron small angle scatteringsignals of the metal surface hydrogen corrosion are effectively obtained. The device is combined with a neutron small angle scattering technology; the microstructure change of the active metal in thehydrogen corrosion process can be studied in situ; the defects of a conventional method in an aspect of the hydrogen corrosion early period microstructure analysis can be overcome.

The invention discloses a baffle plate of a flue. The baffle plate of the flue comprises a shell, a baffle plate body, a shaft, bearings, support frames, an actuator, waterproof covers, and heat dissipation fins or annular plates. The shell can be in a circular shape or in a square shape or in other shapes, the shape of the shell corresponds to the shape of the baffle plate body, the baffle plate body can be a single-shaft baffle or a multi-shaft baffle according to the shape and the size of the baffle plate body, the baffle plate body is connected with the shaft, and the shaft penetrates through a sleeve and is matched with the bearings. Bearing seats are fixed on the support frames which are fixed outside the shell, one end of the shaft is connected with the actuator, and the other end of the shaft is in axial unconstrained sliding fit with one bearing. The waterproof covers and the heat dissipation fins or the annular plates play roles of water resistance and heat dissipation for the bearings and shaft holes. The baffle plate body, the shaft and other inner parts are coated with heat insulation paint so that the baffle plate body, the shaft and other inner parts are prevented from carbonization and deformation under high-temperature conditions; and the joint bearings and / or universal joints are adopted, so that the defect that production is affected due to the fact that the baffle plate is blocked after deformation caused by installation or heat and stress is overcome, the defect that sealing is affected after a traditional structure deforms mechanically is also overcome, and the problem that leakage happens due to the mechanical deformation is solved.

The invention discloses a directly-connected oil pump for a dump truck. The directly-connected oil pump is provided with a pump body, a pump cover and a gear shaft of a transmission gear, wherein the pump cover is matched with the pump body; a spline sleeve with a spline is sleeved and connected to the input end of the gear shaft; the pump cover is prolonged to a connecting part which can be used for enclosing the gear shaft and the spline sleeve; a sealing ring between the gear shaft and the pump cover is fixed and positioned through a retainer ring; an isolation pad is arranged at a position where the gear shaft and the spline sleeve are sleeved and connected; and an oil leakage observing hole is formed between the pump cover and the gear shaft. The invention has the advantages: a gear oil pump is directly connected with a power takeoff device through the spline, so that the weight is lowered, the energy consumption is lowered, the transmission efficiency is increased, the structure is simple, and the cost is reduced effectively in comparison to the conventional transmission mode; moreover, a sealing isolation pad is arranged between the spline and the gear shaft; and meanwhile, the pump cover is provided with the oil leakage observing hole, so that the problem of leakage of the gear oil pump into a transmission case at the power takeoff end caused by the sealing problem is solved effectively.

The invention discloses a roots flowmeter, which includes a casing, as well as two roots assemblies that are subjected to relative rolling rotation, wherein each of the roots assemblies is composed of a roots and a roots shaft; the roots assemblies are supported on rolling bearings, rotate at high speed, and at the same time drive a coaxial transmission gear to rotate; the rolling bearings are fixed on an upper metering plate and a lower metering plate; the transmission gear is meshed with an optionally matched gear of a sealing coupler; external magnetic steel matched with the corresponding part of a stepped through hole of an external magnetic steel base is embedded in the external magnetic steel base; the middle part of an internal magnetic steel base is matched and mounted inside the external magnetic steel and the external magnetic steel base; a rotating shaft is mounted on the internal magnetic steel base through a rotating shaft sleeve; internal magnetic steel is mounted at the lower end part of the rotating shaft; a transmission claw is mounted at the upper end of the rotating shaft; and the transmission claw is connected with a reducing mechanism. The reducing mechanism performs certain digit-ratio conversion and transmits the result to a counter; and the sealing coupler is tightly pressed on the casing by a metal gland, and is sealed by a seal gasket. The roots flowmeter is reasonable in structural design, is convenient to mount and use, is good in fixing stability, is not easy to loose, and avoids loss of the transmission energy.

The invention relates to a four-sided valve. In the technical scheme, a valve chamber, a water inlet channel, a water outlet channel and a pressure channel are arranged in a valve body, wherein the water inlet channel, the water outlet channel and the pressure channel are communicated with the valve chamber, an upper rubber tympanic membrane, a lower rubber tympanic membrane and a piston arranged between the upper rubber tympanic membrane and the lower rubber tympanic membrane are arranged in the valve chamber, the lower rubber tympanic membrane is used for blocking the pressure channel and the valve chamber, the piston can move up and down under the action of water pressure in the pressure channel so as to selectively block the upper rubber tympanic membrane or communicate the water inlet channel and the water outlet channel and is formed by connecting an upper part and a lower part, the upper part of the piston is made of elastic material, and the lower part of the piston is made of hard material. The four-sided valve has the advantages of long service life, rapid cutting-off of water and good sealing performance.