125results about How to "Change the cross-sectional area" patented technology

The Coriolis mass flow meter of this invention comprises two parallel curved flow tubes 1 and 2, a drive unit 15, and a pair of vibration sensors 16 and 17. An inlet-side manifold 24 dividing the flow of a fluid being measured into the two flow tubes 1 and 2 from the inlet thereof, and an outlet-side manifold 25 joining the fluid flows flowing in the two flow tubes 1 and 2 to discharge from the fluid outlet thereof are mechanically connected to a meter body 30 only at the inlet side of the inlet-side manifold 24 and at the outlet side of the outlet-side manifold 25, respectively. With this arrangement, the effects of vibration transmitted from the meter body 30 and all structures connected thereto can be reduced at the joint parts between the inlet-side and outlet-side manifolds 24 and 25 that serve as vibration fulcrums.

The invention discloses a double-layer channel variable-section turbine control device, belonging to the field of an internal combustion engine. The double-layer channel variable-section turbine control device comprises a turbine housing, wherein the turbine housing is internally provided with a gas inlet inner channel and a gas inlet outer channel; the gas inlet outer channel is positioned at the outer side of the circumferential direction of the gas inlet inner channel; and a partition wall is arranged between the gas inlet outer channel and the gas inlet inner channel. The double-layer channel variable-section turbine control device is characterized in that the gas inlet inner channel is provided with a gas inlet; the position on the partition wall, close to the gas inlet, is provided with an outer channel gas inlet which is provided with a gas inlet control device; the double-layer channel variable-section turbine control device can effectively guarantee that the double-layer channel variable-section turbine meets the supercharging needs of the all condition range of the engine, simultaneously has no existence of potential unreliability of rotary vane type and axial movement type variable-section turbine supercharger and has simple and reliable products.

The invention discloses a nozzle, an ejector based on the nozzle and having an adjustable flow characteristic, and application of the ejector. The nozzle comprises a nozzle body, a small nozzle, a large nozzle and an elastic part; a thin and long hollow pipe with a valve is adopted as the small nozzle, and the elastic part is arranged between the set of large nozzle and the set of small nozzle; one end of the elastic part jacks the valve part of the small nozzle, and the other end of the elastic part jacks the large nozzle; and the elastic part can change the position of the valve of the smallnozzle under the effect of to-be-ejected gas, and then a flowing path of the to-be-ejected gas is controlled. The supply quantities of hydrogen and recycled hydrogen are automatically controlled by the nozzle according to system loads; when the low load exists, the small nozzle acts, the pressure of a nozzle outlet is small, the recovery rate of the recycled hydrogen is high, and the hydrogen utilization rate is increased; when the medium-high loads exist, the two sets of nozzles act simultaneously, and the large nozzle is used for enlarging the circulating area to provide the larger fuel flow; and the small nozzle is used for increasing the ejecting speed to improve properties of the ejector.

The invention discloses a flow field precise control system for a DC transient impact type transonic wind tunnel and a control method, which belong to the technical field of wind tunnel tests, and aimat the problem that existing equipment fails and cannot be braked in time. The flow field precise control system comprises a control center computer, an attack angle control computer, a gate finger controller, a flow field controller, gate finger driving equipment and a pressure regulating valve electro-hydraulic system, wherein the gate finger driving equipment comprises a gate finger device, the grid finger device comprises two groups of gate finger sections arranged at upper and lower wall plates of a second throat of a wind tunnel super-expansion section, each group of gate finger sections comprises six wing-shaped gate finger pieces, each group of gate finger sections are respectively fixed on upper and lower gate finger trolleys, each gate finger trolley is provided with four columns of linear guide rails, and a servo electric cylinder is provided with a linear displacement sensor. Therefore, the purpose of precisely controlling a Mach number of the flow field of the DC transient impact type transonic wind tunnel is achieved; and the control method solves the problem of Mach number control precision within a range that M is greater than or equal to 1.0 and less than or equalto 1.2 by adopting a control mode integrating PID control and feedforward control for the gate fingers and performing optimized control over the flow field.

Provided is a low-cost expansion device capable of changing the passage cross-sectional area of ​​the throttling passage according to the pressure and temperature of the introduced refrigerant without providing a high-pressure closed space. The expansion device includes: a differential pressure valve for having its valve lift controlled according to a pressure difference across the expansion device; and a temperature sensing portion for further controlling the pressure difference according to refrigerant temperature The valve lift of the valve. The differential pressure valve includes a piston having a larger outer diameter than the valve element and integrally formed with the valve element. The piston forms a pressure regulating chamber into which the inlet pressure of the refrigerant is introduced through the pressure channel, so that when the inlet pressure of the refrigerant becomes higher, the differential pressure valve is operated in the valve opening direction. The temperature sensing part is formed by filling wax having a large bulk expansion coefficient into a bellows that can expand and contract axially, thereby operating the differential pressure valve in a valve-closing direction when the refrigerant inlet temperature becomes high.

A cam type infusion regulator consists of a shell 1, a supporting wheel 2 and a regulating wheel 3. The shell has a structure of a U-shaped groove, two pairs of axle holes (1a, 1c) are correspondingly drilled on the upper side and the lower side, and axial lines of the two pairs of the axle holes (1a, 1c) are parallel with each other and perpendicular with each other; the supporting wheel 2 is arranged in the axle hole 1c on the lower part of the shell; the regulating wheel 3 is arranged in the axle hole 1a on the upper part of the shell; the surface 3c of the regulating wheel has a cam shape, the distance between the surface 3c of the regulating wheel and an axle center changes in an involute mode, and the curvature change of the surface 3c of the regulating wheel meets the regulating and control requirements on the infusion speed; an infusion conduit is arranged between the regulating wheel 3 and the shell 1 and the supporting wheel 2; and during use, fingers twist the regulating wheel 3, the change of the distance between a curved surface 3c of the regulating wheel and a supporting wheel 3 on the bottom of the shell extrudes or releases the conduit, and changes the sectional area of the conduit to achieve the aim of regulating and controlling the infusion speed. Compared with the prior infusion regulator, the cam type infusion regulator has the characteristics of small size, material conservation, capability of self-assembly, improvement on the efficiency, convenient use, reliable regulation and stable speed.

The invention relates to an electronic control variable-damping rotation hydraulic damper which comprises a motor, an outer shell, a blade, a valve element, a valve body, a shaft, a spring, a cover plate and the like. Due to the fact that a guide groove is formed in the middle shaft of the variable-damping rotation hydraulic damper, a guide rail is arranged on the shell, the blade automatically moves transversely in the radial direction along with the guide rail during rotation, the volume of driven liquid is changed, the liquid flows in a circulated manner through the valve element, and the function that the rotation angle of the damper is unlimited is achieved; and the valve element is driven by a step motor to rotate, so that the size of the drift diameter of a runner composed of the valve element and the valve body is variable, and the function of being adjustable in rotation damping is achieved.

The present invention aims to provide a water faucet which allows a large space to be secured above the washing area and yet can deliver a high washing performance by landing streams or waterdrops having a large cross-sectional area evenly on a piece to wash. This water faucet includes a flow velocity changing part which changes the flow velocity of the stream discharged from each of multiple water spray holes such that the cross-sectional area of the stream changes with time. The multiple water spray holes are disposed at intervals such that, when the cross-sectional area of one stream discharged from one water spray hole exceeds a predetermined size, the one stream is merged with one of the other streams discharged from the multiple other water spray holes adjacent to the one water spray hole, and such that the one of the other streams with which the one stream merges changes with time.

The invention provides a microwave irradiation chamber, a microwave irradiation system and a microwave irradiation and real-time observation method. The microwave irradiation chamber comprises a shell and a shielding component, wherein a cuboid-shaped cavity is formed in the shell, a microwave receiving interface and a microwave absorption interface are arranged in the central positions of the two end walls of the shell, respectively, a first opening is formed in the central position of the top wall of the shell, and a second opening is formed in the central position of the bottom wall; the shielding component covers the first opening of the shell, and the center of the shielding component is provided with a through hole. According to the technical scheme of the invention, the microwave irradiation chamber can be directly connected into a real-time observation and analysis instrument to carry out biological index observation in real time, so that the microwave leakage is slight, and the cross-sectional area of the microwave irradiation chamber is adjustable, and therefore, the compound irradiation of microwaves with different frequencies can be realized.

The invention relates to a turbocharger and a working method thereof. The turbocharger comprises a volute arranged in a turbine casing body and a jet nozzle ring assembly which is fixed in the volute and sleeve on the periphery of an impeller of a turbine; the jet nozzle ring assembly comprises a jet nozzle ring, a plurality of long jet-nozzle blades distributed on the outer side face of the jet nozzle ring, a chute arranged between every two adjacent long jet-nozzle blades, short movable blades arranged in the chutes, linked rings concentrically arranged at the inner side surface of the jet nozzle ring, chute holes which are distributed on the linked rings and correspond to the corresponding chutes, a plurality of arc-shaped guide grooves which are distributed on the linked rings and are arranged concentrically to the linked rings, and a straight bolt arranged on the inner side surface of the jet nozzle ring; and a crank in transmission connection with a driving mechanism is arranged on an intermediate shell of the turbine and is connected with a pin hole in the linked rings through a crank shifting fork so as to drive the linked rings to rotate along a center and make the short movable blades displace in a linear reciprocating manner along a jet-nozzle airflow direction, and thus, the cross section of a jet nozzle is further controlled.

The invention relates to the technical field of space propulsion, in particular to a liquid oxygen kerosene pintle injector. The liquid oxygen kerosene pintle injector comprises a shell, an adjusting cylinder and a center rod. The center rod sleeves outside the adjusting cylinder, a first liquid spraying outlet is formed between the adjusting cylinder and the center rod, and kerosene flows through the first liquid spraying outlet to enter a combustion chamber; the shell sleeves outside the adjusting cylinder, a second liquid spraying outlet is formed between the shell and the adjusting cylinder, and liquid oxygen flows through the second liquid spraying outlet to enter the combustion chamber; and the center rod is connected with the shell, and the adjusting cylinder can move in the axial direction relative to the center rod and the shell so that the sectional area of the first liquid spraying outlet and the sectional area of the second liquid spraying outlet can be synchronously changed. According to the liquid oxygen kerosene pintle injector, when the adjusting cylinder moves, the sectional area of the first liquid spraying outlet and the sectional area of the second liquid spraying outlet are synchronously changed, and the momentum of sprayed kerosene and the momentum of sprayed liquid oxygen can be synchronously changed, so that the momentum ratio can be always kept in the optimal state in the thrust changing period, and the injection performance is improved.

The invention relates to a blast protection mixed flow blower for a ship. The blower comprises an air inlet, an axial flow motor, a centrifugal impeller, an inner barrel, an outer barrel, a back-positioned guide vane and an air outlet, wherein the centrifugal impeller is mounted to a motor shaft of the axial flow motor; the axial flow motor is mounted into the inner barrel; the inner barrel and the outer barrel are coupled via the back-positioned guide vane; the air inlet and the centrifugal impeller are cooperatively mounted to one end of the outer barrel; and the air outlet is mounted to the other end of the outer barrel. Through combining the air supply structures of traditional axial flow blower and centrifugal blower, the blast protection mixed flow blower for the ship meets the air quantity and air pressure requirements of the centrifugal blower, and possesses the advantage of installation flexibility of the axial flow blower, and is suitable to be used in ship equipment with high requirement.

The invention discloses a friction-type stud shearing-force connection part and a construction method thereof. The friction-type stud shearing-force connection part includes a stud shearing-force connection part main body, a mounting nut, a sleeve, a fixing nut and a semiconductor spring; the stud shearing-force connection part main body comprises a thread section, a thread-free extrusion sectionand a pulling-resistant pier in sequence from bottom to top; during factory prefabrication, the stud shearing-force connection part main body is sleeved with the fixing nut, the sleeve and the semiconductor spring from the thread section in sequence, the upper end face of the fixing nut is located at the top of the thread section and is fixed, the upper end of the sleeve is fixed to the lower endface of the fixing nut, the upper end of the semiconductor spring and the lower end of the sleeve are connected into one, and the shearing-force connection parts are mounted on a maim beam at intervals according to needed shearing resistant requirements. By the adoption of the friction-type stud shearing-force connection part and the construction method thereof, force transferring modes of traditional shearing force connection parts are improved, interface friction is reasonably utilized, the pretension force of the friction-type stud shearing-force connection part can be monitored and controlled, and the design philosophy of combining resistance and releasement can be achieved. The factory prefabrication degree is high, bolt splicing is conducted on the spot, and the labor cost is saved.

The invention discloses a water inlet valve which comprises a valve. A water inlet and a water outlet are formed in the valve, a throttle channel is arranged in the valve, the water inlet and the water outlet can be communicated with each other via the throttle channel, and elastic elements for correspondingly adjusting the opening of the throttle channel along with pressure change of water flow at the water inlet are arranged at the throttle channel. The invention further discloses a washing machine with the water inlet valve. The water inlet valve and the washing machine have the advantagesthat the quantity of inlet water in water accommodating buckets of the washing machine can be controlled and regulated; the magnitude of the opening of the throttle channel can be adjusted by the aidof pressure difference of the water flow at the water inlet and water flow at the water outlet, accordingly, the water inlet valve and the washing machine have constant quantity of outlet water in a unit under total water pressures, water consumption of the washing machine can be reduced, and the washing efficiency can be enhanced.

The invention discloses a shape-adaptive magnetic control self-sensing flexible pipeline and a preparation method thereof. The shape-adaptive magnetic control self-sensing flexible pipeline comprisesa hollow cylindrical flow field pipeline, a plurality of turns of coils, a plurality of anisotropic magnetic sensitive elastomers and a piezoelectric film sensor, the plurality of anisotropic magneticsensitive elastomers are arranged on the cross section of the flow field pipeline in a central symmetry manner, the plurality of turns of coils are arranged on the outer surface of the correspondingposition of the flow field pipeline, and the piezoelectric film sensor attached to the anisotropic magnetic sensitive elastomers senses the deformation of the magnetic sensitive elastomers to achieveself-sensing of the flexible pipeline. The pipeline is simple in structure, low in material cost and diverse in function. The sizes of the anisotropic magnetic sensitive elastomers and the piezoelectric film sensor are easy to control, so that the flow field pipeline has excellent shape adaptability. The off-surface deformation of the anisotropic magnetic sensitive elastomers is changed by adjusting a magnetic field generated in the pipeline after the plurality of turns of coils are electrified, so that the cross sectional area of the pipeline is changed. The deformation degree of the anisotropic magnetic sensitive elastomers is obtained through the piezoelectric film sensor, and self-sensing is achieved.

The invention relates to a diffuser structure, and discloses an adjustable diffuser. The adjustable diffuser comprises a static diffuser, a dynamic diffuser and a dynamic diffuser fixing device. A guide rod sequentially penetrates a mounting hole arranged on the dynamic diffuser fixing device and a through hole arranged on the dynamic diffuser. A locking device is matched with the guide rod to fix the dynamic diffuser and the dynamic diffuser fixing device together. The guide rod can move along the depth direction of the mounting hole and the through hole, so that the distance between the dynamic diffuser and the static diffuser is adjusted. Air exhausted by an impeller is sent in the position between the static diffuser and the dynamic diffuser. According to the adjustable diffuser, the guide rod drives the dynamic diffuser to move so that the distance between the dynamic diffuser and the static diffuser can be adjusted, the sectional area between the dynamic diffuser and the static diffuser can be changed, the surge phenomenon caused by the backflow of fluid in a flow channel under the low-load condition can be effectively improved, the operation range of a compressor can be widened, and the working energy efficiency of the compressor can be improved.

The invention discloses a method for measuring the pressure of an installation interface of a cable central connector based on a piezoresistive film, and the method comprises the steps: (1), selectinga plurality of sections from a cable central connector structure, and selecting a placement point for a piezoresistive film sensor on each section; (2), determining the position of a lead wire, wherein the direction of the lead wire is a cable direction, and is parallel to the axial direction of a sensor, and marking the sensor placement point and the lead wire; (3), grinding of the section of the sensor placement point; (4), digging a trench along a drawn line; (5), enabling the sensor to be connected with the lead wire, pasting the sensor, and coating the sensor with a silicone grease layerafter pasting; (6), placing the lead wire along the trench, and connecting the lead wire to a signal amplifier; (7), carrying out the filling of a part, which is not filled, of the trench; (8), wiping the insulating surface of a cable, and starting the measurement after wiping. The method can be used for the actual measurement of the pressure of the installation interface of the cable central connector on the basis of an actual cable structure.

Disclosed are a closed mechanical-seal pump ring and a shaft-seal flushing system with the same. The pump ring is provided with an annular left pump ring side plate and an annular right pump ring side plate which are parallel to each other, inner circumferences of the left pump ring side plate and the right pump ring side plate sleeve the outer circumferential surface of a shaft sleeve of a centrifugal pump, the outer circumferential edges of the left pump ring side plate and the right pump ring side plate are connected with a sealing gland of the centrifugal pump at an interval, a plurality of blades in rotatable and radial arrangement are arranged between the left pump ring side plate and the right pump ring side plate and are perpendicular to the left pump ring side plate and the right pump ring side plate, an end opening formed by closing ends of the radial blades corresponds to a liquid outlet of the shaft sleeve, and an end opening formed by edges of radial ends of the radial blades corresponds to a liquid inlet of a liquid outlet passage formed on the sealing gland. The closed mechanical-seal pump ring has the advantages that liquid accelerating distance is increased, and idle work is reduced; most liquid in a seal cavity can be enabled to flow, and a fluid flowing path can be lengthened to widen the flow area.

The invention discloses an adjustable ejector, and belongs to the field of ejectors. The adjustable ejector is characterized in that a mixed diffuser is connected with internal threads at the front end of a low-pressure three-way pipe fitting through external threads at the rear end of the mixed diffuser, the front end of the mixed diffuser is connected with a metal braided hose through a movablejoint, and axial displacement of the mixed diffuser relative to the low-pressure three-way pipe fitting can be achieved by rotating the mixed diffuser, so that the axial distance (i.e. nozzle distance) of the outlet cross section of a nozzle to the inlet cross section of the mixed diffuser is changed; and meanwhile, a nozzle adjusting cone is arranged in the nozzle, and the circulation cross-sectional area of a nozzle throat can be changed by changing the axial position of the nozzle adjusting cone, so that the cross section ratio is adjusted. According to the adjustable ejector, on the premise of effectively avoiding mutual influence of double adjustment variables, independent adjustment of the nozzle distance and the cross section ratio of the ejector is achieved.

The invention relates to an air conditioning and ventilation device for an energy storage container. The air conditioning and ventilation device comprises a ventilation air duct which is fixed to theinner side wall of a container shell and is located above a battery pack, wherein the ventilation air duct comprises an air inlet and an air hose connected to the air inlet; the cross-sectional area of the air hose is gradually decreased from the position of the air inlet to the position far away from the air inlet; air outlets are formed in the bottom of the air hose; and downward guide plates are arranged on the air outlet. The cross-sectional area of ventilation is changed, and the cross-sectional areas of parts away from the air inlet are sequentially reduced, so that the air resistance isincreased, the flow direction of air is forcibly changed, and the quantity of air passing through each air outlet is kept uniform to the greatest extent.