239results about How to "Reduce positive pressure" patented technology

The present invention relates to a solution for controlling the pressure/flow of breathing gas to a mechanical ventilator (4) by using an energy of breathing analysis and further to provide a pressure relief during exhalation and a trigger determination when to start the pressure relief using energy content of breathing in analysis for determining a pressure curve form during at least a portion of the expiration phase.

The invention discloses a permanent magnet ball joint with a posture sensing function and a measuring method of the permanent magnet ball joint. The permanent magnet ball joint comprises a first permanent magnet, a second permanent magnet, a rotary shaft, a spherical shell, an upper base, a lower base and a Hall sensor. The first permanent magnet is sealed in the spherical shell. The second permanent magnet is fixedly arranged on the lower base. The Hall sensor is arranged on the second permanent magnet. A groove is formed in the lower base, and an opening of the groove faces upwards. One end of the spherical shell is embedded in the groove of the lower base. The other end of the spherical shell stretches out of the upper base to be fixedly connected with the rotary shaft. The rotary shaft drives the spherical shell to rotate relative to the upper base, the second permanent magnet and the lower base. By the adoption of the permanent magnet ball joint with the posture sensing function and the measuring method of the permanent magnet ball joint, multi-degree-of-freedom rotation of the rotary shaft is achieved, the polarization directions of the upper permanent magnet and the lower permanent magnet are opposite, part of gravity of the rotary shaft is counteracted by repulsive force, the positive pressure to a contact portion between the rotary shaft and a bearing is reduced, then the friction is reduced, the abrasion is reduced, the service life of the bearing is prolonged, and vibration and noise are reduced; a good lubricating function is achieved through magnetorheological fluid, and friction is reduced; the position of the rotary shaft can be obtained conveniently and rapidly through detection of the Hall sensor and the mapping relation.

An atmospheric pressure measuring apparatus allows a transmitter to transmit an acoustic wave for measurement of the atmospheric pressure. Air propagates the acoustic wave. A receiver receives the acoustic wave. Since the intensity of the acoustic wave changes to follow the variation of the atmospheric pressure, the atmospheric pressure can be measured based on the intensity of the acoustic wave received at the receiver. The atmospheric pressure is in this manner measured with such a simplified structure.

The invention provides a rolling bearing no-load starting torque measuring device. The device comprises a rotating motor, a bearing seat, a measured bearing, a measuring mandrel, a coupling and a sensor, wherein the rotating motor is fixed on a rack; the cylindrical outer surface of the lower end of the bearing seat is connected with an output shaft of the rotating motor; an inner hole of the bearing seat is fixed to an outer ring of the measured bearing; the bottom of the measuring mandrel is connected with the measured bearing; the measuring mandrel is matched with the inner surface of an inner ring of the mandrel bearing and is fixed through a friction force between the measuring mandrel and the measured bearing; the upper part of the measuring mandrel is connected with the spring coupling through a connecting mechanism; and the spring coupling is connected with the torque sensor. The conical measuring mandrel is simple in structure, low in machining precision requirement and low inmachining difficulty, so that the detection cost can be effectively reduced.

A carbonizing method with variable-pressure control in whole procedure for high carbonizing quality features that above the carbonizing furnace, the high-flow kerosene drip method is used to increase the positive pressure in furnace for generating high-activity high-carbon atmosphere and high furnace pressure, which can speed up the carbonizing on the surface of workpiece, and the furnace pressure can be regulated for controlling the carbonized depth, hardness and metallographic structure of workpiece.

The invention discloses a suspended type monorail transit track beam, belongs to the technical field of rail traffic and aims at providing the suspended type monorail transit track beam. By improvingthe vibration absorbing performance of the suspended type monorail transit track beam, the train running comfort is improved. The suspended type monorail transit track beam comprises a track beam topplate, track beam web plates and track beam bottom plates, wherein the track beam web plates are arranged on the left and right sides of the track beam top plate, and the track beam bottom plates arearranged on the internal side walls of the track beam web plates; vibration absorbing rubber pads are arranged on the track beam bottom plates; running rails are arranged on the vibration absorbing rubber pads; and the running rails are connected to the track beam bottom plates through fastener systems. The suspended type monorail transit track beam is applicable to the suspended type monorail transit track beams.

The invention relates to a composite vibration energy collector, which comprises a shell and a cover plate, wherein a first permanent magnet, an upper pyrolytic graphite plate, a first induction coil,a first friction layer, a second friction layer, a second permanent magnet, a third friction layer, a fourth friction layer, a second induction coil and a lower pyrolytic graphite plate are arrangedin the shell from top to bottom. One the one hand, the first friction layer and the second friction layer have relative motion to form a friction charge, and the third friction layer and the fourth friction layer have relative motion to form a friction charge, and on the other hand, when the second permanent magnet impacts a piezoelectric plate on the shell, the piezoelectric plate is deformed togenerate piezoelectric charges, and meanwhile, and the change of the surrounding magnetic field can be caused in a movement process of the second permanent magnet, so that the magnetic flux in the first induction coil and the second induction coil changes, and thus induction electromotive force is generated in the coils; and mechanical energy can be effectively converted into electric energy, vibration energy collection can be carried out by adopting a plurality of collection modes, and the energy conversion efficiency is greatly improved.

The invention relates to a hydrostatic pressure testing device for a body of an underwater wellhead for marine oil and gas production. The hydrostatic pressure testing device comprises a sealing end cap and a sealing mandrel, a step through hole is arranged on the sealing end cap, a screw hole matching with the mandrel is arranged at the upper end of the step through hole, an upper hole shoulder is arranged at the upper end of the screw hole, a locking hole matching with the periphery of the wellhead is arranged at the lower end of the step through hole, a ring slot is arranged in the locking hole, movable lock blocks are mounted in the ring slot, a lower hole shoulder is disposed at the upper end of the locking hole, the upper end of the sealing mandrel is provided with threads and is hermetically connected with the screw hole at the upper end of the sealing end cap, the periphery of the sealing mandrel matches with an inner hole of the wellhead, the periphery of the lower end of the sealing mandrel hermetically matches with the lower side of the inner hole of the wellhead, and an injection hole which is communicated with a cavity in the middle of the step through hole is arranged on the sealing end cap or the sealing mandrel. The hydrostatic pressure testing device is simple in structure, reasonable in arrangement, convenient in use and installation, high in safety and reliability and long in service life, and can be reused.

The invention provides a combined type sowing fertilizing ditcher and belongs to the technical field of agricultural machinery. The left end of a scraping plate is fixedly connected with a sowing ditcher bank in a core ploughshare type ditcher and the right end of the scraping plate is fixedly connected with a side of a connecting plate base in a notch disc ditcher, so that the core ploughshare type ditcher and the notch disc ditcher are integrally combined. The combined type sowing fertilizing ditcher can solve the problem that a hard soil layer is difficult to ditch during an inter-row sowing process; the core ploughshare type ditcher and the notch disc ditcher are used in a matching form, so that the positive pressure required by the notch disc ditcher for penetrating into the soil is reduced and the problem of difficulty in controlling the soil-penetration depth when the core ploughshare type ditcher is singly used is solved; and the combined type sowing fertilizing ditcher has excellent soil-penetration property and strong passing capacity.

The invention relates to the field of permanent-magnet linear motors, and discloses a low-resistance coreless unilateral permanent magnet synchronous linear motor that includes a linear guide rail, wherein permanent magnets are laid on the linear guide rail at intervals in the axial direction. The motor also comprises a mover seat that is in sliding fit with the linear guide rail; a first rail anda second rail are symmetrically arranged on the linear guide rail in parallel in the axial direction. A first guide groove and a second guide groove of which the groove walls are cavities are correspondingly formed in the mover seat; at least one long steel magnet is arranged on at least one axial side wall of each of the first rail and the second rail in the vertical direction; the groove bottoms of the first guide groove, the second guide groove and the long steel magnets on the same side are connected with piezoelectric ceramics; coils are arranged in adjacent groove wall cavities, and thecoils are connected with the piezoelectric ceramics through wires. The guide effect of the guide rail is reserved; when the mover seat bears load and is pressed, the positive voltage effect of piezoelectric ceramic is used for providing current for the coil, so upward lifting force is generated on the mover seat under cutting of a symmetric magnetic field of the long steel magnets, thrust fluctuation is restrained, and the robustness of an advancing system is improved.

The invention relates to an adaptive wind and sand prevention device for a wind generating set. The conventional equipment has poor wind and sand prevention capacity and a complex structure. In the device, an air filtering device consisting of a filtering net and a filter is adopted to filter external air in wind and sand environment; the filtered air is pressed into a cabin by a screw compressor; the rotation of a main shaft of a blower is transferred to the filter and the compressor through a belt pulley and gear transmission system in rational proportion, so that the filtering and boosting can be realized without additional power system; and the air pressed into the cabin ensures that the air pressure in the cabin is higher than the external atmospheric pressure, so that the wind and the sand cannot enter the cabin from a revolving pair or installation clearance of the cabin so as to realize a wind and sand prevention function.

The invention relates to a wheel-rail load-increasing device for a railway vehicle, comprising an axial suspension boom (1), a framework (2), a dual-coil spring (3), an electromagnet and the winding thereof (4) and a magnetically-insulated gasket (5), wherein the axial suspension boom (1) is welded on the top of the framework (2); the framework (2) is a frame-type structure with a hollow middle; the rewinding spring (3) is disposed at the middle of the framework (2); the electromagnet and the winding thereof (4) are disposed at the both sides of the framework (2); and the magnetically-insulated gasket (5) is disposed on the bottom of the framework. Compared with the prior art, the wheel-rail load-increasing device for a railway vehicle disclosed by the invention can improve climbing capacity and change the positive pressure on steel rail by wheel set when the vehicle runs in upward slope, downward slope and flat slope, thereby freely changing the traction of the vehicle and enabling the vehicle to be of high service life and safety.

The invention relates to a forced vibrating, air-pressure deep loosening, weeding and fertilizing machine which is characterized by comprising a machine frame, a weeding device, a forced vibrating device, a deep loosening device, a high-pressure air pump, a fertilizing device and deep control devices; the weeding device is arranged under a front beam; the forced vibrating device, the high-pressure air pump and the fertilizing device are arranged on a cross beam; the deep loosening device is arranged under a rear beam; one deep control device is arranged on each of the two sides of the cross beam. According to the forced vibrating, air-pressure deep loosening, weeding and fertilizing machine provided by the invention, firstly, a deep loosening shovel is forced to vibrate through the forced vibrating device so as to realize deep loosening operation of soil; on the other hand, high-pressure air is injected into the deep loosening shovel through the high-pressure air pump, so that soil can be broken through air pressure, and meanwhile, an air film is formed on a shovel tip and jointly plays a role of resistance reduction with the vibration. In a word, the invention provides the forced vibrating, air-pressure deep loosening, weeding and fertilizing machine which can reduce the traction resistance, reduce the energy consumption and finish weeding, deep loosening, fertilization and other operations at a time and of which parts are convenient to disassemble, and the tilling width is adjustable.

The invention provides a high speed train model wind tunnel test standard roadbed. According to the scheme, the high speed train model wind tunnel test standard roadbed comprises a fixed supporting base module, a slide supporting base module and a roadbed edge module. The fixed supporting base module, the slide supporting base module and the roadbed edge module are provided with mutually matched slide rails. The fixed supporting base module is fixedly provided with a supporting base. The slide supporting base module is provided with a slide table. The slide table is arranged on a guide rail and can freely slide along the guide rail. The slide table is fixedly provided with the supporting base. The fixed supporting base module, the slide supporting base module and the roadbed edge module can mutually and freely docked. According to the scheme, segmented and modular design of the roadbed is adopted, and the slide rails are arranged and the space between the supporting bases can be adjusted so that pneumatic testing of different length of train models under the same roadbed can be met, the error of the pneumatic influence caused by different roadbeds can be eliminated and the problemof the influence of different roadbed outline structures on the test data can be effectively solved.

A rail clamping device used for a caterpillar band engineering machine comprises a left rail clamp (4) and a right rail clamp (8), the left rail clamp (4) and the right rail clamp (8) respectively comprises an upper plate, a side plate and a lower plate, each upper plate (8-0), the corresponding side plate (8-3) and the corresponding lower plate are fixedly connected or formed in an integrated mode to be of a semi-I-shaped structure, each side plate is perpendicular to the corresponding upper plate, a pair of pull rod holes are formed in a spaced mode in the length direction of the side plates, and a reinforcing rib plate is perpendicular to the side plates and arranged near the pull rod holes; a pull rod (7) penetrates through the side plate of the left rail clamp (4) and the side plate of the right rail clamp (8) and is fastened, the pull rod is sleeved with a spacer bush (6), and the spacer bush (6) is located between the side plate of the left rail clamp and the side plate of the right rail clamp; the included angle between the lower surface of the lower plate and the upper surface of the upper plate of the left rail clamp is minus 2 degrees-minus 15 degrees, and an axial limit plate is fixedly connected to the position, opposite to a caterpillar wheel of the engineering machine, of the lower end of the outer surface of each side plate. The rail clamping device is simple in structure and convenient to repair.

The invention relates to an automatic control device and control method for converting contact force into displacement during electric spark deposition bead weld. The automatic control device mainly comprises a feeding mechanism, a floating elastic mechanism, a gun clamping mechanism, a welding gun, an electric control system and the like and converts the contact force between an electrode and a workpiece into displacement of a floating sliding table. A non-contact displacement sensor is adopted for detection, conversion from tension and pressure measurement to displacement measurement is achieved, the strength of a mechanical system is improved, and measurement of micro contact force can be achieved. The contact force between the electrode and the workpiece is determined according to the displacement of the floating sliding table, a controller and the feeding mechanism are used for controlling the electrode to move along the axis of the electrode, closed-loop control over the contact force is achieved, and vibration between the electrode and the workpiece can be reduced through spring damping of the floating elastic mechanism; and the stability and reliability of automatic control of the contact force between the electrode and the workpiece in the deposition process are remarkably improved.

The invention relates to a square hole punch chip used on a punch press. The square hole punch chip used on the punch press comprises a punch chip body of which the cross section is square, the end of the punch chip body is provided with a guide head of which the orthographic protection is trapezoidal, the upper portion of the guide head is narrow, the lower portion of the guide head is wide, the cross section of the guide head is square, the transition face of the guide head and the punch chip body is a slope, and the inclination angle of the transition face is smaller than the base angle of the guide head. According to the square hole punch chip used on the punch press, the expansive force of outward deformation of products is increased through the guide head, and consequently positive pressure on the punch chip body from the products is decreased; the contact face of the punch chip body and the products is enlarged through the inclined transition face, impact force between the punch chip body and the products is reduced, and consequently the square hole punch chip is more resistant to abrasion and longer in service life, and the stamping effect of a square hole is ensured.

The invention relates to an efficient orange cleaning device. The device comprises a cleaning box body, wherein a conveying assembly which is used for conveying oranges is arranged at the bottom of the cleaning box body, one end of the conveying assembly is provided with a raw material feeding port, one end of the conveying assembly, far away from the raw material feeding port, is provided with adischarging port, and a cleaning rolling brush is arranged above the conveying assembly side by side; the conveying assembly comprises a horizontally arranged annular rotating belt, the annular rotating belt circularly rotates in the horizontal direction, a plurality of horizontally arranged placing rollers are rotatably connected on the annular rotating belt, the placing rollers are taken as driving rollers, space for placing products is formed between two placing rollers, the top of the cleaning water box is also provided with a water spraying assembly; the invention has the technical effects that all surfaces of the oranges can be cleaned quickly, the cleanliness of oranges during eating is improved, and the food safety for people is improved.

The invention discloses a tapered roller screw rod pair and a seal structure. The seal structure is used for seal of the tapered roller screw rod pair, the nut end portions or the nut assembly end portions of the tapered roller screw rod pair are provided with connection heads, seal assemblies which are in one-to-one correspondence with the connection heads and are correspondingly and fixedly connected with the connection heads are provided, the inner surfaces of the seal assemblies are provided with seal screw threads, the seal screw threads are tightly screwed with a screw rod of the taperedroller screw rod pair to form a contact type seal sliding pair, wherein a nut assembly means an assembly formed by pairing use of two nuts. According to the seal structure, the tapered roller screw rod pair and the seal structure are relatively good in reliability.

A measuring mechanism of flow rate consists of measuring cavity with water outlet at its top, vane wheel in the cavity and a numbers of flow guide holes for guiding water flow to vanewheel. It is featured as setting all flow guide holes at bottom of measuring cavity in annular form uniformly by utilizing vane wheel shaft of a centre, setting a non-return by utilizing vane wheel shaft as a centre, setting a non-return disc on water inlet top cover of water collector and setting one or four small flow guide hole niterlinked to small water collector being isolated to said water collector at side wall of measuring cavity.

The invention relates to an inhalator (1) for powdery substances (33), especially medical substances. Said inhalator comprises a substance reservoir chamber (27) and a metering chamber (34). Said metering chamber is configured as a crossbore (35) of a rod (36) and can be displaced from a filling position (B) to a discharge position (E), in which discharge position (E) the metering chamber (34) is positioned in an air flow channel (21). The aim of the invention is to improve said inhalator, especially with regard to the filling or emptying of its metering chamber, even when particles of smallest dust-like grain size are used. For this purpose, at least a part of the reservoir chamber wall (28) is displaced in the direction of the rod (36) when the inhalator (1) is actuated.

The invention relates to the field of child safety seats, in particular to a child safety seat with a footrest component. Springs for damping are added in a base, a backrest, a headrest and the like of the child safety seat so as to facilitate cushioning and energy absorption during collision, and bodily injury to children due to collision is reduced. Meanwhile, an FIX unlocking component, the footrest component and a safety belt component of the seat are optimized to supply practicability; an anti-splashing component is added to avoid injury to children due to splashing materials during collision.