69results about How to "Guaranteed work pressure" patented technology

The invention discloses a refrigeration system and a control method thereof. The refrigeration system comprises a compressor, a condenser, a throttle device and an evaporator which are connected end to end in sequence to form a loop, a bypass loop and a control valve group, wherein a first end of the bypass loop is connected between an exhaust port of the compressor, and the condenser, and a second end of the bypass loop is connected between the throttle device and the evaporator; and the control valve group is used for controlling exhaust gas of the compressor to selectively flow through one of the bypass loop and the condenser. The refrigeration system disclosed by the invention can be preheated through the arranged bypass loop to normally start, and the exhaust gas of the compressor can be controlled to selectively flow through one of the bypass loop and the condenser through the control valve group according to an external environment temperature, thus the refrigeration system is enabled to start in a low-temperature environment, and run stably and reliably.

The invention relates to a hydraulic hose performance test experiment table mainly comprising an electric control system, an impact load system, a bending driving system of a hose to be tested, and anenvironmental simulator which are connected mutually, wherein the impact load system mainly comprises a hydraulic oil pump I, an unloading spillover valve, an accumulator, a two-position four-way magnet valve, a throttle , a pressure booster, a stop valve, a counterbalance valve, an oil return filter I, a pressure gauge, a pressure sensor, an oil tank, a connection oil pipe, a joint, and the like; the bending driving system of a hose to be tested mainly comprises a hydraulic oil pump II, a safety valve, an oil return filter II, a three-position four-way magnet valve, a hydraulic oil cylinder,a connection oil pipe, a joint, and the like; and the environmental simulator mainly comprises an environmental chamber body and an electric heater, an ultraviolet emitter and a bending degree controller of a hose to be tested, which are arranged in the environmental chamber body. The experiment table can test a plurality of hoses simultaneously, test the experimental pressure wave shape of the hoses to be tested on line and estimate the fatigue lifetime of the hoses to be tested; and the invention has simple structure, easy operation, little energy consumption and high reliability.

The invention discloses a plunger pump, which comprises a pump shell, a rear cover, an oil outlet, an oil inlet and an axial hydraulic plunger machine. The hydraulic plunger machine comprises a transmission shaft and a cylinder axially sleeved on the transmission shaft; one side of the cylinder is provided with nine cylinder holes; a plunger-skid shoe assembly is arranged in each cylinder hole; aswing component is movably pivoted to one side, exposed out of the cylinder hole, of the plunger-skid shoe assembly, and an oil distribution disc is fixedly arranged on the other side of the cylinder;the rear cover is parallel to the transmission shaft, and a small-displacement regulating device and a large-displacement regulating device are arranged on the rear cover and the transmission shaft symmetrically in equal distance; the small-displacement regulating device and the large-displacement regulating device penetrate the rear cover into the pump shell to be separately connected with the end margin of a swing component and flexibly adjust an included angle between the swing component and the transmission shaft through a control cylinder component; and the rear cover is also provided with an electric-hydraulic valve electrically connected with the large-displacement regulating device and a safety pressure valve. Therefore, the plunger pump has the characteristics of small vibration,stable pressure, energy saving, improvement on production efficiency, low cost and long service life.

The invention discloses a groove clamping hoop type pipeline joint in the technical field of pipe joints. When used for connecting pipe fittings, the groove clamping hoop type pipeline joint has the advantages of quickness, simplicity and convenience, reliability, safety, economy, vibration isolation, no pollution and convenient maintenance. The groove clamping hoop type pipeline joint comprises two semicircle arciform clamping hoops, and two ends of each semicircle arciform clamping hoop are provided with a fastening bolt connecting lug protruding outwards respectively; the lower edges along the two lateral faces of the semicircle arciform clamping hoops are provided with flanges extending downwards respectively; a groove is arranged between the two flanges, and the two semicircle arciform clamping hoops are jogged with each other to form a seal washer mounting groove; a seal washer can be mounted in the seal washer mounting groove in a matching mode; and two fastening pieces are used for fastening tightly the lugs of the two semicircle arciform clamping hoops.

The invention provides a method for treating seed precipitated aluminum hydroxide size. The method comprises the following steps: pumping seed precipitated aluminum hydroxide size into a hydrocyclone by utilizing a submersible variable-speed pump in the process of producing alumina by a Bayer process; performing stage treatment on the seed precipitated aluminum hydroxide size by utilizing the hydrocyclone to obtain overflow aluminum hydroxide size and underflow aluminum hydroxide size; introducing the underflow aluminum size into a size tank for temporary storage; introducing the underflow aluminum hydroxide in the size tank into a flat-plate type filter for filtering and washing treatment to obtain mother liquor, flat-plate washing liquor and aluminum hydroxide; and roasting the aluminum hydroxide to obtain aluminum oxide, wherein the flat-plate washing liquor is returned to the submersible variable-speed pump and/or returned and mixed with the underflow aluminum hydroxide size. By adopting the method, the classification effect can be effectively improved, the product quality can be improved, vapor consumption and electricity consumption of Bayer process produced aluminum oxide can be reduced, and cost can be reduced.

The invention discloses a centerless fixture for a cylindrical grinding machine. The centerless fixture comprises a driving wheel, a supporting wheel and a pressing wheel, wherein the driving wheel is arranged on a rotating shaft of a grinding machine; the supporting wheel is arranged at the slanting lower part of the rear side of the driving wheel; the outer side of a support of the supporting wheel is hinged to one end of a pressing rod; the pressing wheel is arranged at the middle of the pressing rod; the other end of the pressing rod is connected with one end of a spring; the other end of the spring is connected onto a grinding machine rack; a positioning part is arranged at one end face side, which is away from a grinding wheel of the grinding machine, of the supporting wheel, on the support of the supporting wheel; a punch rod clamped among the driving wheel, the supporting wheel and the pressing wheel can be axially positioned by the positioning part; the punch rod is fixed by line contact matching between the circumferential surfaces of the driving wheel, the supporting wheel and the pressing wheel and the circumferential surface of a punch body of the punch rod; after the punch rod is fixed, the axiality of the punch rod can be directly guaranteed; the acting pressure of the pressing wheel on the punch rod is guaranteed by the pretightening force of the spring; the driving wheel is driven by the rotating shaft to rotate and drives the punch rod to rotate; the grinding processing is realized by contacting a circumferential section of the upper end to be ground of the punch rod with the grinding wheel.

The invention discloses an indirect heat exchange type supercritical water oxidization system and a control method. The system mainly comprises a main supercritical water oxidization reaction flow and an intermediate medium loop. The control method comprises two-flow pressure and temperature increasing control, temperature and pressure reduction control and normal running control. The invention aims at an automatic control strategy for engineering practices of the indirect heat exchange type supercritical water oxidization system, and the concept of cyclic heating is adopted for a temperature increasing process of the system, so that investment in heating equipment is effectively reduced; mismatch between working pressure of two flows is avoided, and effectiveness of heat exchange between supercritical pressure fluids in an inner pipe and an outer pipe of a preheater/heat exchanger of a temperature increasing or temperature reduction stage of the system is ensured; process effects and system safety are ensured by effective control over reaction temperature and over-temperature protection over key equipment.

The invention discloses a piston ring for an optical controlled engine, which comprises an outer ring which is made of graphite and an inner ring with elasticity, wherein the inner circumferential surface of the outer ring is provided with an arc groove, the inner ring is provided with an internal ring opening, and the inner ring is arranged inside the arc groove. The piston ring for the optical controlled engine consists of the outer ring and the inner ring, the inner side of the graphite outer ring is provided with the arc groove, and the outer ring is attached onto the inner ring through the groove, so the leak tightness of the piston ring is greatly improved, and the work pressure of the combustion chamber is effectively ensured. At the same time, the graphite has self-lubrication effect and good heat conduction, so the lubrication between the piston ring and a transparent cylinder sleeve is ensured, and the temperature of the transparent cylinder sleeve caused by the friction can be reduced.

The invention discloses a two-position four-way rotary reversing valve. The two-position four-way rotary reversing valve comprises a valve body, a valve element arranged in the valve body, a valve cover for fixing the valve element in the valve body, and a pressing spring; the valve body includes a baseplate, and a valve element mounting cylinder projected from a mounting surface of the baseplate to be far from the mounting surface; four oil ports P, T, A and B are formed in the baseplate; a large end of the valve element is inserted in the valve element mounting cylinder, and a small end is exposed out of the valve element mounting cylinder; a blocking convex block is arranged on the large end surface of the valve element; the outer diameter of the middle section of the valve element is smaller than the outer diameter of the large end thereof for annularly coating the pressing spring on the middle section; a limiting convex block is outwards projected on the outer wall of the small end of the valve element; the valve cover covers the valve element mounting cylinder for axially fixing the valve element in the valve element mounting cylinder; the valve cover is provided with a through hole for penetrating through the small end of the valve element; and the inner wall of the through hole is outwards projected with an arc limiting space corresponding to the limiting convex block.

The present invention relates to a tyre inflation unit of tyre street roller. It includes valve body and valve stem and piston which are mounted in the interior of valve body, the piston is positioned in the upper end of valve stem. The described piston can be used for dividing upper portion of internal cavity of valve body into pressure accumulating cavity and elastic force cavity. Two ends of said valve body are equipped with an upper end cover and a lower end cover, and said valve body has a valve body air guide channel, one end of said valve body air guide channel is communicated with air inlet set on the valve body, and its another end is communicated with pressure accumulating cavity by means of end cover air guide channel set on the upper end cover, the lower end of the valve stem is extended to air outlet set on the lower end cover.

The invention relates to an improved straightening machine, comprising a base, a sliding platform, a lower template, an upper template and a hydraulic oil cylinder; the base is provided with a pair of guide rails; the sliding platform is embedded between the guide rails; the upper part of the sliding platform is provided with the lower template; the lower template is provided with a cam shaft contacted with the upper template; the upper template is fixedly arranged on the beam of a gantry frame; the gantry frame is fixed on the base; the sliding platform is connected with the hydraulic oil cylinder by using a central shaft fixedly arranged at one end of the base; the hydraulic oil cylinder is connected with an oil tank by using a pipeline; the outlet of the oil tank is connected with the inlet of the oil tank; the oil return port of an oil path is connected with the inlet of an oil-temperature reducing device; the outlet of the oil-temperature reducing device is connected with the inlet of the oil tank. The improved straightening machine has the advantages that: the oil-temperature reducing device can be used for reducing the high oil-temperature in the straightening machine and prevents an electromagnetic valve from being damaged; the working pressure is guaranteed and the working efficiency is improved.

The invention discloses a two-position three-way normally opened type micro fuel oil electromagnetic valve with a buffer mechanism. The electromagnetic valve comprises an armature assembly. The armature assembly comprises an outer armature of a cup body structure. An inner armature is sleeved into the outer armature; a first ejector rod, a third spring and a spring seat are successively sleeved into an inner cavity of the inner armature; a second spring is placed in the inner cavity of the spring seat; the other end of the second spring is in contact with the inner bottom surface of the outerarmature; the spring seat, the third spring, the inner armature and the first ejector rod form an inner armature assembly, wherein the outer armature and the inner armature and the first ejector rod and the inner armature are in clearance fit. The electromagnetic valve has the advantages of being small in size, light in weight, high-temperature-resistant, low in power consumption, high in reliability, long in service life and the like, and solves the problems that an existing electromagnetic valve is large in size, heavy in weight, high in starting energy consumption and the like.

The invention discloses a control valve group of a hydraulic clutch. The control valve group comprises a valve body, wherein a functional valve core is mounted on the valve body; the valve body is provided with connection openings; an oil duct is arranged in the valve body; the functional valve core comprises a first electromagnetic exchange valve, a second electromagnetic exchange valve, a P opening overflow valve, an AB opening overflow valve, a pilot operated directional control valve, an inserting valve and a one-way valve; the connection openings comprise a high voltage input opening P, a hydraulic clutch driving connection opening C, a hydraulic clutch lubricating connection opening F1, a functional valve core oil return opening T1, a lubricant passage way oil return opening T2, a cooler oil inlet connection opening L1 and a cooler oil outlet connection opening L2. The control valve group can meet the flow requirement of a system during normal operation, meanwhile can obtain more lubricant, properly lubricates the fully rotating control valve group and other parts, guarantees certain operating pressure in a lubricant passage way, balances oil pressure in all oil ducts, ensures that the fluctuation is relatively small, and simultaneously and effectively cools the system while lubricating the system.

The invention belongs to the field of ceramic light sources, and in particular relates to a ceramic metal halide lamp shell. The ceramic metal halide lamp shell comprises a discharging cavity and capillary tubes arranged at the two ends of the discharging cavity, wherein each capillary tube comprises an inner tube section and a welding groove which are connected with each other; the inner tube section is close to the discharging cavity; the welding groove is positioned on the end face; the inside diameter of the welding groove is greater than that of the inner tube section; the welding grooverealizes air-tight seal of the discharging cavity by padding a welding flux; part of the outer surface of the discharging groove is provided with a light reflecting material layer; and a glass transparent glaze layer is covered on the outer surface, not provided with the light reflecting layer, of the discharging cavity. The ceramic metal halide lamp shell has the advantages of simple encapsulation, good sealing effect, high luminous efficiency and the like.

The invention relates to a control method and device of an electronic oil pump, electronic equipment and a storage medium. The control method of the electronic oil pump comprises the following steps that current oil pressure load information of a hydraulic system is obtained during triggering of a preset event, and the electronic oil pump is controlled to be opened or closed if the current oil pressure load information meets the preset conditions. By means of the control method, the essence is to control the opening or closing time of the electronic oil pump based on the current oil pressure load of the hydraulic system in real time, and the purpose that the adverse phenomenon that the service life of an electronic oil pump is affected due to the excessive load of the electronic oil pump is also avoided while the working pressure of a gearbox is ensured is achieved.