51results about How to "Reasonable pressure" patented technology

The invention provides a technique and an apparatus for producing a reinforced thermoplastic pipe. The technique comprises the following steps: 1) sending granular PE to a hopper of an extruding machine by negative pressure; 2) heating PE plastic by a first extruding machine, and continuously extruding the PE plastic by a die head with high pressure; 3) cooling the molten PE by water into a PE internal pipe under negative pressure through a vacuum calibrating sleeve of a vacuum water tank; 4) cooling and forming the PE internal pipe continuously in a spray water tank; 5) drying the surface of the PE internal pipe taken from the spray water tank by a first air cooler; 6) pulling the PE internal pipe continuously and stably by a hauling machine which provides power for forming the PE internal pipe; 7) winding a plastic covered reinforcing band made of steel wire or fiber yarn twisted ropes by a winding machine with constant tensile force in opposite directions respectively on the PE internal pipe or the outermost layer of the PE internal pipe; 8) wrapping the molten PE plastic on the outside of the wound reinforcing band through an external composite die head by a second extruding machine to form a wrapped RTP pipe; 9) spraying and cooling to form the wrapped RTP pipe in the water tank; and 10) drying the surface of the RTP pipe taken from the water tank by a second air cooler. The technique is simple and feasible. The apparatus has simple structure, good operating performance and stable and reliable operation.

The invention discloses a crack-substrate coupling flow damage evaluating device and method by simulating formation conditions. The device mainly consists of a kettle body 4, a rock core 1, a crack 6, a simulated well 7, a pressurized capsule 3, a resistance probe 16, a pressure sensor 18, a data collecting system 17 and a work liquid circulation system, wherein the rock core 1 is arranged in the kettle body 4; the pressurized capsule 3 wraps the periphery of the rock core; the kettle body is provided with an axial pressure injecting opening, a peripheral pressure injecting opening and a gas inlet; the crack 6 and the simulated well 7 are arranged in the rock core; nine drilling holes extending into the rock core are distributed in the rock core; the resistance probe 16 is arranged in the drilling holes; the resistance probe 16 is connected with the pressure sensor 18; the resistance probe and the pressure sensor are connected with the data collecting system 17; the simulated well 7 is connected with the work liquid circulation system. The circum-well secondary stress condition and the formation radial flow of a crack-substrate system are simulated for determining the damage degree of the crack-substrate system by the device. The device and the method have the advantages that the principle is reliable; the operation is convenient; scientific and accurate quantitative reservoir damage evaluation can be made.

The invention provides a heat exchanger which comprises two collecting boxes and heat exchange tubes, wherein the heat exchange tubes are arranged between the two collecting boxes; the heat exchange tubes are flat heat exchange tubes; fins are arranged in the flat tubes; the fins comprise inclined parts; a fluid channel is partitioned by the inclined parts into a plurality of small channels; the larger the distance between the flat tubes and an inlet tube is, the larger the lengths h of the bottom sides of the isosceles triangular communication holes in the flat heat exchange tubes are. According to the heat exchanger, as the lengths h of the bottom sides of the isosceles triangular communication holes are changed along with the distance between the flat heat exchange tubes and the inlet tube, fluid can be enabled to flow to the heat exchange tubes with small flow resistance and far away from the inlet tube, the fluid can be uniformly distributed inside the heat exchange tubes, the heat exchange efficiency can be improved, and the service life can be prolonged.

The invention discloses a clean production line for furfural and a production method of the furfural. The clean production line comprises process facilities for sieving, crushing, acid preparation, hydrolysis, prefractionation, separation, rectification and the like and also further comprises treatment facilities for waste gas, wastewater and waste slag. The hydrolysis refers to charging corncobs mixed with acid to a hydrolysis pot at a charging density of 0.18 to 0.2t/m<3>, wherein the steam pressure is 0.5 to 1.0 MPa and the steam temperature is 140 to 180 DEG C in the hydrolysis pot; the tower top temperature is 94 to 97 DEG C and the tower bottom temperature is 98 to 108 DEG C in a prefractionation tower, furfural-containing water vapor is discharged from the tower top, and is condensed into liquid through a condenser, the liquid then enters a furfural separation tank to be subjected to water-furfural separation, and furfural liquid about 90 to 93% at the bottom automatically flows to a raw furfural tank. The clean production line disclosed by the invention can be used for scale processing of corncobs, and a separation effect of acetic acid and water can reach an international advanced level.

The invention provides a manufacturing method of an aluminum alloy product. The manufacturing method of the aluminum alloy product comprises the following steps: a first aluminum alloy plate and a second aluminum alloy plate are provided, wherein a surface to be welded of the first aluminum alloy plate is a first welded surface, and a surface to be welded of the second aluminum alloy plate is a second welded surface; the first welded surface is a plane, and a groove is formed in the second welded surface; or grooves are formed in the first welded surface and the second welded surface; the first welded surface and the second welded surface are oppositely arranged and bonded, and a water way structure, surrounded by the grooves, is formed between the first welded surface and the second welded surface to form an initial aluminum alloy product; the initial aluminum alloy product is filled in a cover; the cover is degassed to form a vacuum cover; then, a hot isostatic pressing process is performed on the initial aluminum alloy product; and the vacuum cover is removed to obtain the aluminum alloy product. As the hot isostatic pressing process is applied on the initial aluminum alloy product, the welding strength of the formed aluminum alloy product is improved, and meanwhile, deformation or even blockage of the water way structure is prevented.

The invention relates to a device for ventilating a crankcase of a V-type engine belonging to the power device technical field. The device mainly comprises a left cylinder head, a right cylinder head, a left cylinder head cover, a right cylinder head, and an air inlet pressure stabilizing chamber. The device is characterized in that the insides of the left cylinder head cover and the right cylinder head cover are provided with oil baffle plates, and oil-gas separation chambers and control switch chambers are formed by isolating the oil baffle plates, the insides of the control switch chambers are provided with one-way valves, the pipe passages are arranged inside the control switch chambers; after the pipe passages of the two head covers are communicated with each other, the pipe passages of the two head covers are connected to the bottom of the air inlet pressure stabilizing chamber, template one-way valves are respectively arranged inside the two head covers, and the pipe passages of the two head covers are connected to the bottom of the air inlet pressure stabilizing chamber after the pipe passages of the two head covers are communicated with each other. The device can guaranty pressure in the crankcase to be reasonable and stable and a passing route of an oil mist is long when removing the surplus gas in the crankcase, thereby improving removal effect for the oil mist, preventing the overmuch oil mist from entering the combustion chamber, reducing engine oil consumption, and improving safety performance of the whole engine.

The invention provides an automatic tightening device for a dovetail slide block type guide rail, which belongs to the technical field of slide block type guide rails. It includes a hexagonal screw head, a connecting belt, a belt tensioner, a driving pulley, the upper end of the tightening drive piston rod of the tightening drive cylinder is connected to the tightening support plate, and the first screwing shaft is rotatably arranged on the first screwing shaft support seat and the tightening support On the board, the second screw shaft is rotatably arranged on the second screw shaft support seat and the tightening support plate, the third screw shaft is rotatably arranged on the third screw shaft support seat and the tighten support plate, and the fourth screw shaft is rotatably arranged on On the fourth screw shaft support seat and the tightening support plate, there are hexagonal screw heads under the first screw shaft, the second screw shaft, the third screw shaft and the fourth screw shaft, and the connecting belt is closed and surrounded by the driving pulley , Belt tensioner, first arc wheel, second arc wheel, third arc wheel and fourth arc wheel. The invention automatically tightens the hexagon socket head screw to realize the fast connection of the connecting plate and the sliding block of the dovetail groove.

The invention provides an intravenous infusion anti-leakage device used for operating room nursing. The device comprises a rectangular dressing (1), pressure and temperature sensors (2), a liquid control valve (3), a PLC (programmable logic controller) (4), an interactive display terminal (5) and a control switch, wherein the dressing (1) comprises a surface layer (11) and a bottom layer (12); the surface layer (11) is made from breathable transparent materials; the bottom layer (12) is made from breathable self-adhesive materials; a hole is reserved in the middle of the bottom layer (12) and serves as an observation window (7); a plurality of pressure and temperature sensors (2) connected with the PLC (4) are arranged around the hole in the bottom layer (12); the liquid control valve (3) is arranged at a liquid outlet of an intravenous infusion device (6); the PLC (4) is connected with the liquid control valve (3) and controls the liquid control valve to open and close; the interactive display terminal (5) is connected with the PLC (4); the control switch controls the device to open and close. An intravenous infusion anti-leakage method used for operating room nursing is used for judging whether liquid leakage happens by using the device. By adopting the device and the method, whether leakage happens to intravenous infusion can be accurately judged and the infusion device can be timely closed, thus reducing harms caused to patients.

The invention discloses an operating room nursing venous transfusion leakproof device and a control method thereof. The operating room nursing venous transfusion leakproof device comprises a gravity sensor, an alarm unit, a sensor detecting unit, an electromagnetic valve unit and a controller. The control method of the operating room nursing venous transfusion leakproof device comprises setting a pressure and temperature critical value of the controller; according to the pressure and temperature critical value, determining a maximum processible pressure and temperature capacity; according to collecting platform power management technology, combining a plurality of first work tasks into a first continuous work task; determining whether the first pressure and temperature capacity of the first continuous work task is larger than the maximum processible pressure and temperature capacity to achieve control of the entire operating room nursing venous transfusion leakproof device. The operating room nursing venous transfusion leakproof device and the control method thereof can ensure the nursing operation quality and avoid medical negligence and are high in accuracy, simple in structure and convenient to operate.

The invention discloses a gas tightness and sealing intensity test method for an accumulator shell. The gas tightness and sealing intensity test method comprises the steps of filling water into the accumulator shell, sealing the shell, putting the shell into an observation box, adjusting air pressure to increasingly aerate the shell, taking the air pressure during the water leakage of the shell as the air tightness index of the shell, turning off a safety valve when the shell suddenly bursts, and recording the air pressure value as the sealing intensity index of the shell. According to the method, the sealing quality of the accumulator shell can be detected, the operation is simple and convenient, the investment is low, moreover, the sealing intensity of the accumulator shell and the pressure bearing value of the shell can be displayed in a digitalized manner.

The invention provides a heat exchanger. The heat exchanger comprises two headers and heat exchange pipes arranged between two headers. The heat exchange pipes are flat heat exchange pipes. Fins are arranged in the flat pipes. The fins include inclined parts. A fluid channel is divided into a plurality of small channels through the inclined parts. The numbers of the communicating holes distributed in the different flat heat exchange pipes are different, and the longer the distances of the flat heat exchange pipes away from an inlet pipe are, the larger the numbers of the communicating holes distributed in the flat heat exchange pipes are. By means of the heat exchanger with the variable numbers of the communicating holes, due to the fact that the numbers of the communicating holes are set to be changed along with the distances of the heat exchange pipes away from the inlet pipe, fluid flows into the heat exchange pipes which are low in flowing resistance and is away from the inlet pipe, the fluid is evenly distributed in the heat exchange pipes, the heat exchange efficiency is improved, and the service life is prolonged.

The invention discloses a framing machining method of core-shell structure door and window profiles, relates to the field of building decoration engineering, and aims to solve the problems that existing door and window profiles are not reasonable in assembly process, and door and window profile corners are not high in bonding strength and accuracy, close in sealing, attractive and durable. The framing machining method includes the steps: S1 cutting the profiles; S2 machining the ends of the profiles; S3 preassembling the machined profiles; S4 starting a framing device; S5 mounting a profile frame; S6 clamping the profile frame; S7 applying pressure to the frame; S8 releasing the pressure. By the aid of the steps, longitudinal parallel rods and transverse parallel rods relatively motion through hydraulic transmission, the assembled door and window profiles can be effectively assembled in the device, and the method solves the quality problems that in a traditional assembly process, force is unequally applied, errors are large, the ends of the profiles are easily damaged, connectors have biased and the like.

The invention relates to a centrifugal chemical pump which comprises a pump body, an impeller and a pump shaft driving the impeller to rotate; wherein the pump body comprises an upper shell; the upper shell comprises a bottom plate, a ring-shaped lateral wall, a water inlet, a water outlet and a cog; the lateral wall is arranged on the edge of the bottom plate in a winding manner, the water inlet is arranged at the top end of the upper shell, the water outlet is arranged in the position of the lateral wall near the bottom plate, the cog is involute-structured, namely, the cog is arranged in the intersection position of the bottom plate and the lateral wall in a winding manner, both ends of the cog are respectively arranged at the both ends of the water outlet, and the thickness of the cog gradually turns smaller; the impeller arranged on the upper shell of the pump body comprises a rib wheel, a cover wheel and a plurality of main blades; wherein, the cover wheel is arranged above the rib wheel in an overlapping manner, the arc-shaped main blades are arranged between the rib wheel and the cover wheel. The centrifugal chemical pump can achieve reasonable pressure and flow rate, ensure low energy consumption and effectively prevent the pump shaft from being corroded.

The invention discloses a hydraulic control system of a building block forming machine. The hydraulic control system is capable of realizing process pressurizing control over a forming mechanism in abuilding block production process and can be combined with a main building block forming machine to realize the production of building blocks. The system specifically comprises a first power system, asecond power system, a die transferring system, a surface material distributing system, a die releasing and propping-out system, a bottom material distributing system, an oil returning system and anoil tank, wherein the first power system is connected to the second power system; the first power system internally comprises a part for supplying power to a pressing head pressing part and a materialhomogenizing part; the second power system is correspondingly connected to the die transferring system, the surface material distributing system, the die releasing and propping-out system and the bottom material distributing system; an inlet of the oil returning system is correspondingly connected to the first power system, the bottom material distributing system, the surface material distributing system, the die transferring system and the die releasing and propping-out system; and an outlet of the oil returning system is connected to the oil tank. The system is capable of realizing safety sequence action under different technology demands of the building block forming machine, and high quality building blocks can be produced, and moreover, the system utilization rate can be increased; and the system is efficient and stable.

The invention discloses a horizontal shaft eccentric semi-ball valve. A valve element is installed through a horizontal shaft structure, the axis of a valve rod of the horizontal shaft eccentric semi-ball valve is perpendicular to the flowing direction of media in a valve body and is horizontally arranged, the lower end of a flow channel is not occupied, the lower end of the flow channel can be designed to be smoother than a vertical eccentric semi-ball valve, and flowing resistance is reduced. A cylindrical boss concentric with the valve element is arranged on the valve element, a sealing ring is arranged on the boss in a sleeving manner at an interval, the sealing ring is provided with a spherical-crown-shaped sealing face, an air bag ring is arranged in a clamping gap formed by the bossand the sealing ring, and the sealing ring and the valve element are fixed through a fixing assembly. The center of a valve element sealing spherical crown and the center of a valve seat can be adjusted to be concentric in the assembling process, machining errors are overcome, and effective sealing is guaranteed.

The invention relates to a super-hybrid composite material battery box and a preparation method thereof, the super-hybrid composite material battery box comprises an inner-layer metal shell, an outer-layer metal shell and a sheet molding compound, the inner-layer metal shell is sleeved in the outer-layer metal shell, and the sheet molding compound is connected between the inner-layer metal shell and the outer-layer metal shell. According to the battery box disclosed by the invention, a metal-sheet molding compound (SMC)-metal laminated structure is adopted, and the metal shell with the two layers of outer surfaces has electromagnetic shielding and flame-retardant effects while providing certain strength, and can be directly subjected to electrophoretic coating at the same time. The sheet molding compound composite material in the middle reduces the weight of the battery box, provides higher strength and rigidity, is easy to form, and has higher bonding strength with metal.