63results about How to "Prevent pressure leaks" patented technology

The invention discloses a casting process of a valve casing. During smelting, stainless steel 1Cr13 foundry returns and low-carbon steel scraps are used as raw materials and smelted into casting molten steel in an intermediate frequency furnace; during casting, a resin sand two-bin modeling is adopted for a valve casing casting mould (1) to manufacture a core, during core manufacturing, an intermediate connection part of a mud core No.1 is connected by a ceramic pipe (4), chromite sand (5) with the thickness of 15mm is placed on a part that is easy to leak by pressure, two heat insulation dead heads (2) in specification of 80*120*120 are designed to be arranged on the valve casing casting mould (1), a shaped chiller (3) with the thickness of 20mm is designed to be arranged on a tail flange part and used for an upper bin and a lower bin by half respectively, vent holes of phi15 are pierced on the top of a flange, and a slag trap (6) with the height of 150mm is arranged on a connecting part between a transverse casting runner and an internal casting runner. The invention overcomes the casting defects of sanded vent holes, burning sand on surface, and the like, prevents the situation of leakage by pressure of the valve casing in a 69Bar pressure test due to more and complex mud cores, and meets the requirements of the valve casing on chemical composition and mechanical property.

The present invention provides a pipette device for moving or transferring micron quantities of fluid and cells, particularly oocytes/embryos, with a simplified pipette tip loading and unloading process. The present invention further provides a pipette device comprising a controller by which air pressure inside and outside of the controller can be intentionally balanced. Methods of manufacture and use of the pipette device of the present invention are also provided.

The invention relates to improvement of a pressure gauge verification technology, in particular to a full-automatic pressure gauge verification table and a full-automatic verification method; and thefull-automatic pressure gauge verification table comprises a verification table, a switch, a code scanning device, a camera adjusting mechanism, a camera, a gauge clamping mechanism, a gauge knockingmechanism, a display, a controller and a gas circuit control system; the camera adjusting mechanism comprises a sliding base and a sliding block, the sliding block is in sliding fit with the sliding base, the sliding base is inclined, the camera is installed on the sliding block and faces the gauge clamping mechanism, the gauge knocking mechanism comprises a vertical rod, a telescopic air cylinderand a push rod, the push rod is connected with a telescopic end of the telescopic air cylinder, and a cylinder body of the telescopic air cylinder is installed on the vertical rod. The full-automaticpressure gauge verification table has the advantages of less manual intervention, high automation integration level and high detection accuracy, and can realize the automatic pressure gauge detectionfunction of scanning once, knocking for three times and easily detecting the pressure gauge.

The invention provides a rotary compressor, comprising a housing; a cylinder with a compression chamber and a blade groove, wherein the blade groove is composed of, a blade guide part formed by makingan outward depression of the inner wall of the compression chamber, and an enclosed chamber arranged outside the blade guide part and having a width that is more than that of the blade guide part bya predetermined expansion width; blades capable of moving forwards and backwards along the blade groove and simultaneously partitioning the compression chamber; a flange part for sealing the upper andlower openings of the cylinder; and a communication part, which passes through the outer side surface of the cylinder and extends to the enclosed chamber along the direction different from the movingdirection of the blades, for providing high pressure or low pressure for the enclosed chamber. Thus, the rotary compressor of the invention can enable the deformation of the parts to be minimized, thereby preventing the pressure leakage of the compression chamber.

The invention discloses an automatic-control constant-pressure throttling valve. The automatic-control constant-pressure throttling valve comprises a valve body and an execution mechanism. The execution mechanism comprises a cylinder body, a cylinder cover, a piston, a pressure tapping pipe and an elastic element. The cylinder body is fixedly arranged above the valve body, the cylinder cover is fixed to the upper portion of the cylinder body, the piston is movably arranged in the cylinder body, the lower portion of the piston is fixed onto a valve rod of the valve body, and the elastic element is fixedly arranged between the cylinder body and the valve body and fixedly connected with the piston. A pressure tapping end of the pressure tapping pipe is communicated with an output end of the valve body, and a pressure discharging end of the pressure tapping pipe is arranged above the piston in the cylinder body. The automatic-control constant-pressure throttling valve has the advantages that flow output of the throttling valve can be automatically controlled under the action of pipeline pressure, and the problem that a safety valve in the prior art is prone to jumping automatically under overhigh pressure is solved.

Provided is a gas pressure detector. The gas pressure detector comprises a water-gas separation tank, a gas pipe and a gas pressure meter. The water-gas separation tank is provided with a water inlet and a water drainage sluice valve. The gas pressure detector further comprises a four-way distribution valve, a high-pressure pipe and a connecting rod. The first end of the four-way distribution valve is communicated with the gas pipe, the second end of the four-way distribution valve is communicated with the gas pressure meter, and the third end of the four-way distribution valve is communicated with the water inlet in the water-gas separation tank through the high-pressure pipe. The gas pressure detector mainly solves the problem that in the prior art, gas pressure measurement is inaccurate, enables gas to be completely separated from confined water in a coal seam in the coal seam pressure detecting process, and eliminates the water pressure factor affecting coal seam gas pressure.

The present invention provides a improvement method of an internal surface of a hole of a casting in which an internal surface of a hole formed in a casting made of nonferrous metal is processed at high speed without excessively heating the same, thereby splitting and eliminating casting nests which are peculiar to the casting, and metal structure is reformed so that fluid does not leak from the casting nests formed in the casting, and to provide a casting structure whose hole internal surface of is improved, and a processing tool of the internal surface. A tool having a cross section area greater than that of a hole formed in the casting is sent and press-fitted into the hole while rotating the tool, friction heat is generated between a surface of the tool and the internal surface of the hole and then, the tool is pulled out from the hole in a state in which the rotation of the tool is maintained, thereby reforming a metal structure of the internal surface to form a reformed layer.

The invention relates to an automatic feeding and assembling system for a rear cradle bearing. The system comprises two discharging mechanisms arranged side by side, a feeding turnover mechanism and a press-fitting mechanism, each discharging mechanism comprises a stock bin, and a baffle and a pressing plate that are installed at the lower end of the stock bin, the baffles and the pressing plates can stretch into the stock bins from the upper side faces of the stock bins, the pressing plates are arranged above the baffles, the feeding turnover mechanism comprises two clamping finger blocks which are arranged corresponding to the two discharging mechanisms respectively and can move oppositely, the two clamping finger blocks are installed on the same rotating shaft through connecting pieces respectively, the press-fitting mechanism comprises a positioning seat and bearing pressure heads which are installed at the two ends of the positioning seat and are oppositely arranged, the two bearing pressure heads can move oppositely, and the clamping finger blocks correspond to discharge holes of the stock bins and the bearing pressure heads respectively before and after rotation. According to the automatic feeding and assembling system, automatic feeding, conveying and press-fitting of bearings can be achieved, the labor cost is reduced, the assembling efficiency is improved, the situation of pressure leakage is avoided, and the overall quality of the rear cradle is guaranteed.

The invention discloses a pressurization test device for a cladding tube. The pressurization test device for the cladding tube comprises a test rack, a test tube, a first sealing member, a second sealing member, a third sealing member and a fourth sealing member, wherein the test tube is arranged on the test rack, the test tube sleeves a part of the cladding tube, a first part of the cladding tubeextends out of the test tube from a first end of the test tube, a second part of the cladding tube extends out of the test tube from a second end of the test tube, a test cavity is defined between the test tube and the cladding tube, and a water inlet and a water outlet which are communicated with the test cavity are formed in the peripheral surface of the test tube; the first end and the first part of the test tube are sleeved with the first sealing member, the second end and the second part of the test tube are sleeved with the second sealing member, the third sealing member is arranged atthe first end of the cladding tube, and the fourth sealing member is arranged at the second end of the cladding tube. The pressurization test device for the cladding tube can be used for carrying outa simulation test of in-tube pressurization on the cladding tube in a high-temperature and high-pressure water environment.

The invention discloses an automatic nozzle adjusting mechanism applied to a fluidized bed type pulverizer, comprising: a plurality of mounting seats for rotatably fixing nozzles, the mounting seats being mounted on the side wall of a fluidized bed; the driving mechanism is used for controlling the nozzle to rotate, and the driving mechanism is fixed on the side wall of the fluidized bed. According to the invention, the angle of the nozzle of the fluidized bed can be adjusted, so that the crushing requirements of particles with different sizes can be met without replacing different fluidized beds, the use efficiency of the fluidized bed and the adaptability to different materials are greatly improved, and the requirements of customers are greatly met.

The invention discloses a pressure automatic leakage stopping type gate valve, and belongs to the field of gate valves. According to the scheme, the problems that when a valve plate in the gate valve is still closed and is not tight after being closed and leakage occurs, generated air pressure enters pressure inlet holes in two sides and flows into air inlet holes, an expansion air bag expands under the action of pressure, a sealing piece is gradually extruded when the expansion air bag continuously expands upwards, a sealing layer is attached to the surface of the valve plate to plug the gate valve, after the sealing layer is attached to the surface of the valve plate, one layer of the surface of the sealing layer is bonded to the surface of the valve plate, the thickness of the surface of the valve plate is increased, and the phenomenon of leakage is not prone to occurring in the gate valve plugging process of the valve plate next time are solved. When the phenomenon of continuous leakage still occurs next time, the sealing layer continues to be bonded to the surface of the valve plate to plug the valve plate, so that the gate valve has the automatic leakage stopping and repairing functions after leakage, the working efficiency of the gate valve is improved, and the phenomenon that the gate valve needs to be disassembled and maintained multiple times is avoided.