42results about How to "Avoid pressure leakage" patented technology

An injector has an inner sleeve between a needle pressure receiving face of a needle and a rear end face of a valve body. The inner sleeve is slidably fitted to an outer periphery of a middle shaft section of the needle. The inner sleeve receives a reaction force of a spring located between the inner sleeve and a pressurizing piston, so an axial tip end (edge section) of the inner sleeve is pressed against the rear end face to achieve close contact therebetween. Thus, a volume of a pressure chamber can be reduced, so a valve opening force for lifting the needle can be acquired efficiently. Accordingly, injection of a large flow rate can be performed by increasing a lift amount of the needle and also quick lifting of the needle can be performed.

The invention discloses an adjustable double cover body double-pressing-type pressure vessel. The adjustable double cover body double-pressing-type pressure vessel comprises a tank body, a tank cover, a movable bracket adjustable in height and an adjustable type pressing device, wherein the tank cover is installed on the tank body, and the adjustable type pressing device is installed on the movable bracket. An upper circular ring installation plate and a lower circular ring installation plate are arranged at the joint of the tank cover and the tank body, and the tank cover is further provided with a hydraulic opening. The hydraulic opening is provided with a detachable hydraulic cover. According to the adjustable double cover body double-pressing-type pressure vessel, the closing mode of two door covers is also of a pressing type, door slots between the two door covers can be all pressed and blocked through long-strip pressing plates installed on a second hydraulic cylinder, and in this way, opening and closing of the door covers are very convenient; moreover, each long-strip pressing plate is provided with a sealing rubber pad, after the door slots are pressed through the sealing rubber pads, the sealing performance can be improved, and pressure leakage is prevented; and in addition, clamping blocks arranged on the long-strip pressing plates are pressed into clamping grooves in the door covers during pressing, not only can positioning be conducted, but also the stability can be reinforced, the impact resistance is improved, and the situation that the door covers are opened due to excessive pressure or accidental causes is prevented.

The invention provides a process method for strengthening the pressure resistance quality of aluminum alloy, which belongs to the technical field of aluminum alloy castings. The process method for strengthening the pressure resistance quality of aluminum alloy can improve the aluminum The pressure resistance quality of alloy castings. The process method configures a kind of percolating fluid, which gradually infiltrates the internal looseness and pinholes of the casting under positive pressure conditions, and heats, heats, and cools the casting in sections, so that there is always a certain temperature gradient on the inner wall of the casting, improving the quality of the casting. The infiltration effect of the casting makes the infiltration fluid finally condense and solidify under positive pressure, preventing the final pressure leakage.

The invention discloses a device for measuring and controlling the crimping position of an aluminum crimping pipe of a power transmission line, comprising a first clamping plate, wherein the first clamping plate is in an "L" shape, and one end of the first clamping plate is connected with a scale in the "L" shape, A sliding block is slidably connected to the scale, and steel arms are respectively fixed at both ends of the sliding block; a second clamping plate is arranged opposite the first clamping plate, and the first clamping plate and the second clamping plate clamp the steel anchor hanging ring , one end of the steel anchor hanging ring is pressed against the limit plate of the first splint; connected to the connecting part of the steel anchor hanging ring, the steel anchor connected to the connecting part passes through the pipe along the length of the scale direction extension. In the present invention, by aligning the steel arm with the end of the connecting portion or the end of the wire, when the aluminum crimping pipe is sleeved on the connecting portion, the outer wall of the aluminum crimping pipe can be pressed against the steel arm by pressing the steel arm. Leave traces, and squeeze the aluminum crimping tube according to the traces, so as to avoid the occurrence of leakage or overvoltage of wires or connecting parts.

The invention discloses a fluid loss reducer and a preparation method thereof, belonging to the technical field of oil field cementing. The fluid loss reducer provided by the embodiment of the present invention includes: 100 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 0.1-0.5 parts by weight of chain monomers, 1-3 parts by weight of lubricant, 1-3 parts by weight of surfactant, 3-5 parts by weight of cyclic monomer, 8-10 parts by weight of amide monomer, 1-3 parts by weight of carboxylic acid monomer and 300-400 parts by weight of water. The fluid loss reducer provided by the embodiment of the present invention is suitable for well cementing operations in salt-gypsum layers. The salt-containing high-density cement slurry prepared with it has excellent stability and rheological properties under the condition of low liquid-solid ratio. Under the condition of temperature difference, the strength develops rapidly and the strength is high. Under the condition of narrow safe density window cementing in salt-gypsum layer, it can effectively reduce the flow resistance of high-density cement slurry containing salt, so as to effectively ensure the safety of cementing construction and improve the quality of cementing.

The invention relates to the technical field of gate valve replacement devices, and is an expansion core type mechanical belt pressure replacement valve device, which includes a fixed frame, a push rod, a connecting plate, a pushing plate, a process flange and a sealing flange. There are no less than two double-headed screws fixed between them, no less than one hydraulic cylinder is fixed on the connection plate, there is a passage hole in the middle of the connection plate, and there is a piston rod in the hydraulic cylinder, the piston rod and the push plate fixed together, the right end of the push rod is fixed on the push plate, and the middle part of the push rod is located in the passing hole. The invention has a reasonable and compact structure and is easy to use. It can replace the gate valve under pressure. In the process of replacing the gate valve, it can ensure good sealing performance, prevent pressure leakage, and avoid damage to the oil layer when the gate valve is replaced by killing the well. Pollution and crushing, thereby avoiding the resurrection of the crushed oil layer, and avoiding the sewage discharge operation of the polluted oil layer, saving the cost of oil and gas exploitation 。

The invention provides a downhole runner-type pressure control device, and a downhole pressure-control well drilling system and method. The downhole runner-type pressure control device comprises an inner cylinder connected with a drilling tool, an outer cylinder capable of rotating relative to the inner cylinder, a control assembly connected to the outer cylinder for receiving an operation instruction and conducting instruction transforming, and a linkage assembly connected with the outer cylinder and the control assembly; and the linkage assembly changes the area of a runner in a wellbore under the effect of the control assembly through a linkage action, and thus wellbore pressure adjusting is achieved. The downhole runner-type pressure control device can apply the return pressure in thedownhole and only apply the return pressure to the position above the stratum needing return pressure, and thus drilling leakage is reduced or prevented.

The invention discloses a pressure vessel with double cover bodies. The pressure vessel comprises a tank body and a tank cover arranged on the tank body, wherein an upper mounting plate and a lower mounting plate are separately arranged at connecting parts between the tank body and the tank cover and are fastened together through arranged hoop bands; hydraulic openings are formed in the tank cover; and a detachable hydraulic cover is arranged on each hydraulic opening. According to the pressure vessel disclosed by the invention, the tank cover and the tank body are arranged by clamping through the hoop bands; hoop grooves of the hoop bands can wrap and clamp the upper and lower mounting plates therein; one end parts of the hoop bands only need to be connected, so that one ends of the hoop bands only need to be opened when the tank body is opened; transverse grooves and transverse luges are separately arranged on the side walls of the upper and lower mounting plates and in the hoop grooves; and the transverse grooves and the transverse luges are matched for use, and are mutually pressed, so that the fastness of the tank cover and the tank body is improved, and the sealing property is also enhanced.

The invention discloses a pipe string for well completion and cementation and a method, and belongs to the field of oil exploitation equipment. The pipe string comprises a sleeve string, an upper packer, an annular hollow casing, a lower packer, a ball base casing and a float shoe which are connected and communicated with one another from top to bottom. The pipe string also includes a ball base arranged in the ball base casing through shearing nails, a cement slurry outlet hole is formed in the upper end of the upper packer, and a cement slurry inlet hole is formed in the lower end of the lower packer. An annular cavity is formed in the wall of the annular hollow casing, and the upper and lower ends of the cavity are communicated with the cement slurry outlet hole and the cement slurry inlet hole respectively. By using the upper and lower packers to isolate an oil layer, cement slurry is not directly in contact with the oil layer, pollution caused by the cement slurry to the oil layeris avoided, the cement slurry is prevented from extruding the oil layer and causing a leakage problem, and the leakage problem of the oil layer is solved. In short, the pipe string for the wall completion and cementation and the method can not only ensure well completion and cementation operation but also increase the success rate of the well completion and cementation operation.

An elastic meshing type straw compression roller belongs to the technical field of straw compression machinery. The present invention consists of a first pressing roller assembly and a second pressing roller assembly. The two pressing roller assemblies have the same structure and opposite directions. The pressing roller assemblies are both composed of a left end cover assembly. , Pressure roller shaft assembly, roller assembly, shrapnel assembly, rubber strip assembly and right end cover assembly. The components of the two pressure roller assemblies are connected in the same way, but the spring plates are arranged differently. The first pressure roller spring plates are arranged in a left-handed form, and the second The roller shrapnel is arranged in a right-handed manner, and the two are installed in a spiral mesh to perform elastic meshing compression on the straw. The invention can realize forced pushing and feeding of straw compression, and at the same time, elastically compress straws with different shapes and characteristics, so as to solve the problems of straw slippage, difficulty in feeding, leakage or uncompaction in the process of straw compression, and can be continuously compressed with high strength. Increase the compression effect and efficiency of straw.

The invention provides a pancake proportion uniformizing device and method for shredded pancake production, the pancake proportion uniformizing device for shredded pancake production comprises a conveying unit and further comprises a bottom oil return unit, and the bottom oil return unit used for oiling the conveying unit is arranged on the side portion of the conveying unit; the top feeding unit used for scattering chopped green onion on the surface of the dough belt, compacting and oiling is arranged at the top of the conveying unit; the oil pressing unit used for uniformly pressing sprayed oil on the upper surface of the dough belt is arranged on the side part of the top feeding unit; the oil pressing unit comprises an outer connecting rod. The chopped green onions are scattered on the dough belt, the chopped green onions are compacted into the dough belt through the pressing plate, then the chopped green onions are adhered by dough, the surfaces of the compacted chopped green onions are sprayed with oil and pressed uniformly, the chopped green onions are fixed and protected in the dough belt, and the situation that the chopped green onions are stacked unevenly in the overturning process is reduced.