78results about How to "Reduce expansion force" patented technology

The present invention provides one kind of adaptive filled expanding sieve tube for preventing sand in oil and gas well, and belongs to the field of petroleum drilling and extracting tool technology. The adaptive filled expanding sieve tube consists of supporting slotted tube, special filling coupler, radial expanding cover, radial expanding composite filter element, supporting rack, expanding block, expanding screw, plug and other parts. During well operation, the adaptive filled expanding sieve tube is set in the oil reservoir and filled with high pressure carrying solid particles, so that the composite filter element and the radial expanding cover can expand radially to contact with the inner wall of the production casing or the uncased hole to block sand and control the size of the passed sand. Compared with available technology, the present invention has the advantages of lowered expanding force, low operation cost and other advantages.

The invention relates to a tool arrangement with a screw-in tool (1) and a tool receiver (7), the screw-in tool (1) having a thread (4) for engagement in a counter thread (11) on the tool receiver (7). According to the invention, the counter thread (11) and the thread (4) have different thread contours and therefore, in the screwed condition, these adapt to one another by elastic deformation.

The invention relates to the field of concrete, and particularly discloses environment-friendly anti-freezing concrete and a preparation method thereof. The concrete comprises the following raw materials in parts by weight: 240 to 280 parts of cement, 600 to 680 parts of fine aggregate, 25 to 65 parts of water, 2.5 to 2.9 parts of a water reducing agent, 1000 to 1400 parts of recycled aggregate, 4 to 8 parts of waste textile fiber, 25 to 30 parts of silica fume, 5 to 15 parts of metakaolin, 3 to 3.5 parts of nano-SiO2, 1.3 to 3.9 parts of calcium sulfate whiskers, 0.48 to 0.56 part of an air entraining agent, 0.072 to 0.084 part of basalt fibers and 1.44 to 1.68 parts of hydroxypropyl methyl cellulose. According to the concrete, waste resources are recycled, resources are saved, the environment is protected, the integrity and the compactness degree of the concrete are high, expansive force generated in the concrete under the freezing and thawing action is small, freezing resistance is high, and compressive strength after freezing and thawing circulation is high.

The invention discloses an expansive soil (rock) roadbed retaining swelling-reducing structure and a construction method thereof. The roadbed retaining swelling-reducing structure comprises a lateral ditch, a lateral ditch platform, an inverted filter, a swelling-reducing water draining layer, a breast board, a plate top concrete platform and a water draining hole, wherein the lateral ditch is a U-shaped lateral ditch; the lateral ditch platform is horizontally arranged at an edge of the lateral ditch; the inverted filter, the swelling-reducing water draining layer and the breast board are vertically arranged on the lateral ditch platform and are successively arranged on the exterior of the expansive soil (rock) from inner to outer; the plate top concrete platform is horizontally poured on the swelling-reducing water draining layer, the inverted filter and the expansive soil (rock); and the swelling-reducing water draining layer is arranged as an elastic elastomer. The construction steps are as follows: constructing the lateral ditch after completing the cutting earth rock excavation and stay pile construction; constructing the lateral ditch platform and leveling the plate bottom concrete; hoisting the breast board, mounting the breast board while paving the swelling-reducing water draining layer and the inverted filter; and constructing the plate top concrete platform. The expansive soil (rock) roadbed retaining swelling-reducing structure has the advantages of water draining function, obvious swelling-reducing effect, excellent water draining effect, convenience in construction and easily controlled quality.

A method for treating a patient diagnosed with a cardio-renal disease or disorder, the method comprising selecting a span of a renal artery having a first internal diameter, an artery wall; selecting a self-expanding stent having a cylindrical outer surface, the stent being configured to have a first external diameter in an unexpanded condition and being capable of expanding to have a second external diameter; implanting the stent in the span of the renal artery, and applying pressure to the at least one renal nerve with the stent, thereby at least partially modulating a function of the at least one renal nerve; then, reducing an elastic modulus of the stent when the stent has the second external diameter.

The invention relates to an instantaneous counter flow type heat exchanger which comprises a central heating water inlet, a central heating water outlet, a tap water inlet, a tap water outlet and two or more than two tap water heat absorption pipes, wherein two ends of the tap water heat absorption pipes are respectively communicated with a tap water communicating pipe; central heating supply pipes penetrate in the tap water heat absorption pipes and are communicated; one end of each communicated central heating supply pipe are connected with the central heating water inlet; and the other end of each central heating supply pipe are connected with the central heating water outlet. The instantaneous counter flow type heat exchanger is characterized in that the tap water communicating pipe is provided with one or more than one water plugging board. The heat exchanger enables a user to bathe by using a heat source of a heating pipe network, the heat absorption pipes do not scale, the cavity gap between two medium pipes is small, the cold fluid counter flows in a narrow cavity while covering a heat pipe, so that the heat conduction is quick, and the heat exchange capacity is high. The heat exchanger has the advantages of strong compression resistance, small hot fluid resistance, quick heat conduction and high efficiency, and the cold fluid counter flows in the narrow pipe cavity.

A method and apparatus for expanding a tubular below a restriction in a wellbore. An expandable tubular may comprise a first end having a first wall thickness, a second end having a second wall thickness, and a middle section disposed between the first and second ends and having a third wall thickness that is less than the first and second wall thicknesses. The first and second ends may include one or more grooves disposed along a length of the ends. A method for expanding a tubular below a restriction in a wellbore may comprise running the tubular past the restriction, wherein the tubular comprises a first end and a second end, each end having a wall thickness greater than a wall thickness of a middle section disposed between the ends. The method may include expanding the tubular, wherein the first and second ends of the expanded tubular have outer diameters greater than the outer diameter of the middle section.

A tool receptacle (2) for a screw-in tool (1) having a main body (13), which has a receiving region (14) including at least one conical contact surface (10) for supporting a corresponding conical support surface (9) of the screw-in tool (1). For thread-protection and for tightening with high concentricity and low production outlay, an insert (15) is disposed in the main body (13), said insert being movable transversely with respect to the longitudinal axis (17) of the main body (13) and being rotationally-fixed with respect to the main body (13) and having a mating thread (16) for a thread (6) on the screw-in tool (1).

The invention discloses a method for preparing alum-free vermicelli based on modified starch. The method comprises the following steps of: (1) preparing starch milk by taking starch as the raw material, and then, preparing cross-linked starch by taking phosphorus oxychloride as a cross-linking agent; (2) preparing starch milk by taking starch as the raw material, and then, preparing octenyl succinic acid modified starch by taking octenyl succinic anhydride as an esterifying agent; (3) preparing starch milk by taking starch as the raw material, and then, preparing high cross-linked starch by taking phosphorus oxychloride as a cross-linking agent; and (4) adding starch with a certain mass into water to prepare starch milk, rapidly pouring boiling water into the starch milk to prepare starchy sauce paste, adding the cross-linked starch, the octenyl succinic acid modified starch and the high cross-linked starch in a certain proportion, mixing and uniformly stirring the cross-linked starch, the octenyl succinic acid modified starch and the high cross-linked starch, placing the mixture into a vermicelli machine for extrusion forming, cooking the vermicelli for several seconds, then, rapidly placing the cooked vermicelli into cold water to cool and retrograde for several minutes, and drying to obtain a finished product of the vermicelli. Compared with the traditional vermicelli preparation method, the method has the advantages that no alum is used, the property of the vermicelli is improved, and the prepared vermicelli has favorable boiling fastness, favorable toughness and favorable retrogradation resistance.

A method and apparatus for expanding a tubular below a restriction in a wellbore. An expandable tubular may comprise a first end having a first wall thickness, a second end having a second wall thickness, and a middle section disposed between the first and second ends and having a third wall thickness that is less than the first and second wall thicknesses. The first and second ends may include grooves. A method for expanding a tubular below a restriction in a wellbore may comprise running the tubular past the restriction, wherein the tubular comprises a first end and a second end, each end having a wall thickness greater than a wall thickness of a middle section disposed between the ends. The method may include expanding the tubular, wherein the first and second ends of the expanded tubular have outer diameters greater than the outer diameter of the middle section.

The invention discloses a high-speed railway expansive rock soil deep cutting structure and a construction method thereof. The structure comprises: a plurality of reinforcing support piles, wherein the reinforcing support piles are divided into two rows and are symmetrically arranged at a deep cutting slope toe, and each row of reinforcing support piles are arranged at intervals; supporting crossbeams which is arranged on a foundation between the two reinforcing supporting piles which are symmetrically arranged; a buffer layer which is arranged on the foundation at the bottoms of the supporting cross beams; a waterproof layer which is arranged on a foundation between every two adjacent supporting cross beams; and a bearing plate which is connected to the tops of the supporting cross beamsand connected to the reinforcing supporting piles, wherein the bearing plate is used for arranging a rail structure. The technical problem of upwarp deformation of the high-speed railway caused by expansive rock and soil is effectively solved, and the high-speed railway expansive rock soil deep cutting structure has the characteristics of expansive rock and soil stability, controllable upwarp deformation, convenience in construction, economy, environmental protection, convenience in popularization and application and the like.

The invention discloses an elastic longitudinal joint device used for shield tunnel segments in swelling soil areas. The longitudinal joint walls of the segments are provided with rubber belts covering all the longitudinal joint walls; the rubber belt at a sealing groove is positioned between a sealing groove wall and a sealing gasket; the thickness P of the rubber belt is determined by a formulashown in the description; and in the formula, P' is the thickness of the rubber belt compressed under the action of the axial force of a lining structure and is 3 to 8 mm; E2 is the elastic modulus of the rubber belt; N is the axial force acted on the lining structure; and A is the action area of the axial force, and A=bh, wherein b is the length of the longitudinal joint of each segment, and h is the thickness of the segment. The device can greatly reduce the equivalent stiffness of a lining so as to reduce the swelling force acted on the lining and guarantee the safety and reliability of shield tunnel structures built in the swelling soil areas; meanwhile, the device reduces the internal stress of the lining structure, effectively reduces the reinforcement of the lining, and has high waterproof property.

The invention discloses an elastic longitudinal joint device used for shield tunnel segments in swelling soil areas. The longitudinal joint walls of the segments are provided with rubber belts covering all the longitudinal joint walls; the rubber belt at a sealing groove is positioned between a sealing groove wall and a sealing gasket; the thickness P of the rubber belt is determined by a formula shown in the description; and in the formula, P' is the thickness of the rubber belt compressed under the action of the axial force of a lining structure and is 3 to 8 mm; E2 is the elastic modulus of the rubber belt; N is the axial force acted on the lining structure; and A is the action area of the axial force, and A=bh, wherein b is the length of the longitudinal joint of each segment, and h is the thickness of the segment. The device can greatly reduce the equivalent stiffness of a lining so as to reduce the swelling force acted on the lining and guarantee the safety and reliability of shield tunnel structures built in the swelling soil areas; meanwhile, the device reduces the internal stress of the lining structure, effectively reduces the reinforcement of the lining, and has high waterproof property.

The invention relates to a secondary battery. The secondary battery comprises a naked battery cell, a first insulating cover and a second insulating cover, a first current collection part and a second current collection part, wherein the naked battery cell comprises a battery cell body, a first tab and a second tab; the first current collection part comprises an electrode pole connecting section, a transition section and a tab connecting section which are connected; the electrode pole connecting section is of a bent structure and forms a positioning cavity; the first insulating cover comprises a base body, and a positioning part and a clamping claw which are connected to the base body; the base body is provided with a containing space which is opened toward the first tab; the first tab is stored in the containing space; the positioning part is embedded into the positioning cavity; the clamping claw is in clamping joint with the transition section so that the first current collection part is in positioning connection with the first insulating cover; the second insulating cover covers the second tab; a gap is formed between the first insulating cover and the second insulating cover. According to the scheme provided by the invention, the risk that the he first insulating cover and the second insulating cover are expanded or torn so that the tabs are exposed is reduced, and the probability that the inner part of the secondary battery is short-circuit is reduced.