9results about How to "Avoid pressure instability" patented technology

A prefabricated outer side formwork truss structure for immersed tubes includes a truss body and a longitudinal connection assembly. The truss body includes an inner chord of the body, an outer chord of the body, a horizontal web of the body and an oblique web of the body. The inner chord of the body is welded with two reinforcing ribs. The upper and lower sides of the reinforcing ribs are respectively welded to the inner ends of two adjacent oblique webs of the body. The reinforcing ribs are welded to the inner ends of a corresponding horizontal web of the body, and the two reinforcing ribs are connected to steel tie rods. In the embodiment of the present invention, the steel tie rods are connected to the reinforcing ribs installed on the inner chord of the body. The reinforcing ribs connect two oblique webs of the body and one horizontal web of the body, shortening the force transmission path and preventing the web from being compressed and instable. The webs are connected on both sides of the reinforcing ribs as anchor points of the steel tie rods to reduce the span, reduce the local bending moment, and use a small amount of steel. The side formwork truss structure bears the steel bar system conversion load generated by the top truss and can withstand the concrete side pressure, thereby achieving the purpose of reducing the number of steel tie rods.

The present invention discloses a vibration-damping and noise-reducing U-shaped beam for elevated urban rail transit. The U-shaped beam is composed of a bottom plate, a first web located on one side of the bottom plate, a second web located on the other side of the bottom, a first web upper flange located on the top of the first web, and a second web upper flange located on the top of the second web, forming a U-shaped cross-sectional structure. The first webs of the two U-shaped beams are arranged adjacent to each other, and are characterized in that the first web and the second web are both thickened structures, and the thickness gradually increases from top to bottom. The inner side and outer side of the first web are non-concentric circular curves, the inner side and outer side of the second web are non-concentric circular curves, the first web upper flange is F-shaped, and the second web upper flange is T-shaped. The bottom plate and web form of the present invention can significantly reduce the vibration and noise of the U-shaped beam, improve the durability of the bolts of auxiliary components such as sound barriers and contact networks installed on the U-beam, and reduce the workload of operation and maintenance.

The split bolt is used for tensioning the two sides of a concrete wall forming formwork and comprises a threaded rod penetrating through the formworks on the two sides and further comprises a conical cavity arranged outside the threaded rod in a sleeving mode, the threaded rod is provided with a supporting piece for supporting the inner wall of the conical cavity, and the threaded rod is coaxially supported on the conical cavity through the supporting piece. An originally used PVC sleeve is replaced by a similar conical barrel mold, and the exterior of the mold is made of a high-density polyethylene material, so that the smoothness is improved, and demolding is facilitated. The lining is made of stainless steel, so that the strength is improved. The supporting force of the formwork can be met, meanwhile, demolding is convenient, recycling can be achieved, materials are saved to a greater extent, and cost reduction and efficiency improvement are achieved.

The utility model discloses a kind of color coating decorative aluminium profile, it is related to aluminium profile technical field, including aluminium profile assembly, aluminium profile assembly includes middle part support cylinder and reinforcing frame, the outside of middle part support cylinder is fixedly connected with first reinforcing rib, in the utility model, external load is first acted on reinforcing frame, pass through compression strip and is transferred to compression frame, and concentrated stress is dispersed as annular stress, support strip and connecting frame and support frame cooperate and resist the shear deformation of frame, radial load is obliquely conducted to middle part support cylinder through second reinforcing rib, utilize the torsional advantage of its cylindrical structure and disperse radial force, first reinforcing rib auxiliary converts radial force into annular tension, avoid middle part support cylinder partial compression instability, reinforcing pipe is installed in filling cavity, filling cavity is filled with anti-vibration material, improve axial compression resistance, form three-dimensional stress system, realize the layered transmission and dispersion of force.

A radioactive waste organic phase rectification pretreatment method comprises the following steps that a waste organic phase is conveyed into a mixing and clarifying tank A and a mixing and clarifying tank B through a waste organic phase metering pump, deionized water is conveyed into the mixing and clarifying tank A and the mixing and clarifying tank B through a deionized water tank, and water removal treatment is conducted in the mixing and clarifying tank A and the mixing and clarifying tank B; waste organic phases in the mixing and clarifying tank A and the mixing and clarifying tank B flow into a feeding tank after being pretreated, and water phases flow into an inorganic waste liquid tank.

The utility model relates to the technical field of kitchen cooking utensils, and particularly discloses a vacuum cooking utensil with a good sealing effect, which comprises a pot body, a pot cover and a sealing ring. The pot body comprises a pot body and an inner pot arranged in the pot body, and the opening part of the inner pot is provided with a flange extending outwards; the sealing ring comprises a connecting part and a sealing part connected with the connecting part; the sealing part comprises a first sealing lip and a second sealing lip; the first sealing lip is configured to obliquely extend from the connecting part to the inner side of the sealing ring, and is attached to the part, close to the interior of the inner pot, of the turned-over edge in a cover closing state so as to prevent gas in the inner pot from escaping during positive pressure; and the second sealing lip is configured to obliquely extend from the connecting part to the outer side of the sealing ring, and is attached to the part, far away from the interior of the inner pot, of the flange in a cover closing state so as to prevent external air from entering the internal space of the inner pot under negative pressure. The sealing requirements in two pressure states can be met at the same time, and the problem of unstable pressure caused by gas leakage or external gas entering is solved.

The utility model discloses a fire extinguishing device with a pressure stabilizing structure, which comprises an aerosol fire extinguisher main body, a cooling mechanism is sleeved on the surface of the aerosol fire extinguisher main body, and a mounting mechanism is mounted above the cooling mechanism. The limiting clamping ring is arranged on the surface of the aerosol fire extinguisher body in a sleeving mode, the water storage cover can be installed on the surface of the aerosol fire extinguisher body, the clamping plate is arranged on the surface of the installation stud in a sleeving mode, the clamping plate can be fixedly installed through the limiting nut, at the moment, the clamping plate is clamped with the top end of the aerosol fire extinguisher body, and the water storage cover can be installed on the surface of the aerosol fire extinguisher body. The water storage cover can be conveniently mounted on the surface of the aerosol fire extinguisher main body in a limiting manner, the aerosol fire extinguisher main body can be conveniently cooled by injecting water into the water storage cover, the pressure in the aerosol fire extinguisher main body can be maintained, and unstable pressure caused by temperature rise of the aerosol fire extinguisher main body during storage is avoided.

The invention provides process equipment for non-crimp continuous endless tow phenolic fibers, which comprises a spinning unit, a tow guide unit and a tow collecting unit, the spinning unit comprises a double-screw mechanism, a gear pump and a spinneret plate, the gear pump is arranged between the double-screw mechanism and the spinneret plate, the tow guide unit comprises a plurality of tow guide rollers and an oiling agent tank, the oiling agent tank is arranged in the spinning unit, and the oiling agent tank is arranged in the spinning unit. The oiling agent tank is arranged between two adjacent godets, the silk collecting unit comprises a tension roller and a silk collecting roller, and the tension roller is arranged between the godets and the silk collecting roller. The mixing effect and stability of raw material melting can be improved through the double-screw mechanism in the process equipment, the flexibility of phenolic resin precursor bundles can be improved through the oiling agent tank, and the continuity and uniformity of the phenolic resin precursor bundles can be guaranteed through cooperation of the gear pump and the tension roller; the combination of the tension roller and the take-up roller can avoid fluctuation and instability of take-up of a take-up gun in related technologies. The invention further discloses the non-crimp continuous endless tow phenolic fiber and a preparation method and application thereof.

The utility model discloses a kind of oilfield operation pneumatic pressure testing device, it includes main support, pressure generation module and pressure transmission component.Pressure generation module generates pressure by air cylinder, piston and driving rod, pressure transmission component is composed of gas holder, pressure regulating valve and output connector, realize pressure storage and regulation.Gas holder is equipped with partition and spring type check valve, prevent overpressure;Output connector uses corrosion-resistant coating and sealing ring to enhance the reliability of connection.The bottom of main support is equipped with supporting foot and non-slip mat, improve stability.The device is simple in structure, convenient to operate, can efficiently and stably complete pressure testing task, applicable to complex oilfield environment, significantly improve work efficiency and reduce labor intensity.