41results about How to "Large amount of expansion" patented technology

An engine cooling system is provided with a cooling circuit including a coolant pump for supplying an engine with a coolant and for circulating the coolant in the cooling circuit, and at least one heat exchanger for cooling said coolant downstream of the engine, wherein an expansion tank is connected to the cooling circuit upstream of the coolant pump. The cooling system is pressurized by a pressure regulating arrangement arranged to pressurize coolant supplied to the cooling circuit from the expansion tank during at least one predetermined operating mode of the engine and the expansion tank is closed to the ambient atmosphere during all normal engine operation modes.

The invention discloses a clamping method applicable to a tensile strength test of a cylindrical part. The method comprises the following steps: A, mounting a wedge-shaped clamping plate in a wedge-shaped opening of a clamping body, connecting two parts of the clamping body through a telescopic structure, inserting a wedge-shaped bayonet and a wedge-shaped clamping plate, mounting an ejector rod above the wedge-shaped clamping plate, and mounting a stop baffle and a tension spring outside the wedge-shaped bayonet and the wedge-shaped clamping plate; B, adjusting the length of the telescopic structure, fixing the telescopic structure, upwards starting the ejector rod, and putting a test piece into the wedge-shaped bayonet; C, pressing the wedge-shaped clamping plate by using the ejector rod, folding the wedge-shaped clamping plate, and driving the wedge-shaped bayonet to clamp the test piece; D, repeating the step C, and clamping the other end of the test piece; E, enabling the wedge-shaped clamping plate to open along two sides of a wedge-shaped included angle beta by the ejector rod, and loosening the test piece by the wedge-shaped bayonet. The wedge-shaped clamping plate has great expansion, the wedge-shaped bayonet has a small lock corner and is convenient to detach and high in self-locking property, and the method is applicable to cylindrical parts of different sizes.

The invention discloses an electric heating device and an assembly process for simulating nuclear reactor fuel rods, comprising a simulated cladding and a simulated fuel element core block, 16 through holes extending along the axial direction are arranged on the simulated fuel element core block. A thermocouple wire positive electrode is installed in some of the through holes, a thermocouple wire negative electrode is installed in some of the through holes, and an inert gas is stored in the remaining through holes; An electric heating rod is installed in the inner cavity; a plurality of external wall temperature thermocouples are installed outside the simulated enclosure. The invention is used for simulating nuclear reaction fuel rods in a laboratory, and carries out experiments on high-temperature degradation and re-flooding behavior experiments of fuel rods used in pressurized water reactors under serious accident conditions. The working medium is water medium, steam medium or inert gas medium, the working pressure is from normal pressure to 5MPa, the long-term working temperature is from normal temperature to 1800°C, and the short-term working temperature is from normal temperature to 2400°C.

The invention relates to a Siemens 9F gas turbine combined cycle unit constant exhaust cylinder temperature clutch engagement control method, comprising the steps of: 1) using SSS clutch engagement between the unit generator and the steam turbine; 2) setting the unit lubricating oil temperature as T, T corresponds to The absolute vacuum degree of the steam turbine is P1, the ambient atmospheric pressure is P0, and before the SSS clutch engages with the steam turbine shaft, the set value of the relative vacuum degree of the steam turbine is P2; Set the relative vacuum to P2. The beneficial effects of the present invention are: the operation method of the present invention is simple and easy to implement, and does not need to make changes to the bearing pad body or the system. There is no need for equipment modification of the gas turbine unit, no additional investment costs, and simple operation. It only needs to properly break the vacuum during the start-up of the unit and increase the expansion of the #8 bearing installed in the condenser to effectively reduce the vibration during the start-up of the unit. So as to ensure the safety and stability of the unit.

The invention discloses a novel expansion bolt. The novel expansion bolt comprises a screw rod and an expansion casing pipe. The screw rod is sleeved with the expansion casing pipe. One end of the screw rod is provided with a thread connected with a nut, and the other end of the screw rod is an expansion cone body. The novel expansion bolt is characterized in that a hollow columnar body is connected with the expansion cone body; a through hole is formed in the axis of the screw rod and communicated with the hollow position of the hollow columnar body; axial strip-shaped holes are formed in the circumference of the side wall of the hollow columnar body; expansion blocks corresponding to all the strip-shaped holes and capable of moving towards the outside of the strip-shaped holes are arranged in the hollow columnar body; a wedge block capable of ejecting the expansion blocks out of the strip-shaped holes is arranged in the hollow columnar body. The novel expansion bolt is of a two-level expansion structure. When the expansion amount of the expansion cone body can not be expanded firmly, the wedge block can be beaten inwards to make the expansion blocks be ejected out of the strip-shaped holes, and the expansion blocks act on the casing pipe. The expansion amount is further increased. Compared with a traditional expansion bolt, the novel expansion bolt is more suitable for modern environment-friendly building blocks of a loose honeycomb structure, concise in structure, obvious in effect and suitable for application and popularization.

The invention discloses a composite internal curing shrinkage-reducing and anti-cracking agent for concrete and a production method thereof, belonging to a concrete additive. In parts by weight, including: modified expansion agent, acrylic modified polypropylene fiber, graphene oxide and polycarboxylate water reducing agent. In the present invention, by using graphene oxide as the adsorption point, acrylic modified polypropylene fiber is adsorbed to form a three-dimensional network dendritic capillary structure, and numerous uniformly distributed micro-reservoirs are formed inside the concrete, so as to promote the cementation material to the greatest extent. hydration reaction, and significantly improve the deformation properties, crack resistance and durability of concrete.

The invention relates to an electronic control aperture plate welding tool and belongs to the technical field of vacuum microwave devices. The welding tool comprises a base, an expansion welding pressing block, a pressing plate, a supporting rack and a control aperture plate. A central hole is formed in the base from the axis to the outside. The supporting rack is arranged in the central hole. A groove used for containing the control aperture plate is formed in the bottom wall of the expansion welding pressing block. The expansion welding pressing block is fixedly arranged on the control aperture plate. The control aperture plate is fixedly arranged on the supporting rack. The pressing plate is fixedly arranged on the expansion welding pressing block. The invention further provides a welding method of the electronic control aperture plate welding tool. For assembling and welding of the control aperture plate in a microwave traveling-wave tube grid-controlled electron gun, the effect that atoms diffuse and infiltrate mutually sufficiently on the contact surfaces between components in the high-temperature vacuum is achieved, and welding between the components is more stable and firmer.

The invention provides a sealing device and a mechanical sealing packer, the sealing device comprises an upper open block, a hydraulic medium, a bimetal convex-concave spring and a lower open block, wherein the bimetal convex-concave spring comprises red copper and a convex-concave spring, the red copper is laid and welded on the surface and the side surface of the convex-concave spring, the bimetal convex-concave spring is arranged vertically, the hydraulic medium is placed in the bimetal convex-concave spring, and the upper open block and the lower open block for extruding and closing the hydraulic medium are respectively connected above and below the hydraulic medium; the mechanical sealing packer is provided with the sealing device; and the sealing device and the mechanical sealing packer provided with the sealing device have the characteristics of high temperature resistance and high pressure resistance, and have very important production practical significance in exploitation process of thick oil.