56results about How to "Sufficient compressive strength" patented technology

The invention provides a compressor which has a sleeve (141), and the sleeve (141) is arranged correspondingly to a through hole (102) of a bending surface (100) which forms a sealed container (12), and is connected with a refrigerant pipe. The sleeve (141) has a small outer diameter part (152), a big outer diameter part (153) and a diameter shrinking part (154) which are arranged in a continuous way through an annular step part (151), the diameter shrinking part (154) takes a capitellate shape at the opening end side of the small outer diameter part (152), a communicating pore (155) which runs through the small outer diameter part (152)and the big outer diameter part (153) has a small inner diameter part (155A) and a big inner diameter part (155C), the small inner diameter part (155A) is mainly arranged at the small outer diameter part (152), the big inner diameter part (155C) is connected with the small inner diameter part (155A) through an annular step part (155B), and is arranged at the big outer diameter part (153), a diameter expanding part (155a), the inner diameter of which gradually increases towards the opening end side, is arranged at the opening end side of the small inner diameter part (155A), and a tube component (145) made of copper is embedded into the big outer diameter part (155C) to be carried out with solder brazing under the state that one end is contacted with the step part (155B), so as to be fixed in the sleeve (141); thus, the compressor which can enable the sleeve arranged in the sealed container through projection welding to be miniature is provided, and the refrigerant pipe and the sleeve are simply connected with a right angle, thereby the sealed container cannot suffer the seat thrust greatly when the sleeve is arranged in the sealed container by welding.

The invention provides a cement-free permeable concrete brick and belongs to the concrete field. Cheap alkaline mud and mineral powder are used to replace cement, the production cost of the permeableconcrete brick can be reduced, the environmental pollution problem caused by the alkaline mud and the mineral powder is solved, and meanwhile, the obtained cement-free permeable concrete brick has large permeation coefficient, good wear resistance and excellent compressive strength. The cement-free permeable concrete brick is prepared from components in parts by weight as follows: 80-100 parts ofthe alkaline mud, 90-110 parts of mineral powder, 90-120 parts of water, 1,400-1,500 parts of stone, 3.4-4.2 parts of crude salt and 1.87-2.31 parts of a high-performance water reducer.

The invention discloses an oil and gas well fracturing construction method. The oil and gas well fracturing construction method adopts a biological junction perforation plugging technology for operation. According to the fracturing construction technology, a biological junction is used for replacing the segmented temporary plugging effect of a bridge plug, the biological junction perforation plugging technology can solve the construction of a casing deformation section and can also be used in a normal whole well section, and meanwhile, the biological junction can also be used for steering in the fracturing process. The environment-friendly biological junction segmented temporary plugging technology is adopted, the bridge plug construction risk is reduced, a reservoir is uniformly fractured, segmented fracturing can be carried out on a casing deformation section, and the influence of casing deformation on the yield of a well is reduced.