31results about How to "Small sectional area" patented technology

A ceramic heater in which a damage in a joining portion between a heating portion and a lead portion is suppressed and the reliability is excellent is provided.In a ceramic heater (1) including: a rod-shaped support (2) which is made from an insulative ceramic; and a resistor member (3) including a heating portion (31) embedded in a tip end part of the support (2), and a pair of lead portions (33) which extend from the heating portion (31) toward a rear end side of the support (2), the heating portion (31) and the lead portions (33) are made from the same conductive ceramic.

A skateboard assembly and a skateboard having the same are provided. The skateboard assembly includes a truck and a frame. The truck includes a pivot that has two oppositely extending axial sections, and the frame includes a pivot hole, and a first segment and a second segment extending at two sides of the pivot hole, wherein the first segment and the second segment include an angle and each of the first and second segments has an end far from the pivot hole provided with an axle.

A dialyzer including a substantially cylindrical case 2, a hollow fiber bundle 3 made of a plurality of hollow fiber membranes provided in the case 2, a blood flow path formed by lumens of the hollow fiber membranes, a dialysate flow path formed by a gap between the inner wall of the case 2 and the hollow fiber membranes, and a cylindrical elastic tube 4 inserted in the gap between the inner wall of the case 2 and the hollow fiber bundle 3.

A connecting terminal includes an external terminal connecting portion, having an end surface to connect an external terminal thereto and located at a second principal surface side of a second circuit board faces, and a substrate-fixed portion which is securely connected to a first circuit board. A seal attachment portion is provided on a portion of the external terminal connecting portion including the end surface to attach thereto a seal member to seal a gap between the portion and the case. The connecting terminal includes a reduced sectional area portion having a sectional area smaller than an area of the top end surface in a region close to a plurality of electronic components arranged on the second circuit board on the external terminal connecting portion. The reduced sectional area portion is provided from the seal attachment portion to an end in the opposite side of the end surface.

To provide a muffler for a compact combustion engine, which is simple in structure and effective to sufficiently reduce the temperature of exhaust gases while avoiding contact with an external air, an exhaust guide passage 7 for communicating the exhaust gases (G) to a discharge port (63) is provided within an interior hollow of a muffler housing 6 defining an exhaust chamber (61) therein, and a side wall of this exhaust guide passage (7) is constituted by a portion (6W) of the muffler housing (6) and a duct wall (71) jointed to the muffler housing (6).

A spark plug comprising a center electrode, a first noble metal tip joined to the center electrode, an insulator, a metallic shell, a ground electrode joined to the metallic shell and including an outer layer and an inner layer, and a second noble metal tip joined to the ground electrode by way of a melted portion, wherein in a cross section of the ground electrode, the protrusion height A of the second noble metal tip is 0.4mm or more, the ground electrode includes a substantially flat joining surface to which the second noble metal tip is joined and an outwardly curved surface, the inner layer has at the joining surface side a substantially flat surface or recessed surface, and the minimum distance F between the melted portion and the inner layer is 0.1mm or more.

Means of solution: Optical protrusions 23 of nano-size for restricting reflection of light and protection columns 24 for preventing crushing of the optical protrusions 23 are provided on a surface of a film substrate 22. The protection columns 24 have a frustum shape. When a ratio of a projection area in which all of lateral surfaces of a single protection column 24 are projected on a surface of the film substrate 22 from a direction that is perpendicular to the surface of the film substrate 22 to a divided area on the surface of the film substrate 22 with respect to the single protection column 24 is defined to be a lateral surface projection occupying area rate, the lateral surface projection occupying area rate of the antireflection film is not more than 0.25% and not less than 0.01%.

The invention discloses a square pipe fan convenient for engine cooling, and relates to a fan. The square pipe fan comprises an engine, a bracket, a blade and a square pipe type shell. An output shaft of the engine and an opening direction of the square pipe type shell are formed to an acute angle. A rotating plane of the blade is perpendicular to the output shaft of the engine, and is formed to an acute angle with the opening direction of the square pipe type shell. The inner periphery of the cross section of the square pipe type shell is rectangular; the length of the rectangle is slightly greater than the maximal outer diameter of the blade rotating along with the output shaft of the engine; and the width of the rectangle is slightly greater than a product between the maximal outer diameter of the blade rotating along with the output shaft of the engine and the sine of the acute angle formed by the rotating plane of the blade and the opening direction of the square pipe type shell. A rotating center of the blade is positioned on a geometric center line of the opening direction of the square pipe type shell. The engine is positioned at the downstream of an air flow. Compared with a traditional axial flow fan, the square pipe fan is much smaller in section under the condition of equal flow, so that the square pipe fan is convenient to be installed in a narrow space.

A two-stage propeller for ships relates to a ship propeller, which comprises a front engine, a rear engine, a front propeller, a rear propeller and a square tube casing. The front propeller is mounted on the output shaft of the front engine, and the rear propeller is mounted on the output shaft of the rear engine. The diameters of the front propeller and the rear propeller are equal, and they are arranged inside the square tube shell one after the other. The forward angle between the rotation plane of the front propeller and the left plate of the square tubular shell is no more than 80°. The rearward angle between the rotation plane of the rear propeller and the left plate of the square tubular shell is no more than 80°. The planes of rotation of both the front and rear propellers are perpendicular to the top and bottom plates of the square tubular housing. Driven by the front engine and the rear engine respectively, the front propeller and the rear propeller rotate in the square tubular shell, sucking the water in the front into the square tubular shell and extruding it from the rear of the square tubular shell. Compared with traditional ship propellers, it has large thrust, low resistance and high efficiency.

The present invention discloses a design method of broad base low-vacuum practial weir. Said invention includes system design mentality, weir surface curve design, flood carrying capacity calculation method, finite element stress check calculation and technical economic comparison of new weir type and WES weir. The most key of said design includes three factors of flood carrying capacity, weir surface pressure and volume of dam body, and its concrete design calculation method includes two portions of body type designand discharge coefficient definition.

A ship propeller with a square tube propeller relates to a ship propeller, which includes an engine, a propeller and a square tube casing. The engine is mounted on the outside of the square tube casing through brackets. The rotation plane of the propeller is perpendicular to the output shaft of the engine, and the rotation plane of the propeller forms an acute angle with the opening direction of the square tubular shell. The section of the propeller is airfoil. The inner circumference of the cross-section of the square tubular shell is rectangular, the length of the rectangle is slightly greater than the maximum outer diameter of the propeller, and the width of the rectangle is slightly greater than the maximum external diameter of the propeller, the rotation plane of the propeller and the opening direction of the square tubular shell. The product of the sines of the acute angles formed. The propeller is completely inside the square tube housing. The propeller can rotate flexibly in the square tubular casing. Compared with the traditional ship propeller, the cross-sectional area of ​​the propeller of the present invention is much smaller when the flow rate is the same, and the efficiency is high and the resistance is small.

A square-tube fan relates to a fan, which includes a motor, a bracket, fan blades, a square-tube casing and a guide vane. The engine is mounted inside the square tubular casing with brackets. The square tubular shell is surrounded by four flat plates. The rotation plane of the fan blade is perpendicular to the two parallel flat plates of the square tube-shaped casing, and the rotation plane of the fan blade forms an acute angle with the other two parallel flat plates of the square tube-shaped casing. The engine is upstream in the airflow. The deflector is installed at the outlet of the square tube housing. Compared with the traditional axial flow fan, the cross-sectional area of ​​the fan of the present invention is much smaller when the flow rate is the same, and it is convenient to be installed in a narrow space.