38results about How to "Improve the diffusion capacity" patented technology

The invention discloses a pressure expander of a centrifugal compressor. The structure of the pressure expander is improved, and high application value is achieved for further improving working performance of the pressure expander. A short blade is arranged in runners of every two adjacent long blades; the front edges of the long blades are curved surfaces and are arranged obliquely, and the included angles between front edge lines and the central axis of a wheel disc are 6 degrees to 8 degrees; the radius of curvature of the front edges of the long blades is gradually increased from the wheel disc to a wheel cover; each long blade is provided with three broken-line-shaped channels penetrating through a corresponding pressure surface and a corresponding suction surface; tail edge wing tips are arranged on the portions, located on the pressure surfaces, of the rear edges of the long blades. Occurrence of separation of airflow on the surfaces of the blades is restrained through the short blades in the runners of the adjacent long blades; the pressure differences between the pressure surfaces and the suction surfaces are reduced through the broken-line-shaped channels, the adverse pressure gradient is reduced, and separate airflow on boundary layers of the suction surfaces at the tails of part of the blades is effectively blown away; increase of wing tip vortexes generated by the pressure differences between the suction surfaces and the pressure surfaces on the rear edges of traditional wing-type blades can be restrained through parabola-shaped winglets on the tail edges.

The invention relates to the technical field of aircraft gas turbines and discloses a self-adaption compressor for improving flow of a rotor blade tip and a stator angular region. The self-adaption compressor comprises a stator blade, a rotor blade and a casing with a gas introducing circulation cavity. The gas introducing circulation cavity is formed inside the casing and composed of a gas introducing circulation cavity inlet, a high-pressure gas pressure-stabilizing cavity and a main gas introducing pipe. A flexible inlet side wall hinged to the inlet can regulate and control the open degree under the pressure differential effect in a self-adaption mode. The ultimate open degree position of the inlet is restrained by a hydraulically-controlled limiting supporting rod and a check block in the ultimate position of the flexible inlet side wall. The different ultimate open degrees can be set under different work states and are regulated within the open-degree range in a self-adaption mode. Through a self-circulation gas introducing structure, leakage flow of the rotor blade tip of the compressor and separation flow of the stator angular region of the compressor are improved. Through a foreign matter separating device, foreign matter entering the compressor is removed timely, and stable operation of the compressor is guaranteed. Through the high-pressure gas pressure-stabilizing cavity, needed high-pressure gas is provided for an aircraft and an engine.

A centrifugal fluid device and the impeller used therein, the impeller includes a plurality of blades, the blades are backward-curved blades, the starting ends of some or all of the blades are located on a circle with the impeller shaft as the axis and a diameter of D1 , the ends of all the blades are located on a circle with the impeller shaft as the axis and a diameter of D2, wherein, the D1/D2=0.5~0.6; the inlet angle of the inner flow channel of each blade is formed at the beginning of each blade , the inlet angle is the angle between the outer extension line of the blade passing the starting end and the radius of the circle with a diameter D1 passing the starting end, and the value of the inlet angle is 60° to 80°; each of the blades The outlet angle of the inner flow channel of the blade is formed at the end, and the outlet angle is the angle between the outer extension line of the blade passing through the end and the tangent line of a circle with a diameter of D2 passing through the end and following the direction of impeller rotation. The value is from 165° to 175°. The invention can effectively improve the diffusion effect and efficiency of the centrifugal fluid equipment.

The invention discloses a deflector ring for an exhaust hood of a turbine. The deflector ring comprises a flange assembly and a ring plate assembly fixedly connected with the flange assembly. A mounting and fixing spigot connected with the ring plate assembly is formed in the upper surface of the flange assembly, and a steam sealing mounting groove is formed in the inner wall of the flange assembly. The ring plate assembly comprises a skew line ring plate segment, an arc ring plate segment and an orthogonal straight line ring plate segment which are arranged to be of an integral structure. A plurality of supporting rib plates are fixedly connected between the upper surface of the flange assembly and the outer surface of the ring plate assembly, and lifting holes and water tube locating grooves for fixing a water spraying tube are formed in the supporting rib plates. The ring plate assembly is changed to a three-segment type structure with the skew line ring plate segment, the arc ring plate segment and the orthogonal straight line ring plate segment from an original full straight line type structure, so that the stability of a flow field in the diffusion process is guaranteed, and no obvious flow separation or vortex is generated; and the diffusion capacity is improved, and flow losses are reduced.

The invention discloses a guide ring structure of a low-pressure exhaust cylinder of a steam turbine. The guide ring structure of the low-pressure exhaust cylinder of the steam turbine comprises a flared guide ring body. The guide ring body is divided into a top arc section and a bottom arc section in the circumferential direction in the moving sequence of vortexes formed by exhaust steam during acting. The circumferential section of the top arc section of the guide ring body is smaller than the circumferential section of the bottom arc section of the guide ring body. The guide ring body is of a variable cross section structure in the circumferential direction. According to the guide ring structure of the low-pressure exhaust cylinder of the steam turbine, it is ensured that good, orderly and effective control over the vortex moving downwards can be achieved through the back side of the bottom arc section of the guide ring body, namely the top arc section is designed according to the generated top vortex structure and the bottom arc section is designed according to the downward-moving vortex structure on the horizontal plane, so that the main flow diffusion space of the low-pressure exhaust cylinder and the diffusion performance of the whole low-pressure exhaust cylinder are improved, and the total pressure lose can be effectively and reliably reduced; and the guide ring structure of the low-pressure exhaust cylinder of the steam turbine is reliable, economical and practical.

The invention provides a fold-shaped pressure expander which comprises an upper cover plate, a lower cover plate and a folded structure. The fold-shaped structure is in an annular fold belt shape, the upper cover plate and the lower cover plate are of annular-plate-shaped structures, the folded structure is clamped between the upper cover plate and the lower cover plate, air flow channels are formed between the upper cover plate, the lower cover plate and the folded structure, the circulation cross sections of the air flow channels are gradually expanded in the increasing direction of radius, and the pressure of air flow is increased after air flow passes through the air flow channels. The fold-shaped pressure expander is large in air flow channel flow area and small in flowing blockage, efficiency of a compressor is improved, and the thrust-weight ratio is raised; the pressure expander is simple and compact in structure, low in weight, convenient to machine and mount and low in cost, and transformation and upgrading of the compressor are facilitated; the ends of wave crests and wave troughs for forming air flow channel air inlets are of specially-shaped structures, and the pressure expansion effect of the fold-shaped pressure expander is enhanced; rectifier channels are turned back to make air flow direction be converted to the direction of an air inlet of a next grade of an air pressing structure.

The invention discloses a dust removing device of a protective self-propelled straw granulator. The dust removing device comprises a straw channel, and the head end of the straw channel communicates with a cutting device of the protective self-propelled straw granulator. The tail end of the straw channel is inclined upwards and communicates with the inner wall of the top of a diffusion area. The bottom inner wall of the diffusion area communicates with one end of a gravity slope, and the other end of the gravity slope communicates with a straw granulator feeding port of the protective self-propelled straw granulator. The bottom of the diffusion area communicates with the top end of a deceleration area through a dust removing filtering screen, and the bottom end of the deceleration area communicates with a dust discharging channel. According to the dust removing device, based on the gravity sedimentation theory, the incoming speed of straw is reduced through the diffusion area, and thestraw passes through a gravity channel and slides into the feeding port through mass differences and the gravity action; and raising dust low in mass and small in particle passes through the dust removing filtering screen, enters the deceleration area, and is discharged to the ground.

The invention discloses a diffuser suitable for a vane pump. The diffuser is composed of a front cover plate, a rear cover plate and guide vanes which are symmetrically arranged between the front cover plate and the rear cover plate; the front cover plate and the rear cover plate are each of a plane annular structure; isolation plates which are parallel to the planes of the front cover plate and the rear cover plate, crossed with the guide vanes and each of an annular structure are arranged between the front cover plate and the rear cover plate; and the radial length of the isolation plates ofthe annular structure is smaller than the radial length of the front cover plate or the rear cover plate. The inner diameter of the isolating plates is equal to the diameter of inlets of the guide vanes, and the outer diameter of the isolation plates is smaller than the diameter of outlets of the guide vanes. The diffuser structure can effectively improve the flow field distribution of the guidevanes or volutes of the diffuser of the vane pump, increase the flow stability, reduce the energy loss of fluid and improve the overall performance of the vane pump. After test measurement, it is found that the diffuser provided by the invention can improve the diffusion performance by 0.5%-2%, and the energy-saving effect is obvious.