33results about How to "Reduce airflow loss" patented technology

The invention discloses a cooling air channel assembly for a universal gasoline engine. The cooling air channel assembly comprises a fan cover and a flow guide cover. The flow guide cover and the fan cover are matched with each other in an insertion manner and are used for forming cooling air channels for cooling an engine head of the universal gasoline engine. The cooling air channel assembly has the advantages that the flow guide cover and the fan cover are matched with each other in the insertion manner, so that various components can be closely matched with one another, the airtight property of cooling spaces can be improved, air flow loss in the cooling spaces can be reduced to the greatest extent, radiating effects can be guaranteed, and the cooling air channel assembly is compact in integral structure; the cooling air channel assembly with the structure is easy to implement, detach, mount and maintain and convenient to operate, and is changeable.

The invention discloses an outer cover component for a forced cooling ventilator. The outer cover component for the forced cooling ventilator comprises a fan cover and an air director component which is tightly adhered to the circumferential edge of the fan cover to form a through airtight air channel for cooling air circulation; because the air director component is tightly adhered to the circumferential edge of the fan cover to form the airtight through cooling space, the leakproofness of the whole cooling space is greatly improved, and the airflow loss in the cooling space is reduced so as to ensure the cooling effect; in addition, because of the airtight adhering structure of the fan cover and the air director component, the whole structure is more compact, and the space is saved.

The invention belongs to the field of agricultural machinery and relates to a uniform and low-loss air path system and an air flow organization method for a pneumatic seeder. The airflow enters the air inlet pipe (13) of the airflow distributor (1), passes through the reducing joint (12), and is divided into multiple airflow paths with the same size by multiple air outlet pipes (15) evenly distributed on the distributor circular plate (11). The airflow then enters the seeding pipe (4) through the pneumatic seeding device (3). Every time it drops to a certain height, the airflow is gradually discharged from the air vents (41) evenly arranged on the body of the seeding pipe (4), and the seeding pipe (4) The air flow pressure in 4) gradually decreases, and the speed of the seeds falling with the air flow decreases significantly, and is finally discharged from the seed discharging pipe outlet (42). The uniform and low-loss air path system of the pneumatic seeder of the present invention can effectively make the air supply pressure of the individual seed metering devices consistent for each row of seeding, reduce the power demand of the fan by reducing the loss caused by the gas distribution process, and at the same time increase the leakage of the seed metering process. The pressure significantly reduces the seeding speed of the pneumatic seed metering device.

The invention relates to the technical field of aeroturbine engines, in particular to a dual-flow-pass fan guide vane adjusting mechanism. The mechanism is characterized by comprising an acting barrelarranged on an outer casing of an engine, an acting ring is connected with the acting barrel, the acting ring is connected with a dual-flow-pass fan guide vane rotating shaft through a connection rodmechanism, the dual-flow-pass fan guide vane rotating shaft is arranged on the outer casing, dual-flow-pass fan guide vanes are installed on the dual-flow-pass fan guide vane rotating shaft, and theacting barrel drives the acting ring to drive the connection rod mechanism to enable the dual-flow-pass fan guide vane rotating shaft to be rotated so as to rotate the dual-flow-pass fan guide vanes.The fan guide vanes are placed in a regular polygon inner casing annular cavity, interference produced between the fan guide vanes and the inner and outer casings in large-angle range adjustment is avoided, a flow pass can be completely blocked and closed in the 90-degree position, and airflow loss caused by gaps is reduced.

The invention discloses a general gasoline engine, which comprises a general gasoline engine box body, two general gasoline engine cylinder heads and an upper air passage assembly, wherein the two general gasoline engine cylinder heads are connected with the general gasoline engine box body, the upper air passage assembly surrounds the outside of the general gasoline engine cylinder heads, and comprises a fan cover and a flow guide cover, and the flow guide cover and the fan cover are matched in an inserting connection mode and are used for forming a cooling air passage through which cooling air flows between the two general gasoline engine cylinder heads. Through the inserting and connecting type matching between the flow guide cover and the fan cover, the matching among all components is tighter, the sealing performance of the cooling space is improved, the airflow loss in the cooling space is reduced to the greatest degree, the heat radiation effect is ensured, and the integral structure is compact; in addition, the realization of the structure is simple, the operation is convenient, the dismounting, the mounting and the maintenance are easy, and the replacement is easy.

The invention provides a gas-gas mixing flame stabilizing device, and relates to the technical field of engines; the gas-gas mixing flame stabilizing device comprises a beveling type lobed mixer and acover plate; the beveling type lobed mixer is of a hollow conical columnar structure with openings in two axial ends; the cover plate is of a plate-type structure with an indent section; the inlet end of the beveling type lobed mixer is connected with the outlet end of an external turbine; the shape of the indent face of the cover plate is consistent with the shape of the beveling type lobed mixer; the indent face of the cover plate is fixedly installed on the outlet end face of the beveling type lobed mixer correspondingly; the convex face of the cover plate is in butt joint with the inlet end of an external combustion chamber; the cover plate is of a petal-like structure, and comprises a center plate and n lobes; the center plate is of a circular plate-type structure; and the n lobes are uniformly distributed at the side position of the center plate annularly; and the n is a positive integer between 12-24. The gas-gas mixing flame stabilizing device is simple and reliable in structure and light in weight, and high-efficiency mixed combustion of inner duct fuel-rich gas and outer duct air can be achieved under the condition that the pressure loss is lower (the total pressure recovery coefficient of the fuel-rich gas in the mixer is not less than 0.80).

The invention relates to a ventilation and cooling device for an AC motor, which includes a cooling backpack fan, an air duct soft joint and an air duct air collection interface; the cooling backpack fan includes a fan casing, a fan motor installed on the fan casing, and a fan motor installed on the fan casing The inner centrifugal impeller, arc-shaped air collector and air cooling backpack; the centrifugal impeller is installed on the output shaft of the fan motor, the arc-shaped air collector is set on the centrifugal impeller, and the air-cooling backpack is in contact with the arc-shaped collector. The wind device is installed on the outer wall of the air inlet end of the fan casing, the air collection interface of the air duct is installed on the air outlet port of the fan casing, one end of the air duct soft joint is installed on the air collection interface of the air duct, and the other end Connect with the case. The ventilation and cooling device of the AC motor of the present invention can make the temperature rise of the AC motor normal and its winding insulation stable, effectively prevent the insulating material from aging and becoming brittle, prolong the service life of the motor, and the ventilation and cooling device is easy to install, and the ventilation effect is good and stable. High durability and easy maintenance.

The invention discloses a ventilating machine provided with a tight fitting type fan cover. The ventilating machine comprises a ventilating machine box body and two side cylinder heads connected with the ventilating machine box body and further comprises the fan cover and an air guide cover module penetrating through an airtight air channel and used for cooling the ventilating machine box body and the two side cylinder heads. Due to the fact that the edge peripheries of the air guide cover module and the fan cover form an airtight through cooling space through right fitting, the leakproofness of the whole cooling space is greatly improved, air flow loss in the cooling space is reduced, and heat dissipation effect is ensured. In addition, in the mode that the fan cover and the air guide cover module form the tight fitting structure, the ventilating machine is more compact in overall structure and capable of saving space.

The invention discloses a semi-open centripetal turbine and a gas turbine, which comprise a hub, a disc and blades, the disc is arranged at one end of the hub, the blades are arranged between the hub and the disc, and two adjacent blades form a The turbine airflow passage, the wheel disc includes a wheel back arranged on the hub along the radial direction of the hub, the wheel back is arranged symmetrically along the central axis, a plurality of wheel backs are arranged at intervals along the circumference of the hub, and the wheel backs and blades are arranged in one-to-one correspondence , the wheel back includes a cross-section gradually expanding section, a constant section section and a section tapering section arranged and connected in sequence along the radial direction of the wheel disc. The scraping area dominated by the viscous force at the end blocks the leakage flow dominated by the differential pressure force through the equal section section, thereby reducing the leakage loss of the wheel back. The semi-open centripetal turbine of the present invention has small leakage flow loss and improves the performance and reliability of the semi-open centripetal turbine.