99 results about "Annular duct" patented technology

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

The invention relates to an aircraft turbomachine subassembly comprising an annular duct (36) extending concentrically about a longitudinal axis and in which an air stream flows from upstream to downstream, the annular duct comprising a duct portion (28) defining a swan neck having an upstream inlet section and a downstream outlet section. A plurality of radial arms (B1, B2) extend circumferentially in the duct portion (28). One or several intermediate walls (P1, P2) extend between two circumferentially adjacent arms (B1, B2) which form a pair of circumferentially adjacent arms among the plurality of circumferentially adjacent arms so as to locally separate, between the two arms of the pair of arms, the annular duct portion (28) into a radially inner portion (Ci) and a radially outer portion (Ce) further away from the longitudinal axis than the radially inner portion.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

Aircraft turbine engine including two coaxial annular walls defining between them a main annular duct for the flow of a primary airflow; —a rotor blading extending radially through the first duct; —an annular separator arranged downstream of the rotor blading and configured to divide the primary airflow into two to form the secondary air flows; —first variable guide vanes which are distributed around the shaft and each comprise a leading edge which is located upstream of the separator and trailing edges which are located in the secondary airflows; —and fixed guide vanes which are distributed around the shaft in the external airflow and downstream of the first variable vanes.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

The invention discloses a directional heat dissipation power distribution cabinet with adjustable air deflectors, which relates to the technical field of equipment for power distribution cabinets and comprises a cabinet body and a heat dissipation unit arranged in the cabinet body. The heat dissipation unit comprises a directional heat dissipation assembly used for carrying out fixed-point jet cooling on key heating elements, an air guide assembly used for optimizing overall airflow organization in the cabinet, and a water cooling assembly used for carrying out pre-cooling on cooling airflow of the directional heat dissipation assembly. The directional heat dissipation assembly comprises a fan at least arranged on the top wall in the cabinet body, an air supply pipe communicated with an outlet of the fan, and an annular air pipe arranged in the power distribution cabinet and communicated with the air supply pipe. Through cooperation of the directional heat dissipation assembly and the water cooling assembly, air blown out of the air blowing pipe at the tail end of the telescopic air column is no longer ambient temperature air but low-temperature cold air cooled in advance through the liquid cooling system. According to the pre-cooling type directional air supply mechanism, the heat dissipation efficiency and the limit capacity of air cooling are greatly improved.

The utility model relates to a fiber fabric air pipe which comprises a glass fiber cloth body, sewing edges are arranged on the two opposite sides of the glass fiber cloth body, and the sewing edges on the two sides of the glass fiber cloth body are mutually sewn, so that the glass fiber cloth body is sewn to form an annular air pipe body; the suspension parts are sewn on the outer surface of the glass fiber cloth body, and the suspension parts and the sewing edges are arranged at intervals in the circumferential direction of the annular air pipe body. The fiber fabric air pipe meets the fireproof requirement by adopting the glass fiber cloth body, and meanwhile, the hanging piece is sewn on the surface of the complete glass fiber cloth body instead of the seam between the two sewn edges, so that even if the fiber fabric air pipe adopts the glass fiber cloth, the hanging piece can bear large tension, and the service life of the fiber fabric air pipe is prolonged. The technical problems that the hanging hook is prone to falling off from the sewing position of the first fiber fabric and the second fiber fabric, and quality and safety accidents are caused are solved.

The utility model discloses a pipeline cleaning device for powder production, which relates to the technical field of powder production, and comprises a bottom plate, one side of the top end of the bottom plate is connected with a side plate, one side of the side plate is connected with two electric push rods, the telescopic ends of the two electric push rods are connected with a moving plate, and the middle of one side of the moving plate is rotatably connected with a rotating shaft through a bearing. One end of the rotating shaft is connected with a scraper through a mounting mechanism, one side of the scraper is provided with an annular air pipe, and the outer side of the annular air pipe is connected with an air blowing pipe; the pipeline cleaning device has the advantages that the electric push rod is matched with the moving plate, extending cleaning can be conducted according to the length of a pipeline, the rotating shaft is matched with the scraping plate, the scraping plate is driven to move after cleaning, water drops on the inner wall of the pipeline are scraped off, water in the pipeline is reduced, the annular air pipe is matched with the air blowing pipe, the pipeline is rapidly dried, and the cleaning efficiency is improved. The powder is prevented from being adhered to the inner wall of the pipeline, and the powder can be quickly conveyed.

To provide a coke dry extinguishment facility and a sloping flue part structure capable of promoting discharge of red-hot coke from a sloping flue part.SOLUTION: A coke dry extinguishment facility comprises a cooling tower including a spare room, a cooling chamber, an annular duct, and a sloping flue part. The sloping flue part includes an annular wall extending upward from an upper end part of the cooling chamber so as to surround a lower end part of the spare room from outside, and a plurality of support walls extending in a radial direction of the cooling chamber between the lower end part of the spare room and the upper end part of the cooling chamber and the annular wall and arranged in a circumferential direction of the cooling chamber. The inner peripheral surface of the annular wall includes an inclined surface expanding outward in the radial direction of the cooling chamber as it goes upward. In a vertical cross-section including one of the support walls, a first intersection at which the inclined surface intersects with an inner peripheral surface of the cooling chamber is located above a second intersection at which a lower end of the one support wall intersects with the inner peripheral surface of the cooling chamber.SELECTED DRAWING: Figure 3

The invention relates to a marine energy-saving duct fin with a bionic trailing edge, comprising: an annular duct, the outer edge of which is fixed to the tail of a hull; the multiple fins are evenly distributed in the circumferential direction of the annular guide pipe, and the tail edge of each fin is provided with a bionic zigzag structure; the bionic zigzag structure is composed of tooth peaks and tooth valleys which are arranged periodically, and the height of each sawtooth and the distance between the tooth peaks are different and change randomly within the coverage range. The height difference between the adjacent tooth peaks and tooth valleys does not exceed 1 / 30 of the maximum chord length of the fin blades, and the distance between the adjacent tooth peaks or tooth valleys does not exceed 1 / 30 of the extension length of the fin blades. According to the marine energy-saving duct fin with the bionic trailing edge, the energy-saving effect can be effectively improved, and the vibration and noise reduction effect is enhanced.

A burner includes a central conduit; a first annular pipe; and a nozzle plate across an outlet of the first annular duct, wherein the nozzle plate includes a plurality of orifices extending through the nozzle plate; and a second annular conduit leading to a downstream space wherein the central conduit and the first annular conduit are controllably connected to a first reactant and the second annular conduit is controllably connected to a source of a second reactant wherein one of the first reactant and the second reactant comprises a fuel, and the other of the first reactant and the second reactant includes oxygen. The combustion device comprises a plurality of such combustors, preferably arranged in two planes, where each plane contains at least one such combustor. A fuel-rich flame may be emitted in one of the planes and a fuel-lean flame may be emitted in the other plane. The rich and lean fuel properties of the flames emitted in the respective planes may periodically alternate.

The utility model discloses an annular exhaust device for a pit type heat treatment furnace. The annular exhaust device comprises an exhaust pipeline arranged on a furnace cover, the exhaust pipeline comprises an annular air pipe, an exhaust main pipe rotating section and an exhaust main pipe fixing section which are communicated in sequence; a main support fixed to the ground is arranged on one side of the exhaust pipeline, and the top of the main support supports the exhaust main pipe fixing section. The exhaust main pipe rotating section is connected with the main support through a first rotating connecting mechanism. An air pipe header is arranged between the annular air pipe and the rotating section of the exhaust main pipe, and the air pipe header is connected with the main support through a second rotating connecting mechanism; and the rotating center of the first rotary connecting mechanism, the rotating center of the second rotary connecting mechanism and the rotating shaft of the furnace cover are coaxially arranged. According to the utility model, through symmetrical shunting of the annular air pipe and the rotary connecting mechanism, the exhaust efficiency is improved, the maintenance period is prolonged, the operation process is simplified, and the stability in the synchronous rotating process of the exhaust pipeline and the furnace cover is improved.

The invention provides a flow control device and method for improving the propulsion efficiency of a ducted fan. The flow control device comprises a duct and a duct propeller device. The annular duct is arranged on the periphery of the duct propeller device; the duct comprises an air blowing flow channel, an air blowing port, an air suction port, an air suction flow channel and an air source device; the air blowing opening is formed in the position, close to the front edge of the duct airfoil profile, of the inner surface of the duct, namely the upper surface of the duct airfoil profile; the air suction port is formed in the position, away from the front edge of the duct airfoil profile, of the upper surface of the duct airfoil profile of the duct; according to the invention, collaborative jet active flow control is introduced to the ducted fan, so that the overall propulsion efficiency of the ducted fan is greatly improved, meanwhile, the wind resistance characteristic of the ducted fan is improved, and the controllability of the ducted fan is enhanced.

The invention discloses a low-altitude high-speed flight manned flying saucer, and relates to the technical field of aviation aircrafts, the low-altitude high-speed flight manned flying saucer comprises a saucer-shaped body, a power device and an undercarriage, the saucer-shaped body is composed of a central bearing ball cabin and a peripheral reinforcing ring coaxially sleeved outside the central bearing ball cabin; the central bearing ball cabin is divided into a celestial navigation and communication cabin, a panoramic cockpit and an environment control and life support system cabin from top to bottom; the inner cabin section of the peripheral reinforcing ring forms a passenger cabin; the bearing strength and the space utilization rate of the machine body are effectively improved through the composite structure of the central spherical cabin and the peripheral reinforcing ring; due to the integrated design of the annular duct and the vector engine, the aerodynamic efficiency and the control flexibility in the vertical take-off and landing and high-speed flight states are remarkably improved; an independent environment control system ensures the safety and comfort of passengers in high-altitude flight; the overall layout gives consideration to functionality and maintenance convenience, and has high practical value.

Aircraft turbine engine including two coaxial annular walls defining between them a main annular duct for the flow of a primary airflow; a rotor blading extending radially through the first duct; an annular separator arranged downstream of the rotor blading and configured to divide the primary airflow into two to form the secondary air flows; first variable guide vanes which are distributed around the shaft and each comprise a leading edge which is located upstream of the separator and trailing edges which are located in the secondary airflows; and fixed guide vanes which are distributed around the shaft in the external airflow and downstream of the first variable vanes.

A heat exchanger positioned within an annular duct of a gas turbine engine is provided. The heat exchanger extends substantially continuously along the circumferential direction and defining a heat exchanger height equal to at least 10% of a duct height. An effective transmission loss (ETL) for the heat exchanger positioned within the annular duct is between 5 decibels and 1 decibels for an operating condition of the gas turbine engine. The heat exchanger includes a heat transfer section defining an acoustic length (Li), and wherein an Operational Acoustic Reduction Ratio (OARR) is greater than or equal to 0.75 to achieve the ETL at the operating condition.

A dual-premixed ammonia burner relates to the field of ammonia combustion equipment. Addressing the problems of high ignition energy, slow combustion speed, poor flame stability, and difficulty in achieving stable combustion in large proportions with ammonia, this invention employs a dual premixing structure of auxiliary fuel gas premixed with ammonia and air premixed with ammonia, combined with a three-stage coaxial air duct and a regenerative pre-combustion chamber to achieve stable combustion. The burner includes an ignition gun, a primary air regulating damper, a secondary air regulating damper, a volute-shaped air casing, a primary air annular duct, swirl vanes, an annular ammonia multi-nozzle header, a pre-combustion chamber, a tertiary air multi-nozzle annular pipe, a flame monitor, and dual ammonia and auxiliary fuel inlets. This invention allows for wide load adjustment from 30% to 100%, no flameout at low loads, high burnout rate, and low nitrogen oxide emissions. It can operate with a large proportion of ammonia or pure gas, features a reasonable structure, reliable ignition, and stable safety, and is suitable for zero-carbon retrofitting and efficient utilization of green ammonia in industrial boilers, kilns, and other thermal equipment.

The invention relates to an accessory gearbox (1) for an aircraft turbine engine, the gearbox (1) comprising a casing (2) that houses an internal air / oil separator (3) comprising a centrifugal separator cassette (30) arranged around a hollow shaft (31) driven in rotation by a drive pinion (38), and an external air / oil separator (4) comprising an external chamber (40) secured to the outside of the casing and housing an air-extraction pipe (41) having an open inlet end (43) fitted with a centrifugal separator dome (45) defining an annular duct (46) in which a filter (47) is positioned; wherein the hollow shaft passes through the casing so as to be rotatably coupled to the centrifugal separator dome and to open into the interior of the air-extraction pipe, thereby placing the interior of the hollow shaft in communication with the interior of the air-extraction pipe.

A system (100) includes a compressor (200). The compressor (200) has a center body (202) and an end cap (212, 213) coupled to the center body (202) at a connection interface (214, 215). The system (100) also includes a sealing system (216). The sealing system (216) includes an annular duct (218, 219) circumferentially extending along a connection interface (214, 215) between the center body (202) and the end cap (212, 213). The sealing system (216) also includes a conduit (220, 221) coupled to the annular duct (218, 219). The system (100) further includes a vacuum source (222) in fluid communication with the annular duct (218, 219) via the conduit (220, 221). In an operational state of the vacuum source (222), the vacuum source (222) is configured to generate a vacuum in the annular duct (218, 219) to direct gases leaking through the connection interface (214, 215) in the annular duct (218, 219).

The utility model relates to the technical field of powder conveying devices, and discloses a powder conveying device for conveying fine particle powder, which comprises a storage bin and a feed port arranged at the top end of the storage bin, and further comprises a spiral powder conveying mechanism fixedly arranged at the discharge end of the storage bin, a dispersion mechanism is arranged at the other end of the discharging pipe and comprises a dispersion bin and an annular air pipe arranged on the outer side of the dispersion bin in a surrounding manner; a dispersion mechanism is arranged in the dispersion bin, and the dispersion mechanism comprises a fixed part fixedly arranged in the dispersion bin; the bottom of the dispersion bin is fixedly connected with a powder outlet pipe, and the bottom end of the powder outlet pipe is fixedly connected with a venturi pipe. According to the powder feeding device for conveying the fine-particle powder, the conveyed powder can be ground and dispersed, powder caking is avoided, the dispersion effect of the fine-particle powder is improved, and the effect of promoting uniform output of the fine-particle powder is achieved.

An apparatus to remove a coating from an edge of a substrate includes a vacuum chuck assembly and a nozzle assembly. The vacuum chuck assembly is configured to support the substrate using suction. The nozzle assembly includes a nozzle head with a pair of nozzle tips configured to direct an angled liquid stream on a surface of the substrate. An annular duct around each nozzle tip discharges a pressurized gas to form a gas shroud around the angled liquid stream.

The utility model relates to the technical field of granulators, discloses a cooling structure of a granulator, and solves the problem that the cooling structure is lack of treatment on waste gas generated by cooling. Through the preliminary filter screen, the high-efficiency filter screen, the activated carbon filter screen and the fan, large-particle impurities in gas after particulate matters are in contact with cooling water are removed through the preliminary filter screen, then the gas passes through the high-efficiency filter screen which is an HEPA filter screen, fine particulate matters and harmful substances are further filtered, and finally the gas is discharged through the activated carbon filter screen. The activated carbon filter screen adsorbs peculiar smell and organic pollutants in gas, the cleaned gas is discharged from the air outlet, the annular air pipe and the air outlet holes are arranged on the upper surface of the box body, and the annular air pipe is communicated with the fan, so that gas flow can be increased, and the cleaning effect is improved; and the annular baffle is in threaded connection with the supporting column through the bolt, so that subsequent disassembly and cleaning are facilitated.

The invention discloses a guide rope traction type shield segment bag grouting method which comprises the following steps: S1, constructing an annular segment: constructing on the inner wall of a tunnel to form the annular segment, separately forming a first grouting hole and a second grouting hole in the bottom of the annular segment, arranging a traction rope on the periphery of the annular segment, the two ends of the traction cable penetrate through the first grouting hole and the second grouting hole correspondingly to stretch into the annular pipe piece. S2, real-time detection: arranging an endoscope on a traction cable in the annular duct piece, pulling the traction cable to enable the endoscope to penetrate through the first grouting hole to enter the space between the annular duct piece and the inner wall of the tunnel, and moving along the circumferential direction of the annular duct piece to detect the disengagement position of the inner wall of the tunnel and the non-dense grouting position of the shield tail behind the annular duct piece; the endoscope penetrates through the second grouting hole and returns to the interior of the annular pipe piece; s3, a grouting bag is arranged in a pulling mode; and S4, grouting is conducted. According to the guide rope traction type shield segment bag grouting method, the real situation can be accurately detected, the grouting and filling effect is good, the construction cost is reduced, and the construction efficiency is improved.

The utility model discloses a copper-clad aluminum rod single-pulling device which comprises supporting legs, a workbench, a longitudinal carrier roller, a transverse carrier roller, a roller frame, a mold, an installation base, a single-pulling roller, an anti-skid layer, a single-pulling motor, an air compressor body, a dust remover body, a copper-clad aluminum rod, a dust blowing cleaning box structure, an electric cutting box structure and a convenient-to-clean waste chip collecting box structure. The multiple supporting legs are connected to the four corners of the lower end of the workbench through bolts correspondingly. A waste opening is formed in the right side of the middle part in the workbench; the two longitudinal carrier rollers are coupled to the front side and the rear side of the left side of the upper end of the workbench correspondingly. And the two transverse carrier rollers are respectively coupled to the middle upper side and the middle lower side between the two roller frames. Through the arrangement of the annular air pipe, the dust blowing box, the supporting rod, the annular cleaning sponge, the air blowing opening, the quick connector and the air compressor body, the function of cleaning dust on the outer wall of the copper-clad aluminum rod is achieved.

The utility model relates to an anti-blocking feeding hopper for a coal feeder. The device comprises a feeding hopper, an annular air pipe, air inlet nozzles, a main air pipe, a valve and an air heater, the feeding hopper is fixedly installed at the feeding end of the coal feeder, the annular air pipe is installed at the bottom of the feeding hopper, the air inlet nozzles are evenly arranged on the annular air pipe and extend into the hopper after penetrating through the feeding hopper, one end of the main air pipe is communicated with the annular air pipe, and the other end of the main air pipe is communicated with the valve. The other end of the main air pipe is connected with an air heater, and a valve is further installed on the main air pipe. According to the scheme, the feeding hopper can be heated through hot air, the temperature of a coal mine in the feeding hopper is increased, the freezing and sticking phenomenon is avoided, and therefore the smoothness of the feeding hopper is guaranteed.