821results about How to "Reduce wind speed" patented technology

A system and method for efficiently capturing electrical energy from a variable-speed generator are disclosed. The system includes a matrix converter using full-bridge, multilevel switch cells, in which semiconductor devices are clamped to a known constant DC voltage of a capacitor. The multilevel matrix converter is capable of generating multilevel voltage wave waveform of arbitrary magnitude and frequencies. The matrix converter can be controlled by using space vector modulation.

The invention relates to a coal seam pre-splitting method based on gas extraction, which adopts a 'CO2 gas extraction device' as a tool to blast and pre-split a pre-mined coal seam, so as to increase the crack of the coal seam, drive out gas absorbed on the coal seam and extract the gas. The method particularly comprises the following steps: drilling a hole on the working surface of a pre-mined coal seam, filling CO2 gas extraction device into the drilled hole, sealing the drilled hole, detonating the CO2 gas extraction device, releasing high-pressure CO2 gas for deep-hole impact and pre-splitting of the coal seam, taking out the CO2 gas extraction device, and connecting the drilled hole with a gas extraction system to extract gas. The pre-splitting method of the invention can greatly enhance the permeability of the coal seam, promote the gas dissociation in the coal seam, and improve the underground gas extraction efficiency of the coal mine.

A method of controlling the speed of rotation of a turbine, the turbine comprising a rotor, the method comprising the steps of measuring or estimating power or torque related to the energy production of the turbine, processing the measured or estimated power or torque so as to obtain a corresponding rotational speed, comparing the obtained rotational speed to a first predefined threshold value and to a second predefined threshold value, the second predefined threshold value being larger than the first predefined threshold value, and controlling the speed of rotation of the rotor according to the obtained rotational speed, so as to obtain a predetermined energy production from the turbine, and in such a way that in case the obtained rotational speed does not exceed the first predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the first predefined threshold value, but does not exceed the second predefined threshold value, the predetermined energy production from the turbine is optimal, in case the obtained rotational speed exceeds the second predefined threshold value, the speed of rotation of the rotor of the turbine is reduced in a predefined manner to a value corresponding to the first predefined threshold value.

Loads reduction method in a wind turbine for power-grid disconnection during a wind gust, which uses a control system made up of three loops used to correct the speed at which the wind turbine blades are moved to the feathered position throughout a controlled emergency stop, with a non-linear law that takes into account blade position, tower vibrations and generator rotation speed limits.

The invention discloses a kiwifruit tree planting method. Connected greenhouses are used for cultivation, greenhouse films and arrangement of the greenhouses are adjusted along with change of seasons, the four-prevention measures including anti-freezing measures taken in winter and spring, rain sheltering and disease preventing measures taken in the rainy season, and cooling and sun blocking measures and windproof measures taken in midsummer are adopted, matched labor-saving tree cultivating management is performed, the capacity for coping with extreme weather in rainy and high-temperature areas in the south is effectively improved, and the high temperature and high humidity disease problem and the like which are difficult to solve in open field cultivation and traditional facility cultivation are solved. Due to the adoption of the method, the kiwifruit disease transmission route can be effectively cut off, input cost is low, manpower is saved, the survival rate of kiwifruit trees reaches 95.2%, the average single weight of red kiwifruits can reach 86 g under the situation that no swelling agents are applied, and the largest single fruit weight reaches 103.5 g; the soluble solid reaches 17.4% to 19.1%; the fruit cleanness is obviously improved, use of swelling agents and high-poison and mediate-poison pesticide is effectively eradicated, and quality safety of the fruits is guaranteed.

The invention provides a tobacco material winnowing method and an equipment thereof. The tobacco material enters through a transportation equipment into a primary winnowing room to choose sundry goods of larger density by the primary winnowing room having higher wind speed; the tobacco material which is wind separated by the primary winnowing enters into a secondary winnowing room having lower wind speed to choose sundry goods with less larger density; the tobacco material which is wind separated by the two winnowing processes is output via a discharge opening. The equipment implementing the method comprises two winnowing rooms connecting with each other in parallel, supplementation wind gap of each winnowing room is provided with a damper to obtain proper air quantity and air speed for winnowing. The equipment is capable of achieving winnowing the tobacco material for two times with enhanced winnowing efficiency, simple structure and convenient maintenance.

A roll screen comprises side plates, a winding pipe rotatably supported on the side plates, a spring mounted in the winding pipe, a screen to be wound on the winding pipe by the accumulated force of the spring, and a brake mounted in the winding pipe for decreasing a winding speed of the screen from a final stage of the winding of the screen. The clutch case is engaged with the brake from a final stage of the winding of the screen, and the brake is operated so that the winding speed of the screen can be decreased.

A system for covering (i.e., closing) various types of sites where waste is deposited comprises a composite of one or more geotextiles that are tufted with synthetic yarns and an impermeable geomembrane, which is comprised of a polymeric material. The cover can include wind-resistant textured synthetic blade-like elements, such as vertical filaments, secured over a low-permeable polymer liner backing. Advantageously, the system does not rely on piled-on weight to resist wind forces and the cover can be deployed over a large area with little or no ballasting or anchoring. Optionally, the cover includes vertical filaments attached to the liner to break the wind aero-dynamics on the exposed cover.

A fluid flow control device for an aerofoil comprises an aerofoil-tip body of aerofoil shape, coupling apparatus adapted to couple one end of the body to an aerofoil, and a passive tip blowing assembly. The passive tip blowing assembly is provided at the other end of the aerofoil-tip and comprises a housing defining a fluid chamber and a vane of aerofoil shape. The fluid chamber extends along part of the chord-length of the body and has a fluid inlet and a fluid outlet. The vane is arranged along the chord of the aerofoil-tip, with its leading edge at the inlet and its trailing edge at the outlet. The aerofoil section of the aerofoil-tip has a higher camber than that of the aerofoil, which turns fluid flow across the low pressure side of the aerofoil towards the aerofoil-tip, so that the fluid flow mirrors the fluid flow across the high pressure side of the aerofoil.

The invention discloses an air conditioner indoor unit. The air conditioner indoor unit is provided with an air outlet, a shielding part, a controller and an infrared detector. The shielding part is used for shielding or opening the air outlet. When the air conditioner indoor unit is in a refrigerating running state, the controller is used for controlling the infrared detector to detect whether a human body exists in an air supply area of the air conditioner indoor unit or not; when the controller receives the signal that the infrared detector detects that the human body exists in the air supply area, the controller controls the air conditioner indoor unit to get into a preset running mode and controls part of the shielding part to shield the air outlet; and when the controller receives the signal that the infrared detector detects that no human body exists in the air supply area, the controller controls the air conditioner indoor unit to quit the preset running mode, and controls the shielding part to open the air outlet. The invention further discloses an air conditioner indoor air outlet control method. When a person is in the air supply area, the air outlet volume of the air conditioner indoor unit is automatically reduced so as to reduce the air speed of the environment, and the comfort degree of the environment is improved.

The invention discloses a silk-coating method for PVC/PU coating polyester industrial yarns and a device thereof. The method comprises the following steps: using polyester industrial yarns as raw materials and a core layer structure; adopting a PVC-coating adhesive as a surface structure; dipping the polyester industrial yarns in the PVC-coating adhesive so that the adhesive is stuck to the silk;extruding the silk; scraping the adhesive; then, winding the silk in a spiral shape and baking; and drying, cooling the dried silk by cold air and coiling so that the coating adhesive is deeply permeated and coated on the core layer structure to form the silk of the coating polyester industrial yarns. The composite silk material has the advantages of high strength, good toughness, corrosion resistance, aging resistance, and the like. A melting point of PVC, PU or PE coating adhesive on the surface is lower than that of core-layer polyester yarns, woven fabrics in a stretching state are baked at high temperature or thermally rolled, shaped and processed, and warp yarns and weft yarns are melted and fused by the coating adhesive so that mesh fabrics are integrally smooth and stiff and meshesare uniform and stable.

The invention discloses a transverse polar plate bipolar static agglomeration dedusting device and a dedusting method thereof, which solve the problem that the conventional dedusting device is complex in structure and relatively poor in dedusting effect. The invention adopts the technical scheme that the transverse polar plate bipolar static agglomeration dedusting device comprises a deduster casing as well as an air inlet pipe and an air outlet located at the two ends of the deduster casing; a plurality of cathode frameworks and a plurality of anode frameworks are vertically, alternately and uniformly arranged in the deduster casing in the direction of an airflow; a plurality of cathode plates and a plurality of cathode coronal lines are alternately and uniformly distributed on the cathode frameworks in the vertical direction, and a plurality of anode plates and a plurality of anode coronal lines are alternately and uniformly arranged on the anode frameworks; moreover, the cathode coronal lines are corresponding to the central lines of the adjacent anode plates in the direction of the airflow, and the anode coronal lines are corresponding to the central lines of the adjacent cathode plates in the direction of the airflow; the cathode frameworks are connected with the high-voltage output ends of a high-voltage DC power supply via a high-voltage cable, and the anode frameworks are connected with the grounding pole of the high-voltage DC power supply via a grounding cable. The transverse polar plate bipolar static agglomeration dedusting device is simple in structure, small in size, simple and convenient to operate, outstanding in the dust collection effect of the reverse sides of the transverse polar plates, small in reentrainment of dust, and has the effect of static agglomeration dedusting.

The invention relates to a lift movable wind-proof net device, which comprises a wind-proof net, a movable device and a transmission lifter. Wherein, the wind-proof net and the transmission lifter are arranged on one platform; said platform is mounted with front and back rows of several support posts, while the top ends of each two front and back relative support posts are mounted with connecting support; said wind-proof net is fixed at the front row of support posts; two support posts of back row of support posts that near the platform are fixed with one end of incline support post; another end of incline support post is fixed at one end of platform; the middle of platform is arranged with transmission lifter, to control the wind-proof net. The invention has lower cost to control the powder pollution and save water, while it can be used for more than 20 years. The invention can effectively reduce the wind speed and reduce the wind impulse speed, to protect the environment.

A wind turbine includes a rotary shaft having an axis of rotation, a plurality of turbine blades supported for rotary motion by the shaft, and a plurality of magnets supported by and spaced outwardly from the rotary shaft. The blades are mounted to the shaft by a mount that is radially inward of the magnets wherein the magnets have an annular velocity of at least the annular velocity of the blades. The turbine also includes a conductive coil, which is located outwardly from the magnets and the blades, wherein the coil surrounds the magnets and the blades and which is sufficiently close to the magnets such that rotary movement of the magnets induces current flow in the coil.

The invention discloses an indoor unit of an air conditioner and a control method of the indoor unit. The indoor unit of the air conditioner comprises a housing, a first air deflector, a second air deflector and a third air deflector, wherein the housing is provided with a wind channel which is provided with a wind outlet formed in the peripheral wall of the housing; the first air deflector is rotatably arranged on the housing for opening or closing the wind outlet; the second air deflector is rotatably arranged on the housing and is located inside the first air deflector; a plurality of first wind dispersing holes are formed in the second air deflector; the third air deflector is rotatably arranged on the inner wall of an air flue; when the first air deflector closes the wind outlet, the second air deflector is basically parallel to the first air deflector; the third air deflector is basically parallel to the wind out direction of the wind outlet; in a no wind feel mode, the upper end of the third air deflector is suitable for being matched with the lower end of the second air deflector so as to close the wind outlet; a plurality of wind dispersing holes are formed in the third air deflector. According to the indoor unit of the air conditioner disclosed by the invention, no wind feed wind supply is realized.

The invention provides an air-conditioner control system and a control method thereof; the air-conditioner comprises a low output running mode with relatively low output energy and a high output running mode with relatively high output energy; the air conditioner can be mutually switched between two running modes, and the control system comprises a detecting unit, a judging unit, and a control unit. The detecting unit is used for detecting an inner ring of indoor environment temperature T; the judging unit is used for calculating the inner ring-T setting I of delta T=IT, and judging if delta T is not more than T1, wherein T is set as the indoor setting temperature of the air conditioner, T 1 is setting value and any positive number; the control unit can run the air condition in low output running mode or high output running mode according to the judging result of the judging unit. Through the invention, the room temperature can slowly change when closing to the T setting scale, prevent exceeding the setting temperature for too fast drop or rise of room temperature, avoid frequent startup of compressor, effectively prevent fluctuation of indoor environment temperature, and improve the comfort level of the indoor environment.

The invention relates to an air conditioner control method, an air conditioner control system and an air conditioner. The air conditioner control system comprises an infrared array sensor, an air conditioner height acquiring module, a sensor field-of-view acquiring module and a central processing module, the infrared array sensor is used for acquiring temperature image data of current environment, the air conditioner height acquiring module is used for acquiring a vertical height H between the air conditioner and the ground, the sensor field-of-view acquiring module is used for acquiring field-of-view data of the infrared array sensor, the central processing module is used for extracting heat source position information in the temperature image data, calculating a horizontal distance D and a heat source height L between a heat source and the air conditioner according to the heat source position information, the vertical height H of the air conditioner and the field-of-view data of the infrared array sensor and controlling running state of an air outgoing mechanism of the air conditioner according to the horizontal distance D and the heat source height L. Cost is not increased, control is simple, and air supply control aiming at limited areas can be realized.

The present invention discloses an ice-temperature vault. The aim of the invention is to provide an ice-temperature vault which has the advantages of high-precision control, uniform wind speed field in the vault, uniform temperature field in the vault, and satisfaction to the requirement of ice-temperature storage. The vault body comprises a base layer heat insulation layer, an outer heat insulation vault body and an inner non-heat-insulation vault body which are connected with the base layer heat insulation layer. An air interlayer is provided between the inner non-heat-insulation vault body and the outer heat insulation vault body. A plurality of air coolers which are connected in parallel for alternately operating or defrosting are installed in the air interlayer at the top part of outer vault body. A top air supply aperture plate is provided in the inner vault body. A static pressure box layer is formed between the top air supply aperture plate and the inner non-heat-insulation vault body. The periphery at the base part of inner non-heat-insulation vault body is provided with a plurality of return air grilles. A temperature sensor is respectively installed at the lower part of static pressure box layer and at the return air grilles. The temperature in the ice-temperature vault is stable. The speed field and temperature field are extraordinarily uniform. The defrosting does not affect the temperature in the vault. The ice-temperature vault has high control precision. The temperature fluctuation of hollow vault does not exceed +/- 0.3 DEG C.

The present invention relates to a reduction device for a roll screen, as a compressive piston of a reduction part comes in and out inside of a cylinder combined with a one end of inside of a winding bar, to a device being capable of winding and loosening the roll screen easily and conveniently, more particularly to a device being capable of preventing a noise, an impact and a safety-accident and being capable of operating easily without distinction of age or sex, young and old, men and women all alike, due to a winding of the roll screen by way of reducing a speed of the roll screen with a definite section while the roll screen is wound.