114results about How to "Reduce local resistance" patented technology

The invention relates to an adjustable distribution air flue for a rail transit air conditioner and a control method of the adjustable distribution air flue. The adjustable distribution air flue comprises a distribution air flue body. An air inlet of the distribution air flue body is connected with an air conditioner unit. The two ends of the of the distribution air flue body are provided with a first air outlet and a second air outlet correspondingly. The adjustable distribution air flue has the characteristics that an air regulation structure used for regulating the air outlet volume of the first air outlet and the second air outlet is installed in the distribution air flue body; the air regulation structure comprises a first flow guide plate and a second flow guide plate which guide outlet air to be discharged through the first air outlet and the second air outlet correspondingly; the upper end of the first flow guide plate is connected with the upper end of the second flow guide plate; the lower end of the first flow guide plate is connected with the lower end of the second flow guide plate through a connection plate; a tooth-shaped guide rail is fixed to the connection plate of the air regulation structure; a servo motor is installed on the outer side of the distribution air flue body; a power output shaft of the servo motor is connected with a gear; and the gear meshes with the tooth-shaped guide rail. According to the adjustable distribution air flue for the rail transit air conditioner and the control method of the adjustable distribution air flue, air distribution in a carriage can be optimized, and the noise level in the air flue can also be lowered effectively.

The invention provides a self-operated three-way valve used for a special machine in a refrigerant circulation parallel machine room. The three-way valve comprises a valve body, a low pressure air inlet pipe, a high pressure air inlet pipe and an exhaust pipe. The valve body is internally provided with a piston component, a valve seat and a sliding valve. The internal chamber of the valve body is divided into a low pressure chamber and a high pressure chamber by a piston which can axially move. A low pressure capillary is connected between the low pressure chamber and the low pressure air inlet pipe. A low pressure capillary is connected between the high pressure chamber and the high pressure air inlet pipe. The low pressure chamber and/or the high pressure chamber are/is internally provided with a spring. By the pressure difference of the suction and exhaust when a spring force and a compressor are stated, the piston component which is arranged in the valve body drives the sliding valve to be closely attached to the surface of the valve seat to slide, thus achieving the communication between the high pressure air inlet pipe and the exhaust pipe and the communication between the low pressure air inlet pipe and the exhaust pipe. The three-way valve needs no outside power, can achieve the free switching of refrigerant refrigeration circulation and the natural circulation just according to the running state of the compressor, thus sufficiently displaying the energy-saving advantage of the special machine in the refrigerant circulation parallel machine room and improving the operation reliability.

A method and apparatus for a generator coil includes a plurality of stacked windings in a rotor where individual turns are stacked in parallel sided radial slots in the rotor. Each successive turn has the same width substantially corresponding to a constant width of each slot, wherein a first turn has a first thickness and a second turn has a second thickness thicker than said first thickness. The second turn is employed in regions of high temperature thereby reducing the temperature thereof.

The invention relates to a device and method for large-diameter horizontal borehole bridging goaf gas extraction, and belongs to the technical field of coal mine gas safety. The device comprises a casing, a butterfly valve, a three-way joint and a pumping pipe. The butterfly valve is mounted on the casing, and the casing is connected to the pumping pipe through the three-way joint; the casing is placed inside a horizontal borehole; the horizontal borehole is formed in a coal pillar between a belt transporting crossheading of the working face and an air inlet duct of the adjacent working face and penetrates the coal pillar; a device for determining the flow rate, the temperature and the gas and carbon monoxide gas concentration is installed on the pumping pipe to monitor the gas extractionin a horizontal borehole bridging goaf. The device and method solve the difficulty in gas control of the return air corner on the high-strength working face under the condition of the 'Y' type ventilation mode, achieves multiple-point continuous controllable pumping of the gas in the goaf and monitors spontaneous combustion of the residual coal in the goaf in real time while effectively controlling corner gas emission.

The invention provides a dustproof mouth mask with a dynamic breathing function for a dust work environment. A filter material of the dustproof mouth mask adopts corrugated filter sponge, the adopted corrugated angle theta of the filter material is less than 60 DEG, a corrugated generating line is parallel to the gravity direction, and an air outlet and the downstream part of the filter material at an air inlet of the mouth mask are provided with a high-speed centrifugal fan respectively. On the premise of meeting the air flow for breathing of a human body, the effective filter area of the filter material is increased, the air speed is reduced, the flow resistance of the filter material is reduced, and the inhalation resistance is reduced. A micro electric air supplying and exhausting system and the micro high-speed centrifugal fan are adopted; and the requirement of the pressure in the inhaling process of the human body can be fully met, and the increment of the pressure in the inhaling process of the human body is controlled to be in the reasonable range at the same time. The breathing pressure difference of the novel mouth mask is controlled to be within 30 Pa, the structure design and the control of the whole system are simplified while the safety is met and the comfort is improved, and the mouth mask is small in volume, light in weight and convenient to carry.

The invention discloses a stop valve of a pipeline, which comprises a valve clack, wherein the valve clack comprises a sealed valve plate and a lower cylindrical body which is vertical to the valve plate; the internal surface of the lower cylindrical body of the valve clack is a cylindrical ring surface, the cylindrical ring surface is vertical to the sealed surface of a valve seat at a fluid inlet, and an outlet is tangential to an inlet of a valve body, i.e. the tangential line of the center line of the cylindrical ring surface at the outlet is superposed with the tangential line of the center line of the section at the inlet of the valve body. The cylindrical ring surface can be a cylindrical ring with equal diameter and can be also a cylindrical ring with variable diameter. The valve clack of the stop valve structure can lower the local resistance of the valve obviously, lower the pressure of a medium on a valve rod because the structure of the valve clack enables the medium to smoothly flow from an inlet of a valve cavity to an outlet, reduce the energy loss of the pipeline valve greatly, save the running cost of the pipeline and play an indispensable positive role in the aspects of environmental protection and energy saving.

The invention relates to a direct-connection even-flow pulse bag type dust collector, which comprises an upper box body, a middle box body, an ash bucket, a skid mount package and an automatic control system. After dust air enters, the dust air which passes through a low efficient filter directly enters an air flow distribution device to be shunted; a filtering frame is arranged in each filtering bag to support the filtering bag to enable filtered purified air to flow to the upper box body; the automatic control system automatically controls a cabinet to close an air inlet valve when the resistance of the filtering bag reaches a certain value, pulse jet is carried out to remove dust on the surface of the filtering bag; an air compression bag and a pulse valve are opened, air filtered by a high efficiency filter directly enters an injection pipe, and dust on the filtering bag which is under the function of pulse external force falls. The air flow distribution device of the direct-connection even-flow pulse bag type dust collector has a reasonable structure, airflow which contains dust is conveyed to the filtering bags on different positions from a front side, side surfaces and the bottom surfaces, so that the washing of the airflow which contains dust for the filtering bags is avoided, and the flowing of the airflow which contains dust from bottom to top is slowed down so as to reduce the secondary attachment of the dust and guarantee the dust removal efficiency of the filtering bags.

The invention relates to an engine test propellant supply low frequency ripple suppression method and system. Accurate helium injection is performed on the propellant supply pipeline, the inherent frequency of the propellant supply system is changed through gas mixing, and the ripple of the propellant can be adjusted through accurate control of the injection gas volume, the gas distribution and the injection gas form and the coupling situation of the propellant supply system and the engine can be reduced. With application of the method, the propellant supply ripple can be reduced, the propellant supply stability can be enhanced and thus the stability of the whole engine pump system can be enhanced. The method and the system are applied to the engine test.

The invention provides a noise reduction air duct of an automobile air conditioner, which can solve the problems that the existing noise reduction air duct has complex structure, high manufacturing cost, and is not conducive to processing, installation and mass production. The invention aims at reducing the aerodynamic noise by reducing the airflow velocity in the air duct and avoiding the generation of the vortex. the noise reduction air duct comprises a noise reduction air duct body, the noise reduction air duct body comprises an air inlet section, a transition pipe section, a straight pipesection and a Z-shaped elbow section provided with two corners, The bottom surfaces of the Z-shaped elbow section and the straight pipe section are provided with grille-type air outlets, the air inletsection is butted with the air outlet of the automobile air conditioner, the two ends of the Z-shaped elbow pipe section are respectively connected with the transition pipe section and the straight pipe section, the transition pipe section is in the shape of a flared opening with a variable section, the small opening end of the transition pipe section is connected with the air inlet section, andthe large opening end is connected with the Z-shaped elbow pipe section.

An open experiment device for teaching the local resistance measurement during air flowing relates to an experiment device for measuring the local resistance during the air flowing. The open experiment device aims at measuring the change of local flowing resistance in the flowing process, which happens together with the change of a flow passage and the change of flowing speed, so as to further obtain a flow passage structure with the minimum flowing resistance in the same wind speed. A frequency-variable speed-regulating draught fan is communicated with a small end of a retraction section tube. An experiment section is arranged between two measurement section tubes and detachably communicated with one end of each of the two measurement section tubes. Each measurement section tube is provided with a Pitot tube. Each Pitot tube is connected with an electronic microtasimeter. The middle part of the lateral wall of each measurement section tube is provided with at least two pressure obtaining holes. The pressure obtaining holes on the two measurement section tubes are respectively communicated with pipelines and connected with the electronic microtasimeters for measuring pressure difference. Due to the open experiment device, the flow passage structure with the minimum flowing resistance in the same wind speed can be obtained. The resistance in the flowing process is reduced so that the power of the fan for driving the flow is greatly lowered, the electricity consumption is reduced, and the energy is saved.

The invention provides an SCR denitrification ammonification and flow field homogeneous structure and an operating method thereof. The structure has the advantages of high mixing uniformity between ammonia gas and flue gas, reasonable flow field, low local resistance and simple configuration. Ammonification pipe series are fixed in a linear-segment flue; the ammonification pipe series are provided with ammonification holes; the outer bend of the bend flue is composed of an outer-chamfer plate; the inner bend of the bend flue is composed of an inner arc plate; a front guide plate is fixed in the bend flue; a back guide plate is fixed to the inside of an inlet of a reactor; and a rectifier unit module is fixed in the reactor. Ammonia gas is quickly ejected via the ammonification holes of the ammonification pipe series, and is subjected to opposed-flow diffusion and taken away by the flue gas; ammonia molecules are further diffused under the barrier action of mixed flow plates of mixed flow assemblies, are divided to the two sides of the mixed flow plates at higher speed, are subjected to slow guiding after sufficient mixing, and finally, are uniformly dispersed in the flue gas; and the flue gas is adjusted and distributed uniformly by the rectifier unit module and reaches the catalyst on the first layer.

The invention discloses an intelligent flow balancing device. The intelligent flow balancing device comprises an intelligent water valve actuator, temperature sensors, a water supply pressure sensor, flow balancing valves and pilot tube flowmeters, wherein the intelligent water valve actuator is arranged on a pipeline, the temperature sensors are arranged on a water supply pipeline and a water return pipeline, the water supply pressure sensor is arranged on the water supply pipeline, the flow balancing valves are arranged on the water supply pipeline and the water return pipeline and controlled by the intelligent water valve actuator, the pilot tube flowmeters are arranged between the flow balancing valves and the intelligent water valve actuator, and a calculation chip is arranged in the intelligent water valve actuator. By the adoption of the intelligent flow balancing device, a straight-through type valve is used for reducing local resistance; flow sensors and the temperature sensors are arranged on all branched pipes, and the calculation chip is arranged in the intelligent water valve actuator so that the balance of a system can be re-adjusted according to the actual operating condition while the monitoring function is achieved, the maintenance cost is reduced, the structure is simple, and operation is convenient.

The invention discloses a dry method desulphurization absorption tower with a top round bent pipe outlet. In order to solve the problems that the square outlet of the prior dry method desulphurization absorption tower has overlarge local resistance, inordinate flue gas flow field, easy generation of solid particle accumulation on a local part and the like. The upper part of a main body section (1) of the absorption tower is connected with a reducing section (2); the upside of the reducing section (2) is provided with an outlet flue (3) which adopts a round bent pipe flue and is connected with a round square section (4); and the underside of the round square section (4) is provided with an adjusting section (5) which is connected with the inlet of a dust collector (7). The design of the absorption tower not only greatly reduces the local resistance of the outlet, optimizes the flue gas flow field and reduces the local solid particle accumulation, but also can remarkably reduce the construction cost; besides, the absorption tower has the advantages of simple manufacture, convenient maintenance, long service life and the like.

The invention discloses an electrode roasting furnace with a lid in the field of graphite electrode production, particularly relates to a furnace floor flue gas channel structure of the electrode roasting furnace with the lid. The furnace floor flue gas channel structure is realized by the following steps: an ondol pier is arranged between a furnace floor masonry and ondol surface bricks and is composed of an upper ondol pier brick section and a lower ondol pier brick section. The calandria arrangement in the furnace floor flue gas channel that is formed by the ondol pier bricks with circular sections greatly lowers the local resistance loss of flue gas. As the furnace is a running system consisting of a plurality of furnace chambers, the accumulated reduction value of local resistance loss is very remarkable. As section size of the ondol pier bricks is reduced and the calandria flue gas channel structure is additionally arranged, the flue gas circulation area in the channel is increased, and the friction resistance loss in the flue gas circulation process is effectively reduced.

The invention discloses a wind-driven generator set, a motor and an air flow transfer device for a motor air gap. The air flow transfer device for the motor air gap comprises an annular air distribution chamber; the annular air distribution chamber is located at least one end of the air gap; and the annular air distribution chamber has a transfer opening facing the air gap to as to transfer hot orcold air flow to the air gap. According to the air flow transfer device for the motor air gap, the annular air distribution chamber is arranged at the end of the air gap; required air flow is injected into the annular air distribution chamber, and the annular air distribution chamber can output accumulated air flow to the air gap, so that the air flow can be facilitated to smoothly pass through the air gap, and the flow rate of the air gap can be controlled with easiness, and therefore, the air flow can be effectively outputted into the air gap, and the local resistance of the air flow entering the air gap can be decreased; and the air flow entering the air gap can contact the outer circumference of an entire core, so that the cooling and drying effect of the core can be improved.

The invention discloses a novel automatic bidirectional air regulating device, and provides the bidirectional air regulating device for automatic switching between a local fan and a standby local fanduring normal operation; the maintenance rate of the local fan air regulating device is reduced, and internal air leakage of the regulating device is completely eradicated. According to the followingtechnical scheme, the novel automatic bidirectional air regulating device includes a main hair dryer, a standby hair dryer, a three-links shell body, and a chimney fan, wherein an air guiding valve for switching air sources is installed in the three-links shell body; the novel automatic bidirectional air regulating device is characterized in that the three-links shell body is a Y-shaped shell body, the main hair dryer and the standby hair dryer are installed at the wider end of the three-links shell body, and the chimney fan is installed at the other end of the three-links shell body, and themain hair dryer and the standby hair dryer are respectively connected with a main air blower and a standby air blower; and the air guiding valve is installed between the main hair dryer and the standby hair dryer in the three-links shell body, and a valve baffle of the air guiding valve is installed above a valve baffle seat through an articulated shaft.

The invention discloses a device for pre-removing popcorn ash of an SCR denitration system. The device comprises a vertical shaft flue, a horizontal flue and an uptake shaft which are connected in sequence, wherein the turning connection positions between the horizontal flue and the vertical shaft flue and the uptake shaft respectively have streamline appearances, an ash hopper is arranged on the lower side of a base plate of the horizontal flue, and a catcher, a separator and a filter screen are sequentially arranged on the side in the smoke flowing direction. A smoke circulating port is formed in a base plate of the tail portion of the horizontal flue and is communicated with the ash hopper. The invention further provides a method for pre-removing popcorn ash of the SCR denitration system. The flinging wall characteristics at the connection positions of the streamline vertical shaft flue and the horizontal flue which are installed without guiding plates are utilized to form a high-ash-concentration flue airflow, and popcorn ash and smoke are efficiently separated by sequentially adopting the catcher, the separator and the filter screen based on streaming impact type separation, gravity settling separation and intercepting separation principles. Rapid and effective separation of high-temperature and high-concentration popcorn ash is achieved by adopting the method, and the device has the advantages of being simple in structure and safe and stable in operation.

Provided in the invention is a push chain type concrete spraying machine with a distributor. The spraying machine comprises a chain type piston, an injection cylinder, a high-pressure pipe, a mixing chamber, and a spraying elbow. The mixing chamber is arranged in the middle of the injection cylinder; and the chain type piston penetrates the injection cylinder. The machine is characterized in that a distributor is arranged above the mixing chamber; the high-pressure pipe is connected to the top of the distributor; the spraying elbow is linked below the mixing chamber; air injection holes are formed in the middle of the distributor and the lower ends of the air injection holes are opposite to the upper space of the chain type piston in the mixing chamber, so that attachments of the chain type piston can be cleaned. The distributor is arranged on the mixing chamber; the high-pressure pipe is arranged on the distributor; the chain type piston passes through the injection cylinder; and compresses air is processed by flow acceleration of the distributor and thus the concrete is blown to the spraying elbow. Compared with the prior art, the spraying machine has the following beneficial effects: with the reducing injection pipe type distributor, the outlet injection speed of the compressed air is improve, thereby enhancing the injection capability; a problem that hanging materials can not be blown completely by the chain type piston can be solved; and the machine has the great popularization value.

The invention discloses an aluminium electrolysis cell anode carbon block. The upper surface of the anode carbon block is a plane, wherein the plane of the upper surface of the anode carbon block is provided with concave carbon bowls connected with steel talons below an anode guide rod; the carbon bowls are arranged in one row or two rows at equal distances along the length direction of the anode carbon block, and each row comprises 2-4 carbon bowls; and a groove is arranged from the position which is 50-200mm below the upper surface of the anode carbon block in the middle of two adjacent carbon bowls on the anode carbon block to an anode bottom palm. According to the aluminium electrolysis cell anode carbon block, CO2 gas generated on the bottom surface of the anode in the electrolysis process can be smoothly discharged into a space formed by the upper surface of an electrolyte melt to the top of the groove in the whole anode working period or during most time; and when the upper part of the top of a lateral groove in the middle of the length direction of the carbon anode is provided with a vertically through narrow slit, the narrow slit has the function of reducing anode end tip damage because the narrow slit releases expansion force on the carbon anode connected with the anode steel talons on the end part by the thermal expansion of the beam with the upper steel talons of the anode in the electrolytic cell at a high temperature.