63results about How to "Stable air flow" patented technology

The invention belongs to the field of environment simulation and control, and relates to a dynamic aviation thermal power testing system and a rapid temperature and pressure control method which are mainly used for the airplane environment control system ground simulation test and are capable of achieving rapid temperature, pressure and flow adjustment and carrying out rapid temperature increasing and reducing and pressure increasing and reducing of an environment control system and the full-flight envelope dynamic simulation test. According to the dynamic aviation thermal power testing system, the project achieving difficulty of a heater is lowered through an indirect heating mode, and the possible problem of dried burning due to direct heating can be avoided. The temperature and pressure are independently controlled, and the temperature and pressure coupling effect is eliminated. A rapid adjusting mechanism is arranged in front of a heat exchanger, the project achieving difficulty of the adjusting mechanism is lowered, accordingly, the reliability of the system is improved, and the manufacturing cost of the system is reduced. The system is further provided with a heat regenerator, part of waste heat can be recycled, the system efficiency is improved, and the consumed energy of the system is reduced.

The invention relates to an air valve adjustment device of a gas cooker, and the gas cooker. The air valve adjustment device comprises an ejection pipe, an air valve sheet, a gas nozzle, an elastic element and a driving part, and further comprises a first positioning part and a second positioning part, wherein the first positioning part is arranged one of the air valve sheet and the ejection pipe and comprises at least two limiting grooves; the second positioning part is arranged at the other one, of the air valve sheet and the ejection pipe, on that the first positioning part is not positioned; the second positioning part is suitably positioned in the limiting groove; and when the driving part drives the air valve sheet to move around the gas nozzle, the second positioning part can move out from one limiting groove to move into the adjacent limiting groove. The air valve adjustment device disclosed by the invention not only is convenient to adjust but also can prevent the incidental rotation of the air valve sheet, so that the stability of the gas cooker during use is improved.

The present invention discloses a large-flow vertical radial flow adsorption device with the characteristic of layered parallel connection design, and a method thereof. The adsorption device comprises a housing, an adsorbent filling layer, an upper unit inner side multi-pore distribution cylinder, an upper unit outer side multi-pore distribution cylinder, an inner side diversion cylinder, a lower unit inner side multi-pore distribution cylinder, a lower unit outer side multi-pore distribution cylinder, an outer side diversion cylinder, a middle baffle, a middle baffle filler cover, a bottom support plate, and a flow finishing shelf. According to the present invention, the internal of the adsorption device is designed into the two separate adsorption unit connected in parallel and comprising the upper adsorption unit and the lower adsorption unit, such that the adverse influence of the height of the adsorption bed on the uniform flow field distribution can be eliminated, and the maximum design height of the vertical radial flow adsorption device can be significantly increased; and the large-flow vertical radial flow adsorption device with the characteristic of layered parallel connection design has advantages of shell housing diameter, small occupation area, high flow field uniformity and the like in the case of the same air treatment amount.

The invention relates to an air compressor high-altitude environment test system and an adjusting method. The air compressor high-altitude environment test system comprises an air inlet temperature adjusting system, an air inlet pressure adjusting system, an exhaust system, a low-pressure test cabin, a power system, a transmission system, an exhaust heat exchange system, a test air compressor and the like. The air inlet temperature adjusting system, the air inlet pressure adjusting system and the low-pressure testing cabin are sequentially connected, the testing air compressor and the transmission system are both arranged in the low-pressure testing cabin, the power system is connected with the transmission system in the low-pressure testing cabin through a lamination coupling, and a transmission system casing is in sealing connection with a low-pressure testing cabin shell through a corrugated pipe structure. Low-pressure air and ambient atmosphere in the low-pressure test chamber are isolated, the rotor system is kept in the same temperature environment, the corrugated pipe can compensate thermal deformation of the casing, and the concentricity of a pivot of the rotor system is improved. According to the adjusting method, manual adjustment and PID automatic adjustment are combined to maintain the stability of the air inlet pressure and flow of the test air compressor, and therefore continuous and variable adjustment of the Reynolds number of the test air compressor is achieved.

The invention relates to an automatic adjustable laval pipe, which can automatically change the pipe diameter of the laval pipe, realize adjustment of the required air quantity according to the characteristics of materials, provide stable air flow under the condition of air pressure fluctuation, and is suitable for a material conveying system which requires regular adjustment of the air quantity. The automatic adjustable laval pipe mainly comprises an air inlet pipe, a regulating stem and a fixed laval pipe, wherein the air inlet pipe and the fixed laval pipe are fixedly connected with each other; the regulating stem runs through the air inlet pipe; the outer end part of the regulating stem is connected with an automatic pressure regulator, and the inner end part of the regulating stem is extended into an inlet of the fixed laval pipe; a cross section of the inlet is provided with a funnel-shaped curved structure; a first section of curve is a section of circular arc of which the circle center is on an inlet interface of the fixed laval pipe; a third section of curve is a section of circular arc of which the circle center is on a minimum cross section on a throat section of the fixed laval pipe; and a second section of curve is a common tangent line which connects the first section of curve and the third section of curve.

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 oleophobic modification method of polybutadiene membrane. A fluorinating agent is adopted to conduct immersion treatment on silicon dioxide nano-particles, then the fluorinated silicon dioxide nano-particles are supported on polybutadiene fiber through a suction filtration method to obtain a porous polybutadiene membrane material having hydrophobic and oleophobic properties. The oleophobic property of the polybutadiene membrane is improved, and water and oil contact angles of the modified polybutadiene membrane are respectively 143 degrees and 120 degrees. The modified polybutadiene membrane shows stable air flow and also shows good suction filtration property in an oil-containing system, and the retention rate of oily smoke reaches 99.5% or above.

The invention provides an air conditioner indoor unit. The air conditioner indoor unit comprises a shell, a first air guide plate and a second air guide plate, wherein the shell is provided with an air outlet facing the front lower portion; and the first air guide plate and the second air guide plate are rotatably installed on the front side of the air outlet and the lower side of the air outlet correspondingly to open and close the air outlet in a coordinating manner, and the second air guide plate is configurated in a front air guide state that the second air guide plate can be rotated to belocated on the lower side of the air outlet and make an air guide face of the second air guide plate face upwards to guide air feeding airflow to the front portion, the front upper portion or the front lower portion and in a lower air guide state that the second air guide plate can be rotated to be located on the rear side of the air outlet and make the air guide face of the second air guide plate face forwards to guide the air feeding airflow to the lower portion. By means of the air conditioner indoor unit, cold air upward blowing and hot air downward blowing can be realized.

This invention discloses a blood pressure measurement device including a cuff having a bladder wrap around an object to be measured, a MEMS pump for inflating the bladder with air, a pressure sensor for monitoring the pressure in the bladder, and a microcontroller for controlling the pressure sensor to continuously receive pressure signals during the process of inflating the bladder, converting the pressure signals into blood pressure values, and controlling a drive voltage level of the MEMS pump to maintain an air inflation speed of the MEMS pump in a predetermined inflation speed range. The invention further discloses a method for controlling a fixed frequency change of the blood pressure measurement device.

An air cleaner particularly disposed for an internal combustion engine is provided with a housing, a filter element disposed in the housing, and adsorbent disposed on the side of an outlet formed to the housing and adapted to adsorb an evaporated fuel invaded inside the housing through the outlet. The adsorbent includes an adsorbing material adsorbing the evaporated fuel and a pair of non-woven fabrics sandwiching the adsorbent material from both sides thereof, and at least one of the non-woven fabrics disposed on the outlet side includes a reinforcing material so as to be integrated with the non-woven fabric.

The invention discloses technology and equipment for treating local gas accumulation of a coal mine working face through an air multiplication principle. High-pressure air flow flowing from an annular fracture with the width being only 1.3 mm in the inner side of a machine body is used for blowing gas accumulated in regions such as an upper corner. The equipment is composed of an air inlet, an inner rotation device, an air outflow ring adjusting device and an air outflow ring. The technology specifically includes the steps that clean air flow in a mine pressure ventilation pipeline is used as power, gas is led to the equipment according to the injection principle, the air flow is conveyed to the air outflow ring through inner rotary fan blades, and the purpose that the concentration of the accumulated gas is reduced is achieved through the effective air flow output by the air outflow ring. By the adoption of the equipment, the size and the direction of the air flow can be adjusted according to the actual condition, and the regions are completely covered; about 10 to 15 times of air around can be driven to flow through the air multiplication principle, a negative pressure region is generated behind the air outflow ring through the high-speed moving air jet flow, and surrounding air is sucked. The equipment can be installed in the gas accumulated region positions such as the upper corner and an air return way, the accumulated gas is effectively blown away, and safe and efficient production of a coal mine is guaranteed. The technology and equipment are suitable for being used and popularized in underground coal mine mining.

The invention belongs to the technical field of air conditioners, and particularly relates to an air guide assembly of an air conditioner. The air guide assembly of the air conditioner comprises an air guide plate, an air guide protrusion and an air guide rail. The air guide plate comprises a first arc-shaped structure and a second arc-shaped structure. The first arc-shaped structure can expand the air outlet space of the leeward side of the air guide plate, the air guide protrusion can guide part of air flow in the shell to flow to the first arc-shaped structure, and the air flow of the leeward side of the air guide plate is increased. The air guide rail can enable airflow to flow along the leeward side of the air guide plate when the airflow flows through the leeward side of the air guide plate. The second arc-shaped structure can increase the air outlet space of the windward side of the air guide plate under the condition that the air guide angle of the air conditioner is not changed. By means of the arrangement, airflow on the windward side and the leeward side of the air guide plate tends to be in a balanced flowing state, the air outlet effect of the air conditioner is optimized, the large temperature difference between the windward side and the leeward side of the air guide plate is avoided, the condensation condition of the air guide plate is improved, and the user experience is improved.

The invention provides an adjustable large-flow compressed air source system which comprises a plurality of compressor air supply pipelines. Compressors are screw type compressors. Each compressor air supply pipeline finally communicates with an air supply main pipeline through a filter and a refrigeration dryer. An electric butterfly valve is arranged in the joint of each compressor air supply pipeline and the air supply main pipeline and used for adjusting the compressed air flow rate and pressure. According to the adjustable large-flow compressed air source system, the flow rate is adjusted in a grouped control mode, the configured adjustment flow rate is selected through a control system, and continuous and stable use requirements from the minimum flow rate to the maximum flow rate are met. The adjustable large-flow compressed air source system can be used for supplying air stably and continuously in a large-flow adjustable mode.

The invention relates to the technical field of engines, and discloses a rotary detonation combustion chamber capable of realizing observation of a flow field structure of an isolation section. The rotary detonation combustion chamber mainly comprises a rotary detonation combustion chamber body and an air inlet mixing module, and the air inlet mixing module is of a hollow interlayer structure andcomprises a radial runway type air inlet section, a radial runway type isolation section and a fuel injection module; incoming air is accelerated by a supersonic nozzle of the radial runway type air inlet section to form supersonic airflow, and the supersonic airflow enters the radial runway type isolation section and is mixed with fuel to form combustible gas; and the high-speed combustible gas is detonated in the combustion chamber body to form high-frequency high-pressure rotary detonation waves, and the high-frequency high-pressure rotary detonation waves disturb the incoming flow to forma shock wave structure which is transmitted forwards to the radial runway type isolation section. Optical glass is arranged on the two sides of a radial runway type isolation section runner, corresponding optical observation equipment is arranged on the two sides of the optical glass, an observation light path passes through an isolation section flow field through the optical glass, and thereforeoptical observation of an isolation section flow field wave system structure is achieved.

A suction nozzle for a road sweep and a road sweeper are disclosed. The suction nozzle comprises an upper cover plate, a front baffle plate, a side rear baffle plate, a suction pipe, and the upper cover plate, the front baffle plate and the side rear baffle plate together form a suction nozzle cavity with an open lower end, and the front baffle plate is a thin plate of two or more layers of soft material. -The invention can realize that the garbage enters the suction nozzle cavity more easily, the air inlet quantity of the front baffle plate is smaller and more stable, the air inlet quantity of the side back baffle plate is larger, and the transverse wind force in the suction nozzle cavity is greater. At that same fan speed and power, the suction nozzle has stronger comprehensive dust absorption capacity; Or, on the premise of the same combined suction nozzle suction, the fan speed and power are lower, and the sweeper fuel consumption and noise are reduced.

The invention belongs to the technical field of coal mine safety, and particularly relates to a ventilating system for managing overrunning of corner gas on a recovery working face. The ventilating system for managing overrunning of the corner gas on the recovery working face is simple and reasonable in structure, and capable of effectively solving the problem of overrunning of the corner gas on the recovery working face. A first air inlet way and an air return way are arranged at two sides of the working face, and a second air inlet way is arranged between the first air inlet way and the air return way. The second air return way is arranged on a side close to the air return way and has the distance of 10cm to 30cm with the air return way, and the second air inlet way is arranged with the air return way in parallel. The ventilating system for managing overrunning of the corner gas on the recovery working face mainly solves the problem of overrunning of the corner gas on the recovery working face.

The invention provides a high-speed electric spindle gas sealing structure for a numerical control lathe, which comprises a spindle box body, wherein a bearing base is arranged in the spindle box body, a spindle is supported in the bearing base through a bearing, a front shaft shoulder end face of the spindle is separated from an inner ring of the bearing through a spindle spacer sleeve, a front flange is sleeved outside the spindle spacer sleeve, a sealing ring is sleeved outside the front shaft shoulder of the spindle, the front end of the spindle is connected with a hydraulic chuck, a waterproof cover is arranged between the hydraulic chuck and the spindle box body, a first-stage pneumatic rotary sealing structure is arranged between the inner circle at the front end of the waterproof cover and the outer circle of the hydraulic chuck, a second-stage pneumatic rotary sealing structure is arranged between the sealing ring and the front shaft shoulder of the spindle, a third-stage pneumatic rotary sealing structure is arranged between the front flange and the spindle spacer sleeve, a fourth-stage rotary sealing structure is arranged outside the front flange and the spindle spacer sleeve, the top of the spindle box body and bearing base, front flange and sealing ring are , provided with sealing gas circuit structure By adopting the four stage gas sealing, the internal air pressure of the spindle is large, the external air pressure is small, the cutting fluid and the scrap iron are effectively prevented from entering the electric main shaft, and the service life of the electric main shaft is prolonged.

The invention belongs to the technical field of mine ventilation, and particularly relates to an optimal selection method for a roof cutting pressure relief gob-side entry retaining ventilation mode.The method specifically comprises the following steps of S1, determining a comparison data column, determining the number n of ventilation schemes and the number m of influence factors of the workingface after gob-side entry retaining after roof cutting and pressure relief, and formulating a comparison data column according to the numerical value of the ith scheme at the Kth influence factor; S2,determining a reference data column by adopting an expert analysis method; and S3, calculating the correlation number of the data column of the influence factors of each scheme with respect to the reference data column to obtain the correlation degree, wherein the ventilation scheme with the large correlation degree is the optimal ventilation mode. According to the optimal selection, the workingface ventilation system is optimized, so that the optimized ventilation system adapts to the production capacity, meanwhile, the technical requirements of gas extraction and spontaneous combustion fire prevention and control are met, the advanced, reasonable and reliable technology is achieved, the high disaster resistance is achieved, and the ventilation system with sufficient air volume and stable air flow is formed.

The UV surface-cleaning machine is mainly formed of UV light source system, transmission system, exhaust system, safe protection and failure display system, electric control and power supply system. It features reasonable design, simple structure, simple and convenient operation, safe and reliable and good cleaning effect, and its cleaning rate is 2-3 pieces/min. Said machine can be extensively used for cleaning semiconductor device, integrated circuit and liquid crystal display device and printed circuit board, etc. in their production.