30results about How to "Reduce negative pressure loss" patented technology

The invention relates to an agricultural seeding device, in particular to a suction type precision seed bunch planting device. The suction type precision seed bunch planting device mainly comprises a seed tank (26), a suction type seed sorter, a roller, a negative pressure air suction pipe (6), a speed shifting mechanism and a seed receiving and delivering device, wherein the suction type seed sorter is arranged in the roller and communicated with the negative pressure air suction pipe (6); a seed delivering box (47) is arranged between a seed outlet of the suction type seed sorter and a duck nozzle (42); a main shaft (4) of the roller is a hollow pipe; a main shaft (9) of the suction type seed sorter is arranged in the hollow pipe-shaped main shaft (4) of the roller; one end of the main shaft (9) of the suction type seed sorter is coupled to the suction type seed sorter through a bearing (8.1) and drives a seed suction disk (33), and the other end of the main shaft (9) of the suction type seed sorter passes through a sealing bearing (8) in the main shaft (4) of the roller; the main shaft (4) of the roller and the main shaft (9) of the suction type seed sorter are in speed-shifting connection through a gear or a chain or a notched belt. The suction type precision seed bunch planting device has the advantages of increasing the inner space of the roller as much as possible, increasing the height of the seed delivering box simultaneously, conveniently regulating the rotating speed ratio of the roller to the seed absorption box according to the agronomic requirements, and greatly improving the seeding speed while seeding accurately. Due to the unique transmission structure, the suction type precision seed bunch planting device is compact and steady, and the fault rate is reduced obviously under the environment of worse working condition.

The invention discloses a range hood with a movable smoke guide plate and a control method thereof. An installation cavity is formed between a fan frame and a decoration outer cover, a smoke collection cover is installed below the decoration outer cover, a smoke guide plate is installed below an air inlet of the smoke collection cover, a volute positive pressure drainage pipe and a lifting mechanism are installed in the installation cavity, the air inlet end of the volute positive pressure drainage pipe communicates with the interior of a volute of the fan, the air outlet end of the volute positive pressure drainage pipe is connected with a driving mechanism, so that the airflow flowing out from the air outlet end forms a driving source of the driving mechanism, and the smoke guide plate can move relative to the smoke collection cover under the driving of the lifting mechanism. The range hood has the advantages that the airflow led out from the interior of the volute through the volutepositive pressure drainage pipe can be used as a driving source to drive the lifting mechanism, so that the smoke guide plate can move relative to the smoke collection cover, and the motion posture of the smoke guide plate is intelligently adjusted; the moving parts are few, the structure is simple, the cost is low, the disassembly and assembly are easy, the reutilization of airflow inside the volute is realized, and the negative pressure loss of the range hood is reduced.

The invention provides a dust-collection sanitation vehicle. The dust-collection sanitation vehicle comprises a cab, a vehicle frame, an engine power output shaft and a compartment. A draught fan is installed on the vehicle frame. A driving belt wheel is installed on the engine power output shaft. A driven belt wheel is installed on a draught fan spindle. The driving belt wheel is in transmission connection with the driven belt wheel through a belt. The lower portion of the vehicle frame is connected with a main dust collection pipe. The main dust collection pipe is provided with a dust collection port. The main dust collection pipe is connected with an air suction port of the draught fan through a telescopic hose. The compartment comprises a base plate, side plates, a front plate and a tail door. A first dust filtering plate assembly and a second dust filtering plate assembly are detachably connected to the interior of the compartment. The first dust filtering plate assembly is vertically arranged on the tail of the compartment and spaced from the tail door by a certain distance. The second dust filtering plate assembly is horizontally arranged at the top of the compartment. A dust collection cavity used for collecting dust is defined by the base plate, the side plates, the front plate, the first dust filtering plate assembly and the second dust filtering plate assembly. An air inlet communicating with the dust collection cavity is formed in the compartment. An air outlet of the draught fan is connected with the air inlet in the compartment.

The invention relates to a tornado-type suction nozzle and a range hood thereof. The tornado-type suction nozzle and the range hood thereof are characterized in that an air inlet (8) of a shell (4) isconcentrically connected with an impeller lower disk (10); an impeller upper disk (12)and an impeller tongue plate (16) are concentrically fixed; a connecting port (5) of the shell (4) is connected with an oil exhaust fume pipe (3) or a fan (2); the impeller upper disk (12) is larger than the impeller lower disk (10), and the two ends of a unidirectional blade (11) are evenly fixed to the impeller upper disk (12) and the impeller lower disk (10) separately; the impeller upper disk (12) is provided with a tapered shell tongue (18); the cross section of the shell tongue (18) and a gap (20) of the unidirectional blade (11) gradually decreases from top to bottom; and an impeller (9) is a non-rotating cyclone guide wheel, due to the suction by the fan (2), a negative pressure area tornado (23)which is in a constricted funnel shape and perpendicular to the horizontal surface is formed under the tornado-type nozzle (1), and extends to the inner bottom of a pot (24) and sucks oil fume away.The range hood has a long suction distance, large suction power, concentrated negative pressure, simple structure and low noise.

The invention provides a cotton suction branch pipe of a spinning frame. According to the technical scheme of the cotton suction branch pipe of the spinning frame, a plastic round pipe with a smooth inner wall is adopted as the branch pipe, a connecting method of the branch pipe, a branch pipe nozzle and a main air suction pipe is improved, air resistance is reduced, 90-degree airflow disturbance of the branch pipe and the main air suction pipe are eliminated from multiple aspects, the whole branch pipe and connecting points thereof have no cotton accumulating and hanging positions, the airflow transmission efficiency of a cotton suction system is improved, the negative pressure loss is reduced, the maintenance performance is improved, and the device is suitable for new machine application and transformation of stock spinning frames.

The cleaning scraping strip with the water passing structure comprises a dirt collecting device with a dirt collecting groove formed in the bottom, the front side face of the dirt collecting groove is composed of a scraping strip, the dirt collecting groove is connected with a dirt suction assembly capable of generating negative pressure, a dirt collecting channel is formed in the front side face of the scraping strip, and when the scraping strip is pressed downwards to advance, the lower end of the scraping strip is bent backwards; the dirt collecting channel is just located at the lower end of the bent scraping strip and communicates the dirt collecting groove with the space in front of the scraping strip. The problems that when the scraping strip is pressed downwards to move front and back, the flow guide channel is blocked, and water absorption of the scraping strip fails are solved.

The invention relates to a balling-resisting quick change rotary suction nozzle device, belonging to the technical field of spinning machines. The balling-resisting quick change rotary suction nozzle device comprises a horizontally arranged main shaft (1), wherein a suction arm (2) is inserted into the end part of the main shaft (1) and comprises a horizontal section (2.1) and an inclined section (2.2), the end part of the inclined section (2.2) of the suction arm (2) is connected with a suction nozzle (5), and a suction nozzle end surface of the suction nozzle (5) is parallel to the central line of the main shaft (1). According to the balling-resisting quick change rotary suction nozzle device disclosed by the invention, the suction nozzle and the suction arm are of quick connection structures and are very convenient to replace, and the lengths of the suction nozzle and the suction arm can be configured as required; a rubber suction nozzle is sleeved on the suction nozzle so that the suction nozzle does not generate static electricity with a filtering material so as to be capable of effectively preventing the filtering material from balling and hardening and prolonging the service life of the filtering material. The horizontal section and the inclined section of the suction arm are bent into 120 degrees, a diameter range is set, the area of a suction nozzle is large, and the loss of negative pressure is less.