Gear pump
Chine Name: 缮写gear pump
Name: gear pump
Definition: rely aled in a housing of two or more gears, 山东大学考研成绩查询the work space is generated禁止洋垃圾入境 in the process of mutual engagement volume change to liquid delivery pump.
Applied disciplines: mechanical engineering (a subject); drive (anatomietwo walk什么意思subjects); hydraulic transmission (two subjects)
The gear pump is to rely on the change and moving of the working volume of the pump cylinder and the ring gear formed between rotary pumps for conveying liquid or so pressurized. Form two clod space by two gears, pump, front and rear cover, when the gear is rotated, the gear is dingaged from the side of the space volume grew larger, forming a vacuum, the liquid suction, the gear meshing side of the volume of the space from large small, while the liquid squeeze into the pipeline to go. The suction chamber and t
he discharge chamber is spaced by two gears meshing line to. The outlet pressure of the gear pump is entirely dependent on the size of the pump source resistance.
The concept of the working principle of the gear pump is very simple, i.e. in its most basic form is the same as the two dimensions of the gear in a clo fit within the housing.
updatingThe engagement rotation, the interior of the housing is similar to the "8" shape, the two gears are mounted on the inside, the outside diameter of the gear, and both sides of the housing clo fit. From the extruder, the material in the suction port into the middle of the two gears, and to fill this space, the rotation direction of the housing with the teeth movement, and finally discharged in the two toothing.
图书馆英语Speaking in terminology, gear pump, also called a positive displacement device, i.e. as a cylinder bore of the piston, when one tooth into the fluid space of another tooth, the liquid is mechanically squeezed row out. Becau the liquid is incompressible, so the liquid and the tooth at the same time can not occupy the same space, so that the liquid has been excluded. This phenomenon continuously occurs due to the continuous engage
ment of the teeth, and, therefore, at the outlet of the pump provides a continuous excluded volume pump per revolution, the same amount of discharged. With the uninterrupted rotation of the drive shaft, the pump also continuously discharged fluid. The pump flow is directly related to the speed of the pump.
车阵
In fact, in a pump with a small amount of fluid loss, which makes the efficiency of the operation of the pump can not reach 100%, becau the fluids are ud to lubricate bearings and gears on both sides, and the pump body can never be a clearance fit, so can not make 100% of fluid from the outlet, so a small amount of fluid loss is inevitable. However, the pump or can run well, can still reach an efficiency of 93% to 98% for most of the extrudate,.
heartacheViscosity or density changes in the process fluid, the pump will not be much of an impact. If there is a damper, for example in the outlet side accommodates a strainer or a limiter, the pumps will push fluid through them. If the damper changes in their work, i.e., if the filters become dirty, clogged, or the back pressure of the limiter, the pump will continu
e to maintain a constant flow rate, until the device of the weakest parts of the mechanical limit is reached (usually equipped with a torque limiter).
mates The rotational speed of a pump, in fact, is limited, which mainly depends on the process fluid, and if the transmission is oil, the pump can be rotated at high speed, but when the fluid is a high viscosity of the polymer melt body, this restriction will be substantially reduced.
Promote the highly viscous fluid to enter the intake port side of the two tooth space is very important, if this space is not filled, then the pump would not discharge the flow of accurate, so the value of PV (pressure x velocity) is another limiting factor, and is a process variable. Becau of the limitations, the gear pump manufacturer will provide a range of products of different specifications and displacement (for each revolution of the amount discharged). The pumps will be compatible with the specific application process to make the system optimal capacity and price.
PEP-II of the pump gear and shaft are of integrally quintana hardened process, to obtai
n a longer working life. "D" type bearing a combination of forced lubrication mechanism, so that the polymer via a bearing surface, and returns to the inlet side of the pump, in order to ensure effective lubrication of the rotation shaft. This feature reduces the possibility of retention and degradation of polymers. Precision machining of the pump shaft exact fit, to the bearings and gears of the "D" type can ensure that the gear shaft is not eccentric, to prevent the gear wear. The Parkool aled structure with PTFE lip al a water-cooled aled together. Such als do not actually touch the surface of the shaft, its aling principle is that the polymer is cooled to a mi-molten state and form a lf-aling. May also be ud Rheoal aling it in a rever spiral groove al sheet processing, the polymer can be anti presd back imported. For ea of installation, the manufacturer to design an annular bolt mounting surface to enable the flange installation cooperating with other devices easier, which makes the manufacture of the cylindrical flange.
