Gear pumps introduced
rely on the gear pump Gear pump cylinder and is formed between the volume of work for the transmission of change and movement of the pressurized liquid or the rotary pump.
Double gear pump outside the mesh structure. A pair of mutually meshing gears and the pump cylinder from the inhalation chambers and separated from the cavity. Gear rotation, the inhalation side of the tooth cavity was torn off one another interdental Department gradually increasing volume, the pressure reduced, the liquid under pressure to enter in between teeth. As the gears rotate, a liquid between teeth from cavity was taken to. Cavity from the side when the meshing gear teeth Department diminishing volume, and liquid discharge. Gear pump for conveying solid particles free, non-corrosive, the scope of the larger viscosity of liquid lubrication. Pump flow can be to 300 m 3 / h, pressure up to 3 × 107 Pa. It is usually used for all types of hydraulic pumps and transmission oil. Compact gear pump of simple structure, easy manufacture, easy maintenance, and self-absorption capacity, but traffic, a greater pulse pressure and large noise. Gear pump must be equipped with safety valve to prevent discharges due to some reasons such as congestion control pump outlet pressure to make more than allowed to damage the value of a pump or prime mover.
Gear pump working principle and characteristics are what?
Gear pump working principle and characteristics are what? , Including positive displacement gear pump is a rotary pump, and its working principle is: gear pump with a pair of gears meshing with each other, gear (driving wheel) fixed in active axis, one end of gear pump shaft extending outside the original shell motivation-driven gear pump another gear (the driven wheel) mounted on another shaft, rotary gear pump, the liquid along the oil pipe into the inhalation space, along the upper and lower shell wall, respectively, were squeezed into two gear from space convergence (gear teeth meshing with the former), and then discharged into the pressure tubing. Gear pump is the main features of compact structure, small size, light weight, low cost. However, compared with other types of pumps, low efficiency, vibration, and noise of the shortcomings and easy wear
Gear pump and use the specific structure of
Divided into external gear pump gear pumps and gear pumps.
Gear pump with two different shapes of gear, not the same number of teeth. One for the ring gear, pump body floating in the middle one is the driving gear, and the pump body into a position eccentric. Number of teeth than the ring one more gear teeth, gear driven rotation with ring gear, using the two interdental space for the transmission of liquid. Otherwise within the gear pump is a gear ring gear <BR> more than two teeth, in between the two gears with a fixed partition of the crescent-shaped, the suction space clearly separated from the row. Discharge pressure and flow in the same circumstances, the internal gear pump size smaller than the external gear pump.
Gear pump for conveying a larger viscous liquid, such as lubricants and burning oil, not transmission fluid with lower viscosity (such as water and gasoline, etc.), not transmission fluid containing particles of impurities (the impact of the life of pump), can be used as oil pump lubrication system and hydraulic system pumps, are widely used in engines, steam turbine, centrifugal compressors, machine tools and other equipment. Gear pump technology requirements.
Pump performance parameters
Main flow and lift, in addition to shaft power, speed and necessary cavitation margin. Flow per unit time is the pump outlet through a liquid volume of output, the general volume of traffic; head is the unit weight of carrier liquid from the pump to the export of imported energy increment for the positive displacement pump, energy is mainly reflected the incremental increase in pressure on Therefore, the pressure is usually expressed as the incremental lift to replace. The efficiency of pump performance is not an independent parameter, it can be from other performance parameters such as flow, head and shaft power obtained by the formula. The other hand, are known to flow, head and efficiency, shaft power can also be obtained.
Pump between the various performance parameters, there was some change in the relationship between interdependence can be tested on the pump were measured and calculated parameter values, and painting into a curve that the curve is called the pump characteristic curve. Each pump has the characteristics of a particular curve, provided by the pump manufacturer. Usually given in a factory on the characteristic curve also indicate the performance of recommended section, known as the scope of work of the pump.
The actual pump operating point of the curve by the pump device and the pump characteristic curve to determine the point of intersection. The choice and use of pumps, pump should be the operating point falls within the scope of work to ensure the functioning of the economy and security. In addition, the same pump different transmission fluid viscosity, the characteristic curve will change. Typically, the pump to the factory by the characteristic curve is the most clean and cold water at the time of transfer characteristic curve. The pump power, with the liquid viscosity increases, reducing lift and efficiency, shaft power increases, so the industry sometimes heated liquid viscosity so that smaller viscosity in order to improve transmission efficiency.