To reduce the engine speed, pull the load handle in the direction of the oil reduction. The amount of oil is reduced and the engine speed is reduced until the oil level is matched to the load. On the surface, it seems that the RAD two-pole and RSV full-speed governors have exactly the same speed-adjusting actions, but they are very different. The difference is that the spring pre-tightening force of the RAD governor is large enough, so there is no automatic speed regulation after the handle of the wrench, that is, there is no dynamic balance between the centrifugal force of the flying block and the governor spring force for the positioning of the sliding sleeve. It can be seen that, in the case of constant engine load, the process of changing the rotation speed is started from the oil volume until the oil volume and load are adapted.
Therefore, the RAD governor is a two-pole governor because it only performs automatic control within the idle and high speed regulation range and does not function within the medium speed range. Under balanced conditions, no matter what kind of external load the engine is subjected to, there should be no force that should be returned to the initial equilibrium position of the engine governor besides changing the load handle. Compared with RSV, the most significant advantage of RAD governor is that the operating force when using the load handle to increase the speed is very small, which is more suitable for road transport vehicles.
When starting and idle speed control of the diesel engine is stopped, the flying block is closed inward under the action of a starting spring, an idle speed spring and a governor spring. In this case, if the load handle is moved to the full load (in contact with the large throttle stopper) position, the rack bar moves to the position where it exceeds the full load to reach the maximum start enrichment level. At this time, if the injection pump or governor is equipped with a rack stopper, the rack bar will move to the stopper (or compress the thickening spring) position.
the high pressure Waterjet Pump is the heart of the whole Water Jet Cutting Machine. It pressurizes the finely filtered water to 300Mpa-400Mpa-620mpa (45000psi-60000psi-90000psi), and then passes through the nozzle to form a jet of about three times of the sound speed, transforming its pressure into concentrated kinetic energy, so as to cut any material.
we now have
1. 380mpa Direct Drive Pump. ( Crankshaft Pump)
2. 420mpa intensifier pump. (60000psi) pump
3. 620mpa intensifier pump. (90000psi pump)
The direct drive pump, also known as the three-cylinder pump, as the name implies, directly drives the crankshaft with three pistons to rotate, resulting in super high water pressure. The design of the direct drive pump originated in the United States, gradually matured and occupied a significant weight in the water cutting industry. More than 20% of the waterjets in the market use direct drive.
The supercharged oil pump is driven by oil pressure to form a larger pressure. The oil pump is formed by ultra-high pressure. Therefore, the fittings are generally made of hard metal, and the failure rate is relatively low in use. The waterjet of the supercharged oil pump is the most widely used waterjet booster type.
In terms of pressure, the pressure of the booster pump is generally higher than that of the direct drive pump, so it can cut a thicker metal material and use a wider surface. Although the water jet of the direct drive pump cannot form such a high pressure, but in the tile More cost-saving in cutting, food, and cleaning operations.
In terms of cost, the water jet of the booster oil pump will need more consumption. The ultra-high pressure operation requires about 30 degrees of electricity per hour. The photoelectric cost is also very large in the month, and the direct drive pump is very economical, every hour. About ten degrees of electricity, only one-third of the cost of pressurized hydraulics. In addition to the cost of the equipment, the hydraulic pressure is much higher than the cost of the direct drive pump equipment.
waterjet pump
Waterjet Pump,Direct Drive Pump, Crankshaft Pump, Water Pump
HARBIN QIAN FAN XI FENG MACHINERY CO.LTD , http://www.waterjetwamit.com