Vacuum self suction pumps for the negative pressure initiated, launched before using vacuum pump will pump and a water suction pipe of the air out and filled with water to Huafa pump, pump initiated close valve is initiated. Other to ensure vacuum self suction pump group pumping centrifugal pump normal absorption of energy, two vacuum pump pumping volume (Q=2m3/-10m3/min ranged according to the length of the pipe size practice my company technical staff can be for your selection, V (vacuum) = ~ 200hPa).
Vacuum self suction pump group water pump and a pipeline system control can be gathered at the water intake pump station operator control, also can be in operation on the spot. Anhui Wolong pump pump pump end automatic interlock (standby pump automatic operation is a pump fault,). Vacuum pump, water intake pump can end automatically programmed control pump initiated; normal stop the pump. At the exit of the pump by the electric butterfly valve complete with close to chain automatically stops the pump.
1) the pump is installed in the horizontal, and the pump and the motor are installed on the same base.
2) Bo Yu supply of pump function curve, in the range of planning conditions of flow, lift, power and do not allow negative error, and lift the error should not exceed 5%, the head flow curve from the planned flow to zero flow between should be gradually increased, water pump structure plan should be to account for 20% of speeding the condition of motor. When the pump is operating at rated condition, the power should be in the best power range.
Because when the vacuum self suction pump group water intrusion caused the pump reversal, the rotating speed of the arrived at 120% of rated speed, pump and motor is not endangered. Pump (motor) in the pump does not exceed 20% of the rated speed of the pump can be started.
3) the Q ~ H curve of the pump of the vacuum self suction pump group is necessary to rise from the point of the planning point to the closed lift point smoothly. The closure head should be greater than the planned point head, pump curve can be satisfied with the system resistance in any case.
Vacuum self suction pump pump group in various conditions (including pump in closed head and reversal) episodes of horizontal and vertical forces and moments. In addition, they should also include due to earthquake and temperature changes resulting in the force and moment, by the pump body bear the base transferred to the water pump base.
5) vacuum suction pump water pump bearing and sealing equipment selection without pre lubrication start, without external water supply lubricating structure type and allow transient dry initiated. Water pump lubrication required after the launch will be extracted from the outlet pipe of the pump, filtered lubrication / cooling water pump bearings and seal equipment. Sealing body of pump mechanical seal.
6) vacuum self suction pumps pump normal operation and need to pump with outstanding function of cavitation, and ensure not to attack the cavitation, vibration representation.
Vacuum self suction pumps pump material: pump body is made of cast iron, pump bearing selection of fine imported SKF and impellers are made of corrosion resistant 304 stainless steel materials, the other by the seller according to the conventional material selection.
8) the pump casing of the vacuum self priming pump group should be matched with the automatic exhaust valve.
9) vacuum self priming pump group between pump and motor selection of rigid coupling, coupling should supporting removable solid protective cover.
(10) indoor settling, protection class IP54. Cooling method selection of self fan cooling.
(11) the suitable position of the electric motor enclosure shall be grounded.
(12) wire earthing equipment should be installed in the motor main terminal box.
(13) the motor should have F class insulation rating (temperature check according to B), the junction box protection class is at least IP55.
(14) the bearing structure of the motor should be sealed, can prevent dirt and water, and can not make the lubricant into the coil.
(15) motor housing and motor block should have anti rust measures.
(16) the critical speed of the shaft should be at least 25% greater than the rated speed.
3.2.7 equipment noise levels should follow the rules of the industrial enterprise planning standards of cleanliness "in from the water pump shell level 1.0m, at the height of 1.2m noise value should not exceed 85dB (a).
3.2.8 vacuum self ceiling pumps pump maximum vibration amplitudes of limit value, vibration measurement methods and should be consistent with the current standards.
