1.On the oil valve cover fracture. Because the oil valve cover is of special shape, the opening is provided with 3 oil discharging channels, the bearing area is reduced, and the stress is large, so as to select the high strength steel as far as possible in the selection of steel, and the anti-corrosion requirement should be considered. In the process of mechanical processing to take effective measures to prevent stress concentration. When processing the inner and outer concentric as far as possible, to ensure uniform thickness.
2.Pump tube failure. The pump barrel design is relatively mature, as long as the tube design reasonable tail in accordance with the rules of pump selection and in use is generally not the fracture accident of pump tube rupture accident occurred, mine is corrosion and mechanical processing caused by unreasonable.
deep well pump wear caused by clearance is too large or pump barrel pull the leakage loss of excess capacity to form a pump barrel failure, generally take measures to see the pump wear section.
3. Oil inlet valve cover failure. Practice has proved that in the high sunk degree (more than 600m) and large pump (more than 70mm) wells, the oil inlet valve cover at the top of the ball valve is in the frequent occurrence, mainly is the quality of pump valve ball, valve ball, submergence rise speed is high, the valve cover impact energy that exceeded the carrying capacity of oil inlet valve damage. Measures should be taken to improve the anti impact ability of the material, mainly to control the degree of sinking to avoid the impact of excessive damage to the oil valve.
4. Valve ball and valve seat in the
deep well pump parts is a relatively weak link, due to its operating frequency is very high, generally 200 x 104 x 104 x 900 times per year, the greater the pump, the heavier the ball valve, the higher the probability of damage. Common types of damage are:
1). Ball valve fracture is mainly due to the manufacturing of high carbon alloy steel ball, no ball annealing fully before quenching, the carbon molecular is too concentrated, forming a network in the grain boundary, increases the brittleness, and due to the grain boundary carbon enrichment, inevitable grain carbon content is low, therefore, the volume difference the cooling rate and microstructure of grain boundary and grain in quenching of the larger material will have a greater thermal stress, the workpiece is produced when quenching crack. Due to the constant impact, the crack expands rapidly, and finally breaks down. Therefore, in the assembly of the
deep well pump must be carried out on the valve ball in strict detection, in the quenching must be fully before the ball annealing. Two seat plane grinding uneven or warping, installed after the plane pressing force is not balanced, the greater tensile stress of the tee section, in the repeated impact under the action of the seat will be broken.
2). Impact damage by Valve ball and valve seat work long term high frequency impact will inevitably produce indentation and wear, reduce the sealing performance, resulting in the failure of the
deep well pump.
3). Corrosion damage by Valve ball and valve seat for a long time in the corrosion environment, the surface is reduced by corrosion and sealing, resulting in the failure of the
deep well pump.
1). The main form of the pump barrel is excessive deformation of axial bending, hole straightness (requires the pump barrel length per 600mm deviation is not more than 0.06mm) or roundness error caused by the dead plunger. Is generally by manufacturing straightening precision assembly (or the operation must be carried out using friction and friction vise clamp), transportation (must use special vehicle transport, ensure the pump cylinder stress minimum), storage (must have special pump storage rack) and use not strictly enforce the provisions of the.
2). Plunger excessive deformation of the main form:
A. The lower end of the plunger head was not appropriate touch the pump upsetting, the plunger in the pump cylinder lock.
B. The assembly of the plunger thread not clean, tighten the thread, the dirt will cause stuck pump plunger diameter expansion.
C. Store no vertical hanging, long time also can make the plunger horizontal bending.
3). Excessive deformation of the valve seat, the valve seat hardness is not enough, the valve ball in the long-term impact of the sealing surface deformation and leakage.
