The pump barrel assembly comprises a pump barrel and the pump barrel collar, short and extended tubes'coupling. The pump barrel is the tube well pump the most critical components, with both ends of the thread, wall by surface heat treatment, electroplating or spray welding (ceramic), and then finishing, and ensure high accuracy with the plunger has good wear resistance, and corrosion resistance.
The plunger assembly is composed of an upper oil outlet valve cover, an upper and a lower oil valve ball and a valve seat, a plunger, and a lower oil outlet valve cover. The surface strengthening technology has the chrome plating plunger and the spray welding plunger (ceramic), and the spray welding has the advantages of low porosity, good corrosion resistance and wear resistance, and can be widely used.
The fixed valve assembly is composed of a fixed valve cover, a fixed valve ball, a fixed valve seat and a joint. Fixed valve cover with a screw hole at the upper end, for salvage with fixed valve. Fixed valve locking device is composed of a sealing ring, a mandrel, bearing elastic sleeve bearing. Joint elastic spindle and the upper end of the fixed valve assembly with a threaded connection, and the sealing ring. At the lower end of the elastic opening elastic spindle, through the supporting sleeve in the hole, the elastic opening inward contraction, when the sealing ring is supported on the supporting sleeve within the conical sealing surface, cone surface cone diameter at the elastic opening just to close to the hole in the supporting sleeve, so that the fixed the valve assembly can move up and down. Salvage lift on the fixed valve assembly, elastic opening inward contraction, with the fixed valve assembly together with the salvage.
Fixed valve salvaging device by the salvage body, a guide sleeve, a spring, a pin and a tap type fishing head. The fishing body is respectively connected with the lower part of the plunger out of the oil valve seat by screw threads. The guide sleeve hole is provided with a pin, and a spring tap type fishing head. When fishing fishing head of screw tap type fixed valve cover, the buckle or buckle will remove the fixed valve. A tubular pump with a salvage type fixed valve can be recovered from the fixed valve without the oil pipe, and the operation of the pump can be simplified. But at the same time, it also increases the chance of leakage, and the structure increases the volume of the residual air gap, which is not suitable for the oil well in the high gas oil ratio. Also can salvage the fixed valve flow channel is small, should not be used in the sand and thick oil wells. This condition can be used in the non - salvage pipe type
deep well pump (as shown in Figure 3 - 2). The tube type pump has the advantages of simple structure, low cost, thick wall cylinder bearing capacity, in the same tubing size conditions, can be installed in the pump diameter ratio of rod pump, suitable for high yield wells, can also use off the tube connector is larger than the inside diameter of the tube under the pump. Because of the non salvage type pipe type oil pump, the whole pipeline is needed to check the pump, the operation time is long, the cost is high.
