SU377054A1 - - Google Patents

Description

The invention relates to a piston-spool valve-type safety clan, operating automatically depending on the flow rate of the fluid and the pressure of the hydrostatic column in the pressure pipe. In order to prevent the destruction of the working body in it, it has a hydraulic shock absorber.

Known safety clans with Pressure to dampen the speed of movement of the working body.

The proposed clan differs from the known ones in that its hydraulic shock absorber is a cylindrical hollow bushing provided with a ring flange with through holes coaxially with through channels in the body of the spool bushing, and the transition from the main cavity of the hydraulic shock absorber to the calibrated bore is made along a beveled surface.

This ensures a sufficient flow of the working medium under high pressure conditions and prevents the deposition of mechanical impurities and paraffin in the cavity of the hydraulic shock absorber sleeve near the calibrated orifice.

The drawing shows the proposed valve, a longitudinal section.

The valve is typically located at the top of the pump. The valve has a valve /, a valve 2 bushing, a stepped valve 3 without cavities, a valve 4 bushing and a hydraulic shock absorber 5. The bushing 2 has symmetrical slots for the passage of fluid and for reducing the force acting on the valve upwards, and the bushing 4 has channels 6 for the passage of pumped liquid and drain holes b, communicating with the grooves in the sleeve 4 i with the holes r in the valve root. Sleeves 2 and 4 are made

0 quick-detachable, and separating rings 7 are used to separate the cavities with different pressures.

The hydraulic shock absorber with the aim of eliminating deposits of aarathia and mechanical impurities in the internal cavity / 1 at the calibrated orifice has a shorter, for example, conical surface 8. Between the end face of sleeve 4 and shock absorber 5, circular or other channels 9 are provided that provide sufficient liquid passage for elimination of pressure lag between the I and L pills.

Flow of pumped fluid

5 raises the shutter 1 of the safety valve, which, moving in the calibrated bushing 2, moves the stepped slide 3 to the position when the drain holes b and d overlap with the thickened part of the choke.

The greater the speed of movement of the spool when starting the pump is quenched by hydraulic am. 5; the fluid from the cavity L is displaced by the valve through a calibrated orifice d and the gap between the valve and the inner surface of the shock absorber cylinder. The shock absorber 5 reduces the spool speed and prevents it from being hit and broken. The pumped liquid pushes the drain holes blocked by the spool and flows through channels 6 to the hollow B and then to the pressure pipes.

Thus, the valve 3 moves in the sleeve 4 in one direction by the shutter 1 depending on the flow rate of the fluid, and in the other direction by the pressure of the fluid in the cavity B.

The ori output of the pump to the reservoir, for example, the well, the valve / and the spool 3, is IB at its lowest position, as shown in the drawing. In this case, the fluid from the well enters through the openings g, the cavity A, the openings b, the annular channels 9 into the cavity B and into the pipeline. Starting the pump is facilitated.

If, for any reason, the pump's fluid supply decreases, the vatvor's lifting force / decreases, and with a constant hydrostatic head, the force acting on the spool towards the flow of the liquid remains constant and exceeds the force acting in the direction of the descendant of the liquid. Then the slide valve opens the drain holes, and the pump is idling. In this case, the working bodies of the pump are protected from dry friction.

After a sufficient amount of fluid is supplied to the pump intake, the shutter / and 80LOTNIK 3 WHO (Spin to the extreme upper position, and the flow to the surface is restored.

In the same way the valve resets

fluid in the tank when the pressure rises above normal and protects the pipes and pump assemblies from destruction. After stopping when raising the pump with pipes, the spool and the valve are lowered to the surface, and the liquid from the pipes is poured into the well.

Subject invention

Claims (2)

1. A safety valve, mainly for submersible screw electropumps, which is a floating valve placed in the housing, moving in a guide sleeve with slots and acting on a stepped spool moving in a spool bushing with through channels parallel to the spool, side grooves and an annular external bore that coincides with the bore and holes in the valve body, and the speed of movement of the gold is absorbed by the shock absorber, characterized in that the passage of the working medium into the column of pressure pipes, as well as excluding the deposition of mechanical impurities and paraffin, the hydraulic damper of the valve is a cylindrical hollow bushing; through hole flange with through holes, coaxial through channels in the body of the spool bushing, and the transition from the main cavity of the hydraulic shock absorber to the calibrated. I hole is made on a rolled surface. 2. | Valve according to claim 1, characterized in that In order to eliminate the pressure drop occurring in the hydraulic shock absorber cavity when a high-speed working medium passes through the through-holes of the sleeve flange, arbitrary shape channels with an area of at least twice the cross-sectional area of the slide are made between the end face of the spool sleeve and the hydraulic shock absorber.