SU1716486A1 - Controlled valve - Google Patents

Abstract

The invention relates to hydro-automatics and can be used in the oil and gas industry. The purpose of the invention is to expand the scope of application by scattering; -., The energy of the workflow. The adjustable throttle consists of a housing 1, the inner of which is placed a plug 2, on V 9. f-4, -, J; H is screwed onto an adjusting rod 3, which is fixed by covers A. On the outer surface of the plug there are open concentric grooves with extensions. The longitudinal grooves associate the last expansion of the previous concentric groove with the first expansion of the subsequent one, as well as the first concentric groove with the fluid inlet into the body, and the last concentric groove with the outlet cavity and the body outlet. As fluid passes through constrictions and grooves, the flow velocity changes dramatically, with the throttle resistance increasing. At the exit from each narrowing, the pressure drop is small, the expansion of the flow is accompanied by intense vortex formation in the zone of separated flow. The resistance of the throttles is changed by the rotation of the regulating rod 3, while the plug 2 is pushed into or out of the outlet cavity. 3 il. CO O) Јъ 00 em 7

Description

The invention relates to technical automatic hydraulics and can be used in the oil and gas industry.

A small-sized throttle device is known, which contains a throttle element 6 inserted into the housing in the form of damping cavities connected by jet nozzles formed on the outer surface of a cylindrical part inserted into the enclosing housing along the landings without a gap.

A disadvantage of a compact throttle device is the lack of the possibility of smooth control of the pressure differential across the throttle and low heat exchange, since the flow moves in one direction, resulting in a lower temperature of the fluid leaving it from the throttles, which leads to an increase in its viscosity. and decrease in the device operability, the closest to the proposed one (according to the technical essence, there is a adjustable throttle consisting of a body, in the cylindrical channel of which eschaets plunger discs, which are made alternating, diametrically opposed nozzles.

The disadvantages of such a throttle are a narrow field of application, since as the workflow moves from the disk to the disk that is close to linear, the energy of the working Flow is practically dissipated.

The aim of the invention is to expand the field of application by dissipating the energy of the workflow.

This goal is achieved by the fact that an adjustable choke, comprising a housing in which a piston is connected between an inlet and an outlet cavity and a piston is connected to an adjusting rod with open concentric channels connected to each other, and the concentric channels consist of successive narrowing and expansions , and the input and output of the concentric channels are located at their ends and each input of the subsequent channel is connected to the output of the previous one.

FIG. 1 shows an adjustable choke, a longitudinal section; in figs. 2 and 3 - sections aa and bb in fig. 2 and 3 respectively.

0 5 0

0

5 Q

five

The adjustable throttle comprises a housing 1, inside of which a stopper 2 is placed, screwed onto the regulating rod 3 with the possibility of moving along it. The stem is fixed by a lid 4. The inner cavity of the housing is sealed with seals 5. On the outer surface of the tube there are open concentric grooves 6 with extensions 7. On the surface of the tube there is a section along the length of the entire generatrix not intersected by concentric grooves. Pre-grooved grooves 8 connect the last expansion of the previous concentric groove with the first subsequent expansion, as well as the concentric groove with the entrance cavity 9 into the housing and the last concentric groove with the output cavity 10 and exit 11 of the housing. The plug in the exit cavity is located with a gap. The outer surface of the tube is lapped to the inner surface of the housing at the point of contact and has a common key with it 12.

I

Adjustable throttle works as follows.

With the passage of fluid through constrictions and expansion of the grooves, the flow velocity changes dramatically, and the drag resistance increases. When exiting from each constriction, the pressure drop is small and therefore the channel diameter can be of acceptable dimensions, and cavitation is also excluded. The total resistance is equal to the sum of all local resistances, and the mutual influence of the entrance and exit of the jet into the concentric groove with this design is excluded. Expansion of the flow is accompanied by intense vortex formation in the zone of separated flow. Due to this, such chokes have a minimal dependence of the resistance on the viscosity of the fluid, g.e. Consumption characteristic is kept stable with fluctuations in viscosity. The resistance of the throttles is changed by the rotation of the regulating rod 3, while the plug 2 is pushed in and out of the cavity of the outlet 10.

The invention expands its range of application by dispersing the workflow and reducing the overall dimensions.

Claims (1)

Invention Formula An adjustable choke comprising a housing in which between the inlet and outlet cavities is installed a plug connected to the regulating rod with concentric channels formed on its surface, connected to each other, characterized in that, in order to expand the area applications due to dissipation of the energy of the working stream, concentric channels are made open and consist of sequentially alternating narrowing and expansions, the input and output of concentric channels are located at their ends, and each input of the subsequent channel is connected to the output of the previous one. A-A 6 FIG. Z