RU2200342C2 - Hydraulic liquid-flowrate regulator - Google Patents

Abstract

FIELD: instrumentation engineering; liquid flowrate regulation; controlling delivery of centrifugal pumps. SUBSTANCE: hydraulic flowrate regulator that may be used in oil extraction process when oil is pumped into well has flexible body, case with flanges and branch pipe for feeding liquid to flexible-body interior and its clamps; flexible body is made in the form of union-diaphragm which in longitudinal section is shaped as central part of hollow toroid-like member having oviform profile and wall thickening from center to periphery and terminating at periphery in dovetail-like section; toroid-like member is provided on one end with fittings in the form of contracting ring whose top is coupled through monolithic joint with ring fixed within case by means of peripheral section of fittings, spacer sleeve, and clamp made in the from of diffusing ring; regulator case is provided with additional pipe connection incorporating high-pressure valves providing its communication with measuring instruments mounted in spaces upstream and downstream of diaphragm, respectively. EFFECT: enhanced reliability and measurement accuracy, reduced pressure loss; enlarged functional capabilities. 2 dwg

Description

 The invention relates to the field of instrumentation, and more specifically to means designed to control the flow of fluid, and can be used in oil production when pumping fluid into the well and to control the performance of centrifugal pumps.

 A known flow regulator, consisting of a housing, an elastic tube, measuring and auxiliary chokes, the inner cavity of the elastic tube is in communication with the cavity behind the measuring choke, and the outer one with a chamber between the auxiliary chokes installed on the auxiliary stream (1).

The disadvantages of this regulator are:
- the impossibility of regulating small liquid flow rates;
- low accuracy of measuring the volume of fluid flowing through the gap between the body and the elastic body.

 Also known is a flow regulator of liquid and gaseous substances, selected as a prototype, consisting of a body filled with an elastic body, a flow divider, a control pressure line and a retainer (2).

The disadvantages of this design include:
- the unsuitability of such a device for regulating low liquid flow rates due to the significant gap formed between the body and the elastic body after inflating it to a maximum value;
- poor accuracy of measuring the volume of fluid flowing through the gap between the body and the elastic body in the established mode, due to the fact that the elastic body has the ability to oscillate relative to the longitudinal axis, reducing the gap on one side of the body and increasing it on the other, which leads to disruption of the velocity diagram flow, therefore, to a change in fluid flow through the flow regulator;
- the complexity of manufacturing, due to the design of the elastic body, fastening nodes and node supply of the main fluid into the cavity of the elastic body.

 The objective of the invention is to increase the reliability of the hydraulic fluid flow regulator, reduce pressure loss and improve measurement accuracy, as well as increase versatility.

The technical solution of the task is carried out using the proposed hydraulic fluid flow regulator:
- due to the implementation of the throttling hole, smoothly passing into the hole of the passage section of the housing, and the possibility of washing the throttling hole by inflating its wall, the reliability of the hydraulic fluid flow controller increases;
- due to the smooth transition of the throttling hole into the bore of the housing cross section, a sharp decrease in pressure loss occurs;
- high accuracy of flow control is achieved due to the smooth transition of the bore of the housing cross section into the throttle hole, and then again into the bore of the housing cross section;
- increased versatility occurs due to the choice of the design of the diaphragm forming the throttle hole, and the possibility of changing the diameter of the throttling hole due to the release of fluid from the submembrane cavity or its pumping into this cavity.

 The technical result is achieved in that the hydraulic fluid flow regulator includes an elastic body, a housing with flanges and a pipe for supplying fluid into the cavity of the elastic body and its clamps.

 The elastic body is made in the form of a fitting diaphragm, which is a longitudinal section in the form of the central part of the hollow toroidal element with an egg-shaped profile and a thickening wall from the center to the periphery, ending on the periphery with a dovetail-shaped section, and equipped on one side with reinforcement made in the form a confuser ring, the apical portion of which is monolithically connected with it, pinched in the housing with the help of the peripheral portion of the reinforcement, the spacer sleeve and the clamp, made in the form of a diffuser ltsa.

 The housing of the hydraulic fluid flow regulator is equipped with additional nozzles with high-pressure valves, which respectively communicate the diaphragm and pre-diaphragm cavities with measuring devices.

 In FIG. 1 shows a longitudinal section through a hydraulic fluid flow regulator.

 Figure 2 - fragment of the regulator with valves and manometers.

 The proposed hydraulic fluid flow regulator consists of a housing 1, in which an elastic body is placed in the form of a diaphragm fitting 2, an expansion sleeve 3, a diffusion pressure ring 4. The housing is equipped with connecting flanges 5 and 6, nozzles 7, 8 and 9. In addition, in the hydraulic the fluid flow regulator provides a locking 10 and a sealing ring 11.

 The diaphragm fitting 2 is provided with a confuser ring 12 vulcanized into the body 12. The nozzles 7, 8 and 9 (Fig. 1) are equipped with high-pressure valves 13,14 and 15 and exemplary pressure gauges 16, 17 and 18 (Fig. 2), respectively.

 The diaphragm fitting 2 on the periphery has thickened sections made in the shape of a dovetail, clamped by the details: clamping diffuser ring 4, confuser ring 12 and spacer sleeve 3. The connection of these parts is a lock.

 A hydraulic fluid flow regulator is installed between sections of the main pipeline.

 The operation of the hydraulic flow controller proceeds as follows.

 When the high pressure valve 14 is open, frost-resistant liquid is pumped through the nozzle 9 into the cavity "a" by the dosing pump (not shown in the drawing). The injection volume is controlled by standard gauges 17 and 18. The pumped liquid from the main pipeline 19 enters the pre-diaphragm cavity “b” and presses on the front wall of the diaphragm nozzle 2. This pressure is transmitted to the frost-resistant liquid and through it to the rear wall of the diaphragm nozzle 2, therefore, on its reinforcement - a confuser ring 12.

 The pumped liquid from the cavity "b" is sent to the cavity of the throttle hole "c", undergoing strong compression, and goes into the cavity "g" of the confuser portion of the diaphragm fitting 2. Here, the speed of the pumped liquid gradually decreases and then it continues along the main pipeline 19. The transition of fluid from the cavity of the throttle hole "in" to the confuser cavity "g" proceeds without cavitation phenomena. If it is necessary to reduce the flow rate, the action is repeated in the reverse order.

 If it is necessary to increase the flow rate of the transported fluid, part of the volume of the frost-resistant fluid is discharged from the cavity “a” of the diaphragm fitting 2, opening the high-pressure valve 14. In the event of a decrease in flow, the metering pump, when the high-pressure valve 14 is open, serves frost-resistant liquid in the cavity “a” "nozzle diaphragm 2. The required volume of fluid pumped into the cavity" a "and pumped out of it is controlled by a standard pressure gauge 17, and by the model pressure gauges 16 and 18 indirectly judge the flow rate of the transported liquid tee.

The use of a hydraulic fluid flow regulator will allow:
- to regulate small liquid flow rates due to the appearance of the possibility of performing a throttle hole negligible and the possibility of increasing it in the necessary (required) intervals;
- to improve the measurement accuracy by eliminating cavitation phenomena during the passage of fluid through the nozzle diaphragm and keeping the throttle opening cross section unchanged under pressure fluctuations in the main pipeline.

References
1. USSR author's certificate 226876, G 05 D 7/01 "Flow regulator", 1968

 2. USSR author's certificate 251848, G 05 D 7/01 "Regulator of the flow of liquid and gaseous substances" - prototype.

Claims (1)

 A hydraulic fluid flow regulator, including an elastic body, a housing with flanges and a pipe for supplying fluid to the cavity of the elastic body and its clamps, characterized in that the elastic body is made in the form of a diaphragm-fitting, which is a longitudinal section of the shape of a hollow toroidal element with an egg-shaped profile and a thickening wall from the center to the periphery, ending on the periphery with a dovetail lock, and equipped on one side with reinforcement made in the form of a confuser ring, the vertex portion the window of which is integral with the diaphragm pinched in the housing using the peripheral section of the valve, spacer sleeve and clamp made in the form of a diffuser ring, the regulator body being equipped with additional nozzles with high-pressure valves, which respectively communicate the diaphragm and pre-diaphragm cavities with measuring devices.

Images