RU2626868C1 - Pneumatic actuator for axisymmetric valves - Google Patents

Pneumatic actuator for axisymmetric valves Download PDF

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Publication number
RU2626868C1
RU2626868C1 RU2016135462A RU2016135462A RU2626868C1 RU 2626868 C1 RU2626868 C1 RU 2626868C1 RU 2016135462 A RU2016135462 A RU 2016135462A RU 2016135462 A RU2016135462 A RU 2016135462A RU 2626868 C1 RU2626868 C1 RU 2626868C1
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RU
Russia
Prior art keywords
piston
pneumatic
hydraulic
pneumatic actuator
actuator
Prior art date
Application number
RU2016135462A
Other languages
Russian (ru)
Inventor
Михаил Григорьевич Басаргин
Иван Вячеславович Святогоров
Мария Олеговна Мартынова
Дмитрий Сергеевич Павлов
Максим Михайлович Семенов
Original Assignee
Акционерное общество "Инжиниринговая компания "АЭМ-технологии" (АО "АЭМ-технологии")
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Priority to RU2016135462A priority Critical patent/RU2626868C1/en
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Publication of RU2626868C1 publication Critical patent/RU2626868C1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072Combined pneumatic-hydraulic systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00Actuating devices; Operating means; Releasing devices
    • F16K31/12Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/14Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves
    • F16K31/143Actuating devices; Operating means; Releasing devices actuated by fluid for mounting on, or in combination with, hand-actuated valves the fluid acting on a piston

Abstract

FIELD: machine engineering.
SUBSTANCE: pneumatic actuator for the axisymmetric valves contains a pneumatic cylinder (1), in the cavity of which there is a piston (6) rigidly connected to the valve stem, hydraulic cylinder (2), elastic elements in the form of springs (5). Springs (5) have the opposite winding direction and are installed through one around the hydraulic cylinder (2) between the piston (6) and the support (3) in an amount of not less than four. The hydraulic cylinder (2) is installed under the piston (6) on the support (3). The piston rod (6) is connected to the valve stem (9). The explosion-proof limit switches (12) and the positioner of the drive mechanisms (13) are attached to the support (3). As a handwheel, a hydraulic system (16) is used, connected by means of a pipeline to the working cavity "G" of the hydraulic cylinder (2). Hydraulic system (16) is simultaneously a hydrodrome.
EFFECT: increasing the reliability of the pneumatic actuator while controlling the valve while regulating the flow and pressure of natural gas in pipelines.
3 cl, 3 dwg

Description

The invention relates to mechanical engineering and can be used to control a valve when controlling the flow and pressure of natural, oil and artificial hydrocarbon gases on pipelines of technological lines, technological piping of compressor stations, booster compressor stations, underground gas storages and gas pipelines, as well as on sections of gas pipelines from regions their extraction, production and storage.
Known pneumatic actuator of the shutoff valve described in patent RU No. 74433 U1, IPC F16K 1/12, priority from 02/04/2008, publ. 06/27/2008, containing a pneumatic cylinder, the stem of which is connected to the valve spindle, a flat cover is fixed on the upper base of the rack, on which a pneumatic valve for supplying compressed air and non-contact end position switches, closed by a casing, are fixed; a handwheel is kinematically connected to a piston located in the internal cavity of the pneumatic cylinder interacting with a return spring.
However, the reliability of the pneumatic drive is reduced due to the fact that this design does not provide damper mechanisms that would smooth out jerks of movement of the rod, which in turn leads to shock when the piston moves to the extreme positions. This phenomenon leads to a more frequent failure of the product and a violation of the initial settings, as well as a disadvantage of the known device are its low performance, lack of protective covers, insufficient ease of use, rotational movements are performed to actuate the piston rod and when using a handwheel.
The closest in purpose, technical essence and the achieved result and selected as a prototype is a pneumatic actuator containing a housing in the form of a pneumatic cylinder, in the cavity of which a piston is placed, rigidly connected to the rod of the actuating element, interacting with elastic elements in the form of springs, support, manual override ( RU patent No. 2075655 C1, IPC F15B 15/00, F15B 13/10, F16K 31/50, priority dated June 29, 1994, publ. March 20, 1997).
However, the reliability of the pneumatic drive is reduced due to the fact that this design does not provide damper mechanisms that would smooth out jerks of movement of the rod, which in turn leads to shock when the piston moves to the extreme positions. This phenomenon leads to a more frequent failure of the product and a violation of the initial settings, insufficient ease of use, rotational movements are performed to actuate the piston rod and when using a manual understudy.
The technical problem to which the invention is directed is to increase the reliability of the pneumatic drive when controlling the valve while controlling the flow and pressure of natural, oil and artificial hydrocarbon gases in pipelines.
To solve this technical problem, in a pneumatic actuator for axisymmetric valves containing a body in the form of a pneumatic cylinder, in the cavity of which there is a piston rigidly connected to the rod of the actuator, interacting with elastic elements in the form of springs, a support, a handwheel, according to the invention, the pneumatic cylinder is equipped with a hydraulic cylinder, mounted under a piston on a support, the rod of which is connected to the actuator, the springs have the opposite direction of winding in an amount of at least four in each direction and are installed through one around the hydraulic cylinder between the piston and the support, to which explosion-proof limit switches are fixed, which fix the end positions of the piston, and a positioner of the drive mechanisms that determines the current position of the actuator rod, while a hydraulic system is used as a handwheel, the elements of which are interconnected by pipelines , which is also a hydraulic damper.
At the same time, the pneumatic cylinder and hydraulic system are equipped with a heating system.
In addition, the elements of the electric network are in the form of explosion protection “flameproof enclosure” and “intrinsically safe electric network”.
The establishment of elastic elements in the form of springs having the opposite direction of winding in an amount of at least four in each direction, and their installation with alternation around the hydraulic cylinder between the piston and the support in the conductors ensures a guaranteed opening / closing of the valve after the gas pressure is released from the working cavity of the pneumatic actuator. This arrangement of the springs prevents the piston from turning around its axis, which eliminates biting and scoring on friction surfaces, as a result of which the reliability of the pneumatic drive increases.
The supply of the pneumatic actuator with explosion-proof limit switches, the input circuits of which, as well as their control information electric cables, having the explosion protection type “flameproof enclosure” and “intrinsically safe electrical network”, provide control over the stop of the actuator stem in the end positions, which affects the drive's performance of its functions during the entire range of work, resulting in increased reliability of the pneumatic drive.
The supply of the pneumatic actuator with the positioner of the drive mechanisms ensures reliable operation of the pneumatic actuator in various modes (control mode, shut-off mode, anti-surge).
The use of a hydraulic system as a manual backup, which is also a hydraulic damper during normal operation of the pneumatic actuator, increases the reliability of the pneumatic actuator in emergency situations, allowing you to quickly respond to deviations in operation, and also ensures smooth movement of the rod during operation of the pneumatic actuator, excluding impacts on the travel limiter, which leads to improving the accuracy and reliability of its work.
Equipping the pneumatic cylinder and the heating system control cabinet in the form of a heating cable allows the pneumatic actuator to be used in areas with critically low temperatures (up to -60 ° C) and to ensure its normal operation.
The invention is illustrated by drawings, where:
in FIG. 1 shows a pneumatic actuator for axisymmetric valves, cross section;
in FIG. 2 is a section AA in FIG. 1, springs having different winding directions are shown, installed through one around the hydraulic cylinder between the support and the piston in the conductor in an amount of at least four pieces of each winding;
in FIG. 3 - pneumatic actuator mounted on an axisymmetric valve, axonometry.
The numbering of pneumatic actuator parts for axisymmetric valves is presented in the following sequence:
1 - case (pneumatic cylinder)
2 - a hydraulic cylinder
3 - support
4 - springs
5 - springs
6 - piston
7 - medium plate
8 - top plate
9 - valve
10 - a rod of a hydraulic cylinder
11 - a casing of the pneumatic cylinder
12 - limit switches
13 - actuator positioner
14 - casing limit switch
15 - protective cover positioner
16 - manual backup (hydraulic system)
17 - control cabinet
18 - heating cable
B - receiver
In - the working cavity of the pneumatic actuator
G - working cavity of the hydraulic cylinder
The pneumatic actuator for axisymmetric valves consists of a housing in the form of a pneumatic cylinder 1 and a hydraulic cylinder 2 attached to the support 3 by means of a bolted connection (Fig. 1). Inside the pneumatic cylinder 1, elastic elements are installed in the form of springs 4 and 5, a piston 6, a middle plate 7, a top plate 8. The springs 4 and 5 have the opposite direction of winding in an amount of at least four in each direction. The springs 4 and 5 of each direction of winding are installed through one around the hydraulic cylinder 2 between the support 3 and the piston 6 in the conductors and provide opening / closing of the actuator, for example, valve 9 after the gas pressure is released in the working cavity of the pneumatic actuator, excluding its twisting during operation (Fig. 2). The piston 6 is rigidly fastened to the rod 10 of the hydraulic cylinder 2. The middle plate 7 is installed in the pneumatic cylinder 1 and is fixed with a lock ring. The working cavity "B" of the pneumatic actuator is limited by the middle plate 7, the piston 6 and the pneumatic cylinder 1. The upper plate 8 is fixed to the pneumatic cylinder 1 using a split ring. The top plate 8, the middle plate 7 and the pneumatic cylinder 1 form the receiver "B". Receiver "B" provides a gas supply with operating parameters to ensure uninterrupted operation of the pneumatic actuator in the event of pressure loss in the supply line. The pneumatic cylinder 1 with internal equipment is protected from the environment by a casing 11, which is attached to the support 3. Explosion-proof limit switches 12 and the positioner 13 of the drive mechanisms, for example, PPM-300, are attached to the side walls of the support 3. Limit switches 12 are used to lock the stop of the rod 10 of the hydraulic cylinder 2 in the final positions. The positioner 13 is used to determine the current position of the rod 10 of the hydraulic cylinder 2. The limit switches 12 and the positioner 13 are also protected from environmental influences by the casing 14 and the protective casing 15, respectively. The pneumatic actuator is equipped with a manual backup in the form of a hydraulic system 16 (Fig. 3), which in case of emergency allows you to smoothly move the valve stem 9 during operation of the pneumatic actuator to the desired position, excluding impacts on the travel limiter. This is achieved by forcing the oil pressure into the working cavity "G" of the hydraulic cylinder 2. The hydraulic system 16 also serves as a hydraulic damper during normal operation. The pneumatic cylinder 1 and the hydraulic system 16, located in the control cabinet 17, are equipped with a heating system, including an explosion-proof heating cable 18. The heating cable 18 is evenly placed around the pneumatic cylinder 1 and the equipment of the control cabinet 17. The heating of the cable 18 is controlled by an explosion-proof box with a thermostat, heating the pneumatic cylinder 1 carried out in a similar manner. Elements of the electrical system are in the form of explosion protection “flameproof enclosure” and “intrinsically safe electrical network”.
The pneumatic actuator operates as follows.
The pneumatic actuator is fixed to the valve 9, the valve stem 9 is rigidly connected to the rod 10 of the hydraulic cylinder 2 by means of a coupling. The highest position of the piston 6 is the normally open state of the valve 9. The lowest position of the piston 6 is the normally closed state of the valve 9. The initial position of the pneumatic actuator is the piston 6 in the upper position. Natural gas through valve 9 enters the pipelines. When a control electric signal (from 4 mA to 20 mA) is supplied to the positioner 13, gas pressure is applied to the piston 6 in the working cavity “B” of the pneumatic actuator, limited by the middle plate 7, piston 6, cylinder 1. Piston 6 starts to move down and compresses the springs 4 and 5 located below it. After applying the maximum pressure, the piston 6 compresses the springs 4 and 5 as much as possible and, having moved 100 mm, abuts against the end face of the hydraulic cylinder 2 and closes the valve 9. When the gas pressure is cut off into the working cavity “B”, the piston 6 under the action of the springs 4 and 5 ( springs open) rises up to its original position, bringing valve 9 to the open state.
When the pneumatic actuator is operated from a manual backup (hydraulic system) 16, in case of an emergency, the hydraulic system is switched to manual control, after which the oil pressure is pumped into the working cavity “G” of hydraulic cylinder 2. Under the action of oil pressure, the rod 10 of hydraulic cylinder 2 is lowered, compressing the springs 4 and 5, causing valve 9 to be closed.
After restoring the normal operating conditions of the pneumatic actuator, the hydraulic system is transferred to automatic control mode, after which the valve 9 is switched to the open state under the action of springs 4 and 5.
Thus, the use of the proposed pneumatic actuator increases the reliability of the pneumatic actuator when controlling the valve while regulating the flow of gases in the pipelines.

Claims (3)

1. A pneumatic actuator for axisymmetric valves, comprising a housing in the form of a pneumatic cylinder, in the cavity of which a piston is placed, rigidly connected to the rod of the actuator, interacting with elastic elements in the form of springs, a support, a handwheel, characterized in that the pneumatic cylinder is equipped with a hydraulic cylinder mounted under the piston on the support, the rod of which is connected with the executive body, the elastic elements have the opposite direction of winding in an amount of at least four of each direction and are installed through one around the guide of logs between the piston and the support to which are attached Explosion Limit switches, locking the end positions of the piston, and the positioner driving mechanisms, which determines the current position of the actuator body of the rod at the same time as the handwheel using hydraulic elements which are interconnected by pipes and which also serves as a hydraulic damper.
2. A pneumatic actuator for axisymmetric valves according to claim 1, characterized in that the pneumatic cylinder and hydraulic system are equipped with a heating system.
3. The pneumatic actuator for axisymmetric valves according to claim 1, characterized in that the elements of the electrical circuit are in the form of explosion protection - flameproof enclosure and intrinsically safe electrical network.
RU2016135462A 2016-08-31 2016-08-31 Pneumatic actuator for axisymmetric valves RU2626868C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2699110C1 (en) * 2019-03-04 2019-09-03 Акционерное общество "Инжиниринговая компания "АЭМ-технологии" (АО "АЭМ-технологии") Pneumatic actuator for axially symmetric valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460152A (en) * 1982-12-15 1984-07-17 Philadelphia Gear Corporation Hand pump with automatic lock-out
RU2073157C1 (en) * 1993-08-06 1997-02-10 Центральное конструкторское бюро арматуростроения Ленинградского научно-производственного объединения арматуростроения "Знамя труда" им.И.И.Лепсе Air-actuated drive
RU2075655C1 (en) * 1994-06-29 1997-03-20 Центральное конструкторское бюро арматуростроения Single-side drive
RU2083903C1 (en) * 1993-03-23 1997-07-10 Воронежский механический завод Air actuator with stabilizer of lateral stability of springs
WO2012121826A1 (en) * 2011-03-08 2012-09-13 Fisher Controls International Llc Bypass arrangement for valve actuator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460152A (en) * 1982-12-15 1984-07-17 Philadelphia Gear Corporation Hand pump with automatic lock-out
RU2083903C1 (en) * 1993-03-23 1997-07-10 Воронежский механический завод Air actuator with stabilizer of lateral stability of springs
RU2073157C1 (en) * 1993-08-06 1997-02-10 Центральное конструкторское бюро арматуростроения Ленинградского научно-производственного объединения арматуростроения "Знамя труда" им.И.И.Лепсе Air-actuated drive
RU2075655C1 (en) * 1994-06-29 1997-03-20 Центральное конструкторское бюро арматуростроения Single-side drive
WO2012121826A1 (en) * 2011-03-08 2012-09-13 Fisher Controls International Llc Bypass arrangement for valve actuator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2699110C1 (en) * 2019-03-04 2019-09-03 Акционерное общество "Инжиниринговая компания "АЭМ-технологии" (АО "АЭМ-технологии") Pneumatic actuator for axially symmetric valve

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