RU196436U1 - Axially symmetric control valve - Google Patents

Abstract

A utility model relates to pipe fittings designed to control flow or pressure on discharge pipelines. The axisymmetric control valve comprises a housing (1) with inlet (2) and output pipes (3) and a cowl (4) located inside the housing to form an annular channel. The outlet part of the fairing (4) is blocked by perforated holes (7) by a separator (6). The separator (6) is rigidly connected to the seat (8) fixed in the outlet pipe (3). Inside the separator (6) is placed with the possibility of axial movement of the piston (10). The piston (10) is mounted on the driven rail (15) of the rack mechanism. The leading rod (13) of the rack mechanism is connected to the drive. The piston (10) is made with discharge channels at the end. The helical gearing (14) of the rack and pinion mechanism and the free ends of the driving rod (13) and the driven rack (15) are located in the cavities formed for them, isolated from the pressure of the working medium. Channels for the flow of medium from the side of the end of the driven rack (15) into the piston cavity (10), one of which (27) is made in the form of an annular groove on the outer surface of the guide sleeve (16) at its junction with the fairing plug (25) (4) ) Another channel is made in the form of passage windows (28) in the fairing (4). In front of the separator (6) in the direction of the piston (10), an additional annular groove (30) is made in the body of the fairing (4) with the ring (37) fixedly installed in it from wear-resistant material with a low friction coefficient with the properties of a sliding bearing with the possibility of centering the piston (10) relative to the axis of its motion. In the separator (6), inserts (34) are installed of material with a low coefficient of friction, tightened by screws (35). The separator (6) and the fairing (4) are motionlessly interconnected by means of a pin (38) installed in the coaxial holes in the place of mating of their surfaces. Provides increased reliability of the valve design. 4 ill.

Description

The utility model relates to pipe fittings designed to control flow or pressure on injection pipelines, and can be used in gas and oil pipelines to control the processes of pumping liquid and gas media under pressure.

Known anti-surge axial flow valve comprising a housing with outlet and outlet nozzles, and a cowl located inside the housing, with the formation of an annular channel, the outlet of which is blocked by a perforated cylindrical sleeve in the form of a separator, rigidly connected to the housing and the outlet nozzle and placed in the sleeve with the possibility axial movement inside it, a cylindrical piston mounted on a driven rod of a rack-and-pinion mechanism, the leading rod of which is connected to the drive, the piston is made n with unloading channels at the end, helical gearing of the rack and pinion mechanism and free ends of the leading and driven rods are located in the cavities formed for them, the helical cavity and the end of the driving rod are isolated from the pressure of the working medium, and the cavity of the end face of the driven rod is in communication with the piston cavity ( RU patent No. 103,878 U1, IPC F16K 1/12, priority dated 10/06/2010, publ. 04/27/2011).

However, during the operation of this valve, in accordance with the technical regulations, after a certain time, it is necessary to replace the seals in the piston separator assembly. When replacing the seals, it is necessary to dismantle the separator from the fairing of the housing; after replacing the seals, the separator is installed in its regular place. When installing the separator in the housing, it is necessary to ensure its initial position, however, it is possible that the separator will be installed with a radial displacement relative to the initial position, and tolerances for the manufacture of landing diameters and the shape of the seating surfaces due to altered clearances between the separator and the piston relative to the initial clearances before removing the separator are negative affect valve reliability

When the gaps are changed to a smaller side, an uneven distribution of forces will occur in the annular seals, ensuring the shutter tightness in the closed position, i.e., increased wear of the seals will occur and as a result, the shutter tightness will not be ensured, and an increase in the clearance to the larger side will lead to premature loss of shutter tightness.

The closest technical solution, selected as a prototype, is an axial flow control valve, comprising a housing with inlet and outlet nozzles and a cowl located inside the housing to form an annular channel, the outlet of which overlaps a perforated separator, rigidly connected to a saddle fixed in the outlet , and placed inside it with the possibility of axial movement of the piston mounted on a driven rack and pinion rack, the leading rod of which is connected to water, the piston is made with discharge channels at the end, and the helical gearing of the rack and pinion and the free ends of the drive rod and the driven rack are located in the cavities formed for them, while the cavities of the helical gear and the end of the drive rod are isolated from the pressure of the working medium, an annular groove on the outer surface guide bushings at its junction with fairing plug, additional annular groove with a fixed ring made of wear-resistant material with a low coefficient of friction with the properties of a sliding bearing, made in front of the separator in the direction of the piston in the body of the fairing, through-holes in the fairing, (application No.2019100832 U, IPC F16K 1/12, F16K 1/1226 priority of 10.01.2019, decision to grant a patent of 13.06 .2019 - ours for groove No. 4).

However, in the process of operation of this valve in accordance with the technical regulations, after a certain time, it is necessary to replace the seals in the piston separator assembly. When replacing the seals, it is necessary to dismantle the separator from the fairing of the housing; after replacing the seals, the separator is installed in its regular place. When installing the separator in the housing, it is necessary to ensure its initial position, however, it is possible that the separator will be installed with a radial displacement relative to the initial position, and tolerances for the manufacture of landing diameters and the shape of the seating surfaces due to altered clearances between the separator and the piston relative to the initial clearances before removing the separator are negative affect valve reliability

When the gaps are changed to a smaller side, an uneven distribution of forces will occur in the annular seals, ensuring the shutter tightness in the closed position, i.e., increased wear of the seals will occur and as a result, the shutter tightness will not be ensured, and an increase in the clearance to the larger side will lead to premature loss of shutter tightness.

The technical problem to which the claimed utility model is directed is to increase the reliability of the design of the axisymmetric control valve.

The technical problem is solved by the fact that the axisymmetric axial flow control valve contains a housing with inlet and outlet nozzles and a cowl located inside the housing to form an annular channel, the outlet part of which is blocked by a perforated separator, rigidly connected to the seat fixed in the outlet nozzle and placed inside with the possibility of axial movement of the piston mounted on a driven rack and pinion rack, the leading rod of which is connected to the drive, the piston is made discharge channels at the end, and the helical gearing of the rack mechanism and the free ends of the drive rod and the driven rack are located in the cavities formed for them, the cavities of the helical gear and the end of the drive rod are isolated from the pressure of the working medium, the annular groove on the outer surface of the guide sleeve at the junction with a fairing plug, an additional annular groove with a fixed ring made of a wear-resistant material with a low friction coefficient with bearing properties According to a useful model, the separator and the fairing are fixedly interconnected by means of a pin installed in the coaxial holes in the place of mating of their surfaces, with the possibility of ensuring the exact radial position of the separator in the casing, eliminating changes in the gaps between the piston and the separator and the radial displacement of the separator relative to its original position after reassembling the separator from the casing .

The fixed connection of the separator and the fairing with each other by means of a pin installed in coaxial holes in the place of mating of their surfaces, allows you to determine the radial position of the separator in the housing, eliminates the radial displacement of the separator relative to its original position after reassembling the separator with the housing, and also eliminates the possibility of changes in the gaps between the piston and a separator, which allows you to maintain the initial clearances between the separator and the piston, resulting in increased reliability to axisymmetric control valve design.

The axisymmetric control valve is illustrated by drawings where:

in FIG. 1 - shows an axisymmetric control valve, general view, longitudinal section;

FIG. 2 is a section AA in FIG. 1 shows one of the channels, made in the form of passage windows in the fairing;

in FIG. 3 is a view B in FIG. 1, a pin is shown at the interface between the fairing and the separator;

in FIG. 4 is a view B in FIG. 1, an additional annular groove is shown made in the body of the fairing in front of the separator along the piston with the ring fixed from it made of wear-resistant material with a low coefficient of friction with the properties of a sliding bearing.

In the drawings, the positions indicated:

1 - case

2 - inlet pipe

3 - outlet pipe

4 - fairing

5 - passage ring channel

6 - separator

7 - radial holes in the separator

8 - saddle

9 - clamping sleeve

10 - piston

11 - piston cavity

12 - holes in the piston end

13 - the leading stem helical gearing

14 - helical gearing

15 - driven helical gear rack

16 - guide bush

17 - vertical hole in the guide sleeve

18 - horizontal hole in the guide sleeve

19 - hole in the housing

20 - movable seal

21 - stationary seal

22 - helical cavity

23 - sealing element

24 - sealing element

25 - fairing plug

26 - seal

27 - channel in the form of an annular groove

28 - walk-through windows

29 - stuffing box

30 - ring groove

31 - ring - plain bearing

32 - cuff

33 - cuff

34 - insert

35 - screws

36 - ring groove

37 - plain bearing

38 - pin

The axisymmetric control valve comprises a housing 1 with inlet 2 and outlet 3 nozzles and a cowl 4 forming an annular passage channel 5 (Fig. 1). A separator 6 with radial holes 7 is installed at the outlet of the channel 5. The separator 6 is fixed by a saddle 8 and a pressure sleeve 9 in the outlet pipe 3. A piston 10 is mounted inside the separator 6 with the possibility of axial movement. The cavity 11 of the piston 10 communicates with the cavity of the outlet pipe 3 by means of holes 12, made at the end of the piston 10. The mechanism for moving the piston 10 is made in the form of a rack mechanism and includes a leading rod 13, interacting by means of helical gearing 14, with the driven rack 15. The movement of the rack 15 is limited by the sleeve a guide 16 fixed in the cavity of the fairing 4. Two mutually perpendicular holes 17 and 18 are made in the sleeve of the guide 16. The vertical hole 17 is made coaxially with the hole 19 made in the housing 1, the leading rod 13 is located in them. In the horizontal hole 18 there is a driven rail 15 The hole 18 between the movable seal 20 and the stationary seal 21 and the holes 17 and 19 form a helical gear cavity 22. The cavity 22 is isolated by the sealing elements 23 and 24 from the pressure of the working medium. The hole 18 in the guide sleeve 16 from the free end side of the driven rack 15 is isolated from the cavity of the inlet pipe 2 by a plug 25 installed in the fairing 4 with a seal 26 and connected to the cavity 11 of the piston 10 with two channels 27 and 28 (Fig. 2). One channel 27 is made in the form of an annular groove on the outer surface of the guide sleeve 16 at the junction of it with the fairing plug 25. Another channel is made in the form of passage windows 28 in the fairing 4. Channel 27 and passage windows 28 serve to increase the passage section and flow of the medium in a large volume from the inner space of the guide sleeve 16 and the cavity of the plug 25 into the cavity 11 of the piston 10, as well as to reduce the weight of the valve body 1. For the tightness of the cavity 22 of the helical gearing 14 with respect to the external environment, a stuffing box 29 is located on top of the hole 19 in the housing 1. To ensure two-sided tightness of the valve in the closed position, an annular groove 30 is made on the inner surface of the outlet part of the fairing 4 connected to the separator 6 in front of the radial holes 7 (Fig. 3). A ring is installed in the groove 30 — a sliding bearing 31 having a low coefficient of friction. Cuffs 32 and 33 are mounted opposite each other on both sides of the ring - sliding bearing 31. The ring - sliding bearing 31 centers the piston 10 relative to the axis of movement, reduces the load perceived by the cuffs 32 and 33 and, due to the low coefficient of friction, reduces the forces required to move the piston 10. In the separator 6 along the movement of the piston 10, inserts 34 are made of material with a low coefficient of friction. The insert 34 is tightened with screws 35 (Fig. 3). Inserts 34 with a low coefficient of friction ensure the alignment of the axis of the piston 10, which contributes to an even distribution of the loads on the seals and bearings. To more evenly distribute the loads on the seals and bearings of the insert 34 are located every 15% along the direction of movement of the piston 10 and in diameter every 60 degrees.

In the direction of the piston 10, in front of the separator 6, an additional annular groove 36 is made in the body of the fairing 4 of the housing 1, in which the ring 37 is stationary, made of a wear-resistant material with a low coefficient of friction (Fig. 4) with the properties of a sliding bearing, to ensure centering of the piston 10 relative to the axis of its movement. The separator 6 and the fairing 4 of the housing 1 are fixedly connected to each other by means of a pin 38. The pin 38 is installed in the coaxial holes made in the place of mating of the surfaces of the separator 6 and the cowling 4. The installation of the pin 38 determines the exact radial position of the separator 6 in the housing 1, eliminates the possibility of changing the gaps between the piston 10 and the separator 6, and also eliminates the radial displacement of the separator 6 relative to the original position after reassembly of the separator 6 with the housing 1.

The valve operates as follows.

The adjustable medium enters the inlet pipe 2 and, passing through the annular channel 5 formed by the housing 1 and the fairing 4, through the openings 7 of the separator 6 enters the output pipe 3. If necessary, reduce the volume of the controlled medium (when closing the valve), the piston 10 by means of the driven rack 15 and the leading rod 13 of the helical gearing 14, is shifted by the drive to the right position, blocking the openings 7 of the separator 6. The volume of the passing controlled medium is determined by the number of open holes 7 in the separator 6. When fully closed, Verstov separator valve is closed.

The valve is opened by a drive that sets the motion of the leading stem 13 connected by helical gearing 14 to the driven rack 15, which moves the piston 10 to the left position. The pressure of the working medium in the cavity 11 of the piston 10 is equal to the pressure in the outlet pipe 3 due to the presence of holes 12 at the end of the piston 10 communicating these cavities. The piston 10 is completely unloaded.

The pressure of the working medium in the hole 18 of the guide sleeve 16, formed for the end face of the driven rack 15, is equal to the pressure in the cavity 11 of the piston 10 due to the presence of channels 27 and channel 5 of the fairing 4 communicating these cavities, and, therefore, the pressure in the cavity of the outlet pipe 3 Stem 13 is completely unloaded.

The cavity 22 of the helical gearing 14 is isolated from the pressure of the working medium by means of sealing elements 20, 21, 23, 24, due to which the end face of the drive rod 13 is not affected by the pressure of the working medium when moving the piston 10, and the tightness of the cavity 22 of the helical gearing 14 relative to the external medium provided by the packing gland unit 29.

Two-way valve tightness in the closed position of the piston 10 is provided by a sealing assembly consisting of a sliding bearing ring 31 and cups 32, 33.

The ring 37 with the properties of the sliding bearing, installed along the piston in front of the separator 6 in the body of the fairing 4 in the annular groove 36, serves as the centering body of the piston 10 relative to the housing 1 when moving the piston 10 from the closed position to the open position. The plain bearing 37 provides unloading of forces from the cuffs 32 and 33, thereby reducing their wear.

Thus, the result of the improvement of the axisymmetric control valve design is to increase the reliability and durability of the valve design.

Claims (1)

An axisymmetric control valve, comprising a housing with inlet and outlet nozzles and a fairing located inside the housing to form an annular channel, the outlet of which is blocked by a perforated separator, rigidly connected to a seat fixed in the outlet nozzle, and a piston mounted inside it with the possibility of axial movement on the driven rail of the rack and pinion mechanism, the leading rod of which is connected to the drive, the piston is made with discharge channels at the end, and the helical gear The rack mechanism and the free ends of the driving rod and the driven rod are located in the cavities formed for them, while the helical cavity and the ends of the driving rod are isolated from the pressure of the working medium, an annular groove on the outer surface of the guide sleeve at its junction with the fairing plug, an additional ring a groove with a fixed ring installed in it from a wear-resistant material with a low coefficient of friction with the properties of a sliding bearing, made in front of the separator along the way piston movements in the body of the fairing, through-holes in the fairing, characterized in that the separator and the fairing are fixedly connected to each other by means of a pin installed in the coaxial holes in the place of mating of their surfaces, with the possibility of ensuring the exact radial position of the separator in the housing, eliminating changes in the gaps between the piston and the separator and the radial displacement of the separator relative to its original position after reassembling the separator with the housing.

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