RU190564U1 - Axial flow control valve - Google Patents

Abstract

The utility model relates to pipeline valves, designed to regulate the flow of gas or pressure in the discharge pipelines. The axial flow control valve comprises a housing (1) with inlet (2) and outlet (3) nozzles and a fairing (4) placed inside the housing with the formation of a through-passage channel (5). The output part of the channel (5) is blocked by a perforated holes (7) with a separator (6). The separator (6) is rigidly connected to the saddle (8). The saddle (8) is fixed in the outlet pipe (3). Inside the separator (6) the piston (10) is mounted with the possibility of axial movement. The piston (10) is attached to the driven rail (15) of the rack mechanism, the driving rod (13) of which is connected to the drive. The cavities (22) of the helical engagement and the end of the drive rod (13) are isolated from the pressure of the working medium. The cavity of the end face of the driven rail (15) communicates with the cavity of the piston (10). On the interacting surfaces of the drive rod (13) and the driven rod (15) of the helical gearing, a coating is applied. The surfaces of the drive rod (13) and the driven rack (15) of the rack mechanism, the surface of the guide bush (16), which limits the movement of the rack (15), as well as the inner surface of the separator (6) and the piston surface (10) interacting with it are strengthened by ion carbonitriding in an ion-plasma installation to a depth of at least 0.15 mm with a hardness of the surface layer of more than 650 HV. Improves the reliability of the design of the valve control axial flow. 2 Il.

Description

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

Known axial control valve, comprising a housing with inlet and outlet nozzles and a fairing placed inside the housing with the formation of an annular channel, the output of which overlaps the separator perforated with holes rigidly connected to the seat fixed in the outlet nozzle and placed inside it with the possibility of axial movement of the piston mounted on the driven rail rack mechanism, the leading rod of which is connected to the drive, the cavity of the rack mechanism and the end of the drive rod are isolated from the pressure I work environment, and the cavity of the end of the driven rod communicated with the piston cavity, a seal that includes a ring of material with low friction coefficient (patent RU №165850 U1, IPC F16K 1/12, F16K 47/08, F16K 39/04, priority from 16.09 .2015, published on 10.11.2016).

A disadvantage of the known valve is that the drive rod and the driven rail are used without any hardening of the interacting surfaces. When the shutter moves in the rack and pinion mechanism during operation, under the action of a high load, scoring will occur. In this case, the number of burrs in the process of work will increase. The presence of burrs on the working surfaces of the teeth of the rack and pinion mechanism will increase the load on the drive. In addition, scratches may occur on the cylindrical surface on the side of the free end of the driven rod, due to the presence of mechanical impurities in the working environment, which will adversely affect the tightness of the stuffing box. All this greatly reduces the reliability of the valve.

The closest in technical essence and the achieved result to the claimed axial flow control valve declared as a utility model is an axial flow valve comprising a housing with inlet and outlet nozzles and a fairing inside the housing to form an annular flow passage, the outlet part of which separates the perforated separator, rigidly connected to the saddle fixed in the outlet nozzle and the piston placed inside the separator with the possibility of axial movement, The wheel drive gear and the end of the drive rod are isolated from the pressure of the working medium, and the cavity of the end of the driven rod communicates with the piston cavity on the interacting surfaces of the drive and driven rods of the gear-rack mechanism coated. Molybdenum is used as a coating for interacting surfaces of a gear-rack mechanism (RU patent No. 174792 U1, F16K 3/30, F16K 3/36, dated January 24, 2017, publ. 11.11.2017).

The disadvantage of the known valve is that after coating with molybdenum on the surface of the driving and driven rods of the rack and pinion mechanism in the zone of their mutual engagement, as well as on a part of the cylindrical surfaces of the rods, it is necessary to carry out an additional finishing treatment. At the same time for the treatment of coated surfaces requires the use of special tools with high hardness. All this leads to a decrease in the reliability of the valve design and an increase in labor intensity in its manufacture.

A technical problem addressed by the claimed utility model is to improve the reliability of the design of the valve regulating axial flow due to the hardening of the surfaces of the heavily loaded valve parts by the method of ion carbonitriding.

The technical result is achieved due to the fact that in the valve controlling the axial flow, comprising a housing with inlet and outlet nozzles and a fairing placed inside the housing with the formation of a bore annular channel, the output of which overlaps the separator perforated with holes fixed to the saddle fixed in the outlet nozzle and placed inside it with the possibility of axial movement of the piston mounted on the driven rail spline gear helical gear, the leading rod of which connect not driven, the helical gear cavity and the end of the drive rod are isolated from the pressure of the working medium, and the cavity of the end of the driven rail communicates with the piston cavity, according to the utility model, the surface of the drive rod and the driven rail of the rack and pinion mechanism, the surface of the guide rail, as well as the inner surface of the separator and the piston surface interacting with it, strengthened by ion carbonitriding in an ion-plasma installation to a depth of at least 0.15 mm with hardness th surface layer of more than 650 HV _0,05.

Surface hardening of the surfaces of the driving rod and the driven rack of the rack mechanism, the surface of the guide sleeve, limiting the movement of the rack rack mechanism, and the inner surface of the separator and the piston surface interacting with it, by ion carbonitriding in an ion-plasma installation to a depth of at least 0.15 mm with a hardness of the surface layer of more than 650 HV _0.05 , eliminates the occurrence of defects on rubbing surfaces, increases the hardness of the surfaces of hardened parts. The high hardness of the mating surfaces provides extreme pressure properties, increases the wear resistance of these surfaces and reduces the wear of the sealing surfaces, which in turn will ensure the tightness of the stuffing box and the main valve stem. Details after performing surface sealing by the method of ion nitriding do not require mechanical processing, which significantly reduces the labor intensity in the manufacture and increases the reliability of the valve.

Axial flow control valve is illustrated by drawings where:

in fig. 1 shows a general view of an axial flow control valve, a longitudinal section.

in FIG. 2, view A in FIG. 1, a sealing assembly is shown located in a housing in front of the separator.

In the drawings, the positions indicated:

1 - body

2 - inlet

3 - outlet pipe

4 - fairing

5 - passage ring channel

6 - separator

7 - radial holes in the separator

8 - saddle

9 - clamping sleeve

10 - the piston

11 - piston cavity

12 - holes in the end of the piston

13 - the leading rod of helical gearing of the rack and pinion mechanism

14 - helical gearing

15 - driven rake spur gear rake mechanism

16 - guide bushing

17 - vertical hole in the sleeve guide

18 - horizontal hole in the guide bush

19 - hole in the housing

20 - movable seal

21 - fixed seal

22 - cavity helical gearing

23 - sealing element

24 - sealing element

25 - fairing

26 - seal

27 - channel

28 - stuffing box

29 - ring groove

30 - ring - sliding bearing

31 - cuff

32 - cuff

An axial-type regulating valve comprises a housing 1 with an inlet 2 and an outlet 3 with nozzles and a fairing 4, forming a through passage annular channel 5 (FIG. 1). At the outlet of the channel 5 is installed a separator 6 with radial holes 7. The separator 6 is fixed by a seat 8 and clamping sleeve 9 in the outlet nozzle 3. Inside the separator 6, the piston 10 is axially displaced communicates with the outlet nozzle 3 cavity through the holes 12, made at the end of the piston 10. The mechanism for moving the piston 10 includes a rack mechanism containing a driving rod 13, which interacts by means of a helical gear 14 with a driven rack 15. Moving the staff 15 of a helical gear 14 og The bushing of the guide 16 is fixed in the cavity of the fairing 4. In the sleeve 16 there are two mutually perpendicular holes 17 and 18. Hole 17 is located vertically in the body, made coaxially with hole 19, made in body 1 in which the driving rod 13 is located. Hole 18 is located horizontally, it has a driven rail 15. The hole 18 between the movable seal 20 and the stationary seal 21 and the cavity of the holes 17 and 19 form a cavity 22 of the helical gear. The cavity 22 is isolated by sealing elements 23 and 24 from the pressure of the working medium. The hole 18 from the side of the free end of the driven rack 1 is isolated by the fairing 25 and the seal 26 from the cavity of the inlet 2 and is connected by channels 27 and the channel of the fairing 4 to the piston cavity 11. A sealing gland 28 is located at the top of the hole in the housing 19. To ensure two-sided tightness of the valve a closed position on the inner surface of the outlet part of the fairing 4 connected to the separator 6 before the radial holes 7, an annular groove 29 is made. 30, having a low coefficient of friction. Ring - bearing 30 is equipped with two cuffs 31 and 32, centers the piston 10 relative to the axis of movement, reduces the load perceived by cuffs 29 and 30 and, due to the low coefficient of friction, reduces the efforts required to move the piston 10. Cuffs 31 and 32 are installed opposite to each other. both sides of the bearing ring 30. The surfaces of the drive rod 13 and the driven rail 15 of the rack mechanism, the surface of the hub of the guide 16, which limits the movement of the rail 15 of the rack mechanism, as well as the inner surface of the separator 6 and the surface of the piston 10 interacting with it are made with surface hardening by the method of ion carbonitriding in an ion-plasma installation to a depth of at least 0.15 mm with a hardness of the surface layer of more than 650 HV _0.05 .

Valve works as follows.

Before assembling the valve, the surface of the drive rod 13 and the driven rack 15 of the rack mechanism, the surface of the guide sleeve, limiting the movement of the rack 15 of the rack mechanism, as well as the inner surface of the separator 6 and the surface of the piston 10 interacting with it, is strengthened by ion-carbonitriding in the ion-plasma unit on depth not less than 0.15 mm with a hardness of the surface layer more than 650 HV _0.05 . Then assemble the valve.

Adjustable medium enters the inlet 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 outlet 3. If you need to reduce the volume of the controlled medium (when closing the valve), the piston 10 through the driven rails 15 and the drive rod 13 of the helical gear 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 openings 7 in the separator 6. With fully blocked Verstov separator valve is closed.

The valve is opened by a drive that sets the driving rod 13, which is connected by helical gearing 14 to the driven rail 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 nozzle 3 due to the presence of holes 12 at the end of the piston 10, reporting these cavities. The piston 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 rail 15 is equal to the pressure in the cavity 11 of the piston 10 due to the presence of the channels 27 and the channel of the fairing 4 that communicate these cavities, and hence the pressure in the cavity of the outlet nozzle 3. The rod 13 is completely unloaded.

The cavity 22 of the helical gear 14 is isolated from the pressure of the working medium by means of sealing elements 20, 21, 23, 24, so that the end of the drive rod 13 is not affected by the pressure of the working medium when the piston 10 is moved. The tightness of the cavity 22 of the helical gear 14 relative to the external environment is provided sealing gland assembly 28. A ring-bearing 30, installed between two cuffs, serves as a centering element of the piston 10 relative to the body, a low-friction sliding bearing, both unloading ensures, efforts cuffs 31 and 32, thereby reducing wear. A constant contact of the sealing cuffs 31 and 32 with the piston 10 is ensured.

The surface of the drive rod 13 and the slave rack 15 rack and pinion mechanism, the surface of the sleeve guide 16, limiting the movement of the rail 15 of the rack mechanism, as well as the surface of the inner surface of the separator 6 and the piston 10 interacting with it, are made with surface hardening by ion carbonitriding in an ion-plasma unit to a depth of at least 0.15 mm with a hardness of the surface layer of more than 650 HV _0.05 . Hardening of surfaces provides high hardness of the mating surfaces, increases their wear resistance and durability and reliability of the valve.

Thus, the result of the improved design of the valve control axial flow is to increase the reliability and durability of the valve design.

Claims (1)

An axial flow control valve comprising a housing with inlet and outlet nozzles and a fairing placed inside the housing to form an annular flow channel, the output of which overlaps the separator perforated with holes rigidly connected to the saddle fixed in the outlet nozzle and the piston placed inside it with the possibility of axial movement mounted on the driven rail of the rack and pinion mechanism of the helical gearing, the driving rod of which is connected to the drive, the cavity of the helical gearing and the end face in The driving rod is insulated from the pressure of the working medium, and the cavity of the end of the driven rail communicates with the piston cavity, characterized in that the surface of the drive rod and the driven rail of the rack and pinion mechanism, the surface of the guide hub, which limits the movement of the rail of the rack and pinion mechanism The surface of the piston is strengthened by the method of ion carbonitriding in an ion-plasma installation to a depth of at least 0.15 mm with a hardness of the surface layer of more than 650 HV _0.05 .

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