CN213871215U - Double-valve-seat stop valve in steam turbine system - Google Patents

Abstract

The utility model discloses a double-valve-seat stop valve in a steam turbine system, which comprises a valve body, a lifting rod and a lifting mechanism, wherein the valve body is provided with an air inlet channel and an air outlet channel, a valve seat is arranged between the air inlet channel and the air outlet channel, the lifting mechanism is connected with the lifting rod, the valve seat comprises a first valve seat and a second valve seat, the first valve seat is positioned above the second valve seat, a first sealing surface is arranged on the first valve seat, a second sealing surface is arranged on the second valve seat, a valve disc corresponding to the valve seat is arranged on the lifting rod, a first sealing ring and a second sealing ring are arranged on the valve disc, the first sealing ring and the second sealing ring are respectively positioned above the first sealing surface and the second sealing surface, double sealing is realized through the first sealing ring and the second sealing ring, the sealing performance between the valve seat and the valve disc is improved, and the force of the lifting rod can be reduced by adopting the double-seat valve when the lifting rod is lifted or pressed down, the efficiency of the stop valve opening or closing is improved.

Description

Double-valve-seat stop valve in steam turbine system

Technical Field

The utility model belongs to steam turbine valve equipment field, more specifically the double-disk seat stop valve in a steam turbine system that says so.

Background

The stop valve is one of the common valves, and its working principle is that the sealing surface of the valve clack (or valve disc) and the sealing surface of the valve seat are tightly jointed by means of the pressure of the lifting rod, so as to prevent the medium from flowing.

In the steam turbine system, also need to use the stop valve, and cut high pressure high temperature's steam through the stop valve, thereby prevent that steam from getting into inside the steam turbine cylinder body, the stop valve among the prior art adopts and uses single sealed face on the valve disc and the sealing surface laminating on the disk seat to seal, because the inside steam of valve body is high pressure high temperature state, need great power when promoting or pushing down the lifting rod, resistance when opening and closing of valve disc is great promptly, lead to opening or closing inefficiency of stop valve, influence the normal circulation or cut of steam.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a can reduce the lifting force or the overdraft of lifting rod, improve the efficiency that the stop valve was opened or was closed.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a double-disk seat stop valve in steam turbine system, includes valve body, lifting rod and hoist mechanism, be provided with inlet channel and exhaust passage on the valve body, be provided with the disk seat between inlet channel and the exhaust passage, hoist mechanism is connected with the lifting rod, the disk seat includes first disk seat and second disk seat, first disk seat is located the top of second disk seat, be provided with first sealed face on the first disk seat, be provided with the sealed face of second on the second disk seat, be provided with the valve disc that corresponds the disk seat on the lifting rod, be provided with first sealing ring and second sealing ring on the valve disc, first sealing ring and second sealing ring are located the top of the sealed face of first sealed face and second respectively.

Further, a sealing flange is arranged between the first sealing surface and the first sealing ring, a sealing gasket is arranged between the second sealing surface and the second sealing ring, the sealing flange is connected with the first valve seat through a bolt, a gasket groove is formed in the second valve seat, and the sealing gasket is located in the gasket groove.

Further, the valve disc comprises a valve cover and a valve block, the valve cover is connected with the valve block, the first sealing ring is located on the valve cover, and the second sealing ring is located on the valve block.

Further, the lifting mechanism comprises a lifting oil cylinder, and a piston of the lifting oil cylinder is connected with a lifting rod.

Furthermore, a first protrusion corresponding to the first sealing ring is arranged on the sealing flange, and a second protrusion corresponding to the second sealing ring is arranged on the sealing gasket.

Compared with the prior art, the beneficial effects of the utility model are that: when the lifting oil cylinder drives the lifting rod to move downwards, the lifting rod drives the valve disc to move downwards, and when a first sealing ring and a second sealing ring on the valve disc respectively abut against a first sealing surface and a second sealing surface, the circulation of steam between the air inlet channel and the exhaust channel is cut off; and when the piston of the lifting oil cylinder moves upwards, the valve disc moves upwards and is separated from the valve seat, so that steam in the air inlet channel is introduced into the exhaust channel, the circulation of the steam is realized, double sealing is realized through the first sealing ring and the second sealing ring, the sealing property between the valve seat and the valve disc is improved, the force generated when the lifting rod is lifted or pressed downwards can be reduced by adopting the double-seat valve, and the opening or closing efficiency of the stop valve is improved.

Drawings

FIG. 1 is a front cross-sectional view of the double seat stop valve of the present invention when closed;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 1;

fig. 4 is a front sectional view when the shut-off valve is opened.

Reference numerals: 1. a valve body; 2. a lifting bar; 3. an air intake passage; 4. an exhaust passage; 5. a first valve seat; 6. a second valve seat; 7. a first sealing surface; 8. a second sealing surface; 9. a first seal ring; 10. a second seal ring; 11. sealing the flange; 12. a gasket groove; 13. a sealing gasket; 14. a valve cover; 15. a valve block; 16. lifting the oil cylinder; 17. a first protrusion; 18. a second protrusion.

Detailed Description

In the description of the present invention, it should be noted that, for the orientation words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and the positional relationship are indicated based on the orientation or the positional relationship shown in the drawings, and the description is only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and "a plurality" or "a plurality" in the description of the invention means two or more unless a specific definition is explicitly provided.

The present invention is further explained with reference to fig. 1 to 4.

The utility model provides a double-seat stop valve in steam turbine system, includes valve body 1, lifting rod 2 and hoist mechanism, be provided with inlet channel 3 and exhaust passage 4 on the valve body 1, be provided with the disk seat between inlet channel 3 and the exhaust passage 4, hoist mechanism is connected with lifting rod 2, the disk seat includes first disk seat 5 and second disk seat 6, first disk seat 5 is located the top of second disk seat 6, be provided with first sealed face 7 on the first disk seat 5, be provided with the sealed face 8 of second on the second disk seat 6, be provided with the valve disc that corresponds the disk seat on the lifting rod 2, be provided with first sealing ring 9 and second sealing ring 10 on the valve disc, first sealing ring 9 and second sealing ring 10 are located the top of the sealed face of first sealed face 7 and second seal face 8 respectively.

As shown in fig. 1, the first valve seat 5 and the second valve seat 6 are respectively located at the upper and lower sides of the intake passage 3.

As shown in fig. 4, the valve disc is in an open state, high-pressure steam enters the valve body 1 from the air inlet channel 3 on the left side of the valve body 1, and after being divided in the valve body 1, the high-pressure steam is discharged from the air outlet channels 4 on the lower side and the right side of the valve body 1 respectively and enters the steam turbine. As shown in fig. 1, when high-pressure steam needs to be cut off, the lifting rod 2 drives the valve disc to move downwards, when the first sealing ring 9 on the valve disc is abutted against and tightly attached to the first sealing surface 7 on the first valve seat 5, the second sealing ring 10 below the first sealing ring 9 is abutted against and tightly attached to the second sealing surface 8 on the second valve seat 6, so that the air inlet channel 3 is isolated from the air outlet channel 4, and the disc body of the valve disc blocks the high-pressure steam in the air inlet channel 3, so that the high-pressure steam cannot enter the interior of the steam turbine from the air outlet channel 4 any more; when the stop valve needs to be opened again, the valve disc can be driven to move upwards through the lifting rod 2, the first sealing ring 9 and the second sealing ring 10 are enabled to leave the first sealing surface 7 and the second sealing surface 8 respectively, when the second sealing ring 10 leaves the second sealing surface 8, a gap is formed between the second sealing ring 10 and the second sealing surface 8, then high-pressure steam can enter the exhaust passage 4 from the gap, so that the high-pressure steam enters the inside of the steam turbine, and the gap between the second sealing ring 10 and the second sealing surface 8 is increased along with the continuous upward movement of the valve disc, the high-pressure steam flow through the gap is increased, the valve disc is completely opened until the lifting rod 2, and the high-pressure steam can enter the inside of the steam turbine again.

Through the setting of double-valve seat for the power of lift rod 2 when promoting or pushing down the valve disc reduces the power of using when opening or closing the stop valve promptly, improves the efficiency of opening or closing, reduces workman's labour.

As shown in fig. 2 and 3, in the preferred embodiment, a sealing flange 11 is disposed between the first sealing surface 7 and the first sealing ring 9, a sealing gasket 13 is disposed between the second sealing surface 8 and the second sealing ring 10, the sealing flange 11 is connected to the first valve seat 5 by bolts, a gasket groove 12 is disposed on the second valve seat 6, the sealing gasket 13 is disposed in the gasket groove 12, when the valve disc is closed, the sealing flange 11 can bear pressing force from the first sealing ring 9 and gravity from the valve disc itself, so as to reduce damage of the pressure to the first sealing surface 7, and the sealing flange 11 is fixedly connected to the first sealing surface 7 by bolts, so as to facilitate replacement of the sealing flange 11; because when the valve disc is opened, high-pressure steam can pass through the gap between the second sealing ring 10 and the second sealing surface 8, namely the sealing effect between the high-pressure steam and the second sealing surface 8 is improved through the sealing gasket 13, and the sealing gasket 13 is installed through the gasket groove 12, the replacement of the sealing gasket 13 is convenient.

As shown in fig. 1, the valve disc preferred in this embodiment includes a valve cover 14 and a valve block 15, the valve cover 14 is connected to the valve block 15, the first sealing ring 9 is located on the valve cover 14, the second sealing ring 10 is located on the valve block 15, the valve cover 14 is connected to the valve block 15 through a bolt, so that the valve block 15 is detachably connected to the valve cover 14, when the first sealing ring 9 is damaged, only the valve cover 14 needs to be replaced, and when the second sealing ring 10 is damaged, only the valve block 15 needs to be replaced, thereby reducing the maintenance and replacement costs.

As shown in fig. 1, the lifting mechanism of the preferred embodiment includes a lifting cylinder 16, a piston of the lifting cylinder 16 is connected to the lifting rod 2, the lifting cylinder 16 is used to open and close the valve disc, so as to reduce labor force, and meanwhile, the lifting force of the lifting cylinder 16 is reduced by cutting off the double valve seats, so as to improve the service life of the lifting cylinder 16.

As shown in fig. 2 and 3, in the preferred embodiment, the sealing flange 11 is provided with a first protrusion 17 corresponding to the first sealing ring 9, and the sealing gasket 13 is provided with a second protrusion 18 corresponding to the second sealing ring 10, when the valve disc is closed and sealed, the first sealing ring 9 abuts against the first protrusion 17, and the second sealing ring 10 abuts against the second protrusion 18, so that the pressure bearing capacity of the sealing flange 11 and the sealing gasket 13 is improved, and the service life is prolonged.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides a double-disk seat stop valve among steam turbine system, includes valve body, lift bar and hoist mechanism, be provided with inlet channel and exhaust passage on the valve body, be provided with the disk seat between inlet channel and the exhaust passage, hoist mechanism is connected its characterized in that with the lift bar: the valve seat comprises a first valve seat and a second valve seat, the first valve seat is located above the second valve seat, a first sealing surface is arranged on the first valve seat, a second sealing surface is arranged on the second valve seat, a valve disc corresponding to the valve seat is arranged on the lifting rod, a first sealing ring and a second sealing ring are arranged on the valve disc, and the first sealing ring and the second sealing ring are respectively located above the first sealing surface and the second sealing surface.

2. The double seat stop valve in a steam turbine system according to claim 1, wherein: a sealing flange is arranged between the first sealing surface and the first sealing ring, a sealing gasket is arranged between the second sealing surface and the second sealing ring, the sealing flange is connected with the first valve seat through a bolt, a gasket groove is arranged on the second valve seat, and the sealing gasket is located in the gasket groove.

3. The double seat stop valve in a steam turbine system according to claim 2, wherein: the valve disc comprises a valve cover and a valve block, the valve cover is connected with the valve block, the first sealing ring is located on the valve cover, and the second sealing ring is located on the valve block.

4. The double seat stop valve in a steam turbine system according to claim 3, wherein: the lifting mechanism comprises a lifting oil cylinder, and a piston of the lifting oil cylinder is connected with a lifting rod.

5. The double seat stop valve in a steam turbine system according to claim 4, wherein: the sealing flange is provided with a first bulge corresponding to the first sealing ring, and the sealing gasket is provided with a second bulge corresponding to the second sealing ring.

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