CN113187951A

CN113187951A - Throttle and noise reduction filter screen regulating valve

Info

Publication number: CN113187951A
Application number: CN202110452145.5A
Authority: CN
Inventors: 余道刚; 梁小光; 李海龙; 崔秋雯
Original assignee: 703th Research Institute of CSIC
Current assignee: 703th Research Institute of CSIC
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-07-30

Abstract

The invention aims to provide a throttling and noise-reducing filter screen regulating valve which comprises a shell, a valve core, a valve rod, a sleeve and a filter screen body, wherein a flange is fixed above the shell, the sleeve is arranged in the flange in an interference manner, the valve rod penetrates through the sleeve from top to bottom and extends into the shell, the valve core is arranged in the shell and comprises three-stage shoulders, the three-stage shoulders are distributed from top to bottom, the end part of the valve rod is connected with a first-stage shoulder, the filter screen body comprises first-third-stage filter screen bodies, the first-stage filter screen body is arranged on the part above the first-stage shoulder, a second-stage filter screen body is arranged on the part between the first-stage shoulder and a second-stage shoulder, and the third-stage filter screen body is arranged on the part between the second-stage shoulder and the third-stage shoulder. The invention can adjust the steam flow of the steam turbine of the ship steam turbine set under low working condition and small pressure ratio, controls the steam turbine flow and pressure through the filter screen, linearizes the valve adjusting characteristic, and reduces noise by adopting multi-stage throttling of the filter screen.

Description

Throttle and noise reduction filter screen regulating valve

Technical Field

The invention relates to a valve, in particular to a valve for controlling steam flow of a steam turbine.

Background

The steam volume is controlled to the valve or the pyriform valve that adopts spherical pre-starting to open usually to current boats and ships steam turbine under the low operating mode low-pressure ratio condition and satisfies the operating mode requirement, because low operating mode low-pressure ratio, pre-starting valve or pyriform valve aperture are very little, lead to often appearing the sound of whistling when moving, make noise greatly increased, seriously influenced the noise index of boats and ships, can't satisfy modern boats and ships low noise index.

Disclosure of Invention

The invention aims to provide a throttling noise reduction filter screen regulating valve for regulating the steam flow of a steam turbine of a ship steam turbine set under low working condition and small pressure ratio.

The purpose of the invention is realized as follows:

the invention relates to a throttling noise-reducing filter screen regulating valve, which is characterized in that: the novel valve comprises a shell, a valve core, a valve rod, a sleeve and a filter screen body, wherein the flange is fixed above the shell, the sleeve is arranged in the flange in an interference manner, the valve rod penetrates through the sleeve from top to bottom and extends into the shell, the valve core is arranged in the shell, the valve core comprises three-stage convex shoulders which are distributed from top to bottom, the end part of the valve rod is connected with a first-stage convex shoulder, the filter screen body comprises first-third filter screen bodies, the part above the first-stage convex shoulder is provided with the first-stage filter screen body, the part between the first-stage convex shoulder and a second-stage convex shoulder is provided with a second-stage filter screen body, and the part between the second-stage convex shoulder and the third-stage convex shoulder is provided with the third-stage filter screen body.

The present invention may further comprise:

1. set up second grade sleeve and tertiary sleeve in the casing, second grade sleeve is located second grade filter screen body outside and forms second grade steam cavity rather than, and tertiary sleeve is located third grade filter screen body outside and forms tertiary steam cavity rather than.

2. The end part of the valve rod is connected with the first-stage convex shoulder through a gland, a load reduction gap is reserved between the valve rod and the gland, and the gland and the valve core form a load reduction valve cavity.

3. The middle part of the valve core is provided with a central hole, and the load reduction valve cavity unloads pressure through the central hole.

4. A cone seal is formed between the first stage shoulder and the housing.

5. The size of the filter mesh holes of the filter screen body is gradually increased from the third filter screen body to the first filter screen body.

6. The part of the sleeve outside the flange is provided with a stop plate which is fixed on the flange through screws.

The invention has the advantages that: the invention can adjust the steam flow of the steam turbine of the ship steam turbine set under low working condition and small pressure ratio, controls the steam turbine flow and pressure through the filter screen, linearizes the valve adjusting characteristic, and reduces noise by adopting multi-stage throttling of the filter screen.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:

referring to fig. 1, the filter screen body 10 of the present invention employs three-stage filter screen bodies, and the sizes of the filter screen holes are increased step by step according to the conversion of thermodynamic calculation;

the valve core 13 of the invention adopts a three-level shoulder to adjust and seal the filter screen body 10, the first level is added with cone seal, the initial position of the valve core is ensured, and the steam leakage amount of the initial position is reduced;

according to the invention, the valve rod 1 and the valve core 13 are designed to be separated, and the gland 12 is fixed on the valve core 13 by the bolt 11, so that the phenomenon of installation jam caused by poor coaxiality of the valve rod 1 and the valve core 13 is avoided, and the assembly property is improved;

the invention designs the relief valve, the relief valve and the valve rod 1 are designed into a whole, the relief valve seat and the valve core 13 are designed into a whole, the relief stroke is designed through the valve rod 1 and the gland 12, and the lifting force of the valve is reduced after the pressure of the relief valve cavity is unloaded to the valve through the central hole of the valve core;

as shown in fig. 1, the valve core 13, the filter screen body 10 and the shell 14 divide the filter screen valve into three stages, when the valve core 13 is opened, steam flows from top to bottom from a first-stage opened filter screen into a second-stage unopened filter screen and enters a second-stage steam chamber, then flows through the second-stage opened filter screen into a third-stage unopened filter screen and enters a third-stage steam chamber, finally, the third-stage opened filter screen enters the inside of the steam turbine, the filter screen body 10 is in a welded structure, and forms a second-stage and third-stage steam chamber through two sleeves, and the filter screen body 10 is connected with the shell 14 through interference fit; the valve rod 1 and the gland 12 are fixed on the valve core 13 through the screw 11, a load relief gap is reserved between the valve rod 1 and the gland 12, and when the valve rod 1 is lifted, steam pressure of a load relief valve cavity formed by the gland 12 and the valve core 13 is unloaded into a steam turbine through a central hole of the valve core 13, so that the lifting force of the valve is reduced; the sleeve 5 is arranged in the flange 4 in an interference manner, in order to prevent the sleeve 5 from shifting in the process of expansion with heat and contraction with cold, the stop plate 3 is used for carrying out axial positioning, and the positioning plate is fixed on the flange 4 through the screw 2; the flange 4 is fixed on the shell 14 through a nut 6, a stud 7 and a gasket 8, and the flange 4 and the shell 14 are sealed through a gasket 9 in order to prevent steam of the shell 14 from leaking outwards.

The filter screen valve is connected with the steam inlet and the steam outlet through flanges, the valve rod 1 is connected with the actuating mechanism through threads, the filter screen valve is opened when the valve rod 1 is lifted, the filter screen valve gradually opens to a full-open position along with the increase of the lifting height, the filter screen valve is gradually closed through the second-level throttle valve and the third-level throttle valve when the valve rod 1 is further lifted, and the filter screen valve is closed when the maximum stroke is reached;

the shell 14 is removed, and the filter screen valve can be arranged in a high-pressure cylinder of the steam turbine to adjust the low working condition and small opening degree of the steam turbine;

the shell 14 is connected with an actuating mechanism by changing the connection mode of the valve rod 1;

different stages of throttling regulation are realized by increasing or reducing the filter screen stages of the filter screen body 10, such as two stages, four stages, five stages and the like;

the actuating mechanism comprises a screw manual, a motor drive, a hydraulic drive and other lifting modes of lifting the valve rod to realize manual or automatic control.

Claims

1. Throttle filter screen governing valve of making an uproar that falls, characterized by: the novel valve comprises a shell, a valve core, a valve rod, a sleeve and a filter screen body, wherein the flange is fixed above the shell, the sleeve is arranged in the flange in an interference manner, the valve rod penetrates through the sleeve from top to bottom and extends into the shell, the valve core is arranged in the shell, the valve core comprises three-stage convex shoulders which are distributed from top to bottom, the end part of the valve rod is connected with a first-stage convex shoulder, the filter screen body comprises first-third filter screen bodies, the part above the first-stage convex shoulder is provided with the first-stage filter screen body, the part between the first-stage convex shoulder and a second-stage convex shoulder is provided with a second-stage filter screen body, and the part between the second-stage convex shoulder and the third-stage convex shoulder is provided with the third-stage filter screen body.

2. The throttle noise reduction screen conditioning valve of claim 1, wherein: set up second grade sleeve and tertiary sleeve in the casing, second grade sleeve is located second grade filter screen body outside and forms second grade steam cavity rather than, and tertiary sleeve is located third grade filter screen body outside and forms tertiary steam cavity rather than.

3. The throttle noise reduction screen conditioning valve of claim 2, wherein: the end part of the valve rod is connected with the first-stage convex shoulder through a gland, a load reduction gap is reserved between the valve rod and the gland, and the gland and the valve core form a load reduction valve cavity.

4. A throttle noise reduction screen conditioning valve as defined in claim 3 wherein: the middle part of the valve core is provided with a central hole, and the load reduction valve cavity unloads pressure through the central hole.

5. The throttle noise reduction screen conditioning valve of claim 4, wherein: a cone seal is formed between the first stage shoulder and the housing.

6. The throttle noise reduction screen conditioning valve of claim 5, wherein: the size of the filter mesh holes of the filter screen body is gradually increased from the third filter screen body to the first filter screen body.

7. The throttle noise reduction screen conditioning valve of claim 6, wherein: the part of the sleeve outside the flange is provided with a stop plate which is fixed on the flange through screws.