阅读说明：本技术 适用于大口径汽轮机抽汽阀门的控制结构及控制方法 (Control structure and control method suitable for steam extraction valve of large-diameter steam turbine ) 是由 马静波 郑安 李德永 杨立勇 关志宏 林凯 于 2021-09-01 设计创作，主要内容包括：本发明涉及一种适用于大口径汽轮机抽汽阀门的控制结构及控制方法。现有技术的设置的结构使高温蒸汽长期直吹蝶形弹簧片,碟形弹簧片发生大面积断裂,使整个弹簧桶失去作用。本发明其组成包括：控制器箱体(6),所述的控制器箱体内部安装有齿轮(5),所述的齿轮内孔通过平键与连接阀杆(4)连接,所述的齿轮与齿条(8)啮合,所述的齿条左端与导向杆(7)固定,所述的导向杆穿过所述控制器箱体的侧壁与垫板(3)通过螺纹连接,所述的垫板右侧与一组蝶形弹簧(2)依次贴合,一组所述的蝶形弹簧、所述的垫板安装在弹簧筒(1)的内部,所述的连接阀杆与电动液压缸连接。本发明用于适用于大口径汽轮机抽汽阀门的控制结构。(The invention relates to a control structure and a control method suitable for a steam extraction valve of a large-diameter steam turbine. The structure of the prior art makes high-temperature steam blow the butterfly spring leaf directly for a long time, and the butterfly spring leaf breaks in a large scale, so that the whole spring barrel loses effect. The invention comprises the following components: controller box (6), controller box internally mounted have gear (5), the gear hole pass through the parallel key and be connected valve rod (4) and be connected, gear and rack (8) meshing, rack left end and guide bar (7) fixed, the guide bar pass controller box's lateral wall and backing plate (3) pass through threaded connection, the backing plate right side laminate in proper order with a set of belleville spring (2), a set of belleville spring the backing plate install in the inside of spring case (1), the connection valve rod be connected with electric hydraulic cylinder. The invention is used for the control structure of the extraction valve of the large-diameter steam turbine.)

1. The utility model provides a control structure suitable for heavy-calibre steam turbine extraction valve, its constitution includes: controller box, characterized by: the controller box internally mounted have the gear, the gear hole pass through the parallel key and be connected the valve rod with being connected, gear and rack toothing, the rack left end fixed with the guide bar, the guide bar pass the lateral wall and the backing plate of controller box pass through threaded connection, backing plate right side and a set of belleville spring laminate in proper order, a set of belleville spring backing plate install in the inside of spring case, the connection valve rod be connected with electric hydraulic cylinder.

2. The control structure for the extraction valve of a large diameter steam turbine according to claim 1, wherein: one end of the spring cylinder is connected with the controller box body through a bolt, the other end of the spring cylinder is connected with the end cover through a bolt, and a group of steam exhaust and drainage holes are formed in the peripheral side wall of the controller box body.

3. The control method of the control structure of the extraction valve of the large-diameter steam turbine according to one of claims 1 or 2, characterized in that: the method comprises the following steps:

firstly, the mounting positions of the disc springs are in the vertical direction of a connecting valve rod of the butterfly valve, the number of the disc springs meeting the quick closing number of the butterfly valve is selected according to the moment of the butterfly valve, and the radius of a thrust rod and a gear is 1.5-2 times that of the connecting valve rod;

a toothed groove is processed on a connecting valve rod of the butterfly valve or a small gear is arranged on the processed valve rod, a gear and rack meshing mode is adopted, a thrust rod perpendicular to the valve rod can be processed or arranged on the valve rod, and a guide rod extending out of a spring barrel is used for pushing the rack or the thrust rod to enable the valve to act;

when the butterfly valve is opened, the electric hydraulic cylinder is used for driving the connecting valve rod to rotate, the connecting valve rod drives the gear to enable the gear to be meshed with the rack, the rack moves horizontally to enable the guide rod to compress the butterfly spring, and meanwhile, the butterfly valve is opened;

after the butterfly valve is fully opened, the force of the spring barrel and the force of the electric hydraulic cylinder are balanced through an electromagnetic valve in the electric hydraulic cylinder;

when the butterfly valve needs to act, the electromagnetic valve is quickly opened to bypass the electric hydraulic cylinder, and the disc spring directly pushes the guide rod, so that the rack drives the gear to rotate the connecting valve rod, and the butterfly valve acts.

Technical Field

The invention relates to a control structure and a control method suitable for a steam extraction valve of a large-diameter steam turbine.

Background

The butterfly spring barrel is characterized in that a single accumulated butterfly spring is adopted and processed into a butterfly spring barrel form consisting of dozens of butterfly springs to serve as an actuator, the butterfly springs in the butterfly spring barrel are formed by single plates, even if one or more butterfly springs are broken, the large delay influence on the closing time of a valve can not be caused, the butterfly spring is particularly sensitive to high-temperature steam, the high-temperature steam is directly blown to the butterfly spring for a long time by the aid of the structure in the prior art, the butterfly spring is broken in a large area, and the whole spring barrel is disabled. Therefore how to avoid the executor of belleville spring bucket to avoid the high temperature steam that the valve rod spills directly blow to the belleville spring bucket in, can effectually shorten valve rod action stroke length moreover for the valve snap action is the problem that needs to solve at present.

Disclosure of Invention

The invention aims to provide a control structure and a control method suitable for a steam extraction valve of a large-diameter steam turbine, which are applied to a steam extraction heat supply pipeline system of the steam turbine with the diameter of more than DN1000, can meet the requirement that the extraction steam reaches the heat supply demand under the heat supply working condition, and can realize the rapid cutting off of the heat supply steam under the steam turbine accident working condition, thereby meeting all safety indexes required by a steam turbine speed regulating system.

The above purpose is realized by the following technical scheme:

the utility model provides a control structure suitable for heavy-calibre steam turbine extraction valve, its constitution includes: the controller box body, the inside gear that installs of controller box body, the gear hole pass through the parallel key and be connected with the connecting valve rod, gear and rack toothing, the rack left end fixed with the guide bar, the guide bar pass the lateral wall and the backing plate of controller box body pass through threaded connection, backing plate right side and a set of belleville spring laminate in proper order, a set of belleville spring backing plate install in the inside of spring case, the connecting valve rod be connected with electric hydraulic cylinder.

The control structure is suitable for the steam extraction valve of the large-caliber steam turbine, one end of the spring cylinder is connected with the controller box through a bolt, the other end of the spring cylinder is connected with the end cover through a bolt, and a group of steam exhaust and drainage holes are formed in the peripheral side wall of the controller box.

A control structure and a control method suitable for a steam extraction valve of a large-caliber steam turbine comprise the following steps: firstly, the mounting positions of the disc springs are in the vertical direction of a connecting valve rod of the butterfly valve, the number of the disc springs meeting the quick closing number of the butterfly valve is selected according to the moment of the butterfly valve, and the radius of a thrust rod and a gear is 1.5-2 times that of the connecting valve rod;

a toothed groove is processed on a connecting valve rod of the butterfly valve or a small gear is arranged on the processed valve rod, a gear and rack meshing mode is adopted, a thrust rod perpendicular to the valve rod can be processed or arranged on the valve rod, and a guide rod extending out of a spring barrel is used for pushing the rack or the thrust rod to enable the valve to act;

when the butterfly valve is opened, the electric hydraulic cylinder is used for driving the connecting valve rod to rotate, the connecting valve rod drives the gear to enable the gear to be meshed with the rack, the rack moves horizontally to enable the guide rod to compress the butterfly spring, and meanwhile, the butterfly valve is opened;

after the butterfly valve is fully opened, the force of the spring barrel and the force of the electric hydraulic cylinder are balanced through an electromagnetic valve in the electric hydraulic cylinder;

when the butterfly valve needs to act, the electromagnetic valve is quickly opened to bypass the electric hydraulic cylinder, and the disc spring directly pushes the guide rod, so that the rack drives the gear to rotate the connecting valve rod, and the butterfly valve acts.

Has the advantages that:

1. the invention relates to a novel steam extraction valve actuator for steam extraction and heat supply of a steam turbine, which is mainly applied to a steam extraction and heat supply pipeline system with the diameter of more than DN1000, and the structure can meet the requirement that the steam extraction amount under the heat supply working condition reaches the heat supply demand amount, and can also realize the rapid cutting off of heat supply steam under the steam turbine accident working condition, thereby meeting all safety indexes required by a steam turbine speed regulation system.

2. The invention adopts a transmission mode that the side-push butterfly valve is connected with the valve rod, thereby shortening the action time of the butterfly valve and simultaneously preventing the steam leaked from the connecting valve rod from directly blowing into the disc-shaped spring barrel.

3. The thrust rod and the gear of the invention are only slightly larger than the connecting valve rod, so that the action length of the rack or the guide rod can be effectively reduced, and the short stroke of the connecting valve rod is provided for realizing the quick action of the connecting valve.

4. According to the invention, because the disc-shaped spring barrel is arranged on the side surface of the connecting valve rod, steam leaked from the connecting valve rod cannot be directly blown onto the disc-shaped spring piece, so that high-temperature steam is prevented from blowing the disc-shaped spring piece at high temperature, and the safety of the disc-shaped spring is effectively ensured.

5. The invention installs the gear rack in the control box, and the controller box is installed with a group of steam-discharging drain holes to discharge the steam and condensed water leaked into the controller box by the connecting valve rod.

Description of the drawings:

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

Wherein: 1. the device comprises a spring cylinder, 2, a belleville spring, 3, a backing plate, 4, a connecting valve rod, 5, a gear, 6, a controller box, 7, a guide rod, 8, a rack, 9, a steam exhaust and drainage hole, 10 and an end cover.

The specific implementation mode is as follows:

example 1:

the utility model provides a control structure suitable for heavy-calibre steam turbine extraction valve, its constitution includes: controller box 6, controller box internally mounted have gear 5, the gear hole pass through the parallel key and be connected with connecting valve rod 4, gear and rack 8 meshing, the rack left end fixed with guide bar 7, the guide bar pass controller box's lateral wall and backing plate 3 pass through threaded connection, backing plate right side and a set of belleville spring 2 laminate in proper order, a set of belleville spring backing plate install in the inside of spring section of thick bamboo 1, connecting valve rod be connected with electric hydraulic cylinder.

Example 2:

according to the control structure suitable for the steam extraction valve of the large-caliber steam turbine in the embodiment 1, one end of the spring cylinder is connected with the controller box through a bolt, the other end of the spring cylinder is connected with the end cover 10 through a bolt, and a group of steam exhaust and drainage holes 9 are formed in the peripheral side wall of the controller box.

Example 3:

the control method of the control structure for the extraction valve of the large-caliber steam turbine according to the embodiment 1 or 2 comprises the following steps:

firstly, the mounting positions of the disc springs are in the vertical direction of a connecting valve rod of the butterfly valve, the number of the disc springs meeting the quick closing number of the butterfly valve is selected according to the moment of the butterfly valve, and the radius of a thrust rod and a gear is 1.5-2 times that of the connecting valve rod;

a toothed groove is processed on a connecting valve rod of the butterfly valve or a small gear is arranged on the processed valve rod, a gear and rack meshing mode is adopted, a thrust rod perpendicular to the valve rod can be processed or arranged on the valve rod, and a guide rod extending out of a spring barrel is used for pushing the rack or the thrust rod to enable the valve to act;

when the butterfly valve is opened, the electric hydraulic cylinder is used for driving the connecting valve rod to rotate, the connecting valve rod drives the gear to enable the gear to be meshed with the rack, the rack moves horizontally to enable the guide rod to compress the butterfly spring, and meanwhile, the butterfly valve is opened;

after the butterfly valve is fully opened, the force of the spring barrel and the force of the electric hydraulic cylinder are balanced through an electromagnetic valve in the electric hydraulic cylinder;

when the butterfly valve needs to act, the electromagnetic valve is quickly opened to bypass the electric hydraulic cylinder, and the disc spring directly pushes the guide rod, so that the rack drives the gear to rotate the connecting valve rod, and the butterfly valve acts.

The opening mode of the control can adopt various modes such as electric mode, hydraulic mode and the like, and the opened connecting position is more;

the key point of this application lies in using the closing control of belleville spring bucket as the steam turbine steam extraction heat supply pipeline valve that needs the quick closing, and the belleville spring bucket is installed in the side that the valve rod is connected to the belleville valve, has avoided connecting the high temperature high pressure steam that the valve rod spills to cause the influence to belleville spring life, is applicable to the quick-closing type or the quick-opening type valve that the pipe diameter is greater than DN 1000's steam conduit simultaneously.

The dish reed in the disc spring section of thick bamboo is that the single accumulation forms, there is the wholeness restriction of other cylinder spring, do not have a fault point and lead to the condition that whole disc spring bucket became invalid, but disc spring dreads to fear long-term high temperature steam and directly blows and lead to the disc fracture, spill in order to prevent steam from the door-lever of valve, install disc spring on dish valve connection valve rod vertically orientation, installation steam extraction and outlet on the controller box body simultaneously, avoid steam to get into in the disc spring bucket body.