阅读说明：本技术 一种汽轮机气密阻汽装置 (Airtight steam blocking device of steam turbine ) 是由 李名圆 贾恒请 郝东伟 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种汽轮机气密阻汽装置包括套装在汽轮机转子上的挡汽片、喷嘴组件、阻汽组件和可向汽轮机转子吹风的密封风气源系统；喷嘴组件位于挡汽片上方,包括两组喷组,喷组包括半环形本体和与半环形本体相连通的通道,半环形本体上开有多个出气孔,两个半环形本体相对设置形成一个环形,两个通道相对设置；阻汽组件包括电磁阀、缓冲罐、加热器、减压阀和隔绝阀,电磁阀、缓冲罐、加热器、减压阀与隔绝阀向逐渐远离汽轮机转子的方向依次设置；密封风气源系统位于隔绝阀的外侧并与隔绝阀相连接。本发明的便于安装和维护；利用密封风气源系统吹出的压缩空气在汽轮机转子上形成风幕封闭原有的蒸汽漏流通道,解决蒸汽泄漏进轴承箱的问题。(The invention discloses an airtight steam blocking device of a steam turbine, which comprises a steam blocking sheet sleeved on a steam turbine rotor, a nozzle assembly, a steam blocking assembly and a sealed air source system capable of blowing air to the steam turbine rotor; the nozzle assembly is positioned above the steam blocking sheet and comprises two groups of spraying groups, each spraying group comprises a semi-annular body and a channel communicated with the semi-annular body, a plurality of air outlet holes are formed in the semi-annular body, the two semi-annular bodies are oppositely arranged to form an annular shape, and the two channels are oppositely arranged; the steam-blocking component comprises an electromagnetic valve, a buffer tank, a heater, a pressure-reducing valve and an isolation valve, and the electromagnetic valve, the buffer tank, the heater, the pressure-reducing valve and the isolation valve are sequentially arranged in a direction gradually far away from the steam turbine rotor; the sealing air source system is positioned on the outer side of the isolation valve and connected with the isolation valve. The invention is convenient for installation and maintenance; compressed air blown out by the sealed air source system forms an air curtain on a turbine rotor to seal an original steam leakage channel, so that the problem of steam leakage into a bearing box is solved.)

1. The utility model provides an airtight vapour device that hinders of steam turbine, prevents that steam from leaking into bearing box, characterized by: the device comprises a steam blocking sheet (2) sleeved on a steam turbine rotor (1), a nozzle assembly (3), a steam blocking assembly (4) and a sealed air source system (5) capable of blowing air to the steam turbine rotor (1);

the nozzle assembly (3) is positioned above the steam blocking piece (2) and comprises two groups of spraying groups, each spraying group comprises a semi-annular body (31) and a channel (32) communicated with the semi-annular body (31), a plurality of air outlet holes are formed in the semi-annular body (31), the two semi-annular bodies (31) are oppositely arranged to form an annular shape, and the two channels are oppositely arranged;

the steam-blocking component (4) comprises an electromagnetic valve (41), a buffer tank (42), a heater (43), a pressure reducing valve (44) and an isolation valve (45), wherein the electromagnetic valve (41), the buffer tank (42), the heater (43), the pressure reducing valve (44) and the isolation valve (45) are sequentially arranged in a direction gradually far away from the steam turbine rotor (1);

the sealing air source system (5) is positioned on the outer side of the isolation valve (45) and is connected with the isolation valve (45).

2. The steam turbine airtight steam stop device according to claim 1, characterized in that: the steam-resistant assembly (4) further comprises a pressure gauge (46), and the pressure gauge (46) is located between the heater (43) and the pressure reducing valve (44).

3. The steam turbine airtight steam stop device according to claim 2, characterized in that: the steam-resistant assembly (4) further comprises a clamping sleeve tee joint (5), the middle joint of the clamping sleeve tee joint (5) is connected with the electromagnetic valve (41)46, and the other two end joints are respectively connected with the two channels (32) of the clamping sleeve tee joint (43) and communicated with each other.

4. The steam turbine airtight steam stop device according to claim 1, characterized in that: the steam-resistant assembly (4) further comprises a support (47), and the buffer tank (42) and the heater (43) are fixedly connected to the support (47).

5. The steam turbine airtight steam stop device according to claim 1, characterized in that: and a temperature sensor (48) is arranged on the buffer tank (42).

6. The steam turbine airtight steam stop device according to claim 1, characterized in that: and a dynamic and static gap is formed between the steam turbine rotor (1) and the steam blocking sheet (2).

Technical Field

The invention relates to the technical field of steam turbines, in particular to an airtight steam blocking device of a steam turbine, which prevents steam from leaking into a bearing box and has a better sealing effect.

Background

The steam blocking sheet used by the existing steam turbine set adopts a single-layer aluminum circular ring structure and is fixed on the side surface of the bearing box through a bolt assembly, so that the function of blocking the shaft seal from leaking steam to enter the bearing box is achieved.

In order to prevent the collision and abrasion between the steam blocking sheet and the steam turbine rotor, a gap of 4-5mm is reserved between the steam blocking sheet and the rotor on the existing steam turbine, and the shaft seal leakage cannot be completely prevented from entering a bearing box; because the steam blocking sheet is subjected to heat radiation of the cylinder for a long time, the steam blocking sheet is easy to deform, the gap between the steam blocking sheet and the rotor is further increased, the steam blocking effect is further reduced, and finally the problem that the water content in the lubricating oil exceeds the standard can occur.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to solve the problems of the prior art in the background art, an improved airtight steam stop device of a steam turbine is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows: an airtight steam blocking device of a steam turbine prevents steam from leaking into a bearing box, and comprises a steam blocking sheet sleeved on a steam turbine rotor, a nozzle assembly, a steam blocking assembly and a sealed air source system capable of blowing air to the steam turbine rotor;

the nozzle assembly is positioned above the steam blocking piece and comprises two groups of spraying groups, each spraying group comprises a semi-annular body and a channel communicated with the semi-annular body, a plurality of air outlet holes are formed in the semi-annular body, the two semi-annular bodies are oppositely arranged to form an annular shape, and the two channels are oppositely arranged;

the steam-blocking component comprises a solenoid valve, a buffer tank, a heater, a pressure reducing valve and an isolation valve, wherein the solenoid valve, the buffer tank, the heater, the pressure reducing valve and the isolation valve are sequentially arranged in a direction gradually far away from the steam turbine rotor;

the sealing air source system is positioned on the outer side of the isolation valve and is connected with the isolation valve.

The sealed air source system conveys compressed air to the turbine rotor through the isolation valve, the pressure reducing valve, the heater, the buffer tank, the electromagnetic valve and the nozzle assembly, and the compressed air forms an air curtain on the turbine rotor and isolates shaft seal steam leakage under the combined action of the air curtain and the steam blocking sheet.

The steam-resistant assembly further comprises a pressure gauge, and the pressure gauge is located between the heater and the pressure reducing valve.

The pressure gauge monitors the gas pressure in the corrugated pipe, and monitors whether the pressure is normal or not in real time.

The steam-resistant component also comprises a clamping sleeve tee joint, wherein the middle joint of the clamping sleeve tee joint is connected with the electromagnetic valve, and the other two end joints are respectively connected with the two channels and are mutually communicated.

The steam-resistant assembly further comprises a support, and the buffer tank and the heater are fixedly connected to the support.

And a temperature sensor is arranged on the buffer tank.

The temperature sensor measures the temperature of the hot air entering the buffer tank, and subsequent operation is adjusted according to the measured temperature. The temperature sensor and the electromagnetic valve are used as automatic protection devices to prevent compressed air below 80 ℃ from directly contacting the rotor of the steam turbine.

And a dynamic and static gap is formed between the steam turbine rotor and the steam blocking sheet.

The clearance between the steam blocking piece and the steam turbine rotor is properly increased by the dynamic and static clearance, and dynamic and static rubbing caused by deformation of the windshield is prevented.

The invention has the advantages that the invention is convenient to install and maintain; the compressed air blown out by the sealed air source system can be utilized to form an air curtain on the turbine rotor to seal the original steam leakage channel, so that the problem of steam leakage into the bearing box is thoroughly solved, the sealing effect is good, and the operation is reliable; can suitably increase the clearance between fender vapour piece and the rotor, prevent to produce because the windscreen warp and move and rub, when original fender vapour piece produces and warp, can not influence the vapour effect that hinders that the gas keeps off.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic structural view of the nozzle assembly of the present invention.

In the figure, the steam turbine comprises a steam turbine rotor 1, a steam blocking sheet 2, a nozzle assembly 31, a semi-annular body 32, a channel 4, a steam blocking assembly 41, an electromagnetic valve 42, a buffer tank 43, a heater 44, a pressure reducing valve 45, an isolation valve 46, a pressure gauge 47, a support 48, a temperature sensor 5 and a sealed air source system.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

The airtight steam blocking device for the steam turbine shown in fig. 1-2 prevents steam from leaking into a bearing box, and comprises a steam blocking sheet 2, a nozzle assembly 3, a steam blocking assembly 4 and a sealed air source system 5, wherein the steam blocking sheet 2 is sleeved on a steam turbine rotor 1, the sealed air source system 5 can blow air to the steam turbine rotor 1, and a dynamic and static gap is formed between the steam turbine rotor 1 and the steam blocking sheet 2.

Nozzle assembly 3 is located and keeps off vapour piece 2 top, including two sets of groups that spout, spouts the group and includes semi-annular body 31 and the passageway 32 that is linked together with semi-annular body 31, and it has a plurality of ventholes to open on the semi-annular body 31, and two semi-annular bodies 31 set up relatively and form an annular, and two passageways set up relatively.

The steam-blocking component 4 comprises an electromagnetic valve 41, a buffer tank 42, a heater 43, a pressure reducing valve 44 and an isolation valve 45, wherein the electromagnetic valve 41, the buffer tank 42, the heater 43, the pressure reducing valve 44 and the isolation valve 45 are sequentially arranged in a direction gradually far away from the steam turbine rotor 1; the steam-blocking component 4 further comprises a pressure gauge 46, the pressure gauge 46 is located between the heater 43 and the pressure reducing valve 44, the steam-blocking device further comprises a support 47, the buffer tank 42 and the heater 43 are fixedly connected onto the support 47, and a temperature sensor 48 is arranged on the buffer tank 42.

The sealing air source system 5 is located outside the isolation valve 45 and connected to the isolation valve 45.

The steam-blocking device also comprises a ferrule tee joint 5, the middle joint of the ferrule tee joint 5 is connected with the electromagnetic valve 41, and the other two end joints are respectively connected with the two channels 32 and are mutually communicated.

The invention is further described below:

one, installation

One end of an isolation valve 45 is connected with a sealed air source system 5 through a flange, the other end is welded with a threaded connector, a first corrugated pipe is arranged between the isolation valve 45 and a pressure reducing valve 44, the threaded connector of the isolation valve 45 is in threaded connection with the corrugated pipe, one end of the pressure reducing valve 44 is connected with the corrugated pipe through a sleeve joint, a second corrugated pipe is arranged between the pressure reducing valve 44 and a heater 43, the heater 43 and a buffer tank 44 are placed on a bracket 47, one end of the second corrugated pipe, which is close to the heater 43, is connected with the sleeve joint, the sleeve joint is connected with a three-way pipe joint, the middle joint of the three-way pipe joint is fixedly connected with the sleeve joint, the other two end joints are respectively connected with a pressure gauge 46 and the heater 43, a plastic hose is arranged between the heater 43 and the buffer tank 44, the outlet end of, the temperature sensor 48 is arranged at the outlet of the buffer tank 42, the outlet end of the buffer tank 42 is connected with the electromagnetic valve 41 through threads, the outlet end of the electromagnetic valve 41 is provided with a third corrugated pipe, the third corrugated pipe is communicated with an intermediate joint of the ferrule tee 5, joints at the other two ends of the ferrule tee 5 are connected and communicated with the two channels 32 of the nozzle assembly 3, the two semi-annular bodies 31 and the channels 32 are made of DN8 copper pipe, one end of the semi-annular body 31 is welded with one end of the channel 32, the other ends of the two semi-annular bodies 31 are welded to form an annular shape, and 16 semi-annular bodies 31 are equidistantly processed to form 16 semi-annular bodies 31The air outlet hole. The nozzle assembly 4 is fixed on one side surface of the steam-blocking piece 2 close to the cylinder through four pipeline clamps and screws.

Secondly, use

The sealed air supply system 5 is started, the isolation valve 45 is opened to allow compressed air to enter the first bellows, the pressure of the air in the first bellows and the second bellows is monitored by the pressure gauge 46, the pressure of the air in the bellows is adjusted by the pressure reducing valve 44, and the outlet temperature of the heater 43 is adjusted by adjusting the air flow and the heater power.

When the steam turbine normally works, the manual isolation valve 45 is opened, the sealing air source system 5 outputs 0.6MPa of compressed air, the compressed air passes through the pressure reducing valve 44, the pressure reducing valve 44 reduces the pressure of the compressed air to 0.2MPa, and the compressed air enters the heater 43 and is heated to 80-100 ℃. The temperature and the pressure of the hot air are stabilized after the hot air enters the buffer tank 42, the temperature sensor 48 collects the temperature of the hot air and sends an electric signal, and the electromagnetic valve 41 is opened. The air flows in the two channels 32 enter the two semi-annular bodies 31 and are blown out outwards through the air outlets, and the blown air flows form an air curtain on the surface of the turbine rotor 1 and are isolated from shaft seal air leakage under the coaction with the steam blocking sheets 8.

When the air temperature is lower than 80 ℃ due to the failure of the heater 43, the temperature sensor 48 sends an electric signal to the collected air temperature, the electromagnetic valve 41 is closed, and cold air is prevented from blowing the turbine rotor 1 directly, so that the turbine rotor 1 is prevented from being bent or generating large thermal stress.

When the invention is in long-time standby or needs to be overhauled and maintained, the isolation valve 45 is closed to isolate the compressed air from entering.

The invention is provided with two heaters 43, the two heaters 43 are connected in series, when the power of the steam-blocking device is smaller, the power and the heating temperature can be realized.

0.6MPa industrial compressed air is used as an air source of the sealed air source system 5.

The first corrugated pipe, the second corrugated pipe and the third corrugated pipe are made of DN15 stainless steel

The isolation valve 45 is a DN15 manual flange stop valve.

An electronic control box is arranged outside the heater 4, and the temperature of the sealing air is controlled to be 80-100 ℃.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.