CN103075207A - Vacuum protection device of steam turbine - Google Patents
Vacuum protection device of steam turbine Download PDFInfo
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- CN103075207A CN103075207A CN2013100300514A CN201310030051A CN103075207A CN 103075207 A CN103075207 A CN 103075207A CN 2013100300514 A CN2013100300514 A CN 2013100300514A CN 201310030051 A CN201310030051 A CN 201310030051A CN 103075207 A CN103075207 A CN 103075207A
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- steam turbine
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Abstract
The invention belongs to the technical field of steam turbines and provides a vacuum protection device of the steam turbine. The vacuum protection device comprises a terminal pad connected with a back air cylinder of the steam turbine, wherein the terminal pad is provided with a plurality of air holes and is connected with an exhaust body which is provided with an exhaust channel communicated with the outside, the exhaust channel corresponds to the plurality of air holes in position and is communicated with the air holes, a diaphragm is arranged between the exhaust body and the terminal pad, and a diaphragm breaking mechanism is arranged in the exhaust channel and is arranged on the exhaust body; and the diaphragm can separate the back air cylinder of the steam turbine from the outside so as to play a role of sealing the back air cylinder of the steam turbine, when a unit vacuum system is in fault, the interior of the back air cylinder is in an overpressure state, the diaphragm acts and is broken by the diaphragm breaking mechanism so that the back air cylinder of the steam turbine is communicated with the outside, steam inside the back air cylinder of the steam turbine is to be exhausted to the outside to discharge surplus steam, and thus the pressure inside the back air cylinder is reduced to protect the steam turbine from being damaged.
Description
Technical field
The invention belongs to the steam turbine technology field, relate in particular to a kind of steam turbine vacuum protective gear.
Background technique
Steam turbine is a kind of take steam as power, and the heat energy of steam is converted into the rotating machinery of mechanical work, is most widely used prime mover in the modern thermal power plant, and steam turbine has the advantages such as single-machine capacity is large, efficient is high, the life-span is long.The low pressure (LP) cylinder of steam turbine can only bear low pressure, and the pipeline that especially is connected with low pressure (LP) cylinder and the vapour condenser of bottom thereof can not bear high pressure, and the superpressure operation meeting of low pressure (LP) cylinder causes very large harm to the Security of unit.
Cause low pressure (LP) cylinder superpressure when work when the unit vacuum system breaks down, can cause following point:
(1) minimizing falls in heat content in the steam turbine, thereby makes the reduction of exerting oneself, and has reduced the efficient of steam turbine, has reduced economic benefit;
(2) vapor density increases in the low pressure (LP) cylinder, makes the excess load of afterbody blade, causes leaf destruction;
(3) increase the inter-stage degree of reaction, end thrust is increased, the thrust-bearing excess load makes thrust-bearing tungsten financeization when serious;
(4) exhaust temperature is raise, cause low pressure (LP) cylinder thermal expansion distortion, condenser copper tube stress increases, and destroys the leakproofness of copper pipe;
(5) turbine low pressure cylinder is out of shape because vapor (steam) temperature raises, causes unit vibration, even make unit be forced to load shedding or shutdown;
(6) because the air partial pressure increases, increased the solubility of air in water, thereby the oxygen content in the water of condensation is increased, aggravated the corrosion of low pressure pipeline and low-pressure heater, increased the burden of oxygen-eliminating device, unit safety operation has been had adverse influence;
(7) air accumulation increases heat transmission resistance around water pipe, and terminal temperature difference increases, and vacuum descends; The air partial pressure increases the adverse effects such as burden increase that also generation makes condensate undercooling increasing and air ejector.
This shows that the superpressure operation meeting of low pressure (LP) cylinder causes very large harm to the Security of unit.
Summary of the invention
Technical problem to be solved by this invention is: a kind of steam turbine vacuum protective gear is provided, is intended to solve when the unit vacuum system breaks down, the work of low pressure (LP) cylinder superpressure causes the technical problem of damage to unit.
For solving the problems of the technologies described above; technological scheme of the present invention is: the steam turbine vacuum protective gear; comprise the land that is connected with the exhaust casing of described steam turbine; described land is provided with some pores; described land connects an exhaust body; described exhaust body has the exhaust passage that is in communication with the outside; described exhaust passage is corresponding with some described pores position and be communicated with described pore; be provided with barrier film between described exhaust body and the described land; be provided with a rupture of membranes mechanism in the described exhaust passage, described rupture of membranes mechanism is installed on the described exhaust body.
As a kind of improvement, described rupture of membranes mechanism comprises the support that is fixedly installed in the described exhaust passage, and described support is provided with the tip towards the bayonet of described barrier film.
As a kind of improvement, be provided with sealing gasket between described land and the described exhaust body, have the venting cavity that is communicated with described exhaust passage and pore on the described sealing gasket.
After having adopted technique scheme, the invention has the beneficial effects as follows:
Owing to be provided with barrier film in the steam turbine vacuum protective gear; exhaust casing and the external world of steam turbine can be separated, the exhaust casing of steam turbine is sealed, when unit vacuum system fault; superpressure in the exhaust casing; barrier film will move, and rupture of membranes mechanism destroys barrier film, and the exhaust casing of steam turbine is in communication with the outside; steam in the steam turbine exhaust casing will be discharged to the external world; lay down unnecessary steam, reduce the pressure in the exhaust casing, the protection steam turbine is not damaged.
Because rupture of membranes mechanism is provided with the tip towards the bayonet of barrier film, can effectively barrier film be punctured, and is simple in structure, convenient and swift, guarantee the Security of steam turbine.
Owing to be provided with sealing gasket between land and the exhaust body, strengthen the sealing of protective gear, prevent the steam leakage in the exhaust casing, energy saving increases economic benefit.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Among the figure, 1, land, 11, pore, 2, the exhaust body, 21, the exhaust passage, 3, barrier film, 4, support, 5, bayonet, 6, sealing gasket.
Embodiment
In order to make purpose of the present invention, technological scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structural representation of the steam turbine vacuum protective gear that the embodiment of the invention provides, and for convenience of explanation, has only provided part related to the present invention among the figure.
The steam turbine vacuum protective gear that the embodiment of the invention provides, comprise the land 1 that is connected with the exhaust casing of steam turbine, land 1 is provided with some pores 11, land 1 connects an exhaust body 2, exhaust body 2 has the exhaust passage 21 that is in communication with the outside, and exhaust passage 21 is corresponding with some pores 11 positions and be communicated with pore 11, is provided with barrier film 3 between exhaust body 2 and the land 1, be provided with a rupture of membranes mechanism in the exhaust passage 21, rupture of membranes mechanism is installed on the exhaust body 2; Barrier film 3; exhaust casing and the external world of steam turbine can be separated, the exhaust casing of steam turbine is sealed, when unit vacuum system fault; superpressure in the exhaust casing; barrier film 3 will move, and rupture of membranes mechanism destroys barrier film 3, and the exhaust casing of steam turbine is in communication with the outside; steam in the steam turbine exhaust casing will be discharged to the external world; lay down unnecessary steam, reduce the pressure in the exhaust casing, the protection steam turbine is not damaged.
Rupture of membranes mechanism comprises the support 4 that is fixedly installed in the exhaust passage 21, and support 4 is provided with the tip towards the bayonet 5 of barrier film 3, and bayonet 5 can effectively puncture barrier film 3, and is simple in structure, convenient and swift, guarantees the Security of steam turbine.
Be provided with sealing gasket 6 between land 1 and the exhaust body 2, have the venting cavity that is communicated with exhaust passage 21 and pore 11 on the sealing gasket 6, sealing gasket 6 can strengthen the sealing of protective gear, prevents the steam leakage in the exhaust casing, and energy saving increases economic benefit.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. steam turbine vacuum protective gear; it is characterized in that; comprise the land that is connected with the exhaust casing of described steam turbine; described land is provided with some pores, and described land connects an exhaust body, and described exhaust body has the exhaust passage that is in communication with the outside; described exhaust passage is corresponding with some described pores position and be communicated with described pore; be provided with barrier film between described exhaust body and the described land, be provided with a rupture of membranes mechanism in the described exhaust passage, described rupture of membranes mechanism is installed on the described exhaust body.
2. steam turbine vacuum protective gear as claimed in claim 1 is characterized in that, described rupture of membranes mechanism comprises the support that is fixedly installed in the described exhaust passage, and described support is provided with the tip towards the bayonet of described barrier film.
3. steam turbine vacuum protective gear as claimed in claim 1 or 2 is characterized in that, is provided with sealing gasket between described land and the described exhaust body, has the venting cavity that is communicated with described exhaust passage and pore on the described sealing gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100300514A CN103075207A (en) | 2013-01-25 | 2013-01-25 | Vacuum protection device of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100300514A CN103075207A (en) | 2013-01-25 | 2013-01-25 | Vacuum protection device of steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103075207A true CN103075207A (en) | 2013-05-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100300514A Pending CN103075207A (en) | 2013-01-25 | 2013-01-25 | Vacuum protection device of steam turbine |
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| CN (1) | CN103075207A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4079854A (en) * | 1976-08-09 | 1978-03-21 | Continental Disc Corporation | Rupture disc pressure relief device |
| US4211334A (en) * | 1977-09-12 | 1980-07-08 | B S & B Safety Systems, Inc. | Safety pressure relief apparatus |
| CN2802436Y (en) * | 2004-08-05 | 2006-08-02 | 大连理工大学 | Self-holding demolition gear |
| CN101514760A (en) * | 2009-03-17 | 2009-08-26 | 上海华理安全装备有限公司 | Two-way rupture disk safety device |
| CN201497388U (en) * | 2009-08-27 | 2010-06-02 | 杭州汽轮辅机有限公司 | Safe diaphragm plate for condenser |
| CN203081514U (en) * | 2013-01-25 | 2013-07-24 | 潍坊雷诺特动力设备有限公司 | Turbine vacuum protection device |
-
2013
- 2013-01-25 CN CN2013100300514A patent/CN103075207A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4079854A (en) * | 1976-08-09 | 1978-03-21 | Continental Disc Corporation | Rupture disc pressure relief device |
| US4211334A (en) * | 1977-09-12 | 1980-07-08 | B S & B Safety Systems, Inc. | Safety pressure relief apparatus |
| CN2802436Y (en) * | 2004-08-05 | 2006-08-02 | 大连理工大学 | Self-holding demolition gear |
| CN101514760A (en) * | 2009-03-17 | 2009-08-26 | 上海华理安全装备有限公司 | Two-way rupture disk safety device |
| CN201497388U (en) * | 2009-08-27 | 2010-06-02 | 杭州汽轮辅机有限公司 | Safe diaphragm plate for condenser |
| CN203081514U (en) * | 2013-01-25 | 2013-07-24 | 潍坊雷诺特动力设备有限公司 | Turbine vacuum protection device |
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Application publication date: 20130501 |