CN111412024A - Double-throttling short pipe structure - Google Patents
Double-throttling short pipe structure Download PDFInfo
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- CN111412024A CN111412024A CN202010198289.8A CN202010198289A CN111412024A CN 111412024 A CN111412024 A CN 111412024A CN 202010198289 A CN202010198289 A CN 202010198289A CN 111412024 A CN111412024 A CN 111412024A
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- short pipe
- throttling
- pressure sampling
- double
- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a double-throttling short pipe structure, which comprises a short pipe, wherein a throttling column is arranged in the middle of the interior of the short pipe, and a throttling hole is arranged in the middle of the throttling column; the outer diameter of the short pipe is the same as that of the pressure sampling pipeline, and the inner diameter of the short pipe is smaller than that of the pressure sampling pipeline; when joint and welding seam appear leaking, because oil power change and the throttle effect that two throttles brought can slow down the leakage speed and the leakage quantity of safe oil, guarantee that the system oil pressure is stable, strive for the time for the maintainer salvagees, if in time properly handle, can effectively avoid the condition emergence that the unit was forced to shut down the operation. The short pipe is connected with the pressure sampling pipeline and arranged between the pressure sampling meter and the secondary valve; the short pipe is convenient to clean in the shutdown maintenance period, and pressure sampling distortion caused by blockage of the throttling hole is avoided. The invention greatly improves the reliability of the operation of the AST emergency trip system of the steam turbine.
Description
Technical Field
The invention relates to a safety oil pipeline structure of an AST (anaerobic, anoxic and oxic) critical interruption system of a steam turbine, in particular to a double-throttling short pipe structure.
Background
The AST emergency interruption system is an important component of a turbine regulating security system, is a turbine emergency shutdown protection system, and has very important significance in improving the working reliability of the turbine emergency shutdown protection system. The AST emergency shut-off system is mainly realized by an AST electromagnetic valve and pressure sampling switches PS1, PS2, PS3, PS4 and PS 5. In normal operation, the AST electromagnetic valve is in a power-on closing state, so that a safe oil pressure is established in an oil pipeline of an AST system, the oil pressure enables a cup-shaped slide valve of a quick unloading valve in a main speed regulating steam valve actuating mechanism and a speed regulating steam valve actuating mechanism to be in a closing position, an oil pressure is established by an oil motor, the valve is opened, and the steam turbine is operated safely. When the safety oil leaks a lot instantly and the like, the safety oil pressure of the system fluctuates low, the pressure sampling switch performs protection action at the moment, the system sends a tripping command, and the unit is stopped forcedly. In 2018, a certain power generation enterprise continuously generates 3 times of instant large-amount leakage of safety oil due to the fact that a sealing ring at a pressure switch joint is broken and a welding seam is cracked, so that a system safety oil pressure low-pressure switch action unit is unplanned and forced to stop running, and the safe and stable running of the unit is seriously threatened.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a double-throttling short tube structure which can prevent a large amount of safety oil from being leaked instantly, ensure the oil pressure of a system to be stable, strive for time to be properly treated for maintainers and reduce the unplanned shutdown of a unit.
The technical scheme adopted by the invention for solving the problems is as follows: a double-throttling short pipe structure is characterized by comprising a short pipe, wherein the outer diameter of the short pipe is 14-32mm, and the inner diameter of the short pipe is 5-12 mm. A throttling column is arranged in the middle of the inner part of the short pipe, the length of the throttling column is 5-10mm, a throttling hole is arranged in the middle of the throttling column, and the diameter of the throttling hole is 0.5-2 mm; the short pipe is connected with the pressure sampling pipeline and arranged between the pressure sampling meter and the secondary valve; the outer diameter of the short pipe is the same as that of the pressure sampling pipeline, and the inner diameter of the short pipe is smaller than that of the pressure sampling pipeline.
Preferably, the distance between the two ends of the short pipe and the pressure sampling meter and the length of the secondary valve are both larger than 70 mm.
Preferably, the length of the short pipe is 70-150 mm.
Preferably, the short pipe is made of the same material as the pressure sampling pipeline and is made of austenitic heat-resistant stainless steel.
Compared with the prior art, the invention has the following advantages and effects: the invention can prevent a large amount of safety oil from instantly leaking due to the breakage of the sealing ring at the joint of the pressure switch and the cracking of the welding line, when the joint and the welding line leak, the oil power change is caused by the reduction of the inner diameter of the short pipe to generate certain supercharging and throttling functions, and the throttling effect of the throttling column is added, so that the leakage speed and the leakage amount of the safety oil can be reduced, the oil pressure of the system is ensured to be stable, the time is strived for the rush repair of maintainers, and if the timely and proper treatment is carried out, the condition that the unit is forced to stop running can be effectively avoided. Meanwhile, the structure is arranged between the secondary valve and the pressure gauge, so that the throttling short pipe is convenient to clean in a shutdown maintenance period, and pressure sampling distortion caused by blockage of the throttling hole is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a double-restriction sleeve in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
Referring to fig. 1, in the present embodiment, a double-throttling short tube structure includes a short tube 1, a throttling column 2 is disposed in the middle of the interior of the short tube 1, a throttling hole 6 is disposed in the middle of the throttling column 2, the short tube 1 is connected to a pressure sampling pipeline 3, the short tube 1 is disposed between a pressure sampling meter 4 and a secondary valve 5, a length L1 of the short tube 1 is 100mm, an outer diameter Φ 1 is 14mm, an inner diameter Φ 2 is 5mm, a length L of the throttling column 2 is 5mm, a diameter Φ 3 of the throttling hole 6 is 1mm, a length L3 of the pressure sampling meter 4 from both ends of the short tube 1 to the length L of the secondary valve 5 is 100mm, an outer diameter of the pressure sampling pipeline 3 is the same as an outer diameter of the short tube 1, a wall thickness of the pressure sampling pipeline 3 is 2mm, an inner diameter of the short tube 1 is smaller than an inner diameter of the pressure sampling pipeline 3, the short tube 1 is made of the same material as the pressure sampling.
In order to simulate the low safety oil pressure caused by the instant large leakage of the safety oil, a safety oil pressure test is carried out, and tests prove that when each high-pressure regulating valve is opened and closed rapidly to a large extent, the fluctuation condition of the safety oil pressure is obviously improved after the double-throttling short pipe is installed, and the change amplitude of the safety oil pressure is obviously reduced. In order to further explain the influence of the increase of the double-throttling short pipe on the system, system tripping and brake hanging tests are carried out, and the tests prove that after a system tripping test instruction is sent, the action delay of the oil pressure switch is 1s, and after a brake hanging instruction is sent, the action delay of the oil pressure switch is 3s, so that the safety requirement of the system is met. The increase of the double throttle short pipes greatly improves the pressure stability of the safety oil, meets the safety requirements of the system, greatly improves the working reliability of the AST electromagnetic valve and integrally improves the stability of the DCS system.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. A double-throttling short pipe structure is characterized by comprising a short pipe (1), wherein the outer diameter of the short pipe (1) is 14-32mm, the inner diameter of the short pipe is 5-12mm, a throttling column (2) is arranged in the middle of the inner part of the short pipe (1), the length of the throttling column (2) is 5-10mm, a throttling hole (6) is arranged in the middle of the throttling column (2), and the diameter of the throttling hole (6) is 0.5-2 mm; the short pipe (1) is connected with the pressure sampling pipeline (3), and the short pipe (1) is arranged between the pressure sampling meter (4) and the secondary valve (5); the outer diameter of the short pipe (1) is the same as that of the pressure sampling pipeline (3), and the inner diameter of the short pipe (1) is smaller than that of the pressure sampling pipeline (3).
2. A double-restriction short pipe structure according to claim 1, wherein the length of both ends of the short pipe (1) from the pressure sampling meter (4) and the secondary valve (5) is more than 70 mm.
3. A double-orifice stub tube structure according to claim 1, characterised in that the length of the stub tube (1) is 70-150 mm.
4. A double-restriction short pipe structure according to claim 1, wherein the material of the short pipe (1) is the same as that of the pressure sampling pipeline (3), and the short pipe is made of austenitic heat-resistant stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010198289.8A CN111412024A (en) | 2020-03-19 | 2020-03-19 | Double-throttling short pipe structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010198289.8A CN111412024A (en) | 2020-03-19 | 2020-03-19 | Double-throttling short pipe structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111412024A true CN111412024A (en) | 2020-07-14 |
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ID=71489187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010198289.8A Pending CN111412024A (en) | 2020-03-19 | 2020-03-19 | Double-throttling short pipe structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN111412024A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126293A (en) * | 1995-03-02 | 1996-07-10 | 中国人民解放军海军医学研究所 | Automatic distributing regulating valve |
| CN207095919U (en) * | 2017-08-10 | 2018-03-13 | 程顺平 | A kind of EH oil probe tubes for on-line analysis instrument on-line real-time measuremen |
| CN108397326A (en) * | 2018-01-23 | 2018-08-14 | 中国第汽车股份有限公司 | A kind of common-rail injector reducing leakage |
| CN108798548A (en) * | 2017-05-01 | 2018-11-13 | 刘向京 | A kind of oil/gas well annular space flow control pipe nipple and its application process |
| CN109268551A (en) * | 2018-11-20 | 2019-01-25 | 中国船舶重工集团公司第七0四研究所 | Self-operated type multi-level throttle lubricating oil pressure regulating valve |
| CN209181326U (en) * | 2018-09-25 | 2019-07-30 | 浙江盾安禾田金属有限公司 | Short tube bidirectional throttling valve |
-
2020
- 2020-03-19 CN CN202010198289.8A patent/CN111412024A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126293A (en) * | 1995-03-02 | 1996-07-10 | 中国人民解放军海军医学研究所 | Automatic distributing regulating valve |
| CN108798548A (en) * | 2017-05-01 | 2018-11-13 | 刘向京 | A kind of oil/gas well annular space flow control pipe nipple and its application process |
| CN207095919U (en) * | 2017-08-10 | 2018-03-13 | 程顺平 | A kind of EH oil probe tubes for on-line analysis instrument on-line real-time measuremen |
| CN108397326A (en) * | 2018-01-23 | 2018-08-14 | 中国第汽车股份有限公司 | A kind of common-rail injector reducing leakage |
| CN209181326U (en) * | 2018-09-25 | 2019-07-30 | 浙江盾安禾田金属有限公司 | Short tube bidirectional throttling valve |
| CN109268551A (en) * | 2018-11-20 | 2019-01-25 | 中国船舶重工集团公司第七0四研究所 | Self-operated type multi-level throttle lubricating oil pressure regulating valve |
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