CN104930294A - Damping pipe fitting for pulse monitoring - Google Patents
Damping pipe fitting for pulse monitoring Download PDFInfo
- Publication number
- CN104930294A CN104930294A CN201510197878.3A CN201510197878A CN104930294A CN 104930294 A CN104930294 A CN 104930294A CN 201510197878 A CN201510197878 A CN 201510197878A CN 104930294 A CN104930294 A CN 104930294A
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- CN
- China
- Prior art keywords
- damping
- pipe fitting
- pipe
- transfer tube
- subtube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/26—Details or accessories
Abstract
The invention discloses a damping pipe fitting for pulse monitoring. The damping pipe fitting is a linear pipeline which is composed of a main pipeline body and end pipes located at the two ends of the main pipeline body. The main pipeline body comprises a pipe wall and a damping ring which is attached to the inner side of the pipe wall and is made of a damping material, and pipe orifices of the end pipes are opposite to an inner ring hole of the damping ring, so that an airflow channel with the uniform inner diameter of the damping pipe fitting is formed. The main pipeline body is formed through butt joint of multiple branch pipelines. The damping pipe fitting can dissipate pressure pulses at a higher speed, the effect is good, and echo interference signals can be effectively prevented; the length of the damping pipe fitting can be greatly reduced, and the damping pipe fitting just needs to be about one meter to achieve the dissipation effect the same as that of a damping pipe fitting with the length being 10-20 meters in the prior art.
Description
Technical field
The present invention relates to a kind of damping pipe fitting of pressure pulsation monitoring system, particularly relate to the pulsation monitoring damping pipe fitting under combustion chamber high temperature condition of high voltage, belong to gas turbine test measurement technique field.
Background technique
Gas turbine is the power equipment of natural gas power Combined Cycle Unit, and body mainly comprises the core components such as gas compressor, firing chamber, turbine.The E/F level gas-turbine combustion chamber of current advanced person more extensively adopts dry low NO_x combustor (Dry Low NO
x, DLN) design concept, mainly adopt lean fuel premixed combustion form under operating mode at full capacity, rock gas and air carried out in advance abundant premix.But Stability of Premixed is poor, easily produce larger pressure pulsation, there is the problems such as tempering, flame-out, vibration.Under the conditions such as seasonal variations, unit performance deterioration, fuel conduit characteristic variations, the combustion characteristic of firing chamber can change usually, and the pressure pulsation situation of premixed combustion is all the more frequent.So usually in the situations such as maintenance, environmental change, gas turbine unit needs to carry out firing optimization usually, makes unit have sufficiently stable nargin, and nargin judgement and firing optimization are all the Real-Time Monitorings based on the pressure pulsation to firing chamber.
Current main fluctuation pressure monitoring mode has directly and indirect monitoring mode two kinds.Direct mode refers at burning barrel design tracting pressuring hole and setting pressure sensor, directly measures the pressure pulsation of flame area.Indirect mode refers to that design pressure inlet tube is communicated with flame area and draws pressure signal, and pressure inlet tube downstream position installed by pressure transducer, then draws; Or the local pressure pulsation of high-pressure air region measurement pressure transducer being directly installed on front end, zone of combustion, does not measure the signal of flame area.The direct metering system institute number of winning the confidence, near combustion zone, is conducive to operational monitoring personnel and judges; But the burning barrel of mounting zone bears high temperature, and high temperature gas flow by tracting pressuring hole directly and sensor contacts, and require high to sensor heatproof, cause sensor life-time shorter, rate of fault is high.The real signal of signal and zone of combustion that the pressure transducer of indirect mounting type detects has certain difference, and its advantage is less demanding to pressure transducer, and pressure transducer is without the need to bearing the high temperature of zone of combustion.
The present invention is directed to and adopt the monitoring system of indirect mode to improve.In prior art, adopt the monitoring system structure of indirect mode as shown in Figure 1, burning barrel 1 ' opens tracting pressuring hole 11 ', pressure inlet tube 2 ' is utilized to derive pressure signal from tracting pressuring hole 11 ', pipe downstream certain position place arranges fitting seat 3 ', pressure transducer 4 ' is arranged on fitting seat 3 ' perpendicular to airflow direction, measures pressure fluctuation signal.Fitting seat 3 ' rear end is also designed with pressure pulsation damping coil pipe 5 ', usually about 10 ~ 20 meters are had, be coiled to form by damp tube, its function is: allow pressure pulsation continue to dissipate gradually toward downstream travel, to make echo signal less, thus avoid interference the collection of fitting seat 3 ' upward pressure sensor 4 '.Finally connect nitrogen gas cylinder 6 ' at afterbody, utilize nitrogen to blow clearly pipeline.In monitoring system running, pressure inlet tube 2 ' is less with the gas medium average flow in damping coil pipe 5 ', and pressure fluctuation signal is propagated and be may be thought of as the propagation in static medium.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of damping pipe fitting of the new structure good to pressure pulsation dissipative effect.
The present invention solves its technical problem by following technical solution: a kind of pulsation monitoring damping pipe fitting, it is characterized in that, described damping pipe fitting is the straight line pipeline be made up of with the end pipe being positioned at described main pipeline two ends main pipeline, described main pipeline comprises tube wall and againsts the damping ring be made up of damping material arranged inside tube wall, the mouth of pipe of described end pipe is relative with the interior annular distance of described damping ring, forms the air-flow path that described damping pipe fitting internal diameter is well-balanced.
As improvement of the present invention: described main pipeline is docked by some sections of subtubes and forms.
As a further improvement on the present invention: described subtube is docked by transfer tube, described transfer tube comprises outer tube and interior pipe, interior pipe is positioned at outer tube, ends of tubes correspondence is connected and forms the end face of described transfer tube, an annular chamber closed is formed between two pipes, with the aperture both ends of the surface of described transfer tube being all provided with multiple and described annular chamber and being communicated with on the tube wall of described interior pipe, the mouth of pipe of described interior pipe is relative with the interior annular distance of described subtube internal damping ring, aperture in described transfer tube both ends of the surface is relative with the anchor ring of described subtube internal damping ring, described annular chamber is communicated with the Damping material layer in described subtube.
The selection of described damping material is determined for absorbing the frequency of dissipation according to it, damping material in the subtube of described damping pipe fitting is identical or different, absorption for the intermediate frequency described damping material that dissipates can adopt glass wool material, and the described damping material that dissipates of the absorption for low frequency can adopt submissive type damping material.
The frequency f that the structure of described transfer tube dissipates as required adjusts, and formula is as follows:
Wherein, p represents the punching rate of transfer tube inner pipe wall, and b represents the thickness of transfer tube inner pipe wall, and D represents the thickness of annular chamber in transfer tube, and c represents the velocity of sound, L
kfor geometric properties coefficient.
Described transfer tube and described subtube are docked by flange arrangement.
As the preferred embodiment of the present invention, the structure of described end pipe is as follows: described end pipe is the pipeline section that one end is provided with ferrule structure, described end pipe also comprises a lock nut, lock nut is the female tubular structure of tool, lock nut is contained on described pipeline section by its bottom surface perforate flip sleeve, opening end is outside, and the bottom surface of described tubular structure and described ferrule structure form the structure that offsets to prevent lock nut slippage.
Relative to prior art, the present invention has following beneficial effect:
1) damping pipe fitting of the present invention is fast to pressure pulsation dissipative velocity, effective, effectively can prevent echo talker, greatly can shorten the length of damping pipe fitting, damping pipe fitting of the present invention only needs about the 1 meter dissipative effect that can reach 10 ~ 20 meters of damping pipe fittings in prior art;
2) each subtube of damping pipe fitting of the present invention can, according to the spectral characteristic of measuring object, select suitable acoustic damping material to carry out absorption to ducted pressure pulsation and dissipate, and its absorption band be wider.
3) design of transfer tube annular chamber of the present invention and the many small structures of end face, makes annular chamber communicate with Damping material layer in subtube, can strengthen the damping of damping pipe fitting to low-frequency range sound wave; The design of transfer tube annular chamber of the present invention and the many small structures of inner pipe wall, air-flow path is communicated with annular chamber by aperture, damping pipe fitting of the present invention can be absorbed medium-high frequency pressure pulsation in air-flow path, it is slightly narrow that it absorbs frequency range, by the adjustment to transfer tube structure, absorption is carried out to the pressure pulsation in narrower frequency range and dissipates;
4) damping pipe fitting of the present invention adopts segmental structure, can according to different demand independent assortment, and the present invention also has dismounting combined and instant, can make the advantage that the structure of monitoring system is compacter.
Accompanying drawing explanation
Fig. 1 is the structural representation of the monitoring system adopting indirect mode in prior art;
Fig. 2 is the structural representation of the damping pipe fitting of the specific embodiment of the invention;
Fig. 3 is the stereogram of two kinds of subtubes of main pipeline in Fig. 2;
Fig. 4 is the stereogram of Fig. 2 medial end portions pipe;
Fig. 5 is the stereogram of transfer tube in Fig. 2.
Embodiment
As shown in Figure 2, the damping pipe fitting of the present embodiment is the straight line pipeline be made up of with the end pipe 2 being positioned at main pipeline two ends main pipeline.
Main pipeline comprises tube wall 3 and againsts the damping ring 6 be made up of damping material arranged inside tube wall 3.Main pipeline is formed by transfer tube docking by four sections of subtubes.As shown in Figure 3, include the subtube of two types in the present embodiment, the two width figure be positioned in Fig. 3 are above the subtube being positioned at main pipeline two ends, and the width figure be positioned in Fig. 3 is below positioned at the subtube in the middle of main pipeline.
As shown in Figure 3, be positioned at the overall cylindrical tubular structure of subtube at main pipeline two ends, have a perforate in the middle part of at the bottom of cylinder, nozzle edge outwards overturns, and forms flange plate 4 (screw does not draw).The subtube be positioned in the middle of main pipeline is the cylindrical barrel structure of a both ends open, and nozzle edge, two ends outwards overturns, and all forms flange plate 4 (screw does not draw).Damping ring 6 in subtube is by such as under type acquisition: shown cylindrical barrel structure is interior in figure 3 in advance inserts a cylinder, then between this cylinder and cylindrical barrel inner structural wall, damping material is put into, after damping material sizing, take out cylinder again, the subtube in Fig. 2 can be obtained.
As shown in Figure 5, transfer tube comprises outer tube 5 and interior pipe 11, and it is inner that interior pipe 11 is positioned at outer tube 5, forms an annular chamber 10 closed between connected end face 9, two pipe 5,11 forming transfer tube of ends of tubes correspondence.The tube wall of interior pipe 11 is all provided with multiple aperture be communicated with annular chamber 10 with in the both ends of the surface 9 of transfer tube.The mouth of pipe of interior pipe 5 and the mouth of pipe of end pipe 2 are all relative with the interior annular distance of subtube internal damping ring 6, form the air-flow path that damping pipe fitting internal diameter is well-balanced.Air-flow path is specifically made up of the tube chamber 8 of pipe 11 in the tube chamber 1 of end pipe 2, the inner chamber 7 of subtube internal damping ring 6 and transfer tube, and the area of their cross section is consistent.Aperture in transfer tube both ends of the surface 9 is relative with the anchor ring of subtube internal damping ring 6, to be communicated with the Damping material layer in subtube by annular chamber 10.
As shown in Figure 2,4, the structure of end pipe 2 is as follows: end pipe 2 is provided with the pipeline section of ferrule structure 13 for one end, end pipe 2 also comprises a lock nut 12, lock nut 12 is in the female tubular structure of tool, lock nut 12 is contained on pipeline section by its bottom surface perforate flip sleeve, opening end is outside, and bottom surface and ferrule structure 13 form the structure that offsets to prevent lock nut 12 slippage.
Damping pipe fitting course of working of the present invention is as follows:
(1) lock nut 12 and ferrule structure 13 are assemblied on the pipeline section of end pipe 2 by the first step, and ferrule structure 13 is welded on pipeline section, process 2 altogether;
(2) second step fills damping material in each subtube, forms damping ring 6, ensures that the diameter of inner chamber 7 of damping ring 6 is identical with the diameter of the tube chamber 1 of end pipe 2, is so conducive to acoustic transmission, avoids reflection echo.The selection of damping material is determined according to measuring object, and the absorption for intermediate frequency dissipates and can adopt glass wool material, and the absorption for low frequency dissipates and can adopt submissive type damping material, and the absorption band of this section of damping pipe fitting is wider;
(3) the 3rd step casting processing transfer tubes, ensure that the diameter of tube chamber 8 of pipe 11 in transfer tube is identical with the diameter of the tube chamber 1 of end pipe 2; Aperture on transfer tube end face 9 communicates with the Damping material layer in subtube, strengthens the damping of low-frequency range; Aperture in transfer tube on pipe 11 tube wall can absorb medium-high frequency pressure pulsation in pipe, it is slightly narrow that it absorbs frequency range, the frequency f that can dissipate as required carries out structural adjustment, and adjustable amount comprises the thickness of the annular chamber of the punching rate of transfer tube inner pipe wall, thickness and transfer tube, and formula is as follows:
Wherein, p represents the punching rate of butt tube inner tube wall, and b represents the thickness of butt tube inner pipe wall, and D represents the thickness of annular chamber in butt tube, and c represents the velocity of sound, L
kfor geometric properties coefficient;
Each subtube, transfer tube are docked according to designing requirement by their flange plate 4 by (4) the 4th steps successively;
End pipe 2 is welded with the pipe fitting connected in the 4th step by (5) the 5th steps, ensures pipeline centering;
The damping pipe fitting assembled entirety is connected with the fitting seat in monitoring system, the clear bottle blowing of nitrogen by (6) the 6th steps, can drop into monitoring.
Claims (8)
1. a pulsation monitoring damping pipe fitting, it is characterized in that, described damping pipe fitting is the straight line pipeline be made up of with the end pipe being positioned at described main pipeline two ends main pipeline, described main pipeline comprises tube wall and againsts the damping ring be made up of damping material arranged inside tube wall, the mouth of pipe of described end pipe is relative with the interior annular distance of described damping ring, forms the air-flow path that described damping pipe fitting internal diameter is well-balanced.
2. pulsation monitoring damping pipe fitting according to claim 1, it is characterized in that, described main pipeline is docked by some sections of subtubes and forms.
3. pulsation monitoring damping pipe fitting according to claim 2, it is characterized in that, described subtube is docked by transfer tube, described transfer tube comprises outer tube and interior pipe, interior pipe is positioned at outer tube, ends of tubes correspondence is connected and forms the end face of described transfer tube, an annular chamber closed is formed between two pipes, with the aperture both ends of the surface of described transfer tube being all provided with multiple and described annular chamber and being communicated with on the tube wall of described interior pipe, the mouth of pipe of described interior pipe is relative with the interior annular distance of described subtube internal damping ring, aperture in described transfer tube both ends of the surface is relative with the anchor ring of described subtube internal damping ring, described annular chamber is communicated with the Damping material layer in described subtube.
4. pulsation monitoring damping pipe fitting according to claim 3, it is characterized in that, the selection of described damping material is determined for absorbing the frequency of dissipation according to it, and the damping material in the subtube of described damping pipe fitting is identical or different.
5. pulsation according to claim 4 monitoring damping pipe fitting, is characterized in that, the described damping material that dissipates of the absorption for intermediate frequency adopts glass wool material, and the described damping material that dissipates of the absorption for low frequency adopts submissive type damping material.
6. the pulsation monitoring damping pipe fitting according to claim 3 or 4, it is characterized in that, the frequency f that the structure of described transfer tube dissipates as required adjusts, and formula is as follows:
Wherein, p represents the punching rate of transfer tube inner pipe wall, and b represents the thickness of transfer tube inner pipe wall, and D represents the thickness of annular chamber in transfer tube, and c represents the velocity of sound, L
kfor geometric properties coefficient.
7. pulsation monitoring damping pipe fitting according to claim 3, it is characterized in that, described transfer tube and described subtube are docked by flange arrangement.
8. pulsation monitoring damping pipe fitting according to claim 1, it is characterized in that, the structure of described end pipe is as follows: described end pipe is the pipeline section that one end is provided with ferrule structure, described end pipe also comprises a lock nut, lock nut is the female tubular structure of tool, lock nut is contained on described pipeline section by its bottom surface perforate flip sleeve, and opening end is outside, and the bottom surface of described tubular structure and described ferrule structure form the structure that offsets to prevent lock nut slippage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510197878.3A CN104930294B (en) | 2015-04-23 | 2015-04-23 | Damping pipe fitting for pulse monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510197878.3A CN104930294B (en) | 2015-04-23 | 2015-04-23 | Damping pipe fitting for pulse monitoring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104930294A true CN104930294A (en) | 2015-09-23 |
| CN104930294B CN104930294B (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510197878.3A Active CN104930294B (en) | 2015-04-23 | 2015-04-23 | Damping pipe fitting for pulse monitoring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546264A (en) * | 2015-12-31 | 2016-05-04 | 北京航空航天大学 | Multilateral overflow valve and multilateral overflow system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001065780A (en) * | 1999-09-01 | 2001-03-16 | Gijutsu Kaihatsu Sogo Kenkyusho:Kk | Pulsation damping device |
| CN2463660Y (en) * | 2000-12-22 | 2001-12-05 | 中国船舶重工集团公司第七研究院第七○四研究所 | Pipeline vibration and fluid pressure pulsation attenuator |
| CN201633772U (en) * | 2010-03-22 | 2010-11-17 | 奇瑞汽车股份有限公司 | Noise reduction device of automobile steering pipeline |
| DE202011002772U1 (en) * | 2011-02-15 | 2011-06-28 | FMP Technology GmbH Fluid Measurements & Projects, 91058 | Device for damping pressure pulsations |
| CN202442027U (en) * | 2012-02-27 | 2012-09-19 | 宁波市胜源技术转移有限公司 | Movable connector |
| CN104010898A (en) * | 2011-12-20 | 2014-08-27 | 罗伯特·博世有限公司 | Pressure pulsation damper for a vehicle brake system |
-
2015
- 2015-04-23 CN CN201510197878.3A patent/CN104930294B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001065780A (en) * | 1999-09-01 | 2001-03-16 | Gijutsu Kaihatsu Sogo Kenkyusho:Kk | Pulsation damping device |
| CN2463660Y (en) * | 2000-12-22 | 2001-12-05 | 中国船舶重工集团公司第七研究院第七○四研究所 | Pipeline vibration and fluid pressure pulsation attenuator |
| CN201633772U (en) * | 2010-03-22 | 2010-11-17 | 奇瑞汽车股份有限公司 | Noise reduction device of automobile steering pipeline |
| DE202011002772U1 (en) * | 2011-02-15 | 2011-06-28 | FMP Technology GmbH Fluid Measurements & Projects, 91058 | Device for damping pressure pulsations |
| CN104010898A (en) * | 2011-12-20 | 2014-08-27 | 罗伯特·博世有限公司 | Pressure pulsation damper for a vehicle brake system |
| CN202442027U (en) * | 2012-02-27 | 2012-09-19 | 宁波市胜源技术转移有限公司 | Movable connector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546264A (en) * | 2015-12-31 | 2016-05-04 | 北京航空航天大学 | Multilateral overflow valve and multilateral overflow system |
| CN105546264B (en) * | 2015-12-31 | 2018-09-07 | 北京航空航天大学 | Polygon overflow valve and polygon overflow system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104930294B (en) | 2017-03-22 |
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