CN111426463B - Device and method for testing hydraulic pressure resistance of jet needle of impulse turbine - Google Patents
Device and method for testing hydraulic pressure resistance of jet needle of impulse turbine Download PDFInfo
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- CN111426463B CN111426463B CN202010353213.8A CN202010353213A CN111426463B CN 111426463 B CN111426463 B CN 111426463B CN 202010353213 A CN202010353213 A CN 202010353213A CN 111426463 B CN111426463 B CN 111426463B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses a device and a method for testing the hydraulic pressure resistance of a nozzle needle of an impulse turbine, and relates to the technical field of impulse turbine equipment. A water pipe joint is arranged on a flange plugging plate of the device; the flange closure plate is fixed on the nozzle pipe, the spray needle sealing gasket is assembled on the spray needle head and fills a gap between the spray needle head and a nozzle opening, the electric pressure test oil pump is communicated with the spray needle oil supply pipe, one end of the manual pressure test water pump is communicated with the water pipe connector, and the other end of the manual pressure test water pump is communicated with the water source providing device through the water inlet valve. And (3) plugging the nozzle pipe by using a flange plugging plate, assembling a nozzle needle sealing gasket between the nozzle needle head and the nozzle opening to realize sealing, injecting water into the nozzle needle through the water pipe joint and pressurizing, and indicating that the assembly is complete if the pressure maintaining is successful. The spray needle is installed back to the front of the runner chamber for carrying out the water pressure resistance test, the maintenance workload can be effectively reduced, the maintenance efficiency is improved, the phenomenon that the maintenance period is delayed due to the reworking of the spray needle to influence the power generation production is avoided, and the method and the process are widely popularized and applied in the actual work.
Description
Technical Field
The invention relates to the technical field of impulse turbine equipment, in particular to a device and a method for testing the hydraulic pressure resistance of a jet needle of an impulse turbine.
Background
The maintenance of the hydroelectric generating sets is a fundamental work which must be carried out every year for the hydroelectric power plants, and is also a serious task every year. The maintenance time and the maintenance quality are related to the realization of various production and operation indexes all the year round. For a common small and medium-sized impact type water turbine generator set, an essential project for overhauling is the decomposition and inspection of a water turbine spray needle, and the spray needle is used as an important component of the water turbine and plays a role in water guide and load regulation. The spray needle is operated for a long time in the last flood season under high load, the easily damaged parts and the sealing parts in the spray needle are very easy to damage, and in addition, the spray needle is complex in structure, more in parts, difficult to disassemble and assemble, large in manpower and material resource investment and long in working time, so that the spray needle is a core project of the whole maintenance work.
Most of the parts inside the spray needle are in sliding fit, if the parts are used between the cavity and the piston shaft, between the piston shaft and the bushing, between the piston shaft and the balance sleeve, between the balance sleeve and the bushing, and between the balance sleeve and the fixed sleeve, the sliding fit is adopted, the sealing requirements among the matching surfaces are high, the types and the types of the sealing rings are different, the quantity is large, and the neglected installation and the wrong installation of the sealing rings can be caused by carelessness in the assembling process. Because the matching between the matching surfaces is tight, the gap is small, and the installed sealing ring is slightly higher than the matching surfaces, the sealing ring is very easy to block in the assembling process and can be assembled in place only by knocking. The sealing ring is easily damaged in the process, so that the sealing ring is torn, worn, extruded and twisted, and the sealing performance is lost. Thereby produce the water leakage phenomenon at the test stage of the needle water service action, lead to overhauing the rework, influence whole maintenance time limit for a project progress, greatly increased maintenance work load reduces equipment equivalence availability factor.
In order to solve the problems, the maintenance quality of the spray needle must be improved, the disassembly and assembly processes of the spray needle are reduced, the maintenance time is shortened, and the repair rework of the spray needle is avoided to the greatest extent. Therefore, it is very important to perform the hydrostatic test after the needle is disassembled and returned.
Disclosure of Invention
The invention aims to provide a device and a method for testing the hydraulic pressure resistance of a spray needle of an impulse turbine, and solves the problem of testing the hydraulic pressure resistance of the existing spray needle after maintenance.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a resistant water pressure test device of impulse turbine nozzle needle which characterized in that: the hydraulic pressure testing device comprises a flange blocking plate, a spray needle sealing gasket, an electric pressure testing oil pump and a manual pressure testing water pump, wherein a water pipe connector is arranged on the flange blocking plate; the flange closure plate is fixed on the nozzle pipe, the spray needle sealing gasket is assembled on the spray needle head and fills a gap between the spray needle head and a nozzle opening, the electric pressure test oil pump is communicated with the spray needle oil supply pipe, one end of the manual pressure test water pump is communicated with the water pipe connector, and the other end of the manual pressure test water pump is communicated with the water source providing device through the water inlet valve.
The further technical scheme is that the flange plugging plate is a circular flat plate, stud positioning holes are uniformly distributed along the radial direction, the water pipe joints are welded on the bottom surface of the flange plugging plate, the top surface of the flange plugging plate is inwards concave to form a groove, and a nozzle sealing gasket is arranged in the groove.
The flange blocking plate is provided with an exhaust port, and the exhaust port is communicated with an exhaust valve through a pipeline.
The still further technical scheme is that the nozzle needle sealing gasket is a polytetrafluoroethylene sealing gasket, the nozzle needle sealing gasket is circular, and a nozzle needle head yielding hole is formed in the center of the nozzle needle sealing gasket.
The invention also relates to a hydraulic pressure resistance test method for the injection needle of the impulse turbine, which is characterized by comprising the following steps:
s1: sleeving a spray needle sealing gasket on a spray needle head and placing the spray needle sealing gasket in a gap between the spray needle head and a nozzle opening, fixing a flange blocking plate on an assembly plane of a nozzle pipe, butting a water pipe of a manual pressure test water pump with a water pipe joint, and communicating an electric pressure test oil pump with an oil supply pipeline of the spray needle;
s2: starting the electric pressure test oil pump to enable the spray needle to be in a fully closed state, and checking whether a spray needle sealing gasket is intact;
s3: opening a water inlet valve, operating a manual pressure test water pump to carry out pressurization, and observing whether the flange blocking plate assembly surface, the nozzle head and the nozzle opening matching surface leak or not; after the pressure rises, observing whether the flange blocking plate is deformed or not and whether the drain outlet of the nozzle pipe leaks water or not;
s4: pressurizing to a rated water pressure, maintaining the pressure for 30-60 min, and observing whether the reading of a pressure gauge of the manual pressure test water pump changes;
s5: if the pressure is not changed, all the channels in the spray needle are well sealed, all parts are well matched, the installation is correct, and the spray needle can be put into use; if the pressure drops, which indicates that the internal seal is damaged or the installation is wrong, the spray needle needs to be disassembled and inspected again to eliminate the defects, and the step S1 is performed again after the refilling is finished until the pressure maintaining is successful.
The further technical scheme is that after the flange plugging plate is assembled in the step S1, the spray needle is lifted to be slightly separated from the ground and placed at an angle of 45-60 degrees with the ground
A further technical scheme is that the water inlet valve is opened and the exhaust valve is opened at the same time in the step S3, and the exhaust valve is closed until water overflows from the exhaust valve.
The working principle is as follows: the nozzle pipe is blocked by a flange blocking plate, a nozzle needle sealing gasket is assembled between a nozzle needle head and a nozzle opening, and the nozzle needle is sealed after being closed, so that water cannot enter and flow out through a gap between the nozzle needle head and the nozzle opening. And injecting water into the spray needle through the water pipe joint and pressurizing, wherein if the spray needle is completely assembled, the pressure maintaining is successful, otherwise, the spray needle needs to be disassembled and then checked again to remove the defects.
Compared with the prior art, the invention has the beneficial effects that: the device and the method have the advantages that the sealing of the spray needle is realized through the flange blocking plate and the spray needle sealing gasket, the opening and closing of the spray needle are controlled through the electric pressure test oil pump, and water is injected into the spray needle through the manual pressure test water pump to complete pressure maintaining detection.
Drawings
FIG. 1 is a schematic view showing the structure of a hydraulic pressure resistance test apparatus according to the present invention.
Fig. 2 is a schematic structural view of the flange closure of the present invention.
FIG. 3 is a schematic view showing the assembly of the needle gasket of the present invention.
FIG. 4 is a flow chart of the hydraulic resistance test method of the present invention.
FIG. 5 is a view showing a state of use of the water pressure resistance test apparatus of the present invention.
In the figure: 1-flange blocking plate, 101-stud positioning hole, 102-groove, 2-spray needle sealing gasket, 3-electric pressure test oil pump, 4-manual pressure test water pump, 5-water pipe joint, 6-spray nozzle pipe, 7-spray needle head, 8-spray nozzle sealing gasket, 9-exhaust valve, 10-water inlet valve and 11-spray nozzle opening.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Fig. 1-3 and 5 show a hydraulic pressure test device for a jet needle of an impulse turbine, which comprises a flange closure plate 1, a jet needle sealing gasket 2, an electric pressure test oil pump 3 and a manual pressure test water pump 4, wherein a water pipe joint 5 is arranged on the flange closure plate 1; the flange closure plate 1 is fixed on the nozzle pipe 6, the spray needle sealing gasket 2 is assembled on the spray needle head 7 and filled in a gap between the spray needle head 7 and the nozzle opening 11, the electric pressure test oil pump 3 is communicated with the spray needle oil supply pipe, one end of the manual pressure test water pump 4 is communicated with the water pipe connector 5, and the other end of the manual pressure test water pump is communicated with the water source providing device through the water inlet valve 10.
As shown in fig. 2, the flange closure plate 1 is a circular flat plate and stud positioning holes 101 are uniformly distributed along the radial direction, the water pipe joints 5 are welded on the bottom surface of the flange closure plate 1, the top surface of the flange closure plate 1 is recessed inwards to form a groove 102, and a nozzle sealing gasket 8 is arranged in the groove 102. An air outlet is formed in the flange plugging plate 1 and communicated with an exhaust valve 9 through a pipeline.
As shown in fig. 3, the needle gasket 2 is a teflon gasket, and the needle gasket 2 is circular and has a needle head relief hole in the center. The sealed 2 covers of spray needle is sealed to be filled up on spray needle 7, and when the spray needle was closed, spray needle 7 forward motion for water can't be through the clearance between spray needle 7 and the nozzle opening 11, ensures that flange closure plate 1 and nozzle opening 11 closely cooperate, and withstand voltage stage leakproofness is good, the subsequent resistant water pressure test of being convenient for on pressing on nozzle opening 11.
The steps of the hydraulic pressure resistance test method of the impulse turbine nozzle needle are shown in fig. 4, and specifically comprise the following steps:
s1: the nozzle sealing gasket 8 is arranged in a groove 102 on the flange plugging plate 1 for preventing the flange plugging plate 1 and the nozzle pipe 6 from water leakage. Then the spray needle is lifted slightly away from the ground, and the spray needle is arranged obliquely, and forms an included angle of 45-60 degrees with the ground, as shown in figure 5. And finally, butting a water pipe of the manual pressure test water pump 4 with the water pipe joint 5, and communicating the electric pressure test oil pump 3 with the spray needle oil supply pipeline.
S2: starting the electric pressure test oil pump 3 to enable the spray needle to be in a fully closed state, and checking whether the spray needle sealing gasket 2 is intact; if the needle is damaged, the needle is opened, the needle sealing gasket 2 is replaced, and if the needle is intact, the next step is carried out.
S3: and opening the water inlet valve 10 and the air outlet valve 9, enabling water to enter the spray needle, and exhausting air in the spray needle through the air outlet valve 9 until the air is completely exhausted, wherein the total exhaustion of the air is indicated that water overflows from the air outlet valve 9, and at the moment, closing the air outlet valve 9. And (3) manually operating the manual pressure test water pump 4 to pressurize, observing whether the assembly surface of the flange blocking plate 1 and the matching surface of the spray needle head 7 and the nozzle opening 11 have leakage or not when the pressure is pressurized to 20-30% of the rated water pressure, stopping the water pressure resistance test when the leakage occurs, and disassembling the spray needle to perform decomposition and inspection until the defects are eliminated. If no leakage occurs, observing whether the flange blocking plate 1 is deformed or not and whether the drain outlet of the nozzle pipe 6 leaks water or not at any time after the pressure is increased to 50%; if so, stopping the water pressure resistance test, disassembling the spray needle for decomposition inspection until the defects are eliminated, and if not, carrying out the next step.
S4: and (5) pressurizing to a rated water pressure, maintaining the pressure for 30-60 min, and observing whether the reading of a pressure gauge of the manual pressure testing water pump 4 changes.
S5: if the pressure is not changed, all the channels in the spray needle are well sealed, all parts are well matched, the installation is correct, and the spray needle can be put into use; if the pressure drops, which indicates that the internal seal is damaged or the installation is wrong, the spray needle needs to be disassembled and inspected again to eliminate the defects, and the step S1 is performed again after the refilling is finished until the pressure maintaining is successful.
The spray needle is installed back to the front of the runner chamber for carrying out the water pressure resistance test, the maintenance workload can be effectively reduced, the maintenance efficiency is improved, the phenomenon that the maintenance period is delayed due to the reworking of the spray needle to influence the power generation production is avoided, and the method and the process are widely popularized and applied in the actual work.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a resistant water pressure test device of impulse turbine nozzle needle which characterized in that: the device comprises a flange blocking plate (1), a spray needle sealing gasket (2), an electric pressure test oil pump (3) and a manual pressure test water pump (4), wherein a water pipe connector (5) is arranged on the flange blocking plate (1); the flange closure plate (1) is fixed on a nozzle pipe (6), a spray needle sealing gasket (2) is assembled on a spray needle head (7) and fills a gap between the spray needle head (7) and a nozzle opening (11), an electric pressure test oil pump (3) is communicated with a spray needle oil supply pipe, one end of a manual pressure test water pump (4) is communicated with a water pipe connector (5), and the other end of the manual pressure test water pump is communicated with a water source providing device through a water inlet valve (10); the top surface of the flange plugging plate (1) is inwards concave to form a groove (102), and a nozzle sealing gasket (8) is arranged in the groove (102); the spray needle sealing gasket (2) is circular and a spray needle head yielding hole is formed in the center.
2. The impulse turbine needle water pressure resistance test device according to claim 1, characterized in that: the flange plugging plate (1) is a circular flat plate, stud positioning holes (101) are uniformly distributed along the radial direction, and the water pipe connectors (5) are welded on the bottom surface of the flange plugging plate (1).
3. The impulse turbine needle water pressure resistance test device according to claim 2, characterized in that: an exhaust port is formed in the flange plugging plate (1), and the exhaust port is communicated with an exhaust valve (9) through a pipeline.
4. The impulse turbine needle water pressure resistance test device according to claim 1, characterized in that: the nozzle needle sealing gasket (2) is a polytetrafluoroethylene sealing gasket.
5. A method for testing the water pressure resistance of a jet needle of an impulse turbine is characterized by comprising the following steps:
s1: sleeving a spray needle sealing gasket (2) on a spray needle head (7) and placing the spray needle sealing gasket in a gap between the spray needle head (7) and a nozzle opening (11), fixing a flange plugging plate (1) on an assembly plane of a nozzle pipe (6), butting a water pipe of a manual pressure test water pump (4) with a water pipe joint (5), and communicating an electric pressure test oil pump (3) with an oil supply pipeline of the spray needle;
s2: starting the electric pressure test oil pump (3) to enable the spray needle to be in a fully closed state, and checking whether the spray needle sealing gasket (2) is intact;
s3: opening a water inlet valve (10), operating a manual pressure test water pump (4) to pressurize, and observing whether the assembling surface of the flange blocking plate (1), the matching surface of the spray needle head (7) and the nozzle pipe (6) leaks or not when the pressure is between 20 and 30 percent of the rated water pressure; after the pressure rises to 50%, observing whether the flange blocking plate (1) is deformed or not and whether the drain outlet of the nozzle pipe (6) leaks water or not;
s4: pressurizing to a rated water pressure, maintaining the pressure for 30-60 min, and observing whether the reading of a pressure gauge of the manual pressure test water pump (4) changes;
s5: if the pressure is not changed, all the channels in the spray needle are well sealed, all parts are well matched, the installation is correct, and the spray needle can be put into use; if the pressure drops, which indicates that the internal seal is damaged or the installation is wrong, the spray needle needs to be disassembled and inspected again to eliminate the defects, and the step S1 is performed again after the refilling is finished until the pressure maintaining is successful.
6. The impulse turbine needle water pressure resistance test method according to claim 5, characterized in that: and S1, after the flange plugging plate (1) is assembled, lifting the spray needle to enable the spray needle to slightly leave the ground and to be placed at an angle of 45-60 degrees with the ground.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010353213.8A CN111426463B (en) | 2020-04-29 | 2020-04-29 | Device and method for testing hydraulic pressure resistance of jet needle of impulse turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010353213.8A CN111426463B (en) | 2020-04-29 | 2020-04-29 | Device and method for testing hydraulic pressure resistance of jet needle of impulse turbine |
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| CN111426463A CN111426463A (en) | 2020-07-17 |
| CN111426463B true CN111426463B (en) | 2022-05-17 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202284976U (en) * | 2011-10-25 | 2012-06-27 | 重庆立崧电机设备有限公司 | Detection device for nozzle sliding seal leakage |
| CN205120322U (en) * | 2015-11-22 | 2016-03-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Nozzle hydraulical pressure test apparatus |
| CN106525344A (en) * | 2016-12-14 | 2017-03-22 | 新乡市恒星科技有限责任公司 | Shield tail grease anti-hydraulic pressure sealing property test device |
| CN107860661A (en) * | 2017-10-25 | 2018-03-30 | 李厚兵 | A kind of high pressure resistant oil-gas pipeline hydraulic pressure testing device |
| CN207689087U (en) * | 2017-12-15 | 2018-08-03 | 中天建设集团浙江安装工程有限公司 | A kind of valve pressure detection device |
| CN209992303U (en) * | 2019-03-29 | 2020-01-24 | 中国能源建设集团安徽电力建设第二工程有限公司 | Special tool for pipeline hydrostatic test |
| CN212134042U (en) * | 2020-04-29 | 2020-12-11 | 金平国能电冶开发有限公司 | Impact type hydraulic turbine spray needle hydrostatic test device |
-
2020
- 2020-04-29 CN CN202010353213.8A patent/CN111426463B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202284976U (en) * | 2011-10-25 | 2012-06-27 | 重庆立崧电机设备有限公司 | Detection device for nozzle sliding seal leakage |
| CN205120322U (en) * | 2015-11-22 | 2016-03-30 | 沈阳黎明航空发动机(集团)有限责任公司 | Nozzle hydraulical pressure test apparatus |
| CN106525344A (en) * | 2016-12-14 | 2017-03-22 | 新乡市恒星科技有限责任公司 | Shield tail grease anti-hydraulic pressure sealing property test device |
| CN107860661A (en) * | 2017-10-25 | 2018-03-30 | 李厚兵 | A kind of high pressure resistant oil-gas pipeline hydraulic pressure testing device |
| CN207689087U (en) * | 2017-12-15 | 2018-08-03 | 中天建设集团浙江安装工程有限公司 | A kind of valve pressure detection device |
| CN209992303U (en) * | 2019-03-29 | 2020-01-24 | 中国能源建设集团安徽电力建设第二工程有限公司 | Special tool for pipeline hydrostatic test |
| CN212134042U (en) * | 2020-04-29 | 2020-12-11 | 金平国能电冶开发有限公司 | Impact type hydraulic turbine spray needle hydrostatic test device |
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| CN111426463A (en) | 2020-07-17 |
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