CN109834027A - A method of turbine chamber, which is repaired, using high molecular material cavitates - Google Patents
A method of turbine chamber, which is repaired, using high molecular material cavitates Download PDFInfo
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- CN109834027A CN109834027A CN201910131575.XA CN201910131575A CN109834027A CN 109834027 A CN109834027 A CN 109834027A CN 201910131575 A CN201910131575 A CN 201910131575A CN 109834027 A CN109834027 A CN 109834027A
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- high molecular
- molecular material
- spreading
- cavitation erosion
- turbine chamber
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Abstract
The invention discloses a kind of methods for repairing turbine chamber cavitation erosion using high molecular material, comprising the following steps: polishing pretreatment: is handled using derusting by sandblasting runner envelope cavitation range；Surface cleaning: the region and its near zone that have carried out blasting treatment are cleaned using detergent；Condiment: the base-material of two-component high molecular material and curing agent are sufficiently mixed in proportion；Spreading: the coating mixed up is subjected to spreading, the spreading number of plies is no less than two layers, and spreading to viscous shape material is slightly above runner chamber surface；Solidification and post-processing: after the completion of spreading, to restoring area carry out curing process, it is to be solidified completely after, surface polish；This improves the smoothness of runner chamber surface using the method that high molecular material repairs turbine chamber cavitation erosion, hydraulic loss is reduced, recovery technique construction is simple avoids the construction of gouge, welding or other complex processes, the labor intensity for reducing maintenance construction, also saves a large amount of maintenance fund.
Description
Technical field
The present invention relates to rotary wheel of water turbine to repair field, and in particular to a kind of to repair rotary wheel of water turbine using high molecular material
The method of room cavitation erosion.
Background technique
The unit of Turbine Runner room is in long-term high water head operational process, and a large amount of bubbles occurs in tail water, and water is in hydraulic turbine stream
When flowing through pressure in road lower than pressure for vaporization area, the water flowed through from paddle clearance, which boils vaporization, generates bubble, and generates
Local assault pressure makes metal surface by shock loading repeatedly, damages to runner envelope material, leads to metallic crystal gas
Erosion falls off.As shown in Figures 2 and 3, there is the cavitation erosion hole of large area in turbine chamber back boxing upper and lower part.
It is that unit maximum head in actual moving process has been set more than maximum sometimes when power plant tail water water level constantly reduces
Head is counted, unit cavitation will be aggravated in this way, makes the reduction of runner envelope mechanical strength, while unit flow passage will be further increased
The roughness of part increases head loss, reduces unit efficiency, influence unit output and safe and stable operation.
The construction for generally using gouge, welding or other complex processes, maintenance construction are repaired in existing turbine chamber cavitation erosion
Large labor intensity, while needing a large amount of maintenance fund.
Summary of the invention
The purpose of the present invention is to solve defects in the prior art, and the labor intensity for providing a kind of maintenance construction is low,
The method for repairing turbine chamber cavitation erosion of maintenance fund is saved, simultaneously to solve problems of the prior art.
To achieve the above object, technical scheme is as follows:
A method of turbine chamber, which is repaired, using high molecular material cavitates, comprising the following steps:
S1. polishing pretreatment: runner envelope cavitation range is handled using derusting by sandblasting；
S2. surface cleaning: the region and its near zone that have carried out blasting treatment are cleaned using detergent；
S3. condiment: the base-material of two-component high molecular material and curing agent are sufficiently mixed in proportion；
S4. spreading: carrying out spreading for the coating mixed up, and the spreading number of plies is no less than two layers, and spreading to viscous shape material slightly above turns
Take turns chamber surface；
S5. solidify and post-process: after the completion of spreading, to restoring area carry out curing process, it is to be solidified completely after, to table
Face polish.
In order to further realize the present invention, after derusting by sandblasting processing, the metal in area to be repaired should meet claimed below:
(1) expose metal true qualities；
(2) surface roughness is greater than 75 microns；
(3) non-corroding object and other peculiar smell for influencing construction effect in cavitation erosion hole.
In order to further realize the present invention, when derusting by sandblasting is handled, the local lighting of Ying Peibei sealed beam is matched simultaneously
The standby major light with protective cover.
In order to further realize the present invention, cleaning agent is acetone, in use, acetone is poured into container, with dry wipe pair
The region and its near zone for having carried out blasting treatment are cleaned, and the side Bian Qingjie checks rag, until rag face
Until color base this presentation true qualities.
In order to further realize the present invention, dry wipe is white dry wipe.
In order to further realize the present invention, two-component high molecular material is Belzona 1341 or Belzona 1311.
In order to further realize the present invention, when condiment, if environment temperature is lower than 10 degrees Celsius, material is heated to 20-25
Degree Celsius when carry out ingredient, condiment again.
In order to further realize the present invention, application step concrete operations are as follows: will not carry out sandblasting with cloth base adhesive tape first and beat
The position of mill is clung, and the coating mixed up is carried out first pass to cavitation range with tool and is uniformly smeared, and first pass smearing should ensure that
Coating with buffed surface is fully effective contacts, guarantee that cavitation erosion pit-hole is filled up by high molecular material, then carry out multipass smearing, operate
Method is identical as first pass smearing method, and spreading to viscous shape material is slightly above runner chamber surface.
In order to further realize the present invention, the thickness of every layer of application layer is in 0.5mm or more.
In order to further realize the present invention, curing process is carried out using light bulb, heater or natural air drying curing mode.
Beneficial effect
The present invention uses high molecular material reparation, improves the smoothness of runner chamber surface, reduces hydraulic loss, through length
The abnormal phenomenon such as shelling, chap will not occur in time use；It is multiple to avoid gouge, welding etc. for this recovery technique construction is simple
The construction of general labourer's skill reduces the labor intensity of maintenance construction, a large amount of maintenance fund is also saved, with huge economy
Benefit and social benefit.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is rotary wheel of water turbine cavitation erosion schematic diagram；
Fig. 3 is another cavitation erosion schematic diagram of rotary wheel of water turbine.
Specific embodiment
The following examples are further illustrations of the invention, rather than limiting the invention.
Embodiment one
As shown in Figure 1, the method that the present invention repairs turbine chamber cavitation erosion using high molecular material, including following step
It is rapid:
Step 1, polishing pretreatment, is handled runner envelope cavitation range using derusting by sandblasting, is removed in cavitation range
Rust, oxide layer and greasy dirt etc.；
To guarantee sandblasting amount during derusting by sandblasting, at the uniform velocity be operated, after derusting by sandblasting processing, in area to be repaired
Metal be polishing to meet it is claimed below:
1. exposing metal true qualities；
2. surface roughness is greater than 75 microns；
3. non-corroding object and other peculiar smell for influencing construction effect in the hole that cavitates.
To guarantee that repair materials come into full contact with cavitation erosion part, the effect of the adhesive capacity of reinforcing material is reached.
Polishing pretreatment is an important ring and comparatively laborious working procedure during cavitation erosion repairing construction, to repairing
Multiple quality also functions to critical effect, and derusting by sandblasting process well should close operating location, and effect scene will have good
Good visibility and uniform illuminance, shadow-free；Specifically, the local lighting of Ying Peibei sealed beam, while being equipped with band
The major light of protective cover, to pack the quality of sandblasting operation.In addition, the personnel of sandblasting operation must be with the helmet, mask, protection
The protective articles such as clothing, muffler, prevent dust pollution from injuring.
Surface cleaning: step 2 cleans the region and its near zone that have carried out blasting treatment using detergent；
Specifically, which uses acetone, in use, acetone is poured into container, with dry wipe to having sprayed
The region of sand processing and its near zone are cleaned, and the side Bian Qingjie checks rag, until rag color is presented substantially
Until true qualities；It is preferential to use white dry wipe.
Detergent generally just will can be completely dried and volatilize by 20 minutes, and surface to be cleaned just can be carried out after thoroughly drying
Otherwise the coating of high molecular material will affect high molecular material absorption and bonding quality, and influence the materials'use service life.
Condiment: step 3 the base-material of two-component high molecular material and curing agent is sufficiently mixed in proportion；Specifically
Ground, two-component high molecular material be Belzona 1341 or 1311 ceramics R metal material of Belzona 1311, Belzona and
1341 superslide wear-resistant macromolecule coating of Belzona is the macromolecule repair materials that Belzona company, the U.S. produces, by double groups
Part high molecular material is reconciled in the ratio of 5:1, guarantees that material color is uniform, otherwise will bonding loosely or setting time lengthens,
To influence the quality or construction speed of construction.
If environment temperature is lower than 10 degrees Celsius when condiment, when material can be heated to 20-25 degrees Celsius with hot hair dryer again
Carry out ingredient, condiment.
One time condiment amount should not be excessive, ready-to-use, to prevent material hardening, causes to waste, while should be strictly control
The time is expected, to reserve the more operating time to next process.
Spreading: the coating mixed up is carried out spreading, the spreading number of plies is no less than two layers, and spreading is slightly higher to viscous shape material by step 4
In runner chamber surface, the thickness of every layer of application layer is in 0.5mm or more.
Specifically application step is first to be clung the position for not carrying out sandblasting polishing with cloth base adhesive tape, will be adjusted with tool
Good coating carries out first pass to cavitation range and uniformly smears, and first pass smearing should ensure that coating and buffed surface is fully effective connects
Touching guarantees that cavitation erosion pit-hole is filled up by high molecular material, then carries out multipass smearing, operating method and first pass smearing method phase
Together, and guarantee the thickness of every layer of application layer in 0.5mm or more, spreading to viscous shape material is slightly above runner chamber surface.
Step 5, solidification and post-processing: after the completion of spreading, to restoring area carry out curing process, it is to be solidified completely after,
Surface polish.
Specifically, after the completion of spreading, restoring area is solidified with modes such as light bulb, heater or natural air drying solidifications
Processing, curing time at least keep 12 hours, to improve the mechanical performance of repair materials, do not need to carry out after the completion of solidification other
Construction, adhesive tape is removed.It is band coating be fully cured after, the continuity and integrality entirely brushed are detected, are used in combination
Fine sandpaper R80 polish to surface, does smooth transition processing in contact surface.
It needs to measure coating layer thickness after the completion, thickness must not exceed the gap between runner and web, to meet
The normal operation of unit；Otherwise it needs to be polished again, be required until meeting unit design and operating normally.
The place that need to pay special attention to is: because showing the brittleness of similar ceramics after material solidification, constructing in maintenance
In the process, weight and sharp object should be avoided in restoring area to hit, otherwise will lead to repair layer and falls off or fragmentation.
Using high molecular material reparation, the smoothness of runner chamber surface is improved, reduces hydraulic loss, through a long time makes
With will not occur shelling, chap etc. abnormal phenomenon；This recovery technique construction is simple avoids gouge, welding or other complex processes
Construction, reduce the labor intensity of maintenance construction, also save a large amount of maintenance fund, with huge economic benefit and
Social benefit.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (10)
1. a kind of method for repairing turbine chamber cavitation erosion using high molecular material, which comprises the following steps:
S1. polishing pretreatment: runner envelope cavitation range is handled using derusting by sandblasting；
S2. surface cleaning: the region and its near zone that have carried out blasting treatment are cleaned using detergent；
S3. condiment: the base-material of two-component high molecular material and curing agent are sufficiently mixed in proportion；
S4. spreading: the coating mixed up is subjected to spreading, the spreading number of plies is no less than two layers, and spreading to viscous shape material is slightly above runner envelope
Surface；
S5. solidify and post-process: after the completion of spreading, to restoring area carry out curing process, it is to be solidified completely after, to surface into
Row polishes.
2. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
After derusting by sandblasting processing, the metal in area to be repaired should meet claimed below:
(1) expose metal true qualities；
(2) surface roughness is greater than 75 microns；
(3) non-corroding object and other peculiar smell for influencing construction effect in cavitation erosion hole.
3. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
When derusting by sandblasting is handled, the local lighting of Ying Peibei sealed beam, while being equipped with the major light with protective cover.
4. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
Cleaning agent uses acetone, in use, acetone is poured into container, with dry wipe to the region that has carried out blasting treatment and its attached
Near field is cleaned, and the side Bian Qingjie checks rag, until true qualities are presented substantially in rag color.
5. the method according to claim 4 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
Dry wipe is white dry wipe.
6. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
Two-component high molecular material is Belzona 1341 or Belzona 1311.
7. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
When condiment, if environment temperature is lower than 10 degrees Celsius, ingredient, condiment are carried out again when material is heated to 20-25 degrees Celsius.
8. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
Application step concrete operations are as follows: first clung the position for not carrying out sandblasting polishing with cloth base adhesive tape, the painting that will be mixed up with tool
Material carries out first pass to cavitation range and uniformly smears, first pass smearing should ensure that coating with buffed surface is fully effective contacts, guarantee
Cavitation erosion pit-hole is filled up by high molecular material, then carries out multipass smearing, operating method is identical as first pass smearing method, spreading
It is slightly above runner chamber surface to viscous shape material.
9. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, which is characterized in that
The thickness of every layer of application layer is in 0.5mm or more.
10. the method according to claim 1 for repairing turbine chamber cavitation erosion using high molecular material, feature exist
In using light bulb, heater or natural air drying curing mode progress curing process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910131575.XA CN109834027A (en) | 2019-02-22 | 2019-02-22 | A method of turbine chamber, which is repaired, using high molecular material cavitates |
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| CN201910131575.XA CN109834027A (en) | 2019-02-22 | 2019-02-22 | A method of turbine chamber, which is repaired, using high molecular material cavitates |
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| CN109834027A true CN109834027A (en) | 2019-06-04 |
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| CN201910131575.XA Pending CN109834027A (en) | 2019-02-22 | 2019-02-22 | A method of turbine chamber, which is repaired, using high molecular material cavitates |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111229566A (en) * | 2020-03-31 | 2020-06-05 | 国家电网有限公司 | Cavitation defect repairing coating for flow passage component of water turbine and preparation method thereof |
| CN112295877A (en) * | 2020-10-23 | 2021-02-02 | 云南华电鲁地拉水电有限公司 | Method for preventing local cavitation of flow passage component of water turbine |
| CN112760039A (en) * | 2019-11-06 | 2021-05-07 | 山东翰硕新材料科技有限公司 | Nano polymer metal repairing agent and repairing method |
| CN116876888A (en) * | 2023-06-30 | 2023-10-13 | 中国长江电力股份有限公司 | Construction method for dismantling runner chamber of hydroelectric generating set |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005011879A1 (en) * | 2003-07-25 | 2005-02-10 | Analytical Services & Materials, Inc. | Erosion-resistant silicone coatings for protection of fluid-handling parts |
| CN104439878A (en) * | 2014-10-20 | 2015-03-25 | 广东梅雁吉祥水电股份有限公司 | Method for repairing cavitation damaged face of turbine runner |
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2019
- 2019-02-22 CN CN201910131575.XA patent/CN109834027A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005011879A1 (en) * | 2003-07-25 | 2005-02-10 | Analytical Services & Materials, Inc. | Erosion-resistant silicone coatings for protection of fluid-handling parts |
| CN104439878A (en) * | 2014-10-20 | 2015-03-25 | 广东梅雁吉祥水电股份有限公司 | Method for repairing cavitation damaged face of turbine runner |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112760039A (en) * | 2019-11-06 | 2021-05-07 | 山东翰硕新材料科技有限公司 | Nano polymer metal repairing agent and repairing method |
| CN111229566A (en) * | 2020-03-31 | 2020-06-05 | 国家电网有限公司 | Cavitation defect repairing coating for flow passage component of water turbine and preparation method thereof |
| CN112295877A (en) * | 2020-10-23 | 2021-02-02 | 云南华电鲁地拉水电有限公司 | Method for preventing local cavitation of flow passage component of water turbine |
| CN116876888A (en) * | 2023-06-30 | 2023-10-13 | 中国长江电力股份有限公司 | Construction method for dismantling runner chamber of hydroelectric generating set |
| CN116876888B (en) * | 2023-06-30 | 2024-03-29 | 中国长江电力股份有限公司 | Construction method for dismantling runner chamber of hydroelectric generating set |
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Application publication date: 20190604 |
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