CN109869348A - A kind of large size fluoroplastics liner spiral case and preparation method thereof - Google Patents
A kind of large size fluoroplastics liner spiral case and preparation method thereof Download PDFInfo
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- CN109869348A CN109869348A CN201910193795.5A CN201910193795A CN109869348A CN 109869348 A CN109869348 A CN 109869348A CN 201910193795 A CN201910193795 A CN 201910193795A CN 109869348 A CN109869348 A CN 109869348A
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Abstract
The present invention relates to a kind of large-scale fluoroplastics liner spiral cases and preparation method thereof, including metal spiral case, plastic lining layer is provided on the inner wall of the metal spiral case, the metal spiral case includes upper semi spiral case and lower semi spiral case, the plastic lining layer be by several pieces of prefabricated profiled plastic plate linings in the metal spiral case.When preparation, it is segmented production liner spiral case with plastic plate, then prefabricated profiled plastic plate is respectively corresponded and is bumped into upper semi spiral case and lower semi spiral case, is then welded and fixed, forms complete liner spiral case.The present invention can not only increase substantially the Forming Quality of liner spiral case, abrasion strength resistance, improve product working efficiency indirectly, be easily installed, dismantle, save occupied area, also improve the stability of complete machine operation.
Description
Technical field
The present invention relates to centrifugal pump spiral casing manufacturing field more particularly to a kind of large-scale fluoroplastics centrifugal pump liner spiral case and its
Preparation method.
Background technique
Fluoroplastics centrifugal pump is widely used in China's petrochemical industry, metallurgy industry, mainly convey sulfuric acid, nitric acid, chloroazotic acid, highly basic,
The strong corrosive medias such as strong oxidizer have many advantages, such as long service life, anti-corrosion, wear-resistant.
The manufacture difficulty of large-scale lining plastic corrosion protection pump is mainly the lining of the spiral case pumped, and the shape of lining is by opening metal mold processed
It is made up after tool of processes such as heating, hot melt, molding, demoulding, processing, but this lining production method has the disadvantage that one
Aspect, the liner spiral case of fluoroplastic pump can generate different degrees of thermal contraction after high temperature and pressure compression molding, cause finally at
Part shape deviates the Hydraulic Design requirement, to influence its hydraulic performance.On the other hand, since the molding of conventional volute liner is using whole
The once molding formed method of body, and consider the working environment of corrosive medium, lining material generally selects super high molecular weight poly-
Ethylene, melting means number is extremely low, and material flowability is poor, causes the characteristic of this material can be because tight when entering the deep of pump case lining
The insufficient pressure of weight causes lining crystallization poor, and the great number of issues such as tissue looseness, more, the wear-resisting property difference of bubble seriously affect pump
Quality.
Summary of the invention
The object of the present invention is to provide a kind of a kind of large-scale fluoroplastics liner snails that can increase substantially product efficiency
Shell and preparation method thereof.
For achieving the above object, the technical scheme adopted by the invention is as follows: a kind of large size fluoroplastics liner spiral case, including
Metal spiral case, is provided with plastic lining layer on the inner wall of the metal spiral case, and the metal spiral case includes upper semi spiral case and lower semi spiral case,
The plastic lining layer be by several pieces of prefabricated profiled plastic plate linings in the metal spiral case.
In above scheme, by being welded and fixed between the plastic lining layer and the metal spiral case.
In above scheme, several cavitys are respectively equipped on the surface that the plastic lining layer and the metal spiral case contact with each other,
Solidity body is filled between the plastic lining layer and the metal spiral case, in each cavity.
In above scheme, the section of the cavity is laciniation, cavity and the metal snail on the plastic lining layer
Cavity on shell is not on a horizontal line.
In above scheme, the structure of the delivery chamber of the metal spiral case is spiral shape, the metal spiral case and the liner
Each section configuration of layer is rectangle.
The present invention also provides a kind of preparation methods of large-scale fluoroplastics liner spiral case, include the following steps: to use plastic plate
Material segmentation production liner spiral case, then prefabricated profiled plastic plate is respectively corresponded and is bumped into upper semi spiral case and lower semi spiral case, so
After be welded and fixed, form complete liner spiral case.
In above scheme, with plastic plate be segmented production liner spiral case technique are as follows: by the plastic plate of required size from
It cuts on tetrafluoro polyethylene board, be put into electrically-controlled heating oven, 180-220 DEG C, then constant temperature 2 hours are heated up to, to plastics
It is taken out after plate softening, and with stock mould by the plastic board bend forming of softening, and cooling and shaping.
In above scheme, opened on the inner peripheral surface of the metal spiral case and the outer circumference surface of each corresponding plastic plate
Have cavity 4, be poured solidity body after being welded and fixed between metal spiral case and liner spiral case so that metal spiral case and liner spiral case it
Between the full all cavitys of solidity body filling.
In above scheme, the process of optimization of the liner spiral case are as follows: S1: pass through the fluid emulation software of profession
FLUENT couples solid-liquid two-phase flow medium with temperature field, calculates two-phase solid-liquid fluid domain, analyzes its inside stream
, including solid phase particles concentration distribution and each Domain Volume score, and by the abrasion prediction model inside FLUENT to initial
Liner spiral case carry out abrasion loss assessment, make a prediction to lift and efficiency；S2: software building liner snail is analyzed by SPSS
Mathematic(al) representation between each parameter of shell and optimization aim, i.e. response surface model；S3: using MATLAB software that above three is excellent
Change target and be unified into single optimization aim, and optimizing is carried out to the new response surface model of generation, obtains the optimal of liner spiral case
Parameter combination；S4: it is fabricated according to optimum results.
In above scheme, each parameter of liner spiral case includes liner pumping chamber of scroll casing outer wall width B1, liner spiral case pressure
Water chamber entrance width B2, liner pumping chamber of scroll casing internal diameter D1, each cross sectional radii R of liner spiral case spiral casei, cut water radius r is described excellent
Changing target includes efficiency eta, lift H, wear rate Er
Beneficial effects of the present invention: 1. compared to two-phase stainless steel making large centrifugal pump, pass through technique, manufacture
Large-scale fluoroplastics centrifugal pump price economy out, wear-and corrosion-resistant, and the significant increase quality of product guarantee that pump machine is normally transported
Row, meets environmental requirement；2. can weld the new liner of lining again after the abrasion of pump case liner and utilize again；3. compared to biography
The metal spiral case and liner volute structure of system, laciniation are more advantageous to the flowing of solidity body, can be sufficient filling in metal snail
Between shell and liner spiral case, guarantee the installation of liner spiral case, the safety of operation, stability.4. compared to front and back folder and left and right
The spiral case of folder, using the structure pressed from both sides up and down, the work such as installation, disassembly can carry out in vertical direction, reduce occupied area, because
This, largely improves economic results in society.5. the large-scale fluoroplastics for combining the software designs such as FLUENT, MATLAB to go out from
Heart pump is while with outstanding antiseptic property, it is ensured that the abrasion resistance properties of liner spiral case, therefore have very long use
Service life.
Detailed description of the invention
Fig. 1 is plastic lining layer structure optimization flow chart in the present invention.
Fig. 2 is large-scale fluoroplastics centrifugal pump main view.
Each sectional schematic diagram of Fig. 3 metal spiral case.
Fig. 4 is partial cutaway enlarged view in Fig. 2.
In figure: 1. metal spiral cases；2. plastic lining layer；3. solidity body；4. cavity；Semi spiral case on 11.；12. lower semi spiral case.
Specific embodiment
The present invention is further illustrated in the following with reference to the drawings and specific embodiments.
As shown in Figure 2 and Figure 4, a kind of large-scale fluoroplastics liner spiral case of the present embodiment, including metal spiral case 1, the gold
Belong to and be provided with plastic lining layer 2 on the inner wall of spiral case 1, the metal spiral case 1 includes upper semi spiral case 11 and lower semi spiral case 12, the lining plastic
Layer 2 is fixed by several pieces of prefabricated profiled plastic plate linings in the metal spiral case 1 and through welding.The lining
Several cavitys 4 are respectively equipped on the surface that modeling layer 2 and the metal spiral case 1 contact with each other, the section of the cavity 4 of the present embodiment is
Laciniation, and the cavity 4 on the cavity 4 on plastic lining layer 2 and the metal spiral case 1 is on a horizontal line, and leads to
One will be adhered between metal spiral case 1 and liner layer 2 by crossing casting solidity body 3, solidity body 3 between metal spiral case 1 and plastic lining layer 2
It rises, and tightly fills the cavity 4 of full laciniation, such mechanism is more conducive to improve between metal spiral case 1 and liner layer 2
The intensity of bonding ensure that the safety and stability of pump operation.
As shown in figure 3, the structure of the delivery chamber of metal spiral case 1 is spiral shape in the present embodiment, section configuration is rectangle, and
Width is 260mm, and each cross-sectional area calculates as follows:
(kv3--- empirical coefficient, g --- local gravity coefficient, h --- rated head)
(QⅧ--- the inflow-rate of water turbine of VIII section, Q --- design discharge,--- cut water and the VIIIth section
Between angle)
Then FⅧ=QⅧ/v3(FⅧ--- the area of VIII section)
Other cross-sectional areas can utilize formulaIt is calculated.
After calculating there emerged a the area of section, the calculation formula of cross-sectional area is released according to selected rectangular cross section, is calculated
Radius of each section apart from axial line,
Wherein b3For pumping chamber entrance width, B is impeller outlet width,For each cross-sectional area, r3For base radius
By calculating each section:
Ith section RⅠ=270.3mm；IIth section RⅡ=290.3mm；IIIth section RⅢ=310.3mm；IVth section RⅣ
=325.4mm；Vth section RⅤ=350.4mm；VIth section RⅥ=363.5mm；VIIth section RⅦ=408.5mm；VIIIth is disconnected
Face RⅧ=435mm.The connection arc radius of each section
In the present embodiment, preferably plastic lining layer is tetrafluoro polyethylene, and the liner spiral case cut water axial plane shape is semicircle, every
Tongue laying angle is 35 °, it is contemplated that the pump is large-scale centrifugal pump of single stage type, to reduce noise, vibration and the cavitation occurred at cut water,
Compared to Ordinary Centrifugal Pumps, it is k that cut water, which places specific location,2r3(k2--- empirical coefficient, k2=1.09).The liner spiral case
02 is formed by prefabricated profiled several pieces of plastic plate weldings.The method of production is by the plastic plate of required size from tetrafluoro
It cuts on polyethylene board, place into electrically-controlled heating oven, 180-220 DEG C, then constant temperature 2 hours are heated up to, to plastic plate
It is taken out after material softening, then with stock mould by the plastic board bend forming of softening, and cooling and shaping, then by corresponding plastic plate
Material is bumped into metal pump case, then is welded, and after welding completion, solidity tree is filled in the gap of plastic inner lining and anti-corrosion interlayer
Rouge is attached positioning, after resin solidification, then polished, machining is to get to final products, to play etch-proof
Function.The inner peripheral surface of the metal spiral case and the outer circumference surface of plastic plate are equipped with cavity 4, preferably the section shape of cavity 4
Shape is zigzag, facilitates solidity body and is sufficient filling between metal spiral case 1 and liner layer 2, improves metal spiral case 1 and liner layer
Adhesive strength between 2, solves that current liner spiral case fluorine material is uneven, the technological deficiencies such as easy to fall off, ensure that pump operation
Safety and stability.
As shown in Figure 1, the determination of above-mentioned plastic lining layer structural parameters carries out in the steps below:
1) solid-liquid two-phase flow medium is coupled with temperature field by the fluid emulation software FLUENT of profession, to solid-liquid
Two-phase fluid domain is calculated, and analyzes its interior flow field, including solid phase particles concentration distribution and each Domain Volume score, and pass through
Abrasion prediction model inside FLUENT carries out the assessment of abrasion loss to initial plastic lining layer, and then optimizes its structural parameters；
2) each parameter of software building spiral case (liner pumping chamber of scroll casing outer wall width B is analyzed by SPSS1, liner spiral case pressure
Water chamber entrance width B2, liner pumping chamber of scroll casing internal diameter D1, each cross sectional radii R of liner spiral case spiral casei, cut water radius r) and optimization
Target, i.e. efficiency eta, lift H, the mathematic(al) representation between wear rate Er, i.e. response surface model:
f1(x)=H=
+444.79981-5.38123B1-12.72104B2+4.84795D1+6.62610∑Ri+10.43142r+
0.011821B1B2+0.018782B1D1-8.42762B1∑Ri+3B1*r+3.82703B2D1-
7.50781B2∑Ri-0.015698B2D1-4.20213D1∑Ri-0.084938D1r-
2.26438∑Rir
f2(x) η=+ 62.41-0.30B1+0.048B2+0.90D1-0.13∑Ri-0.30r+1.64B1B2+
0.96B1D1-0.48B1∑Ri+1.13B1r+0.13B2D1+0.23B2∑Ri+0.10B2r-
0.048D1∑Ri-2.15D1r+0.24∑Rir-0.16D1 2-0.055B1 2-0.46B2 2-0.075r2
f3(x) Er=-129.99645+0.16066B1+1.00928B2-0.057474D1-0.13743∑Ri+
0.099532r-7.05851B1B2-3.66147B1D1+1.64337B1D-6.82088B2D1-
5.67164B2∑Ri-9.90533B2r+4.58518B2F+1.16705D1r-2.07333∑Rir+
4.50249B1 2-1.095423B2 2+3.198584D1 2+3.761084∑Ri 2+2.63141r2
3) above three optimization aim is unified into single optimization aim using MATLAB software, and to the new sound of generation
It answers surface model to carry out optimizing, obtains the best parameter group of liner spiral case；
Optimization process
Formula
In formula, F (x)=[f1(x),f2(x),f3(x)】T(F (x)=ω1f1(x)+ω2f2(x)+ω3f3(x)
) it is three-dimensional vector, i.e. there are three objective functions, respectively efficiency eta, lift H, wear rate in objective function F (x)
Er。
B1--- liner pumping chamber of scroll casing outer wall width；
B2--- liner pumping chamber of scroll casing entrance width；
D1--- liner pumping chamber of scroll casing internal diameter；
Ri--- each cross sectional radii of liner spiral case spiral case；
R --- cut water radius；
ωi--- the weight factor of each objective function.
Wherein, ω1=0.3, ω2=0.3, ω3=0.4, obtain best parameter group are as follows: B1=220mm, B2=72mm,
D1=450mm, R1=243.8mm, R2=264.4mm, R3=279.6mm, R4=300.7mm, R5=326.3mm, R6=
351.9mm, R7=376.5mm, R8=401.8mm, r=4mm；
4) it is fabricated according to optimum results.
Claims (10)
1. a kind of large size fluoroplastics liner spiral case, including metal spiral case (1), lining is provided on the inner wall of the metal spiral case (1)
It moulds layer (2), which is characterized in that the metal spiral case (1) includes upper semi spiral case (11) and lower semi spiral case (12), the plastic lining layer
It (2) is interior in the metal spiral case (1) by several pieces of prefabricated profiled plastic plate linings.
2. a kind of large-scale fluoroplastics liner spiral case according to claim 1, which is characterized in that the plastic lining layer (2) and institute
It states between metal spiral case (1) by being welded and fixed.
3. a kind of large-scale fluoroplastics liner spiral case according to claim 1 or 2, which is characterized in that the plastic lining layer (2) and
It is respectively equipped with several cavitys (4) on the surface that the metal spiral case (1) contacts with each other, the plastic lining layer (2) and the metal snail
Solidity body (3) are filled between shell (1), in each cavity (4).
4. a kind of large-scale fluoroplastics liner spiral case according to claim 3, which is characterized in that the section of the cavity (4)
For laciniation, the cavity (4) on cavity (4) and the metal spiral case (1) on the plastic lining layer (2) is not in a level
On line.
5. a kind of large-scale fluoroplastics liner spiral case according to claim 1 or 2, which is characterized in that the metal spiral case (1)
The structure of delivery chamber be spiral shape, the metal spiral case (1) and the liner layer (2) each section configuration are rectangle.
6. a kind of preparation method of large size fluoroplastics liner spiral case, includes the following steps: to be segmented production liner snail with plastic plate
Shell, then prefabricated profiled plastic plate is respectively corresponded and is bumped into upper semi spiral case (11) and lower semi spiral case (12), then welded
Fixation is connect, complete liner spiral case is formed.
7. a kind of preparation method of large-scale fluoroplastics liner spiral case according to claim 6, which is characterized in that use plastic plate
The technique of material segmentation production liner spiral case are as follows: cut from tetrafluoro polyethylene board by the plastic plate of required size, put
Enter in electrically-controlled heating oven, be heated up to 180-220 DEG C, then constant temperature 2 hours, taken out after plastic plate softening, and will with stock mould
The plastic board bend forming of softening, and cooling and shaping.
8. a kind of preparation method of large-scale fluoroplastics liner spiral case according to claim 6, which is characterized in that the metal
Cavity (4) are provided on the inner peripheral surface of spiral case and the outer circumference surface of each corresponding plastic plate, in metal after being welded and fixed
Solidity body is poured between spiral case and liner spiral case, so that the solidity body filling between metal spiral case and liner spiral case is full all recessed
Chamber.
9. a kind of preparation method of large-scale fluoroplastics liner spiral case according to claim 6, which is characterized in that the liner
The process of optimization of spiral case are as follows: S1: by the fluid emulation software FLUENT of profession by solid-liquid two-phase flow medium and temperature field
It is coupled, two-phase solid-liquid fluid domain is calculated, analyze its interior flow field, including solid phase particles concentration distribution and each region
Volume fraction, and the assessment of abrasion loss is carried out by the abrasion prediction model inside FLUENT to initial liner spiral case, to raising
Journey and efficiency are made a prediction；S2: the mathematical table between each parameter of software building liner spiral case and optimization aim is analyzed by SPSS
Up to formula, i.e. response surface model；S3: above three optimization aim is unified into single optimization aim using MATLAB software, and right
The new response surface model generated carries out optimizing, obtains the best parameter group of liner spiral case；S4: added according to optimum results
Work manufacture.
10. a kind of preparation method of large-scale fluoroplastics liner spiral case according to claim 9, which is characterized in that in described
Serving as a contrast each parameter of spiral case includes liner pumping chamber of scroll casing outer wall width B1, liner pumping chamber of scroll casing entrance width B2, liner spiral case pressure water
Indoor diameter D1, each cross sectional radii R of liner spiral case spiral casei, cut water radius r, the optimization aim includes efficiency eta, lift H, wear rate
Er。
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| CN201910193795.5A CN109869348A (en) | 2019-03-14 | 2019-03-14 | A kind of large size fluoroplastics liner spiral case and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4264273A (en) * | 1975-06-13 | 1981-04-28 | Warman International Limited | Casing and casing liners for centrifugal pumps of the volute type |
| CN102913483A (en) * | 2012-10-22 | 2013-02-06 | 宜兴市宙斯泵业有限公司 | Large plastic-lining anticorrosion pump and manufacturing method thereof |
| CN202914394U (en) * | 2012-10-22 | 2013-05-01 | 宜兴市宙斯泵业有限公司 | Large anti-corrosion pump lined with plastic |
| CN204572561U (en) * | 2015-04-13 | 2015-08-19 | 宜兴市宙斯泵业有限公司 | A kind of large-scale plastic-lining centrifugal pump |
-
2019
- 2019-03-14 CN CN201910193795.5A patent/CN109869348A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4264273A (en) * | 1975-06-13 | 1981-04-28 | Warman International Limited | Casing and casing liners for centrifugal pumps of the volute type |
| CN102913483A (en) * | 2012-10-22 | 2013-02-06 | 宜兴市宙斯泵业有限公司 | Large plastic-lining anticorrosion pump and manufacturing method thereof |
| CN202914394U (en) * | 2012-10-22 | 2013-05-01 | 宜兴市宙斯泵业有限公司 | Large anti-corrosion pump lined with plastic |
| CN204572561U (en) * | 2015-04-13 | 2015-08-19 | 宜兴市宙斯泵业有限公司 | A kind of large-scale plastic-lining centrifugal pump |
Non-Patent Citations (1)
| Title |
|---|
| 黄思: "《流体机械数值仿真研究及应用》", 31 October 2015 * |
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Application publication date: 20190611 |