CN103244461A - Low solidity blade diffuser and manufacturing method thereof - Google Patents
Low solidity blade diffuser and manufacturing method thereof Download PDFInfo
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- 238000009434 installation Methods 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 abstract description 16
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
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- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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Abstract
The invention provides a low-consistency blade diffuser and a manufacturing method thereof. The low consistency vane diffuser of the present invention is disposed between an outlet of an impeller of a compressor and an inlet of a scroll casing, and includes: the inlet is provided with no blade section and is communicated with the outlet of the impeller; the low-consistency blade section is internally provided with blades, and an inlet is communicated with an outlet of the bladeless section at the inlet; the outlet is provided with no blade section, the inlet is communicated with the outlet of the low-consistency blade section, and the outlet is communicated with the inlet of the volute. The invention has the main advantages that the low-consistency blades are adopted, the diffusion degree of the diffuser is improved, the power consumption of the compressor is reduced, and the efficiency is improved; the front and the rear of the blade section are respectively provided with the bladeless section to solve the defect of poor adaptability of the conventional blade diffuser under variable working conditions, reduce the impact loss under the variable working conditions and widen the working range of the compressor.
Description
Technical field
The present invention relates to the centrifugal compressor field, particularly a kind of low denseness vane diffuser and manufacture method thereof.
Background technique
According to statistics, the time of centrifugal refrigerating machines more than 90% is under the partial load condition to be moved, and the part load performance of its handpiece Water Chilling Units directly influences unit whole year operation power consumption.Regulation and the requirement of comprehensive part load performance coefficient IPLV are also proposed among the GB GB/T18430.1-2007 simultaneously.Therefore, for the design of centrifugal refigerating compressor, not only to guarantee higher full load efficient, and will pursue the performance index of sub load, also will guarantee wideer operating conditions scope simultaneously.
The reasonable use of Diffuser can make compressor have good performance.Because the air-flow that comes out from impeller also has very big airspeed, for the impeller of refrigeration compressor, its exit flow speed can be up to 100m/s.In order to reduce the loss, the air-flow velocity that general requirement enters condenser is 10～30m/s, if the air-flow of the so big speed of 100m/s is directly entered condenser, will cause very big kinetic energy rejection.Therefore, in order to reclaim this part kinetic energy, usually increase Diffuser in the impeller back, Diffuser form commonly used comprises vaneless diffuser or vane diffuser.
As shown in Figure 1, adopt the single-stage radial compressor of vaneless diffuser, its vaneless diffuser 70 is between impeller 40 outlets and spiral case 60 imports.The low-temperature low-pressure refrigerant steam that comes out from vaporizer is regulated and impeller 40 becomes the gas of high-voltage high-speed after doing work through stator (IGV) 50, enter vaneless diffuser 70, with the inlet flow extremely outlet of certain airflow direction angle from vaneless diffuser 70, speed reduces gradually, and pressure raises gradually.Not considering under the flow losses situation, along with the increase of diffuser exit external diameter, stream pressure raises.The gas that comes out from Diffuser 70 enters spiral case 60 at last, is discharged in the condenser after spiral case 60 is collected.
Vaneless diffuser comprises the annular pass that is made of two walls, and is simple in structure, and cost is low, performance curve is smooth, steady working condition wider range, and when Mach number Ma is higher, efficient reduces not obvious, and its shortcoming is constant substantially because of the airflow direction angle, and flow path is longer.Therefore frictional loss is big, if want to obtain higher diffusion degree, must do the external diameter of Diffuser very greatly, causes the boundary dimension of machine very big like this; And under design conditions, its efficient is lower than vane diffuser, and is hour more obvious at the airflow direction angle especially.
Vane diffuser is to load onto a series of blades in the annular space of above-mentioned vaneless diffuser, and it is strong to have the diffusion ability, the advantage that size is little, and its runner is short, and flow losses are little, thereby efficient is higher.Under design conditions, the comparable vaneless diffuser of its efficient is high by 3～5%, and at the airflow direction angle hour, vane diffuser efficient is higher especially.The shortcoming of vane diffuser is: because the existence of blade, during variable working condition the gas shock loss bigger, decrease in efficiency is obvious, when the angle of attack is big, easily produces serious separation in the runner especially, can cause the generation of surge.In addition, the diffusion action of vane diffuser mainly occurs in preceding half section, and more to the back, flow losses are more big, a little less than diffusion action just heals, so the way effect that single increase blade exit external diameter increases the diffusion degree is not remarkable.
Vane diffuser is compared vaneless diffuser and is had higher efficient, but variable working condition bad adaptability, the diffusion degree is influenced by blade exit external diameter diameter also, how to utilize vane diffuser not only to raise the efficiency but also guaranteed that wideer range of operation was the problem that prior art need solve.
Summary of the invention
The invention provides a kind of low denseness vane diffuser and manufacture method thereof, the existing vane diffuser efficient of solution is low, the shortcoming of variable working condition bad adaptability.
The present invention is achieved through the following technical solutions: a kind of low denseness vane diffuser, be arranged between the import of the outlet of impeller of compressor and spiral case, and comprising: import does not have the leaf section, and import is communicated with the outlet of impeller; Low denseness blade sections, inside arranges blade, and import is communicated with the outlet that import does not have the leaf section; Export no leaf section, import is communicated with the outlet of low denseness blade sections, and outlet is communicated with the import of spiral case.
Further, blade evenly distributes ringwise, and the blade chord length of blade and the ratio of blade pitgh are less than 1.5.
Further, import do not have a leaf section internal diameter by import to outlet convergence gradually.
Further, import does not have the wall of the wheel cap homonymy of leaf section and impeller and restrains gradually, with the wall of the wheel hub homonymy of impeller be straight wall.
Further, the exit port diameter ratio of blade is 1.15～1.32.
Further, the inlet angle of blade is 10 °～25 °, and exit angle is 25 °～35 °.
Further, the number of blade of blade is 7～13.
Further, the blade chord length of blade with the formula of the ratio of blade pitgh is:
Wherein, l is the blade chord length, and t is blade pitgh, and Z is blade quantity, D
4Be blade exit diameter, D
3Be blade inlet diameter, α
31Be inlet blade angle, α
4Be blade outlet angle.
Further, blade adopts wing blades.
According to a further aspect in the invention, a kind of manufacture method of low denseness vane diffuser is provided, comprise, the changeover portion process step, reserve low denseness blade sections at first plate, inlet's processing import in low denseness blade sections does not have the leaf section, does not have the leaf section in the outlet port export processing of low denseness blade sections; The blade processing step is processed equally distributed blade ringwise in low denseness blade sections; The combination installation steps are combined to form low denseness vane diffuser with second plate and first plate, are installed between the import of the outlet of compressor impeller and spiral case hanging down the denseness vane diffuser.
Further, the blade chord length of blade and the ratio of blade pitgh are less than 1.5.
By technique scheme, major advantage of the present invention is, 1, adopt low denseness blade, improve the diffusion degree of Diffuser, and the wasted work of compresses machine is raised the efficiency.2, set up the shortcoming that no leaf section solves common blade Diffuser variable working condition bad adaptability respectively in the front and back of blade sections, reduce the impact loss under the variable working condition, widen the compressor operating scope.
Description of drawings
The accompanying drawing that constitutes a part of the present invention is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 shows the general arrangement schematic of vaneless diffuser in compressor of prior art;
Fig. 2 shows the general arrangement schematic of low denseness vane diffuser in compressor of one embodiment of the present of invention;
Fig. 3 shows the side sectional view of the low denseness vane diffuser of one embodiment of the present of invention; And
Fig. 4 shows the plan view of the low denseness vane diffuser of one embodiment of the present of invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
The present invention adopts low denseness blade mainly to improve the diffusion degree, and before air-flow enters blade and after flowing out blade, all adopt vaneless diffuser to come uniform air flow to flow, reach whole Diffuser and in wideer range of operation proper functioning is arranged, and obtain diffusion degree efficiently, thereby reduce the compressor power consumption.
As Fig. 2, shown in Figure 3, low denseness vane diffuser of the present invention does not have leaf section 10, low denseness blade sections 20 and the no leaf section 30 of outlet by import and forms.Low denseness vane diffuser of the present invention mainly has following feature:
Import does not have leaf section 10 and is positioned at diffuser intake place, and joins with the outlet of impeller 40, adopts the form of convergence gradually with the wall of impeller 40 wheel cap homonymies.Preferably, the convergent angle of convergent walls is got 7 °～10 °, convergence diameter D3=(1.1～1.15) D2, and the seamed edge of converging portion adopts radius R 5～R10 round-corner transition.Preferably, adopt straight wall form with the wall of impeller hub homonymy, do not have leaf section 10 with the common import of forming low denseness vane diffuser of convergent walls, that is: the vaneless diffuser of reducing-pitch thread.Width b2 was not identical with the impeller outlet section before import had leaf section 10 convergence, and the width b3 need after the convergence be decided according to impeller width-diameter ratio b2/D2, and when b2/D2＞0.04, optimum value is b2/b3=0.8.When b2/D2≤0.04, get b2=b3 usually.Sometimes at b2/D2 hour, desirable b2＞b3.By there is not the design of leaf section 10 with upper inlet, under sub load, the inhomogeneous air-flow of high speed of impeller outlet is accelerated evenly by the effect of convergence, thereby improved the airflow state that enters blade, widen the operating range of Diffuser.
Low denseness blade sections 20 does not have leaf section 10 back along being connected to import, two walls all adopt straight wall form, and arbitrary wall adds upper blade 21 in two walls, this blade can evenly be loaded on Zhi Bishang by the form circumferencial direction of assembling, also can be integrally formed blade and straight wall by method for processing, by the combination of two walls, just be uniform-distribution with blade in the ring circumference in it so again, form blade diffusion passage.
As shown in Figure 4, blade 21 all adopts low denseness form, be that the vane diffuser that concerns l/t≤1.5 between blade chord length l and the blade pitgh t is called low denseness vane diffuser, l/t crosses the obstruction that conference increases Ye Dao inlet, strengthen loss, l/t is too small, and the diffusion ability reduces, and produces return loss in outlet.In order to obtain suitable value, adopt formula:
Its span is 0.7～1.2, and wherein l is the blade chord length, and t is blade pitgh, and Z is blade quantity, and value is the 7-13 sheet, and D4 is the blade exit diameter, and D3 is the blade inlet diameter, D4/D3 value: 1.15～1.32, α
31Be inlet blade angle, 10 °～25 ° of values, α
4Be how much angles of blade exit, 25 °～35 ° of values.Blade height is identical with the width that import does not have after the leaf section restrains, and is the b3 value.Preferably, for reducing flow losses, improve off design performance, vane type line adopts NACA65 (04) 06 wing blades.
Diffusion action by low denseness blade improves the pressure-recovery factor of Diffuser greatly, compares with vaneless diffuser, under the situation of obtaining identical diffusion performance, effectively reduces the contour structure size of compressor.Simultaneously, because α
31Get the small value, effectively avoid the return loss in the Diffuser under the sub load situation, adapt to the flowing state of sub load downstream more.
Because vane diffuser is to force air-flow to move along the direction that blade limits, air-flow at the blade exit place is relatively more disorderly, inhomogeneous, for making the air-flow that comes out from blade more evenly simultaneously also to the further diffusion of air-flow, the no leaf section 30 of outlet is set in the vane diffuser outlet port again, two walls adopt straight wall form, width b4 between two walls is highly identical with blade 21, i.e. b4=b3.Not having the low denseness vane diffuser that leaf section 10, low denseness blade sections 20, outlet leafing section 30 form by import makes Diffuser can both obtain preferable performance in very wide scope, thereby guarantee that compressor can both obtain good energy under different load, compressor operating is stable more, reliable.
Main innovate point of the present invention: 1) adopt low denseness blade, improve diffuser pressure recovery coefficient and the flow condition that improves the sub load air-flow; 2) the no leaf section of import reducing-pitch thread, low denseness blade sections and the no leaf section of outlet are combined, widen the operating range of Diffuser.
Make the manufacture method of low denseness vane diffuser of the present invention, specifically comprise following content:
1, whole low denseness vane diffuser forms by the steel plate system of milling;
2, mill at straight plate and make low denseness blade, and process reducing-pitch thread in inlet and do not have the leaf section, do not have the leaf section in the export processing of blade exit place;
3, can guarantee the integrity of changeover portion and blade diffuser by the system of milling of three sections Diffusers, also guarantee the degree of finish of whole Diffuser simultaneously;
4, will be fixed in the outlet port of impeller on the casing jointly by the bolt form with the straight wall of blade and another straight wall, the composition by two straight walls just forms and hangs down the denseness vane diffuser like this.
According to low denseness vane diffuser of the present invention, have following beneficial effect:
1, improve the diffusion degree of Diffuser, compressor monnolithic case structure reduces, thereby reduces development cost;
2, widen the operating range of Diffuser, make the compressor operating scope wideer, more reliable.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. one kind low denseness vane diffuser is arranged between the import of the outlet of impeller (40) of compressor and spiral case, it is characterized in that, comprising:
Import does not have leaf section (10), and import is communicated with the outlet of described impeller (40);
Low denseness blade sections (20), inside arranges blade (21), and import is communicated with the outlet that described import does not have leaf section (10);
Export no leaf section (30), import is communicated with the outlet of described low denseness blade sections (20), and outlet is communicated with the import of described spiral case.
2. low denseness vane diffuser according to claim 1 is characterized in that, described blade (21) evenly distributes ringwise, and the blade chord length of described blade (21) and the ratio of blade pitgh are less than 1.5.
3. low denseness vane diffuser according to claim 1 is characterized in that, described import does not have the internal diameter of leaf section (10) and restrained to outlet by import.
4. low denseness vane diffuser according to claim 1 is characterized in that, the exit port diameter ratio of described blade (21) is 1.15～1.32.
5. low denseness vane diffuser according to claim 1 is characterized in that, the inlet angle of described blade (21) is 10 °～25 °, and exit angle is 25 °～35 °.
6. low denseness vane diffuser according to claim 1 is characterized in that, the number of blade of described blade (21) is 7～13.
7. low denseness vane diffuser according to claim 2 is characterized in that, the blade chord length of described blade (21) with the formula of the ratio of blade pitgh is:
Wherein, l is the blade chord length, and t is blade pitgh, and Z is blade quantity, D
4Be blade exit diameter, D
3Be blade inlet diameter, α
31Be inlet blade angle, α
4Be blade outlet angle.
8. low denseness vane diffuser according to claim 7 is characterized in that, the blade chord length of described blade (21) is 0.7～1.2 with the scope of the ratio of blade pitgh.
9. low denseness vane diffuser according to claim 1 is characterized in that, described blade (21) adopts wing blades.
10. the manufacture method of a low denseness vane diffuser is characterized in that, comprising:
The changeover portion process step reserves low denseness blade sections (20) at first plate, does not have leaf section (10) in inlet's processing import of described low denseness blade sections (20), does not have leaf section (30) in the outlet port export processing of described low denseness blade sections (20);
The blade processing step is processed equally distributed blade (21) ringwise in described low denseness blade sections (20);
The combination installation steps are combined to form second plate and first plate and hang down the denseness vane diffuser, described low denseness vane diffuser are installed between the import of the outlet of compressor impeller (40) and spiral case.
11. the manufacture method of low denseness vane diffuser according to claim 10 is characterized in that, the blade chord length of described blade (21) and the ratio of blade pitgh are less than 1.5.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227359A (en) * | 2014-09-15 | 2014-12-24 | 重庆江增船舶重工有限公司 | Manufacturing method of centrifugal vapor compressor diffuser |
| CN105987023A (en) * | 2015-02-10 | 2016-10-05 | 沈阳透平机械股份有限公司 | Design method for low-consistency blade diffuser |
| CN107076159A (en) * | 2014-09-30 | 2017-08-18 | 西门子公司 | Multistage turbo-compressor or turbo-expander return level with coarse wall surface |
| CN107239641A (en) * | 2017-07-03 | 2017-10-10 | 沈阳鼓风机集团安装检修配件有限公司 | A kind of high-lift circulating pump hydraulic model of big flow determines method and device |
| CN109630468A (en) * | 2018-12-07 | 2019-04-16 | 中国科学院工程热物理研究所 | Diffuser positioning device |
| CN110307180A (en) * | 2018-03-27 | 2019-10-08 | 曼恩能源方案有限公司 | Radial compressor and turbocharger |
| CN110617239A (en) * | 2019-10-14 | 2019-12-27 | 尚科宁家(中国)科技有限公司 | Dust collector impeller and dust collector |
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| CN201330717Y (en) * | 2009-01-05 | 2009-10-21 | 珠海格力电器股份有限公司 | Adjustable centrifugal compressor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227359A (en) * | 2014-09-15 | 2014-12-24 | 重庆江增船舶重工有限公司 | Manufacturing method of centrifugal vapor compressor diffuser |
| CN107076159A (en) * | 2014-09-30 | 2017-08-18 | 西门子公司 | Multistage turbo-compressor or turbo-expander return level with coarse wall surface |
| CN105987023A (en) * | 2015-02-10 | 2016-10-05 | 沈阳透平机械股份有限公司 | Design method for low-consistency blade diffuser |
| CN105987023B (en) * | 2015-02-10 | 2018-04-24 | 沈阳透平机械股份有限公司 | The design method of low denseness vane diffuser |
| CN107239641A (en) * | 2017-07-03 | 2017-10-10 | 沈阳鼓风机集团安装检修配件有限公司 | A kind of high-lift circulating pump hydraulic model of big flow determines method and device |
| CN110307180A (en) * | 2018-03-27 | 2019-10-08 | 曼恩能源方案有限公司 | Radial compressor and turbocharger |
| CN109630468A (en) * | 2018-12-07 | 2019-04-16 | 中国科学院工程热物理研究所 | Diffuser positioning device |
| CN110617239A (en) * | 2019-10-14 | 2019-12-27 | 尚科宁家(中国)科技有限公司 | Dust collector impeller and dust collector |
| CN110617239B (en) * | 2019-10-14 | 2021-01-01 | 尚科宁家(中国)科技有限公司 | Dust collector impeller and dust collector |
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| CN103244461B (en) | 2016-03-30 |
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