CN202468472U - Low consistency blade diffuser - Google Patents
Low consistency blade diffuser Download PDFInfo
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- CN202468472U CN202468472U CN2012200473590U CN201220047359U CN202468472U CN 202468472 U CN202468472 U CN 202468472U CN 2012200473590 U CN2012200473590 U CN 2012200473590U CN 201220047359 U CN201220047359 U CN 201220047359U CN 202468472 U CN202468472 U CN 202468472U
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- 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
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model provides a low consistency blade diffuser. The utility model discloses a low consistency blade diffuser sets up between the export of the impeller of compressor and the import of spiral case, include: 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 utility model has the main advantages that the low-consistency blade is 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 utility model relates to the centrifugal compressor field, particularly a kind of low denseness vane diffuser.
Background technique
According to statistics, the time of centrifugal refrigerating machines more than 90% is in operation under the partial load condition, 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 the operating conditions scope of broad simultaneously.
The reasonable use of Diffuser can make compressor have good performance.Because the air-flow that from impeller, comes out 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 fitness for purpose 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 at the back at impeller, Diffuser form commonly used comprises vaneless diffuser or vane diffuser.
As shown in Figure 1, the single-stage radial compressor of employing 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 the gas that becomes high-voltage high-speed after doing work with impeller 40 through stator (IGV) 50; Get into 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 at last gets into spiral case 60, after spiral case 60 is collected, is discharged in the condenser.
Vaneless diffuser comprises the annular pass that is made up 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 basically because of the airflow direction angle, and flow path is longer.Therefore frictional loss is big, if seek out 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 in the annular space of above-mentioned vaneless diffuser, to load onto a series of blades, 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, is prone in the runner produce serious separation 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 big more, 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 also receives blade exit external diameter diameter influences, how to utilize vane diffuser not only to raise the efficiency but also guaranteed that the range of operation of broad was the problem that existing technology need solve.
The model utility content
The utility model provides a kind of low denseness vane diffuser, and the existing vane diffuser efficient of solution is low, the shortcoming of variable working condition bad adaptability.
The utility model is realized through following technological scheme: a kind of low denseness vane diffuser, be arranged between the import of outlet and spiral case of impeller of compressor, and comprising: import does not have the leaf section, and import is communicated with the outlet of impeller; Low denseness blade sections, the set inside blade, 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 a blade pitgh, and Z is a 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.
Through technique scheme, the major advantage of the utility model 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 the part of the utility model is used to provide the further understanding to the utility model, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 shows the general arrangement schematic of vaneless diffuser in compressor of existing technology;
Fig. 2 shows an embodiment's of the utility model the general arrangement schematic of low denseness vane diffuser in compressor;
Fig. 3 shows an embodiment's of the utility model the side sectional view of low denseness vane diffuser; And
Fig. 4 shows an embodiment's of the utility model the plan view of low denseness vane diffuser.
Embodiment
Embodiment to the utility model is elaborated below in conjunction with accompanying drawing, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
The utility model adopts low denseness blade to come the main diffusion degree that improves; And before air-flow gets into blade with after flowing out blade, all adopt vaneless diffuser to come uniform air flow to flow; Reach whole Diffuser and proper functioning is all arranged in the range of operation of broad; And obtain diffusion degree efficiently, thereby reduce the compressor power consumption.
Like Fig. 2, shown in Figure 3, the low denseness vane diffuser of the utility model does not have leaf section 10, low denseness blade sections 20 and the no leaf section 30 of outlet by import and forms.The low denseness vane diffuser of the utility model mainly has following characteristic:
Import does not have leaf section 10 and is positioned at diffuser intake place, and joins with the outlet of impeller 40, adopts convergent form 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, 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 with the wall of impeller hub homonymy.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 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 hour, desirable b2＞b3 at b2/D2.Through there is not the design of leaf section 10 with upper inlet, under sub load, can make the inhomogeneous air communication of high speed of impeller outlet cross convergent effect quickening evenly, thereby improve the airflow state that gets into 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 in two walls, add upper blade 21 on arbitrary wall, and this blade can evenly be loaded on Zhi Bishang through the form circumferencial direction of assembling; Also can be integrally formed blade with straight wall through method for processing; Through 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, and promptly 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, and 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 a blade pitgh, and Z is a blade quantity, and value is the 7-13 sheet, D
4Be the blade exit diameter, D3 is the blade inlet diameter, the D4/D3 value: 1.15～1.32, and 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 through 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; More evenly the while is provided with no leaf section 30, two walls of outlet again and adopts straight wall form also to the further diffusion of air-flow in the vane diffuser outlet port in order to make the air-flow that comes out from blade; 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 formed through import makes Diffuser in very wide scope, can both obtain preferable performance; Thereby guarantee that compressor can both obtain good energy under different load, compressor operating is stable more, reliable.
The main innovate point of the utility model: 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 production method of the low denseness vane diffuser of the utility model, specifically comprise following content:
1, whole low denseness vane diffuser forms through the steel plate system of milling;
2, on straight plate, mill 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 through 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 through the bolt form with the straight wall of blade and another straight wall, the composition through two straight walls just forms and hangs down the denseness vane diffuser like this.
Low denseness vane diffuser according to the utility model has 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 preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (9)
1. one kind low denseness vane diffuser is arranged between the import of outlet and spiral case of impeller (40) of compressor, it is characterized in that, comprising:
Import does not have leaf section (10), and import is communicated with the outlet of said impeller (40);
Low denseness blade sections (20), set inside blade (21), import is communicated with the outlet that said import does not have leaf section (10);
Export no leaf section (30), import is communicated with the outlet of said low denseness blade sections (20), and outlet is communicated with the import of said spiral case.
2. low denseness vane diffuser according to claim 1 is characterized in that, said blade (21) evenly distributes ringwise, and the blade chord length of said 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, said 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 said blade (21) is 1.15～1.32.
5. low denseness vane diffuser according to claim 1 is characterized in that, the inlet angle of said 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 said blade (21) is 7～13.
7. low denseness vane diffuser according to claim 2 is characterized in that, the blade chord length of said blade (21) with the formula of the ratio of blade pitgh is:
Wherein, I is the blade chord length, and t is a blade pitgh, and Z is a 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 said 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, said blade (21) adopts wing blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200473590U CN202468472U (en) | 2012-02-14 | 2012-02-14 | Low consistency blade diffuser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200473590U CN202468472U (en) | 2012-02-14 | 2012-02-14 | Low consistency blade diffuser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244461A (en) * | 2012-02-14 | 2013-08-14 | 珠海格力电器股份有限公司 | Low solidity blade diffuser and manufacturing method thereof |
| CN104358710A (en) * | 2014-09-20 | 2015-02-18 | 潍坊富源增压器有限公司 | Turbocharger |
| 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 |
| CN106958538A (en) * | 2017-05-11 | 2017-07-18 | 美的集团股份有限公司 | Centrifugal blower and the dust catcher with it |
-
2012
- 2012-02-14 CN CN2012200473590U patent/CN202468472U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244461A (en) * | 2012-02-14 | 2013-08-14 | 珠海格力电器股份有限公司 | Low solidity blade diffuser and manufacturing method thereof |
| CN103244461B (en) * | 2012-02-14 | 2016-03-30 | 珠海格力电器股份有限公司 | Low solidity blade diffuser and manufacturing method thereof |
| CN104358710A (en) * | 2014-09-20 | 2015-02-18 | 潍坊富源增压器有限公司 | Turbocharger |
| 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 |
| CN106958538A (en) * | 2017-05-11 | 2017-07-18 | 美的集团股份有限公司 | Centrifugal blower and the dust catcher with it |
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Granted publication date: 20121003 |
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| CX01 | Expiry of patent term |