CN202468473U - Tandem vaned diffuser - Google Patents

Tandem vaned diffuser Download PDF

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Publication number
CN202468473U
CN202468473U CN2012200477036U CN201220047703U CN202468473U CN 202468473 U CN202468473 U CN 202468473U CN 2012200477036 U CN2012200477036 U CN 2012200477036U CN 201220047703 U CN201220047703 U CN 201220047703U CN 202468473 U CN202468473 U CN 202468473U
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CN
China
Prior art keywords
blade
tandem
diffuser
outlet
inlet
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Withdrawn - After Issue
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CN2012200477036U
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Chinese (zh)
Inventor
钟瑞兴
张治平
蒋楠
谢蓉
蒋彩云
傅鹏
闫秀兵
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN2012200477036U priority Critical patent/CN202468473U/en
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Publication of CN202468473U publication Critical patent/CN202468473U/en
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Abstract

The utility model provides a tandem vaned diffuser which is arranged between the outlet of a compressor impeller and the inlet of a scroll casing, and comprises an inlet vaneless section, a tandem vane section and an outlet vaneless section; the inlet of the inlet vaneless section is communicated with the outlet of the impeller; a plurality of groups of vanes are arranged inside the tandem vane section, each group of vanes are distributed uniformly in a circular shape, the vanes are arranged at intervals, and the inlet of the tandem vane section is communicated with the outlet of the inlet vaneless section; and the inlet of the outlet vaneless section is communicated with the outlet of the tandem vane section, and the outlet of the outlet vaneless section is communicated with the inlet of the scroll casing. The tandem vaned diffuser has the main advantages that a plurality of groups of tandem vanes are adopted, so that the diffusion degree of the diffuser is improved, the wasted work of a compressor is reduced, and the efficiency is improved; and the vaneless sections are respectively arranged in front of and behind the vane section additionally, so that the defect that the adaptability of a conventional vane diffuser is poor under variable working conditions is overcome, impact losses under various working conditions are reduced, and the scope of work of the compressor is expanded.

Description

The tandem blade Diffuser
Technical field
The utility model relates to the centrifugal compressor field, particularly a kind of tandem blade 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 tandem blade 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 tandem blade Diffuser, be arranged between the import of outlet and spiral case of compressor impeller, and comprising: import does not have the leaf section, and import is communicated with the outlet of impeller; The tandem blade section, 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 tandem blade section, and outlet is communicated with the import of spiral case; Wherein, many group blades are set in the tandem blade section, each group blade evenly distributes ringwise, organizes each interval layout between the blade more.
Further, import do not have a leaf section internal diameter by import to outlet convergence gradually.
Further, blade comprises first group of blade and second group of blade.
Further, the angle between first group of blade and the second group of blade string of a musical instrument is 10 °~14 °.
Further, the exit port diameter ratio of first group of blade is that the exit port diameter ratio of 1.1~1.3, second group of blade is that 1.25~1.35, second group of blade inlet diameter is 0.9~1.1 with first group of blade exit diameter ratio.
Further, the inlet angle of every group of blade is 10 °~25 °, and exit angle is 25 °~35 °.
Further, the number of blade of every group of blade is 7~13.
Further, the blade chord length of every group of blade is less than 1.5 with the ratio of blade pitgh.
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 Go outBe blade exit diameter, D AdvanceBe blade inlet diameter, α AdvanceBe inlet blade angle, α Go outBe blade outlet angle.
Further, blade adopts wing blades.
Through technique scheme, the major advantage of the utility model is, 1, adopt many group tandem blades, 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 tandem blade Diffuser in compressor;
Fig. 3 shows an embodiment's of the utility model the side sectional view of tandem blade Diffuser;
Fig. 4 shows an embodiment's of the utility model the plan view of tandem blade Diffuser;
Fig. 5 shows the boundary layer schematic representation of the vane diffuser blade-section of existing technology; And
Fig. 6 shows an embodiment's of the utility model the boundary layer schematic representation of blade-section of tandem blade 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 the low denseness blade of tandem type 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 tandem blade Diffuser of the utility model does not have leaf section 10, tandem blade section 20 and the no leaf section 30 of outlet by import and forms.The tandem blade 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, become the import of tandem type vane diffuser not have leaf section 10 with the convergent walls mutual group, 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.
Tandem blade section 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, tandem blade 21 is provided with two groups in a circumferential direction, and every group of blade evenly distributes separately ringwise, and two row blade separation, and second group of blade 212 of a slice promptly is set in the gap of each blade of first group of blade 211.Wherein the interlobate angle γ of two row is: 10 °~14 °, first group of blade 211 exit port diameter compares D 32/ D 3Value: 1.1~1.3, second group of blade 212 exit port diameter compares D 4/ D 31Value: 1.25~1.35, second group of blade 212 inlet diameter compares D with first group of blade 211 outlet diameter 31/ D 32Value: 0.9~1.1, every row number of blade Z is respectively 7~13, inlet blade angle α separately 31, α 33Value: 10 °~25 °, angle of impeller outlet alpha 32, α 4Value: 25 °~35 °, two row blade heights are all identical with the width that import does not have after leaf section 10 restrains, and are the b3 value.Two row blades 21 all adopt 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, strengthens loss, and l/t is too small; 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, D Go outBe the blade exit diameter, like the D among Fig. 3 32Or D 4, D AdvanceBe the blade inlet diameter, like the D among Fig. 4 3Or D 31, α AdvanceFor how much angles of blade import, like the α among Fig. 3 31Or α 33, α Go outFor how much angles of blade exit, like the α among Fig. 3 32Or α 4Preferably, for reducing flow losses, improve off design performance, vane type line adopts NACA65 (04) 06 wing blades.
Like Fig. 5, contrast shown in Figure 6; Front and back through two row tandem blades are arranged; The air-flow that first group of blade 211 comes out has souring to the boundary layer on second group of blade 212, and the tandem blade Diffuser is worked and the unlikely boundary layer separation that causes under bigger diffusion degree.The boundary layer mobility status of vane diffuser of the prior art has been shown among Fig. 5, and boundary layer separates serious.The tandem blade Diffuser of the utility model shown in Fig. 6, the boundary layer separation is able to control.The pressure-recovery factor of Diffuser is improved greatly, improve the efficient of vane diffuser under big diffusion degree greatly, compare, under the situation of obtaining identical diffusion performance, effectively reduce the contour structure size of compressor with vaneless diffuser.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 tandem blade Diffuser that leaf section 10, tandem blade section 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 tandem blade, improve diffuser pressure recovery coefficient and the flow condition that improves the sub load air-flow; 2) no leaf section, tandem blade section and the no leaf section of outlet with the import reducing-pitch thread combines, and widens the operating range of Diffuser.
Make the production method of the tandem blade Diffuser of the utility model, specifically comprise following content:
1, whole tandem blade Diffuser forms through the steel plate system of milling;
2, on straight plate, mill and make tandem 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 integral body 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 the tandem blade Diffuser like this.
Tandem blade 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 (10)

1. tandem blade Diffuser is arranged between the import of outlet and spiral case of compressor impeller (40), it is characterized in that, comprising:
Import does not have leaf section (10), and import is communicated with the outlet of said impeller (40);
Tandem blade section (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 tandem blade section (20), and outlet is communicated with the import of said spiral case;
Wherein, many group blades (21) are set in the said tandem blade section (20), each group blade (21) evenly distributes ringwise, organizes each interval layout between the said blade (21) more.
2. tandem blade Diffuser according to claim 1 is characterized in that, said import does not have the internal diameter of leaf section (10) and restrained gradually to outlet by import.
3. tandem blade Diffuser according to claim 1 is characterized in that, said blade (21) comprises first group of blade (211) and second group of blade (212).
4. tandem blade Diffuser according to claim 3 is characterized in that, the angle between said first group of blade (211) and said second group of blade (212) string of a musical instrument is 10 °~14 °.
5. tandem blade Diffuser according to claim 3; It is characterized in that; The exit port diameter ratio of said first group of blade (211) is 1.1~1.3; The exit port diameter ratio of said second group of blade (212) is 1.25~1.35, and said second group of blade (212) inlet diameter and said first group of blade (211) outlet diameter ratio are 0.9~1.1.
6. tandem blade Diffuser according to claim 1 is characterized in that, the inlet angle of every group of said blade (21) is 10 °~25 °, and exit angle is 25 °~35 °.
7. tandem blade Diffuser according to claim 1 is characterized in that, the number of blade of every group of said blade (21) is 7~13.
8. tandem blade Diffuser according to claim 1 is characterized in that, the blade chord length of every group of said blade (21) is less than 1.5 with the ratio of blade pitgh.
9. tandem blade Diffuser according to claim 8 is characterized in that, the blade chord length of said blade (21) 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 Go outBe blade exit diameter, D AdvanceBe blade inlet diameter, α AdvanceBe inlet blade angle, α Go outBe blade outlet angle.
10. tandem blade Diffuser according to claim 1 is characterized in that, said blade (21) adopts wing blades.
CN2012200477036U 2012-02-14 2012-02-14 Tandem vaned diffuser Withdrawn - After Issue CN202468473U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103244462A (en) * 2012-02-14 2013-08-14 珠海格力电器股份有限公司 Serial-type blade diffuser and production method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103244462A (en) * 2012-02-14 2013-08-14 珠海格力电器股份有限公司 Serial-type blade diffuser and production method thereof

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Granted publication date: 20121003

Effective date of abandoning: 20150819