CN103557166A - Multistage centrifugal compressor - Google Patents
Multistage centrifugal compressor Download PDFInfo
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- CN103557166A CN103557166A CN201310483210.6A CN201310483210A CN103557166A CN 103557166 A CN103557166 A CN 103557166A CN 201310483210 A CN201310483210 A CN 201310483210A CN 103557166 A CN103557166 A CN 103557166A
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Abstract
A multistage centrifugal compressor comprises a spindle, impellers, a spacer bush, a thrust disc, a balance disc, a diaphragm coupling, a curve, a backflow device, a diffuser, an inlet and outlet volute chamber and a seal and is characterized in that the compressor is provided with multiple cascade-stage impellers, vanes of the rear impeller of every two adjacent impellers deflects for certain angles relative to vanes of the front impeller of every two adjacent impellers; the diffuser adopts combination of a vaneless diffuser and a vane diffuser, the vaneless diffuser is in front of the vane diffuser; an air inlet way composed of an inner ring, an outer ring, a side plate and adjustable guide vanes is adopted; the inlet and outlet volute chamber provided with reinforcing ribs on two sides of a partition plate is adopted; an air seal body is sealed in a split mode and assembled integrally; an oil seal group structure provided with a certain-taper oblique plane on the inner wall of a seal ring is adopted. The multistage centrifugal compressor can stably work in a wide working range, can be well suitable for various different working environments and working media and wins consistent high praise from customers.
Description
Technical field
The invention belongs to the technical field of radial flow compressor, be specifically related to a kind of multistage gas compressor with same axis.
Background technique
In centrifugal compressor, critical piece is active wheel (impeller) and the Diffuser that matches with it, and air has very large kinetic energy from impeller flows out, and in order to effectively utilize this part energy, Diffuser is all housed after impeller.Diffuser can be divided into two kinds of vaneless diffuser and vane diffusers conventionally by its structure, and they have very large effect for the performance of improving compressor.
Although adopt the centrifugal compressed engine efficiency of vane diffuser higher, its operating range is narrower, because its final stage side can produce " the rotation separation of flow " phenomenon.Once there is the rotation separation of flow (being rotating stall), just can cause the play of compressor main shaft and shake, it is very difficult that drive compression machine will become, and this has just limited the operating range of compressor.
Vaneless diffuser also has rotation separation of flow phenomenon to occur, but by reducing the shaft orientation flowing channel height of Diffuser, the rotation separation of flow is avoidable.The runner height of Diffuser reduces, and its mean velocity raises, and the frictional loss meeting in Diffuser increases, and makes its Efficiency Decreasing.Like this, although vaneless diffuser efficiency is lower, it is better to adaptability for working condition, and, when impeller outlet absolute velocity reaches supersonic speed, as long as its radial velocity component is less than velocity of sound, in vaneless diffuser, still unshock produces, and now it can be reduced to subsonic flow by supersonic airstream.
How effectively to control the generation of multistage centrifugal compressor rotation separation of flow phenomenon, provide a kind of high-efficient compressor that can stabilized driving in wider operating range just to become the target that the art scientific and technical personnel pursue.
Chinese patent CN1015489B discloses a kind of < < multistage centrifugal compressor > >, it is characterized in that: each centrifugal rotor of compressor (being impeller) and the Diffuser that is attached thereto form one-level, compressor has at least four centrifugal rotors and at least four to lead vane type diffuser (being vane diffuser).The described stator leading-edge radius of leading previous Diffuser in vane type diffuser and the ratio of rotor outlet radius are greater than the same ratio of a rear Diffuser, and a rear Diffuser is from discharging close to the described previous Diffuser of side.Except having, lead vane type diffuser described at different levels, also have one-level at least without stator Diffuser.Due to the rotation separation of flow in Diffuser be reflux develop and be formed on Diffuser in the backflow of rotating with time generation, and lead vane type diffuser by starting to occur that the inner side at backflow position arranges stator leading edge without stator Diffuser, there is the effect of anti-backflow, so, backflow in Diffuser occurs suppressed at the beginning, also just avoided the generation of the rotation separation of flow, thereby can make compressor reach high efficiency, and can in relative broad range, work.
Chinese patent ZL92111548.2 discloses a kind of < < centrifugal compressor > >, it is characterized in that: the blade of vane diffuser is divided into two groups, first group of blade has along downstream direction tilt and depart from the leading edge that side plate extends towards central layer, second group of blade has the leading edge perpendicular to above-mentioned flow direction, and first group and second group of blade configure in the mode of mixing; Also be provided with a plurality of auxiliary blades, the chord length of each auxiliary blade is shorter than the chord length of each blade simultaneously; Auxiliary blade is configured on the radially inner position of blade, blade of one surface facing; Auxiliary blade is also divided into two groups, and first group has along downstream direction tilt and depart from the leading edge that above-mentioned side plate extends towards above-mentioned central layer; Second group of leading edge having perpendicular to above-mentioned flow direction, these two groups of auxiliary blades also configure with hybrid mode.Near the tongue of above-mentioned blade and auxiliary blade spiral type air-flow path, be sparse; And be intensive in the part away from above-mentioned tongue of above-mentioned passage; And tongue near be one and comprise above-mentioned tongue and corresponding to being not more than half region of whole circumference.The position of this design leading edge more approaches impeller, can reduce as far as possible or prevent adverse current, thereby even also can prevent surge in low airspeed interval.Blade inhomogeneous configuration together with auxiliary blade forms a rarefaction and a compact district, also can reduce as much as possible the generation of rotating stall.
Chinese invention patent application case CN102434491A discloses a kind of < < centrifugal compressor > >, the stator of described vane diffuser is comprised of trailing edge radius long and short stator identical and that length is different, between adjacent long stator, at least configure a slice short-range missile leaf, utilize the rectified action of short-range missile leaf, improve the performance of compressor.
The starting point of above-mentioned all inventions all focuses on Diffuser, yet, even more important parts or its active wheel (impeller) in centrifugal compressor, in the sense, impeller and Diffuser are the main bodys of the conflict that cooperatively interacts, improve the performance of compressor, should synthetically consider their structure and interrelated.This is the starting point of our research work just.
Summary of the invention
Object of the present invention is exactly to find a kind of high-efficiency multi-stage centrifugal compressor that can stabilized driving in wider operating range.We are mobile the starting with impeller from learning gas, when the limited number of blade, impact due to circulation movement in blade path, in the outlet port of impeller, exist a velocity of circulation contrary with peripheral speed (being axial whirlpool), the relative velocity that makes air-flow in outlet port towards despining direction deflection one angle.If between two adjacent blades, the blade setting of a rear impeller is with respect to the blade of the previous impeller also corresponding angle of deflection, just can reduce significantly the existence in axial whirlpool.Improved accordingly the design to Diffuser.In order to guarantee the Uniform Flow of air-flow in volute casing runner, we have not only considered the design of improvement radial inlet guide vane adjuster, have also studied the structure of importing and exporting volute casing simultaneously.
The invention provides a kind of multistage centrifugal compressor, it mainly includes: main shaft, impeller, spacer, thrust disc, Balance disc, diaphragm coupling, bend, return channel, Diffuser, import and export volute casing, sealing, is characterized in that:
(1) adopt a plurality of tandem impellers, between two adjacent impellers, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller;
(2) Diffuser adopts the combination of vaneless diffuser and vane diffuser, vaneless diffuser at front and vane diffuser rear;
(3) adopt the adjustable intake duct of stator angle being formed by interior ring, outer shroud, side plate and stator;
(4) adopt the import and export volute casing of dividing plate both sides band stiffening rib;
(5) air sealing of the overall assembling of split sealing;
(6) adopt seal ring inwall with the oil seal group structure on the inclined-plane of certain taper.
Multistage centrifugal compressor of the present invention, said between two adjacent impellers of impeller, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller; For backward leaning vane, be: 5～15 degree; For forward curved vane, be: 5～15 degree; For radial blade, be: 5～30 degree.
Multistage centrifugal compressor of the present invention, the adjustable intake duct of said employing stator angle, is separately equipped with guide positioning pin, changes locating stud and the stator rotating center pin of stator angle.
Multistage centrifugal compressor of the present invention, the import and export volute casing of said outlet partition plate both sides band stiffening rib is to be spliced by upper and lower two-part, is respectively equipped with helical line type volute casing runner on dividing plate biside plate face, is distributed with reinforcement gusset between biside plate face; On split between dividing plate top and the bottom, be also provided with ring stiffener.
Multistage centrifugal compressor of the present invention, the air sealing of the overall assembling of said split sealing, comprise upper-lower seal body, on it, in seal body, be designed with sealing tooth and Seal cage, and with seal ring by with lower seal body on the close fit of fine thread upper-lower seal body is tightened up.
Multistage centrifugal compressor of the present invention, said employing seal ring inwall is with the oil seal group structure on the inclined-plane of certain taper, its sealing surface is to be positioned at seal ring inwall and with the inclined-plane of tapering, to have the decorative pattern of flexuose or convex-concave shape on surface, on it and be provided with babbit layer.
The present invention is combined invention, combines the multinomial utility model patent of our company, separately adds the innovative design of inventor to impeller and Diffuser, not only can make this multistage centrifugal compressor in wider operating range, stably to drive; And can make compressor can be suitable for better various working environment and working medium, be subject to user's consistent favorable comment; Obtain users' welcome.
Accompanying drawing explanation
Fig. 1 is the whole generalized section of multistage centrifugal compressor of the present invention; Fig. 2 is the plan view of the adjustable intake duct of stator angle; Fig. 3 and Fig. 4 are respectively the structural representations of the import and export volute casing bi-side of outlet partition plate both sides band stiffening rib; Fig. 5 is the plan view of the air sealing of the overall assembling of split sealing; Fig. 6 is the structural representation of oil seal group structure.
Embodiment
Below in conjunction with accompanying drawing, multistage centrifugal compressor of the present invention is further described and is supplemented.
As shown in Figure 1, multistage centrifugal compressor of the present invention comprises main shaft 1, impeller 2, spacer 3, thrust disc 4, intake duct 5, imports and exports volute casing 6, diaphragm coupling 7, bend 8, Diffuser 9, return channel 10, Balance disc 11, air sealing 12, oil sealing group 13, its impeller has two at least, they are serially connected on main shaft, between two adjacent blades 21, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller; For backward leaning vane, be: 5～15 degree; For forward curved vane, be: 5～15 degree; For radial blade, be: 5～30 degree.The Diffuser of multistage centrifugal compressor of the present invention is divided into two groups, and one group is vaneless diffuser 91; Another group is the configuration of 92, two groups of compartment of terrains of vane diffuser, configures a vane diffuser after each vaneless diffuser.
As shown in Figure 2, multistage centrifugal compressor of the present invention adopts the adjustable intake duct of stator angle, and it comprises side plate 51, interior ring 52, outer shroud 53, stator 54, stator locating stud 55, changes stator angular positioning pin 56 and stator rotating center pin 57..Outer shroud is fixed on interior ring by guide positioning pin, change stator angular positioning pin and insert outer shroud, stator rotating center pin inserts on interior ring and side plate, stator is slidably connected with change angular positioning pin, by outer shroud, drive and change stator angular positioning pin, change stator angular positioning pin and drive again stator to rotate around stator rotating center pin, thus the angle of adjustable intake duct stator.
As shown in Figure 3 and Figure 4, the present invention adopts the import and export volute casing of outlet partition plate both sides band stiffening rib, be intermediate clapboard turnover air chamber structure, it comprises: on dividing plate, import and export and under volute casing 61, dividing plate, import and export volute casing 62, strengthen gusset 63, split annular muscle 64, runner 65, volute casing outlet 66..First with steel, make upper and lower import and export volute casing respectively, with steel, suppress respectively and be processed into again reinforcement gusset and split annular muscle, finally adopt welding procedure, with strengthening the annular muscle of gusset and split, upper and lower import and export volute casing is welded into one respectively, is finally made into the import and export volute casing of outlet partition plate both sides band stiffening rib.
As shown in Figure 5, air sealing of the present invention is by seal body top | 121 and seal body bottom 122 form, seal body top is divided into sealing tooth 124 and Seal cage 126, closely-pitched spiral 125 is arranged at seal body bottom, by sealing the cooperation of retaining ring 123 and closely-pitched spiral, the upper and lower two-part of seal body is tightened up.
As shown in Figure 6, oil sealing group of the present invention comprises body 131 and babbit layer 132, and the sealing surface indention of its body or the pitted skin of convex-concave shape are positioned at seal ring inwall and with certain taper.During making, first with the oil sealing group body of zigzag fashion or convex-concave shape sealing surface, then at sealing surface upper Babbitt, finally inside and outside ring is assembled into one and makes oil sealing group.
We are further described the parameter of multistage centrifugal compressor of the present invention by specific embodiment below.
The present embodiment is three grades of centrifugal compressors, and impeller adopts unshrouded impeller, and its blade adopts back curved structure, deflection 5 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, and vane diffuser is configured in high pressure stage one side.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is Pyatyi centrifugal compressor, and impeller adopts half-opened impeller, and its blade adopts back curved structure, deflection 15 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, configures vane diffuser after each vaneless diffuser.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is level Four centrifugal compressor, and impeller adopts double shrouded wheel, and its blade adopts back curved structure, deflection 10 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, configures vane diffuser after each vaneless diffuser.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is three grades of centrifugal compressors, and impeller adopts unshrouded impeller, and its blade adopts antecurvature formula structure, deflection 5 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, and vane diffuser is configured in high pressure stage one side.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is Pyatyi centrifugal compressor, and impeller adopts half-opened impeller, and its blade adopts antecurvature formula structure, deflection 15 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, configures vane diffuser after each vaneless diffuser.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is level Four centrifugal compressor, and impeller adopts double shrouded wheel, and its blade adopts antecurvature formula structure, deflection 10 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, configures vane diffuser after each vaneless diffuser.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is six grades of centrifugal compressors, and impeller adopts unshrouded impeller, and its blade adopts radial structure, deflection 5 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, and vane diffuser is configured in high pressure stage one side.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is Pyatyi centrifugal compressor, and impeller adopts half-opened impeller, and its blade adopts radial structure, deflection 15 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, configures vane diffuser after each vaneless diffuser.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The present embodiment is level Four centrifugal compressor, and impeller adopts double shrouded wheel, and its blade adopts radial structure, deflection 10 degree between the blade of front and back two impellers; Vaneless diffuser is configured in low pressure stage side, configures vane diffuser after each vaneless diffuser.Import and export volute casing, air sealing and the oil seal group structure of the import and export volute casing of the intake duct that remaining stator angle is adjustable, outlet partition plate both sides band stiffening rib, outlet partition plate both sides band stiffening rib all as previously mentioned, without separately adding explanation.
The various embodiments described above are only the design proposals proposing according to the different service conditions of different user, these schemes are signed after corresponding Non Disclosure Agreement same user, model machine is offered to user's special case that obtains comparatively satisfied effect on probation, therefore can also can also list more embodiments.
The present invention is a kind of component invention, it is being studied emphatically under the condition of limited blade, the impact of circulation on outlet velocity, and on this basis, structure for combination, intake duct, import and export volute casing and the oil sealing group of Diffuser has been carried out corresponding improvement, has finally formed the combination of invention.It is characterized in that it is suitable for the air-flow of various flowing mediums and different pressures, thereby go for various specialties and engineering, obtain the extensive welcome of each all kinds of enterprises of row, obtained good Social benefit and economic benefit.
Claims (8)
1. a multistage centrifugal compressor, it comprises: main shaft, impeller, spacer, thrust disc, Balance disc, diaphragm coupling, bend, return channel, Diffuser, import and export volute casing, sealing, is characterized in that:
(1) adopt a plurality of tandem impellers, between two adjacent impellers, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller;
(2) Diffuser adopts the combination of vaneless diffuser and vane diffuser, vaneless diffuser at front and vane diffuser rear;
(3) adopt the adjustable intake duct of stator angle being formed by interior ring, outer shroud, side plate and stator;
(4) adopt the import and export volute casing of dividing plate both sides band stiffening rib;
(5) air sealing of the overall assembling of split sealing;
(6) adopt seal ring inwall with the oil seal group structure on the inclined-plane of certain taper.
2. by multistage centrifugal compressor claimed in claim 1, it is characterized in that saidly between two adjacent impellers of impeller, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller, for backward leaning vane is: 5～15 degree.
3. by multistage centrifugal compressor claimed in claim 1, it is characterized in that said between two adjacent impellers of impeller, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller; For for forward curved vane being: 5～15 degree.
4. by multistage centrifugal compressor claimed in claim 1, it is characterized in that said between two adjacent blades of impeller, the blade setting angle certain with respect to the blade deflection of previous impeller of a rear impeller; For for radial blade being: 5～30 degree.
5. by multistage centrifugal compressor claimed in claim 1, it is characterized in that the adjustable intake duct of said stator angle is separately equipped with locating stud and the stator rotating center pin of guide positioning pin, change stator angle.
6. by multistage centrifugal compressor claimed in claim 1, the import and export volute casing that it is characterized in that said outlet partition plate both sides band stiffening rib is to be spliced by upper and lower two-part, on dividing plate biside plate face, be respectively equipped with helical line type volute casing runner, between biside plate face, be distributed with reinforcement gusset; On split between dividing plate top and the bottom, be also provided with ring stiffener.
7. by multistage centrifugal compressor claimed in claim 1, the air sealing that it is characterized in that the overall assembling of said split sealing, comprise upper-lower seal body, on it, in seal body, be designed with sealing tooth and Seal cage, and upper-lower seal body tightened up by the fine thread on same lower seal body with seal ring.
8. by multistage centrifugal compressor claimed in claim 1, it is characterized in that said employing seal ring inwall is with the oil seal group structure on the inclined-plane of certain taper, its sealing surface is to be positioned at seal ring inwall and with the inclined-plane of tapering, the decorative pattern that has flexuose or convex-concave shape on surface, on it and be provided with babbit layer.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103807209A (en) * | 2014-02-13 | 2014-05-21 | 沈阳斯特机械制造有限公司 | Enclosed impeller of centrifugal compressor |
| CN104121202A (en) * | 2014-07-24 | 2014-10-29 | 浙江科尔泵业股份有限公司 | Steady type high-rotation-speed centrifugal water injection pump |
| CN104632645A (en) * | 2014-11-06 | 2015-05-20 | 沈阳斯特机械制造有限公司 | Double inlet multistage centrifugal compressor |
| CN105201872A (en) * | 2015-09-28 | 2015-12-30 | 沈阳斯特机械制造有限公司 | Vertically-dismounted multi-stage centrifugal compressor |
| CN105275834A (en) * | 2015-10-27 | 2016-01-27 | 上海华鼓鼓风机有限公司 | Three-dimensional flow centrifugal blower with low-speed multistage vertical split cylinder structure |
| CN106050691A (en) * | 2016-05-24 | 2016-10-26 | 湖北省风机厂有限公司 | Multi-stage centrifugal blower |
| CN106635151A (en) * | 2017-02-15 | 2017-05-10 | 沈阳斯特机械制造有限公司 | Combined centrifugal compressor for continuous catalytic reforming units |
| CN109681471A (en) * | 2019-02-14 | 2019-04-26 | 福建雪人股份有限公司 | A kind of distance member for multistage centrifugal compressor |
| CN112253491A (en) * | 2020-09-03 | 2021-01-22 | 上海发电设备成套设计研究院有限责任公司 | Multistage centrifugal supercritical carbon dioxide compressor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103807209A (en) * | 2014-02-13 | 2014-05-21 | 沈阳斯特机械制造有限公司 | Enclosed impeller of centrifugal compressor |
| CN104121202A (en) * | 2014-07-24 | 2014-10-29 | 浙江科尔泵业股份有限公司 | Steady type high-rotation-speed centrifugal water injection pump |
| CN104121202B (en) * | 2014-07-24 | 2017-08-25 | 浙江科尔泵业股份有限公司 | The high rotating speed centrifugal water-injection pump of steady formula |
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| CN105275834A (en) * | 2015-10-27 | 2016-01-27 | 上海华鼓鼓风机有限公司 | Three-dimensional flow centrifugal blower with low-speed multistage vertical split cylinder structure |
| CN106050691A (en) * | 2016-05-24 | 2016-10-26 | 湖北省风机厂有限公司 | Multi-stage centrifugal blower |
| CN106635151A (en) * | 2017-02-15 | 2017-05-10 | 沈阳斯特机械制造有限公司 | Combined centrifugal compressor for continuous catalytic reforming units |
| CN109681471A (en) * | 2019-02-14 | 2019-04-26 | 福建雪人股份有限公司 | A kind of distance member for multistage centrifugal compressor |
| CN109681471B (en) * | 2019-02-14 | 2023-08-29 | 福建雪人股份有限公司 | Spacing assembly for multistage centrifugal compressor |
| CN112253491A (en) * | 2020-09-03 | 2021-01-22 | 上海发电设备成套设计研究院有限责任公司 | Multistage centrifugal supercritical carbon dioxide compressor |
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| CN103557166B (en) | 2016-06-08 |
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