CN111396328A - A high-efficient centrifugal compressor arrangement for inert mixed working medium - Google Patents
A high-efficient centrifugal compressor arrangement for inert mixed working medium Download PDFInfo
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- 230000004323 axial length Effects 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 3
- 239000012530 fluid Substances 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 13
- 238000007906 compression Methods 0.000 abstract description 13
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000010146 3D printing Methods 0.000 abstract description 3
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000003801 milling Methods 0.000 abstract description 3
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 3
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/266—Rotors specially for elastic fluids mounting compressor rotors on shafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/288—Part of the wheel having an ejecting effect, e.g. being bladeless diffuser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of centrifugal compressors, and particularly relates to a high-efficiency centrifugal compression device for inert mixed working media, which comprises: a centrifugal impeller, a diffuser and a compressor volute; the centrifugal impeller and the compressor volute are made of titanium alloy materials, the centrifugal impeller is of an integral structure, namely, a blade and a wheel disc are integrated, and the centrifugal impeller is formed by adopting a machining and numerical control milling mode; the compressor volute is formed by adopting a 3D printing technology. The diffuser is made of stainless steel material; the centrifugal impeller is provided with a central hole for installing the mandrel, is connected with the mandrel through a mandrel nut and can rotate at a high speed under the driving of the mandrel; the excircle of the central shaft of the centrifugal impeller is in interference fit with the shaft coupler, and can drive the shaft coupler and a motor connected with the shaft coupler to rotate to generate power; the compression device is simple in structure, excellent in performance and low in cost, and meets application requirements in a closed cycle power generation system.
Description
Technical Field
The invention belongs to the technical field of centrifugal compressors, and particularly relates to a high-efficiency centrifugal compression device for inert mixed working media.
Background
The centrifugal compressor has the characteristics of high single-stage supercharging ratio, simple structure, less parts, small axial size, wide stable working range and the like, and is widely applied.
Because of the closed characteristic of the closed cycle power generation system, the internal working medium not only requires stable property, but also requires good heat exchange capacity, small flow loss and the like, and is easy to compress and expand to perform heat-power conversion, helium is generally used as a compression working medium in the closed system, but the helium is difficult to compress, and therefore an inert mixed working medium is used. The special physical properties of the inert mixed working medium make the flow easier to separate. Conventional compression devices, such as axial flow compressors, have a low single stage pressure ratio and require more stages to achieve the same pressure ratio. The increase of the number of stages causes the number of parts to be increased, the axial size to be enlarged, the structure to be complicated and the stable working range to be reduced. And if the compressor cannot be designed according to the special physical parameters of the inert mixed working medium, the efficiency of the compression system is lower.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: the defects of the axial flow compressor in engineering application are overcome.
(II) technical scheme
In order to solve the technical problem, the invention provides a high-efficiency centrifugal compression device for inert mixed working media, which comprises: a centrifugal impeller 3, a diffuser 5 and a compressor volute 4;
the center of the centrifugal impeller 3 is provided with a through hole, the mandrel 7 penetrates out of the through hole, the centrifugal impeller 3 is connected with the mandrel 7 through the mandrel nut 2, and the centrifugal impeller 3 can rotate at a high speed under the driving of the mandrel 7;
the main shaft is inserted from the right end of the centrifugal impeller 3 and is in interference fit with the excircle at the right end of the centrifugal impeller 3, so that a rigid rotor is formed;
the outer circle of the left end of the centrifugal impeller 3 is inserted into the cavity of the annular structure of the right end of the coupler 1, and the centrifugal impeller 3 is in interference fit with the coupler 1 and can drive the coupler 1 and a motor connected with the coupler 1 to rotate to generate power;
the outer circle of the left end of the diffuser 5 is inserted into the inner hole of the right end of the compressor volute 4 to realize positioning; the outer circle of the right end of the diffuser 5 is inserted into the inner hole of the left side of the intermediary casing 8, and the compressor volute 4 and the diffuser 5 are connected with the intermediary casing 8 through the screws 6 arranged on the edges;
a certain gap is formed between the inner wall surface of the compressor volute 4 and the blade top molded surface of the centrifugal impeller 3.
The centrifugal impeller 3 comprises 12 blades which are uniformly distributed in the circumferential direction, and the molded surfaces of the blades are ruled surfaces.
Wherein the clearance between the inner wall surface of the compressor volute 4 and the blade profile of the centrifugal impeller 3 is 0.35-0.45 mm.
The centrifugal impeller 3, the diffuser 5 and the compressor volute 4 jointly form an air flow channel.
Wherein the diffuser 5 is a vaneless diffuser.
The high-efficiency centrifugal compression device is provided with a flow channel molded surface of the compressor volute 4 and a flow channel molded surface and a blade molded surface of the centrifugal impeller 3 according to the characteristics of an inert mixed working medium, airflow axially enters from the left side of the centrifugal impeller 3, the airflow is rotated and pressurized through the centrifugal impeller 3 at the rotating speed of 50000 r/min-100000 r/min, and the airflow flowing out of the centrifugal impeller 3 enters the diffuser 5 and the compressor volute 4 to be further decelerated and pressurized.
Wherein, set up airflow channel and centrifugal impeller blade profile according to inert mixed working medium rerum natura:
definition D3Is the diameter of the outlet of the diffuser 5, D2In order to obtain the diameter of the outlet of the centrifugal impeller 3,D1tis the diameter of the rim of the centrifugal impeller 3, D1hIs the diameter of the inlet hub of the centrifugal impeller 3, b2Is the outlet width of the centrifugal impeller 3, and L is the axial length of the centrifugal impeller 3;
wherein,
l selecting 25mm, the flow channel profile curve is generated by spline points.
Wherein,
wherein,
wherein,
(III) advantageous effects
Compared with the prior art, the centrifugal compressor designed by adopting the special physical property change rule and the flow rule of the inert mixed working medium is simple in structure, excellent in performance and low in cost, and meets the application requirement in a closed cycle power generation system.
Drawings
Fig. 1 is a schematic view of the overall structure of a centrifugal compressor provided by the invention.
In the figure, 1, a coupling; 2. a spindle nut; 3. a centrifugal impeller; 4. a compressor volute;
5. a diffuser; 6. a screw; 7. a mandrel; 8. an intermediary case; 9. a pressure disc.
Fig. 2 is a schematic view of the airflow channel provided by the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the problems of the prior art, the present invention provides a high-efficiency centrifugal compression device for inert mixed working media, as shown in fig. 1, the high-efficiency centrifugal compression device comprises: a centrifugal impeller 3, a diffuser 5 and a compressor volute 4;
the center of the centrifugal impeller 3 is provided with a through hole, the mandrel 7 penetrates out of the through hole, the centrifugal impeller 3 is connected with the mandrel 7 through the mandrel nut 2, and the centrifugal impeller 3 can rotate at a high speed under the driving of the mandrel 7;
the main shaft is inserted from the right end of the centrifugal impeller 3 and is in interference fit with the excircle at the right end of the centrifugal impeller 3, so that a rigid rotor is formed;
the outer circle of the left end of the centrifugal impeller 3 is inserted into the cavity of the annular structure of the right end of the coupler 1, and the centrifugal impeller 3 is in interference fit with the coupler 1 and can drive the coupler 1 and a motor connected with the coupler 1 to rotate to generate power;
the outer circle of the left end of the diffuser 5 is inserted into the inner hole of the right end of the compressor volute 4 to realize positioning; the outer circle of the right end of the diffuser 5 is inserted into the inner hole of the left side of the intermediary casing 8, and the compressor volute 4 and the diffuser 5 are connected with the intermediary casing 8 through the screws 6 arranged on the edges;
a certain gap is reserved between the inner wall surface of the compressor volute 4 and the blade profile of the centrifugal impeller 3.
The centrifugal impeller 3 comprises 12 blades which are uniformly distributed in the circumferential direction, and the molded surfaces of the blades are ruled surfaces.
Wherein the clearance between the inner wall surface of the compressor volute 4 and the blade profile of the centrifugal impeller 3 is 0.35-0.45 mm.
The centrifugal impeller 3, the diffuser 5 and the compressor volute 4 jointly form an air flow channel, as shown in fig. 2.
Wherein the diffuser 5 is a vaneless diffuser.
The high-efficiency centrifugal compression device is provided with a flow channel molded surface of the compressor volute 4 and a flow channel molded surface and a blade profile of the centrifugal impeller 3 according to the characteristics of an inert mixed working medium, airflow axially enters from the left side of the centrifugal impeller 3, the compressed working medium is the inert mixed working medium, the compressed working medium is rotated and pressurized by the centrifugal impeller 3 at the rotating speed of 50000 r/min-100000 r/min, and the gas flowing out of the centrifugal impeller 3 enters the diffuser 5 and the compressor volute 4 to be further decelerated and pressurized.
Wherein, set up airflow channel and centrifugal impeller blade profile according to inert mixed working medium rerum natura:
definition D3Is the diameter of the outlet of the diffuser 5, D2Is the diameter of the outlet of the centrifugal impeller 3, D1tIs the diameter of the rim of the centrifugal impeller 3, D1hIs the diameter of the inlet hub of the centrifugal impeller 3, b2Is the outlet width of the centrifugal impeller 3, and L is the axial length of the centrifugal impeller 3;
wherein,
l, selecting 25mm, generating a runner profile curve through spline points, realizing the compressor flow of 1.2Kg/s, the whole-stage pressure ratio of 2.5 and the heat insulation efficiency of more than 80% by the design, solving the problems of difficult compression, large separation and low efficiency of inert mixed working media.
The centrifugal impeller 3 and the compressor volute 4 are made of titanium alloy materials, and the diffuser 5 is made of stainless steel materials.
The centrifugal impeller 3 is of an integral structure, namely, the blades and the wheel disc are integrated, and the centrifugal impeller is formed by adopting a machining mode and a numerical control milling mode.
The compressor volute 4 is formed by adopting a 3D printing technology.
Example 1
The embodiment provides a centrifugal compressor, wherein a compression working medium is an inert mixed working medium, the rotating speed of the compressor is 50000 r/min-100000 r/min, the flow rate is 1.2Kg/s, the whole-stage pressure ratio is 2.5, and the efficiency is more than 80%; the device comprises a centrifugal impeller, a diffuser and a compressor volute; the centrifugal impeller and the compressor volute are made of titanium alloy materials, the centrifugal impeller is of an integral structure, namely, a blade and a wheel disc are integrated, and the centrifugal impeller is formed by adopting a machining and numerical control milling mode; the compressor volute is formed by adopting a 3D printing technology. The diffuser is made of stainless steel material; the centrifugal impeller is provided with a central hole for installing the mandrel, is connected with the mandrel through a mandrel nut and can rotate at a high speed under the driving of the mandrel; the excircle of the central shaft of the centrifugal impeller is in interference fit with the shaft coupler, and can drive the shaft coupler and a motor connected with the shaft coupler to rotate to generate power; the centrifugal impeller adopts a form that 12 blades are uniformly distributed in the circumferential direction, and the molded surfaces of the blades are all ruled surfaces. A certain gap is formed between the matching molded surface of the compressor volute and the centrifugal impeller and the blade top molded surface of the centrifugal impeller; the compressor volute bolt is connected with the diffuser. The diffuser is a vaneless diffuser.
Wherein, the compressed working medium of the air compressing device is inert mixed working medium.
Wherein, the rotating speed of the air compressor is 50000 r/min-100000 r/min, the flow of the air compressor is 1.2Kg/s, the whole-stage pressure ratio is 2.5, and the efficiency is more than 80%.
Wherein, the blade profile of centrifugal impeller is the ruled surface, 12 blade circumference equipartitions.
Wherein, the excircle of the central shaft of the centrifugal impeller is in interference fit with the shaft coupler, and can drive the shaft coupler and a motor connected with the shaft coupler to rotate for power generation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A high efficiency centrifugal compressor apparatus for an inert mixed working fluid, said high efficiency centrifugal compressor apparatus comprising: the centrifugal impeller (3), the diffuser (5) and the compressor volute (4);
the center of the centrifugal impeller (3) is provided with a through hole, the mandrel (7) penetrates out of the through hole, the centrifugal impeller (3) is connected with the mandrel (7) through the mandrel nut (2), and the centrifugal impeller (3) can be driven by the mandrel (7) to rotate at a high speed;
the main shaft is inserted from the right end of the centrifugal impeller (3) and is in interference fit with the excircle at the right end of the centrifugal impeller (3), so that a rigid rotor is formed;
the outer circle of the left end of the centrifugal impeller (3) is inserted into a cavity of an annular structure at the right end of the coupler (1), and the centrifugal impeller (3) and the coupler (1) are in interference fit, so that the coupler (1) and a motor connected with the coupler (1) can be driven to rotate to generate power;
the excircle at the left end of the diffuser (5) is inserted into the inner hole at the right end of the compressor volute (4) to realize positioning; the outer circle of the right end of the diffuser (5) is inserted into the inner hole of the left side of the intermediary casing (8), and the compressor volute (4) and the diffuser (5) are connected with the intermediary casing (8) through screws (6) arranged on the edges;
a certain gap is formed between the inner wall surface of the compressor volute (4) and the blade top profile of the centrifugal impeller (3).
2. The efficient centrifugal compressor for inert mixed working media according to claim 1, characterized in that the centrifugal impeller (3) comprises 12 blades which are circumferentially and uniformly distributed, and the blade profiles are ruled surfaces.
3. The efficient centrifugal compressor for inert mixed working media according to claim 1, wherein the clearance between the inner wall surface of the compressor volute (4) and the blade profile of the centrifugal impeller (3) is in the range of 0.35-0.45 mm.
4. The high-efficiency centrifugal compressor for inert mixed working media according to claim 1, characterized in that the centrifugal impeller (3), the diffuser (5) and the compressor volute (4) jointly form an air flow channel.
5. A high efficiency centrifugal compressor device for inert mixed media according to claim 1 wherein the diffuser (5) is a vaneless diffuser.
6. The efficient centrifugal compressor for inert mixed working media according to claim 1, wherein the efficient centrifugal compressor is provided with a flow channel profile of the compressor volute (4) and a flow channel profile and a blade profile of the centrifugal impeller (3) according to the characteristics of the inert mixed working media, the gas flow axially enters from the left side of the centrifugal impeller (3), the gas flow is rotated and pressurized by the centrifugal impeller (3), the rotating speed is 50000 rpm-100000 r/min, and the gas flowing out of the centrifugal impeller (3) enters the diffuser (5) and the compressor volute (4) for further speed reduction and pressurization.
7. The efficient centrifugal compressor for inert mixed working media according to claim 1, wherein the airflow channel and the centrifugal impeller blade profile are arranged according to physical properties of the inert mixed working media:
definition D3Is the diameter of the outlet of the diffuser (5), D2Is the outlet diameter of the centrifugal impeller (3), D1tIs a centrifugalDiameter of rim of impeller (3), D1hIs the diameter of the inlet hub of the centrifugal impeller (3), b2Is the outlet width of the centrifugal impeller (3), and L is the axial length of the centrifugal impeller (3);
wherein,
l selecting 25mm, the flow channel profile curve is generated by spline points.
8. The high efficiency centrifugal compressor for inert working mixture according to claim 7,
9. The inert working mixture high-efficiency centrifugal compressor device as claimed in claim 8,
10. The high efficiency centrifugal compressor for inert working mixture according to claim 9,
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111396329A (en) * | 2020-04-30 | 2020-07-10 | 北京动力机械研究所 | High-efficient centrifugal compressor arrangement suitable for inert mixed working medium |
| CN114810668A (en) * | 2022-03-17 | 2022-07-29 | 哈尔滨工业大学 | Turbine and breathing machine |
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| CN111396329A (en) * | 2020-04-30 | 2020-07-10 | 北京动力机械研究所 | High-efficient centrifugal compressor arrangement suitable for inert mixed working medium |
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| CN114810668A (en) * | 2022-03-17 | 2022-07-29 | 哈尔滨工业大学 | Turbine and breathing machine |
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