CN219826932U - Air inlet volute and expander - Google Patents
Air inlet volute and expander Download PDFInfo
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- CN219826932U CN219826932U CN202321105021.0U CN202321105021U CN219826932U CN 219826932 U CN219826932 U CN 219826932U CN 202321105021 U CN202321105021 U CN 202321105021U CN 219826932 U CN219826932 U CN 219826932U
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- 238000005259 measurement Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
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- 239000008358 core component Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000009835 boiling Methods 0.000 description 1
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- 238000001816 cooling Methods 0.000 description 1
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Abstract
The utility model provides an air intake volute and an expander, wherein the air intake volute comprises a contracted air intake pipeline and a variable-section cylinder, a variable-section spiral air intake channel is arranged in the variable-section cylinder, and the inner surface of the contracted end of the contracted air intake pipeline is in smooth transition connection with the surface of an air intake port of the variable-section spiral air intake channel. The air inlet volute provided by the utility model has the advantages of simple structure, convenience in measurement, low manufacturing cost, specific good pneumatic performance and capability of meeting the requirement of the installation of the expander to the greatest extent.
Description
Technical Field
The utility model relates to the technical field of expanders, in particular to an air inlet volute and an expander.
Background
The organic Rankine cycle (English full name: organic Rankine cycle, abbreviated as ORC) is a Rankine cycle taking low-boiling point organic matters as working media, can recycle medium-temperature heat sources, and has good development prospect under the large situation of shortage of global fossil energy. The main components of the organic Rankine cycle system comprise a waste heat boiler, a turbine expander, a condenser and a working medium pump, wherein the turbine expander is a core component of the organic Rankine cycle system. The centripetal turbine expander is used as one of the turbine expanders, has the characteristics of high single-stage pressure ratio, high efficiency at low flow, compact structure, simple manufacture, low cost, high strength reliability and vibration reliability and the like, and is the optimal choice of more than 100KW of power in an ORC system.
The centripetal turbine through-flow structure is a core component of the centripetal turbine expander, which affects the performance of the centripetal turbine expander. Centripetal turbine flow structures generally include an inlet volute, vanes, and buckets. Currently, research into performance improvement of radial inflow turboexpanders is mainly directed to improving guide vanes and blades. However, with the continuous perfection of the design means and processing methods of the guide vanes and the moving blades, it is more and more difficult to improve the performance of the radial inflow turbine expander by improving the guide vanes and the moving blades, so improving the performance of the air inlet structure has become a key for further improving the performance of the whole machine.
For the inlet volute of the centripetal turbine expander, the type of the inlet volute not only affects the flow and the loss in the inlet structure, but also affects the flow and the loss of downstream components such as guide vanes, moving blades and the like, so that the functions of the inlet volute, the guide vanes and the moving blades are mutually realized. The snail-type air intake volute shown in fig. 1 has a relatively complex processing technology, resulting in high manufacturing cost. The cylindrical air inlet volute shown in fig. 2 has a simple structure, but has lower performance, and cannot meet the production requirement.
Disclosure of Invention
The utility model provides an air inlet volute and an expander, which are used for solving the problems of complex processing technology and low performance of the existing air inlet volute.
The utility model provides an air inlet volute chamber which comprises a contracted air inlet pipeline and a variable-section cylinder body, wherein a variable-section spiral air inlet channel is arranged in the variable-section cylinder body, and the inner surface of the contracted end of the contracted air inlet pipeline is in smooth transition connection with the surface of an air inlet port of the variable-section spiral air inlet channel.
Preferably, the variable-section spiral air inlet channel is a symmetrical variable-section spiral air inlet channel with the contracted air inlet pipeline as the center.
Preferably, the included angle theta between the normal line and the central line at any section position of the variable-section spiral air inlet channel is transited from 0 degree to 180 degrees.
Preferably, the expansion end section of the contracted air inlet pipeline is a circular section, and the contraction end section is an elliptical section.
The utility model provides an expander, which comprises an air inlet volute, a nozzle, an impeller and a diffuser pipe, wherein an air outlet port of a variable-section spiral air inlet channel in the air inlet volute is communicated with an air inlet end of the nozzle, the air outlet end of the nozzle is communicated with the impeller, and the diffuser pipe is arranged on the periphery of the impeller.
The technical scheme provided by the embodiment of the utility model can comprise the following beneficial effects:
the utility model provides an air intake volute and an expander, wherein the air intake volute comprises a contracted air intake pipeline and a variable-section cylinder, a variable-section spiral air intake channel is arranged in the variable-section cylinder, and the inner surface of the contracted end of the contracted air intake pipeline is in smooth transition connection with the surface of an air intake port of the variable-section spiral air intake channel. The air inlet volute provided by the utility model has the advantages of simple structure, convenience in measurement, low manufacturing cost, specific good pneumatic performance and capability of meeting the requirement of the installation of the expander to the greatest extent.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.
Drawings
In order to more clearly illustrate the technical solution of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of a conventional snail-type air intake volute;
FIG. 2 is a schematic diagram of a conventional cylindrical intake volute;
FIG. 3 is a front view of an intake volute provided in an embodiment of the present utility model;
FIG. 4 is a left side view of an intake volute provided in accordance with an embodiment of the present utility model;
fig. 5 is a schematic line structure diagram of an air intake volute according to an embodiment of the present utility model;
FIG. 6 is a graph showing the relative efficiency-expansion ratio of an air intake volute and a cylindrical air intake volute according to an embodiment of the present utility model;
FIG. 7 is a graph showing the relative flow-expansion ratio between the air intake scroll and the cylindrical air intake scroll according to an embodiment of the present utility model;
fig. 8 is a schematic perspective view of an expander according to an embodiment of the present utility model;
FIG. 9 is a schematic diagram of the flow of gas in an expander according to an embodiment of the present utility model;
the symbols represent:
1-a contracted air inlet pipeline, 2-a variable cross section cylinder body and 3-a variable cross section spiral air inlet channel;
01-air inlet volute, 02-nozzle, 03-impeller and 04-diffuser.
Detailed Description
Referring to fig. 3 and 4, fig. 3 and 4 show a front view and a left view of an air intake volute provided by an embodiment of the present utility model, respectively. As can be seen from fig. 3 and 4, the air intake volute provided by the embodiment of the utility model comprises a contracted air intake pipeline 1 and a variable-section cylinder 2, wherein a variable-section spiral air intake channel 3 is arranged inside the variable-section cylinder 2. The shrinkage type air inlet pipeline 1 and the variable cross-section cylinder body 2 are of independent structures, and each part can be processed independently and is convenient to process. The inner surface of the contracted end of the contracted air inlet pipeline 1 is in smooth transition connection with the surface of the air inlet port of the variable-section spiral air inlet channel 3, so that organic working medium can smoothly enter the variable-section spiral air inlet channel 3 from the contracted air inlet pipeline 1.
The contracted air inlet pipeline 1 in the embodiment of the utility model adopts a contracted variable cross-section structure, the cross section of the expanded end of the contracted variable cross-section structure is a circular cross section, the cross section of the contracted end is an elliptical cross section, that is, the pipeline inlet cross section of the contracted air inlet pipeline 1 is a circular cross section, and the pipeline outlet cross section is an elliptical cross section. The circular area of the expansion end of the contracted air intake pipe 1 needs to be determined according to the air intake speed and the standard pipe diameter, and the air intake angle, the eccentric distance and the air intake cylinder height need to be considered in design, so the circular area of the expansion end of the contracted air intake pipe 1 needs to be determined according to practical situations.
The variable cross-section spiral air inlet channel 3 is a symmetrical variable cross-section spiral air inlet channel with the contracted air inlet pipeline 1 as the center, as shown in figure 5. The included angle theta between the normal line and the central line at any section position of the variable-section spiral air inlet channel 3 is transited from 0 degree to 180 degrees. It is generally believed that the fluid velocity and density in the spiral channel remain the same, and the flow rates at different θ angular sections in the spiral channel are: q (Q) Vθ ＝(Q V 2) × (θ/180 °), the cross-sectional area corresponding thereto being: a is that θ ＝Q Vθ C, wherein Q V For the flow rate at the inlet of the air inlet chamber, θ is the angle between the normal line and the central line at any section position, and C is c=c 180 -is A 180 The air flow velocity at the cross section. After the fluid enters the spiral channel, the distribution is uneven, the resistance of the upper and lower parts of the spiral channel is different, so that the area size at theta-0 DEG is A when designing 0 Larger than the value actually calculated. In terms of aerodynamic performance, the gas is contracted along the edgesThe air inlet pipeline 1 enters the variable-section spiral air inlet channel 3, and then enters the nozzle 02 from the variable-section spiral air inlet channel 3, so that the flow lines are distributed uniformly, the flow loss is reduced, and the special design of the contracted air inlet pipeline 1 and the design of the variable-section cylinder 2 can also have good pre-rotation and flow guiding effects on the air flow at the inlet of the nozzle 02.
The embodiment of the utility model also compares the performance of the relative efficiency-expansion ratio and the relative flow-expansion ratio of the air inlet volute 01 and the cylindrical air inlet volute, and the results are shown in figures 6 and 7. Under the same working condition, the efficiency of the air inlet volute 01 provided by the embodiment of the utility model is improved by 2.3% compared with that of a cylindrical air inlet volute. Therefore, the through-flow capacity of the air inlet volute 01 provided by the embodiment of the utility model is improved, and the same nozzle and impeller structure can be matched.
Based on the air intake volute provided by the embodiment of the utility model, the embodiment of the utility model also provides an expander, which comprises the air intake volute 01, a nozzle 02, an impeller 03 and a diffuser 04, as shown in fig. 8 and 9. Specifically, an air outlet port of the variable-section spiral air inlet channel 3 in the air inlet volute 01 is communicated with an air inlet end of the nozzle 02, the air outlet end of the nozzle 02 is communicated with the impeller 03, and a diffuser pipe 04 is arranged on the periphery of the impeller 03. When the expander provided by the embodiment of the utility model is designed, the air inlet volute 01 needs to have uniform fluid flowing through the air inlet volute 01 as much as possible, the pressure loss is as small as possible, and the requirements on both pneumatic performance and process performance are considered; the nozzle 02 needs to ensure that the fluid is able to achieve the designed speed and direction before the inlet of the impeller 03, while also having good uniformity; the impeller 03 needs to ensure that the fluid keeps flowing smoothly in the flow channel, reduce flow separation as much as possible, and also ensure processing stability and meet requirements of noise, strength and the like.
Fluid enters the nozzle 02 through the air inlet volute 01, expands and accelerates at the nozzle 02 to obtain a certain relative speed, and meanwhile, cooling and depressurization are realized. Fluid with a certain relative speed flows into the impeller 03 rotating at a high speed to do work. After expansion of the impeller 03, the gas flows at a constant velocity toward the diffuser 04 at the outlet of the impeller 03. In the diffuser pipe 04, a part of the kinetic energy of the fluid is converted into pressure energy, and finally the diffused fluid flows out of the diffuser pipe 04 and flows into a downstream pipeline.
The air inlet volute provided by the embodiment of the utility model has the advantages of simple structure, convenience in measurement, low manufacturing cost and particularly good pneumatic performance, and can meet the requirement of the installation of the expander to the greatest extent.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure of the utility model herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.
It is further understood that the use of relational terms such as "first" and "second", and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The utility model is not limited to the precise construction which has been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (5)
1. The air inlet volute chamber is characterized by comprising a contracted air inlet pipeline (1) and a variable-section cylinder body (2), wherein a variable-section spiral air inlet channel (3) is arranged in the variable-section cylinder body (2), and the inner surface of the contracted end of the contracted air inlet pipeline (1) is in smooth transitional connection with the surface of an air inlet port of the variable-section spiral air inlet channel (3).
2. The air intake volute of claim 1, wherein the variable-cross-section spiral air intake passage (3) is a symmetrical variable-cross-section spiral air intake passage centered on the contracted air intake pipe (1).
3. An air intake volute according to claim 2, characterized in that the angle θ between the normal line and the center line at any cross-sectional position of the variable-section spiral air intake passage (3) is transited from 0 ° to 180 °.
4. An air intake volute according to claim 1, wherein the expanded end section of the contracted air intake conduit (1) is circular in cross-section and the contracted end section is elliptical in cross-section.
5. An expander, characterized by comprising an air inlet volute (01), a nozzle (02), an impeller (03) and a diffuser pipe (04) according to any one of claims 1-4, wherein an air outlet port of a variable-section spiral air inlet channel (3) in the air inlet volute (01) is communicated with an air inlet end of the nozzle (02), an air outlet end of the nozzle (02) is communicated with the impeller (03), and the diffuser pipe (04) is arranged on the periphery of the impeller (03).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321105021.0U CN219826932U (en) | 2023-05-10 | 2023-05-10 | Air inlet volute and expander |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321105021.0U CN219826932U (en) | 2023-05-10 | 2023-05-10 | Air inlet volute and expander |
Publications (1)
| Publication Number | Publication Date |
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| CN219826932U true CN219826932U (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202321105021.0U Active CN219826932U (en) | 2023-05-10 | 2023-05-10 | Air inlet volute and expander |
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| Country | Link |
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| CN (1) | CN219826932U (en) |
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2023
- 2023-05-10 CN CN202321105021.0U patent/CN219826932U/en active Active
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