CN110878767A - Large chord length inlet guide vane structure - Google Patents
Large chord length inlet guide vane structure Download PDFInfo
- Publication number
- CN110878767A CN110878767A CN201911099406.9A CN201911099406A CN110878767A CN 110878767 A CN110878767 A CN 110878767A CN 201911099406 A CN201911099406 A CN 201911099406A CN 110878767 A CN110878767 A CN 110878767A
- Authority
- CN
- China
- Prior art keywords
- guide vane
- chord length
- blade
- inlet guide
- stator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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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
- 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
- F04D29/444—Bladed diffusers
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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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
- F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/14—Preswirling
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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 discloses a large chord length inlet guide vane blade structure which comprises a guide vane, wherein the guide vane is a non-fan-shaped guide vane, the top of the guide vane is arc-shaped, the bottom of the guide vane is a widened part, and central angles corresponding to two end parts of the widened part are smaller than the arc-shaped central angle of the top of the guide vane. According to the invention, the widened part is arranged on the guide vane blade, so that the chord length of the blade close to the circle center can be increased, and the prerotation capability is strong, therefore, the adjusting capability and the energy-saving capability are relatively improved; in addition, the widening part is further widened at the two ends of the guide vane blade, so that the adjusting capacity of the blade can be further increased.
Description
Technical Field
The invention relates to the technical field of centrifugal fans, in particular to a large-chord-length inlet guide vane structure.
Background
The traditional inlet guide vane is also called a petal type adjusting door at present, is commonly used for a ventilator inlet and is used for adjusting the flow and the pressure of the ventilator, the structural schematic diagram is shown in figure 1, the object is shown in figure 2, the traditional inlet guide vane is composed of a guide vane (1), a flange (2), a support rod (3) and the like, a connecting rod drives blades to rotate around respective shafts, the effective flow area of the inlet guide vane is changed, the direction of airflow is changed, the airflow is enabled to generate convolution along the circumference, and the convolution flow is called inlet pre-rotation for a centrifugal fan impeller inlet. The airflow prerotation direction is positive prerotation which is the same as the rotation direction of the impeller. According to the Euler equation, the positive prerotation can reduce the work capacity of the centrifugal fan and reduce the pressure of the fan. The inlet guide vane adjusting function is that the flow and the pressure of the centrifugal fan are adjusted by the combined action of two aspects of resistance increase caused by area reduction and pressure decrease caused by prerotation increase of the centrifugal fan, wherein the pressure decrease generated by airflow prerotation adjustment is accompanied with the power decrease of the centrifugal fan, and the inlet guide vane adjusting function is an energy-saving adjusting mode and needs to be distinguished from an adjusting mode (which is not an energy-saving adjusting mode) depending on resistance (loss) increase.
Since the conventional inlet guide vane has the shape of a blade divided equally according to the circumference, taking an inlet guide vane with 9 blades as an example, the central angle of the blade is 40 degrees (30 degrees when 12 blades are used), and so on), as shown in fig. 3, the chord length of the blade at the position close to the central angle is only a fraction of the outer edge, and the chord length of the blade is reduced due to the reduction of the radius. The shorter the vane chord length is, the weaker the guiding ability to the air flow, i.e., the ability to generate pre-swirl, and the adjusting ability and the energy saving ability become weaker.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one object of the present invention is to provide a large chord length inlet guide vane structure, which increases the chord length of the vane, reduces the central angle of the vane, and enhances the prerotation capability of the vane.
The technical scheme of the invention is as follows:
the utility model provides a big chord length import stator blade structure, includes the stator, the stator is non-fan-shaped stator, the stator top is an arc, and the stator bottom is a widened portion, the central angle that the widened portion both ends correspond is less than the curved central angle in stator top.
Further, the widened portion is preferably shaped like an isosceles trapezoid.
Furthermore, the arc central angle of the top of the guide vane is 360 degrees/n, and n is the number of the guide vanes.
Furthermore, the central angle of the two ends of the guide vane is preferably 360 degrees/2 n, and n is the number of the guide vanes.
Furthermore, the guide vanes are parallel to the two ends and widened by 10% -40% in the horizontal direction.
The invention has the following beneficial effects: the guide vane blade is provided with the widened part, so that the chord length of the blade close to the circle center can be increased, and the prerotation capacity is strong, so that the adjusting capacity and the energy-saving capacity are relatively improved; in addition, the widening part is further widened at the two ends of the guide vane blade, so that the adjusting capacity of the blade can be further increased.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a conventional inlet guide vane structure;
FIG. 2 is a pictorial view of a conventional inlet guide vane;
FIG. 3 is a schematic view of a conventional inlet guide vane blade shape;
FIG. 4 is a schematic view of the large chord length inlet guide vane blade shape of the present invention;
FIG. 5 is a schematic view of another large chord length inlet guide vane blade shape of the present invention;
FIG. 6 is a schematic view of the direction of leakage flow with conventional inlet guide vanes closed;
FIG. 7 is a schematic view of the leakage flow direction with the large chord length inlet guide vanes closed according to the present invention;
in the figure: 1-guide vanes; 2-a flange; 3-supporting rods; 4-widening of the section.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 4, a big chord length inlet guide vane blade structure, including stator 1, stator 1 is non-fan-shaped stator, 1 top of stator is an arc, and stator 1 bottom is a widening portion 4, the central angle that the two ends of widening portion 4 correspond (being the reverse extension line of the arc line at 4 both ends of widening portion and top) is less than the curved central angle in 1 top of stator. The widening part 4 is preferably in an isosceles trapezoid shape, so that the guide vane 1 is convenient to mount and use, and the included angle between the two waists of the widening part is smaller than the arc-shaped central angle of the top of the guide vane 1, so that the bottom of the widening part has larger chord length (the chord length of the blade close to the center of the circle can be increased), and the widening part has stronger prerotation capacity, and therefore the adjusting capacity and the energy-saving capacity are relatively improved.
In fig. 4, the arc central angle of the top of the guide vane is 40 °, corresponding to 9 vanes (similarly, 12 vanes or other number of vanes, i.e. n vanes, corresponding to 360 °/n), wherein the central angle of the guide vane corresponding to the two ends of the widening 4 is preferably half of the arc central angle of the top, i.e. 20 °.
Referring to fig. 5, the improvement of the guide vane blade in fig. 4 is that the two ends of the guide vane 1 are parallel and widened by 10% -40% in the horizontal direction, that is, the chord length of the guide vane is increased by 10% -40% compared with that in fig. 4.
The air leakage direction of the conventional guide vane blade is shown in fig. 6 when the conventional guide vane blade is closed, the chord length of the blade exceeds that of the conventional inlet guide vane, so that the blade of the conventional guide vane blade can not be completely closed at 90 degrees like the conventional inlet guide vane but is closed in an overlapped mode, the blade angle is smaller than 90 degrees when the conventional guide vane blade is closed, as shown in fig. 7, the blade can also generate prerotation when the conventional guide vane blade is closed because the blades are overlapped, and the power of a centrifugal fan closed by the inlet guide vane with large chord length is smaller than that of the conventional inlet guide.
In the present application, the structures and the connection relations that are not described in detail are all the prior art, and the structures and the principles thereof are known in the prior art and are not described herein again.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a big chord length inlet guide vane blade structure, includes the stator, its characterized in that: the stator is non-fan-shaped stator, the stator top is an arc, and the stator bottom is a widened portion, the central angle that the widened portion both ends correspond is less than the curved central angle in stator top.
2. The large chord length inlet guide vane blade structure of claim 1, wherein: the widening is preferably shaped as an isosceles trapezoid.
3. The large chord length inlet guide vane blade structure of claim 1, wherein: the arc central angle of the guide vane top is 360 degrees/n, and n is the number of the guide vanes.
4. The large chord length inlet guide vane blade structure of claim 1, wherein: the central angle of the two ends of the guide vane is preferably 360 degrees/2 n, and n is the number of the guide vanes.
5. The large chord length inlet guide vane blade structure of claim 1, wherein: the guide vanes are parallel to the two ends of the guide vanes and are widened by 10-40% in the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911099406.9A CN110878767A (en) | 2019-11-12 | 2019-11-12 | Large chord length inlet guide vane structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911099406.9A CN110878767A (en) | 2019-11-12 | 2019-11-12 | Large chord length inlet guide vane structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110878767A true CN110878767A (en) | 2020-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911099406.9A Pending CN110878767A (en) | 2019-11-12 | 2019-11-12 | Large chord length inlet guide vane structure |
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| Country | Link |
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| CN (1) | CN110878767A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112828A (en) * | 2020-09-09 | 2020-12-22 | 贵州电网有限责任公司 | Ventilation device for distribution room of transformer substation |
-
2019
- 2019-11-12 CN CN201911099406.9A patent/CN110878767A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112828A (en) * | 2020-09-09 | 2020-12-22 | 贵州电网有限责任公司 | Ventilation device for distribution room of transformer substation |
| CN112112828B (en) * | 2020-09-09 | 2021-12-03 | 贵州电网有限责任公司 | Ventilation device for distribution room of transformer substation |
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