CN219838689U - Propeller guide pipe with built-in fan blades - Google Patents
Propeller guide pipe with built-in fan blades Download PDFInfo
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- CN219838689U CN219838689U CN202320699799.2U CN202320699799U CN219838689U CN 219838689 U CN219838689 U CN 219838689U CN 202320699799 U CN202320699799 U CN 202320699799U CN 219838689 U CN219838689 U CN 219838689U
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- blade
- guide pipe
- propeller
- fan blades
- conduit
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- 238000004904 shortening Methods 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses a propeller conduit with built-in fan blades, which comprises a conduit, a propeller and fan blades, wherein the conduit is conical, the diameter of a front port of the conduit is larger than that of a rear port of the conduit, the propeller is arranged in the conduit, a circle of fan blades with the same shape are arranged behind the propeller, the fan blades are fixedly arranged on the inner wall of the conduit, and all the fan blades are uniformly distributed around the axis of the conduit at equal angles; the blade is in a flat strip shape, the cross section of the blade is in a fusiform shape, the blade root of the blade is connected to the inner wall of the guide pipe, the relative included angle of the blade root relative to the axial direction of the guide pipe is 12-30 degrees, the blade tip of the blade extends along the radial direction to the central axis of the guide pipe, the included angle between the blade tip and the axial direction of the guide pipe is 5 degrees at the maximum, and the included angle between the blade tip and the central axis is gradually reduced to 0 degree along with the shortening of the distance between the blade tip and the central axis; according to the utility model, the fan blades are arranged on the inner side of the guide pipe propeller, so that the circumferential induction speed is reduced by using the fan blades, and the extra thrust is generated, thereby improving the propulsion efficiency.
Description
Technical Field
The utility model belongs to the technical field of ship propellers, and particularly relates to a propeller guide pipe with built-in fan blades.
Background
At present, energy conservation and emission reduction are increasingly emphasized in various countries, and the ship energy conservation technology is increasingly emphasized, and in the aspect of ship propelling, the ship propelling is mainly realized by improving forward flow of paddles and reducing rear tip vortex and hub vortex. The current mainstream energy-saving device is provided with a pre-rotation guide pipe, a rudder ball, a vortex eliminating fin and the like, and the propeller absorbs power of a main engine through rotation, so that when the actual propeller works, the axial induction speed is generated, the circumferential induction speed is also generated, the direction of the circumferential induction speed is the same as the rotation direction of the propeller, and the combination effect of the circumferential induction speed and the rotation direction of the propeller is expressed as that water flow has a torsion phenomenon after passing through the disc surface of the propeller. The axial induction speed is a key for generating thrust required by the ship, and if the peripheral induction speed which is generated along with the ship can be reduced, the efficiency of the propeller can be improved, and the existing propeller is lack of treatment and conversion of the peripheral induction speed, so that the loss of power of a host machine and the waste of fuel are caused.
Disclosure of Invention
In order to solve the above problems and technical needs, the present utility model provides a propeller duct with built-in blades, wherein the blades are mounted on the inner side of the duct propeller, so that the circumferential induction speed is reduced by using the blades, and additional thrust is generated, thereby improving the propulsion efficiency.
The technical scheme of the utility model is as follows: a propeller guide pipe with built-in fan blades comprises a guide pipe, a propeller and fan blades, wherein the guide pipe is conical, the diameter of a front port of the guide pipe is larger than that of a rear port of the guide pipe, the propeller is arranged in the guide pipe, a circle of fan blades with the same shape are arranged behind the propeller, the fan blades are fixedly arranged on the inner wall of the guide pipe, and all the fan blades are uniformly distributed around the axis of the guide pipe at equal angles; the blade is flat and strip-shaped, the cross section of the blade is fusiform, the blade root of the blade is connected to the inner wall of the guide pipe, the relative included angle of the blade root relative to the axial direction of the guide pipe is 12-30 degrees, the blade tip of the blade extends along the radial direction of the central axis of the guide pipe, the included angle between the blade tip and the axial direction of the guide pipe is 5 degrees at most, and the included angle between the blade tip and the central axis gradually reduces to 0 degree along with the shortening of the distance between the blade tip and the central axis.
Further, the diameter of the propeller is D, the length of the blade is r, the thickness of the blade is gradually reduced from the blade root to the blade tip, the thickness of the blade at the position 0.25r away from the blade root is more than or equal to 0.015D, and the thickness of the blade at the blade tip is more than or equal to 0.006D.
Further, the width of the fan blade ranges from 4%D to 7%D, and the width gradually decreases from the blade root to the blade tip of the fan blade.
Further, the whole torsion angle of the fan blade from the blade root to the blade tip is 10-15 degrees.
Further, the deflection direction of the fan blade is opposite to the rotation direction of the propeller, and a certain attack angle is formed between the rear wake flow of the propeller and the upstream surface of the fan blade.
Further, the number of the blades ranges from 4 to 8, and the length of the blades ranges from 20% D to 50% D.
Furthermore, the blade is made of nickel aluminum bronze, no sharp edges or corners are formed on the surface of the blade, the blade root of the blade is welded on the inner side of the guide pipe, the welding part of the blade root is thickened, and the thickened surface is a smooth curved surface.
Further, the main body material of the guide pipe is marine steel, and the inner side of the guide pipe is stainless steel.
Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the fan blade with a certain angle is arranged at the inner side of the guide pipe and behind the propeller, the section of the fan blade and the wake flow behind the propeller form a certain attack angle, the thrust is generated on the fan blade, and under a proper navigational speed, the thrust on the fan blade is larger than the resistance caused by additionally arranging the fan blade, so that the fan blade integrally generates forward thrust, the circumferential rotation speed in the wake flow behind the propeller is converted into axial speed after being collected, the integral thrust of the guide pipe propeller is improved, and the propulsion efficiency of the guide pipe propeller is enhanced; the fan blade in the guide tube is long, narrow, thin, light and thin, and simple in installation process, and is convenient to install and modify in the existing guide tube propellers of various types, so that the effects of saving fuel, reducing energy consumption, saving energy and reducing emission are achieved.
Drawings
FIG. 1 is a perspective view of the rear end view of a propeller duct of the present utility model;
FIG. 2 is a perspective view of the front end of the propeller duct of the present utility model;
FIG. 3 is an overall construction of a catheter with fan blades;
FIG. 4 is a block diagram of a fan blade;
FIG. 5 is a view of a blade tip end face structure of a fan blade;
FIG. 6 is a cross-sectional force analysis of a fan blade;
marked in the figure as: a duct 1, a propeller 2, a fan blade 3, a blade root 4, a blade tip 5.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
As shown in figures 1-5, the propeller guide tube with built-in fan blades comprises a guide tube 1, a propeller 2 and fan blades 3, wherein the guide tube 1 is conical, the main body material of the guide tube 1 is marine steel, the inner side of the guide tube 1 is stainless steel, the diameter of the front port of the guide tube 1 is larger than that of the rear port, the propeller 2 is arranged in the guide tube, a circle of fan blades 3 with the same shape are arranged behind the propeller 2, the fan blades 3 are fixedly arranged on the inner wall of the guide tube, all the fan blades 3 are uniformly distributed around the axis of the guide tube at equal angles, and the number of the fan blades 3 is preferably 4-8.
The blade 3 is in a flat strip shape, the cross section of the blade 3 is in a shuttle shape, the blade root 4 of the blade 3 is connected to the inner wall of the guide pipe, the blade material is nickel aluminum bronze, the surface of the blade is free of sharp edges, the blade root 4 of the blade is welded on the inner side of the guide pipe 1, the welding part of the blade root 4 is thickened, and the thickened surface is a smooth curved surface; the deflection direction of the fan blades 3 is opposite to the rotation direction of the propeller 2, and a certain attack angle is formed between the rear wake flow of the propeller 2 and the upstream surface of the fan blades.
The diameter of the propeller 2 is D, the length of the blade is r, the thickness of the blade 3 gradually decreases from the blade root 4 to the blade tip 5, the thickness of the blade at the position 0.25r away from the blade root is more than or equal to 0.015D, and the thickness of the blade at the position of the blade tip 5 is more than or equal to 0.006D. The width of the blade ranges from 4%D to 7%D, and gradually decreases from the blade root 4 to the blade tip 5 of the blade 3. The length of the fan blade 3 ranges from 20% D to 50% D.
The relative included angle of the blade root 4 relative to the axial direction of the guide pipe is 12-30 degrees, the blade tip 5 of the fan blade extends along the radial direction towards the central axis of the guide pipe, the included angle between the blade tip 5 and the axial direction of the guide pipe 1 is 5 degrees at the maximum, and the included angle between the blade tip 5 and the central axis gradually reduces to 0 degree along with the shortening of the distance between the blade tip 5 and the central axis; the whole torsion angle of the fan blade 3 from the blade root 4 to the blade tip is 10-15 degrees.
The principle of the thrust generated by the fan blade is similar to that of the propeller blade, and a section micro-element dr of the fan blade is taken for force analysis, and the speed triangle of the section micro-element dr is shown in fig. 6. When the water flows at the combined speed V R Angle of attack alpha K When flowing to the blade body, the lifting forces dL and dD are generated. Decomposing the lift force dL into a component force dL in the axial direction a And component force dL in the direction of rotation t The resistance dD is correspondingly decomposed into dD a And dD t . The thrust dT and the rotation resistance dF of the blade body can be expressed as
According to Ru Kefu Stokes lift formula, the lift force generated by dr section on the blade element body is
dL＝ρV R Г(r)dr (1-2)
Substituting formula (1-2) into formula (1-1), and letting dD=εdL (ε is called the lift-to-drag ratio of the leaf element body), the leaf element body torque dQ= rdF, can be obtained
From fig. 1.1 the following relation can be obtained:
substituting the relation into the formula (1-3) to obtain
Integrating the blade root to blade tip along the length direction of the blade and multiplying the blade root by the number Z of the blade to obtain the thrust on the blade
The fan blade with a certain angle is arranged at the inner side of the guide pipe and behind the propeller, so that the section of the fan blade and the wake flow behind the propeller form a certain attack angle, the thrust is generated on the fan blade, and under the proper navigational speed, the thrust on the fan blade is larger than the resistance caused by additionally arranging the fan blade, so that the fan blade integrally generates forward thrust. The device collects and converts the circumferential rotation speed in the wake into an axial speed, and the overall thrust of the conduit propeller is improved by about 1.2%.
While the utility model has been described with respect to several preferred embodiments, the scope of the utility model is not limited thereto, and any changes and substitutions that would be apparent to one skilled in the art within the scope of the utility model are intended to be included within the scope of the utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims (8)
1. A propeller conduit with built-in fan blades, which is characterized in that: the device comprises a guide pipe, a propeller and blades, wherein the guide pipe is conical, the diameter of the front port of the guide pipe is larger than that of the rear port of the guide pipe, the propeller is arranged in the guide pipe, a circle of blades with the same shape are arranged behind the propeller, the blades are fixedly arranged on the inner wall of the guide pipe, and all the blades are uniformly distributed around the axis of the guide pipe at equal angles; the blade is flat and strip-shaped, the cross section of the blade is fusiform, the blade root of the blade is connected to the inner wall of the guide pipe, the relative included angle of the blade root relative to the axial direction of the guide pipe is 12-30 degrees, the blade tip of the blade extends along the radial direction of the central axis of the guide pipe, the included angle between the blade tip and the axial direction of the guide pipe is 5 degrees at most, and the included angle between the blade tip and the central axis gradually reduces to 0 degree along with the shortening of the distance between the blade tip and the central axis.
2. A propeller conduit with built-in blades as claimed in claim 1, wherein: the diameter of the propeller is D, the length of the blade is r, the thickness of the blade is gradually reduced from the blade root to the blade tip, the thickness of the blade at the position 0.25r away from the blade root is more than or equal to 0.015D, and the thickness of the blade at the blade tip is more than or equal to 0.006D.
3. A propeller conduit with built-in blades as claimed in claim 2, wherein: the width of the fan blade ranges from 4%D to 7%D, and the width gradually decreases from the blade root to the blade tip of the fan blade.
4. A propeller conduit with built-in blades as claimed in claim 3, wherein: the whole torsion angle of the fan blade from the blade root to the blade tip is 10-15 degrees.
5. The propeller conduit with built-in fan blades of claim 4, wherein: the deflection direction of the fan blades is opposite to the rotation direction of the propeller, and a certain attack angle is formed between the rear wake flow of the propeller and the upstream surface of the fan blades.
6. The propeller conduit with built-in fan blades of claim 5, wherein: the number of the fan blades ranges from 4 to 8, and the length of the fan blades ranges from 20% D to 50% D.
7. The propeller conduit with built-in fan blades of claim 6, wherein: the blade is made of nickel aluminum bronze, no sharp edges or corners are formed on the surface of the blade, the blade root of the blade is welded on the inner side of the guide pipe, the welding part of the blade root is thickened, and the thickened surface is a smooth curved surface.
8. The propeller conduit with built-in fan blades of claim 7, wherein: the main body material of the guide pipe is marine steel, and the inner side of the guide pipe is stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320699799.2U CN219838689U (en) | 2023-04-03 | 2023-04-03 | Propeller guide pipe with built-in fan blades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320699799.2U CN219838689U (en) | 2023-04-03 | 2023-04-03 | Propeller guide pipe with built-in fan blades |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219838689U true CN219838689U (en) | 2023-10-17 |
Family
ID=88305081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320699799.2U Active CN219838689U (en) | 2023-04-03 | 2023-04-03 | Propeller guide pipe with built-in fan blades |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219838689U (en) |
-
2023
- 2023-04-03 CN CN202320699799.2U patent/CN219838689U/en active Active
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