JP2010071272A - Fluid machine in which flow stabilizer is fitted in tunnel shape in coaxial groove and edge and at end of blade of fluid machine in consideration of height, width, and resistance since blade of fluid machine makes parallel flow area and provides entrained flow on outer periphery and which is subject to total wedge treatment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade for reducing resistance by a total wedge treatment by providing a coaxial groove and an edge to the blade, identifying flow areas, and fitting a flow stabilizer in a tunnel shape into the outermost periphery of the blade as a result of the analysis of the flow of a fluid and the changes of volume and density under the conditions in which the blade of the fluid machine does not have a mechanism for axially moving the fluid, the absence of the mechanism generates a centrifugal force, and a defect such as cavitation is left unrepaired. <P>SOLUTION: This fluid machine is adaptable to both an improvement measure in which a conventional processing method is used and a method in which the entire blade is made by assembling novel plate parts. In any case, the measure against cavitation is taken by providing the mechanism for causing an axial flow to the blade. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  Since all current blades, propellers, blades, and impellers are composed of free-form surfaces, a mechanism for applying pressure to the fluid in the axial direction is missing. The target rotational force and compressive force transmit the axial component force corresponding to the pitch of the blades depending on the rotation of the shaft, and there is no mechanism for extracting the rotational force itself. In order to provide a mechanism for transmitting force in the axial direction, it is best to provide a transmission mechanism for the blade.

  The ship propeller has not changed in shape since 1800 because there is no supporting theory or research on how to improve the direction of compression or the direction of rotation to improve the blades. Or turbine blades have been in the same shape for over 60 years. However, the current blades have basically the same shape as the blades used in the agitating machine, and the lack of theory for improving the blades is the cause of the failure to improve the blade defects.

  It is technically a big problem that the blades of the machine that applies the compressive force or the machine that obtains the rotational force are basically not different from the blades of the agitator machine. Analyzes must be made to explore the relationship between fluid movement and machine movement.

The fluid also swirls as the blades rotate. Of course, there is also axial movement. There is also an unstable part that turns in the middle of the flow in the turning direction and the axial direction or moves in the axial direction.
Rotation of the machine (1) The part that makes a swivel motion depending on the rotation of the wings.
(2) A portion that moves in the axial direction.
(3) Unstable parts that move both in the swivel and axial directions.
The fluid moves in three ways: (1), (2), and (3). The movement of (1) is the movement of the fluid due to the frictional resistance with the blade and the pressure corresponding to the pitch of the blade, and the resulting movement of the fluid.
Part (3) undergoes a volume product change when moving to (1). When the density changes due to the changing speed, the density changes to a reduced pressure state.
The change in density cannot produce the force indicated by the volume of the fluid at constant pressure. The tendency of decompression is shown.
Depending on the difference in the speed of moving in the axial direction at this changing speed, the fluid moves toward the higher speed and moves in the direction of (1). (3) further has a negative pressure tendency from a reduced pressure tendency.
There is a position where (3) surely follows (1) and (2) also moves to (1) at the same time. The position with the strongest centrifugal force. The tip of the blade. Here, it is completely in a negative pressure state. There is no axial force.
The generation of overflow occurs in the negative pressure state, and the accompanying flow flows back into the overflow portion from the surroundings, resulting in an output loss. Therefore, the generation of centrifugal force and (3) are analyzed, and the problem of centrifugal force is the subject of analysis as a negative pressure problem.
The phenomenon in which the surrounding fluid flows into the blade tip as a reverse flow obviously causes an output loss, but also causes cavitation and the like. Analysis of this point is missing.

There seems to be no improvement in the industry magazines or catalogs of each manufacturer, company information, etc., and there seems to be no change in the product.
A product with the same shape as a ship's propeller has the same energy loss.
A, Improvement method (1) A concentric groove and edge are provided to clarify the basin of the blade.
The center part of the shaft is provided with an edge for exclusion from the basin. Create parallel flow and do not cross the flow at the axial center.
(2) An axial concentric arc flow stabilizer is provided at the tip of the blade, and the stabilizer is installed in the form of a tunnel considering lightness, toughness, and resistance so that a follower flow is generated at the outer periphery.
(3) Full wedge processing.
B, Method contents (1) In the case of casting.
Use grooves as much as possible in the conventional milling process. As shown in FIG. Common to all axial flow machines.
(2) When blades and grooves are assembled with plate parts. As shown in FIG.

Common items for improved feathers.
(1) The torsional strength of the blade is increased.
(2) The blade tip can be widened.
(3) The axial basin can be excluded from the blade basin.
(4) There is no reverse flow. Along with the inflow parallel to the axis, the flow is parallel to the axis.
(5) The method (2) described above significantly reduces the number of hand finishing steps.

  The cause of fluid machine defects, cavitation, etc. lies in the blades. If the shape of the blade is improved, a mechanism for flowing fluid in the axial direction is obtained. Moreover, the subject that the parallel flow area | region of a blade | wing and the accompanying inflow of an outer peripheral part prevent generation | occurrence | production of the cavitation etc. which depend on a centrifugal force according to the mechanism.

最外周部安定板流入量目標値＝∫_Ｙ（最外周長さ×トンネル高さ_Ｙ×トンネル巾）
遠心力概算参考トルク計算
機械回転力；Ｆ、遠心力；Ｆ_１ 圧縮力；Ｆ_２、羽根の半径；Ｒ，
半径方向の位置；ｒ、ｒの位置の羽根巾；ｄ、Ｒの位置の羽根巾；Ｄ
Ｆ_１＝Ｆ×Ｒ＞Ｆ_２＝Ｆ×Ｄ‥‥‥（圧縮力、回転力、無い状態）
Ｆ_１＝Ｆ×ｒ＜Ｆ_２＝Ｆ×ｄ‥‥‥（遠心力の流れ混在の状態）
解決する事は遠心力流れ混在状態を無くす事。

Outermost circumference stabilizing plate inflow target value = ∫ _Y (Outermost circumference length x Tunnel height _Y x Tunnel width)
Centrifugal force approximate reference torque calculation Machine rotational force; F, centrifugal force; F ₁ compression force; F ₂ , blade radius; R,
Radial position; blade width at positions r and r; blade width at positions d and R; D
F ₁ = F × R> F ₂ = F × D (compressive force, rotational force, no state)
F ₁ = F × r <F ₂ = F × d (state of mixed flow of centrifugal force)
The solution is to eliminate the mixed flow of centrifugal force.

  When measures are taken in casting, both plate parts and parts assembly methods can be used. Also, the blades can be downsized

The output at the outermost periphery of the blade can be effective.
Output effect, energy effect, noise effect, product life effect are enhanced.
In the case of the plate part assembly method, the number of hand finishing steps will be greatly reduced.

Fire extinguishing est based on candles. Comparative test.
Smoke test: Overflow flow around the outer periphery, comparative test.
(The ventilation fan was modified and used as a test product.)

···························································································. And cross-sectional shape. ……………… Drawings for assembling plate parts. And cross-sectional shape.

Explanation of symbols

1 ...... Vane, propeller, blade, impeller.
2 ... groove.
3 ... Edge or basin introduction plate.
4 ・ ・ ・ ・ ・ Outermost peripheral stabilizer.
5 ... Wedge shaped processing part.
6 ・ ・ ・ ・ ・ Shaft or axial center part.
AA ... A-A cross section.
BB ... BB cross section.

Claims (1)

  Analyzes the correlation between the curved surfaces of fluid blades, propellers, blades, and impellers, and fluids. Shafts are concentric arc-shaped grooves and edges, and light weight and toughness at the outermost periphery. Tunnel-shaped flow stability. An axial flow machine that has a plate and is processed in the form of a wedge, and has been improved so that fluid can be obtained in parallel flow where the flow does not intersect at the axial center of the shaft, and the follower flow from the periphery at the outermost peripheral portion.

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