KR101883834B1 - Mixed flow impeller having forward curved blade with mean camber line shape section of airfoil - Google Patents

Abstract

The present invention relates to a full-grain mixed impeller having a cross section in the form of an airfoil average camber line, in which a rotating shaft is fixed at the center and is formed to rotate around the rotating shaft, and a radially outer circumferential portion of the impeller forms a reference point C An abacus plate including a swash plate formed obliquely at an oblique angle &thetas; A plurality of fingers disposed on the swash plate of the main plate, the plurality of fingers being spaced apart from each other in the circumferential direction; And a side plate disposed opposite the swash plate and coupled with the nests; Wherein the plunger is formed of an overhead cheek bent in the rotational direction of the main plate and the plunger is formed to have an average camber line-shaped cross section of the airfoil, thereby improving the performance and efficiency of the blower or the pump And a loss is reduced to be applied to an axial flow type fan to improve the efficiency and to improve the flow in the jet passage to reduce the noise generated in the impeller, .

Description

[0002] Mixed flow impellers having forward curved blades with mean camber line shape section of airfoil [

The present invention relates to an all-round mixed impeller having an average camber line-shaped cross section, in which a collar provided on a main plate is formed of an all-round collar formed by bending toward the rotation direction of the main plate, Sectional view of an impeller having a cross section in the form of an average camber line capable of improving the performance and efficiency of a blower or a pump.

The impeller is a main part of a pump, blower or compressor. The impeller is rotated with several fulcrums arranged at the same interval on the circumference. The impeller is connected to the drive motor and connected to the impeller. When energy flows out, energy is created.

In general, the impeller feather is divided into a centrifugal type and an axial flow type, and a centrifugal pulsator flows fluid perpendicular to the rotating shaft, and the axial flow pulp causes fluid to flow in the direction of the rotating shaft.

Meanwhile, the above-mentioned impeller is also used for the mixing of fluids and the like, and a conventional centrifugal impeller configured to be used for mixing fluids is as follows.

Fig. 1 is a front view of a conventional centrifugal impeller, and Fig. 2 is a side sectional view of Fig. 1. Fig. As shown in the drawing, a conventional centrifugal impeller is composed of a main plate 1, a side plate 2, a collet 3 and a rotating shaft 4. By rotating the rotating shaft 4, fluid is sucked through the suction port S1, And is discharged to the impeller outlet S2 through the catheter passage formed by the main plate 1, the side plate 2 and the collar 3 to apply energy to the fluid.

And, the collar 3 of the centrifugal impeller is connected to the main plate 1 and the side plate 2, and a plurality of vanes 3 are radially arranged and the nests are formed in a slightly curved plate shape. A convex surface 3 'curved concavely inwardly and a convex convexly convexed surface 3' appear inside the bent collar 3. At this time, in the vicinity of the concave convex surface 3 ', the convex surface 3' The pressure of the fluid is formed to be low. Therefore, due to the peeling of the fluid flow near the concave surface 3 'of the vane 3, the reverse flow region is generated as shown in Fig. 2, and the performance of the impeller is lowered.

Since the impeller has a limited number of vanes 3 and the fluid has a viscosity, the relative velocity of the fluid at the impeller outlet S2 due to the friction in the pail passage, the peeling of the flow, etc., And the discharge direction of the fluid is gradually different from that of the exit pinion as the number of the vanes 3 decreases.

Because of this phenomenon, the sliding velocity is generated at the impeller outlet S2 and the sliding velocity is generated in the direction opposite to the direction of rotation of the impeller, which causes the pressure head of the impeller to be decreased. As the sliding velocity increases, The performance and efficiency of the impeller is reduced.

The performance deterioration of the centrifugal impeller is caused by the increase of the shaft force for driving the impeller and the deterioration of the efficiency. If some of these factors are removed, the performance of the centrifugal impeller is improved.

In the case of the centrifugal impeller having a small ratio of the outlet width to the diameter, since the difference between the radius of curvature of the side plate 2 and the curvature radius of the main plate 1 is small and the feather passage is long, the flow accelerated in the side plate inlet 2 ' Is accelerated again when reaching the impeller outlet (S2), and even if the static pressure is reduced at the side plate inlet (2 ') of the inlet, the flow in the vane passage accelerates without generating an overall deceleration, The flow is not peeled from the side plate inlet 2 'despite the pressure gradient in the largely formed catheter passage.

In the case of the centrifugal impeller having a large ratio of the outlet width to the diameter, since the difference between the radius of curvature of the side plate 2 and the radius of curvature of the main plate 1 is large and the feather passage is short, the flow accelerated at the side plate inlet 2 ' The speed distribution at the impeller outlet S2 is discharged in a state in which the side plate inlet 2 'is greatly increased as compared with the side of the suction port S1.

At this time, according to the inner wall surface of the side plate 2, a flow phenomenon similar to the flow phenomenon occurs in which a back pressure gradient with strong flow is formed, so strong peeling phenomenon occurs at the side plate inlet 2 ' The jet passage of the inner wall surface of the side plate 2 is completely blocked and a strong backwash region is formed in the vicinity of the side plate outlet 2 ".

When such a phenomenon occurs, due to the peeled flow, the feather passage of the inner wall surface of the side plate 2 is completely shut off, so that the radial velocity is greatly reduced at the side plate outlet 2 ", and the sliding velocity is rapidly increased, The performance and the efficiency of the impeller are significantly deteriorated.

However, as the width of the impeller feather passage increases, the flow is peeled off from the side plate as shown in Fig. 2, causing a swirling flow in the impeller feather passage, resulting in energy loss due to peeling.

When the conventional centrifugal impeller is applied to an in-line duct-fan, the flow from the impeller outlet S2 is discharged in a radial direction as shown in FIG. 2, The efficiency of the in-line duct blower is reduced due to the energy dissipation caused by the collision at the wall surface of the duct (D) without inducing the flow in the duct wall in the axial direction.

In addition, the sliding speed is a factor that greatly affects the performance of the centrifugal impeller. As the sliding speed increases, the efficiency of the centrifugal impeller is greatly reduced.

Thus, the formation of the countercurrent region, that is, a part of the flow path due to the peeling of the flow is interrupted, and the radial velocity and the tangential velocity in the countercurrent region are reduced to deteriorate the performance of the impeller.

KR 20-0241247 Y1 (July 24, 2001)

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for manufacturing the same, wherein the swash plate of the main plate is formed obliquely at an acute angle? So that the flow is smoothly transferred, and the direction of discharge from the impeller outlet is changed from the radial direction to the axial direction (i.e., from the radial direction to the axial direction) And the efficiency of the impeller is increased so that the performance of the blower or the pump is greatly improved.

In addition, since the cross section of the feathers is an all-inclined cross-section having an airfoil average camber line shape, it can be used for an axial flow type blower. When applied, the flow in the impeller flow path is smoothly changed in the axial direction The efficiency is improved, the operating point can be changed, the flow in the impeller pulley passage can be improved to reduce the noise generated in the impeller, and the impeller can be rotated at the initial rotation The present invention provides an all-round mixing impeller having an average camber line-shaped cross section that reduces the weight moment of the impeller by reducing the weight of the impeller by forming a camber line profile to form an airfoil average camber line shape to eliminate the risk of structural breakage There is another purpose.

In order to achieve the above object, the present invention provides an all-camouflage impeller (1000) having an average camber line shape, characterized in that the rotary shaft (100) is fixed at the center and is rotated about the rotary shaft And an inclined plate (210) having a radially outer circumferential portion inclined with respect to a reference point (C) at an obliquely incident angle (?); A plurality of feathers 300 installed on the swash plate 210 of the main plate 200 and spaced apart from each other in the circumferential direction; And a side plate (400) disposed opposite to the swash plate (210) and coupled with the vanes (300); The collar 300 may be formed as an angled cheek bent in the rotational direction of the main plate 200 and the collar 300 may have an average camber line cross section.

The vanes 300 protrude in a direction perpendicular to the swash plate 210 and the side plates 400 are coupled to the upper side of the vases 300. The swash plate 210, And a discharge port 320 is formed on one side of the fluid channel 310. The fluid channel 310 is formed between the fluid channel 310 and the fluid channel 310,

Further, the inclined angle &thetas; of the swash plate 210 is set to 10 DEG to 50 DEG.

In addition, the side plate 400 is formed with a suction port 410 opened at the center of the upper side, and is formed in a pointed shape with an open upper center portion.

The collar 300 may be formed by setting a line connecting the inner end A and the outer end B as a straight line to a chord line 301 of the vowel 300, And the curvature of the vane 300 is set by designating the relative height of the airfoil average camber line to the airfoil average camber line.

The reference angle? 1 of the collar 300 is set to 10 to 120 degrees. The length of the collar 300, the shape of the curved line, the shape of the curved line, And the entrance pupil? 1 and the exit pupil? 2 are changed.

In the case of an all-camphor mixture impeller having an average camber line-shaped cross section according to the present invention, when the impeller is rotated, the fluid is smoothly conveyed because the fluid is not separated between the feathers and the feathers, The flow direction is changed from the radial direction to the axial direction so that the flow energy is efficiently utilized and the operating efficiency of the impeller is increased, thereby greatly improving the performance of the blower or the pump.

In addition, since the cross section of the feather is formed in the form of an average camber line, it can be used in an axial flow type blower. When applied, the flow in the jet passage of the impeller is softened to naturally change the discharge direction in the axial direction, As a result, the efficiency of the axial flow type multistage blower can be improved, the operating point can be changed, and the flow in the impeller blade passage can be improved to reduce the noise generated in the impeller.

In addition, the weight of the collar can be reduced to reduce the overall weight of the impeller, thereby reducing the moment of inertia of the impeller, thereby reducing the risk of structural damage to the rotating shaft during the initial rotation of the impeller.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a top plan view of a conventional backward centrifugal impeller.
2 is a cross-sectional view of a conventional blower with a backward-facing centrifugal impeller and an impeller disposed in an in-line duct;
FIGS. 3 and 4 are a top plan view and a front cross-sectional view, respectively, of a full-grain mixed impeller having an average camber line shaped cross section according to an embodiment of the present invention.
Figure 5 is a partial enlarged view of Figure 3;
6 is a schematic view showing the cross-sectional shape of the airfoil and the average camber line.
7 is a graph showing the relationship between air volume and static pressure according to an embodiment of the present invention.
FIG. 8 is a graph showing the relationship between air volume and total efficiency according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are a top plan view and a front sectional view, respectively, of a full-grain mixed impeller having a cross section in the form of an average camber line according to an embodiment of the present invention, FIG. 5 is a partially enlarged view of FIG. Sectional shape of the foil and average camber line.

As shown in the figure, an all-round mixed impeller 1000 having an average camber line shape according to an embodiment of the present invention can be used for a blower or a pump. The rotary shaft 100 is fixed at the center, (200) which is formed to be rotated around the center axis (100) and has a radially outer peripheral portion inclined at an acute angle (?) With respect to a reference point (C); A plurality of feathers 300 installed on the swash plate 210 of the main plate 200 and spaced apart from each other in the circumferential direction; And a side plate (400) disposed opposite to the swash plate (210) and coupled with the vanes (300); The collar 300 may be formed as an angled cheek curved in the rotational direction of the main plate 200 and the collar 300 may have an average camber line cross section of the airfoil.

First, an all-round mixed impeller 1000 having an average camber line-shaped cross section according to the present invention comprises a main plate 200 having a swash plate 210, a plurality of vanes 300 formed on the swash plate 210, And the vanes 300 may be formed to have an average camber line-shaped cross-section of an airfoil formed as an entirely curved vane.

More specifically, the main plate 200 is formed by a flat circular plate having a central portion, and a circumferential portion, which is radially outward, is formed on a swash plate 210 (see FIG. 1) formed obliquely at a sweep back angle . In other words, the center of the flat disk may be formed of the inclined plate 210 which is inclined downward in the radial direction. The inclined plate angle? Of the swash plate 210 may be represented by an outer angle formed by the swash plate 210 and the flat portion of the central portion of the main plate 200. The rotating shaft 100 may be fixed to the center of one side of the main plate 200 and the rotating shaft 100 may be coupled to the lower surface of the main plate 200 as shown in FIG. The rotary shaft 100 may be formed integrally with the main plate 200. The rotary shaft 100 and the main plate 200 may be separately formed and assembled using welding or fastening means.

A plurality of vanes 300 may be formed on the other surface of the main plate 200. That is, the rotating shaft 100 may be formed on the lower surface of the main plate 200, and the vanes 300 may be formed on the upper surface of the opposite side. At this time, the vanes 300 are formed on the swash plate 210 of the main plate 200 and can be disposed apart from each other along the circumferential direction.

Here, the feathers 300 may be formed as a full-curved cheek bent in the rotation direction of the main plate 200. That is, the inner edge portion A corresponding to the leading edge portion of the vane 300 is inclined toward the outer edge portion B toward the outer edge portion B corresponding to the trailing edge portion, And may be bent toward the rotation direction toward the outer end portion B to be convex in the direction opposite to the rotation. In addition, the vanes 300 may be formed to have a cross section in the mean camber line shape of the airfoil. The feathers 300 may be integrally formed with the main plate 200 or may be formed separately and the feathers 300 may be coupled to the main plate 200.

The side plate 400 is disposed on the opposite side of the swash plate 210 of the main plate 200 with respect to the collar 300 so that the side plate 400 and the swash plate 210 are spaced apart from each other, (Not shown). That is, the lower side of the feather 300 may be coupled to the swash plate 210, and the upper side of the feather 300 may be coupled to the side plate 400.

Therefore, in the case of a full-mixed impeller impeller having an average camber line-shaped cross section according to the present invention, when the impeller is rotated, the fluid is not smoothly transferred between the feathers and the feathers, Is changed from the radial direction to the axial direction so that the flow energy is efficiently utilized and the operating efficiency of the impeller is increased, thereby greatly improving the performance of the blower or the pump. In addition, since the cross section of the feathers is formed in an entire camber line shape of the airfoil, it can be used in an axial flow type blower. When applied, the flow in the impeller feather channel is softened to smoothly change the discharge direction in the axial direction, The efficiency of the axial flow type blower is improved, the operating point can be changed, and the flow in the impeller blade passage can be improved to reduce the noise generated in the impeller. In addition, the weight of the collar can be reduced to reduce the overall weight of the impeller, thereby reducing the moment of inertia of the impeller, thereby reducing the risk of structural damage to the rotating shaft during the initial rotation of the impeller.

The vanes 300 protrude in a direction perpendicular to the swash plate 210 and the side plates 400 are coupled to the upper side of the vases 300. The swash plate 210, And a discharge port 320 may be formed on one side of the fluid channel 310. The fluid channel 310 may be formed in the fluid channel 310. [

That is, as shown in the drawing, the vanes 300 may protrude in a direction perpendicular to the swash plate 210, and the side plate 400 may be coupled to the upper side of the vanes 300, As shown in FIG. The fluid channel 310 as a passage through which the fluid flows is formed in a shape surrounded by the swash plate 210, the side plate 400 and the two vanes 300 so that the fluid channel 310, which is one side of the fluid channel 310, A discharge port 320 through which the fluid is discharged can be formed.

The inclined angle &thetas; of the swash plate 210 may be 10 DEG to 50 DEG.

That is, the inclined plate 210 of the swash plate 210 may be formed in the above-described angular range so that the swash plate 210 is inclined radially outwardly downward, It can be changed in the axial direction. Further, the flow rate and the static pressure indicated by the maximum efficiency value can be changed according to the dike angle of the swash plate, and the optimum operating point can be obtained by changing the operating point of the impeller, that is, the specific speed.

In addition, the side plate 400 may have a suction port 410 opened at an upper center portion thereof, and may be formed in a circular shape having an open upper center portion.

That is, the side plate 400 may be formed only in a region where the vanes 300 are formed in the radial direction, and may be formed as a suction hole 410 formed in a corrugated shape as shown and having an open upper central portion. The upper side of the fluid channel 310 is inclined by the side plate 400 and the lower side of the fluid channel 310 is inclined by the inclined plate 210 so that the side plate 400 and the inclined plate 210 are inclined. The fluid that is sucked into the suction port 410 may be smoothly discharged to the discharge port 320 and may not be peeled off from the fluid channel 310.

At this time, the side plate 400 may be formed to be parallel to the swash plate 210, may be inclined at different angles, or may be formed at various angles. The vane 300 is formed to protrude in the vertical direction from the swash plate 210 and the inner and outer ends of the vane 300 in the radial direction are formed in a shape perpendicular to the damping angle? So that the inner end and the outer end of the vane 300 can be formed to be inclined in the radially outward upward direction. So that a greater amount of fluid can be introduced into the inlet 410.

The inclined plate 210 of the inclined plate 210 is formed in the above-mentioned angular range so that the flow of the fluid is made circular so that the fluid introduced into the inlet port 410 of the side plate 400 is separated from the fluid channel 310 Vortex) phenomenon may not occur.

The collar 300 may be formed by setting a line connecting the inner end A and the outer end B as a straight line to a chord line 301 of the vowel 300, The curvature of the feather 300 can be set by specifying the relative height of the airfoil average camber line to the airfoil.

That is, a line connecting the inner end portion A corresponding to the leading edge and the outer edge portion B corresponding to the trailing edge becomes the code line 301 of the vest 300 and the code line 301 A curved line connecting the average camber line of the airfoil may be a cross-sectional shape of the collar 300. Thus, since the shape of the average camber line varies depending on the shape of the airfoil, the collar can be formed to have various cross-sectional shapes according to the shape of the airfoil to be applied.

The inclined reference angle 1 of the collar 300 is inclined toward the opposite direction of the wind from the inner end A to the outer end B corresponding to the trailing portion, And is formed in a bent shape toward the rotation direction from the inner end portion A to the outer end portion B and is convex in the opposite direction of rotation) or the entire inverted portion (corresponding to the trailing portion from the inner end portion A) And is bent toward the rotational direction from the inner end A to the outer end B to form a convex shape in the opposite direction to the rotation direction And the length, curved shape, entrance pupil 1 and exit pupil 2 of the vampire 300 may vary depending on the attached reference angle? 1 and the shape of the average camber line to be applied.

That is, the vanes 300 are formed in a full-bodied form, and the inner ends A of the vanes 300 at the inner ends A of the vanes 300 and the cord lines 301 of the vests 300 are connected to the An engraving reference angle? 1 formed by the tangent line L2 with respect to the inner diameter Di, which is a diameter, can be formed to be 10 to 120 degrees. As the fiducial reference angle? 1 increases, the length of the vanes 300 and the cord length change. As the attachment reference angle? 1 becomes larger, the entrance pupil angle? 1 and the exit pupil angle? 2 become larger and the entrance pupil angle? 1 and the exit pupil angle? 2 become smaller as the attachment reference angle? 1 becomes smaller . Wherein inlet flange 1 has a tangent line to inner diameter Di which is the diameter of a circle connecting the tangent line L1 to the collar 300 at the inner end A of the collar and the inner end A of the collar, L2 is an angle formed by the outer diameter of the circle connecting the tangential line L4 to the vane 300 at the outer end B of the vane and the outer ends B of the vane, ) Of the tangent line L3 with respect to the tangential line L3.

In the present invention, an entire camber line mixing impeller 1000 having an average camber line shape is installed in a duct 500 so that fluid discharged through a discharge port 320 of the fluid channel 310 flows into the duct 500, In the axial direction. That is, as shown in the drawing, the mixed impeller 1000 is installed in an in-line duct 500 formed in a straight line shape, and the flow direction of the fluid in the main flow direction of the fluid in the duct 500 and the discharge direction The mixed impeller 1000 may be configured to be arranged in parallel with the rotating shaft of the fluid in the flow direction so as to be constituted by an in-line duct-fan, The fluid flowing in the direction of the rotating shaft 100 of the mixed impeller 1000 is sucked into the suction port 410 and is discharged to the discharge port 320 through the fluid flow paths 310 so that the swirling angle θ of the swash plate 210, So that it can be discharged in a direction parallel to the rotating shaft 100 along the duct 500 after being sloped against the wall surface of the duct 500. As the fluid flows in the radial direction of the mixed impeller 1000, the flow of the fluid in the direction of the rotation axis reduces the energy loss due to the collision at the wall surface of the duct 500, thereby reducing the efficiency of the inline duct blower.

In addition, in the present invention, an all-blade mixed impeller 1000 having an average camber line-shaped cross section is formed so that fluid discharged from the discharge port 320 flows in the axial direction and flows into an axial flow type blower or a flow- ). That is, the flow of the fluid discharged from the discharge port 320 can be formed substantially parallel to the main flow direction of the fluid in the duct 500, thereby greatly reducing the loss due to energy dissipation in the wall surface inside the duct 500 The efficiency of the blower can be greatly improved when applied to an axial flow type flow fan or a flow-through type blower. As shown in FIGS. 7 and 8, the present invention improves the static pressure according to the amount of air and increases the efficiency according to the amount of air compared to the conventional mixed impeller.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It goes without saying that various modifications can be made.

1000: Whole-grain mixed impeller with average camber line shaped cross section
100:
200: abacus 210: swash plate
300: colander 301: code line
310: fluid channel 320: discharge port
400: side plate 410: inlet
500: Duct
C: Reference point θ:
A: Inner end of the feather B: Outer end of the feather
L: center line
β1: entrance pinch β2: exit pinch
θ1: Reference standard angle
Di: Diameter (inner diameter) of the circle connecting the inner ends A of the feathers.
Do: The diameter of the circle connecting the outer ends B of the feathers (outer diameter)
L1: Tangent to the collar at point A
L2: Tangent to inner diameter Di at point A
L3: Tangent to outer diameter Do at point B
L4: Tangent to the collar at point B

Claims (7)

The swash plate 210 is fixed to the center of the rotating shaft 100 and rotates around the rotating shaft 100. The swash plate 210 having a radially outer circumferential portion inclined at an acute angle? An abacus plate 200 including;
A plurality of feathers 300 installed on the swash plate 210 of the main plate 200 and spaced apart from each other in the circumferential direction; And
A side plate 400 disposed opposite to the swash plate 210 and coupled with the vests 300; , ≪ / RTI >
The collar 300 is formed as an angled cheek bent in the rotational direction of the main plate 200. The collar 300 is formed to have an average camber line cross section of the airfoil,
The vanes 300 protrude in a direction perpendicular to the swash plate 210 and a side plate 400 is coupled to the upper side of the vases 300. The swash plate 210, the side plate 400, And a discharge port 320 is formed at one side of the fluid channel 310,
The inclined angle &thetas; of the swash plate 210 is set to 10 DEG to 50 DEG,
The side plate 400 is formed with a suction port 410 opened at the center of the upper side,
The collar 300 may be formed by setting a line connecting the inner end A and the outer end B as a straight line to a chord line 301 of the vowel 300, The curve of the feather 300 is set by designating the relative height of the airfoil average camber line,
The inclination reference angle? 1 of the collar 300 is formed to be a whole backward inclination angle of 10 ° to 120 ° and a total inclination angle of the backward inclination angle? 1, and the length of the vestibule 300 according to the attached reference angle? , A curved shape, an inlet feather angle (? 1) and an outlet feather angle (? 2) are changed and used for a blower or a pump.
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