KR101645209B1 - Centrifugal impeller having airfoil suction surface type backward twisted blades - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a twisted-leaf centrifugal impeller having a suction surface of a backward airfoil, and more particularly, Since the attachment angle and the side angle of the side plate are different from each other and are formed as twisted fingers, the pressure and air volume generated are increased and the performance is improved. The direct coupling type is employed to provide a simple structure and high power transmission efficiency. It is possible to reduce impeller manufacturing cost and time due to strong impeller structure due to embossing effect of feather section and fewer number of floats. By adopting direct coupling type, it is possible to manufacture blower There are features that can save cost and time.

Description

{Centrifugal impeller having airfoil suction surface type backward twisted blades}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a twisted-leaf centrifugal impeller having a suction surface of a backward airfoil, and more particularly, Since the attachment angle and the side angle of the side plate are different from each other and are formed as twisted fingers, the pressure and air volume generated are increased and the performance is improved. The direct coupling type is employed to provide a simple structure and high power transmission efficiency. It is possible to reduce impeller manufacturing cost and time due to strong impeller structure due to embossing effect of feather section and fewer number of floats. By adopting direct coupling type, it is possible to manufacture blower The present invention relates to a twisted vane centrifugal impeller having a rear bend airfoil suction surface shape that can save cost and time.

Generally, an impeller is a main part of a pump, a blower or a compressor. The impeller is rotated with several pulleys arranged at equal intervals on a circumference, and a gas or fluid such as air, water or oil is connected to a shaft Energy is created when flowing through the feathers.

Normally, the feathers are divided into a centrifugal type and an axial flow type, and the centrifugal type feathers flow perpendicularly to the axis of rotation of the fluid or gas, and the axial flow of the fluid or gas flows in the direction of the rotation axis.

Here, the centrifugal impeller generates pressure while air is radially conveyed. Generally, as shown in Fig. 1, a backward-feather centrifugal impeller 50 having an exit feather angle [beta] 2 smaller than 90 [deg.] Is used most frequently, Centrifugal impellers are divided into a backward curve vane centrifugal impeller and a backward straight vane centrifugal impeller.

The backward curved vane centrifugal impeller is a centrifugal impeller consisting of a vane having an impeller vane tilted backward with respect to the direction of rotation and having a convex surface in the form of a simple arc with respect to the direction of rotation:

The backward straight vane centrifugal impeller is a centrifugal impeller composed of a vane having an impeller vane tilted backward with respect to the rotational direction and having a flat plate surface with respect to the rotational direction,

The backward curve vane centrifugal impeller (a) is known to have superior efficiency and performance as compared to the backward straight vane centrifugal impeller (b).

The shape of the arc of the backward curved feather is determined by the outer diameter D2 of the impeller outlet, the inner diameter D1 of the impeller inlet, the impeller inlet feather angle? 1 and the impeller outlet feather angle? 2, (D1 / D2). When the ratio is small, the arc becomes convex, and when the ratio is large, the arc is flattened close to the linear shape.

However, in the case of a backward curved centrifugal impeller used for air conditioning, since the diameter ratio (D1 / D2) is large, the arcuate shape of the feather is not kept convex, .

Therefore, centrifugal impellers (a) and (b) with a backward feather are disadvantageous in that they are difficult to use in the case of a centrifugal blower for air conditioning, which requires a large amount of air, and therefore the forward and backward centrifugal impellers .

However, the forward full-throttle centrifugal impeller has a large non-velocity due to the large amount of air generated compared to the generated pressure, the efficiency is low, and the number of rotations of the impeller is small. The efficiency is low, and surging phenomenon occurs in a low air volume region.

Here, the surging phenomenon may cause the impeller to vibrate, resulting in the breakage of the rotating shaft.

Korean Patent Publication No. 10-2005-0074360 Korean Utility Model Registration No. 20-0241247

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems,

A cross section of a collet attached to the main plate is formed in the form of an airfoil suction surface in the form of an airfoil suction surface and then formed in a twisted shape in the future to thereby smoothly induce a flow in a tangential direction at a centrifugal impeller inlet having a conventional backward feather, It is possible to reduce the impact loss at the inlet of the impeller, improve the flow characteristics in the jet passageway, and increase the pressure and air volume to be generated, thereby improving the noise performance and preventing the surging phenomenon in the low- , Reducing the manufacturing cost and time of the impeller due to the small number of floats, and reducing the manufacturing cost and time by adopting the direct-coupling type and simplifying the power transmission device. Rear bend airfoil The suction surface of the twisted vane centrifugal impeller The purpose is to provide.

In addition, since the embossing effect of the feather section is stronger than that of the conventional backward feather, the impeller structure is strong and the high speed rotation is possible, and the additional cost and time due to the production of the centrifugal impeller are not added, Another object of the present invention is to provide a twisted vane centrifugal impeller having a rear bend airfoil suction surface shape that can reduce the manufacturing cost and time of the centrifugal blower by simplifying the apparatus.

In order to accomplish the above object, the present invention provides a rotary compressor comprising: a rotary shaft to which a rotary force is transmitted;

A main plate fixed to the central portion of the rotation shaft and rotated about a rotation axis;

A plurality of circumferentially spaced apart circumferential margins are attached to the circumferential edge of the main plate and the fluid is transferred to one side while rotating the main plate and the cross section of the collar is formed into a curve shape in the shape of an airfoil suction surface, A rear bending airfoil having a suction surface shape bent in a rotating direction of the main plate;

And a side plate formed on an upper surface of the torsion barriers (30) of the rear bent airfoil suction surface and having a suction port to allow fluid to flow in the central portion thereof. The present invention relates to a torsional vane centrifugal impeller.

As described above, in the torsion vane centrifugal impeller of the backward bending airfoil suction surface shape of the present invention, the cross section of the vanes provided between the main plate and the side plate is formed in the shape of a backward all groove of the airfoil suction surface shape, Since the angle between the angle and the side plate is different from each other and is formed as a twisted fence, the pressure and air volume generated are increased and the performance is improved. The direct coupling type structure is employed to simplify the structure and power transmission efficiency. There is an effect that the phenomenon does not occur.

In addition, due to the embossing effect of the feather section, the impeller structure is strong and the number of floats is small, which can save the cost and time of impeller manufacturing. By adopting the direct coupling type, the power transmission device is simplified, There is an effect that can be done.

1 is a plan view of a conventional backward curved vane centrifugal impeller and a backward vane centrifugal impeller,
2 is a perspective view showing a conventional backward curve vane centrifugal impeller and a backward straight vane centrifugal impeller,
FIG. 3 is a plan view of a torsionally vane centrifugal impeller having a suction surface shape of a rear bending airfoil according to a first embodiment of the present invention,
FIG. 4 is an enlarged view of a torsional vane centrifugal impeller having a suction surface shape of a rear bending airfoil according to the first embodiment of the present invention,
FIG. 5 is a perspective view showing a torsional vane centrifugal impeller having a suction surface shape of a rear bending airfoil according to the first embodiment of the present invention,
FIG. 6 is a plan view of a torsional vane centrifugal impeller having a suction surface shape of a rear bending airfoil according to a second embodiment of the present invention,
FIG. 7 is a perspective view showing a torsional vane centrifugal impeller having a suction surface shape of a rear bending airfoil according to a second embodiment of the present invention,
FIG. 8 is a graph showing the pressure coefficient of a torsionally vane centrifugal impeller having a suction surface shape of a rear bend airfoil according to an embodiment of the present invention,
FIG. 9 is a graph showing the efficiency of a torsionally vane centrifugal impeller having a suction shape of a rear bend airfoil according to an embodiment of the present invention.

The present invention has the following features in order to achieve the above object.

The present invention relates to a rotary shaft,

A main plate fixed to the central portion of the rotation shaft and rotated about a rotation axis;

A plurality of circumferentially spaced apart circumferential margins are attached to the circumferential edge of the main plate, and the fluid is transferred to one side while rotating the main plate, and the collar is formed into a curved shape having an airfoil suction surface shape, A rear bending airfoil having a suction surface shape bent in a rotation direction of the airfoil;

And a side plate formed on an upper surface of the torsion bar 30 having the suction surface shape of the rear bending airfoil and having a suction port for allowing the fluid to flow in the center portion thereof.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing in detail several embodiments of the present invention with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the details of construction and the arrangement of components shown in the following detailed description or illustrated in the drawings will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral," and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 3 is a plan view of a torsionally vane centrifugal impeller having a suction surface shape of a rear bending airfoil according to a first embodiment of the present invention, and FIG. 4 is a plan view of a twisted airfoil suction surface of a rear bending airfoil suction surface shape according to the first embodiment of the present invention. FIG. 5 is a perspective view showing a torsional vane centrifugal impeller having a suction surface shape of a rear bend airfoil according to a first embodiment of the present invention, and FIG. 6 is a perspective view showing a twist vane centrifugal impeller according to a second embodiment of the present invention. FIG. 7 is a perspective view showing a torsional vane centrifugal impeller having a suction shape of a rear bend airfoil according to a second embodiment of the present invention, and FIG. 8 is a perspective view showing a twist vane centrifugal impeller according to a second embodiment of the present invention. FIG. 9 is a graph showing the pressure coefficient of a torsionally vortex centrifugal impeller having a suction surface shape of a rear bending airfoil according to an embodiment of the present invention. Fig. 8 is a graph showing the efficiency of a torsional vane centrifugal impeller having an apoil suction surface. Fig.

3 to 5 and Figs. 8 to 9, the torsion vane centrifugal impeller of the present invention has a rotating shaft 10, a main plate 20, a collar 30, And a side plate 40.

3 to 4, one end of the rotation shaft 10 is fixed to a central portion of the main plate 20, and the other end is a shaft provided inside the device such as a casing for transmitting a rotation force, The other side of the casing 10 protrudes from the inside of the cabinet to the outside and is connected to a rotating device (not shown) such as a motor and is rotated by the rotating device to transmit rotational force to the main plate 20.

3 to 5, the main plate 20 is formed of a circular flat plate, and a rotary shaft 10 is fixed to the center of the lower end surface, and is rotated about the rotary shaft 10. As shown in FIG.

3 to 5, a plurality of the vanes 30 are attached to the outer circumferential edge of the main plate 20 in a circumferential direction and are spaced apart from each other. The main plate 20 is rotated while the backward airfoil suction surface And the fluid is transferred to one side by the twisted collar 30 of the shape.

4, a longitudinal longitudinal section of the vane 30 is formed in a curved shape of an airfoil suction surface shape, and a curved surface is formed in a rotating direction. At this time, the vane 30 has a curved surface, A center line L is formed around the rotating shaft 10 and is formed to be inclined backward in the rotational direction of the main plate with respect to the center line L. [

The tilting vane 30 having the suction shape of the backward airfoil has an inner end point A connected to the inner side of the main plate 20 and an outer end point B connected to the edge of the main plate 20 And an outer end point B 'connected to an edge of the side plate 40 are formed. The inner end point A' is connected to the inner side of the side plate 40, and the outer end point B '

4, the lower end of the twist vat 30 having the suction surface shape of the rear bending airfoil is selected as the reference angle? 1 of the main plate 20 and the points A and B are set as the abacus side setting line L1 And a curved shape of the airfoil suction surface is applied on the main plate side setting line L1 to determine the shape of the curved shape of the collar, thereby setting various curved collar shapes.

The tangential line C is formed at the inner end point A and A 'of the torsion bar 30 having the suction surface shape of the backward bending airfoil at the center point, 1, and the length of the abacus-side set line L1 is formed to be longer or shorter by changing between the reference angle? 1 and the reference angle? 1 between 0 and 90 degrees, The side exit pupil? 22 and the main plate side entrance pupil? 12 are changed.

4, the inner end point A 'of the upper end portion and the outer end point B' of the upper end portion are connected to the side plate side setting line L2, The curve of the feather is set by applying a call to the side setting line L1 and the side plate side setting line L2.

That is, the side plate side setting line L2 is formed such that the tangent line C is formed at the inner end point A, A 'of the twist vane 30 having the suction surface shape of the back bent airfoil at the center point, 2, and the side plate side attachment reference angle 2 is varied between 0 and 90 degrees to form a longer or shorter length of the side plate side setting line L2, The side exit pupil 21 and the side plate entrance pupil 11 change.

The inner end point A of the lower end portion and the inner end point A 'of the upper end portion are formed at the same position in a vertical line on the vertical direction and the outer end point B' of the upper end portion of the twisted vane 30, Is formed at a position farther from the outer end point (B) of the lower end in the arc direction of the feathers so that the shape of the feathers is formed to be bitten. That is, the outer end point B 'is formed to be bent in the rotational direction of the main plate 20 opposite to the curved line.

As shown in FIGS. 3 to 5, the side plate 40 is formed as a circular plate having a suction port 41 to allow fluid to flow in a central portion thereof. The suction port 41 is formed in a generally donut- (Not shown) is formed between the vanes 30 and the vanes 30 to thereby form a fluid passage (not shown).

4, the side plate 40 is provided on the upper surface of the collar 30. The side plate 40 is formed to be inclined in the shape of "? &Quot;

As shown in Figs. 6 to 9, the torsion vane centrifugal impeller of the present invention has a configuration, a structure, a function, and the like of the first embodiment described above as the second embodiment . However, the shape of the vanes 30 is different from that of the first embodiment and will be described below.

As shown in FIGS. 6 to 7, the inner end point A of the lower end portion and the inner end point A 'of the upper end portion are formed at the same position in a vertical line on the vertical direction, The outer end B 'of the upper end portion is formed in the same direction as the arc direction of the collar, that is, in a direction opposite to the rotation direction of the collar, so that the shape of the collar is formed to be bitten.

That is, the outer end point B 'is located farther from the outer end point B than the position of the outer end point B so that the shape of the torsion bar 30 is bent.

10: rotating shaft 20: abacus
30: rear bending airfoil suction surface twist vane 40: side plate
41: inlet port 50: centrifugal impeller

Claims (8)

A rotating shaft 10 to which rotational force is transmitted;
A main plate 20 fixed to the central portion of the rotary shaft 10 and rotated around the rotary shaft 10;
A plurality of circumferentially spaced apart circumferential edges of the main plate 20 are spaced apart from each other and the fluid is transferred to one side by the rotation of the main plate 20. The lengthwise longitudinal cross- A tilting collar (30) having a shape of a backward airfoil suction surface formed at an upper side of the outer side to be bent in a rotating direction of the main plate (20);
And a side plate (40) formed on an upper surface of the torsion bar (30) of the back bent airfoil suction surface and having a suction port (41)
The tilting vanes 30 of the suction shape of the rear bending airfoil have a center line L about the rotation axis 10 of the main plate 20 and are provided on the opposite sides of the center line L, Wherein the airfoil is formed by inclining to a backward direction that is the direction of the airfoil.
delete The airfoil according to claim 1, wherein the rear bent airfoil suction surface-shaped torsion bar (30)
An inner end point A connected to the inside of the main plate 20 at the lower end portion and an outer end point B connected to the edge of the main plate 20 are formed,
And an outer end point (B ') connected to an edge of the side plate (40) is formed on the inner surface of the side plate (40) Centrifugal impeller.
The method of claim 3,
The tilting vanes 30 of the rearward bending airfoil suction surface shape are formed by connecting the inner end point A and the outer end point B of the lower end portion with the abacus side setting line L1 and the inner end point A ' Wherein a curved line of the feather is set by connecting the end point B 'to the side plate setting line L2 and applying a call to the main plate side setting line L1 and the side plate side setting line L2. Airfoil suction surface twisted vane centrifugal impeller.
5. The method of claim 4,
The inner end point A of the lower end portion and the inner end point A 'of the upper end portion are formed at the same position in a vertical line on the vertical direction and the outer end point B' of the upper end portion of the twist vat 30, Is formed at a position farther from the outer end point (B) of the lower end in the arc direction of the collar, so that the shape of the collar is formed to be bitten.
6. The method of claim 5,
The main plate side setting line L1 is formed such that a tangent line C at a center point of the inner end points A and A 'of the twist vane 30 having the suction surface shape of the back bent airfoil is formed, Side reference line angle? 1 is varied between 0 占 and 90 占 and the length of the abacus-side set line L1 is formed to be longer or shorter than the main plate side reference line? 1, Wherein the frictional force? 22 and the main plate side inlet frictional angle? 12 vary.
6. The method of claim 5,
The side plate side setting line L2 is formed such that a tangent line C at the center point is formed on the inner end point A, A 'of the twist vane 30 having the suction surface shape of the back bent airfoil, 2, the side plate side attachment reference angle 2 is varied between 0 and 90 degrees, and the side plate side setting line L2 is formed to be longer or shorter than the side plate side setting reference angle [theta] 2, (21) and the side plate side entrance feather angle (? 11) are changed. The rear deflection airfoil suction surface shape torsion vane centrifugal impeller
5. The method of claim 4,
The inner end point A of the lower end portion and the inner end point A 'of the upper end portion are formed at the same position in a vertical line on the vertical direction and the outer end point B' of the upper end portion of the twist vat 30, And is formed in a direction opposite to the arc direction of the feather so that the shape of the feather is formed to be biting.

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