KR101817956B1 - Impeller for a blower - Google Patents

Abstract

The present invention relates to an impeller for a blower, which is a sirocco fan as a basic form, and has an advantage of a limit load fan. The impeller for a blower comprises: a circular rotation plate which is rotated by a rotation shaft connected to an external motor; a circular side plate which is provided with an opening portion at the center portion thereof, and is positioned to face the rotation plate in parallel; a plurality of blades which are combined between the rotation plate and the side plate, and are disposed radially along the circumferential direction; and a hub which is combined to the center of the rotation plate to transfer power of the rotation shaft to the rotation plate. The blade has a cross-sectional shape in which two flat plates, that is an inner plate and outer plate, are bent at a bending point at an obtuse angle. The inner plate is formed to be shorter than the outer plate, and a thick curved rounded portion with a predetermined size is formed only at the outskirt of the outer plate.

Description

Impeller for a blower

The present invention relates to an impeller for a blower, which is constructed in a basic form as a Sirocco fan and also as an advantage of a limit load fan, wherein a plurality of blades are bent in a full- An inner plate and an outer plate are bent at an obtuse angle at a bending point and a rounded portion having a predetermined size is formed only at the outer periphery of the outer plate, And more particularly, to an impeller for a blower which is advantageous in terms of pressure and static pressure characteristics.

The blower consists of an impeller for generating the flow, and a casing for guiding the flow into and out of the impeller.

There are many ways to classify the blower. The most common method is classified by the characteristics of the flow through the impeller. It is divided into an axial-flow fan and a centrifugal fan.

If the flow of air occurs in a direction parallel to the axis of rotation of the impeller, it is called an axial flow fan. In this case, the flow directions of the inlet and outlet of the impeller coincide with the axis of rotation. Propeller type blowers, that is, ordinary home fans. Axial flow blowers are used where the applied energy is mainly used to increase the speed of the fluid, so that the flow is much needed but the pressure is not needed.

The centrifugal blower is mainly used for increasing the pressure by centrifugal force, and therefore it is used more frequently where the pressure is required rather than the flow rate.

The centrifugal type blower generally uses a tubular casing in which a helical casing is used so that the impeller inlet flow is in the direction of the rotation axis and the outlet flow is in the direction perpendicular to the rotation axis, and a case in which the tubular casing is used such that both the impeller inlet flow and the outlet flow are in the direction of the rotation axis. Respectively.

The centrifugal type blower is classified into a Sirocco fan, a limit load fan, a turbo fan, and a plate fan depending on the shape and the inclination of the blade.

The Sirocco Fan is an all-round type in which the end portion of the wing is curved in the rotating direction. Since the size of the blower can be reduced because the number of revolutions is much smaller than that of other types for the same capacity, it is suitable for the fan coil unit (FCU) It is used as duct blower,

The limit load fan is designed to overcome the problem of a multi-fan type fan that increases sharply as the air flow increases and becomes an overload. Since it has characteristics that do not rise, it is used for ventilation and air supply in factories or for low-speed duct air conditioning (medium-scale or higher).

1 is a partial cross-sectional view of a conventional limit rod type impeller. As shown in the figure, the blade 12 of the limit rod type impeller 10 has an S-shaped cross section, and an inflection point 14 formed between the outer end and the inner end of the blade 12 And is divided into an inner arc portion 16 and an outer arc portion 18 by reference. The center C1 of the radius of curvature of the outer circular arc portion 18 is located at the rear and the center C2 of the radius of curvature of the inner circular arc portion 16 is defined as C2 The blade 12 is formed so as to be positioned at the front side.

The limit rod type impeller 10 is advantageous in that the blade 12 has an "S" cross-sectional shape and a propeller-type guide collar is fixed to the casing inlet, have.

However, such a limit rod type impeller 10 is not widely utilized at present because of its complicated shape, which is not easy to manufacture and is expensive.

In addition, since the limit rod type impeller has a limited number of blades 12, the size and capacity of the motor must be increased as compared with other types of impellers in order to obtain the same air volume, resulting in a significant increase in manufacturing cost and maintenance cost .

Korea Intellectual Property Office Utility Model Registration No. 20-0276584 Korean Patent Office Patent Registration No. 10-0588806

In the conventional multi-blade fan, the blades are formed in the form of a full-bore arc, which has a problem in that it has a favorable structure in terms of air volume and inferior static pressure capability, In the present invention, since the blade has two flat plates, that is, an inner plate and an outer plate bent at an obtuse angle at a bending point,

The outer plate is formed to be longer than the inner plate and the outer round plate is formed only at the outer periphery of the outer plate so that both the blowing effect and the static pressure capability can be maintained at a satisfactory level The present invention has the object of the present invention.

That is, according to the present invention, a plurality of blades are formed in a full-bending shape bent in a rotational direction, but an inner plate and an outer plate are not formed in a circular arc shape, but are bent at an obtuse angle at a bending point And it is an object of the present invention to be able to satisfy the positive pressure characteristic while being advantageous in terms of air volume and noise by forming a rounded round portion of a predetermined size only on the outer side of the outer plate.

The above-

A circular rotary plate for rotating by a rotary shaft connected to an external motor; A circular side plate having an opening formed in its central portion and positioned so as to face parallel to the rotating plate; A blade coupled between the rotating plate and the side plate and radially arranged in a plurality of directions along the circumferential direction; And a hub coupled to the center of the turntable for transmitting the power of the rotation shaft to the turntable, the impeller for a blower comprising:

Wherein the inner plate is formed to be shorter than the outer plate and the inner plate is formed to have a predetermined size only at the outer periphery of the outer plate, Shaped portion is formed in the impeller for the blower.

The length ratio between the inner plate and the outer plate may be 1: 1 to 3,

A straight line passing through an inner end of the blade at a center CR of the rotary plate is defined as a normal line N and a rotation direction of the blade is defined as a forward direction and a direction opposite thereto is defined as a rear direction, The angle formed between the outer plate and the lower plate of the inner plate may be in the range of 3 to 20 ° and the angle formed by the line connecting the upper end of the outer plate and the lower plate of the inner plate may be 15 to 45 °.

The radius of curvature R may be in the range of 0.5 to 2 times the length of the inner plate.

The upper and lower ends of the blade are coupled to the side plate and the rotary plate, respectively. At least one protruding piece is formed on the upper and lower ends of the blade, and a through hole is formed in the side plate and the rotary plate, Therefore, the blade can be firmly coupled between the side plate and the rotary plate by bending the protruding piece through the through hole.

Further, it is preferable that the protruding pieces are formed on the inner plate and the outer plate, respectively, for balance of force.

The present invention relates to an impeller for a blower, which has a basic shape as a Sirocco fan and also has the advantage of a limit load fan, wherein a plurality of blades are bent in a rotational direction An inner plate and an outer plate are formed at an obtuse angle at a bending point without forming a round shape and a rounded round portion having a predetermined size is formed only at an outer periphery of the outer plate, And it is advantageous in terms of noise and satisfactory static pressure characteristics.

That is, in the conventional multi-blade fan, the blades are formed in the form of an arc of a full bending type. Such a structure has a problem in that it has a favorable structure in terms of air volume and low static pressure ability, In contrast, according to the present invention, since the blade has two flat plates, that is, the inner plate and the outer plate are bent at an obtuse angle at the bending point, there is no risk of damaging the blades due to no dust accumulation,

Since the outer plate is formed to be longer than the inner plate for blowing effect and the outer plate is formed with a rounded round portion only at the outer periphery thereof to compensate the static pressure capability, It is possible to solve the problem and obtain an excellent effect in terms of efficiency and noise.

1 is a partial cross-sectional view of a conventional limit rod type impeller.
2 is a perspective view of an impeller for a blower according to the present invention.
3 is a cross-sectional view of an impeller for a blower according to the present invention.
4 is an exploded perspective view of an impeller for a blower according to the present invention.
Fig. 5 is a front view and a plan view showing only a blade, which is a main part of the present invention, in an enlarged scale.
6 is a performance comparison chart of the impeller for a blower according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

The following description of the present invention is merely an example for structural or functional explanation. Accordingly, the scope of the present invention should not be construed as being limited by the embodiments described herein.

For example, it is to be understood that the embodiments may be variously modified and may take various forms, and thus the scope of the present invention includes equivalents capable of realizing technical ideas.

Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effects.

The meaning of the terms described in the present invention should be understood as follows.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 2 is a perspective view of an impeller for a blower according to the present invention, FIG. 3 is a cross-sectional view of an impeller for a blower according to the present invention, and FIG. 4 is an exploded perspective view of an impeller for a blower according to the present invention.

As shown in the figure, the impeller 100 for a blower includes a rotary plate 110, a side plate 120, a blade 130, and a hub 140,

The rotating plate 110 receives rotational force by a rotating shaft 150 connected to the hub 140 and rotates. A metal hub 140 is attached to the center of the rotating plate 110 by bolts, nuts, and the like And the hub 140 is fitted with a rotary shaft 150 connected to an external motor.

The side plate 120 is positioned to face the rotating plate 110 in parallel. An opening 125 is formed at the center of the side plate 120 to suck outside air or the like.

Between the rotary plate 110 and the side plate 120, a plurality of blades 130 are radially disposed along the circumferential direction.

The upper and lower ends of the blade 130 are coupled to the side plate 120 and the rotary plate 110 so that one or more protrusions 135 are formed on the upper and lower ends of the blade 130, Since the through holes 121 are formed in the rotary plate 120 and the rotary plate 110 at positions corresponding to the protruding pieces 135 so that the protruding pieces 135 are bent into the through holes 121, 130 are firmly coupled between the side plate 120 and the rotary plate 110.

5 is a front view and a plan view showing only a blade which is a main part of the present invention. Here, the blade 130 has two planar surfaces, that is, an inner plate 131 and an outer plate 134 The inner plate 131 is formed to have a shorter length than the outer plate 134 and only the outer circumferential portion of the outer plate 134 has a predetermined rounded portion 134 ).

The protruding pieces 135 are preferably formed on the inner plate 131 and the outer plate 134 for balance of force and correspond to the protruding pieces 135 on the side plate 120 and the rotary plate 110, A through hole 121 should be formed in each of the through holes 121.

In the conventional multi-blade fan, the blades are formed in the form of a full-bore arc, which has a problem in that it has a favorable structure in terms of air volume and inferior static pressure capability,

In the present invention, since the blade has two flat plates, that is, the inner plate 131 and the outer plate 134 are bent at an obtuse angle at the bending point 133,

There is no risk of damaging the blades due to no dust accumulation, and the outer plate 134 is formed longer than the inner plate 131 for blowing effect,

In the outer plate 134, a rounded round portion 134 is formed only at the outer periphery of the outer plate 134 to complement the static pressure capability.

With such a configuration, when the air volume increases, the problem that the shaft force increases and becomes an overload can be solved, and the efficiency and noise are also excellent.

When the outer plate 134 is shorter than the inner plate 131, the sirocco effect is lowered so that the supply of the air flow rate is sufficient. And the outer plate 134 is three times longer than the inner plate 131, there is a problem that the static pressure capability is deteriorated.

A straight line passing through the inner end of the blade 130 from the center CR of the rotary plate 110 is defined as a normal line N and the direction of rotation of the blade 130 is referred to as forward An angle formed between the inner plate 134 and the normal line should be 3 to 20 degrees and a line connecting the upper end of the outer plate 134 and the lower end of the inner plate 131 The normal angle should be between 15 and 45 °.

If this range is exceeded, there is a problem that the supply of air volume is considerably lowered and the noise is increased or the static pressure capability is lowered. Therefore, it is desirable to set it within the above range.

In the meantime, in the present invention, the outer plate 134 is formed with a rounded round portion 134 only at the outer periphery thereof to complement the static pressure capability.

6, the round portion 134 is formed in a rear type in which the center of the radius of curvature R is located rearward. The radius of curvature R is 0.5 to 2 times the length of the inner plate 131 Range.

Since the outer plate 134 contributes mainly to the supply of the air volume and the round section 134 forms a back pressure to contribute to the improvement of the static pressure capability, If the length is twice or more of the length, the area where the outer plate 132 is pointed is too small to significantly reduce the air supply efficiency.

When the radius of curvature R is less than 0.5 times the length of the inner plate 131, there is a problem that the area of the round portion 134 is too small and the static pressure capability is remarkably deteriorated.

In the illustrated embodiment, the angle formed by the normal to the inner plate 134 is 7 °, the angle formed by the line connecting the upper end of the outer plate 134 to the lower end of the inner plate 131 and the normal is 25 °, The length ratio between the inner plate 134 and the outer plate 134 is 1: 1.8 and the radius of curvature R of the round portion is 0.76 times the length of the inner plate 131,

6 is a performance comparison chart of the blower impeller thus configured,

It has been confirmed that the blower impeller according to the present invention has greatly improved both the air flow rate supply capability and the static pressure capability.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. It is therefore intended that such modifications or alterations be within the scope of the claims appended hereto.

100: impeller 110: spindle
111, 121: through hole 120: side plate
130: Blade 131: Inner plate
132: Outer plate 133: Bending point
134: Round section 135:
140: hub 150:

Claims (6)

A circular rotary plate for rotating by a rotary shaft connected to an external motor; A circular side plate having an opening formed in its central portion and positioned so as to face parallel to the rotating plate; A blade coupled between the rotating plate and the side plate and radially arranged in a plurality of directions along the circumferential direction; And a hub coupled to the center of the turntable for transmitting the power of the rotation shaft to the turntable, the impeller for a blower comprising:
The blade has a cross section of two flat plates, that is, an inner plate and an outer plate bent at an obtuse angle at a bending point,
A straight line passing through an inner end of the blade at a center CR of the rotary plate is defined as a normal line N and a rotation direction of the blade is defined as a forward direction and a direction opposite thereto is defined as a rear direction, Wherein the angle formed by the line connecting the upper end of the outer plate and the lower end of the inner plate is in a range of 15 to 45 degrees.
The method according to claim 1,
Wherein the inner plate is formed to be shorter than the outer plate, and a rounded round portion having a predetermined size is formed only at the outer periphery of the outer plate.
3. The method of claim 2,
Wherein the length ratio between the inner plate and the outer plate is 1: 1 to 3.
The method according to claim 2 or 3,
Wherein the round portion is configured as a rear type in which the center of the radius of curvature R is located at the rear, wherein the radius of curvature R is in the range of 0.5 to 2 times the inner plate length.
The method according to claim 2 or 3,
The upper and lower ends of the blade are coupled to the side plate and the rotary plate, respectively. At least one protruding piece is formed on the upper and lower ends of the blade, and a through hole is formed in the side plate and the rotary plate, So that the blade is firmly engaged between the side plate and the rotary plate by bending the protruding piece through the through hole.
6. The method of claim 5,
And the projecting pieces are formed on the inner plate and the outer plate, respectively, for balance of force.

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