CN1751184A - Axial blower with twin impellers - Google Patents

Abstract

The present invention provides an axial flow blower with a double impeller capable of generating a larger air amount and a higher static pressure than the conventional blower. The axial flow blower with double impellers has a first axial flow blower unit 1 and a second axial flow blower unit 3. The first axial flow blower unit 1 includes a first casing 5, a first impeller 7, and a plurality of webs that fix a first motor to the first casing 5. The second axial blower unit 3 includes a first casing, a first impeller, and a plurality of webs that fix the second motor to the second casing. The first and second housings are coupled together to form a housing 59. The web of the first axial flow blower unit 1 and the web of the axial flow blower unit 1 are joined together to form a plurality of fixed webs arranged in the housing 59. The number of front blades 28 provided at the first impeller 7 is set to five, the number of stationary blades is set to three, and the number of rear blades 51 provided at the second impeller 35 is set to four.

Description

Axial blower with twin impellers

technical field

The present invention relates to an axial blower for cooling the inside of an electric appliance with double impellers rotating in opposite directions to each other.

Background technique

As the size of appliances gets smaller, the space inside the appliance housing in which air flows becomes smaller and smaller. To cool the inside of a small case, a blower characterized by a large volume of air and a high static pressure is required. In recent years, an axial blower having double impellers rotating in opposite directions to each other has been used as a blower having such a feature.

For example, U.S. Patent No. 6,244,818 and Japanese Patent Laid-Open Publication No. 2000-257597 show a blower comprising: a first axial blower unit having a first impeller with nine front blades; a second shaft A flow blower unit having a second impeller with nine trailing blades; and a casing having stator blades installed between the two axial flow blower units. By rotating the first impeller of the first axial blower unit and the second impeller of the second axial blower unit in opposite directions to each other, so as to discharge the air from the second axial blower unit Inhaled air, the blower can be modified into an axial flow blower with double impellers rotating in opposite directions to each other.

In recent years, certain applications have demanded higher performance than existing axial blowers having dual impellers rotating in opposite directions to each other.

In the blower described above, the first instance of the first axial blower unit is combined with the second instance of the second axial blower unit through a simple coupling structure. For example, a hook connected to one housing fits in a fitting groove in the other housing, and the two housings are rotated relative to each other so that the hook of one housing engages with the fitting groove of the other housing. However, with such an engaging structure, application of a force in a direction opposite to the direction in which the two housings are rotated for coupling can easily disengage the two housings.

An object of the present invention is to provide an axial blower having double impellers rotating in opposite directions to each other, which can generate a larger volume of air and a higher static pressure than conventional blowers.

Another object of the present invention is to provide an axial flow blower having double impellers rotating in opposite directions to each other, which has a reduced number of components compared to conventional blowers.

Still another object of the present invention is to provide an axial blower having double impellers rotating in opposite directions to each other, which generates less noise.

Still another object of the present invention is to provide an axial flow blower having double impellers rotating in opposite directions to each other, wherein if the first impeller of the first axial flow blower unit and the second impeller of the second axial flow blower unit The two impellers are subjected to a force acting in a direction opposite to the direction in which the two housings are rotated for coupling, they are not easily separated.

Contents of the invention

An axial blower having double impellers rotating in opposite directions to each other according to the present invention includes a housing, a first impeller, a first motor, a second impeller, a second motor, and a plurality of stator blades. The housing has an air passage with a suction port on one of its two shaft end sides and a discharge port on the other shaft end side thereof. The first impeller has a plurality of front blades rotating in the suction port. A first motor rotates the first impeller about an axis in one of two rotational directions. The second impeller has a plurality of trailing blades rotating in the discharge port. The second motor rotates the second impeller about an axis in another rotational direction opposite to the one direction. The stationary blades are fixed between the first impeller and the second impeller in the casing and extend radially. Here, the word "radial" applies not only to the case where the blades extend radially on a straight line, but also to the case where they extend radially on a curve.

An axial blower having double impellers rotating in opposite directions to each other according to the present invention includes five front blades, three stationary blades and four rear blades. The inventors of the present invention studied the relationship between the number of front blades, stationary blades and rear blades and the characteristics of the blower. It has been found that the above combination of the number of blades defined in the present invention produces a larger volume of air and a higher static pressure than other combinations of the number of blades. The combination of the number of blades described above also produces less noise than other combinations of the number of blades. Therefore, the axial blower having the double impellers rotating in opposite directions to each other according to the present invention can increase the air volume and static pressure, and reduce the noise, compared with the conventional blower.

Housings can be formed as a unitary structure or from two or more component parts. For example, when the axial flow blower having the double impellers rotating in opposite directions to each other according to the present invention is formed by combining two axial flow blower units, the casing is constructed by combining the casings of the two axial flow blower units .

When the first axial blower unit and the second axial blower unit are combined to form an axial blower having double impellers rotating in opposite directions to each other, the first axial blower unit includes a first housing, A first impeller, a first motor and three webs. The first housing has an air channel which has a suction opening on one of its two axial end sides and an outlet opening on its other axial end side. The first impeller has a plurality of front blades rotating in the suction port. A first motor rotates the first impeller about an axis in one of two rotational directions. Three webs are provided in the discharge port portion, spaced circumferentially, to secure the first motor to the first housing. Similarly, the second housing has an air channel with a suction opening on one of its two axial end sides and an outlet opening on its other axial end side. The second impeller has a plurality of trailing blades rotating in the discharge port. The second motor rotates the second impeller about an axis in another rotational direction opposite to the one direction. Three webs are provided in the suction port portion, spaced circumferentially, to secure the second motor to the second housing. In this case, the three webs of the first axial blower unit and the three webs of the second axial blower unit are preferably combined to form three radially extending stator blades, which The space between the first impeller and the second impeller is fixed. With this arrangement, there is no need to construct a casing having three stator blades separate from the axial blower unit, thereby reducing the number of parts used in the axial blower having double impellers rotating in opposite directions to each other.

More specifically, the front blade is curved in a cross-section of the front blade taken in a direction parallel to (or along) said axis so that its inner arc is directed towards the direction of rotation of the first impeller, i.e. in the Open in the one direction mentioned above. The trailing blade is curved in a cross-section of the leading blade taken in a direction parallel to said axis, so that its inner arc is open towards the direction of rotation of the second impeller, ie in said other direction as described above. In this configuration, the stationary vane is preferably curved in a cross-section of the front vane taken in a direction parallel to the shaft so that its inner arc is directed in the other direction (the direction of rotation of the second impeller) and toward the rear blade disposed therein. The direction opening of the blade. With this arrangement, it is possible to increase the maximum air volume and maximum static pressure, and reduce suction noise.

In one example, the first impeller may have an annular peripheral wall surrounding the axis of the base on which the five front blades are integrally mounted. The second impeller may have an annular peripheral wall surrounding the shaft of the base on which the four trailing blades are integrally mounted. This arrangement allows the first and second impellers to be easily formed by resin injection molding.

The rotational speed of the second impeller is preferably set slower than that of the first impeller in order to reduce noise.

Another axial blower having double impellers rotating in opposite directions to each other according to the present invention has a first axial blower unit and a second axial blower unit. The first axial blower unit includes: a first housing including an air passage having a suction port on one of its two shaft end sides and a discharge port on the other shaft end side thereof portion; and a first impeller having a plurality of blades adapted to rotate in the suction port portion. The second axial blower unit includes: a second housing including an air passage having a suction port on one of its two axial end sides and a discharge port on the other axial end side thereof portion; and a second impeller having a plurality of blades adapted to rotate in the discharge port portion. Next, the first casing of the first axial flow blower unit and the second casing of the second axial flow blower unit are combined through a coupling structure. In the present invention, the coupling structure includes: two kinds of engaged parts provided at the end around the outer periphery of the discharge port part of the first casing of the first axial flow blower unit; and two kinds of engaging parts provided around the second The two axial-flow blower units are located at the end of the outer periphery of the suction inlet portion of the second casing, and are adapted to be engaged with the two types of engaged portions. Next, the two types of engaging portions and the two types of engaged portions include: a first type of engaging portion and a first type of engaged portion, together forming a first type of engaging structure; and a second type of engaging portion and a second type of engaged portion , together forming the second meshing structure. The first engaging structure is adapted to: when the first shell and the second shell in the coupled state are subjected to a separation action for axially separating the first shell and the second shell, resist the separation action; and the second housing resists the first rotational operation when subjected to rotation of the first housing about the axis relative to the second housing in one of two rotational directions. The second engagement structure is adapted to resist the second housing when the first housing and the second housing in the coupled state are subjected to rotation of the first housing about an axis relative to the second housing in the other rotational direction opposite to the one direction. Rotation operation. With the above coupling structure including the first engaging structure and the second engaging structure of the present invention, when the first rotating operation of coupling the first housing to the second housing is performed, the first engaging structure resists the first rotating operation. When performing a second rotation operation of turning the first housing relative to the second housing in another rotation direction opposite to the one rotation direction, the second engagement structure resists the second rotation operation. Therefore, if the first axial flow blower unit and the second axial flow blower unit are subjected to a force acting in a direction (another direction) opposite to the direction in which they rotate for coupling, the second engagement structure can prevent this. Possible separation of the two blower units.

By bringing the end of the first housing and the end of the second housing closer together, the first engaging portion and the first engaged portion that together form the first engaging structure can be brought into a coupled state, and by Rotating the first housing with respect to the second housing on one of the shafts can make the second-type engaging portion and the second-type engaged portion, which together form the second-type engaging structure, enter a coupled state. This coupling arrangement allows the first housing and the second housing to be coupled together with a simple motion by using the first engagement structure.

The first engaging portion may be constituted by a hook having a first engaging surface and a second engaging surface. The first engaging surface is adapted to be engaged with the first engaged surface of the first type of engaged portion when the first housing and the second housing in the coupled state are subjected to a separation action for axially separating the two housings. When the first housing and the second housing in the coupled state are subjected to rotation of the first housing with respect to the second housing about the axis in the one direction, the second engaging surface is adapted to be engaged with the second engaged part of the first type. Meshing face meshing. The second type of engaging portion may be formed of a protrusion having a third engaging surface. When the first housing and the second housing in the coupled state are subjected to rotation of the first housing with respect to the second housing about an axis in the other direction, the third engaging surface is adapted to be engaged with the third engaged part of the second type. Meshing face meshing. The first type of engaged portion may be formed by a first fitting groove having first and second engaged surfaces. The second type of engaged portion may be formed by a second fitting groove having a third engaged surface. Constituting the engaging portion and the engaged portion as described above allows the first and second engaging structures to be formed in a simpler configuration.

In the example of the axial blower having the double impellers rotating in opposite directions to each other according to the present invention, the ends of the first housing and the second housing have almost rectangular profiles, and a first fitting groove and a The second fitting groove is formed in each of at least three of the four corners of the first housing. Furthermore, a hook and a protrusion are integrally provided at each of at least three of the four corners in the end of the second housing. The hook and the first engaging groove are formed such that a first engaging structure is formed. The first engagement structure is adapted to: when the first housing and the second housing in the combined state are subjected to a first rotation operation for rotating the first housing about an axis with respect to the second housing in one of two rotational directions, Resist the first spin operation. The protrusion and the second engaging groove are formed such that a second engaging structure is formed. Second engagement structure: the first housing and the second housing in the combined state are subjected to a second rotation operation for rotating the first housing with respect to the second housing about an axis in the other rotational direction opposite to the one rotational direction , resist the second rotation operation.

Description of drawings

FIG. 1 is an exploded perspective view of an axial blower having double impellers rotating in opposite directions to each other according to one embodiment of the present invention.

2 is a perspective view of a first casing of a first axial blower unit of the axial blower having double impellers rotating in opposite directions of each other of FIG. 1 .

FIG. 3 is a perspective view of a second casing of a second axial blower unit in the axial blower having double impellers rotating in opposite directions to each other of FIG. 1 .

FIG. 4 is an enlarged cross-sectional view illustrating a coupling structure of the axial blower of FIG. 1 having the double impellers rotating in opposite directions to each other.

5 is a cross-sectional view showing front blades, rear blades, and stationary blades taken along a direction parallel to the shaft of the axial flow fan of FIG. 1 having dual impellers rotating in opposite directions to each other.

Fig. 6 is a graph showing the relationship between the air volume and the static pressure of an axial blower having double impellers rotating in opposite directions to each other used in the test.

7A to 7F are cross-sectional views of stator blades in Examples 1 to 6 of the axial blower having the double impellers rotating in opposite directions to each other used in the test.

Fig. 8 is a graph showing the relationship between the air volume and the static pressure of an axial blower having double impellers rotating in opposite directions to each other used in the test.

FIG. 9 is a graph showing the relationship between the air volume and the static pressure of an axial blower having double impellers rotating in opposite directions to each other used in the test.

Detailed ways

Now, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of an axial blower having double impellers rotating in opposite directions to each other according to one embodiment of the present invention. As shown in the figure, an axial blower having double impellers rotating in opposite directions to each other has a first axial blower unit 1 and a second axial blower unit 3 coupled together by a coupling structure. FIG. 2 is a perspective view of the first axial blower unit 1 , and FIG. 3 is a perspective view of the second axial blower unit 3 .

The first axial blower unit 1 has a first housing 5, a first impeller (front impeller) 7 installed in the first housing 5, a first motor 25 shown in FIG. A web 19,21,23. In FIG. 1 , the first impeller (front impeller) 7 is shown in enlarged size. As shown in FIGS. 1 and 2 , the first housing 5 has an annular suction side flange 9 on one of both ends on the axis A (in the axial direction) and an annular discharge side flange on the other end. 11. The first housing 5 also has a cylindrical portion 13 between these two flanges 9 , 11 . The flanges 9 , 11 and the interior space in the cylindrical part 13 together form an air channel.

Fig. 2 is a perspective view of the first housing 5 of the first axial blower unit 1, as by making the second axial blower unit 3 the same as that of Fig. 1 with double impellers rotating in opposite directions to each other The first axial blower unit 1 of the blower is detached, seen from the joint between the first casing 5 and the second axial blower unit 3 . The suction side flange 9 has an almost rectangular outline in which an octagonal suction port portion 15 is formed. The suction side flange 9 has, at its four corners, flat surfaces 9 a facing the cylindrical portion 13 and through holes 9 b for mounting screws.

The discharge-side flange 11 also has an almost rectangular outline in which a circular discharge port portion 17 is formed. In the circular outlet section 17 three radially extending webs 19 , 21 , 23 are arranged equidistantly on the circumference. Via these three webs 19 , 21 , 23 the motor housing, in which the stator of the first electric motor 25 is fixed, is fastened to the first housing 5 . Of the three webs 19 , 21 , 23 , the web 19 has a groove-shaped recess 19 a that is open toward the second axial blower unit 3 . In said recess 19 a is installed a feeder wire, not shown, which is connected to the field winding of the first electric machine 25 . These three webs 19, 21, 23 are respectively combined with three webs 43, 45, 47 (described later) of the second axial flow blower unit 3 to form three stationary blades 61 (Fig. 5).

The first motor 25 includes: a rotor, not shown, to which the first impeller 7 of FIG. 1 is mounted; and a stator for rotating the rotor. The first motor 25 rotates the first impeller 7 in the suction port portion 15 of the first housing 5 in the counterclockwise direction in FIG. 1 (ie, in the direction of the arrow R1, or in one rotational direction). The first motor 25 rotates the first impeller 7 at a faster speed than the second impeller 35 described later. The first impeller 7 has: an annular member 27 fitted with an unillustrated cup-shaped member fastened as a rotor to an unillustrated rotating shaft of the first motor 25; and five front blades 28 integrally provided On the outer peripheral surface of the annular wall 27 a of the ring member 27 .

The discharge-side flange 11 has a flat face 11a formed facing the cylindrical portion 13 at each of the four corner portions 12A-12D. As shown in FIG. 2 , four first engaging grooves 29 constituting first-type engaged portions are formed at the four corner portions 12A- 12D. These first fitting grooves 29 are formed by through holes penetrating the discharge-side flange 11 . Here, the formation of these first fitting grooves 29 in the corner portion 12A will be explained. The first fitting groove 29 has a hook passing hole 29 a and a hook moving hole 29 b continuous with the hook passing hole 29 a. The hook passing hole 29a has a semicircular portion 29a1 which also serves as a through hole through which a mounting screw passes. The hook moving hole 29b is shaped like an arc. At the end 29c thereof when viewed in the rotation direction R1 of the first impeller 7, as shown in FIG. Two engaged surfaces 29e. FIG. 4 is a partial cross-sectional view of the corner portion 12A taken along a first fitting groove 29 and a second fitting groove 31 described later. The first engaged surface 29d is located at the corner portion 12A, and is formed by a portion of the flat end surface 11a ( FIG. 1 ) formed close to the end portion 29c of the hook moving hole 29b. The second engaged surface 29e is formed by an end surface on the rotation direction side of the hook moving hole 29b.

The three corner portions 12A, 12C, 12D are each formed with a second engaging groove 31 constituting a second type of engaged portion, except for a corner portion 12B near a web 19 where an electric wire not shown is installed. As shown in FIG. 4, the second fitting groove 31 has a protrusion moving groove 31a and an engagement groove 31b continuous with the protrusion moving groove 31a. The protrusion moving groove 31 a has an opening 31 c that opens toward the side surface of the discharge-side flange 11 . The protrusion moving groove 31 a has a bottom surface 31 d which is inclined so as to be close to the second axial blower unit 3 as it extends from the opening 31 c to the engagement groove 31 b. As a result, a step is formed between the engaging groove 31b and the protrusion moving groove 31a. The inner surface of the engaging groove 31b on the side of the protrusion moving groove 31a constitutes a third engaged surface 31e.

The second axial blower unit 3 has a second housing 33, a second impeller (rear impeller) 35 of FIG. 1 installed in the second housing 33, a second motor 49 of FIG. 3, and three webs of FIG. 43, 45, 47. In FIG. 1 , the second impeller (rear impeller) 35 is shown in enlarged size. As shown in FIGS. 1 and 3 , the second housing 33 has an annular suction-side flange 37 on one of both ends on the axis A (in the axial direction) and a discharge-side flange 39 on the other end. . The second housing 33 also has a cylindrical portion 41 between these two flanges 37 , 39 . The flanges 37, 39 and the interior space in the cylindrical portion 41 together form an air passage. Fig. 3 is a perspective view of the second housing 33 of the second axial blower unit 3, such as by making the first axial blower unit 1 the same as that of Fig. 1 with double impellers rotating in opposite directions to each other. The second axial blower unit 3 of the blower is separated, seen from the joint between the second housing 33 and the first axial blower unit 1 .

The suction side flange 37 has an almost rectangular outline in which a circular suction port portion 41 is formed. In the suction opening 41, three radially extending webs 43, 45, 47 are arranged equidistantly on the circumference. The second motor 49 is fastened to the second housing 33 by these three webs 43 , 45 , 47 . Of the three webs 43 , 45 , 47 , the web 43 has a groove-shaped recess 43 a that opens toward the first axial blower unit 1 . In said recess 43 a is installed a feeder wire, not shown, which is connected to an excitation winding of a second electric machine 49 . These three webs 43, 45, 47 are combined with the three webs 19, 21, 23 of the first axial blower unit 1 to form three stator blades 61 (FIG. 5) described later.

The second motor 49 includes: a rotor, not shown, to which the second impeller 35 of FIG. 1 is mounted; and a stator for rotating the rotor. The second motor 49 rotates the first impeller 57 in the discharge port portion 57 in the clockwise direction in FIG. Two impellers 35. As described above, the second impeller 35 rotates at a slower speed than the first impeller 7 .

The second impeller 35 has: a ring member 50 fitted with an unshown cup-shaped member fastened as a rotor to an unshown rotating shaft of the second motor 49; and four rear blades 51 integrally provided On the outer peripheral surface of the annular wall 50 a of the ring member 50 .

As shown in FIG. 3 , the four corner portions 36A- 36D of the suction side flange 37 are respectively formed with through holes 38 through which mounting screws pass. Each of the four corner portions 36A- 36D also has a hook 53 integrally formed therewith, which constitutes a first type of engaging portion. The hook 53 protrudes toward the first housing 5 . The configuration of the hook 53 at the corner portion 36A will be described. The hook 53 has a body portion 53a rising along the axis A from the corner portion and a head portion 53b connected at the front end of the body portion 53a. The head portion 53b at the front end of the body portion 53a protrudes outward gradually away from the axis A in the radial direction, thereby forming a step between the head portion 53b and the body portion 53a. The surface of the step forms a first engaging surface 53d that engages with the first engaged surface 29d. Except for the corner 36B near the web 43, each of the three corners 36A, 36C, 36D is integrally formed with a protrusion 55 constituting the second type of engagement so that the through hole 38 is located between the hook 53 and the protrusion 55 . Like the hook 53 , the projection 55 protrudes along the axis A toward the first housing 5 . The protrusion 55 has an inclined surface 55a that is inclined so as to approach the first housing 5 as it moves away from the hook 53 located in the same corner. The slope 55a slides on the slope forming the bottom surface 31d of the protrusion moving groove shown in FIG. 4 . The protrusion 55 has an end surface 55b extending from one end of the inclined surface 55a to the second housing 33 along the axis. The end surface 55b forms a third engaging surface that engages with a third engaged surface 31e formed in the engaging groove 31b.

The discharge-side flange 39 has an almost rectangular outline in which an octagonal discharge port portion 57 is formed. (The discharge port portion is located on the rear side in FIG. 3 , and its reference numerals are shown for convenience.) The discharge side flange 39 has one formed at each of the four corner portions on the columnar portion 41 side. flat end face 39a. The four corners are respectively formed with through holes 39b through which mounting screws pass.

In this blower example, the first casing 5 of the first axial blower unit 1 and the second casing 33 of the second circumferential blower unit 3 are combined as follows. First, make the end of the first shell 5 and the end face of the second shell 33 close together, and the heads 53b of the four hooks 53 of the second shell 33 are inserted into the corresponding hooks of the four first fitting grooves 29 in the first shell 5. through hole 29a. At the same time, the three protrusions 55 of the second housing 33 are fitted into the openings 31 c of the three second fitting grooves 31 in the first housing 5 . Next, as shown in FIGS. 2 and 3 , these housings 5 , 33 are turned clockwise in one direction (indicated by arrow D1 ) with respect to each other. This rotation is achieved either by rotating both housings, or by rotating only one housing with respect to the other. This rotation causes the body portion 53a of the hook 53 to move in the hook moving hole 29b of the first engaging groove 29 until the first engaging surface 53d of the head portion 53b of the hook 53 abuts against the first engaging surface 53d on the flat end surface 11a of the discharge side flange 11. On an engaged surface 11 , the second engaging surface 53 e of the body portion 53 a abuts against the second engaged surface 29 e of the discharge side flange 11 , thereby preventing the hook 53 from falling out of the first fitting groove 29 . And, the protrusions 55 move in the protrusion moving groove 31a of the second fitting groove 31 until they fit into the engaging groove 31b. The end surface 55b of the protrusion 55 is engaged with the third engaged surface 31e formed in the engaging groove 31b.

In the above embodiment, the hook 53 (the first type of engaging portion) and the first fitting groove 29 (the first type of engaged portion) are combined to form the first type of engaging structure. The protrusion 55 (the second type of engaging portion) is combined with the second matching groove 31 (the second type of engaged portion) to form the second type of engaging structure. With this structure, when the first housing 5 and the second housing 33 are no longer engaged with each other by the separation action of moving in the axial direction, the first engaging surface 53d of the head portion 53b of the hook 53 and the flat surface of the discharge side flange 11 The first engaged surface 29d on the end surface 11a is engaged, urging the first engaging structure to resist the separation action. And, when the first rotation operation is performed to rotate the first housing 5 and the second housing 33 in the coupled state around the axis A in one direction indicated by the arrow D1, the second engaging surface 53e of the body portion 53a is convexly aligned with the discharge side. The second engaged surface 29e of the rim 11 is engaged, causing the first engaging structure to resist the first rotational action. When the second rotation operation is performed to rotate the first housing 5 and the second housing 33 in the combined state around the axis A in a direction indicated by an arrow D2 opposite to the one direction (arrow D1), the third engagement is formed. The end surface of the surface protrusion 55 is engaged with the third engaged surface 31e of the engaging groove 31b of the second matching groove 31, so that the second engaging structure resists the second rotation action. Thus, in the blower of the present embodiment, even if the first housing 5 and the second housing 33 are subjected to a force acting in the direction of the arrow D1 or a force acting in the direction of the arrow D2, they are prevented from being separated.

As shown in Figure 1, in the air blower of this embodiment, the first shell 5 and the second shell 33 are combined to form a housing 59; and the webs 19, 21, 23 and the first axial flow blower unit 1 The webs 43, 45, 47 of the second axial flow blower unit 3 are joined together to form three radially extending stator blades 61 (FIG. 5), wherein the stator blades are positioned between the first impeller 7 and the The arrangement between the second impellers 35 is fixed. When the first impeller 7 rotates in one direction R1 and the second impeller 35 rotates in the other direction R2, air moves in the direction F from the suction port portion 15 to the discharge port portion 57 . FIG. 5 shows the front blade 28 , the rear blade 35 and the stationary blade 61 in a cross-sectional view taken in a direction parallel to the axis, where the first shell 5 and the second shell 33 are joined together. In the example shown in FIG. 5 , the stator blade 61 is formed by combining the web 3 of the first axial blower unit 1 and the web 47 of the second axial blower unit 3 . As shown in the figure, the front vane 28 is curved in cross section such that its inner arc opens toward R1, while the rear vane 51 is curved in cross section such that its inner arc opens in the other direction. The stator blade 61 is curved in a cross-sectional view, so that its inner arc portion opens toward another direction, and also opens toward the direction where the rear blade 51 is located.

A plurality of blowers having a structure similar to that of the present embodiment but differing in the number of front blades was manufactured, and by operating the blowers simultaneously, the relationship between the air volume and the static pressure in each of the blowers was examined. The second impellers of the blowers were turned at 67% of the speed of the first impellers. Fig. 6 shows the measurement results. In Fig. 6, the line marked ● represents the measurement result of the blower with five front blades, three stator blades and four rear blades in this embodiment; Measurements for a supply fan with three vanes and three trailing blades; a line marked with a + indicates a measurement for a supply fan with five leading vanes, three stationary vanes, and five trailing vanes; and a line marked with an x indicates Measurements on a blower with five forward blades, four stator blades and three rear blades. Fig. 6 shows the air volume and static pressure values of other blowers compared with these blowers (5-3-4) of this embodiment, where the air volume and static pressure of this embodiment are defined as Q and H, respectively. Fig. 6 shows that the blower with five front blades, three stator blades and four rear blades of this embodiment can generate larger air volume and better static pressure than other blowers.

Table 1 shows suction noise (dB(A)) and power consumption of each blower when the second impeller was rotated at 67% of the speed of the first impeller as in the experiment of FIG. 6 . In Table 1, the number of blades column shows the number of front blades, stationary blades and rear blades in sequence, and the column of suction noise (dB(A)) and power consumption shows the suction noise of the air blower (5-3-4) of this embodiment The value of Lp and power consumption P.

Table 1 number of blades suction noise power consumption 5-3-4 LP P 5-3-5 Lp+2 P×1.10 5-3-3 Lp+5 P×1.15 5-4-3 Lp±0 P×1.06

Next, a plurality of air blowers were produced in such a manner that the stator blades of the air blowers had a cross-sectional shape different from that of the present embodiment, but were otherwise similar in structure to the present embodiment. The current value, maximum air volume, maximum static pressure and suction noise are measured for each blower. Table 2 shows the measurement results. In Table 2, the blowers of Examples 1-6 for comparison have stator blades whose cross-sections are shown in FIGS. 7A-7F . More precisely, the stator blade of Example 1 ( FIG. 7A ) is curved in cross-section such that its inner arc is open in the direction R1 and in the direction where the forward blade 28 is located. The stator blade of Example 3 ( FIG. 7C ) is curved in cross-section so that its inner arc is open in the direction R2 and in the direction where the forward blade 28 is located. The stationary blade of Example 4 ( FIG. 7D ) is curved in cross-section so that its inner arc portion opens toward the direction R1 and toward the direction where the trailing blade 51 is located. The stator blades of Example 6 ( FIG. 7F ) have no inner arc, but are inclined so that they are close to the leading blade 28 as they extend in the direction R2. And, in Table 2, the first impeller rotational speed, the second impeller rotational speed, the current value, the maximum air volume, the static pressure, and the suction noise (dB(A)) represent corresponding values N1, Values of N2, I, Q, H, Lp.

Table 2 Rotational speed of the first impeller Second impeller rotation speed at present air volume static pressure Suction noise(dB(A)) Example N1 N2=N1×0.67 I Q h LP Example 1 N1×1.02 N2×1.07 I×0.98 Q×1.02 H×0.97 Lp+2 Example 2 N1×1.00 N2×1.00 I×1.00 Q×1.00 H×0.97 Lp±0 Example 3 N1×1.00 N2×1.11 I×0.97 Q×0.95 H×0.97 Lp+2 Example 4 N1×1.00 N2×1.06 I×0.98 Q×0.97 H×1.02 Lp+2 Example 5 N1×0.98 N2×1.11 I×0.98 Q×0.88 H×1.00 Lp+4 Example 6 N1×1.00 N2×0.97 I×1.02 Q×0.97 H×1.00 Lp+1

From Table 2, it can be deduced that, compared with those having stator blades with the cross-sections of Examples 1-6, by making appropriate adjustments to the rotation speed, the blower having the same cross-section as the present embodiment can produce more High maximum static pressure and less suction noise.

And, FIG. 8 shows the relationship between the air volume and static pressure of each blower when the blower of the present embodiment and the blowers of Examples 1-6 were operated under the same conditions as the test of Table 2. The air volume and static pressure shown in FIG. 8 represent the values of the corresponding values Q and H with respect to the blower (5-3-4) of the present embodiment. It can be seen from FIG. 8 that, compared with the blowers of Examples 1-6, the blower of this embodiment can generate larger air volume and higher static pressure.

Table 3 shows the current value, maximum air volume, maximum static pressure and suction noise of the blower of this embodiment and the blowers of Examples 1-6 when they operate at the same speed. FIG. 9 shows the relationship between the air volume and static pressure value of each blower when the blowers of the present embodiment and Examples 1-6 were operated under the same conditions as in the test of Table 3. FIG.

table 3 Rotational speed of the first impeller Second impeller rotation speed at present air volume static pressure Suction noise(dB(A)) Example N1 N2=N1×0.67 I Q h LP Example 1 N1×1.00 N2×1.00 I×0.87 Q×0.97 H×0.90 Lp+1 Example 2 N1×1.00 N2×1.00 I×1.00 Q×1.00 H×0.97 Lp+0 Example 3 N1×1.00 N2×1.00 I×0.85 Q×0.91 H×0.89 Lp+1 Example 4 N1×1.00 N2×1.00 I×0.92 Q×0.93 H×0.97 Lp+2 Example 5 N1×1.00 N2×1.00 I×0.88 Q×0.84 H×0.94 Lp+3 Example 6 N1×1.00 N2×1.00 I×1.07 Q×0.98 H×1.02 Lp+2

It can be deduced from FIG. 9 that the blower of this embodiment can generate a larger air volume and a higher static pressure than those blowers of Examples 1-6. It is also seen that although the blower of this example has almost the same air volume and static pressure as the blower of Example 6, the blower of Example 6 consumes a higher current and produces a greater suction than the blower of this example. noise.

Industrial applicability

With the present invention, by setting the number of front blades, stationary blades and rear blades to five, three and four respectively, it is possible to generate a larger air volume and static pressure than that obtained with a conventional blower and higher static pressure. It is also possible to achieve a reduction in noise. This provides better appliance cooling than conventional blowers.

And, when performing a first rotating operation to couple the first housing with the second housing, an engaging structure resists the first rotating action; When the first housing is rotated, the second engagement structure resists the second rotation action. Therefore, if the first axial flow blower unit and the second axial flow blower unit are subjected to a force acting in a direction opposite to that of the two blowers for coupling rotation, the second engagement structure prevents the two blowers from separate.

claims

(Amended in accordance with Article 19 of the Treaty)

1. An axial-flow blower with double impellers, comprising:

a housing having an air passage therein having a suction opening on one of its two axial end sides and a discharge opening on the other axial end side thereof;

a first impeller having a plurality of front blades rotating in the suction port, adapted to rotate in the suction port;

a first motor to rotate the first impeller about the axis of the blower in one of two rotational directions;

a second impeller having a plurality of trailing blades adapted to rotate in the discharge port;

a second motor to rotate the second impeller about the shaft in another rotational direction opposite to the one direction; and

a plurality of stator vanes extending radially and fixedly disposed between the first impeller and the second impeller in the housing;

Wherein the number of front blades is five, the number of stationary blades is three, and the number of rear blades is four.

2. The axial-flow blower with double impellers according to claim 1, wherein the front vane is curved in a cross-section of the front vane taken in a direction parallel to the shaft so that its inner arc is directed toward the opening in one direction;

wherein the trailing vane is curved in a cross-section of the trailing vane taken in a direction parallel to said axis such that its inner arc is open towards said other direction; and

Wherein the stator blade is curved in a cross-section of the stator blade taken in a direction parallel to the axis such that an inner arc portion thereof opens toward the other direction and toward the direction in which the trailing blade is disposed.

3. The axial flow blower with double impellers according to claim 2, wherein the first impeller has an annular outer peripheral wall surrounding the axis of the base on which the five front blades are integrally mounted; and

Wherein the second impeller may have an annular peripheral wall surrounding the axis of the base on which the four trailing blades are mounted integrally.

4. The axial blower with double impellers according to claim 3, wherein the rotation speed of the second impeller is slower than that of the first impeller.

5. An axial flow blower with double impellers, comprising:

A first axial flow blower unit comprising: a first casing including an air passage having a suction port on one of its two axial end sides and a discharge port on the other axial end side thereof an outlet portion; a first impeller having a plurality of front blades adapted to rotate in the suction portion; a first motor rotating the first impeller about the axis of the blower in one of two rotational directions; and a plurality of webs , spaced along the circumference, installed in the discharge port portion to fasten the first motor to the first housing; and

The second axial blower unit includes: a second casing including an air passage having a suction port on one of its two shaft end sides and a discharge port on the other shaft end side thereof. an outlet portion; a second impeller having a plurality of trailing blades adapted to rotate in the discharge outlet portion; a second motor rotating the second impeller about the shaft in another rotational direction opposite to the first direction; and a plurality of webs, circumferentially spaced apart, mounted in the suction port portion to secure the second motor to the second housing;

wherein the first housing of the first axial blower unit and the second housing of the second axial blower unit are coupled to form a housing;

wherein the plurality of webs of the first axial flow blower unit and the plurality of webs of the second axial flow blower unit are combined to form a plurality of fixedly disposed in the housing between the first impeller and the second impeller stationary blades; and

Wherein the number of front blades is five, the number of stationary blades is three, and the number of rear blades is four.

6. The axial-flow blower with double impellers according to claim 5, wherein the front vane is curved in a cross-section of the front vane taken in a direction parallel to the shaft so that its inner arc is directed toward the opening in one direction;

wherein the trailing vane is curved in a cross-section of the trailing vane taken in a direction parallel to said axis such that its inner arc is open towards said other direction; and

Wherein the stator blade is curved in a cross-section of the stator blade taken in a direction parallel to the axis such that an inner arc portion thereof opens toward the other direction and toward the direction in which the trailing blade is disposed.

7. The axial-flow blower with double impellers according to claim 6, wherein the first impeller has an annular outer peripheral wall surrounding an axis of a base on which five front blades are integrally mounted; and

Wherein the second impeller may have an annular peripheral wall surrounding the axis of the base on which the four trailing blades are mounted integrally.

8. The axial blower with double impellers according to claim 7, wherein the rotation speed of the second impeller is slower than that of the first impeller.

9. An axial flow blower with double impellers, comprising:

A first axial flow blower unit comprising: a first casing including an air passage having a suction port on one of its two axial end sides and a discharge port on the other axial end side thereof an outlet portion; a first impeller having a plurality of blades adapted to rotate in the suction portion; and

The second axial blower unit includes: a second casing including an air passage having a suction port on one of its two shaft end sides and a discharge port on the other shaft end side thereof. an outlet section; a second impeller having a plurality of blades adapted to rotate in the outlet section;

Wherein the first casing of the first axial flow blower unit and the second casing of the second axial flow blower unit are combined through a coupling structure;

Wherein the coupling structure includes: two kinds of engaged parts provided at the ends surrounding the outer circumference of the discharge port part of the first casing of the first axial flow blower unit; and two kinds of engaging parts provided around the second shaft at the end portion of the outer periphery of the suction port portion of the second casing of the flow type blower unit, and is adapted to be engaged with the two kinds of engaged portions;

Wherein the two kinds of engaging parts and the two kinds of engaged parts include:

The first type of engaging portion and the first type of engaged portion together form a first type of engagement structure, and the first type of engagement structure is suitable for axially separating the first shell when the first shell and the second shell are in the coupled state. When the separation operation of the second housing and the second housing is resisted, the first engagement structure is also suitable for the first housing and the second housing in the coupled state to be used to rotate around the shaft in one of the two rotation directions resisting the first rotational operation of the first housing when the first rotational operation is rotated with respect to the second housing; and

The second engaging portion and the second engaged portion together form a second engaging structure, and the second engaging structure is suitable for being subjected to an action in the one direction when the first shell and the second shell are in a coupled state. During the second rotation operation of rotating the first casing with respect to the second casing around the axis in the opposite rotation direction, the second rotation operation is resisted.

10. The axial-flow blower with double impellers according to claim 9, wherein the first engagement which together forms the first engagement structure is made by bringing the ends of the first housing and the second housing closer together. The part and the first engaged part are brought into the coupled state, and by rotating the first housing with respect to the second housing about the axis in the one direction, the second engaging part and the second engaging part which together form the second engaging structure can be made The engaged part enters the coupled state.

11. The axial-flow blower with double impellers according to claim 10, wherein the first type of engaging portion comprises: a hook having a first engaging surface and a second engaging surface, when the first housing in the coupled state When the second shell is subjected to a separation operation for axially separating the two shells, the first engaging surface is adapted to engage with the first engaged surface of the first engaged portion, when the first shell in the coupled state and the second housing is subjected to a first rotation operation for rotating the first housing with respect to the second housing about an axis in the one direction, the second engaging surface is adapted to be engaged with the second engaged portion of the first type of engaged portion face meshing;

Wherein the second type of engaging portion includes: a protrusion having a third engaging surface, when the first shell and the second shell in the coupled state are subjected to a first action for rotating the first shell around an axis relative to the second shell in the other direction. During the second rotation operation, the third engaging surface is adapted to engage with the third engaged surface of the second type of engaged portion; and

Wherein the first type of engaged portion includes a first matching groove with first and second engaged surfaces, and the second type of engaged portion includes a second matching groove with a third engaged surface.

12. The axial-flow blower with double impellers according to claim 11, wherein the ends of the first housing and the second housing respectively have almost rectangular profiles,

one of the hooks and one of the protrusions are provided at each of at least three of the four corners in the end of the first housing, and

One of the first fitting grooves and one of the second fitting grooves are formed in each of at least three of the four corners of the second housing.

13. An axial flow blower with double impellers, comprising:

The first axial blower unit includes: a first casing including an air passage having a suction port and a discharge port on both axial end sides thereof; a first impeller having a plurality of blades adapted to rotate in the suction port; and

The second axial blower unit includes: a second casing including an air passage having a suction port and a discharge port on both axial end sides thereof; a second impeller having a plurality of blades adapted to rotate in the discharge port;

Wherein the first casing of the first axial flow blower unit and the second casing of the second axial flow blower unit are combined through a coupling structure;

wherein the ends of the first housing and the second housing respectively have an almost rectangular profile,

a first fitting groove and a second fitting groove are formed in each of at least three of the four corners of the first housing, and

a hook and a protrusion are integrally provided at each of at least three of the four corners in the end of the second housing;

Wherein the hook and the first matching groove are shaped so as to form a first engagement structure, and the first engagement structure is suitable for axially separating the first shell and the second shell when they are in a coupled state. When the separation operation of the housing and the second housing resists the separation operation, the first engagement structure is also suitable for being subjected to rotation about the shaft in one of the two rotation directions when the first housing and the second housing are in the coupled state. resisting the first rotational operation while rotating the first rotational operation of the first housing with respect to the second housing; and

Wherein the protrusion and the second fitting groove are shaped such that a second engagement structure is formed, and the second engagement structure is suitable for being used in connection with the first shell and the second shell in the coupled state. The second rotation operation of the first housing is resisted when the second rotation operation of the first housing is rotated about the axis relative to the second housing in the other rotation direction relative to one direction.

Claims (13)

1. An axial-flow blower with double impellers, comprising: a housing having an air passage therein having a suction opening on one of its two axial end sides and a discharge opening on the other axial end side thereof; a first impeller having a plurality of front blades rotating in the suction port, adapted to rotate in the suction port; a first motor to rotate the first impeller about the axis of the blower in one of two rotational directions; a second impeller having a plurality of trailing blades adapted to rotate in the discharge port; a second motor to rotate the second impeller about the shaft in another rotational direction opposite to the one direction; and a plurality of stator vanes extending radially and fixedly disposed between the first impeller and the second impeller in the housing; Wherein the number of front blades is five, the number of stationary blades is three, and the number of rear blades is four. 2. The axial-flow blower with double impellers according to claim 1, wherein the front vane is curved in a cross-section of the front vane taken in a direction parallel to the shaft so that its inner arc is directed toward the opening in one direction; wherein the trailing blade is curved in a cross-section of the leading blade taken in a direction parallel to said axis such that its inner arc is open towards said other direction; and Wherein the stationary vane is curved in a cross-section of the front vane taken in a direction parallel to said axis such that its inner arc is open towards said other direction and towards the direction in which the rear vane is arranged. 3. The axial flow blower with double impellers according to claim 2, wherein the first impeller has an annular outer peripheral wall surrounding the axis of the base on which the five front blades are integrally mounted; and Wherein the second impeller may have an annular peripheral wall surrounding the axis of the base on which the four trailing blades are mounted integrally. 4. The axial blower with double impellers according to claim 3, wherein the rotation speed of the second impeller is slower than that of the first impeller. 5. An axial flow blower with double impellers, comprising: A first axial flow blower unit comprising: a first casing including an air passage having a suction port on one of its two axial end sides and a discharge port on the other axial end side thereof an outlet portion; a first impeller having a plurality of front blades adapted to rotate in the suction portion; a first motor rotating the first impeller about the axis of the blower in one of two rotational directions; and a plurality of webs , spaced along the circumference, installed in the discharge port portion to fasten the first motor to the first housing; and The second axial blower unit includes: a second casing including an air passage having a suction port on one of its two shaft end sides and a discharge port on the other shaft end side thereof. an outlet portion; a second impeller having a plurality of trailing blades adapted to rotate in the discharge outlet portion; a second motor rotating the second impeller about the shaft in another rotational direction opposite to the first direction; and a plurality of webs, circumferentially spaced apart, mounted in the suction port portion to secure the second motor to the second housing; wherein the first housing of the first axial blower unit and the second housing of the second axial blower unit are coupled to form a housing; wherein the plurality of webs of the first axial flow blower unit and the plurality of webs of the second axial flow blower unit are combined to form a plurality of fixedly disposed in the housing between the first impeller and the second impeller stationary blades; and Wherein the number of front blades is five, the number of stationary blades is three, and the number of rear blades is four. 6. The axial-flow blower with double impellers according to claim 5, wherein the front vane is curved in a cross-section of the front vane taken in a direction parallel to the shaft so that its inner arc is directed toward the opening in one direction; wherein the trailing blade is curved in a cross-section of the leading blade taken in a direction parallel to said axis such that its inner arc is open towards said other direction; and Wherein the stationary vane is curved in a cross-section of the front vane taken in a direction parallel to said axis such that its inner arc is open towards said other direction and towards the direction in which the rear vane is arranged. 7. The axial-flow blower with double impellers according to claim 6, wherein the first impeller has an annular outer peripheral wall surrounding an axis of a base on which five front blades are integrally mounted; and Wherein the second impeller may have an annular peripheral wall surrounding the axis of the base on which the four trailing blades are mounted integrally. 8. The axial blower with double impellers according to claim 7, wherein the rotation speed of the second impeller is slower than that of the first impeller. 9. An axial flow blower with double impellers, comprising: A first axial flow blower unit comprising: a first casing including an air passage having a suction port on one of its two axial end sides and a discharge port on the other axial end side thereof an outlet portion; a first impeller having a plurality of blades adapted to rotate in the suction portion; and The second axial blower unit includes: a second casing including an air passage having a suction port on one of its two shaft end sides and a discharge port on the other shaft end side thereof. an outlet section; a second impeller having a plurality of blades adapted to rotate in the outlet section; Wherein the first casing of the first axial flow blower unit and the second casing of the second axial flow blower unit are combined through a coupling structure; Wherein the coupling structure includes: two kinds of engaged parts provided at the ends surrounding the outer circumference of the discharge port part of the first casing of the first axial flow blower unit; and two kinds of engaging parts provided around the second shaft at the end portion of the outer periphery of the suction port portion of the second casing of the flow type blower unit, and is adapted to be engaged with the two kinds of engaged portions; Wherein the two kinds of engaging parts and the two kinds of engaged parts include: The first type of engaging portion and the first type of engaged portion together form a first type of engagement structure, and the first type of engagement structure is suitable for axially separating the first shell when the first shell and the second shell are in the coupled state. When the separation operation of the second housing and the second housing is resisted, the first engagement structure is also suitable for the first housing and the second housing in the coupled state to be used to rotate around the shaft in one of the two rotation directions resisting the first rotational operation of the first housing when the first rotational operation is rotated with respect to the second housing; and The second engaging portion and the second engaged portion together form a second engaging structure, and the second engaging structure is suitable for being subjected to an action in the one direction when the first shell and the second shell are in a coupled state. During the second rotation operation of rotating the first casing with respect to the second casing around the axis in the opposite rotation direction, the second rotation operation is resisted. 10. The axial-flow blower with double impellers according to claim 9, wherein the first engagement which together forms the first engagement structure is made by bringing the ends of the first housing and the second housing closer together. The part and the first engaged part are brought into the coupled state, and by rotating the first housing with respect to the second housing about the axis in the one direction, the second engaging part and the second engaging part which together form the second engaging structure can be made The engaged part enters the coupled state. 11. The axial-flow blower with double impellers according to claim 10, wherein the first type of engaging portion comprises: a hook having a first engaging surface and a second engaging surface, when the first housing in the coupled state When the second shell is subjected to a separation operation for axially separating the two shells, the first engaging surface is adapted to engage with the first engaged surface of the first engaged portion, when the first shell in the coupled state and the second housing is subjected to a first rotation operation for rotating the first housing with respect to the second housing about an axis in the one direction, the second engaging surface is adapted to be engaged with the second engaged portion of the first type of engaged portion face meshing; Wherein the second type of engaging portion includes: a protrusion having a third engaging surface, when the first shell and the second shell in the coupled state are subjected to a first action for rotating the first shell around an axis relative to the second shell in the other direction. During the second rotation operation, the third engaging surface is adapted to engage with the third engaged surface of the second type of engaged portion; and Wherein the first type of engaged portion includes a first matching groove with first and second engaged surfaces, and the second type of engaged portion includes a second matching groove with a third engaged surface. 12. The axial-flow blower with double impellers according to claim 11, wherein the ends of the first housing and the second housing respectively have almost rectangular profiles, one of the hooks and one of the protrusions are provided at each of at least three of the four corners in the end of the first housing, and One of the first fitting grooves and one of the second fitting grooves are formed in each of at least three of the four corners of the second housing. 13. An axial flow blower with double impellers, comprising: The first axial blower unit includes: a first casing including an air passage having a suction port and a discharge port on both axial end sides thereof; a first impeller having a plurality of blades adapted to rotate in the suction port; and The second axial blower unit includes: a second casing including an air passage having a suction port and a discharge port on both axial end sides thereof; a second impeller having a plurality of blades adapted to rotate in the discharge port; Wherein the first casing of the first axial flow blower unit and the second casing of the second axial flow blower unit are combined through a coupling structure; wherein the ends of the first housing and the second housing respectively have an almost rectangular profile, a first fitting groove and a second fitting groove are formed in each of at least three of the four corners of the first housing, and a hook and a protrusion are integrally provided at each of at least three of the four corners in the end of the second housing; Wherein the hook and the first matching groove are shaped so as to form a first engagement structure, and the first engagement structure is suitable for axially separating the first shell and the second shell when they are in a coupled state. When the separation operation of the housing and the second housing resists the separation operation, the first engagement structure is also suitable for being subjected to rotation about the shaft in one of the two rotation directions when the first housing and the second housing are in the coupled state. resisting the first rotational operation while rotating the first rotational operation of the first housing with respect to the second housing; and Wherein the protrusion and the second fitting groove are shaped such that a second engagement structure is formed, and the second engagement structure is suitable for being used in connection with the first shell and the second shell in the coupled state. The second rotation operation of the first housing is resisted when the second rotation operation of the first housing is rotated about the axis relative to the second housing in the other rotation direction relative to one direction.

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