JP2011140884A - Vortex blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vortex blower facilitating outflow of air flows from the distal ends of blades. <P>SOLUTION: The vortex blower includes an impeller which has a casing provided with a pressure chamber on a lateral side of an annular flow passage centered on an axis and the blades extending radially around the center of the axis and rotates about the axis, and through rotation of the impeller, lets air flow out from the blades into the pressure chamber, sucks the air from a suction port communicating with the annular flow passage and discharges the air from a discharge port communicating with the annular flow passage. In the vortex blower, the rear face 4B of the blade extending from the trailing edge 4SB of the blade 4 facing the pressure chamber includes: a base end rear face formed so that the inflow angle of air flowing in a cylindrical plane centered on the axis and passing the trailing edge base end of the blade 4 becomes an acute angle; a distal end rear face formed so that the outflow angle of air flowing out in a cylindrical plane centered on the axis and passing the trailing edge distal end of the blade 4 becomes an acute angle or a right angle; and a continuous face extending from the base end rear face to the distal end rear face. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vortex blower.

  An eddy current blower having a casing provided with an annular flow path having a pressure chamber on the side centered on an axis and an impeller having blades extending radially about the axis and rotating around the axis is known. ing. The vortex blower rotates the impeller to cause air to flow out from the blades to the pressure chamber, sucks air from the suction port communicating with the annular flow path, and discharges air from the discharge port communicating with the annular flow path.

  When the circle connecting the base ends of the blades is R1, the circle connecting the tip ends of the blades is R2, and the circle connecting the centers of the base ends and the tip is R3, the leading edge of the blades in R3 is the axis of the impeller. A vortex blower that has been retracted from an extension line connecting the base ends of the blades has been proposed (see, for example, Patent Document 1).

  In addition, a blade having a cross-sectional area defined between the blades so as to prevent separation of air flowing between the blades has been proposed (see, for example, Patent Document 2).

Japanese Patent No. 2960459 Japanese Patent No. 3003357

  However, in all of the blades disclosed in the above-mentioned patent documents, the velocity of the air flowing out into the pressure chamber is highest at the position of the third quarter of the radial direction of the blade, and is slow at the tip of the blade. For this reason, the air flowing out from the position of the third quarter of the radial direction of the blade is covered with the air flowing out from the tip of the blade, and the flow of air from the blade to the pressure chamber is obstructed. . When the flow of air from the blades to the pressure chamber is inhibited in this way, pressure loss occurs, and a high discharge pressure cannot be obtained.

  This invention is made | formed in view of the above, Comprising: It aims at providing the eddy current blower which can obtain a high discharge pressure.

  In order to solve the above-described problems and achieve the object, the present invention includes a casing in which a pressure chamber is provided on a side of an annular flow path centered on an axis, and a blade extending radially about the axis. And an impeller that rotates around the axis, and by rotating the impeller, air is discharged from the vane to the pressure chamber, and air is sucked from a suction port that communicates with the annular flow path. In a vortex blower that discharges air from a discharge port that communicates with the pressure chamber, the rear surface of the blade extending from the rear edge of the blade facing the pressure chamber flows into a cylindrical surface that passes through the rear edge proximal end of the blade centering on the axis. The rear end surface of the base end formed so that the inflow angle of the air to flow becomes an acute angle and the outflow angle of the air flowing out on the cylindrical surface passing through the front end of the rear edge of the blade centering on the axis are formed to be an acute angle or a right angle. Was And having a rear end, and a continuous surface extending distal the rear from the base end rear face.

  Further, the present invention is characterized in that, in the vortex blower described above, the rear face of the base end has an arc that protrudes through the rear edge, and the rear face of the tip has an arc that becomes concave through the rear edge.

  In the vortex blower described above, the rear end surface of the proximal end has an arc that is recessed through the rear edge, and the rear surface of the distal end has an arc that is recessed through the rear edge.

  Further, the present invention provides a vortex blower as described above, wherein the rear surface of the vortex blower is formed on a cylindrical surface passing through a position of the third outer quarter direction from the rear edge proximal end of the blade toward the rear edge distal end of the blade. It has an arc that is recessed through the edge.

  Further, the present invention is the above-described vortex blower, characterized in that the blade has an arc that is convex in the center in the width direction of the blade on a cylindrical surface that passes through the tip of the trailing edge of the blade, with the axis as the center. .

  In the rear surface of the blade extending from the trailing edge of the blade facing the pressure chamber of the vortex blower according to the present invention, the inflow angle of air flowing in the cylindrical surface passing through the proximal end of the blade centered on the axis is an acute angle. A rear surface of the base end formed on the cylindrical surface, a rear surface of the front end formed so that the outflow angle of the air flowing out on the cylindrical surface passing through the tip of the rear edge of the blade centering on the axis is an acute angle or a right angle, and the base end from the rear surface of the base end Since it has a continuous surface extending to the front surface, air inflow is promoted on the rear surface proximal end side of the blade, while air outflow is promoted on the rear surface front end side of the blade. Therefore, the vortex blower according to the present invention can obtain a high discharge pressure without hindering the flow from the blade to the pressure chamber.

FIG. 1 is a diagram showing the structure of a vortex blower according to an embodiment of the present invention. FIG. 2 is a side view of the impeller shown in FIG. FIG. 3 is a front view showing a front shape of the blade shown in FIG. FIG. 4 is a side view showing the side shape of the blade shown in FIG. FIG. 5A is a cross-sectional view illustrating the cross-sectional shape of the blade illustrated in FIG. 4, and illustrates the cross-sectional shape of the blade at the proximal end. FIG. 5-2 is a cross-sectional view showing a cross-sectional shape of the blade shown in FIG. 4, and is a view showing a cross-sectional shape of the blade having a cylindrical surface passing through the center between the base end and the tip as a cut surface. FIG. 5C is an end view showing the end face shape of the blade shown in FIG. 4, and shows the end face shape of the blade at the tip. FIG. 6A is a cross-sectional view illustrating the cross-sectional shape of the blade illustrated in FIG. 4, and illustrates the cross-sectional shape of the blade at the proximal end. FIG. 6-2 is a cross-sectional view showing the cross-sectional shape of the blade shown in FIG. 4, and is a view showing the cross-sectional shape of the blade with the cylindrical surface passing through the tip side from the base end and the center of the tip as a cut surface. is there. 6-3 is an end view showing the end face shape of the blade shown in FIG. 4, and is a view showing the end face shape of the blade at the tip. FIG. 7 is a diagram showing a velocity distribution of air flowing between the blades of the impeller. FIG. 8 is a side view showing the flow of air flowing between the blades of the impeller. FIG. 9 is a diagram showing the flow of air flowing between the blades of the impeller at the base end. FIG. 10 is a diagram showing the flow of air flowing between the blades of the impeller at the tip. FIG. 11 is a diagram illustrating the flow of air flowing between the blades of the impeller serving as a comparative reference. FIG. 12 is a diagram showing the characteristics of the blower according to the embodiment of the present invention. FIG. 13 is a cross-sectional view showing a modified example of the rear face shape of the blade, and is a view showing the blade at the proximal end.

  Embodiments of a vortex blower according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a diagram (sectional view) showing a structure of a vortex blower according to an embodiment of the present invention, and FIG. 2 is a side view of the impeller shown in FIG. FIG. 3 is a front view showing a front shape of the blade shown in FIG.

  As shown in FIG. 1, the vortex blower according to the present embodiment includes a casing 1, a prime mover 2, and an impeller 3.

  The casing 1 includes a casing body 11 and a casing cover 12. The casing body 11 and the casing cover 12 are joined to each other, and an accommodation space 14 and an annular flow path 15 connected to the accommodation space 14 are formed inside. The annular flow path 15 is an annular flow path centering on an axis extending in the horizontal direction, and has pressure chambers 15A and 15B on the left and right sides in the direction in which the axis extends.

  The casing body 11 is provided with a suction port (not shown) and a discharge port 11B. The suction port is provided in parallel with the axis and communicates with the annular flow path 15. The discharge port 11 </ b> B is provided in parallel with the axis, and communicates with the annular flow path 15, similarly to the suction port. The suction port and the discharge port 11B are separated by a partition wall (not shown), and the air sucked from the suction port does not discharge from the discharge port 11B without passing through the annular flow path 15.

  The prime mover 2 is for rotationally driving the impeller 3, and is attached to the casing body 11 so that the axis of the output shaft 20 of the prime mover 2 coincides with the axis of the annular flow path 15 described above.

  As shown in FIGS. 1 and 2, the impeller 3 is attached to the output shaft 20 of the prime mover 2 and rotates around the axis of the output shaft 20. The impeller 3 includes a hub 31, a disk 32, a rim 33, and a large number of blades 4. The hub 31 is a cylinder centered on the axis O, and is provided with a shaft hole 31A passing through the axis O. The shaft hole 31A is fitted and attached to the output shaft 20 of the prime mover 2 described above. The disk 32 is a thin disk extending radially outward from one end of the hub 31, and ribs 32 </ b> A extending radially outward from the hub 31 are provided. The rim 33 is a ring provided on the outer periphery of the disk 32, and its center coincides with the axis O.

  As shown in FIG. 3, the blade 4 is between a small-diameter (radius R1) cylindrical surface SA centered on the axis O and a large-diameter (radius R2) cylindrical surface SB centered on the axis O. , Formed between two orthogonal surfaces SS orthogonal to the axis O.

  The blade 4 extends from the above-described small-diameter cylindrical surface SA to the large-diameter cylindrical surface SB in the radially outward direction, and the above-described large-diameter cylindrical surface SB becomes the tip of the blade 4. Each blade 4 is provided at a position that equally divides the small-diameter cylindrical surface SA in the circumferential direction, and extends radially outward toward the large-diameter cylindrical surface SB. The blades 4 are formed symmetrically with respect to an orthogonal plane SM that is orthogonal to the axis O and bisects in the direction in which the axis O extends.

  FIG. 4 is a side view showing the side shape of the blade, and FIG. 5 is a cross-sectional view showing the cross-sectional shape of the blade. In addition, the cross section shown in FIG. 5 makes the cylindrical surface centering on an axis line a cut surface.

  As shown in FIGS. 4 and 5, the front surface 4 </ b> F of the blade 4 has a three-dimensional smooth curved surface shape, and a ridge that intersects the side surface 4 </ b> S becomes the front edge 4 </ b> SF of the blade 4.

  As shown in FIG. 4, the front edge 4SF of the blade facing the pressure chamber 15A (15B) has an axis O and a front edge base end A of the blade 4 in the radially outward direction from the front edge base end A of the blade 4. After retreating once from the connecting extended surface Sm, the center of the front edge base A of the blade 4 and the front edge tip B of the blade 4 extending radially outward from the front edge base A of the blade 4 (front of the blade 4) In the edge center C), it is advanced from the extended surface Sm. Further, in the region from the front edge center C of the blade 4 to the front edge tip B of the blade 4, it coincides with the extended surface Sm or advances from the extended surface Sm.

  The front edge 4SF of the blade 4 facing the pressure chamber 15A (15B) is an extended surface Sm that connects the axis O and the front edge base end A of the blade 4 from the front edge base end A of the blade 4 in the radially outward direction. If it is retracted more than once, it may coincide with the extended surface Sm at the front edge center C of the blade 4. Further, when the front edge 4SF of the blade 4 coincides with the extension surface Sm at the front edge center C, it may coincide with the extension surface Sm in the region from the front edge center C to the front edge tip B.

  As shown in FIG. 5A, the front surface 4F of the blade 4 has an acute inflow angle γA of the air flowing in the small-diameter cylindrical surface SA passing through the front edge proximal end A of the blade 4 with the axis O as the center. It has a proximal front surface formed. Specifically, the radius RA of the concave arc is set on the front surface of the base end so that the inflow angle γA is in the range of 30 degrees to 60 degrees centered on 45 degrees.

  As shown in FIG. 5C, the front surface 4F of the blade 4 has an outflow angle γB of air flowing out of the large-diameter cylindrical surface SB that passes through the front edge tip B of the blade 4 with the axis O as the center. The front end surface is formed as described above. Specifically, the radius RB of the convex arc is set on the front surface of the tip so that the outflow angle γB is 100 degrees to 105 degrees.

  As shown in FIG. 5B, the front surface 4F of the blade 4 has an acute inflow angle γC of air flowing in a cylindrical surface SC having a medium diameter (radius R3) passing through the front edge center C of the blade 4 with the axis O as the center. A central front surface formed to be Specifically, the radius RC of the concave arc is set at the center front surface. The radius RC of the arc is set larger than the radius RA of the arc set on the front surface of the base end.

  FIG. 6 is a cross-sectional view showing the cross-sectional shape of the blade, similar to FIG. In addition, the cross section shown in FIG. 6 makes the cylindrical surface centering on an axis line a cut surface similarly to FIG.

  The rear surface 4B of the blade 4 has a three-dimensional smooth curved surface shape, and a ridge that intersects the side surface 4S becomes the rear edge 4SB of the blade.

  As shown in FIG. 6A, the rear surface 4B of the blade 4 has an acute inflow angle βA of the air flowing in the small-diameter cylindrical surface SA passing through the front edge base A of the blade 4 with the axis O as the center. It has a proximal rear surface formed. Specifically, the radius rA of the convex arc is set on the rear face of the base end so that the inflow angle βA is in the range of 30 ° to 50 ° centered on 40 °.

  As shown in FIG. 6C, the rear surface 4B of the blade 4 has an outflow angle βB of air flowing out of the large-diameter cylindrical surface SB passing through the front edge tip B of the blade centering on the axis O so as to be a right angle or an acute angle. And a rear end surface formed at the front end. Specifically, the radius rB of the arc that becomes a concave passing through the trailing edge 4SB is set on the rear surface of the tip so that the central portion is convex and the outflow angle βB is 90 degrees.

  As shown in FIG. 6B, the rear surface 4B of the blade 4 is a cylindrical surface passing through the center of the front edge C of the blade 4 and the center of the front edge tip B (position of the third quarter in the radial direction) with the axis O as the center. In SD, the central portion is convex, and a radius rD of a circular arc that is concave from the central portion toward the rear edge 4SB is set.

  Further, as shown in FIG. 3, a chevron rib 40 is provided between the blade 4 and the blade 4 adjacent to the blade 4. The rib 40 gradually narrows from the outer peripheral surface of the rim 33 toward the radially outward direction.

  FIG. 7 is a view showing a velocity distribution of air flowing between the blades of the impeller, and FIG. 8 is a side view showing a flow of air flowing between the blades of the impeller. FIG. 9 is a diagram showing the flow of air flowing between the blades of the impeller at the proximal end, and FIG. 10 is a diagram showing the flow of air flowing between the blades of the impeller at the distal end.

  In the vortex blower described above, when the prime mover 2 is driven to rotate the impeller 3, air flows in the region from the front edge base end A to the front edge center C of the blade 4. As shown in FIGS. 7 and 9, the air flowing in from the region from the leading edge base end A to the leading edge center C initially flows in a direction opposite to the rotation direction of the impeller 3, It will have a velocity component in the opposite direction. Thereafter, the front surface 4 </ b> F of the blade 4 is acted, and a velocity component in the same direction as the rotation direction of the impeller 3 is imparted to the air, and the air flows in the same direction as the rotation direction of the impeller 3. Since the velocity component of air flowing in the same direction as the rotation direction of the impeller 3 gradually increases in the region from the center to the tip of the blade 4, the air in the region from the base end to the center is attracted to the tip. As shown in FIG. 8, the air having such a velocity distribution does not hinder the flow of air flowing out from the tip, but rather promotes the flow of air trying to flow out from the tip. Moreover, as shown in FIG. 10, the air which flows out from the front-end | tip flows without interfering with the rear surface 4B of the blade | wing 4 adjacent ahead.

  The front edge 4SF of the blade 4 of the vortex blower described above is temporarily retracted from the extended surface Sm connecting the axis O and the front edge base end A of the blade 4 in the radially outward direction from the front edge base end A, and then the blade 4 The front edge base C of the blade 4 and the front edge tip B of the blade 4 extending radially outward from the front edge base end A of the blade advance forward from the extension surface Sm at the front edge center C. While promoting the inflow of air in the region from the leading edge base end A to the leading edge center C of the blade 4, the air has a velocity component in the same direction as the impeller rotation direction in the region from the center of the blade to the tip of the blade. Is granted. In addition, since it moves forward from the extension surface Sm in the region from the front edge center C of the blade 4 to the front edge tip B of the blade 4, the velocity component increases from the center of the blade 4 toward the tip of the blade, Promotes air outflow. Therefore, the above-described vortex blower can obtain a high discharge pressure without hindering the air flow from the blade 4 to the pressure chamber 15A (15B).

  Further, the rear surface 4B of the blade 4 extending from the rear edge 4SB of the blade 4 facing the pressure chamber 15A (15B) of the vortex blower flows in the cylindrical surface passing through the rear edge proximal end of the blade 4 with the axis O as the center. Is formed so that the outflow angle βB of the air flowing out on the rear surface of the base end formed so that the inflow angle βA of the airflow becomes an acute angle and the cylindrical surface passing through the front end of the rear edge of the blade 4 with the axis O as the center. Since the rear end surface of the front end and a continuous surface extending from the rear end surface of the base end to the front end surface of the base end, the air inflow is promoted on the rear end proximal side of the blade, while the outflow of air is promoted on the rear end front side of the blade. To do. Therefore, the above-described vortex blower can obtain a high discharge pressure without hindering the flow from the blade 4 to the pressure chamber 15A (15B).

  Further, the rear surface 4B of the blade 4 has a central portion convex in a cylindrical surface SD passing through the center of the front edge C of the blade 4 and the center of the front edge tip B (position of the third quarter in the radial direction) with the axis O as the center. Since the radius rD of the arc that becomes concave from the central portion toward the rear edge 4SB is set, the air flowing out at the tip flows along the rear surface 4B of the front blade 4, and the rear surface of the blade 4 Pressure loss due to collision can be suppressed.

  FIG. 11 is a diagram illustrating the flow of air flowing between the blades of the impeller serving as a comparative reference. The leading edge 104SF of the impeller blade 104 is an extended surface that connects the axis O and the leading edge proximal end A at the leading edge center C of the leading edge proximal end A and the leading edge distal end B of the blade 104. Retreating from Sm.

  In the blade 104, the air flow at the tip of the blade 104 covers the air flow about to flow out from the tip of the blade 104, and the outflow of the air flow about to flow out from the tip is prevented.

  FIG. 12 is a diagram showing the characteristics of the blower according to the embodiment of the present invention. In this figure, the blades of the blower impeller as a comparative control extend radially from the front edge base end toward the front edge center and then advance from the front edge center toward the front edge tip. .

  The blade of the impeller of another vortex blower as a comparison is shown in FIG. 11, and the leading edge of the blade of the impeller is the leading edge that is the center of the leading edge proximal end and the leading edge tip. In the center, it retreats from the extended surface Sm connecting the axis and the base end.

  As shown in FIG. 12, when the impeller of the vortex blower according to the embodiment of the present invention is rotated at 3400 rpm, it can be seen that a discharge pressure that is clearly higher than that of the vortex blower serving as a comparative reference is obtained.

  Since the vortex blower according to the embodiment of the present invention described above facilitates the outflow of the air flow from the tip of the blade 4, a high discharge pressure can be obtained without increasing the outer shape.

  In the above-described embodiment, the radius rA of the arc that is convex on the rear surface of the base end is set. However, as shown in FIG. 13, the radius rA ′ of the arc that is concave on the rear surface of the base end is set. Also good.

DESCRIPTION OF SYMBOLS 1 Casing 11 Casing main body 11B Discharge port 12 Casing cover 14 Accommodating space 15 Annular flow path 15A, 15B Pressure chamber 2 Motor 20 Output shaft 3 Impeller 31 Hub 31A Shaft hole 32 Disc 32A Rib 33 Rim 4 Blade 4F Front 4SF Front edge 4B Rear surface 4SB Rear edge 4S Side surface 40 Rib A Front edge proximal end B Front edge tip C Front edge center O Axis SA Small diameter cylindrical surface SB Large diameter cylindrical surface SC Medium diameter cylindrical surface SD Cylindrical surface SM Orthogonal surface SS Orthogonal surface Sm Extended surface γA Inflow angle γB Outflow angle γC Inflow angle βA Inflow angle βB Outflow angle

Claims (5)

A casing provided with a pressure chamber on the side of the annular flow path centered on the axis, and an impeller having blades extending radially about the axis and rotating around the axis;
By rotating the impeller, the air flows out from the blade to the pressure chamber, sucks air from the suction port that communicates with the annular flow path, and discharges air from the discharge port that communicates with the annular flow path.
The rear surface of the blade extending from the rear edge of the blade facing the pressure chamber is:
A proximal rear surface formed so that an inflow angle of air flowing in a cylindrical surface passing through the rear edge proximal end of the blade centering on the axis is an acute angle;
A leading end rear surface formed so that an outflow angle of air flowing out in a cylindrical surface passing through the trailing edge tip of the blade centering on the axis is an acute angle or a right angle;
A vortex blower characterized by having a continuous surface extending from the proximal rear surface to the distal rear surface.   2. The vortex blower according to claim 1, wherein the rear surface of the proximal end has an arc that is convex through the rear edge, and the rear surface of the distal end has an arc that is concave through the rear edge.   2. The vortex blower according to claim 1, wherein the rear surface of the proximal end has an arc that is concave through the rear edge, and the rear surface of the tip has an arc that is concave through the rear edge. The rear surface of the blade is
It has an arc that passes through the rear edge and is concave in a cylindrical surface that passes through the position of the outer edge in the radially outward direction from the rear edge proximal end of the blade toward the rear edge tip of the blade. The vortex blower according to any one of claims 1 to 3. The blade is
5. The vortex blower according to claim 1, wherein the vortex blower has an arc that is convex at the center in the width direction of the blade on a cylindrical surface that passes through the rear edge tip of the blade with the axis as the center.

Images