JP2023018725A - Vortex blower - Google Patents

Abstract

To provide a vortex blower in which a gap can be adjusted without disassembly and assembly.SOLUTION: A vortex blower comprises: a motor 110 comprising a shaft 111 extending in a first direction; an impeller 120 comprising an annular groove part 124, and a blade 125 located in the groove part 124, and attached to the shaft 111; and a casing 130 comprising a stationary flow passage 132s opposed to an opening of the groove part 124, and located at a distance from the impeller 120 in the first direction. The casing 130 comprises a protrusion part 137 extending in the first direction. The protrusion part 137 comprises an elongated hole extending in the first direction. The vortex blower comprises a bolt 150 located in the elongated hole, and for fixing relative positions of the motor 110 and the casing 130.SELECTED DRAWING: Figure 3

Description

The present invention relates to a gap adjustment method for a vortex blower.

A vortex blower includes an impeller having an annular flow path extending from an inlet port to a discharge port provided adjacently, a motor for driving the impeller, and provided between the motor and the impeller. It has bearings that support the shaft (see Patent Document 1). This type of swirl blower varies in performance due to changes in the gap between the casing and the impeller. The gap is adjusted by changing the amount of gap adjusting shims that are inserted between the bearing and the impeller.

JP-A-04-124495

However, the vortex blower shown in Patent Literature 1 has a problem that it is necessary to disassemble, adjust the amount of shims, and reassemble in order to adjust the gap.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the conventional problems described above and to provide a vortex blower in which the gap can be adjusted without disassembly and assembly.

The present invention comprises an electric motor having a rotating shaft extending in a first direction, an impeller having an annular groove and blades positioned in the groove and attached to the rotating shaft, and an air passage facing the opening of the groove. a casing spaced apart from the impeller in the first direction, the casing having a ridge portion extending in the first direction, the ridge portion extending in the first direction; a long hole extending in a direction; and a fixing member positioned in the long hole and fixing the relative position between the electric motor and the casing.

ADVANTAGE OF THE INVENTION According to this invention, the eddy current blower which can adjust a gap can be provided, without disassembling and assembling.

1 is an exploded perspective view of a vortex blower according to an embodiment of the present invention; FIG. 1 is a perspective view showing a single casing of a whirlpool blower according to an embodiment of the present invention; FIG. 1 is a partially cut longitudinal cross-sectional view of a vortex blower according to an embodiment of the present invention; FIG. 4 is an enlarged view of a main part of FIG. 3; FIG. FIG. 5 is a performance change diagram during gap adjustment in the embodiment of the present invention; It is a longitudinal cross-sectional view of a conventional vortex blower. FIG. 7 is an enlarged view of a main portion of FIG. 6; FIG. 4 is a partially cutaway vertical cross-sectional view of a vortex blower according to another embodiment of the present invention; FIG. 4 is a front view of a vortex blower according to another embodiment of the invention; It is a perspective view which shows the modification of the long hole of this embodiment. FIG. 11 is an enlarged view of the slot of FIG. 10;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing a vortex blower according to an embodiment of the invention.
As shown in FIG. 1 , the vortex blower 100 includes a motor (electric motor) 110 , an impeller 120 , a casing 130 and a base portion 140 . 1 shows the motor 110, the impeller 120, and the casing 130 separated in the axial direction Ax. FIG. 1 also shows the motor 110, the casing 130, and the base portion 140 separated in the vertical direction (vertical direction).

The motor 110 includes a shaft (rotating shaft) 111, a rotor 112 (see FIG. 3) fixed to the shaft 111, a stator 113 (see FIG. 3) that imparts rotational force to the rotor 112, and the rotor 112 and the stator 113. It is configured in combination with a motor case 114 to accommodate. One end of the shaft 111 protrudes from the motor case 114 toward the impeller 120 .

A flange portion 115 that protrudes in a direction perpendicular to the axial direction Ax (first direction) of the shaft 111 is formed in the lower portion of the motor case 114 in the vertical direction. The flange portion 115 is a member for fixing the motor 110 to the base portion 140, and is formed in a substantially plate shape along the axial direction Ax. A bolt insertion hole 115a through which a bolt 150 (fixing member) is inserted is formed on the side of the flange portion 115 on which the impeller 120 is located. A bolt insertion hole 115b through which a bolt 151 is inserted is formed on the side of the flange portion 115 opposite to the side where the impeller 120 is located. Although only one flange portion 115 is shown in FIG. 1, a similar flange portion is formed on the opposite side of the motor case 114, and bolt insertion holes 115a and 115b are similarly formed in the flange portion. ing.

The impeller 120 has a shroud 123 provided with a disc portion 121 (see FIG. 3) fixed to the shaft 111 and a curved portion 122 (see FIG. 3). The curved portion 122 is configured such that the concave surface faces the motor 110 side (the casing 130 side). An annular groove 124 (see FIG. 3) is formed on the inner surface of the curved portion 122 . Impeller 120 may be formed integrally with shaft 111 .

The groove portion 124 is defined by a plurality of vanes or blades 125 provided at predetermined intervals in the circumferential direction within the curved portion 122 (see FIG. 3) of the shroud 123 . A centrifugal groove is formed between the blades 125 adjacent in the circumferential direction. The blade 125 is curved in the axial direction Ax along the shaft 111 so that the front side in the rotation direction of the impeller 120 is concave, and is curved so that both ends in the radial direction protrude forward in the rotation direction from the central portion in the radial direction. are doing. Thus, the blade 125 is of a curved type curved three-dimensionally in two-dimensional directions along the circumferential surface and in the axial direction Ax along the rotation axis.

Casing 130 has curved portion 132 formed integrally with annular portion 131 (see FIG. 2). The curved portion 132 has a stationary flow path 132s (ventilation path) facing the opening of the groove portion 124 . Further, the casing 130 is integrally formed with a cylindrical portion 133 protruding in the axial direction Ax on the outer peripheral portion of the curved portion 132 .

A casing cover 160 (see FIG. 3) is attached to the cylindrical portion 133 of the casing 130 . Impeller 120 is covered with casing cover 160 . 1, illustration of the casing cover 160 is omitted.

The base portion 140 is a pedestal portion to which the motor 110 is fixed, and fixing holes 141a and 141b for fixing the motor 110 with bolts 150 and 151 are formed in the upper surface 140a. Although four fixing holes 141a and 141b are formed in FIG. 1, illustration of one fixing hole 141a is omitted. Also, the number of fixing holes 141a and 141b is not limited to four, and may be set as appropriate.

In addition, the base portion 140 has a suction channel 142 and a discharge channel 143 horizontally arranged on a side surface facing the axial direction Ax. A connection port 142a for connecting a suction pipe (not shown) is formed at the outer end of the suction flow channel 142, and air is supplied from the outside to the suction flow channel 142 via the suction pipe. A connection port 143 a for connecting a discharge pipe (not shown) is formed at the outer end of the discharge flow path 143 . A muffler (not shown) is incorporated in the suction flow path 142 and a muffler (not shown) is also incorporated in the discharge flow path 143 .

FIG. 2 is a perspective view showing the impeller of the vortex blower according to the embodiment of the invention.
As shown in FIG. 2, the casing 130 has a suction port 134 connected to a suction channel 142 formed in the base portion 140 (see FIG. 1) and a discharge port 135 connected to a discharge channel 143. It is The suction port 134 communicates with one end of a stationary flow path 132 s formed in the curved portion 132 . The discharge port 135 communicates with the other end of the stationary flow path 132 s formed in the curved portion 132 .

Further, the casing 130 is formed with a ridge portion 136 extending toward the motor 110 (see FIG. 1) above the suction port 134 . Further, the casing 130 is formed with a protrusion 137 extending toward the motor 110 (see FIG. 1) along the axial direction Ax above the discharge port 135 . In addition, the positions of the protrusions 136 and 137 are not limited to the upper portions of the suction ports 134 and 135, and can be changed as appropriate. The ridges 136 and 137 are formed, for example, in the shape of a square plate and extend along the axial direction Ax (see FIG. 1). Long holes 136a and 137a are formed in the ridges 136 and 137, respectively. The long holes 136a and 137a extend along the axial direction Ax and are formed to penetrate in the vertical direction (vertical direction).

FIG. 3 is a partially cut longitudinal cross-sectional view of a vortex blower according to an embodiment of the present invention. The upper portion of FIG. 3 is cut at the position of the shaft 111 , and the lower portion is the cut state at the position of the ridge portion 137 .
As shown in FIG. 3 , an arcuate (substantially annular) stationary flow path 132 s is formed on the inner surface of the curved portion 132 of the casing 130 . A suction port 134 (see FIG. 2) is formed on the outer peripheral side of one end in the circumferential direction of the stationary flow path 132s, and the suction port 134 is connected to the suction flow path 142 (see FIG. 1). A discharge port 135 is formed on the outer peripheral side of the other end in the circumferential direction of the stationary flow channel 132 s , and the discharge port 135 is connected to the discharge flow channel 143 . In this manner, the suction port 134 is a portion that connects the suction flow path 142 and the stationary flow path 132s. Also, a portion that communicates the discharge channel 143 and the stationary channel 132s is the discharge port 135 . The suction port 134 and the discharge port 135 are each provided on the radially outer peripheral side of the stationary flow path 132s.

The shaft 111 is provided with bearings 116 , 116 on both sides in the axial direction Ax of the shaft 111 . The bearing 116 is, for example, a ball type, and has an inner ring 116 a fixed to the shaft 111 and an outer ring 116 b fixed to a bracket 114 a of the motor 110 .

The discharge port 135 and the discharge channel 143 are sealed by, for example, a sealing material 144 so that air does not leak from the gap between the discharge port 135 and the discharge channel 143 . Although not shown, the suction port 134 and the suction flow path 142 are similarly sealed via a sealing material so that air does not leak from the gap at the connection between the suction port 134 and the suction flow path 142. It's like

A flange portion 115 formed in the motor case 114 is formed with a notch groove 115c into which the ridge portion 137 is slidably inserted. The cutout groove 115c has a shape in which the surface (lower surface) of the base portion 140 facing the upper surface 140a side is open. By fixing the motor 110 to the base portion 140, the cutout groove 115c and the upper surface 140a of the base portion 140 form a hole 115d into which the projection portion 137 is inserted so as to move back and forth. Similarly, on the rib portion 136 side, a notch groove is formed in the flange portion 115 and a hole is formed into which the rib portion 136 is inserted so as to move back and forth. The casing 130 can be moved in the axial direction Ax by moving the protrusion 137 in the hole 115d in the axial direction Ax. Thereby, the relative position (relative position) between the motor 110 and the casing 130 can be changed. As a result, the gap between impeller 120 and casing 130 can be adjusted without using shims and adjusting the amount of shims.

The flange portion 115 and the base portion 140 are fixed to each other by inserting the bolts 151 into the bolt insertion holes 115b of the flange portion 115 and screwing them into the fixing holes 141b (see FIG. 1) of the base portion 140. .

The ridge portion 137 is inserted into the hole 115d so as to move back and forth in the axial direction Ax. After inserting the ridge portion 137 into the hole 115 d , the bolt 150 is inserted through the bolt insertion hole 115 a of the flange portion 115 . Then, the bolt 150 is inserted through the elongated hole 137a (see FIG. 2) of the ridge portion 137 and screwed into the fixing hole 141a formed in the upper surface 140a of the base portion 140. As shown in FIG. By tightening the bolt 150, the protrusion 137 is held down in the hole 115d and is restricted from moving in the axial direction Ax. The ridge portion 136 is also fixed by the bolt 150 in the same manner as the ridge portion 137, and movement in the axial direction Ax is restricted.

4 is an enlarged view of a main part of FIG. 3. FIG.
As shown in FIG. 4, the motor 110 includes a lid portion 117 that closes one end of the cylindrical motor case 114 in the axial direction Ax. Note that the lid portion 117 is a portion shown in FIG. 4 with hatching omitted. Further, the lid portion 117 is fixed to the bracket 114a via bolts 152. As shown in FIG.

An outer surface 117 a of the lid portion 117 in the axial direction Ax is in surface contact with an outer surface 131 a of the annular portion 131 of the casing 130 . A boss portion 117b is formed on the lid portion 117 radially inward of the outer surface 117a and protrudes outward in the axial direction Ax (toward the impeller 120). The boss portion 117b is slidably inserted into a through hole 131b extending through the annular portion 131 in the axial direction Ax. In FIG. 4 , the outer surface 117 a and the outer surface 131 a are in close contact, in other words, the casing 130 is in contact with the motor 110 . In this state, the casing 130 is the farthest from the impeller 120 and the largest gap g is formed.

Curved portion 122 of impeller 120 is arranged to face curved portion 132 of casing 130 . An annular peripheral surface 125 a is formed on the outer periphery of the curved portion 122 . The peripheral surface 125 a is configured to slide against the inner peripheral surface 133 a of the cylindrical portion 133 of the casing 130 . Thereby, the impeller 120 can be slid in the axial direction Ax with respect to the casing 130 . That is, the gap (gap g) between the disk portion 121 of the impeller 120 and the annular portion 131 of the casing 130 can be adjusted. The vortex blower 100 of this embodiment has a characteristic that the narrower the gap g, the more pressure can be increased, and the wider the gap g, the more the air volume can be increased.

FIG. 5 is a performance change diagram during gap adjustment in the embodiment of the present invention. In FIG. 5, the case where the gap g is 0.3 mm is indicated by a solid line, and the case where the gap g is 0.6 mm is indicated by a broken line.
As shown in FIG. 5, the vortex blower 100 of this embodiment has the characteristic that the pressure Ps (kPa) decreases as the air volume Q (m ³ /min) increases regardless of the size of the gap g. .

In the eddy current blower 100 of the present embodiment, the performance when the gap g is 0.3 mm is such that the pressure Ps is higher on the closing side and the air volume Q is lower on the opening side than when the gap g is 0.6 mm. Become. With this performance, it is possible to increase the pressure by narrowing the gap g, and it is possible to increase the air volume by widening the gap g.

Next, the conventional vortex blower 1000 shown in FIGS. 6 and 7 and the vortex blower 100 of the present embodiment will be compared and explained. FIG. 6 is a vertical cross-sectional view of a conventional vortex blower, and FIG. 7 is an enlarged view of a main part of FIG.
As shown in FIG. 6, a conventional vortex blower 1000 shown as a comparative example is configured with a motor (electric motor) 1001, an impeller 1002, and a casing 1003. As shown in FIG. Casing 1003 is fixed to motor 1001 via bolts 1004 . In the vortex blower 1000, a motor 1001 is attached to a casing 1003, and a gap adjusting shim 1005 and an impeller 1002 are attached to a shaft 1011 (rotating shaft) of the motor 1001. FIG. A relative position between the motor 1001 and the casing 1003 is determined by bringing the motor 1001 into contact with a fitting portion 1006 provided on the casing 1003 . On the other hand, the impeller 1002 is fitted to the shaft 1011 of the motor 1001 and abutted against the abutting portion 1007 (bearing portion, step, or the like) of the motor 1001 to position the impeller 1002 in the axial direction. At this time, the distance between the gap surfaces (gap portion) between the impeller 1002 and the casing 1003 is not constant because the dimensional tolerances of the motor 1001, the casing 1003, and the impeller 1002 are accumulated, and adjustment work is required. do.

When adjusting the performance of the vortex blower 1000, the number of gap adjusting shims 1005 used is changed for adjustment. The gap adjusting shim 1005 is inserted between the motor 1001 and the impeller 1002 (in FIG. 7, between the bearing fixed to the shaft 1011 and the impeller 1002). implement. As described above, the conventional vortex blower 1000 has a problem that it is necessary to repeat disassembly and assembly for adjusting the gap.

Therefore, in this embodiment, the vortex blower 100 described with reference to FIGS. 1 to 5 is constructed. That is, the casing 130 is fixed to the base portion 140 via the protrusions 136 and 137 . This allows the motor 110 to move in the axial direction Ax. Further, since the impeller 120 is fixed to the motor 110 (shaft 111), when the motor 110 moves in the axial direction Ax, the impeller 120 also moves in the axial direction Ax. By fixing the motor 110 with bolts 150 (fixing members) after positioning, the relative positions of the casing 130 and the motor 110 are fixed, and the structure of the whirlpool blower 100 is configured. The bolt 150 has long holes 136a and 137a so as not to hinder the movement of the motor 110 in the axial direction Ax. The positioning of the motor 110 is performed while adjusting and checking the gap g between the impeller 120 and the casing 130 before fixing the motor 110 with the bolts 150 . In this case, there is no need to disassemble the impeller 120 .

As described above, the vortex blower 100 of this embodiment has the motor 110 having the shaft 111 extending in the axial direction Ax (first direction), the annular groove 124 and the blades 125 positioned in the groove 124 . In addition, the vortex blower 100 has an impeller 120 attached to the shaft 111 and a stationary flow path 132s (ventilation path) facing the opening of the groove 124, and is separated from the impeller 120 in the axial direction Ax (gap g). and a casing 130 positioned vacantly. The casing 130 has ribs 136 and 137 extending in the axial direction Ax. The ridges 136, 137 have long holes 136a, 137a extending in the axial direction Ax. Bolts 150 (fixing members) are provided in the long holes 136a and 137a to fix the relative positions of the motor 110 and the casing 130 (see FIGS. 1 to 3). According to this, since the relative position in the axial direction Ax between the casing 130 and the motor 110 can be adjusted, there is no need to perform disassembly and assembly, and workability in adjusting the gap g can be improved.

Further, in the present embodiment, the motor 110 (flange 115 of the motor case 114) is provided with a base portion 140 to which the motor 110 is fixed. A notch groove 115c (groove) is formed (see FIG. 3). According to this, since there is no need to process grooves and holes into which the protrusions 136 and 137 can be inserted on the base portion 140 side, it is possible to prevent the base portion 140 from increasing in size (increase in height dimension). can be done.

In addition, in the present embodiment, the casing 130 includes a suction port 134 that sucks air from a suction channel 142 formed in the base portion 140, a discharge port 135 that passes air to a discharge channel 143 formed in the base portion 140, Prepare. The ridges 136 and 137 are provided above the suction port 134 and the discharge port 135, respectively. According to this, since the protrusions 136 and 137 can be arranged between the motor 110 (flange portion 115) and the base portion 140, the motor 110 can be fixed to the base portion 140 using the bolts 150, and at the same time, the casing 130 ( The ridges 136 , 137 ) can be fixed to the base portion 140 and the motor 110 .

(another embodiment)
FIG. 8 is a partially cutaway vertical cross-sectional view of a vortex blower according to another embodiment of the present invention. FIG. 9 is a front view of a vortex blower according to another embodiment of the invention.
As shown in FIG. 8, the vortex blower 100A includes an impeller 180 integrally formed with the shaft 110. As shown in FIG. It should be noted that "integrated" means that the parts are configured as one part without combining the parts. By not using shims, it is possible to integrate the impeller and the shaft. By integrating the impeller and the shaft, the assembly error caused by combining the parts can be reduced, and the gap can be adjusted with higher accuracy.

As shown in FIG. 9, the vortex blower 100A includes a common base 182 to which the casing 181 is fixed, and a motor base 183 to which the motor 110 is fixed. The common base 182 is provided with a bolt insertion hole (not shown) through which the bolt 150 is inserted. This makes it possible to adjust the axial direction Ax.

In addition, the present invention is not limited to the above-described embodiment, and can include various modifications. For example, in the present embodiment, the motor 110 (flange portion 115) is provided with the notch groove 115c, and the flange portion 115 and the base portion 140 sandwich and fix the projecting portions 136 and 137. However, the flange portion 115 may be provided with holes through which the ridges 136 and 137 can move back and forth, or the base portion 140 may be provided with holes through which the ridges 136 and 137 can move back and forth. may Further, grooves may be formed on the upper surface of the flange portion 115 so that the protrusions 136 and 137 can slide.

Further, as shown in FIG. 10, stepped elongated holes (stepped holes) 191 are formed in the ridges 136 and 137, and the bolt 150 is provided with a step 201 (see FIG. 11) of the stepped elongated hole 191 (see FIG. 11). You may insert and fix the cap 192 match|combined. The stepped elongated hole 191 has a stepped structure with a step 201 for each predetermined gap adjustment amount. Also, by preparing a cap 192 having a shape that matches the width of the predetermined stepped portion (stepped width) W and fixing it to the stepped portion, it is possible to adjust the gap amount step by step for each stepped portion. Become. Thus, by changing the size of the cap 192, it is possible to change the gap amount to an arbitrary amount without measuring the gap.

1 eddy current blower 110 motor (electric motor)
111 shaft (rotating shaft)
114 motor case 115 flange portion 115a bolt insertion hole 115c notch groove 115d hole 120 impeller 124 groove portion 125 blade 130 casing 132s stationary flow path (ventilation path)
134 suction port 135 discharge port 136, 137 ridges 136a, 137a long hole 140 base portion 142 suction channel 143 discharge channel 141a fixing hole 150 bolt (fixing member)
180 Impeller integrated with shaft 181 Casing 182 Common base 183 Motor base 191 Stepped long hole (stepped hole)
192 stepped long hole cap 201 step (stepped portion)
Ax axis direction (first direction)
g gap (spacing)
W Width of stepped part (stepped width)

Claims (6)

an electric motor having a rotating shaft extending in a first direction;
an impeller having an annular groove and blades positioned in the groove and attached to the rotating shaft;
a casing having a ventilation passage facing the opening of the groove and positioned spaced apart from the impeller in the first direction;
The casing has a ridge extending in the first direction,
The vortex blower, wherein the ridge portion includes an elongated hole extending in the first direction, and a fixing member positioned in the elongated hole and fixing a relative position between the electric motor and the casing. The vortex blower of claim 1, wherein
A base portion to which the electric motor is fixed,
The whirlpool blower, wherein the electric motor is formed with a hole or a groove in which the ridge portion moves back and forth in the first direction. A vortex blower according to claim 2, wherein
The casing includes a suction port that sucks air from a suction channel formed in the base portion, and a discharge port that discharges air to a discharge channel formed in the base portion,
The vortex blower, wherein the ridges are provided above the suction port and the discharge port, respectively. In the vortex blower according to any one of claims 1 to 3,
A swirl blower, wherein the impeller is formed integrally with the rotating shaft. In the vortex blower according to any one of claims 1 to 4,
The swirl blower, wherein the elongated hole extends along the axial direction of the rotating shaft and is formed to penetrate in the vertical direction. A vortex blower according to claim 5, wherein
the long hole has a stepped portion with a width that varies stepwise along the first direction,
A swirl blower characterized in that it abuts against and is fixed to a cap adjusted to the stepped width of the stepped portion.

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