JP2002332995A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower with attaching grooves for attaching a dust bag or a nozzle to an air outlet, capable of eliminating the deburring work and improving the quality and outer appearance of the product. SOLUTION: The attaching grooves 22 which ate L-shaped on the side are formed in an attaching part 19 of the blower to which a dust bag or a nozzle is attached. Each attaching groove 22 has a bottom 23 so that the groove doesn't piercing through the inner wall surface and the outer wall surface of the attaching part. Since the attaching groove 22 has the bottom, resin penetrates all over the attaching groove 22 when molded. Accordingly, burrs will not be produced in the attaching grooves 22 and the deburring work is not necessary. In addition, as the grooves 22 have bottoms, the manufacture is easy without forming a wall of the cantilever structure and the quality and outer appearance of the product can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower to which accessories such as a dust bag and a nozzle are attached.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 13, an impeller is provided in a housing 3 having a suction port 1 (see also reference numeral 11 in FIG. 10) and an outlet port 2, and air is rotated by the rotation of the impeller. Blowers for pumping are known. An electric motor 4 for rotating an impeller is attached to a side surface of the housing 3, and a handle 5 that can be grasped manually is attached to the electric motor 4.

[0003] The blower is used for performing a blowing operation or a suction operation. For example, when used in a blowing operation for blowing out dust, litter, wood chips, and the like, an accessory nozzle is attached to the blowing port 2 of the blower. Meanwhile, garbage,
When used for cleaning work to collect small pieces of wood or the like, an accessory dust bag is attached to the outlet 2 of the blower.

[0004] As described above, in the blower, it is necessary to replace the dust bag or the nozzle at the tip of the outlet according to the suction and blowing operations. An L-shaped mounting groove 6 is formed in the blowout port 2 of the blower in order to replace a dust bag or a nozzle. The dust-collecting bag or the nozzle is attached to the outlet 2 by engaging a projection for engagement provided on the dust-collecting bag or the nozzle with the mounting groove 6.

[0005]

The housing 3 is formed of a divided body divided into two in the axial direction of the impeller so that the impeller can be stored. Generally, the housing 3 of the blower is manufactured by injection molding or the like in which a resin is poured into a mold to reduce the weight and cost.

However, in the conventional blower, the L-shaped mounting groove 6 formed in the outlet 2 is formed in a slit shape penetrating from the inner wall surface to the outer wall surface of the outlet 2. Therefore, when the divided body is formed of resin as shown in FIG. 14, the resin is likely to remain on the mating surface 9 of the upper die 7 and the lower die 8 in the mounting groove 6, and as a result, excess resin is left in the mounting groove 6. Meat, so-called burrs, occur. If the dust bag or the nozzle interferes with the burr, it becomes difficult to attach the dust bag or the nozzle to the outlet, so that it is necessary to remove the burr in a step different from the molding step.
The burrs remaining on the inner wall side of the outlet 2 are particularly difficult to remove, not only making the appearance worse, but also making the work of removing the burrs more difficult.

[0007] As shown in FIG. 13, when the mounting groove 6 is formed, a wall 6 a having a cantilever structure that is elongated in the circumferential direction is formed at the edge of the outlet 2. The wall 6a is easily deformed when the resin cools, which causes a problem in that the shape of the mounting groove 6 varies, making it difficult to stabilize the quality and difficult to manufacture.

Accordingly, the present invention can eliminate the deburring operation in a blower having a mounting groove for mounting a dust collecting bag or a nozzle at an outlet, is easy to manufacture, and has good quality and quality of the product. An object is to provide a blower that can improve the appearance.

[0009]

In order to solve the above-mentioned problems, the present inventor has proposed that a mounting groove formed in an outlet has a bottom so as not to penetrate from an inner wall surface to an outer wall surface, and the mounting groove is formed at the time of molding. The resin spread throughout the groove.

That is, the invention according to claim 1 is a blower in which a mounting groove for mounting accessories such as a dust collecting bag or a nozzle is formed in a cylindrical mounting portion, wherein the mounting groove is formed in the mounting portion. The above-mentioned problem has been solved by a blower characterized by having a bottom so as not to penetrate from the inner wall surface to the outer wall surface.

According to a second aspect of the present invention, in the blower according to the first aspect, a cross-sectional shape of an inner wall surface of the mounting portion is formed in an elliptical shape, and the mounting groove is larger than a major axis of the elliptical shape. It is characterized by being arranged at a position close to the short axis.

Further, the invention according to claim 3 is the blower according to claim 1 or 2, wherein a distance from a center of the mounting portion to a surface of the bottom increases in a circumferential direction.

According to a fourth aspect of the present invention, in the blower according to any one of the first to third aspects, the outer shape of the mounting portion is formed in a taper whose width gradually decreases toward the tip. .

According to a fifth aspect of the present invention, in the blower according to any one of the first to fourth aspects, the mounting portion is divided into two parts left and right from a center line thereof, and the mounting groove is divided into two parts. It is characterized by being formed in each part.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A blower according to an embodiment of the present invention will be described below with reference to the accompanying drawings. First, the configuration of the entire blower will be described with reference to FIGS. FIG. 1 shows a plan view (including a partial cross section) of the blower,
FIG. 2 shows a side view (including a partial sectional view) of the blower. The blower includes a fan housing 13 having an inlet 11 and an outlet 12, an impeller 14 housed in the fan housing 13, and a drive shaft 1 coupled to the impeller 14.
5 and an electric motor 16 as a drive source for rotating the drive shaft 15. The electric motor 16 is housed in a motor housing 17 attached to a side surface of the fan housing 13. A handle 18 is attached to the motor housing 17.

The fan housing 13 is formed in a substantially disk shape, and has a spiral chamber 24 in which the suction port 11 and the blow port 12 communicate with each other. The suction port 11 is formed on a side surface of the fan housing 13 on a center line of the impeller 14.
The outlet 12 is formed to extend tangentially from the peripheral wall of the spiral chamber 24. An attachment portion 19 to which accessories such as a dust bag or a nozzle are attached is formed on the tip side of the outlet 12. The configuration of the mounting portion 19 will be described later.

The fan housing 13 is formed with a dividing surface 20 extending in a direction perpendicular to the axis of the impeller, and the dividing surface 20 divides the fan housing 13 into two in the direction of the axis of the impeller 14. Each of the divided bodies 13a and 13b of the fan housing is manufactured by injection molding or the like of engineering plastic such as polycarbonate or nylon, and is connected by connecting means such as bolts.

The impeller 14 housed in the divided bodies 13a and 13b is a so-called centrifugal impeller which causes a vertical outward flow of the drive shaft 15 in the sucked air. Impeller 1
The drive shaft 15 is fixed to the center of 4 by fixing means such as press-fitting and bolt connection. The drive shaft 15 extends into the motor housing 17. The rotor 16a of the electric motor 16 is fixed to the drive shaft 15 in the motor housing 17, and the stator 16b of the electric motor 16 is fixed to the motor housing 17. One end of the drive shaft 15 is supported by a bearing provided on the motor housing 17, and the other end is supported by a bearing provided on the fan housing 13.

A handle 18 attached to the motor housing 17 is elongated in a plane perpendicular to the center line of the impeller 14 so that the outlet 12 can be easily directed to an object.
The side surface is formed in a substantially arc shape. Handle 1
The switch 8 is provided with a switch (not shown) for turning on and off the electric motor 16. When the switch is turned on, the impeller 14 rotates and the air sucked from the inlet 11 is blown out from the outlet 12 in a state where the pressure is increased.

The structure of the mounting portion 19 will be described. 3 shows a side view of the blower, FIG. 4 shows a view of the mounting section taken along the arrow IV, and FIG. 5 shows a cross-sectional view of the mounting section along the line VV. At the tip of the outlet 12, a cylindrical mounting portion 19 having a step and a reduced external shape is formed. The mounting portion 19 is formed in a taper whose width gradually decreases toward the tip. Similarly to the fan housing 13, the mounting portion 19 is formed with a dividing surface 20 extending in a direction parallel to the center line, whereby the mounting portion 19 is divided into two right and left sides from the center line.

The mounting portion 19 is provided with a mounting groove 22 for mounting accessories such as a dust bag or a nozzle. The mounting groove 22 is formed in each of the pair of divided bodies 19a and 19b. The mounting groove 22 has an L-shaped side surface, and has an axial groove 22a and a circumferential groove 22b.
It is composed of A projection provided on a dust bag or a nozzle is inserted into the mounting groove 22 from the axial direction. By rotating the projection of the inserted dust bag or nozzle in the circumferential direction, the dust bag or nozzle is attached to the outlet 12. The mounting groove 22 has a bottom 23 so as not to penetrate from the inner wall surface to the outer wall surface of the mounting portion 19.

FIGS. 6 and 7 show detailed views of the mounting portion 19. FIG. The cross-sectional shape of the inner wall surface of the mounting portion 19 is formed in an elliptical shape in which the ratio of length to width is changed. The vertical dimension L is set larger than the horizontal dimension S. Dividing surface 20 on the major axis of the elliptical shape
And a pair of mounting grooves 22 is located on the short axis side. The surface of the bottom 23 of the mounting groove 22 formed in the divided body 19a has a constant radius of curvature R from a point P1 eccentric upward by a distance a from the center of the mounting portion. Also, divided body 1
The surface of the bottom 23 of the mounting groove 22 formed in 9b has a constant radius of curvature R from a point P2 eccentric downward by a distance a from the center of the mounting portion. As a result, each of the pair of mounting grooves 22, 22 is positioned from the center P of the mounting portion to the bottom 23 in the circumferential direction in which the dust bag or the nozzle is rotated.
The distance to the surface is gradually increasing. For example, the distance from the center P to the surface of the bottom 23 of the mounting groove 22 increases from r1 to r2 in the circumferential direction.

As described above, since the mounting groove 22 formed in the mounting portion 19 has the bottom 23 so as not to penetrate from the inner wall surface to the outer wall surface, the resin spreads over the entire mounting groove 22 during molding. For this reason, after molding, the mounting groove 2
No burrs are generated in 2 and the work of deburring becomes unnecessary. In addition, by providing the bottom 23 in the mounting groove 22, the mounting groove 22 is filled with resin, and a cantilevered wall or the like which is easily deformed after molding is not formed.

By making the cross-sectional shape of the inner wall surface of the mounting portion 19 elliptical, the thickness of the bottom portion 23 of the mounting groove 22 can be made sufficiently large, and required strength can be secured.
Further, when the elliptical shape is adopted, the cross-sectional area of the inner wall surface of the mounting portion 19 is somewhat reduced as compared with the case of the circular shape.
Since a sufficiently large cross-sectional area can be ensured with respect to the cross-sectional area on the front end side, there is almost no effect on the air volume.

FIG. 8 shows the nozzle 26 mounted on the mounting portion 19. The nozzle 26 is formed in a taper whose width gradually decreases toward the tip. At the base end of the nozzle 26, a ring portion 27 that is attached to and detached from the attachment portion 19 is formed. A pair of inner circumferential projections 28 are formed on the inner circumference of the ring portion 27 at intervals of 180 degrees. This inner circumference projection 2
8 and 28 engage with the mounting grooves 22 of the mounting portion 19. Further, outer peripheral projections 29, 29 are also formed on the outer periphery of the ring portion 27 at intervals of 180 degrees. These outer peripheral projections 29, 29
Engages with a mounting groove formed on the inner periphery of the suction port 11.

FIG. 9 shows a dust bag 30 attached to the attachment portion 19. The dust bag 30 includes a ring portion 31 that is attached to and detached from the attachment portion 19, a bone plate 32 that extends from the ring portion 31 and supports the bag, and a mesh-shaped bag 33 that is supported by the bone plate 32. Is done. A pair of inner peripheral projections 34 and 3 are formed on the inner periphery of the ring portion 31 at an interval of 180 degrees.
4 are formed. The inner peripheral projections 34, 34 engage with the mounting grooves of the mounting portion. The opening edge of the bag 33 is attached to the ring portion 31, and the sucked dust, small pieces of wood, etc.
Stored in 3.

FIG. 10 shows a blower in which a nozzle 26 is attached to the outlet 12. When the blower is used for the blowing operation, the nozzle 26 is mounted on the mounting portion 19 of the blowing port 12. On the other hand, nothing is attached to the suction port 11.

The mounting direction of the nozzle 26 to the mounting portion 19 will be described. First, the inner peripheral protrusions 28, 28 formed on the ring portion 27 of the nozzle 26 are aligned with the axial grooves 22a, 22a of the mounting groove 22, and the nozzle 26 is axially moved until the root of the nozzle 26 contacts the step of the outlet. Move in the direction. Next, the nozzle 26 is rotated in the circumferential direction, and the inner circumferential projections 28, 28 are engaged with the circumferential grooves 22b, 22b. Thereby, the nozzle 26 is attached to the attachment portion 19.

Fan housing 1 having outlet 12
In the case of molding No. 3, the outlet 12
The tip of is slightly open to the outside. Air may leak from the opened portion, or abnormal noise may be generated. According to the present invention, since the distance from the center of the mounting portion 19 to the surface of the bottom 23 of the mounting groove 22 increases in the circumferential direction, when the nozzle 26 is mounted on the mounting portion 19 and rotated, the protrusion of the nozzle 26 28, 28 hold down the fan housing 13 from both sides to correct the housing that is slightly open. Also, since the outer shape of the mounting portion 19 is formed in a taper whose width gradually decreases from the root to the tip,
Even if the tip of the outlet 12 is slightly opened due to shrinkage after molding, the nozzle 26 can be easily attached.

FIGS. 11 and 12 show a blower in which a dust collecting bag 30 is attached to the outlet 12 and a nozzle 26 is attached to the inlet 11. FIG. When using a blower for suction work,
The dust collecting bag 30 is attached to the attaching portion 19 of the outlet 12, and the nozzle 26 is attached to the inlet 11. The ring portion 27 of the nozzle 26 is provided on the inner peripheral surface of the suction port 11.
Are engaged with each other. The dust bag 30 is attached to the outlet 12 similarly to the nozzle 26.

[0031]

According to the first aspect of the present invention, the mounting groove formed in the mounting portion of the outlet has a bottom so as not to penetrate from the inner wall surface to the outer wall surface. The resin spreads. For this reason, burrs do not occur in the mounting groove, and the work of deburring is unnecessary.
In addition, by providing the bottom in the mounting groove, it is possible to easily manufacture the product and improve the quality and appearance of the product without forming a cantilevered wall or the like which is easily deformed after molding.

According to the second aspect of the present invention, the thickness of the bottom of the mounting groove can be made sufficiently large, and the necessary strength can be secured. Even if it is elliptical, the cross-sectional area of the mounting portion serving as the air passage can be sufficiently ensured, so that there is almost no influence on the air volume.

When a housing having an outlet is formed, the tip of the outlet tends to open outward due to shrinkage after molding. Air may leak from the opened portion, or abnormal noise may be generated. According to the third aspect of the present invention, the distance from the center of the mounting portion to the surface of the bottom of the mounting groove increases in the circumferential direction. The protrusion of the bag or the nozzle presses the housing from both sides, and corrects the housing that tends to open.

According to the fourth aspect of the present invention, since the outer shape of the mounting portion is gradually narrowed from the root toward the tip, the tip of the outlet is likely to open outward due to shrinkage after molding. In this case, the installation of the dust bag or the nozzle becomes easy.

According to the present invention, the mounting portion is divided into two parts from the center line to the left and right, and the mounting groove is divided into two parts.
Since it is formed in the divided mounting portion, the mold configuration is easy and the manufacturing can be facilitated.

[Brief description of the drawings]

FIG. 1 is a plan view (including a partial cross section) showing a blower according to an embodiment of the present invention.

FIG. 2 is a side view (including a partial cross section) of the blower.

FIG. 3 is a side view of the blower.

FIG. 4 is a view taken in the direction of arrow IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a detailed sectional view showing a mounting portion of the blower.

FIG. 7 is a detailed sectional view showing a mounting portion of the blower.

FIG. 8 is a diagram showing a nozzle ((A) is a side view, and (B) is a cross-sectional view taken along line VIII-VIII of (A)).

FIG. 9 is a view showing a dust collection bag ((A) in the figure is a side view, and (B) in the figure is a cross-sectional view taken along the line IX-IX of (A)).

FIG. 10 is a side view showing a blower to which a nozzle is attached.

FIG. 11 is a side view showing a blower to which a dust collection bag is attached.

FIG. 12 is a plan view showing a blower provided with a nozzle.

FIG. 13 is a perspective view showing a conventional blower.

FIG. 14 is a view showing an outlet manufactured by a mold.

[Explanation of symbols]

 19 ... Mounting part 22 ... Mounting groove 23 ... Bottom 26 ... Nozzle 30 ... Dust collection bag

Claims (5)

[Claims] 1. A blower in which a mounting groove is formed in a cylindrical mounting portion to which accessories such as a dust bag or a nozzle are mounted, wherein the mounting groove does not penetrate from an inner wall surface to an outer wall surface of the mounting portion. Blower characterized by having a bottom. 2. An elliptical cross section of an inner wall surface of the mounting portion, wherein the mounting groove is disposed at a position closer to a minor axis than a major axis of the elliptical shape. 2. The blower according to 1. 3. The blower according to claim 1, wherein a distance from a center of the mounting portion to a surface of the bottom increases in a circumferential direction. 4. The blower according to claim 1, wherein the outer shape of the mounting portion is formed in a taper whose width gradually decreases toward the tip. 5. The mounting part is positioned two to the left and right from its center line.
5. The blower according to claim 1, wherein the attachment groove is divided, and the attachment groove is formed in each of the attachment portions divided into two.