JP2002257097A - Powered working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powered working machine not being prohibited from sucking air to a centrifugal blower by some of foreign matters such as fallen leaves or waste paper. SOLUTION: In the powered working machine 10 provided with the centrifugal blower 14 and a dust-proofing member 50 provided on the centrifugal blower 14 to cover a suction opening 26 of the centrifugal blower 14 and including an air passing area enabling air to pass into the suction opening 26, an outer surface of the air passing area of the dust-proofing member 50 is projected in a direction separating from the centrifugal blower 14. Since the outer surface of the air passing area of the dust-proofing member 50 is projected to greatly increase the area in comparison with a flat shape, whole air passing area will not be closed even if considerable quantity of foreign matters are adsorbed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power working machine having a centrifugal blower, and more particularly to a portable power working machine such as a backpack blower device and a power sprayer.

[0002]

2. Description of the Related Art Some portable power working machines use a centrifugal blower, such as a backpack type blower device and a power sprayer. In general, a centrifugal blower used in such a portable power working machine is provided with an inlet cover at an intake port thereof, so that foreign matter such as fallen leaves can be sucked into the centrifugal blower and the user's hand, clothes, etc. And so on.

[0003] As shown in FIG.
Is generally formed integrally with the intake port 3 of the centrifugal blower 2, and usually has a net structure in a spider web or lattice shape.

[0004]

The inlet cover 1 of the conventional portable power working machine as described above has an outer surface, that is, a surface defined by an outer edge of a member constituting the inlet cover 1. It is almost flat.
Therefore, the area of the outer surface of the intake port cover 1 is as small as the area of the intake port 3, and the fallen leaves and the like are
As shown by the two-dot chain line in FIG.

When the intake port 3 is closed, the centrifugal blower 2
Of course, the air flow generated around the power working machine by the centrifugal blower 2 is reduced, which may cause overheating of the internal combustion engine, part of which is used as cooling air.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power working machine in which the suction of air into a centrifugal blower is not hindered by a small amount of fallen leaves or paper debris. It is in.

[0007]

In order to achieve the above object, the present invention provides a centrifugal blower (14) and a centrifugal blower (1) which covers an inlet (26) of the centrifugal blower (14).
And a dustproof member (50) provided at 4) and having an air passage area through which air can pass through the air inlet (26). Is characterized in that its outer surface is convex in a direction away from the centrifugal blower (14).

In this configuration, since the outer surface of the air passage area of the dustproof member (50) is convex, the area thereof is greatly enlarged as compared with a flat case, and a considerable number of foreign substances are adsorbed. However, the entire air passage area is not closed.

The dustproof member (50) is preferably a substantially conical member made of a mesh sheet such as a plastic net or a wire net. This is because a mesh sheet such as a plastic net is lightweight and has excellent workability. In the case of a mesh sheet, the entire dustproof member (50) becomes an air passage area, and the pressure loss is small. When attaching such a substantially conical dustproof member (50), its bottom edge (52) will be fixed to the centrifugal blower (14).

The power working machine (10) has a horizontal portion (16) and a rising portion (18) rising from one end of the horizontal portion (16). (2
A backpack type blower device (10) including a gantry (12) to which a centrifugal blower (14) is attached in a state where 6) faces each other.
In the case of a portable type such as described above, the vertex (54) of the substantially conical dustproof member (50) is located at the upright portion (1) of the gantry (12).
It is effective to be arranged near 8). in this case,
This is because the height (distance from the bottom surface to the vertex) of the conical dustproof member (50) is maximized, and the area of the outer surface of the dustproof member (50) can be made sufficiently large.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a backpack type blower device 10 according to the present invention. The backpack type blower device 10 is a type of a portable power working machine used when, for example, air is injected to collect fallen leaves, cut grass, and paper waste at a desired place. Shown blower device 10
Has a backpack frame 12 carried by an operator or a user, and a centrifugal blower 14 attached to the backpack frame 12.

The backpack frame 12 is an L-shaped gantry having a horizontal portion 16 and an upright portion 18 which rises from one end of the horizontal portion 16 at a substantially right angle. As shown in FIG. 1, the upright portion 18 is adapted to be put on the back of an operator or a user. Two shoulder bands 20 are attached to the backpack frame 12 so that the worker can carry the backpack. In a normal use state in which an upright worker carries the backpack frame 12, the upright portion 18 extends substantially vertically, and the horizontal portion 16 is substantially horizontal and extends away from the worker's back. In the present specification, the direction in which the horizontal portion 16 extends is conveniently defined as the rear based on this use state, and terms such as “up”, “down”, and “front” are used.

As clearly shown in FIG. 2, the centrifugal blower 14
Has an impeller 22 and a casing 24 that houses the impeller 22. A circular opening 26 is formed in the center of the front part of the casing 24.
Functions as an intake port for taking in air into the casing 24. The outer peripheral portion of the casing 24 has a spiral portion 28.
And the flow path area gradually increases toward the discharge port 30. Such a centrifugal blower 14
Is attached to the backpack frame 12 at a predetermined distance from the upright portion 18 with the air inlet 26 facing the upright portion 18 of the backpack frame 12.

An air injection tube 34 is connected via a flexible tube 32 to a discharge port 30 of a casing spiral portion 28 of the centrifugal blower 14. The tube 34 is provided with a handle 36 for the operator to grasp and adjust the direction of the distal end of the tube 34.

On the rear surface of the casing 24 of the centrifugal blower 14, an internal combustion engine 3 serving as a drive source of the centrifugal blower 14 is provided.
8 are arranged. Fuel for driving the internal combustion engine 38 is supplied to a fuel tank 40 mounted on the horizontal portion 16 of the backpack frame 12 and below the internal combustion engine 38.
Is stored in

Further, an inlet cover 42 is provided at the inlet 26 of the centrifugal blower 14. The intake port cover 42 of the illustrated embodiment is formed integrally with the casing 24 as a part thereof. This intake port cover 42 is, as shown in FIG.
As shown in FIG. 2, the casing 24 includes a plurality of annular members 46 concentrically arranged with the circular inner peripheral edge 44 of the casing 24 and a plurality of linear members 48 extending in the radial direction. It has a spider web-like net structure.

The above configuration is conventionally known. When the internal combustion engine 38 is driven to rotate the impeller 22 of the centrifugal blower 14, an air suction force is generated at the center of the casing 24 of the centrifugal blower 14. , The air around the blower device 10 is raised by the casing 24 and the standing portion 18 of the backpack frame 12.
And is sucked into the casing 24 from the air inlet 26. The sucked air is sent radially outward through the casing 24 by the impeller 22, and
8. The air is blown out from the air injection tube 34 through the flexible tube 32.

The blower device 10 of the illustrated embodiment further includes:
A dustproof member 50 is provided on the front surface of the casing 24. The dustproof member 50 has a substantially conical shape, and is attached to the casing 24 with its bottom edge 52 concentrically surrounding the air inlet 26. Therefore, the vertex 54 of the dustproof member 50 is directed toward the upright portion 18 of the backpack frame 12.

The dustproof member 50 is preferably made of a light and soft material such as a flat plastic net or a thin wire net, that is, a so-called mesh sheet. This is because it is excellent in workability and does not excessively increase the weight of the blower device 10 even when it is mounted. In the case of using a mesh sheet, the entirety of the dustproof member 50 becomes an air passage area through which air can flow, and there is also an effect that pressure loss due to the installation of the dustproof member 50 can be suppressed.

Processing into a substantially conical shape can be performed by various methods such as press working. When a plastic net is used, as shown in FIG. 4, a notch 56 is first formed in a disc-shaped plastic net 50a. Is formed, and by joining the both edges 57 and 58 of the notch 56, the substantially conical dustproof member 50 can be easily formed. Further, as shown in FIG. 5, instead of forming the notch, a simple method can be employed in which a radial slit 59 is formed in a disc-shaped plastic net 50b, and both sides of the slit 59 are overlapped and joined. A dustproof member 50 having a substantially conical shape can be manufactured.

As shown in FIG. 3, the dust-proof member 50 is attached to the casing 24 by arranging the bottom edge 52 of the dust-proof member 50 so as to be in contact with the front surface of the casing 24, and then, as shown in FIG.
What is necessary is just to fix to the casing 24 using 0 or the like. At this time, since the dustproof member 50 is soft, its bottom edge 52
Is brought into close contact with the front surface of the casing 24, so that there is an effect that no unnecessary gap is formed between the two.

The bottom edge 52 of the substantially conical dustproof member 50 is circular, and the diameter thereof is larger than the diameter of the air inlet 26. Preferably, the diameter of the bottom edge 52 is set to be equal to the minimum diameter of the spiral portion 28 of the casing 24 so that the bottom edge 52 of the dustproof member 50 can be attached to the casing 24 over the entire circumference so that the bottom edge 52 can be attached. It is better to be about the same. The diameter of the bottom edge portion 52 of the dustproof member 50 of the illustrated embodiment is about twice the diameter of the intake port 26.

Further, the height of the substantially conical dustproof member 50,
That is, when the dustproof member 50 is considered as a cone, the distance from the bottom surface to the vertex 54 is determined by the distance between the casing 24 and the backpack frame 1.
It is desirable that the gap be equal to or slightly smaller than the gap between the second standing portion 18. Thereby, the dustproof member 5
The vertex 54 of 0 is arranged near the upright portion 18 of the backpack frame 12.

In such an arrangement, the area of the outer surface of the substantially conical dustproof member 50 is the largest, and is 10 to 20 times the area of the air inlet 26. Therefore,
In order to completely close the air passage area of the dustproof member 50 having such a large area with fallen leaves, a number far exceeding the number required for closing the intake port cover 42 is required, and during the actual blower operation, In this case, the possibility that the air inlet 26 closes is extremely small. As a result, the centrifugal blower 14 exhibits a stable blowing ability, and can perform the blower operation efficiently. In addition, since the air around the blower device 10 passes through the dustproof member 50 and continues to flow into the intake port 26 of the centrifugal blower 14, the surface of the internal combustion engine 38 is constantly exposed to the cooling air, and the overheating of the internal combustion engine 38 also occurs. Is prevented.

When the above-described dustproof member 50 is provided, the suction port cover 42 may not be required. However, the dustproof member 50 in the present embodiment is soft and is not May be deformed, and if the suction port cover 42 is not provided, a deformed portion of the dustproof member 50 may enter the inside of the centrifugal blower 14. Therefore, it is preferable to leave the suction port cover 42 as it is.

Although the preferred embodiments of the present invention have been described in detail above, it is needless to say that the present invention is not limited to the above embodiments.

For example, the dustproof member 5 in the above embodiment
0 is a substantially conical shape, but the air passage area is a centrifugal blower 1
If the shape is such that it becomes convex in the direction away from 4 and has a large area, the dustproof member 50 'shown in FIG.
The shape may be a frustoconical shape such as a dustproof member 50 ″ shown in FIG.

If the dustproof member 50 has a certain degree of rigidity, the inlet cover 42 may be omitted.

Further, the present invention is not limited to a backpack type blower device, but is also applicable to a power working machine such as a handheld blower device, a backpack type or a handheld power sprayer.

[0030]

As described above, according to the present invention, the area of the air passage area of the dustproof member provided for preventing the foreign matter from being sucked into the intake port of the centrifugal blower is increased, so that some leaves fall. Even if a foreign substance such as is adsorbed to the dustproof member, the entire area of the air passage area is not completely closed, and a significant reduction in the blowing capacity of the centrifugal blower can be prevented.
Therefore, even in the environment where there is a high possibility that foreign matter is sucked into the intake port, a stable operation can be performed for a long time.

Since it is extremely rare that the air passage area of the dustproof member is completely closed, a stable airflow is generated around the power working machine, and a driving source of the centrifugal blower, a part of which is used as cooling air. Thus, the internal combustion engine can be sufficiently cooled, and overheating of the internal combustion engine can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a backpack type blower device according to the present invention.

FIG. 2 is a partially cutaway side view of the backpack type blower device according to the present invention.

FIG. 3 is an exploded perspective view showing a centrifugal blower and a dustproof member in the backpack type blower device of FIG.

FIG. 4 is a schematic explanatory view showing a method for producing the dustproof member shown in FIGS. 2 and 3.

FIG. 5 is a schematic explanatory view showing another method for producing the dustproof member shown in FIGS. 2 and 3.

FIG. 6 is a perspective view showing another form of the dustproof member.

FIG. 7 is a perspective view showing still another form of the dustproof member.

FIG. 8 is a front view showing an intake port of a centrifugal blower in a conventional portable power working machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Backpack type blower apparatus (power working machine), 12 ... Backpack frame (stand), 14 ... Centrifugal blower, 16 ... Horizontal part, 18 ... Standing part, 24 ... Casing, 26 ... Inlet, 38 ... Internal combustion engine, 42 ... intake port cover, 50 ... dustproof member, 52 ...
Bottom edge, 54 ... apex, 60 ... screw.

Claims (4)

[Claims] The centrifugal blower (14) is provided in the centrifugal blower (14) so as to cover the centrifugal blower (14) and an intake port (26) of the centrifugal blower (14), and controls the passage of air to the intake port (26). Dustproof member (50) having an air passage area to enable
A power working machine (10) comprising: a dust-proof member (50), wherein an outer surface of the air passage area is convex in a direction away from the centrifugal blower (14). Machine. 2. The dustproof member (50) is a substantially conical member made of a mesh sheet, and the bottom edge (52) of the substantially conical dustproof member (50) is the centrifugal blower (1).
The power working machine according to claim 1, wherein the power working machine is fixed to (4). 3. A horizontal part (16) and said horizontal part (16).
And a gantry (12) having an upright portion (18) erected from one end thereof, and the centrifugal blower (14) attached to the erected portion (18) with the intake port (26) facing the same. The power working machine according to claim 2, wherein a vertex (54) of the substantially conical dustproof member (50) is disposed near the upright portion (18) of the gantry (12). . 4. The power working machine according to claim 3, which is a backpack type blower device (10).