JP2001241019A - Dustproof device of knapsack engine blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an air intake of a knapsack engine blower from getting blocked by fallen leaves or the like. SOLUTION: In a dustproof device of a knapsack engine blower in which a nearly vertical back pad (5) is provided at one end of a frame (2), a centrifugal blower (20) driven by an engine (10) which is arranged at the other end of the frame (2) is fastened to the back (5) of the frame (2), and a dustproof cover having a dustproof net is provided in a manner that covers an air intake (7) formed between the back pad (5) and the volute case (21) of the centrifugal blower (20) along the periphery of the volute case (21), the dustproof cover (30) is provided with the dustproof nets (34) over openings provided on the top face (31) and the right and left sides (32, 33). In the case of a dustproof cover (30a), the top face (31) may be closed and the dustproof net (34) may be provided over the right and left sides (32, 33).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof device for preventing an intake port of a backpack type engine blower from being blocked by falling leaves or the like.

[0002]

2. Description of the Related Art FIG. 1 is a perspective view showing an operation state of a backpack type engine blower 1. As shown in FIG. In FIG. 1, a backpack type engine blower 1 includes an L-shaped base 2 having a backrest 5 that is substantially upright, and an engine 10 mounted on the base 2.
And a centrifugal blower 20 disposed on the side of the backrest 5 of the engine 10 and driven by the engine 10, shoulder bands 6, 6 attached to the backrest 5, and connected to the centrifugal blower 20. And an air tube 3 for blowing out the air from the centrifugal blower 20. The worker 4 has the backrest 5 of the gantry 2
On the back, carry the engine blower 1 on the back with the backing bands 6 and 6, blow air while holding the air tube 3 in your hand, and fallen leaves and debris due to the force of the wind blown out from the tip of the air tube 3. Is blown off for cleaning.

As a prior art of such a shoulder type engine blower, there is one described in, for example, Japanese Patent Application Laid-Open No. H11-148121. FIG. 7 is a side sectional view of a backpack type engine blower described in the publication. In the figure, a fan 23 of a centrifugal blower 20 is attached to the tip of a crankshaft 11 of an engine 10 mounted on a frame 2 of a backpack type engine blower 1c. It is provided inside a volute chamber 21 a formed by a volute case 21. In addition, stand 2
Backrest 5 and volute case 21 of centrifugal blower 20
An air inlet 7 is formed between the air inlet and the air inlet. When the engine 10 is driven, air flows from the air inlet 7 through the air inlet 22 provided in the volute case 21 to the volute chamber 2.
It is sucked into 1a and discharged outside by the fan 23. A part of the cooling air supply port 24 provided in the volute case 21 near the cylinder of the engine 10 is provided.
From the engine 10 to cool the engine 10.

Further, in a general backpack type engine blower, fallen leaves, dust, etc., which are wound up in the air during operation, are sucked into the air intake 7 and clogged between the backrest 5 and the volute case 21, A dustproof cover having a dustproof net 34c is provided at the inlet of the air inlet 7 so as not to hinder the air intake. When fallen leaves or the like are clogged between the backrest 5 and the volute case 21, the worker 4 inserts a finger into the air inlet 7 while driving the engine 10 to remove fallen leaves and dust. At this time, in order to prevent the fingers from contacting the fan 23, the safety net 5 is
0 is attached.

FIG. 8 is a perspective view for explaining a dustproof cover of a conventional general backpack type engine blower. As shown in the figure, a dustproof cover 30c is provided along substantially the outer periphery of the volute case 21 so as to cover the air intake port 7 between the gantry 2 and the volute case 21 of the centrifugal blower 20. The dustproof net 34c is attached to the opening formed on the upper surface. As a result, fallen leaves, dust, and the like are prevented by the dustproof net 34c, and fallen leaves and the like adhering to the dustproof net 34c can be manually wiped off from the outside.

[0006]

However, in the above-described conventional backpack type engine blower, the dustproof net 3
Since 4c is on the upper surface, fallen leaves and the like are easily put on the dustproof net 34c, and thus are easily attached. Also, the dust cover 30c
Since the opening is formed only on the upper surface, the opening area is small, and the flow velocity of the air in the dustproof net 34c is high. For this reason, since the fallen leaves and the like attached to the dustproof net 34c are hard to fall, the fallen leaves and the like easily block the dustproof net 34c.
When the dustproof net 34c is closed, the engine 10 may be burned.

The present invention has been made in view of the above problems, and has as its object to provide a dustproof device for a backpack type engine blower in which the air intake is not blocked by falling leaves or the like.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a backrest that is substantially perpendicular to one end of a gantry and is disposed at the other end on the gantry. The centrifugal blower driven by the engine is attached to the backrest side of the gantry, and the air intake formed between the backrest and the volute chamber of the centrifugal blower is almost along the outer periphery of the volute chamber. In the dustproof device of the backpack type engine blower provided with a dustproof cover having a dustproof net so as to cover, the dustproof cover has a structure in which a dustproof net is provided in openings formed in an upper surface portion and left and right side surface portions.

According to the above configuration, since the dust-proof net is provided at the opening on the upper surface and the left and right side surfaces of the dust-proof cover, the opening area is larger than that of the conventional one. Therefore, the flow velocity of the air is slow, and the adhesive force of the fallen leaves and the like is small, so that the fallen leaves and the like attached to the dustproof net are easy to fall, especially the fallen leaves and the like attached to both side surfaces are easy to fall. Therefore, there is no fear that the air intake is blocked and the engine burns.

In the present invention, the dustproof cover may have a structure in which a top surface is sealed and dustproof nets are provided in openings formed in left and right side surfaces. According to this configuration, since the dust-proof net is provided at the opening on both the left and right side surfaces of the dust-proof cover, the opening area is larger than that of the conventional case where the dust-proof net is provided only on the upper surface, and the air flow rate is lower. Since it is slow, the adhesion to the dustproof net is weak. Leaves and the like adhering to the dust-proof net on the side are easy to fall. In addition, since the upper surface on which fallen leaves and the like are easily placed is a closed cover, even if fallen leaves and the like fall on the air intake port, the amount of air does not decrease. Therefore, there is no fear that the air intake is blocked and the engine burns.

Further, in the present invention, it is preferable to provide a guard at an outer peripheral portion of the air inlet provided on the air inlet side of the volute chamber to prevent fingers from entering the air inlet. According to this configuration, even if the operator inserts his / her finger into the air intake through the eyes of the dust-proof net, there is no possibility that the finger touches the fan.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dustproof device for a shoulder type engine blower according to the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a side view of the backpack type engine blower 1 of the first embodiment. Note that the same components as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. A pedestal 2 having a substantially vertical backrest 5 on one side has a centrifugal blower 20 attached to the backrest 5 side, and an engine 10 mounted on the opposite side of the backrest 5 across the centrifugal blower 20. Have been. An air inlet 7 is formed between the backrest 5 and the volute case 21 of the centrifugal blower 20. Also, the backrest 5
A dustproof cover 30 is attached between the airtight case 21 and the volute case 21 so as to cover the air inlet 7 substantially along the outer periphery of the volute case 21. FIG. 3 shows the dustproof cover 3.
FIG. As shown in FIG.
Has an inverted U-shaped frame, and the upper surface 31 of the frame
A dustproof net 34 is provided inside the left and right side portions 32 and 33.
Is provided.

FIG. 4 is a side sectional view of the backpack type engine blower 1 of the first embodiment. An annular guard 40 protruding toward the air intake 7 along the outer periphery thereof is fastened to the intake 22 provided at a substantially central portion of the volute case 21 on the side of the air intake 7 with a bolt 41. . The cross-sectional shape of the guard 40 has a curved shape such that the tip has a smooth convex air flow resistance and a small air flow resistance, and the shape is such that air can be smoothly introduced into the intake port 22 easily. The gap S between the tip of the guard 40 and the backrest 5 is set to a size that does not allow a finger to enter.

In the backpack type engine blower 1 according to the present invention, the dustproof net 34 is provided so as to cover substantially the entire circumference of the air intake 7, that is, the upper surface and the left and right side surfaces of the air intake 7. In addition, the opening area of the dustproof net 34 is large, so that the flow velocity of the passing air becomes slow. Therefore, fallen leaves and the like hardly adhere to the dustproof net 34, and even if they do, they fall easily. In particular, fallen leaves and the like attached to both sides are likely to fall. Further, since the adhesive force is weak, it can be easily removed by hand. Therefore,
There is no danger that the air intake 7 will be blocked and the engine 10 will seize. In addition, since the gap S between the tip of the guard 40 and the backrest 5 is set to a size that does not allow a finger to enter, even if a finger or the like is inserted from the eyes of the dustproof net 34, the finger does not touch the fan 23. .

FIG. 5 is a side view of the backpack type engine blower 1a of the second embodiment. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described. A dustproof cover 30 a is attached between the backrest 5 and the volute case 21 of the centrifugal blower 20. FIG. 6 is a perspective view of the dustproof cover 30a of the present embodiment. As shown in the figure, the upper surface 31 of the dustproof cover 30a is sealed, and the left and right side surfaces 32, 33 are provided.
Only the openings are formed and dustproof nets 34, 34 are provided.

In the present embodiment, since the upper surface of the dust-proof cover 30a is sealed, even if leaves and the like accumulate on the upper surface, the amount of air from the air inlet 7 does not decrease, so that the seizure of the engine 10 does not occur. Other functions and effects are the same as those of the first embodiment, and thus description thereof is omitted.

As described above, according to the present invention, since the dust-proof net is provided at the opening on the upper surface and the left and right side surfaces of the dust-proof cover, or only at the opening on the left and right side surfaces, the conventional dust-proof net is provided. The opening area is large in comparison. Therefore, the flow velocity of the air is slow and the adhesion of falling leaves is small.
Fallen leaves and the like adhering to the dustproof net are easy to fall, especially fallen leaves and the like adhering to both sides. Therefore, there is no fear that the air intake is blocked and the engine burns.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an operation state of a backpack type engine blower.

FIG. 2 is a side view of the backpack type engine blower of the first embodiment.

FIG. 3 is a perspective view of a dust cover according to the first embodiment.

FIG. 4 is a side sectional view of the backpack type engine blower of the first embodiment.

FIG. 5 is a side view of a backpack type engine blower according to a second embodiment.

FIG. 6 is a perspective view of a dustproof cover according to a second embodiment.

FIG. 7 is a side sectional view of a conventional backpack type engine blower.

FIG. 8 is a perspective view illustrating a dustproof cover of a conventional backpack type engine blower.

[Explanation of symbols]

1, 1a: Backpack type engine blower, 2: Stand, 5: Backrest, 7: Air intake, 10: Engine, 20: Centrifugal blower, 21: Volute case, 21a: Volute chamber, 22: Inlet, 23 : Fan, 24: air inlet, 3
0, 30a: dustproof cover, 31: upper surface, 32, 33:
Side part, 34: dustproof net, 40: guard.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Satoshi Nakazawa 2-142-1, Sakuragaoka, Higashiyamato-shi, Tokyo F-term (reference) in Komatsu Zenoa Co., Ltd. 2D026 AC01

Claims (3)

[Claims] A backrest substantially perpendicular to one end of a gantry (2).
An engine having (5) and arranged at the other end on the gantry (2)
Attach the centrifugal blower (20) driven by (10) to the backrest (5) side of the gantry (2), and connect the backrest (5) and the volute case (21) of the centrifugal blower (20). Air intake formed between
(7) is provided substantially along the outer peripheral portion of the volute case (21) in a dustproof device of a backpack type engine blower provided with a dustproof cover having a dustproof net, wherein the dustproof cover (30) has an upper surface portion (31). ) And left and right side parts (32,
33) A dustproof device for a backpack type engine blower, wherein a dustproof net (34) is provided in the opening formed in (33). 2. A backrest substantially upright at one end of a gantry (2).
An engine having (5) and arranged at the other end on the gantry (2)
Attach the centrifugal blower (20) driven by (10) to the backrest (5) side of the gantry (2), and connect the backrest (5) and the volute case (21) of the centrifugal blower (20). Air intake formed between
(7) is provided substantially along the outer peripheral portion of the volute case (21), the dustproof device of the backpack type engine blower provided with a dustproof cover having a dustproof net, wherein the dustproof cover (30a) has an upper surface portion (31). ), And a dustproof net (34) is provided in openings formed in left and right side portions (32, 33). 3. The dustproof device for a backpack type engine blower according to claim 1, wherein a finger intake is provided on an outer peripheral portion of an intake port (22) provided on an air intake (7) side of the volute case (21). A dustproof device for a backpack type engine blower, comprising a guard (40) for preventing entry into the mouth (22).