JP4729460B2 - Engine blower - Google Patents

Description

  The present invention relates to an engine blower, and more particularly to an improvement in a mesh cover attached to an air intake port of a volute case.

  Conventionally, in a backpack-type engine blower, an air intake port of a volute case that accommodates a fan opens toward a back support portion of a frame that is close to and faces the volute case, and the volute case and the back support portion The gap between them is covered with a dustproof net so that fallen leaves and the like do not enter the air intake (for example, Patent Document 1).

  Such a dustproof net covers a wide range of the outer peripheral side of the gap between the volute case and the backrest part, i.e., a portion that is relatively far from the air intake port of the volute case. Largely provided. For this reason, the suction force acting on the fallen leaves and the like attached to the dustproof net is very small, and the attached fallen leaves can be easily dropped or removed.

JP 2001-241019 A

  By the way, in the engine blower of Patent Document 1, since the dust-proof net prevents suction of fallen leaves to the air intake, there is no net-like cover around the air intake. However, in this case, since the fallen leaves and the like sucked through the dust-proof net are easily sucked from the air intake, in order to prevent this, a rib-like continuous rib is formed around the air intake. A guard is provided by integral molding so that fallen leaves are not easily sucked.

  However, if a rib-shaped guard is provided on the volute case, the structure becomes complicated and air suction performance may be reduced. In order to prevent this, the shape around the air inlet should be flattened and a net-like cover should be attached to the air inlet. However, in this case, both the dustproof net and the cover are provided. Score increases.

  Also, if the dustproof net is omitted and only the cover is provided, this cover is provided near the air intake and the area of the net-like part is reduced, so that fallen leaves etc. are more likely to stick to the cover. The fallen leaves are difficult to wipe off and the air suction performance is further deteriorated. And in the type which cools an engine with a part of jet flow sent out by a fan, there is a possibility that cooling air cannot fully be supplied to an engine by reducing the amount of air sucked, and the engine will burn.

  An object of the present invention is to provide an engine blower that can simplify the structure around the air intake and reliably prevent engine seizure even if fallen leaves or the like stick to it.

  An engine blower according to claim 1 of the present invention includes a centrifugal blower having a volute case, a frame having a gantry portion on which the centrifugal blower is mounted, an engine for driving a fan accommodated in the volute case, and A cover that covers the air intake provided in the volute case, and a duct that communicates the inside and outside of the mesh portion that constitutes the cover, the tip of the duct portion being at a position away from the mesh portion It is characterized by being extended and opened.

  An engine blower according to a second aspect of the present invention is the engine blower according to the first aspect, wherein the duct portion is integrally formed with the mesh portion or the volute case.

  An engine blower according to a third aspect of the present invention is the engine blower according to the first or second aspect, wherein the frame portion of the frame is positioned below the centrifugal blower, and the frame portion includes upper and lower portions. An opening that penetrates through the opening is provided, and the tip of the duct portion extends into the opening and opens.

  In the above, according to the invention of claim 1, a wide space in which the tip of the duct portion is separated from the mesh portion (for example, not a narrow space such as a gap between the volute case and the backrest portion, but a position close to the outside, Moreover, even if the fallen leaves etc. flying in the air are difficult to be sucked), even if the net-like part is blocked by fallen leaves etc., air can be sufficiently taken in through the duct part. For this reason, cooling air for cooling the engine can be obtained with certainty, and engine burn-in can be reliably prevented. Further, since the cover covers the air intake port of the volute case, suction of fallen leaves and the like can be satisfactorily prevented without complicating the structure around the air intake port, and the structure can be simplified. In addition, since the conventional dustproof net can be made unnecessary by providing the cover, there is no fear of increasing the number of members.

  According to the second aspect of the present invention, handling is better than when the duct portion is provided separately from the mesh portion and the volute case, and the number of parts does not need to be increased in this respect.

  According to the invention of claim 3, the lower position of the pedestal portion is a place where the fallen leaves that are soared are most difficult to be sucked in, and the opening portion is provided in the pedestal portion so that the end of the duct portion is extended and accommodated in the opening portion. And can significantly reduce the suction of fallen leaves.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an engine blower 1 according to the present embodiment, FIG. 2 is a bottom view of the engine blower 1, FIG. 3 is a perspective view showing an essential part of the engine blower 1, and FIG. It is a disassembled perspective view which shows the principal part.

  The engine blower 1 is a backpack type, and a centrifugal blower 3 is mounted on an L-shaped frame 2 having a vertical backrest 21, and a two-stroke engine is mounted on a synthetic resin volute case 31 constituting the centrifugal blower 3. 4 is fixed, the fan 32 (FIG. 4) accommodated in the volute case 31 is rotationally driven by the engine 4, and the blown air generated by the rotation of the fan 32 is attached to the elbow 33 of the centrifugal blower 3. It is configured to blow out from the tube.

  The frame 2 is also made of synthetic resin, and a pair of attachment portions 23 are provided on the horizontal base portion 22 of the frame 2, and the centrifugal blower 3 is mounted on these attachment portions 23 via rubber mounts 24. In addition, another attachment portion 23 is provided on the back side of the backrest portion 21 described above, and the upper portion of the centrifugal blower 3 is attached to the attachment portion 23 via a coil spring 25. That is, the centrifugal blower 3 is supported at three points with respect to the frame 2. An operation arm for performing a throttle operation of the engine 4 is provided on the side of the frame 2, but the illustration thereof is omitted here.

  A gap S having a predetermined width is formed between the volute case 31 of the centrifugal blower 3 and the backrest portion 21 of the frame 2, and an air intake 34 provided in the volute case 31 toward the gap S side. It is open. A flat flat surface 36 is formed around the air inlet 34. The flat surface 36 is merely provided with a plurality of ribs 35 that protrude significantly smaller than the conventional amount, and the area around the air intake 34 has a simpler structure than the conventional one.

  Further, the flat surface 36 is provided with three cover mounting portions 37 in which female threads are engraved at equal intervals. A synthetic resin net-like cover 5 is screwed to the cover attaching portion 37 and another cover attaching portion 37 provided on the lower side. The cover 5 has a compact size that covers the flat surface 36 including the air intake 34, and is accommodated and disposed in the gap S in a state of being attached to the volute case 31.

  Specifically, the cover 5 includes a mesh part 52 having a large number of through holes 51 and a duct part 53 provided integrally with the mesh part 52. The net 52 covers most of the air inlet 34 and functions to prevent the fallen leaves and the like from being sucked into the air inlet 34. Further, the mesh portion 52 is located in the gap S, and thus functions as a cushion when the engine blower 1 is handled with care.

  That is, the mesh-like part 52 made of synthetic resin and provided with a large number of through-holes 51 has an appropriate elastic force, and the centrifugal blower 3 whose weight is increased by the attachment of the engine 4 is a coil spring. Even when it falls to the backrest 21 side due to an impact exceeding the drag of 25, the mesh portion 52 interposed in the gap S acts as a cushion to contact the backrest 21 in a planar shape, and the centrifugal blower 3 side Mitigates the impact transmitted to the. Therefore, even when the engine blower 1 falls with the backrest portion 21 facing down, damage to the centrifugal blower 3 and the engine 4 can be satisfactorily prevented. None of the conventional dustproof nets or the conventional covers having the net-like portions similar to the present embodiment have such a cushion function.

  On the other hand, the duct portion 53 of the cover 5 is integrally molded so as to protrude downward from the lower side of the mesh portion 52, and is formed in a hollow rectangular tube shape having a peripheral wall portion as shown in FIG. Yes. The rib 54 provided in the hollow part of the duct part 53 is for preventing an operator's finger | toe etc. from inserting in an inside, and for reinforcement. One of the ribs 54 is a screw insertion portion for fixing the cover 5.

  Such a duct part 53 is extended and accommodated in the opening part 26 provided in the mount part 22 of the flame | frame 2, and connects the exterior and the air intake 34 through the hollow part. The opening between the ribs 54 of the hollow portion is larger than the through hole 51 of the mesh portion 52 and is large enough to suck in the fallen leaves through the rib 54. Since it is in the opening 26 and opens downward, the fallen leaves and the like flying in the air are hardly actually sucked.

  The duct portion 53 extends from the mesh portion 52 to the opening portion 26 of the gantry portion 22 so that the duct portion 53 is greatly opened toward the outside without being obstructed by surrounding members. Even when blocked by fallen leaves, a sufficient amount of air can be taken in.

  In the engine blower 1 of the present embodiment, air is taken into the centrifugal blower 3 by the fan 32 driven by the engine 4, and the air at that time passes through both the mesh portion 52 and the duct portion 53 of the cover 5. It is taken in from the intake 34. The taken-in air is jetted from the volute case 31 through a wind pipe (not shown) and ejected from the tip opening of the wind pipe.

  Here, when the engine blower 1 is used during the cleaning operation of the fallen leaves, the fallen leaves that have risen in the air may stick to the net-like portion 52 of the cover 5 during the fall, and the net-like portion 52 may be blocked. However, even in such a case, as described above, since sufficient air can be taken in through the duct portion 53, the cooling air to the engine 4 can be reliably supplied, and the engine 4 can be prevented from being seized. . Of course, the amount of suction from the duct portion 53 is increased, and a sufficient amount of air can be secured from the wind pipe. Then, the sticking fallen leaves may be removed after the work is finished.

The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of quantity, other details, and the like.
Therefore, the description limited to the shape, quantity and the like disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  For example, in the above-described embodiment, the duct portion 53 of the cover 5 extends downward and opens downward while being accommodated in the opening portion 26 of the gantry 22, but the upper side of the volute case 31. In other words, it may be extended to a wide position away from the mesh portion 52 and open to the side where falling fallen leaves and the like are difficult to be sucked.

  In the above embodiment, the duct portion 53 is provided integrally with the mesh portion 52, but the duct portion 53 may be provided integrally with the volute case 31. Moreover, the duct part 53 is made into a different body from the mesh part 52 and the volute case 31, and may be retrofitted with a screw or the like. However, in this case, since the number of parts increases, it is desirable to provide the mesh unit 52 or the volute case 31 integrally.

  The present invention can be effectively used particularly for a backpack type engine blower.

The side view which shows the engine blower which concerns on one Embodiment of this invention. The bottom view of an engine blower. The perspective view which takes out and shows the principal part of an engine blower. The disassembled perspective view which shows the said principal part. The perspective view of the cover which comprises the said principal part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine blower, 2 ... Frame, 3 ... Centrifugal blower, 4 ... Engine, 5 ... Cover, 22 ... Mount part, 26 ... Opening part, 31 ... Volute case, 32 ... Fan, 34 ... Air intake, 52 ... Mesh shape Part, 53 ... duct part.

Claims (3)

A centrifugal blower having a volute case;
A frame having a gantry part on which the centrifugal blower is mounted;
An engine for driving a fan housed in the volute case;
A cover covering an air intake provided in the volute case;
A duct portion for communicating the inside and the outside of the mesh portion constituting the cover;
An end of the duct portion is extended and opened at a position away from the mesh portion. The engine blower according to claim 1, wherein
The engine blower, wherein the duct portion is integrally formed with the mesh portion or the volute case. The engine blower according to claim 1 or 2,
The frame base is located below the centrifugal blower,
The gantry is provided with an opening penetrating vertically.
An engine blower, wherein a tip of the duct portion is extended and opened in the opening.

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