JPH0338250Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention is an engine for collecting dust such as fallen leaves on the ground by sucking air from a dust collection fan that rotates by the engine. This relates to blowers.

(Prior art and problems to be solved) Conventionally, in this type of engine blower,
As shown in FIG.
Cooling was achieved by branching off the air outlet 39 and guiding it to the outer periphery of the cylinder 9 or to high-temperature parts of the engine such as the muffler 11. A dust collection container 53 is provided in the middle of the air intake passage 62, and a filter 57 separates and collects dust. However, when this filter 57 becomes clogged, the amount of air intake decreases, and at the same time, the engine cooling air is was also decreasing. However, when the amount of intake air decreases, the load becomes lighter and the engine rotational speed tends to increase, which sometimes causes the engine to seize.

[Structure of the idea]

(Means and effects for solving the problem) The present invention provides a dust collection fan on one side of the support plate and a cooling fan on the other side, and a dust collection air passage of the dust collection fan and a cooling air intake of the cooling fan. The airflow rate of the cooling fan will not decrease even if the filter becomes clogged and the airflow rate of the dust collection fan decreases, which prevents the engine from seizing up. .

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, the main case 3 made of synthetic resin that houses the engine 1 is divided by screws (not shown), which are divided along a plane including the center line in the longitudinal direction. are connected by. A cylinder 9 is fixed horizontally to the rear of the crankcase 7 with the crankshaft 5 in a vertical position, and a muffler 11 is provided above the cylinder 9. A carburetor 13 is mounted above the crankcase 7. A fuel tank 15 is housed in the upper part of the main body case 3, and a handle 17 is integrally provided above it. Main case 3
The inside consists of an engine chamber 19 that accommodates the engine 1, and a fan chamber 23 that is integrally formed below the engine chamber 19 with a partition wall 21 interposed therebetween. A disk-shaped support plate 27 having a plurality of radial dust collecting fans 25, 25, .
An annular wall 31 is integrally formed on the outer periphery of the upper surface of the support plate 27, and cooling fans 33,
33, . . . are provided so as to be covered by the annular wall 31. An air intake hole 35 is provided in the front side wall of the main body case 3 to communicate the atmosphere with the engine compartment 19, and an air intake port 37 is opened in the center of the partition wall 21 on the side of the air intake hole 35. 35, a cooling air intake path 38 is formed through which air is drawn into the cooling fan 33 through the air intake port 37. Further, an air outlet 39 is opened at a position inward from the annular wall 31 of the partition wall 21 and facing the cylinder 9. In addition, ventilation holes 4 are provided at appropriate positions on the main body case 3.
1 is provided, and a cooling air passage 43 is formed in which the cooling air blown from the air outlet 39 cools the cylinder and the like and then is discharged from the air exhaust hole 41.
The cooling air intake path 38 and the cooling air blowing path 43 may be provided with guide plates at appropriate positions to guide the air, if necessary. The outer circumferential wall 45 of the fan chamber 23 is formed in a spiral shape so as to gradually increase in size in the rotation direction, and a dust collection air passage 4 whose cross-sectional area gradually increases is formed between the outer surface of the annular wall 31 and the outer edge of the dust collection fan 25.
7 and communicates with the discharge port 49 . A suction port 51 is opened in the center of a side wall 50 on the lower surface of the fan chamber 23 and is removably connected to an opening 55 on the upper surface of the dust collecting container 53, and a mesh filter 57 is installed to cover the opening 55. There is. An air intake port 59 is opened at the front of the dust collecting container 53 and communicates with an air intake pipe (not shown) via a flexible tube 61. This suction pipe (not shown) passes through the flexible pipe 61, the dust collection container 53, and the filter 57, and then from the suction port 51 to the dust collection fan 2.
5. A dust collection air suction path 62 is formed.
A lid part 63 for discharging dust is fixed to the rear part of the dust collecting container 53.

In the above embodiment, when the dust collection fan 25 rotates due to the rotation of the engine 1, the operator grasps the air intake pipe (not shown) that communicates with the flexible tube 61 and starts from the tip of the air intake pipe. Suction of dust on the ground such as fallen leaves. This dust enters the dust collecting container, is filtered by a filter 57, and is collected in the dust collecting container 53.
The air filtered by the filter 57 is sent to the dust collection fan 2.
5, and passes through the dust collection air passage 47 to the discharge port 49.
is discharged from. Furthermore, due to the centrifugal force generated by the rotation of the cooling fan 33 and the inclination of the cooling fan 33, the air that has entered the center of the cooling fan 33 from the air intake port 35 is pressed against the inner surface of the annular wall 31, and It is pushed out to the air outlet 39 at the position 39. That is, the air enters the engine compartment 19 through the air intake holes 35, 35, is sucked into the cooling fan 33 through the air intake port 37, and is drawn into the cylinder 9 through the air intake port 39.
It cools the cylinder 9 etc. through the outer periphery of the cylinder 9, etc., and is discharged to the atmosphere from the exhaust port 41. That is, it passes through the cooling air passage 43 and is discharged into the atmosphere.
When the filter 57 becomes clogged, the amount of air blown through the dust collection air passage 47 decreases, but the rotation of the dust collection fan 25 does not decrease, so the amount of air blown by the cooling fan 33 decreases. Without a problem,
Seizing of the engine 1 does not occur. Note that, without removing the dust collecting container 53, it is also possible to blow dust such as fallen leaves on the ground using an air pipe (not shown) connected to the discharge port 49 via a flexible pipe.

[Effect of idea]

Since the present invention has the configuration as described in the claims, even if the filter on the intake side becomes clogged, the amount of cooling air for the engine does not decrease, and it is possible to prevent engine seizure. be. It also has a simple structure and can be made compact. Furthermore, since an annular wall is provided around the outer circumference of the cooling fan, in order to form an air passage that requires a large cross-sectional area, it is necessary to partition the spiral air passage around the outer periphery of the dust collection fan and the dust collection fan. There is no need to attach an annular partition wall to the main body case, so
The main body case can be divided at a dividing plane in the front-rear direction including the crankshaft, which reduces the number of parts and facilitates manufacturing.

Note that FIG. 3 shows a conventional example, in which a part of the air from the dust collection fan 25 is sent to the cylinder 9 from an air outlet 39.

In FIG. 3, the same reference numerals as those shown in FIG. 1 represent the same components.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the present invention, FIG. 2 is a plan sectional view of the main part, and FIG. 3 is a side sectional view of a conventional example. 1...Engine, 9...Cylinder, 21...
Partition wall, 25... Dust collection fan, 27... Support plate, 3
1... Annular wall, 33... Cooling fan, 37... Air intake port, 38... Cooling air intake path, 39... Air outlet, 4
3... Cooling air duct, 47... Dust collection duct, 49
... Discharge port, 50 ... Side wall, 51 ... Suction port, 6
2...Dust collection air passage.

Claims (1)

[Scope of utility model registration request] A disc-shaped support plate 2 that rotates by the engine 1
A dust collection fan 25 and a cooling fan 33 are fixed radially on one side of the dust collection fan 25 and a cooling fan 33 is provided on the other side of the dust collection fan 7, respectively, and the air sucked in from an intake port 51 provided at the center of the side wall 50 facing the dust collection fan 25 is provided. The dust collection fan 25 connects the dust collection air passage 47 for guiding the dust to the discharge port 49.
The cooling fan 33 is formed so that the cross-sectional area thereof gradually increases in the direction of rotation along the outer periphery of the cooling fan 33, and the air sucked from the air intake port 37 provided at the center of the partition wall 21 facing the cooling fan 33 is A cooling air passage 43 is provided which discharges the cooling air to the atmosphere through the outer periphery of the cylinder 9 from the air outlet 39 that opens in the partition wall 21 at the inner position of the annular wall 31 that covers the outer periphery of the fan 33 and is fixed to the support plate 27. An engine blower characterized in that a cooling air intake passage 38 of a cooling fan 33 is provided separately from a dust collection air intake passage 62 of the dust collection fan 25.