JPH055964Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a backpack-type blower device for performing work such as spraying chemicals using a blower attached to a backpack frame.

Conventionally, in this type of backpack-type blower, the engine that drives the blower was fixed to the center of the back of the blower attached to the backpack frame, but the fuel tank was attached above the engine, and the float type The fuel was supplied to the carburetor by gravity. This has the disadvantage that the center of gravity is high, making it difficult to carry out work.Furthermore, if excess fuel is spilled when filling the fuel tank or when starting, it may spill onto the engine and cause a fire due to the heat of the engine. There was a risk that if it caught fire after being carried on one's back, it could lead to a serious accident that could result in personal injury. Generally, the blower is larger than the engine, so if the engine is attached coaxially to the blower, a space will be formed below the engine, but the present invention utilizes this space to move the fuel tank to the bottom of the engine. It is installed between the fuel tank and the horizontal part of the backpack frame, and an overflow pipe is installed to return excess fuel supplied to the carburetor by the manual pump to the fuel tank, thereby lowering the center of gravity and making work easier. In addition, the present invention aims to provide a backpack-type blower that can prevent fuel from splashing on the engine and eliminate the occurrence of fire.

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

In the figure, reference numeral 1 indicates a backpack-type blower device for a chemical sprayer, which is constructed as follows.
That is, 3 is a blower that has a built-in fan (not shown) that is rotated by the drive of the engine 5. The engine 5 is fixed coaxially at the center of the rear surface, and the drug tank 7 is attached to the screws 9, 9 at the top. It is fixed in place. 11 is a muffler cover that covers the engine 5 muffler (not shown); 13 is an intake cover that covers the carburetor 15 and the air cleaner 17; 19 is a spark plug;
1 is a recoil starter, 23 is a shutter lever, and 25 is a throttle lever. 27 is a fuel tank installed in a space formed between the lower surface of the engine 5 and the horizontal part of the backpack frame 31, which will be described later;
29 is an injection port. 31 is a backpack frame for supporting the blower 3, 33 is a back rest, and 35 is a backpack band whose both ends are secured to the upper and lower parts of the backpack frame 31, respectively. The vaporizer 15 is constructed as follows. That is, 37 is the air passage 39 of the carburetor 15.
A throttle valve 41 that opens and closes the air passage 39 is a needle valve that adjusts the area of the nozzle port 43 that opens into the air passage 39, and is locked to the throttle valve 37. The air passage 39 communicates an intake port (not shown) of the engine 5 with the air cleaner 17. 45 is a fuel chamber, which communicates with the nozzle port 43 via a control valve 47;
Also, a needle valve 49, a diaphragm pump 51,
It communicates with the fuel tank 27 via a fueling hose 53. 55 and 57 are check valves of the diaphragm pump 51, and 59 is a pressure chamber for operating the diaphragm pump 51, which communicates with the crankcase (not shown) of the engine 5 to repeat positive and negative pressure fluctuations.
61 is a pump chamber behind the manual pump 63 made of rubber, and is connected to the fuel chamber 45 via a check valve 65 and an on-off valve 67.
is connected to. 69 is an overflow pipe that communicates with the pump chamber 61 and the fuel tank 27 via the check valve 71. Reference numeral 73 is a starter taker which, when pushed upward, opens the on-off valve 67 and the needle valve 49 via the lever 75. 77 is a diaphragm that interlocks with the takeler 73.

In the embodiments described above, the worker places the backrest 33 on his back and carries the backpack frame 31 on his back using the backpack band 35, and the blower 3 rotates by the engine 5.
A hose (not shown) that mixes the medicine in the medicine tank 7 into the air generated by the air and connects it to the air pipe.
Spread the drug through.

When starting the engine 5, by repeatedly pushing and releasing the manual pump 63, the pressure in the fuel chamber 45 decreases, and fuel flows from the fuel supply hose 53 through the diaphragm pump 51 and the needle valve 49 into the fuel chamber. 45. When the fuel chamber 45 is filled with fuel, it is returned to the fuel tank 27 via the overflow pipe 69 and does not overflow to the outside. For starting when the fuel chamber 45 is filled with fuel, it is only necessary to operate the takeler 73.
When the engine 5 rotates, the diaphragm pump 5
1, fuel is automatically sent to the fuel chamber 45 and is atomized and mixed into the intake air in the air passage 39 from the nozzle port 43. Also fuel tank 2
7 is located below the engine 5, even if it overflows when injecting from the inlet 29, it will not hit the engine 5.

Since the present invention has the configuration as described in the claims, it is possible to lower the height of the center of gravity, make work easier, eliminate the danger of fire, and prevent serious accidents.

[Brief explanation of drawings]

1 and 2 are a side view and a front view of one embodiment of the present invention, respectively, and FIG. 3 is a front cross-sectional view of the main part. Explanation of symbols representing main parts of the drawings, 3... Blower, 5... Engine, 15... Carburetor, 27...
...Fuel tank, 31...Back frame, 63...Manual pump, 69...Overflow pipe.

Claims (1)

[Scope of utility model registration request] An engine 5 for driving the blower 3 is fixed to the center of the rear surface of the blower 3 attached to the backpack frame 31, and the lower surface of the engine 5 and the backpack frame 31 are connected to each other.
A fuel tank 27 is installed in the space formed between the horizontal part of the fuel tank 27 and the carburetor 15, and a diaphragm pump 51 that operates based on pressure fluctuations in the crankcase during engine operation supplies fuel from the fuel tank 27 to the vaporizer 15. A refueling hose 53 is provided to supply the fuel chamber 45 to the fuel chamber 45 when the engine is started.
A manual pump chamber 61 is provided which communicates with the fuel chamber 45 via a check valve 71 so that the manual pump 63 supplies fuel to the carburetor 15.
The manual pump chamber 6 is configured to return excess fuel supplied to the fuel chamber 45 to the fuel tank 27.
1 and the inside of a fuel tank 27.