JPS596911Y2 - Soundproofing device for backpack-type power exterminator - Google Patents

Description

[Detailed explanation of the invention] In conventional backpack-type power pest control machines, the air inlet of the blower is generally located on the back side, so it is close to the worker's ears, making it easier for the noise of the fan to reach the ears. Additionally, there was a problem in that the transmitted sound of the fan noise from the fan case, the chemical tank, etc. easily reached the ears of the worker.

In order to solve the above-mentioned problem, the present invention is characterized by extending the flat plate-shaped backpack frame or back rest (hereinafter referred to as the back rest) upwards, and forming a soundproof wall that covers the front side of the drug tank. , will now be explained with reference to the drawings.

In Figure 1, 1 is the engine, 2 is the blower, 3 is the backrest, 3
a is a cushioning material, 4 is a drug tank, and 5 is a soundproof wall newly provided according to the present invention.

The blower 2 includes a fan case 6 and a fan 7, and the fan case 6 is fixed to the crankcase of the engine 1 and mounted on a backpack frame 10 via rubber dampers 8 and 9.

The fan 7 is attached to the crankshaft 11 of the engine 1.

12 is an air suction port. Cushion material 3 on backpack frame 10
A flat plate-shaped back support 3 having a diameter is attached with a plurality of bolts.

The back support 3 is made of, for example, resin and is integrally formed with the soundproof wall 5.

The illustrated soundproof wall 5 is curved along the front part (left end in the figure) of the drug tank 4 at a slight interval, and extends to approximately the same height as the upper end of the drug tank 4.

E is the position of the worker's ear.

When the fan 7 is driven by the engine 1, air is sucked in from the suction port 12, and after being pressurized by the fan 7, a portion is supplied to the engine 1 from the opening 6a as cooling air, and most of the remaining air is inside the fan case 6. and is supplied to a drug dispersion nozzle (not shown).

On the other hand, the noise (wind noise, etc.) caused by the rotation of the fan 7 is
Although it is released into the atmosphere from the air intake river 2 through the opposite route to the intake air, the amount of noise that reaches the worker's ears E is greatly reduced by the back support 3 and the soundproof wall 5 on the -L side thereof. reduce

In addition, the noise of the engine 1 and chatter sounds of the fan case 6, chemical tank 4, etc. (including transmitted sound of fan noise, etc.) are also prevented by the soundproof wall 5.
is blocked by

As explained above, if the soundproof wall 5 is provided in the upwardly extended portion of the backrest 3, that is, in a position that covers the front side of the chemical tank 4, the soundproof wall 5 will be positioned exactly midway between the engine 1 and the worker's ear E. Therefore, fan noise and engine noise can be effectively blocked.

Furthermore, even if powder or liquid medicine is poured into the medicine tank 4, even if these medicines spill out from around the injection port, the soundproof wall 5 prevents the cushioning material 3 from hitting your back when you carry it on your back for work.
There is also the advantage that a does not get dirty.

Note that when embodying the present invention, the soundproof wall 5 may be flat like the backrest 3 (Figure 2).

However, if it is curved toward the chemical tank side as shown in Figures 1 and 2 A, it not only increases the soundproofing effect, but also increases the rigidity of the soundproofing wall and eliminates the risk of the soundproofing wall itself vibrating, which is advantageous. Providing a layer of sound absorbing material on the medicine tank 4 side of the soundproof wall 5 further improves the sound deadening effect.

Furthermore, the left and right edges of the backrest 3 are curved to form 5' in FIG.
If the surrounding surface of the fan case 6 is covered as shown in
This has the advantage of increasing the sound insulation effect and increasing the strength of the soundproof wall.

Of course, there is a soundproof wall formed separately from the back support 3 and the back support 3 or the back frame 1.
There is no problem even if it is fixed to 0.

The soundproof wall 5 can also be made of a light alloy or other metal plate.

[Brief explanation of drawings]

FIG. 1 is a partially vertical side view of a backpack-type power pest control machine to which the present invention is applied, and FIG. 2 is a partial cross-sectional view taken along line II--II of FIG. 1 and a modified example thereof. 1...Engine, 2...Blower, 3.
...back support, 4...medicine tank, 5...
...Soundproof wall.

Claims (1)

[Scope of utility model registration request] In backpack-type power exterminators that are equipped with a blower and a backrest in sequence on the front side of the engine, and a chemical tank above the engine, the backrest is extended upward to form a soundproof wall that covers the front side of the chemical tank. A soundproofing device characterized by: