JPH0437642Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a static electricity removal device that removes static electricity generated when a spraying agent is pumped in a power spreader.

[Conventional technology]

A conventional example of a static electricity removing device for a power spreader will be explained with reference to FIG. Backpack power spreader 10
is equipped with a blower 12 at the bottom, and the blower 12 includes a resin fan case 14 and the fan case 1.
4 and driven by an engine (not shown), and a scroll-shaped ventilation passage 18 formed outside the impeller 16 in the radial direction. The bent pipe 20 is the ventilation passage 1
It is rotatably coupled to the fan case 14 so as to communicate with the downstream end of the fan case 8 , and has a discharge port 22 .
A jet pipe (not shown) is connected to the downstream end of the bent pipe 20. The storage tank 24 is placed and fixed on the upper part of the fan case 14, and contains powdered and granular spraying agents 26. The damper valve 28 is movable in the vertical direction by manual operation.
4, and adjusts the flow rate of the spraying agent 26 at the opening. Pressure passage 30
is formed inside the fan case 14, and the air passage 1
It branches from the middle of 8 and reaches an opening at the bottom of the storage tank 24. The pressurizing pipe 32 extends in the vertical direction and introduces the pressurized air in the ventilation passage 18 into the space in the fan case 14 above the dispersing agent 26.
The discharge pipe 34 made of resin is disposed inside the fan case 14 , communicates with the opening at the bottom of the storage tank 24 at its upper end, opens near the bent pipe 20 at its lower end, and directs the dispersing agent 26 toward the bent pipe 20 . lead to.

Pressurized air is generated in the air passage 18 by the rotation of the impeller 16, and this pressurized air is sent to the discharge port 22 through the air passage 18, and a part of the pressurized air flows through the pressurized pipe 32. Via backpack power spreader 10
The spraying agent 26 is guided to the upper part of the damper valve 2.
8 is pressed downward, and the other part is guided to the opening at the bottom of the storage tank 24 via the pressurizing passage 30, and then entrains the spraying agent 26 to the discharge pipe 34. As a result, the spraying agent 26 is force-fed from the discharge port 22 by the pressurized air. When the dispersing agent 26 passes through the discharge pipe 34, jet pipe, etc., the dispersing agent 26 and the walls thereof
Friction occurs between each particle of the dispersing agent 26 and between each particle of the dispersing agent 26,
The wall surface and the spray agent 26 are electrically charged. (Generally, the wall surface is negatively charged and the spray agent 26 is positively charged, and the charged voltage may reach 50 kV or more.) Furthermore, static electricity is also generated when the engine is operated.

Current collector plate 36 as an element of the static electricity eliminator
is fixed to the inner surface of the bent pipe 20 with a screw 38, and connected to a charging portion such as a discharge pipe 34 and a jet pipe. The ground wire 40 is connected to the current collecting plate 36 via the screw 38 at one end, and connected to the ground directly or through the human body at the other end. In this way, the static electricity charged in the charged parts such as the discharge pipe 34 and the injection pipe is collected on the current collecting plate 36, and then released to the ground via the ground wire 40.

[Problems to be solved by the invention] In the conventional static electricity eliminator, when the ground wire 40 is in direct contact with the ground, the ground wire 40 becomes long, which makes it difficult to carry the power spreader 10 on your back or when spreading the spraying agent 2.
6. During spraying, the ground wire 40 may get in the way, and the ground wire 40 may be cut, or the worker may catch the ground wire 40 on his feet or crops and fall, which can be dangerous.

When the ground wire 40 is connected to the human body, depending on the footwear worn by the worker, the ground may be incomplete and electrical discharge may occur between the human body and the ground wire 40 or between the ground and crops, etc. There is.

The purpose of this invention is to provide a static electricity removal device for a power spreader that can omit a ground wire.

[Means to solve the problem]

According to this invention, in a sprayer in which the spray agent in the storage tank is compressed and sprayed by a blowing means,
The blowing means includes an impeller driven by a prime mover;
The fan is formed of a housing that guides the pressurized air generated by the rotation of the impeller to the discharge port, and a positive electrode and a negative electrode are attached to the inner peripheral edge of the housing. One end of one of these electrodes is connected to the power source of the prime mover via a wire, thereby dissipating the static electricity generated inside the machine due to the rotation of the prime mover.

[Operation] When the voltage applied between the positive electrode and the negative electrode from the power supply becomes equal to or higher than a predetermined value, a discharge occurs between the positive electrode and the negative electrode. Along with this discharge, positive and negative ions are generated in the air, and the ions are carried downstream by the pressurized wind.As mentioned above, when the spraying agent is transported by the pressurized wind, the spraying agent Friction occurs between the spray agent and the wall surface of the passage, and the spray agent and the wall surface are electrically charged. The ions carried by the pressurized air come into contact with charges of opposite sign on the spray agent and the wall surface, and neutralize these charges.

[Example] This invention will be described below with reference to an example shown in the drawings. Note that the explanation of the elements already explained in FIG. 5 regarding the conventional example will be omitted, and only the differences will be explained.

FIG. 1 is an overall view of a backpack power spreader 10 equipped with a static electricity removing device according to this invention, in which an ion generator 42 is disposed within the upstream end of the ventilation passage 18.

FIG. 2 is a detailed diagram of the ion generator 42,
The ion generator 42 includes positive electrodes 4 facing each other.
4 and a negative electrode 46, the negative electrode 46 and the positive electrode 44 are attached to the wall surface of the ventilation passage 18 at both ends. In the illustrated embodiment, the positive electrode 44 is formed in the form of a flat plate, and the negative electrode 46 has a plurality of protrusions projecting toward the positive electrode 44. Positive electrode 4
4 and the negative electrode 46 may have any shape, such as a needle shape or a linear shape. The electric wires 48, 48 are connected to the positive electrode 44 and the negative electrode 4.
6 is connected to an external power source (described later) of the fan case 14.

FIG. 3 shows an embodiment of the power supply circuit of the ion generator 42. In FIG. The power generation coil 50 includes an impeller 16
An induced voltage is generated along with the rotation of a magnet that is disposed radially outside an output shaft (not shown) of an engine that drives the engine and rotates integrally with the output shaft. The ignition unit 52 includes a breaker that opens and closes in synchronization with the rotation of the output shaft of the engine. The ignition coil 54 has a primary coil 56 and a secondary coil 58, and the primary coil 56 is connected to the generator coil 50 via the ignition unit 52. spark plug 6
0 is attached to the engine so that the discharge gap faces the combustion chamber of the engine that drives the impeller 16, and is connected to the secondary coil 58. The generator coil 50 or the spark plug 60 are already installed in the backpack power spreader 10 as an ignition device for the engine. The ion generator 42 is connected in parallel to the spark plug 60. In this way, a voltage equal to the voltage applied to the discharge gap of the spark plug 60 is also applied between the positive electrode 44 and the negative electrode 46, and a discharge occurs between the positive electrode 44 and the negative electrode 46.

FIG. 4 shows another embodiment of the power supply circuit of the ion generator 42. In FIG. The high voltage generation circuit for the ion generator 42 is provided separately from the high voltage generation circuit for the spark plug 60. The ignition unit 62 includes a breaker that opens and closes in synchronization with the output shaft of the engine, and the ion generation coil 64 is connected to the ignition unit 6.
The primary coil 66 is connected to the power generation coil 50 via the ion generator 2, and the secondary coil 68 is connected to the ion generator 42. As the breaker of the ignition unit 62 opens, a high voltage is applied between the anode 44 and the cathode 46 of the ion generator 42.
Discharge occurs during 6 hours. In this power supply circuit, a voltage different from that applied to the ignition plug 60 can be applied to the ion generator 42 at different timings.

The operation of the static electricity eliminator according to the embodiment will be explained. Positive electrode 44 in ion generator 42
When a discharge occurs between the negative electrode 46 and the negative electrode 46, positive and negative ions are generated in the air. The positive and negative ions are transported downstream through the air passage 18 by pressurized air generated by the rotation of the impeller 16. On the other hand, the storage tank 24 by pressurized air
As the spraying agent 26 is transported from the
Friction occurs between the discharge pipe 34 and the wall surfaces of the jet pipe, etc., and between each particle of the spraying agent 26, and static electricity is generated on these wall surfaces. The positive and negative ions carried downstream by the pressurized wind come into contact with the passage wall surface and the particles of the spraying agent 26, neutralize the electrical charge, and prevent static electricity from accumulating in various parts of the backpack power spreader 10. prevent.

[Effect of idea]

As described above, according to this invention, a positive electrode and a negative electrode are disposed in the pressurized air passage, and a discharge is caused between the positive electrode and the negative electrode, thereby generating ions in the air. The ions are transported by pressurized air, and the pressurized air is brought into contact with the wall surface of the passage of the spraying agent, and the static electricity on the wall surface of the passageway of the spraying agent is neutralized by the ions due to friction with the spraying agent. As a result, static electricity is prevented from accumulating on the wall surface, and discharge between the power spreader and the human body can be prevented.

In this invention, by arranging the positive electrode and the negative electrode within the blowing means, it is possible to prevent static electricity from flowing through the human body and to omit a long ground wire.
Therefore, it is possible to eliminate the problem of a long ground wire getting in the way or being cut during spraying work, and also to prevent the human body and the ground wire from being disconnected due to incomplete grounding due to the insulation properties of footwear, etc. It is possible to prevent electrical discharge from occurring between the ground wire and crops, etc.

[Brief explanation of drawings]

Figures 1 to 4 relate to embodiments of this invention; Figure 1 is an overall view of a backpack power spreader equipped with a static electricity eliminator according to this invention; Figure 2 is a sectional view taken along the - line in Figure 1; , FIG. 3 is a power supply circuit diagram of the ion generator, FIG. 4 is another power supply circuit diagram of the ion generator, and FIG. 5 is a diagram illustrating a backpack power spreader equipped with a conventional static electricity removal device. 10...Backpack power spreader, 12...Blower (air blowing means), 14...Fan case (housing), 16...
... impeller, 22 ... discharge port, 24 ... storage tank, 26 ... dispersing agent, 42 ... ion generator,
44... Positive electrode, 46... Negative electrode, 48... Electric wire (striatum), 50... Generating coil (power source).

Claims (1)

[Scope of utility model registration request] In a sprayer that force-feeds and sprays the spray agent in the storage tank 24 using a blowing means 12, the blowing means 12 is replaced with an impeller 16 driven by a prime mover;
It is formed from a housing 14 that guides the pressurized air generated by the rotation of the impeller 16 to the discharge port 22, and a positive electrode 44 and a negative electrode 46 are attached to the inner peripheral edge of the housing 14. , 46, one end of which is connected to the power supply 50 of the prime mover via the filament 48, and the static electricity eliminator for the power spreader is configured to eliminate static electricity generated inside the machine by rotation of the prime mover. .