JPH0437644Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a small amount sprayer used for spraying a chemical solution onto agricultural crops in greenhouse cultivation and the like.

[Conventional technology]

In such small-volume sprayers, compressed air is sent from the compressor to the nozzle head, and when the compressed air is released from the nozzle cap of the nozzle head, the negative pressure generated at the nozzle tip in the nozzle cap sucks the chemical liquid from the chemical liquid tank. The chemical solution is mixed with compressed air and sprayed as a mist. Before starting spraying, pre-stir the chemical solution in the chemical tank,
Since it is necessary to test run the compressor and prime mover, conventional small-volume sprayers are equipped with a spraying tip that selectively connects the discharge side of the compressor to the jet head or atmospheric space, and during pre-stirring, compressed air from the compressor is used. It is released directly into the atmosphere.

[The problem that the idea attempts to solve]

With conventional small-volume spreaders, the compressed air from the compressor is released directly into the atmosphere.
As the compressed air is released into the atmosphere, the exhaust noise resonates in the pipes and becomes a loud noise, which is a nuisance to residents in residential areas near the house.

Furthermore, in the case of a trial run in which the same load as that used during compressor work is performed, it is necessary to connect to the compressor jet head, and the chemical liquid is sucked out from the chemical liquid tank.

The purpose of this invention is to provide a small volume spreader that can reduce noise during pre-stirring.

[Means to solve the problem]

This invention will be explained using reference numerals in the drawings corresponding to the embodiments.

The small amount sprayer on which this invention is based consists of a compressor 18 that generates compressed air, and a negative pressure generated at the tip of the nozzle 62 by ejecting the compressed air from the compressor 18 near the nozzle 62. A jet head 56 that sucks the chemical liquid in the chemical liquid tank 48 by pressure and ejects it from the nozzle 62;
A dispersion tank 28 selectively sends the compressed air from the compressor 18 to the atmospheric space or to the jet head 56.

In the small amount sprayer of this invention, an orifice 42 is provided on the atmospheric space side of the spraying pot 28.

[Effect]

During the spraying operation, compressed air from the compressor 18 is sent to the jet head 56 in the spraying tank 28 . As a result, the compressed air from the compressor 18 is ejected near the nozzle 62 to generate negative pressure at the tip of the nozzle 62. Chemical liquid tank 48
The chemical liquid inside is sucked out from the chemical liquid tank 48 by the negative pressure at the tip of the nozzle 62 and is ejected from the nozzle 62.

On the other hand, during pre-stirring, the compressed air from the compressor 18 is sent to the atmospheric space in the dispersing tank 28. As a result, the compressed air from the compressor 18 passes through the orifice 42, is appropriately throttled, and is then released into the atmosphere, reducing resonance and exhaust noise.

〔Example〕

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 4 shows the main body of a small amount sprayer, and an engine 10 as a prime mover has its intake air controlled by a throttle lever 12 and a choke lever 14, and is started by a recoil starter 16. The compressor 18 is driven by the engine 10 and generates compressed air by sucking air from the air filter 20, and this compressed air is sent to the jet connection port 22. A rubber hose 24 is connected to the jet head connection port 22, and a vinyl hose 26 is further connected to the rubber hose 24. The sparge tank 28 can connect the discharge side of the compressor 18 to atmospheric space, and the pressure gauge 30 measures the pressure of the compressed air at the discharge side of the compressor 18 . The switch 32 controls the supply of electricity to the outlet 34, into which a plug of a chemical tank agitator can be inserted.

FIG. 1 is a circuit diagram of compressed air and chemical liquid in a small amount sprayer. The dispersion pot 28 is a three-way valve type, and includes a compressor connection port 40 connected to the discharge side of the compressor 18 via an air tube 38, and an atmospheric connection port 44 connected to the atmospheric space via an orifice 42. It has a connection port 46 connected to the jet head connection port 22 described above via an air tube 47. Chemical liquid tank 48
The lower end of the siphon pipe 50 is located sufficiently close to the bottom of the chemical liquid tank 48, and the agitator 52 has a propeller 54 that stirs the chemical liquid in the chemical liquid tank 48. The jet head 56 has a nozzle 62 connected to the siphon pipe 50 via an orifice 58 and a silicon tube 60, and a nozzle cap 64 surrounding the tip of the nozzle 62. The space between the nozzle 62 and the nozzle cap 64 is filled with the aforementioned vinyl hose 26.
It is connected to the jet head connection port 22 via.

FIG. 2 illustrates the vicinity of the scattering pot 28 in detail. The lever 68 connects the compressor connection port 4.
0 is selectively connected to an atmospheric connection port 44 or a connection port 46. The blind plug 70 is connected to the orifice 42 described above.
is formed as a hole that communicates between the inside and outside, and is screwed into the atmospheric connection port 44. The air tube 47 is configured as an elbow and is screwed into the jet head connection port 22 and the connection port 46 at both ends, respectively.

The parts shown in FIG. 3 may be used in place of the blind stopper 70 shown in FIG. 2. The nipple 72 is screwed at one end into the atmospheric connection port 44 of the spreading pot 28;
A disk 76 having a gasket 74 and an orifice 42 is attached to the other end by a female threaded nut 78.

The operation of the embodiment will be explained.

When spraying a chemical solution, the compressor connection port 40 is connected to the connection port 46 in the spraying pot 28. As a result, compressed air from the compressor 18 is supplied to the nozzle head 56 via the dispersion tank 28, becomes a high-speed vortex within the nozzle cap 64, and is discharged into the atmosphere. At this time, since the tip of the nozzle 62 becomes a negative pressure, the chemical liquid in the chemical liquid tank 48 is sucked through the siphon pipe 50 and sucked out from the tip of the nozzle 62. The sucked-out chemical solution mixes with the high-speed swirling air in the nozzle cap 64, and then
It becomes smoke and is dispersed from the jet head 56.

During agitation of the chemical solution in the chemical solution tank 48 and during a test run, the compressor connection port 40 is connected to the atmosphere connection port 44 in the spraying tank 28 . As a result, the compressed air from the compressor 18 is not guided to the jet head 56, but is allowed to escape into the atmosphere via the atmospheric connection port 44 and the orifice 42 of the dispersion pot 28. Since the orifice 42 reduces resonance noise and exhaust noise within the piping, the noise when the compressed air is released to the atmosphere can be sufficiently reduced. Also, orifice 4
2 has a diameter selected so that almost the same load is applied to the compressor 18 as when spraying is performed with the jet head 56 connected to the jet head connection port 22.
A desired test run can be performed without connecting the jet head 56 to the jet head connection port 22. Therefore, if a malfunction occurs as a result of the trial run, the abnormality can be quickly and easily discovered and repaired. Furthermore, water droplets in the pressure gauge 30 and air tube 38 can be discharged from the connection port 44 of the spraying pot 28, and the compressor connection port 40 can be connected to the atmosphere connection port 4.
Pressure gauge 3 measures the pressure on the discharge side of compressor 18 when connected to connection port 4 and connection port 46, respectively.
0, and from the difference in pressure in both cases, clogging or wear of the nozzle head 56 can be determined, and the time to replace the nozzle head 56 can be known.

[Effects of the device] In this device, an orifice is provided on the atmospheric space side of the dispersing pot that selectively sends the discharge side of the compressor to the atmospheric space or the nozzle head. The compressed air is appropriately throttled in the orifice and then released into the atmosphere to reduce resonance noise and exhaust noise.

In addition, in the embodiment of this invention, the diameter of the orifice is selected to apply almost the same load to the compressor as when compressed air from the compressor is sent to the jet head, so the compressed air from the compressor is sent through the orifice. By discharging the compressed air into the atmosphere, a test run can be performed in which the compressor is subjected to almost the same load as during chemical spraying work, without sending compressed air to the jet head.

[Brief explanation of drawings]

The drawings relate to an embodiment of this invention; Fig. 1 is a circuit diagram of compressed air and chemical liquid in a small amount sprayer;
The figure is a detailed view of the vicinity of the dispersion pot in Figure 1, Figure 3 is a diagram showing parts that can be substituted for the blind stopper in Figure 2, and Figure 4 is a diagram showing parts that can be substituted for the blind stopper in Figure 2.
The figure is a perspective view illustrating the main body of the small amount spreader. 18...Completsa, 28...Scattered Kotoku,
42... Orifice, 48... Chemical tank, 56
...Full head, 62...Nozzle.

Claims (1)

[Claims for Utility Model Registration] (1) A compressor 18 that generates compressed air, and a nozzle 6 that directs the compressed air from the compressor 18.
By ejecting near the nozzle 2, negative pressure is generated at the tip of the nozzle 62, and this negative pressure sucks the chemical liquid in the chemical liquid tank 48, and the nozzle 6
2 and the compressed air from the compressor 18 to the atmospheric space or the jet head 5.
6. A small amount spreading machine comprising a scattering pot 28 for selectively sending the material to the air supply device 6, characterized in that an orifice 42 is provided on the atmospheric space side of the scattering pot 28. (2) The orifice 42 is connected to the compressor 1.
8 compressed air is sent to the nozzle 62 of the jet head 56.
2. The small-volume spreader according to claim 1, wherein the diameter is selected so as to apply almost the same load to the compressor 18 as when the compressor is being sent to the compressor.