JPH0317956Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a portable sprayer used for spraying agricultural chemicals and the like.

[Background of the idea]

Conventionally, in sprayers that spray a fixed amount of spray liquid by reciprocating a piston, there is a known sprayer that can spray both when the piston moves forward and backward, increasing the spray efficiency (for example, in practice Publication number 42891 (1972), Utility Model Publication 1977
-Refer to Publication No. 123980).

However, the above-mentioned conventional atomizer has disadvantages such as a relatively complicated structure, a large number of parts, troublesome assembly work, and an increase in the size of the atomizer as a whole.

[Purpose of invention]

This idea was developed against the background of the above-mentioned circumstances, and aimed to provide a relatively compact sprayer that enables spraying even when the piston is reciprocating, has a simple structure, is easy to assemble, and is relatively compact. be.

[Key points of the idea]

In order to achieve the above objectives, this invention provides a cylinder chamber and a valve chamber inside the main pipe placed in the holder, a piston is inserted into the cylinder chamber so as to be able to reciprocate, and a A main valve that opens when the piston is pushed back is arranged,
Moreover, between the walls of the main pipe and the holder, there is a liquid guide path for introducing the spray liquid in the spray container into the cylinder chamber from the tip side via a suction valve, and a valve for introducing the spray liquid in the cylinder chamber from the rear end side to the tip side. The piston is formed by separating the communication path into the room with a gasket, and the piston is provided with a valve portion that closes when the piston moves forward and opens when the piston moves backward, so that the spray liquid is sprayed both when the piston moves forward and backward. This is what I did.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

The holder 1 is made of synthetic resin and has a substantially cylindrical shape, and a mounting part 2 and a reinforcing grip part 3 are integrally molded at the lower part of the holder 1. The attachment part 2 is detachably attached to the mouth part 4a of the spray container 4, and has a suction valve 6 provided therein, and a valve seat 6a of the suction valve 6 to which the spray container 4 is attached.
A suction tube 7 is attached to suck the spray liquid inside.

Further, a main pipe 8 is arranged within the cylindrical interior of the holder 1 with a predetermined play. That is, the leading end (left side in the figure) and rear end (right side in the figure) of the main pipe 8 protrude outward from both sides of the holder 1, and fixing fittings 9 and 10 are attached to these protruding parts. It is loosely fitted into the holder 1 by fixing fittings 9 and 10.
Further, the main pipe 8 has a cylinder chamber 11 formed therein and a valve chamber 12 formed at the distal end thereof, and a nozzle 13 is attached to the distal end thereof by a fastening fitting 14.

A piston 1 is disposed in the cylinder chamber 11 of the main pipe 8.
5 is inserted. This piston 15 reciprocates within the cylinder chamber 11, and the shaft 1
A valve portion 17 is provided inside the piston 15 . This valve part 17 is formed in the piston 15 and has a valve hole 17a that communicates with the front end side and the rear end side of the cylinder chamber 11.
A valve ball 17b is arranged inside, and the valve ball 17b closes the valve hole 17a when the piston 15 moves forward to be pulled out, and the valve ball 17b opens the valve hole 17a when the piston 15 moves back to be pushed in. There is.
Note that the shaft 16 with the piston 15 attached to the tip passes through the cylinder chamber 11 and is connected to the fixing fitting 10.
A handle 16a is attached to this protruding portion. In this case, the fixing fitting 10 includes a gasket 18a and an O-ring 18 to prevent the spray liquid in the cylinder chamber 11 from leaking backward.
b is provided.

Further, the valve chamber 12 of the main pipe 8 is located between the cylinder chamber 11 and the nozzle 13 on the tip side, through which the spray liquid in the cylinder chamber 11 is sent to the nozzle 13, and a cylindrical member 19 is inside the valve chamber 12. A main valve 20 is also provided. The main valve 20 is biased by a coil spring 21 provided in the cylindrical member 19, closes the communication hole 12a between the cylinder chamber 11 and the valve chamber 12, and closes the communication hole 12a between the cylinder chamber 11 and the valve chamber 12, and
During the return movement, it opens against the coil spring 21.

On the other hand, between the walls of the main pipe 8 and the holder 1,
a liquid guiding path 22 that sends the spray liquid in the spray container 4 into the cylinder chamber 11 from the tip side through the suction valve 6;
The gasket 2 is connected to a communication passage 23 that sends the spray liquid in the cylinder chamber 11 from the rear end side to the valve chamber 12 on the front end side.
It is partitioned and formed by 4. in this case,
The main pipe 8 and the holder 1 are constructed as shown in FIGS. 2 to 4. That is, as shown in FIGS. 2 and 3, a recessed seat 1a is provided on the inner bottom surface of the holder 1 from the rear end to the vicinity of the front end. Further, a convex portion 8a that fits into the seat 1a of the holder 1 is formed at the bottom of the main pipe 8;
As shown in Figures 2 and 4, the bottom of a
A groove 8b forming the liquid guide path 22 is provided in the center thereof, and a groove 8c for attaching a packing 24 that partitions the liquid guide path 22 and the communication path 23 is provided surrounding this groove 8b. Therefore, the liquid guide path 22 connects the seat 1a of the holder 1 and the convex portion 8a of the main pipe 8.
The rear end is connected to the suction pipe 7 via the suction valve 6.
The distal end portion communicates with the distal end side of the cylinder chamber 11 via a hole 8d formed in the main pipe 8.
Further, the communication path 23 is formed between the inner wall of the holder 1 and the outer wall of the main pipe 8, and its rear end is connected to the main pipe 8.
The cylinder chamber 1 is inserted through the hole 8e formed at the rear end.
The main pipe 8 is connected to the rear end side of the main pipe 8, and the distal end thereof is communicated to the valve chamber 12 via a hole 8f formed at the distal end side of the main pipe 8. In addition, there are O-rings 2 at the front and rear of the main pipe 8.
6, 27 are provided, and this O-ring 26,
27 prevents the spray liquid flowing through the communication path 23 from leaking to the outside of the holder 1.

Next, the operation of the sprayer configured as described above will be explained.

First, attach the mounting part 2 of the holder 1 to the mouth part 4a of the spray container 4, grip the grip part 3 or the mounting part 2 with one hand, and hold the handle 1 of the shaft 16 with the other hand.
When 6a is pulled, the piston 15 attached to the tip of the shaft 16 moves within the cylinder chamber 11 from the tip side to the rear end side (backward movement). At this time, the valve hole 17a of the valve portion 17 provided in the piston 15 is closed by the valve ball 17b, so that the piston 15 is closed.
5, the tip side in the cylinder chamber 11 becomes negative pressure. As a result, the suction valve 6 in the mounting part 2 opens, and the spray liquid in the spray container 4 is sucked up into the suction pipe 7 and introduced into the liquid guide path 22 in the wall of the holder 1 and the main pipe 8 through the suction valve 6. At the same time, the liquid is sent into the cylinder chamber 11 from the tip side through the liquid guide path 22, and the cylinder chamber 11 is filled.

When the shaft 16 is pulled and then pushed back, the piston 15 creates positive pressure in the cylinder chamber 11, closes the suction valve 6, and closes the valve chamber 12.
The main valve 20 opens against the coil spring 21. Then, the spray liquid in the cylinder chamber 11 is pushed out by the piston 15 into the valve chamber 12, and the nozzle 1
It is sprayed from 3. In this case, the piston 15
Since the inner valve portion 17 opens simultaneously with the pushing operation of the shaft 16, a part of the spray liquid in the cylinder chamber 11 flows into the rear end side of the cylinder chamber 11 through the valve hole 17a of the piston 15.

After that, when the shaft 16 is pulled again, the spray liquid in the spray container 4 is introduced into the cylinder chamber 11 from the front end side as described above, and when the shaft 16 is pushed in, it flows into the rear end side of the cylinder chamber 11. The spray liquid is pressurized by the piston 15 and sent from the rear end side of the cylinder chamber 11 to the communication path 23 formed between the wall surface of the holder 1 and the main pipe 8, and passes through this communication path 23 to the valve chamber 12 on the tip side. pushed inside,
It is sprayed from the nozzle 13.

However, in the above-described sprayer, the spray liquid can be sprayed both when the shaft 16 is pulled out and pushed in, and the spray efficiency can be increased. Further, the above-mentioned sprayer has a simple structure and a relatively small number of parts, so that the entire sprayer can be constructed compactly. In particular, when assembling, the piston 15 attached to the tip of the shaft 16 is inserted into the cylinder chamber 11 of the main pipe 8, the main valve 20 is placed in the valve chamber 12 of the main pipe 8, and the main pipe 8 is Packing 24 on the outer periphery
and O-rings 26 and 27 are installed, and after this,
It is only necessary to loosely fit the main pipe 8 into the holder 1 from the rear end side and to securely hold the front end and rear end thereof with the fixing fittings 9 and 10, making the assembly work extremely easy.

[Effect of idea]

As explained above, according to the sprayer of this invention, it is possible to spray both when the piston moves forward and backward, but the structure is relatively simple, the number of parts is small, and the assembly work is easy. This has advantages such as the ability to make the entire sprayer compact.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the sprayer according to this invention, Figure 2 is a sectional view of the sprayer according to this invention.
3 is a sectional view showing the bottom inside the holder, and FIG. 4 is a bottom view of the main pipe. 1... Holder, 4... Spray container, 6... Suction valve, 8... Main pipe, 11... Cylinder chamber, 12...
Valve chamber, 13... Nozzle, 15... Piston, 17
... Valve part, 20 ... Main valve, 22 ... Liquid guide path, 23
...Connection route, 24...Patsukin.

Claims (1)

[Scope of utility model registration request] A main pipe is arranged in a holder attached to the spray container, and a valve chamber communicating with a cylinder chamber and a tip nozzle is provided inside the main pipe, and a piston is fitted into the cylinder chamber so as to be able to reciprocate. A main valve that opens when the piston is pushed back is disposed, and the piston is provided with a valve portion that closes during the forward movement and opens when the piston moves backward, and the spray liquid in the spray container is disposed between the wall surfaces of the holder and the main pipe. By forming a liquid guide path that sends the liquid into the cylinder chamber from the tip side through the suction valve and a communication path that sends the spray liquid in the cylinder chamber from the rear end side into the valve chamber on the tip side with a packing, the above-mentioned When the piston is pulled out, the valve part of the piston closes,
Introducing the spray liquid in the spray container into the cylinder chamber from the tip side through the liquid guide path, and at the same time feeding the spray liquid in the cylinder chamber from the rear end side through the communication path into the valve chamber on the tip side and spraying from the tip nozzle, When the piston is pushed back, the main valve in the valve chamber opens, and the spray liquid in the cylinder chamber is sent into the valve chamber and sprayed from the tip nozzle.At the same time, the valve part of the piston also opens and a part of the spray liquid is sent to the tip in the cylinder chamber. A sprayer characterized in that the spray is sent from the side to the rear end side.