JPH0422858Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a portable sprayer used for spraying solutions such as agricultural chemicals.

[Prior Art] Generally, a sprayer used as a portable device performs a spraying operation by manually reciprocating a piston. In order to increase spray efficiency, there is a structure that allows spraying both when the piston moves forward and when it moves backward (for example, Utility Model Application No. 50-42891).

However, in conventional sprayers that spray in each direction of the reciprocating movement of the piston,
The structure is extremely complex, and failures are relatively common. Further, these structures have problems such as relatively troublesome assembly and disassembly work due to the large number of parts, and high costs.

[Problems to be solved by the invention] In view of the above-mentioned problems, this invention maintains the spray during each reciprocating operation of the piston, and furthermore, the structure is extremely simplified and the number of parts is reduced. It is an object of the present invention to provide a sprayer that is easy to reduce and assemble, reduces weight and costs, and at the same time prevents the occurrence of failures.

[Means for Solving the Problems] In order to achieve the above object, this invention prevents the solution sucked into the cylinder space during both the forward movement of pulling out the piston and the return movement of pushing the piston. The solution is transferred to the first flow passage behind the piston via a check valve disposed on the piston, and is forced to the nozzle side through a second flow passage linked with the first flow passage. Therefore, the return flow path when the piston moves backwards also serves as the spray flow path during the forward movement to pull out the piston, which eliminates the need for a secondary piston and reduces the number of flow path switching valves, resulting in a reduction in the number of parts. It was planned.

[Function] According to the above, the check valve 11 disposed in the piston 5 portion closes the first flow path 14 from the cylinder space 9 side when the piston moves back, depending on the size of its valve hole 12 or through hole 13. The flow rate flowing into the side is determined. By balancing this flow rate with the amount of spray during forward movement of the piston, uniform spraying is achieved during each reciprocating operation.

[Example] This invention will be described below based on an example shown in the drawings.

In FIGS. 1 and 2, reference numeral 1 indicates a spray section that can be attached to the tank 2.
The piston 5 is attached to the tip of a piston rod 4 that is integrated with the handle 3, a cylinder member 6 into which the piston 5 is slidably fitted, and a holder member 7 which holds the cylinder member 6 by inserting it therein.
A spray nozzle member 8 inserted into the distal end side of the cylinder member 6, a suction pipe 10 communicating with the cylinder space 9 side, and the like are provided.

In the above, the piston 5 portion is further provided with a check valve 11 and a valve hole 12, and the check valve 11 prevents the solution in the cylinder space 9 from flowing into the valve hole 12 when the piston 5 is pushed. In this case, the solution passes through the through hole 13 and reaches the first flow path 14 side.

In the illustrated case, the first flow passage 14 is constituted by a space between the inner circumferential surface of the cylinder member 6 and the outer circumferential surface of the piston rod 4, with which the piston 5 is slidably fitted.

The first flow path 14 communicates with the second flow path 16 through a through hole 15 provided further to the rear.

The second flow path 16 is configured by a gap between the cylinder member 6 and the holder member 7, and is formed by a gap between the cylinder member 6 and the holder member 7.
It communicates with the nozzle member 8 side through a through hole 17 located at the tip side.

On the other hand, a passage 19 surrounded by an O-ring 18 communicates with the cylinder space 9 through a suction pipe 10 and a suction valve 20 on the side of the cylinder space 9, which has a compression effect when the piston 5 pushes forward and a suction effect when the piston retreats. ing.

FIG. 3 shows a passage 19 surrounded by an O-ring 18.
Fig. 4 shows the cross section of each passage in the section.
The configuration of the flow path 14 and the second flow path 16 is shown.

FIG. 5 shows the external appearance of the cylinder member 6 showing the O-ring 18 and its passage 19.

Next, handling of the sprayer with the above configuration will be explained.

First, in the state shown in FIG.
Pull out in the forward direction.

At this time, the cylinder space 9 side becomes negative pressure, the check valve 11 is closed, and the suction valve 2 on the suction side is closed.
0 is opened and the solution in the tank 2 is sucked into the cylinder space 9 through the suction pipe 10. In this case, the cylinder space 9 side becomes a wide space as the piston 5 moves rightward.

On the other hand, in the above movement of the piston 5, the solution that had been staying in the space on the right side of the piston, the so-called first flow path 14, is forced to the second flow path 16 side due to the closure of the check valve 11. As a result, the solutions that had been staying in the first flow path 14 and second flow path 16 areas are sent from the through hole 17 to the nozzle member 8 side and are sprayed.

Next, when the piston 5 is moved back in the pushing direction by the return movement of the handle, the check valve 11 opens and the suctioned solution flows into the first flow path 14 through the valve hole 12 and the through hole 13. be done. This influx is
As the piston 5 pressurizes the cylinder space 9 side, the solution is sent out from the second flow path 16 to the nozzle member 8 side and sprayed in the same manner as described above.

Note that the suction valve 20 at this time is in a closed state.

Therefore, by repeating the reciprocating operation of the handle 3, spraying can be performed each time the piston moves forward and backward.

In the above, the illustrated case shows a structure in which the spray section 1 can be attached to and detached from the tank 2, but the tank 2 side may be an appropriate liquid storage section or an appropriate liquid supply section. It may also be inserted directly into the suction tube 10 into a suitable container.

Also, the positions of the suction valve 20 and the suction pipe 10 are
In addition to what is shown in the drawings, for example, a check valve 20 may be installed in the cylinder space 9 position of the spray section 1 in direct communication with the check valve 20 .

[Effects of the invention] The sprayer of this invention is configured as described above, so that the structure for suction and discharge of the solution sent to the nozzle side can be set extremely simply. In addition, since the number of parts is reduced compared to conventional products, disassembly and assembly work during assembly or maintenance are extremely easy, and it can greatly contribute to the miniaturization and weight reduction of equipment as well as cost reduction. .

[Brief explanation of drawings]

Figure 1 is a side view of this invention showing the main parts in cross section, Figure 2 is an enlarged cross-sectional view of the main parts, and Figure 3 is a cross-sectional view showing the main parts.
Figure 4 is the - line shown in Figure 1, respectively.
FIG. 5 is a cross-sectional view taken along the - line, and a perspective view showing the external appearance of the cylinder member. DESCRIPTION OF SYMBOLS 1... Spraying part, 2... Tank, 4... Piston rod, 5... Piston, 6... Cylinder member,
7... Holder member, 8... Nozzle member, 9... Cylinder space, 10... Suction pipe, 11... Check valve, 12... Valve hole, 14... First flow path, 16...
...Second flow path, 20...Suction valve.

Claims (1)

[Scope of utility model registration request] The spraying section is provided with a cylinder member into which the piston is slidably fitted, and a holder member into which the cylinder member is loosely inserted, and a second flow path is provided in the length direction between these two members. The second flow passage is located on the rear end side of both members and communicates with the first flow passage constituted by the piston rod inserted into the cylinder member and the inner peripheral surface of the cylinder member. The divided cylinder space side is communicated with the liquid supply side through a communicating suction valve and suction pipe, and a check valve that is closed by the forward movement of the piston when retracting is provided in this piston portion, and this check valve A sprayer characterized in that a valve hole that communicates between the first flow passage and the cylinder space side is opened and closed, and the tip side of the second flow passage is communicated with a nozzle member.