JPS625250Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure load release valve for a power sprayer used for crop control, water pumping, etc.

In conventional power sprayers, the pressurized water after closing the on-off valve at the discharge port is released through a relief valve. However, in the case of a relief valve, the ball valve pressed by a spring is pushed up by pressure water against the spring and escapes to the spillway, so there is always a loss of power required to push up the spring. However, there was a problem in that power was wasted even when no water was being conveyed.

In addition, in this state, the ball valve was constantly being pushed up by pressure water, and when water leaked, the ball valve was chattering, producing a beeping and high-frequency noise. In order to eliminate these problems, a spring release device for the relief valve is installed in the relief valve device, and when water is not being supplied, the spring can be released and the water can escape to the spillway without any load. However, it was not used much because it was cumbersome to operate.

The present invention is configured so that the valve of this spill port can be opened automatically.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

Figure 1 is a front view of a conventional power sprayer with a water intake port at the tip of a piston, Figure 2 is a side sectional view, and Figure 3 is a side sectional view.
The figure is a side view of a conventional power sprayer with an in-piston water inlet type.

Referring to FIGS. 1 and 2, the conventional technology is explained. An input pulley 3 is rotated by a motor or an engine, and a crankshaft 9 is rotated. The crankshaft 9 gives a forward and backward motion to a conrod 12 within a crankcase 11, and the conrod 12 drives a piston 16 which moves back and forth within a cylinder 13.

In the conventional embodiment shown in FIGS. 1 and 2, the piston 1
The inside of the piston 6 is solid, and a water intake port 10 for sucking water from the tank is provided at the tip of the piston 16. A suction valve 14 is located between the water intake port 10 and the piston 16.
is provided. Since the suction valve 14 is closed, the pressure water applied by the piston 16 pushes open the discharge valve 15 and flows into the accumulator 1.
Enter the water storage chamber 25. Opening/closing valve 4a of discharge port 4
When the outlet 4 is opened, the pressurized water comes out from the outlet 4.

When the on-off valve 4a is closed, the pressure increases and the ball valve is pushed up against the spring from inside the relief valve device 8 shown in FIG. 5 is a handle for adjusting the relief pressure, and 6 is a release handle for releasing the spring.

Conventionally, the release handle 6 was used to release the spring and fully open the relief valve to allow water to leak without any load.

The present invention is configured to automatically open this relief valve. 2 is a pressure gauge.

FIG. 3 shows a conventional power sprayer of the piston water absorption type. This conventional device has been improved as shown in FIGS. 4 and 5.

Figure 4 shows an example of the water intake port type at the tip of the piston.
The figure is a drawing showing an embodiment of the piston water intake port type.

In FIG. 4, a check valve 22 between the suction valve 14 and the discharge valve 15 is pushed outward by a spring 21. Check valve 2 in the direction that the pressure water from inside cannot escape as it is.
2 is provided. An operating rod 23 is provided so that the check valve 22 can be opened by pushing it from the outside with an operating rod 23, and the operating rod 23 is pushed by the diaphragm 20.

A spring 28 is also interposed in the operating rod 23 to always bias the check valve 22 in a direction that does not push it. On the other hand, the pressure water
, and then push the operating rod 23 further to push the check valve 23 open. The pressure water in the water storage chamber 25 reaches the back surface of the diaphragm 20, and the diaphragm is configured to be pushed by an increase in the pressure in the water storage chamber 25. When the on-off valve 4a of the discharge port 4 closes, pressure water fills the water storage chamber 25,
The pressure behind the diaphragm 20 also becomes high, and the diaphragm 20 pushes the operating rod 23 to open the check valve 22, allowing the pressure water to escape from the surplus water pipe 17 to the tank, releasing the load. 18 is a tank, and 19 is a water suction pipe.

The same applies to the piston water absorption type power sprayer shown in FIG.
5 are connected by a pipe 24 so that the pressure of the water storage chamber 25 is applied to the back surface of the diaphragm 20. In the case of FIG. 5, the water sucked from the water intake port 10 passes through the inside of the piston 16 and is discharged from the suction valve 14 into the cylinder 13, and the suction valve 14 is integrated with the piston 16. There is. Since the check valve 22 can be provided on the wall opposite the piston 16, the structure can be made compact.

As described above, the present invention is based on the suction valve 14 of a power sprayer.
A check valve 22 is provided between the discharge valve 15 and the discharge valve 15, and the check valve 22 is pushed open with the operating rod 23 by the water pressure between the discharge valve 15 and the discharge port 4 to release the pressure. The problem of chattering and constantly draining excess water against the spring, which is the case with relief valves, is eliminated, and the load is completely released, eliminating unnecessary loss of power, and eliminating the need for conventional manual release devices. Unlike this, the release operation can be performed automatically.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional power sprayer with a water intake port at the tip of a piston, Figure 2 is a side sectional view, and Figure 3 is a side sectional view.
The figure is a side view of a conventional power sprayer with an in-piston water inlet, Figure 4 is a drawing showing an embodiment of the present invention of a power atomizer with a piston tip water inlet, and Figure 5 is an example of an in-piston water inlet type. FIG. 4...Discharge port, 10...Water intake port, 13...Cylinder, 14...Suction valve, 15...Discharge valve, 22
...Check valve, 23...Operation rod.

Claims (1)

[Scope of utility model registration request] A check valve is provided between the suction valve and the discharge valve of the power sprayer, and the check valve is pushed open with an operating rod 23 by water pressure between the discharge valve and the discharge port to release the pressure. A power sprayer featuring: