JPH0523239Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a switching device for a spray nozzle for cleaning, pesticide spraying, etc.

[Conventional technology]

In spraying machines for cleaning liquids, agricultural chemicals, etc., a two-headed branch pipe is installed at the tip of the spray tube, with a long-distance nozzle for long-distance, narrow-angle spraying on one end, and a wide-angle nozzle for short-distance, wide-angle spraying on the other. something has been known for a long time.

The above two-headed branch pipe is composed of mutually parallel branch parts and a communication part that communicates these branch parts, and the tip of the spray pipe is connected to the center of the communication part. A switching valve is provided in the communication part, and by operating a switching shaft connected to this switching valve with an operation part at hand of the spray pipe, the switching valve is activated, and the fluid in the spray pipe is guided to one of the branch parts. This is what I did.

[The problem that the idea attempts to solve]

However, in a sprayer having a branch part with the above configuration, in the switching valve, the part from the spray pipe to the communication part, and the part from the communication part to the branch part,
Since each flow path bends at right angles, fluid pressure loss occurs at these portions. Such losses, especially when using long-distance nozzles,
This has the disadvantage that the spray pressure is reduced and the distance the spray reaches is shortened.

Therefore, an object of this invention is to provide a switching device for a spray nozzle that reduces pressure loss.

[Means to solve the problem]

In order to solve the above problems, this invention provides a branch pipe at the tip of the spray pipe, and connects the branch pipe to a long-distance branch, a wide-angle branch parallel to the long-distance branch, and a communication part that connects both branches. The above-mentioned long-distance branch is provided on the same axis as the spray pipe, and a long-distance valve device is provided inside the long-distance branch near the distal end side of the communication portion, and the valve stem of the valve device is provided. It is connected to the opening/closing operation part at the base end of the spray tube, and a wide-angle valve device is provided inside the wide-angle branch part closer to the tip side than the communication part, and a piston is slidably inserted to the rear end side of the communication part. The valve stem of the valve device is integrated with the piston, and an elastic force is applied to the piston in the direction of closing the valve hole.

[Effect]

When you operate the opening/closing operation part on the spray tube to open the long-distance valve device and open the main cock to supply pressurized water, the pressurized water in the spray tube is guided to the long-distance branch and produces a long-distance spray. will be carried out. At this time, the pressure within the distal branch decreases below a certain level, so the piston communicating therewith is maintained in the forward state by the elastic force applied thereto. Therefore, the wide-angle valve device is in a closed state.

Next, when the opening/closing operation section of the spray pipe is operated to open the distal valve device, the pressure within the distal branch increases. Therefore, the pressure within the wide-angle branch also increases, and when that pressure overcomes the elastic force applied to the piston, the piston retreats. This opens the wide-angle valve device and performs wide-angle spraying.

〔Example〕

An embodiment of this invention will be described based on the drawings.

As shown in FIGS. 1 and 2, a spray tube 3 is constituted by a double tube of an inner tube 1 and an outer tube 2, and a branch tube 5 is connected to the tip of the outer tube 2 via a joint 4. Also,
An opening/closing operation part 6 connected to the base end of the inner tube 1 is provided at the base end of the outer tube 2. The inner pipe 1 is connected to the above-mentioned joint 4.
The inside is penetrated in a watertight manner by a ring 7, and a valve body 8 is attached to the tip thereof. Also,
A hole 9 is provided at the tip of the inner tube 1.

The branch pipe 5 is composed of a long-distance branch 10, a wide-angle branch 11 parallel to the long-distance branch 10, and a communication part 12 connecting the centers of both the branches 10 and 11. The far branching section 10 is provided on the same axis as the spray pipe 3.

Inside the above-mentioned long-distance branching section 10, the communication section 1
A valve seat 13 is provided at a position closer to the tip than the valve seat 2, and a valve hole 14 is formed in the center of the valve seat 13. The inner tube 1 is inserted into the rear part of the distal branch 10, and the valve body 8 at the tip thereof is opposed to the valve hole 14. Further, the distal branch portion 10 and the inner tube 1 are communicated with each other through a hole 9 formed in the inner tube 1.

Inside the wide-angle branch section 11, the communication section 1
A valve seat 13 is provided at a position closer to the tip than the valve seat 2, and a valve hole 14 is formed in the center of the valve seat 13. Further, a piston 15 that slides inside the wide-angle branch portion 11 is provided on the rear end side of the communication portion 12 . A valve rod 16 is integrally formed at the front end of this piston 15, and a valve body 8 is attached to this valve rod 16. At the rear end of the piston 15, an adjustment spring 17 is pressed to adjust the piston 15.
An elastic force is applied to the valve hole 14 in the closing direction. Also,
A cap 18 is screwed to the rear end of the wide-angle branch 11, and an adjustment threaded rod 19 is inserted into the center of the cap 18. A pressure plate 20 is provided at the front end of the threaded rod 19, and the pressure plate 20 allows the adjustment spring 1 to be
7 to adjust the elastic force of the spring 17.

In addition, the above-mentioned long-range branching section 10 and wide-angle branching section 1
A joint pipe 21 is firmly fitted into each tip of the joint pipe 21, a connecting screw 22 is attached to this joint pipe 21, and a long-distance nozzle 23 is attached to each connecting screw 22.
and a wide-angle nozzle 24 are attached.

The spray nozzle switching device of the embodiment is constructed as described above, and its operation will be explained next.

Adjustment screw rod 19 provided in the wide-angle branch part 11 in advance
After adjusting the required elastic force to the piston 15, operate the opening/closing operation part 6 at the base end of the outer tube 2 to open the valve hole 14 of the long-distance valve device and open the main cock. , supplying pressure water. The pressurized water in the inner pipe 1 flows out from the hole 9 of the inner pipe 1 and is guided to the valve hole 14 of the long-distance valve device, where it is sprayed from a long-distance nozzle 23. At this time, the pressure within the distal branch 10 decreases below a certain level, so the piston 15 communicating therewith is maintained in the forward state by the elastic force of the adjustment spring 17 applied to the piston 15.

Next, when the opening/closing operation part 6 at the base end of the outer tube 2 is operated to close the valve hole 14 of the long-distance valve device, the pressure inside the long-distance branch 10 increases. For this reason, the communication portion 12
The pressure within the wide-angle branch 11 also increases, and when the pressure of the pressurized water overcomes the elastic force of the adjustment spring 17 applied to the piston 15, the piston 15 retreats.
As a result, the valve hole 14 of the wide-angle valve device is opened,
Wide-angle spraying is performed from the wide-angle nozzle 24.

[Effect of idea]

According to this invention, as described above, since the long-distance branch is configured on the same axis as the spray tube, the pressure loss of the fluid in the long-distance branch is reduced, which has the effect of increasing the distance that the long-distance spray reaches. There is.

Furthermore, since a switching valve in the communication section is not required, there is an effect that the branch pipe can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of the spray tube in the attached state of the embodiment, and FIG. 2 is a cross-sectional view of the embodiment. 3... Spray pipe, 5... Branch pipe, 6... Opening/closing operation part, 8... Valve body, 10... Distance branch part, 11...
Wide-angle branch part, 12...Communication part, 13...Valve seat, 1
4... Valve hole, 15... Piston, 16... Valve stem,
17...adjustment spring.

Claims (1)

[Scope of utility model registration request] A branch pipe is provided at the tip of the spray pipe, and the branch pipe is composed of a long-distance branch, a wide-angle branch parallel to the long-distance branch, and a communication part connecting both branches, and the above-mentioned long-distance branch is used for spraying. Provided on the same axis as the pipe, a long-distance valve device is provided inside the long-distance branch portion closer to the distal end side of the communication portion, and the valve stem of the valve device is connected to the opening/closing operation portion at the base end of the spray tube, A wide-angle valve device is provided inside the wide-angle branch portion closer to the tip side than the communication portion, and a piston is slidably inserted to the rear end side of the communication portion, and the valve stem of the wide-angle valve device is integrated with the piston. , a switching device for a spray nozzle in which an elastic force is applied to the piston in the direction of closing the valve hole.