JPH046845Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a telescopic sprayer for spraying agricultural chemicals, liquid fertilizers, and other chemical solutions, and is particularly suitable for spraying chemical solutions under high pressure. This relates to an expandable chemical liquid conduit.

Prior Art Conventionally, as this type of expandable chemical liquid conduit, two pipe bodies with different diameters are used, and a small diameter pipe is inserted into the large diameter pipe, as in the device described in Japanese Utility Model Publication No. 58-4597, for example. An O-ring is fitted to one end of the loosely inserted small-diameter pipe to slidably seal the large-diameter pipe and the small-diameter pipe,
It is known that one end of a large diameter tube is connected to the chemical liquid pressure feeding side and the other end of a small diameter tube is connected to the spray nozzle side. However, with this type of product, the O-ring mounting part is thick, so the area that receives pressure in the axial direction from the pressurized chemical solution is large, and therefore it is difficult to fix the telescopic tube at an arbitrary position. , it has the disadvantage that it can only be used in a long extended state.

Purpose of the invention The present invention was developed in response to these circumstances, and even in cases where chemical solutions are sprayed under high pressure, such as in the case of power sprayers, it is possible to use a spray nozzle attached to the spray nozzle. It is an object of the present invention to provide a chemical liquid conduit for a sprayer that can be used by adjusting the length of the chemical liquid conduit to an arbitrary length.

Structure of the invention The gist of the invention is to include an inner tube having a connection part with a spray nozzle side or chemical liquid pressure-feeding side member at one end, and an inner tube that is fitted externally to the inner tube and near the connecting member of the inner tube. A quadruple tube section is constructed by using two double tubes of different diameters, each consisting of an outer tube that is fixed and closed, and loosely fitting them in an alternating state. In this step, the gaps between the adjacent tube bodies are slidably sealed with a sealing member, and a threaded portion provided at the open end of the outermost tube of the quadruple tube section and the outermost tube are connected to each other. The length of the quadruple pipe section can be fixed at any desired length by screwing together the brake ring loosely fitted into the adjacent pipe body and the tightening ring fitted externally, and pressing the brake ring against the pipe body. There is a telescopic chemical liquid conduit for the nebulizer configured so that it can be used. A detailed description will be given below based on the drawings.

In the present invention, in FIG.
an inner tube 2a having an inner tube 2a, and an outer tube provided coaxially with the inner tube 2a and having one end closed by being fixed and integrated with the inner tube 2a near the connection portion 1a of the inner tube 2a with the spray nozzle side. Double pipe 1 consisting of pipe 3a
0, an inner pipe 2b having at one end a connecting part 1b connected to a liquid feeding hose etc. connected to a chemical liquid pressure feeding part (not shown) via an opening/closing hook (not shown), and an inner pipe 2b provided coaxially with the inner pipe 2b. and an outer tube 3b which is integrated with the inner tube and is closed near the connection part 1b of the inner tube 2b with the chemical liquid pumping side,
The outer tube 3 is placed in the outer tube 1b having a slightly larger diameter than the outer tube 3a, with the opening sides of the outer tubes 3a and 3b facing each other.
By loosely inserting the inner tube 2a into the inner tube 2a having a slightly larger diameter than the inner tube 2a, each tube body 3a, 3b,
2a and 2b form a quadruple tube section 30 in which the tubes 2a and 2b are alternately overlapped.

The end portion 4 of the inner tube 2b, which is a tube fitting adjacent to the innermost tube 2a forming the quadruple tube section 30, is bent and bulged outward and contacts the inner side of the outer tube 3a with some play. A seal member retaining ring 6 having O-rings 5a and 5b on the outer peripheral surface is screwed into this bulging end 4, and an end edge 6 of the retaining ring 6
The gap between the innermost tube 2a and the adjacent outer tube body 2b is inserted into the groove formed by the inner tube 2b and the bent bulge 4a of the inner tube 2b. A U-packet 7 is housed as a sealing member for movably sealing. Also, the end 8 of the outer tube 3a that is loosely fitted into the outermost tube 3b is similarly formed thick and bulges outward, and the outermost tube 3b and the adjacent tube are attached to the bulged end 8. An O-ring 9 is provided as a sealing member that slidably seals the gap between the pipe body 3a and the pipe body 3a. On the other hand, the outer circumference of the open end of the outermost tube 3b is provided with a male thread as a threaded portion 11, and the outer tube 3a adjacent to the outermost tube 3b has an outer tube 3a as shown in FIG. Brake ring 1 having a notch 16 provided along the axial direction of 3a
5, and a tightening cap 12 is loosely fitted between the threaded portion 11 and the brake ring. The brake ring 15 has a bulging part 17 whose wall thickness increases in the direction of the threaded part 11. On the other hand, the inner surface of the tightening cap that can be externally fitted onto the brake ring 15 has a bulge part 17 that increases in thickness toward the threaded part 11. Tapered surface 13 that increases as the direction increases
A female thread is formed to engage with the threaded portion 11.

Function The above-mentioned expandable chemical liquid conduit connects a spray nozzle pipe, a hose with an opening/closing knob, etc. to the connection parts 1a and 1b, respectively, and
The length of the quadruple pipe part 30 is determined according to the height of the tree to be sprayed, and when the tightening cap 12 is screwed onto the threaded part 11 and tightened, the tapered surface 13 on the inner surface of the cap matches the diameter of the brake ring. is reduced and strongly pressed against the tube body 3a, and the relative positions of the double tubes 10 and 20 are fixed. By adjusting and fixing the length of the quadruple tube section in this way, the length of the drug solution conduit can be changed as desired.

Effects In the chemical liquid conduit of the present application, since the sliding contact portion of the pipe body is triple-sealed, the air sealed by the sealing material acts as a brake on the mutual movement of the double pipes, and furthermore, the above-mentioned If the innermost pipe and its adjacent pipe are sealed with a U-packet as in the example, the pressure receiving surface for the pressure exerted by the high-pressure chemical liquid is small, and the U-packet has a tightening effect on the innermost pipe, so that tightening is prevented. By simply lightly tightening the attached cap, it has an excellent effect in that even when spraying high-pressure chemical solutions of 20 to 30 kg/cm ² , there is no expansion due to pressure unlike in the past.

[Brief explanation of drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of the present invention, and FIG. 2 is a perspective view of a brake ring, which is a component of the present invention.

Claims (1)

[Claims for Utility Model Registration] (1) An inner tube having a connection part with a spray nozzle side or chemical liquid pumping side member at one end, and coaxial with the inner tube and fixed to the inner tube near the connection part. A pair of double tubes consisting of an outer tube with one end closed is in a state where the inner tube or outer tube of one double tube is interposed between the inner tube and the outer tube of the other double tube. The inner tube and the outer tube that are adjacent to each other in the quadruple tube section are fitted together to form a quadruple tube section, and the inner tube and outer tube that are adjacent to each other are slidably in contact with each other via a sealing member. The open end of the outer tube is provided with a threaded portion, and the tube body fitted into and adjacent to the outermost tube includes:
A brake ring and a tightening cap that can be externally fitted onto the brake ring are loosely fitted, and by screwing the tightening cap and the threaded portion together,
A telescopic chemical liquid conduit for a sprayer, characterized in that the brake ring is pressed into contact with the pipe body, so that the length of the quadruple pipe part can be arbitrarily fixed. (2) The extensible chemical liquid conduit according to claim 1, wherein the sealing member between the innermost tube of the quadruple tube portion and the tube body adjacent thereto is constituted by a U-packet.