JP2789372B2 - Check valve integrated nozzle - Google Patents

Description

The present invention relates to the field of nozzles used in high-pressure water jet cutters and the like.

[Related Art] In a conventional nozzle with a check valve, the check valve and the nozzle are separately formed, and the check valve and the nozzle constituting the nozzle are separated. Therefore, when attaching and using a nozzle at the forefront of a high-pressure water jet cutter or the like that is used as an auxiliary method when driving a temporary steel sheet pile, H-section steel, steel pipe sheet pile, etc. into hard ground, Soil (sand, silt, clay, etc.) flows backward, fills the empty space where the check valve and spring in the cylinder body are inserted, and once filled, the soil etc. In some cases, spontaneous discharge cannot be performed due to such factors, and the check valve does not operate. Therefore, when a pile of a predetermined length cannot be driven during driving, the pile being driven is pulled up, the nozzle is removed to remove the clogged soil, etc., the inside is cleaned, and then the mounting is started again and the driving is started again. Complicated work was done.

[Problem to be Solved by the Present Invention] In a conventional nozzle, a check valve inserted into a cylinder main body is assembled separately from the nozzle in its configuration.
Therefore, when placing various piles, soil (sand, silt, clay, etc.) enters the vacant space where the check valve and spring are inserted from the nozzle, and stops the operation of the spring and check valve. was there.

However, the nozzle of the present invention forms the check valve and the nozzle integrally, and injects high-pressure water or the like through a through-hole formed in the inner portion of the check valve body, such as a water jet, so that the cylinder body In the gap between the check valve and the check valve integrally formed with the nozzle, the intrusion of the soil described above is completely eliminated, and the functions of the inserted spring and the check valve are reduced. There is no such thing.

Means for Solving the Problems According to the present invention, a lower opening has a slightly different diameter than an upper opening, and has a through hole and a fitting insertion hole which communicate with each other. A cylindrical main body in which a female screw of a predetermined length is engraved inward from the opening of the insertion hole, and an injection hole that can be inserted into the insertion hole and that is formed from the rear end to the front end, and is slightly formed from the front end; A check valve for forming a through hole connected to the injection hole from a lower outer peripheral portion, forming a recess below the through hole, forming a step below the recess, and forming a recess below the step; A check body having a body and a push body having a through hole on the inner side and a carved flange at the lower part is separately provided, and a check valve body having an O-ring inserted into a recess in an insertion hole of the cylinder body. After inserting and further inserting a spring around the outer periphery of the check valve body, the push body is screwed to the cylinder body and assembled. Check valve integrated nozzle.

[Operation] The operation of the present invention will be described below.

When the nozzle of the present invention is screwed to the tip of a high-pressure water jet cutter or the like and high-pressure water or the like is jetted, the high-pressure water or the like presses the tip of the check valve body, and the valve body is slightly moved downward. Let go down. At the time of this descent, the contact state between the slope portion at the tip of the check valve body and the corner portion in the cylinder body is eliminated, and a high pressure water or the like is formed from the through hole formed in the check valve body into the injection hole as a gap. It circulates violently and is jetted.

On the other hand, a spring is interposed between the outer surface of the valve body and the insertion hole in the cylinder body, but the above-mentioned soil is prevented from entering by an O-ring inserted into the recess. Therefore, since there is no invasion of soil, the expansion and contraction function of the spring is extremely good.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cylinder main body which is a constituent member of the nozzle a, and has a diameter from the upper opening 2 to the lower opening 3. Are different from each other to form a communicating through hole 4 and a fitting insertion hole 5. A female screw 4a is formed in the through hole 4 from the upper opening 2 to the lower part. Then, a female screw 6 is engraved inside the fitting hole 5 from the lower opening 3 to the upper part.

Reference numeral 7 denotes a check valve having a shape that can be inserted into the insertion hole 5, and has the following configuration. That is, the injection hole 10 is formed from the rear end portion 8 to the front end portion 9. A through-hole 11 is formed slightly below the tip to connect to the injection hole 10 from the outer periphery. Usually, a plurality of through holes 11 are formed. And through hole 11
A concave portion 12 into which the O-ring 13 is inserted is formed in a lower portion, and a step portion 14 is formed below the concave portion 12. Further, a recess 15 into which the O-ring 13 is inserted is formed on the outer periphery slightly above the rear end 8. The tip 9 is formed to be slightly inclined so that the check valve 7 and the corner 4b below the through hole 4 are in contact with each other.

Reference numeral 16 denotes a push body having a function of preventing damage to the check valve body 7 and preventing intrusion of sand, silt or the like into the spring 20, and has the following configuration. A through hole 17 is formed on the inside, a flange 18 is formed on the lower part, and a cylinder body a is formed on the outer part.
The male screw 19 to be screwed with the female screw 6 is formed. The push body 16 is assembled so that the cylinder body a is located between the check body 7 and the check body 7. 20 is a spring.

In order to assemble the nozzle a composed of the above-described components, the leading end 9 of the check valve 7 in which the O-rings are inserted into the recesses 12 and 15 in the insertion holes 5 of the cylinder main body 1 is placed first. And insert it. Then, the spring 20 is inserted into the valve body 7. Thereafter, the male screw 19 and the female screw 6 of the push body 16 are screwed. As a result, the spring is placed on the upper end of the push body 16 on the side opposite to the flange 18, and the check valve body 7 is pushed up by the spring 20, and the inclined distal end 9 of the valve body 7 passes through the through hole. 4 is in contact with the corner 4b.

21 is a tip fitting to which the nozzle a of the present invention is connected, 22 is a high-pressure water pipe connected to the tip fitting 21, 23 is a connection pipe, 24 is a bend pipe, 25 is a high-pressure one-sided taper nipple, 26 and 27 are high-pressure hoses Reference numerals 28 denote holding bands for fixing the tip fitting 21 connected to the nozzle a to the side surface of the sheet pile 29. 30
Is a steel pipe pile, 31 is an H steel pile, and 32 is a high pressure water jet cutter.

[Effects] The present invention has the following effects.

The nozzle of the present invention has a check valve body in which an O-ring and a spring are fitted and inserted into a cylinder body having the above-described structure,
Since a push body is screwed into the lower opening of the cylinder body to support the spring, the soil (sand, silt, clay, etc.) flowing back from the injection hole that constitutes the check valve body enters the spring. There is an excellent advantage that there is no such thing as invasion to significantly reduce the spring function and stop the function of the check valve element.

[Brief description of the drawings]

1 is a longitudinal sectional view of a check valve integrated nozzle of the present invention, FIG. 2 is a partially cutaway longitudinal sectional view of a cylinder main body, FIG. 3 is a plan view of the cylinder main body, and FIG. 5, FIG. 5 is a plan view of the same, FIG. 6 is a longitudinal sectional view of the same push body, FIG. 7 is a plan view of the same, FIG. 8 is each member constituting a high-pressure jet cutter connecting the nozzles. 9 is a side view of the nozzle before assembling, FIG. 9 is a front view of the nozzle, showing the operating state of the nozzle, and FIGS.
FIG. 12 and FIG. 12 are cross-sectional views of the respective piles to which a jet cutter hose is attached, and FIG. 13 is a partially cutaway slope view of a high-pressure water jet cutter. a ... nozzle, 1 ... cylinder body, 2 ... upper opening, 3 ...
... lower opening, 4 ... through-hole, 4a ... female screw, 4b ... corner, 5 ... fitting insertion hole, 6 ... female screw, 7 ... check valve body, 8
... rear end, 9 ... front end, 10 ... injection hole, 11 ... through hole, 12 ... recess, 13 ... O-ring, 14 ... step, 15 ...
Recess, 16 push body, 17 through hole, 18 flange,
19 ... male screw, 20 ... spring, 21 ... tip fitting, 22
… Water conduit, 23… connection pipe, 24… bend pipe, 25… taper nipple, 26, 27… high pressure hose, 28… holding band, 29… sheet pile, 30… steel pipe pile, 31 ......
H steel pile, 32 High pressure water jet cutter.

Continuation of the front page (56) References JP-A-56-78651 (JP, A) JP-A-50-66816 (JP, A) Tokuyo Sho 62-501382 (JP, A) Real opening Sho-57-35858 (JP, A) , U) Fully open 57-140860 (JP, U) Fully open 61-856 (JP, U) Fully open 61-150064 (JP, U) Fully open 20-20950 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B05B 1/00-1/36 B26F 3/00

Claims (1)

(57) [Claims] A lower opening having a diameter slightly different from that of the upper opening and having a communicating through-hole and a fitting insertion hole, inwardly of the opening of the through-hole and inner of the opening of the fitting insertion hole; A cylindrical body in which a female screw of a predetermined length is engraved in the direction, and an injection hole which can be inserted into the fitting hole, is formed from a rear end portion to a front end portion, and the injection hole is formed from an outer peripheral portion slightly below the front end portion. A check valve body that forms a recess below the through hole, a step below the recess, a recess below the step, and a through hole inside. A push body for engraving a flange on the lower part is separately provided, and a check valve body having an O-ring inserted into a concave portion is inserted into a fitting hole of the cylinder body, and further a check valve body is provided. A check valve integrated nozzle, wherein a push body is screwed to a cylinder body after a spring is inserted into an outer peripheral portion of the nozzle and assembled.