JPS63111954A - Spray nozzle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention generally relates to a spray nozzle;
More specifically, the present invention relates to a spray nozzle that has a spiral wing section and sprays a cone-shaped mist created by the wing section.

(Prior Art) The above-mentioned types are used in various fields requiring spraying of finely separated liquids, such as fire extinguishing operations, scrubbing of harmful substances from chimney exhaust gases, and humidification operations. A spray nozzle is used.This spiral wing has a tapered and gradually narrowing ``■-shaped'' shaft hole, from which droplets are ejected. The individual turns of the section scrape a thin film of liquid from the main stream of liquid in the axial bore, so that the liquid is ejected as a helically shaped film. If the pressure of the fluid supplied to the atomizing nozzle is the same, the spray nozzle will have a helical wing. The individual droplets of mist created by a spray nozzle with a spiral shape are much finer than the individual droplets of mist created by a conventional spray nozzle without helical wings, i.e. If you try to create a fine mist of individual droplets using a regular spray nozzle that does not have spiral-shaped wings, you can do the same using a spray nozzle that has spiral-shaped wings. Compared to creating a fine mist with droplets of moderate size, the pressure of the liquid supplied to the spray nozzle must be increased.

U.S. Patent No. 1.549.537, No. 2.518.
No. 116, No. 2,612.407, and No. 3
．． Conventional helical spray nozzles, such as those shown in Publication No. 301.485, have distinct drawbacks. When slurry is ejected from a helical atomizing nozzle, nozzle clogging is a regular problem due to the relatively small gaps between adjacent individual turns in the helical wing. It is. Relatively large solid particles entering the helical spray nozzle are unable to pass through the gaps between adjacent individual turns in the helical vane, eventually clogging the nozzle. bring about For example, in sulfur dioxide scrubbers in coal-fired plants, limestone slurry or magnesium slurry is sprayed through a spray nozzle to act as a chimney scrubber, but rather than solid particles of normal size. Large solid particles often clog the nozzle, so that spraying of the slurry from the nozzle is often stopped in order to clear the nozzle blockage.

In fact, existing helical spray nozzles with 1/2 inch diameter inlet orifices cannot pass a 1/4 inch diameter sphere.

Furthermore, the overall shape of the mist mass created by existing helical atomizing nozzles having a generally tapered axial bore is far from perfect due to inadequate flow of fluid at the outer end of the helical wing. It will not be a perfect cone shape. When the end of a helical atomizing nozzle is improperly shaped, the overall shape of the mist mass created by the helical atomizing nozzle will be
It does not become a perfect cone that opens to the desired 360 degrees on a plane, but becomes an incomplete cone that opens only about 320 degrees.

This 40 degree space on the plane that is not covered by the fog mass created by the helical spray nozzle allows the passage of smoke that is not processed by the fog, thus increasing the removal efficiency of solid particles from the smoke. Significantly lower.

(Problems to be solved by the invention) This invention was made under the above circumstances, and the purpose of the invention is to:
It is an object of the present invention to provide a spray nozzle having a clogging-free helical wing part that can allow any solid particles flowing into the shaft hole of the spray nozzle to pass through.

Another object of the present invention is to provide a spray nozzle having a helical wing section that can make the overall shape of the sprayed mist mass into a perfect cone that opens at 360 degrees in a plane. be.

Still another object of the present invention is to provide a spray nozzle having a spiral blade portion that is simple in structure, inexpensive to manufacture, durable, and highly efficient.

(Means for Solving the Problems) The various objects of the present invention described above are as follows: A tube-shaped inlet end having an inlet orifice; and a helical wing portion spaced apart from each other in the longitudinal direction, and the pitch of the plurality of one-turn portions of the helical wing portion is such that the pitch of two adjacent one-turn portions is two opposite to each other and spaced apart from each other in the longitudinal direction. The distance between the surfaces is set to be greater than the diameter of the inlet orifice, such that the helical wing region of the shaft hole extending from the inlet end through the inlet orifice into the helical wing extends from the inlet orifice. The spiral wing has a tapered shape that gradually decreases in diameter toward the outer end, and the outer end of the spiral wing region of the shaft hole has a parabolic shape with a vertical cross section defined by a parabola. This can be achieved by a spray nozzle characterized by the following.

(Operations and Effects of the Invention) In the spray nozzle configured as described above, the pitch of the plurality of one-turn portions of the helical blade portion is such that the pitch between the two opposed surfaces of two adjacent one-turn portions is spaced apart in the longitudinal direction. Since the distance is set to be larger than the diameter of the inlet orifice, all of the solid particles that have flowed into the helical wing region of the shaft hole through the inlet orifice at the inlet end are transferred to the helical wing. It is discharged to the outside through the gaps between the plurality of one-turn parts of the part. Therefore, no clogging occurs due to any solid particles flowing into the shaft hole of the spray nozzle.

In the spray nozzle configured as described above, the tapered portion of the helical wing region of the shaft hole increases the velocity of the liquid flowing into the shaft hole, thereby increasing the number of droplets sprayed from the spray nozzle. gives these numerous droplets enough energy to be able to create a suitable spray area. In addition, the parabolic shaped portion of the spiral wing region of the shaft hole in the spray nozzle constructed as described above sufficiently ensures that the liquid impinges on the one-turn portion located at the outer end of the spiral wing.

The helical wing area of the axial bore, which is constituted by a combination of tapered and parabolic shaped sections, ensures that a relatively complete mist dispersion occurs over the entire length of the helical wing, so that no mist is removed from the spray nozzle. The overall shape of the ejected mass of mist is a perfect cone with no defects in the plane.

In order to provide the spray nozzle with sufficient strength and to reduce the manufacturing cost as much as possible in the spray nozzle of the present invention configured as described above in order to achieve the above-mentioned object of the present invention, it is necessary to The pitch of the plurality of single turns of the plurality of turns is approximately 2 times to approximately 4 times the diameter of the inlet orifice.
It is preferred that the outer diameter of the spray nozzle is approximately 2.5 times to approximately 3 times the diameter of the inlet orifice.

This invention will be explained in detail below.

(Example) In the figure, the spray nozzle for spraying so that the overall shape of the fine mist is a flat and perfect cone is indicated by reference numeral 1.
It is indicated by 0. The spray nozzle 10 has a tube-shaped inlet end 12 with a threaded groove 13 formed on its outer circumferential surface, and a helical wing part 14 extending spirally from the inlet end 12 in the longitudinal direction. . Spray nozzle 10 has an axial bore 16 extending along a longitudinal centerline for passing fluid from inlet end 12 toward a turn 26 located at the outer end of spiral wing 14. . Thread groove 1 in tube-shaped inlet end 12
3 is connected to a liquid supply conduit (not shown). The shaft hole 16 has a tapered shape whose diameter gradually decreases from the inlet end 12 toward the one-turn portion 26 located at the outer end of the spiral wing portion 14 . A helically shaped elongated groove 20 is defined by the individual turns 22, 24, 26 of the helical wing 14 spaced M apart from each other. The individual turns 22, 24, 26 extend from the inlet end 12 to the axial bore 16.
scraping a thin film of liquid from the main stream of liquid entering the helical wing region of the blade. As a result, by the time the main flow of the liquid reaches the outer end of the helical wing region of the shaft hole 16, the overall shape of the mass of mist ejected from the shaft hole 16 is 36 mm in plane.
It becomes a perfect cone that opens at 0 degrees.

A cylindrical portion 15 is provided between the inlet end portion 12 and the spiral wing portion 14.
exists. The upstream surface 28 of the helical wing portion 14 extends radially outwardly from the shaft bore 16 and is flared so that the spray is directed outwardly and slightly forwardly by the upstream surface 28. The downstream surface 36 of the helical wing section 14 is generally parallel to the upstream surface 28. The pitch of the turns 22, 24, 26 of the helical wing 14 is such that the downstream surface 36 of one turn and the upstream surface 28 of another turn adjacent to said turn The gap a between the mutually opposed upstream and downstream surfaces 28 and 36 of the plurality of turns 22° 24. The diameter is set to be larger than the diameter of the A plurality of one-turn portions of the helical wing portion 14 2. 'z, 2
If the pitch of 4°26 (that is, the gap a) is set as described above, the shaft hole 16 will pass through the inlet orifice 40.
Any solid particles that have entered the area of the helical wing can be discharged to the outside of the spray nozzle 10 via the gap a. Note that the diameter determines the flow rate of the spray nozzle 10. With the configuration described above, the external connection region of the shaft hole 16 is affected by a mass of very large solid particles flowing from the slurry supply conduit through the inlet orifice 40 into the helical wing region of the shaft hole 16. It is possible to prevent clogging from occurring.

FIG. 2 shows that the helical wing region of the shaft bore 16 gradually decreases in diameter as it progresses from the inlet end 12 toward the outermost turn portion 26 of the helical wing 14. It clearly shows the situation. The helical wing region of the shaft bore 16 gradually decreases in diameter with a taper angle within a range of about 5 degrees to about 10 degrees from the point of maximum diameter. The taper angle is preferably approximately 6 degrees. The mid-tapered portion of the shaft hole 16 in the helical wing section continues from the inlet orifice 40 to a point approximately half the length of the helical wing section 14 .

The helical wing region of the shaft hole 16 outward from the above-mentioned point has a roughly parabolic shape, and the parabola constituting this parabolic portion 42 is defined by Y-positive, where 2Y is It is the cross-sectional dimension (namely, diameter) of the parabolic-shaped portion 42, and X is the length from the vertex of the parabolic-shaped portion 42 to the position where the cross-sectional dimension 2Y is measured.

It has been found that the helical wing region of the axial bore 16 is characterized by a tapered portion and a parabolic portion 42, thereby producing a more uniform spray over the entire length of the spray nozzle 10. . The tapered portion of the helical wing region of the shaft hole 16 increases the flow velocity of the liquid, thereby increasing the flow rate of the spray nozzle 1.
The parabolic shaped portion 42 of the helical wing region of the shaft hole 16 provides sufficient energy to the countless droplets sprayed from zero to enable these countless droplets to create an appropriate spray area. The impingement of the liquid against the one-turn section 26 located at the outer end of the section 14 is sufficiently ensured. These results in a relatively complete mist dispersion over the length of the helical wing 14, such that the overall shape of the mist mass ejected from the spray nozzle 10 is a perfect cone with no defects in the plane. Become.

If the helical wing region of the shaft hole 16 does not have a parabolic shaped portion 42 and the tapered portion extends to the outer end of the helical wing portion 14, the mist mass ejected from the spray nozzle 10 The overall shape is not a perfect cone without defects in the plane.

The spray nozzle 10 according to an embodiment of the invention is of unitary construction and is made of a suitable material that does not deteriorate in harsh environments, such as cobalt or boron alloys, or silicon carbide or silicon nitride ceramics. It is preferably formed by.

In order to provide a spray nozzle that has sufficient strength and does not cause clogging, it is preferable that the outer diameter of the spray nozzle 10 is approximately 2.5 times to approximately 3 times the diameter of the inlet orifice 40. . Still further, the pitch of the plurality of turns 22, 24, 26 of the helical wing 14 is such that the pitch of the plurality of turns 22, 24, 26 of the helical wing 14 is such that it creates a desired liquid flow in the liquid supply conduit that does not exceed a rate of 6-8 minutes/second. In order to be able to do so, it must be approximately twice to approximately four times the diameter of the inlet orifice 4.0.

[Brief explanation of the drawing]

1 is a front view of a spray nozzle according to an embodiment of the invention; FIG. 2 is a partially sectional side view with a part of the section taken along line II-II in FIG. 1; 10... Spray nozzle, 12... Inlet end, 13...
・Thread groove, 14... Helical blade part, 15... Cylindrical part, 16... Shaft hole, 20... Long groove, 22.24°2
6...-lip portion, 28... upstream surface, 36...
Downstream surface, 40... Inlet orifice, 42... Parabolic shaped portion. Applicant's agent Patent attorney Takehikoshi Suzue■ Figure 1 Figure 2

Claims (1)

[Claims] 1. A tube-shaped inlet end having an inlet orifice, and a spiral extending spirally in the longitudinal direction of the inlet end and having a plurality of single turns spaced apart from each other in the longitudinal direction. a wing section, the pitch of the plurality of turns of the spiral wing section is such that the distance between the two opposing surfaces separated in the longitudinal direction of the two adjacent turns is larger than the diameter of the inlet orifice. The helical wing region of the axial hole extending from the inlet end through the inlet orifice into the helical wing gradually decreases in diameter as it goes from the inlet orifice to the outer end of the helical wing. The outer end of the helical wing region of the shaft hole has a parabolic shape with a longitudinal section defined by a parabola, and the helical wing region of the shaft hole has a shape as described above. Because of the shape, all of the solid particles flowing into the helical wing region of the shaft hole through the inlet orifice at the inlet end fill the gaps between the multiple turns of the helical wing. A spray nozzle characterized in that the spray nozzle is discharged to the outside through the spray nozzle. 2. The pitch of the plurality of turns of the spiral wing portion is approximately twice to approximately four times the diameter of the inlet orifice, and the outer diameter of the spray nozzle is approximately 2.5 times the diameter of the inlet orifice.
The spray nozzle according to claim 1, characterized in that the spray nozzle is twice to approximately three times as large.