US3085754A - Half-circle sprinkler head - Google Patents

Half-circle sprinkler head Download PDF

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Publication number
US3085754A
US3085754A US6044160A US3085754A US 3085754 A US3085754 A US 3085754A US 6044160 A US6044160 A US 6044160A US 3085754 A US3085754 A US 3085754A
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Prior art keywords
wall
flow
inlet passage
head
inlet
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Walter Van E Thompson
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Walter Van E Thompson
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/046Outlets formed, e.g. cut, in the circumference of tubular or spherical elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/267Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being deflected in determined directions
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00Fluid sprinkling, spraying, and diffusing
    • Y10S239/01Pattern sprinkler

Description

April 16, 1963 w. VAN E. THOMPSON 3,085,754

HALF-CIRCLE SPRINKLER HEAD' Filed Oct. 4, 1960 24 Wu 75R V4/v E THouPso/v, 25 x INVENTOR.

7 WHA/VN & McMA/V/GAL Af/omeys fin Anal/ken) United States Patent 3,085,754 HALF-CIRCLE SPRHNKLER HEAD Walter Van E. Thompson, San Marino, Calif. (2251 E. 7th St., Los Angeles 23, Calif.) Filed Oct. 4, 1960, Ser. No. 60,441 3 Claims. (Cl. 239-523) The present invention relates generally to lawn sprinklers, and is more particularly concerned with half-circle sprinkler heads such as may be employed along the edges of lawns.

The present invention constitutes an improvement in sprinkler heads of the type disclosed in my United States Letters Patent No. 2,785,005, issued March 12, 1957.

In the above patent, I disclosed a half-circle sprinkler head wherein the spray issued from a diagonally directed spray outlet orifice in the form of a modified half-circle, the spray orifice extending upwardly andoutwardly from a vertical inlet passage, and being defined by a spheroidal upper wall and a lower cylindrical wall. In the sprinkler head of the patent, it was contemplated that the distribution areas of the sprays would be arranged in overlapping relation.

The present invention in its broad concept seeks to obtain improved and better distribution of the sprayed water, particularly close in and under the sprinkler, and which is arranged to be mounted on a riser or supply pipe about six to eight inches above the ground.

Briefly, the sprinkler head, as more specifically described subsequently herein, difiers primarily from the above patented structure in that the axis of the cylindrical Wall extends horizontally or at right angles to the inlet passage axis.

A further object of the invention is to provide improved means for controlling flow of water through the nozzle openings.

Still another object is to provide a unique combination of support and head mounting of simple construction, wherein the head and support interconnected for axial relative movement which results in regulation of the flow and control of the spray,

Further objects of the invention will be brought out in the following part of the specification, wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.

Referring to the accompanying drawings, which are for illustrative purposes only:

FIG. 1 is an elevational view of a sprinkler head embodying the features of the present invention;

FIG. 2 is a plan view of the same;

FIG. 3 is a sectional view, taken substantially on line 3-3 of FIG. 2, the head being shown as combined with a support;

FIG. 4 is a vertical section showing a modified arrangement;

FIG. 5 is a detailed view of a difiuser disc as utilized in the device of FIG. 4; and

FIG. 6 is a vertical section showing another modified form of the invention.

Referring now generally to the drawings, for illustrative purposes, the sprinkler head of the present invention, as generally indicated at 10, comprises a body 11 which is constructed with an externally threaded lower end portion 12 and an upper end head portion 13 of truncated conical configuration and associated at its base with a polygonal portion 14. The polygonal portion 14 is adapted to have a wrench or other tool applied thereto, and by means of which the sprinkler head may have its lower end portion 12 threadedly attached to the uppermost end of a coupling 15 which is provided with an annular end groove 16 for the admittance of the polygonal portion 14 therein. The opposite end of the coupling is internally threaded 3,085,754 Patented Apr. 16, 1963 to receive a threaded end of a riser pipe 17 which serves to support the coupled spray head above the ground surface and supply water thereto.

As shown in FIG. 3, the body 11 is provided on a central axis x--x with a spray inlet passage 18, the lowermost end of this passage communicating with an inlet opening 19 and the uppermost end of the passage communicating with a spray orifice 20 opening into the conical face of the head portion 13.

The spray orifice 20 is machined or otherwise fabricated to provide an upper spheroidal wall 21 and a lower cylindrical wall 22 which are generated around an axis y-y having right angle relation with respect to the axis x--x. The active surface of the spheroidal wall 21 constitutes a portion of a sphere generated with respect to a point p by a radius r of approximately 1.125". The cylindrical surface of the wall 22 is a portion of a cylinder generated by a radius R so that the center line of the cylindrical wall 22 will extend horizontally. The point p is displaced from the axis xx by a distance d which may be determined as follows:

An angle of 33 is drawn from the intersection point of the center line of the surface of wall 22 with the vertical axis x-x, as indicated at a. From point b, where the 33 line 23 intersects the conical surface of the head portion, a radius r is used to scribe an arc intersecting the axis y-y. This locates the point p and determines the distance d. Using the point p, and radius r, the surface of wall 21 may then be generated. The surface of wall 21 and the surface of wall 22 are carried rearwardly past the inlet passage 18. This arrangement of cooperating walls 21 and 22 in the discharge orifice 20 results in the breaking up of the stream of water received through the inletpassage 18 in such a manner that the distribution will be more effective, particularly close under the sprinkler.

In order to control the discharge from the sprinkler, the coupling 15 is provided intermediate its ends with a transversely extending bafiie wall 24 which is interposed in the path of flow of water from the riser pipe to the inlet opening 19, a plurality of circumferentially spaced openings 25 being arranged in the baflle =wall. These openings are shown as being outwardly spaced with reference to the spray inlet passage. Direct flow from the openings 25 to the inlet opening 19 is broken up and eddy currents avoided by providing an annular projecting flange 26 at the inlet opening 19. The body 11 and coupling '15 being threadedly interconnected, the flange 26 and baflle wall may be adjusted towards and away from each other, thus serving as valving members to control the flow.

A modified structure is shown in FIG. 4, wherein the body 11 on its lower end portion is provided with a peripheral skirt 27 which serves as a support for a diffuser disc 28 having spaced relation to the inlet opening 19. This diifuser disc, as shown in FIG. 5, is provided with a plurality of spaced peripheral notches 29 for flow of water in its passage from an axial opening 30 in the bafiie wall 24 enroute to the inlet opening 19. The diffuser disc in this case acts to smooth out the flow and eliminate eddy currents in this form of the invention. Control of flow is accomplished in this case by axial adjustment of the body 11 to position the diffuser disc towards and away from the opening 30 in the bafiie wall.

Another modified structure is shown in FIG. 6, which differs from the previously described structures of FIGS. 3 and 4 by having an inlet passage 18 in which there is a section 31 that is tapered in the direction of fiow therethrough. In this modification, it will be observed that the section 31 at its smaller uppermost end communicates with the spray orifice 20 through a cylindrical end section 32, while at its larger lowermost end the section 31 is in communication with an outwardly flared end section 33.

The battle plate 24 is in this case formed as a separate piece and provided with a valve member in the form of an upstanding central projection 34 having a taper corresponding to that of the section 31 so as to permit a flow regulatory telescopic adjustment between the projection 34 and the section 31.

Relative adjusting movements are accomplished by screwing the body 11 inwardly or outwardly of the associated coupling 15. This arrangement enables a finer and closer adjustment to be obtained. For example, the arrangement may be readily designed so that three and one-half turns of the body 11 will be required in going from fully closed to fully opened positions. This modification also has the further advantage of providing a more direct flow with less turbulence.

A perforated cupped difluser disc 28' is in this form of the invention positioned below the baflie plate, the

disc being secured at its periphery to the Wall of the coupling 15.

Various modifications may suggest themselves to those skilled in the art without departing from the spirit of my invention, and, hence, I do not Wish to be restricted to the specific form shown or uses mentioned, except to the extent indicated in the appended claims.

I claim:

1. In a part-circle sprinkler: a head member comprising a body having an inlet passage leading upwardly therein and communicating with a spray nozzle; a tubular support for said head adapted for connection to a fluid supply; annular projecting means on said head member surrounding the inlet end of said inlet passage for defiectingly diffusing the fluid at said inlet end; and a baflle wall in said support in the fluid flow path to said inlet passage ahead of said means, said wall having a plurality of circumferentially spaced flow openings therein outwardly spaced from said annular projecting means, whereby flow from said flow openings to said inlet end will be substantially radially inwardly, said wall being relatively movable towards and away from said inlet passage to control the fluid flow thereto.

2. In a part-circle sprinkler: a head member comprising a body having an inlet passage leading upwardly therein and communicating with a spray nozzle; a tubular support for said head adapted for connection to a fluid supply; a batfle wall positioned adjacent the inflow end of said inlet passage, said wall having a flow opening therein positioned radially outwardly of said inflow end so that the flow will be generally radially inwardly from said flow opening to the inflow end of said inlet passage; means supporting said body and said bafile for relative axial movements to adjustably vary the proximity of said inflow end to said baflie wall for controlling the fluid flow to said passage; and an annular projecting flange positioned around said inflow end on said body for diverting the fluid from a direct entering flow path to said passage.

3. In a part-circle sprinkler: a head member comprising a body having an inlet passage leading upwardly therein and communicating with a spray nozzle, said passage at its inflow end being of enlarged diameter; a tubular support for said head adapted for connection to a fluid supply; a baffle wall positioned adjacent the inflow end of said inlet passage, said Wall having a central flow opening therein; a difluser disc carried by said body spanning said enlarged passage end, said disc having a solidcentral area surrounded by a plurality of peripheral openings outwardly spaced with respect to said central flow opening; and means supporting said body and said bafile for relative axial movements to adjustably vary the proximity of said disc central area to said baflle wall central flow opening for controlling the fluid flow to said passage.

References Cited in the file of this patent UNITED STATES PATENTS 264,317 McTighe et al. -2 Sept. 12, 1882 1,507,350 Franzen Sept. 2, 1924 1,559,655 Thompson Nov. 3, 1925 1,625,042 McArdle Apr. 19, 1927 1,837,575 Munz Dec. 22, 1931 1,954,863 Coles et al. Apr. 17, 1934 1,964,269 Munz June 26, 1934 2,338,273 Wilkins Jan. 4, 1944 2,386,918 Timpson Oct. 16, 1945 2,605,143 Bishop July 29, 1952 2,626,836 Herron Jan. 27, 1953 2,785,005 Thompson Mar. 12, 1957 2,837,323 Goodrie June 3, 1958

Claims (1)

1. IN A PART-CIRCLE SPRINKLER: A HEAD MEMBER COMPRISING A BODY HAVING AN INLET PASSAGE LEADING UPWARDLY THEREIN AND COMMUNICATING WITH A SPRAY NOZZLE; A TUBULAR SUPPORT FOR SAID HEAD ADAPTED FOR CONNECTION TO A FLUID SUPPLY; ANNULAR PROJECTING MEANS ON SAID HEAD MEMBER SURROUNDING THE INLET END OF SAID INLET PASSAGE FOR DEFLECTINGLY DIFFUSING THE FLUID AT SAID INLET END; AND A BAFFLE WALL IN SAID SUPPORT IN THE FLUID FLOW PATH TO SAID INLET PASSAGE AHEAD OF SAID MEANS, SAID WALL HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED FLOW OPENINGS THEREIN OUTWARDLY SPACED FROM SAID ANNULAR PROJECTING MEANS, WHEREBY FLOW FROM SAID FLOW OPENINGS TO SAID INLET END WILL BE SUBSTANTIALLY RADIALLY INWARDLY, SAID WALL BEING RELATIVELY MOVABLE TOWARDS AND AWAY FROM SAID INLET PASSAGE TO CONTROL THE FLUID FLOW THERETO.
US3085754A 1960-10-04 1960-10-04 Half-circle sprinkler head Expired - Lifetime US3085754A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151812A (en) * 1962-05-16 1964-10-06 Friend Mfg Corp Pesticide distributing apparatus with augmented air blast pattern
US3375981A (en) * 1965-11-19 1968-04-02 Julian W. Keck Apparatus for cleaning and inhibiting corrosion in air preheaters and the like
US3385525A (en) * 1967-03-16 1968-05-28 Arthur W. Jacobs Lawn sprinkler
US4206877A (en) * 1977-07-29 1980-06-10 Hoza Philip J Iii Water mist generator
US4768715A (en) * 1987-03-24 1988-09-06 Brian Sali Vehicle mountable liquid spray system
US5190222A (en) * 1991-06-14 1993-03-02 Spraying Systems Co. Spray nozzle with recessed deflector surface
US5275340A (en) * 1991-06-14 1994-01-04 Spraying Systems Co. Spray nozzle with recessed deflector surface
US5333794A (en) * 1991-06-14 1994-08-02 Spraying Systems Co. Spray nozzle with recessed deflector surface and mounting assembly thereof
US20020053609A1 (en) * 2000-11-09 2002-05-09 Han Joseph U. Nozzle device for spraying defined areas
US20030146303A1 (en) * 2002-02-06 2003-08-07 Johnson Thomas Les Spray nozzle
EP1170058A3 (en) * 2000-07-07 2003-09-17 Lechler GmbH & Co.KG Spray nozzle for fan shaped sprays
US20040021007A1 (en) * 2002-08-01 2004-02-05 Hakala John E. Nozzle deflector element
US20060049273A1 (en) * 2004-05-06 2006-03-09 Richard Zhang Flush cap with shut-off for sprinker head
US7021563B1 (en) * 2004-06-30 2006-04-04 Benjamin Franklin Rabitsch Spray nozzle with adjustable and removable diffuser
US20070069047A1 (en) * 2005-09-23 2007-03-29 Spraying Systems Co. Multiple discharge orifice spray nozzle
US20070095956A1 (en) * 2005-10-27 2007-05-03 Swan Trevor W Spray nozzle apparatus and method
US20080116298A1 (en) * 2006-10-06 2008-05-22 Langiewicz Craig A Spray Nozzle
US20100294851A1 (en) * 2009-01-29 2010-11-25 Thomas Les Johnson Spray nozzle for low clearance spraying
CN102861681A (en) * 2012-10-16 2013-01-09 中国矿业大学 Arc fan nozzle used for reducing dust

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US264317A (en) * 1882-09-12 Hose-nozzle
US1507350A (en) * 1922-06-28 1924-09-02 Eric T Franzen Sprinkler head
US1559655A (en) * 1923-01-16 1925-11-03 Walter Van E Thompson Sprinkler head
US1625042A (en) * 1926-02-06 1927-04-19 Michael W Mcardle Spray nozzle
US1837575A (en) * 1929-11-18 1931-12-22 Elmer G Munz Spray head
US1954863A (en) * 1931-03-09 1934-04-17 Skinner Irrigation Company Sprinkler
US1964269A (en) * 1931-12-21 1934-06-26 Elmer G Munz Spray head
US2338273A (en) * 1942-06-10 1944-01-04 Walter D Wilkins Spray nozzle
US2386918A (en) * 1941-10-31 1945-10-16 Pyrene Dev Corp Method and apparatus for projecting liquid jets
US2605143A (en) * 1947-05-27 1952-07-29 James S Bishop Hose nozzle
US2626836A (en) * 1949-11-16 1953-01-27 Goodrich M Sullivan Sprinkler head
US2785005A (en) * 1956-03-02 1957-03-12 Walter Van E Thompson Half-circle sprinkler head
US2837323A (en) * 1955-06-16 1958-06-03 Wrightway Engineering Co Hose nozzle with aerator

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US264317A (en) * 1882-09-12 Hose-nozzle
US1507350A (en) * 1922-06-28 1924-09-02 Eric T Franzen Sprinkler head
US1559655A (en) * 1923-01-16 1925-11-03 Walter Van E Thompson Sprinkler head
US1625042A (en) * 1926-02-06 1927-04-19 Michael W Mcardle Spray nozzle
US1837575A (en) * 1929-11-18 1931-12-22 Elmer G Munz Spray head
US1954863A (en) * 1931-03-09 1934-04-17 Skinner Irrigation Company Sprinkler
US1964269A (en) * 1931-12-21 1934-06-26 Elmer G Munz Spray head
US2386918A (en) * 1941-10-31 1945-10-16 Pyrene Dev Corp Method and apparatus for projecting liquid jets
US2338273A (en) * 1942-06-10 1944-01-04 Walter D Wilkins Spray nozzle
US2605143A (en) * 1947-05-27 1952-07-29 James S Bishop Hose nozzle
US2626836A (en) * 1949-11-16 1953-01-27 Goodrich M Sullivan Sprinkler head
US2837323A (en) * 1955-06-16 1958-06-03 Wrightway Engineering Co Hose nozzle with aerator
US2785005A (en) * 1956-03-02 1957-03-12 Walter Van E Thompson Half-circle sprinkler head

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3151812A (en) * 1962-05-16 1964-10-06 Friend Mfg Corp Pesticide distributing apparatus with augmented air blast pattern
US3375981A (en) * 1965-11-19 1968-04-02 Julian W. Keck Apparatus for cleaning and inhibiting corrosion in air preheaters and the like
US3385525A (en) * 1967-03-16 1968-05-28 Arthur W. Jacobs Lawn sprinkler
US4206877A (en) * 1977-07-29 1980-06-10 Hoza Philip J Iii Water mist generator
US4768715A (en) * 1987-03-24 1988-09-06 Brian Sali Vehicle mountable liquid spray system
US5275340A (en) * 1991-06-14 1994-01-04 Spraying Systems Co. Spray nozzle with recessed deflector surface
US5190222A (en) * 1991-06-14 1993-03-02 Spraying Systems Co. Spray nozzle with recessed deflector surface
US5333794A (en) * 1991-06-14 1994-08-02 Spraying Systems Co. Spray nozzle with recessed deflector surface and mounting assembly thereof
EP1170058A3 (en) * 2000-07-07 2003-09-17 Lechler GmbH & Co.KG Spray nozzle for fan shaped sprays
US6837448B2 (en) * 2000-11-09 2005-01-04 Streamtech, Inc. Nozzle device for spraying defined areas
US20020053609A1 (en) * 2000-11-09 2002-05-09 Han Joseph U. Nozzle device for spraying defined areas
US7487924B2 (en) 2002-02-06 2009-02-10 Thomas Les Johnson Spray nozzle
US20040227015A1 (en) * 2002-02-06 2004-11-18 Johnson Thomas Les Spray nozzle
US20110036920A1 (en) * 2002-02-06 2011-02-17 Thomas Les Johnson Spray nozzle
US8328112B2 (en) 2002-02-06 2012-12-11 Thomas Les Johnson Spray nozzle
US7108204B2 (en) * 2002-02-06 2006-09-19 Thomas Les Johnson Spray nozzle
US20030146303A1 (en) * 2002-02-06 2003-08-07 Johnson Thomas Les Spray nozzle
US7780093B2 (en) 2002-02-06 2010-08-24 Thomas Les Johnson Spray nozzle
US6962299B2 (en) 2002-08-01 2005-11-08 Hakala John E Nozzle deflector element
US20040021007A1 (en) * 2002-08-01 2004-02-05 Hakala John E. Nozzle deflector element
US20060049273A1 (en) * 2004-05-06 2006-03-09 Richard Zhang Flush cap with shut-off for sprinker head
US7021563B1 (en) * 2004-06-30 2006-04-04 Benjamin Franklin Rabitsch Spray nozzle with adjustable and removable diffuser
US7380732B2 (en) 2005-09-23 2008-06-03 Spraying Systems Co. Multiple discharge orifice spray nozzle
US20070069047A1 (en) * 2005-09-23 2007-03-29 Spraying Systems Co. Multiple discharge orifice spray nozzle
US7584908B2 (en) 2005-10-27 2009-09-08 Sta-Rite Industries, Llc Spray nozzle apparatus and method
US20070095956A1 (en) * 2005-10-27 2007-05-03 Swan Trevor W Spray nozzle apparatus and method
US20080116298A1 (en) * 2006-10-06 2008-05-22 Langiewicz Craig A Spray Nozzle
US7806350B2 (en) 2006-10-06 2010-10-05 Langiewicz Craig A Spray nozzle
US20100294851A1 (en) * 2009-01-29 2010-11-25 Thomas Les Johnson Spray nozzle for low clearance spraying
US8668153B2 (en) 2009-01-29 2014-03-11 Udor U.S.A. Inc. Spray nozzle for low clearance spraying
CN102861681A (en) * 2012-10-16 2013-01-09 中国矿业大学 Arc fan nozzle used for reducing dust
CN102861681B (en) * 2012-10-16 2015-03-04 中国矿业大学 Arc fan nozzle used for reducing dust

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