Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3730040 A
Publication typeGrant
Publication dateMay 1, 1973
Filing dateAug 17, 1971
Priority dateAug 17, 1971
Publication numberUS 3730040 A, US 3730040A, US-A-3730040, US3730040 A, US3730040A
InventorsChadwick R, Robertson J
Original AssigneeBendix Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Energy absorber for high pressure fluid jets
US 3730040 A
Abstract
A device is disclosed for absorbing the energy of a fluid cutting jet after it has passed through the workpiece in order to reduce the sound level as well as the spray and vapor normally accompanying the fluid jet cutting process. The device includes a baffle arrangement disposed immediately adjacent the workpiece and enclosed in a housing to receive and contain the jet after it has passed through the workpiece so as to prevent the sonic energy and spray from emanating into the surrounding environment. The jet itself is directed through the baffle arrangement to impact a liquid bath, backed up with a hardened steel block, thereby dissipating its momentum.
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

United States Patent 1 1 1111 ma am Chadwick et al. 1 May 1, R973 ENERGY ABSORBER FOR HIGH 3,553,895 1/1971 Power ..51/321 x PRESSURE FLUID JETS 3,212,378 10/1965 Rice 83/177 x Filed:

Inventors: Ray F. Chadwick, Troy; John H.

Robertson, Detroit, both of Mich.

Assignee: The Bendix Corporation,

Southfield, Mich.

Aug. 17, 1971 Appl. No.: 172,530

References Cited UNITED STATES PATENTS 2/1946 5/l96l 7/l962 12/1958 Hutt ..83/1 77 X Schwacha 1 ..83/177 X Gilman et a].... ..83/l77 Kalwaitas ....83/53 X Primary Examiner l. M. Meister Attorney-John R. Benefiel et al.

[57] ABSTRACT A device is disclosed for absorbing the energy of a fluid cutting jet after it has passed through the workpiece in order to reduce the sound level as well as the spray and vapor nonnally accompanying the fluid jet cutting process. The device includes a baffle arrangement disposed immediately adjacent the workpiece and enclosed in a housing to receive and contain the jet after it has passed through the workpiece so as to prevent the sonic energy and spray from emanating into the surrounding environment. The jet itself is directed through the baffle arrangement to impact a liquid bath, backed up with a hardened steel block, thereby dissipating its momentum.

14 Claims, 2 Drawing Figures Patented May 1, 1973 3,71%,040

liiiil; 9 rl I F "l NW,

AHHH Mini;

FIG. 8

INVENTORS RAY F CHADW/CK ay/v H. ROEERTSOA/ ENERGY ABSORBER FOR HIGH PRESSURE FLUID JETS BACKGROUND OF THE INVENTION 1. Field of the Invention This invention concerns devices for the absorption of the energy of a-high pressure jet discharging into the atmosphere, and more particularly such jets used in fluid jet cutting processes.

2. Description of the Prior Art Fluid jet cutting systems have been proposed in the past and have been demonstrated to be highly effective for certain applications. In these systems, a fluid such as water is discharged through a nozzle at extremely high pressures ranging from 10,000 to 100,000 psi to impact a workpiece and shear it by the high kinetic energy of the jet. In such systems, the process is normally carried out in the open, and the extremely high jet velocities (may be on the order of 3,000 ft/sec) can cause noise levels to reach 140 decibels in the immediate vicinity of the jet. This level intensity must be regarded as highly undesirableand contrary to the interests of operator comfort and efficiency.

In addition, the high energy of the jet must be somehow absorbed to minimize the danger of accidental impacting of the jet with persons or equipment, and the fluid itself collected for disposal.

Prior art systems are disclosed in US. Pat. Nos. 3,212,378 and 2,985,050 have attempted to meet these latter needs by the use of a disposal tank containing a liquid bath, which may be backed up by a resilient cushion to absorb the jet energy.

The resilient cushion, however, is likely to be a high maintenance item as it is very easily degraded by the jet action, and none of the prior. art systems provides for the former problem, i.e., the noise created by the jet.

Therefore, it is an object of the present invention to provide an energy absorber for such a fluid jet which substantially reduces the noise level associated therewith and does not involve excessive maintenance of its component parts.

SUMMARY OF THE INVENTION This and other objects which will become apparent upon a reading of the following specification and claims are accomplished by providing a baffle arrangement contained in a housing enclosing the jet immediately upon its exit from the workpiece area and impacting the jet upon a liquid bath backed up by a hardened steel block.

DESCRIPTION OF THE FIGURES FIG. 1 is a sectional view of an energy absorber according to the present invention.

FIG. 2 is a sectional view of an alternate embodiment of the energy absorber according to the present invention.

DETAILED DESCRIPTION In the following detailed description, certain specific terminology will be utilized for the sake of clarity and specific embodiments will be described in order to provide a complete understanding of the invention, but it is to be understood that the invention is not so limited and may be practiced in a variety of forms and embodiments.

Referring to the drawing and particularly FIG. 1, a nozzle tip 10 is depicted disposed to direct a jet 12 of a liquid such as water against a workpiece 14 which is moved past the jet 12 to produce a cutting action thereon. After passing through the workpiece 14, the jet is directed via opening 16 in the workpiece support 18 to the energy absorber 20 disposed immediately proximate to the exit point of the jet 12.

The energy absorber 20 includes a housing 22 supported on a base 24 and closed at one end by means of a top plate 26 retained by an end cap 28. The top plate 26 has an opening 30 formed therein to allow the jet 12 to pass into the housing cavity 32 while reducing the volume of material removed from the workpiece to be carried thereinto.

Disposed within the uppermost region of the housing cavity 32 is a baffling arrangement consisting of a volume of a resilient material 34 such as foam rubber having a passage 36 formed therein by the initial action of the fluid jet and retained in a holder 38 also having an opening 40 formed therein, with opening 40 being aligned with the jet 12 to allow it to pass therethrough.

The volume of resilient material 34 functions to prevent the emanation of spray and sonic energy from the interior of the absorber into the surrounding environs so as to drastically reduce the noise level accompanying the operation of the device.

The jet 12 then passes into an open space 42, then into a space 44 containing a liquid such as water where a portion of its energy is absorbed, and finally impacts a hardened steel impact block disposed at the bottom of space 44 which absorbs the residual energy of the jet 12.

The overflow created by the liquid which forms the jet 12 is disposed of via vent and overflow outlet 48 which leads to a drain.

The passage of the jet through the volume of water in space 44 functions to further reduce the noise level as the Mach number of the jet is greatly reduced in water, and its kinetic energy is also considerably reduced by friction and fluid entrainment before impacting the hardened steel impact block 44 to lessen the erosive effect the jet 12 may have thereon. I

The impact block 44 may be of other suitably hard material capable of resisting the erosive action of the jet such as tungsten carbide.

The impact block 44 may be replaced as may also the volume of resilient material if erosive wear has been substantial.

As the jet 12 is totally contained after entering the energy absorber 20, it can be appreciated that sound, spray, and vapor are greatly reduced by its use.

A second embodiment is depicted in FIG. 2, and is substantially the same as that depicted in FIG. 1 with the exception of the baffling arrangement which in this embodiment consists of a series of frusto-conical baffle plates 50 with respect to back spray of the jet, having openings 52 disposed in the holder 38 and positioned by means of spacers 54. It has been found that the reversely sloping orientation of the baffle plates 50' prevents sound, spray, and vapor from passing back out the entrance opening 30 as these tend to be trapped thereby and confined in the housing 22, while eliminating any need to service the device, as no significant erosion of the frusto conical baffle plates 50 normally occurs during reasonable maintenance intervals.

From the above description, it can be appreciated that the usefulness of the jet cutting systems can be substantially enhanced by the use of the energy absorber according to the present invention, and that this device is simple and relatively inexpensive to fabricate.

Many variations are of course possible within the scope of this invention.

What is claimed is:

1. An energy absorber for receiving a high velocity jet of liquid comprising:

-a housing disposed to receive said high velocity jet and substantially enclose it;

means within said housing to absorb said high velocity fluid jet energy, including baffle means surrounding said fluid jet after it enters said housing and preventing sound and spray from passing back out of said housing, comprising a volume of resilient material having a passage therethrough to receive said jet whereby sound and spray from said jet is substantially prevented from passing into the surrounding environment.

2. The absorber of claim 1 wherein said means to absorb said fluid jet energy includes a liquid bath disposed to be impacted by said fluid jet.

3. The absorber of claim 2 wherein said means to absorb said fluid jet energy further includes a block in said liquid bath disposed to be impacted by said fluid jet after passing through said liquid bath.

4. In a system for fluid jet cutting wherein a high velocity jet is directed at a workpiece to sever the same, the improvement comprising:

energy absorbing means including a housing disposed to receive and substantially contain said fluid jet immediately after passing through said workpiece and also including means in said housing to absorb the energy of said fluid jet including baffle means surrounding said fluid jet after it enters said housing and preventing sound and spray from passing back out of said housing, comprising a volume of resilient material having a passage therethrou gh to receive said jet.

5. The system of claim 4 wherein said means to absorb said fluid jet energy includes a liquid bath disposed to be impacted by said fluid jet.

6. The system of claim 5 wherein said means to absorb said fluid jet energy further includes a block in said liquid bath disposed to be impacted by said fluid jet after passing through said liquid bath.

7. An energy absorber for receiving a high velocity jet of liquid comprising:

a housing disposed to receive said high velocity jet and substantially enclose it;

means within said housing to absorb said high velocity jet energy, including baffle means surrounding said fluid jet after it enters said housing and preventing sound and spray from passing back out of said housing, comprising a plurality of baffle plates each having an opening aligned with each other to receive said jet.

8. The absorber of claim 7 wherein said means to absorb said fluid jet energy includes a liquid bath disposed to be impacted by said fluid jet. 1

9. The absorber of claim 8 wherein said means to absorb said fluid jet energy further includes a block in said liquid bath disposed to be impacted by said fluid jet after passing through said liquid bath.

10. In a sys em for fluid et cutting wherein a high velocity jet is directed at a workpiece to sever the same, the improvement comprising:

energy absorbing means including a housing disposed to receive and substantially contain said fluid jet immediately after passing through said workpiece and also including means in said housing to absorb the energy of said fluid jet including baffle means surrounding said fluid jet after it enters said housing and preventing sound and spray from passing back out of said housing, comprising a plurality of baffle plates each having an opening aligned with each other to receive said jet.

1 1. The system of claim 10 wherein said means to absorb said fluid jet energy includes a liquid bath disposed to be impacted by said fluid jet.

12. The system of claim 1 1 wherein said means to absorb said fluid jet energy further includes a block in said liquid bath disposed to be impacted by said fluid jet after passing through said liquid bath. a

1 3. The system of claim 10 wherein said series of baffle plates slope reversely with respect to the direction of back spray from said jet.

14. The system of claim 13 wherein said reversely sloping series of baffle plates are frusto-conical in shape.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2395123 *Apr 13, 1945Feb 19, 1946Schick IncSheet metal piercing
US2862251 *Feb 23, 1956Dec 2, 1958Chicopee Mfg CorpMethod of and apparatus for producing nonwoven product
US2985050 *Oct 13, 1958May 23, 1961North American Aviation IncLiquid cutting of hard materials
US3041906 *Aug 14, 1959Jul 3, 1962Olin MathiesonExplosive hole forming apparatus
US3212378 *Oct 26, 1962Oct 19, 1965Union Carbide CorpProcess for cutting and working solid materials
US3553895 *Nov 20, 1967Jan 12, 1971Power Bruce WHydraulic surface conditioning machine
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3978748 *Dec 30, 1975Sep 7, 1976Camsco, Inc.Fluid jet cutting system
US4137804 *Oct 7, 1977Feb 6, 1979Gerber Garment Technology, Inc.Fluid cutting jet receiver
US4463639 *Jun 22, 1982Aug 7, 1984Gerber Garment Technology, Inc.For cutting sheet material
US4532949 *Sep 29, 1982Aug 6, 1985The Boeing CompanyEnergy absorber for high energy fluid jet
US4620466 *Oct 16, 1984Nov 4, 1986Societe Nationale Industrielle Et AerospatialeCutting machine
US4790224 *Aug 20, 1987Dec 13, 1988Belcan CorporationTravelling gap conveyor cutting method and apparatus
US4864780 *Nov 27, 1988Sep 12, 1989Flow Systems, Inc.Energy-dissipating receptacle for high velocity fluid jets
US4964244 *Dec 2, 1986Oct 23, 1990Flow Systems, Inc.Energy dissipating receptacle for high-velocity fluid jet
US5127199 *Jan 8, 1991Jul 7, 1992Progressive Blasting Systems, Inc.Abrasive water jet catch tank media transporting means
US5349788 *Oct 14, 1993Sep 27, 1994Saechsishe Werkzeug Und Sondermaschinen GmbhApparatus for catching residual water jet in water jet cutting apparatus
US5505653 *Oct 14, 1993Apr 9, 1996Saechsische Werkzeug Und Sondermaschinen GmbhAbrasive/water jet cutting apparatus
US5831224 *Jul 29, 1996Nov 3, 1998Design Systems, Inc.Noise reduction system for fluid cutting jets
US5980372 *Nov 25, 1997Nov 9, 1999The Boeing CompanyCompact catcher for abrasive waterjets
EP2676738A1Jun 10, 2013Dec 25, 2013General Electric CompanyModule for a device generating at least one water curtain and corresponding device
WO2008043335A1 *Sep 28, 2007Apr 17, 2008Reinhard DiemCatching device and method for catching the cutting beam of a water jet machining device
Classifications
U.S. Classification83/177
International ClassificationB26F3/00, B24C9/00
Cooperative ClassificationB24C9/00, B26F3/008
European ClassificationB26F3/00C2, B24C9/00