DE1919581A1 - Hydraulic method and device for dispensing granular material under pressure - Google Patents

Description

CHALHSWüE-COOk BROS., INCORPORATED, INDUSTRY / Calif ./USA

Hydraulic method and device for dispensing granular material under pressure

The invention relates to a hydraulic Sandverteileiη direction, such as a hydraulic sandblower that is used to clean and remove paint from objects and used for etching.

Earlier hydraulic sandblowers and similar hydraulic sand spreading devices were used mostly use a venturi or spray nozzle device to direct the sand material for spraying with a Mix liquid stream. For example, it is already known to use a spray nozzle device or a venturi device to use for this purpose. However, both types of devices are relatively complex, expensive, inflexible and difficult to use.

009845/0771

rig to control. Another disadvantage of a venturi device is that it becomes clogged with the sand material and wears out quickly. Another earlier type of hydraulic sand distribution used a pump to suck the water and the sand distributed in it from a container # However, such an arrangement requires an element such as an agitator to move the sand in the water to keep distributed and also to pull the mixture of sand and water through the pump, causing the pump is extremely heavily worn.

The apparatus of the present invention overcomes those Problems of cost, complexity, wear and tear and lack of flexibility of the prior art.

According to the present invention, this is achieved by the following Working steps: Bringing a quantity of the sand material into a pressure-tight container, guiding one under Pressurized flow of the liquid from a source outside the container through a flow path below the sand material and in connection with the same and from there to a delivery point outside the container, and maintaining a pressure of the liquid current approximate liquid pressure in the container during the flow of the liquid.

Further details of the invention are to be explained and described in more detail using exemplary embodiments, reference being made to the accompanying drawings.

009845/0771

-3-BATH ORIGINAL

^ 1918S81

Fig. 1 is a predominantly sectioned side view. -. ^; an embodiment according to the invention _;

Fig. 2 is a partially sectioned side view of a second embodiment of the invention, and

Fix. 3 is a partially enlarged sectional view and FIG shows the perforated tube of Fig. 2 and its connection to the container of the device.

1 shows a form of the device according to the invention including a cylindrical pressure vessel 10 with a flat bottom 12 and an upper opening closed with a cover 14. The cover is fastened by screws la to an annular flange 16 of the iefä: 5es. A covering 20 lying between the cover and the flange results in a pressure-tight seal. Y.el the _t DEK has a EinfüHoffnung 22 through which the boiler with a polynuclear material, such as the sand 2 ^ present in the vessel may-be filled. The filling opening is normally closed by a screw-on filler neck 26 during operation. An air tube 25 extends right up to the second opening in the cover and can be closed by a manually operated valve 30.

The equipment also includes a liquid pressure system with a line for the pressurized liquid. The line extends from a pressurized liquid source to an outlet. The line includes a pipe, generally designated 32, which is connected at one end to a liquid pump 3 ^ and at the other end to a nozzle 36 located at the outlet. A first part of the pipeline is itself

BAP ORIGINAL
; ; 'äj 009845/0771

from the pump to one just upstream of the tank located T-piece 38 extending pipe section 32a. The pipeline divides into two at this T-piece Pipe branch sections * of which the first 32b extends horizontally extends over and across the vessel and the other 32c extends vertically downward through a Opening 40 in the lid extends into the vessel. The equivalent section 32c ends near the bottom of the kettle in a 90 ° knee 42 to which a perforated Pipe section 44 connects, which extends just above the bottom 12 from one side of the container to an opposite one Side of the same extends and finally ends at another 90 ° knee 46. Extends from the knee 46 a vertical pipe section 32d extends up and through the cover l4 to a second T-piece 48. The T-piece is at the same time the downstream end of the pipe branch section 32b .. After the T-piece 46, the flow mixes of both branches and flows downstream through a common, pipe outlet section 32e which at 50 connects to a flexible hose 52 is coupled, at its outlet end a nozzle 36 is located.

In the container traversing branch pipeline 32b is a manually moving control and shut-off valve 54. A second ¹ of the hand moving the control valve 56 is provided in the branch line 32c, which leads into the container and to the durchlöchertm pipe section 44th These two valves are used to _: Control and change the currents flowing through the two branches and, if desired, can also direct the current only through one or the other branch. .-...,. ·., -

009845/0771

To operate the apparatus of Fig. 1, the filler neck 26 is removed and the container is at least partially filled with sand or any other desired granular material, depending on the end use for which the device is to be used put on again, the valve 30 on the air tube opened, the valve 54 closed and the valve 56 opened, so that first the entire flow is slid through the perforated pipe section 44 and into the container. Preferably, nozzle J6 is also closed so that the container quickly fills with the liquid flowing through holes 58 in tube section 44. After the container has filled with liquid, the valve 30 is closed so that the hydraulic pressure in the container approximates that of the line. The valves 54 and SS are adjusted so that the desired proportion of the total flow flows through the perforated pipe section 44. Then, after the liquid has continued to flow through the branch conduit 32c and the perforated branch section, granular material penetrates from the container into the liquid stream, by which it is carried on and carried to the nozzle. At the T-piece 48, the flow carrying the sand mixes with the existing additional flow from the secondary line 32b.

In the case of static hydraulic conditions, the same would be in the perforated pipe section and in the container Pressure prevail. When the liquid flows through the perforated pipe section to the nozzle, however, "the Holes created a slight pressure differential due to the flow through the perforated pipe section.

-6- 009845/0771

It is believed that the slight pressure reduction inside the pipe plus that on the sand Gravity causes the sand towards the holed Section and into it. In the latter very satisfactory slide mixing takes place regardless of the absence of any venturi or nozzle device The transport of the sand continues until the level of the granular material in the container approaches the bottom of the same. Bas concentration ratio of the land or other material in the liquid is controlled by changing the flow rate through the perforated pipe section. The more of the total of the liquid flowing through the perforated pipe section, the higher the sand concentration in the total flow at the nozzle »

The concentration of sand in the final spray can also be done by changing the size of the holes 55 in the perforated pipe section · The larger the holes, the greater the amount of grain that is in penetrates the perforated pipe section. It has been found, however, that generally and depending on the size of the Grains have the tendency of the perforated pipe to clog themselves with growing beyond a certain extent The size of the holes increases.

For example, in a *! and test equipment fed with ordinary sand, the perforated pipe section had an inside diameter of 1.91. , cm (3 "/ ^ inch) and holes spaced around the circumference of the perforated pipe section. The device was found to work best when the cross-sectional sizes of the holes were between 0.16 cm and 0.64 cm ( l / l6 to i / 4 inch).

009845/0771 _{Μο 0RI <3 (NAL}

The cbLge test device was operated with a pump that at its outlet end releases 75.7 l of water in <fer minute (20 gpm) under a pressure of 31 »6 kg / cm (450 psi). A 3/4 inch (1.91 cm) inside diameter pipe was used for the entire system, with a hose ' 1.27 cm (1/2 inch) inside diameter and 0.4b cm (3/16 inch) nozzle. The container itself had an inside diameter of 30.48 cm (12 inches) and the interior of the vessel was 45.70 cm (18 inches) high. the The pump exit orifice was 1.27 cm (1/2 inch) inside diameter. When the two valves 54 and were wide open, the device emitted a jet of sand through the nozzle with a density of approximately 2% by weight of sand.

Figures 2 and 3 illustrate another commercially useful form of device with a particularly strong one StXahlgefä / 3 100, each with a curved upper and lower ends 102 and 104, a fill opening 106 and a filler neck 10c at the upper end and an outlet opening ItO and associated nozzle 112 is equipped at the lower end. At the top is also a closable air tube II4.

In this embodiment, a straight, perforated one Pipe section II6 at "its opposite end with axially aligned with external threads provided connecting pipe sections located on opposite sides of the vessel in the vicinity of each bottom 11. ·, 120 connected.

3 shows a more precise representation of the connecting pieces screwed into the receiving pieces 121, 122

BATH ORIGINAL .4.

0098Λ5 / 0771

11-, 120. The receiving pieces are on the outside of the Welded container and comprise the axially aligned openings 123, 12 ^ · in the container. That Connector 120 is internally threaded into which an externally threaded end 125 of the perforated tube 116 is screwed. The opposite guide piece 11t is at 126 with a smooth and slightly conically widening opening, into which a corresponding, sbh conical opening iüngenries end 127 of the perforated pipe lio exactly fitted isx.

A portion 130 of the inlet pipe is on his downstream end welded to connector 120 and at its upstream end connected to a pump (not shown). An outlet portion 132 of the tube is at its upstream End with the connector 110 on the container and at its downstream end - as in the embodiment 1 shown - connected to a flexible hose.

A branch pipe section 13 * 1 which is not perforated and which corresponds to the branch pipe section 32b in FIG. 1 also passes through an oven above the perforated section II6. The larger section 16 of branch line 13 is a simple piece of pipe welded to opposite sides of the container the branch line 13 * f · can be connected. The branch pipe section 134 is connected to the Ϊ pieces 138 and 139 to the main

uiut> outlet pipes 130 and 132 suitable »both

- 9— ■

the branch line 13 ^ as well as the line with the perforated Tubing sections 116 are outside the container , each with control valves 140, 142 to control both Branches providing amount of current flowing through · Another valve 144 is downstream of the perforated tube 116 and upstream of the tee 139. It is intended to prevent sand being drawn into the outlet opening 132 when an unmixed stream is freshening Water through branch line 134 is desired. The operation of the container of FIG. 2 is the same as that described with reference to FIG. at The illustrative commercial form of FIG. 2 is a 114 capacity container (30 gallons), an outside diameter of 40.64 cm (l6 inches) and a cylindrical area of 6.2 cm (30 inches) Height provided. The container is made of steel and is robust. against a boiler pressure of 42.2 kg / cm (600 psi). The filling opening has a diameter of 7.62 cm (3 inches) and the air hole a diameter of 5 »08 cm (2 inches). All pipes, including the perforated pipe section, are made of 1.91 cm (3 / ^ inch) pipe material. The holes in the perforated pipe section are 0.4d cm (3/16 inch) in diameter and are spaced 1.91 cm (3 / ^ inch) apart. There are four rows of spaced holes are provided around the circumference of the pipe, the holes of the adjacent rows are offset from one another.

It is to be understood that the preceding examples are only intended to illustrate and not to limit the invention are intended to serve, except in relation to what is contained in the claims. The perforated pipes point a constant diameter throughout,

-10- 00 9 8 4 5/0771 BAD

- ίο -

although this is not essential. The disadvantage of the invention consists in the fact that the being torn away from the sand does not depend on an `` enturi-effect ''. The perforated pipe sections of the two illustrated embodiments extend both horizontally, but it λ ^r nnt »also be possible dal" to extend in a slight inclination to the horizontal as long as they are approximately, running parallel to the container Boder, "vas As for this, is a predominantly horizontally attached perforated area a predominantly offsetting through. perforated pipe section is preferable. The latter would drastically reduce the efficiency of the device, since as the sand level in the container fell, more and more holes would be free above the sand, and the admixture in the spray liquid would be progressively reduced during a single blowing process. ^r M.re continued adjustment and frequent refilling needed.

The two illustrated embodiments lines zv / ar only the use of a single holed Pipe section, however, it should be noted be that v / enn a higher concentration of sand in the Spray liquid is desired than can be achieved with a single perforated section, several in the container perforated pipe sections attached parallel to each other Could find use, whose parallel flowing currents finally meet in a common outlet end could unite. The perforated ear sections can also make any number of holes - from a single hole to a multitude of holes - included, depending on the desired ion nitration of the granular material in the carrier liquid.

00984S / 0771 BAD ORIGINAL " ⁿ "

The device described is normally to be used with sand wrA ".r'a ~! 3 ^ r £". However, it should be noted: onr, ön warden, daö, every other liquid and every other material successful in the device according to the invention. I could find. The device has been used successfully, for example, with 3: i-remehl in the container and water as a carrier liquid. It is therefore not necessary

v / ν / «. Ία ig» because the granular material is shearer than the tear -. · -; «? rflüsai ^ 'Keit is if this is also to achieve a optimal performance is preferable. They actually are Substances soluble in water, such as detergents, have been used successfully in containers, and there will be assumed that the apparatus can also be used for this purpose. knew how to dispense a mixture of two different liquids. »-viie E.g. on the one hand water as carrier liquid and on the other hand, an insecticide as the material attached to the container 13 the device is however Primarily intended to use granular material of a liquid under high pressure for cleaning purposes broadcast.

A particular advantage of "Ausführungsforai ISTF shown 2 when a perforated pipe section" in FIG ait larger holes will gewünseht _t a perforated pipe section is easily and quickly .by to replace another aer with holes required G röSe-. * - * -. "■ ■. -

In a version of the process on which the present invention is based, it can be said that a continued flow of an inert liquid is provided through an internal bridge-going boiler which, with both a mixture of granular *, greater impermeability and the liquid material, as a suggestion of another

is filled, which is under a pressure which is approximated to the pressure of the stream, apart from the slight Pressure reduction due to the speed of the stream. The current flows under inside the vessel the granular material through, however, in its vicinity, and is separated from the same by a delimiting perforated layer, which is used to control the ratio serves, injdem the granular material is carried along by the current.

bath

- '"vitval ■. '■' -13-

0O9845 / Ö771

Claims (1)

- 13 claims 1. Method of dispensing sand material in a spray liquid for cleaning and other purposes, characterized by the following work steps ι Introducing a lot of the sand material in a pressure-tight Container, Passing a pressurized stream of liquid from a source external to the container a current path below the sand material and in connection with the same and from there to a delivery point outside of the container, and maintaining a liquid pressure in the container while the liquid is flowing. 2. The method according to claim 1, characterized by the step of burning the current path during the flowing of the sand material in the container by means of a perforated material in order to control the energy to be transported through the current path. 3. The method according to claim 1 or 2, marked calibration e t to keep the cross-section of the current path essentially uniform by the work step. 4. Dispensing device, marked by a a closed container (10, 100) containing a flowable solid or liquid material (24) and a self continuous conduit extending from a source of pressurized carrier fluid to an exit port (32) in which the container (10, 100) is pressure-tight during operation and the pipeline running through it (32) contains a perforated pipe section (44, 116), the holes (5ü) in connection with the interior of the 009845/0771 The container, so that the normal flow of the carrier liquid through the perforated Abschr.itx with continued Flow from the source to the outlet opening exv / as carried along by the flowable material (24) and what about the exit substance now ?; wearing. 5. Dispensing device according to claim 4, characterized in that the container (10, 100) has elements (23, 30 ». H4) for generating pressure inside the container and elements (22, 26, 106, 10 ä) for receiving granular material ( 24), and that the perforated pipe section (44, 116) extends generally horizontally in the container in the vicinity of the container bottom (12) in the direction of flow after the source and in front of the outlet opening. 6. Dispensing device according to claim 4 or 5, characterized in that -.-.-: e η η ζ e i c h η et, that the perforated Kohrabschnitt (44, 116) has an essentially uniform inside diameter, which is why the Grains through the fluid path within this section influencing Venturieffe.it does not occur. 7 »Dispensing device according to claim 4, 5 or 6, characterized in that the container (10, 100) an optionally closable air hole (28, 114) is located which, when open, allows the container to be filled allowed with liquid from the perforated pipe section (44, Il6) and in the closed state the Container under a pressure approximately approximating the pressure of the stream in the perforated pipe section puts. -15- 003845/0771 -. Dispensing device according to claims 5, 6 and 7, characterized in that the pipeline (32) contains a non-perforated branch pipe section (32b, 136) running parallel to the perforated pipe section, so that part of the flow flows through the latter past the perforated pipe section, and that the pipeline contains a further section downstream of the perforated and the branch section ('3Zq _t 132} which combines the flows of the branch section UHf? of the perforated section in front of the outlet opening v.leder. V · There would be se advises according to claim c ;, thereby ge ke η η s eich π et, daä; the pipeline (32) contains elements (5 ^ »56, 140, 1 ^ 2, IhH-) for controlling the distribution of the amount of jamal liquid flowing through to the perforated (Jh-, lib) and the branch pipe section (32b, 136). 10. Dispensing device according to claim 9, characterized in that g e k e η η ζ ei c h η e t that for the current control element a first Valve (5 ** »1 ^ 6) in. The branch pipe section and a two Valve (36, 1 ^ 2) in a parallel to the branch pipe section located and connected to the perforated pipe section pipe section (32c). 11 extends · Abgäbegerät according to any one of the preceding claims 4 to 10, characterized in that the perforated pipe section (116) is the same GEK en η ζ calibration η et through the container (100) from one side to the other and in that the device elements (118 , 120, IEi, 122) are provided for attaching the perforated section to the container on both sides of the same » ■ .-- ■ '. BADORIiSlNAl. 00984570771 12 «Dispensing device according to claim 11, characterized in that on the perforated pipe section (116) at its opposite end a thread (118, 120) and at the opposite end of the container (100) Threaded portions (121, 122) are provided for receiving the threaded ends of the perforated portion are. ■ 13 · Dispensing device according to one of the preceding claims ^ i to 12, characterized in that a pump (34) located upstream of the perforated pipe section (44-, 116), further a nozzle (36) at the outlet opening, the container (10, 100) at least partially filling granular material (24), a liquid which has a lower density than the granular material in the container and which is under a pressure which corresponds to that of the liquid pressures within the hydraulic fluid system, and that the holes in the perforated tube section have larger diameters than the grains located in the container, and that the holes are arranged over the entire circumference and the greater part of the length of the perforated tube section in the container. 14. Method of dispensing sand-like material in one Spray liquid as described above. 13. Device for dispensing sandy material under pressure, as above with reference to the accompanying drawings wrote. 009845/0771