US2362447A - Grease interceptor - Google Patents

Description

Nov. 14, 1944. E w N, BQQSEY4 v2,362,447 GREASE INTERCEPTOR Original Filed April 29, 1940 A INVENTOR.

Patented Nov. 14, 1944 UNITED STATE s PATENT oF FICE GREASE INTERCEPTOR Edward W. N. Bosey, Detroit, Mich.

' Continuation of application Serial' No. 332,169, April 29, 1940. This application September .30,

. 1943, Serial No. 504,499

l11 claims. (c1: aro-56)' to .cause the greases to rise to the surface of .the

water in the body of the interceptor and means for'withdrawing the oils and greasesfrom the interceptor separately from .the water.

It is further an object `and feature of the invention to provide an interceptor including a chambered body into which water containing oils and greases is to be discharged andv anoutlet associated with which is ameans -for discharging the gases accumulating in theibody to the outlet, said means including a trap and functioning .to prevent siphonage of the vcontents of thev interceptor and a skimmer to which oils and greases at the surface of theliquid may flow.

An additional object and feature ofthe invention is to provide a grease interceptor having an inlet adjacent the bottom on one sideand an outlet on the other, which outlet extends to a point f for determining theminimum liquid level `in the interceptor and between` the inlet and outlet a partition like element recessed 'to receive the -inowing water and grease yand providing a vtime period permitting greases to rise to the surface of the liquid and Water to discharge ybeneath the partition-like element to the outlet.

These and other objects and various novel features of the invention are hereinafter more fully described and claimed, and the preferred form of construction of a grease interceptor embodying my invention is shown in the accompanyingdrawing in which- Fig. 1 is a plan view of my improved grease interceptor partly broken away to show internal construction.

Fig. 2 is a vertical section thereof `taken on line 2 2 of Fig. 1.

Fig. 3 is an elevation taken from the outletside of the interceptor and partlybroken away to show the skimmer.

Fig. 4 is a sectional elevation taken on linev 4 4 of Fig. 2 showing the skimmer in elevation.

In its preferred form, my limproved *interceptor consists of a chambered body I having an. inturned ange 2 at the top -to receivea cover v3 which may be sealed to prevent an escape of gases Afrom the container as by a sealing material in the space 4 between the edge of the vcover and the :walls of the` body at the ;top. :On oneside and adjacent thevbottom of the body is -an inlet ,5 land on the ,oppOSiteside is anv outlet Iconduit 6 preferably lextending Iupwardly exteriorly of the body and vformed with an youtturned Aend portion Tand determining the minimum liquid level at about the vdotted line 8, A partition 9 extends transversely of the body at a right angle tothe axis of the inlet 'and this partition .engages opposite sidewalls of the body -and is formed with a depending bottom .edge vpor-tion Ill spaced from the bottom v,wall I-I ofthe body which bot-tom wall isy preferably `inclined downwardly to the outlet.

Above this terminal bottom edgeportion ID, the partition is -formed with abend providingy a recess 12.

Iheibottom Wall I3 of vtherecess is downwardly inclined. in respect yto the horizontal and tho upper portion 4Ill is upwardly inclined in respect tothe vertical and the partition extends v,verti- Gally .upwardlrirom Vtho upper ond of the portion I4. l

Theplane of said Verticalportionis materially inwardly of the-plane occupied by the bottom edge portion .I0 of -tlie partition. The bottom portion l0 slspaced from the wall ofthe body adjacent the inletproviding ya narrow kc lriannel l5.

Fluidcontaining water, oils and greases discharging into the body through `tho .inlet flows at a -suiiiciently rapid rate to be projected .into the-recessglz and to ,be theredeflected upwardly by the 4 shape ofthe walls formingthe recess-.thus providing ,opportunity zand time period for ,th greases and oils to rise `tothe surface of the Water between the lpartition-9 and the wall on the inlet sidepftheinterceptor,andfor water to pass out,- wardly through the channel I 5 and along ,the bot,- tom-.I I rto theoutlet. I n the passage of the-Water from beneath the .Wall i0 `of .the partition ,to the outlet,still.further opportunity for Vriseof greases isuprovlded.

In Athe discharge of liquid containing oils `and greases ,into the interceptor, la rise in levelof `the liquid in Ythe interceptor is caused and the Lupper edgeyofithe'vpartition member. 9v is -formed .with a comparatively narrow-'slot I 6, the lbottom edgeof which is slightly above -theglevel of ftheliqlld.

With 1the `water and oils discharging into the interceptorfon the inlet side of the partition, a comparatively rapid rise in the leveliof the liquid in gthecha-mber .-I;'I `between the partition `and `the inletsideofthe interceptoris caused and theoils thereinwill begin to Dass'through-the slot I'6 to the mainfchamber :I8 of the interceptor and, dependingupon fthe quantityof liquid discharging, thelevel of lthe liquid inthe chamber `II between carrying the greases and oils with the water beneath the lower edge I of the partition and thence to the outlet.

In a grease interceptor, there are always some gases forming in the body and air discharged into the body above the liquid level which ordi-y narily would produce pressure in the chamber and, to prevent an accumulation of gases in the upper part of the body, I provide a trap, one leg I9 of which extends preferably interiorly of the body and is open at the top above the level 'of the cover which is formed with a recess therefor and gases may pass into this leg of the trap. lThe other leg 2| of the trap extends to *the exterior of the interceptor and is open to the outlet ceptor substantially as shown. The wall 22 tends to confine the flow to the outlet in a stratum along the bottom I I of the body and liquid tending to flow to the outlet from above the wall 22 is deflected inwardly of the body and thus there is a tendency to agitate the liquid within the chamber I8 particularly adjacent the lower part thereof tending to permit any oils or greases still contained therein to pass upwardly in the body.

The oils and greases accumulate on the surface of the liquid in the body and` means is provided to draw off the oil. For this purpose, I provide what I have termed a skimmer 23 which has va shape in elevation as indicated in Fig. 3 and the skimmer has an upper edge 24 extending horizontally from side to side of the body just below the normal liquid level in the body. The skimmer is thus of shallow depth in its mid section indicated at 35 and increases in depth each side of the central portion to form the similar chambers 25 and 26. Thus the oils and greases will flow over into the skimmer or container which is formed at the greatest depth on each 'of the opposite sides of the device providing similar chambers 25 and 26. The wall of the receptencle on the outlet side is formed with a plugged opening 21 on one side and a draw 01T cock 28 is provided on the opposite side which may be of any approved form. The plugged opening 2I and the draw off cock 28 open to the respective chambers 25 and 26 to enable the liquid to be withdrawn from the skimmer. The plugged opening on the one side will permit access to the interior of the skimmer for removal of grease and the draw off cock may also be removed for the same purpose.

By the described arrangement of parts, a comparatively inexpensive structure is provided and may be cast 'in one piece if desired and as is shown. The partition member 9, however, may be removably mounted in position by provision of a lug 29 on the opposite side walls indicated by dotted lines in Fig. 2 and a pair of lugs 30 and 3l adjacent the top which would support a removable wall in the desired position.

It is further pointed out that it is not necessary to provide a partition extending the full width of the body as a lesser width of plate provided with a recess for the function described may be used.

The construction of a trap at the point of connection with the outlet is such as tox provide an opening having a removable plug 32 in alignment with the vertical portion of the outlet which permits access thereto and to the trap for the cleaning of the same.

It is also further desirable in some installations and sometimes required to provide a vent to atmosphere to 'prevent accumulation of gases in the body. For this purpose, I provide a wall of the body forming part of the conduit I9 of sunlcient thickness to permit the same to be tapped to receive a vent pipe 33 as shown in Fig. 2. With such a vent to atmosphere, gases in the upper part of the body may pass to the inlet 20 of the trapped vent I9v and thence to atmosphere through the pipe 33.

From the foregoing description, it is believed evident that the various features and objects of the invention are attained by the construction described which includes inexpensiveness of construction and a relationship of parts providing for an e'icient separation of the oils and greases from the water and the removal of gases from the body of the container as well as prevention of siphonage and it is pointed out that various Vchangesin the construction of the device may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

Having thus briefly described my invention, its utility and mode of operation, what I claim and desire to secure by. Letters Patent of the United States is:

1. In a grease interceptor, a chambered body having an inlet on one side near the bottom and an outlet on the opposite side opening to the body near the bottom and arranged to determine the minimum liquid level therein, 'a partition adjacent the inletr having a recess in its face opposite the inlet, the bottom wall of the recess being practicallyaligned with the lower side of the inlet,

and a bottom edge extending to close spaced re.

lation with and below the inlet and spaced from the bottom of the body, said recessed portion receiving the liquiddischarging into the body and shaped to deflect the same upwardly between the partition and the wall on the inlet side of the -body'lby force of inflow whereby the lighter oils and greases may have opportunity to rise to the lsurface-and the liquid andV water thus freed of matter having less specic gravity may pass beneath the partition to the outlet. l, v

2. In a grease interceptor, a chamberedv body having a bottom wall and an inlet on one side near the bottom wall and an outlet on the .opposite side at the bottom, said bottom wall being downwardly inclined from the inlet toward the outlet, a partition member within the body having the bottom edge thereof adjacent the inlet and spaced from the inlet wall and bottom wall ofthe body, an upper vertical portion spaced a greater distance from the inlet wall than Athe said lower edge, a curved portion providing a recess opposite the inlet and connecting the'said upper and lower portions of the partition where; by liquid flowing into the body through the inlet enters the'said recess and is deflected upwardly before passing beneath the partition thereby prof viding Aa Vtime interval permitting oils, greases,

etc., to pass to the top of the liquid in the body, saidoutlet being of a construction determining the minimum water .level and the upper edge of the partition member having a slot above the normal liquid level and through 'which the greasesl may pass on the .raising of the liquid level by inflowing liquid, said body having a cover in sealedrelation therewith preventing an escape of .gases from the top of the body, and a trap having a leg opening to the body above the liquid level, and a leg opening to the outlet belowthe normal liquid level.

f "3. In.a grease interceptor, a chambered body having a bottom wall, an inlet `on one side ofthe l bodynear the bottom wall thereof and an outlet I on the opposite side at the bottom, said bottom Awall being downwardly inclined from the inlet toward'the outlet, a partition member' within the body having the bottom edge thereof `adjacent theI inlet and spaced from the inlet walland bottom wall of the body, an upper vertical portion spaced a greater distance from the inlet wall than the said lower edge, a curved portion providing a recess opposite the inlet and connecting the said upper and lower portions of the partition whereby liquid owing into the body through theinlet enters the said recess and is deflected upwardly before passing beneath the partition upper. edge spaced fromthe cover and a portion of its face opposite/to the inlet and a bottom por# tion located below the inlet and spaced from the inlet lwall and from the .chamber bottom, that the heavier water beneath the partition toward the outlet y 6.v In a grease interceptor, a chambered-body thereby providing a time interval permitting oils,

greases etc., to pass to the top of the liquid in the body, said outlet being of a construction determining the minimum Water level and the upper edge of the partition member having a slot above the normal liquid level andvthrough which the greases may pass on the raising'of the liquid level by iniiowing liquid, said body having a cover in sealed relation therewith preventing an escape of .gases from the top of the body, a trap having a leg opening to the body above the liquid level, and a leg opening to the outlet below the normal liquid level, and means for withdrawing greases and oils from the surface of the liquid.

4. In a grease interceptor, a chambered body having an inlet onone side adjacent the bottom and an outlet on the opposite side adjacent, the bottom, a member mounted within the body adjacent the inlet and spaced from 'the bottom thereof, said member having a recess in its face opposite the inlet into which the liquid discharges from the inlet, said recess having an upwardly extending wall inclinedvto the vertical toward the inlet wall providing a means for defiecting the inflowing liquid upwardly and toward the inlet wall before it passes between the member and the said inlet wall to the outlet thereby providing a time interval for material of less specific v gravity than water to rise to the surface of the liquid in the body, said outlet being constructed to maintain a minimum level of liquid in the body, a skimmer formed integrally with the outlet member and providing a horizontal edge portion extending transversely of the body and positioned below the liquid level Within the body, said skimmer having a chamber on each side of the body for receiving grease passing over the skimmer edge, and means associated with each chamber through which greases may be withdrawn therefrom.

5. In a grease interceptor,a'chambered' body having a cover and further having an inlet thereto through one wall and an outlet, therefrom, a partition in the chamber of said body having its having lan inletv thereto through one wall and any outlet therefrom, a partition in the chamber. of `said rbody having a portion of its faceopposite to the inlet and a bottom portion located below the inlet and spaced from the inlet wall .and from the chamber bottom, that portion ofthe partition which is opposite the inlet being adapted to receive the impact of liquid discharged into the Chamber and being shaped to deiiectthe liquid on the inlet side of the partition and thereby l.promote yand assist in rise of the lighter oils and grease and downward Vflow of the heaviery water beneath the partition toward the outlet, theupper portion of said partition being spaced further` than its bottom portion from theinlet Wall and being provided with a narrow vertically extending slot whose lower end liesabove the minimum liquid level in said chamber and throughy which oil and grease pass when the liquid level rises on the inlet side of the partition.

7. In a greaseinterceptor, a chambered body having an inlet and an outlet and a' cover, a partition adjacent the inlet the upper edge of which is spaced from the cover and having a deflecting vportion -of Vits face opposite lthe inlet and a bottom portion extending .to close spaced relation with and below the inlet and spaced from the bottom of the body, said partition extending upwardly to above the liquid level and being provided with a vertical slot open through the upper edge thereof, v'said deecting portion receiving liquid discharged into the body and having a form to deeet liquid upwardly substantially as described to deflect the same upwardly between the partition and the wall on the inlet side of the body by force of inflow, whereby the lighter oils and greases may have opportunity to rise to the surface and the liquid and water thus freed of matter having less specic gravity may pass beneath the partition to the outlet. i Y y 8. In a grease interceptor, a chambered body having an inlet and an outlet, a partitionmember within the body having a bottom portion adjacent the inlet and spaced from the inlet wall and from the bottom wall of the body and an upper portion spaced a greater distance from the inlet wall than the said bottom portion and a curved portion providing oil 'deiiecting means' lying opposite the inlet and connecting the said upper and lower portions of the partition, whereby liquid flowing into the body through the inlet engages the oil deflecting means and is deflected upwardly before passing beneath the partition,

thereby providing a time interval permitting oils, greases and so forth, to pass to the top of the liquid in the body, the upperv edge of the partition member having a slot above the normall liquid level and through which the greases may pass on rise of the liquid level by inflowing liquid,

said body having a cover in sealed relation therewith preventing escape of gases from the top of the body chamber, and liquid sealing means opening both to the body chamber and to the outlet.

9. In a grease interceptor, a chambered body having an inlet and an outlet, a partition member within the body having a bottom portion adjacent the inlet and spaced from the inlet wall and from the bottom wall of the body and an upper portion spaced a greater distance from the inlet wall than the said bottom portionand a curved portion providing oil deiiecting means lying opposite the inlet and connecting the said upper and lower portions of the partition, whereby liquid flowing into the body through the inlet engages the oil deecting means and is deflected upwardly before passing beneath the partition, thereby providing a time interval permitting oils, greases and so forth, to pass to the top of the liquid in the body, the upper edge of the partition member having a slot above the normal liquid level and through which the greases may pass on rise of the liquid level by inflowing liquid, said body having a cover in sealed relation therewith preventing escape of gases from the top of the body chamber, liquid sealing means opening both to the body chamber andvto the outlet, and beans for withdrawing greases and oils from the surface of the liquid. V

l0. vIn a grease interceptor, a chambered body having an inlet on one side thereof adjacent the bottom and an outlet manifold exteriorly of the body on another side thereof and adapted at its upper end for connection with an outlet conduit and at its lower end opening to the bottom of the chambered body, said outlet manifold determining the normal liquid-level in the body, means f or venting the gas and air space in the body to the outlet manifold comprising a U shaped trap having one leg interiorly of the body and open at its top to the air and gas space of the body and the other leg exteriorly of the body and connected to the outlet manifold and opening thereto below the normal liquid level in the body, and an oil skimmer mounted on the said vent means within the body and having a closable opening for removal of greases and oils from the surface of liquid in the interceptor body to the exterior thereof, the whole providing a structure whereby accumulation of gases above the liquid level -in the body under certain pressure forces the liquid from the trapA thereby permitting the gases accumulated in the body above the liquid level to pass to the outlet manifold and thence to the outlet conduit.

11. In a grease interceptor, a chambered body having an inlet on one side thereof adjacent the bottom and an outlet manifold exteriorly of the body on another side thereof and adapted at its upper end for connection with an outlet conduit and at its lower end opening to the bottom of the chambered body, said outlet manifold determining the normal liquid level in the body, means for venting the gas and air space in the body to the outlet manifold compriisng a U shaped trap having one leg interiorly of the body and open at its top to the air and gas space of the body and the other leg exterorly of the body and connected to the outlet manifold and opening thereto below the normal liquid level in the body, and an oil skimmer mounted on the said vent means within the body and having a closable opening for removal of greases and oils from the surface of liquid in the interceptor body to the exterior thereof, the whole providing a structure whereby accumulation of gases above the liquid level in the body under certain pressure forces the liquid from the trap thereby permitting the gases accumulated in the body above the liquid level to pass tothe outlet manifold and thence to the outlet conduit.

EDWARD W. N. BOOSEY.`

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