|Title of Invention||
PRE FILTER WATER SEPERATION
|Abstract||The invention relates to a integrated prefilter trater seperator for Use with diesel fuel section pump wherein the assembly include the replaceable filter assembly to filter the dirt from the fuel and a water separated to separate the water on the principle of spin-on mechanism. The water separator element comprising of a sheet metal plate is welded to a metal which is further welded to top of the housing at the bottom the second filter assembly is position. As per the invention both the filter assemblies are position filled with a single housing, one below the other, enabling the inlet fuel to be filtered for dirt and water within a single housmg. The mvention further incorporates the replacement of filter element. ABSTRACT The invention relates to a integrated prefilter water separator for use with diesel fuel injection pump wherein the assembly includes the replaceable filter assembly to filter the dirt from the fuel and a water separated to separate the water on the principle of apin-on mechanism. The water separator element comprising of a sheet metal plate is welded to a metal funnel which is further welded to top of the housing at the bottom the second filter assembly is position. As per the invention both the filter assemblies are positioned within a single housing, one below the other, enabling the inlet fuel to be filtered for dirt and water within a single housing. The invention further incorporates the replacement of filter element.|
PRIOR ART !-
Independent prefilter alongwhith independent water separator 13 uaed in diesel fuel injection pumps, which filter the fuel for dirt and remove the water respectively. As per the invention, it is desired both the acts are combined in a single integral filter unit, such that the water separator funnel and the filter element axe filtered in a single housing.
Generally in a diesel engine the function of the components of fuel injection system heavily depends on the quality of the luel flowing through the components. It is always preferable and recommended that the fuel be free of water components and dust free to avoid ineffcient combustion, poor startup and to increase the life of the components. The fuel delivered from the fuel supplied pump is past through the fuel filter system which has a water filtration unit and also a separate dust removal filter. The impuirity collected therein is disposed off and the clean fuel is moving on. The prior art does not allow the removal of filter element very easily when there is a need to replace the element due to the accumulation of dust on the filter element. The prior art has two basic disadvantage which is in the sense having two separate filter division and further filter element not been easily replaceable.
The known fuel filter has a cylindrical outer container in which «li annular or cylindrical filter element is disposed coaxially. The unfiltered fuel enters the top portion of the container through an upper plate having a
number of holes. The fuel then flows radially inward through the filter element to the middle of the filter where there is a threaded filter outlet concentric with the longltudinal axis of the filter.
Alternatively the filter inlet and outlet may be reversed such that the flow is radially outward through the filter element which however is beyond the scope of this invention. Pew examples are given below:-
In either event, water droplets fall to the bottom of the filter container where they are collected in a bowl removably connected there to by threads.
There have been several different technologies for mounting the filter element inside the filter. In all cases, however it is necessary to seal the filter element to the upper plate through which the fuel enters, in order to isolate the inlet and outlet flow paths.
Example 1 :- Compression spring disposed between bottom of filter element and base of outer container.
Example 2 :- Plastic annular threaded ring is provided in a bottom portion of the outer housing. Ring spaces the filter element from the bottom of the housing, has threads for attaching the collection bowl to the filter and may also direct contaminant flow into the collection bowl.
OBJECT OF THE INVENTION :-
Due to heavy contamination of the fuel made available in the market for automobiles there is an urgent need for a fuel filter system which is easy to construct, which is adaptable and in which the filter element is easily replaceable as frequently as decide by the user. There is a need for replaceable fuel filter assembly that is less expensive and easier to manufacture.
The object of the invention is to mount the fitment of water separator funnel and the filter element assembly in a single housing and such that integral assembly is attachable to the filter cover and is of replaceable type.
This invention relates generally to a replaceable filter assembly for a spin-on coalescing filter in which the filter element is suspended at a clearable firom the bottom of the housing, The typical spin-on fuel filter utilizes the centripetal forces of fluids to separate water from fuel oil;
An integral replace fuel filter assembly which is the Prefilter Cum Water Separator Assembly for Diesel fuel comprises of replaceable Exchange Fllter' lnsert Assembly for a spin-on coalescing filter within a sealed metal housing having a top cover plate assembly a bottom drain assembly and central two filtration assemblies and capable of being threaded onto filter cover assembly
via bushing threads, which bushing is part of filter cover assembly, so as to form a adngie integral Prefilter Cum Water Separator.
An integral replace fuel filter assembly which Prefilter Cum Water Separator Assembly for Diesel fuel comprising of replaceable Exchange Filter Insert Assembly for a spin-on coalescing filter enclosed in a totally sealed metal housing, screwed at the top end onto a filter cover assembly tluougji a threaded bushing provided on the filter cover assembly and at its bottom end having a drain pipe to drain off water.
DSSCRgTIOir OF THE HrVEWTIOlf :-
The integral replaceable filter assembly has a housing, which has a cover plate assembly crimped at the top with a hole at the top of the housing which communicate with the interior portion of the housing and has threads for replaceably mounting witli cover plate assembly. A Separation plate which is a perforated sheet metal plate, is welded onto a sheet metal funnel wliich in tvirn is welded into top cover plate Assembly. The sheet metal funnel is a water separator assembly. Further a filter element is mounted within the same housing including a top end cap and bottom end cap fixedly attached to a central filter medium which is a paper filter element. An inner fi.iel chamber is disposed inside the filter element while the outer fuel chamber is disposed between the filter element and the metal housing.
A mounting assembly is attached between the top portion of the housing and top end cap, thereby suspending the filter element from the perforated Metal plate at a clearance from the bottom of the housing. Such that the suspension assembly also seals the hole and inlet fuel chamber from the outlet fuel chamber.
A rubber sealing is disposed between the top end cap of filter element and the furm.el to ensure total sealing between filtered and unfiltered fuel.
Aa per the invention the contaminated fuel enters through the inlet and falls on the grooved perforated sheet metal funnel water particles being heavier than those of fuel retain the direction of flow longer, get separated from fuel and collect at the bottom of the housing to be drained off. The cone like structure of the funnel and the helical grooves increase the water separation efficiency. Thereafter fuel passes through the filter element for dirt separation. The entire assembly is spin-on type.
Further as per iovention filter unit is attachable to the filter cover througih a bushing. the bushing is a part of the filter cover assembly and the threads on the iimer side of the hole of the cover plate Assembly is screwed onto the bushing of filter cover assembly, thus achieving attachable and replaceable type filter.
The components comprising an invention is given below :-
• Filter Assembly and
• Filter Cover Assembly
A prefilter Cum Water Separator for Diesel Fuel comprising of Replaceable Exchange Filter and Insert Assembly for a spin-on coalescing filter such that the said Replaceable Exchange Filter and Insert assembly can be threaded onto filter cover Aasembly via a buah which ia part of aaid filter cover assembly so as to form a single integral Prefilter Cum Water Separator wherein Replaceable Exchange Filter and Insert Assembly further includes :-
a. A Sheet Metal housing;
b. A hole in the top portion of the said housing, for communicating
with the interior portion of the houaing. Threading on inner surface
of said hole for replaceable mounting onto bush of the iilter cover
c. A cover plate assembly crimped at the top of the said sheet mietal
d. A drain plug with a drain pipe at the bottom of the hoiising to
drain ofi" water wliich is collected in the bowl;
e. A sheet metal fiinnel having helical groove and inner side welded to
the said cover plate assembly;
f. A perforated sheet metal plate welded onto the said metal funnel;
g. A filter element mounted within the said housing and below the aaid funnel including a top end cap, a filter medium and a bottom end cap. Said filter medium is fixedly attached to aaid upper and lower end caps;
h. A suspension assembly fixedly attached between the top portion of the said housing and the said top end cap of said filter element, thereby suspending the said filter element from the perforated plate at a clearance from the bottom of housing and also acts as a separator between the hole and inlet fuel chamber from the outlet fuel cham.ber; and
i. An inlet fuel chamber disposed between said filter element and communicating with said inlet hole.
j. An outlet fuel chamber disposed between outer periphery of said filter elem.ent and said metal housing; and
k. Rubber sealing between said filter element and said funnel to seal between said inlet fuel chamber and said outlet fuel chamber such that the contaminated fuel enters through the said hole, falls onto the said perforated sheet metal plate, further falls onto the said funnel, and due to centripetal force, the heavy water is separated onto the bottom of the housing and drained off, the fuel moves through the filter element and outward through the outlet chamber.
The said Filter Cover Assembly is a Aluminium casting includes M14, fuel inlet and outlet banjo connections alongwith a threaded bushing, which is adaptable to threaded onto the said threading provided on the inner side of the said hole of the top portion of the housing of filter Assembly;
Typically a fuel filter is for separating the contaminants like dirt and
water. Typically unfiltered fuel enters from top portion of a container through
inlet holes disposed in upper plate around the periphery of central opening.
These holes may be in fluid communication with either inner or outer fuel
chamber. Typically contaminated fuel enters through inlet holes
communicating with inlet chamber, then fuel flows radially inward/outward through the filter element to the outer chamber duly filtered, which further is conducted through outlet opening to the engine. The inlet and out chamber are cylindrical, concentric chambers, one being inner chamber and other being outer chamber. Due to Spin-on action of the unit, the heavier water drops down to bottom of the chamber through which the contaminated fuel enters and the dirt is trapped by the filter medium.
DESCRIPTION OF DRAWINGS :-
Now the invention is described with reference to the drawings annexed with :-
Fig. 1 gives a cross sectional view of the Integral Filter Assembly as per the invention. The cross sectional view and filter cover assembly. The filter
assembly includes replaceable exchange filter and insert assembly which are threaded on to filter cover assembly. The entire assembly is included inside the metal sheet housing which has a top portion of the said housing for communicating with the interior portion of the housing threaded on to the inner surface of the said hole made on the top portion, the iilter cover assembly is fitted on to. The filter cover assembly essentially includes a fuel inlet and outlet connection. The cover plate of the filter cover assembly (1) is crimped to the said sheet metal housing. A sheet metal grooved funnel marked (4) is welded to the cover plate assembly (1). A perforated sheet (2) is welded on to the said metal funnel. The perforated plate is welded alongwith a sealing rubber (3) acting as a sealen. A Filter element comprising a top end cap (5), bottom end cap (7) along with a paper filter medium (6) is also illustrated in the drawing. A suspension assembly fixedly attached between the top portion of the said housing and said top end cap of the filter element suspense the said filter element from the perforated claims at a clearance from the bottom of the housing and further acts as a separator between the inlet fuel chamber and outlet fuel chamber. Fig. 3 gives a top view
Fig. 3 gives a cross sectional view of filter assembly having only a water
Pig. 4 gives a cross sectional view of filter assembly.
Fig. 5 gives a cross sectional view showing the funnel and filter element.
WE CLAIM :-
1. An integral replaceable fuel filter aaserably which is a prefilter cum watei separator used for diesel fuel comprising/:-
a filter cover assembly of aluminium casting including a fuel inlet, fuel outlet of M14 and with a threaded bushing^'
a Sheet Metal Filter housing with a spin-on mechanism and totally sealed having a top cover plate assembly and bottom cover plate assembly, said top cover plate assembly crimped at the top, said top cover plate assembly having inlet port and oiitlet. pqi*t» communicating with inlet and outlet port of said filter cover respectively, wherein said outlet port is threaded onto bushing of said filtiCi* covei* for replaceably mounting and said bottom plate including a ; drain plug to drain out water collected;)
a tenter separator assembly including a sheet metal perforated *^
separation plate, and sheet metal funnel, wherein inner end periphery of said
separation plate is vi^elded onto top end of said funnel and top end of said
funnel is welded onto said cover plate assembly, wherein the top end of the t
said funnel is welded at a point on said cover plate assembly radially spaced
apart fi:om the inlet port and outlet port but between the inlet port and outlet
port, said funnel is defibiied by increasing diameter firom top to bottom; said '
separation plate is radially outward from the said fixnnel; i ^>
a Paper filter element disposed below said water separator assembly including top eiad cap, a bottom end cap and filter me
an inner fuel outlet chamber disposed inside said paper filter element and communicating with said outlet port';.
an Outer fnel Inlet ohamber disposed between the outer periphery of
filter element and said filter housingj,
a Mounting Assembly includes upper vertical annular- cylindrical
portion and a lower horizontal circular plate portion, said horizontal circular
plate is radially - outward in relation to vertical annular portion, The said
mounting assembly/is a L' shaped assembly when viewed in cross sectional
having a vertical member fixedly attached to the said top cover plate Assembly
of said filter housing and a horizontal member fixedly attached to said top end
cap of said filter element, wherein said vertical member is radially positioned to
be apart from the inlet port and outlet port but between inlet port and outlet 1
port of the cover plate assembly, wherein said vertical mumbeT extends along
the length of the said funnel, wherein the horizontal member extends along the/
top end cap of filter element, wherein said horizontal member is defined by
central recess portion, first and second ends, both ends having lip projections,
which positively engage the inner periphery andl oxiter periphery of said top end
cap of the said filter element, respectively and the central recess portion
becoming a snap fit when the top end cap is press fit into the said horizontal
member, wherein vertical member and hoiiEontal member of said mounting I
assembly are fixedly attached to said cover plate assembly and top end cap of
'■ filter element respectively, for suspending the said filter element firom the top of
/ the housing, disposed below the said water separator assembly and at d
desired clearance firom the bottom cover plate assembly of said housing;
a sealing; rubber assembly disposed between the top end cap of the filter element and said fiinnel, and in contact along the vertical member and horizontal member of said mounting assembly, so as to seal the said inlet port and said outer fuel inlet chamber firom the said inner fuel outlet chamber.
2. An integral replaceable fuel assembly as claimed in claim 1, wherein said water separator assembly and said paper filter element assembly are disposed within the said filter housing.
3. An integral replaceable fuel assembly as claimed in claim 1, wherein said water separator assembly is disposed above the said paper filter element assembly within the said filter housing,
4. An integral replaceable fuel assembly as claimed in claim 1, wherein said water separator aaaembly is fixedly attached to said honsing by weldling.
5. An integral replaceable fuel assembly as claimed in claim 1 wherein said filter element ia held by the mounting aaaembly» and tlesm-etl dearance given between lower end cap and the bottom cover plate assembly.
6. An integral replaceable fuel assembly as claimed in claim 1, wherein said mounting assembly seals the outer inlet chamber and inner outlet chamber from each other.
7. An integral replaceable fuel assembly as claimed in claim 1, wherein the mounting assembly is annular in shape for vertical member and flat circular plate shape for horizontal member, with lip projections at all ends, and wherein annular -wertical member surrounds said outlet port cylindrically.
8. An integral replaceable fuel assembly as claimed in claim 1, wherein said vertical member is disposed between the fuel outlet port and the said funnel, with its upper end fixed onto said cover plate assembly and lower end fixed onto the top end cap of filter element.
9. An integral replaceable fuel assembly as claimed in claim 1, wherein in Mounting Assembly is made of metal.
10. An integral replaceable fuel assembly as claimed in claim 1, wherein said outlet port of the top cover plate assembly includes a thread mating with the threaded bushing of filter cover, thereby forming a replaceable filter assembly.
11. An integral replaceable fuel,assembly as claimed in claim 1, wherein said funnel has helical grooves on its surface.
12. A method of making an integral filter assembly having a metal housing, with a top cover plate assembly having inlet and oxitlet ports, a water separator assembly mounted within the housing and fixedly attached to top cover plate assembly, further below a filter element assem.bly suspended from. the top cover plate assembly by means of mounting assembly, such that mounting assembly further partitions the inlet outer chamber and inner outlet chamber, threading on the outlet port mating with the threaded bushing of the filter for replaceable fitting with filter cover and a bottom plate cover of the said housing with drain plug to drain off the water.
13. An integral replaceable fuel assembly as claimed in claim 1, which is a spin-on fuel filter type, utilizing the centripetal force of the fluids to separate water from fuel oil.
14. An integral replaceable fuel assembly as claimed in claim 1, wherein the bottom end cap of the said filter element is secured at the bottom portion of the said filter housing by means of six projections on the bottom plate which holds the filter element in the housing.
15. An integral replaceable fuel assembly as claimed in claim I, wherein the bottom portion of said filter housing defines a water collection area at the
bottom alongwith drain means for removing collected water from said water collection area.
15. An integral replaceable fuel assembly as claimed in claim 1, wherein the water separator element is in top and dirt filter element is at bottom both elements detachably mounted within a single housing.
! 17. An integral replaceable fuel assembly, as substantially illustrated in the accompanying drawings.
/ 18. An integral replaceable fiiel assembly, as substantially illustrated in the
/ I accompanying Complete Specification.
i ' •
|Indian Patent Application Number||288/CHE/2003|
|PG Journal Number||08/2007|
|Date of Filing||03-Apr-2003|
|Name of Patentee||M/S. MOTOR INDUSTRIES COMPANY LIMITED|
|Applicant Address||HOSUR ROAD,ADUGODI BANGALORE|
|PCT International Classification Number||F02B77/00|
|PCT International Application Number||N/A|
|PCT International Filing date|