Object of the Invention
The present invention relates to improved suction strainer with detachable
magnets the hydraulic fluid filtration system.
And more particularly the present invention relates to improved suction
strainer with detachable magnets to capture and retain the ferrous dirt
contamination in the machinery used in the construction industry as well as in
the other industrial applications.
Prior Art
Generally the construction equipment machines which are having the
hydraulic filtration system suffers inherently from the ferrous dirt contamination
resulting from the debris, burrs, welds and other such external or internal
factors. The oil inside the hydraulic tank which is contaminated by ferrous dust
particles of very small size varying up to micron levels remains unfiltered in the
previous stage of filtering by the coarse mesh media. This unfiltered ferrous dirt
severely effects the functioning of the hydraulic components includes pumps,
hydraulic cylinder etc.
Hence the filtration capturing, and subsequent removal of these ferrous
dirt particles is essential for smooth functioning and better life of the hydraulic
filtration system.
US Patent No. 4067810 relates to a magnetic filter element comprises a
rubber bonded barium ferrite permanent magnet strip enclosed in a thin, liquid

a .fluid system to capture magnetically attractable contaminants. The disclosure
illustrates various arrangements of the magnet with filter cartridges as well as
the construction of the magnet element itself.
US Patent No. 4663034 is in respect of Hydraulic filter system for
excavation equipment. This Patent generally pertains to a magnetic filter
module and system embodying the same for removing magnetic materials from
lubricating oils used in hydraulic systems such as supplying oil to hydraulic
excavators. The filter module includes one or more filter elements each having
an elongate cartridge, a plurality of permanent magnets disposed about the
cartridge and a plurality of non-magnetic spacers disposed about the cartridge
between the permanent magnets.
Yet another related document is US Patent No. 6270667 relating to Oil
filter not using filter paper but using permanent magnets. An oil filter, not using
a filter paper element, and not having a strainer component, including an array
of relatively large permanent magnets, either disc-shaped or stick-shaped. The
array is dimensioned to occupy an area which is substantially equal to an area
within a case for said array of permanent magnets, such that the array
substantially fills the entire area of the case element. The individual permanent
magnets within the array are separated equidistantly from one another by non-
magnetic separating elements and the equidistant separation interval is less than

half of an interval that the individual permanent magnets would naturally repel
one another as a result of the magnets being positioned in opposing polar
relationship. The relatively large dimension of the individual permanent
magnets within the case element allows the filter to remove metallic micro
particles more efficiently than in the past.
Reference is made of US Patent No. 6576128 in respect of Magnet
assembly for removing ferrous metal particles from fluids wherein a magnet
assembly includes a ring shaped magnet having a face with an inner surface that
is removably attachable to a ferrous metal housing of a fluid filter. The face has
a plurality of circumferentially spaced pairs of poles that concentrate the
magnetic strength of the magnet on the face and form magnetic loops in the
filter housing to cause any ferrous metal particles in the fluid being circulated
through the filter housing to be trapped against interior walls of the filter
housing.
In Patent application No. 09/888,103 for Combined oil filter and magnet
apparatus which comprises of an oil filter and a removable and reusable magnet
unit attached to the oil filter. The removable and reusable magnet unit attracts
and retains ferro-magnetic particles present in the oil flowing inside the oil
filter, thereby separating those particles from the flowing oil. Inside the oil
filter, an oil flow director is provided to direct oil flow to the vicinity of the
removable and reusable magnet unit. With a first embodiment of the invention,

the removable and reusable magnet unit is partially received in a centrally
located filtered oil flow space inside the oil filter. With a second embodiment of
the invention, the removable and reusable magnet unit is completely external to
the interior of the oil filter
The principal object of the present invention is to provide an improved
suction strainer by placing detachable magnets into the housing of the suction
strainer. The detachable magnets filter out the ferrous dirt particles from the oil
going to pump in the hydraulic tank. The detachable magnets provides ease of
servicing and more particularly to remove ferrous dirt from the magnet
henceforth the system can be reused again once cleansing operation of the
ferrous dirt on the magnets is done.
Advantages over prior art
The advantages inter alia include :-
(i) instant invention enhances the performance of the suction strainer and hence
improving the life of hydraulic component. Moreover, unique pocket concept
helps in retaining large quantity of particles also.
Summary of the invention
According to the present invention there is provided improved suction
strainer with detachable magnets the hydraulic fluid filtration system
comprising the filter body (101) and the pocket (102) or housing to embed the
magnetic bar inside it, and the instant system comprising three of such magnetic

housings, the magnet bar (103) is inserted in the housing (102); these magnet
bars are detachable to the housing (102), the member (104) the magnet rests in
the slots that are provided in the housing in such a way that oil going to the
hydraulic pump through the improved suction strainer passes over at least one
face of the magnet.
Any ferrous particle passing over the removable magnet (103) through
strainer section gets trapped by the magnet.
The face of the magnet rests lower than the inner face of the filter body
resulting in formation of a pocket (102) to entrap the ferrous dirt.
The filtering process continues more and more particles gets entrapped
over the magnet and the detachable magnet bars can be removed from the
housing for cleansing operation of the magnetic bar, once the dirt is removed
from the bar it is again kept inside the housing for filtering operation.
The advantages and novel features of the invention will become more
apparent from the following detailed description when taken in conjugation with
accompanying drawing and this drawing is illustrative in explaining the
constructional details of the device of the invention.
Brief description of the accompanying drawings:

We shall now describe the present invention with reference to
accompanying drawings which are given by way of illustration but does not
restrict the scope of invention.
Fig 1 shows the Sectional view of the Suction Strainer.
Fig.2 shows the Sectional view of the Housing.
Detailed description of accompanying drawings:
Figure 1 illustrates the section of the strainer, (101) is the filter body and
(102) is the pocket or housing to embed the magnetic bar inside it. The instant
system comprising three of such magnetic housings however any plural number
of such slots can be designed looking at the spirit of the invention. The magnet
bar (103) is inserted in the housing (102) as shown in figure 1. These magnet
bars are detachable to the housing (102). The member (104) is a known mesh
element. The magnet rests in the slots that are provided in the housing in such a
way that oil going to the hydraulic pump through the improved suction strainer
passes over at least one face of the magnet. The sectional view of the housing is
shown in the Figure 2 for further clarity of the proposed design.
Any ferrous particle passing over the removable magnet (103) through
strainer section gets trapped by the magnet. The face of the magnet rests lower
than the inner face of the filter body as shown in the Figure 2 resulting in
formation of a pocket (102) to entrap the ferrous dirt. As the filtering process
continues more and more particles gets entrapped over the magnet. The

detachable magnet bars can be removed from the housing for cleansing
operation of the magnetic bar, once the dirt is removed from the bar it is again
kept inside the housing for filtering operation. In this way the ferrous dirt
particles attached to the magnetic bar are removed periodically and henceforth
the system design gives the advantage of reusability of the filtering section
improved life of hydraulic fluid and components of the hydraulic filtration
system.
While the invention has been illustrated and described in detail in the
drawing in the above description, the same is to be considered as illustrative and
not restrictive in character, it is understood that, given the above description of
the embodiments of the invention, various modifications may be made by one
skilled in the art.
Although this invention has been described in its preferred form with a
degree of particularity, it is understood that the present disclosure of the
preferred form has been made only by way of explanation and that numerous
changes in the details of construction and the combination and arrangements of
parts may be resorted to without departing from the scope of the invention.