Improved Suction Strainer With Detachable Magnets

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.