Title of Invention	NON CONTACT TYPE LIQUID FILTRATION SYSTEM
Abstract	This invention relates to non contact type liquid filtration system comprising of a vacuum pump mounted on a liquid tank and is driven by electrical motor, a suction inlet chamber for said vacuum pump mounted on top surface of the liquid tank, said tank is totally sealed and leak proof, filter elements kept inside the above said sealed tank, delivery pump, suction strainer for delivery pump, suction inlet pipe and return out let pipe, motors coupled to above mentioned pumps through a power transmission system. Once vacuum pump is started, vacuum pump sucks air from filtration system tank /chamber, filters bags, suction inlet pipe and delivers the sucked air to atmosphere through exhaust outlet continuously and because of which a pressure difference is created and fluid under filtration is sucked positively into filtration chamber through filter. Filtered liquid is stored in filtration system tank and tank under filtration is cleaned totally if required to remove the residual settled at bottom the of tank .After cleaning of the tank filtered liquid is returned back to source tank with the help of delivery pump and in line optional filter.

Title of Invention

NON CONTACT TYPE LIQUID FILTRATION SYSTEM

Abstract

This invention relates to non contact type liquid filtration system comprising of a vacuum pump mounted on a liquid tank and is driven by electrical motor, a suction inlet chamber for said vacuum pump mounted on top surface of the liquid tank, said tank is totally sealed and leak proof, filter elements kept inside the above said sealed tank, delivery pump, suction strainer for delivery pump, suction inlet pipe and return out let pipe, motors coupled to above mentioned pumps through a power transmission system. Once vacuum pump is started, vacuum pump sucks air from filtration system tank /chamber, filters bags, suction inlet pipe and delivers the sucked air to atmosphere through exhaust outlet continuously and because of which a pressure difference is created and fluid under filtration is sucked positively into filtration chamber through filter. Filtered liquid is stored in filtration system tank and tank under filtration is cleaned totally if required to remove the residual settled at bottom the of tank .After cleaning of the tank filtered liquid is returned back to source tank with the help of delivery pump and in line optional filter.

Full Text	FORM 2 THE PATENTS ACT 1970 (39 of 1970) & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION (See Section 10; rule 13) TITLE OF THE INVENTION Non Contact Type Liquid Filtration System APPLICANTS TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India INVENTOR Mr. Vivek Vishwanath Joshi an Indian national of TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India PREAMBLE TO THE DESCRIPTION The following Complete specification particularly describes the invention and the manner in which it is to be performed. FIELD OF INVENTION This invention relates to a liquid filtration system and more particularly to a non-contact type liquid filtration system using vacuum as a medium. BACK GROUND OF INVENTION Liquid filtration systems are known in industries where liquids are used for cooling and/or lubrication purposes in machining operations, and the like. The contaminated liquid is conducted from the area of the operation wherein it is utilized in filtration apparatus for removal of the solid foreign matter and the clean liquid is returned for further use. Prior patents US 4, 448, 683; US 4, 137, 169; US 4,458,059; US 5,387,339 are examples of such liquid filtration system used in industries. Figure 1 shows a conventional filtration system used for filtration of liquids such as hydraulic oil, lubrication or cutting oil etc. The system consists of a suction pump (a), filter unit (b) working on either mechanical or electrical principle , filtration housing (c), suction pipe (d) and delivery pipe (e). Contaminated liquid such as hydraulic oil, lubrication or cutting oil etc. is sucked through the inlet of the pump (a), and is allowed to enter into the pump chamber and progressively is pushed further to the outlet of the pump and onto the filtration cartridge and the filtered liquid is returned back to the source tank. The drawbacks with the above system are as mentioned below. 1. Contaminant particles present in the liquid damage the pump, since the pump continuously comes in contact with contaminated liquid. 2 2. More time is required to filter the required quantity of liquid. 3. There is no provision to clean the tank at the time of filtration. 4. There is no provision to select the different size filters during the filtration process. The proposed filtration system is designed to overcome the above said drawbacks. BRIEF DESCRIPTION OF INVENTION The non contact type liquid filtration system according to this invention comprises a vacuum pump fixed on a liquid tank and being driven by an electrical motor. A suction inlet chamber for said vacuum pump is mounted on top surface of the liquid tank, said tank being totally sealed and leak proof. A plurality of filter elements are kept inside the said sealed tank. Delivery pump, suction strainer for delivery pump, suction inlet pipe, return out let pipe and motors are coupled to the above-mentioned pumps through a power transmission system. When the vacuum pump is started, air is sucked from the filtration system tank / chamber, the filter bags and the suction inlet pipe and is delivered to the atmosphere through exhaust outlet continuously. Due to this operation a pressure difference is created and fluid under filtration is sucked positively into filtration chamber through the plurality of filters. The filtered liquid is stored in the filtration system tank and the tank in which the filtered liquid is stored is cleaned totally if required to remove the residual settled at bottom of the tank. After cleaning of the tank filtered liquid is returned back to source tank with the help of delivery pump and in line optional filter. 3 OBJECTS OF INVENTION The main object of this invention is to provide a non-contact type liquid filtration system using vacuum as a media. Another object of this invention is to provide a non-contact type liquid filtration system having simple in construction, reliable, quick and most economical. Yet another object of this invention is to provide a non-contact type liquid filtration system to handle large quantity of liquid in a minimum given time. Yet another object of this invention is to provide a non-contact type liquid filtration system having different grade filters accommodated in a single unit. BRIEF DESCRIPTION OF THE DRAWINGS Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same. Fig. 1 shows a conventional liquid filtration system. Fig.2 shows a layout of non contact type liquid filtration system in accordance with this invention. Fig.3 shows an exploded view of a non contact type liquid filtration system. Figs.4 & 5 show actual photograph of filtration system in accordance with this invention. DETAILED DESCRIPTION OF THE INVENTION 4 The embodiments of the invention will be described with reference to Figs. 2 and 3 A vacuum suction pump (1) is interconnectedly mounted on a liquid tank (11) with the help of suction pipe (2) and suction chamber (3) and is driven by a motor (8) through a power transmission system (9). Filter bags (12,13,14) of similar or different desired grade size are fitted inside the said tank (11) in a sealed manner with the help of flange and fasteners or quick couplings and a wire mesh structure is kept inside the filter bag to prevent collapsing of said bag under vacuum. The said filters are connected to a common pipe (15) through valves (21). A vacuum gauge (16) is mounted on a common pipe (15) to monitor the vacuum inside the tank. The said common pipe (15) is in turn conncted to a liquid tank, (22) which contains the liquid to be filtered, through a suitable pipe. Liquid tank (11) and liquid tank having the liquid to be filtered (22) are interconnected by a suitable pipe. Optionally a micro filter (17) is connected to the return line (18) of the delivery pump (6) to facilitate further filtration of liquid. The delivery pump (6) is connected to a suction strainer (10) through suction pipe (7) to protect said delivery pump (6) from damage and is also connected to the liquid tank having the liquid to be filtered (22) through a suitable pipe and non return valve. The said tank (11) is totally sealed and is air tight / leak proof and is mounted on wheels. During off position the said filters (12, 13, and 14) are kept in closed position and the number of said filter bags may vary from 2 to 6 depending on the size of liquid tank. When motor (8) is started, vacuum pump (1) starts and sucks the air from the tank (11), filters (12, 13 & 14) and delivers it out through its exhaust (4). Instantly, vacuum is generated in the tank (11). When inlet valves (21) of one of the said filter is opened, liquid from tank (22) is sucked immediately. This creates a pressure 5 difference between tank (11) and pipe. The liquid under filtration is then positively sucked into the common pipe (15) and through filter ( 12,13,14) the liquid flows to tank(ll). During this process contaminants are separated and caught into the filter bag. Filtered liquid is thereby collected into the tank (11). This filtered liquid can be stored into the tank (11) and the level of the filtered oil or fluid can be seen through a level indicator. If required the tank under filtration can be cleaned once it is emptied and residual settled at the bottom of tank can be removed. If required filtered liquid can be further refine filtered by at least one micro filter (17) connecting in a return liquid path of delivery pipe and retuned back the filtered liquid to liquid tank under filtration (22) through out let (18). The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof. 6 WE CLAIM 1. A non contact type liquid filtration system comprising: a vacuum suction pump interconnectively fixed on an air tight liquid tank through a suction pipe and suction chamber, said pump being driven by a motor through a power transmission system; at least one filtering means fitted inside the said tank in a sealed manner and connected to a common pipe through a regulating device, the said common pipe in turn being connected to a liquid tank under filtration through a suitable pipe; a delivery pump mounted on and connected to said liquid tank through a suitable pipe and a non return valve, to deliver filtered liquid back to liquid tank under filtration. 2. The system as claimed in claim 1 wherein the said delivery pump is connected to a liquid tank through a suction strainer to protect said delivery pump from damage. 3. The system as claimed in claims 1 and 2 wherein said filtering means are plurality of filter bags with similar or different grade filter units. 4. The system as claimed in claims 1 to 3 wherein at least one micro filter is connected in a return liquid path of said delivery pump to have further refined filtration of liquid. 5. The system as claimed in claim 1 wherein the said filtering means is fitted to said liquid tank with the help of flange and fasteners or flange and quick couplings. 7 6. The system as claimed in claims 1 to 5 wherein a wire mesh structure is kept inside the said filtering means to prevent collapsing of filtering means under vacuum. 7. The system as claimed in any one of the preceding claims wherein a vacuum gauge is mounted on the said common pipe to check the vacuum pressure inside the tank. 8. A method of filtering a liquid using the apparatus as claimed in claims 1 to 7 comprising the steps of: - starting the motor connected to the vacuum pump to enable suction of the air from the liquid tank; - delivering the air sucked from within the tank to the atmosphere outside thereby creating vacuum inside the tank; - opening the inlet valve of the filtering means to allow the liquid under filtration to pass into the common pipe by siphon effect due to the pressure difference between the tank and pipe; - filtering the sucked liquid through filtering means to separate the contaminated particles present in the liquid under filtration; - optionally further filtering the filtered liquid by atleast one micro filter; - collecting and storing the filtered liquid in the liquid tank. 9. The method as claimed in claim 8, wherein it comprises an optional step of cleaning the liquid tank under filtration once it is emptied and removing the residual settled at the bottom of said tank. 8 10 .A non contact type liquid filtration system and method substantially as herein described with reference to figs. 2 to 5 of the accompanying drawings. ABSTRACT Title: Non Contact Type Liquid Filteration System This invention relates to non contact type liquid filtration system comprising of a vacuum pump mounted on a liquid tank and is driven by electrical motor, a suction inlet chamber for said vacuum pump mounted on top surface of the liquid tank, said tank is totally sealed and leak proof, filter elements kept inside the above said sealed tank, delivery pump, suction strainer for delivery pump, suction inlet pipe and return out let pipe, motors coupled to above mentioned pumps through a power transmission system. Once vacuum pump is started, vacuum pump sucks air from filtration system tank /chamber, filters bags, suction inlet pipe and delivers the sucked air to atmosphere through exhaust outlet continuously and because of which a pressure difference is created and fluid under filtration is sucked positively into filtration chamber through filter. Filtered liquid is stored in filtration system tank and tank under filtration is cleaned totally if required to remove the residual settled at bottom the of tank .After cleaning of the tank filtered liquid is returned back to source tank with the help of delivery pump and in line optional filter. Fig.3

Full Text

FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
Non Contact Type Liquid Filtration System
APPLICANTS
TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India
INVENTOR
Mr. Vivek Vishwanath Joshi an Indian national of TATA MOTORS LIMITED, an Indian company having its registered office at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following Complete specification particularly describes the invention and the manner
in which it is to be performed.

FIELD OF INVENTION
This invention relates to a liquid filtration system and more particularly to a non-contact type liquid filtration system using vacuum as a medium.
BACK GROUND OF INVENTION
Liquid filtration systems are known in industries where liquids are used for cooling and/or lubrication purposes in machining operations, and the like. The contaminated liquid is conducted from the area of the operation wherein it is utilized in filtration apparatus for removal of the solid foreign matter and the clean liquid is returned for further use.
Prior patents US 4, 448, 683; US 4, 137, 169; US 4,458,059; US 5,387,339 are examples of such liquid filtration system used in industries.
Figure 1 shows a conventional filtration system used for filtration of liquids such as hydraulic oil, lubrication or cutting oil etc. The system consists of a suction pump (a), filter unit (b) working on either mechanical or electrical principle , filtration housing (c), suction pipe (d) and delivery pipe (e). Contaminated liquid such as hydraulic oil, lubrication or cutting oil etc. is sucked through the inlet of the pump (a), and is allowed to enter into the pump chamber and progressively is pushed further to the outlet of the pump and onto the filtration cartridge and the filtered liquid is returned back to the source tank.
The drawbacks with the above system are as mentioned below.
1. Contaminant particles present in the liquid damage the pump, since the pump
continuously comes in contact with contaminated liquid.
2

2. More time is required to filter the required quantity of liquid.
3. There is no provision to clean the tank at the time of filtration.
4. There is no provision to select the different size filters during the filtration
process.
The proposed filtration system is designed to overcome the above said drawbacks.
BRIEF DESCRIPTION OF INVENTION
The non contact type liquid filtration system according to this invention comprises a vacuum pump fixed on a liquid tank and being driven by an electrical motor. A suction inlet chamber for said vacuum pump is mounted on top surface of the liquid tank, said tank being totally sealed and leak proof. A plurality of filter elements are kept inside the said sealed tank. Delivery pump, suction strainer for delivery pump, suction inlet pipe, return out let pipe and motors are coupled to the above-mentioned pumps through a power transmission system.
When the vacuum pump is started, air is sucked from the filtration system tank / chamber, the filter bags and the suction inlet pipe and is delivered to the atmosphere through exhaust outlet continuously. Due to this operation a pressure difference is created and fluid under filtration is sucked positively into filtration chamber through the plurality of filters.
The filtered liquid is stored in the filtration system tank and the tank in which the filtered liquid is stored is cleaned totally if required to remove the residual settled at bottom of the tank. After cleaning of the tank filtered liquid is returned back to source tank with the help of delivery pump and in line optional filter.
3

OBJECTS OF INVENTION
The main object of this invention is to provide a non-contact type liquid filtration system using vacuum as a media.
Another object of this invention is to provide a non-contact type liquid filtration system having simple in construction, reliable, quick and most economical.
Yet another object of this invention is to provide a non-contact type liquid filtration system to handle large quantity of liquid in a minimum given time.
Yet another object of this invention is to provide a non-contact type liquid filtration system having different grade filters accommodated in a single unit.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same.
Fig. 1 shows a conventional liquid filtration system.
Fig.2 shows a layout of non contact type liquid filtration system in accordance with
this invention.
Fig.3 shows an exploded view of a non contact type liquid filtration system.
Figs.4 & 5 show actual photograph of filtration system in accordance with this
invention.
DETAILED DESCRIPTION OF THE INVENTION
4

The embodiments of the invention will be described with reference to Figs. 2 and 3 A vacuum suction pump (1) is interconnectedly mounted on a liquid tank (11) with the help of suction pipe (2) and suction chamber (3) and is driven by a motor (8) through a power transmission system (9). Filter bags (12,13,14) of similar or different desired grade size are fitted inside the said tank (11) in a sealed manner with the help of flange and fasteners or quick couplings and a wire mesh structure is kept inside the filter bag to prevent collapsing of said bag under vacuum. The said filters are connected to a common pipe (15) through valves (21). A vacuum gauge (16) is mounted on a common pipe (15) to monitor the vacuum inside the tank. The said common pipe (15) is in turn conncted to a liquid tank, (22) which contains the liquid to be filtered, through a suitable pipe. Liquid tank (11) and liquid tank having the liquid to be filtered (22) are interconnected by a suitable pipe.
Optionally a micro filter (17) is connected to the return line (18) of the delivery pump (6) to facilitate further filtration of liquid. The delivery pump (6) is connected to a suction strainer (10) through suction pipe (7) to protect said delivery pump (6) from damage and is also connected to the liquid tank having the liquid to be filtered (22) through a suitable pipe and non return valve.
The said tank (11) is totally sealed and is air tight / leak proof and is mounted on wheels. During off position the said filters (12, 13, and 14) are kept in closed position and the number of said filter bags may vary from 2 to 6 depending on the size of liquid tank.
When motor (8) is started, vacuum pump (1) starts and sucks the air from the tank (11), filters (12, 13 & 14) and delivers it out through its exhaust (4). Instantly, vacuum is generated in the tank (11). When inlet valves (21) of one of the said filter is opened, liquid from tank (22) is sucked immediately. This creates a pressure
5

difference between tank (11) and pipe. The liquid under filtration is then positively sucked into the common pipe (15) and through filter ( 12,13,14) the liquid flows to tank(ll). During this process contaminants are separated and caught into the filter bag. Filtered liquid is thereby collected into the tank (11). This filtered liquid can be stored into the tank (11) and the level of the filtered oil or fluid can be seen through a level indicator. If required the tank under filtration can be cleaned once it is emptied and residual settled at the bottom of tank can be removed. If required filtered liquid can be further refine filtered by at least one micro filter (17) connecting in a return liquid path of delivery pipe and retuned back the filtered liquid to liquid tank under filtration (22) through out let (18).
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof.
6

WE CLAIM
1. A non contact type liquid filtration system comprising:
a vacuum suction pump interconnectively fixed on an air tight liquid tank
through a suction pipe and suction chamber, said pump being driven by a
motor through a power transmission system;
at least one filtering means fitted inside the said tank in a sealed manner and
connected to a common pipe through a regulating device, the said common
pipe in turn being connected to a liquid tank under filtration through a
suitable pipe;
a delivery pump mounted on and connected to said liquid tank through a
suitable pipe and a non return valve, to deliver filtered liquid back to liquid
tank under filtration.
2. The system as claimed in claim 1 wherein the said delivery pump is connected to a liquid tank through a suction strainer to protect said delivery pump from damage.
3. The system as claimed in claims 1 and 2 wherein said filtering means are plurality of filter bags with similar or different grade filter units.
4. The system as claimed in claims 1 to 3 wherein at least one micro filter is connected in a return liquid path of said delivery pump to have further refined filtration of liquid.
5. The system as claimed in claim 1 wherein the said filtering means is fitted to said liquid tank with the help of flange and fasteners or flange and quick couplings.
7

6. The system as claimed in claims 1 to 5 wherein a wire mesh structure is kept inside the said filtering means to prevent collapsing of filtering means under vacuum.
7. The system as claimed in any one of the preceding claims wherein a vacuum gauge is mounted on the said common pipe to check the vacuum pressure inside the tank.
8. A method of filtering a liquid using the apparatus as claimed in claims 1 to 7 comprising the steps of:

- starting the motor connected to the vacuum pump to enable suction of the air from the liquid tank;
- delivering the air sucked from within the tank to the atmosphere outside thereby creating vacuum inside the tank;
- opening the inlet valve of the filtering means to allow the liquid under filtration to pass into the common pipe by siphon effect due to the pressure difference between the tank and pipe;
- filtering the sucked liquid through filtering means to separate the contaminated particles present in the liquid under filtration;
- optionally further filtering the filtered liquid by atleast one micro filter;
- collecting and storing the filtered liquid in the liquid tank.
9. The method as claimed in claim 8, wherein it comprises an optional step of
cleaning the liquid tank under filtration once it is emptied and removing the
residual settled at the bottom of said tank.
8

10 .A non contact type liquid filtration system and method substantially as herein described with reference to figs. 2 to 5 of the accompanying drawings.

ABSTRACT
Title: Non Contact Type Liquid Filteration System
This invention relates to non contact type liquid filtration system comprising of a vacuum pump mounted on a liquid tank and is driven by electrical motor, a suction inlet chamber for said vacuum pump mounted on top surface of the liquid tank, said tank is totally sealed and leak proof, filter elements kept inside the above said sealed tank, delivery pump, suction strainer for delivery pump, suction inlet pipe and return out let pipe, motors coupled to above mentioned pumps through a power transmission system.
Once vacuum pump is started, vacuum pump sucks air from filtration system tank /chamber, filters bags, suction inlet pipe and delivers the sucked air to atmosphere through exhaust outlet continuously and because of which a pressure difference is created and fluid under filtration is sucked positively into filtration chamber through filter.
Filtered liquid is stored in filtration system tank and tank under filtration is cleaned totally if required to remove the residual settled at bottom the of tank .After cleaning of the tank filtered liquid is returned back to source tank with the help of delivery pump and in line optional filter. Fig.3

NON CONTACT TYPE LIQUID FILTRATION SYSTEM

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