US3224584A

US3224584A - Combination filter and unloading valve

Info

Publication number: US3224584A
Application number: US184339A
Authority: US
Inventors: Nils O Rosaen
Original assignee: Rosaen Filter Co
Current assignee: Rosaen Filter Co
Priority date: 1962-04-02
Filing date: 1962-04-02
Publication date: 1965-12-21
Anticipated expiration: 1982-12-21

Description

Dec. 21, 1965 N; o. ROSAEN COMBINATION FILTER AND UNLOADING VALVE Filed April 2, 1962 2 Sheets-Sheet 1 F15. l. l 3

ATTQRNEYJ INVENTOR. IV/LS o. ROS/JEN BY fiue flq RESERVOH? Dem 1965 N. 0. ROSAEN 3,224,584

COMBINATION FILTER AND UNLOADING VALVE Filed April 2, 1962 2 Sheets-Sheet 2 RESERVOIR BY PASS G NEEDS OFERATNG INVENTOR. j N/LJ O. ROSA/5N United States. Patent 3,224,584 COMBINATION FILTER AND UNLOADING VALVE Nils 0. Rosaen, Bloomfield Hills, Mich, assignor to The Rosaen Filter Company, Hazel Park, Mich a corporation of Michigan Filed Apr. 2, 1962, Ser. No. 184,339 7 Claims. (Cl. 21091) This invention relates to fluid filters and more particularly to a filter device having means operable to provide a continual circulation of fluid even when the user is not operating.

It is important in. fluid systems utilizing a heated fluid or fluids which will thicken or separate upon being permitted to stand for even limited periods of time that the fluid be kept in constant circulation even while the user is not operating. The present invention provides a filtering device producing this result and at the same time having means insuring that any fluid reaching the user will be properly filtered.

It is an object of the present invention then to prevent fluid from remaining immobile while the user is not operating by providing means automatically operable upon non-use of the user to circulate fluid back to the fluid reservoir.

It is a further object of the present invention to prevent unfiltered fluid from reaching the user while at the same time insuring that the filter Will not rupture by providing means operable to conduct fluid past the filter and the user if the filter becomes clogged.

It is yet another object of the present invention to improve filter devices by providing means indicating the clogged condition of the filter as Well as the circulating condition of the fluid.

Still further objects and advantages will readily occur to one skilled in the art to which the invention pertains upon reference to the following drawings in which like reference characters refer to like parts throughout the several views and in which FIG. 1 is a cross sectional view of a preferred embodiment of the present invention.

FIG. 2 is a cross sectional view similar to FIG. 1 but illustrating the device in a different operating position.

FIG. 3 is a cross sectional view taken substantially at line 3-3 of FIG. 1.

FIG. 4 is a cross sectional view taken substantially at line 4--4 of FIG. 1, and

FIG. 5 is a top elevational view of the device shown in FIG. 1.

Now referring to the drawings for a more detailed description, a preferred filter device is illustrated as comprising a body member having a preferably substantially cylindrical filter chamber 11. A cap member 12 is secured to the body member 10 by bolts 12A or the like and closes one end of the filter chamber 11. An O-ring seal 13 is provided between the body member 10 and the cap member 12. An inner wall portion 14 of the body member 10 is provided at the end of the filter chamber 11 opposite the cap member 12.

The cap member 12 has an outlet chamber 15 which provides communication between the filter chamber 11 and an outlet 16. The outlet 16 is adapted to be connected to a user 17.

Aligned openings 1819 are provided in the cap member 12 and the wall portion 14 respectively and provide the means by which a rod 20 is carried. The rod 20 has a threaded end portion 21 and a flanged end portion 22. A nut member 23 cooperates with the flanged end portion 22 to prevent displacement of the rod 20; The rod 20 has a hollow portion 24 which extends from the end carried in the wall portion 14 to a point spaced from the ice threaded end portion 21. O-

ring seals

25A and 25B prevent fluid leakage through the openings 18 and 19 respectively. The rod 20 is provided with a reduced portion 20A. An outwardly extending cylinder 26 is provided on the body member 10 in alignment with the opening 19 and is provided with an outlet 27 adapted for connection with a fluid reservoir 28. A cap 29 is secured to the cylinder 26 by any means such as screws 29A. The cap 29 is provided with a threaded opening 29B in axial alignment with the opening 19.

A threaded rod 30 is carried in the threaded opening 29B and has a shank portion 31 disposed in the cylinder 26. A lock nut 32 locks the rod 30 in a desired axial position. A spring member 33 bears against a seat 33A carried by the rod 30 and urges a frusto-conical valve member 34 to move axially along the rod 30 and extend into the end of the hollow portion 24 of the rod 20. The hollow portion 24 has an inner peripheral surface 35 which forms a seat for the valve 34.

An inlet 36 is provided in the body member 10 opening to the filter chamber 11 and adapted for connection to a pump 37. The pump 37 is preferably connected to the fluid reservoir 28.

A filter assembly 38 is axially slidably carried on the rod 20 in the filter chamber 11 intermediate the inlet 36 and the outlet chamber 15. The filter assembly 38 comprises a preferably cylindrical filter element 39 having a porous surface and a carrier structure 40. The carrier structure 40 preferably comprises an annular member 41 having anintegral cylindrical boss portion 42 and an annular flange portion 43. The carrier structure 40 also comprises an annulus 44 having a surface 45 closely adjacent the body member 10 and a flange portion 46 extending inwardly from a surface 47 opposite the surface 46. A seal 48 is seated in an annular recess 49 provided in the surface 45 and slidably engages the body member 11. The flange portion 46 is preferably provided with side surfaces 50 which incline inwardly from a point spaced from the end of the flange portion 46 and extend closely adjacent to the peripheral surface of the rod 20 when the carrier structure 40 is in the position shown in FIG. 1. Annularly spaced screws 51 join the annular member 41 and the annulus 44 and act to retain the filter element 39 sandwiched therebetween. The flange portion 46 is provided with a port 46A. The boss portion 42 is provided with a plurality of annularly spaced ports 52.

The rod 20 is provided with a plurality of annularly spaced ports 53 which open to the hollow portion 24 and Which are disposed to register with the openings 52 when the carrier structure 40 is abutting against the wall portion 14 as shown in FIGS. 1 and 4. A spring member 55 seats against the cap member 12 and urges the carrier structure 40 to move towardthe wall portion 14.

A pin 56 extends through the body member 11 and is provided at one end with a substantially annularly extending arm 56A which engages the flange portion 43 of the annular member 41. The other end of the pin 56 carries a pointer 58 exteriorly of the body member 11. An indicator plate 59 is secured to the exterior surface of the body member 11 and the pointer 58 is positioned to point to indicia printed on the indicator plate 59 as can best be seen in FIG. 5.

In operation, fluid is pumped from the reservoir 28 to the inlet 36 by the pump 37. The fluid enters the filter chamber 11 under pressure and will normally pass through the filter element 39. If the user 17 is operating, then a pressure differential will be produced across the annulus 44. When this differential is sufficient to overcome the spring member 55, the carrier structure 40 will move to the position indicated by the dotted lines shown in FIG. 1 and the fluid will pass through the out- 3 let chamber 15 and through the outlet 16 to the user 17. In this position the ports 52-53 no longer register and fluid is prevented from passing from the filter chamber 11 to the hollow portion 24 of the tube 20.

If the user is turned off and no longer requires fluid or the amount of fluid used is diminished, the pressure ditferential across the annulus 44 will diminish due to the increase in pressure at the outlet 16 and the spring member 55 will return the carrier structure 40 to the fullline position shown in FIG. 1. The port 46A insures that the carrier structure 40 will continue to move until it abuts the wall 14. In this position the flange portion 46 of the annulus 44 will extend closely adjacent the surface of the rod 20 to substantially close fluid flow from the inlet 36 through the outlet chamber 15 and through the outlet 16. Also in this position the ports 52-53 will be in registry and fluid will flow under pressure into the hollow portion 24. The pressure of the fluid will open the valve 34 against the force of the spring 33 and fluid will be returned by the pump 37 to the reservoir 28. The amount of pressure required to open the valve 34 may be varied by axially adjusting the rod 30 so that the opening of outlet 27 may or may not occur simultaneously with the closing of outlet 16.

Each of the positions of the carrier structure 40 will result in a corresponding position of the pointer 58. The indicator plate 59 then may be supplied with the proper indicia to indicate whether the user is operating or not operating as indicated in FIG. 5.

As the filter member 39 becomes clogged, a pressure differential will be created across the annular member 41 which will cause the carrier structure 40 to move even farther away from the wall portion 14 as shown in the dotted line position of FIG. 1. The pointer 58 will assume a position corresponding to this axial movement of the carrier structure 40. When the filter member 39 becomes so clogged that there is danger of it rupturing, the carrier structure 40 will have moved to a position even farther away from the wall portion 14. In this position the boss portion 42 will have moved past the ports 53 and fluid will enter the hollow portion 24, open the valve 34, and be returned to the reservoir 28. The pointer 58 will also indicate this position of the carrier structure 40.

It is apparent from the foregoing description that the present invention provides means preventing fluid from remaining inert even after the user is no longer being operated and a bypass means which insures that when the filter has become so clogged as to produce a danger of rupturing, the fluid will be pumped back to the reservoir.

It is apparent that many changes and modifications may be made in the present invention without departing from its spirit or the scope of the appended claims.

I claim:

1. A filter device comprising (a) a body member having an inlet and an outlet,

(b) a first rod carried in said body member,

(c) a filter member axially slidably carried on said rod intermediate said inlet and said outlet and comprising a filter element having a porous filter surface and a carrier structure,

(d) said body member being provided with an inner wall portion and a second outlet being provided in said inner wall portion,

(e) a first valve means disposed intermediate said filter element and said first mentioned outlet and responsive to a pressure increase at said first mentioned outlet to variably diminish fluid flow to said first mentioned outlet,

(f) said first valve means comprising means urging said carrier structure to abut against said inner wall portion, said carrier structure having an annular flanged portion axially aligned with said rod, said annular flanged portion extending closely adjacent a peripheral portion of said rod when said carrier structure abuts said inner wall portion whereby to substantially close fluid flow from the outlet side of said filter element to said first mentioned outlet, and said flanged portion moving away from said peripheral portion when said carrier structure moves axially away from said inner wall portion whereby to open fluid flow from the outlet side of said filter element to said first mentioned outlet,

(g) a second valve means carried in said body member intermediate sad inlet and said second outlet and operable to open a fluid flow through said second outlet in response to a predetermined decrease in the pressure diflerential between said inlet and said first mentioned outlet.

2. The device as defined in claim 1 and including means operable to open a bypass path directly from said inlet to said second outlet bypassing said filter element upon a predetermined increase in the pressure difierential across said filter element.

3. A filter device comprising r (a) a body member having an inlet, a first outlet and a second outlet,

(b) a filter element carried in said body member intermediate said inlet and said outlet,

((1) pressure responsive means axially movable within said body member in response to changes in the pressure differential across said filter element,

(d) means urging said pressure responsive means toward a first axial position,

(e) a first valve means actuated by said pressure responsive means to move to a position closing fluid flow through said first outlet at said first axial position of said pressure responsive means,

(f) said pressure responsive means being operable to move axially against said urging means and to a second axial position upon an increase in the pressure differential across said filter element,

(g) said first valve means being disposed intermediate the outlet side of said filter element and said first outlet and being actuated by said pressure responsive means to open fluid flow through said first outlet at said second axial position of said filter element,

(h) a second valve means disposed intermediate the inlet side of said filter element and said second outlet and actuated by said pressure responsive means to open fluid flow through said second outlet at said first axial position of said pressure responsive means and to close fluid flow through said second outlet at said second axial position of said pressure responsive means,

(i) said pressure responsive means being operable to move axially against said urging means and to a third axial position upon a further increase in the pressure differential across said filter element, and

(j) a bypass means disposed intermediate the inlet side of said filter element and said second outlet and actuated by said pressure responsive means to open fluid flow through said second outlet at said third axial position of said pressure responsive means.

4. The device as defined in claim 1, and in which said second valve means comprises (a) said first rod having a hollow portion at an end closely adjacent said inner wall portion and registering with said second outlet,

(b) a second rod carried in said body member in axial alignment with said hollow portion,

(c) a frusto-conical valve member slidably carried on said second rod and normally seated in said hollow portion,

(d) means urging said valve to seat in said hollow portion,

(e) means providing communication between the inlet side of said filter member and the hollow portion of said first rod when said carrier structure abuts against said wall portion, and

(f) said last mentioned means being operable to diminish fluid flow to said hollow portion as said carrier structure moves away from said wall.

5. The device as defined in claim 4 and in which said last mentioned means comprises ports in said carrier structure and said first rod which are positioned to register when said carrier structure abuts said wall.

6. The device as defined in claim 5 and including indicator means operably connected to said carrier structure and operable to indicate the axial position of said carrier structure with respect to said first rod.

7. The device as defined in claim 3 and including means carried exteriorly of said body member and engaging said pressure responsive means to indicate the axial position thereof.

References Cited by the Examiner UNITED STATES PATENTS 1,874,847 8/1932 Arnold 210-136 2/1938 Dalryrnplle 210-130 5/1947 Gilman 137-115 7/1947 LeClair 210-133 4/1948 Kasten 210-130 3/1950 Greer 210-90 3/1951 Schneider 137-115 4/1951 Hunter 210-130 9/1952 Davies 137-117 2/1957 Rainson 210-136 1/1963 Stroder 137-119 2/1963 Rosaen 210-90 3/1963 Rosaen 210-90 FOREIGN PATENTS 5/ 1958 Switzerland.

20 REUBEN FRIEDMAN, Primary Examiner.

HERBERT L. MARTIN, Examiner.

Claims

1. A FILTER DEVICE COMPRISING (A) A BODY MEMBER HAVING AN INLET AN INLET AND AN OUTLET, (B) A FIRST ROD CARRIED IN SAID BODY MEMBER, (C) A FILTER MEMBER AXIALLY SLIDABLY CARRIED ON SAID ROD INTERMEDIATE SAID INLET AND SAID OUTLET AND COMPRISING A FILTER ELEMENT HAVING A POROUS FILTER SURFACE AND A CARRIER STRUCTURE, (D) SAID BODY MEMBER BEING PROVIDED WITH AN INNER WALL PORTION AND SECOND OUTLET BEING PROVIDED IN SAID INNER WALL PORTION, (E) A FIRST VALVE MEANS DISPOSED INTERMEDIATE SAID FILTER ELEMENT AND SAID FIRST MENTIONED OUTLET AND RESPONSIVE TO A PRESSURE INCREASE AT SAID FIRST MENTIONED OUTLET TO VARIABLY DIMINISH FLUID FLOW TO SAID FIRST MENTIONED OUTLET, (F) SAID FIRST VALVE MEANS COMPRISING MEANS URGING SAID CARRIER STRUCTURE TO ABUT AGAINST SAID INNER WALL PORTION, SAID CARRIER STRUCTURE HAVING AN ANNULAR FLANGED PORTION AXIALLY ALIGNED WITH SAID ROD, SAID ANNULAR FLANGED PORTION EXTENDING CLOSELY ADJACENT A PERIPHERAL PORTION OF SAID ROD WHEN SAID CARRIER STRUCTURE ABUTS SAID INNER WALL PORTION WHEREBY TO SUBSTANTIALLY CLOSE FLUID FLOW FROM THE OUTLET SIDE OF SAID FILTER ELEMENT TO SAID FIRST MENTIONED OUTLET, AND SAID FLANGED PORTION MOVING AWAY FROM SAID PERIPHERAL PORTION WHEN SAID CARRIER STRUCTURE MOVES AXIALLY AWAY FROM SAID INNER WALL PORTION WHEREBY TO OPEN FLUID FLOW FROM THE OUTLET SIDE OF SAID FILTER ELEMENT TO SAID FIRST MENTIONED OUTLET, (G) A SECOND VALVE MEANS CARRIED IN SAID BODY MEMBER INTERMEDIATE SAID INLET AND SAID SECOND OUTLET AND OPERABLE TO OPEN A FLUID FLOW THROUGH SAID SECOND OUTLET IN RESPONSE TO A PREDETERMINED DECREASE IN THE PRESSURE DIFFERENTIAL BETWEEN SAID INLET AND SAID FIRST MENTIONED OUTLET.