Patent GB-684634-A (GB)
Title: Improvements in or relating to filters
Inventor: KOVACS JULIUS PAUL
IPC: B01D29/11
Filed: 1950-06-27
Abstract: 684,634. Filters. PUROLATOR PRODUCTS, Inc. June 27, 1950. No. 160016/50. Class 46 A filter comprises a cylindrical casing, a stamped sheet metal bracket having a section shaped to receive a portion of the casing, the cylindrical casing being seated in the section permanently attached thereto (e.g. by brazing), a pipe projecting through the bottom of the casing, a fitting receiving the end of the pipe and having outlet communication with the pipe, means providing an inlet communication to the casing, a filtering unit in the casing and means including the pipe for directing fluid. flow in the casing through the filtering unit. Oil to be filtered enters an aperture 12, Fig. 3, in a flat portion 11 of a bracket 10 and passes into a fitting 26 secured to the lower end of a pipe 20. It rises on the right of a partition 30 into a bowl 31 and flows between the rim of the latter and a flexible diaphragm 32 into a cylindrical casing 15 secured in a half-cup portion 14 of the bracket 10. It flows inwards through an annulus 36, of filtering material into an annular chamber 37 whence it flows via apertures 39 and 39a into the pipe 20. It leaves by an aperture 13 on the left of the partition 30. Unfiltered oil is prevented by end discs 35, which fit closely round the pipe 20, from reaching the chamber 37 directly, but if the oil is supplied at such a rate that it cannot all pass through the annulus 36 some of it flows through apertures 25 in a hollow rod 21, depresses a piston valve 42 and flows through apertures 39b in the pipe 20 into the annular chamber 37. In the embodiment of Fig. 4 the incoming oil passes up a tube 50 within the pipe 20, continues up the inside of the hollow rod 21 and passes out through the apertures 25 to the inside of the casing 15. It flows through the annulus 36 into the chamber 37, through apertures 52 in the pipe 20 into an annular space 53 between the pipe 20 and tube 50, and out by an aperture 13. The apertures in the discs 35 have the same diameter in this embodiment as the annular space 37. Under excessive inlet oil pressure relief valves 57 in a housing 54 are forced open, and unfiltered oil passes through apertures 56 in the housing 54, and thence through an aperture 35a in the upper disc 35 to the chamber 37. The housing 54 is prevented from slipping off the rod 21 when the latter is unscrewed from the pipe 20 and removed with the cap 18, by staking 21a. In the embodiment of Fig. 5 the oil normally flows in the same way as in that of Fig. 4. Under excessive inlet pressure oil flows through apertures 71 in an inverted cup-shaped member 69, forces downward a sleeve valve 65 and passes through apertures 64 in the hollow rod 21, and apertures 63 in the pipe 20 to the annular space 61. A flange 67 on the sleeve valve 65 is normally pressed against a shoulder on the outside of the hollow rod 21 by a spring 68 in a cup-shaped member 66 secured to the rod 21. In the embodiment of Fig. 6 oil enters at 83 and leaves through the pipe 20 and fitting 84. By-pass flow is through passageways 25 and past the ballvalve 77. The casing 15 is seated in a half-ring-shaped section 14.