US2566463A

US2566463A - Filter unit

Info

Publication number: US2566463A
Application number: US51395A
Authority: US
Inventors: Stephen G Orban
Original assignee: Bendix Aviation Corp
Current assignee: Bendix Aviation Corp
Priority date: 1948-09-27
Filing date: 1948-09-27
Publication date: 1951-09-04
Anticipated expiration: 1968-09-04

Description

S. G. ORBAN Sept. 4, 1951 FILTER UNIT Filed Sept. 27, 1948 INVENTOR. g TEPHE/V ORB/4N Patented Sept. 4, 1951 FILTER UNIT Stephen G. Orban, Bloomfield, N. J., assignor to Bendix Aviation Cor poration, Teterboro, N. J.,

acorporation of Delaware ,Applicationseptember 2'7, 1948, Serial No. 51,395

11 Claims. '1

The present invention relate to a unit for filtering and removing dirt, dust and tobacco tar and the like from a fluid, such as air, and particularly to means of this ,charactenadapted as partofavalve. Among 'the objects of the invention are to protect valves and thelike in certain service, as in'aircraft, against deleterious substances, such as dust, dirt and 'thecontents of tobacco smoke, such as tar, and to obtain the "result by novel efiective means.

Other objects are-to provide such meansin the form of a unit of almost negligible Weight, few and simple parts of great ease of "assembly and disassembly, and permanent position.

Another object is to provide a filter and to bacco tar remover which, 'wh'enused with a light weight valve, originallyintended for small planes only, enables it to be effectively employed on airliners, for instance, Where the duty is much heavier. a

The above and other objects and features of the invention will appear more iullyhereinafter from a consideration of the following description taken in connection with the accompanying drawing whereintwd-ernbodiments of the invention are illustrated by way of-example.

i In thedrawing:

Figure 1 is a side view on an enlarged scale generally in 'section of a suction valveand filter unit combinationoftheinvention, V

Figure 2 is amend-elevation of thedevice of Figure 1, view from-the' left, V

Figure 3 is a view taken substantially along the line 3--3 -of-Figure 1, aspring of Figure 1 being omitted, and 1 Figure .4 is a vlewsimilarto Figure 1 of the invention in modified form.

Referring to thedrawing:

The device of Figures 1, 2 and 3 embodies a suction regulating valve l ll adapted for inclusion in a fluidcircuit and comprising an outlet opening I2 and an inlet opening .l4, and-embodying a tubular member 16 :comprising a body portion 18 forming an openin 12.. The body portion is has a reduced-diameter tubular extension 20 of .a smaller diameterthan -.the body portion 18 andcoaxial with thewopening l2 Theextension 20 ,has a closed end and is arranged soas to provide a valve guide having .side-wall port means 22 communicating with :a bore 26 vofuthe tubular-member l6. a

A sleeve valve 28, longitudinally movable on the tubular extension 2Q,- wcooperates with the port means 22 control ,fi uid flow through the port means 22 'from the inlet I4 to the outlet l2. The sleeve 28 is biased toward open position, or to the right as shown in Figures 1 and 4, as by a spring 30. The sleeve 28 carries a piston 32.

Enclosing the above-designated element is a tubular housing 34 in which is provided the inlet opening I 4. The housing 34 telescopically surrounds the body I8 and is connected thereto, as by a pin 36. Housing 34 forms a cylinder 38 for the piston 32 and includes a side-wall aperture or venting means disposed in the housing 34 so as to open into cylinder 38 between the piston 32 and the body portion I 8.

The venting means 40, as shown, opens 'from the cylinder 38 into a portion 42 of the housing 34'having a circular outer cross-section disposed between lateral ridges 44 of polygonal perimetral contour as shown in Figure 3, defining a, tubular filtered-fluid channel 46 in communication with the aperture means 40. The housing 34 has a seal-receiving circular-section outer-surface zone between each of the ridges 44 and an adjacent perimeter housing end section 50 and 5| of like polygonal contour, which in this case is'hexagonal.

A .pair of ring-

like seals

52 and 53, of elastic rubber or the like, each having a rim section 54 of channel section facing each other, are spaced apart and mounted on the housing 34. Each

seal

52 and 53 ispremoldedto have inner

perimetral portions

56 and 58 conform to its said circular-section seal-receiving surface zone 48 and to the adjacentpolygonal end section .50 and. 5| respectively. The seals are .held in removable binding relation to the

portions

56 and 58, and

a cylindrical filter element .60 removably mounted telescopically fitslthehousing between, and has its ends positionedin the seal channels 54 and is yieldably removably clamped by, and between the seal channel sides.

In assembly, the filterelementlfifl and the rings 52 and -53 are simply slipped over the ends of the housing 34 to the positions shown in Figure 1, with the ends of the element .60 in the ring channel held laterally thereby, and the polygonal portions 58 of the seals fitting the corresponding contours of the ends 50 and 5|. In this position, aircannot be drawn into the valve except through pores or interstices of the filter 50 which may be of a type well known in the art, made up of a paper :ribbon, uniformly wrinkled crosswise, wound in a close packed edgewise helix andlmpregnated with a suitable phenolic condensation ,product which may be polymerized by electric induction heating. Other asccAce suitable materials, such as felt and cellulose fiber, may be employed in the filter.

In the structure as shown, the filter element 60, which longitudinally bridges the aperture means 40, is supported intermediate its ends, and spaced from the housing 34, by the hexagonal ridges 44 which touch the inner side of the cylindrical filter 60 only at intersections 62 of polygon sides 64, as shown in Figure 3, so as to provide spaces 65 between the latter sides and the inner surface 68 of the filter whereby the fluid may fiow past the ridges 44 along the housing.

When the filter becomes unduly loaded with trapped dust, tobacco tars, nicotine or other substance, it may be cleared in a few minutes by dismounting the valve, removing the filter, reversing the direction of fiow therethrough, or by other simple means, and reassembling the filter, the seals and the housing and reinstalling the valve.

Thefilter may be reinforced by filter paper between the filter and the housing, and'the device may be modified as indicated in Figure 4. I

' In Figure 4, the device maybe considered as constructed substantially from the structure above set forth, as by cutting a helical groove along the outer'surface of the housing 34, right through the ridges 44, between points within the seals 52.

' It is of note that, in this case, the openings 40 may not lie diametrically opposite one another,

but are placed between convolutions of the helical groove 10.

A cord or strand [2 of loose packed cotton-like material suitably treated, as, is well known in the art, so as to have a high affinity and ability for absorbing tobacco smoke tars and nicotine, is wound in the groove 10, substantially to bridge the channel 45 radially, to tend to cause air entering throughthe filter 60 to fiow around the helical space 14, in opposite directions from opposite ends of the space, toward one or another of the openings 40. The small amount of air passing through the filter 60 directly opposite the openings 40 may not travel along the space 14 for any substantial distancabut inthe aggregate, the air will fiow, in the space 14 to the openings 40. In the space 14, the tar-laden air will contact the cord 72 to-deposit tar on the cord and prevent it from reaching and clogging the working valve partsl o In the operation of the sleeve valve 28 which may be of the type. disclosed in the copending application SerialNo. 793,968 filed December 26, 1947,.by Walter D. Teague, Jr., it will be seen that the application of suction to the outlet opening 12 will apply a negative pressure to one side of the piston 32 while a positive atmospheric or cabin pressure will be applied to the opposite side of the piston 32 through the port 40 in opposition to the biasing force of the spring 30. The outlet opening 12 may be connected to a variable source of suction such as a pump driven by the aircraft engine, while the inlet opening I4 may be connected by a suitable conduit to an air driven instrument such as a rate of turn gyro, a directional gyro' or an artificial horizon indicator mounted in a supercharged aircraft cabin and having an air intake port open to cabin pressure, as described and shown in U. S. Patent No. 2,402,500 granted June 18, 1946, to Donald M. Lawrence and assigned to Bendix Aviation Corporation. The inlet opening I4 thus leads through the air driven instrument'from the atmosphere or cabinpressure. The latter-atmospheric or cabin pressure acts upon piston 32 through the port 40.

The force thus acting on the piston 32 will tend to adjust the sleeve valve 28 relative to the port 22 so as to maintain a predetermined differential between the atmospheric or cabin pressure and the suction ornegative pressure at the inlet opening 14; The provision of I the filter G0 prevents dust, dirt and tobacco tar encountered particularly in the atmosphere of the cabins of commercial air liners from interfering with the operation of the sleeve valve. Without the provision of the novel filter arrangement the sleeve valve 28 may become stuck or operated badly after only 700, hours operation due to dust, dirt and tobacco tar which may be readily eliminated by the novel filter 60 arranged so as to surround the opening 40.

Although only two embodiments of the invention have been illustrated and described, various changesin the form and relative arrangements of the parts maybe made to suit require-' ments.

What is claimed'is:

l. The combination with a suction valve having inlet and outlet openings and a tubular member between, and 'including'a body forming one of said openings and having a reduced-diameter tubular extension coaxial with said one opening, said tubular extension having a bore and forming a guide having side-wall port means opening into said bore and a partition across the extension bore, a sleeve valve axially slidable on the guide controlling fiuid flow throughJthe port means and biased toward open position, and a piston on the sleeve, of a, tubular housing hav-; ing the other of said openings and telescopically fitting and connected to the body and forming a-cylinder for the piston, venting means in said housing, a cylindrical filter about said housing defining an unimpeded annular chamber between the filter andthe housing, a plurality of ridges on said housingdefining segmental passages with said filter, said venting means openingfrorn one of said passages into the cylinder between the piston and the bo the housing having a seal-receiving circular-section outersurface zone between the opposite side of each ofsaid ridgesand an adjacent perimetral hous-. ing end section of like polygonal contour, a pair of ring-like'seals of elastic rubberor the like each having channel rimsection having its open. side facing theothen-each of saidseals being premolded to have inner perimetral portions conform to its said seal-receiving surface zone and to the adjacent polygonal end section, respectively, in removablebinding'relation thereto, said venting means being betweenconvolutions of helical outer surface groove means of said housing, ;said filter removably telescopically fit-. ting the housing'between and havingits ends in the seal channels yieldably removably clamped by and between the seal channel sides,- and a helical body in said groove means of 'material adapted to absorb tobacco smoke tars.-

2. The combination with a suction valve having inlet and outlet openings and a tubular mem-= ber' between, andin'cluding a body forming one of said openings and having a reduced-diameter tubular extension coaxialwithsaid one opening, said tubular extension havinga bore and forming a guide having side-wall port means opening intosaid bore and a partition across the extension bore, a sleeve valve axially slidable on tliel'guide controlling fluid new throughzthe valve and port means and biased toward open position, and a piston :on the sleeve, of a tubular housing having the other of said openings and telescopically fitting and connected to the body and forming a cylinder for the piston, venting means in said housing, a cylindrical filter about said housing defining an annular chamber between the filter and said housing, a plurality of ridges on said housing defining segmental passageswith said filter, said venting means opening from one of saidpassages into the cylinder between the piston and the body, the housing having a seal-receiving circular-section outersurface zone between the opposite side of each of said ridges and an adjacent perimetral housing 'end section of like polygonal contour, a pair of ring-like seals of elastic rubber or the like having channel rim section having its open side facing the other, each of said seals being premolded to have inner perimetral portions conform to its said seal-receiving surface zone and to the adjacent polygonal end section, respectively, in removable binding relation thereto, said filter removably telescopically fitting the housing between and having its ends in the seal channels yieldably removably clamped by and between the seal channel side.

3. In a suction regulating unit, the combination of a tubular housing having inlet and outlet ends and a circular section within said housing defining a chamber therewith, a plurality of ridges dividing said chamber and forming axis parallel segmental channels between said divisions, at least one vent passage communicating said through passage with said chamber, the housing having a circular outer seal-receiving surface zone between the opposite side of each of said ridges and a next adjacent housing end section of like contour, a pair of ring-like seals of elastic rubber or the like each having the axial section of its rim of channel section having the open channel side facing the corresponding side of the other and each premolded to have its inner perimeter conform to its said seal-receiving surface zone and to the adjacent polygonal end section in removable binding relation thereto, and a cylindrical filter removably telescopically fitting the housing between and having its ends in the seal channels yieldably clamped by and be tween the seal channel sides.

4. The combination of a tubular housing adapted for inclusion in a fluid circuit and closed to the exterior of the circuit, a plurality of vent holes through a length of the housing to a filtered-fluid channel around the housing, a plurality of ridges on said housing forming segmental passages, the housing having an outer seal-receiving zone between the opposite side of each ridge and a next adjacent housing end section, a pair of elastic eals surrounding the housing each having the axial section of its rim of channel section having the open channel side facing the corresponding side of the other and its inner perimeter conforming to its adjacent housing receiving zone and end section in removable binding relation thereto, and a tubular filter removably telescopically fitting the housing between and having its ends in the seal channels yieldably clamped by and between the seal channel sides, said ridges supporting the filter and providing for the flow of fluid past the ridges along the housing in communication with said venting holes.-

5. The combination :of a tubular housing" adapted for inclusion in a iiuid circuit and closed to the exterior of the circuit, a plurality of vent holes through a length of the housing to a fluid channel around the housing, a tubular filter about the housing, a plurality of ridges on said housing forming segmental passages with said filter, the housing having an outer seal-receiving zone between the opposite side of each ridge and a next adjacent housing end section, a pair of elastic seals surrounding the housing each having the axial section of its rim of channel section having the open channel side facing the corresponding side of the other and its innerperimeters conforming to it adjacent housing receiving zone and end, section in removable binding relation thereto, said filter removably telescopically fitting the housing between and having its ends in the seal channels yieldably clamped by and between the seal channel sides.

6. The combination of a tubular housing adapted for inclusion in a fluid circuit and closed to the exterior of the circuit a vent hole through a length of the housing to a fluid channel around the housing, a plurality of ridges on said housing, the housing having an outer seal-receiving zone between the opposite side of each ridge and a next adjacent housing end section, a pair of elastic seals surrounding the housing in removable binding relation thereto, and a tubular filter removably telescopically fitting the housing and disposed therefrom to form an annular channel between the housing and itself, and said tubular filter held in position and sealed at its ends by said elastic seals.

7. The combination of a housing adapted for inclusion in a fluid circuit and having aperture mean through a side of the housing in communication with a fluid channel at the outer side of the housing, seal means held to the housing, a filter disposed over and defining the channel and held in position and sealed relative to the housing by said seal means, and a nicotine absorbing material in said channel to absorb tobacco smoke tars.

8. In a valve, the combination of a housing having an inlet, an outlet and a vent, valve mean within said housing responsive to exterior air pressure applied through the vent, and means for filtering and removing tobacco-smoke tar from air drawn into the vent including a tubular element within which said housing is positioned.

9. The combination of a housing adapted for inclusion in a fluid circuit and having aperture mean through a side of the housing in communication with a fluid channel at the outer side of the housing, elastic seal means bindingly self held to the housing, a filter removably disposed over the housing so as to define the channel and bindingly held in position and sealed relative to the housing by said elastic seal means, and a strand of nicotine absorbing material wound helically about the housing and within said channel to absorb tobacco smoke tars.

10. The combination of a housing adapted for inclusion in a fluid circuit and having aperture means through a side of the housing in communication with a fluid channel at the outer side of the housing, sealing means, a filter disposed over said housing so as to define the channel and held in position and sealed relative to the housing by said sealing means, and a nicotine absorbing material to absorb tobacco smoke channel about said housing communicating with said aperture means.

11. The combination of a housing adapted for inclusion in a fluid circuit, filter means disposed about said housing, mounting means for said filter means affixed about the exterior of said housing and constructed and arranged to sealingly engage the opposed ends of said filter 1 means, said filter means and mounting means defining with the exterior surface of said housing a channel surrounding said housing, said housing having an aperture in the side wall thereof providing communication between the 15 interior of said housing and said channel, and tobacco smoke tar absorbing means disposed within said channel and substantially interposed between' said filter and the aperture in the ide wall of said housing. V V 1 1 V STEPHEN G. ORBAN.

5 REF RENCES CITED M The following references are of record in thefile of this patent:

' V UNITED STATES PATENTS 0 Number H Name 7 V V n h 619,569 'Hewe1 Feb. 14, 18Q 9 2,194,037 Thuma Mar. 19, 1940 2,448,157 Schneider Aug. 31, 1948 ---FOREIGN PATENTS Number Country Date Great Britain Jan. 24 1921 '7 Date