US4209401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter drier
Assignee: Emerson Electric Co
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Filing: 1978-04-20
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Granted: 1980-06-24
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Expires: 1998-04-20
Abstract
Abstract A filter drier finding application in a refrigeration system, for example, includes a tubular housing having improved fluid flow characteristics within the filtering media of the filter drier. The filter drier includes an axial arrangement of elements commencing at the inlet end of the housing with an absorbent material fill portion which extends across the diameter of the housing. The absorbent material fill portion includes first and second boundary layers spaced from one another, and absorbent material positioned between the boundary layers. The boundary layers are pervious to fluid flow. The axially innermost boundary layer, with respect to the inlet, includes a central hub portion which seats a first end of a coil compression spring. The coil compression spring has a tubular body part and an enlarged second end. Filter media in the form of a fibrous material is mounted about the body part of a coil compression spring, the filter material being sized so that an unobstructed flow path exists between its outer periphery and the inner periphery of the housing. A retainer is mounted along the second end of the spring and closes the flow path so that fluid flow necessarily passes through the filter material toward the center of the filter. Finally, a final layer of fibrous filter material and a positioning plate are provided along the outlet end of the housing.
Inventors
- 👤 Paul V. Henton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:12
CPC Classifications
F; F25; F25B; F25B43/00; F25B43/003; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D24/00; B01D24/02; B01D24/04; B01D35/00; B01D35/02; B01D36/00; B01D36/003; Y; Y10; Y10S; Y10S210/00; Y10S210/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
218 words
A filter drier, comprising: an elongated housing defining a chamber having a preselected diameter, said housing including an inlet and an outlet communicating with said chamber; a first perforate plate positioned in said housing near said inlet; a second perforate plate positioned in said housing and spaced from said first plate, said second plate having a hub area formed in it; adsorptive material fill between said first and said second plates; a spring, said spring including a cylindrical body portion having a first end and an enlarged second end, the first end of said spring being sized for reception in the hub area of said second plate said body portion defining an axial flow passage; filter media of inorganic fibrous material having a central opening therein mounted over said cylindrical body section of said spring, said filter media having a width less than the diameter of said housing to define an annular flow passage along the inner periphery of said housing; and antibypass means mounted adjacent the enlarged second end of said spring to block said peripheral flow passage so that fluid entering said inlet passes through said absorptive material, at least some flow passing along said annular flow passage until resistance to said flow forces the fluid inwardly of said filter media toward said axial flow passage.
Claim 2
Dependent Claim
218 words
A filter drier, comprising: an elongated housing defining a chamber having a preselected diameter, said housing including an inlet and an outlet communicating with said chamber; a first perforate plate positioned in said housing near said inlet; a second perforate plate positioned in said housing and spaced from said first plate, said second plate having a hub area formed in it; adsorptive material fill between said first and said second plates; a spring, said spring including a cylindrical body portion having a first end and an enlarged second end, the first end of said spring being sized for reception in the hub area of said second plate said body portion defining an axial flow passage; filter media of inorganic fibrous material having a central opening therein mounted over said cylindrical body section of said spring, said filter media having a width less than the diameter of said housing to define an annular flow passage along the inner periphery of said housing; and antibypass means mounted adjacent the enlarged second end of said spring to block said peripheral flow passage so that fluid entering said inlet passes through said absorptive material, at least some flow passing along said annular flow passage until resistance to said flow forces the fluid inwardly of said filter media toward said axial flow passage.
Claim 3
Dependent Claim
36 words
The filter drier of claim 1 including second filter media of inorganic fiber material positioned in said chamber axially outboard of said antibypass means; and a third perforate plate positioned in said housing near said outlet.
Claim 4
Dependent Claim
21 words
The filter drier of claim 2 wherein said first and second filter media of inorganic fibrous material are constructed from fiberglass.
Claim 5
Dependent Claim
14 words
The filter drier of claim 3 wherein said adsorptive material fill comprises silica gel.
Claim 6
Dependent Claim
23 words
The filter drier of claim 4 further including a wire screen member adjacent said first perforate plate, on the axially inboard side thereof.
Claim 7
Dependent Claim
24 words
The filter drier of claim 4 further including valve means along the outlet thereof, said valve means preventing back flow through said filter drier.
Claim 8
Dependent Claim
99 words
The filter drier of claim 6 wherein said valve means comprises a valve seat, a valve member movably mounted with respect to said valve seat between a first closed position and second open position; means for biasing said valve member toward said closed position, enclosure means about said valve member and said valve seat, said closure means having an opening in it for permitting fluid flow therethrough, said opening and said valve member being arranged so that said valve member moves a predetermined distance from said valve seat toward said open position before fluid flow through said valve occurs.
Claim 9
Dependent Claim
216 words
A filter drier, comprising: a housing having an inlet, an outlet, and an internal diameter; an absorbent material fill portion positioned along the inlet side of said housing and across the diameter thereof, said absorbent material fill portion including first and second boundary layers spaced from one another, and absorbent material contained between said boundary layers, said second boundary layer having a central receptacle formed in it; a coil compression spring having a central body part, said part having a first end positioned in said receptacle and an enlarged second end; filter media of fibrous material, said material having a central opening therethrough for placing said material about the body portion of said spring, said fibrous material having a dimension less than the diameter of said housing so as to define a flow path along the outer perimeter thereof between said housing and said filter media, said flow path having an annular shape in cross section; antibypass means mounted in said housing, said antibypass means having a portion closing the annular flow path along the second end of said spring so that fluid flow through said filter passes through said filter media toward said coil compression spring; second filter means axially outboard of said antibypass means; and a perforate plate outboard of said second filter means.
Claim 10
Dependent Claim
216 words
A filter drier, comprising: a housing having an inlet, an outlet, and an internal diameter; an absorbent material fill portion positioned along the inlet side of said housing and across the diameter thereof, said absorbent material fill portion including first and second boundary layers spaced from one another, and absorbent material contained between said boundary layers, said second boundary layer having a central receptacle formed in it; a coil compression spring having a central body part, said part having a first end positioned in said receptacle and an enlarged second end; filter media of fibrous material, said material having a central opening therethrough for placing said material about the body portion of said spring, said fibrous material having a dimension less than the diameter of said housing so as to define a flow path along the outer perimeter thereof between said housing and said filter media, said flow path having an annular shape in cross section; antibypass means mounted in said housing, said antibypass means having a portion closing the annular flow path along the second end of said spring so that fluid flow through said filter passes through said filter media toward said coil compression spring; second filter means axially outboard of said antibypass means; and a perforate plate outboard of said second filter means.
Claim 11
Dependent Claim
24 words
The filter drier of claim 8 further including valve means along the outlet thereof, said valve means preventing back flow through said filter drier.
Claim 12
Dependent Claim
14 words
The filter drier of claim 9 wherein said fibrous material filter media comprises fiberglass.
Claim 13
Dependent Claim
14 words
The filter drier of claim 10 wherein said absorbent material fill comprises silica gel.
Claim 14
Dependent Claim
223 words
A filter drier, comprising: a housing having an inlet, an outlet, and an internal diameter; an absorbent material fill portion positioned along the inlet side of said housing, said absorbent material fill portion including first and second boundary layers spaced from one another, and absorbent material contained between said boundaries; a coil compression spring having a central body part, said body part having a first end abutting one of said first and said second boundary layers of said absorbent material fill portion and an enlarged second end; filter media of fibrous material, said material having a central opening therethrough for placing said material about the body portion of said spring; second filter means axially outboard of the second end of said spring; a perforate plate outboard of said second filter means; and valve means along the outlet side of said filter drier, said valve means including a valve seat, a valve member movably mounted with respect to said valve seat between a first closed position and a second open position and enclosure means about said valve seat, said enclosure means having at least one opening therein for permitting fluid flow therethrough, said opening being positioned with respect to said valve member so that said valve member moves a positive predetermined distance from said valve seat before fluid flow through said opening is possible.
Claim 15
Dependent Claim
223 words
A filter drier, comprising: a housing having an inlet, an outlet, and an internal diameter; an absorbent material fill portion positioned along the inlet side of said housing, said absorbent material fill portion including first and second boundary layers spaced from one another, and absorbent material contained between said boundaries; a coil compression spring having a central body part, said body part having a first end abutting one of said first and said second boundary layers of said absorbent material fill portion and an enlarged second end; filter media of fibrous material, said material having a central opening therethrough for placing said material about the body portion of said spring; second filter means axially outboard of the second end of said spring; a perforate plate outboard of said second filter means; and valve means along the outlet side of said filter drier, said valve means including a valve seat, a valve member movably mounted with respect to said valve seat between a first closed position and a second open position and enclosure means about said valve seat, said enclosure means having at least one opening therein for permitting fluid flow therethrough, said opening being positioned with respect to said valve member so that said valve member moves a positive predetermined distance from said valve seat before fluid flow through said opening is possible.
Claim 16
Dependent Claim
94 words
The filter drier of claim 12 wherein the filter media of fibrous material has a dimension less than the diameter of said housing so as to define a flow path along the outer perimeter thereof between said housing and said filter media, said flow path having an annular shape in cross section, and antibypass means mounted in said housing, said antibypass means having a portion closing said annular flow path along the second end of said spring, so that fluid flow through said filter passes through said filter media toward said coil compression spring.
Claim 17
Dependent Claim
189 words
In a filter drier including a housing having an inlet and an outlet, and filter means in said housing, the improvement comprising valve means on the outlet side of said filter drier, said valve means including means for defining a valve seat along said outlet, all fluid flow through said filter drier passing through said valve seat, a ball valve member movably mounted with respect to said valve seat between a first closed position and a second open position, said ball valve member having an external diameter, means for biasing said ball valve member toward said closed position, closure means containing said valve member, said closure means having an internal diameter approximately equal to the external diameter of said ball valve member and adapted to receive said ball valve member in a free, sliding fit, said closure means having at least one opening therein for permitting fluid flow through said valve seat, said valve member and said opening being arranged so that said valve member moves a predetermined, positive distance from said valve seat along said closure means before fluid flow through said valve seat and said opening occur.
Claim 18
Dependent Claim
189 words
In a filter drier including a housing having an inlet and an outlet, and filter means in said housing, the improvement comprising valve means on the outlet side of said filter drier, said valve means including means for defining a valve seat along said outlet, all fluid flow through said filter drier passing through said valve seat, a ball valve member movably mounted with respect to said valve seat between a first closed position and a second open position, said ball valve member having an external diameter, means for biasing said ball valve member toward said closed position, closure means containing said valve member, said closure means having an internal diameter approximately equal to the external diameter of said ball valve member and adapted to receive said ball valve member in a free, sliding fit, said closure means having at least one opening therein for permitting fluid flow through said valve seat, said valve member and said opening being arranged so that said valve member moves a predetermined, positive distance from said valve seat along said closure means before fluid flow through said valve seat and said opening occur.
Claim 19
Dependent Claim
227 words
A filter drier, comprising: a housing having an inlet, an outlet, and an internal diameter; p1 an absorbent material fill portion along the inlet side of said housing, said absorbent material fill portion including first and second boundary layers spaced from one another, and absorbent material contained between said boundaries; a coil compression spring having a central body part, said body part having a first end abutting one of said first and said second boundary layers of said absorbent material fill portion and an enlarged second end; filter media of fibrous material, said material having a central opening therethrough for placing said material about the body portion of said spring, said fibrous material having a dimension less than the diameter of said housing so as to define a flow path along the outer perimeter thereof between said housing and said filter media, said flow path having an annular shape in cross section; antibypass means in said housing, said antibypass means having a portion closing the annular flow path along the second end of said spring so that fluid flow through said filter passes through said filter media toward said coil compression spring so that removal of contaminents carried in said fluid by said filter commences at the end of said filter nearest the outlet of said housing; and second filter means axially outboard of said antibypass means.
Claim 20
Dependent Claim
227 words
A filter drier, comprising: a housing having an inlet, an outlet, and an internal diameter; p1 an absorbent material fill portion along the inlet side of said housing, said absorbent material fill portion including first and second boundary layers spaced from one another, and absorbent material contained between said boundaries; a coil compression spring having a central body part, said body part having a first end abutting one of said first and said second boundary layers of said absorbent material fill portion and an enlarged second end; filter media of fibrous material, said material having a central opening therethrough for placing said material about the body portion of said spring, said fibrous material having a dimension less than the diameter of said housing so as to define a flow path along the outer perimeter thereof between said housing and said filter media, said flow path having an annular shape in cross section; antibypass means in said housing, said antibypass means having a portion closing the annular flow path along the second end of said spring so that fluid flow through said filter passes through said filter media toward said coil compression spring so that removal of contaminents carried in said fluid by said filter commences at the end of said filter nearest the outlet of said housing; and second filter means axially outboard of said antibypass means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-24 | 1983-12-24 | 1984-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-24 | 1987-12-24 | 1988-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-24 | 1991-12-24 | 1992-06-24 | $7700.00 | Window Closed / Lapsed |