REFRIGERANT FILTER-DRIER

• US 3,841,490 A
• Filed: 08/08/1973
• Issued: 10/15/1974
• Est. Priority Date: 03/02/1972
• Status: Expired due to Term

• Current Assignee: Ardell J. Schelich, John E. Hoffman
• Original Assignee: Ardell J. Schelich, John E. Hoffman
• Inventors: Hoffman, John E., Schelich, Ardell J.
• Primary Examiner(s): Zaharna, Samih N.
• Assistant Examiner(s): Spitzer, Robert H.
• Application Number:
  US05/386,650
• Time in Patent Office: 433 Days
• Field of Search: 55/316,387-389 210/266,282-284,287-289,356,483-485,509,DIG.6
• US Class Current: 210/266
• CPC Class Codes: B01D 24/10 the filtering material being held in a closed container
• CPC Class Codes: B01D 27/02 with cartridges made from a mass of loose granular or fibrous material
• CPC Class Codes: B01D 29/00 Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
• CPC Class Codes: B01D 29/01 with flat filtering elements B01D29/39 takes precedence
• CPC Class Codes: B01D 53/26 Drying gases or vapours
• CPC Class Codes: F25B 43/003 Filters
• CPC Class Codes: Y10S 210/06 Dehydrators

Abstract

A filter-drier for refrigeration systems which includes a foraminous canister located in a housing, the housing having an inlet at one end and an outlet at the other end, and the canister engaging the housing adjacent the housing inlet to assure flow through the canister. An adsorbent material bed is contained in the canister. An elongate hollow wire form is disposed in the housing downstream of the canister and adsorbent material bed, the wire form having one end arranged toward the housing outlet and its other end disposed toward the canister. Disposed in the wire form and assuming substantially its shape, is a filter media of inorganic fibrous material, the wire form and filter media engaging the housing adjacent the housing outlet to assure flow through the filter media. The canister is peripherally spaced from the housing to provide a longitudinal flow channel therebetween to increase flow capacity. In the preferred embodiment, the wire form is a compression spring compressed between the housing and an end closure of the canister. The filter media in the spring extends to and engages the said end closure of the canister. Preferably, the filter media in the spring is of fiberglass having a density within the range of substantially 0.5 grams per cubic inch to substantially 5.0 grams per cubic inch.

Claims

1. A filter-drier for refrigeration systems, comprising:

a. a housing having an inlet at one end and an outlet at the other end, b. a foramInous canister located in the housing, the canister having one end engaging the housing adjacent the housing inlet to assure flow through the end of the canister, c. a loose granular adsorbent material bed engaging and contained in the canister, d. an elongate, hollow wire form disposed in the housing downstream of the canister and adsorbent material bed, the wire form having one end arranged toward the outlet and its other end disposed toward the canister, e. a filter media of inorganic fibrous material disposed in the wire form and assuming substantially the shape of the wire form, the wire form and filter media having one end engaging the housing adjacent the housing outlet to insure flow through the filter media, and f. the canister being peripherally spaced from the housing downstream of the canister end engaging the housing to provide a longitudinal flow channel therebetween to increase flow capacity by having flow through the canister end and then through only a portion of the longitudinal dimension of the adsorbent material bed in the canister and then into the flow channel and then through the filter media.

2. A filter-drier as defined in claim 1, in which:

g. the filter media is peripherally spaced from the housing downstream of the canister to provide an uninterrupted continuation of the flow channel.

3. A filter-drier as defined in claim 2, in which:

h. the longitudinal flow channel extends from the said one canister end engaging the housing to the said one wire form and filter media end engaging the housing.

4. A filter-drier as defined in claim 3, in which:

i. the wire form and filter media extend to and engage an opposite end of the canister.

5. A filter-drier as defined in claim 4, in which:

j. the wire form is a compression spring engaging the said opposite end of the canister under compressive spring loading to hold the canister and filter media in place.

6. A filter-drier for refrigeration systems, comprising:

a. a housing having an inlet at one end and an outlet at the other end, b. a foraminous canister located in the housing, the canister having a peripheral wall and opposed end closures, one end closure engaging the housing adjacent the housing inlet to assure flow through the end closure of the canister, c. a loose granular adsorbent material bed engaging and contained in the canister, d. a compression spring disposed in the housing downstream of the canister and adsorbent material bed, the spring being compressed between the housing and the other end closure of the canister to hold the canister in place, e. a filter media of inorganic fibrous material disposed in and held by the spring and assuming substantially the shape of the spring, the spring and filter media having one end engaging the housing adjacent the housing outlet to assure flow through the filter media, and the filter media extending to and engaging the said other end closure of the canister, and f. the canister, spring and filter media being peripherally spaced from the housing from the canister end closure engaging the housing to the spring and filter media end engaging the housing to provide a longitudinal flow channel therebetween to increase flow capacity by having flow through the said one end closure of the canister and through only a portion of the longitudinal dimension of the adsorbent material bed and then into and along the flow channel and then through a portion of the filter media.

7. A filter-drier as defined in claim 6, in which:

g. the filter media in the spring is of fiberglass having a density within the range of substantially 0.5 grams per cubic inch to substantially 5.0 grams per cubic inch to obtain optimum dirt capacity and filtration efficiency.