Refrigerant drier

• US 4,811,571 A
• Filed: 03/28/1988
• Issued: 03/14/1989
• Est. Priority Date: 03/28/1988
• Status: Expired due to Fees

• Current Assignee: Thermo King Corporation (Trane Technologies plc)
• Original Assignee: Thermo King Corporation (Trane Technologies plc)
• Inventors: Mayer, Donald K.
• Primary Examiner(s): Capossela, Ronald C.
• Application Number:
  US07/173,911
• Time in Patent Office: 351 Days
• Field of Search: 62/474, 62/475, 210/DIG. 6
• US Class Current: 62/474
• CPC Class Codes: F25B 43/003 Filters
• CPC Class Codes: Y10S 210/06 Dehydrators

Abstract

A refrigerant drier constructed to maintain compression of a desiccant to reduce the formation of refrigerant contaminating dust caused by attrition of the desiccant when the drier is used in applications subject to vibration. The desiccant is maintained in compression by a compression spring and barbed spring follower. Composite laminated filters are disposed adjacent to each end of the desiccant, with each composite filter including a fiberglass filter pad, which has excellent filtration characteristics for preventing any attrition dust which is generated from leaving either end of the drier. Each composite filter also includes a filter pad selected for durability which is disposed immediately adjacent to the desiccant, to cushion and protect the fragile fiberglass from aggressive action by the dessiccant. Annular perimeter rings are disposed between the dessicant and the composite filters to prevent desiccant migration past the outer perimeters of the composite filters.

Claims

1. A refrigerant drier comprising:

a generally cylindrical, tubular body member having a wall defined by inner and outer surfaces which are symmetrical about a longitudinal axis, and first and second axial ends adapted for connection in a refrigeration system,

first and second perforated support plates disposed in spaced parallel relation in said body member, transverse to the longitudinal axis of said body member,

said first support plate being axially slidable within said body member, in close proximity to said inner surface,

said second support plate being fixed,

desiccant material in said body member, between said first and second support plates,

spring means urging said slidable first support plate towards said fixed second support plate, to maintain said desiccant material in compression,

and means allowing said slidable first support plate to move axially towards said second support plate in response to urging by said spring means, while preventing movement of said first support plate in the opposite axial direction,

to maintain the desiccant material in compression and reduce the generation of refrigerant contaminating dust caused by the attrition of the desiccant material when vibrated.

2. The drier of claim 1 wherein the first and second support plates are adjacent to the first and second ends, respectively, of the body member, and wherein the spring means is disposed between the first end of the body member and the first support plate.

3. The drier of claim 1 wherein the means which allows axial movement of the first support plate in only one axial direction is an annular metallic barbed disc, said metallic barbed disc having a plurality of circumferentially spaced barbs in contact with the inner wall and angled such that the barbs will slide on the inner wall when the barbed disc is urged in one axial direction, and such that the barbs will dig into the inner wall when the barbed disc is urged in the opposite axial direction.

4. The drier of claim 1 including first and second filter means disposed adjacent to the first and second support plates, respectively, between the first and second support plates and the desiccant material.

5. The drier of claim 4 including first and second wire screens respectively disposed between the first support plate and the first filter means, and between the second support plate and the second filter means.

6. The drier of claim 4 including first and second axially slidable annular sealing means respectively disposed between the first filter means and the desiccant material, and between the second filter means and the dessicant material, to prevent migration of the desiccant material through the interfaces between the first and second filter means and the inner wall of the body member.

7. The drier of claim 6 wherein the first and second annular sealing means are washer-shaped rings.

8. The drier of claim 1 wherein each of the first and second filter means includes a fiber cushion pad selected for durability disposed adjacent to the desiccant material and a fiberglas filter pad disposed adjacent to a support plate.

9. The drier of claim 8 wherein the fiber cushion pad includes fibers formed of polyester.

10. The drier of claim 8 wherein the fiber cushion pad is a wool felt.

11. The drier of claim 8 including first and second wire screens respectively disposed between the first support plate and the fiberglas filter of the first filter means, and between the second support plate and the fiberglas filter of the second filter means.