Claims
- 1. A filter-drier unit for heat pump systems, comprising:
- (a) a housing provided with an inlet and outlet,
- (b) desiccant in the housing between the inlet and outlet,
- (c) flow-directing means including:
- 1. a fine mesh screen in the housing between the inlet and desiccant for enabling a first flow from the inlet through the screen and desiccant,
- 2. a passage bypassing the desiccant for enabling a second flow from the inlet through the passage, and
- 3. the fine mesh screen collecting desiccant fines upon any reverse flow for precluding migration of desiccant out of the inlet,
- (d) the fine mesh screen is located relative to the inlet and bypass passage so that the second flow engages and moves past the screen for washing the screen and passing any dirt from the screen into and through the bypass passage,
- (e) a filter means is located in the housing between the desiccant and outlet for receiving the first flow through the desiccant and for receiving the second flow including any dirt washed from the screen from the bypass passage prior to movement through the outlet, the bypass passage enabling reverse flow from the filter means to the inlet,
- (f) a holder containing the desiccant, the holder being spaced peripherally from the housing to provide the bypass passage therebetween,
- (g) the fine mesh screen extends across the holder upstream of the desiccant and is spaced axially from the inlet to provide a space between the inlet and screen, and
- (h) the bypass passage communicates with the space between the inlet and screen so that the second flow engages and moves past the screen for washing the screen.
CROSS-RELATED APPLICATIONS
This application is a continuation-in-part of copending application Ser. No. 789,360, filed on Apr. 21, 1977, now U.S. Pat. No. 4,104,044 which is a continuation-in-part of application Ser. No. 729,670, filed on Oct. 5, 1976, now U.S. Pat. No. 4,029,580 that was copending with U.S. Pat. No. 4,029,580.
US Referenced Citations (11)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
789360 |
Apr 1977 |
|
Parent |
729670 |
Oct 1976 |
|