Swimming pool filtering system

• US 4,421,643 A
• Filed: 09/29/1978
• Issued: 12/20/1983
• Est. Priority Date: 10/30/1975
• Status: Expired due to Term

• Current Assignee: ITT Corporation (ITT, Inc.)
• Original Assignee: International Telephone & Telegraph Corp. (ITT, Inc.)
• Inventors: Frederick, Stanley H.
• Primary Examiner(s): Hruskoci, Peter A.
• Application Number:
  US05/946,979
• Time in Patent Office: 1,908 Days
• Field of Search: 210/169, 210/416.2, 210/65, 210/138, 318/224, 318/225, 318/340, 417/410, 417/12, 417/372, 310/66, 4/172.17
• US Class Current: 210/138
• CPC Class Codes: E04H 4/1245 Recirculating pumps for swimming pool water

Abstract

A swimming pool filtering system of the closed recirculatory type having a series connected strainer, pump and filter is provided with a close coupled pump drive motor having two sets of stator windings for allowing the selection of one of two water circulation rates to achieve more efficient pool water maintenance. A specific circulation rate may be manually selected or periods of selected circulation rates may be automatically programmed using a motor stator that is energized through a timer. Reduced pump speed during periods of little or no use results in substantial energy savings and a reduction of noise pollution during evening hours.

Claims

1. A swimming pool filter system, comprising:

a closed water circulating system having an inlet for receiving water from said pool and an outlet for discharging water into said pool at a point below the normal water level;

a filter connected in said closed water circulating system for filtering pool water, said filter and closed water circulating system defining a variable system head curve dependent upon the particular condition of said filter when said water circulating system is primed with water;

a centrifugal liquid pump connected in said closed water circulating system;

a motor closely coupled to said pump, said motor being capable of operating at at least two speeds for driving said pump to produce at least two different pool water circulation rates through said water circulating system in accordance with the instantaneous system head curve for a water primed system, one of said motor speeds being sufficiently high to produce a head that will prime the water circulating system, the other of said motor speeds being lower than said one speed and sufficient to provide a low water circulation rate through said water circulating system but not to prime said system; and

switch means for selecting a motor speed to thereby achieve a water circulation rate in accordance with the system head curve so that the most efficient circulation rate required to maintain a desired degree of pool water clarity may be selected thereby providing a more efficient filter system and for selecting said one speed when the water circulating system must be primed.

2. A swimming pool filter system as described in claim 1, additionally comprising a water-heater means disposed in said circulating system.

3. A swimming pool filter system as described in claim 1, wherein said motor includes a dual stator winding which may be selectively energized by said switch means to provide said two motor speeds.

4. A swimming pool filter system as described in claim 1, wherein the switch means includes a timer means for automatically selecting preset motor speeds during selected periods of time.

5. A swimming pool filter system as described in claim 1, wherein one of said two motor speeds is approximately one-half of the other motor speed.

6. A swimming pool filter system as described in claim 5, wherein the motor speeds are nominally 3500 RPM and 1750 RPM.