Safety vacuum release system

• US 9,726,184 B2
• Filed: 12/03/2013
• Issued: 08/08/2017
• Est. Priority Date: 10/06/2008
• Status: Active Grant

• Current Assignee: Danfoss Power Electronics A/S (Danfoss A/S), Pentair Water Pool And Spa Incorporated (Pentair Plc (Ireland))
• Original Assignee: Danfoss Drives A/S (Danfoss A/S), Pentair Water Pool And Spa Incorporated (Pentair Plc (Ireland))
• Inventors: Stiles, Jr., Robert W., Berthelsen, Lars Hoffmann
• Primary Examiner(s): Freay, Charles
• Application Number:
  US14/095,911
• Publication Number:
  US 20140205465A1
• Time in Patent Office: 1,344 Days
• Field of Search: 417 26, 417 4411, 417 53, 417509
• CPC Class Codes: E04H 4/1209 Treatment of water for swimming pools filters B01D
• CPC Class Codes: E04H 4/1245 Recirculating pumps for swimming pool water
• CPC Class Codes: E04H 4/16 specially adapted for cleaning
• CPC Class Codes: F04B 2203/0201 Current
• CPC Class Codes: F04B 2203/0202 Voltage
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 49/10 Other safety measures
• CPC Class Codes: F04B 49/106 Responsive to pumped volume

Abstract

Some embodiments of the invention provide a pumping system for at least one aquatic application. The pumping system includes a pump, a motor coupled to the pump, a user interface associated with the pump designed to receive input instructions from a user, and a controller in communication with the motor. The controller determines a power parameter associated with the motor and compares the power parameter to a predetermined threshold value. The controller triggers a safety vacuum release system based on the comparison of the power parameter and the threshold value.

Claims

1. A pumping system for at least one aquatic application, the pumping system comprising:

a pump;

a motor coupled to the pump;

a user interface associated with the pump designed to receive input instructions from a user;

and

a controller in communication with the motor,

the controller determining a power parameter associated with the motor,

the controller comparing the power parameter to a predetermined threshold value, and

the controller triggering a safety vacuum release system based on the comparison of the power parameter and the threshold value;

wherein the power parameter is a relative power consumption value of a motor.

2. The pumping system of claim 1, wherein the power parameter is calculated by taking a difference between a current power consumption value and a lagged power consumption value and dividing the difference by the current power consumption value.

3. The pumping system of claim 1, wherein the controller operates the pump according to at least one schedule.

4. The pumping system of claim 1 further including an external controller having a plurality of buttons to allow operation of the system from a remote location.

5. The pumping system of claim 1, wherein the controller will automatically restart the pump after an obstructed inlet has been detected and the pump has been stopped.

6. The pumping system of claim 1 further including a dynamic counter that is increased or decreased based on power variations.

7. The pumping system of claim 6, wherein the controller detects when the dynamic counter has increased beyond a threshold value and deactivates the pump when the threshold value has been exceeded.

8. The pumping system of claim 6, wherein the controller triggers the safety vacuum release system based on the comparison of the power parameter being above a negative threshold and a value of the dynamic counter exceeding a positive threshold.

9. A safety vacuum release system for at least one aquatic application, the safety vacuum release system comprising:

a pump including an inlet;

a motor coupled to the pump; and

a controller in communication with the motor,

the controller designed to detect if an obstruction is present in the inlet based on a relative power consumption value of the motor.

10. The pumping system of claim 9, wherein the controller determines an actual power consumption measurement of the motor and filters the actual power consumption measurement to obtain a current power consumption value.

11. The pumping system of claim 10, wherein the actual power consumption value and the current power consumption value are compared to values associated with a power curve.

12. The pumping system of claim 9 further including a counter that includes a threshold value that triggers an obstruction condition.

13. The pumping system of claim 12, wherein an obstruction condition is triggered and a safety vacuum release system is activated when the threshold value is exceeded.

14. A safety vacuum release system for at least one aquatic application, the safety vacuum release system comprising:

a pump including an inlet;

a motor coupled to the pump;

a detached controller designed to operate the pump; and

an on-board controller in communication with the motor,

the on-board controller designed to detect if an obstruction is present in the inlet based on a relative power consumption value of the motor.

15. The safety vacuum release system of claim 14 further including an automatic restart setting that provides a time period before the on-board controller will resume normal operation of the pump after an obstructed inlet has been detected and the pump has been stopped.

16. The safety vacuum release system of claim 14, wherein the on-board controller stores a plurality of motor speeds associated with a plurality of corresponding schedules.

17. The safety vacuum release system of claim 14, wherein the power relative power consumption value is calculated by taking a difference between a current power consumption value and a lagged power consumption value and dividing the difference by the current power consumption value.

18. The safety vacuum release system of claim 14, wherein the controller compares the relative power consumption value to a predetermined threshold value and the controller triggers the safety vacuum release system based on a comparison of the relative power consumption value being above a negative threshold.