METHOD FOR CONTROLLING A CIRCULATION PUMP IN AN INSTALLATION COMPRISING AT LEAST TWO CIRCULATION CIRCUITS

• US 20150211528A1
• Filed: 09/02/2013
• Published: 07/30/2015
• Est. Priority Date: 09/12/2012
• Status: Active Grant

• Current Assignee: Grundfos Holding A/S (POUL DUE Jensen's FOND)
• Original Assignee: Grundfos Holding A/S (POUL DUE Jensen's FOND)
• Inventors: Dssing, Bent, Byskov Skafsgaard, Martin
• Granted Patent: US 10,900,490 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F04D 1/00 Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps adapted for pumping specific fluids F04D7/00; priming or boosting F04D9/00
• CPC Class Codes: F04D 13/06 the pump being electrically driven
• CPC Class Codes: F04D 15/0005 by using valves
• CPC Class Codes: F04D 15/0016 mixing-reversing- or deviation valves
• CPC Class Codes: F24D 19/1012 by regulating the speed of a pump
• CPC Class Codes: F24D 19/1024 a multiple way valve
• CPC Class Codes: F24D 19/1066 for the combination of central heating and domestic hot water
• CPC Class Codes: F24D 3/105 pumps combined with multiple way valves
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A method controls a circulation pump (1) in an installation with at least two circulation circuits (3, 4), with which the circulation pump (1) is integrated by way of a switch-over valve (2) into the one or the other circulation circuit (3 or 4) depending on the switched position. The pump (1) is activated differently depending on the switched position of the switch-over valve (2). The switch-over procedure is detected by way of determining the pressure course and/or the flow rate course in the pump (1) or an electrical variable which is dependent thereon, of the motor driving the pump, and the pump (1) is operated in another manner accordingly.

Claims

1. A method for controlling a circulation pump in an installation with at least two circulation circuits, with which the circulation pump is integrated by way of a switch-over valve into the one or another of the circulation circuits depending on a switched position, the method comprising the steps of:

activating the pump differently depending on the switched position of switch-over valve;

detecting a switch-over procedure by determining a pressure course and/or a flow rate course in the pump or an electrical variable which is dependent thereon, of the motor driving the pump; and

operating the pump in another manner upon detecting the switch-over procedure.

2. A method according to claim 1, wherein the switched position of the switch-over valve is detected by way of determining the pressure course and/or the flow rate course in the pump or an electrical variable of the motor which is dependent thereon.

3. A method according to claim 2, wherein the circulation pump is arranged in a heating installation with two heating circuits as the circulation circuits, one of the heating circuits being for service water heating and one of the heating circuits being for room heating, in which installation a primary heat exchanger is conductively connected to the one or the other heating circuit by way of a switch-over valve.

4. A method according to claim 1, wherein the pressure course and/or flow rate course in the pump or an electrical variable dependent thereon, of the motor, is continuously detected.

5. A method according to claim 1, wherein the switch-over procedure is determined by way of the pressure course and/or the flow rate course or of an electrical variable of the motor dependent thereon during the switch-over procedure and/or directly before and after the switch-over procedure.

6. A method according to claim 1, wherein the switched position is determined by way of the pressure course and/or the flow rate course and/or an electrical variable of the motor dependent thereon between temporally consecutive switch-over procedures.

7. A method according to claim 1, wherein the pressure course or flow rate course is compared with predefined characteristic values for the switch-over procedure/the switched position, and the switch/over procedure/the switched position is determined by way of the comparison.

8. A method according to claim 1, wherein the switched position is monitored by way of the pressure course or of the throughput course or of an electrical variable of the motor which is dependent thereon, and that a switch-over is carried out automatically in the control given a determining of a switched position which is different from that predefined in the control.

9. A method according to claim 1, wherein the switched position for service water heating is ascertained given temporally constant values.

10. A method according to claim 1, wherein the switched position for room heating is ascertained given temporally changing values.

11. A circulation pump assembly comprising:

a speed-controllable electric motor;

a centrifugal pump driven by the electric motor pump being integrated into an installation with one or the another of at least two circulation circuits by way of a switch-over valve depending on the a switched position for delivery into one circulation circuit; and

a control for the speed control of the motor, wherein the control takes the steps of;

activating the pump differently depending on the switched position of switch-over valve;

detecting a switch-over procedure by determining a pressure course and/or a flow rate course in the pump or an electrical variable which is dependent thereon, of the motor driving the pump; and

operating the pump in another manner upon detecting the switch-over procedure.

12. A circulation pump assembly according to claim 11, wherein the centrifugal pump is a heating circulation pump and that one circulation circuit is a heating circuit for the room heating, and the other circulation circuit is a heating circuit for the service water heating.

13. A circulation pump assembly according to claim 11, wherein the motor is speed-controlled and the control for the detection of the switch-over procedure forms part of control and regulation electronics of the speed controller, implemented into the control and regulation electronics with regard to software.

14. A circulation pump assembly according to claim 11, wherein the control monitors the flow rate course or electrical or hydraulic variables dependent thereon, in the regulated operating conditions as well as in the unregulated operating conditions of the pump.

15. A circulation pump assembly according to claim 11, wherein control and regulation electronics are provided, which carry out an automatic adaptation of a regulating curve to the installation.