Parallel circulation pump coordinating control assembly

Patent metadata

Field	Value
Publication number	US-11371509-B2
Application number	US-201816490129-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Mar 3, 2017
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

A circulation pump assembly (22) includes an electrical drive motor (10) and an electronic control device (12) controlling the drive motor (10). The control device (12) is configured for the speed control of the drive motor (10) according to a control schema (I, II, III). The control device (12) includes a detection function (42) which is configured to detect a condition variable representing an operating condition, from a parallel flow path (16, 18, 20) with a second circulation pump assembly (22). The control device (12) is also configured such that it can change the control schema (I, II, III) on the basis of a condition variable detected by the detection function (42). Further an arrangement of at least two such circulation pump assemblies (22) and a method for the control of such two circulation pump assemblies (22) are provided.

First claim

The invention claimed is:

1. A circulation pump assembly comprising:
an electrical drive motor; and
an electronic control device for control of the drive motor, wherein the electronic control device is configured to regulate a speed of the drive motor according to a control schema and the electronic control device comprises a detection unit configured to detect a condition variable representing an operating condition, of a parallel flow path with a second circulation pump assembly associated with only a single individual hydraulic branch of a hydraulic system having a single hydraulic resistance active in the single hydraulic branch, and the electronic control device is configured to change the control schema on the basis of the condition variable detected by the detection unit such that a differential pressure across a hydraulic resistance in another individual hydraulic branch of the hydraulic system connected to an outlet side of the circulation pump assembly is retained on a predefined value.

2. A circulation pump assembly according to claim 1 , wherein the detection unit is configured to detect, as the condition variable a signal which represents the switching-on and/or switching-off or a speed change at least of a second circulation pump assembly, and the electronic control device is configured to control the drive motor whilst taking into account this detected signal.

3. A circulation pump assembly according to claim 2 , wherein the detection unit is configured to recognize a signal in a form of at least one predefined pattern of a hydraulic load acting upon the circulation pump assembly.

4. A circulation pump assembly according to claim 1 , wherein the electronic control device comprises a communication interface connected to the detection unit such that the detection unit receives a signal via the communication interface.

5. A circulation pump assembly according to claim 1 , wherein the electronic control device comprises a signal generating device configured to produce a signal which represents the switching-in and/or switching-off or a speed change of the drive motor.

6. A circulation pump assembly according to claim 5 , wherein the signal generating device is configured to produce a hydraulic signal.

7. A circulation pump assembly according to claim 1 , wherein the electronic control device comprises a communication interface which is connected to the signal generating device such that the signal generating device emits a signal or a value, via the communication interface.

8. A circulation pump assembly according to claim 7 , wherein the signal generating device is configured to output a delivery rate value representing the current delivery rate of the circulation pump assembly, via the communication interface.

9. A circulation pump assembly according to claim 8 , wherein the communication interface is configured for the communication connection with a communication interface of at least the second circulation pump assembly of the same type, the electronic control device is configured such that, via the communication interface and the detection function, the electronic control device receives the condition variable from at least the second circulation pump assembly of the same type via the communication interface of this second circulation pump assembly and that the electronic control device controls the drive motor whilst taking into account the condition variable received from the communication interface.

10. A circulation pump assembly according to claim 8 , wherein the communication interface is designed for communication with several second circulation pump assemblies of the same type, and the electronic control device controls the drive motor whilst taking into account all condition variables received from the communication interface.

11. A circulation pump assembly according to claim 1 , wherein the electronic control device is configured such that the control schema, according to which the drive motor is regulated, comprises a pump characteristic curve which is changed and shifted, in dependence on a signal which is recognized or received by the detection function, in dependence on a received condition variable.

12. A circulation pump assembly according to claim 11 , wherein the electronic control device is configured such that the pump characteristic curve is shifted by a correction value which represents a function of a received or detected condition variable.

13. A circulation pump assembly according to claim 1 , wherein the electronic control device is configured such that after receiving a signal from the detection function, the electronic control device automatically changes the control schema in dependence on the change of the hydraulic load and shifts a pump characteristic curve which forms the control schema.

14. A circulation pump assembly according to claim 1 , wherein the electronic control device is configured such that the electronic control device changes the control schema given a predefined condition variable which is detected by the detection function, such that the drive motor is switched off.

Assignees

• Grundfos Holding As

Inventors

• Blad Thomas

Classifications

• F04D13/12 Primary

  Combinations of two or more pumps (combinations with priming pumps or booster pumps to counteract vapour-lock F04D9/04) · CPC title

• F04D15/029

  for pumps operating in parallel · CPC title

• F04D13/06 Primary

  the pump being electrically driven · CPC title

• F04D15/0245

  responsive to a condition of the pump · CPC title

• F04D15/0281

  responsive to a condition not otherwise provided for · CPC title