Integrated controller pump

• US 6,065,946 A
• Filed: 07/03/1997
• Issued: 05/23/2000
• Est. Priority Date: 07/03/1997
• Status: Expired due to Fees

• Current Assignee: Leslie Hoffman
• Original Assignee: ResMed Motor Technologies, Inc.
• Inventors: Lathrop, Raymond D.
• Primary Examiner(s): Thorpe, Timothy S.
• Assistant Examiner(s): TYLER, CHERYL JACKSON
• Application Number:
  US08/887,535
• Time in Patent Office: 1,055 Days
• Field of Search: 417/17, 417/32, 417/42, 417/44.1, 417/423.7, 417/423.14, 310/43, 310/45
• US Class Current: 417/423.14
• CPC Class Codes: F04B 2203/0209 Rotational speed
• CPC Class Codes: F04B 2207/03 External temperature
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04D 13/0606 Canned motor pumps
• CPC Class Codes: F04D 13/0686 Mechanical details of the pump control unit pump control F04D15/00
• CPC Class Codes: F04D 15/0066 by changing the speed, e.g. of the driving engine
• CPC Class Codes: F24D 19/1012 by regulating the speed of a pump
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 2211/03 Machines characterised by circuit boards, e.g. pcb
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence
• CPC Class Codes: H02K 5/12 specially adapted for operating in liquid or gas combined with cooling arrangements H02K9/00
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A d.c. controller pump includes electronic control mechanisms that permit regulated control within a fluid flow system. A pump head is coupled to a housing allowing the fluid to infiltrate the region surrounding a permanent magnet rotor. Stator windings and control electronics fixed to a plurality of printed circuit boards are isolated from the fluid by means of a solid body that encapsulates the stator windings and seals the rear of the cavity. Hall effect sensor-generators and other assemblies are fixed within the solid body to enhance integrity and reduce parts count. Associated electronics includes a readily-removable circuit board for housing auxiliary electronic functions. The board is mounted in parallel at the rear of the pump housing with boards of sensor and controller electronics. The auxiliary function electronics pump configurations enable both fixed and variable speed operation in accordance with fluid flow system design and parameters.

Claims

1. A centrifugal integrated d.c. controller pump comprising, in combination:

a) a pump head having spaced-apart inlet and outlet ports and an impeller for controlling a flow of fluid therebetween;

b) an integral solid body of continuous molded, nonmagnetic material having a generally-cylindrical shape and a hollow interior, said body encapsulating a stator;

c) a rotor fixed to said means for controlling fluid flow, said rotor including a plurality of radially-arrayed permanent magnets;

d) the hollow interior of said solid body of molded, nonmagnetic material defining a coaxial interior cylindrical chamber permanently closed at one end and open at the opposed end for receiving said rotor;

e) a hollow cylindrical housing; and

f) the exterior surface of said body contacting the interior surface of said housing throughout the length of said body.

2. A pump as recited in claim 1 wherein said stator further includes:

a) a plurality of windings; and

b) said windings are arranged adjacent the surface of said interior cylindrical chamber.

3. A pump as recited in claim 1 wherein said solid body is of molded EPOXY fabrication.

4. A pump as recited in claim 1 further comprising:

a) at least one board having electronic circuitry mounted thereon;

b) said at least one board being located within a rear section of said housing; and

c) the closed end of said solid body being intermediate said pump head and said at least one board.

5. A pump as recited in claim 4 further comprising:

a) a plurality of circuit boards including an auxiliary board located within said rear section of said housing;

b) said auxiliary circuit board including electronic circuitry functionally limited to generating a signal for adjusting the speed of said pump in accordance with a predetermined protocol to thereby selectively vary the flow rate output of said pump; and

c) a removable end cap for fixation to and closure of the rear of said housing; and

d) said auxiliary circuit board being located adjacent said end cap to facilitate reconfiguration of operation of said pump.

6. A pump as recited in claim 5 wherein said boards are mounted in parallel to one another within said rear section of said housing.

7. A pump as recited in claim 1 further including a plurality of rotor motion sensors fixed within said solid body.

8. An integrated d.c. controller pump comprising, in combination:

a) a pump head having spaced-apart inlet and outlet ports and an impeller for controlling a flow of fluid therebetween;

b) a substantially cylindrical rotor fixed to said impeller, said rotor including a plurality of radially-arrayed permanent magnets;

c) a stator including a plurality of windings, said stator being coaxial with the cylindrical surface of said rotor;

d) a programmable microcontroller for receiving output signals from said rotor and said stator windings;

e) means for sensing at least one environmental variable and providing a responsive signal to said microcontroller;

f) means for inputting a predetermined operational protocol to program said microcontroller; and

g) said microcontroller being programmed to generate a pump flow rate and corresponding signal in response to said output and environmental variable signals for adjusting the speed of rotation of said rotor in accordance with said flow rate.

9. A pump as recited in claim 8 further including:

a) a cylindrical housing;

b) a plurality of circuit boards including an auxiliary circuit board;

c) said microcontroller and said means for inputting being fixed to said auxiliary circuit board;

d) said auxiliary circuit board being located at the end of said housing remote from said pump head; and

e) said other at least one circuit board including apparatus for constant rotor speed operation.

10. An integrated d.c. controller pump as defined in claim 8 further including:

a) an integral solid body of continuous molded, nonmagnetic material having a generally-cylindrical shape and a hollow interior, said body encapsulating said stator;

b) the hollow interior of said solid body of molded, nonmagnetic material defining a coaxial interior cylindrical chamber permanently closed at one end and open at the opposed end for receiving said rotor;

c) a hollow cylindrical housing; and

d) the exterior surface of said body contacting the interior surface of said housing throughout the length of said body.

11. A pump as recited in claim 8 wherein said d.c. signal is applied to said plurality of stator windings.

12. A pump as recited in claim 11 further including:

a) a plurality of Hall effect generators for sensing angular rotor position; and

b) said generators provide one of said output signals.

13. A pump as recited in claim 12 wherein said means for inputting a predetermined operational protocol to said microcontroller comprises at least one potentiometer.

14. A pump as recited in claim 13 further including:

a) a closed cylindrical solid body of molded nonconductive material having an interior cylindrical chamber; and

b) said stator windings being encapsulated within said solid body.

15. A pump as defined in claim l4 wherein said windings are arrayed radially adjacent the surface of said interior cylindrical chamber.

16. A pump as defined in claim 15 wherein said generators are fixed within said solid body.

17. In a radiant heating system of the type that includes a boiler for heating fluid within a first closed conduit defining a primary heating circuit, a second closed conduit defining a secondary heating circuit including at least one radiant heating panel, a third conduit defining a fluid flow path between said primary and secondary heating circuits and means for sensing at least one environmental variable, the improvement comprising, in combination:

a) a variable speed d.c. pump located within said third conduit for regulating the rate of flow of fluid from said primary heating circuit into said secondary heating circuit;

b) said d.c. pump including a rotor and at least one stator winding arranged to induce rotation thereof;

c) means for regulating the flow of fluid through said pump fixed to said rotor;

d) means for sensing the speed of said rotor; and

e) said pump further including (i) a microcontroller for receiving signals responsive to said speed of rotation and said at least one environmental variable, (ii) at least one potentiometer for inputting an evaluation criterion and (iii) said microcontroller being arranged to calculate a flow rate in response to said signals and said evaluation criterion and to generate a control signal in response to said calculated flow rate for application to said windings to adjust the speed of rotation of said rotor to thereby obtain said flow rate.

18. A radiant heating system as recited in claim 17 further characterized in that

said means for sensing comprises a plurality of Hall effect generators.

19. A radiant heating system as recited in claim 18 wherein at least one thermistor provides said signal responsive to at least one environmental variable.

20. A radiant heating system as recited in claim 19 further including:

a) a pump housing having a rear section;

b) a plurality of circuit boards including an auxiliary circuit board located within said rear section of said housing;

c) said plurality of potentiometers, said microcontroller and said means for receiving being fixed to said auxiliary function circuit board; and

d) said auxiliary circuit board being removably fixed within said rear section of said housing adjacent the end thereof to facilitate reconfiguration of operation of said pump.

21. A radiant heating system as recited in claim 19 including a first potentiometer for selectively inputting the selection of one of a fixed or an exterior-temperature dependent temperature profile for fluid within said secondary heating circuit.

22. A radiant heating system as defined in claim 17 wherein said pump further includes:

a) a pump head having spaced-apart inlet and outlet ports and an impeller for controlling a flow of fluid therebetween;

b) an internal solid body of continuous molded, nonmagnetic material having a generally-cylindrical shape and a hollow interior, said body encapsulating said stator;

c) said rotor being fixed to said impeller and including a plurality of radially-arrayed permanent magnets;

d) the hollow interior of said body of molded, nonmagnetic material defining a coaxial interior cylindrical chamber permanently closed at one end and open at the opposed end for receiving said rotor;

e) a hollow cylindrical housing; and

f) the exterior surface of said body contacting the interior surface of said housing throughout the length of said body.

23. In a closed multistation fluid flow system of the type that includes a plurality of lines joined to common return and feed lines and in which a predetermined total flow rate is apportioned between said plurality of lines with a maximum rate associated with each of said lines, the improvement comprising, in combination:

a) a variable speed d.c. pump located within each of said plurality of lines for regulating the rate of flow of fluid therein;

b) each of said d.c. pumps including a rotor and at least one stator winding arranged to induce rotation thereof;

c) means for regulating the flow of fluid through said pump fixed to said rotor;

d) means for sensing the speed of said rotor and the value of current flow within said at least one stator winding; and

e) each of said pumps including (i) a microcontroller for receiving said sensed values of speed of rotation and stator current, (ii) means for inputting the value of said maximum flow rate to said microcontroller and (iii) said microcontroller being arranged to calculate a flow rate in response to said inputs and to generate a d.c. control signal in response for application to said stator windings so that the speed of said rotor is continuously adjustable to thereby vary the flow rate output of said pump in response to flow conditions throughout said fluid flow system.

24. A multistation fluid flow system as recited in claim 23 wherein said means for inputting the value of said maximum flow rate is a potentiometer.

25. A multistation fluid flow system as recited in claim 24 further characterized in that said potentiometer and said microcontroller are fixed to a removable auxiliary circuit board.

26. A multistation fluid flow system as recited in claim 25 wherein said d.c. pump further comprises:

a) a housing having a rear section; and

b) said auxiliary circuit board is located within said rear section of said pump housing adjacent the end of said housing to facilitate reconfiguration of operation of said pump.

27. A multistation fluid flow system as defined in claim 23 wherein each of said pumps further includes:

a) a pump head having spaced-apart inlet and outlet ports and an impeller for controlling a flow of fluid therebetween;

b) an integral solid body of continuous molded, nonmagnetic material having a generally-cylindrical shape and a hollow interior, said body encapsulating said stator;

c) said rotor being fixed to said impeller and including a plurality of radially-arrayed permanent magnets;

d) the hollow interior of said solid body of molded, nonmagnetic material defining a coaxial interior cylindrical chamber permanently closed at one end and open at the opposed end for receiving said rotor;

e) a hollow cylindrical housing; and

f) the exterior surface of said body contacting the interior surface of said housing throughout the length of said body.

28. In a radiant heating system of the type that includes a boiler for heating fluid within a first closed conduit defining a primary heating circuit, a second closed conduit defining a secondary heating circuit including at least one radiant heating panel, a third conduit defining a fluid flow path between said primary and secondary heating circuits and means for sensing at least one environmental variable, the improvement comprising, in combination:

a) a variable speed d.c. pump located within said third conduit for regulating the flow of fluid from said primary heating circuit into said secondary heating circuit;

b) said d.c. pump including a rotor and at least one stator winding arranged to induce rotation thereof;

c) means for regulating the flow of fluid through said pump fixed to said rotor;

d) a plurality of Hall effect generators for sensing the speed of said rotor; and

e) said pump further including (i) at least one thermistor for sensing the value of said at least one predetermined environmental variable, (ii) a plurality of potentiometers for inputting an evaluation criterion including a first potentiometer for selectively inputting the selection of either a fixed or an exterior temperature-dependent profile for fluid within said secondary heating circuit, a second potentiometer for inputting a predetermined minimum temperature of fluid flow within said primary heating circuit and a third potentiometer for inputting a selected exterior temperature-dependent heating profile for fluid within said secondary heating circuit (iii) a microcontroller for receiving said values and said evaluation criterion and generating a d.c. control signal in response thereto for application to said windings so that the speed of rotation of said rotor is continuously adjustable to thereby vary the flow rate output of said pump in response to said at least one sensed value and evaluation criterion;

(iv) a pump housing;

(v) a plurality of circuit boards located within said pump housing; and

(vi) said plurality of potentiometers and said microcontroller being fixed to a circuit board.