Electric fluid pump

Patent metadata

Field	Value
Publication number	US-9366259-B2
Application number	US-201314096707-A
Country	US
Kind code	B2
Filing date	Dec 4, 2013
Priority date	Dec 5, 2012
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

An electric fluid pump may include a wet section having a pump wheel and a permanently excited rotor of an electric motor arranged therein. The electric fluid pump may include a dry section having a stator of the electric motor arranged therein. A containment shell may be included configured to separate the wet section from the dry section. The dry section may include control electronics for controlling the fluid pump. The control electronics may connect in a heat-transferring manner to the containment shell and the wet section via the containment shell.

First claim

The invention claimed is:

1. An electric fluid pump, comprising:
a wet section having a pump wheel and a permanently excited rotor of an electric motor arranged therein;
a dry section having a stator of the electric motor arranged therein; and
a containment shell configured to separate the wet section from the dry section;
wherein the dry section includes control electronics for controlling the fluid pump, the control electronics connected in a heat-transferring connection to the containment shell and the wet section via the containment shell; and
wherein at least one of:
the containment shell includes a metal insert part disposed in a region of the heat-transferring connection, wherein the metal insert part is embedded in a material of the containment shell, the metal insert part in heat conducting contact with the control electronics and the wet section, and wherein the metal insert part has a greater thermal conductivity than the material of the containment shell disposed away from the heat-transferring connection; and
the containment shell is configured as a tubular cylinder, wherein an end of the tubular cylinder is closed off by a cover disc disposed in a region of the heat-transferring connection, and wherein the cover disc is composed of a plastic having particles embedded therein, wherein the particles have a greater thermal conductivity than the plastic.

2. The fluid pump according to claim 1 , wherein the fluid pump is configured as a coolant pump.

3. The fluid pump according to claim 1 , wherein at least one of
the containment shell includes a metal, and
the containment shell is composed of a plastic including particles embedded therein, the particles having a greater thermal conductivity than that of the plastic of the containment shell for improved heat conduction.

4. The fluid pump according to claim 1 , wherein the control electronics comprise a circuit board having at least two power semi-conductors mounted thereon, and wherein the at least two power semi-conductors are arranged on a side of the circuit board facing away from the containment shell.

5. The fluid pump according to claim 4 , wherein the circuit board is connected to the containment shell via thermally conductive platelets disposed at the heat-transferring connection, and wherein the platelets are connected in a heat-transferring manner to the at least two power semi-conductors through the circuit board via thermal conductors.

6. The fluid pump according to claim 1 , wherein the containment shell includes the metal insert part, and
the material of the containment shell comprises a plastic, wherein the metal insert part is embedded in the plastic of the containment shell.

7. The fluid pump according to claim 1 , wherein the containment shell configured as the tubular cylinder is composed of a plastic, and wherein at least one of:
the cover disc comprises a metal, and
the cover disc comprises a plastic.

8. The fluid pump according to claim 1 , wherein the containment shell includes a point of support for mounting at least one of the rotor and a shaft of the electric motor.

9. The fluid pump according to claim 8 , wherein the point of support is arranged in the cover disc.

10. The fluid pump according to claim 3 , wherein the control electronics includes a circuit board having at least two power semi-conductors mounted thereon, and wherein the at least two power semi-conductors are arranged on a side of the circuit board facing away from the containment shell.

11. The fluid pump according to claim 10 , wherein the circuit board connects to the containment shell via thermally conductive platelets disposed at the heat-transferring connection, wherein the platelets are connected in a heat-transferring manner to the at least two power semi-conductors through the circuit board via thermal conductors.

12. The fluid pump according to claim 1 , wherein the containment shell configured as the tubular cylinder is composed of a plastic.

13. The fluid pump according to claim 12 , wherein the cover disc is comprised of plastic, and wherein the cover disc has a wall thickness thinner than a wall thickness of the containment shell.

14. The fluid pump according to claim 12 , wherein the cover disc is composed of the plastic including particles embedded therein, wherein the particles have better thermal conductivity than the plastic.

15. The fluid pump according to claim 5 , wherein the containment shell includes a plurality of metal insert parts each in heat conducting contact with at least one of the thermally conductive platelets.

16. The fluid pump according to claim 1 , wherein the containment shell configured as the tubular cylinder includes the cover disc composed of the plastic having particles embedded therein, and wherein the particles include ceramic particles.

17. The fluid pump according to claim 16 , wherein the ceramic particles include boron nitride.

18. The fluid pump according to claim 1 , wherein the containment shell is composed of a plastic including particles embedded therein, and wherein the particles include ceramic particles.

19. The fluid pump according to claim 9 , further comprising a sealing element engaging the point of support of the cover disc, wherein the sealing element is disposed between the cover disc and the containment shell.

20. An electric fluid pump, comprising:
a wet section having a pump wheel and a permanently excited rotor of an electric motor arranged therein;
a dry section having a stator of the electric motor arranged therein; and
a containment shell configured to separate the wet section from the dry section;
wherein the dry section includes control electronics for controlling the fluid pump, the control electronics connected in a heat-transferring manner to the containment shell and the wet section via the containment shell;
wherein the containment shell is configured as a tubular plastic cylinder and includes a point of support for mounting at least one of the rotor and a shaft of the electric motor, the point of support being held via at least one web on the tubular plastic cylinder, and wherein an end of the tubular plastic cylinder including the at least one web is engaged about and closed off by a metal cover disc.

Assignees

• Mahle Int Gmbh

Inventors

• Binder Tobias
• Cramme Markus
• Elsaesser Alfred
• Fritz Oliver
• Gommel Achim
• Krappel Michael
• Weber Stephan

Classifications

• F04D13/064 Primary

  Details of the magnetic circuit · CPC title

• F04D29/5813

  Cooling the control unit · CPC title