Refrigeration – Structural installation – With electrical component cooling
Patent
1998-04-21
2000-03-28
Doerrler, William
Refrigeration
Structural installation
With electrical component cooling
62505, H05K 720, F25B 4100
Patent
active
060416092
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a hermetic cooling compressor with an electric motor having a variable speed controlled by a converter cooled by a cooling medium flow.
From U.S. Pat. No. 4,720,981 it is known to cool control electronics for a compressor with cooling medium by letting the fluid between capacitor and evaporator flow through a cooling plate.
This will keep the temperature of the cooling plate constant, as the fluid flow can cool or heat as required.
U.S. Pat. No. 5,220,809 describes the cooling of system electronics for automobile air-conditioning, in which the cooling medium is led to a cooling block, on which the system electronics unit is mounted, in parallel with throttling device and evaporator. The cooling block has its own throttling device at the inlet, and the outlet is connected to the suction pipe of the compressor. The cooling block acts as an evaporator connected in parallel.
U.S. Pat. No. 5,012,656 describes how electronic components are fixed to the outside of an evaporator, through the inside of which the air to be cooled is flowing, before it is led to the inside of the car.
In all three described methods for cooling the electronic unit will be placed relatively far from the cooling compressor. This will involve the use of long cables with a great risk of radiated interference disturbing the surroundings. The electronic circuit will be cooled by gas having approximately the same temperature as the surroundings. Thus the electronic components will have a high operation temperature, resulting in a reduced lifetime.
The purpose of the invention is to present cooling of an electronic circuit, which is built together with a hermetic compressor.
The task set can be solved by means of a cooling compressor as described in the introduction, if compressor and converter are built together in one unit, in which a medium flowing through said unit is used for the cooling of the electronic circuit of the converter.
This will give a compact design, in which the size of the electronic circuit is determined by the components and not by demands for cooling plates for the cooling of power electronics. Simultaneously, forced air cooling can be avoided. A cable between control electronics and compressor can be completely avoided by direct connection to the connection terminals of the compressor. Thus high frequency interference can be eliminated efficiently.
The invention can be realised through utilisation of the suction gas of the compressor for cooling of the electronic circuit. This will cause a low working temperature for the electronic circuit, thus increasing the lifetime of the electronic components.
The oil of the compressor can be used for cooling of the electronic circuit. This will give an efficient cooling, which also helps increasing the oil temperature in order to avoid absorption of the cooling medium. Future compressors will be energy-optimised to a degree, which will prevent them from reaching an ideal oil temperature during normal operation.
The electronic circuit can be mounted on a heat conducting plate having a heat conducting connection with the compressor shell, cooled with oil inside the compressor. Thus a good distribution of the induced heat to the whole compressor housing is obtained, said compressor housing thus acting as common cooling plate.
The electronic circuit can be mounted on a heat conducting plate having a heat conducting connection to the compressor shell in an area, in which the compressor shell is cooled by the entry of the suction pipe branch. This results in cooling with suction gas without interference with the suction gas connection.
The electronic circuit can be mounted externally on the compressor in connection with a cable entry of the compressor shell, where the electronic circuit is mounted on a heat conducting plate having a channel through which cooling medium is flowing. This gives a cooling to approximately the same temperature as that of the evaporator.
With advantage, the electronic circuit can control the superheating of the suction gas in dependenc
REFERENCES:
patent: 3903710 (1975-09-01), Quatman
patent: 4047242 (1977-09-01), Jakob et al.
patent: 4720981 (1988-01-01), Helt et al.
patent: 5012656 (1991-05-01), Tamura
patent: 5220809 (1993-06-01), Voss
patent: 5350039 (1994-09-01), Voss et al.
Holst J.o slashed.rgen
Hornsleth Steen
Simonsen Jens
Danfoss A/S
Doerrler William
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