Fluid cooling device

Details Fluid cooling device Fluid cooling device

1999-08-31

2001-09-18

Ryznic, John E. (Department: 3745)

Pumps

Motor driven

Interrelated or common lubricating or cooling means for pump...

C220S565000

Reexamination Certificate

active

06290473

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a fluid cooling device formed as modular unit with a motor driving a fan wheel and fluid pump. The fluid pump removes the fluid out of an oil reservoir and conveys it into a hydraulic work cycle. The work cycle heats the fluid and feeds it to a heat exchanger for cooling. From the heat exchanger, the cooled fluid returns into the oil reservoir.
BACKGROUND OF THE INVENTION
DE 44 00 487 A1 discloses fluid cooling devices, also called pneumatic coolers, incorporated as compact modular units in hydraulic or liquid circuits in plants or machines. The liquid cooling is generally dependent on the input temperature differential between liquid and ambient air, on flow volume and on the flow rate of the air. Heating problems arising as a result of multi-layered operation and higher air temperature could consequently be prevented. In order to be able to use such fluid cooling devices for hydraulic work cycles of greater magnitude, the oil reservoir must be enlarged to a correspondingly large-dimensioned volume.
DE 43 37 131 A1 involves a design of a hydraulic assembly, for the enlargement of the oil reservoir volume, including a hollow capsule around a motor and pump unit of the hydraulic assembly. This design clearly complicates the free passage, for example for assembly and maintenance purposes, from the exterior to the motor and pump unit of the hydraulic assembly.
SUMMARY OF THE INVENTION
Objects of the present invention are to improve the conventional fluid cooling devices by maintaining a compact construction while making a relatively large-volume liquid or oil reservoir available and being adaptable for maintenance and assembly.
The foregoing objects are basically obtained by a fluid cooling device formed as a modular unit, comprising a motor, a fan wheel coupled to the motor to be driven thereby, and a fluid pump coupled to the motor to be driven thereby. A trough-like oil reservoir has raised trough edges and forms a half shell at least partially surrounding the motor and the fluid pump. A fluid circuit connects the oil reservoir, the pump, a hydraulic work cycle connection and a heat exchanger such that fluid can be pumped from the oil reservoir to the hydraulic work cycle connection where the fluid is heated, and can be conveyed through the fluid circuit through the heat exchanger where the fluid is cooled before being returned to the oil reservoir.
A relatively large-volume modular oil reservoir is obtained which still saves space in a compact modular manner, and is a component part of the fluid cooling device. It at least partially surrounds parts of the cooling device while saving space. The structural space left open by the trough edges provides good accessibility for assembly and maintenance purposes for the motor and fluid pump.
In one preferred embodiment of the fluid cooling device according to the present invention, between the raised trough edges of the oil reservoir, a housing part is arranged holding the fan wheel and forming an air circulation shaft for the heat exchanger through which the fluid is conveyed. Preferably, in an extension of the housing part beneath the oil reservoir, a foot part is arranged. The foot part can be constructed in the shape of a shoe, enhancing the fastening of the device. The shoe sole has fastening flanges over at least a portion of the sole length extending outward. On the basis of this foot part, a space-saving, secure fastening of the entire fluid cooling device to stationary modular parts and housing walls is facilitated.
Through the shoe-like construction of the foot part, the resulting fastening demonstrates little vibration and the modular component parts fastened on the right and left of the housing part engage the fluid cooling device as a sort of a balance on the housing part, and consequently, on the foot part.
In addition to a compact construction for the fluid cooling device, the present invention uniformly distributes the material components of the cooling device so that during operation, even with corresponding characteristic movements and vibrations, a secure state can be attained because of the fastening shoe. Other measures traditionally used to obtain balance can be deleted, which also is favorable considering the aimed-for diminution of the modular dimensions.
Other objects, advantages and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention.


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