Gas separation: apparatus – With sound damping means – Sound attenuating gas flow path
Reexamination Certificate
1999-03-12
2001-01-09
Smith, Duane (Department: 1724)
Gas separation: apparatus
With sound damping means
Sound attenuating gas flow path
C055S385300, C055S443000, C055S444000, C055S445000, C096S383000, C096S384000
Reexamination Certificate
active
06171380
ABSTRACT:
BACKGROUND OF THE INVENTION
The miniaturization of electronic components has permitted the reduction of the volume requirements for control structures. While the miniaturization is normally accompanied with a reduced heat load, cooling of the electronic components is still normally required. The compactness permitted by miniaturization can complicate the cooling process. Additionally, the control structures can be located in conjunction with other structures which are located so as to minimize space requirements.
Transport refrigeration equipment, for example, must be located between the cab of the truck and the trailer while permitting the necessary relative movement between the truck and trailer. The refrigeration equipment must be external to the trailer so as to avoid reducing the cargo volume available and must present a streamlined profile to minimize wind resistance. Superimposed upon this is the need to provide more cooling capacity within the available space as trailer lengths and therefore the cooling requirements increase. It is desirable to locate the electronic controls in proximity to the devices being controlled such as valves, clutches, and motors in order to reduce the length, and cost, of the connecting electric harness. In placing such electronic controls near the devices being controlled, they are often placed in a harsh, high temperature environment, such as the engine compartment of a refrigeration unit, as well as near heat sources such as engines and compressors which may cause temperatures to exceed the allowable limits for the electronic controls.
SUMMARY OF THE INVENTION
A transport refrigeration unit is, typically, driven by a diesel engine. As is conventional for internal combustion engines, ambient air is drawn through a filter into the cylinders of the engine. The present invention uses the filtered air to provide the necessary cooling to the electronic components of the control structure. The electronic components may be mounted on heat sink structure which is in heat transfer contact with the filtered air being drawn into the diesel engine. The electronic components can also be located in a box, or the like, sealed from the ambient environment. An enhanced heat transfer surface can be located inside and/or outside the control box. An enhanced heat transfer surface will normally be located in the region of attachment of the control box/electronic components to the partition separating the box from the plenum/cavity or may form the partition. The plenum/cavity, in addition to providing a flow path conducive to heat transfer between the electronic components and the air being supplied to the engine, may also function as an attenuator for sound reduction.
It is an object of this invention to provide cooling to electronic components.
It is another object of this invention to use ambient air being drawn into an engine to cool electronic components.
It is a further object of this invention to incorporate a heat sink into an acoustic attenuator. These objects, and others as will become apparent hereinafter, are accomplished by the present invention.
Basically, the air drawn into a diesel engine serially passes through a filter and a cavity, such as a plenum, which acts as an acoustic attenuator, before being supplied to the cylinders of the diesel engine. In the cavity the air is in a heat transfer relationship with a heat sink for the electronic components of a microprocessor control. The electronic components may be located in the plenum cavity or in a separate chamber but must have a heat transfer relationship with the cavity, such as through a common wall on which the electronic components are mounted. A heat sink may extend into the cavity.
REFERENCES:
patent: 3276202 (1966-10-01), Gary
patent: 3559760 (1971-02-01), Ninomiya
patent: 4425145 (1984-01-01), Reese
patent: 4628689 (1986-12-01), Jourdan
patent: 5000768 (1991-03-01), Hwang
patent: 5912368 (1999-06-01), Satarino et al.
Lare, Jr. Walter E.
Lavrich Philip L.
Marks Patrick C.
Taras Michael F.
Wood Richard J.
Carrier Corporation
Pham Minh-Chau T.
Smith Duane
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