# US 4,399,484 A · Integral electric module and assembly jet cooling system

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- Number: US 4,399,484 A
- Document ID: US4399484A
- Status: Granted
- Kind: A
- Application number: 06/242,502
- Filed: 1981-03-10
- Granted: 1983-08-16
- Earliest claimed: 1981-03-10
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Inventors: Arnold H. Mayer
- Web page: https://patentgrep.com/patent/US4399484A

## CPC

- H05K 7/20554: {Forced ventilation of a gaseous coolant (in closed loop H05K7/206 or H05K7/20609 or H05K7/20618)}
- H05K 7/20345: {Sprayers; Atomizers}
- Y10S 165/908: Fluid jets
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An improved printed circuit board housing assembly is described wherein localized high intensity cooling of heat dissipating electronic components mounted on the circuit boards may be accomplished by direct impingement of streams of fluid coolant onto individual components; when coolant is passed through the housing, fluid streams, generated at openings provided in the circuit boards, impinge onto electronic components mounted on the next circuit board downstream from the source of coolant flow.

## Claims

### Claim 1

An improved electronics cooling system comprising:
a. a housing having an inlet at one end thereof and an outlet at a second end thereof for passage of fluid coolant therethrough;
b. holding means for maintaining a plurality of printed circuit boards in a spaced and generally parallel array within said housing;
c. a plurality of printed circuit boards within said housing maintained in a spaced and generally parallel array by said holding means, each of said printed circuit boards having heat generating electronic components mounted thereon and including means defining passageways therethrough configured for passage of said fluid coolant by the formation of fluid jet streams, said passageways positioned to provide direct impingement of said streams onto each component mounted on the next successive board in said array for providing localized and highly efficient cooling to said components; and
d. means for providing flow of fluid coolant through said housing.

### Claim 2 (depends on 1)

The electronics cooling system as recited in claim 1 wherein said inlet defines a plurality of fluid jet forming passageways communicating with the interior of said housing for conducting coolant thereinto by directing fluid jet streams onto the first board in said array.

### Claim 3 (depends on 1)

The electronics cooling system as recited in claim 1 wherein said passageway means comprises an eyelet in each said board presenting a smooth duct for forming a fluid jet of said coolant through said printed circuit board.

### Claim 4 (depends on 1)

The electronics cooling system as recited in claim 1 wherein the diameter of each said fluid jet forming passageway in said printed circuit board is from about 0.211 cm to about 0.423 cm.

### Claim 5 (depends on 1)

The electronics cooling system as recited in claim 1 wherein the ratio of the spacing between said printed circuit boards to the diameter of each said fluid jet forming passageway is from about 4:1 to about 10:1.

### Claim 6 (depends on 3)

The electronics cooling system as recited in claim 3 wherein the inside diameter of said eyelet is from about 0.211 cm to about 0.423 cm.

### Claim 7 (depends on 3)

The electronics cooling system as recited in claim 3 wherein the ratio of the spacing between said printed circuit boards to inside diameter of said eyelet is from about 4:1 to about 10:1.