# US 2019/0380228 A1 · Liquid immersion tank

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- Number: US 2019/0380228 A1
- Document ID: US20190380228A1
- Status: Published application
- Kind: A1
- Application number: 16/424,689
- Filed: 2019-05-29
- Published: 2019-12-12
- Earliest claimed: 2018-06-07
- Assignees: Fujitsu Limited
- Applicants: Fujitsu Limited
- Inventors: Keita Hirai; Masayuki Watanabe
- Web page: https://patentgrep.com/patent/US20190380228A1

## CPC

- H05K 7/20281: {Thermal management, e.g. liquid flow control}
- H05K 7/20772: {within server blades for removing heat from heat source}
- F28F 27/00: Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus (control arrangements in general G05)
- G06F 1/20: Cooling means
- H05K 7/20236: {by immersion}
- H05K 7/20272: {Accessories for moving fluid, for expanding fluid, for connecting fluid conduits, for distributing fluid, for removing gas or for preventing leakage, e.g. pumps, tanks or manifolds}
- G06F 2200/201: Cooling arrangements using cooling fluid
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A liquid immersion tank includes a housing configured to house a heat generator, a gutter provided over the housing, and configured to form a flow path through which a coolant flows, a flow rate adjuster provided at an outflow port through which the coolant flows out from the flow path, and configured to adjust an outflow amount of the coolant, a slope provided over the housing, and configured to include a down-flow surface through which the coolant branched from the flow path flows down toward the housing, the coolant flowing through the flow rate adjuster, and a tank configured to accommodate the housing.

## Claims

### Claim 1

A liquid immersion tank comprising:
a housing configured to house a heat generator;
a gutter provided over the housing, and configured to form a flow path through which a coolant flows;
a flow rate adjuster provided at an outflow port through which the coolant flows out from the flow path, and configured to adjust an outflow amount of the coolant;
a slope provided over the housing, and configured to include a down-flow surface through which the coolant branched from the flow path flows down toward the housing, the coolant flowing through the flow rate adjuster; and
a tank configured to accommodate the housing.

### Claim 2 (depends on 1)

The liquid immersion tank according to claim 1,
wherein the down-flow surface includes:
an inclined surface inclined downward as a distance from the flow rate adjuster increases, and
a side surface continuous from the inclined surface so as to guide the coolant to flow down the inclined surface to the housing.

### Claim 3 (depends on 2)

The liquid immersion tank according to claim 2,
wherein the slope includes:
a side plate portion disposed to face the side surface, and
a gap formed between the side surface and the side plate portion.

### Claim 4 (depends on 1)

The liquid immersion tank according to claim 1,
wherein the flow rate adjuster includes:
a movable weir provided to be movable up and down, and
a spring that moves up the movable weir to be biased in a direction to close the outflow port.

### Claim 5 (depends on 4)

The liquid immersion tank according to claim 4,
wherein the slope includes a pressing portion configured to press the movable weir.

### Claim 6 (depends on 1)

The liquid immersion tank according to claim 1,
wherein the slope is provided on the down-flow surface and includes a notch into which the coolant flows.

### Claim 7 (depends on 6)

The liquid immersion tank according to claim 6,
wherein a plurality of notches are provided along a direction in which the slope extends starting from the flow rate adjuster.

### Claim 8 (depends on 1)

The liquid immersion tank according to claim 1,
wherein a width of the slope is narrowed as a distance from the flow rate adjuster increases starting from the flow rate adjuster.