# US 2022/0034591 A1 · Liquid cooling device and projection device

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- Number: US 2022/0034591 A1
- Document ID: US20220034591A1
- Status: Published application
- Kind: A1
- Application number: 17/384,808
- Filed: 2021-07-26
- Published: 2022-02-03
- Earliest claimed: 2020-07-31
- Assignees: Coretronic Corporation
- Applicants: Coretronic Corporation
- Inventors: SHI-WEN LIN; PEI-RONG WU
- Web page: https://patentgrep.com/patent/US20220034591A1

## CPC

- F28D 1/05341: {with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators}
- F28D 1/05383: {with multiple rows of conduits or with multi-channel conduits (F28D1/05391 takes precedence)}
- F28D 1/0435: {Combination of units extending one behind the other (F28D1/0452 takes precedence)}
- F28F 1/022: {with multiple channels}
- F28F 1/128: {Fins with openings, e.g. louvered fins}
- F28F 1/32: the means having portions engaging further tubular elements
- G03B 21/16: Cooling; Preventing overheating
- F28D 2021/0028: {for cooling heat generating elements, e.g. for cooling electronic components or electric devices}
- F28D 2021/0031: {Radiators for recooling a coolant of cooling systems}
- Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A liquid cooling device includes a first liquid cooling row having a first inflow end and a first outflow end for liquid to flow in a first direction, a second liquid cooling row having a second inflow end and a second outflow end, and a fan. The second liquid cooling row is disposed opposite to the first liquid cooling row. The second inflow end is connected to the first outflow end for the liquid flowing out from the first outflow end to flows in a second direction opposite to the first direction. Airflow generated by the fan sequentially flows through the second and first liquid cooling rows to cool the liquid. A projection device having the liquid cooling device is also provided.

## Claims

### Claim 1

A liquid cooling device, comprising: a first liquid cooling row, a second liquid cooling row, and a fan, wherein
the first liquid cooling row has a first inflow end and a first outflow end for liquid to flow from the first inflow end to the first outflow end in a first direction;
the second liquid cooling row is disposed opposite to the first liquid cooling row, the second liquid cooling row has a second inflow end and a second outflow end, the second inflow end is connected to the first outflow end for the liquid flowing out of the first outflow end to flow from the second inflow end to the second outflow end in a second direction, wherein the first direction is opposite to the second direction; and
the fan is adapted to generate airflow, and the airflow sequentially flows through the second liquid cooling row and the first liquid cooling row to cool the liquid.

### Claim 2 (depends on 1)

The liquid cooling device according to claim 1, wherein the first liquid cooling row comprises a plurality of first liquid cooling tubes arranged at intervals, each of the plurality of first liquid cooling tubes extends in the first direction, the second liquid cooling row comprises a plurality of second liquid cooling tubes arranged at intervals, each of the plurality of second liquid cooling tubes extends in the second direction, and the plurality of first liquid cooling tubes are respectively opposite to the plurality of second liquid cooling tubes.

### Claim 3 (depends on 2)

The liquid cooling device according to claim 2, wherein the first liquid cooling row further comprises a plurality of first heat dissipating elements connected between the plurality of first liquid cooling tubes, and the second liquid cooling row further comprises a plurality of second heat dissipating elements connected between the plurality of second liquid cooling tubes.

### Claim 4 (depends on 3)

The liquid cooling device according to claim 3, wherein the plurality of first heat dissipating elements and the plurality of second heat dissipating elements comprise a plurality of heat dissipating fins.

### Claim 5 (depends on 2)

The liquid cooling device according to claim 2, wherein the plurality of first liquid cooling tubes and the plurality of second liquid cooling tubes comprise a plurality of flat tubes.

### Claim 6 (depends on 2)

The liquid cooling device according to claim 2, wherein
the first liquid cooling row further comprises a first header tank and a second header tank, the plurality of first liquid cooling tubes are connected between the first header tank and the second header tank, the first header tank has the first inflow end, and the second header tank has the first outflow end; and
the second liquid cooling row further comprises a third header tank and a fourth header tank, the plurality of second liquid cooling tubes are connected between the third header tank and the fourth header tank, the third header tank has the second inflow end, and the fourth header tank has the second outflow end.

### Claim 7 (depends on 1)

The liquid cooling device according to claim 1, wherein the first liquid cooling row and the second liquid cooling row are separated by a predetermined distance.

### Claim 8 (depends on 1)

The liquid cooling device according to claim 1, further comprising a liquid conduit, wherein the liquid conduit is connected between the first outflow end and the second inflow end.

### Claim 9

A projection device, comprising: an illumination system, a light valve, a projection lens, and a cooling system, wherein the illumination system comprises a light source, the light source is adapted to provide an illumination beam, the light valve is disposed on a transmission path of the illumination beam to convert the illumination beam into an image beam, the projection lens is disposed on a transmission path of the image beam, and the cooling system comprises a liquid cooling device, at least one heat absorbing element, and a liquid conveying pipeline, wherein
the liquid cooling device comprises a first liquid cooling row, a second liquid cooling row, and a fan, wherein
the first liquid cooling row has a first inflow end and a first outflow end for liquid to flow from the first inflow end to the first outflow end in a first direction;
the second liquid cooling row is disposed opposite to the first liquid cooling row, the second liquid cooling row has a second inflow end and a second outflow end, and the second inflow end is connected to the first outflow end for the liquid flowing out of the first outflow end to flow from the second inflow end to the second outflow end in a second direction, wherein the first direction is opposite to the second direction; and
the fan is adapted to generate airflow, and the airflow sequentially flows through the second liquid cooling row and the first liquid cooling row to cool the liquid;
the at least one heat absorbing element is connected to at least one of the light source and the light valve, and the heat absorbing element has a liquid inflow end and a liquid outflow end; and
the liquid conveying pipeline is connected in series with the heat absorbing element and the liquid cooling device, wherein the liquid flowing out from the second outflow end flows into the heat absorbing element through the liquid conveying pipeline and the liquid inflow end and flows into the first inflow end through the liquid outflow end and the liquid conveying pipeline.

### Claim 10 (depends on 9)

The projection device according to claim 9, wherein the cooling system further comprises a pump and a liquid storage tank, and the liquid conveying pipeline is also connected in series with the pump and the liquid storage tank.

### Claim 11 (depends on 10)

The projection device according to claim 10, wherein the first liquid cooling row comprises a plurality of first liquid cooling tubes arranged at intervals, each of the plurality of first liquid cooling tubes extends in the first direction, the second liquid cooling row comprises a plurality of second liquid cooling tubes arranged at intervals, each of the plurality of second liquid cooling tubes extends in the second direction, and the plurality of first liquid cooling tubes are respectively opposite to the plurality of second liquid cooling tubes.

### Claim 12 (depends on 11)

The projection device according to claim 11, wherein the first liquid cooling row further comprises a plurality of first heat dissipating elements connected between the plurality of first liquid cooling tubes, and the second liquid cooling row further comprises a plurality of second heat dissipating elements connected between the plurality of second liquid cooling tubes.

### Claim 13 (depends on 12)

The projection device according to claim 12, wherein the plurality of first heat dissipating elements and the plurality of second heat dissipating elements comprise a plurality of heat dissipating fins.

### Claim 14 (depends on 11)

The projection device according to claim 11, wherein the plurality of first liquid cooling tubes and the plurality of second liquid cooling tubes comprise a plurality of flat tubes.

### Claim 15 (depends on 11)

The projection device according to claim 11, wherein
the first liquid cooling row further comprises a first header tank and a second header tank, the plurality of first liquid cooling tubes are connected between the first header tank and the second header tank, the first header tank has the first inflow end, and the second header tank has the first outflow end; and
the second liquid cooling row further comprises a third header tank and a fourth header tank, the plurality of second liquid cooling tubes are connected between the third header tank and the fourth header tank, the third header tank has the second inflow end, and the fourth header tank has the second outflow end.

### Claim 16 (depends on 9)

The projection device according to claim 9, wherein the first liquid cooling row and the second liquid cooling row are separated by a predetermined distance.

### Claim 17 (depends on 9)

The projection device according to claim 9, wherein the liquid cooling device further comprises a liquid conduit connected between the first outflow end and the second inflow end.