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Liquid cooling system and electronic device including the same

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Liquid cooling system and electronic device including the same


Disclosed is a liquid cooling system mounted on an electronic device. The liquid cooling system includes flow path (20) through which a refrigerant circulates, and pump (21) and reserve tank (22) arranged on flow path (20). A part of the side face of reserve tank (22) is set back to the vicinity of the center of reserve tank (22) to form concave portion (40). on the front center of concave portion (40), outlet (42) through which the refrigerant flows out is formed.

Inventor: Naoki Masuda
USPTO Applicaton #: #20120298339 - Class: 16510433 (USPTO) - 11/29/12 - Class 165 
Heat Exchange > Intermediate Fluent Heat Exchange Material Receiving And Discharging Heat >Liquid Fluent Heat Exchange Material >Cooling Electrical Device

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The Patent Description & Claims data below is from USPTO Patent Application 20120298339, Liquid cooling system and electronic device including the same.

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TECHNICAL FIELD

The present invention relates to a liquid cooling system mounted on an electronic device.

BACKGROUND ART

An electronic device such as a personal computer or a projector includes an element or a light source for generating heat during an operation. The electronic device also includes a component or an element heated by the heat generated from the element or the light source. For example, a CPU (Central Processing Unit) included in the personal computer, or a discharge lamp or a LED (Light-Emitting Diode) included in the projector generates heat during its operation. Further, a memory or a hard disk included in the personal computer is heated by the heat generated from the CPU. An image forming element (liquid crystal panel or DMD (Digital Micro-mirror Device) included in the projector, or a mirror, a lens or a polarizing plate disposed on an optical path is heated by the heat generated from the light source (heat of light output from the light source). This necessitates cooling of the element, the light source or the component. Hereinafter, the element, the light source, or the component is generically referred to as a “cooling target”.

Systems that cool the cooling targets are largely classified into an air cooling type and a liquid cooling type. The liquid cooling system cools the cooling target by heat exchanging between the cooling target and a liquid (refrigerant). Therefore, a general liquid cooling system includes a flow path to circulate the refrigerant, on which a pump for circulating the refrigerant and a tank for storing a predetermined amount of refrigerant are arranged.

In the tank, there is formed a gas layer for absorbing volume expansion of the refrigerant caused by the temperature change. A gas may be mixed in the flow path against the aim. The entry of the gas from the tank or the flow path into the pump may cause a pump operation failure.

Thus, there is proposed a technology for preventing the entry of the gas from the tank or the flow path into the pump. For example, Patent Literature 1 describes a liquid cooling system (water cooling system) that includes a reserve tank. An inlet is formed on the right side face of the reserve tank disclosed in Patent Literature 1, and a hollow tube having an outlet is formed on the left side face. One end (outlet) of the hollow tube extends to the center of the reserve tank. In other words, the outlet is located in the center of the reserve tank. Locating the outlet in the center of the reserve tank enables the outlet to be always held below the water surface of the refrigerant. As a result, even when the posture change of the reserve tank is accompanied by the change of the water surface of the refrigerant, the gas does not flow out from the reserve tank through the outlet.

CITATION LIST Patent Literature

Patent Literature 1: JP2003-78271A

SUMMARY

Technical Problems

However, the technology disclosed in Patent Literature 1 has the following problem. In Patent Literature 1, there is no description as to whether the hollow tube is formed integrally with a tank body. Supposing that the hollow tube is formed integrally with the tank body, the following problem occurs. Generally, the reserve tank is formed by using a mold. However, it is extremely difficult to manufacture a molded article where a slender tubular portion and a body portion are integrally formed by using a mold.

On the other hand, when the hollow tube and the tank body are separately formed, the following problem occurs. When the hollow tube and the tank body are separately formed, the hollow tube must be inserted into a hole formed in the side face of the tank body to be fixed. This increases the number of manufacturing steps. Specifically, the step of fixing the hollow tube inserted into the hole formed in the side face of the tank body by fixing means such as adhesion or welding is necessary.

Generally, in the case of the reserve tank disclosed in Patent Literature 1, manufacturing the reserve tank is difficult, or manufacturing takes time and labor, and costs are high.

SOLUTION TO PROBLEMS Solution to Problems

A liquid cooling system according to the present invention is mounted on an electronic device. The liquid cooling system of the present invention includes a flow path through which a refrigerant circulates, and a pump and a reserve tank arranged on the flow path. A part of the side face of the reserve tank is set hack to the vicinity of the center of the reserve tank to form a concave portion. On the front center of the concave portion. an outlet through which the refrigerant flows out is formed.

EFFECTS OF INVENTION Advantageous Effects of Invention

In the liquid cooling system according to the present invention, the outlet is located near the center of the tank by setting hack the outlet of the reserve tank to the tank center. As a result, without using any slender tubular member such as a hollow tank, the outlet can be disposed near the center of the tank.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view showing the built-in structure of a projector in which the liquid cooling system of the present invention is mounted.

FIG. 2 is an exploded perspective view showing a light source unit shown in FIG. 1.

FIG. 3 is a perspective view showing the main flow of a refrigerant in the liquid cooling system shown in FIG. 1.



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stats Patent Info
Application #
US 20120298339 A1
Publish Date
11/29/2012
Document #
13577864
File Date
02/10/2010
USPTO Class
16510433
Other USPTO Classes
International Class
28D15/00
Drawings
11



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