JPH10254583A - Cooling structure for notebook type personal computer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the cooling structure of a notebook type personal computer with excellent cooling ability. SOLUTION: In this cooling structure of the notebook type personal computer for which an arithmetic processor 27 is installed inside a personal computer main body 20, the personal computer main body 20 is provided with a freely openable and closable display 22, one end part on a heat input side of a heat pipe mechanism 35 is attached to the arithmetic processor 27 further and the other end part on the heat radiation side is disposed to the display 22, a void part 24 for air flow housing the other end part of the heat pipe mechanism 30 is provided inside the display 22. Also, an opening part 26 for taking in air communicated with the void part 24 is formed at the lower side part of the display 22 in an open state. Further, the opening part 25 for discharging the air communicated with the void part 24 is formed at the upper side part of the display 22 in the open state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure of a notebook personal computer that cools an arithmetic processing unit provided in the notebook personal computer by using a heat pipe.

[0002]

2. Description of the Related Art In recent years, so-called portable personal computers of the notebook type and the sub notebook type have been remarkably spread. Since the main purpose of this type of personal computer is portability, a reduction in size and weight is strongly desired. Therefore, naturally, the space occupied by the cooling element in the internal space of the personal computer is extremely limited. On the other hand, the output of the arithmetic processing unit has been increasing year by year with the increase in the number of functions and the speed processing. Therefore, conventionally, a heat pipe having an excellent heat transporting power has been attracting attention as a cooling element.

FIGS. 9 and 10 show an example of a conventional portable personal computer cooling device. In these figures, the personal computer body 1 is formed of a relatively thin hollow rectangular container made of a plastic panel, a metal panel, or the like, and has a size of about A4 size according to JIS (Japanese Industrial Standard). A keyboard 2 and a display 3 are provided on the upper surface of the personal computer 1.

The keyboard 2 and the display 3 are configured to freely rotate within a predetermined range around a rotation shaft 4 formed on the personal computer main body 1 side, and are so-called open / close members. . That is, the keyboard 2 and the display 3 can be raised from the personal computer main body 1 respectively, or can be tilted toward the personal computer main body 1 from that state.

The display 3 has a liquid crystal screen 50 on one side.
And a hollow aluminum plate 5 as an electromagnetic shield plate is mounted on the inner surface of the hollow container.
The same aluminum thin plate 5 as described above is also mounted on the back side of the keyboard section 2 (on the side of the personal computer 1). The thin aluminum plate 5 is usually provided as a standard feature in notebook personal computers. The front space (the keyboard 2 side in FIG. 9) of the two divided internal spaces of the PC body 1
Contains a removable hard disk drive 6, a floppy disk drive, a battery (both not shown), and the like. Here, the above-described standing / tilting operation (opening / closing operation) of the keyboard unit 2 with respect to the personal computer body 1 is performed when the hard disk drive 6, the battery, and the like are exchanged.

On the other hand, at the bottom of the space on the rear side of the personal computer main body 1, one end of the first heat pipe 7 is disposed in a state of being inserted into the aluminum block 8. The aluminum block 8 is fixed to the personal computer body 1 by an appropriate means. On the upper surface of the aluminum block 8, a CPU
9, and a plurality of printed circuit boards 10 are installed above the CPU 9.

The other end of each of the first heat pipes 7 is bent substantially at right angles to the end arranged on the aluminum block 8 side in the vertical direction in FIG. The rotation shaft 4 extends on the same axis as the center axis. The end of the second heat pipe 12 is rotatably fitted to the end of the double pipe structure. Therefore, the connecting portion 13 between the first heat pipe 7 and the second heat pipe 12 is formed on the same axis as the central axis of the rotating shaft 4. The other end of the second heat pipe 12 is disposed in close contact with the back surface of the aluminum thin plate 5 on the display 3 side so that heat can be transferred. That is, the display 3
The end of the second heat pipe 12 is disposed in the internal space of the second heat pipe 12.

Therefore, with the use of personal computers,
When heat is generated in U9, the heat is transmitted to one end of each first heat pipe 7 via the aluminum block 8, and the heat pipe operation is automatically started. That is, CPU
The heat of 9 evaporates the working fluid into vapor, which flows toward the other end of the container. As described above, since the distal end of each first heat pipe 7 is covered with the outer circumference by the second heat pipe 12, the heat of the CPU 9 is transmitted from the first heat pipe 7 to the second heat pipe 12.
Then, the second heat pipe 12 starts operating. The working fluid in each of the first heat pipes 7 that has been radiated and liquefied returns to the evaporating section due to gravity.

On the other hand, the vapor of the working fluid generated in the second heat pipe 12 flows toward the end disposed on the aluminum thin plate 13 side, where heat is taken and condensed. In this way, the heat generated inside the personal computer body 1 is released into the display 3 via the first heat pipe 7 and the second heat pipe 12, and as a result, the CPU 9 is cooled.

[0010]

As described above, in this type of personal computer, the CPU output is increasing year by year due to the increase in the number of functions and the processing speed. Requested.

However, in the above-mentioned conventional cooling device,
Since the aluminum thin plate 5 provided inside the display 3 is used as a direct heat sink of the second heat pipe 12, in order to release the heat released from the aluminum thin plate 5 to the outside of the display 3, the display 3 must be used. It will mediate the case itself and the air inside it,
Thermal resistance must be large. For this reason, in the cooling device described above, there is a possibility that the CPU 9 cannot be cooled sufficiently, particularly when the personal computer is used continuously for a long time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling structure for a notebook personal computer having excellent cooling ability.

[0013]

In order to achieve the above object, the present invention provides an arithmetic processing unit as a heat source inside a personal computer main body and a rotating mechanism mounted on the personal computer main body. A heat-opening end of the heat pipe mechanism is attached to the arithmetic processing unit so that heat can be exchanged, and the other end of the heat pipe mechanism on the heat radiation side is connected to the display. In the cooling structure of the arranged notebook type personal computer, a cavity for air flow accommodating the other end of the heat pipe mechanism is provided inside the display, and a lower portion of the display in an open state. An opening for air intake communicating with the hollow portion is formed in the upper portion of the display in an open state, and an empty portion communicating with the hollow portion is formed in an upper portion of the display in an open state. It is characterized in that the opening for discharge is formed.

Also in this invention, heat is generated in the arithmetic processing unit with the use of the personal computer, and the heat is transmitted to one end of the heat pipe mechanism on the heat input side. Then, the working fluid inside the heat pipe mechanism evaporates, and the working fluid vapor flows toward the other end side where both the temperature and the internal pressure are low, that is, toward the end arranged in the cavity of the display. , Where heat such as air is deprived and condensed.

The air that has received heat from the heat pipe mechanism in the cavity moves upward due to its low specific gravity,
The air is discharged to the outside of the display through the air discharge opening. Accordingly, air outside the display enters the cavity through the air intake opening. As described above, since a circulating flow is generated from the air intake opening to the air exhaust opening in the cavity, the heat carried by the heat pipe mechanism is quickly discharged to the outside of the display. The processing equipment is cooled well.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG.
Consists of a relatively thin rectangular container formed of a metal panel such as a plastic panel or a magnesium alloy almost in the same manner as conventionally known, and has a size of about A5 to A4 size according to JIS (Japanese Industrial Standard). It makes a difference. A keyboard 2 is provided on the upper surface of the personal computer body 20.
1 is attached by means such as fitting.
Further, the keyboard 21 may be configured to stand up and tilt with respect to the personal computer body 20 about a rotation axis provided on the personal computer body 20 side.

On the other hand, a CPU 27 (central processing unit) corresponding to the processing unit of the present invention is installed at the bottom inside the personal computer body 20. FIG. 3 of the CPU 27.
An aluminum plate 40 as a heat transfer member is provided on the upper surface of the substrate. Furthermore, a connector 28 is provided in the vicinity of the display 22 inside the personal computer main body 20, and is attached to the personal computer main body 20 by appropriate means.

The connector 28 is configured to integrally hold two heat pipes described later, for example, C
It is made of a metal block such as u or Al. Two circular holes 29 having the same diameter are formed in this connector 28 so as to communicate with each other in the vertical direction and to be arranged in parallel. Each of the circular holes 29 has a linear shape and penetrates to both side surfaces in FIG.

A display 22 is provided on the upper surface of the personal computer main body 20 so as to freely open and close within a predetermined range around a rotation axis (not shown). Display 22
Has a substantially flat plate-like shape provided with a screen 23 made of a liquid crystal panel on one side. As an example, a linear cavity 24 extending in the vertical direction is provided inside the right end in FIG. As an example, the cavity 24 is opened in a rectangular shape.

An outlet 25 having the same opening shape as the cavity 24 is formed at a position directly above the cavity 24 in the upper edge of the display 22 in FIG. The outlet 25 corresponds to an opening for discharging air, and communicates with the cavity 24. On the other hand, an inflow port 26 having the same opening shape as the cavity 24 is formed at a position directly below the cavity 24 in the lower edge of the display 22. This inlet 2
6 is equivalent to an opening for air intake,
It communicates with the cavity 24. That is, the configuration is such that the cavity 24 penetrates in the height direction of the display 22.

Inside the cavity 24, a heat sink 31 for enlarging one end of the first heat pipe 30 and a heat radiation surface is disposed along the longitudinal direction of the cavity 24. The first heat pipe 30 is, for example, a case in which pure water is sealed in a copper container coated with hard chrome, and an end disposed in the hollow portion 24 is formed in a rectangular cross section by crushing or the like. I have.

The heat sink 31 has a configuration in which a plurality of flat fins 33 are provided in an upright state with respect to a flat base 32 as an example. Is attached to the first heat pipe 30 in a direction extending along the direction, in other words, a direction not intersecting with the hollow portion 24. In addition, both base 3
The container 2 is fixed by fitting the container into a mounting groove 34 provided on the rear surface side of the container 2.

The other end of the first heat pipe 30 has a circular cross section, and is inserted into the upper circular hole 29 of the connector 28 in FIG. The end of the first heat pipe 30 held by the connector 28 is arranged on the same axis as the rotation axis of the display 22.

On the other hand, the lower circular hole 29 in FIG.
, A second heat pipe 35 is inserted at one end from the left side. The other end of the second heat pipe 35, that is, the end that is not held by the connector 28, extends along the upper surface of the aluminum plate 40 so that heat can be transferred in a state where several portions are appropriately bent. Are fixed by appropriate means not shown. Therefore, the CPU 27 and the second heat pipe 35 are connected so that heat can be transmitted. As the second heat pipe, for example, a pipe in which pure water is sealed as a working fluid in a copper container having a circular cross section plated with hard chromium can be adopted.

Although not specifically shown, a thermal joint is applied between each heat pipe and the circular hole 29. Therefore, when the display 22 is raised and tilted, the first heat pipe 30 rotates around its own central axis while being in close contact with the side surface of the second heat pipe. In other words, regardless of the orientation of the display 22, the first heat pipe 30 and the second heat pipe 3
5 is configured to maintain the close contact state.

Next, the operation of the notebook computer cooling structure configured as described above will be described. The above-mentioned notebook-type personal computer also requires CP
Heat is generated from U27. At this time, the display 22 is usually in a state of standing upright from the personal computer body 20. The heat released from the CPU 27 is
0 to the one end of the second heat pipe 35.

At this point, since a temperature difference occurs at both ends of the second heat pipe 35, the operation is automatically started. That is, the liquid-phase working fluid sealed in the container is heated and evaporated, and the vapor flows toward the other end of the container having a low internal pressure, the end held by the connector 28, where The heat is taken by the container of one heat pipe 30 and condensed.

That is, heat is transmitted from the second heat pipe 35 to the first heat pipe 30. In that case, the arrangement of the first heat pipe 30 on the heat receiving side is above the second heat pipe 35 on the heat radiating side, and the contact point between the heat pipes is covered with the metal connector 28, and so on. Good heat transfer.

The working fluid of the second heat pipe 35 that has radiated and liquefied returns to the end disposed on the CPU 27 side due to gravity or the like, and the heat of the CPU 27 transmitted through the aluminum plate 40 is transmitted. Is heated again.

On the other hand, when heat is transferred from the second heat pipe 35, the operation of the first heat pipe 30 is started.
In this case, since the electromagnetic shield plate 3 is in the upright state, the first heat pipe 30 operates in the bottom heat mode in which the evaporator is located below the condenser. More specifically, the steam of the working fluid W is generated on the inner surface of the end of the container held by the connector 28. The working fluid vapor flows toward the other end of the container where the internal pressure is low and higher, that is, toward the end disposed in the cavity 24, where heat is taken by air and the like. We condense.

The heat carried by the working fluid is transferred from the container of the first heat pipe 30 to the heat sink, and is released from the surface of the base 32 and each fin 33 into the cavity 24. The high-temperature air flows upward due to its low specific gravity, and flows out of the display 22 through the outlet 25. As the air moves in the cavity 24 in this manner, the pressure on the lower side of the cavity 24 becomes low, so that air outside the display 22 enters the cavity 24 via the inflow port 26.

The air rises along the cavity 24 and flows out of the outlet 25 to the outside of the display 22 while contacting the condensing part of the first heat pipe 30 and the heat sink 31. That is, a circulating flow is generated from the lower side to the upper side inside the hollow portion 24.

The working fluid W that has radiated heat and returned to the liquid phase
Flows down the inner wall surface of the container,
In the inner surface of the portion inserted into the circular hole 29, the heat is again evaporated by the heat of the CPU 27 transmitted through the connector 28 and the second heat pipe 35. Thereafter, the same cycle is continued, and as a result, the CPU 27 is cooled.

As described above, since the air flows from the lower side to the upper side in the hollow portion 24, the heat of the CPU 27 released from the first heat pipe 30 is quickly transmitted to the display 2.
2 can be discharged to the outside, and as a result, the CPU 27
The cooling capacity is greatly improved as compared with the conventional case.

In the above-described specific example, a configuration in which two heat pipes are connected to each other so as to be able to exchange heat by using a connector is illustrated. However, the present invention is not limited to the specific example, and for example, a second heat pipe may be used. It is also possible to adopt a configuration in which the end of the pipe has a double-tube structure with a circular cross section, and the end of the circular cross section of the first heat pipe is fitted therein. Furthermore, the configuration is not necessarily limited to the configuration using a plurality of heat pipes, and the configuration is such that the container is provided with one flexible heat pipe formed of a corrugated pipe or the like so as to connect the arithmetic processing unit and the hollow portion. It can also be. Further, the heat pipe does not necessarily have to be inserted into the hollow portion, and may have any configuration as long as the side surface of the container is exposed along the hollow portion.

[0036]

As is apparent from the above description, according to the present invention, a circulating flow is generated from the air intake opening to the air exhaust opening in the cavity.
The heat of the arithmetic processing device carried to the cavity by the heat pipe mechanism can be quickly discharged to the outside of the display, and therefore, the cooling capacity for the arithmetic processing device is improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a notebook personal computer according to the present invention.

FIG. 2 is a schematic diagram showing an enlarged part II of FIG. 1 of the display.

FIG. 3 is a schematic diagram showing an arrangement relationship among a cavity, an inlet, and an outlet in a display.

FIG. 4 is a schematic diagram showing an arrangement of a connector and a personal computer main body.

FIG. 5 is a view showing the connector with a part cut away.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a diagram showing a hollow portion and a first heat pipe.

FIG. 8 is a sectional view showing a heat sink and a first heat pipe.

FIG. 9 is a schematic view showing a cooling structure of a conventional notebook personal computer.

FIG. 10 is a schematic view of the notebook personal computer as viewed from the upper surface side of a keyboard.

[Explanation of symbols]

20: PC body, 22: Display, 24 ...
Cavity, 25 ... outlet, 26 ... inlet, 27 ... C
PU, 28 ... connector, 30 ... first heat pipe,
35 ... Second heat pipe.

Claims (1)

[Claims] An arithmetic processing device serving as a heat source is installed inside a personal computer main body, a display which can be opened and closed via a rotating mechanism is provided in the personal computer main body, and a heat pipe mechanism is provided in the arithmetic processing device. One end of the heat input side is attached so as to be able to exchange heat, and the other end of the heat pipe mechanism on the heat radiation side is a cooling structure of a notebook type personal computer arranged in the display. An air flow cavity accommodating the other end of the heat pipe mechanism is provided, and an air intake opening communicating with the cavity is formed in a lower portion of the display in an open state. A notebook type personal computer characterized in that an air discharge opening communicating with the cavity is formed in an upper part of the display in a state. Cooling structure of emissions.