CN117055710A - Heat dissipation system - Google Patents

Abstract

The invention provides a heat dissipation system which is suitable for a portable electronic device with two heat sources. The heat dissipation system comprises a fan, two heat dissipation fin groups, a movable gate, a first heat pipe, a second heat pipe and a control unit. The fan is a centrifugal fan and is provided with a main air outlet and an auxiliary air outlet, the radiating fins are respectively arranged at the main air outlet and the auxiliary air outlet, and the movable gate is arranged at the auxiliary air outlet. The first heat pipe is in thermal contact with a heat source and in thermal contact with a heat radiation fin group positioned at the main air outlet. The second heat pipe is in thermal contact with one of the heat sources and in thermal contact with the two heat dissipation fin groups. The control unit is electrically connected with the movable gate to drive the movable gate to open or close the auxiliary air outlet according to the load of the heat source.

Description

Heat dissipation system

Technical Field

The invention relates to a heat dissipation system.

Background

With the change of the use habit of people's computers, notebook computers have become an important product type in the market. Because the notebook computer is small in size and convenient to carry, people often carry with the notebook computer to commute, do some word processing in offices, watch some articles or films on the internet in coffee shops, and possibly play a few games with the notebook computer of three-five friends. If the user particularly requires the smoothness or picture definition of the notebook computer in game playing, the notebook computer needs to be equipped with a higher-order processor and a display chip. However, the higher-order processor and the display chip are accompanied by the problem of generating excessive waste heat, and the notebook computer is limited in size, which is often not ideal in heat dissipation design.

Conventionally, some notebook computers are internally designed with fans, and waste heat inside the notebook computer is brought out by utilizing air flow. However, as the performance of the notebook computer is more and more excellent, the waste heat generated by the notebook computer is also increased rapidly, and as the use state of the notebook computer is different, heat dissipation conditions corresponding to different states are also needed, so that various heat dissipation demands can be achieved by an effective means.

Disclosure of Invention

The invention aims at a heat radiation system which drives a movable gate to open and close a secondary air outlet of a double-outlet fan according to the load state of a heat source, and corresponds to different heat radiation requirements by an effective heat radiation means.

According to the embodiment of the invention, the heat dissipation system is suitable for a portable electronic device with multiple heat sources. The heat dissipation system comprises a fan, two heat dissipation fin groups, a movable gate, a first heat pipe, a second heat pipe and a control unit. The fan is a centrifugal fan and is provided with a main air outlet and an auxiliary air outlet, the radiating fins are respectively arranged at the main air outlet and the auxiliary air outlet, and the movable gate is arranged at the auxiliary air outlet. The first heat pipe is in thermal contact with a heat source and in thermal contact with a heat radiation fin group positioned at the main air outlet. The second heat pipe is in thermal contact with one of the heat sources and in thermal contact with the two heat dissipation fin groups. The control unit is electrically connected with the movable gate to drive the movable gate to open or close the auxiliary air outlet according to the load of the heat source.

Based on the above, the portable electronic device has multiple heat sources, the fan of the heat dissipation system has a main air outlet and an auxiliary air outlet, and the heat sources are heat dissipation fins thermally contacted to the main air outlet and the auxiliary air outlet by different heat pipes, and then the movable gate controls the opening and closing of the auxiliary air outlet to form a bidirectional heat dissipation path or a unidirectional heat dissipation path. Therefore, the control unit can correspondingly open and close the auxiliary air outlet according to the respective load states of the heat sources, and the bidirectional heat dissipation path or the unidirectional heat dissipation path is adopted as a heat dissipation means so as to cope with different heat dissipation requirements.

In other words, since the internal space of the portable electronic device belongs to the environment of multiple heat sources, different load states exist according to different usage conditions, if the single heat dissipation means in the prior art cannot cope with the situation, the heat dissipation system of the present invention is needed, and the corresponding heat dissipation means can be provided according to the load states of the heat sources by the specific components such as the fan, the heat pipe and the movable gate, so that the heat dissipation system has both the improvement of heat dissipation efficiency and the optimization of operation efficiency.

Drawings

FIG. 1 is an internal schematic view of a portable electronic device according to an embodiment of the invention;

FIG. 2 is a schematic diagram illustrating electrical connection of related components of the heat dissipation system according to the present invention;

FIG. 3A is a schematic view of the first fan of FIG. 1;

FIG. 3B is a schematic view of the movable gate of FIG. 1;

fig. 4 and 5 are schematic diagrams of the heat dissipation system of fig. 1 in different states, respectively;

fig. 6 is a schematic diagram of a heat dissipation system according to another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.

Fig. 1 is an internal schematic view of a portable electronic device according to an embodiment of the present invention, and only a part related to the technical features of the embodiment is shown here. Fig. 2 is a schematic diagram of electrical connection of related components of the heat dissipation system of the present invention. Referring to fig. 1 and fig. 2 together, in the present embodiment, the heat dissipation system 100 is suitable for a portable electronic device (such as a notebook computer or a tablet computer) having two heat sources 20 and 30, the heat sources 20 and 30 are disposed in an inner space of the housing 130, wherein the heat source 20 is, for example, a display chip (GPU), and the heat source 30 is, for example, a Central Processing Unit (CPU). The heat dissipation system 100 includes a first fan 110, a second fan 120, heat dissipation fin groups 151 to 154, a movable shutter 160, a first heat pipe 141, a second heat pipe 142, a third heat pipe 143, and a control unit 150. The present invention is not limited to the examples of the first and second …, and the structural features of the members themselves are the same for the sake of easy recognition.

The first fan 110 and the second fan 120 are centrifugal fans, and each has a main air outlet E5 and a secondary air outlet E6. The heat dissipation fin sets 151 to 154 are respectively disposed at the main air outlets E5 and the auxiliary air outlets E6, and the movable gates 160 are respectively disposed at the auxiliary air outlets E6. The housing 130 further has a plurality of air outlets E1 to E4 corresponding to the fin groups 151 to 154, the primary air outlet E5 and the secondary air outlet E6, respectively, and the components shown in fig. 1 are configured.

Taking the casing 130 of the portable electronic device as a reference, the heat dissipation system 100 is disposed in the casing 130, where the main air outlet E5 is located at the rear side of the casing 130, the auxiliary air outlet E6 is located at the side of the casing 130, and if a notebook computer is taken as an example, a user operates the portable electronic device from the front side of the casing 130, the rear side is the pivot joint between the casing 130 and the screen (not shown), and the front side and the rear side are two opposite sides of the casing 130.

Furthermore, the first heat pipe 141 of the present embodiment is in thermal contact with the heat sources 20, 30, and in thermal contact with the heat dissipation fin sets 151, 152 located at the main air outlet E5. The second heat pipe 142 is in thermal contact with one of the heat sources (i.e., heat source 20) and with the heat fin sets 151, 153 at the primary air outlet E5 and the secondary air outlet E6 of the same fan (i.e., first fan 110). The third heat pipe 143 is in thermal contact with the other of the heat sources (i.e., the heat source 30) and with the heat fin sets 152, 154 at the primary air outlet E5 and the secondary air outlet E6 of the same fan (i.e., the second fan 120). Thermal contact herein means that heat can be smoothly transferred between components, and is not limited to structural contact.

Further, the first heat pipe 141 has a heat absorbing section 141a in thermal contact with the heat source 20, a heat absorbing section 141b in thermal contact with the heat source 30, a heat releasing section 141c in thermal contact with the heat sink fin group 151, and a heat releasing section 141d in thermal contact with the heat sink fin group 152, so that the heat generated by the heat source 20 is absorbed from the heat absorbing section 141a, and then transferred to the heat releasing section 141c, and the heat is smoothly discharged from the housing 130 through the air outlet E1 by the heat sink fin group 151 and the air flow generated by the first fan 110 from the main air outlet E5. In contrast, after the heat generated by the heat source 30 is absorbed by the heat absorbing section 141b, the heat is transferred to the heat releasing section 141d, and the heat is smoothly discharged out of the housing 130 through the air outlet E2 by the air flow generated by the heat dissipating fin set 152 and the second fan 120 from the main air outlet E5.

The second heat pipe 142 has a heat absorbing section 142a in thermal contact with the heat source 20, a heat releasing section 142b in thermal contact with the heat dissipating fin set 151, and a heat releasing section 142c in thermal contact with the heat dissipating fin set 153, so that after the heat generated by the heat source 20 is absorbed from the heat absorbing section 142a, the heat can be transferred to the heat releasing section 142b and the heat releasing section 142c, and a part of the heat can be smoothly discharged out of the casing 130 through the air outlet E1 by the heat dissipating fin set 151 and the air flow generated by the first fan 110 from the main air outlet E5, and another part of the heat can be smoothly discharged out of the casing 130 through the air outlet E3 by the heat dissipating fin set 153 and the air flow generated by the first fan 110 from the auxiliary air outlet E6.

The third heat pipe 143 has a heat absorbing section 143a in thermal contact with the heat source 30, a heat releasing section 143b in thermal contact with the heat dissipating fin group 152, and a heat releasing section 143c in thermal contact with the heat dissipating fin group 154, so that heat generated by the heat source 30 is absorbed from the heat absorbing section 143a and then transferred to the heat releasing section 143b and the heat releasing section 143c, and a part of the heat is smoothly discharged from the main air outlet E5 through the heat dissipating fin group 152 and the second fan 120 to the casing 130 through the air outlet E2, and another part of the heat is smoothly discharged from the sub air outlet E6 through the heat dissipating fin group 154 and the second fan 120 to the casing 130 through the air outlet E4.

Based on the corresponding arrangement of the first heat pipe 141, the second heat pipe 142 and the third heat pipe 143, the heat generated by the heat sources 20 and 30 can be smoothly dissipated out of the casing 130. Here, heat transfer techniques related to the heat pipe are known, and thus are not described in detail.

Furthermore, referring to fig. 2, the heat dissipation system 100 further includes temperature sensors R1 and R2 disposed beside the heat sources 20 and 30 respectively and not affecting each other, so as to sense the temperatures of the heat sources 20 and 30 respectively, the control unit 150 is electrically connected to the first fan 110, the second fan 120, the movable gate 160 and the temperature sensors R1 and R2, and the control unit 150 drives the movable gate 160 to open or close the auxiliary air outlet E6 of the first fan 110 and the second fan 120 according to the temperature sensing values of the two temperature sensors R1 and R2. Here, the control unit 150 may be another control chip or control circuit in the portable electronic device (i.e. the heat source 30) different from the cpu, or may be the cpu itself.

Fig. 3A is a schematic view of the first fan of fig. 1. Fig. 3B is a schematic view of the movable gate of fig. 1. Referring to fig. 3A and 3B together with fig. 1, it should be mentioned that the first fan 110 and the second fan 120 are centrifugal fans with dual air outlets and have the same structure, and are only in an upside-down state in the configuration shown in fig. 1. Furthermore, for the respective first fan 110 or second fan 120, on the premise of maintaining the same system noise, the airflow rate when the main air outlet E5 and the auxiliary air outlet E6 are both opened is 120% of the airflow rate when the main air outlet E5 is opened and the auxiliary air outlet E6 is closed, but the static pressure generated by the fans (the first fan 110 or the second fan 120) is reduced due to the increase of the number of air outlets (the main air outlet E5 and the auxiliary air outlet E6 are both opened). Accordingly, the air flow rate of the main air outlet E5 of the present embodiment can be adjusted by matching the aperture or the flow channel profile of the air outlet: airflow rate of the sub-outlet E6=6: 4. in addition, the movable gate 160 disposed at the auxiliary air outlet E6 includes a motor 161 and a baffle 162, the control unit 150 is electrically connected to the motor 161, and the baffle 162 is connected to the motor 161 to be rotatably lifted or rotated down by the driving of the motor 161, so as to achieve the effect of opening or closing the auxiliary air outlet E6 (which is also equivalent to increasing or decreasing the number of air outlets). The designer can adjust the flow ratio appropriately according to the requirements.

Based on the configuration of the above components, the control unit 150 of the present invention can drive the movable gate 160 to open or close the secondary air outlet E6 according to the load status of the heat sources 20, 30, so as to achieve the required heat dissipation effect in an efficient manner, as will be described later.

Fig. 4 and fig. 5 are schematic diagrams of the heat dissipation system of fig. 1 in different states. Referring to fig. 1, fig. 4 and fig. 5, since the first fan 110 and the second fan 120 of the present embodiment have the related characteristics of the airflow, the on/off states of the auxiliary air outlets E6 of the first fan 110 and the second fan 120 need to be adjusted corresponding to different load states of the heat sources 20 and 30, so as to optimize the operation efficiency of the heat dissipation system 100.

First, as shown in fig. 1, the heat sources 20 and 30 are all under low load, so the control unit 150 drives the movable gate 160 to close the respective sub-outlets E6 of the first fan 110 and the second fan 120, that is, in this state, it is sufficient that the first fan 110 and the second fan 120 dissipate the heat generated by the heat sources 20 and 30 with the air flow generated by the respective main outlets E5, that is, the first fan 110 and the second fan 120 can smoothly dissipate the heat generated by the heat sources 20 and 30 under low load with the air flow of a single outlet. Meanwhile, the noise generated by a plurality of air outlets can be avoided, and the comfort level of a user in operating the portable electronic device can be increased.

Next, as shown in fig. 4, the heat source 30 is at a high load and the heat source 20 is at a low load, so the control unit 150 drives the movable gate 160 at the second fan 120 to open the auxiliary air outlet E6 corresponding to the air outlet E4, so as to increase the airflow rate of the second fan 120, thereby facilitating heat dissipation for the heat source 30 with high load. At the same time, the first fan 110 and the movable gate 160 located therein remain in the state shown in fig. 1, so that unnecessary energy waste is avoided.

Conversely, when the heat source 30 is at a low load and the heat source 20 is at a high load, the movable shutter 160 of the first fan 110 is opened, and the movable shutter 160 of the second fan 120 is kept closed.

Next, as shown in fig. 5, when both the heat sources 20 and 30 are in the high-load state, the control unit 150 drives the two movable gates 160 to open the auxiliary air outlets E6 of the first fan 110 and the second fan 120, so that both the first fan 110 and the second fan 120 are in the dual-air-outlet heat dissipation state, thereby facilitating the heat dissipation of the heat sources 20 and 30.

Briefly, for a single fan (the first fan 110 or the second fan 120), if the airflow rate generated by opening only the main air outlet E5 is defined as 1 unit, and if the auxiliary air outlet E6 is added, the airflow rate can be increased by 20%, the total airflow rate of the main air outlet E5 and the auxiliary air outlet E6 is 1.2 units, and the airflow rate ratio of the main air outlet E5 to the auxiliary air outlet E6 is designed as: secondary outlet E6 airflow flow = 6:4, when the fan maintains the dual air-out state, the air flow rate of the main air outlet E5 is reduced to 0.72 units, and the air flow rate of the auxiliary air outlet E6 is reduced to 0.48 units. Therefore, based on the fan airflow characteristics, the control unit 150 can control the opening and closing states of the auxiliary air outlet E6 by driving the movable gate 160, so that the airflow can be effectively distributed and optimized. That is, on the premise of maintaining the internal space of the portable electronic device without increasing the number of fans, the heat dissipation efficiency and the operation flexibility of the heat dissipation system 100 can be effectively improved.

Fig. 6 is a schematic diagram of a heat dissipation system according to another embodiment of the present invention. Referring to fig. 6, in the present embodiment, the heat dissipation system 200 includes the second fan 120 and the heat pipes 241, 243, which are equivalent to the arrangement of the second fan 120 on the right side in the previous embodiment. The heat pipes 241 and 243 correspond to the portions of the first heat pipe 141 and the second heat pipe 142, and the heat pipe 241 has a heat absorbing section 241a in thermal contact with the heat source 20, a heat absorbing section 241b in thermal contact with the heat source 30, and a heat releasing section 241c in thermal contact with the heat radiation fin group 152, so that heat can be released from the heat sources 20 and 30 at the heat releasing section 241 c. The heat pipe 243 has a heat-absorbing section 243a in thermal contact with the heat source 30, a heat-releasing section 243b in thermal contact with the heat-dissipating fin group 152, and a heat-releasing section 243b in thermal contact with the heat-dissipating fin group 154, so as to absorb heat from the heat source 30 and then dissipate heat in the heat-releasing sections 243b and 243c, respectively. In other words, the present invention can perform the air distribution and efficiency improvement of the heat dissipation system 200 for the plurality of heat sources 20, 30 by using a single fan.

In summary, in the above embodiment of the present invention, the portable electronic device has a plurality of heat sources, the fan of the heat dissipation system has a main air outlet and an auxiliary air outlet, and the heat sources are heat dissipation fins thermally contacted to the main air outlet and the auxiliary air outlet by different heat pipes, and then the movable gate is used to control the opening and closing of the auxiliary air outlet, so as to form a bidirectional heat dissipation path or a unidirectional heat dissipation path. Therefore, the control unit can correspondingly open and close the auxiliary air outlet according to the respective load states of the heat source, and the bidirectional heat dissipation path or the unidirectional heat dissipation path is adopted as a heat dissipation means, so that different heat dissipation requirements can be met, and the heat dissipation system has the advantages of improving the heat dissipation efficiency and optimizing the operation efficiency.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. A heat dissipation system adapted for a portable electronic device having two heat sources, the heat dissipation system comprising:

the fan is a centrifugal fan and is provided with a main air outlet and an auxiliary air outlet;

the two radiating fin groups are respectively arranged at the main air outlet and the auxiliary air outlet;

the movable gate is arranged at the auxiliary air outlet;

the first heat pipe is in thermal contact with the two heat sources and is in thermal contact with the radiating fin group positioned at the main air outlet;

a second heat pipe in thermal contact with one of the two heat sources and in thermal contact with the two heat dissipation fin groups; and

the control unit is electrically connected with the movable gate and drives the movable gate to open or close the auxiliary air outlet according to the loads of the two heat sources.

2. The heat dissipation system according to claim 1, further comprising two temperature sensors disposed beside the two heat sources and not affecting each other, so as to sense the temperatures of the two heat sources, wherein the two temperature sensors are electrically connected to the control unit, and the control unit drives the movable gate to open or close the auxiliary air outlet according to the temperature sensing values of the two temperature sensors.

3. The heat dissipating system of claim 1, wherein the airflow rate of the fan when the primary air outlet and the secondary air outlet are both open is 120% of the airflow rate of the fan when the primary air outlet is open and the secondary air outlet is closed, with the same fan blade rotation speed.

4. The heat dissipation system of claim 1, wherein the primary air outlet has an airflow rate of: airflow flow rate of the secondary air outlet=6: 4.

5. the heat dissipation system of claim 1, wherein the two heat sources comprise a central processor and a display chip, the second heat pipe being in thermal contact with the central processor.

6. The heat dissipating system of claim 1 further comprising a third heat pipe, another fan, another movable gate and another two heat dissipating fin groups, said another two heat dissipating fin groups being located at a primary air outlet and a secondary air outlet of said another fan, respectively, said another movable gate being located at said secondary air outlet of said another fan, said third heat pipe being in thermal contact with another one of said two heat sources and said another two heat dissipating fin groups, said first heat pipe being in thermal contact with said heat dissipating fin groups located at said primary air outlet of said another fan, said another movable gate being electrically connected to said control unit, said control unit driving said another movable gate to open or close said secondary air outlet of said another fan in accordance with heat output of said two heat sources.

7. The heat dissipation system of claim 6, wherein the two heat sources are located between the fan and the other fan.

8. The heat dissipation system of claim 6, wherein the two heat sources comprise a central processing unit and a display chip, the third heat pipe being in thermal contact with the display chip.

9. The heat dissipating system of claim 1, wherein the portable electronic device comprises a housing, the heat dissipating system is adapted to be disposed in the housing, wherein the primary air outlet is located at a rear side of the housing, the secondary air outlet is located at a side of the housing, and a user operates the portable electronic device from a front side of the housing, the front side and the rear side being opposite to each other.

10. The heat dissipating system of claim 9, wherein the housing has a plurality of air outlets corresponding to the primary air outlet and the secondary air outlet, respectively.