TWI721498B - Smart chassis cooling system - Google Patents

Abstract

A smart chassis cooling system, specifically a smart cooling system that is installed in an outdoor telecom chassis and is can automatically select different cooling modes. The system may include a temperature sensor, a control unit, an external circulation cooling unit, an interval circulation cooling unit, and an alarm unit. In a general state, the system uses a fan included in the external circulation cooling unit to draw outside cold air into the chassis for performing an external circulation cooling mode, and a rotation speed of the fan can be automatically adjusted according to temperature inside the chassis so as to achieve power saving purposes. When the external cooling mode of the chassis fails, the system can automatically switch to an interval circulation cooling mode and send an alarm signal. The interval circulation cooling unit can forcibly generate cooling airflow in the chassis to achieve rapid cooling effect, so as to avoid equipment failure caused by overheating of the chassis.

Description

Chassis intelligent cooling system

The present invention relates to a heat dissipation system, and particularly relates to a chassis intelligent heat dissipation system suitable for outdoor telecommunications chassis.

In line with the development and construction of broadband networks, outdoor telecom boxes are equipped with a larger amount of heat-generating transmission equipment inside, which causes excessive heat load in the box. Coupled with increasingly hot environmental factors, it is easy to cause high-temperature degradation and failure of the equipment in the box. problem. Based on the dual considerations of high heat dissipation effect and low energy consumption, various outdoor telecommunications enclosures are used to dissipate heat, and most of them use an open external circulation heat dissipation mode, which uses a fan to suck in outside cold air through the air inlet to achieve the purpose of cooling the equipment. The hot air in the case is discharged to the outside through the air outlet. However, with the increasingly serious environmental pollution and warming problems, the air inlet filter of the chassis is more and more likely to be seriously blocked by dust or other pollutants, so that the outside cold air cannot enter the chassis and the external circulation cooling mode completely loses its function, resulting in high temperature. Mechanical damage and thermal crashes in the environment seriously affect the stability and service life of the equipment.

Due to the large number of outdoor telecommunications cabinets, and some remote or inconvenient maintenance, related maintenance work is actually difficult to repair in time. In view of this, the industry needs a method that can overcome the high temperature damage caused by the failure of the external circulation heat dissipation system of the outdoor enclosure equipment.

In order to overcome the problem of high temperature damage caused by the failure of the external circulation heat dissipation system of outdoor chassis equipment, the present invention actively researches to improve and innovate in response to the above needs, and finally breaks through the traditional old chassis heat dissipation structure, and develops the intelligent chassis heat dissipation of the present invention. system.

The purpose of the present invention is to provide an intelligent heat dissipation system for the chassis, which can automatically adjust the fan speed according to the temperature inside the chassis under the external circulation heat dissipation mode, so that the chassis is always kept within an ideal temperature range, so as to achieve the purpose of energy saving.

Another object of the present invention is to provide an intelligent heat dissipation system for a chassis, which can automatically switch to a circulating heat dissipation mode in the chassis and generate a cooling air flow when the outer circulation heat dissipation mode of the chassis fails, so as to achieve a rapid heat dissipation and temperature reduction effect, and avoid high temperature damage and heat. machine.

According to the above objective of the present invention, an intelligent heat dissipation system for a chassis is provided, which includes a temperature sensor, a control unit, an outer circulation heat dissipation unit, and an inner circulation heat dissipation unit. The control unit is connected with the temperature sensor, the outer circulation heat dissipation unit and the inner circulation heat dissipation unit. The control unit selectively controls the outer circulation heat dissipation unit and the inner circulation heat dissipation unit according to the temperature signal generated by the temperature sensor.

The above-mentioned outer circulation heat dissipation unit includes a first fan and a pulse width modulation (pulse width modulation, PWM) DC speed controller, wherein the first fan is configured to be used alone or in parallel with other fans, and the first fan A maximum wind pressure value is at least greater than 20 mm water column.

The above-mentioned first fan is a DC four-wire fan, and the four wires of the DC four-wire fan include a power supply positive line, a power supply negative line, a pulse width modulation pulse width speed control control line, and a speed signal line.

The above-mentioned PWM DC speed regulator is connected to the first fan to regulate the duty cycle and rotation speed of the first fan.

The aforementioned internal circulation heat dissipation unit includes a refrigeration chip, a second fan, a heat conduction device, and a third fan.

The distance between the aforementioned cooling chip and the second fan is between 2.5 cm and 5.0 cm.

One end of the heat-conducting device is connected to the refrigeration chip inside the case, and the other end of the heat-conducting device extends to the outside of the case and is connected to the third fan.

The material of the heat conducting device mentioned above is composed of at least one of copper and aluminum.

The above-mentioned heat conduction device is integrally molded or formed by a combination of a plurality of plates and heat pipes.

The above-mentioned chassis intelligent heat dissipation system further includes an alarm unit. The alarm unit is connected to the control unit. The alarm unit sends out an alarm message when the temperature inside the cabinet reaches a preset value.

Based on the above, the intelligent heat dissipation system for the chassis of the present invention can shut down the heat dissipation unit and start the outer loop in response to the temperature in the chassis rising to the set value by the control unit when the outer loop heat dissipation unit loses its heat dissipation function due to the severe blockage of the filter or the fan failure. Internal circulation cooling unit. In this way, the problem of high temperature failure caused by the failure of the chassis to be repaired in time is solved.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

FIG. 1 is a schematic structural diagram of a chassis intelligent heat dissipation system 10 according to an embodiment of the present invention. Please refer to FIG. 1, the chassis intelligent heat dissipation system 10 of the present invention is suitable for controlling the temperature of a chassis (for example, the chassis 600 shown in FIG. 2 ). It includes a temperature sensor 100, a control unit 200, an alarm unit 300, an outer circulation heat dissipation unit 400, and an inner circulation heat dissipation unit 500.

The temperature sensor 100 is used to detect the temperature inside the cabinet 600 and can output a temperature signal corresponding to the temperature inside the cabinet to the control unit 200.

The control unit 200 is connected to the temperature sensor 100, the alarm unit 300, the outer circulation heat dissipation unit 400, and the inner circulation heat dissipation unit 500. The control unit 200 is, for example, a central processing unit (CPU), or other programmable general-purpose or special-purpose micro control unit (MCU), microprocessor, or digital signal processing Digital signal processor (DSP), programmable controller, application specific integrated circuit (ASIC), graphics processing unit (GPU), arithmetic logic unit (ALU) , Complex programmable logic device (CPLD), field programmable gate array (FPGA) or other similar components or a combination of the above components.

The control unit 200 determines whether to start the outer circulation heat dissipation unit 400 or the inner circulation heat dissipation unit 500 according to the temperature signal detected by the temperature sensor 100, and when the temperature inside the case 600 reaches a preset value, the alarm unit 300 is notified to issue Warning message to the user. In actual application, the temperature sensor 100 can be a single or multiple ones, and can be respectively arranged in different positions in the chassis 600.

The alarm unit 300 is used to output an alarm message when the temperature inside the cabinet 600 reaches a preset value, so as to notify the user that the temperature inside the cabinet 600 is too high. In addition to wired transmission of the alarm message, wireless transmission can also be selected to facilitate the use of portable devices such as Bluetooth and radio frequency transmission. The present invention is not limited to this. For example, the alarm unit 300 can send the alarm message to the server that manages the chassis 600 via the network, and the server then outputs the alarm message to the user through the output device. In one embodiment, the alarm unit 300 is, for example, an output device of a type such as a display, a warning light, or a speaker, and can issue a warning to the user when the temperature inside the cabinet 600 is too high.

The external circulation heat dissipation unit 400 reduces the temperature inside the cabinet 600 through an air circulation mechanism corresponding to the outside of the cabinet 600. The internal circulation heat dissipation unit 500 reduces the temperature in the cabinet 600 by corresponding to the air circulation mechanism inside the cabinet 600.

FIG. 2 is a schematic diagram of the use state of the outer circulation heat dissipation unit 400 according to an embodiment of the present invention. Please refer to Figure 2. If the temperature value sent by the temperature sensor 100 inside the chassis 600 to the control unit 200 is lower than the preset value, the control unit 200 will choose to start the outer circulation heat dissipation unit 400 to remove the outside cold air. A is sucked into the chassis 600 through the air inlet 610 and the filter 630, and then the hot air B of the chassis is discharged through the air outlet 620 to achieve the purpose of heat dissipation of the chassis. In a preferred embodiment of the present invention, the preset value is 50°C. If the temperature inside the cabinet 600 does not exceed 50°C, it means that the thermal load of the cabinet 600 can be effectively controlled by means of external circulation heat dissipation.

The outer circulation heat dissipation unit 400 further includes a PWM DC speed regulator 410 and a first fan 420. The PWM DC speed controller 410 changes the duty cycle of the first fan 420 under the condition that the frequency is unchanged, so that the overall voltage value rises or falls. The PWM DC speed controller 410 can control the rotation speed of the first fan 420 through intermittent voltage switching. For example, if the duty cycle is 100%, it means that the first fan 420 runs at full speed at the highest power. Conversely, if the duty cycle is 0%, it means that the first fan 420 stops running. When the heat load of the chassis 600 increases and the temperature inside the chassis 600 is higher, the first fan 420 dissipates heat at a higher speed. If the temperature inside the case 600 is low, the first fan 420 reduces the speed to achieve energy saving effect. In actual application, the first fan 420 can be used alone or in parallel with other (plural) fans, but the maximum air pressure value of the first fan 420 is at least greater than 20 mm water column to ensure that it can overcome the wind resistance of the chassis runner In order to generate sufficient heat dissipation effect, the temperature inside the cabinet 600 is lower than the preset value (for example, 50° C.). In a preferred embodiment of the present invention, the first fan 420 is used alone, and its maximum air volume value is between 200 and 300 cubic feet per minute, and the maximum air pressure value is between 25 and 35 mm water column.

The first fan 420 is, for example, a DC four-wire fan, and the four wires of the DC four-wire fan may include a power supply positive line, a power supply negative line, a PWM pulse width speed control line, and a rotation speed signal line. The PWM DC speed controller 410 can analyze the temperature signal from the control unit 200 and the PWM speed control command set by the control unit 200 to generate a corresponding pulse signal to control the duty cycle and speed of the ground fan 420. Since the rotation speed of the first fan 420 can be automatically adjusted according to the temperature inside the case 600, the purpose of saving electricity can be achieved.

FIG. 3 is a schematic diagram of the use state of the internal circulation heat dissipation unit 500 according to an embodiment of the present invention. Those who are familiar with this art know that if the filter of the chassis 600 is severely blocked and becomes an abnormal filter 640, the outside cold air (outside cold air A shown in Figure 2) will not be able to enter and exit through the air inlet 610 and the air outlet 620. As a result, the case 600 will inevitably cause the failure of the outer circulation heat dissipation unit 400 and the temperature inside the case 600 will increase. In a preferred embodiment of the present invention, when the temperature inside the cabinet 600 rises to a preset value (for example, 50° C.), the control unit 200 selects to activate the internal circulation heat dissipation unit 500 to perform forced cooling.

The composition of the internal circulation heat dissipation unit 500 includes a second fan 510, a cooling chip 520, a heat conduction device 530 and a third fan 540. The cooling chip 520 is, for example, a thermoelectric cooler (TEC), but the present invention is not limited thereto. The refrigerating chip 520 has a uniform cold surface 521 and a uniform hot surface 522. The refrigerating chip 520 is arranged inside the case 600 and is connected to the heat conducting device 530. There is a communicating inlet and outlet between the refrigerating surface 521 and the second fan 510, so that the hot air flow C in the chassis 600 is sucked by the second fan 510 to contact the refrigerating surface 521 to cool down and become a cold air flow D.

The air outlet surface 511 of the second fan 510 faces the center of the chassis 600 so as to blow the cold airflow D toward the devices in the chassis 600. The air inlet surface 512 of the second fan 510 and the cooling surface 521 maintain a certain distance, preferably, for example, between 2.5 cm and 5.0 cm. If the distance between the air inlet surface 512 and the refrigerating surface 521 is too small, a larger wind resistance will be generated, which will affect the hot air flow C entering the center of the chassis 600. On the contrary, when the above distance is too large, the distance from the refrigerating surface 521 is too far to affect the temperature of the cold airflow D. The hot air flow C generated in the chassis 600 is cooled by the refrigerating surface 521 to become a cold air flow D, and then blown to the equipment in the chassis 600 through the air outlet surface 511 of the second fan 510, and finally forms an internal area that forcibly generates cold air. Circulating cooling system. Through the above-mentioned operation mechanism of inhaling the hot air flow C and then discharging the cold air flow D, the internal circulation heat dissipation effect can be achieved. The heat generated by the heating surface 522 is transferred to the outside of the chassis 600 through the heat conducting device 530, and the heat dissipation effect is accelerated by the third fan 540 disposed outside the chassis 600.

The waste heat generated by the work of the refrigerating chip 520 is transferred to the outside of the chassis 600 through the heat conducting device 530 that is in close contact with the heating surface 522, so as to prevent the heating surface 522 from being too high in temperature and causing the refrigerating chip 520 to malfunction or The cooling efficiency of the cooling chip 520 is affected. The heat conducting device 530 passes through the channel 550 provided on the back plate of the chassis 600 and utilizes the third fan 540 to assist in heat dissipation. The material of the heat-conducting device 530 is selected from one or a combination of copper or aluminum, and may be integrally molded or formed by a combination of a plurality of fin-shaped plates and columnar bodies. In a preferred embodiment of the present invention, the heat conducting device 530 is a combination of a plurality of heat pipes, wherein the heat pipe is a sealed metal pipe. The inside of the heat conducting device 530 is evacuated and injected with easily volatilized working fluid. The two ends of the heat conducting device 530 are the evaporation end 531 and the condensation end 532 respectively. The evaporating end 531 of the heat conducting device 530 is in close contact with the heating surface 522 to absorb the heat, and the condensing end 532 is arranged outside the chassis 600 and uses the third fan 540 to dissipate heat. First, the working fluid in the heat conducting device 530 becomes gaseous because it absorbs a large amount of heat energy on the heating surface 522. Then, the gaseous working fluid is conveyed to the condensation end 532 and then condenses into a liquid state again, and releases the heat of condensation. Finally, the liquid working fluid is returned to the evaporation end 531 using the capillary principle to form a complete phase change cycle. Since the phase change cycle process continuously produces heat absorption in the box and heat dissipation outside the box, the heat conducting device 530 can discharge the heat in the box out of the box 600 to achieve the purpose of heat dissipation. The above-mentioned second fan 510 and third fan 540 may be conventional two-wire DC fans or AC fans.

In order to let those skilled in the art know the characteristics of the present invention more clearly, the following examples are given as examples. However, it should be understood that the following embodiments are for illustrative purposes only, and should not be construed as limitations of the embodiments of the present invention.

Comparative Example 1: First, provide an outdoor chassis (such as chassis 600). The chassis 600 is made of 304 stainless steel and is painted with beige polyester powder paint on the surface. The length and height of the chassis are both 120 cm and the width is 48 cm. The case 600 is provided with an external circulation heat dissipation system, and the external circulation heat dissipation system includes an axial fan and a filter screen. An air outlet 620 required for heat dissipation is attached to the top of the chassis 600. The interior of the case 600 uses an incandescent lamp to provide a heat source of 750 W to simulate the heat storage generated by the equipment of the case and the radiant heat absorbed by sunlight, and a temperature sensor 100 is provided to record the temperature change inside the case after the heat source is heated. The first fan 420 of this comparative example can be three axial fans used in parallel, and the maximum air volume of each fan is 105 cubic feet per minute, and the maximum air pressure is 7.4 mm water column. Special attention is paid to the fact that the filter of this comparative example (for example: the filter 630 as shown in Figure 2 or the abnormal filter 640 as shown in Figure 3) uses two different filters: a clean filter and a clogged filter. The clogged filter is filled with a large amount of dust to clean the filter to simulate the effect of long-term air pollution. Then, the case 600 was placed in a 35°C constant temperature box to simulate the high temperature environment in summer. Then, after the heat source of the chassis is turned on, the temperature inside the chassis 600 is measured and recorded.

Figure 4 is a graph showing the internal temperature curve of an external circulation cooling system using different filters. Fig. 4 is a graph of the internal temperature curve of the case of an external circulation cooling system using the above two different filters (ie: clean filter 41 and clogged filter 42). As shown in Figure 4, the temperature inside the cabinet 600 after 30 minutes of heating by the heat source is compared. The temperature of the clean filter 41 is 50.7℃, while the temperature of the cabinet with the clogged filter 42 is as high as 63.7℃, which is higher than the former. 13°C higher. This result shows that when the filter is contaminated, in addition, the circulating heat dissipation system is susceptible to adverse effects, which may cause the temperature of the chassis 600 to increase significantly.

Embodiment 1: First of all, provide an outdoor case (for example: case 600), heat source and filter which is the same as that of Comparative Example 1. Then, the chassis intelligent heat dissipation system 10 as shown in FIG. 1 is installed inside the chassis 600, wherein the chassis intelligent heat dissipation system 10 can dissipate the outdoor type chassis according to the method shown in FIG. FIG. 5 is a flowchart of an intelligent control method according to an embodiment of the present invention, wherein the intelligent control method can be implemented by the chassis intelligent heat dissipation system 10 shown in FIG. 1. In step S501 of the intelligent control method, the control unit 200 uses the temperature sensor 100 inside the chassis 600 to perform temperature detection, and in step S502 determines whether the highest temperature data detected by the temperature sensor 100 exceeds 50°C . If the maximum temperature data exceeds 50°C, step S514 is entered. If the maximum temperature data does not exceed 50°C, step S503 is entered. The maximum temperature data that does not exceed 50° C. indicates that the thermal load of the chassis 600 and the heat output of the external circulation heat dissipation unit 400 can reach a reasonable balance, and the forced cooling function of the refrigerating chip 520 is not required. Therefore, the chassis intelligent heat dissipation system 10 selects to enter the outer circulation heat dissipation mode, and starts the first fan 420 of the circulation heat dissipation unit 400 outside of FIG. 2 in step S504. After that, in step S505, the chassis intelligent heat dissipation system 10 activates the PWM DC speed regulator 410 to adjust the duty cycle or rotation speed of the first fan 420. Specifically, the PWM DC speed controller 410 can determine how to adjust the rotation speed of the first fan 420 according to the temperature inside the case 600. If the control unit 200 determines in step S506 that the temperature inside the enclosure 600 is lower than 25° C., it means that there is no need to dissipate the enclosure 600 at all. Therefore, the chassis intelligent heat dissipation system 10 will terminate all heat dissipation operations.

Specifically, in step S507, the control unit 200 sets the duty cycle of the first fan 420 to 0%, that is, stops the operation of the first fan 420. When the control unit 200 determines in step S508 that the temperature inside the enclosure 600 has risen to between 25°C and 35°C, the PWM DC speed regulator 410 adjusts the duty cycle of the first fan 420 to 40% in step S509. At this time, the first fan 420 runs at a low speed with a lower voltage. When the control unit 200 determines in step S510 that the temperature inside the enclosure 600 continues to rise to between 35°C and 45°C, the PWM DC speed regulator 410 increases the duty cycle of the first fan 420 to 80% in step S511. At this time, the first fan 420 is running at a high speed and uses a larger wind pressure and air volume to improve the heat dissipation capacity. When the control unit 200 determines in step S512 that the temperature inside the chassis 600 continues to rise to more than 45°C, the PWM DC governor 410 fixes the duty cycle of the first fan 420 to 100% in step S512, and at this time, the first The fan 420 runs at full speed to enhance heat dissipation. In this way, the rotation speed of the first fan 420 changes with the heat dissipation demand, which not only saves energy, but also adjusts the wind pressure of the first fan 420 to overcome the filter screen (for example: the filter screen shown in FIG. 2 and FIG. 3) 630 or abnormal filter 640) blockage caused by wind resistance.

The case (for example: case 600) of Example 1 is placed in a 35° C. thermostat to simulate a high temperature environment in summer. Then, after starting the heat source of the case 600, the temperature inside the case 600 is measured and recorded. Fig. 6 is a graph of the internal temperature curve of the case of the outer circulation heat dissipation unit 400 using different filters according to an embodiment of the present invention, wherein the different filters are the same as the filters of Comparative Example 1 (ie: as shown in Fig. 4) Clean the filter 41 and block the filter 42). As shown in Fig. 6, the temperature inside the cabinet 600 after 30 minutes of heating by the heat source is compared. The temperature of the clean filter 41 used in Example 1 is 42.4°C, while the temperature of the plugged filter 42 is 46.2°C. The use of the clogging filter 42 only increases the temperature by 3.8°C. Compared with the increase of 13°C in the comparative example 1, the outer circulation heat dissipation unit 400 obviously has a better heat dissipation effect than the outer circulation heat dissipation system shown in FIG. 4. In other words, the external circulation heat dissipating unit 500 of the present invention is less susceptible to the adverse effects of clogging the filter, so it can effectively reduce the temperature in the cabinet 600 and keep the equipment in the cabinet 600 at an ideal operating temperature lower than 50°C. range.

Embodiment 2: First, provide an outdoor chassis (for example, chassis 600) identical to that of Embodiment 1, and install the chassis intelligent heat dissipation system 10 as shown in FIG. 1 inside the chassis 600. Then, the case 600 is placed in a 35° C. constant temperature box and the air inlet 610 of the case 600 is completely isolated to prevent outside air from entering, so as to simulate the failure of external circulation heat dissipation of the case 600 under the high temperature in summer. At this time, since the heat storage of the heat source in the case 600 cannot be dissipated, the temperature in the case 600 will continue to rise. Please refer to the process in Figure 5. When the temperature detected by the temperature sensor 100 exceeds 50°C, it means that the external circulation heat dissipation of the chassis 600 has failed, and the forced cooling function of the refrigeration chip 520 is needed for emergency heat dissipation. At this time, the control unit 200 may first notify the alarm unit 300 to send an alarm message to the user in step S514, and then in step S515, the chassis intelligent heat dissipation system 10 is converted from the original outer circulation heat dissipation mode to the inner circulation heat dissipation mode, and In steps S516, S517, and S518, the refrigeration chip 520, the second fan 510, and the third fan 540 of the circulating heat dissipation unit 500 as shown in FIG. 3 are sequentially activated. The temperature of the refrigerating surface 521 of the refrigerating chip 520 of this embodiment can reach below the freezing point. If the distance between the refrigerating surface 521 and the second fan 510 can be maintained, for example, between 2.5 cm and 5.0 cm, the hot air flow C sucked in by the second fan 510 can be quickly cooled to below room temperature to become a cold air flow D. Then, the second fan 510 can be used to blow the cold airflow D toward the heat source in the chassis 600 to achieve a rapid cooling effect. On the other hand, the third fan 540 and the heat-conducting device 530 are used to make the cooling chip 520 work The waste heat is guided to the outside of the chassis 600 and accelerates heat dissipation. In this way, not only can the temperature of the heating surface 522 of the refrigerating chip 520 be reduced to avoid thermal failure of the refrigerating chip 520, but also the cooling efficiency of the refrigerating chip 520 can be improved.

FIG. 7 is a graph of the internal temperature of the chassis 600 before and after the internal circulation heat dissipation unit 500 is activated according to an embodiment of the present invention. . As shown in Figure 7, the internal circulation heat dissipation unit 500 of the present invention starts immediately after the temperature (temperature curve 70) in the cabinet 600 exceeds 50°C (at time 71), and can remove the temperature of the cabinet 600 within 5 minutes. The temperature inside the box is reduced to 44°C to prevent high temperature problems caused by the failure of external circulation heat dissipation.

[Features and Effects]

Compared with other conventional technologies, the chassis intelligent heat dissipation system provided by the present invention has the following advantages:

1. The chassis intelligent heat dissipation system of the present invention can overcome the external circulation heat dissipation failure problem of the outdoor chassis, and can reduce the thermal damage and failure rate of the chassis equipment due to high temperature.

2. The chassis intelligent heat dissipation system of the present invention can adjust the heat dissipation operation according to actual needs, so that the chassis equipment can always be maintained in an ideal temperature range, and at the same time, the energy loss required for heat dissipation is minimized.

3. The chassis intelligent heat dissipation system of the present invention can alert immediately and quickly cool down, not only can prevent high temperature damage in the first time, but also provide maintenance personnel with more time to deal with the problem of external circulation heat dissipation failure, and optimize the maintenance of the telecommunications system quality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

10: Chassis intelligent cooling system 100: Temperature sensor 200: control unit 300: Alarm unit 41: clean filter 42: Abnormal filter 400: Outer circulation cooling unit 410: PWM DC speed regulator 420: The first fan 500: internal circulation cooling unit 510: The second fan 511: Out of the wind 512: Inlet side 520: Refrigeration chip 521: Chilled noodles 522: Heating Noodles 530: heat conduction device 531: Evaporating end 532: Condensing side 540: The third fan 550: Channel 600: Chassis 610: Air inlet 620: Air outlet 630: Filter 640: Abnormal Filter 70: Temperature curve 71: point in time A: outside cold air B: Chassis hot air C: Hot air flow D: cold air flow S501, S502, S503, S504, S505, S506, S507, S508, S509, S510, S511, S512, S513, S514, S515, S516, S517, S518: steps

FIG. 1 is a schematic structural diagram of a chassis intelligent heat dissipation system according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the use state of the outer circulation heat dissipation unit according to an embodiment of the present invention. FIG. 3 is a schematic diagram of the use state of the internal circulation heat dissipation unit according to an embodiment of the present invention. Figure 4 is a graph showing the internal temperature curve of an external circulation cooling system using different filters. Fig. 5 is a flowchart of an intelligent control method according to an embodiment of the present invention. Fig. 6 is a graph showing the internal temperature curve of the case in which different filters are used in the outer circulation heat dissipation unit according to an embodiment of the present invention. Fig. 7 is a graph of the internal temperature of the chassis before and after the internal circulation heat dissipation unit is activated according to an embodiment of the present invention.

10: Chassis intelligent cooling system 100: Temperature sensor 200: control unit 300: Alarm unit 400: Outer circulation cooling unit 500: internal circulation cooling unit

Claims (10)

A chassis intelligent heat dissipation system is suitable for a chassis and includes a temperature sensor; an outer circulation heat dissipation unit, wherein the outer circulation heat dissipation unit includes a first fan and a pulse width modulated DC speed controller, wherein the pulse width The modulated DC speed controller is connected to the first fan to regulate the duty cycle of the first fan; an inner circulation heat dissipation unit; and a control unit connected to the temperature sensor, the outer circulation heat dissipation unit and the inner circulation A heat dissipation unit, the control unit selectively controlling the outer circulation heat dissipation unit and the inner circulation heat dissipation unit according to a temperature signal generated by the temperature sensor, wherein the control unit indicates that the temperature does not exceed a temperature threshold in response to the temperature signal The outer loop heat dissipation unit is selected to perform heat dissipation, and the duty cycle of the first fan is adjusted according to the temperature. The control unit selects and controls the inner loop heat dissipation unit in response to the temperature signal indicating that the temperature exceeds the temperature threshold. Heat dissipation. According to the intelligent heat dissipation system of the chassis described in the scope of patent application 1, the first fan is configured to be used alone or in parallel with other fans, and a maximum wind pressure value of the first fan is at least greater than 20 mm water column. As described in item 2 of the scope of patent application, the chassis intelligent heat dissipation system, wherein the first fan is a direct-flow four-wire fan, and the four-wire DC four-wire fan Including power supply positive line, power supply negative line, pulse width modulation pulse width speed control control line and speed signal line. As described in the second item of the scope of patent application, the chassis intelligent heat dissipation system, wherein the pulse width modulated DC speed controller is connected to the first fan to regulate the rotation speed of the first fan. As described in the first item of the scope of patent application, the internal circulation heat dissipation unit includes a uniform cooling chip, a second fan, a heat conduction device, and a third fan. According to the intelligent heat dissipation system of the chassis described in item 5 of the scope of patent application, the distance between the cooling chip and the second fan is between 2.5 cm and 5.0 cm. For the intelligent heat dissipation system of the chassis as described in item 5 of the scope of patent application, one end of the heat conduction device is inside the chassis and is connected to the refrigeration chip, and the other end of the heat conduction device extends to the outside of the chassis and Connect with the third fan. As described in item 5 of the scope of patent application, the material of the heat-conducting device is composed of at least one of copper and aluminum. As described in item 5 of the scope of the patent application, the heat-conducting device is an integral molding casting or a combination of a plurality of plates and heat pipes. For example, the intelligent heat dissipation system of the chassis as described in item 1 of the scope of patent application, further includes: an alarm unit connected to the control unit, and the alarm unit is in the box of the chassis When the temperature reaches the preset value, an alarm message will be issued.

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