CN109820505B - Fan radiating device and control method thereof - Google Patents
Fan radiating device and control method thereof Download PDFInfo
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- CN109820505B CN109820505B CN201910103091.4A CN201910103091A CN109820505B CN 109820505 B CN109820505 B CN 109820505B CN 201910103091 A CN201910103091 A CN 201910103091A CN 109820505 B CN109820505 B CN 109820505B
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Abstract
The invention provides a fan radiating device and a control method thereof. The fan heat abstractor includes shroud, temperature detection part, first processing module, main control circuit, second processing module, fan and ventilation pipe. The main control circuit is in communication connection with the first processing module, receives the temperature of the electronic component fed back by the first processing module, judges whether the temperature of the electronic component is higher than a normal working temperature range, and generates a fan rotation speed regulating instruction when the temperature of the electronic component is higher than the normal working temperature range. The second processing module is in communication connection with the main control circuit and is used for receiving the fan rotating speed regulating and controlling instruction sent by the main control circuit and generating a driving signal according to the fan rotating speed regulating and controlling instruction. The fan is electrically connected with the second processing module and is used for adjusting the rotating speed of the fan according to the driving signal so as to accelerate the ventilation in the cover cap, thereby improving the cooling effect and keeping the temperature of the electronic component within the normal working temperature range.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a fan radiating device and a control method thereof.
Background
In medical imaging systems, some of the electronic components generate high temperatures during operation, requiring heat dissipation to maintain their proper operation. For example, in a magnetic resonance (Magnetic Resonance, MR) system, a strong magnetic field exists between scans, i.e., where a superconducting magnet is located, and the system includes a plurality of electronic components, wherein a part of components mounted on the superconducting magnet side have large power consumption, generate a large amount of heat, and an excessive temperature affects the accuracy of the electronic components, so that the electronic components on the superconducting magnet side are radiated.
At present, the method for radiating the electronic component on the superconducting magnet side of the MR system mainly comprises a natural radiating method and a water cooling radiating method. Natural heat dissipation is generally used for lower power consumption components without additional cost. The water cooling method is generally used for parts with higher power consumption, and has the advantages of good cooling performance, high cooling speed, high power consumption, troublesome installation, high price and the like.
Disclosure of Invention
Based on this, it is necessary to provide a fan heat dissipation device and a control method thereof for solving the heat dissipation problem of electronic components of a medical imaging system.
The invention provides a fan heat dissipation device, comprising:
a cover for enclosing electronic components of the medical imaging system, the cover being provided with at least one vent on each of opposite sides;
a temperature detection member provided in the cover for detecting a temperature of the electronic component;
the first processing module is arranged in the cover cap and is used for monitoring and feeding back the temperature of the electronic component detected by the temperature detection component;
the main control circuit is in communication connection with the first processing module, receives the temperature of the electronic component fed back by the first processing module, judges whether the temperature of the electronic component is higher than a normal working temperature range, and generates a fan rotating speed regulating instruction when the temperature of the electronic component is higher than the normal working temperature range; and
the second processing module is in communication connection with the main control circuit and is used for receiving the fan rotating speed regulating and controlling instruction sent by the main control circuit and generating a driving signal according to the fan rotating speed regulating and controlling instruction;
the fan is electrically connected with the second processing module and is used for adjusting the rotating speed of the fan according to the driving signal; and
and the first end of the ventilation pipe is communicated with the ventilation hole on one surface of the cover, and the second end of the ventilation pipe is connected with the air outlet of the fan.
In one embodiment, the fan rotation speed regulation command is a pulse width modulation signal;
the second processing module is also used for monitoring the rotating speed of the fan and feeding back the rotating speed of the fan to the main control circuit;
the main control circuit calculates a fan rotating speed attenuation value according to the rotating speed of the fan and the duty ratio of the fan rotating speed regulation command, judges whether the fan rotating speed attenuation value is larger than an attenuation value threshold, judges that the fan breaks down when the fan rotating speed attenuation value is larger than the attenuation value threshold, and generates first prompt information for prompting that the fan breaks down.
In one embodiment, the bottom and top of the cover are each provided with a plurality of vent holes.
In one embodiment, the fan heat dissipation device further comprises a base matched with the cover, a cavity is formed by the bottom of the cover and the base, an air inlet is formed in one side face of the base, and the base is connected with the first end of the ventilation pipe through the air inlet.
In one embodiment, the fan heat dissipation device further includes:
the first wind speed sensor is arranged at the air inlet of the base and is used for detecting the first wind speed of the air inlet of the base; and
the second wind speed sensor is arranged at the air outlet of the fan and used for detecting the second wind speed of the air outlet of the fan.
In one embodiment, the fan heat dissipation device further includes:
the dustproof net is arranged at the air inlet of the fan and used for preventing external dust from entering the fan;
the first processing module is also used for monitoring a first wind speed measured by the first wind speed sensor and feeding back the first wind speed to the main control circuit;
the second processing module is also used for monitoring a second wind speed measured by the second wind speed sensor and feeding the second wind speed back to the main control circuit;
the main control circuit is further configured to calculate an attenuation value of the first wind speed according to the first wind speed and the second wind speed, determine whether the attenuation value of the first wind speed is greater than the attenuation value threshold, determine that the ventilation pipe fails when the attenuation value of the first wind speed is greater than the attenuation value threshold, generate second prompting information for prompting that the ventilation pipe fails, calculate an attenuation value of the second wind speed according to the second wind speed and the rotation speed of the fan, determine whether the attenuation value of the second wind speed is greater than the attenuation value threshold, determine that dust needs to be removed from the dust screen when the attenuation value of the second wind speed is greater than the attenuation value threshold, and generate third prompting information for prompting that dust needs to be removed from the dust screen.
Based on the same inventive concept, the invention also provides a control method of the fan heat dissipation device, comprising the following steps:
receiving a temperature of an electronic component of the in-hood medical imaging system monitored and fed back by the first processing module;
judging whether the temperature of the electronic component is higher than a normal working temperature range;
and if the temperature of the electronic component is higher than the normal working temperature range, generating a fan rotating speed regulating instruction, and sending the fan rotating speed regulating instruction to a second processing module, so that the second processing module generates a driving signal for regulating the rotating speed of the fan according to the fan rotating speed regulating instruction.
In one embodiment, the fan rotation speed regulation command is a pulse width modulation signal, and the control method further includes:
receiving the rotating speed of the fan monitored and fed back by the second processing module;
calculating a fan rotating speed attenuation value according to the rotating speed of the fan and the duty ratio of the fan rotating speed regulating instruction;
judging whether the fan rotating speed attenuation value is larger than an attenuation value threshold value or not;
and when the fan rotating speed attenuation value is larger than the attenuation value threshold value, generating first prompting information for prompting that the fan fails.
In one embodiment, the control method further includes:
receiving a first wind speed of a base air inlet monitored and fed back by the first processing module and a second wind speed of the fan air outlet monitored and fed back by the second processing module;
calculating an attenuation value of the first wind speed according to the first wind speed and the second wind speed;
judging whether the attenuation value of the first wind speed is larger than the attenuation value threshold value or not;
if the attenuation value of the first wind speed is larger than the attenuation value threshold value, judging that the ventilation pipe breaks down, and generating second prompting information for prompting that the ventilation pipe breaks down.
In one embodiment, the control method further includes:
calculating an attenuation value of the second wind speed according to the second wind speed and the rotating speed of the fan;
judging whether the attenuation value of the second wind speed is larger than the attenuation value threshold value or not;
if the attenuation value of the second wind speed is larger than the attenuation value threshold value, judging that dust removal is needed to be carried out on the dust screen, and generating third prompt information for prompting that dust removal is needed to be carried out on the dust screen.
In summary, the invention provides a fan heat dissipation device and a control method thereof. The fan heat abstractor includes shroud, temperature detection part, first processing module, main control circuit, second processing module, fan and ventilation pipe. The cover is used for surrounding electronic components of the medical imaging system, and at least one ventilation hole is arranged on two opposite surfaces of the cover. The temperature detection component is arranged in the cover cap and is used for detecting the temperature of the electronic component. The first processing module is arranged in the cover cap and is used for monitoring and feeding back the temperature of the electronic component detected by the temperature detection component. The main control circuit is in communication connection with the first processing module, receives the temperature of the electronic component fed back by the first processing module, judges whether the temperature of the electronic component is higher than a normal working temperature range, and generates a fan rotation speed regulating instruction when the temperature of the electronic component is higher than the normal working temperature range. The second processing module is in communication connection with the main control circuit and is used for receiving the fan rotation speed regulating instruction sent by the main control circuit and generating a driving signal according to the fan rotation speed regulating instruction. The fan is electrically connected with the second processing module and is used for adjusting the rotating speed of the fan according to the driving signal. The first end of the ventilation pipe is communicated with the ventilation hole on one surface of the cover, and the second end of the ventilation pipe is connected with the air outlet of the fan. According to the invention, the temperature of the electronic component is detected by the temperature detection component, whether the temperature of the electronic component is higher than a normal working temperature range is judged by the main control circuit, and a fan rotating speed regulating instruction is generated when the temperature of the electronic component is higher than the normal working temperature range, so that the second processing module generates a driving signal for driving the fan to operate according to the fan rotating speed regulating instruction, and adjusts the rotating speed of the fan so as to increase the wind speed passing through the ventilation hole, accelerate the air circulation in the cover, and further achieve the effect of accelerating the cooling, so that the temperature of the electronic component is kept in the normal working temperature range.
Drawings
Fig. 1 is a schematic structural diagram of a fan heat dissipation device according to an embodiment of the present invention;
fig. 2 is an electrical schematic diagram of a fan heat dissipation device according to an embodiment of the present invention;
fig. 3 is a flow chart of a control method of a fan heat dissipation device according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Referring to fig. 1 and 2 together, an embodiment of the present invention provides a fan heat dissipation device, which includes a cover 100, a temperature detecting component 200, a first processing module 300, a main control circuit 400, a second processing module 500, a fan 600, and a ventilation pipe 700.
The cover 100 is used to enclose the electronic components of the medical imaging system, and at least one vent 110 is provided on each of the opposite sides of the cover 100.
The temperature detecting member 200 is provided in the cover 100 to detect the temperature of the electronic component.
The first processing module 300 is disposed in the cover 100, and is configured to monitor and feed back the temperature of the electronic component detected by the temperature detecting component 200.
The main control circuit 400 is in communication connection with the first processing module 300, receives the temperature of the electronic component fed back by the first processing module 300, determines whether the temperature of the electronic component is higher than a normal working temperature range, and generates a fan rotation speed regulation command when the temperature of the electronic component is higher than the normal working temperature range.
The second processing module 500 is in communication connection with the main control circuit 400, and is configured to receive the fan rotation speed regulation command sent by the main control circuit 400, and generate a driving signal according to the fan rotation speed regulation command.
The fan 600 is electrically connected to the second processing module 500, and is configured to adjust a fan rotation speed according to the driving signal.
A first end of the ventilation pipe 700 communicates with the ventilation hole 110 on one surface of the cover 100, and a second end of the ventilation pipe 700 is connected with an air outlet of the blower 600.
It will be appreciated that the number of vent holes on the face of the cover 100 that communicates with the vent tube 700 is greater than the number of vent holes on the other face of the cover 100 where vent holes are provided. Alternatively, the number of the ventilation holes on the surface of the cover 100, which is in communication with the ventilation pipe 700, is equal to the number of the ventilation holes on the other surface of the cover 100, in which the ventilation holes are provided, but the cross-sectional area of the ventilation holes is larger than that of the ventilation holes, so that the sum of the areas of the ventilation holes is larger than that of the ventilation holes, and the accumulation of wind in the cover is prevented, so that backflow is formed, and the heat dissipation effect is affected.
In this embodiment, the temperature detection unit 200 detects the temperature of the electronic component, and the master control circuit 400 determines whether the temperature of the electronic component is higher than a normal operating temperature range, and generates a fan rotation speed regulation command when the temperature of the electronic component is higher than the normal operating temperature range, so that the second processing module 500 generates a driving signal for adjusting the rotation speed of the fan 600 according to the fan rotation speed regulation command, and increases the air output of the fan 600, so as to increase the wind speed passing through the ventilation hole 110, accelerate the ventilation in the cover 100, and further achieve the effect of accelerating the cooling, so that the temperature of the electronic component is kept within the normal operating temperature range. In addition, in this embodiment, the fan 600 is externally arranged between devices, and is connected to the scanning member through the longer ventilation pipe 700 to radiate heat for the electronic components, so that noise generated between the scanning devices by the fan is avoided, comfort level of a patient during scanning is improved, and meanwhile, interference of the fan between the scanning devices can be avoided, so that image quality is affected.
In one embodiment, the fan heat dissipation device further includes a sound insulation box, configured to place the fan 600, and perform noise reduction treatment on the fan, so as to avoid that noise generated by the fan affects image quality. The sound insulation box is provided with a through hole, and the ventilation pipe penetrates through the through hole to be communicated with the fan and the ventilation hole on one surface of the cover.
It can be appreciated that the sound insulation box is provided in this embodiment, and the noise reduction processing can be performed on the fan by using the sound insulation box, so as to avoid the influence of noise generated by the fan on the image quality. The blower is also placed between the scans while reducing the length of the ventilation tube.
In one embodiment, a telescoping portion is provided between the first end of the vent tube and the second end of the vent tube. The length of the ventilation pipe can be changed at will by stretching or compressing the telescopic part, so that the distance between the fan and the cover cap can be adjusted at will according to the placement requirement in the installation process of the fan radiating device, and the length of the ventilation pipe is not required to be considered.
In one embodiment, the temperature detecting part 200 may be a temperature sensor by which the temperature of the electronic part is detected.
In one embodiment, the main control circuit 400 is further configured to determine whether the high temperature duration is greater than a preset time, and generate high temperature early warning information when the high temperature duration is greater than the preset time; wherein the high temperature duration is a time during which the temperature of the electronic component is continuously higher than the normal operating temperature range.
In this embodiment, assuming that the preset time is 3 minutes, when the high-temperature duration is determined to be greater than 3 minutes, the main control circuit 400 generates high-temperature early warning information to remind a user to suspend use or close the magnetic resonance system, so that the temperature of the electronic component falls back into the normal working temperature range, and burning out due to overhigh temperature is avoided. It is understood that the preset time may be set empirically or by the master control circuit 400 by itself, and is not limited to 3 minutes in the present embodiment.
In one embodiment, the fan speed regulation command is a pulse width modulation signal.
The second processing module 500 is further configured to monitor a rotation speed of the fan 600, and feed back the rotation speed of the fan 600 to the main control circuit 400;
the main control circuit 400 is further configured to receive a rotation speed of the fan 600, calculate a rotation speed attenuation value of the fan 600 according to the rotation speed of the fan 600 and a duty ratio of the fan rotation speed regulation command, determine whether the rotation speed attenuation value of the fan 600 is greater than an attenuation value threshold, determine that the fan 600 fails when the rotation speed attenuation value of the fan 600 is greater than the attenuation value threshold, and generate a first prompt message for prompting that the fan 600 fails.
It will be appreciated that the rotational speed of the blower 600 is related to the duty cycle of the pwm signal, and that the blower 600 rotates faster when the duty cycle of the pwm signal is greater. When the duty cycle of the pwm signal is small, the fan 600 rotates at a slow speed. Therefore, when the fan speed regulation command is a pulse width modulation signal, the speed of the fan 600 may be changed by increasing the duty cycle of the pulse width modulation signal.
And, the rotation speed of the fan 600 and the pwm signal have an approximately linear relationship in a certain frequency range: f=k×d, where K is a constant coefficient, F is the rotation speed of the fan 600, and D is the duty cycle of the fan rotation speed regulation command. Therefore, in this embodiment, when it is determined that the temperature of the electronic component is higher than the normal operating temperature range, the duty ratio of the pwm signal may be increased to increase the driving power of the fan, further increase the rotation speed of the fan 600, improve the heat dissipation effect of the fan heat dissipation device, and maintain the temperature of the electronic component within the normal operating range. In addition, when the temperature of the electronic component is lower than the normal operating temperature range, the duty cycle of the pwm signal can be reduced to reduce the rotation speed of the fan 600, thereby increasing the service life of the fan 600.
In one embodiment, the cover 100 is provided with a plurality of vents 110 at both the bottom and top. It can be appreciated that by providing a plurality of vent holes 110 at both the bottom and the top of the cover 100, heat can be dissipated through the plurality of vent holes 110, which is beneficial to improving the heat dissipation effect.
In one embodiment, the fan heat dissipation device further includes a base 800 disposed in a matching manner with the cover 100, a cavity is formed between the bottom of the cover 100 and the base 800, an air inlet is disposed on one side of the base 800, and the base 800 is connected to the first end of the ventilation pipe 700 through the air inlet.
It will be appreciated that the vent 700 and vent 110 may communicate in a variety of ways. For example, the air inlet of the ventilation pipe 700 may be fixed to the bottom or top of the cover 100, and the ventilation pipe 700 may be in direct communication with the ventilation hole 110. It is also possible to achieve indirect communication between the ventilation pipe 700 and the ventilation hole 110 by providing the base 800, through the base 800.
In this embodiment, by providing the base 800, the wind inputted from the ventilation pipe 700 first enters the cavity of the base 800, and then enters the cover 100 from the cavity of the base 800 through the ventilation holes 110 on the bottom surface of the cover 100, so that each ventilation hole 110 on the bottom surface of the cover 100 does not need to be directly communicated with the ventilation pipe 700. In this embodiment, the cross section of the ventilation pipe is circular, and for convenience of connection, the air inlet of the base is also circular. In addition, because the base is flat box-shaped structure, when the air inlet of base is circular, the size of air inlet is limited by the height of base, consequently in order to guarantee that the amount of wind is abundant, can also be according to actual need with the shape design of air inlet is oval, fan-shaped or shape such as rectangle to increase the cross-sectional area of the air inlet of base, increase the amount of wind that gets into the shroud, improve the radiating effect.
In addition, can be provided with a plurality of air intakes on the base, a plurality of air intakes set up on the different faces of base, with through a plurality of air intakes receive the ascending air inlet of each direction, reduce the temperature gradient of electronic component promotes the cooling effect. In the actual use process, one air inlet can be communicated with one fan, and a plurality of air inlets can also be communicated with one fan, so that the air quantity requirement in the working process is met. When the plurality of air inlets are communicated with one fan, one end of the ventilating pipe connected with the base can be designed to be in a shape comprising a plurality of branch pipes so as to be connected with each air inlet through the branch pipes.
In one embodiment, the fan heat sink further includes a first wind speed sensor 900 and a second wind speed sensor 1000. The first wind speed sensor 900 is disposed at an air inlet of the base 800, and is configured to detect a first wind speed of the air inlet of the base 800. The second wind speed sensor 1000 is disposed at an air outlet of the fan 600, and is configured to detect a second wind speed at the air outlet of the fan 600.
In this embodiment, by detecting the first wind speed of the air inlet of the base 800 by the first wind speed sensor 900 and detecting the second wind speed of the air outlet of the fan 600 by the second wind speed sensor 1000, the main control circuit 400 can determine whether the fan heat dissipating device has a fault according to the first wind speed and the second wind speed in the subsequent process.
In one embodiment, the fan heat dissipation device further includes a dust screen 1010, where the dust screen 1010 is disposed at an air inlet of the fan 600, and is used for preventing external dust from entering the fan 600.
The first processing module 300 is further configured to monitor a first wind speed measured by the first wind speed sensor 900, and feed back the first wind speed to the main control circuit 400.
The second processing module 500 is further configured to monitor a second wind speed measured by the second wind speed sensor 1000, and feed back the second wind speed to the main control circuit 400.
The main control circuit 400 is further configured to receive the first wind speed and the second wind speed, calculate an attenuation value of the first wind speed according to the first wind speed and the second wind speed, determine whether the attenuation value of the first wind speed is greater than the attenuation value threshold, determine that the ventilation pipe 700 malfunctions when the attenuation value of the first wind speed is greater than the attenuation value threshold, generate a second prompting message for prompting that the ventilation pipe 700 malfunctions, calculate an attenuation value of the second wind speed according to the second wind speed and the rotation speed of the fan 600, determine whether the attenuation value of the second wind speed is greater than the attenuation value threshold, determine that dust removal is required to be performed on the dust-proof net 1010 when the attenuation value of the second wind speed is greater than the attenuation value threshold, and generate a third prompting message for prompting that dust removal is required to be performed on the dust-proof net 1010.
It will be appreciated that, when the fan 600 operates at each rotational speed, there will be a duty cycle, a rotational speed of the fan 600, a first wind speed, and a second wind speed of the corresponding fan rotational speed control command, and the master control circuit 400 will record and store the duty cycle, the rotational speed of the fan 600, the first wind speed, and the second wind speed of the fan rotational speed control command in these several gear positions. The main control circuit 400 calculates the rotation speed attenuation value of the fan 600 according to the duty ratio of the fan rotation speed regulation command and the operation relation of the fan 600 rotation speed, and can judge whether the fan 600 has a fault. For example, when the rotational speed attenuation value of the fan 600 corresponding to the same duty cycle is attenuated to the attenuation value threshold (in this embodiment, the attenuation value threshold is 50%) or higher, the main control circuit 400 determines that the fan 600 is faulty, and needs to be overhauled, and generates a first prompt message for prompting that the fan 600 is faulty, so that a user can learn that the fan 600 is faulty in time. In addition, the ratio of the second wind speed to the first wind speed may be calculated, and the ratio may be compared with a preset ratio threshold value, so as to determine whether the fan 600 is faulty.
The attenuation value of the second wind speed is calculated according to the operation relation between the rotation speed of the fan 600 and the second wind speed, so that whether the dust screen 1010 of the fan 600 is blocked by accumulated dust can be judged. For example, when the attenuation value of the second wind speed corresponding to the same rotation speed of the fan 600 is attenuated to 50% or more, the main control circuit 400 determines that dust removal is required for the dust screen 1010, and generates third prompt information for prompting that dust removal is required for the dust screen 1010, so as to prompt the user to clean the dust screen 1010 in time.
According to the calculation of the attenuation value of the first wind speed according to the calculation relation between the first wind speed and the second wind speed, it may be determined whether the ventilation pipe 700 is abnormal (such as the interconnection is dropped, the ventilation pipe 700 is abnormally bent, the aperture is reduced due to softening, etc.), when the attenuation value of the first wind speed corresponding to the same second wind speed is attenuated to 50% or higher, the main control circuit 400 determines that the ventilation pipe 700 is faulty, and generates a second prompt message for prompting that the ventilation pipe 700 is faulty, so as to prompt the user that the ventilation pipe 700 is abnormal and needs to be overhauled. It will be appreciated that the attenuation value threshold may be set empirically or by the master circuit 400 itself, and is not limited to 50% in the above embodiment.
In one embodiment, the fan heat dissipation device further includes at least one single board 1020, the single board 1020 is disposed inside the cover 100, and the temperature detecting component 200 and the first processing module 300 are both fixed on the surface of the single board 1020. In the actual use process, a plurality of single boards can be inserted according to the requirement (the structure shown in fig. 1 can be inserted with 5 single boards at most).
In this embodiment, the fan heat dissipation device includes a plurality of single boards 1020, and the single boards 1020 are perpendicular to the bottom and the top of the cover and are disposed at equal intervals in the cover. And secondly, the coverage areas of the single plate at the top and the bottom of the cover cap are not overlapped with the coverage areas of the vent holes, so that part of the vent holes are not blocked, and the heat dissipation effect is not affected. In addition, except for the contact part of the top and the bottom of the cover cap and the single plate, the rest parts of the top and the bottom of the cover cap are hollowed out, so that the total area of the ventilation holes of the top and the bottom of the cover cap is increased, and the heat dissipation effect is improved.
Based on the same inventive concept, the invention also provides a control method of the fan heat dissipation device, referring to fig. 3, for the fan heat dissipation device in any embodiment, the control method includes:
step S310, receiving the temperature of the electronic components of the medical imaging system within the cover 100 monitored and fed back by the first processing module 300;
step S320, judging whether the temperature of the electronic component is higher than a normal working temperature range;
step S330, if the temperature of the electronic component is higher than the normal operating temperature range, generating a fan rotation speed regulation command, and sending the fan rotation speed regulation command to the second processing module 500, so that the second processing module 500 generates a driving signal for adjusting the rotation speed of the fan 600 according to the fan rotation speed regulation command.
In one embodiment, the fan rotation speed regulation command is a pulse width modulation signal, and the control method further includes:
receiving the rotational speed of the blower 600 monitored and fed back by the second processing module 500;
calculating a rotation speed attenuation value of the fan 600 according to the rotation speed of the fan 600 and the duty ratio of the fan rotation speed regulation command;
judging whether the rotating speed attenuation value of the fan 600 is larger than an attenuation value threshold value or not;
and when the rotating speed attenuation value of the fan 600 is larger than the attenuation value threshold, generating first prompt information for prompting that the fan 600 fails.
It will be appreciated that the rotational speed of the blower 600 is related to the actual power of the blower 600, and that the blower 600 is rotated faster when the actual power of the blower 600 is greater. When the actual power of the fan 600 is smaller, the fan 600 rotates at a slower speed. Therefore, when the fan rotation speed regulation command is a pulse width modulation signal, the driving power of the fan can be changed by changing the duty ratio of the pulse width modulation signal, so as to change the rotation speed of the fan 600, thereby achieving the purpose of improving or reducing the heat dissipation effect.
And, the rotation speed of the fan 600 and the pwm signal have an approximately linear relationship in a certain frequency range: f=k×d, where K is a constant coefficient, F is the rotation speed of the fan 600, and D is the duty cycle of the fan rotation speed regulation command. Therefore, in this embodiment, when it is determined that the temperature of the electronic component is higher than the normal operating temperature range, the duty ratio of the pwm signal may be increased to increase the driving power of the fan, further increase the rotation speed of the fan 600, improve the heat dissipation effect of the fan heat dissipation device, and maintain the temperature of the electronic component within the normal operating range. In addition, when the temperature of the electronic component is lower than the normal operating temperature range, the duty ratio of the pwm signal may be reduced to reduce the rotation speed of the fan 600, and reduce the heat dissipation effect of the fan 600, so that the temperature of the electronic component is increased to be within the normal operating range.
In addition, the main control circuit 400 calculates the rotation speed attenuation value of the fan 600 according to the duty ratio of the fan rotation speed regulation command and the operation relation of the fan 600 rotation speed, so as to determine whether the fan 600 has a fault. For example, when the rotational speed attenuation value of the fan 600 corresponding to the same duty cycle is attenuated to the attenuation value threshold (in this embodiment, the attenuation value threshold is 50%) or higher, the main control circuit 400 determines that the fan 600 is faulty, and needs to be overhauled, and generates a first prompt message for prompting that the fan 600 is faulty, so that a user can learn that the fan 600 is faulty in time. It will be appreciated that the attenuation value threshold may be set empirically or by the master circuit 400 itself, and is not limited to 50% in the above embodiment.
In one embodiment, the control method further includes:
receiving a first wind speed of an air inlet of the base 800 monitored and fed back by the first processing module 300, and a second wind speed of an air outlet of the fan 600 monitored and fed back by the second processing module 500;
calculating an attenuation value of the first wind speed according to the first wind speed and the second wind speed;
judging whether the attenuation value of the first wind speed is larger than the attenuation value threshold value or not;
if the attenuation value of the first wind speed is greater than the attenuation value threshold value, judging that the ventilation pipe 700 is in fault, and generating second prompt information for prompting that the ventilation pipe 700 is in fault.
It may be appreciated that, by calculating the attenuation value of the first wind speed according to the operational relationship between the first wind speed and the second wind speed, it may be determined whether the ventilation pipe 700 is abnormal (such as the interconnection is dropped, the ventilation pipe 700 is bent abnormally, the aperture is reduced due to softening, etc.), and when the attenuation value of the first wind speed corresponding to the same second wind speed is attenuated to 50% or higher, the main control circuit 400 determines that the ventilation pipe 700 is faulty, and generates a second prompt message for prompting that the ventilation pipe 700 is faulty, so as to prompt the user that the ventilation pipe 700 is abnormal and needs to be overhauled.
In one embodiment, the control method further includes:
calculating an attenuation value of the second wind speed according to the second wind speed and the rotating speed of the fan 600;
judging whether the attenuation value of the second wind speed is larger than the attenuation value threshold value or not;
if the attenuation value of the second wind speed is greater than the attenuation value threshold, determining that dust removal is required for the dust screen 1010, and generating third prompt information for prompting that dust removal is required for the dust screen 1010.
It will be appreciated that, by calculating the attenuation value of the second wind speed according to the operational relationship between the rotational speed of the fan 600 and the second wind speed, it can be determined whether the dust screen 1010 of the fan 600 is blocked by dust. For example, when the attenuation value of the second wind speed corresponding to the same rotation speed of the fan 600 is attenuated to 50% or more, the main control circuit 400 determines that dust removal is required for the dust screen 1010, and generates third prompt information for prompting that dust removal is required for the dust screen 1010, so as to prompt the user to clean the dust screen 1010 in time.
In one embodiment, the control method further includes:
judging whether the temperature of the electronic component is lower than the normal working temperature range, and generating a second wind speed regulation and control instruction when the temperature of the electronic component is higher than the normal working temperature range;
and sending the second wind speed regulation and control instruction to the second processing module 500, so that the second processing module 500 generates a driving signal for reducing the rotating speed of the fan 600 according to the second wind speed regulation and control instruction.
In one embodiment, the control method further includes:
judging whether the high-temperature duration time is longer than a preset time;
if the high-temperature duration time is longer than the preset time, generating high-temperature early warning information;
wherein the high temperature duration is a time during which the temperature of the electronic component is continuously higher than the normal operating temperature range.
In this embodiment, assuming that the preset time is 3 minutes, when the high-temperature duration is determined to be greater than 3 minutes, the main control circuit 400 generates high-temperature early warning information to remind a user to suspend use or close the magnetic resonance system, so that the temperature of the electronic component falls back into the normal working temperature range, and burning out due to overhigh temperature is avoided. It is understood that the preset time may be set empirically or by the master control circuit 400 by itself, and is not limited to 3 minutes in the present embodiment.
In summary, the invention provides a fan heat dissipation device and a control method thereof. The fan heat sink includes a cover 100, a temperature detecting part 200, a first process module 300, a main control circuit 400, a second process module 500, a fan 600, and a ventilation pipe 700. The cover 100 is used to enclose the electronics of the superconducting magnet side of the magnetic resonance system, and at least one ventilation hole 110 is provided on each of the opposite sides of the cover 100. The temperature detecting member 200 is provided in the cover 100 to detect the temperature of the electronic component. The first processing module 300 is disposed in the cover 100, and is configured to monitor and feed back the temperature of the electronic component detected by the temperature detecting component 200. The main control circuit 400 is in communication connection with the first processing module 300, receives the temperature of the electronic component fed back by the first processing module 300, determines whether the temperature of the electronic component is higher than a normal working temperature range, and generates a fan rotation speed regulation command when the temperature of the electronic component is higher than the normal working temperature range. The second processing module 500 is in communication connection with the main control circuit 400, and is configured to receive the fan rotation speed regulation command sent by the main control circuit 400, and generate a driving signal according to the fan rotation speed regulation command. The fan 600 is electrically connected to the second processing module 500, and is configured to adjust a fan rotation speed according to the driving signal. The first end of the ventilation pipe 700 is connected to the ventilation hole 110 on one surface of the cover 100, and the second end is connected to the air outlet of the fan 600. In the present invention, the temperature of the electronic component is detected by the temperature detecting component 200, and the main control circuit 400 determines whether the temperature of the electronic component is higher than a normal operating temperature range, and generates a fan rotation speed regulating command when the temperature of the electronic component is higher than the normal operating temperature range, so that the second processing module 500 generates a driving signal for driving the fan 600 to operate according to the fan rotation speed regulating command, adjusts the rotation speed of the fan 600, so as to increase the wind speed passing through the ventilation hole 110, accelerate the air circulation in the cover 100, and further achieve the effect of accelerating the cooling, so that the temperature of the electronic component is kept within the normal operating temperature range.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. A fan heat sink, comprising:
a cover for enclosing electronic components of the medical imaging system, the cover being provided with at least one vent on each of opposite sides;
a temperature detection member provided in the cover for detecting a temperature of the electronic component;
the first processing module is arranged in the cover cap and is used for monitoring and feeding back the temperature of the electronic component detected by the temperature detection component;
the main control circuit is in communication connection with the first processing module, receives the temperature of the electronic component fed back by the first processing module, judges whether the temperature of the electronic component is higher than a normal working temperature range, and generates a fan rotating speed regulating instruction when the temperature of the electronic component is higher than the normal working temperature range; calculating a fan rotating speed attenuation value according to the rotating speed of the fan and the duty ratio of the fan rotating speed regulation command, judging whether the fan rotating speed attenuation value is larger than an attenuation value threshold, judging that the fan breaks down when the fan rotating speed attenuation value is larger than the attenuation value threshold, and generating first prompt information for prompting that the fan breaks down; the fan rotating speed regulating instruction is a pulse width modulation signal;
the second processing module is in communication connection with the main control circuit and is used for receiving the fan rotating speed regulating and controlling instruction sent by the main control circuit and generating a driving signal according to the fan rotating speed regulating and controlling instruction; the system is also used for monitoring the rotating speed of the fan and feeding back the rotating speed of the fan to the main control circuit;
the fan is electrically connected with the second processing module and is used for adjusting the rotating speed of the fan according to the driving signal; and
the first end of the ventilation pipe is communicated with the ventilation hole on one surface of the cover, and the second end of the ventilation pipe is connected with the air outlet of the fan;
the base is matched with the cover, a cavity is formed at the bottom of the cover and the base, an air inlet is formed in one side face of the base, and the base is connected with the first end of the ventilation pipe through the air inlet.
2. The fan heat sink of claim 1, wherein the number of vent holes on the face of the cover that communicates with the vent pipe is greater than the number of vent holes on the other face of the cover that is provided with vent holes, or the number of vent holes on the face of the cover that communicates with the vent pipe is equal to the number of vent holes on the other face of the cover that is provided with vent holes, but the cross-sectional area of the vent holes of the former is greater than the cross-sectional area of the vent holes of the latter.
3. The fan heat sink of claim 1 wherein the bottom and top of the cover are each provided with a plurality of vent holes.
4. The fan heat sink of claim 1 further comprising at least one single plate perpendicular to the bottom and top of the cover; the cover areas of the single plate at the top and bottom of the cover cap do not overlap the cover areas of the vent holes.
5. The fan heat sink of claim 1, further comprising:
the first wind speed sensor is arranged at the air inlet of the base and is used for detecting the first wind speed of the air inlet of the base; and
the second wind speed sensor is arranged at the air outlet of the fan and used for detecting the second wind speed of the air outlet of the fan.
6. The fan heat sink of claim 5, further comprising:
the dustproof net is arranged at the air inlet of the fan and used for preventing external dust from entering the fan;
the first processing module is also used for monitoring a first wind speed measured by the first wind speed sensor and feeding back the first wind speed to the main control circuit;
the second processing module is also used for monitoring a second wind speed measured by the second wind speed sensor and feeding the second wind speed back to the main control circuit;
the main control circuit is further configured to calculate an attenuation value of the first wind speed according to the first wind speed and the second wind speed, determine whether the attenuation value of the first wind speed is greater than the attenuation value threshold, determine that the ventilation pipe fails when the attenuation value of the first wind speed is greater than the attenuation value threshold, generate second prompting information for prompting that the ventilation pipe fails, calculate an attenuation value of the second wind speed according to the second wind speed and the rotation speed of the fan, determine whether the attenuation value of the second wind speed is greater than the attenuation value threshold, determine that dust removal is required when the attenuation value of the second wind speed is greater than the attenuation value threshold, and generate third prompting information for prompting that dust removal is required for the dust removal of the dust prevention net.
7. A control method of a fan heat sink according to any one of claims 1 to 6, comprising:
receiving a temperature of an electronic component of the in-hood medical imaging system monitored and fed back by the first processing module;
judging whether the temperature of the electronic component is higher than a normal working temperature range;
if the temperature of the electronic component is higher than the normal working temperature range, generating a fan rotating speed regulating instruction, and sending the fan rotating speed regulating instruction to a second processing module, so that the second processing module generates a driving signal for regulating the rotating speed of the fan according to the fan rotating speed regulating instruction; the fan rotating speed regulating instruction is a pulse width modulation signal;
receiving the rotating speed of the fan monitored and fed back by the second processing module;
calculating a fan rotating speed attenuation value according to the rotating speed of the fan and the duty ratio of the fan rotating speed regulating instruction;
judging whether the fan rotating speed attenuation value is larger than an attenuation value threshold value or not;
and when the fan rotating speed attenuation value is larger than the attenuation value threshold value, generating first prompting information for prompting that the fan fails.
8. The control method as set forth in claim 7, further comprising:
receiving a first wind speed of a base air inlet monitored and fed back by the first processing module and a second wind speed of the fan air outlet monitored and fed back by the second processing module;
calculating an attenuation value of the first wind speed according to the first wind speed and the second wind speed;
judging whether the attenuation value of the first wind speed is larger than the attenuation value threshold value or not;
if the attenuation value of the first wind speed is larger than the attenuation value threshold value, judging that the ventilation pipe breaks down, and generating second prompting information for prompting that the ventilation pipe breaks down.
9. The control method as set forth in claim 8, further comprising:
calculating an attenuation value of the second wind speed according to the second wind speed and the rotating speed of the fan;
judging whether the attenuation value of the second wind speed is larger than the attenuation value threshold value or not;
if the attenuation value of the second wind speed is larger than the attenuation value threshold value, judging that dust removal is needed to be carried out on the dust screen, and generating third prompt information for prompting that the dust removal is needed to be carried out on the dust screen; the dustproof net is arranged at the air inlet of the fan and used for preventing external dust from entering the fan.
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| US7338208B2 (en) * | 2004-11-24 | 2008-03-04 | General Electric Company | Methods and apparatus for CT system thermal control architecture |
| CN101368938B (en) * | 2007-08-17 | 2012-08-29 | 华为技术有限公司 | Device and method for detecting obstruction degree of dustproof mesh, and electronic equipment thereof |
| US8481949B2 (en) * | 2011-11-14 | 2013-07-09 | Siemens Medical Solutions Usa, Inc. | Apparatus and methods for cooling positron emission tomography scanner detector crystals |
| JP2014090963A (en) * | 2012-11-06 | 2014-05-19 | Toshiba Corp | Medical image processor, and x-ray ct apparatus |
| CN103860187B (en) * | 2012-12-10 | 2015-05-13 | 上海联影医疗科技有限公司 | Cooling system of positron emission tomography scanner |
| CN103644630A (en) * | 2013-11-28 | 2014-03-19 | 中山市蓝水能源科技发展有限公司 | Central air-conditioning pipeline detection system |
| CN104825184A (en) * | 2015-04-28 | 2015-08-12 | 杭州灿维影像科技有限公司 | Air coolers, cooling system comprising air coolers and temperature regulating and balancing method for CT (Computed Tomography) scanning machine |
| CN106523412B (en) * | 2015-09-11 | 2018-07-03 | 上海电科电器科技有限公司 | The fan monitoring method and monitoring device of frame circuit breaker |
| CN105704982B (en) * | 2015-12-18 | 2017-12-22 | 上海联影医疗科技有限公司 | A kind of cooling system for medical imaging apparatus |
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