CN112345794B - Fan airflow direction detection device and method - Google Patents
Fan airflow direction detection device and method Download PDFInfo
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- CN112345794B CN112345794B CN202011131242.6A CN202011131242A CN112345794B CN 112345794 B CN112345794 B CN 112345794B CN 202011131242 A CN202011131242 A CN 202011131242A CN 112345794 B CN112345794 B CN 112345794B
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- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 51
- 238000005070 sampling Methods 0.000 claims description 27
- 238000007664 blowing Methods 0.000 claims description 23
- 230000005669 field effect Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
- G01P13/006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using thermal variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
- G01P13/025—Indicating direction only, e.g. by weather vane indicating air data, i.e. flight variables of an aircraft, e.g. angle of attack, side slip, shear, yaw
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Abstract
The invention provides a fan airflow direction detection device, comprising: a fixing plate; the heating unit is detachably arranged on the fixing plate and can generate heat; wherein the fan is capable of generating an induced or blown air flow in the vicinity of the heat generating unit; the invention provides a fan airflow direction detection device, which can detect the temperature change caused by the airflow of a fan to be detected by using a temperature detection unit so as to judge the airflow direction, and has the advantages of simple structure and convenience in detection. The invention also provides a fan airflow direction detection method, which utilizes the temperature detection unit to detect and compare the temperature rise values before and after the heating resistor is opened when the fan generates induced draft airflow, obtains the airflow direction of the fan and improves the detection precision.
Description
Technical Field
The invention relates to the technical field of detection in electronic hardware design, in particular to a fan airflow direction detection device and method.
Background
Electronic equipment such as switches and servers need to be equipped with fans for cooling the equipment. The air suction or blowing of the fan needs to be arranged according to the needs of a heat dissipation design engineer. However, the direction of the airflow of the fan is difficult to be visually determined by the fan blades rotating at high speed. If a fan for sucking air is mistakenly placed in a system needing blowing air, strong vortex backflow air can be caused, so that the heat dissipation performance in the system is sharply reduced, and serious accidents are inevitably caused. As for some equipment, in order to adapt to different arrangement requirements, two air flow assembly modes of fan suction and fan blowing are designed at the beginning of design. In order to share the fan module and reduce the cost, the fan module shell, the terminals, the circuit board and the like are multiplexed, and only the installation directions of the fans are opposite. In this case, the fan mixing and the like occur with high probability.
The existing airflow direction detection device is generally as follows:
1. a high precision pressure sensor. The direction is judged by monitoring the pressure at the two ends of the airflow, and the precision of the pressure sensor is high. Due to the limitations of cost and detection pressure, it cannot be applied on a large scale.
2. Mechanical detection, such as a device for observing wind directions through meteorology, has the problems of large volume, insufficient precision and the like, and is very easily influenced by the placement direction of a system, such as detection failure caused by equipment inclination and the like.
Therefore, in order to cope with this problem, it is necessary to design a simple detection device for detecting the direction of the fan airflow with high accuracy.
Disclosure of Invention
The invention provides a fan airflow direction detection device, which is simple in structure and convenient to detect by utilizing a temperature detection unit to detect temperature change caused by fan airflow to be detected so as to judge the airflow direction.
The invention also aims to provide a fan airflow direction detection method, which utilizes a temperature detection unit to detect and compare temperature rise values before and after the heating resistor is opened when the fan generates induced draft airflow, obtains the airflow direction of the fan and improves the detection precision.
The technical scheme provided by the invention is as follows:
a fan airflow direction detection device, comprising:
a fixing plate;
the heating unit is detachably arranged on the fixing plate and can generate heat;
wherein the fan is capable of generating an induced or blown air flow in the vicinity of the heat generating unit; and
and the temperature detection unit can detect the temperature change caused by the airflow so as to judge the airflow direction of the fan.
Preferably, the heat generating unit includes:
a heating resistor;
and a power supply circuit electrically connected to the heating resistor and capable of generating heat by the heating resistor.
Preferably, the method further comprises:
a field effect transistor provided within the power supply circuit;
and a controller connected to the field effect transistor and capable of controlling the field effect transistor to change the power supply circuit into a path so that the heat generating resistor generates heat.
Preferably, the fixing plate is a printed circuit board.
Preferably, the controller is one of a baseboard management controller, a complex programmable logic device and a central processing unit.
Preferably, the temperature detection unit includes at least one temperature sensor.
Preferably, the fan has rotating blades.
A fan airflow direction detection method comprises the following steps:
when the temperature detection unit comprises a temperature sensor, starting and setting the rotating speed of the fan;
respectively detecting an air suction airflow critical value and an air blowing airflow critical value by using a temperature sensor;
the critical value of the air suction airflow is a temperature rise value before and after the heating resistor is turned on when the fan generates the air suction airflow; the critical value of the blowing air flow is a temperature rise value before and after the heating resistor is started when the fan generates the blowing air flow;
detecting temperature rise values generated before and after the heating resistor is started by using a temperature sensor, and comparing the temperature rise values with the air suction airflow critical value and the air blowing airflow critical value respectively;
if the absolute difference value between the fan temperature rise value in the air flow direction to be detected and the air suction air flow critical value is smaller than a set value, generating air suction air flow by the air flow of the fan in the air flow direction to be detected;
if the absolute difference value between the fan temperature rise value of the airflow direction to be detected and the blowing airflow critical value is smaller than a set value, the airflow of the fan in the airflow direction to be detected generates blowing airflow;
when the temperature detection unit comprises two or more temperature sensors, the fan is connected to a detection device;
respectively recording temperature rise values generated by each temperature sensor before and after the heating resistor is turned on, and sequentially arranging the temperature rise values detected by the temperature sensors from small to large;
the fan airflow direction for detecting the airflow direction is consistent with the arrangement direction of the temperature rise values of the sensors.
Preferably, the process of detecting the temperature rise value generated by the fan before and after the heating resistor is turned on includes:
starting and setting the rotating speed of the fan;
after the fan runs stably, each temperature sensor samples temperature values at intervals of a certain time to obtain a plurality of front temperature sampling values, and calculates the average value of the front temperature sampling average values to obtain a front sampling average value;
starting a heating resistor, sampling temperature values at intervals of a certain time by each temperature sensor after the heating resistor stabilizes the temperature to obtain a plurality of rear temperature sampling values, and calculating the average value of the rear temperature sampling average values to obtain a rear sampling average value;
and the temperature rise value of the fan before and after the heating resistor is turned on is the absolute difference value of the rear sampling mean value and the front sampling mean value.
Preferably, the rotation speed of the fan is 60-80%.
Advantageous effects
The invention provides a fan airflow direction detection device, which is simple in structure and convenient to detect by utilizing a temperature detection unit to detect temperature change caused by fan airflow to be detected so as to judge the airflow direction.
The invention also aims to provide a fan airflow direction detection method, which utilizes a temperature detection unit to detect and compare temperature rise values before and after the heating resistor is opened when the fan generates induced draft airflow, obtains the airflow direction of the fan and improves the detection precision.
Drawings
Fig. 1 is a schematic structural diagram of a fan airflow direction detection device according to the present invention.
Fig. 2 is a schematic structural diagram of the heating unit according to the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of the fan airflow direction detecting device according to the present invention.
Fig. 4 is a flow chart of a method for detecting the direction of fan airflow according to the present invention.
FIG. 5 is a flow chart of a method for detecting two or more temperature sensors of the temperature detection unit according to the present invention.
Fig. 6 is a flow chart of detecting a temperature rise value generated before and after the heating resistor is turned on according to the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms "in", "upper", "lower", "lateral", "inner", etc. indicate directions or positional relationships based on those shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, based on the technical problem of the background art, the present invention provides a fan airflow direction detecting device, including: a fixing plate 110, a heat generating unit 120, and a temperature detecting unit 130.
Wherein, the heating unit 120 is detachably disposed on the fixing plate 110 and can generate heat; wherein the fan can generate air suction or air blowing airflow near the heating unit; and the temperature detection unit 130 can detect a temperature change caused by the air flow to determine the air flow direction of the fan.
As shown in fig. 2, the heat generating unit 120 includes: the heating resistor 121 and the power supply circuit 122, and the power supply circuit 122 is electrically connected to the heating resistor 121, so that the heating resistor 121 can generate heat. The main function of the heating resistor 121 is to generate a certain amount of heat after the circuit path, and the amount of heat follows W = U2/R.
In another embodiment, further comprising: a field effect transistor 123 and a controller 124 are also provided within the power supply circuit 122. The controller 124 is connected to the field effect transistor 123, and can control the field effect transistor 123 to turn on the power supply circuit 122, so that the heating resistor 121 generates heat. Preferably, the Field-Effect Transistor is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), which is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) for short, and is a Field-Effect Transistor (Field-Effect Transistor) that can be widely used in analog circuits and digital circuits. The main function is to change the circuit into a path after receiving a certain voltage instruction.
In another embodiment, the fixing plate 110 is a printed circuit board, the heating unit 120 can print the power supply circuit 122 on the fixing plate 110, and the fixing plate 110 is a PCB board and is a carrier of the circuit device; temperature detect unit 130 demountable installation is on the PCB board, and when avoiding resistance to generate heat, the heat directly conducts to temperature sensor through the PCB board, hollows out the PCB board in the H shape.
Thus, the power supply and the heating resistor become a path by the controller sending a high voltage signal to the MOSFET. The controller 124 reads the temperature values of the temperature sensors and detects the temperature rise values of the two sensors over a period of time. Because of the air flow process, the temperature will increase after the air flow blows through the heating resistor 121. Therefore, the direction of the airflow can be judged according to the temperature rise value of the temperature sensor. The temperature rise value is selected to carry out the remaining judgment, and the individual difference of the temperature sensor is eliminated so as to avoid the misjudgment.
As a preferred option, for the switch or the server, a fan speed control system is generally provided, the main function is to calculate certain parameters or issue specific instructions, and the controller 124 is one of a baseboard management controller, a complex programmable logic device and a central processing unit.
As shown in fig. 3, in another embodiment, the temperature detection unit 130 includes at least one temperature sensor. The number of the temperature sensors is at least 1, and the judgment precision is higher when the number is larger. When only 1 temperature sensor is needed, the judgment of the airflow direction can be made only by comparing the temperature rise value of the temperature sensor with the critical value in the judgment process. The threshold value is a sensor variation value corresponding to a forward or reverse airflow condition that is tested in advance. The more the number of the temperature sensors is, the more accurate the judgment of the angle of the airflow direction is, and as a preference, the airflow detection in the embodiment can also be applied to other electronic heat dissipation equipment, such as a fan or a blower with rotating fan blades.
The invention also provides a method for detecting the airflow direction of the fan, which comprises the following steps:
as shown in fig. 4, when the temperature detecting unit 130 includes a temperature sensor;
step S110, starting and setting the rotating speed of the fan;
step S120, respectively detecting critical values T of induced draft air flow by using temperature sensors x And blowing air flow critical value T c ；
Wherein, the critical value T of the induced draft air flow x The temperature rise value before and after the heating resistor is turned on when the fan generates air suction airflow;
critical value T of blowing air flow c The temperature rise value before and after the heating resistor is turned on when the fan generates blowing air flow;
step S130, detecting a temperature rise value T caused by fan airflow before and after the heating resistor 121 is turned on by using a temperature sensor Q And respectively comparing the values with the critical value T of the induced draft airflow x And the blowing air flow critical value T c Make a comparison；
If the temperature rise value is equal to the critical value T of the induced draft airflow x If the absolute difference value of the air flow direction to be detected is smaller than the set value delta, judging that the air flow of the fan in the air flow direction to be detected generates air suction flow;
if the fan temperature rise value of the airflow direction to be detected and the blowing airflow critical value T c If the absolute difference value of the air flow is less than the set value delta, judging that the air flow of the fan to be detected in the flow direction generates blowing air flow;
as shown in fig. 5, when the temperature detecting unit 130 includes two or more temperature sensors, the temperature sensors are distributed around the heating resistor 121 in a circumferential array; and marks the number of each sensor P 1 ，P 2 …P i …P n }，P i Numbering corresponding sensors and corresponding positions;
step S210, connecting a fan into a detection device;
step S220, respectively recording temperature rise values generated by each temperature sensor before and after the heating resistor is turned on;
step S230, arranging the temperature rise values detected by the temperature sensors in sequence from small to large; the direction of the fan airflow for detecting the direction of the airflow is consistent with the arrangement direction of the temperature rise values of the sensors.
As shown in fig. 6, the process of detecting the temperature rise value generated by the fan before and after the heating resistor is turned on includes:
step S310, starting and setting the rotating speed of the fan;
step S320, after the fan runs stably, each temperature sensor samples temperature values at intervals of a certain time to obtain a plurality of front temperature sampling values, and calculates the average value of the front temperature sampling average values to obtain a front sampling average value;
step S330, starting a heating resistor, sampling temperature values of each temperature sensor at intervals of a certain time after the heating resistor stabilizes the temperature to obtain a plurality of rear temperature sampling values, and calculating an average value of the rear temperature sampling average values to obtain a rear sampling average value;
step S340, the temperature rise value generated by the fan before and after the heating resistor is turned on is an absolute difference value between the rear sampling mean value and the front sampling mean value.
In another embodiment, the rotation speed of the fan in step S210 and step S110 is set to 60% -80%.
For further explanation, the temperature detecting unit 130 includes two temperature sensors, which are respectively labeled as a first temperature sensor 131 and a second temperature sensor 132.
Step one, a fan is newly inserted into the exchanger, and a controller, such as a baseboard management controller, detects an in-place signal of the fan and starts a fan airflow direction detection program. The rotating speed of the fan is set to be 80%, the rotating speed of the fan is fixed, judgment accuracy can be improved, and the situation that the rotating speed of the fan is too high or too low to influence judgment reliability is avoided. The value of 80% can be changed into any reliable fixed value, and the detection precision test is generally carried out in advance and then confirmed.
Step two, after time t =15 seconds elapses, the temperature values of the first temperature sensor 131 and the second temperature sensor 132 are read, and the temperature values are read every 3 seconds for 5 times in succession. The controller records the average of the temperatures of the first temperature sensor 131 and the second temperature sensor 132 as T 31 、T 32 。
Firstly, the value of 15 seconds is taken because 10 to 15 seconds are needed to stabilize the rotating speed after the rotating speed is set by the fan; secondly, recording the temperature values for 5 times continuously, and taking an average value to avoid reading errors caused by accidental factors of the reading.
And step three, the controller sends a high-voltage signal to the MOSFET so that the power supply forms a channel, the heating resistor R starts to heat, and the resistor reaches a stable temperature under certain air flow blowing according to different resistance characteristics, wherein the required time is different. Typically 10 seconds.
Step four, after the thermal resistance temperature is stable (after 10 seconds), the controller continuously reads the temperature values of the first temperature sensor 131 and the second temperature sensor 132, the temperature values are read once every 3 seconds and continuously read for 5 times, the average value is calculated and recorded as T' 31 And T' 32 。
Step fiveAnd the controller calculates delta T = (T' 31 -T 31 )-(T′ 32 -T 32 ). When Δ T is less than 0, it is determined that the air flow direction is from the first temperature sensor 131 to the second temperature sensor 132; when Δ T > 0, it is determined that the airflow direction is blown from the second temperature sensor 132 to the first temperature sensor 131.
And step six, repeatedly executing the step two to the step five for 3 times, namely continuously judging for 3 times, and if the airflow direction results are judged to be consistent for three times, finishing the detection process. And if the results are inconsistent, the steps are carried out again.
The specific parameters of the working process, such as the time interval, the judgment times, etc., are all necessary parameters, but are not limited to be set as the above case, and can be set reasonably according to the judgment precision requirement. The mosfet device and the controller do not show specific arrangement positions, and position definition can be carried out according to the overall design of the PCB, so that the authority of the invention is not influenced.
The above example only shows the process of detecting air flow in the left and right directions, and if the temperature sensors are added and arranged circumferentially around the heating resistor, the detection of air flow directions in multiple directions can be realized, and the invention belongs to the application scope of the invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (9)
1. A fan airflow direction detecting device, comprising:
a fixing plate;
the heating unit is detachably arranged on the fixing plate and can generate heat;
wherein the fan is capable of generating an induced or blown air flow in the vicinity of the heat generating unit; and
a temperature detection unit capable of detecting a temperature change caused by the airflow to determine an airflow direction of the fan;
when the temperature detection unit comprises a temperature sensor, starting and setting the rotating speed of the fan;
respectively detecting an air suction airflow critical value and an air blowing airflow critical value by using a temperature sensor;
wherein, the critical value of the air suction airflow is a temperature rise value before and after the heating resistor is opened when the fan generates the air suction airflow; the critical value of the blowing air flow is a temperature rise value before and after the heating resistor is started when the fan generates the blowing air flow;
detecting temperature rise values generated before and after the heating resistor is started by using a temperature sensor, and comparing the temperature rise values with the air suction airflow critical value and the air blowing airflow critical value respectively;
if the absolute difference value between the fan temperature rise value of the airflow direction to be detected and the critical value of the air suction airflow is smaller than a set value, the airflow of the fan in the airflow direction to be detected generates air suction airflow;
if the absolute difference value between the fan temperature rise value of the airflow direction to be detected and the blowing airflow critical value is smaller than a set value, the airflow of the fan in the airflow direction to be detected generates blowing airflow;
when the temperature detection unit comprises two or more temperature sensors, the fan is connected to a detection device;
respectively recording temperature rise values generated by each temperature sensor before and after the heating resistor is turned on, and sequentially arranging the temperature rise values detected by the temperature sensors from small to large;
the fan airflow direction for detecting the airflow direction is consistent with the arrangement direction of the temperature rise value of the sensor.
2. The fan airflow direction detecting device according to claim 1, wherein the heat generating unit includes:
a heating resistor;
and a power supply circuit electrically connected to the heating resistor and capable of generating heat by the heating resistor.
3. The fan airflow direction detecting device according to claim 2, further comprising:
a field effect transistor provided within the power supply circuit;
and a controller connected to the field effect transistor and capable of controlling the field effect transistor to change the power supply circuit into a path so that the heat generating resistor generates heat.
4. The fan airflow direction detecting device according to any of claims 1-3, wherein the fixing plate is a printed circuit board.
5. The apparatus as claimed in claim 3, wherein the controller is one of a baseboard management controller, a complex programmable logic device and a central processing unit.
6. The fan airflow direction detecting device according to claim 1 or 5, wherein the temperature detecting unit includes at least one temperature sensor.
7. The fan airflow direction detecting device according to claim 6, wherein the fan has rotating blades.
8. A fan airflow direction detection method using the fan airflow direction detection device according to any one of claims 1 to 7, wherein a detection process of a temperature rise value generated by the fan before and after the heating resistor is turned on includes:
starting and setting the rotating speed of the fan;
after the fan runs stably, each temperature sensor samples temperature values at intervals of a certain time to obtain a plurality of front temperature sampling values, and calculates the average value of the front temperature sampling average values to obtain a front sampling average value;
starting a heating resistor, sampling temperature values of each temperature sensor at intervals of a certain time after the heating resistor stabilizes the temperature to obtain a plurality of rear temperature sampling values, and calculating the average value of the rear temperature sampling average values to obtain a rear sampling average value;
and the temperature rise value generated by the fan before and after the heating resistor is turned on is the absolute difference value of the rear sampling mean value and the front sampling mean value.
9. The method as claimed in claim 8, wherein the fan has a rotation speed of 60-80%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008855A (en) * | 2006-01-25 | 2007-08-01 | 英业达股份有限公司 | System and method for controlling rotational speed of fan |
| CN104214119A (en) * | 2014-08-14 | 2014-12-17 | 浪潮电子信息产业股份有限公司 | Fan steering switching technology of network equipment |
| CN105807089A (en) * | 2016-05-13 | 2016-07-27 | 深圳市毅丰光电科技有限公司 | Projector air speed detection device and projector |
| CN209878804U (en) * | 2019-04-24 | 2019-12-31 | 中山雅特生科技有限公司 | System for detecting wind direction of cooling fan of power supply product |
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2020
- 2020-10-21 CN CN202011131242.6A patent/CN112345794B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008855A (en) * | 2006-01-25 | 2007-08-01 | 英业达股份有限公司 | System and method for controlling rotational speed of fan |
| CN104214119A (en) * | 2014-08-14 | 2014-12-17 | 浪潮电子信息产业股份有限公司 | Fan steering switching technology of network equipment |
| CN105807089A (en) * | 2016-05-13 | 2016-07-27 | 深圳市毅丰光电科技有限公司 | Projector air speed detection device and projector |
| CN209878804U (en) * | 2019-04-24 | 2019-12-31 | 中山雅特生科技有限公司 | System for detecting wind direction of cooling fan of power supply product |
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