CN110954967A - Device and method for detecting foreign matters in fan - Google Patents
Device and method for detecting foreign matters in fan Download PDFInfo
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- CN110954967A CN110954967A CN201911264607.XA CN201911264607A CN110954967A CN 110954967 A CN110954967 A CN 110954967A CN 201911264607 A CN201911264607 A CN 201911264607A CN 110954967 A CN110954967 A CN 110954967A
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Abstract
The utility model provides a detection apparatus of foreign matter in fan which characterized in that: the schlieren imaging device comprises a schlieren imaging component, a controller and an upper computer, wherein the schlieren imaging component is arranged outside a casing of the fan and comprises a light source arranged at an air inlet close to the front side of the casing and an image acquisition device arranged at an air outlet close to the rear side of the casing; still be equipped with temperature-detecting device, impeller rotational speed detection device and impeller position detection device in the casing of fan, light source, image acquisition device, temperature-detecting device, impeller rotational speed detection device and impeller position detection device all are connected with the controller electricity, controller and host computer communication connection. The detection device for the foreign matters in the fan can automatically detect and visually display the entering condition of the foreign matters.
Description
Technical Field
The invention relates to the technical field of fans, in particular to a device and a method for detecting foreign matters in a fan.
Background
The fan generally includes a casing, an impeller disposed in the casing, and a motor for driving the impeller to rotate, wherein the casing is provided with an air inlet and an air outlet at front and rear sides thereof, respectively. Due to the existence of the air inlet and the air outlet, the fan can easily suck foreign matters when in use, and is particularly more prominent when used as a suction fan. Once the foreign matter enters the fan, if the fan is not found and the fan is continuously operated, the fan can be damaged to different degrees, such as blade deformation, bearing damage, motor burn and the like. However, a device capable of automatically detecting and visually displaying the entering condition of the foreign matter is not designed at present, so that the problem which needs to be solved at present is urgent.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the detection device for the foreign matters in the fan is capable of automatically detecting and visually displaying the entering condition of the foreign matters.
The technical solution of the invention is as follows: the utility model provides a detection apparatus of foreign matter in fan which characterized in that: the schlieren imaging device comprises a schlieren imaging component, a controller and an upper computer, wherein the schlieren imaging component is arranged outside a shell of a fan and comprises a light source arranged at an air inlet close to the front side of the shell and an image acquisition device arranged at an air outlet close to the rear side of the shell, a focusing lens, a slit and a collimating lens are further sequentially arranged between the light source and the front side of the shell, a schlieren lens and a knife edge are further sequentially arranged between the rear side of the shell and the image acquisition device, the light source, the focusing lens, the slit, the collimating lens, the schlieren lens, the knife edge and the image acquisition device are positioned on the same optical axis, the slit is positioned on a focal plane of the collimating lens, the knife edge is positioned on a focal plane of the schlieren lens, the light source is converged on the slit through the focusing lens, light beams with the sizes limited by the slit are converted into parallel light beams through the collimating lens, imaging in an image acquisition device after passing through a schlieren lens and a knife edge; still be equipped with temperature-detecting device, impeller rotational speed detection device and impeller position detection device in the casing of fan, light source, image acquisition device, temperature-detecting device, impeller rotational speed detection device and impeller position detection device all are connected with the controller electricity, controller and host computer communication connection.
The working principle of the invention is as follows:
the device for detecting the foreign matters in the fan acquires the actual airflow image in the fan in real time through the schlieren imaging component and simultaneously acquires the running state parameters of the fan, including the temperature, the rotating speed of the impeller and the position of the impeller, so as to acquire the initial airflow image which is pre-stored in an upper computer under the same running state parameters and has no foreign matter disturbance, the upper computer compares the actual airflow image with the initial airflow image to judge whether the foreign matters enter the fan, and when the foreign matters enter the fan, the foreign matters can cause certain interference on the airflow in the fan, so that the actual airflow image is different from the initial airflow image.
After adopting the structure, the invention has the following advantages:
according to the principle that foreign matters can affect the airflow in the fan when entering the fan, the airflow change in the fan is automatically detected through the schlieren imaging assembly, and the automation level is high; secondly, the schlieren imaging component can visually display the airflow change in an image form, and the intuition is strong; thirdly, the schlieren imaging assembly is not in direct contact with the fan, so that the influence on the air flow in the fan is small, and the accuracy of a detection result can be ensured; and finally, acquiring the operating state parameters of the temperature of the fan, the rotating speed of the impeller and the position of the impeller to obtain an initial airflow image under the same operating state parameters and without foreign matter disturbance, thereby obtaining the initial airflow image with better accuracy and relevance, and conveniently, quickly and accurately judging whether foreign matters enter the fan by comparing the initial airflow image with the initial airflow image.
Preferably, the casing is made of transparent material. This be provided with and do benefit to schlieren formation of image subassembly formation of image to can obtain more accurate testing result.
Preferably, the portable electronic device further comprises a first base, a second base, and a first XYZ position adjustment device and a second XYZ position adjustment device for driving the first base and the second base respectively, wherein the light source, the focusing lens, the slit, and the collimating lens are all mounted on the first base, the knife edge and the image acquisition device are all mounted on the second base, the first base and the second base are respectively provided with a first position detection device and a second position detection device, and the first XYZ position adjustment device, the second XYZ position adjustment device, the first position detection device, and the second position detection device are all electrically connected to the controller. By the arrangement, even when the optical element with smaller size cannot observe the whole observation surface in the fan at the same time, the position of the optical element can still be moved to observe in a time-sharing manner, and as long as the moving speed and the maximum observation visual angle are reasonable, a more accurate detection effect can still be obtained, so that the requirement on the performance of the optical element is reduced; in addition, the detection of the first position detection device and the second position detection device is also used for acquiring initial airflow images with better accuracy and correlation.
Preferably, decibel meters are arranged on the upper side, the lower side, the left side and the right side of the shell of the fan, and the decibel meters are electrically connected with the controller. The arrangement is characterized in that a decibel meter is additionally arranged to assist in judging whether foreign matters enter and the positions where the foreign matters enter, so that the optical element can be adjusted to a proper position to observe the foreign matters by adjusting the positions of the first XYZ position adjusting device and the second XYZ position adjusting device.
The invention also aims to solve the technical problems that: the method for detecting the foreign matters in the fan can quickly, accurately and automatically detect and visually display the entering condition of the foreign matters.
The other technical solution of the invention is as follows: a method for detecting foreign matters in a fan is characterized by comprising the following steps: it comprises the following steps:
(1) the upper computer controls the schlieren imaging component outside the fan shell to start working through the controller, a light source of the schlieren imaging component is converged on the slit through the focusing lens, a light beam with the size limited by the slit is converted into a parallel light beam through the collimating lens, the parallel light beam transmits through an airflow field of the fan and forms an image in the image acquisition device after passing through the schlieren lens and the knife edge;
(2) the method comprises the steps that an image acquisition device acquires and uploads an actual airflow image in the fan in real time, and meanwhile, a temperature detection device, an impeller rotating speed detection device and an impeller position detection device which are arranged in a shell of the fan are used for acquiring state operation parameters such as the temperature in the fan, the rotating speed of an impeller and the position of the impeller in real time, and accordingly, an initial airflow image which is stored in an upper computer in advance under the same operation state parameters and has no foreign object disturbance is acquired;
(3) and comparing the actual airflow image with the initial airflow image by the upper computer to judge whether foreign matters enter the fan, if so, controlling the fan to stop running by the upper computer through the controller, and if not, ignoring.
After the method is adopted, the invention has the following advantages:
according to the principle that foreign matters can affect the airflow in the fan when entering the fan, the airflow change in the fan is automatically detected through the schlieren imaging assembly, and the automation level is high; secondly, the schlieren imaging component can visually display the airflow change in an image form, and the intuition is strong; thirdly, the schlieren imaging assembly is not in direct contact with the fan, so that the influence on the air flow in the fan is small, and the accuracy of a detection result can be ensured; and finally, acquiring the operating state parameters of the temperature of the fan, the rotating speed of the impeller and the position of the impeller to obtain an initial airflow image under the same operating state parameters and without foreign matter disturbance, thereby obtaining the initial airflow image with better accuracy and relevance, and conveniently, quickly and accurately judging whether foreign matters enter the fan by comparing the initial airflow image with the initial airflow image.
Preferably, in the step (1), before the upper computer controls the schlieren imaging module outside the casing of the fan through the controller to start operating, the decibel meters arranged at the upper, lower, left and right positions of the casing of the fan collect sound loudness and upload the sound loudness through the controller, the upper computer assists to judge whether foreign matter enters and the entering position of the foreign matter according to the collected sound loudness information in the upper, lower, left and right directions, and controls the first XYZ position adjustment device and the second XYZ position adjustment device to move through the controller to adjust the observation position of the schlieren imaging module, and the state operation parameters in the step (2) further include the position of the first mount detected by the first position detection device and the position of the second mount detected by the second position detection device. By the arrangement, even when the optical element with smaller size cannot observe the whole observation surface in the fan at the same time, the position of the optical element can still be moved to observe in a time-sharing manner, and as long as the moving speed and the maximum observation visual angle are reasonable, a more accurate detection effect can still be obtained, so that the requirement on the performance of the optical element is reduced; in addition, the detection of the first position detection device and the second position detection device is also used for acquiring initial airflow images with better accuracy and correlation; in addition, whether foreign matters enter or not and the entering positions of the foreign matters are judged in an auxiliary mode by additionally arranging a decibel meter, so that the optical element can be adjusted to a proper position to observe the foreign matters by adjusting the positions of the first XYZ position adjusting device and the second XYZ position adjusting device.
Description of the drawings:
FIG. 1 is a schematic view of the optical path of the device for detecting foreign objects in a fan according to the present invention;
FIG. 2 is a functional schematic diagram of a device for detecting foreign matter in a fan according to the present invention;
FIG. 3 is a schematic diagram showing the distribution of decibel meters on the housing of the device for detecting foreign matter in a blower according to the present invention;
in the figure: 1-a fan, 2-a casing, 3-an impeller, 4-an air inlet, 5-an air outlet, 6-a motor, 7-a controller, 8-an upper computer, 9-a light source, 10-an image acquisition device, 11-a focusing lens, 12-a slit, 13-a collimating lens, 14-a schlieren lens, 15-a knife edge, 16-an optical axis, 17-a temperature detection device, 18-an impeller rotating speed detection device, 19-an impeller position detection device, 20-a first seat body, 21-a second seat body, 22-a first XYZ position adjustment device, 23-a second XYZ position adjustment device, 24-a first position detection device, 25-a second position detection device and 26-a decibel meter.
Detailed Description
The invention is further described with reference to the following embodiments in conjunction with the accompanying drawings.
Example 1:
a fan 1 generally comprises a casing 2, an impeller 3 arranged in the casing 2 and a motor 6 used for driving the impeller 3 to rotate, wherein an air inlet 4 and an air outlet 5 are respectively arranged on the front side and the rear side of the casing 2, the detection device for the foreign matters in the fan 1 comprises a schlieren imaging component, a controller 7 and an upper computer 8 which are arranged outside the casing 2 of the fan 1, the schlieren imaging component comprises a light source 9 arranged at the position close to the air inlet 4 on the front side of the casing 2 and an image acquisition device 10 arranged at the position close to the air outlet 5 on the rear side of the casing 2, a focusing lens 11, a slit 12 and a collimating lens 13 are sequentially arranged between the light source 9 and the front side of the casing 2, a schlieren lens 14 and a knife edge 15 are sequentially arranged between the rear side of the casing 2 and the image acquisition device 10, and the light source 9, the focusing lens 11, the knife edge 15, The slit 12, the collimating lens 13, the schlieren lens 14, the knife edge 15 and the image acquisition device 10 are positioned on the same optical axis 16, the slit 12 is positioned on the focal plane of the collimating lens 13, the knife edge 15 is positioned on the focal plane of the schlieren lens 14, the light source 9 is converged on the slit 12 through the focusing lens 11, the light beam with the size limited by the slit 12 is converted into a parallel light beam through the collimating lens 13, the parallel light beam transmits through the airflow field of the fan 1 and forms an image in the image acquisition device 10 after passing through the schlieren lens 14 and the knife edge 15; a temperature detection device 17, an impeller rotating speed detection device 18 and an impeller position detection device 19 are further arranged in the casing 2 of the fan 1, the light source 9, the image acquisition device 10, the temperature detection device 17, the impeller rotating speed detection device 18 and the impeller position detection device 19 are all electrically connected with the controller 7, the controller 7 is in communication connection with the upper computer 8, the fan 1, the light source 9, the image acquisition device 10, the temperature detection device 17, the impeller rotating speed detection device 18, the impeller position detection device 19, the controller 7 and the upper computer 8 adopt the prior art, the temperature detection device 17 is a thermocouple, the image acquisition device 10 is a camera, the impeller rotating speed detection device 18 and the impeller position detection device 19 can respectively adopt a speed sensor and a position sensor, and can also adopt the same photoelectric encoder arranged on the motor 6 to perform corresponding conversion to obtain the temperature detection device 18 and the impeller position detection device 19, the core component of the controller 7 is a single chip microcomputer or a DSP, and the upper computer 8 is a computer.
The working principle of the invention is as follows:
the device for detecting the foreign matters in the fan acquires the actual airflow image in the fan 1 in real time through the schlieren imaging component, acquires the running state parameters of the fan 1 including the temperature, the rotating speed of the impeller 3 and the position of the impeller 3 at the same time to acquire the initial airflow image which is stored in the upper computer 8 in advance under the same running state parameters and has no foreign matter disturbance, and judges whether the foreign matters enter the fan 1 or not by comparing the actual airflow image with the initial airflow image through the upper computer 8, when the foreign matters enter the fan 1, the foreign matters can cause certain interference on the airflow in the fan 1, so that the actual airflow image is different from the initial airflow image.
According to the principle that foreign matters entering the fan 1 can affect the airflow in the fan 1, the airflow change in the fan 1 is automatically detected through the schlieren imaging assembly, and the automation level is high; secondly, the schlieren imaging component can visually display the airflow change in an image form, and the intuition is strong; thirdly, the schlieren imaging component is not in direct contact with the fan 1, so that the influence on the air flow in the fan 1 is small, and the accuracy of a detection result can be ensured; and finally, acquiring the initial airflow image under the same operation state parameters and without foreign matter disturbance by acquiring the operation state parameters of the temperature of the fan 1, the rotating speed of the impeller 3 and the position of the impeller 3, so that the initial airflow image with better accuracy and relevance can be obtained, and whether foreign matters enter the fan 1 can be conveniently, quickly and accurately judged by comparing the initial airflow image with the initial airflow image.
Preferably, the casing 2 is made of a transparent material, and the impeller 3 may also be made of a transparent material. This be provided with and do benefit to schlieren formation of image subassembly formation of image to can obtain more accurate testing result.
Preferably, the device further comprises a first seat 20, a second seat 21, and a first XYZ position adjustment device 22 and a second XYZ position adjustment device 23 for driving the first seat 20 and the second seat 21 respectively, the light source 9, the focusing lens 11, the slit 12 and the collimating lens 13 are all installed on the first base 20, the knife edge 15 and the image acquisition device 10 are both installed on the second seat body 21, the first seat body 20 and the second seat body 21 are respectively provided with a first position detection device 24 and a second position detection device 25, the first XYZ position adjustment device 22, the second XYZ position adjustment device 23, the first position detection device 24 and the second position detection device 25 are all electrically connected to the controller 7, the first XYZ-position adjustment device 22, the second XYZ-position adjustment device 23, the first position detection device 24, and the second position detection device 25 may be implemented by conventional techniques. By the arrangement, even when the optical element with smaller size cannot observe the whole observation surface in the fan 1 at the same time, the position of the optical element can still be moved to observe in a time-sharing manner, and as long as the moving speed and the maximum observation visual angle are reasonable, a more accurate detection effect can still be obtained, so that the requirement on the performance of the optical element is reduced; in addition, the detection by the first position detecting device 24 and the second position detecting device 25 is also for obtaining an initial airflow image with good accuracy and correlation.
Preferably, decibel meters 26 are arranged on the upper, lower, left and right sides of the casing 2 of the fan 1, the decibel meters 26 are electrically connected with the controller 7, and the decibel meters 26 can be obtained by adopting the prior art. This arrangement assists in determining whether or not foreign matter enters and the position where foreign matter enters by adding the decibel meter 26, so that the optical element can be adjusted to an appropriate position to observe foreign matter by adjusting the positions of the first XYZ position adjustment device 22 and the second XYZ position adjustment device 23.
Example 2:
a method for detecting foreign matters in a fan is based on the device for detecting foreign matters in the fan in embodiment 1, and comprises the following steps:
(1) the decibel meters 26 arranged at the upper, lower, left and right positions of the shell 2 of the fan 1 collect sound loudness, the sound loudness is uploaded to the upper computer 8 through the controller 7, the upper computer 8 assists in judging whether foreign matters enter and the entering positions of the foreign matters according to the collected sound loudness information in the upper, lower, left and right directions, and the controller 7 controls the first XYZ position adjusting device 22 and the second XYZ position adjusting device 23 to move to adjust the observing positions of the schlieren imaging assembly;
(2) the upper computer 8 controls the schlieren imaging component outside the shell 2 of the fan 1 to start working through the controller 7, a light source 9 of the schlieren imaging component 6 is converged on a slit 12 through a focusing lens 11, a light beam with the size limited by the slit 12 is converted into a parallel light beam through a collimating lens 13, and the parallel light beam transmits an airflow field of the fan 1 and forms an image in an image acquisition device 10 after passing through a schlieren lens 14 and a knife edge 15;
(3) the image acquisition device 10 acquires and uploads an actual airflow image in the fan 1 in real time, and meanwhile, the temperature detection device 17, the impeller rotating speed detection device 18 and the impeller position detection device 19 which are arranged in the shell 2 of the fan 1 acquire the temperature in the fan 1, the rotating speed of the impeller 3 and the position of the impeller 3 in real time, and the first position detection device 24 and the second position detection device 25 detect the positions of the first seat body 20 and the second seat body 21 respectively, wherein the temperature, the rotating speed of the impeller 3, the position of the impeller 3 and the positions of the first seat body 20 and the second seat body 21 form state operation parameters of the fan 1, and accordingly, an initial airflow image which is stored in advance in the upper computer 8 under the same operation state parameters and has no foreign object disturbance is acquired;
(4) the upper computer 8 compares the actual airflow image with the initial airflow image to judge whether foreign matters enter the fan 1, if so, the upper computer 8 controls the fan 1 to stop running through the controller 7, and if not, the foreign matters are ignored.
Claims (6)
1. The utility model provides a detection apparatus of foreign matter in fan which characterized in that: the schlieren imaging device comprises a schlieren imaging component, a controller (7) and an upper computer (8) which are arranged outside a casing (2) of a fan (1), wherein the schlieren imaging component comprises a light source (9) which is arranged at an air inlet (4) close to the front side of the casing (2) and an image acquisition device (10) which is arranged at an air outlet (5) close to the rear side of the casing (2), a focusing lens (11), a slit (12) and a collimating lens (13) are sequentially arranged between the light source (9) and the front side of the casing (2), a schlieren lens (14) and a knife edge (15) are sequentially arranged between the rear side of the casing (2) and the image acquisition device (10), the light source (9), the focusing lens (11), the slit (12), the collimating lens (13), the schlieren lens (14), the knife edge (15) and the image acquisition device (10) are positioned on the same optical axis (16), the slit (12) is positioned on the focal plane of the collimating lens (13), the knife edge (15) is positioned on the focal plane of the schlieren lens (14), the light source (9) is converged on the slit (12) through the focusing lens (11), the light beam with the size limited by the slit (12) is converted into parallel light beam through the collimating lens (13), the parallel light beam transmits through the airflow field of the fan (1) and forms an image in the image acquisition device (10) after passing through the schlieren lens (14) and the knife edge (15); still be equipped with temperature-detecting device (17), impeller rotational speed detection device (18) and impeller position detection device (19) in casing (2) of fan (1), light source (9), image acquisition device (10), temperature-detecting device (17), impeller rotational speed detection device (18) and impeller position detection device (19) all are connected with controller (7) electricity, controller (7) and host computer (8) communication connection.
2. The device according to claim 1, wherein: the shell (2) is made of transparent materials.
3. The device according to claim 1, wherein: the portable optical device comprises a first base body (20), a second base body (21), a first XYZ position adjusting device (22) and a second XYZ position adjusting device (23) which are used for driving the first base body (20) and the second base body (21) respectively, wherein the light source (9), the focusing lens (11), the slit (12) and the collimating lens (13) are all installed on the first base body (20), the knife edge (15) and the image acquisition device (10) are all installed on the second base body (21), the first base body (20) and the second base body (21) are respectively provided with a first position detecting device (24) and a second position detecting device (25), and the first XYZ position adjusting device (22), the second XYZ position adjusting device (23), the first position detecting device (24) and the second position detecting device (25) are all electrically connected with a controller (7).
4. The device according to claim 3, wherein: all be equipped with decibel meter (26) about the upper and lower of casing (2) of fan (1), decibel meter (26) are connected with controller (7) electricity.
5. A method for detecting foreign matters in a fan is characterized by comprising the following steps: it comprises the following steps:
(1) an upper computer (8) controls a schlieren imaging component outside a shell (2) of a fan (1) to start working through a controller (7), a light source (9) of the schlieren imaging component is converged on a slit (12) through a focusing lens (11), a light beam with the size limited by the slit (12) is converted into a parallel light beam through a collimating lens (13), the parallel light beam transmits an airflow field of the fan (1) and is imaged in an image acquisition device (10) after passing through a schlieren lens (14) and a knife edge (15);
(2) the method comprises the steps that an image acquisition device (10) acquires and uploads an actual airflow image inside a fan (1) in real time, and meanwhile, a temperature detection device (17), an impeller rotating speed detection device (18) and an impeller position detection device (19) which are arranged in a shell (2) of the fan (1) acquire state operation parameters such as the temperature in the fan (1), the rotating speed of an impeller (3) and the position of the impeller (3) in real time, so that an initial airflow image which is stored in an upper computer (8) in advance under the same operation state parameters and has no foreign object disturbance is acquired;
(3) the upper computer (8) compares the actual airflow image with the initial airflow image to judge whether foreign matters enter the fan (1), if so, the upper computer (8) controls the fan (1) to stop running through the controller (7), and if not, the fan is ignored.
6. The method for detecting the foreign matter in the fan according to claim 5, wherein: in the step (1), before the upper computer (8) controls the schlieren imaging component outside the casing (2) of the fan (1) through the controller (7) to start working, sound loudness is collected by decibel meters (26) arranged at the upper, lower, left and right positions of the casing (2) of the fan (1) and is uploaded to the upper computer (8) through the controller (7), the upper computer (8) assists to judge whether foreign matters enter and the entering positions of the foreign matters according to the collected sound loudness information in the upper, lower, left and right directions, and the controller (7) controls the first XYZ position adjusting device (22) and the second XYZ position adjusting device (23) to move to adjust the observation position of the schlieren imaging component, the state operation parameters in the step (2) further include the position of the first seat (20) detected by the first position detection device (24) and the position of the second seat (21) detected by the second position detection device (25).
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| CN201911264607.XA CN110954967A (en) | 2019-12-11 | 2019-12-11 | Device and method for detecting foreign matters in fan |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117054040A (en) * | 2023-10-12 | 2023-11-14 | 中国空气动力研究与发展中心超高速空气动力研究所 | Optical system for flow field display of rotary fan blade and testing method |
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