CN117629832B - Particle detection device with air guide function - Google Patents
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Abstract
The invention discloses a particle detection device with an air guide function, which comprises an upper cover, a middle frame and a lower cover, wherein a functional component installation space is formed, a piezoelectric ceramic fan and a light source component are assembled in the functional component installation space, and the light source component is arranged in the installation space; the piezoelectric ceramic fan is arranged in the exhaust passage, the piezoelectric ceramic fan comprises a base, a piezoelectric ceramic sheet group, a vibrating piece and fan wings, one end of the base is connected with the piezoelectric ceramic sheet group, the piezoelectric ceramic sheet group comprises two piezoelectric ceramic sheets clamped mutually, the piezoelectric ceramic sheet group is connected with a power supply through the base, the vibrating piece is clamped between the piezoelectric ceramic sheet groups, one end of each fan wing is connected with the vibrating piece, the other end of each fan wing faces the exhaust port, and the vibrating piece and the fan wings are made of elastic materials. According to the invention, the flow of air flow is accurately controlled by adopting the piezoelectric ceramic fan, so that the uniform distribution of particles in the air in the detection area is ensured, the service life of the particle detection device is prolonged, and the whole energy consumption is reduced.
Description
Technical Field
The invention relates to the technical field of detection equipment, in particular to a particle detection device with an air guiding function.
Background
Particulate pollution in air is a global environmental problem that affects not only human health, but also atmospheric visibility and even climate change. Fine particles such as PM2.5 can penetrate into the lung, influence gas exchange, and cause health problems such as asthma, cardiovascular diseases and the like. Therefore, monitoring the concentration and particle size distribution of particulate matter in air in real time is critical to assessing air quality, developing pollution control strategies, and protecting public health. The particle sensor detects by using the light scattering principle, and when a light beam passes through particles in the air, the path of the light beam changes, so that a scattering phenomenon is generated. These scattered light are captured by the photo receiver and converted into an electrical signal. The concentration of particulate matter can be determined by calculation by the microprocessor. To improve the accuracy and repeatability of the detection, the sensor is typically equipped with an air flow driving component, such as a piezoceramic fan, to provide a steady air flow and to introduce outside air into the detection zone. However, the conventional common air particulate matter detection device often adopts an axial flow fan, a blower, an air pump and other devices driven by a motor based on an electromagnetic principle, and noise and vibration can be generated due to friction between moving parts (such as a rotating shaft and a bearing) in the motor during operation, so that the performance and the service life of the sensor are limited.
Disclosure of Invention
The embodiment of the invention provides a particle detection device with an air guide function, and aims to solve the problem that an air guide structure in the device has short service life in the prior art.
The embodiment of the invention discloses a particle detection device with an air guide function, which comprises an upper cover, a middle frame and a lower cover, wherein the upper cover and the lower cover are respectively covered above and below the middle frame to form a functional component installation space, a piezoelectric ceramic fan and a light source component are assembled in the functional component installation space, and the light source component is arranged in the installation space; the light source component comprises a shading wall surrounded by four sides and a light source piece for generating light, a detection area is arranged in front of the shading wall, the light source piece is arranged on the inner side of the shading wall towards the front wall of the middle frame, a first light passing hole is formed in the front end wall surface of the shading wall, and the light source piece is opposite to the detection area through the first light passing hole; an air inlet is formed by clamping one side wall of the shading wall with one side wall of the middle frame, an exhaust passage is formed by clamping the other side wall of the shading wall with the other side wall of the middle frame, an air inlet and an air outlet are respectively arranged on the rear wall of the middle frame, the rear wall and the front wall are oppositely arranged and are parallel to each other, and the air inlet and the exhaust passage are communicated through a detection area; the piezoelectric ceramic fan is arranged in the exhaust passage, the piezoelectric ceramic fan comprises a base, a piezoelectric ceramic sheet group, a vibrating piece and fan wings, one end of the base is connected with the piezoelectric ceramic sheet group, the piezoelectric ceramic sheet group comprises two piezoelectric ceramic sheets clamped mutually, the piezoelectric ceramic sheet group is connected with a power supply through the base, the vibrating piece is clamped between the piezoelectric ceramic sheet groups, one end of each fan wing is connected with the vibrating piece, the other end of each fan wing faces the exhaust port, and the vibrating piece and the fan wings are made of elastic materials.
Further, the particle detection device also comprises a circuit board, wherein the circuit board is embedded in the lower cover, and the top surface of the circuit board is used for arranging electronic components; the top surface of circuit board is provided with and is bellied connector, and the connector includes a plurality of electric pin link, and the partition wall encloses with the lateral wall of center to form the connector assembly chamber, and the connector wears to locate in the mounting hole that connector assembly chamber department set up, and the connector is connected with the light source subassembly electricity.
Further, the piezoelectric ceramic fan further comprises electrode pins, the electrode pins are arranged at the bottom of the base, pin through holes are formed in the bottom plate of the middle frame, and the electrode pins are electrically connected with electronic components on the circuit board through the pin through holes.
Further, the light source assembly comprises a lens and a photoelectric receiving tube; the illumination direction of the light source piece faces the detection area, the light shielding plate is arranged on the outer side wall surface of the light shielding wall, the lens is arranged on the illumination direction of the light source piece, and the photoelectric receiving tube is arranged in the detection area and faces the lens.
Further, the illumination direction of the light source piece is parallel to the extending direction of the fan wing.
Further, an MCU module, a communication interface chip and a voltage conversion chip are arranged on the top surface of the circuit board, the communication interface chip is externally connected with a control module, and the voltage conversion chip is connected with the piezoelectric ceramic fan through an electrode pin.
Further, a light isolation plate arranged on one side close to the front wall is enclosed with the outer side wall of the middle frame to form a extinction darkroom, a second light passing hole is formed in the extinction darkroom, and the second light passing hole is opposite to the light source piece so as to guide light into the extinction darkroom through the second light passing hole.
Further, the upper cover is provided with a control surface frame, the control surface frame is opposite to the connector through the mounting hole of the middle frame, and the connector stretches out of the upper cover through the control surface frame.
Further, the light source component is arranged in the middle of the middle frame, and separates the middle frame to form an air inlet channel and an air outlet channel.
Further, a piezoelectric ceramic fan is arranged in the air inlet channel and comprises fan wing blades, one ends of the fan wing blades are connected to the base through piezoelectric ceramic sheet groups, and the other ends face to the air inlet flow direction of the air to be detected.
The particle detection device with the air guide function reduces complex mechanical structures and transmission parts, reduces the volume and weight of the device, and ensures that the structure is more compact and concise. Due to the elimination of mechanical friction and electromagnetic noise, the noise generated by the device in operation is greatly reduced, and the comfort and environmental friendliness in use are improved. The piezoelectric ceramic fan has no mechanical abrasion, long service life, reduced replacement frequency and maintenance cost, and improved durability and reliability of the device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a particle detection device with an air guiding function according to an embodiment of the present invention;
FIG. 2 is an exploded schematic view of the overall structure of a particle detection device with an air guiding function according to an embodiment of the present invention;
fig. 3 is a schematic partial structure diagram of a particle detection device with an air guiding function according to an embodiment of the present invention;
Fig. 4 is a schematic partial structure diagram of a particle detection device with an air guiding function according to an embodiment of the present invention;
Fig. 5 is a schematic partial structure diagram of a particle detection device with an air guiding function according to an embodiment of the present invention;
fig. 6 is a schematic partial structure diagram of a particle detection device with an air guiding function according to an embodiment of the present invention.
Reference numerals:
1. An upper cover; 2. a middle frame; 3. a lower cover; 4. a piezoelectric ceramic fan; 20. a light shielding wall; 21. a front wall; 22. a rear wall; 23. a first via; 24. an air inlet channel; 25. an exhaust passage; 26. an air inlet; 27. an exhaust port; 41. a base; 42. a piezoelectric ceramic sheet group; 43. a vibrating piece; 44. fan wing leaves; 45. an electrode pin; 5. a circuit board; 51. a connector; 28. a mounting hole; 291. a lens; 292. a photoelectric receiving tube; 293. a extinction darkroom; 294. a detection zone; 295. a light source member; 11. and controlling the face frame.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As shown in fig. 1 to 6, the particle detecting device with air guiding function provided in this embodiment includes an upper cover 1, a middle frame 2 and a lower cover 3, wherein the upper cover 1 and the lower cover 3 are respectively covered above and below the middle frame 2 to form a functional component installation space, a piezoelectric ceramic fan 4 and a light source component are assembled in the functional component installation space, and the light source component is arranged in the installation space; the light source assembly comprises a shading wall 20 which is surrounded by four sides and a light source member 295 for generating light, a detection area 294 is arranged in front of the shading wall 20, the light source member 295 is arranged on the inner side of the shading wall 20 towards the front wall 21 of the middle frame 2, a first light passing hole 23 is arranged on the front end wall surface of the shading wall 20, and the light source member 295 is opposite to the detection area 294 through the first light passing hole 23; an air inlet 24 is formed by clamping one side wall of the shading wall 20 and one side wall of the middle frame 2, an air outlet 25 is formed by clamping the other side wall of the shading wall 20 and the other side wall of the middle frame 2, an air inlet 26 and an air outlet 27 are respectively arranged on the rear wall 22 of the middle frame 2, the rear wall 22 and the front wall 21 are oppositely arranged and are parallel to each other, and the air inlet 24 and the air outlet 25 are communicated through a detection area 294; the piezoelectric ceramic fan 4 is arranged in the exhaust passage 25, the piezoelectric ceramic fan 4 comprises a base 41, a piezoelectric ceramic sheet group 42, vibration pieces 43 and fan wings 44, one end of the base 41 is connected with the piezoelectric ceramic sheet group 42, the piezoelectric ceramic sheet group 42 comprises two piezoelectric ceramic sheets clamped mutually, the piezoelectric ceramic sheet group 42 is connected with a power supply through the base 41, the vibration pieces 43 are clamped between the piezoelectric ceramic sheet groups 42, one end of each fan wing 44 is connected with the vibration piece 43, the other end faces the exhaust port 27, and the vibration pieces 43 and the fan wings 44 are made of elastic materials.
In an actual use scenario, the particle detection device with the air guiding function is used for detecting tiny particles in air. The design structure mainly comprises three parts of an upper cover 1, a middle frame 2 and a lower cover 3, wherein the three parts are tightly combined to form an installation space of a functional component. In this installation space, the device is equipped with a piezoceramic fan 4 and a light source assembly, which are core components for particle detection. The light source assembly is uniquely designed and consists of four surrounding light shielding walls 20, wherein the four light shielding walls 20 enclose a detection region 294. A light source member 295 is provided in front of the light shielding wall 20, i.e., in front of the detection region 294, for emitting light. The light emitted from the light source 295 irradiates the detection area 294 through the first light passing hole 23 on the light shielding wall 20, thereby irradiating the detection area 294 with light. The light source member 295 is provided on the inner side of the light shielding wall 20, i.e., toward the front wall 21 of the center 2. The light emitted from the light source member 295 is irradiated to the detection region 294 through the first light passing hole 23. The purpose of this design is to prevent interference from external light, ensuring that only light from the detection region 294 is received by the light source assembly. An air inlet 24 is formed by sandwiching one side wall of the shade wall 20 with one side wall of the middle frame 2. Also, an exhaust passage 25 is formed by sandwiching between the other side wall of the shielding wall 20 and the other side wall of the middle frame 2. The design of these two airways allows one-way flow of air, carrying particulate matter through the detection zone 294. The rear wall 22 of the center frame 2 is provided with an intake port 26 and an exhaust port 27. The two ports are designed so that air can flow unidirectionally to form an air stream. In the case where the rear wall 22 is disposed opposite and parallel to the front wall 21, the intake passage 24 and the exhaust passage 25 communicate through the detection region 294. The exhaust duct 25 is provided with a piezoceramic fan 4, which is another core component of the particle detection device. The piezoelectric ceramic fan 4 includes a base 41, a piezoelectric ceramic sheet group 42, a vibration plate 43, and fan blades 44. One end of the base 41 is connected with a piezoelectric ceramic sheet group 42, and the piezoelectric ceramic sheet group 42 comprises two piezoelectric ceramic sheets clamped together. The piezoelectric ceramic sheet group 42 is connected to a power supply through the base 41, the vibrating piece 43 is sandwiched between the piezoelectric ceramic sheet groups 42, one end of the fan fin 44 is connected to the vibrating piece 43, and the other end faces the exhaust port 27. The vibration plate 43 and the fan wing 44 are made of elastic materials, and the design enables the piezoelectric ceramic fan 4 to vibrate when being driven by a power supply, so that air flow is formed and air flow is controlled. The particle detection device with the air guide function can effectively identify and monitor tiny particles in the air through precise air flow control and optical signal detection, and has important application value in the fields of environmental monitoring, industrial control and the like. Air containing particulate matter from the outside enters the interior of the sensor through air inlet 26. After entering the sensor, air is directed through the inlet 24 to the detection zone 294. The design of the inlet 24 ensures that air flows evenly to the detection zone 294. This is the area of intersection of the gas path module and the light path module. In this region, the particulate matter in the air is irradiated by the light source in the optical path module, and the concentration of the particulate matter is detected by the change of the optical signal. The fan is installed in the exhaust passage 25 or the intake passage 24 to provide driving force for air circulation. The vibrating fins of the piezoceramic fan 4 will be directed in the direction of the air flow depending on the mounting position to ensure an efficient flow of air. After passing through the detection zone 294, the air exits the sensor through the exhaust passage 25. The design of the exhaust duct 25 also needs to ensure that the air flows out evenly. Through the exhaust port 27, air is exhausted outside the sensor, completing the ventilation cycle of the air under test. The mounting position of the piezo ceramic fan 4 affects the direction of air flow. If a fan is installed in the exhaust duct 25, its vibrating fins will be directed toward the exhaust port 27, helping the air to flow out; if installed in the inlet duct 24, the vibrating fins would face away from the inlet port 26, helping air flow. This design allows for more efficient air flow while also ensuring air circulation in the detection zone 294, improving the accuracy and efficiency of particulate matter detection. Through such gas circuit design, the sensor can realize the real-time detection of particulate matter concentration in the outside air, owing to adopted piezoceramics fan 4 moreover, whole gas circuit system need not mechanical transmission part, has reduced maintenance cost and running noise, has improved the stability and the reliability of equipment.
In summary, by adopting the piezoelectric ceramic fan 4, the invention reduces the complex mechanical structure and transmission parts, reduces the volume and weight of the device, and makes the structure more compact and concise. Due to the elimination of mechanical friction and electromagnetic noise, the noise generated by the device in operation is greatly reduced, and the comfort and environmental friendliness in use are improved. The piezoelectric ceramic fan 4 has no mechanical abrasion, long service life, reduced replacement frequency and maintenance cost, and improved durability and reliability of the device. Because the mechanical friction is not needed to be overcome, the device has lower power consumption during operation, and the energy utilization efficiency is improved. The piezoelectric ceramic fan 4 does not need lubricating grease, is high-temperature resistant, cannot cause performance degradation due to a high-temperature environment, and is suitable for continuous operation in the high-temperature environment. Because the traditional motor is not used, the device of the invention can not generate electromagnetic interference and can not negatively affect other electronic equipment in the environment. The piezoelectric ceramic fan 4 is adopted as an airflow driving component, so that the resolution of technological innovation and replacement of the traditional technology is embodied. The piezoelectric ceramic fan 4 has high response speed and high control precision, and can realize rapid and accurate air flow control. The device of the present invention, due to its unique structure and materials, is capable of stable operation in a variety of environments, including high temperature, high humidity or corrosive gas environments. Because the device has a simple structure and does not need lubrication and maintenance, the device has low maintenance cost in the use process and is friendly to users. The device is energy-saving and environment-friendly during operation, and meets the requirement of sustainable development due to low power consumption and no need of lubricating grease. The device of the invention is suitable for various occasions such as air quality monitoring, particulate matter detection of industrial production lines and the like due to the characteristics of miniaturization, low noise and high stability.
Further, the particle detection device further comprises a circuit board 5, the circuit board 5 is embedded in the lower cover 3, and the top surface of the circuit board 5 is used for arranging electronic components; the top surface of the circuit board 5 is provided with a connector 51 in a protruding shape, the connector 51 comprises a plurality of electric pin connecting ends, and the partition wall and the outer side wall of the middle frame 2 are enclosed to form a connector 51 assembling cavity; the connector 51 is inserted into a mounting hole provided at the connector assembly cavity, and the connector 51 is electrically connected with the light source assembly.
Specifically, the circuit board 5 is embedded in the lower cover 3, and provides a stable mounting platform for electronic components. The circuit board 5 is typically made of an insulating material such as epoxy or polyimide, etc., to ensure electrical isolation between the electronic components. The top surface of the circuit board 5 is used for providing various electronic components such as integrated circuits, transistors, resistors, capacitors, etc. These components are the core of the particle detection apparatus operation, and they process the signals from the sensors, performing the computing and control functions. The connector 51 is a member for electrically connecting the circuit board 5 to external devices such as a light source module. The connector 51 is generally designed to be male to facilitate insertion and extraction and includes a plurality of electrical pin terminals to facilitate transmission of multiple signals. The electrical pin connection end of the connector 51 is an electrical interface between the circuit board 5 and an external device. These pins are arranged according to design requirements to accommodate different circuit connection requirements. The mounting hole 28 of the middle frame 2 is designed for the connector 51 on the circuit board 5, so that the connector 51 can be firmly penetrated and reliably electrically connected with external equipment such as a light source assembly and the like. The connector 51 is electrically connected to the light source module to provide the light source module with the required power and control signals. Thus, the light source assembly can operate according to the instruction sent by the electronic component on the circuit board 5, such as turning on or off the light source, adjusting brightness, etc. The circuit board 5 not only provides a stable mounting platform for electronic components, but also enables reliable connection with external devices such as a light source assembly through the connector 51. This design makes the electronics of the particle detection apparatus more compact, efficient, and convenient to maintain and replace. Meanwhile, the trend of miniaturization and integration of modern electronic equipment is reflected, and the requirements of technological innovation and sustainable development are met.
Further, the piezoelectric ceramic fan 4 further includes an electrode pin 45, the electrode pin 45 is disposed at the bottom of the base 41, a pin through hole is disposed on the bottom plate of the middle frame 2, and the electrode pin 45 is electrically connected with the electronic component on the circuit board 5 through the pin through hole.
Specifically, the electrode pins 45 of the piezoceramic fan 4 are interfaces for electrical connection between the fan and the circuit board 5. These pins are typically located at the bottom of the fan base 41 for connection with the electronic components on the circuit board 5. The electrode pins 45 are provided at the bottom of the base 41, which is designed to help maintain the stability and reliability of the fan while facilitating connection with the circuit board 5. The bottom plate of the middle frame 2 is provided with pin through holes for allowing the electrode pins 45 to pass through the bottom plate and connect with the electronic components on the circuit board 5. The design of the pin through holes needs to be matched with the size of the electrode pins 45 to ensure that the electrode pins 45 can be firmly penetrated therein and to realize good electrical connection with the electronic components on the circuit board 5. The electrode pins 45 are electrically connected to the electronic components on the circuit board 5 through pin through holes. These electronic components may be integrated circuits, transistors, resistors, capacitors, etc. that are responsible for controlling the fan, such as switches, speed regulation, directional control, etc. The electronic components on the circuit board 5 can send control signals to the piezoelectric ceramic fan 4 to control the running state of the fan. Meanwhile, the running state of the fan can be fed back to the circuit board 5 through the electrode pins 45, so that closed-loop control is realized. Through the design, the piezoelectric ceramic fan 4 of the particle detection device can effectively communicate and control with electronic components on the circuit board 5, so that the operation of the fan is more flexible and accurate. The electrical connection mode not only improves the overall performance of the equipment, but also enhances the reliability and maintainability of the equipment.
Further, the light source assembly includes a lens 291 and a photo receiver 292; the light source 295 is illuminated in the direction toward the detection area 294, the light shielding plate is provided on the outer wall surface of the light shielding wall 20, the lens 291 is disposed in the light source 295, and the photoelectric receiver 292 is disposed in the detection area 294 and faces the lens 291.
In particular, the light source assembly typically includes one or more light emitting elements, such as LED lamps, laser diodes, etc., and associated optical elements, such as lenses 291. The lens 291 is used for focusing or dispersing the light emitted from the light source to adapt to the requirements of the detection region 294. The design of the lens 291 may adjust the distribution and intensity of light according to different optical requirements. A photo-receiving tube 292 (e.g., photodiode, photomultiplier tube, etc.) is positioned within the detection region 294 and directed toward the lens 291. When light is irradiated to the detection region 294 through the lens 291, the photo receiver tube 292 can receive a light signal reflected from particles of the detected gas. The light source 295 is disposed in the light shielding wall 20 of the middle frame 2, and the indoor design is to control the light propagation and reflection, so as to reduce the interference of external light and improve the detection accuracy. The light source member 295 is illuminated in a direction toward the detection zone 294, which is designed to ensure that light is efficiently directed onto the particles of the gas being detected. The outer side wall surface of the light shielding wall 20 is provided with a light shielding plate for blocking external light from entering the light shielding wall 20, thereby reducing interference, ensuring that the photo receiver tube 292 can accurately receive the optical signal focused by the lens 291. The detection region 294 is the working area of the photo-receiving cell 292 where particles of the detected gas are placed, and the photo-receiving cell 292 is capable of detecting optical signals reflected by an object. By such a design, the light source assembly is capable of providing stable illumination for the particle detection device and accurately capturing reflected light from objects within the detection region 294 via the light receiving photocell 292. This configuration is very common in applications such as particle detection, counting and sorting, as it can provide detection capabilities of high efficiency and accuracy. In addition, the design of the light shielding plate also ensures the reliability of the detection process, and avoids the interference of external light on the detection result.
Further, the light direction of the light source member 295 is parallel to the extending direction of the fan fin 44.
Specifically, when the illumination direction of the light source is parallel to the extending direction of the fan fin 44, it is possible to ensure that the light is uniformly irradiated to the detection region 294. This arrangement helps to reduce the dead zone of illumination and improve the accuracy and reliability of detection. The direction of extension of the fan blades 44 is generally perpendicular to the axis of rotation of the fan. If the light source is illuminated in a direction parallel to the fan blades 44, the light can be directed to a wider area by the air flow generated by the fan when the light irradiates the detection area 294, thereby improving the detection efficiency. The design can also reduce the influence of air flow generated by the rotation of the fan on the irradiation direction of the light source, thereby reducing light scattering and reflection caused by air flow disturbance and improving the detection stability. The parallel design of the light source 295 and the fan fin 44 helps to realize the modularization of the device, so that the light source and the fan can be independently replaced and maintained, and the flexibility and maintainability of the device are improved. This design also makes more efficient use of space, since the light source and the fan can be compactly arranged in the same plane, thereby saving volume and weight of the device. It also helps to improve thermal management if the light source and fan blades 44 are arranged in parallel. The fan can help radiating when working, prevents the light source from overheating, prolongs the service life of equipment. In practical applications, the design needs to consider factors such as the rotation speed of the fan, the airflow speed, the brightness of the light source, and the like, so as to ensure that the illumination effect of the light source and the airflow guiding effect of the fan are optimal. At the same time, the overall design and manufacturing process of the device also need to be considered to ensure stability and durability of the apparatus.
Further, an MCU module, a communication interface chip, and a voltage conversion chip are disposed on the top surface of the circuit board 5, the communication interface chip is externally connected with a control module, and the voltage conversion chip is connected with the piezoelectric ceramic fan 4 through an electrode pin 45.
In particular, the MCU module is the core processing unit of the device, typically comprising one or more microcontrollers, such as an STM32 series microcontroller. These microcontrollers are responsible for executing the software programs of the device, controlling the switching of the light source, the rotation of the fan, the acquisition and processing of data, etc. The communication interface chip provides an interface for communicating with other systems or devices. This may be a wireless communication module, such as Wi-Fi, bluetooth, zigBee, etc., or a wired communication interface, such as USB, RS-232, I2C, SPI, etc. The communication interface chip enables the device to transmit detected data to an external system or receive a control command of the external system. The voltage conversion chip is responsible for converting the supply voltage to the voltage level required by the different components on the circuit board 5. For example, some components may require 3.3V, while other components may require 5V or higher. The voltage conversion chip ensures that all components can operate at the proper voltage. The communication interface chip is externally connected with a control module, which may be an external control unit connected with the communication interface chip, such as a PC, a smart phone or other smart devices, which may interact with the particle detection device through a communication interface. The voltage conversion chip is connected with the piezoelectric ceramic fan 4 through an electrode pin 45. The connection mode enables the MCU module to control the operation of the piezoelectric ceramic fan 4 through the voltage conversion chip so as to adjust the air flow and the temperature.
Further, a light-blocking plate arranged near one side of the front wall encloses with the outer side wall of the middle frame 2 to form a extinction darkroom 293, a second light-passing hole is arranged on the extinction darkroom 293, and the second light-passing hole is opposite to the light source 295 so as to guide light into the extinction darkroom 293 through the second light-passing hole.
Specifically, the extinction darkroom 293 is an enclosed space inside the middle frame 2, and is designed to reduce or eliminate interference of external light on the detection process. This is typically achieved by using special materials and structures such as light absorbing materials, matting coatings or light barriers. The light barrier is part of the extinction chamber 293, which separates the extinction chamber 293 from the detection zone 294 and the air inlet 24. The light blocking plate functions to block external light from entering the extinction dark room 293 while allowing light emitted from the light source member 295 to pass therethrough. The second light passing hole is arranged on the light isolating plate, and is opposite to the light source 295 and used for accessing light. The purpose of this design is to ensure that the light from the light source is properly directed to the detection zone 294 while preventing external light from entering the extinction darkroom 293. Light emitted by the light source 295 enters the detection area 294 through the second light passing hole, so that the light only irradiates on particles of detected gas, interference of background light is reduced, and detection accuracy is improved. The extinction chamber 293 is designed such that the detection zone 294 is completely isolated so that particle detection can be performed without any external light interference. The air inlet 24 is also isolated by a light barrier to prevent external light from entering the extinction darkroom 293 through the air inlet 24. Through the design, the particle detection device can work in a very stable and controllable environment, and the detection accuracy and repeatability are greatly improved.
Further, the upper cover 1 is provided with a control panel frame 11, the control panel frame 11 is opposite to the connector 51 through the mounting hole 28 of the middle frame 2, and the connector 51 extends out of the upper cover 1 through the control panel frame 11.
Specifically, the extinction darkroom 293 is an enclosed space inside the middle frame 2, and is designed to reduce or eliminate interference of external light on the detection process. This is typically achieved by using special materials and structures such as light absorbing materials, matting coatings or light barriers. The light barrier is part of the extinction chamber 293, which separates the extinction chamber 293 from the detection zone 294 and the air inlet 24. The light blocking plate functions to block external light from entering the extinction dark room 293 while allowing light emitted from the light source member 295 to pass therethrough. The second light passing hole is arranged on the light isolating plate, and is opposite to the light source 295 and used for accessing light. The purpose of this design is to ensure that the light from the light source is properly directed to the detection zone 294 while preventing external light from entering the extinction darkroom 293. Light emitted by the light source 295 enters the detection area 294 through the second light passing hole, so that the light only irradiates on particles of detected gas, interference of background light is reduced, and detection accuracy is improved. The extinction chamber 293 is designed such that the detection zone 294 is completely isolated so that particle detection can be performed without any external light interference. The air inlet 24 is also isolated by a light barrier to prevent external light from entering the extinction darkroom 293 through the air inlet 24.
Further, a light source assembly is disposed in the middle of the middle frame 2, and the light source assembly separates the middle frame 2 to form an air inlet 24 and an air outlet 25.
Further, a piezoelectric ceramic fan 4 is disposed in the air inlet 24, the piezoelectric ceramic fan 4 includes a fan fin 44, one end of the fan fin 44 is connected to the base 41 through the piezoelectric ceramic sheet set 42, and the other end faces the air inlet flowing direction of the air to be detected.
Specifically, the upper cover 1 and the lower cover 3 form an installation space by closing, and this space is used to accommodate the middle frame 2 and other internal components. This design makes the internal structure of the device more compact and also facilitates maintenance and cleaning. The middle frame 2 is embedded in the installation space, and is generally responsible for supporting and fixing key components such as the circuit board 5, the light source assembly, the photoelectric receiving tube 292, and the like. The center 2 is designed to have sufficient stability and strength to withstand vibration and shock in everyday use. The inlet channel 24 is the part of the device for introducing the gas to be detected. In particle detection devices, the inlet 24 is designed to ensure that gas flows uniformly through the detection region 294 to facilitate accurate detection of particles. Piezoceramic fan 4 is an important component within air intake 24 and is used to generate an air flow to help direct the air through detection region 294. Such fans are typically composed of piezoelectric ceramic foil sets 42 that control the rotation of the fan through voltage variations. The fan blades 44 are the key parts of the fan, and one ends of the fan blades are connected to the base 41 through the piezoelectric ceramic sheet set 42, and the other ends face the inlet flow direction of the gas to be detected. The purpose of this design is to effectively direct the flow of gas to ensure that the gas is evenly distributed to the detection zone 294. The piezoceramic sheet stack 42 is the power source for the fan and controls the speed and direction of the fan by varying the voltage. The control mode can realize accurate fan control so as to adapt to different detection requirements. By means of the design, the particle detection device can achieve efficient and accurate particle detection. The use of the piezo ceramic fan 4 provides a flexible and responsive manner of airflow control that helps to improve the accuracy and repeatability of the detection.
The invention discloses a particle detection device with an air guide function, which comprises an upper cover 1, a middle frame 2 and a lower cover 3, wherein the upper cover 1 and the lower cover 3 are respectively covered above and below the middle frame 2 to form a functional component installation space, a piezoelectric ceramic fan 4 and a light source component are assembled in the functional component installation space, and the light source component is arranged in the installation space; the light source assembly comprises a shading wall 20 surrounded by four sides, a detection area 294 is arranged in front of the shading wall 20, a light source member 295 which faces the front wall 21 of the middle frame 2 and is used for generating light rays is arranged on the inner side of the shading wall 20, a first light passing hole 23 is arranged on the front end wall surface of the shading wall 20, and the light source member 295 is opposite to the detection area 294 through the first light passing hole 23; an air inlet 24 is formed by clamping one side wall of the shading wall 20 and one side wall of the middle frame 2, an air outlet 25 is formed by clamping the other side wall of the shading wall 20 and the other side wall of the middle frame 2, an air inlet 26 and an air outlet 27 are respectively arranged on the rear wall 22 of the middle frame 2, the rear wall 22 and the front wall 21 are oppositely arranged and are parallel to each other, and the air inlet 24 and the air outlet 25 are communicated through a detection area 294; the piezoelectric ceramic fan 4 is arranged in the exhaust passage 25, the piezoelectric ceramic fan 4 comprises a base 41, a piezoelectric ceramic sheet group 42, vibration pieces 43 and fan wings 44, one end of the base 41 is connected with the piezoelectric ceramic sheet group 42, the piezoelectric ceramic sheet group 42 comprises two piezoelectric ceramic sheets clamped mutually, the piezoelectric ceramic sheet group 42 is connected with a power supply through the base 41, the vibration pieces 43 are clamped between the piezoelectric ceramic sheet groups 42, one end of each fan wing 44 is connected with the vibration piece 43, the other end faces the exhaust port 27, and the vibration pieces 43 and the fan wings 44 are made of elastic materials. The technical scheme based on the piezoelectric ceramic fan 4 solves the following key technical problems in the particle detection device: by controlling the flow of the air flow using the piezo ceramic fan 4, the solution ensures that the particulate matter in the air is evenly distributed within the detection zone 294, which helps to improve the accuracy and repeatability of the particulate matter detection. The piezo ceramic fan 4 can precisely control the intensity and direction of the air flow, which helps to achieve rapid air flow switching and adjustment, thereby improving the efficiency and flexibility of detection. The piezo ceramic fan 4 generally has a lower power consumption, which is important for extending the battery life of the particle detection device and reducing the overall power consumption. The piezoelectric ceramic fan 4 can quickly respond to the change of the electric signal, so that the instant air flow control is realized, which is important for the application of detecting the particles needing quick response. The small size of the piezoceramic fan 4 facilitates integration into a compact circuit board 5 design, which facilitates miniaturization and portability of the particle detection device. The low noise generated by the piezo ceramic fan 4 when in operation compared to conventional mechanical fans makes the particle detection device more suitable for applications where a quiet environment is required. The piezoceramic fan 4 has no mechanical moving parts and therefore has a low failure rate, which contributes to an improvement in the reliability and long-term stability of the particle detection apparatus. Due to the modular design of the piezo ceramic fans 4, they are easy to replace and maintain, which helps to reduce the long-term operating costs of the particle detection device.
The present invention is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications and substitutions are intended to be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. A particle detection device with air guiding function, characterized by comprising:
The upper cover and the lower cover are respectively covered above and below the middle frame to form a functional component installation space, the piezoelectric ceramic fan and the light source component are assembled in the functional component installation space, and the light source component is arranged in the installation space;
the light source assembly comprises a shading wall and a light source piece, wherein the shading wall is surrounded by four sides, the light source piece is used for generating light, a detection area is arranged in front of the shading wall, the light source piece is arranged on the inner side of the shading wall towards the front wall of the middle frame, a first light passing hole is formed in the front end wall surface of the shading wall, and the light source piece is opposite to the detection area through the first light passing hole;
An air inlet is formed by clamping one side wall of the shading wall with one side wall of the middle frame, an exhaust passage is formed by clamping the other side wall of the shading wall with the other side wall of the middle frame, an air inlet and an air outlet are respectively arranged on the rear wall of the middle frame, the rear wall and the front wall are oppositely arranged and are parallel to each other, and the air inlet and the exhaust passage are communicated through the detection area;
The piezoelectric ceramic fan is arranged in the exhaust passage and comprises a base, a piezoelectric ceramic sheet group, a vibrating piece and fan wings, one end of the base is connected with the piezoelectric ceramic sheet group, the piezoelectric ceramic sheet group comprises two piezoelectric ceramic sheets clamped mutually, the piezoelectric ceramic sheet group is connected with a power supply through the base, the vibrating piece is clamped between the piezoelectric ceramic sheet groups, one end of each fan wing is connected with the vibrating piece, the other end of each fan wing faces the exhaust port, and the vibrating piece and the fan wings are made of elastic materials.
2. The particle detection device with air guiding function of claim 1, further comprising a circuit board embedded in the lower cover;
The top surface of the circuit board is provided with a connector in a convex shape, the connector comprises a plurality of electric pin connecting ends, and a separation wall and the outer side wall of the middle frame are enclosed to form a connector assembly cavity;
the connector is arranged in the mounting hole arranged at the connector assembly cavity in a penetrating mode, and the connector is electrically connected with the light source assembly.
3. The particle detection device with the air guiding function according to claim 2, wherein the piezoelectric ceramic fan further comprises an electrode pin, the electrode pin is arranged at the bottom of the base, a pin through hole is formed in the bottom plate of the middle frame, and the electrode pin is electrically connected with an electronic component on the circuit board through the pin through hole.
4. The particle detection device with air guiding function of claim 1, wherein the light source assembly comprises a lens and a photoelectric receiving tube;
the illumination direction of the light source piece faces the detection area, a light shielding plate is arranged on the outer side wall surface of the light shielding wall, the lens is arranged on the illumination direction of the light source piece, and the photoelectric receiving tube is arranged in the detection area and faces the lens.
5. The particle detecting apparatus with air guiding function according to claim 4, wherein the light direction of the light source member is parallel to the extending direction of the fan fin.
6. The particle detection device with the air guiding function according to claim 3, wherein the MCU module, the communication interface chip and the voltage conversion chip are arranged on the top surface of the circuit board, the communication interface chip is externally connected with the control module, and the voltage conversion chip is connected with the piezoelectric ceramic fan through electrode pins.
7. The particle detection device with the air guide function according to claim 1, wherein a light isolation plate arranged near one side of the front wall is enclosed with the outer side wall of the middle frame to form a extinction darkroom, a second light passing hole is arranged on the extinction darkroom, and the second light passing hole is opposite to the light source piece and used for guiding light into the extinction darkroom through the second light passing hole.
8. The particle detecting apparatus with the air guiding function according to claim 2, wherein the upper cover is provided with a control surface frame, the control surface frame is opposite to the connector through a mounting hole of the middle frame, and the connector extends out of the upper cover through the control surface frame.
9. The particle detection device with the air guiding function according to claim 1, wherein the light source assembly is arranged in the middle of the middle frame, and the light source assembly separates the middle frame to form the air inlet passage and the air outlet passage.
10. The particle detection device with the air guiding function according to claim 1, wherein the piezoelectric ceramic fan is arranged in the air inlet channel, the piezoelectric ceramic fan comprises fan wing blades, one ends of the fan wing blades are connected to the base through the piezoelectric ceramic sheet group, and the other ends face to the air inlet flow direction of the air to be detected.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207123471U (en) * | 2017-09-20 | 2018-03-20 | 锦州海伯伦汽车电子有限公司 | A kind of laser type dust sensor based on MODBUS agreements |
| CN210269534U (en) * | 2019-07-30 | 2020-04-07 | 东莞乐博思智能科技有限公司 | Laser particle sensor |
| CN116301257A (en) * | 2023-02-22 | 2023-06-23 | 苏州浪潮智能科技有限公司 | Heat dissipation assembly and heat dissipation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20200011779A1 (en) * | 2016-09-29 | 2020-01-09 | Clad Innovations Ltd. | Highly integrated optical particle counter (opc) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207123471U (en) * | 2017-09-20 | 2018-03-20 | 锦州海伯伦汽车电子有限公司 | A kind of laser type dust sensor based on MODBUS agreements |
| CN210269534U (en) * | 2019-07-30 | 2020-04-07 | 东莞乐博思智能科技有限公司 | Laser particle sensor |
| CN116301257A (en) * | 2023-02-22 | 2023-06-23 | 苏州浪潮智能科技有限公司 | Heat dissipation assembly and heat dissipation method |
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