A three-in-one laser environmental monitoring sensor

Abstract

The utility model relates to sensor technical field discloses a kind of three-in-one laser environment monitoring sensors, including shell, humidity detection module, particulate matter detection module are installed on shell, shell includes: upper shell group;Frame, frame includes frame body, shunt is provided on frame body, airway baffle, airway baffle and lower shell cooperate to form main air duct, secondary air duct;Lower shell group.The utility model is designed by main, secondary air duct, optimizes airflow path, to ensure that airflow high-efficiency flows through heating element, to realize active heat dissipation;Different shapes annular groove structure design is used, effectively blocks the heat conduction path on PCB board, reduces the influence of heat diffusion;Different shapes groove baffle structure design is used, reduce the influence of heat radiation to temperature and humidity module, improve equipment stability;Active heat dissipation, heat conduction block and heat radiation protection three dimensions are respectively proposed innovative solution.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically, a three-in-one laser environmental monitoring sensor. Background Technology

[0002] Against the backdrop of the synergistic development of Industry 4.0 and the Internet of Things (IoT), integrated environmental sensors have become a key carrier for technological upgrading and a new trend in industry development. To achieve a comprehensive assessment of air quality, these sensors not only need to monitor particulate matter concentrations (especially PM2.5) in real time, but also accurately capture changes in temperature and humidity in the environment. By acquiring this crucial data, we can gain a more accurate understanding of air quality, thereby providing more scientific and reasonable suggestions for improving people's living and working environments.

[0003] The current mainstream technical solution adopts a design architecture that directly integrates the temperature and humidity module onto the motherboard of the laser particulate sensor to achieve multi-functional monitoring. However, this integration method has certain problems. First, there are structural design defects: built-in integration is limited by the sensor package size, resulting in a more complex layout and spatial structure; external combination requires additional protective structures, further increasing system complexity. Second, there is the problem of thermal interference: internal heat-generating components (such as the laser driving circuit) generate a temperature rise effect, causing baseline drift in temperature and humidity measurements, which cannot meet the requirements of high-precision measurement. Utility Model Content

[0004] The purpose of this invention is to provide a three-in-one laser environmental monitoring sensor to solve the problems of unreasonable structural design and severe thermal interference in existing solutions.

[0005] This utility model is achieved through the following technical solution: a three-in-one laser environmental monitoring sensor, including a housing, a PCBA and a fan installed inside the housing, a temperature and humidity detection module and a particulate matter detection module installed on the PCBA, an air duct provided on the housing, the air duct connecting an exhaust port, an air inlet and a diversion port provided on the housing, the fan being installed at the exhaust port, the air duct including a guide air duct, a main air duct and a secondary air duct, one end of the guide air duct being connected to the air inlet and the other end being connected to the diversion port, one end of the main air duct and the secondary air duct being connected to the exhaust port and the other end being connected to the diversion port; the main air duct is used for the particulate matter detection module to perform detection; the secondary air duct is used to actively exhaust the heat generated by the particulate matter detection module.

[0006] Preferably, the housing comprises:

[0007] The upper shell assembly includes an upper shell, and the exhaust port and air inlet port are disposed on the upper shell;

[0008] The frame includes a frame body, on which the PCBA and fan are mounted; the PCBA is mounted on the frame body; the shunt port is disposed on the frame body.

[0009] Lower shell assembly, the lower shell assembly including a lower shell;

[0010] The frame is equipped with an air duct baffle, which cooperates with the upper shell and the lower shell to form the air guide duct, the main air duct, and the secondary air duct.

[0011] Preferably, the temperature and humidity detection module includes a temperature and humidity sensor, and the particulate matter detection module includes an LDO, a laser emitter, and a photoelectric conversion unit. The temperature and humidity sensor, LDO, laser emitter, and photoelectric conversion unit are all connected to the PCBA. The LDO and laser emitter are located on the secondary air duct, and the temperature and humidity sensor is located at the air inlet.

[0012] Preferably, the PCBA is provided with a heat-resistant structure, which is used to block the heat transferred directly from the PCBA to the temperature and humidity sensor.

[0013] Preferably, the heat-resistant structure is a heat-resistant groove, which is located around the temperature and humidity sensor, and the heat-resistant groove has an open opening.

[0014] Preferably, a heat insulation structure is provided on the upper housing to reduce the impact of heat radiation on the temperature and humidity sensor.

[0015] Preferably, the heat insulation structure is a grooved baffle, which surrounds the temperature and humidity sensor.

[0016] Preferably, both the upper and lower shells are detachably connected to the frame.

[0017] Preferably, the frame further includes elastic elements, which are respectively disposed between the frame body and the lower shell and the upper shell.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0019] (1) This utility model sets up optimized airtight isolation main and secondary air ducts, uses the air in the main air duct for particulate matter detection, and uses the air in the secondary air duct to remove the heat generated by the heating element, maintains the internal temperature range of the equipment, and ensures the normal operation of the equipment.

[0020] (2) This utility model blocks the heat conduction path of the PCBA board by setting heat-insulating grooves on the PCBA, weakens or eliminates the influence of the heat-generating device on the temperature and humidity sensor, and ensures the accuracy of temperature and humidity measurement.

[0021] (3) By setting a groove baffle, this utility model forms a physical isolation barrier without increasing costs, reducing the impact of heat radiation on the temperature and humidity sensor and improving the stability of the equipment;

[0022] (4) This utility model is designed with snap-fit ​​bolt connection for the housing, which enables quick disassembly and assembly of the equipment; it is easy to install.

[0023] (5) By setting elastic elements between the frame and the lower and upper shells, this utility model can use the elastic force of the elastic elements to assist in the disassembly of the frame and the lower and upper shells, thereby improving the ease of operation for maintenance personnel. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is an exploded view of the overall structure of this utility model.

[0026] Figure 3 A schematic diagram showing the distribution of the main air duct and secondary air ducts.

[0027] Figure 4 This is a schematic diagram of the air duct structure.

[0028] Figure 5 This is a schematic diagram of the temperature and humidity sensor and the heat-insulating groove structure.

[0029] Wherein: 10-Upper shell assembly; 20-Frame; 30-Lower shell assembly; 101-Upper shell; 102-Exhaust port; 103-Groove baffle; 104-Air inlet; 201-Frame; 202-Elastic element; 203-PCBA; 204-LDO; 205-Temperature and humidity sensor; 206-Laser emitter; 207-Fan; 208-Bifurcation port; 209-Heat insulation groove; 210-Main air duct; 211-Secondary air duct; 301-Lower shell. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Definitions:

[0033] An LDO (Low Dropout Regulator) is a voltage regulator that maintains a small voltage difference between the input and output voltages and stabilizes the output voltage linearly.

[0034] PCBA stands for Printed Circuit Board Assembly, which refers to a complete circuit board after all electronic components (such as resistors, capacitors, chips, sensors, etc.) have been soldered and assembled on a PCB (blank circuit board).

[0035] Example 1:

[0036] This embodiment provides a three-in-one laser environment monitoring sensor, specifically as follows: Figures 1-4 As shown, the device includes a housing, on which a PCBA203 and a fan 207 are mounted. A temperature and humidity detection module and a particulate matter detection module are mounted on the PCBA203. Both the temperature and humidity detection module and the particulate matter detection module are existing technologies. The temperature and humidity detection module is a purchased product. The working principle of the particulate matter detection module is the same as that of our company's existing patented product (a laser air particulate matter sensor CN208399327U), so it will not be described in detail here.

[0037] The housing is provided with an air duct that connects the exhaust port 102, the air inlet 104, and the diversion port 208 on the housing. The fan 207 is installed at the exhaust port 102. The air duct includes a guide air duct, a main air duct 210, and a secondary air duct 211. One end of the guide air duct is connected to the air inlet 104, and the other end is connected to the diversion port 208. One end of the main air duct 210 and the secondary air duct 211 are both connected to the exhaust port 102, and the other end of both are connected to the diversion port 208. The main air duct 210 is used for particulate matter detection module to perform detection. The secondary air duct 211 is used to actively exhaust the heat generated by the particulate matter detection module.

[0038] The housing includes:

[0039] Upper shell assembly 10, the upper shell assembly 10 includes an upper shell 101, and the exhaust port 102 and the air inlet port 104 are disposed on the upper shell 101;

[0040] Frame 20, the frame 20 includes a frame body 201, the PCBA 203 and the fan 207 are mounted on the frame body 201; the shunt port 208 is disposed on the frame body 201;

[0041] Lower shell assembly 30, the lower shell assembly 30 including lower shell 301;

[0042] The frame 201 is provided with an air duct partition, which cooperates with the upper shell 101 and the lower shell 301 to form the air duct, the main air duct 210 and the secondary air duct 211.

[0043] When this device is in use, fan 207 is activated. At this time, fan 207 discharges the airflow in the duct from the exhaust port 102 to the housing, while negative pressure is generated at the air inlet 104 to draw in outside air. The airflow path is as follows: intake at air inlet 104 → flows through the temperature and humidity detection module at air inlet 104 → flows through the air duct to the splitter port 208 → begins to split, part flows through the main air duct 210, and part flows through the secondary air duct 211 → finally merges at fan 207 → and is discharged from exhaust port 102. During this period, the temperature and humidity detection module acquires the temperature and humidity data of the outside air; then, when flowing through the main air duct 210, the particulate matter detection module acquires the particulate matter content data of the outside air, while the airflow flowing through the secondary air duct 211 blows away the heat generated by the particulate matter detection module.

[0044] Since the main air duct 210 and the secondary air duct 211 have different cross-sectional sizes, they can be manufactured and adjusted according to the actual application scenario. The flow ratio of the main air duct 210 to the secondary air duct 211 can be selected as 9:1, 8:2, 7:3, 6:4, 5:5, etc. In this embodiment, it is preferred that about 70% of the air flows through the main air duct 210. Dust particles generate a scattered light signal related to particle size under laser irradiation, which is then converted into an electrical signal by a photosensitive element, and the particle mass concentration is obtained by an algorithm. About 30% of the air flows through the secondary air duct 211. By actively cooling the heat-generating parts in the particulate matter detection module, the operating temperature of key components is ensured to be stable.

[0045] Example 2:

[0046] This embodiment further extends the above embodiment, specifically as follows: Figure 2As shown, the temperature and humidity detection module includes a temperature and humidity sensor 205, and the particulate matter detection module includes an LDO 204, a laser emitter 206, and a photoelectric conversion unit. The temperature and humidity sensor 205, the LDO 204, the laser emitter 206, and the photoelectric conversion unit are all connected to the PCBA 203. The LDO 204 and the laser emitter 206 are located on the secondary air duct 211, and the temperature and humidity sensor 205 is located at the air inlet hole 104.

[0047] By arranging the LDO 204, the laser emitter 206, and the photoelectric conversion unit in the secondary air duct 211, the airflow can effectively carry away the heat generated during their operation, ensuring the stability of their operating temperature.

[0048] Other parts of this embodiment are the same as those of the above embodiment and will not be elaborated here.

[0049] Embodiment 3:

[0050] This embodiment is further extended based on the above embodiment, specifically as Figure 4 、 Figure 5 shown. A heat insulation structure is provided on the PCBA 203, and the heat insulation structure is used to block the heat directly transferred from the PCBA 203 to the temperature and humidity sensor 205.

[0051] Preferably, the heat insulation structure is a heat insulation groove 209. The heat insulation groove 209 is located outside the temperature and humidity sensor 205, and the heat insulation groove 209 is a "匚"-shaped non-closed notch.

[0052] Preferably, the heat insulation structure is a heat insulation groove 209. The heat insulation groove 209 is located outside the temperature and humidity sensor 205, and the heat insulation groove 209 is a "C"-shaped non-closed notch.

[0053] By providing the heat insulation groove 209, the heat conduction path on the PCBA 203 is effectively blocked, reducing the influence of heat diffusion on the temperature and humidity sensor 205. The shape of the heat insulation groove 209 can be adaptively changed according to different specifications of the temperature and humidity sensor 205 used.

[0054] Other parts of this embodiment are the same as those of the above embodiment and will not be elaborated here.

[0055] Embodiment 4:

[0056] This embodiment is further extended based on the above embodiment, specifically as Figure 2 shown. A heat insulation structure is provided on the upper housing 101, and the heat insulation structure is used to reduce the influence of heat radiation on the temperature and humidity sensor 205.

[0057] Preferably, the heat insulation structure is a grooved baffle 103, which surrounds the temperature and humidity sensor 205.

[0058] By utilizing the structural design of groove baffles 103 with different shapes, the impact of heat radiation on temperature and humidity sensor 205 is reduced, thereby improving equipment stability.

[0059] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0060] Example 5:

[0061] This embodiment further extends the above embodiment, specifically as follows: Figure 2 As shown, both the upper housing 101 and the lower housing 301 are detachably connected to the frame 201. Disassembly and assembly can be completed using clips and bolts.

[0062] Preferably, the frame 20 further includes an elastic element 202, which is respectively disposed between the frame 201 and the lower shell 301 and the upper shell 101.

[0063] By setting the elastic element 202, the upper shell assembly 10 and the lower shell assembly 30 are always subjected to a spring force away from the frame 20. When it is necessary to disassemble the upper shell assembly 10 and the lower shell assembly 30, after unscrewing the fixing screws, the upper shell 101 and the lower shell 301 will automatically separate from the frame 201 under the action of the elastic element 202, reducing the difficulty of disassembly. In this embodiment, the elastic element 202 is preferably a spring.

[0064] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0065] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A three-in-one laser environmental monitoring sensor, comprising a housing, wherein a PCBA (203) and a fan (207) are installed inside the housing, and a temperature and humidity detection module and a particulate matter detection module are installed on the PCBA (203), characterized in that: The housing is provided with an air duct that connects the exhaust port (102), the air inlet (104), and the diversion port (208) provided on the housing. The fan (207) is installed at the exhaust port (102). The air duct includes a guide air duct, a main air duct (210), and a secondary air duct (211). One end of the guide air duct is connected to the air inlet (104), and the other end is connected to the diversion port (208). One end of the main air duct (210) and the secondary air duct (211) are both connected to the exhaust port (102), and the other end is both connected to the diversion port (208). The main air duct (210) is used for the particulate matter detection module to perform detection. The secondary air duct (211) is used to actively exhaust the heat generated by the particulate matter detection module.

2. The three-in-one laser environmental monitoring sensor according to claim 1, characterized in that: The housing includes: The upper shell assembly (10) includes an upper shell (101), and the exhaust port (102) and the air inlet port (104) are disposed on the upper shell (101); A frame (20) includes a frame (201), a PCBA (203) and a fan (207) mounted on the frame (201); a shunt port (208) is disposed on the frame (201); The lower shell assembly (30) includes a lower shell (301). The frame (201) is provided with an air duct partition, which cooperates with the upper shell (101) and lower shell (301) to form the air duct, main air duct (210) and secondary air duct (211).

3. The three-in-one laser environmental monitoring sensor according to claim 2, characterized in that: The temperature and humidity detection module includes a temperature and humidity sensor (205), and the particulate matter detection module includes an LDO (204), a laser emitter (206), and a photoelectric conversion unit. The temperature and humidity sensor (205), LDO (204), laser emitter (206), and photoelectric conversion unit are all connected to the PCBA (203). The LDO (204) and laser emitter (206) are located on the secondary air duct (211), and the temperature and humidity sensor (205) is located at the air inlet (104).

4. The three-in-one laser environmental monitoring sensor according to claim 3, characterized in that: The PCBA (203) is provided with a heat-resistant structure, which is used to block the heat transferred directly from the PCBA (203) to the temperature and humidity sensor (205).

5. The three-in-one laser environmental monitoring sensor according to claim 4, characterized in that: The heat-resistant structure is a heat-resistant groove (209), which is located around the temperature and humidity sensor (205). The heat-resistant groove (209) is an open groove.

6. A three-in-one laser environmental monitoring sensor according to any one of claims 3-5, characterized in that: A heat insulation structure is provided on the upper housing (101) to reduce the impact of heat radiation on the temperature and humidity sensor (205).

7. A three-in-one laser environmental monitoring sensor according to claim 6, characterized in that: The heat insulation structure is a grooved baffle (103), which surrounds the temperature and humidity sensor (205).

8. The three-in-one laser environmental monitoring sensor according to claim 2, characterized in that: Both the upper shell (101) and the lower shell (301) can be detachably connected to the frame (201).

9. A three-in-one laser environmental monitoring sensor according to claim 8, characterized in that: The frame (20) also includes elastic elements (202), which are respectively disposed between the frame (201) and the lower shell (301) and the upper shell (101).

Images