Structure of dust sensor

Abstract

The utility model relates to the technical field of air purifiers, in particular to a structure of a dust sensor, which comprises an air purifier body and a dust sensor body, the air purifier body comprises an upper shell and a lower shell, a centrifugal fan is arranged in the upper shell, an air duct is arranged in the upper shell, a lower air duct is arranged below the air duct, and the dust sensor body is arranged in the lower shell. An air quality display ring is arranged at the upper end of the upper shell, a sensor fixing bin is arranged at the side end of the upper shell, a sensor cover is arranged on one side of the sensor fixing bin, an air inlet is formed in the sensor cover, a filter screen is arranged on one side of the sensor cover, an air suction port is formed in the lower air duct, and a detection channel is formed in the dust sensor body. According to the utility model, the continuity and the stability of air flow in the detection channel of the sensor are kept, so that a non-interference and non-fluctuation detection environment is provided for the dust sensor body, and the detection accuracy and the detection stability are further remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air purifiers, and particularly relates to a structure of a dust sensor. Background Art

[0002] With the continuous improvement of people's attention to air quality, air purifiers are more and more widely used in daily life. As the most cost-effective sensing element of air purifiers, the detection accuracy and stability of infrared dust sensors directly affect the intelligent purification effect and user experience of air purifiers. However, the existing dust sensors usually have the structure that the sensor is fixed in the area close to the machine shell, and several air inlets are arranged on the machine shell near the detection channel of the sensor, so that the air around the purifier flows into the detection channel of the sensor through natural convection to realize the detection of the air quality around the purifier. This method has defects such as low detection accuracy, poor stability and inconvenient maintenance of the sensor, which affects the purification efficiency and user experience of the air purifier. Therefore, to solve the above problems, we propose a structure of a dust sensor. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] Aiming at the deficiencies of the prior art, the utility model provides a structure of a dust sensor, and solves the technical problems that the existing dust sensors usually have the structure that the sensor is fixed in the area close to the machine shell, and several air inlets are arranged on the machine shell near the detection channel of the sensor, so that the air around the purifier flows into the detection channel of the sensor through natural convection to realize the detection of the air quality around the purifier. This method has defects such as low detection accuracy, poor stability and inconvenient maintenance of the sensor, which affects the purification efficiency and user experience of the air purifier.

[0005] (2) Technical Solutions

[0006] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0007] The structure of a dust sensor includes an air purifier body and a dust sensor body. The air purifier body includes an upper housing and a lower housing. A centrifugal fan is arranged inside the upper housing. An air duct is arranged inside the upper housing. A lower air duct is arranged below the air duct. An air quality display ring is arranged at the upper end of the upper housing. A sensor fixing bin is arranged at the side end of the upper housing. A sensor cover is arranged on one side of the sensor fixing bin. An air inlet is opened on the sensor cover. A filter screen is arranged on one side of the sensor cover. An air suction port is arranged on the lower air duct. A detection channel is arranged inside the dust sensor body. The dust sensor body is arranged in the sensor fixing bin. The dust sensor body includes an infrared light-emitting diode and a photosensitive tube. A negative pressure chamber is arranged between the centrifugal fan and the air suction port. One end of the air suction port is hermetically connected to one end of the detection channel. The other end of the detection channel is communicated with one side of the filter screen.

[0008] Preferably: An air outlet grille is arranged at the upper end of the upper housing. The air quality display ring is arranged above the air outlet grille. The area of a single hole of the air inlet is larger than the area of a circle with a diameter of φ2. The cross-sectional area of the detection channel is φ8. The total air inlet area of the air inlet is larger than φ8.

[0009] Preferably: The mesh diameter of the filter screen is 10 - 20μm. The filter screen is connected and fixed to the dust sensor body through back glue. The diameter of the air suction port can be 2 - 4mm according to the actual situation. The air quality display ring can visually display the air particulate matter concentration status and display different colors according to different PM2.5 values.

[0010] (III) Beneficial effects

[0011] First, the air flow in the detection channel of the sensor of the present utility model maintains continuity and stability, thereby providing a non-interfering and non-fluctuating detection environment for the dust sensor body, and thus significantly improving the detection accuracy and stability.

[0012] Second, the present utility model effectively prevents large particles in the air from damaging the sensor by setting and installing a filter screen, and thus improves the protection performance.

[0013] Third, the present utility model has a detachable sensor cover, which is convenient for users to maintain and repair the sensor and prolongs the service life of the sensor. Description of the drawings

[0014] The above description is only an overview of the technical solution of the present utility model. In order to be able to understand the technical means of the present utility model more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present utility model and combines with the drawings to describe in detail.

[0015] Figure 1 It is a structural diagram of the lower housing of the present utility model;

[0016] Figure 2Structural diagram of the upper housing of the present utility model;

[0017] Figure 3 Structural diagram of the sensor fixing bin of the present utility model;

[0018] Figure 4 Half-sectional structural diagram of the upper housing of the present utility model;

[0019] Figure 5 Sectional structural diagram of the upper housing of the present utility model;

[0020] Figure 6 Structural diagram of the detection channel of the present utility model.

[0021] Legend: 1. Air purifier body; 11. Upper housing; 12. Lower housing; 13. Air quality display ring; 14. Air outlet grille; 15. Sensor fixing bin; 16. Centrifugal fan; 17. Air duct; 18. Lower air duct; 19. Negative pressure chamber; 2. Dust sensor body; 21. Sensor cover; 22. Air inlet; 23. Filter net; 24. Suction port; 25. Detection channel. Detailed implementation manners

[0022] By providing a structure of a dust sensor in the embodiments of the present application, the technical problem that in the existing dust sensor, the sensor is usually fixed in the area close to the machine shell, and several air inlets are arranged near the detection channel of the sensor on the machine shell, so that the air around the purifier flows into the detection channel of the sensor through natural convection to realize the detection of the air quality around the purifier. In this way, the sensor has defects such as low detection accuracy, poor stability and inconvenient maintenance, which affect the purification efficiency of the air purifier and the user experience is effectively solved.

[0023] Embodiment

[0024] According to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, the technical solution in the embodiments of the present application effectively solves the technical problem that in the existing dust sensor, the sensor is usually fixed in the area close to the machine shell, and several air inlets are arranged near the detection channel of the sensor on the machine shell, so that the air around the purifier flows into the detection channel of the sensor through natural convection to realize the detection of the air quality around the purifier. In this way, the sensor has defects such as low detection accuracy, poor stability and inconvenient maintenance, which affect the purification efficiency of the air purifier and the user experience. The general idea is as follows:

[0025] In view of the problems existing in the prior art, the utility model provides a structure of a dust sensor, which includes an air purifier body 1 and a dust sensor body 2. The air purifier body 1 includes an upper housing 11 and a lower housing 12. A centrifugal fan 16 is arranged in the upper housing 11, and an air duct 17 is arranged in the upper housing 11. A lower air duct 18 is arranged below the air duct 17. An air quality display ring 13 is arranged at the upper end of the upper housing 11. A sensor fixing bin 15 is arranged at the side end of the upper housing 11. A sensor cover 21 is arranged on one side of the sensor fixing bin 15. An air inlet 22 is opened on the sensor cover 21. A filter screen 23 is arranged on one side of the sensor cover 21. An air suction port 24 is arranged on the lower air duct 18. A detection channel 25 is arranged in the dust sensor body 2. Among them, the dust sensor body 2 is arranged in the sensor fixing bin 15. The dust sensor body 2 includes an infrared light-emitting diode and a photosensitive tube. A negative pressure chamber 19 is arranged between the centrifugal fan 16 and the air suction port 24. One end of the air suction port 24 is hermetically connected to the detection channel 25. The other end of the detection channel 25 is communicated with one side of the filter screen 23. When the centrifugal fan 16 is running, a negative pressure effect is generated in the lower air duct 18 area of the purifier 1. An air suction port 24 is arranged on this negative pressure chamber 19. This air suction port 24 is tightly and hermetically connected to one end of the detection channel 25 of the dust sensor body 2. At the other end, the detection channel 25 is directly communicated with the outside air to form an open connection. As the centrifugal impeller of the centrifugal fan 16 rotates continuously, a stable pressure difference is naturally formed at both ends of the detection channel 25, driving air to flow in from the outside of the air purifier body 1 shell in a continuous and stable unidirectional flow mode, passing through the sensor cover 21 and the air inlet 22, passing through the preliminary purification of the filter screen 23, and finally entering the sensor detection channel 25.

[0026] An air outlet grille 14 is arranged at the upper end of the upper housing 11. The air quality display ring 13 is arranged above the air outlet grille 14. The area of a single hole of the air inlet 22 is larger than the area of a circle with a diameter of φ2. The cross-sectional area of the detection channel 25 is φ8. The total air inlet area of the air inlet 22 is larger than φ8. The filter aperture of the filter screen 23 is 10 - 20μm. The filter screen 23 is connected and fixed to the dust sensor body 2 through back glue. The diameter of the air suction port 24 can be 2 - 4mm according to the actual situation. The air quality display ring 13 can intuitively display the air particulate matter concentration status and display different colors according to different PM2.5 values. With its fine mesh structure, the filter screen 23 becomes the first line of defense before air enters the detection channel 25, greatly reducing the pollution risk of large dust particles to the sensor detection element. The sensor cover 21 can be easily opened to directly access the internal filter screen 23 and the sensor detection channel 25. This user-friendly design greatly simplifies the maintenance process, and users can perform dust cleaning work by themselves to keep the sensor and the filter screen 23 clean.

[0027] Working principle:

[0028] First step, an infrared light-emitting diode and a photosensitive tube are built into the dust sensor body 2. When the light emitted by the light-emitting diode encounters dust in the detection channel, reflected light is generated. The photoelectric sensor reflects the concentration of dust in the air by detecting the intensity of the reflected light. When the centrifugal fan 16 is running, a negative pressure effect is generated in the lower air duct 18 area of the purifier 1. An air inlet 24 is provided on this negative pressure chamber 19. The air inlet 24 is tightly and hermetically connected to one end of the detection channel 25 of the dust sensor body 2. At the other end, the detection channel 25 is directly communicated with the outside air to form an open connection. As the centrifugal impeller of the centrifugal fan 16 rotates continuously, a stable pressure difference is naturally formed at both ends of the detection channel 25, driving air to flow into the air purifier body 1 from the outside of the housing in a continuous and stable unidirectional flow mode. After passing through the preliminary purification of the filter screen 23 via the sensor cover 21 and the air inlet 22, it finally enters the sensor detection channel 25. This design ensures the continuity and stability of the air flow in the sensor detection channel 25, provides a non-interfering and non-fluctuating detection environment for the dust sensor body 2, and thus significantly improves the detection accuracy and stability.

[0029] Second step, in order to further improve the protection level and detection accuracy of the sensor, the utility model innovatively adds a filter screen 23 at the air inlet end of the sensor detection channel. This design cleverly intercepts large-particle dust that may exist in the air. With its fine mesh structure, the filter screen 23 becomes the first line of defense before air enters the detection channel 25, greatly reducing the risk of contamination of the sensor detection element by large-particle dust. This mechanism not only ensures the cleanliness of the sensor detection convex lens, avoids detection errors caused by contamination, but also extends the maintenance cycle of the sensor and reduces the cost brought by frequent cleaning or replacement of the sensor.

[0030] Third step, considering the user's demand for the convenience of equipment maintenance, the utility model specially designs a detachable sensor cover 21. This design enables users to easily open the sensor cover 21 without professional tools, just by simply pressing the buckle position on the sensor, and directly access the internal filter screen 23 and the sensor detection channel 25. This user-friendly design greatly simplifies the maintenance process. Users can perform dust cleaning work by themselves to keep the sensor and the filter screen 23 clean. In addition, the detachable design also facilitates users to regularly check the working status of the dust sensor body 2, discover and solve problems in time, thus effectively extending the service life of the sensor. In summary, the design of the detachable sensor cover 21 of the utility model not only improves the user experience, but also reduces the overall maintenance cost by reducing the dependence on professional maintenance, which is a very practical innovation point in the utility model.

[0031] Finally, it should be noted that: Obviously, the above embodiments are merely examples given to clearly illustrate the present utility model, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present utility model.

Claims

1. A dust sensor structure, comprising an air purifier body (1) and a dust sensor body (2), wherein the air purifier body (1) comprises an upper shell (11) and a lower shell (12), characterized in that: A centrifugal fan (16) is arranged in the upper shell (11), an air duct (17) is arranged in the upper shell (11), a lower air duct (18) is arranged below the air duct (17), an air quality display ring (13) is arranged at the upper end of the upper shell (11), a sensor fixing chamber (15) is arranged at the side end of the upper shell (11), a sensor cover (21) is arranged on one side of the sensor fixing chamber (15), an air inlet (22) is opened on the sensor cover (21), a filter screen (23) is arranged on one side of the sensor cover (21), an air inlet (24) is arranged on the lower air duct (18), and a detection channel (25) is arranged in the dust sensor body (2); The dust sensor body (2) is arranged in a sensor fixing bin (15), the dust sensor body (2) comprises an infrared light emitting diode and a photosensitive tube, a negative pressure chamber (19) is arranged between the centrifugal fan (16) and the air intake port (24), the air intake port (24) is sealedly connected to one end of the detection channel (25), and the other end of the detection channel (25) is connected to one side of the filter screen (23).

2. The structure of a dust sensor according to claim 1, characterized in that: An air outlet grille (14) is provided at the upper end of the upper shell (11), and the air quality display ring (13) is arranged above the air outlet grille (14).

3. The structure of a dust sensor according to claim 2, characterized in that: The area of ​​a single hole of the air inlet (22) is larger than the circular area of ​​φ2.

4. The structure of a dust sensor according to claim 3, characterized in that: The cross-sectional area of ​​the detection channel (25) is φ8, and the total air intake area of ​​the air intake port (22) is greater than φ8.

5. The structure of a dust sensor according to claim 4, characterized in that: The filter screen (23) has a filter screen diameter of 10-20 μm.

6. The structure of a dust sensor according to claim 5, characterized in that: The filter screen (23) is connected and fixed to the dust sensor body (2) via adhesive.

7. The structure of a dust sensor according to claim 6, characterized in that: The diameter of the air inlet (24) can be 2-4 mm according to actual conditions.

8. The structure of a dust sensor according to claim 7, characterized in that: The air quality display ring (13) can intuitively display the concentration of air particles, and display different colors according to different PM2.5 values.

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