Dust sensor capable of detecting VOC / CO

Abstract

The utility model relates to a dust sensor capable of detecting VOC / CO. The dust sensor comprises a square shell, a substrate, a light-emitting element, a light-receiving element and a VOC / CO sensing module, the square shell comprises a front shell body and a rear shell body which are buckled front and back. The substrate is arranged between the front shell and the rear shell and is clamped by the front shell and the rear shell; an air inlet cavity, a transition cavity, a detection cavity and an air outlet cavity are formed in the square shell; the VOC / CO sensing module is arranged in the transition cavity; the light-emitting element and the light-receiving element are arranged on two sides of the detection cavity; light emitted by the light-emitting element directly faces the light-receiving element; a shielding rod is arranged in the middle; and the shielding rod directly faces light rays emitted by the light-emitting element and is arranged in the detection cavity. According to the utility model, the VOC / CO sensing module is integrated into the dust sensor, so that the same air to be detected is monitored in real time; the detection values of dust, volatile organic compounds or carbon monoxide are associated with each other, so that the actual condition of air can be reflected.

Description

Technical Field

[0001] This utility model relates to the technical field of dust sensors, and in particular to a dust sensor capable of detecting VOC / CO. Background Technology

[0002] In industrial production workshops, chemical industrial parks, warehouses, and other similar locations, dust, carbon monoxide, and volatile organic compounds (VOCs) can easily mix simultaneously in the air. When dust reaches a certain concentration, it can be inhaled into the lungs, posing a risk of pneumoconiosis. Carbon monoxide and VOCs directly impact human health. Therefore, in these locations, it is necessary to simultaneously monitor dust, carbon monoxide, and VOCs in real time to prevent excessively high concentrations from causing harm to the human body. Conventional detection methods involve separately setting up dust sensors, CO sensors, and VOC sensors to detect dust concentration, carbon monoxide concentration, and VOC concentration, respectively. Each sensor is set up independently and takes its own sample; therefore, there are still some differences in the air samples taken by each sensor. The values ​​obtained from the dust sensor, CO sensor, and VOC sensor are not strongly correlated and cannot represent the actual content of dust, carbon monoxide, or VOCs in the air. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a dust sensor capable of detecting VOC / CO.

[0004] The technical solution of this utility model is as follows: A dust sensor capable of detecting VOC / CO includes a square housing, a substrate, a light-emitting element, a light-receiving element, and a VOC / CO sensing module; the square housing includes a front housing and a rear housing that are snapped together; the substrate is disposed between the front housing and the rear housing and is clamped by the front housing and the rear housing; the substrate and the square housing are integrated; the inside of the square housing is provided with an air inlet chamber, a transition chamber, a detection chamber, and an air outlet chamber that are connected sequentially from bottom to top; a mixed gas containing dust, volatile organic compounds, or carbon monoxide enters from the air inlet chamber; the air inlet chamber and the transition chamber are disposed between the front housing and the substrate; the detection chamber and the air outlet chamber are disposed between the front housing and the rear housing; the VOC / CO sensing module is disposed on the front side of the substrate in the transition chamber to monitor volatile organic compounds or carbon monoxide in real time; the mixed gas enters the detection chamber.

[0005] Preferably, the light-emitting element and the light-receiving element are respectively arranged on both sides of the detection cavity to monitor the dust in the mixed gas in real time. Conventional light-emitting elements cannot be set directly opposite the light-receiving element because the direct light emitted by the light-emitting element can easily enter the light-receiving element and interfere with the detection results of the dust sensor. The light emitted by the light-emitting element in this invention can be set directly opposite the light-receiving element because a shielding rod extending from the rear housing to the middle is provided between the light-emitting element and the light-receiving element. This shielding rod is set in the detection cavity and is directly opposite the light emitted by the light-emitting element. It can block the direct light emitted by the light-emitting element, so that the direct light cannot reach the light-receiving element directly, but allows the scattered light to reach the light-receiving element, thus ensuring the detection accuracy of the dust sensor.

[0006] Preferably, the detection chamber and the transition chamber are connected at the top midpoint; the VOC / CO sensing module is located in the upper left corner of the transition chamber to minimize interference with the entry of the mixed gas into the detection chamber.

[0007] Furthermore, a heating element is provided at the center of the bottom of the transition cavity; the heating element is in contact with the front side of the substrate; the heating element heats the mixed gas in the transition cavity, improving the power of the mixed gas flow, and can be used in colder working environments.

[0008] Preferably, the dust sensor capable of detecting VOC / CO further includes lens A and lens B; lens A is disposed between the shielding rod and the light-emitting element; the light-emitting element is located at the focal point of lens A; lens A can convert the light generated by the light-emitting element into parallel light, which is beneficial for capturing dust in the mixed gas and improving the detection accuracy of the dust sensor; lens B is disposed between the shielding rod and the light-receiving element; the light-receiving element is located at the focal point of lens B; lens B focuses the light passing through the detection cavity onto the light-receiving element, which is beneficial for improving the detection accuracy of the dust sensor.

[0009] Preferably, the side of the shielding rod facing the light-receiving element is an arc surface; the reflected light from the light-emitting element is scattered onto this arc surface and will not be reflected back to the light-receiving element, thus eliminating stray light entering the light-receiving element; this arc surface can create a smooth flow without interfering with the airflow and can be used for stable detection.

[0010] Furthermore, a slit structure is provided between the lens and the detection cavity; the slit structure is coaxial with the axis of the light-emitting element; the stray light emitted by the light-emitting element is diffusely reflected in the slit structure, which can reduce the stray light incident on the light-receiving element.

[0011] Preferably, the VOC / CO sensing module is positioned in the lower middle of the transition chamber to avoid interfering with the flow of the mixed gas.

[0012] Preferably, the air inlet chamber is provided with an air inlet; the air outlet chamber is provided with an air outlet; both the air inlet and the air outlet are located on the front of the front housing; the mixed gas needs to be turned once when entering and leaving the dust sensor, which is beneficial for isolating external interference light.

[0013] Preferably, the air inlet chamber is connected to the bottom of the left side of the transition chamber; the air outlet chamber is connected to the top of the right side of the detection chamber; the mixed gas needs to turn once when entering and leaving the transition chamber, which is beneficial for isolating external interference light.

[0014] Preferably, an external module is provided at the bottom of the back side of the substrate; an external interface corresponding to the external module is provided on the bottom side of the rear housing; the external module is used to connect to an external power source or to transmit data.

[0015] Preferably, the front housing has a recessed block at the position corresponding to the detection chamber to guide the mixed gas and allow the mixed gas to pass through the detection chamber stably.

[0016] The beneficial effects of this utility model are as follows: The dust sensor of this utility model, capable of detecting VOC / CO, has the following advantages:

[0017] (1) This utility model integrates the VOC / CO sensing module into the dust sensor to monitor the same mixed gas in real time; the detection values ​​of dust, volatile organic compounds or carbon monoxide are correlated and can reflect the actual situation of the air; the mixed gas enters from the inlet chamber, is detected by the VOC / CO sensing module in the transition chamber, and is detected by dust in the detection chamber to ensure the accuracy of the detection; the VOC / CO sensing module can generate heat autonomously to provide power for air flow, so that the air flows through the inlet chamber, transition chamber, detection chamber and outlet chamber in sequence;

[0018] (2) The shielding rod of this utility model has an arc surface facing the light receiving element; the reflected light of the light-emitting element is scattered onto the arc surface and will not be reflected back to the light receiving element, thus eliminating stray light entering the light receiving element; the arc surface can make a smooth flow without interfering with the airflow and can be used for stable detection. Attached Figure Description

[0019] Figure 1 This is a front view of the dust sensor of this invention capable of detecting VOC / CO in Embodiment 1;

[0020] Figure 2 yes Figure 1 AA section view;

[0021] Figure 3 yes Figure 2 BB cross-sectional view;

[0022] Figure 4 yes Figure 3 CC section view;

[0023] Figure 5 This is a front view of the dust sensor of this invention capable of detecting VOC / CO in Embodiment 2;

[0024] Figure 6 yes Figure 5 DD sectional view;

[0025] Figure 7 yes Figure 6 EE sectional view;

[0026] Figure 8 yes Figure 7 FF sectional view;

[0027] Figure 9 This is a front view of the dust sensor of this invention capable of detecting VOC / CO in Embodiment 3;

[0028] Figure 10 yes Figure 9 GG cross-sectional view;

[0029] Figure 11 yes Figure 10 HH sectional view;

[0030] Figure 12 yes Figure 11 Sectional view II;

[0031] In the diagram: 11. Front housing, 111. Dust removal port, 112. Cover, 113. Recessed block, 12. Rear housing, 13. Air inlet chamber, 131. Air inlet, 14. Transition chamber, 141. Heating element, 15. Detection chamber, 16. Air outlet chamber, 161. Air outlet, 17. Shielding rod, 18. Slit structure, 2. Substrate, 21. External module, 3. Light-emitting element, 4. Light-receiving element, 5. VOC / CO sensing module, 6. Lens A, 7. Lens B. Detailed Implementation

[0032] Example 1: See Figure 1-4A dust sensor capable of detecting VOC / CO includes a square housing, a substrate 2, a light-emitting element 3, a light-receiving element 4, and a VOC / CO sensing module 5. The square housing includes a front housing 11 and a rear housing 12 that are fastened together. The substrate 2 is disposed between the front housing 11 and the rear housing 12 and is clamped by the front housing 11 and the rear housing 12. The substrate 2 is integrated with the square housing. The inside of the square housing is provided with an air inlet chamber 13, a transition chamber 14, a detection chamber 15, and an air outlet chamber 16 that are connected sequentially from bottom to top. A mixed gas containing dust, volatile organic compounds, or carbon monoxide enters from the air inlet chamber 13. The air inlet chamber 13 and the transition chamber 14 are disposed between the front housing 11 and the substrate 2. The detection chamber 15 and the air outlet chamber 16 are disposed between the front housing 11 and the rear housing 12. The VOC / CO sensing module 5 is disposed on the front side of the substrate 2 in the transition chamber 14 and performs real-time monitoring of volatile organic compounds or carbon monoxide. The mixed gas enters the detection chamber 15.

[0033] Compared with the prior art, this utility model integrates the VOC / CO sensing module 5 into the dust sensor to monitor the same mixed gas in real time; the detection values ​​of dust, volatile organic compounds or carbon monoxide are correlated and can reflect the actual air conditions; the mixed gas is first detected by the VOC / CO sensing module 5, and then dust is detected in the detection chamber 15 to ensure the accuracy of the detection; the VOC / CO sensing module 5 can generate heat autonomously to provide power for air flow, so that the air flows sequentially through the inlet chamber 13, the transition chamber 14, the detection chamber 15 and the outlet chamber 16.

[0034] The light-emitting element 3 and the light-receiving element 4 are respectively arranged on both sides of the detection cavity 15 to monitor the dust in the mixed gas in real time. Conventional light-emitting elements 3 cannot be set directly opposite to light-receiving elements 4 because the direct light from the light-emitting element 3 can easily enter the light-receiving element 4 and interfere with the detection results of the dust sensor. The light emitted by the light-emitting element 3 in this invention can be set directly opposite to the light-receiving element 4 because a shielding rod 17 extending from the rear housing 12 to the middle is provided between the light-emitting element 3 and the light-receiving element 4. The shielding rod 17 is set directly opposite to the light emitted by the light-emitting element 3 in the detection cavity 15 and can block the direct light from the light-emitting element 3 so that the direct light cannot reach the light-receiving element 4, while allowing the scattered light to reach the light-receiving element 4, thus ensuring the detection accuracy of the dust sensor.

[0035] The front of the front housing 11 is provided with a dust removal port 111, which is used to remove the dust remaining in the transition chamber 14; the dust removal port 111 is fastened with a cover 112 to seal the dust removal port 111 and ensure the smooth flow of mixed gas.

[0036] The detection chamber 15 is connected to the top midpoint of the transition chamber 14; the VOC / CO sensing module 5 is located in the upper left corner of the transition chamber 14 to minimize the impact on the mixed gas entering the detection chamber 15.

[0037] The dust sensor capable of detecting VOC / CO also includes lens A 6 and lens B 7; lens A 6 is disposed between shielding rod 17 and light-emitting element 3; light-emitting element 3 is located at the focal point of lens A 6; lens A 6 can convert the light emitted by light-emitting element 3 into parallel light, which is beneficial for capturing dust in the mixed gas and improving the detection accuracy of the dust sensor; lens B 7 is disposed between shielding rod 17 and light-receiving element 4; light-receiving element 4 is located at the focal point of lens B 7; lens B 7 focuses the light passing through detection cavity 15 onto light-receiving element 4, which is beneficial for improving the detection accuracy of the dust sensor.

[0038] The side of the shielding rod 17 facing the light receiving element 4 is an arc surface; the reflected light from the light emitting element 3 is scattered onto this arc surface and will not be reflected back to the light receiving element 4, thus eliminating stray light entering the light receiving element 4; this arc surface can create a smooth flow without interfering with the airflow and can be used for stable detection.

[0039] A slit structure 18 is also provided between the lens A 6 and the detection cavity 15; the slit structure 18 is coaxial with the axis of the light-emitting element; the stray light emitted by the light-emitting element 3 is diffusely reflected in the slit structure, which can reduce the stray light incident on the light-receiving element 4.

[0040] The air inlet chamber 13 is provided with an air inlet 131; the air outlet chamber 16 is provided with an air outlet 161; both the air inlet 131 and the air outlet 161 are located on the front of the front housing 11; the mixed gas needs to be turned once when entering and leaving the dust sensor, which is beneficial for isolating external interference light.

[0041] The intake chamber 13 is connected to the bottom of the left side of the transition chamber 14; the exhaust chamber 16 is connected to the top of the right side of the detection chamber 15; the mixed gas needs to turn once when entering and leaving the transition chamber 14, which is beneficial for isolating external interference light.

[0042] An external module 21 is provided on the bottom back of the substrate 2; an external interface corresponding to the external module 21 is provided on the bottom side of the rear housing 12; the external module 21 is used to connect to an external power source or to transmit data.

[0043] The front housing 11 is provided with a recessed block 113 at the position corresponding to the detection chamber 15 to guide the mixed gas and make the mixed gas pass through the detection chamber 15 stably.

[0044] In this embodiment, the VOC / CO module is selected as the VOC module.

[0045] The working process of this embodiment is as follows: A mixed gas containing dust, volatile organic compounds (VOCs), or carbon monoxide enters from the inlet chamber 13 and is first detected by the VOC / CO sensing module 5 in the transition chamber 14. The VOC / CO sensing module 5 monitors the VOCs or carbon monoxide in real time. The mixed gas then enters the detection chamber 15 to detect the dust content. The shielding rod 17 can block the direct light from the light-emitting element 3, preventing the direct light from reaching the light-receiving element 4, while allowing scattered light to reach the light-receiving element 4, thus ensuring the detection accuracy of the dust sensor. The mixed gas leaves the dust sensor through the outlet chamber 16.

[0046] Example 2: See Figure 5-8 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that a heating element 141 is provided at the bottom center of the transition cavity 14. The heating element 141 is in contact with the front side of the substrate 2. The heating element 141 heats the mixed gas in the transition cavity 14, improves the power of the mixed gas flow, and is applied to a colder working environment.

[0047] Example 3: See Figure 9-12 Example 3 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the VOC / CO sensing module 5 is located in the lower middle position of the transition cavity 14 to avoid interfering with the flow of the mixed gas. In this example, a CO module is used as the VOC / CO module.

[0048] The front housing 11 has a dust removal port 111 on the front, but no cover 112 is provided; the shape of the VOC / CO sensing module 5 matches the dust removal port 111; a narrow gap is left between the outer end of the VOC / CO sensing module 5 and the inner wall of the front housing 11; the VOC / CO sensing module 5 affects the flow rate of the mixed gas, and a single air inlet 131 is insufficient to meet the air intake requirements of the dust sensor; at this time, the dust removal port 111 serves as an additional air inlet 131 to make up for the difference in the requirements of the dust sensor.

Claims

1. A dust sensor capable of detecting VOC / CO, characterized in that, The device includes a square outer shell, a substrate, a light-emitting element, a light-receiving element, and a VOC / CO sensing module. The square outer shell includes a front shell and a rear shell that are fastened together. The substrate is disposed between the front shell and the rear shell and is clamped by the front shell and the rear shell. The inside of the square outer shell has an air inlet chamber, a transition chamber, a detection chamber, and an air outlet chamber that are connected sequentially from bottom to top. The air inlet chamber and the transition chamber are disposed between the front shell and the substrate. The detection chamber and the air outlet chamber are disposed between the front shell and the rear shell. The VOC / CO sensing module is disposed on the front side of the substrate in the transition chamber.

2. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: The light-emitting element and the light-receiving element are respectively arranged on both sides of the detection cavity; the light emitted by the light-emitting element is directly facing the light-receiving element; a shielding rod extending from the rear housing to the middle is provided between the light-emitting element and the light-receiving element; the shielding rod is directly facing the light emitted by the light-emitting element and is arranged inside the detection cavity.

3. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: The detection chamber is connected to the midpoint of the top of the transition chamber; the VOC / CO sensing module is located in the upper left corner of the transition chamber.

4. The dust sensor capable of detecting VOC / CO according to claim 3, characterized in that: A heating element is located at the center of the bottom of the transition cavity; the heating element is in contact with the front side of the substrate.

5. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: It also includes lens A and lens B; lens A is placed between the shielding rod and the light-emitting element; the light-emitting element is located at the focal point of lens A; lens B is placed between the shielding rod and the light-receiving element; the light-receiving element is located at the focal point of lens B.

6. The dust sensor capable of detecting VOC / CO according to claim 5, characterized in that: A slit structure is also provided between the lens A and the detection cavity; the slit structure is coaxial with the axis of the light-emitting element.

7. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: The VOC / CO sensing module is located in the lower middle part of the transition cavity.

8. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: The air intake chamber is equipped with an air inlet; the air outlet chamber is equipped with an air outlet; both the air inlet and the air outlet are located on the front of the front housing.

9. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: The air inlet chamber is connected to the bottom of the left side of the transition chamber; the air outlet chamber is connected to the top of the right side of the detection chamber.

10. The dust sensor capable of detecting VOC / CO according to claim 1, characterized in that: The front housing has a recessed block corresponding to the detection cavity.

Images