A gas detection device

Abstract

This application relates to the field of detection technology, and in particular to a gas detection device with high detection accuracy. A gas driving mechanism is provided inside the housing of the detection unit of the gas detection device. The cantilever of the gas driving mechanism can vibrate to accelerate the airflow, allowing the airflow to enter the housing as quickly as possible so that the detection unit can perform timely detection. Alternatively, a gas driving mechanism is provided inside the outer casing of the gas detection device, and the cantilever of the gas driving mechanism can vibrate to accelerate the airflow, allowing the airflow to enter the outer casing as quickly as possible and diffuse more rapidly into the housing of the detection unit, thereby improving detection accuracy.

Description

Technical Field

[0001] This application relates to the field of detection technology, specifically to a gas detection device. Background Technology

[0002] Air conditioning systems use environmentally friendly refrigerants, but these refrigerants are flammable compared to traditional refrigerants, posing certain safety hazards. Therefore, sensors are installed to detect the concentration of the gas to determine if there is a refrigerant leak, so that the control system can shut down and issue an alarm in time, reducing the safety hazards caused by environmentally friendly refrigerants.

[0003] A sensor structure for detecting the concentration of gaseous refrigerant exists in related technologies. This sensor structure includes a housing and a light receiver and a light emitter located inside the housing. The light emitter emits light, and the light receiver receives light, forming an optical path between them. If the gas entering the housing contains refrigerant, the refrigerant will absorb the corresponding wavelength in the optical path, causing a change in the optical path within the housing, thereby detecting the presence of refrigerant in the gas. However, the speed at which the gas diffuses into the housing is often slow, resulting in insufficient accuracy of this sensor structure. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a gas detection device that can improve the accuracy of detection.

[0005] This application provides a gas detection device, including a detection unit. The detection unit includes a housing and a light receiver and a light emitter located inside the housing. The housing has a vent.

[0006] The gas detection device includes a gas driving mechanism, which includes a housing with an inlet and an outlet. At least a portion of the housing is located inside the outer shell, and the inlet and outlet are located in the portion of the housing inside the outer shell. The gas driving mechanism also includes a cantilever located inside the housing, which is capable of vibrating when electrically energized. The outlet and inlet are located on opposite sides of the cantilever in the thickness direction.

[0007] In this application, a gas driving mechanism is provided inside the housing of the detection unit of the gas detection device. The cantilever of the gas driving mechanism can vibrate to accelerate the flow of air, so that the air can enter the housing as soon as possible so that the detection unit can perform detection in a timely manner, thereby improving the accuracy of detection.

[0008] This application also provides a gas detection device, including an outer cover, a circuit board and a detection unit. The detection unit and the circuit board are both located in the inner cavity of the outer cover. The outer cover has a vent structure. The holes in the vent structure connect the space inside the outer cover and the space outside the outer cover. The detection unit and the circuit board are electrically connected.

[0009] The detection unit includes a housing and a light receiver and a light emitter located inside the housing; the housing has a vent.

[0010] The gas detection device also includes a gas driving mechanism located inside the outer casing; the gas driving mechanism includes a housing with an air inlet and an air outlet; the gas driving mechanism also includes a cantilever located inside the housing, the cantilever being capable of vibrating when energized, and the air outlet and air inlet being located on opposite sides of the cantilever in the thickness direction.

[0011] In this application, a gas driving mechanism is provided inside the outer casing of the gas detection device. The cantilever of the gas driving mechanism can vibrate to accelerate the flow of air, so that the air can enter the outer casing as quickly as possible and diffuse into the outer shell of the detection unit more quickly, so that the detection unit can perform detection in a timely manner, thereby improving the accuracy of detection. Attached Figure Description

[0012] Figure 1 This is an explosion diagram of a gas detection device in one embodiment of this application;

[0013] Figure 2 for Figure 1 A schematic diagram of the assembly structure of the circuit board and detection unit of the gas detection device;

[0014] Figure 3 for Figure 2 Enlarged schematic diagram of part A in the middle;

[0015] Figure 4 for Figure 2 A schematic diagram of the structure of the detection unit;

[0016] Figure 5 for Figure 4 A cross-sectional schematic diagram of the detection unit in the middle;

[0017] Figure 6 for Figure 5 Enlarged diagram of part B in the middle;

[0018] Figure 7 This is a schematic diagram of the detection unit of the gas detection device in another embodiment of this application;

[0019] Figure 8 for Figure 7 A schematic diagram of the detection unit from another angle;

[0020] Figure 9 for Figure 7 Cross-sectional view along the CC direction;

[0021] Figure 10 for Figure 9 Schematic diagram of cross-section along the DD direction;

[0022] Figure 11 for Figure 10 Schematic diagram of the EE section;

[0023] Figure 12 for Figure 11 The rear view in the image.

[0024] The annotations in the attached figures are explained as follows:

[0025] 100 - Gas detection device;

[0026] 10-Outer cover; 101-Upper cover; 102-Lower cover; 10a-Ventilation structure;

[0027] 20-Support frame;

[0028] 30- Waterproof and breathable membrane;

[0029] 40 - Circuit board; 401 - Pin; 40a - Mounting hole;

[0030] 50 - Detection unit;

[0031] 501-Outer shell; 5011-Fourth wall portion; 5012-First wall portion; 5012b-Perforation; 50121-Bottom wall of the groove; 5012a-Receiving portion; 5013-Side wall portion; 5013-Second wall portion; 5014-Third wall portion; 501a-Ventilation port;

[0032] 502-First electrical connector; 5021-First insertion part;

[0033] 503 - Optical Emitter;

[0034] 504 - Optical Receiver;

[0035] 505-Gas drive mechanism; 505a-First cavity; 505b-Second cavity; 5051-Mechanism housing; 50511-Top wall; 50512-Bottom wall; 5051a-Air inlet; 5051b-Air outlet; 5052-Base; 50521-First base; 50522-Second base; 5053-Cantilever; 50531-First cantilever; 50532-Second cantilever; 506-Second electrical connector; 5061-Second insertion part;

[0036] 60-hole plate. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Please refer to Figures 1 to 3 , Figure 1 This is an explosion diagram of a gas detection device 100 in one embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the assembly structure of the circuit board 40 and the detection unit 50 of the gas detection device 100; Figure 3 for Figure 2 Enlarged diagram of part A in the middle.

[0039] This embodiment provides a gas detection device 100, which includes an outer cover 10, comprising an upper cover 101 and a lower cover 102. The outer cover 10 can also have other structural forms. The gas detection device 100 also includes a circuit board 40 and a detection unit 50 located inside the outer cover 10. The detection unit 50 and the circuit board 40 are electrically connected to convert the signal detected by the detection unit 50 and transmit it to the outside. The circuit board 40 is also provided with pins 401 for external connection. In this embodiment, the gas detection device 100 is specifically used for gas detection. The outer cover 10 has a vent structure 10a, the holes of which connect the space inside the outer cover 10 to the space outside, so that gas can enter the interior of the outer cover 10 of the gas detection device 100 and be detected by the detection unit 50. In addition, the interior of the outer cover 10 is also provided with a support frame 20, a waterproof and breathable membrane 30, a perforated plate 60, etc., so that the gas is treated before flowing to the detection unit 50, thereby protecting the detection unit 50 and the circuit board 40.

[0040] like Figures 4 to 5 As shown, Figure 4 for Figure 2 The structural schematic diagram of the detection unit 50 does not show the first electrical connector 502 and the second electrical connector 506. Figure 5 for Figure 4 A cross-sectional view of the detection unit 50 is shown, specifically a cross-sectional view along the Y direction of the detection unit 50.

[0041] The detection unit 50 in this embodiment includes a housing 501 and a light receiver 504 and a light emitter 503 located inside the housing 501. The light emitter 503 includes a light source module and may also include a focusing ring that cooperates with the light source module. The light emitter 503 emits infrared light, for example, and the light receiver 504 is used to receive the light emitted by the light emitter 503. Figure 4In this design, the outer casing 501 has a cylindrical structure. The light emitter 503 and the light receiver 504 are arranged at both ends of the cylindrical structure and can be inserted into the outer casing 501 from their respective ends. The detection unit 50 also includes a first electrical connector 502 and a second electrical connector 506. The first electrical connector 502 corresponds to the light emitter 503 and is connected to the circuit board 40, allowing it to supply power to the light emitter 503 and transmit signals to the circuit board 40. The second electrical connector 506 is connected to the circuit board 40, and the light receiver 504 is connected to the second electrical connector 506 to supply power to the light receiver 504 and transmit signals to the circuit board 40. Figure 3 As shown, the first electrical connector 502 has a first insertion portion 5021, and the second electrical connector 506 has a second insertion portion 5061. The circuit board 40 has corresponding insertion holes 40a. The first insertion portion 5021 can be inserted into the corresponding insertion hole 40a on the circuit board 40 for positioning, and the second insertion portion 5061 can be inserted into the corresponding insertion hole 40a on the circuit board 40 for positioning. After positioning, the housing 501 of the detection unit 50 can be supported on the circuit board 40.

[0042] Additionally, the outer casing 501 of the detection unit 50 has a vent 501a. Gas entering the outer casing 10 from the vent structure 10a of the outer cover 10 can re-enter the outer casing 501 through the vent 501a and be detected by the detection unit 50. Specifically, this gas detection device 100 is used, for example, to detect the refrigerant in an air conditioning system. The gas detection device 100 can be installed outdoors, near the outdoor unit of the air conditioning system. If refrigerant leaks into the air outside the outdoor unit, the air mixed with refrigerant will enter the outer casing 501. The refrigerant will absorb the corresponding wavelength of the light path between the light emitter 503 and the light receiver 504, causing a change in the light path in the outer casing 501, thus detecting the presence of refrigerant in the gas. Of course, it is not limited to detecting refrigerant; any gas mixed with other components that affects the light path can be detected.

[0043] It is worth noting that the gas detection device 100 in this embodiment also includes a gas driving mechanism 505, which can be further referred to. Figure 5 and combined Figure 6 understand, Figure 6 for Figure 5 Enlarged diagram of part B in the middle.

[0044] The gas-driven mechanism 505 in this embodiment includes a mechanism housing 5051 and a cantilever portion 5053 located within the mechanism housing 5051. The cantilever portion 5053 is capable of vibrating when electrically powered. Figure 6 The diagram illustrates two cantilever sections 5053, namely the first cantilever section 50531 and the second cantilever section 50532. (See diagram for reference.) Figure 6As shown, the gas-driven mechanism 505 also includes a base 5052. A portion of the base 5052 is located inside the mechanism housing 5051 and can be defined as a first base portion 50521. A cantilever portion 5053 is connected to the first base portion 50521. Another portion of the base 5052 is located outside the mechanism housing 5051 and can be defined as a second base portion 50522. The second base portion 50522 can be connected to the circuit board 40. Specifically, the base 5052 and the circuit board 40 can be electrically connected to supply power to the cantilever portion 5053 and transmit signals. Figure 6 Both the first cantilever portion 5053 and the second cantilever portion 5053 are connected to the first base portion 50521. The first cantilever portion 5053 and the second cantilever portion 5053 can be an integral structure, with their joint supported on the base 5052. The base 5052 may include a base body and a conductive layer attached to the outer surface of the base body. The conductive layer is used for electrical connection with the cantilever portion 5053, thereby indirectly realizing the electrical connection between the cantilever portion 5053 and the circuit board 40. Of course, the electrical connection method between the cantilever portion 5053 and the circuit board 40 is not limited to this. For example, the base 5052 may have a built-in wire harness to connect the cantilever portion 5053 and the circuit board 40, etc., which will not be listed one by one.

[0045] In this embodiment, the circuit board 40 is disposed on one side of the housing 501, and the wall portion of the housing 501 corresponding to this side is the first wall portion 5012. The detection unit 50 and the circuit board 40 can be defined as being distributed along the Z-direction, where Z is... Figure 2 In the vertical direction, the circuit board 40 is located below the detection unit 50. The housing 501 has a first wall portion 5012 and a fourth wall portion 5011 disposed opposite to each other. The fourth wall portion 5011 is located above the first wall portion 5012. The housing 501 also includes a side wall portion located between the fourth wall portion 5011 and the first wall portion 5012. The side wall portion includes a second wall portion 5013 and a third wall portion 5014 disposed opposite to each other (shown in...). Figure 11 The second wall portion 5013 and the third wall portion 5014 are located on both sides of the first wall portion 5012.

[0046] The housing 5051 of the gas drive mechanism 505 has a top wall portion 50511 and a bottom wall portion 50512 disposed opposite to each other, and the top wall portion 50511 and the bottom wall portion 50512 are respectively disposed on both sides of the cantilever portion 5053 in the thickness direction. Figure 6 In this configuration, the gas-driven mechanism 505 is mounted on the side of the housing 501 near the circuit board 40, specifically on the first wall portion 5012. At this time, a portion of the inner cavity of the mechanism housing 5051 is located between the two cantilever portions 5053 and the top wall portion 50511, forming the first cavity 505a; the other portion of the inner cavity is located between the cantilever portions 5053 and the bottom wall portion 50512, forming the second cavity 505b. Figure 6From a certain perspective, the first cavity 505a and the second cavity 505b are distributed along the Z direction. The second cavity 505b is closer to the first wall portion 5012 of the outer shell 501. The first cavity 505a and the second cavity 505b are connected.

[0047] In this embodiment, the housing 5051 of the detection unit 50 is further provided with an air inlet 5051a and an air outlet 5051b. The air inlet 5051a and the air outlet 5051b need to be located on opposite sides of the thickness direction of the cantilever portion 5053. Specifically, the air inlet 5051a can be located on the top wall portion 50511 of the housing 5051, and the air outlet 5051b can be located on the bottom wall portion 50512 of the housing 5051. Of course, the reverse is also possible. In this case, the air outlet 5051b is oriented towards the first wall portion 5012. There is a gap between the bottom wall portion 50512 of the housing 5051 and the first wall portion 5012 of the outer shell 501, that is, the first wall portion 5012 cannot block the air outlet 5051b, so as to ensure that the airflow from the air outlet 5051b can flow. In detail, corresponding to the two cantilever portions 5053, the bottom wall portion 50512 of the mechanism housing 5051 is provided with at least two air outlets 5051b, and the projections of the corresponding wall portions in the thickness direction of the cantilever portions are respectively located on the first cantilever portion 50531 and the second cantilever portion 50532, while the air inlet 5051a is located on the projection of the corresponding wall portion on the base 5052. Specifically, this embodiment provides two air outlets 5051b, one opposite to the first cantilever portion 50531 and the other opposite to the second cantilever portion 50532.

[0048] In this embodiment, the energized vibration of the cantilever portion 5053 of the gas-driven mechanism 505 is driven, for example, by a piezoelectric element. The cantilever portion 5053 may include a cantilever body and a piezoelectric element (not shown in the figure). The cantilever body may include stainless steel, nickel alloy, Hastelloy, Al (e.g., aluminum alloy), and / or Ti (e.g., Ti6Al-4V titanium alloy), etc. The piezoelectric element may be a ceramic piezoelectric sheet, or other piezoelectric crystal structures. When energized, the piezoelectric element in this type of cantilever portion 5053 deforms. If a changing electric field is applied, the piezoelectric element will continuously deform in different directions, and the cantilever body connected to the piezoelectric element will continuously move in different directions, thereby generating vibration. That is, the first cantilever portion 5053 and the second cantilever portion 5053 will vibrate. Specifically... Figure 6 The two cantilever sections 5053 can extend along the thickness direction ( Figure 6 The two cantilever sections 5053 can vibrate in the same phase or out of phase, meaning that the gas drive mechanism 505 uses the inverse piezoelectric effect to achieve the vibration of the cantilever section 5053. The inverse piezoelectric effect is existing technology and will not be discussed further.

[0049] As can be seen, in this embodiment, the first cantilever portion 50531 and the second cantilever portion 50532 of the gas drive mechanism 505 can be electrically energized and vibrated, thereby creating a pressure difference between the first cavity 505a and the second cavity 505b on both sides of the thickness direction of the cantilever portion 5053. This causes the fluid to enter from the air inlet 5051a on one side of the gas drive mechanism 505 and flow out from the air outlet 5051b on the other side, thereby generating a relatively high-speed fluid.

[0050] Therefore, in this embodiment, a gas driving mechanism 505 is provided inside the housing 501 of the detection unit 50. The cantilever portion 5053 of the gas driving mechanism 505 can vibrate to accelerate the airflow, allowing the airflow to enter the housing 501 as quickly as possible so that the detection unit 50 can perform detection in a timely manner, thereby improving the accuracy of the detection. It can be seen that the gas driving mechanism 505 is equivalent to a fan structure installed inside the housing 501. However, the gas driving mechanism 505 utilizes the inverse piezoelectric effect to drive the cantilever portion 5053 to vibrate and generate high-speed airflow. Compared to a typical fan structure, the gas driving mechanism 505 is smaller in size and can be applied to the relatively small detection unit 50.

[0051] Furthermore, in order to allow the gas drive mechanism 505 to better introduce airflow into the housing 501, in the projection perpendicular to the bottom wall portion 50512, at least one vent 501a corresponds to the projection of the wall portion in the projection of the bottom wall portion 50512, specifically in... Figure 5 In the case of the outer casing 501, a vent 501a is also provided at the position corresponding to the bottom wall 50512, so that the airflow from the outlet 5051b can quickly flow out through the vent 501a, thereby facilitating airflow circulation. Alternatively, in the projection perpendicular to the direction of the bottom wall 50512, at least a portion of the projection of at least one vent 501a corresponding to the wall coincides with the projection of the outlet 5051b corresponding to the wall, that is, at least a portion of the vent 501a and the outlet 5051b are arranged opposite each other, which also facilitates airflow circulation. Figure 5 The flow path is shown.

[0052] Similarly, in the projection perpendicular to the direction of the top wall portion 50511, the projection of at least one vent 501a corresponding to the wall portion is located in the projection of the top wall portion 50511. Figure 5At least one vent 501a can be provided on the fourth wall portion 5011, or at least a portion of the projection of the wall portion corresponding to at least one vent 501a coincides with the projection of the wall portion corresponding to the air inlet 5051a, that is, at least a portion of the vent 501a and the air inlet 5051a are arranged opposite each other. This arrangement also facilitates the airflow outside the housing 501 to more easily enter the housing 501 under the action of the gas driving mechanism 505 and enter the mechanism housing 5051 through the air inlet 5051a, thereby facilitating the flow and circulation of airflow. In addition, in this embodiment, the second wall portion 5013 and the third wall portion 5014 of the housing 501 can also be provided with vents 501a, which facilitates more gas to enter the housing 501 for detection.

[0053] It should be noted that there is an optical path channel between the light receiver 504 and the light emitter 503 in the detection unit 50. The optical path channel refers to the light projection area where the light emitter 503 projects light onto the light receiver 504, and the light within this area can also be received by the light receiver 504. In this case, the gas drive mechanism 505 can be positioned to avoid the optical path channel as much as possible, that is, to reduce or avoid the gas drive mechanism 505 blocking the light emitted by the light emitter 503, thereby ensuring effective cooperation and detection between the light receiver 504 and the light emitter 503. Specifically, projection is made along the distribution direction of the light emitter 503 and the light receiver 504, that is, along the Y-axis. The projection of the gas drive mechanism 505 is located outside the projection of the light emitter 503. In this way, the gas drive mechanism 505 can minimize interference with the optical path channel between the light emitter 503 and the light receiver 504.

[0054] In detail, such as Figure 5 As shown, the gas drive mechanism 505 is mounted on the first wall portion 5012 of the housing 501. The mounting can be a fixed connection or a limiting connection. The aforementioned base 5052 passes through the first wall portion 5012 and is electrically connected to the circuit board 40, which is a type of limiting connection with the first wall portion 5012. The second base portion 50522 of the gas drive mechanism 505 passes through the first wall portion 5012 and is connected to the circuit board 40. The circuit board 40 is located on one side of the first wall portion 5012, and since the gas drive mechanism 505 is mounted on the first wall portion 5012, it is easy to connect the gas drive mechanism 505 to the circuit board 40, thereby facilitating power supply to the gas drive mechanism 505 and signal transmission. Furthermore, when the gas drive mechanism 505 is close to the circuit board 40, the cantilever portion 5053 vibrates to drive high-speed airflow, while also serving a heat dissipation function. The first wall portion 5012 where the gas drive mechanism 505 is mounted can be cooled, thus benefiting the heat dissipation of the circuit board 40.

[0055] Based on the aforementioned working principle of the gas drive mechanism 505, the distribution direction of the air inlet 5051a and air outlet 5051b of the gas drive mechanism 505 is also the vibration direction of the cantilever portion 5053. Figure 5 In the process, the vibration direction of the first cantilever portion 5053 and the second cantilever portion 5053 is vertical, i.e., along the Z-axis. The vibration direction of the cantilever portion 5053 is parallel to its thickness direction, and the thickness direction of the cantilever portion 5053 is... Figure 5 The middle refers to the Z-axis. It can be understood that the first cantilever portion 50531 and the second cantilever portion 50532, similar to fan blades, are defined to have length and width, so that... Figure 5 From a perspective of perspective, the length is the dimension along the Y direction, and the width is the dimension along the X direction. The larger the width and length of the cantilever portion 5053, the easier it is to drive more airflow during vibration, and the higher the airflow velocity is. The thickness of the cantilever portion 5053 is relatively small to facilitate vibration. In the vibration direction, there must be a gap between the mechanism housing 5051 and the cantilever portion 5053, which only needs to form the space for the first cavity 505a and the second cavity 505b. Therefore, the gas drive mechanism 505 is defined to have a height direction, a width direction, and a length direction. The height direction is the thickness direction of the cantilever portion 5053, or the direction in which the bottom wall portion 50512 and the top wall portion 50511 are distributed. The length direction of the gas drive mechanism 505 is the length direction of the cantilever portion 5053, and it is also the distribution direction of the first cantilever portion 50531 and the second cantilever portion 50532. The width direction of the gas drive mechanism 505 is the width direction of the cantilever portion 5053, and the width direction is perpendicular to the thickness direction and the length direction. It is evident that the dimensions of the gas-driven mechanism 505 in both the width and length directions are larger than its thickness dimension. This is reflected in... Figure 5 In the gas drive mechanism 505, the height dimension is the Z-axis dimension, the width dimension is the X-axis dimension, and the length dimension is the Y-axis dimension.

[0056] When the gas outlet 5051b of the gas drive mechanism 505 is positioned toward the first wall portion 5012 of the housing 501, the distance between the gas drive mechanism 505 and the first wall portion 5012 of the housing 501 is relatively small, which means that the distance between the gas drive mechanism 505 and the optical path channel can be relatively large, thus making it less likely to encroach on the area where the optical path channel is located. Figure 5 In the housing 501, the light emitter 503 and the light receiver 504 are distributed along the Y direction, and the Y direction is perpendicular to the Z direction, as shown below. Figure 5As shown, position L is defined as the lower limit of the optical path channel. The gas drive mechanism 505 can be located below position L. The gas drive mechanism 505 is arranged with its outlet 5051b facing the first wall 5012, which is equivalent to being arranged in a thinner manner between the optical path channel and the first wall 5012. This makes it easier for the optical path channel and the gas drive mechanism 505 to be misaligned in the Z direction. It can also be understood that the inlet 5051a can be set to face the first wall 5012. In this case, the outlet 5051b faces the optical path channel. Relatively speaking, the side of the inlet 5051a facing the optical path channel is more conducive to the initial entry of airflow.

[0057] Of course, the gas drive mechanism 505 is not limited to having the air outlet 5051b or the air inlet 5051a facing the first wall portion 5012.

[0058] Please continue to refer to this. Figures 7 to 12 , Figure 7 This is a schematic diagram of the structure of the detection unit 50 of the gas detection device 100 in another embodiment of this application; Figure 8 for Figure 7 A schematic diagram of the structure of the detection unit 50 from another angle; Figure 9 for Figure 7 Cross-sectional view along the CC direction; Figure 10 for Figure 9 Schematic diagram of cross-section along the DD direction; Figure 11 for Figure 10 Schematic diagram of the EE section; Figure 12 for Figure 11 The rear view in the image.

[0059] The structure of the gas detection device 100 in this embodiment is basically the same as that in the above embodiment, except that the orientation of the gas driving mechanism 505 is different. In the previous embodiment, the air inlet 5051a or air outlet 5051b of the gas driving mechanism 505 is arranged facing the first wall portion 5012 of the outer casing 501. The air inlet 5051a and air outlet 5051b are distributed along the Z direction. The cantilever portion 5053 is roughly parallel to the first wall portion 5012. From the direction from the first wall portion 5012 to the optical path channel, the gas driving mechanism 505 is relatively thin and flat. Figures 7 to 12 In the illustrated embodiment, the air inlet 5051a and air outlet 5051b of the gas drive mechanism 505 face the side wall portion of the housing 501, such as... Figure 11As shown, the sidewall portion of the outer casing 501 includes a second wall portion 5013 and a third wall portion 5014 disposed opposite to each other. The second wall portion 5013 and the third wall portion 5014 are connected to the first wall portion 5012. Specifically, the second wall portion 5013 and the third wall portion 5014 are disposed opposite to each other along the X direction. At this time, the air inlet 5051a and the air outlet 5051b of the gas drive mechanism 505 are also distributed along the X direction. This is equivalent to the gas drive mechanism 505 in the aforementioned embodiment being rotated 90° along the Y direction. The cantilever portion 503 and the first wall portion 5012 are no longer approximately parallel, but approximately perpendicular. The shaking direction of the cantilever portion 503 is adjusted from the Z direction to the X direction.

[0060] In the aforementioned embodiments, the air inlet 5051a or air outlet 5051b is distributed along the Z-direction. Although the height dimension of the gas drive mechanism 505 is relatively small, in order to minimize interference with the optical path, the distance in the Z-direction between the bottom wall portion 50512 of the mechanism housing 5051 and the first wall portion 5012 of the outer shell 501 needs to be minimized. Since the air inlet 5051a or air outlet 5051b is oriented towards the first wall portion 5012, if the gap is too small, the airflow will be affected. In this embodiment, the air inlet 5051a and air outlet 5051b of the gas drive mechanism 505 are oriented towards the second wall portion 5013 and the third wall portion 5014 of the outer shell 501. Therefore, there is no requirement to avoid the optical path between the air inlet 5051a, air outlet 5051b and the corresponding side wall portion. The distance between the air inlet 5051a and air outlet 5051b and the corresponding side wall portion can be relatively far, which is more conducive to the flow of gas.

[0061] At this time, both the second wall portion 5013 and the third wall portion 5013 can be provided with vents 501a. Thus, when the gas drive mechanism 505 is working, airflow can flow in from one vent 501a of the housing 501 and out from the other vent 501a, making the airflow faster and smoother. Figure 11 The diagram illustrates the airflow path.

[0062] In this embodiment, in order for the gas drive mechanism 505 to better introduce airflow into the housing 501, in the projection perpendicular to the direction of the bottom wall portion 50512, the projection of at least one vent 501a corresponding to the wall portion is located in the projection of the bottom wall portion 50512. Specifically... Figure 11In the case of the outer casing 501, the third wall portion 5014, corresponding to the bottom wall portion 50512, is also provided with a vent 501a, which facilitates the airflow from the outlet 5051b to flow out of the vent 501a as quickly as possible, thereby facilitating airflow circulation. Alternatively, in the projection perpendicular to the direction of the bottom wall portion 50512, at least a portion of the projection of at least one vent 501a corresponding to the wall portion coincides with the projection of the outlet 5051b corresponding to the wall portion, that is, at least a portion of the vent 501a and the outlet 5051b are arranged opposite each other, which also facilitates airflow circulation.

[0063] Similarly, in the projection perpendicular to the direction of the top wall portion 50511, the projection of at least one vent 501a corresponding to the wall portion is located in the projection of the top wall portion 50511. Figure 12 At least one vent 501a can be provided on the second wall portion 5013, or at least a portion of the projection of the wall portion corresponding to at least one vent 501a coincides with the projection of the wall portion corresponding to the air inlet 5051a, that is, at least a portion of the vent 501a and the air inlet 5051a are arranged opposite each other. This arrangement also facilitates the airflow outside the housing 501 to more easily enter the housing 501 under the action of the gas driving mechanism 505 and enter the mechanism housing 5051 through the air inlet 5051a, thereby facilitating the flow and circulation of airflow. In detail, in the direction perpendicular to the first wall portion 5012, that is, in the Z direction, the air inlet 5051a, the air outlet 5051b, and the vent 501a can be at the same height. In this embodiment, the first wall portion 5012 and the fourth wall portion 5011 of the housing 501 may not be provided with vents 501a. Of course, the gas entering through the vent 501a needs to enter the optical path channel in order to be detected. Without obstructing the optical path channel, the height of the inlet 5051a and outlet 5051b in the Z direction can be arranged to be close to the height of the vent 501a in the Z direction.

[0064] Let's look again. Figure 11 When the air inlet 5051a and outlet 5051b of the gas drive mechanism 505 are arranged along the X-direction to better meet the airflow requirements, that is, when the vibration direction of the cantilever portion 5053 of the drive mechanism 505 is adjusted to be approximately parallel to the first wall portion 5012, and the width direction of the gas drive mechanism 505 is the Z-direction, then the gas drive mechanism 505, compared to... Figure 5 The orientation of the light source will increase its height in the Z-axis direction, which means the distance between it and the optical path will decrease.

[0065] Therefore, in this embodiment, the first wall portion 5012 of the outer casing 501 is further provided with a receiving portion 5012a, which is specifically a groove structure in this embodiment. A portion of the mechanism housing 5051 of the gas drive mechanism 505 and a portion of the second base portion 50522 are located within the space of the receiving portion 5012a. Of course, to accommodate airflow, at least a portion of the air outlet 5051b and the air inlet 5051a are located outside the space of the receiving portion 5012a. This reduces the height of the gas drive mechanism 505 within the outer casing 501 from the first wall portion 5012, thereby increasing the distance to the optical path channel and preventing obstruction of the optical path channel.

[0066] In other words, by providing the receiving portion 5012a, the X-axis arrangement of the air inlet 5051a and the air outlet 5051b can be satisfied to facilitate smooth airflow, while avoiding obstruction of the optical path. Of course, when the air outlet 5051b is positioned facing the first wall portion 5012, the receiving portion 5012a can also be provided to increase the distance between the gas driving mechanism 505 and the optical path. However, since the gas driving mechanism 505 is already positioned in a relatively thin manner between the optical path and the first wall portion 5012 when the air outlet 5051b faces the first wall portion 5012, it is easy to meet the requirement of not obstructing the optical path, so the receiving portion 5012a can be omitted, which can also reduce the processing difficulty of the first housing 501.

[0067] In addition, such as Figure 8 , 11 As shown, when the receiving portion 5012a is a groove structure, the bottom wall 50121 of the groove structure is provided with a through hole 5012b, and a portion of the second base portion 50522 passes through the through hole 5012b to connect with the circuit board 40. That is, only a portion of the second base portion 50522 protrudes from the bottom wall 50121 of the groove. Alternatively, the receiving portion 5012a can also be a through hole structure that penetrates along the thickness direction of the first wall portion 5012. In this case, the second base portion 50522 and the mechanism housing 5051 can directly face the circuit board 40. In comparison, this processing method is more convenient. However, since the receiving portion 5012a is set as a groove structure, the sealing performance of the mechanism housing 5051 is better, minimizing interference from other factors with optical path detection, and also facilitating airflow within the first housing 501, which is convenient for detection.

[0068] Specifically, the receiving portion 5012a can extend through at least one end of the first wall portion 5012 along the Y direction, so that the gas driving mechanism 505 can slide directly into the receiving portion 5012a along the Y direction, making installation relatively simple. The detection unit 50 can also be equipped with a positioning component for positioning the gas driving mechanism 505, such as being connected to the housing 501 by fasteners or engaging with it, etc., which will not be listed in detail. Of course, the receiving portion 5012a can also be a groove structure with all four sidewalls closed.

[0069] like Figure 12 As shown, the housing 501 has a first centerline N extending along the Y direction. The light receiver 504 and the light emitter 503 are centrally located and have a second centerline P extending along the Y direction. The second centerline P and the first centerline N are staggered. Of the two, the first centerline N is closer to the gas-driven structure 505. Figure 12 The second centerline P is located above the first centerline N, and the gas drive mechanism 505 is located below the first centerline N, that is, the light receiver 504 and the light transmitter 503 are positioned slightly above each other and closer to the fourth wall portion 5011, so as to maximize the distance between the optical path channel and the gas drive mechanism 505 in the Z direction and avoid the gas drive mechanism 505 blocking the optical path channel.

[0070] In this embodiment, the wall portions corresponding to the housing 5051 of the gas drive mechanism 505 and the receiving portion 5012a of the outer shell 501 may have a gap. This facilitates the installation of the gas drive mechanism 505 into the receiving portion 5012a, reducing assembly size requirements, and also promotes airflow.

[0071] In the above embodiment, the first wall portion 5012 for mounting the gas drive mechanism 505 is the side wall portion close to the circuit board 40 (i.e., Figure 5 As can be seen from the bottom wall of the outer casing 501, the gas drive mechanism 505 can also be located in other positions of the outer casing 501. As long as the air inlet 5051a and air outlet 5051b of the gas drive mechanism 505 are located inside the outer casing 501, the airflow can be accelerated, thereby improving the accuracy and timeliness of the detection unit 50.

[0072] Of course, a preferred solution is to set the first wall portion 5012 as a side wall portion near the circuit board 40, which facilitates the connection between the gas driving mechanism 505 and the circuit board 40 near the first wall portion 5012, and also helps to avoid obstructing the optical path. However, there are obviously other alternative solutions. For example, the gas driving mechanism 505 can also be set on the fourth wall portion 5011 of the housing 501. A power supply, circuit board, or electrical connector can be set outside the fourth wall portion 5011 to be electrically connected to the gas driving mechanism 505. In this case, the light receiver 504 and the light emitter 503 can also be set downwards. The gas driving mechanism 505 can also be set on the side wall portion of the housing 501. In addition, since the vent 501a in this embodiment is set on the side wall portion, it can be seen that it can also be set in other positions, such as the fourth wall portion 5011 of the housing 501.

[0073] In the above embodiment, the first wall portion 5012 is a wall portion close to the circuit board 40, which facilitates the electrical connection of the gas drive mechanism 505. At this time, due to the limitation of the circuit board 40, the gas drive mechanism 505, except for the position connected to the circuit board 40, needs to be located inside the housing 501. However, when the gas drive mechanism 505 is set in a wall portion in another position, it is not actually limited by the circuit board 40. The setting of the gas drive mechanism 505 can be more flexible. For example, a part of the mechanism housing 5051 can be located outside the housing 501, as long as at least a part of the mechanism housing 5051 is located inside the housing 501, and the air inlet 5051a and the air outlet 5051b are set in the part of the mechanism housing 5051 located inside the housing 501. That is, as long as the air inlet 5051a and the air outlet 5051b are located inside the housing 501, it is easier to avoid the obstruction of the optical path.

[0074] Furthermore, the outer shell 501 and the mechanism housing 5051 mentioned in the above embodiments are generally cuboid shell structures. The cuboid outer shell 501 has a relatively straight first wall portion 5012 to facilitate assembly and connection with the circuit board 40. The cuboid shape of the mechanism housing 5051 helps to reduce space occupation. It can be understood that the outer shell 501 and the mechanism housing 5051 are not limited to cuboids and can also be other shapes. In this case, the first wall portion 5012 for mounting the gas drive mechanism 505 is part of the wall portion of the outer shell 501, but it is not required to have a clear physical boundary. For example, the outer shell 501 can be a cylindrical structure.

[0075] Furthermore, since the gas driving mechanism 505 in the above embodiment is disposed within the inner cavity of the outer shell 501 of the detection unit 50, it can be understood that the gas driving mechanism 505 can also be disposed outside the detection unit 50, located within the inner cavity of the outer cover 10. In this way, the cantilever portion 5053 of the gas driving mechanism 505 can also vibrate to accelerate the airflow, allowing the airflow to enter the outer cover 10 as quickly as possible and diffuse more rapidly into the outer shell 501 of the detection unit 50. This also facilitates timely detection by the detection unit 50, thereby improving detection accuracy. In this case, the gas driving mechanism 505 can also be disposed as close as possible to the vent structure 10a to introduce as much airflow as possible from outside the outer cover 10 into the outer cover 10.

[0076] The above are merely specific embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A gas detection device, characterized in that, The device includes a detection unit (50), which includes a housing (501) and a light receiver (504) and a light emitter (503) located within the housing (501). The housing (501) has a vent (501a). The gas detection device (100) includes a gas driving mechanism (505), which includes a housing (5051) having an inlet (5051a) and an outlet (5051b). At least a portion of the housing (5051) is located inside the outer shell (501), and the inlet (5051a) and outlet (5051b) are disposed in the portion of the housing (5051) located inside the outer shell (50). The gas driving mechanism (505) also includes a cantilever (5053) located inside the housing (5051), which is capable of vibrating when energized. The outlet (5051b) and the inlet (5051a) are located on opposite sides of the thickness of the cantilever (5053).

2. The gas detection device according to claim 1, characterized in that, The cantilever (5053) includes a cantilever body and a piezoelectric part connected to the cantilever body. The piezoelectric part is electrically connected to the circuit board (40). The gas drive mechanism (505) includes a base (5052). The base (5052) is at least partially located within the mechanism housing (5051). The cantilever (5053) is connected to a portion of the base (5052) located within the mechanism housing (5051). A portion of the cantilever (5053) is suspended from the base (5052) within the mechanism housing (5051).

3. The gas detection device according to claim 2, characterized in that, The cantilever portion (5053) includes a first cantilever portion (50531) and a second cantilever portion (50532). The first cantilever portion (50531) and the second cantilever portion (50532) are suspended from the base (5032) in opposite directions. The number of air outlets (5051b) is at least two. The projection of the at least two air outlets (5051b) onto the wall portion is located on the first cantilever portion (50531) and the second cantilever portion (50532), respectively. The projection of the air inlet (5051a) onto the wall portion is located on the projection of the base (5052).

4. The gas detection device according to any one of claims 1 to 3, characterized in that, The housing (5051) of the mechanism includes a top wall (50511) and a bottom wall (50512), the top wall (50511) and the bottom wall (50512) being located on both sides of the thickness direction of the cantilever (5053), and the air outlet (5051b) being located on the bottom wall (50512). In the projection perpendicular to the direction of the bottom wall portion (50512), the projection of at least one of the vents (501a) corresponding to the wall portion is located in the projection of the bottom wall portion (50512), or at least a portion of the projection of at least one of the vents (501a) corresponding to the wall portion coincides with the projection of the vent (5051b) corresponding to the wall portion.

5. The gas detection device according to any one of claims 1 to 4, characterized in that, The housing (5051) includes a top wall (50511) and a bottom wall (50512), the top wall (50511) and the bottom wall (50512) being located on opposite sides of the thickness direction of the cantilever (5053), and the air inlet (5051a) being located on the top wall (50511). In the projection perpendicular to the direction of the top wall portion (50511), the projection of at least one of the vents (501a) corresponding to the wall portion is located in the projection of the top wall portion (50511), or at least a portion of the projection of at least one of the vents (501a) corresponding to the wall portion coincides with the projection of the air inlet (5051a) corresponding to the wall portion.

6. The gas detection device according to any one of claims 1 to 5, characterized in that, The projection is made along the distribution direction of the light emitter (503) and the light receiver (504), and at least a portion of the projection of the gas drive mechanism (505) is located outside the projection of the light emitter (503).

7. The gas detection device according to claim 6, characterized in that, The housing (501) has a first wall portion (5012), and the gas drive mechanism (505) is mounted on the first wall portion (5012). Of the gas drive mechanism (505), one of the air outlet (5051b) and the air inlet (5051a) faces the first wall portion (5012), and the other faces the optical path channel; or, the housing (501) has a second wall portion (5013) and a third wall portion (5014) located on both sides of the first wall portion (5012), and of the air inlet (5051a) and the air outlet (5051b), one faces the second wall portion (5013), and the other faces the third wall portion (5014).

8. The gas detection device according to claim 7, characterized in that, The first wall portion (5012) is provided with a receiving portion (5012a), a portion of the mechanism housing (5051) is located in the space of the receiving portion (5012a), and at least a portion of the air outlet (5051b) and the air inlet (5051a) are located outside the space of the receiving portion (5012a).

9. The gas detection device according to claim 8, characterized in that, The gas detection device (100) further includes a circuit board (40), which is located on one side of the housing (501). The wall portion of the housing (501) corresponding to one side of the circuit board (40) is the first wall portion (5012). The gas driving mechanism (505) further includes a base (5052), a portion of which passes through the first wall portion (5012) to be electrically connected to the circuit board (40), and a portion of which is located inside the mechanism housing (5051) to be electrically connected to the cantilever portion (5053). There is an optical path channel between the light emitter (503) and the light receiver (504). The receiving part (5012a) is a groove structure. The groove of the groove structure is recessed in a direction away from the optical path channel. The bottom wall (50121) of the groove structure is provided with a through hole (5012b). A part of the base (5052) passes through the through hole (5012b) to connect with the circuit board (40); or, the receiving part (5012a) is a through hole structure that penetrates along the thickness direction of the first wall (5012).

10. The gas detection device according to claim 6, characterized in that, The light receiver (504) and the light emitter (503) are distributed along the Y direction and are centered. The housing (501) has a first center line (N) extending along the Y direction, and the light receiver (504) and the light emitter (503) have a second center line (P) extending along the Y direction. Of the second center line (P) and the first center line (N), the first center line (N) is closer to the gas-driven structure (505).

11. The sensing device according to any one of claims 6 to 10, characterized in that, Both the second wall portion (5013) and the third wall portion (5014) are provided with the vent (501a).

12. The gas detection device according to claims 1 to 3, characterized in that, The gas detection device (100) also includes a circuit board (40), which is located on one side of the housing (501), and the wall portion of the housing (501) corresponding to the side of the circuit board (40) is a first wall portion (5012). The gas drive mechanism (505) further includes a base (5052), a portion of which passes through the first wall portion (5012) to be electrically connected to the circuit board (40), and a portion of which is located inside the mechanism housing (5051) to be electrically connected to the cantilever portion (5053).

13. A gas detection device, characterized in that, The device includes an outer cover (10), a circuit board (40), and a detection unit (50). The detection unit (50) and the circuit board (40) are both located inside the outer cover (10). The outer cover (10) has a vent structure (10a). The vent structure (10a) has holes that connect the space inside the outer cover (10) to the space outside. The detection unit (50) and the circuit board (40) are electrically connected. The detection unit (50) includes a housing (501) and a light receiver (504) and a light emitter (503) located inside the housing (501). The housing (501) has a vent (501a). The gas detection device (100) further includes a gas driving mechanism (505), which is located inside the outer cover (10). The gas driving mechanism (505) includes a mechanism housing (5051), which has an air inlet (5051a) and an air outlet (5051b). The gas driving mechanism (505) also includes a cantilever portion (5053) located inside the mechanism housing (5051), which is capable of vibrating when energized. The air outlet (5051b) and the air inlet (5051a) are located on opposite sides of the thickness direction of the cantilever portion (5053).

14. The gas detection device according to claim 13, characterized in that, The cantilever (5053) includes a cantilever body and a piezoelectric part connected to the cantilever body. The piezoelectric part is electrically connected to the circuit board (40). The gas drive mechanism (505) includes a base (5052). The base (5052) is at least partially located within the mechanism housing (5051). The cantilever (5053) is connected to a portion of the base (5052) located within the mechanism housing (5051). A portion of the cantilever (5053) is suspended from the base (5052) within the mechanism housing (5051).

15. The gas detection device according to claim 14, characterized in that, The cantilever portion (5053) includes a first cantilever portion (50531) and a second cantilever portion (50532). The first cantilever portion (50531) and the second cantilever portion (50532) are suspended from the base (5032) in opposite directions. The number of air outlets (5051b) is at least two. The projection of the at least two air outlets (5051b) onto the wall portion is located on the first cantilever portion (50531) and the second cantilever portion (50532), respectively. The projection of the air inlet (5051a) onto the wall portion is located on the projection of the base (5052).

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