A gas sensor

Abstract

The utility model discloses a kind of gas sensors, it is related to gas detection technical field, mainly solve the problems of the shell thickness of existing laser gas sensor, larger volume, production process is complex, production cost is higher and circuit safety and poor heat dissipation performance. It includes rectangular reverse cavity, first control panel and second control panel. Rectangular reverse cavity top is equipped with mesh air inlet, two ends are equipped with first baffle and second baffle, and are enclosed into hollow cavity together;First control panel and second control panel are vertically installed in cavity two ends respectively, bottom is equipped with external circuit interface, and is fixed by insulating material filling. The utility model is through optimization structure design and production process, significantly reduce the sensor volume and thickness, improve circuit connection safety, heat dissipation performance and detection accuracy, reduce production cost simultaneously, with important application value and market prospect.

Description

Technical Field

[0001] This utility model belongs to the field of gas detection technology, specifically, it relates to a gas sensor. Background Technology

[0002] Gas sensors have a wide range of applications in real life, mainly used to detect gas leaks. They are used in petrochemical, mining, municipal, warehousing and logistics, scientific research and other fields.

[0003] Laser gas sensors are a type of gas sensor that primarily detects gas leaks using laser light. Existing laser sensors mainly consist of a housing, a breathable mesh, a control board, a transmitter, and a receiver. The control board has pins for external communication. Due to the transmitter-receiver structure and the length limitations of the optical path, the housing is mostly designed as a rectangular slot. The left and right ends house the laser transceiver, and the bottom has a space for a circuit board to house the control board. After the breathable mesh is attached to the surface of the rectangular slot, the control board is connected to the laser transceiver by soldering. Finally, potting is used to fix the laser transmitter and receiver to the two ends of the slot. This design requires space at the bottom for the control board, resulting in a thicker and larger sensor housing. The breathable mesh also requires adhesive in designated areas for fixation, leading to a complex structure and high production costs. Furthermore, the external communication circuitry is soldered through pins on the control board, requiring the control board and external circuit board to overlap. This design is detrimental to circuit safety and heat dissipation.

[0004] To address the aforementioned issues, there is an urgent need for a novel gas sensor structure that can simplify the manufacturing process, reduce production costs, optimize the sensor's size and thickness, improve the safety and heat dissipation performance of the circuit connection, and effectively reduce the interference of external light on the detection results, thereby improving the reliability and accuracy of the detection. Utility Model Content

[0005] The purpose of this utility model is to provide a gas sensor that mainly solves the problems of existing laser gas sensors, such as large housing thickness, large volume, complex manufacturing process, high production cost, and poor circuit safety and heat dissipation performance.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A gas sensor, characterized in that it includes a rectangular inverted cavity and a first control board and a second control board buckled at both ends of the rectangular inverted cavity; wherein, a mesh air inlet is provided at the top of the rectangular inverted cavity, and both ends of the mesh air inlet horizontally extend to form shielding walls, and support walls vertically extend downward along both sides of the mesh air inlet and the shielding walls, and a first baffle and a second baffle are respectively provided near both ends of the rectangular inverted cavity; the first baffle, the second baffle, the shielding wall and the support wall surround to form a hollow rectangular inverted cavity.

[0008] Further, in the present utility model, a transmitting device and a transmitting control circuit are provided on the first control board, and a receiving device and a receiving control circuit are provided on the second control board.

[0009] Further, in the present utility model, through holes are respectively opened at the centers of the first baffle and the second baffle, serving as a transmitting hole and a receiving hole respectively; wherein, the transmitting device passes through the transmitting hole into the rectangular inverted cavity, and the receiving device passes through the receiving hole into the rectangular inverted cavity.

[0010] Further, in the present utility model, both the first baffle and the second baffle are connected to the shielding wall and the support wall, and the connection parts thereof extend outward to form control board support platforms, and the control board support platforms are connected to the shielding wall and the support wall to form an inverted "concave" - shaped control board installation position.

[0011] Further, in the present utility model, both the first baffle and the second baffle are provided with fixing columns for externally connecting a circuit board for installation and fixation.

[0012] Further, in the present utility model, the first control board and the second control board are integrally in an inverted "convex" - shaped form, and external circuit interfaces for welding are provided at their bottoms. The two control boards are vertically installed in the control board installation positions at both ends of the rectangular inverted cavity and are fixed by potting with an insulating material.

[0013] Further, in the present utility model, the rectangular inverted cavity is injection - molded integrally.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] (1) The overall structure of the present utility model is simple. The mesh air inlet is directly made on the top of the rectangular inverted cavity, and the structure is injection - molded integrally, greatly simplifying the production process and reducing the production cost.

[0016] (2) The control board of this utility model has a circuit interface for external communication at the bottom. When used externally, the external circuit and the external circuit interface on the control board can be soldered together. Compared with traditional sensors, the independent control board is reduced, and its structure is simpler. When used externally, the external circuit board is placed at the bottom of the rectangular inverted cavity and fixed with a fixing post. The circuit boards will not overlap. The overall thickness and volume of the sensor are reduced, and there is no need to consider circuit safety and heat dissipation issues.

[0017] (3) The first control board and the second control board of this utility model are installed at both ends of the rectangular inverted cavity and fixed by potting with insulating material. After installation, the transmitting device and receiving device on the control board are connected to the rectangular inverted cavity from the center of the baffle. There is also a section of shielding wall at the top to block the external light, which prevents the interference of external light while ensuring the length of the optical path required for detection, making the detection more accurate. Attached Figure Description

[0018] Figure 1 This is a front structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0020] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the first control board in this utility model.

[0022] Figure 5 This is a schematic diagram of the overall structure of this utility model.

[0023] The names corresponding to the reference numerals in the attached figures are as follows:

[0024] 1- Rectangular inverted cavity; 2- Mesh air inlet; 3- Baffle wall; 4- Support wall; 5- First baffle; 6- Second baffle; 7- Control board support platform; 9- First control board; 10- Second control board; 11- Control board mounting position; 12- Fixing column; 13- Transmitting device; 14- Receiving device; 15- Transmitting hole; 16- Receiving hole; 17- External circuit interface. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0026] Example

[0027] like Figure 1As shown in the figure, the gas sensor of the present utility model as a whole includes a rectangular inverted cavity 1, a first control board 9, a second control board 10, and related core components. The rectangular inverted cavity 1 is integrally formed by injection molding, having high structural strength and tightness. The top of the rectangular inverted cavity 1 is provided with a mesh air inlet 2, and the mesh air inlet 2 adopts a small hole structure with dense arrangement, which not only ensures that the gas to be measured can smoothly enter the interior of the rectangular inverted cavity 1, but also effectively blocks the direct entry of external light. Both ends of the mesh air inlet 2 horizontally extend to form shielding walls 3, and the shielding walls 3 and the supporting walls 4 jointly enclose the hollow rectangular inverted cavity 1. The design of the shielding walls 3 further enhances the blocking effect on external light, thereby reducing the interference of external light on the detection result and improving the reliability and accuracy of the detection.

[0028] Near both ends of the rectangular inverted cavity 1, a first baffle 5 and a second baffle 6 are respectively provided. Both the first baffle 5 and the second baffle 6 are connected to the shielding walls 3 and the supporting walls 4, and the connection part extends outward to form a control board support platform 7. The control board support platform 7 and the shielding walls 3 and the supporting walls 4 jointly constitute an inverted "concave" - shaped control board installation position 11 for stably installing the first control board 9 and the second control board 10. The design of the control board support platform 7 ensures that the first control board 9 and the second control board 10 maintain a vertical state during the installation process, avoiding the problem of optical path deviation caused by inclined installation. The centers of the first baffle 5 and the second baffle 6 are respectively provided with a transmitting hole 15 and a receiving hole 16 for achieving precise alignment of the optical path. The design of the transmitting hole 15 and the receiving hole 16 ensures that the transmitting device 13 and the receiving device 14 can accurately pass through the through - holes and enter the interior of the rectangular inverted cavity 1 after installation, thereby realizing efficient optical path transmission.

[0029] As Figure 2 shown, the first control board 9 is arranged at one end of the rectangular inverted cavity 1, and an emitting device 13 and an emission control circuit are integrated thereon. The second control board 10 is arranged at the other end of the rectangular inverted cavity 1, and a receiving device 14 and a receiving control circuit are integrated thereon. The first control board 9 and the second control board 10 as a whole are in an inverted "convex" shape, and external circuit interfaces 17 that can be welded are provided at the bottom. The external circuit interfaces 17 are connected to the external circuit by welding, avoiding the way of overlapping the control board and the external circuit board in the traditional design, and significantly improving the safety and heat dissipation performance of the circuit connection. The first control board 9 and the second control board 10 are vertically installed in the control board installation positions 11 at both ends of the rectangular inverted cavity 1 and are fixed by potting with insulating materials. The potting process not only realizes the tightness between the control board and the rectangular inverted cavity 1, but also further enhances the overall structural stability of the sensor, solving the potential circuit safety hazard problem caused by the exposure of welding points in the traditional design.

[0030] As Figure 3As shown, the emitting device 13 on the first control board 9 passes through the emitting hole 15 into the rectangular inverted cavity 1, and the receiving device 14 on the second control board 10 passes through the receiving hole 16 into the rectangular inverted cavity 1. An optical path is formed between the emitting device 13 and the receiving device 14 to detect the characteristics of the gas inside the rectangular inverted cavity 1. When the gas to be tested enters the rectangular inverted cavity 1 through the mesh inlet 2, the laser emitted by the emitting device 13 passes through the gas and is received by the receiving device 14. The receiving device 14 converts the received optical signal into an electrical signal, processes it through the receiving control circuit, and then transmits it to the external circuit. This process enables accurate detection of the concentration or composition of the gas to be tested.

[0031] The first baffle 5 and the second baffle 6 are also equipped with fixing posts 12 for mounting and securing external circuit boards. The design of the fixing posts 12 not only enhances the overall structural stability of the sensor but also facilitates assembly with other devices. Through the fixing posts 12, the gas sensor can be securely mounted on the target device, ensuring its stability and reliability in practical applications.

[0032] like Figure 4 As shown, the first control board 9 includes a transmitting device 13, a transmitting control circuit, and an external circuit interface 17. The transmitting control circuit is responsible for controlling the operating state of the transmitting device 13, such as adjusting the power and frequency of the laser. The external circuit interface 17 is connected to an external circuit via soldering to ensure the stability and reliability of signal transmission. The second control board 10 has a similar structure to the first control board 9, including a receiving device 14, a receiving control circuit, and an external circuit interface 17. The receiving control circuit is responsible for processing the optical signal received by the receiving device 14 and transmitting the processed signal to the external circuit.

[0033] like Figure 5 As shown, the gas sensor of this invention has a compact overall structure and complete functions. The rectangular inverted cavity 1 is integrally injection molded, reducing the number of parts and assembly steps, significantly simplifying the manufacturing process and lowering production costs. The first control board 9 and the second control board 10 are vertically mounted at both ends of the rectangular inverted cavity 1, eliminating the space reserved at the bottom for the control board installation in traditional designs, thereby significantly reducing the overall volume and thickness of the sensor. This design not only optimizes the sensor's external dimensions but also enhances its flexibility in practical applications.

[0034] In practical applications, the gas sensor of this invention can be used in fields such as petrochemicals, mining, municipal engineering, warehousing and logistics, and scientific research. For example, in the petrochemical field, the gas sensor can be used to detect harmful gases leaking from pipelines. When a pipeline leaks, the gas to be tested enters the rectangular inverted cavity 1 through the mesh inlet 2. The laser emitted by the emitting device 13 passes through the gas and is received by the receiving device 14. The receiving device 14 converts the received optical signal into an electrical signal, processes it through the receiving control circuit, and transmits it to the external circuit. The external circuit determines the type and concentration of the gas based on the received signal and issues an alarm signal in a timely manner, thereby ensuring the safety of on-site personnel.

[0035] During use, the gas sensor of this invention exhibits excellent performance. First, the mesh air inlet 2 and the shielding wall 3 at the top of the rectangular inverted cavity 1 effectively block the direct entry of external light, reducing interference from external light on the detection results, thereby improving the reliability and accuracy of the detection. Second, the external circuit interface 17 at the bottom of the first control board 9 and the second control board 10 avoids the overlapping placement of the control board and external circuit board in traditional designs, significantly improving the safety of the circuit connection and heat dissipation performance. In addition, the design of the control board support platform 7 and the control board mounting position 11 ensures the stable installation of the control board, and the potting of insulating material further enhances the overall structural stability of the sensor.

[0036] In summary, this invention significantly improves the overall performance of the gas sensor by optimizing the structural design of the rectangular inverted cavity 1 and the layout of the control board. The rectangular inverted cavity 1 is integrally injection molded, reducing the number of parts and assembly steps, greatly simplifying the manufacturing process and lowering production costs. The first control board 9 and the second control board 10 are vertically mounted at both ends of the rectangular inverted cavity 1, eliminating the space reserved at the bottom for the control board in traditional designs, thus significantly reducing the overall volume and thickness of the sensor. The design of the external circuit interface 17 avoids the overlapping placement of the control board and external circuit board in traditional designs, significantly improving the safety of circuit connections and heat dissipation performance. Furthermore, the design of the mesh air inlet 2 and the shielding wall 3 effectively blocks direct entry of external light, reducing interference from external light on the detection results, thereby improving the reliability and accuracy of the detection. The gas sensor of this invention has significant application value and market prospects, and is suitable for various gas detection scenarios.

[0037] The above embodiments are merely one of the preferred embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications or refinements made to the main design concept and spirit of this utility model that are not of substantial significance, but solve the same technical problem as this utility model, should be included within the scope of protection of this utility model.

Claims

1. A gas sensor, characterized by, It includes a rectangular inverted cavity (1) and a first control board (9) and a second control board (10) buckled at both ends of the rectangular inverted cavity (1); among them, a mesh air inlet (2) is provided at the top of the rectangular inverted cavity (1), and both ends of the mesh air inlet (2) horizontally extend to form a shielding wall (3), and support walls (4) vertically extend from both sides of the mesh air inlet (2) and the shielding wall (3) to the bottom, and a first baffle (5) and a second baffle (6) are respectively provided near both ends of the rectangular inverted cavity (1); the first baffle (5), the second baffle (6), the shielding wall (3) and the support walls (4) enclose to form a hollow rectangular inverted cavity (1).

2. A gas sensor according to claim 1, characterised in that A transmitting device (13) and a transmitting control circuit are provided on the first control board (9), and a receiving device (14) and a receiving control circuit are provided on the second control board (10).

3. A gas sensor according to claim 2, characterized in that, Through holes are respectively opened at the centers of the first baffle (5) and the second baffle (6) as a transmitting hole (15) and a receiving hole (16); among them, the transmitting device (13) passes through the transmitting hole (15) into the rectangular inverted cavity (1), and the receiving device (14) passes through the receiving hole (16) into the rectangular inverted cavity (1).

4. A gas sensor according to claim 3, characterised in that The first baffle (5) and the second baffle (6) are both connected to the shielding wall (3) and the support walls (4), and a control board support platform (7) extends outward at the connection, and the control board support platform (7) is connected to the shielding wall (3) and the support walls (4) to form an inverted "concave" - shaped control board installation position (11).

5. A gas sensor according to claim 4, characterised in that The first baffle (5) and the second baffle (6) are both provided with fixing columns (12) for externally connecting a circuit board for installation and fixation.

6. A gas sensor according to claim 5, characterised in that The first control board (9) and the second control board (10) are integrally in an inverted "convex" shape, and an external circuit interface (17) for welding is provided at the bottom, and the two control boards are vertically installed in the control board installation positions (11) at both ends of the rectangular inverted cavity and are fixed by potting with an insulating material.

7. A gas sensor according to claim 6, characterised in that The rectangular inverted cavity (1) is integrally formed by injection molding.

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