Gas detector
By employing a high-precision sensor and a flow guide design in the gas detector, the problem of insufficient gas detection accuracy is solved, full contact between the gas and the sensor is achieved, detection accuracy is improved, and the replacement process of the sensor module is simplified.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU LOHO ELECTRONICS TECH CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-04-21
AI Technical Summary
Existing gas detectors suffer from poor sensor accuracy and the use of a common ventilation structure in the standard gas hood, which prevents the gas from making sufficient contact with the sensor, thus affecting detection accuracy.
It adopts a high-precision sensor body and uses a flow guide and flow guide ring design to guide the airflow to the sensing head to ensure smooth airflow contact with the sensor. The sensor module is protected by a stainless steel explosion-proof head.
It improves the accuracy and reliability of gas detection, simplifies the sensor module replacement process, and reduces maintenance costs.
Smart Images
Figure CN224152450U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of gas detection technology, specifically relating to a gas detector. Background Technology
[0002] The technological development of gas detectors has undergone a century of innovation, its core trajectory closely intertwined with breakthroughs in sensor technology. Late 19th-century chemical detection methods, using color changes in test strips or absorption in solutions for qualitative gas analysis, while cumbersome, laid the foundation for detection. In the mid-20th century, electrochemical sensors, based on the principle of current generation through electrode reactions, achieved quantitative detection, promoting the widespread use of industrial toxic gas monitoring. Semiconductor sensors subsequently expanded the application scenarios for combustible gas and VOC detection using the resistance change mechanism of metal oxides. With the introduction of infrared spectroscopy, non-dispersive infrared (NDIR) significantly improved the detection accuracy and stability of gases such as CO2 and methane by utilizing the absorption characteristics of gas molecules at specific wavelengths of light. Catalytic combustion sensors specialize in lower explosion limit warnings for combustible gases. A gas detector is a fixed instrument capable of continuously monitoring the concentration of gases (carbon dioxide, methane, oxygen, carbon monoxide) in a working environment.
[0003] Existing gas detectors suffer from poor sensor accuracy, and the standard gas hood uses a common ventilation structure, which prevents the gas from making sufficient or timely contact with the sensor, thus affecting the actual detection effect and accuracy.
[0004] To address the aforementioned issues, this application proposes a gas detector. Utility Model Content
[0005] To address the aforementioned problems in the existing technology, this utility model provides a gas detector that improves detection accuracy.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a gas detector, including a main control module, a connector connected to the bottom of the main control module via an adapter, an explosion-proof head threadedly connected to the lower end of the adapter, a sensor module inside the explosion-proof head, a gas standard cover connected to the lower end of the adapter, a sensor body installed in the sensor module, and a sensing head at the bottom of the sensor body penetrating the explosion-proof head and located inside the gas standard cover.
[0007] As a preferred technical solution of this utility model, the adapter is threadedly connected to the connector through the threaded head at the upper end, and the adapter has a socket inside that is axially inserted into the plug.
[0008] As a preferred technical solution of this utility model, the gas hood includes a mesh cover at the lower end and a connecting sleeve fixed at the upper end of the mesh cover. The gas hood is connected to the bottom of the explosion-proof head through the connecting sleeve via threads.
[0009] As a preferred technical solution of this utility model, a first guide hood is fixed to the bottom of the inner side of the mesh cover, and a second guide hood fixed to the mesh cover is provided above the first guide hood. Both the first guide hood and the second guide hood are provided with guide rings at their upper ends.
[0010] As a preferred embodiment of this utility model, the first and second guide shields are cone-shaped with openings at both the top and bottom, and the opening at the top of the first guide shield is smaller than the opening at the top of the second guide shield.
[0011] As a preferred technical solution of this utility model, the guide ring guides the gas introduced by the conical cover upward to the sensing head.
[0012] As a preferred embodiment of this invention, the sensing head is positioned higher than the flow guide ring on the second flow guide shroud.
[0013] As a preferred embodiment of this utility model, the explosion-proof head is a stainless steel molded component.
[0014] Compared with the prior art, the beneficial effects of this utility model are: by adopting a high-precision sensor body, and then cooperating the sensing head at the bottom of the sensor body with the standard gas hood, the first and second guide hoods and the guide ring can guide the airflow in the circumferential direction of the standard gas hood to the sensing head, ensuring airflow flow and avoiding the impact of poor airflow inside the standard gas hood on detection accuracy. Attached Figure Description
[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 for Figure 1 A structural diagram viewed from below;
[0018] Figure 3 A schematic diagram of the structure in the front half-section view of the connection state of the sensing part;
[0019] Figure 4 for Figure 1 A schematic diagram of the split structure;
[0020] Figure 5 for Figure 4 A structural diagram viewed from below;
[0021] Figure 6 This is a schematic diagram of a partial cross-section of the standard air hood;
[0022] In the diagram: 1. Main control module; 11. Connector; 2. Adapter; 21. Threaded head; 22. Socket; 3. Explosion-proof head; 4. Sensor module; 41. Sensor body; 411. Sensing head; 42. Plug; 5. Standard gas cover; 51. Mesh cover; 52. Connecting sleeve; 53. First guide shield; 54. Second guide shield; 55. Guide ring. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example
[0024] Please see Figures 1-6 This utility model provides the following technical solution: a gas detector, including a main control module 1, with a connector 11 connected to the bottom of the main control module 1 via an adapter 2. An explosion-proof head 3 is threadedly connected to the lower end of the adapter 2. A sensor module 4 is housed inside the explosion-proof head 3. A gas standard cover 5 is connected to the lower end of the adapter 2. A sensor body 41 is installed in the sensor module 4. A sensing head 411 at the bottom of the sensor body 41 penetrates the explosion-proof head 3 and is located inside the gas standard cover 5. In this embodiment, the gas detector consists of a main control module and an intelligent sensor module, and can be optionally equipped with relay output, audible and visual alarm output, and can be connected to an RS485 communication port. The communication module features isolated RS485 signal output. Inserting the digital tube display module provides digital display, high / low light alarm, fault status indication, and infrared remote control functions. It features isolated RS485 signal output and standard Modbus_RTU communication protocol. It supports direct connection to Siemens PLCs or domestic and international PLCs or data acquisition modules without the need for an additional RS485 isolation module. It allows for free switching between LCD and digital tube display modules, with fast hot-swapping for plug-and-play functionality. The gas detection instrument uses standard interfaces, ensuring interchangeability between modules and simplifying sensor module replacement.
[0025] Specifically, the adapter 2 is threadedly connected to the connector 11 via the threaded head 21 at the upper end, and the adapter 2 has a socket 22 inside that is axially inserted into the plug 42.
[0026] Specifically, the gas hood 5 includes a mesh cover 51 at the lower end and a connecting sleeve 52 fixed at the upper end of the mesh cover 51. The gas hood 5 is connected to the bottom of the explosion-proof head 3 via the connecting sleeve 52.
[0027] Specifically, a first air guide 53 is fixed to the bottom inner side of the mesh cover 51, and a second air guide 54 fixed to the mesh cover 51 is provided above the first air guide 53. Both the first air guide 53 and the second air guide 54 are provided with air guide rings 55 at their upper ends. The first air guide 53 and the second air guide 54 guide the airflow at different heights to increase the sensing range.
[0028] Specifically, the first guide shroud 53 and the second guide shroud 54 are cone-shaped with openings at both the top and bottom to ensure airflow to the students. The opening at the top of the first guide shroud 53 is smaller than the opening at the top of the second guide shroud 54 to prevent the gas collected at the bottom from being blocked by the first guide shroud 53 at the top, so that the airflow is smoother inside the standard gas shroud 5 and ultimately ensures contact with 511.
[0029] Specifically, the flow guide ring 55 guides the gas introduced by the conical shroud upward to the sensor head 411. The flow guide ring 55 plays a guiding and transitioning role, guiding the horizontal airflow upward in the vertical direction through its cooperation with the conical shroud, so that the gas can fully contact the sensor head 411.
[0030] Specifically, the sensor head 411 is higher than the guide ring 55 on the second guide shroud 54. The sensor head 411 is located directly above the inner and outer sides of the upper end of the guide ring 55. Whether the air is drawn upward from the inner or outer side, it will come into contact with 511 to ensure the sensing sensitivity.
[0031] Specifically, the explosion-proof head 3 is a stainless steel molded component with reliable strength, which enhances the protection of the sensor module 4 and its internal sensor body 41 and prevents deformation.
[0032] The working principle and usage process of this utility model are as follows: The sensor body 41 is installed inside the sensor module 4, the sensing head 411 passes through the lower end of the sensor module 4, the explosion-proof head 3 is installed in the explosion-proof head 3, the sensing head 411 passes through the bottom of the explosion-proof head 3, the connecting sleeve 52 and the explosion-proof head 3 are connected by a screw to install the gas mask 5 at the lower end of the explosion-proof head 3, the explosion-proof head 3, the sensor module 4, and the gas mask 5 form an integrated detection module, the adapter 2 is fixedly installed with the main control module 1 by the screw of the threaded head 21 and the connector 11, the integrated detection module is connected to the lower end of the adapter 2 by a thread, the plug 42 is plugged into the socket 22 to complete the connection;
[0033] When the detection module is damaged, the integrated detection module can be directly removed from the detector by means of threading, and then a new integrated detection module can be replaced. Once the sensor body 41 is damaged, it is easy to replace, and the customer can find and solve the problem himself, avoiding the delay and labor costs of on-site service.
[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A gas detector, comprising a main control module (1), the bottom of the main control module (1) is connected with a connecting head (11) through an adapter (2), characterized in that: The adapter (2) is threadedly connected to an explosion-proof head (3) at its lower end. The explosion-proof head (3) is equipped with a sensor module (4) inside. The adapter (2) is connected to a gas hood (5) at its lower end. The sensor module (4) is equipped with a sensor body (41). The sensor head (411) at the bottom of the sensor body (41) passes through the explosion-proof head (3) and is located inside the gas hood (5).
2. The gas detection instrument of claim 1, wherein: The adapter (2) is threaded to the connector (11) via the threaded head (21) at the upper end. The adapter (2) has a socket (22) inside that is axially inserted into the plug (42).
3. The gas detection instrument of claim 1, wherein: The gas hood (5) includes a mesh cover (51) at the lower end and a connecting sleeve (52) fixed at the upper end of the mesh cover (51). The gas hood (5) is connected to the bottom of the explosion-proof head (3) through the connecting sleeve (52).
4. The gas detection instrument of claim 3, wherein: The bottom inner side of the mesh cover (51) is fixed with a first guide cover (53), and a second guide cover (54) fixed to the mesh cover (51) is provided above the first guide cover (53). The upper ends of the first guide cover (53) and the second guide cover (54) are both provided with guide rings (55).
5. The gas detection instrument of claim 4, wherein: The first guide shield (53) and the second guide shield (54) are cone-shaped with openings at both the top and bottom. The opening at the top of the first guide shield (53) is smaller than the opening at the top of the second guide shield (54).
6. The gas detection instrument of claim 4, wherein: The guide ring (55) guides the gas introduced by the conical shroud upward to the sensing head (411).
7. The gas detection instrument of claim 4, wherein: The sensor head (411) is higher than the flow guide ring (55) on the second flow guide (54).
8. The gas detection instrument of claim 1, wherein: The explosion-proof head (3) is a stainless steel molded component.