A protective device for a gas detector
By designing protective devices such as transparent covers, louver blades, and drainage holes, the problem of gas detectors being easily contaminated in dust, mud, and liquid environments has been solved, achieving effective protection and normal operation of the detectors, and improving rescue efficiency and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 莫丽平
- Filing Date
- 2025-08-11
- Publication Date
- 2026-06-30
AI Technical Summary
Existing gas detectors are easily contaminated in dusty, muddy, and liquid rescue environments, leading to decreased detection accuracy and reduced equipment reliability, which affects rescue efficiency and safety.
A protective device consisting of a top cover, a partition shelf, and a hemisphere was designed. It uses a transparent cover plate, louver blades, and drainage hole structure, combined with a hemispherical design and foot supports, to prevent mud, water, and dust from directly contacting the gas detector and maintain its normal operation.
It effectively protects the gas detector from contamination by dust, mud, and water, ensuring detection accuracy and equipment reliability, and improving safety and efficiency during rescue operations.
Smart Images
Figure CN224439388U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of downhole rescue equipment technology, specifically a protective device for a gas detector. Background Technology
[0002] In the field of vertical shaft rescue, the mainstream gas detection technologies currently include traditional manual sampling and diversified detection systems, which mainly include four categories: portable detection equipment, remote sampling systems, bundled tube monitoring systems, and throwable wireless devices. Each of these has its own characteristics in terms of detection principle, structural design, and applicable scenarios.
[0003] 1. Portable multi-parameter gas detector
[0004] Portable gas detectors are essential equipment carried by underground rescue personnel, featuring multi-sensor integration as their core characteristic. A typical example is the CD4(A) multi-parameter gas detector, which employs a modular design: the outer shell is equipped with an explosion-proof silicone protective sleeve to enhance impact resistance (IP54 protection level), and internally integrates an electrochemical oxygen sensor, a catalytic combustion methane sensor, an infrared carbon dioxide sensor, and an electrochemical carbon monoxide sensor. The instrument operates based on specific gas reactions and has passed ExibI explosion-proof certification and coal mine safety certification (MA mark), meeting the requirements for use in underground hazardous environments.
[0005] 2. Remote sampling and gas chromatography analysis system
[0006] In high-risk areas following downhole accidents, non-contact gas sampling technology can significantly reduce the risks to rescue personnel. The PGL-2 portable gas analysis and testing equipment is an innovative solution in this field. The system consists of a ground workstation, an electric vacuum pump, a 5km reinforced polyurethane sampling tube (with reel), and a multi-component analysis module.1 The working principle is as follows: a DC vacuum pump generates negative pressure, drawing downhole gas from within a 5km radius to the surface through the sampling tube. The gas then flows through a pretreatment dehumidification and dust removal device before entering the detection unit. The detection unit employs a dual-technology fusion design—for conventional gases (… Rapid initial screening using electrochemical / infrared sensors for complex gas components (such as...) Alkenes are precisely quantified using a micro gas chromatograph (μGC), enabling basic gas analysis to be completed within 3 seconds, while chromatographic analysis takes 2-4 minutes.
[0007] 3. Throw-and-drop wireless detection device
[0008] In enclosed areas or collapsed tunnels inaccessible to personnel, the ZCJ4 environmental parameter detection device achieves breakthroughs in non-contact detection. The system consists of a spherical probe (10cm in diameter, with an explosion-proof casing) and a handheld wireless terminal. Rescuers can deliver the probe into the danger zone by throwing or launching it (maximum projection distance 100m), and the probe's built-in diffusion sensor immediately begins detection. Concentration and ambient temperature are transmitted back to the terminal host in real time via a 2.4GHz wireless mesh network. When the gas concentration exceeds the limit (e.g., CO > 24 ppm) or If the signal is insufficient, the main unit will immediately trigger a vibration alarm.
[0009] Despite significant advancements in gas detection technology, numerous technical bottlenecks and performance defects persist in practical shaft rescue applications, directly impacting rescue efficiency and personnel safety. The main defects are as follows:
[0010] 1. Defects in detection accuracy and reliability
[0011] Existing sensors exhibit reduced cross-sensitivity or failure in catastrophic environments. Field tests indicate that over 70% of gas detector malfunctions stem from explosion-proof membrane contamination—when the probe's explosion-proof membrane is covered by mud or drilling fluid, gas diffusion is obstructed, response time increases by 2-3 times, and concentration display errors reach up to 40% (if actual...). (When the value is 50ppm, only 30ppm is displayed).
[0012] 2. Environmental adaptability issues
[0013] Disaster shafts are often accompanied by extreme conditions such as high humidity (RH > 95%), dust accumulation, and water impact. The accuracy of most sensors drops sharply when humidity > 90%. Tests show that when the dust concentration > 100 mg / m³, the response delay of the catalytic element increases from 15 seconds to 60 seconds and cannot be recovered by the self-cleaning function.
[0014] The mechanical reliability of the equipment is also a concern. Although measuring instruments such as CD4(A) are equipped with silicone protective sleeves, there is still a 35% probability that the sensor will shift or the circuit board will become unsoldered after a drop from a height of 1.5m; in flood scenarios, it cannot withstand water pressure intrusion. Utility Model Content
[0015] The technical problem to be solved by this utility model is to provide a protective device for a gas detector. This device can protect the gas detector from being contaminated by dust, mud, or liquid when it is used in a rescue environment with dust, mud, or liquid, and maintain the normal operation of the detector.
[0016] The present invention solves the above-mentioned technical problems with the following technical solution:
[0017] This utility model discloses a protective device for a gas detector, comprising a top cover, a partition frame, and a hemisphere. The hemisphere is a sealed hollow hemisphere with feet at its bottom, a closed plane at its top, and a skirt at its top with multiple drainage holes close to the closed plane. The top cover is detachably connected to the hemisphere. The partition frame is placed on the closed plane of the hemisphere and is fixed between the top cover and the hemisphere by pressing down on the top cover. The partition frame has multiple buckles for fixing the gas detector, and a partition frame support foot at its bottom.
[0018] The top cover of this utility model includes a cover plate and a cylinder. The cylinder is fixed to the bottom of the cover plate, and a lifting ring is provided in the middle of the top of the cover plate. The bottom end of the cylinder is open, and multiple louver blades are provided on the side wall of the cylinder. The air inside the cylinder communicates with the outside through the gaps between the louver blades.
[0019] The cover plate described in this utility model is made of transparent material.
[0020] The cover plate of this invention is larger than the cylindrical size of the lower part of the top cover.
[0021] The cylindrical body of the top cover and the skirt of the hemispherical body are threaded together in this utility model.
[0022] The shelf described in this utility model is a grid-shaped shelf.
[0023] The fixing device for fixing the gas detector described in this utility model is a spring clip, a connecting bolt, or a strap.
[0024] This utility model has the following beneficial effects:
[0025] 1. Using this utility model device can effectively protect the gas detector and prevent it from being damaged.
[0026] 2. The present invention adopts a hemispherical hollow body design, which makes the protective device of the present invention float when it comes into contact with water; the foot support design makes the protective device of the present invention supported when it touches the ground and not easy to roll over, and at the same time, it plays a stabilizing role on the water surface and is not easy to roll over.
[0027] 3. The present invention adopts a cover plate design, which makes the protective device of the present invention like an umbrella, preventing sewage from directly entering its interior.
[0028] 4. The top cover of this utility model is equipped with louvered blades, which not only allows for ventilation but also prevents mud from splashing in. Even if mud enters the interior of the hemisphere, it can flow out through the drainage holes on the skirt, ensuring that the gas detector is not soaked in mud.
[0029] 5. In the event of a flood, the partition frame of this invention is higher than the closed plane of the hemisphere, and the top cover is designed with louver blades, which can prevent water from directly hitting the inside of the protective device. Combined with the design of the drainage hole, the gas detector can be well protected. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the overall structure of the protection device of the gas detector of this utility model.
[0031] Figure 2 yes Figure 1 A schematic diagram of the frontal structure of the middle hemisphere.
[0032] Figure 3 This is a three-dimensional schematic diagram of the hemispherical protective device of the gas detector of this utility model, with the foot support hidden in the diagram.
[0033] Figure 4 yes Figure 1 A schematic diagram of the structure of the top cover.
[0034] Figure 5 This is a front view schematic diagram of the partition frame of the protective device of the gas detector of this utility model.
[0035] Figure 6 yes Figure 5 A top-down view.
[0036] The following are marked in the diagram: 1. Lifting ring; 2. Cover plate; 3. Louver blade; 4. Connecting thread; 5. Drain hole; 6. Hemisphere; 7. Foot support; 8. Shelf; 9. Shelf support foot; 10. Spring clip; 11. Skirt; 12. Closed plane. Detailed Implementation
[0037] The technical solution of this utility model will be described in further detail below with reference to the accompanying drawings.
[0038] like Figure 1 As shown, the protective device of this gas detector is divided into three parts: a top cover, a partition frame 8, and a hemisphere 6. Figure 4 As shown, the top cover includes a cover plate 2 and a cylinder. The cylinder is fixed to the bottom of the cover plate 2, and a lifting ring 1 is located in the middle of the top of the cover plate 2. The bottom of the cylinder is open, and multiple louvered blades 3 are provided on the side wall of the cylinder. The air inside the cylinder communicates with the outside through the gaps between the louvered blades. The size of the cover plate 2 is larger than the size of the cylinder at the bottom of the top cover. The cover plate 2 is made of transparent material, allowing the well workers to judge the working status of the gas detector by the color of the emitted light.
[0039] like Figures 1-3As shown, the hemisphere 6 is a sealed hollow hemisphere with a foot support 7 at the bottom and a closed plane 12 at the top. The top of the hemisphere 6 is provided with a skirt 11 that is higher than the closed plane 12. The lower part of the skirt 11 is provided with multiple drainage holes 5 close to the closed plane 12. The skirt 11 is provided with a connecting thread 4, which forms a threaded connection with the cylinder of the top cover through the connecting thread 4.
[0040] The partition shelf 8 is a grid-like shelf with support feet 9 at its bottom. The partition shelf 8 rests on the closed plane 12 of the hemisphere 6 and is permeable to water. Spring clips 10 are provided on the sides of the partition shelf 8 for securing the gas detector. The partition shelf 8 contacts the cylindrical body of the top cover, and is secured between the top cover and the hemisphere 6 by pressing down on the top cover. Alternatively, the gas detector can be secured to the partition shelf 8 by binding or connecting bolts, without necessarily relying on the spring clips 10.
[0041] The working principle of this utility model device is as follows: When a dangerous situation occurs underground and rescue is required, first, the rope is passed through the lifting ring 1 and locked. The gas detector is then fixed to the partition frame 8 using spring clips 10. Next, the partition frame 8 is placed on the closed plane 12 of the hemisphere 6, and the top cover is fixed to the hemisphere using a threaded connection, thus completing the fixation of the partition frame 8 and the gas detector. The protective device of this utility model gas detector is then lowered through the wellhead. If the ground is encountered during the lowering process, the foot support 7 can support the protective device of this utility model gas detector, and gas detection can then begin.
[0042] When the protective device of the gas detector of this utility model comes into contact with water during placement, the protective device of the gas detector of this utility model floats on the water surface because the hemispherical body 6 is a hollow sealed structure. The presence of the foot support 7 makes it less likely to roll over, reducing the possibility of the gas detector tipping over and failing due to water ingress.
[0043] When the protective device of the gas detector of this utility model is placed and water comes out of the well wall, the louver blades 3 can isolate most of the water impact from entering the top cover, thereby avoiding the gas detector from being affected by mud and water. The small amount of mud and water that enters the top cover can flow down from the partition frame 8 to the closed plane of the hemisphere 6, and then be discharged from the inside through the drainage hole 5 set in the skirt.
[0044] When muddy water flows down from the protective device of the gas detector of this utility model, the muddy water will not directly rush into the interior of the protective device of the gas detector of this utility model due to the protection of the cover plate 2, so that the gas detector can be well protected.
[0045] When there is a lot of dust in the air, the design of the louver blades 3 makes it difficult for dust to enter the top cover, thus reducing the impact of dust on the gas detector.
Claims
1. A protective device for a gas detector, characterized in that, The device includes a top cover, a partition shelf, and a hemisphere. The hemisphere is a sealed hollow hemisphere with feet at the bottom and a closed plane at the top. The top of the hemisphere has a skirt with multiple drainage holes close to the closed plane. The top cover and the hemisphere are detachably connected. The partition shelf is placed on the closed plane of the hemisphere and can be fixed between the top cover and the hemisphere by pressing down on the top cover. The partition shelf is equipped with a fixing device for fixing the gas detector and a partition shelf support foot at the bottom.
2. The protection device for the gas detector according to claim 1, characterized in that, The top cover includes a cover plate and a cylinder. The cylinder is fixed to the bottom of the cover plate, and a lifting ring is provided in the middle of the top of the cover plate. The bottom of the cylinder is open, and multiple louver blades are provided on the side wall of the cylinder. The air inside the cylinder communicates with the outside through the gaps between the louver blades.
3. The protection device for the gas detector according to claim 2, characterized in that, The cover plate is made of transparent material.
4. The protection device for the gas detector according to claim 2, characterized in that, The size of the cover plate is larger than the size of the cylindrical part of the top cover.
5. The protection device for the gas detector according to claim 1, characterized in that, The cylindrical body of the top cover is threadedly connected to the skirt of the hemispherical body.
6. The protection device for the gas detector according to claim 1, characterized in that, The shelf is a grid-like shelf.
7. The protection device for the gas detector according to claim 1, characterized in that, The fixing device used to fix the gas detector is a spring clip, a connecting bolt, or a strap.