A portable gas detector

Abstract

The utility model discloses a portable gas detection instrument belongs to the technical field of gas detection instrument, including each other's fixed upper shell and sealing plate, and the upper shell and sealing plate form the accommodation space between, and the PCB board is provided in the accommodation space, the outer edge of upper shell lower end surface projects and is provided with the lip plate, and the outer side of sealing plate is fixedly provided with the assembly plate, and the upper end surface of assembly plate is pasted with the lower end surface of upper shell, and the outer side of assembly plate and the lip plate form annular groove, and the outer surface of upper shell is covered and is provided with soft glue, and the bottom of soft glue extends to annular groove through the lower end surface of lip plate. The utility model forms a layer of soft glue between upper shell and sealing plate, and the one side surface that the soft glue in annular groove is pasted with assembly plate is provided with the protruding and forms the interference fit with assembly plate, realizes the water -tight between upper shell and sealing plate, and the outer surface of upper shell is covered with soft glue, realizes that soft glue is fixed with upper shell simultaneously and has increased the holding hand feeling, has realized the water -tight problem of upper shell and sealing plate.

Description

Technical Field

[0001] This utility model relates to a gas detector, and more particularly to a portable gas detector. Background Technology

[0002] A gas detector is an instrument used to detect the concentration of leaked gases. These include portable gas detectors, handheld gas detectors, stationary gas detectors, and online gas detectors. They primarily utilize gas sensors to detect the types of gases present in the environment; gas sensors are used to detect the composition and concentration of gases.

[0003] Currently, portable gas detectors generally have an IP protection rating of IP65 / 66, which is not suitable for certain harsh usage scenarios. Water ingress can cause the instrument to malfunction, endangering equipment and personal safety. Specifically, they are usually fixed by connecting the upper and lower shells together with at least four bolts. However, the precision of the mating surfaces of the upper and lower shells is difficult to guarantee, which can easily lead to liquid intrusion, endangering equipment and personal safety. Utility Model Content

[0004] The purpose of this invention is to provide a portable gas detector with the advantages of good sealing performance of the upper shell and sealing plate, which effectively solves the problem of liquid easily entering the gas detector due to the docking and fixing method of the upper and lower shells in the prior art.

[0005] This utility model adopts the following technical solution: A portable gas detector includes an upper shell and a sealing plate fixed to each other, forming an accommodating space between the upper shell and the sealing plate, and a PCB board is disposed in the accommodating space; a lip plate is provided with a protrusion on the outer edge of the lower end face of the upper shell, and an assembly plate is fixedly disposed on the outer side of the sealing plate. The upper end face of the assembly plate is in contact with the lower end face of the upper shell, and an annular groove is formed between the outer side of the assembly plate and the lip plate. The outer surface of the upper shell is covered with a soft rubber, and the bottom of the soft rubber extends around the lower end face of the lip plate into the annular groove. A protrusion is provided on the side of the soft rubber in the annular groove that is in contact with the assembly plate to form an interference fit with the assembly plate, thereby achieving a watertight connection between the upper shell and the sealing plate.

[0006] Furthermore, a lower connecting pipe is fixedly installed on the inner bottom wall of the sealing plate in the vertical direction, and an upper connecting pipe is fixedly installed on the inner top wall of the upper shell. The upper connecting pipe has an internal thread. The upper shell and the sealing plate are mated and fastened together. A fixing bolt is inserted from below the sealing plate into the lower connecting pipe and threadedly connected to the upper connecting pipe.

[0007] Furthermore, the top of the outer side of the upper shell is provided with a vertical curved surface, and the upper end of the soft rubber forms an assembly surface that mates with the vertical curved surface.

[0008] Furthermore, the inner bottom wall of the sealing plate is provided with a battery accommodating compartment, and a battery fixing cover is snapped onto the battery accommodating compartment.

[0009] Furthermore, spring sheets are fixedly installed at both ends of the battery accommodating hole on the PCB board. One end of the spring sheet is fixed to the PCB board and electrically connected to the circuit on the PCB board. The other end of the spring sheet extends into the battery accommodating compartment. When the battery is located in the battery accommodating compartment, the positive and negative terminals of the battery are respectively in contact with the corresponding spring sheets, so that the battery is electrically connected to the PCB board through the spring sheets.

[0010] Furthermore, the battery accommodating compartment includes several limiting blocks fixedly disposed on the inner bottom wall of the sealing plate, and a limiting space is formed between the limiting blocks on both sides, within which the battery is located.

[0011] Furthermore, the battery fixing cover includes a cover body, and vertical limiting blocks are fixedly installed on both sides of the lower end face of the cover body. A driving inclined surface and a horizontal surface are opened at the bottom of the outer side of the vertical limiting block. The PCB board and the sealing plate are fixedly installed by fixing bolts.

[0012] Furthermore, the spring sheet has a U-shaped structure, comprising a fixed plate and a contact sheet. The bottom end of the fixed plate and the bottom end of the contact sheet are fixedly connected to form a U-shaped structure. Each spring sheet is provided with a spring sheet disengagement mechanism from the battery. The spring sheet disengagement mechanism from the battery includes a threaded sleeve rotatably connected to the fixed plate. A threaded rod is threadedly connected to the inner side of the threaded sleeve. An action plate is fixedly provided on the inner side of the contact sheet in the vertical direction. A vertical hole is opened on the inner side of the action plate in the vertical direction. The inner end of the threaded rod passes through the vertical hole and is provided with an anchor block. A rotation limiting block is fixedly provided at the position corresponding to the threaded rod and the vertical hole. The rotation limiting block is located in the vertical hole, and the two vertical inner sidewalls of the vertical hole slide in contact with the outer side of the corresponding rotation limiting block. The vertical hole restricts the rotation of the rotation limiting block. A driving device is provided on the upper shell, which is used to drive the threaded sleeve to rotate.

[0013] Furthermore, the driving device includes a driving rod and a driving nut. A first bevel gear is fixedly provided at the bottom end of the driving rod, and a snap-fit ​​groove is provided at the top end of the driving rod. The driving nut is rotatably connected to the upper shell, and a snap-fit ​​block is fixedly provided at the bottom end of the driving nut. The driving nut is snapped into the driving rod through the cooperation of the snap-fit ​​block and the snap-fit ​​groove. A second bevel gear is fixedly provided on the outer surface of the threaded sleeve, and the second bevel gear meshes with the first bevel gear.

[0014] Furthermore, the sound amplification port includes a circular hole opened on the upper end face of the upper shell, and a tapered tube extending downward around the circumference of the circular hole. A waterproof and sound-permeable membrane is fixedly installed on the lower end face of the tapered tube, and the buzzer is located below the waterproof and sound-permeable membrane.

[0015] I. This utility model, by setting up an upper shell, a sealing plate and soft rubber, forms a layer of soft rubber between the upper shell and the sealing plate. The side of the soft rubber in the annular groove that is in contact with the assembly plate is provided with a protrusion to form an interference fit with the assembly plate, thereby achieving a watertight connection between the upper shell and the sealing plate. Moreover, the soft rubber covers the outer surface of the upper shell, which not only fixes the soft rubber to the upper shell but also increases the grip feel, thus solving the problem of watertightness between the upper shell and the sealing plate.

[0016] II. This utility model, by setting up a driving nut, threaded sleeve, threaded rod, fixing plate, contact piece, and anchor block, allows for the separation of the contact piece from the positive and negative terminals of the battery. First, the gas detector is turned on, and the display screen lights up. Then, the driving nut is rotated using a tool. The driving nut drives the driving rod to rotate, which in turn drives the threaded sleeve to rotate via a first and second bevel gear. The threaded sleeve drives the threaded rod to move outward, and the threaded rod, through the anchor block, drives the action plate to move closer to the fixing plate. This, in turn, causes the contact piece to deform and move outward. At this point, the display screen turns black, indicating that the contact piece has separated from the battery. This achieves the goal of completely disconnecting the battery from the device without removing it when the gas detector is not in use for a long time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the right-side structure of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the upper shell and the soft rubber in the separated state of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the upper connecting pipe in this utility model;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the soft rubber in this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram illustrating the assembly relationship between the upper shell and the soft rubber in this utility model;

[0023] Figure 7 This is a schematic cross-sectional view of the soft rubber structure in this utility model;

[0024] Figure 8 This is a schematic diagram of the internal three-dimensional structure of the upper shell in this utility model;

[0025] Figure 9 This is a schematic diagram of the internal structure of the upper shell in this utility model;

[0026] Figure 10This is a schematic diagram of the internal three-dimensional structure of the upper shell, soft rubber, and sealing plate in this utility model.

[0027] Figure 11 In this utility model Figure 10 Enlarged schematic diagram of the structure at point A in the diagram;

[0028] Figure 12 This is a schematic diagram of the internal structure of the upper shell, soft rubber, and sealing plate in this utility model.

[0029] Figure 13 This is a schematic diagram of the internal three-dimensional structure of the tapered tube in this utility model;

[0030] Figure 14 This is a three-dimensional structural diagram of the sensor in this utility model;

[0031] Figure 15 This is a three-dimensional structural diagram of the battery fixing cover, battery, and battery storage compartment in the separated state of this utility model;

[0032] Figure 16 This is a three-dimensional structural diagram of the battery fixing cover in this utility model;

[0033] Figure 17 This is a schematic diagram of the internal three-dimensional structure of the sealing plate in this utility model;

[0034] Figure 18 This is a schematic diagram of the internal structure of the sealing plate in this utility model;

[0035] Figure 19 This is a three-dimensional structural diagram of the sealing plate in this utility model;

[0036] Figure 20 This is a three-dimensional structural diagram of the PCB board in this utility model;

[0037] Figure 21 This is a three-dimensional structural diagram of the fixing bolt in this utility model;

[0038] Figure 22 This is a three-dimensional structural diagram of the spring sheet in this utility model;

[0039] Figure 23 This is a schematic diagram of the internal three-dimensional structure of the functional plate in this utility model.

[0040] In the diagram: 1. Top shell; 2. Sealing plate; 3. PCB board; 4. Battery housing hole; 5. Battery; 6. Sensor; 7. Buzzer; 8. Display screen; 9. Detection port; 10. Amplifier port; 11. Lip plate; 12. Assembly plate; 13. Soft rubber; 14. Protrusion; 15. Power button; 16. Lower connecting pipe; 17. Upper connecting pipe; 18. Fixing bolt; 19. Ribbon cable; 20. Ribbon cable socket; 21. Cover; 22. 23. Vertical curved surface; 24. Limiting block; 25. Vertical limiting block; 26. Driving inclined surface; 27. Horizontal surface; 28. Fixing plate; 29. ​​Contact piece; 30. Threaded sleeve; 31. Threaded rod; 32. Actuating plate; 33. Vertical hole; 34. Anchor block; 35. Rotation limiting block; 36. Driving rod; 37. Driving nut; 38. First bevel gear; 39. Second bevel gear; 40. Conical tube; 51. Waterproof and sound-permeable membrane. Detailed Implementation

[0041] Please see Figure 1-23 The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0042] The portable gas detector of this utility model includes an upper shell 1 and a sealing plate 2 fixed to each other, forming an accommodating space between the upper shell 1 and the sealing plate 2. A PCB board 3 is disposed in the accommodating space, and a battery accommodating hole 4, a sensor 6, and a buzzer 7 are disposed on the PCB board 3. The upper shell 1 is provided with a display screen 8, a detection port 9 corresponding to the sensor 6, and a sound amplification port 10 corresponding to the buzzer 7. A lip plate 11 is provided with a protrusion on the outer edge of the lower end face of the upper shell 1. An assembly plate 12 is fixedly disposed on the outer side of the sealing plate 2. The upper end face of the assembly plate 12 is attached to the lower end face of the upper shell 1. An annular groove is formed between the outer side of the assembly plate 12 and the lip plate 11. A soft rubber 13 is disposed on the outer surface of the upper shell 1, and the bottom of the soft rubber 13 wraps around the lower edge of the lip plate 11. The end face extends into the annular groove. The side of the soft rubber 13 in the annular groove that is in contact with the assembly plate 12 is provided with a protrusion 14 to form an interference fit with the assembly plate 12, so as to achieve water tightness between the upper shell 1 and the sealing plate 2. The fit between the upper shell 1 and the soft rubber 13 is a TPE overmolding process, which is to overmold the TPE soft rubber 13 material onto other materials. Because TPE material has good anti-slip properties and good elasticity, it can improve the touch feel of the product and enhance the grip. There are true overmolding and false overmolding. In this application, it is false overmolding. False overmolding hardly involves the compatibility of the two materials. The overmolding of the material is achieved by mechanical force, through the design of the mold and the product and the surface treatment, through the clamping action, so that the soft rubber 13 and the hard rubber (equivalent to the upper shell 1) can be joined together.

[0043] In this embodiment, a power button 15 is installed on the side of the upper shell 1. When in use, the power button 15 is used to turn on the power, so that the detection gas enters through the detection port 9 and comes into contact with the internal sensor 6, and the sensor 6 detects the gas.

[0044] Currently, portable gas detectors typically use 6 or 8 deep screws to secure the upper and lower shells in order to meet IP66 / 67 requirements. This makes the assembly and disassembly of the instruments cumbersome, which is not conducive to the timeliness of mass production and customer disassembly.

[0045] To solve the above problems, in this embodiment, a lower connecting pipe 16 is fixedly installed on the inner bottom wall of the sealing plate 2 in the vertical direction, and an upper connecting pipe 17 is fixedly installed on the inner top wall of the upper shell 1. The upper connecting pipe 17 has an internal thread. The upper shell 1 and the sealing plate 2 are mated together. A fixing bolt 18 is inserted from below the sealing plate 2 into the lower connecting pipe 16 and threadedly connected to the upper connecting pipe 17 to fix the upper shell 1 and the sealing plate 2. Using a single fixing bolt 18, disassembly and installation are convenient, and it is easy to replace the battery in the inspection box.

[0046] The batteries in existing gas detectors are generally encapsulated, meaning they can only be charged to maintain the instrument's power. Charging these batteries takes a long time, and charging is inconvenient in some locations. This impacts user experience and the need for emergency use.

[0047] With the above solution, using disposable batteries 5, when battery 5 needs to be replaced, the fixing bolts 18 are removed, and then the upper shell 1 and sealing plate 2 are detached. A ribbon cable 19 is fixedly installed on the lower end face of the display screen 8 on the upper shell 1, which connects to the ribbon cable socket 20 on the PCB board 3, achieving electrical connection between the display screen 8 and the PCB board 3. When disassembling the upper shell 1, the ribbon cable 19 of the display screen 8 is simultaneously pulled out from the ribbon cable socket 20. Then, the battery fixing cover and battery 5 are removed, a new battery 5 is replaced, and then the battery is reinstalled for use. Using disposable batteries 5 avoids the problem of charging; no charging is required, and the battery can be replaced immediately when the power is depleted, allowing continued use. This solves the problems of slow charging and inconvenient charging locations.

[0048] In this embodiment, a vertical curved surface 22 is provided on the top of the outer side of the upper shell 1, and an assembly surface that mates with the vertical curved surface 22 is formed at the upper end of the soft rubber 13; by providing the vertical curved surface 22 on the upper shell 1, the stability of the mating between the soft rubber 13 and the upper shell 1 is increased.

[0049] In this embodiment, a battery accommodating compartment is provided on the inner bottom wall of the sealing plate 2, and a battery fixing cover is snapped onto the battery accommodating compartment. When installing the battery 5, the battery 5 is placed into the battery accommodating compartment through the battery accommodating hole 4 of the PCB board 3, and then the battery fixing cover is snapped onto the battery accommodating compartment to fix the battery 5.

[0050] In this embodiment, spring sheets are fixedly installed at both ends of the battery accommodating hole 4 on the PCB board 3. One end of the spring sheet is fixed to the PCB board 3 and electrically connected to the circuit on the PCB board 3. The other end of the spring sheet extends into the battery accommodating compartment. When the battery 5 is located in the battery accommodating compartment, the positive and negative terminals of the battery 5 are respectively attached to the corresponding spring sheets, so as to realize the purpose of electrically connecting the battery 5 to the PCB board 3 through the spring sheets.

[0051] In this embodiment, the battery compartment includes a plurality of limiting blocks 23 fixedly disposed on the inner bottom wall of the sealing plate 2. A limiting space is formed between the limiting blocks 23 on both sides. The battery 5 is located in the limiting space. The limiting blocks 23 have the function of restricting the movement of the battery 5 in both the horizontal and vertical directions.

[0052] In this embodiment, the battery fixing cover includes a cover body 21. Vertical limiting blocks 24 are fixedly provided on both sides of the lower end face of the cover body 21. The bottom of the outer side of the vertical limiting block 24 is provided with a driving inclined surface 25 and a horizontal surface 26. The PCB board 3 and the sealing plate 2 are fixedly installed by fixing bolts 18. In use, the cover body 21 is moved downward so that the vertical limiting blocks 24 are inserted into the battery receiving holes 4 from both sides of the battery 5. The driving inclined surface 25 of the vertical limiting block 24 first contacts the edge of the battery receiving hole 4 of the PCB board 3. The cover body 21 is pressed down, and the edge of the battery receiving hole 4 of the PCB board 3 forces the vertical limiting block 24 to deform inward. When the vertical limiting block 24 moves downward to the set position, the vertical limiting block 24 returns to the vertical state to the outside. At this time, the horizontal surface 26 of the vertical limiting block 24 is inserted into the lower end face of the PCB board 3, realizing the snap-fit ​​fixing of the battery fixing cover and the PCB board 3, thereby realizing the protection and fixing of the battery 5.

[0053] In practical use, when the gas detector is not used for a long time, the internal battery 5 needs to be removed to prevent the battery 5 from slowly discharging. Removing the battery 5 requires disassembling the upper shell 1, which is quite troublesome, and the battery 5 also needs to be stored. To solve this problem, in this embodiment, each spring is provided with a spring-battery disengagement mechanism. When not in use, the spring-battery disengagement mechanism can make each spring detach from the battery 5, preventing the battery 5 from discharging after being installed in the limiting space for a long time. The operation is convenient, and the battery 5 does not need to be removed. When it is used again, the spring-battery disengagement mechanism can be used to make the spring contact with the battery 5.

[0054] In this embodiment, the spring sheet has a U-shaped structure, including a fixing plate 27 and a contact piece 28. The bottom end of the fixing plate 27 and the bottom end of the contact piece 28 are fixedly connected to form a U-shaped structure. In use, the fixing plate 27 is fixedly snapped onto the PCB board 3, and the contact piece 28 extends to the battery receiving hole 4. When the battery 5 is placed into the limiting space, the positive and negative terminals of the battery 5 contact the corresponding contact pieces 28 to achieve electrical connection. At this time, the contact piece 28 is deformed towards the fixing plate 27 by the pressure of the battery 5.

[0055] In this embodiment, the spring sheet disengagement mechanism from the battery includes a threaded sleeve 29 rotatably connected to the fixed plate 27. A threaded rod 30 is threadedly connected to the inner side of the threaded sleeve 29. An action plate 31 is fixedly disposed on the inner side of the contact piece 28 in the vertical direction. A vertical hole 32 is formed on the inner side of the action plate 31 in the vertical direction. The inner end of the threaded rod 30 passes through the vertical hole 32 and is provided with an anchor block 33. A limited-rotation block 34 is fixedly disposed at the position corresponding to the threaded rod 30 and the vertical hole 32. The limited-rotation block 34 is located inside the vertical hole 32, and both vertical inner walls of the vertical hole 32 are connected to the corresponding limited-rotation blocks 34. The outer surface of the 4-axis slides in contact, and the vertical hole 32 restricts the rotation of the rotation-limiting block 34. A driving device is provided on the upper shell 1 to drive the threaded sleeve 29 to rotate. When the gas detector is not used for a long time, it is necessary to disconnect the contact piece 28 from the positive and negative terminals of the battery 5. The threaded sleeve 29 is driven to rotate by the driving device. Since the vertical hole 32 restricts the rotation of the rotation-limiting block 34, the threaded rod 30 cannot rotate. When the threaded sleeve 29 rotates, the threaded rod 30 moves outward. The threaded rod 30 drives the action plate 31 to move outward through the anchor block 33, thereby causing the action plate 31 to move outward. The contact piece 28 is deformed and moved towards the fixed plate 27. When the contact piece 28 deforms and moves outward, the threaded rod 30 slides adaptively within the vertical hole 32 through the rotation-limiting block 34. At this time, the machine can be turned on for testing. If the machine cannot be turned on, it means that the contact piece 28 has lost contact with the positive and negative terminals of the battery 5. Simply stop rotating the threaded sleeve 29. Alternatively, the threaded sleeve 29 can be rotated by the drive device while the machine is on, and the display screen 8 can be observed. When the display screen 8 changes from lit to black, it means that the contact piece 28 has lost contact with the positive and negative terminals of the battery 5. At this time, the machine can be turned on for testing. Continue rotating the threaded sleeve 29 to disengage the contact piece 28 from the positive and negative terminals of the battery 5 by a set distance; then the contact piece 28 is separated from the battery 5, and the gas detector can be stored away without removing the battery 5 to prevent the battery 5 from slowly discharging; in use, rotate the threaded sleeve 29 through the drive device, so that the threaded sleeve 29 drives the threaded rod 30 to move towards the contact piece 28, so that the anchor block 33 moves away from the action plate 31. At this time, the contact piece 28 moves towards the battery 5 under its own elasticity until the gas detector can be turned on.

[0056] In this embodiment, the driving device includes a driving rod 35 and a driving nut 36. A first bevel gear 37 is fixedly installed at the bottom end of the driving rod 35, and a snap-fit ​​groove is opened at the top end of the driving rod 35. The driving nut 36 is rotatably connected to the upper shell 1, and a snap-fit ​​block is fixedly installed at the bottom end of the driving nut 36. The driving nut 36 is snapped with the driving rod 35 through the cooperation of the snap-fit ​​block and the snap-fit ​​groove. A second bevel gear 38 is fixedly installed on the outer surface of the threaded sleeve 29, and the second bevel gear 38 meshes with the first bevel gear 37. When it is necessary to disconnect the contact piece 28 from the positive and negative terminals of the battery 5, the gas detector is first turned on, and the display screen 8 is lit. Then, the driving nut 36 is rotated by a tool, and the driving nut 36 drives the driving rod 35 to rotate. The driving rod 35 is driven by the first bevel gear 37 and the second bevel gear 38. When the threaded sleeve 29 rotates, it drives the threaded rod 30 to move outward. The threaded rod 30, through the anchor block 33, drives the action plate 31 to move closer to the fixed plate 27, which in turn causes the contact piece 28 to deform outward. At this time, the display screen 8 turns black, indicating that the contact piece 28 has disengaged from the battery 5. When the gas detector needs to be used after a long period of storage, the same method is used: rotating the drive nut 36 drives the threaded rod 30 to move closer to the contact piece 28. The threaded rod 30 drives the anchor block 33 to move away from the action plate 31. At this time, the contact piece 28 deforms and moves closer to the battery 5 due to its elasticity until the contact piece 28 contacts the positive terminal of the battery 5, thus turning on the gas detector. The threaded sleeve 29, threaded rod 30, and drive rod 35 can be made of polyethylene material to achieve insulation.

[0057] In this embodiment, the sound amplification port 10 includes a circular hole opened on the upper end face of the upper shell 1, and a tapered tube 39 extending downward around the circumference of the circular hole. A waterproof and sound-permeable membrane 40 is fixedly disposed on the lower end face of the tapered tube 39, and the buzzer 7 is located below the waterproof and sound-permeable membrane 40. When the buzzer 7 emits sound, it enters the tapered tube 39 through the waterproof and sound-permeable membrane 40, and the sound wave is amplified by the tapered tube 39 to avoid the buzzer 7 being inaudible in noisy environments. The waterproof and sound-permeable membrane 40 is a waterproof and breathable membrane. The waterproof and breathable membrane (breathable paper) is a new type of polymer waterproof material with waterproof and breathable functions. It can maintain the sound quality unchanged, while providing an aesthetically pleasing outer cover and constructing a waterproof barrier to ensure high-quality sound transmission.

[0058] In this embodiment, the overall dimensions of the upper shell 1, soft rubber 13, and sealing plate 2 are 74*74*29mm, which is smaller than the size of a palm and easy to hold.

[0059] The working principle of this utility model is as follows: When in use, the power button 15 is pressed to turn on the device, allowing the detection gas to enter through the detection port 9 and come into contact with the internal sensor 6. The sensor 6 detects the gas. When the battery 5 needs to be replaced, the fixing bolts 18 are removed, and then the upper shell 1 and the sealing plate 2 are detached. The lower end of the display screen 8 on the upper shell 1 is fixedly provided with a ribbon cable 19, which is plugged into the ribbon cable socket 20 on the PCB board 3 to achieve electrical connection between the display screen 8 and the PCB board 3. When the upper shell 1 is removed, the ribbon cable 19 of the display screen 8 is simultaneously pulled out from the ribbon cable socket 20. Then, the cover 21 and the battery 5 are removed, a new battery 5 is replaced, and then the device is reinstalled for use. The use of disposable batteries 5 avoids the problem of charging. No charging is required, and the battery can be replaced immediately when the power is depleted for continued use. To address the issues of slow charging and inconvenient charging locations; when the gas detector is not in use for an extended period, the contact piece 28 needs to be disconnected from the positive and negative terminals of the battery 5. First, turn on the gas detector; the display screen 8 will light up. Then, rotate the drive nut 36 using a tool. The drive nut 36 drives the drive rod 35 to rotate. The drive rod 35, through the first bevel gear 37 and the second bevel gear 38, drives the threaded sleeve 29 to rotate. The threaded sleeve 29 drives the threaded rod 30 to move outward. The threaded rod 30, through the anchor block 33, drives the action plate 31 to move closer to the fixed plate 2. The movement of contact piece 28 causes it to deform outward, and the blackening of display screen 8 indicates that contact piece 28 has detached from battery 5. When the gas detector needs to be used after a long period of storage, the same method is used: rotating the drive nut 36 moves the threaded rod 30 towards the contact piece 28. The threaded rod 30 moves the anchor block 33 away from the action plate 31. At this time, contact piece 28 deforms and moves towards battery 5 due to its elasticity until contact piece 28 contacts the positive terminal of battery 5, thus opening the gas detector. When replacing battery 5 and opening the upper shell 1, the locking block of drive nut 36 on the upper shell 1 disengages from the locking groove of drive rod 35. During installation, the locking block of drive nut 36 is inserted into the locking groove of drive rod 35, enabling drive nut 36 to rotate drive rod 35.

Claims

1. A portable gas detector, characterized in that: The upper shell (1) and sealing plate (2) are fixed to each other. An accommodating space is formed between the upper shell (1) and sealing plate (2), and a PCB board (3) is provided in the accommodating space. A lip plate (11) is provided on the outer edge of the lower end face of the upper shell (1). An assembly plate (12) is fixed on the outer side of the sealing plate (2). The upper end face of the assembly plate (12) is in contact with the lower end face of the upper shell (1). An annular groove is formed between the outer side of the assembly plate (12) and the lip plate (11). A soft rubber (13) is provided on the outer surface of the upper shell (1). The bottom of the soft rubber (13) extends around the lower end face of the lip plate (11) into the annular groove. A protrusion (14) is provided on the side of the soft rubber (13) in the annular groove that is in contact with the assembly plate (12) to form an interference fit with the assembly plate (12) to achieve watertightness between the upper shell (1) and the sealing plate (2).

2. The portable gas detector according to claim 1, characterized in that: The sealing plate (2) has a lower connecting pipe (16) fixedly installed on the inner bottom wall in the vertical direction, and the upper shell (1) has an upper connecting pipe (17) fixedly installed on the inner top wall. The upper connecting pipe (17) has an internal thread. The upper shell (1) and the sealing plate (2) are connected together. A fixing bolt (18) is inserted from below the sealing plate (2) into the lower connecting pipe (16) and threadedly connected to the upper connecting pipe (17).

3. The portable gas detector according to claim 1, characterized in that: The top of the outer side of the upper shell (1) is provided with a vertical curved surface (22), and the upper end of the soft rubber (13) is formed with an assembly surface that matches the vertical curved surface (22).

4. The portable gas detector according to claim 1, characterized in that: The inner bottom wall of the sealing plate (2) is provided with a battery compartment, and a battery fixing cover is snapped onto the battery compartment.

5. The portable gas detector according to claim 4, characterized in that: Spring sheets are fixedly installed at both ends of the battery accommodating hole (4) on the PCB board (3). One end of the spring sheet is fixed to the PCB board (3) and electrically connected to the circuit on the PCB board (3). The other end of the spring sheet extends into the battery accommodating compartment. When the battery (5) is located in the battery accommodating compartment, the positive and negative terminals of the battery (5) are respectively attached to the corresponding spring sheets, so that the battery (5) is electrically connected to the PCB board (3) through the spring sheets.

6. The portable gas detector according to claim 5, characterized in that: The battery compartment includes several limiting blocks (23) fixedly disposed on the inner bottom wall of the sealing plate (2), and a limiting space is formed between the limiting blocks (23) on both sides, and the battery (5) is located in the limiting space.

7. The portable gas detector according to claim 5, characterized in that: The battery fixing cover includes a cover body (21), and vertical limiting blocks (24) are fixedly provided on both sides of the lower end face of the cover body (21). A driving inclined surface (25) and a horizontal surface (26) are opened at the bottom of the outer side of the vertical limiting block (24). The PCB board (3) and the sealing plate (2) are fixedly provided by fixing bolts (18).

8. The portable gas detector according to claim 7, characterized in that: The spring sheet has a U-shaped structure, including a fixing plate (27) and a contact piece (28). The bottom end of the fixing plate (27) and the bottom end of the contact piece (28) are fixedly connected to form a U-shaped structure. Each spring sheet is provided with a spring sheet disengagement mechanism from the battery. The spring sheet disengagement mechanism from the battery includes a threaded sleeve (29) that is rotatably connected to the fixing plate (27). A threaded rod (30) is threadedly connected to the threaded sleeve (29). An action plate (31) is fixedly provided on the inner side of the contact piece (28) in the vertical direction. The inner side of the action plate (31) is fixedly provided in the vertical direction. A vertical hole (32) is provided in the direction. The inner end of the threaded rod (30) passes through the vertical hole (32) and is provided with an anchor block (33). A limited rotation block (34) is fixedly provided at the position corresponding to the threaded rod (30) and the vertical hole (32). The limited rotation block (34) is located in the vertical hole (32), and the inner sidewalls of the two vertical directions of the vertical hole (32) are in sliding contact with the outer side of the corresponding limited rotation block (34). The vertical hole (32) restricts the rotation of the limited rotation block (34). A driving device is provided on the upper shell (1). The driving device is used to drive the threaded sleeve (29) to rotate.

9. The portable gas detector according to claim 8, characterized in that: The driving device includes a driving rod (35) and a driving nut (36). A first bevel gear (37) is fixedly provided at the bottom end of the driving rod (35). A snap-fit ​​groove is provided at the top end of the driving rod (35). The driving nut (36) is rotatably connected inside the upper shell (1). A snap-fit ​​block is fixedly provided at the bottom end of the driving nut (36). The driving nut (36) is snapped with the driving rod (35) through the cooperation of the snap-fit ​​block and the snap-fit ​​groove. A second bevel gear (38) is fixedly provided on the outer surface of the threaded sleeve (29). The second bevel gear (38) meshes with the first bevel gear (37).

10. The portable gas detector according to claim 1, characterized in that: The sound amplification port (10) includes a circular hole opened on the upper end face of the upper shell (1) and a tapered tube (39) extending downward around the circumference of the circular hole. A waterproof and sound-permeable membrane (40) is fixedly provided on the lower end face of the tapered tube (39), and a buzzer (7) is located below the waterproof and sound-permeable membrane (40).

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