Gas detection device

Abstract

The invention provides a gas detection device which comprises a bottom shell, a flow guide cover, a detector module and an upper cover, the flow guide cover covers the bottom of the bottom shell, the detector module comprises a detector probe, the detector probe is matched with the flow guide cover in an inserted mode, and the upper cover is fixedly connected with the bottom shell. The response time of the gas detection device is shortened.

Description

Technical Field

[0001] The present application relates to the field of detectors, and in particular to a gas detection device. Background Art

[0002] The gas detection device of the related art includes a housing and a gas detector located in the housing, the gas detector includes a circuit board and a probe connected to the circuit board, and the housing is provided with a ventilation structure for the gas to be detected to enter the housing. However, the sensitivity of this gas detection device is low, and a gas detection device with high sensitivity is urgently needed. Summary of the invention

[0003] The present application provides a gas detection device, which is used to improve the sensitivity of the gas detection device.

[0004] The present application provides a gas detection device, which adopts the following technical solution:

[0005] A gas detection device comprises a bottom shell, a flow guide cover, a detector module and an upper cover. The flow guide cover is arranged at the bottom of the bottom shell. The detector module comprises a detector probe which is plugged into the flow guide cover. The upper cover is fixedly connected to the bottom shell.

[0006] Through the above technical solution: when the gas to be measured flows through the bottom shell, it will enter the bottom shell from the air intake structure of the bottom shell. After the airflow approaches the guide cover, a Coanda effect will be generated, that is, the gas flow to be measured will approach the detector probe along the inner wall of the guide cover and converge near the detector probe, so that the detector probe can detect the concentration change of the gas to be measured more quickly, thereby improving the sensitivity of the detector.

[0007] A gas detection device includes a bottom shell, a guide cover, and a detection module. The bottom shell is provided with an air inlet, and the detection module includes a detector probe. The guide cover includes a guide plate and a positioning plate. The positioning plate and the detector probe are fixedly connected or limit-connected. The guide plate is arranged around the circumference of the positioning plate. The guide plate includes a first end and a second end. The first end of the guide plate is fixedly connected to the positioning plate or is an integral part. The second end of the guide plate is limit-connected, fixedly connected or is an integral part to the bottom shell. The guide plate extends obliquely from the first end to the second end. The arrangement direction of the detector probe and the air inlet is defined as a first direction. The projection area of ​​the guide plate in a plane perpendicular to the first direction gradually increases from the first end to the second end.

[0008] Through the above technical scheme: when the gas to be measured flows through the bottom shell, the airflow formed by the gas to be measured can enter the bottom shell through the air inlet hole, and contact with the part close to the second end of the guide plate to produce the Coanda effect, that is, the gas to be measured will flow along the inclined guide plate to the positioning plate, and gather near the positioning plate so that the concentration of the gas to be measured around the positioning plate changes, so that the detector probe arranged on the positioning plate can detect the concentration change of the gas to be measured in the bottom shell more quickly, thereby improving the sensitivity of the gas detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0010] Figure 1 attempted explosion of the gas detection device;

[0011] Figure 2 is a schematic diagram of the structure of the bottom shell;

[0012] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0013] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0014] Figure 5 A schematic diagram showing the structure after the bottom shell and the detection module are assembled;

[0015] Figure 6 It is a schematic diagram of the structure of the air deflector;

[0016] Figure 7 A partial cross-sectional view for showing a breathable membrane;

[0017] Figure 8 A schematic diagram of the structure of the top cover.

[0018] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.

[0019] Explanation of the reference numerals: 1. bottom shell; 11. connecting part; 12. wire groove; 121. wire clamping fin; 13. locking block; 14. winding column; 15. wire clamping plate; 16. guide plate; 161. supporting part; 17. first positioning plate; 171. positioning column; 18. positioning card; 19. waterproof sealing groove; 2. detection part; 21. air inlet; 22. positioning slot; 3. breathable membrane; 4. breathable membrane pressure plate; 5. guide cover; 51. guide plate; 51. plug-in hole; 52. positioning buckle; 53. positioning plate; 531. plug-in hole; 6. detection module; 61. detector probe; 7. top cover; 71. mounting part; 72. mounting hole; 73. connecting groove; 74. assembly hole; 75. wire pressing block; 76. wire pressing groove; 77. waterproof boss; 78. locking buckle; 8. waterproof rubber ring. DETAILED DESCRIPTION

[0020] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0021] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0022] A gas detection device, such as Figure 1-8 As shown, it includes a bottom shell 1, a breathable membrane 3, a guide cover 5, a detection module 6 and an upper cover. The breathable membrane 3 is arranged in the bottom shell 1 and is fixedly connected to the bottom shell 1. The guide cover 5 is covered on the breathable membrane 3 and is connected to the inner wall of the bottom shell 1. The detection element is plugged and matched with the guide cover 5 and is connected to the bottom shell 1. The upper cover is arranged on the top of the bottom shell 1 and is screwed to the upper cover by screws.

[0023] When assembling the gas detection device, the breathable membrane 3 is fixed inside the bottom shell 1, and then the guide cover 5 is covered on the breathable membrane 3, and the detection module 6 is plugged into the guide cover 5, and finally the upper cover is fixedly connected to the bottom shell 1 by screws, thereby completing the installation of the gas detection device. When the gas detection device is working, the gas to be detected passes through the breathable membrane 3 and flows toward the detection module 6 under the guidance of the guide cover 5, so that the detection module 6 can quickly contact the gas to be detected passing through the breathable membrane 3, thereby shortening the response time of the detection module 6.

[0024] The bottom shell 1 is a rectangular shell structure. The four corners of the bottom shell 1 are integrally formed with connecting parts 11 for connecting the upper cover, and the top surface of the connecting part 11 is provided with threaded holes. The bottom shell 1 is integrally formed with a wire groove 12. The wire groove 12 is semi-cylindrical. The wire groove 12 is located at one end of the length direction of the bottom shell 1, and the axial direction of the wire groove 12 is parallel to the shorter side of the bottom shell 1. The wire groove 12 is fixedly connected with a wire clamping fin 121. The fins are provided with multiple pairs. Each pair of fins is arranged in an eight-shaped shape and is respectively fixedly connected to the inner side wall of the wire groove 12. The multiple pairs of fins are arranged equidistantly along the axial direction of the wire groove 12. The bottom surface of the bottom shell 1 is also fixedly connected with a winding post 14. The winding post 14 is vertically arranged and located on the extension line of the axis of the wire groove 12. The side wall of the bottom shell 1 close to the winding post 14 is also fixedly connected with a wire clamping plate 15. The wire clamping plate 15 is vertically arranged and located on both sides of the winding post 14.

[0025] The setting of the wire groove 12 can be used to accommodate the wire harness connected to the detection module 6. The wire clamping fins 121 in the wire groove 12 can clamp the wire harness on the one hand, and on the other hand, multiple groups of wire harness fins arranged in an eight-shaped shape can form a multi-layer water-retaining structure in the wire groove, thereby improving the waterproof performance of the gas detection device. The setting of the winding pole 14 can facilitate winding when installing the detection module 6 and its wire harness. The winding pole 14 is used in conjunction with the wire clamping plate 15 to fix the wire that bypasses the winding pole 14.

[0026] The bottom of the bottom shell 1 is integrally formed with a guide plate 16, and the side wall of the bottom shell 1 is integrally formed with the guide plate 16. The guide plate 16 is vertically arranged, and the guide plate 16 is a right-angled trapezoidal plate-shaped structure. The longest side of the guide plate 16 is fixedly connected to the side wall of the bottom shell 1. The side wall of the bottom shell 1 is also fixedly connected with a first positioning plate 17, and the first positioning plate 17 is L-shaped. The end of the horizontal section of the first positioning plate 17 is fixedly connected with a positioning column 171, and the positioning column 171 is a vertically arranged hollow columnar structure. The bottom end of the positioning column 171 is fixedly connected to the bottom surface of the bottom shell 1, and the outer wall of the positioning column 171 is fixedly connected with a reinforcing rib plate. The guide plate 16 on the opposite side of the first positioning plate 17 is integrally formed with a support portion 161, and the support portion 161 is located on the side of the guide plate 16 close to the first positioning plate 17. The support portion 161 is a vertically arranged rectangular plate-shaped structure, and the bottom of the support portion 161 is fixedly connected to the bottom shell 1, and the top of the support portion 161 is flush with the top surface of the horizontal short side of the support plate. The side wall of the bottom shell 1 is also fixedly connected with a positioning block, which is a wedge-shaped structure arranged horizontally, and the bottom surface of the positioning block is parallel to the top surface of the horizontal section of the support plate, and the bottom surface of the positioning block is higher than the top surface of the horizontal section of the support plate. A positioning card 18 is fixedly connected to the bottom surface of the bottom shell 1 on the opposite side of the positioning block, and the positioning card 18 is in an inverted L shape, the bottom end of the vertical section of the positioning card 18 is fixedly connected to the bottom surface of the bottom shell 1, and the free end of the top surface of the horizontal section of the positioning card 18 is a plane arranged tilted downward, and the bottom surface of the horizontal section of the positioning card 18 is flush with the bottom surface of the positioning block.

[0027] The setting of the guide plate 16 can be used to guide and roughly position the detection module 6 when assembling the detection module 6, so that the detection module 6 is positioned at the preset installation position in the middle of the bottom shell 1, and the positioning column 171 is plugged and matched with the detection module 6 to complete the precise positioning of the detection module 6. The setting of the support plate and the support part 161 can provide vertical support for the detection module 6. The setting of the positioning block and the positioning card 18 can provide pressure for the detection module 6, thereby cooperating with the support plate and the support part 161 to provide vertical clamping and positioning for the detection module 6, so that the detection module 6 can be stably installed in the bottom shell 1.

[0028] A detection part 2 for accommodating a detection element is integrally formed on the bottom surface of the bottom shell 1. The detection part 2 is a shell containing a cavity approximately in the shape of a rectangular parallelepiped. An air inlet hole 21 is provided on the bottom surface of the detection part 2. There are multiple air inlet holes 21, and the total opening area of ​​the multiple air inlet holes 21 is S1. The detection module 6 includes a detector probe 61 for detecting gas. The detector probe 61 is cylindrical, and the circular end surface area of ​​the detector probe 61 is S2. The relationship between S1 and S2 satisfies 9.5≤S1 / S2≤10. The breathable membrane 3 is covered on the bottom surface of the detection part 2, and the top surface of the breathable membrane 3 is covered with a breathable membrane pressing plate 4. The breathable membrane pressing plate 4 is also provided with an air inlet hole 21, and the air inlet hole 21 of the breathable membrane pressing plate 4 coincides with the air inlet hole 21 on the bottom surface of the detection part 2. The breathable membrane pressing plate 4 is bonded to the breathable membrane 3, and the edge of the breathable membrane pressing plate 4 is fixedly connected to the inner wall of the detection part 2.

[0029] The detection part 2 is used to accommodate the deflector 5 and the detector probe 61. The setting of the air inlet 21 can provide a flow channel for the detection part 2 to exchange gas with the outside world. The breathable membrane pressing plate 4 provides pressure for the breathable membrane 3, so that the breathable membrane 3 is tightly against the inner bottom surface of the detection part 2 and clamped between the breathable membrane pressing plate 4 and the bottom shell 1. The breathable membrane pressing plate 4 can also provide positioning and support for the breathable membrane 3 when gas enters the air inlet, preventing the breathable membrane 3 from separating from the bottom shell 1, and providing protection for the waterproof effect of the breathable membrane 3. Keeping the ratio of the total opening area S1 of the air inlet 21 to the circular end surface area S2 of the detector probe 61 within the range of 9.5≤S1 / S2≤10 can effectively improve the contact efficiency between the gas and the detector probe 61 and effectively shorten the response time.

[0030] The deflector 5 includes a deflector plate 51 and a positioning plate 53. The positioning plate 53 is provided with a plug hole 531. The plug hole 531 is interference fit with the detector probe 61. There are four deflector plates 51. The four deflector plates 51 are connected end to end and arranged around and fixedly connected. The side of the four deflector plates 51 close to the deflector plate 51 is integrally formed with the deflector plate 51. The side of the deflector plate 51 away from the positioning plate 53 is inclined in the direction close to the inner wall of the detection part 2. The four deflector plates 51 are respectively fixedly connected to the four inner walls of the detection part 2. One of the four deflector plates 51 is also provided with a humidity sampling hole. The detection module 6 also includes a humidity sensor for detecting humidity. When the detector probe 61 is plugged into the deflector 5, the distance H between the end face of the detector probe 61 and the breathable membrane 3 satisfies 2mm≤H≤4mm, and the humidity sampling hole is located below the humidity sensor. The two ends of the outer edge of the rectangular deflector 5 along the length direction are fixedly connected with positioning buckles 52, and the inner wall of the detection part 2 is provided with a positioning card slot 22 used in conjunction with the buckle.

[0031] The setting of the guide cover 5 can form a cavity together with the bottom shell 1 and the breathable membrane pressure plate 4, and the position of the guide cover 5 can be fixed by the positioning buckle 52 and the positioning slot 22; the inclined side wall of the guide cover 5 can guide the gas entering the detection part 2, so that the gas flows quickly to the detector probe 61, and the guide cover 5 can also locate the position of the probe, so that the distance H between the end face of the detector probe 61 and the breathable membrane 3 satisfies 2mm≤H≤4mm, thereby further shortening the response time of the detector.

[0032] The top cover 7 is a rectangular plate-like structure, with mounting parts 71 integrally formed at both ends of the top cover 7 in the length direction, and mounting holes 72 are provided on the mounting parts 71. A connecting groove 73 for plugging and matching with the connecting part 11 of the bottom shell 1 is provided at the connection between the mounting part 71 and the top cover 7, and an assembly hole 74 for use with the threaded hole of the connecting part 11 is provided on the connecting groove 73, and the axis of the assembly hole 74 coincides with the axis of the threaded hole. A wire pressing block 75 for fixing the wiring harness is fixedly connected to the side of the top cover 7 close to the bottom shell 1, and a semi-cylindrical wire pressing groove 76 is provided in the middle of the end face of the wire pressing block 75, and the diameter of the wire pressing groove 76 is the same as the diameter of the wire passing groove 12, and the wire pressing block 75 is plugged and matched with the bottom shell 1.

[0033] The installation portion 71 can provide a reserved installation hole for installation when the gas detection device is used. The connection groove 73 is plugged into the connection portion 11 of the bottom shell 1, which can provide auxiliary positioning for the installation work when the bottom shell 1 and the top cover 7 are installed, so that the assembly hole 74 is aligned with the threaded hole of the connection portion 11, thereby improving the installation efficiency. The setting of the wire pressing block 75 and the wire pressing groove 76 can make the top cover 7, the bottom shell 1 and the wire material fit tightly, thereby improving the waterproof performance.

[0034] A waterproof sealing groove 19 is provided on the top surface of the side wall of the bottom shell 1, and a waterproof rubber ring 8 is arranged in the waterproof sealing groove 19. The waterproof sealing groove 19 is plugged into the waterproof rubber ring 8, and the waterproof sealing groove 19 is fixedly connected to the bottom shell 1. A waterproof boss 77 plugged into the waterproof sealing groove 19 is integrally formed on the side of the top cover 7 close to the bottom shell 1. A receiving groove plugged into the waterproof rubber ring 8 is provided on the wire pressing block 75. The width of the receiving groove is the same as the width of the waterproof rubber ring 8. A locking buckle 78 is fixedly connected in the waterproof boss 77, and a locking block 13 plug-fitted with the locking buckle 78 is integrally formed on the inner wall of the bottom shell 1.

[0035] The waterproof sealing groove 19 is plugged into the waterproof boss 77 to form two obstacles at the joint between the bottom shell 1 and the top cover 7 to prevent moisture from entering the bottom shell 1 and the top cover 7. The waterproof boss 77 is plugged into the waterproof sealing groove 19 to squeeze the waterproof rubber ring 8, causing the waterproof rubber ring 8 to elastically deform and fill the gap between the waterproof boss 77 and the waterproof sealing groove 19 to achieve a waterproof function. The locking buckle 78 is snap-fitted into the locking block 13 to fix the bottom shell 1 and the top cover 7, so that the waterproof rubber ring 8 remains squeezed, thereby extending the sealing and waterproofing time.

[0036] When assembling the gas detection device, firstly, the breathable membrane 3 is pressed and bonded to the breathable membrane 3, and then the bonded breathable membrane 3 and the breathable membrane 3 are pressed and installed into the detection part 2 of the bottom shell 1, so that the breathable membrane 3 is clamped between the breathable membrane 3 clamping plate and the inner bottom surface of the detection part 2; then, the deflector 5 is installed into the detection part 2, and the positioning buckle 52 is snap-fitted with the positioning slot 22, so as to complete the fixed installation of the deflector 5; thereafter, the detection module 6 is installed into the bottom shell 1, and the positioning column 171 is plugged and matched with the detector module. Insert the detector probe 61, and embed the detection module 6 between the positioning card 18, the positioning block and the support plate, so as to complete the assembly of the detection module 6. Finally, set the top cover 7 on the top of the bottom shell 1, so that the waterproof boss 77 is plugged into the waterproof sealing groove 19 and the waterproof boss 77 squeezes the waterproof sealing strip, and the locking buckle 78 is engaged with the locking block 13, and then the bolt connection between the connecting part 11 and the mounting hole 72 is completed by screws. At this point, the assembly of the gas detection device is completed. When using the gas detection device, the gas detection device is installed through the mounting part 71, the circuit is connected and started, and the gas to be tested will pass through the breathable membrane 3 into the cavity surrounded by the guide cover 5 and the bottom shell 1 and the breathable membrane pressure plate 4. After entering the cavity, the gas will flow along the inclined side wall of the guide cover 5 to the detector probe 61, and the detector probe 61 will detect the gas entering the cavity, thereby realizing the gas detection function.

[0037] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0038] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A gas detection device, characterized in that: The invention comprises a bottom shell (1), a shroud (5), a detection module (6) and a top cover (7); the bottom of the bottom shell (1) is provided with an air intake structure; the shroud (5) is covered at the bottom of the bottom shell (1); the detection module (6) comprises a detector probe (61); the detector probe (61) is plug-fitted with the shroud (5); and the top cover (7) is fixedly connected to the bottom shell (1).

2. The gas detection device according to claim 1, characterized in that: The bottom shell (1) is integrally formed with a detection part (2); the air intake structure comprises an air intake hole (21); the air intake hole (21) is opened in the detection part (2); a breathable membrane (3) is arranged inside the detection part (2); the breathable membrane (3) covers the air intake hole (21); and the air guide cover (5) is fixedly connected to the inner wall of the detection part (2).

3. The gas detection device according to claim 2, characterized in that: The inner wall of the detection part (2) is provided with a positioning slot (22), the outer wall of the air deflector (5) is fixedly connected with a positioning buckle (52) used in conjunction with the positioning slot (22), and the air deflector (5) and the inner wall of the detection part (2) are connected in a limited manner via the positioning slot (22) and the positioning buckle (52).

4. The gas detection device according to claim 2, characterized in that: The breathable membrane (3) is fixedly connected to a breathable membrane pressing plate (4), and the breathable membrane pressing plate (4) is provided with an air inlet hole (21).

5. The gas detection device according to any one of claims 2 to 4, characterized in that: The total opening area of ​​the air inlet (21) is S1, the area of ​​the end surface of the detector probe (61) is S2, and the relationship between S1 and S2 satisfies 9.5≤S1 / S2≤10.

6. The gas detection device according to claim 5, characterized in that: The distance between the end surface of the detector probe (61) and the gas permeable membrane (3) is H, and H satisfies 2mm≤H≤4mm.

7. The gas detection device according to claim 1, characterized in that: The detection module (6) also includes a humidity sensor, and the air guide cover (5) is also provided with a humidity sampling hole for use in conjunction with the humidity sensor.

8. A gas detection device, characterized in that: The invention comprises a bottom shell (1), a flow guide cover (5), and a detection module (6); the bottom shell (1) is provided with an air inlet hole (21); the detection module (6) comprises a detector probe (61); the flow guide cover comprises a flow guide plate (51) and a positioning plate (53); the positioning plate (53) and the detector probe (61) are fixedly connected or position-limitedly connected; the flow guide plate (51) is arranged around the circumference of the positioning plate (53); the flow guide plate (51) comprises a first end and a second end; the flow guide plate ( The first end of the guide plate (51) is fixedly connected to the positioning plate (53) or is an integral part, the second end of the guide plate (51) is limitedly connected, fixedly connected or is an integral part to the bottom shell (1), the guide plate (51) extends obliquely from the first end to the second end, and the arrangement direction of the detector probe (61) and the air inlet (21) is defined as a first direction, and the projection area of ​​the guide plate (51) in a plane perpendicular to the first direction gradually increases from the first end to the second end.

9. The gas detection device according to claim 8, characterized in that: The gas detection device comprises a top cover (7), wherein the top cover (7) is located on a side of the positioning plate (53) away from the air inlet hole (21), and the top cover (7) is connected to the bottom shell (1), and a detection part (2) is integrally formed on a side of the bottom shell (1) away from the top cover (7), the detection part (2) is provided with a cavity, the detection module (6) is arranged in the cavity of the detection part (2), the air inlet hole (21) is opened in the detection part (2), a breathable membrane (3) is arranged in the cavity of the detection part (2), the breathable membrane (3) covers the air inlet hole (21), and the guide cover (5) is fixedly connected to the inner wall of the detection part (2).

10. The gas detection device according to claim 9, characterized in that: The inner wall of the detection part (2) is provided with a positioning slot (22); the side wall of the air deflector (5) close to the detection part (2) is integrally formed with a positioning buckle (52) for use with the positioning slot (22); the air deflector (5) and the inner wall of the detection part (2) are connected in a limited position via the positioning slot (22) and the positioning buckle (52).

11. The gas detection device according to claim 10, characterized in that: The breathable membrane (3) is fixedly connected to a breathable membrane pressing plate (4), and the breathable membrane pressing plate (4) is provided with an air inlet hole (21). The air inlet hole (21) of the breathable membrane pressing plate (4) and the projection of the air inlet hole (21) of the detection part (22) in the thickness direction of the breathable membrane pressing plate (4) coincide with each other.

12. The gas detection device according to any one of claims 9 to 11, characterized in that: The total opening area of ​​the air inlet (21) is S1, the area of ​​the end surface of the detector probe (61) is S2, and the relationship between S1 and S2 satisfies 9.5≤S1 / S2≤10.

13. The gas detection device according to claim 12, characterized in that: The distance between the end surface of the detector probe (61) and the gas permeable membrane (3) is H, and H satisfies 2mm≤H≤4mm.

14. The gas detection device according to claim 13, characterized in that: The detection module (6) also includes a humidity sensor, and the air guide cover (5) is also provided with a humidity sampling hole for use in conjunction with the humidity sensor.

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