A sampling mechanism and flow meter based on gas detection

Abstract

The present invention relates to the field of gas sampling technology, and discloses a sampling mechanism and flowmeter based on gas detection, wherein a sampling mechanism based on gas detection includes a flowmeter volume corrector, a vent pipe arranged at the bottom of the flowmeter volume corrector, a sliding rod arranged inside the vent pipe, and a flowmeter base meter arranged at the bottom of the vent pipe, a sensor arranged at the top of the sliding rod, and also includes a sampling mechanism arranged on one side of the middle of the vent pipe; the sampling mechanism includes a collection bottle threadedly arranged on one side of the middle of the vent pipe, a sealing component arranged at the mouth of the collection bottle, an exhaust component arranged on one side of the bottom of the collection bottle, and an air intake component arranged in the middle of the vent pipe. Through the sampling mechanism, the flowmeter can collect gas while measuring the flow rate, thereby facilitating the subsequent detection of the gas to be detected, and enhancing the versatility and use effect of the flowmeter.

Description

Technical Field

[0001] The present invention relates to the technical field of gas sampling, and in particular to a sampling mechanism and a flow meter based on gas detection. Background Art

[0002] A flow meter is an instrument used to measure the flow of liquid or gas. It can calculate the flow rate of the fluid by measuring the speed and pressure changes of the fluid in the pipeline. Flow meters are widely used in various industrial fields, such as petrochemical, natural gas transportation, water treatment, food and beverage packaging and other industries.

[0003] When used in industry, the flow meter is usually fixedly installed on the gas delivery pipe. After the gas flows through the flow meter, the flow meter can display the flow rate, pressure and other information of the gas. However, when testing the gas transported by these pipelines, since the pipelines are closed, the gas detection and collection operation becomes particularly difficult. It is often necessary to collect the gas at the source of generation or the end of the discharge, but since the space of both is large, the gas is difficult to collect, the concentration is low, and it will be mixed with air, which will affect the subsequent detection results of the gas and make the detection results inaccurate. Therefore, a sampling mechanism based on gas detection is urgently needed to solve the above problems. Summary of the invention

[0004] In view of the problems in the prior art that gas collection is difficult, the collection concentration is not high, and it is easy to mix with air, resulting in inaccurate detection results, a sampling mechanism and flow meter based on gas detection are proposed.

[0005] The purpose is to enable the flow meter to collect gas while measuring flow, thereby facilitating subsequent detection of the gas to be detected and enhancing the versatility and use effect of the flow meter.

[0006] The technical solution of the present invention is a sampling mechanism based on gas detection, comprising a flow meter volume corrector, a flow meter base meter arranged at the bottom of the flow meter volume corrector, a vent pipe arranged at one side of the top of the flow meter base meter, a baffle plate arranged at one side of the bottom of the vent pipe, and the bottom of the baffle plate extends into the flow meter base meter, the baffle plate is in a concave and inclined shape, a sliding rod arranged at the top of the vent pipe inner cavity, a pressure sensor arranged at the top of the flow meter base meter inner cavity, a temperature sensor arranged at one side of the pressure sensor, and a flow sensor arranged at the bottom of the flow meter base meter inner cavity, and also includes a sampling mechanism arranged at one side of the middle part of the vent pipe;

[0007] The sampling mechanism comprises a collection bottle threadedly arranged on one side of the middle part of the ventilation pipe, a sealing component arranged at the mouth of the collection bottle, an exhaust component arranged on one side of the bottom of the collection bottle, and an air intake component arranged in the middle part of the ventilation pipe;

[0008] The air intake component is used to generate negative pressure inside the ventilation pipe so that gas can be sucked into the ventilation pipe. The sealing component opens after being squeezed by the air intake component, and cooperates with the negative pressure generated in the ventilation pipe so that gas can enter the collection bottle. The exhaust component is used to open the collection bottle when air is taken in so that the original gas inside is squeezed out.

[0009] The air intake component includes a rotating assembly arranged in the middle of the ventilation pipe and a negative pressure assembly arranged on the top of the rotating assembly; the rotating assembly includes a rotating groove opened on the tube wall in the middle of the ventilation pipe, a sealing ring matched with the rotating groove, a lever arranged on one side of the sealing ring, a connecting rod arranged on the top of the sealing ring, a rotating plate arranged on one side of the connecting rod, an arc groove opened on one side of the rotating plate, and a ring array of through holes opened on the rotating plate, and the middle part of the rotating plate is rotatably connected to the sliding rod.

[0010] Furthermore, the negative pressure assembly includes an extrusion rod arranged on the top of the rotating plate, a negative pressure plate arranged on the sliding rod, an extrusion block arranged at the bottom of the negative pressure plate, and the top of the extrusion rod abuts against the bottom of the negative pressure plate, and limit strips symmetrically arranged on both sides of the sliding rod, and the middle part of the negative pressure plate is slidably connected to the limit strip, and the side wall of the negative pressure plate is sealed and slidably connected to the inner wall of the ventilation pipe.

[0011] Furthermore, the bottom surface of the extrusion block is spiral-shaped, and the top of the extrusion rod is slidably connected to the bottom surface of the extrusion block.

[0012] Furthermore, the sealing component includes a first sealing component arranged on the ventilation pipe, and a second sealing component arranged at the mouth of the collection bottle, the first sealing component includes a collection port opened on one side of the middle of the ventilation pipe, a baffle plate arranged on one side inside the collection port, one side of the baffle plate is in a smooth protrusion shape, a ventilation hole opened in the middle of the baffle plate, a baffle ball arranged in the ventilation hole, and one side of the baffle ball abuts against the arc groove, a pressure strip arranged on the baffle ball in a ring array, an extrusion groove opened on the side wall of the collection port, an extrusion piece arranged in the extrusion groove, and one side of the four pressure strips is fixedly connected to the extrusion piece, and an extrusion rod is arranged on one side of the baffle ball.

[0013] Furthermore, the second sealing assembly includes a sealing plate arranged at the mouth of the collection bottle, an extrusion hole opened in the middle of the sealing plate, a compression groove opened in the mouth of the collection bottle, a compression member arranged in the compression groove, an abutment plate arranged on one side of the compression member, and air inlet holes opened in a ring array on the abutment plate, and one side of the sealing plate abuts against the abutment plate.

[0014] Furthermore, the exhaust component includes a pushing assembly arranged on one side of the abutment plate, and an exhaust assembly arranged on one side of the pushing assembly; the pushing assembly includes a pushing rod arranged on one side of the abutment plate, a pressing rod arranged on one side of the pushing rod, and an extrusion inclined hole opened at the bottom of the pressing rod.

[0015] Furthermore, the bottom of the extrusion inclined hole is inclined, and one side of the push rod abuts against the bottom of the extrusion inclined hole.

[0016] Furthermore, the exhaust assembly includes an exhaust port arranged on one side of the bottom of the collection bottle, a fixed plate arranged at the bottom of the exhaust port, an exhaust member arranged at the top of the fixed plate, a pressing plate arranged at the top of the exhaust member, exhaust holes opened through the fixed plate and the middle of the pressing plate, a pressing rod arranged in a circular array at the bottom of the pressing plate and passing through the fixed plate, and an exhaust plate arranged at the bottom of four pressing strips, and the bottom of the exhaust plate is fixedly connected to the top of the lower pressure rod, and the top of the exhaust plate is abutted against the bottom of the fixed plate.

[0017] Another object of the present invention is to provide a flow meter, the purpose of which is to improve the explosion-proof performance and aesthetic performance of the flow meter and avoid the influence of external contact pressing on the sealing performance of the flow meter.

[0018] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a flow meter, comprising a flow meter volume corrector, an explosion-proof shell arranged on the flow meter volume corrector, a transmitting antenna arranged on the flow meter volume corrector, a touch display screen arranged on one side of the flow meter volume corrector, an explosion-proof glass arranged on the side of the explosion-proof shell away from the flow meter volume corrector, and a pressing component arranged between the explosion-proof glass and the display screen.

[0019] Furthermore, the pressing assembly includes a pressing column arranged at the bottom of the explosion-proof glass, a soft pressure block arranged at the bottom of the pressing column, a sliding column arranged at the top of the touch display screen, and a pressing spring arranged inside the sliding column, and the top of the pressing spring is fixedly connected to the bottom of the pressing column, and the shape of the pressing column is T-shaped.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Through the sampling mechanism, the flow meter can collect gas while measuring the flow rate, which is convenient for subsequent detection of the gas to be detected, enhancing the versatility and use effect of the flow meter, and the collection bottle can be disassembled and taken away for detection, which not only improves the convenience of detection, but also does not affect the sealing of the collection bottle, and can ensure the accuracy of the test results.

[0022] 2. By setting up the first sealing component, opening the second sealing component and the exhaust component, the collection bottle can be in a circulating state at the same time, so that gas can enter the collection bottle and discharge the original gas in the collection bottle, avoiding the mixing of the gas to be detected with the original gas after entering, causing errors in the detection results, and improving the accuracy of gas detection.

[0023] 3. By setting up the negative pressure component, during the process of synchronously opening the first sealing component, the second sealing component and the exhaust component, negative pressure can be generated inside the ventilation tube, and the gas to be detected can be introduced into the ventilation tube, so that the gas to be detected can smoothly enter the collection bottle, thereby improving the collection efficiency of the collection bottle for the gas to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the flow meter volume corrector and sampling mechanism of the present invention;

[0025] Figure 2 It is a partial cross-sectional structural schematic diagram of the flow meter volume corrector and sampling mechanism of the present invention;

[0026] Figure 3 It is a front cross-sectional enlarged structural schematic diagram of the sampling mechanism of the present invention;

[0027] Figure 4 It is a schematic diagram of the overall three-dimensional structure of the sampling mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the overall structure of the rotating assembly of the present invention;

[0029] Figure 6 It is a schematic diagram of the overall structure of the negative pressure assembly of the present invention;

[0030] Figure 7 is a schematic diagram of the three-dimensional structure of the first sealing component of the present invention;

[0031] Figure 8 is a schematic diagram of the overall structure of the second sealing assembly of the present invention;

[0032] Fig. 9 It is a schematic diagram of the overall structure of the pushing assembly of the present invention;

[0033] Fig.10 It is a schematic diagram of the overall structure of the exhaust assembly of the present invention;

[0034] Fig.11 It is a schematic diagram of the three-dimensional structure inside the flow meter volume corrector of the present invention;

[0035] Fig.12 It is a schematic diagram of the overall structure of the pressing assembly of the present invention.

[0036] In the figure:

[0037] 1. Flow meter volume corrector; 11. Ventilation pipe; 12. Sliding rod; 13. Flow meter base; 14. Pressure sensor; 15. Temperature sensor; 16. Flow sensor; 17. Baffle; 2. Collection bottle; 3. Rotating assembly; 31. Rotating groove; 32. Sealing ring; 33. Push rod; 34. Connecting rod; 35. Rotating plate; 36. Arc groove; 37. Through hole; 4. Negative pressure assembly; 41. Extrusion rod; 42. Negative pressure plate; 43. Extrusion block; 44. Limit strip; 5. First sealing assembly; 51. Collection port; 52. Baffle; 53. Ventilation hole; 54. Stop ball; 55. Pressure strip; 56. Extrusion groove ; 57. Extrusion piece; 58. Extrusion column; 6. Second sealing component; 61. Sealing plate; 62. Extrusion hole; 63. Compression piece; 64. Abutment plate; 65. Air inlet hole; 7. Pushing component; 71. Pushing rod; 72. Pressing rod; 73. Extrusion inclined hole; 8. Exhaust component; 81. Fixed plate; 82. Exhaust piece; 83. Pressing plate; 84. Exhaust hole; 85. Pressing rod; 86. Exhaust plate; 9. Explosion-proof shell; 91. Transmitting antenna; 92. Touch screen; 93. Explosion-proof glass; 10. Pressing component; 101. Pressing column; 102. Soft pressure block; 103. Sliding column; 104. Pressing spring. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] Example 1, reference Figure 1-Figure 5, which is the first embodiment of the present invention, provides a sampling mechanism based on gas detection, including a flow meter volume corrector 1, a flow meter base 13 installed at the bottom of the flow meter volume corrector 1, a ventilation pipe 11 installed on one side of the top of the flow meter base 13, a baffle 17 installed on one side of the bottom of the ventilation pipe 11, and the bottom of the baffle 17 extends into the flow meter base 13, the baffle 17 is in a concave and inclined shape, a sliding rod 12 fixedly connected to the top of the inner cavity of the ventilation pipe 11, a pressure sensor 14 installed at the top of the inner cavity of the flow meter base 13, a temperature sensor 15 installed on one side of the pressure sensor 14, and a flow sensor 16 installed at the bottom of the inner cavity of the flow meter base 13, and also includes a sampling mechanism installed on one side of the middle part of the ventilation pipe 11; the sampling mechanism includes a collection bottle 2 threadedly installed on one side of the middle part of the ventilation pipe 11, a sealing component installed at the bottle mouth of the collection bottle 2, an exhaust component installed on one side of the bottom of the collection bottle 2, and a sampling mechanism installed in the middle of the ventilation pipe 11. The air intake component is used to generate negative pressure inside the vent pipe 11, so that the gas can be sucked into the vent pipe 11, the sealing component is opened after being squeezed by the air intake component, and the negative pressure generated in the vent pipe 11 allows the gas to enter the collection bottle 2, and the exhaust component is used to open the collection bottle 2 when the air is taken in, so that the original gas inside is squeezed out; the air intake component includes a rotating component 3 installed in the middle of the vent pipe 11, and a negative pressure component 4 installed on the top of the rotating component 3; the rotating component 3 includes a rotating groove 31 opened on the tube wall in the middle of the vent pipe 11, a sealing ring 32 rotatably connected in the rotating groove 31, a lever 33 fixedly connected to one side of the sealing ring 32, a connecting rod 34 fixedly connected to the top of the sealing ring 32, a rotating plate 35 fixedly connected to one side of the connecting rod 34, an arc groove 36 opened on one side of the rotating plate 35, and a through hole 37 opened in a ring array on the rotating plate 35, and the middle part of the rotating plate 35 is rotatably connected to the sliding rod 12.

[0040] Specifically, when the fluid flowing along the axial direction enters the inlet of the flow meter base table 13, the two ends of the flow meter base table 13 are respectively installed with a vortex generator and a de-vortex generator, which are not shown in the figure. The vortex generator forces the fluid to rotate, so a vortex flow is generated in the center of the vortex generator. The vortex flow rotates in the Venturi tube, and suddenly throttles when it reaches the contraction section to accelerate the vortex flow. When the vortex flow enters the diffusion section, it is forced to rotate in a second rotation due to the backflow effect, and begins to rotate twice, forming a gyroscopic vortex precession phenomenon. The vortex precession frequency is proportional to the medium flow rate, and good linearity is obtained in a wide flow range. The weak charge signal detected by the flow sensor 16 is differentially amplified, filtered and shaped to obtain a pulse signal with a frequency proportional to the flow rate, and then the microprocessor calculates and processes it together with the detection values ​​of the temperature sensor 15 and the pressure sensor 14 to obtain the working condition and standard condition volume flow and total amount. This is a prior art and will not be repeated. When collecting gas, the collection bottle 2 is installed on the ventilation pipe 11, and the sealing component at the collection bottle 2 is opened through the air intake component so that the gas can enter the collection bottle 2, and the exhaust component is opened at the same time so that the gas to be detected entering discharges the original gas inside the collection bottle 2. After the collection is completed, the intake component is closed so that the sealing component and the exhaust component are closed at the same time, and the gas to be detected is stored in the collection bottle 2 and removed, thereby realizing the gas collection and facilitating subsequent detection. When the rotating assembly 3 is working, the lever 33 is manually rotated to make the lever 33 drive the sealing ring 32 and the rotating plate 35 to rotate, so that the arc groove 36 on one side of the rotating plate 35 rotates, thereby unlocking the first sealing assembly 5, so that the gas can enter the collection bottle 2. The lever 33 and the connecting rod 34 form an L shape and rotate in the rotating groove 31. The setting of the sealing ring 32 can prevent the lever 33 from causing the gas to be detected in the ventilation pipe 11 to leak out from the rotating groove 31 when the rotating plate 35 is driven to rotate, thereby achieving a sealing effect on the ventilation pipe 11 when the lever 33 is rotated, which is convenient for the subsequent negative pressure assembly 4 to introduce gas. The setting of the baffle plate 17 allows the airflow entering the flow meter base 13 to be guided into the ventilation pipe 11, and then cooperates with the negative pressure assembly 4 to allow the airflow to quickly enter the collection bottle 2.

[0041] Reference Figure 1-Figure 6 The negative pressure assembly 4 includes an extrusion rod 41 fixedly connected to the top of the rotating plate 35, a negative pressure plate 42 slidably connected to the sliding rod 12, an extrusion block 43 fixedly connected to the bottom of the negative pressure plate 42, and the top of the extrusion rod 41 abuts against the bottom of the negative pressure plate 42, and a limit strip 44 symmetrically fixedly connected to both sides of the sliding rod 12, and the middle part of the negative pressure plate 42 is slidably connected to the limit strip 44, and the side wall of the negative pressure plate 42 is sealed and slidably connected to the inner wall of the ventilation pipe 11.

[0042] Specifically, when the lever 33 drives the rotating plate 35 to rotate through the connecting rod 34, the rotating plate 35 drives the squeezing rod 41 to rotate. The rotation of the squeezing rod 41 will slide at the bottom of the squeezing block 43, and the squeezing block 43 is squeezed and limited by the limit strip 44 on the negative pressure plate 42, so that the squeezing block 43 is squeezed in the ventilation pipe 11 and moves upward, so that the gas passing through the flow meter base table 13 is sucked into the ventilation pipe 11, and at this time, due to the rotation of the rotating plate 35, the rotating plate 35 squeezes the first sealing component 5, so that the first sealing component 5 is opened, the first sealing component 5 opens the second sealing component 6, and the second sealing component 6 opens the exhaust component 8, so that the collection bottle 2 is in a circulation state, so that the gas can enter the collection bottle 2 and discharge the original gas in the collection bottle 2, so as to avoid the gas to be detected from mixing with the original gas after entering, causing errors in the detection results, thereby improving the accuracy of gas detection.

[0043] Reference Figure 4-Figure 6 The bottom surface of the extrusion block 43 is spiral, and the top of the extrusion rod 41 is slidably connected to the bottom surface of the extrusion block 43.

[0044] Specifically, the squeezing block 43 is arranged in a spiral shape, so that the squeezing rod 41 can continuously push the negative pressure plate 42 upward when rotating, thereby introducing the gas into the ventilation pipe 11.

[0045] Example 2, reference Figure 1-Figure 7 , is the second embodiment of the present invention, which is different from the first embodiment in that: the sealing component includes a first sealing component 5 installed on the ventilation pipe 11, and a second sealing component 6 installed at the mouth of the collection bottle 2, the first sealing component 5 includes a collection port 51 opened on one side of the middle of the ventilation pipe 11, a baffle 52 fixedly connected to one side of the inside of the collection port 51, one side of the baffle 52 is in a smooth convex shape, a ventilation hole 53 opened in the middle of the baffle 52, a blocking ball 54 abutting against the ventilation hole 53, and one side of the blocking ball 54 abuts against the arc groove 36, a pressure strip 55 fixedly connected to the blocking ball 54 in an annular array, an extrusion groove 56 opened on the side wall of the collection port 51, an extrusion piece 57 fixedly connected to the extrusion groove 56, and one side of the four pressure strips 55 is fixedly connected to the extrusion piece 57, and one side of the four pressure strips 55 is fixedly connected to the extrusion piece 57, and an extrusion column 58 fixedly connected to one side of the blocking ball 54.

[0046] Specifically, the arrangement of the first sealing component 5 and the second sealing component 6 enables the collection bottle 2 and the vent pipe 11 to be sealed after the collection bottle 2 is taken out, thereby ensuring the sealing of the collection bottle 2 and the vent pipe 11 respectively, avoiding the mixing of air, improving the quality of the gas to be detected collected by the collection bottle 2, and avoiding the influence of air entering the vent pipe 11 on the measurement of the flow meter. When working, when the rotating plate 35 rotates, the circular side of the rotating plate 35 will squeeze the blocking ball 54, so that the blocking ball 54 drives the pressure strip 55 to push the extrusion member 57. The extrusion member 57 can be a spring. The extrusion member 57 is compressed, so that the blocking ball 54 no longer abuts against the vent hole 53, so that the gas can flow out through the vent hole 53. At this time, the extrusion column 58 will push the second sealing component 6 to unlock the second sealing component 6.

[0047] Reference Figure 1-Figure 8 The second sealing assembly 6 includes a sealing plate 61 fixedly connected to the mouth of the collection bottle 2, an extrusion hole 62 provided in the middle of the sealing plate 61, a compression groove provided in the mouth of the collection bottle 2, a compression member 63 fixedly connected in the compression groove, the compression member 63 may be a spring, an abutment plate 64 fixedly connected to one side of the compression member 63, and air inlet holes 65 provided in an annular array on the abutment plate 64, and one side of the sealing plate 61 abuts against the abutment plate 64.

[0048] Specifically, the squeezing rod 41 passes through the squeezing hole 62 to push the abutting plate 64, so that the abutting plate 64 is pushed away from the sealing plate 61, so that the gas can enter the collection bottle 2 from the vent hole 53, the squeezing hole 62 and the air inlet hole 65 in turn, so as to squeeze out the original gas inside and collect the gas to be detected. The rest of the structure is the same as that of Example 1.

[0049] Example 3, reference Figure 1-Figure 9 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the exhaust component includes a pushing assembly 7 installed on one side of the abutment plate 64, and an exhaust assembly 8 installed on one side of the pushing assembly 7; the pushing assembly 7 includes a pushing rod 71 fixedly connected to one side of the abutment plate 64, a pressing rod 72 abutting on one side of the pushing rod 71, and an extrusion inclined hole 73 opened at the bottom of the pressing rod 72.

[0050] Specifically, when the abutment plate 64 is pushed away from the sealing plate 61 , the push rod 71 is synchronously pushed and squeezes the squeezing inclined hole 73 at the bottom of the pressing rod 72 , so that the pressing plate is squeezed downward, thereby realizing the opening of the exhaust assembly 8 .

[0051] Reference Fig. 9 The bottom of the extrusion inclined hole 73 is inclined, and one side of the push rod 71 abuts against the bottom of the extrusion inclined hole 73 .

[0052] Specifically, one end of the push rod 71 slides along the bottom of the extrusion inclined hole 73 , so that the pressing rod 72 moves downward, thereby unlocking the exhaust assembly 8 .

[0053] Reference Figure 1-Figure 10 The exhaust assembly 8 includes an exhaust port opened on one side of the bottom of the collection bottle 2, a fixed plate 81 fixedly connected to the bottom of the exhaust port, an exhaust member 82 fixedly connected to the top of the fixed plate 81, the exhaust member 82 can be a spring, a pressing plate 83 fixedly connected to the top of the exhaust member 82, exhaust holes 84 opened in the middle of the fixed plate 81 and the pressing plate 83, a pressing rod 85 fixedly connected to the bottom of the pressing plate 83 and passing through the fixed plate 81 in an annular array, and an exhaust plate 86 fixedly connected to the bottom of the four pressing strips 55, and the bottom of the exhaust plate 86 is fixedly connected to the top of the lower pressure rod 72, and the top of the exhaust plate 86 abuts against the bottom of the fixed plate 81.

[0054] Specifically, when the lower pressing rod 72 moves downward, the exhaust plate 86 will be driven to move downward, so that the exhaust plate 86 is no longer in contact with the fixed plate 81, that is, the exhaust hole 84 is connected to the inside of the collection bottle 2. At this time, the pressing plate 83 is synchronously pulled downward by the pressing rod 85, and the exhaust member 82 is compressed. The exhaust member 82 can be a spring. When the push rod 71 does not squeeze the lower pressing rod 72, the exhaust member 82 returns to its original length, so that the exhaust plate 86 blocks the exhaust hole 84, thereby achieving the sealing effect of the collection bottle 2. When the collection bottle 2 is removed, the gas to be detected inside is tested. , the syringe with the needle removed can be inserted into the exhaust port. When inserted, the injection tube of the syringe is inserted into the exhaust hole 84. When the syringe is inserted, the bottom of the syringe will press down the pressing plate 83, and the pressing plate 83 will press down the exhaust plate 86 away from the exhaust hole 84 through the pressing rod 85, so that the gas to be detected can be extracted. When the gas to be detected is extracted, the bottom of the injection tube will not be squeezed and blocked, and the gas can be extracted smoothly and quickly, thereby improving the detection efficiency of the gas to be detected. The operation is quick and convenient, and it will not affect the sealing of the bottle mouth of the collection bottle 2. The rest of the structure is the same as that of Example 2.

[0055] Example 4, reference Figure 1-Figure 11 , which is the fourth embodiment of the present invention, provides: a flow meter, including a flow meter volume corrector 1, an explosion-proof shell 9 fixedly connected to the flow meter volume corrector 1, a transmitting antenna 91 fixedly connected to the flow meter volume corrector 1, a touch screen 92 installed on one side of the flow meter volume corrector 1, an explosion-proof glass 93 installed on the side of the explosion-proof shell 9 away from the flow meter volume corrector 1, and a pressing component 10 installed between the explosion-proof glass 93 and the touch screen 92.

[0056] Specifically, the explosion-proof shell 9 can improve the explosion-proof performance of the flow meter, the transmitting antenna 91 can transmit the information of the internal processor of the flow meter to the control system, and the pressing component 10 set between the touch screen 92 and the explosion-proof glass 93 can improve the aesthetics and explosion-proof performance, and avoid the use of external contact pressing to affect the sealing performance of the flow meter.

[0057] Reference Figure 1-Figure 12 The pressing assembly 10 includes a pressing column 101 fixedly connected to the bottom of the explosion-proof glass 93, a soft pressing block 102 fixedly connected to the bottom of the pressing column 101, a sliding column 103 fixedly connected to the top of the touch display screen 92, and a pressing spring 104 fixedly connected to the inside of the sliding column 103. The pressing spring 104 is sleeved on the pressing column 101, and the top of the pressing spring 104 is fixedly connected to the bottom of the pressing column 101. The shape of the pressing column 101 is T-shaped. The pressing column 101 slides within the sliding column 103 to prevent the pressing column 101 from sliding out of the sliding column 103.

[0058] Specifically, when pressing, the pressing column 101 is squeezed so that the pressing column 101 drives the soft pressing block 102 at the bottom thereof to press the touch display screen 92 , and the pressing spring 104 is compressed, thereby achieving pressing of the touch display screen 92 .

[0059] In summary, the working principle of the present invention is as follows: when collecting the gas to be detected, the toggle lever is rotated, the toggle lever drives the rotating plate 35 to rotate, the rotating plate 35 drives the squeezing rod 41 to rotate, the squeezing rod 41 pushes the squeezing block 43, and since the squeezing block 43 is limited, the squeezing block 43 pushes the negative pressure plate 42 to move upward in the ventilation pipe 11, and at the same time, the side wall of the rotating plate 35 squeezes and pushes the blocking ball 54, so that the blocking ball 54 is separated from the abutment and blocking of the baffle plate 52, and the blocking ball 54 pushes the squeezing rod 41 pushes the abutment plate 64, so that the abutment plate 64 no longer abuts and blocks the blocking plate. At the same time, one end of the push rod 71 is squeezed on the extrusion inclined hole 73, so that the pressing rod 72 moves downward, so that the exhaust plate 86 is away from the fixed plate 81, so that the gas to be detected is introduced into the collection bottle 2, and the original gas inside the collection bottle 2 is discharged. After the collection is completed, the toggle rod is turned back to its original position, so that the arc groove 36 and the blocking ball 54 abut against each other, thereby ensuring the sealing of the ventilation pipe 11 and the collection bottle 2.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sampling mechanism based on gas detection, comprising a flow meter volume corrector (1), a flow meter base (13) arranged at the bottom of the flow meter volume corrector (1), a ventilation pipe (11) arranged at one side of the top of the flow meter base (13), a baffle (17) arranged at one side of the bottom of the ventilation pipe (11), wherein the bottom of the baffle (17) extends into the flow meter base (13), the baffle (17) is in a concave and inclined shape, a sliding rod (12) arranged at the top of the inner cavity of the ventilation pipe (11), a pressure sensor (14) arranged at the top of the inner cavity of the flow meter base (13), a temperature sensor (15) arranged at one side of the pressure sensor (14), and a flow sensor (16) arranged at the bottom of the inner cavity of the flow meter base (13), characterized in that: It also includes a sampling mechanism arranged on one side of the middle part of the ventilation pipe (11); The sampling mechanism comprises a collection bottle (2) threadedly arranged on one side of the middle of the ventilation tube (11), a sealing component arranged at the mouth of the collection bottle (2), an exhaust component arranged on one side of the bottom of the collection bottle (2), and an air intake component arranged in the middle of the ventilation tube (11); The air intake component is used to generate negative pressure inside the ventilation pipe (11), so that gas is sucked into the ventilation pipe (11); the sealing component opens after being squeezed by the air intake component, and cooperates with the negative pressure generated in the ventilation pipe (11) to allow gas to enter the collection bottle (2); the exhaust component is used to open when the collection bottle (2) is intaken, so that the original gas inside is squeezed and discharged; The air intake component comprises a rotating assembly (3) arranged in the middle of the ventilation pipe (11), and a negative pressure assembly (4) arranged at the top of the rotating assembly (3); the rotating assembly (3) comprises a rotating groove (31) opened on the tube wall in the middle of the ventilation pipe (11), a sealing ring (32) matched and arranged in the rotating groove (31), a lever (33) arranged on one side of the sealing ring (32), a connecting rod (34) arranged on the top of the sealing ring (32), a rotating plate (35) arranged on one side of the connecting rod (34), an arc groove (36) opened on one side of the rotating plate (35), and a ring-shaped array of through holes (37) opened on the rotating plate (35), and the middle part of the rotating plate (35) is rotatably connected to the sliding rod (12); The sealing component comprises a first sealing component (5) arranged on the vent pipe (11), and a second sealing component (6) arranged at the mouth of the collection bottle (2), wherein the first sealing component (5) comprises a collection port (51) opened on one side of the middle of the vent pipe (11), a baffle (52) arranged on one side of the inside of the collection port (51), one side of the baffle (52) being in a smooth convex shape, a vent hole (53) opened in the middle of the baffle (52), a baffle ball (54) arranged in the vent hole (53), one side of the baffle ball (54) being in contact with the arc groove (36), a pressure strip (55) arranged on the baffle ball (54) in an annular array, an extrusion groove (56) opened on the side wall of the collection port (51), an extrusion piece (57) arranged in the extrusion groove (56), one side of the four pressure strips (55) being fixedly connected to the extrusion piece (57), and an extrusion column (58) arranged on one side of the baffle ball (54); The second sealing assembly (6) comprises a sealing plate (61) arranged at the mouth of the collection bottle (2), an extrusion hole (62) provided in the middle of the sealing plate (61), a compression groove provided in the mouth of the collection bottle (2), a compression member (63) provided in the compression groove, an abutment plate (64) provided on one side of the compression member (63), and air inlet holes (65) provided in an annular array on the abutment plate (64), and one side of the sealing plate (61) abuts against the abutment plate (64).

2. The sampling mechanism based on gas detection according to claim 1 is characterized in that: The negative pressure assembly (4) comprises an extrusion rod (41) arranged at the top of the rotating plate (35), a negative pressure plate (42) arranged on the sliding rod (12), an extrusion block (43) arranged at the bottom of the negative pressure plate (42), the top of the extrusion rod (41) abutting against the bottom of the negative pressure plate (42), and limit strips (44) symmetrically arranged on both sides of the sliding rod (12), the middle part of the negative pressure plate (42) is slidably connected to the limit strips (44), and the side wall of the negative pressure plate (42) is sealed and slidably connected to the inner wall of the ventilation pipe (11).

3. The sampling mechanism based on gas detection according to claim 2 is characterized in that: The bottom surface of the extrusion block (43) is spiral-shaped, and the top of the extrusion rod (41) is slidably connected to the bottom surface of the extrusion block (43).

4. The sampling mechanism based on gas detection according to claim 1, characterized in that: The exhaust component comprises a pushing assembly (7) arranged on one side of the abutment plate (64), and an exhaust assembly (8) arranged on one side of the pushing assembly (7); the pushing assembly (7) comprises a pushing rod (71) arranged on one side of the abutment plate (64), a pressing rod (72) arranged on one side of the pushing rod (71), and an extrusion inclined hole (73) opened at the bottom of the pressing rod (72).

5. The sampling mechanism based on gas detection according to claim 4 is characterized in that: The bottom of the extrusion inclined hole (73) is inclined, and one side of the push rod (71) abuts against the bottom of the extrusion inclined hole (73).

6. The gas detection-based sampling mechanism according to claim 4, characterized in that: The exhaust assembly (8) comprises an exhaust port arranged at one side of the bottom of the collection bottle (2), a fixing plate (81) arranged at the bottom of the exhaust port, an exhaust member (82) arranged at the top of the fixing plate (81), a pressing plate (83) arranged at the top of the exhaust member (82), an exhaust hole (84) penetrating through the middle of the fixing plate (81) and the pressing plate (83), a pressing rod (85) arranged in a ring array at the bottom of the pressing plate (83) and penetrating the fixing plate (81), and an exhaust plate (86) arranged at the bottom of the four pressing strips (55), wherein the bottom of the exhaust plate (86) is fixedly connected to the top of the lower pressing rod (72), and the top of the exhaust plate (86) abuts against the bottom of the fixing plate (81).

7. A flow meter, using the sampling mechanism based on gas detection as described in any one of claims 1 to 6, characterized in that: The invention comprises a flow meter volume corrector (1), an explosion-proof housing (9) arranged on the flow meter volume corrector (1), a transmitting antenna (91) arranged on the flow meter volume corrector (1), a touch display screen (92) arranged on one side of the flow meter volume corrector (1), an explosion-proof glass (93) arranged on a side of the explosion-proof housing (9) away from the flow meter volume corrector (1), and a pressing component (10) arranged between the explosion-proof glass (93) and the touch display screen (92).

8. The flow meter according to claim 7, characterized in that: The pressing assembly (10) comprises a pressing column (101) arranged at the bottom of the explosion-proof glass (93), a soft pressing block (102) arranged at the bottom of the pressing column (101), a sliding column (103) arranged at the top of the touch display screen (92), and a pressing spring (104) arranged inside the sliding column (103), wherein the top of the pressing spring (104) is fixedly connected to the bottom of the pressing column (101), and the shape of the pressing column (101) is T-shaped.

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