A detection device for improving the accuracy of low-flow gas measurement in pipelines

Abstract

The present application relates to the technical field of gas detection, and provides a detection device for improving the accuracy of low-flow gas measurement in a pipeline, including a circulation pipeline and a sensor, the circulation pipeline including an inlet section, a connecting section and a detection section, the inlet end of the connecting section is connected to the inlet section, the outlet end of the connecting section is connected to the detection section, the inner diameter of the inlet section is larger than the inner diameter of the detection section; a retaining ring and a mounting ring are sequentially arranged in the detection section, the retaining ring is arranged on the inner circumferential wall of one end of the detection section close to the connecting section, the mounting ring is arranged on the inner circumferential wall of the detection section and is located on the side of the retaining ring away from the connecting section, the sensor is arranged on the mounting ring, and the mounting ring is provided with an adjustment component for changing the position of the sensor. A detection device for improving the accuracy of low-flow gas measurement in a pipeline of the present application can improve the accuracy of gas measurement at low flow rates.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a detection device for improving the accuracy of low-flow-rate gas measurement in a pipeline. Background Art

[0002] A gas sensor is a device that converts information such as the composition and concentration of a gas into information that can be used by personnel, instruments, computers, etc. In some applications, a gas sensor can be used in conjunction with other sensors (such as flow sensors and temperature sensors) to provide more comprehensive measurement data.

[0003] In the prior art, the sensor is usually arranged at the center of the cross section of the pipeline. When the gas to be measured passes through the pipeline, the sensor can measure its parameters such as composition, concentration, flow rate and temperature. However, when the gas is in a low flow rate state, the low flow rate gas cannot fill the entire cross section of the pipeline, resulting in different gas parameters at different positions of the pipeline cross section, which cannot correctly reflect the actual parameters of the gas inside the pipeline; especially for mixed gases (such as a mixture of multiple gases such as oxygen and hydrogen), at low flow rates, gases with different densities in the mixed gas are prone to stratification (gas with high density sinks to the bottom of the pipeline, and gas with low density floats to the top of the pipeline), resulting in the parameters measured by the sensor being too far away from the actual deviation, and losing the reference value, so further improvement is needed. Summary of the invention

[0004] In order to improve the accuracy of gas measurement at low flow rates, the present application provides a detection device for improving the accuracy of gas measurement at low flow rates in pipelines.

[0005] The present application provides a detection device for improving the accuracy of low-flow gas measurement in a pipeline, which adopts the following technical solutions:

[0006] A detection device for improving the accuracy of low-flow-rate gas measurement in a pipeline, comprising a circulation pipeline and a sensor, wherein the circulation pipeline comprises an inlet section, a connecting section and a detecting section, wherein the inlet end of the connecting section is connected to the inlet section, the outlet end of the connecting section is connected to the detecting section, and the inner diameter of the inlet section is larger than the inner diameter of the detecting section; a retaining ring and a mounting ring are sequentially arranged in the detecting section, wherein the retaining ring is arranged on the inner peripheral wall of one end of the detecting section close to the connecting section, and the mounting ring is arranged on the inner peripheral wall of the detecting section and is located on the side of the retaining ring away from the connecting section, wherein the sensor is arranged on the mounting ring, and the mounting ring is provided with an adjustment component for changing the position of the sensor.

[0007] By adopting the above technical solution, through the setting of the retaining ring and the adjusting component, after the gas enters the detection section from the inlet section and the connecting section in turn, the sensor in the detection section can detect various parameters of the gas. For low-flow gas, according to the actual situation, the position of the sensor is adjusted by the adjusting component, so that the sensor detects the gas at different positions in the pipeline. The sensor performs multi-point detection and then takes the average value to improve the accuracy of measuring various gas parameters at low flow rates. For low-flow mixed gas, when the mixed gas passes through the connecting section, the pipe diameter is reduced, which speeds up the mixed gas to a certain extent. The mixed gas passes over the retaining ring, and the retaining ring changes the flow path (cross section) of the mixed gas, so that the mixed gas is mixed between the retaining ring and the mounting ring, slowing down the speed of stratification between gases with different densities in the mixed gas, thereby improving the detection accuracy of various gas parameters.

[0008] Optionally, a lifting bar is provided in the mounting ring, and both ends of the lifting bar are extended in the height direction; the adjustment assembly includes a lifting seat, a rotating rod, a first connecting rod, a second connecting rod and a driving member, the lifting seat is slidably installed on the lifting bar, and the sensor is installed on the lifting seat; the rotating rod is rotatably connected to the mounting ring, one end of the first connecting rod is connected to the rotating rod, one end of the second connecting rod is hinged to the lifting seat, and the other end is hinged to an end of the first connecting rod away from the rotating rod; the driving member is provided on the mounting ring to drive the rotating rod to rotate.

[0009] By adopting the above technical solution, through the arrangement of the lifting seat, the rotating rod, the first connecting rod, the second connecting rod and the driving member, when adjusting the position of the sensor, the driving member drives the rotating rod to rotate, and the rotating rod pulls or pushes the second connecting rod through the first connecting rod, thereby forcing the lifting seat to be lifted and lowered along the length direction of the lifting bar to change the position of the sensor, so that the sensor can perform multi-point detection and improve the detection accuracy of gas.

[0010] Optionally, the adjustment assembly includes a rotating ring, a sliding seat, a rotating member and a sliding member, the rotating ring is rotatably connected to the mounting ring, a sliding bar is arranged inside the rotating ring, both ends of the sliding bar are extended along the radial direction of the rotating ring, and both ends of the sliding bar are connected to the inner circumferential wall of the rotating ring; the sliding seat is slidably installed on the sliding bar, and the sensor is installed on the sliding seat; the rotating member is arranged between the mounting ring and the rotating ring to drive the rotating ring to rotate, and the sliding member is arranged between the mounting ring and the sliding seat to drive the sliding seat to slide.

[0011] By adopting the above technical solution, through the rotating ring, the sliding seat, the rotating member and the sliding member, the rotating member can drive the rotating ring to rotate, and the sliding member can drive the sliding seat to slide along the length direction of the sliding bar. The cooperation between the rotating ring and the sliding bar enables the sensor to rotate through the rotating ring and move linearly through the sliding bar, which greatly improves the range of change of the sensor position, enables the sensor to detect gas at different positions in the pipeline, and thus improves the detection accuracy.

[0012] Optionally, the rotating member includes a rotating ring gear, a rotating gear and a driving motor, the rotating ring gear is coaxially arranged on the rotating ring, the rotating gear is rotatably connected to the mounting ring and meshes with the rotating ring gear for transmission; the driving motor is arranged on the mounting ring, and the output shaft of the driving motor is coaxially connected to the rotating gear.

[0013] By adopting the above-mentioned technical solution, through the setting of the rotating ring gear, the rotating gear and the driving motor, the driving motor drives the rotating gear to rotate, and the rotating gear and the rotating ring gear are meshed and transmitted, so that the rotating ring can rotate around its own central axis to change the position of the sensor and increase the range of change of the sensor position.

[0014] Optionally, the sliding member includes a first screw rod, a rotating disk, a pushing block and a pushing column, the first screw rod is rotatably connected to the sliding bar, both ends of the first screw rod are extended along the length direction of the sliding bar, the first screw rod is passed through the sliding seat and is threadedly connected to the sliding seat; the rotating disk is coaxially arranged at one end of the first screw rod, the pushing block is arranged on the outer peripheral wall of the rotating disk, and a plurality of pushing blocks are arranged at intervals around the central axis of the rotating disk; one end of the pushing column is connected to the mounting ring, and when the rotating ring drives the rotating disk to rotate around the central axis of the rotating ring, the pushing column drives the rotating disk to rotate intermittently through the pushing block.

[0015] By adopting the above technical solution, through the first screw rod, rotating disk, pushing block and pushing column, when the rotating ring rotates and drives the rotating disk to rotate to the position of the pushing column, the pushing column pushes the rotating disk through the pushing block, forcing the rotating disk to drive the first screw rod to rotate a certain angle, thereby forcing the sliding seat to move a certain distance; when the rotating ring continues to rotate one circle, the pushing column can push the rotating disk to rotate again (that is, the rotating disk rotates intermittently), so that the sliding seat is displaced a certain distance again, and this is repeated, so that the sensor can intermittently move along the length direction of the sliding bar to change the position of the sensor in the pipeline, thereby improving the convenience of sensor position adjustment.

[0016] Optionally, an avoidance groove is provided on the outer peripheral wall of the rotating ring, the rotating disk is located in the avoidance groove, one end of the first screw rod is inserted into the avoidance groove and is coaxially connected with the rotating disk; an abutment strip is slidably installed on the inner wall of the avoidance groove, and an elastic member is provided between the abutment strip and the inner wall of the avoidance groove, and the elastic member forces the abutment strip to press against the peripheral wall of the first screw rod; the abutment strip is provided with a disengagement member, and when the rotating ring drives the rotating disk to rotate around the central axis of the rotating ring to the position of the pushing column, the disengagement member forces the abutment strip to disengage from the first screw rod.

[0017] By adopting the above-mentioned technical scheme, through the arrangement of the abutment strip and the disengagement member, the abutment strip is normally pressed against the peripheral wall of the first screw rod under the action of the elastic member, thereby limiting the free rotation of the first screw rod and reducing the possibility of free rotation of the first screw rod, thereby determining the position of the sensor on the sliding strip; when the rotating ring drives the rotating disk to rotate around the central axis of the rotating ring to the position of the pushing column, the disengagement member forces the abutment strip to disengage from the first screw rod to release the limit on the first screw rod, and as the rotating ring rotates, the pushing column can push the rotating disk to drive the first screw rod to rotate, thereby adjusting the position of the sensor and improving the stability of the overall structure.

[0018] Optionally, the disengagement member includes a pushing bar and a guide block, the pushing bar is connected to the abutment bar, the guide block is installed on the mounting ring, the guide block has a guide surface, when the rotating ring drives the rotating disk to rotate around the central axis of the rotating ring to the position of the pushing column, the guide block pushes the pushing bar through the guide surface to force the abutment bar to disengage from the first screw rod.

[0019] By adopting the above-mentioned technical solution and setting the pushing bar and the guide block, when the rotating ring drives the rotating disk to rotate around the central axis of the rotating ring to the position of the pushing column, the guide block pushes the pushing bar through the guiding surface, and the pushing bar is connected to the abutment bar, thereby driving the abutment bar to slide to disengage from the first screw rod, thereby improving the operational convenience of the overall structure.

[0020] Optionally, a stirring ring is slidably installed between the mounting ring and the retaining ring, and the outer diameter of the stirring ring is adapted to the inner diameter of the detection section; a linkage assembly is provided between the stirring ring and the rotating ring, and when the rotating ring rotates, the linkage assembly drives the stirring ring to slide back and forth along the central axis of the detection section.

[0021] By adopting the above-mentioned technical scheme and setting the stirring ring and the linkage assembly, for a mixed gas with a low flow rate, due to the slow flow rate, the mixed gas is easier to stratify, the gas with high density in the mixed gas sinks, and the gas with low density floats. Under the action of the linkage assembly, the stirring ring can slide back and forth along the central axis of the detection section, so that the gas retained on the inner wall of the detection section can be stirred, and the gases with different densities can be mixed. At the same time, the possibility of gas retention on the inner wall of the detection section can be reduced to a certain extent.

[0022] Optionally, the linkage assembly includes a second screw rod and a linkage member, one end of the second screw rod is rotatably connected to the mounting ring, the other end passes through the stirring ring and is rotatably connected to the retaining ring, the stirring ring and the second screw rod are threadedly connected, and the second screw rod is a reciprocating screw rod; the linkage member is arranged between the second screw rod and the rotating ring, and when the rotating ring rotates, the linkage member forces the second screw rod to rotate.

[0023] By adopting the above-mentioned technical solution, through the second screw and the linkage member setting, when the rotating ring rotates, the rotating ring forces the second screw to rotate through the linkage member, and the second screw is set as a reciprocating screw, thereby being able to drive the stirring ring to slide back and forth along the central axis of the detection section, thereby improving the operational convenience of the stirring ring displacement.

[0024] Optionally, the inner circumferential wall of the stirring ring is provided with a plurality of diverter notches, and the plurality of diverter notches are arranged at intervals around the central axis of the stirring ring.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Through the setting of the retaining ring and the adjusting component, after the gas enters the detection section from the inlet section and the connecting section in turn, the sensor in the detection section can detect various parameters of the gas. For low-flow gas, according to the actual situation, the position of the sensor is adjusted through the adjusting component, so that the sensor detects the gas at different positions in the pipeline. The sensor performs multi-point detection and then takes the average value to improve the accuracy of measuring various gas parameters at low flow rates. For low-flow mixed gases, when the mixed gas passes through the connecting section, the pipe diameter is reduced, which speeds up the mixed gas to a certain extent. The mixed gas passes over the retaining ring, and the retaining ring changes the flow path (cross-section) of the mixed gas, so that the mixed gas is mixed between the retaining ring and the mounting ring, slowing down the speed of stratification between gases with different densities in the mixed gas, thereby improving the detection accuracy of various gas parameters;

[0027] 2. Through the rotating ring, the sliding seat, the rotating member and the sliding member, the rotating ring can be driven to rotate through the rotating member, and the sliding seat can be driven to slide along the length direction of the sliding bar through the sliding member. The cooperation between the rotating ring and the sliding bar enables the sensor to rotate through the rotating ring and move linearly through the sliding bar, which greatly improves the range of sensor position change, enables the sensor to detect gas at different positions in the pipeline, and thus improves the detection accuracy;

[0028] 3. Through the setting of the stirring ring and the linkage assembly, for the mixed gas with low flow rate, due to the slow flow rate, the mixed gas is easier to stratify, the gas with high density in the mixed gas sinks, and the gas with low density floats. Under the action of the linkage assembly, the stirring ring can slide back and forth along the central axis of the detection section, so that the gas retained on the inner wall of the detection section can be stirred, and the gases with different densities can be mixed. At the same time, the possibility of gas retention on the inner wall of the detection section can be reduced to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of Example 1;

[0030] Figure 2 is a partial cross-sectional view of the retaining ring and the mounting ring of embodiment 1;

[0031] Figure 3 is a schematic diagram of the structure of the adjustment component embodied in Example 1;

[0032] Figure 4 is a schematic diagram of the structure of the regulating component embodied in Example 2;

[0033] Figure 5 is a partial cross-sectional view of a rotating disk according to Embodiment 2;

[0034] Figure 6 yes Figure 4 The enlarged view of point A in the middle;

[0035] Figure 7 is a schematic diagram of the structure of the separation member embodied in Example 3;

[0036] Figure 8 is a partial cross-sectional view of the abutment surface of Embodiment 3;

[0037] Fig. 9 It is a schematic diagram of the structure of the stirring ring according to Embodiment 4.

[0038] Explanation of reference numerals: 1. circulation pipe; 11. inlet section; 12. connection section; 13. detection section; 2. sensor; 3. retaining ring; 4. mounting ring; 41. lifting bar; 42. guide rod; 5. adjustment assembly; 51. lifting seat; 52. rotating rod; 53. first connecting rod; 54. second connecting rod; 55. driving member; 56. rotating ring; 561. sliding bar; 562. avoidance groove; 563. sliding groove; 57. sliding seat; 58. rotating member; 581. rotating gear ring; 582, rotating gear; 583, driving motor; 59, sliding member; 591, first screw rod; 592, rotating disk; 593, pushing block; 594, pushing column; 6, abutment bar; 61, abutment surface; 62, return spring; 7, disengagement member; 71, pushing bar; 711, connecting bar; 72, guide block; 721, guide surface; 8, stirring ring; 81, diversion gap; 9, linkage assembly; 91, second screw rod; 92, linkage gear ring; 93, linkage gear. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 -Attached Fig. 9 This application is described in further detail. Example 1

[0040] The embodiment of the present application discloses a detection device for improving the accuracy of measuring low-flow-rate gas in a pipeline.

[0041] Reference Figure 1 , Figure 2 A detection device for improving the accuracy of low-flow gas measurement in a pipeline, comprising a circulation pipeline 1 and a sensor 2, wherein the circulation pipeline 1 comprises an inlet section 11, a connecting section 12 and a detecting section 13, wherein the inlet end of the connecting section 12 is connected to the inlet section 11, and the outlet end of the connecting section 12 is connected to the detecting section 13; in this embodiment, the inlet section 11 is used to connect the gas outlet end of the device, so that the gas to be detected enters the detecting section 13 from the inlet section 11 and the connecting section 12 in sequence, the inner diameter of the inlet section 11 is larger than the inner diameter of the detecting section 13, and the inner diameter of the connecting section 12 gradually decreases from one end close to the inlet section 11 to one end close to the detecting section 13.

[0042] Reference Figure 2 , Figure 3A retaining ring 3 and a mounting ring 4 are sequentially installed in the detection section 13. In the present embodiment, the retaining ring 3 and the mounting ring 4 are both configured as circular ring plate structures. The retaining ring 3 is fixedly installed on the inner circumferential wall of the detection section 13. The outer circumferential wall of the retaining ring 3 and the inner circumferential wall of the detection section 13 are fixedly connected by welding. The retaining ring 3 is located on the inner circumferential wall of one end of the detection section 13 close to the connecting section 12; the mounting ring 4 is fixedly installed on the inner circumferential wall of the detection section 13. The mounting ring 4 can be detachably installed on the inner circumferential wall of the detection section 13 by bolt connection (the bolt connection is not shown in the figure). The mounting ring 4 is located on the side of the retaining ring 3 away from the connecting section 12.

[0043] Reference Figure 2 , Figure 3 , the sensor 2 is arranged on the mounting ring 4, and the mounting ring 4 is provided with an adjustment component 5 for changing the position of the sensor 2; a lifting bar 41 is installed in the mounting ring 4, and both ends of the lifting bar 41 are extended along the height direction, and both ends of the lifting bar 41 are fixedly connected to the inner circumferential wall of the mounting ring 4; in this embodiment, the adjustment component 5 includes a lifting seat 51, a rotating rod 52, a first connecting rod 53, a second connecting rod 54 and a driving member 55, the lifting seat 51 is slidably installed on the lifting bar 41 so as to be able to rise and fall, the sensor 2 is fixedly installed on the side wall of the lifting seat 51 close to the retaining ring 3, and the sensor 2 is slidably installed on the lifting bar 41 of the mounting ring 4 through the lifting seat 51; it should be noted that the sensor 2 in this embodiment can adopt wireless technology, such as transmitting line signals in the form of wireless radio frequency or Bluetooth.

[0044] Reference Figure 2 , Figure 3 The rotating rod 52 is rotatably connected to the side wall of the mounting ring 4 away from the baffle ring 3, one end of the first connecting rod 53 is fixedly connected to the rotating rod 52, one end of the second connecting rod 54 is hinged to the side wall of the lifting seat 51 away from the baffle ring 3, and the other end of the second connecting rod 54 is hinged to the end of the first connecting rod 53 away from the rotating rod 52; a driving member 55 is arranged on the mounting ring 4 to drive the rotating rod 52 to rotate. The driving member 55 can be a motor or a rotary cylinder. The driving member 55 in this embodiment uses a rotary cylinder. The cylinder body of the rotary cylinder is fixedly installed on the side wall of the mounting ring 4 away from the baffle ring 3, and the output end of the rotary cylinder is connected to the rotating rod 52 to drive the rotating rod 52 to rotate around its own central axis.

[0045] The implementation principle of Example 1 of the present application is as follows: after the gas to be tested enters the detection section 13 from the inlet section 11 and the connection section 12 in sequence, the sensor 2 in the detection section 13 can detect various parameters of the gas. For gas with a low flow rate, according to the actual situation, the driving member 55 drives the rotating rod 52 to rotate, and the rotating rod 52 pulls or pushes the second connecting rod 54 through the first connecting rod 53, thereby forcing the lifting seat 51 to be lifted and lowered along the length direction of the lifting bar 41 to change the position of the sensor 2, so that the sensor 2 can perform multi-point detection, and the sensor 2 performs multi-point detection and then takes the average value to improve the accuracy of measuring various parameters of the gas at a low flow rate.

[0046] For a mixed gas with a low flow rate, when the mixed gas passes through the connecting section 12, the pipe diameter is reduced, which speeds up the mixed gas to a certain extent. The mixed gas passes over the baffle ring 3, and the baffle ring 3 changes the flow path (cross section) of the mixed gas, so that the mixed gas is mixed between the baffle ring 3 and the mounting ring 4, slowing down the speed of stratification between gases with different densities in the mixed gas, thereby improving the detection accuracy of various gas parameters. Example 2

[0047] The embodiment of the present application discloses a detection device for improving the accuracy of measuring low-flow-rate gas in a pipeline.

[0048] Reference Figure 4 , Figure 5 The difference between the detection device for improving the accuracy of low-flow gas measurement in a pipeline disclosed in the embodiment of the present application and embodiment 1 is that:

[0049] In this embodiment, the adjustment assembly 5 includes a rotating ring 56, a sliding seat 57, a rotating member 58 and a sliding member 59. The rotating ring 56 is rotatably installed on the mounting ring 4 and is located on the side of the rotating ring 56 close to the retaining ring 3. The rotating ring 56 is a circular ring structure. The rotating ring 56 and the mounting ring 4 are coaxially arranged so that they can rotate around the central axis of the mounting ring 4; a sliding bar 561 is installed in the rotating ring 56, and both ends of the sliding bar 561 are extended along the radial direction of the rotating ring 56, and both ends of the sliding bar 561 are fixedly connected to the inner circumferential wall of the rotating ring 56.

[0050] Reference Figure 4The sliding seat 57 is slidably installed on the sliding bar 561 so as to be able to slide along the length direction of the sliding bar 561. In this embodiment, the sensor 2 is fixedly installed on the side wall of the sliding seat 57 close to the retaining ring 3; the rotating member 58 is arranged between the mounting ring 4 and the rotating ring 56 to drive the rotating ring 56 to rotate. The rotating member 58 includes a rotating ring gear 581, a rotating gear 582 and a driving motor 583. The rotating ring gear 581 is coaxially fixed to the inner circumferential wall of the rotating ring 56, and the rotating gear 582 is rotatably connected to the mounting ring 4. The rotating gear 582 and the rotating ring gear 581 are meshed for transmission. The driving motor 583 is fixedly installed on the side wall of the mounting ring 4 away from the retaining ring 3, and the output shaft of the driving motor 583 is coaxially connected to the rotating gear 582.

[0051] Reference Figure 4 , Figure 5 , Figure 6 The sliding member 59 is arranged between the mounting ring 4 and the sliding seat 57 to drive the sliding seat 57 to slide. The sliding member 59 includes a first screw rod 591, a rotating disk 592, a pushing block 593 and a pushing column 594. A sliding groove 563 is provided on the side wall of the sliding bar 561 close to the retaining ring 3. Both ends of the sliding groove 563 are extended along the length direction of the sliding bar 561. The first screw rod 591 is rotatably installed in the sliding groove 563. Both ends of the first screw rod 591 are extended along the length direction of the sliding bar 561. The sliding seat 57 is fixedly installed with a sliding block, and the sliding block is slidably installed in the sliding groove 563. The first screw rod 591 is penetrated by the sliding block of the sliding seat 57 and is threadedly connected with the sliding block of the sliding seat 57. In this embodiment, the first screw rod 591 is set as a reciprocating screw rod (the thread of the first screw rod 591 is not shown in the figure).

[0052] Reference Figure 5 , Figure 6 An avoidance groove 562 is provided on the outer peripheral wall of the rotating ring 56, and the rotating disk 592 is located in the avoidance groove 562. One end of the first screw rod 591 penetrates the avoidance groove 562 and is fixed coaxially with the rotating disk 592; a plurality of pushing blocks 593 are provided, and the plurality of pushing blocks 593 are fixedly installed on the outer peripheral wall of the rotating disk 592. The plurality of pushing blocks 593 are arranged at intervals around the central axis of the rotating disk 592, and the rotating disk 592 and the plurality of pushing blocks 593 are integrally formed; one end of the pushing column 594 is fixedly connected to the side wall installed near the retaining ring 3. When the rotating ring 56 drives the rotating disk 592 to rotate around the central axis of the rotating ring 56, the pushing column 594 pushes the rotating disk 592 to rotate intermittently through the pushing block 593.

[0053] The implementation principle of Example 2 of the present application is: driving the rotating ring 56 to rotate, so as to drive the sensor 2 to rotate around the central axis of the rotating ring 56, and at the same time, it can drive the rotating disk 592 to rotate around the central axis of the rotating ring 56. Every time the rotating ring 56 rotates one circle, the pushing column 594 can push the rotating disk 592 once through the pushing block 593, forcing the rotating disk 592 to drive the first screw rod 591 to rotate a certain angle, thereby forcing the sliding seat 57 to move a certain distance; when the rotating ring 56 continues to rotate one circle, the pushing column 594 can push the rotating disk 592 to rotate again (that is, the rotating disk 592 rotates intermittently), so that the sliding seat 57 is displaced a certain distance again, and this is repeated, so that the sensor 2 can intermittently move along the length direction of the sliding bar 561 to change the position of the sensor 2 in the pipeline.

[0054] The cooperation between the rotating ring 56 and the sliding bar 561 enables the sensor 2 to rotate through the rotating ring 56 and to move linearly through the sliding bar 561, which greatly improves the range of change of the position of the sensor 2, allowing the sensor 2 to detect gas at different positions in the pipeline, thereby improving the detection accuracy. Example 3

[0055] The embodiment of the present application discloses a detection device for improving the accuracy of measuring low-flow-rate gas in a pipeline.

[0056] Reference Figure 7 , Figure 8 The difference between the detection device for improving the accuracy of low-flow gas measurement in a pipeline disclosed in the embodiment of the present application and embodiment 2 is that:

[0057] In this embodiment, an abutment bar 6 is provided in the avoidance groove 562. The abutment bar 6 is slidably installed on the inner wall of the avoidance groove 562 so as to be able to approach or move away from the mounting ring 4. The side wall of the abutment bar 6 close to the mounting ring 4 has an abutment surface 61, and the abutment surface 61 is an arc-shaped surface. When the abutment bar 6 moves toward the side close to the mounting ring 4, the abutment surface 61 of the abutment bar 6 abuts against the peripheral wall of the first screw rod 591. When the abutment bar 6 moves toward the side away from the mounting ring 4, the abutment surface 61 of the abutment bar 6 is separated from the first screw rod 591.

[0058] Reference Figure 7 , Figure 8 An elastic member is provided between the abutment strip 6 and the inner wall of the avoidance groove 562. In the present embodiment, the elastic member is configured as a reset spring 62. One end of the reset spring 62 is fixedly connected to the inner wall of the avoidance groove 562, and the other end is fixedly connected to the abutment strip 6. The reset spring 62 normally forces the abutment surface 61 of the abutment strip 6 to abut against the peripheral wall of the first screw rod 591. The abutment strip 6 is provided with a disengagement member 7. When the rotating ring 56 drives the rotating disk 592 to rotate around the central axis of the rotating ring 56 to the position of the pushing column 594, the disengagement member 7 forces the abutment strip 6 to disengage from the first screw rod 591.

[0059] Reference Figure 7 , Figure 8 The disengagement member 7 includes a pushing bar 71 and a guide block 72. The pushing bar 71 is located on a side of the abutting bar 6 close to the mounting ring 4. Both ends of the pushing bar 71 are connected to connecting bars 711. One end of the connecting bar 711 is connected to the pushing bar 71, and the other end is connected to the abutting bar 6. The pushing bar 71 and the abutting bar 6 are connected as a whole through the two connecting bars 711; the pushing bar 71, the abutting bar 6 and the two connecting bars 711 are combined to form a rectangular frame structure, and the first screw rod 591 is penetrated through the area formed by the pushing bar 71, the abutting bar 6 and the two connecting bars 711; the guide block 72 is fixedly installed on the side wall of the mounting ring 4 close to the retaining ring 3, and the guide block 72 has a guide surface 721. When the rotating ring 56 drives the rotating disk 592 to rotate around the central axis of the rotating ring 56 to the position of the pushing column 594, the guide block 72 pushes the pushing bar 71 through the guide surface 721 to force the abutting bar 6 to disengage from the first screw rod 591.

[0060] The implementation principle of Example 3 of the present application is as follows: under normal conditions, the abutment bar 6 is pressed against the peripheral wall of the first screw rod 591, and there is friction between the abutment bar 6 and the first screw rod 591, which limits the free rotation of the first screw rod 591. When the rotating ring 56 drives the rotating disk 592 to rotate around the central axis of the rotating ring 56 to the position of the pushing column 594, the guide block 72 pushes the pushing bar 71 through the guiding surface 721, thereby driving the abutment bar 6 to slide and disengage from the first screw rod 591. As the rotating ring 56 rotates, the pushing column 594 can push the rotating disk 592 to drive the first screw rod 591 to rotate, thereby adjusting the position of the sensor 2 and improving the stability of the overall structure. Example 4

[0061] The embodiment of the present application discloses a detection device for improving the accuracy of measuring low-flow-rate gas in a pipeline.

[0062] Reference Fig. 9 The difference between the detection device for improving the accuracy of low-flow gas measurement in a pipeline disclosed in the embodiment of the present application and embodiment 2 is that:

[0063] In this embodiment, a stirring ring 8 is slidably installed between the mounting ring 4 and the retaining ring 3. The stirring ring 8 is arranged in a ring shape. The outer diameter of the stirring ring 8 is matched with the inner diameter of the detection section 13, and the stirring ring 8 and the retaining ring 3 are coaxially arranged; a plurality of guide rods 42 are installed between the mounting ring 4 and the retaining ring 3, one end of the guide rod 42 is fixedly connected to the mounting ring 4, and the other end is fixedly connected to the retaining ring 3, and the plurality of guide rods 42 are all penetrated by the stirring ring 8, and the stirring ring 8 is slidably installed between the mounting ring 4 and the retaining ring 3 through the plurality of guide rods 42; a plurality of diversion notches 81 for diverting gas are opened on the inner peripheral wall of the stirring ring 8, and the plurality of diversion notches 81 are arranged at intervals around the central axis of the stirring ring 8.

[0064] Reference Fig. 9 A linkage assembly 9 is provided between the stirring ring 8 and the rotating ring 56. When the rotating ring 56 rotates, the linkage assembly 9 drives the stirring ring 8 to slide back and forth along the central axis of the detection section 13; the linkage assembly 9 includes a second screw rod 91 and a linkage member. One end of the second screw rod 91 is rotatably connected to the mounting ring 4, and the other end passes through the stirring ring 8 and is rotatably connected to the retaining ring 3. The stirring ring 8 and the second screw rod 91 are threadedly connected, and the second screw rod 91 is a reciprocating screw rod (the thread of the second screw rod 91 is not shown in the figure).

[0065] Reference Fig. 9 The linkage member is arranged between the second screw rod 91 and the rotating ring 56. When the rotating ring 56 rotates, the linkage member forces the second screw rod 91 to rotate; the linkage member includes a linkage gear ring 92 and a linkage gear 93. The linkage gear ring 92 is coaxially fixed to the side wall of the rotating ring 56 close to the retaining ring 3, and the linkage gear 93 is coaxially fixed to the outer peripheral wall of one end of the second screw rod 91 close to the mounting ring 4. The linkage gear ring 92 and the linkage gear 93 are meshed for transmission.

[0066] The implementation principle of Example 4 of the present application is as follows: for a mixed gas with a low flow rate, due to the slow flow rate, the mixed gas is more likely to be stratified (the gas with high density in the mixed gas sinks, and the gas with low density floats), and is easily retained on the inner wall of the detection section 13 and unable to flow out. Therefore, by driving the stirring ring 8 to slide back and forth along the central axis of the detection section 13, the gas retained on the inner wall of the detection section 13 can be stirred to mix gases with different densities. At the same time, the possibility of gas retention on the inner wall of the detection section 13 can be reduced to a certain extent.

[0067] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A detection device for improving the accuracy of low-flow gas measurement in a pipeline, characterized in that: The invention comprises a circulation pipeline (1) and a sensor (2), wherein the circulation pipeline (1) comprises an inlet section (11), a connecting section (12) and a detection section (13), wherein the inlet end of the connecting section (12) is connected to the inlet section (11), and the outlet end of the connecting section (12) is connected to the detection section (13), and the inner diameter of the inlet section (11) is larger than the inner diameter of the detection section (13); a retaining ring (3) and a mounting ring (4) are sequentially arranged in the detection section (13), wherein the retaining ring (3) is arranged on the inner peripheral wall of one end of the detection section (13) close to the connecting section (12), and the mounting ring (4) is arranged on the inner peripheral wall of the detection section (13) and is located on the side of the retaining ring (3) away from the connecting section (12). The sensor (2) is arranged on a mounting ring (4), and the mounting ring (4) is provided with an adjustment component (5) for changing the position of the sensor (2); the adjustment component (5) comprises a rotating ring (56), a sliding seat (57), a rotating member (58) and a sliding member (59); the rotating ring (56) is rotatably connected to the mounting ring (4); a sliding bar (561) is arranged inside the rotating ring (56); both ends of the sliding bar (561) are extended along the radial direction of the rotating ring (56), and both ends of the sliding bar (561) are connected to the inner peripheral wall of the rotating ring (56); the sliding seat (57) is slidably mounted on the sliding bar (561), and the sensor (2) is mounted on the sliding seat (5 7); the rotating member (58) is arranged between the mounting ring (4) and the rotating ring (56) to drive the rotating ring (56) to rotate; the sliding member (59) is arranged between the mounting ring (4) and the sliding seat (57) to drive the sliding seat (57) to slide; the rotating member (58) comprises a rotating ring gear (581), a rotating gear (582) and a driving motor (583); the rotating ring gear (581) is coaxially arranged on the rotating ring (56); the rotating gear (582) is rotatably connected to the mounting ring (4) and meshes with the rotating ring gear (581) for transmission; the driving motor (583) is arranged on the mounting ring (4); the output shaft of the driving motor (583) is coaxially connected to the rotating ring (56); connected to the rotating gear (582); the sliding member (59) comprises a first screw rod (591), a rotating disk (592), a pushing block (593) and a pushing column (594); the first screw rod (591) is rotatably connected to the sliding bar (561); both ends of the first screw rod (591) are extended along the length direction of the sliding bar (561); the first screw rod (591) is penetrated by the sliding seat (57) and is threadedly connected to the sliding seat (57); the rotating disk (592) is coaxially arranged at one end of the first screw rod (591); the pushing block (593) is arranged on the outer peripheral wall of the rotating disk (592), and a plurality of pushing blocks (593) are arranged at intervals around the central axis of the rotating disk (592);One end of the push column (594) is connected to the mounting ring (4), and when the rotating ring (56) drives the rotating disk (592) to rotate around the central axis of the rotating ring (56), the push column (594) pushes the rotating disk (592) to rotate intermittently through the pushing block (593).

2. A detection device for improving the accuracy of low-flow gas measurement in a pipeline according to claim 1, characterized in that: The outer peripheral wall of the rotating ring (56) is provided with an avoidance groove (562), the rotating disk (592) is located in the avoidance groove (562), one end of the first screw rod (591) penetrates into the avoidance groove (562) and is coaxially connected to the rotating disk (592); an abutment strip (6) is slidably installed on the inner wall of the avoidance groove (562), an elastic member is provided between the abutment strip (6) and the inner wall of the avoidance groove (562), and the elastic member forces the abutment strip (6) to press against the peripheral wall of the first screw rod (591); the abutment strip (6) is provided with a disengagement member (7), and when the rotating ring (56) drives the rotating disk (592) to rotate around the central axis of the rotating ring (56) to the position of the pushing column (594), the disengagement member (7) forces the abutment strip (6) to disengage from the first screw rod (591).

3. A detection device for improving the accuracy of low-flow gas measurement in a pipeline according to claim 2, characterized in that: The disengagement member (7) comprises a pushing bar (71) and a guiding block (72), wherein the pushing bar (71) is connected to the abutting bar (6), and the guiding block (72) is mounted on the mounting ring (4). The guiding block (72) has a guiding surface (721). When the rotating ring (56) drives the rotating disk (592) to rotate around the central axis of the rotating ring (56) to the position of the pushing column (594), the guiding block (72) pushes the pushing bar (71) via the guiding surface (721) to force the abutting bar (6) to disengage from the first screw rod (591).

4. A detection device for improving the accuracy of low-flow gas measurement in a pipeline according to claim 1, characterized in that: A stirring ring (8) is slidably mounted between the mounting ring (4) and the retaining ring (3), and the outer diameter of the stirring ring (8) is matched with the inner diameter of the detection section (13); a linkage assembly (9) is provided between the stirring ring (8) and the rotating ring (56), and when the rotating ring (56) rotates, the linkage assembly (9) drives the stirring ring (8) to slide back and forth along the central axis of the detection section (13).

5. A detection device for improving the accuracy of low-flow gas measurement in a pipeline according to claim 4, characterized in that: The linkage assembly (9) comprises a second screw rod (91) and a linkage member. One end of the second screw rod (91) is rotatably connected to the mounting ring (4), and the other end passes through the stirring ring (8) and is rotatably connected to the retaining ring (3). The stirring ring (8) and the second screw rod (91) are threadedly connected. The second screw rod (91) is a reciprocating screw rod. The linkage member is arranged between the second screw rod (91) and the rotating ring (56). When the rotating ring (56) rotates, the linkage member forces the second screw rod (91) to rotate.

6. A detection device for improving the accuracy of low-flow gas measurement in a pipeline according to claim 4, characterized in that: The inner peripheral wall of the stirring ring (8) is provided with a plurality of flow diversion notches (81), and the plurality of flow diversion notches (81) are arranged at intervals around the central axis of the stirring ring (8).

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