CN117073781B - Large-section pipeline carbon dioxide flow accurate measurement equipment based on balance method - Google Patents
Large-section pipeline carbon dioxide flow accurate measurement equipment based on balance method Download PDFInfo
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- CN117073781B CN117073781B CN202311022421.XA CN202311022421A CN117073781B CN 117073781 B CN117073781 B CN 117073781B CN 202311022421 A CN202311022421 A CN 202311022421A CN 117073781 B CN117073781 B CN 117073781B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 35
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005259 measurement Methods 0.000 title claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 139
- 238000001514 detection method Methods 0.000 claims abstract description 70
- 230000000903 blocking effect Effects 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 4
- 230000008859 change Effects 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 105
- 238000013461 design Methods 0.000 description 19
- 230000033001 locomotion Effects 0.000 description 18
- 230000005540 biological transmission Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000003920 environmental process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to the field of environmental protection monitoring, in particular to a balance method-based large-section pipeline carbon dioxide flow accurate measurement device which comprises a pipe body, a bracket, an extension mechanism, a detection mechanism and a control mechanism, wherein the pipe body is provided with a plurality of measuring units; the pipe body is a large-section metal pipe, the bracket is fixedly connected with the coaxial center of the pipe body, the bracket and the pipe body keep the same axis, the extension mechanism is hinged in the bracket, and the extension mechanism is hinged in the bracket; the detection mechanism is fixedly connected to one side of the extension mechanism; the detection mechanism is electrically connected with the control mechanism; the invention realizes the control and adjustment of the gas circulation position by arranging the staggered blocking effect between the splice plates, so that the gas can be stably transmitted in the detection area, and under the conditions of high concentration and high flow, the mechanism can prevent the gas from diffusing and ensure the gas to flow intensively in the required area, thereby being capable of accurately capturing and analyzing the target gas and improving the accuracy and reliability of detection.
Description
Technical Field
The invention relates to the field of environmental protection monitoring, in particular to a large-section pipeline carbon dioxide flow accurate measurement device based on a balance method.
Background
The device for measuring the carbon dioxide flow of the large-section pipeline is mainly a gas mass flowmeter based on a mass flow measurement principle, and the flowmeter generally uses a sensor to measure the gas mass flow and obtains an accurate carbon dioxide flow value through data processing and calculation.
In the fields of petrochemical industry, power plants, steel industry, environmental protection facilities and the like, the main purpose of carbon dioxide flow measurement is to monitor and control the flow of carbon dioxide in the environmental process, so that the stability of the production process is ensured, the environmental pollution is controlled, and the utilization rate of resources is improved; measuring the flow of carbon dioxide based on the balance method is a common measuring method, and mainly uses a weighing device to measure the mass flow of gas by passing fluid through a pipeline, namely, when the fluid passes through the pipeline, the pressure generated by the fluid passing through the pipeline is the mass, the mass can cause the weight of the balance to change, and the mass flow of gas can be calculated by measuring the weight change.
The flow rate measuring device is a device for direct measurement, does not depend on calculation or estimation of other parameters, has higher precision and stability, and can provide accurate flow rate data; however, measuring carbon dioxide flow based on the balance method requires the use of a precise weighing device due to the complexity and cost of equipment, so that the cost of equipment and a system is relatively high; more importantly, since the gas is used as a medium for instability, unstable turbulence is liable to occur when the flow rate increases, and once the device vibrates due to the increase of the flow rate or turbulence of the gas occurs, the accuracy of the device is greatly affected.
In order to solve the problems, the stability of the balance method in the measuring process is ensured to meet wider application requirements, and the invention provides a large-section pipeline carbon dioxide flow accurate measuring device based on the balance method to solve the problems.
Disclosure of Invention
The invention aims to solve the technical problems that: the measuring equipment is large in pipeline area with large cross section in the measuring process, along with the increase of the carbon dioxide flow velocity in the pipeline, the position detected by the equipment is used as a fixed detection point, on one hand, gas passes through other positions due to the problem of flow velocity, so that measured data is influenced, and on the other hand, the problem of unstable vibration can occur due to the change of pressure caused by the flow velocity of the gas.
In order to solve the technical problems, the invention adopts the following technical scheme: the device comprises a tube body, a bracket, an extending mechanism, a detecting mechanism and a control mechanism; the pipe body is a large-section metal pipe, the pipe has a larger section area and is used for transmitting fluid or gas, the support is fixedly connected with the pipe body in a coaxial center, the support and the pipe body keep the same axis so as to ensure stable connection, the extension mechanism is hinged inside the support so as to realize partial movement, and the extension mechanism passes through a gap between the pipe body and the detection mechanism through gas, so that the extension mechanism is pushed by air pressure difference generated by Bernoulli principle; the extension mechanism may be pushed or pulled by a speed difference and a pressure difference formed between the tube body and the detection mechanism by using gas; the detection mechanism is fixedly connected to one side of the extension mechanism, is fixed to one side of the extension mechanism so as to be tightly matched with the extension mechanism, analyzes and measures mass change in the carbon dioxide moving process by utilizing the mass conservation law based on the mass conservation law, and can monitor and record the mass change condition of the carbon dioxide.
The detection mechanism can rotate by the impact force of the current carbon dioxide on the unit section of the pipeline so as to change the angle of gas impact; the detection mechanism can adjust the position of the pipeline unit section according to the impact force applied by the current carbon dioxide to the pipeline unit section, so that the direction or angle of gas impact is changed; the detection mechanism is electrically connected with the control mechanism, the detection mechanism is in communication and data transmission with the control mechanism through the electrical connection, and the detection mechanism can transmit the measured carbon dioxide data to the control mechanism through the electrical connection so as to perform further analysis and control operation.
The extension mechanism comprises a shell, a piston, a spiral spring, a rotating shaft, a splice plate and a connecting rod, wherein the shell is a rectangular cavity, a circular opening is formed in the edge of the shell, the circular opening extends inwards along the edge of the shell to form a cylindrical channel, the piston is connected in the cylindrical channel in a sliding manner, the diameter of the piston is identical to the inner diameter of the cylindrical channel, the roughness in the cylindrical channel is smaller than 1um, the piston can be free to move under the action of pressure under the influence of Bernoulli principle, and the friction force influence when the piston moves in the cylindrical channel is very little due to the limitation of friction force.
The rotary shaft is positioned at the center line of the shell and extends outwards to form the cylindrical bulge, the diameter ratio of the cylindrical bulge to the diameter of the cylindrical channel is 1:2, the design can increase the stability of the rotary shaft, the spiral spring is positioned inside the rotary shaft and is used for providing a return acting force when the rotary shaft rotates due to pressure change, and when the external air pressure is recovered, the spiral spring can enable the rotary shaft to return to the original position, so that the piston is retracted to the initial position.
The piston is fixedly connected with the splice plate through the connecting rod at the near outer side, so that when the rotating shaft rotates, the movement of the piston drives the connecting rod to move outwards, so that the splice plate extends out, and through the mechanism design, the piston can move in the rotating process of the rotating shaft and is transferred to the splice plate, so that the required function or operation is realized.
Preferably, the splice plate is fixedly connected with the piston at one end portion thereof through the connecting rod, and is fixedly connected with the supporting column at the other end portion thereof, so that in the moving process of the piston, the two rectangular air holes of the splice plate are attached to each other by the driving of the connecting rod, once the movement occurs, the rectangular air holes on the adjacent splice plates are mutually blocked, an area which does not allow gas to pass through is formed between the plates, and only the gas passage allows the gas to pass through, therefore, under the conditions of higher gas concentration and larger flow, the gas passage can be stably kept in the detection area, thereby improving the detection efficiency and the precision.
The design realizes the control and adjustment of the gas channel through the blocking effect between the splice plates, so that the gas can be stably transferred in a detection area, and under the conditions of high concentration and high flow, the mechanism can prevent the gas from leaking or diffusing, ensure the gas to flow intensively in a required area, and further improve the accuracy and reliability of detection.
It is to be added that, the both sides of the axis of rotation the protruding outward flange of cylindricality all is provided with opposite screw thread, through setting up opposite screw thread, can satisfy following requirement: when the flow rate of the external air increases on one side, the piston moves outwards along the cylindrical channel, and the rotating shaft starts to rotate, so that the piston on the other side is driven to move outwards, and the extension of the splice plates on two sides of the extension mechanism is realized.
The piston is connected with the rotating shaft through the screw thread, the screw thread length of the columnar bulge is half of the length of the columnar bulge, and the purpose of the design is to control the moving range of the piston so as to ensure good attaching effect between the splice plates and realize effective airtight isolation; a blocking area of 0.5 cm to 1cm is arranged on the side of the thread near the outer end of the cylindrical bulge, and the blocking area is used for preventing the piston from sliding or falling off when the gas flow rate is increased, and simultaneously, the blocking area also limits the maximum position of the piston to move; through such design, can ensure extending mechanism's normal operating, opposite the screw thread structure with the setting of separation district can guarantee the stable removal of piston to prevent that gas leakage or laminating effect between the splice plate is not good the problem emergence.
The support comprises an inner ring and an outer ring, the diameter of the outer ring is the same as the inner diameter of the pipe body, the diameter ratio of the inner ring to the diameter of the outer ring is 2:3, the inner ring and the outer ring are fixedly connected through support columns, the extension mechanisms are arranged in an annular array mode around the central axis of the support, 12-18 extension mechanisms are arranged around the central axis of the support in the annular array mode, 12-18 support columns are also arranged, the extension mechanisms are located between the outer ring and the inner ring, two adjacent extension mechanisms are fixedly connected through one support column, the support columns are fixedly connected at the right central position of the extension mechanisms, and the length of the extension mechanisms is the same as the distance between the outer ring and the inner ring.
Such a bracket design provides a stable structural support and enables the extension mechanism to be evenly distributed around the bracket, with a firm connection being formed between the support post and the extension mechanism by the annular array layout, ensuring stability and reliability of the system, the length of the extension mechanism and the distance between the outer ring and the inner ring being equal, so that the overall structure can be balanced and coordinated during installation and operation.
The length of the splice plate is the same as the distance between the inner ring and the outer ring, an air channel is arranged between the splice plate and the support column, and the area ratio of the air channel to the splice plate is 1:4, a plurality of rectangular air holes are formed in the surface of the splice plate, wherein the splice plates in the radial direction of the same pipe body are arranged in2 pieces and are mutually attached, one splice plate is fixedly connected with the support column, and the rectangular air holes of the other splice plate attached to the splice plate are also attached to the support column; the splice plates are arranged in a ring-shaped array around the central axis of the pipe body, are arranged according to the number of the support columns and the extension mechanisms, 24-36 splice plates are arranged for meeting the requirements of good contact surfaces and gas passing areas,
Through such design, the splice plate with air channel has been formed between the support column to ensure the flow of gas in the passageway, rectangular gas pocket on the splice plate has realized laminating each other, thereby has formed the panel that does not pass through gas when the piston removes, only the gas channel lets through gas, the annular array overall arrangement of splice plate provides more area of contact, has increased gas with exchange and transmission efficiency between the splice plate, such design helps stabilizing the air current, keeps gas concentration and mobility in the detection area, and improves the accuracy of detection.
The outer side of the inner ring is provided with an inner groove, the inner side of the outer ring is provided with an outer groove, two ends of the support column are hinged with the support through the inner groove and the outer groove, the support column is allowed to be adjusted within a bending angle range of 5-15 degrees, the splice plate and the extension mechanism are connected with the support column and the support in the same mode, in order to increase the contact area and stability between the outer ring and the pipe body, the sliding groove is arranged between the outer ring and the pipe body, and the length range of the sliding groove is set to be 3-5cm.
The inner groove and the outer groove provide a hinged connection point between the support column and the support, the support column and the support frame are allowed to bend and adjust within a certain angle range, the connection mode has flexibility, different installation and adjustment requirements can be met, meanwhile, the arrangement of the sliding groove increases the stability between the outer ring and the pipe body, the relative sliding caused by movement and vibration is reduced, the stability and the reliability of the system are maintained, and the normal operation and the accurate detection of the extension mechanism are ensured.
The detection mechanism is fixedly connected in the extension mechanism and consists of a pressure plate, a support rod and a base; the base is fixedly connected inside the detection mechanism, one end of the supporting rod is fixedly connected to the base, the other end of the supporting rod is fixedly connected to the pressure plate, the pressure plate is a rectangular thin plate and is positioned close to the outer ring, and the ratio of the area of the pressure plate to the bottom area of the shell is 1: and 3, extending an annular standing edge from the edge of the pressure plate, attaching the annular standing edge to the upper surface of the shell, and setting the distance between the pressure plate and the upper surface of the shell in a range of 1-3 cm.
As can be seen from the structure, as a method for measuring the flow rate by adopting a balance method, the mass of the magnetic steel is determined by comparing the gas flowing in the unit section, detecting the instantaneous displacement of the coil in the magnetic steel by a position detector in the base, and digitally displaying the current change of the coil by an electromagnetic force automatic compensation circuit; the pressure plate can form a closed area on the shell, so that gas cannot leak when pressure is applied to the pressure plate, the fit of the annular standing edge ensures good sealing performance, the area of the pressure plate is larger than the bottom area of the shell, a larger contact area can be provided for more accurately measuring the pressure change of the gas, and meanwhile, a distance in the range of 1-3cm can ensure that a proper gap is formed between the pressure plate and the shell, so that the gas can flow and apply pressure between the pressure plate and the shell; the design of the detection mechanism can ensure stable gas flow and accurate pressure measurement, and improve the reliability and the precision of a detection system.
A circular hole is formed in the side edge of the annular standing edge, the circular hole is used for communicating the inner part of the annular standing edge with the outer part of the shell, the diameter of the circular hole is set in the range of 0.5-0.8cm, 2 circular holes are formed in total, the circular holes are located in the same circle in the cross section direction of the pipe body, and through the arrangement of the circular holes, the inner gas and the outer gas are communicated with each other to form a gas channel; the gas is prevented from staying in the annular vertical edge when the detection mechanism detects, so that the detection precision is affected.
In summary, such purpose is to keep the pressure balance of the internal and external gases, ensure that inaccurate results will not be generated due to the difference of gas pressure in the detection process, and the selection of the number and diameter of the circular holes considers the requirement of gas flow, and meanwhile, the requirement of tightness and flow control is considered, the circular holes on the annular vertical edge can effectively realize the exchange of the internal and external gases, ensure the stable flow of the gases in the detection process, which is helpful to improve the accuracy and reliability of the detection system, and ensure that the measured gas parameters can accurately reflect the actual conditions.
The beneficial effects of the invention are as follows:
1. According to the invention, through setting the blocking effect between splice plates, the control and adjustment of the gas circulation position are realized, so that the gas can be stably transmitted in the detection area, and under the conditions of high concentration and high flow, the mechanism can prevent the gas from diffusing, ensure the gas to flow intensively in the required area, thereby accurately capturing and analyzing the target gas and improving the detection accuracy and reliability.
2. According to the invention, a certain self-adaptive adjustment margin is provided by designing the grooves of the inner ring and the outer ring, so that the detection equipment can be adjusted within the bending angle range of 5-15 degrees, the structure can adapt to the requirements of different angles and positions, and the adaptability and operability of the system are enhanced; the measuring process is simplified, stable connection is provided, and the system is not easy to loosen or lose efficacy in the using process; the possible loosening or friction problems are reduced, thereby ensuring the normal operation of the system.
3. The invention designs the circular holes in the same circle in the cross section direction of the pipe body, so that the internal and external gases can be mutually communicated to form a gas channel, thereby effectively preventing the gas from being detained in the annular vertical edge in the detection process and ensuring that the detection accuracy is not affected; eliminating obstructions that could cause gas stagnation, ensuring a uniform flow of gas around the detection mechanism and ensuring a more reliable result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will make brief description of the drawings used in the description of the embodiments or the prior art.
The overall schematic of the present invention is shown in fig. 1 and 6;
the overall installation schematic of the invention is shown in fig. 2;
The schematic diagram of the extension mechanism of the invention is shown in fig. 3;
The internal schematic of the extension mechanism of the present invention is shown in fig. 4 and 5;
FIG. 6 is an enlarged view of a portion of FIG. 7 in accordance with the present invention;
the inner schematic view of the outer ring of the present invention is shown in FIG. 8;
FIG. 9 is a diagram of the inner ring structure of the present invention;
FIG. 10 is a schematic view of a splice plate of the present invention;
The balance structure of the present invention is shown in fig. 11.
In the figure: 1. a tube body; 2. a bracket; 21. an inner ring; 211. an inner groove; 22. an outer ring; 221. an outer groove; 222. a sliding groove; 23. a support column; 24. an air passage; 3. an extension mechanism; 31. a housing; 311. a circular opening; 312. a cylindrical passage; 32. a piston; 33. a coil spring; 34. a rotating shaft; 341. a columnar protrusion; 342. a thread; 343. a barrier region; 35. splice plates; 351. rectangular air holes; 36. a connecting rod; 4. a detection mechanism; 41. a pressure plate; 411. a circular hole; 42. a support rod; 43. a base; 44. an annular standing edge.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is for aiding in understanding the present invention, and is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Embodiment one:
as shown in fig. 1, 2 and 6, the device for accurately measuring the carbon dioxide flow of the large-section pipeline based on the balance method comprises a pipe body 1, a bracket 2, an extension mechanism 3, a detection mechanism 4 and a control mechanism; the pipe body 1 is a metal pipe with a larger section and is specially used for conveying fluid or gas, the bracket 2 and the pipe body 1 are fixedly connected in a coaxial mode, the same axis is always kept to be firmly connected, the extending mechanism 3 is skillfully hinged inside the bracket 2, the extending mechanism can move within a certain range, the extending mechanism 3 is pushed by utilizing a gap formed between the pipe body 1 and the detecting mechanism 4 by utilizing gas and an air pressure difference generated based on Bernoulli principle, in particular, pushing or pulling of the extending mechanism 3 can be realized by utilizing a speed difference and a pressure difference formed between the pipe body 1 and the detecting mechanism 4, the detecting mechanism 4 is firmly connected to one side of the extending mechanism 3 and is closely matched with the extending mechanism to ensure normal operation of the extending mechanism, the detecting mechanism 4 is used for analyzing and measuring the mass change of carbon dioxide in the moving process based on the law of mass conservation, and the detecting mechanism 4 can provide accurate monitoring results by monitoring and recording the mass change condition of the carbon dioxide.
Through the impact force applied by the current carbon dioxide to the unit section of the pipeline, the detection mechanism 4 can realize rotary motion, so that the angle of gas impact is changed, and thus, the detection mechanism 4 can adjust the position according to the impact force applied by the carbon dioxide to the unit section of the pipeline 1, and further change the direction or angle of the gas impact, the detection mechanism 4 is electrically connected with the control mechanism, and through the electrical connection, the detection mechanism 4 can transmit the measured carbon dioxide data to the control mechanism for further analysis and control operation.
As shown in fig. 3, 4 and 5, the structure of the extension mechanism 3 includes a housing 31, a piston 32, a coil spring 33, a rotation shaft 34, a splice plate 35 and a connecting rod 36, the housing 31 is a rectangular cavity, a circular opening 311 is provided on the edge of the housing 31, the circular opening 311 extends inwards along the edge of the housing 31 to form a cylindrical channel 312, the piston 32 is mounted in the cylindrical channel 312 in a sliding connection manner, the diameter of the piston 32 is the same as the inner diameter of the cylindrical channel 312, the roughness in the cylindrical channel 312 is less than 1um, the piston 32 can freely move under the pressure, and the movement of the piston 32 in the cylindrical channel 312 is influenced by very small friction force and almost negligible friction force due to the restriction of friction force, so that the movement of the piston 32 in the cylindrical channel 312 is ensured to have very low friction resistance.
The rectangular cavity structure of the housing 31 and the formation of the circular opening 311 and the cylindrical passage 312 provide a smooth passage for the gas flow, which helps to reduce the resistance of the gas flow and improve the efficiency of the system; the sliding connection mode of the piston 32 and the diameter matched with the cylindrical channel 312 ensure the stable movement of the piston 32 in the channel, meanwhile, the roughness in the cylindrical channel 312 is smaller than 1um, the influence of friction on the movement of the piston 32 is reduced, the piston 32 can respond to the change of pressure freely, the friction force born by the piston 32 in the moving process is extremely small and can be almost negligible, and the energy loss and the heat generation are reduced, so that the extension mechanism 3 can realize efficient, stable and low-friction gas transmission and control in practical application.
The rotating shaft 34 is fixedly connected to the central line of the housing 31, and extends outwards to form a cylindrical bulge 341, and the cylindrical bulge 341 extends to two sides to form a double-head bearing shape, so that on one hand, the stability of the rotating shaft 34 is improved, on the other hand, the rotating shaft is well matched with the cylindrical channel 312, on the other hand, the ratio of the diameter of the cylindrical bulge 341 to the diameter of the cylindrical channel 312 is 1:2, and the stability and reliability of the rotating shaft 34 are improved; in addition, in order to reset the rotation shaft, the coil spring 33 is fixedly connected to the inside of the rotation shaft 34, and mainly functions to provide a rebound force when the rotation shaft 34 rotates due to a change in air pressure, and when the external air pressure is restored to a normal state, the coil spring 33 returns the rotation shaft 34 to its original position, and further retracts the piston 32 to an original position, thereby ensuring the reliability and stability of the extension mechanism 3, enabling it to effectively respond to the change in pressure, and having an automatic reset function.
The piston 32 is connected to the splice plate 35 at the proximal and outer sides thereof by a firm connection with the connecting rod 36, and the design is such that when the rotating shaft 34 rotates, the movement of the piston 32 causes the connecting rod 36 to move outwards, thereby extending the splice plate 35, by means of which the piston 32 can perform a specific action during the rotation of the rotating shaft 34 and transmit its movement to the splice plate 35, and by means of which the design makes it possible to achieve the desired function, and by means of the piston 32-connecting rod 36-splice plate 35 structure, the transmission of movement is achieved, enabling automatic control of the current contact surface by the gas.
As shown in fig. 6, the splice plates 35 are tightly connected to one end of the piston 32 through the connecting rods 36 and fixedly connected to the other end through the supporting columns 23, when the piston 32 moves, the connecting rods 36 drive the splice plates 35 to perform corresponding movements, and in an initial state, the rectangular air holes 351 on the two splice plates 35 are mutually attached; when the splice plates 35 move, the rectangular air holes 351 on adjacent splice plates 35 are blocked to form a region, so that air is prevented from passing between the splice plates 35, and only the air passage is kept open, so that the air can pass through; overall, the control and regulation of the gas passage is achieved by the blocking effect between the splice plates 35, so that the gas is stably transferred in the detection area, and the mechanism can prevent the gas from leaking or diffusing under the conditions of high concentration and high flow rate, ensure the concentrated flow of the gas in the required area, thereby improving the accuracy and reliability of detection, and by this gas control mechanism, the detection mechanism 4 can accurately capture and analyze the target gas.
As shown in fig. 7, on the outer edges of the both side cylindrical protrusions 341 of the rotation shaft 34, opposite-direction threads 342 are provided, respectively; when the piston 32 on one side is affected by the increase of the flow rate of the external air, the piston 32 moves outwards along the cylindrical channel 312, the rotating shaft 34 starts to rotate, and the piston 32 on the other side is driven to move outwards along with the rotation of the rotating shaft 34, so that the extension of the splice plates 35 on both sides of the extension mechanism 3 is realized, the cooperative movement of the pistons 32 on both sides is realized through the arrangement of the opposite threads 342, the normal function of the extension mechanism 3 is ensured, and the extension mechanism 3 can adjust the position of the splice plates 35 according to the change of the flow rate of the air under different air flow conditions, so that the required extension and contraction operation is realized, and the application is more flexible and controllable.
The piston 32 and the rotating shaft 34 are connected together through the screw 342, in order to control the movement range of the piston 32, the length of the screw 342 of the cylindrical protrusion 341 is set to be half of the length of the cylindrical protrusion 341, so as to ensure that the bonding effect between the splice plates 35 is good, and effective airtight isolation is achieved, a blocking area 343 is provided on the side of the near outer end of the screw 342 of the cylindrical protrusion 341, the length of which is 0.5cm, the blocking area 343 functions to prevent the piston 32 from sliding or falling off when the gas flow rate increases, and to limit the maximum position of the piston 32, ensure the normal operation of the extension mechanism 3, and the screw 342 structure in opposite directions and the blocking area 343 ensure the stable movement of the piston 32, and prevent the occurrence of problems of gas leakage or poor bonding effect between the splice plates 35.
As shown in fig. 8 and 9, the support 2 is composed of an inner ring 21 and an outer ring 22, wherein the diameter of the outer ring 22 is the same as the inner diameter of the pipe body 1, the diameter of the inner ring 21 is 2/3 of the diameter of the outer ring 22, the inner ring 21 and the outer ring 22 are fixedly connected through the support columns 23, the extending mechanisms 3 are arranged in a circular array around the central axis of the support 2, 16 extending mechanisms 3 are arranged in total, meanwhile, the support columns 23 are also arranged in a circular array, 16 extending mechanisms 3 are also arranged, the extending mechanisms 3 are positioned between the outer ring 22 and the inner ring 21, adjacent extending mechanisms 3 are fixedly connected through one support column 23, each support column 23 is fixedly connected at the right central position of the extending mechanism 3, the length of the extending mechanisms 3 and the distance between the outer ring 22 and the inner ring 21 are equal, the balance and stability of the whole structure are ensured, the layout and the connecting mode ensures that the extending mechanisms 3 and the support 2 are tightly matched to form a whole, and the sufficient support and stable operation and stability are ensured.
The arrangement of the inner and outer rings 22 of the bracket 2 and the support columns 23 enhances the structural stability of the system, so that the system can bear vibration and pressure change of the external environment; the arrangement of the annular array enables the extension mechanism 3 to be distributed uniformly and enables balanced force transmission and motion control to be achieved across the entire support 2, the consistency of the length and spacing of the extension mechanism 3 ensures accuracy and reliability of the system, by such design the co-ordination between the support 2 and the extension mechanism 3 is maximised, providing reliable structural support for the system, thereby enabling efficient operation and accurate measurement results.
The length of the splice plate 35 is the same as the distance between the inner ring 21 and the outer ring 22, an air channel 24 is arranged between the splice plate 35 and the support column 23, the area of the air channel 24 is four times that of the splice plate 35, a plurality of rectangular air holes 351 are formed in the surface of the splice plate 35, two splice plates 35 are arranged in the radial direction of the same pipe body 1 and are mutually attached, one splice plate 35 is fixedly connected with the support column 23, rectangular air holes 351 of the other splice plate 35 attached with the splice plate 35 are attached with the splice plates, the splice plates 35 are arranged around the central axis of the pipe body 1 in a circular array mode, and 32 splice plates 35 are arranged according to the number of the support column 23 and the extension mechanism 3 so as to meet the requirements of good contact surface and gas passing area.
As shown in fig. 10, the consistency of the length and the pitch of the splice plates 35 ensures airtight isolation and stable fitting effect, thereby effectively preventing gas leakage, and secondly, by the arrangement of the air passages 24, smoothness and uniformity of gas flow are achieved, accurate measurement results are ensured, and furthermore, the arrangement of the plurality of rectangular air holes 351 provides a larger contact area, connection strength and stability between the splice plates 35 are enhanced, the arrangement of the annular arrays and proper number of the splice plates 35 further improve accuracy and sensitivity of the system, and the close fit and optimized layout of the splice plates 35 and related structures provide reliable air tightness and accurate measurement performance.
As shown in fig. 1 and 6, the air passages 24 are formed between the splice plates 35 and the support columns 23 to ensure that the air flows in the passages, the rectangular air holes 351 on the splice plates 35 achieve the fit between each other, when the piston 32 moves, the areas where the air is not allowed to pass are formed between the splice plates 35, only the air passages allow the air to pass, the splice plates 35 adopt the annular array layout, more contact area is provided, the exchange and transfer efficiency between the air and the splice plates 35 is increased, the design helps to stabilize the air flow, the air concentration and the fluidity in the detection area are maintained, and the detection accuracy is improved.
As shown in fig. 8 and 9, the design of the inner grooves 211 and the outer grooves 221 of the inner ring 21 and the outer ring 22 provides adjustability and flexibility, so that the support column 23 can be adjusted within the bending angle range of 5 ° -15 °, and the adjustable design enables the structure to adapt to the requirements of different angles and positions, thereby enhancing the adaptability and operability of the system; the splice plate 35 and the extension mechanism 3 are connected with the support column 23 in the same way, so that the consistency and the integrity of the system are further improved, the consistency design simplifies the assembly process, stable connection is provided, and the system is not easy to loosen or lose efficacy in the use process; the sliding groove 222 is disposed between the outer ring 22 and the pipe body 1, and the length of the sliding groove 222 is set to 3cm, so that the contact area between the outer ring 22 and the pipe body 1 is enlarged, more stable support is provided, the stability and reliability of the structure are improved, and possible loosening or friction problems are reduced, so that the normal operation of the system is ensured.
As shown in fig. 11, the detecting mechanism 4 is composed of a pressure plate 41, a support rod 42 and a base 43; the pressure plate 41 is a rectangular thin plate, the pressure plate 41 is located at a position close to the outer ring 22, the ratio of the area of the pressure plate to the bottom area of the shell 31 is 1:3, the edge of the pressure plate 41 extends to form an annular standing edge 44, the annular standing edge is perfectly attached to the upper surface of the shell 31, and the distance between the pressure plate 41 and the upper surface of the shell 31 is set to be 3cm for ensuring good contact and stability.
When in use, the pressure plate 41 serves as a platform contacted with gas, when carbon dioxide passes through the pipe body 1, the gas impacts the pressure plate 41 under the limit of the structure, the support rods 42 are transmitted to the base 43, so that the internal position detector detects the instant displacement in the magnetic steel, and the electromagnetic force is automatically compensated by the control mechanism to display the current change in a digital mode, thereby determining the quality of the electromagnetic force; therefore, the measuring mode of the balance method is realized, and the detection mode is accurate, quick and small in error.
The detection mechanism 4 is fixedly connected inside the extension mechanism 3, the rectangular thin plate shape of the pressure plate 41 provides a larger area, so that the pressure plate can bear larger pressure and force, and the design of the annular standing edge 44 ensures good sealing performance and fitting degree; the proper distance between the pressure plate 41 and the housing 31 ensures a proper pressure and contact, enabling the detection mechanism 4 to operate effectively.
A circular hole 411 is provided on the side of the annular standing edge 44, the inside of the annular standing edge 44 is connected with the outside of the outer shell 31, the diameter of the circular hole 411 is set to be 0.5cm, and a total of 2 circular holes 411 are provided, the circular holes 411 are positioned in the same circle in the cross section direction of the tube body 1, and through the arrangement of the circular holes 411, the gas inside and outside can be communicated with each other to form a gas channel, so that the gas is prevented from being detained in the annular standing edge 44 in the detection process, and the detection accuracy is ensured not to be affected; by providing circular holes 411 in the annular rim 44, the internal and external gases can flow and exchange freely, this connectivity eliminates obstructions that could lead to gas stagnation, ensuring a uniform flow of gas around the detection mechanism 4, which is critical for accurate detection of the concentration of the target gas, as any stagnant gas can interfere with the detection result and reduce the detection accuracy; thus, by the provision of the circular holes 411, the problem of gas stagnation in the detection mechanism 4 is effectively solved, and the fluidity and uniformity of the gas in the system are ensured, such design details contributing to an improvement in the accuracy of the detection and ensuring a more reliable result.
When the electronic balance works, in an initial state, the splice plates 35 are bonded in pairs, the rectangular air holes 351 are bonded in pairs, a small amount of gas can pass through the rectangular air holes 351, and at the moment, the detection mechanism 4 can measure the current flow of carbon dioxide through a measurement structure of the electronic balance according to the current gas flow rate; when the carbon dioxide discharge increases, the gas flow rate increases, the gas passes through the gas channel, the gas passes through the device through the rectangular air holes 351, but when the gas passes through the gas channel, due to the existence of the cylindrical channel 312, the flow rate increases and the pressure decreases according to the Bernoulli principle, the piston 32 in the cylindrical channel 312 moves outwards under the action of the pressure, the rotating shaft 34 rotates, the piston 32 on the other side slides as well, one splice plate 35 moves under the action of the connecting rod 36, the other splice plate 35 is fixed on the supporting column 23, dislocation is formed between the splice plates 35, the rectangular air holes 351 are blocked, but due to the movement of the piston 32, the gas channel becomes larger, the gas channel is a position close to the detecting mechanism 4, the area of the gas circulation decreases, and the detecting precision becomes more stable under the condition of increasing the flow rate.
When the gas flow rate is continuously increased, unstable turbulence is easy to occur in the gas, the area through which the gas flows is reduced due to the sealing of the rectangular air holes 351, and the designed hinge structure, namely the whole extension mechanism 3 is bent in the high flow rate environment, the extension mechanism 3 forms an included angle with the pipe body 1, and the gas gathers towards the position of the detection mechanism 4 again; the sliding groove 222 provided in the outer groove 221 allows the splice plate 35 and the support column 23 to be displaced, thereby satisfying the centralization of the gas; when the gas flow rate decreases and the pressure also correspondingly decreases, the coil spring 33 in the rotating shaft 34 applies a reverse acting force, and the piston 32 is pulled back reversely, so that the splice plate 35 is retracted, and the rectangular air hole 351 of the splice plate 35 is re-fitted under the limit of the thread 342.
Even though the invention has been described with reference to specific exemplifying embodiments thereof, many different alternatives, modifications and the like will become apparent for those skilled in the art. Also, it should be noted that the circuit arrangement and manner of identification detection within the inventive device may be omitted, and may be exchanged or arranged in various ways, while the structure of the device is still capable of performing the functionality of the invention.
Claims (7)
1. The device for accurately measuring the carbon dioxide flow of the large-section pipeline based on the balance method comprises a pipe body (1), a bracket (2), an extension mechanism (3), a detection mechanism (4) and a control mechanism; the method is characterized in that: the pipe body (1) is a large-section metal pipeline, the support (2) is fixedly connected with the pipe body (1) in a coaxial manner, the extension mechanism (3) is hinged inside the support (2), and the extension mechanism (3) passes through a gap between the pipe body (1) and the detection mechanism (4) through gas, so that the extension mechanism (3) is pushed by the air pressure difference generated by the Bernoulli principle; the detection mechanism (4) is fixedly connected to one side of the extension mechanism (3), the detection mechanism (4) analyzes and measures the mass change in the carbon dioxide moving process based on the law of conservation of mass, and the detection mechanism (4) can rotate by the impact force of the current carbon dioxide on the unit section of the pipeline so as to change the angle of gas impact; the detection mechanism (4) is electrically connected with the control mechanism;
The extension mechanism (3) comprises a shell (31), a piston (32), a spiral spring (33), a rotating shaft (34), a splice plate (35) and a connecting rod (36); the shell (31) is a rectangular cavity, a circular opening (311) is formed in the edge of the shell (31), a cylindrical channel (312) extends inwards along the edge direction of the shell (31), the piston (32) is connected in a sliding manner in the cylindrical channel (312), the diameter of the piston (32) is the same as the inner diameter of the cylindrical channel (312), and the roughness in the cylindrical channel (312) is smaller than 1um; the rotating shaft (34) is positioned at the central line of the shell (31) and extends to the outer side to form a columnar bulge (341), and the ratio of the diameter of the columnar bulge (341) to the diameter of the columnar channel (312) is 1:2; the spiral spring (33) is positioned in the rotating shaft (34); the piston (32) is fixedly connected with the splice plate (35) at one side close to the outside through the connecting rod (36).
2. The balance-based large-section pipeline carbon dioxide flow accurate measurement device according to claim 1, wherein the device comprises: the outer edges of the columnar bulges (341) on two sides of the rotating shaft (34) are respectively provided with a thread (342) and the threads (342) are opposite, the piston (32) is rotationally connected with the rotating shaft (34) through the threads (342), the length of the threads (342) of the columnar bulges (341) is one half of that of the columnar bulges (341), and a blocking area (343) of 0.5 cm to 1cm is arranged on one side of the threads (342) close to the outer end of the columnar bulges (341).
3. The balance-based large-section pipeline carbon dioxide flow accurate measurement device according to claim 1, wherein the device comprises: the bracket (2) comprises an inner ring (21) and an outer ring (22); the diameter of the outer ring (22) is the same as the inner diameter of the pipe body (1), and the ratio of the diameter of the inner ring (21) to the diameter of the outer ring (22) is 2:3, interior ring (21) with pass through support column (23) fixed connection between outer loop (22), extending mechanism (3) centers on support (2) center pin annular array 12-18, support column (23) centers on support (2) center pin annular array 12-18 just extending mechanism (3) are located outer loop (22) with between inner loop (21), and adjacent two fixed connection between extending mechanism (3) one support column (23), support column (23) fixed connection is in extending mechanism (3) positive central position, extending mechanism (3) length with distance between outer loop (22) with inner loop (21) is the same.
4. The balance-based large-section pipeline carbon dioxide flow accurate measurement device according to claim 3, wherein: the length of the splice plate (35) is the same as the distance between the inner ring (21) and the outer ring (22), an air channel (24) is arranged between the splice plate (35) and the support column (23), and the area ratio of the air channel (24) to the splice plate (35) is 1:4, a step of; the surface of the splice plate (35) is provided with a plurality of rectangular air holes (351), the splice plates (35) in the radial direction of the same pipe body (1) are arranged into 2 pieces and are mutually attached, one splice plate (35) is fixedly connected with the support column (23), and the rectangular air holes (351) of the two mutually attached splice plates (35) are attached; the splice plates (35) are arranged in 24-36 annular arrays around the central axis of the pipe body (1).
5. The balance-based large-section pipeline carbon dioxide flow accurate measurement device according to claim 4, wherein the device comprises: an inner ring (21) shaped groove is formed in the outer side of the inner ring (21), an outer ring (22) shaped groove is formed in the inner side of the outer ring (22), two ends of the support column (23) are hinged with the support (2) through the inner ring (21) shaped groove and the outer ring (22) shaped groove, the allowable bending angle is within a range of 5-15 ℃, and the splice plate (35) and the extension mechanism (3) are connected with the support column (23) and the support (2) in the same mode; a sliding groove (222) is arranged between the outer ring (22) and the pipe body (1), and the length range of the sliding groove (222) is 3-5cm.
6. The balance-based large-section pipeline carbon dioxide flow accurate measurement device according to claim 3, wherein: the detection mechanism (4) is fixedly connected in the extension mechanism (3), and the detection mechanism (4) comprises a pressure plate (41), a support rod (42) and a base (43); the base (43) is fixedly connected in the detection mechanism (4); one end of the supporting rod (42) is fixedly connected with the base (43), the other end of the supporting rod is fixedly connected with the pressure plate (41), the pressure plate (41) is a rectangular thin plate and is positioned near the outer ring (22), and the ratio of the area of the pressure plate (41) to the bottom area of the shell (31) is 1:3, a step of; the edge of the pressure plate (41) extends to form an annular standing edge (44), the annular standing edge (44) is attached to the upper surface of the shell (31), and the distance between the pressure plate (41) and the upper surface of the shell (31) is within the range of 1-3 cm.
7. The balance-based large-section pipeline carbon dioxide flow accurate measurement device according to claim 6, wherein the device comprises: circular holes (411) are formed in the side edges of the annular vertical edges (44), the circular holes (411) are communicated with the inside of the annular vertical edges (44) and the outside of the shell (31), the diameters of the circular holes (411) are set within the range of 0.5-0.8cm, the number of the circular holes (411) is 2, and the circular holes (411) are arranged in the same circle in the cross-sectional area direction of the pipe body (1).
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| CN107101680A (en) * | 2017-04-21 | 2017-08-29 | 中国石油天然气股份有限公司 | Micro-flow metering system and method for metering flow by micro-flow system |
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