CN211262335U - Fluid flow measuring system - Google Patents
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- CN211262335U CN211262335U CN201922493535.8U CN201922493535U CN211262335U CN 211262335 U CN211262335 U CN 211262335U CN 201922493535 U CN201922493535 U CN 201922493535U CN 211262335 U CN211262335 U CN 211262335U
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Abstract
The utility model discloses a fluid flow measurement system, include: the detection pipeline is used for allowing the fluid to be detected to pass through; the detection element is arranged on the detection pipeline and used for acquiring and outputting parameter information of the fluid to be detected; the variable cross-section device comprises a driving part and an executing part in transmission connection with a power output end of the driving part, and the executing part acts to enable the cross section inside the detection pipeline to change; the variable cross-section collector is used for collecting variable cross-section information of the detection pipeline to obtain and output variable cross-section data; and the output module is electrically connected with the detection element and the variable cross-section collector and is used for obtaining and outputting the mass flow of the fluid according to the parameter information, the variable cross-section data, the detection pipeline parameters and the density of the fluid to be detected. The problems of high cost, large installation space and the like in the prior art are solved, the measuring range ratio is widened by changing the cross section of the detection pipeline on line, the cost is greatly reduced, and the installation space is reduced.
Description
Technical Field
The utility model relates to a flow measurement field specifically is a flow measurement system through change fluid pipe cross-sectional area in order to improve the measuring range ratio in the measurement process.
Background
For liquidThe flow measurement of body and gas is characterized by that a sensor is mounted on the pipeline through which the fluid can be flowed, and the sensor can be used for measuring electric signal, and said electric signal can reflect the pressure difference of fluid in the pipeline interior, and the flow speed of the fluid can be calculated by means of said pressure difference, and according to the relationship of density rho, flow speed v and cross-section A of the fluid and flow rate Q, Q ═ rho × v × A can obtain mass flow rate or volume flow rate Q ═ v × A, and the range measured by sensor is limited, so that the pressure difference delta p can be sensed in delta pmin～ΔpmaxThe ratio of the measuring ranges of the flow rates for the same measuring sensor:
in an actual use scene, the range ratio of some flow processes is very large, a single conventional flowmeter cannot meet the requirement of full-range measurement, in order to overcome the defect, a plurality of flow measuring devices are generally connected in parallel in the prior art, the full-range measurement is carried out in a valve switching or combining mode, different valve combinations need to be switched according to different flow states, on one hand, the measurement process is complicated, the control procedure is complex, and more execution elements are also needed to be matched to complete the switching of the measurement devices; on the other hand, the measurement cost is increased by several times; finally, a plurality of measuring devices need larger installation space, higher requirements are put forward for applicable environment, and correspondingly, the installation, maintenance and overhaul costs are greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fluid flow measurement system for overcome among the prior art measurement pipeline complicated, with high costs, control flow complicated, need defects such as installation space is great, compare through the range that changes fluid pipeline cross-sectional area in order to improve flow measurement in the measurement process, the measuring device's that has significantly reduced quantity simplifies the measurement control procedure, has reduced installation space, and has reduced installation, maintenance and overhaul cost.
To achieve the above object, the present invention provides a fluid flow measuring system, including:
the detection pipeline is used for allowing the fluid to be detected to pass through;
the detection element is arranged on the detection pipeline and used for acquiring and outputting parameter information of the fluid to be detected;
the variable cross-section device comprises a driving part and an executing part in transmission connection with a power output end of the driving part, and the executing part acts to enable the cross section inside the detection pipeline to change;
the variable cross-section collector is used for collecting variable cross-section information of the detection pipeline to obtain and output variable cross-section data;
and the output module is electrically connected with the detection element and the variable cross-section collector and is used for obtaining and outputting the flow of the fluid according to the parameter information, the variable cross-section data, the detection pipeline parameters and the density of the fluid to be detected.
Preferably, the detection element comprises at least one of two pressure sensors or a differential pressure sensor or a vortex street sensor; the parameter information comprises pressure difference data or vortex street frequency; the fluid flow measurement system further comprises:
and the input end of the control device is electrically connected with the detection element, the output end of the control device is electrically connected with the driving part of the variable cross-section device, and the control device is used for outputting a control command according to the differential pressure data or the vortex street frequency to control the action of the variable cross-section device so as to keep the differential pressure data or the vortex street frequency within an effective measuring range all the time.
Preferably, the control device is configured to send a pressurization signal to the driving component of the variable cross-section device when the differential pressure data of the fluid to be measured is smaller than the lower limit value of the differential pressure effective range or when the vortex street frequency is smaller than the lower limit value of the frequency effective range, so as to drive the execution component of the variable cross-section device to reduce the cross-sectional area of the detection pipeline until the differential pressure or the vortex street frequency data is between the upper limit value of the differential pressure effective range and the lower limit value of the differential pressure effective range.
Preferably, the control device is further configured to send a decompression signal to a driving component of the variable cross-section device when the differential pressure data of the fluid to be measured is greater than the upper limit value of the differential pressure effective range or when the vortex street frequency is greater than the upper limit value of the frequency effective range, so as to drive an execution component of the variable cross-section device to increase the cross-sectional area of the detection pipeline until the differential pressure or the vortex street frequency data is between the upper limit value of the differential pressure effective range and the lower limit value of the differential pressure effective range.
Preferably, the control device is further configured to send a constant-pressure signal to the driving component of the variable cross-section device when the differential pressure data of the fluid to be detected is between an upper limit value of the differential pressure effective range and a lower limit value of the differential pressure effective range or when the vortex street frequency is between an upper limit value of the frequency effective range and a lower limit value of the frequency effective range, so that the execution component of the variable cross-section device keeps in situ and does not change the cross-sectional area of the detection pipeline;
the time-varying cross-section data is the last state value.
Preferably, the variable cross-section collector comprises an angle sensor or a displacement sensor.
Preferably, the detection conduit is made of an elastic material or a flexible material;
the driving component is used for outputting linear motion; comprises a motor, a transmission mechanism in transmission connection with a motor spindle, and an air cylinder or a hydraulic oil cylinder;
the execution unit includes: the panels are arranged on two sides of the detection pipeline in parallel, each panel is fixedly connected with the detection pipeline, and at least one panel is connected with the power output end of the driving part;
further comprising:
and the axial pipeline compensator is connected between the two ends of the detection pipeline and the fluid pipeline to be detected and is used for compensating the axial length change of the detection pipeline caused in the extrusion deformation process.
Preferably, the detection conduit is made of a rigid material;
the execution component comprises an interference surface and connecting surfaces respectively hinged with two ends of the interference surface, the other ends of the connecting surfaces are hinged on the detection pipeline, and the interference surface swings around hinged shafts of the two connecting surfaces under the action of the driving component so as to change the cross section of the detection pipeline;
the driving part is arranged outside the detection pipeline and used for driving at least one hinged shaft of the connecting surface to rotate.
Preferably, the detection pipeline is a square pipeline, the connection surfaces are respectively installed on two opposite side surfaces of the detection pipeline, and the interference surface is a plane and parallel to the side surface between the two side surfaces.
Preferably, the execution component comprises an interference layer arranged on the inner wall of the detection pipeline, the edge of the interference layer is connected with the inner wall of the detection pipeline through an elastic film layer, and the interference layer, the elastic film layer and the inner wall of the detection pipeline covered by the interference layer together enclose to form a sealed cavity;
the detection pipeline is provided with a through hole communicated with the sealing cavity, and the through hole is connected with a driving part through a connecting pipe;
the driving component comprises a gas source or a liquid source and a conveying device for inputting or exhausting gas or liquid to or from the sealed cavity according to the instruction of the control device.
The utility model provides a fluid flow measurement system, during the use, at first with the detection piping erection in the straight section pipeline of fluid that awaits measuring, in the measurement process, accessible detecting element acquires the differential pressure or vortex street frequency isoparametric information when fluid flow through the detection pipeline is inside, through the cross-sectional area of the online dynamic change detection pipeline of variable cross-section device, change the inside fluidic flow state of detection pipeline, make detecting element's detected signal be in effective detection range, thereby the range ratio of extension measurement system flow, satisfy flow measurement system measurement demand under the complex environment, the quantity and the measurement control system's of having reduced detection pipeline and sensor scale, installation space has been dwindled greatly simultaneously, and reduce the installation, maintain and the cost of overhaul.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall structure of a fluid flow measuring system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first preferred embodiment of a variable cross-section apparatus for a fluid flow measurement system;
FIG. 3 is a first state reference diagram of a second preferred embodiment of a variable area device of a fluid flow measurement system;
FIG. 4 is a second state of the second preferred embodiment of the variable cross-section apparatus of the fluid flow measurement system with reference to FIG. two;
FIG. 5 is an axial cross-sectional view of a third preferred embodiment of a variable area device of a fluid flow measurement system;
fig. 6 is a schematic cross-sectional view of fig. 5.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Example one
As shown in fig. 1, an embodiment of the present invention provides a fluid flow measuring system, including: the device comprises a detection pipeline 1, a differential pressure sensor 2, a variable cross-section device 3, a variable cross-section collector 4, an output module 5 and a display module 6; the detection pipeline 1 is used for allowing a fluid to be detected to pass through; the detection element 2 is arranged on the detection pipeline 1 and used for acquiring and outputting parameter information of the fluid to be detected; the variable cross-section device 3 comprises a driving part 31 and an actuating part 32 in transmission connection with the power output end of the driving part 31, wherein the actuating part 32 acts to detect the change of the cross section inside the pipeline 1; the variable cross-section collector 4 is used for collecting variable cross-section information of the detection pipeline 1 to obtain variable cross-section data and outputting the variable cross-section data; the output module 5 is electrically connected with the detection element 2 and the variable cross-section collector 4, and is used for obtaining the flow rate of the fluid according to the parameter information, the variable cross-section data, the detection pipeline parameter and the density of the fluid to be detected and outputting the flow rate to the display module 6.
The detection pipeline 1 can be made of rigid materials (such as thick-wall steel pipes), or can be made of flexible materials or elastic materials (such as metal pipes such as thin-wall titanium alloy pipes and thin-wall spring steel pipes, or nonmetal pipes such as rubber hoses and carbon fiber pipes), and the cross section of the pipeline can be in a general circular shape, an oval shape or a square shape;
the detection element 2 can take the following four forms:
the first form adopts two pressure sensors, the measuring ends of the two sensors are respectively arranged on a variable cross section part of a detection pipeline and the detection pipeline which is positioned in the flow direction and has no changed cross section before the variable cross section part, the acquired parameter information is pressure, differential pressure data is obtained through the difference between the two acquired pressures, and the differential pressure data participates in flow calculation and the generation of a control instruction of a following control device;
the second form adopts a differential pressure sensor, two measuring ends are respectively arranged on a variable cross section part of a detection pipeline and the detection pipeline which is positioned in the flow direction and has no changed cross section in front of the variable cross section part, the collected parameter information is differential pressure, and the differential pressure data participates in flow calculation and the generation of a control instruction of a following control device;
in the third form, a vortex street sensor is adopted to measure the vortex street frequency of the fluid to be measured, and the parameter information is the vortex frequency; specifically, a specific (triangular prism type) flow blocking piece is installed along the radial direction of a variable cross-section pipeline, when fluid flows at a certain speed, two rows of alternately-changed vortexes are formed on two sides of the flow blocking piece, the vortexes are called as Karman vortex streets, and the flow speed can be obtained through the relationship between the vortex street frequency and a flow channel.
The fourth mode is that a total pressure and static pressure sensor or a combined total static pressure sensor is adopted and is arranged at a variable cross section part along the radial direction, the position of a pressure measuring point in a pipeline can be corrected along with the change of variable cross section parameters through the fluid velocity distribution of a flow channel cross section to obtain pressure difference, and the pressure difference data participates in flow calculation and the generation of a control instruction of a following control device;
when the detection pipeline 1 is made of a flexible material or an elastic material, the driving part 31 of the variable cross-section device 3 can adopt a motor to drive a transmission mechanism to convert a rotating torque into a pushing force or a pulling force in a linear direction, the executing part 32 can adopt two parallel panels which are respectively fixed on two sides of the detection pipeline 1, one panel is relatively fixed with the detection pipeline 1, for example, the panel is arranged on a fixed bracket, the other panel is connected with the output end of the transmission mechanism, the distance between the two panels is reduced under the driving of the motor to clamp and extrude one section of the detection pipeline 1, so that the detection pipeline 1 made of the flexible material or the elastic material is extruded to generate deformation, and the area of the cross section is further reduced; in the same way, the distance between the two panels can be increased by the reverse rotation of the motor, so that the detection pipeline 1 is subjected to tensile deformation (the deformed shape returns to the shape before the circular shape), and the area of the cross section is increased.
When the detection pipeline 1 is made of a rigid material, the actuating component 32 of the variable cross-section device 3 may be disposed on the inner wall of the detection pipeline 1, and the actuating component 32 may be formed by sequentially hinging three panels, wherein the end portions of the two panels at the two ends are respectively hinged on the pipe wall of the detection pipeline 1, and the actuating component 32 is driven by the driving component 31 to rotate the hinged shaft so as to move inside the detection pipeline 1, so that the middle panel gradually moves to a position close to the central axis of the detection pipeline 1 in the radial direction while moving along the axial direction of the detection pipeline 1, and in the process, the gap between the middle panel and the detection pipeline 1 is reduced, so that the cross section is reduced.
The cross section size of the detection pipeline 1 is changed in real time through the variable cross section device 3, so that the measurement data of the differential pressure sensor 2 can be always kept in the effective range, the range ratio is widened, compared with a method of combining a plurality of measurement devices in parallel in the prior art, the method can be realized through one detection pipeline, one set of sensor and the variable cross section device, and the equipment cost and the installation space are greatly reduced.
Preferably, the system further comprises a control device 7, wherein an input end of the control device 7 is electrically connected with the detection element 2, and an output end of the control device 7 is electrically connected with the driving component 31 of the variable cross-section device 3, and the control device is used for outputting a control command according to the parameter information to control the action of the variable cross-section device, so that the data of the parameter information is always kept in the effective range. In order to improve the operation efficiency of the variable cross-section device 3, the operation of the variable cross-section device 3 is automatically controlled by the control device 7 based on the measurement information or measurement data of the differential pressure sensor 2.
In an embodiment of the present invention, when the differential pressure data of the fluid to be measured is smaller than the lower limit of the effective range of differential pressure, the value is Δ p<ΔpminWhen the pressure difference data is between the upper limit value delta p of the effective range of the pressure difference, the control device 7 sends a pressurization signal to the driving part 31 of the variable cross-section device 3 to drive the execution part 32 of the variable cross-section device 3 to reduce the cross-sectional area of the detection pipeline 1 until the pressure difference data is between the upper limit value delta p of the effective range of the pressure differencemaxAnd the lower limit delta p of the effective range of the pressure differenceminBetween the values.
For example when the fluid flow that awaits measuring is less, the pressure differential is corresponding also less, when being less than the threshold value of sensor, it is 0 to show on data output, consequently need intervene to detect section pipeline 1 and make its cross-sectional area diminish, controlling means 7 output pressure boost signal this moment the utility model discloses an embodiment, after drive unit 31 received this pressure boost signal, drive executive component 32 forward direction removes and reduces the distance between the two panels and detect pipeline 1 with the extrusion for its cross-sectional area reduces, along with the reduction of cross-sectional area, Δ p can change, gather the signal in succession, constantly monitor Δ p's change, be Δ p in effective range scope promptly until pressure differential sensor 2 measured data Δ pmax≥Δp≥ΔpminTo meet the requirement of normal measurement and realize the measurement of Q less thanminMeasurements are made to improve the flow span ratio.
When the differential pressure data of the fluid to be measured is larger than or close to the upper limit value of the differential pressure range, namely delta p>ΔpmaxThe control device 7 sends a decompression signal to the driving part 31 of the variable cross-section device 3 to drive the execution part 32 of the variable cross-section device 3 to increase the cross-sectional area of the detection pipeline 1 until the differential pressure data is between the upper limit value delta p of the differential pressure rangemaxAnd the lower limit value delta p of the pressure difference rangeminIn the meantime.
For example, when the flow rate of the fluid to be measured is large, the pressure difference is correspondingly large, and when the pressure difference is larger than the upper measurement limit of the sensor, the pressure difference can be causedOutput saturation is sensor damage even, consequently need intervene to detecting section pipeline 1 and make its cross-sectional area grow, in the embodiment of the utility model, after drive unit 31 received this decompression signal, drive executive component 32 reverse movement increases the distance between the two panels with the compression capacity of release detection pipeline 1 for its cross-sectional area reduces, along with the increase of cross-sectional area, Δ p can change, gather the signal in succession, the change of Δ p is constantly monitored, it is Δ p promptly to be in effective range within range until 2 measured data Δ p of differential pressure sensor aremax≥Δp≥ΔpminSo that the measurement data of the differential pressure sensor 2 is in the normal range to meet the normal measurement requirement and realize the measurement of the measurement data greater than QmaxMeasurements are made to improve the flow span ratio. For example, a square tube or an oval tube is used for detection, and the cross section of the tube tends to be circular by a variable cross section device, so that the cross section area is enlarged.
When the differential pressure data of the fluid to be measured is between the upper limit value of the differential pressure effective range and the lower limit value of the differential pressure effective range, namely delta pmax≥Δp≥ΔpminThe control device 7 sends a constant pressure signal to the driving part 31 of the variable cross-section device, so that the execution part 32 of the variable cross-section device keeps the original position and does not change the cross-sectional area of the detection pipeline; the time-varying cross-section data is the last state value.
For example, when the flow rate of the fluid to be measured is moderate, the pressure difference is correspondingly moderate, and when the radius of the detection pipeline 1 is properly selected, the measurement data sensed by the pressure difference sensor 2 is normal, so that the detection section pipeline 1 does not need to be interfered, the cross-sectional area of the detection section pipeline does not change, and the measurement data of the pressure difference sensor 2 is within the normal range.
Preferably, the variable-section collector 4 comprises an angle sensor or a displacement sensor. The angle sensor can measure the rotation angle of the motor of the driving part 31, and the linear movement distance of the executing part 32 is obtained through the rotation angle of the motor and the transmission ratio of the transmission mechanism, so that the actual cross section data of the fluid to be detected when the fluid passes through the interior of the detection pipeline 1 can be obtained according to the movement distance and the parameters such as the diameter of the detection pipeline 1. The displacement sensor can be directly arranged on the part close to the execution component 32 on the detection pipeline 1, and can directly detect the inner diameter (or the distance between two sides) of the detection pipeline 1 when the detection pipeline 1 is extruded or stretched and deformed; or a displacement sensor is directly mounted on the action part of the executive component 32, and the extrusion deformation amount or the stretching deformation amount can be detected; and calculating according to the detected parameters such as the inner diameter of the pipeline, the deformation of the pipeline, the diameter of the pipeline and the like to obtain variable cross-section data.
Several preferred embodiments of the variable cross-section device 3 are given below:
Referring to fig. 2, the detection pipe 1 is made of an elastic material or a flexible material; pipeline compensators (not shown) such as corrugated pipes, sleeve structures and the like are respectively connected between the two ends of the detection pipeline and the pipeline to be detected and are used for compensating axial length changes caused in the extrusion deformation process of the detection pipeline; the driving part 31 is used for outputting linear motion; comprises a motor, a transmission mechanism in transmission connection with a motor spindle, and an air cylinder or a hydraulic oil cylinder; the transmission mechanism here is preferably a rack and pinion transmission mechanism or a screw mechanism 100; the actuating component 32 comprises a moving panel 33 and a fixed panel 34 which are arranged on two sides of the detection pipeline 1 in parallel, the moving panel 33 and the fixed panel 34 are both fixedly connected with the detection pipeline 1, the fixed panel 34 is connected with the fixed bracket 200, and the moving panel 33 is connected with the power output end of the driving component 31.
The motor rotates to drive the screw rod mechanism 100 to push the movable panel 33 to move in the horizontal direction, and when the movable panel moves in the direction close to the fixed panel 34, the movable panel is used for extruding the detection pipeline 1, so that the cross section area of the detection pipeline 1 is reduced; when the movable panel 33 moves away from the fixed panel 34, the cross-sectional area of the detection duct 1 is increased. In order to improve the stability of the transmission mechanism, two screw mechanisms can be arranged at intervals.
The driving part 31 adopts a motor or a pneumatic actuator or a hydraulic actuator, when the motor is driven, the output end of the motor is connected with the worm to drive the driving turbine, the driving turbine is installed on the screw rod of the screw rod mechanism 100, the purpose is to enable the driving mechanism to be self-locked, the deformation precision caused by the fluctuation of fluid is avoided, and meanwhile, the impact influence on the motor is prevented.
In order to make the center position of the detection pipeline 1 after the deformation in the radial direction consistent with the center position before the deformation, the variable cross-section devices of the first embodiment may be respectively disposed on two sides of the detection pipeline 1, so as to reduce the deformation of the detection pipeline 1 in the radial direction, balance the stress, and improve the service life of the detection pipeline 1.
Referring to fig. 3 and 4, the detection pipeline 1 is made of a rigid material; the cross section of the detection pipeline 1 is square; the actuating component 32 comprises an interference surface 35 and a first connecting surface 36 and a second connecting surface 37 hinged to two ends of the interference surface 35 respectively, the other ends of the first connecting surface 36 and the second connecting surface 37 are hinged to two parallel first side surfaces 11 of the detection pipeline 1, and the interference surface 35 swings around a hinge shaft 362 with the first connecting surface 36 and a hinge shaft 372 with the second connecting surface 37 under the action of the driving component 31 to change the size of the cross-sectional area of the detection pipeline 1; the interference surface 35 is planar and parallel to the second side 12 between the two parallel first sides 11. The driving member 31 is installed outside the detection pipe 1, and is used for driving the hinge shaft 362 of the first connection surface 36 connected with the detection pipe 1 and/or driving the hinge shaft 372 of the second connection surface 37 connected with the detection pipe 1 to rotate.
When the driving member 31 drives the hinge shaft 362 of the first connecting surface 36 connected with the detection pipeline 1 and/or drives the hinge shaft 372 of the second connecting surface 37 connected with the detection pipeline 1 to rotate, the first connecting surface 36 and the second connecting surface 37 drive the interference surface 35 to swing around the hinge shaft 361 of the first connecting surface 36 and the hinge shaft 371 of the second connecting surface 37, the interference surface 35 moves between the two second side surfaces 12, wherein the distance between the second side surface 12 departing from the executing member 32 and the interference surface 35 is adjusted, and further the cross-sectional area inside the detection pipeline 1 is changed. The state of fig. 3 shows a state in which the angle between the first connecting surface 36 and the second side surface 12 is 90 degrees, and the cross-sectional area of the interior of the detection pipe 1 is minimum; when the included angle between the first connecting surface 36 and the second side surface 12 is 0 degree or 180 degrees, the cross-sectional area inside the detection pipeline 1 is the largest; the state of fig. 4 shows a state in which the angle between the first connecting surface and the second side surface is 30 degrees, and the cross-sectional area is located therebetween.
In this embodiment, the first connecting surface 36 and the second connecting surface 37 are both arc-shaped surfaces, the middle portion of the interference surface 35 is a plane, and the portions of the two ends connected to the first connecting surface 36 and the second connecting surface 37 are arc-shaped, so that the fluid can flow more smoothly, and the flow channel state can be improved.
Preferred embodiment three
Referring to fig. 5, the actuating member 32 includes an interference layer 37 disposed on the inner wall of the detection conduit 1, the interference layer 37 is of a two-half structure, the edge of the interference layer 37 is connected to the inner wall of the detection conduit 1 through an elastic film layer 38, and the interference layer 37, the elastic film layer 38 and the inner wall of the detection conduit 1 covered by the interference layer 37 together enclose a sealed cavity 30; the detection pipeline 1 is provided with a through hole 301 communicated with the sealed cavity 30, and the through hole 301 is connected with a driving part 31 through a connecting pipe; the driving part 31 comprises a gas source or a liquid source and a conveying device for inputting or exhausting gas or liquid to or from the sealed cavity according to the instruction of the control device.
When the cross-sectional area needs to be reduced, the driving part 31 leads gas into the sealed cavity 30 through the connecting pipe and the through hole 301, and drives the interference layer 37 to move towards the central axis direction of the detection pipeline 1 in the radial direction, so that the cross-sectional area inside the detection pipeline 1 is reduced; the driving member 31 draws air from the sealed chamber 30 through the connecting pipe and the through hole 301, and drives the interference layer 37 to move in the radial direction toward the pipe wall of the detection pipe 1, thereby increasing the cross-sectional area inside the detection pipe 1.
When the cross section of the detection pipeline 1 is circular, the interference layer 37 can adopt a tile-shaped structure, the radian can generate elastic deformation, fig. 6 shows a state with the minimum cross section, and the interference layers 37 are not elastically deformed and just combined to form a circle; when the interior of the sealed cavity 30 is in a vacuum state, the interference layer 37 is expanded outwards under the action of the elastic layer 38, the central angle corresponding to the radian is reduced, the central angle is completely attached to the inner wall of the detection pipeline 1, and the cross-sectional area is approximately equal to the non-interference state of the detection pipeline 1 at the moment.
When the cross section of the detection pipeline 1 is square, the interference layer 37 may be made of a rigid material and disposed on an inner side wall or two opposite inner side walls of the detection pipeline 1.
The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. A fluid flow measurement system, comprising:
the detection pipeline is used for allowing the fluid to be detected to pass through;
the detection element is arranged on the detection pipeline and used for acquiring and outputting parameter information of the fluid to be detected;
the variable cross-section device comprises a driving part and an executing part in transmission connection with a power output end of the driving part, and the executing part acts to enable the cross section inside the detection pipeline to change;
the variable cross-section collector is used for collecting variable cross-section information of the detection pipeline to obtain and output variable cross-section data;
and the output module is electrically connected with the detection element and the variable cross-section collector and is used for obtaining the volume flow of the fluid according to the parameter information, the variable cross-section data and the detection pipeline parameters or obtaining the mass flow of the fluid by combining the density of the fluid to be detected and outputting the mass flow.
2. The fluid flow measurement system of claim 1, wherein the sensing element comprises at least one of two pressure sensors or a differential pressure sensor or a vortex street sensor; the parameter information comprises pressure difference data or vortex street frequency; the fluid flow measurement system further comprises:
and the input end of the control device is electrically connected with the detection element, the output end of the control device is electrically connected with the driving part of the variable cross-section device, and the control device is used for outputting a control command according to the differential pressure data or the vortex street frequency to control the action of the variable cross-section device so as to keep the differential pressure data or the vortex street frequency within an effective measuring range all the time.
3. The fluid flow measurement system of claim 2, wherein the control device is configured to send a boost signal to the drive component of the variable cross-section device to drive the actuator component of the variable cross-section device to reduce the cross-sectional area of the test conduit when the differential pressure data of the fluid under test is less than the lower differential pressure effective range limit or when the vortex street frequency is less than the lower frequency effective range limit until the differential pressure or vortex street frequency data is between the upper differential pressure effective range limit and the lower differential pressure effective range limit.
4. The fluid flow measurement system of claim 2, wherein the control device is further configured to send a depressurization signal to the actuation component of the variable cross-section device to actuate the actuation component of the variable cross-section device to increase the cross-sectional area of the detection conduit when the differential pressure data of the fluid under test is greater than the upper limit of the differential pressure valid range or when the vortex street frequency is greater than the upper limit of the frequency valid range until the differential pressure or the vortex street frequency data is between the upper limit of the differential pressure valid range and the lower limit of the differential pressure valid range.
5. The fluid flow measuring system of claim 2, wherein the control device is further configured to send a constant pressure signal to the driving component of the variable cross-section device when the differential pressure data of the fluid to be measured is between the upper limit value of the differential pressure effective range and the lower limit value of the differential pressure effective range or when the vortex street frequency is between the upper limit value of the frequency effective range and the lower limit value of the frequency effective range, so that the executing component of the variable cross-section device remains in place without changing the cross-sectional area of the detection pipeline;
the time-varying cross-section data is the last state value.
6. The fluid flow measurement system of any of claims 2-5, wherein the variable area collector comprises an angle sensor or a displacement sensor.
7. The fluid flow measurement system of claim 6, wherein the detection conduit is made of an elastic or flexible material;
the driving component is used for outputting linear motion; comprises a motor, a transmission mechanism in transmission connection with a motor spindle, and an air cylinder or a hydraulic oil cylinder;
the execution unit includes: the panels are arranged on two sides of the detection pipeline in parallel, each panel is fixedly connected with the detection pipeline, and at least one panel is connected with the power output end of the driving part;
further comprising:
and the axial pipeline compensator is connected between the two ends of the detection pipeline and the fluid pipeline to be detected and is used for compensating the axial length change of the detection pipeline caused in the extrusion deformation process.
8. The fluid flow measurement system of claim 6, wherein the detection conduit is made of a rigid material;
the execution component comprises an interference surface and connecting surfaces respectively hinged with two ends of the interference surface, the other ends of the connecting surfaces are hinged on the detection pipeline, and the interference surface swings around hinged shafts of the two connecting surfaces under the action of the driving component so as to change the cross section of the detection pipeline;
the driving part is arranged outside the detection pipeline and used for driving at least one hinged shaft of the connecting surface to rotate.
9. The fluid flow measurement system of claim 8, wherein the sensing tube is a square tube, the connection faces are respectively mounted on two opposite sides of the sensing tube, and the interference face is planar and parallel to a side between the two sides.
10. The fluid flow measuring system of claim 6, wherein the actuator comprises an interference layer disposed on the inner wall of the detection conduit, the edge of the interference layer is connected to the inner wall of the detection conduit through an elastic membrane layer, and the interference layer, the elastic membrane layer and the inner wall of the detection conduit covered by the interference layer together enclose a sealed cavity;
the detection pipeline is provided with a through hole communicated with the sealing cavity, and the through hole is connected with a driving part through a connecting pipe;
the driving component comprises a gas source or a liquid source and a conveying device for inputting or exhausting gas or liquid to or from the sealed cavity according to the instruction of the control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493535.8U CN211262335U (en) | 2019-12-31 | 2019-12-31 | Fluid flow measuring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922493535.8U CN211262335U (en) | 2019-12-31 | 2019-12-31 | Fluid flow measuring system |
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| CN211262335U true CN211262335U (en) | 2020-08-14 |
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| CN201922493535.8U Withdrawn - After Issue CN211262335U (en) | 2019-12-31 | 2019-12-31 | Fluid flow measuring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987095A (en) * | 2019-12-31 | 2020-04-10 | 姜春林 | Fluid flow measuring system |
| CN110987095B (en) * | 2019-12-31 | 2024-07-02 | 姜春林 | Fluid flow measurement system |
-
2019
- 2019-12-31 CN CN201922493535.8U patent/CN211262335U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987095A (en) * | 2019-12-31 | 2020-04-10 | 姜春林 | Fluid flow measuring system |
| CN110987095B (en) * | 2019-12-31 | 2024-07-02 | 姜春林 | Fluid flow measurement system |
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