CN116337190A - Calibration device and method for ultrasonic flowmeter - Google Patents
Calibration device and method for ultrasonic flowmeter Download PDFInfo
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- CN116337190A CN116337190A CN202310398043.9A CN202310398043A CN116337190A CN 116337190 A CN116337190 A CN 116337190A CN 202310398043 A CN202310398043 A CN 202310398043A CN 116337190 A CN116337190 A CN 116337190A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a calibrating device and a calibrating method for an ultrasonic flowmeter, wherein the calibrating device comprises two air-entraining pipes which are respectively used for being in butt joint with an inlet end and an outlet end of the ultrasonic flowmeter, the end parts of the air-entraining pipes are respectively provided with a reducing section, the reducing section is in a horn mouth shape, and the diameter of the outer end of the reducing section is larger than that of the inner end of the reducing section; each reducing section is provided with a straight pipe section for realizing the connection of the reducing section and the ultrasonic flowmeter pipeline; each straight pipe section is: one end is used for being in butt joint with the pipe orifice of the ultrasonic flowmeter, and the other end can be embedded into the corresponding reducing section, and the outer diameter of the straight pipe section is larger than the minimum inner diameter of the corresponding reducing section and smaller than the maximum inner diameter of the corresponding reducing section. The method is a using method of the calibration device. The scheme has simple structure, can reduce the influence of different fluid states on the calibration accuracy, and is simultaneously suitable for the calibration of ultrasonic flow meters with different sizes.
Description
Technical Field
The invention relates to the technical field of calibration of metering devices, in particular to a calibration device and method for an ultrasonic flowmeter.
Background
The flow meter is the metering equipment necessary in the natural gas pipeline system. For a long time, on natural gas pipeline systems, common flow meter forms are turbine flow meters, orifice plate flow meters, and the like. The mechanical metering equipment is complex in structure, and easy to cause blockage of a flow passage and rust of parts due to water vapor, particulate impurities and the like carried in the natural gas, so that the service life of the flowmeter can be reduced, and meanwhile, accurate metering is extremely unfavorable. The principle of the gas ultrasonic flowmeter is that the gas flow is obtained by utilizing the corresponding relation between the propagation speed of ultrasonic pulses in the gas flow and the speed of the gas flow, namely the propagation speed of ultrasonic pulses in the forward flow is faster than that in the backward flow, and the flow is larger as the propagation time difference of the two ultrasonic pulses is larger. In recent years, with the development of ultrasonic metering technology, the cost of an ultrasonic flowmeter is greatly reduced, and meanwhile, the core structure of the ultrasonic flowmeter is a circuit module and a transducer, so that the performance and the service life of the ultrasonic flowmeter are ensured not to be excessively influenced by a fluid medium, and the ultrasonic flowmeter has ideal metering accuracy under various working conditions and is now an internationally accepted natural gas metering device.
Calibration and calibration of the flowmeter is often required to ensure accurate measurement performance over a long period of time at the factory, before use, during use, or after maintenance of the flowmeter. The common flowmeter calibration method is a direct measurement method, and the basic principle is as follows: the method comprises the steps of enabling fluid to flow through a flowmeter to be measured and a calibrating device (a standard flowmeter, a weighing system and the like which are connected in series in a fluid pipeline at a certain constant flow rate, wherein the specific method comprises a volumetric method, a weighing method and a nozzle method, the calibration of the existing gas ultrasonic flowmeter is carried out by adopting a sonic nozzle or a long-neck nozzle for calibration), comparing the accumulated flow rate flowing through the flowmeter to be measured for a period of time with the actual accumulated flow rate flowing through the calibrating device, thus obtaining the error of the flowmeter to be measured under the flow rate condition, and adjusting the flow rate of the fluid to carry out multiple measurements at a plurality of flow rates, thus calculating the final error of the flowmeter to be measured.
Taking an ultrasonic flowmeter for natural gas metering as an example, the calibration performed on the ultrasonic flowmeter includes flow error measurement (flow calibration), and sensor reading measurement (such as measurement results of a temperature sensor and a pressure sensor, for configuration adjustment of the flowmeter through verification results, which is generally called dry calibration). The existing ultrasonic flowmeter calibration device is generally only suitable for calibrating a flowmeter of a specific model.
Disclosure of Invention
Aiming at the technical problem that the traditional ultrasonic flowmeter calibration device is generally only suitable for calibrating a flowmeter of a specific model, the invention provides a calibration device and method for an ultrasonic flowmeter. The scheme has simple structure, can reduce the influence of different fluid states on the calibration accuracy, and is simultaneously suitable for the calibration of ultrasonic flow meters with different sizes.
Aiming at the problems, the calibration device and the method for the ultrasonic flowmeter solve the problems through the technical key points that: the calibrating device for the ultrasonic flowmeter comprises two air-entraining pipes which are respectively used for being in butt joint with the inlet end and the outlet end of the ultrasonic flowmeter, the end parts of the air-entraining pipes are respectively provided with a reducing section, the reducing section is in a horn mouth shape, and the diameter of the outer end of the reducing section is larger than that of the inner end of the reducing section;
each reducing section is provided with a straight pipe section for realizing the connection of the reducing section and the ultrasonic flowmeter pipeline;
each straight pipe section is: one end is used for being in butt joint with the pipe orifice of the ultrasonic flowmeter, and the other end can be embedded into the corresponding reducing section, and the outer diameter of the straight pipe section is larger than the minimum inner diameter of the corresponding reducing section and smaller than the maximum inner diameter of the corresponding reducing section.
In the prior art, when the flow of an ultrasonic flowmeter such as a natural gas flow meter is calibrated, the calibrated ultrasonic flowmeter is firstly required to be connected in series with a gas circuit, then the gas circuit is used for providing metering gas for the ultrasonic flowmeter within a set time, wherein the instantaneous flow adjustment, the air pressure adjustment, the gas temperature adjustment and the like can be also exist according to the needs, and finally the flow calibration of the ultrasonic flowmeter can be completed by comparing the acquired metering value of the ultrasonic flowmeter with the flow value of the provided air flow. It can be understood that the flow value of the provided air flow is: the actual gas flow value provided to the ultrasonic flow meter by the corresponding pipeline can be measured by a volumetric method, a weighing method, a nozzle method and the like.
However, for the ultrasonic flowmeter manufacturer or a special ultrasonic flowmeter flow calibration mechanism, when the types or sizes of the ultrasonic flowmeters to be calibrated are different, a plurality of calibration systems are generally required to be configured to meet the requirements of connecting pipe orifices during the calibration of the ultrasonic flowmeters with different types or sizes and meeting the requirement of stabilizing the flow state. In order to make the ultrasonic flowmeter have the characteristics of difficult dirt accumulation and simple maintenance, the ultrasonic flowmeter produced in China mostly adopts a straight-through pipe structure. To meet the flow calibration requirements of these flowmeters, the present solution provides a calibration device as described above.
When the scheme is specifically used, the following method can be adopted to calibrate the ultrasonic flowmeter:
s1, completing connection of the calibrating device and an ultrasonic flowmeter, wherein each air guide pipe is connected with a corresponding pipe orifice of the ultrasonic flowmeter through a straight pipe joint, and it can be understood that the pipe orifice comprises an inlet end and an outlet end of the ultrasonic flowmeter, the inner diameter of any straight pipe joint is matched with the calibrated ultrasonic flowmeter, the inner diameter of the straight pipe joint is consistent with the inner diameter of the corresponding pipe orifice for obtaining calibrating fluid with a more stable fluid form, and the other end of the straight pipe joint is in butt joint with a variable-diameter section on the corresponding air guide pipe;
s2, calibrating the ultrasonic flowmeter by utilizing the air-entraining pipes, wherein relative to the ultrasonic flowmeter, the air-entraining pipes are used as air inlet pipes, the other air-entraining pipes are used as air outlet pipes, air flow for calibration is provided for the ultrasonic flowmeter, and the flow calibration of the ultrasonic flowmeter is completed by comparing the relation between the flow value of the ultrasonic flowmeter and the flow value of the provided air flow.
While as a person skilled in the art the present calibration device should be understood to be only part of a complete calibration system, such as a complete calibration system also involving components for providing a flow of gas for calibration, metering components for flow metering the flow of gas for calibration to obtain said flow value, it may also be provided to include related components for achieving ultrasonic flow meter connection and achieving dry targets in the following provision schemes, as desired.
The relevant structural design of this scheme is characterized by:
the straight pipe section is arranged, when the ultrasonic flowmeter is used, the straight pipe section is preferably a pipe section with the nominal diameter consistent with the nominal diameter of the orifice of the ultrasonic flowmeter to be calibrated, and the flow state of air flowing through the ultrasonic flowmeter can be more stable by utilizing the straight pipe section, so that the original deviation introduced during calibration can be reduced, and the flow calibration precision of the ultrasonic flowmeter can be improved;
the ultrasonic flowmeter is connected with the bleed air pipe through the straight pipe section, and the stable flow state can be realized and the series connection of the ultrasonic flowmeter in the air path can be completed by adopting the straight pipe section with proper length according to the pipe orifice size and the length size of the ultrasonic flowmeter with different nominal diameters, so that the universality of the calibration system can be effectively improved: only the straight pipe section is used as an adapter for the calibration of the ultrasonic flowmeter;
the device is arranged to realize connection of the straight pipe joint and the bleed pipe through the reducing section, the reducing section can be butted with the straight pipe joint with a certain size range (the simpler mode is between the maximum inner diameter and the minimum inner diameter of the reducing section, of course, if other pipe fittings are arranged at the pipe orifice of the straight pipe joint, the size range is not necessarily between the maximum inner diameter and the minimum inner diameter of the reducing section, and meanwhile, the maximum inner diameter of the reducing section is the inner diameter of the outer end of the reducing section, and the minimum inner diameter of the reducing section is the inner diameter of the inner end of the reducing section) so as to adapt to the calibration requirements of ultrasonic flowmeter with different models; meanwhile, the reducing section can play a role of a linear expanding section and a reducing section on the airflow path, so that the reducing section does not cause great influence on the stability of the airflow state of the ultrasonic flowmeter, and the high-precision flow calibration of the ultrasonic flowmeter can be ensured. To ensure the accuracy of flow calibration, for conventional ultrasonic flow meters for natural gas flow metering, a variable diameter section with a taper of less than 30 ° is preferably used, said taper preferably being less than 20 °.
In conclusion, the scheme provided by the method is simple in structure, can reduce the influence of different fluid states on calibration accuracy, and is suitable for calibrating ultrasonic flow meters of different sizes.
As a further technical scheme of the calibrating device for the ultrasonic flowmeter:
as a specific optional embodiment based on the conception, each induced draft tube is coaxial with the variable diameter section thereon, so that the pipelines at the front end and the rear end of the ultrasonic flowmeter are beneficial to enabling the airflow flowing through the ultrasonic flowmeter to have a more stable flow state;
on the basis of the coaxial arrangement, in order to improve the disassembly and assembly efficiency of the ultrasonic flowmeter on the calibration device, the further scheme is that the ultrasonic flowmeter further comprises a driving assembly, wherein the two air-entraining pipes are arranged on the driving assembly in a coaxial manner, the outer ends of the two reducing sections are opposite, and the driving assembly can drive the two air-entraining pipes to move in opposite directions and move in opposite directions. The specific setting principle and the preferred implementation mode of the scheme are as follows: the driving assembly can fix the two reducing sections in space in a coaxial mode with the outer ends facing each other, and aims at the ultrasonic flowmeter with the straight pipe joint and the general straight pipe structure connected to the two ends, under the action of the driving assembly, when the distance between the two reducing sections meets the requirement of embedding the ultrasonic flowmeter, the ultrasonic flowmeter is configured to be coaxial with the reducing sections, and then the driving assembly drives the two air-entraining pipes to move in opposite directions, so that the butt joint of each reducing section and the free end of the corresponding straight pipe joint can be completed; after the flow calibration is completed, the driving assembly drives the two air guide pipes to move back, and the ultrasonic flowmeter after the calibration can be removed. Therefore, in specific implementation, for the pipe orifice of the ultrasonic flowmeter with the connecting flange generally arranged, only the straight pipe joint is required to be provided with an adaptive flange, the straight pipe joint is connected with the flange of the ultrasonic flowmeter, and the butt joint of the straight pipe joint and the bleed pipe can be realized by utilizing the direct (direct contact) or indirect (setting the sealing ring as follows) mutual extrusion of the inner wall of the reducing section and the end part of the straight pipe joint. The driving assembly can adopt any one of a pneumatic mechanism, a hydraulic mechanism or a threaded rod transmission mechanism, and the pneumatic mechanism and the hydraulic mechanism which can be used are well known to the person skilled in the art, and as the pneumatic mechanism and the hydraulic mechanism respectively relate to the expansion and contraction of a piston rod, and additional supporting components are required to be configured for the air entraining pipe, a sliding friction pair is added in the specific structural design, and in the scheme, the threaded rod transmission mechanism provided as follows is preferably adopted: including the both ends have the threaded rod of the opposite external screw thread section of spiral to, equal threaded connection has the slider on each external screw thread section, all is provided with a bracing piece on each slider, and the upper end of each bracing piece all is provided with the staple bolt, through staple bolt centre gripping induced air pipe, like this, when the threaded rod rotates under driving motor's effect, through control rotation direction, can make two sliders move in opposite directions or move dorsad, has not only utilized the bracing piece to accomplish the support to induced air pipe like this, can reach the purpose of adjusting reducing section relative position simultaneously.
As a specific optional embodiment based on the above conception, as described above, since the gas introducing pipe with the reducing section can adapt to the connection of ultrasonic flow meters with different pipe orifices and length sizes, it is preferable to set the straight pipe section as an adapting piece for flow calibration assembly of ultrasonic flow meters of different types, in this usage mode, in order to promote the butt joint efficiency of the straight pipe section and the reducing section and the sealing reliability of the mating surface, and at the same time, the position for sealing maintenance is located at the end of the straight pipe section to ensure the efficiency of the calibration device, it is set to: the straight pipe joint is used for being in butt joint with the reducing section, and one end of the straight pipe joint is further provided with a sealing ring, and the sealing ring is detachably arranged on the straight pipe joint. In the concrete implementation, in order to avoid the occurrence of the indentation on the inner wall of the reducing section and ensure that the reducing section is maintenance-free, a scheme of only arranging the sealing ring on the straight pipe joint is preferably adopted. In order to facilitate the sealing effect and the life of the seal ring, the inner wall of the seal ring needs to be smooth for processing and maintenance.
As a specific optional embodiment based on the above conception, according to the use mode of the straight pipe joint, the sealing ring needs to be exposed at the end part of the straight pipe joint, and under the replaceable conception of the sealing ring, the sealing ring is provided with the following technical scheme with simple structure and good non-artificial falling-off prevention effect: the sealing ring comprises a straight pipe joint, and is characterized in that one end of the sealing ring is provided with a first annular groove coaxial with the sealing ring, the end face of the straight pipe joint is provided with a second annular groove coaxial with the straight pipe joint, a first annular bulge is formed between the first annular groove and the inner wall of the sealing ring, a second annular bulge is formed between the second annular groove and the outer wall of the straight pipe joint, the first annular bulge is embedded into the second annular groove, and the second annular bulge is embedded into the first annular groove; meanwhile, the corresponding annular groove can be obtained through simple mechanical processing or simple structural adjustment of an injection mold, and the disassembly and assembly of the corresponding annular groove and the annular bulge are very easy; the position of the sealing ring on the end face of the straight pipe section can not cause excessive influence on the air flow stability in the corresponding air flow channel.
As a specific optional embodiment based on the above conception, the outer side corner of the outer end of the sealing ring is a circular arc chamfer, and the structural feature of the embodiment is set as follows: when the straight pipe joint is in butt joint with the reducing section, aiming at an assembly body formed by the sealing ring and the straight pipe joint, the extruded position of the sealing ring is positioned at the outer side of the outer end of the assembly body, the structural characteristics of the circular arc chamfer are adopted, the premature fatigue of the sealing ring caused by stress concentration at the position can be avoided, and meanwhile, the structural design of the sealing ring also has the characteristic of easiness in processing.
As a specific alternative embodiment based on the above concept, in the above embodiment including the seal ring, the corresponding straight pipe section may be restrained by directly adopting the reducing section, but the assembly formed by the ultrasonic flowmeter, the straight pipe section and the like may cause uneven pressure on the seal ring in the circumferential direction, and although sealing can be achieved, the service life and the sealing reliability of the seal ring are disadvantageous, under the concept, preferred embodiments are as follows: each straight pipe section is provided with a supporting component for supporting the straight pipe section, and the supporting components are used for providing support for the assembly body, and the specific supporting height is that the straight pipe section is coaxial with the reducing section.
For satisfying the coaxial demand of straight tube coupling and reducing section in order to adapt to the straight tube coupling of different pipe diameters, simultaneously under the structural design of above threaded rod form drive assembly, make the position of assembly can be self-adaptation in order to make things convenient for the assembly to install, reduce simultaneously to the wearing and tearing of supporting component and/or straight tube coupling, set up to: the support assembly comprises a supporting rod with the top end height adjustable, a support plate connected to the supporting rod and antifriction strips arranged on the support plate;
the support plate is a linear arc plate, the antifriction bars are multiple and are arranged on the side face of the concave side of the support plate at intervals along the circumferential direction of the support plate, and the antifriction bars are parallel to the support plate;
when the support component supports the straight pipe section, the straight pipe section is supported on the concave side of the support plate through antifriction strips, and each antifriction strip is contacted with the outer wall of the straight pipe section. In this scheme, top height-adjustable's branch is used for disposing the axis height of assembly, and the specific configuration mode is: the position of the top end of the supporting rod can be calculated according to the axial height of the reducing section and the radius of the supported position of the straight pipe section; the linear arc-shaped plate is used for configuring the horizontal position of assembly, so that the coaxiality of the assembly body and the reducing section can be ensured; the antifriction strip is used as a supporting piece between the supporting plate and the straight pipe section, and it can be understood that the antifriction strip is used for reducing abrasion occurring in the supporting component and/or the straight pipe section, copper material can be adopted for the antifriction strip under the condition that the conventional supporting plate and the reducing section are selected, and one side of the antifriction strip, which is used for being in contact with the straight pipe section, is an arc-shaped surface which can be attached to the outer wall surface of the straight pipe section as much as possible.
As a specific optional embodiment based on the above concept, in order to make the support assembly be a universal piece, when adapting to straight pipe joints of different sizes, the support assembly and the straight pipe joints can be adapted by replacing the support plates of corresponding sizes, and the following steps are set: the backup pad passes through the connecting seat and can dismantle the top of being connected in branch.
A further embodiment is: the connecting seat is fixed on the outer convex side of the supporting plate and is positioned in the middle of the arc length direction of the supporting plate, an internal threaded hole is formed in the connecting seat, and when an orifice of the internal threaded hole faces to the right lower side, the concave side of the supporting plate faces to the right upper side;
the upper end of branch is provided with external screw thread section and location shoulder, branch pass through external screw thread section with internal thread hole threaded connection, the bottom surface of connecting seat with the location shoulder laminating mutually. The specific embodiment is characterized in that: the corresponding threaded connection structure is easy to process and convenient to use, the assembly precision of the supporting plate can be guaranteed through the matching relation between the positioning shaft shoulder and the bottom surface of the connecting seat, and the service life and the sealing reliability of the sealing ring are guaranteed through the supporting reliability of the supporting plate. Because flange connection between straight tube coupling and the ultrasonic flowmeter has certain assembly error, for the length direction that makes the backup pad can self-adaptation with the length direction of straight tube coupling, the better realization mode is: the support assembly supports on the slip table, and the bottom surface of support assembly can rotate and slide on the top surface of slip table. As a person skilled in the art, in order to achieve the rotation and sliding, the friction force between the bottom surface and the top surface is reduced, and the smooth bottom surface and the smooth top surface are specifically adopted to achieve the corresponding purpose.
In the embodiments provided above, for example, for the scheme of changing the relative position of the variable diameter section by using the driving assembly, in order to meet the position adjustment requirement and the pipeline connection requirement of the air guide pipe, only the hose needs to be connected to the air guide pipe, and the specific connection mode is determined according to the form of the driving assembly, so that the person skilled in the art does not need to carry out creative labor to achieve the corresponding purpose.
In the embodiments provided above, the calibration device has obvious characteristics when realizing the flow calibration of the ultrasonic flowmeter, and in order to enable the calibration device to be applicable to the dry calibration of the ultrasonic flowmeter as well, the following further specific embodiments are provided.
In dry standard, for the ultrasonic flowmeter for natural gas metering, in order to obtain the optimal metering state through configuration adjustment, it is necessary to detect the precision of a temperature sensor and a pressure sensor in the ultrasonic flowmeter, and for achieving the purpose, the pipe orifices at two ends of the ultrasonic flowmeter can be closed to realize pressure maintaining in the air passage of the ultrasonic flowmeter to finish the precision detection of the pressure sensor, and the gas pressure in the air passage can be changed when needed; similarly, for temperature sensor accuracy detection, there are also thermal insulation and temperature change operations.
In order to make the calibration device be applicable to ultrasonic flowmeter dry marks as well, the device also comprises an air source component, an air supplementing pipe and a circulating pump, wherein the air source component, the air supplementing pipe and the circulating pump are used as specific optional embodiments based on the conception;
the air source assembly comprises a pressure stabilizing tank, two air supplementing pipes which are communicated with the pressure stabilizing tank are connected to the pressure stabilizing tank, one air supplementing pipe is connected and communicated with one straight pipe section, and the other air supplementing pipe is connected and communicated with the other straight pipe section;
the circulating pump is connected in series between any air supplementing pipe and the pressure stabilizing tank or connected in series on any air supplementing pipe, and is used for driving fluid to enter the pressure stabilizing tank from the air supplementing pipe or enter the air supplementing pipe from the pressure stabilizing tank. The specific embodiment is provided with the following purposes and using modes: the bleed air pipe is cut off by adopting a control valve which is configured for the bleed air pipe or is positioned on the bleed air pipe, so that two ends of the assembly body are sealed, a reduced sealed space can be formed, and the maintenance or adjustment of the pressure and the temperature in the air passage of the ultrasonic flowmeter can be conveniently realized. Under the conception, in order to reduce or avoid the influence of the leakage of the upper sealing surface of the control valve, the leakage of the sealing surfaces of the straight pipe joint and the reducing section and the leakage of the sealing surfaces of the pipe orifice of the ultrasonic flowmeter on the air pressure stabilization and the air pressure adjustment, an air supplementing pipe is utilized to supplement air for a closed space, the effect of the pressure stabilizing tank is to provide air and reduce the air pressure change in the closed space, and when the pressure needs to be changed, the air pressure in the pressure stabilizing tank is changed; the device is characterized in that the straight pipe sections are connected with air supplementing pipes, so that under the action of the circulating pump, the gas can form internal circulation on the annular air paths formed by the air supplementing pipes, the pressure stabilizing tank straight pipe sections, the air guiding pipes, the reducing sections and the ultrasonic flowmeter, the temperature of each position is close, and the accuracy measurement of the temperature sensor of the ultrasonic flowmeter is facilitated to be realized rapidly.
As a specific alternative embodiment based on the above concept, to achieve the adjustment of the gas temperature in the ultrasonic flow meter, it is provided that: and a heating device for heating the fluid in the surge tank and/or the air supplementing pipe.
As a specific alternative embodiment based on the above concept, as a specific arrangement of the sensor for realizing the dry label, there is arranged: at least one straight pipe joint is provided with a sensor which is used for measuring the temperature and the pressure of fluid in the straight pipe joint. As a person skilled in the art, from the viewpoint of dry label efficiency, the temperature sensor for the dry label is preferably arranged on the two air guide pipes and positioned between the connection positions of the air supplementing pipes, and the installation requirement of the temperature sensor is not required to be adopted for the arrangement position of the pressure sensor for the dry label. By adopting the scheme, the sensor can be adapted to various types of straight pipe joints which can be used.
The invention has the following beneficial effects:
the straight pipe section is arranged, when the ultrasonic flowmeter is used, the straight pipe section is preferably a pipe section with the nominal diameter identical to the nominal diameter of the orifice of the ultrasonic flowmeter to be calibrated, and the flow state of air flowing through the ultrasonic flowmeter can be more stable by utilizing the straight pipe section, so that the original deviation can be introduced during calibration, and the flow calibration precision of the ultrasonic flowmeter can be improved;
The ultrasonic flowmeter is connected with the bleed air pipe through the straight pipe section, and the stable flow state can be realized and the series connection of the ultrasonic flowmeter in the air path can be completed by adopting the straight pipe section with proper length according to the pipe orifice size and the length size of the ultrasonic flowmeter with different nominal diameters, so that the universality of the calibration system can be effectively improved: only the straight pipe section is used as an adapter for the calibration of the ultrasonic flowmeter;
the device is arranged to realize connection of the straight pipe joint and the bleed pipe through the reducing section, the reducing section can be butted with the straight pipe joint with a certain size range (the simpler mode is between the maximum inner diameter and the minimum inner diameter of the reducing section, of course, if other pipe fittings are arranged at the pipe orifice of the straight pipe joint, the size range is not necessarily between the maximum inner diameter and the minimum inner diameter of the reducing section, and meanwhile, the maximum inner diameter of the reducing section is the inner diameter of the outer end of the reducing section, and the minimum inner diameter of the reducing section is the inner diameter of the inner end of the reducing section) so as to adapt to the calibration requirements of ultrasonic flowmeter with different models; meanwhile, the reducing section can play a role of a linear diameter expanding section and a reducing section on an airflow path, so that the reducing section does not cause great influence on the stability of the airflow state of the ultrasonic flowmeter, high-precision flow calibration of the ultrasonic flowmeter can be guaranteed, and for ensuring the precision value of flow calibration, the reducing section with the taper smaller than 30 DEG is preferably adopted for the common ultrasonic flowmeter for natural airflow metering, and the taper is preferably smaller than 20 deg.
In conclusion, the scheme provided by the method is simple in structure, can reduce the influence of different fluid states on calibration accuracy, and is suitable for calibrating ultrasonic flow meters of different sizes.
Drawings
FIG. 1 is a schematic structural view of a specific embodiment of a calibration device according to the present disclosure, where the position of a reducing section is in cross section;
fig. 2 is a partial enlarged view of the portion a shown in fig. 1;
FIG. 3 is a schematic view of the assembled structure of FIG. 2 after the straight pipe joint is disengaged from the seal ring;
FIG. 4 is a schematic illustration of an exemplary embodiment of a calibration device with dry label functionality provided based on the configuration shown in FIG. 1;
fig. 5 is a partial structural cross-sectional view of one embodiment of a support assembly according to the present disclosure.
The reference numerals in the drawings are respectively: 1. the ultrasonic flowmeter, 2, straight tube section, 3, reducing section, 4, sealing ring, 41, first ring channel, 42, second ring channel, 43, first annular bulge, 44, second annular bulge, 45, corner, 5, ring channel, 6, induced draft tube, 7, circulating pump, 8, make-up tube, 9, drive assembly, 10, control valve, 11, supporting component, 12, sensor, 13, air source subassembly, 14, branch, 15, connecting seat, 16, backup pad, 17, wear reducing strip.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples:
example 1:
as shown in fig. 1 to 5, the calibrating device for the ultrasonic flowmeter comprises two air entraining pipes 6 respectively used for being in butt joint with an inlet end and an outlet end of the ultrasonic flowmeter 1, the end parts of the air entraining pipes 6 are respectively provided with a reducing section 3, the reducing section 3 is in a horn mouth shape, and the diameter of the outer end of the reducing section 3 is larger than that of the inner end;
each reducing section 3 is provided with a straight pipe section 2 for realizing the pipeline connection between the reducing section 3 and the ultrasonic flowmeter 1;
each straight pipe section 2 is: one end is used for being in butt joint with the pipe orifice of the ultrasonic flowmeter 1, the other end can be embedded into the corresponding reducing section 3, and the outer diameter of the straight pipe section 2 is larger than the minimum inner diameter of the corresponding reducing section 3 and smaller than the maximum inner diameter of the corresponding reducing section 3.
In the prior art, when the flow of an ultrasonic flowmeter 1 for natural gas flow measurement is calibrated, the ultrasonic flowmeter 1 to be calibrated is firstly required to be connected in series with a gas circuit, then the gas circuit is used for providing the ultrasonic flowmeter 1 with gas for measurement in a set time, wherein instantaneous flow adjustment, air pressure adjustment, gas temperature adjustment and the like can be performed according to the needs, and finally the flow of the ultrasonic flowmeter 1 can be calibrated by comparing the acquired flow value of the ultrasonic flowmeter 1 and the flow value of the provided air flow. It can be understood that the flow value of the provided air flow is: the actual gas flow value supplied to the ultrasonic flowmeter 1 through the corresponding piping may be measured by a volumetric method, a weighing method, a nozzle method, or the like.
However, for the manufacturer of the ultrasonic flowmeter 1 or a special flow calibration mechanism of the ultrasonic flowmeter 1, when the types or sizes of the ultrasonic flowmeters 1 to be calibrated are different, a plurality of calibration systems are generally required to be configured to meet the requirements of pipe orifice connection and stable flow state during the calibration of the ultrasonic flowmeters 1 of different types or sizes. In order to enable the ultrasonic flowmeter 1 to have the characteristics of difficult pollution accumulation and simple maintenance, the ultrasonic flowmeter 1 produced in China mostly adopts a straight-through pipe structure, and in order to meet the flow calibration requirements of the flowmeters, the scheme provides the calibration device.
When the scheme is specifically used, the following method can be adopted to calibrate the ultrasonic flowmeter 1:
s1, completing connection of the calibrating device and the ultrasonic flowmeter 1, wherein each air guide pipe 6 is connected with a corresponding pipe orifice of the ultrasonic flowmeter 1 through a straight pipe section 2, and it can be understood that the pipe orifice comprises an inlet end and an outlet end of the ultrasonic flowmeter 1, the inner diameter of any straight pipe section 2 is matched with the calibrated ultrasonic flowmeter 1, in order to obtain calibrating fluid with a more stable fluid form, the inner diameter of the straight pipe section 2 is consistent with the inner diameter of the corresponding pipe orifice, and the other end of the straight pipe section 2 is in butt joint with a variable-diameter section 3 on the corresponding air guide pipe 6;
S2, calibrating the ultrasonic flowmeter 1 by using the air bleed pipe 6, wherein, relative to the ultrasonic flowmeter 1, the air flow for calibration is provided for the ultrasonic flowmeter 1 in a mode that one air bleed pipe 6 is used as an air inlet pipe and the other air bleed pipe 6 is used as an air outlet pipe, and the flow calibration of the ultrasonic flowmeter 1 is completed by comparing the relation between the flow value of the ultrasonic flowmeter 1 and the flow value of the provided air flow.
While as a person skilled in the art the present calibration device should be understood to be only part of a complete calibration system, such as a complete calibration system also involving components for providing a flow of gas for calibration, metering components for flow metering the flow of gas for calibration to obtain said flow value, it may also be provided to include related components for achieving the connection of the ultrasonic flow meter 1 and achieving the dry target in the following provision schemes, as desired.
The relevant structural design of this scheme is characterized by:
the straight pipe section 2 is arranged, when the ultrasonic flowmeter is used, the straight pipe section 2 preferably adopts a pipe section with the nominal diameter identical to the nominal diameter of the pipe orifice of the calibrated ultrasonic flowmeter 1, and the flow state of air flowing through the ultrasonic flowmeter 1 can be more stable by utilizing the straight pipe section 2, so that the original deviation can be introduced during calibration, and the accuracy of the flow calibration of the ultrasonic flowmeter 1 can be improved;
The ultrasonic flowmeter 1 is connected with the air entraining pipe 6 through the straight pipe joint 2, the stable flow state can be realized and the series connection of the ultrasonic flowmeter 1 in the air circuit can be completed by adopting the straight pipe joint 2 with proper length according to the pipe orifice size and the length size of the ultrasonic flowmeter 1 with different nominal diameters, and thus the universality of a calibration system can be effectively improved: only the straight pipe joint 2 is used as an adapter for the calibration of the ultrasonic flowmeter 1;
the setting is that the straight pipe section 2 is connected with the bleed air pipe 6 through the reducing section 3, the reducing section 3 can be butted with the straight pipe section 2 with a certain size range (in a simple mode, the size range is between the maximum inner diameter and the minimum inner diameter of the reducing section 3, of course, if other pipe fittings are arranged at the pipe orifice of the straight pipe section 2, the size range is not necessarily between the maximum inner diameter and the minimum inner diameter of the reducing section 3, and meanwhile, the maximum inner diameter of the reducing section 3 is the inner diameter of the outer end of the reducing section 3, and the minimum inner diameter of the reducing section 3 is the inner diameter of the inner end of the reducing section 3) so as to adapt to the calibrating requirements of the ultrasonic flowmeter 1 with different types; meanwhile, the reducing section 3 can play a role of a linear diameter expansion section and a linear diameter reduction section on an airflow path, so that the reducing section 3 does not have a large influence on the stability of the airflow state flowing through the ultrasonic flowmeter 1, high-precision flow calibration of the ultrasonic flowmeter 1 can be guaranteed, for guaranteeing the precision value of flow calibration, the reducing section 3 with the taper smaller than 30 degrees is preferably adopted for the common ultrasonic flowmeter 1 for natural airflow metering, and the taper is preferably smaller than 20 degrees.
In conclusion, the scheme provided by the scheme is simple in structure, can reduce the influence of different fluid states on calibration accuracy, and is suitable for calibrating the ultrasonic flowmeter 1 with different sizes.
Example 2:
this example is further defined on the basis of example 1:
as a specific alternative embodiment based on the above conception, each air guiding pipe 6 is coaxial with the reducing section 3 thereon, so that the pipelines at the front end and the rear end of the ultrasonic flowmeter 1 are beneficial to the airflow flowing through the ultrasonic flowmeter 1 to have a more stable flow state;
on the basis of the coaxial arrangement, in order to improve the disassembly and assembly efficiency of the ultrasonic flowmeter 1 on the calibration device, the further scheme is that the ultrasonic flowmeter further comprises a driving assembly 9, the two air guide pipes 6 are arranged on the driving assembly 9 in a coaxial manner, the outer ends of the two reducing sections 3 are opposite, and the driving assembly 9 can drive the two air guide pipes 6 to move in opposite directions and move in opposite directions. The specific setting principle and the preferred implementation mode of the scheme are as follows: the driving assembly 9 can fix the two reducing sections 3 in space in a coaxial mode with the outer ends facing each other, and aiming at the ultrasonic flowmeter 1 with the straight pipe section 2 and the general straight pipe structure connected to the two ends, under the action of the driving assembly 9, when the distance between the two reducing sections 3 meets the requirement that the ultrasonic flowmeter 1 is embedded, the ultrasonic flowmeter 1 is configured to be coaxial with the reducing sections 3, and then the driving assembly 9 drives the two air pipes 6 to move in opposite directions, so that the butt joint of each reducing section 3 and the free end of the corresponding straight pipe section 2 can be completed; after the flow calibration is completed, the driving assembly 9 drives the two air guide pipes 6 to move back, and the ultrasonic flowmeter 1 after the calibration can be removed. Therefore, in the concrete implementation, for the pipe orifice of the ultrasonic flowmeter 1 with a connecting flange, only an adaptive flange is required to be arranged on the straight pipe section 2, the straight pipe section 2 is in flange connection with the ultrasonic flowmeter 1, and the butt joint of the straight pipe section 2 and the bleed pipe 6 can be realized by utilizing the direct (direct contact) or indirect (setting a sealing ring 4 as described below) mutual extrusion of the inner wall of the reducing section 3 and the end part of the straight pipe section 2. The drive assembly 9 may be any one of a pneumatic mechanism, a hydraulic mechanism or a threaded rod transmission mechanism, and the pneumatic mechanism and the hydraulic mechanism which can be used are well known to those skilled in the art, and since the pneumatic mechanism and the hydraulic mechanism are respectively related to the expansion and contraction of a piston rod, and additional supporting components are required to be configured for the air entraining pipe 6, a sliding friction pair is added in the specific structural design, and in the scheme, the threaded rod transmission mechanism provided as follows is preferably adopted: including the both ends have the threaded rod of the opposite external screw thread section of spiral to, equal threaded connection has the slider on each external screw thread section, all is provided with a bracing piece on each slider, and the upper end of each bracing piece all is provided with the staple bolt, through staple bolt centre gripping induced duct 6, like this, when the threaded rod rotates under driving motor's effect, through controlling the direction of rotation, can make two sliders move in opposite directions or move dorsad, has not only utilized the bracing piece to accomplish the support to induced duct 6 like this, can reach the purpose of adjusting the relative position of reducing section 3 simultaneously.
Example 3:
this example is further defined on the basis of example 1:
as a specific alternative embodiment based on the above concept, as described above, since the bleed air pipe 6 with the reducing section 3 can be adapted to the connection of different pipe orifices and length-sized ultrasonic flowmeters 1, it is preferable to arrange the straight pipe section 2 as an adapter for the flow calibration assembly of different types of ultrasonic flowmeters 1, in this manner of use, in order to promote the efficiency of the butt joint of the straight pipe section 2 with the reducing section 3 and the reliability of the seal of the mating surface, while having the position of seal maintenance at the end of the straight pipe section 2 to ensure the efficiency of the calibration device, it is arranged that: the straight pipe section 2 is used for being in butt joint with the reducing section 3, one end is further provided with a sealing ring 4, and the sealing ring 4 is detachably arranged on the straight pipe section 2. In the concrete implementation, in order to avoid the occurrence of the indentation on the inner wall of the reducing segment 3 and ensure that the reducing segment 3 is maintenance-free, the scheme of only arranging the sealing ring 4 on the straight pipe section 2 is preferably adopted. In order to facilitate the sealing effect and the life of the seal ring 4, it is necessary to maintain the inner wall of the seal ring 4 smooth from the viewpoint of processing and maintenance for the reducing segment 3.
As a specific alternative embodiment based on the above conception, according to the usage mode of the straight pipe section 2, the sealing ring 4 needs to be exposed at the end of the straight pipe section 2, and under the replaceable conception of the sealing ring 4, the technical scheme with simple structure and good non-artificial falling-off prevention effect of the sealing ring 4 is as follows: one end of the sealing ring 4 is provided with a first annular groove 41 coaxial with the sealing ring 4, the end face of the straight pipe section 2 is provided with a second annular groove 42 coaxial with the straight pipe section 2, a first annular bulge 3 is formed between the first annular groove 41 and the inner wall of the sealing ring 4, a second annular bulge 44 is formed between the second annular groove 42 and the outer wall of the straight pipe section 2, the first annular bulge 3 is embedded into the second annular groove 42, and the second annular bulge 44 is embedded into the first annular groove 41; meanwhile, the corresponding annular groove 5 can be obtained through simple mechanical processing or simple structural adjustment of an injection mold, and the disassembly and assembly of the corresponding annular groove 5 and the annular bulge are very easy; the position of the sealing ring 4 on the end face of the straight pipe section 2 does not have excessive influence on the air flow stability in the corresponding air flow channel.
As a specific alternative embodiment based on the above conception, the outer corner 45 of the outer end of the sealing ring 4 is a circular arc chamfer, and the structural feature of this embodiment is set as follows: when the straight pipe joint 2 is in butt joint with the reducing section 3, aiming at an assembly body formed by the sealing ring 4 and the straight pipe joint 2, the extruded position of the sealing ring 4 is positioned at the outer side of the outer end of the assembly body, the structural characteristics of the circular arc chamfer are adopted, the premature fatigue of the sealing ring 4 caused by stress concentration at the position can be avoided, and meanwhile, the structural design of the sealing ring 4 also has the characteristic of easiness in processing.
Example 4:
this example is further defined on the basis of example 1:
as a specific alternative embodiment based on the above concept, in the above embodiment including the seal ring 4, the corresponding straight pipe section can be restrained by directly adopting the reducing section 3, but the assembly formed by the ultrasonic flowmeter 1, the straight pipe section 2 and the like can cause uneven pressure on the seal ring 4 in the circumferential direction, and although sealing can be realized, the service life and sealing reliability of the seal ring 4 are disadvantageous, and in the concept, preferred embodiments are: each straight pipe section 2 is provided with a support assembly 11 for supporting the straight pipe section 2, the above support assemblies 11 being used for providing support to the assembly, in particular at a height such that the straight pipe section 2 is coaxial with the variable diameter section 3.
For satisfying the coaxial demand of straight tube festival 2 and reducing section 3 in order to adapt to the straight tube festival 2 of different pipe diameters, simultaneously under the structural design of above threaded rod form drive assembly 9, make the position of the assembly can be self-adaptation in order to make things convenient for the assembly installation, reduce simultaneously to the wearing and tearing of supporting component 11 and/or straight tube festival 2, set up to: the supporting component 11 comprises a supporting rod 14 with the top end height adjustable, a supporting plate 16 connected to the supporting rod 14 and antifriction strips 17 arranged on the supporting plate 16;
the support plate 16 is a linear arc plate, the antifriction strips 17 are a plurality of and are arranged on the side surface of the concave side of the support plate 16 at intervals along the circumferential direction of the support plate 16, and the antifriction strips 17 are parallel to the support plate 16;
when the support assembly 11 supports the straight pipe section 2, the straight pipe section 2 is supported on the concave side of the support plate 16 through the wear reducing bars 17, and each wear reducing bar 17 is contacted with the outer wall of the straight pipe section 2. In this solution, the supporting rod 14 with adjustable top end height is used for configuring the axial height of the assembly body, and the specific configuration mode is as follows: the position of the top end of the supporting rod 14 can be calculated according to the axial height of the variable-diameter section 3 and the radius of the supported position of the straight pipe section 2; the linear arc-shaped plate is used for configuring the horizontal position of assembly, so that the coaxiality of the assembly body and the reducing section 3 can be ensured; the antifriction strips 17 serve as a supporting member between the supporting plate 16 and the straight pipe section 2, and it can be understood that the antifriction strips 17 are used for reducing wear occurring on the supporting component 11 and/or the straight pipe section 2, and under the condition that the conventional supporting plate 16 and the reducing section 3 are made of copper materials, the antifriction strips 17 can be made of copper materials, and the side, which is used for being in contact with the straight pipe section 2, of the antifriction strips 17 is provided with an arc-shaped surface which can be attached to the outer wall surface of the straight pipe section 2 as much as possible.
As a specific alternative embodiment based on the above concept, in order to make the support assembly 11 be a universal piece, when adapting to straight pipe sections 2 of different sizes, the support assembly 11 can be adapted to the straight pipe sections 2 by replacing the support plates 16 of corresponding sizes, and the following steps are set: the support plate 16 is detachably connected to the top ends of the struts 14 through the connection seats 15.
A further embodiment is: the connecting seat 15 is fixed on the outer convex side of the supporting plate 16 and is positioned in the middle of the arc length direction of the supporting plate 16, an internal threaded hole is formed in the connecting seat 15, and when the orifice of the internal threaded hole faces to the right lower side, the concave side of the supporting plate 16 faces to the right upper side;
the upper end of the supporting rod 14 is provided with an external thread section and a positioning shaft shoulder, the supporting rod 14 is in threaded connection with the internal thread hole through the external thread section, and the bottom surface of the connecting seat 15 is attached to the positioning shaft shoulder. The specific embodiment is characterized in that: the corresponding threaded connection structure is easy to process and convenient to use, the assembly precision of the support plate 16 can be guaranteed through the matching relation between the positioning shaft shoulder and the bottom surface of the connecting seat 15, and the service life and the sealing reliability of the sealing ring 4 are guaranteed through the support reliability of the support plate 16. Because the flange connection between the straight pipe section 2 and the ultrasonic flowmeter 1 has a certain assembly error, in order to enable the length direction of the support plate 16 and the length direction of the straight pipe section 2 to be self-adaptively adapted, a better implementation mode is as follows: the support assembly 11 is supported on the slipway, and the bottom surface of the support assembly 11 can rotate and slide on the top surface of the slipway. As a person skilled in the art, in order to achieve the rotation and sliding, the friction force between the bottom surface and the top surface is reduced, and the smooth bottom surface and the smooth top surface are specifically adopted to achieve the corresponding purpose.
In the embodiments provided above, as for the solution of changing the relative position of the reducing section 3 by means of the drive assembly 9, in order to meet the position adjustment requirements of the bleed air duct 6 and the pipeline connection requirements, only hoses need to be connected to the bleed air duct 6, and the specific connection mode is determined according to the form of the drive assembly 9, and the person skilled in the art does not need to carry out the corresponding purpose with inventive effort.
Example 5:
this example is further defined on the basis of example 1:
in the above-provided embodiments, the calibration device has obvious characteristics when the flow calibration of the ultrasonic flowmeter 1 is realized, and in order to enable the calibration device to be applicable to the dry calibration of the ultrasonic flowmeter 1 as well, the following further specific embodiments are provided.
In dry calibration, for the ultrasonic flowmeter 1 for natural gas metering, in order to obtain the optimal metering state through configuration adjustment, it is necessary to detect the precision of the temperature sensor 12 and the pressure sensor 12 in the ultrasonic flowmeter 1, and for this purpose, the operation can be adopted to seal the nozzles at both ends of the ultrasonic flowmeter 1 so as to realize pressure maintaining in the air passage of the ultrasonic flowmeter 1 to complete the precision detection of the pressure sensor 12 and change the gas pressure in the air passage when needed; similarly, for accurate detection of the temperature sensor 12, there is also a soak and soak operation.
In order to make the calibration device be applicable to dry calibration of the ultrasonic flowmeter 1, the device also comprises an air source assembly 13, an air supplementing pipe 8 and a circulating pump 7 as a specific alternative embodiment based on the above conception;
the air source assembly 13 comprises a surge tank, two air supplementing pipes 8 which are communicated with the surge tank are connected to the surge tank, one air supplementing pipe 8 is connected and communicated with one straight pipe section 2, and the other air supplementing pipe 8 is connected and communicated with the other straight pipe section 2;
the circulating pump 7 is connected in series between any air supplementing pipe 8 and the surge tank or connected in series on any air supplementing pipe 8, and the circulating pump 7 is used for driving fluid to enter the surge tank from the air supplementing pipe 8 or enter the air supplementing pipe 8 from the surge tank. The specific embodiment is provided with the following purposes and using modes: the bleed air pipe 6 is cut off by adopting a control valve 10 which is configured for the bleed air pipe 6 or is positioned on the bleed air pipe 6, so that two ends of the assembly body are sealed, a reduced sealed space can be formed, and the maintenance or adjustment of the pressure and the temperature in the air passage of the ultrasonic flowmeter 1 is convenient to realize. Under the conception, in order to reduce or avoid the influence of the leakage of the upper sealing surface of the control valve 10, the leakage of the sealing surfaces of the straight pipe section 2 and the reducing section 3, and the leakage of the sealing surfaces of the pipe orifices of the straight pipe section 2 and the ultrasonic flowmeter 1 on the air pressure stabilization and the air pressure adjustment, the air supplementing pipe 8 is utilized to supplement air for the closed space, the pressure stabilizing tank is used for providing air and reducing the air pressure change in the closed space, and when the pressure needs to be changed, the air pressure in the pressure stabilizing tank is changed; the air supplementing pipes 8 are connected to the straight pipe sections 2, so that under the action of the circulating pump 7, the air can form internal circulation on annular air paths formed by the air supplementing pipes 8, the pressure stabilizing tank straight pipe sections 2, the air entraining pipes 6, the reducing sections 3 and the ultrasonic flowmeter 1, the temperatures of all the positions are close, and the accurate measurement of the temperature sensor 12 of the ultrasonic flowmeter 1 is facilitated.
As a specific alternative embodiment based on the above concept, to achieve the adjustment of the gas temperature in the ultrasonic flow meter 1, it is provided that: and also comprises a heating device for heating the fluid in the surge tank and/or the air supplementing pipe 8.
As a specific alternative embodiment based on the above concept, as a specific arrangement of the sensor 12 for realizing the dry label, there is arranged: at least one straight pipe section 2 is provided with a sensor 12, said sensor 12 being arranged to measure the temperature and the pressure of the fluid in the straight pipe section 2. As a person skilled in the art, from the viewpoint of efficiency of the dry label, the temperature sensor 12 for the dry label is preferably arranged on the two air ducts 6 and between the connection positions of the air supply ducts 8, and the above installation requirement of the temperature sensor 12 is not required for the arrangement position of the pressure sensor 12 for the dry label. With this solution, the sensor 12 can be adapted to various types of straight pipe sections 2 that can be used.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments, and it is not intended that the invention be limited to these descriptions. Other embodiments of the invention, which are apparent to those skilled in the art to which the invention pertains without departing from its technical scope, shall be covered by the protection scope of the invention.
Claims (10)
1. The calibrating device for the ultrasonic flowmeter comprises two air-entraining pipes (6) which are respectively used for being in butt joint with the inlet end and the outlet end of the ultrasonic flowmeter (1), and is characterized in that the end parts of the air-entraining pipes (6) are respectively provided with a reducing section (3), the reducing section (3) is in a horn mouth shape, and the diameter of the outer end of the reducing section (3) is larger than that of the inner end of the reducing section;
each reducing section (3) is provided with a straight pipe section (2) for realizing the pipeline connection of the reducing section (3) and the ultrasonic flowmeter (1);
each straight pipe section (2) is: one end is used for being in butt joint with the pipe orifice of the ultrasonic flowmeter (1), and the other end can be embedded into the corresponding variable diameter section (3), and the outer diameter of the straight pipe section (2) is larger than the minimum inner diameter of the corresponding variable diameter section (3) and smaller than the maximum inner diameter of the corresponding variable diameter section (3).
2. A calibration device for an ultrasonic flow meter according to claim 1, characterized in that each gas-introducing tube (6) is coaxial with the variable-diameter section (3) thereon;
the device also comprises a driving assembly (9), wherein the two air guide pipes (6) are coaxially arranged on the driving assembly (9) in a mode that the outer ends of the two reducing sections (3) are opposite, and the driving assembly (9) can drive the two air guide pipes (6) to move in opposite directions and move in opposite directions.
3. The calibrating device for the ultrasonic flowmeter according to claim 1, wherein a sealing ring (4) is further provided on one end of the straight pipe section (2) for abutting against the reducing section (3), and the sealing ring (4) is detachably mounted on the straight pipe section (2).
4. A calibration device for an ultrasonic flowmeter according to claim 3, wherein a first annular groove (41) coaxial with the sealing ring (4) is arranged at one end of the sealing ring (4), a second annular groove (42) coaxial with the straight pipe section (2) is arranged on the end face of the straight pipe section (2), a first annular bulge (43) is formed between the first annular groove (41) and the inner wall of the sealing ring (4), a second annular bulge (44) is formed between the second annular groove (42) and the outer wall of the straight pipe section (2), the first annular bulge (43) is embedded in the second annular groove (42), and the second annular bulge (44) is embedded in the first annular groove (41);
the corner (45) at the outer side of the outer end of the sealing ring (4) is an arc chamfer.
5. The calibration device for an ultrasonic flow meter according to claim 1, characterized in that each straight pipe section (2) is provided with a support assembly (11) for supporting the straight pipe section (2);
the support assembly (11) comprises a supporting rod (14) with the top end height adjustable, a supporting plate (16) connected to the supporting rod (14) and antifriction strips (17) arranged on the supporting plate (16);
the support plate (16) is a linear arc-shaped plate, the antifriction strips (17) are multiple and are arranged on the side surface of the concave side of the support plate (16) at intervals along the circumferential direction of the support plate (16), and the antifriction strips (17) are parallel to the support plate (16);
When the support assembly (11) supports the straight pipe joint (2), the straight pipe joint (2) is supported on the concave side of the support plate (16) through the wear reducing bars (17), and each wear reducing bar (17) is contacted with the outer wall of the straight pipe joint (2).
6. The calibration device for an ultrasonic flow meter according to claim 5, characterized in that the support plate (16) is detachably connected to the top end of the strut (14) by means of a connecting seat (15);
the connecting seat (15) is fixed on the outer convex side of the supporting plate (16) and is positioned in the middle of the arc length direction of the supporting plate (16), an internal threaded hole is formed in the connecting seat (15), and when an orifice of the internal threaded hole faces to the right lower side, the concave side of the supporting plate (16) faces to the right upper side;
the upper end of the supporting rod (14) is provided with an external thread section and a positioning shaft shoulder, the supporting rod (14) is in threaded connection with the internal thread hole through the external thread section, and the bottom surface of the connecting seat (15) is attached to the positioning shaft shoulder.
7. The calibration device for an ultrasonic flow meter according to claim 1, further comprising an air source assembly (13), an air supplementing pipe (8) and a circulating pump (7);
the air source assembly (13) comprises a surge tank, two air supplementing pipes (8) which are communicated with the surge tank are connected to the surge tank, one air supplementing pipe (8) is connected and communicated with one straight pipe section (2), and the other air supplementing pipe (8) is connected and communicated with the other straight pipe section (2);
The circulating pump (7) is connected in series between any air supplementing pipe (8) and the pressure stabilizing tank or connected in series on any air supplementing pipe (8), and the circulating pump (7) is used for driving fluid to enter the pressure stabilizing tank from the air supplementing pipe (8) or enter the air supplementing pipe (8) from the pressure stabilizing tank.
8. The calibration device for an ultrasonic flow meter according to claim 7, further comprising heating means for heating the fluid in the surge tank and/or in the air supply pipe (8).
9. The calibration device for an ultrasonic flow meter according to any one of claims 1 to 8, wherein at least one straight pipe section (2) is provided with a sensor (12), said sensor (12) being adapted to measure the temperature and the pressure of the fluid in the straight pipe section (2).
10. A calibration method for an ultrasonic flow meter, characterized in that the method employs a calibration device according to any one of claims 1 to 9 for calibrating an ultrasonic flow meter, in particular:
s1, completing connection of the calibration device and the ultrasonic flowmeter (1), wherein each air guide pipe (6) is connected with a corresponding pipe orifice of the ultrasonic flowmeter (1) through a straight pipe joint (2), and aiming at any straight pipe joint (2), the inner diameter of the straight pipe joint (2) is consistent with the inner diameter of the corresponding pipe orifice, and the other end of the straight pipe joint (2) is in butt joint with a reducing section (3) on the corresponding air guide pipe (6);
S2, calibrating the ultrasonic flowmeter (1) by utilizing the air guide pipe (6), wherein, relative to the ultrasonic flowmeter (1), the air flow for calibration is provided for the ultrasonic flowmeter (1) in a mode that one air guide pipe (6) is used as an air inlet pipe and the other air guide pipe (6) is used as an air outlet pipe, and the flow calibration of the ultrasonic flowmeter (1) is completed by comparing the relation between the flow value of the ultrasonic flowmeter (1) and the flow value of the provided air flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310398043.9A CN116337190A (en) | 2023-04-14 | 2023-04-14 | Calibration device and method for ultrasonic flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310398043.9A CN116337190A (en) | 2023-04-14 | 2023-04-14 | Calibration device and method for ultrasonic flowmeter |
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| CN116337190A true CN116337190A (en) | 2023-06-27 |
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| CN202310398043.9A Pending CN116337190A (en) | 2023-04-14 | 2023-04-14 | Calibration device and method for ultrasonic flowmeter |
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| Country | Link |
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