CN108981970B - Automatic calibration system of metering device - Google Patents
Automatic calibration system of metering device Download PDFInfo
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- CN108981970B CN108981970B CN201810306988.2A CN201810306988A CN108981970B CN 108981970 B CN108981970 B CN 108981970B CN 201810306988 A CN201810306988 A CN 201810306988A CN 108981970 B CN108981970 B CN 108981970B
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K19/00—Testing or calibrating calorimeters
Abstract
The invention discloses an automatic calibration system of a metering device, which comprises: the system comprises a liquid storage tank, a variable-frequency speed-regulating water pump communicated with the liquid storage tank, a pressure stabilizing tank communicated with the variable-frequency speed-regulating water pump, a standard flowmeter to be calibrated communicated with a liquid outlet end of the pressure stabilizing tank, and a metering tank communicated with the liquid storage tank; the commutator is arranged among the standard flowmeter to be calibrated, the metering tank and the liquid storage tank; the central control system comprises a central controller, and a mass acquisition unit, a liquid level acquisition unit, a flow acquisition unit and a commutator reversing unit which are connected with the central controller, wherein the central controller controls the mass acquisition unit to acquire the mass reading of the electronic scale, controls the liquid level acquisition unit to acquire the liquid level of fluid in the metering tank, and controls the flow acquisition unit to acquire the flow of the standard flowmeter to be calibrated; a timer. The invention has the advantages of automatically acquiring data calibration operation, improving working efficiency, reducing errors caused by manual operation errors to the maximum extent and guaranteeing the accuracy of the metering device.
Description
Technical Field
The invention relates to the technical field of metering device equipment. More particularly, the present invention relates to an automatic calibration system for a metering device.
Background
The calorimeter is a measuring instrument for measuring the heat released by hot water in a heat exchange loop and consists of a hot water flow sensor, two temperature sensors and a calculator. The flow sensor sends out a flow signal, the temperature sensor sends out temperature signals of water supply and water return, the calculator collects the flow signal and the temperature signal, the heat value released by the heat-carrying liquid from an inlet to an outlet is displayed through calculation, and in order to ensure the accuracy of measurement, the heat meter calibration mode specified in the national metrological calibration regulation-heat energy meter (JJG225-2001) comprises first calibration, subsequent calibration, in-service inspection, sizing identification and prototype test, and the calibration method comprises a total amount calibration method and a component calibration method. The device for calibrating the calorimeter is a metering device, meanwhile, the metering device needs to be calibrated to ensure the accuracy of self detection data, the calibration is carried out according to the verification regulation of the JJJG 643-2003 standard meter method flow standard device and the verification regulation of the JJG164-2000 liquid flow standard device published by the State administration of quality supervision, inspection and quarantine, on the basis of meeting the verification regulation standards, the problems that how to automatically obtain the data required by the calibration and improve the working efficiency are urgently solved at present are solved, wherein in the process of using the weighing method, the corresponding balance reading needs to be obtained, how to quickly obtain the accurate balance reading is solved, the reading error caused by the instability of water flow in the metering tank is effectively avoided, and the problem which needs to be solved at present is also urgently solved.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
Still another object of the present invention is to provide an automatic calibration system for a metering device, which automatically obtains data calibration operations, improves work efficiency, minimizes errors caused by human operation errors, and provides a guarantee for the accuracy of the metering device.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a metering device automatic calibration system including: the device comprises a liquid storage tank, a variable-frequency speed-regulating water pump communicated with the liquid outlet end of the liquid storage tank, a pressure stabilizing tank communicated with the liquid outlet end of the variable-frequency speed-regulating water pump, a standard flowmeter to be calibrated communicated with the liquid outlet end of the pressure stabilizing tank, and a metering tank communicated with the liquid inlet end of the liquid storage tank, wherein the metering tank is placed on an electronic scale;
the commutator is arranged among the standard flowmeter to be calibrated, the metering tank and the liquid storage tank so as to switch the fluid passing through the standard flowmeter to the metering tank or the liquid storage tank;
the central control system comprises a central controller, a mass acquisition unit, a liquid level acquisition unit, a flow acquisition unit and a commutator reversing unit, wherein the mass acquisition unit, the liquid level acquisition unit, the flow acquisition unit and the commutator reversing unit are connected with the central controller;
and the timer is connected with the central controller, and the central controller controls the start and stop of the timer so as to measure the calibration start-stop time.
Preferably, the automatic calibration system for a metering device further includes: the flow speed regulation control system comprises a frequency converter electrically connected with the variable-frequency speed regulation water pump, an alternating current contactor and a power switch which are sequentially connected in series on a power supply line of the frequency converter, wherein a central controller is electrically connected with the frequency converter to control the frequency converter to drive the variable-frequency speed regulation water pump, and the central controller is electrically connected with the alternating current contactor to control the on-off of a power supply of the frequency converter.
Preferably, a liquid outlet of the commutator above the metering tank is vertically communicated with a liquid outlet pipe towards the metering tank, the metering tank is cylindrical, a bottom plate with a V-shaped longitudinal section and a hollow guide plate are clamped at the inner lower part of the metering tank from top to bottom, a strip-shaped liquid outlet is arranged at the lowest end of the bottom plate, the guide plate comprises two branch cavities with top ends connected in an inverted V shape, the liquid outlet is communicated with the top end of the guide plate, the included angle between one branch cavity and the horizontal plane is slightly smaller than that of the other branch cavity, the side wall of the lowest end of the metering tank connected with the two branch cavities is provided with a flow guide port communicated with the guide plate, the two flow guide ports are communicated with a flow guide pipe, the flow guide pipe communicated with the lower flow guide port is smoothly transited to the other flow guide pipe and;
the spray head is cylindrical and communicated with the liquid outlet pipe, the bottom end of the spray head is conical and is coaxial with the liquid outlet pipe, 8 partition plates are circumferentially arranged in the spray head in an equal included angle mode so as to divide the space in the spray head into eight liquid distribution chambers with equal volume, a first speed reduction layer and a second speed reduction layer are horizontally and vertically clamped at intervals in each liquid distribution chamber, the first speed reduction layer comprises a first support net and a plurality of inverted circular truncated cone-shaped springs, the first support net is vertically arranged at intervals, the inverted circular truncated cone-shaped springs are arranged between the upper first support net and the lower first support net at intervals, a paddle is coaxially and fixedly arranged in each spring, the second speed reduction layer comprises two second support nets and sand grains filled in the two second support nets, the liquid outlet pipe, the spray head and the metering tank are coaxially arranged, the transverse section radius of the spray head is equal to the half of the sum of the transverse section radius of the metering tank and the transverse section radius of the liquid outlet pipe, the height of the top end of the partition plate is slightly lower than that of the top end of the spray head, the top end of the spray head is provided with a vent valve, and the distance ratio of the top end of the first speed reduction layer, the top end of the second speed reduction layer and the lowest end of the spray head to the top end of the spray head is 2:3: 4;
the measuring tank comprises a measuring tank, a hopper, a plurality of branch pipes, a plurality of hopper pipes, a plurality of serpentine pipes, a plurality of hopper pipes and a plurality of hopper pipes, wherein 8 serpentine pipes are vertically arranged on the inner side wall of the measuring tank at equal intervals in the circumferential direction, an included angle between each branch pipe body of each serpentine pipe and a horizontal plane is 6 degrees, each pair of branch pipe bodies of each serpentine pipe, which are positioned on two sides of the central axis of the measuring tank;
the bottom end of each liquid separating cavity is communicated with a fan-shaped pipe, the included angle between each fan-shaped pipe and the horizontal plane is 2 degrees, the liquid outlet end of each fan-shaped pipe is smoothly and downwards bent and is positioned right above each material receiving hopper in a one-to-one correspondence mode.
Preferably, a strain type resistance sensor is arranged in the electronic scale, the strain type resistance sensor outputs an analog electric signal to the metering acquisition unit, and the mass acquisition unit converts the analog signal into a standard signal of the mass reading of the electronic scale and then transmits the standard signal to the central controller.
Preferably, the automatic calibration system for a metering device further includes: and the external crystal oscillator input port of the standard timer is connected with the timer so as to receive the crystal oscillator output signal of the timer and output an error value to be sent to the central controller.
Preferably, the automatic calibration system for a metering device further includes: the comparison standard flowmeter is communicated and arranged between the standard flowmeter to be calibrated and the commutator;
and one end of the flow changing pipe is communicated with a pipe body positioned between the comparison standard flowmeter and the standard flowmeter, the other end of the flow changing pipe is communicated with a pipe body positioned between the comparison standard flowmeter and the reverser, and valves are arranged on pipelines between the comparison standard flowmeter and the reversing pipe close to one end of the flowmeter to be calibrated.
Preferably, the automatic calibration system for a metering device further includes: a temperature sensor and a pressure sensor both in communication with the central controller;
the temperature sensor is arranged on a pipeline between the flowmeter to be calibrated and the pressure stabilizing tank so as to detect a temperature signal of fluid in the pipeline and transmit the temperature signal to the central controller;
the pressure sensor is arranged on a pipeline between the flowmeter to be calibrated and the flow exchanging pipe so as to detect a fluid pressure signal in the pipeline and transmit the fluid pressure signal to the central controller.
The invention at least comprises the following beneficial effects:
firstly, in the tests of electronic scale detection, automatic calibration of a standard flowmeter to be calibrated, flow stability detection and commutator detection, according to the calibration rules of a JJG164-2000 liquid flow standard device and the relevant regulations of the calibration rules of the JJG164-2000 standard meter method flow standard device, the data required by the electronic scale detection, the automatic calibration of the standard flowmeter to be calibrated, the flow stability detection and the commutator detection are automatically acquired, so that the calibration operation of automatic data acquisition is realized, the working efficiency can be improved, the errors caused by manual operation errors can be reduced to the maximum extent, and the accuracy of a metering device is guaranteed.
And secondly, the structural arrangement of the spray head and the metering tank reduces the degree of the balance reading influenced by the water flow impact force, even eliminates the influence of the water flow impact force, so that the reading of the balance at any moment in the time period of the commutator changing in and out can be used as a reference standard, the reliability of the data of the whole device is improved, and the required stabilization time of the balance reading is effectively shortened.
And thirdly, the standard flowmeter is set and compared, so that the problems of drifting and the like of the standard flowmeter to be calibrated in the time interval of two times of detection are avoided, and the standard flowmeter to be calibrated can be conveniently and timely found in the detection process when the problems occur.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a flow chart of an automatic calibration system of a metering device according to one embodiment of the present invention;
FIG. 2 is a flow chart of an automatic calibration system of a metering device according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a metering tank according to one embodiment of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 to 3, the present invention provides an automatic calibration system for a metering device, comprising:
the device comprises a liquid storage tank, a variable-frequency speed-regulating water pump communicated with the liquid outlet end of the liquid storage tank, a pressure stabilizing tank communicated with the liquid outlet end of the variable-frequency speed-regulating water pump, a standard flowmeter to be calibrated communicated with the liquid outlet end of the pressure stabilizing tank, and a metering tank 2 communicated with the liquid inlet end of the liquid storage tank, wherein the metering tank 2 is placed on an electronic scale 7, and the electronic scale 7 is used for weighing the weight of the metering tank 2;
the commutator is arranged among the standard flowmeter to be calibrated, the metering tank 2 and the liquid storage tank so as to switch the fluid passing through the standard flowmeter to the metering tank 2 or the liquid storage tank;
the central control system comprises a central controller, a mass acquisition unit, a liquid level acquisition unit, a flow acquisition unit and a commutator reversing unit, wherein the mass acquisition unit, the liquid level acquisition unit, the flow acquisition unit and the commutator reversing unit are connected with the central controller;
and the timer is connected with the central controller, and the central controller controls the start and stop of the timer so as to measure the calibration start-stop time.
In the technical scheme, a liquid storage tank is communicated with a variable-frequency speed-regulating water pump, a variable-frequency speed-regulating water pump and a pressure stabilizing tank, a pressure stabilizing tank is communicated with a commutator, a metering tank 2 is communicated with the liquid storage tank, the commutator and the liquid storage tank are communicated through pipelines, valves can be arranged on the pipelines according to actual requirements, a standard flowmeter to be calibrated is arranged on the pipeline between the pressure stabilizing tank and the commutator, the working principle of the commutator is similar to a three-way valve, water flow is controlled to be switched between the liquid storage tank and the metering tank 2 through a pneumatic device, a photoelectric sensor is arranged in the commutator and used for measuring the actual reversing action time of the commutator and transmitting the actual reversing action time to a central controller, the bottom end of the metering tank 2 is connected with a valve to drain the fluid in the metering tank 2, the display screen is further included, the central controller performs data interaction with the display screen through a parallel data transmission mode, and the central controller and the display screen are part of an upper computer, an operator controls an upper computer to realize a human-computer interaction function, and the using process comprises (1) electronic scale detection; (2) automatically calibrating a standard flowmeter to be calibrated; (3) detecting flow stability; (4) detecting a commutator;
wherein, (1) the electronic scale detects;
the electronic scale is used as a weighing apparatus of the calibrating device, the electronic scale needs to be calibrated periodically according to the requirement regulation in the calibration regulation, the conventional detection process of the electronic scale is basically carried out according to the method in the calibration regulation, and the weighing data of the electronic scale 7 are transmitted to the central controller through the mass acquisition unit every time, the method is as follows:
at least 10 uniformly distributed points (j is 1,2,3, m, m is more than or equal to 10) are taken in the using amount range of the electronic scale 7, and a standard weight is used for gradually loading the points from j to 1 to j to m to finish the first verification; gradually unloading from j to m to j to 1 to finish the second verification, respectively recording the loading mass (the weight of the total standard weight placed on the balance when each point is recorded), the unloading mass (the total weight unloaded when each point is recorded) and the reading of the electronic scale, and repeating the operation n (n is more than or equal to 10) times;
manually inputting loading quality and unloading quality through a display screen of the upper computer and storing the loading quality and the unloading quality into the central controller, and transmitting related data to the central controller through a quality acquisition unit by reading of the electronic scale 7;
(2) automatically calibrating a standard flowmeter to be calibrated;
determining that no liquid remains in the metering tank 2, enabling meters (an electronic scale and a standard flowmeter to be calibrated) to return to zero, switching out a commutator (the commutator is communicated with the standard flowmeter to be calibrated and a liquid storage tank), starting a variable-frequency speed-regulating water pump communicated with the standard flowmeter to be calibrated, regulating a flow rate, after the flow rate is stabilized, switching in the commutator (the commutator is communicated with the standard flowmeter to be calibrated and the metering tank 2), running for a period of time, switching out (the reading of the balance is controlled between the total scale range 1/3 and 1/2 in the time period of switching out and switching in), recording the switching-in and switching-out running time of the commutator, the reading of the standard flowmeter to be calibrated, the reading of the balance → emptying liquid in the metering tank 2, and then closing → repeating for at;
the central controller controls the commutator to be switched in and out within a certain time through the commutator reversing unit, the photoelectric sensor in the commutator measures the actual reversing action time of the commutator and transmits the actual reversing action time to the central controller for recording, the flow acquisition unit acquires the meter reading of the standard flow meter to be calibrated and transmits the meter reading to the central controller, and the corresponding electronic scale 7 reading transmits related data to the central controller through the quality acquisition unit;
(3) detecting flow stability;
in the detection process of the heat meter, the flow needs to be kept to operate stably for a period of time, and the metering device needs to meet the detection experiment of the flow stability, and the method specifically comprises the following steps:
(31) determination of flow stability within cumulative time
Determining that no liquid remains in the metering tank 2, enabling meters (an electronic scale and a standard flowmeter to be calibrated) to return to zero, switching out a commutator (the commutator is communicated with the standard flowmeter to be calibrated and a liquid storage tank), starting a variable-frequency speed-regulating water pump communicated with the standard flowmeter to be calibrated, a pressure stabilizing tank, regulating flow, after the flow is stabilized, switching in the commutator (the commutator is communicated with the standard flowmeter to be calibrated and the metering tank 2), operating for a period of time, switching out the commutator (about the total range of the balance 1/3-1/2) → continuously recording output signals q of the reaction flow in the same time interval during the switching-in and switching-out operation time1i(i＝1,2,3，…，n；n≥60)；
(32) Flow stability verification between accumulation times
Determining that no liquid remains in the metering tank 2, enabling meters (an electronic scale and a standard flowmeter to be calibrated) to return to zero, switching out a commutator (the commutator is communicated with the standard flowmeter to be calibrated and a liquid storage tank), starting a variable-frequency speed-regulating water pump communicated with the standard flowmeter to be calibrated, regulating a flow rate, stabilizing the flow rate, switching in the commutator (the commutator is communicated with the standard flowmeter to be calibrated and the metering tank 2), operating for a period of time, switching out (about the total balance range 1/3-1/2), recording the switching-in and switching-out operating time of the commutator, the reading of the standard flowmeter to be calibrated, the reading of the balance → closing after emptying liquid in the metering tank 2 → repeating for at least 10 times;
(4) detecting a commutator;
in a weighing method detection experiment, the weighing mass of the electronic scale is used as a standard value to be compared with a meter to be measured (a standard flowmeter to be calibrated), and signal synchronization and waterway switching between the meter to be measured (the standard flowmeter to be calibrated) and the electronic scale are completed by means of a commutator. Two methods are used for the detection experiment of the commutator, wherein the flow meter method needs to be carried out according to the following steps: determining that no liquid is left in the measuring tank 2, enabling meters (an electronic scale and a standard flowmeter to be calibrated) to return to zero, switching out a commutator (the commutator is communicated with the standard flowmeter to be calibrated and a liquid storage tank), starting a variable-frequency speed-regulating water pump communicated with the standard flowmeter to be calibrated, regulating the flow, after the flow is stabilized, switching in the commutator (the commutator is communicated with the standard flowmeter to be calibrated and the measuring tank 2) for a period of time, switching out (about the total balance range 1/3-1/2), recording the running time of the commutator between switching in and switching out, the reading of the flow meter, the reading of the balance (after the numerical value is stabilized), opening a bottom valve of a container, emptying → closing a bottom valve of the container → clearing the balance (after the flow is stabilized), switching in and switching out 10 times (controlling the balance to be full of the total balance 1/3-1/2), recording the total running time of the commutator between switching in and switching out, balance reading (after numerical value stabilization) → opening the container bottom valve for emptying → closing the container bottom valve → repeating the above steps 10 times → stopping the pump and closing the valve. By adopting the technical scheme, in the tests of electronic scale detection, automatic calibration of a standard flowmeter to be calibrated, flow stability detection and commutator detection, according to the calibration regulation of the JJJG 164-2000 liquid flow standard device and the relevant regulation of the calibration regulation of the JJG164-2000 standard meter method flow standard device, the data required by the electronic scale detection, the automatic calibration of the standard flowmeter to be calibrated, the flow stability detection and the commutator detection are automatically obtained, and then the sub-detection result and the total detection result are determined according to the relevant regulation and a calculation mode, so that the automatic calibration operation is realized, the working efficiency is improved, the errors caused by manual operation errors can be reduced to the maximum extent, and the accuracy of the metering device is guaranteed.
In another technical solution, the automatic calibration system for a metering device further includes: the flow speed regulation control system comprises a frequency converter electrically connected with the variable-frequency speed regulation water pump, an alternating current contactor and a power switch which are sequentially connected in series on a power supply line of the frequency converter, wherein a central controller is electrically connected with the frequency converter to control the frequency converter to drive the variable-frequency speed regulation water pump, and the central controller is electrically connected with the alternating current contactor to control the on-off of a power supply of the frequency converter. By adopting the scheme, the power switch is turned on to electrify the variable-frequency speed-regulating water pump, the frequency converter outputs three-phase electric drive with variable frequency to regulate the variable-frequency speed-regulating water pump, the central controller is electrically connected with the alternating-current contactor to control the on-off of the power supply, and meanwhile, the central controller can control the frequency converter to regulate the flow rate of the variable-frequency speed-regulating water pump so as to realize the on-off of the power supply of the variable-frequency speed-regulating water pump and the.
In another technical solution, a liquid outlet 210 of the diverter above the metering tank 2 is vertically downward communicated with a liquid outlet pipe 1 towards the metering tank 2, the metering tank 2 is cylindrical, a bottom plate 21 with a V-shaped longitudinal section is clamped at the inner lower part of the metering tank from top to bottom (the bottom plate 21 is symmetrically arranged relative to a vertical plane of a central axis of the cylinder, the longitudinal section is a plane vertical to the vertical plane), and a hollow flow guide plate 22, the lowest end of the bottom plate 21 is provided with a strip-shaped liquid outlet 210 along the length direction thereof, the flow guide plate 22 comprises two branch cavities 220 (the chord is a straight arc), the two branch cavities 220 are positioned at two sides of the vertical plane, the liquid outlet 210 is communicated with the top end of the flow guide plate 22, so that the upper cavity of the metering tank 2 is communicated with the flow guide plate 22, the included angle between one branch cavity 220 and the horizontal plane is slightly smaller than the other branch cavity 220, the side wall of the lowest end of the metering tank 2 connected with the two branch cavities 220 is provided with a diversion port 23 communicated with the diversion plate 22 to lead out the fluid in the branch cavities 220, the two diversion ports 23 are communicated with a diversion pipe 24, the diversion pipe 24 communicated with the lower diversion port 23 (of the other branch cavity 220) is in smooth transition (the lower diversion port 23 and the other diversion pipe 24 are connected with a certain gradient) to the other diversion pipe 24 and is communicated with the other diversion pipe 24, the other diversion pipe 24 is arranged between the diversion pipe 24 communicated with the other diversion pipe 24 and the liquid outlet end of the other diversion pipe and is provided with a switch valve 25, wherein the switch valve 25 is controlled to close after the liquid in the metering tank 2 is emptied;
the spray head is cylindrical and is communicated with the liquid outlet pipe 1, the bottom end of the spray head 3 is conical and is coaxially arranged with the liquid outlet pipe 1, 8 partition plates 30 are circumferentially arranged in the spray head 3 in an equal included angle mode so as to divide the space in the spray head 3 into eight liquid distribution cavities 31 with equal volume, a first speed reduction layer 4 and a second speed reduction layer 5 are horizontally and vertically clamped in each liquid distribution cavity 31 at intervals, the first speed reduction layer 4 comprises a first support net 40 and a plurality of inverted circular truncated cone-shaped springs 41, the first support net 40 is vertically arranged at intervals, the inverted circular truncated cone-shaped springs 41 are arranged between the upper support net 40 and the lower support net 40 at intervals, a paddle is coaxially and fixedly arranged in each spring 41, the second speed reduction layer 5 comprises two second support nets 50 and sand grains 51 filled in the two second support nets 50, the liquid outlet pipe 1, the spray head 3 and the metering tank 2 are coaxially arranged, and the transverse section radius of the spray head 3 is equal to the transverse section radius of the metering tank 2 and the transverse section radius of the liquid outlet pipe 1 The radius of the cross section is half of the sum of the radius of the cross section, the height of the top end of the partition plate 30 is slightly lower than the height of the top end of the spray head 3, the top end of the spray head 3 is provided with a vent valve 32, the distance ratio of the top end of the first speed reduction layer 4, the top end of the second speed reduction layer 5 and the distance between the lowest end of the spray head 3 and the top end of the spray head 3 is 2:3:4, the spray head 3 and the liquid outlet pipe 1 can be detachably connected through screw connection, one end face, close to the axis of the spray head 3, of the fast partition plate 30 8 is parallel to and coincided with the axis of the spray head 3, the first speed reduction layer 4 and the second speed reduction layer 5 are in a fan;
the measuring tank 2 is characterized in that 8 coiled pipes (which are composed of a plurality of W-shaped pipe bodies which are repeated up and down) are vertically arranged on the inner side wall of the measuring tank 2 at equal intervals in the circumferential direction, an included angle between each branch pipe body (one pipe body between any two adjacent corners) of each coiled pipe and the horizontal plane is 6 degrees, each pair of branch pipe bodies, located at the same height, of each coiled pipe on the two sides of the central axis of the measuring tank 2 incline towards opposite directions, and a material receiving hopper 20 is arranged at the top end of each coiled pipe;
the bottom end of each liquid distribution cavity 31 is communicated with a fan-shaped pipe 6, the included angle between each fan-shaped pipe 6 and the horizontal plane is 2 degrees, the liquid outlet end of each fan-shaped pipe 6 is arranged in a mode of being bent downwards in a sliding mode, and the fan-shaped pipes are located right above each material receiving hopper 20 in a one-to-one correspondence mode. By adopting the scheme, water flow is cut into the metering tank 2 after passing through the commutator, at the moment, the water flow reaches the top end of the spray head 3 through the end part of the liquid outlet pipe 1, the vertical water flow is divided into 8 parts by 8 partition plates 30 and flows to different liquid distribution cavities 31 respectively, the fluid reaching the liquid distribution cavities 31 reaches the first speed reduction layer 4, one part of the downward thrust of the fluid is converted into the rotating force of the paddle to reduce the fluid speed, the first speed reduction layer 4 is arranged to reduce the overall fluid passing capacity (the capacity of the fluid passing through the first speed reduction layer 4 per second is larger than the throughput of the fluid not reduced in the liquid outlet pipe 1 per second), meanwhile, the fluid achieves the effect of more uniformly dispersing the fluid in the liquid distribution cavities 31 through the rotation of the paddle, the dispersed fluid continues to reach the second speed reduction layer 5 downwards, the sand 51 is further dispersed fluid and reduces the fluid speed, and the arrangement of the sizes of the sand 51 meets the condition that the capacity of the fluid passing through the second speed reduction layer 5 per second is larger than the capacity of the fluid not reduced The flow of the fast fluid per second is measured so as to avoid the accumulation of the fluid in the spray head 3, the fluid reaches the fan-shaped pipes 6 and then reaches the position right above the receiving hopper 20 through the fan-shaped pipes 6, the diameter of the liquid outlet end of each fan-shaped pipe 6 is larger than 1/4 of the diameter of the liquid outlet pipe 1, so that the decelerated fluid does not have excessive time in the liquid outlet pipe 1, namely the fluid with the same volume flowing through the liquid outlet pipe 1 per second can be discharged in one second basically under the action of the gravity inclination angle of the fan-shaped pipes 6, the water reaching the receiving hopper 20 is injected into the metering tank 2 through the coil pipes, the water flows downwards under the action of the gravity of the coil pipes, the gravity is divided into a horizontal force and a vertical force, the horizontal forces of the two coil pipes positioned on two sides of the central axis of the metering tank 2 are mutually counteracted, the vertical force continuously drives the water to move downwards, so that the water flows in the falling process, the impact force of water flow on the metering tank 2 is avoided, so that the degree of influence of the water flow impact force on the scale reading is reduced in the time period between the switching-in and the switching-out, even the influence of the water flow impact force is eliminated, the scale reading at any moment in the time period of switching-in and switching-out of the commutator can be used as a reference standard, the reliability of data of the whole device is improved, and the stability time required by the scale reading is effectively shortened.
In another technical scheme, a strain type resistance sensor is arranged in the electronic scale 7, the strain type resistance sensor outputs an analog electric signal to a metering acquisition unit, and the mass acquisition unit converts the analog signal into a standard signal of electronic scale mass reading and then transmits the standard signal to a central controller. The scheme is adopted to realize the automatic acquisition of the reading of the electronic scale 7.
In another technical solution, the automatic calibration system for a metering device is characterized by further comprising: and the external crystal oscillator input port of the standard timer is connected with the timer so as to receive the crystal oscillator output signal of the timer and output an error value to be sent to the central controller. The scheme is adopted for calibrating the timer, the calibration of the timer mainly comprises two steps, firstly, the stability of the crystal oscillator of the timer is detected for 8h → the crystal oscillator output signal of the timer is connected to the external crystal oscillator input port of the standard timer, the timer is connected with an external power supply, after the timer is preheated for 1h, the standard timer receives the crystal oscillator output signal of the timer every 1h, and the error values of the standard timer and the timer are output to the central controller; and secondly, calibrating time intervals → controlling a standard timer and the timer to synchronously start and stop by taking the shortest measuring time of one calibration as a time interval, recording the value of the timer and the value of the standard timer, completing one calibration, repeating the calibration for more than 10 times, and calculating according to the obtained data result and the related regulations of the calibration procedure of the JJG164-2000 liquid flow standard device and the calibration procedure of the JJG164-2000 standard meter method flow standard device to obtain the calibration result of the timer.
In another technical solution, as shown in fig. 2, the automatic calibration system for a metering device further includes: the comparison standard flowmeter is communicated and arranged between the standard flowmeter to be calibrated and the commutator;
and one end of the flow changing pipe (shown in figure 2) is communicated with the pipe body positioned between the comparison standard flowmeter and the standard flowmeter, the other end of the flow changing pipe is communicated with the pipe body positioned between the comparison standard flowmeter and the reverser, and valves (not shown in figure 2) are arranged on the flow changing pipe and a pipeline positioned between the comparison standard flowmeter and the reversing pipe close to one end of the flowmeter to be calibrated. By adopting the scheme, the detection period of the standard flowmeter to be calibrated in the calibration device is one year in the metering and calibrating rules, the comparison meter is added as a reference for avoiding the problems of drifting and the like of the standard flowmeter to be calibrated in the time interval of two detections, the standard flowmeter to be calibrated is convenient to find in time when the problems of the standard flowmeter to be calibrated occur in the detection process, the flow change pipe is set to provide more selectivity for the practicability of the whole device, and the test of unnecessary data is avoided.
In another technical solution, the automatic calibration system for a metering device further includes: a temperature sensor and a pressure sensor both in communication with the central controller;
the temperature sensor is arranged on a pipeline between the flowmeter to be calibrated and the pressure stabilizing tank so as to detect a temperature signal of fluid in the pipeline and transmit the temperature signal to the central controller;
the pressure sensor is arranged on a pipeline between the flowmeter to be calibrated and the flow exchanging pipe so as to detect a fluid pressure signal in the pipeline and transmit the fluid pressure signal to the central controller. With this approach, the effects of temperature and pressure on the test results are tightly controlled and monitored as specified by the metrological test protocol.
The automatic calibration system further comprises: the central controller calibrates all instruments and a total metering device according to test data and related regulations of a JJG164-2000 liquid flow standard device calibration procedure and a JJG164-2000 standard meter method flow standard device calibration procedure, if the calibration device has a certain working point drifting phenomenon, the instrument with a correction function can prolong the service cycle of the instrument through the self correction function of the instrument, but some instruments without the correction function can finish instrument correction through the instrument correction module.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the automatic calibration system of the metering device of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. An automatic calibration system for a metering device, comprising:
the device comprises a liquid storage tank, a variable-frequency speed-regulating water pump communicated with the liquid outlet end of the liquid storage tank, a pressure stabilizing tank communicated with the liquid outlet end of the variable-frequency speed-regulating water pump, a standard flowmeter to be calibrated communicated with the liquid outlet end of the pressure stabilizing tank, and a metering tank communicated with the liquid inlet end of the liquid storage tank, wherein the metering tank is placed on an electronic scale;
the commutator is arranged among the standard flowmeter to be calibrated, the metering tank and the liquid storage tank so as to switch the fluid passing through the standard flowmeter to the metering tank or the liquid storage tank;
the central control system comprises a central controller, a mass acquisition unit, a liquid level acquisition unit, a flow acquisition unit and a commutator reversing unit, wherein the mass acquisition unit, the liquid level acquisition unit, the flow acquisition unit and the commutator reversing unit are connected with the central controller;
the timer is connected with the central controller, and the central controller controls the start and stop of the timer so as to measure the calibration start-stop time;
a liquid outlet of the commutator above the metering tank is vertically communicated with a liquid outlet pipe towards the metering tank, the metering tank is cylindrical, a bottom plate with a V-shaped longitudinal section and a hollow guide plate are clamped at the inner lower part of the metering tank from top to bottom, the lowest end of the bottom plate is provided with a strip-shaped liquid outlet, the guide plate comprises two branch cavities with two top ends connected in an inverted V shape, the liquid outlet is communicated with the top end of the guide plate, the included angle between one branch cavity and the horizontal plane is slightly smaller than that of the other branch cavity, the side wall of the lowest end of the metering tank connected with the two branch cavities is provided with a flow guide port communicated with the guide plate, the two flow guide ports are communicated with a flow guide pipe, the flow guide pipe communicated with the lower flow guide port is smoothly transited to the other flow;
the spray head is cylindrical and communicated with the liquid outlet pipe, the bottom end of the spray head is conical and is coaxial with the liquid outlet pipe, 8 partition plates are circumferentially arranged in the spray head in an equal included angle mode so as to divide the space in the spray head into eight liquid distribution chambers with equal volume, a first speed reduction layer and a second speed reduction layer are horizontally and vertically clamped at intervals in each liquid distribution chamber, the first speed reduction layer comprises a first support net and a plurality of inverted circular truncated cone-shaped springs, the first support net is vertically arranged at intervals, the inverted circular truncated cone-shaped springs are arranged between the upper first support net and the lower first support net at intervals, a paddle is coaxially and fixedly arranged in each spring, the second speed reduction layer comprises two second support nets and sand grains filled in the two second support nets, the liquid outlet pipe, the spray head and the metering tank are coaxially arranged, the transverse section radius of the spray head is equal to the half of the sum of the transverse section radius of the metering tank and the transverse section radius of the liquid outlet pipe, the height of the top end of the partition plate is slightly lower than that of the top end of the spray head, the top end of the spray head is provided with a vent valve, and the distance ratio of the top end of the first speed reduction layer, the top end of the second speed reduction layer and the lowest end of the spray head to the top end of the spray head is 2:3: 4;
the measuring tank comprises a measuring tank, a hopper, a plurality of branch pipes, a plurality of hopper pipes, a plurality of serpentine pipes, a plurality of hopper pipes and a plurality of hopper pipes, wherein 8 serpentine pipes are vertically arranged on the inner side wall of the measuring tank at equal intervals in the circumferential direction, an included angle between each branch pipe body of each serpentine pipe and a horizontal plane is 6 degrees, each pair of branch pipe bodies of each serpentine pipe, which are positioned on two sides of the central axis of the measuring tank;
the bottom end of each liquid separating cavity is communicated with a fan-shaped pipe, the included angle between each fan-shaped pipe and the horizontal plane is 2 degrees, the liquid outlet end of each fan-shaped pipe is smoothly and downwards bent and is positioned right above each material receiving hopper in a one-to-one correspondence mode.
2. The automatic calibration system for a metering device of claim 1, further comprising: the flow speed regulation control system comprises a frequency converter electrically connected with the variable-frequency speed regulation water pump, an alternating current contactor and a power switch which are sequentially connected in series on a power supply line of the frequency converter, wherein a central controller is electrically connected with the frequency converter to control the frequency converter to drive the variable-frequency speed regulation water pump, and the central controller is electrically connected with the alternating current contactor to control the on-off of a power supply of the frequency converter.
3. The automatic calibration system of a metering device according to claim 1, wherein a strain type resistance sensor is arranged in the electronic scale, the strain type resistance sensor outputs an analog electric signal to the metering acquisition unit, and the mass acquisition unit converts the analog electric signal into a standard signal of a mass reading of the electronic scale and then transmits the standard signal to the central controller.
4. The automatic calibration system for a metering device of claim 1, further comprising: and the external crystal oscillator input port of the standard timer is connected with the timer so as to receive the crystal oscillator output signal of the timer and output an error value to be sent to the central controller.
5. The automatic calibration system for a metering device of claim 1, further comprising: the comparison standard flowmeter is communicated and arranged between the standard flowmeter to be calibrated and the commutator;
and one end of the flow changing pipe is communicated with a pipe body positioned between the comparison standard flowmeter and the standard flowmeter, the other end of the flow changing pipe is communicated with a pipe body positioned between the comparison standard flowmeter and the reverser, and valves are arranged on pipelines between the comparison standard flowmeter and the reversing pipe close to one end of the flowmeter to be calibrated.
6. The automatic calibration system for a metering device of claim 5, further comprising: a temperature sensor and a pressure sensor both in communication with the central controller;
the temperature sensor is arranged on a pipeline between the flowmeter to be calibrated and the pressure stabilizing tank so as to detect a temperature signal of fluid in the pipeline and transmit the temperature signal to the central controller;
the pressure sensor is arranged on a pipeline between the flowmeter to be calibrated and the flow exchanging pipe so as to detect a fluid pressure signal in the pipeline and transmit the fluid pressure signal to the central controller.
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| CN112147282A (en) * | 2020-09-14 | 2020-12-29 | 北京航天试验技术研究所 | Concentration sensor calibration device and calibration method |
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| CN104776896B (en) * | 2015-03-30 | 2018-02-23 | 东南大学 | A kind of fluid flow instrument dynamic calibration system and method |
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Effective date of registration: 20210603 Address after: 100026 No.6 Liufang North Street, Chaoyang District, Beijing Patentee after: BEIJING DISTRICT HEATING Group Patentee after: Beijing Thermal Equipment Manufacturing Co.,Ltd. Address before: 6 Liufang North Street, Chaoyang District, Beijing 100028 Patentee before: BEIJING DISTRICT HEATING Group Patentee before: BEIJING WEIYE HEAT SUPPLY EQUIPMENT Co.,Ltd. |