CN207866395U - Flow control system for heat meter calibration - Google Patents

Abstract

The utility model provides a flow control system for calorie meter verification. The flow control system includes a constant pressure delivery unit, a multi-section test pipeline, a weighing unit and a control unit; the control unit is selected by automatically controlling the delivery valve. Frequency conversion pumps with different flow rates and weighing devices with different weighing weights can realize the verification of heat meters with different flow rates; the control unit realizes the automatic conversion between the quality method and the standard meter method through automatic control of the weighing valve, and realizes the quality verification method. The integrated operation with the standard meter test method improves the test efficiency; the control system also includes a remote transmission port, which can upload real-time operation data and historical data to the server through the Internet or GPRS, and realize remote monitoring through the PC or mobile phone. Function. The automatic verification control system provided by the utility model realizes the automation of the verification process, reduces the verification time, improves the verification efficiency, and is suitable for large-scale production and verification.

Description

Flow Control System for Calibration of Heat Meters

technical field

The utility model relates to a flow control system, in particular to a flow control system used for heat meter verification.

Background technique

The heat meter's measurement of flow, temperature and heat energy calculation will have a great impact on the accuracy of heat energy measurement; Measurement accuracy, temperature measurement accuracy, and thermal energy calculation accuracy, etc.; therefore, heat meters usually undergo flow verification, temperature verification, and calculation method verification before leaving the factory or during maintenance.

Flow verification has two verification methods: comparison method (standard table method) and weighing method (mass method). Compared with the flowmeter of the heat meter to be verified, the two methods usually require the use of two sets of devices, occupying space on the site, and part of the process requires manual operation, resulting in low detection efficiency.

Utility model content

In order to solve the deficiencies of the prior art above, the purpose of this utility model is to provide a flow control system for calorimeter verification, so as to overcome the defects in the prior art.

In order to achieve the above purpose, the utility model provides a flow control system for calorimeter verification, the flow control system includes: a voltage stabilizing delivery unit, a multi-section test pipeline, a weighing unit and a control unit; wherein, the voltage stabilizing The delivery unit includes a constant temperature water tank and two parallel stabilized pressure delivery pipelines. The water outlet of the constant temperature water tank is connected with the two parallel stabilized pressure delivery pipelines. Up to multiple test pipelines; among them, one stable pressure delivery pipeline is composed of the first control valve, the first variable frequency pump, the first pressure regulator tank and the first pressure transmitter connected in series, and the other stable pressure delivery pipeline is sequentially connected It is composed of the second control valve, the second frequency conversion pump, the second surge tank and the second pressure transmitter connected in series; the first control valve, the second control valve, the first frequency conversion pump, the second frequency conversion pump, the first pressure The transmitter and the second pressure transmitter are respectively electrically connected to the control unit; the multi-section test pipeline is composed of multiple single-section test pipelines connected in parallel, and each section of the test pipeline is provided with a flowmeter to be tested and a standard electromagnetic flowmeter in turn; the multi-section test A first temperature sensor and a second temperature sensor are also respectively arranged on the inlet and outlet pipelines of the pipeline, which are respectively used to measure the water temperature at the inlet and outlet of the test pipeline; the flow meter to be tested, the standard electromagnetic flowmeter, the first temperature sensor and the The second temperature sensors are all electrically connected to the control unit; the weighing unit includes a parallel first weighing device and a second weighing device, and the constant temperature water enters the first weighing device and the second weighing device respectively through the water outlet of the multi-section test pipeline through the steering valve. The second weighing device, the water outlets of the first weighing device and the second weighing device are respectively provided with a third control valve and a fourth control valve, and the constant temperature water returns to the constant temperature water tank after being weighed by the weighing unit; the steering valve, Both the third control valve and the fourth control valve are electrically connected to the control unit.

As a further description of the flow control system described in the present invention, preferably, the outlet pipe of the constant temperature water tank is provided with a water volume adjustment control valve and a water delivery electromagnetic flowmeter in sequence, and the water volume adjustment control valve, water delivery electromagnetic flowmeter and control unit electrical connection.

As a further description of the flow control system described in the present invention, preferably, the control unit includes an input panel, a PID regulator, a PLC controller, a control signal output device and a computer; the PLC controller is connected with the input panel, the PID regulator, the The control signal output device is electrically connected with the computer.

As a further description of the flow control system of the present invention, preferably, the computer includes a data storage device, a data display and a remote transmission port.

As a further description of the flow control system described in the present invention, preferably, after the flow signal to be detected is input through the input panel, the input flow signal is transmitted to the PLC controller, and the PLC controller sends the input flow signal to the first variable frequency pump respectively. Compared with the rated flow signal of the second frequency conversion pump, it is judged to start one or two frequency conversion pumps, and the corresponding frequency conversion pump start signal and control valve opening signal are transmitted to the control signal output device, and the control signal output device controls the corresponding control valve and The pump is turned on, and at the same time, the water volume adjustment control valve is controlled to open to the corresponding opening.

As a further description of the flow control system described in the present invention, preferably, after the flow signal of the meter to be detected is input through the input panel, the input flow signal is transmitted to the PLC controller, and the PLC controller compares the input flow signal with the first scale respectively. Compare the maximum weighing weight signal of the weighing device and the second weighing device, judge and select the first weighing device or the second weighing device, and transmit the signal of the selected weighing device to the control signal output device, and the control signal output device controls the steering The valve is adjusted to the corresponding scale line.

As a further description of the flow control system described in the present invention, preferably, the quality verification method or the standard table verification method is selected through the input panel, and the method signal is transmitted to the PLC controller, and the PLC controller receives the input method signal, and the The method signal is converted into a control valve opening and closing signal, and the opening and closing signal is transmitted to a control signal output device, and the control signal output device controls the opening and closing of the third control valve and the fourth control valve.

As a further description of the flow control system described in the present invention, preferably, the first pressure transmitter and the second pressure transmitter transmit the pressure signal to the PID regulator after receiving the pressure signal, and the PID regulator receives the pressure signal and communicates with the set Compare the pressure signal value to find its deviation, and transmit the deviation electrical signal to the PLC controller. The PLC controller receives the deviation electrical signal and processes it to output the frequency signal to the control signal output device. The control signal output device adjusts the first frequency conversion after receiving the frequency signal. The speed of the pump or the second frequency conversion pump, so as to realize constant pressure water supply.

As a further description of the flow control system of the present invention, preferably, the first temperature sensor and the second temperature sensor transmit the temperature signal to the PLC controller after receiving the temperature signal, and the PLC controller receives the temperature signal and transmits it to the computer.

The flow control system for heat meter verification provided by the utility model can not only realize the simultaneous verification of heat meters of different calibers, but also realize the integrated operation and automatic switching of the quality verification method and the standard meter verification method, which improves the verification efficiency. Moreover, the control system can upload real-time operation data and historical data to the server through the Internet or GPRS, so as to realize the remote monitoring unattended function through the PC terminal or the mobile terminal.

Description of drawings

Fig. 1 is the structural representation of the flow control system that the utility model is used for heat meter verification;

Fig. 2 is a control principle diagram of the flow control system used for heat meter verification of the utility model.

The reference signs are explained as follows:

Stable pressure delivery unit 1, constant temperature water tank 11, water volume adjustment control valve 111, water delivery electromagnetic flowmeter 112, first control valve 12, second control valve 13, first frequency conversion pump 14, second frequency conversion pump 15, first stabilizer Pressure tank 16, second pressure regulator tank 17, first pressure transmitter 18, second pressure transmitter 19, multi-section test pipeline 2, flowmeter to be tested 21, standard electromagnetic flowmeter 22, first temperature sensor 23 , the second temperature sensor 24, the weighing unit 3, the first weighing device 31, the second weighing device 32, the steering valve 33, the third control valve 34, the fourth control valve 35, the control unit 4, the input panel 41, PID regulator 42 , PLC controller 43 , control signal outputter 44 , computer 45 , data storage device 451 , data display 452 and remote transmission port 453 .

Detailed ways

In order to further understand the structure, features and other purposes of the present utility model, now in conjunction with the attached preferred embodiments, the attached drawings describe in detail as follows, the illustrated embodiments are only used to illustrate the technical solutions of the present utility model, It does not limit the present utility model.

As shown in Figure 1, Figure 1 is a structural schematic diagram of the flow control system used for heat meter verification in the present invention; Unit 4; wherein, the stabilized pressure conveying unit 1 includes a constant temperature water tank 11 and two parallel stabilized pressure conveying pipelines, and the water outlet pipe of the constant temperature water tank 11 is successively provided with a water volume regulating control valve 111 and a water conveying electromagnetic flowmeter 112, and the water conveying The electromagnetic flowmeter 112 is used to measure the indication value of the instantaneous flow, covering the entire flow range (0.015-12) m ³ /h, and has the function of remote signal output. The water volume adjustment control valve 111 and the water delivery electromagnetic flowmeter 112 are electrically connected to the control unit 4, and the water outlet of the constant temperature water tank 11 is connected with two parallel stabilized pressure delivery pipelines, and the two parallel stabilized pressure delivery pipelines will keep the constant temperature The water is stably transported to the multi-section test pipeline 2; wherein, one stable pressure transmission pipeline is composed of the first control valve 12, the first frequency conversion pump 14, the first pressure stabilizing tank 16 and the first pressure transmitter 18 connected in series , the other stable pressure delivery pipeline is composed of the second control valve 13, the second variable frequency pump 15, the second pressure regulator tank 17 and the second pressure transmitter 19 connected in series; the first control valve 12, the second control valve 13. The first variable frequency pump 14 , the second variable frequency pump 15 , the first pressure transmitter 18 and the second pressure transmitter 19 are electrically connected to the control unit 4 respectively. The rated flows of the first frequency conversion pump 14 and the second frequency conversion pump 15 are the same or one large and one small.

The multi-section test pipeline 2 is composed of multiple single-section test pipelines connected in parallel. The diameters of each section of the test pipeline can be the same or different or partly the same, so as to meet the requirements of simultaneous verification of heat meters of different calibers, and can verify the heat The caliber of the meter is DN15-DN32, and the number of heat meters that can be verified at the same time is 8-16; each section of the test pipeline is provided with a flow meter 21 to be tested and a standard electromagnetic flowmeter 22 in turn, and each section of the test pipeline is also installed at the entrance. There is a test pipeline control valve, the control valve can be a manually adjusted shut-off valve or a solenoid valve connected to the control unit 4, the test pipeline control valve can control the verification of the heat meter to be verified in batches; the inlet of the multi-section test pipeline 2 and the The outlet pipeline is also provided with a first temperature sensor 23 and a second temperature sensor 24, which are respectively used to measure the water temperature at the inlet and outlet of the test pipeline, and the temperature difference measurement range is 2K to 130K; the flow meter to be tested 21, the standard electromagnetic flowmeter 22 . Both the first temperature sensor 23 and the second temperature sensor 24 are electrically connected to the control unit 4 .

The weighing unit 3 comprises a first weighing device 31 and a second weighing device 32 connected in parallel, the maximum weighing capacity of the first weighing device 31 is 1000kg, the maximum weighing capacity of the second weighing device 32 is 3000kg, and the constant temperature water is supplied by The water outlets of the multi-section test pipeline 2 respectively enter the first weighing device 31 and the second weighing device 32 through the steering valve 33, and the water outlets of the first weighing device 31 and the second weighing device 32 are respectively provided with third control valves. The valve 34 and the fourth control valve 35 , the constant temperature water returns to the constant temperature water tank 11 after being weighed by the weighing unit 3 ; the steering valve 33 , the third control valve 34 and the fourth control valve 35 are all electrically connected to the control unit 4 . When the third control valve 34 and the fourth control valve 35 were closed, the constant temperature water entered the first weighing device 31 or the second weighing device 32 for weighing, and the standard meter was calibrated by the mass method; when the third control valve 34 or When the fourth control valve 35 is opened, the constant-temperature water flows through the first weighing device 31 or the second weighing device 32 and returns to the constant-temperature water tank, and the flow rate is verified by a standard meter. This device can meet the verification of grade 2 and grade 3 heat meters.

The heat meter verification device is equipped with an optical reading head, which can automatically read instantaneous flow, cumulative flow, power, cumulative heat, inlet and return water temperature, running time and other data through the optical interface for the measured meter that meets the requirements of the standard protocol.

As shown in Fig. 2, Fig. 2 is the control schematic diagram of the flow control system used for heat meter verification of the present utility model; Control unit 4 comprises input panel 41, PID regulator 42, PLC controller 43, control signal output device 44 and Computer 45; PLC controller 43 are respectively electrically connected with input panel 41, PID regulator 42, control signal output device 44 and computer 45; computer 45 includes data storage device 451, data display 452 and remote transmission port 453.

The verification signal can be input through the input panel 41 or automatically collected by the sensor. After the input verification parameter signal is converted by the A/D converter, the obtained digital signal is transmitted to the PLC controller 43, and the signal is transmitted to the PLC controller 43 after being processed. The control signal output device 44, the control signal output device 44 controls the terminal to execute the control signal, and after being processed by the PLC controller 43, the signal is also transmitted to the computer 45, and the data of the test is displayed through the data display 452, and simultaneously through the data storage device 451 such as a hard disk, etc. For data storage, the data that needs to be collected includes device running time, flow rate, temperature, pressure, etc.; the default data collection and storage interval is 10 seconds to 30 seconds or can be set according to user needs. In order to ensure the reliability of data storage, the system backs up the data that runs every day. The historical data recorded by the system controller has an export function. The historical data can be exported by date, and the format is Excel or SQLite. During the test, the instantaneous flow rate, temperature and pressure of the test pipeline can be collected and displayed by the computer, and can be displayed through the software, the graphics display the pump valve and other components, and the corresponding parameters are displayed at the actual test point, which is clear at a glance. The remote transmission port 453 can upload real-time operation data and historical data to the server through the Internet or GPRS, and realize the remote monitoring unattended function through the PC or mobile phone.

After the flow signal to be detected is input through the input panel 41, the input flow signal is transmitted to the PLC controller 43, and the PLC controller 43 compares the input flow signal with the rated flow signals of the first frequency conversion pump 14 and the second frequency conversion pump 15 respectively, and judges Start one or two frequency conversion pumps, and transmit the corresponding frequency conversion pump start signal and control valve opening signal to the control signal output device 44, the control signal output device 44 controls the corresponding control valve and pump to open, and controls the water volume adjustment control valve 111 at the same time Open to the corresponding opening. Automatic water supply in different flow ranges can be realized through the selection of the number of start-up pumps by the controller, which increases the flow verification range of the heat meter, and also avoids damage to the pump caused by too small water flow delivered by the large-flow pump, or frequent adjustment of the delivery pump. The instability of the water supply system caused by the amount of water.

After the flow signal of the meter to be detected is input through the input panel 41, the input flow signal is transmitted to the PLC controller 43, and the PLC controller 43 compares the input flow signal with the maximum weighing capacity of the first weighing device 31 and the second weighing device 32 respectively. Weight signal comparison, judge to select the first weighing device 31 or the second weighing device 32, and transmit the signal of the selected weighing device to the control signal output device 44, and the control signal output device 44 controls the steering valve 33 to adjust to the corresponding weighing device pipeline. The calibration of heat meters with different flow rates can be realized through the selection of weighing devices with different weighing capacities by the controller and the selection of delivery pumps with different flow rates. The control system adopts fast closed commutator, which has fast action speed, low noise and good sealing performance.

Select the quality verification method or the standard meter verification method through the input panel 41, and transmit the method signal to the PLC controller 43, and the PLC controller 43 receives the input method signal, converts the method signal into a control valve opening and closing signal, and transmits the method signal The opening and closing signal is transmitted to the control signal outputter 44, and the control signal outputter 44 controls the opening and closing of the third control valve 34 and the fourth control valve 35. Through the control of the third control valve 34 and the fourth control valve 35, the automatic conversion between the quality method and the standard table method is realized, and the integrated verification of the two methods is realized.

The first pressure transmitter 18 and the second pressure transmitter 19 transmit the pressure signal to the PID regulator 42 after receiving the pressure signal. Transmission to the PLC controller 43, the PLC controller 43 receives the deviation electrical signal and outputs the frequency signal to the control signal output device 44 after processing, and the control signal output device 44 adjusts the first frequency conversion pump 14 or the second frequency conversion pump 14 through the frequency converter after receiving the frequency signal The rotating speed of the pump 15 can realize constant pressure water supply. The device adopts a unique controller to control the double closed-loop control mode of the frequency converter to ensure the stability of the flow rate in the working state. It adopts the constant pressure frequency conversion control technology to make the water supply pressure more stable and ensure that the loop water flow of the pipeline water supply is stable. In the range.

The system adopts the advanced imported flow control valve and the flow control algorithm designed with high precision to realize the automatic control of the instantaneous flow rate. During the verification process, it is only necessary to set the current flow point and start the system verification. The flow control is automatically completed to ensure the test efficiency and the stability of the working state.

The first temperature sensor 23 and the second temperature sensor 24 transmit to the PLC controller 43 after receiving the temperature signal, and the PLC controller 43 receives the temperature signal and transmits to the computer 45, and the computer displays the temperature measurement value through the display; Signals received by the system are also displayed on the display.

The control system also has safety protection functions: when the system fails, it has the function of automatic storage of state records and alarm function. When an accident or emergency occurs, the system can automatically perform hardware safety self-locking and protection; the system power control cabinet can Complete the manual control operation to control the start and stop of all power equipment, provide power distribution for the entire device, and have overload, overcurrent, overvoltage and leakage protection measures.

The fully automatic detection and control system provided by the utility model can pre-set the detection points and detection states according to the requirements of the verification regulations or inspection rules, and realize flow detection, temperature detection, flow control, valve selection, and electronic scale (or standard meter) reading. The acquisition and reading of the inspected meter are all controlled by computer, which realizes the automation of the verification process, reduces the verification time, improves the verification efficiency, and is suitable for large-scale production and verification.

It should be declared that the content of the above utility model and specific implementation methods are intended to prove the practical application of the technical solutions provided by the utility model, and should not be interpreted as limiting the scope of protection of the utility model. Those skilled in the art may make various modifications, equivalent replacements or improvements within the spirit and principle of the present utility model. The scope of protection of the utility model shall be determined by the appended claims.

Claims (9)

1. A flow control system for calorimeter verification, characterized in that, the flow control system comprises: a pressure-stabilizing delivery unit (1), a multi-section test pipeline (2), a weighing unit (3) and a control unit (4); where, The stabilized pressure delivery unit (1) comprises a constant temperature water tank (11) and two parallel stabilized pressure conveying pipelines, the water outlet of the constant temperature water tank (11) communicates with the two parallel stabilized pressure conveying pipelines, and the two parallel connected The constant-temperature water is stably delivered to the multi-section test pipeline (2) by the pressure-stabilized delivery pipeline; Among them, one line of stable pressure delivery pipeline is composed of the first control valve (12), the first frequency conversion pump (14), the first pressure stabilizing tank (16) and the first pressure transmitter (18) connected in series, and the other line The pressure-stabilizing delivery pipeline is composed of the second control valve (13), the second frequency conversion pump (15), the second pressure-stabilizing tank (17) and the second pressure transmitter (19) connected in series; the first control valve ( 12), the second control valve (13), the first frequency conversion pump (14), the second frequency conversion pump (15), the first pressure transmitter (18) and the second pressure transmitter (19) are respectively connected with the control unit (4) electrical connection; The multi-section test pipeline (2) is composed of multiple single-section test pipelines connected in parallel, and each section of the test pipeline is provided with a flowmeter (21) to be tested and a standard electromagnetic flowmeter (22) in turn; the inlet of the multi-section test pipeline (2) Also be provided with the first temperature sensor (23) and the second temperature sensor (24) on the and outlet pipeline respectively, be respectively used for measuring the water temperature of test pipeline inlet and outlet; 22), the first temperature sensor (23) and the second temperature sensor (24) are all electrically connected to the control unit (4); The weighing unit (3) includes a first weighing device (31) and a second weighing device (32) connected in parallel, and constant temperature water enters the first weighing device (32) through the diverting valve (33) through the water outlet of the multi-section test pipeline (2). Weighing device (31) and the second weighing device (32), the water outlet of the first weighing device (31) and the second weighing device (32) are provided with the 3rd control valve (34) and the 4th control valve respectively. valve (35), the constant temperature water returns to the constant temperature water tank (11) after being weighed by the weighing unit (3); the steering valve (33), the third control valve (34) and the fourth control valve (35) are all connected with the control unit (4) Electrical connection. 2. The flow control system according to claim 1, characterized in that, the outlet pipe of the constant temperature water tank (11) is provided with a water volume adjustment control valve (111) and a water delivery electromagnetic flowmeter (112) in sequence, and the water volume adjustment control valve (111) and the water delivery electromagnetic flowmeter (112) are electrically connected with the control unit (4). 3. flow control system as claimed in claim 2 is characterized in that, control unit (4) comprises input panel (41), PID regulator (42), PLC controller (43), control signal exporter (44) and computer (45); PLC controller (43) is electrically connected with input panel (41), PID regulator (42), control signal output device (44) and computer (45) respectively. 4. The flow control system of claim 3, wherein the computer (45) includes a data storage device (451), a data display (452) and a remote transmission port (453). 5. The flow control system according to claim 3, characterized in that, after the flow signal to be detected is input through the input panel (41), the input flow signal is transmitted to the PLC controller (43), and the PLC controller (43) will The input flow signal is compared with the rated flow signals of the first variable frequency pump (14) and the second variable frequency pump (15) to determine whether to start a single or two variable frequency pumps, and transmit the corresponding variable frequency pump start signal and control valve opening signal To the control signal output device (44), the control signal output device (44) controls the corresponding control valve and the pump to open, and simultaneously controls the water volume adjustment control valve (111) to open to the corresponding opening. 6. The flow control system as claimed in claim 5, characterized in that, after the flow signal of the meter to be detected is input through the input panel (41), the input flow signal is transmitted to the PLC controller (43), and the PLC controller (43) Compare the input flow signal with the maximum weighing signal of the first weighing device (31) and the second weighing device (32), and judge whether to select the first weighing device (31) or the second weighing device (32) , and transmit the signal of the selected weighing device to the control signal output device (44), and the control signal output device (44) controls the steering valve (33) to adjust to the corresponding weighing device pipeline. 7. flow control system as claimed in claim 3 is characterized in that, selects quality verification method or standard table verification method by input panel (41), and method signal is transmitted to PLC controller (43), PLC controller ( 43) Receive the input method signal, convert the method signal into a control valve opening and closing signal, and transmit the opening and closing signal to the control signal output device (44), and the control signal output device (44) controls the third control valve (34 ) and the fourth control valve (35) open and close. 8. The flow control system according to claim 3, characterized in that, the first pressure transmitter (18) and the second pressure transmitter (19) transmit the pressure signal to the PID regulator (42) after receiving the pressure signal, and the PID The regulator (42) receives the pressure signal and compares it with the set pressure signal value to find its deviation, and transmits the deviation electrical signal to the PLC controller (43), and the PLC controller (43) receives the deviation electrical signal and outputs a frequency signal after processing To the control signal output device (44), the control signal output device (44) adjusts the speed of the first frequency conversion pump (14) or the second frequency conversion pump (15) after receiving the frequency signal, thereby realizing constant pressure water supply. 9. flow control system as claimed in claim 3 is characterized in that, the first temperature sensor (23) and the second temperature sensor (24) transmit to PLC controller (43) after receiving temperature signal, PLC controller (43 ) receives the temperature signal and transmits it to the computer (45).