Testing device of flow totalizer

Abstract

The utility model discloses a testing device for a flow totalizer, which comprises an alternating current power supply port L, an alternating current power supply port N, an alternating current power supply port PE, a circuit breaker QF, a standard voltage source U, a touch screen HMI, a transistor output type PLC, a standard current source I, a standard resistance box R, a galvanometer A, an indicating lamp HL1, an indicating lamp HL2, a selective switch SA1, a selective switch SA2 and a terminal strip XT. According to the utility model, aiming at the difficulties of verification regulations and maintenance tests of the flow totalizer, the testing device is relatively high in integration level, is provided with a multifunctional standard signal generator and a built-in flow algorithm, can replace the traditional mode of combined work of multiple signal generators and instruments, can be operated through a touch screen, is relatively simple, convenient and flexible, and is relatively high in applicability; the accuracy is higher, and the stability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment testing, in particular to a testing device for a flow totalizer. Background Art

[0002] The flow totalizer can collect, display, control, remotely transmit, communicate, print and process various signals such as temperature, pressure, flow rate, etc., forming a digital collection system and control system. The flow totalizer is used in conjunction with various flow sensors or transmitters, temperature sensors or transmitters, and pressure transmitters to measure, display, accumulate, alarm, control, transmit, output, collect data and communicate flow parameters such as steam, natural gas, and general gas.

[0003] In the prior art, flow totalizers generally have the following problems: due to the large number of models and specifications and the complicated parameter settings, the test process and indication correction are relatively complicated during maintenance work or regular calibration, and multiple signal generators and instruments are required to work together, which results in a large workload and complicated operations. Utility Model Content

[0004] The utility model provides a flow totalizer test device which is simple and flexible to operate and has stronger applicability, and can solve at least one of the above technical problems.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A flow totalizer test device includes an AC power port L, an AC power port N and an AC power port PE, and also includes a circuit breaker QF, a standard voltage source U, a touch screen HMI, a transistor output type PLC, a standard current source I, a standard resistance box R, a galvanometer A, an indicator light HL1, an indicator light HL2, a selection switch SA1, a selection switch SA2 and a terminal block XT;

[0007] The AC power source passes through the circuit breaker QF from the AC power port L and the AC power port N to the AC side of the standard voltage source U and the No. 19 terminal 220V-L and No. 20 terminal 220V-N of the terminal block XT respectively;

[0008] The AC power port PE is connected to terminal PE No. 21 of the terminal block XT.

[0009] Furthermore, the standard voltage source U is respectively connected to the touch screen HMI, the transistor output type PLC and the standard current source I for providing a DC power supply.

[0010] Furthermore, terminal No. 1 and terminal No. 2 of the terminal block XT are respectively connected to the communication A signal and the communication B signal of the flow totalizer, and are both connected to the communication port of the touch screen HMI.

[0011] Furthermore, the pulse output terminal of the transistor output type PLC is connected to the frequency (+) and frequency (-) of the flow totalizer via the terminal 3 and the terminal 4 of the terminal block XT respectively.

[0012] Further, the (+) output terminal of the standard current source I is connected to the differential pressure (+) of terminal 5, the pressure (+) of terminal 7, and the temperature (+) of terminal 9 of the terminal block XT in sequence via the selection switch SA1;

[0013] The (-) output end of the standard current source I is connected in sequence to the temperature (-) of terminal No. 10, the pressure (-) of terminal No. 8, and the differential pressure (-) of terminal No. 6 of the terminal row XT.

[0014] Furthermore, the interior of the standard resistor box R is connected with 0.02-level standard resistors of different resistance values, which are respectively connected to the No. 11 terminal PT100-1 and the No. 12 terminal PT100-2 of the terminal row XT via the selection switch SA2.

[0015] Furthermore, the galvanometer A is connected to the 13th terminal OUT(+) and the 14th terminal OUT(-) of the terminal block XT respectively.

[0016] Furthermore, the indicator light HL1 is connected to terminal No. 15 12V (+) and terminal No. 16 12V (-) of the terminal block XT respectively.

[0017] Furthermore, the indicator light HL2 is connected to terminal No. 17 24V (+) and terminal No. 18 24V (-) of the terminal block XT respectively.

[0018] The beneficial effects of the utility model are embodied in:

[0019] This test device aims at the difficulties of flow totalizer calibration procedures and maintenance tests. It has a high degree of integration, a multifunctional standard signal generator, and a built-in flow algorithm. It can replace the traditional mode of multiple signal generators and instruments working together. It can be operated through the touch screen, which is simpler and more flexible, more applicable, more accurate, and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0021] Figure 1 It is an overall structural principle diagram of an embodiment of the utility model.

[0022] Figure 2 It is a panel schematic diagram of a touch screen according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] It should be noted that a person of ordinary skill in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. In addition, the "flow totalizer" in this application is aimed at the flow totalizer with a higher degree of universality in the current market.

[0025] See also Figure 1 , the embodiment of the utility model provides a test device for a flow totalizer, an AC power port L, an AC power port N and an AC power port PE, and also includes a circuit breaker QF, a standard voltage source U, a touch screen HMI, a transistor output type PLC, a standard current source I, a standard resistance box R, a galvanometer A, an indicator light HL1, an indicator light HL2, a selection switch SA1, a selection switch SA2 and a terminal block XT;

[0026] The AC power source passes through the circuit breaker QF from the AC power port L and the AC power port N to the AC side of the standard voltage source U and the No. 19 terminal 220V-L and No. 20 terminal 220V-N of the terminal block XT respectively;

[0027] The AC power port PE is connected to terminal PE No. 21 of the terminal block XT.

[0028] In the utility model, the test device aims at the difficulties of the flow totalizer calibration procedures and maintenance tests, has a high degree of integration, is equipped with a multifunctional standard signal generator, and has a built-in flow algorithm. It can replace the traditional mode of multiple signal generators and instruments working together, and can be operated through a touch screen. It is simpler and more flexible, has stronger applicability, higher accuracy, and better stability.

[0029] See also Figure 1 In this embodiment, the standard voltage source U is respectively connected to the touch screen HMI, the transistor output type PLC and the standard current source I for providing a DC power supply.

[0030] See also Figure 1 In this embodiment, terminal 1 and terminal 2 of the terminal block XT are respectively connected to the communication A signal and the communication B signal of the flow totalizer, and are both connected to the communication port of the touch screen HMI.

[0031] See also Figure 1 In this embodiment, the pulse output terminal of the transistor output type PLC is connected to the frequency (+) and frequency (-) of the flow totalizer via the terminal 3 and the terminal 4 of the terminal block XT respectively.

[0032] See also Figure 1 In this embodiment, the (+) output terminal of the standard current source I is connected to the differential pressure (+) of terminal 5, the pressure (+) of terminal 7, and the temperature (+) of terminal 9 of the terminal block XT in sequence via the selection switch SA1;

[0033] The (-) output end of the standard current source I is connected in sequence to the temperature (-) of terminal No. 10, the pressure (-) of terminal No. 8, and the differential pressure (-) of terminal No. 6 of the terminal row XT.

[0034] See also Figure 1 In this embodiment, the standard resistor box R is internally connected with 0.02-level standard resistors of different resistance values, which are respectively connected to the No. 11 terminal PT100-1 and the No. 12 terminal PT100-2 of the terminal row XT via the selection switch SA2.

[0035] See also Figure 1 In this embodiment, the galvanometer A is connected to the 13th terminal OUT (+) and the 14th terminal OUT (-) of the terminal block XT respectively.

[0036] See also Figure 1 In this embodiment, the indicator light HL1 is respectively connected to the terminal 15 12V (+) and the terminal 16 12V (-) of the terminal block XT.

[0037] See also Figure 1In this embodiment, the indicator light HL2 is respectively connected to terminal No. 17 24V (+) and terminal No. 18 24V (-) of the terminal block XT.

[0038] This test device can replace the following equipment involved in the verification procedures: standard digital signal generator, standard ammeter, standard voltmeter, standard resistance box, timer, counter, frequency signal generator, standard current source, standard voltage source, etc.

[0039] The test device measures signals including current, voltage, resistance, frequency, pulse, thermocouple temperature, thermal resistor temperature, pressure, etc. The device has the function of triggering multiple signals simultaneously. After setting three channel signals, the output can be triggered simultaneously.

[0040] In normal use, this test device is Figure 1 According to the wiring requirements of the terminal block XT, the test device is connected to the flow totalizer to be tested, and the conversion switch SA1 and the conversion switch SA2 are placed in the neutral position, the circuit breaker QF is closed, and the 220V AC power supply is connected. The test device and the components of the flow totalizer to be tested are powered on, and the corresponding indicator lights are lit. The galvanometer A and the communication indication are correct, indicating that the flow totalizer to be tested is basically working normally. Otherwise, the fault can be found according to the problems of the indicator lights HL1, HL2 and the galvanometer A.

[0041] After 20 minutes of preheating, first set the flow totalizer to normal mode, and then select the test object from the touch screen HMI, such as gas, saturated steam, superheated steam, etc. Figure 2 As shown, after determining the test object, input the set values ​​of pressure, temperature, flow coefficient and frequency. Since the flow algorithm of the relevant object has been built into the program of the touch screen HMI and transistor output type PLC in advance, it is possible to determine whether the current flow totalizer is normal by observing whether the instantaneous flow and accumulated flow output by the touch screen HMI are consistent with the values ​​of the flow totalizer being tested;

[0042] Increase the input signal from the lower limit, input the nominal electric quantity value corresponding to each inspected point to the flow totalizer, and read the corresponding indication value of the flow totalizer until the upper limit is reached; then reduce the input signal, input the nominal current value corresponding to each inspected point to the flow totalizer, and read the corresponding indication value of the display unit until the lower limit is reached;

[0043] When the displayed value has a large error with the actual value of the measured flow totalizer, the flow totalizer can be set to the calibration mode, and then the current source signal is connected to the terminals 5-10 of the terminal block XT through the selection switch SA1, and the differential pressure, pressure and temperature display values ​​are observed respectively through the input signals: when the input signal is 4mA, press the accumulation key of the flow totalizer, and the flow totalizer will automatically calibrate the zero point; when the input signal is 20mA, press the instantaneous key of the flow totalizer, and the flow totalizer will automatically calibrate the full scale; then input 4mA, 12mA and 20mA respectively, and the corresponding display should be 0, 0.5 and 1.0, and the error should be within the allowable range, otherwise readjust;

[0044] For a platinum resistor (Pt100), input resistance values ​​of 100Ω and 250Ω respectively through the selection switch SA2, press the accumulation key (zero adjustment) or momentary key (full adjustment) of the flow totalizer, and the flow totalizer will automatically complete the full scale and zero point calibration.

[0045] In summary, this test device aims at the difficulties of flow totalizer calibration procedures and maintenance tests. It has a high degree of integration, a multifunctional standard signal generator, and a built-in flow algorithm. It can replace the traditional mode of multiple signal generators and instruments working together. It can be operated through the touch screen, which is simpler and more flexible, more applicable, more accurate, and more stable.

[0046] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow totalizer test device, comprising an AC power port L, an AC power port N and an AC power port PE, characterized in that: It also includes a circuit breaker QF, a standard voltage source U, a touch screen HMI, a transistor output type PLC, a standard current source I, a standard resistance box R, an ammeter A, an indicator light HL1, an indicator light HL2, a selection switch SA1, a selection switch SA2 and a terminal block XT; The AC power source passes through the circuit breaker QF from the AC power port L and the AC power port N to the AC side of the standard voltage source U and the No. 19 terminal 220V-L and No. 20 terminal 220V-N of the terminal block XT respectively; The AC power port PE is connected to terminal PE No. 21 of the terminal block XT; Terminal 1 and terminal 2 of the terminal block XT are respectively connected to the communication A signal and the communication B signal of the flow totalizer, and are both connected to the communication port of the touch screen HMI; The pulse output terminal of the transistor output type PLC is connected to the frequency + and frequency - of the flow totalizer via the No. 3 terminal and the No. 4 terminal of the terminal block XT respectively.

2. The flow totalizer test device according to claim 1, characterized in that: The standard voltage source U is respectively connected to the touch screen HMI, the transistor output type PLC and the standard current source I for providing a DC power supply.

3. The flow totalizer test device according to claim 1, characterized in that: The + output end of the standard current source I is connected to the differential pressure + of terminal 5, the pressure + of terminal 7 and the temperature + of terminal 9 of the terminal block XT in sequence via the selection switch SA1; The - output end of the standard current source I is connected in sequence to terminal No. 10 temperature-, terminal No. 8 pressure- and terminal No. 6 differential pressure- of the terminal row XT.

4. The flow totalizer test device according to claim 1, characterized in that: The standard resistor box R is internally connected with 0.02-level standard resistors of different resistance values, which are respectively connected to the No. 11 terminal PT100-1 and the No. 12 terminal PT100-2 of the terminal row XT via the selection switch SA2.

5. The flow totalizer test device according to claim 1, characterized in that: The galvanometer A is connected to the 13th terminal OUT+ and the 14th terminal OUT- of the terminal block XT, respectively.

6. The flow totalizer test device according to claim 1, characterized in that: The indicator light HL1 is connected to terminal No. 15 12V+ and terminal No. 16 12V- of the terminal block XT respectively.

7. The flow totalizer test device according to claim 1, characterized in that: The indicator light HL2 is connected to terminal No. 17 24V+ and terminal No. 18 24V- of the terminal block XT respectively.

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