CN216361634U - Gas flow standard part calibrating device - Google Patents

Abstract

A gas flow standard part calibration device comprises a reference flowmeter body, a stabilized voltage power supply and a shell; also has a comparison circuit and a judgment circuit; the air inlet end and the air outlet end of the reference flowmeter body are positioned outside the two ends of the shell, the air inlet end of the reference flowmeter body is provided with a valve, and the upper end of the valve is connected with an air outlet pipe of an air compressor through a pipeline; the stabilized voltage supply, the comparison circuit and the judgment circuit are arranged in the element box and are electrically connected with the reference flowmeter body and the detected flowmeter. The utility model has compact structure and convenient use, and can prompt the tester that the tested flowmeter has the metering problem when the tested flowmeter has abnormal output voltage signal which is too high or too low. This is novel has prevented that the people from reading the error and leading to the judged result mistake, has brought the facility for the measurement personnel from this, has improved detection work efficiency, and has guaranteed that the testing result is true effective. Based on the above, so this novel application prospect that has.

Description

Gas flow standard part calibrating device

Technical Field

The utility model relates to the technical field of detection equipment, in particular to a gas flow standard part calibration device.

Background

A flowmeter (i.e., a gas flow standard) is a device for measuring the flow of liquid and gas in a pipeline. When the flowmeter works, liquid or gas flows in from one end of the flowmeter and flows out from the other end of the flowmeter, and then a display interface (mainly a liquid crystal screen or a nixie tube) of the flowmeter displays specific flow data under the action of relevant parts of the flowmeter.

In practical situations, the problem of inaccurate measurement can occur after the flowmeter is used for a period of time due to aging, production quality and the like. In order to prevent the influence of a flowmeter and metering inaccuracy on production in the prior art, the flowmeter is generally disassembled after a period of time, the air inlet end of the flowmeter is connected into the exhaust end of a standard flowmeter detection device for verification (the air inlet end of a benchmark flowmeter of the standard flowmeter detection device is connected in parallel), then the reading between the detected flowmeter and the standard flowmeter is artificially judged, when the readings of the two are close, the verified flowmeter is judged to be correct in reading and normal in work, otherwise, the verified flowmeter is judged to be abnormal in work (in order to realize the verification accuracy, the benchmark flowmeter also needs to be verified at certain time intervals). Because the reading of the detected flowmeter and the reading of the reference flowmeter need to be artificially judged, certain inconvenience can be brought to workers, and the improvement of the detection working efficiency is not facilitated. Moreover, if the human detection is careless or not very responsible, the detection personnel do not carefully observe and compare the measurement readings of the reference flowmeter and the detected flowmeter, which can bring adverse effects to the verification result. Based on the above, the calibration device which does not need manual reading, can automatically judge whether the detected flowmeter and the metering are accurate and can visually prompt the result of the detection personnel is particularly necessary.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects that in the prior art, no applicable equipment is provided, whether the measurement reading of the flow meter is accurate or not depends on manual operation completely, which brings inconvenience to detection personnel and is not beneficial to improving the working efficiency, the utility model has the advantages of compact structure, convenient use, no need of manual reading judgment under the combined action of related mechanisms and circuits during detection, automatic comparison of data results detected by the reference flowmeter and the detected flowmeter, when the measured flowmeter is not accurately measured or the measurement is accurate, the method can give visual prompt to the measuring personnel, prevent the judgment result from being wrong due to the artificial reading error, therefore, convenience is brought to detection personnel, the detection working efficiency is improved, and the gas flow standard part calibration device is ensured to be real and effective in detection result.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a gas flow standard part calibration device comprises a reference flowmeter body, a stabilized voltage power supply and a shell; it is characterized in that the device also comprises a comparison circuit and a judgment circuit; the air inlet end and the air outlet end of the reference flowmeter body are positioned outside the two ends of the shell, the air inlet end of the reference flowmeter body is provided with a valve, and the upper end of the valve is connected with an air outlet pipe of an air compressor through a pipeline; the voltage-stabilized power supply, the comparison circuit and the judgment circuit are arranged in the element box; the signal output end of the reference flowmeter body is electrically connected with the first path of signal input end of the comparison circuit, and the signal output end of the detected flowmeter is electrically connected with the second path of signal input end of the comparison circuit.

Further, the front upper end of the housing has a viewing port.

Further, the stabilized voltage supply is an alternating current to direct current switching power supply module.

Furthermore, the comparison circuit comprises a resistor, an operational amplifier integrated circuit, a diode, a PNP triode, a buzzer and a resistor, the operational amplifier integrated circuit comprises an operational amplifier integrated circuit, a diode, an PNP triode and a buzzer, wherein the positive power input end of the operational amplifier integrated circuit is connected with an emitting electrode of the PNP triode, the negative power input end of the operational amplifier integrated circuit is connected with the negative power input end of the buzzer, the output end of the operational amplifier integrated circuit is connected with the negative electrode of the diode, the positive electrode of the diode is connected with one end of a first resistor, the other end of the first resistor is connected with the base electrode of the PNP triode, the collecting electrode of the PNP triode is connected with the positive power input end of the buzzer, one end of a second resistor is connected with a first reverse input end of the operational amplifier integrated circuit, the same-phase input end of the second resistor is connected, the same-phase input end of the operational amplifier integrated circuit is connected with one end of a third resistor, and the other end of the third resistor is connected with a second reverse input end of the operational amplifier integrated circuit.

Further, the judging circuit comprises a time control switch and a buzzer, the time control switch is electrically connected with the buzzer, and the power output end of the time control switch is connected with the power input two ends of the buzzer.

The utility model has the beneficial effects that: the utility model has compact structure and convenient use, the flange plate at the air inlet end of the flowmeter to be detected is connected with the flange plate at the air inlet end of the reference flowmeter before detection, then the air valve of the air compressor is opened, compressed air synchronously enters the air inlet ends of the reference flowmeter and the flowmeter to be detected, and then the signal output ends of the reference flowmeter and the flowmeter to be detected synchronously output voltage signals and enter the signal input end of the detection circuit, and the detection circuit can sound through the buzzer to prompt a detector that the flowmeter to be detected has a metering problem when the abnormal output voltage signals of the flowmeter to be detected are too high or too low; when the detected flowmeter has no metering problem in the detection and verification, the buzzer of the judgment circuit can be electrified to make a loud prompt sound after a period of time, so that the detected flowmeter is prompted to work normally by a tester. This is novel has prevented that the people from reading the error and leading to the judged result mistake, has brought the facility for the measurement personnel from this, has improved detection work efficiency, and has guaranteed that the testing result is true effective. Based on the above, so this novel application prospect that has.

Drawings

The utility model is further illustrated below with reference to the figures and examples.

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1 and 2, a gas flow standard calibration device comprises a reference flowmeter body A3 (vortex shedding flowmeter), a regulated power supply a1, a housing 2; also has a comparison circuit 3 and a judgment circuit 4; the standard flowmeter body A3 is installed at the inner lower part of the shell 2, a flange is welded at the air inlet end and the air outlet end of the standard flowmeter body A3 respectively, the two flanges are located outside the lower ends of the left part and the right part of the shell 2 respectively, a manual valve 5 is installed at the upper end of the left outer end of the shell at the air inlet end of the standard flowmeter body A3, an air inlet pipe 6 is installed at the upper end of the manual valve 5, and the air inlet pipe 6 is connected with an air outlet pipe of an air compressor (not shown in the figure) through a hose; the stabilized voltage supply A1, the comparison circuit 3 and the judgment circuit 4 are arranged on a circuit board in the element box 7, and the element box 7 is arranged at the inner upper end of the shell 2. The front upper end of the case 2 has a transparent observation plate through which a tester can observe the flow rate count of the test fluid of the reference flowmeter body 1.

As shown in fig. 1 and 2, the regulated power supply a1 is a finished product of a 220V/12V ac-to-220V dc-to-12V switching power supply module. The reference flowmeter body A3 has two power input ends 1 and 2 pins, and a signal output end 3 pin, and when the flowmeter works, the signal output end can output voltage signals varying between 0-5V along with different flow rates of fluid entering through the air inlet end and fluid discharged through the air outlet end. The comparison circuit comprises resistors R1, R2, R3, an operational amplifier integrated circuit A4 with the model NE5532N, a diode VD, a PNP triode Q1 and a buzzer B, the resistors, the operational amplifier integrated circuit, the diode, the PNP triode and the buzzer are electrically connected, an 8 pin of a positive power supply input end of the operational amplifier integrated circuit A4 is connected with an emitter of the PNP triode Q1, a4 pin of a negative power supply input end of the operational amplifier integrated circuit A4 is connected with a negative power supply input end of the buzzer B, a1 pin and a 7 pin of an output end of the operational amplifier integrated circuit A4 are connected with a negative electrode of the diode VD, an anode of the diode VD is connected with one end of a first resistor R2, the other end of the first resistor R2 is connected with a base of the PNP triode Q1, a collector of the PNP triode Q1 is connected with a positive power supply input end of the buzzer B, one end of a second resistor R1 is connected with a2 pin of a first reverse input end of the operational amplifier integrated circuit A4 and a5 pin of a second non-phase input end, the pin 3 of the first non-inverting input end of the operational amplifier integrated circuit A4 is connected with one end of a third resistor R3, and the other end of the third resistor R3 is connected with the pin 6 of the second inverting input end of the operational amplifier integrated circuit A4. The judging circuit comprises a time control switch A5 and a buzzer B1, the time control switch is connected with the buzzer through circuit board wiring, and the power output end 3 and the pin 4 of the time control switch A5 are respectively connected with the two ends of the power input end of the buzzer B1; the time control switch A5 is a full-automatic microcomputer time control switch product with model KG316T, the microcomputer time control switch has a liquid crystal display, seven keys of cancel/restore, time correction, week correction, automatic/manual, timing and clock, two power input ends 1, 2 feet, two power output ends 3, 4 feet, before application, a user respectively presses and operates seven keys, the interval time of the two power output ends for outputting power and the time for outputting power can be set, after one time of setting, the power failure can not cause the change of the set power output time as long as the next key setting is not performed.

As shown in fig. 1 and 2, pins 1 and 2 of a power input end of a regulated power supply a1 and two poles of an alternating current 220V power supply are respectively connected through leads. Pins 3 and 4 of a power output end of the voltage-stabilized power supply A1, pins 8 and 4 (other pins are suspended) of the operational amplifier integrated circuit A4 at two ends of the power input end of the comparison circuit, pins 1 and 2 of the time control switch A5 at the power input end of the judgment circuit and pins 1 and 2 of the power input end of the reference flowmeter body A3 are respectively connected through leads. The 3 pins of the signal output end of the reference flowmeter body A3, the 3 pins of the first path signal input end operational amplifier integrated circuit A4 of the comparison circuit and the other end of the resistor R3 are connected through leads. And a lead connected with the other end of the second signal input end resistor R1 of the comparison circuit and the pin 5 of the operational amplifier integrated circuit A4 and two leads connected with the output ends 3 and 4 of the positive and negative pole power supplies of the stabilized voltage supply A1 are led out from the left upper end of the shell 2 and are positioned outside the left upper end of the shell 2. The signal output end 3 pin of a detected flowmeter A2 (which is provided with two power supply input ends 1 and 2 pins and a signal output end 3 pin, when the flowmeter works, the signal output end can output a voltage signal which is changed between 0 and 5V along with the different flow rates of fluid entering through an air inlet end and being discharged through an air outlet end) is connected with the other end of a second signal input end resistor R1 of a comparison circuit and a second in-phase input end 5 pin of an operational amplifier integrated circuit through a lead.

As shown in figures 1 and 2, the utility model has compact structure and convenient use, before detection, a flange plate at the air inlet end of a flowmeter A2 (vortex shedding flowmeter) to be detected is connected with a flange plate at the air inlet end of a reference flowmeter A3, then leads connected with pins 3 and 4 of a voltage stabilizing power supply A1, leads connected with the other end of a resistor R1 of an operational amplifier integrated circuit A4 and pins 5 are respectively connected with the power input ends and the signal output ends of the positive and negative poles of a detected flowmeter A2, and then a detection and verification procedure can be entered. After the 220V alternating current power supply enters pins 1 and 2 of the stabilized voltage supply A1, the stabilized voltage supply A1 outputs stable direct current 12V power supply under the action of an internal circuit of the stabilized voltage supply A1, the stable direct current power supply enters the comparison circuit, the judgment circuit, the reference flowmeter A3 and the power supply input end of the flowmeter A2 to be detected, and then the circuits and the flowmeter are in an electrified working state. After an air valve and a manual valve 5 of the air compressor are opened, compressed air synchronously enters the air inlet ends of a reference flowmeter A3 and a detected flowmeter A2 through the manual valve 5, and then voltage signals are synchronously output by pins 3 of signal output ends of the reference flowmeter A3 and the detected flowmeter A2 and enter a signal input end of a detection circuit; the signal voltage output by the pin 3 of the reference flowmeter A3 enters the pin 3 of the first non-inverting input end of the operational amplifier integrated circuit A4, then enters the pin 6 of the second inverting input end of the operational amplifier integrated circuit A4 through the resistor R3 in a voltage reduction and current limiting manner, the voltage signal output by the pin 3 of the signal output end of the detected flowmeter A2 enters the pin 5 of the second non-inverting input end of the operational amplifier integrated circuit A4, and enters the pin 2 of the first inverting input end of the operational amplifier integrated circuit A4 in a voltage reduction and current limiting manner through the resistor R1.

As shown in fig. 1 and 2, after the determining circuit is powered, the voltage of the pin 3 at the first non-inverting input terminal of the operational amplifier integrated circuit a4 is provided by a high-level voltage signal output by the pin 3 of the reference flow meter A3 (model number DN10), and the voltage of the pin 6 at the second inverting input terminal is provided by a resistor R3 for reducing voltage and limiting current via a voltage signal output by the pin 3 of the reference flow meter A3; the pin 2 voltage of the first inverting input terminal of the operational amplifier integrated circuit A4 is provided by a high-level voltage signal output by a pin 3 of the detected flowmeter A2 through a resistor R1 in a voltage dropping and current limiting mode, and the pin 5 voltage of the second non-inverting input terminal is provided by a voltage signal output by a pin 3 of the detected flowmeter A2. In practical situations, the amounts of compressed air entering the reference flowmeter A3 and the detected flowmeter a2 are the same, so that the signal voltages (for example, 4.5V) output by the 3 pins of the two are close to the same, the voltage signal of the 3 pin of the first non-inverting input terminal of the operational amplifier integrated circuit a4 is higher than the voltage (for example, higher than 0.2V) of the 2 pin of the first inverting input terminal, then the 1 pin of the operational amplifier integrated circuit a4 keeps outputting a high-level signal, the PNP triode Q1 is turned off, and the buzzer B cannot be sounded by electricity. Meanwhile, the voltage signal of the pin 6 of the second inverting input terminal of the operational amplifier integrated circuit a4 is lower than the voltage of the pin 5 of the second non-inverting input terminal (for example, lower than 0.2V), so that the pin 7 of the operational amplifier integrated circuit a4 keeps outputting a high-level signal, the PNP triode Q1 is cut off, and the buzzer B cannot be powered to sound. When the detected flowmeter a2 has an ultrahigh counting fault, that is, the output voltage signal is too high, at this moment, the signal voltage output by the pin 3 of the detected flowmeter a2 is reduced in voltage and limited by the resistor R1, enters the pin 2 of the operational amplifier integrated circuit a4, and is higher than the voltage signal of the pin 3 of the reference flowmeter A3, which enters the operational amplifier integrated circuit a4, so that the operational amplifier integrated circuit a4 stops outputting a high level by the pin 1 under the action of its internal circuit and outputs a low level instead. When the detected flowmeter a2 has a count too low fault, that is, the output voltage signal is too low, the signal output from pin 3 of the detected flowmeter a2 is pressed into pin 5 of the operational amplifier integrated circuit a4, and is lower than the voltage signal of pin 6 of the reference flowmeter pin 3 entering the operational amplifier integrated circuit a4, so that the operational amplifier integrated circuit a4 stops outputting high level and outputs low level instead of outputting high level from pin 7 under the action of its internal circuit. No matter the detected flowmeter A2 has the count too high condition or the count too low condition because of the fault, when the 1 or 7 feet of the operational amplifier integrated circuit A4 output low level, the low level can enter the base of the PNP triode Q1 through the unidirectional conduction of the diode VD, the PNP triode Q1 conducts the collector to output high level and enter the positive power input end of the buzzer B, therefore, the buzzer B is powered on to give a sound prompt sound, and the detected flowmeter A2 prompts the inspector to have quality problems to maintain in time.

As shown in fig. 1 and 2, in actual detection, after the power switch of the regulated power supply a1 is turned on, the power output by the regulated power supply a1 will enter the time switch a5, and after a period of time (generally, only 30 seconds are needed for quality detection of the flow meter a2 to be detected), for example, after 40 seconds, the time switch a5 will output 5 seconds of power to enter the power input end of the buzzer B1 under the action of its internal circuit and the 3 and 4 pin output power time set by a technician, so that the buzzer B1 is powered on to generate a loud prompt sound to prompt the inspector that the flow meter a2 to be detected has no quality problem and the detection is finished. After the detection is finished, the detector takes down the detected flowmeter A2. It should be noted that, in order to realize accurate detection, the novel reference flowmeter body a3 needs to be checked and corrected (other gas flow standard calibration devices can be used for detection and verification) at certain intervals. This is novel has prevented that the people from reading the error and leading to the judged result mistake, has brought the facility for the measurement personnel from this, has improved detection work efficiency, and has guaranteed that the testing result is true effective. In fig. 2, the diode VD is model 1N 4007; the model of the PNP triode Q1 is 9012; the resistance R2 is 1K; the resistances of the resistors R1 and R3 are 22K; the buzzer B, B1 is an SF-12V active continuous audible alarm finished product, and the sounds emitted by the buzzer and the buzzer are different (the buzzer B emits an alarm sound, and the buzzer B1 emits a music sound) so as to be beneficial to specific distinguishing of detection personnel.

While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims (5)

1. A gas flow standard part calibration device comprises a reference flowmeter body, a stabilized voltage power supply and a shell; it is characterized in that the device also comprises a comparison circuit and a judgment circuit; the air inlet end and the air outlet end of the reference flowmeter body are positioned outside the two ends of the shell, the air inlet end of the reference flowmeter body is provided with a valve, and the upper end of the valve is connected with an air outlet pipe of an air compressor through a pipeline; the voltage-stabilized power supply, the comparison circuit and the judgment circuit are arranged in the element box; the signal output end of the reference flowmeter body is electrically connected with the first path of signal input end of the comparison circuit, and the signal output end of the detected flowmeter is electrically connected with the second path of signal input end of the comparison circuit.

2. A gas flow standard calibration device according to claim 1, wherein the housing has a viewing port at the upper front end.

3. The gas flow standard calibration device of claim 1, wherein the regulated power supply is an ac to dc switching power supply module.

4. The gas flow standard calibration device of claim 1, wherein the comparison circuit comprises a resistor, an operational amplifier integrated circuit, a diode, a PNP triode and a buzzer, the resistor, the operational amplifier integrated circuit, the diode, the PNP triode and the buzzer are electrically connected, a positive power input terminal of the operational amplifier integrated circuit is connected with an emitter of the PNP triode, a negative power input terminal of the operational amplifier integrated circuit is connected with a negative power input terminal of the buzzer, an output terminal of the operational amplifier integrated circuit is connected with a negative terminal of the diode, a positive terminal of the diode is connected with one end of the first resistor, the other end of the first resistor is connected with a base of the PNP triode, a collector of the PNP triode is connected with a positive power input terminal of the buzzer, one end of the second resistor is connected with a first reverse input terminal and a second non-phase input terminal of the operational amplifier integrated circuit, the first non-phase input terminal of the operational amplifier integrated circuit is connected with one end of the third resistor, the other end of the third resistor is connected with a second reverse input end of the operational amplifier integrated circuit.

5. The gas flow standard calibrating device of claim 1, wherein the determining circuit comprises a time switch and a buzzer, the time switch is electrically connected to the buzzer, and the power output terminal of the time switch is connected to the power input terminal of the buzzer.

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