Vortex shedding flowmeter calibration device capable of simulating wet airflow influence

Abstract

The utility model discloses a vortex shedding flowmeter calibration device capable of simulating wet airflow influence, which is characterized in that the output end of a gas tank is communicated with the input end of a temperature regulator through a pipeline, and the output end of the temperature regulator is respectively communicated with the input ends of a mixer, an evaporator and a detected meter through pipelines; the output end of the mixer is communicated with the input end of the commutator through a pipeline, the commutator is provided with a first output end and a second output end, the first output end is communicated with the atmosphere, the second output end is communicated with the input end of the detected meter, and the output end of the evaporator is communicated with the input end of the detected meter through a pipeline. The output end of the water tank is respectively communicated with the evaporator and the sprayer through pipelines, the output end of the detected meter is communicated with the input end of the standard device through a pipeline, and stop valves are arranged on a plurality of pipelines for connecting the components. According to the utility model, three comparative tests of a dry airflow routine test, a gas-liquid two-phase flow influence test and a moisture-containing airflow influence test are realized on the same main pipeline without moving a detected meter and a standard device.

Description

Technical Field

[0001] The utility model belongs to the technical field of calibration devices, and more specifically relates to a vortex flowmeter calibration device that can simulate the influence of wet air flow. Background Art

[0002] Vortex flowmeters can measure the flow rates of single-phase fluids such as gases, liquids, and steam, and are widely used in trade settlement and process control. They use a vortex generator placed in the fluid, and the fluid alternately separates and releases two regular staggered rows of vortices on both sides downstream of the vortex generator. Within a certain range of Reynolds numbers, the frequency of these vortices is related to the geometric dimensions of the vortex generator and the pipeline, and the frequency of the vortices is proportional to the flow rate. Currently, the factory calibration or periodic calibration of vortex flowmeters is carried out under single-phase flow conditions, such as using water or air as the medium for calibration. However, in the actual use environment of vortex flowmeters, they often have to face the influence of two-phase flow media. For example, when measuring wet steam, the medium actually flowing through the vortex flowmeter is a mixture of saturated steam and the liquid droplets separated from the saturated steam; when measuring the flow rate of an air compressor, if the air compressor's function of cooling and removing water is not good, the medium actually flowing through the vortex flowmeter is humidified air, or even a mixture of air and water droplets. In actual applications, it has been proven that wet air flow and gas-liquid two-phase flow have an adverse impact on the normal operation of vortex flowmeters (for example, there may be phenomena such as missed pulses or no pulses), but there is no specific device in the prior art to solve this technical problem on how to verify this influence through experiments, how to judge the degree of influence, and obtain regular content. Content of the Utility Model

[0003] In view of this, the utility model provides a vortex flowmeter calibration device that can simulate the influence of wet air flow, which can conduct conventional tests of dry air flow, influence tests of gas-liquid two-phase flow, and influence tests of wet air flow. Through the design of branch pipelines, three comparison tests can be realized on the same main pipeline without moving the meter under test and the standard device.

[0004] In order to achieve the above object, the utility model adopts the following technical solutions:

[0005] A vortex flowmeter calibration device capable of simulating the influence of wet air flow, comprising: an air tank, a temperature regulator, a mixer, an evaporator, a water tank, a commutator, a meter under test, a standard device, and a sprayer; the output end of the air tank is communicated with the input end of the temperature regulator through a pipeline, the output end of the temperature regulator is respectively communicated with the input ends of the mixer, the evaporator, and the meter under test through pipelines, the output end of the mixer is communicated with the input end of the commutator through a pipeline, the commutator is provided with a first output end and a second output end, the first output end is communicated with the atmosphere, the second output end is communicated with the input end of the meter under test, the output end of the evaporator is communicated with the input end of the meter under test through a pipeline, the output end of the water tank is respectively communicated with the evaporator and the sprayer through pipelines, the sprayer is arranged at the top of the mixer, the output end of the meter under test is communicated with the input end of the standard device through a pipeline, and stop valves are installed on multiple pipelines connecting each component.

[0006] Further, a stop valve A is installed on the pipeline connecting the air tank and the temperature regulator, a stop valve B is installed on the pipeline connecting the output end of the temperature regulator, a stop valve C is installed on the pipeline connecting the output end of the temperature regulator and the evaporator, a stop valve D is installed on the pipeline connecting the output end of the temperature regulator and the mixer, stop valves E and F are installed on the pipeline connecting the output end of the temperature regulator and the meter under test, a stop valve G is installed on the pipeline connecting the commutator and the meter under test, a stop valve H is installed on the pipeline connecting the evaporator and the meter under test, a stop valve I is installed on the pipeline connecting the evaporator and the water tank, and a stop valve J is installed on the pipeline connecting the water tank and the sprayer.

[0007] Further, a trap A is installed at the bottom of the mixer, and a trap B is installed at the bottom of the evaporator.

[0008] Further, a hygrometer A is installed on the evaporator.

[0009] Further, a flow regulating valve A is installed on the pipeline connecting the mixer and the commutator, a flow regulating valve B is installed on the pipeline connecting the evaporator and the meter under test, and a flow regulating valve C is installed on the pipeline between stop valves E and F.

[0010] Further, a flow stabilizer tank is also installed on the pipeline connecting the meter under test and the standard device, and a hygrometer B, a thermometer A, a pressure gauge A, and a trap C are installed on the flow stabilizer tank.

[0011] Further, a thermometer B and a pressure gauge B are installed on the pipeline connecting the meter under test and the flow stabilizer tank.

[0012] Further, the temperature regulator is also connected to the drying head through a pipeline, and a stop valve K is installed on the pipeline connecting the temperature regulator and the drying head.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. Through the design of the conventional test pipeline, the gas-liquid two-phase flow test pipeline, and the humidity test pipeline, the device of the present utility model can conduct tests on dry gas, gas-liquid two-phase flow with different proportions, and gas with different humidities, and regular results can be obtained.

[0015] 2. Through the design of the branch pipeline, the device of the present utility model does not need to move the meter under test and the standard device, and three comparison tests can be realized on the same main pipeline, saving installation space and being easy to implement and promote. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0017] Figure 1 It is a schematic structural diagram of the present utility model.

[0018] Among them, in the figure:

[0019] 1 - gas tank; 2 - temperature regulator; 3 - mixer; 4 - evaporator; 5 - water tank; 6 - commutator; 7 - meter under test; 8 - standard device; 9 - stop valve A; 10 - stop valve B; 11 - stop valve C; 12 - stop valve D; 13 - stop valve G; 14 - stop valve E; 15 - stop valve F; 16 - stop valve H; 17 - stop valve I; 18 - stop valve J; 19 - steam trap A; 20 - steam trap B; 21 - hygrometer A; 22 - flow regulating valve A; 23 - flow regulating valve B; 24 - flow regulating valve C; 25 - steady flow tank; 26 - hygrometer B; 27 - thermometer A; 28 - pressure gauge A; 29 - steam trap C; 30 - thermometer B; 31 - pressure gauge B; 32 - drying head; 33 - stop valve K; 34 - sprayer. Detailed Embodiments

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0021] Please refer to the attached Figure 1 , the present utility model provides a calibration device for a vortex flowmeter that can simulate the influence of wet air flow, including: an air tank 1, a temperature regulator 2, a mixer 3, an evaporator 4, a water tank 5, a commutator 6, a meter under test 7, a standard device 8, and a sprayer 34; the output end of the air tank 1 is communicated with the input end of the temperature regulator 2 through a pipeline, the output end of the temperature regulator 2 is respectively communicated with the input ends of the mixer 3, the evaporator 4, and the meter under test 7 through pipelines, the output end of the mixer 3 is communicated with the input end of the commutator 6 through a pipeline, the commutator 6 is provided with a first output end and a second output end, the first output end is communicated with the atmosphere, the second output end is communicated with the input end of the meter under test 7, the output end of the evaporator 4 is communicated with the input end of the meter under test 7 through a pipeline, the output end of the water tank 5 is respectively communicated with the evaporator 4 and the sprayer 34 through pipelines, the sprayer 34 is arranged on the top of the mixer 3, the output end of the meter under test 7 is communicated with the input end of the standard device 8 through a pipeline, and stop valves are installed on multiple pipelines connecting each component. The air tank 1 can output dry compressed gas with a certain pressure, the temperature regulator 2 can adjust the gas temperature to the test temperature, the mixer 3 is a cylindrical container, the upper surface is connected to the sprayer 34, and receives the atomized water droplets sprayed from the sprayer 34; the middle part of the mixer 3 is an air path, and when the air flow passes through, it can continuously carry away the atomized water droplets, thus forming a gas-liquid two-phase flow; since the state of the gas-liquid two-phase flow is not easy to maintain, it is necessary to design the commutator 6. When the gas-liquid two-phase is not yet stable, the mixed gas first flows out from the bypass of the commutator 6, and then switches back to the meter under test 7 when the gas-liquid two-phase is stable, so as to reduce the influence on the meter under test 7. The evaporator 4 can form gas with a certain humidity (until reaching the saturated humidity) through the evaporation process and outputs from the top of the evaporator 4; the sprayer 34 is a high-pressure nozzle, and liquid droplets with a certain shape and size can be sprayed into the air path through the sprayer 34;

[0022] A stop valve A9 is installed on the pipeline connecting the gas tank 1 and the temperature regulator 2. A stop valve B10 is installed on the pipeline connected to the output end of the temperature regulator 2. A stop valve C11 is installed on the pipeline where the pipeline at the output end of the temperature regulator 2 is connected to the evaporator 4. A stop valve D12 is installed on the pipeline where the pipeline at the output end of the temperature regulator 2 is connected to the mixer 3. A stop valve E14 and a stop valve F15 are installed on the pipeline where the pipeline at the output end of the temperature regulator 2 is connected to the meter under test 7. A stop valve G13 is installed on the pipeline connecting the commutator 6 and the meter under test 7. A stop valve H16 is installed on the pipeline connecting the evaporator 4 and the meter under test 7. A stop valve I17 is installed on the pipeline connecting the evaporator 4 and the water tank 5. A stop valve J18 is installed on the pipeline connecting the water tank 5 and the sprayer 34.

[0023] A trap A19 is installed at the bottom of the mixer 3, and a trap B20 is installed at the bottom of the evaporator 4.

[0024] A hygrometer A21 is installed on the evaporator 4 to measure the gas humidity at the evaporator 4.

[0025] A flow regulating valve A22 is installed on the pipeline connecting the mixer 3 and the commutator 6. A flow regulating valve B23 is installed on the pipeline connecting the evaporator 4 and the meter under test 7. A flow regulating valve C24 is installed on the pipeline between the stop valve E14 and the stop valve F15.

[0026] A flow stabilizer tank 25 is also installed on the pipeline connecting the meter under test 7 and the standard device 8. A hygrometer B26, a thermometer A27, and a pressure gauge A28 are installed on the flow stabilizer tank 25 to measure the humidity, temperature, and pressure values at the standard device 8. A trap C29 is installed at the bottom of the flow stabilizer tank 25.

[0027] A thermometer B30 and a pressure gauge B31 are installed on the pipeline connecting the meter under test 7 and the flow stabilizer tank 25 to measure the temperature and pressure values at the meter under test 7. The flow stabilizer tank 25 is used to stabilize the gas pressure, and the right side of the flow stabilizer tank 25 is the gas flow outlet at the end of the pipeline.

[0028] The temperature regulator 2 is also connected to a drying head 32 through a pipeline. A stop valve K33 is installed on the pipeline connecting the temperature regulator 2 and the drying head 32. The drying head 32 is used for purging, drying, and maintenance of various parts of the device.

[0029] Before the test of the device of the present utility model, all stop valves are in the closed state; and the present utility model can be used for the following tests:

[0030] 1. Conventional test of dry air flow

[0031] Open the globe valves A9, B10, E14 and F15, and adjust the instantaneous flow rate using the flow control valve C24. The gas flows out from the gas tank 1, through the globe valve A9, temperature regulator 2, globe valve B10, globe valve E14, flow control valve C24, globe valve F15, the meter under test 7, flow stabilizer tank 25 and standard device 8. After the gas flow stabilizes, start timing. After a period of time, record the cumulative pulse number, pressure and temperature value of the meter under test 7, as well as the cumulative volume, pressure and temperature value of the standard device 8, and then obtain the standard state volumes accumulated by the meter under test 7 and the standard device 8 respectively, so as to calculate the indication error of the meter under test 7.

[0032] 2. Gas-liquid two-phase flow influence test

[0033] Place the commutator 6 at the first output end; open the globe valves A9, B10, D12 and G13, and adjust the instantaneous flow rate using the flow control valve A22. The gas flows out from the gas tank 1, through the globe valve A9, temperature regulator 2, globe valve B10, globe valve D12, mixer 3, flow control valve A22 and commutator 6, and finally flows out from the first output end; open the globe valve J18, and the water tank 5 provides a pressurized water source for the sprayer 34. The sprayer 34 sprays atomized water droplets with a certain concentration and flow rate into the internal gas path of the mixer 3. When the gas flows through the gas path, these atomized water droplets can be continuously carried away, thus forming a gas-liquid two-phase flow; the excess water droplets in the mixer 3 are discharged from the bottom drain valve A19. After the gas flow stabilizes, switch the commutator 6 to the second output end. At this time, the gas flows out through the meter under test 7, flow stabilizer tank 25 and standard device 8; after a period of time, record the cumulative pulse number, pressure and temperature value of the meter under test 7, as well as the cumulative volume, pressure and temperature value of the standard device 8, and then obtain the standard state volumes accumulated by the meter under test 7 and the standard device 8 respectively, so as to calculate the indication error of the meter. By adjusting the spray pressure of the sprayer 34 and the gas path flow rate, the gas-liquid two-phase flow influence test with different flow rates and different gas-liquid ratios can be carried out.

[0034] 3. Humid gas flow influence test

[0035] Open the globe valves A9, B10, C11, H16 and I17, and use the regulating valve B23 to adjust the instantaneous flow rate. The gas flows out from the gas tank 1, through the globe valve A9, temperature regulator 2, globe valve B10, globe valve C11, evaporator 4, regulating valve B23, globe valve H16, the meter under test 7, flow stabilizer tank 25, and standard device 8; the evaporator 4 turns a part of the water flowing into it into water vapor, and the water vapor is fully mixed with the gas flowing into it and then discharged; the excess liquid inside is discharged from the bottom drain valve B20. After the wet gas flow stabilizes, start timing. After a period of time, record the cumulative pulse number, pressure, temperature and humidity values of the meter under test 7, as well as the cumulative volume, pressure, temperature and humidity values of the standard device 8, and then obtain the standard state volumes accumulated by the meter under test 7 and the standard device 8 respectively, so as to calculate the indication error of the meter under test 7. By adjusting the power, gas flow rate and temperature of the evaporator 4, the influence tests of wet gas flows with different flow rates, temperatures and humidities can be carried out.

[0036] 4. Comparative Test

[0037] Compare the results obtained in Test 2 and Test 3 with the results of the conventional test 1 of dry gas flow under the same pressure, temperature and flow rate, and the regular results of the influence of gas-liquid two-phase flow and wet gas flow on the vortex flowmeter can be obtained.

[0038] 5. Drying Operation

[0039] Open the globe valve K33, and use the drying head 32 to purge and dry each part of the device to prevent damage to the pipeline and components caused by water droplets, moisture, etc.

[0040] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A vortex flowmeter calibration device capable of simulating the influence of wet air flow, characterized in that: include: A gas tank (1), a temperature regulator (2), a mixer (3), an evaporator (4), a water tank (5), a commutator (6), a meter to be tested (7), a standard device (8) and a sprayer (34); the output end of the gas tank (1) is connected to the input end of the temperature regulator (2) through a pipeline, the output end of the temperature regulator (2) is connected to the input ends of the mixer (3), the evaporator (4) and the meter to be tested (7) through pipelines, the output end of the mixer (3) is connected to the input end of the commutator (6) through a pipeline, and the commutator (6) is provided with There are a first output end and a second output end, the first output end is connected to the atmosphere, the second output end is connected to the input end of the meter to be tested (7), the output end of the evaporator (4) is connected to the input end of the meter to be tested (7) through a pipeline, the output end of the water tank (5) is connected to the evaporator (4) and the sprayer (34) through pipelines, respectively, the sprayer (34) is arranged on the top of the mixer (3), the output end of the meter to be tested (7) is connected to the input end of the standard device (8) through a pipeline, and stop valves are installed on the multiple pipelines connecting the various components.

2. A vortex flowmeter calibration device capable of simulating the influence of wet airflow according to claim 1, characterized in that: A stop valve A (9) is installed on the pipeline connecting the gas tank (1) and the temperature regulator (2), a stop valve B (10) is installed on the pipeline connected to the output end of the temperature regulator (2), a stop valve C (11) is installed on the pipeline connecting the output end of the temperature regulator (2) and the evaporator (4), a stop valve D (12) is installed on the pipeline connecting the output end of the temperature regulator (2) and the mixer (3), and a stop valve C (11) is installed on the pipeline connecting the output end of the temperature regulator (2) and the evaporator (4). A stop valve E (14) and a stop valve F (15) are installed on the pipeline connecting the meter to be tested (7), a stop valve G (13) is installed on the pipeline connecting the reversing device (6) and the meter to be tested (7), a stop valve H (16) is installed on the pipeline connecting the evaporator (4) and the meter to be tested (7), a stop valve I (17) is installed on the pipeline connecting the evaporator (4) and the water tank (5), and a stop valve J (18) is installed on the pipeline connecting the water tank (5) and the sprinkler (34).

3. A vortex flowmeter calibration device capable of simulating the influence of wet airflow according to claim 1, characterized in that: A steam trap A (19) is installed at the bottom of the mixer (3), and a steam trap B (20) is installed at the bottom of the evaporator (4).

4. A vortex flowmeter calibration device capable of simulating the influence of wet air flow according to claim 1, characterized in that: The evaporator (4) is provided with a hygrometer A (21).

5. A vortex flowmeter calibration device capable of simulating the influence of wet air flow according to claim 2, characterized in that: A flow regulating valve A (22) is installed on the pipeline connecting the mixer (3) and the reversing device (6), a flow regulating valve B (23) is installed on the pipeline connecting the evaporator (4) and the meter under test (7), and a flow regulating valve C (24) is installed on the pipeline between the stop valve E (14) and the stop valve F (15).

6. A vortex flowmeter calibration device capable of simulating the influence of wet airflow according to claim 1, characterized in that: A simmering pot (25) is also installed on the pipeline connecting the meter under test (7) and the standard device (8), and a hygrometer B (26), a thermometer A (27), a pressure gauge A (28) and a steam trap C (29) are installed on the simmering pot (25).

7. A vortex flowmeter calibration device capable of simulating the influence of wet air flow according to claim 6, characterized in that: A thermometer B (30) and a pressure gauge B (31) are installed on the pipeline connecting the meter to be tested (7) and the simmering tank (25).

8. A vortex flowmeter calibration device capable of simulating the influence of wet airflow according to claim 1, characterized in that: The temperature regulator (2) is also connected to the drying head (32) through a pipeline, and a stop valve K (33) is installed on the pipeline connecting the temperature regulator (2) and the drying head (32).

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