CN207515851U - A kind of novel precession Vortex flow device suitable for variable grain concentration gases - Google Patents

Abstract

The utility model discloses a novel precession vortex flow device suitable for gases with different particle concentrations. The gas particle concentration detector is arranged on the front pipeline in front of the shell, and the measured gas passing through the gas particle concentration detector enters the inner flow channel of the shell, and the inner flow channel is equipped with a spinner and a derotator; the gas particle concentration The detector is connected to the display and processing device; the line switching device is arranged on the top of the housing, one end of the line switching device is connected to the display and processing device, and the other end of the line switching device is connected to three piezoelectric sensors respectively, and the probe end of the piezoelectric sensor is downward protruding into the flow channel in the housing. The utility model automatically corrects and switches the position of the piezoelectric sensor and the preset instrument coefficient according to different gas particle concentrations, so as to achieve the purpose of accurately measuring the flow rate.

Description

A new type of precession vortex flow device suitable for gases with different particle concentrations

technical field

The utility model relates to a novel precession vortex flow device, in particular to a precession vortex flow device which is suitable for gases with different particle concentrations and can automatically adjust preset instrument coefficients and piezoelectric sensor positions.

Background technique

Precession vortex flow devices are also playing an increasingly important role in daily life. In many industrial fields, precession vortex flowmeters also play an essential role. Flow measurement devices in the chemical industry not only maintain the stability of chemical reactions but also avoid unnecessary waste and danger. However, the traditional precession vortex flow devices currently on the market are suitable for a relatively single use environment, and their measurement accuracy is greatly affected by environmental conditions.

For example, in construction sites or industrial production where the concentration of gas particles is high, due to the influence of particles on the flow of gas inside the flowmeter, the measurement accuracy of traditional precession vortex flow devices will be greatly reduced. The coefficient differs greatly from the instrument coefficient in the actual particle concentration gas, which directly leads to a huge deviation in the measurement results. Inaccurate flow measurement will cause huge hidden dangers and dangerous accidents in industrial production. Based on this, the utility model proposes a precession vortex flow device that is suitable for gases with different particle concentrations and can automatically adjust the preset instrument coefficient and the position of the piezoelectric sensor.

Utility model content

Aiming at the above problems, the utility model proposes a precession vortex flow device suitable for gases with different particle concentrations, which can automatically adjust the preset instrument coefficient and the position of the piezoelectric sensor.

The technical scheme of the utility model is:

The utility model includes a gas particle concentration detector, a housing, an alarm lamp, a spinner, a piezoelectric sensor I, a piezoelectric sensor II, a piezoelectric sensor III, a line switching device and a derotator; the gas particle concentration detector is arranged in On the pre-pipeline in front of the shell, the inlet end of the pre-pipeline is connected to the inlet flange, and the outlet end of the shell is connected to the outlet flange. The measured gas passing through the gas particle concentration detector enters the inner flow channel of the shell. The inlet and outlet of the inner channel are respectively equipped with a spinner and a derotator; the gas particle concentration detector is connected to the particle concentration signal input interface of the display and processing device through a data transmission line; the line switching device is arranged on the top of the housing. One end of the line switching device is connected to the line switching signal output interface of the display and processing device through the main control line of the piezoelectric sensor, and the other end of the line switching device is connected to the Piezoelectric sensor Ⅰ, piezoelectric sensor Ⅱ and piezoelectric sensor Ⅲ are connected, piezoelectric sensor Ⅰ, piezoelectric sensor Ⅱ and piezoelectric sensor Ⅲ are all installed on the top of the shell, and the probe end of the piezoelectric sensor extends downward into the shell to flow in the way.

The gas particle concentration detector transmits the detected gas particle concentration value to the display and processing device through the data transmission line, and the display and processing device stores the corresponding standard instrument coefficients under different gas particle concentrations, and is detected by the gas particle concentration. The gas particle concentration value detected by the meter selects the corresponding standard meter coefficient as the preset meter coefficient.

The piezoelectric sensor Ⅰ, piezoelectric sensor Ⅱ and piezoelectric sensor Ⅲ are arranged at intervals along the axial direction of the flow channel in the casing from the inlet end to the outlet end, and the piezoelectric sensor Ⅰ, piezoelectric sensor Ⅱ and piezoelectric sensor Ⅲ are respectively used It is used to determine the vortex core frequency of normal particle concentration, medium particle concentration and high particle concentration gas.

The piezoelectric sensor uses the pressure pulsation frequency collected by itself as the vortex core frequency, collects the gas particle concentration value through the gas particle concentration detector, finds the preset instrument coefficient according to the gas particle concentration value, and uses the vortex core frequency and preset The instrument factor calculates the flow rate of the gas to be measured and displays it on the display and processing device.

The housing is also equipped with a temperature sensor, which extends into the inner channel of the housing through the installation hole provided on the housing, and the temperature sensor is connected to the display and processing device through the temperature sensor transmission line.

The applicant of the utility model has found through experiments that the gas passing through the spinner generates a vortex, and the vortex enters the contraction section, throat and expansion section passing through the flow channel in the shell to make the vortex core shift. As shown in Figure 3, the normal particle concentration The trajectory of the gas vortex nucleus is biased to the piezoelectric sensor I, the trajectory of the medium particle concentration gas is biased to the piezoelectric sensor II, and the trajectory of the high particle concentration gas is biased to the piezoelectric sensor III.

According to the offset value of the vortex core of gases with different particle concentrations under the precession vortex flow device, the utility model divides the measured gas particle concentration into four categories: 1. The particle concentration is greater than 0mg/ ^m3 and less than 1.5mg/m3 ³ : Normal particle concentration measurement; 2. When the particle concentration is ^greater than 1.5mg/ ^m3 and less than 10mg/m3, it is medium particle concentration measurement; 3. When the particle concentration is greater than 10mg/ ^m3 and less than 50mg/ ^m3 , it is high particle concentration Concentration measurement; 4. When the particle concentration is greater than 50mg/ ^m3 , it exceeds the accurate measurement range of the flowmeter. The measured gas particle concentration value detected by the gas particle concentration detector is divided into four categories, and each category corresponds to a preset instrument coefficient (can be obtained by determining the relationship between the two according to the experimental fitting), and generates a corresponding output signal , the signal is sent to the line switching device through the line switching output interface 18 and the main control line of the piezoelectric sensor.

As shown in Figure 5, the line switching device receives the output signal and automatically switches the three lines of piezoelectric sensor transmission line I, piezoelectric sensor transmission line II and piezoelectric sensor transmission line III to ensure that only one most suitable detection line is opened at any time. Both lines are closed.

As shown in Figure 1, an alarm light is installed on the top of the gas particle concentration detector. When the gas particle concentration detector detects that the particle concentration of the measured gas is greater than 50mg/ ^m3 , the particle concentration of the gas is too large to exceed the flowmeter. Accurately measure the range, the alarm light starts flashing alarm.

When arranging the line switching device, its relative position on the housing should be considered, and it should match the size of the housing. The lengths of the piezoelectric sensor I, piezoelectric sensor II and piezoelectric sensor III should match the size of the flow channel in the housing to reduce the impact on the gas internal flow field. The size of the spinner and derotator should match the size of the flow channel in the shell.

The technical effect of the utility model is:

The utility model will not be affected by the gas particle concentration of the measured environment on the measured gas flow measurement, and realizes a precession vortex flow suitable for gases with different particle concentrations that can automatically adjust the preset instrument coefficient and the position of the piezoelectric sensor The device ensures the accuracy of measurement and reduces the potential hidden danger of accidents in industrial production.

Description of drawings

Figure 1 is a general view of the measurement system of the new precession vortex flow device;

Figure 2 is a half-sectional view of the measurement system of the new precession vortex flow device;

Fig. 3 is a schematic diagram of the trajectory of the gas vortex core with three particle concentrations;

Fig. 4 is a detailed diagram of the line switching system;

Fig. 5 is an overall view of the novel precession vortex flow device.

In the figure: inlet flange 1, gas particle concentration detector 2, alarm lamp 3, data transmission line 4, housing 5, spinner 6, piezoelectric sensor Ⅰ7, piezoelectric sensor Ⅱ8, piezoelectric sensor Ⅲ9, line switching device 10. Piezoelectric sensor main control line 11, temperature sensor 12, derotator 13, outlet flange 14, display and processing device 15, total signal output interface 16, particle concentration signal input interface 17, line switching signal output interface 18, Pressure sensor 19, normal particle concentration gas vortex core trajectory 20, medium particle concentration gas vortex core trajectory 21, high particle concentration gas vortex core trajectory 22, piezoelectric sensor transmission line I23, piezoelectric sensor transmission line II24, piezoelectric sensor transmission line III25, temperature Sensor transmission line 26.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further.

As shown in Figure 1, the specific implementation of the utility model includes a gas particle concentration detector 2, a housing 5, a warning light 3, a spinner 6, a piezoelectric sensor I7, a piezoelectric sensor II8, a piezoelectric sensor III9, and a circuit switching device 10 and a racemizer 13; the gas particle concentration detector 2 is arranged on the front pipeline in front of the housing 5, the inlet end of the front pipeline is connected to the inlet flange 1, and the outlet end of the housing 5 is connected to the outlet flange 19 The gas particle concentration detector 2 is used to detect the particle concentration of the gas to be measured. The gas to be measured through the gas particle concentration detector 2 enters the inner flow channel of the housing 5, and the inlet and outlet ends of the inner flow channel are respectively equipped with rotator 6 and derotator 13; the gas particle concentration detector 2 is connected to the particle concentration signal input interface 17 of the display and processing device 15 through the data transmission line 4.

As shown in Figure 4, the line switching device 10 is arranged on the top of the housing 5, and one end of the line switching device 10 is connected to the line switching signal output interface 18 of the display and processing device 15 through the piezoelectric sensor master control line 11, and the line switching device 10 is connected to the line switching signal output interface 18 of the display and processing device 15. One end is respectively connected to piezoelectric sensor I7, piezoelectric sensor II8 and piezoelectric sensor III9 through piezoelectric sensor transmission line I23, piezoelectric sensor transmission line II24 and piezoelectric sensor transmission line III25, and piezoelectric sensor transmission line I23 is connected to piezoelectric sensor I7. The piezoelectric sensor transmission line II24 is connected to the piezoelectric sensor II8, the piezoelectric sensor transmission line III25 is connected to the piezoelectric sensor III9, the piezoelectric sensor I7, the piezoelectric sensor II8 and the piezoelectric sensor III9 are all installed on the top of the housing 5, and the piezoelectric sensor 14 The probe end extends downwards into the inner flow channel of the casing 5 .

As shown in Figure 5, a temperature sensor 12 is also installed on the housing 5, which extends into the inner flow channel of the housing 5 through the mounting hole provided on the housing 5, and the temperature sensor 12 is connected to the display and display via the temperature sensor transmission line 26. In the processing device 15 , the display and processing device 15 is provided with an adjustment signal output interface 10 , and the temperature sensor transmission line 26 is connected to the adjustment signal output interface 10 .

The display and processing device 15 is provided with a total signal output interface 16, and the total signal output interface 16 is connected to an external console, so as to achieve the purpose of importing all detection data into the console.

The gas particle concentration detector 2 transmits the detected gas particle concentration value to the display and processing device 15 through the data transmission line 4. The display and processing device 15 stores the corresponding standard instrument coefficients under different gas particle concentrations, and the gas particle concentration is determined by the gas particle concentration. The gas particle concentration value detected by the detector 2 selects the corresponding standard meter coefficient as the preset meter coefficient.

As shown in Figure 4, piezoelectric sensor I7, piezoelectric sensor II8 and piezoelectric sensor III9 are arranged at intervals along the axial direction of the inner flow channel of the housing 5 from the inlet end to the outlet end, and the piezoelectric sensor I7, piezoelectric sensor II8 and piezoelectric sensor Electric sensor III9 is used to measure the vortex core frequency of normal particle concentration, medium particle concentration and high particle concentration gas respectively.

The gas particle concentration value is transmitted to the processor of the new precession vortex flow device in the form of different frequency pulse voltage signals, and the processor classifies the particle concentration of the detected gas according to the voltage signal of different pulse frequency and outputs different frequency and amplitude Value voltage signal: When the particle concentration is greater than 0mg/ ^m3 and less than 1.5mg/ ^m3 , it is a normal particle concentration measurement, outputting a voltage signal of low frequency and low amplitude to the line automatic switching device; the particle concentration is greater than 1.5mg/m3 ³ and less than 10mg/m ³ is medium particle concentration measurement, and output a voltage signal with low frequency and high amplitude to the line automatic switching device; when the particle concentration is greater than 10mg/m ³ and less than 50mg/m ³ is high particle concentration measurement, Output high-frequency and high-amplitude voltage signals to the line automatic switching device; when the particle concentration is greater than 50mg/ ^m3 and exceeds the accurate measurement range of the flowmeter, the pulse voltage signal will be output to the alarm light, and no signal will be output to the alarm light when it is on. In the line automatic switching device, the flow meter stops working.

When the line automatic switching device receives a low-frequency and low-amplitude voltage signal, the line automatic switching device will connect the piezoelectric sensor transmission line Ⅰ, and the piezoelectric sensor transmission line Ⅱ and piezoelectric sensor transmission line Ⅲ will be disconnected to make the piezoelectric sensor Ⅰ starts measurement, piezoelectric sensor II and piezoelectric sensor III do not measure; when the line automatic switching device receives a voltage signal of low frequency and high amplitude, the line automatic switching device will connect the piezoelectric sensor transmission line II, and the piezoelectric sensor Both the transmission line I and the piezoelectric sensor transmission line III are disconnected so that the piezoelectric sensor II starts to measure, and the piezoelectric sensor I and piezoelectric sensor III do not perform measurement; when the line automatic switching device receives a high-frequency and high-amplitude voltage signal , the line automatic switching device will connect the piezoelectric sensor transmission line III, the piezoelectric sensor transmission line II and the piezoelectric sensor transmission line I are disconnected so that the piezoelectric sensor III starts to measure, and the piezoelectric sensor II and piezoelectric sensor I do not perform measurement.

The piezoelectric sensors 7, 8, and 9 use the pressure pulsation frequency collected by themselves as the vortex core frequency, collect the gas particle concentration value through the gas particle concentration detector 2, find the preset instrument coefficient according to the gas particle concentration value, and pass the vortex core frequency The flow rate of the gas to be measured is calculated and displayed on the display and processing device 15 according to the preset instrument coefficient, so as to achieve the purpose of accurately measuring the flow rate of gases with different particle concentrations.

Specifically, the following formula is used to calculate the gas flow through the vortex core frequency and the preset instrument coefficient:

Q=f/K

Among them, Q represents the flow rate, f represents the frequency of the vortex core, and K represents the preset meter factor.

According to different gas particle concentrations, the position of the piezoelectric sensor and the preset meter coefficient are automatically corrected and switched to achieve the purpose of accurately measuring the flow rate.

Claims (3)

1. A new type of precession vortex flow device suitable for gases with different particle concentrations, characterized in that it includes a gas particle concentration detector (2), a housing (5), a warning light (3), and a spinner (6) , piezoelectric sensor I (7), piezoelectric sensor II (8), piezoelectric sensor III (9), line switching device (10) and derotator (13); the gas particle concentration detector (2) is arranged in the shell On the pre-pipeline in front of the body (5), the inlet end of the pre-pipeline is connected to the inlet flange (1), the outlet end of the housing (5) is connected to the outlet flange (19), and the gas particle concentration detector ( 2) The gas to be measured enters the inner channel of the casing (5), and the inlet and outlet of the inner channel are respectively equipped with a spinner (6) and a derotator (13); the gas particle concentration detector (2 ) is connected to the particle concentration signal input interface (17) of the display and processing device (15) through the data transmission line (4); the line switching device (10) is arranged on the top of the housing (5), and one end of the line switching device (10) is pressed The electric sensor main control line (11) is connected to the line switching signal output interface (18) of the display and processing device (15), and the other end of the line switching device (10) passes through the piezoelectric sensor transmission line I (23) and the piezoelectric sensor transmission line respectively. Ⅱ(24) and piezoelectric sensor transmission line Ⅲ(25) are connected with piezoelectric sensor Ⅰ(7), piezoelectric sensor Ⅱ(8) and piezoelectric sensor Ⅲ(9), piezoelectric sensor Ⅰ(7), piezoelectric Both the sensor II (8) and the piezoelectric sensor III (9) are installed on the top of the housing (5), and the probe end of the piezoelectric sensor (14) extends downward into the inner flow channel of the housing (5). 2. A novel precession vortex flow device suitable for gases with different particle concentrations according to claim 1, characterized in that: said piezoelectric sensor I (7), piezoelectric sensor II (8) and piezoelectric The sensor III (9) is arranged at intervals along the axial direction of the inner flow channel of the casing (5) from the inlet end to the outlet end. 3. A new type of precession vortex flow device suitable for gases with different particle concentrations according to claim 1, characterized in that: the housing (5) is also equipped with a temperature sensor (12), which passes through the housing The installation hole provided on the body (5) extends into the inner flow channel of the casing (5), and the temperature sensor (12) is connected to the display and processing device (15) through the temperature sensor transmission line (26).