CN214538085U - High-precision low-flow gas flowmeter - Google Patents
High-precision low-flow gas flowmeter Download PDFInfo
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- CN214538085U CN214538085U CN202120902880.7U CN202120902880U CN214538085U CN 214538085 U CN214538085 U CN 214538085U CN 202120902880 U CN202120902880 U CN 202120902880U CN 214538085 U CN214538085 U CN 214538085U
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Abstract
The utility model discloses a high-precision low-flow gas flowmeter, the front and back two sides of a metering box are provided with a metering cavity, the metering cavity is provided with a telescopic volume cavity, a shell is provided with an air inlet pipe orifice and an air outlet pipe orifice, the telescopic volume cavity is connected with a link mechanism, an articulated frame is connected between the link mechanisms, a rotating shaft is connected with the articulated frame, the rotating shaft is connected with a magnetic steel, and a magnetic coding chip is arranged on the inner side wall outside the shell and corresponds to the magnetic steel; the control circuit board is arranged in the shell, and the display panel is arranged on the shell. The utility model discloses utilize scalable volume chamber pressure differential mode drive connecting rod mechanism, coupling mechanism drives the magnet steel through articulated frame and rotates, and the rotation signal of magnet steel is sensed to the magnetic encoding chip, shows through display panel analysis processes through control circuit board, and temperature sensor and pressure sensor carry out the warm-pressing compensation, plan to carry out the correction of flow value, make the flowmeter have operating mode flow and standard condition flow; the gas metering device is free from the interference of external environment in the metering process, can improve the metering precision, and is suitable for high-precision low-flow gas metering.
Description
Technical Field
The utility model belongs to the technical field of gas flow detects technique and specifically relates to a low flow gas flowmeter of high accuracy.
Background
In the prior art, in industrial monitoring and gas flow measurement, a flow meter is generally required to be used, and a target flow meter is generally adopted, as shown in fig. 1, the structure of the target flow meter in the prior art is shown, and includes a pipe 23, a measuring pipe 18 and a display 19, the measuring pipe 18 is installed outside the pipe 23, a capacitive force sensor 20, a measuring rod 21 and a flow blocking piece 22 are arranged in the measuring pipe 18, the flow blocking piece 22 is connected with the capacitive force sensor 20 through the measuring rod 21, the capacitive force sensor 20 is connected with the display 19, and during work measurement; when the medium flows in the measuring tube 18, the pressure difference is generated by the flow-blocking piece 22 (target) through its own kinetic energy, and a force acts on the flow-blocking piece 22, and the magnitude of the acting force is in proportion to the square of the flow velocity of the medium; the acting force received by the choke piece 22 (target) is transmitted to the capacitive force sensor 20 through the measuring rod 21 which is rigidly connected, and the capacitive force sensor 20 generates a voltage signal to output; after the voltage signal is pre-amplified, AD converted and computer processed (a pre-amplifier, an AD converter and a computer processor are arranged in the display), the corresponding instantaneous flow and the accumulated total amount can be obtained.
However, the target flowmeter has some defects in practical use, the flow resisting piece is easy to fall off and influence normal use, and in addition, the flow resisting piece is easy to influence environmental vibration and influence metering precision, and the measuring range is narrow, so that the measuring precision is not high; the device is not suitable for low-flow high-precision gas metering.
Therefore, it is necessary to provide a high-precision low-flow gas flowmeter.
SUMMERY OF THE UTILITY MODEL
To the not enough of existence among the above-mentioned prior art, the utility model aims to provide a low flow gas flowmeter of high accuracy to solve above-mentioned problem.
A high-precision low-flow gas flowmeter comprises a shell, a metering box, a telescopic volume cavity, link mechanisms, a rotating shaft, magnetic steel, a magnetic coding chip, a control circuit board and a display panel, wherein the metering box is arranged in the shell, the metering cavity is formed in the front side part and the rear side part of the metering box, the telescopic volume cavity is installed in the metering cavity, an air inlet pipe orifice and an air outlet pipe orifice are formed in the upper part of the shell, the air inlet pipe orifice is communicated with the shell, the air outlet pipe orifice is communicated with the metering cavity, one end of each link mechanism is connected to the telescopic volume cavity, a hinge frame is connected between the two link mechanisms, one end of the rotating shaft is connected to the middle position of the hinge frame, the other end of the rotating shaft is connected with the magnetic steel, and the magnetic coding chip is installed on the inner wall of the shell and corresponds to the magnetic steel; the control circuit board is arranged in the shell, and the display panel is arranged at the front part of the shell.
Preferably, the magnetic coding chip and the display panel are both connected with the control circuit board.
Preferably, the inner lower part of the air outlet pipe orifice is provided with a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are electrically connected to the control circuit board.
Preferably, the control circuit board is connected with a communication module and arranged in the shell.
Preferably, the communication module is wirelessly connected with the mobile device.
Preferably, the communication module is a WiFi module or a bluetooth module, and the mobile device end is a mobile phone or a tablet computer.
Preferably, the link mechanism comprises a telescopic volume cavity shift lever, a rotating rod, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod and a sliding block, one end of the telescopic volume cavity shift lever is fixed to the telescopic volume cavity, the other end of the rotating rod is fixed to the rotating rod, the rotating rod is fixed to the first connecting rod, the first connecting rod is fixed to the second connecting rod, and the second connecting rod is hinged to the third connecting rod and the fourth connecting rod respectively.
Preferably, the third link is hinged to the hinge bracket, and the fourth link is connected to the slider.
Compared with the prior art, the utility model utilizes the pressure difference mode of the telescopic volume cavity to drive the connecting rod mechanism, the connecting mechanism drives the magnetic steel to rotate through the hinged frame, the magnetic coding chip senses the rotation signal of the magnetic steel, the rotation signal is displayed through the display panel after being analyzed and processed by the control circuit board, in addition, the temperature sensor and the pressure sensor are arranged to perform temperature and pressure compensation, the correction of the flow value is planned, and the standard flowmeter has the working condition flow and the standard condition flow; the gas metering device can not be interfered by external environment in the metering process, can improve the metering precision, and is suitable for high-precision low-flow gas metering.
Drawings
FIG. 1 is a block diagram of a prior art target flowmeter;
FIG. 2 is a schematic diagram of the high accuracy low flow gas meter of the present invention;
fig. 3 and 4 are internal structural views of the present invention;
fig. 5 is a side view of the inside of the housing of the present invention;
FIG. 6 is a diagram of the structure of the metering box of the present invention;
FIG. 7 is a cross-sectional view of the inside of the measuring tank of the present invention;
FIG. 8 is a schematic view of the connection between the hinge frame and the two link mechanism according to the present invention;
FIG. 9 is a schematic view of the connection between the hinge frame and the magnetic encoding chip of the present invention;
fig. 10 is a structural view of a link mechanism of the present invention;
fig. 11 is a block diagram of a control circuit board module according to the present invention.
Reference numbers in the figures: 1. a housing; 2. a batch tank; 3. a collapsible volume chamber; 4. a link mechanism; 5. a hinged frame; 6. a rotating shaft; 7. magnetic steel; 8. a magnetic encoding chip; 9. a control circuit board; 10. a display panel; 11. an air inlet pipe orifice; 12. an air outlet pipe orifice; 13. a metering chamber; 14. a temperature sensor; 15. a pressure sensor; 16. a communication module; 17. a mobile device end; 18. a measurement tube; 19. a display; 20. a capacitive force sensor; 21. a measuring rod; 22. a flow-impeding component; 23. a pipeline; 401. a retractable volume cavity deflector rod; 402. a rotating rod; 403. a first link; 404. a second link; 405. a third link; 406. a fourth link; 407. a slide block.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 2 and fig. 3 to 11, a high-precision low-flow gas flowmeter comprises a casing 1, a metering box 2, a scalable volume cavity 3, a link mechanism 4, a rotating shaft 6, magnetic steel 7, a magnetic coding chip 8, a control circuit board 9 and a display panel 10, wherein the metering box 2 is arranged in the casing 1, metering cavities 13 are arranged on the front side and the rear side of the metering box 2, the scalable volume cavity 3 is arranged in the metering cavities 13, an air inlet pipe 11 and an air outlet pipe 12 are arranged on the upper portion of the casing 1, the air inlet pipe 11 is communicated with the casing 1, the air outlet pipe 12 is communicated with the metering cavities 13, one end of the link mechanism 4 is connected with the scalable volume cavity 3, a hinge frame 5 is connected between the two link mechanisms 4, one end of the rotating shaft 6 is connected to the middle position of the hinge frame 5, the other end of the rotating shaft 6 is connected with the magnetic steel 7, the magnetic coding chip 8 is arranged on the outer wall of the shell 1 and corresponds to the magnetic steel 7; the control circuit board 9 is disposed outside the housing 1, and the display panel 10 is mounted on an outer end surface of the housing 1.
Wherein the magnetic coding chip is iC-MHL100 coding chip.
Further, the magnetic coding chip 8 and the display panel 10 are both connected with the control circuit board 9.
Further, a pressure sensor 15 and a temperature sensor 14 are arranged at the inner lower part of the air outlet pipe orifice 12, and the pressure sensor 15 and the temperature sensor 14 are electrically connected to the control circuit board 9.
The beneficial effects of the further technical scheme are that: the pressure sensor 15 and the temperature sensor 14 can sense the pressure of gas flow and the temperature of gas respectively; and (4) performing temperature and pressure compensation, and correcting the flow value to ensure that the standard flowmeter has working condition flow and standard condition flow.
Wherein the temperature sensor adopts SA1XL-J NTC temperature sensing chip, and the pressure sensor adopts IC MPX5700GS pressure sensing chip; and temperature sensors and pressure sensors of other types can be selected according to the use condition, and the method is not limited to the types.
Further, the control circuit board 9 is connected with a communication module 16 and is arranged outside the housing 1.
The beneficial effects of the further technical scheme are that: the communication module 16 is wirelessly connected to the mobile equipment terminal 17, and can display the temperature, pressure, standard condition flow, accumulated flow and the like of the gas through the mobile equipment terminal 17; the communication module 16 adopts a WiFi module or a Bluetooth module; the mobile device terminal 17 is a mobile phone or a tablet computer.
Further, the link mechanism 4 includes a retractable volume cavity shift lever 401, a rotating lever 402, a first connecting rod 403, a second connecting rod 404, a third connecting rod 405, a fourth connecting rod 406, and a slider 407, one end of the retractable volume cavity shift lever 401 is fixed to the retractable volume cavity 3, the other end of the rotating lever 402 is fixed to the first connecting rod 403, the first connecting rod 403 is fixed to the second connecting rod 404, and the second connecting rod 404 is hinged to the third connecting rod 405 and the fourth connecting rod 406, respectively.
Further, the third link 405 is hinged to the hinge frame 5, and the fourth link 406 is connected to the sliding block 407; the slide 407 serves as a guide.
The working principle of the connecting mechanism 4 of the flowmeter is similar to that of the diaphragm gas meter in the prior art,
the working principle of the diaphragm gas meter is as follows: when flowing gas passes through the gas meter, the flowing gas is blocked by pipeline friction and a mechanism, pressure difference is generated at the two ends of the inlet and the outlet of the gas meter by the internal gas, a diaphragm of the diaphragm gas meter is pushed to move in a metering chamber by the pressure difference, and a gas distribution mechanism is driven to distribute gas in a coordinated manner, so that the movement of the diaphragm can be continuously and reciprocally carried out, the linear reciprocating motion of the diaphragm gas meter is converted into circular motion by an internal mechanical structure, and then the mechanical roller counter is driven to rotate by the circular motion; and a certain amount of gas is discharged every time the diaphragm reciprocates, and finally the roller rotates by a counting unit to realize the rotation metering display effect of the roller.
And the utility model discloses a replace the mechanical gyro wheel counter of prior art diaphragm type gas table into magnet steel 7 and magnetic coding chip 8.
Compared with the prior art, the utility model discloses beneficial effect: the connecting rod mechanism 4 is driven by a telescopic volume cavity pressure difference mode, the connecting mechanism 4 drives the magnetic steel 6 to rotate through the hinged frame 5, the magnetic coding chip 8 senses a rotating signal of the magnetic steel 7, the rotating signal is analyzed and processed by the control circuit board 9 and is displayed by the display panel 10, and the temperature sensor 14 and the pressure sensor 15 are additionally arranged to perform temperature and pressure compensation and correct a flow value to enable the standard flowmeter to have working condition flow and standard condition flow; the gas metering device can not be interfered by external environment in the metering process, can improve the metering precision, and is suitable for high-precision low-flow gas metering.
Precision grade: class 0.5 (± 1% below 0.2Qmax, and ± 0.5% above 0.2 Qmax); flow measurement range: 0.1m3/h～6m3H; flow measurement range: wide range, range ratio is 1: 60, adding a solvent to the mixture; high precision: the error is less than or equal to plus or minus 0.5 percent (relative error).
The working principle is as follows: when flowing gas enters the flowmeter through the gas inlet pipe orifice 11 of the shell 1, the gas enters the metering cavity 13 of the metering box 3 and is discharged from the gas outlet pipe orifice 12, the gas is blocked by the mechanism in the shell 1 in the flowing process, the internal gas can generate pressure difference at two ends of the gas inlet pipe orifice 11 and the gas outlet pipe orifice 12 of the shell 1, the telescopic volume cavity 3 of the metering cavity 13 is pushed to move in the metering cavity 13 through the pressure difference, and the connecting rod mechanism 4 is driven to coordinate and distribute the gas, so that the motion of the telescopic volume cavity 3 can be continuously and repeatedly carried out, the flowmeter converts the linear reciprocating motion into the circular motion of the hinge frame 5 through the internal connecting rod mechanism 4, and then drives the magnetic steel 7 to rotate through the circular motion of the hinge frame 5; the magnetic steel 6 induced by the magnetic coding chip 8 rotates, the magnetic coding chip 8 converts the analog signal of the rotation of the magnetic steel 7 into a digital number, and the digital number is displayed on the display panel 10 through the analysis and calculation of the microprocessor of the control circuit board 9.
The magnetic coding chip 8 adopts the volumetric metering principle, and divides the volumetric measurement into n Vi (flowmeter circulating volume) and n Vsi by using the magnetic coding chip, so that
Setting ki as Ni/Vi coefficients in the measurement range of Q flow, and the segmented calibration ki value comprises the following steps:
wherein Q is the gas flow rate; vi is the flowmeter circulation volume; vsi is the accumulated flow after temperature and pressure correction, qi is the instantaneous flow, dt is the time, Ni is the number of pulses, ki is the linear coefficient, and ti is the time; and obtaining a linear regression equation correction detection error curve by using a least square method, and giving errors in a segmented manner.
For example, each rotation of the magnetic steel 7 represents 1.2L of volume, a rotation signal is sensed to the magnetic encoding chip 8, the magnetic encoding chip divides 1.2L into 1024 numbers (the magnetic encoding is 1024 pulses per rotation), each number is about 0.001L, then the microprocessor of the control circuit board 9 utilizes the formula (1) to complete the technical index calculation, and finally the display panel 10 displays the instantaneous flow and the accumulated flow.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (8)
1. The utility model provides a low flow gas flowmeter of high accuracy which characterized in that: comprises a shell (1), a measuring box (2), a telescopic volume cavity (3), a connecting rod mechanism (4), a rotating shaft (6), magnetic steel (7), a magnetic coding chip (8), a control circuit board (9) and a display panel (10), wherein the measuring box (2) is arranged in the shell (1), measuring cavities (13) are arranged at the front side and the rear side of the measuring box (2), the telescopic volume cavity (3) is arranged in the measuring cavities (13), an air inlet pipe orifice (11) and an air outlet pipe orifice (12) are arranged at the upper part of the shell (1), the air inlet pipe orifice (11) is communicated with the shell (1), the air outlet pipe orifice (12) is communicated with the measuring cavities (13), one end of the connecting rod mechanism (4) is connected with the telescopic volume cavity (3), a hinge frame (5) is connected between the two connecting rod mechanisms (4), one end of the rotating shaft (6) is connected at the middle position of the hinge frame (5), the other end of the rotating shaft (6) is connected with a magnetic steel (7), and the magnetic coding chip (8) is arranged on the inner wall of the shell (1) and corresponds to the magnetic steel (7); the control circuit board (9) is arranged in the shell (1), and the display panel (10) is installed on the outer end face of the shell (1).
2. A high accuracy low flow gas meter as defined in claim 1 wherein: the magnetic coding chip (8) and the display panel (10) are both connected with the control circuit board (9).
3. A high accuracy low flow gas meter as defined in claim 1 wherein: and a pressure sensor (15) and a temperature sensor (14) are arranged at the inner lower part of the air outlet pipe orifice (12), and the pressure sensor (15) and the temperature sensor (14) are electrically connected to the control circuit board (9).
4. A high accuracy low flow gas meter as defined in claim 1 wherein: the control circuit board (9) is connected with a communication module (16) and is arranged on the outer wall of the shell (1).
5. A high accuracy low flow gas meter as defined in claim 4 wherein: the communication module (16) is wirelessly connected with the mobile equipment terminal (17).
6. A high accuracy low flow gas meter as defined in claim 5 wherein: the communication module (16) is a WiFi module or a Bluetooth module, and the mobile equipment terminal (17) is a mobile phone or a tablet computer.
7. A high accuracy low flow gas meter as defined in claim 1 wherein: the connecting rod mechanism (4) comprises a telescopic volume cavity deflector rod (401), a rotating rod (402), a first connecting rod (403), a second connecting rod (404), a third connecting rod (405), a fourth connecting rod (406) and a sliding block (407), one end of the telescopic volume cavity deflector rod (401) is fixed to the telescopic volume cavity (3), the other end of the rotating rod (402) is fixed to the first connecting rod (403), the first connecting rod (403) is fixed to the second connecting rod (404), and the second connecting rod (404) is hinged to the third connecting rod (405) and the fourth connecting rod (406) respectively.
8. A high accuracy low flow gas meter as defined in claim 7 wherein: the third connecting rod (405) is hinged to the hinge frame (5), and the fourth connecting rod (406) is connected to the sliding block (407).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120902880.7U CN214538085U (en) | 2021-04-28 | 2021-04-28 | High-precision low-flow gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120902880.7U CN214538085U (en) | 2021-04-28 | 2021-04-28 | High-precision low-flow gas flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN214538085U true CN214538085U (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120902880.7U Active CN214538085U (en) | 2021-04-28 | 2021-04-28 | High-precision low-flow gas flowmeter |
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| CN (1) | CN214538085U (en) |
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- 2021-04-28 CN CN202120902880.7U patent/CN214538085U/en active Active
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