Gas purity detection device

Abstract

The invention provides a gas purity detection device which comprises a base, a shell and a controller, a gas storage tank is arranged on the base, an air cylinder is arranged in the shell, a first piston is arranged in the air cylinder, a first electromagnetic valve and a pressure sensor are arranged on the first piston, the first piston is connected with a push plate through a piston rod, and the push plate is connected to the air cylinder through a first electric push rod. A second electromagnetic valve and a third electromagnetic valve are arranged on the side wall of the air cylinder, the second electromagnetic valve is communicated with the air storage tank through a sampling pipe, the third electromagnetic valve is communicated with the steam cylinder through a steam pipe, a fourth electromagnetic valve and an air outlet valve are arranged on the other opposite side wall of the air cylinder, the fourth electromagnetic valve is communicated with a pure air compression cylinder through a pure air pipe, and the air outlet valve is communicated with an air bag through an air outlet pipe. The other end, opposite to the air outlet pipe, of the air bag is connected to the detection cavity through a catheter. The internal pipeline can be purged according to the weight change of the weighing sensor, and the pipeline is kept clean; pure single gas and water vapor are adopted for calibration, the detection precision is kept stable, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a gas purity detection device. Background Art

[0002] Gas applications are ubiquitous in many fields such as industrial production, laboratory research, and medical health. Common gases include oxygen, nitrogen, hydrogen, carbon dioxide, argon, helium, and sulfur hexafluoride. The process of qualitatively or quantitatively analyzing these gases to determine their composition is called gas detection. This detection process usually involves various chemical, physical, or spectral analysis methods. The purity of the gas plays a vital role in these fields, which directly affects the quality of the product, the accuracy of the experimental results, and the safety of medical treatment. In the field of industrial gas applications, the trace content of water has a vital impact on the purity and application effect of the gas. In order to understand the water vapor content in the gas, dew point detection is usually used. The dew point temperature refers to the temperature at which water vapor in the gas begins to condense into dewdrops. Under the condition of constant temperature and pressure, the high or low dew point temperature can reflect the amount of water vapor in the gas. The higher the dew point temperature, the more water vapor there is in the gas; conversely, the lower the dew point temperature, the less water vapor there is in the air.

[0003] In industry, liquefied air is distilled at different temperatures through a distillation tower, and various pure single gases are separated according to the different boiling points of the gas. These pure single gases are stored in different gas tanks. When factories use gas tanks to store pure single gases, the steam content and other trace gases are the main factors affecting the purity of the single gas. In practical applications, the detection of gas purity is mainly to detect the water vapor content, so as to deduce the purity of the single gas to ensure that the purity of the gas used in the factory is within the qualified range.

[0004] In the prior art, when a gas purity detection device detects the gas in a gas tank, it usually uses a variety of detection instruments to detect the gas to determine the purity of a single gas in the gas tank. This detection process involves a variety of instruments and multiple steps, and requires professional technicians to operate. Therefore, the gas purity detection device requires a lot of manpower and material resources for maintenance in daily use, which increases the operating costs of the enterprise. Summary of the invention

[0005] In view of this, the present invention proposes a gas purity detection device, which uses a compressor to draw the gas to be tested in the gas tank into the cylinder, and the controller controls the first electric push rod to push the piston at a certain speed, so that the gas to be tested flows into the air bag at a certain flow rate, so that the capacitor formed between the positive electrode plate and the negative electrode plate is consistent, thereby indirectly detecting the gas purity and avoiding the problem of clogging and decreased accuracy after repeated use of the detection.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A gas purity detection device comprises a base, a shell and a controller, wherein a gas storage tank is arranged on the base, the shell is arranged on the side of the gas storage tank, a cylinder is arranged in the shell, a piston is slidably arranged in the cylinder, a solenoid valve and a pressure sensor are arranged on the piston, a piston rod is connected to the side of the piston, the piston rod passes through the cylinder and is connected to a push plate, a first electric push rod is arranged on the side of the push plate, the telescopic end of the first electric push rod is connected to the side of the cylinder, a solenoid valve 2 and a solenoid valve 3 are arranged on the side wall of the cylinder, the solenoid valve 2 is connected to the gas storage tank through a sampling tube, a compressor is arranged on the sampling tube, the solenoid valve 3 is connected to the steam cylinder through a steam pipe, and the An electromagnetic valve four and an air outlet valve are provided on the other opposite side wall of the cylinder, the electromagnetic valve four is connected to a pure air compression cylinder through a pure air pipe, the air outlet valve is connected to an airbag through the air outlet pipe, the top and bottom of the airbag are respectively connected to electrode plates, a vibration mechanism is provided on the top of the electrode plate, the top of the vibration mechanism and the bottom of the electrode plate are connected to the shell through a second electric push rod, the other end of the airbag opposite to the air outlet pipe is connected to the detection chamber through a catheter, the detection chamber is connected to the outside through an exhaust pipe, the controller is arranged on the top surface of the base and is electrically connected to the electromagnetic valve one, the electromagnetic valve two, the electromagnetic valve three, the electromagnetic valve four, the air outlet valve, the pressure sensor, the first electric push rod, the second electric push rod, the electrode plate and the vibration mechanism.

[0008] Preferably, a rotating shaft is rotatably provided in the gas tank, a stirring blade is provided on the rotating shaft, one end of the rotating shaft is rotatably connected to the bottom of the gas tank, and the other end passes through the gas tank and is driven by a first motor, and the first motor is arranged on the top surface of the gas tank.

[0009] Preferably, a piston 2 is slidably provided in the steam cylinder, the bottom of the piston 2 is connected to the bottom surface of the steam cylinder through a third electric push rod, the steam cylinder is connected to a steam generator through a connecting pipe 1, a one-way valve 1 is provided on the connecting pipe 1, the steam generator and the steam cylinder are arranged on the top surface of the base, and the controller is electrically connected to the steam generator, the one-way valve 1 and the third electric push rod.

[0010] Preferably, a piston three is slidably provided in the pure gas compression cylinder, the bottom of the piston three is connected to the bottom surface of the pure gas compression cylinder through a fourth electric push rod, the pure gas compression cylinder is connected to a pure gas tank through a connecting pipe two, a one-way valve two is provided on the connecting pipe two, and the controller is electrically connected to the one-way valve one and the fourth electric push rod.

[0011] Preferably, it also includes a filter bag and a weighing device, wherein the filter bag is arranged on the top of the weighing device, and the weighing device is arranged on the bottom of the detection cavity.

[0012] Preferably, the pressure sensor is embedded in piston one and simultaneously monitors the gas pressure on both sides of piston one.

[0013] Preferably, the vibration mechanism includes a fixed plate, a T-shaped slider, a driven plate, a return spring, an eccentric cam and a second motor, the top surface of the fixed plate is connected to the telescopic end of the fourth electric push rod, a T-shaped groove is provided at the bottom of the fixed plate, the T-shaped slider is provided on the top surface of the electrode plate and slides in the T-shaped groove, a through hole is provided on the top of the fixed plate, the through hole is connected to the groove, the driven plate is provided on the top surface of the T-shaped slider and is located in the through hole, the second motor is provided on the top surface of the fixed plate, and its output shaft is provided with an eccentric cam, and the eccentric cam abuts against the side of the driven plate.

[0014] Preferably, it further comprises a support frame, which is arranged on the top surface of the base and the top surface of the support frame is supported by the bottom surface of the shell.

[0015] Preferably, it also includes support legs, which are arranged at the bottom of the base.

[0016] A calibration method for a gas purity detection device comprises the following steps:

[0017] Step S1: Piston 1 introduces pure single gas into the airbag at a preset flow rate, measures the capacitance value A and stores it in the controller;

[0018] Step S2: Piston 1 introduces steam into the airbag under the same flow condition, and the capacitance value B is measured and stored in the controller;

[0019] Step S3: Mix the pure single gas and steam in different proportions from small to large, and introduce each proportion combination into the air bag at a fixed flow rate. After each introduction, measure and record the corresponding capacitance value, so as to obtain multiple capacitance values;

[0020] Step S4: Using a controller, fit the pure single gas capacitance value A obtained in step S1, the steam capacitance value B obtained in step S2, and the capacitance values ​​at multiple mixed gas ratios obtained in step S3 with their respective corresponding gas purities (i.e., the ratio of pure single gas to steam), generate a curve function describing the relationship between capacitance value and gas purity, and store the function in the controller for subsequent detection.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The gas purity detection device can automatically detect the purity of the gas in the gas tank. In the process of detecting the purity of the gas to be tested in the gas tank, the internal pipeline is automatically purged according to the weight increase speed detected by the weighing sensor to clean the solid dust and condensed water in it, so as to keep the internal pipeline of the detection device clean. No manual intervention is required, which reduces the maintenance workload of professional technicians;

[0023] 2. It can automatically complete the calibration operation and the purging of the detection pipeline, thus replacing the manual purging operation by professional technicians, which not only improves work efficiency but also significantly reduces human errors and safety risks;

[0024] 3. A vibration mechanism is provided to vibrate and excite the airbag. When the detection device is purging the pipeline, the controller starts the second motor. The rotation of the second motor drives the eccentric cam to rotate. The rotation of the eccentric cam drives the driven plate to reciprocate in the through hole. The driven plate drives the T-shaped slider to reciprocate in the T-shaped slide groove. The movement of the T-shaped slider drives the electrode plate to move, thereby vibrating and exciting the airbag, which is beneficial to remove fixed particles attached to the airbag, improve the purging effect, and keep the internal pipeline of the detection device clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a schematic diagram of the cross-sectional structure of a gas purity detection device of the present invention;

[0027] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0028] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0029] Figure 4 for Figure 3 Enlarged view of the middle CC;

[0030] Figure numerals: 1, gas storage tank; 2, first motor; 3, rotating shaft; 4, stirring blade; 5, base; 6, supporting leg; 7, sampling tube; 8, electromagnetic valve 1; 9, push plate; 10, first electric push rod; 11, piston rod; 12, piston 1; 13, electromagnetic valve 2; 14, cylinder; 15, air outlet pipe; 16, air outlet valve; 17, pure air pipe; 18, electromagnetic valve 3; 19, pressure sensor; 20, controller; 21, steam pipe; 22, electromagnetic valve 4; 23, shell; 24, air bag; 25, catheter; 26, second electric push rod; 27, electrode plate; 28, solid Fixed plate; 29, driven plate; 30, return spring; 31, eccentric cam; 32, second motor; 33, filter bag; 34, weighing sensor; 35, exhaust pipe; 36, partition; 37, T-shaped slider; 38, T-shaped slide groove; 39, through hole; 40, steam generator; 41, connecting pipe one; 42, one-way valve one; 43, steam cylinder; 44, piston two; 45, third electric push rod; 46, pure gas tank; 47, connecting pipe two; 48, one-way valve two; 49, pure gas compression cylinder; 50, fourth electric push rod; 51, piston three; 52, compressor; 53, support frame. DETAILED DESCRIPTION

[0031] In order to better understand the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0032] See also Figures 1 to 4A gas purity detection device provided by the present invention comprises a base 5, a shell 23 and a controller 20, wherein a gas storage tank 1 is arranged on the base 5, the shell 23 is arranged on the side of the gas storage tank 1, a cylinder 14 is arranged in the shell 23, a piston 12 is slidably arranged in the cylinder 14, a solenoid valve 18 and a pressure sensor 19 are arranged on the piston 12, a piston rod 11 is connected to the side of the piston 12, the piston rod 11 passes through the cylinder 14 and is connected to a push plate 9, a first electric push rod 10 is arranged on the side of the push plate 9, the telescopic end of the first electric push rod 10 is connected to the side of the cylinder 14, a solenoid valve 2 13 and a solenoid valve 3 18 are arranged on the side wall of the cylinder 14, the solenoid valve 2 13 is connected to the gas storage tank 1 through a sampling tube 7, a compressor 52 is arranged on the sampling tube 7, and the solenoid valve 3 18 is connected to the steam cylinder 43 through a steam pipe 21 , an electromagnetic valve four 22 and an air outlet valve 16 are provided on the other opposite side wall of the cylinder 14, the electromagnetic valve four 22 is connected to the pure air compression cylinder 49 through the pure air pipe 17, the air outlet valve 16 is connected to the air bag 24 through the air outlet pipe 15, the top and bottom of the air bag 24 are respectively connected to the electrode plate 27, the top of the electrode plate 27 is provided with a vibration mechanism, the top of the vibration mechanism and the bottom of the electrode plate 27 are connected to the shell 23 through the second electric push rod 26, the other end of the air bag 24 relative to the air outlet pipe 15 is connected to the detection chamber through a conduit 25, and the detection chamber is connected to the outside through the exhaust pipe 35, the controller 20 is arranged on the top surface of the base 5 and is electrically connected to the electromagnetic valve one 8, the electromagnetic valve two 13, the electromagnetic valve three 18, the electromagnetic valve four 22, the air outlet valve 16, the pressure sensor 19, the first electric push rod 10, the second electric push rod 26, the electrode plate 27 and the vibration mechanism.

[0033] When the detection device performs gas purity detection, the detection device is first calibrated. Its function is to establish a mathematical model between gas purity and capacitance value by filling the airbag 24 with gases of different proportions for multiple times. The upper and lower electrode plates 27, the middle airbag 24 and the gas to be tested form a detection capacitor. Different gases to be tested have different dielectric constants and capacitance capacities. Calibration step one: The controller 20 starts the second electric push rod 26. The telescopic end of the second electric push rod 26 drives the electrode plate 27 to move, so that the two electrode plates 27 are close to each other and form a detection capacitor mechanism with the middle airbag 24. Then, the pure single gas is filled into the cylinder 14. After reaching the predetermined pressure, the first electric push rod 10 is started. The first electric push rod 10 drives the piston 12 to fill the pure single gas into the airbag 24 at a certain flow rate. The capacitance value is measured and recorded as A; Calibration step two: Steam is filled into the cylinder 14. After reaching the predetermined pressure, the first electric push rod 10 is started. The first electric push rod 10 drives piston 12, fills steam into the airbag 24 at a certain flow rate, measures and records the obtained capacitance value as B; calibration step three: start the first electric push rod 10, the telescopic end of the first electric push rod 10 drives the push plate 9 to move, the push plate 9 moves to drive the piston rod 11 to move, the piston rod 11 drives the piston 12 to move to the predetermined position of the cylinder 14, at this time, the ratio of the distance between the piston and the two ends of the cylinder 14 is the volume ratio of the gas, at this time, the solenoid valve 8 is in a closed state, and then pure single gas is filled into one side of the cylinder 14, and steam is filled into the other side of the cylinder 14. When the pressure sensor 19 detects the pressure on both sides When the pressure is the same, the electromagnetic valve 2 13 and the electromagnetic valve 4 22 are closed at the same time, and the electromagnetic valve 18 is opened, and the first electric push rod 10 is started to move the piston 12 back and forth for a preset number of times. Gas concentration sensors can also be optionally set on both sides of the piston 12 to detect the concentration of the gas on both sides, and the concentration of the gas in the cavities on both sides is detected in real time when the piston 12 is located at different positions. When the gas concentration in the cavities on both sides of the piston 12 reaches the same, the pure gas and steam are evenly mixed, and then the piston 12 is moved to the side wall and the electromagnetic valve 8 is closed at the same time, and the first electric push rod 10 is started again to drive the active Plug 12, thereby filling the mixed gas into the air bag 24 at a certain flow rate; according to the above operation, the operation is performed from small to large according to the proportion, and the corresponding capacitance value is measured and recorded after each introduction, so as to obtain multiple capacitance values; using the controller 20, the capacitance value A, the capacitance value B, and the capacitance values ​​under the multiple mixed gas ratios obtained in step three are fitted with their respective corresponding gas purities (that is, the ratio of pure single gas to steam), and a curve function describing the relationship between the capacitance value and the gas purity is generated, and the function is stored in the controller 20 for subsequent detection.

[0034] When the detection device performs gas purity detection, the controller 20 first starts the compressor 52 to draw the gas to be tested in the gas storage tank 1 into the cylinder 14. At this time, the piston 12 is located at the leftmost side of the cylinder 14. When the gas to be tested fills the cylinder 14, the pressure sensor 19 detects the gas pressure in real time. When the gas pressure reaches the preset value, the solenoid valve 18 is opened and the solenoid valve 2 13 is closed. Then the first electric push rod 10 is started. The telescopic end of the first electric push rod 10 drives the push plate 9 to move. The movement of the push plate 9 drives the piston rod 11 to move. The piston rod 11 drives the piston 12 to move to the rightmost side, closes the solenoid valve 18 and opens the outlet valve 16. The first electric push rod 10 is started again. The piston 12 fills the gas to be tested in the cylinder 14 into the air bag 24 at a predetermined flow rate through the outlet pipe 15. The capacitance value is measured and used as input. The curve function describing the relationship between the capacitance value and the gas purity is called out by the controller 20 to calculate the corresponding purity value.

[0035] Preferably, a rotating shaft 3 is rotatably provided in the gas tank 1, and a stirring blade 4 is provided on the rotating shaft 3. One end of the rotating shaft 3 is rotatably connected to the bottom of the gas tank 1, and the other end passes through the gas tank 1 and is driven by a first motor 2. The first motor 2 is arranged on the top surface of the gas tank 1.

[0036] When the detection device is working, the first motor 2 is started first. The rotation of the first motor 2 drives the rotating shaft 3 to rotate. The rotation of the rotating shaft 3 drives the stirring blade 4 to rotate. The stirring blade 4 rotates to stir the gas in the gas storage tank 1. The sampling operation is performed after the gas to be tested in the gas storage tank 1 is stirred evenly, which is beneficial to improve the consistency of sampling, reduce sampling errors, and the number of detections, and improve the reliability of the detection results.

[0037] Preferably, a piston 2 44 is slidably provided in the steam cylinder 43, and the bottom of the piston 2 44 is connected to the bottom surface of the steam cylinder 43 through a third electric push rod 45. The steam cylinder 43 is connected to the steam generator 40 through a connecting pipe 1 41, and a one-way valve 1 42 is provided on the connecting pipe 1 41. The steam generator 40 and the steam cylinder 43 are arranged on the top surface of the base 5, and the controller 20 is electrically connected to the steam generator 40, the one-way valve 1 42 and the third electric push rod 45.

[0038] When calibrating the detection mechanism, it is necessary to deliver steam to the cylinder 14 according to the preset volume. The steam generator 40 inputs steam into the steam cylinder 43 through the one-way valve 1 42 and the connecting pipe 1 41. The controller 20 controls the solenoid valve 3 18 to open, and the steam enters the cylinder 14 from the steam cylinder 43 through the steam pipe 21. At this time, the pressure sensor 19 detects the pressure of the steam in real time. When the steam completely enters the cylinder 14 and reaches the preset volume, the steam generator 40 is stopped, and the third electric push rod 45 is started at the same time. The extension of the telescopic end of the third electric push rod 45 drives the piston 2 44 to rise. As the piston 2 44 rises, the steam is compressed. When the pressure sensor 19 detects the preset value, the third electric push rod 45 is stopped and the solenoid valve 3 18 is closed, and the steam delivery operation can be completed.

[0039] Preferably, a piston three 51 is slidably provided in the pure gas compression cylinder 49, and the bottom of the piston three 51 is connected to the bottom surface of the pure gas compression cylinder 49 through a fourth electric push rod 50. The pure gas compression cylinder 49 is connected to the pure gas tank 46 through a connecting pipe two 47. A one-way valve two 48 is provided on the connecting pipe two 47. The controller 20 is electrically connected to the one-way valve one 42 and the fourth electric push rod 50.

[0040] When calibrating the detection mechanism, pure gas needs to be delivered to the cylinder 14 according to the preset volume. The pure gas tank 46 inputs the pure gas into the pure gas compression cylinder 49 through the one-way valve 2 48 and the connecting pipe 2 47. The controller 20 controls the solenoid valve 4 22 to open, and the pure gas enters the cylinder 14 from the pure gas compression cylinder 49 through the pure gas pipe 17. At this time, the pressure sensor 19 detects the pressure of the pure gas in real time. When the pure gas completely enters the cylinder 14 and reaches the predetermined volume, the pure gas tank 46 is stopped, and the fourth electric push rod 50 is started at the same time. The extension of the telescopic end of the fourth electric push rod 50 drives the piston 3 51 to rise. As the piston 3 51 rises, the pure gas is compressed. When the pressure sensor 19 detects the predetermined value, the third electric push rod 45 is stopped and the solenoid valve 4 22 is closed, and the pure gas delivery operation can be completed.

[0041] Preferably, it further comprises a filter bag 33 and a weighing device, wherein the filter bag 33 is arranged on the top of the weighing device, and the weighing device is arranged on the bottom of the detection cavity.

[0042] When the detection mechanism is conducting a gas purity test, the gas enters the filter bag 33 through the conduit 25, and the solid particles and condensed water contained in the gas will fall to the top of the weighing device, and the gas passes through the filter bag 33 and is discharged from the exhaust pipe 35. However, after the weighing device detects that the weight increase rate reaches a preset value, the controller 20 will stop the detection operation and start the purge. First, the steam generator 40 is started to deliver steam to the cylinder 14, and then the cylinder 14 flows out of the outlet pipe 15 at a large flow rate. The high-speed steam quickly passes through the outlet pipe 15, the air bag 24, and the conduit 25 to blow away the solid dust and condensed water therein, thereby keeping the internal pipes of the detection device clean.

[0043] Preferably, the vibration mechanism includes a fixed plate 28, a T-shaped slider 37, a driven plate 29, a reset spring 30, an eccentric cam 31 and a second motor 32, the top surface of the fixed plate 28 is connected to the telescopic end of the fourth electric push rod 50, a T-shaped slide groove 38 is provided at the bottom of the fixed plate 28, the T-shaped slider 37 is provided on the top surface of the electrode plate 27 and is slidably provided in the T-shaped slide groove 38, a through hole 39 is provided on the top of the fixed plate 28, the through hole 39 is connected to the slide groove, the driven plate 29 is provided on the top surface of the T-shaped slider 37 and is located in the through hole 39, the second motor 32 is provided on the top surface of the fixed plate 28, and its output shaft is provided with an eccentric cam 31, and the eccentric cam 31 abuts against the side of the driven plate.

[0044] The vibration mechanism is used to vibrate the airbag 24. When the detection device is performing pipeline purging, the controller 20 starts the second motor 32. The rotation of the second motor 32 drives the eccentric cam 31 to rotate. The rotation of the eccentric cam 31 drives the driven plate 29 to reciprocate in the through hole 39. The driven plate 29 drives the T-shaped slider 37 to reciprocate in the T-shaped slide groove 38. The movement of the T-shaped slider 37 drives the electrode plate 27 to move, thereby vibrating the airbag 24, which is beneficial to remove fixed particles attached to the airbag 24, improve the purging effect, keep the internal pipeline of the detection device clean, improve the detection accuracy, and avoid the error increased by manual purging operation.

[0045] Preferably, a support frame 53 is further included, and the support frame 53 is arranged on the top surface of the base 5, and the top surface of the support frame 53 is supported by the bottom surface of the shell 23.

[0046] The support frame 53 is used to provide additional structural support for the housing 23 to ensure the overall stability of the detection device.

[0047] Preferably, it also includes a supporting leg 6 , which is arranged at the bottom of the base 5 .

[0048] The support legs 6 are located at the bottom of the base 5 and are used to provide stable support to ensure that the detection device can be firmly placed on the ground.

[0049] A calibration method for a gas purity detection device comprises the following steps:

[0050] Step S1: The piston 12 introduces pure single gas into the airbag 24 at a preset flow rate, and the capacitance value A is measured and stored in the controller 20;

[0051] Step S2: The piston 12 introduces steam into the air bag 24 at the same flow rate condition, and the capacitance value B is measured and stored in the controller 20;

[0052] Step S3: Mix the pure single gas and steam in different proportions from small to large, and introduce each proportion combination into the air bag 24 at a fixed flow rate. After each introduction, measure and record the corresponding capacitance value, so as to obtain multiple capacitance values;

[0053] Step S4: Using the controller 20, the pure single gas capacitance value A obtained in step S1, the steam capacitance value B obtained in step S2, and the capacitance values ​​at multiple mixed gas ratios obtained in step S3 are fitted with their corresponding gas purities, that is, according to the ratio of pure single gas to steam, to generate a curve function describing the relationship between capacitance value and gas purity, and store the function in the controller 20 for subsequent detection.

[0054] When the detection device performs purity rack detection on the gas in the gas storage tank 1, the detection device is first calibrated, and the second electric push rod 26 is started. The telescopic end of the second electric push rod 26 drives the electrode plate 27 to move, so that the two electrode plates 27 are close to each other and form a detection capacitor mechanism with the middle air bag 24, and then the pure single gas is filled into the cylinder 14. After reaching the predetermined pressure, the first electric push rod 10 is started. The first electric push rod 10 drives the piston 12 to fill the pure single gas into the air bag 24 at a certain flow rate, and the capacitance value obtained is measured and recorded as A; steam is filled into the cylinder 14. After reaching the predetermined pressure, the first electric push rod 10 is started. The first electric push rod 10 drives the piston 12 to fill the steam into the air bag 24 at a certain flow rate, and the capacitance value obtained is measured and recorded as B; the pure single gas and steam are mixed in different proportions from small to large, and each proportion combination is filled at a fixed flow rate. The gas is introduced into the airbag 24, and the corresponding capacitance value is measured and recorded after each introduction, thereby obtaining multiple capacitance values; using the controller 20, the pure single gas capacitance value A obtained in step S1, the steam capacitance value B obtained in step S2, and the capacitance values ​​under multiple mixed gas ratios obtained in step S3 are fitted with their respective corresponding gas purities, that is, the ratio of pure single gas to steam, to generate a curve function describing the relationship between capacitance value and gas purity, and the function is stored in the controller 20 for subsequent detection; when the purity of the gas in the gas outlet tank is detected, the compression pump is started to introduce the gas into the cylinder 14, and then the gas is filled into the airbag 24 at a preset flow rate, the capacitance value obtained is measured, and the capacitance value is used as input, and the curve function describing the relationship between capacitance value and gas purity is called out by the controller 20 to calculate the corresponding purity value.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas purity detection device, characterized in that: It includes a base, a shell and a controller, wherein a gas storage tank is arranged on the base, the shell is arranged on the side of the gas storage tank, a cylinder is arranged in the shell, a piston 1 is slidably arranged in the cylinder, a solenoid valve 1 and a pressure sensor are arranged on the piston 1, a piston rod is connected to the side of the piston 1, the piston rod passes through the cylinder and is connected to a push plate, a first electric push rod is arranged on the side of the push plate, the telescopic end of the first electric push rod is connected to the side of the cylinder, a solenoid valve 2 and a solenoid valve 3 are arranged on the side wall of the cylinder, the solenoid valve 2 is connected to the gas storage tank through a sampling tube, a compressor is arranged on the sampling tube, the solenoid valve 3 is connected to the steam cylinder through a steam pipe, and a solenoid valve 4 and an outlet are arranged on the other opposite side wall of the cylinder An air valve, wherein the solenoid valve four is connected to a pure air compression cylinder through a pure air pipe, the air outlet valve is connected to an air bag through an air outlet pipe, the top and bottom of the air bag are respectively connected to electrode plates, a vibration mechanism is provided on the top of the electrode plate, the top of the vibration mechanism and the bottom of the electrode plate are connected to the shell through a second electric push rod, a partition is provided in the shell, the partition and the shell enclose a detection cavity, the other end of the air bag relative to the air outlet pipe is connected to the detection cavity through a catheter, the detection cavity is connected to the outside through an exhaust pipe, the controller is arranged on the top surface of the base and is electrically connected to the solenoid valve one, the solenoid valve two, the solenoid valve three, the solenoid valve four, the air outlet valve, the pressure sensor, the first electric push rod, the second electric push rod, the electrode plate and the vibration mechanism.

2. A gas purity detection device according to claim 1, characterized in that: A rotating shaft is rotatably arranged in the gas storage tank, and a stirring blade is arranged on the rotating shaft. One end of the rotating shaft is rotatably connected to the bottom of the gas storage tank, and the other end passes through the gas storage tank and is driven by a first motor, which is arranged on the top surface of the gas storage tank.

3. A gas purity detection device according to claim 1, characterized in that: A piston 2 is slidably provided in the steam cylinder, and the bottom of the piston 2 is connected to the bottom surface of the steam cylinder through a third electric push rod. The steam cylinder is connected to a steam generator through a connecting pipe 1, and a one-way valve 1 is provided on the connecting pipe 1. The steam generator and the steam cylinder are arranged on the top surface of the base, and the controller is electrically connected to the steam generator, the one-way valve 1 and the third electric push rod.

4. A gas purity detection device according to claim 1, characterized in that: A piston three is slidably provided in the pure gas compression cylinder, and the bottom of the piston three is connected to the bottom surface of the pure gas compression cylinder through a fourth electric push rod. The pure gas compression cylinder is connected to a pure gas tank through a connecting pipe two, and a one-way valve two is provided on the connecting pipe two. The controller is electrically connected to the one-way valve one and the fourth electric push rod.

5. A gas purity detection device according to claim 1, characterized in that: It also includes a filter bag and a weighing device, wherein the filter bag is arranged on the top of the weighing device, and the weighing device is arranged on the bottom of the detection cavity.

6. A gas purity detection device according to claim 1, characterized in that: The pressure sensor is embedded in the piston one and monitors the gas pressure at both the front and rear sides of the piston one.

7. A gas purity detection device according to claim 1, characterized in that: The vibration mechanism includes a fixed plate, a T-shaped slider, a driven plate, a return spring, an eccentric cam and a second motor. The top surface of the fixed plate is connected to the telescopic end of the fourth electric push rod. A T-shaped groove is provided at the bottom of the fixed plate. The T-shaped slider is provided on the top surface of the electrode plate and slides in the T-shaped groove. A through hole is provided on the top of the fixed plate, and the through hole is connected to the first groove. The driven plate is provided on the top surface of the T-shaped slider and is located in the through hole. The second motor is provided on the top surface of the fixed plate, and its output shaft is provided with an eccentric cam, and the eccentric cam abuts against the side of the driven plate.

8. A gas purity detection device according to claim 1, characterized in that: It also includes a support frame, which is arranged on the top surface of the base and the top surface of the support frame is supported by the bottom surface of the shell.

9. A gas purity detection device according to claim 1, characterized in that: It also includes support legs, which are arranged at the bottom of the base.

10. A calibration method using the gas purity detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: Piston 1 introduces pure single gas into the airbag at a preset flow rate, measures the capacitance value A and stores it in the controller; Step S2: Piston 1 introduces steam into the airbag under the same flow condition, and the capacitance value B is measured and stored in the controller; Step S3: Mix the pure single gas and steam in different proportions from small to large, and introduce each proportion combination into the air bag at a fixed flow rate. After each introduction, measure and record the corresponding capacitance value, so as to obtain multiple capacitance values; Step S4: Using a controller, fit the pure single gas capacitance value A obtained in step S1, the steam capacitance value B obtained in step S2, and the capacitance values ​​at multiple mixed gas ratios obtained in step S3 with their respective corresponding gas purities (i.e., the ratio of pure single gas to steam), generate a curve function describing the relationship between capacitance value and gas purity, and store the function in the controller for subsequent detection.

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