CN213749512U - Measuring device of special ventilation rate standard rod of tobacco - Google Patents
Measuring device of special ventilation rate standard rod of tobacco Download PDFInfo
- Publication number
- CN213749512U CN213749512U CN202022534431.XU CN202022534431U CN213749512U CN 213749512 U CN213749512 U CN 213749512U CN 202022534431 U CN202022534431 U CN 202022534431U CN 213749512 U CN213749512 U CN 213749512U
- Authority
- CN
- China
- Prior art keywords
- ventilation rate
- standard rod
- flow
- rate standard
- tobacco
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a measuring device of special ventilation rate standard rod of tobacco which characterized in that: the measuring device is characterized in that a gas pressure adjusting device, a negative pressure generator, a piston pump driven by a stepping motor, a digital differential pressure meter, a digital flowmeter, a special clamp and the like are connected into a measuring gas path, so that the real-time control of the total gas flow Q and the ventilation flow Q are realizedTAccurate measurement of. Measuring the actual ambient atmospheric pressure value by using an atmospheric pressure gauge while measuringp. The ventilation rate of the standard rod is measured by using the device, so that the working state of the standard rod with the special ventilation rate for tobacco can be kept consistent with the actual working condition, the method is simple to operate, and the measuring speed is high; and the flow is measured by adopting a soap film flowmeter according to JJG (tobacco) 17-2002 verification regulationCompared with the method for controlling the total flow Q through the constant flow hole, the method can avoid the test air from being soaked by the soap liquid, control the flow of the total flow Q in real time, obtain more objective and accurate results, and reduce the reading error of the soap film flowmeter and the interference of the objective environment.
Description
Technical Field
The utility model belongs to tobacco measurement standard utensil examination field, concretely relates to measuring device of special ventilation rate standard rod of tobacco and utilize it to carry out measuring method.
Background
The ventilation rate of the cigarette is one of key technical indexes in the physicochemical indexes of the cigarette product, the ventilation rate effect of the cigarette product can influence the smoking feeling of consumers, and meanwhile, the filter tip ventilation technology is one of the more common tar reduction means applied internationally at present. The special tobacco ventilation rate standard rod is a standard component for calibrating the cigarette ventilation rate detection equipment, and the accurate measurement of the special tobacco ventilation rate standard rod is the basis for ensuring the accuracy of the cigarette ventilation rate measurement result. The conventional ventilation flow measuring device and method are shown in fig. 1: the gas pressure adjusting device 1 ', the negative pressure generator 2 ', the constant flow hole (CFO) 3 ', the soap film flowmeter 6 ', the special fixture 4 ' and the ventilation rate standard rod 5 ' are connected to form a measuring gas circuit, the ventilation rate standard rod 5 ' is placed in the special fixture 4 ', the gas outlet 4a ' of the special fixture 4 ' is connected with the CFO, and the side gas inlet 4b ' is connected with the soap film flowmeter. The total air flow measuring method is that when the ventilation rate standard rod 5 ' is not connected, the soap film flowmeter 6 ' is connected with the constant flow hole 3 ' to complete the measurement of the total air flow, and then the ventilation flow is measured according to the connection method shown in the figure 1. With the continuous and deep related research in recent years, it is found that there are some places to be improved for the original measuring method: 1. the soap film flowmeter is adopted for measuring the flow, so that the humidity of the test air is changed by the soap liquid and is inconsistent with the actual working state of the ventilation rate standard rod; 2. the test air humidity is increased, the long-term use can influence the working state of a constant Flow Orifice (CFO for short), the service life of the CFO is shortened, and the Flow of the CFO is influenced; 3. the CFO is adopted to control the total gas flow Q, once the CFO is manufactured, the flow cannot be adjusted and changed, and the accurate control of the 17.5mL/s flow is difficult to realize; 4. the original method needs to measure the total air flow and the ventilation flow respectively to calculate the value of the ventilation rate, and the efficiency is low; 5. the soap film flowmeter is used for measuring the flow, the time spent by soap bubbles needs to be counted manually, and the error is large. Therefore, the measuring method of the special ventilation rate standard rod for the tobacco is improved, the measuring accuracy of the ventilation rate standard rod is improved, and support is provided for quality guarantee of the tobacco industry.
Disclosure of Invention
The utility model aims at providing a measuring device of special ventilation rate standard rod of modified tobacco based on the problem that exists among the above-mentioned prior art exactly, its structural biggest characteristics have given up the use of constant current hole and soap film flowmeter.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a measuring device of special ventilation rate standard rod of tobacco, including gas pressure adjusting device, negative pressure generator, the vacuum gauge, step motor driven piston pump, special fixture, the ventilation rate standard rod connects gradually and constitutes and measure the gas circuit, the last gas outlet that is provided with of special fixture, pressure difference detection mouth, side air inlet and standard rod plug-in hole, the side air inlet is connected with digital flowmeter and is series connection with the ventilation rate standard rod, pressure difference detection mouth is connected with digital pressure difference meter and is parallel connection with the ventilation rate standard rod, the gas outlet communicates with the piston pump.
The utility model discloses in, gas pressure adjusting device can adjust compressed air pressure and be greater than 600 kPa.
The piston pump driven by the stepping motor can realize real-time accurate control of total gas flow Q =17.5mL/s, and ensures that the total gas flow is always stabilized within the range of 17.5 +/-0.1 mL/s.
The digital differential pressure gauge is used for monitoring the differential pressure at two ends of the ventilation rate standard rod in real timep D And (4) changing.
The digital flowmeter is a dry air flowmeter, and the accuracy is better than 0.5 grade.
The special fixture is used for the special ventilation rate standard rod of the fixed tobacco of centre gripping, adopts the special inhaling of tobacco that chinese patent CN202421004U announced to hinder and the calibration of ventilation rate standard component is regarded as with clamping device the utility model discloses a special fixture, main airflow channel in this patent is promptly the utility model provides a fixture venthole-1, inhale and hinder the measuring aperture promptly the utility model provides a pressure differential detection mouth-2, the ventilation rate measuring port is promptly the utility model provides a side inlet port-3.
Utilize the utility model discloses a measuring device measures the special ventilation rate standard rod of tobacco, can realize total gas flow Q's real time control and ventilation flow QTThe measuring method specifically comprises the following steps:
1) detecting a measuring gas path to ensure that the whole gas path connection has no leakage;
2) under the condition that the gas circuit is connected, a vacuum meter is adopted to check whether the negative pressure is greater than 600 kPa;
3) loading a standard rod with special ventilation rate for tobacco, placing the standard rod with special ventilation rate for tobacco in a special fixture, so that one end of the standard rod is communicated with the outside atmosphere, the other end of the standard rod is connected with an air outlet of the special fixture, and a side hole of the standard rod is connected with an air inlet of the side of the special fixture;
4) total gas flow regulation
Opening an air source switch, adjusting a stepping motor to drive a piston pump to do reciprocating motion, adjusting parameters of the stepping motor to enable the flow of the piston pump to meet the requirement that the total air flow Q is 17.5 +/-0.1 mL/s, feeding back to the stepping motor in real time, and controlling the total air flow Q to be stabilized within the range of 17.5 +/-0.1 mL/s all the time;
5) differential pressure and ventilation flow QTMeasurement of
Method for measuring pressure difference value at two ends of ventilation rate standard rod special for tobacco by adopting digital differential pressure gaugep D The digital differential pressure meter is connected with the ventilation rate standard rod in parallel, one end of the digital differential pressure meter is connected with the outside atmosphere, and the other end of the digital differential pressure meter is connected with a differential pressure detection port of the special clamp; method for measuring ventilation rate standard rod special for tobacco through digital flowmeterTThe digital flowmeter is connected with the ventilation rate standard rod in series, one end of the digital flowmeter is connected with the outside atmosphere, and the other end of the digital flowmeter is connected with the air inlet on the side surface of the special fixture;
6) atmospheric pressurepMeasurement of
Measuring real-time ambient barometric pressure values using an atmospheric pressure gaugeP；
7) Calculation of ventilation Rate
The ventilation flow is the flow value Q measured by the digital flowmeterTThe size of the ventilation flow rate is closely related to the pressure at the outlet end of the ventilation rate standard rod; when the ventilation rate standard rod is inserted into the ventilation rate measuring device, the pressure drop effect can cause the pressure change at the outlet end of the ventilation rate standard rod, so that the ventilation flow needs to be corrected, and the correction method is as follows:
the total gas flow Q is constant at 17.5 mL/s;
rate of ventilation
（2）
In the formula: qTFor the flow rate value measured by the digital flow meter,Pis the value of the atmospheric pressure of the environment,P D the change of the pressure difference at two ends of the ventilation rate standard rod is monitored by a numerical value differential pressure meter; qT' is a universal flow correction value.
The utility model discloses compare prior art's beneficial effect: the method for measuring by using the device can keep the measuring working state of the ventilation rate standard rod consistent with the actual working condition, and simultaneously can accurately control the total gas flow Q in real time. Compared with a method for measuring the flow by adopting a soap film flowmeter and controlling the flow of the total gas flow Q by a constant flow hole in JJJG (tobacco) 17-2002 verification regulations, the method can avoid the test air from being soaked by the soap liquid, controls the flow of the total gas flow Q in real time by a piston pump, has more objective and accurate results, and reduces the reading error of the soap film flowmeter and the interference of an objective environment.
Drawings
FIG. 1 is a schematic diagram of a prior art measurement apparatus and method,
in fig. 1: 1' is a gas pressure regulating device; 2' is a negative pressure generator; 3' is Constant Flow Orifice (CFO); 4 ' is a special clamp, 4a ' is an air outlet, and 4b ' is a side air inlet; 5' is a ventilation rate standard rod; and 6' is a soap film flowmeter.
FIG. 2 is a schematic view of the measuring device and method of the present invention,
in fig. 2: 1 is a gas pressure regulating device; 2 is a negative pressure generator; 3 is a piston pump driven by a stepping motor; 4 is a special clamp; 5 is a ventilation rate standard rod, 4a is an air outlet, 4b is a side air inlet, and 4c is a pressure difference detection port; 6 is a digital flowmeter; 7 is a vacuum meter; and 8 is a digital differential pressure gauge.
FIG. 3 is a comparative laboratory chart.
Detailed Description
The utility model discloses the following further detailed description of taking together drawings, embodiment:
first, equipment constitution and connection
As shown in fig. 2: the utility model discloses a measuring device of special ventilation rate standard rod of tobacco, including gas pressureAdjusting device 1, negative pressure generator 2, vacuum meter 7, step motor driven piston pump 3, special fixture 4, ventilation rate standard rod 5 connect gradually and constitute and measure the gas circuit, be provided with gas outlet 4a on the special fixture 4, pressure differential detection mouth 4c, side air inlet 4b and standard rod plug-in hole, side air inlet 4b is connected with digital flowmeter 6 and is series connection with ventilation rate standard rod 5, pressure differential detection mouth 4c is connected with digital differential pressure gauge 8 and is parallel connection with ventilation rate standard rod 5, gas outlet 4a communicates with piston pump 3, finally realize total air flow Q's real time control and ventilation flow QTAccurate measurement of.
Special fixture is used for the special ventilation rate standard rod of the fixed tobacco of centre gripping, adopts the special tobacco of chinese patent CN202421004U to inhale and hinders and the calibration of ventilation rate standard component is with clamping device as the utility model discloses a special fixture, main airflow channel in this patent is promptly the utility model provides a fixture venthole 4a, inhale and hinder the measuring aperture promptly the utility model provides a pressure differential detection mouth 4c, the ventilation rate measuring port is promptly the utility model provides a side air inlet 4 b.
Step two, measuring method
1. Gas circuit connection
The above-mentioned instruments and equipment are connected as shown in fig. 2, and the whole gas circuit connection is ensured to be used after no leakage.
2. Negative pressure inspection
In the case of the gas circuit being switched on, the vacuum gauge 7 is used to check whether the negative pressure is greater than 600 kPa.
3. Special ventilation rate standard rod for tobacco filling
The special tobacco ventilation rate standard rod 5 is placed in the special fixture 4, one end of the standard rod is communicated with the outside atmosphere, the other end of the standard rod is connected with the special fixture air outlet 4a, and the side hole of the standard rod is connected with the special fixture side air inlet 4 b.
4. Total gas flow regulation
And opening an air source switch, adjusting the stepping motor to drive the piston pump 3 to do reciprocating motion, adjusting parameters of the stepping motor to enable the flow of the piston pump to meet the requirement of total gas flow Q (17.5 +/-0.1) mL/s, feeding back the total gas flow Q to the stepping motor in real time, and controlling the total gas flow Q to be always stabilized within the range of (17.5 +/-0.1) mL/s.
5. Differential pressure and ventilation flow QTMeasurement of
The digital differential pressure gauge 8 is adopted to measure the differential pressure value at two ends of the standard rod 5 with the special ventilation rate for the tobaccop D The digital differential pressure meter 8 is connected with the ventilation rate standard rod 5 in parallel, one end of the digital differential pressure meter is connected with the outside atmosphere, and the other end of the digital differential pressure meter is connected with a differential pressure detection port 4c of the special clamp 4; measuring the ventilation flow Q of the special ventilation rate standard rod 5 for tobacco through a digital flowmeter 6TThe digital flowmeter 6 is connected in series with the ventilation rate standard rod 5, one end of the digital flowmeter is connected with the outside atmosphere, and the other end of the digital flowmeter is connected with the side air inlet 4b of the special fixture 4.
5. Atmospheric pressurepMeasurement of
Measuring real-time ambient barometric pressure values using an atmospheric pressure gaugep。
6. Calculation of ventilation Rate
Rate of ventilation
And calculating the result of the ventilation rate standard rod through the two formulas.
The following is described in further detail with reference to examples:
measuring results and accuracy analysis of ventilation rate standard bars with three values of 20%, 50% and 80% respectively
1. The ventilation rate standard bar was allowed to equilibrate for 24 hours in an environment at a temperature of (22. + -. 2) ℃ and a relative humidity of (60. + -. 5)% RH.
2. Parameters of the stepper motor piston pump were adjusted to stabilize the total gas flow at 17.5 mL/s.
3. The measurement process of the ventilation flow rate comprises the following steps: reading the indication value of the digital flowmeter to serve as the ventilation flow value of the ventilation rate standard rod, reading the indication value of the digital differential pressure meter to serve as the pressure difference value of the ventilation rate standard rod, measuring each standard rod for 5 times, and taking the average value of the 5 measured values as a final value.
4. The ventilation rate values of the standard bars were calculated according to the relation (2), and the results of the ventilation rates of the three standard bars were 18.7%, 50.7% and 77.4%, respectively.
5. Analysis of the accuracy of the ventilation rate values: the results of the ventilation rates of the three standard rods are compared with the ventilation rate values measured in three laboratories internationally, as shown in fig. 3, the absolute value of the deviation between the measured values and the average value of the four laboratories is 0.57% at most, and the practical application requirements are met.
Claims (5)
1. The utility model provides a measuring device of special ventilation rate standard rod of tobacco which characterized in that: the device comprises a gas pressure adjusting device, a negative pressure generator, a vacuum meter, a stepping motor driven piston pump, a special fixture and a ventilation rate standard rod which are sequentially connected to form a measuring gas circuit, wherein a gas outlet, a differential pressure detection port, a side gas inlet and a standard rod insertion hole are formed in the special fixture, the side gas inlet is connected with a digital flowmeter and is connected with the ventilation rate standard rod in series, the differential pressure detection port is connected with the digital differential pressure meter and is connected with the ventilation rate standard rod in parallel, and the gas outlet is communicated with the piston pump.
2. The tobacco specific ventilation rate standard rod measuring device of claim 1, wherein: the gas pressure adjusting device can adjust the pressure of compressed air to be larger than 600kPa, and the normal work of the negative pressure generator is ensured.
3. The tobacco specific ventilation rate standard rod measuring device of claim 1, wherein: the piston pump driven by the stepping motor can realize real-time accurate control of total gas flow Q =17.5mL/s, and ensures that the total gas flow is always stabilized within the range of 17.5 +/-0.1 mL/s.
4. The tobacco specific ventilation rate standard rod measuring device of claim 1, wherein: the digital differential pressure gauge is used for monitoring the differential pressure at two ends of the ventilation rate standard rod in real timep D And (4) changing.
5. The tobacco specific ventilation rate standard rod measuring device of claim 1, wherein: the digital flowmeter is a dry air flowmeter, and the accuracy is better than 0.5 grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022534431.XU CN213749512U (en) | 2020-11-05 | 2020-11-05 | Measuring device of special ventilation rate standard rod of tobacco |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022534431.XU CN213749512U (en) | 2020-11-05 | 2020-11-05 | Measuring device of special ventilation rate standard rod of tobacco |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213749512U true CN213749512U (en) | 2021-07-20 |
Family
ID=76820568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022534431.XU Active CN213749512U (en) | 2020-11-05 | 2020-11-05 | Measuring device of special ventilation rate standard rod of tobacco |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213749512U (en) |
-
2020
- 2020-11-05 CN CN202022534431.XU patent/CN213749512U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104225745B (en) | Calibration device of breathing machine tester | |
| CN101310788A (en) | Anesthesia apparatus and calibration method of suction valve thereof | |
| CN112229455B (en) | Suction resistance standard rod measuring method capable of adjusting volume flow | |
| CN111307655A (en) | Cigarette resistance temperature compensation measuring method | |
| CN111189742A (en) | Cigarette suction resistance measuring device | |
| CN109238936B (en) | Compensation type ventilation rate standard rod calibration device and calibration method thereof | |
| CN213749512U (en) | Measuring device of special ventilation rate standard rod of tobacco | |
| CN102243160B (en) | Method for detecting suction resistance of cigar | |
| CN220437536U (en) | Ventilation rate calibration device suitable for unmanned | |
| CN112827034B (en) | Calibration system and method for air suction valve of pneumatic electric control anesthesia machine | |
| CN112369654B (en) | Differential pressure compensation elimination method of cigarette ventilation rate detection device | |
| CN109939315A (en) | A kind of automatic height above sea level compensation method of ventilator turbine pressure control | |
| CN110044798A (en) | Check device and check method during an a kind of step and compensation ventilation rate master bar | |
| CN112229465A (en) | Suction resistance standard rod measuring system capable of adjusting volume flow | |
| CN205426298U (en) | Automatic school frock of marking of turbine anesthesia machine flow sensor | |
| CN104605856A (en) | Double-cavity volume tracing box | |
| CN214951687U (en) | Flow disc flow measuring device based on mass flow feedback adjustment | |
| CN211086032U (en) | Ventilation rate standard rod checking device | |
| CN104807665B (en) | Humidifying capability testing device for humidifier | |
| CN106706816A (en) | Vacuum sampling device for gas chromatograph | |
| CN105043665B (en) | A kind of pressure detection system and its calibration method with automatic calibration function | |
| CN211784936U (en) | Cigarette suction resistance measuring device | |
| CN108362608B (en) | Cigarette resistance automatic device integrating open resistance and closed resistance measurement | |
| CN113514135A (en) | Flow disc flow measuring device and method based on mass flow feedback adjustment | |
| CN212843757U (en) | Volume flow adjustable suction resistance standard rod measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |