CN212432231U - Standard bar ventilation rate calibrating device - Google Patents
Standard bar ventilation rate calibrating device Download PDFInfo
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- CN212432231U CN212432231U CN202022014381.2U CN202022014381U CN212432231U CN 212432231 U CN212432231 U CN 212432231U CN 202022014381 U CN202022014381 U CN 202022014381U CN 212432231 U CN212432231 U CN 212432231U
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Abstract
The utility model provides a standard stick ventilation rate calibrating device, standard stick ventilation rate calibrating device includes: the detection cavity is a cylinder with a cylindrical cavity which is communicated in the axial direction, and is provided with an air inlet, a suction port, a sealing assembly, a limiting element and a detection air flow channel, wherein the limiting element can move in the radial direction to be inserted into the cylindrical cavity; a detection gas path connected to the detection gas flow path; one end of the flowmeter is connected to the detection gas path; the negative pressure controller is connected to an air pressure modulation interface at the top of the detection cavity; a constant flow suction module connected to the suction port; the differential pressure sensor is connected on a suction gas path between the constant-current suction module and the suction port; and the processing system is respectively connected with the flowmeter, the negative pressure controller and the differential pressure sensor. The calibration device can effectively eliminate the deviation of the detection result caused by the pressure drop generated when the flowmeter works.
Description
Technical Field
The utility model relates to a cigarette detection area, more specifically relates to a device for calibrating standard stick ventilation rate.
Background
The ventilation of the cigarette is a key factor influencing the release amount of tar and CO in the cigarette product, and the ventilation has a great influence on the sensory quality of the cigarette product. Cigarette ventilation refers to the flow of air through the other paper wrappers or associated materials of the cigarette in addition to entering the front end of the unlit cigarette. The ventilation rate is the ratio of the ventilation air flow to the total air flow at the suction end in percentages. The ventilation rate is generally divided into filter tip ventilation rate and cigarette paper ventilation rate according to different detection positions.
The ventilation rate standard rod is a standard component used on a cigarette ventilation rate tester and a cigarette physical property comprehensive test bench, and the measuring performance of the ventilation rate standard rod directly determines the accuracy of the cigarette ventilation rate measurement. In order to ensure the accurate and reliable transmission of the quantity value of the ventilation rate standard rod, the ventilation rate standard rod needs to be calibrated. At present, the tobacco industry generally adopts a soap film flowmeter as a standard to measure the total air flow and the ventilation flow of a ventilation rate standard rod, the method is time-consuming and labor-consuming, and is easy to introduce large human errors, but the soap film flowmeter is widely used due to the fact that the pressure difference formed when the soap film flowmeter is used for measuring the flow is small (the pressure difference is generally less than 10 Pa).
In order to solve the pressure drop influence caused by using other flow testing devices, the chinese patent CN109085111A proposes an active piston type ventilation rate standard rod calibration device and a calibration method thereof, which can improve the calibration accuracy of the standard rod to a certain extent, but the device has a complex structure, is difficult to implement, and does not fundamentally solve the pressure drop problem caused by flow.
Chinese patent CN209014434U discloses a one-step type ventilation rate standard rod period checking device, which uses two flow sensors as standards to complete measurement of the value of the ventilation rate standard rod in one step, but the accuracy requirement for components such as a flowmeter and a differential pressure gauge is high, and the problem of reduction of pressure drop generated by fluid still exists.
Chinese patent CN209014432U proposes a compensation type ventilation rate standard rod calibration device, which adopts a needle valve to compensate the pressure difference caused by a volume type flow sensor, effectively eliminating the test deviation caused by the pressure drop of a flow meter, especially in the calibration of a high ventilation rate standard rod, the test deviation caused by the pressure drop of the flow meter is larger, but the pressure is adjusted to balance through the needle valve and is affected by the downstream pressure drop, the reason is complex, the operation difficulty is larger, the test time and efficiency become the main problems in calibration and test, so that the method is difficult to be widely applied.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a standard stick ventilation rate calibrating device, calibrating device can eliminate effectively because of the flowmeter during operation because the produced pressure drop of gas passage time leads to the testing result deviation, can eliminate the demand to the low suction resistance flowmeter of expensive simultaneously.
According to the utility model discloses, a standard stick ventilation rate calibrating device is provided, include: the detection cavity is a cylinder with a cylindrical cavity which is communicated in the axial direction, and is provided with an air inlet close to the top, a suction port close to the bottom, a sealing assembly for sealing the cylindrical cavity, a limiting element and a detection air flow channel for communicating the cylindrical cavity with the outside, wherein the air inlet is communicated with the atmosphere, the limiting element is inserted into the cylindrical cavity at the lower part of the detection cavity, and the limiting element can move in the radial direction to position a standard rod placed in the cylindrical cavity; the detection gas path is arranged outside the detection cavity and connected to the detection gas flow channel; one end of the flowmeter is connected to the detection gas path, and the other end of the flowmeter is connected to the atmosphere; the negative pressure controller is connected to an air pressure modulation interface, and the air pressure modulation interface is arranged at the top of the detection cavity and is communicated with the columnar cavity; the constant-current suction module is connected to the suction port; the differential pressure sensor is connected on a suction gas path between the constant-current suction module and the suction port; and the processing system is respectively connected with the flowmeter, the negative pressure controller and the differential pressure sensor.
According to an embodiment of the present invention, the seal assembly may include: a first pinch valve disposed at an upper end of the cylindrical cavity; a second pinch valve disposed at a lower end of the cylindrical cavity; and first and second sealing elements disposed around the cylindrical cavity between the first and second pinch valves, wherein during testing, the first sealing element is located at an upper end of the standard rod, the second sealing element is located at a lower end of the standard rod, and each of the first and second sealing elements, when open, abuts a circumferential surface of the standard rod to block airflow therethrough, wherein the stop element is disposed adjacently below the second sealing element.
According to another embodiment, the standard rod may include an inlet end face, an outlet end face, a side end face, a main capillary hole axially penetrating the standard rod in an inside, and a vent capillary hole radially formed on the side end face near the outlet end face and communicating with the main capillary hole. The detection flow path may be provided at a position corresponding to the vent capillary hole.
Alternatively, the constant flow suction module may comprise a suction flow control meter, a vacuum generator, a solenoid valve and a gas source which are sequentially communicated, wherein the suction flow control meter is connected with the suction port.
According to one example, the distance the stop element moves in the radial direction is not less than the radius of the cylindrical cavity.
Drawings
The above and other aspects and features of the present invention will become apparent from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural view of a standard rod draft calibration apparatus according to an embodiment of the present invention;
FIG. 2 is a perspective view of a standard rod used in the standard rod ventilation calibration apparatus of the present invention;
FIG. 3 is an enlarged schematic view of the standard rod shown in FIG. 2, as viewed from the outlet end face; and
fig. 4 is a schematic structural diagram of a constant flow pumping module according to an alternative embodiment of the present invention.
Detailed Description
Illustrative, non-limiting embodiments of the present invention are described in detail below with reference to the accompanying drawings, further illustrating a standard rod ventilation rate calibration apparatus according to the present invention.
According to the utility model discloses a standard stick ventilation rate calibrating device is including detecting cavity 1, detecting gas circuit 2, flowmeter 3, negative pressure controller 4, constant current suction module 5, differential pressure sensor 6 and processing system 7. Referring to fig. 2 and 3, the standard rod 8 includes an inlet end face 80, an outlet end face 81, a side end face 82 formed between the inlet end face and the outlet end face, a manifold capillary hole 83 axially penetrating the standard rod inside, and a vent capillary hole 84 radially formed on the side end face 82 near the outlet end face 81 and communicating with the manifold capillary hole 83. The structure of the calibration device for ventilation rate of the master stick according to the present invention will be described in detail with reference to fig. 1.
The detection chamber 1 is a cylinder having a cylindrical cavity 10 running through in the axial direction, the dimensions of which match those of a standard rod for insertion of the standard rod during detection. In addition, the detection chamber 1 has an air inlet 11 near the top, a suction port 12 near the bottom, a sealing assembly for sealing the cylindrical cavity 10, a position-limiting member 13, and a detection air flow passage 14 for communicating the cylindrical cavity 10 with the outside. Both the intake port 11 and the suction port 12 communicate with the outside, wherein the intake port communicates with the atmosphere. The stop element 13 is inserted in the cylindrical cavity 10 at the lower part of the detection chamber 1 and can move telescopically in a radial direction in order to position a standard rod placed in the cylindrical cavity 10 so that it stands upright in said cylindrical cavity. According to an example, the limiting element can be a needle structure, a column structure or other structures capable of blocking, and the telescopic length of the limiting element is not less than the radius of the column cavity 10. For example, the detection flow path may be provided at a position corresponding to the vent capillary hole 84.
The detection gas path 2 is arranged outside the detection cavity 1 and is connected to the detection gas flow channel 14. One end of the flowmeter 3 is connected to the detection gas path 2, and the other end is connected to the atmosphere, so as to detect the flow rate of the gas flow on the detection gas path. The negative pressure controller 4 is connected to an air pressure modulation interface 15 which is arranged at the top of the detection cavity 1 and is communicated with the columnar cavity 10. The constant-flow suction module 5 is connected to the suction opening 12 by means of, for example, a gas line in order to generate a suction gas flow of constant volume flow. For example, the constant flow pumping module may pump at a constant volume flow of 17.5 mL/s. The differential pressure sensor 6 is connected on the suction air path between the constant flow suction module 5 and the suction port 12. The processing system 7 is respectively connected with the flowmeter 3, the negative pressure controller 4 and the differential pressure sensor 6, so as to control the adjustment of the negative pressure controller 4, receive the differential pressure detected by the differential pressure sensor 6 and the gas flow detected by the flowmeter 3, and process the differential pressure and the gas flow to obtain the calibrated standard rod ventilation rate.
According to the utility model discloses a standard stick ventilation rate calibrating device's detection air current passageway is when the access state during the detection, all can not produce the pressure drop (promptly, the pressure drop is not more than 5Pa) when any flow passes through to the negative pressure value that negative pressure controller produced can carry out quick adjustment in real time according to the flow that the flowmeter detected, changes with the atmospheric pressure in the control detection cavity. Therefore, according to the utility model discloses a proof test result deviation that the proof test device of standard stick ventilation rate can eliminate effectively and lead to because of the flowmeter pressure drop to obtain the accurate proof test result of standard stick ventilation rate after the calibration.
According to an embodiment of the present invention, the sealing assembly may further comprise a first pinch valve 91 provided at an upper end of the cylindrical cavity 10, a second pinch valve 92 provided at a lower end of the cylindrical cavity 10, a first sealing element 93 and a second sealing element 94. The opening and closing of the first pinch valve 91 and the second pinch valve 92 can realize the opening and sealing of the detection cavity. A first sealing element 93 and a second sealing element 94 are arranged around the cylindrical cavity 10 between the first pinch valve 91 and the second pinch valve 92. During testing, the first sealing member 93 is located at the upper end of the standard rod 8, the second sealing member 94 is located at the lower end of the standard rod 8, and each of the first sealing member and the second sealing member, when opened, abuts against the circumferential surface of the standard rod 8 to block the passage of air flow at the corresponding portion. The stop element 13 is disposed adjacently below the second sealing element 94 so as to be able to locate the bottom end of the standard rod when extended to stop it. According to the embodiment, the first sealing member 93 and the second sealing member 94 divide the detection chamber 1 into three regions, an air pressure modulation region, a standard rod ventilation region and a suction region, in this order from top to bottom, as shown in fig. 1.
According to an alternative embodiment, the constant flow pumping module 5 may further comprise a pumping flow control meter 50, a vacuum generator 51, a solenoid valve 52 and a gas source 53 in serial communication, wherein the flow control meter 50 is connected to the pumping port 12, as shown in fig. 4.
Next, a method of calibrating the ventilation rate of the standard stick using the standard stick ventilation rate calibration apparatus will be explained. According to the utility model discloses a calibration method includes:
step A: moving the stop element 13 in a radial direction to a position projecting into the cylindrical cavity 10, opening the first pinch valve 91 and closing the second pinch valve 92, and closing a plurality of sealing elements provided between said first pinch valve and said second pinch valve, so as to keep the cylindrical cavity 10 clear;
and B: inserting the air outlet end face 81 of the standard rod 8 downwards into the columnar cavity 10 to enable the standard rod to be vertically positioned in the columnar cavity 10 under the action of the limiting element 13, and opening the plurality of sealing elements, so that the plurality of sealing elements are attached to corresponding positions of the circumferential surface of the standard rod to enable air flow not to pass through;
and C: closing the first pinch valve 91 to keep the detection chamber 1 sealed;
step D: starting the constant-flow suction module 5 to perform suction at a constant flow rate, for example, suction at a constant volume flow rate of 17.5mL/s, and opening the detection gas flow channel 14, the flow meter 3, the differential pressure sensor 6 and the negative pressure controller 4, so that the negative pressure controller 4 adjusts the gas pressure in the detection cavity 1 in real time, the flow meter 3 records the gas flow rate in the detection gas path 2 in real time, and sends the gas flow rate and the differential pressure detected by the differential pressure sensor to the processing system 7; and
step E: the gas flow and the differential pressure are processed by a processing system 7 to obtain a calibrated standard rod ventilation rate.
When the above steps a to E are completed, the constant-flow suction module 5 stops the suction, and the second pinch valve 92 opens and closes the plurality of sealing members, so that the standard rod falls from the second pinch valve 92. Then, the above steps A to E are repeated for the next detection.
According to an exemplary embodiment, the plurality of sealing members includes a first sealing member 93 and a second sealing member 94, thereby dividing the detection chamber into an air pressure modulation region, a standard rod ventilation region, and a suction region in order from top to bottom. The detection flow path 14 is provided at a position corresponding to the vent capillary hole 84. According to the utility model discloses a step D of calibration method further includes:
d01: starting the constant-current suction module 5 and the negative pressure controller 4, and starting the flowmeter 3 to detect the detection gas circuit 2 in real time; and
d02 regulating the air pressure P in the air pressure regulating area by the negative pressure controller 40Adjusted to the pressure P in the ventilation zone with the standard rod1The change is kept consistent until the air pressure of the air pressure modulation area is equal to or close to the air pressure of the standard rod ventilation area, such as the air pressure P of the air pressure modulation area0Air pressure P of ventilation zone with standard rod1The difference is less than 10Pa, and the flow Q of the detection gas path 2 detected by the flowmeter 3 is recorded at the moment1Air pressure P of the air pressure modulation area01And the pressure difference delta P of the suction gas path detected by the pressure difference sensor 61。
Further, step E may further comprise:
e01: obtaining a functional relation between the pressure difference and the flow according to Boyle's law:
P01*Q1＝(P-△P1)*Q1'; and
e02: obtaining the ventilation rate of the standard rod according to the functional relation through the following calculation formula:
Vs＝Q1’/17.5＝P01*Q1/(P-△P1)/17.5
wherein P is atmospheric pressure, Q1' Standard Bar Ventilation flow, constant flow suction module 5 at 17.5mL/s constant volume flow for suction.
Although exemplary embodiments of the present invention have been described, it will be apparent to those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (5)
1. A master rod ventilation calibration device, the master rod ventilation calibration device comprising:
the detection cavity is a cylinder with a cylindrical cavity which penetrates in the axial direction, and is provided with an air inlet close to the top, a suction port close to the bottom, a sealing assembly for sealing the cylindrical cavity, a limiting element and a detection air flow channel for communicating the cylindrical cavity with the outside, wherein the air inlet is communicated with the atmosphere, the limiting element is inserted into the cylindrical cavity at the lower part of the detection cavity, and the limiting element can move in the radial direction to position a standard rod placed in the cylindrical cavity;
the detection gas path is arranged outside the detection cavity and connected to the detection gas flow channel;
one end of the flow meter is connected to the detection gas path, and the other end of the flow meter is connected to the atmosphere;
the negative pressure controller is connected to an air pressure modulation interface, and the air pressure modulation interface is arranged at the top of the detection cavity and is communicated with the columnar cavity;
a constant flow suction module connected to the suction port;
the differential pressure sensor is connected on a suction gas path between the constant-current suction module and the suction port; and
and the processing system is respectively connected with the flowmeter, the negative pressure controller and the differential pressure sensor.
2. The master rod ventilation rate calibration device of claim 1, wherein the seal assembly comprises:
a first pinch valve disposed at an upper end of the cylindrical cavity;
a second pinch valve disposed at a lower end of the cylindrical cavity; and
a first sealing element and a second sealing element disposed around the cylindrical cavity between the first and second pinch valves, wherein during testing the first sealing element is located at an upper end of the standard rod and the second sealing element is located at a lower end of the standard rod, and each of the first and second sealing elements, when open, abuts a circumferential surface of the standard rod to block airflow therethrough,
wherein the spacing element is disposed adjacently below the second sealing element.
3. The master rod ventilation calibration device of claim 1, wherein:
the standard rod comprises an air inlet end face, an air outlet end face, a side end face, a main capillary hole which penetrates through the standard rod in the axial direction in the inner part, and a ventilation capillary hole which is formed on the side end face close to the air outlet end face in the radial direction and is communicated with the main capillary hole; and
the detection air flow passage is provided at a position corresponding to the vent capillary hole.
4. The master rod ventilation rate calibration device of claim 1, wherein the constant flow suction module comprises a suction flow control meter, a vacuum generator, a solenoid valve and an air source which are sequentially communicated, wherein the suction flow control meter is connected with the suction port.
5. The master rod ventilation rate calibration device of claim 1, wherein the distance the stop element moves in the radial direction is no less than the radius of the cylindrical cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022014381.2U CN212432231U (en) | 2020-09-15 | 2020-09-15 | Standard bar ventilation rate calibrating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022014381.2U CN212432231U (en) | 2020-09-15 | 2020-09-15 | Standard bar ventilation rate calibrating device |
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| CN212432231U true CN212432231U (en) | 2021-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264340A (en) * | 2020-09-15 | 2022-04-01 | 中国烟草总公司郑州烟草研究院 | Standard rod ventilation rate calibration device and standard rod ventilation rate calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264340A (en) * | 2020-09-15 | 2022-04-01 | 中国烟草总公司郑州烟草研究院 | Standard rod ventilation rate calibration device and standard rod ventilation rate calibration method |
| CN114264340B (en) * | 2020-09-15 | 2024-06-28 | 中国烟草总公司郑州烟草研究院 | Standard rod ventilation rate calibration device and standard rod ventilation rate calibration method |
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