CN220583487U - Constant flow hole fixture and period checking device - Google Patents
Constant flow hole fixture and period checking device Download PDFInfo
- Publication number
- CN220583487U CN220583487U CN202320977448.3U CN202320977448U CN220583487U CN 220583487 U CN220583487 U CN 220583487U CN 202320977448 U CN202320977448 U CN 202320977448U CN 220583487 U CN220583487 U CN 220583487U
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- constant flow
- base
- flow hole
- flow orifice
- upper cover
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- 238000003825 pressing Methods 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 abstract description 3
- 241000208125 Nicotiana Species 0.000 description 8
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 8
- 230000006872 improvement Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model discloses a constant flow hole clamp and a period checking device, wherein the constant flow hole clamp is used for installing a constant flow hole and comprises a base, an upper pressing ring and an upper cover, wherein a through hole is internally formed in the base, the upper pressing ring is connected with the upper cover, the upper pressing ring is arranged between the end surfaces of the base and the upper cover, an air inlet of the constant flow hole clamp is formed at one end, far away from the upper pressing ring, of the base, and an air outlet of the constant flow hole clamp is formed at one end, far away from the upper pressing ring, of the upper cover; the constant flow hole is arranged in the through holes of the base, the upper pressing ring and the upper cover, a plurality of rubber diaphragms which are used for elastically sealing the constant flow hole are arranged in the base, and the constant flow hole passes through the plurality of rubber diaphragms. The fixture disclosed by the utility model can adapt to the checking and positioning of constant flow holes with various specifications, and can ensure the air tightness of the constant flow holes; the period checking device can realize periodic checking of the constant flow hole, and the quality of the constant flow hole is ensured.
Description
Technical Field
The utility model relates to the technical field of cigarette detection and calibration, in particular to a constant flow hole clamp and a period checking device.
Background
The constant flow hole CFO (Critical Flow Orifice) special for tobacco is a standard instrument used on various special detection instruments for tobacco, such as a suction resistance tester, a ventilation rate tester, a smoking machine suction curve tester and the like, and is mainly used for keeping the gas flow constant to be in accordance with the measurement requirement.
The tobacco industry calibrates the special constant flow rate hole of the tobacco according to JJG (tobacco) 16-2002 'calibration procedure of the special constant flow rate hole of the tobacco', compressed air, a flowmeter, a differential pressure meter and the like are needed in the calibration process, and the calibration period is one year. In actual production, equipment such as a suction resistance tester, a ventilation rate tester and the like is required to be frequently used, a constant flow hole is used as a generator for stabilizing air flow, the situations of tobacco shred pollution, blockage and the like are easy to occur, the stability of the constant flow hole in the period of two calibration at an interval of one year cannot be ensured, but the 'special gas flow standard device for tobacco' has larger occupied area, complex operation and use and cannot be popularized to enterprises. Therefore, it is necessary to check it during regular periods of daily use to ensure that the air flow in the air circuit is stable within the measurement requirements and to determine if the constant flow orifice flow rate has changed.
Moreover, when checking is performed during a regular period, the air tightness of the constant flow orifice cannot be ensured, and the accuracy of the occurrence of the change in the flow of the constant flow orifice is determined.
Disclosure of Invention
The utility model aims to provide a constant flow hole clamp and a period checking device, which are used for solving the problems that in the prior art, the calibration period of a constant flow hole is longer, the stability of the constant flow hole during twice calibration is difficult to ensure, and the air tightness of the constant flow hole during period checking or other checking work is difficult to ensure.
The utility model solves the problems by the following technical proposal:
the constant flow hole clamp is used for installing a constant flow hole and comprises a base, an upper pressing ring and an upper cover, wherein a through hole is formed in the base, the upper pressing ring is connected with the upper cover, the upper pressing ring is arranged between the end faces of the base and the upper cover, an air inlet of the constant flow hole clamp is formed at one end, far away from the upper pressing ring, of the base, and an air outlet of the constant flow hole clamp is formed at one end, far away from the upper pressing ring, of the upper cover; the constant flow hole is arranged in the through holes of the base, the upper pressing ring and the upper cover, a plurality of rubber diaphragms which are used for elastically sealing the constant flow hole are arranged in the base, and the constant flow hole passes through the plurality of rubber diaphragms.
As a further improvement, the base is spliced with the upper cover, and at least one O-shaped sealing ring is arranged between the outer surface of the base and the upper cover.
As a further improvement, the upper pressing ring is in threaded connection with the base, so that a plurality of rubber diaphragms are installed in a pressing mode through the upper pressing ring.
As a further improvement thereof, the constant flow rate hole is disposed perpendicular to the air inlet of the constant flow rate hole holder.
As a further improvement of the present utility model, a constant flow rate hole period checking device is characterized by comprising a negative pressure generator, a mass flowmeter, a differential pressure gauge, a thermometer, an barometer, the constant flow rate hole clamp, the negative pressure generator, the constant flow rate hole clamp and the mass flowmeter are sequentially connected, the constant flow rate hole to be checked is arranged on the constant flow rate hole clamp, negative pressure required for the constant flow rate hole to work is generated through the negative pressure generator, the mass flowmeter measures the upstream mass flow rate of the constant flow rate hole, the differential pressure gauge measures the upstream and downstream differential pressure of the mass flowmeter, the thermometer and the barometer measure the ambient temperature and the barometer to check the flow rate value of the constant flow rate hole.
As a further improvement, a dryer is also arranged between the mass flowmeter and the constant flow rate hole clamp.
As a further improvement, the positive pressure port of the negative pressure generator is connected with compressed air, the negative pressure port of the negative pressure generator is connected with the air outlet of the constant flow hole clamp, and the air outlet of the negative pressure generator is connected with the atmosphere.
As a further improvement thereto, the compressed air is generated by a compressor or a compressed air source.
Compared with the prior art, the utility model has the following advantages:
(1) According to the constant flow hole fixture, the rubber diaphragm is arranged to adapt to checking and positioning of constant flow holes with various specifications, and the O-shaped sealing ring and the rubber diaphragm are arranged to ensure the air tightness of the constant flow holes, so that a guarantee is provided for checking the constant flow holes.
(2) The constant flow hole period checking device can realize periodic checking of the constant flow hole and eliminate the influence caused by the deviation of the constant flow hole in the production process; and through setting up the moisture in the desicator removal atmosphere, prevent that the constant flow hole from damaging because of the entering of moisture, ensured the quality in constant flow hole.
Drawings
FIG. 1 is a view showing the construction of an external appearance of a constant flow orifice fixture according to the present utility model;
FIG. 2 is a cross-sectional perspective view of a constant flow orifice fixture of the present utility model;
FIG. 3 is a schematic cross-sectional view of a constant flow orifice fixture according to the present utility model;
FIG. 4 is a schematic diagram of a rubber diaphragm of a constant flow orifice fixture of the present utility model;
FIG. 5 is a schematic diagram showing the connection of the check device during constant flow orifice according to the present utility model;
FIG. 6 is a graph showing the relationship between the air compressibility factor of the air outlet of the constant flow rate orifice jig and the temperature and absolute pressure in the actual case of the present utility model.
Reference numerals: 1-a base; 2-upper pressing ring; 3-an upper cover; 4-constant flow orifice; 5-a rubber diaphragm; 6-O-shaped sealing ring.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1:
the constant flow orifice has the property that the volume flow remains substantially unchanged under varying inlet end pressures, however, it is affected by the environment of use and the materials, and as the time of use increases, it also generates a certain loss or pollution, resulting in a change in its value. Thus, a constant flow orifice needs to be checked during the period.
Referring to fig. 1-4, a constant flow hole fixture for installing a constant flow hole of a checking device during constant flow hole period comprises a base 1 internally provided with a through hole, an upper pressing ring 2 and an upper cover 3, wherein the constant flow hole 4 is arranged in the through holes of the base, the upper pressing ring and the upper cover, the upper cover is covered with the base, the upper pressing ring is positioned between the upper cover and the base and is respectively propped against the upper cover and the base, and an air inlet of the constant flow hole fixture is formed at one end of the base far away from the upper pressing ring and is used for being connected with a dryer and a mass flowmeter; one end of the upper cover, which is far away from the upper pressing ring, is provided with an air outlet of the constant flow hole clamp and is used for being connected with a negative pressure generator. Preferably, the base and the upper cover can be connected in a pluggable manner, and at least one 0-shaped sealing ring 6 is arranged between the outer side of the base and the upper cover so as to ensure the air tightness of the constant flow hole clamp.
Further, be provided with rubber diaphragm 5 in the through-hole of base, and rubber diaphragm offsets with top clamping ring tip, and top clamping ring passes through threaded connection with the base, presses rubber diaphragm in the base, and the setting of rubber diaphragm is passed to constant flow hole one end tip, carries out elastic seal to constant flow hole one end in the base through the rubber diaphragm, guarantees that the air current flows through from constant flow hole only.
Preferably, the constant flow orifice is disposed perpendicular to the air inlet of the constant flow orifice fixture.
According to the constant flow hole fixture, the rubber diaphragm is arranged to adapt to checking and positioning of constant flow holes with various specifications, and the 0-shaped sealing ring and the rubber diaphragm are arranged to ensure the air tightness of the constant flow holes, so that a guarantee is provided for checking the constant flow holes.
Example 2:
referring to fig. 5, a device for checking the period of a constant flow hole comprises a negative pressure generator, a constant flow hole clamp, a dryer, a mass flowmeter, a differential pressure meter, a thermometer, an barometer and the like, wherein the negative pressure generator, the constant flow hole clamp, the dryer and the mass flowmeter are sequentially connected, the constant flow hole to be checked is arranged on the constant flow hole clamp, negative pressure required by the constant flow hole is generated through the negative pressure generator, the mass flowmeter measures the upstream mass flow of the constant flow hole, the differential pressure meter measures the upstream and downstream differential pressure of the mass flowmeter, the thermometer and the barometer measure the ambient temperature and the barometer, and then the upstream and downstream differential pressure, the ambient temperature and the barometer of the mass flowmeter are converted into the upstream volume flow of the constant flow hole, namely the measurement result of the flow value of the constant flow hole.
Specifically, the positive pressure port of the negative pressure generator is connected with compressed air, the negative pressure port of the negative pressure generator is connected with the air outlet of the constant flow hole clamp so as to provide negative pressure required by normal operation for the constant flow hole, and the air outlet of the negative pressure generator is connected with the atmosphere. The air inlet of the constant flow hole clamp is connected with the air outlet of the dryer, the air inlet of the dryer is connected with the air inlet of the mass flowmeter, and the air inlet of the mass flowmeter is connected with the atmosphere. In this embodiment, the compressed air is generated by a compressor or a compressed air source, and is connected to the positive pressure end of the negative pressure generator to provide an air source for the negative pressure generator. A dryer is connected in series between the air inlet of the constant flow hole clamp and the air outlet of the mass flowmeter, and moisture in the atmosphere is removed through the dryer, so that the constant flow hole to be checked is prevented from being damaged due to the entry of moisture; the differential pressure meter is arranged between the constant flow hole clamp and the dryer and is positioned at the air inlet of the constant flow hole clamp and used for measuring the differential pressure between the air inlet of the constant flow hole and the atmosphere.
The method for measuring the constant flow orifice flow value comprises the following specific steps:
s1, collecting a pressure difference P1 measured by a pressure difference meter, and calculating an absolute pressure P2 of the atmosphere measured by an atmospheric pressure meter to obtain an absolute pressure P of an air inlet of a constant flow hole clamp, wherein the calculation formula is as follows: p=p2-P1;
s2, collecting the temperature T of the atmosphere measured by a thermometer;
s3, the processing system calculates the flow Q of the constant flow hole by using the following formula (P，T) Comparing the flow rate Q of the constant flow rate hole (P，T) Whether within the standard flow range of the constant flow orifice of the detected specification to achieve period checking of the constant flow orifice.
Wherein P is N The atmospheric pressure under the standard condition is generally 101325Pa; t (T) N For the temperature under standard conditions, 237.15KQ was taken N Is the flow under standard conditions; z is Z N The gas compressibility factor of air is 0.99941, which is the gas compressibility factor under standard conditions; p is the air pressure at the air outlet of the dryer under the actual condition, and is the difference between the absolute pressure of the atmosphere measured by the barometer and the pressure difference measured by the pressure difference meter; t is the temperature of air at the air outlet of the dryer under the actual condition, which is the same as the ambient temperature, namely the temperature of the atmosphere measured by a thermometer; z is Z (P，T) The air compressibility factor of the air outlet of the constant flow orifice clamp is dimensionless and can be obtained by looking up a table, as shown in fig. 6.
The constant flow hole period checking device can realize periodic checking of the constant flow hole and eliminate the influence caused by the deviation of the constant flow hole in the production process; and the dryer is arranged to remove moisture in the atmosphere, so that the constant flow hole is prevented from being damaged due to the entry of the moisture.
Although the utility model has been described herein with reference to the above-described illustrative embodiments thereof, the above-described embodiments are merely preferred embodiments of the present utility model, and the embodiments of the present utility model are not limited by the above-described embodiments, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.
Claims (8)
1. The constant flow hole clamp is used for installing a constant flow hole and is characterized by comprising a base, an upper pressing ring and an upper cover, wherein a through hole is formed in the base, the upper pressing ring is connected with the upper cover, the upper pressing ring is arranged between the end faces of the base and the upper cover, an air inlet of the constant flow hole clamp is formed at one end, far away from the upper pressing ring, of the base, and an air outlet of the constant flow hole clamp is formed at one end, far away from the upper pressing ring, of the upper cover; the constant flow hole is arranged in the through holes of the base, the upper pressing ring and the upper cover, a plurality of rubber diaphragms which are used for elastically sealing the constant flow hole are arranged in the base, and the constant flow hole passes through the plurality of rubber diaphragms.
2. The constant flow orifice clamp of claim 1, wherein the base is inserted into the upper cover, and wherein at least one O-ring is disposed between the outer surface of the base and the upper cover.
3. The constant flow orifice fixture of claim 1 wherein said upper press ring is threadably connected to said base for press mounting of said plurality of rubber diaphragms by said upper press ring.
4. The constant flow orifice fixture of claim 1 wherein the constant flow orifice is disposed perpendicular to the inlet port of the constant flow orifice fixture.
5. A constant flow orifice period checking device, comprising a negative pressure generator, a mass flowmeter, a differential pressure gauge, a thermometer, an barometer, a constant flow orifice fixture according to any one of claims 1-4, wherein the negative pressure generator, the constant flow orifice fixture and the mass flowmeter are sequentially connected, a constant flow orifice to be checked is arranged on the constant flow orifice fixture, negative pressure required by the constant flow orifice operation is generated through the negative pressure generator, the mass flowmeter measures the upstream mass flow of the constant flow orifice, the differential pressure gauge measures the upstream and downstream differential pressure of the mass flowmeter, the thermometer and the barometer measure the ambient temperature and the barometer pressure, so as to check the flow value of the constant flow orifice.
6. The constant flow orifice period checking device as claimed in claim 5, wherein a dryer is further provided between the mass flowmeter and the constant flow orifice fixture.
7. The constant flow orifice period checking device according to claim 5, wherein the positive pressure port of the negative pressure generator is connected with compressed air, the negative pressure port of the negative pressure generator is connected with the air outlet of the constant flow orifice fixture, and the air outlet of the negative pressure generator is connected with the atmosphere.
8. The constant flow orifice period checking device of claim 7, wherein said compressed air is generated by a compressor or compressed air source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320977448.3U CN220583487U (en) | 2023-04-26 | 2023-04-26 | Constant flow hole fixture and period checking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320977448.3U CN220583487U (en) | 2023-04-26 | 2023-04-26 | Constant flow hole fixture and period checking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220583487U true CN220583487U (en) | 2024-03-12 |
Family
ID=90111720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320977448.3U Active CN220583487U (en) | 2023-04-26 | 2023-04-26 | Constant flow hole fixture and period checking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220583487U (en) |
-
2023
- 2023-04-26 CN CN202320977448.3U patent/CN220583487U/en active Active
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