CN212432202U - Special gas calibration device - Google Patents
Special gas calibration device Download PDFInfo
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- CN212432202U CN212432202U CN202021347443.5U CN202021347443U CN212432202U CN 212432202 U CN212432202 U CN 212432202U CN 202021347443 U CN202021347443 U CN 202021347443U CN 212432202 U CN212432202 U CN 212432202U
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Abstract
The utility model provides a special gas calibration device, which comprises a cover body and sixteen sensor installation cavities, wherein every four of the sixteen sensor installation cavities form a shunting group; a first-stage flow dividing cavity is arranged at the central position of the upper part of the cover body, a first-stage air inlet is formed in the top of the first-stage flow dividing cavity, a first-stage rectifying tube is arranged in the first-stage flow dividing cavity, and the bottom of the first-stage flow dividing cavity is a spherical inner wall and is provided with a first-stage flow dividing tip; the upper part of the cover body is provided with a secondary flow dividing cavity corresponding to the center of the flow dividing group; the top of the second-level flow dividing cavity is provided with a second-level air inlet, a second-level rectifying tube is arranged inside the second-level flow dividing cavity, and the bottom of the second-level flow dividing cavity is a spherical inner wall and is provided with a second-level flow dividing top tip; the upper part of the second-stage flow distribution cavity is respectively communicated with four sensor installation cavities in the flow distribution group through four second-stage flow distribution bent pipes; the upper part of the first-stage flow dividing cavity is respectively communicated with the second-stage air inlet through four first-stage flow dividing bent pipes. The device can improve the gas calibration efficiency.
Description
Technical Field
The utility model relates to a measurement field, specific theory has related to a special gas calibration device.
Background
The special gas belongs to the category of gas with special purposes, and the calibration method is the same as that of common gas, and methods such as a mass method, a volume method, a velocity method and the like are generally adopted. The fluid is divided into gas and liquid, the fluid has the characteristic of easy flowing, and the gas has extremely strong compressibility compared with the liquid; the gas has extremely strong molecular thermal motion characteristics, so that the gas is greatly influenced by temperature, and the gas calibration is more difficult. The thermal motion characteristics of the gas molecules directly affect the actual molecular weight of the gas in the container, thereby affecting the consistency of gas calibration and resulting in lower efficiency and accuracy of gas calibration.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a special gas calibration device comprises a cover body, wherein sixteen sensor installation cavities are arranged at the bottom of the cover body in a square array mode, and four of the sixteen sensor installation cavities form a group of four groups of square shunt groups;
a first-stage flow dividing cavity is arranged at the central position of the upper part of the cover body, a first-stage air inlet is formed in the top of the first-stage flow dividing cavity, a first-stage rectifying tube communicated with the first-stage air inlet is arranged in the first-stage flow dividing cavity, the bottom of the first-stage flow dividing cavity is a spherical inner wall, and a first-stage flow dividing tip is arranged at the position, opposite to the opening of the first-stage rectifying tube, of the spherical inner wall;
the upper part of the cover body is provided with a secondary flow dividing cavity corresponding to the center of the flow dividing group; the top of the second-level flow dividing cavity is provided with a second-level air inlet, a second-level rectifier tube communicated with the second-level air inlet is arranged inside the second-level flow dividing cavity, the bottom of the second-level flow dividing cavity is a spherical inner wall, and a second-level flow dividing center is arranged at a position, opposite to the opening of the second-level rectifier tube, of the spherical inner wall;
the upper part of the second-stage flow distribution cavity is respectively communicated with four sensor installation cavities in the flow distribution group through four second-stage flow distribution bent pipes;
the upper part of the first-level flow distribution cavity is respectively communicated with the second-level air inlets at the tops of the four second-level flow distribution cavities through four first-level flow distribution bent pipes.
Based on the above, the cavity volume of the first-stage flow cavity is larger than the cavity volume of the second-stage flow cavity.
Based on the above, four first-stage flow dividing air outlets are formed in the first-stage flow dividing cavity; the four first-stage shunt air outlets are positioned at the same height and are respectively communicated with the first-stage shunt elbow, and the lengths of the four first-stage shunt elbows are equal.
Based on the above, four secondary flow-dividing air outlets are formed in the secondary flow-dividing cavity; the four secondary shunt air outlets are positioned at the same height and are respectively communicated with the secondary shunt elbow, and the lengths of the four secondary shunt elbows are equal.
Based on the above, the length of the first-stage rectifying tube is more than or equal to ten times the diameter of the first-stage air inlet.
Based on the above, the length of the secondary rectifier tube is more than or equal to ten times the diameter of the primary air inlet.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model provides a pair of special gas calibration device adopts the mode of theoretical calculation and finite element to model the analysis, through the flow characteristic of simulation gas in closed cavity and closed pipeline, through design route and flow path sectional area, realizes the uniformity of each spout flow. Specifically, the special gas calibration device achieves the effect of multi-pipe uniform flow distribution after flowing through the device by utilizing the flow rectification and flow distribution, flow rectification again and flow distribution of the pipeline and controlling the flow of the main line through a standard flow meter. The flow equalization can be realized by one primary air inlet, the flow equalization of 16 air outlets is realized, and the equalization repeatability is about 0.29%. The device can realize the requirement of calibrating 16 sensors simultaneously through one gas flowmeter, and greatly improves the original calibration efficiency.
Drawings
Fig. 1 is a schematic view of the overall structure of a special gas calibration device provided by the present invention.
Fig. 2 is a schematic bottom structure diagram of a special gas calibration device provided by the present invention.
Fig. 3 is a schematic view of a bottom structure of a special gas calibration device provided by the present invention.
Fig. 4 is a schematic structural view of a special gas calibration apparatus along a-a section.
Fig. 5 is a schematic structural view of a special gas calibration apparatus along the section B-B according to the present invention.
In the figure: 1. a primary air inlet; 2. a first-stage flow-dividing bent pipe; 3. a cover body; 4. a sensor mounting cavity; 5. a first stage flow dividing chamber; 6. a first-stage flow-dividing tip; 7. a first stage split flow air outlet; 8. a secondary flow-dividing tip; 9. a second stage flow-dividing chamber; 10. a secondary flow-dividing bent pipe; 11. a first-stage rectifier tube; 12. a second-stage rectifier tube; 13. and a secondary flow-dividing air outlet.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
Example 1
The embodiment provides a special gas calibration device, which is shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 and comprises a cover body 3. Sixteen sensor installation cavities 4 are arranged in a square array at the bottom of the cover body 3, and four of the sixteen sensor installation cavities 4 form four groups of square shunt groups.
A first sub-flow-dividing cavity 5 is arranged at the upper central position of the cover body 3. The top of the first-stage flow dividing cavity 5 is provided with a first-stage air inlet 1. The first-stage flow cavity 5 is internally provided with a first-stage rectifying pipe 11 communicated with the first-stage air inlet 1. The bottom of the first-stage flow dividing cavity 5 is a spherical inner wall, and a first-stage flow dividing tip 6 is arranged at a position, opposite to the opening of the first-stage rectifying tube 11, of the spherical inner wall.
The upper part of the cover body 3 is provided with two-stage flow dividing cavities 9 corresponding to the center of the flow dividing group. The top of the second-level flow-dividing cavity 9 is provided with a second-level air inlet. And a secondary rectifying tube 12 communicated with a secondary air inlet is arranged in the secondary flow dividing cavity 9. The bottom of the second-level flow dividing cavity 9 is a spherical inner wall, and a second-level flow dividing tip 8 is arranged at a position, right opposite to the opening of the second-level rectifying tube 12, of the spherical inner wall.
The upper part of the second-stage flow dividing cavity 9 is respectively communicated with the four sensor installation cavities 4 in the flow dividing group through four second-stage flow dividing bent pipes 10.
The upper part of the first-stage flow dividing cavity 5 is respectively communicated with the second-stage air inlets at the tops of the four second-stage flow dividing cavities 9 through four first-stage flow dividing bent pipes 2.
Wherein the cavity volume of the first-stage flow-dividing cavity 5 is larger than that of the second-stage flow-dividing cavity 9.
Four first-stage branch air outlets 7 are formed in the first-stage branch cavity 5. The four first-stage shunt air outlets 7 are positioned at the same height and are respectively communicated with the first-stage shunt elbow 2. The four primary flow-dividing elbows 2 are equal in length.
Four secondary flow-dividing air outlets 13 are formed in the secondary flow-dividing cavity 9. The four secondary shunt air outlets 13 are located at the same height and are respectively communicated with the secondary shunt elbow 10, and the four secondary shunt elbows 10 are equal in length.
In this embodiment, the length of the first-stage rectifying tube 11 is equal to ten times the diameter of the first-stage inlet 1. The length of the secondary rectifier tube 12 is equal to ten times the diameter of the primary inlet 1.
Specifically, the theoretical basis adopted by the device is as follows:
ρ1×v1×A1＝ρ2×v2×A2
according to the above continuous flow equation, when gas flows in the same pipe, the ratio of the pipe cross-sectional areas is equal to the inverse ratio of the gas flow speed. The flow rate ratio of the gas is equal to the cross-sectional area ratio under the same pipeline, the same pressure and the same flow rate.
Specifically, the finite element analysis result of the special gas calibration device shows that the device can achieve the effect of multi-pipe uniform flow distribution after flowing through the device by rectifying and distributing, re-rectifying and re-distributing through a pipeline, controlling the flow of a main pipeline through a standard flowmeter.
The specific simulation results are as follows:
the boundary conditions are ambient pressure 1; outlet/inlet flow 0.500217
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.505482
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.501954
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.505488
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.5056
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.502577
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.506174
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.508847
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.504519
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.507939
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.507119
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.50038
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.501756
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.50502
The boundary conditions are ambient pressure 1; outlet/inlet flow 0.50308
The boundary conditions are ambient pressure 1; outlet/inlet flow is 0.509456.
The repeatability of each gas flow nozzle is 0.002859, which can be found by calculation of a standard deviation formula, and the 1.5% FS calibration requirement of 1/3 gas calibration is met.
In the formula: n represents the nth nozzle; ei represents the average of the flow rate ratio of each jet; eij represents the difference between the jth jet and the average;
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (6)
1. A special gas calibration device is characterized in that: the sensor mounting device comprises a cover body, wherein sixteen sensor mounting cavities are arranged at the bottom of the cover body in a square array mode, and four of the sixteen sensor mounting cavities form four groups of square shunt groups;
a first-stage flow dividing cavity is arranged at the central position of the upper part of the cover body, a first-stage air inlet is formed in the top of the first-stage flow dividing cavity, a first-stage rectifying tube communicated with the first-stage air inlet is arranged in the first-stage flow dividing cavity, the bottom of the first-stage flow dividing cavity is a spherical inner wall, and a first-stage flow dividing tip is arranged at the position, opposite to the opening of the first-stage rectifying tube, of the spherical inner wall;
the upper part of the cover body is provided with a secondary flow dividing cavity corresponding to the center of the flow dividing group; the top of the second-level flow dividing cavity is provided with a second-level air inlet, a second-level rectifier tube communicated with the second-level air inlet is arranged inside the second-level flow dividing cavity, the bottom of the second-level flow dividing cavity is a spherical inner wall, and a second-level flow dividing center is arranged at a position, opposite to the opening of the second-level rectifier tube, of the spherical inner wall;
the upper part of the second-stage flow distribution cavity is respectively communicated with four sensor installation cavities in the flow distribution group through four second-stage flow distribution bent pipes;
the upper part of the first-level flow distribution cavity is respectively communicated with the second-level air inlets at the tops of the four second-level flow distribution cavities through four first-level flow distribution bent pipes.
2. The special gas calibration device as recited in claim 1, wherein: the cavity volume of the first-stage flow dividing cavity is larger than that of the second-stage flow dividing cavity.
3. The special gas calibration device as recited in claim 2, wherein: four first-stage flow dividing air outlets are formed in the first-stage flow dividing cavity; the four first-stage shunt air outlets are positioned at the same height and are respectively communicated with the first-stage shunt elbow, and the lengths of the four first-stage shunt elbows are equal.
4. The special gas calibration device as recited in claim 3, wherein: four secondary flow-dividing air outlets are formed in the secondary flow-dividing cavity; the four secondary shunt air outlets are positioned at the same height and are respectively communicated with the secondary shunt elbow, and the lengths of the four secondary shunt elbows are equal.
5. The special gas calibration device as recited in claim 4, wherein: the length of the first-stage rectifying tube is more than or equal to ten times of the diameter of the first-stage air inlet.
6. The special gas calibration device as recited in claim 5, wherein: the length of the second-stage rectifying tube is more than or equal to ten times of the diameter of the first-stage air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021347443.5U CN212432202U (en) | 2020-07-10 | 2020-07-10 | Special gas calibration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021347443.5U CN212432202U (en) | 2020-07-10 | 2020-07-10 | Special gas calibration device |
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| Publication Number | Publication Date |
|---|---|
| CN212432202U true CN212432202U (en) | 2021-01-29 |
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| CN202021347443.5U Active CN212432202U (en) | 2020-07-10 | 2020-07-10 | Special gas calibration device |
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| CN (1) | CN212432202U (en) |
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- 2020-07-10 CN CN202021347443.5U patent/CN212432202U/en active Active
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Effective date of registration: 20211115 Address after: 465500 No. 68, Lanhe Electronic Technology Park, Xinxian industrial cluster, Xinyang City, Henan Province Patentee after: Xinyang Weisheng Electronic Technology Co., Ltd Address before: 450001 No. 299 shuttle Road, Zhengzhou hi tech Development Zone, Henan, China Patentee before: Zhengzhou Weisheng Electronic Technology Co., Ltd |
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