CN221260038U - Contrast system - Google Patents
Contrast system Download PDFInfo
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- CN221260038U CN221260038U CN202322890458.6U CN202322890458U CN221260038U CN 221260038 U CN221260038 U CN 221260038U CN 202322890458 U CN202322890458 U CN 202322890458U CN 221260038 U CN221260038 U CN 221260038U
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- venturi nozzles
- comparison device
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- 238000005259 measurement Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013076 uncertainty analysis Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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Abstract
The utility model discloses a comparison system, which relates to the technical field of tester calibration equipment, and comprises a first comparison device, a temperature adjusting device and a second comparison device, wherein the first comparison device is communicated with the temperature adjusting device, the temperature adjusting device is communicated with the second comparison device, the second comparison device comprises a stagnation container, a plurality of venturi nozzles and a back flow pipe, the venturi nozzles are arranged, the input ends of the plurality of venturi nozzles are arranged on the stagnation container and are communicated with the interior of the stagnation container, the output ends of the plurality of venturi nozzles are communicated with the back flow pipe, the plurality of venturi nozzles are divided into 4 groups, and the pipeline flow is checked by setting measured parameters of the first comparison device and the second comparison device, so that the uncertainty of the flow calibration equipment is reduced, and meanwhile, the follow-up data comparison tracing can be facilitated.
Description
Technical Field
The utility model relates to the technical field of tester calibration equipment, in particular to a comparison system.
Background
In the prior art, air flow with specified flow is required to be introduced into a flow tube to be calibrated in the process of calibrating the flow tube, and then the effect of calibrating is achieved by measuring parameters of the flow tube according to the current flow state of the flow tube, but in the prior art, the accuracy of calibration is reduced due to different communication of pipelines and different calibers of the flow tube, so that larger uncertainty exists, and meanwhile, when errors are found, the source cannot be traced accurately.
Disclosure of utility model
The utility model aims to overcome the defects in the prior art and provide a comparison system.
The comparison system comprises a first comparison device, a temperature adjusting device and a second comparison device, wherein the first comparison device is communicated with the temperature adjusting device, the temperature adjusting device is communicated with the second comparison device, the second comparison device comprises a stagnation container, venturi nozzles and a back flow pipe, the venturi nozzles are arranged in a plurality, the input ends of the venturi nozzles are arranged on the stagnation container and are communicated with the interior of the stagnation container, the output ends of the venturi nozzles are communicated with the back flow pipe, the venturi nozzles are divided into 4 groups,
The throat diameter of the first group of venturi nozzles is 10 mm-12 mm;
The throat diameter of the second group of venturi nozzles is 15 mm-17 mm;
The throat diameter of the third group of venturi nozzles is 22 mm-24 mm;
The throat diameter of the fourth group of venturi nozzles is 32 mm-34 mm.
Further, a regulating valve is arranged between each venturi nozzle and the back flow pipe.
Further, the output end of the venturi nozzle is provided with a pressure tester.
Further, the first set of venturi jets comprises 1 venturi jet, the second set of venturi jets comprises 1 venturi jet, the third set of venturi jets comprises 2 venturi jets, and the fourth set of venturi jets comprises two 17 venturi jets.
Further, a pressure transmitter is arranged in the stagnation container.
Further, the three pressure transmitters are arranged, and the measuring ranges of the three pressure transmitters are 5.5MPa, 2.5MPa and 0.5MPa respectively.
Further, a temperature sensor is arranged in the stagnation container.
Further, the temperature sensors are arranged in a plurality of mode, and the temperature sensors are arranged in the stagnation container at intervals.
Compared with the prior art, the utility model has the advantages that:
The method comprises the following steps: according to the scheme, the input air flow is checked through the first comparison device and the second comparison device respectively, measured data of the first comparison device and the second comparison device are substituted into a calibration equation, uncertainty analysis of a calibration test is carried out, constant temperature treatment can be carried out on air which transits from the first comparison device to the second comparison device through the set temperature adjusting device, and therefore the calibration accuracy of the second comparison device is prevented from being influenced by high-speed air temperature rise after passing through the first comparison device.
And two,: in order to realize wider flow range coverage and higher measurement accuracy, the venturi nozzle in this scheme divide into 4 groups, and every group nozzle has different throat footpaths and flow characteristics, can satisfy the calibration demand of different flow ranges, can select suitable nozzle combination according to the flow range by calibration equipment to ensure the accuracy and the reliability of calibration, the nozzle of different groups can cover wider flow range, thereby satisfies the demand of different by calibration equipment, in addition, the grouping setting can also improve measurement accuracy. Each group of nozzles is subjected to strict calibration and comparison, and has higher measurement accuracy. By selecting an appropriate nozzle combination, more accurate flow measurement and calibration can be achieved.
Thirdly, this scheme sets up a plurality of temperature sensor in the stagnation container, and a plurality of temperature sensor interval is laid in the stagnation container, and measuring range (0 ~ 100) DEG C considers the gas temperature in the stagnation container to step unevenly, and there is great error in single temperature sensor's measured data, consequently needs scientific and reasonable to set up the temperature measurement point, through obtaining a plurality of representative temperature measurement point measured temperature, calculates the mean value mode and obtains more accurate data.
Drawings
FIG. 1 is a block diagram of a comparison system;
Fig. 2 is a block diagram of a second comparative device.
Detailed Description
1-2, Complete calibration system includes air intake system, contrast system and calibration system, and air intake system, contrast system and calibration system connect gradually, and the air current that is stable through air intake system control is input to contrast system in, checks the pipeline flow through contrast system, calibrates the flow pipe through the calibration system, contrast system includes first contrast device, temperature regulation device and second contrast device, first contrast device communicates to temperature regulation device, temperature regulation device communicates to second contrast device, checks the air current of input through first contrast device and second contrast device respectively, substitutes calibration equation with the measured data of first contrast device and second contrast device, and the uncertainty analysis of calibration test carries out constant temperature treatment to the gas of first contrast device transition to second contrast device through the temperature regulation device that sets up to prevent to influence the calibration accuracy of second contrast device through the high-speed gas temperature rise after first contrast device.
The first comparison device adopts a transmission calibration standard for a high-precision critical flow venturi nozzle for calibration test, and mainly comprises a series of venturi nozzles with sonic velocity at the throat, a pipeline, a pressure/temperature sensor, a bracket and other devices.
Preferably, the second comparison device comprises a stagnation container, venturi nozzles and a back flow pipe, wherein the venturi nozzles are provided with a plurality of venturi nozzles, the input ends of the venturi nozzles are arranged on the stagnation container and are communicated with the inside of the stagnation container, the output ends of the venturi nozzles are communicated with the back flow pipe, the number of the venturi nozzles is set into a plurality of venturi nozzles, and the nozzles with different throat diameters are arranged according to detection requirements, so that a wider flow range can be covered, and different testing requirements can be met.
Preferably, the plurality of venturi nozzles are divided into 4 groups,
The throat diameter of the first group of venturi nozzles is 10 mm-12 mm, and the first group of venturi nozzles comprises 1 venturi nozzle;
The throat diameter of the second group of venturi nozzles is 15 mm-17 mm, and the second group of venturi nozzles comprises 1 venturi nozzle;
the throat diameter of the third group of venturi nozzles is 22-24 mm, and the third group of venturi nozzles comprises 2 venturi nozzles;
The throat diameter of the fourth group of venturi nozzles is 32-34 mm, and the fourth group of venturi nozzles comprises 17 venturi nozzles.
Preferably, a regulating valve is arranged between each Venturi nozzle and the back flow pipe, and the corresponding regulating valve can be opened according to test requirements so as to control air flow to enter the corresponding Venturi nozzle for testing.
Preferably, the output end of the venturi nozzle is provided with a pressure tester, the pressure of the pipeline corresponding to the current venturi nozzle can be measured through the pressure tester, and the running state of the current pipeline can be detected, so that the follow-up data comparison tracing is facilitated.
Preferably, pressure transmitters are arranged in the stagnation container, three pressure transmitters are arranged, the measuring range sections of the three pressure transmitters are 5.5MPa, 2.5MPa and 0.5MPa respectively, and the pressure transmitters with corresponding measuring ranges are selected according to different measured pressures.
Temperature sensors are arranged in the stagnation container, a plurality of temperature sensors are arranged in the stagnation container at intervals, the measurement range (0-100) DEG C is measured, and the measurement data of the individual temperature sensors have larger errors in consideration of uneven gas temperature steps in the stagnation container, so that temperature measuring points are required to be scientifically and reasonably arranged, the temperature is measured by acquiring a plurality of representative temperature measuring points, and an average value mode is calculated.
All nozzles of the first comparison device are traced to the source in the domestic original-level device.
Aiming at a critical Venturi nozzle with the throat diameter of 8mm, the uncertainty of 0.08% of an outflow system can be ensured on a domestic primary pVTt device under the pressure of 2.5 MPa.
The highest working pressure used in the scheme is 5.3MPa, so that the nozzles with the pressure range of 2.5 MPa-5.3 MPa and throat diameter smaller than 25mm can be traced to domestic original-level devices.
The measurement errors of temperature and pressure are reasonably selected, so that the uncertainty of mass flow measurement of the first comparison device is better than 0.3%, and verification or calibration of a detected meter with 1% precision can be realized.
All venturi nozzles in the second comparison device ensure that tracing is finished on the domestic device, uncertainty of outflow coefficients of all the nozzles of the second comparison device is better than 0.3%, measurement uncertainty of the whole device can be guaranteed to be better than 0.33%, and the second comparison device can also be used as an independent system to realize verification or calibration of a detected table with 1% precision.
All nozzles in the second comparison device can also be traced by using the first comparison device in the tester, and the calibration reliability of the second comparison device can be further ensured due to the fact that the calibration conditions are consistent with the using conditions.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the description of the present utility model, a description of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The comparison system is characterized by comprising a first comparison device, a temperature regulating device and a second comparison device, wherein the first comparison device is communicated with the temperature regulating device, the temperature regulating device is communicated with the second comparison device, the second comparison device comprises a stagnation container, a plurality of venturi nozzles and a back flow pipe, the venturi nozzles are arranged, the input ends of the venturi nozzles are arranged on the stagnation container and are communicated with the interior of the stagnation container, the output ends of the venturi nozzles are communicated with the back flow pipe, the venturi nozzles are divided into 4 groups,
The throat diameter of the first group of venturi nozzles is 10 mm-12 mm;
The throat diameter of the second group of venturi nozzles is 15 mm-17 mm;
The throat diameter of the third group of venturi nozzles is 22 mm-24 mm;
The throat diameter of the fourth group of venturi nozzles is 32 mm-34 mm.
2. A contrast system according to claim 1, wherein a regulating valve is provided between each venturi nozzle and the back flow tube.
3. A contrast system as claimed in claim 1, wherein the output of the venturi nozzle is provided with a pressure tester.
4. A contrast system as claimed in claim 1, characterized in that the first set of venturi jets comprises 1 venturi jet, the second set of venturi jets comprises 1 venturi jet, the third set of venturi jets comprises 2 venturi jets, and the fourth set of venturi jets comprises two 17 venturi jets.
5. A contrast system as claimed in claim 1, wherein a pressure transmitter is provided within the stagnation vessel.
6. A comparison system according to claim 5, wherein three pressure transmitters are provided, the three pressure transmitters having measuring ranges of 5.5MPa, 2.5MPa and 0.5MPa, respectively.
7. A contrast system according to claim 1, wherein a temperature sensor is provided within the stagnation vessel.
8. A contrast system according to claim 7, wherein a plurality of temperature sensors are provided, the plurality of temperature sensors being arranged at intervals within the stagnation vessel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322890458.6U CN221260038U (en) | 2023-10-26 | 2023-10-26 | Contrast system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322890458.6U CN221260038U (en) | 2023-10-26 | 2023-10-26 | Contrast system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221260038U true CN221260038U (en) | 2024-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322890458.6U Active CN221260038U (en) | 2023-10-26 | 2023-10-26 | Contrast system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221260038U (en) |
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2023
- 2023-10-26 CN CN202322890458.6U patent/CN221260038U/en active Active
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