CN210375344U - Gas table precision calibrating device - Google Patents
Gas table precision calibrating device Download PDFInfo
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- CN210375344U CN210375344U CN201921545400.5U CN201921545400U CN210375344U CN 210375344 U CN210375344 U CN 210375344U CN 201921545400 U CN201921545400 U CN 201921545400U CN 210375344 U CN210375344 U CN 210375344U
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Abstract
The scheme discloses a gas meter precision calibration device, including examining test table, host computer, next machine and vacuum pump, examine and be equipped with infrared communication frock on the test table, infrared communication frock is used for examining the information transmission between test table, host computer, next machine and the gas table, the vacuum pump is connected with the sound velocity nozzle through the connecting pipe, the sound velocity nozzle is connected with stagnant container through the connecting pipe, and stagnant container passes through the connecting pipe with the gas table and is connected, all is equipped with the solenoid valve on the above-mentioned connecting pipe, be equipped with temperature transmitter and pressure transmitter on the connecting pipe between sound velocity nozzle and the stagnant container, temperature transmitter and pressure transmitter's signal output part all links to each other with the signal input part of next machine. The metering characteristics of its electronic type of this scheme make full use of and instantaneous flow output carry out data interaction through infrared communication mode and detection platform, realize that hot type table serialization, batchization, automatic calibration have greatly promoted production efficiency.
Description
Technical Field
The utility model belongs to gas table detection area, in particular to gas table precision calibrating device.
Background
The MEMS thermal mass gas meter is manufactured based on the micro-electromechanical system technology, adopts a flow sensor chip with a thermal mass flow principle, develops a new generation of all-electronic intelligent gas meter, and can realize the mass measurement of gas flow without temperature and pressure compensation. The MEMS thermal mass gas meter has no movable part, quick response, ultra-wide range, low pressure loss and easy maintenance and has the functions of IC card prepayment and Internet of things remote meter reading.
The MEMS thermal mass gas meter has the working principle that a thermal sensor is used for collecting flow, ambient gas is heated by a heater, the heated ambient gas generates a thermal field, and ambient temperature gradients, gas identification parameters and the like detected by upstream and downstream temperature sensors are read. The metering module is mainly used for configuring test parameters, reading internal parameter information of the thermal sensor and storing parameters such as temperature parameters and gas identification parameters, and calculating instantaneous standard condition flow. The main control module is used as an output terminal, stores the instantaneous standard condition flow and the accumulated flow, and performs data interaction with the outside in a serial port or infrared communication mode to output a test result or displays the test result through an LED lamp.
Because the MEMS thermal mass gas meter is still in a research, development and innovation stage, no calibration device specially aiming at the MEMS thermal mass gas meter exists at present, a calibration device for the MEMS thermal mass gas meter is urgently needed in the market, so that the thermal mass gas meter meets the requirements of JB/T13567-2018.
SUMMERY OF THE UTILITY MODEL
The utility model provides a gas table precision calibrating device can carry out quick calibration to MEMS hot type quality gas table, makes it satisfy JB/T13567-2018's requirement.
A gas table precision calibrating device in this scheme, including examining test table, host computer, next machine and vacuum pump, it is equipped with infrared communication frock to examine test table, infrared communication frock is used for examining the information transmission between test table, host computer, next machine and the gas table, the vacuum pump is connected with the sound velocity nozzle through the connecting pipe, the sound velocity nozzle is connected with stagnant container through the connecting pipe, and stagnant container passes through the connecting pipe with the gas table and is connected, all is equipped with the solenoid valve on the above-mentioned connecting pipe, solenoid valve and next electromechanical signal connection, be equipped with temperature transmitter and pressure transmitter on the connecting pipe between sound velocity nozzle and the stagnant container, temperature transmitter and pressure transmitter's signal output part all links to each other with the signal input part of next machine.
The working principle of the scheme is as follows: the MEMS thermal mass gas meter is installed on a detection table, after initial calibration parameters and re-calibration parameters are set on an operation program of an upper computer, a vacuum pump is started, a click test is carried out, the upper computer sends a test starting instruction to the detection table through an infrared communication tool, and an instantaneous flow test mode is started. When the gas flowing through the sonic nozzle reaches a critical flow state, the mass flow of the gas flowing through the nozzle is kept unchanged, the instantaneous flow of the gas flowing through the sonic nozzle can be calculated according to a formula because the temperature and the pressure are constant and the volume flow is unchanged, the passing gas equation is converted into the actual instantaneous flow passing through a detected table according to a continuity principle, and the initial indication value error is calculated through the actual instantaneous flow and the detected table instantaneous flow meter. The first calibration procedure is completed, then the upper computer generates a coefficient correction list according to the initial error value, the coefficient correction list is written into the metering module through the infrared communication tool, the metering module corrects the gas meter, the second calibration procedure is started after the correction, the first calibration procedure is the same as the second calibration procedure, and the upper computer compares the test result of the second calibration procedure with the standard requirement to judge a test conclusion.
The beneficial effect of this scheme does: the metering characteristics of its electronic type of this scheme make full use of and instantaneous flow output carry out data interaction through infrared communication mode and detection platform, realize that hot type table serialization, batchization, automatic calibration have greatly promoted production efficiency.
Further, the lower computer is connected with the upper computer through an RS485 serial port. The RS-485 interface adopts the combination of a balanced driver and a differential receiver, so that the common-mode interference resistance is enhanced, namely, the noise interference resistance is good, and the chip of the interface circuit is not easy to damage.
Further, the upper computer is connected with the infrared communication tool through an RS485 serial port. The RS-485 interface adopts the combination of a balanced driver and a differential receiver, so that the common-mode interference resistance is enhanced, namely, the noise interference resistance is good, and the chip of the interface circuit is not easy to damage.
Further, the detection platform is a bell-type detection platform. The bell-type detection table is reasonable in structure, small in occupied space, convenient to use, low in economic cost and convenient to purchase.
Drawings
Fig. 1 is the utility model relates to a gas table precision calibrating device's schematic diagram.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a detection table 1, a gas meter 2, a connecting pipe 3, an electromagnetic valve 4, a stagnation container 5, a sonic nozzle 6, a vacuum pump 7, a lower computer 8, a temperature transmitter 9, an upper computer 10, a pressure transmitter 11 and an infrared communication tool 12.
The embodiment is basically as shown in the attached figure 1: a gas meter precision calibration device comprises a detection table 1 (adopting a bell-type detection table), an upper computer 10, a lower computer 8 and a vacuum pump 7, wherein an infrared communication tool 12 is arranged on the detection table 1, the infrared communication tool 12, the detection table 1, the upper computer 10, the lower computer 8 and a gas meter 2 are connected through RS485 serial ports to realize information transmission, the vacuum pump 7 is connected with a sound velocity nozzle 6 through a connecting pipe 3, the sound velocity nozzle 6 is connected with a stagnation container 5 through the connecting pipe 3, the stagnation container 5 is connected with the gas meter 2 through the connecting pipe 3, all be equipped with solenoid valve 4 on above-mentioned connecting pipe 3, solenoid valve 4 and the 8 signal connection of next machine, be equipped with temperature transmitter 9 and pressure transmitter 11 on the connecting pipe 3 between sonic nozzle 6 and stagnant container 5, the signal output part of temperature transmitter 9 and pressure transmitter 11 all links to each other with the signal input part of next machine 8.
The specific implementation process is as follows: the MEMS thermal mass gas meter 2 is installed on the detection table 1, after initial calibration parameters and re-calibration parameters are set on an operation program of the upper computer 10, the vacuum pump 7 is started, a click test is carried out, the upper computer 10 sends a test starting instruction to the detection table 1 through the infrared communication tool 12, and an instantaneous flow test mode is started. When the gas flowing through the sonic nozzle 6 reaches a critical flow state, the mass flow of the gas flowing through the nozzle is kept unchanged, the instantaneous flow of the gas flowing through the sonic nozzle 6 can be calculated according to a formula because the temperature and the pressure are constant and the volume flow is unchanged, the gas passing equation is converted into the actual instantaneous flow passing through a detected table according to the fluid mechanics continuity principle, and the initial indication value error is calculated through the actual instantaneous flow and the detected table instantaneous flow meter. Thus, the first calibration procedure is completed, the upper computer 10 generates a coefficient correction list according to the initial error value, the coefficient correction list is written into the metering module through the infrared communication tool 12, the metering module corrects the gas meter 2, the second calibration procedure is started after the completion of the first calibration procedure, the first calibration procedure is the same as the first calibration procedure, and the upper computer 10 judges a test conclusion according to the comparison of the test result of the second calibration procedure and the standard requirement.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (4)
1. The utility model provides a gas table precision calibrating device which characterized in that: including examining test table, host computer, next computer and vacuum pump, it is equipped with infrared communication frock to examine test table, infrared communication frock is used for examining the information transmission between test table, host computer, next computer and the gas table, the vacuum pump is connected with the sound velocity nozzle through the connecting pipe, the sound velocity nozzle is connected with stagnant container through the connecting pipe, and stagnant container passes through the connecting pipe with the gas table and is connected, all is equipped with the solenoid valve on the above-mentioned connecting pipe, solenoid valve and next electromechanical signal connection, be equipped with temperature transmitter and pressure transmitter on the connecting pipe between sound velocity nozzle and the stagnant container, temperature transmitter and pressure transmitter's signal output part all links to each other with the signal input part of next computer.
2. The gas meter accuracy calibration device according to claim 1, characterized in that: and the lower computer is connected with the upper computer through an RS485 serial port.
3. The gas meter accuracy calibration device according to claim 2, characterized in that: and the upper computer is connected with the infrared communication tool through an RS485 serial port.
4. The gas meter accuracy calibration device according to claim 3, characterized in that: the detection table is a bell-type detection table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921545400.5U CN210375344U (en) | 2019-09-17 | 2019-09-17 | Gas table precision calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921545400.5U CN210375344U (en) | 2019-09-17 | 2019-09-17 | Gas table precision calibrating device |
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| CN210375344U true CN210375344U (en) | 2020-04-21 |
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| CN201921545400.5U Active CN210375344U (en) | 2019-09-17 | 2019-09-17 | Gas table precision calibrating device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013928A (en) * | 2020-08-27 | 2020-12-01 | 江苏省计量科学研究院(江苏省能源计量数据中心) | Gas meter temperature/pressure adaptability integrated detection device and method |
| CN112268601A (en) * | 2020-09-22 | 2021-01-26 | 浙江威星智能仪表股份有限公司 | Base meter measurement calibration method based on sonic nozzle measurement platform |
| CN117422450A (en) * | 2023-12-18 | 2024-01-19 | 贵州鸿达立信计量检测有限公司 | Digital maintenance system for metering equipment |
-
2019
- 2019-09-17 CN CN201921545400.5U patent/CN210375344U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112013928A (en) * | 2020-08-27 | 2020-12-01 | 江苏省计量科学研究院(江苏省能源计量数据中心) | Gas meter temperature/pressure adaptability integrated detection device and method |
| CN112268601A (en) * | 2020-09-22 | 2021-01-26 | 浙江威星智能仪表股份有限公司 | Base meter measurement calibration method based on sonic nozzle measurement platform |
| CN117422450A (en) * | 2023-12-18 | 2024-01-19 | 贵州鸿达立信计量检测有限公司 | Digital maintenance system for metering equipment |
| CN117422450B (en) * | 2023-12-18 | 2024-03-26 | 贵州鸿达立信计量检测有限公司 | Digital maintenance system for metering equipment |
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