阅读说明：本技术 流量计的校准装置及其校准方法、以及待测流量计组件 (Flowmeter calibrating device and method and flowmeter assembly to be measured ) 是由 孙琦 马怀宇 吴继权 谢青延 黄强 龚炯波 于 2021-09-23 设计创作，主要内容包括：本发明公开一种流量计的校准装置及其校准方法、以及待测流量计组件,所述流量计的校准装置的校准方法包括：获取所述称重装置计量的所述计量液氮储罐的初始液氮的重量W1；在对所述待测流量计组件进行测量之后,获取所述计量液氮储罐的液氮的重量W2、以及所述稳压装置内的氮气的重量W3,并将从所述待测流量计组件读取的氮气流量值换算成氮气的重量W；根据W1、W2和W3计算差值得到待测流量计组件流过的氮气质量ΔW；对比W和ΔW得到所述待测流量计组件的误差；从而完成对流量计校验的整个过程；通过在一定的校验时间,提供压力稳定的环境,流量相对稳定的排放工况,减少校验的误差,提高校验精准度。(The invention discloses a calibrating device of a flowmeter, a calibrating method thereof and a flowmeter assembly to be measured, wherein the calibrating method of the calibrating device of the flowmeter comprises the following steps: acquiring the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device; after the flowmeter component to be measured is measured, acquiring the weight W2 of liquid nitrogen of the metering liquid nitrogen storage tank and the weight W3 of nitrogen in the pressure stabilizing device, and converting the nitrogen flow value read from the flowmeter component to be measured into the weight W of the nitrogen; calculating the difference according to W1, W2 and W3 to obtain the mass delta W of nitrogen flowing through the flowmeter component to be measured; comparing W with delta W to obtain the error of the flowmeter component to be measured; thereby completing the whole process of flow meter calibration; through in certain check-up time, provide the environment of pressure stability, the discharge operating mode of flow relatively stable reduces the error of check-up, improves the check-up precision.)

1. A calibration method of a calibration device of a flow meter is characterized in that the calibration device of the flow meter comprises a liquid nitrogen output device, a gasification device, a pressure stabilizing device, a connecting pipeline and a control device, the liquid nitrogen output device comprises a metering liquid nitrogen storage tank for outputting liquid nitrogen and a weighing device for weighing the metering liquid nitrogen storage tank, the input end of the gasification device is connected with the metering liquid nitrogen storage tank, the gasification device is used for converting the liquid nitrogen input by the input end into nitrogen, the input end of the pressure stabilizing device is connected with the output end of the gasification device so as to stabilize the pressure of the nitrogen gasified by the gasification device and then output the nitrogen, one end of the connecting pipeline is connected with the pressure stabilizing device, the other end of the connecting pipeline is connected with a flow meter component to be tested, and the control device is electrically connected with the weighing device, the gasification device and the pressure stabilizing device, the calibration method of the calibration device of the flow meter is applied to the control device, and comprises the following steps:

acquiring the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device;

after the flowmeter component to be measured is measured, acquiring the weight W2 of liquid nitrogen of the metering liquid nitrogen storage tank and the weight W3 of nitrogen in the pressure stabilizing device, and converting the nitrogen flow value read from the flowmeter component to be measured into the weight W of the nitrogen;

calculating the difference according to W1, W2 and W3 to obtain the mass delta W of nitrogen flowing through the flowmeter component to be measured;

and comparing W with the delta W to obtain the error of the flowmeter component to be measured.

2. The method for calibrating a calibration device for a flow meter according to claim 1, characterized in that said vaporizing device comprises an electrically heated vaporizer, the input of which is connected to said tank for metering liquid nitrogen, the output of which is connected to the input of said pressure stabilizing device;

after the step of obtaining the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device, the method comprises the following steps:

and controlling the electric heating gasifier to work, converting the liquid nitrogen input from the input end into nitrogen, and outputting the nitrogen from the output end of the electric heating gasifier to the pressure stabilizing device.

3. The method for calibrating a calibration device for a flow meter according to claim 2, wherein a first stop valve and a first regulating valve are connected to an output end of the pressure stabilizer in this order, and the control device is electrically connected to the stop valve and the first regulating valve;

the step of controlling the operation of the electric heating gasifier, converting the liquid nitrogen input from the input end into nitrogen gas, and outputting the nitrogen gas from the output end of the electric heating gasifier to the pressure stabilizing device comprises the following steps:

when the pressure value in the pressure stabilizing device reaches a set basic pressure value, controlling the stop valve to open;

and controlling the opening degree of the first regulating valve to enable the pressure stabilizing device to output a set pressure value.

4. The method of calibrating a flow meter calibration device according to claim 3 wherein said vaporizing device includes a power conditioning circuit connected to said electrically heated vaporizer, said control device being electrically connected to said power conditioning circuit;

the step of controlling the operation of the electric heating vaporizer, converting the liquid nitrogen input from the input end into nitrogen gas, and outputting the nitrogen gas from the output end of the electric heating vaporizer into the pressure stabilizing device, further includes:

when the nitrogen in the pressure stabilizing device is smaller than a set basic pressure value, controlling the power regulating circuit to increase the power of the electric heating gasifier;

and when the nitrogen in the pressure stabilizing device is larger than a set basic pressure value, controlling the power regulating circuit to reduce the power of the electric heating gasifier.

5. The method for calibrating the calibration device of the flowmeter according to claim 1, wherein the liquid nitrogen output device comprises a total liquid nitrogen storage tank, an input end of the metering liquid nitrogen storage tank is connected with an output end of the total liquid nitrogen storage tank, and the weighing device comprises a weigher arranged at a lower end of the metering liquid nitrogen storage tank;

the step of obtaining the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device comprises the following steps:

inputting liquid nitrogen from the total liquid nitrogen storage tank to the metering liquid nitrogen storage tank, and controlling the weighing device to obtain the weight W1 of the initial liquid nitrogen input to the metering liquid nitrogen storage tank.

6. A calibration device for a flow meter, comprising:

the liquid nitrogen output device comprises a metering liquid nitrogen storage tank for outputting liquid nitrogen and a weighing device for weighing the metering liquid nitrogen storage tank;

the input end of the gasification device is connected to the metering liquid nitrogen storage tank, and the gasification device is used for converting liquid nitrogen input by the input end into nitrogen;

the input end of the pressure stabilizing device is connected with the output end of the gasification device so as to stabilize the pressure of the nitrogen gasified by the gasification device and then output the nitrogen;

one end of the connecting pipeline is connected with the pressure stabilizing device, and the other end of the connecting pipeline is used for being connected with the flowmeter component to be measured; and the number of the first and second groups,

a control device electrically connected to the weighing device, the vaporizing device and the pressure stabilizer, the control device comprising a memory storing a control program of a calibration device of a flow meter, the control program of the calibration device of the flow meter being configured to implement the steps of the calibration method of the calibration device of the flow meter according to any one of claims 1 to 5.

7. The flowmeter calibrating device according to claim 6, further comprising a plurality of branch lines connected in parallel, wherein one end of each branch line is connected to the pressure stabilizer, the other end of each branch line is connected to the connecting line, each branch line is provided with a drain valve and a drain stop valve connected in sequence, and the corresponding drain stop valve is selectively opened to adjust the flow path diameter of the corresponding drain valve to be matched with the flow path diameter of the flowmeter.

8. The flowmeter calibrating device as set forth in claim 7, wherein the output end of said pressure stabilizer is connected to a first regulating valve, and the diameter of the flow path of the opening of said first regulating valve is greater than 5% to 15% of the diameter of the flow path of said drain valve corresponding to the connected open drain cut valve.

9. The flowmeter calibrating device according to claim 6, wherein said liquid nitrogen output device further comprises a total liquid nitrogen storage tank, an output end of said total liquid nitrogen storage tank is connected to said metering liquid nitrogen storage tank, and said weighing device comprises a weighing device arranged at a lower end of said metering liquid nitrogen storage tank.

10. A flow meter assembly under test for use in a method of calibrating a calibration device for a flow meter as claimed in any one of claims 1 to 5, the flow meter assembly under test comprising:

the accessories are connected with the connecting pipeline and comprise a second regulating valve, a fluid director and a second stop valve which are sequentially connected; and the number of the first and second groups,

and the flow meter is positioned between the flow guider and the second stop valve.

Technical Field

The invention relates to the technical field of flowmeter calibration, in particular to a flowmeter calibration device, a flowmeter calibration method and a flowmeter assembly to be measured.

Background

One of the main contents of the safety valve type test is the discharge capacity test of the safety valve. The displacement test of safety valves generally uses a flow meter. To ensure the accuracy and traceability of the flow measurement, the flow meter used is required to be calibrated.

The current calibration technology is to perform geometric calibration on the flowmeter body, i.e. to verify the geometric dimension compliance. Disassembling a flow meter orifice plate or a throttling device to be verified, measuring the geometric dimension, and verifying the conformance of the flow meter orifice plate or the throttling device by comparing the geometric dimension of a piece to be tested with that of a standard piece; or a flowmeter with higher precision is compared with a flowmeter to be calibrated in series through a comparison method, the accuracy of flow measurement is related to the pressure drop in the flow process, the existing method only relates to the calibration of geometric dimensions, the flow of the fluid does not consider the situation that the standard requirements are not in accordance with the reality or the parameters of control components (a control valve, a valve connected with a container and the like) are different due to the difference of the process of each set of measuring device, and further the formed pressure drops are different to cause the inaccuracy of the verification result.

Disclosure of Invention

The invention mainly aims to provide a calibration method of a flowmeter calibration device, a flowmeter calibration device and a flowmeter assembly to be tested, and aims to solve the problems that the detection result error is large and the verification is inaccurate because the pressure stability is not ensured in the conventional flowmeter verification.

In order to achieve the above object, the calibration device of the flow meter provided by the present invention includes a liquid nitrogen output device, a gasification device, a pressure stabilizer, a connection pipeline, and a control device, wherein the liquid nitrogen output device includes a metering liquid nitrogen storage tank for outputting liquid nitrogen and a weighing device for weighing the metering liquid nitrogen storage tank, an input end of the gasification device is connected to the metering liquid nitrogen storage tank, the gasification device is used for converting the liquid nitrogen input by the input end into nitrogen gas, an input end of the pressure stabilizer is connected to an output end of the gasification device so as to output the nitrogen gas gasified by the gasification device after stabilizing pressure, one end of the connection pipeline is connected to the pressure stabilizer, the other end of the connection pipeline is used for connecting to a flow meter component to be measured, and the control device is connected to the weighing device, The gasification device is electrically connected with the pressure stabilizing device, the calibration method of the calibration device of the flow meter is applied to the control device, and the calibration method of the calibration device of the flow meter comprises the following steps:

acquiring the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device;

after the flowmeter component to be measured is measured, acquiring the weight W2 of liquid nitrogen of the metering liquid nitrogen storage tank and the weight W3 of nitrogen in the pressure stabilizing device, and converting the nitrogen flow value read from the flowmeter component to be measured into the weight W of the nitrogen;

calculating the difference according to W1, W2 and W3 to obtain the mass delta W of nitrogen flowing through the flowmeter component to be measured;

and comparing W with the delta W to obtain the error of the flowmeter component to be measured.

Optionally, the gasification device comprises an electric heating gasifier, an input end of the electric heating gasifier is connected to the metering liquid nitrogen storage tank, and an output end of the electric heating gasifier is connected to an input end of the pressure stabilizing device;

after the step of obtaining the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device, the method comprises the following steps:

and controlling the electric heating gasifier to work, converting the liquid nitrogen input from the input end into nitrogen, and outputting the nitrogen from the output end of the electric heating gasifier to the pressure stabilizing device.

Optionally, the output end of the pressure stabilizer is sequentially connected with a first stop valve and a first regulating valve, and the control device is electrically connected with the stop valve and the first regulating valve;

the step of controlling the operation of the electric heating gasifier, converting the liquid nitrogen input from the input end into nitrogen gas, and outputting the nitrogen gas from the output end of the electric heating gasifier to the pressure stabilizing device comprises the following steps:

when the pressure value in the pressure stabilizing device reaches a set basic pressure value, controlling the stop valve to open;

and controlling the opening degree of the first regulating valve to enable the pressure stabilizing device to output a set pressure value.

Optionally, the gasification device includes a power regulating circuit connected to the electrically heated gasifier, and the control device is electrically connected to the power regulating circuit;

the step of controlling the operation of the electric heating vaporizer, converting the liquid nitrogen input from the input end into nitrogen gas, and outputting the nitrogen gas from the output end of the electric heating vaporizer into the pressure stabilizing device, further includes:

when the nitrogen in the pressure stabilizing device is smaller than a set basic pressure value, controlling the power regulating circuit to increase the power of the electric heating gasifier;

and when the nitrogen in the pressure stabilizing device is larger than a set basic pressure value, controlling the power regulating circuit to reduce the power of the electric heating gasifier.

Optionally, the liquid nitrogen output device includes a total liquid nitrogen storage tank, an input end of the metering liquid nitrogen storage tank is connected to an output end of the total liquid nitrogen storage tank, and the weighing device includes a weigher disposed at a lower end of the metering liquid nitrogen storage tank;

the step of obtaining the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank metered by the weighing device comprises the following steps:

inputting liquid nitrogen from the total liquid nitrogen storage tank to the metering liquid nitrogen storage tank, and controlling the weighing device to obtain the weight W1 of the initial liquid nitrogen input to the metering liquid nitrogen storage tank.

The invention provides a calibration device of a flowmeter, comprising:

the liquid nitrogen output device comprises a metering liquid nitrogen storage tank for outputting liquid nitrogen and a weighing device for weighing the metering liquid nitrogen storage tank;

the input end of the gasification device is connected to the metering liquid nitrogen storage tank, and the gasification device is used for converting liquid nitrogen input by the input end into nitrogen;

the input end of the pressure stabilizing device is connected with the output end of the gasification device so as to stabilize the pressure of the nitrogen gasified by the gasification device and then output the nitrogen;

one end of the connecting pipeline is connected with the pressure stabilizing device, and the other end of the connecting pipeline is used for being connected with the flowmeter component to be measured; and the number of the first and second groups,

the control device is electrically connected with the weighing device, the gasifying device and the pressure stabilizing device and comprises a memory, the memory stores a control program of the calibrating device of the flowmeter, and the control program of the calibrating device of the flowmeter is configured to realize the steps of the calibrating method of the calibrating device of the flowmeter.

Optionally, the calibration device of the flow meter further includes a plurality of branch pipelines connected in parallel, one end of each branch pipeline is connected to the pressure stabilizing device, the other end of each branch pipeline is connected to the connecting pipeline, each branch pipeline is provided with a drain valve and a drain stop valve which are connected in sequence, and the corresponding drain stop valve is selectively opened to adjust the diameter of the corresponding flow channel of the drain valve to be matched with the diameter of the flow channel of the flow meter.

Optionally, an output end of the pressure stabilizer is connected to a first regulating valve, and a diameter of a flow passage of an opening of the first regulating valve is greater than 5% to 15% of a diameter of a flow passage of the drain valve corresponding to the correspondingly connected opened drain stop valve.

Optionally, the liquid nitrogen output device further includes a total liquid nitrogen storage tank, an output end of the total liquid nitrogen storage tank is connected to the metering liquid nitrogen storage tank, and the weighing device includes a weigher disposed at a lower end of the metering liquid nitrogen storage tank.

The invention also provides a flowmeter assembly to be measured, which is used in the calibration method of the calibration device of the flowmeter, and the flowmeter assembly to be measured comprises:

the accessories are connected with the connecting pipeline and comprise a second regulating valve, a fluid director and a second stop valve which are sequentially connected; and the number of the first and second groups,

and the flow meter is positioned between the flow guider and the second stop valve.

According to the technical scheme, liquid nitrogen is input into the metering liquid nitrogen storage tank, the weight W1 of the input liquid nitrogen is obtained through the weighing device, the input liquid nitrogen is converted into nitrogen through the gasification device, and the nitrogen passes through the pressure stabilizing device, so that the pressure stabilizing device outputs the nitrogen with stable air pressure to the flow meter component to be measured; after the flow meter component to be tested is measured for a period of time, the weight W2 of the residual liquid nitrogen of the liquid nitrogen measuring storage tank and the weight W3 of the residual nitrogen in the pressure stabilizing device are obtained through the weighing device, the flow of the nitrogen read from the flow meter component to be tested is converted into the weight W of the nitrogen, the difference value of W1, W2 and W3 is calculated according to W1, W2 and W3 to obtain the mass delta W of the nitrogen flowing through the flow meter component to be tested, and the error of the flow meter component to be tested is obtained by comparing W with delta W, so that the whole process of flow meter calibration is completed; through in certain check-up time, provide the environment of pressure stability, the discharge operating mode of flow relatively stable reduces the error of check-up, improves the check-up precision.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic diagram of an embodiment of a calibration apparatus for assembling a flowmeter assembly to be measured into a flowmeter according to the present invention;

FIG. 2 is a schematic structural diagram of a control device of a hardware operating environment according to the embodiment of FIG. 1;

fig. 3 is a schematic flowchart of a calibration method of a calibration apparatus of a flow meter according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Calibration device of flowmeter	33	First electric pressure gauge
1	Liquid nitrogen output device	4	Connecting pipeline
				11	Metering liquid nitrogen storage tank	5	Control device
12	Weighing machine	6	Branch pipeline
				13	Total liquid nitrogen storage tank	61	Drain valve
14	First liquid nitrogen pump	62	Drain stop valve
				15	Second liquid nitrogen pump	7	Check valve
2	Gasification device	8	Communication stop valve
				21	Electric heating gasifier	81	First stop valve
22	Power regulating circuit	200	Flowmeter subassembly that awaits measuring
				3	Voltage stabilizer	201	Flow meter
31	Pressure-stabilizing storage tank	202	Second electric dynamometer
				32	First regulating valve	203	Second regulating valve

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

One of the main contents of the safety valve type test is the discharge capacity test of the safety valve. The displacement test of safety valves generally uses a flow meter. To ensure the accuracy and traceability of the flow measurement, the flow meter used is required to be calibrated.

The current calibration technology is to perform geometric calibration on the flowmeter body, i.e. to verify the geometric dimension compliance. Disassembling a flow meter orifice plate or a throttling device to be verified, measuring the geometric dimension, and verifying the conformance of the flow meter orifice plate or the throttling device by comparing the geometric dimension of a piece to be tested with that of a standard piece; or a flowmeter with higher precision is compared with a flowmeter to be calibrated in series through a comparison method, the accuracy of flow measurement is related to the pressure drop in the flow process, the existing method only relates to the calibration of geometric dimensions, the flow of the fluid does not consider the situation that the standard requirements are not in accordance with the reality or the parameters of control components (a control valve, a valve connected with a container and the like) are different due to the difference of the process of each set of measuring device, and further the formed pressure drops are different to cause the inaccuracy of the verification result.

Referring to fig. 1, the present invention provides a calibration apparatus 100 for a flow meter, including a liquid nitrogen output device 1, a gasification device 2, a pressure stabilizer 3, a connecting pipeline 4 and a control device 5, where the liquid nitrogen output device 1 includes a metering liquid nitrogen storage tank 11 for outputting liquid nitrogen and a weighing device for weighing the metering liquid nitrogen storage tank 11; the input end of the gasification device 2 is connected to the metering liquid nitrogen storage tank 11, and the gasification device 2 is used for converting liquid nitrogen input by the input end into nitrogen; the input end of the pressure stabilizing device 3 is connected with the output end of the gasification device 2 so as to stabilize the pressure of the nitrogen gasified by the gasification device 2 and output the nitrogen; one end of the connecting pipeline 4 is connected with the pressure stabilizing device 3, and the other end of the connecting pipeline is used for being connected with the flowmeter assembly 200 to be tested; the control device 5 is electrically connected to the weighing device, the vaporizing device 2 and the pressure stabilizer 3, the control device 5 includes a memory, the memory stores a control program of the calibration device 100 of the flow meter, and the control program of the calibration device 100 of the flow meter is configured to implement the steps of the calibration method of the calibration device 100 of the flow meter provided by the invention.

In the technical scheme of the invention, liquid nitrogen is input into the metering liquid nitrogen storage tank 11, the weight W1 of the input liquid nitrogen is obtained through the weighing device, the input liquid nitrogen is converted into nitrogen through the gasification device 2, and then the nitrogen passes through the pressure stabilizing device 3, so that the pressure stabilizing device 3 outputs the nitrogen with stable air pressure to the flow meter component 200 to be measured; after a period of measurement on the flowmeter assembly 200 to be tested, obtaining the weight W2 of the remaining liquid nitrogen in the measurement liquid nitrogen storage tank 11, the weight W3 of the remaining nitrogen in the pressure stabilizer 3 through the weighing device, converting the nitrogen flow read from the flowmeter assembly 200 to be tested into the weight W of the nitrogen, calculating the difference between W1 and W2 and W3 according to W1, W2 and W3 to obtain the mass Δ W of the nitrogen flowing through the flowmeter assembly 200 to be tested, and comparing W with Δ W to obtain the error of the flowmeter assembly 200 to be tested, thereby completing the whole process of checking the flowmeter 201; through in certain check-up time, provide the environment of pressure stability, the discharge operating mode of flow relatively stable reduces the error of check-up, improves the check-up precision.

The control device 5 may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.

It will be appreciated by those skilled in the art that the configuration of the control device 5 shown in fig. 2 does not constitute a limitation of the control device 5 and may include more or less components than those shown, or some components in combination, or a different arrangement of components.

As shown in fig. 2, the memory 1005, which is a kind of computer storage medium, may include therein a control program of the calibration apparatus 100 of an operating system, a network communication module, a user interface module, and a flow meter.

In the control device 5 of the calibration device 100 for a flow meter shown in fig. 2, the network interface 1004 is mainly used for connecting to a server and performing data communication with the server; the user interface 1003 is mainly used for connecting a user terminal and performing data communication with the terminal; the control device 5 of the calibration device 100 for a flow meter according to the present invention calls the control method program of the calibration device 100 for a flow meter stored in the memory 1005 by the processor 1001, and executes the control method of the calibration device 100 for a flow meter according to the embodiment of the present invention.

In particular, due to the wide variety of types of the flowmeter assemblies 200 to be tested, wherein the nominal diameters of the flowmeters 201 are also different, in order to satisfy the versatility of the flowmeter calibration device 100, in this embodiment, the calibration apparatus 100 for a flow meter further includes a plurality of branch lines 6 connected in parallel, one end of each branch line 6 is connected to the pressure stabilizer 3, the other end is connected to the connecting line 4, each branch line 6 is provided with a drain valve 61 and a drain stop valve 62 connected in sequence, the flow channel diameters of the plurality of drain valves 61 are not limited in this application, some of the drain valves 61 on the branch lines 6 are set to different flow channel diameters, by selectively opening the corresponding drain cut-off valve 62, the flow path diameter of the drain valve 61 corresponding to the opened drain cut-off valve 62 is adjusted to be matched with the flow path diameter of the flow meter 201 in different flow meter assemblies 200 to be tested. Thus, the flowmeter calibration device 100 is versatile and has a wide range of applications.

Specifically, when the pressure of the drain valve 61 in the pipeline reaches a certain value, the drain valve 61 is opened, nitrogen is output towards the flowmeter assembly 200 to be checked, and the corresponding drain stop valve 62 is selectively opened to adjust the flow channel diameter of the drain valve 61 corresponding to the opened drain stop valve 62 to be matched with the flow channel diameter of the flowmeter 201 in different flowmeter assemblies 200 to be checked, so that the opening pressure of the drain valve 61, that is, the output pressure, is matched with the pressure value required by the flowmeter assembly 200 to be checked, and the checking accuracy is improved.

It should be noted that, in order to prevent the formation of a restriction, pressure fluctuations are caused; the diameter of the flow channel of the drain valve 61 corresponding to the opened drain stop valve 62 is not smaller than the diameter of the flow channel of the flow meter 201 in the flow meter assembly 200 to be tested, so that the throttling phenomenon can be avoided, the pressure is further stabilized, the drain stop valves 62 are connected to the output ends of the drain valves 61 in a one-to-one correspondence manner, on one hand, the diameter of the flow channel of the drain valve 61 is adjusted to be matched with the diameter of the flow channel of the flow meter 201 in different flow meter assemblies 200 to be tested by opening part of the drain stop valves 62, on the other hand, the rest drain stop valves 62 play a role in blocking, leakage caused by the fact that the corresponding drain valves 61 are not tightly sealed is avoided, and therefore the checking accuracy is improved.

Furthermore, in this embodiment, the output end of the pressure stabilizer 3 is connected to a first regulating valve 32, and the opening of the first regulating valve 32 is regulated, so that the nitrogen gas in the pressure stabilizer 3 is output at a pressure value required for checking by the flowmeter 201 to be measured, that is, a set pressure value set by the control device 5, it should be noted that the set pressure value may be set by a person skilled in the art according to different checking pressure values required by the flowmeter 201 to be measured, and is not limited herein; when the output pressure value of the pressure stabilizer 3 is smaller than the set pressure value, increasing the opening degree of the first regulating valve 32 to regulate the output pressure value of the first regulating valve 32 to reach the set pressure value; when the output pressure value of the pressure stabilizer 3 is greater than the set pressure value, reducing the opening degree of the first regulating valve 32 to regulate the output pressure value of the first regulating valve 32 to reach the set pressure value; it should be noted that the flow channel diameter of the first regulating valve 32 is greater than 5% to 15% of the flow channel diameter of the corresponding drain valve 61 of the corresponding open drain cut-off valve 62, and since the nitrogen gas at the set pressure value is output from the first regulating valve 32 to the corresponding branch line 6, in order to avoid the throttling phenomenon occurring in the corresponding branch line 6, the flow channel diameter of the first regulating valve 32 is required to be greater than 5% to 15% of the flow channel diameter of the corresponding drain valve 61 of the corresponding open drain cut-off valve 62, so as to avoid the pressure drop caused by the narrowing of the cross-sectional dimension, which leads to the unstable pressure, and to improve the stability of the output pressure of the gasification device 2, and at the same time, to ensure the stability of the branch line 6 corresponding to the nitrogen gas output at the set pressure value.

In addition, in the present invention, the pressure stabilizing device 3 includes a pressure stabilizing storage tank 31, the pressure stabilizing storage tank 31 is used for storing nitrogen gas with stable pressure, an output end of the gasification device 2 is connected to the pressure stabilizing storage tank 31, an output end of the pressure stabilizing storage tank 31 is connected to a first stop valve 81 and the first regulating valve 32, which are sequentially connected, and a pressure value in the pressure stabilizing storage tank 31 reaches a base pressure value, it should be noted that the base pressure value is set by a person skilled in the art according to different flow channel diameters of the flowmeter assembly 200 to be measured, and is not limited herein; the first stop valve 81 is opened when the pressure value in the pressure stabilizing storage tank 31 reaches the basic pressure value, and then the output pressure value of the pressure stabilizing storage tank 31 is adjusted to be the set pressure value through the first regulating valve 32; wherein, in order to ensure that the nitrogen gas with the set pressure value is continuously output from the pressure stabilizing storage tank 31, the base pressure value is not less than the set pressure value. So set up, improve stability, reduce the pressure fluctuation.

It should be noted that, a first voltage force meter 33 is connected to the regulated storage tank 31, the first voltage force meter 33 is an electric contact pressure meter and is electrically connected to the control device 5, and by comparing the first voltage force meter 33 with a set pressure value, the control device 5 controls the opening of the first regulating valve 32 to make the output pressure value be the set pressure value.

In this embodiment, the liquid nitrogen output device 1 further includes a total liquid nitrogen storage tank 13, an output end of the total liquid nitrogen storage tank 13 is connected to the measurement liquid nitrogen storage tank 11, a first liquid nitrogen pump 14 is arranged between the measurement liquid nitrogen storage tank 11 and the total liquid nitrogen storage tank 13, a certain weight of liquid nitrogen is input to the measurement liquid nitrogen storage tank 11 from the total liquid nitrogen storage tank 13 through the first liquid nitrogen pump 14, and then an input initial liquid nitrogen weight W1 is obtained by a weighing device 12 located at a lower end of the measurement liquid nitrogen storage tank 11.

It should be noted that, the present application does not limit the structures of the total liquid nitrogen storage tank 13 and the measurement liquid nitrogen storage tank 11, as long as the total liquid nitrogen storage tank 13 and the measurement liquid nitrogen storage tank 11 can store the liquid nitrogen, in this embodiment, the total liquid nitrogen storage tank 13 is a vertical liquid nitrogen storage tank, the measurement liquid nitrogen storage tank 11 is a horizontal liquid nitrogen storage tank, and the measurement liquid nitrogen storage tank 11 is placed on the upper surface of the weighing device 12, so that the connection between the total liquid nitrogen storage tank 13 and the measurement liquid nitrogen storage tank 11 and the transportation of the liquid nitrogen are facilitated.

In addition, in the present invention, the gasification device 2, the pressure stabilizing storage tank 31, the plurality of branch pipelines 6, and the flow meter assembly 200 to be tested are provided with a communication stop valve 8 between two adjacent devices for communication and stop between the pipelines; wherein the communication shutoff valve 8 located between the surge tank 31 and the plurality of branch lines 6 is the first shutoff valve 81.

The invention also provides a flowmeter assembly 200 to be tested, wherein the flowmeter assembly 200 to be tested is used in the calibrating device 100 of the flowmeter; because the configured accessories in the calibration device 100 of the flowmeter are different, the accessories refer to control valves, valves connected with a container and the like, and the formed pressure drop is different, the final checking result may be affected, the flowmeter assembly 200 to be tested provided by the invention comprises a plurality of accessories and a flowmeter 201, wherein the accessories are connected to the connecting pipeline 4 and comprise a second regulating valve 203, a fluid director and a second stop valve which are sequentially connected; the flow meter 201 is located between the flow director and the second stop valve; through will flowmeter 201 with a plurality of annex forms the flowmeter subassembly 200 that awaits measuring, will be a plurality of the annex with flowmeter 201 checks together, guarantees that the pressure drop at every turn is unanimous to reduce the error, improve the precision.

It should be noted that the flowmeter assembly 200 to be measured further includes a second voltage force meter 202, the second voltage force meter 202 is set as a pressure sensor, and the controller indicates the opening degree of the second regulating valve 203 to make the pressure value input by the flowmeter assembly 200 to be measured be a set pressure value through the pressure signal collected by the pressure sensor.

In the embodiment, a check valve 7 is further arranged between the pressure-stabilizing storage tank 31 and the gasification device 2, the nitrogen can only be input into the pressure-stabilizing storage tank 31 from the gasification device 2, but can not flow back into the gasification device 2 from the pressure-stabilizing storage tank 31, so that the nitrogen in the pressure-stabilizing storage tank 31 is prevented from flowing back into the gasification device 2 to cause pressure fluctuation; so configured, the pressure upstream of the calibration device 100 of the flow meter is guaranteed to be stable.

Based on the above hardware structure, the present invention provides a calibration method of a calibration apparatus 100 of a flow meter, please refer to fig. 3, and fig. 3 is a schematic flowchart of an embodiment of the calibration method of the calibration apparatus 100 of the flow meter provided in this embodiment.

S10: acquiring the initial liquid nitrogen weight W1 of the metering liquid nitrogen storage tank 11 metered by the weighing device;

in this embodiment, the liquid nitrogen output device 1 further includes a total liquid nitrogen storage tank 13, an output end of the total liquid nitrogen storage tank 13 is connected to the measurement liquid nitrogen storage tank 11, a first liquid nitrogen pump 14 is arranged between the measurement liquid nitrogen storage tank 11 and the total liquid nitrogen storage tank 13, a certain weight of liquid nitrogen is input to the measurement liquid nitrogen storage tank 11 from the total liquid nitrogen storage tank 13 through the first liquid nitrogen pump 14, and then an input initial liquid nitrogen weight W1 is obtained by a weighing device 12 located at a lower end of the measurement liquid nitrogen storage tank 11.

S20: after the flowmeter assembly 200 to be measured is measured, acquiring the weight W2 of the liquid nitrogen of the measured liquid nitrogen storage tank 11 and the weight W3 of the nitrogen in the pressure stabilizer 3, and converting the nitrogen flow value read from the flowmeter assembly 200 to be measured into the weight W of the nitrogen;

in this embodiment, after the test is completed within a period of time, the period of time here may refer to that a person skilled in the art can perform different settings on different flow meter assemblies 200 to be tested, and is not limited herein; closing the first regulating valve 32 and the first stop valve 81, closing the gasification device 2, obtaining the weight W2 of the liquid nitrogen remaining in the metering liquid nitrogen storage tank 11 through a weigher 12, and obtaining the gas with a certain pressure remaining in the pressure stabilizing storage tank 31, converting the weight W3 of the nitrogen gas remaining in the pressure stabilizing storage tank 31, and converting the nitrogen gas flow rate read by the flow meter 201 in the flow meter assembly 200 to be tested into the weight W of the nitrogen gas.

S30: calculating difference values according to W1, W2 and W3 to obtain the mass delta W of nitrogen flowing through the flowmeter assembly 200 to be tested;

and subtracting W2 and W3 from the W1 to obtain the mass delta W of the nitrogen flowing through the flowmeter assembly 200 to be tested.

S40: and comparing W with the delta W to obtain the error of the flowmeter assembly 200 to be measured.

Subtracting W2 and W3 from W1 to obtain the mass Δ W of nitrogen flowing through the flowmeter assembly 200 to be measured, comparing the mass Δ W with the weight W of nitrogen converted from the nitrogen flow read by the flowmeter 201 in the flowmeter assembly 200 to be measured, converting fluid into mass and comparing, wherein the Δ W obtained by the calibration method of the flowmeter calibration device 100 is more accurate due to the law of conservation of mass, and comparing Δ W with W to obtain a difference value, so that the calibration of the flowmeter 201 can be completed.

In order to convert the liquid nitrogen input to the measured liquid nitrogen storage tank 11 into nitrogen gas, the vaporizing device 2 includes an electrically heated vaporizer 21, an input terminal of the electrically heated vaporizer 21 is connected to the measured liquid nitrogen storage tank 11, an output terminal of the electrically heated vaporizer 21 is connected to an input terminal of the pressure stabilizing device 3, and the step S10 includes:

s11: controlling the electric heating vaporizer 21 to work, converting the liquid nitrogen input from the input end into nitrogen, and outputting the nitrogen from the output end of the electric heating vaporizer 21 to the pressure stabilizing device 3;

in this embodiment, the gasification device 2 includes an electric heating vaporizer 21, the electric heating vaporizer 21 is connected between the regulated pressure tank 31 and the measured liquid nitrogen tank 11, a second liquid nitrogen pump 15 is connected between the measured liquid nitrogen tank 11 and the electric heating vaporizer 21, the second liquid nitrogen pump 15 outputs liquid nitrogen from the measured liquid nitrogen tank 11 to the electric heating vaporizer 21, so as to convert the input liquid nitrogen into nitrogen, since the volume of the regulated pressure tank 31 is limited, the verification time needs to be long enough, the electric heating vaporizer 21 outputs nitrogen while inputting nitrogen, so as to ensure that nitrogen is continuously input into the regulated pressure tank 31, and ensure that enough nitrogen is present to maintain the pressure in the regulated pressure tank 31 stable; so, convenient regulation, it is nimble to use.

In order to output the nitrogen gas output from the electric heating vaporizer 21 as the nitrogen gas at the set pressure value via the surge tank 31, the step S11 is followed by:

s12: when the pressure value in the pressure stabilizing device 3 reaches a set basic pressure value, controlling the stop valve to open;

the opening degree of the first regulating valve 32 is controlled so that the pressure stabilizer 3 outputs the set pressure value.

In this embodiment, a first stop valve 81 and a first regulating valve 32 are sequentially connected to an output end of the pressure stabilizer 3, the first stop valve 81 is opened when the pressure value in the pressure stabilizer tank 31 reaches a basic pressure value, the opening degree of the first regulating valve 32 is increased by regulating the opening degree of the first regulating valve 32 when the output pressure value of the pressure stabilizer 3 is smaller than the set pressure value, and the opening degree of the first regulating valve 32 is decreased when the output pressure value of the pressure stabilizer 3 is larger than the set pressure value; so as to output the nitrogen gas in the pressure stabilizer 3 at the pressure value required for checking by the flowmeter 201 to be tested, namely the set pressure value set by the control device 5; wherein, in order to ensure that the nitrogen gas with the set pressure value is continuously output from the pressure stabilizing storage tank 31, the base pressure value is not less than the set pressure value. With the arrangement, the first regulating valve 32 can be regulated while inputting nitrogen into the pressure stabilizing storage tank 31 while the electric heating vaporizer 21 operates, so that the pressure of the nitrogen in the pressure stabilizing storage tank 31 and the output pressure are kept stable, the working efficiency is improved, and the pressure fluctuation is reduced.

In order to further keep the pressure of the surge tank 31 stable, the step S11 includes:

s111: when the nitrogen in the pressure stabilizing device 3 is smaller than a set basic pressure value, controlling the power regulating circuit 22 to increase the power of the electric heating vaporizer 21;

when the nitrogen gas in the pressure stabilizing device 3 is larger than the set basic pressure value, the power regulating circuit 22 is controlled to reduce the power of the electric heating vaporizer 21.

In the present embodiment, the electrical heating vaporizer 21 includes a power regulating circuit 22, the power regulating circuit 22 is electrically connected to the control device 5, and the electrical heating vaporizer 21 is first set to an output pressure value, which is generally set by a person skilled in the art, for example, if it is necessary to prepare for the calibration of the flow meter 201 at 1.0Mpa, the corresponding output pressure value is first set to 2.0Mpa in the control device 5. The Δ P is set to 1Mpa according to the prior experience, if the power of the electric heating vaporizer is large enough or the volume of the pressure-stabilizing storage tank 31 is large enough, the Δ P can be small, and there is no limitation here, when the pressure of the electric heating vaporizer 21 input into the pressure-stabilizing storage tank 31 is higher than the output pressure value, the control device 5 controls the power regulating circuit 22 to reduce the current input, reduce the power, thereby reducing the vaporization amount of the liquid nitrogen, and ensuring the stability of the pressure-stabilizing storage tank 31, and similarly, when the pressure of the electric heating vaporizer 21 input into the pressure-stabilizing storage tank 31 is lower than the output pressure value, the control device 5 controls the power regulating circuit 22 to increase the current input, increase the power, thereby increasing the vaporization amount of the liquid nitrogen, and ensuring the stability of the pressure-stabilizing storage tank 31; the stability is improved, and meanwhile, the automation of pressure adjustment is realized.

In order to weigh the liquid nitrogen input into the metered liquid nitrogen storage tank 11, the step S10 includes:

s13: inputting liquid nitrogen from the total liquid nitrogen storage tank 13 to the metering liquid nitrogen storage tank 11, and controlling the weighing device 12 to acquire the weight W1 of the initial liquid nitrogen input to the metering liquid nitrogen storage tank 11.

Through first hydraulic pump will certain weight liquid nitrogen follow total liquid nitrogen storage tank 13 in input to measurement liquid nitrogen storage tank 11, the lower extreme of measurement liquid nitrogen storage tank 11 is equipped with weighing device 12, weighing device 12 acquires the initial liquid nitrogen weight W1 of input, so sets up, through first liquid nitrogen pump 14 is followed export the different grade type in total liquid nitrogen storage tank 13 the required liquid nitrogen weight of the flowmeter subassembly 200 check-up that awaits measuring, the commonality is good, and application range is wide.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.