A cryogenic liquid flowmeter calibration method, apparatus, device, medium, and product

Abstract

The application discloses a low-temperature liquid flowmeter calibration method, device, equipment, medium and product, relates to the technical field of calibration, and aims to solve the problems of low efficiency and accuracy when calibrating the flowmeter. The low-temperature liquid flowmeter calibration method is applied to a control equipment in a low-temperature liquid flowmeter calibration system; the low-temperature liquid flowmeter calibration system further comprises a first acquisition equipment, a standard meter, a second acquisition equipment and a temperature transmitter; the low-temperature liquid flowmeter calibration method comprises the following steps: in the case that second flow information and fluid temperature meet calibration conditions, a plurality of groups of cumulative mass flow rates are acquired; one group of cumulative mass flow rates comprises one first flow information and one second flow information measured in the same acquisition period; different groups of cumulative mass flow rates correspond to different mass flow points; according to the plurality of groups of cumulative mass flow rates, error values corresponding to each mass flow point of a to-be-calibrated flowmeter are determined, so that the to-be-calibrated flowmeter is calibrated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of calibration, in particular to a low-temperature liquid flowmeter calibration method, device, equipment, medium and product. BACKGROUND

[0002] In fluid production and transportation scenarios such as tank cars or factories, flowmeters are usually installed to measure the mass flow of fluids. In order to make the flowmeter have stable accuracy, the flowmeter needs to be calibrated. In related manners, the flowmeter is usually disassembled from the production and transportation scenario and sent to a related laboratory for calibration. This method not only takes a long time, but also the calibration medium used in the laboratory may be inconsistent with the medium actually used on site, which may cause large calibration result errors and low accuracy. SUMMARY

[0003] The purpose of the present application is to provide a low-temperature liquid flowmeter calibration method, device, equipment, medium and product, aiming to solve the problems of low efficiency and accuracy when calibrating the flowmeter.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] In the first aspect, the present application provides a low-temperature liquid flowmeter calibration method applied to a control device in a low-temperature liquid flowmeter calibration system. The low-temperature liquid flowmeter calibration system further includes a first acquisition device, a standard meter, a second acquisition device, and a temperature transmitter. The control device is connected to the first acquisition device and the second acquisition device. The standard meter is connected in series with the flowmeter to be calibrated and a fluid device when in operation. The fluid device is a device through which the fluid flows or flows out in the actual working scenario of the flowmeter to be calibrated. The first acquisition device is used to acquire first flow information measured by the flowmeter to be calibrated. The second acquisition device is used to acquire second flow information measured by the standard meter. The temperature transmitter is used to measure the temperature of the fluid flowing through the standard meter.

[0006] The low-temperature liquid flowmeter calibration method includes: acquiring a plurality of sets of cumulative mass flow under the condition that the second flow information and the fluid temperature meet the calibration condition. The calibration condition is used to limit the mass flow point at which the second flow information is located when calibration starts, and the temperature interval at which the fluid temperature is located when calibration starts. One set of cumulative mass flow includes one first flow information and one second flow information measured in the same acquisition period. Different sets of cumulative mass flow correspond to different mass flow points. According to the plurality of sets of cumulative mass flow, the error value of the flowmeter to be calibrated corresponding to each mass flow point is determined to calibrate the flowmeter to be calibrated.

[0007] Based on this, the application can support calibration of the to-be-calibrated flowmeter in the actual working scene of the to-be-calibrated flowmeter, avoiding the problem of long time consumption caused by disassembly and calibration of the to-be-calibrated flowmeter, and the problem of large calibration result error caused by the inconsistency between the calibration medium used in the laboratory and the medium actually used in the field. In this way, the control device can acquire multiple sets of cumulative mass flow under the condition that the second flow information and the fluid temperature meet the calibration condition, so that the data for calibration are more consistent with the actual working condition of the to-be-calibrated flowmeter, and the accuracy of calibration is improved.

[0008] In addition, considering that the to-be-calibrated flowmeter may have different measurement errors at different mass flow points, the application can support acquisition of multiple sets of cumulative mass flow at different mass flow points, and then determine error values corresponding to the to-be-calibrated flowmeter at different mass flow points, for accurate calibration of the to-be-calibrated flowmeter.

[0009] In some embodiments, the method of acquiring multiple sets of cumulative mass flow specifically comprises: determining a starting mass flow based on a starting image, and determining a terminal mass flow based on a terminal image. The starting image is an image acquired by the first acquisition device at the beginning of one acquisition period. The terminal image is an image acquired by the first acquisition device at the end of one acquisition period. The difference between the terminal mass flow and the starting mass flow is determined as the first flow information.

[0010] In some embodiments, the method of acquiring multiple sets of cumulative mass flow specifically comprises: determining the quotient of the standard table pulse number and the standard table pulse coefficient as the second flow information. The standard table pulse number is the pulse number measured by the standard table acquired by the second acquisition device within one acquisition period.

[0011] In some embodiments, the method further comprises: adjusting the second flow information according to the fluid temperature and the fluid pressure. The fluid pressure is the pressure of the fluid flowing through the standard table.

[0012] In some embodiments, the method of determining error values corresponding to the to-be-calibrated flowmeter at each mass flow point based on the multiple sets of cumulative mass flow specifically comprises: determining the error value corresponding to one set of cumulative mass flow as the ratio of the difference between the second flow information and the first flow information in the set of cumulative mass flow to the first flow information in the set of cumulative mass flow, to obtain the error values corresponding to the to-be-calibrated flowmeter at each mass flow point.

[0013] In some embodiments, the fluid comprises a liquid with a boiling point lower than -153°C at normal pressure.

[0014] In a second aspect, the embodiments of the present application provide a low-temperature liquid flowmeter calibration device, which is applied to a control device in a low-temperature liquid flowmeter calibration system. The low-temperature liquid flowmeter calibration system further comprises a first acquisition device, a standard meter, a second acquisition device, and a temperature transmitter. The control device is connected to the first acquisition device and the second acquisition device. The standard meter is connected in series with a flowmeter to be calibrated and a fluid device in operation. The fluid device is a device through which fluid flows in or out in an actual working scene of the flowmeter to be calibrated. The first acquisition device is configured to acquire first flow information measured by the flowmeter to be calibrated. The second acquisition device is configured to acquire second flow information measured by the standard meter. The temperature transmitter is configured to measure the temperature of fluid flowing through the standard meter.

[0015] The low-temperature liquid flowmeter calibration device comprises an acquisition unit and a processing unit. The acquisition unit is configured to acquire a plurality of sets of cumulative mass flow rates when the second flow information and the temperature of the fluid meet a calibration condition. The calibration condition is used to limit the mass flow rate point at which the second flow information is located when calibration starts and the temperature range in which the temperature of the fluid is located when calibration starts. One set of cumulative mass flow rates comprises one first flow information and one second flow information measured in the same acquisition period. Different sets of cumulative mass flow rates correspond to different mass flow rate points.

[0016] The processing unit is configured to determine an error value of the flowmeter to be calibrated at each mass flow rate point according to the plurality of sets of cumulative mass flow rates, so as to calibrate the flowmeter to be calibrated.

[0017] In some embodiments, the acquisition unit is specifically configured to determine a starting mass flow rate based on a starting image and determine a terminal mass flow rate based on a terminal image. The starting image is an image acquired by the first acquisition device at a starting time of an acquisition period. The terminal image is an image acquired by the first acquisition device at an ending time of the acquisition period. A difference between the terminal mass flow rate and the starting mass flow rate is determined as the first flow information.

[0018] In some embodiments, the acquisition unit is specifically configured to determine a quotient of a number of pulses of the standard meter divided by a pulse coefficient of the standard meter as the second flow information. The number of pulses of the standard meter is a number of pulses measured by the standard meter and acquired by the second acquisition device in an acquisition period.

[0019] In some embodiments, the processing unit is further configured to adjust the second flow information according to the temperature of the fluid and a fluid pressure. The fluid pressure is a pressure of the fluid flowing through the standard meter.

[0020] In some embodiments, the processing unit is specifically configured to: determine, as an error value corresponding to the set of cumulative mass flow rates, a ratio of a difference between the second flow information and the first flow information in the set of cumulative mass flow rates and the first flow information in the set of cumulative mass flow rates.

[0021] In some embodiments, the fluid includes a liquid having a boiling point lower than -153°C at normal pressure.

[0022] In a third aspect, the embodiments of the present application provide a computer device, comprising: a processor, the processor being connected with a memory, the memory being used to store computer execution instructions, and the processor executing the computer execution instructions stored in the memory to enable the computer device to execute the low-temperature liquid flow meter calibration method according to any one of the first aspect.

[0023] In a fourth aspect, the embodiments of the present application provide a computer readable storage medium, used to store computer execution instructions, when the computer execution instructions are run on a computer device, the computer execution instructions enable the computer device to execute the low-temperature liquid flow meter calibration method according to any one of the first aspect.

[0024] In a fifth aspect, the embodiments of the present application provide a computer program product, comprising computer execution instructions, when the computer execution instructions are run on a computer device, the computer execution instructions enable the computer device to execute the low-temperature liquid flow meter calibration method according to any one of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 A structural schematic diagram of a low-temperature liquid flow meter calibration system provided by the embodiments of the present application is shown in FIG. 1.

[0027] Figure 2 A structural schematic diagram of another low-temperature liquid flow meter calibration system provided by the embodiments of the present application is shown in FIG. 2.

[0028] Figure 3 A structural schematic diagram of a control device provided by the embodiments of the present application is shown in FIG. 3.

[0029] Figure 4 A flowchart of a low-temperature liquid flow meter calibration method provided by the embodiments of the present application is shown in FIG. 4.

[0030] Figure 5A structural schematic diagram of a low-temperature liquid flowmeter calibration device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified, the above directional description can be flexibly arranged in the process of actual application, as long as the relative positional relationship shown in the drawings is met.

[0033] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "communication" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be directly connected, or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the embodiments of the present application, the terms "including", "containing" or any other variants thereof are intended to cover non-exclusive containing, so that the process, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, article or device. Without more limitation, the element defined by the sentence "including a" does not exclude the existence of other identical elements in the process, article or device including the element.

[0036] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the embodied words are used to present concepts in a particular, concrete form that is easier to understand.

[0037] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0038] Firstly, the application scenario involved in the present application is briefly introduced.

[0039] In the fluid production and transportation scene of tank trucks or factories, etc., a flowmeter for measuring the mass flow of fluid is usually installed. In order to make the flowmeter have stable accuracy, the flowmeter needs to be calibrated. In related modes, the flowmeter is usually disassembled from the production and transportation scene and sent to a related laboratory for calibration. This disassembly and calibration mode not only takes a long time, but also the calibration medium used in the laboratory may be inconsistent with the medium actually used on site, which may cause large calibration result error and low accuracy, and at the same time easily affect the production and transportation work of the fluid, resulting in high calibration cost.

[0040] In addition, this disassembly and calibration mode can only obtain the basic error of the flowmeter, and it is difficult to obtain the additional error in the fluid production and transportation scene. For example, for a tank truck that needs to transport low-temperature liquid, this calibration mode is easy to ignore the error caused by the difference between the temperature of the liquid in the tank truck filling and unloading process and the temperature of the liquid used in the laboratory calibration, and cannot meet the calibration needs of the low-temperature liquid metering flowmeter for the tank truck filling and unloading.

[0041] Next, the implementation environment (implementation architecture) involved in the present application is briefly introduced.

[0042] As shown in Figure 1 Fig. 1 is a structural schematic diagram of a low-temperature liquid flowmeter calibration system provided by an embodiment of the present application. The low-temperature liquid flowmeter calibration system can include a control device 101, a standard meter 102, a first acquisition device 103, a second acquisition device 104, and a temperature transmitter 105. The control device 101 is connected with the first acquisition device 103, the second acquisition device 104, and the temperature transmitter 105, respectively.

[0043] The standard meter 102 is connected in series with a flowmeter 106 to be calibrated and a fluid device 107 when working. The standard meter 102 can be a DN50 high-precision mass flowmeter.

[0044] Optionally, the fluid device 107 is a device through which the fluid flows or from which the fluid flows in the actual working scenario of the flowmeter 106 to be calibrated. For example, the fluid device 107 can be a tank through which the fluid flows. For another example, the fluid device 107 can be a liquid source from which the fluid flows. The fluid can include a liquid having a boiling point lower than -153°C at normal pressure.

[0045] The first acquisition device 103 is configured to acquire first flow information measured by the flowmeter 106 to be calibrated. For example, in a case where the flowmeter 106 to be calibrated has a display module and can display the measured cumulative mass flow through the display module, the first acquisition device 103 can be a camera device configured to acquire image information of the display module. In this way, the control device 101 can determine the cumulative mass flow measured by the flowmeter 106 to be calibrated based on the image information acquired by the first acquisition device 103. For another example, in a case where the flowmeter 106 to be calibrated is configured to measure the number of pulses of the fluid, the first acquisition device 103 can be a frequency counter configured to acquire the number of pulses measured by the flowmeter 106 to be calibrated. In this way, the control device 101 can determine the cumulative mass flow measured by the flowmeter 106 to be calibrated based on the number of pulses acquired by the first acquisition device 103 and a pulse coefficient.

[0046] Alternatively, the first acquisition device 103 can be a frequency counter configured to acquire the number of pulses measured by the flowmeter 106 to be calibrated. The control device 101 is further configured to determine the first flow information corresponding to the flowmeter 106 to be calibrated according to the number of pulses and a pulse coefficient of the flowmeter 106 to be calibrated.

[0047] The second acquisition device 104 is configured to acquire second flow information measured by the standard meter 102. For example, the standard meter 102 can be configured to measure the number of pulses of the fluid, and the second acquisition device 104 can be a frequency counter configured to acquire the number of pulses measured by the standard meter 102. In this way, the control device 101 can determine the cumulative mass flow measured by the standard meter 102 based on the number of pulses acquired by the second acquisition device 104 and a pulse coefficient.

[0048] The temperature transmitter 105 is configured to measure the temperature of the fluid flowing through the standard meter 102 and send the measured temperature of the fluid to the control device 101.

[0049] The control device 101 can control the working states of the first collection device 103 and the second collection device 104 according to the fluid temperature. For example, the control device 101 can control the working states of the first collection device 103 and the second collection device 104 to be the open state when the fluid temperature is in the temperature interval corresponding to the start of calibration. For another example, the control device 101 can control the working states of the first collection device 103 and the second collection device 104 to be the closed state when the fluid temperature is not in the temperature interval corresponding to the start of calibration. Further, the control device 101 can determine the error value corresponding to the to-be-calibrated flow meter 106 according to the first flow information and the second flow information.

[0050] The control device 101 is further configured to control the working states of the first collection device 103 and the second collection device 104 to be the open state in a plurality of preset flow intervals. The plurality of preset flow intervals include 20%Q-50%Q and 50%Q-100%Q. Q is the maximum mass flow during calibration.

[0051] Further, the control device 101 can obtain a plurality of sets of cumulative mass flow when the second flow information and the fluid temperature meet the calibration condition, to further determine the error value for calibrating the to-be-calibrated flow meter.

[0052] Based on this, the present application can support calibration of the to-be-calibrated flow meter 106 in the actual working scenario of the to-be-calibrated flow meter 106, avoid the problem of long time consumption and large error of calibration results caused by disassembly and calibration of the to-be-calibrated flow meter 106, make the calibrated data more consistent with the actual working condition of the to-be-calibrated flow meter 106, and improve the accuracy of calibration.

[0053] In combination with Figure 1 FIG. 1 shows a low-temperature liquid flow meter calibration system provided by an embodiment of the present application. Figure 2 FIG. 2 shows a structure schematic diagram of another low-temperature liquid flow meter calibration system provided by an embodiment of the present application. Figure 2 The low-temperature liquid flow meter calibration system shown in FIG. 1 includes a control device 101, a standard meter 102, a first collection device 103, a second collection device 104, a temperature transmitter 105, a pressure transmitter 108, a vent valve 111, and a safety valve 112.

[0054] The pressure transmitter 108 is configured to measure the fluid pressure. The control device 101 is further configured to adjust the second flow information of the standard meter 102 according to the fluid temperature and the fluid pressure.

[0055] In Figure 2 , the fluid device 107 can be a storage tank 110. The standard meter 102 is provided with quick connectors at two ends, and is connected to the to-be-calibrated flow meter 106 and the storage tank 110 through the quick connectors respectively.

[0056] The vent valve 111 is arranged in the fluid pipeline at the output end of the standard table 102, and can vent the fluid in the system under certain conditions.

[0057] The safety valve 112 is arranged in the fluid pipeline at the input end of the standard table 102, and is composed of a valve clack, a spring (or a weight loading device), a valve seat, etc. Under normal circumstances, the safety valve 112 is in a closed state, and the fluid pressure in the pipeline is within the allowable range. When the fluid pressure in the pipeline exceeds the allowable range, the fluid can be discharged through the safety valve 112, so as to reduce the fluid pressure.

[0058] In hardware implementation, the control device can be implemented through a structure as shown in Figure 3 FIG. 1 is a structural schematic diagram of a control device provided by an embodiment of the present application. Figure 3 Figure 3 The control device can include a processor 201, a memory 202, a communication interface 203 and a bus 204. The processor 201, the memory 202 and the communication interface 203 can be connected through the bus 204.

[0059] The processor 201 is the control center of the control device, and can be a general-purpose central processing unit (CPU), or other general-purpose processors, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0060] As an example, the processor 201 can include one or more CPUs, such as the CPU 0 and the CPU 1 as shown in Figure 3

[0061] The memory 202 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a magnetic disk storage medium or other magnetic storage devices, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0062] ​​In a possible implementation, the memory 202 can exist independently of the processor 201. The memory 202 can be connected to the processor 201 through the bus 204, for storing data, instructions or program codes. When the processor 201 invokes and executes the instructions or program codes stored in the memory 202, the identification of the to-be-identified object can be implemented.

[0063] In another possible implementation, the memory 202 can also be integrated with the processor 201.

[0064] The communication interface 203 is configured to control the device to be connected to other devices through a communication network, which can be an Ethernet, a radio access network (RAN), a wireless local area network (WLAN) or the like. The communication interface 203 can include a receiving unit configured to receive data, and a sending unit configured to send data.

[0065] The bus 204 can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus or the like. The bus can be divided into an address bus, a data bus, a control bus and the like. For the convenience of representation, Figure 3 In the drawings, only one thick line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0066] It should be noted that Figure 3 The structure shown in the drawings does not constitute a limitation on the control device, except Figure 3 The control device can include more or fewer components than those shown in the drawings, or combine some components, or different arrangement of components.

[0067] For the convenience of understanding, the low-temperature liquid flowmeter calibration method provided in the present application will be specifically introduced below in combination with the drawings.

[0068] As Figure 4 shown, it is a flowchart of a low-temperature liquid flowmeter calibration method provided in the present application. Figure 4 The low-temperature liquid flowmeter calibration method shown can be applied to the control device in the low-temperature liquid flowmeter calibration system shown in any of the above Figures 1 to 3 The method includes S301-S302.

[0069] S301, in the case that the second flow information and the fluid temperature meet the calibration condition, obtaining a plurality of sets of cumulative mass flow rates.

[0070] The calibration condition is used to limit the mass flow rate point at which the calibration is started and the temperature range of the fluid temperature at which the calibration is started.

[0071] Considering that the to-be-calibrated flowmeter may have different measurement errors at different mass flow rate points, data collection can be performed at different mass flow rate points. In this way, one set of cumulative mass flow rates includes one first flow information and one second flow information measured in the same collection period. The first flow information is the cumulative mass flow rate flowing through the to-be-calibrated flowmeter in one collection period. The second flow information is the cumulative mass flow rate flowing through the standard meter in one collection period. Different sets of cumulative mass flow rates correspond to different mass flow rate points.

[0072] For example, considering that the instantaneous mass flow rate change value of the low-temperature liquid metering flowmeter during filling is small, data collection can be performed in two flow rate ranges of 20%Q-50%Q and 50%Q-100%Q. Q is the maximum mass flow rate that can be filled during calibration. Alternatively, the number of calibration tests in each flow rate range can be not less than 3, and the duration of a single measurement can be greater than 1 minute. In this way, the to-be-calibrated flowmeter can be calibrated at different mass flow rate points in the two flow rate ranges.

[0073] It should be noted that before calibrating the to-be-calibrated flowmeter, the to-be-calibrated flowmeter can be checked for appearance, nameplate, and normal operation. If the to-be-calibrated flowmeter is in good condition, there is no mechanical damage that affects normal operation, the switches and keys are firm and function normally, and the display screen can display normally.

[0074] In addition, after connecting the to-be-calibrated flowmeter to the low-temperature liquid flowmeter calibration system and checking that there is no abnormality at each connection of the pipeline system, in order to improve the accuracy of calibration, the to-be-calibrated flowmeter and the standard meter can be powered and preheated, and the preheating time should be not less than 30 minutes.

[0075] At the same time, considering that the fluid can be a low-temperature liquid, i.e., a fluid medium with a boiling point below -153℃ (120K) at normal pressure, such as liquefied natural gas, liquid nitrogen, liquid hydrogen, liquid oxygen, liquid helium, etc., a low-temperature fluid source can be started to fill the low-temperature fluid to precool the to-be-calibrated flowmeter.

[0076] In this case, the control device can collect the mass flow measured by the standard meter through the second collection device, and the circulating flow time of the maximum mass flow of the low-temperature fluid of the standard meter of more than 50% should be no less than 5 minutes, so as to complete the pre-cooling of the flow meter to be calibrated. During the process, the low-temperature fluid can flow through the flow meter to be calibrated and the standard meter in turn, and is filled into the low-temperature fluid storage tank. During the process, the mass flow of the low-temperature fluid filling can be adjusted based on the mass flow measured by the standard meter, by adjusting the stop valve in the low-temperature fluid source or the motor frequency of the low-temperature submerged pump, reducing the pressure of the low-temperature fluid storage tank, and the like.

[0077] The control device can determine whether to start data collection based on the mass flow of the standard meter (i.e., the second flow information) and the fluid temperature collected by the temperature transmitter. If the mass flow of the low-temperature fluid meets the mass flow point at the start of calibration, and the fluid temperature of the low-temperature fluid meets the temperature interval at the start of calibration, it is determined to start calibration, and the first flow information of the flow meter to be calibrated is collected through the first collection device, and the second flow information of the standard meter is collected through the second collection device.

[0078] S302, according to the plurality of sets of cumulative mass flow, determine the error value corresponding to each mass flow point of the flow meter to be calibrated, for calibrating the flow meter to be calibrated.

[0079] For a set of cumulative mass flow, the control device can determine the error value of the mass flow point corresponding to the set of cumulative mass flow by comparing the difference between the second flow information and the first flow information with the first flow information in the same set of cumulative mass flow, i.e., the difference between the cumulative mass flow collected by the standard meter and the cumulative mass flow collected by the flow meter to be calibrated, and the ratio of the difference to the cumulative mass flow collected by the flow meter to be calibrated. calibrated.

[0080] Alternatively, after the control device determines the cumulative mass flow collected by the flow meter to be calibrated and the cumulative mass flow collected by the standard meter, it can also correct the cumulative mass flow collected by the standard meter based on the fluid temperature collected by the temperature transmitter, and further determine the error value of the mass flow point corresponding to the set of cumulative mass flow by comparing the difference between the corrected cumulative mass flow collected by the standard meter and the cumulative mass flow collected by the flow meter to be calibrated, and the ratio of the difference to the cumulative mass flow collected by the flow meter to be calibrated.

[0081] Based on this, the application can support calibration of the to-be-calibrated flowmeter in the actual working scene of the to-be-calibrated flowmeter, avoid the problem of long time consumption caused by disassembly and calibration of the to-be-calibrated flowmeter, and the problem of large calibration result error caused by the inconsistency between the calibration medium used in the laboratory and the medium actually used in the field. Moreover, using in-situ online calibration to replace traditional offline laboratory calibration can reduce additional error caused by offline verification. In this way, the control device can acquire multiple sets of cumulative mass flow under the condition that the second flow information and the fluid temperature meet the calibration condition, so that the data for calibration are more consistent with the actual working condition of the to-be-calibrated flowmeter, and the accuracy of calibration is improved.

[0082] Moreover, considering that the to-be-calibrated flowmeter may have different measurement errors at different mass flow points, the application can support acquisition of multiple sets of cumulative mass flow at different mass flow points, and then determine error values corresponding to the to-be-calibrated flowmeter at different mass flow points, to support accurate calibration of the to-be-calibrated flowmeter.

[0083] In an embodiment, the to-be-calibrated flowmeter has a display module for displaying cumulative mass flow. The first acquisition device is a camera device for acquiring image information of the display module. In this case, in the above S301, that is, when the control device acquires multiple sets of cumulative mass flow, the application embodiment provides an optional implementation manner, including: S3011-S3012.

[0084] S3011, determine a start mass flow based on a start image, and determine an end mass flow based on an end image.

[0085] The start image is an image acquired by the first acquisition device at the beginning of a collection period. The end image is an image acquired by the first acquisition device at the end of a collection period. That is, within a collection period corresponding to a mass flow point, the first acquisition device can acquire the start image and the end image respectively.

[0086] The control device can identify the start image and the end image respectively to determine the start mass flow and the end mass flow. The start mass flow is the cumulative mass flow measured by the to-be-calibrated flowmeter at the beginning of the collection period. The end mass flow is the cumulative mass flow measured by the to-be-calibrated flowmeter at the end of the collection period.

[0087] S3012, determine the difference between the end mass flow and the start mass flow as the first flow information.

[0088] The first flow information is the cumulative mass flow flowing through the standard table within a collection period.

[0089] In one embodiment, the second acquisition device is a frequency counter, configured to acquire the number of pulses. In this case, when the control device acquires the multiple sets of cumulative mass flow in S301, the present embodiment provides an optional implementation, comprising: S3013.

[0090] S3013, dividing the quotient of the number of pulses of the standard table and the pulse coefficient of the standard table to determine the second flow information.

[0091] The number of pulses of the standard table is the number of pulses measured by the second acquisition device in a collection period.

[0092] The control device can divide the number of pulses measured by the frequency counter in a collection period by the pulse coefficient of the standard table to obtain the second flow information, i.e., the cumulative mass flow through the standard table in a collection period.

[0093] In one embodiment, when the control device determines the error value corresponding to each mass flow point of the to-be-calibrated flowmeter according to the multiple sets of cumulative mass flow in S302, the present embodiment provides an optional implementation, comprising: S3021.

[0094] S3021, determining the error value corresponding to the one set of cumulative mass flow by dividing the difference between the second flow information and the first flow information in the one set of cumulative mass flow by the ratio of the first flow information in the one set of cumulative mass flow, to obtain the error value corresponding to each mass flow point of the to-be-calibrated flowmeter.

[0095] That is, for one set of cumulative mass flow, the control device can determine the error value of the mass flow point corresponding to the one set of cumulative mass flow by dividing the difference between the cumulative mass flow acquired by the standard table and the cumulative mass flow acquired by the to-be-calibrated flowmeter by the ratio of the first flow information in the one set of cumulative mass flow, to calibrate the to-be-calibrated flowmeter.

[0096] In one embodiment, when the control device determines the error value corresponding to each mass flow point of the to-be-calibrated flowmeter according to the multiple sets of cumulative mass flow in S302, the present embodiment provides another optional implementation, comprising: S3022.

[0097] S3022, determining the error value of one mass flow point corresponding to one set of cumulative mass flow according to the first formula and the one set of cumulative mass flow, to obtain the error value corresponding to each mass flow point of the to-be-calibrated flowmeter.

[0098] The first formula is:

[0099]

[0100] E is a preset calibrated error corresponding to a mass flow point. The preset calibrated error is an error expected to be reached after calibration of the low-temperature liquid flowmeter to be calibrated. y is second flow information in a set of cumulative mass flow. x is first flow information in the set of cumulative mass flow. k is an error value of a mass flow point. Based on this, the control device can calculate the error value of the mass flow point corresponding to the set of cumulative mass flow according to the first formula after obtaining the set of cumulative mass flow.

[0101] In an embodiment, the low-temperature liquid flowmeter calibration system can further include a pressure transmitter. The pressure transmitter can be arranged at the input end or the output end of the standard table to collect fluid pressure. In this case, the low-temperature liquid flowmeter calibration method provided by the application further includes:

[0102] S401, adjusting the second flow information according to the fluid temperature and the fluid pressure.

[0103] The fluid pressure is the pressure when the fluid flows through the standard table.

[0104] In order to improve the accuracy of calibration, the control device can calculate the density of the fluid under actual working conditions according to the fluid temperature and the fluid pressure, and then correct the cumulative mass flow collected by the standard table to obtain more accurate mass flow values, so as to determine more accurate error values.

[0105] The above mainly introduces the scheme of the embodiments of the application from the perspective of the method. It can be understood that the computer device contains at least one of the corresponding hardware structure and software module for implementing each function. Those skilled in the art should easily realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in the present application can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is driven by hardware or computer software to drive hardware depends on the specific application and design constraints of the technical scheme. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0106] The embodiments of the application can divide the functional units of the computer device according to the above method examples, for example, each functional unit can be divided according to each function, or two or more functions can be integrated in one processing unit. The integrated unit can be realized in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the application is illustrative, and is only a logical functional division. Actual implementation can have another division method.

[0107] Exemplarily, Figure 5A structural diagram of a low-temperature liquid flowmeter calibration device is shown. The low-temperature liquid flowmeter calibration device 30 can be applied to a control device in a low-temperature liquid flowmeter calibration system. The low-temperature liquid flowmeter calibration system further comprises a first acquisition device, a standard meter, a second acquisition device, and a temperature transmitter. The control device is connected with the first acquisition device and the second acquisition device respectively. The standard meter is connected in series with a flowmeter to be calibrated and a fluid device in operation. The fluid device is a device through which fluid flows in or out in an actual working scene of the flowmeter to be calibrated. The first acquisition device is configured to acquire first flow information measured by the flowmeter to be calibrated. The second acquisition device is configured to acquire second flow information measured by the standard meter. The temperature transmitter is configured to measure the temperature of fluid flowing through the standard meter. The low-temperature liquid flowmeter calibration device 30 comprises an acquisition unit 501 and a processing unit 502.

[0108] The acquisition unit 501 is configured to acquire a plurality of sets of cumulative mass flow rates when the second flow information and the temperature of the fluid meet a calibration condition. The calibration condition is used to limit the mass flow rate point at which the second flow information is located when calibration starts, and the temperature range in which the temperature of the fluid is located when calibration starts. One set of cumulative mass flow rates comprises one first flow information and one second flow information measured in the same acquisition period. Different sets of cumulative mass flow rates correspond to different mass flow rate points.

[0109] The processing unit 502 is configured to determine an error value of the flowmeter to be calibrated at each mass flow rate point according to the plurality of sets of cumulative mass flow rates, so as to calibrate the flowmeter to be calibrated.

[0110] In some embodiments, the acquisition unit 501 is specifically configured to determine a starting mass flow rate based on a starting image and determine a terminal mass flow rate based on a terminal image. The starting image is an image acquired by the first acquisition device at a starting time of an acquisition period. The terminal image is an image acquired by the first acquisition device at an ending time of the acquisition period. A difference between the terminal mass flow rate and the starting mass flow rate is determined as the first flow information.

[0111] In some embodiments, the acquisition unit 501 is specifically configured to determine a quotient of a number of pulses of the standard meter divided by a pulse coefficient of the standard meter as the second flow information. The number of pulses of the standard meter is a number of pulses measured by the standard meter and acquired by the second acquisition device in an acquisition period.

[0112] In some embodiments, the processing unit 502 is further configured to adjust the second flow information according to the temperature of the fluid and a fluid pressure. The fluid pressure is a pressure of the fluid flowing through the standard meter.

[0113] In some embodiments, the processing unit 502 is specifically configured to: determine, as an error value corresponding to the set of cumulative mass flow rates, a ratio of a difference between the second flow information and the first flow information in the set of cumulative mass flow rates and the first flow information in the set of cumulative mass flow rates.

[0114] In some embodiments, the fluid includes a liquid having a boiling point lower than -153℃ at normal pressure.

[0115] For specific description of the above-mentioned optional mode, refer to the foregoing method embodiments, which will not be repeated here. In addition, the description of the interpretation and beneficial effects of any one of the computer devices provided above can refer to the corresponding method embodiments described above, which will not be repeated here.

[0116] The embodiments of the present application also provide a readable storage medium, which stores a computer program. When the computer program runs on a control device, the control device executes the method performed by any one of the control devices provided above.

[0117] For the description of the interpretation and beneficial effects of related content in any one of the readable storage media provided above, refer to the corresponding embodiments described above, which will not be repeated here.

[0118] The embodiments of the present application also provide a computer program product containing instructions. When the instructions run on a control device, the control device executes any one of the methods in the above embodiments. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the control device, all or part of the processes or functions according to the embodiments of the present application are generated. The control device can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a readable storage medium or transferred from one readable storage medium to another readable storage medium, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The readable storage medium can be any available medium that the control device can access or a data storage device such as a server, data center, etc. containing one or more media that can be integrated. The available medium can be a magnetic medium (such as a floppy disk, a hard disk, a magnetic tape), an optical medium (such as a DVD), etc.

[0119] It should be noted that the above-mentioned devices for storing computer instructions or computer programs provided by the embodiments of the present application, such as but not limited to the above-mentioned memories, readable storage media, etc., are all non-transitory.

[0120] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of calibrating a cryogenic liquid flowmeter, the method comprising: A control device applied to a low-temperature liquid flowmeter calibration system; The low-temperature liquid flowmeter calibration system further comprises a first acquisition device, a standard meter, a second acquisition device, and a temperature transmitter; the control device is connected with the first acquisition device, the second acquisition device, and the temperature transmitter; the standard meter is connected in series with a flowmeter to be calibrated and a fluid device in operation; the fluid device is a device for fluid inflow or outflow in an actual working scene of the flowmeter to be calibrated; the first acquisition device is used to acquire first flow information measured by the flowmeter to be calibrated; the second acquisition device is used to acquire second flow information measured by the standard meter; and the temperature transmitter is used to measure the temperature of fluid flowing through the standard meter. The low-temperature liquid flowmeter calibration method comprises: In a case where the second flow information and the fluid temperature meet a calibration condition, a plurality of sets of cumulative mass flow rates are acquired; the calibration condition is used to limit the mass flow rate point at which the second flow information is located when calibration starts and the temperature interval at which the fluid temperature is located when calibration starts; one set of cumulative mass flow rates comprises one first flow information and one second flow information measured in a same acquisition period; different sets of cumulative mass flow rates correspond to different mass flow rate points; According to the plurality of sets of cumulative mass flow rates, error values corresponding to each mass flow rate point of the flowmeter to be calibrated are determined to calibrate the flowmeter to be calibrated.

2. The method of claim 1, wherein, The acquisition of the plurality of sets of cumulative mass flow rates comprises: A starting mass flow rate is determined based on a starting image, and a terminal mass flow rate is determined based on a terminal image; the starting image is an image acquired by the first acquisition device at a starting time of an acquisition period; and the terminal image is an image acquired by the first acquisition device at a terminal time of the acquisition period. A difference between the terminal mass flow rate and the starting mass flow rate is determined as the first flow information.

3. The method of claim 1, wherein, The acquisition of the plurality of sets of cumulative mass flow rates comprises: A quotient obtained by dividing a standard meter pulse number by a standard meter pulse coefficient is determined as the second flow information; the standard meter pulse number is a pulse number measured by the standard meter and acquired by the second acquisition device in an acquisition period.

4. The method of claim 3, wherein, The method further comprises: The second flow information is adjusted according to the fluid temperature and a fluid pressure; the fluid pressure is a pressure of the fluid flowing through the standard meter.

5. The method of claim 1, wherein, The determination of the error values corresponding to each mass flow rate point of the flowmeter to be calibrated according to the plurality of sets of cumulative mass flow rates comprises: A ratio of a difference between the second flow information and the first flow information in one set of cumulative mass flow rates to the first flow information in the set of cumulative mass flow rates is determined as an error value corresponding to the set of cumulative mass flow rates, to obtain the error values corresponding to each mass flow rate point of the flowmeter to be calibrated.

6. The method of claim 1, wherein, The fluid comprises a liquid with a boiling point lower than -153 DEG C under normal pressure.

7. A cryogenic liquid flowmeter calibration apparatus characterized by, A control device applied to a low-temperature liquid flowmeter calibration system; The low-temperature liquid flowmeter calibration system further comprises a first acquisition device, a standard meter, a second acquisition device, and a temperature transmitter; the control device is connected with the first acquisition device and the second acquisition device respectively; the standard meter is connected in series with the flowmeter to be calibrated and a fluid device in operation; the fluid device is a device for fluid inflow or outflow in the actual working scene of the flowmeter to be calibrated; the first acquisition device is used for acquiring first flow information measured by the flowmeter to be calibrated; the second acquisition device is used for acquiring second flow information measured by the standard meter; and the temperature transmitter is used for measuring the temperature of fluid flowing through the standard meter. The low-temperature liquid flowmeter calibration device comprises an acquisition unit and a processing unit. The acquisition unit is configured to acquire a plurality of sets of cumulative mass flow rates when the second flow information and the fluid temperature meet a calibration condition; the calibration condition is used to limit a mass flow rate point at which the second flow information is located when calibration starts and a temperature interval at which the fluid temperature is located when calibration starts; one set of cumulative mass flow rates comprises one first flow information and one second flow information measured in a same acquisition period; and different sets of cumulative mass flow rates correspond to different mass flow rate points. The processing unit is configured to determine an error value corresponding to each mass flow rate point of the flowmeter to be calibrated according to the plurality of sets of cumulative mass flow rates, so as to calibrate the flowmeter to be calibrated.

8. A computer device, comprising: A processor connected with a memory, the memory is used for storing computer execution instructions, the processor executes the computer execution instructions stored in the memory, so that the computer device executes the low-temperature liquid flowmeter calibration method according to any one of claims 1-6. A computer execution instruction for storing, when the computer execution instruction runs on a computer device, so that the computer device executes the low-temperature liquid flowmeter calibration method according to any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, A computer execution instruction for storing, when the computer execution instruction runs on a computer device, so that the computer device executes the low-temperature liquid flowmeter calibration method according to any one of claims 1-6.

10. A computer program product, characterised in that, ​

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