Flow measurement method

Abstract

The embodiment of the invention provides a flow measurement method, which is used for measuring the flow of a plurality of negative pressure pipelines in a formation negative pressure system, and comprises the following steps: determining the internal equivalent aperture of a first flowmeter; the other negative pressure pipelines except the negative pressure pipeline to be measured are respectively connected with a plug, and the aperture of the plug is equal to the internal equivalent aperture; and the flow of the to-be-measured negative pressure pipeline is measured through the first flow meter. According to the flow measurement method provided by the embodiment of the invention, the plurality of plugs are connected into other pipelines except the negative pressure pipeline to be measured, so that the pipe diameters of other negative pressure pipelines are the same as the internal equivalent aperture of the first flow meter. The pipe diameter difference between the to-be-measured negative pressure pipeline connected to the first flow meter and other negative pressure pipelines can be reduced, so that the difference between the flow passing through the to-be-measured negative pressure pipeline and the flow passing through other negative pressure pipelines is reduced, the accuracy of the test result of the first flow meter is improved, and the flow measurement accuracy of the negative pressure pipelines in the formation negative pressure system is improved.

Description

[0001] This application is a divisional application of the Chinese patent application with the invention name “A flow measurement method”, the application date is January 7, 2022, and the application number is “202210014577.2”. Technical Field

[0002] The present application relates to the field of electrochemical technology, and in particular to a flow measurement method. Background Art

[0003] This section merely provides background information related to the present application and is not necessarily prior art.

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles.

[0005] In related technologies, a formation negative pressure system is used to perform formation processing on batteries before they leave the factory to improve their safety performance. The formation negative pressure system has multiple negative pressure pipes, which are used to connect to the battery's injection holes to remove the gas generated during the battery charging process by pumping negative pressure. To determine whether the formation negative pressure system meets the battery's gas extraction requirements, it is necessary to measure the flow of multiple negative pressure pipes. However, current flow measurement methods are not accurate enough for measuring the flow of multiple negative pressure pipes. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a flow measurement method to improve the accuracy of flow measurement in a negative pressure pipeline in a formation negative pressure system. The specific technical solution is as follows: An embodiment of the first aspect of the present application provides a flow measurement method for measuring the flow of multiple negative pressure pipes in a negative pressure formation system, the method comprising: determining an internal equivalent aperture of the first flow meter; The negative pressure pipes other than the negative pressure pipe to be tested in the plurality of negative pressure pipes are respectively connected to plugs, wherein the aperture of the plugs is equal to the internal equivalent aperture; The flow rate of the negative pressure pipeline to be measured is measured by the first flow meter.

[0007] In the flow measurement method provided in the embodiment of the present application, a first flow meter is connected to a negative pressure pipeline to be measured, and then a plurality of plugs are used to connect the other negative pressure pipelines except the negative pressure pipeline to be measured in the plurality of negative pressure pipelines, so that the caliber of the other negative pressure pipelines is adjusted to be consistent with the aperture of the plurality of plugs, and then the flow value measured by the first flow meter is determined as the flow of the negative pressure pipeline to be measured. Wherein, since the aperture of the plurality of plugs is the same as the internal equivalent aperture of the first flow meter, the plurality of plugs are connected to the other pipelines except the negative pressure pipeline to be measured, so that the caliber of the other negative pressure pipelines is the same as the internal equivalent aperture of the first flow meter. Thus, the caliber difference between the negative pressure pipeline to be measured and the other negative pressure pipelines connected to the first flow meter can be reduced, thereby reducing the difference between the flow through the negative pressure pipeline to be measured and the flow through other negative pressure pipelines, thereby improving the accuracy of the test result of the first flow meter, and improving the accuracy of the flow measurement of the negative pressure pipeline in the negative pressure system.

[0008] In some embodiments, the step of determining the internal equivalent aperture of the first flow meter includes: Connecting a first flow meter to the first negative pressure pipeline; Acquire multiple plug groups with different pore diameters, wherein each plug group includes multiple plugs with the same pore diameter; Connecting the multiple plugs of any plug group to other negative pressure pipes except the first negative pressure pipe, respectively, to obtain a first flow value measured by a first flow meter; Removing a plug from the second negative pressure pipe and connecting a second flow meter to obtain a second flow value measured by the first flow meter after connecting the second flow meter, wherein the second flow meter is a flow meter equivalent to the first flow meter; The plug group is replaced according to the first flow value, the second flow value and the aperture of the plug group until the difference between the first flow value and the second flow value is within the first preset difference range, and the aperture of the current plug group is determined as the internal equivalent aperture of the first flowmeter.

[0009] In an embodiment of the present application, plug groups of different apertures are replaced according to changes in the flow rate in the first negative pressure pipe until the aperture of the plug group is equal to the internal equivalent aperture of the second flow meter, thereby obtaining the internal equivalent aperture of the second flow meter and the first flow meter. This does not require the use of a large number of measuring devices, is simple to operate, and produces highly accurate results.

[0010] In some embodiments, the step of replacing the plug assembly according to the first flow rate value, the second flow rate value, and the aperture of the plug assembly until the difference between the first flow rate value and the second flow rate value is within a first preset difference range includes: The plug group is replaced according to the first flow value, the second flow value and the aperture of the plug group until the first flow value is equal to the second flow value.

[0011] In the embodiment of the present application, the difference between the first flow value and the second flow value is 0, and the flow in the first negative pressure pipe does not change. It can be determined that the aperture of the current plug is equal to the internal equivalent aperture of the second flow meter and the first flow meter, making the internal equivalent aperture of the first flow meter more accurate, which can further improve the accuracy of flow measurement in the negative pressure pipe in the negative pressure system.

[0012] In some embodiments, the first preset difference range is -0.2 to 0.2.

[0013] In some embodiments, the step of replacing the plug assembly according to the first flow rate value, the second flow rate value, and the aperture of the plug assembly includes: If the second flow rate value is greater than the first flow rate value, the plug set is replaced with the first plug set, wherein the aperture of the first plug set is smaller than the aperture of the plug set; If the second flow rate value is smaller than the first flow rate value, the plug group is replaced with a second plug group, wherein the aperture of the second plug group is larger than the aperture of the plug group.

[0014] In this embodiment, the current plug set is replaced with a first plug set or a second plug set having an aperture closer to the internal equivalent aperture of the second flow meter until the difference between the first flow rate value and the second flow rate value falls within a first preset difference range, thereby determining that the aperture of the current plug set is equal to the internal equivalent aperture of the first flow meter and the second flow meter. This operation is simple and the results are highly accurate.

[0015] In some embodiments, the first flow meter and / or the second flow meter is an adjustable flow meter, thereby facilitating adjustment of the internal resistance of the first flow meter or the second flow meter to make the first flow meter and the second flow meter equivalent.

[0016] In some embodiments, before connecting the first flow meter to the first negative pressure pipe, the method further includes: Connecting a first flow meter to the third negative pressure pipe to obtain a third flow value measured by the first flow meter; replacing the first flow meter with a second flow meter to obtain a fourth flow value measured by the second flow meter; The flow valve of the second flow meter and / or the first flow meter is adjusted until the difference between the fourth flow value and the third flow value is within a second preset difference range.

[0017] In an embodiment of the present application, when the difference between the third flow value and the fourth flow value is within the second preset difference range, it means that the difference between the internal equivalent apertures of the first flow meter and the second flow meter is small, so it can be determined that the first flow meter is equivalent to the second flow meter.

[0018] In some embodiments, the step of adjusting the flow valve of the second flow meter and / or the first flow meter until the difference between the fourth flow value and the third flow value is within a second preset difference range includes: The flow valve of the second flow meter and / or the first flow meter is adjusted until the third flow value is equal to the fourth flow value.

[0019] In an embodiment of the present application, the third flow value and the fourth flow value are adjusted to be equal, that is, the internal resistance and the internal equivalent aperture of the first flow meter and the second flow meter are equal, and the first flow meter and the second flow meter are equivalent, thereby further improving the accuracy of the test results of the first flow meter and improving the accuracy of the flow measurement of the negative pressure pipeline in the negative pressure system.

[0020] In some embodiments, the second preset difference range is -0.2 to 0.2.

[0021] Of course, it is not necessary to achieve all of the advantages described above simultaneously when implementing any product or method of this application. The above description is only an overview of the technical solution of this application. In order to more clearly understand the technical means of this application, it can be implemented in accordance with the contents of the description. In order to make the above and other purposes, features and advantages of this application more obvious and easy to understand, the following specifically describes the specific implementation methods of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0023] Figure 1 A schematic structural diagram of a vehicle in some embodiments of the present application; Figure 2 A schematic structural diagram of a battery in some embodiments of the present application; Figure 3 A flow chart of a flow measurement method in some embodiments of the present application; Figure 4 A flow chart of a method for determining an internal equivalent aperture of a first flow meter in some embodiments of the present application; Figure 5 Another flow chart of a method for determining an internal equivalent aperture of a first flow meter in some embodiments of the present application; Figure 6 A partial flow chart of a method for determining an internal equivalent aperture of a first flow meter in some embodiments of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0025] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0026] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0027] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "below," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" may include both above and below orientations. The device may be oriented otherwise, such as rotated 90 degrees or in other orientations, and the spatially relative descriptors used herein are interpreted accordingly.

[0028] In the related art, the formation negative pressure system is used to perform formation treatment on the battery. The formation negative pressure system includes multiple negative pressure pipes. For example, one storage location of the formation negative pressure system may include 32 pipes or 24 pipes. The negative pressure pipe is used to connect to the liquid filling port of the battery to remove the gas generated during the battery charging process by pumping negative pressure. The flow rate of the gas is used to determine whether the battery meets the safety standards. In addition, in order to determine whether the formation negative pressure system meets the gas extraction requirements of the battery, it is necessary to measure the flow of multiple negative pressure pipes.

[0029] In related art, to detect the flow rate in each negative pressure pipe, a flow meter is connected to each pipe. Then, negative pressure is simultaneously applied to multiple negative pressure pipes, and the flow rate value of each negative pressure pipe is determined based on the flow rate values ​​measured by the multiple flow meters. However, using multiple flow meters simultaneously for measurement is cumbersome and expensive.

[0030] To reduce measurement costs, the flow rate of each negative pressure pipe can also be tested separately using a flow meter. However, since the flow meter is connected to the negative pressure pipe, the diameter of the negative pressure pipe will change, thereby affecting the gas flow through the pipe diameter, resulting in inaccurate measurement results of the flow meter. For example, if the connection of the flow meter changes the aperture of the negative pressure pipe to 0.3mm, while the diameter of other negative pressure pipes is 0.5mm, when negative pressure is pumped into multiple negative pressure pipes, more gas will flow through the negative pressure pipe with a larger diameter, resulting in a smaller flow rate through the pipe to be tested, making the flow value measured by the flow meter smaller, affecting the accuracy of the flow measurement.

[0031] In order to solve the above problems, the inventors have designed a flow measurement method after in-depth research, namely the flow measurement method provided in the present application, in which multiple plugs with the same aperture as the internal equivalent aperture of the first flowmeter are respectively connected to other negative pressure pipes except the negative pressure pipe to be measured, and then the first flowmeter is used to measure the flow of the negative pressure pipe to be measured. This can reduce the influence of the first flowmeter on the pipe diameter of the negative pressure pipe to be measured, thereby improving the accuracy of the measurement results of the first flowmeter and improving the accuracy of the flow measurement of the negative pressure pipe in the negative pressure system.

[0032] The flow rate testing method provided in the embodiment of the present application is used to test the flow of the formation negative pressure system, and the formation negative pressure system is used to form a battery. Wherein, the battery can be used as a power source for an electrical device. The electrical device can be a mobile phone, a portable device, a laptop computer, a battery car, an electric car, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, a spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc., an electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc., an electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer.

[0033] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0034] The battery described in the embodiments of the present application is not limited to being applicable to the electrical devices described above, but can also be applied to all devices that use batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0035] For example, see Figure 1 Vehicle 1 can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Vehicle 1 can be equipped with a battery 3, a controller 4, and a motor 2. Controller 4 is used to control the battery 3 to power motor 2. For example, battery 3 can be located at the bottom, front, or rear of vehicle 1. Battery 3 can be used to power vehicle 1. For example, battery 3 can serve as an operating power source for vehicle 1 and is used in vehicle 1's circuit system, such as for starting, navigation, and operating power requirements of vehicle 1.

[0036] In addition, the battery 3 mentioned in the embodiment of the application can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0037] Please refer to Figure 2The battery 3 mentioned in the embodiment of the present application may include a battery cell 31 and a battery housing 32. The battery cell 31 is housed within the battery housing 32. The battery housing 32 may include an upper housing 321 and a lower housing 322. The upper housing 321 and the lower housing 322 are fixedly connected to form a housing space. In the battery 3, there may be multiple battery cells 31. The multiple battery cells 31 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 31 being connected in both series and parallel configurations. The multiple battery cells 31 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 31 is housed within the battery housing 32. Of course, the battery 3 may also be formed by first connecting multiple battery cells 31 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the battery housing 32. The battery 3 may also include other structures. For example, the battery 3 may include a busbar component for electrically connecting the multiple battery cells 31. For example, multiple battery cells 31 may be connected in parallel, in series, or in a hybrid configuration. Specifically, the busbar assembly can electrically connect the battery cells 31 by connecting to the electrode terminals of the battery cells 31. Furthermore, the busbar assembly can be fixedly connected to the electrode terminals of the battery cells 31 by welding. Optionally, the busbar assembly can include a conductive mechanism, through which the electrical energy generated by the multiple battery cells 31 can be further led out through the battery cells 31.

[0038] Each battery cell 31 can be a secondary battery or a primary battery. It can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 31 can be cylindrical, flat, rectangular, or in other shapes.

[0039] The embodiment of the first aspect of the present application provides a flow testing method for measuring the flow of multiple negative pressure pipes in a negative pressure system. Figure 3 As shown, the flow testing method includes the following steps.

[0040] Step S301: Determine the internal equivalent aperture of the first flow meter.

[0041] In an embodiment of the present application, the first flowmeter is a device for measuring the volume of flow rates of gas, liquid, etc. The internal equivalent aperture of the first flowmeter is related to the resistance inside the first flowmeter. When the first flowmeter is connected to the negative pressure pipeline to be measured, the internal equivalent aperture of the first flowmeter will affect the diameter of the negative pressure pipeline to be measured, such as making the diameter of the negative pressure pipeline to be measured roughly equal to the internal equivalent aperture of the first flowmeter. Among them, the first flowmeter can be a volumetric flowmeter, an impulse flowmeter, a momentum flowmeter, an electromagnetic flowmeter, an ultrasonic flowmeter, etc., and this application does not limit this. The first flowmeter can be a fixed flowmeter or an adjustable flowmeter.

[0042] Step S302 : plugs are respectively connected to the negative pressure pipes other than the negative pressure pipe to be tested among the multiple negative pressure pipes, and the aperture of the plugs is equal to the internal equivalent aperture.

[0043] In the embodiment of the present application, the plug is a device provided at the port of the negative pressure pipe to change the diameter of the negative pressure pipe, thereby changing the flow rate of the negative pressure pipe. By connecting the plug to other pipes except the negative pressure pipe to be measured, the diameter of the other negative pressure pipes can be changed to the aperture of the plug. Therefore, by using a plug with the same aperture as the internal equivalent aperture of the first flowmeter, the diameter of the other negative pressure pipes can be made roughly the same as the internal equivalent aperture of the first flowmeter. Among them, the number of negative pressure pipes to be measured can be set according to actual needs, such as being set according to the number of first flowmeters, etc., and this application does not make specific restrictions on this. Among them, the negative pressure system also includes a negative pressure cup, which is used to store the electrolyte flowing out during the process of pumping gas from the battery. The diameter of the negative pressure pipe is the inner diameter of the cup stem of the negative pressure cup.

[0044] Step S303: measuring the flow rate of the negative pressure pipeline to be measured by using a first flow meter.

[0045] In the embodiment of the present application, after the first flow meter is connected to the negative pressure pipeline to be tested and negative pressure is pumped into multiple negative pressure pipelines, the first flow meter can measure and display the flow of the pipeline to be tested connected thereto.

[0046] In the flow measurement method provided in the embodiment of the present application, a first flow meter is connected to a negative pressure pipeline to be measured, and then a plurality of plugs are used to connect the other negative pressure pipelines except the negative pressure pipeline to be measured in the plurality of negative pressure pipelines, so that the caliber of the other negative pressure pipelines is adjusted to be consistent with the aperture of the plurality of plugs, and then the flow value measured by the first flow meter is determined as the flow of the negative pressure pipeline to be measured. Wherein, since the aperture of the plurality of plugs is the same as the internal equivalent aperture of the first flow meter, the plurality of plugs are connected to the other pipelines except the negative pressure pipeline to be measured, so that the caliber of the other negative pressure pipelines is the same as the internal equivalent aperture of the first flow meter. Thus, the caliber difference between the negative pressure pipeline to be measured and the other negative pressure pipelines connected to the first flow meter can be reduced, thereby reducing the difference between the flow through the negative pressure pipeline to be measured and the flow through other negative pressure pipelines, thereby improving the accuracy of the test result of the first flow meter, and improving the accuracy of the flow measurement of the negative pressure pipeline in the negative pressure system.

[0047] In some embodiments, such as Figure 4 As shown, the internal equivalent aperture of the first flow meter can be determined by the following steps.

[0048] Step S401: Connect a first flow meter to a first negative pressure pipe.

[0049] In the embodiment of the present application, the first negative pressure pipeline is any one of the multiple negative pressure pipelines included in the negative pressure system.

[0050] Step S402 : obtaining a plurality of plug groups with different apertures, wherein each plug group includes a plurality of plugs with the same aperture.

[0051] In an embodiment of the present application, each plug group includes multiple plugs, and the number of the multiple plugs can correspond to the number of multiple negative pressure pipes in the negative pressure pipe. The aperture of the plug group is the aperture of the multiple plugs included in the plug group. The apertures of the multiple plugs in each plug group are the same, and the apertures of the multiple plugs can be set according to actual needs. For example, the aperture can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc. The number of multiple plug groups can also be set according to actual needs, such as setting it according to the required range of aperture, etc., and this application does not make specific restrictions on this. For example, the number of multiple plug groups can be 8 groups, 9 groups, 10 groups, etc.

[0052] Step S403: Connect the multiple plugs of any plug group to other negative pressure pipes except the first negative pressure pipe, and obtain a first flow value measured by a first flow meter.

[0053] In the embodiment of the present application, each plug group includes multiple plugs, and one plug is connected to each negative pressure pipe in the other negative pressure pipes. Because the multiple plugs in each plug group have the same aperture, the diameters of the other negative pressure pipes after the multiple plugs are connected are also the same, and therefore the flow rates of the other negative pressure pipes are also approximately the same. After the other negative pressure pipes are connected to the plugs with the same aperture, the first flow value measured by the first flowmeter is determined as the flow value corresponding to the plug group.

[0054] Among them, any plug group can be a plug group randomly selected from multiple plug groups. Further, any plug group can also be selected based on the pore size of the plug group. For example, any plug group can be the plug group with the largest pore size or the plug group with the smallest pore size among the multiple plug groups. This application does not limit this.

[0055] Step S404: remove the plug in the second negative pressure pipe and connect a second flow meter to obtain a second flow value measured by the first flow meter after connecting the second flow meter, wherein the second flow meter is a flow meter equivalent to the first flow meter.

[0056] In the embodiment of the present application, the second flowmeter is also a volume measuring device for the flow of gas, liquid, etc. The equivalence of the first flowmeter and the second flowmeter can be understood as that the internal resistance of the first flowmeter and the second flowmeter are the same. Among them, the second flow value is the flow value measured by the first flowmeter after replacing the plug of any negative pressure pipeline with the second flowmeter. Therefore, the influence of the second flowmeter on the flow in the negative pressure pipeline to be measured can be determined based on the difference between the first flow value and the second flow value. Among them, the second flowmeter can be a fixed flowmeter or an adjustable flowmeter.

[0057] In some embodiments, the first flow meter and / or the second flow meter is an adjustable flow meter.

[0058] In an embodiment of the present application, the adjustable flowmeter can adjust the internal resistance, and at least one of the first flowmeter and the second flowmeter is an adjustable flowmeter to facilitate adjusting the internal resistance of the first flowmeter or the second flowmeter to make the first flowmeter and the second flowmeter equivalent.

[0059] In some embodiments, in order to make the first flow meter and the second flow meter equivalent, the first flow meter and the second flow meter can be flow meters with exactly the same model and structure.

[0060] In some embodiments, such as Figure 5 As shown, before step S401, the flow rate testing method provided in the embodiment of the present application further includes: Step S406: Connect a first flow meter to the third negative pressure pipe to obtain a third flow value measured by the first flow meter.

[0061] In the embodiment of the present application, the third negative pressure pipe can be any negative pressure pipe in the forming negative pressure system. A first flow meter is connected to the third negative pressure pipe, and the other negative pressure pipes except the third negative pressure pipe are suspended in the air. The third flow value measured by the first flow meter is determined as the flow value of the third negative pressure pipe.

[0062] Step S407: Replace the first flow meter with a second flow meter to obtain a fourth flow value measured by the second flow meter.

[0063] In an embodiment of the present application, after obtaining the third flow value, the first flow meter is removed from the third negative pressure pipe, and then the second flow meter is connected to the third negative pressure pipe, while the other negative pressure pipes except the third negative pressure pipe are still suspended in the air, and the fourth flow value measured by the second flow meter is determined as the flow value of the third negative pressure pipe.

[0064] Among them, when measuring the flow of the third negative pressure pipeline through the first flowmeter and the second flowmeter, since the internal resistance and internal equivalent aperture of the first flowmeter and the second flowmeter may be different, the diameter change of the third negative pressure pipeline connected to the first flowmeter and the second flowmeter is also different, resulting in different flows in the third negative pressure pipeline connected to the first flowmeter and the second flowmeter, so the measured third flow value and the fourth flow value may be different. In addition, since when the first flowmeter and the second flowmeter are connected to the third negative pressure pipeline, the other negative pressure pipelines except the third negative pressure pipeline are in a suspended state, that is, the effects of the other negative pressure pipelines on the third flow value and the fourth flow value are roughly the same, so based on the difference between the third flow value and the fourth flow value corresponding to the internal resistance and internal equivalent aperture of the first flowmeter and the second flowmeter, the first flowmeter or the second flowmeter can be adjusted by the third flow value and the fourth flow value to make the first flowmeter or the second flowmeter equivalent.

[0065] Step S408: Adjust the flow valve of the second flow meter and / or the first flow meter until the difference between the fourth flow value and the third flow value is within a second preset difference range.

[0066] In the embodiment of the present application, the difference between the fourth flow value and the third flow value corresponds to the difference between the internal equivalent apertures of the first flow meter and the second flow meter. The internal resistance and internal equivalent aperture of the first flow meter or the second flow meter can be changed by adjusting the flow valves of the second flow meter and the first flow meter. For example, when the third flow value is less than the fourth flow value, it means that compared with when the first flow meter is connected to the third negative pressure pipeline, the flow of the third negative pressure pipeline increases when the second flow meter is connected to the third negative pressure pipeline, that is, the diameter of the third negative pressure pipeline increases when the second flow meter is connected to the third negative pressure pipeline, so the internal resistance of the second flow meter is less than the internal resistance of the first flow meter, and the internal equivalent aperture of the second flow meter is larger than the internal equivalent aperture of the first flow meter. At this time, the internal resistance of the second flow meter can be increased or the internal resistance of the first flow meter can be reduced by the flow valve, so that the first flow meter and the second flow meter are equivalent.

[0067] Correspondingly, when the third flow value is greater than the fourth flow value, it means that compared with when the first flow meter is connected to the third negative pressure pipe, the flow of the third negative pressure pipe is reduced when the second flow meter is connected to the third negative pressure pipe, that is, the diameter of the third negative pressure pipe is reduced when the second flow meter is connected to the third negative pressure pipe. Therefore, the internal resistance of the second flow meter is greater than the internal resistance of the first flow meter, and the internal equivalent aperture of the second flow meter is smaller than the internal equivalent aperture of the first flow meter. At this time, the internal resistance of the second flow meter can be reduced or the internal resistance of the first flow meter can be increased through the flow valve, so that the first flow meter and the second flow meter are equivalent.

[0068] In the embodiment of the present application, when the difference between the third flow rate value and the fourth flow rate value is within a second preset difference range, it indicates that the difference between the internal equivalent apertures of the first flow meter and the second flow meter is small, and therefore the first flow meter and the second flow meter can be determined to be equivalent. The second preset difference range can be set based on actual conditions, such as the measurement accuracy of the first flow meter and the second flow meter, and is not specifically limited in this application.

[0069] In some embodiments, the second preset difference range is -0.2 to 0.2.

[0070] In the embodiment of the present application, if the third flow value is 1.2 and the fourth flow value is 1.6, the fourth flow value can be adjusted to 1.0 to 1.4 using the flow valve of the second flow meter, making the first flow meter equivalent to the second flow meter. Alternatively, the third flow value can be adjusted to 1.4 to 1.8 using the flow valve of the first flow meter, making the first flow meter equivalent to the second flow meter.

[0071] In some embodiments, step S408 may be further refined as follows: adjusting a flow valve of the second flow meter until the third flow value is equal to the fourth flow value.

[0072] In the embodiment of the present application, still taking the third flow value as 1.2 and the fourth flow value as 1.6 as an example, the fourth flow value can be adjusted to 1.2 by the flow valve of the second flow meter, so that the first flow meter is equivalent to the second flow meter. Alternatively, the third flow value can be adjusted to 1.6 by the flow valve of the first flow meter, so that the first flow meter is equivalent to the second flow meter. The third flow value and the fourth flow value are adjusted to be equal, that is, the internal resistance and the internal equivalent aperture of the first flow meter and the second flow meter are equal, and the first flow meter and the second flow meter are equivalent, further improving the accuracy of the test results of the first flow meter, and improving the accuracy of the flow measurement of the negative pressure pipeline in the negative pressure system.

[0073] In an embodiment of the present application, the internal resistance and internal equivalent aperture of the first flowmeter and the second flowmeter are adjusted by adjusting the flow values ​​of the same negative pressure pipeline measured by the first flowmeter and the second flowmeter, so that the first flowmeter and the second flowmeter are equivalent, and the internal equivalent apertures of the first flowmeter and the second flowmeter are roughly the same, thereby reducing the influence of structure and process on the first flowmeter and the second flowmeter. Step S405: Replace the plug group according to the first flow value, the second flow value and the aperture of the plug group until the difference between the first flow value and the second flow value is within the first preset difference range, and determine the aperture of the current plug group as the internal equivalent aperture of the first flowmeter.

[0074] In the embodiment of the present application, the first flow value is the flow value measured by the first flow meter before the second flow meter is connected; the second flow value is the flow value measured by the first flow meter after the second flow meter is connected. After obtaining the first flow value and the second flow value, based on the difference between the first flow value and the second flow value, that is, based on the flow change in the first negative pressure pipeline before and after the two flow meters are connected, the relationship between the internal equivalent aperture of the second flow meter and the aperture of the plug it replaces can be determined. Since the first flow meter is equivalent to the second flow meter, the relationship between the internal aperture of the first flow meter and the aperture of the plug can be determined.

[0075] Specifically, the first plug group of the current plug group is set, the plug of the second negative pressure pipe is replaced with the second flow meter, and the second flow value measured by the first flow meter at this time is obtained. If the reading of the first flow meter changes before and after the second flow meter is connected, and the change value is greater than the first preset difference interval, it means that after the plug in the second negative pressure pipe is replaced with the second flow meter, the pipe diameter and flow of the second negative pressure pipe have changed, thereby causing the flow in the first negative pressure pipe to change. Based on this, the first plug group can be changed to the second plug group according to the change of the flow in the first negative pressure pipe, and the aperture of the first plug group is different from the aperture of the second plug group. Then repeat the above steps S404 and S405 until the difference between the first flow value and the second flow value is within the first preset difference interval, that is, when the change value of the flow in the first negative pressure pipe before and after the second flow meter is connected is within the first preset difference interval, it can be determined that after the plug in the second negative pressure pipe is replaced with the second flow meter, the flow in the second negative pressure pipe changes little or almost unchanged. That is, the aperture of the current plug group is nearly equal to the internal equivalent aperture of the second flowmeter. Therefore, it can be determined that the aperture of the current plug group is also nearly equal to the internal equivalent aperture of the first flowmeter. Therefore, the aperture of the current plug group is determined to be the internal equivalent aperture of the first flowmeter. The second preset difference interval can be set based on actual conditions, such as the measurement accuracy of the first and second flowmeters, and this application does not impose specific limitations on this.

[0076] In some embodiments, the first preset difference range is -0.2 to 0.2.

[0077] In an embodiment of the present application, if the first flow value is 1, when the second flow meter is used to replace the plug in the second negative pressure pipe, the first flow value changes to 0.8 to 1.2, and it is determined that the aperture of the current plug group is almost equal to the internal equivalent aperture of the first flow meter and the second flow meter.

[0078] In some embodiments, step S405 can be refined as follows: replacing the plug group according to the first flow value, the second flow value, and the aperture of the plug group until the first flow value is equal to the second flow value. That is, after the plug in the second negative pressure pipeline is replaced with the second flow meter, the flow in the second negative pressure pipeline does not change, and therefore the flow in the first negative pressure pipeline does not change, and the difference between the first flow value and the second flow value is 0. Thus, it can be determined that the aperture of the current plug is equal to the internal equivalent aperture of the second flow meter and the first flow meter, making the internal equivalent aperture of the first flow meter more accurate, which can further improve the accuracy of flow measurement of the negative pressure pipeline in the negative pressure system.

[0079] In the embodiment of the present application, the equivalent aperture of the first flowmeter is measured by an equivalent first flowmeter and a second flowmeter. According to the change in the flow rate in the first negative pressure pipe before and after the second negative pressure pipe is connected to the second flowmeter, the size relationship between the aperture of the second flowmeter and the current plug group can be determined. Then, according to the change in the flow rate in the first negative pressure pipe, plug groups of different apertures are replaced until the aperture of the plug group is equal to the internal equivalent aperture of the second flowmeter, thereby obtaining the internal equivalent aperture of the second flowmeter and the first flowmeter. In the above method for determining the internal equivalent aperture of the first flowmeter, there is no need to use a large number of measuring devices, the operation is simple, and the result is highly accurate.

[0080] In some embodiments, such as Figure 6 As shown, step S405 can be further refined into the following steps.

[0081] Step S601: If the second flow rate value is greater than the first flow rate value, the plug group is replaced with the first plug group, wherein the aperture of the first plug group is smaller than the aperture of the plug group.

[0082] In the embodiment of the present application, if the second flow value is greater than the first flow value, it means that after the current plug of the second negative pressure pipeline is replaced with the second flow meter, the diameter of the second negative pressure pipeline is reduced. That is, when the plugs of other negative pressure pipelines remain unchanged, the diameter of the second negative pressure pipeline is reduced, so that the flow rate in the second negative pressure pipeline is reduced, thereby increasing the flow rate in the first negative pressure pipeline, and the second flow value is greater than the first flow value. Therefore, the internal equivalent diameter of the second flow meter is smaller than the aperture of the current plug group. Therefore, in order to make the aperture of the plug group closer to the internal equivalent aperture of the second flow meter, the aperture of the plug group needs to be reduced, so the first plug group with a smaller aperture is selected.

[0083] Step S602: If the second flow rate value is smaller than the first flow rate value, the plug set is replaced with a second plug set, wherein the aperture of the second plug set is larger than the aperture of the plug set.

[0084] In the embodiment of the present application, if the second flow value is less than the first flow value, it means that after the current plug of the second negative pressure pipeline is replaced with the second flow meter, the diameter of the second negative pressure pipeline increases. That is, when the plugs of other negative pressure pipelines remain unchanged, the diameter of the second negative pressure pipeline increases, so that the flow rate in the second negative pressure pipeline increases, thereby reducing the flow rate in the first negative pressure pipeline, and the second flow value is greater than the first flow value. Therefore, the internal equivalent diameter of the second flow meter is larger than the aperture of the current plug group. Therefore, in order to make the aperture of the plug group closer to the internal equivalent aperture of the second flow meter, the aperture of the plug group needs to be increased, so the second plug group with a larger aperture is selected.

[0085] In the embodiment of the present application, by comparing the first flow rate value and the second flow rate value, the flow rate change of the second negative pressure pipeline after being connected to the second flow meter can be determined, thereby determining the relationship between the internal equivalent aperture of the second flow meter and the aperture of the currently selected plug group. The current plug group is then replaced with a first plug group or a second plug group with an aperture closer to the internal equivalent aperture of the second flow meter, until the difference between the first flow rate value and the second flow rate value falls within a first preset difference range, thereby determining that the aperture of the current plug group is equal to the internal equivalent aperture of the first flow meter and the second flow meter. The operation is simple and the results are highly accurate.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments of the present application, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A flow measurement method for measuring the flow of multiple negative pressure pipes in a negative pressure formation system, characterized in that: The method comprises: determining an internal equivalent aperture of the first flow meter; Connecting plugs to the other negative pressure pipes except the negative pressure pipe to be measured among the multiple negative pressure pipes, respectively, wherein the aperture of the plugs is equal to the internal equivalent aperture, so that the diameter of the other negative pressure pipes is the same as the internal equivalent aperture of the first flow meter; The flow rate of the negative pressure pipeline to be measured is measured by the first flow meter.

2. The flow measurement method according to claim 1, characterized in that: The step of determining the internal equivalent aperture of the first flow meter comprises: Connecting the first flow meter to the first negative pressure pipeline; Acquire multiple plug groups with different pore diameters, wherein each plug group includes multiple plugs with the same pore diameter; Connecting the multiple plugs of any plug group to other negative pressure pipes except the first negative pressure pipe, respectively, to obtain a first flow value measured by the first flow meter; Removing a plug from the second negative pressure pipe and connecting a second flow meter to obtain a second flow value measured by the first flow meter after connecting the second flow meter, wherein the second flow meter is a flow meter equivalent to the first flow meter; The plug group is replaced according to the first flow value, the second flow value and the aperture of the plug group until the difference between the first flow value and the second flow value is within a first preset difference range, and the aperture of the current plug group is determined as the internal equivalent aperture of the first flow meter.

3. The flow measurement method according to claim 2, characterized in that: The step of replacing the plug group according to the first flow value, the second flow value, and the aperture of the plug group until the difference between the first flow value and the second flow value is within a first preset difference range includes: The plug group is replaced according to the first flow value, the second flow value and the aperture of the plug group until the first flow value is equal to the second flow value.

4. The flow measurement method according to claim 2, characterized in that: The step of replacing the plug group according to the first flow value, the second flow value and the aperture of the plug group includes: If the second flow rate value is greater than the first flow rate value, the plug set is replaced with a first plug set, wherein the aperture of the first plug set is smaller than the aperture of the plug set; If the second flow rate value is smaller than the first flow rate value, the plug group is replaced with a second plug group, wherein the aperture of the second plug group is larger than the aperture of the first plug group.

5. The flow measurement method according to claim 2, characterized in that: The first flow meter and / or the second flow meter is an adjustable flow meter.

6. The flow measurement method according to claim 5, characterized in that: Before connecting the first flow meter to the first negative pressure pipeline, the method further includes: Connecting the first flow meter to the third negative pressure pipe to obtain a third flow value measured by the first flow meter; replacing the first flow meter with the second flow meter to obtain a fourth flow value measured by the second flow meter; The flow valve of the second flow meter and / or the first flow meter is adjusted until the difference between the fourth flow value and the third flow value is within a second preset difference range.

7. The flow measurement method according to claim 6, characterized in that: The step of adjusting the flow valve of the second flow meter and / or the first flow meter until the difference between the fourth flow value and the third flow value is within a second preset difference range includes: If the third flow value is less than the fourth flow value, increasing the internal resistance of the second flow meter or decreasing the internal resistance of the first flow meter by adjusting the flow valve; If the third flow value is greater than the fourth flow value, the internal resistance of the second flow meter is reduced or the internal resistance of the first flow meter is increased by adjusting the flow valve.

8. The flow measurement method according to claim 6, characterized in that: The step of adjusting the flow valve of the second flow meter and / or the first flow meter until the difference between the fourth flow value and the third flow value is within a second preset difference range includes: Adjust the flow valve of the second flow meter and / or the first flow meter until the third flow value is equal to the fourth flow value.

9. The flow measurement method according to claim 6, characterized in that: The second preset difference interval is the same as the first preset difference interval.

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